A battery module, a battery pack, and an electrical device.

Abstract

This application relates to a battery module, a battery pack, and an electrical device. The battery module includes: at least two cell groups spaced apart along a first direction, each cell group including multiple cells stacked along a second direction; each cell having terminals on both sides in the first direction; and multiple direct connection bars disposed between each pair of adjacent cell groups; in adjacent cell groups, each cell of one cell group is paired with each cell of the other cell group, and the terminals of each pair of cells are snapped together with the corresponding direct connection bars. Thus, compared to the prior art method of welding several copper or aluminum busbars to the terminals of the cells separately, this application uses multiple direct connection bars between adjacent cell groups and utilizes each direct connection bar to snap together with the terminals of a corresponding pair of cells, reducing the number of connection bars requiring welding, reducing welding points during assembly, and improving yield.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery module, battery pack, and power-consuming device. Background Technology

[0002] Batteries are widely used in electric vehicle battery pack systems due to their high energy density and low carbon footprint. A battery consists of multiple modules connected in series and parallel, forming a complete power supply system through mechanical structures and various battery management mechanisms. A battery module, in turn, is composed of various types of cells connected in series and parallel, along with an external frame, fixing devices, electrical connection devices, insulation devices, and common cooling devices, forming the entire battery module.

[0003] As the smallest unit constituting a battery module, the battery cell converts electrical energy into chemical energy and is the source of energy. A battery cell contains positive and negative terminals, a top cover, and an explosion-proof valve. When assembling individual cells in series and parallel to form a battery module, a large number of connectors are needed to weld them to the positive or negative terminals of each cell. This welding work is extensive, and poor welding of the connectors can significantly reduce the yield rate. Utility Model Content

[0004] Therefore, it is necessary to provide a battery module, battery pack, and power device that can reduce the number of connection bars, thereby reducing the number of solder joints and improving the yield rate, in order to address the above problems.

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

[0006] At least two cell groups are spaced apart along a first direction, each cell group comprising a plurality of cells stacked along a second direction; the first direction is perpendicular to the second direction; each cell has terminals on both sides of the first direction; and

[0007] Multiple direct-connection busbars are arranged between each pair of adjacent cell groups; in any pair of adjacent cell groups, each cell of one cell group is paired with each cell of the other cell group along the first direction, and the terminal of each pair of cells facing each other in the first direction is snapped into the corresponding direct-connection busbar.

[0008] In some embodiments, each of the direct-connection blocks has a snap-fit ​​portion on both sides opposite each other along the first direction, and each pair of battery cells has a snap-fit ​​engagement portion on each of the terminals facing each other that cooperates with the snap-fit ​​portion.

[0009] Each of the two snap-fit ​​portions of the direct-connection busbar is snap-fitted to the snap-fit ​​mating portion on the pole of the corresponding pair of battery cells, and the snap-fit ​​direction between the direct-connection busbar and the pole is parallel to the first direction.

[0010] In some embodiments, the snap-fit ​​portion is a snap-fit ​​groove, and the snap-fit ​​mating portion is a snap-fit ​​protrusion; or

[0011] The snap-fit ​​part is a snap-fit ​​protrusion, and the snap-fit ​​mating part is a snap-fit ​​groove.

[0012] In some embodiments, each of the battery cells has two terminals with opposite polarities on both sides of the first direction;

[0013] Two direct connection rows are provided between each pair of cells, arranged at intervals along a third direction. The third direction is perpendicular to both the first direction and the second direction. Each direct connection row is snapped into connection with two terminals of the same or opposite polarity.

[0014] In some embodiments, the battery module further includes a plurality of connection bars, each of the connection bars being arranged on the side of the cell assembly away from the direct connection bar along a first direction, and each of the connection bars being connected between the terminals of two adjacent cells along a second direction.

[0015] In some embodiments, each of the battery cells has two terminals with opposite polarities on both sides of the first direction, and each of the connection bars is connected between the terminals of two adjacent battery cells with the same or opposite polarities along the second direction.

