CN216903136U - Battery cells, batteries and electrical equipment - Google Patents

Abstract

The embodiment of the application provides a single battery, a battery and electric equipment, and belongs to the technical field of batteries. The battery cell includes a case, an electrode assembly, and an end cap. The electrode assembly is housed in the case. The end cover is used for covering the opening of the shell, the end cover comprises a first body part and a first protruding part, the first body part is arranged on the edge of the first protruding part in a surrounding mode, the first body part is used for being connected with the shell, the first protruding part protrudes relative to the first body part along the direction departing from the electrode assembly along the thickness direction of the end cover, a first accommodating space is formed inside the first protruding part, and the first accommodating space is used for accommodating at least one part of a pole lug of the electrode assembly. The first body part is provided with a reinforcing part which is used for enhancing the rigidity of the first body part. The reinforcing part enhances the deformation resistance of the first body part, reduces the risk of anode and cathode short circuit caused by large deformation of the first body part due to external force impact, and effectively improves the safety of the battery monomer.

Description

Battery cells, batteries and electrical equipment

technical field

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

Background technique

With the development of new energy technology, the application of batteries is becoming more and more extensive, such as mobile phones, notebook computers, battery cars, electric vehicles, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools.

In battery technology, both the performance of battery cells and the safety of battery cells need to be considered. Therefore, how to improve the safety of battery cells is an urgent problem to be solved in battery technology.

Utility model content

Embodiments of the present application provide a battery cell, a battery and an electrical device, which can effectively improve the safety of the battery cell.

In a first aspect, an embodiment of the present application provides a battery cell, the battery cell includes: a casing having an opening; an electrode assembly housed in the casing, the electrode assembly having tabs; and an end cover for the cover In conjunction with the opening, the end cap includes a first body portion and a first convex portion, the first body portion is surrounded by the edge of the first convex portion, and the first body portion is used for connecting with the first body portion. The casing is connected, and along the thickness direction of the end cap, the first convex portion protrudes in a direction away from the electrode assembly relative to the first body portion, and a first accommodating space is formed inside the first convex portion, The first accommodating space is used for accommodating at least a part of the tab; wherein, a reinforcement part is provided on the first body part, and the reinforcement part is used for enhancing the rigidity of the first body part.

In the above technical solution, the first body part of the end cover is provided with a reinforcing part, which improves the rigidity of the first body part, enhances the ability of the first body part to resist deformation, and reduces the occurrence of relatively high damage caused by the impact of external force on the first body part. Large deformation leads to the risk of short circuit of positive and negative electrodes, which effectively improves the safety of battery cells.

In some embodiments, along the thickness direction of the end cap, the first body portion has a second surface opposite to the first surface; the reinforcing portion is protruded from the first surface, and the first body portion A first concave portion is provided at a position corresponding to the reinforcing portion, and the first concave portion is recessed from the second surface in a direction from the second surface to the first surface.

In the above technical solution, the first concave portion is provided at the corresponding position of the first body portion and the reinforcing portion, which can effectively improve the rigidity of the first body portion. During molding, the first concave portion and the reinforcing portion may be formed by punching, that is, while the first concave portion is formed by punching on the second surface, the reinforcing portion protruding from the first surface is formed at the same time.

In some embodiments, the first recess portion extends beyond the first surface in a direction from the second surface to the first surface.

In the above technical solution, the first concave portion partially extends beyond the first surface, so that the first concave portion is partially recessed into the reinforcement portion, increasing the concave depth of the first concave portion, and the first concave portion can provide more deformation space for the reinforcement portion.

In some embodiments, the first surface is an inner surface of the first body portion facing the electrode assembly, and the second surface is an outer surface of the first body portion facing away from the electrode assembly.

In the above technical solution, the first surface is the inner surface of the first body portion, that is, the reinforcement portion is protruded from the inner surface of the first body portion, the reinforcement portion is located inside the battery cell, and the reinforcement portion does not occupy the outside of the battery cell. space and reduce the volume of the battery cell.

In some embodiments, the second surface is an inner surface of the first body portion facing the electrode assembly, and the first surface is an outer surface of the first body portion facing away from the electrode assembly.

In the above technical solution, the first surface is the outer surface of the first body portion, that is, the reinforcement portion is protruded from the outer surface of the first body portion, the reinforcement portion is located outside the battery cell, and the reinforcement portion does not occupy the outside of the battery cell. space, freeing up more space for electrode components, which is conducive to improving the energy density of battery cells. In addition, since the second surface is the inner surface of the first body part, so that the first concave part is recessed from the inner surface of the first body part in the direction from the inner surface of the first body part to the outer surface, the first concave part can provide the reinforcement part In the deformation space, even if the reinforcement part is greatly deformed inwardly by impact, it is not easy to damage the electrode assembly, which further reduces the risk of short circuit between positive and negative electrodes.

In some embodiments, the first protruding portion includes an end wall and a peripheral wall; along the thickness direction of the end cap, the end wall is farther from the electrode assembly than the first body portion; the peripheral wall surrounds It is arranged on the edge of the end wall and connected to the first body portion, and the peripheral wall and the end wall together define the first accommodating space.

In the above technical solution, the peripheral wall and the end wall jointly define the first accommodating space, and the end wall is farther from the electrode assembly than the first body portion. This structure increases the first accommodating space and can accommodate the tabs of the electrode assembly. More parts are beneficial to improve the energy density of the battery cell.

In some embodiments, the thickness of the first body portion is greater than the thickness of the end wall; and/or the thickness of the first body portion is greater than the thickness of the peripheral wall.

In the above technical solution, the thickness of the first body portion is greater than the thickness of the end wall, so that the first body portion has a stronger anti-deformation capability than the end wall and is less prone to deformation. Likewise, the thickness of the first body portion is greater than the thickness of the peripheral wall, so that the first body portion has stronger anti-deformation capability than the peripheral wall and is less prone to deformation.

In some embodiments, the battery cell further includes an electrode terminal, the electrode terminal is used for electrical connection with the tab, and the electrode terminal is disposed on the end wall.

In the above technical solution, the electrode terminals of the battery cells are arranged on the end walls, and the electrode terminals do not occupy the space of the first body part, which is beneficial to arranging the reinforcement part on the first body part and improving the rigidity of the first body part.

