Battery pack and powered device

Abstract

The application discloses a battery pack and an electric device. The battery pack comprises a shell and a battery cell assembly arranged in the shell. The battery cell assembly comprises a plurality of battery cells arranged in a first direction. The battery cell comprises a shell body, a first end cover and a second end cover. The first end cover and the second end cover are arranged at two ends of the shell body along the first direction and are connected to the shell body. The first end cover is provided with a protrusion, and the second end cover is provided with a recess. The protrusion and the recess are electrically connected to the electrode assembly. In two adjacent battery cells along the first direction, the protrusion of one battery cell is arranged in the recess of the other battery cell, and the protrusion and the recess are connected to each other, which is beneficial to limiting the relative movement of the two battery cells along a direction perpendicular to the first direction, reducing the number of accessories for fixing the battery cell assembly in the battery pack, saving the manufacturing cost of the battery pack, and reducing the weight of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] Currently, in battery pack modules formed by multiple cylindrical cells, adjacent cells are connected by busbars, resulting in a complex structure that increases the assembly and manufacturing costs of battery pack modules. Summary of the Invention

[0003] In view of the above situation, it is necessary to provide a battery pack that reduces the number of internal mounting components and saves manufacturing costs.

[0004] Embodiments of this application provide a battery pack, including a housing and a cell assembly disposed within the housing. The cell assembly includes a plurality of cells stacked along a first direction. Each cell includes a housing and an electrode assembly disposed within the housing. The housing includes a main body, a first end cap, and a second end cap. The first and second end caps are located at opposite ends of the main body along the first direction and are both connected to the main body. The first end cap has a protrusion, and the second end cap has a recess. Both the protrusion and the recess are electrically connected to the electrode assembly. In two adjacent cells along the first direction, the protrusion of one cell is disposed within the recess of the other cell, and the protrusion and the recess are interconnected.

[0005] In the aforementioned battery pack, some of the battery cells in the cell assembly are stacked along a first direction. In two adjacent cells along the first direction, the protrusion on the first end cap of one cell is located in the recess on the second end cap of the other cell and is connected to each other. This helps to limit the relative movement of the two cells in a direction perpendicular to the first direction, which helps to reduce the number of accessories used to fix the cell assembly in the battery pack, saves the manufacturing cost of the battery pack, and also helps to reduce the weight of the battery pack.

[0006] In some embodiments of this application, the first end cap includes multiple protrusions, which are equally spaced around the center of the first end cap; the second end cap includes multiple recesses, which are equally spaced around the center of the second end cap; in two adjacent cells along the first direction, any protrusion of one cell is located within a recess of the other cell. By providing multiple protrusions on the first end cap and multiple recesses on the second end cap, the connection stability of two adjacent cells along the first direction is improved, and the shock resistance of the battery pack is enhanced. Furthermore, the multiple protrusions circling the center of the first end cap at equal intervals, and the multiple recesses circling the center of the second end cap at equal intervals, facilitate the connection of the first end cap to the second end cap, improve the connection efficiency of two adjacent cells along the first direction, and enhance the assembly efficiency of the battery pack.

[0007] In some embodiments of this application, the protrusion is provided with multiple spring-loaded portions. Viewed along a first direction, the multiple spring-loaded portions are arranged in a circle with the center of the protrusion as the center, and adjacent spring-loaded portions are separated. At least a portion of the spring-loaded portions is located within the recess and connects to the recess. By providing multiple spring-loaded portions on the protrusion, when the protrusion is inserted into the recess, the spring-loaded portions connect to the recess. The elastic deformation property of the spring-loaded portions helps to improve the stability of the connection between the protrusion and the recess and reduces the risk of poor contact between the protrusion and the recess.

[0008] In some embodiments of this application, the protrusion is further provided with a flange, which is disposed on the surface of the spring portion. When viewed along the first direction, the flange surrounds the spring portion. The recess is provided with a groove, which is recessed from the interior of the recess. At least a portion of the flange is located in the groove, which is beneficial to further improve the stability of the connection between the protrusion and the recess, reduce the risk of poor contact between the protrusion and the recess, improve the uniformity of the depth of each protrusion inserted into the recess, and reduce the risk of bottom collision damage between the protrusion and the recess.

[0009] In some embodiments of this application, the cell assembly further includes a sampling element located between two adjacent cells along a first direction and connected to a first end cap and / or a second end cap. The sampling element has a first through hole, through which a protrusion passes. By setting the sampling element, electrochemical information of multiple cells within the cell assembly can be obtained, which is beneficial for monitoring each cell. Furthermore, the sampling element is located between two adjacent cells along the first direction, allowing the two cells to clamp the sampling element, which helps reduce the number of accessories required to fix the sampling element, further saving the manufacturing cost of the battery pack and reducing its weight. At the same time, the protrusion passing through the first through hole helps restrict the movement of the sampling element relative to the cells, improving the stability of the connection between the sampling element and the cells, and enhancing the shock resistance of the battery pack.

