Battery cell, battery and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a first wall, an electrode terminal and a separator, the electrode terminal is mounted on the first wall, at least part of the separator is arranged between the first wall and the electrode terminal, at least part of the structure in the separator has yield strength Q1, and Q1 is greater than or equal to 30Mpa. According to some embodiments of the present application, the yield strength of at least part of the structure in the separator is set to be not less than 30 MPa, so that in the electrode terminal processing process, the risk of complete crushing of the separator is reduced, the yield of the separator after the completion of the preparation of the battery monomer is improved, the risk of direct contact between the electrode terminal and the first wall is reduced, and the production efficiency of the battery monomer is improved. And the safety of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, and more particularly, to a battery cell, a battery and a power consuming device. BACKGROUND

[0002] Battery cells are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc.

[0003] In the development of battery technology, how to improve the safety of battery cells is a technical problem to be solved in battery technology. SUMMARY

[0004] The present application provides a battery cell, a battery and a power consuming device, which can improve the safety of the battery cell.

[0005] In a first aspect, some embodiments of the present application provide a battery cell, comprising a first wall, an electrode terminal and a spacer, the electrode terminal is installed on the first wall, at least part of the spacer is arranged between the first wall and the electrode terminal, and at least part of the structure of the spacer has a yield strength Q1, Q1 satisfies: Q1≥30Mpa.

[0006] In the above technical solution, by setting the yield strength of at least part of the structure of the spacer to be not less than 30MPa, the risk of the spacer being completely crushed during the processing of the electrode terminal is reduced, the yield of the spacer after the preparation of the battery cell is improved, the risk of direct contact between the electrode terminal and the first wall is reduced, and the safety of the battery cell is improved.

[0007] In some embodiments, the spacer has a reinforcing part, and at least part of the reinforcing part is clamped between the electrode terminal and the first wall.

[0008] In the above technical solution, the reinforcing part is clamped between the electrode terminal and the first wall, so that during the processing of the electrode terminal, the risk of the structure of the spacer located between the electrode terminal and the first wall being completely crushed due to the extrusion of the electrode terminal and the first wall is reduced. Ensure that there is always part of the structure of the spacer between the first wall and the electrode terminal, which can be used to separate the first wall and the electrode terminal, reduce the risk of direct contact between the electrode terminal and the first wall, and improve the safety of the battery cell.

[0009] In some embodiments, the first wall is provided with an electrode lead-out hole, the electrode terminal includes a terminal body, a first limiting portion and a second limiting portion, at least part of the terminal body is accommodated in the electrode lead-out hole, and the first limiting portion and the second limiting portion each protrude from an outer peripheral surface of the terminal body. In the thickness direction of the first wall, part of the first wall between the first limiting portion and the second limiting portion has at least part of the reinforcing portion clamped between the first wall and the first limiting portion.

[0010] In the above technical solution, the reinforcing portion is arranged between the first limiting portion and the first wall, i.e., the reinforcing portion is arranged on one side of the first limiting portion in the thickness direction, which can reduce the damage degree of the first limiting portion to the spacer, thereby facilitating to improve the structural integrity of the spacer and ensuring that the spacer can insulate and separate the first limiting portion from the first wall.

[0011] In some embodiments, the first limiting portion is arranged on the side of the first wall away from the electrode assembly.

[0012] In the above technical solution, by arranging the reinforcing portion between the first limiting portion and the first wall, the risk of damage to the spacer due to the formation of the first limiting portion can be reduced, thereby facilitating to improve the insulation reliability between the spacer, the electrode terminal and the first wall and improving the safety of the battery monomer.

[0013] In some embodiments, the reinforcing portion is at least partially located in the electrode lead-out hole and clamped between the terminal body and the first wall.

[0014] In the above technical solution, the reinforcing portion is arranged between the terminal body and the first wall, which reduces the risk of crushing the structure of the spacer between the terminal body and the first wall, ensures that the spacer can still separate the terminal body from the first wall after the electrode terminal is processed, reduces the probability of transferring electric energy from the terminal body to the first wall, and improves the safety of the battery monomer.

[0015] In some embodiments, the reinforcing portion is in a ring structure.

[0016] In the above technical solution, by arranging the reinforcing portion in a ring structure, the reinforcing portion can be arranged corresponding to more areas of the spacer prone to deformation and damage, thereby further improving the compression resistance and reliability of the spacer and reducing the probability of direct contact between the electrode terminal and the first wall due to deformation and damage of the spacer.

[0017] In some embodiments, the spacer further includes a body portion, the reinforcing portion is connected to the body portion, at least part of the reinforcing portion is located between the body portion and the electrode terminal, and the yield strength of the reinforcing portion is greater than the yield strength of the body portion.

[0018] In the technical solution, at least part of the reinforcing part is arranged between the body part and the electrode terminal, so that the electrode terminal is in contact with the reinforcing part first, and the force is transmitted to the reinforcing part, the reinforcing part is not easy to be deformed and damaged, and the reinforcing part can reduce the force transmitted to the body part, thereby reducing the possibility of deformation and damage of the body part, thereby improving the overall reliability of the spacer.

[0019] In some embodiments, the body part is provided with a recess, and at least part of the reinforcing part is accommodated in the recess.

[0020] In the technical solution, by arranging the recess on the body part and arranging at least part of the reinforcing part in the recess, the protrusion of the reinforcing part relative to the body part is reduced, thereby reducing the possibility of the spacer being too large in size due to the presence of the reinforcing part, and having strong practicability.

