Temperature uniform plate, cell temperature uniform device, battery pack and electric equipment

Abstract

Embodiments of the present application provide a uniform temperature plate, a battery cell temperature equalizing device, a battery pack and an electrical equipment, and relate to the technical field of energy storage. The uniform temperature plate is used for heat exchange and temperature equalization of a battery cell. A plurality of flow channels that are not in communication with each other are formed in the uniform temperature plate, and a heat exchange medium is arranged in the flow channels. The uniform temperature plate comprises a first heat exchange area and a second heat exchange area. The first heat exchange area is used for being opposite to and exchanging heat with a second area of the battery cell, which is outside a first area. The second heat exchange area is used for being opposite to and exchanging heat with an area of the battery cell, which is except for an electrode. The heat generation of the first area is higher than that of the second area. The heat exchange amount of the flow channels of the first heat exchange area is higher than that of the flow channels of the second heat exchange area. The uniform temperature plate can form a cooling scheme with different heat exchange degrees for different heat generation areas of the battery cell, and improve the heat exchange efficiency and heat exchange effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a uniform temperature plate, a cell uniform temperature device, a battery pack and an electric equipment. BACKGROUND

[0002] With the continuous popularity of electric vehicles, the use performance requirements of power batteries in electric vehicles are also getting higher and higher. Among them, the temperature has a greater impact on the use performance of the battery, so the heat exchange requirements of the battery are also increasing.

[0003] At present, the cold plate of the battery on the market is directly connected with the air conditioning system of the electric vehicle, so that the refrigerant of the air conditioning system circulates directly in the circulating pipeline inside the cold plate. However, the fast charging process of the battery causes the heat generation of the cell to increase sharply, and the current cooling method of circulating refrigerant in the cold plate pipeline cannot meet the cooling demand of the system, resulting in low uniform temperature efficiency and poor uniform temperature effect of the battery. SUMMARY

[0004] The embodiments of the present application provide a uniform temperature plate, a cell uniform temperature device, a battery pack and an electric equipment, which can simplify the flow channel structure, avoid flow channel backflow difficulty, and significantly improve the cooling efficiency and cooling effect of the cells in the battery pack.

[0005] In a first aspect, the embodiments of the present application provide a uniform temperature plate for heat exchange and uniform temperature of a cell, a plurality of flow channels that are not connected to each other are formed in the uniform temperature plate, and a heat exchange medium is arranged in the flow channels.

[0006] The uniform temperature plate comprises a first heat exchange area and a second heat exchange area, the first heat exchange area is used for being opposite to and exchanging heat with a first area of the cell, and the second heat exchange area is used for being opposite to and exchanging heat with a second area of the cell except the first area, and the heat generation of the first area is higher than that of the second area.

[0007] The heat exchange amount of the flow channels of the first heat exchange area is higher than that of the flow channels of the second heat exchange area.

[0008] In a possible implementation, along the direction from the first heat exchange area to the second heat exchange area, the heat exchange amount of the flow channels gradually decreases.

[0009] In a possible implementation, the arrangement density of the flow channels of the first heat exchange area is greater than that of the flow channels of the second heat exchange area.

[0010] In a possible implementation, along the direction from the first heat exchange area to the second heat exchange area, the arrangement density of the flow channels gradually decreases.

[0011] In a possible implementation, the cross-sectional area of the flow channel of the first heat exchange region is greater than the cross-sectional area of the flow channel of the second heat exchange region.

[0012] In a possible implementation, the cross-sectional area of the flow channel gradually decreases in the direction from the first heat exchange region to the second heat exchange region.

[0013] In a possible implementation, the flow rate of the flow channel of the first heat exchange region is greater than the flow rate of the flow channel of the second heat exchange region.

[0014] In a possible implementation, the flow rate of the flow channel gradually decreases in the direction from the first heat exchange region to the second heat exchange region.

[0015] In a possible implementation, the first heat exchange region includes a first sub heat exchange region and a second sub heat exchange region, the first sub heat exchange region corresponds to and exchanges heat with the first end of the battery cell, and the second sub heat exchange region corresponds to and exchanges heat with the second end of the battery cell.

[0016] In a possible implementation, the heat exchange amount of the flow channel of at least one of the first sub heat exchange region and the second sub heat exchange region is higher than the heat exchange amount of the second heat exchange region.

[0017] In a possible implementation, the first sub heat exchange region and the second sub heat exchange region are respectively located at two ends of the extension direction of the vapor chamber, and the second heat exchange region is located in the middle of the extension direction of the vapor chamber.

[0018] In a possible implementation, the flow channels are spaced apart.

[0019] In a possible implementation, the flow channels are closed flow channels, and the flow channels are independently arranged.

[0020] In a possible implementation, the gap between adjacent flow channels in the first heat exchange region is 5 mm to 10 mm.

[0021] In a possible implementation, the gap between adjacent flow channels in the second heat exchange region is 5 mm to 20 mm.

[0022] In a possible implementation, the cross section of the flow channel is rectangular, the width of the flow channel is 10 mm to 50 mm, and the height of the flow channel is 1.5 mm to 3.5 mm.

[0023] In a possible implementation, the vapor chamber is a harmonica pipe provided with a plurality of closed flow channels, and the plurality of harmonica pipes are independently distributed.

[0024] In a possible implementation, the vapor chamber includes a bottom plate and a top plate.

[0025] The top plate is provided with a plurality of flow grooves, and the bottom plate is connected to the top plate in a buckling manner, covers the flow grooves, and forms the flow channels.

[0026] In a possible implementation, the top plate is provided with liquid injection holes equal in number to the flow grooves, and each liquid injection hole is distributed and communicated with each flow groove one by one.

[0027] In a possible implementation, the filling amount of the flow channels of at least one of the first sub-heat exchange zone and the second sub-heat exchange zone is higher than the filling amount of the second heat exchange zone.

[0028] In a possible implementation, the filling amount of the heat exchange medium in the flow channels is 40% to 80% of the cavity volume of the flow channels.

