Cold plate assembly and battery

Abstract

The application provides a cold plate assembly and a battery, and relates to the technical field of batteries. The cold plate assembly comprises a heat-conducting piece and a cooling plate; the heat-conducting piece is configured to conduct heat into the cooling plate; the heat-conducting piece and the cooling plate are configured to be in contact with different regions of an outer surface of an electric core, wherein the cooling plate is configured to be in contact with a first region of the electric core, and the heat-conducting piece is configured to be in contact with a second region of the electric core; the heat generation of the first region is greater than that of the second region. The application is targeted at the characteristics that different positions of the battery generate different heat, and the cold plate assembly is designed in structure, so as to be beneficial to reducing the temperature difference of different regions of the battery, reducing the temperature difference of the whole battery to the maximum extent, improving the service life and performance of the battery, and helping to reduce the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and in particular to a cold plate assembly and a battery. BACKGROUND

[0002] During the charging and discharging process of a power battery, heat is generated to increase the temperature inside the battery. Excessive temperature can accelerate the capacity decay of the battery, reduce the cycle life of the battery, and thus affect the cruising range, and even cause safety risks such as thermal runaway.

[0003] Therefore, it is necessary to dissipate heat from the battery. In the related art, heat is directly dissipated by a cold plate. Specifically, the cold plate is laid above or below the battery. However, the heat dissipation effect of the above-mentioned manner is poor, and the temperature difference of the battery is large, which reduces the service life of the battery. SUMMARY

[0004] In view of the above problems, the embodiments of the present application provide a cold plate assembly and a battery. In view of the different heat generation characteristics of different positions of the battery, the cold plate assembly is designed in a targeted manner, thereby beneficially reducing the temperature difference of different regions of the battery, maximizing the temperature difference of the entire battery, improving the service life and performance of the battery, and helping to reduce costs.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The first aspect of the embodiments of the present application provides a cold plate assembly for cooling an electrode group of a battery, the cold plate assembly comprising a heat-conducting member and a cooling plate; the heat-conducting member is configured to conduct heat into the cooling plate; the heat-conducting member and the cooling plate are configured to contact different regions of an outer surface of the electrode group, wherein the cooling plate is configured to contact a first region of the electrode group, and the heat-conducting member is configured to contact a second region of the electrode group; the heat generation of the first region is greater than that of the second region.

[0007] In an implementable embodiment, at least part of the heat-conducting member covers an outer surface of the cooling plate.

[0008] In an implementable embodiment, the heat-conducting member comprises a heat-conducting body, a first covering portion, and a second covering portion; the heat-conducting body is configured to be attached to an outer surface of the electrode group; the first covering portion is connected to the heat-conducting body and the second covering portion, respectively; and at least part of the second covering portion covers an outer surface of the cooling plate.

[0009] In an implementable embodiment, at least part of the second covering portion covers an outer surface of the cooling plate opposite to the electrode group.

[0010] In an implementable embodiment, the cooling plate has a cooling flow channel; at least part of the heat-conducting member is in contact with the outer surface of the cooling flow channel.

[0011] In an implementable embodiment, the cooling flow channel comprises a plurality of arc-shaped segments; the plurality of arc-shaped segments are sequentially arranged along the length direction of the cooling plate, and are connected at the head and tail.

[0012] In an implementable embodiment, each cooling plate is provided with at least two cooling flow channels, and the at least two cooling flow channels are sequentially connected; one of the at least two cooling flow channels is provided with a cooling medium inlet, and the other of the at least two cooling flow channels is provided with a cooling medium outlet; the cooling medium inlet and the cooling medium outlet are located at the same end of the cooling plate.

[0013] In an implementable embodiment, the cooling plate comprises a uniform temperature plate and a flow channel plate; the flow channel plate is connected with the uniform temperature plate; the flow channel plate has a protruding part protruding away from the uniform temperature plate; the cooling flow channel is formed between the protruding part and the uniform temperature plate; the heat-conducting member is in contact with the side of the flow channel plate away from the uniform temperature plate.

[0014] In an implementable embodiment, at least part of the heat-conducting member is directly connected with the outer surface of the cooling plate; or, a heat-conducting adhesive is arranged between the heat-conducting member and the outer surface of the cooling plate; the heat-conducting member conducts heat into the cooling plate through the heat-conducting adhesive.

[0015] In an implementable embodiment, the heat-conducting member covers the area width L of the cooling plate, wherein L≥20mm; and / or, the width of the cooling plate is H, wherein 100mm≤H≤300mm.

[0016] In an implementable embodiment, the heat-conducting member comprises a heat-conducting layer, an adhesive layer and an insulating layer; the heat-conducting layer is located between the adhesive layer and the insulating layer; the adhesive layer is configured to be bonded with the outer surface of the battery cell and the surface of the cooling plate.

[0017] In an implementable embodiment, the thickness of the insulating layer is greater than or equal to 7μm and less than or equal to 15μm; and / or, the thickness of the heat-conducting layer is greater than or equal to 7μm and less than or equal to 20μm; and / or, the thickness of the adhesive layer is greater than or equal to 12μm and less than or equal to 25μm.