[0021] In some embodiments, the reinforcing part includes a plurality of reinforcing sub-parts, and the plurality of reinforcing sub-parts are arranged at intervals on the body part.

[0022] In the technical solution, by arranging a plurality of reinforcing sub-parts, the structural strength of the spacer at different positions can be improved, the risk of deformation and damage of the spacer due to processing of the electrode terminal is further reduced, and the structural reliability of the spacer is improved.

[0023] In some embodiments, the reinforcing part includes a metal material.

[0024] In the technical solution, the reinforcing part can have strong yield strength, thereby reducing the risk of deformation and damage of the spacer and reducing the risk of direct contact between the electrode terminal and the first wall.

[0025] In some embodiments, the metal material includes at least one of stainless steel, aluminum and copper.

[0026] In the technical solution, at least one of stainless steel, aluminum and copper is arranged in the reinforcing part, so that the reinforcing part has strong yield strength, thereby reducing the risk of deformation and damage of the spacer.

[0027] In some embodiments, the yield strength at each position of the spacer is not less than 30MPa.

[0028] In the technical solution, since the yield strength at each position of the spacer is not less than 30MPa, the reinforcing part has strong yield strength at each position, thereby further reducing the risk of deformation and damage of the spacer during processing of the electrode terminal, thereby reducing the risk of direct contact between the electrode terminal and the first wall, and improving the safety of the battery cell.

[0029] In some embodiments, the spacer includes a plastic material, which includes at least one of polyphenylene sulfide and liquid crystal polymer.

[0030] In the above technical solution, polyphenylene sulfide and liquid crystal polymer are plastic materials with high yield strength, with polyphenylene sulfide having a yield strength of 75 MPa and liquid crystal polymer having a yield strength of 150 MPa. Therefore, by incorporating at least one of polyphenylene sulfide and liquid crystal polymer into the separator, it can be ensured that the separator has high yield strength, thereby reducing the risk of deformation and damage to the separator.

[0031] In some embodiments, at least a portion of the structure of the spacer has a tensile strength Q2, which satisfies: Q2≥100MPa.

[0032] In the above technical solution, by controlling the tensile strength of at least a portion of the structure in the separator to be not less than 100MPa, the separator can have strong toughness, thereby reducing the probability of the separator breaking under external force and ensuring that the separator can always separate the first wall from the electrode terminal, thereby improving the safety of the battery cell.

[0033] Secondly, embodiments of this application provide a battery, including the battery cell in any of the foregoing embodiments.

[0034] Thirdly, some embodiments of this application provide an electrical device including a battery cell in any embodiment, the battery cell being used to provide electrical energy. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of some embodiments of this application, the accompanying drawings used in some embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0036] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0037] Figure 2 Explosion diagrams of batteries provided for some embodiments of this application;

[0038] Figure 3 for Figure 2 The diagram shows the structure of the battery module.

[0039] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in some embodiments of this application;

[0040] Figure 5Exploded views of partial structures in a single battery cell provided in some embodiments of this application;

[0041] Figure 6 This is a schematic cross-sectional view of the structure of a battery cell provided in some embodiments of this application;

[0042] Figure 7 for Figure 6 A magnified structural diagram of region Q in the middle region;

[0043] Figure 8 Enlarged partial cross-sectional views of a single battery cell provided in some embodiments of this application;

[0044] Figure 9 This is a partial cross-sectional enlarged view of a battery cell provided in some embodiments of this application.

[0045] The accompanying drawings are not drawn to scale.

[0046] Marker explanation:

[0047] 1000, Vehicle; 2000, Battery; 2010, Housing; 2011, First Housing Section; 2012.

[0048] Second housing section; 2013, housing section; 3000, controller; 4000, motor; 5000, battery module;

[0049] 1. Battery cell; 11. Casing; 111. Housing; 112. End cap; 12. Electrode assembly;

[0050] 13. Electrode terminal; 131. Terminal body; 132. First limiting part; 133. Second limiting part; 14. Isolating member; 141. Reinforcing part; 1411. Reinforcing sub-part; 142. Body part; 15. Current collector; 16. Sealing member; 17. Lower plastic; 18. Sealing plate;

[0051] B1, First Wall

[0052] HL, electrode lead-out hole;

[0053] A. concave part;

[0054] Z, thickness direction. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of some embodiments of this application clearer, the technical solutions of some embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0057] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0060] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in some embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0061] In this application, "multiple" means two or more (including two).

[0062] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0063] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0064] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0065] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0067] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] As an example, the positive electrode active material may include at least one of the following materials: lithium 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 positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0072] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0073] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0074] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0075] In some embodiments, the electrode assembly further includes an isolation portion disposed between the positive and negative electrodes.

[0076] In some embodiments, the isolation portion is an isolation membrane. This application does not impose any particular limitation on the type of isolation membrane; any known porous structure isolation membrane with good chemical and mechanical stability can be selected.

[0077] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0078] In some embodiments, the isolation section is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0079] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0080] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0081] In some implementations, the electrode assembly is a stacked structure.

[0082] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0083] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0084] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0085] In some embodiments, a battery cell may include functional components such as electrode terminals, which may be electrically connected to an electrode assembly to output or input electrical energy into the battery cell.

[0086] In some embodiments, the battery cell may further include a separator for insulating and separating the electrode assembly from the housing to reduce the risk of leakage current in the battery cell. Exemplarily, the separator may be made of plastic.

[0087] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0088] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0089] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0090] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0091] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0092] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0093] The inventors noticed that in the battery cells after they were manufactured, the separators were prone to deformation and damage, causing the electrode terminals to come into direct contact with the outer casing, which posed a safety hazard.

