Battery cell module for battery pack

Abstract

The utility model relates to the technical field of battery packs, in particular to a battery cell module for a battery pack, which comprises a plurality of battery cells, positive electrodes are arranged on one sides of the battery cells, negative electrodes are arranged on the other sides of the battery cells, and the battery cells are mutually crossed and horizontally stacked to form a battery cell module. The battery cell module comprises a first battery cell module electric connection edge and a second battery cell module electric connection edge which are arranged on the two sides, a first electric connection assembly is arranged on the first battery cell module electric connection edge, and a second electric connection assembly is arranged on the second battery cell module electric connection edge; and the first electric connection assembly and the second electric connection assembly have the same specification, so that stable series connection of the battery cells can be realized. The device is compact in structure, simple in wire arrangement, small in occupied space, small in dependence on manual assembly and capable of effectively improving the efficiency of automatic assembly.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a cell module for a battery pack. Background Technology

[0002] Currently, new energy vehicles have received widespread attention from all sectors of society due to their excellent environmental performance, and the requirements for them are constantly increasing. As a type of new energy vehicle, electric vehicles are also developing towards higher safety, higher energy density, and lighter weight. The main factor determining the driving range of an electric vehicle is the power supply battery. Different specifications of power supply batteries can be selected for different vehicle models to meet driving requirements.

[0003] Battery packs used in electric vehicles typically consist of multiple cell modules. These modules are stacked within the same housing and then connected to each other. The core cell module is configured with a specific number of cells to meet the required output voltage, and all the cells are then connected together to output the voltage.

[0004] In existing technologies, the arrangement of cells in battery modules is structurally complex, making it inconvenient to connect the cells in series, which seriously affects the assembly efficiency and power transmission performance of the battery module. Furthermore, to ensure the safe operation of the battery module, wiring harnesses are commonly used to collect voltage. However, traditional wiring harness acquisition requires multiple harnesses, which not only occupies a large amount of battery pack space but also relies heavily on manual labor during electrical connections, resulting in very low automation. In addition, during battery charging or discharging, if the current exceeds its rated value or design range, it may damage the battery or even cause a safety accident. Therefore, overcurrent protection is needed to ensure stable battery power supply.

[0005] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this utility model is to overcome the problems of the prior art and provide a cell module for a battery pack. This module solves the problems of complex structure and inconvenience of subsequent series power transmission when connecting cells in traditional cell modules. It also addresses the issues of multiple wire harnesses required for collecting battery cells using wire harnesses, which not only occupies a large space in the battery pack but also relies heavily on manual labor when making electrical connections. Furthermore, it addresses the technical problem of overcurrent during battery charging or discharging.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A cell module for a battery pack includes several cells, each cell having a positive electrode on one side and a negative electrode on the other. The cells are horizontally stacked and intersected to form a cell module. Each cell module includes a first cell module electrical connection edge and a second cell module electrical connection edge located on both sides. A first electrical connection component is disposed on the first cell module electrical connection edge, and a second electrical connection component is disposed on the second cell module electrical connection edge. The first and second electrical connection components are identical in specifications and both include a wire harness isolation plate. One side of the wire harness isolation plate is used to attach to either the first or second cell module electrical connection edge, and the other side has parallel aluminum bus mounting positions and flexible circuit board mounting positions. An aluminum bus is disposed on the aluminum bus mounting position, and the flexible circuit board is mounted on the aluminum bus mounting position. A flexible circuit board is provided on the mounting position. The aluminum bar is connected to the flexible circuit board through a first busbar. A connector is provided at one end of the flexible circuit board. The aluminum bar mounting position includes external aluminum bar positions on both sides and multiple positive and negative aluminum bar positions between the two external aluminum bar positions. The aluminum bar includes external aluminum bars corresponding to the external aluminum bar positions and positive and negative aluminum bars corresponding to the positive and negative aluminum bar positions. The external aluminum bar positions have external aluminum bar slots for embedding the external aluminum bars, and single-pole through slots for fitting the electrodes of a single cell are formed in the external aluminum bar slots. The positive and negative aluminum bar positions have positive and negative aluminum bar slots for embedding the positive and negative aluminum bars, and positive and negative through slots for fitting the electrodes of two cells are formed in the positive and negative aluminum bar slots.

[0009] Furthermore, the positive and negative electrode through slots include a positive electrode through slot and a negative electrode through slot disposed in the positive and negative electrode aluminum bar embedding slots. The positive electrode through slot is used for the positive electrode of a single battery cell to extend into, and the negative electrode through slot is used for the negative electrode of a single battery cell to extend into.