[0018] In an implementable embodiment, the number of the cooling plates comprises at least two; the heat-conducting member is located between the at least two cooling plates; the heat-conducting member is configured to conduct heat into the at least two cooling plates, respectively.

[0019] The second aspect of the embodiments of the present application provides a battery, which comprises a battery cell and a cold plate assembly, the battery cell comprises a first region and a second region, an outgoing terminal is arranged on the first region, and the cooling plate of the cold plate assembly is in contact with the first region of the battery cell, and the heat conduction member of the cold plate assembly is in contact with the second region of the battery cell.

[0020] In an implementable embodiment, the battery comprises a shell, and the battery cell is arranged in the shell; the outgoing terminal comprises a positive terminal and a negative terminal, the first region comprises a first sub-region and a second sub-region, and the second region is located between the first sub-region and the second sub-region; the positive terminal is arranged in the first sub-region, and the negative terminal is arranged in the second sub-region; one of the at least two cooling plates is in contact with the first sub-region where the positive terminal is located, and the other cooling plate is in contact with the second sub-region where the negative terminal is located.

[0021] The embodiments of the present application provide a cold plate assembly and a battery, the cold plate assembly comprises a heat conduction member and a cooling plate, and the heat conduction member and the cooling plate are configured to be in contact with different regions of the outer surface of the battery cell. In this way, for the region with low heat generation, the heat conduction member is used for heat conduction, which helps to improve the heat conduction effect, and the heat dissipation amount of the heat conduction member is smaller than the cooling amount of the cooling plate, and then the use of the heat conduction member for the region with low heat generation also helps to reduce the temperature difference of the battery cell, which can well ensure that the temperature of the battery cell is more uniform. Therefore, the present application is targeted at the characteristics that different positions of the battery generate different heat, and the structure of the cold plate assembly is designed, thereby being beneficial to reducing the temperature difference of different regions of the battery, reducing the temperature difference of the whole battery to the greatest extent, improving the service life and performance of the battery. In addition, the present application helps to reduce the area of the cooling plate, thereby reducing the material cost, manufacturing cost and usage amount of the heat conduction structure adhesive of the cooling plate, greatly reducing the cost of the stamping die, and greatly reducing the cooling cost to the greatest extent. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure schematic diagram of the battery provided by the embodiments of the present application is shown;

[0023] Figure 2 The exploded schematic diagram of the battery provided by the embodiments of the present application is shown;

[0024] Figure 3 The structure schematic diagram of the cold plate assembly of the battery provided by the embodiments of the present application is shown;

[0025] Figure 4 The exploded schematic diagram of the cold plate assembly of the battery provided by the embodiments of the present application is shown;

[0026] Figure 5 The cross-sectional view of the cold plate assembly of the battery provided by the embodiments of the present application is shown.

[0027] Figure 6 For Figure 5 Partial enlarged structural schematic view of the I part in the middle;

[0028] Figure 7 Structural schematic view of the heat conduction member provided by the embodiment of the present application;

[0029] Figure 8 Top view of the cold plate assembly provided by the embodiment of the present application;

[0030] Figure 9 Structural schematic view of the three-layer structure of the heat conduction member provided by the embodiment of the present application.

[0031] Explanation of reference signs:

[0032] 100 - cold plate assembly;

[0033] 110 - heat conduction member; 111 - heat conduction body; 112 - first covering part;

[0034] 113 - second covering part; 114 - heat conduction layer; 115 - adhesive layer;

[0035] 116 - insulation layer; 120 - cooling plate; 121 - cooling flow channel;

[0036] 122 - uniform temperature plate; 123 - flow channel plate; 124 - protruding part;

[0037] 125 - cooling medium inlet; 126 - cooling medium outlet; 130 - heat conduction structure adhesive;

[0038] 200 - battery;

[0039] 210 - shell; 220 - battery cell; 230 - lead-out terminal. DETAILED DESCRIPTION

[0040] Power batteries have the advantages of large energy density, high capacity, small volume, environmental protection, etc., and are currently widely used in the field of new energy vehicles. In order to ensure the endurance mileage of the power battery, the power battery needs to ensure a certain cycle life. During the charging and discharging process of the battery, heat will be generated to increase the internal temperature of the battery. Excessive temperature will accelerate the capacity decay of the battery, reduce the cycle life of the battery, and thus affect the endurance mileage, and even have safety risks such as thermal runaway.

