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 and a connector. The shell has a wall portion, the electrode assembly is accommodated in the shell, and the electrode assembly has a first pole ear. The first electrode terminal includes a terminal body, an insulator and a connector. The terminal body is electrically connected to the first pole ear, the connector is connected to the wall portion, the terminal body is at least partially located between the wall portion and the connector, and the insulator is at least partially located between the terminal body and the connector. The connector connects the connector and the terminal body to achieve electrical connection between the terminal body and the wall portion, and the connector is configured to be able to fuse the electrode assembly. The battery cell is connected to the terminal body and the connector by setting 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, which reduces the difficulty of wiring. When a short circuit occurs in the battery cell, the connector can fuse itself, thereby 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, which includes a shell, an electrode assembly, a first electrode terminal and a connector, wherein the shell has a wall portion; the electrode assembly is accommodated in the shell, and the electrode assembly has a first electrode tab; the first electrode terminal includes a terminal body, an insulator and a connector, the terminal body is electrically connected to the first electrode tab, the connector is connected to the wall portion, the terminal body is at least partially located between the wall portion and the connector, and the insulator is at least partially located between the terminal body and the connector; the connector connects the connector and the terminal body to achieve electrical connection between the terminal body and the wall portion, and the connector is configured to be able to provide fuse protection for the electrode assembly.

[0005] In the above technical solution, the battery cell installs the terminal body on the wall through a connector, which is simple and convenient to install. The insulator connects the terminal body and the connector. In the absence of a connector to connect the terminal body and the connector, the insulator can insulate the terminal body and the connector, so that the first pole ear is insulated from the wall. The battery cell connects the terminal body and the connector by setting a connector, so that the terminal body and the wall are electrically connected, so that the shell can output the electric energy of the electrode assembly, and the battery management system can be connected to the shell of the battery cell, so as to realize the monitoring of the battery cell, which greatly reduces the difficulty of wiring. In addition, 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, the terminal body includes a main body portion and a limiting portion, the limiting portion protrudes from the outer peripheral surface of the main body portion, the connecting body includes a first flange, and along the thickness direction of the wall portion, the limiting portion is at least partially located between the first flange and the wall portion, and the connecting member is located between the limiting portion and the first flange and connects the limiting portion and the first flange.

[0007] In the above technical solution, by arranging the connecting member between the limiting portion and the first flange, the risk of interference between the connecting member and other components is reduced, so that the connecting member can stably connect the limiting portion and the first flange, which is beneficial to improving the life of the battery cell.

[0008] As an optional technical solution of an embodiment of the present application, the insulator covers the first flange, and the insulator is provided with an accommodating cavity for accommodating the connecting piece.

[0009] In the above technical solution, by making the insulator cover the first flange, it is not only possible to protect the first flange, but also possible to better connect the first flange and the terminal body. The insulator is provided with a receiving cavity, and the connector is received in the receiving cavity and connects the first flange and the limiting portion to electrically connect the connector and the terminal body. By providing the receiving cavity on the insulator, on the one hand, it is convenient to avoid the connector, thereby allowing the connector to connect the limiting portion and the first flange. On the other hand, accommodating the connector in the receiving cavity can protect the connector, further reduce the risk of interference between the connector and other components, and enable the connector to stably connect the limiting portion and the first flange, which is beneficial to improving the life of the battery cell.

[0010] As an optional technical solution of an embodiment of the present application, the connecting body also includes a main body and a second flange, the first flange protrudes from a side of the main body close to the main body, the second flange protrudes from a side of the main body away from the main body, and the second flange is connected to the wall portion.

[0011] In the above technical solution, by providing the main body and the second flange, the second flange protrudes from the side of the main body away from the main body, so as to facilitate connection with the wall through the second flange. By making the first flange protrude from the side of the main body close to the main body, the first flange can be arranged opposite to the limiter, and the insulator covers the first flange and the limiter, so as to improve the connection strength between the terminal body and the connector.

[0012] 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 limiting portion and the first flange.

[0013] In the above technical solution, since the connecting piece is an elastic element, it can apply elastic force to the limiting portion and the first flange, so that the connecting piece can be stably contacted with the limiting portion and the first flange, allowing the connecting piece to be stably connected between the limiting portion and the first flange, which is beneficial to improving the life of the battery cell.

[0014] As an optional technical solution of the embodiment of the present application, the elastic element includes a spring.

[0015] 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.

[0016] 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 limiting part and the first flange, 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.

[0017] In the above technical solution, the first connection part is connected to the limit part, the second connection part is connected to the first flange, 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.

[0018] As an optional technical solution of an embodiment of the present application, the connecting body includes a second flange that is not covered by the insulator, the second flange is connected to the wall portion, and the connecting piece connects the terminal body and the second flange.

[0019] In the above technical solution, the second flange is not covered by the insulator, the second flange is connected to the wall portion, and the connecting member directly connects the terminal body and the second flange to electrically connect the first electrode terminal and the wall portion. There is no need to set a accommodating cavity inside the insulator, so that the insulator can better connect the terminal body and the connecting body.

[0020] As an optional technical solution of the embodiment of the present application, a receiving groove is provided on the outer surface of the insulator, and the connecting member is at least partially received in the receiving groove.

[0021] In the above technical solution, a receiving groove is provided on the outer surface of the insulator, and the connector is at least partially received in the receiving groove, thereby reducing the height of the connector protruding from the outer surface of the insulator, thereby reducing the risk of interference between the connector and other components, which is beneficial to improving the life of the battery cell.

[0022] As an optional technical solution of an embodiment of the present application, one end of the accommodating groove extends to the terminal body, and the other end of the accommodating groove extends to the second flange.

[0023] In the above technical solution, by extending one end of the accommodating groove to the terminal body and the other end of the accommodating groove to the second flange, the connector can be accommodated in the accommodating groove as much as possible, and the height of the connector protruding from the outer surface of the insulator is further reduced, so as to reduce the risk of interference between the connector and other components, which is beneficial to improving the life of the battery cell.

[0024] As an optional technical solution of an embodiment of the present application, along a direction perpendicular to the outer surface of the insulator, the part of the connector accommodated in the accommodating groove has a first surface closest to the outer surface of the insulator, and the minimum distance between the first surface and the outer surface of the insulator is A, satisfying: A≥0.2mm.

[0025] In the above technical solution, the connector is accommodated in the accommodating groove, and the minimum distance between the surface of the connector closest to the outer surface of the insulator and the outer surface of the insulator is greater than or equal to 0.2 mm. In this way, the accommodating groove can better protect the connector, reduce the risk of damage to the connector, and increase the life of the battery cell.

[0026] As an optional technical solution of the embodiment of the present application, 0.5mm≤A≤1mm.

[0027] In the above technical solution, by making the minimum distance between the first surface and the outer surface of the insulator in a direction perpendicular to the outer surface of the insulator greater than or equal to 0.5mm, the distance between the connector and the outer surface of the insulator is greater, the connector is accommodated in a deeper part of the accommodating groove, and the accommodating groove has a better protective effect on the connector. By making the minimum distance between the first surface and the outer surface of the insulator in a direction perpendicular to the outer surface of the insulator less than or equal to 1mm, the distance between the connector and the outer surface of the insulator is not too large, the depth of the accommodating groove is not too large, and the strength of the insulator connecting the terminal body and the connector is better. Therefore, when 0.5mm≤A≤1mm, it is possible to take into account both the protection of the connector and the connection strength of the terminal body and the connector.

