Detachable cell connection sheet with thermal activation separation function

Abstract

The utility model discloses detachable electric core connecting piece with heat activation separation function, including connecting piece body, be equipped with the heat activation separation layer for connecting electric core on connecting piece body, be equipped with electric resistance wire in connecting piece body, and connecting piece side is equipped with the joint of connecting electric resistance wire, and connecting piece surface is equipped with the recess of connecting piece fixed when welding, the utility model discloses can improve the contact intensity of electric core and connecting piece, and after testing, can conveniently detach connecting piece, do not damage the life of electric core, and electric core can also be used for the package, improved the comprehensive value of electric core.

Description

Technical Field

[0001] This utility model belongs to the field of battery cell assembly technology, specifically relating to a detachable battery cell connector with thermal activation separation function. Background Technology

[0002] Currently, battery cell tabs and connecting pieces are mostly fixed by ultrasonic welding or laser welding. Although this method can achieve a stable electrical connection, the connecting pieces need to be physically cut when disassembling after testing. This can easily damage the aluminum-plastic film or electrode structure of the battery cell, leading to the scrapping of the battery cell and significantly increasing testing costs.

[0003] To address the disassembly challenge, snap-fit ​​connectors have emerged in the industry, achieving detachable connections through mechanical structures. However, the contact resistance of these connectors fluctuates by more than 15%, failing to meet the requirements for low resistance and high stability in high-current testing scenarios for power batteries, and easily leading to distorted test data.

[0004] In addition, the existing detachable connection structure has the problem of insufficient stability after repeated installation. After three disassembly and assembly, the contact pressure decreases by more than 40%, which leads to a sharp decline in connection reliability and affects the test cycle life of the connection piece. Utility Model Content

[0005] The purpose of this invention is to provide a detachable battery cell connector with thermal activation separation function, which can improve the contact strength between the battery cell and the connector. After the test, the connector can be easily disassembled without damaging the battery cell's lifespan. The battery cell can also be used for packaging, thus improving the overall value of the battery cell.

[0006] To achieve the above objectives, the present invention provides a detachable battery cell connector with thermal activation separation function, comprising a connector body, wherein the connector body is provided with a thermal activation separation layer for connecting battery cells.

[0007] The connecting piece body has a resistance wire inside, and the connecting piece side has a connector for connecting the resistance wire;

[0008] The surface of the connecting piece is provided with grooves for fixing the connecting piece during welding.

[0009] As a further embodiment of this utility model: the connecting piece body has a double-wing mirror symmetric structure, and the surface is coated with a gradient Ni-Cu composite layer.

[0010] As a further embodiment of this utility model: the connecting piece body includes a heating wing and a testing wing, the heating wing and the testing wing are side-connected and mirror-symmetrical.

[0011] As a further embodiment of this utility model: the resistance wire is disposed inside the heating wing, the groove is disposed on the outer surface of the heating wing, and the test wing is provided with a through hole and a chip is embedded therein.

[0012] As a further embodiment of this invention: the thermally activated separation layer is a Sn-Bi eutectic alloy transition layer with a thickness of 20-50 μm.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] A Sn-Bi eutectic alloy transition layer is used to achieve controllable separation of the thermal response at the welding interface, which facilitates the disassembly and separation of the battery cell and the connecting piece.

[0015] Based on the double-wing mirror symmetry structure design combined with gradient Ni-Cu composite layer coating treatment, the number of uses can be effectively increased.

[0016] The grooves enable precise positioning and welding of the cell tabs and connecting pieces. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the detachable battery cell connector with thermal activation separation function of this utility model.

[0018] Figure 2 This is a schematic diagram of the internal connection of the resistance wire in the detachable battery cell connector with thermal activation separation function of this utility model.

[0019] In the diagram: 1. Heating wing, 2. Test wing, 3. Chip, 4. Through hole, 5. Groove, 6. Connector, 7. Thermal activation separation layer, 8. Resistance wire. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 and Figure 2 As shown, the detachable cell connector with thermal activation separation function includes a connector body, and the connector body is provided with a thermal activation separation layer 7 for connecting the cell.