[0041] In the related art, heat is generally dissipated directly by a cold plate. Specifically, the cold plate is laid above or below the battery. However, the current cold plate is a whole brazing plate, so that the cooling performance of the cold plate on each region of the battery is almost uniform during the cooling process. According to the whole pack simulation and test results, the temperature of the positive and negative lug regions of the battery is the highest during the fast charging and discharging process, which is obviously higher than the temperature of the middle region of the battery cell. Therefore, in the related art, if the whole battery cell is cooled by the cold plate, the cooling capacity of the cold plate is relatively large, which leads to the fact that the cooling performance of the middle position of the battery cell is excessive, and the temperature of the low-temperature region in the middle may become lower after being cooled by the cold plate, which leads to the fact that the temperature difference of the whole pack is increased, and the service life of the battery is reduced. In addition, the current cold plate and the battery cell are fixed and heat-conducted by a whole surface of a heat-conducting structure, and it is found in the production process that the thickness of the glue of the heat-conducting structure at the middle position of the battery cell is far more than the designed value after the glue is pressed. The excessive thickness of the glue will affect the overall heat dissipation efficiency, and the above problems need to be solved by continuously increasing the pressing force, which may cause damage to other structures of the pack.

[0042] To solve the above technical problems, the embodiments of the present application provide a cold plate assembly and a battery. The cold plate assembly is designed in view of the different heating characteristics of different positions of the battery, so as to reduce the temperature difference of different regions of the battery, maximize the temperature difference of the whole battery pack, and improve the service life and performance of the battery. In addition, the present application helps to reduce the area of the cooling plate, thereby reducing the material cost, manufacturing cost and the use amount of the heat-conducting structure glue of the cooling plate, greatly reducing the cost of the stamping die, and maximizing the cooling cost.

[0043] To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference signs represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] Referring to FIGS. 1 to 4, Figure 1 and Figure 2 The embodiments of the present application provide a battery 200, which can include a shell 210, a battery cell 220 and a cold plate assembly 100. The battery cell 220 and the cold plate assembly 100 are arranged in the shell 210. The cold plate assembly 100 is used to dissipate heat from the battery cell 220 to ensure the normal operation of the battery 200 and prolong the service life and performance of the battery 200.

[0045] In this embodiment, the housing 210 can be an aluminum housing or a steel housing; this embodiment does not limit the specific type of housing. The battery 200 can be a lithium-ion battery or a sodium-ion battery, etc.; this embodiment does not limit the specific type of battery.

[0046] In the embodiments of this application, reference is made to Figure 2 As shown, the end of the battery cell 220 has a lead-out terminal 230. The structure of the lead-out terminal 230 is not limited. For example, the lead-out terminal 230 can be a tab; or, the lead-out terminal 230 can be a post; or, the lead-out terminal 230 can be a plate. This embodiment does not limit this.

[0047] For example, in this embodiment, the lead-out terminal 230 may include a positive terminal and a negative terminal. The positions of the positive and negative terminals are not limited. For example, the positive and negative terminals may be connected to opposite ends of the battery cell 220.

[0048] In this embodiment, the connection position of the cold plate assembly 100 on the battery cell 220 is not limited. For example, the cold plate assembly 100 can be connected to the side wall of the battery cell 220. Furthermore, the connection method between the cold plate assembly 100 and the battery cell 220 is not limited. For example, the cold plate assembly 100 can be glued to the battery cell 220. This embodiment does not limit this aspect.

[0049] During the charging and discharging process of battery 200, the temperature of the area at the lead-out terminal 230 is the highest, while the temperature of the middle area of ​​cell 220 is lower. Therefore, in this embodiment, referring to... Figure 2 As shown, the cooling plate 120 of the cold plate assembly 100 can be located at one end of the side wall of the cell 220 near the lead terminal 230, and the heat-conducting element 110 of the cold plate assembly 100 can be located in the middle of the side wall of the cell 220.

[0050] In this way, the heat generated by the battery cell 220 in the heat-conducting component 110 area is relatively small, while the heat generated by the battery cell 220 in the cooling plate 120 area is relatively large. The heat generated by the battery cell 220 in the heat-conducting component 110 area can be transferred to the cooling plate 120 through the heat-conducting component 110. During the heat dissipation process of the battery cell 220, the temperature difference between different areas of the battery cell 220 can be reduced. This helps to avoid the problem that the cooling performance of the middle position of the battery cell 220 is excessive, and the temperature of the middle low-temperature area may become even lower after being cooled by the cold plate, thereby reducing the temperature difference of the whole package.

[0051] The structure of the cold plate assembly provided in the embodiments of this application will be described in detail below.

[0052] Reference Figure 3 and Figure 4As shown, the cold plate assembly 100 can include a heat conducting member 110 and a cooling plate 120; the heat conducting member 110 is configured to conduct heat into the cooling plate 120. The heat conducting member 110 and the cooling plate 120 are configured to contact different regions of the outer surface of the battery cell 220.

[0053] The battery cell 220 includes a first region and a second region, the first region is provided with the lead-out terminal 230, the cooling plate 120 of the cold plate assembly contacts the first region of the battery cell 220, and the heat conducting member 110 of the cold plate assembly contacts the second region of the battery cell 220. The heat generation of the first region is greater than that of the second region.

[0054] The heat conducting member 110 and the cooling plate 120 being configured to contact different regions of the outer surface of the battery cell 220 can mean that the heat conducting member 110 and the cooling plate 120 directly contact the outer surface of the battery cell 220 or indirectly contact the outer surface of the battery cell 220, for example, the indirect contact can mean that a heat conducting member is arranged between the heat conducting member 110 and the cooling plate 120 and the outer surface of the battery cell 220 to indirectly contact the outer surface of the battery cell 220.

