Battery module and battery pack

Abstract

The utility model relates to a battery module and a battery pack, comprising: a battery cell group comprising a plurality of battery cells arranged along a first direction, at least one end of each battery cell along a second direction being provided with a pole, the first direction being the length direction of the battery cell group, the second direction being the width direction of the battery cell group; the busbar is arranged at the end part of the battery cell group, which is provided with the pole along the second direction; a plurality of busbars are arranged, and each busbar is electrically connected with the pole columns of two adjacent battery cells in the first direction; the circuit board is arranged at one end of the battery cell group along a third direction, the circuit board extends along the first direction and is arranged close to one side of the pole, the busbar is connected with the circuit board, and the third direction is the height direction of the battery cell group; and the first liquid cooling plate is arranged on one side of the busbar along the second direction so as to carry out heat dissipation on the busbar and the pole. When the area of the busbar is enlarged to improve the overcurrent capability and the heat dissipation capability, the width of the circuit board on the top surface of the battery cell group is not limited.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module and a battery pack. Background Technology

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles is gradually increasing. As a result, the application of power batteries, the core component of new energy vehicles, is becoming increasingly widespread in people's lives.

[0003] As new energy vehicles demand increasingly faster charging speeds, the area of ​​busbars is gradually increasing to improve current flow and heat dissipation. In traditional technology, both the busbar and the circuit board are located on the same surface of the battery cell with terminals, and the circuit board is often placed between two rows of busbars. This arrangement limits the width of the circuit board, making it unsuitable for use. Utility Model Content

[0004] Therefore, it is necessary to address the problem that the structural design of batteries in traditional technologies restricts the width of the circuit board, causing the circuit board to fail to meet usage requirements. A battery module and battery pack with less restriction on the width of the circuit board should be provided so that the circuit board can meet usage requirements.

[0005] On one hand, this application provides a battery module, including:

[0006] A battery cell assembly includes a plurality of battery cells arranged along a first direction, each of the battery cells having a terminal post at at least one end along a second direction, the first direction being the length direction of the battery cell assembly, and the second direction being the width direction of the battery cell assembly;

[0007] A busbar is provided at the end of the battery cell assembly having the terminal post along the second direction; multiple busbars are provided, and each busbar is electrically connected to the terminal posts of two adjacent battery cells in the first direction;

[0008] A circuit board is disposed at one end of the battery cell assembly along a third direction, and the circuit board extends along the first direction and is disposed on one side close to the electrode post. The busbar is connected to the circuit board, and the third direction is the height direction of the battery cell assembly.

[0009] A first liquid cooling plate is disposed on one side of the busbar along the second direction to dissipate heat from the busbar and the electrode.

[0010] In one embodiment, the busbar includes a first connecting portion, a curved portion, and a second connecting portion connected in sequence, wherein the first connecting portion and the second connecting portion are respectively opposite to two adjacent battery cells on the side of the battery cell closer to the battery cell along the second direction;

[0011] The curved portion arches away from the battery cell along the second direction relative to the first connecting portion and the second connecting portion, and the curved portion is positioned opposite to the two adjacent battery cells.

[0012] In one embodiment, the circuit board includes a main body and connecting pieces, the main body being disposed at one end of the battery cell assembly along the third direction, and the connecting pieces being arranged sequentially at intervals along the first direction;

[0013] One end of each connector is connected to the main body, and the other end is bent along the third direction to connect to the busbar.

[0014] In one embodiment, the battery cell assembly has a positive terminal block and a negative terminal block at at least one end along the second direction, the positive terminal block and the negative terminal block are spaced apart along the third direction, the positive terminal block includes a plurality of positive terminals arranged along the first direction and on the same horizontal line, and the negative terminal block includes a plurality of negative terminals arranged along the first direction and on the same horizontal line.

[0015] Each of the busbars includes a first conductive sheet, a second conductive sheet, and a connecting strip. The first conductive sheet is connected to the positive terminal, the second conductive sheet is connected to the negative terminal, and the connecting strip connects the first conductive sheet and the second conductive sheet.

[0016] In one embodiment, the busbar is I-shaped, the first conductive sheet and the second conductive sheet completely cover the terminal post electrically connected to it, and the dimensions of the first conductive sheet and the second conductive sheet along the first direction are equal to the dimensions of the battery cell along the first direction;

[0017] and / or

[0018] The dimension of the bus along the third direction is equal to the dimension of the cell along the third direction.

