Cold plate assembly and battery

Abstract

The invention provides a cold plate assembly and a battery, and relates to the technical field of batteries. The cold plate assembly comprises a heat conduction piece and a cooling plate. The heat conduction piece is configured to conduct heat into the cooling plate; the heat conduction piece and the cooling plate are configured to be in contact with different areas of the outer surface of the battery cell, the cooling plate is used for being in contact with a first area of the battery cell, and the heat conduction piece is used for being in contact with a second area of the battery cell; a calorific value of the first region is greater than that of the second region. According to the characteristic that different positions of the battery generate different heat, the cold plate assembly is specifically subjected to structural design, so that the temperature difference of different areas of the battery is reduced, the temperature difference of the whole battery pack is reduced to the greatest extent, the service life of the battery is prolonged, the performance of the battery is improved, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cold plate assembly and a battery. Background Art

[0002] During the charging and discharging process, power batteries will generate heat, which will increase the internal temperature of the battery. Excessive temperature will accelerate the decay of battery capacity and reduce the battery's cycle life, thereby affecting the cruising range and even causing safety risks such as thermal runaway.

[0003] Therefore, it is necessary to dissipate heat from the battery. In the related art, heat is generally dissipated directly through a cold plate. Specifically, the cold plate is laid above or below the battery. However, the heat dissipation effect of the above method is poor, the temperature difference of the battery is large, and the battery life is reduced. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide a cold plate assembly and a battery. According to the characteristics of different heat generation in different positions of the battery, the structure of the cold plate assembly is designed in a targeted manner, which is beneficial to reduce the temperature difference in different areas of the battery, minimize the temperature difference of the entire battery pack, improve the battery life and performance, and help reduce costs.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a cold plate assembly for cooling a battery cell, the cold plate assembly comprising a heat conductor and a cooling plate; the heat conductor is configured to conduct heat to the cooling plate; the heat conductor and the cooling plate are configured to contact different areas of the outer surface of the battery cell, wherein the cooling plate is used to contact a first area of ​​the battery cell, and the heat conductor is used to contact a second area of ​​the battery cell; the heat generated by the first area is greater than the heat generated by the second area.

[0007] In a feasible implementation, at least a portion of the heat conducting element covers an outer surface of the cooling plate.

[0008] In a feasible embodiment, the heat conductive part includes a heat conductive body, a first covering part and a second covering part; the heat conductive body is configured to be attached to the outer surface of the battery cell; the first covering part is respectively connected to the heat conductive body and the second covering part, and at least part of the second covering part covers the outer surface of the cooling plate.

[0009] In a feasible implementation manner, at least a portion of the second covering portion covers an outer surface of the cooling plate opposite to the battery core.

[0010] In a feasible implementation, the cooling plate has a cooling channel; and at least a portion of the structure of the heat conducting element is in contact with an outer surface of the cooling channel.

[0011] In a feasible implementation, the cooling channel includes a plurality of arc segments; the plurality of arc segments are sequentially arranged along the length direction of the cooling plate and connected end to end.

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

[0013] In a feasible embodiment, the cooling plate includes a temperature balancing plate and a flow channel plate, wherein the flow channel plate is connected to the temperature balancing plate, the flow channel plate has a protrusion protruding away from the temperature balancing plate, and the cooling flow channel is formed between the protrusion and the temperature balancing plate; the heat conductor is in contact with a side of the flow channel plate away from the temperature balancing plate.

[0014] In one feasible implementation, at least a portion of the heat conductive element is directly connected to the outer surface of the cooling plate; or, a thermal conductive adhesive is provided between the heat conductive element and the outer surface of the cooling plate, and the heat conductive element conducts heat to the cooling plate through the thermal conductive adhesive.

[0015] In a feasible implementation, the heat conducting member covers a region of the cooling plate with a width L, wherein L≥20 mm; and / or the cooling plate has a width H, wherein 100 mm≤H≤300 mm.

[0016] In a feasible embodiment, the heat conducting member includes 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, and the adhesive layer is configured to bond to the outer surface of the battery core and the surface of the cooling plate.

[0017] In a feasible implementation, the thickness of the insulating layer is greater than or equal to 7 μm and less than or equal to 15 μm; and / or the thickness of the thermal conductive layer is greater than or equal to 7 μm and less than or equal to 20 μm; and / or the thickness of the adhesive layer is greater than or equal to 12 μm and less than or equal to 25 μm.

