Temperature equalizing assembly, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a temperature equalizing assembly, a battery pack and electric equipment, and relates to the technical field of automobile parts. The temperature equalizing assembly comprises a plate body used for being connected between a battery cell of a battery pack and a heating film, and the plate body is internally provided with a temperature equalizing cavity; the temperature equalizing part is arranged in the temperature equalizing cavity and is used for uniformly transferring heat generated by the heating film on one side to the battery cells on the other side through the plate body; the supporting piece is arranged between the inner wall of the temperature equalizing cavity and the temperature equalizing piece, and the supporting piece is used for supporting the temperature equalizing piece; according to the temperature equalizing assembly, the battery pack and the electric equipment, the battery cells can be uniformly heated, so that the service lives of the battery cells are prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile accessories, and in particular to a temperature equalizing assembly, a battery pack and an electric device. BACKGROUND

[0002] A battery pack of an automobile is provided with a plurality of battery cells, which are core components of the battery pack and are responsible for storing and releasing electric energy. The battery pack is also provided with a heating film connected to the battery cells, which is used to heat the battery cells in a low-temperature environment to improve the performance of the battery cells.

[0003] The heating film in the related art includes a film body and a heating resistance wire arranged in the film body. The heating resistance wire is powered to heat the battery cells.

[0004] However, the temperature of the battery cells close to the heating resistance wire is higher, while the temperature of the battery cells far from the heating resistance wire is lower, resulting in uneven heating of the battery cells and inconsistent electrochemical reaction rates inside the battery cells, which affects the service life of the battery cells. UTILITY MODEL CONTENT

[0005] The embodiments of the present application provide a temperature equalizing assembly, a battery pack and an electric device to solve the technical problem of uneven heating of the battery cells by the heating film in the related art, thereby affecting the service life of the battery.

[0006] In a first aspect, the embodiments of the present application provide a temperature equalizing assembly, comprising:

[0007] a plate body, the plate body being used to connect between a battery cell and a heating film of a battery pack, the plate body having a temperature equalizing cavity therein;

[0008] a temperature equalizing member, the temperature equalizing member being arranged in the temperature equalizing cavity, the temperature equalizing member being used to uniformly transmit heat generated by one side of the heating film to the other side of the battery cell through the plate body;

[0009] a support member, the support member being arranged between an inner wall of the temperature equalizing cavity and the temperature equalizing member, the support member being used to support the temperature equalizing member.

[0010] In some embodiments, the temperature equalizing member includes a first liquid absorbing portion, the first liquid absorbing portion being arranged on a side of the temperature equalizing cavity close to the heating film, the first liquid absorbing portion being used to evaporate liquid working medium stored therein when heated to uniformly transmit heat generated by evaporation to the battery cell through the plate body.

[0011] In some embodiments, the first liquid absorbing portion is arranged as one or at least one of a metal sintered particle member, a woven wire mesh member and a synthetic fiber member.

[0012] In some embodiments, the support member comprises a plurality of support portions, the plurality of support portions are arranged between the inner wall of the temperature uniformizing cavity and the temperature uniformizing member, and a temperature uniformizing space is formed between adjacent support portions.

[0013] In some embodiments, the support portion is configured as a second liquid absorbing portion, the second liquid absorbing portion is configured to evaporate liquid working medium stored in the second liquid absorbing portion when heated, and the heat generated by the evaporation is uniformly transmitted to the battery cell through the plate body.

[0014] In some embodiments, the second liquid absorbing portion is configured as one or at least one of a metal sintering member, a woven wire mesh member, and a synthetic fiber member.

[0015] In some embodiments, the temperature uniformizing cavity is provided with a plurality of protrusions on a surface facing the temperature uniformizing member.

[0016] In some embodiments, the plate body comprises a frame body, a heat absorbing plate, and a heat releasing plate, the heat absorbing plate is arranged on a side of the frame body close to the heating film, the heat releasing plate is arranged on a side of the frame body away from the heating film, and the temperature uniformizing cavity is arranged between the frame body, the heat absorbing plate, and the heat releasing plate.

[0017] In some embodiments, an elastic member is further included, the elastic member is configured to be connected between the plate body and the heating film.

[0018] In some embodiments, the elastic member is a heat conducting member.

[0019] In a second aspect, the embodiments of the present application provide a battery pack, comprising a battery cell and the temperature uniformizing assembly arranged on the battery cell.

