Battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery and electric equipment. The battery monomer comprises a shell, an electrode assembly, an electrode terminal, a first insulating part and a first sealing part, the housing has a first wall. The electrode assembly is housed within the housing. The electrode terminal is electrically connected with the electrode assembly and comprises a main body part and a first limiting part, the main body part penetrates through the first wall in the thickness direction of the first wall, and the first limiting part is connected to the main body part and located on the side, away from the electrode assembly, of the first wall. The first insulating part is at least partially located between the first limiting part and the first wall, the first insulating part is provided with a first lead-out hole, and the main body part penetrates through the first lead-out hole. The first sealing member is arranged around the first lead-out hole, and the first sealing member is configured to seal the first insulating member and the first limiting part. The first sealing piece can seal the first insulating piece and the first limiting part, so that the sealing performance between the first insulating piece and the first limiting part is improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As the demand for batteries increases, higher requirements are placed on the service life of battery cells. Therefore, how to extend the service life of battery cells is an urgent problem to be solved in battery technology. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery and an electrical device to extend the service life of the battery cell.

[0004] In the first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, an electrode terminal, a first insulating member and a first sealing member; the shell has a first wall; the electrode assembly is accommodated in the shell; the electrode terminal is electrically connected to the electrode assembly, the electrode terminal comprises a main body and a first limiting portion, along the thickness direction of the first wall, the main body passes through the first wall, the first limiting portion is connected to the main body and is located on the side of the first wall away from the electrode assembly; the first insulating member is at least partially located between the first limiting portion and the first wall, the first insulating member is provided with a first lead-out hole, the main body is passed through the first lead-out hole; the first sealing member is arranged around the first lead-out hole, and the first sealing member is configured to seal the first insulating member and the first limiting portion.

[0005] In the above technical solution, at least part of the first insulating member is located between the first limiting portion and the first wall, and the first insulating member can insulate and isolate the first limiting portion and the first wall. The main body passes through the first wall and is arranged in the first lead-out hole to facilitate the electrical connection between the electrode terminal and the electrode assembly. Since the main body passes through the first wall and is arranged in the first lead-out hole, the electrolyte in the battery cell can penetrate from the position where the main body passes through the first wall and the second lead-out hole to between the first insulating member and the first limiting portion. By arranging the first sealing member around the first lead-out hole, the first sealing member can seal the first insulating member and the first limiting portion, thereby improving the sealing performance between the first insulating member and the first limiting portion, reducing the risk of leakage of the electrolyte in the battery cell from between the first insulating member and the first limiting portion, thereby reducing the loss rate of the electrolyte in the battery cell and extending the service life of the battery cell.

[0006] In some embodiments, along the thickness direction of the first wall, the first insulating member has a first surface facing the first limiting portion. The first sealing member includes a first convex portion fixed to the first surface. The first convex portion is disposed around the first lead-out hole, and the first convex portion is in extrusion sealing with the first limiting portion. By fixing the first convex portion to the first surface, the first convex portion can be maintained to be disposed around the first lead-out hole, reducing the risk of sealing failure caused by the deviation of the first convex portion from the first lead-out hole. The extrusion sealing between the first convex portion and the first limiting portion can form a uniform and stable seal between the first convex portion and the first limiting portion, improving the sealing performance between the first convex portion and the first limiting portion, thereby improving the sealing performance between the first limiting portion and the first insulating member, reducing the risk of leakage of the electrolyte in the battery cell from between the first insulating member and the first limiting portion, and extending the service life of the battery cell.

[0007] In some embodiments, the first insulating member has a second surface facing the first wall. The second surface is disposed opposite to the first surface along the thickness direction of the first wall; along the thickness direction of the first wall, the distance between the first surface and the second surface is H 1 , and the height of the first convex portion protruding from the first surface is H 2 , 0.05 ≤ H 2 / H 1 ≤ 0.65. The extrusion force generated by the first limiting portion pressing the first convex portion is transmitted to the first insulating member, which can cause the first insulating member to deform. When H 2 / H 1 ≥ 0.05, a uniform and stable sealing area can be formed between the first convex portion and the first limiting portion, reducing the risk of sealing failure between the first convex portion and the first limiting portion. When H 2 / H 1 ≤ 0.65, the risk of extrusion deviation due to the excessive height of the first convex portion can be reduced, and further the risk of sealing failure between the first convex portion and the first limiting portion can be reduced. Therefore, when 0.05 ≤ H 2 / H 1 ≤ 0.65, it is possible to balance forming a stable sealing area between the first limiting portion and the first convex portion and reducing the risk of extrusion deviation due to the excessive height of the first convex portion, thereby reducing the risk of sealing failure between the first convex portion and the first limiting portion.

[0008] In some embodiments, the first convex portion has a first outer peripheral surface disposed around the first lead-out hole. The radius of the first outer peripheral surface is R 1 , the radius of the main body portion is R 2 , 0.1 mm ≤ R 1 -R 2 ≤ 5 mm. When R 1 -R 2When it is ≥ 0.1 mm, the first convex portion can have a sufficient width to contact the first limiting portion, reducing the risk of seal failure between the first convex portion and the first limiting portion due to the first convex portion being too narrow. At R 1 -R 2 ≤ 5 mm, the first outer peripheral surface of the first convex portion can be arranged close to the first lead-out hole. A smaller radius of the first outer peripheral surface can reduce the contact area between the first convex portion and the first limiting portion, reducing the required extrusion force for the first limiting portion and the first convex portion to achieve extrusion sealing, thereby reducing the risk of poor sealing performance between the first limiting portion and the first convex portion due to insufficient extrusion force. Therefore, when 0.1 mm ≤ R 1 -R 2 ≤ 5 mm, it is possible to balance the first convex portion maintaining a sufficient width to contact the first limiting portion and arranging the first outer peripheral surface of the first convex portion close to the first lead-out hole, thereby reducing the risk of seal failure between the first convex portion and the first limiting portion and reducing the risk of poor sealing performance between the first limiting portion and the first convex portion due to insufficient extrusion force.

[0009] In some embodiments, 0.4 mm ≤ R 1 -R 2 ≤ 1 mm. When R 1 -R 2 ≥ 0.4 mm, the first convex portion can have a larger width to contact the first limiting portion, further reducing the risk of seal failure between the first convex portion and the first limiting portion due to the first convex portion being too narrow. When R 1 -R 2 ≤ 1 mm, the first outer peripheral surface of the first convex portion can be arranged closer to the first lead-out hole, thereby further reducing the required extrusion force for the first limiting portion and the first convex portion to achieve extrusion sealing, and further reducing the risk of poor sealing performance between the first limiting portion and the first convex portion due to insufficient extrusion force. Therefore, when 0.4 mm ≤ R 1 -R 2 ≤ 1 mm, it is possible to further balance the first convex portion maintaining a sufficient width to contact the first limiting portion and arranging the first outer peripheral surface of the first convex portion close to the first lead-out hole, thereby reducing the risk of seal failure between the first convex portion and the first limiting portion and reducing the risk of poor sealing performance between the first limiting portion and the first convex portion due to insufficient extrusion force.

[0010] In some embodiments, the first convex portion has a first outer peripheral surface and a first inner peripheral surface arranged around the first lead-out hole. The radius of the first outer peripheral surface is R 1 , and the radius of the first inner peripheral surface is R 3 , 0.1 mm ≤ R 1 -R 3 ≤ 1.5 mm. At R1 -R 3 When ≥ 0.1 mm, the width of the first convex portion can be further increased, thereby further increasing the sealing area between the first limiting portion and the first convex portion. When R 1 -R 3 ≤ 1.5 mm, the extrusion force required for the first limiting portion and the first convex portion to achieve extrusion sealing can be further reduced, thereby further reducing the risk of poor sealing performance between the first limiting portion and the first convex portion due to insufficient extrusion force. Therefore, when 0.1 mm ≤ R 1 -R 3 ≤ 1.5 mm, the sealing area requirement between the first limiting portion and the first convex portion and the extrusion force requirement for achieving extrusion sealing can be further balanced, improving the sealing performance between the first convex portion and the first limiting portion.

[0011] In some embodiments, the first wall is provided with a second lead-out hole, and the main body portion passes through the second lead-out hole; the first insulating member has a second surface facing the first wall, the second surface is disposed opposite to the first surface along the thickness direction of the first wall, the second surface is provided with a second convex portion, and the second convex portion is disposed around the second lead-out hole; along the thickness direction of the first wall, the projection of the first convex portion and the projection of the second convex portion at least partially overlap, and the second convex portion is configured to seal the first insulating member and the first wall. By setting the projection of the first convex portion and the projection of the second convex portion to at least partially overlap along the thickness direction of the first wall, the extrusion force of the first limiting portion pressing the first convex portion can be transmitted to the second convex portion through the first insulating member, thereby realizing the extrusion sealing between the second convex portion and the first wall. The second convex portion is disposed around the second lead-out hole, thereby reducing the risk of leakage of the electrolyte in the battery cell between the first insulating member and the first wall, thereby reducing the loss rate of the electrolyte in the battery cell and extending the service life of the battery cell.

