CN221928242U

CN221928242U - Liquid cooling plate and battery pack

Info

Publication number: CN221928242U
Application number: CN202323598870.7U
Authority: CN
Inventors: 吴云川
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-12-27
Filing date: 2023-12-27
Publication date: 2024-10-29
Anticipated expiration: 2033-12-27

Abstract

The utility model discloses a liquid cooling plate and a battery pack, wherein the liquid cooling plate comprises: a bottom plate, wherein a cooling flow channel is arranged in the bottom plate; the crossbeam is arranged on one side of the thickness direction of the bottom plate and comprises a beam body, the beam body extends along the length direction of the bottom plate, a cavity extending along the length direction of the crossbeam is formed in the beam body and used for containing cooling medium, and the crossbeam is used for radiating for the pole of the battery core in the battery pack. According to the liquid cooling plate, the cross beam is used for radiating the pole of the battery core in the battery pack, so that the liquid cooling plate can cool one surface of the battery core in the battery pack along the thickness direction of the bottom plate and the pole, the problem of high temperature of the pole of the battery core during high-rate charge and discharge of the battery pack is effectively solved, and the safety and the service life of the battery pack are improved.

Description

Liquid cooling plate and battery pack

Technical Field

The utility model relates to the technical field of battery packs, in particular to a liquid cooling plate and a battery pack.

Background

The requirements of the pure electric automobile users on the endurance mileage are higher and higher, so that the energy of the battery pack is larger and larger, and meanwhile, the requirements on the quick charge time of the battery pack are shorter and shorter, so that the quick charge multiplying power is higher and higher. However, most of the existing battery thermal management systems reduce the temperature of the battery cell by cooling the bottom or top of the battery cell in the battery pack, and the temperature at the terminal of the battery cell is still higher under the condition of high-rate charge and discharge, so that the conventional thermal management scheme cannot meet the cooling requirement, and a certain safety risk exists.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the liquid cooling plate, which effectively solves the problem of high temperature of the pole of the battery core during high-rate charge and discharge of the battery pack, and improves the safety and service life of the battery pack.

The utility model further provides a battery pack, and the vehicle comprises the liquid cooling plate.

According to an embodiment of the utility model, a liquid cooling plate for a battery pack includes: a bottom plate, wherein a cooling flow passage is formed in the bottom plate; the cross beam is arranged on one side of the thickness direction of the bottom plate and comprises a beam body, the beam body extends along the length direction of the bottom plate, a cavity extending along the length direction of the cross beam is formed in the beam body and used for containing cooling medium, and the cross beam is used for radiating for the pole of the battery cell in the battery pack.

According to the liquid cooling plate provided by the embodiment of the utility model, the liquid cooling plate comprises the bottom plate and the cross beam, the cooling flow channel is formed in the bottom plate so that the bottom plate dissipates heat to one surface of the battery core along the thickness direction of the bottom plate, the cross beam is arranged on one side of the thickness direction of the bottom plate and comprises the beam body, the beam body extends along the length direction of the bottom plate, the beam body is internally provided with the cavity extending along the length direction of the cross beam, the cavity is used for containing cooling medium, and the cross beam is used for dissipating heat to the pole of the battery core in the battery pack so that the liquid cooling plate can cool down one surface of the battery core and the pole of the battery core along the thickness direction of the bottom plate, the problem of high temperature of the pole of the battery core during high-rate charge and discharge of the battery pack is effectively solved, and the safety and the service life of the battery pack are improved.

In some embodiments of the utility model, the cross member is a plurality of spaced apart along the width of the floor.

In some embodiments of the utility model, the beam further comprises: the reinforcing ribs are arranged in the cavity and are a plurality of spaced apart along the thickness direction of the bottom plate, two ends of each reinforcing rib along the width direction of the bottom plate are connected with the inner wall of the cavity, and each reinforcing rib extends along the length direction of the cross beam.