[0010] In some embodiments of this application, the battery cell assembly includes a first battery cell and a second battery cell. The first battery cell is located at the end of the battery cell assembly in the opposite direction to a first direction, and the second battery cell is located at the end of the battery cell assembly in the first direction. The battery cell assembly also includes a first bus and a second bus. The first bus is disposed on the side of the first battery cell opposite to the second battery cell and is connected to a first end cap on the first battery cell. The second bus is disposed on the side of the second battery cell opposite to the first battery cell and is connected to a second end cap on the second battery cell. By providing the first bus and the second bus, the battery cell assembly can be connected to external devices to achieve charging and discharging. Furthermore, the first bus connecting to the first end cap of the first battery cell and the second bus connecting to the second end cap of the second battery cell helps to optimize the layout within the battery pack and improve its space utilization.

[0011] In some embodiments of this application, the first busbar is provided with a second through hole, the first end cap is provided with a first fixing hole, and the cell assembly further includes a first connector. A portion of the first connector passes through the second through hole and connects to the first fixing hole, so that the first busbar is fastened to the first cell, which is beneficial to improving the stability of the connection between the first busbar and the first cell and improving the shock resistance of the battery pack.

[0012] In some embodiments of this application, the second busbar is provided with a third through hole, the second end cap is provided with a second fixing hole, and the cell assembly further includes a second connector. A portion of the second connector passes through the third through hole and connects to the second fixing hole, so that the second busbar is fastened to the second cell, which is beneficial to improving the stability of the connection between the second busbar and the second cell and improving the shock resistance of the battery pack.

[0013] In some embodiments of this application, the first busbar is provided with a fourth through hole, through which a protrusion on the first battery cell passes. The fourth through hole can serve as a clearance device, reducing the impact of interference between the first busbar and the protrusion.

[0014] In some embodiments of this application, the cell assembly further includes a first end plate, a second end plate, and a fastening assembly. The first end plate is disposed on the side of the first busbar away from the first cell and is connected to the first busbar. The second end plate is disposed on the side of the second busbar away from the second cell and is connected to the second busbar. The fastening assembly connects the first end plate and the second end plate, which helps to improve the connection stability of each cell in the cell assembly and improve the shock resistance of the battery pack.

[0015] In some embodiments of this application, the battery pack further includes an adhesive component that connects the outer casing and the battery cell assembly. This improves the stability of the connection between the battery cell assembly and the outer casing, enhances the shock resistance of the battery pack, and reduces the number of accessories used to connect the battery cell assembly and the outer casing, thereby saving on the manufacturing cost of the battery pack.

[0016] Embodiments of this application also provide an electrical device including the battery pack of any of the foregoing embodiments.

[0017] In the aforementioned electrical equipment, some of the battery cells in the battery pack are stacked along a first direction, and in two adjacent battery cells along the first direction, the protrusion on the first end cap of one battery cell is located in the recess of the second end cap of the other battery cell and they are connected to each other. This helps to reduce the number of accessories used to fix the battery cell assembly in the battery pack, save the manufacturing cost of the battery pack, reduce the impact of the cost of the battery pack on the electrical equipment, and also helps to reduce the weight of the battery pack, thus reducing the impact of the weight of the battery pack on the electrical equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery pack structure in one embodiment of this application.

[0019] Figure 2 This is a partial structural diagram of the battery pack in one embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the structure of two adjacent cells along the first direction in a phase-separated state in one embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the structure of two adjacent cells along the first direction in a phase-separated state in one embodiment of this application.

[0022] Figure 5 This is an exploded view of a battery cell in one embodiment of this application.

[0023] Figure 6 This is a schematic diagram of the structure of the first end cap in one embodiment of this application.

[0024] Figure 7 This is a schematic diagram of the structure of the second end cap in one embodiment of this application.

[0025] Figure 8 yes Figure 7 The view shown is of section VI I I-VI II.

[0026] Figure 9 This is a schematic diagram of the structure of a battery cell assembly in one embodiment of this application.

[0027] Figure 10 This is an exploded view of a battery cell assembly in one embodiment of this application.

[0028] Figure 11 This is a schematic diagram of the structure of the sampling component in one embodiment of this application.

[0029] Figure 12 This is a schematic diagram of the structure of an electrical device in one embodiment of this application.

