Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell, an electrode unit and an electrode terminal. The shell comprises a first wall and a second wall arranged along a first direction, and the first wall is provided with a first through hole. The electrode unit comprises a main body part, and a first conductive part and a second conductive part with opposite polarities, along the first direction, the main body part is arranged between the first wall and the second wall, the first conductive part is led out from one side of the main body part close to the first wall, the second conductive part is led out from one side of the main body part close to the second wall, the first conductive part is arranged in the first through hole, and a part of the first conductive part is located on one side of the first wall away from the main body part and is welded on one side of the first wall away from the main body part. The electrode terminal is arranged on the second wall, and the second conductive part is electrically connected to the electrode terminal. The application is beneficial to improving the energy density, simplifying the structure of the battery monomer, reducing the welding difficulty and reducing the damage of the welding operation to the first conductive part.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to PCT application No. PCT / CN2025 / 145272, 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, improving the energy density of individual battery cells and simplifying their structure are research directions. Utility Model Content

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

[0007] According to a first aspect of this application, a battery cell is provided, comprising a housing, an electrode unit, and electrode terminals. The housing includes a first wall and a second wall disposed along a first direction, the first wall having a first through hole. The electrode unit includes a main body portion and a first conductive portion and a second conductive portion with opposite polarities. Along the first direction, the main body portion is disposed between the first wall and the second wall. The first conductive portion extends from the side of the main body portion near the first wall, and the second conductive portion extends from the side of the main body portion near the second wall. The first conductive portion passes through the first through hole, and a portion of the first conductive portion is located on the side of the first wall away from the main body portion and is welded to the side of the first wall opposite to the main body portion. Electrode terminals are disposed on the second wall, and the second conductive portion is electrically connected to the electrode terminals.

[0008] In the battery cell provided in this application embodiment, a portion of the first conductive part extends out of the outer casing through the first through hole and is welded to the first wall. On the one hand, this can reduce the space occupied by the first conductive part inside the outer casing, which is beneficial to improving the energy density of the battery cell. On the other hand, the first conductive part is directly welded to the first wall outside the outer casing, which can eliminate a traditional electrode terminal, thereby simplifying the structure of the battery cell, reducing the welding difficulty, reducing the damage to the first conductive part caused by the welding operation, and also reducing the risk of welding particles falling into the outer casing and causing a short circuit.

[0009] 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. A first through hole communicates with the recess. The portion of the first conductive part located on the side of the first wall away from the main body is an extension of the first conductive part. At least a portion of the extension is accommodated in the recess and welded to the second portion. The recess provides at least partial accommodating space for the extension. The first conductive part and the first wall share a portion of the space in the first direction, which can reduce the additional space occupied by the first conductive part on the outside of the casing, thereby improving the energy density of the battery cell.

[0010] In some embodiments, the orthographic projection of the protruding segment lies within the orthographic projection of the second portion in the same plane perpendicular to the first direction. Along the first direction, the protruding segment does not overlap with the first portion, and there is no thickness overlap between the protruding segment and the first portion, which is beneficial for improving space utilization in the first direction.

[0011] In some embodiments, the protrusion is entirely housed within the recess. Along the first direction, the protrusion does not protrude from the recess, and the protrusion does not occupy additional space outside the casing, which is beneficial for improving the energy density of the battery cell.

[0012] 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 conductive part emerges from the first through hole and the position where the first conductive part and the first wall are welded, reduces the phenomenon of the first conductive part arching in the recess, reduces the space occupied by the first conductive part in the first direction in the recess, and also reduces the degree of bending of the first conductive part, thereby reducing the risk of cracking of the first conductive part.

[0013] In some embodiments, the second portion includes a first sub-part and a second sub-part. Along a 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. The protruding section is welded to the first sub-part. Compared to the portion of the recess corresponding to the second sub-part, the portion of the recess corresponding to the first sub-part is more recessed, providing more accommodating space for the protruding section and the welded portion in the first direction, reducing the size of the protruding section and the welded portion protruding from the recess along the first direction, thereby reducing the additional space occupied by the protruding section and the welded portion.

[0014] In some embodiments, the orthographic projections of the extended segment and the second sub-segment are spaced apart in the same plane perpendicular to the first direction. The extended segment and the second sub-segment do not overlap along the first direction, and they can share a portion of the space along the first direction, which helps improve space utilization.

[0015] In some embodiments, the first through-hole is formed by a first sub-part and a second sub-part. This reduces the height difference in the first direction between the point where the first conductive part protrudes from the first through-hole and the point where the first conductive part is welded to the first wall, reduces the arching of the protruding section within the recess, reduces the space occupied by the protruding section within the recess in the first direction, and also reduces the degree of bending of the first conductive part, lowering the risk of cracking. Compared to the first through-hole being located within the first sub-part, the first through-hole being formed 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.

[0016] 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 attached to the third surface, covering a first through-hole along the 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. At least a portion of the cover can be accommodated within a recess, and the cover shares a portion of the space along the first direction with the first portion, which improves space utilization and increases the energy density of the battery cell.

[0017] In some embodiments, along a first direction, the first portion includes a fourth surface facing the main body, and along the direction from the first wall toward the main body, the second portion at least partially protrudes from the fourth surface. This facilitates increasing the thickness of the second portion, reducing the impact of the recess on the structural strength of the first wall, and lowering the risk of deformation of the first wall.

[0018] In some embodiments, the second portion includes a first sub-part and a second sub-part. Along a 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 sub-part, which includes a second surface facing away from the main body. The protruding section is welded to the first sub-part to form a welded portion. Along the direction from the first wall to the main body, the first sub-part at least partially protrudes from a fourth surface. This is advantageous because it increases the thickness of the first sub-part along the first direction by increasing the degree of recess of the recess corresponding to the first sub-part, thereby providing more accommodating space for the protruding section in the first direction and reducing the adverse effects on the structural strength of the first wall.

[0019] In some embodiments, along a first direction, a portion of the first conductive portion is located on the side of the second sub-portion closer to the main body; along the direction from the first wall to the main body, at least a portion of the second sub-portion protrudes from the fourth surface, and the size of the second sub-portion protruding from the fourth surface is smaller than the size of the first sub-portion protruding from the fourth surface. The smaller size of the second sub-portion protruding from the fourth surface also helps to reduce the risk of interference between the second sub-portion and the first conductive portion, and minimizes any adverse effects on the first conductive portion.

[0020] In some embodiments, the first conductive portion includes a first tab and a first adapter portion. The first tab is connected to the main body, and the first adapter portion is welded to the first tab. The first adapter portion passes through a first through hole and is welded to a first sub-part. In the same plane perpendicular to the first direction, the orthographic projection of the portion of the first adapter portion housed in the recess is spaced apart from the orthographic projection of the second sub-part. The orthographic projection of the portion of the first adapter portion located on the side of the first wall near the main body is also spaced apart from the orthographic projection of the first sub-part. The portion of the first adapter portion extending out of the first through hole does not have thickness overlap with the second sub-part, allowing them to share some space in the first direction, which is beneficial for improving space utilization. Inserting the first adapter portion through the first through hole helps reduce assembly difficulty, decreases interference between the first tab and the first wall, and reduces the risk of the first tab cracking due to stress concentration.

[0021] 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 conductive portion passing through the second through hole, and at least a portion of the second part being accommodated in the second through hole. The portion of the second part protruding from the fourth surface shares at least a portion of the space in the first direction with the first insulating member, which helps to reduce the additional space occupied by the second part within the casing and improve space utilization.

[0022] 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. The second insulating member is configured to fix the first insulating member to the main body. The provision of the second insulating member helps to limit 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.

[0023] In some embodiments, the second insulating member is connected to at least one of the main body and the first insulating member. This improves the stability of the second insulating member relative to the main body and / or the first insulating member, thereby enhancing the fixing effect of the second insulating member on the first insulating member.

[0024] 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 is an integral structure, which simplifies its structure and assembly. Both second fixing portions are connected to the main body, and the second insulating member can exert a balanced restraining effect on the first insulating member, reducing the possibility of displacement or warping of the first insulating member along either side of the second direction, and improving the stability of the first insulating member relative to the main body.

[0025] In some embodiments, the orthographic projections of the first fixing portion 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 portion and the first conductive portion, and facilitates the smooth passage of a portion of the first conductive portion through the first wall.

[0026] 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. The spaced distance between the welded portion and the second insulating member reduces the adverse effects of heat generated during the thermal fusion of the third and first insulating members on the second insulating member, reduces 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.

[0027] 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.