[0029] In a possible implementation, the heat exchange medium is a phase change medium.

[0030] In a second aspect, the embodiments of the present application provide an electric cell temperature equalization device.

[0031] In a possible implementation, the number of the temperature equalization plates is two, and the two temperature equalization plates are respectively arranged on the opposite two surfaces of the electric cell.

[0032] In a possible implementation, the temperature equalization device further comprises a cold plate, and the cold plate is internally provided with an electrode cooling channel and a middle cooling channel.

[0033] The electrode cooling channel is used to be opposite to and exchange heat with the first zone of the electric cell, and the middle cooling channel is used to be opposite to and exchange heat with the second zone of the electric cell.

[0034] The cold plate and the temperature equalization plate are respectively arranged on the opposite two surfaces of the electric cell.

[0035] In a third aspect, the embodiments of the present application provide a battery pack comprising a plurality of electric cells and the electric cell temperature equalization device.

[0036] In a possible implementation, the battery pack comprises a sealing cover and a shell, the electric cell is arranged in the shell, the sealing cover covers the shell, and the electric cell is located between the shell and the sealing cover.

[0037] The electric cell temperature equalization device is built in the sealing cover and / or the shell.

[0038] In a third aspect, the embodiments of the present application provide a power consumption device comprising the battery pack.

[0039] The even-temperature plate, the cell even-temperature device, the battery pack and the electric equipment provided by the embodiments of the present application, a plurality of flow channels that are not communicated with each other and are independently distributed are formed in the even-temperature plate, and a heat exchange medium is accommodated in the flow channels. The even-temperature plate comprises a first heat exchange zone and a second heat exchange zone. The first heat exchange zone exchanges heat with a first area of the electrode of the cell, and the second heat exchange zone exchanges heat with a second area of the cell except the first area. The heat exchange amount of the flow channel in the first heat exchange zone is higher than that of the flow channel in the second heat exchange zone. In this way, by adjusting the heat exchange amount of the heat exchange medium in the flow channel in the heat exchange zone, a targeted cooling scheme with different heat exchange degrees is formed for different heat generation areas such as the electrode area and the non-electrode area of the cell, so as to effectively improve the heat exchange efficiency and enhance the heat exchange effect. In addition, the heat exchange zones in the present application adopt an independent flow channel structure, which can effectively avoid problems such as backflow blockage and backflow difficulty, ensure the heat exchange efficiency and heat exchange effect, and ensure the long-term normal operation of the even-temperature plate, thereby reducing the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0041] Figure 1 A structural schematic diagram of the battery pack provided by the present application is shown in the figure.

[0042] Figure 2 A top view of the battery pack provided by the present application is shown in the figure. Figure 1

[0043] Figure 3 A schematic diagram of the internal structure of the even-temperature plate provided by the present application is shown in the figure.

[0044] Figure 4 A schematic diagram of the injection hole provided by the present application is shown in the figure.

[0045] Figure 5 A schematic diagram of the cold plate provided by the present application is shown in the figure.

[0046] In the figure, 1 represents the battery pack.

[0047] 10 represents the cell, and 20 represents the cell even-temperature device.

[0048] 21 represents the even-temperature plate, and 22 represents the cold plate.

[0049] 211 represents the first heat exchange zone, 212 represents the second heat exchange zone, 213 represents the flow channel, 214 represents the top plate, 215 represents the bottom plate, 216 represents the flow groove, 217 represents the injection hole, 221 represents the electrode cooling channel, and 222 represents the middle cooling channel.

[0050] 2111 represents the first sub-heat exchange zone, and 2112 represents the second sub-heat exchange zone.

[0051] ​The present application has been shown and described with reference to the preferred embodiments. Equivalent mechanisms and methods can be used as substitutes for those described and illustrated. The application is not limited to the examples disclosed herein, but can be used with many others. The scope of the application should be determined with reference to the appended claims, along with the full text of the patent to which the claims relate. DETAILED DESCRIPTION

[0052] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers represent the same elements throughout the several figures. The implementations set forth in the following description of exemplary embodiments do not represent all of the implementations consistent with the application. Instead, they are merely examples of apparatuses and methods consistent with aspects related to the application as recited in the appended claims.

[0053] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also possible in the present application that units operate as a common unit or units operate independently with some units. Furthermore, the use of the terms "first", "second", etc. do not imply any actual relationship or order between elements.

[0054] In addition, the terms "first", "second", etc. are used herein only to describe all of the possible combinations of elements; they are not used to limit the number of elements present. Accordingly, these terms are used herein only to describe a possible relationship (e.g., a first element can be substantially similar to a second element, a first element can be substantially different from a second element, etc.) and do not limit the scope of the application described in the claims to a single feature or implementation.

[0055] In the present application, unless explicitly specified and limited, the "on", "under", "above", and "over" of a first feature to a second feature can mean that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above", and "over" of a first feature to a second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0056] As described in the background technology, the temperature equalization device in the related art arranges a cold plate with a circulation pipeline inside on the surface of the battery cell. Since the internal volume of the cold plate in the battery pack is large and the cold plate is connected to the refrigerant, it is easy to cause the circulation pipeline to be blocked and unable to reflux, resulting in low heat exchange efficiency. In addition, as the refrigerant filling amount increases, additional liquid storage tanks need to be added, and each cold plate inlet and outlet needs to add an expansion valve for flow regulation, which has a complex structure and high cost. In addition, it is impossible to carry out targeted heat exchange for different heating areas of the battery cell, resulting in low temperature equalization efficiency and poor temperature equalization effect.

[0057] This application is based on the limitations of traditional battery cell heat exchange technology and the modern demand for high heat exchange efficiency of battery cells, and takes into account the technical defects of the current use of cold plate circulation pipelines as battery cell heat exchange structures, such as easy pipe clogging, difficult reflux, and poor heat exchange performance. This application proposes a temperature equalizing plate that adopts an independent cooling structure for each part of the battery cell and performs centralized cooling on the high-temperature electrode area of ​​the battery cell to improve the temperature equalization efficiency and temperature equalization effect. At the same time, the refrigerant filling volume is small, which can avoid reflux blockage, and the structure is simple and the cost is low.