[0030] Explanation of main component symbols

[0031] Battery pack 100

[0032] Casing 10

[0033] First Wall 11

[0034] Second Wall 12

[0035] Third Wall 13

[0036] Fourth Wall 14

[0037] Fifth Wall 15

[0038] Sixth Wall 16

[0039] Containment cavity 17

[0040] Battery cell assembly 20

[0041] Cell 21

[0042] Casing 211

[0043] Main body 2111

[0044] First end cap 2112

[0045] Projection 21121

[0046] Shrapnel Section 21122

[0047] Flange 21123

[0048] First fixing hole 21124

[0049] Second end cap 2113

[0050] Recess 21131

[0051] Groove 21132

[0052] Second fixing hole 21133

[0053] Protective layer 2114

[0054] Electrode assembly 212

[0055] Series component 22

[0056] First cell 221

[0057] Second battery cell 222

[0058] Sample 23

[0059] First through hole 231

[0060] First busbar 241

[0061] Second through hole 2411

[0062] Fourth through hole 2412

[0063] Second busbar 242

[0064] Third through hole 2421

[0065] First connector 251

[0066] Second connector 252

[0067] First end plate 261

[0068] Second end plate 262

[0069] Fastening component 27

[0070] Screw 271

[0071] Nut 272

[0072] First protective component 281

[0073] Second protective component 282

[0074] First circuit board 30

[0075] Adhesive component 40

[0076] 200 electrical appliances

[0077] First direction X

[0078] Second direction Y

[0079] Third direction Z

[0080] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0081] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0082] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have a component that is centrally located. When a component is considered to be "set" on another component, it can be directly set on the other component or may also have a component that is centrally located.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0084] Embodiments of this application provide a battery pack, including a housing and a cell assembly disposed within the housing. The cell assembly includes a plurality of cells stacked along a first direction. Each cell includes a housing and an electrode assembly disposed within the housing. The housing includes a main body, a first end cap, and a second end cap. The first and second end caps are located at opposite ends of the main body along the first direction and are both connected to the main body. The first end cap has a protrusion, and the second end cap has a recess. Both the protrusion and the recess are electrically connected to the electrode assembly. In two adjacent cells along the first direction, the protrusion of one cell is disposed within the recess of the other cell, and the protrusion and the recess are interconnected.

[0085] In the aforementioned battery pack, some of the battery cells in the cell assembly are stacked along a first direction. In two adjacent cells along the first direction, the protrusion on the first end cap of one cell is located in the recess of the second end cap of the other cell and they are connected to each other. This helps to limit the relative movement of the two cells in a direction perpendicular to the first direction, which helps to reduce the number of accessories used to fix the cell assembly in the battery pack, saves the manufacturing cost of the battery pack, and also helps to reduce the weight of the battery pack.

[0086] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0087] like Figures 1 to 5 As shown, an embodiment of this application provides a battery pack 100, including a housing 10 and a cell assembly 20 disposed within the housing 10. The cell assembly 20 includes a plurality of cells 21 stacked along a first direction X. Each cell 21 includes a housing 211 and an electrode assembly 212 disposed within the housing 211. The housing 211 includes a main body 2111, a first end cap 2112, and a second end cap 2113. The first end cap 2112 and the second end cap 2113 are respectively located at both ends of the main body 2111 along the first direction X and are both connected to the main body 2111. The first end cap 2112 has a protrusion 21121, and the second end cap 2113 has a recess 21131. Both the protrusion 21121 and the recess 21131 are electrically connected to the electrode assembly 212. In two adjacent cells 21 along the first direction X, the protrusion 21121 of one cell 21 is disposed in the recess 21131 of the other cell 21, and the protrusion 21121 and the recess 21131 are connected to each other.

[0088] In the aforementioned battery pack 100, some of the cells 21 in the cell assembly 20 are stacked along the first direction X. Among two adjacent cells 21 along the first direction X, the protrusion 21121 on the first end cap 2112 of one cell 21 is located in the recess 21131 of the second end cap 2113 of the other cell 21 and they are connected to each other. This helps to limit the relative movement of the two cells 21 in a direction perpendicular to the first direction X, which helps to reduce the number of accessories used to fix the cell assembly 20 in the battery pack 100, saves the manufacturing cost of the battery pack 100, and also helps to reduce the weight of the battery pack 100. At the same time, by connecting the protrusion 21121 to the recess 21131, the two adjacent cells 21 can be electrically connected. The plug-in connection of the protrusion 21121 and the recess 21131 helps to improve the stability of the electrical connection between the two adjacent cells 21 and improve the shock resistance of the battery pack 100.

[0089] In one embodiment, the outer casing 10 includes a first wall 11, a second wall 12, a third wall 13, a fourth wall 14, a fifth wall 15, and a sixth wall 16. The first wall 11 and the third wall 13 are arranged along a first direction X, the second wall 12 and the fourth wall 14 are arranged along a second direction Y, and the fifth wall 15 and the sixth wall 16 are arranged along a third direction Z. The first wall 11 and the third wall 13 are both connected to the second wall 12 and the fourth wall 14, and the first wall 11, the second wall 12, the third wall 13, and the fourth wall 14 are all connected to the fifth wall 15 and the sixth wall 16. In one embodiment, the first wall 11, the second wall 12, the third wall 13, the fourth wall 14, and the sixth wall 16 are connected to form a receiving cavity 17. The battery cell assembly 20 is located within the receiving cavity 17. The fifth wall 15, after connecting the first wall 11, the second wall 12, the third wall 13, and the fourth wall 14, shields the receiving cavity 17. The second direction Y is perpendicular to the first direction X, and the third direction Z is perpendicular to both the first direction X and the second direction Y.