[0016] In some embodiments, the battery module further includes two sets of positive output rows and negative output rows, both sets of positive output rows and negative output rows are arranged on the same side of one of the cell groups away from the direct connection row, and are arranged opposite to each other along the second direction;

[0017] In each group, the positive output bar and the negative output bar are respectively connected to the two terminals of one of the cells near the end of the cell group, and are used to connect to a high-voltage socket.

[0018] On the other hand, this application provides a battery pack, including a battery box and a battery module as described in any of the above embodiments, wherein the battery module is disposed within the battery box.

[0019] In some embodiments, the battery pack further includes two high-voltage sockets disposed on the battery box, with each set of positive and negative output terminals connected to one of the high-voltage sockets.

[0020] In another aspect, this application provides an electrical device including a battery pack as described in any of the above embodiments.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] The aforementioned battery module, battery pack, and electrical device have multiple direct connection bars arranged between two adjacent cell groups, and the terminals between each pair of cells in the two cell groups are connected by their respective direct connection bars, thereby realizing the electrical connection between the cells of the two adjacent cell groups.

[0023] Compared with the existing technology that uses several copper or aluminum busbars to weld to the corresponding battery cell terminals, this application uses multiple direct connection busbars between two adjacent battery cell groups and uses each direct connection busbar to be snapped to the terminals of the corresponding pair of battery cells. This greatly reduces the number of connection busbars that need to be welded, thereby greatly reducing the number of welding points during assembly and improving the yield rate. Attached Figure Description

[0024] Figure 1 This is an exploded view of the battery pack in one embodiment of this application;

[0025] Figure 2 for Figure 1 A schematic diagram of the battery module structure of the battery pack shown;

[0026] Figure 3 for Figure 2 A top view of the battery module shown;

[0027] Figure 4 for Figure 2 A schematic diagram of the battery module shown from another perspective;

[0028] Figure 5 for Figure 2 The side view of the battery module shown;

[0029] Figure 6 for Figure 2 The diagram shows the structure of the direct-connection array of the battery module.

[0030] Figure 7 for Figure 6 The diagram shows the structure of the straight-connected array from another perspective;

[0031] Figure 8 for Figure 6 The side view of the straight-connected row shown;

[0032] Figure 9 for Figure 8 The diagram shows a cross-sectional view of the straight-connected row along the AA direction. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application 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 application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0035] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In this application, unless otherwise expressly 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.

[0038] 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.

[0039] One embodiment of this application provides an electrical device that utilizes a battery pack as its power source. Specifically, the electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical device.

[0040] The specific structure of the battery pack is described below with reference to the accompanying drawings. Please refer to the attached diagram. Figure 1 As shown, the battery pack includes a battery box and battery modules 10. The battery box provides a receiving cavity for accommodating the battery modules 10, that is, each battery module 10 is housed within the receiving cavity of the battery box. The battery box can adopt various structures and shapes, such as a cuboid.

[0041] In one embodiment, the battery box includes a box body 21 and a box cover 23. The box cover 23 covers the box body 21, such that the box body 21 and the box cover 23 together enclose the aforementioned receiving cavity. The box body 21 includes a bottom plate 211 and two first side plates 213. The two first side plates 213 are respectively connected to both ends of the bottom plate 211 in a first predetermined direction and both extend towards the same side of the bottom plate 211, such that the bottom plate 211 and the two first side plates 213 combine to form a U-shaped box body 21. The box cover 23 includes a top plate 231 and two second side plates 233. The two second side plates 233 are respectively connected to both ends of the bottom plate 211 in a second predetermined direction perpendicular to the first predetermined direction and both extend towards the same side of the top plate 231, such that the top plate 231 and the two second side plates 233 combine to form a U-shaped box cover 23. It should be noted that the first predetermined direction may be parallel to the first direction described below, and the second predetermined direction may be parallel to the second direction described below. Of course, in other embodiments, the first preset direction may also be parallel to the second direction described below, and the second preset direction may be parallel to the first direction described below.

