Battery assembly and electrical equipment

Abstract

A battery assembly and an electrical device having the battery assembly. The battery assembly includes a housing, a battery cell assembly, and a first member. The battery cell assembly is disposed within the housing. The battery cell assembly includes a plurality of battery cells stacked along a first direction. Each battery cell includes a housing, an electrode assembly, and an electrode terminal. The housing includes a first portion for receiving the electrode assembly and a second portion extending from the periphery of the first portion. The electrode terminal is connected to the electrode assembly and extends out of the first portion from the second portion. The first member includes an insulating material. The first member is connected to the housing. Along the first direction, the first member is disposed between the second portions of adjacent battery cells, such that the first member presses against the first portion of the housing of the battery cell. When the battery assembly is impacted, the force received by the battery cell can be transmitted to the housing through the first member, reducing the impact force received by the housing of the battery cell and enhancing the protection of the housing.

Description

Technical Field

[0001] The present application relates to the field of electrochemical devices, and particularly to a battery assembly and an electrical device having the battery assembly. Background Art

[0002] During the use of a battery assembly with multiple battery cells, affected by a complex use environment, the battery assembly is prone to being impacted, vibrated, or shocked, etc. At this time, the electrolyte in the battery cell will impact the battery cell housing under the action of inertia. It is necessary to further improve the protection of the battery cell housing. Summary of the Invention

[0003] In view of the above situation, the present application provides a battery assembly and an electrical device having the battery assembly that can improve the above problems.

[0004] The battery assembly provided by an embodiment of the present application includes a housing, a battery cell assembly, and a first member. The battery cell assembly is disposed in the housing. The battery cell assembly includes a plurality of battery cells stacked along a first direction. Each battery cell includes a housing, an electrode assembly, and an electrode terminal. The housing includes a first part for accommodating the electrode assembly and a second part extending from the periphery of the first part. The electrode terminal is connected to the electrode assembly and extends out of the first part from the second part. The first member includes an insulating material. Along the first direction, the first member is disposed between the second parts of adjacent battery cells. The technical effects included in the embodiment of the present application are as follows: By disposing the first member between the second parts of adjacent battery cells along the first direction, the first member presses against the first part of the housing of the battery cell. When the battery assembly is impacted, the force received by the battery cell can be transmitted to the housing through the first member, reducing the impact force received by the housing of the battery cell and improving the protection of the housing.

[0005] In some embodiments, the first member includes a first structural member and a second structural member, and the first structural member and the second structural member are detachably connected. The technical effects included in some embodiments of the present application are as follows: Using the first structural member and the second structural member to form the first member by splicing reduces the installation difficulty of the first member and improves production efficiency.

[0006] In some embodiments, the first structural member and the second structural member are inserted and connected in a second direction perpendicular to the first direction. The technical effects included in some embodiments of the present application are as follows: Simplifying the connection structure between the first structural member and the second structural member.

[0007] In some embodiments, the first structural member includes a plurality of first blocks and a plurality of second blocks, and along the first direction, the plurality of first blocks and the plurality of second blocks are alternately arranged. The second structural member includes a plurality of third blocks and a plurality of fourth blocks, and along the first direction, the plurality of third blocks and the plurality of fourth blocks are alternately arranged. The third block is detachably connected to the second block, and the fourth block is detachably connected to the first block. The technical effects included in some embodiments of the present application: different blocks of the first structural member and the second structural member are alternately connected to improve the connection strength between the first structural member and the second structural member.

[0008] In some embodiments, each of the first blocks has a first block protrusion at one end facing the second structural member, each of the fourth blocks has a second block concave at one end facing the first structural member, and the first block protrusion is plugged into the second block concave. Technical effects included in some embodiments of the present application: the first block protrusion and the second block concave cooperate with each other, which is conducive to improving the connection reliability between the first structural member and the second structural member.

[0009] In some embodiments, the first block convex portion includes a first section and a second section, the first section is connected between the first block and the second section, the outer surface of the second section is provided with an inclined surface, and the cross-sectional area of ​​the second section gradually decreases along the extension direction of the first block convex portion. The technical effects included in some embodiments of the present application are as follows: when the first block convex portion is plugged into the second block concave portion, the second section is used to guide the moving direction of the first block convex portion, reducing the difficulty of pairing the first block convex portion with the second block concave portion, and allowing the first block convex portion to smoothly enter the second block concave portion.

[0010] In some embodiments, the third block has a third block protrusion at one end facing the first structural member, and the second block has a second block concave at one end facing the second structural member, and the third block protrusion is plugged into the second block concave. Technical effects included in some embodiments of the present application: the third block protrusion cooperates with the second block concave, which is conducive to further improving the connection reliability between the first structural member and the second structural member.

[0011] In some embodiments, the electrode terminal is connected to the electrode assembly and extends from the second portion to the first portion, and the electrode terminals of two adjacent cells are connected to the first block or the third block on a side away from the cell assembly. Technical effects included in some embodiments of the present application: improving the connection reliability between the cell assembly and the first component.

[0012] In some embodiments, along the third direction, the thickness of the second block is greater than the thickness of the first block, the thickness of the fourth block is greater than the thickness of the third block, and the thickness of the electrode terminal is less than or equal to the distance between the upper surface of the first block and the upper surface of the second block. The technical effects included in some embodiments of the present application are: after the battery assembly is assembled, the surface of the electrode terminal does not exceed the surface of the first component, the external dimensions of the battery assembly are reduced, and the energy density is improved.

[0013] In some embodiments, a first connection portion is provided between the adjacent first block and the second block, a first connection recess is provided on the side of the first connection portion facing the battery cell assembly, a second connection portion is provided between the adjacent third block and the fourth block, a second connection recess is provided on the side of the second connection portion facing the battery cell assembly, and along the second direction, the opposite ends of the second portion are respectively provided at the first connection recess and the second connection recess. The technical effects included in some embodiments of the present application: the second connection recess and the second connection recess are used to avoid the second part of the battery cell housing, so that the first component can adapt to the outer structure of the battery cell assembly, and at the same time, the first component and the battery cell assembly can be limited to reduce the relative movement between the first component and the battery cell assembly.

[0014] In some embodiments, a first protrusion is provided on one side of the first connection recess, a second protrusion is provided on one side of the second connection recess, and two opposite sides of the second portion are further provided with bending portions, and the first protrusion and the second protrusion abut against the bending portions. Technical effects included in some embodiments of the present application: reducing the shaking of the second portion in the battery cell to reduce the risk of damage to the shell of the battery cell.

[0015] In some embodiments, along the second direction, a first step surface is provided on the side of the first connection portion facing away from the battery cell assembly, a second step surface is provided on the side of the second connection portion facing away from the battery cell assembly, and first convex portions are further provided inside the opposite sides of the shell, and the first convex portion is abutted and connected to the first step surface and the second step surface. Technical effects included in some embodiments of the present application: the first convex portion of the shell abuts against the first step surface and the second step surface on the first component, which is beneficial for transmitting the force exerted on the battery cell to the shell on the one hand, and can limit the first component on the other hand, reducing the problem of displacement of the first component.

[0016] In some embodiments, along the first direction, the second part has a first concave portion and a second concave portion on opposite sides thereof, the depth of the first concave portion is greater than the depth of the second concave portion, and the bent portion is disposed at the first concave portion. The technical effects included in some embodiments of the present application are as follows: the bent portion is disposed at the deep pit side of the battery cell, which can reduce the situation where the second portion protrudes from the surface of the battery cell, thereby improving the energy density of the battery cell.

