Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises an electrode unit, a shell and a first insulation piece. The electrode unit comprises a first conductive part and a main body part 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; a recess is arranged on the side of the first wall away from the main body part, the first wall comprises a first part and a second part corresponding to the recess along the first direction, at least part of the second part is closer to the main body part than the first part, the first conductive part is arranged through the first through hole, and part of the first conductive part is accommodated in the recess and electrically connected to the first wall. At least part of the first insulation piece is arranged between the main body part and the first part along the first direction; the orthographic projection of the second part and the orthographic projection of the first insulation piece at least partially overlap along a second direction. The application is beneficial to improving the space utilization rate of the inside of the shell and the outside of the shell, thereby improving the energy density of the battery monomer.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to PCT application No. PCT / CN2025 / 145281, filed on December 24, 2025, entitled “Battery Cells, Battery Devices and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0005] In the development of battery technology, improving the energy density of individual battery cells is a key research direction. Utility Model Content

[0006] This application provides a battery cell, a battery device, and an electrical appliance, which are beneficial for improving the energy density of the battery cell.

[0007] According to a first aspect of this application, a battery cell is provided, comprising an electrode unit, a housing, and a first insulating member. The electrode unit includes a main body portion and a first conductive portion extending from the main body portion. The housing includes a first wall, the main body portion is housed within the housing, the first wall is located on one side of the main body portion along a first direction, and the first wall has a first through hole; a recess is provided on the side of the first wall away from the main body portion, the first wall includes a first portion and a second portion, the second portion corresponding to the recess along the first direction, at least a portion of the second portion being closer to the main body portion than the first portion, the first conductive portion passing through the first through hole, and a portion of the first conductive portion being housed in the recess and 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 portion along the first direction; in the same plane perpendicular to a second direction, the orthographic projection of the second portion at least partially overlaps with the orthographic projection of the first insulating member, the second direction being perpendicular to the first direction.

[0008] In this embodiment, a portion of the first conductive part extends out of the outer casing through a first through-hole and is electrically connected to the first wall. This reduces the space occupied by the first conductive part inside the casing and eliminates the need for a traditional electrode terminal, thereby simplifying the structure of the battery cell and reducing assembly difficulty. The recess provides at least partial accommodating space for the portion of the first conductive part extending out of the first through-hole. The first conductive part and the first wall can share a portion of the space in the first direction, improving the space utilization rate of the outer casing. At least a portion of the second part is closer to the main body than the first part, which helps to increase the depth of the recess, thereby providing more accommodating space for the first conductive part and increasing the thickness of the second part, reducing the impact of the recess on the structural strength of the first wall. The second part at least partially overlaps with the first insulating member along the second direction, and the space occupied by the first insulating member can be used to accommodate at least a portion of the second part, which helps to improve the space utilization rate inside the casing. This application helps to improve the space utilization rate inside and outside the casing, thereby increasing the energy density of the battery cell.

[0009] In some embodiments, the first insulating member includes at least two support portions spaced apart along a second direction, the support portions serving to abut against the main body portion. Along the second direction, at least a portion of the second portion is located between two adjacent support portions. A gap space is formed between the two adjacent support portions, and a portion of the first conductive portion is located within this gap space, which can accommodate the first conductive portion, allowing the first conductive portion to pass through the first through-hole. Since at least a portion of the second portion is located within this gap space, the gap space accommodating the first conductive portion can be utilized to improve the space utilization rate inside the housing.

[0010] In some embodiments, the first insulating member has a second through hole that penetrates the first insulating member along a first direction. A first conductive portion passes through the second through hole, and at least a portion of the second part is accommodated in the second through hole. The portion of the second part accommodated in the second through hole shares the space in the first direction with the first insulating member, which helps to reduce the additional space occupied by the second part in the housing and improve the space utilization rate inside the housing.

[0011] In some embodiments, the first insulating member includes a connecting portion and at least two supporting portions, the at least two supporting portions being spaced apart along a second direction, the connecting portion connecting two adjacent supporting portions, and a portion of the supporting portion protruding from the surface of the connecting portion near the main body along a first direction; a second through hole penetrating the connecting portion along the first direction. The two supporting portions are connected by the connecting portion to form a whole, which facilitates assembly. The second through hole penetrating the connecting portion, and the second portion sharing at least a portion of the space along the first direction with the connecting portion, helps improve space utilization.

[0012] In some embodiments, the orthographic projection of the second portion lies within the orthographic projection of the second through hole in the same plane perpendicular to the first direction. The second through hole has a larger area, allowing the second portion to be inserted entirely into it, which helps reduce the possibility of interference between the second portion and the first insulating component and facilitates assembly.

[0013] In some embodiments, the first conductive part is connected to the second part, and the first through hole penetrates the second part along the first direction. This reduces the height difference in the first direction between the position where the first conductive part emerges from the first through hole and the position where the first conductive part connects to the first wall, reduces the phenomenon of the first conductive part arching within the recess, reduces the space occupied by the first conductive part in the first direction within the recess, and also reduces the degree of bending of the first conductive part, lowering the risk of cracking.

[0014] In some embodiments, the second portion includes a first sub-part and a second sub-part. Along the first direction, the first surface of the first sub-part, which is away from the main body, is closer to the main body than the second surface of the second sub-part, which is away from the main body. In the same plane perpendicular to the first direction, the orthographic projection of the portion of the first conductive part housed in the recess at least partially overlaps with the orthographic projection of the first sub-part, and is spaced apart from the orthographic projection of the second sub-part. The portion of the recess corresponding to the first sub-part is more recessed, providing more accommodating space for the first conductive part in the first direction, thus reducing the additional space occupied by the first conductive part. Along the first direction, the portion of the first conductive part extending out of the first through-hole and the second sub-part do not overlap, and the portion of the first conductive part extending out of the first through-hole and the second sub-part can share part of the space in the first direction, which is beneficial for improving space utilization.

[0015] In some embodiments, the first sub-part is closer to the main body than the first portion, and in the same plane perpendicular to the second direction, the orthographic projection of the first sub-part at least partially overlaps with the orthographic projection of the first insulating member. The fact that the first sub-part is closer to the main body than the first portion facilitates increasing the thickness of the first sub-part and reduces the impact of a greater recess in the first sub-part on the structural strength of the first wall. The first sub-part and the first insulating member can share a portion of the space in the first direction, fully utilizing the space occupied by the first insulating member to accommodate at least a portion of the first sub-part, thereby improving the space utilization rate within the housing.

[0016] In some embodiments, the second sub-part is closer to the main body than the first part, and in the same plane perpendicular to the second direction, the orthographic projection of the second sub-part at least partially overlaps with the orthographic projection of the first insulating member. The second sub-part and the first insulating member can share a portion of the space in the first direction, making full use of the space occupied by the first insulating member to accommodate at least a portion of the second sub-part, thereby improving the space utilization rate within the housing.

[0017] In some embodiments, along a first direction, a portion of the first conductive portion is located on the side of the second sub-portion closer to the main body. The first portion includes a fourth surface facing the main body. Along the direction from the first wall towards the main body, both the first and second sub-portions extend beyond the fourth surface, with the dimension of the second sub-portion extending beyond the fourth surface being smaller than the dimension of the first sub-portion extending beyond the fourth surface. A larger dimension of the first sub-portion extending beyond the fourth surface is advantageous for increasing the thickness of the first sub-portion and reducing the impact of a greater degree of indentation in the first sub-portion on the structural strength of the first wall. A smaller dimension of the second sub-portion extending beyond the fourth surface is advantageous for reducing the possibility of interference between the second sub-portion and the first conductive portion.

[0018] In some embodiments, the first insulating member includes a connecting portion and at least two support portions spaced apart along a second direction. The connecting portion connects two adjacent support portions. Along the first direction, a portion of the support portion protrudes from the surface of the connecting portion facing the main body. The connecting portion has a second through hole extending along the first direction, through which a first conductive portion passes. A first sub-portion is partially accommodated in the second through hole. Along the direction from the first wall towards the main body, a portion of the first sub-portion extends beyond the second through hole. This can increase the spatial depth of the portion of the recess corresponding to the first sub-portion, providing more accommodating space for the first conductive portion. Since the second through hole extends through the connecting portion, the portion of the first sub-portion extending beyond the second through hole can be located within the space on the side of the connecting portion facing the main body, making it less likely to contact the main body.

[0019] 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 portion, 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 accommodated in a recess. In the same plane perpendicular to the first direction, the orthographic projection of the portion of the first adapter portion located on the side of the first wall near the main body portion is spaced apart from the orthographic projection of the first sub-part. Passing the first adapter portion through the first through hole helps reduce assembly difficulty. The portion of the first adapter portion located on the side of the first wall near the main body portion is less likely to interfere with the first sub-part, making it easier for the first adapter portion to pass through the first through hole.

[0020] In some embodiments, the first through hole is formed by a first sub-part and a second sub-part. This reduces the height difference in the first direction between the position where the first conductive part protrudes from the first through hole and the position where the first conductive part is welded to the first wall, reduces the phenomenon of the first conductive part arching in the recess, reduces the space occupied by the first conductive part in the first direction in the recess, and also reduces the degree of bending of the first conductive part, thereby reducing the risk of cracking of the first conductive part.

[0021] In some embodiments, the second portion includes a third sub-portion connected to the first portion and the second sub-portion. Along a first direction, the third surface of the third sub-portion, facing away from the main body, is further away from the main body than the second surface. The battery cell includes a cover attached to the third surface, covering a first through-hole along the first direction. The cover prevents external particles, water, and other impurities from entering the casing through the first through-hole, causing contamination or a short circuit risk. At least a portion of the cover can be accommodated within a recess, and the cover shares a portion of the space along the first direction with the first portion, which improves space utilization and increases the energy density of the battery cell.

[0022] In some embodiments, the battery cell includes a second insulating member configured to fix the first insulating member to the main body. The second insulating member helps to limit the displacement and movement of the first insulating member within the housing, improving the stability of the first insulating member, thereby improving the insulation effect and increasing the reliability of the battery cell. Furthermore, the second insulating member also helps to improve the insulation effect between the main body and the housing.

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

[0024] In some embodiments, the second insulating member includes a first fixing portion and two second fixing portions spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Along the first direction, at least a portion of the first fixing portion is located between the first insulating member and the first wall. The first fixing portion connects to the two second fixing portions, which are respectively connected to two opposite surfaces of the main body along the third direction. The second insulating member can provide a balanced binding effect on the first insulating member, reducing the possibility of the first insulating member shifting or warping along either side of the third portion, and improving the stability of the first insulating member relative to the main body.

[0025] In some embodiments, the orthographic projections of the first fixing portion and the first through hole are spaced apart in the same plane perpendicular to the first direction. This helps to reduce interference between the first fixing portion and the first conductive portion, and facilitates the smooth passage of a portion of the first conductive portion through the first wall.