[0020] In a second aspect, the embodiments of the present application provide a use electric device, comprising a device body and the battery pack arranged on the device body.

[0021] The embodiment of the present application provides a temperature equalizing assembly, a battery pack and an electric equipment. The temperature equalizing assembly provided by the present application can uniformly transmit the heat generated by the heating film to the battery cell through the plate body, so that the temperature of each part of the battery cell is consistent, local overheating or overcooling is avoided, the electrochemical reaction in the battery cell is more uniform, the service life of the battery cell is prolonged, the charge and discharge performance of the battery cell is optimized, especially in a low-temperature environment, uniform heating can significantly improve the charge and discharge efficiency and power output of the battery cell, and uneven temperature can increase the thermal stress in the battery cell, thereby affecting the structural stability of the battery cell, and the temperature equalizing assembly can effectively reduce the thermal stress and reduce the aging and damage of the battery cell. The temperature equalizing assembly can uniformly distribute heat and effectively reduce the possibility of local overheating, thereby improving the safety of the battery cell; and the support can effectively support the plate body when the battery cell is expanded and extruded against the plate body, thereby improving the strength of the plate body. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] Figure 1 A structure schematic diagram of an assembled state of the temperature equalizing assembly provided by the present application is provided.

[0024] Figure 2 A zoomed-in view of part A in FIG. 1 is provided. Figure 1

[0025] Figure 3 An exploded structure schematic diagram of the temperature equalizing assembly provided by the present application is provided.

[0026] Figure 4 A zoomed-in view of part B in FIG. 2 is provided. Figure 3

[0027] Explanation of reference signs:

[0028] 100, plate body; 110, temperature equalizing cavity; 111, protruding part;

[0029] 120, frame body; 130, heat absorbing plate; 140, heat releasing plate;

[0030] 200, temperature equalizing part; 210, first liquid absorbing part;

[0031] 300, support part; 310, supporting part; 320, temperature equalizing space;

[0032] 400, elastic part;

[0033] 500, battery cell;

[0034] 600, heating film. ​​

[0035] The specific embodiments of the application have been shown by way of example in the above figures, and will be described in more detail hereafter. These figures and this written description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept to one of ordinary skill in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail with reference to the drawings, of which like reference numerals indicate like elements throughout the various figures. The following detailed description is not intended to limit the embodiments to particular embodiments described, but rather just to explain the inventive concept as claimed below.

[0037] The heating film in the related art includes a film body and a heating resistance wire arranged in the film body, and the heating resistance wire heats the battery cell by being electrified.

[0038] However, the temperature of the position of the battery cell close to the heating resistance wire is higher, and the temperature of the position of the battery cell far from the heating resistance wire is lower, which causes the battery cell to be unevenly heated, resulting in inconsistent electrochemical reaction rates inside the battery cell, and affecting the service life of the battery cell.

[0039] The technical solutions of the application and how the technical solutions of the application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the application will be described below with reference to the drawings.

[0040] In combination Figures 1 to 4 A uniform temperature assembly includes:

[0041] A plate body 100 is used to connect between a battery cell 500 and a heating film 600 of a battery pack, and the plate body 100 has a uniform temperature cavity 110 therein;

[0042] A uniform temperature piece 200 is arranged in the uniform temperature cavity 110, and the uniform temperature piece 200 is used to uniformly transmit the heat generated by one side of the heating film 600 to the other side of the battery cell 500 through the plate body 100;

[0043] A support piece 300 is arranged between the inner wall of the uniform temperature cavity 110 and the uniform temperature piece 200, and the support piece 300 is used to support the uniform temperature piece 200.

[0044] In the embodiment, the battery cell 500 is a square battery cell, and the plate body 100 is arranged in a rectangular shape matched with the square battery cell; the area of the plate body 100 is the same as the area of one side of the square battery cell, and the thickness of the plate body 100 is smaller than the thickness of the square battery cell. The thickness of the plate body 100 can be greater than the thickness of the heating film 600, or the thickness of the plate body 100 can be smaller than the thickness of the heating film 600. In other embodiments, for example, the battery cell 500 is a circular battery cell, and the plate body 100 can be arranged in an arc shape matched with the circular battery cell.