[0090] In one embodiment, the first wall 11, the second wall 12, the third wall 13, the fourth wall 14, and the sixth wall 16 are integrally formed, which simplifies the preparation and assembly process of the outer casing 10 and saves the preparation and assembly costs of the battery pack 100. In another embodiment, the first wall 11, the second wall 12, the third wall 13, the fourth wall 14, and the sixth wall 16 are formed by melting and solidifying plastic using injection molding equipment, which further simplifies the preparation and assembly process of the outer casing 10, saves the preparation and assembly costs of the battery pack 100, and also helps to reduce the weight of the outer casing 10 and reduce the impact of the weight of the outer casing 10 on the battery pack 100.

[0091] In one embodiment, the fifth wall 15 is formed by melting and solidifying plastic using an injection molding machine. This helps to further simplify the preparation and assembly process of the outer shell 10, save the preparation and assembly costs of the battery pack 100, and also helps to reduce the weight of the outer shell 10 and reduce the impact of the weight of the outer shell 10 on the battery pack 100.

[0092] In one embodiment, the outer casing 10 is made of metal, which helps to improve its structural strength and reduce the risk of the battery pack 100 being damaged by foreign objects.

[0093] In one embodiment, the battery pack 100 further includes a first circuit board 30 located within the receiving cavity 17 and electrically connected to the battery cells 21 in the battery cell assembly 20. The first circuit board 30 is capable of controlling the charging and discharging of the battery cell assembly 20.

[0094] In one embodiment, the first circuit board 30 includes a BMS (Battery Management System) component. The BMS component includes multiple electronic components that can perform functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for the battery cell 21.

[0095] In one embodiment, the first circuit board 30 and the cell assembly 20 are arranged along the first direction X and located between the first wall 11 and the cell assembly 20, which helps to reduce the length of the battery pack 100 along the second direction Y or the third direction Z.

[0096] In one embodiment, the electrode assembly 212 includes a first electrode, a second electrode, and a diaphragm (not shown), with the diaphragm disposed between the first electrode and the second electrode, and the first electrode, the diaphragm, and the second electrode wound together to form the electrode assembly 212.

[0097] In one embodiment, the first end cap 2112 is electrically connected to the first electrode, and the second end cap 2113 is electrically connected to the second electrode. The first end cap 2112 and the second end cap 2113 can serve as output or input terminals of the battery cell 21, enabling the battery cell 21 to charge and discharge. In one embodiment, the first electrode is a positive electrode, the first end cap 2112 is the positive terminal of the battery cell 21, the second electrode is a negative electrode, and the second end cap 2113 is the negative terminal of the battery cell 21. In another embodiment, the first electrode is a negative electrode, the first end cap 2112 is the negative terminal of the battery cell 21, the second electrode is a positive electrode, and the second end cap 2113 is the positive terminal of the battery cell 21.

[0098] In one embodiment, the main body 2111 is made of an insulating material, which helps to reduce the risk of short circuits between the first end cap 2112 and the second end cap 2113 and between different cells 21.

[0099] In one embodiment, a protective layer 2114 is provided on the outer surface of the main body 2111. The protective layer 2114 can provide insulation protection for the main body 2111, reducing the risk of damage to the main body 2111 from external objects, and further reducing the risk of short circuits between different cells 21. Optionally, the protective layer 2114 is a PVC (Polyvinyl chloride, abbreviated as PVC) insulating film.

[0100] In one embodiment, the first end cap 2112 includes a plurality of protrusions 21121, which are arranged at equal intervals around the center of the first end cap 2112. This simplifies the processing and manufacturing process of the first end cap 2112 and saves the processing and manufacturing cost of the first end cap 2112.

[0101] In one embodiment, the second end cap 2113 includes a plurality of recesses 21131, which are arranged at equal intervals around the center of the second end cap 2113. This helps to simplify the processing and manufacturing process of the first end cap 2112 and save the processing and manufacturing cost of the first end cap 2112.

[0102] In one embodiment, in two adjacent cells 21 along the first direction X, any protrusion 21121 of one cell 21 is located within a recess 21131 of the other cell 21. By providing multiple protrusions 21121 on the first end cap 2112 and multiple recesses 21131 on the second end cap 2113, it is beneficial to improve the connection stability of the two adjacent cells 21 along the first direction X and improve the shock resistance of the battery pack 100. Furthermore, the multiple protrusions 21121 are arranged around the center of the first end cap 2112 at equal intervals, and the multiple recesses 21131 are arranged around the center of the second end cap 2113 at equal intervals, which facilitates the connection of the first end cap 2112 to the second end cap 2113, improves the connection efficiency of the two adjacent cells 21 along the first direction X, and improves the assembly efficiency of the battery pack 100.

