A heat insulation pad, a battery pack, and a vehicle

Abstract

This application provides a heat insulation pad, a battery pack, and a vehicle that can reduce the risk of thermal runaway propagation in inverted battery cells. The heat insulation pad includes a liquid-absorbing heat insulation core and a liquid-absorbing portion, which are connected to the liquid-absorbing heat insulation core; when projected along the thickness direction of the liquid-absorbing heat insulation core, at least a portion of the projection of the liquid-absorbing portion is located outside the projection of the liquid-absorbing heat insulation core.

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] Please refer to Figure 10 , Figure 10 A schematic diagram of the assembly of an upright battery cell and a heat insulation pad.

[0003] The battery pack has multiple cells 02, with heat insulation pads (not shown in the figure) placed between adjacent cells 02. An explosion-proof valve is installed at the upper end of the cell 02, and a cooling pipe 01 is also located above the cell 02. In the event of thermal runaway of the cell 02, the high-temperature substance sprayed by the explosion-proof valve can melt the cooling pipe 01, and the coolant in the cooling pipe 01 can flow to the cell 02 for cooling, reducing the spread of thermal runaway.

[0004] Let's look again. Figure 11 , Figure 11 A schematic diagram of the structure for assembling an inverted battery cell and a heat insulation pad.

[0005] In the inverted structure, the explosion-proof valve of the battery cell 02 is located at the lower end of the battery cell 02, and the cooling pipe 01 is located below the explosion-proof valve accordingly. In this way, the coolant in the molten cooling pipe 01 flows downward and cannot flow to the battery cell 02, so it cannot play a cooling role. Utility Model Content

[0006] The purpose of this application is to provide a heat insulation pad, a battery pack, and a vehicle that can reduce the risk of thermal runaway propagation in inverted battery cells.

[0007] To solve the above-mentioned technical problems, this application provides a heat insulation pad, including a liquid-absorbing heat insulation core and a liquid-absorbing part, wherein the liquid-absorbing part and the liquid-absorbing heat insulation core are connected; when projected along the thickness direction of the liquid-absorbing heat insulation core, at least a portion of the projection of the liquid-absorbing part is located outside the projection of the liquid-absorbing heat insulation core.

[0008] Optionally, the liquid absorption part includes a first liquid absorption portion and a second liquid absorption portion, the first liquid absorption portion extending out of the liquid absorption heat insulation core, and the second liquid absorption portion connected to the liquid absorption heat insulation core.

[0009] Optionally, the second liquid-absorbing portion has a reciprocating bending or spiral structure.

[0010] Optionally, the liquid-absorbing portion includes at least two liquid-absorbing branch segments extending along the length direction of the liquid-absorbing heat insulation core, wherein the length direction, height direction, and thickness direction of the liquid-absorbing heat insulation core are perpendicular; and the extension directions of the at least two liquid-absorbing branch segments are opposite.

[0011] Optionally, the liquid-absorbing branch segment is a rope-like structure or a sheet-like structure, wherein the dimension of the sheet-like structure along the thickness direction of the liquid-absorbing heat insulation core is greater than the dimension of the sheet-like structure along the height direction of the liquid-absorbing heat insulation core.

[0012] Optionally, the heat insulation pad further includes an outer frame, and the outer frame is adhered to both sides of the liquid-absorbing heat insulation core in the thickness direction; the second liquid-absorbing portion is adhered to the liquid-absorbing heat insulation core, the outer frame is provided with a notch, and the liquid-absorbing portion passes through the notch to extend out of the liquid-absorbing heat insulation core.

[0013] Optionally, the first liquid-absorbing part and the second liquid-absorbing part are an integral structure, or the first liquid-absorbing part is bonded to the liquid-absorbing heat insulation core, or the first liquid-absorbing part is embedded in the liquid-absorbing heat insulation core.

[0014] Optionally, the heat insulation pad includes at least two of the liquid-absorbing portions.

[0015] Optionally, at least a portion of the liquid-absorbing portion is distributed along the length direction of the liquid-absorbing heat insulation core; or, at least one liquid-absorbing portion is distributed on either side surface of the liquid-absorbing heat insulation core along its thickness direction.