[0017] In some embodiments, along the second direction, the housing includes a first side wall and a second side wall that are arranged opposite to each other, a plurality of first side wall recesses are provided on the side of the first side wall facing the battery cell assembly, the sides of the plurality of battery cells are provided on the plurality of first side wall recesses, a first side wall protrusion is provided between adjacent first side wall recesses, a fourth connection recess is provided on the side of the first structural member facing the first side wall, and the first side wall protrusion is provided on the fourth connection recess. Technical effects included in some embodiments of the present application: the first side wall recess and the first side wall protrusion are combined to form a contoured groove for positioning the plurality of battery cells in the battery cell assembly and reducing the shaking of the battery cell assembly in the housing. The fourth connection recess on the first structural member is used to avoid the first side wall protrusion on the housing, and can also play a role in positioning the first structural member.

[0018] In some embodiments, the battery assembly further includes a circuit board, the circuit board is disposed on a side of the first structural member and the second structural member away from the battery cell assembly, the circuit board is electrically connected to the electrode terminals of the battery cell assembly, and the housing includes a second protrusion, the second protrusion is disposed on a side of the circuit board away from the battery cell assembly. The technical effects included in some embodiments of the present application are as follows: the circuit board can be used to detect and control the charging status of the battery cell assembly, the second protrusion cooperates with the circuit board, can not only position the circuit board, but also use the circuit board as another force transmission structure, which is conducive to transmitting the force exerted on the battery cell assembly to the housing.

[0019] In some embodiments, along the first direction, the first structural member has a first end and a second end at opposite ends, respectively, and the second structural member has a third end and a fourth end at opposite ends, respectively, the first end is connected to the third end, and the second end is connected to the fourth end. Technical effects included in some embodiments of the present application: The two ends of the first structural member and the second structural member cooperate with each other, which can further improve the connection strength between the first structural member and the second structural member and maintain the integrity of the first member.

[0020] In some embodiments, the Shore C hardness of the first component is greater than or equal to 70 degrees, so as to facilitate the transmission of the impact force exerted on the battery cell casing to the outer shell.

[0021] An embodiment of the present application further provides a battery assembly, including a housing and a battery cell assembly disposed within the housing. The battery cell assembly includes a plurality of battery cells stacked along a first direction. Each battery cell includes a housing, an electrode assembly, and an electrode terminal. The housing includes a first portion for accommodating the electrode assembly and a second portion extending from the periphery of the first portion. The electrode terminal is connected to the electrode assembly and extends out of the first portion from the second portion. The battery assembly further includes a first member, which includes an insulating material. The first member is connected to the housing and, along the first direction, is disposed between the second portions of adjacent battery cells. The technical effects included in the embodiment of the present application are as follows: By providing a first member connected to the housing and disposing the first member between the second portions of adjacent battery cells along the first direction, the first member presses against the first portion of the housing of the battery cell. When the battery assembly is impacted, the force received by the battery cell can be transmitted to the housing through the first member, reducing the impact force on the housing of the battery cell and enhancing the protection of the housing of the battery cell.

[0022] In some embodiments, the first member includes a first structural member and a second structural member. The housing includes a first shell and a second shell disposed opposite to each other along a second direction. The first structural member is connected to the first shell, and the second structural member is connected to the second shell. Along the second direction, the first structural member and the second structural member are disposed opposite to each other. The technical effects included in some embodiments of the present application are as follows: By connecting the first structural member and the second structural member to the first shell and the second shell respectively, the assembly of the first structural member and the second structural member can be achieved during the assembly of the housing, improving the production efficiency.

[0023] In some embodiments, a first recess is provided at one end of the first structural member facing the second structural member, and a first protrusion is provided at one end of the second structural member facing the first structural member. The first protrusion is disposed within the first recess. The technical effects included in some embodiments of the present application are as follows: The cooperation between the first protrusion and the first recess is beneficial to enhancing the connection reliability between the first structural member and the second structural member.

[0024] In some embodiments, the first protrusion includes a first section and a second section. Along the extending direction of the first protrusion, the cross-sectional area of the first protrusion gradually decreases.

[0025] In some embodiments, a plurality of the first structural members are spaced apart and disposed between the second portions of adjacent battery cells, and the number of the second structural members corresponds to that of the first structural members one by one. The technical effects included in some embodiments of the present application are as follows: By enabling the plurality of first structural members and the plurality of second structural members to be connected in pairs one by one, on the one hand, the strength of the first member can be enhanced, and on the other hand, it is also beneficial to ensure the connection effect of the housing.

[0026] In some embodiments, the battery assembly further includes a first conductive member disposed on a side of the first structural member facing away from the battery cell, and the electrode terminals of two adjacent battery cells are connected to the first conductive member. Technical effects included in some embodiments of the present application: The first conductive member is used to achieve electrical connection between the circuit board or external circuit components and the battery cell. Disposing the first conductive member on the side of the first structural member facing away from the battery cell allows the electrode terminals to be sleeved on the first structural member during connection, realizing the positioning connection between the battery cell assembly and the first member, and reducing the relative displacement between the first member and the battery cell assembly.

[0027] In some embodiments, the battery assembly further includes a first conductive member, and along the first direction, the first conductive member is disposed between adjacent second structural members. Technical effects included in some embodiments of the present application: Both the positive and negative electrode terminals of the battery cell can be connected to the corresponding first conductive member, maintaining the integrity of the circuit of the battery cell assembly.

[0028] In some embodiments, the battery assembly further includes a circuit board, and the first conductive member is electrically connected to the circuit board.

[0029] In some embodiments, a second recess is provided on a side of the first structural member facing away from the battery cell, and the first conductive member is disposed in the second recess. Technical effects included in some embodiments of the present application: It is beneficial to position the first conductive member on the first structural member and reduce the shaking of the first conductive member.

[0030] In some embodiments, the first housing includes a first side wall, the first side wall is provided with a plurality of first recessed portions, a side of the battery cell facing the first housing is disposed in the first recessed portions, a first protruding portion is provided between adjacent first recessed portions, and the first structural member is connected to the first protruding portion. Technical effects included in some embodiments of the present application: It is beneficial to position the first structural member and the first housing.

[0031] In some embodiments, the first structural member includes a first part and a second part, the first part is connected to one of the adjacent first recessed portions, the second part is connected to the other of the adjacent first recessed portions, and along a direction opposite to the second direction, the length of the projection of the first part on the first side wall in the first direction does not exceed the length of the first recessed portion in the first direction, and the length of the projection of the second part on the first side wall in the first direction does not exceed the length of the first recessed portion in the first direction. Technical effects included in some embodiments of the present application: The second part is not connected to the bottommost part of the first recessed portion, which is more convenient for the assembly of the outer shell.

[0032] In some embodiments, the first sidewall includes a first support portion, the circuit board is disposed on the first support portion, the first structural member is connected to the first support portion, and the circuit board and the first structural member are disposed on opposite sides of the first support portion. Technical effects included in some embodiments of the present application: Provide positioning and support effects for the circuit board, and further enhance the connection strength between the first structural member and the first housing.

[0033] In some embodiments, the first housing and the first structural member are an integrally formed structure, and the second housing and the second structural member are an integrally formed structure. Technical effects included in some embodiments of the present application: The integrally formed manner can be injection molding, which can better transmit the impact force received by the battery cell, and at the same time is beneficial to reducing the assembly steps and improving the production efficiency.

[0034] In some embodiments, the first conductive member includes a first section and a second section, the first section is disposed in the second recess, and the first support portion is disposed between the second section and the first recess. Technical effects included in some embodiments of the present application: On the one hand, the support portion can assist in positioning the first conductive member, and on the other hand, it can also support the connection between the first conductive member and the circuit board.

