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 an electrode assembly, a shell and a first adapter. The electrode assembly comprises a main body part and a first tab connected to the main body part. The main body part is accommodated in the shell, the shell comprises a first wall located on one side of the main body part along a first direction, and the first wall is provided with a first through hole. The first adapter is connected to the first tab, the first adapter is arranged through the first through hole, and a part of the first adapter is located on a side of the first wall away from the main body part and is welded to the first wall to form a welding part. The first adapter is more easily arranged out of the first wall, which is favorable for reducing assembly difficulty, improving assembly efficiency, reducing bending of the first tab and reducing the risk of cracking of the first tab. The application can also simplify the structure of the battery monomer and improve the energy density of the battery monomer.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to PCT application No. PCT / CN2025 / 145251, filed on December 24, 2025, entitled “Battery Cell, Battery Device and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0004] 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.

[0005] In the development of battery technology, simplifying the structure of individual battery cells and improving energy density and assembly efficiency is a research direction in battery technology. Utility Model Content

[0006] This application provides a battery cell, a battery device, and an electrical appliance, which helps to simplify the structure of the battery cell and improve its energy density and assembly efficiency.

[0007] According to a first aspect of this application, a battery cell is provided, comprising an electrode assembly, a housing, and a first adapter. The electrode assembly includes a main body and a first tab connected to the main body. The main body is housed within the housing, which includes a first wall located on one side of the main body along a first direction, and the first wall has a first through hole. The first adapter is connected to the first tab, passes through the first through hole, and a portion of the first adapter is located on the side of the first wall away from the main body and is welded to the first wall to form a welded portion.

[0008] In the battery cell provided in this application embodiment, a portion of the first adapter extends out of the outer casing through the first through hole and is welded to the first wall. Compared to the first tab, the first adapter is easier to pass through the first wall, which helps reduce assembly difficulty, improves assembly efficiency, reduces bending of the first tab, shortens the length of the first tab, thereby reducing the risk of cracking of the first tab and reducing material waste caused by die-cutting the first tab. The first adapter is welded to the first wall outside the casing, which can eliminate a traditional electrode terminal, simplify the structure of the battery cell, reduce the space occupied inside the casing, and improve the energy density of the battery cell; it can also reduce welding difficulty, reduce the adverse effects of welding operations on the first tab, and reduce the risk of welding particles falling into the casing and causing a short circuit.

[0009] In some embodiments, the first tab has a free end away from the main body, and along a first direction, a portion of the first adapter is located on the side of the free end closer to the main body. The first adapter can limit the warping of the free end of the first tab toward the main body, thereby reducing the risk of a short circuit caused by the first tab overlapping the main body.

[0010] In some embodiments, the first adapter includes two adapter layers, and the first tab has a free end away from the main body. The free end is disposed between the two adapter layers and welded to the two adapter layers. The first tab is welded to the two adapter layers between the two adapter layers, and the two adapter layers provide protection for the first tab, which helps to improve the welding strength and stability and reduce the adverse effects of welding heat on the first tab.

[0011] In some embodiments, each transition layer passes through the first through hole, and each transition layer includes a first transition segment located on the side of the first wall away from the main body. The first transition segments of two transition layers are stacked and welded to the first wall. This is beneficial for improving the welding strength and stability of the first transition component and the first wall.

[0012] In some embodiments, the transition layer includes a first transition segment, a second transition segment, a third transition segment, a first weak segment, and a second weak segment. The first transition segment is located on the side of the first wall away from the main body, the second transition segment is located on the side of the first wall close to the main body, and the third transition segment passes through a first through hole. The transition layer has a first groove on the side close to the main body along a first direction, and a second groove on the side away from the main body along the first direction. The first weak segment corresponds to the first groove and connects the first and third transition segments, and the second weak segment corresponds to the second groove and connects the second and third transition segments. The first and second weak segments are thinner and more prone to deformation. The first and second grooves provide clearance for bending the transition layer. Bending the transition layer at the first and second weak segments reduces the difficulty of bending, helps maintain the bent shape, reduces the welding difficulty between the transition layer and the first wall, and reduces the pulling effect of the transition layer on the first tab.

[0013] In some embodiments, the free end is spaced apart from the second weak segment along the arrangement direction of the second transition segment and the second weak segment. A certain gap is formed between the second transition segments of the two transition layers on the side near the second weak segment. This gap can provide room for the transition layer to bend at the second weak segment, facilitating the bending and shaping of the transition layer; it also helps to reduce the probability of the free end being squeezed when the transition layer is bent, and reduces the possibility of damage to the free end.

[0014] In some embodiments, the battery cell includes a first insulating member. At least a portion of the first insulating member is disposed between a first wall and a main body portion along a first direction. The first insulating member has a second through-hole that penetrates the first insulating member along the first direction. A first adapter member passes through the second through-hole. Along the first direction, a second adapter segment of one adapter layer is located on the side of its free end away from the main body portion and is at least partially accommodated in the second through-hole. The second through-hole provides at least partial accommodating space for the second adapter segment of one adapter layer. This second adapter segment can share at least a portion of the space in the first direction with the first insulating member, which is beneficial for improving space utilization and increasing the energy density of the battery cell.

[0015] In some embodiments, the two transition layers have the same thickness. This helps reduce the risk of either transition layer being too thin and damaged during welding, thus improving the welding effect.

[0016] In some embodiments, a recess is provided on the side of the first wall away from the main body along the first direction, and a portion of the first adapter is accommodated in the recess. The recess provides at least partial accommodating space for the portion of the first adapter that protrudes from the first through hole, which helps to reduce the extra space occupied by the first adapter outside the housing, improves space utilization, and thereby increases the energy density of the battery cell.

[0017] In some embodiments, the first wall includes a first portion and a second portion. Along a first direction, the second portion corresponds to the recess. Along the first direction, at least a portion of the second portion is closer to the main body than the first portion. The first adapter is welded to the second portion. The fact that at least a portion of the second portion is closer to the main body than the first portion increases the depth of at least a portion of the recess, thereby providing more accommodating space for the first adapter. It also helps to increase the thickness of the second portion, reducing the impact of the recess on the structural strength of the first wall.

[0018] In some embodiments, the first through hole extends through the second portion along a first direction. This reduces the height difference in the first direction between the position where the first adapter protrudes from the first through hole and the position where the first adapter and the first wall are welded, reduces the phenomenon of the first adapter arching in the recess, reduces the space occupied by the first adapter in the first direction in the recess, and also reduces the degree of bending of the first adapter, lowering the difficulty of bending and the risk of cracking.

[0019] In some embodiments, the second portion includes a first sub-part and a second sub-part. Along the first direction, the first surface of the first sub-part facing away from the main body is closer to the main body than the second surface of the second sub-part facing away from the main body, and the first sub-part is closer to the main body than the first portion. In the same plane perpendicular to the first direction, the orthographic projection of the portion of the first adapter received in the recess at least partially overlaps with the orthographic projection of the first sub-part, and is spaced apart from the orthographic projection of the second sub-part. The degree to which the first sub-part is recessed relative to the first portion is greater than the degree to which the second sub-part is recessed relative to the first portion, which can provide more receiving space for the first adapter in the first direction and reduce the additional space occupied by the first adapter outside the housing. The portion of the first adapter extending out of the first through hole and the second sub-part do not overlap, and the portion of the first adapter extending out of the first through hole and the second sub-part can share part of the space in the first direction, which is beneficial to improving space utilization.

[0020] In some embodiments, along a first direction, a portion of the first adapter is located on the side of the second sub-part closer to the main body; the first portion includes a fourth surface facing the main body. Along the direction from the first wall towards the main body, both the first and second sub-parts extend beyond the fourth surface, with the dimension of the second sub-part extending beyond the fourth surface being smaller than the dimension of the first sub-part extending beyond the fourth surface. A larger dimension of the first sub-part extending beyond the fourth surface is advantageous for increasing the thickness of the first sub-part and reducing the impact of a greater degree of recess in the first sub-part on the structural strength of the first wall. A smaller dimension of the second sub-part extending beyond the fourth surface is advantageous for reducing the possibility of interference between the second sub-part and the first adapter within the housing.

[0021] In some embodiments, the first through hole is enclosed by a first sub-part and a second sub-part. This reduces the height difference in the first direction between the position where the first adapter protrudes from the first through hole and the position where the first adapter is welded to the first wall, reducing the arching of the first adapter within the recess, reducing the space occupied by the first adapter, reducing the degree of bending of the first adapter, and lowering the risk of cracking of the first electrode lug. Compared to the first through hole being located within the first sub-part, the first through hole being enclosed by the first and second sub-parts helps to reduce the size of the first sub-part and minimize the impact of the first sub-part's placement on the structural strength of the first wall.

[0022] In some embodiments, the second portion includes a third sub-portion connected to the first portion and the second sub-portion. Along a first direction, the third surface of the third sub-portion, facing away from the main body, is further away from the main body than the second surface. The battery cell includes a cover member connected to the third surface. Along the first direction, the cover member covers the first through-hole. At least a portion of the cover member can be accommodated within a recess. The cover member shares a portion of the space along the first direction with the first portion, which helps improve space utilization and increase the energy density of the battery cell.

[0023] In some embodiments, the battery cell includes a first insulating member, at least a portion of which is disposed between the main body and the first wall along a first direction; the first insulating member has a second through hole extending along the first direction, a first adapter is disposed through the second through hole, and at least a portion of the second part is accommodated in the second through hole. Utilizing the space occupied by the first insulating member in the first direction within the housing to accommodate at least a portion of the second part helps reduce the additional space occupied by the second part within the housing, thereby improving the space utilization rate inside the housing.

[0024] In some embodiments, the battery cell includes a first insulating member and a second insulating member. Along a first direction, at least a portion of the first insulating member is disposed between the main body and a first wall, and the second insulating member is configured to fix the first insulating member to the main body. The second insulating member can restrict the displacement and movement of the first insulating member within the housing, improving the stability of the first insulating member, thereby improving the insulation effect and increasing the reliability of the battery cell. Furthermore, the provision of the second insulating member also helps to improve the insulation effect between the main body and the housing.

[0025] In some embodiments, the second insulating member includes a first fixing portion and two second fixing portions spaced apart along a second direction, the second direction being perpendicular to the first direction. Along the first direction, at least a portion of the first fixing portion is located between the first insulating member and the first wall. The first fixing portion connects to the two second fixing portions, which are respectively connected to two opposing surfaces of the main body along the second direction. The second insulating member can provide a balanced binding effect on the first insulating member, reducing the possibility of displacement or warping of the first insulating member on either side along the second direction, and improving the stability of the first insulating member relative to the main body.

[0026] In some embodiments, the orthographic projections of the first fixing part and the first through hole are spaced apart in the same plane perpendicular to the first direction. This helps to reduce interference between the first fixing part and the first adapter, and facilitates the smooth passage of a portion of the first adapter through the first wall.

[0027] In some embodiments, the battery cell includes a third insulating member, which covers at least a portion of the outer side of the main body and is thermally fused with a first insulating member to form a welded portion. The first insulating member has a first end face and a side face, the first end face facing a first wall along a first direction, and the side face intersecting the first end face. At least a portion of the second insulating member is located between the side face and the third insulating member, and the welded portion is spaced apart from the second insulating member. This reduces the adverse effects of heat generated during the thermal fusion of the third and first insulating members on the second insulating member, lowers the risk of partial melting of the second insulating member affecting its structural strength, and also reduces the risk of warping caused by partial melting of the second insulating member damaging the third insulating member or causing the third insulating member to warp.

