CN215496872U - Battery monomer, battery and consumer - 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 an electrode assembly, a case, and an end cap. The electrode assembly comprises a main body part and a first tab, wherein the first tab is convexly arranged at one end of the main body part. The case has an opening and a first stopper, and the case accommodates the electrode assembly. The end cover comprises a cover body, the cover body is used for covering the opening, the cover body is positioned on one side of the first limiting part, which deviates from the electrode assembly, and the first limiting part is used for limiting the cover body to move along the direction facing the main body part relative to the shell. The end cover further comprises a first convex part protruding from the inner surface of the cover body along the direction facing the main body part, the first convex part is configured to exceed the first limiting part along the direction departing from the cover body, so that the first convex part is pressed against the first lug, good contact between the first convex part and the first lug is guaranteed, the risk that the first lug cannot be in contact with the end cover due to the fact that the first lug is limited by the first limiting part is reduced, and the performance of the battery is guaranteed.

Description

Battery monomer, battery and consumer

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like.

The battery cell generally includes a case, an electrode assembly accommodated in the case, and an end cap covering an opening at one end of the case, the end cap being electrically connected to the tab, the end cap serving as an output electrode of the battery cell. For a general battery cell, due to structural limitation of the housing, the situation that the end cover and the tab cannot be contacted or are in poor contact may occur, and normal use of the battery cell is affected.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a single battery, a battery and electric equipment, and can ensure that an end cover in the single battery is in good contact with a lug.

In a first aspect, an embodiment of the present application provides a battery cell, including: the electrode assembly comprises a main body part and a first tab, wherein the first tab is convexly arranged at one end of the main body part; a case having an opening and a first stopper, the case accommodating the electrode assembly; the end cover comprises a cover body, the cover body is used for covering the opening, the cover body is positioned on one side, away from the electrode assembly, of the first limiting part in the thickness direction of the end cover, and the first limiting part is used for limiting the cover body to move relative to the shell along the direction facing the main body part; the end cover further comprises a first convex part protruding from the inner surface of the cover body in the direction facing the main body part, and the first convex part is configured to exceed the first limiting part in the direction away from the cover body, so that the first convex part is pressed against the first tab.

Among the above-mentioned technical scheme, the first convex part of end cover surpasss first spacing portion along the direction that deviates from the lid body for the protrusion is supported and is pressed in first utmost point ear, guarantees the good contact of first convex part and first utmost point ear, improves the area of overflowing of first utmost point ear and end cover, reduces because of first utmost point ear receives the first spacing portion's of casing the restriction and can't guarantee the battery performance with the risk of end cover contact.

In some embodiments, in the thickness direction, the first protruding portion has an abutting plane that abuts against the first tab, and the abutting plane is entirely closer to the main body portion than the first stopper portion.

Among the above-mentioned technical scheme, the support of first convex part leans on the plane and offsets with first utmost point ear, has increased the area of contact of first utmost point ear with first convex part to improve the area of overflowing of first utmost point ear and end cover. The abutting plane is closer to the main body part than the first limiting part integrally, and the first convex part is beyond the first limiting part along the direction departing from the cover body.

In some embodiments, the battery cell further includes: and the first insulating piece is used for isolating the cover body from the shell so as to realize the insulated connection of the cover body and the shell.

Among the above-mentioned technical scheme, first insulating part plays the effect of keeping apart lid body and casing for keep insulating between lid body and the casing.

In some embodiments, the first insulator includes: an insulating part for isolating the cover body and the case; and the abutting part is connected with the insulating part and is used for abutting against the first tab.

In the technical scheme, the first insulating part comprises an insulating part and a pressing part connected with the insulating part, and the insulating part isolates the cover body from the shell so as to realize the insulating connection between the cover body and the shell; the pressing part presses the first lug, the pressing part limits the first lug, and the risk that the first lug is warped and contacted with the first limiting part to cause short circuit of the positive pole and the negative pole is reduced. That is to say, the first insulating part can play a role in limiting the first tab while realizing the insulation between the cover body and the shell.

In some embodiments, in the thickness direction, the pressing portion extends from the insulating portion in a direction facing the tab to press against the first tab.

Among the above-mentioned technical scheme, the portion of pressing extends along the direction towards utmost point ear from insulating part on the thickness direction of end cover for the portion of pressing plays better the effect of pressing to first utmost point ear, and first utmost point ear is more difficult to the perk.