[0058] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0059] refer to Figure 1 and Figure 2 The embodiment of the present application provides a temperature averaging plate, which is used to exchange heat and equalize the temperature of each battery cell in the battery pack. Figure 1 The vertical distribution structure shown. A plurality of flow channels 213 are formed within the temperature equalizer 21. The flow channels 213 contain a heat exchange medium. The flow channels 213 are independently distributed and not interconnected. Each flow channel 213 formed within the temperature equalizer 21 can be directly opened within the temperature equalizer 21 or embedded within the temperature equalizer 21. The heat exchange medium disposed within each flow channel 213 can be a phase change medium such as water or coolant.

[0060] Regarding the arrangement of the flow channel 213 inside the temperature plate 21, it can be set along the arrangement direction of the battery cells 10. In addition, the flow channel 213 can also be set obliquely to the arrangement direction of the battery cells 10, or perpendicular to the arrangement direction of the battery cells 10. The flow channel 213 is arranged from the electrode end of the battery cell 10 to the non-electrode end of the battery cell 10. It can be arranged on the entire heating surface of the battery cell 10, or it can be set only in the high heating area of ​​the electrode end of the battery cell 10. Regarding the specific structure of the flow channel 213, it can be Figure 1 、 Figure 2 andFigure 4 The flow channels in the first heat exchange area 211 and the second heat exchange area 212 can be straight flow channels or non-straight flow channels, such as curved flow channels, and the flow channels 213 are arranged in parallel or at an angle to each other. The cross-sectional diameter of the flow channels 213 can be uniform or variable. Since the flow channels 213 are independent of each other, each flow channel 213 is a closed flow channel. Therefore, the heat exchange medium can be pre-filled in each flow channel 213, or the heat exchange medium can be circulated in each flow channel 213. The heat exchange medium in each flow channel 213 can be the same or different, and the amount of heat exchange medium in each flow channel 213 can be the same or different. In this way, the heat exchange and cooling of different heat generation areas of the battery cell 10 can be targeted, so as to improve the uniform temperature efficiency and uniform temperature effect.

[0061] It should be noted that the size and arrangement of the flow channels 213 can be set according to actual needs to meet the heat exchange function, and the present disclosure does not limit the size and arrangement of the flow channels 213.

[0062] In the present embodiment, the uniform temperature plate 21 includes a first heat exchange area 211 and a second heat exchange area 212. The first heat exchange area 211 can be a region opposite to a first region of the battery cell 10, and the first region is a region including the electrode post. In this way, the first heat exchange area 211 can exchange heat with the electrode region and the region other than the electrode of the battery cell 10. The second heat exchange area 212 is a region opposite to a second region of the battery cell 10, and the second region can be a region other than the first region of the battery cell 10 (i.e., a non-electrode region). In this way, the second heat exchange area 212 can exchange heat with the non-electrode region of the battery cell 10.

[0063] It can be understood that, since the heat generation amounts of the electrode region and the non-electrode region are different, the different heat generation regions of the battery cell 10 need to be exchanged. Generally, the heat generation amount of the electrode region of the battery cell 10 is higher than that of the non-electrode region of the battery cell 10. Specifically, the heat generation amount of the first region including the electrode of the battery cell 10 is greater than that of the second region. Correspondingly, the heat exchange amount of the flow channels 213 arranged in the first heat exchange area 211 is higher than that of the flow channels 213 arranged in the second heat exchange area 212. Therefore, the first heat exchange area 211 and the second heat exchange area 212 need to have different heat exchange capacities to target the heat exchange of the different heat generation regions.

[0064] In the present disclosure, the uniform temperature plate 21 can be arranged at any position of the battery cell 10 that needs heat exchange, such as the top surface, the bottom surface, and the side surface of the battery cell 10, according to actual heat exchange needs. In order to improve the installation strength of the uniform temperature plate 21, the uniform temperature plate 21 can be fixedly installed with the battery cell 10. For example, the uniform temperature plate 21 can be fixed on the battery cell 10 by using a heat-conducting adhesive.

[0065] It should be noted that the "top surface of the battery cell" and the "bottom surface of the battery cell" in the present disclosure refer to the positions of the battery cell 10 shown in FIG. 1, i.e., the top surface and the bottom surface of the battery cell 10. Figure 1 Figure 1 ​The upper surface and the lower surface of the battery cell 10 shown in FIG. 1. In the present specification, the "arrangement direction of the battery cell" refers to the direction along which the battery cell 10 is arranged. Figure 1 and Figure 3 The horizontal direction shown in FIG. 1. In the present specification, the "first heat generation region" and the "second heat generation region" refer to the ranges of regions set according to the length of the battery cell 10, the heat exchange performance, and the like. In the present specification, the "first heat exchange region" and the "second heat exchange region" are regions set corresponding to the "first heat generation region" and the "second heat generation region", respectively, and the heat exchange regions can cover the corresponding part or all of the heat generation regions. In addition, in the present specification, the "center" specifically refers to Figure 1 the region near the central longitudinal section of the battery cell 10 shown in FIG. 1. In the following, the "width" refers to the direction along the Figure 1 the short side direction of the battery cell 10 shown in FIG. 1, and the "height" refers to the direction along the Figure 1 the vertical direction in FIG. 1.

[0066] In the present embodiment, on the basis that the battery cell 10 has at least two heat generation regions, i.e., the first heat generation region and the second heat generation region, of different heat generation amounts, the uniform temperature plate 21 is divided into at least two independent first heat exchange region 211 and second heat exchange region 212, the first heat exchange region 211 exchanges heat with the electrode of the battery cell 10, the second heat exchange region 212 exchanges heat with the other regions of the battery cell 10 except the electrode, and by adjusting the heat exchange amount of the heat exchange medium in the flow channel 213 arranged in the first heat exchange region 211 and the second heat exchange region 212, the heat exchange performance of the first heat exchange region 211 and the second heat exchange region 212 can be precisely controlled, and a cooling scheme with different heat exchange degrees can be formed for the electrode region and the non-electrode region of the battery cell 10, which matches the heat exchange demand of the first heat generation region and the second heat generation region of the battery cell 10, thereby ensuring the temperature uniformity of the first heat generation region and the second heat generation region of the battery cell 10, and effectively improving the heat exchange efficiency and the heat exchange effect.