[0028] In some embodiments, the battery cell includes a cover attached to a first wall and covering a first through-hole along a first direction. The cover prevents external particles, water, and other impurities from entering the casing through the first through-hole, causing contamination or a short circuit risk.

[0029] In some embodiments, along the first direction, a recess is provided on the side of the first wall away from the main body, and a first through hole communicates with the recess. A portion of the first adapter and at least a portion of the cover are accommodated in the recess. The recess provides accommodating space for the portion of the first adapter that protrudes from the first through hole and provides at least partial accommodating space for the cover. This helps to reduce the additional space occupied by the cover and the first adapter in the first direction, improves space utilization, and thereby increases the energy density of the battery cell.

[0030] In some embodiments, the cover is welded to the first wall and used for connection with the busbar component. The cover can replace traditional electrode terminals and is welded to the busbar component, which simplifies the structure of the battery cell and saves space occupied by the electrode terminals. Welding the cover to the first wall enables electrical connection between the cover and the first adapter, reducing welding difficulty and improving connection strength.

[0031] In some embodiments, the cover is used for welding to the busbar component; the battery cell includes an separator, at least a portion of which is disposed between the cover and the welded portion along a first direction, the thermal conductivity of the separator being less than that of the cover. The separator can reduce the heat transferred to the welded portion during welding of the cover and the busbar component, reduce the adverse effects of the welding operation on the welded portion, and reduce the risk of cracking or breakage of the welded portion leading to failure of the first adapter and the first wall connection, thereby improving the reliability of the battery cell.

[0032] In some embodiments, the spacer completely covers the welded portion along the direction from the first wall toward the main body. The spacer completely separates the welded portion from the cover in the first direction, and the spacer can prevent the heat generated during the welding of the cover and the busbar from being transferred to the welded portion, thereby reducing the adverse effects of the welding operation of the cover and the busbar on the welded portion.

[0033] In some embodiments, the melting point of the insulating element is higher than that of the cover element. A higher melting point of the insulating element helps reduce the risk of it melting during welding of the cover element and the busbar component, improves the structural stability of the insulating element, and thus enhances its thermal insulation performance.

[0034] In some embodiments, the outer casing includes two second walls spaced apart along a second direction perpendicular to the first direction. The battery cell includes two first tabs, each first tab comprising multiple first tab layers. These multiple first tab layers converge towards the two second walls. By employing a C-shaped bend in the first tab, the length of the first tab can be appropriately extended, providing a certain degree of redundancy for tensile deformation. This helps alleviate the pulling effect on the first tab when the first adapter passes through the first through-hole, reducing the tensile stress on the first tab and lowering the risk of breakage. Separating the two first tabs helps reduce the thickness of a single first tab and the space occupied by the first tab in the first direction within the outer casing, thereby increasing the energy density of the battery cell.

[0035] In some embodiments, the battery cell includes two first adapters, which are respectively connected to two first tabs; the first wall is provided with two first through holes, and the two first adapters are respectively inserted through the two first through holes. This simplifies the structure of the first adapters, reduces the assembly difficulty of the first adapters, and improves assembly efficiency.

[0036] In some embodiments, two first through holes are spaced apart along a second direction, and two first adapters are welded to the portion of the first wall located between the two first through holes along the second direction. The bending shape of each first adapter is generally U-shaped, which, compared to U-shaped or other bending shapes, helps to reduce the degree of bending of the first adapter, reduce the risk of cracking, and reduce the difficulty of bending.

[0037] In some embodiments, along a first direction, a recess is provided on the side of the first wall away from the main body. The first wall includes a first portion and a second portion, with the second portion corresponding to the recess along the first direction, and a first through hole penetrating the second portion. The second portion includes a first sub-part and a second sub-part. Along the first direction, the first surface of the first sub-part facing away from the main body is closer to the main body than the second surface of the second sub-part facing away from the main body. Along the second direction, at least a portion of the first sub-part is located between the two first through holes, and both first adapters are welded to the portion of the first sub-part located between the two first through holes. The first sub-part is more recessed than the second sub-part, providing more space for the two first adapters, thereby improving space utilization. The second portion only needs to have one more recessed first sub-part, which helps reduce molding difficulty.

[0038] In some embodiments, the orthographic projections of the two first adapters are spaced apart in the same plane perpendicular to the first direction. This prevents the two first adapters from overlapping in the first direction, allowing them to share space and thus improving space utilization. It also helps reduce interference between the two first adapters, lowering the risk of edge warping, bending deformation, and other factors affecting welding strength.

[0039] In some embodiments, the housing includes a third wall, and along a first direction, the main body is disposed between the first wall and the third wall; the battery cell includes an electrode terminal disposed on the third wall, and the electrode assembly includes a second tab connected to the main body, the first tab and the second tab having opposite polarities, and the second tab and the electrode terminal being electrically connected.

[0040] In some embodiments, the battery cell includes two second tabs, which are disposed separately along a second direction perpendicular to the first direction. Distributing the two second tabs separately helps to reduce the thickness of each individual second tab and the space occupied by the second tabs in the first direction within the casing, thereby increasing the energy density of the battery cell.

[0041] In some embodiments, the housing includes two second walls disposed along a second direction perpendicular to the first direction; the battery cell includes a third insulating member, a fourth insulating member, and a fifth insulating member; along the first direction, at least a portion of the fourth insulating member is disposed between the main body and the third wall; the third insulating member covers the outer side of at least a portion of the main body and is connected to the fourth insulating member; along the second direction, a portion of the third insulating member and at least a portion of the fifth insulating member are stacked between the second wall and the second tab.

[0042] In some embodiments, along the third direction, the size of the fifth insulating member is greater than or equal to the size of the second tab, and both ends of the second tab along the third direction do not extend beyond the fifth insulating member; the first direction, the second direction, and the third direction are perpendicular to each other. The third insulating member and the fifth insulating member can form a double-layer insulation barrier between the second wall and the second tab, which helps to reduce the risk of short circuits caused by the second tab and the second wall overlapping due to warping, wrinkling, or damage of either the third insulating member or the fifth insulating member, thereby improving the reliability of the battery cell.

[0043] In some embodiments, the orthographic projection of the second electrode tab lies within the orthographic projection of the fifth insulating member in the same plane perpendicular to the second direction. The fifth insulating member can completely cover the second electrode tab, preventing any area of ​​the second electrode tab from overlapping with the second wall, thereby improving the insulation and isolation effect of the fifth insulating member on the second electrode tab and the second wall.

[0044] In some embodiments, the fifth insulating member includes a first insulating portion and a second insulating portion. Along a second direction, at least a portion of the first insulating portion is disposed between the electrode assembly and the second wall. Along a first direction, at least a portion of the second insulating portion is disposed between the electrode assembly and the third wall. The first insulating portion insulates and isolates the electrode assembly and the second wall. The placement of the second insulating portion facilitates increasing the insulating area of ​​the fifth insulating member and also facilitates better cooperation between the fifth insulating member and other structures (e.g., a fourth insulating member), thus simplifying the installation and fixation of the fifth insulating member.

[0045] In some embodiments, the housing includes a housing and an end cap, the housing having an opening on one side along a first direction, the end cap being connected to the housing and covering the opening; the third wall is the end cap, and the housing is integrally formed and includes the first wall.

[0046] In some embodiments, the housing includes a housing and two end caps, the housing having openings on both sides along a first direction, the two end caps being connected to the housing and respectively covering the two openings; a first wall is one of the end caps, and a third wall is the other end cap.

[0047] According to a second aspect of this application, this application also provides a battery device comprising a battery cell provided in any of the embodiments.

[0048] 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

[0049] 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.

[0050] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0051] Figure 2 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0052] Figure 3 This is a schematic diagram of the structure of a battery cell provided in the first embodiment of this application.

[0053] Figure 4 yes Figure 3 An exploded view of the battery cell shown.

[0054] Figure 5 yes Figure 3 The cross-sectional view of the battery cell shown.

[0055] Figure 6 yes Figure 5 A magnified view of region A in the middle.

[0056] Figure 7 yes Figure 6 A magnified view of region C in the middle.

[0057] Figure 8 This is a partial cross-sectional view of a battery cell provided in the second embodiment of this application.

[0058] Figure 9 This is a partial cross-sectional view of a battery cell provided in the third embodiment of this application.

[0059] Figure 10 This is a partial structural schematic diagram of a battery cell provided in the fourth embodiment of this application.

[0060] Figure 11 yes Figure 10 A magnified schematic diagram of region D in the middle.

[0061] Figure 12 yes Figure 10 The diagram shows the partial structure and the structure after the third insulating component is assembled.

[0062] Figure 13 yes Figure 5 A magnified view of region B in the middle.

[0063] Figure 14 This is a partial cross-sectional view of a battery cell provided in the fifth embodiment of this application.

[0064] Figure 15 This is an exploded view of a battery cell provided in the sixth embodiment of this application.

[0065] Figure 16 yes Figure 15 The cross-sectional view of the battery cell shown.

[0066] Figure 17 yes Figure 16 A magnified view of region E in the middle.

[0067] The attached figures are labeled as follows:

[0068] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Storage space; 6. Battery cell.

[0069] 10. Electrode assembly; 11. Main body; 12. First tab; 121. Free end; 13. Second tab; 20. Outer shell; 21. Housing; 211. Housing opening; 22. End cap; 23. First wall; 231. First through hole; 232. Recess; 233. First part; 233a. Fourth surface; 234. Second part; 2341. First sub-part; 2341a. First surface; 2342. Second sub-part; 2342a. Second surface; 2343. Third sub-part; 2343a. Third surface; 235. Third part; 24. Second wall; 25. Third wall; 26. Fourth wall; 30. Cover; 40. Isolator; 51. First insulating member; 511. Second through hole; 512. Support; 512a. Fifth surface, 512b; Sixth surface, 513; Connecting part, 51a; First end face, 51b; Side side, 52; Second insulating member, 521; First fixing part, 522; Second fixing part, 53; Third insulating member, 54; Fourth insulating member, 55; Fifth insulating member, 551; First insulating part, 552; Second insulating part, 60; Electrode terminal, 81; First adapter, 811; Adapter layer, 8111; First adapter segment, 8112; Second adapter segment, 8113; Third adapter segment, 8114; First weak segment, 8115; Second weak segment, 8116; First groove, 8117; Second groove, 82; Second adapter, N; Welding part, W; Welding part, X; First direction, Y; Second direction, Z; Third direction. Detailed Implementation

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In this application, "multiple" means two or more (including two).

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] The electrode assembly includes a positive electrode, a negative electrode, and an isolation structure. 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 isolation structure, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0082] 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.

[0083] 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.

[0084] In some implementations, the isolation structure is positioned between the positive and negative electrodes.

[0085] In some embodiments, the isolation structure is an isolation membrane. This application does not impose any particular limitation on the type of isolation membrane; any known porous isolation membrane with good chemical and mechanical stability can be selected.

