Battery module, battery pack and electric device

Abstract

The utility model relates to a battery module, a battery pack and an electric device. The battery module comprises a plurality of single batteries, each single battery is provided with a pole, the pole is provided with a first binding surface, a first matching surface and a clamping part, and the clamping part is located on the first matching surface; and each busbar is provided with a clamping matching part, and each busbar is in contact with the first binding surface in a binding manner through the clamping matching part and is clamped with the clamping part on the corresponding pole. The terminal post and the busbar are connected in a clamping manner, so that on one hand, the problem of long equipment adjustment time during production line remodeling caused by different welding parameters is avoided, and the equipment adjustment time during production line remodeling is greatly shortened; on the other hand, the requirement on the surface cleanliness of the pole and the busbar is greatly reduced, so that the manual cleaning cost is greatly reduced; and on the other hand, scrapping of the battery monomers and even the battery module caused by poor welding such as pseudo soldering and explosion points during welding is avoided, and the loss cost is greatly reduced.

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] Lithium-ion batteries possess advantages such as high energy density, long cycle life, high rate performance, good safety, and environmental friendliness, making them an important energy source for modern electronic products and electric vehicles. To increase output voltage or current, batteries typically consist of multiple individual cells connected in series, parallel, or a combination thereof, all integrated within a battery casing. The individual cells are electrically connected via busbars; currently, the busbars are welded to the terminals of the individual cells to achieve this connection.

[0003] However, the welding method for connecting the busbar and the battery cell terminals has the following drawbacks: 1. Different specifications of battery cells and busbars have different welding parameters, resulting in long equipment adjustment time when changing production lines and reducing production efficiency; 2. Welding requires a high degree of cleanliness of the surface of the busbar and battery cell terminals, which requires manual cleaning, resulting in a significant increase in labor costs; 3. Welding defects such as incomplete welds and bursts are prone to occur, causing the entire battery cell or even the battery module to be scrapped, greatly increasing the cost of loss. Utility Model Content

[0004] Therefore, it is necessary to provide a battery module, battery pack, and power device that can improve production efficiency, reduce labor costs, and reduce loss costs in order to address the above problems.

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

[0006] Multiple battery cells, each battery cell having an electrode post, the electrode post having a first mating surface, a first contact surface, and a snap-fit ​​portion located on the same side of the electrode post, the snap-fit ​​portion being located on the first contact surface; and

[0007] Multiple busbars, each busbar having a snap-fit ​​part, each busbar being in contact with the first mating surface, and being snapped into the snap-fit ​​part on the corresponding pole through the snap-fit ​​part.

[0008] In some embodiments, one of the snap-fit ​​portion and the snap-fit ​​mating portion is a snap-fit ​​groove, and the other of the snap-fit ​​portion and the snap-fit ​​mating portion is a protrusion, the protrusion being snap-fitted into the snap-fit ​​groove.

[0009] In some embodiments, the pole has a plurality of the snap-fit ​​portions, and the busbar has snap-fit ​​mating portions that snap into the plurality of snap-fit ​​portions one by one, and at least two of the snap-fit ​​grooves have different depths.

[0010] In some embodiments, the battery cell has a protruding region and two recessed regions on one side surface in the second direction. The recessed regions are recessed into the battery cell relative to the protruding regions. The recessed regions are provided with the terminal posts, and the busbars that are engaged with the terminal posts have a height in the second direction that is less than or equal to the height of the protruding regions. The two recessed regions are located at both ends of the battery cell in the third direction, and the protruding region is located between the two recessed regions. The second direction and the third direction are perpendicular to each other.

[0011] In some embodiments, there are two first mating surfaces, with the first contact surface located between the two first mating surfaces, and the snap-fit ​​portion is provided on both first mating surfaces; the first contact surface protrudes from the two first mating surfaces.

[0012] In some embodiments, each busbar has a second contact surface on the side where the snap-fit ​​part is provided, and the second contact surface is in contact with the first contact surface.

