CN105259509B - The device and method of connecting cable resistance between a kind of online measurement battery - Google Patents
The device and method of connecting cable resistance between a kind of online measurement battery Download PDFInfo
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- CN105259509B CN105259509B CN201510680773.3A CN201510680773A CN105259509B CN 105259509 B CN105259509 B CN 105259509B CN 201510680773 A CN201510680773 A CN 201510680773A CN 105259509 B CN105259509 B CN 105259509B
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Abstract
The present invention relates to the device and method of connecting cable resistance between online measurement battery, the device is used to control batteries to discharge by discharge module；Voltage cable detection module is used in sample battery group the voltage at connecting cable both ends between two adjacent sections battery and is converted into the first signal output；Current detection module is used for the discharge current of sample battery group and is converted into secondary signal output；Processor is used for output control order to discharge module, gradually controls the batteries to discharge by discharge module, the magnitude of voltage and discharge current value at cable both ends when also receiving the first signal, discharging corresponding to secondary signal is converted into, and calculates the resistance of cable；Voltage cable detection module is connected with one end of cable by a switch respectively, and the cable other end is grounded by a switch, and is connected with isolation resistance between cable and ground connection or between cable and voltage cable detection module.The resistance of connecting cable between measurement batteries can be measured using the device and method.
Description
Technical field
The present invention relates to online accumulator checking instrument apparatus, more specifically to a kind of online measurement battery
Between connecting cable resistance device and method.
Background technology
In industries such as electric power, communications, floating charging is carried out to battery by charging equipment, in the situation that alternating current breaks down
Under, powered by batteries to load.Now, the capacity of battery meets to hinder the discharge capacity in power off time for some reason；Including
Accident dc motor at initial stage starting current and other impact load electric currents；And also include in batteries last discharge time
Superposition random load electric current.As the capacity of modern power systems and communication system is increasingly huge, to batteries reliable operation
Property has higher requirement, it is necessary to assure batteries can when AC system breaks down powering load, otherwise will make
Into heavy losses, therefore, batteries are had to monitor on-line, and safeguarded according to monitoring result.In battery
Resistance parameter can reflect the health status of battery, be connected between battery by connecting cable, when connecting cable be corroded or with
When battery electrode column connection is insecure, the connection resistance between battery can greatly increase, and so as to add the internal resistance of whole group power supply, increase
Add the loss of energy, seriously reduce the performance of batteries.If the situation of connecting cable can not be found in time, when connection electricity
Cable resistance persistently increases, or even influences whether the busbar voltage of straight-flow system, and hidden danger is brought to straight-flow system.
The content of the invention
The technical problem to be solved in the present invention is, there is provided connecting cable resistance between a kind of online measurement battery
Device and method, the resistance of connecting cable between batteries can be measured with accurate measurement.
The technical solution adopted for the present invention to solve the technical problems is：Connect between a kind of online measurement battery of construction
The device of cable resistance is connect, including：
Discharge module, for controlling batteries to discharge；
Voltage cable detection module, it is connected with the batteries, is stored for sampling two adjacent sections in the batteries
The voltage at connecting cable both ends and the first signal output is converted between battery；
Current detection module, it is connected with the batteries, the discharge module and forms loop, for sampling the electric power storage
The discharge current of pond group is simultaneously converted into secondary signal output；
Processor, it is connected with the discharge module, the voltage cable detection module, the current detection module, it is wrapped
Include：
Control unit, for output control order to the discharge module, the storage is gradually controlled by the discharge module
Battery power discharge；
Computing unit, receive first signal, the current detection module of the voltage cable detection module output
The secondary signal of output, the magnitude of voltage at the cable both ends and the electric discharge of the batteries when being converted into corresponding discharge
Current value, calculate the resistance of the cable；
The device of connecting cable resistance also includes between the online measurement battery：Some resistance and some switches；
The voltage cable detection module is connected with one end of the cable by a switch respectively, and the other end of the cable passes through one
Switch ground connection, and be connected with and isolate between the cable and ground connection or between the cable and the voltage cable detection module
Resistance.