[0035] In some embodiments, the first conductive member further includes a third section connecting the first section and the second section, the third section is inclined relative to the first section, and the first support portion includes a first inclined surface, and the first inclined surface is connected to the first structural member. Technical effects included in some embodiments of the present application: Facilitate the assembly process of the battery assembly.

[0036] In some embodiments, the electrode terminal includes a connecting portion, the connecting portion is connected to the first conductive member, along a third direction, at least a part of the first bump is disposed between the connecting portion and the first part, and the third direction is perpendicular to the first direction and the second direction at the same time. Technical effects included in some embodiments of the present application: It is beneficial to ensure the connection strength between the first structural member and the second structural member, enable the first member to better press the housing of the battery cell, and further protect the housing of the battery cell.

[0037] In some embodiments, at least a part of the first bump is disposed between the connecting portion and the first part, along the second direction, and the length of the part of the first bump disposed between the connecting portion and the first part is greater than 1 / 2 of the length of the connecting portion. Technical effects included in some embodiments of the present application: Further define the dimensional relationship of the first bump inserted into the first recess, so that the first member can effectively hold the housing of the battery cell.

[0038] In some embodiments, the second housing includes a second sidewall provided with a plurality of second recesses. One side of the battery cell facing the second housing is disposed in the second recesses, and second protrusions are provided between adjacent second recesses. The second structural member is connected to the second protrusions.

[0039] In some embodiments, along the second direction, bending portions are respectively provided on opposite sides of the second part, and the first member abuts against the bending portions. Technical effects included in some embodiments of the present application: reduce the shaking of the second part in the battery cell, so as to reduce the problem that the housing of the battery cell is damaged due to the friction of the second part.

[0040] An embodiment of the present application further provides an electrical device, which includes the battery assembly described in the above embodiments. The electrical device includes, but is not limited to, electric vehicles, storage devices, drones, power tools, etc.

[0041] By providing the first member between the second parts of adjacent battery cells, the above battery assembly enables the first member to press against the first part of the housing of the battery cell. When the battery assembly is impacted, the force received by the battery cell can be transmitted to the outer shell through the first member, reducing the impact force received by the housing of the battery cell and enhancing the protection of the housing. Description of the Drawings

[0042] Figure 1 It is a three-dimensional structural schematic diagram of a battery assembly in an embodiment.

[0043] Figure 2 For Figure 1 The exploded structural schematic diagram of the battery assembly shown.

[0044] Figure 3 For Figure 2 The exploded structural schematic diagram of the battery cell in the battery assembly shown.

[0045] Figure 4 For Figure 1 The structural schematic diagram of the battery cell assembly and the first member in the battery assembly shown.

[0046] Figure 5 For Figure 4 The enlarged partial structural diagram of the structure shown.

[0047] Figure 6 For Figure 4 The partial structural exploded diagram of the structure shown.

[0048] Figure 7 For Figure 6 The enlarged partial structural diagram of the structure shown.

[0049] Figure 8 For Figure 2Top view of the first component in the battery assembly shown, and the structures such as the first section, second section, third section, fourth section, etc. in the figure are not fully labeled.

[0050] Figure 9 is Figure 8 Schematic structural diagram of the first component shown before the first structural member and the second structural member are connected.

[0051] Figure 10 is Figure 8 Schematic sectional structure diagram of the first component shown.

[0052] Figure 11 Schematic side view of the first structural member and the second structural member in the second direction B.

[0053] Figure 12 Schematic structural diagram of the battery cell in an embodiment.

[0054] Figure 13 is Figure 12 Front view of the battery cell shown.

[0055] Figure 14 is Figure 12 Side view of the battery cell shown.

[0056] Figure 15 is Figure 1 Schematic structural diagram of the battery cell assembly and the first component in another direction in the battery assembly shown.

[0057] Figure 16 is Figure 15 Partial enlarged view of the structure shown.

[0058] Figure 17 is Figure 15 Side view of the structure shown.

[0059] Figure 18 is Figure 17 Partial enlarged view of the structure shown.

[0060] Figure 19 is Figure 1 Top view of the battery assembly shown.

[0061] Figure 20 is Figure 19 Schematic sectional structure diagram of the battery assembly shown.

[0062] Figure 21 is Figure 20 Partial enlarged view of the structure of the battery assembly shown.

[0063] Figure 22 is Figure 1 Schematic structural diagram of the battery assembly after removing part of the top structure shown.

[0064] Figure 23 is Figure 22 the top view of the structure shown

[0065] Figure 24 is Figure 1 the schematic structural diagram of the battery assembly shown after removing the housing

[0066] Figure 25 is Figure 24 the enlarged view of the partial structure of the structure shown

[0067] Figure 26 is Figure 1 the top view of the battery assembly shown

[0068] Figure 27 is Figure 23 the schematic sectional structural diagram of the battery assembly shown

[0069] Figure 28 is Figure 27 the enlarged view of the partial structure of the structure shown

[0070] Figure 29 is Figure 1 the cross-sectional view of the battery assembly shown after cutting off part of the second side wall of the second housing in the second direction

[0071] Figure 30 is the schematic exploded structural diagram of the battery assembly in one embodiment

[0072] Figure 31 is Figure 30 the side view of the battery assembly shown after removing the harness assembly

[0073] Figure 32 is Figure 31 the schematic sectional structural diagram of the battery assembly shown, and the structure in the dotted circle is the enlarged view of the partial sectional structure

[0074] Figure 33 is Figure 30 the schematic structural diagram of the first housing in the housing of the battery assembly shown

[0075] Figure 34 is Figure 33 the schematic structural diagram of the first housing in another direction shown, and the structure in the dotted circle is the enlarged view of the partial first housing

[0076] Figure 35 is Figure 30 the schematic structural diagram of the second housing in the housing of the battery assembly shown

[0077] Figure 36 is Figure 35Schematic diagram of the structure of the second shell shown in another direction. The structure within the dashed circular frame is an enlarged partial view of the second shell.

[0078] Figure 37 is Figure 30 Schematic diagram of the structure of the battery assembly shown after removing some structures. The structure within the dashed circular frame is an enlarged partial view.

[0079] Figure 38 is Figure 30 Side view of the battery assembly shown after removing the wire harness assembly.

[0080] Figure 39 is Figure 38 Schematic diagram of the sectional structure of the battery assembly shown. The structure within the dashed circular frame is an enlarged partial view of the sectional structure.

[0081] Figure 40 is Figure 38 Schematic diagram of the sectional structure of the battery assembly shown in another direction. The structure within the dashed circular frame is an enlarged partial view of the sectional structure.

[0082] Figure 41 is Figure 30 Schematic diagram of the structure of the battery cell in the battery assembly shown.

[0083] Figure 42 Schematic diagram of the structure before the first shell and the second shell are connected, where the top parts of the first shell and the second shell are removed.

[0084] Figure 43 Schematic diagram of the sectional structure after the first shell and the second shell are connected.

[0085] Figure 44 Schematic diagram of the structure of the electrical device in an embodiment.

