Battery cell, battery, and electrical device

Abstract

The present application provides a battery cell, a battery, and an electrical device. The battery cell comprises a casing, an electrode assembly, a first electrode terminal, a first insulating member, and a connecting member. The casing has a wall portion, and the electrode assembly is accommodated within the casing. The electrode assembly has a first electrode lead-out portion. The first electrode terminal is arranged on the wall portion, and the first electrode terminal is electrically connected to the first electrode lead-out portion. The first insulating member is configured to separate the first electrode terminal and the wall portion. The connecting member is electrically connected to the first electrode terminal and the casing, and the minimum current-carrying area of the connecting member is smaller than the minimum current-carrying area of the first electrode lead-out portion. The first electrode terminal is electrically connected to the casing by means of the connecting member, so that the casing can output electric energy of the electrode assembly. A battery management system can be connected to the casing of the battery cell, thereby achieving monitoring of the battery cell, and greatly reducing wiring difficulty. When a short circuit occurs in the battery cell, the connecting member can automatically fuse, so that the electrode assembly is protected, thereby facilitating improvement of the reliability of the battery cell.

Description

Battery cells, batteries and electrical equipment Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery cell, a battery, and an electrical device. Background Art

[0002] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. The development of battery technology requires consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the difficulty of battery wiring must be considered. Currently, battery wiring presents significant challenges.

[0003] Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a battery cell, a battery, and an electrical device, which aims to improve the problem of difficult wiring of batteries in related technologies.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, a first electrode terminal, a first insulating member and a connecting member, wherein the shell has a wall portion; the electrode assembly is accommodated in the shell, and the electrode assembly has a first electrode lead-out portion; the first electrode terminal is arranged on the wall portion, and the first electrode terminal is electrically connected to the first electrode lead-out portion; the first insulating member is configured to separate the first electrode terminal and the wall portion; the connecting member electrically connects the first electrode terminal and the shell, and the minimum flow area of ​​the connecting member is smaller than the minimum flow area of ​​the first electrode lead-out portion.

[0006] In the above technical solution, the first electrode terminal of the battery cell is electrically connected to the outer casing via a connector, enabling the outer casing to output electrical energy from the electrode assembly. The battery management system can be connected to the outer casing of the battery cell, thereby enabling monitoring of the battery cell and significantly reducing wiring complexity. Furthermore, the connector has a minimum flow area that is smaller than that of the first electrode lead-out portion, and the connector has a fuse protection function. When a short circuit occurs in the battery cell, the connector automatically fuses, thereby protecting the electrode assembly, reducing the risk of fire and explosion in the battery cell, and improving the reliability of the battery cell.

[0007] As an optional technical solution of an embodiment of the present application, a mounting hole is provided on the wall portion, the first electrode terminal includes a terminal body and a first limiting portion, the terminal body is at least partially accommodated in the mounting hole, the first limiting portion is provided at one end of the terminal body, and along the thickness direction of the wall portion, the first limiting portion is arranged opposite to the wall portion, and the connecting member connects the first limiting portion and the wall portion.

[0008] In the above technical solution, the terminal body is at least partially accommodated in the mounting hole. The first stopper is connected to one end of the terminal body and is disposed opposite the wall portion to prevent the terminal body from escaping from the mounting hole in the direction of the first stopper toward the wall portion. The connector connects the first stopper and the wall portion, thereby achieving electrical connection between the first electrode terminal and the housing.

[0009] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the connecting member is located between the first limiting portion and the wall portion.

[0010] In the above technical solution, by arranging the connecting member between the first limiting portion and the wall portion, the risk of interference between the connecting member and other components is reduced, so that the connecting member can stably connect the first limiting portion and the wall portion, which is beneficial to improving the life of the battery cell.

[0011] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the first limiting portion is arranged on a side of the wall portion away from the electrode assembly.

[0012] In the above technical solution, the first stopper is located on the side of the wall facing away from the electrode assembly. Since the connector is located between the wall and the first stopper, the connector is also located on the side of the wall facing away from the electrode assembly. By locating the connector on the side of the wall facing away from the electrode assembly, the connector is less susceptible to the effects of the electrolyte, which helps to extend the life of the connector and thus increase the number of cycles of the battery cell.

[0013] As an optional technical solution of an embodiment of the present application, a first through hole is provided on the first insulating member, the first through hole passes through the first insulating member along the thickness direction of the wall portion, and the connecting member is at least partially accommodated in the first through hole.

[0014] In the above technical solution, the provision of the first through-hole in the first insulating member facilitates the avoidance of the connector, thereby allowing the connector to connect to the first limiting portion and the wall portion. Furthermore, at least partial accommodation of the connector within the first through-hole protects the connector, further reducing the risk of interference between the connector and other components. This allows the connector to stably connect to the first limiting portion and the wall portion, thereby improving the lifespan of the battery cell.

[0015] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the first limiting portion is arranged on a side of the wall portion facing the electrode assembly.

[0016] In the above technical solution, the first stopper is located on the side of the wall facing the electrode assembly. Since the connector is located between the wall and the first stopper, the connector is also located on the side of the wall facing the electrode assembly. By locating the connector on the side of the wall facing the electrode assembly, it is less likely to interfere with other components, which helps to extend the life of the battery cells.

[0017] As an optional technical solution of an embodiment of the present application, the battery cell includes a second insulating member, which is arranged on the side of the wall portion facing the electrode assembly along the thickness direction of the wall portion, and the second insulating member is configured to insulate and isolate the wall portion and the electrode assembly; a second through hole is provided on the second insulating member, and the second through hole passes through the second insulating member along the thickness direction of the wall portion, and the connecting member is at least partially accommodated in the second through hole.

[0018] In the above technical solution, a second insulating member is provided to insulate and isolate the wall portion and the electrode assembly, thereby reducing the risk of a short circuit caused by contact between the wall portion and the electrode assembly. Providing a second through-hole in the second insulating member facilitates the avoidance of the connector, thereby allowing the connector to connect to the first limiting portion and the wall portion. Furthermore, at least partially accommodating the connector within the second through-hole protects the connector, further reducing the risk of interference between the connector and other components, and making the connector less susceptible to the effects of the electrolyte, thereby improving the life of the connector and thereby increasing the number of battery cell cycles.

[0019] As an optional technical solution of the embodiment of the present application, the connecting member is an elastic element, and along the thickness direction of the wall portion, two ends of the connecting member are respectively in contact with the first limiting portion and the wall portion.

[0020] In the above technical solution, since the connector is an elastic element, it can apply elastic force to the first limiting portion and the wall portion, ensuring stable contact between the connector and the first limiting portion and the wall portion. This helps to prolong the life of the battery cell. In addition, during the manufacture of the battery cell, the electrical connection between the first limiting portion and the wall portion can be achieved simply by squeezing the connector through the first limiting portion and the wall portion, which is simple and convenient.

[0021] As an optional technical solution of the embodiment of the present application, the elastic element includes a spring.

[0022] In the above technical solution, since the deformation direction of the spring is highly controllable and has low cost, using the spring as a connecting member can not only facilitate manufacturing but also reduce manufacturing costs.

[0023] As an optional technical solution of an embodiment of the present application, the spring includes a first connecting part, a fuse part and a second connecting part, the fuse part connects the first connecting part and the second connecting part, the first connecting part and the second connecting part are respectively connected to the first limiting part and the wall part, the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connecting part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the second connecting part.

[0024] In the above technical solution, the first connection portion is connected to the first limit portion, the second connection portion is connected to the wall portion, and the fuse portion connects the first and second connection portions. The minimum flow area of ​​the fuse portion is smaller than the minimum flow area of ​​the first connection portion and smaller than the minimum flow area of ​​the second connection portion. When the current passing through the fuse portion is too large, the fuse portion will automatically melt, disconnecting the first and second connection portions, thereby providing protection, reducing the risk of fire and explosion of the battery cells, and improving the reliability of the battery cells.

[0025] As an optional technical solution of an embodiment of the present application, the wall portion is provided with a protrusion, the protrusion and the first limiting portion are located on the same side of the wall portion along the thickness direction of the wall portion, and the connecting member connects the protrusion and the first limiting portion.

[0026] In the above technical solution, a protrusion is provided on the wall portion so that the protrusion and the first limiting portion are located on the same side of the wall portion along the thickness direction of the wall portion, thereby facilitating the connection portion to overlap the protrusion and the first limiting portion to achieve electrical connection between the first electrode terminal and the shell.

[0027] As an optional technical solution of the embodiment of the present application, the first limiting portion is provided with a first card slot, the protruding portion is provided with a second card slot, and the connecting member is clamped in the first card slot and the second card slot.

[0028] In the above technical solution, by setting a first card slot on the first limiting portion and a second card slot on the protruding portion, the connecting member can be clamped in the first card slot and the second card slot, which is convenient for quickly positioning the connecting member and electrically connecting the first limiting portion and the protruding portion, which is conducive to simplifying installation.

[0029] As an optional technical solution of an embodiment of the present application, the protrusion has a first surface facing away from the wall portion, and the second slot is recessed from the first surface toward the direction facing the wall portion; along the thickness direction of the wall portion, the connecting member has a second surface closest to the first surface, and the minimum distance between the first surface and the second surface is A, satisfying: A≥0.2mm.

[0030] In the above technical solution, the connector is clamped in the second slot, and the minimum distance between the first surface and the second surface along the thickness direction of the wall is greater than or equal to 0.2 mm. In this way, the second slot can better protect the connector, reduce the risk of damage to the connector, and improve the life of the battery cell.

[0031] As an optional technical solution of the embodiment of the present application, 0.5mm≤A≤1mm.

[0032] In the above technical solution, by making the minimum distance between the first surface and the second surface along the thickness direction of the wall portion greater than or equal to 0.5mm, the distance between the connector and the first surface is greater, the connector is accommodated deeper in the second card slot, and the second card slot provides better protection for the connector. By making the minimum distance between the first surface and the second surface along the thickness direction of the wall portion less than or equal to 1mm, the distance between the connector and the first surface is not too large, and the protrusion height along the thickness direction of the wall portion is not too high. This can not only reduce the internal space occupied by the protrusion in the battery, but also reduce the risk of the protrusion interfering with other components. Therefore, when 0.5mm≤A≤1mm, it is possible to take into account both the protection of the connector and the reduction of the risk of the protrusion interfering with other components.

[0033] As an optional technical solution of an embodiment of the present application, the first insulating part includes a main body and a covering part, the covering part is arranged around the main body, and along the thickness direction of the wall part, the main body is located between the first limiting part and the wall part, and the covering part covers the outer peripheral surface of the first limiting part; a third card slot is provided on the covering part, and the connecting part is clamped in the third card slot.

[0034] In the above technical solution, the main body is located between the first retaining portion and the wall portion, and the covering portion covers the outer circumference of the first retaining portion, thereby better separating the first retaining portion and the wall portion and reducing the risk of direct contact between the first retaining portion and the wall portion. A third retaining slot is provided on the covering portion to avoid the connector, facilitating its engagement with the first and second retaining slots. By securing the connector in the first, second, and third retaining slots, quick positioning of the connector is facilitated and electrical connection between the connector and the first retaining portion is achieved, simplifying installation.

[0035] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the connecting member has a third surface closest to the bottom surface of the third slot, and the minimum distance between the third surface and the bottom surface of the third slot is B, satisfying: B≥0.2mm.

[0036] In the above technical solution, by making the minimum distance between the surface of the connector closest to the bottom of the third slot and the bottom of the third slot greater than or equal to 0.2 mm, the connector is farther away from the bottom of the third slot, reducing the risk of interference between the first insulating part and the connector when it moves, which is beneficial to improving the life of the connector and thereby increasing the number of cycles of the battery cell.

[0037] As an optional technical solution of the embodiment of the present application, 0.5mm≤B≤1mm.

[0038] In the above technical solution, by ensuring that the minimum distance between the third surface and the bottom of the third slot along the thickness direction of the wall portion is greater than or equal to 0.5 mm, the distance between the connector and the bottom of the third slot is relatively large. When the first insulating member moves, the first insulating member is less likely to collide with the connector, thereby minimizing damage to the connector. By ensuring that the minimum distance between the third surface and the bottom of the third slot along the thickness direction of the wall portion is less than or equal to 1 mm, the distance between the connector and the bottom of the third slot is not excessive, allowing the covering portion to still provide a good separation effect. Therefore, when 0.5 mm ≤ B ≤ 1 mm, both protection of the connector and the covering effect of the covering portion can be achieved.

