Battery cell module with buffer structure

Abstract

The utility model belongs to the field of battery cell modules, and particularly relates to a battery cell module with a buffer structure. The battery cell module comprises battery cells, a buffer mechanism is arranged between every two adjacent battery cells, the buffer mechanism mainly comprises a frame body, a buffer pad and a buffer assembly, the frame body is made of a deformable material, and the two ends of the frame body are connected with the side faces of the battery cells; the cushion pads are respectively attached to the side parts of the battery cells, and cavities for heat dissipation are formed between the cushion pads and the frame body; the buffering assemblies are arranged in the cavity at equal intervals, and at least one side face of each buffering assembly is stably connected with the buffering cushion. When the battery cell expands and deforms due to charging and discharging, the buffer pads on the two sides move inwards to compress the inner cavities of the buffer pads, air in the cavities between the frame body and the buffer pads serves as a first defense line, and collision energy is preliminarily absorbed and dispersed. And the buffer assembly in the cavity is used for carrying out secondary buffering, so that the residual impact energy is further absorbed, dual protection on the battery cell is realized, and the buffer effect is remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery cell modules, specifically relating to a battery cell module with a buffer structure. Background Technology

[0002] With the increasing depletion of traditional energy sources and the growing environmental awareness of the public, new energy vehicles, especially electric vehicles powered by rechargeable batteries, are receiving increasing attention from the market. As the power source for vehicles, battery modules, due to space constraints and considerations for cell reliability, employ a design where multiple cells are connected side-by-side. Typically, aerogel heat insulation pads are installed between the cells in a power battery pack to prevent thermal runaway. However, these heat insulation pads cannot buffer or absorb cell tolerances, and after long-term use, individual cells may expand and deform, causing compression and collisions between them.

[0003] Currently, foam is typically used as a buffer material between multiple individual battery cells to cushion the collisions between them or absorb the tolerances caused by the expansion of the individual cells during charging and discharging. However, traditional foam technology has the following drawbacks: on the one hand, the compression and expansion range of foam are limited, which limits its application and makes it unsuitable for individual battery cells that generate large expansion forces; on the other hand, the texture of foam is relatively soft, making it unsuitable for pre-tightening individual battery cells that generate large expansion forces.

[0004] In summary, the solution to the tolerance issues arising from the mutual collisions between individual battery cells and the expansion caused by the charging and discharging of individual battery cells has become an urgent problem to be solved.

[0005] A buffer assembly and battery module are disclosed in patent number CN217485612U. This buffer assembly is used for buffering between individual battery cells, with at least one side of the buffer assembly abutting against the individual battery cells. The buffer assembly mainly includes a first side plate, a second side plate, and an elastic element. The first and second side plates are arranged opposite each other, with one of the first or second side plates having a protruding positioning post, and the other of the second or first side plate having a positioning hole through which the positioning post can pass. The elastic element is arranged around the positioning post. The buffer assembly in this prior art can buffer the expansion force between individual battery cells, preventing squeezing and collision between adjacent battery cells, thereby improving the safety performance of the battery module. However, because it only uses an elastic element for simple buffering, it has shortcomings such as low buffering force, large space occupation, and affecting heat dissipation between battery cells.

[0006] The information disclosed in the background section above is only used to enhance the understanding of the background art of the art described herein. Therefore, the background art may contain certain information that would not be considered part of the prior art by those skilled in the art. Utility Model Content

[0007] To address the shortcomings of the existing technology, this invention proposes a battery cell module with a buffer structure.

[0008] The technical solution adopted in this utility model is as follows:

[0009] A battery cell module with a buffer structure includes battery cells, and a buffer mechanism is disposed between two adjacent battery cells, characterized in that the buffer mechanism includes:

[0010] The frame is a deformable material structural component, with its two ends connected to the sides of the battery cell.

[0011] Buffer pads are attached to the sides of the battery cells, and a cavity for heat dissipation is formed between the buffer pads and the frame.

[0012] A buffer assembly is arranged at equal intervals inside the cavity, and at least one side of the buffer assembly is fixedly connected to the buffer pad.

