Battery cells, batteries and electrical equipment

Abstract

The present application provides a battery cell, a battery and an electrical device. The battery cell includes a shell, an electrode assembly, a first electrode terminal, a first insulating member and a connector. The shell has a wall portion, and the electrode assembly is accommodated in the shell. 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 connector electrically connects the first electrode terminal and the shell, and the minimum flow area of ​​the connector is smaller than the minimum flow area of ​​the first electrode lead-out portion. The first electrode terminal is electrically connected to the shell through the connector, so that the shell can output the electrical energy of the electrode assembly. The battery management system can be connected to the shell of the battery cell, thereby realizing the monitoring of the battery cell, which greatly reduces the difficulty of wiring. When a short circuit occurs in the battery cell, the connector can fuse itself, thereby protecting the electrode assembly, which is conducive to improving the reliability of the battery cell.

Description

Technical Field

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

[0002] Batteries are widely used in the field of new energy, such as electric vehicles and new energy vehicles. New energy vehicles and electric vehicles have become a new trend in the development of the automotive industry. The development of battery technology must consider multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the difficulty of battery wiring must also be considered. At present, the difficulty of battery wiring is relatively large. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, which are intended to improve the problem of difficulty in wiring the battery in the related art.

[0004] In the 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.

[0005] In the above technical solution, the first electrode terminal of the battery cell is electrically connected to the shell through a connector, so that the shell can output the electrical energy of the electrode assembly, and the battery management system can be connected to the shell of the battery cell, thereby realizing the monitoring of the battery cell, which greatly reduces the wiring difficulty. In addition, the minimum flow area of ​​the connector is smaller than the minimum flow area 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 can fuse itself, thereby protecting the electrode assembly, reducing the risk of fire and explosion of the battery cell, and helping to improve the reliability of the battery cell.

[0006] 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, 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.

[0007] In the above technical solution, the terminal body is at least partially accommodated in the mounting hole, the first limiting portion is connected to one end of the terminal body and is arranged opposite to the wall portion to prevent the terminal body from escaping from the mounting hole in the direction from the first limiting portion to the wall portion. The connecting member connects the first limiting portion and the wall portion, thereby realizing the electrical connection between the first electrode terminal and the housing.

[0008] 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.

[0009] In the above technical solution, by arranging the connector between the first limiting portion and the wall portion, the risk of interference between the connector and other components is reduced, so that the connector can stably connect the first limiting portion and the wall portion, which is beneficial to improving the life of the battery cell.

[0010] 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.

[0011] In the above technical solution, the first limiter is arranged on the side of the wall away from the electrode assembly, and since the connector is located between the wall and the first limiter, the connector is also located on the side of the wall away from the electrode assembly. By arranging the connector on the side of the wall away from the electrode assembly, the connector is not easily affected by the electrolyte, which is beneficial to improve the life of the connector, thereby increasing the number of cycles of the battery cell.

[0012] 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 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.

[0013] In the above technical solution, by providing the first through hole on the first insulating member, on the one hand, it is convenient to avoid the connecting member, thereby allowing the connecting member to connect the first limit portion and the wall portion. On the other hand, accommodating the connecting member at least partially in the first through hole can protect the connecting member, further reducing the risk of interference between the connecting member and other components, so that the connecting member can stably connect the first limit portion and the wall portion, which is conducive to improving the life of the battery cell.

[0014] 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.

[0015] In the above technical solution, the first limiting portion is arranged on the side of the wall facing the electrode assembly, and since the connecting member is located between the wall and the first limiting portion, the connecting member is also located on the side of the wall facing the electrode assembly. By arranging the connecting member on the side of the wall facing the electrode assembly, the connecting member is not easy to interfere with other components, which is conducive to improving the life of the battery cell.

[0016] 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 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.

[0017] In the above technical solution, by providing a second insulating member to insulate and isolate the wall portion and the electrode assembly, the risk of short circuit caused by contact between the wall portion and the electrode assembly is reduced. By providing a second through hole on the second insulating member, on the one hand, it is convenient to avoid the connector, thereby allowing the connector to connect the first limit portion and the wall portion. On the other hand, accommodating the connector at least partially in the second through hole can protect the connector, further reduce the risk of interference between the connector and other components, and make the connector less susceptible to the influence of the electrolyte, which is conducive to increasing the life of the connector, thereby increasing the number of cycles of the battery cell.

[0018] 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 abutted against the first limiting portion and the wall portion.

[0019] In the above technical solution, since the connector is an elastic element, it can apply elastic force to the first limit portion and the wall portion, so that the connector can stably contact the first limit portion and the wall portion, and the connector can stably connect the first limit portion and the wall portion, which is conducive to improving the life of the battery cell. In addition, when manufacturing the battery cell, the electrical connection between the first limit portion and the wall portion can be achieved by simply squeezing the connector through the first limit portion and the wall portion, which is simple and convenient.

[0020] As an optional technical solution of the embodiment of the present application, the elastic element includes a spring.

[0021] 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.

[0022] 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.

[0023] In the above technical solution, the first connection part is connected to the first limit part, the second connection part is connected to the wall part, the fuse part is connected to the first connection part and the second connection part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connection part, and smaller than the minimum flow area of ​​the second connection part. When the current passing through the fuse part is too large, the fuse part will melt automatically, disconnecting the first connection part and the second connection part to play a protective role, reducing the risk of fire and explosion of the battery cell, which is conducive to improving the reliability of the battery cell.

[0024] 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.

[0025] In the above technical solution, a protrusion is provided on the wall so that the protrusion and the first limiting portion are located on the same side of the wall along the thickness direction of the wall, 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In the above technical solution, the connector is clamped in the second clamping groove, 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 clamping groove can better protect the connector, reduce the risk of damage to the connector, and increase the life of the battery cell.

[0030] As an optional technical solution of the embodiment of the present application, 0.5mm≤A≤1mm.

[0031] 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 has a better protective effect on 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, which can not only reduce the occupation of the internal space of the battery by the protrusion, but also reduce the risk of interference between the protrusion and 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 interference between the protrusion and other components.

[0032] 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, 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 slot is provided on the covering part, and the connecting part is clamped in the third slot.

[0033] In the above technical solution, the main body is located between the first limiting portion and the wall portion, and the covering portion covers the outer peripheral surface of the first limiting portion to better separate the first limiting portion and the wall portion, thereby reducing the risk of direct contact between the first limiting portion and the wall portion. By providing a third clamping groove on the covering portion to avoid the connecting member, the connecting member is conveniently clamped in the first clamping groove and the second clamping groove. By clamping the connecting member in the first clamping groove, the second clamping groove and the third clamping groove, it is convenient to quickly locate the connecting member, and the connecting member is electrically connected to the first limiting portion and the protruding portion, which is conducive to simplifying installation.

[0034] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the connecting piece 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.

[0035] 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, thereby reducing the risk of interference between the first insulating part and the connector when the first insulating part moves, which is beneficial to increasing the life of the connector and thus increasing the number of cycles of the battery cell.

[0036] As an optional technical solution of the embodiment of the present application, 0.5mm≤B≤1mm.

[0037] In the above technical solution, by making the minimum distance between the third surface and the bottom surface of the third slot along the thickness direction of the wall portion greater than or equal to 0.5mm, the distance between the connector and the bottom surface of the third slot is relatively large. When the first insulating member moves, the first insulating member is not easy to collide with the connector, and it is not easy to cause damage to the connector. By making the minimum distance between the third surface and the bottom surface of the third slot along the thickness direction of the wall portion less than or equal to 1mm, the distance between the connector and the bottom surface of the third slot is not too large, so that the covering portion can still play a good separation effect. Therefore, when 0.5mm≤B≤1mm, it is possible to take into account both the protection of the connector and the covering effect of the covering portion.

[0038] 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.

[0039] In the above technical solution, by setting the connecting member as a strip structure extending along the first direction, it is convenient for the connecting portion to overlap the protruding portion and the first limiting portion to achieve electrical connection between the first electrode terminal and the housing. In addition, in the embodiment where the connecting member is clamped in the first clamping slot and the second clamping slot, it is also possible to make the connecting member clamped in the first clamping slot and the second clamping slot more convenient.

[0040] 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.

[0041] In the above technical solution, the first connection part is connected to the first limit part, the second connection part is connected to the protruding part, the fuse part is connected to the first connection part and the second connection part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connection part, and smaller than the minimum flow area of ​​the second connection part. When the current passing through the fuse part is too large, the fuse part will melt automatically, disconnecting the first connection part and the second connection part to play a protective role, reducing the risk of fire and explosion of the battery cell, which is conducive to improving the reliability of the battery cell.