In some embodiments, the first body part includes two first edge parts and two second edge parts, and along the length direction of the end cap, the two first edge parts are located at the first edge parts, respectively On both sides of the protruding portion, along the width direction of the end cap, the two second edge portions are respectively located on both sides of the first protruding portion, and the size of the first edge portion in the length direction is larger than The dimension of the second edge portion in the width direction; wherein, at least one of the first edge portions is provided with the reinforcing portion.

In the above technical solution, the dimension of the first edge portion in the length direction of the end cap is larger than the dimension of the second edge portion in the width direction of the end cap, and the first edge portion is more easily deformed than the second edge portion. Therefore, a reinforcement portion is provided on at least one of the first edge portions to enhance the rigidity of the first edge portion.

In some embodiments, both of the first edge portions are provided with the reinforcing portion.

In the above technical solution, the two first edge parts are provided with reinforcing parts, which improves the rigidity of the two first edge parts, so that the parts of the end cover located on both sides of the first convex part in the length direction are not easily deformed.

In some embodiments, the reinforcement portion extends along the width direction.

In the above technical solution, the reinforcing portion extends along the width direction of the end cap, thereby increasing the span of the reinforcing portion in the width direction of the end cap, thereby increasing the rigidity of the first edge portion.

In some embodiments, the battery cell further includes an insulating member, and the insulating member is located on a side of the electrode assembly facing the end cap, so as to insulate and isolate the end cap from the electrode assembly.

In the above technical solution, by arranging an insulating member between the end cap and the electrode assembly, the insulation isolation of the end cap and the electrode assembly is realized, and the risk of short circuit between the positive and negative electrodes caused by the overlapping of the electrode assembly and the end cap is reduced.

In some embodiments, along the thickness direction of the end cap, a side of the insulating member facing the first body portion is provided with a second concave portion at a position corresponding to the reinforcing portion.

In the above technical solution, the second concave portion on the insulating member can provide a deformation space for the reinforcement portion to deform inside the battery cell, and reduce the possibility of extruding the insulating member due to the deformation of the reinforcement portion, so that the insulating member destroys the electrode assembly and causes a short circuit between the positive and negative electrodes. risk.

In some embodiments, the insulating member includes a second body portion and a second convex portion; the second body portion is surrounded by an edge of the second convex portion, and along the thickness direction of the end cap, the The second body portion is located on the side of the first body portion facing the electrode assembly, the second convex portion protrudes in a direction away from the electrode assembly relative to the second body portion, and the second convex portion at least partially It is accommodated in the first accommodating space, and a second accommodating space is formed inside the second convex portion, and the second accommodating space is used for accommodating at least a part of the tab; wherein, the second concave portion is provided in the the second body part, along the thickness direction of the end cap, the second body part has a third surface facing the first body part, the second concave part is close to the electrode from the third surface The orientation of the components is recessed.

In the above technical solution, the second convex portion of the insulating member is at least partially accommodated in the first accommodating space, reducing the overall size of the insulating member and the end cap in the thickness direction of the end cap, making the structure of the insulating member and the end cap more compact. . The inside of the second protrusion forms a second accommodating space, and at least a part of the tab is accommodated in the second accommodating space, reducing the space occupied by the tab inside the casing, providing more space for the main body of the electrode assembly, and facilitating lifting The energy density of the battery cell.

In a second aspect, an embodiment of the present application provides a battery, including: the battery cell provided by any one of the embodiments of the first aspect; and a case for accommodating the battery cell.

In a third aspect, an electrical device provided by an embodiment of the present application includes the battery provided by any one of the embodiments of the second aspect.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

2 is an exploded view of a battery provided by some embodiments of the present application;

3 is a schematic structural diagram of a battery cell provided by some embodiments of the present application;

FIG. 4 is a cross-sectional view of the battery cell shown in FIG. 3;

5 is a schematic structural diagram of an end cap provided by some embodiments of the present application;

Figure 6 is a cross-sectional view of the end cap shown in Figure 5;

7 is a schematic structural diagram of an end cap provided by other embodiments of the present application;

Figure 8 is a cross-sectional view of the end cap shown in Figure 7;

9 is an assembly diagram of an end cap and an electrode terminal provided by some embodiments of the present application;

10 is an assembly diagram of an end cap and an electrode terminal provided by other embodiments of the present application;

11 is an exploded view of the end cap and the insulating member provided by some embodiments of the application;

12 is an exploded view of the end cap and the insulating member provided by other embodiments of the present application;

13 is a flowchart of a method for manufacturing a battery cell provided by some embodiments of the present application;

FIG. 14 is a schematic block diagram of an apparatus for manufacturing a battery cell according to some embodiments of the present application.

Icon: 10-box body; 11-first part; 12-second part; 20-battery cell; 21-shell; 22-electrode assembly; 221-pole tab; 23-end cover; 231-first body part 2311-first surface; 2312-second surface; 2313-first edge part; 2314-second edge part; 232-first convex part; 2321-end wall; 2322-peripheral wall; 234-reinforcing part; 235-first recess; 2351-first bottom surface; 24-electrode terminal; 25-pressure relief mechanism; 26-insulator; 261-second recess; 262-second body part; 2621-third 263-second protrusion; 100-battery; 200-controller; 300-motor; 1000-vehicle; 2000-manufacturing equipment; 2100-first supply device; 2200-second supply device; 2300-third supply device; 2400-assembly device; X-length direction; Y-width direction; Z-thickness direction.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Some embodiments are claimed, but not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the specification of the application are only for describing specific implementations The purpose of this example is not to limit the application; the terms "comprising" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary and secondary relationship.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected" and "attached" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

The term "and/or" in this application is only an association relationship to describe associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, independently There are three cases of B. In addition, the character "/" in this application generally indicates that the related objects are an "or" relationship.

In the embodiments of the present 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 the embodiments of the present application shown in the accompanying drawings, as well as the overall thickness, length and width, etc. of the integrated device are only exemplary descriptions, and should not constitute any limitation to the present application. .

As used in this application, "plurality" refers to two or more (including two).

In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cell may be in the form of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which are not limited in the embodiments of the present application. The battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, which are not limited in the embodiments of the present application.