[0055] In the embodiments of the present application, the number of cooling plates 120 is not limited. For example, the number of cooling plates 120 can be one, two, three or more.

[0056] For example, if the battery cell 220 is provided with the lead-out terminal 230 at only one end, the number of cooling plates 120 can include at least one, and the cooling plate 120 contacts the region where the lead-out terminal 230 is located.

[0057] For example, if the battery cell 220 is provided with the lead-out terminal 230 at different positions, for example, at both ends, for example, the positive terminal and the negative terminal, the number of cooling plates 120 can include at least two, and the heat conducting member 110 is located between the at least two cooling plates 120.

[0058] Specifically, the first region can include a first sub-region and a second sub-region, and the second region is located between the first sub-region and the second sub-region. The positive terminal can be arranged in the first sub-region, and the negative terminal can be arranged in the second sub-region. One of the cooling plates 120 contacts the first sub-region where the positive terminal is located, and the other cooling plate 120 contacts the second sub-region where the negative terminal is located.

[0059] For example, the first sub-region can be as shown in the A region of Figure 2 For example, the second sub-region can be as shown in the C region of Figure 2 For example, the second region can be as shown in the B region of Figure 2

[0060] ​In this embodiment, mainly taking two cooling plates 120 as an example for illustration. In this way, it is helpful to maximize the cooling of the high temperature area at the positive and negative terminals, thereby improving the cooling effect of the battery cell 220, prolonging the service life and performance of the battery cell 220.

[0061] In the embodiment of the present application, at least part of the heat conduction member 110 covers the outer surface of the cooling plate 120. In this way, it is helpful to increase the connection area between the heat conduction member 110 and the cooling plate 120, thereby improving the heat conduction efficiency of the heat conduction member 110 to the cooling plate 120, and improving the heat dissipation efficiency of the battery 200. For example, the edges of the heat conduction member 110 and the cooling plate 120 can be overlapped together. Wherein, the overlapping area of the heat conduction member 110 and the cooling plate 120 is not limited, and can be set according to actual needs.

[0062] In the embodiment of the present application, the material of the heat conduction member 110 is not limited. For example, the heat conduction member 110 can be a copper foil, a filter, a graphene film, etc. high thermal conductivity material. Wherein, the heat conduction principle of the heat conduction member 110 mainly depends on its special physical structure and material properties, effectively transfers heat, and is taken away by the external cooling medium, so as to ensure that the battery cell 220 works at the temperature it can withstand. The heat conduction principle of the cooling plate 120 mainly depends on the cooling medium such as cooling liquid to exchange heat to achieve heat dissipation.

[0063] In this way, compared with the integrated cold plate in the related art, the cold plate assembly 100 in the embodiment of the present application is a combined cold plate, which is designed for the different heat characteristics of different positions of the battery 200, thereby being helpful to reduce the temperature difference of different regions of the battery 200, maximize the temperature difference of the whole battery 200, and improve the service life and performance of the battery 200. In addition, the present application helps to reduce the area of the cooling plate 120, thereby reducing the material cost, manufacturing cost and usage amount of the heat conduction structure adhesive of the cooling plate 120, greatly reducing the cost of the stamping die, and maximizing the cooling cost. Moreover, the cooling amount of the heat conduction member 110 is less than that of the cooling plate 120, and the heat conduction member 110 is used in the region with low heat generation, which is helpful to reduce the temperature difference of the battery cell 220.

[0064] In an implementable embodiment, the heat-conducting member 110 is not limited in the way of conducting heat into the cooling plate 120. For example, at least part of the heat-conducting member 110 and the outer surface of the cooling plate 120 can be directly connected, so as to directly conduct heat into the cooling plate 120; for example, a heat-conducting glue can be arranged between the heat-conducting member 110 and the outer surface of the cooling plate 120, and the heat-conducting member 110 can conduct heat into the cooling plate 120 through the heat-conducting glue; or the heat-conducting member 110 can also conduct heat into the cooling plate 120 through other heat-conducting structures, such as a metal member, etc. The present embodiment is not limited in this regard.

[0065] In an implementable embodiment, referring to FIGS. 1 and 2, the cooling plate 120 can have a cooling flow channel 121; at least part of the structure of the side edge of the heat-conducting member 110 connected with the cooling plate 120 is in contact with the outer surface of the cooling flow channel 121. Figure 5 Figure 6 In an implementable embodiment, referring to FIGS. 1 and 2, the cooling plate 120 can have a cooling flow channel 121; at least part of the structure of the side edge of the heat-conducting member 110 connected with the cooling plate 120 is in contact with the outer surface of the cooling flow channel 121.

[0066] In the present embodiment, the number, shape and opening position of the cooling flow channel 121 are not limited, and can be set according to actual needs. By including the cooling flow channel 121, the cooling flow channel 121 can contain circulating cooling medium, so as to take out heat from the battery 200 through the cooling medium.

