CN218827692U - Connecting piece, battery monomer, battery and power consumption device - Google Patents

Abstract

The application discloses connecting piece, battery monomer, battery and power consumption device. The connector is used for leading the electric current of electrode subassembly to the end cover, and the connector includes: the first connecting part is connected with the end cover; the second connecting portion are connected with the first connecting portion in an angled mode and comprise a body and a fusing portion, the body is connected with the electrode lug of the electrode assembly, two ends of the fusing portion are connected with the body and the first connecting portion respectively, and the cross-sectional area of the fusing portion is smaller than that of the body. Among the technical scheme of this application embodiment, first connecting portion are connected with the second connecting portion angulation, and fusing portion sets up at the second connecting portion for fusing portion can correspond the tip setting of electrode subassembly, and the high temperature when avoiding fusing causes the damage to the barrier film on the electrode subassembly, reduces the probability that fusing ageing caused the short circuit.

Description

Connecting piece, battery monomer, battery and power consumption device

Technical Field

The application relates to the field of batteries, in particular to a connecting piece, a battery monomer, a battery and an electric device.

Background

The lithium ion battery has the advantages of high energy density, long cycle life, small environmental pollution and the like, and is widely applied to electronic equipment such as mobile phones, tablet computers, notebook computers, wind generating sets, solar power stations and the like.

In a lithium ion battery cell, an interposer is generally provided to conduct current between an electrode assembly and a terminal post. When the battery is short-circuited, the current on the switching piece is suddenly increased. When the current on the adapter sheet exceeds a preset value, fusing can occur. The internal temperature of the electrode assembly can rise in the fusing process, so that the isolating membrane in the electrode assembly is damaged, and the fusing cannot play a role in safety protection.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the application provides a connecting piece, battery monomer, battery and power consumption device, can protect the barrier film in the electrode subassembly, prevents that the barrier film from damaging the electrode subassembly short circuit that causes, promotes the free security performance of battery.

In a first aspect, the present application provides a connector for directing current from an electrode assembly to an end cap, the connector comprising:

the first connecting part is connected with the end cover;

the second connecting portion is connected with the first connecting portion at an angle, the second connecting portion comprises a body and a fusing portion, the body is connected with a pole lug of the electrode assembly, two ends of the fusing portion are connected with the body and the first connecting portion respectively, and the cross-sectional area of the fusing portion is smaller than that of the body.

In the technical scheme of this application embodiment, be connected with the end cover through setting up first connecting portion, the second connecting portion are connected with utmost point ear, conduct the electric current of utmost point ear to the end cover to set up fusing portion and in order to fuse when the electric current that flows through the connecting piece surpasss safe electric current, in order to guarantee electrode subassembly's security. And first connecting portion and second connecting portion are connected at an angle, and fusing portion sets up at the second connecting portion for fusing portion can correspond the tip setting of electrode subassembly, and the high temperature when avoiding fusing causes the damage to the barrier film on the electrode subassembly, reduces fusing ageing and causes the probability of short circuit.

In some embodiments, the first connection portion and the second connection portion are perpendicular to each other. The structure can further improve the safety and the installation convenience of the electrode assembly.

In some embodiments, the fusing part has a through hole or an opening penetrating in a thickness direction of the second connection part. The cross-sectional area of the fusing part is reduced by arranging the through hole or the opening, the structure is simple, and the manufacturing is convenient.

In some embodiments, the thickness of the fusing part is less than the thickness of the body or the first connecting part. The thickness of the fusing part is reduced, so that the purpose of reducing the cross sectional area of the fusing part is achieved.

In some embodiments, the connector further comprises a protective sheath disposed around the fuse. Through setting up the lag, parcel fusing portion prevents that high temperature from causing the injury to electrode subassembly at the fusing in-process, promotes the security performance.

In some embodiments, the protective cover further comprises an extension portion extending in the direction of the first connecting portion and formed by bending, and the extension portion surrounds at least part of the first connecting portion. Among the foretell technical scheme, through setting up the extension, improved the stability of being connected of protective sheath and first connecting portion, promoted the security performance.

