Battery thermal insulation structure and single battery

Abstract

The application discloses a battery heat insulation structure and a single battery. The battery heat insulation structure comprises a heat insulation pad, a first buffer and a buffer assembly. The heat insulation pad is arranged on the side of the single battery. The first buffer is arranged on one side of the heat insulation pad close to the bottom of the single battery. The proportion of the first buffer in the length direction of the heat insulation pad is 30%-100%. The buffer assembly is connected with the first buffer. The compression rate of the first buffer is greater than the average compression rate of the buffer assembly. The area proportion of the first buffer and the buffer assembly on the heat insulation pad is not greater than 30%. The elastic effect of the first buffer and the buffer assembly can effectively fill the gap between adjacent single batteries. The compression rate of the first buffer is greater than the average compression rate of the buffer assembly. When the battery heat insulation structure is subjected to pressure, the first buffer can be greatly deformed to effectively seal one side of the heat insulation pad close to the bottom of the single battery, thereby reducing the risk of glue entering the side of the single battery.

Description

Technical Field

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

[0002] In battery packs composed of multiple stacked individual cells, heat insulation pads are needed between adjacent cells to reduce operational impact. However, filling the side gaps between adjacent cells with heat insulation pads can lead to insufficient expansion space for individual cells during operation, resulting in lithium plating and reduced cycle life. Currently, elastic buffer strips are typically added to the surface of the heat insulation pads. These buffer strips are independent strip structures that fill the side gaps between adjacent cells while allowing expansion space for individual cells. They also prevent adhesives from seeping into the sides of the cells during battery pack assembly, thus avoiding encroachment on the expansion space. However, the buffer strips can cause stress concentration during the expansion of the battery sides, which can also lead to lithium plating and affect the lifespan of individual cells.

[0003] Therefore, how to improve the lifespan of individual cells and reduce the risk of abnormal expansion 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 and a single battery cell to improve the service life of the single battery cell and reduce the risk of abnormal expansion.

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

[0006] A battery heat insulation structure, comprising:

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

[0008] The first buffer element is disposed on the side of the heat insulation pad near the bottom of the individual battery cell, and the first buffer element accounts for 30%-100% of the length of the heat insulation pad;

[0009] The buffer assembly is connected to both ends of the first buffer member. The buffer assembly is set along the edge of the heat insulation pad. The compression ratio of the first buffer member is greater than the average compression ratio of the buffer assembly. The combined structure of the first buffer member and the buffer assembly accounts for no more than 30% of the area of ​​the heat insulation pad.

[0010] 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, a first buffer member, and a buffer assembly. Specifically, the heat insulation pad is disposed on the side of a single cell to block the mutual influence caused by heat transfer between two adjacent single cells and to initially fill the gap between the two single cells. The first buffer member and the buffer assembly are both fixedly disposed on one side of the heat insulation pad. Through its elasticity, it can effectively fill the gap within a certain range and balance the assembly interval error between the single cells. Meanwhile, the first buffer is located on the side of the heat insulation pad near the bottom of the individual battery cell, and the first buffer accounts for 30%-100% of the length of the heat insulation pad. The first buffer located at the bottom also serves to block the adhesive at the bottom of the battery pack, and its length needs to meet the requirements of buffering and blocking. The buffer assembly is connected to both ends of the first buffer to cooperate with the first buffer to form a bottom-closed structure, which can block the adhesive. At the same time, the compression ratio of the first buffer is greater than the average compression ratio of the buffer assembly. When the battery heat insulation structure is subjected to pressure from the individual batteries on both sides, the first buffer can generate a large deformation, tending to extend to both ends in its length direction, and achieving a stable compression effect. It also effectively fills the gap between the two ends of the first buffer and the buffer assembly, thereby blocking the adhesive at the bottom of the battery pack. The adhesive cannot break through the first buffer from the bottom of the individual battery cell, thus maintaining the stable operation of the side area of ​​the individual battery cell and avoiding the problem of stress concentration during the expansion of the individual battery cell due to the adhesive solidifying on the side. In addition, the combined structure of the first buffer and the buffer assembly accounts for no more than 30% of the area on the heat insulation pad, so as to reserve sufficient expansion space and improve the service life of the single battery. Attached Figure Description

[0011] 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.