[0086] Description of the main component symbols:

[0087] Battery assemblies 100, 100’

[0088] Housings 10, 10’

[0089] First shells 11, 11’

[0090] First side walls 111, 111’

[0091] First side wall recesses 112, 112’

[0092] First side wall protrusions 113, 113’

[0093] First top walls 114

[0094] First bottom walls 115

[0095] First end wall 116

[0096] First opening 1161

[0097] First support part 114’

[0098] Second inclined surface 1141’

[0099] Second end wall 117

[0100] Second shell 12, 12’

[0101] Second side wall 121, 121’

[0102] Second side wall recess 122, 122’

[0103] Second side wall protrusion 123, 123’

[0104] Second top wall 124

[0105] Second bottom wall 125

[0106] Third end wall 126

[0107] Second opening 1261

[0108] Fourth end wall 127

[0109] First protrusion 13

[0110] Second protrusion 14

[0111] Cell assembly 20, 20’

[0112] Cell 21, 21’

[0113] Housing 211, 211’

[0114] First part 2111, 2111’

[0115] Second part 2112, 2112’

[0116] First housing 211a

[0117] Second housing 211b

[0118] First region 211c

[0119] Second region 211d

[0120] Bending part 2113, 2113’

[0121] First recess 2114, 2114’

[0122] Second recess 2115, 2115’

[0123] Electrode assembly 212

[0124] Electrode terminals 213a, 213b

[0125] Connection part 2131’

[0126] Insulating parts 22, 22’

[0127] First members 30, 30’

[0128] First structural members 31, 31’

[0129] First block 311

[0130] Surface 3111

[0131] Second block 312

[0132] First protruding part 3121

[0133] First block protrusions 313, 321’

[0134] First section 3131, 3211’

[0135] Second section 3132, 3212’

[0136] Inclined surface 3133

[0137] Second block recesses 314, 311’

[0138] First sub - part 312’

[0139] Second sub - part 313’

[0140] Fourth recess 314’

[0141] First connection part 315

[0142] First connection recess 3151

[0143] First protruding portion 3152

[0144] First step surface 3153

[0145] Fourth connection recess 316

[0146] First end 317

[0147] First inclined surface 3171

[0148] Second end 318

[0149] Second structural members 32, 32’

[0150] The third block 321

[0151] The fourth block 322

[0152] The second protruding part 3221

[0153] The fourth block recess 323

[0154] The third block protrusion 324

[0155] The second connecting part 325

[0156] The second connecting recess 3251

[0157] The second protruding portion 3252

[0158] The second step surface 3253

[0159] The sixth connecting recess 326

[0160] The third end 327

[0161] The third recess 3271

[0162] The fourth end 328

[0163] The third sub - part 322’

[0164] The fourth sub - part 323’

[0165] Circuit boards 40, 40’

[0166] Connectors 41, 41’

[0167] The first section 411’

[0168] The second section 412’

[0169] The third section 413’

[0170] Chip 42

[0171] Harness assembly 50

[0172] The first end 51

[0173] The second end 52

[0174] Connector 53

[0175] Electrical equipment 200 Specific implementation manners

[0176] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0177] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. When an element is considered to be "disposed on" another element, it can be directly disposed on the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom" and similar expressions used herein are only for the purpose of illustration and are not used to limit this application.

[0178] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0179] An embodiment of this application provides a battery assembly, including a housing, a battery cell assembly and a first member. The battery cell assembly is disposed in the housing. The battery cell assembly includes a plurality of battery cells stacked along a first direction. Each battery cell includes a housing, an electrode assembly and an electrode terminal. The housing includes a first part for accommodating the electrode assembly and a second part extending from the periphery of the first part. The electrode terminal is connected to the electrode assembly and extends out of the first part from the second part. The first member includes an insulating material. Along the first direction, the first member is disposed between the second parts of adjacent battery cells, and the Shore hardness of the first member is greater than or equal to 70 degrees.

[0180] By disposing a first member with a Shore hardness greater than or equal to 70 degrees between the second parts of adjacent battery cells in the above battery assembly, the first member presses against the first part of the housing of the battery cell. When the battery assembly is impacted, the force received by the battery cell can be transmitted to the housing through the first member, improving the protection of the battery cell housing.

[0181] Some embodiments of this application will be described in detail. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0182] Please refer to Figure 1 and Figure 2 、 Figure 3 and Figure 11, in an embodiment of the present application, the battery assembly 100 includes a housing 10, a battery cell assembly 20, and a first member 30. The battery cell assembly 20 is disposed within the housing 10, and the battery cell assembly 20 includes a plurality of battery cells 21 stacked along a first direction A. The battery cell 21 includes a housing 211, an electrode assembly 212, and electrode terminals 213. The housing 211 includes a first portion 2111 for receiving the electrode assembly 212 and a second portion 2112 extending from the periphery of the first portion 2111. The electrode assembly 212 includes a wound structure formed by winding a positive electrode sheet, a negative electrode sheet, and a separator. Optionally, the housing 211 includes an aluminum plastic film, and the battery cell 21 includes a soft-pack battery cell. Along the first direction A, the battery cell 21 includes a first recess 2114 and a second recess 2115 disposed on opposite sides of the second portion 2112. The first recess 2114 and the second recess 2115 are formed by the first portion 2111 and the second portion 2112. Two of the electrode terminals 213a, 213b are connected to the electrode assembly 212 and extend out of the first portion 2111 from the second portion 2112. The polarities of the two electrode terminals 213a, 213b are opposite, wherein the electrode terminal 213a may be a positive electrode and the electrode terminal 213b may be a negative electrode. The first member 30 includes an insulating material. Optionally, the first member 30 includes a foam, such as an EVA foam, with a vinyl acetate content of 5% to 45%. Optionally, the first member 30 is made of an insulating material. Optionally, the first member 30 is made of an insulating material and a metal material. Along the first direction A, the first member 30 is disposed between the second portions 2112 of adjacent battery cells 21. The Shore hardness C of the first member 30 is greater than or equal to 70 degrees. When the battery assembly 100 is subjected to impact, vibration, or impact, the force received by the battery cell 21 can be transmitted to the housing 10 through the first member 30, reducing the impact force received by the housing 211 at the first recess 2114 and the second recess 2115, and enhancing the protection of the housing 211. Please refer to Figure 2 and Figure 4, the first member 30 includes a first structural member 31 and a second structural member 32, and the first structural member 31 and the second structural member 32 are connected. Optionally, the first structural member 31 and the second structural member 32 are detachably connected. When assembling the battery assembly 100, along a second direction B perpendicular to the first direction A, the first structural member 31 and the second structural member 32 are inserted between the second portions 2112 of adjacent battery cells 21, and the first structural member 31 and the second structural member 32 are spliced to form the first member 30, which can reduce the frictional distance between each part of the first member 30 and the battery cell assembly 20 in the second direction B, thereby reducing the frictional resistance, lowering the installation difficulty of the first member 30 in the battery assembly 100, and improving the production efficiency. The battery cell assembly 20 further includes a plurality of insulating members 22, and one of the insulating members 22 is provided between any adjacent battery cells 21. In the embodiments of the present application, the insulating member 22 includes, but is not limited to, compressible materials such as foam. The insulating member 22 can be used to absorb the expansion volume of the battery cell 21 during charging and discharging.

[0183] Please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 , the first structural member 31 and the second structural member 32 are inserted and connected to each other along the second direction B, the second direction B is perpendicular to the first direction A, and the second direction B can be the width direction of the battery cell 21. The first structural member 31 includes a plurality of first blocks 311 and a plurality of second blocks 312, and along the first direction A, the first blocks 311 and the second blocks 312 are alternately arranged. The second structural member 32 includes a plurality of third blocks 321 and a plurality of fourth blocks 322, and along the first direction A, the fourth blocks 322 and the third blocks 321 are alternately arranged. The first structural member 31 and the second structural member 32 are connected to form the first member 30, the third block 321 and the second block 312 are detachably connected, and the fourth block 322 and the first block 311 are detachably connected.

[0184] Please continue to refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11, one end of each of the first blocks 311 facing the second structural member 32 is provided with a first block convex portion 313, and one end of each of the fourth blocks 322 facing the first structural member 31 is provided with a fourth block concave portion 323 corresponding to the first block convex portion 313. One end of each of the third blocks 321 facing the first structural member 31 is provided with a third block convex portion 324, and one end of each of the second blocks 312 facing the second structural member 32 is provided with a second block concave portion 314 corresponding to the third block convex portion 324. When the first structural member 31 and the second structural member 32 are connected to form the first member 30, the first block convex portion 313 is inserted into the fourth block concave portion 323. The third block convex portion 324 is inserted into the second block concave portion 314. The mutual cooperation between the first block convex portion 313 and the fourth block concave portion 323, and the mutual cooperation between the third block convex portion 324 and the second block concave portion 314 are beneficial to improving the connection reliability between the first structural member 31 and the second structural member 32.