In some embodiments, the second connection portion further includes a welding connection piece connected to an edge of the body, the welding connection piece being disposed at an end of the fusing portion away from the first connection portion, the welding connection piece being used to connect tabs of the electrode assembly. Through setting up the welding connection piece, increased the area that utmost point ear and second connecting portion are connected, promoted welded efficiency and increased the overcurrent area of electric current on the second connecting portion.

In some embodiments, the number of the welding connecting sheets is two, and the two welding connecting sheets are oppositely arranged on two sides of the body. The structure can balance the stress on two sides of the body, and the installation stability and the safety performance of the battery are improved.

In some embodiments, the connecting tab further comprises an insulator disposed about the body. Set up the insulating part, insulate between connection piece and the free shell of battery, form the protection to the connection piece simultaneously, prevent that welded metal fillings from causing the damage to the connecting piece.

In some embodiments, the first connecting portion is provided with a pole connecting hole. By the structure, the connecting piece is connected with the pole terminal of the end cover, so that the stability of current and the efficiency of connecting piece installation are improved.

In some embodiments, the minimum distance H of the fusing part from the first connecting part and the minimum thickness D of the first connecting part satisfy the relationship: h is more than or equal to 3D. Through setting up fusing portion in reasonable position, when guaranteeing that fusing function is normal, prevent that fusing portion from causing the damage to motor element's barrier film.

In a second aspect, the present application also provides a battery cell, including the connecting member in the above embodiment; the end cover is connected with the first connecting part; the shell is provided with an accommodating cavity and an opening, and the end cover covers the opening; and the electrode assembly is arranged in the accommodating cavity, and a tab of the electrode assembly is connected with the body. The second connecting part is arranged on one side of the end cover and connected with the pole lug in the structure, so that the insulating film of the winding part of the electrode assembly is prevented from being damaged by high temperature in the fusing process on the second connecting part, and the electrode assembly is prevented from being short-circuited.

In some embodiments, the case includes a bottom wall disposed opposite the end cap, two first sidewalls disposed opposite to each other, and two second sidewalls disposed opposite to each other, the first sidewalls having an area smaller than that of the second sidewalls, wherein the second connection part of the connection member is disposed between the first sidewalls and the electrode assembly. The structure can increase the number of winding turns of the electrode assembly as much as possible, and simultaneously ensure the installation space of the connecting piece.

In some embodiments, the electrode assembly includes a positive electrode tab, a separator, and a negative electrode tab that are arranged in a stack, the positive electrode tab, the separator, and the negative electrode tab being wound around a first axis, the first axis being arranged in a thickness direction of the first side wall. The arrangement mode increases the maximum number of winding turns of the electrode assembly as much as possible, improves the space utilization rate of the shell and effectively improves the energy density of the battery monomer.

In a third aspect, the present application further provides a battery, which includes the battery cell in the foregoing embodiment.

In a fourth aspect, the present application further provides an electric device, where the electric device includes the battery in the above embodiments, and the battery is used to provide electric energy.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present application;

fig. 2 is an exploded schematic view of a battery provided in accordance with an embodiment of the present application;

fig. 3 is an exploded view of a battery cell in a battery provided in accordance with an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a connector according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a connector according to another embodiment of the present application;

FIG. 6 is a schematic view of a connector according to another embodiment of the present application;

FIG. 7 is a cross-sectional structural view of a connection provided in accordance with an embodiment of the present application;

fig. 8 is an exploded view of a battery cell according to another embodiment of the present disclosure.

In the drawings, the drawings are not necessarily drawn to scale.

Description of reference numerals:

1. a vehicle; 2. a battery; 24. a pressure relief mechanism; 25. an electrode terminal; 3. a controller;

4. a motor; 5. a housing; 51. a first portion; 52. a second portion; 53. an accommodating space;

6. a battery module; 7. a battery cell; 10. an electrode unit; 11. an electrode assembly; 12. a tab; 20. a housing; 201. a bottom wall; 202. a first sidewall, 203, a second sidewall; 21. an opening; 30. An end cap; 40. a protective layer;

8. a connecting member; 801. a first connection portion; 802. a second connecting portion; 803. a body; 804. a fusing part; 805. a protective sleeve; 806. an extension portion; 807. welding the connecting sheet; 808. and (6) connecting the pole to the hole.