[0086] In some embodiments, the isolation structure 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.

[0087] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0088] In some embodiments, the electrode assembly has a stacked structure.

[0089] 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.

[0090] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0095] The tabs are typically connected indirectly to the electrode terminals via adapters. The adapters and electrode terminals are usually welded inside the casing, occupying a significant amount of internal space and affecting the energy density of the individual battery cells.

[0096] To reduce the space occupied by mechanical components within the casing, the applicant proposed a solution where a portion of the tab extends beyond the casing and is welded to the casing wall. This not only reduces the space occupied by the tab within the casing but also eliminates the need for electrode terminals, simplifying the structure of the battery cell and reducing welding difficulty. However, the tab is relatively flexible and typically comprises multiple tab layers, making it difficult to extend the tab beyond the casing, thus affecting assembly efficiency. After extending beyond the casing, the tab needs to be bent again, which can easily cause interference with the casing wall, leading to localized stress concentration and cracking. Extending the tab beyond the casing requires a certain length, which, for die-cut tabs, results in excessive material being cut off, leading to significant material waste.

[0097] In view of this, the present application provides a technical solution in which the adapter connected to the electrode tab extends out of the outer shell and is welded to the outer shell. Compared with the electrode tab, the adapter is easier to extend out of the outer shell, which helps to reduce assembly difficulty, improve assembly efficiency, reduce bending of the electrode tab, shorten the length of the electrode tab, thereby reducing the risk of electrode tab cracking and reducing material waste caused by die-cutting the electrode tab.

[0098] The technical solutions provided in this application are applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0099] 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.

[0100] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.

[0108] Figure 3 This is a schematic diagram of the structure of a single battery cell provided in the first embodiment of this application. Figure 4 yes Figure 3 An exploded view of the battery cell shown. (Refer to...) Figure 3 and Figure 4 The battery cell 6 includes an electrode assembly 10 and a housing 20, with a portion of the electrode assembly 10 disposed within the housing 20.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] As an example, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having a housing opening and the end cap 22 for closing the housing opening.

[0113] 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 a part of the electrode assembly 10, the electrolyte, and other components.

[0114] 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 for the battery cell 6.

[0115] 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.

[0116] The end cap 22 can be connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0117] 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.

[0118] Figure 5 yes Figure 3 The cross-sectional view of the battery cell shown. Figure 6 yes Figure 5 An enlarged schematic diagram of region A in the middle. Figure 7 yes Figure 6 An enlarged schematic diagram of region C in the middle. Figure 8 This is a partial cross-sectional view of a battery cell provided in the second embodiment of this application. Figure 9 This is a partial cross-sectional view of a battery cell provided in the third embodiment of this application. Figure 10 This is a partial structural schematic diagram of a battery cell provided in the fourth embodiment of this application. Figure 11 yes Figure 10 An enlarged schematic diagram of region D in the middle. Figure 12 yes Figure 10 The diagram shows the partial structure and the structure after the third insulating component is assembled. Figure 13 yes Figure 5 An enlarged schematic diagram of region B in the middle. Figure 14 This is a partial cross-sectional view of a battery cell provided in the fifth embodiment of this application. Figure 15 This is an exploded view of a single battery cell provided in the sixth embodiment of this application. Figure 16 yes Figure 15 The cross-sectional view of the battery cell shown. Figure 17 yes Figure 16 A magnified view of region E in the middle.

[0119] Reference Figures 3 to 17 This application provides a battery cell 6, which includes an electrode assembly 10, a housing 20, and a first adapter 81. The electrode assembly 10 includes a main body 11 and a first tab 12 connected to the main body 11, the main body 11 being housed within the housing 20. The housing 20 includes a first wall 23 located on one side of the main body 11 along a first direction X, and the first wall 23 has a first through hole 231. The first adapter 81 is connected to the first tab 12, the first adapter 81 passing through the first through hole 231, and a portion of the first adapter 81 is located on the side of the first wall 23 away from the main body 11 and is welded to the first wall 23 to form a welded portion W.

[0120] The first wall 23 can be one of the walls of the housing 21, or it can be an end cap 22. Optionally, in Figure 4 In the embodiment shown, the first wall 23 is an end cap 22.

[0121] In one example, the first through hole 231 penetrates the first wall 23 along the first direction X. In other examples, the direction in which the first through hole 231 penetrates the first wall 23 may also intersect the first direction X.

[0122] The shape of the first through hole 231 can be various, such as rectangular, oblong, or elliptical. Optionally, the first through hole 231 is an elongated rectangular hole.

[0123] A portion of the first tab 12 is located between the main body 11 and the first wall 23. In one example, the first tab 12 extends from the side of the main body 11 along the first direction X near the first wall 23. In other examples, the first tab 12 may also extend from other sides of the main body 11, with a portion of the first tab 12 extending to the side of the main body 11 near the first wall 23.

[0124] The main body 11 includes a positive current collector, a positive active material layer disposed on the surface of the positive current collector, a negative current collector, a negative active material layer disposed on the surface of the negative current collector, and an isolation structure.

[0125] In one example, the first tab 12 is a positive tab, and the first tab 12 is connected to the positive current collector body. Optionally, the first tab 12 and the positive current collector body are integrally formed.

[0126] In another example, the first tab 12 is a negative tab, and the first tab 12 is connected to the negative current collector body. Optionally, the first tab 12 is integrally formed with the negative current collector body.

[0127] Optionally, the first electrode tab 12 is entirely located on the side of the first wall 23 near the main body 11. Alternatively, a portion of the first electrode tab 12 is located on the side of the first wall 23 near the main body 11, and another portion of the first electrode tab 12 can be accommodated in the first through hole 231.

[0128] A portion of the first adapter 81 is located on the side of the first wall 23 near the main body 11 and is welded to the first electrode 12. The welding methods of the first adapter 81 and the first electrode 12 include, but are not limited to, laser welding or ultrasonic welding.

[0129] A portion of the first adapter 81 extends through the first through hole 231 and is welded to the first wall 23. A portion of the first adapter 81 and a portion of the first wall 23 are heated and melted together to form a welded part W. The welding methods for the first adapter 81 and the first wall 23 include, but are not limited to, laser welding or ultrasonic welding.

[0130] In the battery cell 6 provided in this application embodiment, a portion of the first adapter 81 extends out of the outer shell 20 through the first through hole 231 and is welded to the first wall 23. Compared with the first tab 12, the first adapter 81 is easier to pass through the first wall 23, which helps to reduce assembly difficulty, improve assembly efficiency, reduce bending of the first tab 12, shorten the length of the first tab 12, thereby reducing the risk of cracking of the first tab 12 and reducing material waste caused by die-cutting the first tab 12.

[0131] The first adapter 81 is welded to the first wall 23 on the outside of the housing 20, which can eliminate a traditional electrode terminal, simplify the structure of the battery cell 6, reduce the space occupied inside the housing 20, and improve the energy density of the battery cell 6. It can also reduce the welding difficulty, reduce the adverse effects of the welding operation of the first adapter 81 and the first wall 23 on the first tab 12, and reduce the risk of welding particles falling into the housing 20 and causing a short circuit.

[0132] In some embodiments, refer to Figure 6 The first electrode 12 has a free end 121 away from the main body 11, and along the first direction X, a portion of the first adapter 81 is located on the side of the free end 121 close to the main body 11.

[0133] The free end 121 is an end section of the first pole tab 12 away from the main body 11, and is used to connect to the first adapter 81.

[0134] In one example, the first adapter 81 is a single-layer structure, with a portion of the first adapter 81 located on the side of the free end 121 near the main body 11. In another example, the first adapter 81 is a multi-layer structure, with a portion of at least one layer of the first adapter 81 located on the side of the free end 121 near the main body 11. In yet another example, the first adapter 81 may also wrap around the outside of the free end 121.

[0135] The first adapter 81 can limit the edge of the free end 121 from warping toward the main body 11, thereby reducing the risk of short circuit caused by the first tab 12 overlapping the main body 11.

[0136] In some embodiments, refer to Figure 6 The first adapter 81 includes two adapter layers 811. The first tab 12 has a free end 121 away from the main body 11. The free end 121 is located between the two adapter layers 811 and is welded to the two adapter layers 811.

[0137] The welding methods for the transition layer 811 and the first tab 12 include, but are not limited to, ultrasonic welding or laser welding.

[0138] The thicknesses of the two transition layers 811 can be the same or different.

[0139] Either of the two transition layers 811 passes through the first through hole 231 and extends to the side of the first wall 23 away from the main body 11. Alternatively, both transition layers 811 pass through the first through hole 231 and extend to the side of the first wall 23 away from the main body 11.

[0140] Along the first direction X, a portion of one transition layer 811 is located between the free end 121 and the first wall 23, and a portion of another transition layer 811 is located between the free end 121 and the main body 11.

[0141] The first tab 12 is welded between the two transition layers 811. The two transition layers 811 provide protection for the first tab 12, which helps to improve the welding strength and stability and reduce the adverse effects of welding heat on the first tab 12.

[0142] In some embodiments, refer to Figure 6 and Figure 7 Each transition layer 811 passes through the first through hole 231. Each transition layer 811 includes a first transition segment 8111, located on the side of the first wall 23 away from the main body 11. The first transition segments 8111 of the two transition layers 811 are stacked and welded to the first wall 23. This improves the welding strength and stability between the first transition component 81 and the first wall 23.

[0143] The welding methods for the transition layer 811 and the first wall 23 include, but are not limited to, ultrasonic welding or laser welding.

[0144] In some embodiments, refer to Figure 6 and Figure 7 The transition layer 811 includes a first transition segment 8111, a second transition segment 8112, a third transition segment 8113, a first weak segment 8114, and a second weak segment 8115. The first transition segment 8111 is located on the side of the first wall 23 away from the main body 11, the second transition segment 8112 is located on the side of the first wall 23 close to the main body 11, and the third transition segment 8113 passes through the first through hole 231. The transition layer 811 has a first groove 8116 on the side of the transition layer 811 close to the main body 11 along the first direction X, and a second groove 8117 on the side of the transition layer 811 away from the main body 11 along the first direction X. The first weak segment 8114 corresponds to the first groove 8116 and connects the first transition segment 8111 and the third transition segment 8113. The second weak segment 8115 corresponds to the second groove 8117 and connects the second transition segment 8112 and the third transition segment 8113.

[0145] The first transition segments 8111 of the two transition layers 811 are stacked and welded to the first wall 23. The free end 121 of the first tab 12 is located between the second transition segments 8112 of the two transition layers 811 and is welded to the second transition segments 8112 of the two transition layers 811.

[0146] The first groove 8116 and the first weak segment 8114 can be formed by removing part of the material on the side of the transition layer 811 close to the main body 11, and the second groove 8117 and the second weak segment 8115 can be formed by removing part of the material on the side of the transition layer 811 away from the main body 11.

[0147] The third transition segment 8113 bends away from the main body 11 relative to the second transition segment 8112, and the first transition segment 8111 bends along the second direction Y relative to the third transition segment 8113, with the second direction Y being perpendicular to the first direction X.

