Battery cell, battery device, and electric device

Abstract

The application discloses a battery cell, a battery device and a power utilization equipment. The battery cell comprises an electrode unit, a shell, a first insulating piece and a second insulating piece. The electrode unit comprises a main body part and a first conductive part connected to the main body part and led out from the main body part. The main body part is accommodated in the shell, the shell comprises a first wall located at one side of the main body part along a first direction, the first wall is provided with a first through hole, the first conductive part is arranged through the first through hole, and a part of the first conductive part is located at one side of the first wall away from the main body part along the first direction and electrically connected to the first wall. At least part of the first insulating piece is arranged between the main body part and the first wall along the first direction. The second insulating piece is configured to fix the first insulating piece to the main body part. The application can limit the displacement and shaking of the first insulating piece, improve the stability of the first insulating piece, thereby improving the insulation isolation effect and improving the reliability.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to PCT application No. PCT / CN2025 / 145284, 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, the insulation of battery cells is of paramount importance. How to improve the insulation effect to enhance the reliability of battery cells is a research direction in battery technology. Utility Model Content

[0006] This application provides a battery cell, a battery device, and an electrical appliance, which helps to improve insulation and isolation effects and increase the reliability of the battery cell.

[0007] According to a first aspect of this application, a battery cell is provided, comprising an electrode unit, a housing, a first insulating member, and a second insulating member. The electrode unit includes a main body portion and a first conductive portion connected to and extending from the main body portion. The main body portion is housed within the housing, which includes a first wall located on one side of the main body portion along a first direction. The first wall has a first through-hole, through which the first conductive portion passes. A portion of the first conductive portion is located on the side of the first wall away from the main body portion along the first direction and is electrically connected to the first wall. At least a portion of the first insulating member is disposed between the main body portion and the first wall along the first direction. The second insulating member is configured to fix the first insulating member to the main body portion.

[0008] A portion of the first conductive part extends through the first wall and is electrically connected to it. This reduces the space occupied by the first conductive part within the casing and eliminates the need for traditional electrode terminals, simplifying the structure of the battery cell and increasing its energy density. The second insulating member helps limit the displacement and movement of the first insulating member within the casing, improving its stability and thus enhancing insulation and isolation, thereby increasing the reliability of the battery cell. Furthermore, the second insulating member also improves the insulation between the main body and the casing.

[0009] In some embodiments, the second insulating member is connected to the main body. This improves the stability of the second insulating member relative to the main body, thereby enhancing the fixing effect of the second insulating member on the first insulating member.

[0010] In some embodiments, the second insulating member is connected to the first insulating member. This improves the stability of the second insulating member relative to the first insulating member, thereby enhancing the fixing effect of the second insulating member on the first insulating member.

[0011] In some embodiments, the first insulating member has a first end face and a side face, the first end face facing the first wall along a first direction, and the side face intersecting the first end face; the second insulating member connects the side face and the main body. Thus, the second insulating member can have various structures such as strip, U-shape, L-shape, or ring, which improves the flexibility in selecting the first insulating member.

[0012] In some embodiments, the first insulating member includes at least two support portions, with adjacent support portions spaced apart along a third direction, and the support portions abut against the main body portion; each support portion includes a first surface and two opposing second surfaces along a second direction, the first surfaces of adjacent support portions being arranged opposite each other along a third direction, and the side surface including a first surface and a second surface; the second insulating member is connected to at least one of the first surface and the second surface, and the first direction, the second direction, and the third direction are perpendicular to each other. This increases the connection area between the second insulating member and the first insulating member, improving the fixing effect of the second insulating member on the first insulating member.

[0013] In some embodiments, the first insulating member includes a connecting portion that connects two adjacent supporting portions. Along a first direction, a portion of the supporting portion protrudes from the surface of the connecting portion facing the main body. The supporting portion is closer to the main body than the connecting portion, and an accommodating space can be formed on the side of the connecting portion facing the main body to accommodate a portion of the first conductive portion. The first conductive portion and the first insulating member share a portion of the space in the first direction, which is beneficial for improving space utilization.

[0014] In some embodiments, the second insulating member is bonded to the main body and the first insulating member. This simplifies the connection between the second insulating member and the main body and the first insulating member, and also improves the fixation effect of the second insulating member on the first insulating member.

[0015] In some embodiments, along a first direction, a portion of the second insulating member is located between the first insulating member and the first wall; a portion of the second insulating member is located on at least one side of the first insulating member and the main body along a second direction and is connected to the main body, the second direction being perpendicular to the first direction. The portion of the second insulating member located between the first insulating member and the first wall can bind the first insulating member along the first direction, thereby improving the stability of the first insulating member relative to the main body.

[0016] In some embodiments, the second insulating member includes a first fixing portion and two second fixing portions spaced apart along a second direction. At least a portion of the first fixing portion is located between the first insulating member and the first wall along the first direction. 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 two second fixing portions are respectively connected to both ends of the first fixing portion along the second direction, and the second insulating member is generally U-shaped. 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 on either side along the second direction, and improving the stability of the first insulating member relative to the main body.

[0017] In some embodiments, the orthographic projections of the first through hole and the second insulating member are spaced apart in the same plane perpendicular to the first direction. This helps to reduce interference between the second insulating member and the first conductive part, and facilitates the smooth passage of a portion of the first conductive part through the first wall.

[0018] In some embodiments, the first insulating member has an exhaust hole extending through a first direction. In the same plane perpendicular to the first direction, at least a portion of the orthographic projection of the exhaust hole and the orthographic projection of the second insulating member are spaced apart. Since at least a portion of the exhaust hole is not covered or blocked by the second insulating member, this helps to reduce the impact of the second insulating member's arrangement on the smoothness of exhaust flow inside the housing.

[0019] In some embodiments, the first wall is provided with an injection hole, and in the same plane perpendicular to the first direction, the orthographic projection of the second insulating member and the orthographic projection of the injection hole at least partially overlap. The second insulating member can block at least part of the electrolyte injected from the injection hole, reducing the impact of the electrolyte on the main body, reducing the risk of active material falling off the main body, and improving the reliability of the battery cell.

[0020] In some embodiments, the first insulating member has a second through hole extending along a first direction, and the first conductive part passes through the second through hole; in the same plane perpendicular to the first direction, the orthographic projections of the second insulating member and the second through hole are spaced apart. The second through hole provides clearance for the first conductive part. The second insulating member does not cover the second through hole, which can reduce interference between the second insulating member and the first conductive part and reduce the adverse effects of the second insulating member on the first conductive part.

[0021] In some embodiments, the dimension of the portion of the second insulating member overlapping the main body in the second direction along the first direction is L1, and the dimension of the main body in the first direction is L2, where L1 ≥ 5 mm and L1 / L2 ≤ 0.5. Setting L1 to be greater than or equal to 5 mm results in a larger dimension of the portion of the second insulating member overlapping the main body in the first direction X, which is beneficial for improving the connection strength between the second insulating member and the main body. Setting L1 / L2 to be less than or equal to 0.5 helps to limit the dimension of the portion of the second insulating member overlapping the main body in the first direction, which helps to reduce assembly difficulty, reduce the probability of wrinkles caused by excessive length of the second insulating member, improve the flatness of the second insulating member, and reduce the space occupied by the second insulating member.

[0022] In some embodiments, the battery cell includes a third insulating member, which covers 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-apart welded portion and the second insulating member can reduce the adverse effects of heat generated during the thermal fusion of the third and first insulating members on the second insulating member, reduce the risk of partial melting of the second insulating member affecting its structural strength, and also reduce 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.

[0023] In some embodiments, the first insulating member includes at least two support portions, with adjacent support portions spaced apart along a third direction, and the support portions abutting against the main body portion, the third direction being perpendicular to the first direction; at least two support portions are thermally fused to the third insulating member. Thus, the third insulating member and the first insulating member have multiple spaced connection points, which helps improve connection reliability and reduces the risk of edge warping of the third insulating member.

[0024] In some embodiments, the first insulating member includes a connecting portion that connects two adjacent supporting portions. Along a first direction, a portion of the supporting portion protrudes from the surface of the connecting portion facing the main body. The supporting portion protrudes from the connecting portion, and its larger surface area along the second and third directions facilitates thermal fusion bonding with the third insulating member, increases the distance between the fused portion and the second insulating member, and reduces the adverse effects of heat during thermal fusion on the second insulating member.

[0025] In some embodiments, the battery cell includes at least two second insulating members, which are respectively connected to at least two support portions. Thus, the at least two support portions can be independently arranged or integrally formed, suitable for fixing first insulating members with different structures.

