Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell with a first wall, a first electrode terminal arranged on the first wall, an electrode assembly accommodated in the shell, a first adapter and a first insulating piece. The electrode assembly comprises a main body and a first tab connected to the main body. The first adapter connects the first electrode terminal and the first tab. In the thickness direction of the first wall, at least part of the first insulating piece is arranged between the main body and the first wall, and a part of the first tab is located on the side of the first insulating piece away from the main body. In the same plane perpendicular to the thickness direction, the orthographic projection of the first electrode terminal and the orthographic projection of the first insulating piece do not overlap, and in the direction of the main body pointing to the first wall, a part of the first insulating piece protrudes from the first surface of the first electrode terminal close to the main body. The first insulating piece and the first electrode terminal can share part of the space, which is beneficial to improving the space utilization and improving the energy density.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, improving the energy density of individual battery cells is a key research direction. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical appliance, which are beneficial for improving the energy density of the battery cell.

[0005] According to a first aspect of this application, a battery cell is provided, comprising a casing, a first electrode terminal, an electrode assembly, a first adapter, and a first insulating member. The casing includes a first wall. The first electrode terminal is disposed on the first wall. The electrode assembly is housed within the casing, comprising a main body and a first tab connected to the main body, at least a portion of the first tab being located on the side of the main body near the first wall. The first adapter connects the first electrode terminal and the first tab. The first insulating member is housed within the casing, and in the thickness direction of the first wall, at least a portion of the first insulating member is disposed between the main body and the first wall, with a portion of the first tab located on the side of the first insulating member away from the main body. In the same plane perpendicular to the thickness direction, the orthographic projections of the first electrode terminal and the first insulating member do not overlap. Along the direction from the main body to the first wall, a portion of the first insulating member protrudes from a first surface of the first electrode terminal near the main body. In the thickness direction of the first wall, the first electrode terminal and the first insulating member do not overlap, and there is no thickness superposition between the first electrode terminal and the first insulating member. Along the direction from the main body to the first wall, the portion of the first insulating member protruding from the first surface can share part of the space in the thickness direction with the first electrode terminal, which is beneficial to improve space utilization, reduce the extra space occupied by the first insulating member, and thus improve the energy density of the battery cell.

[0006] In some embodiments, in the same plane perpendicular to the thickness direction, the orthographic projections of the first electrode terminal and the first tab do not overlap. Along the direction from the main body to the first wall, the first tab partially protrudes from the first surface. In the thickness direction of the first wall, there is no thickness overlap between the first electrode terminal and the first tab. Along the direction from the main body to the first wall, the portion of the first tab protruding from the first surface can share a portion of the space in the thickness direction with the first electrode terminal, which is beneficial for improving space utilization and thus increasing the energy density of the battery cell.

[0007] In some embodiments, the first wall includes a first wall portion and a second wall portion. In the thickness direction, the first wall portion is closer to the main body portion than the second wall portion, and the first electrode terminal is disposed on the first wall portion. A first recess is formed on the side of the first wall near the main body portion. The first bottom surface of the first recess corresponds to the second wall portion, and the first recess is recessed relative to the second surface of the first wall portion facing the main body portion. In the same plane perpendicular to the thickness direction, the orthographic projection of the first insulating member is located within the orthographic projection of the first recess, and at least a portion of the first insulating member is accommodated in the first recess. The first electrode terminal disposed on the first wall portion can share a portion of the space in the thickness direction with the first recess. The first recess can provide at least a partial accommodating space for the first insulating member, which is beneficial to increasing the space shared by the first insulating member and the first electrode terminal in the thickness direction, further improving space utilization and increasing the energy density of the battery cell.

[0008] In some embodiments, the orthographic projection of the first electrode tab lies within the orthographic projection of the first recess in the same plane perpendicular to the thickness direction. The first recess can provide a receiving space and / or a buffer space for the first electrode tab, reducing the squeezing effect on the first electrode tab and lowering the risk of breakage. It can also increase the distance between the first electrode tab and the first wall in the thickness direction, facilitating the arrangement of a portion of the first adapter between the first electrode tab and the first wall, so that the first adapter is partially received in the first recess, reducing the space occupied by the first adapter.

[0009] In some embodiments, the first tab is partially accommodated in the first recess. Utilizing the first recess to provide partial accommodating space for the first tab increases the space shared by the first tab and the first electrode terminal in the thickness direction, reduces the additional space occupied by the first tab, and helps to improve the space utilization rate and increase the energy density of the battery cell.

[0010] In some embodiments, the first adapter includes a first adapter portion, a second adapter portion, and a third adapter portion. At least a portion of the first adapter portion is disposed between the first electrode terminal and the main body portion and connects to the first electrode terminal. At least a portion of the second adapter portion is located between the first insulating member and the second wall portion and connects to the first tab. The third adapter portion connects the first adapter portion and the second adapter portion. This embodiment of the application can achieve both electrical connection between the first tab and the first electrode terminal through the first adapter portion and spatial sharing of the first insulating member and the first electrode terminal in the thickness direction.

[0011] In some embodiments, the second wall portion has a third surface away from the main body portion, and the first electrode terminal does not extend beyond the third surface in the direction from the main body portion toward the first wall portion. The fact that the first electrode terminal does not extend beyond the third surface reduces the size of the busbar component protruding from the third surface after the first electrode terminal is connected to the busbar component, which is beneficial for improving space utilization and increasing the energy density of the entire battery device.

[0012] In some embodiments, the first insulating member is connected to the second wall portion. This improves the structural stability of the first insulating member, reduces the possibility of the first insulating member shaking or shifting, lowers the risk of the first insulating member pulling on the first electrode tab, and helps improve the connection stability between the first electrode tab and the first adapter, thereby improving the insulation and isolation effect of the first insulating member.

[0013] In some embodiments, the second wall portion includes a first snap-fit ​​portion, and the first insulating member includes a second snap-fit ​​portion, with the first snap-fit ​​portion snapping into the second snap-fit ​​portion. This simplifies the connection method and improves assembly efficiency.

[0014] In some embodiments, the second wall portion includes a first base portion and a first insulating portion connected to each other. The first base portion is located on the side of the first insulating portion away from the electrode assembly. The first insulating portion includes a first snap-fit ​​portion, which is a snap-fit, in the direction from the first wall portion toward the main body portion. The first snap-fit ​​portion protrudes from the fifth surface of the first tab away from the main body portion. The second snap-fit ​​portion is a slot.

[0015] In some embodiments, the battery cell includes a second insulating member that covers the electrode assembly. A portion of the second insulating member is connected to a first insulating member, and another portion of the second insulating member is connected to a first wall portion. The partial connection of the second insulating member to the first insulating member and also to the first wall portion improves the stability of the first insulating member relative to the main body and relative to the first wall, thereby reducing the risk of the first insulating member shaking or shifting and improving the insulation protection effect.

[0016] In some embodiments, the first recess extends to the edge of the first wall on at least one side in the width direction, with the width direction perpendicular to the thickness direction. This facilitates increasing the size of the first recess in the width direction, thereby providing greater accommodating space for the first insulator, the first tab, and / or the first adapter, and reducing the risk of interference.

[0017] In some embodiments, the housing includes two second walls arranged along the width direction of the first wall, the width direction being perpendicular to the thickness direction; at least one second wall includes a wall body and a protrusion, the wall body being connected to the first wall portion, and the protrusion protruding from the wall body along the thickness direction and connecting to the second wall portion. By providing the protrusion, the at least one second wall can not only adapt to the shape of the first wall for direct connection, but also increase the distance between the central region of the second wall and the connection point between the second and first walls, reducing the risk of reduced connection strength or even cracking at the connection point due to the expansion and contraction of the battery cells.

[0018] In some embodiments, the first insulating member includes an insulating body and a first sidewall. A portion of the first electrode tab is located on the side of the insulating body away from the main body. The first sidewall is connected to one side of the insulating body along the width direction of the first wall, the width direction being perpendicular to the thickness direction. At least a portion of the first sidewall protrudes from the first surface in the direction from the main body to the first wall. The fact that at least a portion of the first sidewall protrudes from the first surface and shares a portion of the space in the thickness direction with the first electrode terminal is beneficial for improving space utilization.

[0019] In some embodiments, the first tab includes a folded portion, a bent portion, and a connecting portion. The folded portion is connected to the main body, the connecting portion is located on the side of the first insulator opposite to the main body and connected to the first adapter, and the bent portion connects the folded portion and the connecting portion and bends relative to the folded portion and the connecting portion. In the same plane perpendicular to the thickness direction, the orthographic projection of the end of the connecting portion away from the bent portion lies within the orthographic projection of the first insulator. The first insulator separates the end of the connecting portion away from the bent portion from the main body, which helps to limit the movement of the end of the connecting portion away from the bent portion toward the main body and reduces the risk of short circuit caused by the connecting portion being inserted into the main body.

[0020] In some embodiments, the first insulating member has an opening, and the first electrode tab passes through the opening. The first electrode tab passing through the opening improves the constraint and restriction effect of the first insulating member on the first electrode tab, reducing the risk of a short circuit caused by the insertion of the first electrode tab into the main body.

[0021] In some embodiments, the battery cell includes two electrode assemblies stacked along the width direction of a first wall, the width direction being perpendicular to the thickness direction; in the width direction, at least a portion of a first insulating member is located between the first tabs of the two electrode assemblies. The first insulating member can simultaneously separate a portion of the first tabs of the two electrode assemblies from the main body, reducing the risk of short circuits caused by the insertion of the first tabs of the two electrode assemblies into the main body, and also helps to simplify the internal structure of the battery cell.

[0022] In some embodiments, the housing includes a second wall, and the first and second walls are arranged along the thickness direction; the electrode assembly includes a second tab connected to the main body, at least a portion of which is located on the side of the main body near the second wall, and the second tab and the first tab have opposite polarities; the battery cell includes a second adapter and a second electrode terminal disposed on the second wall, the second adapter connecting the second electrode terminal and the second tab. The first electrode terminal and the second electrode terminal are respectively disposed on the first and second walls, which helps to reduce the risk of short circuits caused by the overlap of the first and second electrode terminals, improves the localized heat concentration phenomenon of the battery cell, and extends its service life.

[0023] In some embodiments, the battery cell includes a third insulating member. At least a portion of the third insulating member is disposed between the main body and the second wall in the thickness direction. A portion of the second electrode tab is located on the side of the third insulating member away from the main body. In the same plane perpendicular to the thickness direction, the orthographic projections of the second electrode terminal and the third insulating member do not overlap. Along the direction from the main body to the second wall, a portion of the third insulating member protrudes from a fourth surface near the main body of the second electrode terminal. There is no thickness overlap between the second electrode terminal and the third insulating member. The portion of the third insulating member protruding from the fourth surface along the direction from the main body to the second wall can share a portion of the space in the thickness direction with the second electrode terminal, which helps improve space utilization, reduces the additional space occupied by the third insulating member, and thus increases the energy density of the battery cell.

[0024] In some embodiments, the housing includes a fourth wall and a fifth wall arranged along the length direction of the first wall, the length direction being perpendicular to the thickness direction. The fourth wall is closer to the first electrode terminal and the second electrode terminal than the fifth wall. Along the length direction, both the first electrode terminal and the second electrode terminal are offset towards the fourth wall, which helps to form a foolproof design and reduces the risk of reverse connection of the positive and negative electrodes of the battery cell.

[0025] In some embodiments, in the direction of gravity, the first tab is located below the first electrode terminal, and the second tab is located below the second electrode terminal, with the thickness direction perpendicular to the direction of gravity. Compared to the first electrode terminal, the first tab is closer to the bottom of the casing; compared to the second electrode terminal, the second tab is closer to the bottom of the casing. The first and second tabs can more easily contact the ionized electrolyte inside the battery cell, and the heat generated by the first and second tabs can be conducted to the casing through the ionized electrolyte, which is beneficial for heat dissipation of the first and second tabs and improves the fast charging capability of the battery cell.

[0026] In some embodiments, the orthographic projections of the first electrode terminal and the second electrode terminal do not overlap in the same plane perpendicular to the thickness direction. The staggered arrangement of the first and second electrode terminals facilitates quick determination of the battery cell's arrangement direction during assembly, improving assembly efficiency and reducing the risk of reversed positive and negative connections in the battery cells.

[0027] In some embodiments, the electrode assembly includes a second tab connected to the main body, at least a portion of which is located on the side of the main body near the first wall, and the second tab and the first tab have opposite polarities. The battery cell includes a second adapter and a second electrode terminal disposed on the first wall, the second adapter connecting the second electrode terminal and the second tab. Both the first electrode terminal and the second electrode terminal are disposed on the first wall, and at least a portion of the first electrode terminal, the second electrode terminal, the first adapter, the second adapter, the first wall, and the first insulating member can share a portion of space in the thickness direction, which is beneficial for compressing the external dimensions of the battery cell and increasing its energy density.

