Battery thermal insulation structure, single battery and battery pack

Abstract

This application discloses a battery heat insulation structure, a single cell, and a battery pack. The battery heat insulation structure includes a heat insulation pad and a buffer frame. The heat insulation pad is disposed on the side of the single cell. The buffer frame is fixedly disposed on the heat insulation pad. The buffer frame is a closed frame structure, and the distance between the outer edge of one side of the buffer frame and the edge of the nearest heat insulation pad is 0-20mm. The area of ​​the buffer frame on the heat insulation pad accounts for 5%-50%. This disclosure provides a closed frame structure buffer frame on the heat insulation pad to fill the gaps between adjacent single cells in the arrangement direction. At the same time, the closed buffer frame can enclose and form a protective area to prevent adhesive from entering the protective area, while reserving expansion space for the battery during operation, thereby improving the stability and safety of the battery during operation.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery heat insulation structure, a single cell, and a battery pack. Background Technology

[0002] In a battery pack composed of multiple stacked individual cells, heat insulation pads need to be placed between the adjacent sides of the individual cells (especially for the case of large side arrangement of cells) to reduce the mutual influence of individual cells during operation. The size of the heat insulation pads should be close to but smaller than the size of the large surface area to avoid the heat insulation pads protruding circumferentially on the large surface area and affecting the stacking effect of the individual cells. However, in battery design projects, the thickness of the heat insulation pad is often determined based on simulation analysis, which differs from the gap requirements of individual cells in the project. When the gap requirement of the individual cells is greater than the thickness requirement of the heat insulation pad, a strip-shaped buffer pad is pasted on the surface of the heat insulation pad. Similarly, based on stacking requirements and negative assembly tolerance requirements, the length of the buffer pad set on the heat insulation pad will be shorter than the heat insulation pad. The above structure will result in a structure in which the length of the large surface of the individual cell decreases stepwise along its length after the battery pack is assembled, forming a multi-level gap structure. After applying adhesive to the bottom of the battery pack, there is a risk that the adhesive may penetrate into the large surface of the battery along the gaps. When there is solidified structural adhesive in some areas of the large surface of the battery, uneven stress will occur in different areas of the large surface after the battery cycles expand, leading to lithium plating problems or even the risk of large surface cracking, affecting the service life of the battery pack.

[0003] Therefore, how to reduce the risk of large-area glue overflow in individual cells of the battery pack and improve the operational stability of the battery pack is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery heat insulation structure, a single cell, and a battery pack to reduce the risk of large-area glue overflow in the single cell of the battery pack and improve the operational stability of the battery pack.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A battery thermal insulation structure, comprising:

[0007] A heat insulation pad is installed on the side of the individual battery cell;

[0008] The buffer frame is fixedly installed on the heat insulation pad. The buffer frame is a closed frame structure, and the distance between the outer edge of one side of the buffer frame and the edge of the nearest heat insulation pad is 0-20mm. The area of ​​the buffer frame on the heat insulation pad is 5%-50%.

[0009] As can be seen from the above technical solution, one aspect of this disclosure provides a battery heat insulation structure, which mainly includes a heat insulation pad and a buffer frame. The heat insulation pad is disposed on the side area of ​​the single cell, positioned between two single cells to reduce the mutual influence between the two single cells during operation. Simultaneously, a buffer frame is fixedly disposed on the heat insulation pad. The buffer frame is made of an elastic material with a certain deformation capacity in the thickness direction. The gap between adjacent single cells is filled by the heat insulation pad and the buffer frame to maintain the structural stability of the single cells within the battery pack. Furthermore, the buffer frame is a closed frame structure to enclose a protective area in the middle. During the adhesive application process at the bottom of the battery pack, the adhesive seeps into the gap between the side wall of the single cell and the heat insulation pad, but is blocked by the buffer frame. The closed structure of the buffer frame prevents the adhesive from entering the protected area. By setting the installation position of the buffer frame, areas of the single cell that expand significantly during cyclic use are located within the protected area, thus avoiding the problem of space occupation or stress concentration caused by adhesive solidification and the expansion of the single cell, thereby improving the service life of the battery pack. In addition, the distance between the outer edge of one side of the buffer frame and the edge of the nearest heat insulation pad is 0-20mm, so as to ensure that the protective area formed by the buffer frame has sufficient area and can fit with the edge of the heat insulation pad or maintain a certain distance, so as to avoid the buffer frame protruding from the heat insulation pad and affecting the assembly of the battery heat insulation structure. At the same time, the area of ​​the buffer frame on the heat insulation pad is 5%-50%, so that the buffer frame does not excessively occupy the area on the heat insulation pad, leaving enough space for the expansion of the individual battery, and maintaining its buffering effect with a certain area ratio. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A schematic diagram of the assembly structure of the battery heat insulation structure between individual cells provided in an embodiment of the present invention;