[0094] The inventors discovered through research that during the manufacturing process of battery cells, the structure of the electrode terminals needs to be adjusted through processes such as stamping to ensure their fixed position. However, during the processing of the electrode terminals, they are prone to contact with the separator, transferring some of the external force to the separator. This increases the risk of deformation and damage to the separator, potentially leading to direct contact between the electrode terminals and the outer casing, thus posing a safety hazard.

[0095] In view of this, some embodiments of this application provide a battery cell, a battery, and an electrical device, which reduce the risk of deformation and damage to the separator caused by electrode terminal processing by adjusting the yield strength of at least a portion of the structure in the separator, thereby improving the safety of the battery cell.

[0096] Some embodiments of this application incorporate a stress-barrier structure in the tab area, spaced apart from the coating area. This reduces the stress transmitted to the interface between the tab area and the coating area during tab deformation, thereby lowering the risk of cracking or wrinkling in the coating area of ​​the current collector and reducing the risk of the active material layer on the coating area peeling off, thus improving product yield.

[0097] The technical solutions described in some embodiments of this application are applicable to batteries and electrical devices using batteries.

[0098] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. Some embodiments of this application do not impose special limitations on the above-mentioned electrical devices.

[0099] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0100] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0101] like Figure 1 As shown, a battery 2000 is installed inside the vehicle 1000. The battery 2000 can be located at the bottom, head, or tail of the vehicle 1000. The battery 2000 can be used to power the vehicle 1000; for example, the battery 2000 can serve as the operating power source for the vehicle 1000.

[0102] The vehicle 1000 may also include a controller 3000 and a motor 4000. The controller 3000 is used to control the battery 2000 to supply power to the motor 4000, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0103] In some embodiments of this application, the battery 2000 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0104] Figure 2 This is an exploded schematic diagram of a battery provided for some embodiments of this application.

[0105] like Figure 2 As shown, the battery 2000 includes a housing 2010 and battery cells (not shown in the figure), with the battery cells housed within the housing 2010.

[0106] The housing 2010 is used to accommodate individual battery cells, and the housing 2010 can have various structures. In some embodiments, the housing 2010 may include a first housing portion 2011 and a second housing portion 2012, which overlap each other, and together define a receiving portion 2013 for accommodating individual battery cells. The second housing portion 2012 may be a hollow structure with one end open, and the first housing portion 2011 may be a plate-like structure, covering the open side of the second housing portion 2012 to form a housing 2010 with the receiving portion 2013; alternatively, both the first housing portion 2011 and the second housing portion 2012 may be hollow structures with one side open, with the open side of the first housing portion 2011 covering the open side of the second housing portion 2012 to form a housing 2010 with the receiving portion 2013. Of course, the first box section 2011 and the second box section 2012 can be of various shapes, such as cylinders, cuboids, etc.

[0107] To improve the sealing performance after the first housing part 2011 and the second housing part 2012 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 2011 and the second housing part 2012.

[0108] Assuming that the first box section 2011 covers the top of the second box section 2012, the first box section 2011 can also be called the upper box cover, and the second box section 2012 can also be called the lower box.

[0109] In battery 2000, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells are connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the whole assembly of multiple battery cells is housed in housing 2010. Alternatively, multiple battery cells can first be connected in series, parallel, or a combination thereof to form battery module 5000, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form a whole assembly, which is then housed in housing 2010.

[0110] Figure 3 for Figure 2 The diagram shows the structure of the battery module. Figure 3 As shown, in some embodiments, there are multiple battery cells 1, which are first connected in series, parallel, or mixed to form a battery module 5000. The multiple battery modules 5000 are then connected in series, parallel, or mixed to form a whole, which is housed in the housing 2010.

[0111] Multiple battery cells 1 in the battery module 5000 are electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 1 in the battery module.

[0112] Figure 4 Here are some exploded structural diagrams of battery cell 1 provided in some embodiments of this application, such as... Figure 4 As shown, the battery cell 1 includes a housing 11 and an electrode assembly 12, with the electrode assembly 12 housed within the housing 11.

[0113] The electrode assembly 12 is the core component for the charging and discharging function of the battery cell 1. It includes a positive electrode, a negative electrode, and a separator. The positive and negative electrodes have opposite polarities, and the separator is used to insulate and isolate the positive and negative electrodes. The electrode assembly 12 mainly relies on the movement of metal ions between the positive and negative electrodes to operate.

[0114] The outer shell 11 is a hollow structure, with an internal cavity for accommodating the electrode assembly 12 and the electrolyte. The outer shell 11 can be of various shapes, such as a cylinder or a cuboid. The shape of the outer shell 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, a cylindrical outer shell can be used; if the electrode assembly 12 is a cuboid structure, a cuboid outer shell can be used.

[0115] In some embodiments, the housing 11 includes a housing 111 and an end cap 112.

[0116] End cap 112 is sealingly connected to housing 111 to form a sealed space for accommodating electrode assembly 12 and electrolyte. In some examples, housing 111 has an opening at one end, and end cap 112 is configured as one that covers the opening of housing 111. In other examples, housing 111 has openings at both opposite ends, and two end caps 112 are configured, with each end cap 112 covering one of the two openings of housing 111.

[0117] Regardless of the specific type, the shape of the end cap 112 can be adapted to the shape of the housing 111 to fit the housing 111. Optionally, the end cap 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 112 is not easily deformed when subjected to compression and impact, so that the battery cell 1 can have higher structural strength and the safety performance can also be improved.

