Electrical connection device between battery cells for battery cell module

Abstract

The utility model relates to the technical field of battery packs, in particular to an electric connection device between battery cells of a battery cell module, which comprises a wire harness isolation plate, one side of the wire harness isolation plate is used for being attached to an electrode surface of the battery cell module, and the other side of the wire harness isolation plate is provided with an aluminum bar mounting position and a flexible circuit board mounting position which are parallel to each other. An aluminum bar is arranged on the aluminum bar mounting position, a flexible circuit board is arranged on the flexible circuit board mounting position, and the aluminum bar is connected with the flexible circuit board through a first busbar; a copper bar is arranged on the outer side of the aluminum bar, and the copper bar is connected with the flexible circuit board through a second busbar; and a connector is arranged at one end of the flexible circuit board. The device not only is simple in structure and easy to process, but also can ensure that the flat cable in the battery pack is simpler, the dependence on manual assembly is small, and the efficiency of automatic assembly can be effectively improved.

Description

Technical Field

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

[0002] 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 blade battery cells, the positive and negative terminals are arranged on both sides. Voltage is typically acquired using wiring harnesses. However, traditional harness acquisition requires multiple harnesses, which not only occupies a large space in the battery pack but also relies heavily on manual labor during electrical connections, resulting in very low automation. Furthermore, if the current exceeds the battery's rated value or design range during charging or discharging, it may damage the battery or even cause a safety accident. Therefore, overcurrent protection is necessary to ensure stable power supply to the battery.

[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 an electrical connection device between battery cells in a battery cell module. This device solves the technical problems of traditional wire harness acquisition of battery cells requiring multiple wire harnesses, which not only occupies a large space in the battery pack, but also relies heavily on manual labor during electrical connection, and the battery is prone to overcurrent during charging or discharging.

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

[0008] An electrical connection device between battery cells for a battery cell module includes a wire harness isolation plate. One side of the wire harness isolation plate is used to fit the electrode surface of the battery cell module, and the other side is provided with parallel aluminum bar mounting positions and flexible circuit board mounting positions. An aluminum bar is provided on the aluminum bar mounting position, and a flexible circuit board is provided on the flexible circuit board mounting position. The aluminum bar is connected to the flexible circuit board through a first busbar. A copper busbar is provided on the outer side of the aluminum bar, and the copper busbar is connected to the flexible circuit board through a second busbar. A connector is provided at one end of the flexible circuit board.

[0009] Furthermore, the aluminum bar mounting position is provided with an aluminum bar groove, which includes end aluminum bar grooves located at both ends of the aluminum bar mounting position and a plurality of individual aluminum bar grooves located between the two end aluminum bar grooves. The bottom walls of the individual aluminum bar grooves and the end aluminum bar grooves are provided with electrode through grooves that can be used to fit the electrodes of the battery cell.

[0010] Furthermore, the aluminum bar includes an aluminum bar unit corresponding to the aluminum bar unit slot and an end aluminum bar corresponding to the end aluminum bar slot, and the end aluminum bar is also provided with a reversing connection part.

[0011] Furthermore, the reversing connection includes an aluminum bar reversing part that is perpendicularly connected to the end aluminum bar, and a right-angle electrical connection part that is connected to the aluminum bar reversing part, wherein the right-angle electrical connection part is provided with a bolt connection hole.

[0012] Furthermore, the copper busbar can be embedded in the aluminum bar groove, and a pair of copper busbar guide holes are provided on the copper busbar; the bottom wall of the aluminum bar single-unit groove is also provided with guide posts corresponding to the copper busbar guide holes.

[0013] Furthermore, the flexible circuit board mounting position is provided with several explosion-proof holes.

[0014] Furthermore, the first busbar is electrically connected to the inner side of the flexible circuit board, and the second busbar is electrically connected to the outer side of the flexible circuit board.

[0015] Furthermore, both the first bus and the second bus are nickel plates.

[0016] This invention provides an electrical connection device between battery cells in a battery cell module. The battery cell is attached to one side of a wire harness isolation plate, while the aluminum busbar and a flexible circuit board with connectors are mounted on the other side. This enables rapid electrical connection between the aluminum busbar / flexible circuit and the battery cell. A copper busbar is placed on the outside of the aluminum busbar to improve the current-carrying capacity of the battery cell module. This device is not only simple in structure and easy to manufacture, but also ensures cleaner wiring within the battery pack, reduces reliance on manual assembly, and effectively improves the efficiency of automated assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the connection between the inter-cell electrical connection device for a cell module and the cell module described in this utility model.