In some embodiments, the pressing portion is located at an outer periphery of the first protruding portion, the first limiting portion is located at an outer periphery of the pressing portion, and the pressing portion is used for isolating the first protruding portion from the first limiting portion.

In the above technical scheme, the pressing portion is located at the periphery of the first convex portion, and the first limiting portion is located at the periphery of the pressing portion, that is, the pressing portion is located between the first convex portion and the first limiting portion, so that the pressing portion plays a role in isolating the first convex portion from the first limiting portion, and the risk of contact between the first convex portion and the first limiting portion is reduced.

In some embodiments, the pressing portion is a ring structure.

Among the above-mentioned technical scheme, the portion of suppressing is the loop configuration, can carry out whole week to pressing to first utmost point ear, plays better restriction to first utmost point ear.

In some embodiments, the cover body is sealingly connected to the housing through the first insulator.

Among the above-mentioned technical scheme, the lid body passes through first insulating part and casing sealing connection, and first insulating part both plays insulating effect between lid body and casing, plays sealed effect again.

In some embodiments, the housing further has a second stopper portion; in the thickness direction, the cover body is located on one side of the second limiting portion facing the electrode assembly, and the second limiting portion and the first limiting portion are used for jointly limiting the cover body to move along the thickness direction relative to the shell.

Among the above-mentioned technical scheme, the spacing portion of second and the spacing portion of first of casing all play limiting displacement to the lid body to the relative casing of cooperation restriction lid body moves along the thickness direction of end cover. The first limiting portion plays a role in limiting the cover body to move relative to the shell along the direction facing the electrode assembly, and the second limiting portion plays a role in limiting the cover body to move relative to the shell along the direction departing from the electrode assembly.

In some embodiments, the second limiting portion is a flanged structure formed by partially turning the housing inward and forming the second limiting portion at the opening.

In the above technical scheme, the second limiting part is a flanging structure which is formed at the opening position by partially turning the shell inwards, that is, the second limiting part can be formed at the opening position of the shell in a mode of turning the shell, and the forming is simple.

In some embodiments, the end cap further comprises a second protrusion protruding from the outer surface of the cap body in a direction away from the main body portion, and the outer surface of the second protrusion is flush with the outer surface of the second stopper portion.

Among the above-mentioned technical scheme, the surface of second convex part and the surface parallel and level of the spacing portion of second, the second convex part of being convenient for links to each other with the part that converges, guarantees that both connect the back and have great area of contact to overflow.

In some embodiments, the first tab is welded to the first tab.

In the technical scheme, the first convex part is welded on the first tab, so that the first convex part is always in good contact with the first tab. The first protruding part is connected with the first pole lug in a welding mode, and the implementation mode is simple.

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

In a third aspect, an embodiment of the present application provides an electric device, including the battery provided in any one of the embodiments of the second aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

fig. 3 is an exploded view of a battery cell provided in some embodiments of the present application;

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

fig. 5 is a partially enlarged view of the battery cell a shown in fig. 4;

fig. 6 is a partial view of the battery cell shown in fig. 4.

Icon: 10-a box body; 11-a first part; 12-a second part; 13-a containment chamber; 20-a battery cell; 21-an electrode assembly; 211-a body portion; 212 — a first tab; 213-a second tab; 214-a central aperture; 22-a housing; 221-opening; 222-a first stop portion; 223-a housing body; 2231-roller trough; 224-a cover; 225-a second limit portion; 23-end caps; 231-a cap body; 232-a first projection; 2321 — abutting against the plane; 233-a second projection; 234-liquid injection hole; 235-a flow guide channel; 236-a recess; 237-liquid level; 24-a sealed space; 25-a first insulator; 251-an insulating portion; 2511-a first insulating segment; 2512-a second insulating section; 2513-a third insulating section; 252-a press part; 26-a second insulator; 261-the enclosure; 262-a cover; 27-a closure; 100-a battery; 200-a controller; 300-a motor; 1000-a vehicle; z-thickness direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification 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 specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

For a general battery cell, the end cap needs to be electrically connected to the tab so that the end cap serves as an output electrode (positive output electrode or negative output electrode) of the battery cell, but after actual assembly, the end cap and the tab are prone to fail to be in good contact, so that the battery cell cannot be normally used. The inventor finds that, in a battery cell, the housing generally has a limiting portion, and the limiting portion limits the end cap to move in a direction facing the electrode assembly, in this case, the tab may also be limited by the limiting portion, so that the end cap and the tab may not normally contact or contact poorly, and the battery cell may not be normally used.