[0067] In the present embodiment, part of the structure of the heat-conducting member 110 is in contact with the outer surface of the cooling flow channel 121, so that the part of the structure of the heat-conducting member 110 covers the cooling flow channel 121, which can improve the heat conduction efficiency of the heat-conducting member 110 to the cooling plate 120.

[0068] In an implementable embodiment, referring to FIGS. 1 and 2, the heat-conducting member 110 can include a heat-conducting main body 111, a first covering part 112 and a second covering part 113; the heat-conducting main body 111 is configured to be attached to the outer surface of the battery cell 220; the first covering part 112 is connected with the heat-conducting main body 111, and the first covering part 112 is respectively connected with the heat-conducting main body 111 and the second covering part 113, and the second covering part 113 covers the outer surface of the cooling flow channel 121. Figure 7 In the present embodiment, the structure of the heat-conducting main body 111, the first covering part 112 and the second covering part 113 is not limited. For example, the first covering part 112 forms a step relative to the heat-conducting main body 111, and the second covering part 113 forms another step relative to the first covering part 112, that is, the height of the heat-conducting main body 111, the first covering part 112 and the second covering part 113 is gradually increased. The present embodiment is not limited in this regard.

[0069]

[0070] ​​Correspondingly, the height of the cooling plate 120 is also increased in turn, so that the heat conduction main body 111, the first covering part 112 and the second covering part 113 cover the outer surface of the battery cell 220, the edge of the side of the cooling plate 120 facing the heat conduction main body 111 and the outer surface of the cooling flow channel 121 in turn, so that the heat conduction member 110 can be maximally attached to the outer surface of the cooling flow channel 121, and the heat conduction efficiency of the heat conduction member 110 to the cooling plate 120 is further improved.

[0071] Exemplarily, the heat transfer direction in the embodiment can refer to the arrow direction shown in Figure 7 .

[0072] In an implementable embodiment, in order to further expand the heat dissipation area, at least part of the second covering part 113 covers the outer surface of the cooling plate 120 opposite to the battery cell 220.

[0073] Exemplarily, at least part of the second covering part 113 can cover the upper surface of the cooling plate 120 opposite to the battery cell; or at least part of the second covering part 113 covers the lower surface of the cooling plate 120 opposite to the battery cell. The embodiment is not limited in this regard. In this way, it is helpful to increase the heat exchange area and further improve the heat conduction efficiency of the heat conduction member 110 to the cooling plate 120.

[0074] In an implementable embodiment, referring to Figures 1 to 4 , the cooling flow channel 121 can include a plurality of arc-shaped segments; the plurality of arc-shaped segments are arranged in turn along the length direction of the cooling plate 120, and connected at the head and tail.

[0075] In the embodiment of the application, the number, arrangement mode and bending direction of the arc-shaped segments are not limited, and can be set according to actual needs.

[0076] In this way, through the design mode of the plurality of arc-shaped segments, the heat dissipation efficiency of the high heat generation area of the battery cell 220 can be effectively improved, and the pressure loss of the cooling medium is reduced. In addition, the flow path of the cooling medium in the cooling flow channel 121 can be increased, the heat exchange efficiency is improved, and the cooling effect is enhanced; moreover, the design makes the cooling medium form a spiral flow inside the cooling flow channel 121, increases the contact time of the cooling medium and the pipe wall, and reduces the energy consumption; in addition, it is helpful to maintain the uniformity of the temperature of the battery 200, and through the optimization of the flow channel structure, the temperature difference between the battery 200 monomers can be reduced, and the occurrence of local overheating phenomenon is avoided, thereby improving the safety and stability of the battery 200.

[0077] It should be noted that the cooling flow channel 121 can include but is not limited to an arc-shaped flow channel, and the cooling flow channel 121 can also be a straight flow channel, for example. Alternatively, the cooling flow channel 121 can be a spiral flow channel. Alternatively, the cooling flow channel 121 can be a U-shaped flow channel. Alternatively, the cooling flow channel 121 can be a circumferential flow channel. The present embodiment does not limit this.

[0078] In addition, the arrangement mode of the cooling flow channel 121 can include circular arrangement, snake-shaped arrangement, cross-shaped arrangement, etc. The present embodiment does not limit this, and can be set as required.

[0079] In an implementable embodiment, referring to Figures 1 to 4 each cooling plate 120 can be provided with at least two cooling flow channels 121, and the at least two cooling flow channels 121 are sequentially communicated. One of the at least two cooling flow channels 121 is provided with a cooling medium inlet 125, and the other of the at least two cooling flow channels 121 is provided with a cooling medium outlet 126. The cooling medium inlet 125 and the cooling medium outlet 126 are located at the same end of the cooling plate 120.

[0080] In the present embodiment, the number of cooling flow channels 121 is not limited. In the present embodiment, two cooling flow channels 121 are provided for each cooling plate 120. One of the cooling flow channels 121 is provided with a cooling medium inlet 125, and the other of the cooling flow channels 121 is provided with a cooling medium outlet 126. The cooling medium can be a cooling liquid, for example. The present embodiment does not limit this.