[0026] In some embodiments, the support portion includes a first surface and two second surfaces disposed opposite each other along a second direction. The first surfaces of two adjacent support portions are disposed opposite each other along a third direction, and the first direction, second direction, and third direction are perpendicular to each other. At least two support portions include a first support portion and a second support portion. Of the first surface and the second surface of the first support portion, only the first surface is connected to the third insulating member, and the second surface of the second support portion is connected to the third insulating member. Along the second direction, a portion of the second insulating member is disposed between the second surface and the third insulating member. The dimension of the second insulating member connected to the first support portion along the third direction is L31, and the dimension of the second insulating member connected to the second support portion along the third direction is L32, where L31 > L32. Setting L31 to be greater than L32, the second insulating member connected to the first support portion has a larger dimension along the third direction, which is beneficial to increasing the connection area between the second insulating member and the first support portion and improving the fixing effect. The second insulating member connected to the second support portion has a smaller dimension along the third direction, which is beneficial to increasing the distance between the second insulating member and the second fusion portion and reducing the adverse effects of heat on the second insulating member during the thermal fusion connection of the third insulating member and the second support portion.

[0027] In some embodiments, the support portion includes a first surface and two second surfaces disposed opposite each other along a second direction. The first surfaces of two adjacent support portions are disposed opposite each other along a third direction, and the first direction, second direction, and third direction are perpendicular to each other. At least two support portions include a first support portion and a second support portion. Of the first surface and the second surface of the first support portion, only the first surface is connected to the third insulating member, and the second surface of the second support portion is connected to the third insulating member. The melting point of the second insulating member connected to the first support portion is T1, and the melting point of the second insulating member connected to the second support portion is T2, where T1 < T2. Setting the melting point of the second insulating member connected to the first support portion to a lower value helps to expand the range of materials that can be selected for the second insulating member and reduce costs. Setting the melting point of the second insulating member connected to the second support portion to a higher value helps to reduce the risk of the second insulating member melting after being heated.

[0028] In some embodiments, along a third direction, the size of the support portion is larger than the size of the second insulating member. The support portion includes a first surface and two second surfaces disposed opposite each other along a second direction. The first surfaces of two adjacent support portions are disposed opposite each other along a third direction, and the first, second, and third directions are perpendicular to each other. Along the second direction, a portion of the second insulating member is disposed between the second surface and the third insulating member. The third insulating member is connected to the first and second surfaces. Along the third direction, the welded portion formed by the connection between the third insulating member and the second surface is farther away from the first surface than the second insulating member. The welded portion of the second surface is farther away from the welded portion of the first surface along the third direction, and the distribution of multiple welded portions is wider, which helps to reduce the risk of localized warping of the third insulating member.

[0029] In some embodiments, the support portion includes a first surface and two second surfaces disposed opposite each other along a second direction. The first surfaces of two adjacent support portions are disposed opposite each other along a third direction, and the first direction, second direction, and third direction are perpendicular to each other. Along the second direction, a portion of a second insulating member is disposed between the second surface and the second insulating member, and the edge of the second insulating member near the first surface is flush with the first surface. The second insulating member can restrain the edge of the first insulating member in the third direction, which helps to improve the phenomenon of edge warping of the first insulating member and improves the fixing effect of the first insulating member.

[0030] In some embodiments, at least a portion of the second insulating member is located between the support and the third insulating member along the second direction. The first, second, and third directions are mutually perpendicular. The dimension of the portion of the second insulating member overlapping the support along the second direction along the third direction is L3, and the dimension of the support along the third direction is L4. L2 ≥ 5 mm, and L3 / L4 ≤ 0.5. Setting L3 to be greater than or equal to 5 mm increases the width of the second insulating member along the third direction, reducing the risk of breakage. Setting L3 / L4 to be less than or equal to 0.5 helps to limit the dimension of the portion of the second insulating member overlapping the support along the third direction, thereby reducing the area of ​​the support covered by the second insulating member and reducing the adverse effects of the second insulating member on the support. For example, it reduces the probability of the second insulating member covering the vent hole, increases the distance between the second insulating member and the welded portion, and reduces the risk of the second insulating member deforming or melting due to heat.

[0031] In some embodiments, the battery cell includes a cover attached to a first wall and extending along the first wall toward the main body, covering a first through-hole. 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.

[0032] 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.

[0033] 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 the space occupied by the electrode terminals within the casing. Welding the cover to the first wall also improves connection strength.

[0034] In some embodiments, the portion of the first conductive part located on the side of the first wall away from the main body is welded to the first wall. This helps to improve the connection strength between the first conductive part and the first wall.

[0035] In some embodiments, the first conductive portion includes a first tab, which passes through 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 connected to the first wall.

[0036] 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 connected to the first wall. The first tab is relatively flexible and typically includes multiple first tab layers. Therefore, it is difficult for the first tab to pass through the first through hole, and the first tab is more prone to cracking due to stress concentration. In this embodiment, the first adapter portion passes through the first through hole, which helps to reduce assembly difficulty, reduce interference between the first tab and the first wall, and reduce the risk of the first tab cracking due to stress concentration.

[0037] 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.

[0038] In some embodiments, the outer casing includes two second walls spaced apart along a second direction, the second direction being perpendicular to the first direction; the first tab includes multiple first tab layers, with the first tab layers of the two first conductive portions respectively converging towards the two second walls. By employing a C-shaped bending method for the first tab, the overall length of the first tab can be extended, giving the first tab a certain degree of redundancy in terms of stretching deformation. This helps to 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.

[0039] In some embodiments, the housing includes a third wall along a first direction, located on the side of the main body away from the first wall; the battery cell includes an electrode terminal located on the third wall; the electrode unit includes a second conductive portion, the second conductive portion having the opposite polarity to the first conductive portion, extending from the main body and electrically connected to the electrode terminal. At least a portion of the first conductive portion and at least a portion of the second conductive portion are respectively located on both sides of the main body along the first direction, occupying space in the first direction and affecting the energy density of the battery cell. Extending a portion of the first conductive portion to the outside of the first wall and electrically connecting it to the first wall helps to eliminate one electrode terminal, reduce the space occupied by the first conductive portion within the housing, reduce welding difficulty, and reduce the impact of both the first and second conductive portions occupying space in the first direction on the energy density of the battery cell.

[0040] 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.

[0041] 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, which is perpendicular to the first direction. The separate disposal of the two second conductive portions of the battery cell helps to reduce the thickness of a single second conductive portion and reduce the space occupied by the second conductive portion in the first direction inside the casing, thereby increasing the energy density of the battery cell.

[0042] In some embodiments, the housing includes a housing and an end cap, the housing having an opening on one side along a first direction, the end cap being connected to the housing and covering the opening; the third wall is the end cap, and the housing is integrally formed and includes the first wall.

[0043] In some embodiments, the housing includes a housing and two end caps, the housing having openings on both sides along a first direction, the two end caps being connected to the housing and respectively covering the two openings; a first wall is one of the end caps, and a third wall is the other end cap.

[0044] 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.

[0045] 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

[0046] 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.

[0047] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0048] Figure 2 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0049] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0050] Figure 4 yes Figure 3 An exploded view of the battery cell shown.

[0051] Figure 5 yes Figure 3 A partial structural diagram of the battery cell is shown.

[0052] Figure 6 yes Figure 5 A magnified view of region A in the middle.

[0053] Figure 7 yes Figure 4 The diagram shows the structure of the first insulating component of the battery cell.

[0054] Figure 8 This is a partial structural schematic diagram of a battery cell provided in other embodiments of this application.

[0055] Figure 9 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application.

[0056] Figure 10 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application.

[0057] Figure 11 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application.

[0058] Figure 12 yes Figure 5 The diagram shows a partial structure of the battery cell and a schematic diagram of the structure after the third insulating component is assembled.

[0059] Figure 13 yes Figure 3 The cross-sectional view of the battery cell shown.

[0060] Figure 14 yes Figure 13 A magnified view of region B in the middle.

[0061] Figure 15 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application.

[0062] The attached figures are labeled as follows:

[0063] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor.

[0064] 5. Box body, 5a. First box body section, 5b. Second box body section, 5c. Accommodation space;

[0065] 6. Battery cell; 10. Electrode unit; 11. Main body; 12. First conductive part; 121. First tab; 122. First adapter part; 1221. Adapter layer; 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. Liquid injection hole; 233. Recess; 24. Second wall; 25. Third wall; 26. Fourth wall. 30. First insulating component; 30a. First end face; 30b. Side face; 31. Support portion; 31a. First surface; 31b. Second surface; 31c. Third surface; 32. Connecting portion; 33. Vent hole; 34. Second through hole; 35. First support portion; 36. Second support portion; 40. Second insulating component; 41. First fixing portion; 42. Second fixing portion; 50. Third insulating component; 60. Electrode terminal; 70. Covering component; 80. Adapter component; 90. Fourth insulating component; N. Welding portion; W. Welding portion; W1. First welding portion; W2. Second welding portion; X. First direction; Y. Second direction; Z. Third direction. Detailed Implementation

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] In this application, "multiple" means two or more (including two).

