Battery cell group and liquid cooling device thereof

Abstract

The invention provides a battery cell group and a liquid cooling device thereof. The battery cell group comprises a liquid cooling plate, a first interface, a second interface and at least one row of battery cells, the liquid cooling plate is used for forming a flow channel so that cooling liquid can flow in the flow channel. The first connector is used for being communicated with the flow channels so as to introduce cooling liquid into the communicated flow channels. The second connector is used for being communicated with the flow channels so that cooling liquid in the communicated flow channels can flow out of the second connector. Each battery cell is provided with a positive terminal, a negative terminal and a shell; in the battery cell, the positive terminal and the negative terminal are arranged at the same end of the shell. And the first interface is close to one side of the terminal outlet of any row of battery cells. According to the temperature simulation data of the battery cell, the first interface of the liquid cooling device is directionally designed, and the first interface is arranged to be close to one side of the outlet terminal, so that effective and directional heat exchange can be performed on the battery cell, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell assembly and a liquid cooling device thereof. Background Art

[0002] With the rapid development of electric vehicles and energy storage devices, based on considerations of energy storage capacity, the size of battery cells in the battery pack continues to increase, and the battery capacity increases, resulting in an increase in the heat generated by the battery cells during the charging and discharging process, and the need to improve heat dissipation.

[0003] Based on this, the present application provides a battery cell group and a liquid cooling device thereof to improve the relevant technology. Summary of the invention

[0004] The purpose of the present application is to provide a battery cell group and a liquid cooling device thereof, so as to perform effective directional heat exchange on the battery cell group and improve the heat dissipation effect.

[0005] The purpose of this application is achieved by the following technical solutions:

[0006] In a first aspect, the present application provides a battery cell group, the battery cell group comprising:

[0007] A liquid cooling plate, used to form a flow channel so that a cooling liquid flows in the flow channel;

[0008] A first interface, used to be connected to the flow channel so as to introduce the coolant into the connected flow channel;

[0009] A second interface, used to be connected to the flow channel, so that the coolant in the connected flow channel flows out from the second interface;

[0010] At least one row of battery cells, each of which has a positive terminal, a negative terminal and a shell; in the battery cell, the positive terminal and the negative terminal are arranged at the same end of the shell;

[0011] Wherein, the first interface is close to one side of the output terminal of any row of battery cells.

[0012] In some embodiments, the second interface is away from one side of the output terminals of any row of battery cells.

[0013] In some embodiments, the flow channel comprises:

[0014] A first flow channel section, used to be connected to the first interface, the first flow channel section being close to one side of the output terminal of any row of battery cells;

[0015] a second flow channel section, used to be connected to the first flow channel section;

[0016] The third flow channel section is used to be connected to the second flow channel section and the second interface respectively, and the third flow channel section is far away from one side of the output terminal of any row of battery cells.

[0017] In some embodiments, the first interface and the second interface are located at the same end in the arrangement direction of the battery cells; or,

[0018] The first interface and the second interface are located at two ends of the arrangement direction of the battery cells.

[0019] In some embodiments, the liquid cooling plate comprises:

[0020] A flow channel plate, used for forming the flow channel;

[0021] A support plate is located between the flow channel plate and the battery cell, and the support plate is used to support the battery cell.

[0022] In some embodiments, the battery cells are designed in double rows, and the output terminals of the two rows of battery cells are arranged back to back, the number of the first interfaces is 2, and each first interface is close to one side of the output terminals of a row of battery cells.

[0023] In some embodiments, the number of the flow channels and the number of the second interfaces are both 2, the 2 flow channels are independent of each other, each flow channel corresponds to 1 first interface and 1 second interface, and each flow channel corresponds to a row of the battery cells to take away at least part of the heat generated by the corresponding row of the battery cells.

[0024] In some embodiments, at least one of the second interfaces is disposed near a middle position between two rows of the battery cells.

[0025] In some embodiments, the number of the flow channel and the number of the second interface are both 1, and the flow channel corresponds to 2 first interfaces and 1 second interface to take away at least part of the heat generated by the two rows of battery cells.

[0026] In some embodiments, the second interface is disposed near a middle position of two rows of battery cells.

[0027] In some embodiments, the battery cell group further includes an end plate close to an end surface in the arrangement direction.

[0028] In some embodiments, the battery cell group further includes a first thermal insulation layer located between the end plate and the battery cell.

[0029] In some embodiments, the battery cell group further includes a second thermal insulation layer located between two adjacent battery cells in the arrangement direction.