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. For example, the batteries mentioned in this application may include battery modules or battery packs, and the like. Batteries typically include a case for enclosing one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a separator. The battery cell mainly relies on the movement of metal ions between the positive pole piece and the negative pole piece to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The fluid, the positive electrode current collector without the positive electrode active material layer was used as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganate. The negative electrode pole piece includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode current collector without the negative electrode active material layer is protruded from the negative electrode collector that has been coated with the negative electrode active material layer. Fluid, the negative electrode current collector without the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), and the like. In addition, the electrode assembly may be a wound structure or a laminated structure, and the embodiment of the present application is not limited thereto.

For a battery cell, the battery cell generally includes a casing, an electrode assembly and an end cap. The electrode assembly is accommodated in the casing, and the end cap is closed to the opening of the casing. The end cap and the casing are jointly formed for accommodating the electrode assembly. and the sealed space of the electrode fluid.

In order to improve the energy density of the battery cells, the end caps are partially raised structures. The end cover includes a body portion and a convex portion. The body portion is connected to the casing so that the entire end cover is covered with the opening of the casing. The convex portion protrudes in a direction away from the electrode assembly relative to the body portion. An accommodating space is formed inside the convex portion to accommodate at least a part of the tab of the electrode assembly, so as to reduce the space occupied by the tab inside the battery cell and achieve the purpose of improving the energy density of the battery cell.

The inventors noticed that in such a battery cell, the body portion of the end cap is easily deformed when the end cap is impacted, especially when the battery cell is in an upside-down scenario, the body portion is greatly deformed and squeezes the electrode assembly, causing the electrode assembly. Component damage, such as damage to the separator of the electrode component, causes a short circuit of the negative electrode, and accidents such as battery cell explosion or fire are prone to occur, and there is a greater safety hazard.

In view of this, an embodiment of the present application provides a battery cell, in which a reinforcing portion is provided on the body portion of the end cover, and the rigidity of the body portion is enhanced by the reinforcing portion, the ability of the body portion to resist deformation is enhanced, and the external force impact on the body portion is reduced. Large deformation occurs, resulting in the risk of short circuit of positive and negative electrodes, which effectively improves the safety of battery cells.

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

Electrical equipment can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and power tools, and so on. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, spacecraft, etc.; electric toys include fixed Electric toys of type or mobile type, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembling electric tools and railway electric tools, such as, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical equipment.

In the following embodiments, for the convenience of description, the electric device is a vehicle as an example for description.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000 , and 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 an operating power source of the vehicle 1000 .

The vehicle 1000 may also include a controller 200 and a motor 300 for controlling the battery 100 to supply power to the motor 300 , eg, for starting, navigating, and running the vehicle 1000 for work power requirements.

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 can be used as the driving power source of the vehicle 1000 to provide driving power for the vehicle 1000 instead or partially instead of fuel or natural gas.

Please refer to FIG. 2 , which is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20 , and the case 10 is used to accommodate the battery cell 20 .

The box 10 is a component for accommodating the battery cells 20 , the box 10 provides accommodation space for the battery cells 20 , and the box 10 can adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12 , and the first part 11 and the second part 12 are covered with each other to define an accommodation space for accommodating the battery cells 20 . The first part 11 and the second part 12 may have various shapes, such as a rectangular parallelepiped, a cylinder, and the like. The first part 11 can be a hollow structure with one side open, and the second part 12 can also be a hollow structure with one side open. The open side of the second part 12 is covered with the open side of the first part 11 to form a box with an accommodating space body 10. Alternatively, the first part 11 can be a hollow structure with one side open, the second part 12 can be a plate-like structure, and the second part 12 is covered with the open side of the first part 11 to form the box 10 with an accommodating space. The first part 11 and the second part 12 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant or the like.

In the battery 100 , there may be one battery cell 20 or a plurality of battery cells 20 . If there are a plurality of battery cells 20, the plurality of battery cells 20 may be connected in series or in parallel or in a mixed connection. A mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. A plurality of battery cells 20 may be connected in series or in parallel or mixed to form a battery module, and then a plurality of battery modules may be connected in series or in parallel or mixed to form a whole, which is accommodated in the box 10 . It is also possible that all the battery cells 20 are directly connected in series, in parallel or in a mixed connection, and then the whole formed by all the battery cells 20 is accommodated in the box body 10 .

In some embodiments, the battery 100 may further include a bus component, and the plurality of battery cells 20 may be electrically connected through the bus component, so as to realize the series, parallel or mixed connection of the plurality of battery cells 20 . The bus members may be metal conductors such as copper, iron, aluminum, stainless steel, aluminum alloys, and the like.

Please refer to FIG. 3 , which is a schematic structural diagram of a battery cell 20 according to some embodiments of the present application. The battery cell 20 includes a casing 21 , an electrode assembly 22 (not shown in FIG. 3 ) and an end cap 23 .

The case 21 is a component for accommodating the electrode assembly 22 , the case 21 may be a hollow structure with an opening formed at one end, and the case 21 may be a hollow structure with an opening formed at the opposite ends. The housing 21 can be in various shapes, such as a cylinder, a rectangular parallelepiped, and the like. The housing 21 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, and the like.

The electrode assembly 22 is the part in which the electrochemical reaction occurs in the battery cell 20 . The electrode assembly 22 has a tab 221 (not shown in FIG. 3 ), and the tab 221 is divided into a positive tab and a negative tab. Opposite sides of the electrode assembly 22 .

The end cap 23 is a component that covers the opening of the casing 21 to isolate the internal environment of the battery cell 20 from the external environment. The end cap 23 and the casing 21 together define a sealed space for accommodating the electrode assembly 22, the electrolyte and other components. The shape of the end cover 23 may match the shape of the casing 21 , for example, the casing 21 is a rectangular parallelepiped structure, the end cover 23 is a rectangular plate-shaped structure matching the casing 21 , and for example, the casing 21 is a cylindrical structure , the end cover 23 is a circular plate-shaped structure matched with the casing 21 . The material of the end cap 23 can also be various, for example, copper, iron, aluminum, steel, aluminum alloy, and the like.

In the battery cell 20, the number of end caps 23 may be one or two. If the casing 21 is a hollow structure with an opening formed at one end, one end cap 23 is provided correspondingly. If the casing 21 is a hollow structure with openings formed at both ends, two end caps 23 are provided correspondingly, and the two end caps 23 cover the two openings of the casing 21 respectively.