[0018] In an achievable implementation, the number of the cooling plates includes at least two, the heat conductor is located between at least two of the cooling plates; and the heat conductor is configured to conduct heat to the at least two cooling plates respectively.

[0019] A second aspect of an embodiment of the present application provides a battery, comprising a battery cell and a cold plate assembly, wherein the battery cell comprises a first region and a second region, wherein a lead terminal is provided on the first region, a cooling plate of the cold plate assembly is in contact with the first region of the battery cell, and a heat conductive member of the cold plate assembly is in contact with the second region of the battery cell.

[0020] In a feasible embodiment, the battery includes a shell, and the battery cell is arranged in the shell; the lead terminal includes a positive terminal and a negative terminal, the first region includes 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 embodiment of the present application provides a cold plate assembly and a battery, wherein the cold plate assembly includes a heat conductor and a cooling plate, wherein the heat conductor and the cooling plate are configured to contact different areas of the outer surface of the battery cell. In this way, for areas with low heat generation, using a heat conductor for heat conduction helps to improve the heat conduction effect, and the heat dissipation of the heat conductor relative to the cooling plate is less than the cooling amount of the cooling plate, and thus using a heat conductor in areas 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 specifically designs the structure of the cold plate assembly in view of the different heat generation characteristics of different positions of the battery, which is beneficial to reduce the temperature difference of different areas of the battery, minimize the temperature difference of the entire battery pack, and improve the battery life and performance; in addition, the present application helps to reduce the area of ​​the cooling plate, thereby reducing the material cost, manufacturing cost and use of the heat-conducting structural adhesive of the cooling plate, and the cost of the stamping die is also greatly reduced, minimizing the cooling cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0023] Figure 2 An exploded schematic diagram of a battery provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of a cold plate assembly of a battery provided in an embodiment of the present application;

[0025] Figure 4 An exploded schematic diagram of a cold plate assembly of a battery provided in an embodiment of the present application;

[0026] Figure 5 A cross-sectional view of a cold plate assembly of a battery provided in an embodiment of the present application;

[0027] Figure 6 for Figure 5 A schematic diagram of the partially enlarged structure of part I;

[0028] Figure 7 A schematic diagram of the structure of a heat conducting member provided in an embodiment of the present application;

[0029] Figure 8 A top view of a cold plate assembly provided in an embodiment of the present application;

[0030] Fig. 9 A schematic diagram of the three-layer structure of the heat conducting component provided in an embodiment of the present application.

[0031] Description of reference numerals:

[0032] 100-cold plate assembly;

[0033] 110-heat conducting member; 111-heat conducting body; 112-first covering portion;

[0034] 113 - second covering portion; 114 - heat conducting layer; 115 - adhesive layer;

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

[0036] 122-temperature balancing plate; 123-flow channel plate; 124-protrusion;

[0037] 125-cooling medium inlet; 126-cooling medium outlet; 130-thermal conductive structural adhesive;

[0038] 200-battery;

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

[0040] Power batteries have the advantages of high energy density, high capacity, small size, and environmental protection. They are currently widely used in the field of new energy vehicles. In order to ensure the endurance of power batteries, power batteries must ensure a certain cycle life. During the charging and discharging process, the battery will generate heat, which will increase the internal temperature of the battery. Excessive temperature will accelerate the attenuation of battery capacity and reduce the cycle life of the battery, thereby affecting the endurance and even causing safety risks such as thermal runaway.

[0041] In the related art, heat is generally dissipated directly through a cold plate. Specifically, the cold plate is laid above or below the battery. However, the current cold plate is a whole piece of brazed plate, so that during the cooling process, the cooling performance of the cold plate on each area of ​​the battery is almost the same. From the simulation and test results of the whole package, it can be seen that during the fast charging and fast discharging of the battery pack, the temperature of the positive and negative ear areas of the battery is the highest, which is significantly higher than the temperature of the middle area of ​​the battery cell. Therefore, in the related art, if the entire battery cell is cooled by a cold plate, the cooling capacity of the cold plate is relatively large, resulting in excessive cooling performance in the middle position of the battery cell, and it is possible that the temperature of the middle low temperature area becomes lower after cooling by the cold plate, resulting in an increase in the temperature difference of the whole package and a reduction in battery life. In addition, the current cold plate and the battery cell are fixed and heat-conducted by a full-surface thermal conductive structural member. During the production process, it was found that the thickness of the thermal conductive structural glue in the middle position of the battery cell after the glue was pressed was far greater than the design value. Too thick glue will affect the overall heat dissipation efficiency. The above problem needs to be solved by continuously increasing the glue pressing pressure, which will bring the risk of damage to other structures of the package.