[0028] As an optional technical solution of the embodiment of the present application, the terminal body is provided with a card slot, the card slot is connected to one end of the accommodating slot, and a part of the connecting member is clamped in the card slot.

[0029] In the above technical solution, by providing a slot on the terminal body, the connector is locked in the slot, so that the connection with the terminal body can be achieved, which is simple and convenient.

[0030] As an optional technical solution of an embodiment of the present application, the terminal body includes a main body portion and a limiting portion, the limiting portion protrudes from the outer peripheral surface of the main body portion, the connecting body includes a first flange and a main body portion, the first flange protrudes from a side of the main body portion close to the main body portion, the second flange protrudes from a side of the main body portion away from the main body portion, and along the thickness direction of the wall portion, the limiting portion is at least partially located between the first flange and the wall portion.

[0031] In the above technical solution, by providing the main body and the second flange, the second flange protrudes from the side of the main body away from the main body, so as to facilitate connection with the wall through the second flange. By making the first flange protrude from the side of the main body close to the main body, the first flange can be arranged opposite to the limiter, and the insulator covers the first flange and the limiter, so as to improve the connection strength between the terminal body and the connector.

[0032] As an optional technical solution of the embodiment of the present application, the first flange, the main body and the second flange are all annular.

[0033] In the above technical solution, the first flange, the main body and the second flange are all set to be ring-shaped, which is conducive to optimizing the force and reducing the stress.

[0034] 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 second flange, 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.

[0035] In the above technical solution, the first connection part is connected to the terminal body, the second connection part is connected to the second flange, 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.

[0036] As an optional technical solution of the embodiment of the present application, the terminal body is provided with a slot, and part of the connecting member is clamped in the slot.

[0037] In the above technical solution, by providing a slot on the terminal body, the connector is locked in the slot, so that the connection with the terminal body can be achieved, which is simple and convenient.

[0038] As an optional technical solution of an embodiment of the present application, the insulator is injection molded between the terminal body and the connector.

[0039] In the above technical solution, by injection molding the insulator between the terminal body and the connector, the integrity of the first electrode terminal is improved and the connection strength between the terminal body and the connector is higher.

[0040] 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 arranged at intervals along the circumference of the terminal body.

[0041] 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.

[0042] As an optional technical solution of an embodiment of the present application, the terminal body is entirely located on a side of the wall portion away from the electrode assembly.

[0043] In the above technical solution, by arranging the terminal body as a whole on the side of the wall away from the electrode assembly, it is convenient to realize the electrical connection between the first electrode tab and the first electrode terminal, and to facilitate the installation of the first electrode terminal.

[0044] 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 connecting body, 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.

[0045] In the above technical solution, the first connection part is connected to the terminal body, the second connection part is connected to the connection body, 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.

[0046] As an optional technical solution of the embodiment of the present application, the battery cell includes an insulating member, and the insulating member is coated on the fuse part.

[0047] In the above technical solution, an 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.

[0048] 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 .

[0049] 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 overcurrent 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.

[0050] 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.

[0051] 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.

[0052] 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 tab, the second electrode terminal is electrically connected to the second electrode tab.

[0053] In the above technical solution, the shell can be electrically connected to the first pole ear, the second electrode terminal can be electrically connected to the second pole ear, 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 electrical energy of the battery cell. When the first pole ear and the second pole ear are both electrically connected to the shell, the battery cell is short-circuited, and the connector can be automatically fused, so that the first pole ear 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.

[0054] As an optional technical solution of an embodiment of the present application, the first electrode terminal is a positive electrode terminal.

[0055] 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.

[0056] In a second aspect, an embodiment of the present application further provides a battery, which includes the above-mentioned battery cell.

[0057] 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

[0058] 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.

[0059] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0060] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0061] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0062] Figure 4 An exploded view of a battery cell provided for some embodiments of the present application;

[0063] Figure 5 An exploded view of a wall portion and a first electrode terminal provided in some embodiments of the present application;

[0064] Figure 6 A schematic top view of a wall portion provided for some embodiments of the present application;

[0065] Figure 7 for Figure 6 Sectional view at the AA position;

[0066] Figure 8 for Figure 7 A magnified view of position B in the middle;

[0067] Fig. 9 A schematic diagram of the structure of a connector provided in some embodiments of the present application;

[0068] Fig.10 A schematic diagram of the structure of a connector (insulating member covering a fuse portion) provided in some embodiments of the present application;

[0069] Fig.11 A schematic diagram of the structure of a wall portion provided in some embodiments of the present application;

[0070] Fig.12 An exploded view of a wall portion and a first electrode terminal provided in some other embodiments of the present application;

[0071] Fig.13 A schematic top view of a wall portion provided for some other embodiments of the present application;

[0072] Fig.14 for Fig.13 Cross-sectional view at the mid-CC position;

[0073] Fig.15 for Fig.14 Enlarged view of the D position in the middle;

[0074] Fig.16 A schematic diagram of the structure of a connector provided in some other embodiments of the present application;

[0075] Fig.17 A schematic diagram of the structure of a connecting piece (insulating piece covering the fuse part) provided in other embodiments of the present application.

[0076] Icons: 10-housing; 11-first part; 12-second part; 20-battery cell; 21-housing; 211-end cover; 212-shell; 213-wall; 22-electrode assembly; 221-first pole ear; 222-second pole ear; 23-first electrode terminal; 231-terminal body; 2311-slot; 2312-main body; 2313-limiting part; 232-insulator; 2321-accommodating cavity; 2322-accommodating groove; 233-connector; 2331-first flange; 2332-main body; 2333-second flange; 25-connector; 251-first connecting part; 252-fuse part; 253-second connecting part; 254-insulator; 27-second electrode terminal; 100-battery; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] The term "plurality" used in the present application refers to two or more (including two).

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.).

[0090] 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 NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0091] 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.

[0092] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0093] 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.).

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0099] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability can be selected.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0106] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0107] 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.

[0108] 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.

[0109] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0110] 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.

[0111] In some embodiments, the electrode assembly is a laminate structure.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0118] 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.

[0119] 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.

[0120] 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. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] In view of this, an embodiment of the present application provides a battery cell, the battery cell includes a shell, an electrode assembly, a first electrode terminal and a connector, the shell has a wall portion, and the electrode assembly is accommodated in the shell. The electrode assembly has a first pole ear, the first electrode terminal includes a terminal body, an insulator and a connector, the terminal body is electrically connected to the first pole ear, the connector is connected to the wall portion, the terminal body is at least partially located between the wall portion and the connector, and the insulator is at least partially located between the terminal body and the connector. The connector connects the connector and the terminal body to achieve electrical connection between the terminal body and the wall portion, and the connector is configured to be able to perform fuse protection on the electrode assembly.

[0130] The battery cell installs the terminal body on the wall through a connector, and the installation is simple and convenient. The insulator connects the terminal body and the connector. In the absence of a connector to connect the terminal body and the connector, the insulator can insulate the terminal body and the connector, so that the first pole ear is insulated from the wall. The battery cell connects the terminal body and the connector by setting a connector, so that the terminal body and the wall are electrically connected, so that the shell can output the electric 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. In addition, 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.