[0042] 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.

[0043] In the above technical solution, by providing multiple connectors, the current capacity can be increased, so that the battery cell can output a larger current. By distributing multiple connectors at intervals along the circumference of the terminal body, the force around the terminal body can be more uniform.

[0044] 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, 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.

[0045] In the above technical solution, the terminal body is at least partially accommodated in the mounting hole, the first limit portion is connected to one end of the terminal body and is arranged opposite to the wall portion to prevent the terminal body from escaping from the mounting hole in the direction from which the first limit portion points to 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.

[0046] 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.

[0047] In the above technical solution, the first limiting portion is arranged on a 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 in a direction toward the electrode assembly.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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, and the connecting member is located on the side of the wall portion facing the electrode assembly, and 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.

[0053] In the above technical solution, by providing a second insulating member to insulate and isolate the wall portion and the electrode assembly, the risk of short circuit caused by contact between the wall portion and the electrode assembly is reduced. By providing a second limiting groove on the second insulating member and accommodating the connector in the second limiting groove, not only can the connector be limited, so that the connector can stably connect the terminal body and the wall portion, but also the connector can be protected, reducing the risk of interference between the connector and other components, and making the connector less susceptible to the influence of the electrolyte, which is conducive to improving the life of the connector, thereby increasing the number of cycles of the battery cell.

[0054] 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.

[0055] In the above technical solution, the first connection part is connected to the terminal body, the second connection part is connected to the wall part, the fuse part connects the first connection part and the second connection part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connection part, and smaller than the minimum flow area of ​​the second connection part. When the current passing through the fuse part is too large, the fuse part will melt automatically, disconnecting the first connection part and the second connection part to play a protective role, reducing the risk of fire and explosion of the battery cell, which is conducive to improving the reliability of the battery cell.

[0056] 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.

[0057] In the above technical solution, by making the first connection part and the second connection part both annular, it is convenient to connect the first connection part with the terminal body and the second connection part with the wall, and the force around the terminal body is uniform.

[0058] 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.

[0059] In the above technical solution, by providing multiple fuses, the current capacity can be increased, so that the battery cell can output a larger current. By distributing multiple fuses at intervals along the circumference of the first connecting part, the force on the first connecting part and the second connecting part is more uniform.

[0060] As an optional technical solution of an embodiment of the present application, the electrode terminal also includes a second limiting portion, 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.

[0061] In the above technical solution, by providing the first limiting portion and the second limiting portion, the first limiting portion and the second limiting portion cooperate to limit the terminal body from being separated from the mounting hole, which is conducive to reducing the risk of the first electrode terminal being separated from the wall portion and extending the life of the battery cell. In addition, the first limiting portion, the terminal body and the second limiting portion can be formed by riveting, which is simple and convenient to manufacture and has high reliability.

[0062] 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.

[0063] In the above technical solution, the first connection part is connected to the first electrode terminal, the second connection part is connected to the housing, the fuse part connects the first connection part and the second connection part, and the minimum flow area of ​​the fuse part is smaller than the minimum flow area of ​​the first connection part, and smaller than the minimum flow area of ​​the second connection part. When the current passing through the fuse part is too large, the fuse part will melt automatically, disconnecting the first connection part and the second connection part to play a protective role, reducing the risk of fire and explosion of the battery cell, which is conducive to improving the reliability of the battery cell.

[0064] 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.

[0065] 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 increasing the number of cycles of the battery cell.

[0066] 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 .

[0067] In the above technical solution, when S≥2mm 2 When S≤20mm, the fuse has a larger flow area, so that the battery cell can output a larger current. 2 When the fuse is 2mm, the flow area of ​​the fuse is not too large, so that when a short circuit occurs in the battery cell, the fuse can be blown 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 fuse in time when the battery cell is short-circuited.

[0068] As an optional technical solution of the embodiment of the present application, the length of the fuse portion is L, satisfying: 0.3mm≤L≤5mm.

[0069] In the above technical solution, when L≥0.3mm, the fuse has a longer length and a higher resistance, and when the battery cell is short-circuited, it can generate a large amount of heat, so that the fuse can be blown in time. When L≤5mm, the length of the fuse is not too long, and the resistance of the fuse is not too high, so that the battery cell can output a larger current. Therefore, when 0.3mm≤L≤5mm, the battery cell can output a larger current and can be blown in time when a short circuit occurs in the battery cell.

[0070] 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.

[0071] 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, which greatly reduces the difficulty of wiring.

[0072] As an optional technical solution of an embodiment of the present application, the battery cell further includes a second electrode terminal, the second electrode terminal is insulated and mounted on the wall portion, and the electrode assembly further includes a second electrode lead-out portion, the second electrode terminal is electrically connected to the second electrode lead-out portion.

[0073] In the above technical solution, the shell can be electrically connected to the first electrode lead-out portion, the second electrode terminal can be electrically connected to the second electrode lead-out portion, the shell can serve as the positive electrode or negative electrode of the battery cell, and the second electrode terminal can serve as the negative electrode or positive electrode of the battery cell to output the electric energy of the battery cell. When both the first electrode lead-out portion and the second electrode lead-out portion are electrically connected to the shell, the battery cell is short-circuited, and the connector can fuse itself, so that the first electrode lead-out portion is disconnected from the shell, thereby protecting the electrode assembly, reducing the risk of fire and explosion of the battery cell, and helping to improve the reliability of the battery cell.

[0074] As an optional technical solution of an embodiment of the present application, the first electrode terminal is a positive electrode terminal.

[0075] 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.

[0076] In a second aspect, an embodiment of the present application further provides a battery, which includes the above-mentioned battery cell.

[0077] In a third aspect, an embodiment of the present application further provides an electrical device, wherein the electrical device comprises the above-mentioned battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0079] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0080] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0081] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0082] Figure 4 An exploded view of a battery cell provided for some embodiments of the present application;

[0083] Figure 5 An exploded view of a wall portion and a first electrode terminal provided in some embodiments of the present application;

[0084] Figure 6 A schematic top view of a wall portion provided for some embodiments of the present application;

[0085] Figure 7 for Figure 6 Sectional view at the AA position;

[0086] Figure 8 for Figure 7 A magnified view of position B in the middle;

[0087] Fig. 9 An exploded view of a wall portion and a first electrode terminal provided in some other embodiments of the present application;

[0088] Fig.10 A schematic top view of a wall portion provided for some other embodiments of the present application;

[0089] Fig.11 for Fig.10 Cross-sectional view at the mid-CC position;

[0090] Fig.12 for Fig.11 Enlarged view of the D position in the middle;

[0091] Fig.13 A schematic diagram of the structure of a connector provided in some embodiments of the present application;

[0092] Fig.14A schematic diagram of the structure of a connecting member (a third insulating member covering a fuse portion) provided in some embodiments of the present application;

[0093] Fig.15 An exploded view of a wall portion and a first electrode terminal provided in some other embodiments of the present application;

[0094] Fig.16 A schematic top view of a wall portion provided in some other embodiments of the present application;

[0095] Fig.17 for Fig.16 Cross-sectional view at the EE position;

[0096] Fig.18 for Fig.17 Enlarged view of the F position in the middle;

[0097] Fig.19 A schematic diagram of the structure of a connector provided in some other embodiments of the present application;

[0098] Fig. 20 A schematic diagram of the structure of a connector (a third insulating member covering a fuse portion) provided in some other embodiments of the present application;

[0099] Fig.21 An exploded view of a wall portion and a first electrode terminal provided in some further embodiments of the present application;

[0100] Fig. 22 A schematic top view of a wall portion provided in some further embodiments of the present application;

[0101] Fig.23 for Fig. 22 Cross-sectional view of the middle GG position;

[0102] Fig.24 for Fig.23 A magnified view of the middle H position;

[0103] Fig.25 A schematic diagram of the structure of a connector provided in some further embodiments of the present application.

