A lithium battery pack heat exchanger bonding and fixing structure

Abstract

This utility model discloses a bonding and fixing structure for a heat spreader plate of a lithium battery pack, belonging to the technical field of lithium battery packs. It includes a battery cell, a heat spreader plate, and a vertical plate. The heat spreader plate and the battery cell are connected by an L-shaped elastic tenon and a mortise, and are positioned by wedge-shaped bosses and wedge-shaped grooves. The vertical plate contains an elastic locking assembly, including a fixing shell, a telescopic rod, a return spring, and a connecting plate. The connecting plate elastically engages with the connecting groove on the side wall of the assembly, achieving tool-free quick fixing. The structure also includes a sealing mechanism, including a sealing strip, a mounting groove, an elastic buffer sleeve, a labyrinth-type dustproof channel, a glue storage tank, a water-swellable silicone-based sealing ring, and a ventilation assembly containing a waterproof membrane and micro-vents. This utility model has the beneficial effects of efficient assembly, stable connection, reliable sealing, and heat dissipation, improving the environmental adaptability and service life of the lithium battery pack.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery pack technology, and in particular to a structure for bonding and fixing a heat spreader plate in a lithium battery pack. Background Technology

[0002] With the rapid development of new energy technologies, lithium batteries, as key components in electric vehicles and energy storage power stations, are receiving increasing attention for their performance and safety. Lithium batteries generate heat during operation. If the heat cannot be dissipated in a timely and uniform manner, it will lead to local overheating of the battery, affecting the battery's cycle life and even causing safety accidents. Therefore, a heat exchanger is installed in the lithium battery pack to improve the battery's temperature uniformity and heat dissipation efficiency.

[0003] However, in existing technologies, the bonding and fixing of the heat spreader plate and the battery cell are usually achieved using two main methods. One method is mechanical fastening with bolts. Although this method can provide a certain degree of fixing strength, in actual production, the installation and removal of bolts requires a lot of time and manpower, and special tools are needed, resulting in low assembly efficiency. In addition, bolted connections are prone to loosening under long-term vibration or thermal expansion and contraction, which affects the bonding effect between the heat spreader plate and the battery cell, thereby reducing heat dissipation efficiency and battery pack reliability. The other method is adhesive bonding. This method may be simpler during initial assembly, but its connection strength and long-term stability are often insufficient. Especially in high-temperature and humid environments, the adhesive layer is prone to aging and failure, causing the heat spreader plate to fall off. More importantly, once battery pack maintenance or cell replacement is required, removing the bonded heat spreader plate will be very difficult and may easily damage components, causing great inconvenience to maintenance.

[0004] Besides the issues with connection and fixation, existing lithium battery packs also have shortcomings in adaptability to external environments. As precision electronic components, lithium batteries are highly sensitive to impurities such as humidity and dust. In humid and dusty working environments, connection gaps or incompletely sealed structures become channels for impurities to enter, leading to contamination of the internal medium of the battery and causing problems such as short circuits and corrosion. This seriously affects the safety, performance, and lifespan of the battery pack. At the same time, although sealing is necessary to prevent the influence of the external environment, the battery continuously generates heat during charging and discharging. A completely sealed structure will hinder heat dissipation, resulting in excessively high internal temperatures and creating new safety hazards. How to achieve high-strength sealing protection while ensuring internal heat dissipation has become a key problem that urgently needs to be solved in the current structural design of lithium battery packs.

[0005] Therefore, this utility model proposes a bonding and fixing structure for a lithium battery pack heat spreader, aiming to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems of cumbersome assembly and disassembly, insufficient connection reliability, and weak overall sealing and protection of the existing lithium battery pack heat exchanger bonding and fixing structure using bolts or adhesive backing, this utility model aims to provide a lithium battery pack heat exchanger bonding and fixing structure with improved structure that can effectively solve the above problems.

[0007] This utility model provides a lithium battery pack heat exchanger bonding and fixing structure, including: a battery cell, a battery heat exchanger plate disposed on the upper and lower sides of the battery cell, and a vertical plate clamping the left and right sides of the assembly formed by the battery cell and the battery heat exchanger plate.