[0028] 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 conductive part and at least a portion of the cover are accommodated in the recess. The recess provides accommodating space for the portion of the first conductive part that protrudes from the first through hole and provides at least partial accommodating space for the cover, which helps to reduce the additional space occupied by the cover and the first conductive part in the first direction, improves the space utilization rate in the first direction, and thereby increases the energy density of the battery cell.

[0029] 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 conductive part, reducing welding difficulty and improving connection strength.

[0030] In some embodiments, the cover is used for welding to the busbar component; the first conductive portion is welded to the side of the first wall opposite to the main body and forms a weld portion. The battery cell includes a separator, at least a portion of which is disposed between the cover and the weld portion along a first direction. The thermal conductivity of the separator is lower than that of the cover. The lower thermal conductivity of the separator reduces the heat transferred to the weld portion during welding of the cover and the busbar component, reduces the adverse effects of welding operations on the weld portion, and lowers the risk of cracking or breakage of the weld portion leading to connection failure of the first conductive portion and the first wall, thereby improving the reliability of the battery cell.

[0031] 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.

[0032] 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.

[0033] In some embodiments, the battery cell includes two first conductive portions and two first through holes in the first wall, with the two first conductive portions respectively passing through the two first through holes. The separate arrangement of the two first conductive portions in the battery cell helps to reduce the thickness of a single first conductive portion and reduce the space occupied by the first conductive portion in the first direction inside the casing, thereby increasing the energy density of the battery cell.

[0034] In some embodiments, the outer casing includes two third walls disposed along a second direction perpendicular to the first direction; the first conductive portion includes a first tab, the first tab including multiple first tab layers, the first tab layers of two first conductive portions respectively converging toward the two third walls. This embodiment employs a C-shaped bending method for the first tab, which extends the overall length of the first tab, giving it a certain redundancy for stretching deformation. This helps alleviate the pulling effect on the first tab when the first conductive portion passes through the first through hole, reducing the tensile stress on the first tab and lowering the risk of the first tab breaking.

[0035] In some embodiments, two first conductive portions are disposed along a second direction, and two first through holes are spaced apart along the second direction, which is perpendicular to the first direction. Both first conductive portions are welded to the portion of the first wall located between the two first through holes. The bending shape of each first conductive portion is approximately U-shaped, which, compared to U-shaped or other bending shapes, helps to reduce the degree of bending of the first conductive portion and lowers the risk of cracking.

[0036] 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 conductive parts 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 conductive parts, thereby improving space utilization. The second portion only needs to have one first sub-part with a greater degree of recess, which helps to reduce molding difficulty.

[0037] In some embodiments, the orthographic projections of two first conductive parts are spaced apart in the same plane perpendicular to the first direction. This prevents the two first conductive parts 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 conductive parts, lowering the risk of edge warping, bending deformation, and other factors affecting welding strength.

[0038] In some embodiments, the first conductive portion includes a first tab and a first adapter portion. The first tab is connected to the main body, and the first adapter portion is welded to the first tab. The first adapter portion passes through a first through hole, and a portion of the first adapter portion is located on the side of the first wall away from the main body and is welded to the first wall. In this embodiment, the first adapter portion passes through the first through hole, which helps reduce assembly difficulty, reduces interference between the first tab and the first wall, and reduces the risk of the first tab cracking due to stress concentration.

[0039] In some embodiments, the first electrode tab is integrally disposed on the side of the first wall near the main body. The first electrode tab does not pass through the first through hole, which helps to reduce the number of bends of the first electrode tab, reduce the interference between the first electrode tab and the first wall, and reduce the risk of local stress concentration and cracking of the first electrode tab.

[0040] In some embodiments, the first adapter portion includes two adapter layers, with the end of the first electrode tab furthest from the main body disposed between the two adapter layers and welded to them. The two adapter layers provide constraint and protection for the first electrode tab, which helps reduce the risk of a short circuit caused by the end of the first electrode tab furthest from the main body being inserted backwards into the main body. Welding the first electrode tab between the two adapter layers improves welding strength and stability, and reduces damage to the first electrode tab caused by welding heat.

[0041] In some embodiments, the two transition layers are stacked and welded to the first wall on the side of the first wall away from the main body. This improves the weld strength and stability.

[0042] In some embodiments, the first conductive portion includes a first tab, which is disposed in a first through hole, and a portion of the first tab is located on the side of the first wall away from the main body and is welded to the first wall.

[0043] In some embodiments, the second conductive portion includes a second tab connected to the main body portion; the battery cell includes two second conductive portions, with the second tabs of the two second conductive portions being separately disposed along a second direction perpendicular to the first direction. This facilitates reducing the thickness of a single second conductive portion and reducing the space occupied by the second conductive portion in the first direction within the casing, thereby increasing the energy density of the battery cell.

[0044] In some embodiments, the second conductive portion includes a second tab connected to the main body portion; the battery cell includes an adapter that connects the second tab and the electrode terminal.

[0045] In some embodiments, the housing includes two third 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 portion and the second wall; the third insulating member covers the outer side of at least a portion of the main body portion 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 third wall and the second conductive portion. Both the third and fifth insulating members can prevent the second conductive portion from overlapping with the third wall, and the third and fifth insulating members can form a double-layer insulation barrier between the third wall and the second conductive portion. This helps reduce the risk of a short circuit caused by the second conductive portion overlapping with the third wall due to warping, wrinkling, or damage to either the third or fifth insulating member, thereby improving the reliability of the battery cell.

[0046] 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 conductive portion, and both ends of the second conductive portion along the third direction do not extend beyond the second insulating member; the first direction, the second direction, and the third direction are perpendicular to each other. The fifth insulating member can prevent the second conductive portion from overlapping with the third wall in any region along the third direction, thereby improving the insulation effect.

[0047] In some embodiments, in the same plane perpendicular to the second direction, the orthographic projection of the second conductive portion lies within the orthographic projection of the fifth insulating member. Along the second direction, the fifth insulating member can completely cover the second conductive portion, preventing any area of ​​the second conductive portion from overlapping with the third wall, thereby improving the insulation effect.

[0048] 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 unit and the third wall. Along a first direction, at least a portion of the second insulating portion is disposed between the electrode unit and the second wall. The first insulating portion insulates and isolates the electrode unit and the third wall. The provision of the second insulating portion facilitates increasing the insulating area of ​​the fifth insulating member and also facilitates the cooperation between the fifth insulating member and other structures (such as the fourth insulating member), thus simplifying the installation and fixation of the fifth insulating member.

[0049] 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 second wall is the end cap, and the housing is integrally formed and includes the first wall.

[0050] 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 second wall is the other end cap.

[0051] 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.

[0052] 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

[0053] 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.

[0054] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0055] Figure 2 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0056] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0057] Figure 4 yes Figure 3 An exploded view of the battery cell shown.

[0058] Figure 5 yes Figure 3 The cross-sectional view of the battery cell shown.

[0059] Figure 6 yes Figure 5 A magnified view of region A in the middle.

[0060] Figure 7 yes Figure 6 A magnified view of region C in the middle.

[0061] Figure 8 This is a partial cross-sectional view of a battery cell provided in other embodiments of this application.

[0062] Figure 9 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application.

[0063] Figure 10 yes Figure 9 A magnified schematic diagram of region D in the middle.

[0064] Figure 11 yes Figure 9 The diagram shows the partial structure and the structure after the third insulating component is assembled.

[0065] Figure 12 yes Figure 5 A magnified view of region B in the middle.

[0066] Figure 13 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application.

[0067] Figure 14 This is an exploded view of a battery cell provided in some embodiments of this application.

[0068] Figure 15 yes Figure 14 A partial structural diagram of a single battery cell is shown.

[0069] Figure 16 yes Figure 14 The cross-sectional view of the battery cell shown.

[0070] Figure 17 yes Figure 16 A magnified view of region E in the middle.

[0071] The attached figures are labeled as follows:

[0072] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor.

[0073] 5. Box body, 5a. First box body section, 5b. Second box body section, 5c. Accommodation space;

[0074] 6. Battery cell; 10. Electrode unit; 11. Main body; 12. First conductive part; 121. First tab; 122. First adapter; 1221. Adapter layer; 12a. Extended section; 13. Second conductive part; 131. 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 Parts, 24, second wall, 25, third wall, 26, fourth wall, 30, cover, 40, isolation member, 51, first insulating member, 511, second through hole, 512, support part, 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, 80, adapter, N, welding part, W, welding part, X, first direction, Y, second direction, Z, third direction. Detailed Implementation

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] In this application, "multiple" means two or more (including two).

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] In some implementations, the isolation structure is positioned between the positive and negative electrodes.

[0090] 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.

[0091] 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.