[0067] In addition, the present scheme adopts a closed and independent flow channel 213 distribution structure, which can independently cool each part of the battery cell 10 according to the different heat exchange demands of each part, which helps to improve the heat exchange effect. Since the flow channel 213 is independently arranged, compared with the connected flow channel structure on the market, the overall internal volume of the flow channel 213 is small, and the refrigerant charge amount is small, which can avoid problems such as oil channel blockage and difficult backflow, and the heat exchange efficiency and the heat exchange effect are significantly improved. In addition, the heat exchange medium accommodated in the flow channel 213 in the present application is a phase change medium, and the flow channel 213 realizes uniform temperature through the phase change of the internal phase change medium to ensure the uniform temperature efficiency and the uniform temperature effect.

[0068] The uniform temperature plate provided in the application can adjust the heat exchange amount of the first heat exchange area 211 and the second heat exchange area 212 according to the heat exchange demand of each heat generation area of the battery cell 10, so as to accurately match the heat exchange demand of each heat generation area, and then accurately control the heat exchange performance of the first heat exchange area 211 and the first heat exchange area 211, form a cooling scheme with different heat exchange degrees for the electrode area and the non-electrode area of the battery cell, and improve the heat exchange efficiency.

[0069] In view of the high heat generation of the electrode area of the battery cell 10 and the low heat generation of the non-electrode area, and the heat gradually decreases from the electrode area to the non-electrode area, the application can adjust the heat exchange amount of the heat exchange medium in the flow channel 213, set the heat exchange amount of the flow channel 213 to gradually decrease along the direction from the first heat exchange area 211 to the second heat exchange area 212, so as to match the heat exchange demand of different heat generation areas by using the heat exchange amount, and realize the uniform temperature of the battery cell 10.

[0070] It should be noted that the gradually decreasing heat exchange amount in the application can be linearly changed, and can be gradually decreased as a whole, but the heat exchange amount of part of the adjacent flow channels can be equal.

[0071] The heat exchange amount in the application can be represented by the flow rate, flow speed, filling amount and heat transfer temperature difference of the heat exchange medium. For example, the heat exchange rate between the fluid and the surface of the uniform temperature plate can be changed by adjusting the flow speed of the heat exchange medium, and then the heat transfer coefficient of the flow channel can be changed. In addition, the heat transfer coefficient can also be changed by changing the heat transfer temperature difference of the heat exchange medium. In addition, the heat exchange amount can also be represented by the structural parameters of the uniform temperature plate, such as the arrangement density of the flow channel 213, the distance between the flow channels 213, and the shape and size of the flow channel 213. In addition, the heat exchange performance of the uniform temperature plate can also be changed by adding heat exchange structures outside or inside the flow channel 213, such as adding heat dissipation fins and other heat dissipation structures.

[0072] The heat exchange amount described above can be represented by the arrangement density. For example, according to the different heat exchange demands of each part of the battery cell 10, the flow channel 213 is arranged in the uniform temperature plate 21, and the arrangement density of the flow channel 213 in the high heat generation area is large, and the arrangement density of the flow channel 213 in the low heat generation area is small, so as to realize the partition cooling of the battery cell 10.

[0073] In view of the fact that the heat generation of the electrode end of the battery cell 10 is higher than the heat generation of the middle part of the battery cell 10, the arrangement density of the flow channel 213 in the first heat exchange area 211 and the second heat exchange area 212 can be adjusted, so that the arrangement density of the flow channel 213 in the first heat exchange area 211 is greater than the arrangement density of the flow channel in the second heat exchange area 212, thereby independently cooling each heat generation area of the battery cell 10.

[0074] In other words, the flow channels 213 are arranged in a dense distribution in the first heat exchange region and a sparse distribution in the second heat exchange region. The flow channels 213 arranged in the first heat exchange region 211 corresponding to the electrode end have a higher arrangement density than the flow channels 213 arranged in the second heat exchange region 212. In this embodiment, the flow channels 213 can or can not be arranged in the second heat exchange region 212.

[0075] Since the heat generation of the battery cell 10 gradually decreases from the electrode end to the non-electrode end, the arrangement density of the flow channels 213 in the first heat exchange region 211 and the second heat exchange region 212 can be gradually decreased from the first heat exchange region 211 to the second heat exchange region 212 to meet the heat exchange requirements.

[0076] Further, the heat generation of the electrode end corresponding to the first heat exchange region 211 is greater than the heat generation of the non-electrode end corresponding to the second heat exchange region 212. Therefore, the number of flow channels 213 corresponding to the first heat exchange region 211 is greater than the number of flow channels 213 corresponding to the second heat exchange region 212. The number of flow channels 213 corresponding to the first end of the battery cell 10 can be equal to or different from the number of flow channels 213 corresponding to the negative electrode end. The cross-sectional area of the flow channels in the first heat exchange region 211 is greater than the cross-sectional area of the flow channels in the second heat exchange region 212. The cross-sectional area of the flow channels 213 can gradually decrease from the first heat exchange region 211 to the second heat exchange region 212. Such a flow channel 213 structure, based on the above-mentioned gradual sparse distribution of the flow channels 213 from both ends to the center, further forms an arrangement structure in which the cross-sectional area of the flow channels 213 in the first heat exchange region 211 is large and gradually decreases in the direction of the second heat exchange region 212, thereby further improving the heat exchange efficiency and enhancing the heat exchange effect.

