JP6021440B2 - Cell module - Google Patents

Description

  The present invention relates to a cell module having an electrode part connection structure suitable for connecting a plurality of batteries in series.

  Conventionally, a cell module configured by connecting a plurality of batteries in series has been known as a power source capable of obtaining a high output. Such a cell module is used in a state where a plurality of batteries are arranged so that different polar parts of adjacent batteries are electrically connected, and these batteries are constrained in the arrangement direction. Therefore, in the case of a cell module in which different polar parts of adjacent batteries are in direct contact and are electrically connected, there is a possibility that the electrode part may be damaged or deformed due to a load of restraint. Therefore, various measures for protecting the electrode portion from the restraining load have been taken (see Patent Document 1).

  Patent Document 1 discloses a configuration of a battery having a connection structure in which adjacent batteries and electrode portions are not in direct contact with each other and are electrically connected via an elastic conductor. In this case, the battery is provided with an annular rim portion so as to surround one of the electrode portions (tip electrode portion), and an elastic conductor fixed to the tip electrode portion is provided in the central recess of the annular rim portion. It is arranged. And the battery is restrained in the state which made the cyclic | annular rim | limb part contact the other electrode part (terminal electrode part) of the adjacent battery. Thereby, it is avoided that a restraint load is directly loaded between the electrode parts of the adjacent batteries, and the electrode parts are protected.

JP 2007-273482 A

  On the other hand, in the connection structure of the electrode part disclosed in Patent Document 1, when it is desired to check the performance of each battery in the battery series connection body (cell module) or the load using the battery series connection body as a power source There is a problem that no consideration is given to the maintenance of circuits. For example, Patent Document 1 discloses a configuration of a portable light including a battery having the above-described electrode portion connection structure. In the case of such a portable light, a screw cap at one end of a cylindrical case is removed. Then, the battery is unconstrained and all the batteries can be easily taken out from the cylindrical case. For this reason, the performance of each battery can be confirmed safely. However, the pressing means for restraining the plurality of batteries is not limited to a detachable one such as a screw cap. Therefore, in a cell module that does not have a structure in which the pressing means can be easily removed, it may not be easy to safely remove individual batteries or arbitrary batteries. In particular, when the number of batteries is large, the circuit voltage becomes high, so it is necessary to consider safety.

  The present invention has been made based on this, and the problem to be solved is that it is possible to safely perform maintenance and inspection of each battery of a cell module formed by connecting a plurality of batteries in series and the load of the cell module. It is to realize a connection structure of the electrode part.

  In order to solve the above problems, the cell module according to the present invention is configured by connecting a plurality of batteries in series and restraining the plurality of batteries in a connection direction. In such a cell module, the battery is provided on a buffer portion that covers a surface portion on one side in the connection direction and cushions a restraining load in the connection direction, and a surface portion on one side in the connection direction, and the connection direction A recess recessed from the buffer portion, one electrode portion exposed from the recess to one side in the connection direction, the other electrode portion exposed on the other surface portion in the connection direction, A spring part for receiving the one electrode part and the other electrode part of the battery adjacent to the connection direction and electrically connecting to the adjacent battery; The recess has an opening communicating with the outside in a direction orthogonal to the connection direction.

In such a cell module, the spring portion may be configured to have a voltage detection portion that projects from the opening of the recess in a direction orthogonal to the connection direction and detects a voltage.
Moreover, the said spring part can also be set as the structure accommodated in the said recessed part through the said opening part so that attachment or detachment is possible.

  ADVANTAGE OF THE INVENTION According to this invention, the connection structure of the electrode part which can perform the maintenance inspection of each battery of a cell module formed by connecting a some battery in series and the load of a cell module safely is realizable.

It is a schematic sectional drawing which shows the whole structure of the cell module which concerns on one Embodiment of this invention. It is a figure which shows schematic structure of the battery which comprises a cell module, Comprising: (a) is the figure before attaching a spring part to a battery, and the figure which expands and shows a part, (b) is a battery It is a figure which shows the state which assembled | attached the spring part. (a) is schematic sectional drawing which shows the structure of the battery which has a spring part which provided the voltage detection part, (b) is schematic sectional drawing which shows the structure of the cell module formed by connecting the battery of the figure (a) in series It is. It is a figure for explaining that these batteries can be assembled and a cell module can be constituted only by arranging and restraining a plurality of batteries in series. It is a figure for demonstrating that each battery can be easily isolate | separated from a cell module only by releasing the restrictions of the some battery which comprises a cell module. It is a figure which shows the structure of the spring part welded to a recessed part.