[0131] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0132] 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.

[0133] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0134] 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.

[0135] 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.

[0136] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, 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 may be a hollow structure with one end open, the first part 11 may 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 may 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 box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0137] 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.

[0138] 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.

[0139] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 3This 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 7 for Figure 6 Cross-sectional view at the AA position. Figure 8 for Figure 7 An enlarged view of position B in the figure. The embodiment of the present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22, a first electrode terminal 23 and a connector 25. The shell 21 has a wall portion 213, and the electrode assembly 22 is accommodated in the shell 21. The electrode assembly 22 has a first pole ear 221, and the first electrode terminal 23 includes a terminal body 231, an insulator 232 and a connector 233. The terminal body 231 is electrically connected to the first pole ear 221, and the connector 233 is connected to the wall portion 213. The terminal body 231 is at least partially located between the wall portion 213 and the connector 233, and the insulator 232 is at least partially located between the terminal body 231 and the connector 233. The connector 25 connects the connector 233 and the terminal body 231 to achieve electrical connection between the terminal body 231 and the wall portion 213, and the connector 25 is configured to be able to perform fuse protection on the electrode assembly 22.

[0140] The battery cell 20 refers to the smallest unit constituting the battery 100 .

[0141] 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.

[0142] 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.

[0143] 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.

[0144] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained 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 at both ends of the main body respectively. 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.

[0145] 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.

[0146] The first electrode terminal 23 is used to be electrically connected to the first pole tab 221 to input or output the electric energy of the battery cell 20. The first electrode terminal 23 can be directly connected to the first pole tab 221, for example, the first electrode terminal 23 is directly welded to the first pole tab 221. The first electrode terminal 23 can also be indirectly connected to the first pole tab 221, for example, the first electrode terminal 23 is connected to the first pole tab 221 through a first current collecting member. The first current collecting member can be a sheet-like structure, for example, the first current collecting member can be a transfer sheet.

[0147] In some embodiments, a mounting hole is provided on the wall portion 213, and the first electrode terminal 23 is provided on the wall portion 213 and covers the mounting hole. Optionally, the battery cell 20 further includes a seal, which is sealed between the first electrode terminal 23 and the wall portion 213 to reduce the risk of electrolyte flowing out of the battery cell 20.

[0148] The first electrode tab 221 can be a positive electrode tab or a negative electrode tab. When the first electrode tab 221 is a positive electrode tab, the first electrode terminal 23 is a positive electrode terminal. When the first electrode tab 221 is a negative electrode tab, the first electrode terminal 23 is a negative electrode terminal.

[0149] The terminal body 231 is the main part of the first electrode terminal 23 . The terminal body 231 is a conductive member. One end of the terminal body 231 is connected to the first electrode tab 221 , and the other end of the terminal body 231 can be electrically connected to other components to output the electrical energy of the battery cell 20 or input electrical energy into the battery cell 20 .

[0150] The connection body 233 is a connection structure for mounting the first electrode terminal 23 on the wall portion 213. Optionally, the connection body 233 is welded to the wall portion 213.

[0151] The insulator 232 connects the terminal body 231 and the connector 233. In the absence of the connector 25 connecting the terminal body 231 and the connector 233, the insulator 232 can insulate the terminal body 231 and the connector 233, so that the first pole tab 221 is insulated from the wall 213. Exemplarily, the insulator 232 can be plastic, rubber, etc.

[0152] The connector 25 is made of a conductive material and has conductivity. The connector 25 connects the terminal body 231 and the connector 233 so that the current can be transmitted to the connector 233 through the terminal body 231, thereby realizing the electrical connection between the first electrode tab 221 and the wall portion 213. The connector 25 is configured to provide fuse protection for the electrode assembly 22. The minimum flow area of ​​the connector 25 is the minimum flow area in the entire passage. The connector 25 can be fused 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.

[0153] The battery cell 20 installs the terminal body 231 on the wall 213 through the connector 233, and the installation is simple and convenient. The insulator 232 connects the terminal body 231 and the connector 233. In the absence of the connector 25 connecting the terminal body 231 and the connector 233, the insulator 232 can insulate and isolate the terminal body 231 and the connector 233, so that the first pole ear 221 is insulated from the wall 213. The battery cell 20 connects the terminal body 231 and the connector 233 by setting the connector 25, so that the terminal body 231 and the wall 213 are electrically connected, so that the shell 21 can output the electric energy of the electrode assembly 22, and the battery management system can be connected to the shell 21 of the battery cell 20, so as to realize the monitoring of the battery cell 20, which greatly reduces the wiring difficulty. In addition, the connector 25 has a fuse protection function. When the battery cell 20 is short-circuited, the connector 25 can be automatically fused, 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.

[0154] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, the terminal body 231 includes a body portion 2312 and a stopper portion 2313, and the stopper portion 2313 protrudes from the outer circumference of the body portion 2312. The connector 233 includes a first flange 2331, and along the thickness direction of the wall portion 213, the stopper portion 2313 is at least partially located between the first flange 2331 and the wall portion 213. The connector 25 is located between the stopper portion 2313 and the first flange 2331 and connects the stopper portion 2313 and the first flange 2331.

[0155] 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.

[0156] The body portion 2312 is a main body portion 2332 of the terminal body 231, and along the thickness direction of the wall portion 213, both ends of the body portion 2312 are not covered by the insulator 232. One end of the body portion 2312 is used to connect with the first pole ear 221, and the other end of the body portion 2312 is used to be electrically connected with other components to output the electric energy of the battery cell 20 or input the electric energy to the battery cell 20.

[0157] The limiting portion 2313 is a convex portion protruding from the outer peripheral surface of the main body 2312. Optionally, the insulator 232 is covered on the limiting portion 2313, so that the insulator 232 is connected to the terminal body 231.

[0158] The first flange 2331 is a flange structure on the connecting body 233. Optionally, the insulator 232 is coated on the first flange 2331 so that the insulator 232 is connected to the first flange 2331.

[0159] Along the thickness direction of the wall portion 213 , the limiting portion 2313 and the first flange 2331 are arranged opposite to each other, and a part or all of the limiting portion 2313 is located between the first flange 2331 and the wall portion 213 .

[0160] Along the thickness direction of the wall portion 213, a portion of the connector 25 may be located between the limiting portion 2313 and the first flange 2331, and a portion of the connector 25 may be located outside the limiting portion 2313 and the first flange 2331. Along the thickness direction of the wall portion 213, the connector 25 may also be completely located between the limiting portion 2313 and the first flange 2331. The connector 25 connects the limiting portion 2313 and the first flange 2331 to achieve electrical connection between the terminal body 231 and the connector 233.

[0161] By arranging the connector 25 between the limiting portion 2313 and the first flange 2331 , the risk of interference between the connector 25 and other components is reduced, so that the connector 25 can stably connect the limiting portion 2313 and the first flange 2331 , which is beneficial to improving the life of the battery cell 20 .

[0162] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, the insulator 232 covers the first flange 2331 , and the insulator 232 is provided with a receiving cavity 2321 for receiving the connector 25 .

[0163] The insulator 232 may cover a portion of the first flange 2331 , or the insulator 232 may completely cover the first flange 2331 .