[0077] Further, the flow rate of the heat exchange medium in the flow channels 213 can be controlled to obtain a desired heat exchange effect. The flow rate of the flow channels 213 in the first heat exchange region 211 is greater than the flow rate of the flow channels 213 in the second heat exchange region 212, and the flow rate of the flow channels 213 gradually decreases from the first heat exchange region 211 to the second heat exchange region 212, thereby balancing the heat exchange performance of each flow channel 213 and helping to maintain the uniformity of the overall temperature of the battery cell 10, thereby improving the reliability and stability of the vapor chamber 21.

[0078] In addition, the present application can adjust the heat exchange amount by adjusting the filling amount of the heat exchange medium in the flow channel 213. According to the heat exchange law of the above-mentioned battery cell 10, the filling amount inside the flow channel 213 corresponding to the first heat exchange zone 211 is set to be greater than the filling amount of the flow channel 213 corresponding to the second heat exchange zone 212, and the filling amount of each flow channel 213 gradually decreases from the first heat exchange zone 211 to the second heat exchange zone 212. In order to facilitate the circulation of the evaporated gas in each flow channel 213, a certain cavity should be reserved in the flow channel 213 to provide an environment for the heat exchange medium to complete the phase change, thereby improving the heat exchange efficiency and heat exchange effect.

[0079] Exemplarily, the filling amount of the heat exchange medium in each flow channel 213 is 40% to 80% of the cavity volume of the flow channel 213. When the filling amount in the flow channel is less than 40%, the filling amount of the heat exchange medium is small, and it is difficult to have enough heat exchange medium to complete the phase change heat exchange, which affects the heat exchange effect with the battery cell. When the filling amount in the flow channel 213 is greater than 80%, the filling amount of the heat exchange medium is large, and the space in the flow channel for the heat exchange medium to undergo phase change is small, resulting in the heat exchange medium being difficult to complete a sufficient phase change process, which also affects the heat exchange effect with the battery cell. Therefore, the present application sets the filling amount of the heat exchange medium in each flow channel 213 to between 40% and 80% of the cavity volume of the flow channel 213, which not only ensures that there is enough heat exchange medium to complete the phase change heat exchange, but also ensures that there is enough space in the flow channel for the heat exchange medium to complete the phase change. In this way, the heat exchange effect with the battery cell 10 can be effectively improved. Optionally, the filling volume in each flow channel 213 accounts for 50%, 60% or 70%.

[0080] It should be noted that the filling amount or flow rate of the heat exchange medium in the flow channel 213 can be arbitrarily adjusted according to the actual heat exchange area or heat exchange temperature.

[0081] In the above-described embodiment of the present application, corresponding to the positive and negative poles of the battery cell 10, the above-described first heat exchange zone 211 can be divided into a first sub-heat exchange zone 2111 and a second sub-heat exchange zone 2112. The first sub-heat exchange zone 2111 and the second sub-heat exchange zone 2112 are respectively located at the two ends of the extension direction of the temperature averaging plate 214, and the second heat exchange zone 212 is located in the middle of the extension direction of the temperature averaging plate 21. The first sub-heat exchange zone 2111 corresponds to and exchanges heat with the first end of the battery cell 10, and the second sub-heat exchange zone 2112 corresponds to and exchanges heat with the second end of the battery cell 10, wherein the first end can be the positive electrode region of the battery cell 10, and the second end can be the negative electrode region of the battery cell 10. It should be noted that the middle portion can be understood as the middle region between the first sub-heat exchange zone 2111 and the second sub-heat exchange zone 2112.

[0082] Exemplarily, along the extending direction of the uniform temperature plate 21, the arrangement density of the flow channels 213 gradually decreases from the two ends to the middle part, so as to form a cooling structure in which the arrangement density of the flow channels 213 gradually decreases from the positive and negative electrode ends of the battery cell 10 to the middle part. In the above direction, the cross-sectional area of the flow channels 213 gradually decreases, the flow rate of the flow channels 213 gradually decreases, and the filling amount of the flow channels 213 gradually decreases.

[0083] The gap d between the adjacent two flow channels 213 in the first heat exchange area 211 corresponding to the first end of the battery cell 10 is 5mm-10mm. When the gap d between the adjacent two flow channels 213 is less than 5mm, the gap between the flow channels 213 is too small, the heat exchange performance difference between the flow channels 213 is small, the partition cooling effect is not obvious, the heat exchange effect is affected, and the processing difficulty is large and the processing cost is high. When the gap between the adjacent flow channels 213 is greater than 10mm, the heat exchange coverage is low, and a large area of heat exchange blind area will appear, which cannot meet the heat exchange performance of the high temperature area, and the heat exchange effect is poor.

[0084] The gap d of the first heat exchange flow channel 213 corresponding to the second end of the battery cell 10 is 5mm-10mm. The gap d of the flow channel 213 corresponding to the middle heat exchange area of the battery cell 10 is 5mm-20mm. When the gap between the adjacent flow channels 213 is less than 5mm, the gap is too small, the heat exchange performance of the flow channel is greater than the heat exchange demand of the middle region, so that the temperature of the region decreases rapidly, and even lower than the temperature of the positive and negative electrode regions of the battery cell 10, which leads to supercooling and is not conducive to temperature equalization.

[0085] Taking a rectangular cross section as an example, the width value of the flow channel 213 is 10mm-50mm, and the height value of the flow channel 213 is 1.5mm-3.5mm, for example, the height value can be 2mm, 2.8mm, 3mm. When the width value is less than 10mm and / or the height value is less than 1.5mm, the cross-sectional area of the flow channel will be too small, the amount of heat exchange medium filled will be small, the cooling effect will be poor, and the processing will be difficult, and the processing cost will be high. When the width value is greater than 50mm and / or the height value is greater than 3.5mm, the flow channel size is too large, which causes material waste and increases the cost of the uniform temperature plate 21. Therefore, the heat exchange performance of the uniform temperature plate 21 in the above interval value range is better.

