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

Abstract

The embodiment of the invention provides a temperature equalizing plate, a battery cell temperature equalizing device, a battery pack and electric equipment, and relates to the technical field of energy storage. The temperature equalizing plate is used for heat exchange and temperature equalization of a battery cell, a plurality of flow channels which are not communicated with one another are formed in the temperature equalizing plate, and heat exchange media are contained 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 a second area except the first area of the battery cell and exchanging heat, and the second heat exchange area is used for being opposite to an area except the electrode in the battery cell and exchanging heat; the calorific value of the first zone is higher than that of the second zone; 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. According to the uniform temperature plate, cooling schemes with different heat exchange degrees can be formed according to different heating areas of the battery cell, and the heat exchange efficiency and the heat exchange effect are improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a temperature averaging plate, a battery cell temperature averaging device, a battery pack and electrical equipment. Background Art

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

[0003] At present, the cold plate of the battery on the market is directly connected to the air conditioning system of the electric vehicle, so that the refrigerant of the air conditioning system circulates directly in the circulation pipeline inside the cold plate. However, the fast charging process of the battery causes the heat generation of the battery cell to increase sharply. The current cooling method of circulating the refrigerant in the cold plate pipeline can no longer meet the cooling needs of the system, resulting in low efficiency and poor temperature balancing effect for the battery. Summary of the invention

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

[0005] In a first aspect, an embodiment of the present application provides a temperature averaging plate for heat exchange and temperature averaging of a battery cell, wherein a plurality of unconnected flow channels are formed in the temperature averaging plate, and a heat exchange medium is placed in the flow channels;

[0006] The temperature plate includes a first heat exchange area and a second heat exchange area, the first heat exchange area is used to be opposite to and exchange heat with the first area of ​​the battery cell, the second heat exchange area is used to be opposite to and exchange heat with the second area of ​​the battery cell other than the first area, and the heat generation of the first area is higher than the heat generation of the second area;

[0007] The heat exchange amount of the flow channel in the first heat exchange zone is higher than the heat exchange amount of the flow channel in the second heat exchange zone.

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

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

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

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

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

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

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

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

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

[0017] In a possible implementation, the first sub-heat exchange zone and the second sub-heat exchange zone are respectively located at two ends of the extending direction of the temperature averaging plate, and the second heat exchange zone is located in the middle of the extending direction of the temperature averaging plate.

[0018] In a possible implementation manner, a plurality of the flow channels are arranged at intervals.

[0019] In a possible implementation manner, the flow channel is a closed flow channel, and a plurality of the flow channels are independently arranged.

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

[0021] And / or, the gap between adjacent flow channels in the second heat exchange zone is 5 mm to 20 mm.

[0022] In a possible implementation manner, 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 temperature uniformity plate is a harmonica tube provided with a plurality of closed flow channels, and the plurality of harmonica tubes are independently distributed.

[0024] In a possible implementation, the temperature homogenizing plate includes a bottom plate and a top plate;

[0025] The top plate is provided with a plurality of flow grooves, the bottom plate is buckled and connected with the top plate, and the bottom plate covers the flow grooves to form the flow channel.

[0026] In a possible implementation manner, the top plate is provided with injection holes whose number is equal to the number of the flow grooves, and each of the injection holes is distributed and connected with each of the flow grooves in a one-to-one correspondence.

[0027] In a possible implementation manner, the filling amount of the flow channel 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 manner, the filling amount of the heat exchange medium in the flow channel is 40% to 80% of the cavity volume of the flow channel.

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

[0030] In a second aspect, an embodiment of the present application provides a battery cell temperature equalization device, including the above-mentioned battery pack.

[0031] In a possible implementation manner, the number of the temperature averaging plates is two, and the two temperature averaging plates are respectively disposed on two opposite surfaces of the battery core.

[0032] In a possible implementation manner, a cold plate is further included, wherein an electrode cooling channel and a middle cooling channel are arranged inside the cold plate;

[0033] The electrode cooling channel is used to be opposite to the first area of ​​the battery core and to exchange heat, and the middle cooling channel is used to be opposite to the second area of ​​the battery core and to exchange heat;

[0034] The cold plate and the temperature equalizing plate are respectively arranged on two opposite surfaces of the battery core.

[0035] In a third aspect, an embodiment of the present application provides a battery pack, comprising a plurality of battery cells and a battery cell temperature equalizing device as described in any one of the above items, wherein the battery cell temperature equalizing device is installed on the battery cells.