[0039] As an optional technical solution of an embodiment of the present application, the connecting member is a strip structure extending along a first direction, and the first direction intersects with the thickness direction of the wall portion.

[0040] In the above technical solution, by configuring the connector as a strip extending in the first direction, the connector portion can easily overlap the protruding portion and the first retaining portion, thereby achieving electrical connection between the first electrode terminal and the housing. Furthermore, in embodiments where the connector is disposed in the first and second slots, this also facilitates the connector's engagement with the first and second slots.

[0041] As an optional technical solution of an embodiment of the present application, the connecting part includes a first connecting part, a fuse part and a second connecting part arranged along a first direction, the fuse part connects the first connecting part and the second connecting part, the first connecting part and the second connecting part are respectively connected to the first limiting part and the protrusion, the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connecting part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the second connecting part.

[0042] In the above technical solution, the first connection portion is connected to the first limit portion, the second connection portion is connected to the protrusion, and the fuse portion connects the first and second connection portions. The minimum flow area of ​​the fuse portion is smaller than the minimum flow area of ​​the first connection portion and smaller than the minimum flow area of ​​the second connection portion. When the current passing through the fuse portion is too large, the fuse portion will automatically melt, disconnecting the first and second connection portions, thereby providing protection, reducing the risk of fire and explosion of the battery cells, and improving the reliability of the battery cells.

[0043] As an optional technical solution of an embodiment of the present application, the battery cell includes a plurality of the connecting members, and the plurality of the connecting members are distributed at intervals along the circumference of the terminal body.

[0044] In the above technical solution, by providing multiple connectors, the current capacity can be increased, allowing the battery cell to output a larger current. By distributing the multiple connectors at intervals along the circumference of the terminal body, the force around the terminal body is made more uniform.

[0045] As an optional technical solution of an embodiment of the present application, a mounting hole is provided on the wall portion, the first electrode terminal includes a terminal body and a first limiting portion, the terminal body is at least partially accommodated in the mounting hole, the first limiting portion is provided at one end of the terminal body, and along the thickness direction of the wall portion, the first limiting portion is provided opposite to the wall portion, and the connecting member connects the wall portion and the terminal body.

[0046] In the above technical solution, the terminal body is at least partially accommodated in the mounting hole. The first stopper is connected to one end of the terminal body and is disposed opposite the wall portion to prevent the terminal body from escaping from the mounting hole in the direction of the first stopper toward the wall portion. The connector connects the terminal body and the wall portion, thereby achieving electrical connection between the first electrode terminal and the housing.

[0047] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the first limiting portion is arranged on a side of the wall portion away from the electrode assembly.

[0048] In the above technical solution, the first limiting portion is arranged on the side of the wall portion away from the electrode assembly, which can prevent the terminal body from escaping from the mounting hole along the wall portion toward the electrode assembly.

[0049] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the connecting member is located on the side of the wall portion away from the electrode assembly, and a first limiting groove is provided on the side of the first insulating member facing the wall portion, and the connecting member is accommodated in the first limiting groove.

[0050] In the above technical solution, by setting a first limiting groove on the first insulating member and accommodating the connecting member in the first limiting groove, it can not only limit the connecting member so that the connecting member can stably connect the terminal body and the wall, but also protect the connecting member.

[0051] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the first limiting portion is arranged on a side of the wall portion facing the electrode assembly.

[0052] In the above technical solution, the first limiting portion is arranged on the side of the wall facing the electrode assembly, which can prevent the terminal body from escaping from the mounting hole along the direction of the wall away from the electrode assembly.

[0053] As an optional technical solution of an embodiment of the present application, the battery cell includes a second insulating member. Along the thickness direction of the wall portion, the second insulating member is arranged on the side of the wall portion facing the electrode assembly. The second insulating member is configured to insulate and isolate the wall portion and the electrode assembly. The connecting member is located on the side of the wall portion facing the electrode assembly. A second limiting groove is provided on the side of the second insulating member facing the wall portion, and the connecting member is accommodated in the second limiting groove.

[0054] In the above technical solution, the provision of a second insulating member to insulate and isolate the wall portion and the electrode assembly reduces the risk of a short circuit caused by contact between the wall portion and the electrode assembly. Providing a second limiting groove on the second insulating member and accommodating the connector within the second limiting groove not only limits the connector, enabling it to stably connect the terminal body and the wall portion, but also protects the connector, reducing the risk of interference between the connector and other components and making it less susceptible to the effects of the electrolyte, thereby improving the life of the connector and thereby increasing the number of battery cell cycles.

[0055] As an optional technical solution of an embodiment of the present application, the connecting part includes a first connecting part, a fuse part and a second connecting part, the fuse part connects the first connecting part and the second connecting part, the first connecting part and the second connecting part are respectively connected to the terminal body and the wall part, the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connecting part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the second connecting part.

[0056] In the above technical solution, the first connection portion is connected to the terminal body, the second connection portion is connected to the wall portion, and the fuse portion connects the first and second connection portions. The minimum flow area of ​​the fuse portion is smaller than the minimum flow area of ​​the first connection portion and smaller than the minimum flow area of ​​the second connection portion. When the current passing through the fuse portion is too large, the fuse portion will automatically melt, disconnecting the first and second connection portions, thereby providing protection, reducing the risk of fire and explosion of the battery cell, and improving the reliability of the battery cell.

[0057] As an optional technical solution of an embodiment of the present application, the first connecting part and the second connecting part are both annular, the first connecting part is located on the inner side of the second connecting part, the first connecting part has a center hole, and the terminal body is passed through the center hole.

[0058] In the above technical solution, by making the first connecting portion and the second connecting portion both annular, it is convenient to connect the first connecting portion to the terminal body and the second connecting portion to the wall, and the force around the terminal body is uniform.

[0059] As an optional technical solution of an embodiment of the present application, the connecting member includes a plurality of the fuse parts, and the plurality of the fuse parts are arranged at intervals along the circumference of the first connecting part.

[0060] In the above technical solution, by providing multiple fuses, the overcurrent capacity can be increased, allowing the battery cells to output a larger current. By distributing the multiple fuses at intervals along the circumference of the first connecting portion, the force applied to the first and second connecting portions is more evenly distributed.

[0061] As an optional technical solution of an embodiment of the present application, the electrode terminal also includes a second limiting portion, and the second limiting portion and the first limiting portion are respectively located on both sides of the wall portion, and the second limiting portion and the first limiting portion are used to cooperate to limit the terminal body from detaching from the mounting hole.

[0062] In the above technical solution, the first and second limiting portions are provided, and they cooperate to prevent the terminal body from being dislodged from the mounting hole, thereby reducing the risk of the first electrode terminal being dislodged from the wall and extending the life of the battery cell. Furthermore, the first limiting portion, the terminal body, and the second limiting portion can be riveted together, simplifying manufacturing and increasing reliability.

[0063] As an optional technical solution of an embodiment of the present application, the connecting part includes a first connecting part, a fuse part and a second connecting part, the fuse part connects the first connecting part and the second connecting part, the first connecting part and the second connecting part are respectively connected to the first electrode terminal and the shell, the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connecting part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the second connecting part.

[0064] In the above technical solution, the first connection portion is connected to the first electrode terminal, the second connection portion is connected to the outer casing, and the fuse portion connects the first and second connection portions. The minimum flow area of ​​the fuse portion is smaller than the minimum flow area of ​​the first connection portion and smaller than the minimum flow area of ​​the second connection portion. When the current passing through the fuse portion is too large, the fuse portion will automatically melt, disconnecting the first and second connection portions to provide protection, reducing the risk of fire and explosion of the battery cells and improving the reliability of the battery cells.

[0065] As an optional technical solution of the embodiment of the present application, the battery cell includes a third insulating member, and the third insulating member is coated on the fuse part.

[0066] In the above technical solution, the third insulating member is provided to cover the fuse part, thereby protecting the fuse part, reducing the risk of damage to the fuse part, extending the life of the connector, and facilitating an increase in the number of cycles of the battery cell.

[0067] As an optional technical solution of the embodiment of the present application, the minimum flow area of ​​the fuse is S, which satisfies: 2mm 2 ≤S≤20mm 2 .

[0068] In the above technical solution, when S≥2mm 2 When S≤20mm, the fuse part has a larger flow area, so that the battery cell can output a larger current. 2 When the battery is short-circuited, the fuse part can be melted in time to play a protective role. 2 ≤S≤20mm 2 When the battery is short-circuited, it can not only enable the battery cell to output a larger current, but also be able to fuse in time when the battery cell is short-circuited.

[0069] As an optional technical solution of the embodiment of the present application, the length of the fuse portion is L, which satisfies: 0.3mm≤L≤5mm.

[0070] In the above technical solution, when L ≥ 0.3mm, the fuse has a longer length and higher resistance. When the battery cell short-circuits, it can generate a large amount of heat, causing the fuse to melt in time. When L ≤ 5mm, the fuse length is not too long and the resistance of the fuse is not too high, allowing the battery cell to output a larger current. Therefore, when 0.3mm ≤ L ≤ 5mm, the battery cell can both output a large current and melt in time when a short circuit occurs.

[0071] As an optional technical solution of the embodiment of the present application, the connecting member electrically connects the first electrode terminal and the wall portion.

[0072] In the above technical solution, by electrically connecting the first electrode terminal and the wall portion, the wall portion can output the electrical energy of the electrode assembly, and the battery management system can be connected to the wall portion to monitor the battery cell, greatly reducing the wiring difficulty.

[0073] As an optional technical solution of an embodiment of the present application, the battery cell further includes a second electrode terminal, which is insulated and mounted on the wall portion. The electrode assembly further includes a second electrode lead portion, and the second electrode terminal is electrically connected to the second electrode lead portion.

[0074] In the above technical solution, the outer casing can be electrically connected to the first electrode lead-out portion, and the second electrode terminal can be electrically connected to the second electrode lead-out portion. The outer casing can serve as the positive or negative electrode of the battery cell, and the second electrode terminal can serve as the negative or positive electrode of the battery cell to output the battery cell's electrical energy. When both the first and second electrode lead-out portions are electrically connected to the outer casing, the battery cell short-circuits, and the connector can automatically fuse, disconnecting the first electrode lead-out portion from the outer casing. This protects the electrode assembly, reduces the risk of fire or explosion in the battery cell, and helps improve the reliability of the battery cell.

[0075] As an optional technical solution of an embodiment of the present application, the first electrode terminal is a positive electrode terminal.

[0076] In the above technical solution, the first electrode terminal is electrically connected to the outer shell through the connecting piece, and the first electrode terminal is a positive electrode terminal, so that the outer shell is not easily corroded.

[0077] In a second aspect, an embodiment of the present application further provides a battery, which includes the above-mentioned battery cell.

[0078] In a third aspect, an embodiment of the present application further provides an electrical device, which includes the above-mentioned battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0080] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0081] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0082] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0083] FIG4 is an exploded view of a battery cell provided in some embodiments of the present application;

[0084] FIG5 is an exploded view of a wall portion and a first electrode terminal provided in some embodiments of the present application;

[0085] FIG6 is a schematic top view of a wall portion provided in some embodiments of the present application;

[0086] FIG7 is a cross-sectional view taken along line AA in FIG6 ;

[0087] FIG8 is an enlarged view of position B in FIG7 ;

[0088] FIG9 is an exploded view of a wall portion and a first electrode terminal provided in some other embodiments of the present application;

[0089] FIG10 is a schematic top view of a wall portion provided in some other embodiments of the present application;

[0090] FIG11 is a cross-sectional view taken along the CC line in FIG10 ;

[0091] FIG12 is an enlarged view of position D in FIG11 ;

[0092] FIG13 is a schematic structural diagram of a connector provided in some embodiments of the present application;

[0093] FIG14 is a schematic structural diagram of a connector (a third insulating member covering a fuse portion) provided in some embodiments of the present application;

[0094] FIG15 is an exploded view of a wall portion and a first electrode terminal provided in still other embodiments of the present application;

[0095] FIG16 is a schematic top view of a wall portion provided in some other embodiments of the present application;

[0096] FIG17 is a cross-sectional view of the EE position in FIG16;

[0097] FIG18 is an enlarged view of position F in FIG17 ;

[0098] FIG19 is a schematic structural diagram of connectors provided in some other embodiments of the present application;

[0099] FIG20 is a schematic structural diagram of a connector (a third insulating member covering a fuse portion) provided in yet other embodiments of the present application;

[0100] FIG21 is an exploded view of a wall portion and a first electrode terminal provided in some further embodiments of the present application;

[0101] FIG22 is a schematic top view of a wall portion provided in some further embodiments of the present application;

[0102] FIG23 is a cross-sectional view of the GG position in FIG22;

[0103] FIG24 is an enlarged view of position H in FIG23;

[0104] FIG25 is a schematic structural diagram of a connector provided in some further embodiments of the present application.

