Heat insulation pad, battery pack and vehicle

Abstract

The utility model relates to a heat insulation pad, a battery pack and a vehicle, and the heat insulation pad comprises a frame and a core body; the core body comprises a heat insulation part and a liquid storage part, the liquid storage part comprises a shell filled with liquid, the shell is a thermosensitive shell, and the frame is arranged in the circumferential direction of the core body and fixed to the core body. The heat insulation pad can realize heat insulation and cooling effects between the large surfaces of the battery cells, so that the safety of the battery pack is ensured, and the situation that the thickness of the heat insulation pad is relatively large and the occupied space is relatively large can be avoided.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a heat insulation pad, a battery pack, and a vehicle. Background Technology

[0002] Thermal insulation pads are placed between the battery cells. These pads prevent the rapid transfer of high temperatures to surrounding cells in the event of thermal runaway in a single cell, thus avoiding a chain reaction that could ultimately lead to a fire or explosion of the entire battery pack, thereby improving safety. Furthermore, the thermal insulation pads fill the gaps between the cells, enhancing the overall structural stability of the battery pack and making it more resistant to external impacts and vibrations. The thermal insulation pads also possess a degree of elasticity and cushioning, absorbing volume changes that occur during charging and discharging and reducing vibration and friction between the cells. In addition, they provide some electrical insulation, preventing short circuits between the cells.

[0003] In existing technologies, thermal insulation pads mainly use core materials with low thermal conductivity, such as aerogel and nanoplates, to achieve thermal insulation. When a cell experiences thermal runaway, the thermal insulation effect of the aerogel controls the surface temperature of adjacent cells, ensuring that adjacent cells are not triggered into thermal runaway. However, with changes in the cell system, the ejector temperature during cell thermal runaway is becoming increasingly higher. To ensure safety, the thickness of the core material needs to be increased to achieve better thermal insulation, which occupies space within the battery pack and affects the cell arrangement.

[0004] Therefore, how to ensure the safety of the battery pack while avoiding the large space occupied by the thick heat insulation pad is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a heat insulation pad, a battery pack, and a vehicle that can ensure the safety of the battery pack while avoiding the situation where the heat insulation pad occupies a large amount of space due to its large thickness.

[0006] To solve the above-mentioned technical problems, this application provides a heat insulation pad, including a frame and a core; the core includes a heat insulation part and a liquid storage part, the liquid storage part includes an outer shell containing liquid inside, the outer shell is a heat-sensitive outer shell, and the frame is arranged along the circumference of the core and fixed to the core.

[0007] Optionally, the housing includes an edge-sealing structure disposed on the sidewall surface facing the heat insulation portion.

[0008] Optionally, the outer shell is a PET shell or an aluminum-plastic film.

[0009] Optionally, the heat insulation portion and the liquid storage portion are stacked along the height direction.

[0010] Optionally, the top of the liquid storage section is provided with a first groove that is adapted to the heat insulation section, and the heat insulation section is located in the first groove.

[0011] Optionally, the ratio of the volume of the heat insulation part to the volume of the core is not less than 2 / 5;

[0012] And / or, the ratio of the height of the heat insulation part to the height of the core is not greater than 2 / 3.

[0013] Optionally, the liquid storage section and the heat insulation section are spliced ​​together along the length direction, and there are two liquid storage sections, with the heat insulation section disposed between the two liquid storage sections.

[0014] Optionally, the total length of the two liquid storage sections is greater than the total length of the heat insulation section, and the length of the heat insulation section is not less than 2 / 5 of the total length of the core.

[0015] Optionally, the lower side wall of the heat insulation part is provided with a first step structure, the liquid storage part is in contact with the step surface of the first step structure, and the side surface of the liquid storage part away from the step surface is aligned with the side wall surface of the heat insulation part.

[0016] Alternatively, one side surface of the heat insulation part is provided with a second groove that is adapted to the liquid storage part, and the liquid storage part is located in the second groove.

[0017] Optionally, the number of the frame edges is two, and the two frame edges are respectively located on both sides of the core and fixed to the core.

[0018] Optionally, the number of the borders is one, the core is located within the area enclosed by the borders, and the thickness of the core is less than the thickness of the borders.

[0019] Optionally, it further includes an encapsulation layer encapsulated outside the frame and the core to fix the frame and the core.