[0118] The housing 111 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 111 can be determined according to the specific shape and size of the electrode assembly 12. The material of the housing 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and some embodiments of this application do not impose special limitations on this.

[0119] In some embodiments, the end cap 112 may be provided with functional components such as electrode terminals 13. The electrode terminals 13 can be used to electrically connect with the electrode assembly 12 for outputting or inputting electrical energy of the battery cell 1.

[0120] In some embodiments, the battery cell may further include a separator 14 for insulating and separating the electrode assembly 12 from the housing 11 to reduce the risk of leakage in the battery cell 1. Exemplarily, the separator 14 may be made of plastic.

[0121] In some embodiments, the battery cell 1 further includes a current collector 15, which is used to realize the electrical connection between the electrode assembly 12 and the electrode terminal 13 to realize the input or output of electrical energy.

[0122] In some embodiments, the battery cell 1 further includes a sealing plate 18, which is connected to the side of the electrode terminal 13 away from the electrode assembly 12. A busbar component can be connected to the sealing plate 18 to realize the parallel, series or mixed connection of multiple battery cells 1.

[0123] The specific structure of battery cell 1 is described in detail below with reference to the accompanying drawings. Please refer to... Figures 4 to 5 The battery cell 1 includes a first wall B1, an electrode terminal 13, and a separator 14. The electrode terminal 13 is mounted on the first wall B1. At least a portion of the separator 14 is disposed between the first wall B1 and the electrode terminal 13. At least a portion of the separator 14 has a yield strength Q1, which satisfies: Q1≥30MPa.

[0124] The first wall B1 is located on the outer casing 11. Exemplarily, the outer casing 11 may include an end cap 112 and a housing 111. The end cap 112 is sealed to the housing 111 to form a sealed space for accommodating the electrode assembly 12 and the electrolyte. The first wall B1 may be the end cap 112 or a wall surface in the housing 111 corresponding to the end cap 112. This embodiment of the application does not limit this.

[0125] Electrode terminals 13 are disposed on the first wall B1 and can be electrically connected to the electrode assembly 12 for outputting or inputting electrical energy of the battery cell 1. An isolator 14 is at least partially located between the first wall B1 and the electrode assembly 12. The isolator 14 is used to insulate the electrode terminals 13 from the first wall B1, thereby reducing the probability of electrical energy in the battery cell 1 being transferred to the first wall B1, reducing the leakage current of the battery cell 1, and improving the safety of the battery cell 1.

[0126] The specific dimensions and structure of the electrode terminal 13 and the isolator 14 are not limited in this embodiment. Exemplarily, the electrode terminal 13 penetrates the first wall B1 and extends into the housing 11 to facilitate electrical connection between the electrode terminal 13 and the electrode assembly 12. The isolator 14 may be an annular structure and is sleeved on the electrode terminal 13.

[0127] During the manufacturing process of the battery cell 1, the separator 14 is prone to deformation and damage due to the processing of the electrode terminals 13. For example, after the electrode terminals 13 penetrate the first wall B1, they can be flanged and riveted using a stamping process to keep their position fixed on the first wall B1, reducing the probability of slippage. During the stamping process of the electrode terminals 13, they may come into contact with the separator 14 under the influence of external forces, transferring some of the force to the separator 14, causing it to crush or crack. In this case, the separator 14 may not be able to effectively insulate the electrode terminals 13 from the first wall B1, resulting in direct contact between the electrode terminals 13 and the first wall B1 and the transfer of some electrical energy to the casing 11, increasing the risk of leakage in the battery cell 1 and posing a safety hazard.

[0128] Based on this, the material of at least a portion of the structure in the spacer 14 has been adjusted in this embodiment, such that the yield strength of at least a portion of the structure in the spacer 14 is not less than 30 MPa. Yield strength refers to the yield limit of a material when it yields, that is, the stress resisting minute plastic deformation. Generally, the greater the yield strength, the greater the maximum force the structure can withstand before plastic deformation.

[0129] The present application does not limit the method for determining the yield strength of at least a portion of the structure in the spacer 14. Exemplarily, the yield strength can be determined using a graphical method or a pointer method. Taking the graphical method as an example, a force-clamp displacement diagram is plotted using an automatic recording device during the test. It is required that the stress represented by each mm of the force axis is generally less than 10 N / mm. 2 The curve must be plotted at least to the end of the yield stage. A constant force Fe is determined on the curve to establish the yield plateau, and the specific value of the yield strength Re is calculated using the formula: Re = Fe / So.

[0130] As an example, the yield strength of at least a portion of the structure in the spacer 14 can be 30 MPa, 32 MPa, 35 MPa, 50 MPa, or 100 MPa.

[0131] The specific material composition of the internal structure of the isolator 14 is not limited in this embodiment. The materials used in different parts of the isolator 14 may be the same or different. Furthermore, all parts of the isolator 14 may be made of insulating material, or the isolator 14 may have some parts made of conductive material and some parts made of insulating material, as long as the isolator 14 can insulate and separate the electrode terminal 13 from the first wall B1.

[0132] In this embodiment of the application, by setting the yield strength of at least a portion of the structure in the separator 14 to not less than 30 MPa, the risk of the separator 14 being completely crushed during the processing of the electrode terminal 13 is reduced, the yield of the separator 14 after the battery cell 1 is prepared is improved, the risk of the electrode terminal 13 directly contacting the first wall B1 is reduced, and the safety of the battery cell 1 is improved.