[0016] Optionally, the liquid-absorbing part is made of at least one of the following materials: cotton yarn, ceramic fiber, glass fiber, or plant fiber.

[0017] Optionally, the liquid-absorbing heat insulation core is made of the same material as the liquid-absorbing part; or, the liquid-absorbing heat insulation core is made of aerogel, which is different from the liquid-absorbing part.

[0018] This application also provides a battery pack including a plurality of battery cells and a cooling pipe located below the battery cells, wherein a heat insulation pad as described in any of the above claims is disposed between adjacent battery cells, and a portion of the liquid absorption portion is located below the cooling pipe.

[0019] Optionally, a portion of the liquid-absorbing section contacts the bottom of the cooling pipe.

[0020] This application also provides a vehicle including the battery pack described in any of the above claims, which has the same technical effects as the lubrication system described above. Attached Figure Description

[0021] Figure 1 This is an exploded structural diagram of the heat insulation pad and battery cell assembly in one embodiment of this application;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the heat insulation pad;

[0023] Figure 3 for Figure 2A schematic diagram of the structure after the heat insulation pad and battery cell are assembled;

[0024] Figure 4 This is a schematic diagram of the structure of multiple battery cells and cooling pipes assembled in an embodiment of this application;

[0025] Figure 5 for Figure 4 A schematic diagram of the structure of two adjacent battery cells;

[0026] Figure 6 for Figure 4 Schematic diagram of the intermediate cooling pipe;

[0027] Figure 7 for Figure 2 Schematic diagram of the structure of the heat insulation pad;

[0028] Figure 8 This is a schematic diagram of the structure of the heat insulation pad in another embodiment of this application;

[0029] Figure 9 This is an exploded schematic diagram of the heat insulation pad in another embodiment of this application;

[0030] Figure 10 A schematic diagram of the assembly of a positively positioned battery cell and a heat insulation pad;

[0031] Figure 11 A schematic diagram of the structure for assembling an inverted battery cell and a heat insulation pad.

[0032] The annotations in the attached figures are explained as follows:

[0033] 10-Insulation pad;

[0034] 101-Liquid-absorbing heat insulation core; 102-Outer frame; 102a-Notch; 103-Double-sided adhesive layer; 104-Liquid-absorbing section; 1041-First liquid-absorbing section; 10411-Liquid-absorbing branch section; 1042-Second liquid-absorbing section;

[0035] 20 - Battery cell; 201 - Explosion-proof valve; 202 - Electrode;

[0036] 30 - Cooling pipe; 30a - Flow channel;

[0037] 01-Cooling pipe; 02-Battery cell. Detailed Implementation

[0038] 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. In the embodiments of this application, the terms "first," "second," etc., are used only to describe the same or similar features, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0039] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the exploded structure of the heat insulation pad 10 and the battery cell 20 assembled in one embodiment of this application.

[0040] In this embodiment, the heat insulation pad 10 is placed between two adjacent cells 20 in the battery pack to prevent heat from being transferred to the surrounding cells 20 when a single cell 20 experiences thermal runaway, thus preventing heat spread and causing the battery pack to catch fire and explode. Figure 1 In this embodiment, the heat insulation pad 10 and the surface of the battery cell 20 are in contact. The heat insulation pad 10 is generally square in structure, specifically a rectangular plate structure, which is adapted to the large surface of the rectangular battery cell 20. The heat insulation pad 10 includes a liquid-absorbing heat insulation core 101, which is the main structure of the heat insulation pad 10.

[0041] To better position the heat insulation pad 10 between two adjacent battery cells 20, the heat insulation pad 10 may also include an outer frame 102. The outer frame 102 is adhered to both sides of the liquid-absorbing heat insulation core 101 in the thickness direction. These two sides of the liquid-absorbing heat insulation core 101 can be defined as the first side surface and the second side surface. Since the liquid-absorbing heat insulation core 101 has a square structure, the corresponding outer frame 102 can also be called a U-shaped frame, that is, it is adhered to the perimeter of the liquid-absorbing heat insulation core 101. The first side surface of the liquid-absorbing heat insulation core 101 is adhered to one outer frame 102, and the second side surface of the liquid-absorbing heat insulation core 101 is adhered to another outer frame 102. Specifically, this can be achieved through… Figure 1 The double-sided adhesive layer 103 shown in the diagram is used for bonding, and the outer frame 102 can be bonded to one side surface of the corresponding battery cell 20. More specifically, the outer frame 102, the battery cell 20, and the liquid-absorbing heat insulation core 101 can all be bonded together by means of adhesive. Figure 1 The double-sided adhesive layer 103 shown in the diagram is used for bonding. The double-sided adhesive layer 103 is firmly bonded and facilitates assembly operations.