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 obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to 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 figures above, 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 should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "attached" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 this application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the embodiment of the present application is not limited thereto. 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 housing for enclosing one or more battery cells. The housing can prevent liquid or other foreign matters from influencing the charging or discharging of the battery cells.

The battery cell includes an electrode unit including at least one electrode assembly including a positive electrode tab, a negative electrode tab, and a separator, and an electrolyte. 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 comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive electrode current collector comprises a positive electrode current collecting portion and a positive electrode convex portion protruding out of the positive electrode current collecting portion, the positive electrode current collecting portion is coated with a positive electrode active substance layer, at least part of the positive electrode convex portion is not coated with the positive electrode active substance layer, and the positive electrode convex portion serves as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative convex part protruding out of the negative current collecting part, the negative current collecting part is coated with a negative active material layer, at least part of the negative convex part is not coated with the negative active material layer, and the negative convex part is used as a negative electrode tab. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, 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 spacer 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.

The technical solution described in the embodiment of the present application is applicable to the battery 2 and the electric device using the battery 2. The power consuming device may be a vehicle 1, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 1 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; the 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 power utilization device.

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

Fig. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application. As shown in fig. 1, a battery 2 is provided inside a vehicle 1, and the battery 2 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, and for example, the battery 2 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being adapted to control the battery 2 to power the motor 4, e.g. for start-up, navigation and operational power demands while driving of the vehicle 1.

In some embodiments of the present application, the battery 2 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part instead of fuel or natural gas, to provide driving power to the vehicle 1.

Fig. 2 is an exploded view of a battery 2 according to an embodiment of the present disclosure. As shown in fig. 2, the battery 2 includes a case 5 and a battery module 6, the battery module 6 is composed of a plurality of battery cells, and the battery module 6 is accommodated in the case 5.

The housing 5 is used to house the battery cells, and the housing 5 may have various structures. In some embodiments, the housing 5 may include a first portion 51 and a second portion 52, the first portion 51 and the second portion 52 cover each other, and the first portion 51 and the second portion 52 together define a receiving space 53 for receiving the battery cell. The second part 52 may be a hollow structure with one open end, the first part 51 is a plate-shaped structure, and the first part 51 covers the open side of the second part 52 to form the housing 5 with the accommodating space 53; the first and second portions 51 and 52 may be hollow structures with one side opened, and the opened side of the first portion 51 is covered with the opened side of the second portion 52 to form the housing 5 having the receiving space 53. Of course, the first and second portions 51 and 52 may be various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In order to improve the sealing property after the first portion 51 is connected to the second portion 52, a sealing member, such as a sealant, a sealing ring, or the like, may be disposed between the first portion 51 and the second portion 52.

Assuming that the first portion 51 covers the top of the second portion 52, the first portion 51 may also be referred to as an upper case cover, and the second portion 52 may also be referred to as a lower case body.

In the battery 2, one or more battery cells may be provided. If the number of the battery monomers is multiple, the multiple battery monomers can be connected in series or in parallel or in series-parallel, and the series-parallel refers to that the multiple battery monomers are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers is accommodated in the shell 5; of course, a plurality of battery cells may be connected in series, in parallel, or in series-parallel to form the battery module 6, and a plurality of battery modules 6 may be connected in series, in parallel, or in series-parallel to form a whole and accommodated in the housing 5.

Fig. 3 is an exploded view of a battery cell in a battery according to an embodiment of the present disclosure. In some embodiments, the battery unit 7 is multiple, and the multiple battery units 7 are connected in series or in parallel or in series-parallel to form the battery module 6. A plurality of battery modules 6 are connected in series or in parallel or in series-parallel to form a whole and are accommodated in the case.

The plurality of battery cells 7 in the battery module 6 may be electrically connected to each other by a bus member, so as to realize parallel connection, series connection, or parallel-series connection of the plurality of battery cells 7 in the battery module 6.

