Tab connecting structure and battery module

Abstract

The utility model provides a kind of tab connecting structure and battery module, belong to electrode coupling field.The tab connecting structure includes upper layer conductor and lower layer conductor, and upper layer conductor is at least one tab, and lower layer conductor is tab and / or conducting row, and the tab connecting structure further includes collection terminal, and collection terminal is clamped between upper layer conductor and lower layer conductor and is welded with upper layer conductor and lower layer conductor together.The battery module includes the tab connecting structure described above.The utility model connects collection terminal and tab together by once welding, reduces processing procedure, improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of electrode connection, and in particular relates to an electrode tab connection structure and a battery module. Background Technology

[0002] In a battery module, the tabs of different cells are connected by welding. The specific process is to first place the busbar between the two cells that need to be connected, then bend the tabs of the two cells that need to be connected toward the busbar and stack them on the busbar. Finally, the battery module is transferred to the welding station to complete the welding, so that the tabs and the busbar are connected.

[0003] After the electrode tabs are soldered, acquisition terminals need to be soldered onto the electrode tabs. The acquisition terminals are connected to signal acquisition harnesses, which are used to acquire information such as the current and voltage of the battery cell.

[0004] Currently, the tabs and data acquisition terminals are welded separately, resulting in cumbersome processes and low battery production efficiency. Furthermore, before welding the data acquisition terminals, they need to be positioned and clamped in place using tooling; this operation must be performed at the welding station, further impacting welding efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a tab connection structure to solve the technical problems of low battery production efficiency caused by the separate welding of the acquisition terminal and the tab in the prior art, as well as the technical problems of low welding efficiency caused by the acquisition terminal needing to be positioned and fixed at the welding station.

[0006] Another objective of this invention is to provide a battery module to solve the aforementioned technical problems.

[0007] To achieve the above objectives, the technical solution of the electrode connection structure provided by this utility model is as follows:

[0008] A tab connection structure includes an upper conductor and a lower conductor. The upper conductor is at least one layer of tabs, and the lower conductor is a tab and / or a conductive bar. The tab connection structure also includes a data acquisition terminal, which is clamped between the upper conductor and the lower conductor and soldered together with the upper conductor and the lower conductor.

[0009] As a further improvement, the lower conductor is a conductive bus, and the upper conductor is at least one tab. The conductive bus is provided with a receiving groove for accommodating the welding plate for accommodating the acquisition terminal. The depth of the receiving groove is equal to the thickness of the welding plate so that the top surface of the welding plate is flush with the top surface of the conductive bus.

[0010] As a further improvement, the upper conductor includes only one tab, and the lower conductor is a lead-out busbar for leading out electrodes to form the entire battery module.

[0011] As a further improvement, the upper conductor is a tab on a battery cell, the lower conductor is a busbar and a tab on another battery cell pressed on top of the busbar, and the acquisition terminal is clamped between the tabs of the upper conductor and the tabs of the lower conductor.

[0012] As a further improvement, the upper conductor is a tab on one battery cell, the lower conductor is a tab on another battery cell, and the acquisition terminal is clamped between the tabs of the upper conductor and the lower conductor.

[0013] The beneficial effects are as follows: The tab connection structure provided by this utility model is an improvement on the existing technology. This tab connection structure presses the acquisition terminal under the tab and fixes it together with the tab in a single welding process, reducing processing steps and improving production efficiency. Furthermore, pressing the acquisition terminal under the tab can be done outside the welding station; after the battery module is transferred to the welding station, it can be directly clamped using tooling before welding, reducing welding operation steps and improving production efficiency.

[0014] To achieve the above objectives, the technical solution for the battery module provided by this utility model is as follows:

[0015] A battery module includes a battery cell, which is connected to another battery cell via a tab connection structure or has electrodes led out from the battery cell via the tab connection structure. The tab connection structure includes an upper conductor and a lower conductor, the upper conductor being at least one layer of tabs, and the lower conductor being a tab and / or a conductive bus. The tab connection structure also includes a data acquisition terminal, which is sandwiched between the upper conductor and the lower conductor and soldered together with the upper conductor and the lower conductor.

[0016] As a further improvement, the lower conductor is a conductive bus, and the upper conductor is at least one tab. The conductive bus is provided with a receiving groove for accommodating the welding plate for accommodating the acquisition terminal. The depth of the receiving groove is equal to the thickness of the welding plate so that the top surface of the welding plate is flush with the top surface of the conductive bus.

