Thermal insulation pad, power battery and automobile

Abstract

The application provides a heat insulation pad, a power battery and a car, and heat insulation of a thermal runaway battery cell can be realized at a relatively low cost. The heat insulation pad comprises a heat insulation body part, the heat insulation body part comprises a heat insulation shell, the heat insulation shell has an inner cavity, and the inner cavity is filled with a liquid; the heat insulation pad further comprises a partition part, and the heat insulation body part is provided with the partition part on both sides in the thickness direction of the heat insulation body part.

Description

Technical Field

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

[0002] A power battery consists of multiple cells, and cells may experience thermal runaway. If one cell experiences thermal runaway, it may affect adjacent cells, thereby posing a significant safety risk.

[0003] Therefore, related technical solutions will place heat insulation pads between adjacent cells. Heat insulation pads, such as aerogel heat insulation pads and nano heat insulation pads, are used to improve heat insulation capacity by using heat insulation pads with lower thermal conductivity. However, such heat insulation pads have high material costs and complex manufacturing processes. Summary of the Invention

[0004] The purpose of this application is to provide a heat insulation pad, a power battery, and an automobile that can achieve heat insulation for thermal runaway cells at a relatively low cost.

[0005] To solve the above-mentioned technical problems, this application provides a heat insulation pad, the heat insulation pad including a heat insulation body part, the heat insulation body part including a heat insulation shell, the heat insulation shell having an inner cavity filled with liquid; the heat insulation pad also includes partition parts, the partition parts being provided on both sides of the heat insulation body part along its thickness direction.

[0006] Optionally, the heat insulation shell is made of insulating plastic.

[0007] Optionally, the heat insulation shell is made of polycarbonate or polypropylene, or a composite material including polypropylene and glass fiber.

[0008] Optionally, the heat insulation shell includes a first side surface and a second side surface distributed opposite to each other, the first side surface and the second side surface being respectively oriented toward a corresponding battery cell;

[0009] The heat insulation body also includes a high-temperature resistant layer, the high-temperature resistant layer having a higher high-temperature resistant temperature than the heat insulation shell; the high-temperature resistant layer is attached to both the first side surface and the second side surface.

[0010] Optionally, the high-temperature resistant layer is made of ceramic composite material.

[0011] Optionally, the thickness of the high-temperature resistant layer is not less than 0.1 mm.

[0012] Optionally, the volume of the inner cavity is larger than the volume of the liquid.

[0013] This application also provides a power battery, which includes at least two cells and a heat insulation pad, wherein the heat insulation pad is any of the heat insulation pads described above.

[0014] The heat insulation pad is provided between two adjacent battery cells, the partition portion connects the battery cell and the heat insulation body portion, and the heat insulation body portion is provided at an interval between the battery cell and the partition portion.

[0015] Optionally, the partition is annular and is disposed around the periphery of the heat insulation body.

[0016] Optionally, the partition is elastic and is compressed between the heat insulation body and the battery cell.

[0017] Optionally, the distance between two adjacent battery cells is D1, and the thickness of the heat insulation pad at the position of the partition is D2, satisfying: D1≤D2≤3 / 2D1.

[0018] Optionally, the heat insulation housing includes a main body wall and a peripheral portion surrounding the outer periphery of the main body wall; the width of the peripheral portion is greater than the thickness of the main body wall; the partition portion is compressed between the peripheral portion and the battery cell.

[0019] Optionally, the spacing between two adjacent battery cells is D1, and the thickness of the heat insulation body is D3, where 1 / 3D1 ≤ D3. <D1。

[0020] This application also provides a vehicle including any of the power batteries described above.

[0021] The heat insulation pad in this application achieves its heat insulation purpose by filling the inner cavity of the heat insulation shell with liquid, which can absorb heat. At the same time, the heat insulation pad is provided with partitions on both sides, so when the heat insulation pad is located between two cells, it can be spaced apart from the cells, thus not affecting the heating effect of the cells when they need to be heated normally. Moreover, the cost is much lower than the aerogel heat insulation pads and nano heat insulation pads mentioned in the background art. That is, the heat insulation pad of this power battery has both the advantage of low cost and good heat absorption capacity.