[0148] Compared to the first transition segment 8111, the second transition segment 8112, and the third transition segment 8113, the first weak segment 8114 and the second weak segment 8115 are thinner and more prone to deformation. The first groove 8116 and the second groove 8117 provide space for bending of the transition layer 811. Bending the transition layer 811 at the first weak segment 8114 and the second weak segment 8115 reduces the difficulty of bending and helps the transition layer 811 maintain its bent shape. This also reduces the welding difficulty between the transition layer 811 and the first wall 23 and reduces the pulling effect of the transition layer 811 on the first tab 12.

[0149] The first groove 8116 is located on the side of the transition layer 811 along the first direction X, close to the main body 11. The first transition segment 8111 bends relative to the third transition segment 8113 toward the side of the transition layer 811 where the first groove 8116 is located, which helps to reduce the risk of the transition layer 811 breaking at the first weak segment 8114. The second groove 8117 is located on the side of the transition layer 811 along the first direction X, away from the main body 11. The third transition segment 8113 bends relative to the second transition segment 8112 toward the side of the transition layer 811 where the second groove 8117 is located, which helps to reduce the risk of the transition layer 811 breaking at the second weak segment 8115.

[0150] In some embodiments, refer to Figure 6 Along the arrangement direction of the second transition section 8112 and the second weak section 8115, the free end 121 is spaced apart from the second weak section 8115.

[0151] Optionally, the second weak segment 8115 is connected to one end of the second transition segment 8112 along the second direction Y, and the free end 121 is spaced apart from the second weak segment 8115 along the second direction Y.

[0152] The free end 121 is located between the second transition segments 8112 of the two transition layers 811. A certain gap is formed between the second transition segments 8112 of the two transition layers 811 on the side near the second weak segment 8115. This gap can provide room for the transition layer 811 to bend at the second weak segment 8115, which facilitates the bending and shaping of the transition layer 811. It also helps to reduce the probability of the free end 121 being squeezed when the transition layer 811 is bent, and reduces the possibility of damage to the free end 121.

[0153] In some embodiments, refer to Figure 4 and Figure 8 The battery cell 6 includes a first insulating member 51, at least a portion of which is disposed between the first wall 23 and the main body 11 along the first direction X. The first insulating member 51 has a second through hole 511, which penetrates the first insulating member 51 along the first direction X. A first adapter 81 passes through the second through hole 511. Along the first direction X, a second adapter segment 8112 of an adapter layer 811 is located on the side of the free end 121 away from the main body 11 and is at least partially accommodated in the second through hole 511.

[0154] The first insulating member 51 is used to insulate and isolate the main body 11 and the first wall 23. Optionally, the first insulating member 51 is a plastic part.

[0155] The first insulating element 51 may be connected to the first wall 23 by bonding, heat fusion or other means; the first insulating element 51 may also simply contact or abut against the first wall 23.

[0156] A portion of the first adapter 81 passes sequentially through the second through hole 511 and the first through hole 231 and extends to the outer side of the first wall 23 away from the main body 11. The second through hole 511 provides clearance for the first adapter 81. Optionally, the first through hole 231 penetrates the first wall 23 along the first direction X, and the second through hole 511 and the first through hole 231 are arranged opposite each other along the first direction X, which helps to reduce the bending of the first adapter 81 and facilitates the first adapter 81 passing sequentially through the second through hole 511 and the first through hole 231.

[0157] In the same plane perpendicular to the first direction X, the orthographic projection of the first through hole 231 is located within the orthographic projection of the second through hole 511, which helps to reduce the obstruction of the first insulating member 51 to the first adapter 81 and facilitates the smooth passage of the first adapter 81 through the first wall 23.

[0158] In the same plane perpendicular to the first direction X, the orthographic projection of the second transition segment 8112 of a transition layer 811 is located within the orthographic projection of the second through hole 511, so as to reduce the interference between the transition layer 811 and the first insulating member 51.

[0159] The second through hole 511 provides at least a partial accommodating space for the second transition segment 8112 of a transition layer 811. The second transition segment 8112 can share at least a portion of the space in the first direction X with the first insulating member 51, which is beneficial to improving space utilization and increasing the energy density of the battery cell 6.

[0160] In some embodiments, the two transition layers 811 have the same thickness. This helps reduce the risk of either transition layer 811 being too thin and damaged during welding, thus improving the welding effect.

[0161] Optionally, the first transition segment 8111, the second transition segment 8112, and the third transition segment 8113 of the transition layer 811 have the same thickness. The first transition segment 8111, the second transition segment 8112, and the third transition segment 8113 of the two transition layers 811 have the same thickness.

[0162] In some embodiments, refer to Figures 6 to 9 Along the first direction X, a recess 232 is provided on the side of the first wall 23 away from the main body 11, and a part of the first adapter 81 is accommodated in the recess 232.

[0163] Optionally, in the same plane perpendicular to the first direction X, the orthographic projections of the first transition segments 8111 of the two transition layers 811 are both located within the orthographic projection of the recess 232. The first transition segments 8111 of the two transition layers 811 are at least partially accommodated as a whole in the recess 232.

[0164] The recess 232 provides at least partial accommodating space for the portion of the first adapter 81 that protrudes through the first through hole 231, which helps to reduce the extra space occupied by the first adapter 81 on the outside of the housing 20, improves space utilization, and thereby increases the energy density of the battery cell 6.

[0165] In some embodiments, refer to Figures 6 to 9 The first wall 23 includes a first portion 233 and a second portion 234. Along the first direction X, the second portion 234 corresponds to the recess 232. Along the first direction X, at least a portion of the second portion 234 is closer to the main body 11 than the first portion 233. The first adapter 81 is welded to the second portion 234.

[0166] In one example, refer to Figure 6 The first part 233 is directly connected to the second part 234. In another example, refer to... Figure 9 The first wall 23 also includes a third part 235, which connects the first part 233 and the second part 234. The third part 235 is bent relative to the first part 233 and the second part 234.

[0167] In one example, refer to Figure 9The second part, 234, is closer to the main body 11 than the first part, 233. In another example, refer to... Figure 6 Only a portion of the second part 234 is closer to the main body 11 than the first part 233. Along the direction from the first wall 23 to the main body 11, a portion of the second part 234 protrudes from the surface of the first part 233 near the main body 11.

[0168] In one example, the first through hole 231 extends through the second portion 234. In another example, the first through hole 231 extends through either the first portion 233 or the third portion 235.

[0169] A portion of the first adapter 81 extends out of the first through hole 231 and bends toward the second portion 234 so as to be welded to the second portion 234.

[0170] At least a portion of the second part 234 is closer to the main body 11 than the first part 233, which can increase the depth of at least a portion of the recess 232, thereby providing more accommodating space for the first adapter 81. It also helps to increase the thickness of the second part 234 and reduce the impact of the recess 232 on the structural strength of the first wall 23.

[0171] In some embodiments, refer to Figures 6 to 9 The first through hole 231 penetrates the second part 234 along the first direction X. In this way, the height difference between the position where the first adapter 81 protrudes from the first through hole 231 and the position where the first adapter 81 and the first wall 23 are welded in the first direction X can be reduced, the phenomenon of the first adapter 81 arching in the recess 232 can be reduced, the space occupied by the first adapter 81 in the first direction X in the recess 232 can be reduced, and the degree of bending of the first adapter 81 can be reduced, thus reducing the difficulty of bending and the risk of cracking.

[0172] In some embodiments, refer to Figures 6 to 8 The second part 234 includes a first sub-part 2341 and a second sub-part 2342. Along the first direction X, the first surface 2341a of the first sub-part 2341 facing away from the main body 11 is closer to the main body 11 than the second surface 2342a of the second sub-part 2342 facing away from the main body 11. The first sub-part 2341 is closer to the main body 11 than the first part 233. In the same plane perpendicular to the first direction X, the orthographic projection of the portion of the first adapter 81 housed in the recess 232 at least partially overlaps with the orthographic projection of the first sub-part 2341, and is spaced apart from the orthographic projection of the second sub-part 2342.

[0173] Along the first direction X, the thickness of the first sub-part 2341 and the thickness of the second sub-part 2342 can be the same or different.

[0174] In one example, the second sub-part 2342 is connected to the first part 233. In another example, the second sub-part 2342 and the first part 233 are connected by other parts of the first wall 23.

[0175] In one example, there are two second sub-parts 2342, located on either side of the first sub-part 2341 along the second direction Y. In another example, the second sub-parts 2342 surround the outer periphery of the first sub-part 2341.

[0176] The first sub-part 2341 is recessed to a greater extent relative to the first part 233 than the second sub-part 2342 is recessed to a greater extent relative to the first part 233, which can provide more accommodating space for the first adapter 81 in the first direction X, and reduce the extra space occupied by the first adapter 81 outside the housing 20.

[0177] The second part 234 is arranged in a stepped shape. During the formation of the recess 232, the second sub-part 2342 with a shallower recess is formed first by stamping, cutting or other means, and then the first sub-part 2341 with a deeper recess is formed by stamping, cutting or other means. This helps to reduce the forming difficulty of the recess 232 and reduce the risk of breakage during the forming of the first wall 23.

[0178] Along the first direction X, the portion of the first adapter 81 extending out of the first through hole 231 and the second sub-part 2342 do not overlap. The portion of the first adapter 81 extending out of the first through hole 231 and the second sub-part 2342 can share part of the space in the first direction X, which is beneficial to improving space utilization.

[0179] In some embodiments, refer to Figures 6 to 8 Along the first direction X, a portion of the first adapter 81 is located on the side of the second sub-part 2342 closer to the main body 11. The first part 233 includes a fourth surface 233a facing the main body 11. Along the direction from the first wall 23 to the main body 11, both the first sub-part 2341 and the second sub-part 2342 extend beyond the fourth surface 233a, and the dimension by which the second sub-part 2342 extends beyond the fourth surface 233a is smaller than the dimension by which the first sub-part 2341 extends beyond the fourth surface 233a.

[0180] The larger dimension of the first sub-part 2341 extending beyond the fourth surface 233a is beneficial for increasing the thickness of the first sub-part 2341 and reducing the impact of a greater degree of indentation of the first sub-part 2341 on the structural strength of the first wall 23. The smaller dimension of the second sub-part 2342 extending beyond the fourth surface 233a is beneficial for reducing the possibility of interference between the second sub-part 2342 and the first adapter 81 inside the housing 20.

[0181] In some embodiments, refer to Figures 6 to 8The first through hole 231 is formed by the first sub-part 2341 and the second sub-part 2342. In this way, the height difference in the first direction X between the position where the first adapter 81 protrudes from the first through hole 231 and the position where the first adapter 81 and the first wall 23 are welded can be reduced, the phenomenon of the first adapter 81 arching in the recess 232 can be reduced, the space occupied by the first adapter 81 in the first direction X in the recess 232 can be reduced, and the degree of bending of the first adapter 81 can be reduced, thereby reducing the risk of cracking of the first electrode tab 12.

[0182] Compared to the first through hole 231 being inserted through the first sub-part 2341, the first through hole 231 is formed by the first sub-part 2341 and the second sub-part 2342, which is beneficial to reduce the size of the first sub-part 2341 and reduce the impact of the setting of the first sub-part 2341 on the structural strength of the first wall 23.

[0183] In some alternative embodiments, the first through hole 231 may also extend through the first sub-part 2341.

