Busbar structural member capable of being bent, clamped and welded

Abstract

The utility model relates to the technical field of battery capacitors, in particular to a busbar structural member capable of being bent, clamped and welded, which comprises a busbar body, the busbar body comprises an upper part and a lower part, the upper part and the lower part are provided with through holes for assembly, the lower part is wider than the upper part, and the wider part is a bent part which is connected with foil and can be bent. By adopting the technical scheme, the space utilization rate of the capacitor can be improved, and the internal resistance problem caused by poor welding is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery capacitor technology, specifically to a busbar structure that can be bent, clamped, and welded. Background Technology

[0002] A capacitor includes the battery cell, negative terminal, and positive connector. The capacitor uses a laminated battery cell with a full tab structure, requiring foil on both sides to act as tabs. This increases the overall length of the battery cell by 10-15%. Commonly available soldering methods use clamping tab soldering, for example: Figure 1 As shown, after the foil material at both ends is pressed firmly, it is clamped and welded through the busbars extending upwards; or, for example, after the foil material on both sides is pressed firmly, it is clamped and welded through the busbars extending left and right. The welding of the foil material and the busbars often occupies a lot of space, which not only affects the space utilization of the capacitor, but also affects the performance of the capacitor. Utility Model Content

[0003] The present invention aims to provide a busbar structure that can be bent and clamped for welding, so as to improve the space utilization of capacitors.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: it includes a busbar body, which includes an upper part and a lower part. Both the upper and lower parts are provided with through holes for assembly. The lower part is wider than the upper part, and the wider part is a bending part that can be bent to hold foil.

[0005] The technical advantages of this solution are:

[0006] 1. Optimize volume constraints: During assembly, the busbar plane is placed perpendicular to the foil plane. After the busbar is bent and clamped to the foil, the busbar plane is parallel to the foil plane, thereby saving space, improving space utilization, and indirectly improving energy density.

[0007] 2. Reduced process complexity: The busbar component uses only simple mechanical and ultrasonic equipment to tightly clamp the foil at the bend, and then uses laser welding to fix the busbar and the foil. The simple bending structure reduces the complexity of the production process.

[0008] 3. Improved mechanical reliability: The elastic deformation of the bending clamping structure can absorb external vibration energy, and the mechanical clamping force is evenly distributed, rather than the stress concentrated by spot welding, which improves the resistance to mechanical impact and vibration.

[0009] 4. Reduced defect rate and improved consistency: The bending and clamping process simplifies the precise alignment steps required for traditional all-tab welding, and the mechanical clamping tolerance can be widened to ±0.2mm (traditional laser welding requires ±0.05mm), reducing internal resistance problems caused by welding defects;

[0010] 5. Thermal management optimization: The bending and clamping structure of the busbar can increase the contact area with the electrode foil, forming a multi-path heat conduction channel. Through the high thermal conductivity of the metal material (such as copper or aluminum), heat is quickly transferred from the electrode sheet to the shell or external heat dissipation system, avoiding local hot spots, resulting in a more uniform temperature distribution and delaying electrolyte aging.

[0011] 6. Reduced costs: The relatively simple connection process between the busbar and the foil reduces equipment and production costs.

[0012] Preferably, as an improvement, the width of the bend is half the width of the upper part.

[0013] Preferably, as an improvement, the upper through hole is an upper circular hole and the lower through hole is a lower circular hole. The upper circular hole is used for assembling and welding the negative electrode lead-out terminal or the positive electrode connector, and the lower circular hole is used for assembling and welding the positive electrode connector.

[0014] Preferably, as an improvement, the foil also includes a bendable portion that is connected to the busbar body.

[0015] Preferably, as an improvement, the bent portion of the foil is provided with a receiving groove, one end of the negative lead terminal is located in the receiving groove and the other end of the negative lead terminal is clamped between the upper part and the bent portion of the foil.

[0016] The technical effect of this solution is that it helps to improve the stability and firmness of the negative lead terminal. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection structure between the existing busbar and the foil described in the background art;

[0018] Figure 2 This is a side view of the busbar according to an embodiment of the present invention;

[0019] Figure 3 This is a three-dimensional exploded view of the busbar and foil after bending according to an embodiment of this utility model;

[0020] Figure 4 This is a three-dimensional view of the busbar and foil after bending in an embodiment of this utility model;

[0021] Figure 5 This is a front view of the busbar according to an embodiment of the present invention. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The reference numerals in the accompanying drawings include: upper part 1, lower part 2, upper round hole 3, lower round hole 4, negative lead-out terminal 5, bent part 6, foil 7.

[0024] The basic implementation examples are as follows: Figure 1-5 As shown: Figure 2 , 5 The diagram shows a bendable, clamping, and welding busbar structure, comprising a busbar body, an upper part 1, and a lower part 2, both of which have through holes for assembly; wherein the through hole in the upper part 1 is an upper circular hole 3, and the through hole in the lower part 2 is a lower circular hole 4, the upper circular hole 3 being used for... Figure 4 The negative lead terminal 5 shown can be used for assembly and welding, and can also be used for assembly and welding of the positive connector. The lower circular hole 4 is used to assemble and weld the positive connector. The positive connector is a gas storage device used to store the gas generated by the capacitor. It is not the focus of this patent and will not be described in detail here.

[0025] like Figure 2 , 5 As shown, the lower part 2 is wider than the upper part 1, and the wider portion is a bending part 6 connected to the foil 7 and capable of being mechanically bent. The width of the bending part 6 is approximately half the width of the upper part 1; Figure 3 As shown, the foil 7 also includes a bending portion 6 that is connected to the busbar body and can be mechanically bent. After the bending portions 6 of the two are bent and clamped together, they can be tightly welded together. Figure 4 The state shown is compared to Figure 1 The structure shown is more space-saving.

[0026] In addition, such as Figure 4 As shown, a receiving groove is opened on the bent portion 6 of the foil 7, one end of the negative lead terminal 5 is located in the receiving groove and the other end of the negative lead terminal 5 is clamped between the upper part 1 and the bent portion 6 of the foil 7. The foil 7 is a structure formed after the reserved extension sections at both ends of the battery cell are compacted.

[0027] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A busbar structure capable of bending, clamping, and welding, characterized in that: The busbar body includes an upper part and a lower part, both of which are provided with through holes for assembly. The lower part is wider than the upper part, and the wider part is a bent part that can be connected to the foil and can be bent.

2. A busbar structure capable of bending, clamping, and welding according to claim 1, characterized in that: The width of the bent section is half the width of the upper section.

3. A busbar structure capable of bending, clamping, and welding according to claim 2, characterized in that: The upper through hole is an upper round hole, and the lower through hole is a lower round hole. The upper round hole is used for assembling and welding the negative lead-out terminal or the positive connector, and the lower round hole is used for assembling and welding the positive connector.

4. A busbar structure capable of bending, clamping, and welding according to claim 3, characterized in that: The foil also includes a bendable portion that is connected to the busbar body.

5. A busbar structure capable of bending, clamping, and welding according to claim 4, characterized in that: The bent portion of the foil is provided with a receiving groove, one end of the negative lead terminal is located in the receiving groove and the other end of the negative lead terminal is clamped between the upper part and the bent portion of the foil.

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