[0012] Figure 1 An exploded view of the battery heat insulation structure and a single battery cell provided in an embodiment of this utility model;

[0013] Figure 2 This is a front view of a battery heat insulation structure provided in an embodiment of the present invention on a single battery cell;

[0014] Figure 3 A schematic diagram of the cooperative structure of the buffer assembly and the first buffer element provided in an embodiment of the present invention;

[0015] Figure 4 A schematic diagram of the cooperation structure between the buffer assembly and the first buffer element provided in another embodiment of the present invention;

[0016] Figure 5 A schematic diagram of a buffer assembly structure including a third buffer element provided in an embodiment of the present invention;

[0017] Figure 6 A schematic diagram of the connecting groove structure provided in an embodiment of this utility model;

[0018] Figure 7 This is a schematic diagram of a connecting groove structure provided in another embodiment of the present invention;

[0019] Figure 8 This is a schematic diagram of the connecting groove structure provided for other embodiments of the present utility model;

[0020] Figure 9 This is a schematic diagram of the structure of a first buffer member disposed on a heat insulation pad according to an embodiment of the present invention;

[0021] Figure 10 A schematic diagram of the structure of a first buffer member disposed on a heat insulation pad according to another embodiment of the present invention;

[0022] Figure 11 A schematic diagram of the structure of the first buffer member disposed on the heat insulation pad for other embodiments of the present invention;

[0023] Figure 12 A schematic diagram of the structure of a first buffer member disposed on the side of a battery according to an embodiment of the present invention;

[0024] Figure 13 A schematic diagram of a first buffer member disposed on the side of a battery, according to another embodiment of the present invention;

[0025] Figure 14 A schematic diagram of the structure of the first buffer member disposed on the side of the battery for other embodiments of the present invention.

[0026] in:

[0027] 10-Heat insulation pad; 20-First buffer component; 30-Buffer assembly; 310-Second buffer component; 320-Third buffer component; 40-Connecting slot; 50-Single battery cell. Detailed Implementation

[0028] The core of this application is to disclose a battery heat insulation structure and a single battery cell, so as to improve the service life of the single battery cell and reduce the risk of abnormal expansion.

[0029] 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.

[0030] like Figure 1 and Figure 2 As shown, one aspect of this disclosure provides a battery heat insulation structure, which mainly includes a heat insulation pad 10, a first buffer 20, and a buffer assembly 30. The heat insulation pad 10 is disposed on the side of a single battery cell 50 to block heat transfer between adjacent single batteries 50, preventing mutual heat interference during operation. The heat insulation pad 10 can be made of glass fiber, ceramic fiber, or polymer heat insulation materials, which, while providing heat insulation, can also initially fill the gaps between adjacent single batteries 50.

[0031] Based on this, the first buffer 20 and the buffer assembly 30 are both fixedly disposed on one side of the heat insulation pad 10. The elasticity of the first buffer 20 and the buffer assembly 30 is better than that of the heat insulation pad 10. It should be noted that due to differences in production and assembly, the gap between adjacent single cells 50 is difficult to perfectly match with the heat insulation pad 10. Single cells 50 whose gaps cannot be fully filled have a greater risk of shaking when subjected to vibration and impact. The setting of the first buffer 20 and the buffer assembly 30 is to extend the heat insulation pad 10 in its thickness direction, and the design gap between two adjacent single cells 50 can match the elastic range of the first buffer 20 and the buffer assembly 30. In order to press the two adjacent single cells 50 against the first buffer 20 and the buffer assembly 30 during assembly, thereby filling the gap and improving the stability of the single cell 50.