[0184] In some embodiments, refer to Figures 6 to 8 The second part 234 includes a third sub-part 2343, which connects the first part 233 and the second sub-part 2342. Along the first direction X, the third sub-part 2343 is further away from the main body 11 than the second surface 2342a on its third surface. The battery cell 6 includes a cover 30 connected to the third surface 2343a, which covers the first through-hole 231 along the first direction X.

[0185] Optionally, along the direction from the first wall 23 to the main body 11, the cover 30 covers the portion of the first adapter 81 that extends out of the first through hole 231.

[0186] In one example, along the first direction X, the surface of the second sub-part 2342 near the main body 11 is closer to the main body 11 than the surface of the third sub-part 2343 near the main body 11. In another example, along the first direction X, the surface of the second sub-part 2342 near the main body 11 may also be flush with the surface of the third sub-part 2343 near the main body 11.

[0187] Along the direction from the first wall 23 to the main body 11, a portion of the third sub-part 2343 may extend beyond the fourth surface 233a, or the third sub-part 2343 may not extend beyond the fourth surface 233a. Optionally, along the first direction X, the surface of the third sub-part 2343 near the main body 11 is flush with the fourth surface 233a.

[0188] The connection methods between the cover 30 and the third surface 2343a include, but are not limited to, welding or bonding.

[0189] The cover 30 can be a conductive component or an insulating component.

[0190] In one example, along the direction from the main body 11 to the first wall 23, a portion of the cover 30 extends beyond the surface of the first portion 233 away from the main body 11, and the cover 30 is partially received within the recess 232. In another example, the cover 30 is entirely received within the recess 232.

[0191] The cover 30 can prevent external particles, water, and other impurities from entering the housing 20 through the first through-hole 231, causing contamination or short circuit risk. At least a portion of the cover 30 can be accommodated in the recess 232. The cover 30 and the first portion 233 share a portion of the space in the first direction X, which is beneficial to improving space utilization and increasing the energy density of the battery cell 6.

[0192] In some embodiments, refer to Figures 6 to 8 The battery cell 6 includes a first insulating member 51, which is disposed at least partially between the main body 11 and the first wall 23 along the first direction X. The first insulating member 51 has a second through hole 511 extending along the first direction X, and a first adapter 81 passes through the second through hole 511. At least a portion of the second part 234 is accommodated in the second through hole 511.

[0193] The second part 234 can be entirely accommodated within the second through hole 511, or it can be partially accommodated within the second through hole 511.

[0194] Along the direction from the first wall 23 to the main body 11, the second part 234 does not extend beyond the second through hole 511, or it may partially extend out of the second through hole 511.

[0195] The embodiments of this application utilize the space occupied by the first insulating member 51 in the first direction X within the housing 20 to accommodate at least a portion of the second part 234, which helps to reduce the additional space occupied by the second part 234 within the housing 20 and improve the space utilization rate inside the housing 20.

[0196] In some embodiments, refer to Figure 4 The first insulating member 51 includes a connecting portion 513 and at least two supporting portions 512. The at least two supporting portions 512 are spaced apart along the second direction Y, and the connecting portion 513 connects two adjacent supporting portions 512. Along the first direction X, a portion of the supporting portion 512 protrudes from the surface of the connecting portion 513 near the main body portion 11. A second through hole 511 penetrates the connecting portion 513 along the first direction X.

[0197] Optionally, the connecting part 513 and the supporting part 512 are integrally formed.

[0198] The support portion 512 is closer to the main body portion 11 than the connecting portion 513. On the one hand, an accommodating space can be formed on the side of the connecting portion 513 facing the main body portion 11 to accommodate the first electrode tab 12. The first electrode tab 12 and the first insulating member 51 share part of the space in the first direction X, which is beneficial to improve space utilization. On the other hand, the support portion 512 can be used to abut against the main body portion 11 to reduce the shaking of the main body portion 11.

[0199] Optionally, along the first direction X, the surfaces of the support portion 512 and the connecting portion 513 facing the first wall 23 are flush. The connecting portion 513, the support portion 512, and the second portion 234 can share a portion of the space in the first direction X, thereby improving space utilization.

[0200] In some embodiments, refer to Figure 10 and Figure 11 The battery cell 6 includes a first insulating member 51 and a second insulating member 52. Along the first direction X, at least a portion of the first insulating member 51 is disposed between the main body portion 11 and the first wall 23, and the second insulating member 52 is configured to fix the first insulating member 51 to the main body portion 11.

[0201] There are several ways in which the second insulating member 52 fixes the first insulating member 51 to the main body 11. The second insulating member 52 may be connected to at least one of the first insulating member 51 and the main body 11, or it may not be connected to either the first insulating member 51 or the main body 11.

[0202] For example, the second insulating member 52 is connected to the first insulating member 51 and the main body portion 11. The second insulating member 52 may be strip-shaped, U-shaped, L-shaped, ring-shaped or other shapes.

[0203] For example, the second insulating member 52 is U-shaped, surrounds the first insulating member 51 and is connected to the main body 11, thereby confining the first insulating member 51 to the side of the main body 11 near the first wall 23. The second insulating member 52 may be connected to the first insulating member 51 or may not be connected to the first insulating member 51.

[0204] For example, the second insulating member 52 is annular and surrounds the first insulating member 51 and the main body 11, tightly binding the first insulating member 51 and the main body 11 together. The second insulating member 52 may not be connected to either the first insulating member 51 or the main body 11.

[0205] The provision of the second insulating member 52 helps to limit the displacement and shaking of the first insulating member 51 within the housing 20, improving the stability of the first insulating member 51, thereby improving the insulation effect and increasing the reliability of the battery cell 6. Furthermore, the provision of the second insulating member 52 also helps to improve the insulation effect between the main body 11 and the housing 20.

[0206] In some embodiments, the second insulating member 52 is connected to at least one of the main body portion 11 and the first insulating member 51. This improves the stability of the second insulating member 52 relative to the main body portion 11 and / or the first insulating member 51, thereby enhancing the fixing effect of the second insulating member 52 on the first insulating member 51.

[0207] In one example, the second insulating member 52 is directly or indirectly connected to the main body portion 11. The connection between the second insulating member 52 and the main body portion 11 includes, but is not limited to, adhesive bonding.

[0208] In one example, the second insulating member 52 is directly or indirectly connected to the first insulating member 51. The connection between the second insulating member 52 and the first insulating member 51 includes, but is not limited to, bonding or heat fusion.

[0209] In some embodiments, refer to Figure 11 and Figure 12 The battery cell 6 includes a third insulating member 53, which covers at least a portion of the outer side of the main body 11 and is thermally fused with the first insulating member 51 to form a welded portion N. The first insulating member 51 has a first end face 51a and a side face 51b. The first end face 51a faces the first wall 23 along the first direction X, and the side face 51b intersects with the first end face 51a. A second insulating member 52 is connected to the side face 51b.

[0210] The third insulating member 53 is used to insulate and isolate the main body 11 from the outer casing 20. The third insulating member 53 covers at least two surfaces of the main body 11 along the second direction Y and two surfaces of the main body 11 along the third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. A portion of the third insulating member 53 extends beyond the main body 11 and is connected to the first insulating member 51 in the direction from the main body 11 to the first wall 23.

[0211] Optionally, the third insulating element 53 includes an insulating film.

[0212] The first end face 51a can be a single surface or include multiple surfaces.

[0213] Side surface 51b is connected to first end face 51a. Side surface 51b includes a surface of the first insulating member 51 along the second direction Y and a surface of the first insulating member 51 along the third direction Z. Second insulating member 52 may be connected to any one or more surfaces of the first insulating member 51 in the second direction Y and the third direction Z.

[0214] The second insulating element 52 is connected to the side 51b. The second insulating element 52 can be a strip, U-shaped, L-shaped or ring-shaped structure, which helps to improve the flexibility of selecting the first insulating element 51.

[0215] In some embodiments, refer to Figure 11 The support portion 512 includes a fifth surface 512a and two sixth surfaces 512b opposite each other along the second direction Y. The fifth surfaces 512a of two adjacent support portions 512 are arranged opposite each other along the third direction Z. The side surface 51b includes the fifth surface 512a and the sixth surface 512b of each support portion 512, and the second insulating member 52 is connected to at least one of the fifth surface 512a and the sixth surface 512b.

[0216] Optionally, there are two second insulating members 52, and the two second insulating members 52 are respectively connected to the two support portions 512.

[0217] In some embodiments, refer to Figure 11 The second insulating member 52 includes a first fixing part 521 and two second fixing parts 522 spaced apart along a second direction Y, which is perpendicular to the first direction X. Along the first direction X, at least a portion of the first fixing part 521 is located between the first insulating member 51 and the first wall 23. The first fixing part 521 connects to the two second fixing parts 522, and the two second fixing parts 522 are respectively connected to two opposing surfaces of the main body 11 along the second direction Y.

[0218] The first fixing part 521 may be connected to the first insulating member 51 by adhesive or other means. Alternatively, the first fixing part 521 may only contact the first insulating member 51 without being connected to it. Optionally, the first fixing part 521 may be adhesively attached to the first end face 51a.

[0219] The second fixing part 522 may be connected to the first insulating member 51 by adhesive or other means, or it may not be connected to the first insulating member 51. Optionally, the second fixing part 522 may be adhesively attached to the side surface 51b.

[0220] Along the second direction Y, a portion of the second fixing part 522 overlaps with the main body part 11. The overlapping portions of the two second fixing parts 522 and the main body part 11 may have the same or different dimensions along the first direction X.

[0221] Two second fixing parts 522 are respectively connected to the two ends of the first fixing part 521 along the second direction Y, and the second insulating member 52 is U-shaped as a whole. The second insulating member 52 is an integral structure, which helps to simplify the structure and assembly of the second insulating member 52. Both second fixing parts 522 are connected to the main body 11, and the second insulating member 52 can exert a balanced binding effect on the first insulating member 51, reducing the possibility of the first insulating member 51 shifting or tilting on either side along the second direction Y, and improving the stability of the first insulating member 51 relative to the main body 11.

[0222] In some embodiments, refer to Figure 11In the same plane perpendicular to the first direction X, the orthographic projections of the first fixing part 521 and the first through hole 231 are spaced apart. This helps to reduce interference between the first fixing part 521 and the first adapter 81, and facilitates the smooth passage of a portion of the first adapter 81 through the first wall 23.

[0223] In some embodiments, refer to Figure 12 The battery cell 6 includes a third insulating member 53, which covers at least a portion of the outer side of the main body 11 and is thermally fused with the first insulating member 51 to form a welded portion N. The first insulating member 51 has a first end face 51a and a side face 51b. The first end face 51a faces the first wall 23 along the first direction X, and the side face 51b intersects with the first end face 51a. At least a portion of the second insulating member 52 is located between the side face 51b and the third insulating member 53, and the welded portion N is spaced apart from the second insulating member 52.

[0224] The second insulating member 52 may be entirely located between the side surface 51b and the third insulating member 53, or only a portion of the second insulating member 52 may be located between the side surface 51b and the third insulating member 53. The third insulating member 53 covers at least a portion of the second insulating member 52, which helps to improve the fixing effect of the second insulating member 52 on the first insulating member 51.