[0012] Figure 2 This is a front view of a battery heat insulation structure provided in an embodiment of the present invention;

[0013] Figure 3 A schematic diagram of a splicing structure buffer frame provided in an embodiment of this utility model;

[0014] Figure 4 A schematic diagram of a buffer frame with a splicing structure provided in another embodiment of this utility model;

[0015] Figure 5 A schematic diagram of a buffer frame with a connecting groove provided in an embodiment of the present utility model;

[0016] Figure 6 A schematic diagram of a buffer frame with stepped connecting grooves provided in an embodiment of the present utility model;

[0017] Figure 7 This is a schematic diagram of a buffer frame with toothed connecting grooves provided in an embodiment of the present invention;

[0018] Figure 8 This is a schematic diagram of a buffer frame with an arc-shaped connecting groove provided in an embodiment of the present invention.

[0019] in:

[0020] 10 - Single cell; 20 - Heat insulation pad; 30 - Buffer frame; 310 - First side; 320 - Second side; 330 - Connecting slot. Detailed Implementation

[0021] The core of this application is to disclose a battery heat insulation structure, a single cell, and a battery pack, so as to reduce the risk of large-area glue overflow in the single cell of the battery pack and improve the operational stability of the battery pack.

[0022] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0023] like Figure 1 As shown, one aspect of this disclosure provides a battery heat insulation structure for use between two adjacent single cells 10 and fixedly connected to the side of at least one single cell 10 to fill the gap between the single cells 10, maintain the stable setting of the single cells 10, improve the heat insulation performance of the single cells 10, and reduce the mutual influence of adjacent single cells 10 during operation.

[0024] Specifically, the battery heat insulation structure mainly includes a heat insulation pad 20 and a buffer frame 30. The heat insulation pad 20 is disposed on one side of the single battery 10, and the heat insulation pad 20 is mostly made of materials with high thermal resistance and low thermal conductivity, such as heat-resistant materials such as glass fiber, ceramic fiber or polyimide. However, due to the poor elasticity of the material of the heat insulation pad 20, if it is designed with a positive tolerance according to the preset thickness, there will be a problem of not being able to assemble due to the assembly error of the two single batteries 10. If a negative tolerance is designed, the gap between the single batteries 10 will not be completely filled, which will make the single battery 10 shaky. Therefore, in this embodiment, a buffer pad is also fixedly disposed on the heat insulation pad 20. The buffer pad is made of elastic material and is disposed in the thickness direction of the heat insulation pad 20. Through its elasticity, it can adapt to the gap between the single batteries 10 and fill the gap, providing additional mechanical protection for the single battery 10 and preventing the single battery 10 from being damaged when subjected to external impact.

[0025] Based on the above structure, to prevent the adhesive from gradually seeping into the sides of the battery along the bottom of the individual battery 10, the heat insulation pad 20, and the buffer frame 30 after the adhesive is applied to the bottom of the battery pack, causing stress concentration on the sides of the battery after solidification and abnormal expansion during battery expansion, in this embodiment, the buffer frame 30 is a closed frame structure to enclose and form a protective area in the middle. When the battery heat insulation structure is placed between two individual batteries 10, the buffer frame 30 will be subjected to the pressing force from both sides, maintaining the sealed structure of the middle protective area. Thus, during the process of applying adhesive to the bottom of the battery pack, after the adhesive seeps into the gap between the side wall of the individual battery 10 and the heat insulation pad 20, it will be blocked by the compressed buffer frame 30, preventing the adhesive from entering the protective area. By adjusting the setting position of the buffer frame 30, the area of ​​the individual battery 10 with a large expansion during cycle use is located in the protective area, thus avoiding the problem of space occupation or stress concentration caused by the solidification of adhesive on the expansion of the individual battery 10, and improving the service life of the battery pack.