[0022] The power battery provided in this application includes the aforementioned heat insulation pad, and the automobile provided includes the aforementioned power battery. Therefore, both the power battery and the automobile have the same technical effects as the aforementioned heat insulation pad. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a battery cell in one embodiment of this application;

[0024] Figure 2 For two adjacent Figure 1 A schematic diagram of the cell arrangement in the middle section;

[0025] Figure 3 This is a schematic diagram of a structure in this embodiment where a heat insulation pad is provided between two adjacent battery cells;

[0026] Figure 4 for Figure 3 A schematic diagram of the three-dimensional structure of the thermal insulation pad;

[0027] Figure 5 for Figure 4 Front view schematic diagram of the insulation body of the insulation pad;

[0028] Figure 6 for Figure 4 Cross-sectional view along the middle BB direction;

[0029] Figure 7 for Figure 6 A schematic diagram of the structure of the insulation shell of the central insulation body, wherein the insulation shell is filled with liquid;

[0030] Figure 8 for Figure 3 A magnified view of part A in the middle;

[0031] Figure 9 for Figure 3 A schematic diagram showing the expansion and deformation of the thermal insulation pad when thermal runaway occurs in the battery cell on the right side of the middle section;

[0032] Figure 10 for Figure 6 Enlarged schematic diagram of part C in the middle;

[0033] Figure 11 for Figure 4 Front view of the heat insulation pad;

[0034] Figure 12 for Figure 7 A schematic diagram of the structure where the insulation shell is not filled with liquid;

[0035] Figure 13 for Figure 12 A magnified view of part D in the middle.

[0036] The annotations in the attached figures are explained as follows:

[0037] 100-cell;

[0038] 101-Battery casing; 1011-First sidewall; 1012-Top wall; 1013-Second sidewall; 1014-Electrode;

[0039] 200-Insulation Pad;

[0040] 201-Insulation body; 2011-Insulation shell; 20111-Side wall; 20112-Top wall; 20113-Bottom wall; 2011a-Inner cavity; 2012-Liquid; 2013-High temperature resistant layer;

[0041] 202-Partition section. Detailed Implementation

[0042] 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.

[0043] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a power battery cell 100 in one embodiment of this application; Figure 2 For two adjacent Figure 1 A schematic diagram of the arrangement of the 100 cells in the battery.

[0044] The power battery in this embodiment includes multiple battery cells 100, meaning at least two. Specifically, the power battery may include one or more battery modules. Each battery module includes multiple battery cells 100. Each battery cell 100 includes a battery cell housing 101 and battery cell material located inside the battery cell housing 101. Figure 1 (not shown in the image), the battery casing 101 is provided with electrodes 1014. Figure 1 The two electrodes 1014 shown are the positive and negative electrodes, respectively. Electrodes 1014 are located at the top of the battery cell 100, but obviously, electrodes 1014 can also be located at the bottom or side; this embodiment does not limit this. The battery cell 100 commonly has the following shape... Figure 1 The cuboid structure shown includes two opposing first sidewalls 1011, two opposing second sidewalls 1013, a top wall 1012, and a bottom wall 1015. The top wall 1012 and the bottom wall 1015 are distributed vertically, with the top and bottom walls arranged vertically. Figure 1 From the perspective of the first sidewalls 1011, the surfaces of the two first sidewalls 1011 are the large surfaces of the cell 100, that is, the surfaces with the largest area.

[0045] When multiple battery cells 100 are arranged, they are arranged with their large surfaces facing each other, so that the multiple battery cells 100 can be arranged relatively compactly to save space, such as... Figure 2As shown. Thus, the first sidewall 1011 of the battery casing 101 becomes the main path for heat transfer between the cells 100. In order to reduce the safety risk caused by the transfer of heat from one cell 100 to an adjacent cell 100 in the event of thermal runaway, the power battery in this embodiment also includes a heat insulation pad 200.

[0046] like Figure 3 As shown, Figure 3 This is a schematic diagram of a structure in which a heat insulation pad 200 is provided between two adjacent battery cells 100 in this embodiment.

[0047] The heat insulation pad 200 is disposed between two adjacent battery cells 100, specifically between the first sidewall 1011 of one battery cell 100 and the first sidewall 1011 of another battery cell 100. Of course, the arrangement of the battery cells 100 in this embodiment is merely illustrative; the battery cells 100 can also be arranged in other ways, such as with their second sidewalls 1013 facing each other. In this case, the heat insulation pad 200 is located between the second sidewalls 1013 of one battery cell 100 and the second sidewall 1013 of another battery cell 100. Further details are omitted, as long as the heat insulation pad 200 is used to separate two adjacent battery cells 100. Moreover, the battery cell 100 is not limited to a cuboid; for example, it can be a cube, in which case multiple battery cells 100 can be arranged with any sidewalls facing each other.