In view of this, the embodiment of the present application provides a technical solution, an end cover includes a cover body and a first protruding portion, the cover body is used for covering an opening of a case, the cover body is located on one side of the first limiting portion departing from the electrode assembly, the first protruding portion exceeds the first limiting portion along a direction departing from the cover body, so that the first protruding portion abuts against a first tab of the electrode assembly, good contact between the first protruding portion and the first tab is ensured, an overflowing area of the first tab and the end cover is increased, a risk that the first tab cannot contact with the end cover due to being limited by the first limiting portion of the case is reduced, and battery performance is ensured.

The technical scheme described in the embodiment of the application is suitable for the battery and the electric equipment using the battery.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described by taking an electric device as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure, a battery 100 is disposed inside the vehicle 1000, and the battery 100 may be disposed at a bottom portion, a head portion, or a tail portion of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000.

The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

In some embodiments, referring to fig. 2, fig. 2 is a schematic structural diagram of a battery 100 according to some embodiments of the present disclosure, where the battery 100 includes a case 10 and a battery cell 20, and the case 10 is used for accommodating the battery cell 20.

The case 10 may include a first portion 11 and a second portion 12, and the first portion 11 and the second portion 12 cover each other to define a receiving cavity 13 for receiving the battery cell 20. The first and second portions 11 and 12 may be in various shapes, such as rectangular parallelepiped, cylindrical, etc. The first portion 11 may be a hollow structure with one side open, the second portion 12 may also be a hollow structure with one side open, and the open side of the second portion 12 is covered on the open side of the first portion 11, so as to form the box body 10 with the accommodating cavity 13. As shown in fig. 2, the first portion 11 may have a hollow structure with one side open, the second portion 12 may have a plate-like structure, and the second portion 12 may cover the open side of the first portion 11 to form the case 10 having the housing chamber 13. Illustratively, in fig. 2, the first portion 11 and the second portion 12 are each a rectangular parallelepiped structure.

The first portion 11 and the second portion 12 may be sealed by a sealing element, which may be a sealing ring, a sealant, or the like.

In the battery 100, one or more battery cells 20 may be provided. If there are a plurality of battery cells 20, the plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 20 are connected in series or in parallel. A plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole, and may be accommodated in the case 10. Or all the battery cells 20 may be directly connected in series or in parallel or in series-parallel, and the whole of all the battery cells 20 is accommodated in the case 10.

In some embodiments, the battery 100 may further include a bus member, and the plurality of battery cells 20 may be electrically connected to each other through the bus member, so as to connect the plurality of battery cells 20 in series or in parallel or in series-parallel.

The bus member may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

Referring to fig. 3 and 4, fig. 3 is an exploded view of a battery cell 20 according to some embodiments of the present disclosure, and fig. 4 is a cross-sectional view of the battery cell 20 shown in fig. 3, where the battery cell 20 includes an electrode assembly 21, a case 22, and an end cap 23. The electrode assembly 21 includes a body portion 211 and a first tab 212, the first tab 212 protruding from one end of the body portion 211. The case 22 has an opening 221 and a first stopper 222, and the case 22 accommodates the electrode assembly 21. The end cap 23 includes a cap body 231, the cap body 231 is configured to cover the opening 221, in the thickness direction Z of the end cap 23, the cap body 231 is located on a side of the first limiting portion 222 away from the electrode assembly 21, and the first limiting portion 222 is configured to limit the movement of the cap body 231 relative to the case 22 along a direction facing the main body portion 211. The end cap 23 further includes a first protrusion 232 protruding from the inner surface of the cap body 231 in a direction facing the main body portion 211, and the first protrusion 232 is configured to exceed the first stopper portion 222 in a direction away from the cap body 231, so that the first protrusion 232 is pressed against the first tab 212.

Because the first convex part 232 of the end cover 23 exceeds the first limiting part 222 along the direction departing from the cover body 231, the first convex part 232 is enabled to be pressed against the first tab 212 in a protruding manner, good contact between the first convex part 232 and the first tab 212 is ensured, the flow area between the first tab 212 and the end cover 23 is increased, the risk that the first tab 212 cannot be contacted with the end cover 23 due to the limitation of the first limiting part 222 of the shell 22 is reduced, and the performance of the battery 100 is ensured.