[0086] As shown in FIG. 1, the uniform temperature plate 21 includes a top plate 214 and a bottom plate 215. The top plate 214 is internally provided with a plurality of flow grooves 2141, and the bottom plate 215 is a plate-shaped structure. The top plate 214 is fixedly connected with the top surface of the bottom plate 215, so that each flow channel 213 is formed by the cooperation of each flow groove 2141 and the top surface of the bottom plate 215, and the flow channels 213 are independently distributed and do not flow into each other. Figure 3 As shown in FIG. 1, the uniform temperature plate 21 includes a top plate 214 and a bottom plate 215. The top plate 214 is internally provided with a plurality of flow grooves 2141, and the bottom plate 215 is a plate-shaped structure. The top plate 214 is fixedly connected with the top surface of the bottom plate 215, so that each flow channel 213 is formed by the cooperation of each flow groove 2141 and the top surface of the bottom plate 215, and the flow channels 213 are independently distributed and do not flow into each other.

[0087] In addition, a liquid injection hole 217 is provided on the top plate 214. Figure 4 As shown, the number of injection holes 217 is arranged in the same number as the flow grooves 2141, and each injection hole 217 is connected to its corresponding flow groove 2141. Figure 4 A separate injection hole 217 is provided on the top plate 214 corresponding to each flow channel 213. The injection hole 217 is located on the surface of the flow channel 213, near the end of the flow channel 213. Each flow channel 213 needs to be injected with a highly heat-absorbing liquid material, and the evaporation temperature of the liquid material can be selected to be above 45°C.

[0088] Furthermore, a liquid injection hole cover may be provided at each liquid injection hole 217 . After the liquid heat exchange medium is filled, the liquid injection hole 217 is welded and fixed using the liquid injection hole cover to prevent the liquid from flowing out of the liquid injection hole 217 .

[0089] Regarding the specific structure of the thermostat 21, in another specific embodiment, the thermostat 21 can also be a harmonica cooling tube. The harmonica cooling tube includes a harmonica tube and two end caps. The two ends of the harmonica tube are non-closed tube structures with independent flow channels 213 inside. The end cap at one end is pre-sealed and installed on one end of the harmonica tube. The other end is used for liquid injection. After the liquid injection is completed, the end cap is sealed and fixed to the end cap, thereby forming a closed flow channel 213. This structure eliminates the need for a separate liquid injection structure, which can save costs. In addition, by selecting a high heat transfer material to make the harmonica cooling tube, a better heat transfer effect can be achieved.

[0090] On the basis of the above embodiment, in addition to using the thermostat 21 to cool the battery cell 10, a cold plate 22 may be used for heat exchange, or a thermostat 21 combined with a cold plate 22 may be used for heat exchange. Figure 5 Specifically, the cold plate 22 is provided with an electrode cooling channel 221 and a central cooling channel 222. The electrode cooling channel 221 is provided in the first region corresponding to the positive and negative ends of the battery cell 10, and the central cooling channel 222 is provided in the second region in the middle of the battery cell 10. The electrode cooling channel 221 and the central cooling channel 222 are both connected to the external circulating heat exchange medium through their respective interfaces to achieve cooling of the first and second regions of the battery cell 10.

[0091] In other words, the cold plate 22 and the temperature equalizing plate 21 are arranged on opposite surfaces of the battery cell, for example, the cold plate 22 can be arranged on the top surface or the bottom surface of the battery cell 10, and the temperature equalizing plate 21 is arranged on the bottom surface or the top surface of the battery cell 10 opposite to the surface on which the cold plate is arranged. The cold plate 22 has two cooling channels, the electrode cooling channel 221 is arranged in the positive electrode area and the negative electrode area of the battery cell 10, which includes a plurality of parallel pipes and connecting pipes connected to both ends of the parallel pipes, and the other end of the connecting pipe is connected to a joint. The heat exchange medium is circulated into the connecting pipe through the joint, flows through the positive electrode and the negative electrode, and flows back from the other joint, thereby achieving heat exchange of the positive electrode area and the negative electrode area. The middle cooling channel 222 covers the other area of the battery cell 10 except the positive electrode and the negative electrode, which includes a plurality of parallel pipes and connecting pipes at both ends. The heat exchange medium is circulated into the connecting pipe at one end through the joint, and flows back from the other joint after flowing through each pipe, thereby forming heat exchange of the preset area in the middle of the battery cell 10.

[0092] In the present scheme, a valve is arranged on the connecting pipe, which can be a manual valve or an electromagnetic valve. When a manual valve is used, the valve opening can be manually adjusted to adjust the flow size. When an electromagnetic valve is used, the valve opening can be automatically adjusted by comparing the flow value of the cooling channel 213 detected by the sensor with the preset flow value through the external control system, thereby realizing automatic adjustment of the flow size and being more accurate and efficient. Since the electrode cooling channel 221 cools the high-heat-generating position of the positive electrode and the negative electrode of the battery cell 10, and the middle cooling channel 222 is used to cool the low-heat-generating position in the middle of the battery cell 10, the temperature difference of the same plane of the battery cell 10 can be controlled by controlling the flow in the two cooling channels.

[0093] The present application can arrange the cold plate 22 on the top surface or the bottom surface of the battery cell 10, and arrange the temperature equalizing plate 21 on the other surface, thereby reducing the temperature difference in the height direction of the battery cell 10, thereby meeting the heat exchange demand of the whole battery cell 10.

[0094] For example, under normal circumstances, the liquid material in the thermostat 21 does not undergo a phase change. When the heat generation of the battery cell 10 begins to increase sharply, the cold plate 22 is turned on for cooling. First, cooling can be provided to the electrode cooling channel 221, and no or a small amount of cooling can be provided to the central cooling channel 222. When the temperature of the battery cell 10 reaches a preset temperature value, such as 45°C, the temperature in the middle of the battery cell 10 gradually rises. At this time, the flow rate in the central cooling channel 222 can be increased, and the flow rate in the electrode cooling channel 221 can be reduced. At the same time, the thermostat 21 located on the other side of the cold plate 22 begins to work, and the liquid material begins to evaporate and absorb heat, removing heat from the surface of the battery cell 10, thereby lowering the temperature of the battery cell 10. When the battery cell 10 gradually stops generating heat, the temperature of the battery cell 10 begins to drop. The gaseous material in the flow channel 213 contacts the channel wall and begins to condense into liquid material, and the thermostat 21 begins a new cooling cycle. This can enhance the heat exchange and cooling effect on the battery cell 10.