[0032] However, the first buffer 20 and the buffer assembly 30 need to restrict the expansion space on the side of the individual battery 50 on the heat insulation pad 10. Therefore, the first buffer 20 and the buffer assembly 30 are only set in a part of the heat insulation pad 10. During the assembly of the battery pack, bottom adhesive needs to be applied. Due to the incomplete adhesion between the heat insulation pad 10 and the side of the individual battery 50, the adhesive will penetrate into the setting area of ​​the heat insulation pad 10. In order to prevent the adhesive from reaching the side of the individual battery 50 through the heat insulation pad 10 and occupying the expansion space on the side of the individual battery 50 after solidification, which would lead to abnormal expansion during battery operation and reduce the risk of reduced service life, in this embodiment of the present disclosure, the first buffer 20 is set on the side of the heat insulation pad 10 near the bottom of the individual battery 50 to block the adhesive, so that the adhesive cannot penetrate the upper side from the bottom of the individual battery 50. Specifically, as shown in the figure... Figure 3As shown, the proportion of the first buffer element 20 in the length direction of the heat insulation pad 10, i.e., the a / b value, is 30%-100%. It should be noted that if the length of the first buffer element 20 is too small, its buffering effect is poor, and the area restricted on the heat insulation pad 10 for the side expansion of the individual battery 50 is small, making it difficult to support the stable operation requirements of the individual battery 50. On the other hand, if the length of the first buffer element 20 is too large, although it can provide a larger expansion space for the individual battery 50, its contact area with the adhesive increases. Under pressure, it is difficult for the various areas of the first buffer element 20 to achieve uniform compression, resulting in a greater risk of adhesive leakage. Therefore, the proportion of the first buffer element 20 in the length direction of the heat insulation pad 10 is set to 30%-100% to ensure that the first buffer element 20 does not exceed the length direction of the heat insulation pad 10, thus balancing the difficulty of preventing leakage of the first buffer element 20 and the expansion space requirements of the individual battery 50.

[0033] Furthermore, the buffer assembly 30 is connected to both ends of the first buffer member 20 to cooperate with the first buffer member 20 to form a bottom-closed structure. Depending on the structure at the top of the buffer assembly 30, the buffer assembly 30 and the first buffer member 20 can form a U-shaped or closed frame structure, and both can seal both ends of the first buffer member 20 to achieve isolation of the glue.

[0034] It should be noted that the buffer assembly 30 and the first buffer member 20 can be configured as an integral structure. However, for the convenience of production and assembly, the buffer assembly 30 and the first buffer member 20 are usually configured as separate structures and are independently fixed on the heat insulation pad 10. Based on this, there will be an assembly gap between the end of the first buffer member 20 and the buffer assembly 30. Therefore, in the battery heat insulation structure provided in this embodiment, the compression ratio of the first buffer member 20 is greater than the average compression ratio of the buffer assembly 30. When the battery heat insulation structure is subjected to the pressure of the individual cells 50 on both sides, the first buffer member 20 can undergo a larger deformation relative to the buffer assembly 30, thereby tending to extend towards both ends in its length direction and achieving a stable pressing effect. The mating gap between the two ends of the first buffer member 20 and the buffer assembly 30 will be effectively filled due to the large deformation of the first buffer member 20, thereby effectively blocking the adhesive at the bottom of the battery pack. It should be noted that the buffer component 30 can be made of a uniform material or a combination of multiple materials, as long as the compression ratio of the first buffer component 20 is greater than the average compression ratio of the buffer component 30. Furthermore, for the first buffer component 20 itself, in order to improve the deformation effect of its two end regions to meet the gap filling requirements, the first buffer component 20 can also be designed with a structure where the compression ratio of the two side regions is greater than that of the middle region. This can also be achieved through local modification or splicing of different materials, so that under the same pressure, the two side regions of the first buffer component 20 are more prone to deformation than the middle region, thus better meeting the gap filling requirements at both ends of the first buffer component 20.

[0035] Furthermore, the combined structure of the first buffer element 20 and the buffer assembly 30 occupies no more than 30% of the area on the heat insulation pad 10. It should be noted that the larger the area of ​​the combined structure of the first buffer element 20 and the buffer assembly 30 on the heat insulation pad 10, the better the buffering effect and the blocking effect on the adhesive. However, it will reduce the area of ​​the closed or semi-closed area formed by the first buffer element 20 and the buffer assembly 30, and will not be able to reserve enough space for the side expansion of the single battery 50. Therefore, it is necessary to set the area of ​​the combined structure of the first buffer element 20 and the buffer assembly 30 on the heat insulation pad 10 to no more than 30% to avoid abnormal expansion of the single battery 50 during operation and improve the service life of the single battery 50.

