A middle clamp plate of a soft package battery module

Abstract

The utility model discloses a kind of intermediate clamps of soft package battery module, it is related to intermediate clamps technical field, including soft package battery ontology, the both sides end of soft package battery ontology is equipped with tab, a root transition zone is equipped between two the tab and soft package battery ontology, fixed mechanism that it is positioned is equipped on soft package battery ontology, the upper and lower ends of fixed mechanism are equipped with horizontal baffle, in the present application, by setting up the fixed mechanism consisting of intermediate package frame and heightening pressure pad, replace the overall hard rubber filling in prior art, the rectangular hole of intermediate package frame can position soft package battery ontology, heightening pressure pad realizes stable fixation by multiple-point clamping root transition zone, avoid the problem that overall hard rubber fixed effect is not good, simultaneously, the gap between heightening pressure pad and cooperate aluminum nitride ceramic sheet on horizontal baffle, S-shaped radiating groove of vertical baffle, multiple-dimension radiating path is formed, effectively solve the poor heat dissipation and fixed effect difference when overall hard rubber filling fixation.

Description

Technical Field

[0001] This utility model relates to the field of intermediate clamping plate technology, and in particular to an intermediate clamping plate for a soft-pack battery module. Background Technology

[0002] Soft-pack lithium batteries typically refer to lithium batteries with an aluminum-plastic composite film casing. Due to their advantages such as light weight, low mold cost, and high safety, their market share is gradually expanding. In the event of a safety hazard, a soft-pack lithium battery will at most swell and crack.

[0003] In pouch battery modules, during high-frequency charging and discharging, the current tends to concentrate on the surface of the tabs (especially the root transition area), resulting in a local temperature rise that can be 1.5-2 times that of the main cell. In the current assembly process of pouch battery modules, a rigid adhesive is usually used to fill the surface of the tabs. However, this rigid adhesive filling method has obvious drawbacks: the rigid adhesive material itself has poor heat dissipation performance, which will hinder heat conduction, making it difficult for the heat generated by the pouch battery during operation to be effectively dissipated. Especially in high-frequency charging and discharging scenarios, the root transition area of ​​the tab is prone to local overheating due to heat accumulation. Utility Model Content

[0004] Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides an intermediate clamping plate for a pouch battery module. This solves the problem that during high-frequency charging and discharging, current tends to concentrate on the surface of the tabs (especially the root transition area), leading to localized temperature rises that can reach 1.5-2 times the temperature of the main cell. In existing pouch battery module assembly processes, a rigid adhesive is typically used to fill the tab surface. However, this rigid adhesive filling method has significant drawbacks: firstly, the rigid adhesive material itself has poor heat dissipation performance, hindering heat conduction and making it difficult to effectively dissipate the heat generated by the pouch battery during operation. Especially in high-frequency charging and discharging scenarios, the root transition area of ​​the tab is prone to excessively high localized temperatures due to heat accumulation. Secondly, the rigid adhesive fixing method lacks comprehensive battery positioning, resulting in poor fixing effects, difficulty in adapting to the deformation of the pouch battery during use, and inability to provide adequate battery protection.

[0006] Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A middle clamping plate for a pouch battery module includes a pouch battery body. Both ends of the pouch battery body are provided with tabs. A root transition area is provided between each of the two tabs and the pouch battery body. The pouch battery body is provided with a fixing mechanism for positioning. Both the upper and lower ends of the fixing mechanism are provided with transverse partitions. The transverse partitions and the fixing mechanism constitute a middle clamping plate for fixing, protecting and dissipating heat from the pouch battery body.

[0009] Preferably, the fixing mechanism includes two intermediate frames, each of which has a rectangular hole through it. The soft-pack battery body is installed between the two intermediate frames. The upper and lower end faces of the soft-pack battery body are both set in the rectangular holes opened in the intermediate frames. The opposite surfaces of the two intermediate frames are provided with high-pressure pads. The high-pressure pads provided in the two intermediate frames are fitted and installed at the upper and lower ends of the root transition area.

