Battery module testing tool

Abstract

The utility model discloses a battery module testing tool, and relates to the technical field of battery testing. The battery module test tool comprises an acquisition module, a power supply module and a switch, a signal input end of the acquisition module is connected with a signal output end of a terminal through an acquisition wire harness, and a signal input end of the terminal is connected with a sensor and / or a CCS of a battery module to be tested and is used for acquiring the temperature of the battery module and the voltage of a battery cell string; the acquisition wire harness comprises a plurality of acquisition wires which are respectively used for acquiring temperature and voltage of the battery cell string, and the switch is arranged among the acquisition wires and is used for short-circuiting part of the acquisition wires when the acquisition wires do not need to be used for acquisition. According to the utility model, matched wire harnesses do not need to be manufactured according to different modules, and the test of the battery module can be realized only by butting the wire led out from the module end with the plate end, so that the battery module testing device has the advantage of convenience in operation. The device can be compatible with voltage and temperature acquisition of 7-26 strings of battery cells, and has the advantages of wide application range and simple operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery test technical field, and specifically points to a kind of battery module test tool. BACKGROUND

[0002] Before battery module is assembled into complete battery pack, it is crucial to ensure the functional integrity and performance stability of each battery module. In this step, detailed acquisition test is an indispensable link to single battery module, aiming at preventing CCS (Cell Control System, i.e. battery unit control system) damage that may occur in welding process, or acquisition signal failure caused by other potential factors, etc. Once these problems are not found and repaired in time, it may lead to overall performance decline or frequent failure after battery packing box.

[0003] At present, the method widely used in industry is to use specially designed BMS (Battery Management System, i.e. battery management system) board and matched acquisition wiring harness to perform this checking task. As the core component of battery management system, BMS board is responsible for monitoring various key parameters of battery module, such as voltage, current, temperature, etc., and is connected with sensors inside battery module and CCS through acquisition wiring harness, to realize real-time monitoring and evaluation of module assembly state and performance.

[0004] However, this method faces two major challenges in practical application:

[0005] Firstly, due to the differences in design and functional requirements of different battery modules, the number of voltage and temperature acquisition points required by them is different, and the pin definition of CCS output at module end is also not exactly the same. This means that every time a new module type is faced, a set of matched wiring harness needs to be customized to adapt to its specific pin arrangement and signal transmission requirements. This practice not only increases production cost, but also makes the management and maintenance of wiring harness extremely complex.

[0006] Secondly, since different modules require different test wiring harnesses, test personnel need to accurately find out the one suitable for the current module from a large number of mixed wiring harnesses each time. This process not only consumes time and effort, but also is prone to error. Once the wrong wiring harness is found, not only the test cannot be completed, but also unnecessary damage to the module may be caused. Such low adaptability and operation convenience seriously restricts the improvement of test efficiency.

[0007] In summary, although the current battery module acquisition test technology meets the production requirements to a certain extent, it still needs to be further improved and optimized in terms of wiring harness versatility and test operation convenience. UTILITY MODEL CONTENT

[0008] In order to overcome the above technical deficiencies, the utility model discloses a battery module test tool, solve the operation complex of battery module test process in prior art causes the problem of low test efficiency.

[0009] In order to realize the above object, the utility model adopts the technical scheme as follows:

[0010] A kind of battery module test tool, it is special in that, including acquisition module, power module and switch, the input end of power module is connected with commercial power, output end is connected with the acquisition module, for converting commercial power into direct current to power the acquisition module;The signal input end of the acquisition module is connected with the signal output end of terminal by acquisition harness, the signal input end of the terminal is connected with the sensor and / or CCS of battery module to be measured, for acquiring the temperature and cell string voltage of battery module;The acquisition harness includes multiple acquisition lines, is respectively used to acquire temperature and cell string voltage, the switch is arranged between the acquisition line, for when not needing to use part of acquisition line to carry out acquisition, this part of acquisition line is short-circuited.

[0011] As preferred scheme, still include connector, one end of the connector is detachably connected with the signal input end of the terminal by first female head, the other end is detachably connected with the second female head on the battery module by male head, so that the signal input end of the terminal is connected with the sensor and / or CCS of the battery module.In use, the signal input end of the terminal is connected with the first female head, the male head is connected with the second female head on the battery module, the connector connects the line from tool end and the line from module end, and the signal from CCS in the battery module is transported to the acquisition module via the connector and terminal. The second female head is provided on the battery module, and the second female head is connected with the CCS. Through the conversion of terminal and connector, it is not necessary to make matching harness according to different modules, just need to connect the line from module end and the line from board end through the connector, reduce the complexity of test process, make the test process more simple, and more efficient.