[0010] Furthermore, the positive and negative aluminum bars include a positive electrode connection portion that can act on the positive electrode through groove, and a negative electrode connection portion that can act on the negative electrode through groove.

[0011] Furthermore, guide posts are provided on the bottom walls of both the external aluminum bar insertion slot and the positive and negative aluminum bar insertion slots, and guide holes matching the guide posts are provided on both the external aluminum bar and the positive and negative aluminum bars.

[0012] Furthermore, copper busbars are provided on the outer side of the positive and negative aluminum bars, and the copper busbars are connected to the flexible circuit board through a second busbar.

[0013] Furthermore, the copper busbar matches the shape of the positive and negative aluminum bars and can be embedded in the grooves of the positive and negative aluminum bars.

[0014] Furthermore, adjacent cells are isolated by a pair of PC sheets.

[0015] Furthermore, the flexible circuit board mounting position is provided with several explosion-proof holes.

[0016] Furthermore, clamping end plates are respectively provided at both ends of the battery cell module.

[0017] Furthermore, a liquid cooling plate is also provided at the bottom of the battery cell module.

[0018] This utility model provides a cell module for a battery pack. Multiple cells are horizontally arranged with their positive and negative terminals crossed to form a first and a second cell module electrical connection edge. Each edge is equipped with identical electrical connection components, allowing the cells to be connected in series. This eliminates external wiring exposed on the outside of the cell module and results in a more compact structure. Furthermore, copper busbars are placed on the outside of the positive and negative aluminum bars to improve the current-carrying capacity of the cell module. This device is not only compact and has simple wiring, but also occupies little space, requires minimal manual assembly, and effectively improves the efficiency of automated assembly. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of a cell module module for a battery pack according to the present invention;

[0020] Figure 2 This is an assembly drawing of a cell module for a battery pack according to the present invention;

[0021] Figure 3 This is an exploded view of the electrical connection components in the cell module module for a battery pack according to the present invention;

[0022] Figure 4 This is a schematic diagram showing the connection between a cell module and a liquid cooling plate for a battery pack, as described in this utility model.

[0023] Illustration markings:

[0024] 1-Battery cell module, 101-Battery cell;

[0025] 2-First electrical connection assembly;

[0026] 3-Second electrical connection assembly;

[0027] 4-Wire harness isolation plate, 401-Aluminum bar mounting position, 402-Flexible circuit board mounting position, 403-Guide post, 404-Explosion-proof hole, 405-External aluminum bar position, 406-Positive and negative aluminum bar position, 407-External aluminum bar slot, 408-Single pole through slot, 409-Positive and negative aluminum bar slot, 410-Positive and negative through slot, 411-Positive through slot, 412-Negative through slot;

[0028] 5-Aluminum bar, 501-External aluminum bar, 502-Positive and negative aluminum bar, 503-Positive connection part, 504-Negative connection part, 505-Guide hole;

[0029] 6- Flexible circuit board;

[0030] 7-Connector;

[0031] 8-Copper busbar, 801-Copper busbar guide hole;

[0032] 9 - First busbar;

[0033] 10 - Second busbar;

[0034] 11-PC film;

[0035] 12-Clamping end plate;

[0036] 13-Liquid cooling plate. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] like Figures 1-3 As shown, this solution provides a cell module for a battery pack, including a plurality of cells 101. Each cell 101 has a positive electrode on one side and a negative electrode on the other side. The cells 101 are arranged horizontally and intersecting each other to form a cell module 1. The cell module 1 includes a first cell module electrical connection edge and a second cell module electrical connection edge disposed on both sides. A first electrical connection component 2 is disposed on the first cell module electrical connection edge for connecting the positive and negative electrodes of two adjacent cells 101 located on the first cell module electrical connection edge; a second electrical connection component 3 is disposed on the second cell module electrical connection edge for connecting the positive and negative electrodes of two adjacent cells 101 located on the second cell module electrical connection edge.

[0039] The first electrical connection component 2 and the second electrical connection component 3 have the same specifications and both include a wire harness isolation plate 4. One side of the wire harness isolation plate 4 is used to fit the electrical connection edge of the first battery cell module or the electrical connection edge of the second battery cell module, and the other side is provided with parallel aluminum bar mounting positions 401 and flexible circuit board mounting positions 402. An aluminum bar 5 is provided on the aluminum bar mounting position 401, and a flexible circuit board 6 is provided on the flexible circuit board mounting position 402. The aluminum bar 5 is connected to the flexible circuit board 6 through a first busbar 9. A connector 7 is provided at one end of the flexible circuit board 6. The connector 7 is used to connect to an external battery management system to realize data acquisition and transmission.