The first protrusion 232 presses against the first tab 212, so that the end cap 23 is electrically connected to the first tab 212. In some embodiments, the first protrusion 232 may be fixedly connected with the first tab 212, for example, the first protrusion 232 is welded to the first tab 212, so that the first protrusion 232 always keeps good contact with the first tab 212. The first protruding part 232 is connected with the first tab 212 by welding, and the implementation manner is simple.

In some embodiments, the first protruding portion 232 has an abutting plane 2321 abutting against the first tab 212 in the thickness direction Z of the end cover 23 to increase the contact area of the first tab 212 and the first protruding portion 232, so as to increase the flow area of the first tab 212 and the end cover 23. The abutting plane 2321 is closer to the main body portion 211 than the first limiting portion 222 is, so that the first protruding portion 232 protrudes beyond the first limiting portion 222 along the direction away from the cover body 231.

In the actual assembly process, after the cover body 231 of the end cover 23 is fitted over the opening 221 of the housing 22 and pressed against the flat surface 2321 and against the first tab 212, the first protrusion 232 and the first tab 212 may be welded together on the outer side of the end cover 23, for example, the first protrusion 232 and the first tab 212 are welded by laser welding.

In some embodiments, the electrode assembly 21 may further include a second tab 213, and the first tab 212 and the second tab 213 have opposite polarities. A first tab 212 and a second tab 213 protrude from the body 211, the first tab 212 is used for electrically connecting with the end cap 23, and the second tab 213 is used for electrically connecting with the housing 22.

The first tab 212 and the second tab 213 may be provided at opposite ends of the body 211, or may be provided at the same end of the body 211. In fig. 4, a first tab 212 and a second tab 213 are provided at opposite ends of the body 211.

The main body portion 211 may include a positive electrode tab, a negative electrode tab, and a separator. The main body portion 211 may have a winding structure formed by winding a positive electrode tab, a separator, and a negative electrode tab. The main body portion 211 may have a stacked structure in which a positive electrode tab, a separator, and a negative electrode tab are stacked.

The positive pole piece comprises a positive current collector and positive active material layers coated on two opposite sides of the positive current collector. The negative pole piece comprises a negative current collector and negative active material layers coated on two opposite sides of the negative current collector. The body portion 211 may be a portion of the electrode assembly 21 corresponding to a region of the pole piece coated with the active material layer, and the tab may be a portion of the electrode assembly 21 corresponding to a region of the pole piece not coated with the active material layer.

One of the first tab 212 and the second tab 213 is a positive tab, and the other is a negative tab. That is, if the first tab 212 is a positive tab, the second tab 213 is a negative tab; if the first tab 212 is a negative tab, the second tab 213 is a positive tab. The positive electrode tab may be a region of the positive electrode tab not coated with the positive electrode active material layer, and the negative electrode tab may be a region of the negative electrode tab not coated with the negative electrode active material layer.

In the embodiment of the present application, the case 22 is used for accommodating the electrode assembly 21, and after the cover body 231 of the end cover 23 is covered on the opening 221 of the case 22, the end cover 23 and the case 22 together form the sealed space 24 for accommodating the electrode assembly 21 and the electrolyte, which may be an electrolyte.

The housing 22 may be of various shapes such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case 22 may be determined according to the specific shape of the electrode assembly 21. For example, if the electrode assembly 21 has a cylindrical structure, the case 22 may alternatively have a cylindrical structure; if the electrode assembly 21 has a rectangular parallelepiped structure, the case 22 may have a rectangular parallelepiped structure. Illustratively, in FIG. 4, the housing 22 is a hollow cylindrical structure.

The housing 22 may be made of metal, such as copper, iron, aluminum, steel, aluminum alloy, etc.

In some embodiments, with continued reference to fig. 4, the housing 22 may include a housing body 223 and a cover 224, the housing body 223 is a hollow structure with two open ends, the cover 224 is connected to one end of the housing body 223, so that the other end of the housing body 223 forms an opening 221, and the cover body 231 of the end cover 23 covers the opening 221.

Illustratively, the first tab 212 of the electrode assembly 21 is electrically connected to the end cap 23, and the second tab 213 of the electrode assembly 21 is electrically connected to the cover 224 of the case 22. The first tab 212 and the end cover 23 and the second tab 213 and the cover body 224 may be connected by welding.