[0013] Each of the busbars also has an exposed surface opposite to the second mating surface and a through hole penetrating the exposed surface and the second mating surface.

[0014] In some embodiments, a plurality of battery cells are stacked along a first direction, and each battery cell has a terminal post on one side in a second direction; the battery module further includes a circuit board disposed on at least one side of each battery cell in a third direction, and each busbar is connected to the circuit board; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0015] In some embodiments, each busbar includes a first segment and a second segment connected to the first segment, the first segment being connected to the circuit board, and the snap-fit ​​portion being located on the second segment;

[0016] The second segment is bent relative to the first segment to the side of the battery cell with the terminal post, and is engaged with the locking part on the terminal post through the locking engagement part.

[0017] 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 inside the battery box.

[0018] On the other hand, this application provides an electrical device including a battery pack as described in any of the above embodiments.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] The aforementioned battery module, battery pack, and electrical device achieve mechanical and electrical connections between the terminals of each battery cell and the corresponding busbar through snap-fit ​​parts and snap-fit ​​mating parts, thereby enabling the series, parallel, or mixed connection of the battery cells in the battery module. Compared with the welding method used in the prior art to connect the terminals and busbars, the snap-fit ​​connection method used in this application avoids the problem of long equipment adjustment time during production line changeovers due to different welding parameters, greatly shortening the equipment adjustment time during production line changeovers; it also greatly reduces the requirements for the cleanliness of the terminals and busbar surfaces, thereby significantly reducing manual cleaning costs; furthermore, it avoids the scrapping of battery cells or even battery modules due to poor welding such as incomplete welds or bursts during welding, greatly reducing loss costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the battery module structure in one embodiment of this application;

[0022] Figure 2 for Figure 1 A top view of the battery module shown;

[0023] Figure 3 for Figure 1 The diagram shows the exploded structure of the battery module.

[0024] Figure 4 for Figure 1 The image shows a magnified view of the battery module at point A.

[0025] Figure 5 for Figure 4 A magnified view of part A of the battery module shown (the junction box is separated from the terminal block);

[0026] Figure 6 for Figure 1 The diagram shown is a structural schematic of the busbar.

[0027] Figure 7 for Figure 1 The diagram shows the structure of the battery module's connection board, circuit board, and busbar. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] One embodiment of this application provides an electrical device, a battery pack, and a battery module. The electrical device utilizes the battery pack as its power source. The electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or 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.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be a carousel, a drop tower, etc.

[0035] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc. For new energy vehicles, the aforementioned battery can serve as a driving power source, thereby replacing fossil fuels to provide propulsion. This application does not impose any special restrictions on the aforementioned electrical devices.

[0036] The battery pack specifically includes a battery box and a battery management system (BMS) housed within it, along with multiple battery modules. The battery box provides space for the battery modules and the BMS; it can have various structures and shapes, such as a cuboid. Each battery module comprises multiple individual battery cells, which can be electrically connected in series, parallel, or a combination of both. Individual battery cells can first be connected to the BMS to form a battery module, and then multiple battery modules can be electrically connected in series, parallel, or a combination of both to form the battery pack. The BMS controls and monitors the operating status of each battery module.

[0037] The aforementioned battery cell can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and its external outline can be cylindrical, flat, cuboid, or other shapes, but is not limited to these. Specifically, in this embodiment, the aforementioned battery cell is a lithium-ion square battery.

[0038] The specific structure of the battery module is described below with reference to the accompanying drawings. Please refer to the attached diagram. Figures 1 to 4 As shown, the battery module includes multiple battery cells 10 and multiple busbars 20. Each battery cell 10 has a terminal post 11, which has a snap-fit ​​portion 112 (see...). Figure 4 Each busbar 20 has a snap-fit ​​part 21 (see...) Figure 4 Each busbar 20 is engaged with the corresponding terminal post 112 via the snap-fit ​​part 21, thereby realizing the mechanical and electrical connection between the busbar 20 and the terminal post 11 of the corresponding battery cell 10.