[0105] Icons: 10-case; 11-first part; 12-second part; 20-battery cell; 21-housing; 211-end cap; 212-housing; 213-wall; 2131-protrusion; 21311-second slot; 21312-first surface; 2132-mounting hole; 22-electrode assembly; 221-first electrode lead-out portion; 2211-first tab; 2212-first current collecting member; 222-second electrode lead-out portion; 2221-second tab; 2222-second current collecting member; 23-first electrode terminal; 231-first limiting portion; 2311-first slot; 232-terminal body; 233-second Limiting part; 24-first insulating part; 241-main body; 2411-first through hole; 242-covering part; 2421-third slot; 243-first limiting slot; 25-connecting part; 251-first connecting part; 2511-center hole; 252-fusing part; 253-second connecting part; 254-third insulating part; 255-second surface; 256-third surface; 26-second insulating part; 261-second through hole; 27-second electrode terminal; 271-limiting part; 272-rivet part; 28-fourth insulating part; 29-sealing part; 100-battery; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0106] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0107] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0108] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0109] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0110] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0111] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0112] The term "plurality" used in this application refers to two or more (including two).

[0113] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0114] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0115] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0116] 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.

[0117] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0118] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0119] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0120] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0121] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0122] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. may be used. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0123] As an example, the negative electrode sheet 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.

[0124] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0125] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0126] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0127] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0128] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0129] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0130] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0131] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0132] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0133] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0134] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0135] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0136] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0137] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0138] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0139] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0140] In some embodiments, the electrode assembly is a laminate structure.

[0141] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0142] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0143] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0144] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0145] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0146] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0147] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0148] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0149] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0150] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0151] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0152] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0153] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0154] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0155] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0156] The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the difficulty of battery wiring must be considered. Currently, battery wiring is quite difficult.

[0157] Batteries typically contain multiple cells to provide higher voltage and capacity. To monitor the parameters of each cell, a battery management system must be electrically connected to the positive and negative electrode terminals of each cell. However, the small size of the positive and negative terminals makes wiring more difficult.

[0158] In view of this, an embodiment of the present application provides a battery cell, comprising a housing, an electrode assembly, a first electrode terminal, a first insulating member, and a connector. The housing has a wall portion, the electrode assembly is accommodated within the housing, and the electrode assembly has a first electrode lead portion. The first electrode terminal is disposed on the wall portion, and the first electrode terminal is electrically connected to the first electrode lead portion. The first insulating member is configured to separate the first electrode terminal and the wall portion. The connector electrically connects the first electrode terminal and the housing, and the minimum flow area of ​​the connector is smaller than the minimum flow area of ​​the first electrode lead portion.

[0159] The first electrode terminal of the battery cell is electrically connected to the outer casing via a connector, enabling the outer casing to output electrical energy from the electrode assembly. The battery management system can be connected to the outer casing of the battery cell to monitor the battery cell, significantly reducing wiring complexity. Furthermore, the connector has a minimum flow area that is smaller than that of the first electrode lead-out portion. The connector also features a fuse protection feature. If a short circuit occurs in the battery cell, the connector will automatically fuse, protecting the electrode assembly and reducing the risk of fire or explosion in the battery cell, thereby improving the reliability of the battery cell.

[0160] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0161] Electrically powered devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0162] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0163] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0164] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0165] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. Alternatively, the first portion 11 and the second portion 12 can each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0166] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0167] Each battery cell 20 may be a secondary battery cell or a primary battery cell; it may also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0168] Please refer to Figures 3, 4, 5, 6, 7, and 8. Figure 3 is a schematic structural diagram of a battery cell 20 provided in some embodiments of the present application. Figure 4 is an exploded view of a battery cell 20 provided in some embodiments of the present application. Figure 5 is an exploded view of a wall portion 213 and a first electrode terminal 23 provided in some embodiments of the present application. Figure 6 is a schematic top view of a wall portion 213 provided in some embodiments of the present application. Figure 7 is a cross-sectional view taken at position AA in Figure 6. Figure 8 is an enlarged view taken at position B in Figure 7. Embodiments of the present application provide a battery cell 20, comprising a housing 21, an electrode assembly 22, a first electrode terminal 23, a first insulating member 24, and a connector 25. The housing 21 has a wall portion 213, and the electrode assembly 22 is housed within the housing 21. The electrode assembly 22 has a first electrode lead portion 221. The first electrode terminal 23 is disposed in the wall portion 213 and is electrically connected to the first electrode lead portion 221. The first insulating member 24 is configured to separate the first electrode terminal 23 from the wall portion 213. The connector 25 electrically connects the first electrode terminal 23 and the housing 21 . The minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode lead-out portion 221 .

[0169] The battery cell 20 refers to the smallest unit constituting the battery 100 .

[0170] The housing 21 includes an end cap 211 and a shell 212. The shell 212 has an accommodation space with one end open for accommodating the electrode assembly 22. The end cap 211 is connected to the shell 212 and closes the opening.

[0171] The end cap 211 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 211 can be adapted to the shape of the shell 212 to match the shell 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 211 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. The material of the end cap 211 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0172] The housing 212 is a component that cooperates with the end cap 211 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 22, electrolyte, and other components. The housing 212 and the end cap 211 can be separate components. An opening can be provided in the housing 212, and the end cap 211 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 211 and the housing 212 can be integrated. Specifically, the end cap 211 and the housing 212 can form a common joint surface before other components are inserted into the housing. When the interior of the housing 212 is to be enclosed, the end cap 211 is placed over the housing 212. The housing 212 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 212 can be determined based on the specific shape and size of the electrode assembly 22. The housing 212 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0173] The electrode assembly 22 is a component in the battery cell 20 where the electrochemical reaction occurs. One or more electrode assemblies 22 may be contained in the housing 21. The electrode assembly 22 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 22, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte.

[0174] The wall portion 213 may be the end cap 211 of the housing 21, or a wall of the shell 212 of the housing 21. In some implementations, as shown in Figures 3 and 4, the wall portion 213 is the end cap 211. In other embodiments, the wall portion 213 may be the bottom wall of the shell 212 opposite the end cap 211. In still other embodiments, the wall portion 213 may be a side wall of the shell 212 adjacent to and connected to the end cap 211.

[0175] The first electrode lead-out portion 221 is a structure for extracting electrical energy from the main body or introducing electrical energy into the main body. The first electrode lead-out portion 221 includes a first electrode tab 2211, which is the positive or negative electrode tab described above. The first electrode tab 2211 can be directly connected to the first electrode terminal 23. In other embodiments, the first electrode lead-out portion 221 may further include other electrical connection components connected to the first electrode tab 2211. For example, the first electrode lead-out portion 221 may further include a first current collecting member 2212, which connects the first electrode tab 2211 and the first electrode terminal 23 to conduct electrical energy from the electrode assembly 22 to the first electrode terminal 23 or receive electrical energy introduced from the first electrode terminal 23.

[0176] The first electrode tab 2211 can be a positive electrode tab or a negative electrode tab. When the first electrode tab 2211 is a positive electrode tab, the first electrode terminal 23 is a positive electrode terminal. When the first electrode tab 2211 is a negative electrode tab, the first electrode terminal 23 is a negative electrode terminal.

[0177] The first insulating member 24 is commonly known as the upper plastic. The first insulating member 24 is at least partially disposed between the first electrode terminal 23 and the wall portion 213. In the absence of the connector 25 connecting the first electrode terminal 23 and the wall portion 213, the first insulating member 24 can insulate and isolate the first electrode terminal 23 from the wall portion 213. For example, the first insulating member 24 may be plastic, rubber, or the like.

[0178] The connector 25 is a conductive component made of a conductive material and connects the first electrode terminal 23 and the outer shell 21 to allow current to be transferred to the outer shell 21 through the first electrode terminal 23 .

[0179] In embodiments where the first electrode lead portion 221 includes only the first electrode tab 2211, "the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode lead portion 221" means that the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode tab 2211. In embodiments where the first electrode lead portion 221 includes the first electrode tab 2211 and the first current collecting member 2212, "the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode lead portion 221" means that the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode tab 2211, and the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first current collecting member 2212. Thus, the connector 25 is configured to provide fuse protection for the electrode assembly 22. When the current passing through it is excessive, the connector 25 can fuse, thereby disconnecting the first electrode terminal 23 from the housing 21, thereby providing short-circuit protection or overload protection.

[0180] The minimum flow area of ​​the connector 25 refers to the minimum cross-sectional area of ​​the connector 25 for current to pass through on the flow path of the current flowing from the first electrode terminal 23 through the connector 25 to the outer shell 21 or from the outer shell 21 through the connector 25 to the first electrode terminal 23. That is, in the direction in which the current flows through the connector 25, the area of ​​the minimum cross section of the connector 25 perpendicular to the direction of current flow is the minimum flow area of ​​the connector 25.

[0181] Among them, the position of the minimum flow area of ​​the connector 25 can be determined by tomography, that is, the position of the minimum cross-section of the connector 25 perpendicular to the flow direction of the current can be determined by tomography, and the area of ​​the minimum cross-section of the connector 25 perpendicular to the flow direction of the current can be determined, that is, the minimum flow area of ​​the connector 25. In other words, the minimum flow area of ​​the connector 25 is also obtained by tomography.

[0182] The minimum flow area of ​​the first electrode lead-out portion 221 refers to the minimum cross-sectional area of ​​the first electrode lead-out portion 221 for current to pass through on the flow path of the current flowing from the main body through the first electrode lead-out portion 221 to the first electrode terminal 23 or from the first electrode terminal 23 through the first electrode lead-out portion 221 to the main body. That is, in the direction in which the current flows through the first electrode lead-out portion 221, the area of ​​the minimum cross-section of the first electrode lead-out portion 221 perpendicular to the direction of current flow is the minimum flow area of ​​the first electrode lead-out portion 221.

[0183] Among them, the position of the minimum flow area of ​​the first electrode lead-out portion 221 can be determined by tomography, that is, the position of the minimum cross-section of the first electrode lead-out portion 221 perpendicular to the flow direction of the current can be determined by tomography, and the area of ​​the minimum cross-section of the first electrode lead-out portion 221 perpendicular to the flow direction of the current can be determined, that is, the minimum flow area of ​​the first electrode lead-out portion 221. In other words, the minimum flow area of ​​the first electrode lead-out portion 211 is also obtained by tomography.

[0184] The minimum flow area of ​​the connecting member 25 is smaller than the minimum flow area of ​​the first electrode lead-out portion, that is, in the current flow path, the minimum cross-sectional area of ​​the connecting member 25 for current to pass through is smaller than the minimum cross-sectional area of ​​the first electrode lead-out portion 221 for current to pass through.

[0185] It should be noted that, on the current flow path, the area of ​​the minimum cross-section of the connector 25 for current to pass through is smaller than the area of ​​the minimum cross-section of the first electrode lead-out portion 221 for current to pass through. According to the resistance formula (R=ρL / S), the resistance of the connector 25 at the minimum flow area is greater than the resistance of the first electrode lead-out portion 221. In the event of a short circuit, according to the heat formula (Q=I2Rt), within the same time, the heat generated by the connector 25 at the minimum flow area is higher than that of the first electrode lead-out portion 221, and the heat accumulates faster than the first electrode lead-out portion 221. As a result, the connector 25 will be more likely to melt than the first electrode lead-out portion 221 in the event of a short circuit, so that when the battery cell 20 is short-circuited, the electrical connection between the first electrode terminal 23 and the shell 21 can be disconnected, thereby cutting off the short-circuit path and alleviating the further use risks caused by the short circuit of the battery cell 20.