[0013] In an optional technical solution, the buffer assembly includes: triangular block I and triangular block II, with their inclined surfaces in contact. A housing is also fixed on one of the buffer pads, and a piston plate is slidably connected inside the housing. One side of the piston plate is connected to triangular block I via a connecting rod, and a compression spring is fixedly connected to the side of the piston plate away from triangular block I. The other end of the compression spring is fixedly connected to the inner wall of the housing. Triangular block II is fixedly installed on the other buffer pad away from triangular block I.

[0014] In an optional technical solution, a heat insulation pad is also provided between the buffer pad and the side of the battery cell.

[0015] Furthermore, heat dissipation fins are embedded at the bottom of the cavity, and the side of the heat dissipation fins away from the frame is in contact with the cooling pipes inside the module.

[0016] In an optional technical solution, the frame is made of rubber or foam material.

[0017] In an optional technical solution, the frame is connected to the heat insulation pad by adhesive bonding.

[0018] In optional technical solutions, the heat insulation pad is made of rigid plastic or metal.

[0019] In an optional technical solution, the buffer pad is made of rubber or natural rubber structural components.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0021] 1) When the battery cell expands and deforms, it causes the two heat insulation pads to move inward. This inward movement of the heat insulation pads causes the frame to deform under stress and the two buffer pads to move inward as well. The air in the cavities of the two buffer pads can provide a certain degree of cushioning. Furthermore, during the inward movement of the two buffer pads, triangular block II will compress triangular block I towards the shell. The movement of triangular block I towards the shell will cause the piston plate to slide inward towards the battery cell and compress the spring and the air inside the shell. Under the combined force of the air and the compressed spring, the deformation force of the battery cell can be buffered a second time. Through the combination of the combined force of the compressed spring and the air, not only can the mutual collision between individual battery cells be buffered and the tolerances caused by the expansion of individual battery cells during charging and discharging be absorbed, but the buffering effect can also be significantly improved, reducing the degree of battery cell deformation.

[0022] 2) During the compression and buffering process, by converting the lateral compression force into the longitudinal buffering force, the overall space occupied can be effectively reduced, ensuring the placement effect of the battery cell.

[0023] 3) During the use of the battery cell, the heat insulation pad can transfer the heat generated by the battery cell to the interior of the cavity, and the heat dissipation fins can efficiently exchange the hot air in the cavity with the cold air on the heat dissipation pipe, thereby achieving heat dissipation of the battery cell. Through the cooperation between the heat insulation pad, the cavity and the heat dissipation fins, the battery cell can be efficiently cooled. Attached Figure Description

[0024] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of the battery cell module in this utility model;

[0026] Figure 2 This is a schematic diagram of the buffer mechanism in this utility model;

[0027] Figure 3 for Figure 1 A schematic cross-sectional view of the buffer mechanism;

[0028] Figure 4 This is a schematic diagram of the buffer assembly in this utility model;

[0029] Figure 5 This is a schematic diagram of the connection structure between the shell and the triangular block I in this utility model. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application 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 application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] Example 1

[0032] This embodiment provides an innovative cell module design scheme, which specifically introduces a high-efficiency buffer structure to enhance the protection performance of the cell 1 inside the module. See reference. Figure 1 , 2 ,include:.

[0033] In the battery cell 1, a buffer mechanism is provided between two adjacent battery cells 1. In this case, the two sides of the buffer mechanism abut against the two individual battery cells 1. In another deployment scenario, when the buffer structure is placed between the individual battery cell 1 and the module housing 8 (not shown in the figure), one side of the buffer assembly abuts against the individual battery cell 1. The buffer mechanism absorbs the mutual collisions between individual battery cells 1 and the tolerances caused by the expansion of individual battery cells 1 during charging and discharging, and can significantly improve the buffering effect and reduce the degree of deformation of battery cells 1.

[0034] The core components of a buffer mechanism consist of three main parts:

[0035] The frame 2, made of a deformable material, is connected to the sides of the battery cell 1 at both ends, ensuring the stability and flexibility of the structure. The frame 2 is preferably made of highly elastic materials such as rubber or foam. These materials not only deform under stress to absorb energy but also have good recovery properties, extending their service life.