[0036] Furthermore, in some embodiments of this disclosure, such as Figure 3As shown, the buffer assembly 30 includes two parallel and spaced-apart second buffer members 310. The two second buffer members 310 are respectively connected to the two ends of the first buffer member 20 in the length direction to form a U-shaped structure with the first buffer member 20. The U-shaped structure can not only provide more comprehensive buffer protection, but also the bottom of the U-shaped structure faces the bottom of the single cell 50. The adhesive is blocked by the first buffer member 20 at the bottom and extends a certain distance along the height direction of the single cell 50 on the second buffer member 310, but cannot reach the top of the second buffer member 310 and enter the protection area of ​​the U-shaped structure. The semi-closed structure formed by the U-shaped structure keeps the adhesive-free clean state and meets the expansion requirements of the side wall of the single cell 50.

[0037] It should be noted that, as Figure 4 As shown, the two second buffers 310 can also be set at an angle to cooperate with the first buffer 20 to form an upright or inverted trapezoidal structure. They only need to have sufficient height in the direction perpendicular to the first buffer 20 to avoid glue intrusion. At the same time, provided that the area ratio of the first buffer 20 to the buffer assembly 30 allows, the second buffer 310 can be set with a larger area to improve the buffering effect of the U-shaped structure.

[0038] Based on the above embodiments, for a single second buffer 310, such as Figure 3 As shown, the distance c between the second buffer 310 and the edge of the nearest heat insulation pad 10 is 0-30mm, so that the structure of the combination of the second buffer 310 and the first buffer 20 can be stably fixed on the heat insulation pad 10, and sufficient expansion space is reserved for the side wall of the single battery 50. Specifically, the second buffer 310 can be fitted to the edge of the nearest heat insulation pad 10 to improve the sealing effect; if the distance between the second buffer 310 and the edge of the nearest heat insulation pad 10 is too large, the distance between the two second buffers 310 will decrease, the enclosure area of ​​the U-shaped structure formed by the second buffer 310 and the first buffer 20 will decrease, that is, the expansion space reserved for the single battery 50 will decrease, and it will affect the smooth operation of the single battery 50.

[0039] Furthermore, in some embodiments of this disclosure, the compression ratio of the first buffer 20 is greater than that of the second buffer 310. Specifically, the compression ratio of the first buffer 20 satisfies a compression ratio of not less than 20% at 1 MPa, while the compression ratio of the second buffer 310 satisfies a compression ratio of not less than 3% at 1 MPa. When the combined structure of the first buffer 20 and the second buffer 310 is subjected to pressure, the first buffer 20 extends to both sides to a greater extent, effectively sealing the installation gap between the two. It should also be noted that if the compression ratio of the first buffer 20 is too small, the buffering performance will decrease, and its deformation capacity will be weak, making it unable to effectively fill the gap in its length direction; while if its compression ratio is too large, its strong compressibility will lead to over-compression in its thickness direction, resulting in the risk of glue leakage due to the inability to achieve tight filling. Therefore, limiting the compression ratio of the first buffer 20 and the second buffer 310 can improve the sealing effect of the first buffer 20 and the second buffer 310 on the internal enclosure area while satisfying the buffering effect of the battery heat insulation structure in its thickness direction, thereby reducing the risk of glue leakage.

[0040] It should also be noted that in the battery heat insulation structure provided in this embodiment, the compression ratio of the buffer pad is greater than that of the first buffer member and also greater than that of the buffer assembly. In some embodiments, the compression ratio of the buffer pad is not less than 20% at 1MPa. When the battery heat insulation structure is subjected to pressure, the buffer pad can achieve energy absorption and buffering effect with a large deformation effect, while the first buffer member and buffer assembly with weaker deformation effect can provide sufficient support effect. They will not cause the battery deformation space separated on the side of the battery to be squeezed and encroached due to excessive deformation. At the same time, they can also achieve effective sealing of the battery deformation space in the thickness direction through a certain degree of deformation.