[0026] In some embodiments, the battery cell includes a third insulating member, which covers at least a portion of the outer side of the main body and is thermally fused with a first insulating member to form a welded portion. The first insulating member has a first end face and a side face, the first end face facing a first wall along a first direction, and the side face intersecting the first end face. At least a portion of the second insulating member is located between the side face and the third insulating member, and the welded portion is spaced apart from the second insulating member. This reduces the adverse effects of heat generated during the thermal fusion of the third and first insulating members on the second insulating member, lowers the risk of partial melting of the second insulating member affecting its structural strength, and also reduces the risk of warping caused by partial melting of the second insulating member damaging the third insulating member or causing the third insulating member to warp.

[0027] In some embodiments, the portion of the first conductive part housed in the recess is welded to the second part to form a welded portion. Direct welding of the first conductive part to the first wall simplifies the structure and improves the connection strength between the first conductive part and the first wall. Welding the first conductive part and the first wall on the outside reduces the probability of welding particles falling into the housing, thus reducing the risk of short circuits and improving reliability.

[0028] In some embodiments, the battery cell includes a fourth insulating member disposed between the second portion and the main body portion along a first direction. In the same plane perpendicular to the first direction, the orthographic projection of the welded portion and the orthographic projection of the fourth insulating member at least partially overlap. The fourth insulating member can reduce the heat transferred to the main body portion during welding of the first conductive portion and the second portion, thereby reducing the adverse effects of the welding operation on the main body portion.

[0029] In some embodiments, the second portion includes a first sub-part and a second sub-part. Along a first direction, the first sub-part is closer to the main body than the second sub-part. A first conductive part is welded to the first sub-part to form a welded part. At least a portion of a fourth insulating member is disposed between the first sub-part and the main body. The fourth insulating member can insulate and isolate the first sub-part and the main body, reducing the risk of short circuit caused by the overlap of the first sub-part and the main body.

[0030] In some embodiments, the battery cell includes a cover attached to a first wall and covering a first through-hole along a first direction. The cover prevents external particles, water, and other impurities from entering the casing through the first through-hole, causing contamination or a short circuit risk.

[0031] In some embodiments, at least a portion of the cover is accommodated in a recess along a first direction. The recess provides at least partial accommodating space for the cover, which helps reduce the additional space occupied by the cover in the first direction, improves space utilization in the first direction, and thereby increases the energy density of the battery cell.

[0032] In some embodiments, the cover is welded to the first wall and used for connection with the busbar component; a portion of the first conductive part receptacle in the recess is welded to the second portion to form a welded portion; the battery cell includes a separator, at least a portion of which is disposed between the cover and the welded portion along a first direction. The separator can reduce the heat transferred to the welded portion during welding of the cover and the busbar component, reduce the adverse effects of welding operations on the welded portion, and reduce the risk of cracking or breakage of the welded portion leading to connection failure of the first conductive part and the first wall, thereby improving the reliability of the battery cell.

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

[0034] In some embodiments, the housing includes two second walls disposed along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other; the first conductive part includes a first tab, and the first tab includes multiple first tab layers, with the first tab layers of the two electrode units respectively converging towards the two second walls. This extends the overall length of the first tab, giving it a certain redundancy for stretching deformation, which helps alleviate the pulling effect on the first tab when the first conductive part passes through the first through hole, reduces the tensile stress on the first tab, and lowers the risk of the first tab breaking.

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

[0036] In some embodiments, the second part includes a first sub-part and a second sub-part. Along a first direction, the first surface of the first sub-part facing away from the main body is closer to the main body than the second surface of the second sub-part facing away from the main body. Along a third direction, at least a portion of the first sub-part is located between two first through holes, and both first conductive parts are welded to the portion of the first sub-part located between the two first through holes. The first sub-part is more recessed than the second sub-part, providing more space for the two first conductive parts, thereby improving space utilization. The second part only requires one more recessed first sub-part, which helps reduce molding difficulty.

[0037] In some embodiments, the orthographic projections of two first conductive parts are spaced apart in the same plane perpendicular to the first direction. This prevents the two first conductive parts from overlapping in the first direction, allowing them to share space and thus improving space utilization. It also helps reduce interference between the two first conductive parts, lowering the risk of edge warping, bending deformation, and other factors affecting welding strength.

[0038] In some embodiments, the first conductive portion includes a first tab and a first adapter portion. The first tab is connected to the main body, 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 accommodated in a recess and connected to the first wall. This 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.

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

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

[0041] In some embodiments, the first conductive portion includes a first tab, which passes through a first through hole, and a portion of the first tab is accommodated in a recess and connected to a first wall. Two transition layers are stacked and welded to the first wall, which improves welding strength and stability.

[0042] In some embodiments, the housing includes a third wall, and along a first direction, the main body is disposed between the first wall and the third wall; the battery cell includes an electrode terminal disposed on the third wall, and the electrode unit includes a second conductive portion extending from the main body and electrically connected to the electrode terminal. 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 the space occupied by both the first and second conductive portions in the first direction on the energy density of the battery cell.

[0043] In some embodiments, the second conductive portion includes a second tab connected to the main body portion; the battery cell includes two second conductive portions, with the second tabs of the two second conductive portions being separately disposed along a third direction, and the first direction, the second direction, and the third direction being perpendicular to each other. This 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.

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

[0045] In some embodiments, the housing includes two second walls disposed along a third direction, with the first, second, and third directions perpendicular to each other; the battery cell includes a third insulating member, a fifth insulating member, and a sixth insulating member. Along the first direction, at least a portion of the fifth insulating member is disposed between the main body and the third wall; the third insulating member covers the outside of at least a portion of the main body and is connected to the fifth insulating member; along the third direction, a portion of the third insulating member and at least a portion of the sixth insulating member are stacked between the second wall and the second conductive portion. This allows for a double-layer insulation barrier to be formed between the second wall and the second conductive portion, which helps reduce the risk of a short circuit caused by the second conductive portion and the second wall overlapping due to warping, wrinkling, or damage to either the third or sixth insulating member, thereby improving the reliability of the battery cell.

[0046] In some embodiments, along the second direction, the size of the sixth insulating member is greater than or equal to the size of the second conductive portion, and both ends of the second conductive portion along the second direction do not extend beyond the sixth insulating member. The sixth insulating member can prevent the second conductive portion from overlapping with the second wall in any region of the two directions, thereby improving the insulation and isolation effect of the sixth insulating member on the second conductive portion and the second wall.

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

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

[0049] In some embodiments, the housing includes a housing and an end cap, the housing having an opening on one side along a first direction, the end cap being connected to the housing and covering the opening; the third wall is the end cap, and the housing is integrally formed and includes the first wall.

[0050] In some embodiments, the housing includes a housing and two end caps, the housing having openings on both sides along a first direction, the two end caps being connected to the housing and respectively covering the two openings; a first wall is one of the end caps, and a third wall is the other end cap.

[0051] According to a second aspect of this application, this application also provides a battery device comprising a battery cell provided in any of the embodiments.

[0052] According to a third aspect of this application, this application also provides an electrical device that includes a battery device provided in any embodiment, the battery device being used to provide electrical energy. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

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

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

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

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

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

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

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

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

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

[0067] Figure 14 This is a partial cross-sectional view of a battery cell provided in the fifth embodiment of this application.

[0068] Figure 15 This is an exploded view of a battery cell provided in the sixth embodiment of this application.

[0069] Figure 16 yes Figure 15 The cross-sectional view of the battery cell shown.

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

[0071] The attached figures are labeled as follows:

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

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

[0074] 6. Battery cell, 10. Electrode unit, 11. Main body, 12. First conductive part, 121. First tab, 122. First adapter, 1221. Adapter layer, 13. Second conductive part, 131. Second tab, 20. Outer shell, 21. Housing, 211. Housing opening, 22. End cap, 23. First wall, 231. First through hole, 232. Recess, 233. First part, 233a. Fourth surface, 234. Second part, 2341. First sub-part, 2341a. First surface, 2342. Second sub-part, 2342a. Second surface, 2343. Third sub-part, 2343a. Third surface, 235. Third part, 24. Second 25. Third wall, 26. Fourth wall, 30. Cover, 40. Isolator, 51. First insulating member, 511. Second through hole, 512. Support, 512a. Fifth surface, 512b. Sixth surface, 513. Connecting part, 51a. First end face, 51b. Side side, 52. Second insulating member, 521. First fixing part, 522. Second fixing part, 53. Third insulating member, 54. Fourth insulating member, 55. Fifth insulating member, 56. Sixth insulating member, 561. First insulating part, 562. Second insulating part, 60. Electrode terminal, 80. Adapter, N. Welding part, W. Welding part, X. First direction, Y. Second direction, Z. Third direction. Detailed Implementation

[0075] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0076] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0077] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0078] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "adhesion" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0079] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0080] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

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

[0082] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0083] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0084] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but this application does not limit it to this type.

[0085] A typical battery cell includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is housed within the housing, and the electrode terminals are located within the housing. The housing encapsulates the electrode assembly and electrolyte components. The electrode assembly includes tabs, which are electrically connected to the electrode terminals via adapters or directly to the electrode terminals. The electrode terminals are used to electrically connect the electrode assembly to external circuitry within the battery cell to enable charging or discharging of the battery cell.

[0086] The electrode assembly includes a positive electrode, a negative electrode, and an isolation structure. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The isolation structure, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0087] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0088] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

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

[0090] In some embodiments, the isolation structure is an isolation membrane. This application does not impose any particular limitation on the type of isolation membrane; any known porous isolation membrane with good chemical and mechanical stability can be selected.

[0091] In some embodiments, the isolation structure is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

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

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

[0094] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

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

[0096] A battery device typically includes a housing for encapsulating one or more individual battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0097] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties. The battery cell assembly can be housed within a housing by fixing the battery module within the housing. As an example, the housing can include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, creating a closed space inside the housing to house the battery cell assembly.

[0098] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

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

[0100] Tabs are typically connected directly to the electrode terminals, or indirectly to them via adapters. The tabs and adapters are housed within the casing, and all of them occupy internal space, affecting the energy density of the individual battery cells.

[0101] To reduce the space occupied by mechanical components inside 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 inside the casing but also eliminates the need for electrode terminals, simplifying the structure of the battery cell. However, the tab or adapter extending beyond the casing will occupy space outside the casing.

[0102] In view of this, the present application provides a technical solution by providing a recess on the outer side of the first wall, so that at least part of the first wall corresponding to the recess protrudes inward and shares space with the first insulating member inside the shell. On the one hand, the degree of recess can be increased, providing more space for the tabs or adapters that protrude from the first wall and reducing the space occupied outside the shell. On the other hand, it can also reduce the space occupied inside the shell by the part of the first wall corresponding to the recess, which is conducive to improving the space utilization rate inside and outside the shell, thereby increasing the energy density of the battery cell.