[0012] In some embodiments, along the thickness direction of the first wall, the distance between the first surface and the second surface is H 1 , the height of the first convex portion protruding from the first surface is H 2 , the height of the second convex portion protruding from the second surface is H 3 , 0.05 ≤ (H 2 +H 3 ) / H 1 ≤ 0.65. When (H 2 +H 3 ) / H 1 ≥ 0.05, a uniform and stable sealing area can be formed between the first convex portion and the first limiting portion and between the second convex portion and the first wall, and the risk of sealing failure between the first convex portion and the first limiting portion and between the second convex portion and the first wall. When H 2 / H 1When ≤ 0.65, the risk of extrusion and offset due to excessive height of the first convex part or the second convex part can be reduced, thereby reducing the risk of sealing failure between the first convex part and the first limiting part and between the second convex part and the first wall. Therefore, when 0.05 ≤ H 2 / H 1 ≤ 0.65, it is possible to balance forming a stable sealing area between the first limiting part and the first convex part and between the second convex part and the first wall and reducing the risk of extrusion and offset due to excessive height of the first convex part or the second convex part, thereby reducing the risk of sealing failure between the first convex part and the first limiting part and between the second convex part and the first wall.

[0013] In some embodiments, the first convex part is integrally formed with the first insulating part. By integrally forming the first convex part and the first insulating part, the forming difficulty of the first convex part can be reduced, and the sealing performance between the first convex part and the first insulating part can also be improved.

[0014] In some embodiments, the first wall is provided with a second lead-out hole, and the main body part passes through the second lead-out hole; the battery cell further includes a second sealing part, the second sealing part is arranged between the first insulating part and the first wall and surrounds the second lead-out hole, and the second sealing part is configured to seal the first insulating part and the first wall. By sealing the first insulating part and the first wall with the second sealing part, the sealing performance between the first insulating part and the first wall is improved, the risk of electrolyte leakage from between the first insulating part and the first wall in the battery cell is reduced, thereby reducing the loss rate of the electrolyte in the battery cell and prolonging the service life of the battery cell.

[0015] In some embodiments, the first insulating part has a first surface and a second surface, the first surface and the second surface are oppositely arranged along the thickness direction of the first wall, and the first surface faces the first limiting part; the second sealing part includes a second convex part, the second convex part is fixed to the second surface and surrounds the second lead-out hole, and the second convex part is in extrusion sealing with the first wall. By arranging the second convex part in extrusion sealing with the first wall, the extrusion force requirement for sealing between the first insulating part and the first wall can be reduced, and the sealing stability between the first insulating part and the first wall can be improved.

[0016] In some embodiments, the second convex part is integrally formed with the first insulating part. By integrally forming the second convex part and the first insulating part, the forming difficulty of the second convex part can be reduced, and the sealing performance between the second convex part and the first insulating part can also be improved.

[0017] In some embodiments, along the thickness direction of the first wall, the first limiting portion has a third surface facing the first insulating member. The first seal includes a third convex portion fixed to the third surface. The third convex portion is disposed around the first lead-out hole, and the third convex portion is in extrusion sealing with the first insulating member. By providing the third convex portion, the third convex portion can be extruded outside the first lead-out hole of the first insulating member, realizing the sealing between the first insulating member and the first limiting portion, reducing the risk of electrolyte leakage between the first insulating member and the first limiting portion in the battery cell, thereby reducing the loss rate of the electrolyte in the battery cell and prolonging the service life of the battery cell.

[0018] In some embodiments, the third convex portion presses the first insulating member and is at least partially embedded in the first insulating member. By pressing the first insulating member with the third convex portion and at least partially embedding it in the first insulating member, the sealing area between the third convex portion and the first insulating member can be increased, and the sealing stability between the third convex portion and the first insulating member can be improved.

[0019] In some embodiments, the first insulating member has a first surface and a second surface. The first surface and the second surface are oppositely disposed along the thickness direction of the first wall, and the first surface faces the first limiting portion; along the thickness direction of the first wall, the distance between the first surface and the second surface is H 1 , and the height of the third convex portion protruding from the third surface is H 4 , 0.05 ≤ H 4 / H 1 ≤ 0.65. When H 4 / H 1 ≥ 0.05, a uniform and stable sealing area can be formed between the third convex portion and the first insulating member, reducing the risk of sealing failure between the third convex portion and the first insulating member. When H 4 / H 1 ≤ 0.65, the risk of extrusion deviation due to too high a height of the third convex portion can be reduced, and further the risk of sealing failure between the third convex portion and the first insulating member can be reduced. Therefore, when 0.05 ≤ H 4 / H 1 ≤ 0.65, it is possible to balance forming a stable sealing area between the third convex portion and the first insulating member and reducing the risk of extrusion deviation due to too high a height of the third convex portion, thereby reducing the risk of sealing failure between the third convex portion and the first insulating member.

[0020] In some embodiments, the third convex portion has a second outer peripheral surface disposed around the first lead-out hole, and the radius of the second outer peripheral surface is R 4 , and the radius of the main body portion is R 2 , 0.1 mm ≤ R 4 -R 2 ≤ 5 mm. When R 4 -R 2When it is ≥ 0.1 mm, the third convex portion can have a sufficient width to contact the first insulating member, reducing the risk of seal failure between the third convex portion and the first insulating member due to the third convex portion being too narrow. At R 4 -R 2 When it is ≤ 5 mm, the second outer peripheral surface of the third convex portion can be arranged close to the first lead-out hole. A smaller second outer peripheral surface radius can reduce the contact area between the third convex portion and the first insulating member, reducing the required extrusion force for the first insulating member and the third convex portion to achieve extrusion sealing, thereby reducing the risk of poor sealing performance between the first insulating member and the third convex portion due to insufficient extrusion force. Therefore, when 0.1 mm ≤ R 4 -R 2 ≤ 5 mm, it is possible to balance the third convex portion maintaining a sufficient width to contact the first insulating member and arranging the second outer peripheral surface of the third convex portion close to the first lead-out hole, thereby reducing the risk of seal failure between the third convex portion and the first insulating member and reducing the risk of poor sealing performance between the first insulating member and the third convex portion due to insufficient extrusion force.

[0021] In some embodiments, 0.2 mm ≤ R 4 -R 2 ≤ 1 mm. When R 4 -R 2 ≥ 0.4 mm, the third convex portion can have a larger width to contact the first insulating member, further reducing the risk of seal failure between the third convex portion and the first insulating member due to the third convex portion being too narrow. When R 4 -R 2 ≤ 1 mm, the second outer peripheral surface of the third convex portion can be arranged closer to the first lead-out hole, thereby further reducing the required extrusion force for the first insulating member and the third convex portion to achieve extrusion sealing, and further reducing the risk of poor sealing performance between the first insulating member and the third convex portion due to insufficient extrusion force. Therefore, when 0.4 mm ≤ R 4 -R 2 ≤ 1 mm, it is possible to further balance the third convex portion maintaining a sufficient width to contact the first insulating member and arranging the second outer peripheral surface of the third convex portion close to the first lead-out hole, thereby reducing the risk of seal failure between the third convex portion and the first insulating member and reducing the risk of poor sealing performance between the first insulating member and the third convex portion due to insufficient extrusion force.

[0022] In some embodiments, the third convex portion is connected to the main body portion. By connecting the third convex portion to the main body portion, it is beneficial for the processing of the third convex portion, and also enables the third convex portion to be arranged closer to the first lead-out hole, which can reduce the material usage of the third convex portion and can also improve the sealing performance between the third convex portion and the first insulating member.

[0023] In some embodiments, the third convex portion is disposed around the main body portion, and an annular gap is formed between the third convex portion and the main body portion. By providing the annular gap between the third convex portion and the main body portion, the material usage of the third convex portion can be reduced, and the cost can be saved.

[0024] In some embodiments, the third convex portion has a second outer peripheral surface and a second inner peripheral surface disposed around the first lead-out hole. The second outer peripheral surface and the second inner peripheral surface are disposed opposite to each other, and the radius of the second outer peripheral surface is R 4 , and the radius of the second inner peripheral surface is R 5 , 0.1 mm ≤ R 4 - R 5 ≤ 1.5 mm. When R 4 - R 5 ≥ 0.1 mm, the width of the third convex portion can be further increased, thereby further increasing the sealing area between the first insulating member and the third convex portion. When R 4 - R 5 ≤ 1.5 mm, the extrusion force required for the first insulating member and the third convex portion to achieve extrusion sealing can be further reduced, thereby further reducing the risk of poor sealing performance between the first insulating member and the third convex portion due to insufficient extrusion force. Therefore, when 0.1 mm ≤ R 4 - R 5 ≤ 1.5 mm, the sealing area requirement between the first insulating member and the third convex portion and the extrusion force requirement for achieving extrusion sealing can be further balanced, and the sealing performance between the third convex portion and the first insulating member is improved.

[0025] In some embodiments, the third convex portion and the first limiting portion are integrally formed. By integrally forming the third convex portion and the first limiting portion, it is beneficial to the processing of the third convex portion and can also improve the sealing performance between the first limiting portion and the third convex portion.

[0026] In some embodiments, the electrode terminal further includes a second limiting portion. Along the thickness direction of the first wall, the first limiting portion and the second limiting portion are respectively connected to two ends of the main body portion. The second limiting portion is located on the side of the first wall facing the electrode assembly, and the second limiting portion and the first limiting portion are configured to cooperate to limit the main body portion from detaching from the first wall along the thickness direction of the first wall. By using the second limiting portion and the first limiting portion to cooperate to limit the main body portion from detaching from the first wall along the thickness direction of the first wall, the connection stability between the first limiting portion and the first wall can be improved, and the risk of sealing failure of the first seal can be reduced.

[0027] In some embodiments, the material of the first insulating member is one of soluble polytetrafluoroethylene, polyimide, fluoroplastics, or polypropylene.

[0028] In a second aspect, an embodiment of the present application provides a battery, including the battery cell provided in any one of the embodiments of the first aspect.