In some embodiments of the present utility model, the cavity is open at two ends in a length direction, and the liquid cooling plate further includes: and the two ends of the cavity in the length direction are provided with the plugging plates, and the plugging plates are used for plugging the cavity.

In some embodiments of the utility model, the cavity communicates with the cooling flow channel when the cooling medium in the cooling flow channel and the cooling medium in the cavity are the same.

In some embodiments of the present utility model, the cavity and the cooling flow channel are not communicated with each other, and the cooling medium in the cavity is a phase change material.

In some embodiments of the utility model, the floor and the cross beam are one piece.

According to an embodiment of the present utility model, a battery pack includes: the liquid cooling plate; the battery cells are arranged on the same side of the thickness direction of the bottom plate, the battery cells are arranged on at least one side of the width direction of the bottom plate along the same side of the thickness direction of the bottom plate, the bottom plate is used for radiating heat for the battery cells along one surface of the thickness direction of the bottom plate, and the cross beam is used for radiating heat for the pole of the battery cells.

According to the battery pack disclosed by the embodiment of the utility model, the liquid cooling plate is arranged, the cooling flow passage is formed in the bottom plate, so that the bottom plate dissipates heat to one surface of the battery core along the thickness direction of the bottom plate, the battery core is multiple and is positioned on the same side of the thickness direction of the bottom plate as the cross beam, the cavity extending along the length direction of the cross beam is formed in the beam body of the cross beam and is used for accommodating cooling medium, so that the cross beam dissipates heat to the poles of the battery, the cooling plate is used for cooling one surface of the battery core in the battery pack along the thickness direction of the bottom plate and the poles, the problem of high temperature of the poles of the battery core during high-rate charge and discharge of the battery pack is effectively solved, and the safety and the service life of the battery pack are improved.

In some embodiments of the present utility model, a tab is disposed on a terminal of the electrical core, and the tab is attached to the beam.

In some embodiments of the present utility model, the cross beams are a plurality of cells spaced apart along the width direction of the base plate, the cells are a plurality of groups spaced apart along the width direction of the base plate, the cells in each group of cells are arranged along the length direction of the base plate, and each group of cells is provided with one cross beam along at least one side of the width direction of the base plate.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

Fig. 1 is an exploded view of a battery pack according to an embodiment of the present utility model;

Fig. 2 is a structural view of a battery pack according to an embodiment of the present utility model, in which a cover plate is not shown;

fig. 3 is a liquid cooling plate of a battery pack according to an embodiment of the present utility model;

FIG. 4 is an enlarged view at A in FIG. 3;

FIG. 5 is a schematic diagram of a plurality of cells;

fig. 6 is an enlarged view at B in fig. 5.

Reference numerals:

1000. a battery pack;

100. a liquid cooling plate; 1. a bottom plate; 11. a liquid inlet; 12. a liquid outlet; 2. a cross beam; 21. a beam body; 211. a cavity; 2111; a subchamber; 22. reinforcing ribs;

200. A battery cell; 3. a wafer;

300. A case; 4. a cover plate; 5. and a side plate.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

A liquid cooling plate 100 according to an embodiment of the present utility model is described below with reference to the accompanying drawings,

As shown in fig. 1 to 3, a liquid cooling plate 100 according to an embodiment of the present utility model is used for a battery pack 1000, and the liquid cooling plate 100 includes a bottom plate 1 and a cross member 2. The bottom plate 1 has a cooling flow channel inside, the beam 2 is disposed on one side of the bottom plate 1 in the thickness direction and includes a beam body 21, the beam body 21 extends along the length direction of the bottom plate 1, a cavity 211 extending along the length direction of the beam 2 is disposed in the beam body 21, the cavity 211 is used for accommodating a cooling medium, and the beam 2 is used for dissipating heat for a pole of the battery cell 200 in the battery pack 1000.