[0008] The battery heat spreader is connected to the battery cell via a connection mechanism. This connection mechanism includes an L-shaped elastic tenon on the battery heat spreader and a mortise on the battery cell that engages with the L-shaped elastic tenon. The connection mechanism also includes a limiting groove on the inner wall of the vertical plate and an elastic locking component housed in the limiting groove. The elastic locking component includes a fixed shell, a telescopic rod, a return spring, and a connecting plate. The connecting plate is driven by the return spring and can elastically extend and retract into the connecting groove on the side wall of the assembly.

[0009] Preferably, a positioning component is provided between the battery heat spreader and the battery cell. The positioning component includes a wedge-shaped boss on the battery heat spreader and a wedge-shaped groove on the battery cell that slides with the wedge-shaped boss.

[0010] Preferably, the present invention also includes a sealing mechanism, which includes a sealing strip disposed on the outside of the connection between the battery heat spreader and the battery cell.

[0011] Preferably, a mounting groove is formed on the outer side of the connection between the battery heat spreader and the battery cell, and the sealing strip is accommodated in the mounting groove.

[0012] Preferably, the sealing mechanism further includes an elastic buffer sleeve, which is fixedly installed on the inner side of the upright plate and wraps around the left and right sides of the assembly.

[0013] Preferably, the inner wall of the elastic cushioning sleeve has a labyrinth-style dustproof channel.

[0014] Preferably, the inner wall of the elastic buffer sleeve is also provided with a glue storage groove, and a water-swellable silicone-based sealing ring is placed in the glue storage groove.

[0015] Preferably, the elastic cushioning sleeve is further provided with a ventilation component, which includes a waterproof membrane covering the inner wall of the elastic cushioning sleeve and micro ventilation holes opened on the outer wall of the elastic cushioning sleeve.

[0016] This utility model has the following beneficial effects: 1. This utility model solves the problems of cumbersome assembly and disassembly, low efficiency and insufficient connection reliability caused by the use of bolts or adhesive backing in the prior art by setting a double connection mechanism consisting of an L-shaped elastic tenon, a mortise and tenon and an elastic locking component. It achieves the technical effect of quick assembly without tools, stable connection and strong vibration resistance, which significantly improves production efficiency and service life of the device.

[0017] 2. This utility model solves the problem of poor sealing performance and susceptibility to external environmental influences in existing battery pack structures by setting up a multi-composite sealing mechanism consisting of sealing strips, elastic buffer sleeves, labyrinth-type dustproof channels, and water-swellable silicon-based sealing rings. It achieves highly efficient dustproof, waterproof, and moisture-proof technical effects, greatly enhancing the protective capabilities and environmental adaptability of the device.

[0018] 3. This utility model solves the contradiction of traditional high-sealing structures having difficulty dissipating internal heat and easily causing battery overheating by cleverly integrating a ventilation component containing a waterproof membrane and micro ventilation holes into the sealed structure. It achieves the technical effect of effectively blocking water vapor while allowing internal and external air circulation to assist in heat dissipation, thus ensuring the safe operation and stable performance of the battery pack.

[0019] 4. This utility model solves the problem of misalignment between the heat spreader and the battery cell during the bonding process by setting a positioning component composed of a wedge-shaped boss and a wedge-shaped groove. It achieves the technical effect of guiding the component to be precisely aligned and ensuring the accuracy of assembly, thereby ensuring the tight bonding between the heat spreader and the battery cell and improving the heat spreader efficiency. Attached Figure Description

[0020] Figure 1 This is a perspective view of a lithium battery pack heat exchanger bonding and fixing structure proposed in this utility model; Figure 2 This is a split view of the vertical plate of a lithium battery pack heat exchanger bonding and fixing structure proposed in this utility model. Figure 3 This is an exploded view of a battery cell in a lithium battery pack heat exchanger bonding and fixing structure proposed in this utility model. Figure 4 This is an exploded view of the fixing shell of the lithium battery pack heat exchanger plate bonding and fixing structure proposed in this utility model.

