Cooling device, battery assembly and electric equipment

Abstract

The utility model discloses a cooling device, a battery assembly and electric equipment. The cooling device comprises a packaging body; the heat insulation assembly is arranged in the packaging body, an enhancement area and a heat absorption area are arranged in the heat insulation assembly, the enhancement area is provided with a first supporting piece, and the heat absorption area is provided with a first phase change heat absorption piece. Therefore, the heat insulation assembly is internally provided with the enhancement area and the heat absorption area, the enhancement area is provided with the first supporting piece, and the heat absorption area is provided with the first phase change heat absorption piece, so that the heat absorption area can absorb heat and cool when the battery cell is heated, and the enhancement area can play a role in supporting and limiting when the battery cell is in thermal runaway; therefore, the supporting capacity of the cooling device can be improved while the heat absorption capacity of the cooling device is guaranteed, and the working performance of the cooling device can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cooling device, a battery assembly and electrical equipment. Background Art

[0002] Temperature is an important parameter that affects the performance of the battery cell. The increase in the temperature of the battery cell during operation will affect the battery cell capacity, cycle and other performance. In the case of overcharging, extrusion or puncture, the battery cell temperature will rise sharply, resulting in thermal runaway of the battery cell, causing fire or explosion. In order to ensure the working performance of the battery cell and avoid thermal runaway of the battery cell, a heat absorption component is set in the module.

[0003] In the related art, when a battery cell thermally runs away, although the heat absorption component can absorb heat and expand, the battery cell will expand and deform, and the battery cell will squeeze the heat absorption component, causing the thermal runaway battery cell to be close to the adjacent thermal runaway battery cell, thereby causing heat diffusion. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a cooling device, which has not only heat absorption capability but also support capability and better working performance.

[0005] Another object of the present invention is to provide a battery assembly.

[0006] Another purpose of the utility model is to provide an electrical device.

[0007] According to the cooling device of the embodiment of the utility model, it includes: a packaging body; a heat insulation component, wherein the heat insulation component is arranged in the packaging body, and a reinforcement area and a heat absorption area are arranged in the heat insulation component, the reinforcement area is provided with a first support member, and the heat absorption zone is provided with a first phase change heat absorption member.

[0008] Therefore, by providing a reinforcement zone and a heat absorption zone in the thermal insulation component, the reinforcement zone is provided with a first support member, and the heat absorption zone is provided with a first phase change heat absorption member, the heat absorption zone can absorb heat and cool when the battery cell is heated up, and the reinforcement zone can play a supporting and limiting role when the battery cell has thermal runaway, thereby ensuring the heat absorption capacity of the cooling device while improving the supporting capacity of the cooling device, thereby improving the working performance of the cooling device.

[0009] In some examples of the present invention, a second phase change heat absorption component is also provided in the reinforcement zone.

[0010] In some examples of the present invention, a second support member is further provided in the heat absorption zone, the volume fraction of the first support member in the enhancement zone is K1, the volume fraction of the second support member in the heat absorption zone is K2, and K1 and K2 satisfy the relationship: K1>K2.

[0011] In some examples of the present invention, K1 and K2 satisfy the relationship: 10%≤K1≤100%, 0≤K2≤20%.

[0012] In some examples of the present invention, the porosity of the first support member in the reinforcement zone is K3, the porosity of the second support member (222) in the heat absorption zone is K4, and K3 and K4 satisfy the relationship: K3≤K4, and / or K4-K3≥1%.

[0013] In some examples of the present invention, K3 and K4 satisfy the relationship: 0≤K3≤90%, 80%≤K4≤100%.

[0014] In some examples of the present invention, the volume fraction of the second phase-change heat absorption component in the enhanced region is K5, the volume fraction of the first phase-change heat absorption component in the heat absorption region is K6, and K3, K4, K5 and K6 satisfy the relationship: K6-K5≥1% and K5≤K3, K6≤K4.

[0015] In some examples of the present invention, at least one of the first support member and the second support member is made of fiber material.

[0016] In some examples of the present invention, at least one of the first phase-change heat absorption component and the second phase-change heat absorption component is a hydrogel.

[0017] In some examples of the present invention, the thickness of the thermal insulation component is L1, the thickness of the reinforcement zone (21) is L2, and L1 and L2 satisfy the relationship: 0.9≤L2 / L1≤1.

[0018] In some examples of the present invention, the center of a side surface of the reinforcement area close to the battery cell corresponds to the center of a side surface of the cooling device close to the battery cell.

[0019] In some examples of the present invention, there is one reinforcement area, and the reinforcement area is in an X-shape; and / or the reinforcement area is in an elliptical shape; and / or the reinforcement area is in a long strip shape.