[0042] You can continue to refer to this. Figure 2 and Figure 3 , Figure 2 for Figure 1 Schematic diagram of the structure of the heat insulation pad 10; Figure 3 for Figure 2 A schematic diagram of the structure after the heat insulation pad 10 and the battery cell 20 are assembled.

[0043] The heat insulation pad 10 in this embodiment further includes a liquid-absorbing portion 104, which is connected to the liquid-absorbing heat insulation core 101. Projecting along the thickness direction of the liquid-absorbing heat insulation core 101, at least a portion of the projection of the liquid-absorbing portion 104 lies outside the projection of the liquid-absorbing heat insulation core 101. For example, a portion of the projection of the liquid-absorbing portion 104 coincides with the projection of the liquid-absorbing heat insulation core 101, but a portion lies outside the projection of the liquid-absorbing heat insulation core 101. In this case, a portion of the liquid-absorbing portion 104 extends out of the liquid-absorbing heat insulation core 101 along a first direction. Figure 2In this embodiment, the portion extending out of the liquid-absorbing heat insulation core 101 can be defined as the first liquid-absorbing portion 1041 of the liquid-absorbing part 104. The first liquid-absorbing portion 1041 of the liquid-absorbing part 104 is a rope-like structure in this embodiment. The cross-sectional shape of the rope-like structure is not limited; it can be circular or square. The first direction is perpendicular to the thickness direction of the liquid-absorbing heat insulation core 101. Specifically, in use, as... Figure 3 As shown, the first direction can be downward.

[0044] Let's look again. Figures 4 to 6 , Figure 4 This is a schematic diagram of the structure of multiple battery cells 20 and cooling pipes 30 assembled in an embodiment of this application; Figure 5 for Figure 4 A schematic diagram of the structure of two adjacent battery cells 20; Figure 6 for Figure 4 The schematic diagram of the cooling pipe 30 shows that, in this embodiment, the cooling pipe 30 is a harmonica tube, meaning that the cooling pipe 30 has multiple parallel flow channels 30a, in which coolant can flow to cool the battery cell 20. Figure 4 , 5 The liquid-absorbing part 104 of the heat insulation pad 10 is not shown in the figure.

[0045] from Figures 4 to 6 It can be seen that an explosion-proof valve 201 is provided at one end of the battery cell 20, and a cooling pipe 30 is also provided at this end of the battery cell 20. If the battery cell 20 experiences thermal runaway, the explosion-proof valve 201 will open, and the high-temperature material inside the battery cell 20 will be ejected from the explosion-proof valve 201 and melt the cooling pipe 30, causing the coolant inside the cooling pipe 30 to flow out. To facilitate melting, the cooling pipe 30 is made of, for example, plastic. In this embodiment, the explosion-proof valve 201 of the battery cell 20 used in the heat insulation pad 10 is located at the lower end, that is, when the battery pack is installed on the vehicle, the explosion-proof valve 201 of the battery cell 20 is set downwards, and the cooling pipe 30 is located below the explosion-proof valve 201, which is an inverted arrangement of the battery cell 20. At least a portion of the liquid-absorbing part 104 of the aforementioned heat insulation pad 10 is extended, so the extended portion can extend from between two adjacent battery cells 20. After assembly, the extended liquid-absorbing part 104 can extend downwards to the position of the cooling pipe 30. Specifically, Figure 3 As can be seen from the image, the first direction is downward, and the liquid absorption part 104 extends directly downward.