[0164] The insulator 232 is provided with a receiving cavity 2321, and the connector 25 is received in the receiving cavity 2321. Along the thickness direction of the wall portion 213, one end of the receiving cavity 2321 extends to the limiting portion 2313 to allow the connector 25 to be connected to the limiting portion 2313, and the other end of the receiving cavity 2321 extends to the first flange 2331 to allow the connector 25 to be connected to the first flange 2331.

[0165] By making the insulator 232 cover the first flange 2331, not only can the first flange 2331 be protected, but also the first flange 2331 and the terminal body 231 can be better connected. The insulator 232 is provided with a receiving cavity 2321, and the connector 25 is received in the receiving cavity 2321 and connects the first flange 2331 and the limiting portion 2313 to electrically connect the connector 233 and the terminal body 231. By providing the receiving cavity 2321 on the insulator 232, on the one hand, it is convenient to avoid the connector 25, so that the connector 25 is allowed to connect the limiting portion 2313 and the first flange 2331. On the other hand, accommodating the connector 25 in the receiving cavity 2321 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 limiting portion 2313 and the first flange 2331, which is conducive to improving the life of the battery cell 20.

[0166] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, the connector 233 further includes a main body 2332 and a second flange 2333 , wherein the first flange 2331 protrudes from a side of the main body 2332 close to the body 2312 , and the second flange 2333 protrudes from a side of the main body 2332 away from the body 2312 . The second flange 2333 is connected to the wall 213 .

[0167] The main body 2332 connects the first flange 2331 and the second flange 2333 . The first flange 2331 and the second flange 2333 protrude in opposite directions. The first flange 2331 protrudes toward the terminal body 231 , and the second flange 2333 protrudes away from the terminal body 231 .

[0168] By providing the main body 2332 and the second flange 2333, the second flange 2333 protrudes from the side of the main body 2332 away from the main body 2312, so as to facilitate connection with the wall 213 through the second flange 2333. By making the first flange 2331 protrude from the side of the main body 2332 close to the main body 2312, the first flange 2331 can be arranged opposite to the limiting portion 2313, and the insulator 232 is covered on the first flange 2331 and the limiting portion 2313, so as to improve the connection strength between the terminal body 231 and the connecting body 233.

[0169] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8In some embodiments, the connecting member 25 is an elastic element, and along the thickness direction of the wall portion 213 , two ends of the connecting member 25 abut against the limiting portion 2313 and the first flange 2331 respectively.

[0170] The elastic element is an element capable of elastic deformation. The elastic element may be a spring, a reed, etc. The connector 25 is an elastic element, and along the thickness direction of the wall portion 213, two ends of the elastic element abut against the limit portion 2313 and the first flange 2331 respectively. The elastic element exerts elastic force on both the limit portion 2313 and the first flange 2331.

[0171] Since the connector 25 is an elastic element, it can apply elastic force to the limiting portion 2313 and the first flange 2331, so that the connector 25 can be stably in contact with the limiting portion 2313 and the first flange 2331, allowing the connector 25 to be stably connected between the limiting portion 2313 and the first flange 2331, which is beneficial to improving the life of the battery cell 20.

[0172] Please refer to Figure 7 , Figure 8 , Fig. 9 and Fig.10 , Fig. 9 A schematic diagram of the structure of a connector 25 provided in some embodiments of the present application. Fig.10 A schematic diagram of the structure of a connecting member 25 (insulating member 254 covering fuse portion 252) provided in some embodiments of the present application. In some embodiments, the elastic element includes a spring.

[0173] 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 limiting portion 2313 , and the other end of the coil spring abuts against the first flange 2331 .

[0174] 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.

[0175] Please refer to Figure 7 , Figure 8 , Fig. 9 and Fig.10 In some embodiments, the spring 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 limiting portion 2313 and the first flange 2331. 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.

[0176] The first connecting portion 251 is the portion of the connecting member 25 that is connected to the terminal body 231. Figure 5 , Figure 6 , Figure 7 and Figure 8 In the embodiment shown in the figure, the first connecting portion 251 is connected to the limiting portion 2313 of the terminal body 231 .

[0177] 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 wall part 213, and play a role of short circuit protection or overload protection.

[0178] The second connection portion 253 is a portion of the connector 25 for electrically connecting to the connector 233. Figure 5 , Figure 6 , Figure 7 and Figure 8 In the embodiment shown in the figure, the second connecting portion 253 is connected to the first flange 2331 of the connecting body 233 .

[0179] 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.

[0180] The first connection part 251 is connected to the limiting part 2313, the second connection part 253 is connected to the first flange 2331, 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.

[0181] Please refer to Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 , Fig.11 A schematic diagram of the structure of the wall portion 213 provided in some embodiments of the present application. Fig.12 Exploded views of the wall portion 213 and the first electrode terminal 23 provided in some other embodiments of the present application. Fig.13Schematic top view of the wall portion 213 provided in some other embodiments of the present application. Fig.14 for Fig.13 Cross-sectional view at the CC position. Fig.15 for Fig.14 In some other embodiments, the connector 233 includes a second flange 2333 that is not covered by the insulator 232 , the second flange 2333 is connected to the wall 213 , and the connector 25 connects the terminal body 231 and the second flange 2333 .

[0182] The second flange 2333 is a portion of the connector 233 not covered by the insulator 232 and is connected to the wall 213 to mount the first electrode terminal 23 on the wall 213. The connector 25 connects the terminal body 231 and the second flange 2333 to achieve electrical connection between the first electrode tab 221 and the wall 213.

[0183] The second flange 2333 is not covered by the insulator 232. The second flange 2333 is connected to the wall portion 213. The connecting piece 25 directly connects the terminal body 231 and the second flange 2333 to electrically connect the first electrode terminal 23 and the wall portion 213. There is no need to set a accommodating cavity 2321 inside the insulator 232, so that the insulator 232 can better connect the terminal body 231 and the connecting body 233.

[0184] Please refer to Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 In some embodiments, a receiving groove 2322 is provided on the outer surface of the insulator 232 , and the connecting member 25 is at least partially received in the receiving groove 2322 .

[0185] The receiving groove 2322 is a groove structure provided on the outer surface of the insulator 232. The receiving groove 2322 is recessed from the outer surface of the insulator 232 toward the center of the insulator 232. The connector 25 can be partially received in the receiving groove 2322, or the connector 25 can be completely received in the receiving groove 2322.

[0186] By setting a receiving groove 2322 on the outer surface of the insulator 232, the connector 25 is at least partially received in the receiving groove 2322, and the height of the connector 25 protruding from the outer surface of the insulator 232 is reduced, so as to reduce the risk of interference between the connector 25 and other components, which is beneficial to improving the life of the battery cell 20.

[0187] Please refer to Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15In some embodiments, one end of the accommodating groove 2322 extends to the terminal body 231 , and the other end of the accommodating groove 2322 extends to the second flange 2333 .

[0188] The two ends of the accommodating groove 2322 extend to the terminal body 231 and the second flange 2333 respectively. The connecting member 25 is accommodated in the accommodating groove 2322. One end of the connecting member 25 extends out from one end of the accommodating groove 2322 and is connected to the terminal body 231. The other end of the connecting member 25 extends out from the other end of the accommodating groove 2322 and is connected to the second flange 2333.