[0039] Thus, the terminals 11 of each battery cell 10 in the battery module are mechanically and electrically connected to the corresponding busbars 20 through the snap-fit ​​parts 112 and 21, thereby enabling the series, parallel, or mixed connection of the battery cells 10 in the battery module. Compared with the welding method used in the prior art to connect the terminals 11 and busbars 20, the snap-fit ​​method used in this application avoids the problem of long equipment adjustment time during production line changeovers due to different welding parameters, greatly shortening the equipment adjustment time during production line changeovers; it also greatly reduces the requirements for the surface cleanliness of the terminals 11 and busbars 20, thereby greatly reducing manual cleaning costs; and it also avoids the scrapping of battery cells 10 or even the battery module due to poor welding such as incomplete welds or bursts during welding, greatly reducing loss costs.

[0040] It should also be noted that the terminal 11 and the busbar 20 in this application are connected by a snap-fit ​​method, so the terminal 11 and the busbar 20 are detachable. When maintaining the battery module, the terminal 11 and the busbar 20 can be disassembled, which greatly reduces the maintenance difficulty and cost.

[0041] In a specific embodiment, the aforementioned snap-fit ​​portion 112 can be a snap-fit ​​groove, and the snap-fit ​​mating portion 21 can be a protrusion. The protrusion can snap into the snap-fit ​​groove, that is, the connection between the terminal post 11 and the busbar 20 is achieved by the snap-fit ​​mating of the snap-fit ​​groove and the protrusion, making assembly convenient and quick. Of course, in other embodiments, the snap-fit ​​portion 112 can also be a protrusion, and the snap-fit ​​mating portion 21 can be a snap-fit ​​groove, as long as the snap-fit ​​connection between the terminal post 11 and the busbar 20 can be achieved, and there is no limitation here.

[0042] In a specific embodiment, the pole post 11 has multiple (i.e., two or more) snap-fit ​​parts 112, and the busbar 20 has multiple snap-fit ​​mating parts 21 that snap-fit ​​one-to-one with the multiple snap-fit ​​parts 112.

[0043] When each snap-fit ​​portion 112 on the pole post 11 is a snap-fit ​​groove, each snap-fit ​​mating portion 21 on the busbar 20 is a protrusion. Moreover, at least two snap-fit ​​grooves on the pole post 11 have different depths. Thus, multiple snap-fit ​​grooves of different depths are used to snap-fit ​​with the corresponding protrusions, which greatly improves the connection between the pole post 11 and the busbar 20 and prevents the busbar 20 from falling off the pole post 11.

[0044] Similarly, when each snap-fit ​​portion 112 on the pole post 11 is a protrusion, each snap-fit ​​mating portion 21 on the busbar 20 is a snap-fit ​​groove. Moreover, at least two snap-fit ​​grooves on the busbar 20 have different depths. Thus, multiple snap-fit ​​grooves of different depths are used to snap-fit ​​with the corresponding protrusions, which greatly improves the connection between the pole post 11 and the busbar 20 and prevents the busbar 20 from falling off the pole post 11.

[0045] Please see Figures 4 to 6 Specifically, in this embodiment, the side of the terminal post 11 with the snap-fit ​​portion 112 also has a first contact surface a1 and a first mating surface a2, with the snap-fit ​​portion 112 disposed on the first mating surface a2. The side of the busbar 20 with the snap-fit ​​mating portion 21 also has a second contact surface a3 and a second mating surface a4, with the snap-fit ​​mating portion 21 disposed on the second mating surface a4. When the snap-fit ​​portion 112 on the terminal post 11 engages with the snap-fit ​​mating portion 21 on the busbar 20, the first contact surface a1 of the terminal post 11 and the second contact surface a3 of the busbar 20 are in close contact with each other, thereby ensuring that the contact area between the terminal post 11 and the busbar 20 is large enough to meet the overcurrent requirements.