[0185] Further, please refer to again Figures 6 to 11 , the first block convex portion 313 includes a first section 3131 and a second section 3132 connected as a whole. The outer surface of the second section 3132 is provided with an inclined surface 3133, and along the second direction B perpendicular to the first direction A, the cross-sectional area of the second section 3132 gradually decreases. When the first block convex portion 313 is inserted into the fourth block concave portion 323, the second section 3132 can be used to guide the moving direction of the first block convex portion 313, reduce the difficulty of matching the first block convex portion 313 with the fourth block concave portion 323, and is beneficial to inserting the first block convex portion 313 into the fourth block concave portion 323. The structure of the third block convex portion 324 is similar to the structure of the first block convex portion 313, and it is a two-section structure with different cross-sectional dimensions. The structure of the third block convex portion 324 will not be described in detail here.

[0186] Along the first direction A, the opposite ends of the first structural member 31 are respectively provided with a first end portion 317 and a second end portion 318, and the opposite ends of the second structural member 32 are respectively provided with a third end portion 327 and a fourth end portion 328. When the first structural member 31 and the second structural member 32 are inserted and connected to each other, the first end portion 317 is connected to the third end portion 327, and the second end portion 318 is connected to the fourth end portion 328. Through the mutual cooperation of the two ends of the first structural member 31 and the second structural member 32 in the embodiment of the present application, the connection strength between the first structural member 31 and the second structural member 32 can be further improved.

[0187] Along the second direction B, the length of the first end portion 317 is greater than the length of the third end portion 327. A third concave portion 3271 is provided at one end of the third end portion 327 facing the first end portion 317, and one end of the first end portion 317 facing the third end portion 327 is inserted into the third concave portion 3271. A first inclined surface 3171 is further provided on the inner side surface of the first end portion 317, which can be used to guide the moving direction of the first end portion 317 inserted into the third concave portion 3271, and reduce the mating difficulty between the first end portion 317 and the third end portion 327. The structure of the fourth end portion 328 is the same as that of the first end portion 317, and the structure of the second end portion 318 is the same as that of the third end portion 327. When the first structural member 31 is connected to the second structural member 32, the second end portion 318 and the fourth end portion 328 are inserted and connected to each other.

[0188] Please refer to again Figure 4 , Figure 5 , Figure 10 and Figure 11 , the electrode terminals 213 of two adjacent battery cells 21 are connected to each other on the surface 3111 of the first block 311 of the first structural member 31 facing away from the battery cell assembly 20, or the electrode terminals 213 of two adjacent battery cells 21 are connected to each other on one side of the third block 321 of the second structural member 32 facing away from the battery cell assembly 20. Along the third direction C, the thickness D2 of the second block 312 is greater than the thickness D1 of the first block 311, and the thickness D4 of the fourth block 322 is greater than the thickness D3 of the third block 321. The third direction C is perpendicular to both the first direction A and the second direction B at the same time. Along the third direction C, the electrode terminals 213 may not extend beyond the second block 312 and the fourth block 322, which can reduce the external dimension of the battery assembly 100 and improve the energy density.

[0189] Along the first direction A, the first structural member 31 includes a plurality of first protruding portions 3121, which are provided on opposite sides of the first block 311. The first protruding portions 3121 are located at one end of the first block 311 facing away from the second structural member 32, and the first protruding portions 3121 protrude from the upper surface of the first block 311. The first block 311 and the two first protruding portions 3121 form a first space, which can be used to accommodate a connecting member 41 connecting the electrode terminal 213. The connecting member 41 includes, but is not limited to, structures such as a conductive sheet and can be made of a metal material. The second structural member 32 includes a plurality of second protruding portions 3221, which are provided on opposite sides of the third block 321. The second protruding portions 3221 are located at one end of the third block 321 facing away from the first structural member 31, and the second protruding portions 3221 protrude from the upper surface of the third block 321. The third block 321 and the two second protruding portions 3221 form a second space for accommodating the connecting member 41 connecting the electrode terminal 213. One end of the first protruding portion 3121 and the second protruding portion 3221 is connected to the second block 312 or the fourth block 322, and the other end abuts against the mutually connected electrode terminals 213 to achieve the positioning between the electrode terminals 213 and the first member 30.

[0190] Please refer to Figure 3 , Figure 12 , Figure 13 and Figure 14 , the housing 211 of the battery cell 21 includes a first housing 211a and a second housing 211b. The first housing 211a is connected to the second housing 211b, and the first housing 211a and the second housing 211b can be folded along the connection position. Along the first direction A, the first housing 211a and the second housing 211b are overlapped to form the first part 2111 of the housing 211 to cover the electrode assembly 212. A first region 211c extends outward from the periphery of the first housing 211a, and a second region 211d extends outward from the periphery of the second housing 211b. After the first housing 211a and the second housing 211b are folded along the connection position, the first region 211c and the second region 211d are overlapped and hermetically connected to form the second part 2112 of the housing 211. The electrode terminal 213 extends out of the housing 211 from one side of the second part 2112 opposite to the connection position.

[0191] Along the second direction B, bending portions 2113 are respectively provided on opposite sides of the second part 2112. The bending portions 2113 are disposed in the first recess 2114, which helps to reduce the situation where the second part 2112 protrudes from the surface of the battery cell 21 and reduces the risk of damage to the bending portions 2113. In the battery cell assembly 20, between adjacent battery cells 21, the first recess 2114 of one battery cell 21 is disposed opposite to the first recess 2114 of another battery cell 21, or the first recess 2114 of one battery cell 21 is disposed opposite to the second recess 2115 of another battery cell 21. In an embodiment of the present application, the bending portions 2113 may be formed by the first structural member 31 and the second structural member 32 pressing against the two side portions 2112 of the battery cell 21 when the first structural member 31 and the second structural member 32 are inserted and connected to each other. After the first structural member 31 and the second structural member 32 are installed, the bending portions 2113 can be resisted and limited. In other embodiments, the bending portions 2113 may be formed by mechanical pressing before the first structural member 31 and the second structural member 32 are installed, so as to reduce the resistance during the installation process of the first structural member 31 and the second structural member 32 and improve the production efficiency of the battery assembly 100. Optionally, the first structural member 31 and the second structural member 32 are connected to the bending portions 2113 to limit the movement of the bending portions 2113. Optionally, along the third direction C, at least a part of the projection of the bending portion 2113 overlaps with the projection of the first structural member 31 to limit the movement of the bending portion 2113. Optionally, along the third direction C, at least a part of the projection of the bending portion 2113 overlaps with the projection of the second structural member 32 to limit the movement of the bending portion 2113.

[0192] Please refer to Figure 4 、 Figure 5 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 18In the first structural member 31, a first connection portion 315 is provided between the adjacent first block 311 and the second block 312, and the first connection portion 315 includes a first connection recess 3151 provided on a side close to the battery cell assembly 20. A second connection portion 325 is provided between the adjacent third block 321 and the fourth block 322, and the second connection portion 325 includes a second connection recess 3251 provided on a side close to the battery cell assembly 20. Along the second direction B, the opposite ends of the second portion 2112 of the battery cell 21 are respectively provided at the first connection recess 3151 and the second connection recess 3251, so that the first component 30 can adapt to the outer structure of the battery cell assembly 20, and reduce the relative movement between the first component 30 and the battery cell assembly 20.