[0092] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0093] In some embodiments, the electrode assembly has a stacked structure.

[0094] 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.

[0095] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0100] The electrode assembly typically includes a main body and a first electrode tab and a second electrode tab with opposite polarities. The first electrode tab and the second electrode tab are respectively connected to a first electrode terminal and a second electrode terminal on the outer casing wall via a first adapter and a second adapter. The first electrode tab and the second electrode tab can be led out from the same side of the main body or from different sides of the main body.

[0101] When the first and second tabs are led out from opposite sides of the main body, they occupy part of the space inside the casing, resulting in low space utilization and affecting the energy density of the battery cell. Furthermore, during assembly, the second adapter is usually pre-welded to the second tab and the second electrode terminal before the entire assembly is inserted into the casing. After insertion, the first adapter is then welded to the first tab and the first electrode terminal. However, due to process limitations, welding the first adapter and the first electrode terminal is difficult and can easily burn the first tab, affecting the assembly efficiency and reliability of the battery cell.

[0102] In view of this, the present application provides a technical solution in which a second conductive part (which may only include the second tab or may include the second tab and the second adapter) extending from one side of the main body along the first direction is electrically connected to the electrode terminal, and a first conductive part (which may only include the first tab or may include the first tab and the first adapter) extending from the other side of the main body along the first direction is inserted through a through hole in the first wall of the outer casing. A portion of the first conductive part extends out of the outer casing and is welded to the first wall. On the one hand, the space occupied by the first conductive part inside the outer casing can be reduced, thereby increasing the energy density. On the other hand, the first conductive part is directly welded to the first wall outside the outer casing, which can eliminate a traditional electrode terminal, thereby simplifying the structure of the battery cell, reducing welding difficulty, reducing welding damage, and also helping to reduce the risk of welding particles falling into the outer casing and causing a short circuit.

[0103] The technical solutions provided in this application are applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0104] 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.

[0105] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0106] 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.

[0107] 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.

[0108] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application. (Refer to...) Figure 2 The 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.

[0113] Figure 3 These are schematic diagrams of the structure of a single battery cell provided in some embodiments of this application. Figure 4 yes Figure 3 An exploded view of the battery cell shown. (Refer to...) Figure 3 and Figure 4The battery cell 6 includes an electrode unit 10 and a housing 20, with a portion of the electrode unit 10 disposed within the housing 20.

[0114] The outer casing 20 is used to encapsulate the electrode unit 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.

[0115] In some embodiments, the outer casing 20 is a hollow structure, with an internal space for accommodating the electrode unit 10 and the electrolyte. The shape of the outer casing 20 can be determined according to the specific shape of the electrode unit 10. For example, if the electrode unit 10 has a cuboid structure, a cuboid outer casing can be used.

[0116] 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.

[0117] 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.

[0118] 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 unit 10, the electrolyte, and other components.

[0119] 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.

[0120] 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.

[0121] The end cap 22 can be connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0122] 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.

[0123] 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 other embodiments of this application. Figure 9 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application. Figure 10 yes Figure 9 An enlarged schematic diagram of region D in the middle. Figure 11 yes Figure 9 The diagram shows the partial structure and the structure after the third insulating component is assembled. Figure 12 yes Figure 5 An enlarged schematic diagram of region B in the middle. Figure 13 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application. Figure 14 This is an exploded view of a battery cell provided in some embodiments of this application. Figure 15 yes Figure 14 A partial structural diagram of a single battery cell is shown. Figure 16 yes Figure 12 The cross-sectional view of the battery cell shown. Figure 17 yes Figure 16 A magnified view of region E in the middle.

[0124] Reference Figures 4 to 17 The battery cell 6 provided in this application embodiment includes an electrode unit 10, a housing 20, and electrode terminals 60. The housing 20 includes a first wall 23 and a second wall 24 disposed along a first direction X, and the first wall 23 has a first through hole 231. The electrode unit 10 includes a main body 11 and a first conductive part 12 and a second conductive part 13 with opposite polarities. Along the first direction X, the main body 11 is disposed between the first wall 23 and the second wall 24. The first conductive part 12 extends from the side of the main body 11 near the first wall 23, and the second conductive part 13 extends from the side of the main body 11 near the second wall 24. The first conductive part 12 passes through the first through hole 231, and a portion of the first conductive part 12 is located on the side of the first wall 23 away from the main body 11 and is welded to the side of the first wall 23 opposite to the main body 11. The electrode terminals 60 are disposed on the second wall 24, and the second conductive part 13 is electrically connected to the electrode terminals 60.

[0125] 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 5 In the embodiment shown, the first wall 23 is an end cap 22.

[0126] The second wall 24 can be one of the walls of the housing 21, or it can be an end cap 22. Optionally, in Figure 5 In the embodiment shown, the second wall 24 is an end cap 22.

[0127] 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.

[0128] 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, with its length direction parallel to the width direction of the first conductive part 12, and the width direction of the first conductive part 12 perpendicular to its extension direction from the main body 11. In this way, the area of ​​the first through hole 231 can be reduced while allowing the first conductive part 12 to pass through.

[0129] The first conductive part 12 and the second conductive part 13 are both power output structures of the electrode unit 10. One of the first conductive part 12 and the second conductive part 13 is the positive electrode output structure of the electrode unit 10, and the other is the negative electrode output structure of the electrode unit 10.

[0130] The first conductive portion 12 includes at least a first tab 121, which is connected to the main body portion 11. Optionally, the first conductive portion 12 may further include a transition portion connected to the first tab 121.

[0131] The second conductive part 13 includes at least a second tab 131, which is connected to the main body part 11. Optionally, the second conductive part 13 may also include a transition part connected to the first tab 121.

[0132] 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.

[0133] In one example, the first tab 121 is a positive tab, connected to the positive current collector. The second tab 131 is a negative tab, connected to the negative current collector. Optionally, the first tab 121 is integrally formed with the positive current collector, and the second tab 131 is integrally formed with the negative current collector.

[0134] In another example, the first tab 121 is a negative tab, connected to the negative current collector. The second tab 131 is a positive tab, connected to the positive current collector. Optionally, the first tab 121 is integrally formed with the negative current collector. The second tab 131 is integrally formed with the positive current collector.

[0135] The second conductive part 13 is directly connected to the electrode terminal 60, or the second conductive part 13 is indirectly connected to the electrode terminal 60 through an intermediate component, so as to establish an electrical connection with the electrode terminal 60 through the intermediate component.

[0136] The portion of the first conductive part 12 that extends from the first through hole 231 is bent toward the surface of the first wall 23 away from the main body 11, so as to be welded to the first wall 23. The welding method of the first conductive part 12 and the first wall 23 includes, but is not limited to, laser, ultrasonic, etc. During welding, a portion of the first conductive part 12 and a portion of the first wall 23 are heated and melted together to form a welded part W.

[0137] In the battery cell 6 provided in this application embodiment, a portion of the first conductive part 12 extends out of the outer casing 20 through the first through hole 231 and is welded to the first wall 23. On the one hand, this can reduce the space occupied by the first conductive part 12 inside the outer casing 20, which is beneficial to improving the energy density of the battery cell 6. On the other hand, the first conductive part 12 is directly welded to the first wall 23 outside the outer casing 20, which can eliminate a traditional electrode terminal, thereby simplifying the structure of the battery cell 6, reducing the welding difficulty, reducing the damage to the first conductive part 12 caused by the welding operation, and also reducing the risk of welding particles falling into the outer casing 20 and causing a short circuit.

[0138] In some embodiments, refer to Figures 6 to 8 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 portion 233 and a second portion 234, the second portion 234 corresponding to the recess 232 along the first direction X. A first through hole 231 communicates with the recess 232. The portion of the first conductive portion 12 located on the side of the first wall 23 away from the main body 11 is a protruding section 12a of the first conductive portion 12. At least a portion of the protruding section 12a is accommodated in the recess 232 and welded to the second portion 234.

[0139] In one example, refer to Figure 6 and Figure 7 The first part 233 is directly connected to the second part 234. In another example, refer to... Figure 8 The first wall 23 includes a third portion 235, which connects the first portion 233 and the second portion 234. The third portion 235 is bent relative to the first portion 233 and also bent relative to the second portion 234. A first through hole 231 penetrates either the second portion 234 or the third portion 235.

[0140] Along the first direction X, the surface of the first part 233 facing away from the main body 11 is farther away from the main body 11 than the surface of the second part 234 facing away from the main body 11. The surface of the first part 233 facing the main body 11 can be flush with the surface of the second part 234 facing the main body 11, and the surface of the first part 233 facing the main body 11 can also be farther away from the main body 11 than the surface of the second part 234 facing the main body 11.