[0020] This application also provides a battery pack, including battery cells and a heat insulation pad as described above, the heat insulation pad being sandwiched between the large surfaces of two adjacent battery cells.

[0021] This application also provides a vehicle including the battery pack described above.

[0022] The heat insulation pad, battery pack, and vehicle provided in this application have the following technical advantages compared to existing solutions:

[0023] Liquids are excellent phase change materials. When individual cells experience thermal runaway, the temperature inside the battery pack rises sharply, the outer casing of the liquid storage compartment ruptures, and the liquid stored inside leaks out. This liquid absorbs heat and evaporates, changing from a liquid state to a gaseous state. Since the liquid needs to absorb heat during the process of changing from a liquid state to a gaseous state, it can effectively reduce the temperature of adjacent cells.

[0024] When the core is configured to include a heat insulation section and a liquid storage section, the heat insulation section provides heat insulation, while the liquid storage section stores liquid. In the event of thermal runaway, the liquid evaporates into vapor, absorbing a large amount of heat to actively cool the cell and prevent heat spread. This ensures safety during thermal runaway while maintaining the same core thickness. It also avoids the situation where the heat insulation pad occupies too much space in the battery pack, affecting the cell arrangement. With the same battery pack size, more cells can be arranged, which helps to improve the energy density of the battery pack and thus improve the vehicle's range. Attached Figure Description

[0025] Figure 1 This is an exploded view of the heat insulation pad and battery cell provided in the embodiments of this application;

[0026] Figure 2 This is a top view of the structure of the heat insulation pad at the factory.

[0027] Figure 3 yes Figure 2 Exploded view;

[0028] Figure 4 This is a structural diagram of the first arrangement of the core;

[0029] Figure 5 This is a structural diagram of the second arrangement of the core;

[0030] Figure 5a yes Figure 5 Schematic diagram of the central liquid storage section;

[0031] Figure 6 This is a structural diagram of the third arrangement of the core;

[0032] Figure 7 This is a structural diagram of the fourth arrangement of the core;

[0033] Figure 7a yes Figure 7 Schematic diagram of the structure of the central heat insulation section;

[0034] Figure 8 This is a structural diagram of the fifth arrangement of the core;

[0035] Figure 8a yes Figure 8 Schematic diagram of the structure of the central heat insulation section;

[0036] Figure 9 This is a top view of the insulation pad with two borders, after removing the encapsulation layer;

[0037] Figure 10 yes Figure 9 Exploded view;

[0038] Figure 11 This is a schematic diagram of the structure of a heat insulation pad with a border, after removing the encapsulation layer;

[0039] Figure 12 This is a schematic diagram of the border structure.

[0040] Appendix Figures 1-12 The reference numerals in the attached figures are explained as follows:

[0041] 10 heat insulation pads; 20 battery cells; 201 large surface area;

[0042] 1. Border;

[0043] 2 cores, 21 heat insulation part, 211 second groove, 212 first step structure, 22 liquid storage part, 221 first groove, 222 edge-sealing structure;

[0044] 3 encapsulation layers, 31 recessed structure;

[0045] 4. Second adhesive layer;

[0046] 5 release layers, 51 operating ears. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] This application provides a heat insulation pad, a battery pack, and a vehicle. The vehicle includes a battery pack containing multiple battery cells 20 arranged in parallel. The large surfaces 201 (the side wall with the largest area) of two adjacent parallel battery cells 20 are positioned opposite each other. Furthermore, as... Figure 1 As shown, a heat insulation pad 10 is installed between two adjacent battery cells 20. This heat insulation pad 10 serves to insulate the cells 20 from heat in the event of thermal runaway in a single cell 20, preventing rapid heat transfer to adjacent cells and thus avoiding a chain reaction. This reduces the probability of the entire battery pack catching fire or exploding, improving safety. Furthermore, the heat insulation pad 10 also provides electrical insulation, preventing short circuits between the cells 20.

[0049] like Figure 3As shown, the heat insulation pad 10 includes a frame 1 and a core 2, wherein the frame 1 is arranged circumferentially along the core 2 and fixed to the core 2. The core 2 includes a heat insulation part 21 and a liquid storage part 22, wherein the liquid storage part 22 includes an outer shell containing liquid inside. This outer shell is a heat-sensitive shell. When the temperature exceeds a preset temperature (e.g., 85°C), the heat-sensitive shell ruptures, and the liquid stored inside leaks out. The outer shell can be a PET (polyethylene terephthalate) shell or an aluminum-plastic film, which has a relatively low cost.