[0021] Legend: 1. Vertical plate; 2. Battery cell; 3. Battery heat spreader; 4. Connecting mechanism; 401. L-shaped elastic tenon; 402. Mortise; 403. Limiting groove; 404. Fixing shell; 405. Telescopic rod; 406. Return spring; 407. Connecting plate; 408. Connecting groove; 409. Positioning component; 4091. Wedge-shaped boss; 4092. Wedge-shaped groove; 5. Sealing mechanism; 501. Sealing strip; 502. Placement groove; 503. Elastic buffer sleeve; 504. Labyrinth-type dustproof channel; 505. Glue storage tank; 506. Silicone-based sealing ring; 507. Ventilation component; 5071. Waterproof membrane; 5072. Micro vent. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Example

[0023] Please refer to Figures 1 to 4 This utility model provides a lithium battery pack heat exchanger bonding and fixing structure, which aims to solve the problems of cumbersome disassembly and assembly, insufficient connection reliability, and weak overall sealing and protection capabilities of existing lithium battery pack heat exchanger fixing methods. Figure 1 As shown, the lithium battery pack heat exchanger bonding and fixing structure mainly consists of a central assembly and upright plates 1 set on both sides of the central assembly. The central assembly consists of a battery cell 2, which serves as an energy storage unit, and battery heat exchangers 3 attached to the upper and lower sides of the battery cell 2. The battery heat exchangers 3 are used to achieve uniform heat dissipation when the battery cell 2 is working. The upright plates 1 serve as a support and fixing frame. By accommodating the central assembly in the middle, the structure of the entire lithium battery pack is supported and externally protected. The components are connected by specific connecting mechanisms 4 and sealing mechanisms 5 to form an easy-to-assemble, stable and well-protected whole.

[0024] To solve the above-mentioned technical problems, the technical solution of this embodiment is to design two connection mechanisms 4 to achieve quick snap-fit ​​between the battery cell 2 and the heat spreader plate and elastic locking between the whole and the upright plate 1, such as... Figure 1 , Figure 2 , Figure 3As shown, a connecting mechanism 4 is provided between the battery heat spreader 3 and the battery cell 2 in the central assembly. This connecting mechanism 4 includes an L-shaped elastic tenon 401 on the battery heat spreader 3 and a mortise 402 on the corresponding position of the battery cell 2 that engages with the L-shaped elastic tenon 401. The L-shaped elastic tenon 401 utilizes its own elastic deformation to automatically engage with the mortise 402 when the battery heat spreader 3 is attached to the battery cell 2, forming a longitudinal, rapid, and fixed connection. To ensure the accuracy of the connection, the battery... A positioning component 409 is also provided between the heat spreader 3 and the battery cell 2. The positioning component 409 includes a wedge-shaped boss 4091 on the battery heat spreader 3 and a wedge-shaped groove 4092 on the battery cell 2 that slides with the wedge-shaped boss 4091. The wedge-shaped boss 4091 and the wedge-shaped groove 4092 cooperate to form a guide structure, guiding the battery heat spreader 3 and the battery cell 2 to be precisely aligned and avoiding installation deviation. The connecting mechanism 4 also includes a limiting groove 403 on the inner wall of the vertical plate 1, and a limiting groove that is accommodated in the limiting groove. The elastic locking assembly within 403 includes a fixed housing 404, a telescopic rod 405, a return spring 406, and a connecting plate 407. The fixed housing 404 is fixedly connected to the inner wall of the limiting groove 403. One end of the telescopic rod 405 is fixedly connected to the fixed housing 404. The return spring 406 is sleeved on the outer side of the telescopic rod 405. The connecting plate 407 is fixedly connected to the ends of the telescopic rod 405 and the return spring 406 that are far apart. When the central assembly is placed in the space formed by the two limiting grooves 403, the connecting plates 407 on both sides are compressed, causing the telescopic rod 405 and the return spring 406 to contract. When the central assembly is in place, the connecting plates 407 are pushed out towards the central assembly under the elastic drive of the return spring 406 and can elastically and retract into the connecting groove 408 opened on the side wall of the central assembly, completing the lateral elastic locking and fixing of the central assembly. This dual connection mechanism allows the entire structure to be quickly assembled without tools, and the connection is stable and reliable.