[0030] In a second aspect, the present application provides a liquid cooling device for a battery cell group, the battery cell group comprising the liquid cooling device and at least one row of battery cells, each of the battery cells having a positive terminal, a negative terminal and a shell; in the battery cell, the positive terminal and the negative terminal are arranged at the same end of the shell; the liquid cooling device comprises:

[0031] A liquid cooling plate, used to form a flow channel so that a coolant flows in the flow channel to take away at least part of the heat generated by the battery cell;

[0032] A first interface, used to be connected to the flow channel so as to introduce the coolant into the connected flow channel;

[0033] A second interface, used to be connected to the flow channel, so that the coolant in the connected flow channel flows out from the second interface;

[0034] Wherein, the first interface is close to one side of the output terminal of any row of battery cells.

[0035] The present application provides a battery cell group and a liquid cooling device thereof, wherein the battery cell group includes a liquid cooling plate, a first interface, a second interface and at least one row of battery cells. The liquid cooling plate is used to form a flow channel so that the coolant flows in the flow channel. The first interface is used to connect to the flow channel so as to introduce the coolant into the connected flow channel. The second interface is used to connect to the flow channel so that the coolant in the connected flow channel flows out from the second interface. Each battery cell has a positive terminal, a negative terminal and a shell; in the battery cell, the positive terminal and the negative terminal are arranged at the same end of the shell. Among them, the first interface is close to the output terminal side of the battery cell, and after the coolant enters the flow channel from the first interface, it can preferentially cool the area near the pole where more heat is generated and the temperature is higher. Therefore, according to the temperature simulation data of the battery cell, the first interface of the liquid cooling device is directional designed, and the first interface is arranged close to the output terminal side, so that the coolant can preferentially cool the pole area, and the battery cell group can be effectively and directional heat exchanged, thereby improving the heat dissipation effect of the battery cell group. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present application is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0037] Figure 1 This is a temperature simulation cloud diagram of a battery cell with a single-side output terminal provided in an embodiment of the present application when the working time is 2000 seconds.

[0038] Figure 2 This is a temperature simulation cloud diagram of a battery cell with a single-side output terminal provided in an embodiment of the present application when the working time is 4000 seconds.

[0039] Figure 3 It is a structural schematic diagram of a battery cell group provided in an embodiment of the present application.

[0040] Figure 4 It is an exploded diagram of a battery cell group provided in an embodiment of the present application.

[0041] Figure 5 It is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application.

[0042] Figure 6 It is a structural schematic diagram of a liquid cooling device provided in an embodiment of the present application.

[0043] Figure 7 It is a structural schematic diagram of a battery cell group (1 liquid cooling device) provided in an embodiment of the present application.

[0044] Figure 8 It is a structural schematic diagram of a battery cell group (two liquid cooling devices) provided in an embodiment of the present application.

[0045] Fig. 9 It is a structural schematic diagram of a battery cell group (the first interface and the second interface are located at the same end in the arrangement direction) provided in an embodiment of the present application.

[0046] Fig.10 It is a structural schematic diagram of a battery cell group (the first interface and the second interface are located at both ends of the arrangement direction) provided in an embodiment of the present application.

[0047] Fig.11 It is a structural schematic diagram of a battery cell group (the first interface and the second interface are located at the same end in the output terminal direction) provided in an embodiment of the present application.

[0048] In the figure: 100, rows of battery cells; 101, battery cells; 102, poles; 103, shell; 200, liquid cooling device; 201, first interface; 202, second interface; 203, liquid cooling plate; 204, flow channel plate; 205, support plate; 301, end plate; 302, first thermal insulation layer; 303, second thermal insulation layer. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in the implementation mode of this application. Obviously, the described implementation mode is only a part of the implementation mode of this application, not all the implementation modes. Based on the implementation mode in this application, all other implementation modes obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0050] In the description of the embodiments of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0051] The battery cell can be designed with two-side terminal or one-side terminal. The related heat dissipation design installs a liquid cooling device on the narrow side of the battery cell group to remove the heat generated by the battery cell through the coolant. However, this design lacks specificity in the layout of the interface and fails to fully consider the heat distribution of the battery cell, resulting in unsatisfactory overall heat dissipation effect.

[0052] See also Figure 1 and Figure 2 , Figure 1 This is a temperature simulation cloud diagram of a battery cell 101 with a single-side output terminal provided in an embodiment of the present application when the working time is 2000 seconds. Figure 2 This is a temperature simulation cloud diagram of a battery cell 101 with a single-side output terminal provided in an embodiment of the present application when the working time is 4000 seconds. Figure 1 and Figure 2 In the figure, the z-axis direction is, for example, the (cell) arrangement direction, the y-axis direction is opposite to the terminal direction, and the x-axis direction is perpendicular to the y-axis direction and the z-axis direction.