[0046] Optionally, each pole post 11 has two first mating surfaces a2, with a first contact surface a1 located between the two first mating surfaces a2. Each of the two first mating surfaces a2 is provided with a snap-fit ​​portion 112. Correspondingly, each busbar 20 has two second mating surfaces a4, with a second contact surface a3 located between the two second mating surfaces a4. Each of the two second mating surfaces a4 is provided with a snap-fit ​​portion 21. The snap-fit ​​portion 112 on one of the first mating surfaces a2 of the pole post 11 engages with the snap-fit ​​portion 21 on one of the second mating surfaces a4 of the busbar 20, and the snap-fit ​​portion 112 on the other first mating surface a2 of the pole post 11 engages with the snap-fit ​​portion 21 on the other second mating surface a4 of the busbar 20. This securely engages the pole post 11 with the busbar 20, and ensures that the first contact surface a1 and the second contact surface a3 are tightly fitted together, significantly reducing the risk of poor contact between the pole post 11 and the busbar 20.

[0047] Furthermore, the first contact surface a1 on the pole post 11 protrudes from the two first mating surfaces a2, so that the first contact surface a1 on the pole post 11 and the second contact surface a3 on the busbar 20 can fit tightly together, further reducing the risk of poor contact between the pole post 11 and the busbar 20.

[0048] Furthermore, multiple snap-fit ​​parts 112 are provided on both first mating surfaces a2 of the pole post 11, and multiple snap-fit ​​mating parts 21 are provided on both second mating surfaces a4 of the busbar 20, further improving the snap-fit ​​firmness between the pole post 11 and the busbar 20 and preventing the pole post 11 and the busbar 20 from becoming loose.

[0049] Specifically Figure 5 and Figure 6 In the described embodiment, each of the two first mating surfaces a2 of the pole post 11 is provided with three snap-fit ​​portions 112, meaning that the pole post 11 has a total of six snap-fit ​​portions 112. Each of the two second mating surfaces a4 of the busbar 20 is provided with three snap-fit ​​portions 112, meaning that the busbar 20 has a total of six snap-fit ​​mating portions 21. These six snap-fit ​​mating portions 21 and six snap-fit ​​portions 112 are engaged one-to-one to achieve the snap-fit ​​connection between the pole post 11 and the busbar 20.

[0050] Furthermore, each busbar 20 also has an exposed surface a6 and a through hole a5. The exposed surface a6 is opposite to the second mating surface a3, and the through hole a5 penetrates both the second mating surface a3 and the exposed surface a6 of the busbar 20. The through hole a5 serves two purposes: firstly, when the first mating surface a1 of the pole post 11 and the second mating surface a3 of the busbar 20 are mated together, the through hole a5 allows for air venting, ensuring a tight fit between the first mating surface a1 and the second mating surface a3, and the degree of mating between the first mating surface a1 of the pole post 11 and the second mating surface a3 of the busbar 20 can be observed through the through hole a5; secondly, when the snap-fit ​​portion 112 on the pole post 11 and the snap-fit ​​mating portion 21 on the busbar 20 fail to engage, the through hole a5 can be used to weld the pole post 11 and the busbar 20, and the welding status can be observed through the through hole a5.

[0051] Please see again Figures 1 to 3In the embodiments of this application, multiple battery cells 10 of the battery module are stacked along a first direction X1, and each battery cell 10 has the aforementioned terminal post 11 on one side in a second direction X2. The battery module also includes a circuit board 30 disposed on at least one side of each battery cell 10 in a third direction X3. One end of each bus 20 is connected to the circuit board 30, and the other end is provided with the aforementioned snap-fit ​​part 21, and the connection with the corresponding terminal post 11 is achieved by snap-fitting the snap-fit ​​part 21 and the snap-fit ​​part 112. Wherein, the first direction X1 is the thickness direction of the battery cell 10, the second direction X2 is the height direction of the battery cell 10, and the third direction X3 is the length direction of the battery cell 10, and the first direction X1, the second direction X2, and the third direction X3 are all perpendicular to each other.