[0028] In some embodiments, the battery cell includes a third insulating member. At least a portion of the third insulating member is disposed between the main body and the first wall in the thickness direction, and a portion of the second electrode tab is located on the side of the third insulating member away from the main body. In the same plane perpendicular to the thickness direction, the orthographic projections of the second electrode terminal and the third insulating member do not overlap. Along the direction from the main body to the first wall, at least a portion of the third insulating member protrudes from a fourth surface of the second electrode terminal near the main body. The third insulating member can separate a portion of the second electrode tab from the main body, reducing the risk of a short circuit caused by the second electrode tab inserting into the main body, thus improving the reliability of the battery cell. There is no thickness overlap between the second electrode terminal and the third insulating member. Along the direction from the main body to the first wall, the portion of the third insulating member protruding from the fourth surface can share a portion of the space in the thickness direction with the second electrode terminal, which helps improve space utilization, reduces the additional space occupied by the third insulating member, and thereby increases the energy density of the battery cell.

[0029] In some embodiments, the first wall includes a first wall portion and two second wall portions. In the thickness direction, the first wall portion is closer to the main body portion than the second wall portions. Both the first electrode terminal and the second electrode terminal are disposed in the first wall portion. Two first recesses are formed on the side of the first wall closest to the main body portion. The first bottom surfaces of the two first recesses correspond to the two second wall portions, and the first recesses are recessed relative to the second surface of the first wall portion facing the main body portion. In the same plane perpendicular to the thickness direction, the orthographic projections of the first insulating member and the third insulating member are respectively located within the orthographic projections of the two first recesses. At least a portion of the first insulating member and at least a portion of the third insulating member are respectively accommodated in the two first recesses. The two first recesses can provide at least partial accommodating space for the first insulating member and the third insulating member, respectively. This is beneficial for increasing the space shared by the first insulating member and the first electrode terminal in the thickness direction, and for increasing the space shared by the third insulating member and the second electrode terminal in the thickness direction, further improving space utilization and increasing the energy density of the battery cell.

[0030] In some embodiments, the housing includes a housing and an end cap, the housing having a housing opening, the end cap closing onto the housing opening, and a first wall serving as the end cap; or, the housing includes a housing and two end caps, the housing having two housing openings, the two end caps respectively closing onto the two housing openings, and the first wall serving as one of the end caps.

[0031] According to a second aspect of this application, a battery device is also provided, which includes a battery cell provided in a portion of the embodiments of the first aspect. The first insulating member of the battery cell can share a portion of the space in the thickness direction with the first electrode terminal of the battery cell, which is beneficial for improving space utilization, increasing the energy density of a single battery cell, and thus increasing the energy density of the entire battery device.

[0032] In some embodiments, the first wall includes a first wall portion and a second wall portion disposed along its own length direction. In the thickness direction, the first wall portion is closer to the main body than the second wall portion. The first electrode terminal is disposed on the first wall portion. The battery device includes a connector and at least one battery cell assembly. The battery cell assembly includes a plurality of battery cells stacked along the width direction of the first wall. The connector is connected to the second wall portion of at least a portion of the battery cells in the battery cell assembly. The length direction, width direction, and thickness direction are all perpendicular to each other. The second wall portion protrudes from the first wall portion in the direction from the main body to the first wall. The embodiments of this application connect the protruding second wall portion of at least a portion of the battery cells by the connector, which is beneficial for connecting at least a portion of the battery cells in the battery cell assembly into a group, improving the stability of the battery cell assembly, and also helps to reduce the risk of interference between the connector and the first electrode terminal or other components (such as a busbar component connected to the first electrode terminal).

[0033] In some embodiments, the housing includes a second wall, with the first and second walls arranged along the thickness direction; the second wall includes a third wall portion and a fourth wall portion arranged along the length direction, with the third wall portion closer to the main body portion than the fourth wall portion in the thickness direction; the electrode assembly includes a second electrode tab with a polarity opposite to that of the first electrode tab, and the battery cell includes a second electrode terminal disposed on the third wall portion, the second electrode terminal being electrically connected to the second electrode tab; in the battery cell assembly, the first walls of at least two battery cells are arranged in opposite directions; a connector is connected to the second wall portion of a portion of the battery cells in the battery cell assembly, and also connected to the fourth wall portion of another portion of the battery cells in the battery cell assembly. When the first walls of some battery cells are oriented in opposite directions, the connector can simultaneously connect the second wall portion and the fourth wall portion of some battery cells, which is beneficial for connecting all the battery cells of the battery cell assembly into a group, thereby improving the stability of the battery cell assembly.

[0034] In some embodiments, connectors are provided on both sides of the battery cell assembly along the thickness direction. Multiple connectors can connect multiple battery cells of the battery cell assembly on both sides of the thickness direction, which helps to strengthen the structure of the battery cell assembly on both sides of the thickness direction and further improves the stability of the battery cell assembly.

[0035] In some embodiments, the battery device includes a plurality of battery cell assemblies stacked along the thickness direction; there are multiple connectors, including a first connector, which is disposed between two adjacent battery cell assemblies and connected to the battery cells of the two battery cell assemblies in the thickness direction. This approach helps to reduce the number of connectors, save space in the battery device, increase the energy density of the battery device, and improve the stability of the multiple battery cell assemblies.

[0036] In some embodiments, the battery device includes a housing and a plurality of battery cell assemblies housed within the housing; multiple connectors are included, among which a second connector is disposed between the housing and the battery cell assemblies adjacent to the housing. The second connector can fill at least a portion of the gap between the housing and the battery cell assemblies, thereby reducing the sway amplitude that the battery cell assemblies may experience under vibration or impact conditions, and improving the stability and reliability of the battery cell assemblies.

[0037] In some embodiments, the housing includes two first beams arranged along the thickness direction; a second connector is connected to the first beams, or the second connector is integrally formed with the first beams. This helps to enhance the connection strength between the battery cell assembly and the housing, and enhances the overall rigidity and stability of the battery device.

[0038] In some embodiments, the housing includes a second wall, and the first and second walls are arranged along the thickness direction; the electrode assembly includes a second tab with a polarity opposite to that of the first tab; the battery cell includes a second electrode terminal disposed on the second wall, the second electrode terminal being electrically connected to the second tab; the battery device includes a plurality of battery cell assemblies arranged along the thickness direction, each battery cell assembly including a plurality of battery cells stacked along the width direction of the first wall; the plurality of battery cell assemblies include adjacent first battery cell assemblies and second battery cell assemblies, all the first electrode terminals and second electrode terminals of the first battery cell assembly facing the second battery cell assembly form a first terminal group, and all the first electrode terminals and second electrode terminals of the second battery cell assembly facing the first battery cell assembly form a second terminal group; in the same plane perpendicular to the thickness direction, the orthographic projections of the first terminal group and the second terminal group do not overlap. The non-overlapping of the first terminal group and the second terminal group along the thickness direction helps reduce the risk of electrode terminals of the first terminal group and the second terminal group colliding under extreme conditions such as vibration and impact, thereby improving the reliability of the battery device.

[0039] According to a second aspect of this application, this application also provides a battery device comprising a battery cell provided in another part of the embodiments of the first aspect.

[0040] According to a third aspect of this application, this application also provides an electrical device that includes a battery device provided in any embodiment, the battery device being used to provide electrical energy. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0043] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0044] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0045] Figure 4 yes Figure 3 The image shows a front view of a single battery cell.

[0046] Figure 5 It is along Figure 4 The sectional view taken from direction AA in the middle.

[0047] Figure 6 yes Figure 5 A magnified view of region B in the middle.

[0048] Figure 7 yes Figure 3 The top view of the battery cell shown.

[0049] Figure 8 It is along Figure 7 A cross-sectional view taken from the CC direction in the middle.

[0050] Figure 9 yes Figure 8 A magnified schematic diagram of region D in the middle.

[0051] Figure 10 This is a cross-sectional view of a battery cell provided in other embodiments of this application.

[0052] Figure 11 yes Figure 10 A magnified schematic diagram of the middle region M.

[0053] Figure 12 yes Figure 10 A magnified schematic diagram of region N in the middle.

[0054] Figure 13 yes Figure 3 The diagram shows the structure of the first insulating component of the battery cell.

[0055] Figure 14 This is a partial structural cross-sectional view of a battery cell provided in some embodiments of this application.

[0056] Figure 15 yes Figure 8 A magnified view of region E in the middle.

[0057] Figure 16 This is a front view of a battery cell provided in other embodiments of this application.

[0058] Figure 17 This is a cross-sectional view of a battery cell provided in some embodiments of this application.

[0059] Figure 18 yes Figure 17 A magnified schematic diagram of the middle region F.

[0060] Figure 19 yes Figure 17 A magnified schematic diagram of the central region G.

[0061] Figure 20 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application.

[0062] Figure 21 This is a partial structural schematic diagram of a battery device provided in other embodiments of this application.

[0063] Figure 22 This is a cross-sectional view of a battery device provided in some embodiments of this application.

[0064] Figure 23 This is a cross-sectional view of a battery device provided in some other embodiments of this application.

[0065] Figure 24 yes Figure 23 A magnified schematic diagram of region H in the middle.

[0066] Figure 25 This is a cross-sectional view of a battery device provided in some embodiments of this application.

[0067] The attached figures are labeled as follows:

[0068] Vehicle 1, controller 3, motor 4;

[0069] Battery device 2, battery cell assembly 7, first battery cell assembly 701, second battery cell assembly 702, connector 8, first connector 801, second connector 802, busbar 901, fourth insulating component 902;

[0070] Box body 5, first beam 501, first box body section 5a, second box body section 5b, and accommodating space 5c;

[0071] Battery cell 6, electrode assembly 10, main body 11, first tab 12, fifth surface 12a, folding part 121, bending part 122, connecting part 123, second tab 13, outer shell 20, housing 21, housing opening 211, end cap 22, first wall 23, first wall portion 231, second base portion 2313, second insulating portion 2314, second surface 2311, second wall portion 232, first base portion 2323, first insulating portion 2324, third surface 2321, first snap-fit ​​portion 2322, first recess 233, first bottom surface 2331, third recess 234, first bending part 235, third base portion 2333 and third insulating portion 2334, third wall 24, third wall Part 241, fifth surface 2411, fourth wall part 242, second recess 243, second bottom surface 2431, second bend 245, fourth wall 25, fifth wall 26, second wall 27, wall body 271, protrusion 272, first electrode terminal 31, first surface 311, second electrode terminal 32, fourth surface 321, first adapter 41, first adapter part 411, second adapter part 412, third adapter part 413, second adapter part 42, first insulating member 51, opening 511, insulating body 512, insulator part 5121, first side wall 513, second snap-fit ​​part 514, second side wall 515, third insulating member 52, pressure relief mechanism 60, second insulating member 70;

[0072] Thickness direction X, length direction Y, width direction Z. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0075] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0076] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "adhesion" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0077] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0078] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0079] In this application, "multiple" means two or more (including two).

[0080] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0081] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0082] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but the embodiments of this application are not limited to this.

[0083] A typical battery cell includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is housed within the housing, and the electrode terminals are located within the housing. The housing encapsulates the electrode assembly and electrolyte components. The electrode assembly includes tabs, which are electrically connected to the electrode terminals via adapters or directly to the electrode terminals. The electrode terminals are used to electrically connect the electrode assembly to external circuitry within the battery cell to enable charging or discharging of the battery cell.

[0084] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0085] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0086] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0087] In some implementations, the separator is positioned between the positive and negative electrodes.

[0088] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0089] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0090] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0091] In some embodiments, the electrode assembly has a stacked structure.

[0092] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0093] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0094] A battery device typically includes a housing for encapsulating one or more individual battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0095] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties. The battery cell assembly can be housed within a housing by fixing the battery module within the housing. As an example, the housing can include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, creating a closed space inside the housing to house the battery cell assembly.

[0096] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0097] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0098] An electrode assembly typically includes a main body, a positive electrode tab, and a negative electrode tab. The main body includes a positive current collector, a positive active material disposed on at least one surface of the positive current collector, a negative current collector, a negative active material disposed on at least one surface of the negative current collector, and a separator. The positive electrode tab is connected to or integrally formed with the positive current collector. The negative electrode tab is connected to or integrally formed with the negative current collector.

[0099] During the production of battery cells, the forming and folding of the tabs can be affected by various factors, such as cooling rate, pressure distribution, and material plasticity. These factors may lead to uneven distribution of the tabs and difficulty in precisely controlling their morphology. Some tabs may deviate from their intended positions and insert into the body, potentially causing short circuits, affecting the reliability and lifespan of the battery cell, and even leading to fires or explosions.

[0100] In related technologies, an insulating component is placed at the base of the electrode tab to constrain the tab and separate the portion of the tab away from its base from the main body. This helps reduce the risk of short circuits caused by the tab being inserted into the main body. However, the insulating component occupies a significant amount of space within the casing, affecting the energy density of the individual battery cells.

[0101] In view of this, this application provides a technical solution in which the electrode terminal and the insulating member do not overlap in the thickness direction of the wall portion where the electrode terminal is located, and a portion of the insulating member extends beyond the surface of the electrode terminal near the main body portion along the direction from the main body portion to the wall portion. In the thickness direction of the wall portion, there is no thickness overlap between the electrode terminal and the insulating member, allowing them to share a portion of the space, which is beneficial for improving space utilization, reducing the additional space occupied by the insulating member, and thus increasing the energy density of the battery cell.

