Battery pack binding tape and battery module

Abstract

The utility model relates to a battery pack binding belt, which comprises a steel belt body, which comprises a first steel belt and a second steel belt, the first steel belt and the second steel belt are welded at the head and tail to form a binding space for binding the battery pack, a clamping groove is formed at the welding position of the first steel belt, a boss is formed at the welding position of the second steel belt, the boss is located in the clamping groove after the first steel belt and the second steel belt are welded, the first steel belt and the second steel belt are connected through welding at the left and right sides of the matching position of the boss and the clamping groove, the boss is located in the clamping groove, the matching of the boss and the clamping groove increases the tension between the first steel belt and the second steel belt, so that the current during welding can be reduced, the welding damage on the surface of the first steel belt and the second steel belt can be reduced, and the welding force of the first steel belt and the second steel belt is finally unchanged.

Description

Technical Field

[0001] This utility model relates to cable ties, and in particular to battery pack cable ties and battery modules. Background Technology

[0002] The battery module assembly process follows a three-step process: "shaping - bundling - curing". First, the stacked battery cells are placed in a pressurizing device, where precise pressure control ensures that key dimensions such as module thickness and flatness meet design standards. Second, steel straps are used to bundle the module along a pre-defined path, creating mechanical constraints. Third, the bundled modules are baked to cure the bonding material between the cells, achieving a strong bond. This steel strapping method reduces the complexity of module assembly and, through the slight elastic deformation of the straps, accommodates the expansion effects of the cells during charging and discharging, preventing damage to the module structure.

[0003] Conventional battery strapping uses welding to bind the battery pack by welding the two ends of the steel strip body. In order to increase the welding force, the welding current needs to be increased for thicker welds. This can cause weld damage to the surface of the strapping at the weld, and it is also easy to form weld seams, which can lead to future oxidation.

[0004] In summary, ensuring the weldability of strapping straps while avoiding weld damage on their surface has become an urgent problem for researchers in this field. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: how to ensure the welding force of the strapping while avoiding weld damage on the surface of the strapping. To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This utility model is a battery pack bundling strap, comprising: a steel strip body, which includes a first steel strip and a second steel strip, the first steel strip and the second steel strip are welded end to end to form a bundling space for bundling the battery pack; a groove is provided at the weld of the first steel strip, and a boss is provided at the weld of the second steel strip, and when the first steel strip and the second steel strip are welded, the boss is located in the groove.

[0006] Furthermore, the cross-sectional area of ​​the slot matches the cross-sectional area of ​​the boss.

[0007] Furthermore, the first steel strip has a first positioning hole, the second steel strip has a second positioning hole, the boss is located in the slot, and the first positioning hole and the second positioning hole are concentric.

[0008] Furthermore, the second steel strip has multiple weld points protruding from its end face facing the first steel strip.

[0009] Furthermore, the welding points are formed by welding the first steel strip and the second steel strip together using resistance welding.

[0010] Furthermore, the steel strip body is made of stainless steel.

[0011] This utility model also discloses a battery module, including a strapping band and multiple battery cells arranged sequentially in the front-to-back direction and glued together; the battery pack strapping band binds the multiple battery cells in the binding space.

[0012] The beneficial effects of this utility model are as follows: This utility model is a battery pack bundling strap and a battery module. The first steel strip and the second steel strip are connected by welding on both sides of the boss and the slot. The boss is located in the slot. The cooperation between the boss and the slot increases the tension between the first steel strip and the second steel strip. This reduces the welding current and reduces the weld damage on the surface of the first steel strip and the second steel strip, ultimately ensuring that the welding force of the first steel strip and the second steel strip remains unchanged. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a cross-sectional view of the first and second steel strips before welding. Figure 2 This is a cross-sectional view of the first and second steel strips after welding. Figure 3 This is a schematic diagram of the surface structure of the first steel strip; Figure 4 This is a schematic diagram of the surface structure of the second steel strip. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0016] See Figure 1-2 This embodiment is a battery pack bundling strap, including a steel strip body made of stainless steel. The steel strip body includes a first steel strip 1 and a second steel strip 2. The first steel strip 1 and the second steel strip 2 are welded end to end to form a bundling space for bundling the battery pack. The first steel strip 1 is disposed on the upper part of the second steel strip 2, and the two are connected by welding. A slot 11 is provided through the first steel strip 1, and a boss 21 protrudes from the upper surface of the second steel strip 2. When the first steel strip 1 and the second steel strip 2 are in the welding state, the boss 21 is located in the slot 11 to increase the tensile strength after the first steel strip 1 and the second steel strip 2 are welded. In this embodiment, the first steel strip 1 and the second steel strip 2 are connected by welding on both sides of the mating part of the boss 21 and the slot 11. The boss 21 is located in the slot 11. The mating of the boss 21 and the slot 11 increases the tension between the first steel strip 1 and the second steel strip 2, which can reduce the welding current. The reduced current prevents weld damage on the surface of the first steel strip 1 and the second steel strip 2, and ultimately keeps the welding force of the first steel strip 1 and the second steel strip 2 unchanged. In addition, the first steel strip 1 and the second steel strip 2 can be set on the same steel strip body or on two different steel strip bodies.