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

[0104] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

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

[0106] Figure 1 This is a structural schematic diagram of a vehicle provided in some embodiments of this application. (Refer to...) Figure 1 Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0107] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

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

[0109] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0110] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0111] In the battery device 2, there can be multiple battery cells 6, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel configurations. Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 6 is housed within the housing 5. Alternatively, the battery device 2 can also consist of multiple battery cells 6 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 5. The battery device 2 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 6.

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

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

[0114] The outer casing 20 is used to encapsulate the electrode unit 10 and electrolyte components. The outer casing 20 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

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

[0116] The outer casing 20 can be made of various materials, such as metal or plastic. Optionally, the outer casing 20 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. For example, the outer casing 20 can be a steel casing, aluminum casing, plastic casing (such as polypropylene), composite metal casing (such as copper-aluminum composite casing), or aluminum-plastic film, etc.

[0117] As an example, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having a housing opening and the end cap 22 for closing the housing opening.

[0118] The housing 21 is a component used to fit the end cap 22 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate a part of the electrode unit 10, the electrolyte, and other components.

[0119] The housing 21 and the end cap 22 can be separate components. For example, a housing opening 211 can be provided on the housing 21, and the end cap 22 can be used to cover the housing opening 211 to form an internal cavity for the battery cell 6.

[0120] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21.

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

[0122] The housing 21 may be open at one end or open at both ends. For example, the housing 21 is open on one side, and the end cap 22 is configured as one housing opening 211 that covers the housing 21. As another example, the housing 21 may also be open on both sides, and two end caps 22 are configured, with the two end caps 22 respectively covering the two housing openings 211 of the housing 21.

[0123] Figure 5 yes Figure 3 The cross-sectional view of the battery cell shown. Figure 6 yes Figure 5 An enlarged schematic diagram of region A in the middle. Figure 7 yes Figure 6 An enlarged schematic diagram of region C in the middle. Figure 8 This is a partial cross-sectional view of a battery cell provided in the second embodiment of this application. Figure 9 This is a partial structural diagram of a battery cell provided in the third embodiment of this application. Figure 10 yes Figure 9 An enlarged schematic diagram of region D in the middle. Figure 11 yes Figure 9 The diagram shows the partial structure and the structure after the third insulating component is assembled. Figure 12 yes Figure 5 An enlarged schematic diagram of region B in the middle. Figure 13 This is a partial cross-sectional view of a battery cell provided in the fourth embodiment of this application. Figure 14 This is a partial cross-sectional view of a battery cell provided in the fifth embodiment of this application. Figure 15 This is an exploded view of a single battery cell provided in the sixth embodiment of this application. Figure 16 yes Figure 15 The cross-sectional view of the battery cell shown. Figure 17 yes Figure 16 A magnified view of region E in the middle.

[0124] Reference Figures 3 to 17 The battery cell 6 provided in this embodiment includes an electrode unit 10, a housing 20, and a first insulating member 51. The electrode unit 10 includes a main body 11 and a first conductive portion 12 extending from the main body 11, the main body 11 being housed within the housing 20. The housing 20 includes a first wall 23 located on one side of the main body 11 along a first direction X, and the first wall 23 has a first through hole 231. A recess 232 is provided on the side of the first wall 23 away from the main body 11. The first wall 23 includes a first portion 233 and a second portion 234, the second portion 234 corresponding to the recess 232 along the first direction X. At least a portion of the second portion 234 is closer to the main body 11 than the first portion 233. The first conductive portion 12 passes through the first through hole 231, and a portion of the first conductive portion 12 is housed in the recess 232 and electrically connected to the first wall 23. At least a portion of the first insulating member 51 is disposed between the main body 11 and the first portion 233 along the first direction X. In the same plane perpendicular to the second direction Y, the orthographic projection of the second part 234 at least partially overlaps with the orthographic projection of the first insulating member 51, and the second direction Y is perpendicular to the first direction X.

[0125] The first wall 23 can be one of the walls of the housing 21, or it can be an end cap 22. Optionally, in Figure 4 In the embodiment shown, the first wall 23 is an end cap 22.

[0126] In one example, refer to Figure 6 The first part 233 is directly connected to the second part 234. In another example, refer to... Figure 8 The first wall 23 also includes a third part 235, which connects the first part 233 and the second part 234. The third part 235 is bent relative to the first part 233 and the second part 234.

[0127] In one example, refer to Figure 8 The second part, 234, is closer to the main body 11 than the first part, 233. In another example, refer to... Figure 6 Only a portion of the second part 234 is closer to the main body 11 than the first part 233. Along the direction from the first wall 23 to the main body 11, a portion of the second part 234 protrudes from the surface of the first part 233 near the main body 11.

[0128] 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.

[0129] In one example, the first through hole 231 extends through the second portion 234. In another example, the first through hole 231 extends through either the first portion 233 or the third portion 235.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] The first conductive portion 12 is directly connected to the first wall 23, or the first conductive portion 12 is indirectly connected to the first wall 23 through an intermediate component to establish an electrical connection with the first wall 23 through the intermediate component. Optionally, the portion of the first conductive portion 12 housed in the recess 232 is connected to the second portion 234.

[0137] The portion of the first conductive part 12 extending to the outside of the first wall 23 can be entirely accommodated in the recess 232, or it can be partially accommodated in the recess 232.

[0138] Optionally, the portion of the first conductive part 12 housed in the recess 232 is welded to the first wall 23, which 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 on the outside reduces the probability of welding particles falling into the housing 20, thus reducing the risk of short circuits and improving reliability.

[0139] The portion of the first conductive part 12 that extends from the first through hole 231 is bent toward the surface of the first wall 23 away from the main body 11, so as to be welded to the first wall 23. The welding method of the first conductive part 12 and the first wall 23 includes, but is not limited to, laser, ultrasonic, etc. During welding, a portion of the first conductive part 12 and a portion of the first wall 23 are heated and melted together to form a welded part W.

[0140] The first insulating member 51 is used to insulate and isolate the main body 11 and the first part 233. Optionally, the first insulating member 51 is a plastic part.

[0141] The first insulating member 51 may be connected to the first wall 23 by bonding, heat fusion or other means; the first insulating member 51 may also only contact or abut against the first wall 23; the first insulating member 51 may also be spaced apart from the first wall 23, for example, other components are provided between the first insulating member 51 and the first wall 23.

[0142] The first direction X is the thickness direction of the first wall 23, and the second direction Y can be either the length direction or the width direction of the first wall 23. Optionally, in Figure 4 In the embodiment shown, the second direction Y is the length direction of the first wall 23.

[0143] In the battery cell 6 provided in this embodiment, a portion of the first conductive part 12 extends out of the outer casing 20 through the first through hole 231 and is electrically connected to the first wall 23. This reduces the space occupied by the first conductive part 12 inside the outer casing 20 and eliminates the need for a traditional electrode terminal, thereby simplifying the structure of the battery cell 6 and reducing assembly difficulty. The recess 232 provides at least partial accommodating space for the portion of the first conductive part 12 extending out of the first through hole 231. The first conductive part 12 and the first wall 23 can share a portion of the space in the first direction X, improving the space utilization rate outside the outer casing 20 and reducing the additional space occupied by the first conductive part 12 on the outside of the outer casing 20. At least a portion of the second part 234 is closer to the main body 11 than the first part 233, which helps to increase the depth of the recess 232, thereby providing more accommodating space for the first conductive part 12. It also increases the thickness of the second part 234, reducing the impact of the recess 232 on the structural strength of the first wall 23. The second part 234 at least partially overlaps with the first insulating member 51 along the second direction Y, and at least a portion of the second part 234 can be accommodated in the space occupied by the first insulating member 51, which is beneficial to improving the space utilization rate inside the casing 20. This application is beneficial to simultaneously improving the space utilization rate inside and outside the casing 20, thereby increasing the energy density of the battery cell 6.

[0144] In some embodiments, refer to Figure 4 The first insulating member 51 includes at least two support portions 512 spaced apart along the second direction Y, the support portions 512 being used to abut against the main body portion 11. Along the second direction Y, at least a portion of the second portion 234 is located between two adjacent support portions 512.

[0145] Two adjacent support portions 512 can be connected together through other parts of the first insulating member 51, or the two adjacent support portions 512 can be two separate and independent parts.

[0146] The number of support parts 512 can be two, and the two support parts 512 are respectively close to the two shell walls of the outer shell 20 that are arranged opposite each other along the second direction Y.

[0147] A space is formed between two adjacent support portions 512. A portion of the first conductive portion 12 is located within this space, which allows the first conductive portion 12 to pass through the first through hole 231. At least a portion of the second portion 234 is located within this space, and the space that allows the first conductive portion 12 to pass through can accommodate at least a portion of the second portion 234, thereby improving the space utilization rate inside the housing 20.

[0148] In some embodiments, refer to Figures 4 to 7The first insulating member 51 is provided with a second through hole 511, which penetrates the first insulating member 51 along the first direction X. The first conductive part 12 passes through the second through hole 511, and at least a portion of the second part 234 is accommodated in the second through hole 511.

[0149] A portion of the first conductive part 12 passes through the second through hole 511 and the first through hole 231 in sequence and extends to the outer side of the first wall 23 away from the main body 11. The second through hole 511 provides clearance for the first conductive part 12.

[0150] Optionally, the first through hole 231 penetrates the first wall 23 along the first direction X, and the second through hole 511 and the first through hole 231 are arranged opposite to each other along the first direction X. This helps to reduce the bending of the first conductive part 12 and facilitates the first conductive part 12 to pass through the second through hole 511 and the first through hole 231 in sequence.

[0151] In the same plane perpendicular to the first direction X, the orthographic projection of the first through hole 231 is located within the orthographic projection of the second through hole 511, which helps to reduce the obstruction of the first insulating member 51 to the first conductive part 12 and facilitates the smooth passage of the first conductive part 12 through the first wall 23.

[0152] The second part 234 can be entirely accommodated within the second through hole 511, or it can be partially accommodated within the second through hole 511.

[0153] Along the direction from the first wall 23 to the main body 11, the second part 234 does not extend beyond the second through hole 511, or it may partially extend out of the second through hole 511.

[0154] The portion of the second part 234 housed within the second through hole 511 shares the space in the first direction X with the first insulating member 51, which helps to reduce the extra space occupied by the second part 234 within the housing 20 and improve the space utilization rate inside the housing 20.

[0155] In some embodiments, refer to Figure 4 The first insulating member 51 includes a connecting portion 513 and at least two supporting portions 512. The at least two supporting portions 512 are spaced apart along the second direction Y, and the connecting portion 513 connects two adjacent supporting portions 512. Along the first direction X, a portion of the supporting portion 512 protrudes from the surface of the connecting portion 513 near the main body portion 11. A second through hole 511 penetrates the connecting portion 513 along the first direction X.