[0102] The technical solutions provided in this application are applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0103] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0104] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0105] Figure 1 This is a structural schematic diagram of a vehicle provided in some embodiments of this application. (Refer to...) Figure 1 Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0106] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0107] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application. (Refer to...) Figure 2The battery device 2 includes a housing 5 and a battery cell 6, with the battery cell 6 housed within the housing 5. The housing 5 provides a space for the battery cell 6 and can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, together defining a space 5c for accommodating the battery cell 6. The second housing portion 5b may be a hollow structure with one open end, while the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b so that the first housing portion 5a and the second housing portion 5b together define the space 5c. Alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one open side, with the open side of the first housing portion 5a overlapping the open side of the second housing portion 5b. Of course, the box 5 formed by the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0108] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0109] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0110] In the battery device 2, there can be multiple battery cells 6, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel configurations. Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 6 is housed within the housing 5. Alternatively, the battery device 2 can also consist of multiple battery cells 6 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 5. The battery device 2 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 6.

[0111] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.

[0112] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. (Refer to...) Figure 3 The battery cell 6 includes an electrode assembly 10 and a housing 20, with the electrode assembly 10 disposed inside the housing 20.

[0113] The outer casing 20 is used to encapsulate the electrode assembly 10 and electrolyte components. The outer casing 20 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0114] In some embodiments, the housing 20 is a hollow structure, with an internal space for accommodating the electrode assembly 10 and the electrolyte. The shape of the housing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 has a cuboid structure, a cuboid housing can be selected.

[0115] The outer casing 20 can be made of various materials, such as metal or plastic. Optionally, the outer casing 20 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. For example, the outer casing 20 can be a steel casing, aluminum casing, plastic casing (such as polypropylene), composite metal casing (such as copper-aluminum composite casing), or aluminum-plastic film, etc.

[0116] As an example, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having a housing opening 211 and the end cap 22 for closing the housing opening 211.

[0117] The housing 21 is a component used to fit the end cap 22 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte, and other components.

[0118] The housing 21 and the end cap 22 can be separate components. For example, a housing opening 211 can be provided on the housing 21, and the end cap 22 can be used to cover the housing opening 211 to form an internal cavity of the battery cell 6.

[0119] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21.

[0120] The end cap 22 can be connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0121] The housing 21 may be open at one end or open at both ends. For example, the housing 21 is open on one side, and the end cap 22 is configured as one housing opening 211 that covers the housing 21. As another example, the housing 21 may also be open on both sides, and two end caps 22 are configured, with the two end caps 22 respectively covering the two housing openings 211 of the housing 21.

[0122] Figure 4 yes Figure 3 The image shows a front view of a single battery cell. Figure 5 It is along Figure 4 The sectional view taken from direction AA in the middle. Figure 6 yes Figure 5An enlarged schematic diagram of region B in the middle. Figure 7 yes Figure 3 The top view of the battery cell shown. Figure 8 It is along Figure 7 A sectional view taken from the CC direction in the middle. Figure 9 yes Figure 8 An enlarged schematic diagram of region D in the middle. Figure 13 yes Figure 3 The diagram shows the structure of the first insulating component of the battery cell. Figure 14 This is a partial structural cross-sectional view of a battery cell provided in some embodiments of this application. Figure 15 yes Figure 8 An enlarged schematic diagram of region E in the middle. Figure 16 This is a front view of a battery cell provided in some other embodiments of this application. Figure 17 This is a cross-sectional view of a battery cell provided in some embodiments of this application. Figure 18 yes Figure 17 A magnified schematic diagram of the middle region F. Figure 19 yes Figure 17 A magnified schematic diagram of the central region G.

[0123] Reference Figures 3 to 19 The battery cell 6 provided in this application embodiment includes an electrode assembly 10, a housing 20, a first electrode terminal 31, a first adapter 41, and a first insulating member 51. The housing 20 includes a first wall 23. The first electrode terminal 31 is disposed on the first wall 23. The electrode assembly 10 is housed within the housing 20 and includes a main body 11 and a first tab 12 connected to the main body 11. At least a portion of the first tab 12 is located on the side of the main body 11 near the first wall 23. The first adapter 41 connects the first electrode terminal 31 and the first tab 12. The first insulating member 51 is housed within the housing 20. In the thickness direction X of the first wall 23, at least a portion of the first insulating member 51 is disposed between the main body 11 and the first wall 23, and a portion of the first tab 12 is located on the side of the first insulating member 51 away from the main body 11. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first electrode terminal 31 and the orthographic projection of the first insulating member 51 do not overlap. Along the direction from the main body 11 to the first wall 23, a portion of the first insulating member 51 protrudes from the first surface 311 of the first electrode terminal 31 near the main body 11.

[0124] The first wall 23 can be a shell wall of the housing 21 or an end cap 22. Optionally, the first wall 23 can be an end cap 22.

[0125] In this embodiment, the thickness direction X of the first wall 23 refers to the thickness direction of the main body of the first wall 23. The thickness direction X of the first wall 23 is parallel to the arrangement direction of the first wall 23 and the electrode assembly 10.

[0126] The first wall 23 is provided with a first electrode lead-out hole, and at least a portion of the first electrode terminal 31 is accommodated in the first electrode lead-out hole.

[0127] In some examples, the first electrode tab 12 is entirely located on the side of the main body 11 near the first wall 23. In other examples, a portion of the first electrode tab 12 is located on the side of the main body 11 near the first wall 23, while another portion of the first electrode tab 12 is embedded within the main body 11.

[0128] The connection methods between the first adapter 41 and the first tab 12, and between the first adapter 41 and the first electrode terminal 31, include, but are not limited to, welding and bonding. Optionally, the first adapter 41 is ultrasonically or laser welded to the first tab 12. The first adapter 41 is ultrasonically or laser welded to the first electrode terminal 31.

[0129] In some examples, the first insulating member 51 is integrally disposed between the main body 11 and the first wall 23 in the thickness direction X of the first wall 23. In other examples, a portion of the first insulating member 51 is disposed between the main body 11 and the first wall 23 in the thickness direction X of the first wall 23, and another portion of the first insulating member 51 protrudes from the main body 11 along the width or length direction of the first wall 23.

[0130] In the thickness direction X of the first wall 23, a portion of the first tab 12 is located on the side of the first insulating member 51 away from the main body 11. In other words, at least a portion of the first insulating member 51 is located between the main body 11 and a portion of the first tab 12. Optionally, the portion of the first tab 12 away from its root is located on the side of the first insulating member 51 away from the main body 11. The first insulating member 51 can restrain the first tab 12, reducing the risk of short circuit caused by the insertion of the first tab 12 into the main body 11, which is beneficial to improving the reliability of the battery cell 6.

[0131] In some examples, the first insulating member 51 does not protrude from the first tab 12 in the direction from the main body 11 to the first wall 23. In other examples, a portion of the first insulating member 51 protrudes from the first tab 12 in the direction from the main body 11 to the first wall 23. The portion of the first insulating member 51 protruding from the first tab 12 can be connected to the first wall 23, which helps to improve the stability of the first insulating member 51.

[0132] Along the direction from the main body 11 to the first wall 23, a portion of the first insulating member 51 protrudes from the first electrode terminal 31 near the first surface 311 of the main body 11. In some examples, only the portion of the first insulating member 51 that protrudes from the first tab 12 protrudes from the first surface 311. In these examples, the first tab 12 does not protrude from the first surface 311 along the direction from the main body 11 to the first wall 23. In other examples, a portion of the first insulating member 51 located between the main body 11 and the first tab 12 protrudes from the first surface 311. In these examples, a portion of the first tab 12 protrudes from the first surface 311 along the direction from the main body 11 to the first wall 23.

[0133] Optionally, the first insulating member 51 and the first electrode terminal 31 may be arranged along the length direction Y of the first wall 23, which is perpendicular to the thickness direction X. In the same plane perpendicular to the length direction Y, the orthographic projections of the first insulating member 51 and the first electrode terminal 31 partially overlap.

[0134] In the thickness direction X of the first wall 23, the first electrode terminal 31 and the first insulating member 51 do not overlap, and there is no thickness overlap between the first electrode terminal 31 and the first insulating member 51. Along the direction from the main body 11 to the first wall 23, the portion of the first insulating member 51 protruding from the first surface 311 can share part of the space in the thickness direction X with the first electrode terminal 31, which is beneficial to improving space utilization, reducing the extra space occupied by the first insulating member 51, and thus improving the energy density of the battery cell 6.

[0135] In some embodiments, refer to Figure 9 In the same plane perpendicular to the thickness direction X, the orthographic projection of the first electrode terminal 31 and the orthographic projection of the first tab 12 do not overlap. Along the direction from the main body 11 to the first wall 23, the first tab 12 partially protrudes from the first surface 311.

[0136] Optionally, the first tab 12 and the first electrode terminal 31 may be arranged along the length direction Y of the first wall 23. In the same plane perpendicular to the length direction Y, the orthographic projections of the first tab 12 and the first electrode terminal 31 partially overlap.

[0137] In the thickness direction X of the first wall 23, the first electrode terminal 31 and the first tab 12 do not overlap, and there is no thickness overlap between the first electrode terminal 31 and the first tab 12. In the direction from the main body 11 to the first wall 23, the portion of the first tab 12 protruding from the first surface 311 can share part of the space in the thickness direction X with the first electrode terminal 31, which is beneficial to improving space utilization and thus improving the energy density of the battery cell 6.

[0138] In some embodiments, refer to Figure 6In the same plane perpendicular to the width direction Z of the first wall 23, the orthographic projection of the first electrode 12 and the orthographic projection of the first insulating member 51 at least partially overlap. The width direction Z, length direction Y, and thickness direction X of the first wall 23 are mutually perpendicular. The first electrode 12 and the first insulating member 51 can share at least part of the space in the thickness direction X, which is beneficial to improving space utilization and thus increasing the energy density of the battery cell 6.

[0139] In some embodiments, refer to Figure 8 and Figure 9 The first wall 23 includes a first wall portion 231 and a second wall portion 232. In the thickness direction X, the first wall portion 231 is closer to the main body portion 11 than the second wall portion 232. The first electrode terminal 31 is disposed in the first wall portion 231. A first recess 233 is formed on the side of the first wall 23 near the main body portion 11. The first bottom surface 2331 of the first recess 233 corresponds to the second wall portion 232. The first recess 233 is recessed relative to the second surface 2311 of the first wall portion 231 facing the main body portion 11. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first insulating member 51 is located within the orthographic projection of the first recess 233, and at least a portion of the first insulating member 51 is accommodated in the first recess 233.

[0140] The first wall 23 also includes a first bend 235, which connects the first wall portion 231 and the second wall portion 232. The first bend 235 is bent relative to the first wall portion 231 and the second wall portion 232.

[0141] Optionally, the first wall portion 231 and the second wall portion 232 are provided along the length direction Y of the first wall 23. The two ends of the first bent portion 235 along the length direction Y are respectively connected to the first wall portion 231 and the second wall portion 232.

[0142] A third recess 234 is formed on the side of the first wall 23 away from the main body 11, and the bottom surface of the third recess 234 corresponds to the first wall 231. The third recess 234 is recessed relative to the surface of the second wall 232 away from the main body 11. A portion of the first electrode terminal 31 is accommodated in the third recess 234. The first electrode terminal 31 and a portion of the first wall 23 (e.g., the first bend 235) share space in the thickness direction X, which is beneficial for improving space utilization.

[0143] Optionally, the first insulating member 51 and the first electrode terminal 31 are arranged along the length direction Y of the first wall 23. In the same plane perpendicular to the length direction Y, the orthographic projection of the first electrode terminal 31 and the orthographic projection of the first recess 233 partially overlap.

[0144] The first wall portion 231 is closer to the main body portion 11 than the second wall portion 232, and a first recess 233 can be formed on the side of the first wall portion 231 closest to the main body portion 11. The first electrode terminal 31 provided on the first wall portion 231 can share a portion of the space in the thickness direction X with the first recess 233. The first recess 233 can provide at least a partial accommodating space for the first insulating member 51, which is beneficial to increasing the space shared by the first insulating member 51 and the first electrode terminal 31 in the thickness direction X, further improving space utilization and increasing the energy density of the battery cell 6.

[0145] In some embodiments, the orthographic projection of the first tab 12 lies within the orthographic projection of the first recess 233 in the same plane perpendicular to the thickness direction X.

[0146] Along the thickness direction X, the first tab 12 does not overlap with the first wall portion 231, and there is no thickness overlap between the first tab 12 and the first wall portion 231. Along the thickness direction X, the first tab 12 overlaps with the first recess 233, which can provide a receiving space and / or a buffer space for the first tab 12, reducing the squeezing effect on the first tab 12 and lowering the risk of breakage of the first tab 12.