[0104] Icons: 10-box; 11-first part; 12-second part; 20-battery cell; 21-housing; 211-end cover; 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 pole ear; 2212-first current collecting member; 222-second electrode lead-out portion; 2221-second pole ear; 2222-second current collecting member; 23-first electrode terminal; 231-first limit portion; 2311-first slot; 232-terminal body; 233-second Limiting part; 24-first insulating member; 241-main body; 2411-first through hole; 242-covering part; 2421-third slot; 243-first limiting slot; 25-connecting member; 251-first connecting part; 2511-center hole; 252-fusing part; 253-second connecting part; 254-third insulating member; 255-second surface; 256-third surface; 26-second insulating member; 261-second through hole; 27-second electrode terminal; 271-limiting part; 272-rivet part; 28-fourth insulating member; 29-sealing member; 100-battery; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0105] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0106] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0107] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0108] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0109] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0110] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0111] The term "plurality" used in the present application refers to two or more (including two).

[0112] 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.

[0113] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0114] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0115] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0116] 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 disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0117] 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 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.).

[0118] 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 positive electrode active materials for batteries can also be used. These positive electrode active materials can 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 NCM622 )、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 its modified compounds, etc.

[0119] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0120] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0121] As an example, the negative electrode current collector may be a metal foil, a foamed metal 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 foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base 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.).

[0122] 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.

[0123] 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 disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0124] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells 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.

[0125] 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.

[0126] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0127] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0128] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0129] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0130] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0131] 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 dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0132] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl 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.

[0133] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0134] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0135] 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, and the like.

[0136] 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.

[0137] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0138] 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.

[0139] In some embodiments, the electrode assembly is a laminate structure.

[0140] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0141] 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.

[0142] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0143] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0144] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0145] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0146] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0147] In some embodiments, the 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 (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0148] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. Prismatic battery cells include but are not limited to square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries, such as hexagonal prismatic batteries.

[0149] 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.

[0150] 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.

[0151] 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 accommodated in the case.

[0152] 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.

[0153] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0154] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0155] The development of battery technology must consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the difficulty of battery wiring must also be considered. At present, the difficulty of battery wiring is relatively large.

[0156] A battery generally has multiple battery cells to provide higher voltage and capacity. In order to monitor the parameters of each battery cell, the battery management system needs to be electrically connected to the positive electrode terminal and the negative electrode terminal of each battery cell. However, the positive electrode terminal and the negative electrode terminal are small, which makes wiring more difficult.

[0157] In view of this, an embodiment of the present application provides a battery cell, the 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 in the housing, and the electrode assembly has a first electrode lead-out portion. The first electrode terminal is disposed 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 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-out portion.

[0158] The first electrode terminal of the battery cell is electrically connected to the shell through a connector, so that the shell can output the electrical energy of the electrode assembly. The battery management system can be connected to the shell of the battery cell, thereby realizing the monitoring of the battery cell, greatly reducing the difficulty of wiring. In addition, the minimum flow area of ​​the connector is smaller than the minimum flow area 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 can fuse itself, thereby protecting the electrode assembly, reducing the risk of fire and explosion of the battery cell, and helping to improve the reliability of the battery cell.

[0159] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0160] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0161] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0162] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may 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 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and 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.

[0163] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0164] Please refer to Figure 2 , Figure 2An 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, and the battery cell 20 is contained in the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the housing 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0165] 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 mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0166] Each battery cell 20 may be a secondary battery cell or a primary battery cell, or 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.

[0167] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application. Figure 4 An exploded view of a battery cell 20 provided in accordance with some embodiments of the present application. Figure 5 An exploded view of the wall portion 213 and the first electrode terminal 23 provided in some embodiments of the present application. Figure 6 A schematic top view of the wall portion 213 provided in some embodiments of the present application. Figure 7for Figure 6 Cross-sectional view at the AA position. Figure 8 for Figure 7 An enlarged view of position B in the figure. An embodiment of the present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22, a first electrode terminal 23, a first insulating member 24 and a connecting member 25. The shell 21 has a wall portion 213, and the electrode assembly 22 is accommodated in the shell 21, and the electrode assembly 22 has a first electrode lead-out portion 221. The first electrode terminal 23 is disposed on the wall portion 213, and the first electrode terminal 23 is electrically connected to the first electrode lead-out portion 221. The first insulating member 24 is configured to separate the first electrode terminal 23 and the wall portion 213. The connecting member 25 electrically connects the first electrode terminal 23 and the shell 21, and the minimum flow area of ​​the connecting member 25 is smaller than the minimum flow area of ​​the first electrode lead-out portion 221.

[0168] The battery cell 20 refers to the smallest unit constituting the battery 100 .

[0169] The housing 21 includes an end cap 211 and a shell 212. The shell 212 has a receiving space with one end open, and the receiving space is used to receive the electrode assembly 22. The end cap 211 is connected to the shell 212 and closes the opening.

[0170] 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.

[0171] The shell 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 212 and the end cap 211 can be independent components, and an opening can be set on the shell 212, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 211 at the opening. Without limitation, the end cap 211 and the shell 212 can also be integrated. Specifically, the end cap 211 and the shell 212 can form a common joint surface before other components are put into the shell, and when the interior of the shell 212 needs to be encapsulated, the end cap 211 covers the shell 212. The shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0172] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be included in the housing 21. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 22, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear. The positive pole ear and the negative pole ear 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.

[0173] The wall portion 213 may be an end cover 211 of the housing 21, or may be a wall of the shell 212 of the housing 21. In some implementations, such as Figure 3 and Figure 4 As shown, the wall portion 213 is the end cap 211. In other embodiments, the wall portion 213 may be a bottom wall of the housing 212 opposite to the end cap 211. In still other embodiments, the wall portion 213 may also be a side wall of the housing 212 adjacent to and connected to the end cap 211.

[0174] The first electrode lead-out portion 221 is a structure for leading out the electric energy of the main body or introducing the electric energy into the main body. The first electrode lead-out portion 221 includes a first pole tab 2211, which is the positive pole tab or the negative pole tab mentioned above, and the first pole tab 2211 can be directly connected to the first electrode terminal 23. In other embodiments, the first electrode lead-out portion 221 may also include other electrical connection components connected to the first pole tab 2211, for example, the first electrode lead-out portion 221 may also include a first current collecting member 2212, and the first current collecting member 2212 connects the first pole tab 2211 and the first electrode terminal 23 to guide the electric energy of the electrode assembly 22 to the first electrode terminal 23 or receive the electric energy introduced from the first electrode terminal 23.

[0175] The first electrode tab 2211 may 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.

[0176] The first insulating member 24 is commonly known as upper plastic, and 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 connecting member 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 and the wall portion 213. Exemplarily, the first insulating member 24 can be plastic, rubber, etc.

[0177] The connector 25 is a conductive member made of a conductive material and connects the first electrode terminal 23 and the housing 21 to allow current to be transmitted to the housing 21 through the first electrode terminal 23 .

[0178] In the embodiment where the first electrode lead-out portion 221 only includes the first pole tab 2211, "the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode lead-out portion 221" means: the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first pole tab 2211. In the embodiment where the first electrode lead-out portion 221 includes the first pole 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-out portion 221" means: the minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first pole 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. In this way, the connector 25 is configured to be able to perform fuse protection on the electrode assembly 22, and the connector 25 can be melted when the current passing through it is too large, thereby disconnecting the first electrode terminal 23 and the housing 21, and playing a role in short circuit protection or overload protection.

[0179] 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.

[0180] 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.

[0181] The minimum current 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 flow through on the flow path of the first electrode lead-out portion 221 when the current flows 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 current flow area of ​​the first electrode lead-out portion 221.

[0182] 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 current flow direction can be determined by tomography, and the area of ​​the minimum cross-section of the first electrode lead-out portion 221 perpendicular to the current flow direction 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.

[0183] The minimum flow area of ​​the connector 25 is smaller than the minimum flow area of ​​the first electrode lead-out portion, that is, on the current flow path, the minimum cross-sectional area of ​​the connector 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.

[0184] It should be noted that, in the current flow path, the minimum cross-sectional area of ​​the connector 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. 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 case of a short circuit, according to the heat formula (Q = I 2Rt), it can be known that 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 accumulation speed is faster than that of the first electrode lead-out portion 221, so that the connector 25 will take precedence over and be more likely to fuse than the first electrode lead-out portion 221 in the event of a short circuit, so that when a short circuit occurs in the battery cell 20, 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 use risk further caused by the short circuit of the battery cell 20.

[0185] The first electrode terminal 23 of the battery cell 20 is electrically connected to the housing 21 through the connector 25, so that the housing 21 can output the electrical energy of the electrode assembly 22. The battery 100 management system can be connected to the housing 21 of the battery cell 20, thereby realizing the monitoring of the battery cell 20, greatly reducing the wiring difficulty. 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, reducing the risk of fire and explosion of the battery cell 20, and helping to improve the reliability of the battery cell 20.