[0019] In one embodiment, the battery cell assembly has a first terminal block and a second terminal block at at least one end along the second direction, the first terminal block and the second terminal block are arranged at intervals along the third direction, and both the first terminal block and the second terminal block include positive terminal blocks and negative terminal blocks arranged alternately along the first direction.

[0020] Each of the busbars is in the shape of a straight line, and each of the two ends of the busbar is connected to the adjacent positive terminal and the negative terminal in the first terminal block or the second terminal block, respectively.

[0021] In one embodiment, the busbar has an insulating layer on the side away from the pole in the second direction.

[0022] In one embodiment, the battery module further includes a thermally conductive layer disposed between the first liquid cooling plate and the busbar to conduct heat between the first liquid cooling plate and the busbar.

[0023] In another aspect, this application provides a battery pack, including the battery module as described above.

[0024] In one embodiment, the battery pack further includes a second liquid cooling plate disposed at the bottom end of the battery module away from the circuit board along the third direction;

[0025] and / or

[0026] The battery pack also includes a third liquid cooling plate, which is disposed at the top of the battery module along the third direction where the circuit board is located, and the circuit board is located between the cell group and the third liquid cooling plate.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] The circuit board is located on the top surface of the battery cell assembly, while the terminals and busbars are located on the sides. This means the busbars and circuit board are on different sides of the battery cell assembly. When the busbar area is increased to improve current carrying capacity and heat dissipation, the busbar placement does not limit the width of the circuit board on the top surface of the battery cell assembly, ensuring that the circuit board width always meets usage requirements. Simultaneously, the first liquid cooling plate dissipates heat from the busbars and terminals, preventing them from overheating and ensuring the safe operation of the battery module. Attached Figure Description

[0029] Figure 1 This is a structural diagram of a battery module provided in one embodiment of this application;

[0030] Figure 2 This is a structural diagram of a battery module according to another embodiment of this application;

[0031] Figure 3 for Figure 2 An exploded view of the battery module shown;

[0032] Figure 4 for Figure 2 A structural diagram of the battery module shown from another perspective;

[0033] Figure 5 This is a structural diagram of a battery module provided in another embodiment of this application;

[0034] Figure 6 for Figure 5 A structural diagram of the battery module shown from another perspective;

[0035] Figure 7 for Figure 5 An exploded view of the battery module shown;

[0036] Figure 8 An exploded view of a battery pack provided in an embodiment of this application;

[0037] Figure 9 for Figure 8 An exploded view of the specific structure of the battery pack shown.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1000, Battery Pack; 100, Battery Module; 10, Cell Pack; 11, Cell; 111, Terminal Post; 111a, Positive Terminal Post; 111b, Negative Terminal Post; 21, Busbar; 211, First Connecting Part; 212, Second Connecting Part; 213, Bend; 214, First Conductive Sheet; 215, Second Conductive Sheet; 216, Connecting Strip; 22, Separator Plate; 221, Through Hole; 30, Circuit Board; 31, Main Body; 32, Connecting Sheet; 40, First Liquid Cooling Plate; 200, Second Liquid Cooling Plate; 300, Third Liquid Cooling Plate; 400, Housing; A, Positive Terminal Post; B, Negative Terminal Post; C, First Terminal Post; D, Second Terminal Post; X, First Direction; Y, Second Direction; Z, Third Direction. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0046] See Figure 1 One embodiment of this application provides a battery module 100, including a cell assembly 10. The cell assembly 10 includes a plurality of cells 11 arranged along a first direction X, where the first direction X is the length direction of the cell assembly 10. That is, the cell assembly 10 has a plurality of cells 11 stacked along the first direction X, such as two cells 11, three cells 11, four cells 11, or more than four cells 11 stacked.

[0047] See Figure 2Each cell 11 has a terminal post 111 at at least one end along the second direction Y, which is the width direction of the cell assembly 10 and is perpendicular to the length direction. That is, the cell 11 is a cell with a terminal post 111 extending from its side. (See reference...) Figure 3 In some specific embodiments, each cell 11 has terminals 111 at both ends along the second direction Y. Optionally, each end has a positive terminal 111a and a negative terminal 111b, in which case the cell 11 is a four-terminal cell 111. The four-terminal cell 111 has a larger current-carrying area, thereby reducing contact resistance and improving the overall performance of the battery. In other specific embodiments, each cell 11 may also have a terminal 111 at one end along the first direction X. Optionally, this end has a positive terminal 111a and a negative terminal 111b, in which case the cell 11 is a two-terminal cell 111.