Electrode terminals 24 may be provided on the end caps 23 , and the electrode terminals 24 are used for electrical connection with the tabs 221 to output the electrical energy of the battery cells 20 . The electrode terminal 24 may include a positive electrode terminal for electrical connection with the positive tab and a negative electrode terminal for electrical connection with the negative tab. The positive electrode terminal and the negative electrode terminal may be arranged on the same end cap 23 or may be arranged on different end caps 23 . For example, the casing 21 is a hollow structure with openings formed at both ends, the battery cell 20 has two end caps 23, the two end caps 23 cover the two openings of the casing 21 correspondingly, and the negative electrode terminal is arranged on one end cap 23. In the end cap 23 , the positive electrode terminal is arranged on the other end cap 23 . For another example, as shown in FIG. 3 , the casing 21 is a hollow structure with an opening formed at one end, the battery cell 20 has one end cap 23 , and the negative electrode terminal and the positive electrode terminal can be arranged on the same end cap 23 .

The positive electrode terminal and the positive tab can be directly or indirectly connected, and the negative electrode terminal and the negative tab can be directly or indirectly connected. Exemplarily, the positive electrode terminal is indirectly connected to the positive electrode tab through one current collecting member, and the negative electrode terminal is indirectly connected to the negative electrode tab through another current collecting member.

A pressure relief mechanism 25 may also be provided on the end cover 23 , and the pressure relief mechanism 25 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The pressure relief mechanism 25 may be an explosion-proof valve, an explosion-proof disc, a safety valve and other components.

Please continue to refer to FIG. 4 . FIG. 4 is a cross-sectional view of the battery cell 20 shown in FIG. 3 . An embodiment of the present application provides a battery cell 20 . The battery cell 20 includes a casing 21 , an electrode assembly 22 and an end cap 23 . The housing 21 has an opening. The electrode assembly 22 is accommodated in the casing 21 , and the electrode assembly 22 has tabs 221 . The end cover 23 is used to cover the opening. The end cover 23 includes a first body portion 231 and a first convex portion 232. The first body portion 231 is surrounded by the edge of the first convex portion 232. The first body portion 231 is used for connecting with the first body portion 231. The casing 21 is connected, and along the thickness direction Z of the end cap 23, the first convex portion 232 protrudes in a direction away from the electrode assembly 22 relative to the first body portion 231, and a first accommodating space 233 is formed inside the first convex portion 232. The accommodating space 233 is used for accommodating at least a part of the tab 221 . The first body portion 231 is provided with a reinforcement portion 234 , and the reinforcement portion 234 is used to enhance the rigidity of the first body portion 231 .

The first body part 231 is the part of the end cover 23 surrounded by the first convex part 232 and connected to the casing 21 . The first body part 231 can be welded with the casing 21 , and the welding track can be along the opening of the casing 21 . Circumferential extension. The first body portion 231 may have various structures, such as a rectangular structure, a circular structure, and the like.

The first protruding portion 232 may also have various structures, such as a rectangular structure, a circular structure, and the like. If the first body portion 231 has a rectangular structure, the first protruding portion 232 can be set to a rectangular structure, and the end cap 23 of this structure can be applied to a rectangular battery cell. If the second body portion 262 has a circular structure, the first protruding portion 232 can be set to a circular structure, and the end cap 23 of this structure can be suitable for cylindrical battery cells. In the embodiment in which the electrode terminal 24 is provided on the end cap 23 , the electrode terminal 24 may be provided on the first body portion 231 or may be provided on the first convex portion 232 .

A first accommodating space 233 is formed inside the first protruding portion 232 . The first accommodating space 233 forms a first opening on the side of the first body portion 231 facing the electrode assembly 22 , and the tab 221 of the electrode assembly 22 can enter through the first opening. into the first accommodating space 233 .

The tab 221 may be the positive tab of the electrode assembly 22 or the negative tab. In the embodiment in which the positive electrode tab and the negative electrode tab are formed at the same end of the electrode assembly 22 , both the positive electrode tab and the negative electrode tab may be accommodated at least partially in the first accommodating space 233 . In the embodiment in which the positive electrode tab and the negative electrode tab are respectively formed at opposite ends of the electrode assembly 22, at least a part of the positive electrode tab can be accommodated in the first accommodating space 233, or at least a part of the negative electrode tab can be accommodated in the first accommodating space 233. in the first accommodating space 233 .

The reinforcement portion 234 is a structure disposed on the first body portion 231 to enhance the strength of the first body portion 231 , and the reinforcement portion 234 may have various structures. For another example, the reinforcement portion 234 is a cavity disposed inside the first body portion 231 . The reinforcement portion 234 can also be in various shapes, such as rectangular, circular, annular, and the like.

In the embodiment of the present application, the first body portion 231 of the end cover 23 is provided with a reinforcing portion 234, which improves the rigidity of the first body portion 231, enhances the ability of the first body portion 231 to resist deformation, and reduces the The portion 231 is greatly deformed by the impact of the external force, resulting in the risk of short circuit of the positive and negative electrodes, which effectively improves the safety of the battery cell 20 .

In some embodiments, please refer to FIGS. 5-8 , FIG. 5 is a schematic structural diagram of the end cap 23 provided by some embodiments of the present application, FIG. 6 is a cross-sectional view of the end cap 23 shown in FIG. 5 , and FIG. 7 is the present application Other embodiments provide a schematic structural diagram of the end cap 23 , and FIG. 8 is a cross-sectional view of the end cap 23 shown in FIG. 7 . The first body portion 231 has a second surface 2312 opposite to the first surface 2311 along the thickness direction Z of the end cap 23 . The reinforcing portion 234 is protruded from the first surface 2311 , the first body portion 231 is provided with a first concave portion 235 at a position corresponding to the reinforcing portion 234 , and the first concave portion 235 is directed from the second surface 2312 to the first surface 2311 along the second surface 2312 direction depression.

The first surface 2311 may be the outer surface of the first body portion 231, and the second surface 2312 may be the inner surface of the first body portion 231; or the first surface 2311 may be the inner surface of the first body portion 231, and the second surface 2312 is the outer surface of the first body portion 231 . If the first surface 2311 is the outer surface of the first body portion 231 , the second surface 2312 is the inner surface of the first body portion 231 , and the second surface 2312 points in the direction of the first surface 2311 , that is, the first body portion 231 faces away from the electrode The orientation of the assembly 22 (shown in FIG. 4 ); if the second surface 2312 is the outer surface of the first body portion 231 , the first surface 2311 is the inner surface of the first body portion 231 , and the second surface 2312 points to the first surface 2311 The direction is the direction in which the first body portion 231 faces the electrode assembly 22 .