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] In some implementations, the isolation structure is positioned between the positive and negative electrodes.

[0081] 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.

[0082] 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.

[0083] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0084] In some embodiments, the electrode assembly has a stacked structure.

[0085] 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.

[0086] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0091] The shell wall with electrode terminals and the electrode assembly are usually insulated and isolated by insulating materials such as plastic. Part of the insulating material can be clamped between the electrode terminals and the shell wall. The electrode terminals and the shell wall have the function of restricting and fixing the insulating material.

[0092] Tabs are typically connected directly to electrode terminals or indirectly via adapters. Since tabs and adapters are housed within the casing, they occupy internal space, impacting the energy density of the battery cell. To reduce the space occupied by mechanical components within the casing, the applicant proposes a solution where a portion of the tab or adapter extends beyond the casing and is electrically connected to the casing wall. This not only reduces the space occupied by the tab and / or adapter within the casing but also eliminates the need for electrode terminals. However, eliminating electrode terminals affects the fixation of the insulation components, making them prone to displacement or movement, thus compromising insulation protection. It may also interfere with the tabs, increasing the risk of tab cracking and affecting the reliability of the battery cell.

[0093] In view of this, the present application provides a technical solution that uses an additional second insulating member to fix the first insulating member, used for insulation and isolation, to the main body of the electrode assembly. This helps to limit the displacement and shaking of the first insulating member within the housing, improves the stability of the first insulating member, thereby improving the insulation and isolation 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.

[0094] The technical solutions provided in this application are applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0095] 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.

[0096] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0097] Figure 1 This is a schematic diagram of the vehicle structure 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.

[0098] 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.

[0099] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application. (Refer to...) Figure 2The battery device 2 includes a housing 5 and a battery cell 6, with the battery cell 6 housed within the housing 5. The housing 5 provides a space for the battery cell 6 and can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, together defining a space 5c for accommodating the battery cell 6. The second housing portion 5b may be a hollow structure with one open end, while the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b so that the first housing portion 5a and the second housing portion 5b together define the space 5c. Alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one open side, with the open side of the first housing portion 5a overlapping the open side of the second housing portion 5b. Of course, the box 5 formed by the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.

[0104] 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 4 The 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] The end cap 22 can be connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0113] 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.

[0114] Figure 5 yes Figure 3 A partial structural diagram of a single battery cell is shown. Figure 6 yes Figure 5 An enlarged schematic diagram of region A in the middle. Figure 7 yes Figure 4 The diagram shows the structure of the first insulating component of the battery cell. Figure 8 These are partial structural schematic diagrams 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 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application. Figure 11 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application. Figure 12 yes Figure 5 The diagram shows a partial structure of the battery cell and a schematic diagram of the structure after the third insulating component is assembled. Figure 13 yes Figure 3 The cross-sectional view of the battery cell shown. Figure 14 yes Figure 13 An enlarged schematic diagram of region B in the middle. Figure 15 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application.

[0115] In some embodiments, refer to Figures 3 to 10 The battery cell 6 includes an electrode unit 10, a housing 20, a first insulating member 30, and a second insulating member 40. The housing 20 includes a first wall 23 with a first through-hole 231. The electrode unit 10 includes a main body 11 and a first conductive portion 12. The main body 11 is housed within the housing 20, and the first wall 23 is located on one side of the main body 11 along a first direction X. The first conductive portion 12 is connected to and extends from the main body 11. The first conductive portion 12 passes through the first through-hole 231, and a portion of the first conductive portion 12 is located on the side of the first wall 23 away from the main body 11 along the first direction X and is electrically connected to the first wall 23. At least a portion of the first insulating member 30 is disposed between the main body 11 and the first wall 23 along the first direction X. The second insulating member 40 is configured to fix the first insulating member 30 to the main body 11.

[0116] The first wall 23 can be one of the walls of the housing 21, or it can be an end cap 22. Optionally, in Figure 4 In the embodiment shown, the first wall 23 is an end cap 22.

[0117] 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.

[0118] 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.

[0119] A portion of the first conductive portion 12 is located between the main body portion 11 and the first wall 23. In one example, the first conductive portion 12 extends from the side of the main body portion 11 near the first wall 23 along the first direction X. In other examples, the first conductive portion 12 may also extend from other sides of the main body portion 11, with a portion of the first conductive portion 12 extending to the side of the main body portion 11 near the first wall 23.

[0120] The first conductive portion 12 is the power output structure of the electrode unit 10. 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 also include a transition portion connected to the first tab 121.

[0121] 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.

[0122] In one example, the first tab 121 is a positive tab, and the first tab 121 is connected to the positive current collector body. Optionally, the first tab 121 is integrally formed with the positive current collector body.

[0123] In another example, the first tab 121 is a negative tab, and the first tab 121 is connected to the negative current collector body. Optionally, the first tab 121 is integrally formed with the negative current collector body.

[0124] The first conductive part 12 is directly connected to the first wall 23, or the first conductive part 12 is indirectly connected to the first wall 23 through an intermediate component, so as to establish an electrical connection with the first wall 23 through the intermediate component.

[0125] Optionally, the portion of the first conductive part 12 extending to the outside of the first wall 23 is welded to the first wall 23. This simplifies the structure and improves the connection strength between the first conductive part 12 and the first wall 23. Welding the first conductive part 12 and the first wall 23 to the outside reduces the probability of welding particles falling into the housing 20, thus reducing the risk of short circuits and improving reliability.

[0126] 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 N.

[0127] The first insulating member 30 is used to insulate and isolate the main body 11 and the first wall 23. Optionally, the first insulating member 30 is a plastic part.

[0128] The first insulating element 30 may be connected to the first wall 23 by bonding, heat fusion or other means; the first insulating element 30 may also only contact or abut against the first wall 23; the first insulating element 30 may also be spaced apart from the first wall 23, for example, other components are provided between the first insulating element 30 and the first wall 23.

[0129] The first insulating member 30 may contact or abut against the main body 11, or the first insulating member 30 may be spaced apart from the main body 11. For example, other components may be provided between the first insulating member 30 and the main body 11.

[0130] The second insulating element 40 can be one or more.

[0131] There are several ways in which the second insulating member 40 fixes the first insulating member 30 to the main body 11. The second insulating member 40 may be connected to at least one of the first insulating member 30 and the main body 11, or it may not be connected to either the first insulating member 30 or the main body 11.

[0132] For example, the second insulating member 40 is connected to the first insulating member 30 and the main body 11. The second insulating member 40 may be strip-shaped, U-shaped, L-shaped, ring-shaped or other shapes.

[0133] For example, the second insulating member 40 is U-shaped, surrounds the first insulating member 30 and is connected to the main body 11, thereby confining the first insulating member 30 to the side of the main body 11 near the first wall 23. The second insulating member 40 may or may not be connected to the first insulating member 30.

[0134] For example, the second insulating member 40 is annular and surrounds the first insulating member 30 and the main body 11, tightly binding the first insulating member 30 and the main body 11 together. The second insulating member 40 may not be connected to either the first insulating member 30 or the main body 11.

[0135] A portion of the first conductive part 12 extends through the first wall 23 and is electrically connected to the first wall 23. This reduces the space occupied by the first conductive part 12 within the housing 20 and eliminates the need for traditional electrode terminals. This simplifies the structure of the battery cell 6, saves the space occupied by the electrode terminals within the housing 20, and increases the energy density of the battery cell 6.

[0136] The provision of the second insulating member 40 helps to limit the displacement and shaking of the first insulating member 30 within the housing 20, improving the stability of the first insulating member 30, thereby improving the insulation effect and increasing the reliability of the battery cell 6. Furthermore, the provision of the second insulating member 40 also helps to improve the insulation effect between the main body 11 and the housing 20.

[0137] In some embodiments, the second insulating member 40 is connected to the main body portion 11. This improves the stability of the second insulating member 40 relative to the main body portion 11, thereby enhancing the fixing effect of the second insulating member 40 on the first insulating member 30.

[0138] The connection between the second insulating member 40 and the main body 11 includes, but is not limited to, bonding.

[0139] In one example, the second insulating member 40 is directly connected to the main body portion 11. For example, the second insulating member 40 itself has an adhesive layer that is bonded to the main body portion 11.

[0140] In another example, the second insulating member 40 is indirectly connected to the main body portion 11. For example, the second insulating member 40 and the main body portion 11 are connected by an adhesive, which is bonded to the second insulating member 40 and the main body portion 11.