[0042] In response to the above technical problems, the embodiments of the present application provide a cold plate assembly and a battery. According to the characteristics of different heat generation in different positions of the battery, the cold plate assembly is structurally designed in a targeted manner, which is beneficial to reducing the temperature difference in different areas of the battery, minimizing the temperature difference of the entire battery pack, and improving the battery life and performance; in addition, the present application helps to reduce the area of ​​the cooling plate, thereby reducing the material cost, manufacturing cost and usage of the thermal conductive structural adhesive of the cooling plate, and the cost of the stamping die is also greatly reduced, thereby minimizing the cooling cost.

[0043] In order 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 in conjunction with the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] Reference Figure 1 and Figure 2 As shown, the embodiment of the present application provides a battery 200, which may include a housing 210, a battery cell 220 and a cold plate assembly 100, wherein the battery cell 220 and the cold plate assembly 100 are arranged in the housing 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 extend the service life and performance of the battery 200.

[0045] In the embodiment of the present application, the housing 210 may be an aluminum housing, or the housing 210 may be a steel housing, which is not limited in the present embodiment. The battery 200 may be a lithium ion battery or a sodium ion battery, etc., which is not limited in the present embodiment.

[0046] In the present application, refer to Figure 2 As shown, the end of the battery cell 220 has a lead terminal 230. The structure of the lead terminal 230 is not limited. For example, the lead terminal 230 can be a pole ear; or, the lead terminal 230 can be a pole column; or, the lead terminal 230 can be a pole piece. 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 terminal and the negative terminal are not limited. For example, the positive terminal and the negative terminal may be connected to opposite ends of the battery cell 220.

[0048] In the embodiment of the present application, there is no limitation on the connection position of the cold plate assembly 100 on the battery cell 220. For example, the cold plate assembly 100 can be connected to the side wall of the battery cell 220. In addition, there is no limitation on the connection method between the cold plate assembly 100 and the battery cell 220. For example, the cold plate assembly 100 can be connected to the battery cell 220 by gluing. This embodiment does not limit this.

[0049] Among them, during the charging and discharging process of the battery 200, the temperature of the lead-out terminal 230 area is the highest, and the temperature of the middle area of ​​the battery cell 220 is relatively low. Figure 2 As shown, the cooling plate 120 of the cold plate assembly 100 may be located at one end of the side wall of the battery cell 220 close to the lead-out terminal 230 , and the heat conducting member 110 of the cold plate assembly 100 may be located in the middle of the side wall of the battery cell 220 .

[0050] In this way, the heat generated by the battery cells 220 in the area of ​​the heat conductor 110 is relatively small, and the heat generated by the battery cells 220 in the area of ​​the cooling plate 120 is relatively large. The heat generated by the battery cells 220 in the area of ​​the heat conductor 110 can be transferred to the cooling plate 120 through the heat conductor 110. In the process of heat dissipation of the battery cells 220, the temperature difference between different areas of the battery cells 220 can be reduced, which helps to avoid the problem of excessive cooling performance in the middle position of the battery cells 220, and it is possible that the temperature of the middle low-temperature area becomes lower after cooling by the cold plate, thereby reducing the temperature difference of the entire package.

[0051] The structure of the cold plate assembly provided in the embodiment of the present application is described in detail below.

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

[0053] The battery cell 220 includes a first area and a second area, the first area is provided with a lead terminal 230, the cooling plate 120 of the cold plate assembly contacts the first area of ​​the battery cell 220, and the heat conducting member 110 of the cold plate assembly contacts the second area of ​​the battery cell 220. The heat generated by the first area is greater than the heat generated by the second area.

