Battery pack and electric device

Abstract

The application discloses a battery pack and an electric device, the battery pack has a first direction, comprising a box body and a plurality of battery monomers, the plurality of battery monomers are arranged in the box body and are arranged along the first direction; the battery monomer comprises a shell, a first terminal and a second terminal, the first terminal is connected with the shell, at least part of the first terminal protrudes from one side of the shell along the first direction; the second terminal is arranged opposite to the first terminal along the first direction, the second terminal is connected with the shell and at least part of the second terminal protrudes from the side of the shell away from the first terminal, the second terminal has a containing groove; the adjacent first terminal and the second terminal of two adjacent battery monomers along the first direction are connected, and at least part of the first terminal is inserted into the containing groove. The first terminal and the second terminal adjacent to the two adjacent battery monomers of the application directly butt joint, the series connection of the battery monomers is realized, the weight of the battery pack is effectively reduced, the internal space of the battery pack is saved, and the volume energy density of the battery pack is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] As a crucial energy storage component, the battery pack contains multiple battery cells stacked together. These cells are connected in series and parallel to achieve the desired charging and discharging power. However, connecting adjacent battery cells in series and parallel requires connecting them to their corresponding electrode terminals via busbars, which occupies internal space and increases the weight of the battery pack, hindering the improvement of its volumetric energy density. Utility Model Content

[0003] The purpose of this utility model is to provide a battery pack that addresses the problem that existing methods of connecting adjacent battery cells via busbars occupy internal space and increase the weight of the battery pack, which is detrimental to improving the volumetric energy density of the battery pack. Another purpose of this application is to provide an electrical device.

[0004] Technical solution: A battery pack according to an embodiment of this application has a first orientation; including:

[0005] The box-shaped enclosure has a receiving cavity;

[0006] Multiple battery cells are disposed in the receiving cavity and arranged along the first direction; the battery cells include:

[0007] case;

[0008] A first terminal is connected to the housing, and at least a portion of the first terminal protrudes from the housing on one side along the first direction;

[0009] The second terminal is disposed opposite to the first terminal along the first direction. The second terminal is connected to the housing. At least a portion of the second terminal protrudes from the housing on the side away from the first terminal along the first direction. The second terminal has a receiving groove. The adjacent first terminals and second terminals of two adjacent battery cells along the first direction are connected. At least a portion of the first terminal is inserted into the receiving groove.

[0010] In some embodiments, the receiving groove is disposed on the side of the second terminal away from the housing along the first direction; the first terminal connected to the second terminal is inserted into the receiving groove along the first direction.

[0011] In some embodiments, the battery cell further includes an elastic element disposed within the receiving groove and electrically connected to the second terminal, wherein the elastic element elastically abuts against and electrically connects to the first terminal located within the receiving groove.

[0012] In some embodiments, the elastic element is any one of a conductive spring, a conductive sheet, or a conductive adhesive layer.

[0013] In some embodiments,

[0014] The first terminal includes:

[0015] A first body is connected to the housing and protrudes from the housing on one side along the first direction;

[0016] A first limiting part is disposed at one end of the first body away from the shell along the first direction, and is disposed around the outer periphery of the first body. The first limiting part is spaced apart from the shell along the first direction.

[0017] The second terminal includes:

[0018] The second body is connected to the housing and protrudes from the side of the housing away from the first limiting part;

[0019] Multiple clamping portions are disposed on the side of the second body away from the housing along the first direction and spaced apart along the circumference of the second body; the multiple clamping portions are connected to the second body to form the receiving groove; the clamping portions are configured to be deformable along the radial direction of the second terminal, the clamping portions clamp the outer peripheral side of the first terminal located in the receiving groove, and the clamping portions and the first limiting portion limit each other along the first direction.

[0020] In some embodiments, the clamping portion includes:

[0021] An elastic body is disposed on the side of the second body away from the housing along the first direction;

[0022] The second limiting part is connected to the side of the elastic body away from the second body along the first direction, and the orthographic projection of the second limiting part on the second body along the first direction is located in the receiving groove. The second limiting part abuts against the first limiting part of the first terminal located in the receiving groove along the first direction.