[0050] In this embodiment, the heat insulation part 21 can be made of traditional heat insulation pad materials, such as aerogel layer, nanoplate, etc., to play a heat insulation role between the battery cells 20. There are no restrictions on the liquid stored in the liquid storage part 22, and it can be water, ethanol, ethylene glycol, and mixtures, etc.

[0051] Liquids are excellent phase change materials. When individual cells 20 experience thermal runaway, the temperature inside the battery pack rises sharply, the outer casing of the liquid storage section 22 ruptures, and the liquid stored inside leaks out. This liquid absorbs heat and evaporates, changing from a liquid to a gaseous state. Since the liquid absorbs heat during the evaporation process, it can effectively reduce the temperature of adjacent cells. Taking water as an example, water's maximum temperature at normal atmospheric pressure is 100°C. Absorbing heat will only cause it to boil and vaporize, without raising its temperature. Therefore, the evaporation of water absorbed by the liquid storage section 22 can reduce the temperature inside the battery pack. Before the water in the liquid storage section 22 completely evaporates, the maximum temperature of adjacent cells 20 will not exceed 100°C. This effectively prolongs the time before adjacent cells 20 experience thermal runaway, reduces the probability of heat spread, lowers the probability of the entire battery pack catching fire or exploding, and improves safety.

[0052] Taking water as the liquid stored in the liquid storage section 22, and assuming 50g of water leaks after thermal runaway causes the outer shell to rupture, the total amount of heat that 50g of water can absorb when boiling from an initial temperature of 50℃ to 100℃ is:

[0053] Heat absorbed during temperature rise: 4.2 (specific heat capacity of water) × 50g × 50℃ = 10500J = 10.5kJ;

[0054] Boiling endothermic reaction: 2260 (heat capacity of vaporization) × 50g = 113000J = 113kJ;

[0055] Total heat absorbed = 10.5 + 113 = 123.5 kJ;

[0056] Assuming a specific heat of 1, if the mass of cell 20 is 2.3 kg, the heat absorbed by the 50 g of water in the liquid storage section 22 as it completely changes from liquid to gas can reduce the temperature of a single cell 20 by 53.7 °C, resulting in a significant cooling effect.

[0057] Water rapidly absorbs heat during thermal runaway due to its phase change. With a latent heat of 2260 kJ / kg, the more water stored in the reservoir 22, the more heat it carries away during thermal runaway, effectively preventing heat propagation and improving overall package safety.

[0058] With the changes in the battery cell 20 system, the temperature emitted during thermal runaway of the battery cell 20 is also increasing. To ensure safety, the requirements for the thermal insulation performance of the heat insulation pad 10 between the battery cells 20 are also higher. Compared with the traditional heat insulation pad 10 that only uses aerogel components, when the core body 2 is configured to include a heat insulation part 21 and a liquid storage part 22, the heat insulation part 21 plays a role in heat insulation, and the liquid storage part 22 stores liquid. In the event of thermal runaway, the large amount of heat absorbed by the liquid evaporating into vapor can actively cool the battery cell 20 and prevent heat spread. This can ensure safety during thermal runaway when the core body 2 has the same thickness, and avoid the situation where the heat insulation pad 10 occupies a large space in the battery pack and affects the arrangement of the battery cells 20. With the same battery pack size, more battery cells 20 can be arranged, which is conducive to improving the energy density of the battery pack and thus improving the vehicle's range.

[0059] like Figure 4 As shown, the outer shell of the liquid storage part 22 is also provided with an edge-sealing structure 222. Of course, the liquid storage part 22 can also be provided with an edge-sealing structure instead of an edge-sealing structure 222. The edge-sealing structure 222 is more conducive to a better fit between the liquid storage part 22 and the heat insulation part 21, and the overall structure is more regular.

[0060] The specific arrangement of the heat insulation section 21 and the liquid storage section 22 is not limited, including but not limited to, Figures 4-7 The five arrangement methods are shown.

[0061] like Figure 4 In the first arrangement shown, the heat insulation part 21 and the liquid storage part 22 can be stacked along the height direction. The heat insulation part 21 and the liquid storage part 22 are spliced ​​vertically. Both the heat insulation part 21 and the liquid storage part 22 are regular square structures, which are simple in structure and have high material utilization. The height of the heat insulation part 21 is a, the height of the liquid storage part 22 is b, and the total height of the core 2 is a+b. The ratio of the height of the liquid storage part 22 to the total height of the core 2 is not less than 1 / 3, that is, b / (a+b) ≥1 / 3, to ensure that the liquid storage part 22 can store a sufficient amount of liquid to ensure that the cooling effect is achieved through liquid evaporation.