[0048] For details on the structure of the heat insulation pad 200, please refer to [link / reference]. Figures 4 to 6 understand, Figure 4 for Figure 3 A three-dimensional structural diagram of the 200 heat insulation pad; Figure 5 for Figure 4 A front view schematic diagram of the heat insulation body 201 of the heat insulation pad 200; Figure 6 for Figure 4 Schematic sectional view along the middle BB direction.

[0049] The heat insulation pad 200 in this embodiment includes a heat insulation body 201 and a partition 200 as detailed below. The heat insulation body 201 will be described in detail first. The heat insulation body 201 includes a heat insulation shell 2011, which has an inner cavity 2011a filled with liquid 2012. Liquid 2012 can absorb heat to reduce the transfer of heat from an adjacent thermally runaway cell 100 to another adjacent cell 100, thus preventing the spread of thermal runaway. For this purpose, a liquid 2012 with a high specific heat capacity can be injected into the heat insulation shell 2011. Liquid 2012 can be, for example, battery coolant. Battery coolant includes inorganic substances such as calcium chloride, and organic substances such as methanol, ethanol, ethylene glycol, glycerol, and lubricating oil. The composition of battery coolant is prior art and will not be discussed further here. Of course, liquid 2012 can also be water, as long as it has a large heat absorption capacity. Specifically, to achieve better heat absorption, the specific heat capacity C of the liquid 2012 inside the insulation shell 2011 can be set to C≥2000J / (kg·K), which helps ensure that the liquid 2012 can absorb sufficient heat. Furthermore, the electrical conductivity σ of the liquid 2012 can be set to σ≤100µs / cm, ensuring insulation safety even if leakage occurs in the insulation shell 2011.

[0050] Therefore, the heat insulation pad 200 in this embodiment achieves heat insulation by filling the inner cavity 2011a of the heat insulation shell 2011 with liquid 2012, which absorbs heat. The manufacturing process is relatively simple, and the cost is far lower than that of aerogel heat insulation pads and nano heat insulation pads mentioned in the background art. Another type of heat insulation pad is the phase change heat insulation pad. However, phase change heat insulation pads have limited heat absorption capacity and are expensive. The heat insulation pad 200 in this embodiment has both the advantage of low cost and good heat absorption capacity.

[0051] Let's look again. Figure 7 , Figure 7 for Figure 6 A schematic diagram of the structure of the heat insulation shell 2011 of the heat insulation body 201, wherein the heat insulation shell 2011 contains liquid 2012.

[0052] In this embodiment, the volume of liquid 202 can be smaller than the volume of inner cavity 2011a. The definition of volume in this application is based on the condition that the heat insulation pad 200 is in a normal state and the liquid 202 has not absorbed heat from the thermally runaway battery cell 100. Figure 7From the perspective shown, the height of the liquid 2012 in the vertical direction is defined as L1, and the height of the inner cavity 2011a of the heat insulation shell 2011 is defined as L2. Since the volume of the liquid 2012 is relatively smaller than the volume of the inner cavity 2011a, in this embodiment, L1 < L2 can be limited. Thus, under normal conditions, that is, when the liquid 2012 has not absorbed the heat from the thermal runaway battery cell 100, a part of the inner cavity 2011a of the heat insulation shell 2011 is an empty cavity, that is, there is no liquid 2012 in this part of the empty cavity. With this configuration, when adjacent cells 100 expand and deform under certain operating conditions and squeeze the heat insulation shell 2011, the cavity can absorb the deformation. Even if the volume of the inner cavity 2011a of the heat insulation shell 2011 is compressed and reduced, the effect of the volume reduction on the liquid 2012 will be eliminated, thereby preventing the liquid 2012 from leaking after the volume of the inner cavity 2011a of the heat insulation shell 2011 is reduced. This helps to ensure that there is no risk of leakage throughout the entire life cycle of the heat insulation shell 2011.

[0053] More specifically, it can be defined as 1 / 3L2≤L1<L2. L1 is smaller than L2 on the one hand, but it cannot be too small on the other hand, because it is necessary to ensure that the amount of liquid 2012 in the limited space is sufficient to absorb heat for the purpose of insulation.

