Lithium battery module integrated cover plate assembly

Abstract

The utility model discloses a lithium battery module integrated cover plate assembly which comprises an integrated cover plate, the integrated cover plate comprises a PCB (printed circuit board) and a plurality of same busbars, and the busbars are fixedly connected to the PCB at equal intervals; the upper end surface of the integrated cover plate is fixedly connected with a collection device; the acquisition device comprises a voltage acquisition device and a temperature acquisition device. The voltage acquisition device is integrated on the PCB, so that the production efficiency of the lithium battery PACK is improved, and the product reject ratio caused by manual operation is reduced; the temperature acquisition device is integrated on the PCB, independent temperature detection is replaced, and the accuracy and real-time performance of temperature sampling are improved.

Description

Technical Field

[0001] The utility model relates to an integrated cover plate assembly, in particular to an integrated cover plate assembly for a lithium battery module. Background Art

[0002] Lithium battery PACK is the core component of the energy storage system, and the manufacturing process of the lithium battery module inside the lithium battery PACK determines the performance, safety and reliability of the lithium battery system.

[0003] In the lithium battery PACK manufacturing process, the collection of lithium battery module cell voltage and temperature is an indispensable link. The existing process collects voltage through the wiring harness terminal connection or the wiring harness and nickel sheet welding, and collects temperature without an independent temperature sensor probe. There are the following defects:

[0004] 1. The workload is large, the production efficiency is low, and the potential failure mode has high temperature and low detection, which reduces the stability of the product;

[0005] Second, the fixed position of the independent temperature sensor is far away from the battery cell body, and the detected temperature is the ambient temperature inside the lithium battery PACK, rather than the real-time temperature of the battery cell, which reduces the safety of the system. Utility Model Content

[0006] In order to solve the deficiencies existing in the above-mentioned technologies, the utility model provides a lithium battery module integrated cover plate assembly.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is a lithium battery module integrated cover assembly, including an integrated cover, the integrated cover includes a PCB board and a plurality of identical busbars, the busbars are equidistant and fixedly connected to the PCB board; the upper end surface of the integrated cover is fixedly connected with a collection device;

[0008] The collection device includes a voltage collection device and a temperature collection device; a nickel sheet is arranged below the voltage collection point in the voltage collection device so that the voltage collection device and the battery cell are connected in series and parallel to the busbar; the lower end surface of the thermistor in the temperature collection device is provided with UV glue to be glued and fixed on the busbar.

[0009] Furthermore, the lower end of the busbar is welded with a cell pole in the PCB board to fix the connection to the PCB board.

[0010] Furthermore, the outside of the integrated cover is coated with a PET film to enhance the connection strength between the busbar and the PCB board.

[0011] Furthermore, one end of the nickel sheet is soldered to the copper foil of the PCB board, and the other end of the nickel sheet is pulse welded to the battery cell to connect the busbar in series and parallel.

[0012] Furthermore, a plurality of test holes are provided on the PCB board for testing the negative case voltage of the battery cell after welding the integrated cover plate.

[0013] Furthermore, an extension structure is provided on the busbar.

[0014] Furthermore, the middle section of the busbar is arranged to be arched to reduce the influence of the expansion of the battery cell on the integrated cover.

[0015] Furthermore, a fuse and a spare fuse are provided at the voltage collection line in the voltage collection device.

[0016] Furthermore, the busbar in the integrated cover plate is an aluminum busbar, and the outer surface of the aluminum busbar is plated with nickel to prevent oxidation corrosion between the aluminum busbar and the external copper busbar.

[0017] Furthermore, one end of the integrated cover plate is plugged with a plurality of connectors for connecting active electrical appliances, and a side of the connector plugged with the integrated cover plate is provided with a plurality of PIN pins.

[0018] The utility model discloses a lithium battery module integrated cover assembly. By integrating a voltage acquisition device on a PCB circuit board, the production efficiency of lithium battery PACK is improved, and the product defect rate caused by manual work is reduced; by integrating a temperature acquisition device on a PCB circuit board, independent temperature detection is replaced, and the accuracy and real-time performance of temperature sampling are improved; by designing an extended structure of the busbar, the influence of battery cell bulging on the integrated cover is reduced; by adding a fuse to the voltage sampling circuit, the probability of BMU damage is reduced; by performing a nickel plating process on the busbar, the problem of contact oxidation corrosion of aluminum and copper is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Figure 2 It is the front view of the utility model.

[0021] Figure 3 It is a schematic diagram of the bottom view of the present invention.

[0022] Figure 4 It is a schematic diagram of the collection device in the utility model.

[0023] Figure 5 It is the front view of the connector in the utility model.

[0024] Figure 6 It is a right side view of the connector in the present utility model.