[0053] It can be seen that for the battery cell 101 with a single-side terminal, according to the battery cell temperature simulation, the temperature on the terminal side is higher than the temperature on the side away from the terminal, which means that the heat generated on the terminal side of the battery cell 101 is greater than the heat generated on the side away from the terminal. Therefore, the first interface 201 is arranged close to the terminal side of the battery cell 101, and the battery cell group is subjected to targeted directional heat exchange, which can effectively improve the heat dissipation effect.

[0054] See also Figures 3 to 6 , Figure 3 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application, Figure 4 is an exploded diagram of a battery cell group provided in an embodiment of the present application, Figure 5 is a schematic diagram of the structure of a battery cell 101 provided in an embodiment of the present application, Figure 6 2 is a schematic diagram of the structure of a liquid cooling device 200 provided in an embodiment of the present application. Figure 6 In the figure, the red dashed arrow indicates the flow direction of the coolant. Figure 5As can be seen in the figure, the shape of the battery cell 101 is relatively flat, and the terminals are on the same side. As an example, the value range of the battery cell length can be 200mm~600mm, the value range of the battery cell height can be 50mm~200mm, and the value range of the battery cell thickness can be 50~60mm. The battery cell 101 can have a shell 103 and two poles 102, and the two poles 102 include a positive terminal and a negative terminal. Since the battery cell 101 in this article adopts a single-side terminal design, the positive terminal and the negative terminal can be set on the same side of the shell 103. For the convenience of description, the first interface 201, the second interface 202 and the liquid cooling plate 203 can be regarded as a whole and referred to as a liquid cooling device 200.

[0055] Please combine Figure 3 and Figure 4 In order to improve the relevant technology, an embodiment of the present application provides a battery cell group, which includes a liquid cooling plate 203, a first interface 201, a second interface 202 and at least one row of battery cells 101. The liquid cooling plate 203 is used to form a flow channel so that the coolant flows in the flow channel. The first interface 201 is used to connect to the flow channel to introduce the coolant into the connected flow channel. The second interface 202 is used to connect to the flow channel so that the coolant in the connected flow channel flows out from the second interface 202. Each of the battery cells 101 has a positive terminal, a negative terminal and a shell 103; in the battery cell 101, the positive terminal and the negative terminal are arranged at the same end of the shell 103. Among them, the first interface 201 is close to the output terminal side of any row of battery cells 101.

[0056] like Figure 5 As shown, in the battery cell 101, the pole 102 (including the positive terminal and the negative terminal) is arranged at the same end of the housing 103. This design makes the battery cell assembly more compact and simplifies the battery cell connection and heat dissipation design. The above embodiment does not limit the number of battery cells 101 in the battery cell group, which can be 2, 10, 100, 200, etc.

[0057] like Figure 6 As shown, the liquid cooling plate 203 is used to form a flow channel so that the coolant flows in the flow channel to take away at least part of the heat generated by the battery cell 101. The first interface 201 is close to the side of the output terminal of any row of battery cells 101, and the first interface 201 is used to connect to the flow channel to introduce the coolant into the connected flow channel. The second interface 202 is used to connect to the flow channel so that the coolant in the connected flow channel flows out from the second interface 202.

[0058] In some embodiments, the second interface 202 may be located away from the output terminal of any row of cells 101. That is, the second interface 202 may be located away from the output terminal. Figure 3 and Figure 4 In some other embodiments, the second interface 202 may be close to one side of the output terminal of any row of battery cells 101 .

[0059] At least part of the heat generated by the battery cell 101 may be part of the heat or all of the heat generated by the battery cell 101. The coolant may be water, a water / ethylene glycol mixture, mineral oil, a fluorine-containing coolant, etc., and the above embodiment is not limited to this. A channel for the flow of coolant is designed inside the liquid cooling plate 203. The first interface 201 is the entrance for the coolant to enter the liquid cooling plate 203, and can be set at a position that needs priority cooling. The position that needs priority cooling is, for example, a position where more heat is generated, or an area where more heat is generated, such as the side of the output terminal (or the pole area). The first interface 201 is close to the side of the output terminal of any row of battery cells 101, and can be located at both ends, the middle position or other positions in the arrangement direction. The second interface 202 is the outlet of the coolant leaving the liquid cooling plate 203, and can be set on the side away from the terminal, or the second interface 202 can also be set at other positions such as the side of the output terminal, as long as the flow channel design can fully cover the area that needs to be cooled, ensuring that the coolant fully takes away the heat generated by the battery cell 101.