[0186] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 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 limiting portion 231. 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. Along the thickness direction of the wall portion 213, the first limiting portion 231 is provided opposite to the wall portion 213, and the connecting member 25 connects the first limiting portion 231 and the wall portion 213.

[0187] Please refer to Figure 4 , Figure 5 , Figure 7 and Figure 8 , the thickness direction of the wall portion 213 is the X direction shown in the figure.

[0188] 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.

[0189] The terminal body 232 is partially or completely accommodated in the mounting hole 2132, and the first limiting portion 231 is connected to one side of the terminal body 232. The first limiting portion 231 is arranged opposite to the wall portion 213 along the thickness direction of the wall portion 213, and the first limiting portion 231 can prevent the terminal body 232 from escaping from the mounting hole 2132 in the direction from which the first limiting portion 231 points to the wall portion 213.

[0190] The first electrode lead-out portion 221 is electrically connected to the terminal body 232 , and 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 .

[0191] The terminal body 232 is at least partially accommodated in the mounting hole 2132, and the first limiting portion 231 is connected to one end of the terminal body 232 and is arranged opposite to the wall portion 213 to prevent the terminal body 232 from being separated from the mounting hole 2132 in the direction from the first limiting portion 231 to the wall portion 213. The connecting member 25 connects the first limiting portion 231 and the wall portion 213, thereby realizing the electrical connection between the first electrode terminal 23 and the housing 21.

[0192] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 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 .

[0193] Along the thickness direction of the wall portion 213, a portion of the connector 25 may be located between the first position limiting portion 231 and the wall portion 213, and a portion of the connector 25 may be located outside the first position limiting portion 231 and the wall portion 213. Along the thickness direction of the wall portion 213, the connector 25 may also be completely located between the first position limiting portion 231 and the wall portion 213.

[0194] 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 .

[0195] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 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 .

[0196] The first limiting portion 231 is disposed on a side of the wall portion 213 away from the electrode assembly 22 along the thickness direction of the wall portion 213. 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 away from the electrode assembly 22.

[0197] By arranging the connector 25 on the side of the wall portion 213 away from the electrode assembly 22 , the connector 25 is not easily affected by 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 .

[0198] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, the first insulating member 24 is provided with a first through hole 2411 , and the first through hole 2411 penetrates 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 .

[0199] 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 , and the first through hole 2411 is provided at the portion of the first insulating member 24 located between the first limiting portion 231 and the wall portion 213 .

[0200] Optionally, the first insulating member 24 includes a body portion 241 and a covering portion 242, wherein the covering portion 242 is disposed around the body portion 241, and along the thickness direction of the wall portion 213, the body portion 241 is located between the first limiting portion 231 and the wall portion 213, and the covering portion 242 covers the outer peripheral surface of the first limiting portion 231. A first through hole 2411 is disposed in the body portion 241, and the first through hole 2411 penetrates two oppositely disposed surfaces of the body portion 241 along the thickness direction of the wall portion 213.

[0201] 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 .

[0202] By providing the first through hole 2411 on the first insulating member 24, on the one hand, it is convenient to avoid the connecting member 25, so as to allow the connecting member 25 to connect the first limiting portion 231 and the wall portion 213. On the other hand, accommodating the connecting member 25 at least partially in the first through hole 2411 can protect the connecting member 25, further reduce the risk of interference between the connecting member 25 and other components, so that the connecting member 25 can stably connect the first limiting portion 231 and the wall portion 213, which is conducive to improving the life of the battery cell 20.

[0203] Please refer to Fig. 9 , Fig.10 , Fig.11 and Fig.12 , Fig. 9 Exploded views of the wall portion 213 and the first electrode terminal 23 provided in some other embodiments of the present application. Fig.10 Schematic top view of the wall portion 213 provided in some other embodiments of the present application. Fig.11 for Fig.10 Cross-sectional view at the CC position. Fig.12 for Fig.11 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 .

[0204] The first limiting portion 231 is disposed on a side of the wall portion 213 facing the electrode assembly 22 along the thickness direction of the wall portion 213. At this time, the first limiting portion 231 is located in 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 the electrode assembly 22.

[0205] 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 .

[0206] Please refer to Fig. 9 , Fig.10 , Fig.11 and Fig.12 In some embodiments, the battery cell 20 includes a second insulating member 26, which is disposed on a side of the wall portion 213 facing the electrode assembly 22 along the thickness direction of the wall portion 213, and is configured to insulate and isolate the wall portion 213 and the electrode assembly 22. The second insulating member 26 is provided with a second through hole 261, which 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.

[0207] The second insulating member 26 is commonly called lower plastic, and is disposed inside the wall 213. The second insulating member 26 is used to insulate and isolate the electrode assembly 22 from the wall 213 to reduce the risk of short circuit. For example, the second insulating member 26 can be plastic, rubber, etc.

[0208] 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, and the second through hole 261 is provided at 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 passes through two oppositely disposed surfaces of the second insulating member 26 along the thickness direction of the wall portion 213.

[0209] 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 .

[0210] By providing the second insulating member 26 to insulate and isolate the wall portion 213 and the electrode assembly 22, the risk of short circuit caused by contact between the wall portion 213 and the electrode assembly 22 is reduced. By providing the second through hole 261 on the second insulating member 26, on the one hand, it is convenient to avoid the connector 25, thereby allowing the connector 25 to connect the first limit portion 231 and the wall portion 213. On the other hand, accommodating the connector 25 at least partially in the second through hole 261 can protect the connector 25, further reduce the risk of interference between the connector 25 and other components, and make the connector 25 less susceptible to the influence of the electrolyte, which is conducive to improving the life of the connector 25, thereby increasing the number of cycles of the battery cell 20.

[0211] Please refer to Fig. 9 , Fig.10 , Fig.11 and Fig.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 the electrolyte flowing out of the battery cell 20 .

[0212] Please refer to Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 , Fig.13 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, two ends of the connector 25 abut against the first limiting portion 231 and the wall portion 213 respectively.

[0213] The elastic element is an element that can undergo elastic deformation. The elastic element can be a spring, a reed, etc. The connecting member 25 is an elastic element, and along the thickness direction of the wall portion 213, the two ends of the elastic element are respectively abutted against the first limit portion 231 and the wall portion 213. The elastic element has an elastic force on both the first limit portion 231 and the wall portion 213.

[0214] Since the connector 25 is an elastic element, it can apply elastic force to the first limit portion 231 and the wall portion 213, so that the connector 25 can stably contact the first limit portion 231 and the wall portion 213, so that the connector 25 can stably connect the first limit portion 231 and the wall portion 213, which is beneficial to improving the life of the battery cell 20. In addition, when manufacturing the battery cell 20, the electrical connection between the first limit portion 231 and the wall portion 213 can be achieved by simply squeezing the connector 25 through the first limit portion 231 and the wall portion 213, which is simple and convenient.

[0215] Please refer to Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 In some embodiments, the elastic element includes a spring.

[0216] 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 .

[0217] Since the deformation direction of the spring is highly controllable and has low cost, using the spring as the connecting member 25 can not only facilitate manufacturing but also reduce manufacturing costs.

[0218] Please refer to Fig.13 and Fig.14 , Fig.14 A schematic diagram of the structure of the connector 25 (the third insulating member 254 covers the fuse 252) provided in some embodiments of the present application. In some embodiments, the spring 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, and the first connector 251 and the second connector 253 are respectively connected to the first limit portion 231 and the wall portion 213. 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.

[0219] The first connection portion 251 is a portion of the connection member 25 connected to the first electrode terminal 23. Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 and Fig.14 In the embodiment shown in the figure, the first connecting portion 251 is connected to the first limiting portion 231 of the first electrode terminal 23 .

[0220] The fuse part 252 is a component that plays a role of fuse protection in the connector 25. The fuse part 252 can be melted when the current passing through it is too large, thereby disconnecting the first connection part 251 and the second connection part 253, so as to disconnect the first electrode terminal 23 and the housing 21, and play a role of short circuit protection or overload protection.

[0221] The second connection portion 253 is a portion of the connector 25 for electrical connection with the housing 21. Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 and Fig.14 In the embodiment shown in the figure, the second connecting portion 253 is connected to the wall portion 213 of the housing 21.

[0222] 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.