[0023] In some embodiments,

[0024] The first terminal includes:

[0025] The third body is connected to the housing and protrudes from the housing on one side along the first direction;

[0026] The third limiting part is disposed on the outer peripheral side of the third body and is connected to the third body;

[0027] The second terminal has a first limiting groove, which penetrates the inner wall of the receiving groove and communicates with the receiving groove; the third body of the first terminal connected to the second terminal passes through the receiving groove, and the third limiting part passes through the first limiting groove.

[0028] In some embodiments,

[0029] The third limiting part is spaced apart from the housing along the first direction;

[0030] The second terminal also has a second limiting groove, which extends circumferentially along the second terminal. The second limiting groove is connected to the first limiting groove and the receiving groove respectively. The third limiting part can rotate within the second limiting groove and is mutually limited by the groove wall of the second limiting groove along the first direction.

[0031] In some embodiments, the first limiting groove and / or the second limiting groove penetrate the second terminal radially.

[0032] In some embodiments,

[0033] The first terminal includes a plurality of the third limiting portions, which are spaced apart along the circumference of the third body and are all connected to the outer periphery of the third body.

[0034] The second terminal has a plurality of first limiting grooves and a plurality of second limiting grooves, which are arranged alternately along the circumference of the second terminal, and each first limiting groove is connected to a second limiting groove.

[0035] In some embodiments,

[0036] The battery pack also has a second direction intersecting the first direction;

[0037] The first terminal includes:

[0038] The fourth body is connected to the housing and protrudes from the housing on one side along the first direction;

[0039] A fourth limiting part is connected to the side of the fourth body away from the housing. The fourth limiting part is spaced apart from the housing along the first direction. The fourth limiting part, the fourth body, and the housing form a third limiting groove.

[0040] The receiving groove extends through one side of the second terminal along the second direction. The fourth limiting part of the first terminal connected to the second terminal is inserted into the receiving groove, and part of the second terminal is located in the third limiting groove. The fourth limiting part and the second terminal mutually limit each other along the first direction.

[0041] Accordingly, the electrical device described in this application includes a battery pack as described in any of the foregoing embodiments.

[0042] Beneficial Effects: Compared with the prior art, a battery pack according to an embodiment of this application has a first direction; it includes a housing and multiple battery cells, the housing has a receiving cavity, the multiple battery cells are disposed in the receiving cavity and arranged along the first direction; each battery cell includes a shell, a first terminal and a second terminal, the first terminal is connected to the shell, and at least a portion of the first terminal protrudes from the shell on one side along the first direction; the second terminal is disposed opposite to the first terminal along the first direction, the second terminal is connected to the shell, at least a portion of the second terminal protrudes from the shell on the side of the shell away from the first terminal along the first direction, and the second terminal has a receiving groove; adjacent first terminals and second terminals of two adjacent battery cells along the first direction are connected, and at least a portion of the first terminal is inserted into the receiving groove. This application, by setting the first terminal and the second terminal at both ends of the shell respectively, allows the adjacent first terminals and second terminals of two adjacent battery cells to be directly connected, thereby realizing the series connection of two adjacent battery cells, eliminating the need for busbars and electrical isolation plates, thus effectively reducing the weight of the battery pack, reducing the occupation of the internal space of the battery pack, and contributing to the improvement of the volumetric energy density of the battery pack. In addition, a receiving slot is provided at the second terminal, so that the adjacent first terminals of two adjacent battery cells can be inserted into the receiving slot of the second terminal. At this time, the two battery cells can be connected in series, and the mutual limiting of the first and second terminals can also limit the mutual positioning of the two adjacent battery cells, ensuring connection stability.

[0043] Compared with the prior art, an electrical device according to an embodiment of this application includes a battery pack as described in any of the foregoing embodiments. It is understood that the electrical device of this application includes all the technical features and effects of the aforementioned battery pack, which will not be repeated here. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1This is an exploded view of a battery pack according to an embodiment of this application;

[0046] Figure 2 This is a schematic diagram of the positional relationship between two adjacent battery cells along the first direction in an embodiment of this application;

[0047] Figure 3 This is a cross-sectional view of two adjacent battery cells connected according to an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of the structure of a battery cell located on the side of the first terminal according to an embodiment of this application;

[0049] Figure 5 This is a schematic diagram of the structure of a battery cell located on the side of the second terminal according to an embodiment of this application;

[0050] Figure 6 This is an exploded view of two adjacent battery cells with elastic elements according to an embodiment of this application;