The shape of the first concave portion 235 may match the shape of the first convex portion 232 .

In this embodiment, the first concave portion 235 is provided at the corresponding position of the first body portion 231 and the reinforcing portion 234 , which can effectively improve the rigidity of the first body portion 231 . During molding, the first concave portion 235 and the reinforcing portion 234 may be formed by punching, that is, while the first concave portion 235 is formed by punching on the second surface 2312, the reinforcing portion 234 protruding from the first surface 2311 is formed at the same time. Simple.

In some embodiments, the first recess 235 partially protrudes beyond the first surface 2311 in a direction from the second surface 2312 to the first surface 2311 .

It can be understood that a portion of the first concave portion 235 extends into the reinforcement portion 234 . The first concave portion 235 has a first bottom surface 2351 , and the first bottom surface 2351 is the surface at the deepest position of the first concave portion 235 . A portion of the first recess 235 extends beyond the first surface 2311 along the direction of the second surface 2312 toward the first surface 2311 , that is, the first bottom surface 2351 is further away from the second surface 2312 than the first surface 2311 . Exemplarily, the first bottom surface 2351 is a plane perpendicular to the thickness direction Z of the end cap 23 .

In this embodiment, the first concave portion 235 partially protrudes beyond the first surface 2311 , so that the first concave portion 235 is partially recessed into the reinforcement portion 234 , thereby increasing the recessed depth of the first concave portion 235 , and the first concave portion 235 can provide the reinforcement portion 234 More room for deformation.

In some embodiments, referring to FIG. 6 , the first surface 2311 is the inner surface of the first body portion 231 facing the electrode assembly 22 (shown in FIG. 4 ), and the second surface 2312 is the first body portion 231 facing away from the electrode assembly 22 . the outer surface.

The inner surface and the outer surface of the first body portion 231 are disposed opposite to each other in the thickness direction Z of the end cover 23 , and both the inner surface and the outer surface of the first body portion 231 may be flat. Taking the first body portion 231 as a flat plate structure as an example, the thickness of the first body portion 231 is the distance between the inner surface and the outer surface of the first body portion 231 .

In this embodiment, the first surface 2311 is the inner surface of the first body portion 231 , that is, the reinforcement portion 234 is protruded from the inner surface of the first body portion 231 , the reinforcement portion 234 is located inside the battery cell 20 , and the reinforcement portion 234 The external space of the battery cell 20 is not occupied, and the volume of the battery cell 20 is reduced.

In some embodiments, referring to FIG. 8 , the second surface 2312 is the inner surface of the first body portion 231 facing the electrode assembly 22 (shown in FIG. 4 ), and the first surface 2311 is the first body portion 231 facing away from the electrode assembly 22 the outer surface.

In this embodiment, the first surface 2311 is the outer surface of the first body portion 231 , that is, the reinforcement portion 234 is protruded from the outer surface of the first body portion 231 , the reinforcement portion 234 is located outside the battery cell 20 , and the reinforcement portion 234 It does not occupy the external space of the battery cell 20 , frees up more space for the electrode assembly 22 , and is beneficial to improve the energy density of the battery cell 20 . In addition, since the second surface 2312 is the inner surface of the first body portion 231 , the first concave portion 235 is concave from the inner surface of the first body portion 231 along the direction from the inner surface of the first body portion 231 to the outer surface. The 235 can provide a deformation space for the reinforcement portion 234, and even if the reinforcement portion 234 is greatly deformed inwardly due to an impact, the electrode assembly 22 is not easily damaged, further reducing the risk of short circuit between the positive and negative electrodes.

In some embodiments, please refer to FIGS. 5-8 , the first protruding portion 232 includes an end wall 2321 and a peripheral wall 2322 . Along the thickness direction Z of the end cap 23 , the end wall 2321 is further away from the electrode assembly 22 (shown in FIG. 4 ) than the first body portion 231 . The peripheral wall 2322 is disposed around the edge of the end wall 2321 , the peripheral wall 2322 is connected to the first body portion 231 , and the peripheral wall 2322 and the end wall 2321 together define a first accommodating space 233 .

The end wall 2321 and the peripheral wall 2322 together form the first convex portion 232 , and the first body portion 231 , the peripheral wall 2322 and the end wall 2321 may be integrally formed. The shape of the end wall 2321 and the peripheral wall 2322 can be various, for example, a circular structure, a rectangular structure, and the like. If the end wall 2321 and the peripheral wall 2322 are both circular structures, the first convex portion 232 and the first accommodating space 233 are both circular structures. The first accommodating spaces 233 are all rectangular structures. The thicknesses of the first body portion 231 , the peripheral wall 2322 and the end wall 2321 may be equal or different.

In this embodiment, the peripheral wall 2322 and the end wall 2321 together define the first accommodating space 233 , and the end wall 2321 is further away from the electrode assembly 22 than the first body portion 231 . This structure increases the first accommodating space 233 . More parts of the tabs 221 of the electrode assembly 22 can be accommodated, which is beneficial to improve the energy density of the battery cells 20 .

In some embodiments, the thickness of the first body portion 231 is greater than the thickness of the end wall 2321 ; and/or the thickness of the first body portion 231 is greater than the thickness of the peripheral wall 2322 .

It can be understood that in the embodiment in which the thickness of the first body is greater than the thickness of the end wall 2321 , the thickness of the first body portion 231 may be less than, equal to or greater than the thickness of the peripheral wall 2322 . In the embodiment in which the thickness of the first body is greater than that of the peripheral wall 2322 , the thickness of the first body portion 231 may be less than, equal to or greater than the thickness of the end wall 2321 .

Exemplarily, the thickness of the end wall 2321 is equal to the thickness of the peripheral wall 2322 , and both the thickness of the end wall 2321 and the thickness of the peripheral wall 2322 are smaller than the thickness of the first body portion 231 .

Since the thickness of the first body portion 231 is greater than the thickness of the end wall 2321 , the first body portion 231 has a stronger anti-deformation capability than the end wall 2321 and is less prone to deformation. Likewise, since the thickness of the first body portion 231 is greater than the thickness of the peripheral wall 2322 , the first body portion 231 has a stronger anti-deformation capability than the peripheral wall 2322 and is less prone to deformation.