[0223] The first connection part 251 is connected to the first limit part 231, the second connection part 253 is connected to the wall part 213, the fuse part 252 connects the first connection part 251 and the second connection part 253, and the minimum flow area of ​​the fuse part 252 is smaller than the minimum flow area of ​​the first connection part 251, and smaller than the minimum flow area of ​​the second connection part 253. When the current passing through the fuse part 252 is too large, the fuse part 252 will melt by itself, disconnecting the first connection part 251 and the second connection part 253 to play a protective role, reduce the risk of fire and explosion of the battery cell 20, and help improve the reliability of the battery cell 20.

[0224] Please refer to Fig.15 , Fig.16 , Fig.17 and Fig.18 , Fig.15 Exploded views of the wall portion 213 and the first electrode terminal 23 provided in some other embodiments of the present application. Fig.16 Schematic top view of the wall portion 213 provided in some other embodiments of the present application. Fig.17 for Fig.16 Cross-sectional view at the EE position. Fig.18 for Fig.17 In some other embodiments, the wall portion 213 is provided with a protrusion 2131, and the protrusion 2131 and the first limit 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 limit portion 231.

[0225] The protrusion 2131 and the first position-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 position-limiting portion 231 is located on the side of the wall portion 213 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 away from the electrode assembly 22. For another example, when the first position-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.

[0226] The connecting member 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 .

[0227] By setting 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, so that the connecting portion overlaps the protrusion 2131 and the first limiting portion 231 to achieve electrical connection between the first electrode terminal 23 and the shell 21.

[0228] Please refer to Fig.15 , Fig.16 , Fig.17 and Fig.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 provided in the first slot 2311 and the second slot 21311 .

[0229] The first slot 2311 is an open slot provided in the first position-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 arranged opposite to 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 position-limiting portion 231, so as to electrically connect the first electrode terminal 23 and the wall portion 213.

[0230] By setting a first slot 2311 on the first limiting portion 231 and a second slot 21311 on the protruding portion 2131, the connecting member 25 can be clamped in the first slot 2311 and the second slot 21311, which is convenient for quickly positioning the connecting member 25 and electrically connecting the connecting member 25 to the first limiting portion 231 and the protruding portion 2131, which is conducive to simplifying the installation.

[0231] Please refer to Fig.15 , Fig.16 , Fig.17 and Fig.18In some embodiments, the protrusion 2131 has a first surface 21312 facing away from the wall portion 213, and the second slot 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: A ≥ 0.2 mm.

[0232] The first surface 21312 is a surface of the protruding portion 2131 that is away from the wall portion 213 , and the second locking groove 21311 is formed by being recessed from the first surface 21312 toward a direction facing the wall portion 213 .

[0233] The second surface 255 is the surface of the connecting member 25 that is closest to the first surface 21312 along the thickness direction of the wall portion 213, that is, the surface of the connecting member 25 that is farthest from the wall portion 213. Fig.18 ,exist Fig.18 In the illustrated embodiment, the second surface 255 is an upper surface of the connecting member 25 .

[0234] 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.

[0235] 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.

[0236] The connector 25 is clamped in the second clamping groove 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 clamping groove 21311 can better protect the connector 25, reduce the risk of damage to the connector 25, and increase the life of the battery cell 20.

[0237] Optionally, 0.5mm≤A≤1mm.

[0238] 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.

[0239] By making the minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall 213 greater than or equal to 0.5 mm, the distance between the connector 25 and the first surface 21312 is greater, the connector 25 is accommodated in the deeper part of the second slot 21311, and the second slot 21311 has a better protection effect on the connector 25. By making the minimum distance between the first surface 21312 and the second surface 255 along the thickness direction of the wall 213 less than or equal to 1 mm, the distance between the connector 25 and the first surface 21312 is not too large, and the protrusion 2131 along the thickness direction of the wall 213 is not too high, which can not only reduce the occupation of the internal space of the battery 100 by the protrusion 2131, but also reduce the risk of the protrusion 2131 interfering with other components. Therefore, when 0.5 mm ≤ A ≤ 1 mm, it is possible to take into account both the protection of the connector 25 and the reduction of the risk of the protrusion 2131 interfering with other components.

[0240] Please refer to Fig.15 , Fig.16 , Fig.17 and Fig.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 slot 2421 is provided on the covering portion 242, and the connecting member 25 is clamped in the third slot 2421.

[0241] The body portion 241 is a 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 body portion 241 separates the first limiting portion 231 and the wall portion 213, and when there is no connecting member 25 connecting the first electrode terminal 23 and the wall portion 213, the body portion 241 can insulate and isolate the first electrode terminal 23 and the wall portion 213.

[0242] The covering portion 242 is a portion of the first insulating member 24 that covers the outer circumference of the first limiting portion 231. In the absence of the connecting member 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, thereby further improving the insulation isolation effect of the first electrode terminal 23 and the wall portion 213.

[0243] The third slot 2421 is an open slot disposed on the covering portion 242 , and the connecting member 25 is disposed in the first slot 2311 , the second slot 21311 and the third slot 2421 .

[0244] The main body 241 is located between the first limiting portion 231 and the wall portion 213, and the covering portion 242 covers the outer peripheral surface of the first limiting portion 231 to better separate the first limiting portion 231 and the wall portion 213, thereby reducing the risk of direct contact between the first limiting portion 231 and the wall portion 213. The third clamping groove 2421 is provided on the covering portion 242 to avoid the connecting member 25, so that the connecting member 25 is conveniently clamped in the first clamping groove 2311 and the second clamping groove 21311. By clamping the connecting member 25 in the first clamping groove 2311, the second clamping groove 21311 and the third clamping groove 2421, it is convenient to quickly locate the connecting member 25, and the connecting member 25 is electrically connected to the first limiting portion 231 and the protruding portion 2131, which is conducive to simplifying the installation.

[0245] Please refer to Fig.15 , Fig.16 , Fig.17 and Fig.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: B ≥ 0.2 mm.

[0246] The third surface 256 is the surface of the connecting member 25 that is closest to the bottom surface of the third slot 2421 along the thickness direction of the wall portion 213. Fig.18 ,exist Fig.18 In the illustrated embodiment, the third surface 256 is the lower surface of the connecting member 25 .

[0247] B represents 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. 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 is greater than or equal to 0.2 mm.

[0248] 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.

[0249] By making 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 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 increasing the life of the connector 25 and thereby increasing the number of cycles of the battery cell 20.

[0250] Optionally, 0.5mm≤B≤1mm.

[0251] 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.

[0252] By making 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 greater than or equal to 0.5 mm, the distance between the connector 25 and the bottom surface of the third slot 2421 is relatively large. When the first insulating member 24 moves, the first insulating member 24 is not likely to collide with the connector 25, and the connector 25 is not likely to be damaged. By making 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 less than or equal to 1 mm, the distance between the connector 25 and the bottom surface of the third slot 2421 is not too large, so that the covering portion 242 can still play a good separation effect. Therefore, when 0.5 mm ≤ B ≤ 1 mm, both the protection of the connector 25 and the covering effect of the covering portion 242 can be taken into account.

[0253] Please refer to Fig.17 , Fig.18 , Fig.19 and Fig. 20 , Fig.19 This is a schematic structural diagram of a connector 25 provided in some other embodiments of the present application. Fig. 20 The schematic diagram of the structure of the connector 25 (the third insulating member 254 covers the fuse 252 ) provided in some other embodiments of the present application. In some other embodiments, the connector 25 is a strip structure extending along a first direction, and the first direction intersects with the thickness direction of the wall 213 .

[0254] The connecting member 25 is a strip-shaped structure, and the connecting member 25 extends along the first direction. In other words, the length direction of the connecting member 25 is the first direction. Fig.17 , Fig.18 , Fig.19 and Fig. 20 The first direction may be the Y direction shown in the figure. The angle between the first direction and the thickness direction of the wall portion 213 may be an acute angle or a right angle. Fig.17 and Fig.18 In the embodiment shown in the figure, the first direction is perpendicular to the thickness direction of the wall portion 213.

[0255] By configuring the connector 25 as a strip structure extending in the first direction, it is convenient for the connector to overlap the protruding portion 2131 and the first limiting portion 231, so as to realize the electrical connection between the first electrode terminal 23 and the housing 21. In addition, in the embodiment where the connector 25 is clamped in the first clamping groove 2311 and the second clamping groove 21311, it is also possible to make the connector 25 clamped in the first clamping groove 2311 and the second clamping groove 21311 more convenient.