[0051] Figure 7 This is a cross-sectional view of two adjacent battery cells connected with an elastic element according to an embodiment of this application;

[0052] Figure 8 This is a schematic diagram of the connection between the first terminal and the second terminal when the elastic element in this embodiment is a conductive spring;

[0053] Figure 9 This is a schematic diagram of the structure of the conductive spring according to an embodiment of this application;

[0054] Figure 10 This is a schematic diagram of the connection between the first terminal and the second terminal when the elastic element in this application is a conductive spring sheet;

[0055] Figure 11 This is a schematic diagram of the structure of the conductive spring sheet according to an embodiment of this application;

[0056] Figure 12 This is a schematic diagram of the connection between the first terminal and the second terminal when the elastic element in an embodiment of this application is a conductive adhesive layer;

[0057] Figure 13 This is a schematic diagram of the structure of the conductive adhesive layer in an embodiment of this application;

[0058] Figure 14 This is a schematic diagram of the structure of a battery cell on the side where the first terminal is located, including the first body and the first limiting part, according to an embodiment of this application.

[0059] Figure 15 This is a schematic diagram of the structure of a battery cell on the side where the second terminal is located, including the second body and multiple clamping parts, according to an embodiment of this application.

[0060] Figure 16 This is a schematic diagram showing the connection relationship between the multiple clamping parts and the first limiting part in an embodiment of this application;

[0061] Figure 17 This is a side view of a battery cell including the third body and the third limiting part on the side where the first terminal is located, according to an embodiment of this application.

[0062] Figure 18 This is a side view of a battery cell including the third body and the third limiting part on the side where the second terminal is located, according to an embodiment of this application.

[0063] Figure 19 yes Figure 17 and Figure 18 The diagram shows the connection between the first and second terminals;

[0064] Figure 20 This is a side view of a battery cell that is spaced apart from the housing in an embodiment of this application;

[0065] Figure 21 This is a schematic diagram of the structure of a second terminal having a first limiting groove and a second limiting groove according to an embodiment of this application;

[0066] Figure 22 yes Figure 20 and Figure 21 The diagram shows the structural connection between the first and second terminals.

[0067] Figure 23 This is a schematic diagram of the structure of the first terminal including two third limiting portions according to an embodiment of this application;

[0068] Figure 24 This is a schematic diagram of the structure of the second terminal including two first limiting grooves and two second limiting grooves according to an embodiment of this application;

[0069] Figure 25 yes Figure 23 and Figure 24 The diagram shows the structural connection between the first and second terminals.

[0070] Figure 26 This is a schematic diagram of the structure of a battery cell in an embodiment of this application, showing that the receiving groove is disposed on one side of the first terminal along the second direction and the second terminal includes the fourth body and the fourth limiting part.

[0071] Figure 27 yes Figure 26 The diagram shows the structure of the connection between the first terminal and the second terminal.

[0072] Explanation of reference numerals in the attached drawings: 100, housing; 110, receiving cavity; 200, battery cell; 210, casing; 220, first terminal; 221, first body; 222, first limiting part; 223, third body; 224, third limiting part; 225, fourth body; 226, fourth limiting part; 227, third limiting groove; 230, second terminal; 231, receiving groove; 232, second body; 233, clamping part; 234, elastic body; 235, second limiting part; 236, first limiting groove; 237, second limiting groove; 240, elastic element; 241, conductive spring; 242, conductive spring sheet; 243, conductive adhesive layer; X, first direction; Z, second direction. Detailed Implementation

[0073] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0074] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships 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 on this application. 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, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0075] It should also be noted that in the accompanying drawings of this application, arrows labeled X indicate the first direction X, and arrows labeled Z indicate the second direction Z. The introduction of the first direction X and the second direction Z is to facilitate the description of the structural positional relationship of the battery pack, thereby aiding in understanding its structure. In the embodiments of this application, the first direction X is the direction in which the multiple battery cells 200 are arranged, and it is also the length direction of the battery pack; the second direction Z is the height direction of the battery pack; and the first direction X and the second direction Z intersect, and further, the first direction X and the second direction Z are perpendicular.

[0076] In related technologies, battery packs typically contain square or cylindrical batteries with terminals on the same side. Adjacent batteries are connected in series and parallel via busbars. In order to ensure the insulation performance between the busbars and the battery casing, an additional electrical isolation plate is usually installed. This results in a large number of structural components inside the battery pack, which not only increases the weight of the batteries but also occupies internal space, which is not conducive to improving the volumetric energy density of the battery pack.