In some embodiments, please continue to refer to FIGS. 9 and 10 , FIG. 9 is an assembly diagram of the end cap 23 and the electrode terminal 24 provided by some embodiments of the present application, and FIG. 10 is the end cap 23 provided by some other embodiments of the present application. Assembly drawing with electrode terminal 24 . The battery cell 20 further includes an electrode terminal 24 for electrical connection with the tab 221 (shown in FIG. 4 ), and the electrode terminal 24 is provided on the end wall 2321 .

Understandably, the electrode terminal 24 is located on the first convex portion 232 . The number of electrode terminals 24 in the battery cell 20 may be one or two.

Taking two electrode terminals 24 in the battery cell 20 as an example, the two electrode terminals 24 are both mounted on the end wall 2321 . The two electrode terminals 24 are a positive electrode terminal and a negative electrode terminal, respectively, which are electrically connected to the positive and negative tabs of the electrode assembly 22 (shown in FIG. 4 ), respectively. Taking the first body portion 231 of the end cap 23 as a rectangle as an example, the two electrode terminals 24 may be arranged at intervals along the length direction X of the end cap 23 .

In this embodiment, the electrode terminals 24 of the battery cells 20 are arranged on the end walls 2321, and the electrode terminals 24 do not occupy the space of the first body portion 231, which is beneficial to arranging the reinforcement portion 234 on the first body portion 231 and improving the first body portion 231. The stiffness of a body portion 231 .

In some embodiments, please continue to refer to FIGS. 9 and 10 , the first body portion 231 includes two first edge portions 2313 and two second edge portions 2314 , along the length direction X of the end cap 23 , the two first The edge parts 2313 are located on both sides of the first convex part 232 respectively, along the width direction Y of the end cap 23 , the two second edge parts 2314 are respectively located on both sides of the first convex part 232 , the first edge part 2313 is in the length direction X The size of the upper portion is larger than the size of the second edge portion 2314 in the width direction Y. Wherein, at least one first edge portion 2313 is provided with a reinforcing portion 234 .

The first edge portion 2313 and the second edge portion 2314 are the portions of the first body portion 231 located on the edge of the first convex portion 232 , and the two first edge portions 2313 and the two second edges are located on the first convex portion 232 respectively. A first edge portion 2313 , a second edge portion 2314 , another first edge portion 2313 and another second edge portion 2314 are connected end to end in sequence to form a closed-loop structure. The two first edge portions 2313 are oppositely arranged in the length direction X of the end cover 23 , and the two second edges are oppositely arranged in the width direction Y of the end cover 23 , so that the first body portion 231 has a rectangular structure as a whole.

It should be noted that, at least one first edge portion 2313 is provided with a reinforcing portion 234, and only one first edge portion 2313 may be provided with a reinforcing portion 234, or both first edges may be provided with a reinforcing portion 234. The number of reinforcing parts 234 on the first edge part 2313 may be one or multiple. Of course, at least one first edge portion 2313 is provided with the reinforcing portion 234, which does not mean that the second edge portion 2314 cannot be provided with the reinforcing portion 234. In the case where at least one first edge portion 2313 is provided with the reinforcing portion 234, the second The reinforcing portion 234 may be provided on the edge portion 2314, or the reinforcing portion 234 may not be provided.

Taking the reinforcing portion 234 on the first reinforcing portion 234 as an example of a rectangular protrusion, the first reinforcing portion 234 may extend in multiple directions. For example, the first reinforcement portion 234 extends along the length direction X of the end cap 23 , and for another example, the first reinforcement portion 234 extends along the width direction Y of the end cap 23 .

In the present embodiment, the dimension of the first edge portion 2313 in the length direction X of the end cap 23 is larger than the dimension of the second edge portion 2314 in the width direction Y of the end cap 23 . The edge portion 2314 is more easily deformed. Therefore, a reinforcement portion 234 is provided on at least one of the first edge portions 2313 to enhance the rigidity of the first edge portion 2313 .

In some embodiments, both first edge portions 2313 are provided with reinforcement portions 234 . Further, the rigidity of the two first edge portions 2313 is improved, so that the portions of the end cap 23 located on both sides of the first convex portion 232 in the length direction X of the end cap 23 are not easily deformed.

In some embodiments, the reinforcement portion 234 extends in the width direction Y. As shown in FIG.

Exemplarily, the reinforcing portion 234 is a rectangular protrusion protruding from the first body portion 231 . In FIG. 9 , the reinforcing portion 234 is a rectangular protrusion protruding from the inner surface of the first body portion 231 . In FIG. 10 , the reinforcing portion 234 is a rectangular protrusion protruding from the outer surface of the first body portion 231 .

In this embodiment, the reinforcement portion 234 extends along the width direction Y of the end cover 23 , which increases the span of the reinforcement portion 234 in the width direction Y of the end cover 23 , thereby improving the rigidity of the first edge portion 2313 .

In some embodiments, please refer to FIGS. 11 and 12 , FIG. 11 is an exploded view of the end cap 23 and the insulating member 26 provided by some embodiments of the present application, and FIG. 12 is the end cap 23 and the end cap 23 provided by some other embodiments of the present application. An exploded view of the insulating member 26, the battery cell 20 further includes the insulating member 26, and the insulating member 26 is located on the side of the electrode assembly 22 (shown in FIG. 4 ) facing the end cap 23 to insulate and isolate the end cap 23 from the electrode assembly 22 .

The insulating member 26 serves to separate the end cap 23 and the electrode assembly 22, and the insulating member 26 is made of insulating material, such as rubber, plastic and the like.

By arranging the insulating member 26 between the end cap 23 and the electrode assembly 22, the insulation isolation of the end cap 23 and the electrode assembly 22 is realized, and the risk of short circuit between the positive and negative electrodes caused by the overlapping of the electrode assembly 22 and the end cap 23 is reduced.

In some embodiments, along the thickness direction Z of the end cap 23 , the side of the insulating member 26 facing the first body portion 231 is provided with a second concave portion 261 at a position corresponding to the reinforcing portion 234 .