[0046] like Figure 3As shown, at least a portion of the first liquid-absorbing part 1041 extending downward from the liquid-absorbing part 104 can be located below the cooling pipe 30. In this way, once the high-temperature substance sprayed by the explosion-proof valve 201 of the thermally runaway cell 20 melts the cooling pipe 30, the coolant flowing downward from the cooling pipe 30 can come into contact with the liquid-absorbing part 104, be absorbed by the liquid-absorbing part 104, and continuously transferred to the liquid-absorbing heat insulation core 101. The liquid-absorbing heat insulation core 101 becomes a heat-insulating and cooling component that absorbs the coolant. This can enhance the cooling of the cell 20 by the liquid-absorbing heat insulation core 101, reduce the heat transfer from the thermally runaway cell 20 to adjacent cells 20, and help prevent the spread of thermal runaway.

[0047] Figure 3 The liquid-absorbing part 104 extends downwards, but its orientation is not limited to this. For example, the liquid-absorbing part 104 can also extend from the side of the battery cell 20 and continue downwards to below the cooling pipe 30. In short, it can extend from any side of the heat insulation pad 10, but ultimately it must be located below the cooling pipe 30. Obviously, the first direction is downwards, and the path of the liquid-absorbing part 104 extending to below the cooling pipe 30 is the shortest, which facilitates the rapid transfer of coolant to the liquid-absorbing heat insulation core 101.

[0048] For example, the material of the liquid-absorbing part 104 can be at least one of the following: cotton yarn, ceramic fiber, glass fiber, or plant fiber, where plant fiber is obviously a dry fiber. It is understood that the material of the liquid-absorbing part 104 has the characteristics of liquid absorption and non-flammability (fire resistance), meaning it can continuously transfer and transport coolant to the liquid-absorbing heat insulation pad 10 without burning out at high temperatures, thus not affecting the transfer of coolant. The specific principle can be compared to the wick of an alcohol lamp. The wick continuously absorbs alcohol, which burns, but the wick never burns out. The wick is generally made of cotton yarn, which has good liquid absorption properties. When the liquid-absorbing part 104 has a rope-like structure, to ensure the water absorption effect, the effective diameter of the cross-section of the rope-like structure of the liquid-absorbing part 104 can be set to be no less than 5 mm.

[0049] In some specific embodiments, the material of the liquid-absorbing heat insulation core 101 and the liquid-absorbing part 104 can be the same. In this case, the liquid-absorbing heat insulation core 101 and the liquid-absorbing part 104 can be processed into an integral structure. That is, when processing the liquid-absorbing heat insulation core 101, a portion of it extends out on one side to serve as the liquid-absorbing part 104, resulting in a simple structure. It is known that the mechanical properties of the liquid-absorbing heat insulation core 101 material should meet the requirements of absorbing the expansion force of the battery cell 20. Specifically, the material of the liquid-absorbing heat insulation core 101 can meet the following requirements: stress ≥ 0.4 MPa corresponding to 10% compression ratio of the liquid-absorbing heat insulation core 101, and thermal conductivity ≤ 0.04 W / (m·K). In terms of dimensions, the core material thickness of the liquid-absorbing heat insulation core 101 can be 2~5 mm.

[0050] In some specific embodiments, the materials of the liquid-absorbing heat insulation core 101 and the liquid-absorbing part 104 can be different. In this case, the liquid-absorbing part 104 includes a first liquid-absorbing part 1041 and a second liquid-absorbing part 1042. The first liquid-absorbing part 1041 extends out of the liquid-absorbing heat insulation core 101, and the second liquid-absorbing part 1042 is connected to the liquid-absorbing heat insulation core 101, specifically, for example, by bonding it to the liquid-absorbing heat insulation core 101. Of course, when the liquid-absorbing heat insulation core 101 and the liquid-absorbing part 104 are made of the same material, they can also be set separately and then bonded together.

[0051] like Figure 7 As shown, Figure 7 for Figure 2 A schematic diagram of the structure of the heat insulation pad 10.