[0017] As a further improvement, the upper conductor includes only one tab, and the lower conductor is a lead-out busbar for leading out electrodes to form the entire battery module.

[0018] As a further improvement, the upper conductor is a tab on a battery cell, the lower conductor is a busbar and a tab on another battery cell pressed on top of the busbar, and the acquisition terminal is clamped between the tabs of the upper conductor and the tabs of the lower conductor.

[0019] As a further improvement, the upper conductor is a tab on one battery cell, the lower conductor is a tab on another battery cell, and the acquisition terminal is clamped between the tabs of the upper conductor and the lower conductor.

[0020] The beneficial effects are as follows: The battery module provided by this utility model is an improvement on the existing technology. In this battery module, the electrode connection structure presses the acquisition terminal under the electrode and fixes it together with the electrode through a one-time welding, reducing processing steps and improving production efficiency. Furthermore, pressing the acquisition terminal under the electrode does not need to be done at the welding station. After the battery module is transferred to the welding station, it can be directly clamped by tooling before welding, reducing welding operation steps and improving production efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of one embodiment of the electrode connection structure in this utility model;

[0022] Figure 2 This is an exploded view of one embodiment of the electrode connection structure of this utility model (Embodiment 1).

[0023] Figure 3 This is a schematic diagram of the acquisition terminal in Embodiment 1 of the electrode connection structure of this utility model;

[0024] Figure 4 This is a schematic diagram of another embodiment of the electrode connection structure in this utility model;

[0025] Figure 5 This is a schematic diagram of one embodiment of the electrode connection structure in Embodiment 2 of this utility model;

[0026] Figure 6 This is a schematic diagram of one embodiment of the electrode connection structure in this utility model, which is described in embodiment 3.

[0027] Figure 7 This is an exploded view of one embodiment of the electrode connection structure of the present invention, embodiment 3.

[0028] Figure 8 This is a schematic diagram of another embodiment of the electrode connection structure in this utility model, which is described in Embodiment 3.

[0029] Figure 9 This is a schematic diagram of one embodiment of the electrode connection structure in embodiment 4 of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Acquisition terminal; 11. Welding plate; 12. Crimping part; 2. Electrode tab; 3. Conductive busbar between cells; 4. Lead-out conductive busbar; 5. Receiving groove. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the embodiments.

[0033] Specific embodiment 1 of the electrode connection structure provided by this utility model:

[0034] The electrode connection structure includes an upper conductor, a lower conductor, and a data acquisition terminal 1 sandwiched between the upper and lower conductors. (See appendix) Figure 1 and attached Figure 2 In this embodiment, the upper conductor is a double-layer tab 2, and the lower conductor is a conductive busbar.

[0035] Specifically, the lower conductor is the inter-cell conductive busbar 3 between two adjacent cells, and the two tabs 2 in the upper conductor are from two adjacent cells and are tabs 2 with different poles of the two cells. The two tabs 2 are bent from both sides of the inter-cell conductive busbar 3 and cover the inter-cell conductive busbar 3.

[0036] See appendix Figure 3 The acquisition terminal 1 includes a welding plate 11 and a crimping part 12. The crimping part 12 is used to crimp and conduct with the signal acquisition harness, and the welding plate 11 is used to connect and conduct with the electrode 2.

[0037] The forming process of the electrode connection structure is as follows: First, the inter-cell conductive busbar 3 is placed on the insulating support between two cells. Then, the electrodes 2 that need to be connected on the two cells are bent toward the conductive busbar in sequence and pressed on the inter-cell conductive busbar 3. Then, the welding plate 11 of the acquisition terminal 1 connected with the signal acquisition wire harness is inserted between the lower electrode 2 and the inter-cell conductive busbar 3. At this time, the signal acquisition terminal 1 is pressed tightly on the inter-cell conductive busbar 3 by the two electrodes 2. Finally, the battery module is transferred to the welding station, the electrode 2 is pressed with the tooling, and the two electrodes 2, one acquisition terminal 1 and one inter-cell conductive busbar 3 are welded together by laser welding.

[0038] Compared to existing technologies, firstly, the acquisition terminal 1 and the electrode tab 2 in this electrode connection structure are welded together in one step, reducing processing steps and thus improving the overall production efficiency of the battery module. Secondly, since the acquisition terminal 1 is sandwiched between the upper and lower conductors, its positioning and fixing can be completed at the preparation station before welding. Furthermore, during the transfer of the battery module from the preparation station to the welding station, the acquisition terminal 1 remains stable under the pressure of the upper conductor. Therefore, positioning of the acquisition terminal 1 is no longer required before welding at the welding station, effectively reducing welding steps, improving welding efficiency, and consequently increasing the overall production efficiency of the battery module.