Preferably, the device of connecting cable resistance also includes between the online measurement battery：
Battery voltage sensing module, it is connected respectively with the processor, the batteries, for sampling the battery
In group single-unit battery electric discharge when and electric discharge shut-off when both ends voltage and be converted into the 3rd signal and the 4th signal output extremely
The calculation control unit, the electricity at single-unit battery both ends when being turned off when the calculation control unit is according to electric discharge with electric discharge
The discharge current of pressure and the batteries, calculate the internal resistance value of the single-unit battery.
Preferably, the device of connecting cable resistance also includes between the online measurement battery：
Power supply module, it is connected with the processor, the dress of connecting cable resistance between the online measurement battery
Put power supply.
Preferably, the battery voltage sensing module respectively with one end of single-unit battery in the batteries by every
From resistance and a switch connection, it is grounded after the switch of other end connection one of the single-unit battery.
Preferably, the battery voltage sensing module, the voltage cable detection module and the single-unit battery and institute
The switch stated between cable is electronic switch, is connected with the processor, for receiving the control instruction of the processor output
Turn on and off.
Preferably, the device of connecting cable resistance also includes between the online measurement battery：
Communication module, be connected with the processor communication, the processor by the communication module send data or
Receive data.
The method that the present invention also provides connecting cable resistance between a kind of online measurement battery, comprises the steps：
Batteries are controlled to discharge by discharge module, until discharge current is stable；
When discharge current is stable, voltage cable detection module is sampled in the batteries between two adjacent sections battery
The voltage at connecting cable both ends, and be the first signal output to processor by the photovoltaic conversion at the cable both ends；
When discharge current is stable, the current detection module samples the discharge current of the batteries, and by described in
Discharge current is converted into secondary signal and exported to the processor；
The processor by first signal and the secondary signal, be converted into corresponding to the cable both ends voltage
Value and the discharge current value, calculate the resistance of the cable.
Preferably, also comprise the steps：
S110, when the batteries are discharged, during battery voltage acquisition module sampling electric discharge, electric discharge shut-off when institute
State the voltage at first segment battery both ends and be converted into the 3rd 1 signal, the 4th 1 signal output to the processor, the electricity
The electric current of first segment battery is converted into the 2nd 1 signal output to the processor during stream acquisition module sampling electric discharge；
S120, discharged again to the batteries, when the battery voltage acquisition module sampling is discharged, discharge shut-off at present
The voltage at one section battery both ends and be converted into the 3rd binary signal, the 4th binary signal is exported to the processor, the electric current is adopted
The electric current of next section battery is converted into the second binary signal and exported to the processor during collection module samples electric discharge；
S130, when judging final section battery discharging and during electric discharge shut-off both ends voltage, and electric current during electric discharge
Whether completion is sampled, if it is not, then returning to step S120；
Also comprise the steps：The processor according to electric discharge when and electric discharge turn off when the batteries both ends electricity
Pressure value, and discharge current value calculate the internal resistance value of the batteries.
Preferably, when the battery voltage sensing module connection batteries, start to sample the batteries
During voltage, then the connection of the voltage cable detection module and the batteries is disconnected.
Implement the present invention, have the advantages that：Batteries are controlled to discharge by discharge module, voltage cable detection
In module samples batteries the voltage at connecting cable both ends and the first signal output is converted between two adjacent sections battery extremely
Processor；The discharge current of current detection module sample battery group is simultaneously converted into secondary signal and exported to processor；Processor
According to the voltage at cable both ends and the discharge current of batteries, the resistance of cable can be accurately calculated, it is accurate so as to reach
The effect of connecting cable resistance between measurement batteries.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the theory diagram of the device of direct-current discharge method measurement accumulator internal resistance under prior art；
Fig. 2 be the present invention online measurement battery between connecting cable resistance device theory diagram；
Fig. 3 be the present invention online measurement battery between connecting cable resistance device circuit diagram；
Fig. 4 be the present invention online measurement battery between connecting cable resistance method flow chart.