[0054] Among them, the heat conductor 110 and the cooling plate 120 are configured to contact different areas of the outer surface of the battery cell 220. The heat conductor 110 and the cooling plate 120 can be in direct contact or indirect contact with the outer surface of the battery cell 220. For example, the indirect contact can be that a heat conductor is arranged between the heat conductor 110 and the cooling plate 120 and the outer surface of the battery cell 220 so that the heat conductor 110 and the cooling plate 120 are in indirect contact with the outer surface of the battery cell 220.

[0055] In the embodiment of the present application, there is no limitation on the number of cooling plates 120. For example, the number of cooling plates 120 may be one, two, three or more.

[0056] For example, if the lead terminal 230 is disposed at only one end of the battery cell 220 , the number of the cooling plate 120 may include at least one, and the cooling plate 120 is in contact with the region where the lead terminal 230 is located.

[0057] Exemplarily, if lead terminals 230 , such as a positive terminal and a negative terminal, are respectively provided at different positions of the battery cell 220 , such as at both ends, then the number of cooling plates 120 may include at least two, and the heat conductor 110 is located between at least two cooling plates 120 .

[0058] Specifically, the first region may include a first sub-region and a second sub-region, the second region is located between the first sub-region and the second sub-region, the positive terminal may be arranged in the first sub-region, and the negative terminal may 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-area may be Figure 2 As shown in area A, the second sub-area can be Figure 2 As shown in area C, the second area can be Figure 2 Shown in area B.

[0060] In this embodiment, two cooling plates 120 are mainly used as an example for description. In this way, it is helpful to cool the high temperature areas at the positive terminal and the negative terminal to the greatest extent, thereby improving the cooling effect of the battery cell 220 and extending the service life and performance of the battery cell 220.

[0061] In the embodiment of the present application, at least part of the heat conductor 110 covers the outer surface of the cooling plate 120. In this way, it is helpful to increase the connection area between the heat conductor 110 and the cooling plate 120, thereby improving the heat conduction efficiency from the heat conductor 110 to the cooling plate 120, and improving the heat dissipation efficiency of the battery 200. Exemplarily, the edges of the heat conductor 110 and the cooling plate 120 can be overlapped. There is no limitation on the overlap area between the heat conductor 110 and the cooling plate 120, and it can be set according to actual needs.

[0062] In the embodiment of the present application, the material of the heat conductor 110 is not limited. For example, the heat conductor 110 can be a material with high thermal conductivity such as copper foil, filter, graphene film, etc. Among them, the heat conduction principle of the heat conductor 110 mainly relies on its special physical structure and material properties to effectively transfer heat and take it away through the external cooling medium to ensure that the battery cell 220 works at the temperature it is subjected to. The heat conduction principle of the cooling plate 120 mainly relies on a cooling medium such as a coolant to exchange heat to achieve heat dissipation.

[0063] Thus, compared with the integrated whole cold plate in the related art, the cold plate assembly 100 in the embodiment of the present application is a combined cold plate. In view of the different heat generation characteristics of different positions of the battery 200, the cold plate assembly 100 is structurally designed in a targeted manner, which is beneficial to reduce the temperature difference between different areas of the battery 200, minimize the temperature difference of the entire battery 200 package, and improve the 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 use of thermal conductive structural adhesive of the cooling plate 120, and the stamping die cost is also greatly reduced, minimizing the cooling cost. Moreover, the cooling amount of the heat conductive member 110 is less than that of the cooling plate 120 relative to the cooling plate 120, and then the use of the heat conductive member 110 in the area with low heat generation helps to reduce the temperature difference of the battery cell 220.

[0064] In an achievable implementation, the manner in which the heat conducting member 110 conducts heat to the cooling plate 120 is not limited. Exemplarily, at least a portion of the heat conducting member 110 and the outer surface of the cooling plate 120 may be directly connected, which helps to directly conduct the heat to the cooling plate 120; Exemplarily, a heat conducting adhesive may be provided between the heat conducting member 110 and the outer surface of the cooling plate 120, and the heat conducting member 110 may conduct the heat to the cooling plate 120 through the heat conducting adhesive; or, the heat conducting member 110 may also conduct the heat to the cooling plate 120 through other heat transfer structures, such as metal parts, etc. This embodiment does not limit this.