[0147] Along the thickness direction X, the first electrode 12 overlaps with the first recess 233, which can also increase the distance between the first electrode 12 and the first wall 23 in the thickness direction X, making it easier to arrange a part of the first adapter 41 between the first electrode 12 and the first wall 23, so that the first adapter 41 is partially accommodated in the first recess 233, reducing the space occupied by the first adapter 41.

[0148] In some embodiments, refer to Figure 9 The first electrode 12 is partially accommodated in the first recess 233.

[0149] In this embodiment, the first recess 233 provides partial accommodating space for the first tab 12, which is beneficial to increase the space shared by the first tab 12 and the first electrode terminal 31 in the thickness direction X, reduce the extra space occupied by the first tab 12, and improve the space ratio and energy density of the battery cell 6.

[0150] In some embodiments, refer to Figure 8 and Figure 9 The first adapter 41 includes a first adapter portion 411, a second adapter portion 412, and a third adapter portion 413. At least a portion of the first adapter portion 411 is disposed between the first electrode terminal 31 and the main body portion 11 and is connected to the first electrode terminal 31. At least a portion of the second adapter portion 412 is located between the first insulating member 51 and the second wall portion 232 and is connected to the first electrode tab 12. The third adapter portion 413 connects the first adapter portion 411 and the second adapter portion 412.

[0151] In some examples, a portion of the first tab 12 is located on the side of the second adapter 412 opposite to the second wall portion 232 and is connected to the second adapter 412. In other examples, a portion of the first tab 12 is located on the side of the second adapter 412 close to the second wall portion 232 and is connected to the second adapter 412.

[0152] The third transition portion 413 is bent relative to the first transition portion 411 and the second transition portion 412. Optionally, the bending trend of the third transition portion 413 is the same as that of the first bending portion 235. The third transition portion 413 is located on the side of the first bending portion 235 near the main body portion 11, the first transition portion 411 is located on the side of the first wall portion 231 near the main body portion 11, and the second transition portion 412 is located on the side of the second wall portion 232 near the main body portion 11. The shape of the first transition member 41 is adapted to the first wall 23, which helps to reduce the gap between them and improve space utilization.

[0153] Optionally, the first electrode terminal 31 and the first tab 12 are disposed along the length direction Y of the first wall 23. The two ends of the third adapter 413 along the length direction Y are respectively connected to the first adapter 411 and the second adapter 412. In the same plane perpendicular to the length direction Y, the orthographic projection of the first adapter 411 and the orthographic projection of the first insulating member 51 at least partially overlap. The first adapter 411 and the first insulating member 51 can share at least a portion of the space in the thickness direction X, which is beneficial to improving space utilization, saving the extra space occupied by the first adapter 411, thereby increasing the energy density of the battery cell 6.

[0154] The second adapter 412 is accommodated in the first recess 233. At least a portion of the first wall 231 protrudes from the surface of the second adapter 412 facing the main body 11 along the direction of the first wall 23 pointing towards the main body 11, so that the first recess 233 also has space for accommodating the first insulator 51 and the first tab 12.

[0155] The embodiments of this application can achieve both electrical connection between the first tab 12 and the first electrode terminal 31 through the first adapter 41, and spatial sharing between the first insulating member 51 and the first electrode terminal 31 in the thickness direction X.

[0156] In some embodiments, the second wall portion 232 has a third surface 2321 that is away from the main body portion 11, and the first electrode terminal 31 does not extend beyond the third surface 2321 in the direction from the main body portion 11 toward the first wall 23.

[0157] In some examples, along the thickness direction X, the surface of the first electrode terminal 31 away from the main body 11 may be flush with the third surface 2321.

[0158] In other examples, a portion of the second wall portion 232 protrudes from the surface of the first electrode terminal 31 away from the body portion 11 in the direction of the body portion 11 pointing toward the first wall 23.

[0159] The first electrode terminal 31 is used to connect to the busbar component. The first electrode terminal 31 does not extend beyond the third surface 2321. After the busbar component is connected to the first electrode terminal 31, the size of the busbar component protruding from the third surface 2321 can be reduced, which is beneficial to improving space utilization and increasing the energy density of the entire battery device.

[0160] In some embodiments, refer to Figure 10 and Figure 11 The first insulating element 51 is connected to the second wall portion 232.

[0161] In some examples, a portion of the first insulating member 51 protrudes from the first tab 12 along the direction from the main body 11 toward the first wall 23, and the portion of the first insulating member 51 protruding from the first tab 12 is connected to the second wall 232.

[0162] In other examples, a portion of the second wall portion 232 protrudes from the first tab 12 along the direction of the first wall 23 toward the main body portion 11, and the portion of the second wall portion 232 protruding from the first tab 12 is connected to the first insulating member 51.

[0163] The connection between the first insulating member 51 and the second wall portion 232 includes, but is not limited to, snap-fitting and bonding.

[0164] The first insulating member 51 is connected to the second wall portion 232. The second wall portion 232 can improve the structural stability of the first insulating member 51, reduce the possibility of the first insulating member 51 shaking or shifting, reduce the risk of the first insulating member 51 pulling the first electrode tab 12, and help improve the connection stability between the first electrode tab 12 and the first adapter 41, and improve the insulation and isolation effect of the first insulating member 51.

[0165] In some embodiments, refer to Figure 11 The second wall portion 232 includes a first snap-fit ​​portion 2322, and the first insulating member 51 includes a second snap-fit ​​portion 514, with the first snap-fit ​​portion 2322 snapped into the second snap-fit ​​portion 514.

[0166] Optionally, one of the first latching part 2322 and the second latching part 514 is a latch and the other is a slot.

[0167] In some examples, the first engaging portion 2322 is a slot, and the first engaging portion 2322 is located on the side of the second wall portion 232 facing the main body portion 11. The second engaging portion 514 is a latch, and at least a portion of the second engaging portion 514 protrudes from the first surface 311. Optionally, in the direction from the main body portion 11 to the first wall 23, at least a portion of the second engaging portion 514 protrudes from the first tab 12 so as to engage with the first engaging portion 2322.

[0168] In other examples, the first latching portion 2322 is a snap-fit, and the second latching portion 514 is a slot. At least a portion of the first latching portion 2322 protrudes from the fifth surface 12a of the first tab 12 away from the main body 11 in the direction of the first wall 23 pointing towards the main body 11, so as to latch onto the second latching portion 514.

[0169] The first insulating member 51 and the second wall portion 232 are connected by the snap-fit ​​of the first snap-fit ​​portion 2322 and the second snap-fit ​​portion 514, which helps to simplify the connection method and improve assembly efficiency.

[0170] In some embodiments, refer to Figure 11 The second wall portion 232 includes a first base portion 2323 and a first insulating portion 2324 that are interconnected. The first base portion 2323 is located on the side of the first insulating portion 2324 away from the electrode assembly 10. The first insulating portion 2324 includes a first snap-fit ​​portion 2322, which is a latch. Along the direction from the first wall portion 23 to the main body portion 11, the first snap-fit ​​portion 2322 protrudes from the fifth surface 12a of the first electrode tab 12 away from the main body portion 11, and the second snap-fit ​​portion 514 is a slot.

[0171] The connection methods between the first base 2323 and the first insulating part 2324 include, but are not limited to, bonding and snap-fitting.

[0172] Optionally, the material of the first base 2323 may include metal, which is beneficial to improving the structural strength of the first wall 23, reducing its deformation risk, and also beneficial to connecting the first wall 23 to other walls of the outer shell 20 by welding, thereby improving the connection strength.

[0173] Optionally, the first insulating portion 2324 may be made of plastic, which is beneficial for insulatingly separating the first base 2323 from other structures within the housing 20.

[0174] Optionally, the second snap-fit ​​portion 514 is provided on the side of the first insulating member 51 near the first wall 23.

[0175] In some embodiments, refer to Figure 11 and Figure 12The battery cell 6 includes a second insulating member 70, which covers the main body 11. A portion of the second insulating member 70 is connected to the first insulating member 51, and another portion of the second insulating member 70 is connected to the first wall portion 231.

[0176] Optionally, the second insulating element 70 includes an insulating film.

[0177] The connection methods between the second insulating member 70 and the first insulating member 51, and between the second insulating member 70 and the first wall portion 231, include, but are not limited to, heat fusion, bonding, etc.

[0178] A portion of the second insulating member 70 near the first wall 23 may be disposed on the outer periphery of the first insulating member 51 and connected to the first insulating member 51. Another portion of the second insulating member 70 near the first wall 23 may be disposed on the outer periphery of the first wall portion 231 and connected to the first wall portion 231.

[0179] Optionally, the first wall portion 231 includes a second base portion 2313 and a second insulating portion 2314, wherein the second base portion 2313 is disposed on the side of the second insulating portion 2314 away from the main body portion 11. A portion of the second insulating member 70 may be connected to the second insulating portion 2314.

[0180] Optionally, the first bent portion 235 includes a third base portion 2353 and a third insulating portion 2354, with the third base portion 2353 disposed on the side of the third insulating portion 2354 away from the main body portion 11. The first base portion 2323, the second base portion 2313, and the third base portion 2353 are integrally formed, as are the first insulating portion 2324, the second insulating portion 2314, and the third insulating portion 2354.

[0181] The second insulating member 70 is partially connected to the first insulating member 51 and partially connected to the first wall portion 231, which helps to improve the stability of the first insulating member 51 relative to the main body portion 11 and the first insulating member 51 relative to the first wall 23, thereby reducing the risk of the first insulating member 51 shaking or shifting and improving the insulation protection effect.

[0182] In some embodiments, refer to Figures 3 to 9 The first recess 233 extends to the edge of the first wall 23 on at least one side in the width direction Z, where the width direction Z is perpendicular to the thickness direction X. This increases the size of the first recess 233 in the width direction Z, thereby providing more space for the first insulator 51, the first tab 12, and / or the first adapter 41, and reducing the risk of interference.

[0183] In some examples, only one side of the first recess 233 extends to the edge of the first wall 23 in the width direction Z, and that side of the first recess 233 is open.

[0184] In other examples, the first recess 233 extends to the two edges of the first wall 23 on both sides in the width direction Z. The first recess 233 penetrates the first wall 23 in the width direction Z.

[0185] In some embodiments, the housing 20 includes two second walls 27 arranged along the width direction Z of the first wall 23, the width direction Z being perpendicular to the thickness direction X. At least one second wall 27 includes a wall body 271 and a protrusion 272, the wall body 271 being connected to the first wall portion 231, and the protrusion 272 protruding from the wall body 271 along the thickness direction X and being connected to the second wall portion 232.

[0186] In some examples, only the first recess 233 extends to the edge of the first wall 23 on one side in the width direction Z, and only one second wall 27 corresponding to this side includes a wall body 271 and a protrusion 272, the wall body 271 and the protrusion 272 being connected to the edge of the first wall portion 231 and the edge of the second wall portion 232 on that side, respectively. Another second wall 27 may be integrally connected to the first wall portion 231.

[0187] In other examples, the first recess 233 extends to the two edges of the first wall 23 on both sides in the width direction Z. Both second walls 27 include a wall body 271 and a protrusion 272. The wall bodies 271 of the two second walls 27 are respectively connected to the two edges of the first wall portion 231 in the width direction Z, and the two protrusions 272 are respectively connected to the two edges of the second wall portion 232 in the width direction Z.

[0188] At least one second wall 27, by providing a protrusion 272, can not only adapt to the shape of the first wall 23 so as to be directly connected to the first wall 23, but also increase the distance between the central region of the second wall 27 and the connection position of the second wall 27 and the first wall 23, reducing the risk of the connection position being weakened or even cracked due to the expansion and contraction of the battery cell 6.

[0189] In some embodiments, refer to Figure 13 The first insulating member 51 includes an insulating body 512 and a first sidewall 513. A portion of the first tab 12 is located on the side of the insulating body 512 away from the main body 11. The first sidewall 513 is connected to the insulating body 512 along the width direction Z of the first wall 23, which is perpendicular to the thickness direction X. At least a portion of the first sidewall 513 protrudes from the first surface 311 in the direction from the main body 11 to the first wall 23.

[0190] The insulating body 512 is located between the main body portion 11 and the first wall 23. Optionally, the insulating body 512 is located between the main body portion 11 and the second wall portion 232.

[0191] In the width direction Z, a portion of the first sidewall 513 may be located between a portion of the first tab 12 and the second wall 27. Interference is unlikely to occur between the first sidewall 513 and the first tab 12.

[0192] Along the direction from the main body 11 to the first wall 23, the first sidewall 513 may protrude entirely from the first surface 311, or only a portion of the first sidewall 513 may protrude from the first surface 311. A portion of the insulating body 512 may protrude from the first surface 311, or the insulating body 512 may not protrude from the first surface 311.

[0193] The portion of the first sidewall 513 that protrudes from the first surface 311 can be connected to the first wall 23, which helps to improve the stability of the first insulating member 51 without interfering with the first tab 12.

[0194] At least a portion of the first sidewall 513 protrudes from the first surface 311, and at least a portion of the first sidewall 513 shares a portion of the space in the thickness direction X with the first electrode terminal 31, which is beneficial to improving space utilization.