[0017] In some possible implementations, when the boss is located in the slot, in order to avoid displacement of the relative positions of the first steel strip 1 and the second steel strip 2, this embodiment uses the cross-sectional area of ​​the slot 11 to match the cross-sectional area of ​​the boss 21. In this embodiment, since the cross-sectional area of ​​the slot 11 and the cross-sectional area of ​​the boss 21 are the same, the boss 21 is located inside the slot 11. When the boss 21 and the slot 11 are engaged, the relative positions of the first steel strip 1 and the second steel strip 2 will not change.

[0018] See Figure 1-2 In some possible implementations, the welder cannot visually observe whether the boss is engaged with the slot. To solve the above problem, this embodiment adopts a first positioning hole 12 on the first steel strip 1 and a second positioning hole 22 on the second steel strip 2. The boss 21 is located in the slot 11, and the first positioning hole 12 and the second positioning hole 22 are concentric. When the first positioning hole 12 and the second positioning hole 22 are concentric, the welding personnel can know that the boss 21 has cooperated with the slot 11, and then the welding between the first steel strip 1 and the second steel strip 2 can be carried out.

[0019] See Figure 3-4 In some possible implementations, in order to illustrate how the welding between the first steel strip and the second steel strip is achieved after the boss and the slot are engaged, this embodiment adopts a plurality of welding points 23 protruding from the end face of the second steel strip 2 facing the first steel strip 1; the welding points 23 are used to weld the first steel strip 1 and the second steel strip 2 by resistance welding. In this embodiment, the surface of the first steel strip 1 facing upwards and the second steel strip 2 has protruding welding points 23. Three welding points 23 are arranged on the left side of the second positioning hole 22, and the other three welding points 23 are arranged on the right side of the second positioning hole 22. The first steel strip 1 and the second steel strip 2 are welded together by melting the welding points 23 through resistance welding.

[0020] This embodiment also discloses a battery module. In the battery module, multiple cells are connected by mutual adhesive bonding. After the steel strip body wraps around the multiple cells, the boss is located behind the slot. Finally, the first steel strip and the second steel strip are welded by resistance welding. Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A battery pack bundling strap, characterized in that, include: The steel strip body includes a first steel strip and a second steel strip, which are welded end to end to form a bundling space for bundling the battery pack. The first steel strip has a groove at the weld joint, and the second steel strip has a boss at the weld joint. After the first steel strip and the second steel strip are welded, the boss is located in the groove.

2. The battery pack strapping according to claim 1, characterized in that, The cross-sectional area of ​​the slot matches the cross-sectional area of ​​the boss.

3. The battery pack bundling strap according to claim 1, characterized in that, The first steel strip has a first positioning hole, the second steel strip has a second positioning hole, the boss is located in the slot, and the first positioning hole and the second positioning hole are concentric.

4. The battery pack bundling strap according to claim 1, characterized in that, The second steel strip has multiple weld points protruding from its end face toward the first steel strip.

5. The battery pack bundling strap according to claim 4, characterized in that, The welding points are formed by welding the first steel strip and the second steel strip together using resistance welding.

6. The battery pack bundling strap according to claim 1, characterized in that, The steel strip body is made of stainless steel.

7. A battery module, comprising the battery pack strapping as described in any one of claims 1-6, characterized in that, Also includes: Multiple battery cells arranged sequentially along the front-to-back direction and glued together; The battery pack strapping binds multiple battery cells within the binding space.

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