[0141] The protruding section 12a is the part of the first conductive part 12 that protrudes outward from the first through hole 231. The protruding section 12a can be entirely accommodated in the recess 232, or it can be partially accommodated in the recess 232.

[0142] The recess 232 provides at least a partial accommodating space for the protruding section 12a. The first conductive part 12 and the first wall 23 share a portion of the space in the first direction X, which can reduce the extra space occupied by the first conductive part 12 on the outside of the housing 20, thereby increasing the energy density of the battery cell 6.

[0143] In some embodiments, refer to Figure 5 In the same plane perpendicular to the first direction X, the orthographic projection of the protruding segment 12a lies within the orthographic projection of the second part 234. Along the first direction X, the protruding segment 12a does not overlap with the first part 233, and there is no thickness overlap between the protruding segment 12a and the first part 233, which is beneficial to improving the space utilization rate in the first direction X.

[0144] In some embodiments, the protruding section 12a is entirely accommodated within the recess 232. Along the first direction X, the protruding section 12a does not protrude from the recess 232, and the protruding section 12a does not occupy additional space outside the housing 20, which is beneficial to improving the energy density of the battery cell 6.

[0145] In some embodiments, refer to Figures 6 to 8 The first through hole 231 penetrates the second part 234 along the first direction X. In this way, the height difference in the first direction X between the position where the first conductive part 12 protrudes from the first through hole 231 and the position where the first conductive part 12 and the first wall 23 are welded can be reduced, the phenomenon of the first conductive part 12 arching in the recess 232 can be reduced, the space occupied by the first conductive part 12 in the first direction X in the recess 232 can be reduced, and the degree of bending of the first conductive part 12 can be reduced, thus reducing the risk of cracking of the first conductive part 12.

[0146] In some alternative embodiments, the first wall 23 includes a third portion 235 that connects the first portion 233 and the second portion 234. The third portion 235 is bent relative to the first portion 233 and also bent relative to the second portion 234. The second portion 234 and the third portion 235 form a first through-hole 231; or, the first through-hole 231 extends through the region of the third portion 235 adjacent to the second portion 234.

[0147] In some embodiments, refer to Figure 6 and Figure 7The second part 234 includes a first sub-part 2341 and a second sub-part 2342. Along the first direction X, the first surface 2341 of the first sub-part 2341, which is away from the main body 11, is closer to the main body 11 than the second surface 2342 of the second sub-part 2342, which is away from the main body 11. The protruding section 12a is welded to the first sub-part 2341.

[0148] In one example, along the first direction X, the surface of the first sub-part 2341 facing the main body 11 is closer to the main body 11 than the surface of the second sub-part 2342 facing the main body 11. In another example, along the first direction X, the surface of the first sub-part 2341 facing the main body 11 is flush with the surface of the second sub-part 2342 facing the main body 11.

[0149] 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.

[0150] 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.

[0151] In one example, there are two second sub-parts 2342, located on either side of the first sub-part 2341 along a second direction Y, which is perpendicular to the first direction X. In another example, the second sub-parts 2342 surround the outer periphery of the first sub-part 2341.

[0152] Compared to the portion of the recess 232 corresponding to the second sub-part 2342, the portion of the recess 232 corresponding to the first sub-part 2341 is more recessed, which can provide more accommodating space for the protruding section 12a and the welded part W in the first direction X, reduce the size of the protruding section 12a and the welded part W protruding from the recess 232 in the first direction X, thereby reducing the extra space occupied by the protruding section 12a and the welded part W.

[0153] 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.

[0154] In some embodiments, refer to Figure 6 and Figure 7In the same plane perpendicular to the first direction X, the orthographic projection of the protruding segment 12a and the orthographic projection of the second sub-part 2342 are spaced apart. The protruding segment 12a and the second sub-part 2342 do not overlap along the first direction X, and the protruding segment 12a and the second sub-part 2342 can share part of the space in the first direction X, which is beneficial to improving space utilization.

[0155] In some embodiments, refer to Figure 6 and Figure 7 The first through hole 231 is formed by the first sub-part 2341 and the second sub-part 2342. The protruding section 12a passes through the first through hole 231 and then bends towards the first sub-part 2341. This reduces the height difference in the first direction X between the point where the first conductive part 12 exits the first through hole 231 and the point where the first conductive part 12 and the first wall 23 are welded, reduces the arching of the protruding section 12a within the recess 232, reduces the space occupied by the protruding section 12a in the first direction X within the recess 232, and also reduces the degree of bending of the first conductive part 12, lowering the risk of cracking. Compared to the first through hole 231 being directly through the first sub-part 2341, the first through hole 231 being formed by the first sub-part 2341 and the second sub-part 2342 helps to reduce the size of the first sub-part 2341 and minimizes its impact on the structural strength of the first wall 23.

[0156] In some alternative embodiments, the first through hole 231 may also extend through the first sub-part 2341.

[0157] In some embodiments, refer to Figure 6 and Figure 7 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.

[0158] In one example, along the first direction X, the surface of the second sub-part 2342 facing the main body 11 is closer to the main body 11 than the surface of the third sub-part 2343 facing the main body 11. In another example, along the first direction X, the surface of the second sub-part 2342 facing the main body 11 may also be flush with the surface of the third sub-part 2343 facing the main body 11.

[0159] The connection methods between the cover 30 and the third surface 2343a include, but are not limited to, welding or bonding.

[0160] The cover 30 can be a conductive component or an insulating component.

[0161] Along the direction from the first wall 23 to the main body 11, the cover 30 covers the protruding section 12a.

[0162] 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.

[0163] 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.

[0164] In some embodiments, refer to Figure 6 and Figure 7 Along the first direction X, the first portion 233 includes a fourth surface 233a facing the main body portion 11, and along the direction of the first wall 23 pointing towards the main body portion 11, the second portion 234 at least partially protrudes from the fourth surface 233a.

[0165] In one example, along the direction from the first wall 23 toward the main body 11, only a portion of the first sub-part 2341 extends beyond the fourth surface 233a. Along the first direction X, the surface of the second sub-part 2342 facing the main body 11 may be flush with the fourth surface 233a.

[0166] In another example, along the direction from the first wall 23 toward the main body 11, a portion of the first sub-part 2341 and a portion of the second sub-part 2342 both extend beyond the fourth surface 233a. The dimension by which the first sub-part 2341 extends beyond the fourth surface 233a can be the same as or different from the dimension by which the second sub-part 2342 extends beyond the fourth surface 233a.

[0167] 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.

[0168] The second part 234 protrudes at least partially from the fourth surface 233a, which helps to increase the thickness of the second part 234, reduce the impact of the recess 232 on the structural strength of the first wall 23, and reduce the risk of deformation of the first wall 23.

[0169] In some embodiments, refer to Figure 6 and Figure 7The second part 234 includes a first sub-part 2341 and a second sub-part 2342. Along the first direction X, the first sub-part 2341, which is located away from the first surface 2341a of the main body 11, is closer to the main body 11 than the second sub-part 2342, which is located away from the second surface 2342a of the main body 11. The protruding section 12a is welded to the first sub-part 2341. Along the direction from the first wall 23 to the main body 11, the first sub-part 2341 protrudes at least partially from the fourth surface 233a.

[0170] Along the first direction X, the protruding section 12a and the first sub-section 2341 have overlapping thicknesses. The first sub-section 2341 at least partially protrudes from the fourth surface 233a. This is beneficial to increase the thickness of the first sub-section 2341 along the first direction X by increasing the degree of concavity of the corresponding portion of the recess 232 and the first sub-section 2341, thereby providing more accommodating space for the protruding section 12a in the first direction X and reducing the adverse effects on the structural strength of the first wall 23.

[0171] In some embodiments, refer to Figure 6 and Figure 7 Along the first direction X, a portion of the first conductive portion 12 is located on the side of the second sub-portion 2342 near the main body portion 11. Along the direction from the first wall 23 to the main body portion 11, at least a portion of the second sub-portion 2342 protrudes from the fourth surface 233a, and the size of the second sub-portion 2342 protruding from the fourth surface 233a is smaller than the size of the first sub-portion 2341 protruding from the fourth surface 233a.

[0172] The portion of the first wall 23 corresponding to the recess 232 is stepped. During the formation of the recess 232, a second sub-part 2342 that protrudes less toward the main body 11 is first formed by stamping, cutting or other means, and then a first sub-part 2341 that protrudes more toward the main body 11 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 process of the first wall 23.