[0022] The connecting piece body has a resistance wire 8 inside, and a connector 6 for connecting the resistance wire 8 is provided on the side of the connecting piece; the connector 6 is used to energize the resistance wire 8 to achieve the heating effect on the connecting piece body, so that the thermally activated separation layer 7 reaches a suitable temperature and promotes the separation of the connecting piece from the battery cell.

[0023] The surface of the connecting piece is provided with a groove 5 for fixing the connecting piece during welding. The groove 5 can be designed to match the cell model, which facilitates positioning and fixing of the connecting piece and the cell during connection.

[0024] To ensure the strength of the connecting piece, the connecting piece body further features a double-wing mirror-symmetric structure with a gradient Ni-Cu composite layer plated on the surface. Preferably, the connecting piece body is made of spring steel sheet with a yield strength ≥1200MPa. The spring steel sheet maintains constant contact pressure through elastic deformation during assembly and disassembly. The gradient Ni-Cu composite layer, with Ni 3μm / Cu 5μm, inhibits oxidation and reduces contact resistance fluctuations, resulting in contact resistance fluctuations ≤3% after 50 assembly and disassembly cycles. Compared to traditional snap-fit ​​solutions (contact pressure attenuation >40% after 3 assembly and disassembly cycles), this structure significantly improves dynamic stability and fatigue resistance.

[0025] Furthermore, the connecting piece body includes a heating wing 1 and a test wing 2, which are side-connected and mirror-symmetrical.

[0026] To better control the heating effect of the resistance wire 8, the resistance wire 8 is further disposed inside the heating wing 1, the groove 5 is disposed on the outer surface of the heating wing 1, and the test wing 2 is provided with a through hole 4, into which a chip 3 is embedded. The through hole 4 is used to connect the test circuit during cell testing; the chip 3 can be used to collect the temperature changes of the cell and connecting piece, thereby enabling safer energization and heating in conjunction with the resistance wire 8, and separating the connecting piece and cell through the thermally activated separation layer 7.

[0027] Furthermore, the thermally activated separation layer 7 is a Sn-Bi eutectic alloy transition layer with a thickness of 20-50 μm. The Sn-Bi eutectic alloy transition layer is softened by locally heating it to 150-180℃ using a resistance wire 8, thereby ensuring a high integrity rate of the cell terminals after disassembly.

[0028] In a specific implementation of this utility model, the connecting piece and the battery cell are matched and connected through the thermal activation separation layer 7 and the groove 5. After the test is completed, the resistance wire 8 is heated by the connector 6. The temperature change of the battery cell and the connecting piece is collected by the chip 3. When the temperature of the connecting piece reaches the temperature required by the thermal activation separation layer 7, the thermal activation separation layer 7 is softened and the heating is stopped, so that the connecting piece and the battery cell can be separated without damage.

Claims

1. A detachable cell connector with thermal activation separation function, comprising a connector body, characterized in that, The connecting piece body is provided with a thermally activated separation layer (7) for connecting the battery cell; The connecting piece body has a resistance wire (8) inside, and a connector (6) for connecting the resistance wire (8) is provided on the side of the connecting piece; The surface of the connecting piece is provided with a groove (5) for fixing the connecting piece during welding.

2. The detachable cell connector with thermal activation separation function according to claim 1, characterized in that, The connecting piece body has a double-wing mirror symmetry structure and is coated with a gradient Ni-Cu composite layer on its surface.

3. The detachable cell connector with thermal activation separation function according to claim 2, characterized in that, The connecting piece body includes a heating wing (1) and a test wing (2), which are side-connected and mirror-symmetrical.

4. The detachable cell connector with thermal activation separation function according to claim 3, characterized in that, The resistance wire (8) is located inside the heating wing (1), the groove (5) is located on the outer surface of the heating wing (1), and the test wing (2) has a through hole (4) and a chip (3) is embedded therein.

5. The detachable cell connector with thermal activation separation function according to any one of claims 1-4, characterized in that, The thermally activated separation layer (7) is a Sn-Bi eutectic alloy transition layer with a thickness of 20-50 μm.

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