[0256] Please refer to Fig.17 , Fig.18 , Fig.19 and Fig. 20 In some embodiments, the connector 25 includes a first connection portion 251, a fuse portion 252, and a second connection portion 253 arranged along the first direction, the fuse portion 252 connects the first connection portion 251 and the second connection portion 253, and the first connection portion 251 and the second connection 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 connection portion 251, and the minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the second connection portion 253.

[0257] The first connection portion 251 is a portion of the connection member 25 connected to the first electrode terminal 23. Fig.17 and Fig.18 In the embodiment shown in the figure, the first connecting portion 251 is connected to the first limiting portion 231 of the first electrode terminal 23 .

[0258] The fuse part 252 is a component that plays a role of fuse protection in the connector 25. The fuse part 252 can be melted when the current passing through it is too large, thereby disconnecting the first connection part 251 and the second connection part 253, so as to disconnect the first electrode terminal 23 and the housing 21, and play a role of short circuit protection or overload protection.

[0259] The second connection portion 253 is a portion of the connector 25 for electrical connection with the housing 21. Fig.17 and Fig.18 In the embodiment shown in the figure, the second connecting portion 253 is connected to the protruding portion 2131 on the wall portion 213 .

[0260] 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.

[0261] The first connection part 251 is connected to the first limit part 231, the second connection part 253 is connected to the protrusion 2131, the fuse part 252 connects the first connection part 251 and the second connection part 253, and the minimum flow area of ​​the fuse part 252 is smaller than the minimum flow area of ​​the first connection part 251, and smaller than the minimum flow area of ​​the second connection part 253. When the current passing through the fuse part 252 is too large, the fuse part 252 will melt by itself, disconnecting the first connection part 251 and the second connection part 253 to play a protective role, reduce the risk of fire and explosion of the battery cell 20, and help improve the reliability of the battery cell 20.

[0262] In some embodiments, the battery cell 20 includes a plurality of connectors 25 , and the plurality of connectors 25 are distributed along the circumference of the terminal body 232 at intervals.

[0263] 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 .

[0264] By providing a plurality of connectors 25, the current capacity can be increased, so that the battery cell 20 can output a larger current. By distributing the plurality of connectors 25 at intervals along the circumference of the terminal body 232, the force around the terminal body 232 can be more uniform.

[0265] Please refer to Fig.21 , Fig. 22 , Fig.23 and Fig.24 , Fig.21 Exploded views of the wall portion 213 and the first electrode terminal 23 provided in some further embodiments of the present application. Fig. 22 Schematic top view of the wall portion 213 provided in some further embodiments of the present application. Fig.23 for Fig. 22 Cross-sectional view of the GG position. Fig.24 for Fig.23 In some other embodiments, the wall portion 213 is provided with a mounting hole 2132, 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 along the thickness direction of the wall portion 213, the first limiting portion 231 is arranged opposite to the wall portion 213. The connecting member 25 connects the wall portion 213 and the terminal body 232.

[0266] 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 .

[0267] The terminal body 232 is at least partially accommodated in the mounting hole 2132, and the first limiting portion 231 is connected to one end of the terminal body 232 and is arranged opposite to the wall portion 213 to prevent the terminal body 232 from escaping from the mounting hole 2132 in the direction from the first limiting portion 231 to the wall portion 213. The connecting member 25 connects the terminal body 232 and the wall portion 213, thereby realizing the electrical connection between the first electrode terminal 23 and the housing 21.

[0268] Please refer to Fig.21 , Fig. 22 , Fig.23 and Fig.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 .

[0269] The first limiting portion 231 is disposed along the thickness direction of the wall portion 213 at 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 .

[0270] 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 .

[0271] Please refer to Fig.21 , Fig. 22 , Fig.23 and Fig.24 In some embodiments, along the thickness direction of the wall portion 213, the connector 25 is located on the side of the wall portion 213 away from the electrode assembly 22. A first limiting groove 243 is formed on the side of the first insulating member 24 facing the wall portion 213, and the connector 25 is accommodated in the first limiting groove 243.

[0272] Along the thickness direction of the wall portion 213 , the connecting member 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 connecting member 25 is located between the first limiting portion 231 and the wall portion 213 .

[0273] The first limiting groove 243 is a groove structure provided on 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 away from the wall portion 213, and 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.

[0274] The size and shape of the first limiting groove 243 match the size and shape of the connecting member 25 , so that the connecting member 25 is limited in the first limiting groove 243 .

[0275] By setting the 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.

[0276] 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 .

[0277] The first limiting portion 231 is disposed on a side of the wall portion 213 facing the electrode assembly 22 along the thickness direction of the wall portion 213 , that is, the first limiting portion 231 is located on the inner side of the housing 21 .

[0278] 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 .

[0279] Optionally, the battery cell 20 includes a second insulating member 26, which is disposed on a side of the wall portion 213 facing the electrode assembly 22 along the thickness direction of the wall portion 213, and 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 a side of the wall portion 213 facing the electrode assembly 22, and a second limiting groove is provided on a side of the second insulating member 26 facing the wall portion 213, and the connector 25 is accommodated in the second limiting groove.

[0280] The second insulating member 26 is commonly called lower plastic, and is disposed inside the wall 213. The second insulating member 26 is used to insulate and isolate the electrode assembly 22 from the wall 213 to reduce the risk of short circuit. For example, the second insulating member 26 can be plastic, rubber, etc.

[0281] Along the thickness direction of the wall portion 213 , the connecting member 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 connecting member 25 is located between the first limiting portion 231 and the wall portion 213 .

[0282] 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, and 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.

[0283] 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.

[0284] 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 short circuit caused by contact between the wall portion 213 and the electrode assembly 22. By providing a second limiting groove on the second insulating member 26 and accommodating the connector 25 in the second limiting groove, not only can the connector 25 be limited, so that the connector 25 can stably connect the terminal body 232 and the wall portion 213, but also the connector 25 can be protected, reducing the risk of interference between the connector 25 and other components, and making the connector 25 less susceptible to the influence of the electrolyte, which is conducive to improving the life of the connector 25, thereby increasing the number of cycles of the battery cell 20.

[0285] Please refer to Fig.21 , Fig. 22 , Fig.23 , Fig.24 and Fig.25 In some embodiments, the connector 25 includes a first connection portion 251, a fuse portion 252, and a second connection portion 253. The fuse portion 252 connects the first connection portion 251 and the second connection portion 253. The first connection portion 251 and the second connection 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 connection portion 251, and the minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the second connection portion 253.

[0286] The first connection portion 251 is a portion of the connection member 25 connected to the first electrode terminal 23. Fig.21 , Fig. 22 , Fig.23 and Fig.24 In the embodiment shown in the figure, the first connection portion 251 is connected to the terminal body 232 of the first electrode terminal 23 .

[0287] The fuse part 252 is a component that plays a role of fuse protection in the connector 25. The fuse part 252 can be melted when the current passing through it is too large, thereby disconnecting the first connection part 251 and the second connection part 253, so as to disconnect the first electrode terminal 23 and the housing 21, and play a role of short circuit protection or overload protection.

[0288] The second connection portion 253 is a portion of the connector 25 for electrical connection with the housing 21. Fig.21 , Fig. 22 , Fig.23 and Fig.24 In the embodiment shown in the figure, the second connecting portion 253 is connected to the wall portion 213 of the housing 21.

[0289] The first connection part 251 is connected to the terminal body 232, the second connection part 253 is connected to the wall part 213, the fuse part 252 connects the first connection part 251 and the second connection part 253, and the minimum flow area of ​​the fuse part 252 is smaller than the minimum flow area of ​​the first connection part 251, and smaller than the minimum flow area of ​​the second connection part 253. When the current passing through the fuse part 252 is too large, the fuse part 252 will melt by itself, disconnecting the first connection part 251 and the second connection part 253 to play a protective role, reducing the risk of fire and explosion of the battery cell 20, which is conducive to improving the reliability of the battery cell 20.

[0290] Please refer to Fig.21 , Fig. 22 , Fig.23 , Fig.24 and Fig.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.

[0291] The first connection part 251 and the second connection part 253 are both annular structures. The second connection part 253 is located outside the first connection part 251 , that is, the inner diameter of the second connection part 253 is greater than the outer diameter of the first connection part 251 .

[0292] The first connection portion 251 has a central hole 2511, and the axis of the central hole 2511 coincides with the central axis of the second connection portion 253. The first connection portion 251 is sleeved on the outer side of the terminal body 232 through the central hole 2511.

[0293] By making the first connection part 251 and the second connection part 253 both annular, it is convenient to connect the first connection part 251 with the terminal body 232 and the second connection part 253 with the wall part 213, and the force around the terminal body 232 is uniform.