[0045] In the present application, by adopting the arrangement of the temperature equalizing member 200, the temperature equalizing member 200 can uniformly transmit the heat generated by the heating film 600 to the battery cell 500 through the plate body 100, so that the temperature of each part of the battery cell 500 is consistent, avoiding local overheating or overcooling, and making the electrochemical reaction inside the battery cell 500 more uniform, thereby prolonging the service life of the battery cell 500 and helping to optimize the charge and discharge performance of the battery cell 500. Especially in a low-temperature environment, uniform heating can significantly improve the charge and discharge efficiency and power output of the battery cell 500; uneven temperature can increase the thermal stress inside the battery cell 500, thereby affecting the structural stability of the battery cell 500. The temperature equalizing member 200 can effectively reduce such thermal stress and reduce the aging and damage of the battery cell 500. The temperature equalizing member 200 uniformly distributes heat, effectively reducing the possibility of local overheating, thereby improving the safety of the battery cell 500 in use; by adopting the arrangement of the support member 300, when the battery cell 500 expands and presses the plate body 100 during charging and discharging, the support member 300 can effectively support the plate body 100, thereby improving the strength of the plate body 100.

[0046] In combination Figures 1 to 4 , the temperature equalizing member 200 includes a first liquid absorbing portion 210, which is arranged on the side of the temperature equalizing cavity 110 close to the heating film 600. The first liquid absorbing portion 210 is used to evaporate the liquid working medium stored in the first liquid absorbing portion 210 when heated, so as to uniformly transmit the heat generated by evaporation to the battery cell 500 through the plate body 100.

[0047] In the embodiment, the liquid working medium is set as one of water, an organic solvent, a nanofluid, and a refrigerant. Water has a high specific heat capacity and latent heat, excellent heat transfer performance, and is one of the most commonly used liquid working mediums. The organic solvent is, for example, methanol, ethanol, or acetone. These liquid working mediums have a low boiling point and good volatility, and are suitable for scenarios requiring rapid phase change heat transfer.

[0048] In the present application, by adopting the arrangement of the first liquid absorbing part 210, when the plate body 100 is heated by the heating film 600 on the side facing the heating film 600, the liquid working medium in the first liquid absorbing part 210 absorbs heat and evaporates into a gaseous state; then, the steam flows to the side of the plate body 100 facing the battery cell 500 under the action of the pressure difference, and recondenses into a liquid state after releasing heat on the side of the plate body 100 facing the battery cell 500, and the condensed liquid returns by the capillary action of the first liquid absorbing part 210, completing a cycle. By adopting this phase change cycle of the first liquid absorbing part 210, heat can be efficiently transferred, and the heat exchange effect between the heating film 600 and the battery cell 500 can be significantly enhanced. By adopting the arrangement of the first liquid absorbing part 210 and the plate body 100, the evaporation and condensation area is larger, and the heat can be more evenly distributed.

[0049] The first liquid absorbing part 210 is one or at least one of a metal sintered particle, a woven wire mesh, and a synthetic fiber.

[0050] In the present embodiment, the first liquid absorbing part 210 is a metal sintered particle, which is a copper powder sintered liquid absorbing core. The copper powder sintered liquid absorbing core is mainly sintered from copper powder, which can provide strong capillary pressure to quickly drive the return flow of condensed liquid. Copper has a high thermal conductivity, which can quickly transfer heat. The woven wire mesh is usually sintered from a metal wire mesh, and the material includes stainless steel, copper, etc. The liquid working medium in the woven wire mesh has small flow resistance, which is suitable for fast heat transfer. The manufacturing process is relatively simple, and the cost is relatively low, which is suitable for scenarios that require flexibility and foldability. The foam metal type liquid absorbing core is mainly foam copper or foam aluminum, which can provide large capillary force and liquid storage capacity. The foam structure makes the overall weight lighter, which is suitable for applications that require high mechanical strength. The grooved type liquid absorbing core is usually processed with micro grooves on a metal substrate, and the material is copper or aluminum alloy. The groove structure helps to quickly conduct heat, and the liquid flows smoothly in the groove, reducing thermal resistance. The composite liquid absorbing core is composed of two or more single liquid absorbing core structures, such as groove-powder sintering type and wire mesh-powder sintering type. The composite liquid absorbing core combines the advantages of different liquid absorbing cores, such as high capillary force, high permeability, and high thermal conductivity. The structure can be adjusted according to different application scenarios to improve the overall heat transfer efficiency.

[0051] In other embodiments, the metal sintered particle, the woven wire mesh, and the synthetic fiber can be mixed to form the first liquid absorbing part 210.