[0048] Continue reading Figure 1 and Figure 2 The battery module 100 also includes a busbar 21, which is located at the end of the cell assembly 10 having terminals 111 along the second direction Y. That is, the busbar 21 is located on the side of the cell assembly 10. There are multiple busbars 21, and each busbar 21 is electrically connected to the terminals 111 of two adjacent cells 11 in the first direction X. Thus, the series, parallel, or mixed connection of the cells 11 in the cell assembly 10 is achieved through the busbar 21.

[0049] It should be noted that, since the busbar 21 is located outside the pole 111, the heat of the pole 111 can be dissipated through the busbar 21.

[0050] Continue reading Figure 2 and Figure 3 The battery module 100 also includes a circuit board 30, which is located at one end of the cell assembly 10 along the third direction Z. The circuit board 30 extends along the first direction X and is located near the side of the terminal post 111. The busbar 21 is connected to the circuit board 30. The third direction Z is the height direction of the cell assembly 10. The length, width and height directions of the cell assembly 10 are perpendicular to each other.

[0051] Optionally, the circuit board 30 includes a main body 31 and connecting pieces 32. The main body 31 is disposed at one end of the battery cell assembly 10 along a third direction Z, and the connecting pieces 32 are arranged sequentially at intervals along a first direction X. One end of each connecting piece 32 is connected to the main body 31, and the other end is bent along the third direction Z to connect to the busbar 21. The connecting piece 32 may be a nickel sheet.

[0052] In the above configuration, the circuit board 30 is located on the top surface of the battery cell assembly 10, and the terminal post 111 and the bus 21 are located on the side of the battery cell assembly 10. That is, the bus 21 and the circuit board 30 are located on different sides of the battery cell assembly 10. When the area of ​​the bus 21 is increased to improve the current carrying capacity and heat dissipation capacity, the configuration of the bus 21 will not limit the width of the circuit board 30 (the dimension of the circuit board 30 along the second direction Y) located on the top surface of the battery cell assembly 10, so that the width of the circuit board 30 can always meet the usage requirements.

[0053] In some embodiments, the battery module 100 further includes an isolation plate 22, which is disposed at the end of the cell assembly 10 having a terminal post 111 along the second direction Y. A busbar 21 is installed on the side of the isolation plate 22 opposite to the cell assembly 10 along the second direction Y. The isolation plate 22 has a through hole 221, through which the busbar 21 is electrically connected to the terminal post 111. The isolation plate 22 serves to isolate the busbar 21 from the portion of the cell 11 without the terminal post 111, and also facilitates the installation of the busbar 21.

[0054] In some embodiments, see further reference. Figure 3 The battery cell assembly 10 has a positive terminal block A and a negative terminal block B at at least one end along the second direction Y. The positive terminal block A and negative terminal block B are spaced apart along the third direction Z. The positive terminal block A includes a plurality of positive terminals 111a spaced apart along the same horizontal line in the first direction X, and the negative terminal block B includes a plurality of negative terminals 111b spaced apart along the same horizontal line in the first direction X. When each battery cell 11 includes four terminals 111, the battery cell assembly 10 has a positive terminal block A and a negative terminal block B at both ends along the second direction Y. The positive terminal blocks A and negative terminal blocks B at both ends of the battery cell assembly 10 can be directly opposite each other or staggered in the second direction Y; this is not limited here. When each battery cell 11 includes two terminals 111, the battery cell assembly 10 has a positive terminal block A and a negative terminal block B at one end along the second direction Y. (Continue reading...) Figure 2 Each busbar 21 includes a first conductive plate 214, a second conductive plate 215, and a connecting strip 216. The first conductive plate 214 is connected to the positive terminal 111a, the second conductive plate 215 is connected to the negative terminal 111b, and the connecting strip 216 connects the first conductive plate 214 and the second conductive plate 215. This configuration allows for a larger area of ​​the busbar 21, thereby improving its current carrying capacity and heat dissipation capacity.