[0156] Optionally, the connecting part 513 and the supporting part 512 are integrally formed.

[0157] Optionally, the support portion 512 is in contact with the main body portion 11, which helps to reduce the shaking of the main body portion 11.

[0158] The two support portions 512 are connected by the connecting portion 513 to form a whole, which is beneficial for assembly. The support portion 512 is closer to the main body portion 11 than the connecting portion 513, and an accommodating space can be formed on the side of the connecting portion 513 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 51 share part of the space in the first direction X, which is beneficial for improving space utilization.

[0159] The second through hole 511 penetrates the connecting part 513. The second part 234 and the connecting part 513 share at least part of the space in the first direction X, which is beneficial to improving space utilization.

[0160] Along the first direction X, the surfaces of the support portion 512 and the connecting portion 513 facing the first wall 23 are flush. The connecting portion 513, the support portion 512, and the second portion 234 can share part of the space in the first direction X, thereby improving space utilization.

[0161] In some embodiments, refer to Figure 5 and Figure 6 In the same plane perpendicular to the first direction X, the orthographic projection of the second part 234 lies within the orthographic projection of the second through hole 511. The second through hole 511 has a larger area, and the second part 234 can be inserted entirely into the second through hole 511, which helps to reduce the possibility of interference between the second part 234 and the first insulating member 51 and facilitates assembly.

[0162] In some embodiments, refer to Figure 5 and Figure 6 The first conductive part 12 is connected to the second part 234, and the first through hole 231 penetrates the second part 234 along the first direction X. In this way, the height difference in the first direction X between the position where the first conductive part 12 exits from the first through hole 231 and the position where the first conductive part 12 connects to the first wall 23 can be reduced, the phenomenon of the first conductive part 12 arching in the recess 232 can be reduced, the space occupied by the first conductive part 12 in the first direction X in the recess 232 can be reduced, and the degree of bending of the first conductive part 12 can be reduced, thus reducing the risk of cracking of the first conductive part 12.

[0163] In some embodiments, refer to Figure 6 and Figure 7 The second part 234 includes a first sub-part 2341 and a second sub-part 2342. Along the first direction X, the first surface 2341 of the first sub-part 2341 facing away from the main body 11 is closer to the main body 11 than the second surface 2342 of the second sub-part 2342 facing away from the main body 11. In the same plane perpendicular to the first direction X, the orthographic projection of the portion of the first conductive part 12 housed in the recess 232 at least partially overlaps with the orthographic projection of the first sub-part 2341, and is spaced apart from the orthographic projection of the second sub-part 2342.

[0164] In one example, along the first direction X, the surface of the first sub-part 2341 facing the main body 11 is closer to the main body 11 than the surface of the second sub-part 2342 facing the main body 11. In another example, along the first direction X, the surface of the first sub-part 2341 facing the main body 11 is flush with the surface of the second sub-part 2342 facing the main body 11.

[0165] Along the first direction X, the thickness of the first sub-part 2341 and the thickness of the second sub-part 2342 can be the same or different.

[0166] In one example, the second sub-part 2342 is connected to the first part 233. In another example, the second sub-part 2342 and the first part 233 are connected by other parts of the first wall 23.

[0167] In one example, there are two second sub-parts 2342, located on either side of the first sub-part 2341 along the second direction Y. In another example, the second sub-parts 2342 surround the outer periphery of the first sub-part 2341.

[0168] Compared to the portion of the recess 232 corresponding to the second sub-part 2342, the portion of the recess 232 corresponding to the first sub-part 2341 is more recessed, which can provide more accommodating space for the first conductive part 12 in the first direction X, thereby reducing the additional space occupied by the first conductive part 12.

[0169] The second part 234 is arranged in a stepped shape. During the formation of the recess 232, the second sub-part 2342 with a shallower recess is formed first by stamping, cutting or other means, and then the first sub-part 2341 with a deeper recess is formed by stamping, cutting or other means. This helps to reduce the forming difficulty of the recess 232 and reduce the risk of breakage during the forming of the first wall 23.

[0170] Along the first direction X, the portion of the first conductive part 12 extending out of the first through hole 231 and the second sub-part 2342 do not overlap. The portion of the first conductive part 12 extending out of the first through hole 231 and the second sub-part 2342 can share part of the space in the first direction X, which is beneficial to improving space utilization.

[0171] In some embodiments, refer to Figure 6 The first sub-part 2341 is closer to the main body 11 than the first part 233. In the same plane perpendicular to the second direction Y, the orthographic projection of the first sub-part 2341 at least partially overlaps with the orthographic projection of the first insulating member 51.

[0172] Optionally, in the second direction Y, at least a portion of the first sub-part 2341 is located between two adjacent support parts 512.

[0173] Optionally, at least a portion of the first sub-part 2341 is accommodated in the second through-hole 511.

[0174] The first sub-part 2341 is closer to the main body 11 than the first part 233, which is beneficial for increasing the thickness of the first sub-part 2341 and reducing the impact of the greater recess of the first sub-part 2341 on the structural strength of the first wall 23. The first sub-part 2341 and the first insulating member 51 can share part of the space in the first direction X, making full use of the space occupied by the first insulating member 51 to accommodate at least a part of the first sub-part 2341, thereby improving the space utilization rate within the outer casing 20.

[0175] In some embodiments, refer to Figure 6 The second sub-part 2342 is closer to the main body 11 than the first part 233. In the same plane perpendicular to the second direction Y, the orthographic projection of the second sub-part 2342 at least partially overlaps with the orthographic projection of the first insulating member 51.

[0176] Optionally, in the second direction Y, at least a portion of the second sub-part 2342 is located between two adjacent support parts 512.

[0177] Optionally, at least a portion of the second sub-part 2342 is accommodated in the second through-hole 511.

[0178] The second sub-part 2342 is closer to the main body 11 than the first part 233, which helps to increase the thickness of the second sub-part 2342 and reduce the impact of the recess 232 on the structural strength of the first wall 23. The second sub-part 2342 and the first insulating member 51 can share part of the space in the first direction X, making full use of the space occupied by the first insulating member 51 to accommodate at least a part of the second sub-part 2342, thereby improving the space utilization rate within the housing 20.

[0179] In some embodiments, refer to Figure 6 and Figure 7 Along the first direction X, a portion of the first conductive portion 12 is located on the side of the second sub-portion 2342 closer to the main body portion 11. The first portion 233 includes a fourth surface 233a facing the main body portion 11. Along the direction from the first wall 23 towards the main body portion 11, both the first sub-portion 2341 and the second sub-portion 2342 extend beyond the fourth surface 233a, with the dimension of the second sub-portion 2342 extending beyond the fourth surface 233a being smaller than the dimension of the first sub-portion 2341 extending beyond the fourth surface 233a. In other words, along the first direction X, the surface of the first sub-portion 2341 near the main body portion 11 is closer to the main body portion 11 than the surface of the second sub-portion 2342 near the main body portion 11.

[0180] The larger dimension of the first sub-part 2341 extending beyond the fourth surface 233a is beneficial for increasing the thickness of the first sub-part 2341 and reducing the impact of a greater degree of indentation in the first sub-part 2341 on the structural strength of the first wall 23. The smaller dimension of the second sub-part 2342 extending beyond the fourth surface 233a is beneficial for reducing the possibility of interference between the second sub-part 2342 and the first conductive part 12.

[0181] In some embodiments, refer to Figure 6 and Figure 7 The first insulating member 51 includes a connecting portion 513 and at least two support portions 512 spaced apart along the second direction Y. The connecting portion 513 connects two adjacent support portions 512. Along the first direction X, a portion of the support portion 512 protrudes from the surface of the connecting portion 513 near the main body portion 11. The connecting portion 513 has a second through hole 511 extending along the first direction X, and the first conductive portion 12 passes through the second through hole 511. A first sub-portion 2341 is partially accommodated in the second through hole 511, and a portion of the first sub-portion 2341 extends beyond the second through hole 511 along the direction from the first wall 23 toward the main body portion 11.

[0182] A portion of the first sub-part 2341 extends beyond the second through-hole 511, increasing the spatial depth of the portion of the recess 232 corresponding to the first sub-part 2341 and providing more accommodating space for the first conductive part 12. The second through-hole 511 penetrates the connecting part 513, and the portion of the first sub-part 2341 extending beyond the second through-hole 511 can be located within the space of the connecting part 513 facing the main body 11, making it less likely to come into contact with the main body 11.

[0183] In some embodiments, refer to Figure 6 The first conductive portion 12 includes a first tab 121 and a first adapter portion 122. The first tab 121 is connected to the main body portion 11, and the first adapter portion 122 is soldered to the first tab 121. The first adapter portion 122 passes through the first through hole 231, and a portion of the first adapter portion 122 is accommodated in the recess 232. In the same plane perpendicular to the first direction X, the orthographic projection of the portion of the first adapter portion 122 located on the side of the first wall 23 near the main body portion 11 is spaced apart from the orthographic projection of the first sub-portion 2341.

[0184] In one example, the first tab 121 is entirely located on the side of the first wall 23 near the main body 11. In another example, a portion of the first tab 121 is located on the side of the first wall 23 near the main body 11, and another portion of the first tab 121 can be accommodated in the first through hole 231.

[0185] A portion of the first adapter 122 is located on the side of the first wall 23 near the main body 11 and is welded to the first tab 121. The orthographic projection of this portion of the first adapter 122 and the orthographic projection of the first sub-part 2341 are spaced apart. This portion of the first adapter 122 is less likely to interfere with the first sub-part 2341, making it easier for the first adapter 122 to pass through the first through hole 231.

[0186] Optionally, a portion of the first adapter 122 extends through the first through hole 231 and is welded to the first sub-part 2341. The orthographic projection of the portion of the first adapter 122 extending through the first through hole 231 and the orthographic projection of the second sub-part 2342 are spaced apart. The portion of the first adapter 122 extending through the first through hole 231 and the second sub-part 2342 do not have overlapping thicknesses and can share part of the space in the first direction X, which is beneficial to improving space utilization.

[0187] 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.

[0188] In some embodiments, refer to Figure 6 and Figure 7 The first through hole 231 is formed by a first sub-part 2341 and a second sub-part 2342. A portion of the first conductive part 12 passes through the first through hole 231 and then bends towards the first sub-part 2341. This reduces the height difference in the first direction X between the position where the first conductive part 12 exits the first through hole 231 and the position where the first conductive part 12 is welded to the first wall 23, reduces the arching of the first conductive part 12 in the recess 232, reduces the space occupied by the first conductive part 12 in the first direction X in the recess 232, and also reduces the degree of bending of the first conductive part 12, thus reducing the risk of cracking of the first conductive part 12. Compared to the first through hole 231 being provided through the first sub-part 2341, the first through hole 231 being formed by the first sub-part 2341 and the second sub-part 2342 helps to reduce the size of the first sub-part 2341 and reduce the impact of the first sub-part 2341 on the structural strength of the first wall 23.