[0020] In some examples of the present invention, the reinforcement area is annular and there are multiple of them, and the multiple reinforcement areas are concentrically arranged and spaced apart from each other in the radial direction.

[0021] In some examples of the present invention, the reinforcement area is block-shaped or spherical, there are multiple reinforcement areas, and the multiple reinforcement areas are arranged at intervals in the thermal insulation component.

[0022] In some examples of the present invention, the packaging body includes a first packaging film and a second packaging film, the circumferential edges of the first packaging film and the second packaging film are connected by heat compression, and the circumferential edge of the packaging body is at least partially provided with a weak portion.

[0023] The battery assembly according to the embodiment of the utility model comprises: a battery cell, wherein the battery cell is multiple; and the cooling device mentioned above, wherein the cooling device is arranged between two adjacent battery cells.

[0024] In some examples of the present invention, the opposite sides of two adjacent battery cells are set as the large surface of the battery cell, and the center of the reinforcement area corresponds to the center of the large surface of the battery cell.

[0025] The electric device according to the embodiment of the utility model includes: the battery assembly described above.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a partial schematic diagram of a battery assembly according to an embodiment of the utility model when thermal runaway does not occur;

[0029] Figure 2 It is a partial schematic diagram of a battery assembly according to an embodiment of the utility model when thermal runaway occurs;

[0030] Figure 3 is a partial schematic diagram of a battery assembly according to another embodiment of the utility model when thermal runaway does not occur;

[0031] Figure 4 is a partial schematic diagram of a battery assembly according to another embodiment of the utility model when thermal runaway occurs;

[0032] Figure 5 is a schematic diagram of a cooling device according to an embodiment of the utility model;

[0033] Figure 6 is a schematic diagram of a cooling device according to an embodiment of the utility model from another perspective;

[0034] Figure 7is a cross-sectional view of a heat insulation assembly according to an embodiment of the utility model;

[0035] Figure 8 is a cross-sectional view of a thermal insulation assembly according to another embodiment of the utility model;

[0036] Fig. 9 is a schematic diagram of a heat insulation assembly according to an embodiment of the utility model;

[0037] Fig.10 is a schematic diagram of a heat insulation assembly according to another embodiment of the utility model;

[0038] Fig.11 is a schematic diagram of a heat insulation assembly according to another embodiment of the utility model;

[0039] Fig.12 is a schematic diagram of a heat insulation assembly according to another embodiment of the utility model;

[0040] Fig.13 is a schematic diagram of a heat insulation assembly according to another embodiment of the utility model;

[0041] Fig.14 It is a schematic diagram of a heat insulation assembly according to another embodiment of the utility model.

[0042] Reference numerals:

[0043] 1000. Battery assembly;

[0044] 100. Cooling device;

[0045] 10. packaging body; 11. first packaging film; 12. second packaging film; 13. weak part;

[0046] 20. Thermal insulation components;

[0047] 21. reinforcement area; 211. first support member; 212. second phase change heat absorbing member;

[0048] 22. heat absorption zone; 221. first phase change heat absorption element; 222. second support element;

[0049] 200, battery cell; 201, large surface of battery cell. DETAILED DESCRIPTION

[0050] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0051] Reference below Figure 1-Figure 14 A cooling device 100 according to an embodiment of the present invention is described. The cooling device 100 can be applied to a battery assembly 1000 , and the battery assembly 1000 can be applied to an electrical device.

[0052] Combination Figure 1-Figure 8 As shown, the cooling device 100 according to the present invention can mainly include: a packaging body 10 and a heat insulation component 20. The heat insulation component 20 is arranged in the packaging body 10, and a reinforcement area 21 and a heat absorption area 22 are arranged in the heat insulation component 20, the reinforcement area 21 is provided with a first support member 211, and the heat absorption area 22 is provided with a first phase change heat absorption member 221.

[0053] Specifically, the cooling device 100 is used to be arranged between the large cell surfaces 201 of two adjacent battery cells 200 of the battery assembly 1000, and is used to absorb heat and cool the battery cells 200, thereby ensuring the working performance of the battery cells 200 and ensuring the normal operation of the battery assembly 1000.

[0054] By making the cooling device 100 include the heat absorption area 22, and arranging the first phase change heat absorption member 221 in the heat absorption area 22, when the battery cell 200 heats up, the first phase change heat absorption member 221 can absorb heat through phase change, thereby achieving heat absorption cooling of the battery cell 200 and ensuring the working performance of the battery cell 200. It should be noted that the battery cell 200 will heat up during normal operation and when thermal runaway occurs.