[0055] Specifically, see Figure 3 and Figure 4The busbar 21 is shaped like an oblique I-shape, tilted relative to the first direction X and the third direction Z. The first conductive sheet 214 and the second conductive sheet 215 completely cover the terminal post 111 to which they are electrically connected, and the dimensions of the first conductive sheet 214 and the second conductive sheet 215 along the first direction X are equal to the dimensions of the battery cell 11 to which they are electrically connected along the first direction X. In this way, the area of ​​the busbar 21 can be further increased, and the current carrying capacity and heat dissipation capacity are further enhanced.

[0056] Furthermore, the dimension of bus 21 along the third direction Z is equal to the dimension of cell 11 along the third direction Z. In this way, the dimension of bus 21 in the third direction Z is maximized, thereby further improving the current carrying capacity and heat dissipation capacity of bus 21.

[0057] In some embodiments, each cell 11 includes four terminals 111. The cell assembly 10 has a positive terminal block A and a negative terminal block B at both ends along the second direction Y. The positive terminal blocks A at both ends of the cell assembly 10 are opposite each other in the second direction Y, and the negative terminal blocks B at both ends of the cell assembly 10 are also opposite each other in the second direction Y. In this case, the busbars 21 at both ends of the cell assembly 10 have the same tilt direction. In other embodiments, each cell 11 includes four terminals 111. The cell assembly 10 has a positive terminal block A and a negative terminal block B at both ends along the second direction Y. The positive terminal block A at one end and the negative terminal block B at the other end of the cell assembly 10 are opposite each other in the second direction Y. In this case, the busbars 21 at both ends of the cell assembly 10 have opposite tilt directions.

[0058] It should be noted that in both of the above specific embodiments, a circuit board 30 can be set on one side of the top of the battery cell assembly 10 to collect signals. This makes low-voltage acquisition simple and the manufacturing process of the circuit board 30 simple.

[0059] In other embodiments, see Figures 5-7 The battery cell assembly 10 has a first terminal block C and a second terminal block D at at least one end along the second direction Y. The first terminal block C and the second terminal block D are arranged at intervals along the third direction Z. Both the first terminal block C and the second terminal block D include positive terminal blocks 111a and negative terminal blocks 111b arranged alternately along the first direction X. Each busbar 21 is in the shape of a straight line, and both ends of each busbar 21 are connected to the adjacent positive terminal block 111a and negative terminal block 111b in the first terminal block C or the second terminal block D, respectively. This arrangement also ensures that the area of ​​the busbar 21 is sufficient, so that the busbar 21 has better current carrying capacity and heat dissipation capacity.

[0060] In some specific embodiments, each cell 11 includes four terminals 111, and the cell assembly 10 has a first terminal block C and a second terminal block D at both ends along the second direction Y. In this case, circuit boards 30 are provided on both sides of the top of the cell assembly 10 along the second direction Y, and the circuit boards 30 on both sides jointly collect signals, resulting in a simple low-voltage acquisition structure.

[0061] In some embodiments, see further reference. Figure 3 The busbar 21 includes a first connecting portion 211, a curved portion 213, and a second connecting portion 212 connected in sequence. The first connecting portion 211 and the second connecting portion 212 are respectively positioned opposite two adjacent battery cells 11 along the second direction Y, near the side of the battery cell 11. The first connecting portion 211 is electrically connected to the terminal post 111 of its opposite battery cell 11, and the second connecting portion 212 is also electrically connected to the terminal post 111 of its opposite battery cell 11. The curved portion 213 arches relative to the first connecting portion 211 and the second connecting portion 212 along the second direction Y, away from the battery cell 11, and is positioned opposite to the two adjacent battery cells 11. It should be noted that the first connecting portion 211 includes a portion of the aforementioned first conductive sheet 214 and connecting strip 216, and the second connecting portion 212 includes a portion of the aforementioned second conductive sheet 215 and connecting strip 216; the remaining portion of the connecting strip 216 forms the curved portion 213.

[0062] With the above configuration, the curved part 213 has a certain stretching allowance and is positioned relative to the two adjacent cells 11. When the cell 11 expands, the curved part 213 can deform preferentially, avoiding the influence of welding shear force.

[0063] Specifically, the position of the partition plate 22 corresponding to the curved part 213 is matched with the curved part 213 to facilitate the deformation of the curved part 213.

[0064] In some embodiments, the side of the busbar 21 away from the pole post 111 in the second direction Y is provided with an insulating layer to ensure the insulation effect between the busbars 21 and eliminate the influence of insufficient creepage distance between the busbars 21.