[0054] It is worth noting that in this embodiment, there is a gap between the heat insulation body 201 of the heat insulation pad 200 and the battery cell 100, that is, the heat insulation body 201 and the battery cell 100 are spaced apart. (See reference...) Figure 8 understand, Figure 8 for Figure 3 A magnified view of part A in the middle, please refer to it as well. Figure 2 understand.

[0055] The distance between two adjacent battery cells 100 is the first distance D1, and the thickness of the heat insulation body 201 is D3, where D3 > D1. Assuming that the two adjacent battery cells 100 are arranged along the first direction, the thickness D3 of the heat insulation body 201 is its dimension along the first direction. Figure 8 The first direction is the left-right direction. Thus, there is a second distance D4 between the heat insulation body 201 and the adjacent battery cell 100. For example, the heat insulation body 201 can be located in the middle of the gap between two adjacent battery cells 100, so D4 = (D3 - D1) / 2. Of course, the heat insulation body 201 does not necessarily have to be located in the middle; the second distance D4 between the heat insulation body 201 and any adjacent battery cell 100 can also be slightly different.

[0056] In other words, under normal conditions, the heat insulation body 201 of the heat insulation pad 200 does not contact the outer surface of any of the battery cells 100, but rather maintains a second distance D4. It is understood that power batteries need to operate within a certain temperature range. When the ambient temperature is high, the power battery needs to be cooled; when the ambient temperature is low, the power battery needs to be heated. Power batteries are generally equipped with flow channels, in which liquid media can flow. By controlling the temperature of the liquid media, the power battery can be heated or cooled. Improving the energy efficiency of power batteries at low ambient temperatures has always been a challenge. The inventors considered that if the heat insulation body 201 were in contact with the outer surface of the battery cell 100, when the system heats the battery cell 100 at low ambient temperatures, the relatively high specific heat capacity of the liquid 2012 in the heat insulation pad 200 would inevitably absorb a large portion of the heat. This would cause the heat originally used to heat the battery cell 100 to be consumed, further increasing the difficulty of maintaining the temperature of the battery cell 100. Therefore, in this embodiment, the heat insulation body 201 and the battery cell 100 are spaced apart under normal conditions. The normal operating state mentioned in this application refers to the state in which the battery cell 100 does not experience thermal runaway. The heat insulation pad 200 does not need to absorb the heat from thermal runaway, and the liquid 2012 inside it will not undergo significant state changes due to heat absorption. However, the liquid 2012 is not in a completely uniform ambient temperature during the normal operation of the battery cell 100, and the ambient temperature will also change to some extent.

[0057] Furthermore, the heat insulation shell 2011 in this embodiment is made of insulating plastic. Of course, the insulating plastic material must meet certain strength requirements to ensure the stability of the liquid 2012 within it. It is worth noting that the reason the heat insulation shell 2011 in this embodiment is made of insulating plastic is that this material has a certain degree of ductility at high temperatures; after the liquid 2012 absorbs heat, it can cause the heat insulation shell 2011 to expand and deform.

[0058] Please combine Figure 9 understand, Figure 9 for Figure 3 The diagram shows the expansion and deformation of the thermal insulation pad 200 when the battery cell 100 on the right side of the middle experiences thermal runaway, specifically, it expands to the right.

[0059] For safety reasons, the battery cell 100 can be equipped with an explosion-proof valve. In the event of thermal runaway in the battery cell 100, the explosion-proof valve can open to release the high-pressure gases and other substances generated within the battery cell 100 due to thermal runaway, thereby reducing the risk of explosion. Taking the thermal runaway of the right-side battery cell 100 as an example, the right-side battery cell 100 will discharge its internal gases and other substances through its explosion-proof valve. This results in the battery cell 100 being emptied or partially emptied. At this time, the liquid 2012 within the heat insulation pad 200 absorbs heat and expands, causing the entire heat insulation shell 2011 to expand. Since the left-side battery cell 100 is in a normal state, it restricts the expansion of the heat insulation shell 2011. Therefore, the heat insulation shell 2011 mainly expands towards the emptied, thermally runaway right-side battery cell 100. Figure 9 The diagram shows the approximate outline M of the heat insulation shell 2011 after expansion, facing the right side of the battery cell 100. The hollow arrow indicates the direction of expansion.