[0060] In the above embodiment, the two poles 102 of the battery cell 101 are arranged at the same end of the shell 103, so that the battery cell 101 is more compact when arranged, and it is convenient to uniformly manage heat dissipation. The first interface 201 is close to the side of the output terminal of any row of battery cells 101, so as to preferentially cool the area near the pole 102 that generates more heat and has a higher temperature, achieve efficient heat dissipation, and improve the heat dissipation effect. Since the heat generated in different areas of the battery cell 101 is different, the first interface 201 in the above battery cell group adopts a directional design. Specifically, according to the distribution of heat generated in different areas of the battery cell 101, the position of the first interface 201 is reasonably arranged so that it is close to the pole area that generates more heat, so as to preferentially take away the heat generated in the pole area and improve the heat dissipation effect. The above embodiment significantly improves the heat dissipation efficiency of the battery cell 101 by optimizing the structural layout of the first interface 201, especially on the side of the output terminal of any row of battery cells 101, which generates more heat and has a higher temperature. The first interface 201 is arranged close to the side of the output terminal, which can quickly take away the heat from the side of the output terminal, reduce the risk of local overheating, and make the temperature distribution more balanced. The single-side terminal design makes the battery cells more compact, helping to improve the overall energy density and space utilization of the battery pack.

[0061] See also Figure 7 and Figure 8 , Figure 7 2 is a schematic diagram of the structure of a battery cell group (a liquid cooling device 200) provided in an embodiment of the present application. Figure 8It is a schematic structural diagram of a battery cell group (two liquid cooling devices 200) provided in an embodiment of the present application.

[0062] In some embodiments, one or more rows of battery cells 101 are used as a row of battery cells 100, and the row of battery cells 100 has two oppositely positioned narrow thickness surfaces (the thicknesses corresponding to the two narrow thickness surfaces are the smallest in three directions of the row of battery cells 100), and the liquid cooling device 200 can be disposed on the narrow thickness surfaces of the row of battery cells 100. Figure 7 As shown, as an example, the number of liquid cooling devices 200 is one, which is arranged on one of the narrow thickness surfaces. Figure 8 As shown, as another example, the number of the liquid cooling devices 200 is two, which are respectively arranged on the two narrow thickness surfaces, that is, a liquid cooling device 200 is arranged on each narrow thickness surface to further improve the heat dissipation effect.

[0063] See also Figures 9 to 11 , Fig. 9 2 is a schematic diagram of the structure of a battery cell group (the first interface 201 and the second interface 202 are located at the same end of the arrangement direction) provided in an embodiment of the present application. Fig.10 2 is a schematic diagram of the structure of a battery cell group (the first interface 201 and the second interface 202 are located at two ends of the arrangement direction) provided in an embodiment of the present application. Fig.11 2 is a schematic diagram of the structure of a battery pack (the first interface 201 and the second interface 202 are located at the same end of the output terminal direction) provided in an embodiment of the present application. Figures 9 to 11 In the figure, the direction of the red dashed arrow is used to indicate the flow direction of the coolant. The arrangement direction refers to the arrangement direction of the battery cell 101 in the battery cell group. The terminal output direction is the direction of the lead-out terminal, for example, parallel to the length direction of the battery cell 101.

[0064] like Fig. 9 As shown, in some embodiments, the first interface 201 and the second interface 202 can be located at the same end in the arrangement direction of the battery cell 101. The first interface 201 and the second interface 202 are located at the same end in the arrangement direction of the battery cell, so that the coolant can enter and flow out from the same side of the battery cell group. At this time, the flow path of the flow channel and the coolant has a U-shaped shape, for example. In practical applications, the flow channel can be specifically designed so that the flow channel passes through more areas on the side of the output terminal. As an example, the flow channel, for example, includes a plurality of flow channel sections connected in sequence, and the flow channel section connected to the first interface 201 is, for example, parallel to the arrangement direction. Assuming that the length of one side of the output terminal of each row of battery cells is L1, assuming that the length of the flow channel section connected to the first interface 201 is L2, the ratio of L2 to L1 can be greater than the target ratio. Among them, the target ratio is, for example, 0.7, 0.8, 0.9, 0.95, etc., and the above embodiments are not limited to this.

[0065] In some embodiments, the flow channel includes a first flow channel section, a second flow channel section, and a third flow channel section. The first flow channel section is used to connect to the first interface 201, and the first flow channel section is close to the output terminal side of any row of battery cells 101. The second flow channel section is used to connect to the first flow channel section. The third flow channel section is used to connect to the second flow channel section and the second interface 202 respectively, and the third flow channel section is far away from the output terminal side of any row of battery cells 101. In the above embodiment, the flow channel section connected to the first interface 201 is the first flow channel section.