[0055] The first phase-change heat-absorbing component 221 may be a hydrogel, more than 90% of which is water, and the water inside the hydrogel will be vaporized and discharged when the temperature reaches about 120 degrees. In addition, in other embodiments, the first phase-change heat-absorbing component 221 may also be a solid phase-change material, such as paraffin or other substances.

[0056] Considering that the first phase-change heat absorption member 221 has a relatively low strength and needs to be packaged and shaped, a packaging body 10 may be provided so that the cooling device 100 can be supported between the battery cells 200 to prevent the first phase-change heat absorption member 221 from being damaged by the expansion force between the battery cells 200, thereby ensuring the normal operation of the first phase-change heat absorption member 221 and even the cooling device 100.

[0057] Furthermore, considering that the battery cell 200 will expand and deform when thermal runaway occurs, if the thermal insulation assembly 20 only includes the first phase change heat absorption component 221, after the first phase change heat absorption component 221 changes phase, the thermal runaway battery cell 200 may be close to the adjacent thermal runaway battery cell 200, resulting in heat diffusion, and the positions where the battery cell 200 expands and deforms are unevenly distributed.

[0058] By further providing a reinforcement zone 21 in the thermal insulation component 20 and providing a first support member 211 in the reinforcement zone 21, a non-uniform design of the thermal insulation component 20 can be achieved. Under the premise of ensuring that the heat absorption zone 22 can cool the battery cell 200 and the cooling capacity of the cooling device 100 is ensured, even if the battery cell 200 has thermal runaway and the thermal runaway battery cell 200 expands and deforms, the first support member 211 in the reinforcement zone 21 can also support and limit the battery cell 200 to be between the thermal runaway battery cell 200 and the adjacent non-thermal runaway battery cell 200, thereby preventing the non-thermal runaway battery cell 200 from being close to the thermal runaway battery cell 200, and ensuring that the non-thermal runaway battery cell 200 has a certain distance from the thermal runaway battery cell 200, thereby avoiding heat diffusion, and further improving the working performance of the cooling device 100 and the reliability of the battery assembly 1000.

[0059] Therefore, by providing the reinforcement area 21 and the heat absorption area 22 in the thermal insulation component 20, the reinforcement area 21 is provided with the first support member 211, and the heat absorption area 22 is provided with the first phase change heat absorption member 221, so that the heat absorption area 22 can absorb heat and cool when the battery cell 200 is heated up, and the reinforcement area 21 can play a supporting and limiting role when the battery cell 200 is thermally runaway, so that the heat absorption capacity of the cooling device 100 is guaranteed while the supporting capacity of the cooling device 100 is improved, and the working performance of the cooling device 100 can be improved.

[0060] Combination Figure 1-Figure 4 as well as Figure 7 and Figure 8 As shown, a second phase-change heat absorbing member 212 is further provided in the enhanced region 21. Specifically, by further providing the second phase-change heat absorbing member 212 in the enhanced region 21, the enhanced region 21 can also have phase-change heat absorbing capability, thereby improving the heat absorbing capability of the cooling device 100. It should be noted that the volume fraction of the first phase-change heat absorbing member 221 in the heat absorbing region 22 can be greater than the volume fraction of the second phase-change heat absorbing member 212 in the enhanced region 21, thereby ensuring that the heat absorbing capability of the heat absorbing region 22 is higher.

[0061] Optionally, the first phase-change heat absorbing member 221 and the second phase-change heat absorbing member 212 may be arranged in the same manner, which may facilitate the production of the heat insulation assembly 20 and even the cooling device 100 .

[0062] In some embodiments of the present invention, Figure 3 , Figure 4 as well as Figure 8 As shown, a second support member 222 is further provided in the heat absorption zone 22, the volume fraction of the first support member 211 in the enhancement zone 21 is K1, the volume fraction of the second support member 222 in the heat absorption zone 22 is K2, and K1 and K2 satisfy the relationship: K1>K2.

[0063] Specifically, by also providing a second support member 222 in the heat absorption zone 22, the support capacity of the heat absorption zone 22 can be improved. When the battery cell 200 has thermal runaway, the second support member 222 in the heat absorption zone 22 can also support and limit the battery cell 200 in thermal runaway state and the adjacent battery cell 200 not in thermal runaway state, thereby preventing the battery cell 200 not in thermal runaway state from being close to the battery cell 200 in thermal runaway state, and making the battery cell 200 not in thermal runaway state have a certain distance from the battery cell 200 in thermal runaway state, thereby avoiding heat diffusion, and further improving the working performance of the cooling device 100 and the reliability of the battery assembly 1000.