[0042] When the cover 23 is closed on the body 21, the top plate 231 of the cover 23 and the bottom plate 211 of the body 21 are arranged opposite each other. One first side plate 213, one second side plate 233, another first side plate 213, and another second side plate 233 are sequentially connected end to end between the bottom plate 211 and the top plate 231, so that the bottom plate 211 and the two first side plates 213 of the body 21, together with the top plate 231 and the two second side plates 233 of the cover 23, form the aforementioned receiving cavity. In this way, both the body 21 and the cover 23 are designed in a U-shape, which helps to simplify the structure and assembly process of the battery box.

[0043] Please see Figures 2 to 5 The battery module 10 includes a cell group 11 and a direct connection array a1. At least two cell groups 11 are configured, arranged sequentially at intervals along a first direction X1. Each cell group 11 includes a plurality of cells 110 stacked along a second direction X2, where the first direction X1 and the second direction X2 are perpendicular to each other. Each cell 110 has terminals b on both sides along the first direction X1. The direct connection array a1 is also multiple, arranged between each pair of adjacent cell groups 11. In any pair of adjacent cell groups 11: the cells 110 of one cell group 11 are paired with the cells 110 of the other cell group 11 along the first direction X1, and the terminals b of each pair of cells 110 facing each other along the first direction X1 are engaged with the corresponding direct connection array a1, thereby achieving electrical connection of the terminals b between the two adjacent cell groups 11.

[0044] Thus, multiple direct-connection bars a1 are arranged between two adjacent cell groups 11, and the terminals b between each pair of cells 110 in the two cell groups 11 are connected by their respective direct-connection bars a1, thereby realizing the electrical connection between the cells 110 of the two adjacent cell groups 11. The direct-connection bars a1 are metal components with good conductivity. The direct connection between the cells 110 of the two adjacent cell groups 11 can be achieved in a small space, improving operational convenience and space utilization.

[0045] Compared with the existing technology that uses several copper or aluminum busbars to weld to the corresponding battery cell terminals, this application uses multiple direct connection busbars a1 between two adjacent battery cell groups 11, and uses each direct connection busbar a1 to be snapped to the terminal b of the corresponding pair of battery cells 110, thereby greatly reducing the number of connection busbars that need to be welded, and thus greatly reducing the number of welding points during assembly, which is beneficial to improving the yield rate.

[0046] Specifically Figure 3 In the illustrated embodiment, there are two battery cell groups 11, namely a left battery cell group 11a and a right battery cell group 11b. Two cells 110 in the left battery cell group 11a and the right battery cell group 11b that are opposite each other in the left-right direction (i.e., the first direction X1) form a pair. Each pair of cells 110 includes a left cell and a right cell. The right terminal b of the left cell is connected to the left terminal b of the right cell via a direct connection a1, thereby achieving electrical connection between the two cells 110 in each pair.

[0047] Please see Figures 6 to 9 Specifically, in this embodiment, each straight-connected row a1 has a locking portion a11 on both opposite sides in the first direction X1. This locking portion a11 can be a locking groove. Each pair of battery cells 110 has a locking engagement portion (not shown) on its mutually facing terminals b. This locking engagement portion can be a locking protrusion. The locking protrusions on the terminals b of each pair of battery cells 110 are respectively inserted into the two locking grooves on a corresponding straight-connected row a1 and engaged. Thus, by providing two locking grooves on opposite sides of the straight-connected row a1, and by using these two locking grooves to engage with the locking protrusions on the terminals b of the corresponding pair of battery cells 110, the assembly process is greatly simplified, and the connection is stable and reliable, avoiding poor welding.

[0048] Furthermore, when the terminal b is inserted into the snap-fit ​​groove of the direct-connector a1 and snaps into the direct-connector a1, the end face of the terminal b and the snap-fit ​​groove of the direct-connector a1 match each other, and the snap-fit ​​is firm. The end face of the terminal b is in close contact with the bottom surface of the snap-fit ​​groove, ensuring that the contact area between the terminal b and the direct-connector a1 is large enough, reducing the contact resistance, and ensuring that the current carrying capacity between the terminal b and the direct-connector a1 meets the requirements.