[0052] When the materials of the liquid-absorbing part 104 and the liquid-absorbing heat insulation core 101 are different, it is more convenient to process them separately, and they can be processed separately and then connected together. The second liquid-absorbing part 1042 of the liquid-absorbing part 104 must maintain contact with the liquid-absorbing heat insulation core 101 so that the coolant absorbed by the first liquid-absorbing part 1041 can be transferred to the liquid-absorbing heat insulation core 101 in a timely manner. It can be understood that the second liquid-absorbing part 1042 of the liquid-absorbing part 104 and the liquid-absorbing heat insulation core 101 can maintain a large contact area. Figure 7 In this design, the second liquid-absorbing portion 1042 of the liquid-absorbing portion 104 has a reciprocating bending structure, similar to a serpentine structure. This allows the liquid-absorbing portion 104 to have more contact with the liquid-absorbing heat-insulating core 101. Furthermore, the upper part of the reciprocating bending second liquid-absorbing portion 1042 of the liquid-absorbing portion 104 can adhere to the upper part of the liquid-absorbing heat-insulating core 101, the lower part of the second liquid-absorbing portion 1042 can adhere to the lower part of the liquid-absorbing heat-insulating core 101, and the bending positions on the left and right sides of the second liquid-absorbing portion 1042 can adhere to the left and right sides of the liquid-absorbing heat-insulating core 101. In this way, the liquid-absorbing portion 104 can transfer the coolant to the liquid-absorbing heat-insulating core 101 as evenly as possible.

[0053] Figure 7 The liquid-absorbing heat insulation core 101 extends horizontally and bends back and forth. It can also extend vertically and bend back and forth, or extend in other directions and bend back and forth. In addition to bending back and forth, other arrangements are also possible. For example, the second liquid-absorbing part 1042 can also be arranged in a spiral shape. This embodiment does not impose specific limitations, as long as the absorbed coolant is transferred to the entire liquid-absorbing heat insulation core 101 as quickly and relatively evenly as possible.

[0054] Furthermore, when the heat insulation pad 10 is provided with an outer frame 102, the outer frame 102 may have a notch 102a, through which the liquid-absorbing part 104 can extend out of the liquid-absorbing heat insulation core 101. This prevents the outer frame 102 from interfering with the outward extension of the liquid-absorbing part 104, or in other words, prevents the outer frame 102 from squeezing the liquid-absorbing part 104, thus ensuring that the liquid-absorbing part 104 fully absorbs liquid and transfers it to the liquid-absorbing heat insulation core 101. It should be understood that although the separate arrangement described here is for liquid-absorbing heat insulation core 101 and liquid-absorbing part 104 made of different materials, this arrangement can be used even if both are made of the same material.

[0055] When the material used for the liquid-absorbing heat insulation core 101 is different from that used for the liquid-absorbing part 104, the material of the liquid-absorbing heat insulation core 101 can be, for example, aerogel. Aerogel has a good heat insulation effect and also has a certain liquid absorption capacity, which can better meet the needs of heat insulation and heat absorption and cooling.

[0056] Let's look again. Figure 8 , Figure 8 This is a schematic diagram of the structure of the heat insulation pad 10 in another embodiment of this application.

[0057] In this embodiment, a heat insulation pad 10 is provided with two liquid-absorbing parts 104, and one liquid-absorbing part 104 is attached to each side surface of the liquid-absorbing heat insulation core 101 in the thickness direction. It is understood that it is sufficient for one side surface of the liquid-absorbing heat insulation core 101 in the thickness direction to have a liquid-absorbing part 104 attached, or each side surface can have a liquid-absorbing part 104 attached, and each side surface can have at least one liquid-absorbing part 104. Obviously, the more liquid-absorbing parts 104 there are, the more and faster the liquid-absorbing parts 104 can transfer the absorbed coolant to the liquid-absorbing heat insulation core 101, similar to tree roots transporting coolant upwards. The specific number of liquid-absorbing parts 104 can be set according to actual needs.

[0058] Furthermore, when the material of the liquid-absorbing part 104 is different from that of the liquid-absorbing heat insulation core 101, the second liquid-absorbing part 1042 of the liquid-absorbing part 104 is not limited to being connected to the liquid-absorbing heat insulation core 101 by adhesive bonding, but can also be connected by other methods, such as being embedded in the liquid-absorbing heat insulation core 101. A groove can be pre-machined on the liquid-absorbing heat insulation core 101, and the liquid-absorbing part 104 can be embedded within it. In this way, the liquid-absorbing part 104 does not occupy space in the thickness direction of the heat insulation pad 10, which is beneficial for structural compactness. Moreover, since the liquid-absorbing part 104 is embedded within the liquid-absorbing heat insulation core 101, the contact between the liquid-absorbing part 104 and the liquid-absorbing heat insulation core 101 is more sufficient, which also facilitates better delivery of coolant from the liquid-absorbing part 104 to the liquid-absorbing heat insulation core 101.