[0133] It should be noted that the yield strength of all structures in the isolation member 14 may be not less than 30 MPa, or only some structures in the isolation member 14 may have a yield strength not less than 30 MPa, while the yield strength of other structures may be less than 30 MPa. This application embodiment does not impose any restrictions on this.

[0134] In addition to the separator 14 and electrode terminals, the battery cell 1 may also have other functional components at the first wall B1. For example, the first wall B1 may also include a seal 16 and a lower plastic 17.

[0135] In some embodiments, please refer to Figures 4 to 7 The isolation member 14 has a reinforcing part 141, at least a portion of which is sandwiched between the electrode terminal 13 and the first wall B1.

[0136] The "reinforcing part 141" mentioned in this application embodiment refers to a structure with high yield strength. Specifically, the yield strength of the reinforcing part 141 is not less than 30 MPa. This application embodiment does not limit the material composition of the reinforcing part 141. The reinforcing part 141 can be an insulating material or a conductive material.

[0137] The reinforcing part 141 is located inside the isolation member 14. The reinforcing part 141 may be completely located inside the isolation member or at least partially exposed. The term "exposed" in this embodiment means that the reinforcing part 141 is not obstructed by other structures in the isolation member 14, that is, the reinforcing part 141 can be in direct contact with the external environment.

[0138] The reinforcing portion 141 is at least partially sandwiched between the electrode terminal 13 and the first wall B1. When the reinforcing portion 141 is exposed relative to the isolating member 14, it can be exposed towards the electrode terminal 13 or towards the first wall B1. It should be noted that when the reinforcing portion 141 is exposed towards the electrode terminal 13, it can be in direct contact with the electrode terminal 13, or there can be a certain gap between them. When the reinforcing portion 141 is exposed towards the first wall B1, it can be in direct contact with the first wall B1, or there can be a certain gap between them.

[0139] During the processing of electrode terminal 13, electrode terminal 13 is easily crushed along with the first wall B1 into the separator 14 under external force. Based on this, the embodiment of this application includes a reinforcing portion 141 sandwiched between electrode terminal 13 and the first wall B1. This reduces the risk of complete crushing damage to the structure within the separator 14 located between electrode terminal 13 and the first wall B1 due to the compression between the electrode terminal 13 and the first wall B1 during the processing of electrode terminal 13. This ensures that a portion of the structure from the separator 14 is always present between the first wall B1 and electrode terminal 13, effectively separating them and reducing the risk of direct contact between the electrode terminal 13 and the first wall B1, thus improving the safety of the battery cell 1.

[0140] In some embodiments, such as Figure 7 As shown, the first wall B1 is provided with an electrode lead-out hole HL, and the electrode terminal 13 includes a terminal body 131, a first limiting part 132 and a second limiting part 133. At least a portion of the terminal body 131 is accommodated in the electrode lead-out hole HL, and the first limiting part 132 and the second limiting part 133 both protrude from the outer peripheral surface of the terminal body 131.

[0141] In the thickness direction Z of the first wall B1, a portion of the first wall B1 is located between the first limiting portion 132 and the second limiting portion 133, and at least a portion of the reinforcing portion 141 is sandwiched between the first wall B1 and the first limiting portion 132.

[0142] An electrode lead-out hole HL is provided through the first wall B1, and the electrode lead-out hole HL is used to accommodate part of the structure in the electrode terminal 13. The embodiments of this application do not limit the structural dimensions of the electrode lead-out. Exemplarily, the electrode lead-out hole HL can be a circular hole, a square hole, or other polygonal hole.

[0143] The terminal body 131 is the main part of the electrode terminal 13, and the terminal body 131 is at least partially located within the electrode lead-out hole HL. The shape of the terminal body 131 can be adapted to the shape of the electrode lead-out hole HL. For example, the electrode lead-out hole HL is a circular hole structure, and the terminal body 131 is a cylindrical structure.

[0144] The first limiting part 132 and the second limiting part 133 both protrude from the outer peripheral surface of the terminal body 131. The terminal body 131, the first limiting part 132, and the second limiting part 133 can be made of the same material or different materials. For example, the terminal body 131, the first limiting part 132, and the second limiting part 133 are an integral structure, and the first limiting part 132 and the second limiting part 133 protrude relative to the terminal body 131 by stamping and flanging.

[0145] Along the thickness direction Z of the first wall B1, the first limiting portion 132 and the second limiting portion 133 are located on opposite sides of the first wall B1. In other words, one of the first limiting portion 132 and the second limiting portion 133 is located inside the outer casing 11, and the other is located outside the outer casing 11. The presence of the first limiting portion 132 and the second limiting portion 133 can improve the reliability of the relative position between the electrode terminal 13 and the first wall B1, and reduce the probability of the electrode terminal 13 detaching from the first wall B1 in the thickness direction Z.

[0146] In the process of preparing the battery cell 1, the electrode terminal 13 is usually first stamped and flanged to form one of the first limiting part 132 and the second limiting part 133. Then the electrode terminal 13 is passed through the electrode lead-out hole HL. After that, the separator 14 is sleeved on the electrode terminal 13. Finally, the electrode terminal 13 is stamped and flanged to form the other of the first limiting part 132 and the second limiting part 133.

[0147] During the second stamping and flanging process of the electrode terminal 13, the isolation member 14 is easily squeezed by the first limiting part 132 in the thickness direction Z. Therefore, in this embodiment, the reinforcing part 141 is disposed between the first limiting part 132 and the first wall B1, that is, the reinforcing part 141 is disposed on one side of the first limiting part 132 along the thickness direction Z. This can reduce the degree of damage caused by the first limiting part 132 to the isolation member 14, thereby improving the structural integrity of the isolation member 14 and ensuring that the isolation member 14 can insulate and separate the first limiting part 132 from the first wall B1.