[0052] In combination Figures 1 to 4 The support 300 includes a plurality of support parts 310, which are arranged between the inner wall of the uniform temperature cavity 110 and the uniform temperature part 200, and a uniform temperature space 320 is formed between adjacent support parts 310.

[0053] In the embodiment, the support part 310 is in a strip shape, the cross section of the strip-shaped support part 310 is in a rectangular shape, one end of the strip-shaped support part 310 is connected to the top wall of the uniform temperature cavity 110, and the other end of the strip-shaped support part 310 is connected to the bottom wall of the uniform temperature cavity 110. In other embodiments, the support part 310 can also be arranged in the horizontal direction.

[0054] By adopting the arrangement of multiple support parts 310, the support strength of the plate body 100 can be further improved, thereby improving the strength of the plate body 100, and by arranging multiple support parts 310 at intervals, the support part 310 can be prevented from affecting the heating of the battery cell 500 by the first liquid absorbing part 210; by adopting multiple uniform temperature spaces 320, the evaporated liquid working medium can be limited, and the liquid working medium evaporated after the first liquid absorbing part 210 is heated can flow in the multiple uniform temperature spaces 320, respectively, thereby preventing the liquid working medium from flowing unevenly to different positions in the uniform temperature cavity 110 after evaporation, and further improving the uniformity of the heating of the battery cell 500 by the plate body 100.

[0055] In combination Figures 1 to 4 , the support part 310 is arranged as a second liquid absorbing part, and the second liquid absorbing part is used to evaporate the liquid working medium stored in the second liquid absorbing part when heated, so as to uniformly transmit the heat generated by evaporation to the battery cell 500 through the plate body 100.

[0056] By arranging the support part 310 as the same second liquid absorbing part as the first liquid absorbing part 210, the second liquid absorbing part not only has the effect of supporting, but also can store more liquid working medium in cooperation with the first liquid absorbing part 210, and when the support part 310 is heated, the liquid working medium can also be evaporated, so that the evaporated liquid working medium can further uniformly heat the battery cell 500 through the plate body 100; and the side of the plate body 100 facing the battery cell 500 can be heated by the second liquid absorbing part relative to the position of the second liquid absorbing part, so that the side of the plate body 100 facing the battery cell 500 is uniformly heated, thereby further improving the uniformity of the heating of the battery cell 500 by the plate body 100.

[0057] The second liquid absorbing part is arranged as one or at least one of a metal sintering part, a woven wire mesh part, and a synthetic fiber part.

[0058] In the embodiment, the second liquid absorbing part is a metal sintered particle piece, the metal sintered particle piece is a copper powder sintered liquid absorbing core, the copper powder sintered liquid absorbing core is mainly sintered by copper powder, can provide strong capillary pressure, quickly drive the return flow of condensed liquid, the thermal conductivity of copper is high, can quickly transfer heat; the woven wire mesh piece is usually sintered by metal wire mesh, the material includes stainless steel, copper and the like, the liquid working medium in the woven wire mesh piece has small flow resistance, is suitable for fast heat transfer, the manufacturing process is relatively simple, the cost is low, and is suitable for scenes requiring flexibility and foldability; the foam metal type liquid absorbing core is mainly foam copper or foam aluminum, can provide larger capillary force and liquid storage capacity, the foam structure makes the overall weight lighter, is suitable for applications requiring higher mechanical strength; the groove type liquid absorbing core is usually processed with micro grooves on a metal substrate, the material is copper or aluminum alloy, the groove structure helps to quickly conduct heat, the liquid flows smoothly in the groove, reduces thermal resistance, and the composite liquid absorbing core is composed of two or more single liquid absorbing core structures, such as a groove-powder sintering type, a wire mesh-powder sintering type and the like, the composite liquid absorbing core combines the advantages of different liquid absorbing cores, such as high capillary force, high permeability and high thermal conductivity, and can be adjusted according to different application scenes to improve overall heat transfer efficiency.

[0059] In other embodiments, the metal sintered particle piece, the woven wire mesh piece and the synthetic fiber piece can be mixed to form the second liquid absorbing part.

[0060] In combination Figures 1 to 4 The face of the uniform temperature cavity 110 towards the uniform temperature piece 200 is provided with a plurality of protruding parts 111.