Embodiment
Under the conditions of prior art, generally use direct-current discharge method measures accumulator internal resistance, direct-current discharge in straight-flow system
Method is by carrying out transient large current discharge to battery, measuring the transient voltage variable quantity on battery, calculated by Ohm's law
Go out accumulator internal resistance, direct-current discharge method measurement accumulator internal resistance theory diagram is as shown in Figure 1.
Direct-current discharge method measures the step of accumulator internal resistance：
The first step：Control discharge module 100 to discharge batteries by processor 400, treat batteries electric discharge one
It is stable after the section time；
Second step：The control voltage detection module 250 of processor 400 and current detection module 300, current detection module 300
Sample discharge current I, the sample battery both end voltage U of voltage detection module 2501；
3rd step：Stop discharging to batteries, the open-circuit voltage U of voltage acquisition module sample battery；According to ohm
Law is drawn：
U=U1+I×R
Then calculate resistance：
The battery resistance of the method measurement is accumulator internal resistance and connecting cable resistance sum, according to the resistance of measurement without
Method judges the health status of battery and the performance of connecting cable, it is necessary to be measured using off-line type scheme, using off-line type
Measurement scheme needs man-hour manually hand-held instrument to measure, and adds the complexity of operation, human error easily occurs, while also drop
The low reliability of straight-flow system.
The defects of existing for prior art, the present invention provide connecting cable resistance between a kind of online measurement battery
Device, by the resistance for accurately measuring connecting cable, it can be determined that the reliability of batteries.As shown in Fig. 2 in the present invention
Online measurement battery between connecting cable resistance device first embodiment in, the device include discharge module 100, electricity
Cable voltage detection module 200, current detection module 300, processor 400, and some resistance and some switches.
Discharge module 100 is used to control batteries 800 to discharge.
Voltage cable detection module 200 is connected with batteries 800 and processor 400, in sample battery group 800
Between two adjacent sections battery the voltage at connecting cable both ends and the first signal output is converted into processor 400.Specifically,
One signal can be voltage signal.
Current detection module 300 is connected to form loop with batteries 800, discharge module 100, also connects with processor 400
Connect, for sample battery group 800 discharge current and be converted into secondary signal and export to processor 400.Specifically, the second letter
Number can be voltage signal.
Processor 400 is connected with discharge module 100, voltage cable detection module 200, current detection module 300.Processor
400 include control unit 410, computing unit 420.
Control unit 410 is used for output control order to discharge module 100, and battery is gradually controlled by discharge module 100
The electric discharge of group 800.
Computing unit 420 receives the first signal of the output of voltage cable detection module 200, current detection module 300 exports
Secondary signal, by the first signal be converted into corresponding to discharge when cable both ends magnitude of voltage, secondary signal is converted into electric power storage
The discharge current value of pond group 800, calculate the resistance of cable.
As shown in figure 3, voltage cable detection module 200 is connected with one end of cable by a switch respectively, cable it is another
One end by one switch be grounded, and be connected between cable and ground connection or between cable and voltage cable detection module 200 every
From resistance.
Further, as shown in Fig. 2 the device of connecting cable resistance also includes battery electricity between online measurement battery
Press detection module 500.Battery voltage sensing module 500 is connected with processor 400, batteries 800 respectively, for sampling electric power storage
Single-unit battery the voltage at both ends and is converted into the 3rd signal and the 4th signal is defeated in electric discharge and during electric discharge shut-off in pond group 800
Go out to calculation control unit 410, the electricity at single-unit battery both ends when being turned off when calculation control unit 410 is according to electric discharge with electric discharge
The discharge current of pressure and batteries 800, calculate the internal resistance value of single-unit battery.