[0029] In a third aspect, an embodiment of the present application provides an electrical device, including the battery cell provided in any one of the first aspects or the battery provided in any one of the second aspects. The battery cell is used to supply electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 Structural schematic diagram of a vehicle provided in some embodiments of the present application;

[0032] Figure 2 Explosion diagram of a battery provided in some embodiments of the present application;

[0033] Figure 3 Explosion diagram of a battery cell provided in some embodiments of the present application;

[0034] Figure 4 Structural schematic diagram of a battery provided in some embodiments of the present application;

[0035] Figure 5 Structural schematic diagram of a battery cell provided in some other embodiments of the present application;

[0036] Figure 6 For Figure 5 Local enlarged view of area A in

[0037] Figure 7 For Figure 6 Local enlarged view of area B in

[0038] Figure 8 Structural schematic diagram of a first insulating member and a first convex portion provided in some embodiments of the present application;

[0039] Figure 9 For Figure 8 A - A cross-sectional view of

[0040] Figure 10 Structural schematic diagram of a battery cell provided in some other embodiments of the present application;

[0041] Figure 11 For Figure 10 Local enlarged view of area C in

[0042] Figure 12 For Figure 11Partial enlarged view of region D in

[0043] Figure 13 Schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0044] Figure 14 is Figure 13 Partial enlarged view of region E in

[0045] Figure 15 is Figure 14 Partial enlarged view of region F in

[0046] Icons: 1000 - vehicle; 100 - battery; 10 - battery cell; 1 - housing; 11 - end cap; 12 - casing; 12a - first wall; 121 - second lead-out hole; 2 - electrode assembly; 21 - tab; 3 - electrode terminal; 31 - first limiting portion; 311 - third surface; 32 - main body portion; 33 - second limiting portion; 4 - first insulating member; 4a - first lead-out hole; 41 - first surface; 411 - first planar portion; 412 - first curved portion; 42 - second surface; 421 - second planar portion; 422 - second curved portion; 5 - first sealing member; 51 - first convex portion; 511 - first outer peripheral surface; 512 - first inner peripheral surface; 52 - third convex portion; 521 - second outer peripheral surface; 522 - second inner peripheral surface; 6 - second sealing member; 61 - second convex portion; 7 - second insulating member; 8 - current collecting member; 20 - box body; 201 - first part; 202 - second part; 200 - controller; 300 - motor. Detailed implementation manners

[0047] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0049] As used herein, the term "embodiment" means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0050] The term "and / or" in the present application is merely 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 simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0051] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to the present application.

[0052] The term "a plurality of" as used in the present application refers to two or more (including two).

[0053] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so that the active material can be reused.

[0054] The battery cell includes, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium-metal batteries, sodium-metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0055] The 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 extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0056] In some embodiments, the positive electrode can be a positive electrode plate, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0057] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0058] As an example, the positive electrode current collector can 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. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0059] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery 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 phosphate can include but are not limited to lithium iron phosphate (such as LiFePO 4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides can include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn2O 4 ), 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 O 2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn0.1 O 2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc.

[0060] In some embodiments, the positive electrode can adopt a foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, or foam alloy, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material can also be provided. As an example, a lithium source material, potassium metal, or sodium metal can also be filled or / and deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0061] In some embodiments, the negative electrode can be a negative electrode plate, and the negative electrode plate can include a negative electrode current collector.

[0062] As an example, the negative electrode current collector can adopt a metal foil, foam metal, or composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0063] As an example, the negative electrode plate can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0064] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0065] As an example, the negative electrode active material can be the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone, or two or more of them can be used in combination.

[0066] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0067] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical stability and mechanical stability.

[0068] As an example, the material of the separator membrane can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane can be a single-layer film or a multi-layer composite film. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0069] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0070] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte functions to conduct ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0071] In some embodiments, the electrolyte salts can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0072] 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, sulfolane, 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.

[0073] Among them, the gel electrolyte includes a polymer as the skeletal network of the electrolyte, combined with an ionic liquid-lithium salt.

[0074] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0075] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0076] As an example, the inorganic solid electrolyte may include oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of halide solid electrolytes, nitride solid electrolytes and hydride solid electrolytes.

[0077] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0078] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0079] In some embodiments, the electrode assembly is a stacked structure.

[0080] As an example, multiple positive electrode sheets and multiple negative electrode sheets may be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0081] As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0082] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0083] As an example, a plurality of separator members may be provided, and are respectively provided between any adjacent positive electrode plates or negative electrode plates.

[0084] As an example, the separator members may be continuously provided, and are provided between any adjacent positive electrode plates or negative electrode plates by folding or winding.

[0085] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, or the like.

[0086] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0087] 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 shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum plastic film, etc.

[0088] 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 a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0089] 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.

[0090] 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.

[0091] In some embodiments, the battery may be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0092] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, a part of the box body may become at least a part of the floor of the vehicle, or a part of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0093] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0094] The development of battery technology needs to consider multiple design factors at the same time. For example, performance parameters such as energy density, reliability, discharge capacity, charge and discharge rate, etc. In addition, the service life of the battery also needs to be considered.

[0095] A battery cell generally may include a housing, an electrode assembly, and electrode terminals. The electrode assembly is accommodated within the housing, and the electrode terminals may be riveted to the wall of the housing. The electrode terminals may include a main body portion passing through the wall and a limiting portion located outside the wall. The electrode terminals are electrically connected to the motor assembly to output or input the electrical energy of the battery cell. To meet the insulation requirements between the electrode terminals and the wall, an insulating member may be provided between the limiting portion and the wall to reduce the risk of short circuit of the battery cell. However, since the main body portion of the electrode terminal passes through the wall, the electrode liquid inside the battery cell is likely to leak between the insulating member and the limiting portion, increasing the loss rate of the electrolyte and reducing the service life of the battery cell.

[0096] In view of this, in order to extend the service life of the battery cell, an embodiment of the present application provides a battery cell. By providing a sealing member between the limiting portion and the insulating member, the sealing performance between the insulating member and the electrode terminals is improved, the risk of leakage of the electrolyte inside the battery cell between the insulating member and the electrode terminals is reduced, thereby reducing the loss rate of the electrolyte inside the battery cell and extending the service life of the battery cell.

[0097] The battery cell described in the embodiment of the present application is applicable to batteries and electrical equipment using the batteries.

[0098] The electrical equipment may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a planer, etc.

[0099] For the convenience of description in the following embodiments, the electrical equipment is taken as an example of a vehicle for illustration.

[0100] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000. For example, the battery 100 may be used as the operating power source of the vehicle 1000.

[0101] The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start-up, navigation, and driving of the vehicle 1000.

[0102] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0103] Please refer to Figure 2 , Figure 2 FIG. 10 is an exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 20 and battery cells 10. The box body 20 is used to accommodate the battery cells 10.

[0104] Among them, the box body 20 is a component for accommodating the battery cells 10. The box body 20 provides an accommodation space for the battery cells 10, and the box body 20 can adopt various structures. In some embodiments, the box body 20 may include a first part 201 and a second part 202. The first part 201 and the second part 202 are covered with each other to define an accommodation space for accommodating the battery cells 10. The first part 201 and the second part 202 can be of various shapes, such as a cuboid, a cylinder, etc. The first part 201 may be a hollow structure with one side open, and the second part 202 may also be a hollow structure with one side open. The open side of the second part 202 is covered on the open side of the first part 201, then the box body 20 with an accommodation space is formed. It can also be that the first part 201 is a hollow structure with one side open, and the second part 202 is a plate-like structure. The second part 202 is covered on the open side of the first part 201, then the box body 20 with an accommodation space is formed. The first part 201 and the second part 202 can be sealed through a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0105] In the battery 100, the battery cells 10 can be one or multiple. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 10. It can be that multiple battery cells 10 are first connected in series, parallel, or in a mixed connection to form a battery 100 module, and then multiple battery 100 modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body 20. It can also be that all the battery cells 10 are directly connected in series, parallel, or in a mixed connection together, and then the whole formed by all the battery cells 10 is accommodated in the box body 20.

[0106] In some embodiments, the battery 100 may further include a busbar component. The plurality of battery cells 10 can be electrically connected through the busbar component to achieve series connection, parallel connection, or hybrid connection of the plurality of battery cells 10. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0107] Please refer to Figure 3 and Figure 4 , Figure 3 which is an exploded view of the battery cell 10 provided in some embodiments of the present application; Figure 4 which is a schematic structural diagram of the battery 100 provided in some embodiments of the present application. The battery cell 10 includes a housing 1 and an electrode assembly 2.

[0108] In some embodiments, the housing 1 may include a shell 12 and an end cap 11. The shell 12 has an opening, and the end cap 11 closes the opening of the shell 12.

[0109] The shell 12 is a component for accommodating the electrode assembly 2. The shell 12 can be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at opposite ends. The shell 12 can be in various shapes, such as cylindrical, cuboid, etc. The material of the shell 12 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0110] The end cap 11 is a component that closes the opening of the shell 12 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 11 and the shell 12 together define a receiving space for accommodating the electrode assembly 2, the electrolyte, and other components. The shape of the end cap 11 can be adapted to the shape of the housing 1. For example, when the shell 12 is a cuboid structure, the end cap 11 is a rectangular plate-like structure adapted to the housing 1. Another example is that when the shell 12 is cylindrical, the end cap 11 is a circular plate-like structure adapted to the shell 12. The material of the end cap 11 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 11 and the shell 12 can be the same or different.