[0059] You can continue to refer to this. Figure 3 , Figure 7 , Figure 8Understandably, in this embodiment, the liquid-absorbing portion 104 of the heat insulation pad 10 may include at least two liquid-absorbing branch segments 10411, and the at least two liquid-absorbing branch segments 10411 extend in opposite directions. The first liquid-absorbing portion 1041 of the aforementioned liquid-absorbing portion 104 includes the liquid-absorbing branch segments 10411. Specifically, the liquid-absorbing portion 104 in this embodiment includes two liquid-absorbing branch segments 10411, with each liquid-absorbing branch segment 10411 corresponding to a cooling pipe 30, and each liquid-absorbing branch segment 10411 extending in opposite directions. Figure 4 As shown, each battery cell 20 has two cooling pipes 30 distributed at its bottom. The two cooling pipes 30 are located on both sides of the explosion-proof valve 201. The extension direction of the liquid absorption branch section 10411 is parallel to the length direction of the heat insulation pad 10 (i.e., Figure 3 The length direction of the heat insulation pad 10 is perpendicular to the height direction (i.e., the vertical direction) and the thickness direction of the heat insulation pad 10, and the extension direction of the liquid absorption branch section 10411 is also perpendicular to the extension direction of the cooling pipe 30.

[0060] In this way, one liquid-absorbing branch segment 10411 is used to absorb the coolant flowing out of one cooling pipe 30, and another liquid-absorbing branch segment 10411 is used to absorb the coolant flowing out of another cooling pipe 30. This allows for faster and more efficient absorption of coolant to deliver it to the liquid-absorbing heat insulation core 101. It is understood that a single liquid-absorbing section 104 can also be divided into more liquid-absorbing branch segments 10411 to absorb even more coolant. Of course, this is not limited to absorbing more coolant by providing multiple liquid-absorbing branch segments 10411 within a single liquid-absorbing section 104; it can also be achieved by increasing the number of liquid-absorbing sections 104, for example, by distributing multiple liquid-absorbing sections 104 along the extension direction of the cooling pipe 30 to each heat insulation pad 10.

[0061] Can watch again Figure 9 , Figure 9 This is an exploded schematic diagram of the heat insulation pad 10 in another embodiment of this application.

[0062] and Figure 8 Compared to the thinner, rope-like liquid-absorbing branch segment 10411, it can be seen that... Figure 9 The dimension W of the liquid-absorbing branch segment 10411 along the thickness direction of the liquid-absorbing heat insulation core 101 is larger than that of the liquid-absorbing branch segment 10411 along the height direction (vertical direction) of the liquid-absorbing heat insulation core 101. This indicates that... Figure 9 The liquid-absorbing branch segment 10411 is a sheet-like liquid-absorbing branch segment 10411, extending along both the thickness and length directions of the liquid-absorbing heat insulation core 101. This structural form of the liquid-absorbing branch segment 10411 can receive more coolant flowing from the cooling pipe 30, thereby more fully delivering coolant to the liquid-absorbing heat insulation core 101. Of course, the aforementioned thinner liquid-absorbing branch segment 10411 is simpler to manufacture.

[0063] Furthermore, the liquid-absorbing portion 104 can not only be located below the cooling pipe 30, but can also contact the bottom of the cooling pipe 30 to absorb coolant more quickly. For example, the aforementioned liquid-absorbing branch section 10411 can be directly attached to the bottom of the cooling pipe 30. Of course, the liquid-absorbing portion 104 can also absorb coolant even if it is not attached to the cooling pipe 30, as long as it is located below the cooling pipe 30.

[0064] In addition, such as Figure 3 As shown, in this embodiment, the portion of the liquid-absorbing part 104 located below the cooling pipe 30, extending along the length of the heat insulation pad 10, is no greater than the width of the cooling pipe 30. The width direction of the cooling pipe 30 is... Figure 3 The Y-direction is shown in the diagram. As mentioned earlier, the explosion-proof valve 201 is located between the two cooling pipes 30. When the explosion-proof valve 201 is opened to release pressure, the high-temperature substance ejected mainly melts the part of the cooling pipe 30 near the explosion-proof valve 201. Therefore, the liquid suction part 104 does not need to be attached to the entire width of the cooling pipe 30. This can reduce the extension length of the liquid suction part 104 in the Y-direction, save materials, and ensure sufficient delivery of coolant.