[0012] As a preferred solution, the terminals include at least one of 16P, 24P, 28P, 32P, and 40P. One or more terminals can be set according to actual conditions to complete information collection of different battery modules and expand the application range of the test tool. During battery module testing, only one of the terminals is used. Among them, the 16P terminal is suitable for collecting battery modules with no more than 3 temperatures of 7-9 strings of battery cells, the 24P terminal is suitable for collecting battery modules with no more than 3 temperatures of 9-14 strings of battery cells, the 28P terminal is suitable for collecting battery modules with no more than 3 temperatures of 15-18 strings of battery cells, the 32P terminal is suitable for collecting battery modules with no more than 3 temperatures of 14-22 strings of battery cells, and the 40P terminal is suitable for collecting battery modules with no more than 6 temperatures of 14-26 strings of battery cells.

[0013] As a preferred solution, the collection module is provided with a temperature signal input end and a voltage signal input end; the collection harness includes temperature collection lines and voltage collection lines; the temperature signal input end on the collection module is provided with one or more, and each temperature signal input end is connected to the corresponding temperature signal output end on the corresponding terminal through the corresponding temperature collection line; the voltage signal input end on the collection module is provided with a plurality of, and each voltage signal input end is connected to the corresponding voltage signal output end on the corresponding terminal through the corresponding voltage collection line.

[0014] Further, the switch is provided with one or more, and the switch is arranged between adjacent voltage collection lines to short the redundant voltage collection lines during collection.

[0015] As a preferred solution, the collection module is a BMS board including an AFE chip.

[0016] After the collection lines for transmitting the same kind of signal at the same position on the battery module on different terminals are connected to each other, the collection lines are connected to the signal input end on the collection module for receiving the corresponding signal. The collection lines for outputting the same kind of temperature signal on each terminal are connected to each other, and finally connected to the corresponding temperature signal input end on the collection module by one collection line. The temperature signal includes the surface temperature of the battery cell, the temperature of the module end plate, etc. For example, the collection lines for outputting the surface temperature of the battery cell on different terminals are connected to each other and then connected to one collection line to connect the signal input end on the collection module for receiving the surface temperature signal of the battery cell. Similarly, the collection lines for outputting the same voltage signal on each terminal are connected to each other, and finally connected to the corresponding voltage signal input end on the collection module by one collection line.

[0017] As a preferred solution, the AFE chip includes 14 voltage signal input ends and 6 temperature signal input ends for collecting the voltage of up to 14 strings of battery cells and 6 temperatures.

[0018] Further, the terminals are provided with five terminals of 16P, 24P, 28P, 32P and 40P; three temperature acquisition lines are connected to the terminals of 16P, 24P, 28P and 32P for outputting different temperature signals, and six temperature acquisition lines are provided on the terminal of 40P for outputting different temperature signals; the temperature acquisition lines outputting the same temperature signal on each terminal are connected to each other and connected to the corresponding temperature signal input end on the acquisition module.

[0019] Further, the BMS board comprises at least two AFE chips, and the temperature signal output ends on the five terminals are connected to the corresponding temperature signal input ends on the AFE chips through the temperature acquisition lines; each voltage signal input end of one of the AFE chips is connected to the corresponding voltage signal output ends of all the terminals through the corresponding voltage acquisition lines, for acquiring the voltage of up to 14 series of battery cells; each voltage signal input end of the other AFE chip is connected to the corresponding voltage signal output ends on the terminals of 28P, 32P and 40P through the corresponding voltage acquisition lines; on the AFE chip, switches are arranged between adjacent voltage acquisition lines among the voltage acquisition lines connected to the fourth to twelfth voltage signal input ends, for short-circuiting the redundant voltage acquisition lines during acquisition. Since 28P, 32P and 40P need to acquire more than 14 series of battery cells, two AFE chips are needed. Each AFE can acquire up to 6 temperatures of 14 series of battery cells, but there also exists a battery module with less than 14 series of battery cells, so the acquisition lines need to be short-circuited to adapt to the acquisition of different numbers of battery cells; the first four (B1, B2, B3 and B4) and the last three voltage acquisition lines (B12, B13 and B14) on each AFE chip need to be separately acquired and cannot be short-circuited, and the remaining voltage acquisition lines are connected to each other through the switches. For example, if the existing module has only 9 series of battery cells to be acquired, the 16P terminal is used, and the switches between the 5 voltage signal acquisition lines on the 16P terminal are closed to meet the acquisition requirement; in this way, different module test requirements can be met.