[0040] The aluminum bar mounting position 401 includes external aluminum bar positions 405 disposed on both sides, and a plurality of positive and negative aluminum bar positions 406 disposed between the two external aluminum bar positions 405.

[0041] The aluminum bar 5 includes an external aluminum bar 501 corresponding to the external aluminum bar position 405, and a positive and negative aluminum bar 502 corresponding to the positive and negative aluminum bar positions 406.

[0042] The external aluminum bar position 405 is provided with an external aluminum bar insertion groove 407 for the external aluminum bar 501 to be embedded, and a single-pole through groove 408 is provided in the external aluminum bar insertion groove 407 for the electrode of a single cell 101 to be sleeved.

[0043] The positive and negative aluminum bar positions 406 are provided with positive and negative aluminum bar slots 409 for embedding the positive and negative aluminum bars 502, and positive and negative through slots 410 are provided in the positive and negative aluminum bar slots 409 for fitting the electrodes of the two cells 101.

[0044] In this embodiment, the external aluminum bar 501 is used to connect the battery cell module to the outside, facilitating external voltage output or external charging of the battery cell module; while the positive and negative aluminum bars 502 are used to connect the positive and negative terminals of two adjacent battery cells located on the electrical connection side of the first battery cell module or the electrical connection side of the second battery cell module in series. Through the above connection method, the various battery cells that make up the battery cell module are finally connected in series.

[0045] like Figure 3 As shown, the positive and negative electrode through grooves 410 include a positive electrode through groove 411 and a negative electrode through groove 412 disposed in the positive and negative electrode aluminum bar embedding groove 409. The positive electrode through groove 411 is used for the positive electrode of a single battery cell 101 to extend into, and the negative electrode through groove 412 is used for the negative electrode of a single battery cell 101 to extend into.

[0046] Specifically, the positive and negative electrode aluminum bar 502 includes a positive electrode connection part 503 that can act on the positive electrode through groove 411, and a negative electrode connection part 504 that can act on the negative electrode through groove 412; through this structure, the positive and negative electrodes of two connected cells 101 can be accurately electrically connected.

[0047] As an optimization of this embodiment, guide posts 403 are provided on the bottom walls of both the external aluminum bar insertion slot 407 and the positive and negative aluminum bar insertion slots 409, and guide holes 505 matching the guide posts 403 are provided on both the external aluminum bar 501 and the positive and negative aluminum bar 502; under the interaction of the guide posts 403 and the guide holes 505, the external aluminum bar 501 and the positive and negative aluminum bar 502 can be easily inserted into the external aluminum bar insertion slot 407 and the positive and negative aluminum bar insertion slots 409, respectively.

[0048] In this embodiment, a copper busbar 8 is also provided on the outside of the positive and negative aluminum bar 502. The copper busbar 8 is connected to the flexible circuit board 6 through a second busbar 10. This embodiment increases the overcurrent capacity of the cell module by adding the copper busbar 8, which helps to reduce battery temperature rise and improve energy density.

[0049] It should be noted that in this embodiment, both the first busbar 9 and the second busbar 10 are made of nickel sheets and are connected by welding.

[0050] In this embodiment, the copper busbar 8 matches the shape of the positive and negative aluminum bar 502 and can be embedded in the positive and negative aluminum bar groove 409 to achieve embedded concealment.

[0051] To facilitate precise installation of the copper busbar, a copper busbar guide hole 801 matching the guide post 403 is also provided on the copper busbar.

[0052] As an optimization of this solution, adjacent battery cells are isolated by a pair of PC sheets 11. The PC sheets have the characteristics of impact resistance, high temperature resistance and sound insulation, which can ensure that adjacent battery cells can work without affecting each other.

[0053] like Figure 3 As shown, as a further optimization of this solution, the flexible circuit board mounting position 402 is provided with a plurality of explosion-proof holes 404. The explosion-proof holes 404 are used to prevent the internal pressure of the battery cell from being too high, which could lead to an explosion, while ensuring that the gas can be discharged in time to protect the battery safety.

[0054] like Figure 1 As shown, in one embodiment of this solution, clamping end plates 12 are respectively provided at both ends of the cell module 1, which are used to squeeze and press the horizontal cells after they are installed in the battery pack housing.