[0195] In some embodiments, refer to Figures 11 to 13 The first insulating member 51 includes a second sidewall 515, which is connected to one side of the insulating body 512 along the length direction Y of the first wall 23. The width direction Z, length direction Y, and thickness direction X are all perpendicular to each other. At least a portion of the second sidewall 515 protrudes from the first surface 311 in the direction from the body portion 11 to the first wall 23. At least a portion of the second sidewall 515 shares a portion of the space in the thickness direction X with the first electrode terminal 31, which is beneficial to improving space utilization.

[0196] Optionally, the second snap-fit ​​portion 514 is provided on the second sidewall 515. The first insulating member 51 includes two second sidewalls 515 spaced apart along the length direction Y, and the second snap-fit ​​portion 514 is provided on the second sidewall 515 away from the first wall portion 231.

[0197] A portion of the second insulating member 70 may be connected to at least one of the first sidewall 513 and the second sidewall 515.

[0198] In some embodiments, refer to Figure 6 The first tab 12 includes a folding portion 121, a bending portion 122, and a connecting portion 123. The folding portion 121 is connected to the main body portion 11. The connecting portion 123 is located on the side of the first insulating member 51 opposite to the main body portion 11 and is connected to the first adapter 41. The bending portion 122 connects the folding portion 121 and the connecting portion 123 and bends relative to the folding portion 121 and the connecting portion 123. In the same plane perpendicular to the thickness direction X, the orthographic projection of the end of the connecting portion 123 away from the bending portion 122 lies within the orthographic projection of the first insulating member 51.

[0199] The first tab 12 includes multiple tab layers, and the portions of the multiple tab layers that converge with each other form a convergence portion 121. The convergence portion 121 is located on the side of the first insulating member 51 near the main body portion 11.

[0200] Optionally, the connecting portion 123 is attached to and welded to the first adapter 41. For example, the connecting portion 123 is laser welded to the second adapter 412.

[0201] One end of the bent portion 122 is connected to the gathered portion 121, and the other end is connected to the connecting portion 123. The bent portion 122 extends through or around the first insulating member 51 to the connecting portion 123.

[0202] Optionally, a portion of the bent portion 122 may be located on the side of the first insulating member 51 away from the main body portion 11, or the bent portion 122 may not be located entirely on the side of the first insulating member 51 away from the main body portion 11.

[0203] Along the thickness direction X, the end of the connecting portion 123 away from the bending portion 122 overlaps with the first insulating member 51. The first insulating member 51 separates the end of the connecting portion 123 away from the bending portion 122 from the main body portion 11, which helps to restrict the end of the connecting portion 123 away from the bending portion 122 from moving toward the main body portion 11 and reduces the risk of short circuit caused by the insertion of the connecting portion 123 into the main body portion 11.

[0204] In some embodiments, refer to Figure 6 and Figure 13 The first insulating member 51 has an opening 511, and the first electrode tab 12 passes through the opening 511.

[0205] Optionally, the bend 122 passes through the opening 511, and the bend 122 is partially accommodated in the opening 511. A portion of the bend 122 may be located on the side of the first insulating member 51 opposite to the main body 11, so as to facilitate connection with the connecting portion 123.

[0206] An opening 511 is provided on the insulating body 512. Optionally, the insulating body 512 includes two insulator portions 5121 spaced apart, with the opening 511 located between the two insulator portions 5121. Optionally, the two insulator portions 5121 are spaced apart along the width direction Z of the first wall 23. The opening 511 is located at the middle of the insulating body 512 along the width direction Z.

[0207] The multiple tab layers of the first tab 12 can converge toward the opening 511, forming a converged portion 121 that is triangular in shape. Each insulator portion 5121 gradually tilts away from the main body portion 11 in a direction close to another insulator portion 5121. The two insulator portions 5121 are tilted to avoid the converged portion 121.

[0208] The first tab 12 is inserted through the opening 511, which helps to improve the constraint and restriction effect of the first insulating member 51 on the first tab 12 and reduce the risk of short circuit caused by the insertion of the first tab 12 into the main body 11.

[0209] In some embodiments, refer to Figure 14 The battery cell 6 includes two electrode assemblies 10 stacked along the width direction Z of the first wall 23, which is perpendicular to the thickness direction X. In the width direction Z, a first insulating member 51 is located between the first tabs 12 of the two electrode assemblies 10.

[0210] The first tabs 12 of the two electrode assemblies 10 can be folded toward both sides of the first insulating member 51 in the width direction Z. A portion of the first tabs 12 of the two electrode assemblies 10 are folded from both sides of the first insulating member 51 in the width direction Z to the side of the first insulating member 51 away from the main body 11.

[0211] Optionally, the connecting portions 123 of the first tabs 12 of the two electrode assemblies 10 are folded from both sides of the first insulating member 51 along the width direction Z to the side of the first insulating member 51 away from the main body portion 11. The first insulating member 51 is located between the bent portions 122 of the first tabs 12 of the two electrode assemblies 10.

[0212] The first insulating member 51 is plate-shaped. The first insulating member 51 includes two inclined surfaces, which are inclined towards both sides of the first insulating member 51 along the width direction Z, gradually moving away from the main body 11, so as to avoid the convergence portion 121 of the first electrode tab 12 of the two electrode assemblies 10.

[0213] The first insulating member 51 can simultaneously separate a portion of the first tabs 12 of the two electrode assemblies 10 from the main body 11, reducing the risk of short circuit caused by the insertion of the first tabs 12 of the two electrode assemblies 10 into the main body 11, and also helps to simplify the internal structure of the battery cell 6.

[0214] In some embodiments, refer to Figure 8 and Figure 15 The outer casing 20 includes a third wall 24, and the first wall 23 and the third wall 24 are arranged along the thickness direction X. The electrode assembly 10 includes a second electrode tab 13 connected to the main body portion 11, at least a portion of the second electrode tab 13 being located on the side of the main body portion 11 near the third wall 24, and the second electrode tab 13 and the first electrode tab 12 having opposite polarities. The battery cell 6 includes a second adapter 42 and a second electrode terminal 32 disposed on the third wall 24, the second adapter 42 connecting the second electrode terminal 32 and the second electrode tab 13.

[0215] The third wall 24 can be one of the shell walls of the housing 21, or it can be an end cap 22. Optionally, the third wall 24 can be an end cap 22.

[0216] The third wall 24 is provided with a second electrode lead-out hole, and at least a portion of the second electrode terminal 32 is accommodated in the second electrode lead-out hole.

[0217] One of the first electrode 12 and the second electrode 13 is a positive electrode, and the other is a negative electrode.

[0218] The first electrode terminal 31 and the second electrode terminal 32 are used to connect to an external circuit to output electrical energy from the battery cell 6 to the external circuit or to input electrical energy into the battery cell 6 through the external circuit. Exemplarily, the first electrode terminal 31 and the second electrode terminal 32 are respectively used to connect to different busbar components.

[0219] The connection methods between the second adapter 42 and the second tab 13, and between the second adapter 42 and the second electrode terminal 32, include, but are not limited to, welding and bonding. Optionally, the second adapter 42 is ultrasonically or laser welded to the second tab 13. The second adapter 42 is ultrasonically or laser welded to the second electrode terminal 32.

[0220] The first electrode terminal 31 and the second electrode terminal 32 are respectively disposed on the first wall 23 and the third wall 24, which helps to reduce the risk of short circuit caused by the connection of the first electrode terminal 31 and the second electrode terminal 32, improve the local heat concentration phenomenon of the battery cell 6, and extend its service life.

[0221] In some embodiments, refer to Figure 15 The battery cell 6 includes a third insulating member 52. At least a portion of the third insulating member 52 is disposed between the main body 11 and the third wall 24 in the thickness direction X. A portion of the second electrode tab 13 is located on the side of the third insulating member 52 away from the main body 11. In the same plane perpendicular to the thickness direction X, the orthographic projection of the second electrode terminal 32 and the orthographic projection of the third insulating member 52 do not overlap. Along the direction from the main body 11 to the third wall 24, a portion of the third insulating member 52 protrudes from the fourth surface 321 of the second electrode terminal 32 near the main body 11.

[0222] Optionally, the structure of the third insulating member 52 is similar to that of the first insulating member 51, and will not be described again here. The arrangement between the third insulating member 52, the third wall 24, the second electrode terminal 32, the main body 11, and the second electrode tab 13 is similar to the arrangement between the first insulating member 51, the first wall 23, the first electrode terminal 31, the main body 11, and the first electrode tab 12, and will not be described again here.

[0223] In the thickness direction X, at least a portion of the third insulating member 52 is located between the main body portion 11 and a portion of the second tab 13. Optionally, the portion of the second tab 13 away from its root is located on the side of the third insulating member 52 away from the main body portion 11. The third insulating member 52 can restrain the second tab 13, reducing the risk of short circuit caused by the insertion of the second tab 13 into the main body portion 11, which is beneficial to improving the reliability of the battery cell 6.

[0224] In the thickness direction X, the second electrode terminal 32 and the third insulating member 52 do not overlap, and there is no thickness overlap between them. Along the direction from the main body 11 to the third wall 24, the portion of the third insulating member 52 protruding from the fourth surface 321 can share a portion of the space in the thickness direction X with the second electrode terminal 32. This improves space utilization, reduces the extra space occupied by the third insulating member 52, and thus increases the energy density of the battery cell 6.

[0225] In some embodiments, the orthographic projections of the second electrode terminal 32 and the second electrode tab 13 do not overlap in the same plane perpendicular to the thickness direction X. Along the direction from the main body 11 to the third wall 24, the second electrode tab 13 partially protrudes from the fourth surface 321.

[0226] In the thickness direction X, the second electrode terminal 32 and the second tab 13 do not overlap, and there is no thickness overlap between the second electrode terminal 32 and the second tab 13. Along the direction from the main body 11 to the third wall 24, the portion of the second tab 13 protruding from the fourth surface 321 can share a portion of the space in the thickness direction X with the second electrode terminal 32, which is beneficial to improving space utilization and thus increasing the energy density of the battery cell 6.

[0227] In some embodiments, refer to Figure 15 The third wall 24 includes a third wall portion 241 and a fourth wall portion 242. In the thickness direction X, the third wall portion 241 is closer to the main body portion 11 than the fourth wall portion 242. The second electrode terminal 32 is disposed in the third wall portion 241. A second recess 243 is formed on the side of the third wall 24 near the main body portion 11. The second bottom surface 2431 of the second recess 243 corresponds to the fourth wall portion 242. The second recess 243 is recessed relative to the fifth surface 2411 of the third wall portion 241 facing the main body portion 11. In the same plane perpendicular to the thickness direction X, the orthographic projection of the third insulating member 52 is located within the orthographic projection of the second recess 243, and at least a portion of the third insulating member 52 is accommodated in the second recess 243.

[0228] The third wall 24 also includes a second bend 245, which connects the third wall portion 241 and the fourth wall portion 242. The second bend 245 is bent relative to the third wall portion 241 and the fourth wall portion 242.

[0229] Optionally, the third wall portion 241 and the fourth wall portion 242 are provided along the length direction Y of the first wall 23. The two ends of the second bent portion 245 along the length direction Y are respectively connected to the third wall portion 241 and the fourth wall portion 242.

[0230] The third wall portion 241 is closer to the main body portion 11 than the fourth wall portion 242, and a second recess 243 can be formed on the side of the third wall portion 241 closest to the main body portion 11. The second electrode terminal 32 provided on the third wall portion 241 can share a portion of the space in the thickness direction X with the second recess 243. The second recess 243 can provide at least a partial accommodating space for the third insulating member 52, which is beneficial to increasing the space shared by the third insulating member 52 and the second electrode terminal 32 in the thickness direction X, further improving space utilization and increasing the energy density of the battery cell 6.

[0231] In some embodiments, the orthographic projection of the second tab 13 lies within the orthographic projection of the second recess 243 in the same plane perpendicular to the thickness direction X.

[0232] Along the thickness direction X, the second tab 13 does not overlap with the third wall portion 241, and there is no thickness overlap between the second tab 13 and the third wall portion 241. Along the thickness direction X, the second tab 13 overlaps with the second recess 243, which can provide a receiving space and / or a buffer space for the second tab 13, reducing the squeezing effect on the second tab 13 and lowering the risk of breakage of the second tab 13.

[0233] In some embodiments, the second tab 13 is partially accommodated in the second recess 243.

[0234] In this embodiment, the second recess 243 provides partial accommodating space for the second tab 13, which is beneficial to increase the space shared by the second tab 13 and the second electrode terminal 32 in the thickness direction X, reduce the extra space occupied by the second tab 13, and improve the space ratio and energy density of the battery cell 6.

[0235] In some embodiments, the housing 20 includes a fourth wall 25 and a fifth wall 26 arranged along the length direction Y of the first wall 23, the length direction Y of the first wall 23 being perpendicular to the thickness direction X. The fourth wall 25 is closer to the first electrode terminal 31 and the second electrode terminal 32 than the fifth wall 26.