[0041] In other embodiments of this disclosure, such as Figure 5As shown, the buffer assembly 30 includes two spaced-apart second buffers 310 and a third buffer 320. Specifically, the third buffer 320 is arranged parallel to the first buffer 20, and the third buffer 320, the two second buffers 310, and the first buffer 20 cooperate to form a closed rectangular frame structure. Preferably, the rectangular frame structure is a scaled structure based on the outer edge of the heat insulation pad 10, that is, the distance between the first buffer 20 and the bottom edge of the heat insulation pad 10 is equal to the distance between the third buffer 320 and the top edge of the heat insulation pad 10, while the distance between the two second buffers 310 and the adjacent side edge of the heat insulation pad 10 is equal, so as to improve the uniformity of the position of the combined structure of the first buffer 20 and the buffer assembly 30 on the heat insulation pad 10. It should also be noted that the closed rectangular frame structure can provide more comprehensive buffer protection. Compared with the U-shaped structure, the rectangular frame structure forms a complete buffer area on the side of the single cell 50, which can more effectively absorb and disperse the impact force from different directions. At the same time, its internal enclosed structure is a closed area, which can block impurities from all directions, ensuring the cleanliness of the expansion area restricted by the first buffer 20 and the buffer assembly 30 on the side wall of the single cell 50, and preventing impurities from occupying the expansion space.

[0042] Based on the above embodiments, the main body of the buffer assembly 30 is a U-shaped structure formed by the second buffer member 310 and the third buffer member 320. The first buffer member 20 is used to close the opening area of ​​the U-shaped structure. Furthermore, the connection between the second buffer member 310 and the third buffer member 320 can be a spliced ​​U-shaped structure or a one-piece molded U-shaped structure. It should be noted that a spliced ​​U-shaped structure refers to the second buffer member 310 and the third buffer member 320 being connected by splicing, which offers good flexibility and customizability, and is suitable for scenarios requiring partial adjustment or replacement of the buffer assembly 30. A one-piece U-shaped structure, on the other hand, refers to the second buffer member 310 and the third buffer member 320 being manufactured in one piece, resulting in stronger structural integrity and stability, and eliminating splicing gaps within the buffer assembly 30, thus avoiding potential connection defects caused by splicing.

[0043] Furthermore, it should be noted that, in order to meet the requirement that the compression ratio of the first buffer 20 is greater than the average compression ratio of the buffer assembly 30, in some embodiments of this disclosure, the first buffer 20 is made of microporous foamed polypropylene (MPP) material with a high compression ratio, while the second buffer 310 and the third buffer 320 of the buffer assembly 30 can both be made of silicone material with a low compression ratio to meet the compression ratio requirement, so that the first buffer 20 has a greater compression deformation capacity relative to the buffer assembly 30. In other embodiments, for the spliced ​​structure of the buffer assembly 30, the third buffer 320 and the first buffer 20 have the same material and size, and the two form two opposite sides of a rectangular frame to reduce the production, storage and transportation costs of the parts. That is, when the first buffer 20 is made of microporous foamed polypropylene material with a high compression ratio, the third buffer 320 is also made of microporous foamed polypropylene material, while the second buffer 310 is made of silicone material with a low compression ratio, so that the average compression ratio of the buffer assembly 30 is less than the compression ratio of the first buffer 20, thereby achieving the compression deformation of the first buffer 20 and the requirement for tight filling of the gaps.

[0044] In addition, it should be noted that, as Figure 6 As shown, the first buffer 20 and the second buffer 310 are provided with connecting grooves 40 at their mating ends, and the two are fitted together through the connecting grooves 40. Specifically, as shown... Figure 6 The docking area in the middle, and Figure 7 and Figure 8 As shown in the detailed structure, the connecting groove 40 can be stepped, toothed, or wavy. On the one hand, compared with a simple planar butt joint, the connecting groove 40 can increase the contact area of ​​the first buffer 20 and the second buffer 310, thereby improving the connection strength between them. On the other hand, the setting of the connecting groove 40 makes the process of adhesive penetration from the butt joint of the first buffer 20 and the second buffer 310 more difficult due to the multiple bends in the path. For example, with a toothed structure, the penetration path of the adhesive has multiple bends, which will generate greater resistance to the adhesive, causing the adhesive to stay in the middle of the butt joint area of ​​the first buffer 20 and the second buffer 310, and unable to enter the internal protective area of ​​both, thus improving the butt joint effect. It should also be noted that, due to the setting of the connecting groove 40, the first buffer 20 and the second buffer 310 have a unique butt joint position, which can achieve more precise positioning and improve installation accuracy.

[0045] It should be further explained that, in other splicing structures in the buffer assembly 30, such as when a third buffer 320 is provided, the docking area between the second buffer 310 and the third buffer 320 can also be provided with a connecting groove 40 structure to improve the docking strength and sealing effect.