[0026] It should be noted that the buffer frame 30 is made of one or a combination of two or more of the following materials: silicone, microporous foamed polypropylene, and polyurethane foam.

[0027] Furthermore, in the battery heat insulation structure provided in this embodiment, the buffer frame 30 is preferably a closed frame structure with a similar structure to the outer edge of the heat insulation pad 20. That is, the buffer frame 30 can be obtained by scaling the outer edge of the heat insulation pad 20 to make the position of the buffer frame 30 on the heat insulation pad 20 more uniform. At the same time, the distance between the outer edge of one side of the buffer frame 30 and the nearest edge of the heat insulation pad 20 is 0-20mm to meet the needs of buffering and internal protection. Specifically, the maximum distance between the edge of the buffer frame 30 and the edge of the heat insulation pad 20 is 0. At this time, the frame area of ​​the buffer frame 30 is large. During the glue application process at the bottom of the battery pack, since the buffer frame 30 is close to the edge of the heat insulation pad 20, a large amount of glue will come into contact. The edges of the buffer frame 30 pose a certain risk of leakage. While the assembly process requires relatively small errors, greater assembly precision is necessary. Therefore, it is preferable to set a certain distance between the edges of the buffer frame 30 and the heat insulation pad 20 to allow sufficient assembly tolerance and prevent the buffer frame 30 from exceeding the heat insulation pad 20 and affecting the sealing effect. However, if the distance between the edges of the buffer frame 30 and the heat insulation pad 20 is too large, the closed frame structure of the buffer frame 30 will have a smaller area for a given area of ​​the heat insulation pad 20. This results in a smaller protected area, which, while reducing the risk of adhesive entering the protected area, provides less expansion space for the individual battery 10, potentially shortening its lifespan due to insufficient expansion area during operation. Therefore, the distance between the outer edge of one side of the buffer frame 30 and the nearest edge of the heat insulation pad 20 needs to be between 0-20mm to balance its adhesive blocking effect with the required area of ​​the protected area.

[0028] Furthermore, in the battery heat insulation structure provided in this embodiment, the area ratio of the buffer frame 30 on the heat insulation pad 20 is 5%-50%. Similarly, when the area ratio of the buffer frame 30 on the heat insulation pad 20 is less than 5%, the setting range of the buffer frame 30 is small, and its frame structure will also be thinner. This will not only weaken the buffering effect of the buffer frame 30, but also make it easier for adhesive to penetrate into the protective area formed by the buffer frame 30. However, when the area ratio of the buffer frame 30 on the heat insulation pad 20 exceeds 50%, the buffer frame 30 will occupy too much space, causing the expansion space of the single battery 10 to be compressed, thus failing to achieve the purpose of extending the battery pack life.

[0029] The battery heat insulation structure provided in this disclosure, through the combined design of heat insulation pad 20 and buffer frame 30, can effectively block heat transfer during the stacking of multiple individual batteries 10, while providing reliable buffer protection for the individual batteries 10. Furthermore, through the structural design of the buffer frame 30, it prevents adhesive from intruding into the side area from the bottom of the individual battery 10, reduces the risk of lithium plating during the operation of the individual battery 10, and limits the expansion area of ​​the individual battery 10, thereby improving the operational stability and service life of the battery pack.

[0030] Furthermore, in the battery heat insulation structure provided in the embodiments of this disclosure, such as Figure 2 As shown, the buffer frame 30 can be a one-piece structure, integrally molded and fixed to the heat insulation pad 20 by adhesive. The connection process requires only a single operation. Furthermore, the buffer frame 30 can be configured as a rectangular, diamond-shaped, or elliptical frame structure to ensure the integrity of its enclosed area. It should be noted that the one-piece buffer frame 30 has no connection gaps, which better blocks adhesive. At the same time, the fewer components reduce the number of parts in the battery pack bill of materials, thereby reducing material accounting and storage costs.