[0010] Preferably, the transverse partition has wedge-shaped grooves at both the upper and lower ends, the inner groove of the wedge-shaped groove of the transverse partition is 1.5mm higher than the heat dissipation groove and the inclination angle is 15°, and aluminum nitride ceramic sheets are installed in the wedge-shaped groove of the transverse partition by adhesive.

[0011] Preferably, a vertical partition is provided between every two sets of intermediate clamping plates. The vertical partition is used to laterally isolate the soft-pack battery body, and heat dissipation grooves are provided on the vertical partition.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In this new invention, a fixing mechanism consisting of a middle frame and a high-voltage pad is used to replace the overall rigid glue filling in the prior art. The rectangular hole of the middle frame can position the soft-pack battery body, and the high-voltage pad achieves stable fixing by clamping the root transition area at multiple points, avoiding the problem of poor fixing effect of the overall rigid glue. At the same time, the gap between the high-voltage pads and the aluminum nitride ceramic sheet on the horizontal partition and the S-shaped heat dissipation groove of the vertical partition form a multi-dimensional heat dissipation path, effectively solving the problems of poor heat dissipation and poor fixing effect when the overall rigid glue is used for fixing. Attached Figure Description

[0014] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0015] Figure 1 This is a structural diagram of the entire utility model;

[0016] Figure 2 This is a structural diagram of the transverse partition of this utility model;

[0017] Figure 3 This is a structural diagram of the intermediate frame of this utility model;

[0018] Figure 4 This is a structural diagram of the vertical partition of this utility model.

[0019] Legend: 1. Vertical partition; 2. Heat dissipation groove; 3. Horizontal partition; 4. Wedge groove; 5. Aluminum nitride ceramic sheet; 6. Intermediate frame; 7. Rectangular hole; 8. High voltage pad; 9. Soft-pack battery body; 10. Root transition area; 11. Tab. Detailed Implementation

[0020] This application provides an intermediate clamping plate for a pouch battery module, effectively solving the problem that in pouch battery modules, during high-frequency charging and discharging, the current tends to concentrate on the surface of the tabs (especially the root transition area), resulting in a local temperature rise that can reach 1.5-2 times that of the main cell. In the existing assembly process of pouch battery modules, a rigid adhesive is usually used to fill the surface of the tabs. However, this rigid adhesive filling method has obvious drawbacks: the rigid adhesive material itself has poor heat dissipation performance, which hinders heat conduction, making it difficult to effectively dissipate the heat generated by the pouch battery during operation. Especially in high-frequency charging and discharging scenarios, the root transition area of ​​the tab is prone to local overheating due to heat accumulation.

[0021] Example

[0022] like Figures 1-4 As shown, the technical solution in this application aims to effectively address the problem that in pouch battery modules, during high-frequency charging and discharging, current tends to concentrate on the surface of the tabs (especially the root transition area), resulting in a local temperature rise that can reach 1.5-2 times that of the main cell. In the existing assembly process of pouch battery modules, a rigid adhesive is typically used to fill the surface of the tabs. However, this rigid adhesive filling method has significant drawbacks: firstly, the rigid adhesive material itself has poor heat dissipation performance, hindering heat conduction and making it difficult to effectively dissipate the heat generated by the pouch battery during operation. Especially in high-frequency charging and discharging scenarios, the root transition area of ​​the tabs is prone to excessive local temperature rise due to heat accumulation. Secondly, the rigid adhesive fixing method lacks comprehensive battery positioning, resulting in poor fixing effect, difficulty in adapting to the deformation of the pouch battery during use, and inability to provide adequate battery protection. The overall approach is as follows:

[0023] To address the problems existing in the prior art, this utility model provides an intermediate clamping plate for a pouch battery module, including a pouch battery body 9. Both ends of the pouch battery body 9 are provided with tabs 11, and a root transition region 10 is provided between each tab 11 and the pouch battery body 9. Each pouch battery body 9 is welded together through the tabs 11 to complete the circuit. The root transition region 10 between the tabs 11 and the pouch battery body 9 is an extended part. The root transition region 10 can increase the cross-sectional area of ​​the current path and reduce the tortuosity of the electron transmission path.