[0036] In a possible implementation, the battery comprises a sealing cover and a shell, wherein the battery cell is mounted on the shell, the sealing cover is covered on the shell, and the battery cell is located between the shell and the sealing cover;

[0037] The battery core temperature equalizing device is built in the sealing cover and / or the shell.

[0038] In a third aspect, an embodiment of the application provides an electrical device, including the battery pack described above.

[0039] The embodiments of the present application provide a temperature averaging plate, a battery cell temperature averaging device, a battery pack, and an electrical device. A plurality of flow channels that are not interconnected and are independently distributed are formed in the temperature averaging plate. A heat exchange medium is contained in the flow channels. The temperature averaging plate includes a first heat exchange zone and a second heat exchange zone. The first heat exchange zone exchanges heat with the first zone of the battery cell including the electrode, and the second heat exchange zone exchanges heat with the second zone of the battery cell other than the first zone. The heat exchange amount of the flow channel in the first heat exchange zone is higher than the heat exchange amount of the flow channel in the second heat exchange zone. Thus, by adjusting the heat exchange amount of the heat exchange medium in the flow channel in the heat exchange zone, a cooling scheme with different heat exchange degrees and targeting is formed for different heating zones such as the electrode zone and the non-electrode zone of the battery cell, thereby effectively improving the heat exchange efficiency and the heat exchange effect. In addition, in the present application, each heat exchange zone adopts an independent flow channel structure, which can effectively avoid the problems of reflux blockage and reflux difficulty, ensure the heat exchange efficiency and heat exchange effect, and ensure the normal operation of the temperature averaging plate for a long time, thereby reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0041] Figure 1 A schematic diagram of the structure of the battery pack provided for this application;

[0042] Figure 2 for Figure 1 A top view of

[0043] Figure 3 A schematic diagram of the internal structure of the temperature homogenizing plate provided in this application;

[0044] Figure 4 A schematic diagram of the injection hole provided in this application;

[0045] Figure 5 Schematic diagram of a cold plate provided for this application.

[0046] Among them, 1-battery pack;

[0047] 10-battery cell, 20-battery cell temperature equalizing device;

[0048] 21-average temperature plate, 22-cold plate;

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

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

[0051] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0052] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0053] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", "front", "rear" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is smaller in level than the second feature.

[0056] As described in the background technology, the temperature equalization device in the related technology arranges a cold plate with a circulation pipeline inside on the surface of the battery cell. Since the cold plate in the battery pack has a large internal volume 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 amount of refrigerant filling increases, additional liquid storage tanks are required, 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 perform targeted heat exchange on 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 blockage, difficult reflux, and poor heat exchange performance. This application proposes a temperature averaging plate, which 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 averaging efficiency and temperature averaging effect. At the same time, the refrigerant filling amount is small, which can avoid reflux blockage, and the structure is simple and the cost is low.

[0058] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are 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 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 present application embodiment 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 in the temperature equalizing plate 21. The flow channels 213 contain heat exchange medium, and the flow channels 213 are independently distributed and not interconnected. Each flow channel 213 formed inside the thermostatic 21 can be directly opened inside the thermostatic 21 or embedded inside the thermostatic 21. The heat exchange medium arranged inside 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 arranged along the arrangement direction of the battery cells 10. In addition, the flow channel 213 can also be arranged 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 only set 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 and Figure 4 The linear flow channel in the flow channel may also be a non-linear flow channel, such as a curved flow channel. The flow channels 213 are generally distributed in parallel or at a certain angle. The diameters of the cross sections of the flow channels 213 are equal, and variable diameters may also be used. Since the flow channels 213 are independent of each other, that is, each flow channel 213 is a closed flow channel, each flow channel 213 may be pre-filled with a heat exchange medium, or each flow channel 213 may be circulated with a heat exchange medium. The heat exchange medium in each flow channel 213 may be the same or different, and the amount of heat exchange medium introduced into each flow channel 213 may also be the same or different, so as to achieve targeted heat exchange and cooling for the different heat generation of each area of ​​the battery cell 10, thereby improving the temperature balancing efficiency and temperature balancing effect.

[0061] It should be noted that the size and arrangement of the flow channel 213 can be set according to actual needs as long as the heat exchange function is met, and this document does not limit this.