[0062] like Figure 5 and Figure 5aIn the second arrangement shown, the top of the liquid storage section 22 has an upward-opening first groove 221, meaning the liquid storage section 22 has an upward-opening U-shaped structure. The size and shape of the first groove 221 are adapted to the heat insulation section 21, and the heat insulation section 21 is located exactly within the first groove 221. Essentially, the liquid storage section 22 surrounds the bottom and left and right sides of the heat insulation section 21. The liquid storage section 22 is configured as a structure including a first section, a second section, and a third section arranged in the left-right direction. The first, second, and third sections can be an integral structure or a separate structure. The first and third sections are located on the sides of the heat insulation section 21, and the second section is located at the bottom of the heat insulation section 21. The bottoms of the first, second, and third sections extend downwards to the bottom end face of the core 2. The liquid storage section 22 has a large volume, which effectively ensures the liquid storage capacity, thereby ensuring the cooling effect of the battery cell 20 through liquid evaporation.

[0063] The width of the first and third segments is *c*, and the width of the second segment and the insulation section 21 is *d*. The height of the insulation section 21 is *e*. The volume of the insulation section 21 is no less than 2 / 5 of the volume of the core 2 to ensure the insulation effect. Furthermore, the height *e* of the insulation section 21 is no more than 2 / 3 of the total height of the core 2 to ensure the liquid storage capacity of the liquid storage section 22. With this configuration, the insulation section 21 can cover the middle position and the upper position in the height direction of the cell 20. In the event of thermal runaway, the insulation section 21 is close to the highest temperature point of the cell 20, blocking heat transmission and improving safety.

[0064] Of course, in this embodiment, the heat insulation part 21 can also be configured as a T-shaped structure, that is, the top of the first segment and the third segment can also be provided with the heat insulation part 21. And if the heat insulation part 21 is completely set in the first groove 221, its structure is square and the structure is simpler.

[0065] like Figure 6 In the third arrangement shown, the heat insulation part 21 and the liquid storage part 22 are spliced ​​along the left and right direction. In the embodiment shown in the figure, one heat insulation part 21 is set between two liquid storage parts 22. The width of the heat insulation part 21 is g, and the width of the two liquid storage parts 22 is f. That is, the two liquid storage parts 22 are symmetrically arranged on both sides of the heat insulation part 21. The total width of the liquid storage part 22 is 2f. The total length of the core 2 in the left and right direction is g+2f. The total length of the liquid storage part 22, 2f, is not less than the length g of the heat insulation part 21. Furthermore, the ratio of the length g of the heat insulation part 21 to the total length of the core 2 is not less than 2 / 5, that is, 2f≥g≥2 / 5(g+2f), so as to ensure the heat insulation effect and the liquid storage volume.

[0066] Of course, there can also be two heat insulation parts 21 and one liquid storage part 22 located between the two heat insulation parts 21, or one heat insulation part 21 and one liquid storage part 22 spliced ​​together in the left and right direction, or the number of heat insulation parts 21 and the number of liquid storage parts 22 can also be other.

[0067] The two liquid storage sections 22 are located on both sides of the heat insulation section 21, which simplifies the overall structure. The symmetrical arrangement of the liquid storage sections 22 on both sides of the heat insulation section 21 further ensures the effect of liquid evaporation absorbing heat to reduce the temperature of the battery cell 20 in the event of thermal runaway. Furthermore, the heat insulation section 21 is located in the middle of the core 2. When the battery cell 20 experiences thermal runaway, the heat insulation section 21 is close to the highest temperature point of the battery cell 20 at the time of thermal runaway, which is conducive to achieving the heat insulation effect and ensuring safety.

[0068] like Figure 7 and Figure 8 As shown, the heat insulation part 21 and the liquid storage part 22 also include portions that are stacked along the thickness direction.