[0039] In this embodiment, the welding plate 11 of the acquisition terminal 1 is a nickel sheet, and the two tabs 2 and the conductive bus can be either copper or aluminum. Since nickel has a high melting point, the thickness of the acquisition terminal 1 needs to be small in order to place the acquisition terminal 1 under the two layers of tabs 2 for welding and to ensure full penetration.

[0040] In other embodiments of this implementation, see Appendix Figure 4 The upper conductor is a double-layer tab 2 on the same side, and the two tabs 2 are the same-pole tabs 2 on the two cells. The lower conductor is a lead-out conductive bus 4, which is a conductive bus at one end of the battery module used to lead out and serve as the electrode of the battery module.

[0041] Specific Embodiment 2 of the electrode connection structure provided by this utility model:

[0042] The electrode connection structure includes an upper conductor, a lower conductor, and a data acquisition terminal 1 sandwiched between the upper and lower conductors. (See appendix) Figure 5 In this embodiment, the upper conductor is a single-layer tab 2, and the lower conductor is a conductive busbar.

[0043] Specifically, the lower conductor's conductive busbar is the lead-out conductive busbar 4 at one end of the battery module, which serves as the electrode of the battery module. The upper conductor's tab 2 is bent from one side of the lead-out conductive busbar 4 and covers the lead-out conductive busbar 4.

[0044] The acquisition terminal 1 includes a welding plate 11 and a crimping part 12. The crimping part 12 is used to crimp and conduct with the signal acquisition harness, and the welding plate 11 is used to connect and conduct with the tab 2. The welding plate 11 of the acquisition terminal 1 is sandwiched between the upper conductor and the lower conductor, and the top surface of the lead-out conductive busbar 4 of the lower conductor is provided with a receiving groove 5 for accommodating the welding plate 11. The depth of the receiving groove 5 is equal to the thickness of the welding plate 11, so that after the welding plate 11 is placed in the receiving groove 5, the top surface of the welding plate 11 is flush with the top surface of the lead-out conductive busbar 4.

[0045] In this embodiment, since the welding plate 11 does not protrude from the lead-out conductive bus 4, the lower surface of the tab 2 can be completely fitted with the upper surface of the lead-out conductive bus 4 along the entire length of the weld, effectively ensuring the current-carrying capacity between the tab 2 and the lead-out conductive bus 4. Otherwise, if the welding plate 11 protrudes from the lead-out conductive bus 4, a gap will appear between the tab 2 and the lead-out conductive bus 4 in the area around the welding plate 11, which is not conducive to the transmission of larger currents.

[0046] In other embodiments of this implementation, the upper conductor can be a double-layer tab 2, and the lower conductor remains a lead-out conductive bus 4. In this embodiment, the two tabs 2 in the upper conductor are tabs 2 of the same polarity on two battery cells, and the two tabs 2 are located on the same side of the lead-out conductive bus 4.

[0047] In other embodiments of this implementation, the upper conductor can be a double-layer tab 2, and the lower conductor is an inter-cell conductive busbar 3. The inter-cell conductive busbar 3 is provided with a receiving groove 5 for accommodating the welding plate 11 of the acquisition terminal 1, which can also ensure good overcurrent capacity.

[0048] Specific embodiment 3 of the electrode connection structure provided by this utility model:

[0049] The electrode connection structure includes an upper conductor, a lower conductor, and a data acquisition terminal 1 sandwiched between the upper and lower conductors. (See appendix) Figure 6 and attached Figure 7 In this embodiment, the upper conductor is the tab 2 on one battery cell, and the lower conductor is the tab 2 and the busbar on another battery cell.

[0050] The acquisition terminal 1 includes a welding plate 11 and a crimping part 12. The crimping part 12 is used to crimp and conduct with the signal acquisition harness, and the welding plate 11 is used to connect and conduct with the tab 2.

[0051] The difference in the forming process of this electrode connection structure compared to embodiment 1 is that the welding plate 11 of the acquisition terminal 1 is inserted between the two electrodes 2. This electrode connection structure can also achieve one-time welding and fixing of the acquisition terminal 1 and the electrodes 2, and the single-layer electrodes 2 in the upper conductor can also press the acquisition terminal 1, realizing the pre-positioning and fixing of the acquisition terminal 1 before welding, thus improving processing efficiency.