[0062] In this embodiment, the temperature plate 21 includes a first heat exchange area 211 and a second heat exchange area 212. The first heat exchange area 211 may be an area opposite to the first area of ​​the battery cell 10, and the first area is an area including electrode columns, so as to achieve heat exchange between the first heat exchange area 211 and the electrode area and the area other than the electrode of the battery cell 10. The second heat exchange area 212 is an area opposite to the second area of ​​the battery cell 10, and the second area may be other areas (i.e., non-electrode areas) of the battery cell 10 excluding the first area, so as to achieve heat exchange between the second heat exchange area 212 and the non-electrode area of ​​the battery cell 10.

[0063] It is understandable that due to the different heat generation of the electrode area and the non-electrode area, it is necessary to perform heat exchange on different heating areas of the battery cell 10. Generally speaking, the heat generation of the battery cell 10 is high in the electrode area of ​​the battery cell 10 and low in the non-electrode area of ​​the battery cell 10. Specifically, the heat generation of the first area including the electrode on the battery cell 10 is greater than the heat generation of the second area. Correspondingly, the heat exchange capacity of the flow channel 213 arranged in the first heat exchange area 211 is higher than the heat exchange capacity of the flow channel 213 arranged in the second heat exchange area 212. Therefore, the first heat exchange area 211 and the second heat exchange area 212 are required to have different heat exchange capacities to perform targeted heat exchange on each heating area.

[0064] In the present application, the temperature averaging plate 21 can be set at any position where heat exchange is required, such as the top, bottom, side, etc. of the battery cell 10, according to the actual heat exchange requirements. In order to improve the installation strength of the temperature averaging plate 21, the temperature averaging plate 21 can be fixedly installed with the battery cell 10, for example, the temperature averaging plate 21 can be fixed to the battery cell 10 using thermal conductive glue.

[0065] It should be noted that the "top surface of the battery cell" and "bottom surface of the battery cell" in this article refer to Figure 1 The orientation of the battery cell 10 shown in Figure 1The upper and lower surfaces of the battery cell 10 shown in FIG. 1 are shown in FIG. 10 . In this article, “along the arrangement direction of the battery cell” refers to Figure 1 and Figure 3 The horizontal direction shown in the figure. The "first heating zone" and "second heating zone" in this article refer to the ranges set according to the length of the battery cell 10, the heat exchange performance, etc. The "first heat exchange zone" and "second heat exchange zone" in this article are the areas corresponding to the "first heating zone" and "second heating zone" respectively. The heat exchange zone can cover part or all of the corresponding heating area. In addition, the "center" in this article specifically refers to Figure 1 The area near the central longitudinal section of the battery cell 10. The "width" hereinafter refers to the area along the longitudinal section of the battery cell 10. Figure 1 In the short side direction of the battery cell 10, the “height” refers to the Figure 1 The vertical direction in .

[0066] In this embodiment, based on the fact that the battery cell 10 has at least two first heating zones and second heating zones with different heating values, the temperature homogenizing plate 21 is divided into at least two independent first heat exchange zones 211 and second heat exchange zones 212. The first heat exchange zone 211 exchanges heat with the electrodes of the battery cell 10, and the second heat exchange zone 212 exchanges heat with other areas of the battery cell 10 except the electrodes. In addition, by adjusting the heat exchange amount of the heat exchange medium in the flow channel 213 arranged in the first heat exchange zone 211 and the second heat exchange zone 212, the heat exchange performance of the first heat exchange zone 211 and the second heat exchange zone 212 can be precisely controlled. A cooling scheme with different heat exchange degrees is formed for the electrode zone and the non-electrode zone of the battery cell 10, which matches the heat exchange requirements of the first heating zone and the second heating zone of the battery cell 10, thereby ensuring the temperature balance of the first heating zone and the second heating zone of the battery cell 10, thereby effectively improving the heat exchange efficiency and the heat exchange effect.

[0067] In addition, this solution adopts a closed and mutually independent distribution structure of flow channels 213, which can be used to independently cool each part of the battery cell 10 according to the different heat exchange requirements of each part, which helps to improve the heat exchange effect. Since the flow channels 213 are independently arranged, compared with the interconnected flow channel structure on the market, the overall content of the flow channel 213 is small, and the amount of refrigerant is small, which can avoid problems such as oil channel blockage and difficulty in reflux, and the heat exchange efficiency and heat exchange effect are significantly improved. In addition, the heat exchange medium contained in the flow channel 213 in the present application is a phase change medium, and the flow channel 213 achieves uniform temperature through the phase change of the internal phase change medium to ensure the uniform temperature efficiency and uniform temperature effect.