[0189] In some alternative embodiments, the first through hole 231 may also extend through the first sub-part 2341.

[0190] In some embodiments, refer to Figure 6 and Figure 7The second part 234 includes a third sub-part 2343, which connects the first part 233 and the second sub-part 2342. Along the first direction X, the third sub-part 2343 is further away from the main body 11 than the second surface 2342a on its third surface. The battery cell 6 includes a cover 30 connected to the third surface 2343a, which covers the first through-hole 231 along the first direction X.

[0191] In one example, along the first direction X, the surface of the second sub-part 2342 facing the main body 11 is closer to the main body 11 than the surface of the third sub-part 2343 facing the main body 11. In another example, along the first direction X, the surface of the second sub-part 2342 facing the main body 11 may also be flush with the surface of the third sub-part 2343 facing the main body 11.

[0192] Along the direction from the first wall 23 toward the main body 11, a portion of the third sub-part 2343 may extend beyond the fourth surface 233a, or the third sub-part 2343 may not extend beyond the fourth surface 233a. Optionally, along the first direction X, the surface of the third sub-part 2343 facing the main body 11 is flush with the fourth surface 233a.

[0193] The connection methods between the cover 30 and the third surface 2343a include, but are not limited to, welding or bonding.

[0194] The cover 30 can be a conductive component or an insulating component.

[0195] Along the direction from the first wall 23 to the main body 11, the cover 30 covers the portion of the first conductive part 12 that extends out of the first through hole 231.

[0196] In one example, along the direction from the main body 11 toward the first wall 23, a portion of the cover 30 extends beyond the surface of the first portion 233 away from the main body 11, and the cover 30 is partially received within the recess 232. In another example, the cover 30 is entirely received within the recess 232.

[0197] The cover 30 can prevent external particles, water, and other impurities from entering the housing 20 through the first through-hole 231, causing contamination or short circuit risk. At least a portion of the cover 30 can be accommodated in the recess 232. The cover 30 and the first portion 233 share a portion of the space in the first direction X, which is beneficial to improving space utilization and increasing the energy density of the battery cell 6.

[0198] In some embodiments, refer to Figure 9 and Figure 10 The battery cell 6 includes a second insulating member 52, which is configured to fix the first insulating member 51 to the main body 11.

[0199] There are several ways in which the second insulating member 52 fixes the first insulating member 51 to the main body 11. The second insulating member 52 may be connected to at least one of the first insulating member 51 and the main body 11, or it may not be connected to either the first insulating member 51 or the main body 11.

[0200] For example, the second insulating member 52 is connected to the first insulating member 51 and the main body portion 11. The second insulating member 52 may be strip-shaped, U-shaped, L-shaped, ring-shaped or other shapes.

[0201] For example, the second insulating member 52 is U-shaped, surrounds the first insulating member 51 and is connected to the main body 11, thereby confining the first insulating member 51 to the side of the main body 11 near the first wall 23. The second insulating member 52 may be connected to the first insulating member 51 or may not be connected to the first insulating member 51.

[0202] For example, the second insulating member 52 is annular and surrounds the first insulating member 51 and the main body 11, tightly binding the first insulating member 51 and the main body 11 together. The second insulating member 52 may not be connected to either the first insulating member 51 or the main body 11.

[0203] The provision of the second insulating member 52 helps to limit the displacement and shaking of the first insulating member 51 within the housing 20, improving the stability of the first insulating member 51, thereby improving the insulation effect and increasing the reliability of the battery cell 6. Furthermore, the provision of the second insulating member 52 also helps to improve the insulation effect between the main body 11 and the housing 20.

[0204] In some embodiments, the second insulating member 52 is connected to at least one of the main body portion 11 and the first insulating member 51. This improves the stability of the second insulating member 52 relative to the main body portion 11 and / or the first insulating member 51, thereby enhancing the fixing effect of the second insulating member 52 on the first insulating member 51.

[0205] In one example, the second insulating member 52 is directly or indirectly connected to the main body portion 11. The connection between the second insulating member 52 and the main body portion 11 includes, but is not limited to, adhesive bonding.

[0206] In one example, the second insulating member 52 is directly or indirectly connected to the first insulating member 51. The connection between the second insulating member 52 and the first insulating member 51 includes, but is not limited to, bonding or heat fusion.

[0207] In some embodiments, refer to Figure 10 and Figure 11The battery cell 6 includes a third insulating member 53, which covers at least a portion of the outer side of the main body 11 and is thermally fused with the first insulating member 51 to form a welded portion N. The first insulating member 51 has a first end face 51a and a side face 51b. The first end face 51a faces the first wall 23 along the first direction X, and the side face 51b intersects with the first end face 51a. A second insulating member 52 is connected to the side face 51b.

[0208] The third insulating member 53 is used to insulate and isolate the main body 11 from the outer casing 20. The third insulating member 53 may completely cover the outer side of the main body 11, or it may only cover a portion of the main body 11. Optionally, the third insulating member 53 covers at least two surfaces of the main body 11 along the second direction Y and two surfaces of the main body 11 along the third direction Z, wherein the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Along the direction from the main body 11 to the first wall 23, a portion of the third insulating member 53 extends beyond the main body 11 and is connected to the first insulating member 51.

[0209] Optionally, the third insulating element 53 includes an insulating film.

[0210] The first end face 51a can be a single surface or include multiple surfaces.

[0211] Side surface 51b is connected to first end face 51a. Side surface 51b includes a surface of the first insulating member 51 along the second direction Y and a surface of the first insulating member 51 along the third direction Z. Second insulating member 52 may be connected to any one or more surfaces of the first insulating member 51 in the second direction Y and the third direction Z.

[0212] The second insulating element 52 is connected to the side 51b. The second insulating element 52 can be a strip, U-shaped, L-shaped or ring-shaped structure, which helps to improve the flexibility of selecting the first insulating element 51.

[0213] In some embodiments, refer to Figure 10 The support portion 512 includes a fifth surface 512a and two sixth surfaces 512b opposite each other along a third direction Z. The fifth surfaces 512a of two adjacent support portions 512 are arranged opposite each other along a second direction Y. The side surface 51b includes the fifth surface 512a and the sixth surface 512b of each support portion 512, and the second insulating member 52 is connected to at least one of the fifth surface 512a and the sixth surface 512b.

[0214] Optionally, there are two second insulating members 52, and the two second insulating members 52 are respectively connected to the two support portions 512.

[0215] In some embodiments, refer to Figure 10The second insulating member 52 includes a first fixing portion 521 and two second fixing portions 522 spaced apart along a third direction Z. At least a portion of the first fixing portion 521 is located between the first insulating member 51 and the first wall 23 along the first direction X, and the first fixing portion 521 connects to the two second fixing portions 522. The two second fixing portions 522 are respectively connected to two opposing surfaces of the main body portion 11 along a third direction Z.

[0216] The first fixing part 521 may be connected to the first insulating member 51 by adhesive or other means. Alternatively, the first fixing part 521 may only contact the first insulating member 51 without being connected to it. Optionally, the first fixing part 521 may be adhesively attached to the first end face 51a.

[0217] The second fixing part 522 may be connected to the first insulating member 51 by adhesive or other means, or it may not be connected to the first insulating member 51. Optionally, the second fixing part 522 may be adhesively attached to the side surface 51b.

[0218] Along the third direction Z, a portion of the second fixing part 522 overlaps with the main body part 11. The overlapping portions of the two second fixing parts 522 and the main body part 11 may have the same or different dimensions along the first direction X.

[0219] Two second fixing parts 522 are respectively connected to the two ends of the first fixing part 521 along the third direction Z. The second insulating member 52 is U-shaped as a whole. The second insulating member 52 is an integral structure, which helps to simplify the structure and assembly of the second insulating member 52. Both second fixing parts 522 are connected to the main body 11. The second insulating member 52 can exert a balanced binding effect on the first insulating member 51, reducing the possibility of the first insulating member 51 shifting or tilting on either side along the third direction Z, and improving the stability of the first insulating member 51 relative to the main body 11.

[0220] In some embodiments, the orthographic projections of the first fixing part 521 and the first through hole 231 are spaced apart in the same plane perpendicular to the first direction X. This helps to reduce interference between the first fixing part 521 and the first conductive part 12, and facilitates the smooth passage of a portion of the first conductive part 12 through the first wall 23.

[0221] In some embodiments, refer to Figure 11 The battery cell 6 includes a third insulating member 53, which covers at least a portion of the outer side of the main body 11 and is thermally fused with the first insulating member 51 to form a welded portion N. The first insulating member 51 has a first end face 51a and a side face 51b. The first end face 51a faces the first wall 23 along the first direction X, and the side face 51b intersects with the first end face 51a. At least a portion of the second insulating member 52 is located between the side face 51b and the third insulating member 53, and the welded portion N is spaced apart from the second insulating member 52.

[0222] The second insulating member 52 may be entirely located between the side surface 51b and the third insulating member 53, or only a portion of the second insulating member 52 may be located between the side surface 51b and the third insulating member 53. The third insulating member 53 covers at least a portion of the second insulating member 52, which helps to improve the fixing effect of the second insulating member 52 on the first insulating member 51.

[0223] The welded portion N and the second insulating member 52 are spaced apart, meaning that the welded portion N and the second insulating member 52 are separate from each other. The welded portion N and the second insulating member 52 are spaced apart along the second direction Y, or the welded portion N and the second insulating member 52 are spaced apart along the third direction Z. The third insulating member 53 is welded to the portion of the first insulating member 51 that does not overlap with the second insulating member 52.

[0224] The welded part N is spaced apart from the second insulating member 52, which can reduce the adverse effects of the heat generated during the thermal fusion connection of the third insulating member 53 and the first insulating member 51 on the second insulating member 52, reduce the risk of the second insulating member 52 being partially melted and affecting its structural strength, and also reduce the risk of the third insulating member 53 being damaged by the warping caused by the partial melting of the second insulating member 52 or causing the third insulating member 53 to warp.

[0225] In some embodiments, refer to Figures 12 to 14 The portion of the first conductive part 12 that is accommodated in the recess 232 is welded to the second part 234 to form a welded part W. Direct welding of the first conductive part 12 to the first wall 23 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 on the outside reduces the probability of welding particles falling into the housing 20, thus reducing the risk of short circuits and improving reliability.

[0226] In some embodiments, refer to Figure 13 The battery cell 6 includes a fourth insulating member 54 disposed between the second portion 234 and the main body portion 11 along the first direction X. In the same plane perpendicular to the first direction X, the orthographic projection of the welded portion W and the orthographic projection of the fourth insulating member 54 at least partially overlap.

[0227] The fourth insulating member 54 can be connected to the second part 234 or to the main body 11. Optionally, the fourth insulating member 54 is bonded to the second part 234.