[0052] Compared to embodiment 1, since the acquisition terminal 1 is positioned higher and has only one layer of tabs 2 on top, the welding plate 11 of the acquisition terminal 1 is more likely to melt during the welding process, and its thickness can be slightly thicker.

[0053] See appendix Figure 8 In other embodiments of this implementation, the tabs 2 in the upper conductor and the tabs 2 in the lower conductor are tabs 2 on the same side, and the conductive busbar in the lower conductor is a lead-out conductive busbar 4.

[0054] Specific embodiment 4 of the electrode connection structure provided by this utility model:

[0055] This embodiment is described as Embodiment 3, and the difference between it and Embodiment 3 is as follows: see Appendix Figure 9 In this embodiment, the lower conductor only includes the tab 2 and does not include the conductive busbar.

[0056] This embodiment also allows the acquisition terminal 1 to be welded and fixed to the tab 2 in one step, and the acquisition terminal 1 is pressed and fixed by the tab 2 before welding. This embodiment does not have a conductive busbar, making it more suitable for low-current battery modules with low requirements for overcurrent capacity.

[0057] Specific embodiments of the battery module provided by this utility model:

[0058] The battery module includes battery cells, which are connected to each other via a tab connection structure as described in the above-described embodiment of the tab connection structure, or the battery cells lead out electrodes via a tab connection structure as described in the above-described embodiment of the tab connection structure.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. 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 tab connection structure, comprising an upper conductor and a lower conductor, wherein the upper conductor is at least one layer of tabs, and the lower conductor is a tab and / or a conductive bus, characterized in that, The electrode connection structure also includes a data acquisition terminal, which is sandwiched between the upper conductor and the lower conductor and soldered together with the upper conductor and the lower conductor.

2. The electrode connection structure according to claim 1, characterized in that, The lower conductor is a conductive busbar, and the upper conductor is at least one tab. The conductive busbar is provided with a receiving groove for accommodating the welding plate for accommodating the acquisition terminal. The depth of the receiving groove is equal to the thickness of the welding plate so that the top surface of the welding plate is flush with the top surface of the conductive busbar.

3. The electrode connection structure according to claim 2, characterized in that, The upper conductor consists of only one tab, while the lower conductor is a lead-out busbar used to bring out the electrodes to form the entire battery module.

4. The electrode connection structure according to any one of claims 1-3, characterized in that, The upper conductor is a tab on a battery cell, the lower conductor is a busbar and another battery cell with a tab pressed on top of the busbar, and the acquisition terminal is clamped between the tabs of the upper conductor and the lower conductor.

5. The electrode connection structure according to any one of claims 1-3, characterized in that, The upper conductor is a tab on one battery cell, and the lower conductor is a tab on another battery cell. The acquisition terminal is clamped between the tabs of the upper conductor and the lower conductor.

6. A battery module, comprising a battery cell, wherein the battery cell is connected to another battery cell via a tab connection structure or the battery cell leads out electrodes via the tab connection structure, the tab connection structure comprising an upper conductor and a lower conductor, the upper conductor being at least one layer of tabs, and the lower conductor being a tab and / or a conductive bus, characterized in that, The electrode connection structure also includes a data acquisition terminal, which is sandwiched between the upper conductor and the lower conductor and soldered together with the upper conductor and the lower conductor.

7. The battery module according to claim 6, characterized in that, The lower conductor is a conductive busbar, and the upper conductor is at least one tab. The conductive busbar is provided with a receiving groove for accommodating the welding plate for accommodating the acquisition terminal. The depth of the receiving groove is equal to the thickness of the welding plate so that the top surface of the welding plate is flush with the top surface of the conductive busbar.

8. The battery module according to claim 7, characterized in that, The upper conductor consists of only one tab, while the lower conductor is a lead-out busbar used to bring out the electrodes to form the entire battery module.

9. The battery module according to any one of claims 6-8, characterized in that, The upper conductor is a tab on a battery cell, the lower conductor is a busbar and another battery cell with a tab pressed on top of the busbar, and the acquisition terminal is clamped between the tabs of the upper conductor and the lower conductor.

10. The battery module according to any one of claims 6-8, characterized in that, The upper conductor is a tab on one battery cell, and the lower conductor is a tab on another battery cell. The acquisition terminal is clamped between the tabs of the upper conductor and the lower conductor.

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