[0061] In the embodiment, a plurality of protruding parts 111 are arranged in the plurality of uniform temperature spaces 320, the plurality of protruding parts 111 are distributed along the height direction of the uniform temperature space 320, the protruding part 111 is arranged in a triangular prism shape, and the plurality of protruding parts 111 are staggered from top to bottom.

[0062] In other embodiments, the shape of the protruding part 111 can be adaptively adjusted as needed, for example, the protruding part 111 is arranged in a semicircular spherical shape.

[0063] The present application adopts the arrangement of multiple protrusions 111. When the liquid working medium evaporates and flows to the surface of the plate body 100 close to the battery 500, the multiple protrusions 111 can change the wettability of the liquid working medium, making the liquid working medium more inclined to form droplets rather than a continuous liquid film. This phenomenon is called dropwise condensation. After the droplets form on the protrusions 111, they will slide down due to gravity or surface tension, rather than accumulating and increasing in thickness like a continuous liquid film. The thermal resistance of dropwise condensation is much smaller than that of film condensation. Because the surface area to volume ratio of the droplets is larger, heat is more easily transferred from the vapor to the wall, thereby further improving the heating efficiency of the plate body 100 on the battery 500. Moreover, the multiple protrusions 111 can disrupt the continuity of the liquid film, causing the liquid film to form faults or gaps between the multiple protrusions 111. These gaps can reduce the thickness of the liquid film, thereby reducing the thermal resistance. The thinner the liquid film, the shorter the heat transfer path and the higher the heat transfer efficiency.

[0064] In combination Figures 1 to 4 The plate body 100 includes a frame 120, a heat absorption plate 130, and a heat release plate 140. The heat absorption plate 130 is arranged on the side of the frame 120 close to the heating film 600, the heat release plate 140 is arranged on the side of the frame 120 away from the heating film 600, and the uniform temperature cavity 110 is arranged between the frame 120, the heat absorption plate 130, and the heat release plate 140.

[0065] In this embodiment, the frame 120 is arranged in a rectangular shape, the heat absorption plate 130 closes the side of the frame 120 close to the heating film 600, and the heat release plate 140 closes the side of the frame 120 away from the heating film 600. The frame 120, the heat absorption plate 130, and the heat release plate 140 are made of the same material, and are made of copper or aluminum alloy. The multiple protrusions 111 are arranged on the surface of the heat release plate 140 facing the heat absorption plate 130, and the support 310 is connected between the heat release plate 140 and the first liquid absorption portion 210.

[0066] In other embodiments, the shape of the frame 120 can be adjusted as needed, for example, the frame 120 can be adjusted to a circular shape.

[0067] The application adopts the arrangement of the frame 120, the heat absorption plate 130 and the heat release plate 140, when the heat absorption plate 130 is heated by the heating film 600, the liquid working medium in the first liquid absorption part 210 and the second liquid absorption part absorbs heat and evaporates into gas; then, the steam flows to the heat release plate 140 under the action of the pressure difference, and is condensed into liquid after releasing heat in the heat release plate 140, and the condensed liquid returns through the capillary action of the first liquid absorption part 210 and the second liquid absorption part, completing a cycle. Through the arrangement of the heat absorption plate 130 and the heat release plate 140, the plate body 100 can better absorb the heat of the heating film 600 through the heat absorption plate 130 made of copper or aluminum alloy, and better release the heat generated by the evaporation of the liquid working medium through the heat release plate 140 made of copper or aluminum alloy, thereby improving the heat conduction efficiency and indirectly improving the heating efficiency of the battery cell 500.

[0068] In combination Figures 1 to 4 The uniform temperature plate further comprises an elastic member 400, which is used to be connected between the plate body 100 and the heating film 600.

[0069] The elastic member 400 is a heat-conducting member.

[0070] In the embodiment, the elastic member 400 can be a heat-conducting elastomer, which is a composite material combining heat conduction and elasticity. It takes elastomer as the base, and adds heat-conducting fillers such as metal powder, carbon nanotube or graphene, etc., to give the material high thermal conductivity. Its advantages include: maintaining excellent physical properties in a large elastic deformation range, perfectly fitting various complex shapes and structure requirements; closely adhering to the heating film 600 and the plate body 100, which not only ensures excellent thermal contact, but also effectively absorbs the vibration and impact caused by the battery cell 500.