[0236] Optionally, in the same plane perpendicular to the thickness direction X, the orthographic projections of the first electrode terminal 31 and the second electrode terminal 32 at least partially overlap. For example, the first electrode terminal 31 and the second electrode terminal 32 are disposed opposite each other along the thickness direction X.

[0237] Optionally, the first wall portion 231 and the third wall portion 241 are both connected to the fourth wall portion 25, and the second wall portion 232 and the fourth wall portion 242 are both connected to the fifth wall portion 26.

[0238] Optionally, the first wall 23 and the third wall 24 are arranged symmetrically along the thickness direction X.

[0239] Along the length direction Y, the first electrode terminal 31 and the second electrode terminal 32 are both biased toward the fourth wall 25, which helps to form a foolproof design and reduce the risk of reverse connection of the positive and negative electrodes of the battery cell 6.

[0240] In some embodiments, refer to Figure 8 In the direction of gravity, the first tab 12 is located below the first electrode terminal 31, the second tab 13 is located below the second electrode terminal 32, and the thickness direction X of the first wall 23 is perpendicular to the direction of gravity.

[0241] The length direction Y of the first wall 23 is parallel to the direction of gravity, and the fourth wall 25 is located above the fifth wall 26. The fourth wall 25 can be the top wall of the outer shell 20, and the fifth wall 26 can be the bottom wall of the outer shell 20.

[0242] Optionally, compared to the fourth wall 25, the first tab 12 and the second tab 13 are both closer to the fifth wall 26, which is beneficial to further reduce the position of the first tab 12 and the second tab 13 relative to the outer shell 20.

[0243] Compared to the first electrode terminal 31, the first tab 12 is closer to the bottom of the outer casing 20; compared to the second electrode terminal 32, the second tab 13 is closer to the bottom of the outer casing 20. The first tab 12 and the second tab 13 can more easily contact the ionized electrolyte inside the battery cell 6. The heat generated by the first tab 12 and the second tab 13 can be conducted to the outer casing 20 through the ionized electrolyte, which is beneficial for the heat dissipation of the first tab 12 and the second tab 13 and improves the fast charging capability of the battery cell 6.

[0244] In some embodiments, refer to Figure 8 The battery cell 6 includes a pressure relief mechanism 60, which is located on the housing 20. The pressure relief mechanism 60 is configured to be actuated when the pressure inside the battery cell 6 reaches a set threshold. The high-temperature, high-pressure material inside the battery cell 6 is discharged outward from the actuated part as a discharge.

[0245] Optionally, the pressure relief mechanism 60 includes a weak section that can rupture when the pressure inside the battery cell 6 reaches a set threshold, forming a pressure relief port to release high-temperature and high-pressure substances.

[0246] In some embodiments, the pressure relief mechanism 60 is located on the bottom wall (e.g., the fifth wall 26) of the housing 20 in the direction of gravity. When actuated, the pressure relief mechanism 60 can discharge high-temperature and high-pressure substances downwards, which helps to reduce the harm to personnel caused by high-temperature and high-pressure substances.

[0247] In some embodiments, refer to Figure 16In the same plane perpendicular to the thickness direction X, the orthographic projection of the first electrode terminal 31 and the orthographic projection of the second electrode terminal 32 do not overlap.

[0248] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are completely offset along the length Y direction of the first wall 23. The first electrode terminal 31 is closer to the fourth wall 25 or the fifth wall 26 than the second electrode terminal 32.

[0249] Along the length Y direction of the first wall 23, the arrangement directions of the first wall portion 231 and the second wall portion 232 are opposite to the arrangement directions of the third wall portion 241 and the fourth wall portion 242. For example, the first wall portion 231 is located above the second wall portion 232, and the third wall portion 241 is located below the fourth wall portion 242.

[0250] The first electrode terminal 31 and the second electrode terminal 32 are staggered. During assembly, it is beneficial to quickly determine the arrangement direction of the battery cell 6 by the position of the first electrode terminal 31 and the second electrode terminal 32, thereby improving assembly efficiency and reducing the risk of reverse connection of the positive and negative electrodes of the battery cell 6.

[0251] The first tab 12 is located on one side of the first electrode terminal 31 along the length direction Y, and the second tab 13 is located on one side of the second electrode terminal 32 along the length direction Y. In the same plane perpendicular to the thickness direction X, the orthographic projections of the first tab 12 and the second tab 13 do not overlap. The staggered arrangement of the first tab 12 and the second tab 13 helps to disperse the most heat-generating parts to diagonally opposite positions on the outer casing 20, further reducing heat concentration.

[0252] In some embodiments, refer to Figures 17 to 19 The electrode assembly 10 includes a second tab 13 connected to the main body 11. At least a portion of the second tab 13 is located on the side of the main body 11 near the first wall 23. The second tab 13 and the first tab 12 have opposite polarities. The battery cell 6 includes a second adapter 42 and a second electrode terminal 32 disposed on the first wall 23. The second adapter 42 connects the second electrode terminal 32 and the second tab 13.

[0253] Optionally, the first electrode terminal 31 and the second electrode terminal 32 are arranged along the length direction Y of the first wall 23. The first adapter 41 and the second adapter 42 are symmetrically arranged along the length direction Y.

[0254] The first electrode terminal 31 and the second electrode terminal 32 are both disposed on the first wall 23. At least some of the first electrode terminal 31, the second electrode terminal 32, the first adapter 41, the second adapter 42, the first wall 23, and the first insulating member 51 can share a portion of the space in the thickness direction X, which is beneficial for compressing the external dimensions of the battery cell 6 and increasing the energy density of the battery cell 6.

[0255] In some embodiments, the battery cell 6 includes a third insulating member 52, at least a portion of which is disposed between the main body 11 and the first wall 23 in the thickness direction X. A portion of the second electrode tab 13 is located on the side of the third insulating member 52 away from the main body 11. In the same plane perpendicular to the thickness direction X, the orthographic projections of the second electrode terminal 32 and the third insulating member 52 do not overlap. In the direction from the main body 11 to the first wall 23, at least a portion of the third insulating member 52 extends beyond the second electrode terminal 32 and approaches the fourth surface 321 of the main body 11.

[0256] Optionally, the third insulating member 52 and the first insulating member 51 are symmetrically arranged along the length Y direction of the first wall 23.

[0257] Optionally, the structure of the third insulating member 52 is similar to that of the first insulating member 51, and will not be described again here. The arrangement between the third insulating member 52, the first wall 23, the second electrode terminal 32, the main body 11, and the second electrode tab 13 is similar to the arrangement between the first insulating member 51, the first wall 23, the first electrode terminal 31, the main body 11, and the first electrode tab 12, and will not be described again here.

[0258] The third insulating member 52 can separate a portion of the second tab 13 from the main body 11, reducing the risk of short circuit caused by the insertion of the second tab 13 into the main body 11, which is beneficial to improving the reliability of the battery cell 6.

[0259] In the thickness direction X, the second electrode terminal 32 and the third insulating member 52 do not overlap, and there is no thickness overlap between them. Along the direction from the main body 11 to the first wall 23, the portion of the third insulating member 52 protruding from the fourth surface 321 can share a portion of the space in the thickness direction X with the second electrode terminal 32. This improves space utilization, reduces the additional space occupied by the third insulating member 52, and thus increases the energy density of the battery cell 6.

[0260] Optionally, in the same plane perpendicular to the length direction Y of the first wall 23, the orthographic projections of the first insulating member 51, the third insulating member 52, the first electrode terminal 31, and the second electrode terminal 32 partially overlap. The first insulating member 51, the third insulating member 52, the first electrode terminal 31, and the second electrode terminal 32 can share a portion of the space in the thickness direction X, which is beneficial to further improve space utilization and increase the energy density of the battery cell 6.

[0261] In some embodiments, refer to Figures 17 to 19The first wall 23 includes a first wall portion 231 and two second wall portions 232. In the thickness direction X, the first wall portion 231 is closer to the main body portion 11 than the second wall portions 232. The first electrode terminal 31 and the second electrode terminal 32 are both disposed in the first wall portion 231. Two first recesses 233 are formed on the side of the first wall 23 near the main body portion 11. The first bottom surfaces 2331 of the two first recesses 233 correspond to the two second wall portions 232 respectively. The first recesses 233 are recessed relative to the second surface 2311 of the first wall portion 231 facing the main body portion 11. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first insulating member 51 and the orthographic projection of the third insulating member 52 are respectively located within the orthographic projections of the two first recesses 233. At least a portion of the first insulating member 51 and at least a portion of the third insulating member 52 are respectively accommodated in the two first recesses 233.

[0262] The two first recesses 233 can provide at least partial accommodating space for the first insulating member 51 and the third insulating member 52 respectively, which is beneficial to increase the space shared by the first insulating member 51 and the first electrode terminal 31 in the thickness direction X, and increase the space shared by the third insulating member 52 and the second electrode terminal 32 in the thickness direction X, thereby further improving the space utilization rate and increasing the energy density of the battery cell 6.

[0263] In some embodiments, two second wall portions 232 are symmetrically arranged along the thickness direction X of the first wall 23, and two first recesses 233 are symmetrically arranged. The first insulating member 51, the third insulating member 52, the first electrode terminal 31, and the second electrode terminal 32 can share a portion of the space in the thickness direction X, which is beneficial to further improve space utilization and increase the energy density of the battery cell 6.

[0264] In some embodiments, refer to Figure 17 The outer casing 20 includes a housing 21 and an end cap 22. The housing 21 has a housing opening 211, the end cap 22 closes to the housing opening 211, and the first wall 23 is the end cap 22.

[0265] Optionally, the end cap 22 includes an end cap body and a third insulating member, the third insulating member being disposed on the side of the end cap body near the main body portion 11 and connected to the end cap body. The housing 21 is connected to the end cap body.

[0266] In some embodiments, refer to Figure 3 and Figure 8 The outer casing 20 includes a housing 21 and two end caps 22. The housing 21 has two housing openings 211, and the two end caps 22 respectively cover the two housing openings 211. The first wall 23 is one of the end caps 22. Optionally, the third wall 24 is the other end cap 22.

[0267] This application also provides a battery device 2, which includes a plurality of battery cells 6 provided according to any embodiment of this application.

[0268] The first insulating member 51 of the battery cell 6 can share part of the space in the thickness direction X with the first electrode terminal 31 of the battery cell 6, which is beneficial to improve space utilization, increase the energy density of a single battery cell 6, and thus increase the energy density of the entire battery device 2.

[0269] Figure 20 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application. Figure 21 This is a partial structural schematic diagram of a battery device provided in other embodiments of this application. Figure 22 These are cross-sectional views of a battery device provided in some embodiments of this application. Figure 23 This is a cross-sectional view of a battery device provided in some other embodiments of this application. Figure 24 yes Figure 23 A magnified view of region H in the middle. Figure 25 This is a cross-sectional view of a battery device provided in some embodiments of this application.

[0270] In some embodiments, refer to Figure 2 , Figures 20 to 25 The first wall 23 includes a first wall portion 231 and a second wall portion 232 disposed along its own length direction Y. In the thickness direction X, the first wall portion 231 is closer to the main body portion 11 than the second wall portion 232, and a first electrode terminal 31 is disposed on the first wall portion 231. The battery device 2 includes a connector 8 and at least one battery cell assembly 7, the battery cell assembly 7 including a plurality of battery cells 6 stacked along the width direction Z of the first wall 23. The connector 8 is connected to at least a portion of the second wall portion 232 of the battery cells 6 in the battery cell assembly 7. The length direction Y, width direction Z, and thickness direction X of the first wall 23 are mutually perpendicular.

[0271] As an example, refer to Figure 20 In the battery cell assembly 7, the first walls 23 of each battery cell 6 are arranged in the same direction. In other words, the first walls 23 of each battery cell 6 face the same direction. In these examples, the connector 8 can be connected to the second walls 232 of all battery cells 6 in the battery cell assembly 7. Multiple battery cells 6 in the battery cell assembly 7 can be connected in parallel.

[0272] As another example, see Figure 21 In the battery cell assembly 7, the first walls 23 of at least two battery cells 6 are arranged in opposite directions. In other words, the first walls 23 of at least two battery cells 6 face opposite directions. In these examples, a connector 8 can be connected to the second wall portion 232 of the first walls 23 arranged in the same direction. At least two battery cells 6 in the battery cell assembly 7 can be connected in series.

[0273] Optionally, the battery device 2 includes a housing 5, in which the battery cell assembly 7 is housed. The connector 8 may or may not be connected to the housing 5. For example, the connector 8 may be separate from the housing 5, or may only contact the housing 5.

[0274] The connector 8 is provided on one side of the battery cell assembly 7 along the thickness direction X, so as to connect the second wall portion 232 of the first wall 23.

[0275] Optionally, the connector 8 is plate-shaped. The connector 8 extends along the width direction Z of the first wall 23 to facilitate connection to at least a portion of the second wall portion 232 of the battery cell 6.

[0276] There can be one or more connectors 8.