[0141] In some embodiments, the second insulating member 40 is connected to the first insulating member 30. This improves the stability of the second insulating member 40 relative to the first insulating member 30, thereby enhancing the fixing effect of the second insulating member 40 on the first insulating member 30.

[0142] The connection methods between the second insulating member 40 and the first insulating member 30 include, but are not limited to, bonding or heat fusion.

[0143] In one example, the second insulating member 40 is directly connected to the first insulating member 30. For example, the second insulating member 40 has its own adhesive layer, which is bonded to the first insulating member 30. For example, the second insulating member 40 is directly heat-fused to the first insulating member 30.

[0144] In another example, the second insulating member 40 is indirectly connected to the main body 11. For example, the second insulating member 40 and the first insulating member 30 are connected by an adhesive, which is bonded to the second insulating member 40 and the first insulating member 30.

[0145] In some embodiments, refer to Figures 6 to 11The first insulating member 30 has a first end face 30a and a side face 30b. The first end face 30a faces the first wall 23 along the first direction X, and the side face 30b intersects with the first end face 30a. The second insulating member 40 connects the side face 30b and the main body 11.

[0146] The first end face 30a can be a single surface or include multiple surfaces.

[0147] Side surface 30b is connected to first end face 30a. The angle between side surface 30b and first end face 30a can be 90° or less than 90°.

[0148] Side 30b includes a surface of the first insulating member 30 along the second direction Y and a surface of the first insulating member 30 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 40 may be connected to any one or more surfaces of the first insulating member 30 in the second direction Y and the third direction Z.

[0149] In one example, refer to Figure 10 and Figure 11 In the same plane perpendicular to the first direction X, the orthographic projections of the second insulating member 40 and the first insulating member 30 are spaced apart. For example, refer to... Figure 11 The second insulating member 40 can be a strip structure integrally disposed on either side of the first insulating member 30 and the main body 11 along the second direction Y or the third direction Z. (Refer to...) Figure 10 The second insulating member 40 may also be an L-shaped, U-shaped or ring-shaped structure surrounding the main body 11 and the first insulating member 30 in a plane perpendicular to the first direction X.

[0150] In another example, refer to Figure 6 , Figure 8 and Figure 9 A portion of the second insulating member 40 is located between the first end face 30a and the first wall 23. The second insulating member 40 may or may not be connected to the first end face 30a. For example, the second insulating member 40 may be an L-shaped or U-shaped structure.

[0151] The second insulating member 40 connects the side 30b and the main body 11. The second insulating member 40 can be a strip, U-shaped, L-shaped or ring-shaped structure, which helps to improve the selection flexibility of the first insulating member 30.

[0152] In some embodiments, refer to Figures 6 to 10The first insulating member 30 includes at least two support portions 31, with adjacent support portions 31 spaced apart along a third direction Z. The support portions 31 are used to abut against the main body portion 11. Each support portion 31 includes a first surface 31a and two opposing second surfaces 31b along a second direction Y. The first surfaces 31a of adjacent support portions 31 are arranged opposite each other along a third direction Z. The side surface 30b includes a first surface 31a and a second surface 31b. The second insulating member 40 is connected to at least one of the first surface 31a and the second surface 31b. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0153] Two adjacent support portions 31 can be connected by other parts of the first insulating member 30, or the two support portions 31 can be two separate and independent parts.

[0154] The first direction X is parallel to the thickness direction of the first wall 23. One of the second direction Y and the third direction Z is parallel to the length direction of the first wall 23, and the other is parallel to the width direction of the first wall 23. For example, in... Figures 6 to 11 In the embodiment shown, the second direction Y is parallel to the width direction of the first wall 23, and the third direction Z is parallel to the length direction of the first wall 23.

[0155] Reference Figure 7 The support portion 31 also includes a third surface 31c, and the third surfaces 31c of the two support portions 31 are disposed opposite each other along the third direction Z. The first surface 31a is the surface of the support portion 31 that is away from the other support portion 31 along the third direction Z. The third surface 31c is the surface of the support portion 31 that faces the other support portion 31 along the third direction Z. The second surface 31b connects the first surface 31a and the third surface 31c.

[0156] The side surface 30b includes a first surface 31a and a second surface 31b of each support portion 31.

[0157] In one example, the second insulating member 40 is one, and the second insulating member 40 is connected to the first surface 31a and / or the second surface 31b of any support portion 31, or the second insulating member 40 is connected to the first surface 31a and / or the second surface 31b of each support portion 31.

[0158] In another example, there are two second insulating members 40, which are respectively connected to the first surface 31a and / or the second surface 31b of the two support portions 31.

[0159] In one example, refer to Figures 8 to 10 At least a portion of the second insulating member 40 is located on at least one side of the first insulating member 30 and the main body 11 along the third direction Z, and the second insulating member 40 is connected to the first surface 31a.

[0160] In another example, refer to Figure 6 and Figure 11 At least a portion of the second insulating member 40 is located on at least one side of the first insulating member 30 and the main body 11 along the second direction Y, and the second insulating member 40 is connected to the second surface 31b.

[0161] In yet another example, refer to Figure 10 A portion of the second insulating member 40 is located on at least one side of the first insulating member 30 and the main body 11 along the third direction Z, and another portion of the second insulating member 40 is located on at least one side of the first insulating member 30 and the main body 11 along the second direction Y. The second insulating member 40 is connected to the first surface 31a and the second surface 31b.

[0162] The second insulating member 40 is connected to the first surface 31a and / or the second surface 31b of the two support portions 31, which helps to increase the connection area between the second insulating member 40 and the first insulating member 30 and improve the fixing effect of the second insulating member 40 on the first insulating member 30. The support portion 31 is used to abut against the main body portion 11 to limit the shaking of the main body portion 11.

[0163] In some embodiments, refer to Figure 7 The first insulating member 30 includes a connecting portion 32, which connects two adjacent support portions 31. Along the first direction X, a portion of the support portion 31 protrudes from the surface of the connecting portion 32 facing the main body portion 11.

[0164] Optionally, the connecting part 32 and the supporting part 31 are integrally formed.

[0165] Optionally, the connecting part 32 is plate-shaped or sheet-shaped.

[0166] Optionally, the support portion 31 is in contact with the main body portion 11, which helps to reduce the shaking of the main body portion 11.

[0167] The two support parts 31 are connected by the connecting part 32 to form a whole, which is not only conducive to assembly, but also to fixing the entire first insulating part 30 to the main body part 11 by the second insulating part 40.

[0168] The support portion 31 is closer to the main body portion 11 than the connecting portion 32, and can form an accommodating space on the side of the connecting portion 32 facing the main body portion 11 to accommodate a part of the first conductive portion 12. The first conductive portion 12 and the first insulating member 30 share a portion of the space in the first direction X, which is beneficial to improving space utilization.

[0169] In some embodiments, the second insulating member 40 is bonded to the main body 11 and the first insulating member 30. This simplifies the connection between the second insulating member 40 and the main body 11 and the first insulating member 30, and also improves the fixing effect of the second insulating member 40 on the first insulating member 30.

[0170] The second insulating member 40 includes a base layer and an adhesive layer, the adhesive layer being bonded to the main body 11 and the first insulating member 30.

[0171] In some embodiments, refer to Figure 6 Along the first direction X, a portion of the second insulating member 40 is located between the first insulating member 30 and the first wall 23. A portion of the second insulating member 40 is located on at least one side of the first insulating member 30 and the main body 11 along the second direction Y, and is connected to the main body 11, the second direction Y being perpendicular to the first direction X.

[0172] The second direction Y is parallel to the length or width direction of the first wall 23. Optionally, in Figure 6 In the embodiment shown, the second direction Y is parallel to the width direction of the first wall 23. In this way, the surface of the main body 11 along the second direction Y is a surface with a large area, which is beneficial to increase the connection area between the second insulating member 40 and the main body 11 and improve the connection strength.

[0173] In one example, another part of the second insulating member 40 is provided only on one side of the first insulating member 30 and the main body 11 along the second direction Y, and the second insulating member 40 is generally L-shaped.

[0174] In another example, another part of the second insulating member 40 includes two sub-parts, one sub-part being disposed on one side of the first insulating member 30 and the main body 11 along the second direction Y, and the other sub-part being disposed on the other side of the first insulating member 30 and the main body 11 along the second direction Y.

[0175] The portion of the second insulating member 40 located between the first insulating member 30 and the first wall 23 can bind the first insulating member 30 along the first direction X, thereby improving the stability of the first insulating member 30 relative to the main body 11.