[0173] The smaller size of the second sub-part 2342 protruding from the fourth surface 233a also helps to reduce the risk of interference between the second sub-part 2342 and the first conductive part 12, and reduce the adverse effects on the first conductive part 12.

[0174] In some embodiments, refer to Figure 6 and Figure 7The first conductive portion 12 includes a first tab 121 and a first adapter portion 122. The first tab 121 is connected to the main body portion 11, and the first adapter portion 122 is soldered to the first tab 121. The first adapter portion 122 passes through the first through hole 231 and is soldered to the side of the first sub-portion 2341 opposite to the main body portion 11. In the same plane perpendicular to the first direction X, the orthographic projection of the portion of the first adapter portion 122 accommodated in the recess 232 is spaced apart from the orthographic projection of the second sub-portion 2342. The orthographic projection of the portion of the first adapter portion 122 located on the side of the first wall 23 near the main body portion 11 is also spaced apart from the orthographic projection of the first sub-portion 2341.

[0175] The extended section 12a includes the portion of the first transition portion 122 located on the side of the first wall 23 away from the main body portion 11.

[0176] Optionally, the first electrode tab 121 is entirely located on the side of the first wall 23 near the main body 11. Alternatively, a portion of the first electrode tab 121 is located on the side of the first wall 23 near the main body 11, and another portion of the first electrode tab 121 can be accommodated in the first through hole 231.

[0177] A portion of the first adapter 122 is located on the side of the first wall 23 near the main body 11 and is welded to the first tab 121. The orthographic projection of this portion of the first adapter 122 does not overlap with the orthographic projection of the first sub-part 2341. This portion of the first adapter 122 is less likely to interfere with the first sub-part 2341, making it easier for the first adapter 122 to pass through the first through hole 231.

[0178] A portion of the first adapter 122 extends through the first through hole 231 and is welded to the first sub-part 2341 to form a welded portion W. The orthographic projection of the portion of the first adapter 122 extending through the first through hole 231 does not overlap with the orthographic projection of the second sub-part 2342. The portion of the first adapter 122 extending through the first through hole 231 and the second sub-part 2342 do not have thickness overlap, and can share part of the space in the first direction X, which is beneficial to improving space utilization.

[0179] The first tab 121 is relatively soft, and it typically comprises multiple tab layers. Therefore, it is difficult for the first tab 121 to pass through the first through hole 231, and the first tab 121 is more prone to cracking due to concentrated stress. In this embodiment, the first adapter 122 is inserted into the first through hole 231, which helps to reduce assembly difficulty, reduce interference between the first tab 121 and the first wall 23, and reduce the risk of the first tab 121 cracking due to concentrated stress.

[0180] In some embodiments, refer to Figure 6 and Figure 7The battery cell 6 includes a first insulating member 51, which is disposed at least partially between the main body portion 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, through which a first conductive portion 12 passes, and at least a portion of a second portion 234 is accommodated in the second through hole 511.

[0181] 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.

[0182] The first insulating member 51 may be connected to the first wall 23 by bonding, heat fusion or other means; the first insulating member 51 may also only contact or abut against the first wall 23; the first insulating member 51 may also be spaced apart from the first wall 23, for example, other components are provided between the first insulating member 51 and the first wall 23.

[0183] The first insulating member 51 may contact or abut against the main body 11, or the first insulating member 51 may be spaced apart from the main body 11.

[0184] A portion of the first conductive part 12 passes through the second through hole 511 and the first through hole 231 in sequence 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 conductive part 12.

[0185] 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 to each other along the first direction X. This helps to reduce the bending of the first conductive part 12 and facilitates the first conductive part 12 to pass through the second through hole 511 and the first through hole 231 in sequence.

[0186] 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 conductive part 12 and facilitates the smooth passage of the first conductive part 12 through the first wall 23.

[0187] 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.

[0188] 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.

[0189] At least a portion of the second part 234 shares at least a portion of the space in the first direction X with the first insulating member 51, which helps to reduce the extra space occupied by the second part 234 in the housing 20 and improve space utilization.

[0190] In some embodiments, refer to Figure 9 and Figure 10 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] In some embodiments, refer to Figure 10 and Figure 11 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.

[0200] 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 may completely cover the main body 11, or it may only cover a portion of the main body 11. Optionally, 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. 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.

[0201] Optionally, the third insulating element 53 includes an insulating film.

[0202] The first end face 51a can be a single surface or include multiple surfaces.

[0203] Side 51b is connected to first end face 51a. The angle between side 51b and first end face 51a can be 90° or less than 90°.

[0204] Side 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, wherein the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The 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.

[0205] 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.

[0206] In some embodiments, refer to Figure 10 The first insulating member 51 includes at least two support portions 512, with adjacent support portions 512 spaced apart along a third direction Z. Each support portion 512 includes a fifth surface 512a and two sixth surfaces 512b opposite each other along a second direction Y, with the fifth surfaces 512a of adjacent support portions 512 arranged opposite each other along a 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.

[0207] Optionally, the first insulating member 51 further includes a connecting portion 513, which connects two adjacent support portions 512. Along the first direction X, a portion of the support portion 512 protrudes from the surface of the connecting portion 513 near the main body portion 11.

[0208] Optionally, there are two second insulating members 52, and the two second insulating members 52 are respectively connected to the two support portions 512.

[0209] In some embodiments, refer to Figure 10 The second insulating member 52 includes a first fixing portion 521 and two second fixing portions 522 spaced apart along the second direction Y. At least a portion of the first fixing portion 521 is located between the first insulating member 51 and the first wall 23 along the first direction X, and the first fixing portion 521 connects to the two second fixing portions 522. The two second fixing portions 522 are respectively connected to two opposing surfaces of the main body 11 along the second direction Y.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] In some embodiments, the orthographic projections of the first fixing part 521 and the first through hole 231 are spaced apart in the same plane perpendicular to the first direction X. This helps to reduce interference between the first fixing part 521 and the first conductive part 12, and facilitates the smooth passage of a portion of the first conductive part 12 through the first wall 23.

[0215] In some embodiments, refer to Figure 11 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.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] In some embodiments, refer to Figures 4 to 7 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.

[0220] The cover 30 can be a conductive component or an insulating component.

[0221] Optionally, the cover 30 covers the protruding section 12a along the direction from the first wall 23 to the main body 11.

[0222] In some embodiments, refer to Figures 5 to 7 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 first through hole 231 is connected to the recess 232. A portion of the first conductive part 12 and at least a portion of the cover 30 are accommodated in the recess 232.

[0223] Optionally, the first through hole 231 penetrates the bottom wall or side wall of the recess 232.

[0224] The portion of the first conductive part 12 located on the side of the first wall 23 away from the main body part 11 is entirely accommodated within the recess 232. The cover 30 may be entirely accommodated within the recess 232, or only a portion of the cover 30 may be accommodated within the recess 232, with another portion of the cover 30 protruding from the recess 232, for example.

[0225] The recess 232 provides a receiving space for the portion of the first conductive part 12 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 conductive part 12 in the first direction X, improves the space utilization rate in the first direction X, and thus increases the energy density of the battery cell 6.

[0226] In some embodiments, the cover 30 is welded to the first wall 23 and is used to connect to the busbar component.

[0227] 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.

[0228] 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 conductive part 12 is achieved through the first wall 23, which helps to reduce the welding difficulty and improve the connection strength.

[0229] In some embodiments, refer to Figure 13 The cover 30 is used for welding to the busbar component. The first conductive part 12 is welded to the side of the first wall 23 away from the main body 11 and forms a welded part W. The battery cell 6 includes a separator 40, at least a portion of which is disposed between the cover 30 and the welded part W along the first direction X. The thermal conductivity of the separator 40 is less than that of the cover 30.

[0230] The isolator 40 can be a conductive component or an insulating component.

[0231] The separator 40 is at least partially disposed between the welded part W and the cover 30. The separator 40 has a low thermal conductivity, which 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 conductive part 12 and the first wall 23, thereby improving the reliability of the battery cell 6.

[0232] In some embodiments, refer to Figure 13 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.

[0233] 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.

[0234] 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.

[0235] In some embodiments, the isolator 40 is connected to at least one of the cover 30, the first conductive portion 12, and the weld portion W. This improves the installation stability of the isolator 40 and reduces the risk of the isolator 40 shifting or displacing and becoming completely misaligned with the weld portion W.

[0236] In some embodiments, refer to Figure 13 The isolator 40 is connected to the first conductive part 12 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 effects 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.

[0237] 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.

[0238] 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.

[0239] In some embodiments, the melting point of the separator 40 is higher than that of the cover 30.

[0240] Alternatively, the spacer 40 may be a metal component, for example, the spacer 40 may be made of steel.