The shape of the second recess 261 may match the shape of the first recess 235 . Referring to FIG. 11 , in the embodiment in which the reinforcing portion 234 is protruded from the inner surface of the first body portion 231 (not shown in FIG. 11 ), the reinforcing portion 234 may be at least partially accommodated in the first concave portion 235 , and the reinforcing portion 234 There is a distance from the bottom surface of the second concave portion 261 to provide a space for the reinforcement portion 234 to deform into the battery cell 20 . Referring to FIG. 12 , in the embodiment in which the reinforcing portion 234 is protruded from the outer surface of the first body portion 231 , the reinforcing portion 234 is not located in the second concave portion 261 . When the reinforcing portion 234 is impacted to the inside of the battery cell 20 When deformed, the deformed reinforcing portion 234 can be accommodated in the second concave portion 261 .

In this embodiment, the second concave portion 261 on the insulating member 26 can provide a deformation space for the reinforcing portion 234 to deform inside the battery cell 20 , thereby reducing the extrusion of the insulating member 26 due to the deformation of the reinforcing portion 234 , so that the insulating member 26 destroys the electrode components 22, resulting in the risk of short circuit between the positive and negative poles.

In some embodiments, please continue to refer to FIGS. 11 and 12 , the insulating member 26 includes a second body portion 262 and a second protruding portion 263 . The second body portion 262 is surrounded by the edge of the second protruding portion 263. Along the thickness direction Z of the end cap 23, the second body portion 262 is located on the side of the first body portion 231 facing the electrode assembly 22 (shown in FIG. 4 ). The second protruding portion 263 protrudes in a direction away from the electrode assembly 22 relative to the second body portion 262 , the second protruding portion 263 is at least partially accommodated in the first accommodating space 233 , and a second accommodating space is formed inside the second protruding portion 263 , The second accommodating space is used for accommodating at least a part of the tab 221 .

The second concave portion 261 is disposed in the second body portion 262 , and along the thickness direction Z of the end cap 23 , the second body portion 262 has a third surface 2621 facing the first body portion 231 , and the second concave portion 261 extends from the third surface 2621 It is recessed in a direction close to the electrode assembly 22 .

The second body portion 262 is a portion of the insulating member 26 surrounding the second protruding portion 263 , and the second body portion 262 serves to separate the first body portion 231 and the electrode assembly 22 . The shape of the second body part 262 may match the shape of the first body part 231 .

The second protrusions 263 may match the shape of the first protrusions 232 . At least part of the second convex portion 263 is accommodated in the first accommodating space 233 , and the second convex portion 263 functions to separate the first convex portion 232 and the electrode assembly 22 .

A second accommodating space is formed inside the second protruding portion 263 , and the second accommodating space forms a second opening on the side of the second body portion 262 facing the electrode assembly 22 , and the tab 221 of the electrode assembly 22 can enter into the second accommodating space through the second opening. 2. In the accommodation space.

In this embodiment, the second protruding portion 263 of the insulating member 26 is at least partially accommodated in the first accommodating space 233, reducing the overall size of the insulating member 26 and the end cover 23 in the thickness direction Z of the end cover 23, so that the insulating member 26 and end cap 23 are more compact in structure. The inside of the second protrusion 263 forms a second accommodating space, and at least a part of the tab 221 is accommodated in the second accommodating space, reducing the space occupied by the tab 221 inside the housing 21 and providing more space for the main body of the electrode assembly 22 The space is beneficial to improve the energy density of the battery cell 20 .

An embodiment of the present application provides a battery 100 , which includes a box body 10 and the battery cells 20 provided in any of the above embodiments, and the box body 10 is used for accommodating the battery cells 20 .

An electrical device provided by an embodiment of the present application includes the battery 100 provided by any one of the foregoing embodiments.

The powered device may be any of the above-mentioned devices using the battery 100 .

In addition, please refer to FIG. 3 and FIG. 4 , an embodiment of the present application provides a prismatic battery cell, which includes a casing 21 , an electrode assembly 22 , an end cap 23 and an insulating member 26 , and the electrode assembly 22 is accommodated in the casing 21 , One end of the casing 21 forms an opening, the end cap 23 covers the opening of the casing 21 , and the insulating member 26 is used to separate the end cap 23 and the electrode assembly 22 . The end cover 23 has a rectangular structure. The end cover 23 includes a first body portion 231 and a first convex portion 232 . The first body portion 231 is surrounded by the edge of the first convex portion 232 . The first body portion 231 is used for connecting with the housing 21 . Welding, along the thickness direction Z of the end cap 23 , the first protruding portion 232 protrudes in a direction away from the electrode assembly 22 relative to the first body portion 231 , and a first accommodating space 233 is formed inside the first protruding portion 232 . The first accommodating space 233 Used to accommodate a part of the tab 221 . A reinforcing portion 234 is provided on the outer surface of the first body portion 231 , a first concave portion 235 is provided at a position corresponding to the reinforcing portion 234 of the first body portion 231 , and the second concave portion 261 faces away from the electrode from the inner surface of the first body portion 231 . The orientation of the assembly 22 is concave.

In the battery cell 20 in such an orientation, the first body portion 231 is provided with a reinforcing portion 234, which improves the rigidity of the first body portion 231, enhances the ability of the first body portion 231 to resist deformation, and reduces the damage caused by the first body portion 231. The 231 is greatly deformed by the impact of external force, resulting in the risk of short circuit of the positive and negative electrodes, which effectively improves the safety of the battery cell 20 . Since the reinforcement portion 234 is disposed on the outer surface of the first body portion 231 , the reinforcement portion 234 does not occupy the internal space of the battery cell 20 , freeing up more space for the electrode assembly 22 , which is beneficial to increase the energy of the battery cell 20 density. In addition, the first concave portion 235 can provide a deformation space for the reinforcing portion 234, so even if the reinforcing portion 234 is greatly deformed inwardly due to an impact, the electrode assembly 22 is not easily damaged, further reducing the risk of short circuit between the positive and negative electrodes.

Please refer to FIG. 13 . FIG. 13 is a flowchart of a method for manufacturing a battery cell 20 provided by some embodiments of the present application. An embodiment of the present application provides a method for manufacturing a battery cell 20 . The manufacturing method includes:

S100: providing a casing 21, and the casing 21 has an opening;

S200: Provide an electrode assembly 22, and the electrode assembly 22 has tabs 221;

S300: Provide end cap 23;

S400: accommodating the electrode assembly 22 in the casing 21;

S500 : Cover the end cap 23 with the opening of the casing 21 .