[0095] In addition, the present application can also arrange temperature averaging plates 21 on both opposite surfaces of the battery cell or arrange cold plates 22 on both sides. The cold plates 22 in the present application can adopt commercially available dual-control cold plates 22, which are easy to obtain, have stable and reliable heat exchange performance, and are low in cost.

[0096] In summary, the temperature equalizing plate provided in the embodiment of the present application can be arranged in the heat exchange area of ​​the battery cell 10. A plurality of independently distributed flow channels 213 are provided in the temperature equalizing plate 21, and a phase change medium is passed through the flow channels 213. Moreover, the heat exchange capacity, such as the gap between each independent flow channel 213, the flow channel width, the flow channel height, the amount of medium inside the flow channel, etc. can be flexibly adjusted according to the heat exchange requirements of the heating zone of the battery cell 10, thereby matching the heat exchange requirements of different heating areas of the battery cell 10 and achieving targeted cooling.

[0097] An embodiment of the present application provides a battery cell temperature equalizing device, comprising the temperature equalizing plate described in any of the above embodiments. The battery cell temperature equalizing device 20 can perform heat exchange on the battery cell to adjust the battery cell temperature.

[0098] Since the battery cell temperature balancing device 20 includes the above-mentioned temperature balancing plate 21 in this embodiment, and thus has the structure and beneficial effects of the temperature balancing plate 21 , this embodiment will not be described in detail.

[0099] The battery cell temperature equalization device in this application can achieve heat exchange and temperature equalization of heating components such as battery cells.

[0100] The present application also provides a battery pack, please continue to refer to Figure 1 , including a plurality of battery cells 10 arranged side by side and the above-mentioned battery cell temperature equalizing device 20.

[0101] The battery pack 1 has the above-mentioned battery cell temperature equalizing device 20, so that it has better heat exchange performance, thereby having stable and reliable performance and a longer service life.

[0102] The use electric device in the embodiments of the present application can be a vehicle, for example: the vehicle can be a fuel automobile, a gas automobile or an electric automobile, and the electric automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. Correspondingly, the use electric device can be a driving mechanism of the vehicle, or a control system of the vehicle.

[0103] The use electric device in the embodiments of the present application can be a vehicle, for example: the vehicle can be a fuel automobile, a gas automobile or an electric automobile, and the electric automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. Correspondingly, the use electric device can be a driving mechanism of the vehicle, or a control system of the vehicle.

[0104] In addition, the use electric device can also be other energy storage devices, such as a mobile phone, a portable device, a notebook computer, an electric toy, an electric tool, a ship and a spacecraft, etc., wherein the spacecraft can include an airplane, a rocket, a space shuttle or a spaceship.

[0105] In view of the fact that the use electric device in the embodiments of the present application includes the battery pack described in any of the above embodiments, the use electric device includes the battery pack structure and the advantages thereof, and the embodiments will not be described here.

[0106] Further, in order to effectively reduce the overall size of the battery pack, the cell uniform temperature device 20 can be installed in an integrated structure. Specifically, the cell uniform temperature device 20 can be integrated in the shell and / or integrated in the sealing cover, forming an integrated mounting structure. When the shell or the sealing cover is produced and processed, the cell uniform temperature device 20 is arranged inside, so that the cell uniform temperature device 20 does not need to be assembled separately, the processing efficiency can be improved, the installation space can be saved, and the overall size of the battery pack can be reduced.

[0107] In combination with the above embodiments, the above-mentioned uniform temperature device 21 and cold plate 22 can be integrated in the corresponding sealing cover or shell, or the flow channel 213 structure of the uniform temperature device 21 and cold plate 22 can be arranged in the sealing cover or shell and assembled with the cell 10 to form a battery pack 1 with an internal cooling structure.

[0108] In addition, the present application also provides a use electric device, such as an electric vehicle, a new energy vehicle, etc. The use electric device includes the above-mentioned battery pack. The use electric device is stable and reliable in performance, and high in safety.

[0109] In addition, the use electric device provided by the present application can ensure that the use electric device can always maintain when running at high performance, thereby prolonging the service life of the use electric device and reducing the use cost of the user.

[0110] It should be understood that many of the materials and devices exemplified in this disclosure are articles of manufacture (i.e., articles of manufacture) according to this disclosure. The articles of manufacture can be manufactured as such or can be manufactured by combining the materials and devices exemplified in this disclosure. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It should be understood that, in some embodiments, equivalents to the specific electrode structures and / or methods described herein can be employed without departing from the scope of the application. Accordingly, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," "having," "containing," "involving," "characterized by," "characterized into," and variations thereof herein, is meant to encompass the items listed thereafter, and equivalents thereof as well as additional items. Although the foregoing application has been described in some detail by way of illustration and example, it is not to be limited thereby, but rather, only by the scope of the appended claims.

Claims

1. A temperature equalizing plate, characterized in that: Used for heat exchange and temperature equalization of the battery core (10), a plurality of mutually unconnected flow channels (213) are formed in the temperature equalization plate (21), and a heat exchange medium is placed in the flow channels (213); The temperature homogenizing plate (21) comprises a first heat exchange area (211) and a second heat exchange area (212), wherein the first heat exchange area (211) is used to be opposite to and exchange heat with a first area of ​​the battery cell (10), and the second heat exchange area (212) is used to be opposite to and exchange heat with a second area of ​​the battery cell (10) other than the first area, and the heat generation of the first area is higher than the heat generation of the second area; The heat exchange capacity of the flow channel (213) of the first heat exchange zone (211) is higher than the heat exchange capacity of the flow channel (213) of the second heat exchange zone (212); Along the direction from the first heat exchange zone (211) to the second heat exchange zone (212), the heat exchange capacity of the flow channel (213) gradually decreases.