  Hereinafter, a cell module of the present invention will be described with reference to the accompanying drawings. In FIG. 1, the schematic cross section of the whole structure of the cell module which concerns on one Embodiment of this invention is shown. As shown in FIG. 1, the cell module is configured by connecting a plurality of batteries 1 in series and constraining the plurality of batteries 1 in a connection direction (left-right direction in the figure). In addition, the pressing method for restraining the plurality of batteries 1 is not particularly limited. For example, a pair of plate-like members (end plates) can be provided at both ends in the connection direction of the battery 1, and the battery 1 can be restrained by these end plates. In this case, the pair of end plates are fixed by being fastened with screws or the like to both ends of a fastening member (a band-like band, a metal plate, or the like) extending in the connection direction of the battery 1 and connected to each other. . Thereby, the some battery 1 can be clamped between a pair of end plates, and it becomes possible to restrain and hold these batteries 1.

  In addition, although the structure of the cell module which connected three batteries 1 (battery 1a-1c) in series is shown as an example in FIG. 1, the number of the batteries 1 which comprise a cell module is not specifically limited, It is requested | required. It can be arbitrarily set according to conditions such as output level and mounting space. These batteries 1 have electrode parts (a positive electrode part and a negative electrode part) on both sides in the connection direction, and the adjacent batteries 1 are arranged in series so that different electrode parts are connected to each other. In the present embodiment, a rectangular flat plate is assumed as an example of the battery 1 (see FIG. 2), but the electrodes 1 (positive and negative) are provided on both sides in the connection direction, and the adjacent batteries 1 are different from each other. The type of the battery 1 is not particularly limited as long as it can be arranged in series so as to connect the parts. For example, a flat round coin-type battery can be assumed. The battery 1 may be a primary battery or a secondary battery. In addition, the size of the battery 1 is not particularly limited, and any size can be applied. However, the cell module is composed of a plurality of batteries 1 of the same form and the same type.

  In FIG. 2, schematic structure of the battery 1 which comprises a cell module is shown. FIG. 2A is an enlarged view showing a state before the spring portion 6 is assembled to the battery 1 constituting the cell module, and a part of the state, and FIG. It is a figure which shows the state which assembled | attached. As shown in FIG. 2, the battery 1 includes a buffer portion 2, a recess portion 3, a pair of electrode portions 4 and 5, and a spring portion 6.

  The buffer portion 2 covers the surface portion 11 on one side (for example, the right side in FIG. 1) in the connection direction and covers the restraint load in the connection direction (force indicated by the arrow F shown in FIG. 1. ). In this embodiment, the case where the buffer part 2 has coat | covered the surface part 11 of one side other than the recessed part 3 is assumed. When a plurality of batteries 1 are connected and restrained in series to constitute a cell module, the buffer portion 2 of one adjacent battery 1 is in contact with the surface portion 12 of the other battery 1. In other words, the buffer portion 2 is interposed between the surface portion 11 of one adjacent battery 1 and the surface portion 12 of the other battery 1. Thereby, when the some battery 1 is connected and restrained in series and a cell module is comprised, the restraint load F can be actively loaded by the buffer part 2. FIG. For this reason, the restraining load F loaded between a pair of electrode parts 4 and 5 of the adjacent battery 1 can be reduced markedly. As a result, the electrode parts 4 and 5 can be protected from the restraining load F, and it is possible to effectively prevent the electrode parts 4 and 5 from being damaged or deformed.

  Therefore, in order to perform such a function, the buffer portion 2 is formed of an elastic resin or the like that can apply the restraining load F. At this time, the thickness of the buffer portion 2 (dimension with respect to the connection direction) can be arbitrarily set according to the size of the restraining load F to be applied, the material of the resin, etc., but is set to be uniform. Thereby, the restraint load F can be uniformly applied by the whole buffer part 2. Moreover, the formation method of the buffer part 2 is not specifically limited. For example, the buffer portion 2 can be formed by applying a resin or immersing the surface portion 11. Alternatively, the buffer portion 2 may be formed separately from the battery 1 and may be bonded to the surface portion 11 with an adhesive or the like so as to be integrated with the battery 1.