[0036] The buffer pads 4 are respectively attached to the side of the battery cell 1. A cavity for heat dissipation is formed between the buffer pads 4 and the frame 2. This design not only enhances the buffering performance, but also takes into account the thermal management requirements during the operation of the module, ensuring that the battery cell 1 operates within a suitable temperature range.

[0037] The buffer components are deployed at equal intervals inside the cavity, with at least one side of each component securely connected to the buffer pad 4. The layout of the buffer components—two rows and four columns in this example—is designed to maximize space utilization and provide a balanced and efficient buffering effect. Of course, this layout can be flexibly adjusted, such as to three rows and five columns, depending on the actual application scenario and the specifications of cell 1, to adapt to diverse needs.

[0038] Based on the above design, when the battery cell 1 expands and deforms due to charging and discharging, this buffering mechanism is immediately activated: the expansion of the battery cell 1 first pushes the buffer pads 4 on both sides inward, which in turn causes the frame 2 to deform. The air in the cavity between the frame 2 and the buffer pads 4 acts as the first line of defense, initially absorbing and dispersing the collision energy. Then, the buffer component inside the cavity acts as the second buffer barrier, using its unique elasticity and structural strength to further absorb the residual impact energy, achieving dual protection for the battery cell 1. This dual buffering strategy, combining air and solid buffer components, significantly improves buffering efficiency and effectively reduces the risk of deformation of the battery cell 1 caused by external forces or internal stress.

[0039] In this embodiment, the frame 2 is connected to the heat insulation pad 3 by adhesive bonding. Of course, operators can also use other connection methods, such as welding, etc., and this embodiment does not limit this.

[0040] In this embodiment, the buffer pad 4 is made of EVA material, foam material, shock-absorbing adhesive, and rubber or natural rubber structural components. The specific material selected by the operator depends on the actual application scenario and requirements.

[0041] Example 2

[0042] This embodiment further provides a preferred implementation of the buffer component, see reference. Figure 3 , 4 5. This includes triangular block I6 and triangular block II7, which form the core structure of the buffer assembly. They contact each other with inclined planes, creating a unique force transmission path. Of particular note is that a housing 8 is cleverly fixedly mounted on one of the buffer pads 4. Inside this housing 8 is a slidingly connected piston plate 10. One side of the piston plate 10 is tightly connected to triangular block I6 via a connecting rod 9, while the other side is fixedly connected to a compression spring 11. The other end of the compression spring 11 is securely welded or bonded to the inner wall of the housing 8. Meanwhile, triangular block II7 is firmly mounted on another buffer pad 4, away from triangular block I6.

[0043] Based on the above design, when the battery cell 1 expands and deforms during the charging and discharging process, this chain reaction is immediately initiated. The expansion of the battery cell 1 first pushes the buffer pads 4 on both sides to move inward. This action not only causes the frame 2 to deform under force, but also causes the two buffer pads 4 to move towards each other. In this process, the triangular block II 7, with its inclined surface as the contact point, begins to apply pressure to the triangular block I 6, pushing it to move towards the housing 8. As the triangular block I 6 moves, the piston plate 10 connected to it also slides and penetrates deeper into the battery cell module. This action not only compresses the compression spring 11, but also greatly reduces the air volume inside the housing 8.

[0044] In this meticulously designed buffering mechanism, the reaction force generated by the compression of air and the elastic force of the compression spring 11 together constitute a secondary buffer against the deformation force of the battery cell 1. This dual buffering strategy not only significantly improves the buffering effect but also effectively disperses the stress generated when the battery cell 1 expands, reducing the risk of deformation. More ingeniously, by cleverly transforming the compressive force that might otherwise cause large lateral displacement into a longitudinal buffering force, this design greatly saves space, ensuring the compactness and efficiency of the internal structure of the battery cell module.

[0045] Example 3

[0046] Based on Examples 1 and 2, an innovative heat dissipation design is further introduced to improve the thermal management capability of the battery cell module under high load operation, ensuring the safety and stable performance of battery cell 1.