[0225] The welded portion N and the second insulating member 52 are spaced apart, meaning that the welded portion N and the second insulating member 52 are separate from each other. The welded portion N and the second insulating member 52 are spaced apart along the second direction Y, or the welded portion N and the second insulating member 52 are spaced apart along the third direction Z. The third insulating member 53 is welded to the portion of the first insulating member 51 that does not overlap with the second insulating member 52.

[0226] The welded part N is spaced apart from the second insulating member 52, which can reduce the adverse effects of the heat generated during the thermal fusion connection of the third insulating member 53 and the first insulating member 51 on the second insulating member 52, reduce the risk of the second insulating member 52 being partially melted and affecting its structural strength, and also reduce the risk of the third insulating member 53 being damaged by the warping caused by the partial melting of the second insulating member 52 or causing the third insulating member 53 to warp.

[0227] In some embodiments, refer to Figures 4 to 8 The battery cell 6 includes a cover 30, which is connected to the first wall 23 and covers the first through hole 231 along the first direction X. The cover 30 can prevent external particles, water and other impurities from entering the housing 20 through the first through hole 231, causing pollution or short circuit risk.

[0228] The cover 30 can be a conductive component or an insulating component.

[0229] In some embodiments, along the first direction X, a recess 232 is provided on the side of the first wall 23 away from the main body 11, a first through hole 231 communicates with the recess 232, and a portion of the first adapter 81 and at least a portion of the cover 30 are accommodated in the recess 232.

[0230] The recess 232 provides a receiving space for the portion of the first adapter 81 that protrudes through the first through hole 231, and provides at least a partial receiving space for the cover 30. This helps to reduce the extra space occupied by the cover 30 and the first adapter 81 in the first direction X, improves space utilization, and thus increases the energy density of the battery cell 6.

[0231] In some embodiments, the cover 30 is welded to the first wall 23 and is used to connect to the busbar component.

[0232] The cover 30 includes a conductive material. The material of the cover 30 may be the same as or different from the material of the first wall 23.

[0233] The cover 30 can replace the traditional electrode terminals and be welded to the busbar component, which helps to simplify the structure of the battery cell 6 and save the space occupied by the electrode terminals. The cover 30 is welded to the first wall 23, and the electrical connection between the cover 30 and the first adapter 81 is achieved through the first wall 23, which helps to reduce the welding difficulty and improve the connection strength.

[0234] In some embodiments, refer to Figure 14 The cover 30 is used for welding to the busbar component. The battery cell 6 includes a separator 40, at least a portion of which is disposed between the cover 30 and the welded portion W along a first direction X. The thermal conductivity of the separator 40 is less than that of the cover 30.

[0235] The isolator 40 can be a conductive component or an insulating component.

[0236] The separator 40 is at least partially disposed between the welded part W and the cover 30, and the separator 40 has a low thermal conductivity. The separator 40 can reduce the heat transferred to the welded part W during the welding of the cover 30 and the busbar component, reduce the adverse effects of the welding operation of the cover 30 and the busbar component on the welded part W, and reduce the risk of cracking or breaking of the welded part W leading to the failure of the connection between the first adapter 81 and the first wall 23, thereby improving the reliability of the battery cell 6.

[0237] In some embodiments, refer to Figure 14 Along the direction from the first wall 23 to the main body 11, the spacer 40 completely covers the welded portion W. In other words, in the same plane perpendicular to the first direction X, the orthographic projection of the welded portion W lies within the orthographic projection of the spacer 40.

[0238] The orthographic projection of the welded part W and the orthographic projection of the spacer 40 can completely overlap, and the orthographic projection of the spacer 40 can also exceed the orthographic projection range of the welded part W.

[0239] The isolator 40 completely separates the welded part W from the cover 30 along the first direction X. The isolator 40 can prevent the heat generated during the welding of the cover 30 and the busbar component from being transferred to the welded part W, thereby reducing the adverse effects of the welding operation of the cover 30 and the busbar component on the welded part W.

[0240] In some embodiments, the spacer 40 is connected to at least one of the cover 30, the first adapter 81, and the welded portion W. This improves the installation stability of the spacer 40 and reduces the risk of the spacer 40 shifting or displacing and becoming completely misaligned with the welded portion W. Optionally, the spacer 40 is bonded to the first adapter 81.

[0241] In some embodiments, refer to Figure 14 The isolator 40 is connected to the first adapter 81 and / or the welded part W, and the cover 30 and the isolator 40 are spaced apart along the first direction X. This helps to reduce interference between the cover 30 and the isolator 40, reduce the adverse effect of the isolator 40 on the connection between the cover 30 and the first wall 23, and also reduce the risk of the welded part W cracking under pressure.

[0242] In other embodiments, the spacer 40 is connected to the cover 30, and the spacer 40 and the welded portion W are spaced apart along the first direction X. This helps to reduce interference between the spacer 40 and the welded portion W, reducing the risk of the welded portion W cracking under pressure. Furthermore, it can also block heat conduction between the spacer 40 and the welded portion W, reducing the efficiency of heat transfer to the welded portion W.

[0243] In some embodiments, the thermal conductivity of the insulating element 40 is less than or equal to 3.0 W / (mk). A lower thermal conductivity of the insulating element 40 helps reduce the heat transferred through it and improves its insulation performance.

[0244] In some embodiments, the melting point of the separator 40 is higher than that of the cover 30.

[0245] Alternatively, the spacer 40 may be a metal component, for example, the spacer 40 may be made of steel.

[0246] Optionally, the separator 40 can be a non-metallic component, for example, the separator 40 includes polyimide adhesive or mica, etc.

[0247] The high melting point of the isolator 40 helps reduce the risk of melting during welding of the cover 30 and the busbar component, improves the structural stability of the isolator 40, and thus improves the heat insulation effect of the isolator 40.

[0248] In some embodiments, the melting point of the separator 40 is greater than or equal to 250°C.

[0249] The high melting point of the insulating element 40 helps reduce the risk of melting after being heated, improves the structural stability of the insulating element 40, and thus improves the heat insulation effect of the insulating element 40.

[0250] In some embodiments, the housing 20 includes two second walls 24 spaced apart along a second direction Y, which is perpendicular to the first direction X. The battery cell 6 includes two first tabs 12, each first tab 12 including a plurality of first tab layers (not shown in the figure), the plurality of first tab layers of the two first tabs 12 respectively converging toward the two second walls 24.

[0251] Optionally, the second direction Y is parallel to the thickness direction of the electrode assembly 10.

[0252] In one example, refer to Figure 4 and Figure 5 The battery cell 6 includes two electrode assemblies 10, each electrode assembly 10 including a first tab 12. The first tabs 12 of the two electrode assemblies 10 are respectively led out from the main body portion 11 of the two electrode assemblies 10. The main body portions 11 of the two electrode assemblies 10 are stacked, and the stacking direction of the main body portions 11 of the two electrode assemblies 10 is perpendicular to the first direction X.

[0253] In another example, the battery cell 6 includes an electrode assembly 10, which includes two first tabs 12. Both first tabs 12 extend from the body portion 11 of the electrode assembly 10.

[0254] Multiple first electrode layers of the same first electrode tab 12 are stacked together in a direction close to the same second wall 24, and then extend in a direction gradually away from the second wall 24. The first electrode tab 12 is C-shaped in general.

[0255] The embodiment of this application adopts a C-shaped bending method for the first electrode tab 12, which can appropriately extend the length of the first electrode tab 12, so that the first electrode tab 12 has a certain redundancy of being stretched and deformed. This helps to alleviate the pulling effect on the first electrode tab 12 when the first adapter 81 passes through the first through hole 231, reduce the tensile stress on the first electrode tab 12, and reduce the risk of the first electrode tab 12 being pulled off.

[0256] The two first tabs 12 of the battery cell 6 are set separately, which helps to reduce the thickness of the individual first tabs 12 and reduce the space occupied by the first tabs 12 in the first direction X inside the housing 20, thereby improving the energy density of the battery cell 6.

[0257] In some embodiments, refer to Figure 13The battery cell 6 includes two first adapters 81, which are respectively connected to two first tabs 12. The first wall 23 is provided with two first through holes 231, through which the two first adapters 81 are respectively inserted. This simplifies the structure of the first adapters 81, reduces the assembly difficulty of the first adapters 81, and improves assembly efficiency.

[0258] In some embodiments, two first through holes 231 are spaced apart along the second direction Y, and two first adapters 81 are welded to the portion of the first wall 23 located between the two first through holes 231 along the second direction Y.

[0259] After the two first adapter pieces 81 pass through the two first through holes 231 respectively, they bend towards the portion of the first wall 23 located between the two first through holes 231. The bending shape of each first adapter piece 81 is roughly Z-shaped, which, compared with U-shaped or other bending shapes, helps to reduce the degree of bending of the first adapter piece 81, reduce the risk of cracking, and reduce the difficulty of bending.

[0260] In some embodiments, refer to Figure 13 Along the first direction X, a recess 232 is provided on the side of the first wall 23 away from the main body 11. The first wall 23 includes a first part 233 and a second part 234. The second part 234 corresponds to the recess 232 along the first direction X, and a first through hole 231 penetrates the second part 234. The second part 234 includes a first sub-part 2341 and a second sub-part 2342. Along the first direction X, the first surface 2341a of the first sub-part 2341 away from the main body 11 is closer to the main body 11 than the second surface of the second sub-part 2342 away from the main body 11. Along the second direction Y, at least a portion of the first sub-part 2341 is located between the two first through holes 231. Both first adapters 81 are welded to the portion of the first sub-part 2341 located between the two first through holes 231.

[0261] In one example, a portion of the second sub-part 2342 is located on one side of the first sub-part 2341 along the second direction Y, and another portion of the second sub-part 2342 is located on the other side of the first sub-part 2341 along the second direction Y. Both first through holes 231 are formed by the first sub-part 2341 and the second sub-part 2342. The two first through holes 231 are respectively located on both sides of the first sub-part 2341 along the second direction Y.

[0262] In another example, both first through holes 231 penetrate the first sub-part 2341.

[0263] Both first adapter parts 81 are welded to the first sub-part 2341. The first sub-part 2341 is more recessed than the second sub-part 2342, which provides more space for the two first adapter parts 81, thereby improving space utilization. The second part 234 only needs to have one first sub-part 2341 with a larger recess, which helps to reduce molding difficulty.

[0264] In some embodiments, refer to Figure 13 In the same plane perpendicular to the first direction X, the orthographic projections of the two first adapter pieces 81 are spaced apart. In this way, the two first adapter pieces 81 do not overlap in the first direction X, and can share the space on the first adapter pieces 81, thereby improving space utilization; it also helps to reduce interference between the two first adapter pieces 81 and reduce the risk of edge warping, bending deformation, and other factors that affect the welding strength of the first adapter pieces 81.

[0265] In some embodiments, refer to Figure 14 Two first adapters 81 are welded to the first wall 23 to form two welded portions W. In one example, the battery cell 6 includes two separators 40, which are respectively connected to the two first adapters 81. Along the first direction X, at least a portion of each of the two separators 40 is located between the two welded portions W and the cover 30. This reduces the size of a single separator 40 and simplifies the connection between the separator 40 and the first adapters 81.

[0266] In another example, the separator 40 is a single unit, with a portion of the separator 40 disposed between one of the welded portions W and the cover 30 along the first direction X, and another portion of the separator 40 disposed between another welded portion W and the cover 30. This simplifies the structure and assembly process of the battery cell 6.