[0066] like Fig.10 As shown, in other embodiments, the first interface 201 and the second interface 202 may be located at both ends of the arrangement direction of the battery cells 101. The first interface 201 and the second interface 202 are located at both ends of the arrangement direction of the battery cells, so that the coolant can enter from one side of the battery cell group and flow out from the other side. At this time, the flow channel and the flow path of the coolant have, for example, a serpentine or straight shape.

[0067] like Fig.11 As shown, in some other embodiments, the first interface 201 and the second interface 202 may be located at the same end in the direction of the terminal output of the battery cell 101. The first interface 201 and the second interface 202 are located at the same end in the direction of the terminal output of the battery cell, so that the coolant can quickly take away the heat near the pole 102. At this time, the flow channel and the flow path of the coolant have, for example, a shape that is approximately annular.

[0068] In the above embodiment, the positions of the first interface 201 and the second interface 202 are optimized and arranged. By reasonably optimizing the position layout of the first interface 201 and the second interface 202, the coolant can efficiently take away the heat generated by the battery cell 101, especially the heat generated on the side of the output terminal where more heat is generated, and the temperature increase of the pole area of ​​the battery cell 101 is targeted to reduce the risk of local overheating. In addition, the arrangement of the first interface 201 and the second interface 202 at different positions also provides design flexibility. Users can flexibly design the flow channel according to the performance requirements and cost requirements in actual applications, so that the liquid cooling device 200 can be customized according to actual needs, which improves the practicality and scope of application of the liquid cooling device 200 and further enhances the application prospects of the battery cell group.

[0069] Please combine Figure 4 and Figure 6 In some embodiments, the liquid cooling plate 203 may include a flow channel plate 204 and a support plate 205. The flow channel plate 204 is used to form the flow channel. The support plate 205 is located between the flow channel plate 204 and the battery cell 101, and the support plate 205 is used to support the battery cell 101. The above embodiment does not limit the number of flow channels formed by the flow channel plate 204, which may be 1, 2 or more, for example.

[0070] In some embodiments, the end surface of the support plate 205 used to support the battery cell 101 may be coated with structural adhesive for bonding the battery cell 101 .

[0071] Among them, the flow channel plate 204 is used to form a flow channel, and guides the flow of coolant through the channel inside it to take away the heat of the battery cell 101. The support plate 205 is located between the flow channel plate 204 and the battery cell 101, and is used to provide mechanical support, for example, to hold up the battery cell 101. In the above embodiment, the coolant flows through the flow channel of the flow channel plate 204, enters from the first interface 201, flows through the battery cell 101 and takes away the heat, and then flows out from the second interface 202 to achieve efficient heat dissipation. The flow channel plate 204 and the support plate 205 adopt a split design, which is simple in structure, easy to implement in process, and low in cost.

[0072] The related liquid cooling design of battery packs has some shortcomings in structure and heat dissipation efficiency. Whether it is a single-row battery design or a double-row battery design, it is difficult to effectively and directionally cool the pole area of ​​each row of batteries where more heat is generated. By optimizing the liquid cooling structure of single-row and double-row batteries, the heat dissipation efficiency can be improved, the battery structure can be simplified, and the cost can be reduced.

[0073] like Figures 8 to 10 As shown, in some embodiments, the battery cell 101 can adopt a single-row design, and the number of the flow channel, the first interface 201 and the second interface 202 are all 1. The first interface 201 is arranged close to the pole 102 of the battery cell 101. The single-row design means that the battery cells 101 in the battery cell group are arranged in a single row, and the output terminal directions of all battery cells 101 are consistent, forming one side of the battery cell group that is close to the output terminal and one side that is away from the terminal. For the single-row design, the first interface 201 is close to the output terminal side of the battery cell 101, so that the coolant can preferentially take away the heat from the pole area, and the coolant flows through the battery cell 101 through the flow channel and is discharged from the second interface 202.

[0074] like Figure 3 and Figure 4As shown, in other embodiments, the battery cells 101 may adopt a double-row design, and the terminals of the two rows of battery cells 101 are arranged in back-to-back arrangement, and the number of the first interfaces 201 is 2, and each first interface 201 is close to one side of the terminals of a row of battery cells 101. The double-row design means that the battery cells 101 in the battery cell group are arranged in double rows, and the terminals of all battery cells 101 in the same row are in the same direction. The poles 102 of the two rows of battery cells 101 are arranged in back-to-back arrangement. As an example, the terminals of the two rows of battery cells 101 are respectively located at the two ends of the width direction of the battery cell group, and the sides of the two rows of battery cells 101 away from the terminals are close to the middle position of the width direction of the battery cell group. In the double-row design, the poles 102 of the two rows of battery cells 101 are arranged back to back, and the number of first interfaces 201 is 2. Each first interface 201 is close to one side of the output terminal of a row of battery cells, that is, each row of battery cells 101 has an independent first interface 201, so that the pole area of ​​each row of battery cells can be effectively cooled, which improves the problem of uneven heat dissipation and makes the heat dissipation effect more balanced.