[0241] Optionally, the separator 40 can be a non-metallic component, for example, the separator 40 includes polyimide adhesive or mica, etc.

[0242] 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.

[0243] In some embodiments, the melting point of the separator 40 is greater than or equal to 250°C.

[0244] 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.

[0245] In some embodiments, refer to Figure 5 , Figure 12 and Figure 13 The battery cell 6 includes two first conductive parts 12, and the first wall 23 is provided with two first through holes 231, with the two first conductive parts 12 respectively passing through the two first through holes 231.

[0246] In one example, the battery cell 6 includes two electrode units 10, each electrode unit 10 including a first conductive portion 12. The first conductive portions 12 of the two electrode units 10 are respectively led out from the main body portions 11 of the two electrode units 10. The main body portions 11 of the two electrode units 10 are stacked, and the stacking direction of the main body portions 11 of the two electrode units 10 is perpendicular to the first direction X.

[0247] In another example, the battery cell 6 includes an electrode unit 10, which includes two first conductive portions 12. Both first conductive portions 12 extend from the body portion 11 of the electrode unit 10.

[0248] The arrangement direction of the two first conductive parts 12 is the same as the arrangement direction of the two first through holes 231, so that they can pass through the two first through holes 231 respectively. Optionally, the two first through holes 231 are arranged along the second direction Y, which is perpendicular to the first direction X.

[0249] The two first through holes 231 are spaced apart, which helps to reduce interference between the two first conductive parts 12. Along the first direction X, the two first conductive parts 12 do not overlap.

[0250] The two first conductive parts 12 of the battery cell 6 are arranged separately, which helps to reduce the thickness of the individual first conductive part 12 and reduce the space occupied by the first conductive part 12 in the first direction X inside the housing 20, thereby improving the energy density of the battery cell 6.

[0251] In some embodiments, the housing 20 includes two third walls 25 disposed along a second direction Y, which is perpendicular to the first direction X. The first conductive portion 12 includes a first tab 121, which includes a plurality of first tab layers, and the first tab layers of the two first conductive portions 12 converge toward the two third walls 25 respectively.

[0252] The second direction Y is parallel to the thickness direction of electrode unit 10.

[0253] Multiple first tab layers of the same first conductive part 12 are stacked together in a direction close to the same third wall 25, and then extend in a direction gradually away from the third wall 25. The portion of the first tab 121 located inside the outer casing 20 is generally C-shaped.

[0254] In this embodiment, the first electrode tab 121 is bent in a C-shape, which can extend the overall length of the first electrode tab 121 and give the first electrode tab 121 a certain redundancy for being stretched and deformed. This helps to alleviate the pulling effect on the first electrode tab 121 when the first conductive part 12 passes through the first through hole 231, reduce the tensile stress on the first electrode tab 121, and reduce the risk of the first electrode tab 121 being pulled off.

[0255] In some embodiments, refer to Figure 5 , Figure 12 and Figure 13 Two first conductive parts 12 are disposed along the second direction Y, and two first through holes 231 are disposed at intervals along the second direction Y, which is perpendicular to the first direction X. Both first conductive parts 12 are welded to the portion of the first wall 23 located between the two first through holes 231.

[0256] After the two first conductive parts 12 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 conductive part 12 is roughly Z-shaped, which, compared with U-shaped or other bending shapes, helps to reduce the degree of bending of the first conductive part 12 and reduce the risk of cracking of the first conductive part 12.

[0257] In some embodiments, refer to Figure 5 , Figure 12 and Figure 13Along 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 portion 233 and a second portion 234. The second portion 234 corresponds to the recess 232 along the first direction X, and a first through hole 231 penetrates the second portion 234. The second portion 234 includes a first sub-portion 2341 and a second sub-portion 2342. Along the first direction X, the first surface 2341 of the first sub-portion 2341 facing away from the main body 11 is closer to the main body 11 than the second surface 2342 of the second sub-portion 2342 facing away from the main body 11. Along the second direction Y, at least a portion of the first sub-portion 2341 is located between the two first through holes 231. The second direction Y is perpendicular to the first direction X, and both first conductive portions 12 are welded to the portion of the first sub-portion 2341 located between the two first through holes 231.

[0258] 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.

[0259] In another example, both first through holes 231 penetrate the first sub-part 2341.

[0260] Both first conductive parts 12 are welded to the first sub-part 2341. The first sub-part 2341 is more recessed than the second sub-part 2342, which can provide more space for the two first conductive parts 12, 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 the molding difficulty.

[0261] In some embodiments, the orthographic projections of the two first conductive parts 12 are spaced apart in the same plane perpendicular to the first direction X. In this way, the two first conductive parts 12 do not overlap in the first direction X, and can share the space in the first direction X, thereby improving space utilization; it also helps to reduce interference between the two first conductive parts 12 and reduce the risk of edge warping, bending deformation, and other factors that affect the welding strength of the first conductive parts 12.

[0262] In some embodiments, refer to Figure 13 Two first conductive portions 12 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 conductive portions 12. Along the first direction X, at least a portion 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 conductive portions 12.

[0263] 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.

[0264] In some embodiments, refer to Figures 5 to 8 The first conductive part 12 includes a first tab 121 and a first adapter part 122. The first tab 121 is connected to the main body part 11, and the first adapter part 122 is welded to the first tab 121. The first adapter part 122 passes through the first through hole 231. A portion of the first adapter part 122 is located on the side of the first wall 23 away from the main body part 11 and is welded to the first wall 23.

[0265] In one example, the first tab 121 is entirely located on the side of the first wall 23 closest to the main body 11. Alternatively, a portion of the first tab 121 is located on the side of the first wall 23 closest to the main body 11, and another portion of the first tab 121 can be accommodated in the first through hole 231, without the first tab 121 protruding from the first through hole 231. The protruding section 12a includes the portion of the first transition portion 122 located on the side of the first wall 23 away from the main body 11.

[0266] In another example, a portion of the first tab 121 is located on the side of the first wall 23 closer to the main body 11, and another portion of the first tab 121 can pass through the first through hole 231 and extend to the side of the first wall 23 away from the main body 11. The protruding section 12a includes the portion of the first transition portion 122 located on the side of the first wall 23 away from the main body 11, and the portion of the first tab 121 located on the side of the first wall 23 away from the main body 11.

[0267] A portion of the first adapter 122 is located on the side of the first wall 23 near the main body 11 and is welded to the first tab 121. A portion of the first adapter 122 extends through the first through hole 231 and is welded to the first wall 23.

[0268] The first tab 121 is relatively soft, and it typically comprises multiple tab layers. Therefore, it is difficult for the first tab 121 to pass through the first through hole 231, and the first tab 121 is more prone to cracking due to concentrated stress. In this embodiment, the first adapter 122 is inserted into the first through hole 231, which helps to reduce assembly difficulty, reduce interference between the first tab 121 and the first wall 23, and reduce the risk of the first tab 121 cracking due to concentrated stress.

[0269] In some embodiments, refer to Figures 5 to 8The first electrode tab 121 is located on the side of the first wall 23 near the main body 11. The first electrode tab 121 does not pass through the first through hole 231, which helps to reduce the number of bends of the first electrode tab 121, reduce the interference between the first electrode tab 121 and the first wall 23, and reduce the risk of cracking due to stress concentration in a local area of ​​the first electrode tab 121.

[0270] In some embodiments, refer to Figures 6 to 8 The first adapter 122 includes two adapter layers 1221. The end of the first tab 121 away from the main body 11 is located between the two adapter layers 1221 and is welded to the two adapter layers 1221.

[0271] The end of the first electrode 121 that is away from the main body 11 is a section of the first electrode 121 that is away from the main body 11.

[0272] The welding methods for the transition layer 1221 and the first tab 121 include, but are not limited to, ultrasonic welding or laser welding.

[0273] The thicknesses of the two transition layers 1221 can be the same or different.

[0274] Either of the two transition layers 1221 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 1221 pass through the first through hole 231 and extend to the side of the first wall 23 away from the main body 11.

[0275] In one example, the first tab 121 is entirely disposed on the side of the first wall 23 near the main body 11, and only at least one of the two transition layers 1221 passes through the first through hole 231. In another example, both transition layers 1221 and the first tab 121 located between the two transition layers 1221 pass through the first through hole 231.

[0276] The two transition layers 1221 restrict and protect the first electrode tab 121, which helps reduce the risk of short circuit caused by the end of the first electrode tab 121 away from the main body 11 being inserted into the main body 11. The first electrode tab 121 is welded between the two transition layers 1221, which helps to improve the welding strength and stability and reduce the damage to the first electrode tab 121 caused by welding heat.