It can be appreciated that the plurality of battery cells 200 of the battery pack 1000 are all located on the same side of the thickness direction of the bottom plate 1 with the cross beam 2, a cooling flow passage is formed in the bottom plate 1, so that the bottom plate 1 dissipates heat to one surface of the battery cells 200 along the thickness direction of the bottom plate 1, a cavity 211 extending along the length direction of the cross beam 2 is formed in the beam body 21 of the cross beam 2, the cavity 211 is used for containing cooling medium, so that the cross beam 2 dissipates heat to the poles of the battery, and the cooling is realized to one surface of the battery cells 200 in the battery pack 1000 along the thickness direction of the bottom plate 1 and the poles through the liquid cooling plate 100, so that the pole high temperature problem of the battery cells 200 during high-rate charge and discharge of the battery pack 1000 is effectively solved, and the safety and the service life of the battery pack 1000 are improved.

Meanwhile, the cross beam 2 is located at one side of the thickness direction of the bottom plate 1 and is connected with the bottom plate 1, when the temperature of the pole of the battery cell 200 is high, the cross beam 2 attached to the pole can rapidly guide out heat of the pole to the bottom plate 1, so that a cooling medium in a cooling channel located in the bottom plate 1 brings out the heat, and the purpose of cooling the pole of the battery cell 200 is further achieved. In addition, when the plurality of battery cells 200 in each group of battery cells 200 are arranged along the length direction of the bottom plate 1, the beam body 21 extends along the length direction of the bottom plate 1, so that the beam body 21 can radiate heat to the pole of each battery cell 200, and the cooling effect of the cross beam 2 is improved.

Further, the beam 2 is attached to the terminal of the battery cell 200, and the cooling medium is contained in the cavity 211 in the beam body 21, so that the beam 2 is used for dissipating heat of the terminal of the battery cell 200 in the battery pack 1000.

It should be noted that, the liquid cooling may be implemented by direct cooling or liquid cooling, and the structure of the liquid cooling is known to those skilled in the art, and will not be described in detail herein.

According to the liquid cooling plate 100 of the embodiment of the utility model, the liquid cooling plate 100 comprises a bottom plate 1 and a beam 2, a cooling flow passage is formed in the bottom plate 1, so that the bottom plate 1 dissipates heat to one surface of the battery cell 200 along the thickness direction of the bottom plate 1, the beam 2 is arranged on one side of the thickness direction of the bottom plate 1 and comprises a beam body 21, the beam body 21 extends along the length direction of the bottom plate 1, a cavity 211 extending along the length direction of the beam 2 is formed in the beam body 21, the cavity 211 is used for containing cooling medium, the beam 2 is used for dissipating heat to the pole of the battery cell 200 in the battery pack 1000, and therefore the liquid cooling plate 100 is used for cooling and reducing the temperature of one surface and the pole of the battery cell 200 in the battery pack 1000 along the thickness direction of the bottom plate 1, further the pole high-temperature problem of the battery pack 1000 during high-rate charge and discharge is effectively solved, and the safety and the service life of the battery pack 1000 are improved.

In some embodiments of the present utility model, as shown in fig. 3, the cross member 2 is a plurality of spaced apart along the width direction of the base plate 1. It can be understood that, when the battery cell 200 is provided with the poles on two sides of the width direction of the bottom plate 1, the two cross beams 2 are spaced apart along the width direction of the bottom plate 1, so that the two cross beams 2 respectively dissipate heat to the poles on two sides of the battery cell 200 along the width direction of the bottom plate 1, thereby further improving the cooling effect of the poles of the battery cell 200. Or, when the battery cells 200 are multiple groups spaced apart along the width direction of the bottom plate 1, the multiple battery cells 200 in each group of battery cells 200 are arranged along the length direction of the bottom plate 1, and the multiple cross beams 2 are multiple spaced apart along the width direction of the bottom plate 1, so that the multiple cross beams 2 respectively dissipate heat to the poles of the battery cells 200 in each group of battery cells 200, thereby further improving the cooling effect of the poles of each group of battery cells 200.