[0075] In some other embodiments, the battery cells 101 may be designed in N rows, and the output terminals of all the battery cells 101 in the same row have the same direction, the number of the first interfaces 201 is N, each first interface 201 is close to one side of the output terminals of a row of the battery cells 101, and N is an integer greater than 2. In some embodiments, the output terminals of any adjacent rows of the battery cells 101 are in opposite directions, for example, the output terminals of each row of battery cells 101 are arranged in an alternating manner in the width direction of the battery cell group. In other embodiments, the output terminals of N rows of battery cells 101 have the same direction.

[0076] like Figure 6 As shown, in some embodiments, the number of the flow channels and the second interface 202 are both 2, the 2 flow channels are independent of each other, each flow channel corresponds to 1 first interface 201 and 1 second interface 202, and each flow channel corresponds to a row of the battery cells 101 to take away at least part of the heat generated by the corresponding row of the battery cells 101. In some embodiments, at least one of the second interfaces 202 can be arranged near the middle position of the two rows of the battery cells 101. That is, one or both of the two second interfaces 202 are arranged near the middle position of the two rows of the battery cells 101.

[0077] In the above embodiment, the two flow channels are independent of each other, for example, the first flow channel and the second flow channel. Each flow channel corresponds to one first interface 201 and one second interface 202, and each flow channel corresponds to a row of battery cells 101. The heat dissipation efficiency of the double-row battery cells 101 is significantly improved by independent flow channel design and optimization of the position layout of the second interface 202. Each flow channel independently corresponds to a row of battery cells 101, ensuring that the coolant can effectively take away the heat generated by each row of battery cells 101. The design of the second interface 202 close to the middle position of the two rows of battery cells 101 allows the coolant to more evenly take away the heat from the middle area of ​​the two rows of battery cells 101.

[0078] In some embodiments, the liquid cooling plate 203 may adopt an integrated liquid cooling plate, and the integrated liquid cooling plate is used to form the first flow channel and the second flow channel. That is to say, although the first flow channel and the second flow channel are independent of each other, two flow channels can be provided by an integrated liquid cooling plate. The use of an integrated liquid cooling plate integrates the first flow channel and the second flow channel into the same structural member, reduces the number of structural members, and simplifies the overall structural design. Secondly, the integrated design reduces the number of parts and assembly processes, thereby reducing manufacturing and assembly costs. In addition, the integrated liquid cooling plate reduces the number of connection parts, reduces the risk of leakage of the coolant, and improves the sealing and overall reliability.

[0079] In other embodiments, the number of the liquid cooling plates 203 can be 2, and the first flow channel and the second flow channel are formed by using two liquid cooling plates respectively. The use of two independent liquid cooling plates 203 can be flexibly adjusted and configured according to different needs and application scenarios. Secondly, the independent liquid cooling plate design makes the maintenance and replacement of each flow channel more convenient, reducing maintenance time and cost. In addition, the two liquid cooling plates 203 work independently, reducing the thermal interference between the flow channels, helping to more accurately control the cooling effect of each flow channel, and can better achieve independent heat dissipation of different battery cell areas, improve heat dissipation uniformity and efficiency, and thus improve overall heat dissipation performance.

[0080] The two second interfaces 202 in the above embodiment are combined into one second interface 202 to form an internally conductive flow channel, which can save costs. In other embodiments, the number of the flow channel and the second interface 202 is 1, and the flow channel corresponds to two first interfaces 201 and one second interface 202 to take away at least part of the heat generated by the two rows of battery cells 101. That is, two first interfaces 201 share one second interface 202. In some embodiments, the second interface 202 can be set near the middle position of the two rows of battery cells 101. It should be noted that in this article, the interior of the same flow channel is connected. The flow channel corresponds to two first interfaces 201 and one second interface 202, which means that the flow channel is connected to two first interfaces 201 and one second interface 202 respectively. Compared with the first and second flow channels separately set above, it can be regarded as that the two flow channels share a liquid outlet channel. In addition, the liquid cooling plate 203 can use an integrated liquid cooling plate or a split liquid cooling plate to form the above flow channel, which will not be repeated here.