[0068] The temperature equalizing plate provided in the present application can adjust the heat exchange amount of the first heat exchange zone 211 and the second heat exchange zone 212 according to the heat exchange requirements of each heat exchange zone of the battery cell 10, so as to accurately match the heat exchange requirements of each heat exchange zone, thereby achieving precise control of the heat exchange performance of the first heat exchange zone 211 and the second heat exchange zone 212, forming cooling schemes with different degrees of heat exchange for the electrode area and non-electrode area of ​​the battery cell, thereby improving the heat exchange efficiency.

[0069] In view of the fact that the electrode area of ​​the battery cell 10 generates high heat and the non-electrode area generates low heat, and the heat gradually decreases from the electrode area to the non-electrode area, the present application can specifically adjust the heat exchange amount of the heat exchange medium inside the flow channel 213 in an embodiment, and 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 utilize the heat exchange amount to match the heat exchange requirements of different heating areas and achieve uniform temperature of the battery cell 10.

[0070] It should be noted that the heat exchange rate in the present application may gradually decrease in a linear manner, and may be gradually decreased as a whole, but the heat exchange rates of some adjacent flow channels may be equal.

[0071] The heat exchange amount in this application can be characterized by the flow rate, flow velocity, 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 temperature equalizing plate can be changed by adjusting the flow velocity of the heat exchange medium, thereby changing the heat transfer coefficient of the flow channel. 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 characterized by the structural parameters of the temperature equalizing plate, such as the arrangement density of the flow channel 213, the spacing between the flow channels 213, and the shape and size of the flow channels 213. In addition, the heat exchange performance of the temperature equalizing plate can be changed by adding a heat exchange structure outside or inside the flow channel 213, such as adding a heat dissipation structure such as a heat dissipation fin.

[0072] The above heat exchange amount can be characterized by the parameter of arrangement density. For example, according to the different heat exchange requirements of various parts of the battery cell 10, the flow channels 213 are arranged in the temperature plate 21 in a targeted manner, and the arrangement density of the flow channels 213 in the high heat generation area is large, and the arrangement density of the flow channels 213 in the low heat generation area is small, so as to realize the zoned cooling of the battery cell 10.

[0073] In view of the fact that the heat generated at the electrode end of the battery cell 10 is higher than the heat generated in the middle of the battery cell 10, the present solution can adjust the arrangement density of the flow channels 213 in the first heat exchange zone 211 and the second heat exchange zone 212 so that 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 in the second heat exchange zone 212, thereby independently cooling each heat generating zone of the battery cell 10.

[0074] In other words, the flow channels 213 are arranged to be dense in the first heat exchange zone and sparse in the second heat exchange zone, and the arrangement density of the flow channels 213 arranged in the first heat exchange zone 211 corresponding to the electrode end is greater than the arrangement density of the flow channels 213 in the second heat exchange zone 212. In this embodiment, the flow channels 213 may be arranged in the second heat exchange zone 212, or may not be arranged.

[0075] In view of the fact that the heat generated by the battery cell 10 gradually decreases from the electrode end to the non-electrode end in the middle, the solution can adjust the arrangement density of the flow channels 213 in the first heat exchange area 211 and the second heat exchange area 212 so that the arrangement density gradually decreases from the first heat exchange area 211 to the second heat exchange area 212, so as to achieve the heat exchange requirements accordingly.

[0076] Furthermore, the calorific value of the electrode end corresponding to the first heat exchange zone 211 is greater than the calorific value of the non-electrode end corresponding to the second heat exchange zone 212, so the number of flow channels 213 corresponding to the first heat exchange zone 211 is greater than the number of flow channels 213 corresponding to the second heat exchange zone 212. The number of flow channels 213 corresponding to the first end of the battery cell 10 may be equal to or different from the number corresponding to the negative end. The cross-sectional area of ​​the flow channel in the first heat exchange zone 211 is set to be greater than the cross-sectional area of ​​the flow channel in the second heat exchange zone 212. It can be that the cross-sectional area of ​​the flow channel 213 gradually decreases along the direction from the first heat exchange zone 211 to the second heat exchange zone 212. This flow channel 213 structure, on the basis of the above-mentioned flow channel 213 gradually sparse from both ends to the center, further forms an arrangement structure in which the cross-sectional area of ​​the flow channel 213 in the first heat exchange zone 211 is large and the cross-sectional area gradually decreases along the direction of the second heat exchange zone 212, thereby further improving the heat exchange efficiency and the heat exchange effect.