[0052] In this way, each busbar 20 is connected to the circuit board 30, enabling the circuit board 30 to collect information such as temperature, current, or voltage of each busbar 20 and transmit the collected information to the battery management system. It should be noted that the circuit board 30 can be a flexible circuit board, or other types of circuit boards can be used, which are not limited here.

[0053] Furthermore, each battery cell 10 has a protruding region b1 and a recessed region b2 on one side surface in the second direction X2. The recessed region b2 is recessed into the battery cell 10 relative to the protruding region b1, meaning that the height of the recessed region b2 in the second direction X2 is lower than that of the protruding region b1. The terminal post 11 is located in the recessed region b2, so that the height of the busbar 20, which is snapped onto the terminal post 11, in the second direction X2 will not be higher than that of the protruding region b1. On the one hand, this helps to save space on the side of the battery module where the terminal post 11 is located, reducing the height of the battery module; on the other hand, it avoids the increased difficulty in installing the cooling plate due to the protrusion of the terminal post 11 and the busbar 20, making it easier to install the cooling plate on the side of the battery module where the terminal post 11 is located.

[0054] Furthermore, each battery cell 10 has two terminals 11 on one side in the second direction X2. The two terminals 11 have opposite polarities, i.e., one is the positive terminal and the other is the negative terminal. Each battery cell 10 has two recessed regions b2 on one side in the second direction X2. The two recessed regions b2 are located at both ends of the battery cell 10 in the third direction X3, and a protruding region b1 is located between the two recessed regions b2. The two terminals 11 are respectively located in the two recessed regions b2.

[0055] The battery module has a first side c1 and a second side c2 on the third direction X3. The recessed area b2 adjacent to the first side c1 of each battery cell 10 is the first recessed area, and the recessed area b2 adjacent to the second side c2 of each battery cell 10 is the second recessed area. Two circuit boards 30 are also provided, respectively disposed on the first side c1 and the second side c2 of the battery module. Busbars 20, which are fixedly engaged with the terminals 11 located in the first recessed areas of each battery cell 10, are connected to the circuit board 30 on the first side c1. Similarly, busbars 20, which are fixedly engaged with the terminals 11 located in the second recessed areas of each battery cell 10, are connected to the circuit board 30 on the second side c2.

[0056] Please see also Figure 7 Specifically, in each embodiment, each busbar 20 includes a first segment 23 and a second segment 25 connected to the first segment 23. The first segment 23 of the busbar 20 is connected to the circuit board 30, and a snap-fit ​​part 21 is located on the second segment 25 of the busbar 20. The second segment 25 of the busbar 20 is bent relative to the first segment 23 to the side of the battery cell 10 with the terminal post 11, and is snapped and fixed to the terminal post 11 by the snap-fit ​​part 21 and the snap-fit ​​part 112 on the terminal post 11.

[0057] Furthermore, the battery module also includes multiple electrical connectors 60, each electrical connector 60 being connected between the first segments 23 of two adjacent busbars 20, and each electrical connector 60 being connected to the circuit board 30, thereby enabling the first segments 23 of two adjacent busbars 20 to be electrically connected to the circuit board 30 through the electrical connectors 60 between them.

[0058] In a specific embodiment, the battery module further includes two end plates 40 and two connecting plates 50. The two end plates 40 are spaced apart along a first direction X1, and the two connecting plates 50 are spaced apart along a third direction X3. Each connecting plate 50 is detachably connected to the two end plates 40 at both ends along the first direction X1. Each battery cell 10 is located within the space enclosed by the two end plates 40 and the two connecting plates 50, thereby using the two end plates 40 to press and fix each battery cell 10 along the first direction X1, preventing the battery cells 10 from becoming loose. The two circuit boards 30 are respectively mounted on the two connecting plates 50.

[0059] It should be noted that the end plate 40 and the connecting plate 50 are detachable, which facilitates the disassembly and assembly of the battery module during maintenance.