[0277] When there are multiple battery cell modules 7, the connector 8 can connect only one battery cell module 7 or connect two adjacent battery cell modules 7.

[0278] The connection methods between the connector 8 and the second wall portion 232 include, but are not limited to, bonding and snap-fitting.

[0279] Optionally, connector 8 is an insulating component.

[0280] Along the direction from the main body 11 to the first wall 23, the second wall 232 protrudes from the first wall 231. In this embodiment, the second wall 232 protruding from at least a portion of the battery cells 6 is connected by the connector 8. This facilitates the connection of at least a portion of the battery cells 6 of the battery cell assembly 7 into a group, improving the stability of the battery cell assembly 7. It also helps to reduce the risk of interference between the connector 8 and the first electrode terminal 31 or other components (such as the busbar component connected to the first electrode terminal 31).

[0281] In some embodiments, refer to Figure 21 The outer casing 20 includes a third wall 24, and the first wall 23 and the third wall 24 are arranged along the thickness direction X. The third wall 24 includes a third wall portion 241 and a fourth wall portion 242 disposed along the length direction Y of the first wall 23. In the thickness direction X of the first wall 23, the third wall portion 241 is closer to the main body portion 11 than the fourth wall portion 242. The electrode assembly 10 includes a second electrode tab 13 with the opposite polarity to the first electrode tab 12. The battery cell 6 includes a second electrode terminal 32 disposed on the third wall portion 241, and the second electrode terminal 32 is electrically connected to the second electrode tab 13. In the battery cell assembly 7, the first walls 23 of at least two battery cells 6 are arranged in opposite directions. The connector 8 is connected to the second wall portion 232 of a portion of the battery cells 6 in the battery cell assembly 7, and is also connected to the fourth wall portion 242 of another portion of the battery cells 6 in the battery cell assembly 7.

[0282] In the battery cell assembly 7, the first walls 23 of at least two battery cells 6 face opposite directions. Exemplarily, the first walls 23 of two adjacent battery cells 6 are arranged in opposite directions, while the first wall 23 of one battery cell 6 and the third wall 24 of another battery cell 6 face the same direction. A connector 8 connects a second wall portion 232 facing the same first wall 23 and a fourth wall portion 242 facing the same third wall 24.

[0283] In the first wall 23 and the third wall 24 facing the same direction, the second wall portion 232 and the fourth wall portion 242 at least partially overlap along the width direction Z of the first wall 23 so as to be connected to the connector 8.

[0284] In the first wall 23 and the third wall 24, which face the same direction, the arrangement direction of the first wall portion 231 and the second wall portion 232 is the same as that of the third wall portion 241 and the fourth wall portion 242. For example, the second wall portion 232 and the fourth wall portion 242 are both closer to the fifth wall 26 than the fourth wall 25, so as to be connected to the connector 8.

[0285] In this embodiment, the third wall 24 is configured to include a third wall portion 241 and a fourth wall portion 242, with the fourth wall portion 242 protruding from the third wall portion 241 in a direction away from the main body portion 11. When the first walls 23 of some battery cells 6 face opposite directions, the connector 8 can simultaneously connect the second wall portion 232 and the fourth wall portion 242 of some battery cells 6, which is beneficial for connecting all battery cells 6 of the battery cell assembly 7 into a group and improving the stability of the battery cell assembly 7.

[0286] In some embodiments, refer to Figures 20 to 22 The battery cell assembly 7 has connectors 8 on both sides along the thickness direction X.

[0287] As an example, refer to Figure 20 In the battery cell assembly 7, the first walls 23 of each battery cell 6 are arranged in the same direction. In these examples, the third walls 24 of each battery cell 6 are arranged in the same direction, and the third walls 24 of each battery cell 6 all face the same direction. In the thickness direction X, the connector 8 near the first wall 23 is connected to the second wall portion 232 of each battery cell 6, and the connector 8 near the third wall 24 is connected to the fourth wall portion 242 of each battery cell 6.

[0288] As another example, see Figure 21In the battery cell assembly 7, the first walls 23 of at least two battery cells 6 are arranged in opposite directions. The first walls 23 and third walls 24 of at least two battery cells 6 are oriented in the same direction. In these examples, a connector 8 connects a portion of the second wall 232 of the battery cells 6 and another portion of the fourth wall 242 of the battery cells 6, and another connector 8 connects the fourth wall 242 of the battery cells 6 and the second wall 232 of the other portion of the battery cells 6.

[0289] There can be one or more battery cell assemblies 7. When there are multiple battery cell assemblies 7, they are arranged along the thickness direction X of the first wall 23. The connector 8 located between two adjacent battery cell assemblies 7 can be connected to only one corresponding battery cell assembly 7 or to two adjacent battery cell assemblies 7.

[0290] In this embodiment, the connection between the connector 8 and the battery cell assembly 7 includes at least the connection between the connector 8 and the second wall portion 232 of at least a portion of the battery cells 6 in the battery cell assembly 7. Optionally, the connection between the connector 8 and the battery cell assembly 7 may further include the connection between the connector 8 and the fourth wall portion 242 of at least a portion of the battery cells 6 in the battery cell assembly 7.

[0291] Both sides of the battery cell assembly 7 are provided with connectors 8. Multiple connectors 8 can connect multiple battery cells 6 of the battery cell assembly 7 on both sides in the thickness direction X, which is beneficial to strengthen the structure of the battery cell assembly 7 on both sides in the thickness direction X and further improve the stability of the battery cell assembly 7.

[0292] In some embodiments, refer to Figures 23 to 25 The battery device 2 includes a plurality of battery cell assemblies 7 stacked along the thickness direction X. A plurality of connectors 8 include a first connector 801, which is disposed between two adjacent battery cell assemblies 7 and connected to the battery cells 6 of the two battery cell assemblies 7 along the thickness direction X.

[0293] The first connector 801 is connected to one of the battery cell assemblies 7 on one side along the thickness direction X, and the first connector 801 is connected to another battery cell assembly 7 on the other side along the thickness direction X.

[0294] In some examples, refer to Figure 23In two adjacent battery cell assemblies 7, the first walls 23 of all battery cells 6 in each battery cell assembly 7 are arranged in the same direction. Alternatively, the first walls 23 of two adjacent battery cell assemblies 7 may be arranged in opposite directions, close to each other, and partially overlapping along the thickness direction X. A first connector 801 is connected to the second wall portion 232 of each battery cell 6 in two adjacent battery cell assemblies 7.

[0295] In other examples, refer to Figure 23 and Figure 24 In two adjacent battery cell assemblies 7, the first walls 23 of all battery cells 6 in each battery cell assembly 7 are arranged in the same direction. The first walls 23 of one battery cell assembly 7 and the third walls 24 of the other battery cell assembly 7 are close to each other and partially overlap along the thickness direction X. A first connector 801 connects the second wall portion 232 of each battery cell 6 in one battery cell assembly 7 to the fourth wall portion 242 of each battery cell 6 in the other battery cell assembly 7.

[0296] In some other examples, in two adjacent battery cell assemblies 7, the first walls 23 of some battery cells 6 in each battery cell assembly 7 are arranged in opposite directions. A first connector 801 connects to the second wall portion 232 of some battery cells 6 in each battery cell assembly 7 and the fourth wall portion 242 of another battery cell 6.

[0297] In this embodiment, the battery cells 6 of two adjacent battery cell assemblies 7 are connected by the first connector 801, which not only helps to reduce the number of connectors 8, save space in the battery device 2, and increase the energy density of the battery device 2, but also helps to improve the stability of multiple battery cell assemblies 7.

[0298] In some embodiments, refer to Figure 22 , Figure 23 and Figure 25 The battery device 2 includes a housing 5 and a plurality of battery cell assemblies 7 housed in the housing 5. The plurality of connectors 8 also include a second connector 802 disposed between the housing 5 and the battery cell assembly 7 adjacent to the housing 5.

[0299] The second connector 802 can be connected to the housing 5, or it can be left unconnected to the housing 5.

[0300] The second connector 802 can fill at least part of the gap between the housing 5 and the battery cell assembly 7, thereby reducing the sway amplitude that the battery cell assembly 7 may generate under vibration or impact conditions, and improving the stability and reliability of the battery cell assembly 7.

[0301] In some embodiments, the housing 5 includes two first beams 501 arranged along the thickness direction X. A second connector 802 is connected to the first beams 501, or the second connector 802 is integrally formed with the first beams 501.

[0302] The connection methods between the second connector 802 and the first beam 501 include, but are not limited to, bonding, snap-fitting, and screw connection.

[0303] The second connector 802 is integrally formed with the first beam 501. A portion of the housing 5 is connected to the battery cell assembly 7 and forms the second connector 802.

[0304] Optionally, the battery device 2 includes a busbar 901, which connects a portion of the battery cell 6 to a first electrode terminal 31 and / or a second electrode terminal 32. At least a portion of the busbar 901 faces the first beam 501, and at least a portion of the second connector 802 protrudes from the surface of the busbar 901 facing the first beam 501, which helps to reduce the risk of interference between the busbar 901 and the first beam 501.

[0305] The second connector 802 is connected to or integrally formed with the first beam 501, which helps to enhance the connection strength between the battery cell assembly 7 and the housing 5, and enhances the overall rigidity and stability of the battery device 2.

[0306] In some embodiments, the housing 20 includes a third wall 24, and the first wall 23 and the third wall 24 are arranged along the thickness direction X. The electrode assembly 10 includes a second electrode 13 with the opposite polarity to the first electrode 12. The battery cell 6 includes a second electrode terminal 32 disposed on the third wall 24, and the second electrode terminal 32 is electrically connected to the second electrode 13. The battery device 2 includes a plurality of battery cell assemblies 7 arranged along the thickness direction X, and each battery cell assembly 7 includes a plurality of battery cells 6 stacked along the width direction Z of the first wall 23. The plurality of battery cell assemblies 7 include a first battery cell assembly 701 and a second battery cell assembly 702 disposed adjacently. All the first electrode terminals 31 and second electrode terminals 32 of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group, and all the first electrode terminals 31 and second electrode terminals 32 of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first terminal group and the orthographic projection of the second terminal group do not overlap.

[0307] In some examples, only the first electrode terminal 31 of the first battery cell assembly 701 faces the second battery cell assembly 702, and all the first electrode terminals 31 of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group.

[0308] In other examples, only the second electrode terminals 32 of the first battery cell assembly 701 face the second battery cell assembly 702, and all the second electrode terminals 32 of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group.

[0309] In some other examples, a portion of the first electrode terminals 31 and a portion of the second electrode terminals 32 of the first battery cell assembly 701 face the second battery cell assembly 702, and all the first electrode terminals 31 and all the second electrode terminals 32 of the first battery cell assembly 701 facing the second battery cell assembly 702 form a first terminal group.

[0310] Similarly, all the first electrode terminals 31 of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group; or, all the second electrode terminals 32 of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group; or, all the first electrode terminals 31 and all the second electrode terminals 32 of the second battery cell assembly 702 facing the first battery cell assembly 701 form a second terminal group.

[0311] The orthographic projection of any first electrode terminal 31 and / or second electrode terminal 32 in the first terminal group does not overlap with the orthographic projection of any first electrode terminal 31 and / or second electrode terminal 32 in the second terminal group.

[0312] Optionally, all electrode terminals of the first terminal group are arranged in a row along the width direction Z of the first wall 23, and all electrode terminals of the second terminal group are arranged in a row along the width direction Z of the first wall 23. The first terminal group and the second terminal group are spaced apart along the length direction Y of the first wall 23.

[0313] Along the thickness direction X, the first terminal group and the second terminal group do not overlap, which helps to reduce the risk of electrode terminals of the first terminal group and the second terminal group colliding under extreme working conditions such as vibration and impact, and improves the reliability of the battery device 2.

[0314] In some embodiments, the battery device 2 includes a fourth insulating member 902 disposed between two adjacent battery cell assemblies 7.

[0315] Optionally, two connectors 8 are provided between two adjacent battery cell assemblies 7, and the two connectors 8 are respectively connected to the two battery cell assemblies 7. Along the thickness direction X, the two connectors 8 at least partially overlap. A fourth insulating member 902 is provided between the two connectors 8.

[0316] The fourth insulating component 902 can further enhance the insulation effect between two adjacent battery cell components 7, which helps to further reduce the risk of overlap between the first terminal group and the second terminal group.

[0317] This application also provides an electrical device, which includes a battery device 2 provided according to any embodiment of this application, the battery device 2 being used to provide electrical energy.