[0065] In some embodiments, see further reference. Figure 1 The battery module 100 also includes a first liquid cooling plate 40, which is disposed along the second direction Y on the side of the busbar 21 away from the terminal post 111 to dissipate heat from the busbar 21 and the terminal post 111. The first liquid cooling plate 40 can dissipate heat from the busbar 21 and the terminal post 111, preventing the busbar 21 and the terminal post 111 from overheating and ensuring the safe operation of the battery module 100.

[0066] Furthermore, the battery module 100 also includes a heat-conducting layer disposed between the first liquid cooling plate 40 and the busbar 21 to conduct heat between the first liquid cooling plate 40 and the busbar 21. In this way, the heat generated by the cell 11 is conducted to the busbar 21 through the terminal post 111, and then to the first liquid cooling plate 40 through the heat-conducting layer, so that the first liquid cooling plate 40 can fully dissipate heat from the busbar 21 and the terminal post 111.

[0067] In some embodiments, the battery module 100 further includes a bottom liquid cooling plate and a top liquid cooling plate. The bottom liquid cooling plate is disposed at the bottom of the cell assembly 10 along the third direction Z to exchange heat with the bottom of the cell assembly 10, and the top liquid cooling plate is disposed at the top of the cell assembly 10 along the third direction Z to exchange heat with the top of the cell assembly 10. In this way, the first liquid cooling plate 40, the top liquid cooling plate, and the bottom liquid cooling plate work together to dissipate heat from multiple sides of the cell assembly 10, ensuring the heat dissipation effect and facilitating the safe operation of the battery module 100.

[0068] Optionally, the aforementioned top liquid cooling plate can be installed at a location on the top of the battery cell assembly 10 where the circuit board 30 is not located, to ensure better heat dissipation for the battery cell assembly 10. In some specific embodiments, a circuit board 30 is located on one side of the top of the battery cell assembly 10 along the second direction Y, and the top liquid cooling plate is located on the other side of the top of the battery cell assembly 10 along the second direction Y. In other specific embodiments, when circuit boards 30 are located on both sides of the top of the battery cell assembly 10 along the second direction Y, the top liquid cooling plate is located between the two circuit boards 30.

[0069] In other embodiments, the battery module 100 may omit the bottom liquid cooling plate and only have a top liquid cooling plate, or omit the top liquid cooling plate and only include a bottom liquid cooling plate.

[0070] See Figure 8 and Figure 9 Another embodiment of this application also provides a battery pack 1000, including a housing 400 and the aforementioned battery module 100, wherein the battery module 100 is installed in the housing 400. Since the aforementioned battery module 100 has beneficial effects, the battery pack 1000 including the aforementioned battery module 100 has the same beneficial effects, which will not be described in detail here.

[0071] Furthermore, the battery pack 1000 also includes a second liquid cooling plate 200, which is located at the bottom end of the battery module 100 along the third direction Z, away from the circuit board 30, to cool the battery module 100 from the bottom. The battery pack 1000 also includes a third liquid cooling plate 300, which is located at the top end of the battery module 100 where the circuit board 30 is located along the third direction Z. The circuit board 30 is located between the cell assembly 10 and the third liquid cooling plate 300, and the third liquid cooling plate 300 can cool the battery module 100 from the top. In this way, the battery module 100, with the help of its own first liquid cooling plate 40 and the second and third liquid cooling plates 200 and 300 of the entire battery pack 1000, ensures a better heat dissipation effect on the cell assembly 10.

[0072] In other embodiments, the battery pack 1000 may only have the second liquid cooling plate 200 and omit the third liquid cooling plate 300, or the battery pack 1000 may only have the third liquid cooling plate 300 and omit the second liquid cooling plate 200.