[0060] As can be seen, the heat insulation shell 2011 continues to press the right cell 100 to the right, further compressing the thermally runaway cell 100. The distance between the thermally runaway cell 100 and the left cell 100 can reach the fifth distance D5, where D5 > D1. This increases the distance between the left cell 100 and the right cell 100 that has experienced thermal runaway, thereby further increasing the heat transfer path. Combined with the heat absorption effect of the liquid 2012, the heat insulation pad 200 has a "double heat insulation" function, which can effectively insulate the thermally runaway cell 100.

[0061] In this embodiment, the insulating plastic material of the heat insulation shell 2011 can be, for example, PC (Polycarbonate) or PP (Polypropylene), or it can be a composite material including PP and glass fiber, which can be a combination of PP and glass fiber. Furthermore, the heat insulation shell 2011 in this embodiment can be an integral structure formed by injection molding or vacuum forming. Injection molding and vacuum forming are known processes. After the liquid 2012 is injected into the formed heat insulation shell 2011, the injection port for the liquid 2012 can be sealed to reliably seal the liquid 2012 within the inner cavity 2011a, improving the leak-proof effect.

[0062] Based on this, please continue to refer to Figure 10 , Figure 10 for Figure 6 Enlarged diagram of part C in the middle.

[0063] In this embodiment, the heat insulation body 201 of the heat insulation pad 200 includes a high-temperature resistant layer 2013 in addition to the heat insulation shell 2011. The heat insulation shell 2011 includes a first side surface and a second side surface distributed opposite to each other, and the first side surface and the second side surface are distributed along the thickness direction of the heat insulation shell 2011. Figure 10 The perspective refers to the left and right surfaces. The first and second side surfaces of the heat insulation shell 2011 face one of the two adjacent battery cells 100 respectively. Both the first and second side surfaces are covered with a high-temperature resistant layer 2013, and the high-temperature resistant temperature of the high-temperature resistant layer 2013 is higher than that of the heat insulation shell 2011. The high-temperature resistant temperature is the temperature at which the material will not melt; the higher the high-temperature resistant temperature, the stronger the high-temperature resistance.

[0064] As mentioned above, the heat insulation shell 2011 is made of insulating plastic material that can expand and deform to compress the thermally runaway battery cell 100. For general insulating plastic materials, the high temperature resistance of the heat insulation shell 2011 is limited. In order to further enhance the high temperature resistance of the heat insulation body 201, a high temperature resistant layer 2013 with stronger high temperature resistance can be attached to both sides of the heat insulation shell 2011 along the thickness direction to better balance high temperature resistance and expansion deformation, prevent the heat insulation shell 2011 from melting and causing liquid 2012 to leak during thermal runaway, and ensure the ability to expand and compress the thermally runaway battery cell 100. In detail, the high-temperature resistance of the heat insulation shell 2011 can be no less than 200℃, and the high-temperature resistance of the high-temperature layer 2013 can be set to be greater than 200℃. For example, the high-temperature layer 2013 can be made of ceramic composite material, which has a high-temperature resistance of no less than 1000℃. This significantly improves the high-temperature resistance of the heat insulation body 201, thus enabling it to cope with the thermal runaway of various types of battery cells 100. Of course, if the insulating plastic material can both deform and expand and has high high-temperature resistance, the high-temperature layer 2013 can be omitted. In this case, the heat insulation body 201 is the heat insulation shell 2011.

[0065] When the high-temperature resistant layer 2013 is made of ceramic composite material, its thickness can be set to be no less than 0.1mm to ensure its high-temperature resistance. Of course, depending on the material of the high-temperature resistant layer 2013 and the spacing parameters between the battery cells 100, the thickness of the high-temperature resistant layer 2013 can also be adjusted according to actual needs.

[0066] Please continue to combine Figure 3 and Figure 4 and combined Figure 11 understand, Figure 11 for Figure 4 Front view of the heat insulation pad 200.

[0067] The heat insulation pad 200 in this embodiment further includes a partition portion 202. The partition portion 202 is specifically annular. The partition portion 202 is provided on both sides of the heat insulation body portion 201 in its thickness direction. The two sides of the heat insulation body portion 201 in the thickness direction are the two sides facing the battery cell 100, so the partition portion 202 is located on the side of the heat insulation body portion 201 facing the battery cell 100. The partition portion 202 in this embodiment can be provided around the circumferential portion 20112 of the heat insulation body portion 201. The circumferential portion 20122 is the four sides of the heat insulation body portion 201, so the partition portion 202 is an annular frame structure. Since the heat insulation body portion 201 in this embodiment is square, the square can be a rectangle or a square, and the partition portion 202 is correspondingly a square return frame structure. The partition portion 202 is used to connect the battery cell 100 and the heat insulation body portion 201. As Figure 8 shown, the partition portion 202 can position the heat insulation pad 200 between two adjacent battery cells 100, and can also ensure that the heat insulation pad 200 and the two adjacent battery cells 100 are spaced apart. That is, the heat insulation body portion 201 is specifically spaced apart from the battery cell 100 through the partition portion 202.