[0111] In an embodiment where the shell 12 has an opening formed at one end, one end cap 11 can be correspondingly provided. In an embodiment where the shell 12 has openings formed at opposite ends, two end caps 11 can be correspondingly provided. The two end caps 11 respectively close the two openings of the shell 12, and the two end caps 11 and the shell 12 together define the receiving space.

[0112] In some embodiments, the battery cell 10 may further include an electrode terminal 3, which is disposed on the housing 1 and is used to electrically connect to the tab 21 of the electrode assembly 2 to output or input electrical energy of the battery cell 10. The electrode terminal 3 may be disposed on the shell 12 of the housing 1 or on the end cover 11 of the housing 1. The electrode terminal 3 may be directly connected to the tab 21, for example, the electrode terminal 3 is welded to the tab 21. The electrode terminal 3 may also be indirectly connected to the tab 21, for example, the electrode terminal 3 is indirectly connected to the tab 21 through a current collecting member. The current collecting member may be a metal conductor, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0113] As an example, Figure 3 and Figure 4 One end of the shell 12 is open, and there is one end cap 11 in the housing 1, which closes the opening. The battery cell 10 includes two electrode terminals 3, both of which pass through the wall of the shell 12 and are electrically connected to the electrode assembly 2.

[0114] Please refer to Figures 5 - 7 , Figure 5 A schematic diagram of the structure of a battery cell 10 provided in some other embodiments of the present application; Figure 6 for Figure 5 A partial enlarged view of the middle A area; Figure 7 for Figure 6 A partial enlarged view of the B area. The embodiment of the present application provides a battery cell 10, including a shell 1, an electrode assembly 2, an electrode terminal 3, a first insulating member 4 and a first sealing member 5. The shell 1 has a first wall 12a. The electrode assembly 2 is accommodated in the shell 1. The electrode terminal 3 is electrically connected to the electrode assembly 2, and the electrode terminal 3 includes a main body 32 and a first limiting portion 31. Along the thickness direction of the first wall 12a, the main body 32 passes through the first wall 12a, and the first limiting portion 31 is connected to the main body 32 and is located on the side of the first wall 12a away from the electrode assembly 2. The first insulating member 4 is at least partially located between the first limiting portion 31 and the first wall 12a, and the first insulating member 4 is provided with a first lead-out hole 4a, and the main body 32 is passed through the first lead-out hole 4a. The first sealing member 5 is arranged around the first lead-out hole 4a, and the first sealing member 5 is configured to seal the first insulating member 4 and the first limiting portion 31.

[0115] The first wall 12a may be the end cap 11 in the housing 1, and it is understood that the electrode terminal 3 is disposed on the end cap 11. The first wall 12a may also be a wall portion of the shell 12 in the housing 1, and it is understood that the electrode terminal 3 is disposed on the shell 12. The first wall 12a may be a circular wall portion, a polygonal wall portion, etc. The polygonal wall portion may be a triangular wall portion, a quadrilateral wall portion, a pentagonal wall portion, a hexagonal wall portion, etc.

[0116] The first wall 12a may be provided with a second lead-out hole 121 for leading out the electrode terminal 3, so as to facilitate the connection of the electrode terminal 3 with an external component, such as the connection of the electrode terminal 3 with a busbar component. The second lead-out hole 121 may penetrate the first wall 12a along the thickness direction of the first wall 12a.

[0117] The main body 32 of the electrode terminal 3 is located in the second lead-out hole 121, and part of the main body 32 may be located in the second lead-out hole 121, or the whole main body 32 may be located in the second lead-out hole 121. The main body 32 may be columnar, such as cylindrical, prism-shaped, etc. The shape of the second lead-out hole 121 may be adapted to the main body 32; for example, the second lead-out hole 121 is a rectangular hole, and the main body 32 is a rectangular parallelepiped. The shape of the second lead-out hole 121 may also be different from that of the main body 32, for example, the second lead-out hole 121 is a circular hole, and the main body 32 is a hexagonal prism.

[0118] The first limiting portion 31 may be connected to one end of the main body 32. The first limiting portion 31 is located on the side of the first wall 12a away from the electrode assembly 2, that is, the first limiting portion 31 is located on the outside of the first wall 12a. The first limiting portion 31 and the main body 32 may be separately provided and connected, for example, the first limiting portion 31 and the main body 32 are welded and connected; or the first limiting portion 31 and the main body 32 may be integrally formed. The first limiting portion 31 may be in the shape of a plate, for example, the first limiting portion 31 is in the shape of a rectangular plate, a disc plate, etc.

[0119] The first insulating member 4 is used to insulate and isolate the first limiting portion 31 and the first wall 12a. The first insulating member 4 may be entirely located between the electrode terminal 3 and the first wall 12a; or only a portion of the insulating member may be located between the electrode terminal 3 and the first wall 12a. The first insulating member 4 is made of an insulating material, such as soluble polytetrafluoroethylene, polyimide, fluoroplastic, polypropylene, etc. In an embodiment in which the first wall 12a is provided with a second lead-out hole 121, a portion of the first insulating member 4 may be inserted into the second lead-out hole 121, so that a portion of the first insulating member 4 may be placed between the main body 32 and the first wall 12a to insulate and isolate the first wall 12a and the main body 32.

[0120] As an example, the electrode terminal 3 may further include a second limiting portion 33. Along the thickness direction of the first wall 12a, one end of the main body 32 is connected to the first limiting portion 31, and the other end of the main body 32 is connected to the second limiting portion 33. The first limiting portion 31 and the second limiting portion 33 are respectively located on both sides of the first wall 12a. The first limiting portion 31 and the second limiting portion 33 are used to cooperate and clamp the first wall 12a to fix the electrode terminal 3 to the first wall 12a. An intermediate piece may be provided between the first limiting portion 31 and the first wall 12a and between the second limiting portion 33 and the first wall 12a to achieve the first limiting portion 31 and the second limiting portion 33 cooperating to clamp the first wall 12a.

[0121] The first seal 5 may be integrally disposed between the first insulating member 4 and the first limiting portion 31 to seal the first insulating member 4 and the first limiting portion 31. For example, the first seal 5 is an annular structure surrounding the first lead-out hole 4a. Alternatively, a part of the first seal 5 is disposed between the first insulating member 4 and the first limiting portion 31, and another part is disposed between the first insulating member 4 and the first wall 12a. The first seal 5 can seal the first insulating member 4 and the first limiting portion 31, and seal the first insulating member 4 and the first wall 12a. For example, the first seal 5 includes two annular structures surrounding the first lead-out hole 4a, one annular structure is disposed between the first insulating member 4 and the first limiting portion 31, and the other annular structure is disposed between the first insulating member 4 and the first wall 12a.

[0122] The first seal 5 may be a component independent of the first insulating member 4 and the first limiting portion 31; the first seal 5 may also be a component fixedly connected to the first insulating member 4 or the first limiting portion 31.

[0123] In the embodiment of the present application, at least a part of the first insulating member 4 is located between the first limiting portion 31 and the first wall 12a, and the first insulating member 4 can insulate and isolate the first limiting portion 31 and the first wall 12a. The main body portion 32 passes through the first wall 12a and is disposed in the first lead-out hole 4a to facilitate the electrical connection between the electrode terminal 3 and the electrode assembly 2. Since the main body portion 32 passes through the first wall 12a and is disposed in the first lead-out hole 4a, the electrolyte in the battery cell 10 can penetrate from the position where the main body portion 32 passes through the first wall 12a and the second lead-out hole 121 into the space between the first insulating member 4 and the first limiting portion 31. By disposing the first seal 5 surrounding the first lead-out hole 4a, the first seal 5 can seal the first insulating member 4 and the first limiting portion 31, improve the sealing performance between the first insulating member 4 and the first limiting portion 31, reduce the risk of leakage of the electrolyte in the battery cell 10 from between the first insulating member 4 and the first limiting portion 31, thereby reducing the loss rate of the electrolyte in the battery cell 10 and extending the service life of the battery cell 10.

[0124] In some embodiments, along the thickness direction of the first wall 12a, the first insulating member 4 has a first surface 41 facing the first limiting portion 31. The first seal 5 includes a first convex portion 51 fixed to the first surface 41. The first convex portion 51 surrounds the first lead-out hole 4a, and the first convex portion 51 is in extrusion sealing with the first limiting portion 31.

[0125] Before the first seal 5 seals the first insulating member 4 and the first limiting portion 31, the first surface 41 may be a flat surface, and the first convex portion 51 protrudes from the plane where the first surface 41 is located. When the first seal 5 seals the first insulating member 4 and the first limiting portion 31, the first surface 41 may include a first flat portion 411 and a first curved portion 412. The first convex portion 51 has a first end disposed on the first curved portion 412 and a second end abutted against the first limiting portion 31. The second end may be flush with the first flat portion 411, or the distance between the second end and the first end in a direction perpendicular to the first flat portion 411 may be greater than the distance between the second end and the first flat portion 411.

[0126] The first convex portion 51 and the first insulating member 4 may be integrally formed. For example, the first convex portion 51 and the first insulating member 4 are injection molded. Alternatively, the first convex portion 51 and the first insulating member 4 may be separately provided and connected. For example, the first convex portion 51 and the first insulating member 4 are bonded.

[0127] The first convex portion 51 surrounds the first lead-out hole 4a. The first convex portion 51 may be an annular structure, a polygonal annular structure, etc. For example, the first convex portion 51 is a hexagonal annular structure.