[0073] It should also be noted that when the battery pack 1000 has a second liquid cooling plate 200 and a third liquid cooling plate 300, the battery module 100 can omit the bottom liquid cooling plate and the top liquid cooling plate. Alternatively, when the battery module 100 has a top liquid cooling plate and a bottom liquid cooling plate, the battery pack 1000 can omit the second liquid cooling plate 200 and the third liquid cooling plate 300.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery module, characterized by, include: The battery cell assembly (10) includes a plurality of battery cells (11) arranged along a first direction (X), each of the battery cells (11) having a terminal post (111) at at least one end along a second direction (Y), the first direction (X) being the length direction of the battery cell assembly (10), and the second direction (Y) being the width direction of the battery cell assembly (10). Busbar (21) is provided at the end of the cell assembly (10) having the terminal (111) along the second direction (Y); multiple busbars (21) are provided, and each busbar (21) is electrically connected to the terminal (111) of two cells (11) adjacent to the first direction (X); A circuit board (30) is disposed at one end of the battery cell assembly (10) along a third direction (Z), and the circuit board (30) extends along the first direction (X) and is disposed on one side close to the pole (111). The busbar (21) is connected to the circuit board (30), and the third direction (Z) is the height direction of the battery cell assembly (10). A first liquid cooling plate (40) is disposed on one side of the busbar (21) along the second direction (Y) to dissipate heat between the busbar (21) and the pole (111).

2. The battery module of claim 1, wherein, The busbar (21) includes a first connecting part (211), a curved part (213), and a second connecting part (212) connected in sequence. The first connecting part (211) and the second connecting part (212) are respectively opposite to two adjacent battery cells (11) on the side of the battery cell (11) along the second direction (Y). The curved portion (213) arches away from the battery cell (11) along the second direction (Y) relative to the first connecting portion (211) and the second connecting portion (212), and the curved portion (213) is positioned opposite to the two adjacent battery cells (11).

3. The battery module of claim 1, wherein, The circuit board (30) includes a main body (31) and connecting pieces (32). The main body (31) is disposed at one end of the battery cell assembly (10) along the third direction (Z), and each connecting piece (32) is arranged at intervals along the first direction (X). One end of each of the connecting pieces (32) is connected to the body (31), and the other end is bent along the third direction (Z) to connect to the busbar (21).

4. The battery module of claim 1, wherein, The battery cell assembly (10) has a positive terminal block (A) and a negative terminal block (B) at at least one end along the second direction (Y). The positive terminal block (A) and the negative terminal block (B) are arranged at intervals along the third direction (Z). The positive terminal block (A) includes a plurality of positive terminals (111a) arranged along the first direction (X) and on the same horizontal line. The negative terminal block (B) includes a plurality of negative terminals (111b) arranged along the first direction (X) and on the same horizontal line. Each of the busbars (21) includes a first conductive sheet (214), a second conductive sheet (215), and a connecting strip (216). The first conductive sheet (214) is connected to the positive terminal (111a), the second conductive sheet (215) is connected to the negative terminal (111b), and the connecting strip (216) connects the first conductive sheet (214) and the second conductive sheet (215).

5. The battery module of claim 4, wherein, The busbar (21) is shaped like an oblique I. The first conductive sheet (214) and the second conductive sheet (215) completely cover the terminal post (111) that is electrically connected to it, and the dimensions of the first conductive sheet (214) and the second conductive sheet (215) along the first direction (X) are equal to the dimensions of the battery cell (11) along the first direction (X). and / or The dimensions of the bus (21) along the third direction (Z) are equal to the dimensions of the cell (11) along the third direction (Z).

6. The battery module of claim 1, wherein, The battery cell assembly (10) has a first terminal block (C) and a second terminal block (D) at at least one end along the second direction (Y). The first terminal block (C) and the second terminal block (D) are arranged at intervals along the third direction (Z). Both the first terminal block (C) and the second terminal block (D) include a positive terminal block (111a) and a negative terminal block (111b) arranged alternately along the first direction (X). Each of the busbars (21) is in the shape of a straight line, and each of the two ends of the busbar (21) is connected to the adjacent positive terminal (111a) and negative terminal (111b) in the first terminal block (C) or the second terminal block (D).

7. The battery module of claim 1, wherein, The busbar (21) has an insulating layer on the side away from the pole (111) in the second direction (Y).

8. The battery module of claim 1, wherein, The battery module also includes a heat-conducting layer disposed between the first liquid cooling plate (40) and the busbar (21) to conduct heat between the first liquid cooling plate (40) and the busbar (21).

9. A battery pack, characterized in that, Includes the battery module as described in any one of claims 1-8.

10. The battery pack of claim 9, wherein, The battery pack also includes a second liquid cooling plate (200), which is located at the bottom end of the battery module away from the circuit board (30) along the third direction (Z); and / or The battery pack also includes a third liquid cooling plate (300), which is disposed at the top of the battery module along the third direction (Z) where the circuit board (30) is disposed, and the circuit board (30) is located between the cell group (10) and the third liquid cooling plate (300).

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