[0064] Furthermore, by setting the volume fraction of the first support member 211 in the enhanced area 21 to be greater than the volume fraction of the second support member 222 in the heat absorption area 22, it can be ensured that the supporting force of the enhanced area 21 is stronger than the supporting force of the heat absorption area 22, that is, it can be ensured that the enhanced area 21 mainly plays a supporting role, and the heat absorption area 22 mainly plays a heat absorption role, thereby ensuring the normal operation of the cooling device 100. Preferably, K1 and K2 can satisfy the relationship: K1-K2≥1%, thereby further ensuring the partition setting of the cooling device 100 and improving the reliability of the cooling device 100.

[0065] Furthermore, K1 and K2 satisfy the relationship: 10%≤K1≤100%, 0≤K2≤20%.

[0066] Specifically, under the premise of ensuring that the volume fraction of the first support member 211 in the reinforcement zone 21 is greater than the volume fraction of the second support member 222 in the heat absorption zone 22, the volume fraction of the first support member 211 in the reinforcement zone 21 is set within a reasonable range, and the volume fraction of the second support member 222 in the heat absorption zone 22 is set within a reasonable range. This can further enhance the supporting effect of the reinforcement zone 21 and the heat absorption effect of the heat absorption zone 22, thereby improving the working performance of the cooling device 100.

[0067] It should be noted that when K1=100%, that is, the enhanced area 21 is entirely composed of the first support member 211 and no second phase-change heat absorbing member 212. When K2=0, that is, the heat absorbing area 22 is entirely composed of the first phase-change heat absorbing member 221 and no second support member 222.

[0068] In some examples of the present invention, the porosity of the first support member 211 in the reinforcement zone 21 is K3, the porosity of the second support member 222 in the heat absorption zone 22 is K4, and K3 and K4 satisfy the relationship: K4-K3≥1%, and / or K3≤K4.

[0069] Specifically, the pores of the first support member 211 in the enhanced region 21 can be used to set the second phase-change heat absorbing member 212. The porosity of the first support member 211 in the enhanced region 21 refers to the percentage of the volume of the pores in the first support member 211 to the total volume of the enhanced region 21. The lower the porosity of the first support member 211 in the enhanced region 21, the smaller the volume used to set the second phase-change heat absorbing member 212, and the stronger the supporting role of the first support member 211. Therefore, K3 is required to be less than or equal to K4 to ensure the role of the first support member 211 in the enhanced region 21. In addition, the sum of the porosity of the first support member 211 in the enhanced region 21 and the volume fraction of the first support member 211 in the enhanced region 21 is 1.

[0070] The pores of the second support member 222 in the heat absorption zone 22 can be used to set the first phase-change heat absorption member 221. The porosity of the second support member 222 in the heat absorption zone 22 refers to the percentage of the volume of the pores in the second support member 222 to the total volume of the second support member 222. The higher the porosity of the second support member 222 in the heat absorption zone 22, the larger the volume used to set the first phase-change heat absorption member 221, and the better the heat absorption effect. In addition, the sum of the porosity of the second support member 222 in the heat absorption zone 22 and the volume fraction of the second support member 222 in the heat absorption zone 22 is 1.

[0071] By setting the porosity of the second support member 222 in the heat absorption zone 22 to be greater than the porosity of the first support member 211 in the reinforcement zone 21, and further setting the difference between the porosity of the second support member 222 in the heat absorption zone 22 and the porosity of the first support member 211 in the reinforcement zone 21 to be no less than 1%, the zoning setting of the cooling device 100 can be further guaranteed, and the reinforcement zone 21 can mainly play a supporting role, and the heat absorption zone 22 can mainly play a heat absorption role, thereby ensuring the normal operation of the cooling device 100.

[0072] Furthermore, K3 and K4 satisfy the relationship: 0≤K3≤90%, 80%≤K4≤100%.

[0073] Specifically, by setting the porosity of the first support member 211 in the reinforcement zone 21 within a reasonable range, and setting the porosity of the second support member 222 in the heat absorption zone 22 within a reasonable range, the supporting effect of the reinforcement zone 21 can be further enhanced, and the heat absorption effect of the heat absorption zone 22 can be enhanced, thereby improving the working performance of the cooling device 100.

[0074] It should be noted that when K3=0, that is, there are no pores in the reinforcement zone 21, there is no second phase change heat absorption member 212 in the reinforcement zone 21, and all are first support members 211. When K4=100%, that is, all are pores in the heat absorption zone 22, there is no second support member 222 in the heat absorption zone 22, and all are first phase change heat absorption members 221.

[0075] In some examples of the present invention, the volume fraction of the second phase change heat absorption component 212 in the enhanced region 21 is K5, the volume fraction of the first phase change heat absorption component 221 in the heat absorption region 22 is K6, and K3, K4, K5 and K6 satisfy the relationship: K6-K5≥1% and K5≤K3, K6≤K4.