[0193] Furthermore, a first protrusion 3152 is further provided on one side of the first connection recess 3151, and a second protrusion 3252 is further provided on one side of the second connection recess 3251. When the first structural member 31 and the second structural member 32 are mounted on the battery cell assembly 20, the first protrusion 3152 and the second protrusion 3252 abut against the bending portions 2113 at opposite ends of the second portion 2112 of the battery cell 21, so as to reduce the shaking of the second portion 2112 of the battery cell 21, thereby reducing the risk of damage to the shell 211 of the battery cell 21.

[0194] Along the third direction C, the first connection portion 315 is provided with a first step surface 3153 on the side away from the battery cell assembly 20, and the second connection portion 325 is provided with a second step surface 3253 on the side away from the battery cell assembly 20. The first convex portion 13 is further provided inside the opposite sides of the housing 10, and the first convex portion 13 is connected to the first member 30. Specifically, the first convex portion 13 is abutted and connected to the first step surface 3153 and the second step surface 3253, which is conducive to transmitting the force exerted on the battery cell 21 to the housing 10 through the first member 30 on the one hand, and can limit the first member 30 and the housing 10 on the other hand, reducing the problem of displacement of the first member 30.

[0195] See also Figure 2 , Figure 22 and Figure 23Along the second direction B, the housing 10 includes a first shell 11 and a second shell 12 connected to each other, the first shell 11 includes a first side wall 111, the second shell 12 includes a second side wall 121, and the first side wall 111 and the second side wall 121 are arranged opposite to each other along the second direction B. A plurality of first side wall recesses 112 are provided on the side of the first side wall 111 facing the battery cell assembly 20, and the sides of the plurality of battery cells 21 are arranged on the plurality of first side wall recesses 112. A first side wall protrusion 113 is provided between adjacent first side wall recesses 112, and the first side wall recesses 112 and the first side wall protrusions 113 are combined to form a contoured groove for positioning the plurality of battery cells 21 in the battery cell assembly 20 to reduce the shaking of the battery cell assembly 20 in the housing 10. A plurality of fourth connection recesses 316 are provided on the side of the first structural member 31 facing the first side wall 111, and the first side wall protrusion 113 is provided on the fourth connection recesses 316, and the fourth connection recesses 316 limit the movement of the first structural member 31. A plurality of second side wall recesses 122 are also provided on the side of the second side wall 121 facing the battery cell assembly 20, and the second side wall recesses 122 correspond to the positions of the first side wall recesses 112, and the sides of the plurality of battery cells 21 facing away from the first side wall 111 are provided on the plurality of second side wall recesses 122. A second side wall protrusion 123 is provided between adjacent second side wall recesses 122, and the second side wall recesses 122 and the second side wall protrusion 123 form a contoured groove on the second side wall 121, which cooperates with the contoured groove on the first side wall 111 to clamp and position the battery cell assembly 20, further improving the stability of the battery cell assembly 20 in the housing 10. A plurality of sixth connection recesses 326 are further provided on one side of the second structure member 32 facing the second side wall 121 . The second side wall protrusions 123 are disposed in the sixth connection recesses 326 . The sixth connection recesses 326 can limit the movement of the second structure member 32 .

[0196] See also Figure 2 , Figures 19 to 21 ,and Figures 22 to 29, the battery assembly 100 further includes a circuit board 40. The battery cell assembly 20 is electrically connected to the circuit board 40. A chip 42 including a plurality of electronic circuit components is provided on the circuit board 40, which is used to control the charging and discharging current of the battery cell assembly 20 and monitor the charging and discharging temperature of the battery cell assembly 20. The circuit board 40 is disposed on a side of the first structural member 31 and the second structural member 32 facing away from the battery cell assembly 20. The circuit board 40 is electrically connected to the electrode terminal 213 of the battery cell assembly 20. The housing 10 includes a first convex portion 13, and the first convex portion 13 is disposed on a side of the circuit board 40 close to the battery cell assembly 20. The housing 10 further includes a second convex portion 14, and the second convex portion 14 is disposed on a side of the circuit board 40 facing away from the battery cell assembly 20. The circuit board 40 can be used to detect and control the charging and discharging conditions of the battery cell assembly 20. By cooperating with the first convex portion 13 and the circuit board 40, the circuit board 40 can be used as another force transmission structure, which is beneficial to transmit the force received by the battery cell assembly 20 to the housing 10.

[0197] The first housing 11 further includes a first top wall 114, a first bottom wall 115, a first end wall 116, and a second end wall 117 disposed around the first side wall 111. The second housing 12 further includes a second top wall 124, a second bottom wall 125, a third end wall 126, and a fourth end wall 127 disposed around the second side wall 121. Along the second direction B, the first top wall 114 and the second top wall 124 are disposed opposite to each other and detachably connected, the first bottom wall 115 and the second bottom wall 125 are disposed opposite to each other and detachably connected, the first end wall 116 and the third end wall 126 are disposed opposite to each other and detachably connected, and the second end wall 117 and the fourth end wall 127 are disposed opposite to each other and detachably connected. The first convex portion 13 and the second convex portion 14 are spaced apart along the third direction C on the first side wall 111, and the first convex portion 13 and the second convex portion 14 are spaced apart along the third direction C on the second side wall 121. The outer surfaces of the first side wall 111 and the second side wall 121 are further provided with a plurality of grooves for forming a heat dissipation structure on the surface of the housing 10 of the battery assembly 100, increasing the heat dissipation area of the housing 10, and improving the heat dissipation performance of the battery assembly 100.

[0198] A plurality of connectors 41 are further connected to the circuit board 40, and the plurality of connectors 41 are connected between the battery cell assembly 20 and the circuit board 40. Specifically, a connector 41 is connected to the connection portion of the electrode terminals 213 of adjacent battery cells 21. Please refer to again Figure 4 and Figure 5, each of the connecting members 41 is disposed on the upper surface of the first block 311 or the third block 321, and each of the connecting members 41 is at least partially disposed between adjacent first blocks 311 or between adjacent third blocks 321, thereby reducing the extra space occupied by the connecting members 41 and improving the energy density of the battery assembly 100.

[0199] The battery assembly 100 further includes a wiring harness assembly 50. The first end 51 of the wiring harness assembly 50 is connected to the circuit board 40, and the second end 52 of the wiring harness assembly 50 extends out of the housing 10. Specifically, a first opening 1161 and a second opening 1261 are respectively provided on the first end wall 116 and the third end wall 126 of the housing 10. When the first housing 11 and the second housing 12 are assembled, the first opening 1161 and the second opening 1261 are communicated, and the second end 52 of the wiring harness assembly 50 extends out of the housing 10 from the first opening 1161 and the second opening 1261. A connector 53 is further provided at the second end 52 of the wiring harness assembly 50. The connector 53 is used to connect an external device to implement the charging or discharging process of the battery assembly 100.

[0200] Please refer to Figure 30 and Figure 41 , in another embodiment of the present application, the battery pack in this embodiment is similar to the battery assembly 100 in the foregoing embodiment. In this embodiment, the repeated descriptions of the structures that are the same or similar to those of the battery assembly 100 in the foregoing embodiment will be omitted, and the differences from the foregoing embodiment will be mainly described in this embodiment. The parts that are the same as those of the battery assembly 100 use the same numerical numbers, and the detailed descriptions are omitted. For further distinction, the same numerical numbers are added with a distinguishing symbol '' in this embodiment. The first member 30' is connected to the housing 10'. The Shore hardness C of the first member is greater than or equal to 70 degrees. Along the first direction A, the first member 30' is disposed between the second parts 2112' of the adjacent battery cells 21'. When the battery assembly 100' is impacted, the force received by the battery cell 21' can be transmitted to the housing 10' through the first member 30', transferring the force that impacts the housing 211' of the battery cell 21' to the housing 10', reducing the impact force received by the weak area at the top of the housing 211' of the battery cell 21' and improving the protection of the housing 211'.