[0103] In one embodiment, the number of protrusions 21121 on the first end cap 2112 is equal to the number of recesses 21131 on the second end cap 2113, and their positions correspond one-to-one. Optionally, the number of protrusions 21121 on the first end cap 2112 is three, and the number of recesses 21131 on the second end cap 2113 is three.

[0104] like Figure 6 and Figure 7As shown, in one embodiment, the protrusion 21121 is provided with a plurality of spring pieces 21122. Viewed along the first direction X, the plurality of spring pieces 21122 are arranged in a circle around the center of the protrusion 21121, and adjacent spring pieces 21122 are separated. When the spring pieces 21122 on the protrusion 21121 are subjected to an external force, the spring pieces 21122 can undergo elastic deformation to change the outer diameter of the protrusion 21121.

[0105] In one embodiment, at least a portion of the spring piece 21122 is located within and connected to the recess 21131. During the insertion of the protrusion 21121 into the recess 21131, the recess 21131 acts on the spring piece 21122, causing the spring piece 21122 to bend and deform towards the center of the protrusion 21121, facilitating the insertion of the protrusion 21121 into the recess 21131. After at least a portion of the protrusion 21121 is inserted into the recess 21131, the spring piece 21122 connects to the recess 21131. The elastic restoring force of the spring piece 21122, moving away from the center of the protrusion 21121, helps improve the stability of the connection between the protrusion 21121 and the recess 21131, reducing the risk of poor contact between the protrusion 21121 and the recess 21131.

[0106] In one embodiment, the number of spring pieces 21122 on the protrusion 21121 is three. The three spring pieces 21122 are arranged at equal intervals around the center of the protrusion 21121, which facilitates the deformation of the end of the protrusion 21121 to insert into the recess 21131.

[0107] In one embodiment, the protrusion 21121 is further provided with a flange 21123, which is disposed on the surface of the spring portion 21122. Viewed along the first direction X, the flange 21123 surrounds the spring portion 21122. When at least a portion of the protrusion 21121 is inserted into the recess 21131, the flange 21123 connects to the recess 21131, which helps to further improve the stability of the connection between the protrusion 21121 and the recess 21131 and reduces the risk of poor contact between the protrusion 21121 and the recess 21131.

[0108] like Figures 6 to 8 As shown, in one embodiment, the recess 21131 is provided with a groove 21132, which is recessed from the interior of the recess 21131. At least a portion of the flange 21123 is located within the groove 21132, which helps to improve the uniformity of the insertion depth of each protrusion 21121 into the recess 21131, reduces the risk of collision damage between the protrusion 21121 and the bottom of the recess 21131, helps to limit the movement of the two interconnected cells 21 along the first direction X, and further improves the connection stability of the two adjacent cells 21.

[0109] like Figure 9 and Figure 10 As shown, in one embodiment, multiple battery cells 21 are connected in series along a first direction X to form a series assembly 22.

[0110] In one embodiment, the battery cell assembly 20 includes a plurality of series-connected components 22, which are arranged along a second direction Y and a third direction Z, which is beneficial to improving the space utilization rate within the battery pack 100 and increasing the energy storage capacity of the battery pack 100.

[0111] In one embodiment, the different series components 22 are connected in series and / or in parallel.

[0112] As an example, the following description will be further illustrated by the following example where all the series components 22 are connected in parallel, the positive output terminals of all the series components 22 are located at the same end in the first direction X, and the negative output terminals are located at the other end in the first direction X.

[0113] like Figures 9 to 11 As shown, in one embodiment, the cell assembly 20 further includes a sampling element 23, which is located between two adjacent cells 21 along a first direction X and connected to a first end cap 2112 and / or a second end cap 2113. By setting the sampling element 23, electrochemical information of multiple cells 21 within the cell assembly 20 can be obtained, which is beneficial for monitoring each cell 21. The electrochemical information includes the voltage, resistance, temperature, etc. of the cell 21.

[0114] In one embodiment, the sampling element 23 is a nickel sheet. In another embodiment, the sampling element 23 is a second circuit board.

[0115] In one embodiment, the sampling element 23 is connected to a first end cap 2112 of one of the battery cells 21. In another embodiment, the sampling element 23 is connected to a second end cap 2113 of one of the battery cells 21.

[0116] In one embodiment, the sampling member 23 is connected to the first end cap 2112 of one of the battery cells 21 and the second end cap 2113 of the other battery cell 21. The first end cap 2112 and the second end cap 2113 clamp and fix the sampling member 23, which helps to reduce the number of accessories for fixing the sampling member 23, further saves the manufacturing cost of the battery pack 100, and also helps to reduce the weight of the battery pack 100.