[0228] Optionally, in the same plane perpendicular to the first direction X, the orthographic projection of the welded part W is located within the orthographic projection of the fourth insulating member 54.

[0229] Optionally, the orthographic projection of the fourth insulating member 54 and the orthographic projection of the first through hole 231 are spaced apart in the same plane perpendicular to the first direction X.

[0230] At least a portion of the second part 234 is closer to the main body 11 than the first part 233, and the heat generated during the welding of the first conductive part 12 and the second part 234 is easily transferred to the main body 11. The welded part W and the fourth insulating member 54 at least partially overlap in their orthographic projections along the first direction X. The fourth insulating member 54 can reduce the heat transferred to the main body 11 during the welding of the first conductive part 12 and the second part 234, thereby reducing the adverse effects of the welding operation on the main body 11.

[0231] In some embodiments, the thermal conductivity of the fourth insulating member 54 is lower than that of the first wall 23. The lower thermal conductivity of the fourth insulating member 54 helps to reduce the heat transferred through it and improve its thermal insulation effect.

[0232] In some embodiments, the second portion 234 includes a first sub-portion 2341 and a second sub-portion 2342. Along the first direction X, the first sub-portion 2341 is closer to the main body portion 11 than the second sub-portion 2342. A first conductive portion 12 is welded to the first sub-portion 2341 to form a welded portion W. At least a portion of the fourth insulating member 54 is disposed between the first sub-portion 2341 and the main body portion 11.

[0233] Optionally, the fourth insulating member 54 completely covers the first sub-part 2341 along the direction from the main body 11 to the first wall 23. The fourth insulating member 54 is bonded to the first sub-part 2341.

[0234] The first sub-part 2341 is closer to the main body 11 than the second sub-part 2342, making it easier for the first sub-part 2341 to overlap with the main body 11. The fourth insulating member 54 can insulate and isolate the first sub-part 2341 from the main body 11, reducing the risk of short circuit caused by the overlap of the first sub-part 2341 and the main body 11.

[0235] In some embodiments, refer to Figures 4 to 7 The battery cell 6 includes a cover 30, which is connected to the first wall 23 and covers the first through hole 231 along the first direction X. The cover 30 can prevent external particles, water and other impurities from entering the housing 20 through the first through hole 231, causing pollution or short circuit risk.

[0236] The cover 30 can be a conductive component or an insulating component.

[0237] Optionally, along the direction from the first wall 23 to the main body 11, the cover 30 covers the portion of the first conductive part 12 that is accommodated in the recess 232.

[0238] In some embodiments, refer to Figures 5 to 7 Along the first direction X, at least a portion of the cover 30 is received in the recess 232.

[0239] The portion of the first conductive part 12 located on the side of the first wall 23 away from the main body part 11 is entirely accommodated within the recess 232. The cover 30 may be entirely accommodated within the recess 232, or only a portion of the cover 30 may be accommodated within the recess 232, with another portion of the cover 30 protruding from the recess 232, for example.

[0240] The recess 232 provides a receiving space for the portion of the first conductive part 12 that protrudes through the first through hole 231, and provides at least a partial receiving space for the cover 30. This helps to reduce the extra space occupied by the cover 30 and the first conductive part 12 in the first direction X, improves the space utilization rate in the first direction X, and thus increases the energy density of the battery cell 6.

[0241] In some embodiments, refer to Figure 14 The cover 30 is welded to the first wall 23 and is used to connect to the busbar component. The portion of the first conductive part 12 that is received in the recess 232 is welded to the second part 234 to form the welded part W. The battery cell 6 includes a separator 40, at least a portion of which is disposed between the cover 30 and the welded part W along the first direction X. The thermal conductivity of the separator 40 is less than that of the cover 30.

[0242] The cover 30 includes a conductive material. The material of the cover 30 may be the same as or different from the material of the first wall 23.

[0243] The cover 30 can replace the traditional electrode terminals and be welded to the busbar component, which helps to simplify the structure of the battery cell 6 and save the space occupied by the electrode terminals. The cover 30 is welded to the first wall 23, and the electrical connection between the cover 30 and the first conductive part 12 is achieved through the first wall 23, which helps to reduce the welding difficulty and improve the connection strength.

[0244] The isolator 40 can be a conductive component or an insulating component.

[0245] The separator 40 is at least partially disposed between the welded part W and the cover 30. The separator 40 has a low thermal conductivity, which can reduce the heat transferred to the welded part W during the welding of the cover 30 and the busbar component, reduce the adverse effects of the welding operation of the cover 30 and the busbar component on the welded part W, and reduce the risk of cracking or breaking of the welded part W leading to the failure of the connection between the first conductive part 12 and the first wall 23, thereby improving the reliability of the battery cell 6.

[0246] In some embodiments, refer to Figure 14 Along the direction from the first wall 23 to the main body 11, the spacer 40 completely covers the welded portion W. In other words, in the same plane perpendicular to the first direction X, the orthographic projection of the welded portion W lies within the orthographic projection of the spacer 40.

[0247] The orthographic projection of the welded part W and the orthographic projection of the spacer 40 can completely overlap, and the orthographic projection of the spacer 40 can also exceed the orthographic projection range of the welded part W.

[0248] The isolator 40 completely separates the welded part W from the cover 30 along the first direction X. The isolator 40 can prevent the heat generated during the welding of the cover 30 and the busbar component from being transferred to the welded part W, thereby reducing the adverse effects of the welding operation of the cover 30 and the busbar component on the welded part W.

[0249] In some embodiments, the isolator 40 is connected to at least one of the cover 30, the first conductive portion 12, and the weld portion W. This improves the installation stability of the isolator 40 and reduces the risk of the isolator 40 shifting or displacing and becoming completely misaligned with the weld portion W.

[0250] In some embodiments, refer to Figure 14 The isolator 40 is connected to the first conductive part 12 and / or the welded part W, and the cover 30 and the isolator 40 are spaced apart along the first direction X. This helps to reduce interference between the cover 30 and the isolator 40, reduce the adverse effects of the isolator 40 on the connection between the cover 30 and the first wall 23, and also reduce the risk of the welded part W cracking under pressure.

[0251] In other embodiments, the spacer 40 is connected to the cover 30, and the spacer 40 and the welded portion W are spaced apart along the first direction X. This helps to reduce interference between the spacer 40 and the welded portion W, reducing the risk of the welded portion W cracking under pressure. Furthermore, it can also block heat conduction between the spacer 40 and the welded portion W, reducing the efficiency of heat transfer to the welded portion W.

[0252] In some embodiments, the thermal conductivity of the insulating element 40 is less than or equal to 3.0 W / (mk). A lower thermal conductivity of the insulating element 40 helps reduce the heat transferred through it and improves its insulation performance.

[0253] In some embodiments, the melting point of the separator 40 is higher than that of the cover 30.

[0254] Alternatively, the spacer 40 may be a metal component, for example, the spacer 40 may be made of steel.

[0255] Optionally, the separator 40 can be a non-metallic component, for example, the separator 40 includes polyimide adhesive or mica, etc.

[0256] The high melting point of the isolator 40 helps reduce the risk of melting during welding of the cover 30 and the busbar component, improves the structural stability of the isolator 40, and thus improves the heat insulation effect of the isolator 40.

[0257] In some embodiments, the melting point of the separator 40 is greater than or equal to 250°C.

[0258] The high melting point of the insulating element 40 helps reduce the risk of melting after being heated, improves the structural stability of the insulating element 40, and thus improves the heat insulation effect of the insulating element 40.

[0259] In some embodiments, refer to Figure 5 , Figures 12 to 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.

[0260] In one example, refer to Figure 4 and Figure 5 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] In some embodiments, refer to Figure 5 The outer casing 20 includes two second walls 24 disposed 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 first conductive part 12 includes a first tab 121, which includes a plurality of first tab layers, and the first tab layers of the two first conductive parts 12 respectively converge toward the two second walls 24.

[0266] The third direction Z is parallel to the thickness direction of electrode unit 10.

[0267] 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.

[0268] 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.

[0269] In some embodiments, refer to Figures 12 to 14 Two first conductive parts 12 are arranged along the third direction Z, and two first through holes 231 are arranged at intervals along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. Both first conductive parts 12 are welded to the part of the second part 234 located between the two first through holes 231.

[0270] After the two first conductive parts 12 pass through the two first through holes 231 respectively, they bend towards the portion of the first wall 23 located between the two first through holes 231. The bending shape of each first conductive part 12 is roughly Z-shaped, which, compared with U-shaped or other bending shapes, helps to reduce the degree of bending of the first conductive part 12 and reduce the risk of cracking of the first conductive part 12.

[0271] In some embodiments, refer to Figures 12 to 14 The second part 234 includes a first sub-part 2341 and a second sub-part 2342. Along the first direction X, the first sub-part 2341 is closer to the main body 11 than the second sub-part 2342, which includes a second surface away from the main body 11. Along the third direction Z, at least a portion of the first sub-part 2341 is located between two first through holes 231. Both first conductive parts 12 are welded to the portion of the first sub-part 2341 located between the two first through holes 231.

[0272] In one example, a portion of the second sub-part 2342 is located on one side of the first sub-part 2341 along the third direction Z, and another portion of the second sub-part 2342 is located on the other side of the first sub-part 2341 along the third direction Z. Both first through holes 231 are formed by the first sub-part 2341 and the second sub-part 2342. The two first through holes 231 are respectively located on both sides of the first sub-part 2341 along the third direction Z.

[0273] In another example, both first through holes 231 penetrate the first sub-part 2341.

[0274] Both first conductive parts 12 are welded to the first sub-part 2341. The first sub-part 2341 is more recessed than the second sub-part 2342, which can provide more space for the two first conductive parts 12, thereby improving space utilization. The second part 234 only needs to have one first sub-part 2341 with a larger recess, which helps to reduce the molding difficulty.

[0275] In some embodiments, refer to Figures 12 to 14 In the same plane perpendicular to the first direction X, the orthographic projections of the two first conductive parts 12 are spaced apart. In this way, the two first conductive parts 12 do not overlap in the first direction X, and can share the space in the first direction X, thereby improving space utilization; it also helps to reduce interference between the two first conductive parts 12 and reduce the risk of edge warping, bending deformation, etc., which affect the welding strength of the first conductive parts 12.

[0276] In some embodiments, refer to Figure 14 Two first conductive portions 12 are welded to the first wall 23 to form two welded portions W. In one example, the battery cell 6 includes two separators 40, which are respectively connected to the two first conductive portions 12. Along the first direction X, at least a portion of the two separators 40 is located between the two welded portions W and the cover 30. This reduces the size of a single separator 40 and simplifies the connection between the separator 40 and the first conductive portions 12.