[0294] Please refer to Fig.21 , Fig. 22 , Fig.23 , Fig.24 and Fig.25 In some embodiments, the connector 25 includes a plurality of fuse portions 252 , and the plurality of fuse portions 252 are arranged at intervals along the circumference of the first connector 251 .

[0295] The connector 25 may include two fuse parts 252, three fuse parts 252, four fuse parts 252, or more than four fuse parts 252. Fig.25 ,exist Fig.25 In the illustrated embodiment, the connecting member 25 includes four fuse parts 252 .

[0296] 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 .

[0297] By providing a plurality of fuses 252, the current capacity can be increased, so that the battery cell 20 can output a larger current. By distributing the plurality of fuses 252 at intervals along the circumference of the first connection portion 251, the forces on the first connection portion 251 and the second connection portion 253 are more uniform.

[0298] Please refer to Fig.23 and Fig.24 In some embodiments, the electrode terminal further includes a second limiting portion 233, and the second limiting portion 233 and the first limiting portion 231 are respectively located on both sides of the wall portion 213. The second limiting portion 233 and the first limiting portion 231 are used to cooperate to limit the terminal body 232 from being separated from the mounting hole 2132.

[0299] The first limiting portion 231 and the second limiting portion 233 are respectively connected to the two ends of the terminal body 232. Along the thickness direction of the wall portion 213, the first limiting portion 231 and the second limiting portion 233 are arranged opposite to each other and are respectively located on both sides of the wall portion 213. 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.

[0300] 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 with each other to limit the terminal body 232 from being separated from the mounting hole 2132, which is conducive to 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.

[0301] In some embodiments, the connection member 25 includes a first connection portion 251, a fuse portion 252, and a second connection portion 253, the fuse portion 252 connects the first connection portion 251 and the second connection portion 253, and the first connection portion 251 and the second connection portion 253 are respectively connected to the first electrode terminal 23 and the housing 21. The minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the first connection portion 251, and the minimum flow area of ​​the fuse portion 252 is smaller than the minimum flow area of ​​the second connection portion 253.

[0302] The first connection part 251 is a part of the connection member 25 connected to the first electrode terminal 23, the fuse part 252 is a part of the connection member 25 that plays a role of fuse protection, and the second connection part 253 is a part of the connection member 25 that is used to be electrically connected to the housing 21. The fuse part 252 can be melted when the current passing through it is too large, thereby disconnecting the first connection part 251 and the second connection part 253, so as to disconnect the first electrode terminal 23 and the housing 21, and play a role of short circuit protection or overload protection.

[0303] The minimum flow area of ​​the first connection part 251 is the minimum cross-sectional area of ​​the first connection part 251 perpendicular to its extension direction. The minimum flow area of ​​the fuse part 252 is the minimum cross-sectional area of ​​the fuse part 252 perpendicular to its extension direction. The minimum flow area of ​​the second connection part 253 is the minimum cross-sectional area of ​​the second connection part 253 perpendicular to its extension direction. The minimum flow area of ​​the fuse part 252 is smaller than the minimum flow area of ​​the first connection part 251, and smaller than the minimum flow area of ​​the second connection part 253, so as to be blown in time when a short circuit occurs in the battery cell 20.

[0304] The first connection part 251 is connected to the first electrode terminal 23, the second connection part 253 is connected to the housing 21, the fuse part 252 connects the first connection part 251 and the second connection part 253, and the minimum flow area of ​​the fuse part 252 is smaller than the minimum flow area of ​​the first connection part 251, and smaller than the minimum flow area of ​​the second connection part 253. When the current passing through the fuse part 252 is too large, the fuse part 252 will melt by itself, disconnecting the first connection part 251 and the second connection part 253 to play a protective role, reduce the risk of fire and explosion of the battery cell 20, and help improve the reliability of the battery cell 20.

[0305] In some embodiments, the battery cell 20 includes a third insulating member 254 , and the third insulating member 254 is wrapped around the fuse portion 252 .

[0306] The third insulating member 254 is coated on the fuse part 252 to protect the fuse part 252. For example, the third insulating member 254 can be made of plastic, rubber, etc.

[0307] The third insulating member 254 is provided to cover the fuse part 252 , thereby protecting the fuse part 252 , reducing the risk of damage to the fuse part 252 , extending the life of the connector 25 , and facilitating increasing the number of cycles of the battery cell 20 .

[0308] In some embodiments, the minimum flow area of ​​the fuse 252 is S, which satisfies: 2 mm 2 ≤S≤20mm 2 .

[0309] 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 extension direction.

[0310] The minimum flow area of ​​the fuse 252 can be: S = 2 mm 2 , 4mm 2 、6mm 2 , 8mm 2 , 10mm 2 , 12mm 2 , 14mm 2 、16mm 2 、18mm 2 , 20mm 2 wait.

[0311] When S≥2mm 2 When S≤20mm, the fuse 252 has a larger flow area, so that the battery cell 20 can output a larger current. 2 When the current flow area of ​​the fuse part 252 is not too large, the fuse part 252 can be fused 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.

[0312] In some embodiments, the length of the fuse portion 252 is L, satisfying: 0.3 mm≤L≤5 mm.

[0313] L represents the length of the fuse portion 252 along its extension 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.

[0314] When L≥0.3mm, the fuse part 252 has a larger length and a higher resistance. When the battery cell 20 is short-circuited, a large amount of heat can be generated, so that the fuse part 252 is blown in time. When L≤5mm, the length of the fuse part 252 is not too long, and the resistance of the fuse part 252 is not too high, so that the battery cell 20 can output a larger current. Therefore, when 0.3mm≤L≤5mm, the battery cell 20 can output a larger current and can be blown in time when the battery cell 20 is short-circuited.

[0315] In some embodiments, the connection member 25 electrically connects the first electrode terminal 23 and the wall portion 213 .

[0316] By electrically connecting the first electrode terminal 23 and the wall 213 with the connector 25, the wall 213 can output the electrical energy of the electrode assembly 22. The battery 100 management system can be connected to the wall 213 to monitor the battery cell 20, greatly reducing the wiring difficulty.

[0317] In other embodiments, the connection member 25 electrically connects the first electrode terminal 23 and other walls of the housing 21 except the wall portion 213 .

[0318] Please refer to Fig.21 , Fig. 22 , Fig.23 and Fig.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-out portion 222, and the second electrode terminal 27 is electrically connected to the second electrode lead-out portion 222.

[0319] The second electrode lead-out portion 222 is a structure for leading out the electric energy of the main body or introducing the electric energy into the main body. The second electrode lead-out portion 222 includes a second pole tab 2221, which is the negative pole tab or the positive pole tab mentioned above, and the second pole tab 2221 can be directly connected to the second electrode terminal 27. In other embodiments, the second electrode lead-out portion 222 may also include other electrical connection components connected to the second pole tab 2221, for example, the second electrode lead-out portion 222 may also include a second current collecting member 2222, and the second current collecting member 2222 connects the second pole tab 2221 and the second electrode terminal 27 to guide the electric energy of the electrode assembly 22 to the second electrode terminal 27 or receive the electric energy introduced from the second electrode terminal 27.

[0320] The polarities of the first electrode tab 2211 and the second electrode tab 2221 are 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 polarities of the first electrode terminal 23 and the second electrode terminal 27 are 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.

[0321] The second electrode terminal 27 is insulated and installed on the wall 213, that is, the second electrode terminal 27 is insulated and isolated from the wall 213. Optionally, the battery cell 20 includes a fourth insulating member 28, which is disposed between the second electrode terminal 27 and the wall 213 to insulate and isolate the second electrode terminal 27 and the wall 213.

[0322] The housing 21 can be electrically connected to the first electrode lead-out portion 221, and the second electrode terminal 27 can be electrically connected to the second electrode lead-out portion 222. The housing 21 can serve as the positive electrode or negative electrode of the battery cell 20, and the second electrode terminal 27 can serve as the negative electrode or positive electrode of the battery cell 20 to output the electric energy of the battery cell 20. When both the first electrode lead-out portion 221 and the second electrode lead-out portion 222 are electrically connected to the housing 21, the battery cell 20 is short-circuited, and the connector 25 can be self-fused, so that the first electrode lead-out portion 221 is disconnected from the housing 21, thereby protecting the electrode assembly 22, reducing the risk of fire and explosion of the battery cell 20, and helping to improve the reliability of the battery cell 20.