[0049] Of course, in other embodiments, the snap-fit ​​part a11 can also be a snap-fit ​​protrusion, and the snap-fit ​​mating part can be a snap-fit ​​groove. As long as the direct connection a1 and the terminal b of the cell 110 can be snap-fitted and connected, it is not limited here.

[0050] In one embodiment, the snap-fit ​​direction of the direct connector a1 and the terminal b is parallel to the first direction X1, so that it can be directly installed with two terminals b at opposite ends of the first direction X1 at the same time. The two battery cells 110 can be plugged into the direct connector a1 from both ends along the first direction X1, without the need for installation one by one, thus improving production efficiency. At the same time, it is not necessary to extend from a third party to X3 between the two battery cell groups 11, thus saving installation space.

[0051] Specifically, in this embodiment, each cell 110 has two terminals b with opposite polarities on both sides in the first direction X1. Two direct connection blocks a1 are arranged at intervals along a third direction X3 between each pair of cells 110. This third direction X3 is perpendicular to both the first direction X1 and the second direction X2. Each direct connection block a1 is snapped into connection with two terminals b of the same polarity, thereby achieving parallel connection between a pair of cells 110. That is, in a pair of cells 110, the pair of terminals b opposite each other along the first direction X1 are two positive terminals, which are snapped together by a direct connection block a1; the other pair of terminals b opposite each other along the first direction X1 are two negative terminals, which are snapped together by another direct connection block a1, thus achieving parallel connection between a pair of cells 110.

[0052] It should be noted that the direct connection bus a1 is not limited to being connected to two terminals b with the same polarity. In other embodiments, the direct connection bus a1 can also be connected to two terminals b with different polarities. Specifically, two direct connection buses a1 are provided between each pair of cells 110, spaced apart along a third direction X3. Each direct connection bus a1 is connected to two terminals b with opposite polarities, thereby realizing the series or parallel connection of a pair of cells 110. That is, in a pair of cells 110, a pair of terminals b opposite to each other along the first direction X1 consists of a positive terminal and a negative terminal, which are connected by a direct connection bus a1; another pair of terminals b opposite to each other along the first direction X1 also consists of a positive terminal and a negative terminal, which are connected by another direct connection bus a1, thereby realizing the series connection of a pair of cells 110.

[0053] In embodiments of this application, the battery module 10 further includes multiple connection bars a2, each connection bar a2 being arranged on the side of the cell group 11 facing away from the direct connection bar a1 along the first direction X1. Each connection bar a2 is welded to the terminal post b of two adjacent cells 110 along the second direction X2, thereby realizing series or parallel connection between two adjacent cells 119 in the second direction X2. Thus, taking a battery module 10 including two cell groups 11 as an example, the terminal posts b of the two cell groups 11 facing each other are snapped into the direct connection bar a1, and the terminal posts b of the two cell groups 11 facing away from each other are welded to the connection bar a2, thereby realizing series or parallel connection between the individual cells 110 within each cell group 11 and between the two cell groups 11.

[0054] Specifically Figure 3 In the illustrated embodiment, there are two battery cell groups 11, namely a left battery cell group 11a and a right battery cell group 11b. Multiple connecting bars a2 are arranged on the left side of the left battery cell group 11a. Connecting bars a2 are welded between the terminals b of two batteries 110 connected in the second direction X2 in the left battery cell group 11a, thereby enabling series or parallel connection between the batteries 110 in the left battery cell group 11a. Multiple connecting bars a2 are also arranged on the right side of the right battery cell group 11b. Connecting bars a2 are welded between the terminals b of two batteries 110 connected in the second direction X2 in the right battery cell group 11b, thereby enabling series or parallel connection between the batteries 110 in the right battery cell group 11b.