[0025] In the figure: 1. integrated cover; 2. fuse; 3. nickel sheet; 4. collection device; 5. test hole; 6. PIN needle; 7. connector; 101. busbar; 102. PCB board; 401. voltage collection device; 402. temperature collection device. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] A lithium battery module integrated cover assembly, comprising an integrated cover 1, such as Figure 1 As shown in the overall structural diagram of a lithium battery module integrated cover assembly, the integrated cover 1 includes a PCB board 102 and a plurality of identical busbars 101, and the busbars 101 are equidistant and fixedly connected to the PCB board 102; the upper end surface of the integrated cover 1 is fixedly connected to a collection device 4;

[0028] The collection device 4 includes a voltage collection device 401 and a temperature collection device 402; a nickel sheet 3 is arranged below the voltage collection point in the voltage collection device 401 to facilitate the voltage collection device 401 to be connected in series and parallel with the battery cell to the busbar 101; UV glue is arranged on the lower end surface of the thermistor in the temperature collection device 402 to be glued and fixed to the busbar 101.

[0029] Specifically, the lower end of the busbar 101 is welded with a battery pole in the PCB board 102 to fix the connection to the PCB board 102. The outside of the integrated cover plate 1 is coated with a PET film to strengthen the connection strength between the busbar 101 and the PCB board 102. One end of the nickel sheet 3 is soldered to the copper foil of the PCB board 102, and the other end of the nickel sheet 3 is pulse welded to the battery cell to connect the busbar 101 in series and parallel. A number of test holes 5 are provided on the PCB board 102 for testing the negative shell voltage of the battery cell after welding the integrated cover plate 1. An extension structure is provided on the busbar 101. The middle section of the busbar 101 is set to an arch to reserve a delay dimension and thereby reduce the impact of the battery cell expansion on the integrated cover plate 1. A fuse 2 and a spare fuse are provided at the voltage collection line in the voltage collection device 401 of the battery cell to reduce damage to the single battery management unit BMU. The busbar 101 in the integrated cover plate 1 is an aluminum busbar, and the outer surface of the positive and negative aluminum busbars is plated with nickel to prevent oxidation corrosion between the positive and negative aluminum busbars and the external copper busbars. One end of the integrated cover plate 1 is plugged with a plurality of connectors 7 to connect active electrical appliances, and a plurality of PIN pins 6 are provided on one side of the connector 7 plugged into the integrated cover plate 1.

[0030] This embodiment provides a specific connection method for a lithium battery module integrated cover assembly; a lithium battery module integrated cover assembly, such as Figure 2As shown in the front view of a lithium battery module integrated cover assembly, it includes an integrated cover 1, the integrated cover 1 includes a PCB board 102 and a plurality of identical busbars 101, the busbars 101 are equidistant and fixedly connected to the PCB board 102, the lower end of the busbar 101 is welded with a battery cell pole in the PCB board 102, and the outside of the integrated cover 1 is coated with a PET film to strengthen the connection strength between the busbar 101 and the PCB board 102. When the busbar 101 and the PCB board 102 are coated with the PET film, it is necessary to reserve the welding position of the busbar 101 and the battery cell pole, which not only strengthens the overall structural performance of the integrated cover 1 and reduces the risk of damage to the integrated cover 1 during operation and operation, but also reduces the exposed area of ​​the busbar 101 and the PCB board 102, and reduces the risk of short circuit of the lithium battery module during operation; a withstand voltage standard is set between the busbar 101 and the PET film, and the withstand voltage standard is an AC voltage of 2500V and lasts for 60 seconds, and the leakage current is less than 1mA to ensure the process quality of the integrated cover 1. The upper end surface of the integrated cover plate 1 is fixedly connected with a collection device 4; Figure 4 As shown in a schematic diagram of a collection device in a lithium battery module integrated cover assembly, the collection device 4 includes a voltage collection device 401 and a temperature collection device 402; the voltage collection line and the voltage collection point in the voltage collection device 401 are integrated on the PCB board 102, and a nickel sheet 3 is arranged below the voltage collection point in the voltage collection device 401 to connect the busbar 101 in series and parallel with the battery cell, one end of the nickel sheet 3 is soldered to the copper foil of the PCB board 102, and the other end of the nickel sheet 3 is pulse welded to the battery cell to connect the busbar 101 in series and parallel; a welding resistance requirement is set between the nickel sheet 3 and the busbar 101, and the welding resistance requirement is that the welding resistance is not more than 60μΩ to ensure the process quality of the integrated cover plate 1. By this method, the method of collecting voltage by wiring harness connection is abandoned. The voltage collection device 401 is fixedly connected to the PCB board 102 and the busbar 101, which can advance the voltage collection process to the upstream supplier, and the relevant processes in the lithium battery PACK process can be omitted; the lower end surface of the thermistor in the temperature collection device 402 is provided with UV glue to be glued and fixed to the busbar 101. The thermistor is directly fixed to the busbar 101, so that the heat of the battery cell can be transferred to the thermistor faster, improving the accuracy and real-time performance of the battery cell temperature collection, and conveniently adding temperature sampling points. Compared with the independent temperature collection temperature probe placed above the lithium battery module, the collected temperature is not the real-time temperature of the battery cell, but the ambient temperature in the battery pack, which improves the lag and distortion of temperature detection. A number of test holes 5 are opened on the PCB board 102 for testing the negative shell voltage of the battery cell after welding the integrated cover plate 1. The negative shell voltage test refers to the voltage between the negative electrode of the lithium battery and the lithium battery shell. During the use of the lithium battery module, the thickness of the battery cell will expand to a certain extent, which will cause tension and tearing of the busbar 101. An extension structure is provided in the middle of the busbar 101, such as Figure 3As shown in the schematic diagram of the top view of the integrated cover assembly of a lithium battery module, the middle section of the busbar 101 is set to an arch shape to reserve an extended size and thereby reduce the impact of the battery cell expansion on the integrated cover 1. In the voltage collection device 401 of the battery cell, a fuse 2 and a spare fuse are provided at the voltage collection line to reduce damage to the single battery management unit BMU. The busbar 101 in the integrated cover 1 is an aluminum busbar, and the outer surfaces of the positive and negative aluminum busbars are plated with nickel to avoid oxidation corrosion between the positive and negative aluminum busbars and the external copper busbars. Two connectors 7 are plugged into one end of the integrated cover 1 to connect active devices, such as Figure 5 As shown in the front view of the connector in the integrated cover assembly of a lithium battery module, a plurality of PIN pins 6 are arranged on one side of the connector 7 plugged into the integrated cover 1, such as Figure 6 As shown in the right view of the connector in a lithium battery module integrated cover assembly, the connector 7 of this embodiment is provided with 32 PIN pins 6 on one side of the integrated cover plate 1, and insulation standards are provided between each two of the PIN pins 6. The insulation standard is a DC voltage of 500V and lasts for 2 seconds, and the insulation value is not less than 500MΩ to ensure the process quality of the integrated cover plate 1.