[0128] It may be that the first limiting portion 31 presses the first convex portion 51 so that the first convex portion 51 deforms. Compared with the first limiting portion 31 directly pressing the first insulating member 4, there is a greater pressure between the first convex portion 51 and the first limiting portion 31, making the seal between the first convex portion 51 and the first limiting portion 31 tighter, so as to achieve the extrusion seal between the first convex portion 51 and the first limiting portion 31. Alternatively, the first limiting portion 31 presses the first convex portion 51, the first convex portion 51 deforms, and the first convex portion 51 presses the first insulating member 4 so that the first insulating member 4 deforms, so as to increase the contact area between the first limiting portion 31 and the first convex portion 51 and reduce the gap between the first limiting portion 31 and the first insulating member 4, realizing the extrusion seal between the first convex portion 51 and the first limiting portion 31; wherein, the first limiting portion 31 may contact the first insulating member 4 or may not contact the first insulating member 4.

[0129] By fixing the first convex portion 51 to the first surface 41, the first convex portion 51 can be kept surrounding the first lead-out hole 4a, reducing the risk of seal failure caused by the first convex portion 51 deviating from the first lead-out hole 4a. The extrusion seal between the first convex portion 51 and the first limiting portion 31 can form a uniform and stable seal between the first convex portion 51 and the first limiting portion 31, improving the sealing performance between the first convex portion 51 and the first limiting portion 31, thereby improving the sealing performance between the first limiting portion 31 and the first insulating member 4, reducing the risk of the electrolyte in the battery cell 10 leaking from between the first insulating member 4 and the first limiting portion 31, and extending the service life of the battery cell 10.

[0130] In some embodiments, with continued reference to Figure 6 and Figure 7 . The first insulating member 4 has a second surface 42 facing the first wall 12a, and the second surface 42 is disposed opposite to the first surface 41 in the thickness direction of the first wall 12a; in the thickness direction of the first wall 12a, the distance between the first surface 41 and the second surface 42 is H 1 , and the height by which the first convex portion 51 protrudes from the first surface 41 is H 2 , 0.05 ≤ H 2 / H 1 ≤ 0.65.

[0131] It may be that only the first surface 41 is fixed with the first convex portion 51. It may also be that the first surface 41 is fixed with the first convex portion 51 and the second surface 42 is fixed with the second convex portion 61. In the embodiment where the first surface 41 is fixed with the first convex portion 51 and the second surface 42 is fixed with the second convex portion 61, the first convex portion 51 and the second convex portion 61 may be arranged in a staggered manner in the thickness direction of the first wall 12a, or the first convex portion 51 and the second convex portion 61 may at least partially overlap in the thickness direction of the first wall 12a.

[0132] The distance between the first surface 41 and the second surface 42 is the maximum distance between the first surface 41 and the second surface 42. For example, the first surface 41 includes a first planar portion 411 and a first curved surface portion 412, the second surface 42 is a plane, and the distance between the first planar portion 411 and the plane of the second surface 42 is the distance between the first surface 41 and the second surface 42.

[0133] H 2 / H 1 can take any point value between or including any two of 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65. Among them, H 2 can satisfy 0.2 mm ≤ H 2 ≤ 2 mm, and H 2 can take any point value between or including any two of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0134] In the above embodiments, the extrusion force generated by the first limiting portion 31 pressing the first convex portion 51 is transmitted to the first insulating member 4, which can cause the first insulating member 4 to deform. When H 2 / H 1When ≥ 0.05, a uniform and stable sealing area can be formed between the first convex portion 51 and the first limiting portion 31, reducing the risk of sealing failure between the first convex portion 51 and the first limiting portion 31. At H 2 / H 1 ≤ 0.65, the risk of extrusion and offset due to the excessive height of the first convex portion 51 can be reduced, and further the risk of sealing failure between the first convex portion 51 and the first limiting portion 31 can be reduced. Therefore, when 0.05 ≤ H 2 / H 1 ≤ 0.65, it is possible to balance forming a stable sealing area between the first limiting portion 31 and the first convex portion 51 and reducing the risk of extrusion and offset due to the excessive height of the first convex portion 51, thereby reducing the risk of sealing failure between the first convex portion 51 and the first limiting portion 31.

[0135] In some embodiments, please continue to refer to Figure 6 and Figure 7 . The first convex portion 51 has a first outer peripheral surface 511 surrounding the first lead-out hole 4a, and the radius of the first outer peripheral surface 511 is R 1 , and the radius of the main body portion 32 is R 2 , 0.1 mm ≤ R 1 -R 2 ≤ 5 mm.

[0136] It can be understood that the first convex portion 51 in this embodiment has an annular structure and the main body portion 32 has a cylindrical shape. The radius of the first outer peripheral surface 511 refers to the radius of the outer ring edge of the first convex portion 51.

[0137] R 1 -R 2 can take any point value between or including any two of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm.

[0138] When R 1 -R 2 ≥ 0.1 mm, the first convex portion 51 can have sufficient width to contact the first limiting portion 31, reducing the risk of sealing failure between the first convex portion 51 and the first limiting portion 31 due to the first convex portion 51 being too narrow. When R 1 -R 2When it is ≤ 5 mm, the first outer peripheral surface 511 of the first convex portion 51 can be arranged close to the first lead-out hole 4a. The smaller radius of the first outer peripheral surface 511 can reduce the contact area between the first convex portion 51 and the first limiting portion 31, and reduce the required extrusion force for the first limiting portion 31 and the first convex portion 51 to achieve extrusion sealing, thereby reducing the risk of poor sealing performance due to insufficient extrusion force between the first limiting portion 31 and the first convex portion 51. Therefore, when 0.1 mm ≤ R 1 -R 2 ≤ 5 mm, it is possible to take into account that the first convex portion 51 maintains a sufficient width to contact the first limiting portion 31 and the first outer peripheral surface 511 of the first convex portion 51 is arranged close to the first lead-out hole 4a, thereby reducing the risk of sealing failure between the first convex portion 51 and the first limiting portion 31 and reducing the risk of poor sealing performance due to insufficient extrusion force between the first limiting portion 31 and the first convex portion 51.

[0139] In some embodiments, 0.4 mm ≤ R 1 -R 2 ≤ 1 mm.

[0140] R 1 -R 2 can take any point value between or including any two of 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm. As an example, R 1 -R 2 is 0.4 mm.

[0141] When R 1 -R 2 ≥ 0.4 mm, the first convex portion 51 can have a larger width to contact the first limiting portion 31, further reducing the risk of sealing failure between the first convex portion 51 and the first limiting portion 31 due to the first convex portion 51 being too narrow. When R 1 -R 2 ≤ 1 mm, the first outer peripheral surface 511 of the first convex portion 51 can be arranged closer to the first lead-out hole 4a, thereby further reducing the required extrusion force for the first limiting portion 31 and the first convex portion 51 to achieve extrusion sealing, and further reducing the risk of poor sealing performance due to insufficient extrusion force between the first limiting portion 31 and the first convex portion 51. Therefore, when 0.4 mm ≤ R 1 -R 2When it is ≤ 1 mm, it is possible to further balance maintaining a sufficient width of the first convex portion 51 to contact the first limiting portion 31 and making the first outer peripheral surface 511 of the first convex portion 51 close to the first lead-out hole 4a, thereby reducing the risk of seal failure between the first convex portion 51 and the first limiting portion 31 and reducing the risk of poor sealing performance between the first limiting portion 31 and the first convex portion 51 due to insufficient extrusion pressure.

[0142] In some embodiments, please continue to refer to Figure 6 and Figure 7 . The first convex portion 51 has a first outer peripheral surface 511 and a first inner peripheral surface 512 that are arranged around the first lead-out hole 4a. The radius of the first outer peripheral surface 511 is R 1 , and the radius of the first inner peripheral surface 512 is R 3 , 0.1 mm ≤ R 1 -R 3 ≤ 1.5 mm.

[0143] The radius of the first inner peripheral surface 512 refers to the radius of the inner ring edge of the first convex portion 51. R 1 -R 3 can take any point value between or including any two of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm.

[0144] When R 1 -R 3 ≥ 0.1 mm, the width of the first convex portion 51 can be further increased, thereby further increasing the sealing area between the first limiting portion 31 and the first convex portion 51. When R 1 -R 3 ≤ 1.5 mm, the extrusion pressure required for the first limiting portion 31 and the first convex portion 51 to achieve extrusion sealing can be further reduced, thereby further reducing the risk of poor sealing performance between the first limiting portion 31 and the first convex portion 51 due to insufficient extrusion pressure. Therefore, when 0.1 mm ≤ R 1 -R 3 ≤ 1.5 mm, it is possible to further balance the sealing area requirement between the first limiting portion 31 and the first convex portion 51 and the extrusion pressure requirement for achieving extrusion sealing, improving the sealing performance between the first convex portion 51 and the first limiting portion 31.

[0145] In some embodiments, please refer to Figure 8 and Figure 9 , Figure 8 is a schematic structural diagram of the first insulating member 4 and the first convex portion 51 provided in some embodiments of the present application; Figure 9 isFigure 8 Cross-sectional view A-A. Before the first limiting portion 31 and the first convex portion 51 are sealed, both the first surface 41 and the second surface 42 are flat, and the distance between the first surface 41 and the second surface 42 is H 1 , and the height by which the first convex portion 51 protrudes from the first surface 41 is H 2 , 0.05 ≤ H 2 / H 1 ≤ 0.65.