[0046] Furthermore, in the battery heat insulation structure provided in this embodiment, the first buffer 20 and the buffer assembly 30 can be disposed on the side of the heat insulation pad 10 facing away from the single battery 50 in its thickness direction. That is, during the use of the battery heat insulation structure on the single battery 50, the heat insulation pad 10 is in direct contact with the side wall of the single battery 50. At the same time, during the assembly process, the heat insulation pad 10 and the first buffer 20 and the buffer assembly 30 can be pre-assembled first, and then the integrated structure can be installed on the side of the single battery 50, or the heat insulation pad 10 can be fixed on the side of the single battery 50 first, and then the first buffer 20 and the buffer assembly 30 can be fixed on the heat insulation pad 10.

[0047] It should be noted that the first buffer 20 and the buffer assembly 30 can also be disposed on the side of the heat insulation pad 10 facing the single battery 50 in its thickness direction, that is, the first buffer 20 and the buffer assembly 30 are in direct contact with the side of the single battery 50 and support the heat insulation pad 10. In this embodiment, the heat insulation pad 10 and the first buffer 20 and the buffer assembly 30 need to be pre-installed first, and then the integrated structure is installed on the side of the single battery 50 to complete the setting of the battery heat insulation structure.

[0048] Based on the structural relationship between the first buffer member 20 and the buffer assembly 30 in the heat insulation structure, and the cooperation structure between the heat insulation structure and the battery, this disclosure provides some specific embodiments for illustration, specifically:

[0049] It should also be noted that for the integrated buffer assembly 30, when the first buffer 20 is made of microporous foamed polypropylene, the entire buffer assembly 30 can be made of silicone.

[0050] The following description uses some specific embodiments of this disclosure as examples:

[0051] Example 1: As Figure 9 As shown, the buffer structure adopts a rectangular frame structure: the top and bottom use a material with a high compressibility (high foaming MPP), and the left and right sides use a silicone material with a low compressibility, which is attached to the heat insulation pad 10.

[0052] Example 2: Figure 9 As shown, the buffer structure adopts a rectangular frame structure: the left, right and upper parts use silicone material with low compressibility, and the lower part uses material with high compressibility (high foaming MPP), which is attached to the heat insulation pad 10.

[0053] Example 3: Figure 10 As shown, the buffer structure adopts a rectangular frame structure: the left, right and upper parts use one-piece silicone material with a low compressibility, and the lower part uses material with a high compressibility (high foaming MPP), which is attached to the heat insulation pad 10.

[0054] Example 4: Figure 11As shown, the buffer structure adopts a U-shaped frame structure: the lower part uses a material with a high compressibility (high foaming MPP), and the left and right sides use silicone material with a low compressibility, which is attached to the heat insulation pad 10.

[0055] Example 5: Figure 12 As shown, the buffer structure adopts a rectangular frame structure: the top and bottom use a material with a high compressibility (high foaming MPP), and the left and right sides use a silicone material with a lower compressibility, which is pasted onto the large surface of the battery.

[0056] Example 6: Figure 12 As shown, the buffer structure adopts a rectangular frame structure. The left, right and upper parts use silicone material with low compressibility, while the lower part uses material with high compressibility (high foaming MPP), which is pasted onto the large surface of the battery.

[0057] Example 7: Figure 13 As shown, the buffer structure adopts a rectangular frame structure. The left, right and upper parts are made of one-piece silicone material with a low compressibility, while the lower part is made of a material with a high compressibility (high foaming MPP), which is pasted onto the large surface of the battery.

[0058] Example 8: Figure 14 As shown, the buffer structure adopts a U-shaped frame structure: the lower part uses a material with a high compressibility (high foaming MPP), and the left and right sides use silicone material with a lower compressibility, which is pasted onto the large surface of the battery.