[0267] In some embodiments, refer to Figure 4 and Figure 5 The outer casing 20 includes a third wall 25, and the main body 11 is disposed between the first wall 23 and the third wall 25 along the first direction X. The battery cell 6 includes an electrode terminal 60 disposed on the third wall 25, and the electrode assembly 10 includes a second tab 13 connected to the main body 11. The first tab 12 and the second tab 13 have opposite polarities, and the second tab 13 is electrically connected to the electrode terminal 60.

[0268] Optionally, the battery cell 6 further includes a second adapter 82, which is welded to the second tab 13 and the electrode terminal 60. The second tab 13 is electrically connected to the electrode terminal 60 through the second adapter 82. The battery cell 6 includes multiple electrode assemblies 10, and the second tabs 13 of the multiple electrode assemblies 10 are all connected to the second adapter 82, which helps to reduce the number of second adapters 82 and simplify the structure of the battery cell 6.

[0269] Alternatively, the second tab 13 is directly connected to the electrode terminal 60.

[0270] In some embodiments, refer to Figure 5 The battery cell 6 includes two second tabs 13, which are separated along a second direction Y, and the second direction Y is perpendicular to the first direction X.

[0271] In one example, refer to Figure 5 The battery cell 6 includes two electrode assemblies 10, each electrode assembly 10 including a second tab 13. The second tabs 13 of the two electrode assemblies 10 are respectively led out from the main body portion 11 of the two electrode assemblies 10. The main body portions 11 of the two electrode assemblies 10 are stacked along the second direction Y.

[0272] In another example, the battery cell 6 includes an electrode assembly 10, which includes two second tabs 13. Both second tabs 13 extend from the body portion 11 of the electrode assembly 10.

[0273] The two second tabs 13 of the battery cell 6 are set separately, which helps to reduce the thickness of the individual second tabs 13 and reduce the space occupied by the second tabs 13 in the first direction X inside the housing 20, thereby improving the energy density of the battery cell 6.

[0274] In some embodiments, refer to Figures 15 to 17 The outer casing 20 includes two second walls 24 disposed along a second direction Y, which is perpendicular to the first direction X. The battery cell 6 includes a third insulating member 53, a fourth insulating member 54, and a fifth insulating member 55. Along the first direction X, at least a portion of the fourth insulating member 54 is disposed between the main body portion 11 and the third wall 25; the third insulating member 53 covers the outer side of at least a portion of the main body portion 11 and is connected to the fourth insulating member 54; along the second direction Y, a portion of the third insulating member 53 and at least a portion of the fifth insulating member 55 are stacked between the second wall 24 and the second tab 13.

[0275] Each second wall 24 connects to the first wall 23 and the third wall 25.

[0276] The fourth insulating member 54 is used to insulate and isolate the main body 11 and the third wall 25. Optionally, the fourth insulating member 54 is a plastic part.

[0277] Along the direction from the main body 11 to the third wall 25, a portion of the third insulating member 53 extends beyond the main body 11 and is connected to the fourth insulating member 54. The connection method between the third insulating member 53 and the fourth insulating member 54 includes, but is not limited to, heat fusion or bonding.

[0278] Along the direction from the main body 11 toward the third wall 25, a portion of the third insulating member 53 extends beyond the main body 11 and is located between the second wall 24 and the second tab 13, thereby insulating and isolating the second wall 24 and the second tab 13.

[0279] Along the second direction Y, at least a portion of the fifth insulating member 55 is disposed between the second wall 24 and the second tab 13, thereby insulating and isolating the second wall 24 and the second tab 13.

[0280] Along the second direction Y, the portion of the third insulating member 53 located between the second wall 24 and the second tab 13, and the portion of the fifth insulating member 55 located between the second wall 24 and the second tab 13 are stacked.

[0281] Optionally, a portion of the third insulating member 53 extending beyond the main body 11 in the direction pointing from the main body 11 to the third wall 25 is disposed on one side of the second electrode tab 13 along the second direction Y, and another portion is disposed on the other side of the second electrode tab 13 along the second direction Y. A portion of the fifth insulating member 55 is disposed on one side of the second electrode tab 13 along the second direction Y, and another portion of the fifth insulating member 55 is disposed on the other side of the second electrode tab 13 along the second direction Y. Along the second direction Y, the portions of the third insulating member 53 and the fifth insulating member 55 located on the same side of the second electrode tab 13 are stacked.

[0282] Optionally, the fifth insulating element 55 includes an insulating film or an insulating sheet.

[0283] Both the third insulating member 53 and the fifth insulating member 55 can prevent the second tab 13 from overlapping with the second wall 24. The third insulating member 53 and the fifth insulating member 55 can form a double-layer insulation between the second wall 24 and the second tab 13, which helps to reduce the risk of short circuit caused by the second tab 13 overlapping with the second wall 24 due to warping, wrinkling or damage of either the third insulating member 53 or the fifth insulating member 55, thereby improving the reliability of the battery cell 6.

[0284] In some embodiments, along the third direction Z, the size of the fifth insulating member 55 is greater than or equal to the size of the second tab 13, and the two ends of the second tab 13 along the third direction Z do not extend beyond the fifth insulating member 55. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0285] The fifth insulating element 55 can prevent the second tab 13 from overlapping with the second wall 24 in any area of ​​the third direction Z, thereby improving the insulation and isolation effect of the fifth insulating element 55 on the second tab 13 and the second wall 24.

[0286] In some embodiments, the orthographic projection of the second tab 13 lies within the orthographic projection of the fifth insulator 55 in the same plane perpendicular to the second direction Y.

[0287] Along the second direction Y, the fifth insulating member 55 can completely cover the second tab 13, preventing any area of ​​the second tab 13 from overlapping with the second wall 24, thereby improving the insulation and isolation effect of the fifth insulating member 55 on the second tab 13 and the second wall 24.

[0288] In some embodiments, refer to Figures 15 to 17 The fifth insulating member 55 includes a first insulating portion 551 and a second insulating portion 552. Along the second direction Y, at least a portion of the first insulating portion 551 is disposed between the electrode assembly 10 and the second wall 24. Along the first direction X, at least a portion of the second insulating portion 552 is disposed between the electrode assembly 10 and the third wall 25.

[0289] Optionally, the first insulating part 551 and the second insulating part 552 are integrally formed.

[0290] Optionally, the second insulating part 552 is connected to the fourth insulating member 54. The connection method between the second insulating part 552 and the fourth insulating member 54 includes, but is not limited to, bonding or heat fusion.

[0291] Optionally, the first insulating part 551 is connected to at least one of the main body part 11, the third insulating member 53, and the fourth insulating member 54.

[0292] In one example, the fifth insulating member 55 is generally L-shaped. The fifth insulating member 55 includes a first insulating portion 551 and a second insulating portion 552. The first insulating portion 551 is disposed on either side of the second tab 13 along the second direction Y, and the second insulating portion 552 is connected to the first insulating portion 551.

[0293] In another example, the fifth insulating member 55 is U-shaped. The fifth insulating member 55 includes two first insulating portions 551 and one second insulating portion 552. The two first insulating portions 551 are respectively disposed on both sides of the second tab 13 along the second direction Y, and the second insulating portion 552 connects the two first insulating portions 551.

[0294] The first insulating part 551 insulates and isolates the electrode assembly 10 and the second wall 24. The provision of the second insulating part 552 is beneficial to increasing the insulating area of ​​the fifth insulating member 55, and also beneficial to increasing the cooperation between the fifth insulating member 55 and other structures (such as the fourth insulating member 54), and facilitates the installation and fixing of the fifth insulating member 55.

[0295] In some embodiments, refer to Figure 5 The outer casing 20 includes a casing 21 and two end caps 22. The casing 21 has casing openings 211 on both sides along the first direction X. The two end caps 22 are connected to the casing 21 and cover the two casing openings 211 respectively. The first wall 23 is one of the end caps 22, and the third wall 25 is the other end cap 22.

[0296] During assembly, firstly, the second adapter 82 is welded to the second tab 13 and the electrode terminal 60; then, the electrode assembly 10 is installed into the housing 21, and the third wall 25 and the housing 21 are welded together; after the electrode assembly 10 is installed into the housing, a portion of the first adapter 81 is passed through the first through hole 231 of the first wall 23, the first wall 23 is welded to the housing 21, and the first adapter 81 is welded to the first wall 23 (the welding order of the first wall 23 and the housing 21, and the welding order of the first adapter 81 and the first wall 23 can be interchanged); finally, the cover 30 can be connected to the first wall 23 to cover the first through hole 231.

[0297] Before welding the first wall 23 and the shell 21, the first adapter 81 is passed through the first through hole 231, which helps to reduce the assembly difficulty and improve the assembly efficiency.

[0298] In other embodiments, the housing 20 includes a housing 21 and an end cap 22. The housing 21 has a housing opening 211 on one side along the first direction X, and the end cap 22 is connected to the housing 21 and covers the housing opening 211. The third wall 25 is the end cap 22, and the housing 21 is integrally formed and includes a first wall 23.

[0299] During assembly, the second adapter 82 is first welded to the second tab 13 and the electrode terminal 60; then, the electrode assembly 10 is installed into the housing 21, and the third wall 25 and the housing 21 are welded together; during the process of inserting the electrode assembly 10 into the housing, a portion of the first adapter 81 is passed through the first through hole 231 of the first wall 23, and the first adapter 81 is welded to the first wall 23; finally, the cover 30 can be connected to the first wall 23 to cover the first through hole 231.

[0300] In some embodiments, refer to Figure 5 The housing 20 includes two fourth walls 26 arranged along a third direction Z. The fourth walls 26 connect the two second walls 24 and connect the first wall 23 and the third wall 25.

[0301] Optionally, the two second walls 24 and the two fourth walls 26 are integrally formed to form the housing 21. The first wall 23 of one of the end caps 22 is welded to the housing 21, and the third wall 25 of the other end cap 22 is welded to the housing 21.

[0302] Reference Figures 3 to 17This application provides a battery cell 6, which includes two electrode assemblies 10, a housing 20, and two first adapters 81. Each electrode assembly 10 includes a main body 11 and a first tab 12 and a second tab 13 with opposite polarities. The first tab 12 and the second tab 13 extend from both sides of the main body 11 along a first direction X, and the main body 11 is housed within the housing 20. The first tabs 12 and second tabs 13 of the two electrode assemblies 10 are separated along a second direction Y. The housing 20 includes a first wall 23 located on one side of the main body 11 along the first direction X, and the first wall 23 has two first through holes 231. The two first adapters 81 are respectively connected to the first tabs 12 of the two electrode assemblies, and the two first adapters 81 pass through the two first through holes 231. A portion of each first adapter 81 is located on the side of the first wall 23 away from the main body 11 and is welded to the first wall 23 to form a welded portion W. The first adapter 81 includes two adapter layers 811. The first tab 12 has a free end 121 away from the main body 11. The free end 121 is located between the two adapter layers 811 and is welded to the two adapter layers 811.