[0077] In view of this, embodiments of this application provide a battery pack designed to solve the above-mentioned problems.

[0078] Please refer to the following: Figure 1 , Figure 2 and Figure 3 This application provides a battery pack having a first direction X and including a housing 100 and a plurality of battery cells 200. The housing 100 has a receiving cavity 110, and the plurality of battery cells 200 are disposed in the receiving cavity 110 and arranged along the first direction X. Each battery cell 200 includes a housing 210, a first terminal 220 and a second terminal 230. The first terminal 220 is connected to the housing 210, and at least a portion of the first terminal 220 protrudes from one side of the housing 210 along the first direction X. The second terminal 230 is disposed opposite to the first terminal 220 along the first direction X, and is connected to the housing 210. At least a portion of the second terminal 230 protrudes from the side of the housing 210 away from the first terminal 220 along the first direction X. The second terminal 230 has a receiving groove 231. The adjacent first terminals 220 and second terminals 230 of two adjacent battery cells 200 along the first direction X are connected, and at least a portion of the first terminal 220 is inserted into the receiving groove 231.

[0079] In this embodiment, by providing first terminals 220 and second terminals 230 at both ends of the housing 210, adjacent first terminals 220 and second terminals 230 of two adjacent battery cells 200 can be directly connected, thus achieving series connection of the two adjacent battery cells 200. This eliminates the need for busbars and electrical isolation boards, effectively reducing the weight of the battery pack and the space occupied inside the battery pack, which is beneficial to improving the volumetric energy density of the battery pack. In addition, a receiving groove 231 is provided in the second terminal 230, so that adjacent first terminals 220 of two adjacent battery cells 200 can be inserted into the receiving groove 231 of the second terminal 230. This not only achieves series connection of the two battery cells 200, but also ensures the connection stability by limiting the mutual positioning of the two adjacent battery cells 200 through the mutual limiting of the first terminals 220 and the second terminals 230.

[0080] It should be noted that the first terminal 220 and the second terminal 230 are disposed opposite each other on both sides of the battery cell 200, and preferably share a common central axis. In this case, the conductive connection between adjacent first terminals 220 and second terminals 230 of two adjacent battery cells 200 can be achieved by arbitrarily adjusting the arrangement order of multiple battery cells 200. Furthermore, the first terminal 220 and the second terminal 230 can be located at any position on the end face of the battery cell 200, as long as their positions are consistent and they are coaxially arranged.

[0081] It should also be noted that both the first terminal 220 and the second terminal 230 are poles, and do not specifically refer to any particular type of pole. Specifically, the first terminal 220 can be the positive pole and the second terminal 230 can be the negative pole, or the first terminal 220 can be the negative pole and the second terminal 230 can be the positive pole.

[0082] In the embodiments of this application, the housing 210 of the battery cell 200 can have any structure, preferably one that is easy to fix. The housing 210 can be square or have one side that is curved. The housing 210 has an inner cavity, and the inner cavity contains a battery cell, which is electrically connected to the first terminal 220 and the second terminal 230 respectively.

[0083] It should also be noted that, in the embodiments of this application, the first terminal 220 and the second terminal 230 can both be cylindrical terminals or terminals with a polygonal cross-section. Correspondingly, the receiving groove 231 can also be a cylindrical groove or a groove with a polygonal opening. When a terminal with a polygonal cross-section and a corresponding shape of receiving groove 231 are matched, the positions of the first terminal 220 and the second terminal 230 along the circumferential direction can be limited, preventing the first terminal 220 from rotating in the receiving groove 231.

[0084] Please combine Figure 3 , Figure 4 and Figure 5 In some embodiments, the receiving groove 231 is disposed on the side of the second terminal 230 away from the housing 210 along the first direction X; the first terminal 220 connected to the second terminal 230 is inserted into the receiving groove 231 along the first direction X.

[0085] In this embodiment, by setting the receiving groove 231 on the side of the second terminal 230 away from the housing 210, the receiving groove 231 can be directly facing the adjacent first terminal 220. When multiple battery cells 200 are arranged and connected, the adjacent first terminals 220 can be directly inserted into the receiving groove 231 of the second terminal 230, realizing the rapid docking and assembly of adjacent battery cells 200.