[0146] H 2 / H 1 can take the point value between any two or one of 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65. Among them, H 2 can satisfy 0.2 mm ≤ H 2 ≤ 2 mm, H 2 can take the point value between any two or one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0147] In some embodiments, please refer to Figures 10 - 12 , Figure 10 is a schematic structural view of the battery cell 10 provided in still other embodiments of the present application; Figure 11 is Figure 10 a partial enlarged view of the C region in Figure 12 is Figure 11 a partial enlarged view of the D region in . The first wall 12a is provided with a second lead-out hole 121, and the main body portion 32 passes through the second lead-out hole 121; the first insulating member 4 has a second surface 42 facing the first wall 12a, the second surface 42 and the first surface 41 are oppositely arranged along the thickness direction of the first wall 12a, the second surface 42 is provided with a second convex portion 61, and the second convex portion 61 is arranged around the second lead-out hole 121; along the thickness direction of the first wall 12a, the projection of the first convex portion 51 and the projection of the second convex portion 61 at least partially overlap, and the second convex portion 61 is configured to seal the first insulating member 4 and the first wall 12a.

[0148] The first lead-out hole 4a can be a round hole, a polygonal hole, etc. For example, the first lead-out hole 4a is a hexagonal hole.

[0149] It may be that along the thickness direction of the first wall 12a, the projections of the first convex portion 51 and the second convex portion 61 completely overlap; or it may be that along the thickness direction of the first wall 12a, the projections of the first convex portion 51 and the second convex portion 61 only partially overlap.

[0150] Before the second convex portion 61 seals the first insulating member 4 and the first wall 12a, the second surface 42 may be a plane, and the second convex portion 61 protrudes from the plane where the second surface 42 is located. When the second convex portion 61 seals the first insulating member 4 and the first wall 12a, the second surface 42 may include a second planar portion 421 and a second curved surface portion 422. The second convex portion 61 has a third end disposed on the second curved surface portion 422 and a fourth end abutted against the first wall 12a. It may be that the fourth end is flush with the second planar portion 421, or it may be that along the direction perpendicular to the second planar portion 421, the distance between the fourth end and the third end is greater than the distance between the fourth end and the second planar portion 421.

[0151] By setting the projections of the first convex portion 51 and the second convex portion 61 to at least partially overlap along the thickness direction of the first wall 12a, the extrusion force of the first limiting portion 31 pressing the first convex portion 51 can be transmitted to the second convex portion 61 through the first insulating member 4, so as to realize the extrusion seal between the second convex portion 61 and the first wall 12a. The second convex portion 61 is disposed around the second lead-out hole 121, thereby reducing the risk of electrolyte leakage from between the first insulating member 4 and the first wall 12a in the battery cell 10, thereby reducing the loss rate of the electrolyte in the battery cell 10 and prolonging the service life of the battery cell 10.

[0152] In some embodiments, please continue to refer to Figure 11 and Figure 12 . Along the thickness direction of the first wall 12a, the distance between the first surface 41 and the second surface 42 is H 1 , the height of the first convex portion 51 protruding from the first surface 41 is H 2 , the height of the second convex portion 61 protruding from the second surface 42 is H 3 , 0.05 ≤ (H 2 +H 3 ) / H 1 ≤ 0.65.

[0153] (H 2 +H 3 ) / H 1 can take any point value between or including any two of 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65. Among them, H 2 +H 3 can satisfy 0.4 mm ≤ H 2+H 3 ≤2mm, H 2 +H 3 can take the point values between any two or one of 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm. As an example, H 2 and H 3 are both 0.2mm.

[0154] When (H 2 +H 3 ) / H 1 ≥0.05, a uniform and stable sealing area can be formed between the first convex portion 51 and the first limiting portion 31, and between the second convex portion 61 and the first wall 12a, and the risk of sealing failure between the first convex portion 51 and the first limiting portion 31, and between the second convex portion 61 and the first wall 12a. When H 2 / H 1 ≤0.65, the risk of extrusion and offset due to excessive height of the first convex portion 51 or the second convex portion 61 can be reduced, and further the risk of sealing failure between the first convex portion 51 and the first limiting portion 31, and between the second convex portion 61 and the first wall 12a. Therefore, when 0.05 ≤ H 2 / H 1 ≤0.65, it is possible to balance forming a stable sealing area between the first limiting portion 31 and the first convex portion 51, and between the second convex portion 61 and the first wall 12a, and reducing the risk of extrusion and offset due to excessive height of the first convex portion 51 or the second convex portion 61, thereby reducing the risk of sealing failure between the first convex portion 51 and the first limiting portion 31, and between the second convex portion 61 and the first wall 12a.

[0155] In some embodiments, the first convex portion 51 is integrally formed with the first insulating member 4.

[0156] It can be that the first convex portion 51 and the first insulating member 4 are injection molded.

[0157] By integrally forming the first convex portion 51 and the first insulating member 4, the forming difficulty of the first convex portion 51 can be reduced, and the sealing performance between the first convex portion 51 and the first insulating member 4 can also be improved.

[0158] In some embodiments, the first wall 12a is provided with a second lead-out hole 121, and the main body portion 32 passes through the second lead-out hole 121; the battery cell 10 further includes a second sealing member 6, the second sealing member 6 is disposed between the first insulating member 4 and the first wall 12a and is disposed around the second lead-out hole 121, and the second sealing member 6 is configured to seal the first insulating member 4 and the first wall 12a.

[0159] The second seal 6 may be a second convex portion 61, and the second convex portion 61 is configured to seal the first insulating member 4 and the first wall 12a. Alternatively, the second seal 6 may include the second convex portion 61 and other convex portions. Both the second convex portion 61 and the other convex portions are used to seal the first insulating member 4 and the first wall 12a, and the second convex portion 61 and the other convex portions form a multi-stage seal between the first insulating member 4 and the first wall 12a.

[0160] By sealing the first insulating member 4 and the first wall 12a with the second seal 6, the sealing performance between the first insulating member 4 and the first wall 12a is improved, the risk of electrolyte leakage from between the first insulating member 4 and the first wall 12a in the battery cell 10 is reduced, thereby reducing the loss rate of the electrolyte in the battery cell 10 and extending the service life of the battery cell 10.

[0161] In some embodiments, please continue to refer to Figure 11 and Figure 12 . The first insulating member 4 has a first surface 41 and a second surface 42. The first surface 41 and the second surface 42 are disposed opposite to each other in the thickness direction of the first wall 12a, and the first surface 41 faces the first limiting portion 31. The second seal 6 includes a second convex portion 61. The second convex portion 61 is fixed to the second surface 42 and is disposed around the second lead-out hole 121. The second convex portion 61 is in extrusion sealing with the first wall 12a.

[0162] It may be that the first wall 12a extrudes the second convex portion 61 so that the second convex portion 61 deforms to increase the contact area between the second convex portion 61 and the first wall 12a, thereby realizing the extrusion sealing between the second convex portion 61 and the first wall 12a. Alternatively, the first wall 12a extrudes the second convex portion 61, the second convex portion 61 deforms, and the second convex portion 61 extrudes the first insulating member 4 so that the first insulating member 4 deforms, to increase the contact area between the first wall 12a and the second convex portion 61 and reduce the gap between the first wall 12a and the first insulating member 4, thereby realizing the extrusion sealing between the second convex portion 61 and the first wall 12a.

[0163] By providing the extrusion sealing between the second convex portion 61 and the first wall 12a, the required extrusion force for sealing between the first insulating member 4 and the first wall 12a can be reduced, and the sealing stability between the first insulating member 4 and the first wall 12a can be improved.

[0164] In some embodiments, the second convex portion 61 is integrally formed with the first insulating member 4.

[0165] It may be that the second convex portion 61 and the first insulating member 4 are integrally injection-molded.

[0166] By integrally forming the second convex portion 61 and the first insulating member 4, the forming difficulty of the second convex portion 61 can be reduced, and the sealing performance between the second convex portion 61 and the first insulating member 4 can also be improved.

[0167] In some embodiments, please refer to Figures 13 - 15 , Figure 13 which is a schematic structural diagram of the battery cell 10 provided in some other embodiments of the present application; Figure 14 is Figure 13 a partial enlarged view of region E in Figure 15 is Figure 14 a partial enlarged view of region F in . Along the thickness direction of the first wall 12a, the first limiting portion 31 has a third surface 311 facing the first insulating member 4. The first sealing member 5 includes a third convex portion 52 fixed to the third surface 311. The third convex portion 52 is disposed around the first lead-out hole 4a, and the third convex portion 52 is in extrusion sealing with the first insulating member 4.

[0168] The third convex portion 52 and the first limiting portion 31 may be integrally formed, or the third convex portion 52 and the first limiting portion 31 may be separately provided and connected.

[0169] In the embodiment where the third convex portion 52 and the first limiting portion 31 are separately provided and connected, the third convex portion 52 may be a rigid member. The third convex portion 52 presses the first insulating member 4 to cause the first insulating member 4 to deform, so that the seal between the third convex portion 52 and the first insulating member 4 is tighter, realizing the extrusion seal between the third convex portion 52 and the first insulating member 4. The third convex portion 52 may also be a flexible member. The third convex portion 52 presses the first insulating member 4 to cause both the first insulating member 4 and the third convex portion 52 to deform, so that the seal between the third convex portion 52 and the first insulating member 4 is tighter, realizing the extrusion seal between the third convex portion 52 and the first insulating member 4; wherein, the first limiting portion 31 may contact the first insulating member 4 or may not contact the first insulating member 4.

[0170] By providing the third convex portion 52, the third convex portion 52 can be pressed outside the first lead-out hole 4a of the first insulating member 4 to realize the seal between the first insulating member 4 and the first limiting portion 31, reducing the risk of the electrolyte in the battery cell 10 leaking between the first insulating member 4 and the first limiting portion 31, thereby reducing the loss rate of the electrolyte in the battery cell 10 and extending the service life of the battery cell 10.