[0303] The transition layer 811 includes a first transition segment 8111, a second transition segment 8112, a third transition segment 8113, a first weak segment 8114, and a second weak segment 8115. The first transition segment 8111 is located on the side of the first wall 23 away from the main body 11, the second transition segment 8112 is located on the side of the first wall 23 close to the main body 11, and the third transition segment 8113 passes through the first through hole 231. The transition layer 811 has a first groove 8116 on the side of the transition layer 811 close to the main body 11 along the first direction X, and a second groove 8117 on the side of the transition layer 811 away from the main body 11 along the first direction X. The first weak segment 8114 corresponds to the first groove 8116 and connects the first transition segment 8111 and the third transition segment 8113. The second weak segment 8115 corresponds to the second groove 8117 and connects the second transition segment 8112 and the third transition segment 8113.

[0304] According to a second aspect of this application, embodiments of this application also provide a battery device 2, referring to... Figure 2 The battery device 2 includes a battery cell 6 provided according to any embodiment of the first aspect of this application.

[0305] According to a third aspect of this application, embodiments of this application also provide an electrical device, which includes a battery device 2 provided according to any embodiment of the second aspect of this application, the battery device 2 being used to provide electrical energy.

[0306] 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: An electrode assembly includes a main body and a first electrode tab connected to the main body; A housing, wherein the main body is housed within the housing, the housing including a first wall located on one side of the main body along a first direction, the first wall having a first through hole; and A first adapter is connected to the first electrode tab. The first adapter passes through the first through hole. A portion of the first adapter is located on the side of the first wall away from the main body and is welded to the first wall to form a welded part.

2. The battery cell according to claim 1, characterized in that, The first electrode has a free end away from the main body, and along the first direction, a portion of the first adapter is located on the side of the free end closer to the main body.

3. The battery cell according to claim 1 or 2, characterized in that, The first adapter includes two adapter layers, and the first tab has a free end away from the main body. The free end is disposed between the two adapter layers and welded to the two adapter layers.

4. The battery cell according to claim 3, characterized in that, Each of the aforementioned transition layers passes through the first through hole. Each transition layer includes a first transition segment, which is located on the side of the first wall away from the main body. The first transition segments of the two transition layers are stacked and welded to the first wall.

5. The battery cell according to claim 3, characterized in that, The transition layer includes a first transition segment, a second transition segment, a third transition segment, a first weak segment, and a second weak segment. The first transition segment is located on the side of the first wall away from the main body, the second transition segment is located on the side of the first wall close to the main body, and the third transition segment passes through the first through hole. The transition layer has a first groove on the side closer to the main body along the first direction, and a second groove on the side away from the main body along the first direction. The first weak segment corresponds to the first groove and connects the first transition segment and the third transition segment. The second weak segment corresponds to the second groove and connects the second transition segment and the third transition segment.

6. The battery cell according to claim 5, characterized in that, Along the arrangement direction of the second transition section and the second weak section, the free end is spaced apart from the second weak section.

7. The battery cell according to claim 5, characterized in that, The battery cell includes a first insulating member. Along the first direction, at least a portion of the first insulating member is disposed between the first wall and the main body. The first insulating member has a second through hole that penetrates the first insulating member along the first direction. The first adapter is disposed through the second through hole. Along the first direction, the second transition segment of one of the transition layers is located on the side of the free end away from the main body and is at least partially accommodated in the second through hole.

8. The battery cell according to claim 3, characterized in that, The two transition layers have the same thickness.

9. The battery cell according to claim 1, characterized in that, Along the first direction, a recess is provided on the side of the first wall away from the main body, and a portion of the first adapter is accommodated in the recess.

10. The battery cell according to claim 9, characterized in that, The first wall includes a first portion and a second portion. Along the first direction, the second portion corresponds to the recess. At least a portion of the second portion is closer to the main body than the first portion. The first adapter is welded to the second portion.

11. The battery cell according to claim 10, characterized in that, The first through hole penetrates the second portion along the first direction.

12. The battery cell according to claim 10 or 11, characterized in that, The second part includes a first sub-part and a second sub-part. Along the first direction, the first sub-part is closer to the main body than the second sub-part is closer to the main body than the second sub-part is closer to the main body. In the same plane perpendicular to the first direction, the orthographic projection of the portion of the first adapter housed in the recess at least partially overlaps with the orthographic projection of the first sub-part, and is spaced apart from the orthographic projection of the second sub-part.

13. The battery cell according to claim 12, characterized in that, Along the first direction, a portion of the first adapter is located on the side of the second sub-part closer to the main body; The first portion includes a fourth surface facing the main body portion, pointing in a direction along the first wall toward the main body portion, and both the first sub-part and the second sub-part extend beyond the fourth surface, wherein the dimension by which the second sub-part extends beyond the fourth surface is smaller than the dimension by which the first sub-part extends beyond the fourth surface.

14. The battery cell according to claim 12, characterized in that, The first through hole is formed by the first sub-part and the second sub-part.

15. The battery cell according to claim 12, characterized in that, The second part includes a third sub-part that connects the first part and the second sub-part. Along the first direction, the third surface of the third sub-part is further away from the main body than the second surface. The battery cell includes a cover attached to the third surface, and the cover covers the first through hole along the first direction.

16. The battery cell according to claim 10, characterized in that, The battery cell includes a first insulating member, and at least a portion of the first insulating member is disposed between the main body and the first wall along the first direction; The first insulating member has a second through hole extending along the first direction, the first adapter is disposed in the second through hole, and at least a portion of the second part is accommodated in the second through hole.

17. The battery cell according to claim 1, characterized in that, The battery cell includes a first insulating member and a second insulating member. Along the first direction, at least a portion of the first insulating member is disposed between the main body and the first wall, and the second insulating member is configured to fix the first insulating member to the main body.

18. The battery cell according to claim 17, characterized in that, The second insulating member includes a first fixing part and two second fixing parts spaced apart along a second direction, the second direction being perpendicular to the first direction. Along the first direction, at least a portion of the first fixing part is located between the first insulating member and the first wall. The first fixing part connects to the two second fixing parts, and the two second fixing parts are respectively connected to two opposing surfaces of the main body along the second direction.

19. The battery cell according to claim 18, characterized in that, In the same plane perpendicular to the first direction, the orthographic projection of the first fixing part and the orthographic projection of the first through hole are spaced apart.

20. The battery cell according to claim 17, characterized in that, The battery cell includes a third insulating member, which covers at least a portion of the outer side of the main body and is thermally fused with the first insulating member to form a welded portion; The first insulating member has a first end face and a side face, the first end face faces the first wall along the first direction, the side face intersects with the first end face, at least a portion of the second insulating member is located between the side face and the third insulating member, and the welded portion is spaced apart from the second insulating member.

21. The battery cell according to claim 1, characterized in that, The battery cell includes a cover, which is connected to the first wall and covers the first through hole along the first direction.

22. The battery cell according to claim 21, characterized in that, Along the first direction, a recess is provided on the side of the first wall away from the main body, the first through hole communicates with the recess, and a portion of the first adapter and at least a portion of the cover are accommodated in the recess.

23. The battery cell according to claim 21 or 22, characterized in that, The cover is welded to the first wall and is used to connect to the busbar component.

24. The battery cell according to claim 23, characterized in that, The cover is used for welding to the busbar component; The battery cell includes a separator, and at least a portion of the separator is disposed between the cover and the welded portion along the first direction. The thermal conductivity of the separator is less than that of the cover.

25. The battery cell according to claim 24, characterized in that, Along the direction from the first wall toward the main body, the spacer completely covers the welded portion.

26. The battery cell according to claim 24, characterized in that, The melting point of the insulating element is higher than that of the covering element.

27. The battery cell according to claim 1, characterized in that, The outer casing includes two second walls spaced apart along a second direction, the second direction being perpendicular to the first direction. The battery cell includes two first tabs, each first tab including multiple first tab layers, the multiple first tab layers of the two first tabs respectively converging toward the two second walls.

28. The battery cell according to claim 27, characterized in that, The battery cell includes two first adapters, and the two first adapters are respectively connected to two first tabs; The first wall is provided with two first through holes, and the two first adapters are respectively inserted through the two first through holes.

29. The battery cell according to claim 28, characterized in that, The two first through holes are spaced apart along the second direction, and the two first adapters are welded to the portion of the first wall located between the two first through holes along the second direction.

30. The battery cell according to claim 29, characterized in that, Along the first direction, a recess is provided on the side of the first wall away from the main body. The first wall includes a first part and a second part. The second part corresponds to the recess along the first direction, and the first through hole penetrates the second part. The second part includes a first sub-part and a second sub-part. Along the first direction, the first sub-part is closer to the main body than the second sub-part is closer to the main body than the second sub-part is away from the main body. Along the second direction, at least a portion of the first sub-part is located between two first through holes. Both first adapters are welded to the portion of the first sub-part located between the two first through holes.

31. The battery cell according to claim 28, characterized in that, The orthographic projections of the two first adapters are spaced apart in the same plane perpendicular to the first direction.

32. The battery cell according to claim 1, characterized in that, The outer casing includes a third wall, and along the first direction, the main body portion is disposed between the first wall and the third wall; The battery cell includes an electrode terminal disposed on the third wall, and the electrode assembly includes a second tab connected to the main body. The first tab and the second tab have opposite polarities, and the second tab is electrically connected to the electrode terminal.

33. The battery cell according to claim 32, characterized in that, The battery cell includes two second tabs, which are separated along a second direction, which is perpendicular to the first direction.

34. The battery cell according to claim 32 or 33, characterized in that, The outer casing includes two second walls disposed along a second direction, the second direction being perpendicular to the first direction; The battery cell includes a third insulating member, a fourth insulating member, and a fifth insulating member. Along the first direction, at least a portion of the fourth insulating member is disposed between the main body and the third wall. The third insulating member covers the outer side of at least a portion of the main body and is connected to the fourth insulating member. Along the second direction, a portion of the third insulating member and at least a portion of the fifth insulating member are stacked between the second wall and the second tab.

35. The battery cell according to claim 34, characterized in that, Along the third direction, the size of the fifth insulating member is greater than or equal to the size of the second electrode tab, and the two ends of the second electrode tab along the third direction do not extend beyond the fifth insulating member; The first direction, the second direction, and the third direction are perpendicular to each other.

36. The battery cell according to claim 34, characterized in that, In the same plane perpendicular to the second direction, the orthographic projection of the second electrode lies within the orthographic projection of the fifth insulating element.

37. The battery cell according to claim 34, characterized in that, The fifth insulating member includes a first insulating portion and a second insulating portion. Along the second direction, at least a portion of the first insulating portion is disposed between the electrode assembly and the second wall. Along the first direction, at least a portion of the second insulating portion is disposed between the electrode assembly and the third wall.

38. The battery cell according to claim 32, characterized in that, The outer casing includes a housing and an end cap, the housing having an opening on one side along the first direction, and the end cap being connected to the housing and covering the opening; The third wall is the end cap, and the housing is integrally formed and includes the first wall.

39. The battery cell according to claim 32, characterized in that, The outer casing includes a housing and two end caps. The housing has openings on both sides along the first direction, and the two end caps are connected to the housing and respectively cover the two openings. The first wall is one of the end caps, and the third wall is the other end cap.

40. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-39.

41. An electrical appliance, characterized in that, Includes the battery device according to claim 40, the battery device being used to provide electrical energy.

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