[0055] like Figure 4As shown, as another embodiment of this solution, a liquid cooling plate 13 can also be provided at the bottom of the battery cell module 1 to cool down the battery cell module during operation and provide a stable environment for the operation of the battery cell module.

[0056] The above description is only for illustrating the embodiments of this utility model and is not intended to limit this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cell module for a battery pack, characterized in that, The battery module (1) includes several battery cells (101), one side of which is provided with a positive electrode and the other side with a negative electrode. The battery cells (101) are arranged horizontally and intersecting each other to form a battery cell module (1). The battery cell module (1) includes a first battery cell module electrical connection edge and a second battery cell module electrical connection edge disposed on both sides. A first electrical connection component (2) is disposed on the first battery cell module electrical connection edge, and a second electrical connection component (3) is disposed on the second battery cell module electrical connection edge. The first electrical connection component (2) and the second electrical connection component (3) have the same specifications and both include a wire harness isolation plate (4). One side of the wire harness isolation plate (4) is used to fit the electrical connection edge of the first battery cell module or the electrical connection edge of the second battery cell module. The other side is provided with parallel aluminum bar mounting positions (401) and flexible circuit board mounting positions (402). An aluminum bar (5) is provided on the aluminum bar mounting position (401), and a flexible circuit board (6) is provided on the flexible circuit board mounting position (402). The aluminum bar (5) is connected to the flexible circuit board (6) through a first busbar (9). A connector (7) is provided at one end of the flexible circuit board (6). The aluminum bar mounting position (401) includes external aluminum bar positions (405) disposed on both sides, and a plurality of positive and negative aluminum bar positions (406) disposed between the two external aluminum bar positions (405); The aluminum bar (5) includes an external aluminum bar (501) corresponding to the external aluminum bar position (405) and a positive and negative aluminum bar (502) corresponding to the positive and negative aluminum bar positions (406); The external aluminum bar position (405) is provided with an external aluminum bar insertion groove (407) for the external aluminum bar (501) to be inserted, and a single-pole through groove (408) for the electrode of a single cell (101) to be sleeved in the external aluminum bar insertion groove (407). The positive and negative aluminum bar positions (406) are provided with positive and negative aluminum bar insertion slots (409) for embedding the positive and negative aluminum bars (502), and positive and negative through slots (410) are provided in the positive and negative aluminum bar insertion slots (409) for fitting the electrodes of the two cells (101).

2. A cell module for a battery pack according to claim 1, characterized in that, The positive and negative electrode through slots (410) include a positive electrode through slot (411) and a negative electrode through slot (412) disposed in the positive and negative electrode aluminum bar embedding slots (409). The positive electrode through slot (411) is used for the positive electrode of a single cell (101) to extend into, and the negative electrode through slot (412) is used for the negative electrode of a single cell (101) to extend into.

3. A cell module for a battery pack according to claim 2, characterized in that, The positive and negative aluminum bars (502) include a positive electrode connection portion (503) that can act on the positive electrode through groove (411) and a negative electrode connection portion (504) that can act on the negative electrode through groove (412).

4. A cell module for a battery pack according to claim 1, characterized in that, Guide posts (403) are provided on the bottom walls of the external aluminum bar slot (407) and the positive and negative aluminum bar slot (409), and guide holes (505) matching the guide posts (403) are provided on the external aluminum bar (501) and the positive and negative aluminum bar (502).

5. A cell module for a battery pack according to claim 1, characterized in that, A copper busbar (8) is also provided on the outside of the positive and negative aluminum bar (502), and the copper busbar (8) is connected to the flexible circuit board (6) through the second busbar (10).

6. A cell module for a battery pack according to claim 5, characterized in that, The copper busbar (8) matches the shape of the positive and negative aluminum bars (502) and can be embedded in the positive and negative aluminum bar groove (409).

7. A cell module for a battery pack according to claim 1, characterized in that, Adjacent cells are isolated by a pair of PC sheets (11).

8. A cell module for a battery pack according to claim 1, characterized in that, The flexible circuit board mounting position (402) is provided with a number of explosion-proof holes (404).

9. A cell module for a battery pack according to claim 1, characterized in that, Clamping end plates (12) are respectively provided at both ends of the battery cell module (1).

10. A cell module for a battery pack according to claim 1, characterized in that, The bottom of the battery cell module (1) is also provided with a liquid cooling plate (13).

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