In some embodiments of the utility model, as shown in fig. 4, the cross beam 2 further comprises a stiffener 22. Wherein, the reinforcing ribs 22 are arranged in the cavity 211 and are a plurality of the reinforcing ribs which are spaced along the thickness direction of the bottom plate 1, two ends of the reinforcing ribs 22 along the width direction of the bottom plate 1 are connected with the inner wall of the cavity 211, and each reinforcing rib 22 extends along the length direction of the cross beam 2. It can be appreciated that the reinforcing ribs 22 divide the cavity 211 into a plurality of subchambers 2111 along the thickness direction of the bottom plate 1, and each subchamber 2111 is internally provided with a cooling medium, two ends of the reinforcing ribs 22 along the width direction of the bottom plate 1 are connected with the inner wall of the cavity 211, and each reinforcing rib 22 extends along the length direction of the cross beam 2, so that the overall structural strength of the cross beam 2 is effectively improved, and the reliability of the liquid cooling plate 100 is improved.

In some embodiments of the present utility model, as shown in fig. 4, the two ends of the cavity 211 in the length direction are open, and the liquid cooling plate 100 further includes a plugging plate (not shown in the figure), where the plugging plate is disposed at two ends of the cavity 211 in the length direction, for plugging the cavity 211. It can be understood that the two ends of the cavity 211 in the length direction are opened, so that the cooling medium can be conveniently filled into the cavity 211 through the opened ends of the cavity 211, the cavity 211 is blocked by the blocking plate, the tightness of the cavity 211 is ensured, the cooling medium is prevented from flowing out, and the heat dissipation effect of the cross beam 2 on the pole of the battery cell 200 is ensured.

In some embodiments of the present utility model, the cavity 211 communicates with the cooling flow channel when the cooling medium in the cooling flow channel and the cooling medium in the cavity 211 are the same. Therefore, heat dissipation to one of the surfaces of the battery cell 200 along the thickness direction of the bottom plate 1 is realized by the flow of the cooling medium in the cooling flow channel of the bottom plate 1, and heat dissipation to the pole of the battery cell 200 is realized by the flow of the cooling medium in the cavity 211, so that cooling to one of the surfaces of the battery cell 200 and the pole along the thickness direction of the bottom plate 1 is realized. Meanwhile, the cooling medium can flow to the cavity 211 after the liquid inlet 11 of the bottom plate 1 enters the cooling flow channel through the cavity 211 and flows to the liquid outlet 12 of the bottom plate 1 from the cavity 211, so that the cooling medium is conveniently communicated in the cavity 211 and the cooling channel, an inlet and an outlet for the cooling medium to enter and exit are not required to be formed in the cavity 211, and the processing difficulty is reduced.

In some embodiments of the present utility model, the cavity 211 and the cooling flow channel are not in communication with each other, and the cooling medium in the cavity 211 is a phase change material. It can be understood that the cross beam 2 is arranged at one side of the thickness direction of the bottom plate 1 and is connected with the bottom plate 1, when the temperature of the pole of the battery cell 200 is higher, the phase change material in the cross beam 2 attached to the pole changes phase, and the heat of the pole is rapidly guided out to the bottom plate 1 by utilizing the latent heat of the phase change material, so that the heat is brought out by a cooling medium in a cooling channel in the bottom plate 1, and the purpose of cooling the pole of the battery cell 200 is further realized.

In some embodiments of the utility model, the floor 1 and the cross beam 2 are one piece. Thus, the connection strength between the bottom plate 1 and the cross member 2 is improved by such arrangement, and the bottom plate 1 and the cross member 2 can be housed together in the case 300 of the battery pack 1000 when the battery pack 1000 using the liquid cooling plate 100 is assembled, thereby reducing the assembly order.

Further, the liquid cooling plate 100 is manufactured by an aluminum profile extrusion process, so that integration of the bottom plate 1 and the cross beam 2 is realized, the number of parts is reduced, the processing process is simple, development cost is further reduced, and the weight of the liquid cooling plate 100 is reduced.