[0176] In some embodiments, refer to Figure 6 The second insulating member 40 includes a first fixing portion 41 and two second fixing portions 42 spaced apart along the second direction Y. At least a portion of the first fixing portion 41 is located between the first insulating member 30 and the first wall 23 along the first direction X, and the first fixing portion 41 connects to the two second fixing portions 42. The two second fixing portions 42 are respectively connected to two opposing surfaces of the main body 11 along the second direction Y.

[0177] The first fixing part 41 may be connected to the first insulating member 30 by adhesive or other means. Alternatively, the first fixing part 41 may only contact the first insulating member 30 without being connected to it. Optionally, the first fixing part 41 may be bonded to the first end face 30a.

[0178] The second fixing part 42 may be connected to the first insulating member 30 by adhesive or other means, or it may not be connected to the first insulating member 30. Optionally, the second fixing part 42 may be adhesively attached to the side surface 30b.

[0179] Along the second direction Y, a portion of the second fixing part 42 overlaps with the main body part 11. The overlapping portions of the two second fixing parts 42 and the main body part 11 may have the same or different dimensions along the first direction X.

[0180] Two second fixing parts 42 are respectively connected to the two ends of the first fixing part 41 along the second direction Y, and the second insulating member 40 is U-shaped as a whole. The second insulating member 40 is an integral structure, which helps to simplify the structure and assembly of the second insulating member 40. Both second fixing parts 42 are connected to the main body 11, and the second insulating member 40 can exert a balanced binding effect on the first insulating member 30, reducing the possibility of the first insulating member 30 shifting or tilting on either side along the second direction Y, and improving the stability of the first insulating member 30 relative to the main body 11.

[0181] In some embodiments, the orthographic projections of the first through hole 231 and the second insulating member 40 are spaced apart in the same plane perpendicular to the first direction X. Optionally, the orthographic projections of the first fixing part 41 and the first through hole 231 are spaced apart. This helps to reduce interference between the second insulating member 40 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.

[0182] In some embodiments, refer to Figure 6 and Figure 7 The first insulating member 30 is provided with an exhaust hole 33 that extends through the first direction X. In the same plane perpendicular to the first direction X, at least a portion of the orthographic projection of the exhaust hole 33 and the orthographic projection of the second insulating member 40 are spaced apart.

[0183] The vent 33 connects to the spaces on both sides of the first insulating member 30 along the first direction X to facilitate smooth venting. For example, the support portion 31 is close to the main body portion 11, and the support portion 31 may obstruct the venting of gas inside the main body portion 11. The vent 33 penetrates the support portion 31, allowing gas inside the main body portion 11 to be vented through the vent 33.

[0184] At least some of the vent holes 33 are not covered or blocked by the second insulating member 40, which helps to reduce the impact of the second insulating member 40 on the smoothness of venting inside the housing 20.

[0185] In some embodiments, refer to Figure 4 The first wall 23 is provided with a liquid injection hole 232. In the same plane perpendicular to the first direction X, the orthographic projection of the second insulating member 40 and the orthographic projection of the liquid injection hole 232 at least partially overlap.

[0186] Optionally, in the same plane perpendicular to the first direction X, the orthographic projection of the injection hole 232 is located within the orthographic projection of the second insulating member 40.

[0187] The second insulating member 40 can block at least part of the electrolyte injected from the injection hole 232, reduce the impact of the electrolyte on the main body 11, reduce the risk of the active material of the main body 11 falling off, and improve the reliability of the battery cell 6.

[0188] In some embodiments, refer to Figure 6 The first insulating member 30 is provided with a second through hole 34 extending along the first direction X, and the first conductive part 12 passes through the second through hole 34. In the same plane perpendicular to the first direction X, the orthographic projection of the second insulating member 40 and the orthographic projection of the second through hole 34 are arranged at intervals.

[0189] Optionally, the second through hole 34 penetrates the connecting portion 32.

[0190] A portion of the first conductive part 12 passes sequentially through the second through hole 34 and the first through hole 231 and extends to the outer side of the first wall 23 away from the main body 11. The second through hole 34 provides clearance for the first conductive part 12. The second insulating member 40 does not cover the second through hole 34, which can reduce the interference between the second insulating member 40 and the first conductive part 12 and reduce the adverse effects of the second insulating member 40 on the first conductive part 12.

[0191] In some embodiments, refer to 4 and Figure 6 The second insulating member 40 overlaps with the main body 11 along the second direction Y with a dimension L1 along the first direction X, and the main body 11 has a dimension L2 along the first direction X. L1 ≥ 5 mm and L1 / L2 ≤ 0.5.

[0192] Optionally, L1 / L2 is 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5 or any two of these values.

[0193] In this embodiment, L1 is set to be greater than or equal to 5 mm. The portion of the second insulating member 40 overlapping with the main body 11 has a larger dimension along the first direction X, which is beneficial to improving the connection strength between the second insulating member 40 and the main body 11. In this embodiment, L1 / L2 is set to be less than or equal to 0.5, which is beneficial to limiting the dimension of the portion of the second insulating member 40 overlapping with the main body 11 along the first direction X. This helps to reduce assembly difficulty, reduce the probability of wrinkles caused by excessive length of the second insulating member 40, improve the flatness of the second insulating member 40, and reduce the space occupied by the second insulating member 40.

[0194] In some embodiments, refer to Figure 6 and Figure 12 , Figure 6The circular dashed line in the diagram indicates the approximate location of the welded portion W. The battery cell 6 includes a third insulating member 50, which covers the outer side of the main body 11 and is thermally fused with the first insulating member 30 to form the welded portion W. The first insulating member 30 has a first end face 30a and a side face 30b. The first end face 30a faces the first wall 23 along a first direction X, and the side face 30b intersects with the first end face 30a. At least a portion of the second insulating member 40 is located between the side face 30b and the third insulating member 50, and the welded portion W is spaced apart from the second insulating member 40.

[0195] The third insulating member 50 is used to insulate and isolate the main body 11 and the outer casing 20. The third insulating member 50 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 50 extends beyond the main body 11 and is connected to the first insulating member 30 in the direction from the main body 11 to the first wall 23.

[0196] Optionally, the third insulating element 50 includes an insulating film.

[0197] The second insulating member 40 may be entirely located between the side surface 30b and the third insulating member 50, or only a portion of the second insulating member 40 may be located between the side surface 30b and the third insulating member 50. The third insulating member 50 covers at least a portion of the second insulating member 40, which helps to improve the fixing effect of the second insulating member 40 on the first insulating member 30.

[0198] After the second insulating member 40 fixes the first insulating member 30 to the main body 11, the third insulating member 50 covers the outside of the main body 11 and is connected to the first insulating member 30. This can reduce the displacement of the first insulating member 30 relative to the main body 11 during the assembly of the third insulating member 50 and facilitate the connection between the third insulating member 50 and the first insulating member 30.

[0199] The welded portion W and the second insulating member 40 are spaced apart, meaning that the welded portion W and the second insulating member 40 are separate from each other. The welded portion W and the second insulating member 40 are spaced apart along the second direction Y, or the welded portion W and the second insulating member 40 are spaced apart along the third direction Z. The third insulating member 50 is welded to the portion of the first insulating member 30 that does not overlap with the second insulating member 40.

[0200] The welded portion W is spaced apart from the second insulating member 40, which can reduce the adverse effects of the heat generated during the thermal fusion connection of the third insulating member 50 and the first insulating member 30 on the second insulating member 40, reduce the risk of the second insulating member 40 being partially melted and affecting its structural strength, and also reduce the risk of the third insulating member 50 being damaged by the warping caused by the partial melting of the second insulating member 40 or causing the third insulating member 50 to warp.

[0201] In some embodiments, refer to Figure 6 and Figure 12 The first insulating member 30 includes at least two support portions 31, with adjacent support portions 31 spaced apart along a third direction Z, which is perpendicular to the first direction X. The at least two support portions 31 are thermally fused to the third insulating member 50. This arrangement provides multiple, spaced connection points between the third insulating member 50 and the first insulating member 30, which improves connection reliability and reduces the risk of edge warping of the third insulating member 50.

[0202] Optionally, the third direction Z is parallel to the length direction of the first wall 23. The third insulating member 50 has a larger dimension along the third direction Z, and its edges are more prone to warping. At least two support portions 31, spaced apart along the third direction Z, are connected to the third insulating member 50, which helps to reduce the risk of the edges of the third insulating member 50 warping.

[0203] Optionally, each support 31 is thermally fused to the third insulating member 50.

[0204] In some embodiments, the first insulating member 30 includes a connecting portion 32 that connects two adjacent support portions 31. Along a first direction X, a portion of the support portion 31 protrudes from the surface of the connecting portion 32 facing the main body portion 11.