[0065] In one possible implementation, referring to Figure 5 and Figure 6 As shown, the cooling plate 120 may have a cooling channel 121 ; at least a portion of the structure of the edge of one side where the heat conducting member 110 is connected to the cooling plate 120 is in contact with the outer surface of the cooling channel 121 .

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

[0067] In the embodiment of the present application, a portion of the structure of the heat conductor 110 is in contact with the outer surface of the cooling channel 121 so that the portion of the structure of the heat conductor 110 covers the cooling channel 121 , which can improve the heat conduction efficiency from the heat conductor 110 to the cooling plate 120 .

[0068] In one possible implementation, referring to Figure 7 As shown, the heat-conducting member 110 may include 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 the outer surface of the battery cell 220; the first covering portion 112 is connected to the heat-conducting body 111, and the first covering portion 112 is respectively connected to the heat-conducting body 111 and the second covering portion 113, and the second covering portion 113 covers the outer surface of the cooling channel 121.

[0069] In the embodiment of the present application, there is no specific limitation on the structures of the heat-conducting body 111, the first covering portion 112, and the second covering portion 113. For example, the first covering portion 112 forms a step relative to the heat-conducting body 111, and the second covering portion 113 forms another step relative to the first covering portion 112, that is, the heights of the heat-conducting body 111, the first covering portion 112, and the second covering portion 113 increase in sequence. This embodiment does not limit this.

[0070] Correspondingly, the height of the cooling plate 120 also increases successively, so that the heat-conducting body 111, the first covering part 112 and the second covering part 113 successively cover the outer surface of the battery cell 220, the edge of the cooling plate 120 facing the heat-conducting body 111 and the outer surface of the cooling channel 121, so that the heat-conducting member 110 can fit the outer surface of the cooling channel 121 to the greatest extent, thereby improving the heat conduction efficiency from the heat-conducting member 110 to the cooling plate 120.

[0071] For example, the heat transfer direction in this embodiment can refer to Figure 7 Indicated by the direction of the arrow.

[0072] In a feasible implementation, in order to further expand the heat dissipation area, at least a portion of the second covering portion 113 covers the outer surface of the cooling plate 120 opposite to the battery cell 220 .

[0073] For example, at least part of the second covering portion 113 may cover the upper surface of the cooling plate 120 opposite to the battery cell; or at least part of the second covering portion 113 may cover the lower surface of the cooling plate 120 opposite to the battery cell. This embodiment is not limited to this. In this way, it is helpful to increase the heat exchange area and further improve the heat conduction efficiency from the heat conductor 110 to the cooling plate 120.

[0074] In one possible implementation, referring to Figures 1 to 4 As shown, the cooling channel 121 may include a plurality of arc segments; the plurality of arc segments are sequentially arranged along the length direction of the cooling plate 120 and connected end to end.

[0075] In the embodiment of the present application, there is no limitation on the number, arrangement and bending direction of the arc segments, and they can be set according to actual needs.

[0076] In this way, through the design of multiple arc segments, the heat dissipation efficiency of the high-heating area of ​​the battery cell 220 can be effectively improved, and the pressure loss of the cooling medium can be reduced. In addition, the flow path of the cooling medium in the cooling channel 121 can be increased, the heat exchange efficiency can be improved, and thus the cooling effect can be enhanced; moreover, this design allows the cooling medium to form a spiral flow inside the cooling channel 121, increasing the contact time between the cooling medium and the tube wall and reducing energy consumption; in addition, it helps to maintain the uniformity of the temperature of the battery 200. By optimizing the channel structure, the temperature difference between the battery 200 monomers can be reduced, avoiding the occurrence of local overheating, thereby improving the safety and stability of the battery 200.

[0077] It should be noted that the cooling channel 121 may include but is not limited to an arc-shaped channel. For example, the cooling channel 121 may also be a straight channel; or, the cooling channel 121 may be a spiral channel; or, the cooling channel 121 may be a U-shaped channel; or, the cooling channel 121 may be a circumferential channel. This embodiment does not limit this.

[0078] In addition, the arrangement of the cooling channels 121 may include a circular arrangement, a serpentine arrangement, a tic-tac-toe arrangement, etc. This embodiment does not limit this, and the arrangement may be made according to actual needs.