[0020] As a preferred scheme, the signal output end of the acquisition module is connected to the PC end through the CAN box, for outputting the acquired voltage and temperature information. Through the connection with the PC end, the output of the acquired information can be realized, the acquisition result is more intuitive, and the data analysis for the analysis system can be provided, so that the safety of the assembled battery is improved.

[0021] Compared with the prior art, the battery module test tool has the advantages that:

[0022] The battery module test tool provided by the utility model has the advantages that the test of the battery module can be realized by only connecting the lines led out of the module end to the board end, without the need of manufacturing the matching wire harness according to different modules, and the operation is convenient; the utility model can be compatible with the voltage and temperature acquisition of 7-26 series of battery cells, and has the advantages of wide application range and simple operation. Attached Figure Description

[0023] Figure 1 This is a connection diagram of a battery module testing fixture according to the present invention;

[0024] Figure 2 This is a data acquisition diagram of the 16P terminal in a battery module testing fixture of this utility model;

[0025] In the diagram: 1. Acquisition module; 2. Power module; 3. Switch; 4. Acquisition harness; 5. Terminal; 6. Battery module; 7. Male connector; 8. Connector; 9. CAN box; 10. First female connector; 11. Second female connector. Detailed Implementation

[0026] To better explain this utility model, the main contents of this utility model are further illustrated below with reference to specific embodiments, but the contents of this utility model are not limited to the following embodiments.

[0027] A battery module testing fixture includes a data acquisition module 1, a power supply module 2, and a switch 3. The input terminal of the power supply module 2 is connected to AC power, and the output terminal is connected to the data acquisition module 1 to convert AC power into DC power to power the data acquisition module 1. The signal input terminal of the data acquisition module 1 is connected to the signal output terminal of the terminal 5 through a data acquisition harness 4. The signal input terminal of the terminal 5 is connected to the sensor and / or CCS of the battery module 6 under test to acquire the temperature and cell series voltage of the battery module 6. The data acquisition harness 4 includes multiple data acquisition lines, which are used to acquire the temperature and cell series voltage respectively. The switch 3 is disposed between the data acquisition lines to short-circuit a portion of the data acquisition lines when no data acquisition is required.

[0028] The battery module test tool further comprises a connector 8, one end of the connector 8 is detachably connected with the signal input end of the terminal 5 through the first female connector 10, and the other end is detachably connected with the second female connector 11 on the battery module 6 through the male connector 7, so as to connect the signal input end of the terminal 5 with the sensor and / or the CCS of the battery module 6. In use, the signal input end of the terminal 5 is connected with the first female connector 10, the male connector 7 is connected with the second female connector 11 on the battery module 6, and the connector 8 connects the lines led out from the tool end with the lines led out from the module end, so as to transmit the signals from the CCS inside the battery module 6 to the acquisition module 1 through the connector 8 and the terminal 5. The second female connector 11 is arranged on the battery module 6 and connected with the CCS. Through the conversion of the terminal 5 and the connector 8, it is not necessary to make a matching wire harness according to different modules, but only to connect the lines led out from the module end with the lines led out from the board end through the connector 8, so as to reduce the complexity of the test process and make the test process simpler and more efficient. The connector 8, the first female connector 10 and the male connector 7 are all detached when the battery module 6 test tool is not used for testing, and are installed when the battery module 6 is tested.

[0029] The power module 2 comprises a transformer and a rectifier, the input end of the transformer is connected with the commercial power, and the output end is connected with the rectifier, so as to convert the commercial power into low-voltage alternating current and output to the rectifier. The rectifier is connected with the acquisition module 1, converts the low-voltage alternating current into low-voltage direct current, and supplies power to the acquisition module 1. The output voltage of the power module 22 is 12V or 24V.

[0030] The acquisition module 1 is provided with temperature signal input ends and voltage signal input ends; the acquisition wire harness 4 comprises temperature acquisition lines and voltage acquisition lines; the temperature signal input ends on the acquisition module 1 are provided with one or more, and the temperature signal input ends are connected with the corresponding temperature signal output ends on the corresponding terminal 5 through the corresponding temperature acquisition lines; the voltage signal input ends on the acquisition module 1 are provided with one or more, and the voltage signal input ends are connected with the corresponding voltage signal output ends on the terminal 5 through the corresponding voltage acquisition lines. The switch 3 is provided with a plurality of switches 3, which are arranged between adjacent voltage acquisition lines to short the redundant voltage acquisition lines during acquisition. The signal output end of the acquisition module 1 is connected with the PC end through the CAN box 9, and is used to output the acquired voltage and temperature information.