The covering body 224 and the housing body 223 may be an integrally formed structure or a split structure. In the case that the cover 224 and the housing body 223 are of a split structure, the structure of the cover 224 and the structure of the end cap 23 may be the same or different, the connection manner between the cover 224 and the housing body 223 and the connection manner between the end cap 23 and the housing body 223 may be the same or different, and the connection manner between the cover 224 and the second tab 213 and the connection manner between the end cap 23 and the first tab 212 may be the same or different.

Illustratively, in fig. 4, the housing body 223 is a cylindrical structure, the covering body 224 is a plate-shaped structure, and the covering body 224 and the housing body 223 are split structures.

In some embodiments, the first stopper 222 of the case 22 covers at least a portion of the first tab 212 in the thickness direction Z of the end cap 23, and the first stopper 222 may function to restrict the electrode assembly 21 from being separated from the case 22 from the opening 221 of the case 22.

Specifically, the first stopper 222 is formed in a case body 223 of the case 22. For example, the first stopper 222 may be a ring-shaped structure protruding from the inner circumferential surface of the case body 223.

Alternatively, a roller groove 2231 is formed on the outer circumferential surface of the case body 223 at a position corresponding to the first stopper 222. In the actual molding process, the roller groove 2231 may be rolled out on the outer circumferential surface of the case body 223 by a rolling manner, and the first stopper 222 may be formed inwardly on the inner circumferential surface of the case body 223.

The cover body 231 of the end cover 23 may be insulated from or electrically connected to the housing 22. If the covering body 224 and the housing body 223 are an integral structure, or the covering body 224 and the housing body 223 are a split structure, and the covering body 224 is electrically connected to the housing body 223, the covering body 231 and the housing body 223 of the housing 22 can be insulated and connected to reduce the risk of short circuit; if the shielding body 224 and the housing body 223 are a split structure, and the shielding body 224 and the housing body 223 are connected in an insulating manner, the cover body 231 and the housing body 223 of the housing 22 can be electrically connected to reduce the risk of short circuit.

In some embodiments, referring to fig. 5, fig. 5 is a partial enlarged view of the battery cell 20 shown in fig. 4, the battery cell 20 further includes a first insulating member 25, and the first insulating member 25 is used for isolating the cover body 231 from the housing 22 to achieve an insulating connection between the cover body 231 and the housing 22, so that the cover body 231 and the housing 22 are insulated from each other. It can be understood that the cover body 231 is insulated from the housing 22 by the first insulating member 25, that is, the cover body 231 is insulated from the housing body 223 of the housing 22 by the first insulating member 25.

Since the cover body 231 and the housing 22 are connected in an insulated manner by the first insulating member 25, even if the housing 22 and the end cap 23 are charged with electricity of different polarities, the cover body 231 is less likely to come into contact with the housing 22 and cause a short circuit. However, if the first tab 212 is tilted to contact the first position-limiting portion 222 of the housing 22, a short circuit may still occur.

In the embodiment of the present application, since the first protruding portion 232 of the end cap 23 exceeds the first limiting portion 222 along the direction departing from the cap body 231, and the first protruding portion 232 abuts against the first tab 212, the first protruding portion 232 can limit the first tab 212, so as to reduce the risk of short circuit between the positive and negative electrodes caused by the tab tilting contacting with the first limiting portion 222.

The first insulating member 25 may be made of an insulating material such as plastic or rubber.

The end cap 23 may serve as one output pole of the battery cell 20, and the case body 223 or the cover 224 of the housing 22 may serve as the other output pole of the battery cell 20. The end cover 23 can be used as a positive output pole, and the shell body 223 or the covering body 224 can be used as a negative output pole; the end cap 23 may be used as the negative output pole, and the housing body 223 or the covering body 224 may be used as the integral output pole. The positive and negative output electrodes are portions of the battery cell 20 for connecting with other components and outputting the electric power of the battery cell 20. Taking the case that two single batteries 20 are electrically connected through the bus bar, and two single batteries 20 are connected in series, the positive output electrode of one single battery 20 and the negative output electrode of the other single battery 20 are both welded to the same bus bar.

In some embodiments, the cover body 231 is hermetically connected to the housing 22 through the first insulating member 25, i.e., the first insulating member 25 performs both an insulating function and a sealing function between the cover body 231 and the housing 22.