[0069] like Figure 7 and Figure 7a In the fourth arrangement shown, a first step structure 212 is also provided on the lower side wall of the heat insulation part 21. The liquid storage part 22 is in contact with the step surface of the first step structure 212, and the side surface of the liquid storage part 22 away from the step surface is aligned with the side wall surface of the heat insulation part 21. That is to say, the upper part of the core 2 is the heat insulation part 21, and the lower part is a structure in which the heat insulation part 21 and the liquid storage part 22 are spliced ​​together in the thickness direction. At this time, the heat insulation part 21 has a similar inverted L-shaped structure.

[0070] Or, it could also be like Figure 8 and Figure 8a In the fifth arrangement shown, a second groove 211 is provided on one side wall of the heat insulation part 21. The size and shape of the second groove 211 are adapted to the liquid storage part 22, and the liquid storage part 22 is located in the second groove 211.

[0071] Alternatively, the core 2 can be formed entirely by splicing the heat insulation part 21 and the liquid storage part 22 along the thickness direction. Figure 7 and Figure 8 The solution shown can ensure the liquid storage capacity of the liquid storage section 22 while also ensuring the heat insulation capacity of the top heat insulation section 21, thus providing higher safety.

[0072] Of course, in this embodiment, the specific shapes of the heat insulation part 21 and the liquid storage part 22 are not limited, and can be any shape such as triangle, trapezoid, square, circle, etc.

[0073] The frame 1 is arranged circumferentially along the core 2, serving as a buffer and support between the two cells 20, filling the gap between them, and enhancing the overall structural stability of the battery pack, making it more resistant to external impacts and vibrations. The frame 1 is preferably a plastic frame 1, although the material is not limited; plastic can also be used. The plastic frame 1 provides sufficient support strength while also exhibiting elasticity and buffering capacity through deformation, absorbing volume changes during charging and discharging, and reducing vibration and friction between the cells 20.

[0074] The side wall of the large surface 201 of the core 2 facing the cell 20 does not protrude from the side wall of the frame 1. The frame 1 can play a buffering and supporting role between the two cells 20, while the middle position of the frame 1 can also provide space for the cell 20 to bulge.

[0075] The number of borders 1 can be as follows Figure 9 and Figure 10 As shown in the two examples, the core 2 is sandwiched between the two side frames 1 and fixed to the side frames 1. In other words, the side frames 1, core 2, and side frames 1 are stacked in sequence. At this time, the core 2 has a larger area and better heat insulation and cooling effect.

[0076] The core 2 and the frame 1 are bonded and fixed together by a first adhesive layer, such as double-sided tape. Bonding and fixing the core 2 and the frame 1 together by the first adhesive layer simplifies the fixing process.

[0077] The number of borders can also be one, such as... Figure 2 , Figure 3 and Figure 11 As shown, the frame 1 is a square frame formed by four sides connected end to end. The core 2 is located within the space of this square frame, and the thickness of the core 2 is less than the thickness of the frame 1, so that the sidewalls of the core 2 do not protrude from the sides of the frame 1. This design allows the thickness of the frame 1 and the width of each side to be designed according to the spacing between the two battery cells 20 and the design requirements for support. The structure of the frame 1 is as follows... Figure 12 As shown, the dimensions of the four sides of border 1 can be the same or different, and can be set according to the actual situation.

[0078] Furthermore, when the number of border 1s is one, such as Figure 2 and Figure 3 As shown, the heat insulation pad 20 also includes an encapsulation layer 3, which can be encapsulated around the frame 1 and the core 2 to fix the frame 1 and the core 2 into a plate-like structure. The encapsulation layer 3 can play a fixing role to fix the frame 1 and the core 2, ensuring stability in the installed state. At the same time, the encapsulation layer 3 can also prevent the problem of insulation withstand voltage failure of the entire package.

[0079] When there is only one frame 1, the thickness of the frame 1 is greater than the thickness of the core 2. There are two encapsulation layers 3, which are respectively encapsulated on both sides of the frame 1 and the core 2, and can form a recessed structure 31 at the inner edge of the frame 1.

[0080] The material of the encapsulation layer 3 is not limited; it can be a PET layer, a PC layer, or a PE layer, etc.

[0081] The heat insulation pad 10 is sandwiched between the large surfaces 201 of the two battery cells 20. To ensure stability during installation, a second adhesive layer 4 can be used to fix the heat insulation pad 10 between its side wall and the large surface 201 of the battery cell 20. The second adhesive layer 4 can be a double-sided adhesive layer. The adhesive layer 4 is arranged along the circumference of the heat insulation pad 10, specifically along the circumference of the frame 1, and located on the outer surface of the frame 1 or the outer surface of the encapsulation layer 3.