[0189] By extending one end of the accommodating groove 2322 to the terminal body 231 and the other end of the accommodating groove 2322 to the second flange 2333, the connector 25 can be accommodated in the accommodating groove 2322 as much as possible, and the height of the connector 25 protruding from the outer surface of the insulator 232 is further reduced, so as to reduce the risk of interference between the connector 25 and other components, which is beneficial to improving the life of the battery cell 20.

[0190] Please refer to Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 In some embodiments, along a direction perpendicular to the outer surface of the insulator 232, the portion of the connector 25 accommodated in the accommodating groove 2322 has a first surface closest to the outer surface of the insulator 232, and the minimum distance between the first surface and the outer surface of the insulator 232 is A, satisfying: A ≥ 0.2 mm.

[0191] The depth of the receiving groove 2322 is greater than the thickness of the connecting member 25 , so that the connecting member 25 , except for the portion connected to the terminal body 231 and the portion connected to the second flange 2333 , can be completely accommodated in the receiving groove 2322 .

[0192] The first surface is the surface of the portion of the connector 25 received in the receiving groove 2322 that is closest to the outer surface of the insulator 232 in a direction perpendicular to the outer surface of the insulator 232. The first surface is the surface of the connector 25 that is away from the bottom surface of the receiving groove 2322.

[0193] A represents the minimum distance between the first surface and the outer surface of the insulator 232 in a direction perpendicular to the outer surface of the insulator 232. The minimum distance between the first surface and the outer surface of the insulator 232 in a direction perpendicular to the outer surface of the insulator 232 is greater than or equal to 0.2 mm.

[0194] The minimum distance between the first surface and the outer surface of the insulator 232 in a direction perpendicular to the outer surface of the insulator 232 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.

[0195] The connector 25 is accommodated in the accommodating groove 2322, and the minimum distance between the surface of the connector 25 closest to the outer surface of the insulator 232 and the outer surface of the insulator 232 is greater than or equal to 0.2 mm. In this way, the accommodating groove 2322 can better protect the connector 25, reduce the risk of damage to the connector 25, and increase the life of the battery cell 20.

[0196] Optionally, 0.5mm≤A≤1mm.

[0197] The minimum distance between the first surface and the outer surface of the insulator 232 in a direction perpendicular to the outer surface of the insulator 232 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.

[0198] By making the minimum distance between the first surface and the outer surface of the insulator 232 in a direction perpendicular to the outer surface of the insulator 232 greater than or equal to 0.5 mm, the distance between the connector 25 and the outer surface of the insulator 232 is greater, the connector 25 is accommodated in the deeper part of the accommodating groove 2322, and the accommodating groove 2322 has a better protection effect on the connector 25. By making the minimum distance between the first surface and the outer surface of the insulator 232 in a direction perpendicular to the outer surface of the insulator 232 less than or equal to 1 mm, the distance between the connector 25 and the outer surface of the insulator 232 is not too large, the depth of the accommodating groove 2322 is not too large, and the strength of the insulator 232 connecting the terminal body 231 and the connector 233 is better. Therefore, when 0.5 mm ≤ A ≤ 1 mm, both the protection of the connector 25 and the connection strength of the terminal body 231 and the connector 233 can be taken into account.

[0199] Please refer to Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 In some embodiments, the terminal body 231 is provided with a slot 2311 , which is connected to one end of the receiving slot 2322 . A portion of the connector 25 is locked in the slot 2311 .

[0200] The card slot 2311 is an open slot provided in the terminal body 231. Along the thickness direction of the wall portion 213, the card slot 2311 has a first opening away from the wall portion 213, and the first opening is used for the connector 25 to be inserted into the card slot 2311. The card slot 2311 also has a second opening facing the receiving groove 2322, and the second opening is connected to one end of the receiving groove 2322. A part of the connector 25 is received in the receiving groove 2322, and a part of the connector 25 is locked in the card slot 2311.

[0201] By providing a slot 2311 on the terminal body 231 and locking the connector 25 in the slot 2311 , the connection with the terminal body 231 can be achieved, which is simple and convenient.

[0202] Please refer to Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 In some embodiments, the terminal body 231 includes a main body portion 2312 and a limiting portion 2313, the limiting portion 2313 protrudes from the outer peripheral surface of the main body portion 2312, the connecting body 233 includes a first flange 2331 and a main body portion 2332, the first flange 2331 protrudes from a side of the main body portion 2332 close to the main body portion 2312, the second flange 2333 protrudes from a side of the main body portion 2332 away from the main body portion 2312, and along the thickness direction of the wall portion 213, the limiting portion 2313 is at least partially located between the first flange 2331 and the wall portion 213.

[0203] By providing the main body 2332 and the second flange 2333, the second flange 2333 protrudes from the side of the main body 2332 away from the main body 2312, so as to facilitate connection with the wall 213 through the second flange 2333. By making the first flange 2331 protrude from the side of the main body 2332 close to the main body 2312, the first flange 2331 can be arranged opposite to the limiting portion 2313, and the insulator 232 is covered on the first flange 2331 and the limiting portion 2313, so as to improve the connection strength between the terminal body 231 and the connecting body 233.

[0204] Please refer to Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 In some embodiments, the first flange 2331, the main body 2332 and the second flange 2333 are all annular.

[0205] The first flange 2331 and the second flange 2333 are both annular flanges, and the main body 2332 is also an annular structure. Optionally, the main body 2332 is in a conical cylinder shape.

[0206] Setting the first flange 2331, the main body 2332 and the second flange 2333 in a ring shape is beneficial to optimizing the force and reducing the stress.

[0207] Please refer to Fig.14 , Fig.15 , Fig.16 and Fig.17 , Fig.16 Schematic diagram of the structure of the connecting member 25 provided in some other embodiments of the present application. Fig.17 A schematic diagram of the structure of a connector 25 (insulating member 254 covering fuse part 252) provided in other embodiments of the present application. In other embodiments, the connector 25 includes a first connector 251, a fuse part 252, and a second connector 253, the fuse part 252 connects the first connector 251 and the second connector 253, the first connector 251 and the second connector 253 are respectively connected to the terminal body 231 and the second flange 2333, the minimum flow area of ​​the fuse part 252 is smaller than the minimum flow area of ​​the first connector 251, and the minimum flow area of ​​the fuse part 252 is smaller than the minimum flow area of ​​the second connector 253.

[0208] The first connecting portion 251 is the portion of the connecting member 25 that is connected to the terminal body 231. Fig.12 , Fig.13 , Fig.14 and Fig.15 In the embodiment shown in the figure, the first connecting portion 251 is connected to the terminal body 231 .

[0209] 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 wall part 213, and play a role of short circuit protection or overload protection.

[0210] The second connection portion 253 is a portion of the connector 25 for electrically connecting to the connector 233. Fig.12 , Fig.13 , Fig.14 and Fig.15 In the embodiment shown in the figure, the second connecting portion 253 is connected to the second flange 2333 of the connecting body 233.

[0211] The first connection part 251 is connected to the terminal body 231, the second connection part 253 is connected to the second flange 2333, 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.

[0212] In some embodiments, the connector 25 is a strip structure, wherein the first connector 251 and the fuse 252 are linear structures, and the second connector 253 is an arc structure, wherein the first connector 251 is connected to one end of the fuse 252, and the second connector 253 is connected to the other end of the fuse 252, so as to adapt to the shape of the insulator 232.