[0205] A portion of the support portion 31 protrudes from the connecting portion 32. The support portion 31 has a larger surface area along the second direction Y and along the third direction Z, which is more conducive to thermal fusion connection with the third insulating member 50 and increases the distance between the fusion portion W and the second insulating member 40, thereby reducing the adverse effects of heat during thermal fusion on the second insulating member 40.

[0206] In some embodiments, the battery cell 6 includes at least two second insulating members 40, which are respectively connected to at least two support portions 31. Each support portion 31 is connected to one or more second insulating members 40.

[0207] The structures of at least two second insulating elements 40 may be the same or different.

[0208] In one example, two adjacent support portions 31 are connected by a connecting portion 32, and each second insulating member 40 constrains the first insulating member 30. The combination of at least two second insulating members 40 is beneficial to improving the fixing effect on the first insulating member 30.

[0209] In another example, at least two support portions 31 are provided separately and independently. Each support portion 31 is fixed to the main body portion 11 by one or more second insulating members 40.

[0210] At least two second insulating members 40 are respectively connected to at least two support parts 31, so that the at least two support parts 31 can be set independently or integrally formed, which is suitable for fixing the first insulating members 30 with different structures.

[0211] In some embodiments, refer to Figure 6 and Figure 12 The support portion 31 includes a first surface 31a and two second surfaces 31b disposed opposite each other along the second direction Y. The first surfaces 31a of two adjacent support portions 31 are disposed opposite each other along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. At least two support portions 31 include a first support portion 35 and a second support portion 36. Of the first surfaces 31a and 31b of the first support portion 35, only the first surface 31a is connected to the third insulating member 50. The second surfaces 31b of the second support portion 36 are connected to the third insulating member 50. Along the second direction Y, a portion of the second insulating member 40 is disposed between the second surfaces 31b and the third insulating member 50. The second insulating member 40 connected to the first support portion 35 has a dimension L31 along the third direction Z, and the second insulating member 40 connected to the second support portion 36 has a dimension L32 along the third direction Z, where L31 > L32.

[0212] Optionally, a portion of the second fixing part 42 is disposed between the second surface 31b and the third insulating member 50.

[0213] In the first surface 31a and the second surface 31b of the first support portion 35, the fact that only the first surface 31a is connected to the third insulating member 50 means that the third insulating member 50 is not connected to the second surface 31b of the first support portion 35.

[0214] The first surface 31a of the second support portion 36 may be connected to the third insulating member 50, or it may not be connected to the third insulating member 50.

[0215] The third insulating member 50 is thermally fused to the first surface 31a of the first support portion 35 to form a first fused portion W1. The first fused portion W1 and the second insulating member 40 are located on different sides of the first support portion 35, and the heat during the thermal fusion process is unlikely to affect the second insulating member 40. The third insulating member 50 is thermally fused to the second surface 31b of the second support portion 36 to form a second fused portion W2. The second fused portion W2 and at least a portion of the second insulating member 40 are located on the same side of the first support portion 35 along the second direction Y, and the heat during the thermal fusion process is likely to affect the second insulating member 40.

[0216] In this embodiment, L31 is set to be greater than L32. The second insulating member 40 connected to the first support 35 has a larger dimension along the third direction Z, which is beneficial to increasing the connection area between the second insulating member 40 and the first support 35 and improving the fixing effect. The second insulating member 40 connected to the second support 36 has a smaller dimension along the third direction Z, which is beneficial to increasing the distance between the second insulating member 40 and the second fusion portion W2 and reducing the adverse effects of heat on the second insulating member 40 during the thermal fusion connection of the third insulating member 50 and the second support 36.

[0217] In some embodiments, refer to Figure 6 The support portion 31 includes a first surface 31a and two second surfaces 31b disposed opposite each other along the second direction Y. The first surfaces 31a of two adjacent support portions 31 are disposed opposite each other along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. At least two support portions 31 include a first support portion 35 and a second support portion 36. Of the first surfaces 31a and 31b of the first support portion 35, only the first surface 31a is connected to the third insulating member 50. The second surfaces 31b of the second support portion 36 are connected to the third insulating member 50. The melting point of the second insulating member 40 connected to the first support portion 35 is T1, and the melting point of the second insulating member 40 connected to the second support portion 36 is T2, where T1 < T2.

[0218] The third insulating member 50 is thermally fused to the first surface 31a of the first support portion 35 to form a first welded portion W1. The first welded portion W1 and the second insulating member 40 are located on different sides of the first support portion 35, so the heat during thermal fusion is unlikely to affect the second insulating member 40. In this embodiment, the melting point of the second insulating member 40 connected to the first support portion 35 is set to be lower, which is beneficial to expanding the range of materials that can be selected for the second insulating member 40 and reducing costs.

[0219] The third insulating member 50 is thermally fused with the second surface 31b of the second support portion 36 to form a second welded portion W2. At least a portion of the second welded portion W2 and the second insulating member 40 are located on the same side of the first support portion 35 along the second direction Y, making it easy for the heat generated during thermal fusion to affect the second insulating member 40. In this embodiment, the melting point of the second insulating member 40 connected to the second support portion 36 is set higher, which helps reduce the risk of the second insulating member 40 melting after being heated.

[0220] In some embodiments, along the third direction Z, the size of the support portion 31 is larger than the size of the second insulating member 40. The support portion 31 includes a first surface 31a and two second surfaces 31b disposed opposite each other along the second direction Y. The first surfaces 31a of two adjacent support portions 31 are disposed opposite each other along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Along the second direction Y, a portion of the second insulating member 40 is disposed between the second surface 31b and the third insulating member 50. The third insulating member 50 is connected to the first surface 31a and the second surface 31b. Along the third direction Z, the welded portion W formed by the connection of the third insulating member 50 and the second surface 31b is further away from the first surface 31a than the second insulating member 40.

[0221] The third insulating member 50 is connected to the first surface 31a and the second surface 31b, which can increase the number of welded parts W, improve the connection reliability, and reduce the risk of edge warping of the third insulating member 50.

[0222] The second insulating member 40 is closer to the first surface 31a than the third insulating member 50 and the welded portion W formed by the connection of the second insulating member 40 and the second surface 31b. The welded portion W of the second surface 31b is farther away from the welded portion W of the first surface 31a along the third direction Z. The distribution of multiple welded portions W is wider, which helps to reduce the risk of localized lifting of the third insulating member 50.

[0223] In some embodiments, refer to Figure 6 The support portion 31 includes a first surface 31a and two second surfaces 31b disposed opposite each other along the second direction Y. The first surfaces 31a of two adjacent support portions 31 are disposed opposite each other along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Along the second direction Y, a portion of the second insulating member 40 is disposed between the second surface 31b and the second insulating member 40, and the edge of the second insulating member 40 near the first surface 31a is flush with the first surface 31a. In this way, the second insulating member 40 can restrain the edge of the first insulating member 30 in the third direction Z, which helps to improve the phenomenon of the edge of the first insulating member 30 lifting and improves the fixing effect of the first insulating member 30.

[0224] In some embodiments, refer to Figure 6 and Figure 7 Along the second direction Y, at least a portion of the second insulating member 40 is located between the support portion 31 and the third insulating member 50, with the first direction X, the second direction Y, and the third direction Z being mutually perpendicular. The portion of the second insulating member 40 that overlaps with the support portion 31 along the second direction Y has a dimension L3 along the third direction Z, and the support portion 31 has a dimension L4 along the third direction Z, where L3 ≥ 5 mm and L3 / L4 ≤ 0.5.

[0225] Optionally, L3 / L4 is 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5 or any two of these values.

[0226] In this embodiment, setting L3 to be greater than or equal to 5 mm increases the width of the second insulating member 40 along the third direction Z, reducing the risk of breakage of the second insulating member 40. Setting L3 / L4 to be less than or equal to 0.5 helps limit the dimension of the portion of the second insulating member 40 overlapping with the support portion 31 along the third direction Z, thereby reducing the area of ​​the support portion 31 covered by the second insulating member 40 and minimizing the adverse effects of the second insulating member 40 on the support portion 31. For example, it reduces the probability of the second insulating member 40 covering the vent hole 33, increases the distance between the second insulating member 40 and the welded portion W, and reduces the risk of the second insulating member 40 deforming or melting due to heat.

[0227] In some embodiments, refer to Figure 4 , Figure 13 and Figure 14 The battery cell 6 includes a cover 70, which is connected to the first wall 23 and covers the first through hole 231 along the direction from the first wall 23 toward the main body 11. The cover 70 can prevent external particles, water and other impurities from entering the casing 20 through the first through hole 231, causing pollution or short circuit risk.

[0228] The cover 70 can be a conductive component or an insulating component.

[0229] Along the direction from the first wall 23 to the main body 11, the cover 70 covers the portion of the first conductive part 12 located on the side of the first wall 23 away from the main body 11.