[0081] In the above embodiment, the number of flow channels and second interfaces 202 are both one. The flow channel is internally conductive, corresponding to two first interfaces 201 and one second interface 202. The coolant enters the flow channel through the two first interfaces 201 respectively, flows through the two rows of battery cells 101, takes away the heat generated by the battery cells 101, and then is discharged through the second interface 202, for example, located in the middle of the two rows of battery cells 101. By combining the second interface 202 and the internal conductive flow channel design, the liquid cooling structure design of the battery cell group is simplified, saving manufacturing and maintenance costs. Two first interfaces 201 correspond to one second interface 202, and the second interface 202 is located in the middle of the two rows of battery cells 101, ensuring that the coolant can evenly take away the heat generated by the two rows of battery cells 101.

[0082] like Figure 4 As shown, in some embodiments, the battery cell group may further include an end plate 301 close to the end face in the arrangement direction for subsequent battery cluster connection design. For example, the battery cell group has two opposite end faces in the arrangement direction, and an end plate 301 is arranged on one or both of the end faces to provide mechanical support and facilitate the connection of at least one row of battery cell groups to form a battery cluster. In some embodiments, the cross-section of the end plate 301 is, for example, U-shaped, that is, the end plate 301 can be designed as a U-shaped end plate 301.

[0083] like Figure 4 As shown, in some embodiments, the battery cell group may further include a first thermal insulation layer 302 located between the end plate 301 and the battery cell 101. The first thermal insulation layer 302 is, for example, aerogel, which is used for thermal insulation and reduces heat conduction to the end plate 301. Aerogel, as a thermal insulation material, has excellent thermal insulation performance.

[0084] like Figure 4 As shown, in some embodiments, the battery cell group may further include a second thermal insulation layer 303 located between two adjacent battery cells 101 in the arrangement direction. The second thermal insulation layer 303 is, for example, aerogel, for thermal insulation to reduce heat conduction between the battery cells 101.

[0085] Please combine Figures 4 to 6 , the embodiment of the present application also provides a liquid cooling device 200 for a battery cell group, the battery cell group includes the liquid cooling device 200 and at least one row of battery cells 101. Each of the battery cells 101 has a positive terminal, a negative terminal and a shell 103, and in the battery cell 101, the positive terminal and the negative terminal are arranged at the same end of the shell 103. The liquid cooling device 200 includes a liquid cooling plate 203, a first interface 201 and a second interface 202. The liquid cooling plate 203 is used to form a flow channel so that the coolant flows in the flow channel and takes away at least part of the heat generated by the battery cell 101. The first interface 201 is close to the output terminal side of any row of battery cells 101, and the first interface 201 is used to connect to the flow channel to introduce the coolant into the connected flow channel. The second interface 202 is used to connect to the flow channel so that the coolant in the connected flow channel flows out from the second interface 202.

[0086] In some embodiments, the second interface 202 may be away from one side of the output terminals of any row of battery cells 101 .

[0087] In some embodiments, the flow channel includes a first flow channel section, a second flow channel section, and a third flow channel section. The first flow channel section is used to connect to the first interface 201, and the first flow channel section is close to the output terminal side of any row of battery cells 101. The second flow channel section is used to connect to the first flow channel section. The third flow channel section is used to connect to the second flow channel section and the second interface 202 respectively, and the third flow channel section is far away from the output terminal side of any row of battery cells 101.

[0088] In some embodiments, the first interface 201 and the second interface 202 may be located at the same end in the arrangement direction of the battery cells 101 ; or, the first interface 201 and the second interface 202 may be located at two ends in the arrangement direction of the battery cells 101 .

[0089] In some embodiments, the liquid cooling plate 203 may include a flow channel plate 204 and a support plate 205. The flow channel plate 204 is used to form the flow channel. The support plate 205 is located between the flow channel plate 204 and the battery cell 101, and the support plate 205 is used to support the battery cell 101.

[0090] In some embodiments, the battery cell 101 may be designed in a single row, and the number of the flow channel, the first interface 201 and the second interface 202 are all one.

[0091] In some embodiments, the battery cells 101 may be designed in a double row, and the output terminals of the two rows of battery cells 101 are arranged facing each other, the number of the first interfaces 201 is 2, and each first interface 201 is close to one side of the output terminals of a row of battery cells 101.

[0092] In some embodiments, the number of the flow channels and the number of the second interfaces 202 are both two, the two flow channels are independent of each other, each flow channel corresponds to one first interface 201 and one second interface 202, and each flow channel corresponds to a row of the battery cells 101 to take away at least part of the heat generated by the corresponding row of the battery cells 101. In some embodiments, at least one of the second interfaces 202 can be disposed near the middle of two rows of the battery cells 101.