[0079] In one possible implementation, referring to Figures 1 to 4 As shown, each cooling plate 120 can be provided with at least two cooling channels 121, and at least two cooling channels 121 are connected in sequence; one of at least two cooling channels 121 is provided with a cooling medium inlet 125, and the other of at least two cooling channels 121 is provided with a cooling medium outlet 126, and 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 embodiment of the present application, the number of cooling channels 121 is not limited. In the present embodiment, two cooling channels 121 are provided for each cooling plate 120 as an example for illustration. One cooling channel 121 is provided with a cooling medium inlet 125, and the other cooling channel 121 is provided with a cooling medium outlet 126. Exemplarily, the cooling medium may be a coolant. This embodiment does not limit this.

[0081] In the embodiment of the present application, 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 pipeline connection and turning; in addition, this design also helps to reduce pressure loss and unnecessary pipeline bending and connection, thereby reducing the overall operating cost and maintenance requirements of the system.

[0082] In one possible implementation, referring to Figure 6 As shown, the cooling plate 120 may include a temperature averaging plate 122 and a flow channel plate 123 , the flow channel plate 123 is connected to the temperature averaging plate 122 , and the heat conducting member 110 is in contact with a side of the flow channel plate 123 facing away from the temperature averaging plate 122 .

[0083] In the embodiment of the present application, the temperature plate 122 is a highly efficient heat conduction device, the main principle of which is based on the phase change heat transfer mechanism, and achieves efficient heat transfer through the evaporation and condensation process of the working fluid.

[0084] In the embodiment of the present application, there is no limitation on the connection method between the temperature averaging plate 122 and the battery cell 220. For example, the temperature averaging plate 122 and the battery cell 220 can be bonded by a thermally conductive structural adhesive 130. In addition, there is no limitation on the connection method between the heat conducting member 110 and the flow channel plate 123. For example, the heat conducting member 110 and the flow channel plate 123 can be bonded.

[0085] In the present application, refer to Figures 1 to 6 As shown, the flow channel plate 123 has a protrusion 124 protruding away from the temperature balancing plate 122, and a cooling flow channel 121 is formed between the protrusion 124 and the temperature balancing plate 122. In this way, there is enough space to accommodate the cooling medium. The protrusion height of the protrusion 124 is not limited.

[0086] In one possible implementation, referring to Figure 8 As shown, the heat conductor 110 covers the area width L of the cooling plate 120, where L ≥ 20 mm. Exemplarily, L can be 20 mm, 25 mm, 30 mm or any value not less than 20 mm. It can be understood that L cannot be infinitely large and can be set according to the actual product. In this way, on the one hand, the bonding reliability of the heating film and the cooling plate 120 is improved, and on the other hand, the two ensure a sufficiently large contact area to improve the efficiency of heat conduction. Preferably, if the size of the area width L of the heat conductor 110 covering the cooling plate 120 is made larger, the heat conductor 110 can also cover the entire cooling plate 120, that is, the area width L of the heat conductor 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 conductor 110 are arranged, thereby further improving the heat transfer efficiency of the heat conductor 110.

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

[0088] If the width of the cooling plate 120 is less than 100 mm, the width of the cooling plate 120 is relatively small, resulting in a smaller contact area between the cooling plate 120 and the high heating area of ​​the battery cell 220, thereby failing to ensure the heat dissipation efficiency of the high heating area of ​​the battery cell 220; if the width of the cooling plate 120 is greater than 300 mm, the width of the cooling plate 120 is relatively large, which may easily cause the cooling plate 120 to partially cover the low heating area, affecting the temperature balance of the battery cell 220.

[0089] Therefore, in this embodiment, 100mm≤H≤300mm is limited, which can not only ensure that the high heat generation area of ​​the battery cell 220 has a higher heat dissipation efficiency, but also will not cover the low heat generation area, which is beneficial to reducing the temperature difference between different areas of the battery 200, minimizing the temperature difference of the entire battery 200, and improving the life and performance of the battery 200.

[0090] In one possible implementation, referring to Fig. 9 As shown, the heat conducting member 110 may include a heat conducting layer 114 , an adhesive layer 115 and an insulating layer 116 , wherein the heat conducting layer 114 is located between the adhesive layer 115 and the insulating layer 116 , and the adhesive layer 115 is configured to bond to the outer surface of the battery cell 220 and the surface of the cooling plate 120 .