[0186] The first electrode terminal 23 of the battery cell 20 is electrically connected to the outer casing 21 via a connector 25, enabling the outer casing 21 to output electrical energy from the electrode assembly 22. The battery management system 100 can be connected to the outer casing 21 of the battery cell 20, thereby enabling monitoring of the battery cell 20 and significantly reducing wiring complexity. Furthermore, the minimum flow area of ​​the connector 25 is smaller than that of the first electrode lead-out portion 221. The connector 25 has a fuse protection function. If a short circuit occurs in the battery cell 20, the connector 25 will automatically fuse, thereby protecting the electrode assembly 22, reducing the risk of fire or explosion in the battery cell 20, and improving the reliability of the battery cell 20.

[0187] Referring to Figures 3, 4, 5, 6, 7, and 8, in some embodiments, a mounting hole 2132 is provided on the wall portion 213. The first electrode terminal 23 includes a terminal body 232 and a first retaining portion 231. The terminal body 232 is at least partially accommodated in the mounting hole 2132. The first retaining portion 231 is provided at one end of the terminal body 232. The first retaining portion 231 is disposed opposite the wall portion 213 along the thickness direction of the wall portion 213. The connector 25 connects the first retaining portion 231 and the wall portion 213.

[0188] 4 , 5 , 7 and 8 , the thickness direction of the wall portion 213 is the X direction shown in the figures.

[0189] The mounting hole 2132 is a through hole provided in the wall portion 213. Along the thickness direction of the wall portion 213, the mounting hole 2132 penetrates two oppositely disposed surfaces of the wall portion 213.

[0190] The terminal body 232 is partially or completely accommodated in the mounting hole 2132, and the first stopper 231 is connected to one side of the terminal body 232. The first stopper 231 is arranged opposite to the wall portion 213 along the thickness direction of the wall portion 213. The first stopper 231 can prevent the terminal body 232 from escaping from the mounting hole 2132 in the direction from which the first stopper 231 points to the wall portion 213.

[0191] The first electrode lead-out portion 221 is electrically connected to the terminal body 232 . The connector 25 connects the first limiting portion 231 and the wall portion 213 , so that the first electrode lead-out portion 221 is electrically connected to the wall portion 213 .

[0192] The terminal body 232 is at least partially accommodated in the mounting hole 2132. The first stopper 231 is connected to one end of the terminal body 232 and is disposed opposite the wall portion 213 to prevent the terminal body 232 from escaping from the mounting hole 2132 in the direction from the first stopper 231 toward the wall portion 213. The connector 25 connects the first stopper 231 and the wall portion 213, thereby achieving electrical connection between the first electrode terminal 23 and the housing 21.

[0193] 3 , 4 , 5 , 6 , 7 and 8 , in some embodiments, along the thickness direction of the wall portion 213 , the connecting member 25 is located between the first limiting portion 231 and the wall portion 213 .

[0194] Along the thickness direction of the wall portion 213, the connecting member 25 may be partially located between the first limiting portion 231 and the wall portion 213, and partially located outside the first limiting portion 231 and the wall portion 213. Along the thickness direction of the wall portion 213, the connecting member 25 may also be completely located between the first limiting portion 231 and the wall portion 213.

[0195] By arranging the connector 25 between the first limiting portion 231 and the wall portion 213 , the risk of interference between the connector 25 and other components is reduced, so that the connector 25 can stably connect the first limiting portion 231 and the wall portion 213 , which is beneficial to improving the life of the battery cell 20 .

[0196] 3 , 4 , 5 , 6 , 7 and 8 , in some embodiments, along the thickness direction of the wall portion 213 , the first limiting portion 231 is disposed on a side of the wall portion 213 away from the electrode assembly 22 .

[0197] The first limiting portion 231 is provided along the thickness direction of the wall portion 213 on a side of the wall portion 213 facing away from the electrode assembly 22. At this time, the first limiting portion 231 is located outside the housing 21. Since the connecting member 25 is located between the wall portion 213 and the first limiting portion 231, the connecting member 25 is also located on a side of the wall portion 213 facing away from the electrode assembly 22.

[0198] By arranging the connector 25 on the side of the wall portion 213 away from the electrode assembly 22 , the connector 25 is less susceptible to the influence of the electrolyte, which is beneficial to improving the life of the connector 25 and thus increasing the number of cycles of the battery cell 20 .

[0199] 3 , 4 , 5 , 6 , 7 , and 8 , in some embodiments, the first insulating member 24 is provided with a first through hole 2411 that passes through the first insulating member 24 along the thickness direction of the wall portion 213 . The connecting member 25 is at least partially accommodated in the first through hole 2411 .

[0200] Along the thickness direction of the wall portion 213 , the first insulating member 24 is at least partially located between the first limiting portion 231 and the wall portion 213 . The first through hole 2411 is provided in the portion of the first insulating member 24 located between the first limiting portion 231 and the wall portion 213 .

[0201] Optionally, the first insulating member 24 includes a main body 241 and a covering portion 242. The covering portion 242 is disposed around the main body 241. Along the thickness direction of the wall 213, the main body 241 is located between the first limiting portion 231 and the wall 213, and the covering portion 242 covers the outer circumference of the first limiting portion 231. A first through hole 2411 is disposed in the main body 241. The first through hole 2411 penetrates two opposing surfaces of the main body 241 along the thickness direction of the wall 213.

[0202] The connecting member 25 may be partially accommodated in the first through hole 2411 , or the connecting member 25 may be completely accommodated in the first through hole 2411 .

[0203] Providing the first through hole 2411 in the first insulating member 24 facilitates the avoidance of the connector 25, thereby allowing the connector 25 to connect to the first limiting portion 231 and the wall portion 213. Furthermore, at least a portion of the connector 25 is accommodated within the first through hole 2411, which protects the connector 25 and further reduces the risk of interference between the connector 25 and other components. This allows the connector 25 to stably connect to the first limiting portion 231 and the wall portion 213, thereby improving the life of the battery cell 20.

[0204] Please refer to Figures 9, 10, 11, and 12. Figure 9 is an exploded view of the wall portion 213 and the first electrode terminal 23 provided in other embodiments of the present application. Figure 10 is a top view of the wall portion 213 provided in other embodiments of the present application. Figure 11 is a cross-sectional view of position CC in Figure 10. Figure 12 is an enlarged view of position D in Figure 11. In other embodiments, along the thickness direction of the wall portion 213, the first limit portion 231 is provided on the side of the wall portion 213 facing the electrode assembly 22.

[0205] The first limiting portion 231 is provided along the thickness direction of the wall portion 213 on a side of the wall portion 213 facing the electrode assembly 22. At this time, the first limiting portion 231 is located within the housing 21. Since the connecting member 25 is located between the wall portion 213 and the first limiting portion 231, the connecting member 25 is also located on the side of the wall portion 213 facing the electrode assembly 22.

[0206] By arranging the connector 25 on the side of the wall portion 213 facing the electrode assembly 22 , the connector 25 is less likely to interfere with other components, which is beneficial to improving the life of the battery cell 20 .

[0207] Referring to Figures 9, 10, 11, and 12, in some embodiments, the battery cell 20 includes a second insulating member 26. The second insulating member 26 is disposed on the side of the wall portion 213 facing the electrode assembly 22 along the thickness direction of the wall portion 213. The second insulating member 26 is configured to insulate and separate the wall portion 213 from the electrode assembly 22. The second insulating member 26 is provided with a second through hole 261 that extends through the second insulating member 26 along the thickness direction of the wall portion 213. The connector 25 is at least partially received in the second through hole 261.

[0208] The second insulating member 26 is commonly known as the lower plastic. The second insulating member 26 is disposed inside the wall portion 213 and is used to insulate and isolate the electrode assembly 22 from the wall portion 213 to reduce the risk of short circuit. For example, the second insulating member 26 can be plastic, rubber, etc.

[0209] Along the thickness direction of the wall portion 213, the second insulating member 26 is at least partially located between the first limiting portion 231 and the wall portion 213. The second through hole 261 is provided in the portion of the second insulating member 26 located between the first limiting portion 231 and the wall portion 213. The first through hole 2411 penetrates two opposing surfaces of the second insulating member 26 along the thickness direction of the wall portion 213.

[0210] The connecting member 25 may be partially accommodated in the second through hole 261 , or the connecting member 25 may be completely accommodated in the second through hole 261 .

[0211] The provision of a second insulating member 26 to insulate and isolate the wall portion 213 and the electrode assembly 22 reduces the risk of a short circuit caused by contact between the wall portion 213 and the electrode assembly 22. Providing a second through hole 261 in the second insulating member 26 facilitates the avoidance of the connector 25, thereby allowing the connector 25 to connect with the first limiting portion 231 and the wall portion 213. Furthermore, at least partially accommodating the connector 25 within the second through hole 261 protects the connector 25, further reducing the risk of interference between the connector 25 and other components, and making the connector 25 less susceptible to the effects of the electrolyte, thereby improving the life of the connector 25 and thereby increasing the number of cycles of the battery cell 20.

[0212] 9 , 10 , 11 and 12 , in some embodiments, the battery cell 20 further includes a seal 29 , which is sealed between the first electrode terminal 23 and the wall portion 213 to reduce the risk of electrolyte flowing out of the battery cell 20 .

[0213] Please refer to Figures 9, 10, 11, 12, and 13. Figure 13 is a schematic diagram of the structure of the connector 25 provided in some embodiments of the present application. In some embodiments, the connector 25 is an elastic element, and along the thickness direction of the wall portion 213, the two ends of the connector 25 respectively abut against the first limit portion 231 and the wall portion 213.

[0214] An elastic element is an element capable of elastic deformation. It can be a spring, a leaf spring, or the like. Connector 25 is an elastic element. Along the thickness of wall 213, its two ends abut against first stop 231 and wall 213, respectively. The elastic element exerts an elastic force on both first stop 231 and wall 213.

[0215] Because the connector 25 is an elastic element, it can apply an elastic force to the first limiting portion 231 and the wall portion 213, allowing the connector 25 to maintain stable contact with the first limiting portion 231 and the wall portion 213. This allows the connector 25 to maintain a stable connection between the first limiting portion 231 and the wall portion 213, which helps to improve the lifespan of the battery cell 20. In addition, during the manufacture of the battery cell 20, the electrical connection between the first limiting portion 231 and the wall portion 213 can be achieved simply by squeezing the connector 25 through the first limiting portion 231 and the wall portion 213, which is simple and convenient.

[0216] 9 , 10 , 11 , 12 and 13 , in some embodiments, the elastic element includes a spring.

[0217] Optionally, the elastic element is a coil spring. Along the thickness direction of the wall portion 213 , one end of the coil spring abuts against the first limiting portion 231 , and the other end of the coil spring abuts against the wall portion 213 .

[0218] Since the deformation direction of the spring is highly controllable and the cost is low, using the spring as the connecting member 25 can not only facilitate manufacturing but also reduce manufacturing costs.

[0219] Please refer to Figures 13 and 14. Figure 14 is a schematic diagram of the structure of the connector 25 (the third insulating member 254 covers the fuse portion 252) provided in some embodiments of the present application. In some embodiments, the spring includes a first connecting portion 251, a fuse portion 252, and a second connecting portion 253. The fuse portion 252 connects the first connecting portion 251 and the second connecting portion 253. The first connecting portion 251 and the second connecting portion 253 are respectively connected to the first limit portion 231 and the wall portion 213. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connecting portion 251, and the minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the second connecting portion 253.

[0220] The first connecting portion 251 is the portion of the connecting member 25 connected to the first electrode terminal 23 . Please refer to Figures 9 , 10 , 11 , 12 , 13 and 14 . In the embodiment shown in the figures, the first connecting portion 251 is connected to the first limiting portion 231 of the first electrode terminal 23 .

[0221] The fuse 252 is a component in the connector 25 that provides a fuse protection function. When the current passing through the fuse 252 is too large, it will melt, thereby disconnecting the first connection portion 251 and the second connection portion 253, thereby disconnecting the first electrode terminal 23 and the housing 21, providing short circuit protection or overload protection.