Further, as shown in Fig. 2 the device of connecting cable resistance also includes power supply mould between online measurement battery
Block 600.Power supply module 600 is connected with processor 400, and the device of connecting cable resistance supplies between online measurement battery
Electricity.
Further, as shown in figure 3, battery voltage sensing module 500 respectively with single-unit battery in batteries 800
One end is connected by isolation resistance and a switch, is grounded after the switch of other end connection one of the single-unit battery.
Further, battery voltage sensing module 500, voltage cable detection module 200 and single-unit battery and cable it
Between switch be electronic switch, be connected with processor, for reception processing device output control instruction turn on and off.Electronic cutting
Close such as relay, metal-oxide-semiconductor.
Further, the device of connecting cable resistance also includes communication module 700 between online measurement batteries.It is logical
Letter module 700 communicates to connect with processor 400, and processor 400 sends data by communication module 700 or receives data.
The method that the present invention also provides connecting cable resistance between a kind of online measurement battery, as described in Figure 4, the party
Method comprises the steps：
S100, by discharge module 100 batteries 800 are controlled to discharge, until discharge current is stable.
S200, when discharge current is stable, two adjacent sections stores in the sample battery group 800 of voltage cable detection module 200
The voltage at connecting cable both ends between battery, and be the first signal output to processor 400 by the photovoltaic conversion at cable both ends.
S300, when discharge current is stable, the discharge current of the sample battery group 800 of current detection module 300, and putting
Electric current is converted into secondary signal and exported to processor 400.
S400, processor 400 by the first signal and secondary signal, be converted into corresponding to cable both ends magnitude of voltage and put
Electric current value, calculate the resistance of cable.
It should be noted that in other embodiments, step S200 and step S300 can be performed, when also can be different simultaneously
Perform.
Further, the method for connecting cable resistance also comprises the steps between online measurement battery：
S110, when batteries 800 are discharged, battery voltage acquisition module 500 sampling electric discharge when, electric discharge shut-off when first
The voltage at section battery both ends is simultaneously converted into the 3rd 1 signal, the 4th 1 signal output to processor 400, current acquisition module
The electric current of first segment battery is converted into the 2nd 1 signal output to processor 400 during 300 sampling electric discharge.
S120, discharged again to batteries 800, battery voltage acquisition module 500 sampling electric discharge when, electric discharge shut-off when it is next
The voltage at section battery both ends and be converted into the 3rd binary signal, the 4th binary signal is exported to processor 400, current acquisition module and adopted
The electric current of next section battery is converted into the second binary signal and exported to processor 400 during sample electric discharge.
S130, when judging final section battery discharging and during electric discharge shut-off both ends voltage, and electric current during electric discharge
Whether completion is sampled, if it is not, then returning to step S120.
The method of connecting cable resistance also comprises the steps between online measurement battery：Processor 400 is according to putting
The magnitude of voltage at the both ends of batteries 800, and the internal resistance of discharge current value calculating accumulator group 800 when electric and during electric discharge shut-off
Value.
Further, when the battery voltage sensing module 500 connects batteries 800, beginning sample battery group 800
Voltage when, then disconnect voltage cable detection module 200 and the connection of batteries 800.
In another embodiment, connecting cable resistance concretely comprises the following steps between online measurement batteries：
The first step：Processor 400 controls discharge module 100, and batteries 800 are discharged, and waits batteries 800
Discharge stability；
Second step：After discharge stability, closure switch K1 and K2, processor 400 are measured by voltage cable detection module 200
Connecting cable terminal voltage UR；
3rd step：Switch K1 and K2, closure switch H1 and H2 are disconnected, processor 400 is by controlling battery voltage sampling electric
Drive test obtains single-unit accumulator voltage U in batteries 800B1, while current detection module measurement discharge current IR；
4th step：Processor 400 controls discharge module 100, stops discharging to batteries 800, measures battery terminal voltage
UB2；
Obtained by Ohm's law, the connecting cable resistance R1 equation below between battery：
Internal resistance of cell RBEquation below：
Single-unit battery in each connecting cable and batteries is measured by above method, you can owned
Connecting cable resistance and accumulator internal resistance resistance.