[0091] In the embodiment of the present application, there is no limitation on the material of the adhesive layer 115. For example, the adhesive layer 115 can be a high thermal conductivity glue layer, and the glue is directly applied on the thermal conductive layer 114. The adhesive layer 115 adheres the surface of the cooling plate 120 and the outer surface of the battery cell 220, so that it can not only play a role in heat conduction, but also play a role in bonding, thereby ensuring the effective attachment of the thermal conductive member 110 and preventing it from falling off.

[0092] In the embodiment of the present application, the material of the insulating layer 116 is not limited. For example, the polymer insulating layer 116 can be an insulating material such as polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polyimide (PI), etc. 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 the risk of short circuit.

[0093] In the embodiment of the present application, there is no limitation on the material of the heat-conducting layer 114. For example, the heat-conducting layer 114 can be a material with high thermal conductivity such as copper foil, aluminum foil, graphene film, etc. It can be understood that the heat-conducting layer 114 in this embodiment mainly plays a role of heat conduction.

[0094] In an achievable implementation, the thickness of the insulating layer 116 may be greater than or equal to 7 μm and less than or equal to 15 μm. Exemplarily, the thickness of the insulating layer 116 may be 7 μm, 8 μm, 9 μm, 10 μm, 13 μm, 15 μm, or any value between 7 μm and 15 μm.

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

[0096] In the embodiment of the present application, the thickness of the heat conducting layer 114 may be greater than or equal to 7 μm and less than or equal to 20 μm. For example, the thickness of the heat conducting layer 114 may 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-conducting layer 114 is less than 7 μm, the thickness of the heat-conducting layer 114 is too thin, which may lead to poor heat conduction effect, and the heat cannot be effectively taken out of the battery 200, resulting in an increase in the temperature inside the battery 200, which may cause safety problems such as thermal runaway. In addition, a too thin heat-conducting layer 114 may not provide sufficient support and protection, and is easily damaged under vibration or impact, affecting the stability and durability of the battery 200; if the thickness of the heat-conducting layer 114 is greater than 20 μm, it may lead to excessive heat transfer efficiency, causing the temperature of the battery 200 to drop or rise too quickly, which is not conducive to the stable performance of the battery 200, and an overly thick heat-conducting layer 114 may increase the manufacturing cost, which is not conducive to cost control. Therefore, in this embodiment, the thickness of the heat-conducting layer 114 is limited to between 7 μm and 20 μm, which is conducive to improving the heat conduction effect and will not affect the performance and safety of the battery 200.

[0098] In the embodiment of the present application, the thickness of the adhesive layer 115 may 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 may 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 μm, the thickness of the adhesive layer 115 is too small, which may lead to insufficient bonding force, affecting the overall structural stability of the battery 200, and the battery 200 is prone to internal short circuit or structural damage during use, reducing the safety and reliability of the battery 200; if the thickness of the adhesive layer is greater than 25 μm, the thickness of the adhesive layer is too thick, although it can provide stronger bonding force, it may also increase the internal resistance of the battery 200, affecting the service life and performance of the battery 200. In addition, an overly thick adhesive layer will also occupy the space inside the battery 200, reducing the energy density of the battery 200. Therefore, the thickness of the adhesive layer in this embodiment is limited to between 12 μm and 25 μm, which can not only ensure good bonding force, 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. The cold plate assembly is structurally designed in a targeted manner according to the characteristics of different heat generation at different positions of the battery, which is beneficial to reducing the temperature difference between different areas of the battery, minimizing the temperature difference of the entire battery pack, and improving the battery life and performance. In addition, the present application helps to reduce the area of ​​the cooling plate, thereby reducing the material cost, manufacturing cost and usage of the thermal conductive structural adhesive of the cooling plate, and the cost of the stamping die is also greatly reduced, thereby minimizing the cooling cost.

[0101] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0102] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0103] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0104] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cold plate assembly, characterized in that: Used for cooling a battery cell, the cold plate assembly comprises a heat conducting member (110) and a cooling plate (120); the heat conducting member (110) is configured to conduct heat to the cooling plate (120); The heat conducting member (110) and the cooling plate (120) are configured to contact different areas of the outer surface of the battery core; The cooling plate (120) is used to contact a first region of the battery core, and the heat conducting member (110) is used to contact a second region of the battery core; the heat generated by the first region is greater than the heat generated by the second region.