[0081] In the present embodiment, the cooling medium inlet 125 and the cooling medium outlet 126 are located at the same end of the cooling plate 120. This design can simplify the structure of the cooling plate 120, so that the cooling medium can enter or flow out through the same end, reducing the complexity of pipe connection and turning. In addition, this design also helps to reduce pressure loss, reduce unnecessary pipe bending and connection, thereby reducing the overall operating cost and maintenance demand of the system.

[0082] In an implementable embodiment, referring to Figure 6 the cooling plate 120 can include a uniform temperature plate 122 and a flow channel plate 123. The flow channel plate 123 is connected with the uniform temperature plate 122, and the heat conduction member 110 is in contact with the side of the flow channel plate 123 away from the uniform temperature plate 122.

[0083] In the present embodiment, the uniform temperature plate 122 is a kind of high-efficiency heat conduction device, whose main principle is based on the phase change heat transfer mechanism. Through the evaporation and condensation process of the working liquid, efficient heat transfer is realized. The uniform temperature plate 122 of the present embodiment can be a flat plate structure, for example.

[0084] In this embodiment, the connection method between the heat spreader 122 and the battery cell 220 is not limited. For example, the heat spreader 122 and the battery cell 220 can be bonded together using thermally conductive structural adhesive 130. Furthermore, the connection method between the thermally conductive component 110 and the flow channel plate 123 is also not limited; for example, the thermally conductive component 110 and the flow channel plate 123 can be bonded together.

[0085] In the embodiments of this application, reference is made to Figures 1 to 6 As shown, the flow channel plate 123 has a protrusion 124 that protrudes away from the heat exchange plate 122, and a cooling flow channel 121 is formed between the protrusion 124 and the heat exchange plate 122. This provides sufficient space to accommodate the cooling medium. The protrusion height of the protrusion 124 is not limited.

[0086] In one feasible implementation, refer to Figure 8 As shown, the area L of the heat-conducting element 110 covering the cooling plate 120 is ≥ 20mm. For example, L can be any value of 20mm, 25mm, 30mm, or not less than 20mm. It is understood that L cannot be infinitely large and can be set according to the actual product. This improves the bonding reliability between the heating film and the cooling plate 120, and ensures a sufficiently large contact area, thereby improving the efficiency of heat transfer. Preferably, if the area L of the heat-conducting element 110 covering the cooling plate 120 is made large, the heat-conducting element 110 can completely cover the cooling plate 120, that is, the area L of the heat-conducting element 110 covering the cooling plate 120 is equal to the length of the cooling plate 120 in the direction in which the cooling plate 120 and the heat-conducting element 110 are arranged, thereby further improving the heat transfer efficiency of the heat-conducting element 110.

[0087] In this embodiment of the application, the width of the cooling plate 120 can be H, where 100mm ≤ H ≤ 300mm. For example, H can be 100mm, 150mm, 200mm, 250mm, 300mm, or any value between 100mm and 300mm.

[0088] If the width of the cooling plate 120 is less than 100mm, the contact area between the cooling plate 120 and the high-heat area of ​​the battery cell 220 is small, which cannot ensure the heat dissipation efficiency of the high-heat area of ​​the battery cell 220. If the width of the cooling plate 120 is greater than 300mm, the cooling plate 120 is large, which can easily cause the cooling plate 120 to partially cover the low-heat area, affecting the temperature balance of the battery cell 220.

[0089] Therefore, in the embodiment, 100mm≤H≤300mm is defined, which can not only ensure that the high-heat area of the battery cell 220 has high heat dissipation efficiency, but also will not cover the low-heat area, thereby being beneficial to reducing the temperature difference of different areas of the battery 200, maximizing the temperature difference of the whole battery 200, and improving the service life and performance of the battery 200.

[0090] In an implementable embodiment, referring to Figure 9 As shown in the figure, the heat conduction member 110 can include a heat conduction layer 114, an adhesive layer 115, and an insulating layer 116, the heat conduction layer 114 is located between the adhesive layer 115 and the insulating layer 116, and the adhesive layer 115 is configured to be adhered to the outer surface of the battery cell 220 and the surface of the cooling plate 120.

[0091] In the embodiment, the material of the adhesive layer 115 is not limited. For example, the adhesive layer 115 can be a high-thermal-conductivity glue layer, and the glue is directly coated on the heat conduction layer 114. The adhesive layer 115 is adhered to the surface of the cooling plate 120 and the outer surface of the battery cell 220, thereby not only playing a heat conduction role, but also playing an adhesive role, ensuring the effective adhesion of the heat conduction member 110 and preventing falling off.

[0092] In the embodiment, the material of the insulating layer 116 is not limited. For example, the high-molecular insulating layer 116 can be an insulating material such as polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and polyimide (PI). In this way, the insulating layer 116 is located at the top of the battery cell 220, which can effectively ensure the insulation effect of the battery cell 220 and prevent short circuit risk.