[0055] Furthermore, each cell 110 has two terminals b with opposite polarities on both sides in the first direction X1. Each connecting bar a2 connects to the terminals b with the same polarity on two adjacent cells 110 along the second direction X2, thereby realizing the parallel connection of two adjacent cells 110 along the second direction X2. That is, in the same cell group 11, and on the side of the cell group 11 away from the other cell group 11: the terminals b on each pair of adjacent cells 110 are paired up, one pair of terminals b consists of two positive terminals connected by a connecting bar a2; the other pair of terminals b consists of two negative terminals connected by another connecting bar a2, thereby realizing the parallel connection of two adjacent cells 110 along the second direction X2.

[0056] It should be noted that the connecting strip a2 is not limited to welding with two terminals b of the same polarity. In other embodiments, the connecting strip a2 can also be welded with two terminals b of different polarities. Specifically, each connecting strip a2 is connected between two terminals b of opposite polarities, thereby realizing the series connection of two adjacent cells 110 along the second direction X2. That is, in the same cell group 11, and on the side of the cell group 11 away from the other cell group 11: the terminals b on each pair of adjacent cells 110 are paired up, one pair of terminals b is a positive terminal and a negative terminal, and is connected by a connecting strip a2; the other pair of terminals b is a positive terminal and a negative terminal, and is connected by another connecting strip a2, thereby realizing the series connection of two adjacent cells 110 along the second direction X2.

[0057] It should also be noted that each cell has two terminals with opposite polarities on both sides in the first direction X1, which makes the series and parallel connection methods between the cells in the battery module 10 more flexible and diverse, which helps to simplify the structure of the battery module 10 and improve the space utilization of the battery pack.

[0058] It should also be noted that the two first side plates 213 of the housing 21 are connected to the two sides of the bottom plate 211 in the second direction X2, so that the housing 21 has openings on both sides in the first direction X1. During the assembly process, when the battery module 10 is placed into the housing 21, the battery cell module 10 needs to have its two sides of the connecting strip a2 facing the openings on both sides of the housing 21 in the first direction X1. This allows for welding of each connecting strip a2 through the openings of the housing 21, ensuring a large operating space when welding each connecting strip a2, which helps to reduce the difficulty of welding operations and improve welding quality.

[0059] In embodiments of this application, the battery pack further includes two high-voltage sockets 30 disposed on the battery box. The battery module 10 also includes two positive output rows a4 and two negative output rows a5, with the two positive output rows a4 and the two negative output rows a5 forming a pair. Both sets of positive output rows a4 and negative output rows a5 are arranged on the same side of one of the cell groups 11 away from the direct connection row a1, and are arranged opposite each other along the second direction X2.

[0060] In one group, the positive output bus a4 and negative output bus a5 are respectively connected to the two terminals b (one positive terminal and one negative terminal) of a cell 110 at one end of the cell group 11 in the second direction X2, and are used to connect to a high-voltage socket 30. In the other group, the positive output bus a4 and negative output bus a5 are respectively connected to the two terminals b (one positive terminal and one negative terminal) of a cell 110 at the other end of the cell group 11 in the second direction X2, and are used to connect to another high-voltage socket 30. In this way, all the cells 110 in each cell group 11 are connected in series and parallel through the direct connection bus a1 and the connecting bus a2, and then connected to two high-voltage sockets 30 through two sets of positive output bus a4 and negative output bus a5. One of the high-voltage sockets 30 can be selectively used for power output or input, thus two high-voltage circuits can be drawn out, which can meet more functional requirements.

[0061] Specifically, one end of the positive output pin a4 is welded to the corresponding terminal b, and the other end of the positive output pin a4 is fixed to the corresponding high-voltage socket 30 by bolts. One end of the negative output pin a5 is welded to the corresponding terminal b, and the other end of the negative output pin a5 is fixed to the corresponding high-voltage socket 30 by bolts.