Furthermore, the aluminum profile adopts 6 series aluminum, so that the beam 2 attached to the pole can quickly transfer the heat of the pole to the cooling medium in the liquid cooling plate 100, and the cooling effect is further improved.

The battery pack 1000 according to the embodiment of the present utility model is described below.

The battery pack 1000 according to an embodiment of the present utility model, as shown in fig. 1 to 5, includes a liquid cooling plate 100 and a battery cell 200. The plurality of battery cells 200 are located on the same side of the bottom plate 1 in the thickness direction with the cross beam 2, at least one side of the battery cells 200 along the width direction of the bottom plate 1 is provided with a pole, the bottom plate 1 is used for radiating heat for one of the surfaces of the battery cells 200 along the thickness direction of the bottom plate 1, and the cross beam 2 is used for radiating heat for the pole of the battery cells 200.

It can be understood that when the battery cell 200 is provided with a pole on one side of the width direction of the bottom plate 1, the beam 2 is located on one side of the battery cell 200 near the pole along the width direction of the bottom plate 1, and the beam body 21 passing through the beam 2 is provided with a cavity 211 extending along the length direction of the beam 2, and the cavity 211 is used for accommodating a cooling medium, so that the beam 2 dissipates heat to the pole of the battery. Or, when the battery cell 200 is provided with the pole at two sides along the width direction of the bottom plate 1, the beam 2 is located at one side of the battery cell 200 along the width direction of the bottom plate 1, and the cavity 211 extending along the length direction of the beam 2 is formed in the beam body 21 of the beam 2, and the cavity 211 is used for accommodating a cooling medium, so that the beam 2 dissipates heat to the pole at one side of the battery. Meanwhile, the cooling flow channel is formed in the bottom plate 1, so that the bottom plate 1 dissipates heat to one surface of the battery cell 200 along the thickness direction of the bottom plate 1, the liquid cooling plate 100 is used for cooling one surface and the pole of the battery cell 200 in the battery pack 1000 along the thickness direction of the bottom plate 1, and the problem of high temperature of the pole of the battery cell 200 during high-rate charge and discharge of the battery pack 1000 is effectively solved, and the safety and the service life of the battery pack 1000 are improved.

According to the battery pack 1000 of the embodiment of the utility model, the liquid cooling plate 100 is arranged, a cooling flow passage is formed in the bottom plate 1, so that the bottom plate 1 dissipates heat to one surface of the battery cell 200 along the thickness direction of the bottom plate 1, the battery cell 200 is multiple and is positioned on the same side of the bottom plate 1 along the thickness direction of the bottom plate, the beam body 21 of the beam 2 is internally provided with the cavity 211 extending along the length direction of the beam 2, the cavity 211 is used for containing cooling medium, so that the beam 2 dissipates heat to the pole of the battery, and therefore, the cooling plate 100 is used for cooling one surface of the battery cell 200 in the battery pack 1000 along the thickness direction of the bottom plate 1 and the pole, and further, the problem of high temperature of the pole of the battery cell 200 during high-rate charge and discharge of the battery pack 1000 is effectively solved, and the safety and the service life of the battery pack 1000 are improved.

In some embodiments of the present utility model, as shown in fig. 6, a tab 3 is provided on a terminal of the battery cell 200, and the tab 3 is attached to the beam 2. It can be understood that after the tabs 3 connect the positive pole and the negative pole of the two adjacent electric cores 200 in series, when the temperature of the poles is higher, the heat of the poles can be quickly transferred to the cross beam 2 by utilizing the high heat conductivity coefficient of aluminum bars through the lamination of the tabs 3 and the cross beam 2, and the cooling of the poles is realized by radiating through the cooling medium poles in the cross beam 2.

Further, the tab 3 and the cross beam 2 are bonded together through heat-conducting glue, so that the tab 3 and the cross beam 2 are bonded.

Further, the liquid cooling plate 100 is manufactured by an aluminum profile extrusion process, and the tabs 3 are aluminum bars, so that heat of the pole is more quickly transferred to the aluminum cross beam 2 through the aluminum bars.