[0318] The battery cell 6 provided in this embodiment includes an electrode assembly 10, a housing 20, a first electrode terminal 31, a first adapter 41, and a first insulating member 51. The electrode assembly 10 is housed within the housing 20 and includes a main body 11 and a first tab 12 connected to the main body 11. The housing 20 includes a first wall 23, which includes a first wall portion 231 and a second wall portion 232. In the thickness direction X, the first wall portion 231 is closer to the main body 11 than the second wall portion 232. A first recess 233 is formed on the side of the first wall 23 near the main body 11. The first bottom surface 2331 of the first recess 233 corresponds to the second wall portion 232, and the first recess 233 is recessed relative to the second surface 2311 of the first wall portion 231 facing the main body 11. The first electrode terminal 31 is disposed on the first wall portion 231. At least a portion of the first tab 12 is located on the side of the main body 11 near the first wall 23. The first insulating member 51 is housed within the outer casing 20. At least a portion of the first insulating member 51 is disposed between the main body portion 11 and the first wall 23 along the thickness direction X of the first wall 23. A portion of the first electrode tab 12 is located on the side of the first insulating member 51 away from the main body portion 11. In the same plane perpendicular to the thickness direction X, the orthographic projections of the first insulating member 51 and the first electrode tab 12 are both located within the orthographic projection of the first recess 233, and at least a portion of the first insulating member 51 and a portion of the first electrode tab 12 are both housed within the first recess 233. The first adapter 41 includes a first adapter portion 411, a second adapter portion 412, and a third adapter portion 413. At least a portion of the first adapter portion 411 is disposed between the first electrode terminal 31 and the main body portion 11 and connects to the first electrode terminal 31. At least a portion of the second adapter portion 412 is located between the first insulating member 51 and the second wall portion 232 and connects to the first electrode tab 12. The third adapter portion 413 connects the first adapter portion 411 and the second adapter portion 412.

[0319] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell, including the first wall; The first electrode terminal is disposed on the first wall; An electrode assembly is housed within the housing. The electrode assembly includes a main body and a first electrode tab connected to the main body. At least a portion of the first electrode tab is located on the side of the main body near the first wall. The first adapter connects the first electrode terminal and the first electrode tab; as well as A first insulating member is housed within the housing. In the thickness direction of the first wall, at least a portion of the first insulating member is disposed between the main body and the first wall, and a portion of the first tab is located on the side of the first insulating member away from the main body. In the same plane perpendicular to the thickness direction, the orthographic projection of the first electrode terminal and the orthographic projection of the first insulating member do not overlap. Along the direction from the main body to the first wall, a portion of the first insulating member protrudes from the first surface of the first electrode terminal near the main body.

2. The battery cell according to claim 1, characterized in that, In the same plane perpendicular to the thickness direction, the orthographic projection of the first electrode terminal and the orthographic projection of the first electrode tab do not overlap, and along the direction from the main body to the first wall, the first electrode tab partially protrudes from the first surface.

3. The battery cell according to claim 1 or 2, characterized in that, The first wall includes a first wall portion and a second wall portion. In the thickness direction, the first wall portion is closer to the main body portion than the second wall portion. The first electrode terminal is disposed on the first wall portion. A first recess is formed on the side of the first wall near the main body portion, the first bottom surface of the first recess corresponds to the second wall portion, and the first recess is recessed relative to the second surface of the first wall portion facing the main body portion; In the same plane perpendicular to the thickness direction, the orthographic projection of the first insulating member lies within the orthographic projection of the first recess, and at least a portion of the first insulating member is accommodated in the first recess.

4. The battery cell according to claim 3, characterized in that, In the same plane perpendicular to the thickness direction, the orthographic projection of the first tab lies within the orthographic projection of the first recess.

5. The battery cell according to claim 4, characterized in that, The first electrode tab is partially accommodated in the first recess.

6. The battery cell according to claim 3, characterized in that, The first adapter includes a first adapter portion, a second adapter portion, and a third adapter portion. At least a portion of the first adapter portion is disposed between the first electrode terminal and the main body portion and connected to the first electrode terminal. At least a portion of the second adapter portion is located between the first insulating member and the second wall portion and connected to the first electrode tab. The third adapter portion connects the first adapter portion and the second adapter portion.

7. The battery cell according to claim 3, characterized in that, The second wall portion has a third surface away from the main body portion, and the first electrode terminal does not extend beyond the third surface in the direction from the main body portion toward the first wall portion.

8. The battery cell according to claim 3, characterized in that, The first insulating element is connected to the second wall portion.

9. The battery cell according to claim 8, characterized in that, The second wall portion includes a first snap-fit ​​portion, and the first insulating member includes a second snap-fit ​​portion, wherein the first snap-fit ​​portion snaps into the second snap-fit ​​portion.

10. The battery cell according to claim 9, characterized in that, The second wall portion includes a first base portion and a first insulating portion that are interconnected, wherein the first base portion is located on the side of the first insulating portion away from the electrode assembly; The first insulating part includes the first snap-fit ​​part, which is a buckle, pointing in the direction from the first wall toward the main body part. The first snap-fit ​​part protrudes from the fifth surface of the first tab away from the main body part, and the second snap-fit ​​part is a slot.

11. The battery cell according to claim 3, characterized in that, The battery cell includes a second insulating member that covers the main body portion. A portion of the second insulating member is connected to the first insulating member, and another portion of the second insulating member is connected to the first wall portion.

12. The battery cell according to claim 3, characterized in that, The first recess extends to the edge of the first wall on at least one side in the width direction of the first wall, the width direction being perpendicular to the thickness direction.

13. The battery cell according to claim 3, characterized in that, The outer casing includes two second walls arranged along the width direction of the first wall, the width direction being perpendicular to the thickness direction; At least one second wall includes a wall body and a protrusion, the wall body being connected to the first wall portion, and the protrusion protruding from the wall body along the thickness direction and being connected to the second wall portion.

14. The battery cell according to claim 1, characterized in that, The first insulating member includes an insulating body and a first sidewall. A portion of the first tab is located on the side of the insulating body away from the main body. The first sidewall is connected to the insulating body on one side along the width direction of the first wall, and the width direction is perpendicular to the thickness direction. At least a portion of the first sidewall protrudes from the first surface in the direction from the main body to the first wall.

15. The battery cell according to claim 1, characterized in that, The first electrode includes a folding portion, a bending portion, and a connecting portion. The folding portion is connected to the main body portion. The connecting portion is located on the side of the first insulating member opposite to the main body portion and is connected to the first adapter. The bending portion connects the folding portion and the connecting portion and bends relative to the folding portion and the connecting portion. In the same plane perpendicular to the thickness direction, the orthographic projection of the end of the connecting portion away from the bending portion lies within the orthographic projection of the first insulating member.

16. The battery cell according to claim 1, characterized in that, The first insulating member has an opening, and the first electrode tab passes through the opening.

17. The battery cell according to claim 1, characterized in that, The battery cell includes two electrode assemblies stacked along the width direction of the first wall, the width direction being perpendicular to the thickness direction; In the width direction, at least a portion of the first insulating member is located between the first tabs of the two electrode assemblies.

18. The battery cell according to claim 1, characterized in that, The outer casing includes a third wall, and the first wall and the third wall are arranged along the thickness direction; The electrode assembly includes a second electrode tab connected to the main body portion, at least a portion of which is located on the side of the main body portion near the third wall, and the polarity of the second electrode tab is opposite to that of the first electrode tab; The battery cell includes a second adapter and a second electrode terminal disposed on the third wall, wherein the second adapter connects the second electrode terminal and the second tab.

19. The battery cell according to claim 18, characterized in that, The battery cell includes a third insulating member, at least a portion of which is disposed between the main body and the third wall in the thickness direction, and a portion of the second electrode tab is located on the side of the third insulating member away from the main body. In the same plane perpendicular to the thickness direction, the orthographic projection of the second electrode terminal and the orthographic projection of the third insulating member do not overlap. Along the direction from the main body to the third wall, a portion of the third insulating member protrudes from the fourth surface of the second electrode terminal near the main body.

20. The battery cell according to claim 18 or 19, characterized in that, The housing includes a fourth wall and a fifth wall arranged along the length direction of the first wall, the length direction being perpendicular to the thickness direction, and the fourth wall being closer to the first electrode terminal and the second electrode terminal than the fifth wall.

21. The battery cell according to claim 18, characterized in that, In the direction of gravity, the first tab is located below the first electrode terminal, the second tab is located below the second electrode terminal, and the thickness direction is perpendicular to the direction of gravity.

22. The battery cell according to claim 18 or 19, characterized in that, In the same plane perpendicular to the thickness direction, the orthographic projections of the first electrode terminal and the second electrode terminal do not overlap.

23. The battery cell according to claim 1, characterized in that, The electrode assembly includes a second electrode tab connected to the main body portion, at least a portion of which is located on the side of the main body portion closer to the first wall, and the polarity of the second electrode tab is opposite to that of the first electrode tab; The battery cell includes a second adapter and a second electrode terminal disposed on the first wall, wherein the second adapter connects the second electrode terminal and the second tab.

24. The battery cell according to claim 23, characterized in that, The battery cell includes a third insulating member, at least a portion of which is disposed between the main body and the first wall in the thickness direction, and a portion of the second tab is located on the side of the third insulating member away from the main body. In the same plane perpendicular to the thickness direction, the orthographic projection of the second electrode terminal and the orthographic projection of the third insulating member do not overlap. Along the direction from the main body to the first wall, at least a portion of the third insulating member protrudes from the fourth surface of the second electrode terminal near the main body.

25. The battery cell according to claim 24, characterized in that, The first wall includes a first wall portion and two second wall portions. In the thickness direction, the first wall portion is closer to the main body portion than the second wall portions. The first electrode terminal and the second electrode terminal are both disposed in the first wall portion. Two first recesses are formed on the side of the first wall near the main body portion. The first bottom surfaces of the two first recesses correspond to the two second wall portions respectively. The first recesses are recessed relative to the second surface of the first wall portion facing the main body portion. In the same plane perpendicular to the thickness direction, the orthographic projection of the first insulating member and the orthographic projection of the third insulating member are respectively located within the orthographic projections of the two first recesses, and at least a portion of the first insulating member and at least a portion of the third insulating member are respectively accommodated in the two first recesses.

26. The battery cell according to claim 1, characterized in that, The outer casing includes a housing and an end cap. The housing has a housing opening, and the end cap closes to the housing opening. The first wall is the end cap; or The housing includes a shell and two end caps. The shell has two shell openings, and the two end caps respectively cover the two shell openings. The first wall is one of the end caps.

27. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-20, 22.

28. The battery device according to claim 27, characterized in that, The first wall includes a first wall portion and a second wall portion disposed along its own length direction. In the thickness direction, the first wall portion is closer to the main body portion than the second wall portion. The first electrode terminal is disposed on the first wall portion. The battery device includes a connector and at least one battery cell assembly, the battery cell assembly including a plurality of battery cells stacked along the width direction of the first wall, the connector being connected to at least a portion of the second wall portion of the battery cells in the battery cell assembly; The length direction, the width direction, and the thickness direction are all perpendicular to each other.

29. The battery device according to claim 28, characterized in that, The outer casing includes a third wall, and the first wall and the third wall are arranged along the thickness direction; The third wall includes a third wall portion and a fourth wall portion disposed along the length direction, and in the thickness direction, the third wall portion is closer to the main body portion than the fourth wall portion; The electrode assembly includes a second electrode with a polarity opposite to that of the first electrode, and the battery cell includes a second electrode terminal disposed on the third wall portion, the second electrode terminal being electrically connected to the second electrode. In the battery cell assembly, the first walls of at least two of the battery cells are arranged in opposite directions; The connector is connected to the second wall of a portion of the battery cell in the battery cell assembly, and to the fourth wall of another portion of the battery cell in the battery cell assembly.

30. The battery device according to claim 28, characterized in that, The battery cell assembly has the connectors on both sides along the thickness direction.

31. The battery device according to claim 28, characterized in that, The battery device includes a plurality of battery cell assemblies stacked along the thickness direction; The connectors are multiple, and the multiple connectors include a first connector. In the thickness direction, the first connector is disposed between two adjacent battery cell assemblies and connected to the battery cells of the two battery cell assemblies.

32. The battery device according to claim 28, characterized in that, The battery device includes a housing and a plurality of battery cell assemblies housed within the housing; There are multiple connectors, including a second connector, which is disposed between the housing and the battery cell assembly near the housing.

33. The battery device according to claim 32, characterized in that, The box body includes two first beams arranged along the thickness direction; The second connector is connected to the first beam, or the second connector is integrally formed with the first beam.

34. The battery device according to claim 27, characterized in that, The outer casing includes a third wall, and the first wall and the third wall are arranged along the thickness direction; The electrode assembly includes a second electrode with a polarity opposite to that of the first electrode; The battery cell includes a second electrode terminal disposed on the third wall, and the second electrode terminal is electrically connected to the second tab. The battery device includes a plurality of battery cell assemblies arranged along the thickness direction, and each battery cell assembly includes a plurality of battery cells stacked along the width direction of the first wall; The plurality of battery cell assemblies include a first battery cell assembly and a second battery cell assembly arranged adjacent to each other. All the first electrode terminals and second electrode terminals of the first battery cell assembly facing the second battery cell assembly form a first terminal group, and all the first electrode terminals and second electrode terminals of the second battery cell assembly facing the first battery cell assembly form a second terminal group. In the same plane perpendicular to the thickness direction, the orthographic projection of the first terminal group does not overlap with the orthographic projection of the second terminal group.

35. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 21, 23-26.

36. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 27-35, the battery device being used to provide electrical energy.

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