[0213] By configuring the connector 25 as a strip structure, it is convenient for the connector to overlap the terminal body 231 and the second flange 2333 , so as to achieve electrical connection between the terminal body 231 and the connector 233 .

[0214] Fig.12 , Fig.13 , Fig.14 and Fig.15 In some embodiments, the terminal body 231 is provided with a slot 2311 , and a portion of the connector 25 is locked in the slot 2311 .

[0215] By providing a slot 2311 on the terminal body 231 and locking the connector 25 in the slot 2311 , the connection with the terminal body 231 can be achieved, which is simple and convenient.

[0216] In some embodiments, the insulator 232 is injection molded between the terminal body 231 and the connector 233 .

[0217] In the embodiment where the connector 25 is disposed between the limiting portion 2313 and the first flange 2331 , the terminal body 231 , the connector 233 and the connector 25 may be injection molded together, thereby forming an insulator 232 between the terminal body 231 and the connector 233 .

[0218] By injection molding the insulator 232 between the terminal body 231 and the connector 233 , the integrity of the first electrode terminal 23 is improved, and the connection strength between the terminal body 231 and the connector 233 is higher.

[0219] In some embodiments, the battery cell 20 includes a plurality of connectors 25 , and the plurality of connectors 25 are spaced apart along the circumference of the terminal body 231 .

[0220] The battery cell 20 may include two connectors 25 , three connectors 25 , four connectors 25 , or more than four connectors 25 . The plurality of connectors 25 are distributed around the terminal body 231 .

[0221] 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 231, the force around the terminal body 231 can be more uniform.

[0222] In some embodiments, the terminal body 231 is entirely located on a side of the wall portion 213 facing away from the electrode assembly 22 .

[0223] The wall portion 213 is provided with a mounting hole, and the first electrode terminal 23 is provided on the wall portion 213 and covers the mounting hole. The terminal body 231 is provided on a side of the wall portion 213 away from the electrode assembly 22, and the terminal body 231 is completely located outside the mounting hole.

[0224] By integrally disposing the terminal body 231 on the side of the wall portion 213 away from the electrode assembly 22 , it is convenient to electrically connect the first electrode tab 221 to the first electrode terminal 23 , and to install the first electrode terminal 23 .

[0225] 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 231 and the connector 233. 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.

[0226] The first connection part 251 is a part of the connection member 25 connected to the terminal body 231, 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 connection body 233. 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.

[0227] 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.

[0228] The first connection part 251 is connected to the terminal body 231, the second connection part 253 is connected to the connection body 233, 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.

[0229] Please refer to Fig.14 , Fig.15 , Fig.16 and Fig.17 In some embodiments, the battery cell 20 includes an insulating member 254 , and the insulating member 254 is coated on the fuse portion 252 .

[0230] The insulating member 254 is coated on the fuse part 252 to protect the fuse part 252. For example, the insulating member 254 can be made of plastic, rubber, etc.

[0231] By providing an insulating member 254 to cover the fuse part 252 , the fuse part 252 is protected, the risk of the fuse part 252 being damaged is reduced, the life of the connector 25 is extended, and the number of cycles of the battery cell 20 is increased.

[0232] In some embodiments, the minimum flow area of ​​the fuse 252 is S, which satisfies: 2 mm 2 ≤S≤20mm 2 .

[0233] 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.

[0234] The minimum flow area of ​​the fuse 252 can be: S = 2 mm 2 , 4mm 2 , 6mm 2 , 8mm 2 , 10mm2 , 12mm 2 , 14mm 2 、16mm 2 、18mm 2 , 20mm 2 wait.

[0235] 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.

[0236] In some embodiments, the length of the fuse portion 252 is L, satisfying: 0.3 mm ≤ L ≤ 5 mm.

[0237] 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.

[0238] 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.

[0239] Please refer to Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 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 tab 222, and the second electrode terminal 27 is electrically connected to the second electrode tab 222.

[0240] The second electrode terminal 27 is used to be electrically connected to the second pole tab 222 to input or output the electric energy of the battery cell 20. The second electrode terminal 27 can be directly connected to the second pole tab 222, for example, the second electrode terminal 27 is directly welded to the second pole tab 222. The second electrode terminal 27 can also be indirectly connected to the second pole tab 222, for example, the second electrode terminal 27 is connected to the second pole tab 222 through a second current collecting member. The second current collecting member can be a sheet-like structure, for example, the second current collecting member can be a transfer sheet.

[0241] The polarity of the first electrode tab 221 and the second electrode tab 222 is opposite. For example, when the first electrode tab 221 is a positive electrode tab, the second electrode tab 222 is a negative electrode tab. When the first electrode tab 221 is a negative electrode tab, the second electrode tab 222 is a positive electrode tab. Similarly, the polarity of the first electrode terminal 23 and the second electrode terminal 27 is opposite. For example, when the first electrode terminal 23 is a positive electrode terminal, the second electrode terminal 27 is a negative electrode terminal. When the first electrode terminal 23 is a negative electrode terminal, the second electrode terminal 27 is a positive electrode terminal.

[0242] The second electrode terminal 27 is insulated and installed on the wall portion 213 , that is, the second electrode terminal 27 is insulated and isolated from the wall portion 213 , and the second electrode tab 222 is disconnected from the wall portion 213 .

[0243] The housing 21 can be electrically connected to the first pole ear 221, the second electrode terminal 27 can be electrically connected to the second pole ear 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 pole ear 221 and the second pole ear 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 pole ear 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.

[0244] In some embodiments, the structure of the second electrode terminal 27 is the same as that of the first electrode terminal 23 . The structure of the second electrode terminal 27 can refer to the structure of the first electrode terminal 23 , which will not be described in detail herein.

[0245] In other embodiments, the second electrode terminal 27 includes a riveted portion and a stopper portion, the riveted portion is connected to the second pole ear 222 , the riveted portion passes through the wall portion 213 , and the stopper portion is connected to one end of the riveted portion, that is, the second electrode terminal 27 is riveted to the wall portion 213 .

[0246] In some embodiments, the first electrode terminal 23 is a positive electrode terminal.

[0247] 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.

[0248] In some embodiments, the housing 21 includes a shell 212 and an end cover 211 , wherein the shell 212 has an opening, and the end cover 211 is connected to the shell 212 and closes the opening. The end cover 211 is a wall portion 213 , or the shell 212 includes the wall portion 213 .

[0249] In some embodiments, the housing 21 may include a shell 212 and an end cap 211, wherein the shell 212 has an opening formed inside thereof, and the accommodating cavity 2321 is used to accommodate the electrode assembly 22, and the end cap 211 closes the opening, and the end cap 211 is a wall portion 213. When the end cap 211 is a wall portion 213, the first electrode terminal 23 and the second electrode terminal 27 are both disposed on the end cap 211.

[0250] In other embodiments, the battery cell 20 may also be other structures. For example, the shell 212 includes an integrally formed side wall and bottom wall, that is, the shell 212 is manufactured using an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding. In other words, the side wall and bottom wall of the shell 212 are an integral structure.