[0171] In some embodiments, the third convex portion 52 presses the first insulating member 4 and is at least partially embedded in the first insulating member 4.

[0172] The third convex portion 52 presses against the first insulating member 4 to form a first curved surface portion 412 on the first surface 41. The third convex portion 52 may be entirely located within the gap surrounded by the first curved surface portion 412, or only partially located within the gap surrounded by the first curved surface portion 412, so as to form a gap between the third surface 311 and the first planar portion 411.

[0173] By pressing the first insulating member 4 with the third convex portion 52 and at least partially embedding it in the first insulating member 4, the sealing area between the third convex portion 52 and the first insulating member 4 can be increased, and the sealing stability between the third convex portion 52 and the first insulating member 4 can be improved.

[0174] In some embodiments, the first insulating member 4 has a first surface 41 and a second surface 42. The first surface 41 and the second surface 42 are disposed opposite to each other along the thickness direction of the first wall 12a, and the first surface 41 faces the first limiting portion 31. Along the thickness direction of the first wall 12a, the distance between the first surface 41 and the second surface 42 is H 1 , and the height of the third convex portion 52 protruding from the third surface 311 is H 4 , 0.05 ≤ H 4 / H 1 ≤ 0.65.

[0175] H 4 / H 1 can take the point values between or including any two of 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65. Among them, H 4 can satisfy 0.2 mm ≤ H 4 ≤ 2 mm, and H 4 can take the point values between or including any two of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0176] When H 4 / H 1 ≥ 0.05, a uniform and stable sealing area can be formed between the third convex portion 52 and the first insulating member 4, reducing the risk of sealing failure between the third convex portion 52 and the first insulating member 4. When H 4 / H 1 ≤ 0.65, the risk of extrusion and offset due to the excessive height of the third convex portion 52 can be reduced, thereby reducing the risk of sealing failure between the third convex portion 52 and the first insulating member 4. Therefore, when 0.05 ≤ H4 / H 1 When ≤ 0.65, it is possible to balance forming a stable sealing area between the third convex portion 52 and the first insulating member 4 and reducing the risk of extrusion and displacement due to the excessive height of the third convex portion 52, thereby reducing the risk of sealing failure between the third convex portion 52 and the first insulating member 4.

[0177] In some embodiments, the third convex portion 52 has a second outer peripheral surface 521 surrounding the first lead hole 4a, and the radius of the second outer peripheral surface 521 is R 4 , and the radius of the main body portion 32 is R 2 , 0.1 mm ≤ R 4 -R 2 ≤ 5 mm.

[0178] It can be understood that in this embodiment, the third convex portion 52 has an annular structure and the main body portion 32 has a cylindrical shape. The radius of the second outer peripheral surface 521 refers to the radius of the outer ring edge of the third convex portion 52.

[0179] R 4 -R 2 can take any point value between or including any two of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm.

[0180] When R 4 -R 2 ≥ 0.1 mm, the third convex portion 52 can have sufficient width to contact the first insulating member 4, reducing the risk of sealing failure between the third convex portion 52 and the first insulating member 4 due to the third convex portion 52 being too narrow. When R 4 -R 2 ≤ 5 mm, the second outer peripheral surface 521 of the third convex portion 52 can be arranged close to the first lead hole 4a. The smaller radius of the second outer peripheral surface 521 can reduce the contact area between the third convex portion 52 and the first insulating member 4, reducing the required extrusion force for the first insulating member 4 and the third convex portion 52 to achieve extrusion sealing, thereby reducing the risk of poor sealing performance between the first insulating member 4 and the third convex portion 52 due to insufficient extrusion force. Therefore, when 0.1 mm ≤ R 4 -R 2When it is ≤ 5 mm, it is possible to balance maintaining a sufficient width of the third convex portion 52 in contact with the first insulating member 4 and making the second outer peripheral surface 521 of the third convex portion 52 close to the first lead-out hole 4a, thereby reducing the risk of seal failure between the third convex portion 52 and the first insulating member 4 and reducing the risk of poor sealing performance due to insufficient extrusion pressure between the first insulating member 4 and the third convex portion 52.

[0181] In some embodiments, 0.2 mm ≤ R 4 -R 2 ≤ 1 mm.

[0182] R 4 -R 2 can take the point values between any two or one of 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm. As an example, R 4 -R 2 is 0.4 mm.

[0183] When R 4 -R 2 ≥ 0.4 mm, the third convex portion 52 can have a larger width in contact with the first insulating member 4, further reducing the risk of seal failure between the third convex portion 52 and the first insulating member 4 due to the third convex portion 52 being too narrow. When R 4 -R 2 ≤ 1 mm, the second outer peripheral surface 521 of the third convex portion 52 can be made to be closer to the first lead-out hole 4a, thereby further reducing the extrusion pressure required for the first insulating member 4 and the third convex portion 52 to achieve extrusion sealing, and further reducing the risk of poor sealing performance due to insufficient extrusion pressure between the first insulating member 4 and the third convex portion 52. Therefore, when 0.4 mm ≤ R 4 -R 2 ≤ 1 mm, it is possible to further balance maintaining a sufficient width of the third convex portion 52 in contact with the first insulating member 4 and making the second outer peripheral surface 521 of the third convex portion 52 close to the first lead-out hole 4a, thereby reducing the risk of seal failure between the third convex portion 52 and the first insulating member 4 and reducing the risk of poor sealing performance due to insufficient extrusion pressure between the first insulating member 4 and the third convex portion 52.

[0184] In some embodiments, the third convex portion 52 is connected to the main body portion 32.

[0185] The third convex portion 52 is directly connected to the main body portion 32, and it can be welding, bonding, etc. between the third convex portion 52 and the main body portion 32.

[0186] Connecting the main body portion 32 through the third convex portion 52 is beneficial to the processing of the third convex portion 52, and also enables the third convex portion 52 to be arranged closer to the first lead-out hole 4a, which can reduce the material usage of the third convex portion 52 and also improve the sealing performance between the third convex portion 52 and the first insulating member 4.

[0187] In some embodiments, the third convex portion 52 is arranged to surround the main body portion 32, and an annular gap is formed between the third convex portion 52 and the main body portion 32.

[0188] By providing an annular gap between the third convex portion 52 and the main body portion 32, the material usage of the third convex portion 52 can be reduced and the cost can be saved.

[0189] In some embodiments, the third convex portion 52 has a second outer peripheral surface 521 and a second inner peripheral surface 522 arranged to surround the first lead-out hole 4a. The second outer peripheral surface 521 and the second inner peripheral surface 522 are oppositely arranged, and the radius of the second outer peripheral surface 521 is R 4 , and the radius of the second inner peripheral surface 522 is R 5 , 0.1 mm ≤ R 4 -R 5 ≤ 1.5 mm.

[0190] The radius of the second inner peripheral surface 522 refers to the radius of the inner ring edge of the third convex portion 52. R 4 -R 5 can take any point value between or including any two of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm.

[0191] When R 4 -R 5 ≥ 0.1 mm, the width of the third convex portion 52 can be further increased, thereby further increasing the sealing area between the first insulating member 4 and the third convex portion 52. When R 4 -R 5 ≤ 1.5 mm, the extrusion pressure required for the first insulating member 4 and the third convex portion 52 to achieve extrusion sealing can be further reduced, thereby further reducing the risk of poor sealing performance between the first insulating member 4 and the third convex portion 52 due to insufficient extrusion pressure. Therefore, when 0.1 mm ≤ R 4 -R 5 ≤ 1.5 mm, the sealing area requirement between the first insulating member 4 and the third convex portion 52 and the extrusion pressure requirement for achieving extrusion sealing can be further balanced, improving the sealing performance between the third convex portion 52 and the first insulating member 4.

[0192] In some embodiments, the third convex portion 52 and the first limiting portion 31 are integrally formed.

[0193] It may be that the third convex portion 52 and the first limiting portion 31 are formed by casting.

[0194] By integrally forming the third convex portion 52 and the first limiting portion 31, it is beneficial to the processing of the third convex portion 52 and can also improve the sealing performance between the first limiting portion 31 and the third convex portion 52.

[0195] In some embodiments, the electrode terminal 3 further includes a second limiting portion 33. Along the thickness direction of the first wall 12a, the first limiting portion 31 and the second limiting portion 33 are respectively connected to two ends of the main body portion 32. The second limiting portion 33 is located on the side of the first wall 12a facing the electrode assembly 2. The second limiting portion 33 and the first limiting portion 31 are configured to cooperate to limit the main body portion 32 from detaching from the first wall 12a along the thickness direction of the first wall 12a.

[0196] As an example, the electrode terminal 3 may have a T-shaped structure before being installed on the first wall 12a. The electrode terminal 3 includes two parts, namely the first limiting portion 31 and a column body. During installation, the column body passes through the second lead-out hole 121, and the column body can be flanged and riveted so that the column body correspondingly forms the main body portion 32 and the second limiting portion 33. Wherein, a second insulating member 7 may be provided between the second limiting portion 33 and the first wall 12a. The second insulating member 7 is used for insulating and isolating the second limiting portion 33 and the first wall 12a. A current collecting member 8 may also be provided between the second limiting portion 33 and the second insulating member 7. The current collecting member 8 is used for electrically connecting the electrode terminal 3 and the electrode assembly 2.