[0086] In this embodiment, the depth of the receiving groove 231 on the second terminal 230 can be set according to requirements, and can accommodate only a portion of the first terminal 220 or the entire first terminal 220. When the first terminal 220 is completely accommodated in the receiving groove 231, after the first terminals 220 and second terminals 230 of two adjacent battery cells 200 are connected, the size of the gap between the adjacent end faces of the two adjacent battery cells 200 is the size of the second terminal 230 between the two end faces.

[0087] It should be noted that the first terminal 220 and the second terminal 230 in this embodiment of the application can be connected by an interference fit. The first terminal 220 is directly inserted into the receiving groove 231 of the second terminal 230 by interference fit, which can ensure the stability of the connection between the first terminal 220 and the second terminal 230.

[0088] Please refer to the following: Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 In some embodiments, the battery cell 200 further includes an elastic member 240, which is disposed in the receiving groove 231 and electrically connected to the second terminal 230. The elastic member 240 elastically abuts against and is electrically connected to the first terminal 220 located in the receiving groove 231.

[0089] In this embodiment, by providing an elastic element 240 in the receiving groove 231, the elastic element 240 is an elastic conductor. The elastic element 240 can be squeezed and deformed after the first terminal 220 is inserted into the receiving groove 231. The two ends of the elastic element 240 abut against the bottom of the receiving groove 231 (i.e., the second terminal 230) and the first terminal 220, respectively, thereby further ensuring the stability of the conductive connection between the first terminal 220 and the second terminal 230 after the first terminal 220 is inserted into the receiving groove 231.

[0090] Please continue to refer to the following: Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 Furthermore, in some embodiments, the elastic element 240 is any one of the conductive spring 241, conductive sheet 242, and conductive adhesive layer 243.

[0091] In this embodiment of the application, the elastic element 240 can be as follows: Figure 8 and Figure 9 The conductive spring 241 shown can also be as follows: Figure 10 and Figure 11 The conductive spring 242 shown can also be as follows: Figure 12 and Figure 13 The conductive adhesive layer 243 shown above, and the above elastic elements 240 can all be squeezed and deformed after the first terminal 220 is inserted into the receiving groove 231, and make full contact with the first terminal 220 and the second terminal 230 respectively, thereby realizing the conductive connection of the first terminal 220, the elastic element 240 and the second terminal 230, and ensuring the stability of the conductive connection between adjacent battery cells 200.

[0092] Please refer to the following: Figure 14 , Figure 15 and Figure 16 In some embodiments, the first terminal 220 includes a first body 221 and a first limiting portion 222. The first body 221 is connected to the housing 210 and protrudes from the housing 210 on one side along the first direction X. The first limiting portion 222 is disposed at the end of the first body 221 away from the housing 210 along the first direction X and is disposed around the outer periphery of the first body 221. The first limiting portion 222 is spaced apart from the housing 210 along the first direction X. The second terminal 230 includes a second body 232 and a plurality of clamping portions 233. The second body 232 is connected to the housing 210. The first terminal 220 protrudes from the housing 210 on the side away from the first limiting portion 222; a plurality of clamping portions 233 are disposed on the side of the second body 232 away from the housing 210 along the first direction X, and are spaced apart along the circumference of the second body 232; the plurality of clamping portions 233 are connected to the second body 232 to form a receiving groove 231; the clamping portions 233 are configured to be deformable along the radial direction of the second terminal 230, the clamping portions 233 clamp the outer peripheral side of the first terminal 220 located in the receiving groove 231, and the clamping portions 233 and the first limiting portion 222 mutually limit each other along the first direction X.

[0093] In this embodiment, the first terminal 220 is configured as a combination of the first body 221 and the first limiting part 222, and the second terminal 230 is configured as a combination of the second body 232 and multiple clamping parts 233. The multiple clamping parts 233 are arranged around the second body 232 to form a receiving groove 231. During the process of inserting the first terminal 220 into the receiving groove 231 of the second terminal 230, the first limiting part 222 pushes the multiple clamping parts 233 radially outward. After the multiple clamping parts 233 open to a certain size, at least part of the first limiting part 222 and the first body 221 smoothly enter the receiving groove 231. Then the clamping parts 233 automatically reset and clamp the first terminal 220, realizing the relative insertion of the first terminal 220 and the second terminal 230. The clamping part 233 and the first limiting part 222 mutually limit each other along the first direction X, which can effectively prevent the first terminal 220 from coming out of the receiving groove 231 and ensure the stability of the connection between the first terminal 220 and the second terminal 230.