[0093] In some embodiments, the number of the flow channel and the second interface 202 is 1, and the flow channel corresponds to 2 first interfaces 201 and 1 second interface 202, so as to take away at least part of the heat generated by the two rows of battery cells 101. In some embodiments, the second interface 202 can be arranged near the middle position of the two rows of battery cells 101.

[0094] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0095] It should be noted that the above-mentioned "terminal output side" refers to the side of the battery cell shell where the positive terminal / negative terminal is set; similarly, the above-mentioned "side away from the terminal" refers to the side of the battery cell shell opposite to the above-mentioned "terminal output side".

[0096] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0097] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “under” another element, it can be “directly on” or “under” the other element or intervening elements may be present.

[0098] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0099] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A battery cell group, characterized in that: The battery pack comprises: A liquid cooling plate, used to form a flow channel so that a cooling liquid flows in the flow channel; A first interface, used to be connected to the flow channel so as to introduce the coolant into the connected flow channel; A second interface, used to be connected to the flow channel, so that the coolant in the connected flow channel flows out from the second interface; At least one row of battery cells, each of which has a positive terminal, a negative terminal and a shell; in the battery cell, the positive terminal and the negative terminal are arranged at the same end of the shell; Wherein, the first interface is close to one side of the output terminal of any row of battery cells.

2. The battery pack according to claim 1, characterized in that: The second interface is away from one side of the output terminals of any row of battery cells.

3. The battery pack according to claim 1, characterized in that: The flow channel comprises: A first flow channel section, used to be connected to the first interface, the first flow channel section being close to one side of the output terminal of any row of battery cells; a second flow channel section, used to be connected to the first flow channel section; The third flow channel section is used to be connected to the second flow channel section and the second interface respectively, and the third flow channel section is far away from one side of the output terminals of any row of battery cells.

4. The battery pack according to claim 1, characterized in that: The first interface and the second interface are located at the same end in the arrangement direction of the battery cells; or, The first interface and the second interface are located at two ends of the arrangement direction of the battery cells.

5. The battery pack according to claim 1, characterized in that: The liquid cooling plate comprises: A flow channel plate, used for forming the flow channel; A support plate is located between the flow channel plate and the battery cell, and the support plate is used to support the battery cell.

6. The battery cell assembly according to any one of claims 1 to 5, characterized in that: The battery cells are designed in double rows, and the output terminals of the two rows of battery cells are arranged in opposite directions. The number of the first interfaces is 2, and each first interface is close to one side of the output terminals of a row of battery cells.

7. The battery pack according to claim 6, characterized in that: The number of the flow channels and the number of the second interfaces are both 2, the 2 flow channels are independent of each other, each flow channel corresponds to 1 first interface and 1 second interface, and each flow channel corresponds to a row of the battery cells to take away at least part of the heat generated by the corresponding row of the battery cells.

8. The battery pack according to claim 7, characterized in that: At least one of the second interfaces is disposed near a middle position between two rows of battery cells.

9. The battery cell assembly according to claim 6, characterized in that: The number of the flow channel and the number of the second interface are both 1, and the flow channel corresponds to 2 first interfaces and 1 second interface, so as to take away at least part of the heat generated by the two rows of battery cells.

10. The battery pack according to claim 9, characterized in that: The second interface is arranged near the middle position of the two rows of battery cells.

11. The battery pack according to claim 1, characterized in that: The battery cell group further includes an end plate close to the end surface in the arrangement direction.

12. The battery pack according to claim 11, characterized in that: The battery cell group further includes a first heat insulation layer located between the end plate and the battery cells.

13. The battery cell assembly according to claim 1, characterized in that: The battery cell group further includes a second heat insulation layer located between two adjacent battery cells in the arrangement direction.

14. A liquid cooling device for a battery cell group, characterized in that: The battery cell group includes the liquid cooling device and at least one row of battery cells, each of which has a positive terminal, a negative terminal and a shell; in the battery cell, the positive terminal and the negative terminal are arranged at the same end of the shell; the liquid cooling device includes: A liquid cooling plate, used to form a flow channel so that a coolant flows in the flow channel to take away at least part of the heat generated by the battery cell; A first interface, used to be connected to the flow channel so as to introduce the coolant into the connected flow channel; A second interface, used to be connected to the flow channel, so that the coolant in the connected flow channel flows out from the second interface; Wherein, the first interface is close to one side of the output terminal of any row of battery cells.

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