[0197] By the second limiting portion 33 and the first limiting portion 31 cooperating to limit the main body portion 32 from detaching from the first wall 12a along the thickness direction of the first wall 12a, the connection stability between the first limiting portion 31 and the first wall 12a can be improved, and the risk of sealing failure of the first sealing member 5 can be reduced.

[0198] In some embodiments, the material of the first insulating member 4 is one of soluble polytetrafluoroethylene, polyimide, fluoroplastics or polypropylene.

[0199] The embodiment of the present application provides a battery 100, including the battery cell 10 provided in any one of the above embodiments.

[0200] The embodiment of the present application provides an electrical device, including the battery cell 10 provided in any one of the above embodiments or the battery 100 provided in any one of the above embodiments. The battery cell 10 is used to provide electrical energy to the electrical device.

[0201] Please continue to refer to Figures 13 - 15. The embodiment of the present application provides a battery cell 10, including a shell 1, an electrode assembly 2, an electrode terminal 3, a first insulating member 4 and a first sealing member 5. The shell 1 includes a shell 12 and an end cover 11, the shell 12 has an opening, the end cover 11 blocks the opening, the shell 1 is in the shape of a rectangular parallelepiped, the length and width of the shell 1 are both greater than the thickness, and the length and width of the end cover 11 are the length and width of the shell 1. The electrode assembly 2 is accommodated in the shell 1. The shell 1 has a first wall 12a, the first wall 12a is located on the shell 12, and the electrode terminal 3 is arranged on the first wall 12a. The electrode terminal 3 includes a first limiting portion 31, a main body 32 and a second limiting portion 33. The main body 32 connects the first limiting portion 31 and the second limiting portion 33. The first limiting portion 31 is located on the side of the first wall 12a away from the inside of the housing 1. The first wall 12a has a second lead-out hole 121 for the main body 32 to pass through. The first limiting portion 31 and the second limiting portion 33 are configured to cooperate to limit the main body 32 from detaching from the first wall 12a along the thickness direction of the first wall 12a. The first insulating member 4 is at least partially located between the first limiting portion 31 and the first wall 12a. The first insulating member 4 has a first lead-out hole 4a for the main body 32 to pass through. The first sealing member 5 includes a first convex portion 51. The first convex portion 51 is located between the first limiting portion 31 and the first insulating member 4. The first convex portion 51 is arranged around the first lead-out hole 4a. The first convex portion 51 is configured to seal the first insulating member 4 and the first limiting portion 31.

[0202] By arranging at least part of the first insulating member 4 between the first limiting portion 31 and the first wall 12a, the first insulating member 4 can insulate and isolate the first limiting portion 31 and the first wall 12a. The main body 32 passes through the first wall 12a and the first lead-out hole 4a of the first insulating member 4, so as to realize the electrical connection between the electrode terminal 3 and the electrode assembly 2. The electrolyte in the battery cell 10 can penetrate from the main body 32 through the position of the first wall 12a and the second lead-out hole 121 to between the first insulating member 4 and the first limiting portion 31. The first sealing member 5 is arranged around the first lead-out hole 4a. The first sealing member 5 can seal the first insulating member 4 and the first limiting portion 31, improve the sealing performance between the first insulating member 4 and the first limiting portion 31, reduce the risk of the electrolyte in the battery cell 10 leaking from the first insulating member 4 and the first limiting portion 31, thereby reducing the loss rate of the electrolyte in the battery cell 10 and extending the service life of the battery cell 10.

[0203] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0204] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and variations can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall; an electrode assembly, contained in the housing; an electrode terminal, electrically connected to the electrode assembly, the electrode terminal comprising a main body and a first stopper, the main body passing through the first wall along the thickness direction of the first wall, the first stopper being connected to the main body and located on a side of the first wall away from the electrode assembly; A first insulating member, at least partially located between the first limiting portion and the first wall, the first insulating member is provided with a first lead-out hole, and the main body is passed through the first lead-out hole; A first sealing member is disposed around the first lead-out hole, and the first sealing member is configured to seal the first insulating member and the first limiting portion.

2. The battery cell according to claim 1, characterized in that: Along the thickness direction of the first wall, the first insulating member has a first surface facing the first limiting portion, and the first sealing member includes a first protrusion fixed to the first surface, the first protrusion is arranged around the first lead-out hole, and the first protrusion is squeezed and sealed with the first limiting portion.

3. The battery cell according to claim 2, characterized in that: The first insulating member has a second surface facing the first wall, and the second surface is arranged opposite to the first surface along the thickness direction of the first wall; Along the thickness direction of the first wall, the distance between the first surface and the second surface is H1, the height of the first protrusion protruding from the first surface is H2, and 0.05≤H2 / H1≤0.

65.

4. The battery cell according to claim 2, characterized in that: The first protrusion has a first outer peripheral surface arranged around the first lead-out hole, the radius of the first outer peripheral surface is R1, the radius of the main body is R2, and 0.1 mm≤R1-R2≤5 mm.

5. The battery cell according to claim 4, characterized in that: 0.4mm≤R1-R2≤1mm.

6. The battery cell according to claim 2, characterized in that: The first convex portion has a first outer circumferential surface and a first inner circumferential surface arranged around the first lead-out hole, the radius of the first outer circumferential surface is R1, the radius of the first inner circumferential surface is R3, and 0.1 mm≤R1-R3≤1.5 mm.

7. The battery cell according to claim 2, characterized in that: The first wall is provided with a second lead-out hole, and the main body is passed through the second lead-out hole; The first insulating member has a second surface facing the first wall, the second surface and the first surface are arranged opposite to each other along the thickness direction of the first wall, the second surface is provided with a second convex portion, and the second convex portion is arranged around the second lead-out hole; Along the thickness direction of the first wall, a projection of the first protrusion and a projection of the second protrusion at least partially overlap, and the second protrusion is configured to seal the first insulating member and the first wall.

8. The battery cell according to claim 7, characterized in that: Along the thickness direction of the first wall, the distance between the first surface and the second surface is H1, the height of the first protrusion protruding from the first surface is H2, the height of the second protrusion protruding from the second surface is H3, and 0.05≤(H2+H3) / H1≤0.

65.

9. The battery cell according to claim 2, characterized in that: The first protrusion and the first insulating member are integrally formed.

10. The battery cell according to claim 1, characterized in that: The first wall is provided with a second lead-out hole, and the main body is passed through the second lead-out hole; The battery cell further includes a second sealing member disposed between the first insulating member and the first wall and surrounding the second lead-out hole, wherein the second sealing member is configured to seal the first insulating member and the first wall.

11. The battery cell according to claim 10, characterized in that: The first insulating member has a first surface and a second surface, the first surface and the second surface are arranged opposite to each other along the thickness direction of the first wall, and the first surface is arranged facing the first limiting portion; The second sealing member includes a second convex portion, the second convex portion is fixed to the second surface and is arranged around the second outlet hole, and the second convex portion is squeezed and sealed with the first wall.

12. The battery cell according to claim 11, characterized in that: The second protrusion is integrally formed with the first insulating member.

13. The battery cell according to any one of claims 1 to 12, characterized in that: Along the thickness direction of the first wall, the first limiting portion has a third surface facing the first insulating member, and the first sealing member includes a third protrusion fixed to the third surface, the third protrusion is arranged around the first lead-out hole, and the third protrusion is squeezed and sealed with the first insulating member.

14. The battery cell according to claim 13, characterized in that: The third protrusion presses the first insulating member and is at least partially embedded in the first insulating member.

15. The battery cell according to claim 14, characterized in that: The first insulating member has a first surface and a second surface, the first surface and the second surface are arranged opposite to each other along the thickness direction of the first wall, and the first surface is arranged facing the first limiting portion; Along the thickness direction of the first wall, the distance between the first surface and the second surface is H1, the height of the third protrusion protruding from the third surface is H4, and 0.05≤H4 / H1≤0.

65.

16. The battery cell according to claim 15, characterized in that: The third protrusion has a second outer peripheral surface arranged around the first lead-out hole, the radius of the second outer peripheral surface is R4, the radius of the main body is R2, and 0.1mm≤R4-R2≤5mm.

17. The battery cell according to claim 16, characterized in that: 0.2mm≤R4-R2≤1mm.

18. The battery cell according to claim 13, characterized in that: The third protrusion is connected to the main body.

19. The battery cell according to claim 13, characterized in that: The third convex portion is arranged around the main body portion, and an annular gap is formed between the third convex portion and the main body portion.

20. The battery cell according to claim 19, characterized in that The third protrusion has a second outer circumferential surface and a second inner circumferential surface arranged around the first lead-out hole, the second outer circumferential surface and the second inner circumferential surface are arranged opposite to each other, the radius of the second outer circumferential surface is R4, the radius of the second inner circumferential surface is R5, and 0.1mm≤R4-R5≤1.5mm.

21. The battery cell according to claim 13, characterized in that: The third protrusion and the first limiting portion are integrally formed.

22. The battery cell according to any one of claims 1 to 12, characterized in that: The electrode terminal also includes a second limiting portion, and along the thickness direction of the first wall, the first limiting portion and the second limiting portion are respectively connected to the two ends of the main body, and the second limiting portion is located on the side of the first wall facing the electrode assembly, and the second limiting portion and the first limiting portion are configured to cooperate to limit the main body from detaching from the first wall along the thickness direction of the first wall.

23. The battery cell according to any one of claims 1 to 12, characterized in that: The material of the first insulating member is one of soluble polytetrafluoroethylene, polyimide, fluoroplastic or polypropylene.

24. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 23.

25. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 23 or a battery as claimed in claim 24, wherein the battery cell is used to provide electrical energy to the electrical device.

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