[0093] In the embodiment, the material of the heat conduction layer 114 is not limited. For example, the heat conduction layer 114 can be a material with high thermal conductivity such as copper foil, aluminum foil, and graphene film. It can be understood that the heat conduction layer 114 in the embodiment mainly plays a heat conduction role.

[0094] In an implementable embodiment, the thickness of the insulating layer 116 can be greater than or equal to 7μm and less than or equal to 15μm. For example, the thickness of the insulating layer 116 can be 7μm, 8μm, 9μm, 10μm, 13μm, 15μm, or any value between 7μm and 15μm.

[0095] If the thickness of the insulation layer 116 is less than 7 μm, the thickness of the insulation layer 116 is too thin, which can cause obstacles such as bubbles and cracks in the heat transfer process, and these obstacles can increase the thermal resistance and affect the heat transfer effect. If the thickness of the insulation layer 116 is greater than 15 μm, the thickness of the insulation layer 116 is too thick, which can limit the heat transfer between different components and reduce the overall performance. Therefore, in the embodiment, the thickness of the insulation layer 116 is limited to be between 7 μm and 15 μm, which helps to ensure good insulation performance and does not excessively affect the heat conduction effect.

[0096] In the embodiment, the thickness of the heat conduction layer 114 can be greater than or equal to 7 μm and less than or equal to 20 μm. For example, the thickness of the heat conduction layer 114 can be 7 μm, 8 μm, 9 μm, 10 μm, 13 μm, 15 μm, 20 μm, or any value between 7 μm and 20 μm.

[0097] If the thickness of the heat conduction layer 114 is less than 7 μm, the thickness of the heat conduction layer 114 is too thin, which can cause poor heat conduction effect and cannot effectively carry out the heat from the inside of the battery 200, resulting in an increase in the temperature inside the battery 200, which can cause safety problems such as thermal runaway. In addition, the too thin heat conduction layer 114 can not provide sufficient support and protection, and is easy to be damaged under vibration or impact, affecting the stability and durability of the battery 200. If the thickness of the heat conduction layer 114 is greater than 20 μm, the heat transfer efficiency can be too high, which can cause the temperature of the battery 200 to drop or rise too fast, which is not conducive to the stable performance of the battery 200. In addition, the too thick heat conduction layer 114 can increase the manufacturing cost, which is not conducive to cost control. Therefore, in the embodiment, the thickness of the heat conduction layer 114 is limited to be between 7 μm and 20 μm, which is conducive to improving the heat conduction effect and does not affect the performance and safety of the battery 200.

[0098] In the embodiment, the thickness of the adhesive layer 115 can be greater than or equal to 12 μm and less than or equal to 25 μm. For example, the thickness of the adhesive layer 115 can be 12 μm, 15 μm, 17 μm, 20 μm, 22 μm, 24 μm, 25 μm, or any value between 12 μm and 25 μm.

[0099] If the thickness of the adhesive layer 115 is less than 12 pm, the thickness of the adhesive layer 115 is too small, which can cause insufficient adhesion, affect the overall structural stability of the battery 200, and easily cause internal short circuit or structural damage of the battery 200 during use, thereby reducing the safety and reliability of the battery 200. If the thickness of the adhesive layer is greater than 25 pm, the thickness of the adhesive layer is too thick, which can provide stronger adhesion, but at the same time can increase the internal resistance of the battery 200, affect the service life and performance of the battery 200, and in addition, the too thick adhesive layer also occupies the space inside the battery 200, thereby reducing the energy density of the battery 200. Therefore, the embodiment limits the thickness of the adhesive layer to be between 12 pm and 25 pm, which can not only ensure good adhesion, but also will not occupy too much space inside the battery 200.

[0100] The embodiment of the present application provides a cold plate assembly and a battery. In view of the characteristics that different positions of the battery generate different heat, the cold plate assembly is designed in a targeted manner, so that the temperature difference of different regions of the battery is reduced, the temperature difference of the whole battery is reduced to the greatest extent, and the service life and performance of the battery are improved. In addition, the present application helps to reduce the area of the cooling plate, thereby reducing the material cost, manufacturing cost and use amount of the heat-conducting structural adhesive of the cooling plate, and greatly reducing the cost of the stamping die, thereby greatly reducing the cooling cost.

[0101] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0102] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0103] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0104] Furthermore, the term "comprising" and "including" and their variants are intended to cover both the case where only the listed steps or elements are present and the case where additional steps or elements are present. The term "consisting essentially of" is intended to mean that the listed steps or elements are present, but that additional steps or elements not substantially affecting the basic operation of the process, method, system, product or device can be present.