[0031] In other embodiments of this disclosure, such as Figure 3 and Figure 4 As shown, the buffer frame 30 can also be configured as a split structure and spliced ​​together to form a frame structure. Unlike the integrated structure, the split buffer frame 30 can be glued separately, allowing for some adjustment during the fixing process. This avoids the assembly problem of difficulty in fully aligning the integrated structure and improves the assembly accuracy of the buffer frame 30. Specifically, in a specific embodiment of this disclosure, the buffer frame 30 is a rectangular frame structure. The spliced ​​buffer frame 30 includes a pair of first sides 310 and a pair of second sides 320. It should be noted that the first sides 310 and the second sides 320 are arranged in parallel to form a rectangular structure. First, the splicing structure makes the manufacturing and assembly of the buffer frame 30 more flexible. It can select appropriate lengths of the first sides 310 and the second sides 320 for splicing according to the size and shape of the individual battery 10 and the heat insulation pad 20, thereby realizing a customized buffer frame 30 design. Furthermore, it can shorten the length of the first sides 310 and the second sides 320 through convenient cutting operations under actual working conditions, effectively improving the versatility and applicability of the buffer frame 30.

[0032] Secondly, the spliced ​​structure of the buffer frame 30 can be connected sequentially according to the extension order of the four sides during installation, which is easy to operate and also convenient for maintenance and replacement. If a part of the buffer frame 30 is damaged during use, only the damaged first side 310 or the second side 320 needs to be replaced, without replacing the entire buffer frame 30, which reduces maintenance costs to a certain extent.

[0033] Considering that the spliced ​​structure of the buffer frame 30 has a butt joint gap on the first side 310 and the second side 320, there is a risk that glue may enter the protected area inside the buffer frame 30. Therefore, in some embodiments of this disclosure, the first side 310 and the second side 320 of the buffer frame 30 are locally modified or made of composite materials.

[0034] Specifically, such as Figure 3As shown, in some embodiments, the first side 310 is arranged along the length of the heat insulation pad 20, while the second side 320 abuts against one of the first sides 310 at each of its two ends along its length. That is, the first side 310 and the second side 320 form a rectangular frame through a planar butt joint. For a pair of first sides 310 and second sides 320, the butt joint gap exists at the end position of the second side 320 along its length. Furthermore, the compression ratio of the two side regions of the second side 320 along its length is greater than that of the middle region, so that under the same pressure, the two side regions of the second side 320 are more prone to deformation than the middle region. It should be noted that for a single second side 320, the difference in compression ratio between different regions can be achieved through local modification. Similarly, during the production process of the second side 320, different materials can be used for molding in the middle and on the sides to meet the requirements for different compression ratios in different regions. Furthermore, when the buffer frame 30 is pressed by the individual battery cells 10 on both sides, the two sides of the second side 320 will undergo relatively large deformation, and there will be a tendency to elongate the second side 320 at both ends. Since the joint gap between the first side 310 and the second side 320 is located at the end of the length direction of the second side 320, the relatively large compression deformation of the two sides of the second side 320 can fully fill the joint gap, thus maintaining the tightness of the joint between the first side 310 and the second side 320 and reducing the risk of glue intruding into the protective area formed by the buffer frame 30 from the joint position of the first side 310 and the second side 320.

[0035] In other embodiments of this disclosure, such as Figure 4 As shown, the second side 320 of the buffer frame 30 is arranged along the width direction of the heat insulation pad 20. Meanwhile, the two ends of the first side 310 in the length direction abut against a second side 320. Unlike the previous embodiment, in this embodiment, for a pair of first sides 310 and second sides 320, the mating gap exists at the end position of the first side 310 in the length direction. Based on this, the compression ratio of the two side regions of the first side 310 in the length direction is greater than that of the middle region, so that under the same pressure, the two side regions of the first side 310 are more prone to deformation than the middle region. Similar to the previous embodiment, when the buffer frame 30 is pressed by the two individual batteries 10, the two side regions of a single first side 310 will undergo relatively large deformation and tend to extend the first side 310 at both ends, thereby achieving sufficient filling of the mating gap between the first side 310 and the second side 320, thus maintaining a tight enclosure and protective effect of the buffer frame 30.

