Battery device for limiting expansion of module

Abstract

A battery device for limiting module expansion relates to the technical field of new energy automobile batteries and comprises end plates arranged at two ends of a battery module, a plurality of tension springs are arranged between the two end plates, and the battery module is composed of a plurality of cells which are tightly attached. According to the utility model, the end plates are arranged at the two ends of the battery module, and the tension springs of which the initial states are loose states are arranged between the end plates, so that after the battery module is expanded in the charging and discharging processes, the tension springs generate reset elastic force, and the elastic force direction is from the two ends to the middle, so that the size change caused by the expansion force of the battery is reduced; the tension spring is arranged on the side edge of the battery module instead of one end of the battery module, so that the space volume occupied by the whole device is effectively reduced, a vehicle with the same volume can carry more battery modules, and the endurance of the vehicle is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicle batteries, in particular to a battery device for limiting module expansion. Background Art

[0002] During the design and production of new energy vehicle battery modules, existing modules expand and grow in size after repeated charge and discharge cycles. Currently, most modules utilize clamps or welded side and end panels. If the expansion force exceeds a certain level, the clamps on the module risk breaking, and the welds risk cracking.

[0003] In the related art, the soft-pack battery module with internal delayed expansion resistance disclosed in publication number CN215578752U includes an upper cover plate, a soft-pack battery cell, a connector, an outer shell, an elastic element and a support member; the soft-pack battery cells are connected through the support member to improve the stability of the overall structure; multiple soft-pack battery cells are connected in series or parallel to form a battery unit, and multiple soft-pack battery cells and the support member are externally connected to the elastic element, which can effectively delay the expansion of the soft-pack battery cell when used together.

[0004] Although the above-mentioned existing technical solution can prevent the expansion of the battery module after charging and discharging, and avoid the risk of the clamp on the module being pulled off and the weld cracking, it still has the following defects: in the embodiment of this solution, the elastic element adopts a compression spring, which is arranged at the end of the battery module, so that the overall device occupies a large volume and the space utilization rate is low. Utility Model Content

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A battery device for limiting module expansion includes end plates arranged at both ends of the battery module, a plurality of tension springs arranged between the end plates, and the ends of the tension springs are respectively fixedly connected to the end plates; the battery module is composed of a plurality of tightly fitted battery cells.

[0007] Furthermore, a group of tension springs is provided on each side of the battery module, and each group includes two tension springs.

[0008] Furthermore, a reinforcing plate is fixedly provided at the connection between the outer side of the end plate and the tension spring, and both ends of the tension spring pass through the end plate and the reinforcing plate in sequence.

[0009] Furthermore, both ends of the tension spring are hooks, the end plate is provided with a first hanging hole for matching with the hook, and the reinforcing plate is provided with a second hanging hole for matching with the hook.

[0010] Furthermore, a screw is provided between the end plates to prevent the battery cells from being misplaced. Both ends of the screw pass through the end plates and the reinforcing plates in sequence, and nuts are sleeved on both ends of the screw.

[0011] Furthermore, the end plate is provided with a first through hole for the screw to pass through, and the reinforcing plate is provided with a second through hole for the screw to pass through.

[0012] Compared with the prior art, the beneficial effects produced by the present invention are:

[0013] 1. The present invention arranges end plates on the left and right sides of the battery module and arranges a tension spring between the end plates, which is initially in a relaxed state. After the battery module expands during charging and discharging, the tension spring generates a restoring elastic force, and the direction of the elastic force is from the two ends to the middle, thereby reducing the dimensional change caused by the battery expansion force. The tension spring is arranged on the side of the battery module rather than the end of the battery module. This layout effectively reduces the space occupied by the entire device, allowing a vehicle of the same volume to carry more battery modules, thereby extending the vehicle's range.

[0014] 2. This utility model features two sets of tension springs, each of which is positioned on either side of the battery module. A reinforcement plate is fixed to the outer side of the end plate where the tension springs are mounted. Hooks at either end of the tension springs penetrate the end plate and reinforce the plate, securing them together and preventing them from falling out. This design uses multiple tension springs to counteract the expansion force generated by the battery module after charging and discharging. The reinforcement plate ensures more uniform force transmission during the tension spring loading process, resolving the issue of high localized pressure on the end plate and enhancing the reliability of the overall structure.

[0015] 3. The present invention also incorporates a screw between the end plates, with nuts fitted at both ends to prevent horizontal or vertical misalignment of the cells that make up the battery module. Furthermore, this solution offers a simpler structure, shortening production cycles, saving costs, and improving economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the present utility model.

[0017] Figure 2 This is a schematic diagram of the explosion structure of the utility model.