[0277] In another example, the separator 40 is a single unit, with a portion of the separator 40 disposed between one of the welded portions W and the cover 30 along the first direction X, and another portion of the separator 40 disposed between another welded portion W and the cover 30. This simplifies the structure and assembly process of the battery cell 6.

[0278] In some embodiments, refer to Figures 5 to 8 The first conductive part 12 includes a first tab 121 and a first adapter part 122. The first tab 121 is connected to the main body part 11, the first adapter part 122 is welded to the first tab 121, the first adapter part 122 passes through the first through hole 231, and a part of the first adapter part 122 is accommodated in the recess 232 and connected to the first wall 23.

[0279] In one example, the first tab 121 is entirely located on the side of the first wall 23 near the main body 11. Alternatively, a portion of the first tab 121 is located on the side of the first wall 23 near the main body 11, and another portion of the first tab 121 can be accommodated in the first through hole 231, without the first tab 121 protruding out of the first through hole 231.

[0280] A portion of the first adapter 122 is located on the side of the first wall 23 near the main body 11 and is welded to the first tab 121. A portion of the first adapter 122 extends through the first through hole 231 and is welded to the first wall 23.

[0281] 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.

[0282] In some embodiments, refer to Figures 5 to 8 The first electrode tab 121 is located on the side of the first wall 23 near the main body 11. The first electrode tab 121 does not pass through the first through hole 231, which helps to reduce the number of bends of the first electrode tab 121, reduce the interference between the first electrode tab 121 and the first wall 23, and reduce the risk of cracking due to stress concentration in a local area of ​​the first electrode tab 121.

[0283] In some embodiments, refer to Figures 6 to 8 The first adapter 122 includes two adapter layers 1221. The end of the first tab 121 away from the main body 11 is located between the two adapter layers 1221 and is welded to the two adapter layers 1221.

[0284] 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.

[0285] The welding methods for the transition layer 1221 and the first tab 121 include, but are not limited to, ultrasonic welding or laser welding.

[0286] The thicknesses of the two transition layers 1221 can be the same or different.

[0287] Either of the two transition layers 1221 passes through the first through hole 231 and extends to the side of the first wall 23 away from the main body 11. Alternatively, both transition layers 1221 pass through the first through hole 231 and extend to the side of the first wall 23 away from the main body 11.

[0288] In one example, the first tab 121 is entirely disposed on the side of the first wall 23 near the main body 11, and only at least one of the two transition layers 1221 passes through the first through hole 231. In another example, both transition layers 1221 and the first tab 121 located between the two transition layers 1221 pass through the first through hole 231.

[0289] 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.

[0290] In some embodiments, refer to Figures 6 to 8 The two transition layers 1221 are stacked and welded to the first wall 23 on the side of the first wall 23 away from the main body 11. The stacking and welding of the two transition layers 1221 to the first wall 23 is beneficial to the welding strength and stability.

[0291] The welding methods for the transition layer 1221 and the first wall 23 include, but are not limited to, ultrasonic welding or laser welding.

[0292] In other embodiments, the first conductive portion 12 includes a first tab 121, which passes through the first through hole 231. A portion of the first tab 121 is accommodated in a recess 232 and connected to the first wall 23. Optionally, the portion of the first tab 121 accommodated in the recess 232 is welded to a second portion 234 to form a welded portion W.

[0293] In some embodiments, refer to Figure 4 and Figure 5 The outer casing 20 includes a third wall 25, and the main body 11 is disposed between the first wall 23 and the third wall 25 along the first direction X. The battery cell 6 includes an electrode terminal 60 disposed on the third wall 25. 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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] In some embodiments, refer to Figure 5 The second conductive part 13 includes a second tab 131, which is connected to the main body part 11. The battery cell 6 includes two second conductive parts 13, and the second tabs 131 of the two second conductive parts 13 are disposed separately along a second direction Y, which is perpendicular to the first direction X.

[0300] In one example, refer to Figure 5 The battery cell 6 includes two electrode units 10, each electrode unit 10 including a second conductive portion 13. The second conductive portions 13 of the two electrode units 10 are respectively led out from the main body portion 11 of the two electrode units 10. The main body portions 11 of the two electrode units 10 are stacked along the second direction Y.

[0301] 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.

[0302] In one example, the battery cell 6 includes an adapter 80, which is welded to the electrode terminal 60 and to the second tab 131 of all electrode cells 10.

[0303] In another example, the second conductive part 13 also includes a second adapter part, which is soldered to the second tab 131 and the electrode terminal 60.

[0304] 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.

[0305] 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.

[0306] The adapter 80 is welded to the second electrode lug 131, and the adapter 80 is welded to the electrode terminal 60.

[0307] 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.

[0308] In some embodiments, refer to Figures 15 to 17 The outer casing 20 includes two second walls 24 disposed along a third direction Z. The battery cell 6 includes a third insulating member 53, a fifth insulating member 55, and a sixth insulating member 56. Along a first direction X, at least a portion of the fifth insulating member 55 is disposed between the main body portion 11 and the third wall 25; the third insulating member 53 covers the outside of the main body portion 11 and is connected to the fifth insulating member 55; along a third direction Z, a portion of the third insulating member 53 and at least a portion of the sixth insulating member 56 are stacked between the second wall 24 and the second conductive portion 13.

[0309] The fifth insulating member 55 is used to insulate and isolate the main body 11 and the third wall 25. Optionally, the fifth insulating member 55 is a plastic part.

[0310] Along the direction from the main body 11 to the third wall 25, a portion of the third insulating member 53 extends beyond the main body 11 and is connected to the fifth insulating member 55. The connection method between the third insulating member 53 and the fifth insulating member 55 includes, but is not limited to, heat fusion or bonding.

[0311] Along the direction from the main body 11 to the third wall 25, a portion of the third insulating member 53 extends beyond the main body 11 and is located between the second wall 24 and the second conductive part 13, thereby insulating and isolating the second wall 24 and the second conductive part 13.

[0312] Along the third direction Z, at least a portion of the sixth insulating member 56 is disposed between the second wall 24 and the second conductive part 13, thereby insulating and isolating the second wall 24 and the second conductive part 13.

[0313] Along the third direction Z, the portion of the third insulating member 53 located between the second wall 24 and the second conductive portion 13, and the portion of the sixth insulating member 56 located between the second wall 24 and the second conductive portion 13 are stacked.

[0314] Optionally, a portion of the third insulating member 53 extending beyond the main body 11 in the direction pointing from the main body 11 to the third wall 25 is disposed on one side of the second conductive portion 13 along the third direction Z, and another portion is disposed on the other side of the second conductive portion 13 along the third direction Z. A portion of the sixth insulating member 56 is disposed on one side of the second conductive portion 13 along the third direction Z, and another portion of the sixth insulating member 56 is disposed on the other side of the second conductive portion 13 along the third direction Z. Along the third direction Z, the portions of the third insulating member 53 and the sixth insulating member 56 located on the same side of the second conductive portion 13 are stacked.

[0315] Optionally, the sixth insulating element 56 includes an insulating film or an insulating sheet.

[0316] Both the third insulating member 53 and the sixth insulating member 56 can prevent the second conductive part 13 from overlapping with the second wall 24. The third insulating member 53 and the sixth insulating member 56 can form a double-layer insulation between the second wall 24 and the second conductive part 13, which helps to reduce the risk of short circuit caused by the second conductive part 13 overlapping with the second wall 24 due to warping, wrinkling or damage of either the third insulating member 53 or the sixth insulating member 56, thereby improving the reliability of the battery cell 6.

[0317] In some embodiments, along the second direction Y, the size of the sixth insulating member 56 is greater than or equal to the size of the second conductive portion 13, and the two ends of the second conductive portion 13 do not extend beyond the sixth insulating member 56 along the second direction Y.

[0318] The sixth insulating member 56 can prevent any area of ​​the second conductive part 13 in the second direction Y from overlapping with the second wall 24, thereby improving the insulation and isolation effect of the sixth insulating member 56 on the second conductive part 13 and the second wall 24.

[0319] In some embodiments, in the same plane perpendicular to the third direction Z, the orthographic projection of the second conductive part 13 lies within the orthographic projection of the sixth insulating part 56.

[0320] Along the third direction Z, the sixth insulating member 56 can completely cover the second conductive part 13, preventing any area of ​​the second conductive part 13 from overlapping with the second wall 24, thereby improving the insulation and isolation effect of the sixth insulating member 56 on the second conductive part 13 and the second wall 24.

[0321] In some embodiments, refer to Figures 15 to 17 The sixth insulating member 56 includes a first insulating portion 561 and a second insulating portion 562. Along the third direction Z, at least a portion of the first insulating portion 561 is disposed between the electrode unit 10 and the second wall 24. Along the first direction X, at least a portion of the second insulating portion 562 is disposed between the electrode unit 10 and the third wall 25.

[0322] Optionally, the first insulating part 561 and the second insulating part 562 are integrally formed.

[0323] Optionally, the second insulating portion 562 is connected to the fifth insulating member 55. The connection method between the second insulating portion 562 and the fifth insulating member 55 includes, but is not limited to, bonding or heat fusion.

[0324] Optionally, the first insulating part 561 is connected to at least one of the main body part 11, the third insulating member 53, and the fifth insulating member 55.

[0325] In one example, the sixth insulating member 56 is generally L-shaped. The sixth insulating member 56 includes a first insulating portion 561 and a second insulating portion 562. The first insulating portion 561 is disposed on either side of the second conductive portion 13 along the third direction Z, and the second insulating portion 562 is connected to the first insulating portion 561.

[0326] In another example, the sixth insulating member 56 is U-shaped. The sixth insulating member 56 includes two first insulating portions 561 and one second insulating portion 562. The two first insulating portions 561 are respectively disposed on both sides of the second conductive portion 13 along the third direction Z, and the second insulating portion 562 connects the two first insulating portions 561.

[0327] The first insulating part 561 insulates and isolates the electrode unit 10 and the second wall 24. The provision of the second insulating part 562 is beneficial to increasing the insulating area of ​​the sixth insulating member 56, and also beneficial to increasing the cooperation between the sixth insulating member 56 and other structures (such as the fifth insulating member 55), and facilitates the installation and fixing of the sixth insulating member 56.

[0328] In some embodiments, refer to Figure 5 The outer casing 20 includes a casing 21 and two end caps 22. The casing 21 has casing openings 211 on both sides along the first direction X. The two end caps 22 are connected to the casing 21 and cover the two casing openings 211 respectively. The first wall 23 is one of the end caps 22, and the third wall 25 is the other end cap 22.

[0329] 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 second part 234 (the welding order of the first wall 23 and the housing 21, and the welding order of the first conductive part 12 and the second part 234 can be interchanged); finally, the cover 30 can be connected to the first wall 23 to cover the first through hole 231.

[0330] 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.

[0331] 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.

[0332] 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 second part 234; finally, the cover 30 can be connected to the first wall 23 to cover the first through hole 231.