[0062] Specifically Figure 3 In the illustrated embodiment, the left-side terminal b of each cell 110 in the left cell group 11a is welded to the corresponding connecting bus a2, and the right-side terminal b of each cell 110 in the left cell group 11a is snapped into the corresponding direct connection bus a1. In the right cell group 11b, the right-side terminal b of the two cells 110 at both ends in the second direction X2 is not welded to the connecting bus a2, but is instead welded to the positive output bus a4 and the negative output bus a5; the right-side terminal b of the remaining cells b in the right cell group 11b is welded to the corresponding connecting bus a2. The left-side terminal b of each cell 110 in the right cell group 11b is snapped into the corresponding direct connection bus a1.

[0063] 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.

[0064] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery module, characterized by, include: At least two cell groups (11) are spaced apart along a first direction (X1), each cell group (11) comprising a plurality of cells (110) stacked along a second direction (X2); the first direction (X1) is perpendicular to the second direction (X2); each cell (110) has terminals (b) on both sides in the first direction (X1); and Multiple direct-connection rows (a1) are arranged between each pair of adjacent cell groups (11); in any pair of adjacent cell groups (11), each cell (110) of one cell group (11) is paired with each cell (110) of the other cell group (11) along the first direction (X1), and the terminal (b) facing each other in the first direction (X1) is snapped into the corresponding direct-connection row (a1).

2. The battery module of claim 1, wherein, Each of the direct-connection blocks (a1) has a snap-fit ​​portion (a11) on both sides opposite each other along the first direction (X1), and each pair of cells (110) has a snap-fit ​​engagement portion on each pole (b) facing each other, which is used in conjunction with the snap-fit ​​portion (a11). Each of the two snap-fit ​​portions (a11) of the direct-connection busbar (a1) is snap-fitted to the snap-fit ​​mating portion on the pole post (b) of the corresponding pair of battery cells (110), and the snap-fit ​​direction of the direct-connection busbar (a1) and the pole post (b) is parallel to the first direction (X1).

3. The battery module of claim 2, wherein, The snap-fit ​​part (a11) is a snap-fit ​​groove, and the snap-fit ​​mating part is a snap-fit ​​protrusion; or The snap-fit ​​part (a11) is a snap-fit ​​protrusion, and the snap-fit ​​mating part is a snap-fit ​​groove.

4. The battery module of claim 1, wherein, Each of the battery cells (110) has two terminals (b) with opposite polarities on both sides in the first direction (X1); Two direct connection rows (a1) are arranged at intervals along a third direction (X3) between each pair of cells (110). The third direction (X3) is perpendicular to both the first direction (X1) and the second direction (X2). Each direct connection row (a1) is snapped into connection with two pole posts (b) of the same or opposite polarity.

5. The battery module of claim 1, wherein, The battery module (10) further includes a plurality of connection rows (a2), each of the connection rows (a2) being arranged on the side of the cell group (11) away from the direct connection row (a1) along the first direction (X1), and each of the connection rows (a2) being connected between the terminals (b) of two adjacent cells (110) along the second direction (X2).

6. The battery module of claim 5, wherein, Each of the battery cells (110) has two terminals (b) with opposite polarities on both sides in the first direction (X1), and each of the connecting bars (a2) is connected between the terminals (b) with the same or opposite polarities of two adjacent battery cells (110) along the second direction (X2).

7. The battery module of claim 5, wherein, The battery module (10) further includes two sets of positive output rows (a4) and negative output rows (a5). The two sets of positive output rows (a4) and negative output rows (a5) are arranged on the same side of one of the cell groups (11) away from the direct connection row (a1) and are arranged opposite to each other along the second direction (X2). In each group, the positive output bar (a4) and the negative output bar (a5) are respectively connected to the two terminals (b) of one of the cells (110) near the end in the cell group (11) and are used to connect to the high voltage socket (30).

8. A battery pack, characterized by, It includes a battery box and a battery module (10) as described in any one of claims 1 to 7, wherein the battery module (10) is disposed within the battery box.

9. The battery pack of claim 8, wherein, The battery pack also includes two high-voltage sockets (30) disposed on the battery box, and each set of the positive output row (a4) and the negative output row (a5) is connected to one of the high-voltage sockets (30).

10. An electrical device, characterized by Includes the battery pack as described in any one of claims 8 or 9.

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