[0230] In some embodiments, refer to Figure 4 , Figure 13 and Figure 14 Along the first direction X, a recess 233 is provided on the side of the first wall 23 away from the main body 11, a first through hole 231 is connected to the recess 233, and a part of the first conductive part 12 and at least a part of the cover 70 are accommodated in the recess 233.

[0231] Optionally, the first through hole 231 penetrates the bottom wall or side wall of the recess 233.

[0232] 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 233. The cover 70 may be entirely accommodated within the recess 233, or only a portion of the cover 70 may be accommodated within the recess 233, with another portion of the cover 70 protruding, for example, from the recess 233.

[0233] The recess 233 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 70. This helps to reduce the extra space occupied by the cover 70 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.

[0234] In some embodiments, the cover 70 is welded to the first wall 23 and is used to connect to the busbar component.

[0235] The cover 70 includes a conductive material. The material of the cover 70 may be the same as or different from that of the first wall 23.

[0236] The cover 70 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 saves the space occupied by the electrode terminals inside the housing 20. The cover 70 is welded to the first wall 23, which helps to improve the connection strength.

[0237] In some embodiments, refer to Figure 14 The portion of the first conductive part 12 located on the side of the first wall 23 away from the main body 11 is welded to the first wall 23. This helps to improve the connection strength between the first conductive part 12 and the first wall 23.

[0238] The first conductive part 12 and the first wall 23 are welded to form a welded part N, and the cover 70 covers the welded part N in the direction from the first wall 23 to the main body part 11.

[0239] In some embodiments, refer to Figure 13 and Figure 14 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 connected to the first wall 23.

[0240] Optionally, the portion of the first adapter 122 located on the side of the first wall 23 away from the main body 11 is welded to the first wall 23 to form a welded portion N.

[0241] 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.

[0242] 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 electrode tab 121. A portion of the first adapter 122 extends out of the first through hole 231 and is connected to the first wall 23.

[0243] 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.

[0244] In some embodiments, refer to Figure 14 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.

[0245] 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.

[0246] The welding methods for the transition layer 1221 and the first tab 121 include, but are not limited to, ultrasonic welding or laser welding.

[0247] The thicknesses of the two transition layers 1221 can be the same or different.

[0248] 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.

[0249] In some embodiments, the two transition layers 1221 are partially stacked and welded to the first wall 23 on the side of the first wall 23 away from the main body 11.

[0250] The welding methods for the transition layer 1221 and the first wall 23 include, but are not limited to, ultrasonic welding or laser welding.

[0251] The two transition layers 1221 are stacked and welded to the first wall 23, which is beneficial to the welding strength and stability.

[0252] In other embodiments, reference is made to Figure 15The first conductive part 12 includes a first tab 121, which is disposed in 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 connected to the first wall 23.

[0253] Optionally, the portion of the first tab 121 located on the side of the first wall 23 away from the main body 11 is welded to the first wall 23 to form a welded portion N.

[0254] In some embodiments, refer to Figure 13 and Figure 14 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] In some embodiments, refer to Figure 13 and Figure 14 The outer casing 20 includes two second walls 24 disposed along a second direction Y, which is perpendicular to the first direction X. The first conductive part 12 includes a first tab 121 connected to the main body part 11. The first tab 121 includes a plurality of first tab layers (not shown in the figure), and the first tab layers of the two first conductive parts 12 are respectively converged toward the two second walls 24.

[0261] The second direction Y is parallel to the thickness direction of electrode unit 10.

[0262] Multiple first tab layers of the same first conductive part 12 are stacked together in a direction close to the same second wall 24, and then extend in a direction gradually away from the second wall 24. The portion of the first tab 121 located inside the outer casing 20 is generally C-shaped.

[0263] 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.

[0264] In some embodiments, refer to Figure 4 and Figure 13 The outer casing 20 includes a third wall 25, and the main body 11 is disposed between the first wall 23 and the third wall 25 along the first direction X. The battery cell 6 includes an electrode terminal 60 disposed on the third wall 25. The electrode unit 10 includes a second conductive part 13, which extends from the main body 11 and is electrically connected to the electrode terminal 60.

[0265] At least a portion of the second conductive portion 13 is located between the main body portion 11 and the third wall 25. In one example, the second conductive portion 13 extends from the side of the main body portion 11 near the third wall 25 along a first direction X. In other examples, the second conductive portion 13 may also extend from other sides of the main body portion 11, with a portion of the second conductive portion 13 extending to the side of the main body portion 11 near the third wall 25.

[0266] The second conductive part 13 is the power extraction structure of the electrode unit 10. The first conductive part 12 and the second conductive part 13 have opposite polarities.

[0267] 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 second tab 131.

[0268] The first electrode 121 and the second electrode 131 have opposite polarities. One of the first electrode 121 and the second electrode 131 is a positive electrode and is connected to the positive current collector, while the other of the first electrode 121 and the second electrode 131 is a negative electrode and is connected to the negative current collector.

[0269] At least a portion of the first conductive part 12 and at least a portion of the second conductive part 13 are located on both sides of the main body 11 along the first direction X, respectively occupying space in the first direction X and affecting the energy density of the battery cell 6. In this embodiment, a portion of the first conductive part 12 extends to the outside of the first wall 23 and is electrically connected to the first wall 23. This helps to eliminate one electrode terminal, reduce the space occupied by the first conductive part 12 in the housing 20, reduce welding difficulty, and reduce the impact of the space occupied by the first conductive part 12 and the second conductive part 13 in the first direction X on the energy density of the battery cell 6.

[0270] In some embodiments, the second conductive portion 13 includes a second tab 131 connected to the main body portion 11. The battery cell 6 includes an adapter 80 connecting the second tab 131 and the electrode terminal 60.

[0271] The adapter 80 is welded to the second electrode lug 131, and the adapter 80 is welded to the electrode terminal 60.

[0272] 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.

[0273] In some embodiments, refer to Figure 13 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.

[0274] In one example, the second conductive part 13 further includes a second adapter part, which is soldered to the second tab 131 and the electrode terminal 60.

[0275] In another 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.

[0276] In one example, refer to Figure 13 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.

[0277] 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.

[0278] 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.

[0279] In some embodiments, refer to Figure 4 and Figure 13 The battery cell 6 includes a fourth insulating member 90, at least a portion of which is disposed between the main body 11 and the third wall 25. The fourth insulating member 90 serves to insulate and isolate the main body 11 and the third wall 25.

[0280] In some embodiments, refer to Figure 4 The outer casing 20 includes a casing 21 and two end caps 22. The casing 21 has casing openings 211 on both sides along the first direction X. The two end caps 22 are connected to the casing 21 and cover the two casing openings 211 respectively. The first wall 23 is one of the end caps 22, and the third wall 25 is the other end cap 22.

[0281] During assembly, first weld the second conductive part 13 to the electrode terminal 60, or first weld the adapter 80 to the second conductive part 13 and the electrode terminal 60; then, install the electrode unit 10 into the housing 21 and weld the third wall 25 to the housing 21; after the electrode unit 10 is installed in the housing, pass a portion of the first conductive part 12 through the first through hole 231 of the first wall 23, weld the first wall 23 to the housing 21, and weld the first conductive part 12 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 70 can be connected to the first wall 23 to cover the first through hole 231.

[0282] 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.

[0283] In other embodiments, the housing 20 includes a housing 21 and an end cap 22. The housing 21 has a housing opening 211 on one side along the first direction X, and the end cap 22 is connected to the housing 21 and covers the housing opening 211. The third wall 25 is the end cap 22, and the housing 21 is integrally formed and includes a first wall 23.

[0284] 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 third wall 25 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 is passed 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 70 can be connected to the first wall 23 to cover the first through hole 231.

[0285] In some embodiments, refer to Figure 4 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 second walls 24, and the fourth walls 26 connect to the first wall 23 and the third wall 25. Optionally, the two second walls 24 and the two fourth walls 26 are integrally formed to form the casing 21. The first wall 23, serving as one end cap 22, is welded to the casing 21, and the third wall 25, serving as the other end cap 22, is welded to the casing 21.

[0286] 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.

[0287] 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.