[0082] When the heat insulation pad 10 leaves the factory, if Figure 2 and Figure 3 As shown, the second adhesive layer 4 can be directly applied to the outer surface of the heat insulation pad 10. The heat insulation pad 10 also includes two release layers 5, which are respectively applied to both sides of the heat insulation pad 10 and fixed by the second adhesive layer 4. That is to say, at the factory, the two release layers 5 provide protection for the second adhesive layer 4 on both sides of the heat insulation pad 10. During installation, the operator can directly remove the release layer 5 and attach it to the large surface 201 of the battery cell 20 through the second adhesive layer 4. The installation operation is relatively convenient and facilitates the improvement of battery pack assembly efficiency.

[0083] And, as Figure 2 and Figure 3 As shown, the release layer 5 also has an operating ear 51 extending outward from its side. During installation, the operating ear 51 can be used to act on the release layer 5 to make it detach from the second adhesive layer 4. The operating ear 51 can be formed by extending outward from the edge of any position in the circumference of the release layer 5.

[0084] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0086] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A thermal insulation mat, characterized in that, The frame (1) and the core (2) are included. The core (2) includes a heat insulation part (21) and a liquid storage part (22), the liquid storage part (22) includes a shell filled with liquid, the shell is a heat-sensitive shell, and the frame (1) is arranged along the circumference of the core (2) and fixed with the core (2).

2. The insulating mat according to claim 1, characterized in that The shell includes a flange structure (222) arranged on the side wall surface facing the heat insulation part (21).

3. The insulating mat of claim 1, wherein, The shell is a PET shell or an aluminum plastic film.

4. The insulating mat according to any one of claims 1 to 3, characterized in that The heat insulation part (21) and the liquid storage part (22) are arranged in a stacked manner along the height direction.

5. The insulating mat according to any one of claims 1 to 3, characterized in that The top of the liquid storage part (22) is provided with a first groove (221) matched with the heat insulation part (21), and the heat insulation part (21) is located in the first groove (221).

6. The insulating mat of claim 5, wherein, The ratio of the volume of the heat insulation part (21) to the volume of the core (2) is not less than 2 / 5. And / or, the ratio of the height of the heat insulation part (21) to the height of the core (2) is not more than 2 / 3.

7. The insulating mat according to any one of claims 1 to 3, characterized in that The liquid storage part (22) and the heat insulation part (21) are arranged in a spliced manner along the length direction, and the number of the liquid storage part (22) is two, and the heat insulation part (21) is arranged between the two liquid storage parts (22).

8. The insulating mat of claim 7, wherein, The total length of the two liquid storage parts (22) is greater than the total length of the heat insulation part (21), and the length of the heat insulation part (21) is not less than 2 / 5 of the total length of the core (2).

9. The insulating mat according to any one of claims 1-3, characterized in that A first step structure (212) is arranged on one side wall surface of the lower part of the heat insulation part (21), the liquid storage part (22) is attached to the step surface of the first step structure (212), and the side surface of the liquid storage part (22) away from the step surface is aligned with the side wall surface of the heat insulation part (21). Alternatively, one side surface of the heat insulation part (21) is provided with a second groove (211) matched with the liquid storage part (22), and the liquid storage part (22) is located in the second groove (211).

10. The insulating mat according to any one of claims 1 to 9, characterized in that The number of the frame (1) is two, and the two frames (1) are respectively located on the two sides of the core (2) and fixed with the core (2).

11. The insulating mat according to any one of claims 1 to 9, characterized in that The number of the frame (1) is one, the core (2) is located in the area enclosed by the frame (1), and the thickness of the core (2) is less than the thickness of the frame (1).

12. The insulating mat of claim 11, wherein, A packaging layer (3) is further included, which is packaged outside the frame (1) and the core (2) to fix the frame (1) and the core (2).

13. A battery pack, characterized by, The battery pack includes the electric core (20) and the heat insulation pad as claimed in any one of claims 1-12, and the heat insulation pad is arranged between the large surfaces (201) of two adjacent electric cores (20).

14. A vehicle characterized by comprising: The battery pack includes the electric core (20) and the heat insulation pad as claimed in any one of claims 1-12, and the heat insulation pad is arranged between the large surfaces (201) of two adjacent electric cores (20).

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