In summary, the technical problems to be solved by the invention are, there is provided a kind of online accurate measurement battery it
Between connecting cable resistance device and method, prevent because between battery connecting cable influence straight-flow system functional reliability.
The present invention to batteries by discharging, and after discharge stability, gathers the electricity at connecting cable both ends between battery
Pressure and discharge current, the resistance of cable can be accurately calculated, in addition, according to single-unit in batteries during electric discharge and when electric discharge turns off
The voltage and discharge current at battery both ends, calculate the internal resistance of the battery, and the process entirely measured is convenient, easy.
The resistance of connecting cable is milliohm rank between battery, or even micro-ohm rank, measures the resistance of this order of magnitude,
It is highly susceptible to external interference.Connecting cable resistance proposes a kind of online detection scheme between the present invention is directed to battery, leads to
Cross the resistance of accurate measurement connecting cable, it can be determined that the reliability of batteries, while unreliable point can be detected, it is convenient
Maintenance, realize simply, it is easy to operate；The functional circuit, hardware cost can be increased on the basis of accumulator internal resistance measuring circuit
It is low.
It should be understood that above example only expresses the preferred embodiment of the present invention, it describes more specific and detailed
Carefully, but the limitation to the scope of the claims of the present invention therefore can not be interpreted as；It should be pointed out that the common skill for this area
For art personnel, without departing from the inventive concept of the premise, independent assortment can be carried out to above-mentioned technical characterstic, can also done
Go out several modifications and improvements, these belong to protection scope of the present invention；Therefore, it is all to be done with scope of the invention as claimed
Equivalents and modification, the covering scope of the claims in the present invention all should be belonged to.
Claims (9)
- A kind of 1. device of connecting cable resistance between online measurement battery, it is characterised in that including：Discharge module (100), for controlling batteries (800) to discharge；Voltage cable detection module (200), it is connected with the batteries (800), for sampling in the batteries (800) The voltage at connecting cable both ends and the first signal output is converted between two adjacent sections battery；Current detection module (300), it is connected to form loop with the batteries (800), the discharge module (100), is used for Sample the discharge current of the batteries (800) and be converted into secondary signal output；Processor (400), with the discharge module (100), the voltage cable detection module (200), the current detecting mould Block (300) connects, and it includes：Control unit (410), for output control order to the discharge module (100), by the discharge module (100) gradually The batteries (800) are controlled to discharge；Computing unit (420), receive first signal, the electric current inspection of voltage cable detection module (200) output The secondary signal of module (300) output is surveyed, the magnitude of voltage at the cable both ends and the storage when being converted into corresponding discharge The discharge current value of battery pack (800), calculate the resistance of the cable；The device of connecting cable resistance also includes between the online measurement battery：Some resistance and some switches；It is described Voltage cable detection module (200) is connected with one end of the cable by a switch respectively, and the other end of the cable passes through One switch ground connection, and connect between the cable and ground connection or between the cable and the voltage cable detection module (200) It is connected to isolation resistance.
- 2. the device of connecting cable resistance between wire type measurement battery according to claim 1, it is characterised in that described The device of connecting cable resistance also includes between online measurement battery：Battery voltage sensing module (500), it is connected respectively with the processor (400), the batteries (800), for adopting In batteries described in sample (800) single-unit battery electric discharge when and electric discharge shut-off when both ends voltage and be converted into the 3rd signal With the 4th signal output to the calculation control unit (410), the calculation control unit (410) is closed according to during electric discharge with electric discharge The voltage at the single-unit battery both ends and the discharge current of the batteries (800), calculate the single-unit battery when disconnected Internal resistance value.