[0076] Specifically, by setting the difference between the volume fraction of the first phase change heat absorption component 221 in the heat absorption zone 22 and the volume fraction of the second phase change heat absorption component 212 in the reinforcement zone 21 to be no less than 1%, it can be ensured that the volume of the first phase change heat absorption component 221 in the heat absorption zone 22 is larger, and the volume of the second phase change heat absorption component 212 in the reinforcement zone 21 is smaller, thereby further ensuring that the heat absorption zone 22 mainly plays a role of absorbing heat, and the reinforcement zone 21 mainly plays a role of supporting and limiting.

[0077] Further, the second phase-change heat absorbing member 212 is disposed in the pores of the first support member 211 in the enhanced region 21, and the volume fraction of the second phase-change heat absorbing member 212 in the enhanced region 21 is set to be no greater than the porosity of the first support member 211 in the enhanced region 21, that is, the second phase-change heat absorbing member 212 can fill all the pores of the first support member 211 in the enhanced region 21, the second phase-change heat absorbing member 212 can also partially fill the pores of the first support member 211 in the enhanced region 21, or the second phase-change heat absorbing member 212 is not disposed in the enhanced region 21. Optionally, K5 can satisfy the relationship: 0≤K5≤100%.

[0078] Furthermore, the first phase-change heat absorbing member 221 is disposed in the pores of the second support member 222 in the heat absorbing region 22, and the volume fraction of the first phase-change heat absorbing member 221 in the heat absorbing region 22 is set to be no greater than the porosity of the second support member 222 in the heat absorbing region 22, that is, the second phase-change heat absorbing member 212 can completely fill the pores of the second support member 222 in the heat absorbing region 22, and the second phase-change heat absorbing member 212 can also partially fill the pores of the second support member 222 in the heat absorbing region 22. Optionally, K6 can satisfy the relationship: 0≤K6≤90%.

[0079] In some embodiments of the present invention, Figure 1-Figure 4 as well as Figure 7 and Figure 8 As shown, at least one of the first support member 211 and the second support member 222 is made of fiber material.

[0080] Specifically, the first support member 211 can be set to a fiber material, and the fiber material is randomly arranged and entangled in the reinforcement area 21, which can optimize the mechanical properties of the reinforcement area 21 and effectively improve the supporting force of the reinforcement area 21. In addition, the fiber material not only has good mechanical properties, but is also easy to obtain and has a low cost, which can reduce the production and manufacturing costs of the first support member 211 and even the cooling device 100.

[0081] Furthermore, the second support member 222 may be configured as a fiber material, which is randomly arranged and entangled in the heat absorption zone 22, so that the mechanical properties of the heat absorption zone 22 can be optimized and the supporting force of the heat absorption zone 22 can be effectively improved. Furthermore, the fiber material not only has good mechanical properties, but is also easy to obtain and has a low cost, so that the production and manufacturing costs of the second support member 222 and even the cooling device 100 can be reduced.

[0082] The fiber material may be one or more composite materials selected from the group consisting of glass fiber, expanded glass fiber, ceramic fiber, carbon fiber, plant fiber, animal fiber, polypropylene fiber, and asbestos fiber.

[0083] It should be noted that the first support member 211 and the second support member 222 may be arranged in the same manner, which may facilitate the production of the thermal insulation assembly 20 and even the cooling device 100 .

[0084] Combination Figure 1-Figure 4 as well as Figure 7 and Figure 8 As shown, at least one of the first phase change heat absorption element 221 and the second phase change heat absorption element 212 is a hydrogel.

[0085] Specifically, the fiber material is randomly arranged and entangled, and has a large number of tiny pores inside. By setting at least one of the first phase change heat absorption element 221 and the second phase change heat absorption element 212 as a hydrogel, the hydrogel can be combined with the fiber material, and the hydrogel can be filled in the tiny pores of the mutually entangled fiber materials.

[0086] In this way, when the cooling device 100 performs the heat absorption and cooling function on the battery cell 200, the hydrogel is heated and vaporized. After the hydrogel is heated and vaporized, the hydrogel in the tiny pores of the fiber material is consumed and discharged, and the pores are converted into gas. Since the gas has excellent thermal insulation properties, the cooling device 100 can still have good thermal insulation properties after the hydrogel is consumed and the heat absorption is completed. Therefore, under the premise of ensuring that the cooling device 100 can perform the heat absorption and cooling function on the battery cell 200, the cooling device 100 can effectively suppress the heat transfer from the thermal runaway battery cell 200 to the adjacent non-thermal runaway battery cell 200, thereby improving the reliability of the battery assembly 1000.