[0077] Furthermore, the ideal heat exchange effect can be obtained by controlling the flow rate of the heat exchange medium in the flow channel 213. The flow rate of the flow channel 213 in the first heat exchange zone 211 is greater than the flow rate of the flow channel 213 in the second heat exchange zone 212, and the flow rate of the flow channel 213 in the direction from the first heat exchange zone 211 to the second heat exchange zone 212 gradually decreases, thereby balancing the heat exchange performance of each flow channel 213, helping to maintain the uniformity of the overall temperature of the battery cell 10, and improving the reliability and stability of the temperature plate 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, which makes it difficult for the heat exchange medium to complete a sufficient phase change process, which will also affect 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 can not only ensure that there is enough heat exchange medium to complete the phase change heat exchange, but also ensure 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 adjusted arbitrarily according to the actual heat exchange area or heat exchange temperature.

[0081] In the above embodiment of the present application, corresponding to the positive pole and the negative pole of the battery cell 10, the above 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 the first end of the battery cell 10 and exchanges heat with it, and the second sub-heat exchange zone 2112 corresponds to the second end of the battery cell 10 and exchanges heat with it, wherein the first end can be the positive pole region of the battery cell 10, and the second end can be the negative pole region of the battery cell 10. It should be noted that the middle can be understood as the middle area between the first sub-heat exchange zone 2111 and the second sub-heat exchange zone 2112.

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

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

[0084] The gap d of the first heat exchange channel 213 corresponding to the second end of the battery cell 10 is 5mm to 10mm. The gap d of the channel 213 corresponding to the middle heat exchange area of ​​the battery cell 10 is 5mm to 20mm. When the gap between adjacent channels 213 is less than 5mm, the gap is too small, and the heat exchange performance of the channel is greater than the heat exchange demand of the middle area, causing the temperature of this area to drop rapidly, even lower than the temperature of the positive and negative areas of the battery cell 10, resulting in overcooling, which is not conducive to temperature uniformity.

[0085] Taking a rectangular cross section as an example, the width of the flow channel 213 is 10mm to 50mm, and the height of the flow channel 213 is 1.5mm to 3.5mm, for example, the height can be 2mm, 2.8mm, or 3mm. When the width is less than 10mm and / or the height is less than 1.5mm, the cross-sectional area of ​​the flow channel will be too small, the amount of heat exchange medium filled in 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 is greater than 50mm and / or the height is greater than 3.5mm, the flow channel size is too large, resulting in material waste and an increase in the cost of the temperature equalizer 21. Therefore, the heat exchange performance of the temperature equalizer 21 is better within the above-mentioned interval value range.

[0086] like Figure 3 As shown, regarding the specific structure of the thermostat 21, in a specific embodiment, the thermostat 21 includes a top plate 214 and a bottom plate 215, wherein a plurality of flow grooves 2141 are arranged inside the top plate 214, and the bottom plate 215 is a plate-shaped structure, and the top surfaces of the top plate 214 and the bottom plate 215 are fixedly connected, so that each flow groove 2141 cooperates with the top surface of the bottom plate 215 to form independently distributed flow channels 213, and each flow channel 213 does not flow between each other. The thermostat 21 has a simple structure, is easy to process, and has a low cost.

[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 equal to the number of flow slots 2141, and each injection hole 217 is connected to its corresponding flow slot 2141. Figure 4 A separate injection hole 217 is provided on the top plate 214 corresponding to each flow channel 213, and the injection hole 217 is located on the surface of the flow channel 213, close to 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 by 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 use a harmonica cooling tube. The harmonica cooling tube includes a harmonica tube and two end covers. The two ends of the harmonica tube are non-closed tube structures with independent flow channels 213 inside. The end cover 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 cover is used to seal and fix with the port, thereby forming a closed flow channel 213. This structure does not need to set up a separate liquid injection structure, which can save costs, and by selecting a high heat exchange material to make the harmonica cooling tube, a better heat exchange effect can be obtained.