[0117] In one embodiment, the sampling member 23 is provided with a first through hole 231, and the protrusion 21121 passes through the first through hole 231. The protrusion 21121 passing through the first through hole 231 helps reduce the risk of interference between the sampling member 23 and the protrusion 21121, and also helps limit the relative movement of the sampling member 23 and the battery cell 21 in a direction perpendicular to the first direction X, improving the stability of the connection between the sampling member 23 and the battery cell 21, and improving the shock resistance of the battery pack 100.

[0118] In one embodiment, the number of first through holes 231 on the sampling member 23 is multiple, and they correspond to the positions of the protrusions 21121 in each of the series components 22. In one embodiment, when viewed along the first direction X, each protrusion 21121 is located within a first through hole 231 and is separate from the first through hole 231, which helps to reduce the direction of interference between the sampling member 23 and the first through hole 231.

[0119] In one embodiment, there are multiple sampling elements 23, and sampling elements 23 are provided between two adjacent cells 21 along the first direction X, which is beneficial for obtaining electrochemical information of different cells 21.

[0120] In one embodiment, each series assembly 22 includes a first battery cell 221 and a second battery cell 222. The first battery cell 221 is located at the end of the series assembly 22 in the opposite direction to the first direction X, and the second battery cell 222 is located at the end of the series assembly 22 in the first direction X. A first end cap 2112 of the first battery cell 221 is located at the end of the series assembly 22 in the opposite direction to the first direction X, and a second end cap 2113 of the second battery cell 222 is located at the end of the series assembly 22 in the first direction X. The first end cap 2112 of the first battery cell 221 and the second end cap 2113 of the second battery cell 222 can serve as output terminals or input terminals of the series assembly 22.

[0121] The battery cell assembly 20 also includes a first bus 241 and a second bus 242. The first bus 241 is located on the side of the first battery cell 221 away from the second battery cell 222 and is connected to the first end cap 2112 on the first battery cell 221 of the multiple series-connected assemblies 22. The second bus 242 is located on the side of the second battery cell 222 away from the first battery cell 221 and is connected to the second end cap 2113 on the second battery cell 222 of the multiple series-connected assemblies 22. Both the first bus 241 and the second bus 242 are electrically connected to the first circuit board 30. By setting the first busbar 241 and the second busbar 242, multiple series components 22 can be connected in parallel. The first busbar 241 and the second busbar 242 can serve as the output or input terminals of the cell assembly 20, enabling the cell assembly 20 to be electrically connected to the first circuit board 30 to achieve charging and discharging. Furthermore, the first busbar 241 connects to the first end cap 2112 of the first cell 221 of the multiple series components 22, and the second busbar 242 connects to the second end cap 2113 of the second cell 222 of the multiple series components 22, which helps to optimize the layout within the battery pack 100 and improve its space utilization.

[0122] like Figure 6 and Figure 10As shown, in one embodiment, the first busbar 241 is provided with a second through hole 2411, the first end cap 2112 on the first cell 221 is provided with a first fixing hole 21124, and the cell assembly 20 further includes a first connector 251. A portion of the first connector 251 passes through the second through hole 2411 and connects to the first fixing hole 21124, so that the first busbar 241 is fastened to the first end cap 2112 of the first cell 221, which helps to improve the stability of the connection between the first busbar 241 and the first cell 221 and improve the shock resistance of the battery pack 100.

[0123] In one embodiment, the number of second through holes 2411 on the first busbar 241 is relative to the number and position of the first fixing holes 21124 on the first end cap 2112 of the first cell 221 in the multiple series components 22. There are multiple first connectors 251, and different first connectors 251 are connected to different first fixing holes 21124 through different second through holes 2411, so that the first busbar 241 is tightly connected to the first end cap 2112 of the first cell 221 in the multiple series components 22. This is beneficial to improve the stability of the connection between the first busbar 241 and the cell 21 and improve the shock resistance of the battery pack 100.

[0124] like Figure 7 and Figure 10 As shown, in one embodiment, the second busbar 242 is provided with a third through hole 2421, the second end cap 2113 on the second cell 222 is provided with a second fixing hole 21133, and the cell assembly 20 also includes a second connector 252. A portion of the second connector 252 passes through the third through hole 2421 and connects to the second fixing hole 21133, so that the second busbar 242 is fastened to the second end cap 2113 of the second cell 222, which helps to improve the stability of the connection between the second busbar 242 and the second cell 222 and improve the shock resistance of the battery pack 100.

[0125] In one embodiment, the number of third through holes 2421 on the second busbar 242 corresponds to the number and position of the second fixing holes 21133 on the second end cap 2113 of the second cell 222 in the multiple series components 22. There are multiple second connectors 252, and different second connectors 252 are connected to different second fixing holes 21133 through different third through holes 2421, so that the second busbar 242 is tightly connected to the second end cap 2113 of the second cell 222 in the multiple series components 22. This helps to improve the stability of the connection between the second busbar 242 and the cell 21 and improve the shock resistance of the battery pack 100.