[0087] It should be noted that the hydrogel can be made to completely fill the large number of tiny pores formed by the fiber material, or the hydrogel can be made to partially fill the large number of tiny pores of the fiber material, which is not specifically limited here. In addition, the pores in the first support member 211 and the pores in the second support member 222 can be pores in the fiber material. And when the pores in the fiber material are filled with phase change material, the internal phase change material must be removed to determine the porosity.

[0088] Combination Figure 1-Figure 4 as well as Figure 7 and Figure 8 As shown, the thickness of the thermal insulation component 20 is L1, and the thickness of the reinforcement area 21 is L2, and L1 and L2 satisfy the relationship: 0.9≤L2 / L1≤1. Specifically, the thickness direction of the thermal insulation component 20 is the same as the thickness direction of the reinforcement area 21, both of which are the spacing direction of two adjacent battery cells 200. The reinforcement area 21 is extended in the spacing direction of adjacent battery cells 200. By setting the ratio of the thickness of the reinforcement area 21 to the thickness of the thermal insulation component 20 within a reasonable range, the thickness of the reinforcement area 21 can be ensured to be more reasonable, and the thickness of the reinforcement area 21 can be avoided to be too small, thereby ensuring the support and limiting capacity of the reinforcement area 21 in the spacing direction of two adjacent battery cells 200, so that the non-thermal runaway battery cell 200 will have a certain distance from the thermal runaway battery cell 200, so that heat diffusion can be more reliably avoided, thereby improving the working performance of the cooling device 100 and the reliability of the battery assembly 1000.

[0089] Combination Figure 1-Figure 4 as well as Figure 9-Figure 14 As shown, the center of the enhanced region 21 corresponds to the center of the cooling device 100 .

[0090] Specifically, when the battery cell 200 thermal runaway occurs, the expansion force at the center of the large surface 201 of the battery cell is large, which easily squeezes the hydrogel in the middle position, causing the hydrogel to be squeezed and deformed. Since the hydrogel is relatively soft, the hydrogel in the middle position is easily squeezed out and overflows from the middle to the periphery of the large surface along the plane direction of the large surface, which will result in less heat absorption at the center of the large surface. In addition, after the hydrogel of the cooling device 100 is consumed, the large surfaces of the thermal runaway battery cell 200 and the adjacent non-thermal runaway battery cell 200 are likely to be close to each other, resulting in increased heat transfer.

[0091] Considering that the reinforcement area 21 is extended in the spacing direction of adjacent battery cells 200, the cooling device 100 is extended in the spacing direction of adjacent battery cells 200, so that the center of the reinforcement area 21 corresponds to the center of the cooling device 100, that is, the center of the side surface of the reinforcement area 21 adjacent to the battery cell 200 corresponds to the center of the side surface of the cooling device 100. In addition, the cooling device 100 is configured as a cuboid or a cube, and the center of the cooling device 100 corresponds to the center of the large surface 201 of the battery cell.

[0092] In this way, by making the center of the reinforcement area 21 correspond to the center of the cooling device 100, the center of the reinforcement area 21 can correspond to the center of the large surface 201 of the battery cell. In this way, the setting position of the reinforcement area 21 can be optimized. The reinforcement area 21 can not only effectively resist the expansion and deformation of the battery cell 200, but also after the first phase change heat absorbing element 221 is consumed, the reinforcement area 21 can also be supported between two adjacent large surfaces 201 of the battery cell, which can prevent the thermal runaway battery cell 200 from being close to the non-thermal runaway battery cell 200 and continuously insulate it, thereby preventing the occurrence of heat diffusion.

[0093] In some embodiments of the present invention, Figure 9-11 As shown, there is one reinforcement area 21, wherein the reinforcement area 21 is X-shaped, or the reinforcement area 21 is elliptical, or the reinforcement area 21 is long strip. Specifically, the reinforcement area 21 can be set as one, and the center of the reinforcement area 21 is located at the center of the insulation assembly 20, so as to ensure the normal operation of the reinforcement area 21.

[0094] Optionally, the reinforcement area 21 may be X-shaped, and the reinforcement area 21 extends from the center of the thermal insulation assembly 20 to the four corners of the cooling device 100 respectively.

[0095] Optionally, the reinforcement area 21 may be elliptical, with the major axis of the reinforcement area 21 being parallel to the length of the thermal insulation component 20 , and the minor axis of the reinforcement area 21 being parallel to the width of the thermal insulation component 20 .

[0096] Optionally, the reinforcement area 21 may be in the shape of an elongated strip, the length direction of the reinforcement area 21 is parallel to the length direction of the thermal insulation component 20 , and the width direction of the reinforcement area 21 is parallel to the width direction of the thermal insulation component 20 .