[0031] Specifically, the acquisition module 1 is a BMS board and comprises an AFE chip. The AFE chip comprises 14 voltage signal input ends and 6 temperature signal input ends, and is used to acquire the voltage of a maximum of 14 strings of battery cells and six temperatures. Specifically, the AFE chip is an SC33771 chip.

[0032] The terminal 5 is provided with five terminals 5 of 16P, 24P, 28P, 32P and 40P, only one of which is used when the battery module 6 is tested. Among them, the terminal 5 of 16P is suitable for collecting the battery module 6 with no more than 3 temperature of 7-9 series of battery cells, the terminal 5 of 24P is suitable for collecting the battery module 6 with no more than 3 temperature of 9-14 series of battery cells, the terminal 5 of 28P is suitable for collecting the battery module 6 with no more than 3 temperature of 15-18 series of battery cells, the terminal 5 of 32P is suitable for collecting the battery module 6 with no more than 3 temperature of 14-22 series of battery cells, and the terminal 5 of 40P is suitable for collecting the battery module 6 with no more than 6 temperature of 14-26 series of battery cells. The terminal 5 of 16P, 24P, 28P and 32P is connected with three temperature collection lines for outputting different temperature signals, and the terminal 5 of 40P is provided with six temperature collection lines for outputting different temperature signals; the temperature collection lines outputting the same temperature signal on each terminal 5 are connected with each other and connected with the corresponding temperature signal input end on the collection module 1. The temperature signal includes the surface temperature of the battery cell, the module end plate temperature and the like, for example: the collection lines outputting the surface temperature of the battery cell on different terminals 5 are connected with each other and then connected to a collection line to connect the signal input end of the collection module 1 receiving the surface temperature signal of the battery cell. Similarly, the collection lines outputting the same voltage signal on each terminal 5 are connected with each other, and finally connected to the corresponding voltage signal input end on the collection module 1 by a collection line.

[0033] The above BMS board includes three AFE chips, and only two of which are used in the tooling. Each voltage signal input end of one of the AFE chips is connected with the corresponding voltage signal output end of all the terminals 5 through the corresponding voltage collection line, for collecting the voltage of up to 14 series of battery cells; each voltage signal input end of the other AFE chip is connected with the corresponding voltage signal output end on the terminals 5 of 28P, 32P and 40P through the corresponding voltage collection line; among the voltage collection lines connected with the 4th to 12th voltage signal input end on the AFE chip, switches 3 are arranged between adjacent collection lines to short the redundant voltage collection lines when collecting. The temperature signal output ends on the five terminals 5 are connected with the corresponding temperature signal input end on one or more AFE chips through the temperature collection line.

[0034] As Figure 2As shown, taking one AFE chip connected to the 16P terminal 5 as an example, the voltage signal input end of the AFE chip is connected to the corresponding voltage signal output end on the 16P terminal 5 through the B1+ collection line, the B2+ collection line, the B3+ collection line, the B4+ collection line, the B5+ collection line, the B6+ collection line, the B7+ collection line, the B8+ collection line, the B9+ collection line, the B10+ collection line, the B11+ collection line, the B12+ collection line, the B13+ collection line, and the B14+ collection line. The collection lines are arranged in sequence to transmit the cell string voltage signal of the battery module 6.

[0035] The B1+ collection line is arranged on each of the other terminals 5 to output the first string cell voltage of the battery module 6. The B1+ collection lines on all the terminals 5 are connected to each other, and finally gathered on one B1+ collection line and connected to the voltage signal input end of the AFE chip on the collection module 1, so that the first string cell voltage of the battery module 6 can be tested when any terminal 5 is used to test the battery module 6. In the voltage collection line, from the B4+ collection line to the B12+ collection line, a switch 3 is arranged between adjacent collection lines to short the redundant voltage collection lines during collection. The AFE chip can collect up to 14 string cells 6 temperatures, but there are also less than 14 string battery modules 6. To adapt to the collection needs of different cell numbers, the collection lines need to be shorted. The collection module 1 collects at least 7 string cells, and the first four collection lines B1, B2, B3, and B4 and the last three collection lines B12, B13, and B14 need to be collected separately and cannot be shorted. The remaining voltage sampling lines are connected through the switch 3. For example, when the 16P terminal 5 is used to collect the battery module 6 composed of 7 string cells, only 7 string cells need to be collected, so the switch 3 needs to be closed to short the B5+ to B11+ to meet the collection needs. In this way, different module test requirements can be met.