[0222] The second connection portion 253 is the portion of the connector 25 used for electrical connection to the housing 21 . Please refer to Figures 9 , 10 , 11 , 12 , 13 and 14 . In the embodiment shown in the figures, the second connection portion 253 is connected to the wall portion 213 of the housing 21 .

[0223] The minimum flow area of ​​the first connection portion 251 is the minimum cross-sectional area of ​​the first connection portion 251 perpendicular to its extension direction. The minimum flow area of ​​the fuse portion 252 is the minimum cross-sectional area of ​​the fuse portion 252 perpendicular to its extension direction. The minimum flow area of ​​the second connection portion 253 is the minimum cross-sectional area of ​​the second connection portion 253 perpendicular to its extension direction.

[0224] The first connection portion 251 is connected to the first limiting portion 231, the second connection portion 253 is connected to the wall portion 213, and the fuse portion 252 connects the first connection portion 251 and the second connection portion 253. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connection portion 251 and smaller than the minimum flow area of ​​the second connection portion 253. When the current passing through the fuse portion 252 is too large, the fuse portion 252 will automatically melt, disconnecting the first connection portion 251 and the second connection portion 253, thereby providing protection, reducing the risk of fire or explosion of the battery cell 20, and improving the reliability of the battery cell 20.

[0225] Please refer to Figures 15, 16, 17 and 18. Figure 15 is an exploded view of the wall portion 213 and the first electrode terminal 23 provided in some other embodiments of the present application. Figure 16 is a top schematic view of the wall portion 213 provided in some other embodiments of the present application. Figure 17 is a cross-sectional view of the EE position in Figure 16. Figure 18 is an enlarged view of the F position in Figure 17. In some other embodiments, the wall portion 213 is provided with a protrusion 2131, and the protrusion 2131 and the first limiting portion 231 are located on the same side of the wall portion 213 along the thickness direction of the wall portion 213. The connecting member 25 connects the protrusion 2131 and the first limiting portion 231.

[0226] The protrusion 2131 and the first limiting portion 231 are located on the same side of the wall portion 213 along the thickness direction of the wall portion 213. For example, when the first limiting portion 231 is located on the side of the wall portion 213 facing away from the electrode assembly 22 along the thickness direction of the wall portion 213, the protrusion 2131 protrudes from the side of the wall portion 213 facing away from the electrode assembly 22. For another example, when the first limiting portion 231 is located on the side of the wall portion 213 facing the electrode assembly 22 along the thickness direction of the wall portion 213, the protrusion 2131 protrudes from the side of the wall portion 213 facing the electrode assembly 22.

[0227] The connector 25 connects the protruding portion 2131 and the first limiting portion 231 to electrically connect the first electrode terminal 23 and the wall portion 213 .

[0228] By providing a protrusion 2131 on the wall portion 213, the protrusion 2131 and the first limiting portion 231 are located on the same side of the wall portion 213 along the thickness direction of the wall portion 213, thereby facilitating the connection portion to overlap the protrusion 2131 and the first limiting portion 231 to achieve electrical connection between the first electrode terminal 23 and the shell 21.

[0229] 15 , 16 , 17 and 18 , in some embodiments, the first limiting portion 231 is provided with a first slot 2311 , and the protruding portion 2131 is provided with a second slot 21311 . The connecting member 25 is secured in the first slot 2311 and the second slot 21311 .

[0230] The first slot 2311 is an open slot provided in the first limiting portion 231, and the second slot 21311 is an open slot provided in the protruding portion 2131. The opening of the first slot 2311 is opposite the opening of the second slot 21311. The connector 25 is provided in the first slot 2311 and the second slot 21311 to connect the protruding portion 2131 and the first limiting portion 231, thereby electrically connecting the first electrode terminal 23 and the wall portion 213.

[0231] By setting a first card slot 2311 on the first limiting portion 231 and a second card slot 21311 on the protruding portion 2131, the connecting member 25 can be clamped in the first card slot 2311 and the second card slot 21311, which facilitates rapid positioning of the connecting member 25 and electrically connects the connecting member 25 to the first limiting portion 231 and the protruding portion 2131, thereby simplifying installation.

[0232] Referring to Figures 15, 16, 17, and 18, in some embodiments, the protrusion 2131 has a first surface 21312 facing away from the wall portion 213, and the second engaging groove 21311 is recessed from the first surface 21312 toward the wall portion 213. Along the thickness direction of the wall portion 213, the connector 25 has a second surface 255 closest to the first surface 21312. The minimum distance between the first surface 21312 and the second surface 255 is A, satisfying the following: A ≥ 0.2 mm.

[0233] The first surface 21312 is a surface of the protruding portion 2131 facing away from the wall portion 213 , and the second locking groove 21311 is recessed from the first surface 21312 toward the wall portion 213 .

[0234] The second surface 255 is the surface of the connector 25 closest to the first surface 21312 along the thickness direction of the wall 213, that is, the surface of the connector 25 farthest from the wall 213. Referring to FIG. 18 , in the embodiment shown in FIG. 18 , the second surface 255 is the upper surface of the connector 25.

[0235] A represents the minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall portion 213. The minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall portion 213 is greater than or equal to 0.2 mm.

[0236] The minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall portion 213 can be: A = 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0237] The connector 25 is clamped in the second slot 21311, and the minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall portion 213 is greater than or equal to 0.2 mm. In this way, the second slot 21311 can better protect the connector 25, reduce the risk of damage to the connector 25, and improve the life of the battery cell 20.

[0238] Optionally, 0.5mm≤A≤1mm.

[0239] The minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall portion 213 can be: A = 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc.

[0240] By ensuring that the minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall portion 213 is greater than or equal to 0.5 mm, the connector 25 is positioned farther from the first surface 21312, allowing the connector 25 to be accommodated deeper within the second slot 21311. This allows the second slot 21311 to better protect the connector 25. By ensuring that the minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall portion 213 is less than or equal to 1 mm, the distance between the connector 25 and the first surface 21312 is minimized, and the protrusion 2131's height along the thickness direction of the wall portion 213 is minimized. This not only reduces the internal space occupied by the protrusion 2131 within the battery 100, but also reduces the risk of the protrusion 2131 interfering with other components. Therefore, when 0.5 mm ≤ A ≤ 1 mm, both protection of the connector 25 and reduced risk of the protrusion 2131 interfering with other components are achieved.

[0241] Please refer to Figures 15, 16, 17 and 18. In some embodiments, the first insulating member 24 includes a main body portion 241 and a covering portion 242. The covering portion 242 is arranged around the main body portion 241. Along the thickness direction of the wall portion 213, the main body portion 241 is located between the first limiting portion 231 and the wall portion 213, and the covering portion 242 is covered on the outer peripheral surface of the first limiting portion 231; a third card slot 2421 is provided on the covering portion 242, and the connecting member 25 is clamped in the third card slot 2421.

[0242] The main body 241 is the portion of the first insulating member 24 located between the first limiting portion 231 and the wall portion 213 along the thickness direction of the wall portion 213. The main body 241 separates the first limiting portion 231 and the wall portion 213. In the absence of the connector 25 connecting the first electrode terminal 23 and the wall portion 213, the main body 241 can insulate and isolate the first electrode terminal 23 from the wall portion 213.

[0243] The covering portion 242 is the portion of the first insulating member 24 that covers the outer circumference of the first limiting portion 231. In the absence of the connector 25 connecting the first electrode terminal 23 and the wall portion 213, the covering portion 242 covers the outer circumference of the first limiting portion 231, further improving the insulation isolation between the first electrode terminal 23 and the wall portion 213.

[0244] The third engaging slot 2421 is an open slot provided in the covering portion 242 , and the connecting member 25 is engaged with the first engaging slot 2311 , the second engaging slot 21311 and the third engaging slot 2421 .

[0245] The main body 241 is positioned between the first limiting portion 231 and the wall portion 213, and the covering portion 242 covers the outer circumference of the first limiting portion 231, thereby better separating the first limiting portion 231 from the wall portion 213 and reducing the risk of direct contact between the first limiting portion 231 and the wall portion 213. A third retaining groove 2421 is provided on the covering portion 242 to avoid the connector 25, facilitating its retention in the first retaining groove 2311 and the second retaining groove 21311. By retaining the connector 25 in the first retaining groove 2311, the second retaining groove 21311, and the third retaining groove 2421, the connector 25 can be quickly positioned and electrically connected to the first limiting portion 231 and the protruding portion 2131, simplifying installation.

[0246] 15, 16, 17, and 18, in some embodiments, along the thickness direction of the wall portion 213, the connector 25 has a third surface 256 closest to the bottom surface of the third slot 2421. The minimum distance between the third surface 256 and the bottom surface of the third slot 2421 is B, satisfying the following condition: B ≥ 0.2 mm.

[0247] The third surface 256 is the surface of the connector 25 closest to the bottom of the third slot 2421 along the thickness direction of the wall portion 213. Referring to FIG18, in the embodiment shown in FIG18, the third surface 256 is the bottom surface of the connector 25.

[0248] B represents the minimum distance between the third surface 256 and the bottom of the third slot 2421 along the thickness direction of the wall portion 213. The minimum distance between the third surface 256 and the bottom of the third slot 2421 along the thickness direction of the wall portion 213 is greater than or equal to 0.2 mm.

[0249] The minimum distance between the third surface 256 and the bottom surface of the third slot 2421 along the thickness direction of the wall portion 213 can be: B = 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0250] By ensuring that the minimum distance between the surface of the connector 25 closest to the bottom of the third slot 2421 and the bottom of the third slot 2421 is greater than or equal to 0.2 mm, the connector 25 is farther away from the bottom of the third slot 2421, thereby reducing the risk of interference between the first insulating member 24 and the connector 25 when the first insulating member 24 moves, which is beneficial to improving the life of the connector 25 and thereby increasing the number of cycles of the battery cell 20.

[0251] Optionally, 0.5mm≤B≤1mm.

[0252] The minimum distance between the third surface 256 and the bottom surface of the third slot 2421 along the thickness direction of the wall portion 213 can be: B = 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc.

[0253] By ensuring that the minimum distance between the third surface 256 and the bottom of the third slot 2421 along the thickness direction of the wall portion 213 is greater than or equal to 0.5 mm, the connector 25 is kept at a greater distance from the bottom of the third slot 2421. This prevents the connector 25 from colliding with the first insulating member 24 when it moves, thus minimizing damage to the connector 25. By ensuring that the minimum distance between the third surface 256 and the bottom of the third slot 2421 along the thickness direction of the wall portion 213 is less than or equal to 1 mm, the distance between the connector 25 and the bottom of the third slot 2421 is not excessive, allowing the covering portion 242 to still effectively separate the connector 25. Therefore, when 0.5 mm ≤ B ≤ 1 mm, both protection of the connector 25 and the covering effect of the covering portion 242 are achieved.

[0254] Please refer to Figures 17, 18, 19, and 20. Figure 19 is a schematic diagram of the structure of a connector 25 provided in some further embodiments of the present application. Figure 20 is a schematic diagram of the structure of a connector 25 (with a third insulating member 254 covering a fuse portion 252) provided in some further embodiments of the present application. In some further embodiments, the connector 25 is a strip-shaped structure extending along a first direction, where the first direction intersects the thickness direction of the wall portion 213.

[0255] The connector 25 is a strip-shaped structure extending along a first direction. In other words, the length of the connector 25 is the first direction. Referring to Figures 17, 18, 19, and 20, the first direction may be the Y direction shown in the figures. The angle between the first direction and the thickness direction of the wall portion 213 may be an acute angle or a right angle. Referring to Figures 17 and 18, in the embodiment shown in the figures, the first direction is perpendicular to the thickness direction of the wall portion 213.

[0256] By configuring the connector 25 as a strip-shaped structure extending along the first direction, the connector portion can be easily overlapped with the protruding portion 2131 and the first limiting portion 231, thereby achieving electrical connection between the first electrode terminal 23 and the housing 21. In addition, in the embodiment where the connector 25 is disposed in the first and second slots 2311, 21311, the connector 25 can be more conveniently engaged with the first and second slots 2311, 21311.

[0257] Referring to Figures 17, 18, 19, and 20, in some embodiments, the connector 25 includes a first connecting portion 251, a fuse portion 252, and a second connecting portion 253 arranged along a first direction. The fuse portion 252 connects the first connecting portion 251 and the second connecting portion 253. The first connecting portion 251 and the second connecting portion 253 are respectively connected to the first limiting portion 231 and the protruding portion 2131. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connecting portion 251, and the minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the second connecting portion 253.