[0031] A lithium battery module integrated cover assembly integrates a busbar 101 connected in series and parallel to a battery cell, collects the voltage of the battery cell, uses a fuse 2 on the battery cell for a voltage collection circuit, and detects the temperature of the battery cell, thereby replacing the voltage collection of the traditional wiring harness connection method and the independent temperature detection, reducing the manual workload of the lithium battery PACK process, reducing the defect rate caused by manual work, and improving the quality of the product; the setting of the fuse 2 in the voltage collection circuit reduces the probability of damage to the single battery management unit BMU; the use of a thermistor fixed to the busbar 101 connected in series and parallel by UV glue for temperature detection can detect the temperature of the battery cell faster and more accurately.

[0032] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A lithium battery module integrated cover plate assembly, comprising an integrated cover plate (1), characterized in that: The integrated cover plate (1) comprises a PCB board (102) and a plurality of identical busbars (101), wherein the busbars (101) are equidistantly and fixedly connected to the PCB board (102); a collection device (4) is fixedly connected to the upper end surface of the integrated cover plate (1); The collection device (4) comprises a voltage collection device (401) and a temperature collection device (402); a nickel sheet (3) is provided below the voltage collection point in the voltage collection device (401) so as to facilitate the voltage collection device (401) and the battery cell to be connected in series and parallel to the busbar (101); and UV glue is provided on the lower end surface of the thermistor in the temperature collection device (402) so as to be glued and fixed to the busbar (101).

2. The lithium battery module integrated cover assembly according to claim 1, characterized in that: The lower end of the busbar (101) is welded with a cell pole in the PCB board (102) to fix the connection with the PCB board (102).

3. The lithium battery module integrated cover assembly according to claim 1, characterized in that: The outside of the integrated cover plate (1) is coated with a PET film to enhance the connection strength between the busbar (101) and the PCB board (102).

4. The lithium battery module integrated cover assembly according to claim 1, characterized in that: One end of the nickel sheet (3) is soldered to the copper foil of the PCB board (102), and the other end of the nickel sheet (3) is pulse-welded to the battery cell to connect the busbar (101) in series and parallel.

5. The lithium battery module integrated cover assembly according to claim 1, characterized in that: The PCB board (102) is provided with a plurality of test holes (5) for testing the negative case voltage of the battery cell after welding the integrated cover plate (1).

6. The lithium battery module integrated cover assembly according to claim 1, characterized in that: The busbar (101) is provided with an extension structure.

7. The lithium battery module integrated cover assembly according to claim 6, characterized in that: The middle section of the busbar (101) is arranged in an arched shape to reduce the effect of the expansion of the battery cell on the integrated cover plate (1).

8. The lithium battery module integrated cover assembly according to claim 1, characterized in that: A fuse (2) and a spare fuse are provided at the voltage collection line in the voltage collection device (401).

9. The lithium battery module integrated cover assembly according to claim 1, characterized in that: The busbar (101) in the integrated cover plate (1) is an aluminum busbar, and the outer surface of the aluminum busbar is plated with nickel to prevent oxidation corrosion between the aluminum busbar and the external copper busbar.

10. The lithium battery module integrated cover assembly according to claim 1, characterized in that: One end of the integrated cover plate (1) is plugged with a plurality of connectors (7) for connecting to active electrical appliances, and a side of the connector (7) plugged with the integrated cover plate (1) is provided with a plurality of PIN pins (6).

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