[0068] Define the thickness of the heat insulation body portion 201 as D3. As mentioned above, there is a first spacing D1 (the spacing in the normal state) between adjacent battery cells 100, then it satisfies: 1 / 3D1 ≤ D3 < D1. To achieve this, D1 needs to be less than D3 so that a fourth spacing D4 is generated between the heat insulation body portion 201 and the battery cell 100. However, D1 should not be too small to avoid affecting the heat insulation body portion 201 from expanding and pressing against the out-of-control battery cell 100 when the adjacent battery cells 100 are out of control. Therefore, it can be further limited that 1 / 3D1 ≤ D3.

[0069] In addition, the partition portion 202 in this embodiment can have a certain compressibility, such as an elastic rubber strip, etc. This can improve the reliability of the connection. The partition portion 202 can be adhered to the surfaces of the heat insulation body portion 201 and the battery cell 100. As Figure 8 shown, the thickness of the heat insulation pad 200 at the position of the partition portion 202 is D2 (the thickness in the uncompressed state), then it can satisfy D1 ≤ D2 ≤ 3 / 2D1. Because the thickness of the partition portion 202 itself should not be too large to avoid being difficult to compress between the battery cell 100 and the heat insulation body portion 201. As long as there is a certain amount of compression, the heat insulation body portion 201 can be pressed tightly between two adjacent battery cells 100. In this way, after multiple battery cells 100 are assembled, the partition portion 202 can also provide a pre-tightening force to the battery cells 100.

[0070] Please continue to refer to Figure 12 and Figure 13 , Figure 12 For Figure 7 the schematic structural diagram of the heat insulation housing 2011 in which the liquid 2012 is not filled; Figure 13 For Figure 12A magnified view of part D in the middle.

[0071] In this embodiment, the heat insulation shell 2011 includes a main wall portion 20111 and a peripheral portion 20112. The peripheral portion 20112 surrounds the outer periphery of the main wall portion 20111, and the peripheral portion 20112 and the main wall portion 20111 together enclose and define an inner cavity 2011a. As mentioned above, defining the direction in which two adjacent battery cells 100 are arranged as the first direction, the heat insulation shell 2011 includes two main wall portions 20111 disposed opposite to each other along the first direction. The main wall portions 20111 correspond to the inner cavity 2011a. Due to the existence of the inner cavity 2011a, the thickness T1 of the main wall portion 20111 is necessarily less than the thickness T2 of the peripheral portion 20112. The thickness T2 of the peripheral portion 20112 is also the thickness of the heat insulation shell 2011 in the first direction. In addition, the width W1 of the peripheral portion 20112 can also be set to be greater than the thickness T1 of the main wall portion 20111. The width W1 of the periphery 20112 is defined with the inner cavity 2011 as the reference, with the direction closer to the inner cavity 2011 being inward and the opposite being outward. Therefore, the width W1 of the periphery 20112 is the dimension extending along its inward and outward directions. Figure 13 The width W1 of the upper end of the periphery 20112 of the central insulation shell 2011 is the dimension in the vertical direction.

[0072] Combination Figure 8 Understood, the width dimension of the perimeter 20112 is also a dimension that matches the partition 202, and can be combined with... Figure 11 It is understood that, when projected along the first direction in which adjacent cells 100 are arranged, the projection of the partition portion 202 and the projection of the peripheral portion 20112 may coincide, or the projection of the partition portion 202 may fall within the projection range of the peripheral portion 20112. Figure 11 The diagram illustrates the thickness W2 of the partition portion 202. The width W1 of the perimeter portion 20112 can be understood similarly; the widths W1 and W2 can be equal, or W1 can be slightly larger than W2. When the partition portion 202 connects the heat insulation body portion 201 and the battery cell 100, the partition portion 202 is pressed between the battery cell 100 and the perimeter portion 20112 of the heat insulation body portion 201. Setting both the width W1 and the thickness T2 of the perimeter portion 20112 to be relatively large increases the strength of the mating position between the heat insulation body portion 201 and the partition portion 202, enabling positioning through pressing and engagement with the partition portion 202 and improving the pre-tightening effect on the battery cell 100.