[0065] 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, It includes a liquid-absorbing heat insulation core (101) and a liquid-absorbing part (104), the liquid-absorbing part (104) and the liquid-absorbing heat insulation core (101) are connected; the projection of the liquid-absorbing heat insulation core (101) along the thickness direction is such that at least a portion of the projection of the liquid-absorbing part (104) is outside the projection of the liquid-absorbing heat insulation core (101).

2. The heat insulation pad according to claim 1, characterized in that, The liquid absorption part (104) includes a first liquid absorption part (1041) and a second liquid absorption part (1042). The first liquid absorption part (1041) extends out of the liquid absorption heat insulation core (101), and the second liquid absorption part (1042) is connected to the liquid absorption heat insulation core (101).

3. The heat insulation pad according to claim 2, characterized in that, The second liquid-absorbing part (1042) has a reciprocating bending or spiral structure.

4. The heat insulation pad according to claim 2, characterized in that, The liquid absorption section (104) includes at least two liquid absorption branch segments (10411) extending along the length direction of the liquid absorption heat insulation core (101), wherein the length direction, height direction, and thickness direction of the liquid absorption heat insulation core (101) are perpendicular; and the extension directions of the at least two liquid absorption branch segments (10411) are opposite.

5. The heat insulation pad according to claim 4, characterized in that, The liquid-absorbing branch segment (10411) is a rope-like structure or a sheet-like structure. The dimension of the sheet-like structure along the thickness direction of the liquid-absorbing heat insulation core (101) is greater than the dimension of the sheet-like structure along the height direction of the liquid-absorbing heat insulation core (101).

6. The heat insulation pad according to claim 2, characterized in that, The heat insulation pad (10) also includes an outer frame (102), and the outer frame (102) is bonded to both sides of the liquid-absorbing heat insulation core (101) in the thickness direction; the second liquid-absorbing part (1042) is bonded to the liquid-absorbing heat insulation core (101), and the outer frame (102) is provided with a notch (102a), and the liquid-absorbing part (104) passes through the notch (102a) to extend out of the liquid-absorbing heat insulation core (101).

7. The heat insulation pad according to any one of claims 2-5, characterized in that, The first liquid-absorbing part (1041) and the second liquid-absorbing part (1042) are an integral structure, or the first liquid-absorbing part (1041) is bonded to the liquid-absorbing heat insulation core (101), or the first liquid-absorbing part (1041) is embedded in the liquid-absorbing heat insulation core (101).

8. The heat insulation pad according to any one of claims 1-6, characterized in that, The heat insulation pad (10) includes at least two of the liquid-absorbing portions (104).

9. The heat insulation pad according to claim 8, characterized in that, At least a portion of the liquid-absorbing portion (104) is distributed along the length direction of the liquid-absorbing heat insulation core (101); or, at least one of the liquid-absorbing portions (104) is distributed on either side surface of the liquid-absorbing heat insulation core (101) along its thickness direction.

10. The heat insulation pad according to any one of claims 1-6, characterized in that, The liquid absorption part (104) is made of one of the following materials: cotton yarn, ceramic fiber, glass fiber, or plant fiber.

11. The heat insulation pad according to claim 10, characterized in that, The liquid-absorbing heat insulation core (101) is made of the same material as the liquid-absorbing part (104); or, the liquid-absorbing heat insulation core (101) is made of a different material than the liquid-absorbing part (104), and the liquid-absorbing heat insulation core (101) is made of aerogel.

12. A battery pack, characterized in that, It includes a plurality of battery cells (20) and a cooling pipe (30) located below the battery cells (20), with a heat insulation pad (10) as described in any one of claims 1-11 disposed between adjacent battery cells (20), and a portion of the liquid absorption part (104) located below the cooling pipe (30).

13. The battery pack according to claim 12, characterized in that, Part of the liquid absorption section (104) is in contact with the bottom of the cooling pipe (30).

14. A vehicle, characterized in that, Includes the battery pack as described in claim 12 or 13.

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