  The recessed part 3 is provided in the surface part 11 on the one side in the connection direction, and is configured to be recessed from the buffer part 2 in the connection direction. In FIG. 2, the structure of the recessed part 3 formed by denting the surface part 11 to a connection direction is shown as an example. It should be noted that the dimensional difference with respect to the connection direction between the surface portion 11 and the buffer portion 2 formed on the surface portion 11 in other words, that is, the thickness corresponding to the thickness of the buffer portion 2 with respect to the connection direction, without recessing the surface portion 11 in this way. However, it is also possible to form a region recessed in the connecting direction with respect to the buffer portion 2 on the surface portion 11 and configure the region as a concave portion. If the size of the recess 3 (dimension A with respect to the connecting direction, area ratio with respect to the surface portion 11) and shape (planar shape, cross-sectional shape, etc.) can be accommodated in the recess 3, the spring portion 6 can be accommodated. What is necessary is just to set arbitrarily according to the magnitude | size, shape, etc. of this. As an example, FIG. 2A shows an example of the configuration of the recess 3 in which the planar shape in the connection direction is a substantially rectangular shape. Moreover, what is necessary is just to set the formation position of the recessed part 3 arbitrarily according to the position of the electrode part 4 mentioned later. FIG. 2 (a) shows an example of the configuration of the recess 3 positioned in the vicinity of the upper one side of the surface portion 11. For example, a configuration in which the recess 3 is positioned in the vicinity of the other upper side of the surface portion 11, the lower portion, or the central portion. It is also possible.

  Moreover, the recessed part 3 has the opening part 31 connected to the exterior with respect to the direction (for example, upper direction in FIG. 1) orthogonal to a connection direction. That is, the recess 3 has a configuration having an opening 31 at the upper outer periphery of the battery 1 and is open in the connection direction and is also open in a direction orthogonal to the connection direction. . Thereby, even if it is a case where the some battery 1 is connected in series and restrained and a cell module is comprised, the recessed part 3 will be in the state open | released outside through the opening part 31 (refer FIG. 1).

  Here, when the battery 1 is connected in series and restrained to constitute a cell module, a configuration for aligning the position of the opening 31 of the recess 3 of each battery 1 may be added to the battery 1. For example, you may provide the convex part and concave hole part which are mutually engaged with respect to the buffer part 2 of the adjacent battery 1 and the surface part 12 of the other battery 1. Thereby, when connecting and restraining the battery 1 in series, the opening 31 can be aligned at the same time as configuring the cell module by engaging the protrusion and the hole. It is possible to align the opening positions.

  One electrode portion 4 is exposed from the recess 3 to one side in the connection direction (for example, the right side in FIG. 1). In this case, for example, the positive electrode lead led out from the positive electrode body in the battery container is electrically connected to the electrode portion 4, whereby the electrode portion 4 becomes the positive electrode portion. On the other hand, the other electrode part 5 is exposed on the surface part 12 on the other side in the connection direction. In other words, the surface portion 12 is configured as an electrode surface portion of the electrode portion 5. For example, the negative electrode lead 5 led out from the negative electrode body in the battery container is electrically connected to the surface portion 12, whereby the negative electrode portion 5 is configured on the surface portion 12. In this case, the entire surface portion 12 may be configured as the electrode surface portion of the electrode portion 5, but the region on the surface portion 12 located on the opposite side of the recess 3 (electrode portion 4) with respect to the connection direction (recess equivalent region). It is also possible to configure only the electrode surface portion of the electrode portion 5. That is, it is only necessary that at least the concave portion corresponding region on the surface portion 12 is configured as the electrode surface portion of the electrode portion 5.

  Thereby, the electrode part 4 of one battery 1 and the other battery 1 are arranged by arranging a plurality of batteries 1 in series so that the surface part 11 of one adjacent battery 1 and the surface part 12 of the other battery 1 face each other. Can be opposed to each other through the recess 3 of one battery 1. For example, as shown in FIG. 1, in two adjacent batteries 1a and 1b, the electrode part 4a and the battery 1b of the battery 1a are arranged in series so that the surface part 11a of the battery 1a and the surface part 12b of the battery 1b face each other. Can be opposed to each other through the recess 3a of the battery 1a. Similarly, the electrode part 4b of the battery 1b and the electrode part 5c of the battery 1c can be opposed to each other through the recess 3b of the battery 1b. In addition, as long as any one of a pair of electrode parts 4 and 5 is a positive electrode and the other is a negative electrode, it does not ask which is a positive electrode (or negative electrode).