[0025] Based on the above embodiments, the present invention may further include the following preferred technical solutions, such as... Figure 1As shown, to effectively protect the internal structure, the lithium battery pack heat exchanger plate bonding and fixing structure also includes a sealing mechanism 5. In a preferred embodiment, the sealing mechanism 5 includes a ring of mounting grooves 502 formed on the outer side of the connection between the battery heat exchanger plate 3 and the battery cell 2, and a sealing strip 501 accommodated within the mounting grooves 502. To further strengthen the sealing mechanism 5, it also includes an elastic buffer sleeve 503, which is fixedly installed on the inner side of the upright plate 1 and wraps around the left and right sides of the assembly, forming a lateral seal and buffer. Specifically, to improve dust and water resistance... To enhance the air permeability, the inner wall of the elastic buffer sleeve 503 is provided with a labyrinthine dustproof channel 504. Furthermore, to achieve adaptive enhanced sealing after contact with water, the inner wall of the elastic buffer sleeve 503 is also provided with a glue storage tank 505, in which a water-swellable silicone-based sealing ring 506 is placed. In addition, to balance high sealing performance with internal heat dissipation requirements, the elastic buffer sleeve 503 is also provided with a venting component 507, which includes a waterproof membrane 5071 covering the inner wall of the elastic buffer sleeve 503 and micro vent holes 5072 opened on the outer wall of the elastic buffer sleeve 503.

[0026] Working principle: When installing heat spreaders on the upper and lower sides of the battery cell 2 in the lithium battery pack, multiple L-shaped elastic tenons 401 are fixedly installed on adjacent sides of the heat spreaders 3 on both the upper and lower sides. The heat spreaders 3 are then attached to the battery cell 2 from both the upper and lower sides, allowing the multiple L-shaped elastic tenons 401 to engage with the mortises 402 on the upper and lower sides of the heat spreaders 3, thus completing the fixed connection between the heat spreaders 3 and the battery cell 2. During the attachment connection between the heat spreaders 3 and the battery cell 2, the guide structure formed by the wedge-shaped protrusions 4091 and wedge-shaped grooves 4092 in the positioning assembly 409 ensures the accuracy of the connection between the heat spreaders 3 and the battery cell 2. Then, the connected heat spreaders 3 and the battery cell 2 are fixed between the left and right upright plates 1. Limiting grooves 403 are opened on adjacent sides of the two upright plates 1, and multiple fixing shells 404 are fixedly connected to the inner walls of the two limiting grooves 403. The battery cell 2 is fixedly installed in the fixing shells 404. The device includes a telescopic rod 405 and a return spring 406. Connecting plates 407 are fixedly connected to the opposite sides of the telescopic rod 405 and return spring 406 on both sides. After the structure consisting of the battery heat spreader 3 and the battery cell 2 is placed into the space formed by the two limiting slots 403, the connecting plates 407, return spring 406, and telescopic rod 405 are compressed and retract. After all components are in place, the connecting plates 407, driven by the return spring 406, are pressed towards the structure consisting of the battery heat spreader 3 and the battery cell 2, allowing the connecting plates 407 to fit into the multiple connecting slots 408 on the left and right sides of the battery heat spreader 3 and the battery cell 2. This fixes the structure of the battery heat spreader 3 and the battery cell 2, preventing loosening of the bonded connection. Compared to traditional adhesive bonding and bolt connections, the coordinated operation of the components of the connecting mechanism 4 extends the device's service life, reduces the need for disassembly tools, and improves connection efficiency. Furthermore, after connecting the battery heat spreader 3, the battery cell 2, and the upright plate 1, a ring of mounting grooves 502 is opened on the outer side of the connection between the battery heat spreader 3 and the battery cell 2. Then, sealing strips 501 are placed in the upper and lower mounting grooves 502 to prevent impurities from entering from the connection. Elastic buffer sleeves 503 are fixedly installed on the adjacent sides of the two upright plates 1, so that the elastic buffer sleeves 503 can wrap the left and right sides of the structure composed of the battery heat spreader 3 and the battery cell 2 to prevent impurities from entering from the connection gap between the structure composed of the battery heat spreader 3 and the battery cell 2 and the upright plate 1. At the same time, a glue storage groove 505 is opened on the inner wall of the elastic buffer sleeve 503, and a water-swellable silicon-based sealant is placed on the inner wall of the glue storage groove 505. A sealing ring 506 is used, and a labyrinthine dustproof channel 504 is opened in the middle of the inner wall of the elastic buffer sleeve 503 to extend the path of water vapor and dust intrusion, thereby blocking the entry of impurities. To prevent overheating inside the combined structure, a waterproof membrane 5071 is installed on the inner wall of the elastic buffer sleeve 503, and multiple micro vent holes 5072 are opened on the outer wall of the elastic buffer sleeve 503. By using the two components of the ventilation component 507, air can circulate inside and outside the structure while blocking water vapor. This allows the device to complete the sealing of the attached and fixed structure through the various components of the sealing mechanism 5, improving the device's protection capability and environmental adaptability, and preventing the medium inside the battery heat spreader 3 and the battery cell 2 from being contaminated.