[0258] The first connecting portion 251 is the portion of the connecting member 25 connected to the first electrode terminal 23 . Referring to FIG. 17 and FIG. 18 , in the embodiment shown in the figures, the first connecting portion 251 is connected to the first limiting portion 231 of the first electrode terminal 23 .

[0259] The fuse 252 is a component in the connector 25 that provides a fuse protection function. When the current passing through the fuse 252 is too large, it will melt, thereby disconnecting the first connection portion 251 and the second connection portion 253, thereby disconnecting the first electrode terminal 23 and the housing 21, providing short circuit protection or overload protection.

[0260] The second connecting portion 253 is a portion of the connecting member 25 for electrically connecting to the housing 21 . Referring to FIG. 17 and FIG. 18 , in the embodiment shown in the figures, the second connecting portion 253 is connected to the protrusion 2131 on the wall portion 213 .

[0261] The first connection portion 251 , the fuse portion 252 and the second connection portion 253 are arranged along the first direction to form a strip structure.

[0262] The first connection portion 251 is connected to the first limiting portion 231, the second connection portion 253 is connected to the protrusion 2131, and the fuse portion 252 connects the first connection portion 251 and the second connection portion 253. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connection portion 251 and smaller than the minimum flow area of ​​the second connection portion 253. When the current passing through the fuse portion 252 is too large, the fuse portion 252 will automatically melt, disconnecting the first connection portion 251 and the second connection portion 253, thereby providing protection, reducing the risk of fire or explosion of the battery cell 20, and improving the reliability of the battery cell 20.

[0263] In some embodiments, the battery cell 20 includes a plurality of connectors 25 , and the plurality of connectors 25 are spaced apart and distributed along the circumference of the terminal body 232 .

[0264] The battery cell 20 may include two connectors 25 , three connectors 25 , four connectors 25 , or more than four connectors 25 . The multiple connectors 25 are distributed around the terminal body 232 .

[0265] By providing multiple connectors 25 , the current capacity can be increased, allowing the battery cell 20 to output a larger current. By distributing the multiple connectors 25 at intervals along the circumference of the terminal body 232 , the force around the terminal body 232 is made more uniform.

[0266] Please refer to Figures 21, 22, 23 and 24. Figure 21 is an exploded view of the wall portion 213 and the first electrode terminal 23 provided in some further embodiments of the present application. Figure 22 is a top schematic view of the wall portion 213 provided in some further embodiments of the present application. Figure 23 is a cross-sectional view of the GG position in Figure 22. Figure 24 is an enlarged view of the H position in Figure 23. In some further embodiments, a mounting hole 2132 is provided on the wall portion 213, and the first electrode terminal 23 includes a terminal body 232 and a first limiting portion 231, and the terminal body 232 is at least partially accommodated in the mounting hole 2132. The first limiting portion 231 is provided at one end of the terminal body 232, and is arranged opposite to the wall portion 213 along the thickness direction of the wall portion 213. The connecting member 25 connects the wall portion 213 and the terminal body 232.

[0267] The first electrode lead portion 221 is electrically connected to the terminal body 232 , and the connector 25 connects the terminal body 232 and the wall portion 213 , so that the first electrode lead portion 221 is electrically connected to the wall portion 213 .

[0268] The terminal body 232 is at least partially accommodated in the mounting hole 2132. The first stopper 231 is connected to one end of the terminal body 232 and is disposed opposite the wall portion 213 to prevent the terminal body 232 from escaping from the mounting hole 2132 in the direction from the first stopper 231 toward the wall portion 213. The connector 25 connects the terminal body 232 and the wall portion 213, thereby achieving electrical connection between the first electrode terminal 23 and the housing 21.

[0269] 21 , 22 , 23 and 24 , in some embodiments, along the thickness direction of the wall portion 213 , the first limiting portion 231 is disposed on a side of the wall portion 213 away from the electrode assembly 22 .

[0270] The first limiting portion 231 is disposed along the thickness direction of the wall portion 213 on a side of the wall portion 213 away from the electrode assembly 22 , that is, the first limiting portion 231 is located outside the housing 21 .

[0271] The first limiting portion 231 is disposed on a side of the wall portion 213 away from the electrode assembly 22 , and can prevent the terminal body 232 from escaping from the mounting hole 2132 along the wall portion 213 toward the electrode assembly 22 .

[0272] 21, 22, 23, and 24, in some embodiments, along the thickness direction of the wall portion 213, the connector 25 is located on a side of the wall portion 213 facing away from the electrode assembly 22. A first retaining groove 243 is defined on a side of the first insulating member 24 facing the wall portion 213, and the connector 25 is received in the first retaining groove 243.

[0273] Along the thickness direction of the wall portion 213 , the connector 25 and the first limiting portion 231 are both located on a side of the wall portion 213 away from the electrode assembly 22 , and a portion of the connector 25 is located between the first limiting portion 231 and the wall portion 213 .

[0274] The first limiting groove 243 is a groove structure provided in the first insulating member 24. The first limiting groove 243 is recessed from the side of the first insulating member 24 facing the wall portion 213 toward the side of the first insulating member 24 facing away from the wall portion 213. The first limiting groove 243 may penetrate the first insulating member 24 along the thickness direction of the wall portion 213, or may not penetrate the first insulating member 24.

[0275] The size and shape of the first limiting groove 243 match those of the connecting member 25 , so that the connecting member 25 is limited in the first limiting groove 243 .

[0276] By setting a first limiting groove 243 on the first insulating member 24 and accommodating the connecting member 25 in the first limiting groove 243, not only can the connecting member 25 be limited so that the connecting member 25 can stably connect the terminal body 232 and the wall portion 213, but the connecting member 25 can also be protected.

[0277] In some other embodiments, along the thickness direction of the wall portion 213 , the first limiting portion 231 is disposed on a side of the wall portion 213 facing the electrode assembly 22 .

[0278] The first limiting portion 231 is disposed along the thickness direction of the wall portion 213 on a side of the wall portion 213 facing the electrode assembly 22 , that is, the first limiting portion 231 is located on the inner side of the housing 21 .

[0279] The first limiting portion 231 is disposed on a side of the wall portion 213 facing the electrode assembly 22 , and can prevent the terminal body 232 from escaping from the mounting hole 2132 along the direction of the wall portion 213 away from the electrode assembly 22 .

[0280] Optionally, the battery cell 20 includes a second insulating member 26, which is disposed along the thickness direction of the wall portion 213 on the side of the wall portion 213 facing the electrode assembly 22. The second insulating member 26 is configured to insulate and separate the wall portion 213 and the electrode assembly 22. The connector 25 is located on the side of the wall portion 213 facing the electrode assembly 22. The second insulating member 26 has a second retaining groove on the side facing the wall portion 213, and the connector 25 is accommodated in the second retaining groove.

[0281] The second insulating member 26 is commonly known as the lower plastic. The second insulating member 26 is disposed inside the wall portion 213 and is used to insulate and isolate the electrode assembly 22 from the wall portion 213 to reduce the risk of short circuit. For example, the second insulating member 26 can be plastic, rubber, etc.

[0282] Along the thickness direction of the wall portion 213 , the connector 25 and the first limiting portion 231 are both located on the side of the wall portion 213 facing the electrode assembly 22 , and a portion of the connector 25 is located between the first limiting portion 231 and the wall portion 213 .

[0283] The second limiting groove is a groove structure provided on the second insulating member 26. The second limiting groove is recessed from the side of the second insulating member 26 facing the wall portion 213 toward the side of the second insulating member 26 facing away from the wall portion 213. The second limiting groove may penetrate the second insulating member 26 along the thickness direction of the wall portion 213, or may not penetrate the second insulating member 26.

[0284] The size and shape of the second limiting groove match the size and shape of the connecting member 25 so as to limit the connecting member 25 in the second limiting groove.

[0285] The second insulating member 26 is provided to insulate and isolate the wall portion 213 and the electrode assembly 22, thereby reducing the risk of a short circuit caused by contact between the wall portion 213 and the electrode assembly 22. The second limiting groove is provided on the second insulating member 26, and the connector 25 is accommodated in the second limiting groove. This not only limits the connector 25, allowing it to stably connect the terminal body 232 and the wall portion 213, but also protects the connector 25, reducing the risk of interference between the connector 25 and other components, and making the connector 25 less susceptible to the effects of the electrolyte, thereby improving the life of the connector 25 and thereby increasing the number of cycles of the battery cell 20.

[0286] 21, 22, 23, 24, and 25, in some embodiments, the connector 25 includes a first connecting portion 251, a fuse portion 252, and a second connecting portion 253. The fuse portion 252 connects the first connecting portion 251 and the second connecting portion 253. The first connecting portion 251 and the second connecting portion 253 are respectively connected to the terminal body 232 and the wall portion 213. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connecting portion 251, and the minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the second connecting portion 253.

[0287] The first connection portion 251 is the portion of the connector 25 connected to the first electrode terminal 23 . Please refer to Figures 21 , 22 , 23 and 24 . In the embodiment shown in the figures, the first connection portion 251 is connected to the terminal body 232 of the first electrode terminal 23 .

[0288] The fuse 252 is a component in the connector 25 that provides a fuse protection function. When the current passing through the fuse 252 is too large, it will melt, thereby disconnecting the first connection portion 251 and the second connection portion 253, thereby disconnecting the first electrode terminal 23 and the housing 21, providing short circuit protection or overload protection.

[0289] The second connection portion 253 is a portion of the connector 25 for electrical connection to the housing 21 . Please refer to Figures 21 , 22 , 23 and 24 . In the embodiment shown in the figures, the second connection portion 253 is connected to the wall portion 213 of the housing 21 .

[0290] The first connection portion 251 is connected to the terminal body 232, the second connection portion 253 is connected to the wall portion 213, and the fuse portion 252 connects the first connection portion 251 and the second connection portion 253. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connection portion 251 and smaller than the minimum flow area of ​​the second connection portion 253. When the current passing through the fuse portion 252 is too large, the fuse portion 252 will automatically melt, disconnecting the first connection portion 251 and the second connection portion 253, thereby providing protection, reducing the risk of fire or explosion of the battery cell 20, and improving the reliability of the battery cell 20.

[0291] 21, 22, 23, 24, and 25, in some embodiments, the first connection portion 251 and the second connection portion 253 are both annular, and the first connection portion 251 is located inside the second connection portion 253. The first connection portion 251 has a central hole 2511, and the terminal body 232 is inserted into the central hole 2511.

[0292] The first connecting portion 251 and the second connecting portion 253 are both annular structures. The second connecting portion 253 is located outside the first connecting portion 251 , that is, the inner diameter of the second connecting portion 253 is larger than the outer diameter of the first connecting portion 251 .

[0293] The first connecting portion 251 has a central hole 2511 , and the axis of the central hole 2511 coincides with the central axis of the second connecting portion 253 . The first connecting portion 251 is sleeved onto the outside of the terminal body 232 through the central hole 2511 .

[0294] By making the first connection portion 251 and the second connection portion 253 both annular, it is convenient to connect the first connection portion 251 to the terminal body 232 and the second connection portion 253 to the wall portion 213 , and the force around the terminal body 232 is uniform.

[0295] 21 , 22 , 23 , 24 and 25 , in some embodiments, the connector 25 includes a plurality of fuse portions 252 , which are spaced apart along the circumference of the first connector 251 .

[0296] The connector 25 may include two fuse parts 252 , three fuse parts 252 , four fuse parts 252 , or more than four fuse parts 252 .

[0297] A plurality of fuse portions 252 are arranged at intervals along the circumferential direction of the first connection portion 251 , and each fuse portion 252 connects an outer circumferential surface of the first connection portion 251 and an inner circumferential surface of the second connection portion 253 .

[0298] By providing multiple fuses 252, the current capacity can be increased, allowing the battery cell 20 to output a larger current. By distributing multiple fuses 252 at intervals along the circumference of the first connecting portion 251, the force applied to the first connecting portion 251 and the second connecting portion 253 is more uniform.