2. The temperature vapor chamber according to claim 1, wherein: The arrangement density of the flow channels (213) in the first heat exchange zone (211) is greater than the arrangement density of the flow channels (213) in the second heat exchange zone (212).

3. The temperature vapor chamber according to claim 1, wherein: Along the direction from the first heat exchange zone (211) to the second heat exchange zone (212), the arrangement density of the flow channels (213) gradually decreases.

4. The temperature vapor chamber according to claim 1, wherein: The cross-sectional area of ​​the flow channel of the first heat exchange zone (211) is greater than the cross-sectional area of ​​the flow channel of the second heat exchange zone (212).

5. The temperature vapor chamber according to claim 4, wherein: Along the direction from the first heat exchange zone (211) to the second heat exchange zone (212), the cross-sectional area of ​​the flow channel (213) gradually decreases.

6. The temperature vapor chamber according to claim 1, wherein: The flow rate of the flow channel (213) of the first heat exchange zone (211) is greater than the flow rate of the flow channel (213) of the second heat exchange zone (212).

7. The temperature vapor chamber according to claim 6, wherein: Along the direction from the first heat exchange zone (211) to the second heat exchange zone (212), the flow rate of the flow channel (213) gradually decreases.

8. The temperature vapor chamber according to claim 1, wherein: The first heat exchange zone (211) comprises a first sub-heat exchange zone (2111) and a second sub-heat exchange zone (2112), wherein the first sub-heat exchange zone (2111) corresponds to and exchanges heat with the first end of the battery core (10), and the second sub-heat exchange zone (2112) corresponds to and exchanges heat with the second end of the battery core (10).

9. The temperature vapor chamber according to claim 8, wherein: The heat exchange capacity of the flow channel (213) of at least one of the first sub-heat exchange zone (2111) and the second sub-heat exchange zone (2112) is higher than the heat exchange capacity of the second heat exchange zone (212).

10. The temperature vapor chamber according to claim 8, wherein: The first sub-heat exchange zone (2111) and the second sub-heat exchange zone (2112) are respectively located at two ends of the extension direction of the temperature equalizing plate (21), and the second heat exchange zone (212) is located in the middle of the extension direction of the temperature equalizing plate (21).

11. The temperature vapor chamber according to any one of claims 1 to 10, characterized in that: The plurality of flow channels (213) are arranged at intervals.

12. The temperature vapor chamber according to claim 11, wherein: The flow channel (213) is a closed flow channel, and a plurality of the flow channels (213) are independently arranged.

13. The temperature vapor chamber according to claim 12, wherein: The gap between adjacent flow channels (213) in the first heat exchange zone (211) is 5 mm to 10 mm; And / or, the gap between adjacent flow channels (213) in the second heat exchange zone (212) is 5 mm to 20 mm.

14. The temperature vapor chamber according to any one of claims 1 to 10, characterized in that: The cross section of the flow channel (213) is rectangular, the width of the flow channel (213) is 10 mm to 50 mm, and the height of the flow channel (213) is 1.5 mm to 3.5 mm.

15. The temperature vapor chamber according to any one of claims 1 to 10, characterized in that: The temperature-averaging plate (21) is a harmonica tube provided with a plurality of closed flow channels (213), and the plurality of harmonica tubes are independently distributed.

16. The temperature vapor chamber according to any one of claims 1 to 10, characterized in that: The temperature equalizing plate (21) includes a bottom plate (215) and a top plate (214); The top plate (214) is provided with a plurality of flow grooves (2141), the bottom plate (215) is relatively connected to the top plate (214), and the bottom plate (215) covers the flow grooves (2141) to form the flow channel (213).

17. The temperature vapor chamber according to claim 16, wherein: The top plate (214) is provided with injection holes (217) whose number is equal to the number of the flow grooves (2141), and each of the injection holes (217) is distributed and communicated with each of the flow grooves (2141) in a one-to-one correspondence.

18. The temperature vapor chamber according to any one of claims 1 to 10, characterized in that: The filling amount of the flow channel (213) of at least one of the first sub-heat exchange zone (2111) and the second sub-heat exchange zone (2112) is higher than the filling amount of the second heat exchange zone (212).

19. The temperature vapor chamber according to claim 18, wherein: The filling amount of the heat exchange medium in the flow channel (213) is 40% to 80% of the cavity volume of the flow channel (213).

20. The temperature vapor chamber according to any one of claims 1 to 10, characterized in that: The heat exchange medium is a phase change medium.

21. A battery cell temperature equalizing device, characterized in that: The heat absorbing plate (21) comprises the heat absorbing plate (21) according to any one of claims 1 to 20.

22. The battery cell temperature equalizing device according to claim 21, characterized in that: There are two temperature averaging plates (21), and the two temperature averaging plates (21) are respectively arranged on two opposite surfaces of the battery core (10).

23. The battery cell temperature equalizing device according to claim 21, characterized in that: The battery cell temperature equalization device further comprises a cold plate (22), wherein an electrode cooling channel (221) and a middle cooling channel (222) are provided inside the cold plate (22); The electrode cooling channel (221) is used to be opposite to the first region of the battery core (10) and to exchange heat, and the middle cooling channel (222) is used to be opposite to the second region of the battery core (10) and to exchange heat; The cold plate (22) and the temperature equalizing plate (21) are respectively arranged on two opposite surfaces of the battery core (10).

24. A battery pack, characterized in that: The invention comprises a plurality of battery cells (10) and the battery cell temperature equalizing device according to any one of claims 1 to 23, wherein the battery cell temperature equalizing device is installed on the battery cells (10).

25. The battery pack according to claim 24, characterized in that: It includes a sealing cover and a shell, the battery core is installed in the shell, the sealing cover is covered on the shell, and the battery core is located between the shell and the sealing cover; The battery core temperature equalizing device (20) is built into the sealing cover and / or the housing.

26. An electrical device, characterized in that: A battery pack comprising the battery pack described in claim 24 or 25.

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