[0323] Optionally, the second electrode terminal 27 includes a riveted portion 272 and a limiting portion 271 , the riveted portion 272 is connected to the second electrode lead-out portion 222 , the riveted portion 272 is penetrated through the wall portion 213 , and the limiting portion 271 is connected to one end of the riveted portion 272 , that is, the second electrode terminal 27 is riveted to the wall portion 213 .

[0324] In some embodiments, the first electrode terminal 23 is a positive electrode terminal.

[0325] The first electrode terminal 23 is electrically connected to the housing 21 through the connector 25 . The first electrode terminal 23 is a positive electrode terminal, so that the housing 21 is not easily corroded.

[0326] The embodiment of the present application further provides a battery 100 , and the battery 100 includes the above-mentioned battery cell 20 .

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

[0328] According to some embodiments of this application, please refer to Figure 3 to Figure 25 .

[0329] The embodiment of the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, a first electrode terminal 23, a first insulating member 24 and a connecting member 25. The housing 21 has a wall portion 213, and the electrode assembly 22 is accommodated in the housing 21. The electrode assembly 22 has a first electrode lead-out portion 221, the first electrode terminal 23 is arranged on the wall portion 213, the first electrode terminal 23 is electrically connected to the first electrode lead-out portion 221, and the first insulating member 24 is configured to separate the first electrode terminal 23 and the wall portion 213. The connecting member 25 electrically connects the first electrode terminal 23 and the housing 21, and the minimum flow area of ​​the connecting member 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 through the connecting member 25, so that the housing 21 can output the electric energy of the electrode assembly 22, and the battery 100 management system can be connected to the housing 21 of the battery cell 20, thereby realizing the monitoring of the battery cell 20, which greatly reduces the wiring difficulty. 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.

[0330] The wall portion 213 is provided with a mounting hole 2132. The first electrode terminal 23 includes a terminal body 232 and a first limiting portion 231. The terminal body 232 is at least partially accommodated in the mounting hole 2132. The first limiting portion 231 is arranged at one end of the terminal body 232. Along the thickness direction of the wall portion 213, the first limiting portion 231 is arranged opposite to the wall portion 213. The connecting member 25 connects the first limiting portion 231 and the wall portion 213. The terminal body 232 is at least partially accommodated in the mounting hole 2132. The first limiting portion 231 is connected to one end of the terminal body 232 and is arranged opposite to the wall portion 213 to prevent the terminal body 232 from escaping from the mounting hole 2132 in the direction from the first limiting portion 231 to the wall portion 213. The connecting member 25 connects the first limiting portion 231 and the wall portion 213, thereby realizing the electrical connection between the first electrode terminal 23 and the housing 21.

[0331] In some embodiments, along the thickness direction of the wall portion 213, the connector 25 is located between the first limit portion 231 and the wall portion 213. Along the thickness direction of the wall portion 213, the first limit portion 231 is disposed on the side of the wall portion 213 away from the electrode assembly 22. A first through hole 2411 is disposed on the first insulating member 24, and the first through hole 2411 penetrates the first insulating member 24 along the thickness direction of the wall portion 213, and the connector 25 is at least partially accommodated in the first through hole 2411. By providing the first through hole 2411 on the first insulating member 24, on the one hand, it is convenient to avoid the connector 25, so that the connector 25 is allowed to connect the first limit portion 231 and the wall portion 213. On the other hand, accommodating the connector 25 at least partially in the first through hole 2411 can protect the connector 25, further reduce the risk of interference between the connector 25 and other components, so that the connector 25 can stably connect the first limit portion 231 and the wall portion 213, which is conducive to improving the life of the battery cell 20.

[0332] In other embodiments, the connector 25 is located between the first limit portion 231 and the wall portion 213 along the thickness direction of the wall portion 213. The first limit portion 231 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 battery cell 20 includes a second insulating member 26, which is disposed on the side of the wall portion 213 facing the electrode assembly 22 along the thickness direction of the wall portion 213, and the second insulating member 26 is configured to insulate and isolate the wall portion 213 and the electrode assembly 22. The second insulating member 26 is provided with a second through hole 261, which penetrates the second insulating member 26 along the thickness direction of the wall portion 213, and the connector 25 is at least partially accommodated in the second through hole 261. By providing the second insulating member 26 to insulate and isolate the wall portion 213 and the electrode assembly 22, the risk of short circuit caused by contact between the wall portion 213 and the electrode assembly 22 is reduced. By providing the second through hole 261 on the second insulating member 26, on the one hand, it is convenient to avoid the connector 25, so that the connector 25 is allowed to connect the first limiting portion 231 and the wall portion 213. On the other hand, accommodating the connector 25 at least partially in the second through hole 261 can protect the connector 25, further reduce the risk of interference between the connector 25 and other components, and make the connector 25 less susceptible to the influence of the electrolyte, which is conducive to improving the life of the connector 25, thereby increasing the number of cycles of the battery cell 20.

[0333] In some other embodiments, the wall portion 213 is provided with a protrusion 2131, 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, and 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, so that the connector overlaps the protrusion 2131 and the first limiting portion 231 to achieve electrical connection between the first electrode terminal 23 and the housing 21.

[0334] In some other 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. The terminal body 232 is at least partially accommodated in the mounting hole 2132, and the first limiting portion 231 is arranged at one end of the terminal body 232. Along the thickness direction of the wall portion 213, the first limiting portion 231 is arranged opposite to the wall portion 213, and the connecting member 25 connects the wall portion 213 and the terminal body 232. Along the thickness direction of the wall portion 213, the first limiting portion 231 is arranged on the side of the wall portion 213 away from the electrode assembly 22. Along the thickness direction of the wall portion 213, the connecting member 25 is located on the side of the wall portion 213 away from the electrode assembly 22, and the first insulating member 24 is provided with a first limiting groove 243 on the side facing the wall portion 213, and the connecting member 25 is accommodated in the first limiting groove 243. By setting the 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.

[0335] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

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

2. The battery cell according to claim 1, characterized in that: The wall portion is provided with a mounting hole, the first electrode terminal comprises 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 arranged 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, characterized in that: 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, characterized in that: 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, characterized in that: The first insulating member is provided with a first through hole, the first through hole 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, characterized in that: 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, characterized in that: The battery cell includes a second insulating member, which is disposed 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, the second through hole 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 claim 3, characterized in that: The connecting member is an elastic element, and along the thickness direction of the wall portion, two ends of the connecting member abut against the first limiting portion and the wall portion respectively.

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

10. The battery cell according to claim 9, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 that is 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, characterized in that: 0.5mm≤A≤1mm.

15. The battery cell according to claim 12, characterized in that: The first insulating member comprises 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 peripheral surface of the first limiting portion; The covering portion is provided with a third slot, and the connecting member is clamped in the third slot.

16. The battery cell according to claim 15, characterized in that: 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, characterized in that: 0.5mm≤B≤1mm.

18. The battery cell according to claim 11, characterized in that: 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, characterized in that: 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 protruding 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.

20. The battery cell according to claim 2, characterized in that: 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, characterized in that: The wall portion is provided with a mounting hole, the first electrode terminal comprises 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 arranged 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The battery cell includes a second insulating member, which is arranged on a side of the wall portion facing the electrode assembly along the thickness direction of the wall portion, and is configured to insulate and isolate the wall portion and the electrode assembly. The connecting member is located on a side of the wall portion facing the electrode assembly, and 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 claim 22, characterized in that: 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, characterized in that: The first connection portion and the second connection portion are both ring-shaped, the first connection portion is located inside the second connection portion, the first connection portion has a center hole, and the terminal body is inserted through the center hole.

28. The battery cell according to claim 27, characterized in that: 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.

29. The battery cell according to claim 2, characterized in that: 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, characterized in that: 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, characterized in that: The battery cell includes a third insulating member, and the third insulating member is coated on the fuse part.

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

33. The battery cell according to claim 30, characterized in that: The length of the fuse portion is L, which satisfies: 0.3 mm ≤ L ≤ 5 mm.

34. The battery cell according to any one of claims 1 to 29, characterized in that: The connection member electrically connects the first electrode terminal and the wall portion.

35. The battery cell according to any one of claims 1 to 29, characterized in that: 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-out portion, and the second electrode terminal is electrically connected to the second electrode lead-out portion.

36. The battery cell according to any one of claims 1 to 29, characterized in that: The first electrode terminal is a positive electrode terminal.

37. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-36.

38. An electrical device, characterized in that: Comprising a battery cell according to any one of claims 1-36.

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