- 3. the device of connecting cable resistance between online measurement battery according to claim 1, it is characterised in that institute The device of connecting cable resistance also includes between stating online measurement battery：Power supply module (600), it is connected with the processor (400), connecting cable hinders between the online measurement battery The device power supply of value.
- 4. the device of connecting cable resistance between online measurement battery according to claim 2, it is characterised in that institute State the one end of battery voltage sensing module (500) respectively with single-unit battery in the batteries (800) and pass through isolation resistance Connect with a switch, be grounded after the switch of other end connection one of the single-unit battery.
- 5. the device of connecting cable resistance between online measurement battery according to claim 4, it is characterised in thatThe battery voltage sensing module (500), the voltage cable detection module (200) and the single-unit battery and described Switch between cable is electronic switch, is connected with the processor, and the control instruction for receiving the processor output connects Logical or shut-off.
- 6. the device of connecting cable resistance between online measurement battery according to claim 5, it is characterised in that institute The device of connecting cable resistance also includes between stating online measurement battery：Communication module (700), is communicated to connect with the processor (400), and the processor (400) passes through the communication module (700) data are sent or receive data.
- 7. a kind of method of connecting cable resistance between online measurement battery, it is characterised in that comprise the steps：Batteries (800) are controlled to discharge by discharge module (100), until discharge current is stable；When discharge current is stable, voltage cable detection module (200) samples two adjacent sections electric power storage in the batteries (800) The voltage at connecting cable both ends between pond, and be the first signal output to processor by the photovoltaic conversion at the cable both ends (400)；When discharge current is stable, current detection module (300) samples the discharge current of the batteries (800), and by institute State discharge current and be converted into secondary signal and export to the processor (400)；The processor (400) by first signal and the secondary signal, be converted into corresponding to the cable both ends electricity Pressure value and the discharge current value, calculate the resistance of the cable.
- 8. the method for connecting cable resistance between online measurement battery according to claim 7, it is characterised in that also Comprise the steps：S110, when the batteries (800) are discharged, battery voltage acquisition module (500) sampling electric discharge when, electric discharge shut-off when The voltage at first segment battery both ends is simultaneously converted into the 3rd 1 signal, the 4th 1 signal output to the processor (400), described The electric current of first segment battery is converted into the 2nd 1 signal output to the processor during current detection module (300) sampling electric discharge (400)；S120, discharged again to the batteries (800), when battery voltage acquisition module (500) sampling is discharged, discharge and close When disconnected the voltage at next section battery both ends and be converted into the 3rd binary signal, the 4th binary signal is exported to the processor (400), The electric current of next section battery is converted into the second binary signal and exported to institute during current detection module (300) the sampling electric discharge State processor (400)；S130, when judging final section battery discharging and during electric discharge shut-off both ends voltage, and electric current during electric discharge whether Completion is sampled, if it is not, then returning to step S120；Also comprise the steps：The processor (400) according to electric discharge when and electric discharge turn off when the batteries (800) two The magnitude of voltage at end, and discharge current value calculate the internal resistance value of the batteries (800).
- 9. the method for connecting cable resistance between online measurement battery according to claim 8, it is characterised in thatWhen the battery voltage sensing module (500) the connection batteries (800), start to sample the batteries (800) during voltage, then the connection of the voltage cable detection module (200) and the batteries (800) is disconnected.
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| US10295584B2 (en) * | 2016-09-14 | 2019-05-21 | Johnson Controls Technology Company | Systems and methods for measuring isolation resistance |
| CN106546822B (en) * | 2016-10-26 | 2019-04-05 | 珠海市魅族科技有限公司 | Impedance detection method, chip and the mobile terminal of the charging circuit of load |
| CN108594130A (en) * | 2018-04-27 | 2018-09-28 | 广东电网有限责任公司 | A kind of power transformation station battery movable type whole group test device and its test method |
| CN112230166A (en) * | 2020-03-31 | 2021-01-15 | 蜂巢能源科技有限公司 | Module harness on-off test device and method and module offline test system |
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