[0277] In some embodiments, refer to Figures 6 to 8 The two transition layers 1221 are stacked and welded to the first wall 23 on the side of the first wall 23 away from the main body 11. The stacking and welding of the two transition layers 1221 to the first wall 23 is beneficial to the welding strength and stability.

[0278] The welding methods for the transition layer 1221 and the first wall 23 include, but are not limited to, ultrasonic welding or laser welding.

[0279] In some other embodiments, the first conductive part 12 includes a first tab 121, which passes through the first through hole 231. A portion of the first tab 121 is located on the side of the first wall 23 away from the main body 11 and is welded to the first wall 23.

[0280] In some embodiments, refer to Figure 5 The second conductive part 13 includes a second tab 131, which is connected to the main body part 11. The battery cell 6 includes two second conductive parts 13, and the second tabs 131 of the two second conductive parts 13 are disposed separately along a second direction Y, which is perpendicular to the first direction X.

[0281] In one example, refer to Figure 5 The battery cell 6 includes two electrode units 10, each electrode unit 10 including a second conductive portion 13. The second conductive portions 13 of the two electrode units 10 are respectively led out from the main body portion 11 of the two electrode units 10. The main body portions 11 of the two electrode units 10 are stacked along the second direction Y.

[0282] In another example, the battery cell 6 includes an electrode unit 10, which includes two second conductive portions 13. Both second conductive portions 13 extend from the main body portion 11 of the electrode unit 10.

[0283] In one example, the battery cell 6 includes an adapter 80, which is welded to the electrode terminal 60 and to the second tab 131 of all electrode cells 10.

[0284] In another example, the second conductive part 13 also includes a second adapter part, which is soldered to the second tab 131 and the electrode terminal 60.

[0285] The two second conductive parts 13 of the battery cell 6 are arranged separately, which helps to reduce the thickness of the individual second conductive part 13 and reduce the space occupied by the second conductive part 13 in the first direction X inside the housing 20, thereby improving the energy density of the battery cell 6.

[0286] In some embodiments, refer to Figure 5 The second conductive part 13 includes a second tab 131, which is connected to the main body part 11. The battery cell 6 includes an adapter 80, which connects the second tab 131 and the electrode terminal 60.

[0287] The adapter 80 is welded to the second electrode lug 131, and the adapter 80 is welded to the electrode terminal 60.

[0288] There can be one or more second conductive parts 13. The second tabs 131 of the multiple second conductive parts 13 are all connected to the adapter 80. The multiple second conductive parts 13 are indirectly connected to the electrode terminal 60 through an adapter 80, which helps to simplify the structure and improve assembly efficiency.

[0289] In some embodiments, refer to Figures 14 to 17 The outer casing 20 includes two third walls 25 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 second wall 24; the third insulating member 53 covers at least a portion of the outer side 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 third wall 25 and the second conductive portion 13.

[0290] Each third wall 25 connects to the first wall 23 and the second wall 24.

[0291] The fourth insulating member 54 is used to insulate and isolate the main body 11 and the second wall 24. Optionally, the fourth insulating member 54 is a plastic part.

[0292] Along the direction from the main body 11 toward the second wall 24, 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.

[0293] Along the direction from the main body 11 toward the second wall 24, a portion of the third insulating member 53 extends beyond the main body 11 and is located between the third wall 25 and the second conductive part 13, thereby insulating and isolating the third wall 25 and the second conductive part 13.

[0294] Along the second direction Y, at least a portion of the fifth insulating member 55 is disposed between the third wall 25 and the second conductive part 13, thereby insulating and isolating the third wall 25 and the second conductive part 13.

[0295] Along the second direction Y, the portion of the third insulating member 53 located between the third wall 25 and the second conductive portion 13, and the portion of the fifth insulating member 55 located between the third wall 25 and the second conductive portion 13 are stacked.

[0296] 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 second wall 24 is disposed on one side of the second conductive portion 13 along the second direction Y, and another portion is disposed on the other side of the second conductive portion 13 along the second direction Y. A portion of the fifth insulating member 55 is disposed on one side of the second conductive portion 13 along the second direction Y, and another portion of the fifth insulating member 55 is disposed on the other side of the second conductive portion 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 conductive portion 13 are stacked.

[0297] Optionally, the fifth insulating element 55 includes an insulating film or an insulating sheet.

[0298] Both the third insulating member 53 and the fifth insulating member 55 can prevent the second conductive part 13 from overlapping with the third wall 25. The third insulating member 53 and the fifth insulating member 55 can form a double-layer insulation between the third wall 25 and the second conductive part 13, which helps to reduce the risk of short circuit caused by the second conductive part 13 overlapping with the third wall 25 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.

[0299] 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 conductive portion 13, and both ends of the second conductive portion 13 do not extend beyond the fifth insulating member 55 along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0300] The fifth insulating member 55 can prevent the second conductive part 13 from overlapping with the third wall 25 in any area of ​​the third direction Z, thereby improving the insulation and isolation effect of the fifth insulating member 55 on the second conductive part 13 and the third wall 25.

[0301] In some embodiments, in the same plane perpendicular to the second direction Y, the orthographic projection of the second conductive portion 13 lies within the orthographic projection of the fifth insulating member 55.

[0302] Along the second direction Y, the fifth insulating member 55 can completely cover the second conductive part 13, preventing any area of ​​the second conductive part 13 from overlapping with the third wall 25, thereby improving the insulation and isolation effect of the fifth insulating member 55 on the second conductive part 13 and the third wall 25.

[0303] In some embodiments, refer to Figures 14 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 unit 10 and the third wall 25. Along the first direction X, at least a portion of the second insulating portion 552 is disposed between the electrode unit 10 and the second wall 24.

[0304] Optionally, the first insulating part 551 and the second insulating part 552 are integrally formed.

[0305] 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.

[0306] 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.

[0307] 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 conductive portion 13 along the second direction Y, and the second insulating portion 552 is connected to the first insulating portion 551.

[0308] 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 conductive portion 13 along the second direction Y, and the second insulating portion 552 connects the two first insulating portions 551.

[0309] The first insulating part 551 insulates and isolates the electrode unit 10 and the third wall 25. 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.

[0310] 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 respectively cover the two casing openings 211. The first wall 23 is one of the end caps 22, and the second wall 24 is the other end cap 22.

[0311] During assembly, firstly, the second conductive part 13 is welded to the electrode terminal 60, or firstly, the adapter 80 is welded to the second conductive part 13 and the electrode terminal 60; then, the electrode unit 10 is installed into the housing 21, and the second wall 24 and the housing 21 are welded together; after the electrode unit 10 is installed into the housing, a portion of the first conductive part 12 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 conductive part 12 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 conductive part 12 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.

[0312] Before welding the first wall 23 and the shell 21, the first conductive part 12 is passed through the first through hole 231, which helps to reduce the assembly difficulty and improve the assembly efficiency.

[0313] 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 a first direction X, and the end cap 22 is connected to the housing 21 and covers the housing opening 211. The second wall 24 is the end cap 22, and the housing 21 is integrally formed and includes a first wall 23.

[0314] During assembly, the second conductive part 13 is first welded to the electrode terminal 60, or the adapter 80 is first welded to the second conductive part 13 and the electrode terminal 60; then, the electrode unit 10 is installed into the housing 21, and the second wall 24 and the housing 21 are welded together; during the process of inserting the electrode unit 10 into the housing, a portion of the first conductive part 12 passes through the first through hole 231 of the first wall 23, and the first conductive part 12 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.

[0315] In some embodiments, refer to Figure 5 The outer casing 20 includes two fourth walls 26 arranged along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. The fourth walls 26 connect to the two third walls 25, and the fourth walls 26 connect to the first wall 23 and the second wall 24.

[0316] Optionally, the two third walls 25 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 second wall 24 of the other end cap 22 is welded to the housing 21.

[0317] 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.

[0318] 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.