[0018] Among them, the numbers in the figure are: battery cell 10, end plate 20, first hanging hole 21, first through hole 22, tension spring 30, hook 31, screw 40, nut 41, reinforcement plate 50, second hanging hole 51, second through hole 52. DETAILED DESCRIPTION

[0019] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0020] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0021] Reference Figure 1 and Figure 2 , a battery device that limits the expansion of the module, the battery module is composed of a number of battery cells 10 tightly fitted together, and the battery device includes end plates 20 arranged at both ends of the battery module, and a number of tension springs 30 arranged between the two end plates 20. In this embodiment, the two ends of the tension spring 30 are hooks 31, which are fixedly connected to the end plate 20 through the hooks 31. The end plate 20 is provided with a first hanging hole 21 for the hook 31 to hang. The tension spring 30 is arranged on one side of the battery module, and its initial state is a relaxed state. When the battery module expands after multiple charges and discharges, its size becomes larger and expands toward both ends, and the two ends of the tension spring 30 are pulled apart, thereby causing deformation. The elastic force generated by the deformation of the tension spring 30 acts from the two ends to the middle, tightening the two ends of the expanded battery module, thereby offsetting the risks brought about by the dimensional changes caused by the expansion of the battery module.

[0022] Reference Figure 1 and Figure 2 In this embodiment, a set of tension springs 30 is preferably arranged on either side of the battery module, with each set comprising two tension springs 30. A reinforcing plate 50 is provided at the junction of the outer side of the end plate 20 and the tension spring 30. The reinforcing plate 50 has a second hook hole 51 for engaging the hook 31 of the tension spring 30. The provision of the reinforcing plate 50 ensures more uniform force transmission during the tension spring 30's application, thereby improving device reliability. Specifically, the reinforcing plate 50 is secured to the end plate 20 by welding.

[0023] Reference Figure 1 and Figure 2 Screws 40 are also provided between the end plates 20 on either side of the battery module to prevent the battery cells 10 from shifting horizontally or vertically during vehicle operation. In this embodiment, a screw 40 is provided on each side of the battery module, and the two screws 40 are arranged between a set of tension springs 30. The ends of the screws 40 pass through the end plates 20 and the reinforcement plates 50, respectively, and are then screwed to nuts 41. The end plates 20 are provided with first through-holes 22 for the screws 40 to pass through, and the reinforcement plates 50 are provided with second through-holes 52 for the screws 40 to pass through.

[0024] Reference Figure 1 and Figure 2 , and a second through hole 52 for the screw 40 to pass through. The two ends of the screw 40 pass through the end plate 20 and the reinforcing plate 50 in sequence, and are then connected with nuts 41 for fixing to prevent the screw 40 from loosening. The hooks 31 at both ends of the tension spring 30 hook the end plate 20 and the reinforcing plate 50 at the same time. During assembly, at least one nut 41 threaded on the end of the screw 40 is not tightly fitted with the reinforcing plate 50, leaving a certain deformation space for the tension spring 30. In this embodiment, the four tension springs 30 arranged on both sides of the battery module jointly reduce the expansion force generated by the charging and discharging of the battery module, thereby avoiding excessive wear between the nut 41 at the end of the screw 40 and the thread of the screw 40 caused by the expansion of the battery module.

[0025] During use, the tension spring 30 and screw 40 are located on one side of the battery module rather than at one end, reducing the space occupied by the entire device. This allows a vehicle of the same volume to carry more battery modules, resulting in a longer range. Furthermore, this embodiment offers a simpler structure, shortening production cycles, reducing production costs, and improving economic efficiency.

[0026] The above is only a specific implementation method of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A battery device for limiting module expansion, characterized in that: It includes end plates arranged at both ends of the battery module and several tension springs arranged between the two end plates. The two ends of the tension springs are fixedly connected to the end plates respectively. The battery module is composed of several battery cells tightly fitted together.

2. A battery device for limiting module expansion according to claim 1, characterized in that: A group of tension springs is respectively arranged on both sides of the battery module, and each group includes two tension springs.

3. The battery device for limiting module expansion according to claim 2, characterized in that: A reinforcing plate is fixedly provided at the connection between the outer side of the end plate and the tension spring, and both ends of the tension spring pass through the end plate and the reinforcing plate in sequence.

4. The battery device for limiting module expansion according to claim 3, characterized in that: Both ends of the tension spring are hooks, the end plate is provided with a first hanging hole for matching the hook, and the reinforcing plate is provided with a second hanging hole for matching the hook.

5. The battery device for limiting module expansion according to claim 3, wherein: A screw rod for preventing the battery core from being misplaced is also provided between the end plates. Both ends of the screw rod pass through the end plates and the reinforcing plates in sequence. Nuts are sleeved on both ends of the screw rod.

6. The battery device for limiting module expansion according to claim 5, characterized in that: The end plate is provided with a first through hole for the screw to pass through, and the reinforcing plate is provided with a second through hole for the screw to pass through.

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