[0097] In other embodiments of the present invention, Fig.12 As shown, the reinforcement area 21 is block-shaped or spherical, and there are multiple reinforcement areas 21, and the multiple reinforcement areas 21 are arranged at intervals in the thermal insulation component 20. Specifically, the reinforcement area 21 can be arranged in multiples, and the reinforcement area 21 is block-shaped or spherical, and the multiple block-shaped or spherical reinforcement areas 21 are arranged at intervals in the thermal insulation component 20, so that the reinforcement areas 21 can be prevented from being concentrated in the thermal insulation component 20, so that the second phase change heat absorption element 212 in the reinforcement area 21 can overflow to the heat absorption area 22 after being squeezed, and the heat absorption and cooling capacity of the thermal insulation component 20 can be improved.

[0098] In other embodiments of the present invention, Fig.13As shown, the reinforcement area 21 is annular and there are multiple reinforcement areas 21, which are concentrically arranged and spaced apart from each other in the radial direction. In this way, the multiple reinforcement areas 21 are nested layer by layer, which can avoid the reinforcement areas 21 being concentrated in the heat insulation component 20, and can facilitate the second phase change heat absorption element 212 placed in the reinforcement area 21 in the middle to overflow to the surroundings after being squeezed, so as to improve the heat absorption and cooling capacity of the heat insulation component 20.

[0099] In some further embodiments of the present invention, Fig.14 As shown, the first phase change heat absorption member 221 is the same as the second phase change heat absorption member 212 and is a hydrogel, the first support member 211 and the second support member 222 are the same and are a fiber material, the reinforcement area 21 and the heat absorption area 22 may have no obvious boundary, and the volume fraction of the fiber material between the first support member 211 and the second support member 222 may gradually change along the plane direction.

[0100] In a specific embodiment of the present invention, Fig.14 As shown in the figure, the volume concentration of the fiber material is the highest at the center and gradually decreases along the length and width directions. The ellipse in the figure is the isovalue line of the volume concentration of the fiber material. The volume concentration gradually changes from the maximum value at the center to 0% at the edge closest to the periphery.

[0101] Combination Figure 5-Figure 6 As shown, the package body 10 may mainly include a first package film 11 and a second package film 12 , the circumferential edges of the first package film 11 and the second package film 12 are connected by heat compression, and the circumferential edge of the package body 10 is at least partially provided with a weak portion 13 .

[0102] Specifically, by setting the thermal insulation component 20 between the first packaging film 11 and the second packaging film 12, and then hot-pressing the circumferential edges of the first packaging film 11 and the second packaging film 12, the first packaging film 11 and the second packaging film 12 can together form a packaging body 10, thereby realizing the packaging of the thermal insulation component 20.

[0103] Furthermore, considering that at least part of the heat insulation component 20, for example, the first phase change heat absorber 221 can absorb the energy transmitted from the battery cell 200, and the temperature rises, when it reaches its phase change temperature, the first phase change heat absorber 221 will undergo phase change and absorb heat, and at the same time generate a large amount of gas and liquid. This causes the pressure inside the package 10 to rise. When the bursting pressure is reached, the weak part 13 can be opened, so that the liquid and gas can be drained, preventing the gas pressure of the package 10 from rising continuously, and preventing the expansion and deformation of the cooling device 100 from squeezing the adjacent battery cell 200, and avoiding damage to the structure of the adjacent battery cell 200 of the cooling device 100.

[0104] The weak portion 13 may be disposed at any position of the circumferential edge of the package body 10. Preferably, the package body 10 is rectangular, and the weak portion 13 is disposed at any one or more of the four corners of the package body 10.

[0105] Combination Figure 1 As shown, the battery assembly 1000 according to the utility model may include: a battery cell 200 and the above-mentioned cooling device 100. There are multiple battery cells 200, and the cooling device 100 is arranged between two adjacent battery cells 200, so that the cooling device 100 can not only play a role in absorbing heat and cooling between two adjacent battery cells 200, but also play a role in supporting and limiting between two adjacent battery cells 200, thereby realizing thermal management of the battery assembly 1000, avoiding heat diffusion, improving the reliability of the battery assembly 1000, and improving the working performance of the battery assembly 1000.

[0106] Furthermore, combined with Figure 1 As shown, the opposite side surfaces of two adjacent battery cells 200 are set as the battery cell large surface 201 , and the center of the reinforcement area 21 corresponds to the center of the battery cell large surface 201 .