[0071] The elastic member 400 can also be a liquid metal composite elastomer, which is a material composed of liquid metal (such as gallium-indium alloy) and elastomer matrix (such as polyborosiloxane elastomer). Its characteristics include: the combination of high thermal conductivity of liquid metal and flexibility of elastomer, which has excellent mechanical properties and thermal conductivity. The polyborosiloxane elastomer matrix has unique strain rate hardening characteristics and bonding properties, which makes it have good adaptability in complex load environment.

[0072] The elastic member 400 can also be a material composed of graphene and elastomer (such as polydimethylsiloxane), which has the following characteristics: the combination of high thermal conductivity of graphene and flexibility of elastomer significantly improves the thermal conductivity of the material. By optimizing the content and distribution of graphene, the thermal conductivity and mechanical properties of the composite material can be further improved.

[0073] The elastic member 400 can also be a material composed of carbon nanotubes and an elastomer, which has the following characteristics: the high thermal conductivity and high strength of carbon nanotubes combined with the flexibility of the elastomer make the composite material maintain good elasticity while having high thermal conductivity. By optimizing the content and network structure of carbon nanotubes, the thermal conductivity and mechanical properties of the composite material can be further improved.

[0074] The elastic member 400 can also be hexagonal boron nitride, which is a material with high thermal conductivity and electrical insulation, often used in combination with elastomers. Its characteristics include: the high thermal conductivity and electrical insulation of hexagonal boron nitride make it have important applications in electronic packaging and thermal interface materials; by combining hexagonal boron nitride with liquid metal (such as EGaIn) and filling it into an elastomer (such as Ecoflex), the thermal conductivity and electrical insulation of the composite material can be further improved.

[0075] The elastic member 400 can also be expanded graphite, which is a stripped form of graphite with high thermal conductivity. Its characteristics include: the high thermal conductivity and flexibility of expanded graphite make it have important applications in thermal conductive composites. By combining expanded graphite with an elastomer, the thermal conductivity and mechanical properties of the composite material can be further improved.

[0076] By using the elastic member 400 and the thermal conductive member, the thermal conductive member has high thermal conductivity, which can quickly transfer the heat generated by the heating film 600 to the plate body 100, reducing the loss of heat in the transfer process; the thermal conductive member can evenly distribute the heat to the plate body 100, avoiding local overheating caused by heat concentration, thereby achieving uniform heating of the battery cell 500; the elastic member 400 can adapt to the unevenness of the heating film 600 and the surface of the battery cell 500, ensuring close contact between the two, reducing local overheating or overcooling; the elastic member 400 can fill the small gaps between the heating film 600 and the battery cell 500, further reducing thermal resistance and improving heat transfer efficiency; the elastic member 400 can absorb the vibration and impact generated by the battery cell 500 during use, protecting the battery cell 500 from mechanical damage and enhancing the reliability of the battery cell 500 system; the combination of the elastic member 400 and the thermal conductive member can adapt to different battery pack designs and working conditions, including irregularly shaped battery cells 500 and complex battery pack structures; by adjusting the thickness and material of the elastic member 400 and the thermal conductive member, the thermal management performance can be flexibly optimized to meet the needs of different application scenarios.

[0077] The application also provides a battery pack, which comprises a battery cell 500 and a uniform temperature assembly of any of the above embodiments arranged on the battery cell 500.

[0078] The specific structure of the uniform temperature assembly has been described in detail in the above embodiments and will not be repeated here.

[0079] The embodiment of the application further provides a power utilization device, comprising a device body and the battery pack of any one of the above embodiments arranged on the device body.

[0080] In the embodiment, the power utilization device is a car, and the battery pack is a battery pack of the car. In other embodiments, the power utilization device can also be replaced by other devices with the battery cell 500 and needing to heat the battery cell 500.