  The spring portion 6 is accommodated in the concave portion 3, and one electrode portion 4 (as an example, the electrode portion 4 a of the battery 1 a in FIG. 1) and the other electrode portion 5 of the battery 1 adjacent to the connection direction (the same battery). 1b electrode part 5b), and the adjacent batteries 1 are electrically connected. In this case, the spring part 6 is assembled in the battery 1 by being accommodated in the recess 3 so as to come into contact with the electrode part 4. In the state assembled to the battery 1, the spring portion 6 is in a state where it can be integrated with the battery 1 (the state shown in FIG. 2B). When a plurality of batteries 1 are connected and restrained in series to constitute a cell module, the spring part 6 is also in contact with the electrode part 5 of the other battery 1 facing the electrode part 4 of the adjacent one battery 1. It becomes a state. For example, as shown in FIG. 1, in two adjacent batteries 1a and 1b, the spring part 6a accommodated in the recess 3a of the battery 1a is in contact with the electrode part 4a and also in contact with the electrode part 5b of the battery 1b. It has become. Similarly, the spring part 6b accommodated in the recess 3b of the battery 1b is in contact with the electrode part 4b and also in contact with the electrode part 5c of the battery 1c.

  That is, the spring part 6 is interposed between the electrode part 4 of one battery 1 and the electrode part 5 of the other battery 1 adjacent to each other, so that these electrode parts 4 and 5 are electrically connected. Connect to. The spring portion 6 has a configuration in which the electrode portions 4 and 5 are connected to each other with multiple contacts so as to minimize the resistance between the adjacent batteries 1 and, in short, the resistance between the electrode portions 4 and 5 (so-called multiple contacts). Spring). In this case, as shown in FIG. 2 (a), the spring portion 6 is formed with a plurality of slit portions 61 at regular intervals along the longitudinal direction in a substantially rectangular metal plate having conductivity. A plurality of contact portions 62 are formed between 61, in other words, the contact portions 62 passed in the short direction are alternately arranged in parallel with the slit portions 61 in the long direction. . In addition, the number of the slit parts 61 and the contact parts 62 can be set arbitrarily. Each contact portion 62 is extended in the short direction so as to protrude alternately to both sides in the connection direction. In FIG. 2 (a), after projecting to one side in the connection direction (the recessed part 3 side of the adjacent battery 1 in which the spring part 6 is accommodated), the other side (the surface part 12 side of the other adjacent battery 1) is shown. The structure of the spring portion 6 is shown as an example in which the contact portions 62 are extended in the short direction so as to protrude to the other side. The configuration of the spring portion 6 is not particularly limited. For example, the contact portion 62 may be protruded to the other side in the connection direction, then protruded to the one side, and then protruded to the other side again. In addition, the spring portion 6 can be configured by alternately arranging the contact portion protruding to one side in the connection direction and the contact portion protruding to the other side in the longitudinal direction with the slit portion 61 interposed therebetween. .

  The spring portion 6 is restrained so that the resistance between the electrode portions 4 and 5 can be stabilized at a low value within the range of the depth of the recessed portion 3 to be accommodated (dimension A shown in FIG. 1). The spring displacement amount (spring elasticity) is set in consideration of an excessive load when the load F is applied. Specifically, the protrusion dimension of the contact portion 62 with respect to the connection direction may be set based on the excessive load when the restraining load F is applied. Moreover, the spring part 6 should just be positioned with respect to the recessed part 3 so that the expansion-contraction direction (elastic direction) may follow the connection direction of the electrode parts 4 and 5. FIG. Thereby, between the electrode parts 4 and 5 can be stably energized, the battery 1 arrange | positioned adjacently can be electrically connected stably, ie, a contact load can be stabilized.