[0036] Furthermore, in the buffer frame 30 provided in the aforementioned embodiments, both the first side 310 and the second side 320 are sealed by a single-plane butt joint, which has low manufacturing difficulty and is easy to assemble and connect. However, the butt joint gap is a weak area and is prone to glue leakage. In other embodiments of this disclosure, such as Figure 5 As shown, one or both of the first side 310 and the second side 320 are provided with connecting grooves 330 to increase the docking length and contact area at the docking position and reduce the risk of leakage at the docking position. Specifically, when one of the first side 310 and the second side 320 is provided with a connecting groove 330, the ungrooved side structure engages with the connecting groove 330 through its end. The partially embedded structure allows the docking seam to bend in the area where the connecting groove 330 is located, making it more difficult for adhesive to penetrate. When both the first side 310 and the second side 320 are provided with connecting grooves 330, the first side 310 and the second side 320 dock through the connecting grooves 330. The connecting groove 330 can be designed with a more complex structure to prevent adhesive from passing through. It should be noted that, for example... Figure 6 , Figure 7 and Figure 8 As shown, the connecting groove 330 can be stepped, toothed, or wavy. The ends of the first side 310 and the second side 320 can be joined together through the connecting groove 330 to achieve a more secure splicing. The stepped, toothed, or wavy connecting groove 330 can increase the contact area between the first side 310 and the second side 320, thereby improving the splicing strength. The adhesive penetration path has multiple bends, making penetration more difficult. For example, with a toothed structure, the adhesive penetration path has multiple bends, which will generate greater resistance to the adhesive, causing the adhesive to stay in the middle of the joint area of ​​the first side 310 and the second side 320, and unable to enter the protection area of ​​the buffer frame 30, thus improving the tightness of the joint of the buffer frame 30. At the same time, due to the setting of the connecting groove 330, the first side 310 and the second side 320 in the buffer frame 30 have a unique joint position, which can achieve a more precise position setting of the buffer frame 30 and improve the installation accuracy.

[0037] Furthermore, it should be noted that in some embodiments of this disclosure, for the rectangular frame structure of the buffer frame 30, the distance between the two first sides 310 is 60mm-160mm, and the distance between the two second sides 320 is 145mm-320mm, so that the buffer frame 30 can form an enclosing area within the range of 60mm-160mm, thus satisfying sufficient protection against adhesive intrusion on the side of the single battery 10. It should be noted that the distance between the first sides 310 (60mm-160mm) determines the dimension of the buffer frame 30 in the width direction of the heat insulation pad 20, while the distance between the second sides 320 (145mm-320mm) determines the dimension of the buffer frame 30 in the length direction of the heat insulation pad 20. If either distance is too small, the buffer frame 30 will not effectively cover the side of the single battery 10, thereby reducing the protective effect of the buffer frame 30. If either distance is too large, it will occupy too much space, not only wasting the material of the buffer frame 30, but also increasing the outer perimeter of the buffer frame 30, resulting in a larger contact area with the adhesive and a greater risk of adhesive leakage. Therefore, the distance between the two first sides 310 is limited to 60mm-160mm, and the distance between the two second sides 320 is limited to 145mm-320mm, so as to reduce the material consumption and glue leakage risk of the buffer frame 30 while satisfying the area enclosure protection.

[0038] Furthermore, in the battery heat insulation structure provided in this embodiment, the buffer frame 30 and the heat insulation pad 20 can be freely arranged. Specifically, the buffer frame 30 can be arranged on one side of the heat insulation pad 20 in its thickness direction, that is, the heat insulation pad 20 is only provided with the buffer frame 30 on one side. During the assembly process, the heat insulation pad 20 and the buffer frame 30 can be pre-assembled first, and then the integrated structure can be installed on the side of the single battery 10. It should be noted that the integrated battery heat insulation structure can directly contact the side of the single battery 10 through the heat insulation pad 20, or it can directly contact the side of the single battery 10 through the buffer frame 30. Similarly, the heat insulation pad 20 can be fixed to the side of the single battery 10 first, and then the buffer frame 30 can be fixed on the side of the heat insulation pad 20 facing away from the single battery 10 to meet the requirements of buffering and expansion protection.