[0148] In some embodiments, such as Figure 7 As shown, the first limiting part 132 is disposed on the side of the first wall B1 away from the electrode assembly 12, that is, the first limiting part 132 is located outside the outer shell 11.

[0149] Normally, the second stamping and flanging of the electrode terminal 13 is a stamping process performed on the structure of the electrode terminal 13 located outside the housing 11. In other words, the electrode terminal 13 can form the first limiting part 132 after the second stamping and flanging.

[0150] Based on this, the structure of the separator 14 located closer to the first limiting portion 132 is more susceptible to external forces, potentially leading to crushing deformation. Therefore, this embodiment of the application, by placing the reinforcing portion 141 between the first limiting portion 132 and the first wall B1, reduces the risk of damage to the separator 14 due to the formation of the first limiting portion 132. This improves the insulation reliability of the separator 14 relative to the electrode terminal 13 and the first wall B1, thereby enhancing the safety of the battery cell 1.

[0151] In some embodiments, please refer to Figure 8 The reinforcing part 141 is at least partially located in the electrode lead-out hole HL and sandwiched between the terminal body 131 and the first wall B1.

[0152] The reinforcing portion 141 is at least partially located within the electrode lead-out hole HL. The reinforcing portion 141 may be completely located inside the insulating member 14 and may be exposed toward the terminal body 131 or the first wall B1. When the reinforcing portion 141 is exposed toward the terminal body 131, there may be a certain gap between the reinforcing portion 141 and the terminal body 131.

[0153] During the processing of electrode terminal 13, the structure in the separator 14 located within the electrode lead-out hole HL will come into contact with the terminal body 131 and may deform and break under the influence of force. Therefore, in this embodiment, the reinforcing part 141 is provided between the terminal body 131 and the first wall B1 to reduce the risk of the structure in the separator 14 located between the terminal body 131 and the first wall B1 being crushed. This ensures that after the electrode terminal 13 is processed, the separator 14 can still separate the terminal body 131 from the first wall B1, reducing the probability of electrical energy being transferred to the first wall B1 through the terminal body 131 and improving the safety of the battery cell 1.

[0154] It should be noted that, in different embodiments, the reinforcing part 141 may be located only between the terminal body 131 and the first wall B1, or it may be located only between the first limiting part 132 and the first wall B1. Alternatively, the reinforcing part 141 may be partially located between the terminal body 131 and the first wall B1, and partially located between the first limiting part 132 and the first wall B1. This application embodiment does not impose any restrictions on this.

[0155] In some embodiments, combined with Figure 4 and Figure 7 As shown, the reinforcing part 141 has a ring-shaped structure.

[0156] As described above, the reinforcing part 141 can be located between the terminal body 131 and the first wall B1, or between the first limiting part 132 and the first wall B1. When the reinforcing part 141 is located between the terminal body 131 and the first wall B1, the reinforcing part 141 has a ring-shaped structure, which allows the reinforcing part 141 to be fitted onto the outside of the terminal body 131, improving the ability of the isolator 14 to resist the impact of the terminal body 131 at different positions and reducing the damaging effect of the terminal body 131 on the isolator 14.

[0157] When the reinforcing part 141 is located between the first limiting part 132 and the first wall B1, the reinforcing part 141 can also be configured as a ring structure, so that the reinforcing part 141 can be configured to correspond with more structures in the first limiting part 132. For example, the projection of the first limiting part 132 in the thickness direction Z is located within the outer contour of the projection of the reinforcing part 141 in the thickness direction Z. This design allows more areas in the isolation member 14 that correspond to the structure of the first limiting part 132 to be structurally reinforced by the reinforcing part 141, reducing the destructive impact of the first limiting part 132 on the isolation member 14.

[0158] In summary, by setting the reinforcing part 141 as a ring structure, the reinforcing part 141 can be arranged to correspond to more areas of the isolator 14 that are prone to deformation and damage, thereby further improving the compressive strength and reliability of the isolator 14 and reducing the probability that the electrode terminal 13 will directly contact the first wall B1 due to deformation and damage of the isolator 14.

[0159] In some embodiments, such as Figure 7 As shown, the isolation member 14 also includes a body portion 142, a reinforcing portion 141 connected to the body portion 142, at least a portion of the reinforcing portion 141 being located between the body portion 142 and the electrode terminal 13, and the yield strength of the reinforcing portion 141 being greater than the yield strength of the body portion 142.

[0160] The body portion 142 is the main part of the separator 14. The embodiments of this application do not limit the type of material used for the body portion 142. Exemplarily, the body portion 142 includes a plastic material.

[0161] The yield strength of the reinforcing part 141 is greater than that of the body part 142, meaning that the reinforcing part 141 can withstand a greater force than the body part 142. Specifically, the yield strength of the reinforcing part 141 is not less than 30 MPa. The yield strength of the body part 142 can be less than 30 MPa, or greater than or equal to 30 MPa; this embodiment does not impose any limitation on this.

[0162] Because the reinforcing part 141 has a greater yield strength than the main body 142, it is less prone to deformation and breakage due to external forces compared to the main body 142. Based on this, in this embodiment, at least a portion of the reinforcing part 141 is disposed between the main body 142 and the electrode terminal 13, so that the electrode terminal 13 preferentially contacts the reinforcing part 141 and transmits the force to it. The reinforcing part 141 is less prone to deformation and breakage, and it can reduce the magnitude of the force transmitted to the main body 142, thereby reducing the possibility of deformation and breakage of the main body 142 and improving the overall reliability of the isolator 14.