In some embodiments, the first insulator 25 includes an insulator 251 and a press 252. The insulating portion 251 is used to isolate the cover body 231 from the housing 22 to achieve an insulating connection of the cover body 231 with the housing 22. The pressing portion 252 is connected with the insulating portion 251, the pressing portion 252 is used for pressing the first tab 212, and the pressing portion 252 limits the first tab 212, so that the risk of anode and cathode short circuit caused by the tilting of the first tab 212 contacting with the first limiting portion 222 is reduced. That is, the first insulator 25 may restrict the first tab 212 while achieving insulation between the cover body 231 and the case 22.

Illustratively, the cover body 231 is hermetically connected to the housing 22 through the insulation 251 of the first insulator 25.

In some embodiments, the insulation portion 251 may include a first insulation segment 2511, a second insulation segment 2512 and a third insulation segment 2513, and the pressing portion 252, the first insulation segment 2511, the second insulation segment 2512 and the third insulation segment 2513 are sequentially connected. The first insulating segment 2511 and the third insulating segment 2513 are respectively located on two sides of the cover body 231 in the thickness direction Z of the end cover 23, and the cover body 231 abuts against the first limiting part 222 through the first insulating segment 2511, so that the first limiting part 222 limits the cover body 231 to limit the cover body 231 to move in the direction facing the main body part 211. The second insulating section 2512 is located between the inner circumferential surface of the housing 22 and the outer circumferential surface of the cap body 231. The insulating portion 251 having such a structure can perform both a good insulating function and a good sealing function between the cover body 231 and the housing 22.

Illustratively, the first, second, and third insulating segments 2511, 2512, 2513 are each annular structures extending circumferentially of the cap body 231.

In some embodiments, the pressing portion 252 extends from the insulating portion 251 in a direction facing the tab in the thickness direction Z of the end cap 23, so that the pressing portion 252 presses against the first tab 212. With the structure, the pressing part 252 has a better pressing effect on the first tab 212, and the first tab 212 is less prone to tilting.

Illustratively, in the thickness direction Z of the end cap 23, the pressing portion 252 extends from the first insulation section 2511 of the insulation portion 251 in a direction facing the first tab 212.

In some embodiments, the pressing portion 252 is located at the periphery of the first protruding portion 232, the first position-limiting portion 222 is located at the periphery of the pressing portion 252, and the pressing portion 252 is used for separating the first protruding portion 232 and the first position-limiting portion 222.

That is to say, the pressing portion 252 is located between the first protruding portion 232 and the first limiting portion 222, so that the pressing portion 252 has an effect of isolating the first protruding portion 232 from the first limiting portion 222, and the risk of short circuit caused by the contact between the first protruding portion 232 and the first limiting portion 222 is reduced.

In some embodiments, the pressing portion 252 is a ring-shaped structure. The pressing part 252 with such a structure can press the first tab 212 in the whole circumference, and plays a better role in limiting the first tab 212.

Illustratively, the pressing portion 252 is an annular structure surrounding the outer periphery of the first protrusion 232. The pressing portion 252 having such a structure can completely separate the first protrusion 232 from the first position-limiting portion 222.

In the embodiment of the present application, the pressing portion 252 presses against the first tab 212, the pressing portion 252 may directly press against the first tab 212, or the pressing portion 252 may indirectly press against the first tab 212.

In some embodiments, the battery cell 20 further includes a second insulator 26, and the second insulator 26 is used for isolating the first tab 212 and the first position-limiting portion 222. In the thickness direction Z of the end cover 23, the second insulating member 26 covers a portion of the first tab 212, and the pressing portion 252 presses against the first tab 212 through the portion of the first insulating member 25 covering the first tab 212. It can be understood that the pressing portion 252 presses against the second insulating member 26 along the direction facing the main body portion 211, so as to prevent the second insulating member 26 from tilting.

The second insulating member 26 may be an insulating material such as plastic, rubber, etc.

Illustratively, the second insulating member 26 includes a surrounding body 261 surrounding the outer periphery of the body portion 211 of the electrode assembly 21, and a covering portion 262 connected to one end of the surrounding body 261 in the thickness direction Z of the end cap 23, the covering portion 262 covers a portion of the first tab 212, and the pressing portion 252 presses against the first tab 212 through the covering portion 262.

In some embodiments, with reference to fig. 5, the case 22 further has a second position-limiting portion 225, in the thickness direction Z, the cover body 231 is located on a side of the second position-limiting portion 225 facing the electrode assembly 21, and the second position-limiting portion 225 and the first position-limiting portion 222 are used for jointly limiting the movement of the cover body 231 relative to the case 22 along the thickness direction Z.