[0073] It is understandable that when the high-temperature resistant layer 2013 is provided, the partition 202 directly presses against the periphery of the high-temperature resistant layer 2013 and indirectly presses against the periphery 20112 of the heat insulation shell 2011. Of course, if the high-temperature resistant layer 2013 is not provided, the partition 202 can directly press against the periphery 20112.

[0074] For example, in this embodiment, the width W1 of the periphery 20112 of the heat insulation shell 2011 can be set to 3mm ≤ W1 ≤ 12mm, and the thickness T1 of the main body wall 20111 of the heat insulation shell 2011 can be set to 0.1mm ≤ T1 ≤ 0.5mm. It can be seen that the difference between the width H1 and the thickness T1 is significant; the width W1 can be more than ten times the thickness T1, while the thickness T1 only needs to meet the strength requirements for encapsulating the liquid 2012. Therefore, the specific dimensions can also be adjusted according to requirements.

[0075] This application also provides a vehicle that includes the power battery described in the above embodiments, for example, disposed below the floor of the vehicle. Since the vehicle has the aforementioned power battery, it also possesses the same technical effects as the power battery described above, which will not be elaborated further.

[0076] 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 heat insulation pad, characterized in that, The heat insulation pad (200) includes a heat insulation body part (201), which includes a heat insulation shell (2011) and an inner cavity (2011a) filled with liquid (2012). The heat insulation pad (200) also includes a partition part (202), which is provided on both sides of the heat insulation body part (201) along its thickness direction.

2. The heat insulation pad according to claim 1, characterized in that, The heat insulation shell (2011) is made of insulating plastic.

3. The heat insulation pad according to claim 2, characterized in that, The heat insulation shell (2011) is made of polycarbonate or polypropylene, or a composite material including polypropylene and glass fiber.

4. The heat insulation pad according to claim 2, characterized in that, The heat insulation housing (2011) includes a first side surface and a second side surface that are distributed opposite to each other, and the first side surface and the second side surface are respectively used to face a corresponding battery cell (100). The heat insulation body (201) further includes a high temperature resistant layer (2013), the high temperature resistant layer (2013) having a higher high temperature resistant temperature than the heat insulation shell (2011); the high temperature resistant layer (2013) is attached to both the first side surface and the second side surface.

5. The heat insulation pad according to claim 4, characterized in that, The high-temperature resistant layer (2013) is made of ceramic composite material.

6. The heat insulation pad according to claim 5, characterized in that, The thickness of the high-temperature resistant layer (2013) is not less than 0.1 mm.

7. The heat insulation pad according to any one of claims 1-6, characterized in that, The volume of the inner cavity (2011a) is greater than the volume of the liquid (2012).

8. A power battery, characterized in that, The power battery includes at least two cells (100) and a heat insulation pad (200), wherein the heat insulation pad (200) is the heat insulation pad (200) as described in any one of claims 1-7. The heat insulation pad (200) is provided between two adjacent battery cells (100), the partition (202) connects the battery cell (100) and the heat insulation body (201), and the heat insulation body (201) is provided at intervals with the battery cell (100) through the partition (202).

9. The power battery according to claim 8, characterized in that, The partition (202) is annular and is arranged around the periphery of the heat insulation body (201).

10. The power battery according to claim 9, characterized in that, The partition (202) is elastic and is compressed between the heat insulation body (201) and the battery cell (100).

11. The power battery according to claim 8, characterized in that, The distance between two adjacent cells (100) is D1, and the thickness of the heat insulation pad (200) at the position of the partition (202) is D2, satisfying: D1≤D2≤3 / 2D1.

12. The power battery according to claim 8, characterized in that, The heat insulation housing (2011) includes a main wall portion (20111) and a peripheral portion (20112) surrounding the outer periphery of the main wall portion (20111); the width of the peripheral portion (20112) is greater than the thickness of the main wall portion (20111); the partition portion (202) is compressed between the peripheral portion (20112) and the battery cell (100).

13. The power battery according to any one of claims 8-12, characterized in that, The distance between two adjacent battery cells (100) is D1, and the thickness of the heat insulation body (201) is D3, where 1 / 3D1≤D3 <D1。 14. A car, characterized in that, Includes the power battery as described in any one of claims 8-13.

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