[0163] In some embodiments, such as Figure 7 and Figure 8 As shown, the main body 142 is provided with a recess A, and at least a portion of the reinforcing part 141 is accommodated in the recess A.

[0164] The body portion 142 is provided with a recess A. The recess A can be formed by removing material from the body portion 142. The size, shape, and specific location of the recess A are not limited in this embodiment. Exemplarily, the recess A can be disposed within the electrode lead-out hole HL and located on the side of the body portion 142 facing the terminal body 131. Alternatively, the recess A can also be disposed on the side of the first wall B1 away from the electrode assembly 12 and located on the side of the body portion 142 facing the first limiting portion 132. In this case, the first limiting portion 132 can be partially accommodated within the recess A.

[0165] The recess A is used to accommodate at least a portion of the reinforcing portion 141. There may be one or more recesses A. The reinforcing portion 141 may be completely located within the recess A, or it may be located only partially within the recess A and partially outside the recess A.

[0166] This embodiment of the application provides a recess A on the body portion 142 and at least partially provides a reinforcing portion 141 in the recess A, thereby reducing the degree of protrusion of the reinforcing portion 141 relative to the body portion 142, thereby reducing the possibility that the spacer 14 may have excessively large local or overall size due to the presence of the reinforcing portion 141, and has strong practicality.

[0167] In some alternative embodiments, such as Figure 7 As shown, the thickness of the reinforcing part 141 is H, where H satisfies: 0.2mm ≤ H ≤ 0.5mm. For example, H is one of 0.2mm, 0.3mm, 0.4mm, and 0.5mm.

[0168] If the thickness of the reinforcing part 141 is too large, it can easily lead to the overall or partial dimensions of the isolator 14 being too large, which is not conducive to the mating and installation between the isolator 14 and the electrode terminal 13. Based on this, the embodiment of this application sets the thickness of the reinforcing plate to no more than 0.5 mm, reducing the risk of the isolator 14 being too large overall or partially, and ensuring the relative mating between the isolator 14 and the electrode terminal 13.

[0169] If the thickness of the reinforcing part 141 is too small, it can easily lead to insufficient overall strength of the reinforcing part 141, and the isolation member 14 will still have a large risk of deformation and breakage. Based on this, the embodiment of this application sets the thickness of the reinforcing part 141 to not less than 0.2 mm, so that the reinforcing part 141 has a certain thickness to ensure its strength and reduce the probability of deformation and breakage of the isolation member 14.

[0170] In some embodiments, the reinforcing portion 141 includes a plurality of reinforcing sub-portions 1411, which are spaced apart on the body portion 142.

[0171] Different reinforcing sub-parts 1411 are disposed at different positions on the isolator 14 to enhance the strength of the isolator 14 at different positions. The different reinforcing sub-parts 1411 may have the same shape and size or different shapes and sizes. The embodiments of this application do not limit the number, shape, size, and specific position of the reinforcing sub-parts 1411. Exemplarily, some reinforcing sub-parts 1411 are disposed between the first limiting part 132 and the first wall B1, and some reinforcing sub-parts 1411 are disposed in the electrode lead-out hole HL and located between the terminal body 131 and the first wall B1.

[0172] In this embodiment of the application, by providing multiple reinforcing sub-parts 1411, the structural strength of the isolator 14 at different positions can be improved, further reducing the risk of deformation and damage to the isolator 14 due to the processing of the electrode terminal 13, and improving the structural reliability of the isolator 14.

[0173] In some embodiments, the reinforcing part 141 includes a metallic material.

[0174] Compared to other materials, metallic materials generally have a higher yield strength, thus enabling them to withstand greater forces. Based on this, the embodiments of this application include a metallic material in the reinforcing part 141, thereby ensuring that the reinforcing part 141 has a higher yield strength. This reduces the risk of deformation and damage to the isolator 14 and the risk of direct contact between the electrode terminal 13 and the first wall B1.

[0175] It should be noted that metallic materials are generally conductive. Therefore, in order to reduce the risk of electrical connection between the electrode terminal 13 and the first wall B1, the portion of the insulating member 14 located between the electrode terminal 13 and the first wall B1, in addition to including the reinforcing part 141, also needs to include other insulating materials.

[0176] In some embodiments, the metallic material includes at least one of stainless steel, aluminum, and copper.

[0177] Stainless steel, aluminum, and copper typically possess high yield strength. Stainless steel generally has a yield strength of at least 200 MPa, aluminum has a yield strength of 361 MPa, and copper's yield strength ranges from 343 MPa to 369 MPa. Therefore, by incorporating at least one of stainless steel, aluminum, or copper into the reinforcing part 141, the reinforcing part 141 can achieve a high yield strength, thereby reducing the risk of deformation and damage to the spacer 14.

[0178] In some embodiments, the yield strength at each location of the spacer 14 is not less than 30 MPa. The yield strength at different locations of the spacer 14 may be the same or different, and the material composition at different locations of the spacer 14 may be the same or different.

[0179] In this embodiment, since the yield strength of each part of the separator 14 is not less than 30MPa, it can be ensured that each part of the separator 14 has a strong yield strength. This further reduces the risk of deformation and damage to the separator 14 during the processing of the electrode terminal 13, thereby reducing the risk of direct contact between the electrode terminal 13 and the first wall B1 and improving the safety of the battery cell 1.

[0180] In some embodiments, the separator 14 comprises a plastic material, which includes at least one of polyphenylene sulfide and liquid crystal polymer.