[0107] Specifically, by applying the cooling device 100 to the battery assembly 1000, the cooling device 100 is set between the large cell surfaces 201 of two adjacent battery cells 200, and the center of the reinforcement area 21 corresponds to the center of the large cell surface 201. In this way, not only can the cooling device 100 absorb heat and cool the battery cell 200, but also the cooling device 100 can be supported and limited to be located between the battery cell 200 that has thermal runaway and the battery cell 200 that has not thermal runaway when the battery cell 200 has thermal runaway, so as to avoid the battery cell 200 that has thermal runaway from being close to the battery cell 200 that has not thermal runaway, and to keep a certain distance between the battery cell 200 that has thermal runaway and the battery cell 200 that has not thermal runaway, thereby avoiding the further spread of thermal runaway and improving the reliability of the battery assembly 1000.

[0108] The electric device according to the present invention may include: the above-mentioned battery assembly 1000, which can improve the reliability of the electric device and enhance the product competitiveness of the electric device. The electric device includes but is not limited to vehicles, and can also be energy storage equipment, etc.

[0109] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0111] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cooling device, characterized in that: include: Encapsulation body (10); A heat insulation component (20), the heat insulation component (20) being arranged in the packaging body (10), the heat insulation component (20) being provided with a reinforcement area (21) and a heat absorption area (22), the reinforcement area (21) being provided with a first support member (211), and the heat absorption area (22) being provided with a first phase change heat absorption member (221).

2. The cooling device according to claim 1, characterized in that: A second phase-change heat-absorbing element (212) is also provided in the enhanced region (21).

3. The cooling device according to claim 1, characterized in that: A second support member (222) is also provided in the heat absorption zone (22); the volume fraction of the first support member (211) in the enhanced zone (21) is K1, and the volume fraction of the second support member (222) in the heat absorption zone (22) is K2; K1 and K2 satisfy the relationship: K1>K2.

4. The cooling device according to claim 3, characterized in that: K1 and K2 satisfy the relationship: 10%≤K1≤100%, 0≤K2≤20%.

5. The cooling device according to claim 3, characterized in that: The porosity of the first support member (211) in the reinforcement zone (21) is K3, the porosity of the second support member (222) in the heat absorption zone (22) is K4, and K3 and K4 satisfy the relationship: K3≤K4, and / or K4-K3≥1%.

6. The cooling device according to claim 5, characterized in that: K3 and K4 satisfy the relationship: 0≤K3≤90%, 80%≤K4≤100%.

7. The cooling device according to claim 2, characterized in that: The volume fraction of the second phase-change heat absorption component (212) in the enhanced region (21) is K5, the volume fraction of the first phase-change heat absorption component (221) in the heat absorption region (22) is K6, and K3, K4, K5 and K6 satisfy the relationship: K6-K5≥1% and K5≤K3, K6≤K4.

8. The cooling device according to claim 3, characterized in that: At least one of the first support member (211) and the second support member (222) is made of fiber material.

9. The cooling device according to claim 2, characterized in that: At least one of the first phase-change heat absorption component (221) and the second phase-change heat absorption component (212) is a hydrogel.

10. The cooling device according to claim 1, characterized in that: The thickness of the thermal insulation component (20) is L1, the thickness of the reinforcement zone (21) is L2, and L1 and L2 satisfy the relationship: 0.9≤L2 / L1≤1.

11. The cooling device according to claim 1, characterized in that: The center of a side surface of the reinforcement area (21) close to the battery core corresponds to the center of a side surface of the cooling device (100) close to the battery core.

12. The cooling device according to claim 11, characterized in that There is one reinforcement area (21), and the reinforcement area (21) is X-shaped; and / or The enhanced region (21) is elliptical; and / or The reinforcement area (21) is in the shape of a long strip.

13. The cooling device according to claim 11, characterized in that: The reinforcement area (21) is annular and there are multiple of them. The multiple reinforcement areas (21) are concentrically arranged and spaced apart from each other in the radial direction.

14. The cooling device according to claim 11, characterized in that The reinforcement area (21) is block-shaped or spherical, there are multiple reinforcement areas (21), and the multiple reinforcement areas (21) are arranged at intervals in the thermal insulation component (20).

15. The cooling device according to claim 1, characterized in that The packaging body (10) comprises a first packaging film (11) and a second packaging film (12); the circumferential edges of the first packaging film (11) and the second packaging film (12) are connected by heat compression; and the circumferential edge of the packaging body (10) is at least partially provided with a weak portion (13).

16. A battery assembly, characterized in that: include: A battery cell (200), wherein the battery cell (200) is in plurality; The cooling device (100) according to any one of claims 1 to 15, wherein the cooling device (100) is arranged between two adjacent battery cells (200).

17. The battery assembly according to claim 16, characterized in that: The side surfaces of two adjacent battery cells (200) facing each other are set as the battery cell large surface (201), and the center of the reinforcement area (21) corresponds to the center of the battery cell large surface (201).

18. An electrical equipment, characterized in that: include: The battery assembly (1000) according to any one of claims 16-17.

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