  In this embodiment, the spring part 6 is accommodated in the recessed part 3 through the opening part 31 so that attachment or detachment is possible. In that case, the method for accommodating the spring part 6 in the recess 3 and assembling it integrally with the battery 1 is not particularly limited, and any method can be adopted. In the configuration shown in FIG. 2, a connecting portion 63 is provided at one end in the longitudinal direction of the spring portion 6, and a recess 33 for fitting the connecting portion 63 to the recess 3 is formed. In this case, the connecting portion 63 is a protruding piece that protrudes from the opening 31 in the direction of entry into the recess 3 (downward in FIG. 2), and the recessed portion 63 is recessed in the protruding direction of the connecting portion 63. It is a fitting part. Accordingly, the connecting portion 63 is pushed into the recess portion 33 in the protruding direction, so that they can be easily fitted, and the spring portion 6 is integrated with the battery 1 in a state where the spring portion 6 is accommodated in a predetermined position of the recessed portion 3. Can be assembled. Therefore, the spring part 6 accommodated in the recess 3 is opened in the opening 31 even when the batteries 1 are restrained without releasing the restraints of the plurality of batteries 1, that is, even after the cell module is configured. The spring portion 6 can be reattached to the recess 3 from the opening 31 and accommodated. That is, the spring part 6 can be detachably accommodated in the recess 3. Note that the size of the opening 31 may be set according to the size of the spring 6 so that the spring 6 can be smoothly attached to and detached from the recess 3 through the opening 31.

  Therefore, it is possible to easily cut off the electric circuit including the cell module by removing the spring portion 6 accommodated in the recess 3 from the opening 31. Moreover, it becomes possible to easily conduct | electrically_connect the interrupted electric circuit by attaching the removed spring part 6 again with respect to the recessed part 3 from the opening part 31. FIG. That is, the spring part 6 can function as a simple service plug. Further, it is possible to easily check whether or not an appropriate contact load is applied between the electrode portions 4 and 5 while the spring portion 6 is maintained at the set spring displacement amount. Thus, according to the connection structure of the electrode parts 4 and 5 according to this embodiment, each battery of the cell module formed by connecting a plurality of batteries 1 in series while protecting the electrode parts 4 and 5 from the restraining load F. 1 and cell module loads can be safely inspected and maintained.

  Moreover, it is also possible to set it as the structure which gave the function for detecting a voltage with respect to the spring part 6 together. FIG. 3 shows a configuration example having such a voltage detection function. 3A is a schematic cross-sectional view showing the configuration of a battery including a spring portion provided with a voltage detection unit used for voltage detection, and FIG. 3B is a diagram in which the batteries of FIG. It is a schematic sectional drawing which shows the structure of a cell module. In this case, the spring part 6 protrudes from the opening 31 of the recessed part 3 in a direction (vertical direction in FIG. 3) orthogonal to the connection direction, and includes the spring part 6 (in short, the battery 1) and the cell module. A voltage detector 7 is provided for detecting a voltage between any voltage measurement points on the electric circuit. Thereby, for example, the voltage between the batteries 1 can be easily measured by connecting a voltmeter between the voltage detectors 7 of the adjacent batteries 1. FIG. 3B shows, as an example, a configuration in which a voltmeter 8 is connected between the voltage detection unit 7a of the battery 1a and the voltage detection unit 7b of the battery 1b to measure the voltage between the batteries 1a and 1b. ing.

  That is, the spring part 6 having the voltage detection part 7 is accommodated in the concave part 3 and assembled to the battery 1, and the battery 1 is connected in series and restrained, and only the cell module is formed. Voltage measurement between the battery 1) and an arbitrary voltage measurement point on the electric circuit including the cell module can be easily performed. From another viewpoint, the work efficiency at the time of voltage measurement can be obtained only by providing the voltage detection unit 7 in the spring unit 6 without adding a special configuration change (for example, complicated change in shape) to the battery 1 itself. Can be improved. The voltage detection unit 7 may be formed integrally with the spring unit 6 (see FIG. 2). For example, the voltage detection unit 7 is formed of a conductive metal piece, and the metal piece is soldered to the spring unit 6. It is also possible to attach by, for example. FIG. 3 shows an example of the configuration of the voltage detection unit 7 provided so as to protrude from the opening 31 of the recess 3, but the voltage detection unit 7 is accommodated in the recess 3 without protruding from the opening 31. It is also possible to envisage a configuration that has been made. In short, as long as it is possible to connect the opening 31 to the voltage detector, the voltage detector does not necessarily have to protrude from the opening 31.