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

[0091] In other words, the cold plate 22 and the temperature plate 21 are respectively arranged on two opposite surfaces of the battery cell. For example, the cold plate 22 can be arranged on the top or bottom surface of the battery cell 10, and the temperature plate 21 is installed on the bottom or top surface of the battery cell 10 opposite to the cold plate installation surface. The cold plate 22 has two cooling channels, wherein the electrode cooling channel 221 is distributed in the positive electrode area and the negative electrode area of ​​the battery cell 10, and includes a plurality of parallel tubes and connecting tubes connecting the two ends of each parallel tube, and the other end of the connecting tube is connected to the joint, and the external heat exchange medium is circulated to the connecting tube through the joint, and the heat exchange medium flows through the positive and negative ends and flows back from another joint to achieve heat exchange of the positive and negative electrode areas. The middle cooling channel 222 covers other areas of the battery cell 10 except the positive and negative electrodes, and includes a plurality of parallel tubes and connecting tubes at both ends, and the heat exchange medium is circulated from the joint to the connecting tube at one place, and the heat exchange medium flows through each tube body and flows back from another joint to form heat exchange of the preset area in the middle of the battery cell 10.

[0092] In this solution, a valve is provided on the connecting pipe, and the valve can be a manual valve or a solenoid valve. When a manual valve is used, the valve opening can be manually adjusted to adjust the flow rate. When a solenoid 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 rate through an external control system, thereby achieving automatic adjustment of the flow rate, which is more accurate and efficient. Since the electrode cooling channel 221 cools the high heat generation position of the positive and negative electrodes of the battery cell 10, and the middle cooling channel 222 is used to cool the low heat generation position in the middle of the battery cell 10, the temperature difference in the same plane of the battery cell 10 can be controlled by controlling the flow rate inside the two cooling channels.

[0093] In the present application, the cold plate 22 can be arranged on the top or bottom surface of the battery cell 10 , and the temperature equalizer 21 can be arranged on the other surface, thereby reducing the temperature difference in the height direction of the battery cell 10 , thereby meeting the overall heat exchange requirements of the battery cell 10 .

[0094] For example, under normal circumstances, the liquid material of the thermostat 21 will 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, cold energy can be provided to the electrode cooling channel 221, and no or a small amount of cold energy can be provided to the middle 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 middle 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 starts to work, and the liquid material begins to evaporate and absorb heat, taking away the heat from the surface of the battery cell 10, thereby reducing the temperature of the battery cell 10. When the battery cell 10 gradually stops generating heat, at this time, the temperature of the battery cell 10 begins to drop, and the gaseous material in the flow channel 213 begins to condense into liquid material after contacting the channel wall, and the thermostat 21 starts a new cooling cycle. In this way, the heat exchange cooling effect of the battery cell 10 can be increased.

[0095] In addition, the present application can also arrange the temperature averaging plate 21 on the two opposite surfaces of the battery core or arrange the cold plate 22 on both sides. The cold plate 22 in the present application can adopt the dual-control cold plate 22 on the market, which is easy to obtain, has stable and reliable heat exchange performance, and is 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, and a plurality of independently distributed flow channels 213 are arranged in the temperature equalizing plate 21, and a phase change medium is passed through the flow channels 213. In addition, the heat exchange capacity of the gaps 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 zones of the battery cell 10 and achieving targeted cooling.

[0097] An embodiment of the present application provides a battery cell temperature equalizing device, including 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] In view of the fact that in this embodiment, the battery cell temperature equalizing device 20 includes the above-mentioned temperature equalizing plate 21 and thus has the structure and beneficial effects of the temperature equalizing plate 21 , this embodiment will not be described in detail herein.

[0099] The battery cell temperature equalization device in the present application can achieve heat exchange and temperature equalization of heat-generating 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 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] An embodiment of the present application further provides an electrical device, comprising the battery pack 1 described in any of the above embodiments, wherein the battery pack 1 is used to provide electrical energy to the electrical device.

[0103] The electrical equipment in the embodiments of the present application may be a vehicle, for example, the vehicle may be a fuel vehicle, a gas vehicle or an electric vehicle, and the electric vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Accordingly, the electrical device may be a driving mechanism of the vehicle or a control system of the vehicle.

[0104] In addition, the electrical equipment may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., among which the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0105] In view of the fact that the electric device in this embodiment includes the battery pack described in any of the above embodiments, the electric device includes the battery pack structure and beneficial effects, and this embodiment will not be further described here.