[0036] Each voltage signal input end of the other AFE chip is connected to the corresponding voltage signal output end on the 28P, 32P, and 40P terminals 5. The voltage signal output ends on the 28P, 32P, and 40P terminals 5 are also provided with 14 voltage collection lines, and from the fourth voltage collection line to the twelfth voltage collection line, a switch 3 is arranged between adjacent collection lines. When more than 14 string cells need to be collected, two AFE chips are used at the same time, and one of the 28P, 32P, and 40P terminals 5 is used for collection at this time.

Claims

1. A battery module testing fixture, characterized in that: The system includes a data acquisition module (1), a power supply module (2), and a switch (3). The input terminal of the power supply module (2) is connected to the mains power, and the output terminal is connected to the data acquisition module (1) to convert the mains power into DC power to power the data acquisition module (1). The signal input terminal of the data acquisition module (1) is connected to the signal output terminal of the terminal (5) through the data acquisition harness (4). The signal input terminal of the terminal (5) is connected to the sensor and / or CCS of the battery module (6) under test to acquire the temperature and cell series voltage of the battery module (6). The data acquisition harness (4) includes multiple data acquisition lines, which are used to acquire the temperature and cell series voltage respectively. The switch (3) is set between the data acquisition lines to short-circuit the data acquisition lines when it is not necessary to use some of the data acquisition lines for acquisition.

2. The battery module testing fixture according to claim 1, characterized in that: It also includes a connector (8), one end of which is detachably connected to the signal input terminal of the terminal (5) via a first female connector (10), and the other end is detachably connected to the first female connector (11) on the battery module (6) via a male connector (7), thereby connecting the signal input terminal of the terminal (5) to the sensor and / or CCS of the battery module (6).

3. The battery module testing fixture according to claim 1, characterized in that: The terminal (5) includes at least one of 16P, 24P, 28P, 32P, and 40P.

4. The battery module testing fixture according to claim 1, characterized in that: The acquisition module (1) is provided with a temperature signal input terminal and a voltage signal input terminal; the acquisition harness (4) includes a temperature acquisition line and a voltage acquisition line; the acquisition module (1) is provided with one or more temperature signal input terminals, and each temperature signal input terminal is connected to the corresponding temperature signal output terminal on the corresponding terminal (5) through the corresponding temperature acquisition line; the acquisition module (1) is provided with multiple voltage signal input terminals, and each voltage signal input terminal is connected to the corresponding voltage signal output terminal on the corresponding terminal (5) through the corresponding voltage acquisition line.

5. The battery module testing fixture according to claim 4, characterized in that: One or more switches (3) are provided, and the switches (3) are located between adjacent voltage acquisition lines to short-circuit the excess voltage acquisition lines during acquisition.

6. The battery module testing fixture according to claim 5, characterized in that: The acquisition module (1) is a BMS board, including an AFE chip.

7. The battery module testing fixture according to claim 6, characterized in that: The AFE chip includes 14 voltage signal input terminals and 6 temperature signal input terminals, used to collect the voltage of up to 14 battery cells and 6 temperatures.

8. The battery module testing fixture according to claim 7, characterized in that: The terminal (5) is provided with five terminals, namely 16P, 24P, 28P, 32P, and 40P terminals (5); three temperature acquisition lines are connected to the 16P, 24P, 28P, and 32P terminals (5) for outputting different temperature signals, and six temperature acquisition lines are provided on the 40P terminal (5) for outputting different temperature signals; the temperature acquisition lines that output the same temperature signal on each terminal (5) are interconnected and connected to the corresponding temperature signal input terminal on the acquisition module (1).

9. The battery module testing fixture according to claim 8, characterized in that: The BMS board includes at least two AFE chips. The temperature signal output terminals on the five terminals (5) are all connected to the corresponding temperature signal input terminals on the AFE chips through temperature acquisition lines. Each voltage signal input terminal of one AFE chip is connected to the voltage signal output terminals of all terminals (5) through the corresponding voltage acquisition lines to collect the voltage of up to 14 battery cells. Each voltage signal input terminal of the other AFE chip is connected to the corresponding voltage signal output terminals on terminals 28P, 32P, and 40P through the corresponding voltage acquisition lines. On the AFE chip, among the voltage acquisition lines connected to the 4th to 12th voltage signal input terminals, a switch (3) is provided between adjacent acquisition lines to short-circuit the excess voltage acquisition lines during acquisition.

10. The battery module testing fixture according to any one of claims 1 to 9, characterized in that: The signal output terminal of the acquisition module (1) is connected to the PC terminal through the CAN box (9) to output the acquired voltage and temperature information.

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