The first stopper 222 serves to restrict the movement of the cap body 231 relative to the case 22 in a direction facing the electrode assembly 21, and the second stopper 225 serves to restrict the movement of the cap body 231 relative to the case 22 in a direction away from the electrode assembly 21.

Optionally, the second limiting portion 225 is a flanged structure formed by partially folding the housing 22 inward and forming the opening 221. That is, by folding the housing 22, the second stopper 225 can be formed at the opening 221 of the housing 22, and molding is simple. In the process of assembling the battery cell 20, the electrode assembly 21 may be accommodated in the case 22, the end cap 23 is covered on the opening 221 of the case 22, and the second limiting portion 225 is formed by folding the case 22, so as to limit the end cap 23.

Specifically, the second limiting portion 225 is a flanged structure formed by partially folding the housing body 223 of the housing 22 inward and forming the opening 221.

Illustratively, the second stopper 225 has an annular configuration.

In some embodiments, as shown in fig. 5, in the case that the cover body 231 and the housing 22 are in insulation connection through the first insulating member 25, the second limiting portion 225 may be pressed against the cover body 231 by the third insulating section 2513, so that the third insulating section 2513 is located between the inner surface of the second limiting portion 225 and the outer surface of the cover body 231 in the thickness direction Z of the end cap 23.

In other embodiments, if the cover body 231 is electrically connected to the housing 22, the first position-limiting portion 222 and the second position-limiting portion 225 may directly abut against the inner surface and the outer surface of the cover body 231, in which case, the housing body 223 of the housing 22 may be in insulated connection with the covering body 224.

In some embodiments, referring to fig. 6, fig. 6 is a partial view of the battery cell 20 shown in fig. 4, the end cap 23 further includes a second protrusion 233 protruding from an outer surface of the cap body 231 in a direction away from the main body portion 211, and an outer surface of the second protrusion 233 is flush with an outer surface of the second limiting portion 225, so that the second protrusion 233 is connected to the bus member, and a larger contact area is ensured after the connection between the second protrusion 233 and the bus member, so as to facilitate overcurrent.

Illustratively, the second stopper 225 is disposed around the outer circumference of the second protrusion 233.

In some embodiments, the second limiting portion 225 and the second protruding portion 233 are two output electrodes of the battery cell 20, respectively. The second convex portion 233 may serve as a positive output electrode, and the second stopper 225 may serve as a negative output electrode. The second convex portion 233 may serve as a negative output electrode, and the second stopper 225 may serve as a positive output electrode. Taking the example that two single batteries 20 are electrically connected through the bus bar, and the two single batteries 20 are connected in series, the second limiting portion 225 of one single battery 20 and the second protruding portion 233 of the other single battery 20 are both welded to the same bus bar.

Since the outer surface of the second convex portion 233 is flush with the outer surface of the second stopper portion 225, it is ensured that the outer surface of the second stopper portion 225 can be connected to one bus member after the outer surface of the second convex portion 233 is connected to the other bus member.

In some embodiments, referring to fig. 6, the end cap 23 is provided with a liquid injection hole 234, and the electrolyte can be injected into the battery cell 20 through the liquid injection hole 234. The outer peripheral surface of the first projection 232 is located on the outer periphery of the injection hole 234, and the first projection 232 is provided with a flow guide passage 235, and the flow guide passage 235 is used for allowing the electrolyte to flow to the outside of the outer peripheral surface of the first projection 232.

When electrolyte is injected into the battery cell 20 through the injection hole 234, the electrolyte can flow laterally from the flow guide channel 235 and finally flows to the outside of the outer peripheral surface of the first protruding portion 232, so that the injection efficiency is improved, efficient injection is realized, and the electrolyte can more easily infiltrate the pole pieces in the electrode assembly 21.

Illustratively, the pour hole 234 is disposed coaxially with the outer peripheral surface of the first projection 232.

The number of the flow guide passages 235 of the first protrusion 232 may be one or more. If there are multiple flow guide channels 235, the multiple flow guide channels 235 may be circumferentially spaced around the injection hole 234 at intervals.

In some embodiments, the electrode assembly 21 has a central hole 214, and the flow guide channel 235 is disposed coaxially with the central hole 214 in the thickness direction Z of the end cap 23, so that the electrolyte entering the electrolyte injection hole 234 can directly enter the central hole 214 to wet the pole pieces in the electrode assembly 21.