[0018] Figure 2 This is a first-view structural schematic diagram of the inter-cell electrical connection device for a cell module according to the present invention;

[0019] Figure 3 This is a second-view structural schematic diagram of the inter-cell electrical connection device for a cell module according to the present invention;

[0020] Figure 4 This is an exploded view of an electrical connection device between battery cells in a battery cell module according to the present invention.

[0021] Illustration markings:

[0022] 1-Wire harness isolation plate, 101-Aluminum bar mounting position, 102-Flexible circuit board mounting position, 103-Aluminum bar recess, 104-Aluminum bar recess, 105-Aluminum bar individual recess, 106-Electrode through groove, 107-Guide post, 108-Explosion-proof hole;

[0023] 2-Aluminum bar, 201-Aluminum bar unit, 202-End aluminum bar, 203-Reversing connection, 204-Aluminum bar reversing part, 205-Right angle electrical connection, 206-Bolt connection hole;

[0024] 3-Flexible circuit board;

[0025] 4-Electrode connection hole;

[0026] 5-Connector;

[0027] 6-First busbar;

[0028] 7-Second busbar;

[0029] 8-Battery cell module;

[0030] 9-Copper busbar, 901-Copper busbar guide hole. Detailed Implementation

[0031] 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.

[0032] like Figures 1-4As shown, this solution provides an electrical connection device between battery cells for a battery cell module, including a wire harness isolation plate 1. One side of the wire harness isolation plate 1 is used to fit the electrode surface of the battery cell module 8, and the other side is provided with parallel aluminum bar mounting positions 101 and flexible circuit board mounting positions 102. An aluminum bar 2 is provided on the aluminum bar mounting position 101, and a flexible circuit board 3 is provided on the flexible circuit board mounting position 102. The aluminum bar 2 is connected to the flexible circuit board 3 through a first busbar 6.

[0033] A copper busbar 9 is provided on the outside of the aluminum busbar 2, and the copper busbar 9 is connected to the flexible circuit board 3 through the second busbar 7;

[0034] One end of the flexible circuit board 3 is provided with a connector 5, which is used to connect to an external battery management system to realize data acquisition and transmission.

[0035] This utility model is mainly used for a cell module composed of blade battery cells with electrodes set on the side. One side of the wire harness isolation plate 1 is attached to the electrode surface of the cell module 8, and the other side is electrically connected to the electrode on the cell by installing an aluminum bar 2 on the aluminum bar mounting position 101. The cells are connected in series through the connection of the first busbar 6 and the flexible circuit board 3, which facilitates the output of current.

[0036] Furthermore, by setting a copper busbar 9 on the outside of the aluminum bar 2, and connecting the copper busbar 9 to the flexible circuit board 3 via the second busbar 7, this structure can improve the overcurrent capacity, help reduce the battery temperature rise, and increase the energy density.

[0037] Both the first busbar 6 and the second busbar 7 are nickel sheets, which are connected by welding.

[0038] In this embodiment, the aluminum bar mounting position 101 is provided with an aluminum bar groove 103. The aluminum bar groove 103 includes end aluminum bar grooves 104 disposed at both ends of the aluminum bar mounting position 101, and a plurality of aluminum bar individual grooves 105 disposed between the two end aluminum bar grooves 104. The bottom wall of the aluminum bar individual groove 105 and the end aluminum bar groove 104 are provided with electrode through grooves 106 for fitting the electrodes of the battery cell. The electrode through grooves 106 can accurately position the protruding electrodes on the battery cell and ensure that they extend into the electrode through grooves 106, thereby facilitating the contact electrical connection between the aluminum bar individual 201 and the aluminum bar individual groove 105 after installation.

[0039] As an optimization of this solution, several electrode connection holes 4 are also opened on the aluminum busbar 2 and the copper busbar 9 respectively, so as to achieve a locking connection between the copper busbar 9, the aluminum busbar 2 and the electrode by screws.

[0040] The aluminum bar 2 includes an aluminum bar unit 201 corresponding to the aluminum bar unit slot 105, and an end aluminum bar 202 corresponding to the end aluminum bar slot 104. The end aluminum bar 202 is also provided with a reversing connection part 203 for electrical connection with external components.

[0041] like Figure 2 As shown, the reversing connection part 203 in this embodiment includes an aluminum bar reversing part 204 that is perpendicularly connected to the end aluminum bar 202, and a right-angle electrical connection part 205 that is connected to the aluminum bar reversing part 204. The right-angle electrical connection part 205 is provided with a bolt connection hole 206 for easy screwing connection with external conductive parts such as copper bars, such as realizing series connection with adjacent battery cell modules 8.