In some embodiments of the present utility model, as shown in fig. 3, the cross beams 2 are a plurality of cells 200 spaced apart along the width direction of the base plate 1, and the plurality of cells 200 in each group of cells 200 are arranged along the length direction of the base plate 1, and each group of cells 200 is provided with one cross beam 2 along at least one side of the width direction of the base plate 1. Therefore, through the arrangement, the beam 2 dissipates heat to the poles of the plurality of battery cells 200 of each group of battery cells 200, so that the problem of high temperature of the poles of the battery cells 200 during high-rate charge and discharge of the battery pack 1000 is further solved, and the safety and the service life of the battery pack 1000 are improved.

In some embodiments of the present utility model, as shown in fig. 1 and 2, the battery pack 1000 further includes a case 300. Wherein, liquid cooling board 100 and electric core 200 are located in box 300, and bottom plate 1 is connected with box 300. It can be understood that, in the process of assembling the battery pack 1000, the liquid cooling plate 100 is firstly placed in the box 300, the bottom plate 1 is connected with the box 300, the plurality of electric cores 200 are then placed on one side of the liquid cooling plate 100 where the cross beam 2 is arranged, and finally the cover plate 4 of the box 300 is covered, so as to realize the assembly of the battery pack 1000.

Further, the base plate 1 and the case 300 are welded by friction stir welding. Further, the cross member 2 is spaced apart from the side plates 5 of the case 300 to secure the safety of the battery pack 1000.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A liquid cooling plate for a battery pack, the liquid cooling plate comprising:

A bottom plate, wherein a cooling flow passage is formed in the bottom plate;

The cross beam is arranged on one side of the thickness direction of the bottom plate and comprises a beam body, the beam body extends along the length direction of the bottom plate, a cavity extending along the length direction of the cross beam is formed in the beam body and used for containing cooling medium, and the cross beam is used for radiating for the pole of the battery cell in the battery pack.

2. The liquid cooling plate according to claim 1, wherein the cross member is a plurality of cross members spaced apart in the width direction of the bottom plate.

3. The liquid cooling plate according to claim 1, wherein the cross member further comprises:

the reinforcing ribs are arranged in the cavity and are a plurality of spaced apart along the thickness direction of the bottom plate, two ends of each reinforcing rib along the width direction of the bottom plate are connected with the inner wall of the cavity, and each reinforcing rib extends along the length direction of the cross beam.

4. The liquid cooling plate according to claim 1, wherein both ends in a length direction of the cavity are open, the liquid cooling plate further comprising:

And the two ends of the cavity in the length direction are provided with the plugging plates, and the plugging plates are used for plugging the cavity.

5. The liquid cooling plate according to claim 1, wherein the cavity communicates with the cooling flow passage when the cooling medium in the cooling flow passage and the cooling medium in the cavity are the same.

6. The liquid cooling plate according to claim 1, wherein the cavity and the cooling flow passage are not communicated with each other, and the cooling medium in the cavity is a phase change material.

7. The liquid cooling plate according to claim 1, wherein the bottom plate and the cross member are one piece.

8. A battery pack, comprising:

the liquid cooling plate according to any one of claims 1 to 7;

The battery cells are arranged on the same side of the thickness direction of the bottom plate, the battery cells are arranged on at least one side of the width direction of the bottom plate along the same side of the thickness direction of the bottom plate, the bottom plate is used for radiating heat for the battery cells along one surface of the thickness direction of the bottom plate, and the cross beam is used for radiating heat for the pole of the battery cells.

9. The battery pack of claim 8, wherein tabs are provided on the poles of the cells, the tabs being attached to the cross beam.

10. The battery pack according to claim 8, wherein the cross members are a plurality of the cells spaced apart in the width direction of the base plate, the cells in each of the cell groups are arranged in the length direction of the base plate, and each of the cells is provided with one of the cross members on at least one side in the width direction of the base plate.