[0047] The core of this embodiment lies in, see reference Figure 1 , 2 A heat insulation pad 3 is cleverly added between the buffer pad 4 and the side of the battery cell 1. This design is not arbitrary, but based on a deep understanding of the thermal management requirements of the battery cell module. The heat insulation pad 3 is made of high-performance materials such as rigid plastics or metals. These materials are not only hard enough to effectively support the structure between the battery cell 1 and the buffer pad 4, but more importantly, they have excellent flame retardant and heat insulation properties. Compared with traditional foam materials, rigid plastics such as phenolic plastics, polyurethane plastics, and epoxy plastics, and metal materials such as aluminum alloys and copper alloys, can more effectively block heat transfer in the event of thermal runaway, preventing heat from spreading rapidly inside the battery cell module, thereby significantly improving the safety performance of the individual battery cell 1.

[0048] Furthermore, this embodiment cleverly utilizes a cavity structure with heat dissipation fins 5 embedded at its bottom. These heat dissipation fins 5 act like miniature heat exchangers, with one side tightly attached to the cavity and the other side in close contact with the cooling pipes inside the module. When the battery cell 1 generates heat during charging and discharging, the heat insulation pad 3 first guides the heat into the cavity. Subsequently, the heat dissipation fins 5 utilize their highly efficient heat conduction characteristics to quickly and thoroughly exchange the hot air inside the cavity with the cold air on the cooling pipes. This process not only effectively reduces the temperature of the battery cell 1 but also ensures the stability and reliability of the battery cell module under long-term, high-load operation.

[0049] It is worth mentioning that the synergistic effect between the heat insulation pad 3, the cavity, and the heat dissipation fins 5 constitutes a complete heat dissipation system. Each component performs its specific function while remaining closely connected, collectively providing an efficient and reliable heat dissipation solution for the battery cell module. This innovative design not only enhances the thermal management capabilities of the battery cell module but also provides new ideas and directions for the design of battery cell modules in fields such as electric vehicles and energy storage systems.

[0050] In summary, Example 3, through the innovative design of introducing the heat insulation pad 3 and heat dissipation fins 5, significantly enhances the thermal management performance of the battery cell module, providing a strong guarantee for the safe and stable operation of battery cell 1. This design not only reflects a profound understanding of the thermal management requirements of the battery cell module, but also injects new vitality and possibilities into the continued development of electric vehicles, energy storage systems, and other fields.

[0051] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell module with a buffer structure, comprising battery cells (1), a buffer mechanism is arranged between two adjacent battery cells (1), characterized in that, The buffer mechanism comprises: A frame body (2) made of deformable material, the two ends of which are connected to the side of the battery cell (1) respectively; A buffer pad (4) attached to the side of the battery cell (1) respectively, and a cavity for heat dissipation is formed between the buffer pad (4) and the frame body (2); A buffer assembly is arranged inside the cavity at equal intervals, and at least one side of the buffer assembly is fixedly connected to the buffer pad (4).

2. The battery cell module with a buffer structure according to claim 1, wherein, The buffer assembly comprises triangular blocks I (6) and II (7), the inclined surfaces of which are in contact, one of the buffer pads (4) is further fixedly provided with a shell (8), a piston plate (10) is slidably connected inside the shell (8), one side of the piston plate (10) is connected to the triangular block I (6) through a connecting rod (9), the side of the piston plate (10) away from the triangular block I (6) is fixedly connected to a compression spring (11), the other end of the compression spring (11) is fixedly connected to the inner wall of the shell (8), and the triangular block II (7) is fixedly installed on the other buffer pad (4) away from the triangular block I (6).

3. The battery cell module with a buffer structure according to claim 1, wherein, A heat insulation pad (3) is further arranged between the buffer pad (4) and the side of the battery cell (1).

4. The battery cell module with a buffer structure according to claim 3, wherein, Heat dissipation fins (5) are embedded at the bottom of the cavity, and the side of the heat dissipation fins (5) away from the frame body (2) is in contact with the refrigeration pipeline in the module.

5. The battery cell module with a buffer structure according to claim 4, wherein, The frame body (2) is made of rubber or foam material.

6. The battery cell module with a buffer structure according to claim 5, wherein, The frame body (2) is connected to the heat insulation pad (3) by adhesion.

7. The battery cell module with a buffer structure according to claim 3, wherein, The heat insulation pad (3) is made of hard plastic or metal material.

8. The battery cell module with a buffer structure according to claim 1, wherein, The buffer pad (4) is made of rubber or natural rubber.

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