[0024] The soft-pack battery body 9 is provided with a fixing mechanism for positioning. Both the upper and lower ends of the fixing mechanism are provided with transverse partitions 3. When installed, the transverse partitions 3 are respectively attached to the upper and lower ends of 19. When the soft-pack battery body 9 generates heat during use, the heat can be conducted through the transverse partitions 3. The transverse partitions 3 and the fixing mechanism form an intermediate clamp for fixing, protecting and dissipating heat from the soft-pack battery body 9.

[0025] The fixing mechanism includes two intermediate frames 6, each with a rectangular hole 7. The surface height of the soft-pack battery body 9 is exactly the same as the inner wall height of the rectangular hole 7 in the intermediate frame 6, so that the two intermediate frames 6 can completely enclose the soft-pack battery body 9 inside. This not only raises the position of the transition area 10 at the root of both sides of the soft-pack battery body 9, but also protects the other two sides of the soft-pack battery body 9.

[0026] Both intermediate frames 6 have high-voltage pads 8 on their opposite sides. The high-voltage pads 8 on both intermediate frames 6 are fitted to the upper and lower ends of the root transition area 10. There are a large number of high-voltage pads 8 on the intermediate frames 6, and there is a wide gap between each high-voltage pad 8. When the soft-pack battery body 9 is installed on the two intermediate frames 6, the multiple high-voltage pads 8 clamp the root transition area 10. While fixing the soft-pack battery body 9 and the root transition area 10, it can also ensure that the heat passing through the root transition area 10 is dissipated. Compared with the integrated heightening pad in the prior art, the high-voltage pads 8 in this device can both raise and fix the battery and dissipate heat, thereby solving the problem that "during high-frequency charging and discharging, the current is concentrated on the surface of the tab 11 (especially the root transition area 10), and the local temperature rise can reach 1.5-2 times that of the main body of the battery cell".

[0027] Both the upper and lower ends of the transverse partition 3 are provided with wedge-shaped grooves 4. The inner groove of the wedge-shaped groove 4 in the transverse partition 3 is 1.5mm higher than the heat dissipation groove and has an inclination angle of 15°. Aluminum nitride ceramic sheets 5 are installed in the wedge-shaped groove 4 in the transverse partition 3 by adhesive. Since the aluminum nitride ceramic sheets 5 set in the wedge-shaped groove 4 in the transverse partition 3 have high thermal conductivity (about 320W / m·K), the multiple sets of aluminum nitride ceramic sheets 5 not only increase the heat dissipation contact area but also optimize the heat conduction path, thereby reducing its internal thermal resistance.

[0028] A vertical partition 1 is provided between each pair of intermediate clamping plates. The vertical partition 1 is used to laterally isolate the soft-pack battery body 9. A heat dissipation groove 2 is provided on the vertical partition 1. The depth of the heat dissipation groove 2 on the vertical partition 1 is 0.8mm, and it is filled with a high thermal conductivity phase change material (such as paraffin / expanded graphite composite). The heat dissipated by the aluminum nitride ceramic sheet 5 on the transverse partition 3 will come into contact with the high thermal conductivity phase change material in the heat dissipation groove 2, thereby dissipating heat.

[0029] Among them, the vertical partition 1, the horizontal partition 3 and the middle frame 6 are all made of epoxy board. Epoxy resin board is a board product made of epoxy resin, also known as insulation board, epoxy board or 3240 epoxy board. Epoxy resin board has the characteristics of strong adhesion and strong shrinkage.

[0030] Working principle:

[0031] The first step is to place the soft-pack battery body 9 between the two intermediate frames 6, so that the end faces of the upper and lower ends of the soft-pack battery body 9 are embedded in the rectangular holes 7 of the intermediate frames 6, thereby achieving the initial positioning of the soft-pack battery body 9. The high-pressure pads 8 on the opposite surfaces of the intermediate frames 6 are attached to the upper and lower ends of the root transition area 10. Through the clamping action of multiple high-pressure pads 8, the root transition area 10 is raised and fixed. At the same time, the gaps between the high-pressure pads 8 provide a channel for the heat dissipation of the root transition area 10.