Claims

1. A structure for bonding and fixing a heat spreader plate to a lithium battery pack, comprising: Battery cell (2); A battery heat spreader (3) is disposed on the upper and lower sides of the battery cell (2); And the upright plate (1) is clamped on the left and right sides of the assembly consisting of the battery cell (2) and the battery heat dissipation plate (3); The feature is that a connecting mechanism (4) is provided between the battery heat dissipation plate (3) and the battery cell (2). The connecting mechanism (4) includes an L-shaped elastic tenon (401) provided on the battery heat dissipation plate (3) and a mortise (402) provided on the battery cell (2) to engage with the L-shaped elastic tenon (401). The connecting mechanism (4) also includes a limiting groove (403) provided on the inner wall of the upright plate (1) and an elastic locking component housed in the limiting groove (403). The elastic locking component includes a fixed shell (404), a telescopic rod (405), a return spring (406) and a connecting plate (407). The connecting plate (407) is driven by the return spring (406) and can elastically extend and retract into the connecting groove (408) opened on the side wall of the assembly.

2. The lithium battery pack heat exchanger bonding and fixing structure according to claim 1, characterized in that, A positioning component (409) is also provided between the battery heat dissipation plate (3) and the battery cell (2). The positioning component (409) includes a wedge-shaped boss (4091) provided on the battery heat dissipation plate (3) and a wedge-shaped groove (4092) provided on the battery cell (2) and slidingly engaging with the wedge-shaped boss (4091).

3. The lithium battery pack heat exchanger bonding and fixing structure according to claim 1, characterized in that, It also includes a sealing mechanism (5), which includes a sealing strip (501) disposed on the outside of the connection between the battery heat spreader (3) and the battery cell (2).

4. The lithium battery pack heat exchanger bonding and fixing structure according to claim 3, characterized in that, A mounting groove (502) is provided on the outer side of the connection between the battery heat dissipation plate (3) and the battery cell (2), and the sealing strip (501) is accommodated in the mounting groove (502).

5. The lithium battery pack heat exchanger bonding and fixing structure according to claim 3, characterized in that, The sealing mechanism (5) also includes an elastic buffer sleeve (503), which is fixedly installed on the inner side of the upright plate (1) and wraps around the left and right sides of the assembly.

6. The lithium battery pack heat exchanger bonding and fixing structure according to claim 5, characterized in that, The inner wall of the elastic buffer sleeve (503) is provided with a maze-like dustproof channel (504).

7. The lithium battery pack heat exchanger bonding and fixing structure according to claim 5, characterized in that, The inner wall of the elastic buffer sleeve (503) is also provided with a glue storage groove (505), and a water-swellable silicone-based sealing ring (506) is placed in the glue storage groove (505).

8. The lithium battery pack heat exchanger bonding and fixing structure according to claim 5, characterized in that, The elastic buffer sleeve (503) is also provided with a ventilation component (507), which includes a waterproof membrane (5071) covering the inner wall of the elastic buffer sleeve (503) and a micro ventilation hole (5072) opened on the outer wall of the elastic buffer sleeve (503).

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