[0059] Furthermore, it should be noted that in some other embodiments of this disclosure, under conditions where the compressive force is sufficient, the first buffer member 20 can also be made of a material with a low compressibility, which can also meet the compressive sealing requirements, as detailed below:

[0060] Example 9: The buffer structure adopts a rectangular frame structure: the top and bottom use a material with a low compressibility (silicone), and the left and right sides use MPP material with a high compressibility, which is attached to the heat insulation pad 10;

[0061] Example 10: The buffer structure adopts a rectangular frame structure: the top, bottom and right parts use silicone material with low compressibility, and the left part uses material with high compressibility (high foaming MPP), which is attached to the heat insulation pad 10;

[0062] Example 11: The buffer structure adopts a rectangular frame structure: the top, bottom and left parts use silicone material with low compressibility, and the right part uses material with high compressibility (high foaming MPP), which is attached to the heat insulation pad 10;

[0063] Example 12: The buffer structure adopts a rectangular frame structure: the top and bottom use a material with a low compressibility (silicone), and the left and right sides use an MPP material with a high compressibility, which is pasted on the large surface of the battery;

[0064] Example 13: The buffer structure adopts a rectangular frame structure: the top, bottom and right parts use silicone material with low compressibility, and the left part uses material with high compressibility (high foaming MPP), which is pasted on the large surface of the battery;

[0065] Example 14: The buffer structure adopts a rectangular frame structure: the top, bottom and left parts use silicone material with low compression ratio, and the right part uses material with high compression ratio (high foaming MPP), which is pasted on the large surface of the battery.

[0066] Furthermore, in another aspect of the present disclosure, a single battery cell 50 is provided, wherein the single battery cell 50 has a battery heat insulation structure provided in any of the above embodiments fixedly disposed 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 50 also has the above technical effects, which will not be repeated here.

[0067] 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.

[0068] 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 (10) is disposed on the side of the single cell (50); The first buffer (20) is disposed on the side of the heat insulation pad (10) near the bottom of the single cell (50), and the first buffer (20) accounts for 30%-100% of the length of the heat insulation pad (10); A buffer assembly (30) is connected to both ends of the first buffer member (20). The buffer assembly (30) is arranged along the edge of the heat insulation pad (10). The compression ratio of the first buffer member (20) is greater than the average compression ratio of the buffer assembly (30). The combined structure of the first buffer member (20) and the buffer assembly (30) accounts for no more than 30% of the area of ​​the heat insulation pad (10).

2. The battery heat insulation structure as described in claim 1, characterized in that, The buffer assembly (30) includes two parallel and spaced second buffer members (310), which are respectively connected to the two ends of the first buffer member (20) in the length direction and form a U-shaped structure with the first buffer member (20).

3. The battery heat insulation structure as described in claim 2, characterized in that, The distance between a single second buffer (310) and the edge of its nearest heat insulation pad (10) is 0-30 mm.

4. The battery heat insulation structure as described in claim 2, characterized in that, The compression ratio of the first buffer (20) is not less than 20% at 1MPa, and the compression ratio of the second buffer (310) is not less than 3% at 1MPa.

5. The battery heat insulation structure as described in claim 1, characterized in that, The compression ratio of the heat insulation pad is greater than that of the first buffer and the buffer assembly.

6. The battery heat insulation structure as described in claim 2, characterized in that, The buffer assembly (30) further includes a third buffer (320), which is arranged in parallel with the first buffer (20). The buffer assembly (30) and the first buffer (20) form a closed rectangular frame structure.

7. The battery heat insulation structure as described in claim 6, characterized in that, The second buffer (310) and the third buffer (320) are spliced ​​U-shaped structures or integrated U-shaped structures.

8. The battery heat insulation structure as described in claim 6, characterized in that, The third buffer (320) is made of the same material and has the same dimensions as the first buffer (20).

9. The battery heat insulation structure as described in claim 8, characterized in that, The third buffer (320) and the first buffer (20) are both made of microporous foamed polypropylene (MPP), and the second buffer (310) is made of silicone.

10. The battery heat insulation structure as described in claim 1, characterized in that, The first buffer (20) is made of microporous foamed polypropylene (MPP), and the buffer assembly (30) is made entirely of silicone.

11. The battery heat insulation structure as described in claim 2, characterized in that, The first buffer (20) and the second buffer (310) are provided with connecting grooves (40) and fit together. The connecting grooves are stepped, toothed or wavy.

12. The battery heat insulation structure as described in claim 1, characterized in that, The first buffer (20) and the buffer assembly (30) are disposed on the side of the heat insulation pad (10) facing away from the single battery (50), or the first buffer (20) and the buffer assembly (30) are disposed between the heat insulation pad (10) and the single battery (50).

13. A single-cell battery, characterized in that, A battery heat insulation structure as described in any one of claims 1-12 is fixedly provided on the side.

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