[0042] like Figure 4 As shown, the copper busbar 9 can be embedded in the aluminum bar single-unit groove 105, and a pair of copper busbar guide holes 901 are provided on the copper busbar 9; the bottom wall of the aluminum bar single-unit groove 105 is also provided with guide posts 107 corresponding to the copper busbar guide holes 901; by fitting the copper busbar guide holes 901 onto the guide posts 107, the copper busbar 9 can be accurately installed in the position of the aluminum bar groove.

[0043] As an optimization of this embodiment, the flexible circuit board mounting position 102 is provided with a plurality of explosion-proof holes 108. The explosion-proof holes 108 are used to prevent the internal pressure of the battery cell from being too high and causing an explosion, while ensuring that the gas can be discharged in time to protect the battery safety.

[0044] As a further optimization of this embodiment, the first busbar 6 is electrically connected to the inner side of the flexible circuit board 3, and the second busbar 7 is electrically connected to the outer side of the flexible circuit board 3.

[0045] Since the aluminum busbars 2 are all located inside the copper busbars 9, the first busbar 6 is placed on the inner side of the flexible circuit board 3, while the second busbar 7 is placed on the outer side of the flexible circuit board 3, which makes wiring more convenient and ensures that the flexible circuit board 3 fits the flexible circuit board mounting position 102.

[0046] In this embodiment, the connection between the flexible circuit board 3 and the flexible circuit board mounting position 102 is not limited to double-sided tape, glue, or screw connection.

[0047] 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-to-cell electrical connection device for a cell module, characterized in that, The device includes a wire harness isolation plate (1), one side of which is used to attach the electrode surface of the battery cell module (8), and the other side is provided with parallel aluminum bar mounting positions (101) and flexible circuit board mounting positions (102). An aluminum bar (2) is provided on the aluminum bar mounting position (101), and a flexible circuit board (3) is provided on the flexible circuit board mounting position (102). The aluminum bar (2) is connected to the flexible circuit board (3) through a first busbar (6). A copper busbar (9) is provided on the outside of the aluminum busbar (2), and the copper busbar (9) is connected to the flexible circuit board (3) through a second busbar (7); A connector (5) is provided at one end of the flexible circuit board (3).

2. The inter-cell electrical connection device for a cell module according to claim 1, characterized in that, The aluminum bar mounting position (101) is provided with an aluminum bar groove (103). The aluminum bar groove (103) includes end aluminum bar grooves (104) disposed at both ends of the aluminum bar mounting position (101) and a plurality of aluminum bar individual grooves (105) disposed between the two end aluminum bar grooves (104). The bottom wall of the aluminum bar individual groove (105) and the end aluminum bar groove (104) are provided with electrode through grooves (106) for fitting the electrodes of the battery cell.

3. The inter-cell electrical connection device for a cell module according to claim 2, characterized in that, The aluminum bar (2) includes an aluminum bar unit (201) corresponding to the aluminum bar unit slot (105) and an end aluminum bar (202) corresponding to the end aluminum bar slot (104). The end aluminum bar (202) is also provided with a reversing connection part (203).

4. The inter-cell electrical connection device for a cell module according to claim 3, characterized in that, The reversing connection part (203) includes an aluminum bar reversing part (204) that is perpendicularly connected to the end aluminum bar (202), and a right-angle electrical connection part (205) connected to the aluminum bar reversing part (204), wherein the right-angle electrical connection part (205) is provided with a bolt connection hole (206).

5. The inter-cell electrical connection device for a cell module according to claim 2, characterized in that, The copper busbar (9) can be embedded in the aluminum bar single-unit groove (105), and a pair of copper busbar guide holes (901) are provided on the copper busbar (9); the bottom wall of the aluminum bar single-unit groove (105) is also provided with guide posts (107) corresponding to the copper busbar guide holes (901).

6. The inter-cell electrical connection device for a cell module according to claim 1, characterized in that, The flexible circuit board mounting position (102) is provided with a number of explosion-proof holes (108).

7. The inter-cell electrical connection device for a cell module according to claim 1, characterized in that, The first bus (6) is electrically connected to the inner side of the flexible circuit board (3), and the second bus (7) is electrically connected to the outer side of the flexible circuit board (3).

8. A cell-to-cell electrical connection device for a cell module according to claim 1 or 7, characterized in that, Both the first busbar (6) and the second busbar (7) are nickel sheets.

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