[0251] The housing 212 includes a wall portion 213, that is, the wall portion 213 is a wall of the housing 212. Exemplarily, the wall portion 213 is a bottom wall of the housing 212 disposed opposite to the end cap 211 in the thickness direction of the wall portion 213. When the bottom wall is the wall portion 213, the first electrode terminal 23 and the second electrode terminal 27 are both disposed on the bottom wall. Of course, in other embodiments, the wall portion 213 may also be a side wall of the housing 212. When the side wall is the wall portion 213, the first electrode terminal 23 and the second electrode terminal 27 are both disposed on the side wall.

[0252] It should be noted that the structure of the battery cell 20 can be various. In some embodiments, the outer shell 21 may include a shell 212 and two end covers 211. The shell 212 has an accommodating cavity 2321 formed inside. The accommodating cavity 2321 is used to accommodate the electrode assembly 22. The shell 212 has openings formed at both ends in the thickness direction of the wall portion 213, and the two openings are connected to the accommodating cavity 2321. The two end covers 211 respectively close the two openings, and one of the two end covers 211 is the wall portion 213.

[0253] The shell 212 of the outer shell 21 is provided with openings at both ends in the thickness direction of the wall portion 213, and the two end covers 211 respectively close the two openings. The wall portion 213 is one of the two end covers 211. The battery cell 20 adopting this structure is convenient for assembling the battery cell 20 from both ends of the shell 212, which is beneficial to reducing the manufacturing difficulty and assembly difficulty of the battery cell 20.

[0254] According to some embodiments of the present application, the material of the wall portion 213 includes steel.

[0255] Exemplarily, the material of the wall portion 213 may be carbon steel, alloy steel, stainless steel, or the like.

[0256] It should be noted that the material of the wall portion 213 includes steel. If the wall portion 213 is the end cover 211 of the outer shell 21, the material of the end cover 211 is steel; if the wall portion 213 is a wall in the shell 212, the material of the shell 212 is steel.

[0257] In this embodiment, the material of the wall portion 213 is set to steel. Since steel has the characteristic of high strength, the wall portion 213 made of steel has better strength, so that when the bursting pressure of the battery cell 20 is constant, the wall portion 213 can be made thinner, which is beneficial to saving the space occupied by the wall portion 213.

[0258] In some embodiments, the steel material is carbon steel or stainless steel.

[0259] Illustratively, the carbon steel may be low carbon steel, medium carbon steel or high carbon steel.

[0260] In this embodiment, carbon steel or stainless steel is used as the material of the wall portion 213 , which has low cost and is easy to manufacture.

[0261] In some embodiments, the material of the wall portion 213 includes aluminum alloy.

[0262] It can be understood that if the wall portion 213 is the end cover 211 , the end cover 211 may be made of aluminum alloy; if the wall portion 213 is the wall in the shell 212 , the shell 212 may be made of aluminum alloy.

[0263] Aluminum alloy has the characteristics of light weight and good ductility, and is easier to process on the wall portion 213.

[0264] In some embodiments, the aluminum alloy includes the following components in mass percentage: aluminum ≥ 99.6%, copper ≤ 0.05%, iron ≤ 0.35%, magnesium ≤ 0.03%, manganese ≤ 0.03%, silicon ≤ 0.25%, titanium ≤ 0.03%, vanadium ≤ 0.05%, zinc ≤ 0.05%, and other single elements ≤ 0.03%.

[0265] This aluminum alloy belongs to the third series aluminum. It has lower hardness, better forming ability, reduces processing difficulty, and is conducive to improving processing accuracy.

[0266] In some embodiments, the aluminum alloy includes the following components in mass percentage: aluminum ≥ 96.7%, 0.05% ≤ copper ≤ 0.2%, iron ≤ 0.7%, manganese ≤ 1.5%, silicon ≤ 0.6%, zinc ≤ 0.1%, other single element components ≤ 0.05%, and the total composition of other elements ≤ 0.15%.

[0267] This aluminum alloy belongs to the fifth series aluminum. The wall portion 213 made of this aluminum alloy has higher hardness, greater strength, and good anti-destruction ability.

[0268] The embodiment of the present application further provides a battery 100 , and the battery 100 includes the above-mentioned battery cell 20 .

[0269] The embodiment of the present application further provides an electrical device, which includes the above-mentioned battery cell 20.

[0270] According to some embodiments of this application, please refer to Figure 3 to Figure 17 .

[0271] 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 and a connector 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 pole ear 221, and the first electrode terminal 23 includes a terminal body 231, an insulator 232 and a connector 233. The terminal body 231 is electrically connected to the first pole ear 221, the insulator 232 connects the terminal body 231 and the connector 233, and the connector 233 is connected to the wall portion 213. The connector 25 connects the connector 233 and the terminal body 231 to achieve electrical connection between the terminal body 231 and the wall portion 213, and the connector 25 is configured to be able to perform fuse protection on the electrode assembly 22. The battery cell 20 installs the terminal body 231 on the wall portion 213 through the connector 233, and the installation is simple and convenient. The insulator 232 connects the terminal body 231 and the connector 233. In the absence of the connector 25 connecting the terminal body 231 and the connector 233, the insulator 232 can insulate and isolate the terminal body 231 and the connector 233, so that the first pole ear 221 is insulated from the wall 213. The battery cell 20 is provided with a connector 25 to connect the terminal body 231 and the connector 233, so that the terminal body 231 and the wall 213 are electrically connected, so that the shell 21 can output the electric energy of the electrode assembly 22, and the battery management system can be connected to the shell 21 of the battery cell 20, so as to realize the monitoring of the battery cell 20, which greatly reduces the wiring difficulty. In addition, the connector 25 has a fuse protection function. When the battery cell 20 is short-circuited, the connector 25 can be automatically fused, 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.

[0272] In some embodiments, the terminal body 231 includes a body portion 2312 and a stopper portion 2313, and the stopper portion 2313 protrudes from the outer peripheral surface of the body portion 2312. The connector 233 includes a first flange 2331, and along the thickness direction of the wall portion 213, the stopper portion 2313 is at least partially located between the first flange 2331 and the wall portion 213. The connector 25 is located between the stopper portion 2313 and the first flange 2331 and connects the stopper portion 2313 and the first flange 2331. The insulator 232 covers the first flange 2331, and the insulator 232 is provided with a receiving cavity 2321 for accommodating the connector 25. By arranging the connector 25 between the stopper portion 2313 and the first flange 2331, it is helpful to reduce the risk of interference between the connector 25 and other components, so that the connector 25 can stably connect the stopper portion 2313 and the first flange 2331, which is helpful to improve the life of the battery cell 20. By making the insulator 232 cover the first flange 2331, not only can the first flange 2331 be protected, but also the first flange 2331 and the terminal body 231 can be better connected. The insulator 232 is provided with a receiving cavity 2321, and the connector 25 is received in the receiving cavity 2321 and connects the first flange 2331 and the limiting portion 2313 to electrically connect the connector 233 and the terminal body 231. By providing the receiving cavity 2321 on the insulator 232, on the one hand, it is convenient to avoid the connector 25, so that the connector 25 is allowed to connect the limiting portion 2313 and the first flange 2331. On the other hand, accommodating the connector 25 in the receiving cavity 2321 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 limiting portion 2313 and the first flange 2331, which is conducive to improving the life of the battery cell 20.