[0126] In one embodiment, the first fixing hole 21124 is provided with an internal thread, and the first connecting member 251 is a screw. The screw part passes through the second through hole 2411 and connects to the internal thread of the first fixing hole 21124, which is beneficial to improving assembly efficiency.

[0127] In one embodiment, the second fixing hole 21133 is provided with an internal thread, and the second connector 252 is a screw. The screw part passes through the third through hole 2421 and connects to the internal thread of the second fixing hole 21133, which is beneficial to improving assembly efficiency.

[0128] In one embodiment, the first bus 241 is provided with a fourth through hole 2412, through which the protrusion 21121 on the first battery cell 221 passes. The fourth through hole 2412 can serve as a clearance, reducing the impact of interference between the first bus 241 and the protrusion 21121.

[0129] In one embodiment, the number of fourth through holes 2412 on the first bus 241 is multiple. The number of fourth through holes 2412 is relative to the number and position of protrusions 21121 on the first cell 221 in the multiple series components 22. Each protrusion 21121 passes through the fourth through hole 2412, which helps to further reduce the risk of interference between the first bus 241 and the protrusions 21121 of the first cell 221.

[0130] In one embodiment, the battery cell assembly 20 further includes a first end plate 261, a second end plate 262, and a fastening assembly 27. The first end plate 261 is disposed on the side of the first busbar 241 away from the first battery cell 221 and is connected to the first busbar 241. The second end plate 262 is disposed on the side of the second busbar 242 away from the second battery cell 222 and is connected to the second busbar 242. The fastening assembly 27 connects the first end plate 261 and the second end plate 262, which helps to improve the connection stability of each battery cell 21 in the battery cell assembly 20 and improve the shock resistance of the battery pack 100.

[0131] In one embodiment, the fastening assembly 27 includes a screw 271 and a nut 272. A portion of the screw 271 is located on the side of the first end plate 261 opposite to the first busbar 241 and is connected to the first end plate 261. A portion of the screw 271 passes through the first end plate 261, the first busbar 241, the gap between adjacent series assemblies 22, the second busbar 242, and the second end plate 262, and extends to the side of the second end plate 262 opposite to the second busbar 242. The nut 272 is located on the side of the second end plate 262 opposite to the second busbar 242 and is connected to the second end plate 262 and the screw 271. The screw 271 and the nut 272 connect and fasten the first end plate 261 and the second end plate 262, facilitating assembly.

[0132] In one embodiment, the first end plate 261 is a metal plate, which helps to improve its structural strength and reduce the risk of deformation damaging the battery cell 21. In another embodiment, the second end plate 262 is a metal plate, which helps to improve its structural strength and reduce the risk of deformation damaging the battery cell 21.

[0133] In one embodiment, the first end plate 261 is a plastic plate or an epoxy resin plate, which helps to reduce its own weight and reduce the impact of the weight of the first end plate 261 on the battery pack 100.

[0134] In one embodiment, the second end plate 262 is a plastic plate or an epoxy resin plate, which helps to reduce its own weight and reduce the impact of the weight of the second end plate 262 on the battery pack 100.

[0135] In one embodiment, the battery cell assembly 20 further includes a first protective member 281, which is located between the first end plate 261 and the first busbar 241 and connects the first end plate 261 and the first busbar 241. The first protective member 281 can provide insulation protection, reduce the risk of short circuit between the first end plate 261 and the first busbar 241, and also help reduce the risk of damage to the first busbar 241 by the first end plate 261.

[0136] In one embodiment, the first protective element 281 includes, but is not limited to, any one of foam, plastic sheet or epoxy board.

[0137] In one embodiment, the battery cell assembly 20 further includes a second protective member 282, which is located between the second end plate 262 and the second busbar 242, and connects the second end plate 262 and the second busbar 242. The second protective member 282 can provide insulation protection, reduce the risk of short circuit between the second end plate 262 and the second busbar 242, and also help reduce the risk of damage to the second busbar 242 by the second end plate 262.

[0138] In one embodiment, the second protective element 282 includes, but is not limited to, any one of foam, plastic sheet or epoxy board.

[0139] like Figure 2 As shown, in one embodiment, the battery pack 100 further includes an adhesive member 40, at least a portion of which is located within the receiving cavity 17 and connects the outer casing 10 and the cell assembly 20. By providing the adhesive member 40, the stability of the connection between the cell assembly 20 and the outer casing 10 is improved, the shock resistance of the battery pack 100 is enhanced, and the number of accessories used to connect the cell assembly 20 and the outer casing 10 is reduced, thus saving on the manufacturing cost of the battery pack 100.

[0140] In one embodiment, the adhesive 40 is formed by filling the receiving cavity 17 with adhesive and then curing it, which helps to further improve the stability of the connection between the cell assembly 20 and the housing 10 and improve the shock resistance of the battery pack 100.