[0106] Furthermore, in order to effectively reduce the overall size of the battery pack, an integrated structure can be used to install the battery cell temperature equalizing device 20. Specifically, the battery cell temperature equalizing device 20 can be integrated in the housing and / or in the sealing cover to form an integrated installation structure. When the housing or the sealing cover is produced and processed, the battery cell temperature equalizing device 20 is arranged inside it. Therefore, there is no need to assemble the battery cell temperature equalizing device 20 separately, which can improve processing efficiency, save installation space, and reduce the overall size of the battery pack.

[0107] In combination with the above-mentioned embodiments, the above-mentioned thermostat 21 and cold plate 22 can be integrated into the corresponding sealing cover or shell, or the flow channel 213 structure in the thermostat 21 and cold plate 22 can be set in the sealing cover or shell, and assembled with the battery cell 10 to form a battery pack 1 with a built-in cooling structure.

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

[0109] In addition, the electrical equipment provided in the present application, because it has the above-mentioned battery pack, can ensure that the electrical equipment can always maintain high-performance operation, thereby extending the life of the electrical equipment and reducing user usage costs.

[0110] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A temperature equalizing plate, characterized in that: Used for heat exchange and temperature equalization of the battery core (10), the temperature equalization plate (21) is formed with a plurality of mutually unconnected flow channels (213), and the flow channels (213) are filled with heat exchange medium; 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).

2. The temperature equalizing plate according to claim 1, characterized in that: Along the direction from the first heat exchange area (211) to the second heat exchange area (212), the heat exchange amount of the flow channel (213) gradually decreases.

3. The temperature equalizing plate according to claim 2, characterized in that: The arrangement density of the flow channels (213) of the first heat exchange zone (211) is greater than the arrangement density of the flow channels (213) of the second heat exchange zone (212).

4. The temperature equalizing plate according to claim 2, characterized in that: Along the direction from the first heat exchange area (211) to the second heat exchange area (212), the arrangement density of the flow channels (213) gradually decreases.

5. The temperature homogenizing plate according to claim 2, characterized in that: 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).

6. The temperature homogenizing plate according to claim 5, characterized in that: 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.

7. The temperature equalizing plate according to claim 2, characterized in that: 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).

8. The temperature equalizing plate according to claim 7, characterized in that: Along the direction from the first heat exchange area (211) to the second heat exchange area (212), the flow rate of the flow channel (213) gradually decreases.

9. The temperature homogenizing plate according to claim 1, characterized in that: The first heat exchange zone (211) comprises a first sub-heat exchange zone (2111) and a second sub-heat exchange zone (2112); the first sub-heat exchange zone (2111) corresponds to and exchanges heat with a first end of the battery cell (10); and the second sub-heat exchange zone (2112) corresponds to and exchanges heat with a second end of the battery cell (10).

10. The temperature homogenizing plate according to claim 9, characterized in that: 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).

11. The temperature homogenizing plate according to claim 9, characterized in that: 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 averaging plate (21), and the second heat exchange zone (212) is located in the middle of the extension direction of the temperature averaging plate (21).

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

13. The temperature homogenizing plate according to claim 12, characterized in that: The flow channel (213) is a closed flow channel, and a plurality of the flow channels (213) are independently arranged.

14. The temperature homogenizing plate according to claim 13, characterized in that: 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.

15. The temperature homogenizing plate according to any one of claims 1 to 11, 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.

16. The temperature homogenizing plate according to any one of claims 1 to 11, 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.

17. The temperature homogenizing plate according to any one of claims 1 to 11, characterized in that: The temperature-averaging plate (21) comprises 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).

18. The temperature homogenizing plate according to claim 17, characterized in that: 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 connected with each of the flow grooves (2141) in a one-to-one correspondence.

19. The temperature homogenizing plate according to any one of claims 1 to 11, 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).

20. The temperature homogenizing plate according to claim 19, characterized in that: 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).

21. The temperature homogenizing plate according to any one of claims 1 to 11, characterized in that: The heat exchange medium is a phase change medium.

22. A battery cell temperature equalization device, characterized in that: It comprises the temperature equalizing plate (21) as described in any one of claims 1 to 21.

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

24. The battery cell temperature equalizing device according to claim 22, characterized in that: The battery cell temperature equalization device also includes a cold plate (22), wherein an electrode cooling channel (221) and a middle cooling channel (222) are arranged 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).

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

26. The battery pack according to claim 25, characterized in that: It comprises a sealing cover and a shell, the battery core is installed on 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.

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

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