[0039] Similarly, buffer frames 30 can be provided on both sides of the heat insulation pad 20 in its thickness direction to form a double-sided protection structure. The buffer frames 30 on both sides of the heat insulation pad 20 not only make the battery heat insulation structure have a stronger buffer protection effect, but also allow direct contact between the sides of two adjacent individual cells 10 through the buffer frames 30, thus providing a direct buffering effect. It can also provide protective space for the side expansion of each individual cell 10, thus having a better protective effect. It should be noted that, similar to the aforementioned embodiment, the assembly of the battery heat insulation structure can also adopt an integrated pre-assembly, or the buffer frames 30 can be installed on the side of the battery first, and then the heat insulation pad 20 can be fixed to complete the installation.

[0040] Furthermore, in another aspect of the present disclosure, a single battery cell is provided, wherein the battery cell is fixedly provided with the battery heat insulation structure provided in any of the above embodiments on its side surface. It should be noted that since the battery heat insulation structure has the technical effects provided in any of the above embodiments, the single battery cell also has the above technical effects, which will not be repeated here.

[0041] Furthermore, other aspects of this disclosure also provide a battery pack in which the individual cells provided in the above embodiments are stacked, such that after the individual cells are stacked, there are one or two battery heat insulation structures provided in the aforementioned embodiments between the sides of two adjacent individual cells. It should also be noted that since the individual cell has the technical effects provided by any of the above embodiments, the battery pack also has the above technical effects, which will not be repeated here.

[0042] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery heat insulation structure, characterized in that, include: A heat insulation pad (20) is disposed on the side of the single cell (10); A buffer frame (30) is fixedly installed on the heat insulation pad (20). The buffer frame (30) is a closed frame structure, and the distance between the outer edge of one side of the buffer frame (30) and the edge of the heat insulation pad (20) closest to it is 0-20mm. The area of ​​the buffer frame (30) on the heat insulation pad (20) is 5%-50%.

2. The battery heat insulation structure as described in claim 1, characterized in that, The buffer frame (30) is a frame structure formed by splicing, and includes a set of first sides (310) and a set of second sides (320). The first sides (310) are arranged in parallel, and the second sides (320) are arranged in parallel. The first sides (310) and the second sides (320) are spliced ​​to form a rectangular structure.

3. The battery heat insulation structure as described in claim 2, characterized in that, The first side (310) is arranged along the length direction of the heat insulation pad (20), and the second side (320) abuts against one of the first side (310) at each of its two end edges in the length direction, and the compression ratio of the two side regions of the second side (320) in the length direction is greater than the compression ratio of the middle region.

4. The battery heat insulation structure as described in claim 2, characterized in that, The second side (320) is arranged along the width direction of the heat insulation pad (20), and the first side (310) abuts against one of the second sides (320) at both ends in the length direction, and the compression ratio of the two side regions of the first side (310) in the length direction is greater than the compression ratio of the middle region.

5. The battery heat insulation structure as described in claim 2, characterized in that, A connecting groove (330) is provided at the end of the first side (310) and / or the second side (320). The connecting groove (330) is stepped, toothed or wavy. The ends of the first side (310) and the second side (320) are fitted together through the connecting groove (330).

6. The battery heat insulation structure as described in claim 2, characterized in that, The distance between the two first sides (310) is 60mm-160mm, and the distance between the two second sides (320) is 145mm-320mm.

7. The battery heat insulation structure as described in claim 1, characterized in that, The buffer frame (30) is an integral rectangular frame, rhomboid frame or elliptical frame structure.

8. The battery heat insulation structure as described in claim 1, characterized in that, The buffer frame (30) is disposed on one side of the heat insulation pad (20) in its thickness direction, or the heat insulation pad (20) is provided with the buffer frame (30) on both sides in its thickness direction.

9. A single-cell battery, characterized in that, A battery heat insulation structure as described in any one of claims 1-8 is fixedly provided on the side.

10. A battery pack, characterized in that, The internal stack is provided with the single cell as described in claim 9.

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