[0273] Optionally, the connector 25 is an elastic element, and along the thickness direction of the wall portion 213, two ends of the connector 25 are respectively in contact with the limit portion 2313 and the first flange 2331. Since the connector 25 is an elastic element, it can apply elastic force to the limit portion 2313 and the first flange 2331, so that the connector 25 can stably contact the limit portion 2313 and the first flange 2331, so that the connector 25 is stably connected between the limit portion 2313 and the first flange 2331, which is conducive to improving the life of the battery cell 20.

[0274] In other embodiments, the connector 233 includes a second flange 2333 that is not covered by the insulator 232, the second flange 2333 is connected to the wall portion 213, and the connector 25 connects the terminal body 231 and the second flange 2333. The second flange 2333 is not covered by the insulator 232, the second flange 2333 is connected to the wall portion 213, and the connector 25 directly connects the terminal body 231 and the second flange 2333 to electrically connect the first electrode terminal 23 and the wall portion 213, without providing a receiving cavity 2321 inside the insulator 232, so that the insulator 232 can better connect the terminal body 231 and the connector 233.

[0275] The outer surface of the insulator 232 is provided with a receiving groove 2322, and the connector 25 is at least partially received in the receiving groove 2322. By providing the receiving groove 2322 on the outer surface of the insulator 232, the connector 25 is at least partially received in the receiving groove 2322, and the height of the connector 25 protruding from the outer surface of the insulator 232 is reduced, so as to reduce the risk of interference between the connector 25 and other components, which is conducive to improving the life of the battery cell 20.

[0276] Optionally, the insulator 232 is injection molded between the terminal body 231 and the connector 233. By injection molding the insulator 232 between the terminal body 231 and the connector 233, the integrity of the first electrode terminal 23 is improved, and the connection strength between the terminal body 231 and the connector 233 is higher.

[0277] The connector 25 includes a first connector 251, a fuse 252, and a second connector 253. The fuse 252 connects the first connector 251 and the second connector 253. The first connector 251 and the second connector 253 are connected to the terminal body 231 and the connector 233, respectively. 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. The first connector 251 is connected to the terminal body 231, the second connector 253 is connected to the connector 233, the fuse 252 connects the first connector 251 and the second connector 253, and the minimum flow area of ​​the fuse 252 is smaller than the minimum flow area of ​​the first connector 251, and smaller than the minimum flow area of ​​the second connector 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.

[0278] The minimum flow area of ​​the fuse 252 is S, which satisfies: 2mm 2 ≤S≤20mm 2 When S≥2mm 2When 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.

[0279] The length of the fuse 252 is L, which satisfies: 0.3mm≤L≤5mm. When L≥0.3mm, the fuse 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 252 is blown in time. When L≤5mm, the length of the fuse 252 is not too long, and the resistance of the fuse 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.

[0280] 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, wherein the electrode assembly has a first electrode tab; A first electrode terminal, comprising a terminal body, an insulator and a connector, wherein the terminal body is electrically connected to the first electrode tab, the connector is connected to the wall portion, the terminal body is at least partially located between the wall portion and the connector, and the insulator is at least partially located between the terminal body and the connector; A connector connects the connector and the terminal body to achieve electrical connection between the terminal body and the wall portion, and the connector is configured to provide fuse protection for the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The terminal body includes a main body portion and a limiting portion, the limiting portion protrudes from the outer peripheral surface of the main body portion, the connecting body includes a first flange, and along the thickness direction of the wall portion, the limiting portion is at least partially located between the first flange and the wall portion, and the connecting member is located between the limiting portion and the first flange and connects the limiting portion and the first flange.

3. The battery cell according to claim 2, characterized in that: The insulator covers the first flange, and the insulator is provided with an accommodating cavity for accommodating the connecting member.

4. The battery cell according to claim 2, characterized in that: The connecting body further comprises a main body and a second flange, wherein the first flange protrudes from a side of the main body close to the main body, the second flange protrudes from a side of the main body away from the main body, and the second flange is connected to the wall.

5. The battery cell according to claim 2, 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 are respectively in contact with the limiting portion and the first flange.

6. The battery cell according to claim 5, characterized in that: The elastic element includes a spring.

7. The battery cell according to claim 6, characterized in that: 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 limiting part and the first flange, 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.

8. The battery cell according to claim 1, characterized in that: The connecting body includes a second flange that is not covered by the insulator, the second flange is connected to the wall portion, and the connecting member connects the terminal body and the second flange.

9. The battery cell according to claim 8, characterized in that: An accommodating groove is arranged on the outer surface of the insulator, and the connecting member is at least partially accommodated in the accommodating groove.

10. The battery cell according to claim 9, characterized in that: One end of the accommodating groove extends to the terminal body, and the other end of the accommodating groove extends to the second flange.

11. The battery cell according to claim 9, characterized in that: Along a direction perpendicular to the outer surface of the insulator, the portion of the connector accommodated in the accommodating groove has a first surface closest to the outer surface of the insulator, and the minimum distance between the first surface and the outer surface of the insulator is A, satisfying: A≥0.2mm.

12. The battery cell according to claim 11, characterized in that: 0.5mm≤A≤1mm.

13. The battery cell according to claim 9, characterized in that: The terminal body is provided with a clamping slot, the clamping slot is communicated with one end of the accommodating slot, and a part of the connecting member is clamped in the clamping slot.

14. The battery cell according to claim 8, characterized in that: The terminal body includes a main body portion and a limiting portion, the limiting portion protrudes from the outer peripheral surface of the main body portion, the connecting body includes a first flange and a main body portion, the first flange protrudes from a side of the main body portion close to the main body portion, the second flange protrudes from a side of the main body portion away from the main body portion, and along the thickness direction of the wall portion, the limiting portion is at least partially located between the first flange and the wall portion.

15. The battery cell according to claim 14, characterized in that: The first flange, the main body and the second flange are all annular.

16. The battery cell according to claim 8, 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 terminal body and the second flange, 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.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The terminal body is provided with a slot, and part of the connecting member is locked in the slot.

18. The battery cell according to any one of claims 1 to 16, characterized in that: The insulator is injection molded between the terminal body and the connecting body.

19. The battery cell according to any one of claims 1 to 16, characterized in that: The battery cell includes a plurality of the connectors, and the plurality of the connectors are arranged at intervals along the circumferential direction of the terminal body.

20. The battery cell according to any one of claims 1 to 16, characterized in that: The terminal body is entirely located on a side of the wall portion away from the electrode assembly.

21. The battery cell according to any one of claims 1 to 16, 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 terminal body and the connecting body, 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.

22. The battery cell according to claim 21, characterized in that: The battery cell includes an insulating member, and the insulating member is coated on the fuse part.

23. The battery cell according to claim 21, characterized in that: The minimum flow area of ​​the fuse is S, which satisfies: 2mm 2 ≤S≤20mm 2 .

24. The battery cell according to claim 21, characterized in that: The length of the fuse portion is L, which satisfies: 0.3 mm ≤ L ≤ 5 mm.

25. The battery cell according to any one of claims 1 to 16, 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 tab, and the second electrode terminal is electrically connected to the second electrode tab.

26. The battery cell according to any one of claims 1 to 16, characterized in that: The first electrode terminal is a positive electrode terminal.

27. A battery, characterized in that: Comprising the battery cell according to any one of claims 1-26.

28. An electrical equipment, characterized in that: Comprising the battery cell according to any one of claims 1-26.

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