The end cover 23 includes a first body portion 231 and a first convex portion 232, the first body portion 231 is surrounded by the edge of the first convex portion 232, and the first body portion 231 is used for connecting with the housing 21 along the end cover. In the thickness direction Z of 23, the first protruding portion 232 protrudes relative to the first body portion 231 in a direction away from the electrode assembly 22, and a first accommodating space 233 is formed inside the first protruding portion 232, and the first accommodating space 233 is used for accommodating the tabs At least a part of the first body part 231 is provided with a reinforcement part 234 , and the reinforcement part 234 is used to enhance the rigidity of the first body part 231 .

In the above method, step S100, step S200 and step S300 are not limited. For example, step S300 may be performed first, then step S200, and then step S100.

It should be noted that, for the related structure of the battery cell 20 manufactured by the manufacturing method provided in the foregoing embodiment, reference may be made to the battery cell 20 provided in the foregoing embodiment, and details are not described herein again.

Please refer to FIG. 14. FIG. 14 is a schematic block diagram of a manufacturing apparatus 2000 of a battery cell 20 provided by some embodiments of the present application. An embodiment of the present application provides a manufacturing apparatus 2000 of a battery cell 20. The manufacturing apparatus 2000 includes a first A providing device 2100 , a second providing device 2200 , a third providing device 2300 and an assembling device 2400 are provided.

The first providing device 2100 is used to provide the housing 21, and the housing 21 has an opening. The second providing device 2200 is used to provide the electrode assembly 22 , and the electrode assembly 22 has tabs 221 . The third providing device 2300 is used to provide the end cap 23 . The assembling device 2400 is used for accommodating the electrode assembly 22 in the casing 21, and the assembling device 2400 is also used for covering the end cap 23 on the opening.

The end cover 23 includes a first body portion 231 and a first convex portion 232, the first body portion 231 is surrounded by the edge of the first convex portion 232, and the first body portion 231 is used for connecting with the housing 21 along the end cover. In the thickness direction Z of 23, the first protruding portion 232 protrudes relative to the first body portion 231 in a direction away from the electrode assembly 22, and a first accommodating space 233 is formed inside the first protruding portion 232, and the first accommodating space 233 is used for accommodating the tabs At least a part of the first body part 231 is provided with a reinforcement part 234 , and the reinforcement part 234 is used to enhance the rigidity of the first body part 231 .

It should be noted that, for the related structure of the battery cell 20 manufactured by the manufacturing apparatus 2000 provided in the foregoing embodiment, reference may be made to the battery cell 20 provided in the foregoing embodiment, and details are not repeated here.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict.

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, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (16)

1. A battery cell, comprising:

a housing having an opening;

an electrode assembly received in the case, the electrode assembly having tabs;

an end cap, configured to cover the opening, where the end cap includes a first body portion and a first protrusion, where the first body portion is surrounded by an edge of the first protrusion, the first body portion is configured to be connected to the case, and along a thickness direction of the end cap, the first protrusion protrudes in a direction away from the electrode assembly relative to the first body portion, and a first receiving space is formed inside the first protrusion and is configured to receive at least a portion of the tab;

the first body part is provided with a reinforcing part, and the reinforcing part is used for enhancing the rigidity of the first body part.

2. The battery cell as recited in claim 1, wherein the first body portion has a second surface of the opposing first surfaces in a thickness direction of the end cap;

the reinforcing part is arranged on the first surface in a protruding mode, a first concave part is arranged at the position, corresponding to the reinforcing part, of the first body part, and the first concave part is sunken from the second surface along the direction from the second surface to the first surface.

3. The battery cell according to claim 2, wherein the first recessed portion protrudes beyond the first surface in a direction in which the second surface is directed toward the first surface.

4. The battery cell as recited in claim 2 wherein the first surface is an inner surface of the first body portion facing the electrode assembly and the second surface is an outer surface of the first body portion facing away from the electrode assembly.

5. The battery cell as recited in claim 2 wherein the second surface is an inner surface of the first body portion facing the electrode assembly and the first surface is an outer surface of the first body portion facing away from the electrode assembly.

6. The battery cell as recited in claim 1, wherein the first protrusion includes an end wall and a peripheral wall;

the end wall is farther from the electrode assembly than the first body portion in a thickness direction of the end cap;

the peripheral wall surrounds the edge of the end wall and is connected to the first body part, and the peripheral wall and the end wall jointly define the first accommodating space.

7. The battery cell as recited in claim 6 wherein the first body portion has a thickness greater than a thickness of the end wall; and/or the thickness of the first body part is larger than that of the peripheral wall.

8. The battery cell as recited in claim 6 further comprising an electrode terminal for electrical connection with the tab, the electrode terminal being disposed on the end wall.

9. The battery cell according to any one of claims 1 to 8, wherein the first body portion includes two first edge portions and two second edge portions, the two first edge portions are located on both sides of the first protrusion in a length direction of the end cap, the two second edge portions are located on both sides of the first protrusion in a width direction of the end cap, and a dimension of the first edge portion in the length direction is larger than a dimension of the second edge portion in the width direction;

wherein at least one of the first edge portions is provided with the reinforcement portion.

10. The battery cell as recited in claim 9 wherein both of the first edge portions are provided with the reinforcement portion.

11. The battery cell as recited in claim 9 wherein the reinforcement extends in the width direction.

12. The battery cell of any of claims 1-8, further comprising an insulator on a side of the electrode assembly facing the end cap to insulate the end cap from the electrode assembly.

13. The battery cell according to claim 12, wherein a second recess is provided at a position corresponding to the reinforcing portion on a side of the insulating member facing the first body portion in a thickness direction of the end cap.

14. The battery cell as recited in claim 13 wherein the insulator comprises a second body portion and a second protrusion;

the second body part is arranged around the edge of the second protrusion part, the second body part is positioned on one side of the first body part facing the electrode assembly along the thickness direction of the end cover, the second protrusion part protrudes relative to the second body part along the direction departing from the electrode assembly, the second protrusion part is at least partially accommodated in the first accommodating space, a second accommodating space is formed inside the second protrusion part, and the second accommodating space is used for accommodating at least one part of the tab;

wherein the second recess is provided in the second body portion, the second body portion having a third surface facing the first body portion in a thickness direction of the end cap, the second recess being recessed from the third surface in a direction close to the electrode assembly.

15. A battery, comprising:

a battery cell according to any one of claims 1 to 14;

and the box body is used for accommodating the battery monomer.

16. An electrical device comprising the battery of claim 15.

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