[0299] 23 and 24 , in some embodiments, the electrode terminal further includes a second limiting portion 233. The second limiting portion 233 and the first limiting portion 231 are respectively located on either side of the wall portion 213. The second limiting portion 233 and the first limiting portion 231 cooperate to limit the terminal body 232 from being separated from the mounting hole 2132.

[0300] The first and second limiting portions 231, 233 are respectively connected to the ends of the terminal body 232. The first and second limiting portions 231, 233 are disposed opposite each other along the thickness direction of the wall portion 213 and are located on either side of the wall portion 213. The first and second limiting portions 231, 233 cooperate to prevent the terminal body 232 from being disengaged from the mounting hole 2132.

[0301] By providing the first limiting portion 231 and the second limiting portion 233, the first limiting portion 231 and the second limiting portion 233 cooperate to limit the terminal body 232 from being separated from the mounting hole 2132, thereby reducing the risk of the first electrode terminal 23 being separated from the wall portion 213 and extending the life of the battery cell 20. In addition, the first limiting portion 231, the terminal body 232, and the second limiting portion 233 can be formed by riveting, which is simple and convenient to manufacture and has high reliability.

[0302] In some embodiments, the connector 25 includes a first connector 251, a fuse 252, and a second connector 253. The fuse 252 connects the first connector 251 and the second connector 253. The first connector 251 and the second connector 253 are respectively connected to the first electrode terminal 23 and the housing 21. The minimum flow area of ​​the fuse 252 is smaller than the minimum flow area of ​​the first connector 251, and the minimum flow area of ​​the fuse 252 is smaller than the minimum flow area of ​​the second connector 253.

[0303] The first connection portion 251 is the portion of the connector 25 that connects to the first electrode terminal 23. The fuse portion 252 is a component of the connector 25 that provides fuse protection. The second connection portion 253 is the portion of the connector 25 that is electrically connected to the outer shell 21. The fuse portion 252 can melt when an excessive current flows through it, thereby disconnecting the first connection portion 251 and the second connection portion 253, thereby separating the first electrode terminal 23 and the outer shell 21, providing short-circuit protection or overload protection.

[0304] The minimum flow area of ​​the first connection portion 251 is the minimum cross-sectional area of ​​the first connection portion 251 perpendicular to its extension direction. The minimum flow area of ​​the fuse portion 252 is the minimum cross-sectional area of ​​the fuse portion 252 perpendicular to its extension direction. The minimum flow area of ​​the second connection portion 253 is the minimum cross-sectional area of ​​the second connection portion 253 perpendicular to its extension direction. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connection portion 251 and smaller than the minimum flow area of ​​the second connection portion 253, so that it can be melted in a timely manner when a short circuit occurs in the battery cell 20.

[0305] The first connection portion 251 is connected to the first electrode terminal 23, the second connection portion 253 is connected to the outer casing 21, and the fuse portion 252 connects the first connection portion 251 and the second connection portion 253. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connection portion 251 and smaller than the minimum flow area of ​​the second connection portion 253. When the current passing through the fuse portion 252 is too large, the fuse portion 252 will automatically melt, disconnecting the first connection portion 251 and the second connection portion 253, thereby providing protection, reducing the risk of fire or explosion of the battery cell 20, and improving the reliability of the battery cell 20.

[0306] In some embodiments, the battery cell 20 includes a third insulating member 254 , and the third insulating member 254 covers the fuse portion 252 .

[0307] The third insulating member 254 covers the fuse portion 252 to protect the fuse portion 252. For example, the third insulating member 254 can be made of plastic, rubber, etc.

[0308] The third insulating member 254 is provided to cover the fuse portion 252 , thereby protecting the fuse portion 252 , reducing the risk of damage to the fuse portion 252 , extending the life of the connector 25 , and facilitating an increase in the number of cycles of the battery cell 20 .

[0309] In some embodiments, the minimum flow area of ​​the fuse 252 is S, which satisfies: 2mm 2 ≤S≤20mm 2 .

[0310] S represents the minimum flow area of ​​the fuse portion 252 , that is, the minimum cross-sectional area of ​​the fuse portion 252 perpendicular to its extending direction.

[0311] The minimum flow area of ​​the fuse 252 can be: S = 2mm 2 , 4mm 2 , 6mm 2 , 8mm 2 , 10mm 2 , 12mm 2 , 14mm 2 , 16mm 2 , 18mm 2 , 20mm 2 wait.

[0312] When S≥2mm 2 When S≤20mm, the fuse part 252 has a larger flow area, so that the battery cell 20 can output a larger current. 2 When the flow area of ​​the fuse part 252 is not too large, the fuse part 252 can be melted in time when the battery cell 20 is short-circuited, thus playing a protective role. 2 ≤S≤20mm 2 When the battery cell 20 is short-circuited, the battery cell 20 can be blown off in time.

[0313] In some embodiments, the length of the fuse portion 252 is L, which satisfies: 0.3 mm ≤ L ≤ 5 mm.

[0314] L represents the length of the fuse portion 252 along its extending direction. The length of the fuse portion 252 can be: L=0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0315] When L ≥ 0.3 mm, the fuse 252 has a longer length and higher resistance. When the battery cell 20 short-circuits, it can generate a large amount of heat, causing the fuse 252 to melt in time. When L ≤ 5 mm, the fuse 252 is not too long and its resistance is not too high, allowing the battery cell 20 to output a larger current. Therefore, when 0.3 mm ≤ L ≤ 5 mm, the battery cell 20 can both output a larger current and melt in time when a short circuit occurs.

[0316] In some embodiments, the connector 25 electrically connects the first electrode terminal 23 and the wall portion 213 .

[0317] By electrically connecting the first electrode terminal 23 and the wall portion 213 through the connector 25, the wall portion 213 can output the electrical energy of the electrode assembly 22. The battery 100 management system can be connected to the wall portion 213, thereby enabling monitoring of the battery cell 20 and greatly reducing wiring difficulty.

[0318] In other embodiments, the connector 25 electrically connects the first electrode terminal 23 and other walls of the housing 21 except the wall portion 213 .

[0319] 21, 22, 23, and 24, in some embodiments, the battery cell 20 further includes a second electrode terminal 27, which is insulated and mounted on the wall portion 213. The electrode assembly 22 further includes a second electrode lead portion 222, and the second electrode terminal 27 is electrically connected to the second electrode lead portion 222.

[0320] The second electrode lead-out portion 222 is a structure for extracting electrical energy from the main body or introducing electrical energy into the main body. The second electrode lead-out portion 222 includes a second electrode tab 2221, which is the negative electrode tab or the positive electrode tab described above. The second electrode tab 2221 can be directly connected to the second electrode terminal 27. In other embodiments, the second electrode lead-out portion 222 may further include other electrical connection components connected to the second electrode tab 2221. For example, the second electrode lead-out portion 222 may further include a second current collecting member 2222, which connects the second electrode tab 2221 to the second electrode terminal 27 to conduct electrical energy from the electrode assembly 22 to the second electrode terminal 27 or receive electrical energy introduced from the second electrode terminal 27.

[0321] The polarity of the first electrode tab 2211 and the second electrode tab 2221 is opposite. For example, when the first electrode tab 2211 is a positive electrode tab, the second electrode tab 2221 is a negative electrode tab. When the first electrode tab 2211 is a negative electrode tab, the second electrode tab 2221 is a positive electrode tab. Similarly, the polarity of the first electrode terminal 23 and the second electrode terminal 27 is opposite. For example, when the first electrode terminal 23 is a positive electrode terminal, the second electrode terminal 27 is a negative electrode terminal. When the first electrode terminal 23 is a negative electrode terminal, the second electrode terminal 27 is a positive electrode terminal.

[0322] The second electrode terminal 27 is insulated and mounted on the wall portion 213, that is, the second electrode terminal 27 is insulated and isolated from the wall portion 213. Optionally, the battery cell 20 includes a fourth insulating member 28, which is disposed between the second electrode terminal 27 and the wall portion 213 to insulate and isolate the second electrode terminal 27 from the wall portion 213.

[0323] The outer shell 21 can be electrically connected to the first electrode lead portion 221, and the second electrode terminal 27 can be electrically connected to the second electrode lead portion 222. The outer shell 21 can serve as the positive or negative electrode of the battery cell 20, and the second electrode terminal 27 can serve as the negative or positive electrode of the battery cell 20 to output electrical energy from the battery cell 20. When both the first electrode lead portion 221 and the second electrode lead portion 222 are electrically connected to the outer shell 21, the battery cell 20 short-circuits, and the connector 25 can self-fuse, disconnecting the first electrode lead portion 221 from the outer shell 21. This protects the electrode assembly 22, reduces the risk of fire or explosion in the battery cell 20, and helps improve the reliability of the battery cell 20.

[0324] Optionally, the second electrode terminal 27 includes a rivet portion 272 and a limiting portion 271 , the rivet portion 272 is connected to the second electrode lead portion 222 , the rivet portion 272 is passed through the wall portion 213 , and the limiting portion 271 is connected to one end of the rivet portion 272 , that is, the second electrode terminal 27 is riveted to the wall portion 213 .

[0325] In some embodiments, the first electrode terminal 23 is a positive electrode terminal.

[0326] The first electrode terminal 23 is electrically connected to the outer shell 21 through the connector 25 . The first electrode terminal 23 is a positive electrode terminal, which prevents the outer shell 21 from being corroded.

[0327] The embodiment of the present application further provides a battery 100 , which includes the above-mentioned battery cell 20 .

[0328] An embodiment of the present application further provides an electrical device, which includes the above-mentioned battery cell 20.

[0329] According to some embodiments of the present application, please refer to Figures 3 to 25.

[0330] An embodiment of the present application provides a battery cell 20, comprising a housing 21, an electrode assembly 22, a first electrode terminal 23, a first insulating member 24, and a connector 25. The housing 21 has a wall 213, and the electrode assembly 22 is housed within the housing 21. The electrode assembly 22 has a first electrode lead-out portion 221, with the first electrode terminal 23 disposed in the wall 213 and electrically connected to the first electrode lead-out portion 221. The first insulating member 24 is configured to separate the first electrode terminal 23 from the wall 213. The connector 25 electrically connects the first electrode terminal 23 to the housing 21, and the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode lead-out portion 221. The first electrode terminal 23 of the battery cell 20 is electrically connected to the housing 21 via the connector 25, enabling the housing 21 to output electrical energy from the electrode assembly 22. The battery management system 100 can be connected to the housing 21 of the battery cell 20, thereby enabling monitoring of the battery cell 20 and significantly reducing wiring complexity. In addition, the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode lead-out portion 221. The connector 25 has a fuse protection function. When a short circuit occurs in the battery cell 20, the connector 25 can fuse itself, thereby protecting the electrode assembly 22 and reducing the risk of fire and explosion of the battery cell 20, which is beneficial to improving the reliability of the battery cell 20.

[0331] The wall portion 213 is provided with a mounting hole 2132. The first electrode terminal 23 includes a terminal body 232 and a first retaining portion 231. The terminal body 232 is at least partially accommodated in the mounting hole 2132. The first retaining portion 231 is disposed at one end of the terminal body 232. The first retaining portion 231 is disposed opposite the wall portion 213 along the thickness direction of the wall portion 213. A connector 25 connects the first retaining portion 231 and the wall portion 213. The terminal body 232 is at least partially accommodated in the mounting hole 2132. The first retaining portion 231 is connected to one end of the terminal body 232 and is disposed opposite the wall portion 213 to prevent the terminal body 232 from disengaging from the mounting hole 2132 in the direction from the first retaining portion 231 toward the wall portion 213. The connector 25 connects the first retaining portion 231 and the wall portion 213, thereby achieving electrical connection between the first electrode terminal 23 and the housing 21.

[0332] In some embodiments, the connector 25 is positioned between the first stopper 231 and the wall 213 along the thickness of the wall 213. The first stopper 231 is disposed on the side of the wall 213 facing away from the electrode assembly 22. The first insulating member 24 is provided with a first through-hole 2411, which extends through the first insulating member 24 along the thickness of the wall 213. The connector 25 is at least partially accommodated within the first through-hole 2411. Providing the first through-hole 2411 in the first insulating member 24 facilitates the avoidance of the connector 25, thereby allowing the connector 25 to connect to the first stopper 231 and the wall 213. Furthermore, at least partially accommodating the connector 25 within the first through-hole 2411 protects the connector 25, further reducing the risk of interference between the connector 25 and other components. This ensures a stable connection between the connector 25 and the first stopper 231 and the wall 213, thereby improving the lifespan of the battery cell 20.