[0081] The power utilization device provided by the embodiment of the application is provided with the battery pack. When the heat absorption plate 130 is heated by the heating film 600, the liquid state working medium in the first liquid absorption part 210 and the second liquid absorption part absorbs heat and evaporates into a gaseous state. Then, the steam flows to the heat release plate 140 under the action of the pressure difference. Because the heat release plate 140 has a plurality of protruding parts 111, the steam is condensed into a liquid state after releasing heat on the heat release plate 140. The condensed liquid returns by the capillary action of the first liquid absorption part 210 and the second liquid absorption part, and completes a cycle. The first liquid absorption part 210 and the second liquid absorption part can uniformly transmit the heat generated by the heating film 600 to the battery cell 500 through the heat release plate 140, so that the temperature of each part of the battery cell 500 is consistent, local overheating or overcooling is avoided, the electrochemical reaction in the battery cell 500 is more uniform, the service life of the battery cell 500 is prolonged, and the charge and discharge performance of the battery cell 500 is optimized. Especially in a low temperature environment, uniform heating can significantly improve the charge and discharge efficiency and power output of the battery cell 500. Temperature unevenness can increase the thermal stress in the battery cell 500, and then affect the structural stability of the battery cell 500. The first liquid absorption part 210 and the second liquid absorption part can effectively reduce the thermal stress and reduce the aging and damage of the battery cell 500. The temperature equalizing piece 200 can effectively reduce the possibility of local overheating by uniformly distributing heat, thereby improving the safety of the battery cell 500.

[0082] Finally, it should be noted that: other embodiments of the application will be easily thought of by those skilled in the art after considering the specification and practicing the application. The application is intended to cover any variations, uses or adaptive changes of the application, which follow the general principles of the application and include common knowledge or conventional technical means in the technical field of the application not disclosed by the application, and are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is only limited by the appended claims.

Claims

1. A uniform temperature assembly, characterized by, The application relates to a temperature equalizing assembly for a battery pack. The temperature equalizing assembly comprises a plate body (100) for connecting between a battery cell (500) and a heating film (600), the plate body (100) having a temperature equalizing cavity (110) therein; a temperature equalizing member (200) arranged in the temperature equalizing cavity (110), the temperature equalizing member (200) being used for uniformly transferring heat generated by the heating film (600) on one side to the battery cell (500) on the other side through the plate body (100); a support member (300) arranged between the inner wall of the temperature equalizing cavity (110) and the temperature equalizing member (200), the support member (300) being used for supporting the temperature equalizing member (200).

2. The uniform temperature assembly of claim 1, wherein, The temperature equalizing member (200) comprises a first liquid absorbing part (210) arranged on the side of the temperature equalizing cavity (110) close to the heating film (600), the first liquid absorbing part (210) being used for evaporating liquid working medium stored in the first liquid absorbing part (210) when heated to uniformly transfer heat generated by evaporation to the battery cell (500) through the plate body (100).

3. The uniform temperature assembly of claim 2, wherein, The first liquid absorbing part (210) is arranged as one or at least one of a metal sintering particle member, a woven wire mesh member and a synthetic fiber member.

4. The uniform temperature assembly of claim 1, wherein, The support member (300) comprises a plurality of support parts (310) arranged at intervals between the inner wall of the temperature equalizing cavity (110) and the temperature equalizing member (200), and a temperature equalizing space (320) is formed between adjacent support parts (310).

5. The uniform temperature assembly of claim 4, wherein, The support part (310) is arranged as a second liquid absorbing part, the second liquid absorbing part being used for evaporating liquid working medium stored in the second liquid absorbing part when heated to uniformly transfer heat generated by evaporation to the battery cell (500) through the plate body (100).

6. The uniform temperature assembly of claim 5, wherein, The second liquid absorbing part is arranged as one or at least one of a metal sintering member, a woven wire mesh member and a synthetic fiber member.

7. The uniform temperature assembly of any of claims 1-6, wherein, A plurality of protruding parts (111) are arranged on the surface of the temperature equalizing cavity (110) facing the temperature equalizing member (200).

8. The uniform temperature assembly of any of claims 1-6, wherein, The plate body (100) comprises a frame body (120), a heat absorbing plate (130) arranged on the side of the frame body (120) close to the heating film (600) and a heat releasing plate (140) arranged on the side of the frame body (120) away from the heating film (600), and the temperature equalizing cavity (110) is arranged between the frame body (120), the heat absorbing plate (130) and the heat releasing plate (140).

9. The uniform temperature assembly of any of claims 1-6, wherein, The temperature equalizing assembly further comprises an elastic member (400) for connecting between the plate body (100) and the heating film (600).

10. The uniform temperature assembly of claim 9, wherein, The elastic member (400) is a heat conducting member.

11. A battery pack, characterized by The application further relates to a battery pack comprising a battery cell (500) and a temperature equalizing assembly arranged on the battery cell (500) and as claimed in any one of claims 1-10.

12. An electrical device, characterized by The application further relates to a device body and a battery pack arranged on the device body and as claimed in claim 11.

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