[0094] For further details, please refer to the following: Figure 15 and Figure 16 In some embodiments, the clamping part 233 includes an elastic body 234 and a second limiting part 235. The elastic body 234 is disposed on the side of the second body 232 away from the housing 210 along the first direction X. The second limiting part 235 is connected to the side of the elastic body 234 away from the second body 232 along the first direction X, and the orthographic projection of the second limiting part 235 on the second body 232 along the first direction X is located in the receiving groove 231. The second limiting part 235 abuts against the first limiting part 222 of the first terminal 220 located in the receiving groove 231 along the first direction X.

[0095] In this embodiment, the multiple clamping parts 233 are independent of each other and have a certain elasticity. The elastic body 234 of each clamping part 233 can deform and reset radially outward, thereby driving the second limiting part 235 to move and reset radially outward. When the first limiting part 222 reaches the receiving groove 231 and is located on the side of the second limiting part 235 near the housing 210, the elastic body 234 automatically resets, driving the second limiting part 235 to reset. At this time, the first limiting part 222 and the second limiting part 235 are limited along the first direction X, realizing the limiting and fixing of the first terminal 220, and ensuring the stability of the connection between the first terminal 220 and the second terminal 230.

[0096] In this embodiment, the plurality of clamping parts 233 may be grippers with their claw ends facing each other.

[0097] Please refer to the following: Figure 17 , Figure 18 and Figure 19In some embodiments, the first terminal 220 includes a third body 223 and a third limiting portion 224. The third body 223 is connected to the housing 210 and protrudes from the housing 210 on one side along the first direction X. The third limiting portion 224 is disposed on the outer peripheral side of the third body 223 and is connected to the third body 223. The second terminal 230 has a first limiting groove 236, which penetrates the inner sidewall of the receiving groove 231 and communicates with the receiving groove 231. The third body 223 of the first terminal 220 connected to the second terminal 230 passes through the receiving groove 231, and the third limiting portion 224 passes through the first limiting groove 236.

[0098] In this embodiment, by setting the first terminal 220 as a combination of the third body 223 and the third limiting part 224, and by setting the first limiting groove 236 on the inner sidewall of the receiving groove 231 of the second terminal 230, the third limiting part 224 is inserted into the first limiting groove 236 at the same time as the first terminal 220 is inserted into the receiving groove 231. This can further achieve circumferential limiting of the first terminal 220 and the second terminal 230 after docking, preventing the first terminal 220 from rotating circumferentially in the receiving groove 231, thereby further improving the stability of the first terminal 220 and the second terminal 230 after docking.

[0099] In this embodiment, the first limiting groove 236 and the third limiting part 224 can be U-shaped or cuboid, which can achieve mutual locking and limiting.

[0100] Please refer to the following: Figure 20 , Figure 21 and Figure 22 In some embodiments, the third limiting part 224 is spaced apart from the housing 210 along the first direction X; the second terminal 230 also has a second limiting groove 237, which extends circumferentially along the second terminal 230 and is connected to the first limiting groove 236 and the receiving groove 231 respectively. The third limiting part 224 can rotate within the second limiting groove 237, and the third limiting part 224 is mutually limited by the groove wall of the second limiting groove 237 along the first direction X.

[0101] In this embodiment, by setting a third limiting part 224 at a distance from the housing 210, and simultaneously setting a second limiting groove 237 on the second terminal 230, and the second limiting groove 237 communicating with the first limiting groove 236, the third limiting part 224 can be inserted into the first limiting groove 236 first, and then rotated around the axial direction of the second terminal 230, so that the third limiting part 224 moves within the second limiting groove, and so that a portion of the second terminal 230 (i.e., the groove wall of the second limiting groove 237 on the side away from the housing 210) is located along the first direction X between the housing 210 of the adjacent battery cell 200 and the third limiting part 224, thereby realizing mutual limiting along the first direction X after the adjacent first terminals 220 and second terminals 230 of the two adjacent battery cells 200 are connected, further preventing the connection between the first terminals 220 and the second terminals 230 from loosening, thereby ensuring the stability of the connection between the two adjacent battery cells 200.