[0201] Please continue to refer to Figure 31 Figure 32 , Figure 42 and Figure 43, one end of the first structural member 31' away from the second structural member 32' is connected to the first housing 11', and one end of the second structural member 32' away from the first structural member 31' is connected to the second housing 12'. By connecting the first structural member 31' and the second structural member 32' to the first housing 11' and the second housing 12' respectively, the assembly of the first structural member 31' and the second structural member 32' can be achieved when the first housing 11' and the second housing 12' are assembled to form the outer housing 10'. Please refer to again Figure 30 , the battery cell assembly 20' further includes a plurality of insulating members 22', and one of the insulating members 22' is provided between any adjacent battery cells 21'. In the embodiments of the present application, the insulating member 22' includes, but is not limited to, compressible materials such as foam. The insulating member 22' can be used to absorb the expansion volume of the battery cell 21' during charging and discharging.

[0202] Please continue to refer to Figure 33 , Figure 34 , Figure 35 and Figure 36 , one end of the first structural member 31' facing the second structural member 32' is provided with a second block recess 311', and one end of the second structural member 32' facing the first structural member 31' is provided with a first block protrusion 321'. When the first structural member 31' and the second structural member 32 are assembled into the first member 30', the first block protrusion 321' is disposed within the second block recess 311'. The cooperation between the first block protrusion 321' and the second block recess 311' is conducive to improving the connection reliability between the first structural member 31' and the second structural member 32, reducing the problem of the separation of the first structural member 31' and the second structural member 32, and maintaining the stability of the first member 30'.

[0203] Please refer to again Figure 35 , the first block protrusion 321' includes a first section 3211' and a second section 3212'. A slope is provided on the second section 3212'. Along the extension direction of the first block protrusion 321', that is, the second direction B, the cross-sectional area of the second section 3212' on the first block protrusion 321' gradually decreases, which is conducive to guiding the moving direction of the first block protrusion 321' and facilitating the insertion of the first block protrusion 321' into the second block recess 311'. In one of the embodiments of the present application, when the first structural member 31' is connected to the second structural member 32, the first section 3211' is in interference fit with the second block recess 311' to improve the connection firmness between the first structural member 31' and the second structural member 32.

[0204] In the embodiment of the present application, along the first direction A, a plurality of the first structural members 31' are arranged between the second portions 2112' of adjacent battery cells 21', and each of the first structural members 31' is arranged between the first recesses 2114' of adjacent battery cells 21'. The number of the second structural members 32' corresponds to the first structural members 31' one by one. When the first structural member 31' and the second structural member 32' are assembled to form the first component 30', the first component 30' presses the bent portion 2113' toward one side of the battery cell assembly 20' to reduce the shaking of the battery cell 21'.

[0205] In other embodiments, a plurality of the first structural members 31' may also be disposed between any adjacent second portions 2112' of the battery cells 21', so that the first recess 2114' and the second recess 2115' of the battery cell 21' are both provided with the first component 30', thereby increasing the pressure of the first component 30' against the top of the first portion 2111' of the battery cell 21', effectively transmitting the force exerted on the battery cell 21', and further protecting the shell 211'.

[0206] Please refer again Figures 33 to 36 The first shell 11' includes a first side wall 111', the first side wall 111' is provided with a plurality of first side wall recesses 112', the side of the battery cell 21' facing the first shell 11 is provided in the first side wall recess 112', a first side wall protrusion 113' is provided between adjacent first side wall recesses 112', and the first structural member 31' is connected to the first side wall protrusion 113'. The first structural member 31' also includes a first sub-portion 312' and a second sub-portion 313', the first sub-portion 312' is connected to one of the adjacent first side wall recesses 112', and the second sub-portion 313' is connected to the other adjacent first side wall recesses 112', thereby increasing the connection area between the first structural member 31' and the first shell 11', so as to improve the connection strength between the first structural member 31' and the first shell 11'. Along the direction opposite to the second direction B, the length of the projection of the first division 312' on the first side wall 111' in the first direction A does not exceed the length of the first side wall recess 112' in the first direction A, the length of the projection of the second division 313' on the first side wall 111' in the first direction A does not exceed the length of the first side wall recess 112' in the first direction A, and the end of the first structural member 31' facing the first shell 11' is not connected to the bottom of the first side wall recess 112', which makes it more convenient to assemble the battery assembly 100'.

[0207] The second housing 12' includes a second side wall 121', and a plurality of second side wall recesses 122' are provided on the second side wall 121'. One side of the battery cell 21' facing the second housing 12' is disposed in the second side wall recesses 122'. Second side wall protrusions 123' are provided between adjacent second side wall recesses 122', and the second structural member 32' is connected to the second side wall protrusions 123'. The second structural member 32' further includes a third branch 322' and a fourth branch 323'. The third branch 322' is connected to one of the adjacent second side wall recesses 122', and the fourth branch 323' is connected to the other of the adjacent second side wall recesses 122', thereby increasing the connection area between the second structural member 32' and the second housing 12' and enhancing the connection strength between the second structural member 32' and the second housing 12'. Along the second direction B, the length of the projection of the third branch 322' on the second side wall 121' in the first direction A does not exceed the length of the second side wall recess 122' in the first direction A, and the length of the projection of the fourth branch 323' on the second side wall 121' in the first direction A does not exceed the length of the second side wall recess 122' in the first direction A. One end of the second structural member 32' facing the second housing 12' is not connected to the bottommost part of the second side wall recess 122', which is more convenient for assembling the battery assembly 100'.

[0208] In one embodiment of the present application, the first housing 11' and the first structural member 31' are an integrally formed structure, and the second housing 12' and the second structural member 32' can also be an integrally formed structure. The integrally formed manner includes, but is not limited to, injection molding, which can enable the first structural member 31' and the second structural member 32' to better transmit the force received by the battery cell 21', and at the same time is also beneficial to reducing the assembly steps of the battery assembly 100' and improving the production efficiency. In other embodiments, the first structural member 31' can be connected to the first housing 11' by other means, such as snap fixation, screw fixation, adhesive fixation, etc. The second structural member 32' can be connected to the second housing 12' by other means, such as snap fixation, screw fixation, adhesive fixation, etc.

[0209] Please refer to Figure 30 and Figure 37, the battery assembly 100' further includes a circuit board 40' and a connector 41'. The connector 41' is disposed on a side of the first structural member 31' away from the battery cell 21'. The electrode terminals 213' of two adjacent battery cells 21' are connected to the connector 41'. The connector 41' is disposed on a side of the first structural member 31' away from the battery cell 21', and the electrode terminal 213' is also connected to the connector 41' on the first structural member 31', realizing the positioning connection between the battery cell assembly 20' and the first member 30', and reducing the relative displacement between the first member 30' and the battery cell assembly 20'. Along the first direction A, the connector 41' is also disposed between adjacent second structural members 32', so that in the battery cell assembly 20', the positive and negative electrode terminals 213' of the battery cell 21' can be connected to the corresponding connectors 41', maintaining the electrical integrity of the battery cell assembly 20'. A plurality of the connectors 41' are also electrically connected to the circuit board 40' to realize the electrical connection between the battery cell assembly 20' and the circuit board 40'. Please refer to Figure 33 and Figure 37 , a fourth recess 314' is provided on a side of the first structural member 31' away from the battery cell 21', and the connector 41' is disposed in the fourth recess 314', which is beneficial to the positioning of the connector 41' on the first structural member 31' and reduces the sway of the connector 41'. The first side wall 111' includes a first support portion 114'. The circuit board 40' is on the first support portion 114', and the first structural member 31' is connected to the first support portion 114'. Along the third direction C, the first structural member 31' and the circuit board 40' are located on opposite sides of the first support portion 114'. The connector 41' includes a first section 411' and a second section 412'. The first section 411' is disposed in the fourth recess 314', and the first support portion 114' is disposed between the second section 412' and the first side wall recess 112'. On the one hand, the first support portion 114' can assist in positioning the connector 41', and on the other hand, the first support portion 114' can also support the connection between the connector 41' and the circuit board 40'.