[0141] In summary, in the battery pack 100 of this application, some of the cells 21 of the cell assembly 20 are stacked along the first direction X, and in two adjacent cells 21 along the first direction X, the protrusion 21121 on the first end cap 2112 of one cell 21 is disposed in the recess 21131 of the second end cap 2113 of the other cell 21 and they are connected to each other. This helps to reduce the number of accessories used to fix the cell assembly 20 in the battery pack 100, save the manufacturing cost of the battery pack 100, and also helps to reduce the weight of the battery pack 100.

[0142] like Figure 12 As shown, embodiments of this application also provide an electrical device 200, including the battery pack 100 of any of the foregoing embodiments.

[0143] In the aforementioned electrical device 200, some of the battery cells 21 in the battery pack 100 are stacked along the first direction X. In two adjacent battery cells 21 along the first direction X, the protrusion 21121 on the first end cap 2112 of one battery cell 21 is located in the recess 21131 of the second end cap 2113 of the other battery cell 21 and they are connected to each other. This helps to reduce the number of accessories used to fix the battery cell assembly 20 in the battery pack 100, save the manufacturing cost of the battery pack 100, reduce the impact of the cost of the battery pack 100 on the electrical device 200, and also helps to reduce the weight of the battery pack 100, thus reducing the impact of the weight of the battery pack 100 on the electrical device 200.

[0144] In one embodiment, the battery pack 100 is capable of providing electrical power to the electrical device 200.

[0145] In one embodiment, the electrical equipment 200 includes, but is not limited to, any one of a drone, an electric two-wheeler, a power tool, and a robot.

[0146] In addition, those skilled in the art may make other changes within the spirit of this application. Of course, all such changes made in accordance with the spirit of this application should be included within the scope disclosed in this application.

Claims

1. A battery pack, characterized by, The battery pack comprises a shell and an electric cell assembly arranged in the shell, the electric cell assembly comprises a plurality of electric cells arranged in a first direction; The electric cell comprises a shell and an electrode assembly arranged in the shell, the shell comprises a main body, a first end cover and a second end cover, the first end cover and the second end cover are respectively arranged at two ends of the main body in the first direction and are connected to the main body, the first end cover is provided with a protrusion, the second end cover is provided with a recess, and the protrusion and the recess are electrically connected to the electrode assembly; In two electric cells adjacent in the first direction, the protrusion of one of the electric cells is arranged in the recess of the other electric cell, and the protrusion and the recess are connected to each other; The protrusion is provided with a plurality of elastic sheet portions, and the elastic sheet portions are arranged around the center of the protrusion in the first direction, and adjacent two elastic sheet portions are separated; At least part of the elastic sheet portion is arranged in the recess and connected to the recess; The protrusion is further provided with a flange, the flange is arranged on the surface of the elastic sheet portion, and the flange is arranged around the elastic sheet portion in the first direction; the recess is provided with a groove, and the groove is recessed from the inside of the recess; at least part of the flange is arranged in the groove; The electric cell assembly further comprises a sampling piece, the sampling piece is arranged between two adjacent electric cells in the first direction and is connected to the first end cover and / or the second end cover; the sampling piece is provided with a first through hole, and the protrusion passes through the first through hole.

2. The battery pack of claim 1, wherein The first end cover comprises a plurality of protrusions, and the protrusions are arranged around the center of the first end cover at equal intervals; The second end cover comprises a plurality of recesses, and the recesses are arranged around the center of the second end cover at equal intervals; In two electric cells adjacent in the first direction, any one of the protrusions of one of the electric cells is arranged in one of the recesses of the other electric cell.

3. The battery pack of claim 1, wherein The electric cell assembly comprises a first electric cell and a second electric cell, the first electric cell is arranged at the end of the electric cell assembly in the opposite direction of the first direction, and the second electric cell is arranged at the end of the electric cell assembly in the first direction; The electric cell assembly further comprises: A first busbar arranged on the side of the first electric cell away from the second electric cell and connected to the first end cover of the first electric cell; A second busbar arranged on the side of the second electric cell away from the first electric cell and connected to the second end cover of the second electric cell.

4. The battery pack of claim 3, wherein The first busbar is provided with a second through hole, and the second busbar is provided with a third through hole; The first end cover is provided with a first fixing hole, and the second end cover is provided with a second fixing hole; The electric cell assembly further comprises: A first connecting piece, part of the first connecting piece passes through the second through hole and is connected to the first fixing hole; A second connecting piece, part of the second connecting piece passes through the third through hole and is connected to the second fixing hole.

5. The battery pack of claim 3, wherein, The first busbar is provided with a fourth through hole, and the protrusion on the first battery cell passes through the fourth through hole.

6. The battery pack of claim 3, wherein, The battery cell assembly further comprises: a first end plate arranged on a side of the first busbar away from the first battery cell and connected to the first busbar; a second end plate arranged on a side of the second busbar away from the second battery cell and connected to the second busbar; a fastening assembly connected to the first end plate and the second end plate.

7. An electric device, characterized by A battery pack comprising any one of the battery cell assemblies as claimed in any one of claims 1 to 6.

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