[0319] This application provides a battery cell 6, which includes two electrode units 10, a housing 20, and electrode terminals 60. The housing 20 includes a first wall 23 and a second wall 24 disposed along a first direction X. The first wall 23 has two first through holes 231. The electrode unit 10 includes a main body 11 and a first conductive part 12 and a second conductive part 13 with opposite polarities. Along the first direction X, the main body 11 is disposed between the first wall 23 and the second wall 24. The first conductive part 12 extends from the side of the main body 11 near the first wall 23, and the second conductive part 13 extends from the side of the main body 11 near the second wall 24. The first conductive portion 12 includes a first tab 121 and a first adapter portion 122. The first tab 121 is connected to the main body portion 11, and the first adapter portion 122 is welded to the first tab 121. The first adapter portions 122 of the two electrode units 10 are respectively disposed in two first through holes 231. A portion of the first adapter portion 122 is located on the side of the first wall 23 away from the main body portion 11 and is welded to the side of the first wall 23 opposite to the main body portion 11. The first adapter portion 122 includes two adapter layers 1221. The end of the first tab 121 away from the main body portion 11 is disposed between the two adapter layers 1221 and is welded to the two adapter layers 1221. The first tab 121 includes multiple first tab layers, and the first tab layers of the two first conductive portions 12 converge toward the two third walls 25 respectively. The electrode terminal 60 is disposed on the second wall 24, and the second conductive portion 13 is electrically connected to the electrode terminal 60. The second conductive part 13 includes a second tab 131, and the second tabs 131 of the two electrode units 10 are disposed separately along the second direction Y.

[0320] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall and a second wall disposed along a first direction, wherein the first wall is provided with a first through hole; An electrode unit includes a main body and a first conductive part and a second conductive part with opposite polarities. Along the first direction, the main body is disposed between a first wall and a second wall. The first conductive part extends from the side of the main body near the first wall, and the second conductive part extends from the side of the main body near the second wall. The first conductive part passes through the first through hole, and a portion of the first conductive part is located on the side of the first wall away from the main body and is welded to the side of the first wall opposite to the main body. as well as An electrode terminal is disposed on the second wall, and the second conductive part is electrically connected to the electrode terminal.

2. 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. The first wall includes a first part and a second part, and the second part corresponds to the recess along the first direction. The first through hole communicates with the recess, and the portion of the first conductive part located on the side of the first wall away from the main body is the protrusion of the first conductive part. At least a portion of the protrusion is accommodated in the recess and welded to the second part.

3. The battery cell according to claim 2, characterized in that, In the same plane perpendicular to the first direction, the orthographic projection of the protruding segment lies within the orthographic projection of the second portion.

4. The battery cell according to claim 2 or 3, characterized in that, The protruding section is entirely accommodated within the recess.

5. The battery cell according to claim 2, characterized in that, The first through hole penetrates the second portion along the first direction.

6. The battery cell according to claim 2, characterized in that, The second part includes a first sub-part and a second sub-part, wherein 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 than the second sub-part is. The protruding section is welded to the first sub-section.

7. The battery cell according to claim 6, characterized in that, In the same plane perpendicular to the first direction, the orthographic projection of the extended segment and the orthographic projection of the second sub-part are spaced apart.

8. The battery cell according to claim 6 or 7, characterized in that, The first through hole is formed by the first sub-part and the second sub-part.

9. The battery cell according to claim 6, 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.

10. The battery cell according to claim 2, characterized in that, Along the first direction, the first portion includes a fourth surface facing the main body portion, and along the direction from the first wall toward the main body portion, the second portion at least partially protrudes from the fourth surface.

11. The battery cell according to claim 10, characterized in that, The second part includes a first sub-part and a second sub-part. Along the first direction, the first sub-part has a first surface away from the main body that is closer to the main body than the second sub-part has a second surface away from the main body. The protruding section is welded to the first sub-part. Along the direction from the first wall toward the main body, the first sub-part protrudes at least partially from the fourth surface.

12. The battery cell according to claim 11, characterized in that, Along the first direction, a portion of the first conductive portion is located on the side of the second sub-portion closer to the main body portion; Along the direction from the first wall toward the main body, at least a portion of the second sub-part protrudes from the fourth surface, and the size of the second sub-part protruding from the fourth surface is smaller than the size of the first sub-part protruding from the fourth surface.

13. The battery cell according to claim 11 or 12, characterized in that, The first conductive part includes a first electrode tab and a first adapter part. The first electrode tab is connected to the main body part, the first adapter part is welded to the first electrode tab, the first adapter part passes through the first through hole, and the first adapter part is welded to the side of the first sub-part opposite to the main body part. In the same plane perpendicular to the first direction, the orthographic projection of the portion of the first transition portion that is accommodated in the recess is spaced apart from the orthographic projection of the second sub-part, and the orthographic projection of the portion of the first transition portion located on the side of the first wall near the main body is spaced apart from the orthographic projection of the first sub-part.

14. The battery cell according to claim 2, 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 conductive part passes through the second through hole, and at least a portion of the second part is accommodated in the second through hole.

15. 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.

16. The battery cell according to claim 15, characterized in that, The second insulating member is connected to at least one of the main body and the first insulating member.

17. The battery cell according to claim 15 or 16, 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.

18. The battery cell according to claim 17, 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.

19. The battery cell according to claim 15, 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.

20. 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.

21. The battery cell according to claim 20, 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 conductive part and at least a portion of the cover are accommodated in the recess.

22. The battery cell according to claim 20 or 21, characterized in that, The cover is welded to the first wall and is used to connect to the busbar component.

23. The battery cell according to claim 22, characterized in that, The cover is used for welding to the busbar component; The first conductive part is welded to the side of the first wall away from the main body and forms a welded part. The battery cell includes an insulating member. Along the first direction, at least a portion of the insulating member is disposed between the cover and the welded part. The thermal conductivity of the insulating member is less than that of the cover.

24. The battery cell according to claim 23, characterized in that, Along the direction from the first wall toward the main body, the spacer completely covers the welded portion.

25. The battery cell according to claim 23, characterized in that, The melting point of the insulating element is higher than that of the covering element.

26. The battery cell according to claim 1, characterized in that, The battery cell includes two first conductive parts, and the first wall is provided with two first through holes, with the two first conductive parts respectively passing through the two first through holes.

27. The battery cell according to claim 26, characterized in that, The outer casing includes two third walls disposed along a second direction, the second direction being perpendicular to the first direction; The first conductive part includes a first tab, and the first tab includes a plurality of first tab layers. The first tab layers of the two first conductive parts respectively converge toward the two third walls.

28. The battery cell according to claim 26, characterized in that, Two first conductive parts are arranged along a second direction, and two first through holes are spaced apart along the second direction, the second direction being perpendicular to the first direction. Both first conductive parts are welded to the portion of the first wall located between the two first through holes.

29. The battery cell according to claim 28, 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 conductive parts are welded to the portion of the first sub-part located between the two first through holes.

30. The battery cell according to claim 26, characterized in that, In the same plane perpendicular to the first direction, the orthographic projections of the two first conductive parts are spaced apart.

31. The battery cell according to claim 1, characterized in that, The first conductive part includes a first electrode and a first adapter. The first electrode is connected to the main body, the first adapter is welded to the first electrode, the first adapter 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.

32. The battery cell according to claim 31, characterized in that, The first electrode tab is disposed on the side of the first wall near the main body.

33. The battery cell according to claim 31 or 32, characterized in that, The first adapter includes two adapter layers, and the end of the first electrode away from the main body is disposed between the two adapter layers and welded to the two adapter layers.

34. The battery cell according to claim 33, characterized in that, The two transition layers are stacked and welded to the first wall on the side of the first wall away from the main body.

35. The battery cell according to claim 1, characterized in that, The first conductive part includes a first tab, which is disposed in the first through hole, and a portion of the first tab is located on the side of the first wall away from the main body and is welded to the first wall.

36. The battery cell according to claim 1, characterized in that, The second conductive part includes a second electrode tab, which is connected to the main body part; The battery cell includes two second conductive portions, and the second tabs of the two second conductive portions are separated along a second direction, which is perpendicular to the first direction.

37. The battery cell according to claim 1, characterized in that, The second conductive part includes a second tab, which is connected to the main body; the battery cell includes an adapter, which connects the second tab and the electrode terminal.

38. The battery cell according to claim 1, characterized in that, The outer casing includes two third 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 second wall. The third insulating member covers at least a portion of the outer side 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 third wall and the second conductive portion.

39. The battery cell according to claim 38, 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 conductive part, and the two ends of the second conductive part 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.

40. The battery cell according to claim 38 or 39, characterized in that, In the same plane perpendicular to the second direction, the orthographic projection of the second conductive part lies within the orthographic projection of the fifth insulating member.

41. The battery cell according to claim 38, 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 unit and the third wall, and along the first direction, at least a portion of the second insulating portion is disposed between the electrode unit and the second wall.

42. The battery cell according to claim 1, 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 second wall is the end cap, and the housing is integrally formed and includes the first wall.

43. The battery cell according to claim 1, 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 second wall is the other end cap.

44. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-43.

45. An electrical appliance, characterized in that, Includes the battery device according to claim 44, the battery device being used to provide electrical energy.

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