  As described above, in the state assembled to the battery 1, the spring portion 6 is in a state in which it can be integrated with the battery 1 (the state shown in FIG. 2B). By simply arranging and restraining 1 in series, current can be passed between the electrode portions 4 and 5 via the spring portion 6 to electrically connect the batteries 1. For example, as shown in FIG. 4, the battery 1b assembled with the spring 6b is arranged in series so that the electrode 4a and the electrode 5b are connected to the battery 1a assembled with the spring 6a. Similarly, the battery 1c assembled with the spring portion 6c is arranged in series so that the electrode portion 4b and the electrode portion 5c are connected to the battery 1b assembled with the spring portion 6b. And cell module is comprised by restraining these batteries 1a-1c (state shown in FIG. 1). That is, a cell module can be configured by assembling these batteries 1 only by arranging and restraining a plurality of batteries 1 in series. Thereby, the assembling property of the battery 1 can be improved and the productivity of the cell module can be improved.

  Moreover, each battery 1 can be easily separated from the cell module only by releasing the restraint of the plurality of batteries 1 constituting the cell module. FIG. 5 shows a state in which the plurality of batteries 1 are unbound and the battery 1c is separated from the battery 1b. Further, from this state, the battery 1b can be easily separated from the battery 1a. Therefore, for example, even when a failure occurs in a predetermined battery 1, the battery 1 can be easily replaced with a new battery 1. And a new cell module can be comprised only by assembling and restraining the battery 1 after replacement | exchange. Thereby, the exchange property of the battery 1 can be improved, and the reliability of the cell module can be improved.

  Here, in this embodiment, the spring part 6 is configured to be detachably accommodated in the recess 3 through the opening 31. However, when it is not necessary to attach and detach the spring portion, it is possible to adopt a configuration in which the spring portion is fixedly accommodated with respect to the recess 3. In this case, for example, the spring portion may be joined to the recess 3 by welding. In FIG. 6, an example of the spring part welded to the recessed part 3 is shown. In this case, the spring portion 60 has a configuration in which a plurality of contact portions 64 are arranged in parallel along the longitudinal direction at the lower end portion of a substantially rectangular metal plate having conductivity. Each contact portion 64 protrudes from the lower end portion of the spring portion 60 to one side in the connection direction (the surface portion 12 side of the adjacent battery 1) and is bent so as to be folded back to the lower end portion side of the spring portion 60. In addition, the number of the contact parts 64 can be set arbitrarily.

  By providing the contact portion 64 only on the lower end side of the spring portion 60 in this way, the spring portion 60 can ensure a relatively wide flat portion 65 along the electrode surface of the electrode portion 4 serving as a joint surface. The structure is suitable for joining. The spring portion 60 has a welded portion 66 with respect to the flat portion 65, and the welded portion 66 is welded to the electrode portion 4 to be joined to a predetermined position of the concave portion 3. In addition, the welding part 65 may be a part of the flat part 65, or may be the whole. Thereby, the spring part 60 is assembled integrally and fixedly with the battery 1 while being accommodated in the recess 3. In this state, the welded portion 65 is electrically connected to the electrode portion 4 exposed in the concave portion 3 and functions as an energizing portion in the spring portion 60. Further, in this state, the contact portion 64 can be electrically connected to the electrode portion 5 exposed at the surface portion 12 of the adjacent battery 1. In addition, what is necessary is just to set the spring part 60 as the structure which has the voltage detection part 7 similarly to the spring part 6 (FIG.1 and FIG.2) mentioned above.

DESCRIPTION OF SYMBOLS 1 Battery 2 Buffer part 3 Recessed part 4 One electrode part 5 The other electrode part 6 Spring part 11 One side surface part 12 The other side surface part 31 Opening part

Claims (3)

A cell module in which a plurality of batteries are connected in series, and the plurality of batteries are constrained in a connection direction,
The battery covers a surface portion on one side in the connection direction and buffers a restraining load in the connection direction; and
A concave portion that is provided on a surface portion on one side of the connection direction and is recessed from the buffer portion with respect to the connection direction; and one electrode portion that is exposed from the concave portion to one side of the connection direction;
The other electrode part exposed on the other side surface part in the connection direction;
A spring portion that is housed in the recess, contacts the other electrode portion of the battery adjacent to the one electrode portion and the connection direction, and is electrically connected to the adjacent battery;
The cell module, wherein the concave portion has an opening communicating with the outside in a direction orthogonal to the connection direction, and the spring portion can be removed from the opening .   2. The cell module according to claim 1, wherein the spring portion has a voltage detection unit that projects from the opening of the recess in a direction orthogonal to the connection direction and detects a voltage.   The cell module according to claim 1, wherein the spring portion is detachably accommodated in the concave portion through the opening.

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