[0060] Optionally, each connecting plate 50 is fixedly connected to the two end plates 40 at both ends in the first direction X1 by bolts.

[0061] Optionally, the circuit board 30 can be fixed to the connecting plate 50 by thermal riveting, and the first section 23 of the bus 20 and the electrical connector 60 can also be fixed to the connecting plate 50 by thermal riveting.

[0062] 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.

[0063] 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: Multiple battery cells (10), each battery cell (10) having a terminal post (11), the terminal post (11) having a first contact surface (a1), a first mating surface (a2), and a snap-fit ​​portion (112) located on the same side of the terminal post (11), the snap-fit ​​portion (112) being located on the first mating surface (a2); and Multiple busbars (20), each of the busbars (20) has a snap-fit ​​part (21), each of the busbars (20) is in contact with the first mating surface (a1), and is snapped with the snap-fit ​​part (112) on the corresponding pole (11) through the snap-fit ​​part (21).

2. The battery module of claim 1, wherein, One of the snap-fit ​​portion (112) and the snap-fit ​​mating portion (21) is a snap-fit ​​groove, and the other of the snap-fit ​​portion (112) and the snap-fit ​​mating portion (21) is a protrusion, which snaps into the snap-fit ​​groove.

3. The battery module of claim 2, wherein, The pole post (11) has a plurality of the snap-fit ​​portions (112), and the busbar (20) has snap-fit ​​mating portions (21) that snap-fit ​​one-to-one with the plurality of snap-fit ​​portions (112), and at least two of the snap-fit ​​grooves have different depths.

4. The battery module according to any one of claims 1 to 3, characterized in that The battery cell (10) has a protruding region (b1) and two recessed regions (b2) on one side surface in the second direction (X2). The recessed regions (b2) are recessed into the battery cell (10) relative to the protruding regions (b1). The terminal post (11) is provided in the recessed region (b2), and the busbar (20) that is engaged with the terminal post (11) has a height in the second direction (X2) that is less than or equal to that of the protruding region (b1). The two recessed regions (b2) are located at both ends of the battery cell (10) in the third direction (X3), and the protruding region (b1) is located between the two recessed regions (b2). The second direction (X2) and the third direction (X3) are perpendicular to each other.

5. The battery module of claim 1, wherein, The first mating surface (a2) is provided in two parts, and the first contact surface (a1) is located between the two first mating surfaces (a2). The two first mating surfaces (a2) are provided with the snap-fit ​​portion (112); the first contact surface (a1) protrudes from the two first mating surfaces (a2).

6. The battery module of claim 4, wherein, Each of the busbars (20) has a second contact surface (a3) ​​on one side where the snap-fit ​​part (21) is provided, and the second contact surface (a3) ​​and the first contact surface (a1) are in contact with each other. Each of the busbars (20) also has an exposed surface (a6) opposite to the second mating surface (a3) ​​and a through hole (a5) penetrating the exposed surface (a6) and the second mating surface (a3).

7. The battery module of claim 1, wherein, Multiple battery cells (10) are stacked along a first direction (X1), and each battery cell (10) has a terminal post (11) on one side in a second direction (X2); the battery module also includes a circuit board (30) arranged on at least one side of each battery cell (10) in a third direction (X3), and each busbar (20) is connected to the circuit board (30); wherein the first direction (X1), the second direction (X2) and the third direction (X3) are perpendicular to each other.

8. The battery module of claim 7, wherein, Each of the busbars (20) includes a first segment (23) and a second segment (25) connected to the first segment (23), the first segment (23) being connected to the circuit board (30), and the snap-fit ​​part (21) being located on the second segment (25); The second segment (25) is bent relative to the first segment (23) to the side of the battery cell (10) having the pole (11), and is engaged with the pole (112) on the pole (11) by the snap-fit ​​part (21).

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

10. An electrical device, characterized by Includes the battery pack as described in claim 9.

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