[0288] This application provides a battery cell 6, which includes an electrode unit 10, a housing 20, a first insulating member 30, and a second insulating member 40. The housing 20 includes a first wall 23 with two first through holes 231. The electrode unit 10 includes a main body 11 and two first conductive parts 12. The main body 11 is housed within the housing 20, and the first wall 23 is located on one side of the main body 11 along a first direction X. The first conductive parts 12 are connected to and extend from the main body 11. The first conductive parts 12 include a first tab 121 and a first adapter 122. The first tab 121 is connected to the main body 11, and the first adapter 122 is welded to the first tab 121. The first adapter 122 passes through the first through holes 231, and a portion of the first adapter 122 is located on the side of the first wall 23 away from the main body 11 and is connected to the first wall 23. At least a portion of the first insulating member 30 is disposed between the main body 11 and the first wall 23 along the first direction X. The second insulating member 40 is connected to the first insulating member 30 and the main body 11 to fix the first insulating member 30 to the main body 11. The first wall 23 is provided with an injection hole 232. In the same plane perpendicular to the first direction X, the orthographic projection of the second insulating member 40 and the orthographic projection of the injection hole 232 at least partially overlap. The orthographic projection of the first conductive part 12 and the orthographic projection of the second insulating member 40 are spaced apart. The first adapter part 122 includes two adapter layers 1221. The end of the first electrode 121 away from the main body 11 is located between the two adapter layers 1221 and is welded to the two adapter layers 1221.

[0289] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: An electrode unit includes a main body portion and a first conductive portion connected to and extending from the main body portion; The housing includes a main body portion housed within the housing. The housing includes a first wall located on one side of the main body portion along a first direction. The first wall has a first through hole. A first conductive portion passes through the first through hole. A portion of the first conductive portion is located on the side of the first wall away from the main body portion along the first direction and is electrically connected to the first wall. A first insulating member, along the first direction, is at least partially disposed between the main body and the first wall; as well as The second insulating member is configured to fix the first insulating member to the main body portion.

2. The battery cell according to claim 1, characterized in that, The second insulating element is connected to the main body.

3. The battery cell according to claim 1 or 2, characterized in that, The second insulating element is connected to the first insulating element.

4. The battery cell according to claim 3, characterized in that, The first insulating member has a first end face and a side face, the first end face facing the first wall along the first direction, and the side face intersecting the first end face; The second insulating element connects the side surface and the main body.

5. The battery cell according to claim 4, characterized in that, The first insulating member includes at least two support portions, with two adjacent support portions spaced apart along a third direction, and the support portions are used to abut against the main body portion; The support portion includes a first surface and two second surfaces opposite each other along a second direction. The first surfaces of two adjacent support portions are arranged opposite each other along the third direction. The side surface includes the first surface and the second surface. The second insulating member is connected to at least one of the first surface and the second surface. The first direction, the second direction and the third direction are perpendicular to each other.

6. The battery cell according to claim 5, characterized in that, The first insulating member includes a connecting portion that connects two adjacent support portions, and along the first direction, a portion of the support portion protrudes from the surface of the connecting portion facing the main body portion.

7. The battery cell according to claim 1, characterized in that, The second insulating element is bonded to the main body and the first insulating element.

8. The battery cell according to claim 1, characterized in that, Along the first direction, a portion of the second insulating member is located between the first insulating member and the first wall; a portion of the second insulating member is located on at least one side of the first insulating member and the main body along the second direction and is connected to the main body, the second direction being perpendicular to the first direction.

9. The battery cell according to claim 8, characterized in that, The second insulating member includes a first fixing part and two second fixing parts spaced apart along the second 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.

10. The battery cell according to claim 8 or 9, characterized in that, In the same plane perpendicular to the first direction, the orthographic projections of the first through hole and the second insulating member are spaced apart.

11. The battery cell according to claim 8, characterized in that, The first insulating member is provided with an exhaust hole that extends through the first direction. In the same plane perpendicular to the first direction, at least a portion of the orthographic projection of the exhaust hole and the orthographic projection of the second insulating member are spaced apart.

12. The battery cell according to claim 8, characterized in that, The first wall is provided with a liquid injection hole, and in the same plane perpendicular to the first direction, the orthographic projection of the second insulating member and the orthographic projection of the liquid injection hole at least partially overlap.

13. The battery cell according to claim 8, characterized in that, The first insulating member is provided with a second through hole extending along the first direction, and the first conductive part passes through the second through hole; In the same plane perpendicular to the first direction, the orthographic projections of the second insulating element and the second through hole are spaced apart.

14. The battery cell according to claim 8, characterized in that, The portion of the second insulating member that overlaps with the main body along the second direction has a dimension L1 along the first direction, and the main body has a dimension L2 along the first direction. L1 ≥ 5 mm, and L1 / L2 ≤ 0.

5.

15. The battery cell according to claim 1, characterized in that, The battery cell includes a third insulating member, which covers the outside 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.

16. The battery cell according to claim 15, characterized in that, The first insulating member includes at least two support portions, with two adjacent support portions spaced apart along a third direction. The support portions are used to abut against the main body portion, and the third direction is perpendicular to the first direction. At least two of the support portions are thermally fused to the third insulating member.

17. The battery cell according to claim 16, characterized in that, The first insulating member includes a connecting portion that connects two adjacent support portions, and along the first direction, a portion of the support portion protrudes from the surface of the connecting portion facing the main body portion.

18. The battery cell according to claim 16 or 17, characterized in that, The battery cell includes at least two second insulating members, and the at least two second insulating members are respectively connected to at least two of the support portions.

19. The battery cell according to claim 18, characterized in that, The support portion includes a first surface and two second surfaces disposed opposite to each other along a second direction. The first surfaces of two adjacent support portions are disposed opposite to each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. At least two of the support portions include a first support portion and a second support portion, wherein only the first surface of the first support portion is connected to the third insulating member, and the second surface of the second support portion is connected to the third insulating member; Along the second direction, a portion of the second insulating member is disposed between the second surface and the third insulating member. The dimension of the second insulating member connected to the first support portion along the third direction is L31, and the dimension of the second insulating member connected to the second support portion along the third direction is L32, where L31 > L32.

20. The battery cell according to claim 18, characterized in that, The support portion includes a first surface and two second surfaces disposed opposite to each other along a second direction. The first surfaces of two adjacent support portions are disposed opposite to each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. At least two of the support portions include a first support portion and a second support portion, wherein only the first surface of the first support portion is connected to the third insulating member, and the second surface of the second support portion is connected to the third insulating member; The melting point of the second insulating member connected to the first support is T1, and the melting point of the second insulating member connected to the second support is T2, where T1 < T2.

21. The battery cell according to claim 18, characterized in that, Along the third direction, the size of the support portion is larger than the size of the second insulating member; The support portion includes a first surface and two second surfaces disposed opposite to each other along a second direction. The first surfaces of two adjacent support portions are disposed opposite to each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Along the second direction, a portion of the second insulating member is disposed between the second surface and the third insulating member. The third insulating member is connected to the first surface and the second surface. Along the third direction, the welded portion formed by the connection of the third insulating member and the second surface is further away from the first surface than the second insulating member.

22. The battery cell according to claim 18, characterized in that, The support portion includes a first surface and two second surfaces disposed opposite to each other along a second direction. The first surfaces of two adjacent support portions are disposed opposite to each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Along the second direction, a portion of the second insulating member is disposed between the second surface and the second insulating member, and the edge of the second insulating member near the first surface is flush with the first surface.

23. The battery cell according to claim 16, characterized in that, Along the second direction, at least a portion of the second insulating member is located between the support and the third insulating member. The first direction, the second direction, and the third direction are perpendicular to each other. The portion of the second insulating member that overlaps with the support along the second direction has a dimension of L3 along the third direction. The dimension of the support along the third direction is L4. L2 ≥ 5 mm, and L3 / L4 ≤ 0.

5.

24. The battery cell according to claim 1, characterized in that, The battery cell includes a cover, which is connected to the first wall and extends along the first wall toward the main body, covering the first through hole.

25. The battery cell according to claim 24, 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.

26. The battery cell according to claim 24 or 25, characterized in that, The cover is welded to the first wall and is used to connect to the busbar component.

27. The battery cell according to claim 1, characterized in that, The portion of the first conductive part located on the side of the first wall away from the main body is welded to the first wall.

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

29. 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 connected to the first wall.

30. 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.

31. The battery cell according to claim 30, characterized in that, The outer casing includes two second walls spaced apart along a second direction, the second direction being perpendicular to the first direction; The 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 second walls.

32. The battery cell according to claim 1, characterized in that, The outer casing includes a third wall, which is disposed on the side of the main body away from the first wall along the first direction; The battery cell includes electrode terminals disposed on the third wall; The electrode unit includes a second conductive part, which has the opposite polarity to the first conductive part. The second conductive part is led out from the main body and electrically connected to the electrode terminal.

33. The battery cell according to claim 32, characterized in that, The second conductive part includes a second electrode tab, which is connected to the main body part; The battery cell includes an adapter that connects the second tab and the electrode terminal.

34. The battery cell according to claim 32, 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.

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

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

37. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-36.

38. An electrical appliance, characterized in that, Includes the battery device according to claim 37, the battery device being used to provide electrical energy.

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