2. The cold plate assembly according to claim 1, characterized in that At least a portion of the heat conducting member (110) covers the outer surface of the cooling plate (120).

3. The cold plate assembly according to claim 2, characterized in that 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 the outer surface of the battery core; the first covering portion (112) respectively connects the heat-conducting body (111) and the second covering portion (113), and at least a portion of the second covering portion (113) covers the outer surface of the cooling plate (120).

4. The cold plate assembly according to claim 3, characterized in that At least a portion of the second covering portion (113) covers the outer surface of the cooling plate (120) opposite to the battery core.

5. The cold plate assembly according to any one of claims 1 to 4, characterized in that: The cooling plate (120) has a cooling channel (121); at least a portion of the structure of the heat conducting element (110) is in contact with an outer surface of the cooling channel (121).

6. The cold plate assembly according to claim 5, characterized in that The cooling channel (121) comprises a plurality of arc segments; the plurality of arc segments are arranged in sequence along the length direction of the cooling plate (120) and are connected end to end.

7. The cold plate assembly according to claim 5, characterized in that Each cooling plate (120) is provided with at least two cooling channels (121), and at least two cooling channels (121) are connected in sequence; at least one of the two cooling channels (121) is provided with a cooling medium inlet (125), and at least another of the two cooling channels (121) is provided with a cooling medium outlet (126), and 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 according to claim 5, characterized in that The cooling plate (120) comprises a temperature balancing plate (122) and a flow channel plate (123); the flow channel plate (123) is connected to the temperature balancing plate (122); the flow channel plate (123) has a protrusion (124) protruding away from the temperature balancing plate (122); the cooling flow channel (121) is formed between the protrusion (124) and the temperature balancing plate (122); the heat conducting element (110) is in contact with a side of the flow channel plate (123) away from the temperature balancing plate (122).

9. The cold plate assembly according to any one of claims 1 to 4, characterized in that: At least a portion of the heat conducting member (110) is directly connected to the outer surface of the cooling plate (120); Alternatively, a heat-conducting adhesive is provided between the heat-conducting element (110) and the outer surface of the cooling plate (120), and the heat-conducting element (110) conducts heat to the cooling plate (120) through the heat-conducting adhesive.

10. The cold plate assembly according to any one of claims 1 to 4, characterized in that: The heat conducting member (110) covers a region width L of the cooling plate (120), wherein L is ≥ 20 mm; and / or, The width of the cooling plate (120) is H, wherein 100 mm ≤ H ≤ 300 mm.

11. The cold plate assembly according to any one of claims 1 to 4, characterized in that: The heat conducting member (110) comprises a heat conducting layer (114), an adhesive layer (115) and an insulating layer (116); the heat conducting layer (114) is located between the adhesive layer (115) and the insulating layer (116); and the adhesive layer (115) is configured to be bonded to the outer surface of the battery cell and the surface of the cooling plate (120).

12. The cold plate assembly according to claim 11, characterized in that The thickness of the insulating layer (116) is greater than or equal to 7 μm and less than or equal to 15 μm; and / or, The thickness of the heat-conducting layer (114) is greater than or equal to 7 μm and less than or equal to 20 μm; and / or, The thickness of the adhesive layer (115) is greater than or equal to 12 μm and less than or equal to 25 μm.

13. The cold plate assembly according to any one of claims 1 to 4, characterized in that: The number of the cooling plates (120) includes at least two, and the heat conducting member (110) is located between at least two of the cooling plates (120); The heat conducting member (110) is configured to conduct heat to at least two cooling plates (120) respectively.

14. A battery, characterized in that: The battery comprises a battery cell and a cold plate assembly according to any one of claims 1 to 13; The battery cell (220) comprises a first area and a second area, a lead terminal (230) is arranged on the first area, the cooling plate (120) of the cold plate assembly contacts the first area of ​​the battery cell (220), and the heat conducting member (110) of the cold plate assembly contacts the second area of ​​the battery cell (220).

15. The battery according to claim 14, characterized in that The battery comprises a shell (210), and the battery cell (220) is arranged in the shell (210); The lead 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 a first sub-region where the positive terminal is located, and the other cooling plate (120) is in contact with a second sub-region where the negative terminal is located.

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