[0181] Polyphenylene sulfide (PPS) and liquid crystal polymer (LCD) are plastic materials with relatively high yield strength. PPS has a yield strength of 75 MPa, while LCD has a yield strength of 150 MPa. Therefore, by incorporating at least one of PPS or LCD into the spacer 14, it is possible to ensure that the spacer 14 has a high yield strength, thereby reducing the risk of deformation and damage to the spacer 14.

[0182] In some embodiments, at least a portion of the structure of the spacer 14 has a tensile strength Q2, which satisfies: Q2≥100MPa.

[0183] Tensile strength refers to the stress at which a material undergoes maximum uniform plastic deformation, i.e., the maximum load-bearing capacity of a material under static tensile conditions. Generally, a higher tensile strength indicates greater structural toughness and a lower likelihood of brittle fracture.

[0184] In this embodiment, by controlling the tensile strength of at least a portion of the structure in the separator 14 to be not less than 100 MPa, the separator 14 can have strong toughness, thereby reducing the probability of the separator 14 breaking under external force and ensuring that the separator 14 can always separate the first wall B1 from the electrode terminal 13, thereby improving the safety of the battery cell 1.

[0185] Secondly, embodiments of this application provide a battery, including the battery cell 1 in any of the foregoing embodiments.

[0186] It should be noted that the battery provided in this application embodiment has the beneficial effects of battery cell 1 in any of the foregoing embodiments. For details, please refer to the foregoing description of the beneficial effects of battery cell 1. This application embodiment will not repeat the details.

[0187] Thirdly, please refer to the following: Figures 4 to 7 Some embodiments of this application provide an electrical device, including a battery cell 1 in any embodiment, the battery cell 1 being used to provide electrical energy.

[0188] According to some embodiments of this application, the battery cell 1 includes a first wall B1, an electrode terminal 13, and a separator 14. The first wall B1 is provided with an electrode lead-out hole HL. The electrode terminal 13 includes a terminal body 131, a first limiting part 132, and a second limiting part 133. The terminal body 131 is at least partially accommodated in the electrode lead-out hole HL. The first limiting part 132 and the second limiting part 133 protrude from the outer peripheral surface of the terminal body 131. In the thickness direction Z of the first wall B1, a portion of the first wall B1 is located between the first limiting part 132 and the second limiting part 133. The first limiting part 132 is located on the side of the first wall B1 away from the electrode assembly 12.

[0189] The isolation member 14 includes a body portion 142 and a reinforcing portion 141. The reinforcing portion 141 is sandwiched between the first limiting portion 132 and the first wall B1, and is located on the side of the body portion 142 facing the first limiting portion 132. The body portion 142 has a recess A, and at least a portion of the reinforcing portion 141 is accommodated in the recess A. The yield strength of the isolation member 14 at each location is not less than 30 MPa.

[0190] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0191] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: First wall; Electrode terminals are mounted on the first wall; as well as An isolator, at least a portion of which is disposed between the first wall and the electrode terminal, and at least a portion of the isolator having a yield strength Q1, wherein Q1 satisfies: Q1≥30MPa.

2. The battery cell according to claim 1, characterized in that, The isolation member has a reinforcing portion, at least a portion of which is sandwiched between the electrode terminal and the first wall.

3. The battery cell according to claim 2, characterized in that, The first wall is provided with electrode lead-out holes; The electrode terminal includes a terminal body, a first limiting portion and a second limiting portion. At least a portion of the terminal body is accommodated in the electrode lead-out hole, and both the first limiting portion and the second limiting portion protrude from the outer peripheral surface of the terminal body. In the thickness direction of the first wall, a portion of the first wall is located between the first limiting portion and the second limiting portion; At least a portion of the reinforcing part is sandwiched between the first limiting part and the first wall.

4. The battery cell according to claim 3, characterized in that, The first limiting part is disposed on the side of the first wall opposite to the electrode assembly of the battery cell.

5. The battery cell according to claim 2, characterized in that, The first wall is provided with an electrode lead-out hole, and the electrode terminal includes a terminal body that is at least partially accommodated in the electrode lead-out hole. The reinforcing part is at least partially located in the electrode lead-out hole and is sandwiched between the terminal body and the first wall.

6. The battery cell according to claim 2, characterized in that, The reinforcing part has a ring-shaped structure.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The isolation member further includes a body portion, a reinforcing portion connected to the body portion, and at least a portion of the reinforcing portion being located between the body portion and the electrode terminal; The yield strength of the reinforcing part is greater than the yield strength of the body part.

8. The battery cell according to claim 7, characterized in that, The main body has a recess, and at least a portion of the reinforcing part is accommodated in the recess.

9. The battery cell according to claim 7, characterized in that, The reinforcing part includes multiple reinforcing sub-parts, which are spaced apart on the main body.

10. The battery cell according to claim 2, characterized in that, The reinforcing part includes a metallic material.

11. The battery cell according to claim 10, characterized in that, The metallic material includes at least one of stainless steel, aluminum, and copper.

12. The battery cell according to claim 1, characterized in that, The yield strength at each location of the isolation component is not less than 30 MPa.

13. The battery cell according to claim 12, characterized in that, The separator comprises a plastic material, which includes at least one of polyphenylene sulfide and liquid crystal polymer.

14. The battery cell according to claim 1, characterized in that, The isolation element has at least a partial structure with tensile strength Q2, which satisfies: Q2≥100MPa.

15. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 14.

16. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1 to 14, the battery cell being used to provide electrical energy.

Images