In some embodiments, the end cap 23 is provided with a concave portion 236, and the concave portion 236 is recessed from an end of the first convex portion 232 opposite to the first tab 212 toward a direction away from the main body portion 211. Both ends of the guide passage 235 penetrate the inner circumferential surface of the concave portion 236 and the outer circumferential surface of the first convex portion 232, respectively. The end cap 23 has a liquid outlet surface 237 located in the concave portion 236, the bottom end of the liquid injection hole 234 penetrates through the liquid level 237, and the liquid outlet surface 237 is farther from the electrode assembly 21 than the abutting plane 2321 of the first convex portion 232 in the thickness direction Z of the end cap 23, so that the liquid outlet surface 237 is distant from the first tab 212 in the thickness direction Z of the end cap 23. With the structure, the electrode solution enters the battery cell 20 through the injection hole 234, then enters the concave part 236 and then enters the flow guide channel 235, so that the electrolyte can flow laterally to the outside of the outer peripheral surface of the first convex part 232.

Illustratively, the flow guide channel 235 is a groove disposed against the flat surface 2321 and penetrating an inner circumferential surface of the concave portion 236 and an outer circumferential surface of the first convex portion 232.

In some embodiments, the battery cell 20 further includes a blocking member 27, and the blocking member 27 is used for blocking the liquid injection hole 234. After the liquid injection into the battery cell 20 through the liquid injection hole 234 is completed, the liquid injection hole 234 may be closed by the closing member 27.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The above embodiments are merely for illustrating the technical solutions of the present application and are not intended to limit the present application, and those skilled in the art can make various modifications and variations of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (14)

1. A battery cell, comprising:

the electrode assembly comprises a main body part and a first tab, wherein the first tab is convexly arranged at one end of the main body part;

a case having an opening and a first stopper, the case accommodating the electrode assembly;

the end cover comprises a cover body, the cover body is used for covering the opening, the cover body is positioned on one side, away from the electrode assembly, of the first limiting part in the thickness direction of the end cover, and the first limiting part is used for limiting the cover body to move relative to the shell along the direction facing the main body part;

the end cover further comprises a first convex part protruding from the inner surface of the cover body in the direction facing the main body part, and the first convex part is configured to exceed the first limiting part in the direction away from the cover body, so that the first convex part is pressed against the first tab.

2. The battery cell as recited in claim 1, wherein the first convex portion has an abutting plane that abuts against the first tab in the thickness direction, the abutting plane being closer to the main body portion than the first stopper portion as a whole.

3. The battery cell of claim 1, further comprising:

and the first insulating piece is used for isolating the cover body from the shell so as to realize the insulated connection of the cover body and the shell.

4. The battery cell according to claim 3, wherein the first insulating member includes:

an insulating part for isolating the cover body and the case;

and the abutting part is connected with the insulating part and is used for abutting against the first tab.

5. The battery cell as recited in claim 4, wherein the pressing portion extends from the insulating portion in a direction facing the tab in the thickness direction to press against the first tab.

6. The battery cell as claimed in claim 4, wherein the pressing portion is located at an outer periphery of the first protrusion, the first limiting portion is located at an outer periphery of the pressing portion, and the pressing portion is used for separating the first protrusion from the first limiting portion.

7. The battery cell as claimed in claim 4, wherein the pressing portion is of an annular structure.

8. The battery cell as recited in claim 3 wherein the cover body is sealingly connected to the housing through the first insulator.

9. The battery cell of any of claims 1-8, wherein the housing further comprises a second retention feature;

in the thickness direction, the cover body is located on one side of the second limiting portion facing the electrode assembly, and the second limiting portion and the first limiting portion are used for jointly limiting the cover body to move along the thickness direction relative to the shell.

10. The battery cell as recited in claim 9, wherein the second limiting portion is a flanging structure formed at the opening position and partially folded inward of the housing.

11. The battery cell as recited in claim 9, wherein the end cap further comprises a second protrusion protruding from an outer surface of the cap body in a direction away from the main body portion, the outer surface of the second protrusion being flush with an outer surface of the second retainer.

12. The battery cell according to any one of claims 1-8, wherein the first tab is welded to the first tab.

13. A battery, comprising:

a battery cell according to any one of claims 1-12; and

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

14. An electrical device comprising the battery of claim 13.

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