[0105] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, rather than limiting the technical solutions of the present application; although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the technical solutions recorded in the above-mentioned embodiments can still be modified, or some or all of the technical features can be replaced by equivalent replacements; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cold plate assembly, characterized by, A cooling plate assembly for cooling an electric cell of a battery, the cooling plate assembly comprising a heat conducting member (110) and a cooling plate (120); the heat conducting member (110) is configured to conduct heat into the cooling plate (120); the heat conducting member (110) and the cooling plate (120) are configured to contact different regions of an outer surface of the electric cell; wherein the cooling plate (120) is configured to contact a first region of the electric cell, and the heat conducting member (110) is configured to contact a second region of the electric cell; the first region generates more heat than the second region.

2. The cold plate assembly of claim 1, wherein, At least part of the heat conducting member (110) covers an outer surface of the cooling plate (120).

3. The cold plate assembly of claim 2, wherein, The heat conducting member (110) comprises a heat conducting body (111), a first covering portion (112) and a second covering portion (113); the heat conducting body (111) is configured to be attached to an outer surface of the electric cell; the first covering portion (112) is connected to the heat conducting body (111) and the second covering portion (113) respectively, and at least part of the second covering portion (113) covers an outer surface of the cooling plate (120).

4. The cold plate assembly of claim 3, wherein, At least part of the second covering portion (113) covers an outer surface of the cooling plate (120) opposite to the electric cell.

5. The cold plate assembly of any one of claims 1-4, wherein, The cooling plate (120) has a cooling flow channel (121); at least part of the structure of the heat conducting member (110) is in contact with an outer surface of the cooling flow channel (121).

6. The cold plate assembly of claim 5, wherein, The cooling flow channel (121) comprises a plurality of arc-shaped segments; the plurality of arc-shaped segments are sequentially arranged along a length direction of the cooling plate (120) and connected at the head and tail.

7. The cold plate assembly of claim 5, wherein, Each cooling plate (120) is provided with at least two cooling flow channels (121), and the at least two cooling flow channels (121) are sequentially connected; one of the at least two cooling flow channels (121) is provided with a cooling medium inlet (125), and the other of the at least two cooling flow channels (121) is provided with a cooling medium outlet (126); the cooling medium inlet (125) and the cooling medium outlet (126) are located at the same end of the cooling plate (120).

8. The cold plate assembly of claim 5, wherein, The cooling plate (120) comprises a uniform temperature plate (122) and a flow channel plate (123); the flow channel plate (123) is connected to the uniform temperature plate (122); the flow channel plate (123) has a protruding portion (124) protruding away from the uniform temperature plate (122); the cooling flow channel (121) is formed between the protruding portion (124) and the uniform temperature plate (122); the heat conducting member (110) is in contact with a side of the flow channel plate (123) away from the uniform temperature plate (122).

9. The cold plate assembly of any of claims 1-4, wherein, At least part of the heat conducting member (110) is directly connected to an outer surface of the cooling plate (120); or, a heat conducting adhesive is arranged between the heat conducting member (110) and the outer surface of the cooling plate (120); the heat conducting member (110) conducts heat into the cooling plate (120) through the heat conducting adhesive.

10. The cold plate assembly of any one of claims 1-4, wherein, The heat conducting member (110) covers an area of the cooling plate (120) with a width L, wherein L≥20mm; and / or, The cooling plate (120) has a width H, wherein 100mm≤H≤300mm.

11. The cold plate assembly of any of claims 1-4, wherein, The heat conduction member (110) comprises a heat conduction layer (114), an adhesive layer (115) and an insulation layer (116), the heat conduction layer (114) is located between the adhesive layer (115) and the insulation layer (116), and the adhesive layer (115) is configured to be adhered to the outer surface of the electric core and the surface of the cooling plate (120).

12. The cold plate assembly of claim 11, wherein, The thickness of the insulation layer (116) is greater than or equal to 7μm and less than or equal to 15μm; and / or, The thickness of the heat conduction layer (114) is greater than or equal to 7μm and less than or equal to 20μm; and / or, The thickness of the adhesive layer (115) is greater than or equal to 12μm and less than or equal to 25μm.

13. The cold plate assembly of any one of claims 1-4, wherein, The number of the cooling plates (120) comprises at least two, and the heat conduction member (110) is located between the at least two cooling plates (120); The heat conduction member (110) is configured to conduct heat into the at least two cooling plates (120) respectively.

14. A battery, characterized by The battery comprises an electric core and the cooling plate assembly according to any one of claims 1-13. The electric core (220) comprises a first region and a second region, the first region is provided with an outgoing terminal (230), the cooling plate (120) of the cooling plate assembly is in contact with the first region of the electric core (220), and the heat conduction member (110) of the cooling plate assembly is in contact with the second region of the electric core (220).

15. The battery of claim 14, wherein, The battery comprises a shell (210), and the electric core (220) is arranged in the shell (210); The outgoing terminal (230) comprises a positive terminal and a negative terminal, the first region comprises a first sub-region and a second sub-region, and the second region is located between the first sub-region and the second sub-region; The positive terminal is arranged in the first sub-region, and the negative terminal is arranged in the second sub-region; One of the at least two cooling plates (120) is in contact with the first sub-region where the positive terminal is located, and the other cooling plate (120) is in contact with the second sub-region where the negative terminal is located.

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