[0032] The second step is to install transverse partitions 3 at the upper and lower ends of the fixing mechanism, so that they are respectively attached to the upper and lower ends of the soft-pack battery body 9. Aluminum nitride ceramic sheets 5 are installed in the wedge-shaped grooves 4 at the upper and lower ends of the transverse partitions 3 by adhesive. Taking advantage of the high thermal conductivity (about 320W / m·K) of aluminum nitride ceramic sheets, the heat dissipation contact area is increased, the heat conduction path is optimized, and the thermal resistance is reduced, so that the heat generated by the soft-pack battery body 9 during operation is conducted away through the transverse partitions 3.

[0033] The third step involves installing a vertical partition 1 between each pair of intermediate clamping plates to laterally isolate the soft-pack battery body 9 and prevent mutual interference between adjacent soft-pack battery bodies 9. An S-shaped heat dissipation groove 2 with a depth of 0.8 mm is opened on the vertical partition 1 and filled with a high thermal conductivity phase change material (such as paraffin / expanded graphite composite). The heat emitted from the aluminum nitride ceramic sheet 5 on the horizontal partition 3 comes into contact with the high thermal conductivity phase change material in the heat dissipation groove 2. Through the heat absorption and heat dissipation process of the phase change material, the heat is further dissipated, improving the heat dissipation effect.

[0034] The fixing mechanism, the horizontal partition 3, and the vertical partition 1 work together to form an overall structure that fixes, protects, and dissipates heat from the soft-pack battery body 9. The middle frame 6 and the booster pad 8 ensure the fixation of the soft-pack battery body 9 and the heat dissipation of the root transition area 10. The horizontal partition 3 and the aluminum nitride ceramic sheet 5 optimize the heat conduction path, and the vertical partition 1 and the heat dissipation groove 2 enhance heat dissipation. Together, they ensure that the soft-pack battery module maintains a stable temperature during operation, avoiding the impact on battery performance and lifespan due to excessively high local temperatures, while also providing good protection for the soft-pack battery body 9.

[0035] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A middle clamping plate for a soft-pack battery module, comprising a soft-pack battery body (9), wherein tabs (11) are provided at both ends of the soft-pack battery body (9), and a root transition area (10) is provided between the two tabs (11) and the soft-pack battery body (9). Its features are: The soft-pack battery body (9) is provided with a fixing mechanism for positioning. Both the upper and lower ends of the fixing mechanism are provided with transverse partitions (3). The transverse partitions (3) and the fixing mechanism form an intermediate clamp for fixing, protecting and dissipating heat from the soft-pack battery body (9). The fixing mechanism includes two intermediate frames (6), and each of the two intermediate frames (6) has a rectangular hole (7) through it. The soft-pack battery body (9) is installed between two intermediate frames (6), and the end faces of the upper and lower ends of the soft-pack battery body (9) are both set in the rectangular holes (7) opened in the intermediate frames (6); The two intermediate frames (6) are provided with pressure-increasing pads (8) on their opposite sides, and the pressure-increasing pads (8) provided on the two intermediate frames (6) are fitted and installed at the upper and lower ends of the root transition area (10); The transverse partition (3) has wedge-shaped grooves (4) at both its upper and lower ends. The inner groove of the wedge-shaped groove (4) opened in the transverse partition (3) is 1.5 mm high and has an inclination angle of 15°. Aluminum nitride ceramic sheets (5) are installed in the wedge-shaped groove (4) of the transverse partition (3) by adhesive. A vertical partition (1) is provided between each two sets of intermediate clamps, and the vertical partition (1) is used to laterally isolate the soft-pack battery body (9); The vertical partition (1) is provided with heat dissipation grooves (2).

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