[0102] Preferably, in this embodiment of the application, the second limiting groove 237 extends circumferentially along the second terminal 230, and when the third limiting part 224 moves to the final position within the second limiting groove 237, the adjacent end faces of two adjacent battery cells 200 are completely opposite to each other.

[0103] Please refer to the following: Figure 24 and Figure 25 In some embodiments, the first limiting groove 236 and / or the second limiting groove 237 extend through the second terminal 230 radially.

[0104] In this embodiment, a first limiting groove 236 and / or a second limiting groove 237 are provided to penetrate the second terminal 230 radially. This can effectively reduce the processing difficulty of the first limiting groove 236 and the second limiting groove 237, and the assembly status of the third limiting part 224 can be observed from the outside of the receiving groove 231.

[0105] Specifically, the first limiting groove 236 may penetrate the second terminal 230 radially, or the second limiting groove 237 may penetrate the second terminal 230 radially, or the first limiting groove 236 and the second limiting groove 237 may penetrate the second terminal 230 radially.

[0106] Please refer to the following: Figure 23 , Figure 24 and Figure 25In some embodiments, the first terminal 220 includes a plurality of third limiting portions 224, which are spaced apart along the circumference of the third body 223 and are all connected to the outer periphery of the third body 223; the second terminal 230 has a plurality of first limiting grooves 236 and a plurality of second limiting grooves 237, which are alternately arranged along the circumference of the second terminal 230, and each first limiting groove 236 communicates with a second limiting groove 237.

[0107] In this embodiment of the application, by setting multiple third limiting parts 224, multiple first limiting grooves 236 and multiple second limiting grooves 237 to cooperate with each other, multi-point limiting of the connection between the first terminal 220 and the second terminal 230 can be realized, thereby further improving the limiting and fixing effect.

[0108] Among them, "multiple" can be two or more.

[0109] Please refer to the following: Figure 26 and Figure 27 In some embodiments, the battery pack also has a second direction Z intersecting the first direction X; the first terminal 220 includes a fourth body 225 and a fourth limiting portion 226. The fourth body 225 is connected to the housing 210 and protrudes from the housing 210 on one side along the first direction X; the fourth limiting portion 226 is connected to the side of the fourth body 225 away from the housing 210. The fourth limiting portion 226 is spaced apart from the housing 210 along the first direction X. The fourth limiting portion 226, the fourth body 225, and the housing 210 form a third limiting groove 227; the receiving groove 231 passes through one side of the second terminal 230 along the second direction Z. The fourth limiting portion 226 of the first terminal 220 connected to the second terminal 230 is inserted into the receiving groove 231, and a portion of the second terminal 230 is located in the third limiting groove 227. The fourth limiting portion 226 and the second terminal 230 mutually limit each other along the first direction X.

[0110] In this embodiment, by setting the first terminal 220 as the fourth body 225 and the fourth limiting part 226, forming the third limiting groove 227, and setting the opening of the receiving groove 231 in the axial direction perpendicular to the second terminal 230, the fourth limiting part 226 is directly inserted into the receiving groove 231, thereby realizing the connection between the first terminal 220 and the second terminal 230, and being able to limit the first terminal 220 and the second terminal 230 along the first direction X and the circumferential direction of the second terminal 230, preventing the first terminal 220 and the second terminal 230 from relative displacement, and ensuring the stability of the connection.

[0111] The battery pack of this application, by setting a special structure with a first terminal 220 and a second terminal 230 at both ends of the battery cell 200, realizes direct conductive connection between adjacent terminals of adjacent battery cells 200, thereby eliminating the need for busbars and electrical isolation boards, thus reducing the overall weight of the battery pack and saving internal space, which is beneficial to improving the volumetric energy density of the battery pack.

[0112] Accordingly, an electrical device according to an embodiment of this application includes a battery pack as described in any of the foregoing embodiments.

[0113] It is understood that the electrical device of this application includes all the technical features and effects of the aforementioned battery pack, which will not be repeated here.

[0114] Of course, the electrical devices referred to in this application can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; 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. This application does not impose any special limitations on the above-mentioned electrical devices.