[0333] In some embodiments, refer to Figure 5 The outer casing 20 includes two fourth walls 26 arranged along the second direction Y. The fourth walls 26 connect the two second walls 24, and the fourth walls 26 connect the first wall 23 and the third wall 25.

[0334] Optionally, the two second walls 24 and the two fourth walls 26 are integrally formed to form the housing 21. The first wall 23 of one of the end caps 22 is welded to the housing 21, and the third wall 25 of the other end cap 22 is welded to the housing 21.

[0335] Reference Figures 3 to 17 This application provides a battery cell 6, which includes an electrode unit 10, a housing 20, and a first insulating member 51. The electrode unit 10 includes a main body 11 and a first conductive part 12 extending from the main body 11, and the main body 11 is housed within the housing 20. The housing 20 includes a first wall 23 located on one side of the main body 11 along a first direction X, and the first wall 23 has a first through hole 231. A recess 232 is provided on the side of the first wall 23 away from the main body 11, and the first wall 23 includes a first portion 233 and a second portion 234, which corresponds to the recess 232 along the first direction X. The first insulating member 51 has a second through hole 511 extending through in the first direction X, and the first conductive part 12 passes through the second through hole 511 and the first through hole 231. A portion of the first conductive part 12 is housed in the recess 232 and electrically connected to the first wall 23. Along the first direction X, at least a portion of the second part 234 is closer to the main body 11 than the first part 233, and at least a portion of the second part 234 is accommodated in the second through hole 511.

[0336] The second part 234 includes a first sub-part 2341 and a second sub-part 2342. Along the first direction X, the first surface 2341a of the first sub-part 2341 facing away from the main body 11 is closer to the main body 11 than the second surface 2342a of the second sub-part 2342. The surface of the first sub-part 2341 facing the main body 11 is closer to the main body 11 than the surface of the second sub-part 2342 facing the main body 11. The portion of the first conductive part 12 housed in the recess 232 is welded to the first sub-part 2341.

[0337] 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.

[0338] 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.

[0339] 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 extending from the main body portion; The housing includes a main body portion housed within it. The housing includes a first wall located on one side of the main body portion along a first direction, and the first wall has a first through hole. A recess is provided on the side of the first wall away from the main body portion. The first wall includes a first portion and a second portion. Along the first direction, the second portion corresponds to the recess, and at least a portion of the second portion is closer to the main body portion than the first portion. A first conductive portion passes through the first through hole, and a portion of the first conductive portion is housed in the recess and electrically connected to the first wall. as well as A first insulating member, along the first direction, is at least partially disposed between the main body portion and the first portion; In the same plane perpendicular to the second direction, the orthographic projection of the second portion at least partially overlaps with the orthographic projection of the first insulating member, wherein the second direction is perpendicular to the first direction.

2. The battery cell according to claim 1, characterized in that, The first insulating member includes at least two support portions spaced apart along the second direction, the support portions being used to abut against the main body portion, and at least a portion of the second portion being located between two adjacent support portions along the second direction.

3. The battery cell according to claim 1 or 2, characterized in that, The first insulating member is provided with a second through hole, the second through hole penetrates the first insulating member along the first direction, the first conductive part passes through the second through hole, and at least a portion of the second part is accommodated in the second through hole.

4. The battery cell according to claim 3, characterized in that, The first insulating member includes a connecting portion and at least two support portions spaced apart along the second direction. The connecting portion connects two adjacent support portions. Along the first direction, a portion of the support portion protrudes from the surface of the connecting portion near the main body. The second through hole penetrates the connecting portion along the first direction.

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

6. The battery cell according to claim 1, characterized in that, The first conductive part is connected to the second part, and the first through hole penetrates the second part along the first direction.

7. The battery cell according to claim 1, characterized in that, The second part includes a first sub-part and a second sub-part, wherein along the first direction, the first sub-part is closer to the main body than the second sub-part is closer to the main body than the second sub-part is closer to the main body than the second sub-part is. In the same plane perpendicular to the first direction, the orthographic projection of the portion of the first conductive part housed in the recess at least partially overlaps with the orthographic projection of the first sub-part, and is spaced apart from the orthographic projection of the second sub-part.

8. The battery cell according to claim 7, characterized in that, The first sub-part is closer to the main body than the first part, and in the same plane perpendicular to the second direction, the orthographic projection of the first sub-part at least partially overlaps with the orthographic projection of the first insulating member.

9. The battery cell according to claim 7 or 8, characterized in that, The second sub-part is closer to the main body than the first part, and in the same plane perpendicular to the second direction, the orthographic projection of the second sub-part at least partially overlaps with the orthographic projection of the first insulating member.

10. The battery cell according to claim 7, characterized in that, Along the first direction, a portion of the first conductive portion is located on the side of the second sub-portion closer to the main body portion; The first portion includes a fourth surface facing the main body portion, pointing in a direction along the first wall toward the main body portion, and both the first sub-part and the second sub-part extend beyond the fourth surface, wherein the dimension by which the second sub-part extends beyond the fourth surface is smaller than the dimension by which the first sub-part extends beyond the fourth surface.

11. The battery cell according to claim 7, characterized in that, The first insulating member includes a connecting portion and at least two support portions spaced apart along the second direction. The connecting portion 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. The connecting portion is provided with a second through hole extending along the first direction, and the first conductive portion passes through the second through hole; the first sub-part is partially accommodated in the second through hole, and a portion of the first sub-part extends beyond the second through hole along the direction of the first wall pointing towards the main body.

12. The battery cell according to claim 7, 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 accommodated in the recess. In the same plane perpendicular to the first direction, the orthographic projection of the portion of the first transition part located on the side of the first wall closer to the main body is spaced apart from the orthographic projection of the first sub-part.

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

14. The battery cell according to claim 7, characterized in that, The second part includes a third sub-part that connects the first part and the second sub-part. Along the first direction, the third surface of the third sub-part is further away from the main body than the second surface. The battery cell includes a cover attached to the third surface, and the cover covers the first through hole along the first direction.

15. The battery cell according to claim 1, characterized in that, The battery cell includes a second insulating member configured to fix the first insulating member to the main body.

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

17. The battery cell according to claim 15 or 16, characterized in that, The second insulating member includes a first fixing part and two second fixing parts spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. 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 third direction.

18. The battery cell according to claim 17, characterized in that, In the same plane perpendicular to the first direction, the orthographic projection of the first fixing part and the orthographic projection of the first through hole are spaced apart.

19. The battery cell according to claim 15, characterized in that, The battery cell includes a third insulating member, which covers at least a portion of the outer side of the main body and is thermally fused with the first insulating member to form a welded portion. The first insulating member has a first end face and a side face, the first end face faces the first wall along the first direction, the side face intersects with the first end face, at least a portion of the second insulating member is located between the side face and the third insulating member, and the welded portion is spaced apart from the second insulating member.

20. The battery cell according to claim 1, characterized in that, The portion of the first conductive part that is accommodated in the recess is welded to the second part to form a welded portion.

21. The battery cell according to claim 20, characterized in that, The battery cell includes a fourth insulating member. Along the first direction, the fourth insulating member is disposed between the second part and the main body. In the same plane perpendicular to the first direction, the orthographic projection of the welded part and the orthographic projection of the fourth insulating member at least partially overlap.

22. The battery cell according to claim 21, characterized in that, The second part includes a first sub-part and a second sub-part. Along the first direction, the first sub-part is closer to the main body than the second sub-part. The first conductive part is welded to the first sub-part to form the welded part. At least a portion of the fourth insulating member is disposed between the first sub-part and the main body.

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

24. The battery cell according to claim 23, characterized in that, Along the first direction, at least a portion of the cover is received in the recess.

25. The battery cell according to claim 23 or 24, characterized in that, The cover is welded to the first wall and is used to connect to the busbar component; The portion of the first conductive part that is accommodated in the recess is welded to the second part to form a welded portion; The battery cell includes a separator, and at least a portion of the separator is disposed between the cover and the welded portion along the first direction. The thermal conductivity of the separator is less than that of the cover.

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

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

28. The battery cell according to claim 26 or 27, characterized in that, Two first conductive parts are arranged along a third direction, and two first through holes are spaced apart along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Both first conductive parts are welded to the portion of the second part located between the two first through holes.

29. The battery cell according to claim 28, characterized in that, The second part includes a first sub-part and a second sub-part. Along the first direction, the first surface of the first sub-part facing away from the main body is closer to the main body than the second surface of the second sub-part facing away from the main body. Along the third direction, at least a portion of the first sub-part is located between two first through holes, and two first conductive parts are welded to the portion of the first sub-part located between the two first through holes.

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

31. The battery cell according to claim 1, characterized in that, The first conductive part includes a first electrode and a first adapter. The first electrode is connected to the main body, the first adapter is welded to the first electrode, the first adapter passes through the first through hole, and a portion of the first adapter is accommodated in the recess and connected to the first wall.

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

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

34. The battery cell according to claim 1, characterized in that, The first conductive part includes a first tab, which passes through the first through hole, and a portion of the first tab is accommodated in the recess and connected to the first wall.

35. The battery cell according to claim 1, characterized in that, The outer casing includes a third wall, and along the first direction, the main body portion is disposed between the first wall and the third wall; The battery cell includes an electrode terminal disposed on the third wall, and the electrode unit includes a second conductive part, which extends from the main body and is electrically connected to the electrode terminal.

36. The battery cell according to claim 35, 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 parts, and the second tabs of the two second conductive parts are separately arranged along a third direction, with the first direction, the second direction and the third direction being perpendicular to each other.

37. The battery cell according to claim 35 or 36, characterized in that, The second conductive part includes a second tab, which is connected to the main body. The battery cell includes an adapter that connects the second tab and the electrode terminal.

38. The battery cell according to claim 35, characterized in that, The outer casing includes two second walls disposed along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; The battery cell includes a third insulating member, a fifth insulating member, and a sixth insulating member. Along the first direction, at least a portion of the fifth insulating member is disposed between the main body and the third wall. The third insulating member covers at least a portion of the outer side of the main body and is connected to the fifth insulating member. Along the third direction, a portion of the third insulating member and at least a portion of the sixth insulating member are stacked between the second wall and the second conductive portion.

39. The battery cell according to claim 38, characterized in that, Along the second direction, the size of the sixth insulating member is greater than or equal to the size of the second conductive portion, and the two ends of the second conductive portion along the second direction do not extend beyond the sixth insulating member.

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

41. The battery cell according to claim 38, characterized in that, The sixth insulating member includes a first insulating portion and a second insulating portion. Along the third direction, at least a portion of the first insulating portion is disposed between the electrode unit and the second wall. Along the first direction, at least a portion of the second insulating portion is disposed between the electrode unit and the third wall.

42. The battery cell according to claim 35, 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.

43. The battery cell according to claim 35, 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.

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

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

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