[0210] Further, the connector 41' further includes a third section 413' connecting the first section 411' and the second section 412'. The third section 413' is inclined relative to the first section 411'. The first support portion 114' includes a second inclined surface 1141', and the second inclined surface 1141' is connected to the first structural member 31', which is convenient for assembling the battery assembly 100'.

[0211] Please refer to Figure 38 、 Figure 39 and Figure 40, the electrode terminal 213' includes a connecting portion 2131', and the connecting portion 2131' is connected to the connecting member 41'. Along the third direction C, at least a part of the first block protrusion 321' is disposed between the connecting portion 2131' and the first part 2111' of the battery cell 21' to improve the connection strength between the first structural member 31' and the second structural member 32', enabling the first member 30' to better press against the housing 211' of the battery cell 21' and enhancing the impact resistance of the housing 211'. In one embodiment of the present application, along the second direction B, the length of the part of the first block protrusion 321' disposed between the connecting portion 2131' and the first part 2111' is greater than 1 / 2 of the length of the connecting portion 2131'. By further defining the dimensional relationship of the insertion of the first block protrusion 321' into the second block recess 311', the first member 30' can effectively hold against the housing 211' of the battery cell 21'.

[0212] Please refer to Figure 44 , an embodiment of the present application further provides an electrical device 200, and the electrical device 200 includes the battery assembly 100 or the battery assembly 100' described in the above embodiment. In the embodiment of the present application, the electrical device 200 includes, but is not limited to, electric vehicles, energy storage devices, drones, power tools, etc.

[0213] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A battery assembly, include: shell; A cell assembly is arranged in the housing, the cell assembly includes a plurality of cells stacked in a first direction, the cell includes a housing, an electrode assembly and an electrode terminal, the housing includes a first portion for accommodating the electrode assembly and a second portion extending from the periphery of the first portion, the electrode terminal is connected to the electrode assembly and extends from the second portion to the first portion; Characterized in that the battery assembly further comprises a first component, the first component comprises an insulating material, the first component is connected to the housing, and along the first direction, the first component is arranged between the second parts of adjacent battery cells; The first component includes a first structural member and a second structural member. Along the second direction, the first structural member is arranged opposite to the second structural member, and the first structural member is provided with a second block recess at one end facing the second structural member, and the second structural member is provided with a first block convex portion or a third block convex portion at one end facing the first structural member, and the first block convex portion or the third block convex portion is arranged in the second block recess; or, the first structural member is provided with a first block convex portion at one end facing the second structural member, and the second structural member is provided with a fourth block recess at one end facing the first structural member, and the first block convex portion is arranged in the fourth block recess.

2. The battery assembly according to claim 1, It is characterized in that The outer shell includes a first shell and a second shell arranged opposite to each other along a second direction, the first structural member is connected to the first shell, and the second structural member is connected to the second shell; the first shell includes a first top wall, a first bottom wall, a first end wall and a second end wall, the second shell includes a second top wall, a second bottom wall, a third end wall and a fourth end wall, the first top wall is arranged opposite to the second top wall and is detachably connected, the first bottom wall is arranged opposite to the second bottom wall and is detachably connected, the first end wall is arranged opposite to the third end wall and is detachably connected, and the second end wall is arranged opposite to the fourth end wall and is detachably connected.

3. The battery assembly according to claim 1, It is characterized in that The first block convex portion includes a first section and a second section. Along the extending direction of the first block convex portion, the cross-sectional area of ​​the first block convex portion gradually decreases.

4. The battery assembly according to claim 1, It is characterized in that Along the first direction, a plurality of the first structural members are spaced apart between the second portions of adjacent battery cells, and the number of the second structural members corresponds one-to-one to the number of the first structural members.

5. The battery assembly according to claim 2, It is characterized in that The battery assembly further includes a connecting member, which is disposed on a side of the first structural member away from the battery cell, and the electrode terminals of two adjacent battery cells are connected to the connecting member.

6. The battery assembly according to claim 4, It is characterized in that The battery assembly further includes a connecting member, and along the first direction, the connecting member is arranged between adjacent second structural members.

7. The battery assembly according to claim 5 or 6, It is characterized in that The battery assembly further includes a circuit board, and the connecting member is electrically connected to the circuit board.

8. The battery assembly according to claim 5, wherein, a fourth recess is provided on a side of the first structural member facing away from the battery cell, and the connecting member is disposed in the fourth recess.

9. The battery assembly according to claim 8, wherein, the first housing includes a first side wall, the first side wall is provided with a plurality of first side wall recesses, one side of the battery cell facing the first housing is disposed in the first side wall recesses, a first side wall protrusion is provided between adjacent first side wall recesses, and the first structural member is connected to the first side wall protrusion.

10. The battery assembly according to claim 9, wherein, the first structural member includes a first branch and a second branch, the first branch is connected to one of the adjacent first side wall recesses, the second branch is connected to the other of the adjacent first side wall recesses, along a direction opposite to the second direction, the length of the projection of the first branch on the first side wall in the first direction does not exceed the length of the first side wall recess in the first direction, and the length of the projection of the second branch on the first side wall in the first direction does not exceed the length of the first side wall recess in the first direction.

11. The battery assembly according to claim 9, wherein, the first side wall includes a first support portion, the circuit board is disposed on the first support portion, the first structural member is connected to the first support portion, and the circuit board and the first structural member are disposed on opposite sides of the first support portion.

12. The battery assembly according to claim 2, wherein, the first housing and the first structural member are an integrally formed structure, and the second housing and the second structural member are an integrally formed structure.

13. The battery assembly according to claim 11, wherein, the connecting member includes a first section and a second section, the first section is disposed in the fourth recess, and the first support portion is disposed between the second section and the first side wall recess.

14. The battery assembly according to claim 13, wherein, the connecting member further includes a third section connecting the first section and the second section, the third section is inclined relative to the first section, and the first support portion includes a second inclined surface, and the second inclined surface is connected to the first structural member.

15. The battery assembly according to claim 5, wherein, the electrode terminal includes a connecting portion, the connecting portion is connected to the connecting member, along a third direction, at least a part of the first block protrusion is disposed between the connecting portion and the first part, and the third direction is perpendicular to both the first direction and the second direction.

16. The battery assembly according to claim 15, wherein, along the second direction, the length of the part of the first block protrusion disposed between the connecting portion and the first part is greater than 1 / 2 of the length of the connecting portion.

17. The battery assembly according to claim 2, wherein, The second housing includes a second sidewall, and a plurality of second sidewall recesses are provided on the second sidewall. One side of the battery cell facing the second housing is disposed in the second sidewall recesses, and second sidewall protrusions are provided between adjacent second sidewall recesses. The second structural member is connected to the second sidewall protrusions.

18. The battery assembly according to claim 1, wherein, along a second direction, bending portions are respectively provided on opposite sides of the second part, and the first member abuts against the bending portions.

19. An electrical device, wherein, the electrical device includes the battery assembly according to any one of claims 1-18.

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