[0333] In other embodiments, the connector 25 is located between the first limiting portion 231 and the wall portion 213 along the thickness direction of the wall portion 213. Along the thickness direction of the wall portion 213, the first limiting portion 231 is provided on the side of the wall portion 213 facing the electrode assembly 22. The battery cell 20 includes a second insulating member 26. Along the thickness direction of the wall portion 213, the second insulating member 26 is provided on the side of the wall portion 213 facing the electrode assembly 22. The second insulating member 26 is configured to insulate and separate the wall portion 213 and the electrode assembly 22. A second through-hole 261 is provided on the second insulating member 26. The second through-hole 261 penetrates the second insulating member 26 along the thickness direction of the wall portion 213. The connector 25 is at least partially accommodated in the second through-hole 261. By providing the second insulating member 26 to insulate and separate the wall portion 213 and the electrode assembly 22, the risk of a short circuit caused by contact between the wall portion 213 and the electrode assembly 22 is reduced. Providing the second through hole 261 on the second insulating member 26 facilitates the avoidance of the connector 25, thereby allowing the connector 25 to connect to the first limiting portion 231 and the wall portion 213. Furthermore, at least a portion of the connector 25 is accommodated within the second through hole 261, which protects the connector 25, further reducing the risk of interference between the connector 25 and other components, and making the connector 25 less susceptible to the effects of the electrolyte, thereby increasing the life of the connector 25 and the number of cycles of the battery cell 20.

[0334] In some other embodiments, the wall portion 213 is provided with a protrusion 2131, and the protrusion 2131 and the first limiting portion 231 are located on the same side of the wall portion 213 along the thickness direction of the wall portion 213. The connector 25 connects the protrusion 2131 and the first limiting portion 231. By providing the protrusion 2131 on the wall portion 213, the protrusion 2131 and the first limiting portion 231 are located on the same side of the wall portion 213 along the thickness direction of the wall portion 213, thereby facilitating the connector to overlap the protrusion 2131 and the first limiting portion 231, thereby achieving electrical connection between the first electrode terminal 23 and the housing 21.

[0335] In some other embodiments, a mounting hole 2132 is provided in the wall portion 213. The first electrode terminal 23 includes a terminal body 232 and a first retaining portion 231. The terminal body 232 is at least partially accommodated in the mounting hole 2132. The first retaining portion 231 is disposed at one end of the terminal body 232. The first retaining portion 231 is disposed opposite the wall portion 213 along the thickness direction of the wall portion 213. A connector 25 connects the wall portion 213 and the terminal body 232. The first retaining portion 231 is disposed on a side of the wall portion 213 facing away from the electrode assembly 22 along the thickness direction of the wall portion 213. The connector 25 is located on a side of the wall portion 213 facing away from the electrode assembly 22 along the thickness direction of the wall portion 213. A first retaining groove 243 is defined on the side of the first insulating member 24 facing the wall portion 213. The connector 25 is accommodated in the first retaining groove 243. By setting a first limiting groove 243 on the first insulating member 24 and accommodating the connecting member 25 in the first limiting groove 243, not only can the connecting member 25 be limited so that the connecting member 25 can stably connect the terminal body 232 and the wall portion 213, but the connecting member 25 can also be protected.

[0336] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: a housing having a wall portion; an electrode assembly housed in the housing, the electrode assembly having a first electrode lead-out portion; a first electrode terminal disposed on the wall portion, the first electrode terminal being electrically connected to the first electrode lead portion; a first insulating member configured to separate the first electrode terminal and the wall portion; A connector electrically connects the first electrode terminal and the housing, wherein a minimum flow area of ​​the connector is smaller than a minimum flow area of ​​the first electrode lead-out portion.

2. The battery cell according to claim 1, wherein: A mounting hole is provided on the wall portion, and the first electrode terminal includes a terminal body and a first limiting portion. The terminal body is at least partially accommodated in the mounting hole, and the first limiting portion is provided at one end of the terminal body. Along the thickness direction of the wall portion, the first limiting portion is arranged opposite to the wall portion, and the connecting member connects the first limiting portion and the wall portion.

3. The battery cell according to claim 2, wherein: Along the thickness direction of the wall portion, the connecting member is located between the first limiting portion and the wall portion.

4. The battery cell according to claim 3, wherein: Along the thickness direction of the wall portion, the first limiting portion is arranged on a side of the wall portion away from the electrode assembly.

5. The battery cell according to claim 4, wherein: The first insulating member is provided with a first through hole, which penetrates the first insulating member along the thickness direction of the wall portion, and the connecting member is at least partially accommodated in the first through hole.

6. The battery cell according to claim 3, wherein: Along the thickness direction of the wall portion, the first limiting portion is arranged on a side of the wall portion facing the electrode assembly.

7. The battery cell according to claim 6, wherein: The battery cell includes a second insulating member, which is provided on a side of the wall portion facing the electrode assembly along a thickness direction of the wall portion, and is configured to insulate and isolate the wall portion from the electrode assembly; The second insulating member is provided with a second through hole, which penetrates the second insulating member along the thickness direction of the wall portion, and the connecting member is at least partially accommodated in the second through hole.

8. The battery cell according to any one of claims 3 to 7, wherein: The connecting member is an elastic element, and along the thickness direction of the wall portion, two ends of the connecting member are respectively in contact with the first limiting portion and the wall portion.

9. The battery cell according to claim 8, wherein: The elastic element includes a spring.

10. The battery cell according to claim 9, wherein: The spring includes a first connecting portion, a fuse portion, and a second connecting portion, the fuse portion connects the first connecting portion and the second connecting portion, the first connecting portion and the second connecting portion are respectively connected to the first limiting portion and the wall portion, the minimum flow area of ​​the fuse portion is smaller than the minimum flow area of ​​the first connecting portion, and the minimum flow area of ​​the fuse portion is smaller than the minimum flow area of ​​the second connecting portion.

11. The battery cell according to claim 2, wherein: The wall portion is provided with a protruding portion, the protruding portion and the first limiting portion are located on the same side of the wall portion along the thickness direction of the wall portion, and the connecting member connects the protruding portion and the first limiting portion.

12. The battery cell according to claim 11, wherein: The first limiting portion is provided with a first clamping slot, the protruding portion is provided with a second clamping slot, and the connecting member is clamped in the first clamping slot and the second clamping slot.

13. The battery cell according to claim 12, wherein: The protrusion has a first surface facing away from the wall portion, and the second slot is recessed from the first surface toward the wall portion; Along the thickness direction of the wall portion, the connecting member has a second surface closest to the first surface, and a minimum distance between the first surface and the second surface is A, satisfying: A≥0.2 mm.

14. The battery cell according to claim 13, wherein: 0.5mm≤A≤1mm.

15. The battery cell according to any one of claims 12 to 14, wherein: The first insulating member includes a main body and a covering portion, wherein the covering portion is disposed around the main body, and along the thickness direction of the wall portion, the main body is located between the first limiting portion and the wall portion, and the covering portion covers the outer circumferential surface of the first limiting portion; The covering portion is provided with a third slot, and the connecting member is locked in the third slot.

16. The battery cell according to claim 15, wherein: Along the thickness direction of the wall portion, the connecting member has a third surface closest to the bottom surface of the third slot, and the minimum distance between the third surface and the bottom surface of the third slot is B, satisfying: B≥0.2mm.

17. The battery cell according to claim 16, wherein: 0.5mm≤B≤1mm.

18. The battery cell according to any one of claims 11 to 17, wherein: The connecting member is a strip-shaped structure extending along a first direction, and the first direction intersects with a thickness direction of the wall portion.

19. The battery cell according to claim 18, wherein: The connecting member includes a first connecting portion, a fuse portion, and a second connecting portion arranged along a first direction, the fuse portion connects the first connecting portion and the second connecting portion, the first connecting portion and the second connecting portion are respectively connected to the first limiting portion and the protrusion, the minimum flow area of ​​the fuse portion is smaller than the minimum flow area of ​​the first connecting portion, and the minimum flow area of ​​the fuse portion is smaller than the minimum flow area of ​​the second connecting portion.

20. The battery cell according to any one of claims 2 to 19, wherein: The battery cell includes a plurality of the connecting members, and the plurality of the connecting members are distributed at intervals along the circumference of the terminal body.

21. The battery cell according to claim 1, wherein: A mounting hole is provided on the wall portion, and the first electrode terminal includes a terminal body and a first limiting portion. The terminal body is at least partially accommodated in the mounting hole, and the first limiting portion is provided at one end of the terminal body. Along the thickness direction of the wall portion, the first limiting portion is arranged opposite to the wall portion, and the connecting member connects the wall portion and the terminal body.

22. The battery cell according to claim 21, wherein: Along the thickness direction of the wall portion, the first limiting portion is arranged on a side of the wall portion away from the electrode assembly.

23. The battery cell according to claim 22, wherein: Along the thickness direction of the wall portion, the connecting member is located on a side of the wall portion away from the electrode assembly, and a first limiting groove is formed on a side of the first insulating member facing the wall portion, and the connecting member is accommodated in the first limiting groove.

24. The battery cell according to claim 21, wherein: Along the thickness direction of the wall portion, the first limiting portion is arranged on a side of the wall portion facing the electrode assembly.

25. The battery cell according to claim 24, wherein: The battery cell includes a second insulating member, which is arranged on the side of the wall facing the electrode assembly along the thickness direction of the wall portion. The second insulating member is configured to insulate and isolate the wall portion and the electrode assembly. The connecting member is located on the side of the wall portion facing the electrode assembly. A second limiting groove is provided on the side of the second insulating member facing the wall portion, and the connecting member is accommodated in the second limiting groove.

26. The battery cell according to any one of claims 22 to 25, wherein: The connecting part includes a first connecting part, a fuse part and a second connecting part, the fuse part connects the first connecting part and the second connecting part, the first connecting part and the second connecting part are respectively connected to the terminal body and the wall part, the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connecting part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the second connecting part.

27. The battery cell according to claim 26, wherein: The first connecting portion and the second connecting portion are both annular. The first connecting portion is located inside the second connecting portion. The first connecting portion has a center hole, and the terminal body is inserted into the center hole.

28. The battery cell according to claim 27, wherein: The connecting member includes a plurality of the fusible parts, and the plurality of the fusible parts are arranged at intervals along the circumference of the first connecting part.

29. The battery cell according to any one of claims 2 to 28, wherein: The electrode terminal further includes a second limiting portion, wherein the second limiting portion and the first limiting portion are respectively located on both sides of the wall portion, and the second limiting portion and the first limiting portion are used to cooperate with each other to limit the terminal body from being separated from the mounting hole.

30. The battery cell according to any one of claims 1 to 29, wherein: The connecting member includes a first connecting part, a fuse part, and a second connecting part, the fuse part connects the first connecting part and the second connecting part, the first connecting part and the second connecting part are respectively connected to the first electrode terminal and the shell, the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connecting part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the second connecting part.

31. The battery cell according to claim 30, wherein: The battery cell includes a third insulating member, and the third insulating member is covered on the fuse portion.

32. The battery cell according to claim 30 or 31, wherein: The minimum flow area of ​​the fuse is S, which satisfies: 2mm 2 ≤S≤20mm 2 .

33. The battery cell according to any one of claims 30 to 32, wherein: The length of the fuse portion is L, which satisfies the following conditions: 0.3 mm ≤ L ≤ 5 mm.

34. The battery cell according to any one of claims 1 to 33, wherein: The connecting member electrically connects the first electrode terminal and the wall portion.

35. The battery cell according to any one of claims 1 to 34, wherein: The battery cell further includes a second electrode terminal, which is insulated and mounted on the wall portion. The electrode assembly further includes a second electrode lead portion, and the second electrode terminal is electrically connected to the second electrode lead portion.

36. The battery cell according to any one of claims 1 to 35, wherein: The first electrode terminal is a positive electrode terminal.

37. A battery, wherein: Comprising the battery cell according to any one of claims 1-36.

38. An electrical device, wherein: Comprising the battery cell according to any one of claims 1-36.

Images