[0115] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0116] The battery pack and power device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, Having a first direction; including: The box-shaped enclosure has a receiving cavity; Multiple battery cells are disposed in the receiving cavity and arranged along the first direction; the battery cells include: case; A first terminal is connected to the housing, and at least a portion of the first terminal protrudes from the housing on one side along the first direction; The second terminal is disposed opposite to the first terminal along the first direction. The second terminal is connected to the housing. At least a portion of the second terminal protrudes from the housing on the side away from the first terminal along the first direction. The second terminal has a receiving groove. The adjacent first terminals and second terminals of two adjacent battery cells along the first direction are connected. At least a portion of the first terminal is inserted into the receiving groove.

2. The battery pack according to claim 1, characterized in that, The receiving groove is disposed on the side of the second terminal away from the housing along the first direction; the first terminal connected to the second terminal is inserted into the receiving groove along the first direction.

3. The battery pack according to claim 2, characterized in that, The battery cell also includes an elastic element, which is disposed in the receiving groove and electrically connected to the second terminal. The elastic element elastically abuts against and is electrically connected to the first terminal located in the receiving groove.

4. The battery pack according to claim 3, characterized in that, The elastic element is any one of a conductive spring, a conductive sheet, or a conductive adhesive layer.

5. The battery pack according to claim 2, characterized in that, The first terminal includes: A first body is connected to the housing and protrudes from the housing on one side along the first direction; A first limiting part is disposed at one end of the first body away from the shell along the first direction, and is disposed around the outer periphery of the first body. The first limiting part is spaced apart from the shell along the first direction. The second terminal includes: The second body is connected to the housing and protrudes from the side of the housing away from the first limiting part; Multiple clamping portions are disposed on the side of the second body away from the housing along the first direction and spaced apart along the circumference of the second body; the multiple clamping portions are connected to the second body to form the receiving groove; the clamping portions are configured to be deformable along the radial direction of the second terminal, the clamping portions clamp the outer peripheral side of the first terminal located in the receiving groove, and the clamping portions and the first limiting portion limit each other along the first direction.

6. The battery pack according to claim 5, characterized in that, The clamping part includes: An elastic body is disposed on the side of the second body away from the housing along the first direction; The second limiting part is connected to the side of the elastic body away from the second body along the first direction, and the orthographic projection of the second limiting part on the second body along the first direction is located in the receiving groove. The second limiting part abuts against the first limiting part of the first terminal located in the receiving groove along the first direction.

7. The battery pack according to claim 2, characterized in that, The first terminal includes: The third body is connected to the housing and protrudes from the housing on one side along the first direction; The third limiting part is disposed on the outer peripheral side of the third body and is connected to the third body; The second terminal has a first limiting groove, which penetrates the inner wall of the receiving groove and communicates with the receiving groove; the third body of the first terminal connected to the second terminal passes through the receiving groove, and the third limiting part passes through the first limiting groove.

8. The battery pack according to claim 7, characterized in that, The third limiting part is spaced apart from the housing along the first direction; The second terminal also has a second limiting groove, which extends circumferentially along the second terminal. The second limiting groove is connected to the first limiting groove and the receiving groove respectively. The third limiting part can rotate within the second limiting groove and is mutually limited by the groove wall of the second limiting groove along the first direction.

9. The battery pack according to claim 8, characterized in that, The first limiting groove and / or the second limiting groove penetrate the second terminal radially.

10. The battery pack according to claim 8, characterized in that, The first terminal includes a plurality of the third limiting portions, which are spaced apart along the circumference of the third body and are all connected to the outer periphery of the third body. The second terminal has a plurality of first limiting grooves and a plurality of second limiting grooves, which are arranged alternately along the circumference of the second terminal, and each first limiting groove is connected to a second limiting groove.

11. The battery pack according to claim 1, characterized in that, The battery pack also has a second direction intersecting the first direction; The first terminal includes: The fourth body is connected to the housing and protrudes from the housing on one side along the first direction; A fourth limiting part is connected to the side of the fourth body away from the housing. The fourth limiting part is spaced apart from the housing along the first direction. The fourth limiting part, the fourth body, and the housing form a third limiting groove. The receiving groove extends through one side of the second terminal along the second direction. The fourth limiting part of the first terminal connected to the second terminal is inserted into the receiving groove, and part of the second terminal is located in the third limiting groove. The fourth limiting part and the second terminal mutually limit each other along the first direction.

12. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-11.

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