The battery cell 7 of the embodiment of the present application includes an electrode unit 10, a case 20, and an end cap assembly 30. The case 20 has an opening 21, the electrode unit 10 is accommodated in the case 20, and the cap assembly 30 is connected to the case 20 and covers the opening 21.

The electrode unit 10 includes at least one electrode assembly 11. Illustratively, the electrode unit 10 in fig. 3 includes two electrode assemblies 11. The electrode assembly 11 includes a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 11 may be a wound electrode assembly, a laminated electrode assembly, or other form of electrode assembly.

In some embodiments, electrode assembly 11 is a wound electrode assembly. The positive pole piece, the negative pole piece and the separator are all of a belt-shaped structure. The positive electrode plate, the separator and the negative electrode plate can be sequentially stacked and wound for more than two turns to form the electrode assembly 11.

In other embodiments, the electrode assembly 11 is a laminated electrode assembly. Specifically, the electrode assembly 11 includes a plurality of positive electrode tabs and a plurality of negative electrode tabs, which are alternately laminated in a direction parallel to the thickness direction of the positive electrode tabs and the thickness direction of the negative electrode tabs.

The electrode unit 10 includes at least one electrode assembly 11. That is, in the battery cell 7, one or more electrode assemblies 11 may be accommodated in the case 20.

The housing 20 has a hollow structure with one side opened. The end cap assembly 30 covers the opening of the case 20 and forms a sealing connection to form a receiving chamber for receiving the electrode unit 10 and the electrolyte.

The housing 20 may be in various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the housing 20 may be determined according to the specific shape of the electrode unit 10. For example, if the electrode unit 10 has a cylindrical structure, it can be selected as a cylindrical shell; if the electrode unit 10 has a rectangular parallelepiped structure, a rectangular parallelepiped case can be used. Of course, the end cap assembly 30 may have a variety of configurations, such as a plate-like configuration or a hollow configuration with an open end. Illustratively, the housing 20 has a rectangular parallelepiped structure, the end cap assembly 30 has a plate-shaped structure, and the end cap assembly 30 covers an opening at the top of the housing 20.

The end cap assembly 30 also includes an electrode terminal 25. In some embodiments, the electrode terminals 25 are provided in two, and the two electrode terminals 25 are defined as a positive electrode terminal and a negative electrode terminal, respectively. The positive electrode terminal and the negative electrode terminal are electrically connected to the positive tab portion and the negative tab portion of the electrode assembly 11, respectively, to output the current generated from the electrode assembly 11.

The end cap assembly 30 further includes a pressure relief mechanism 24, and the pressure relief mechanism 24 is used for relieving the internal pressure or temperature of the battery cell 7 when the internal pressure or temperature of the battery cell 7 reaches a predetermined value. Illustratively, the pressure relief mechanism 24 is located between the positive electrode terminal and the negative electrode terminal, and the pressure relief mechanism 24 may be a component such as an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure relief valve, or a safety valve.

In some embodiments, the housing 20 may also be a hollow structure with two opposite sides open. The end cap assembly 30 includes two end cap assemblies 30, and the two end cap assemblies 30 respectively cover the two openings of the casing 20 and are hermetically connected to form a containing cavity for containing the electrode unit 10 and the electrolyte. In some examples, the positive electrode terminal and the negative electrode terminal may be mounted on the same end cap assembly 30. In other examples, the positive and negative electrode terminals are mounted on the two end cap assemblies 30, respectively.

In a single battery, an adaptor sheet is usually disposed, and two ends of the adaptor sheet are respectively connected to the tab and the end cap to conduct current between the electrode assembly and the end cap. An external device or charging device is connected to the end cap to conduct current to or charge the electrode assembly. The adapter plate generally plays a role in protection while playing a role in electric energy conduction. Some of the switching sheets are provided with overcurrent protection devices, and when the current on the switching sheets exceeds a threshold value, the switching sheets are automatically disconnected.

However, even if the overcurrent protection device is arranged on some switching sheets, the current cannot be cut off. The inventor finds that the temperature of the adapter sheet rises when the adapter sheet is fused, the isolating film in the electrode assembly is burnt, and the positive and negative pole pieces are conducted to generate short circuit. If the current is not cut off in time, when the current continues to increase, more serious consequences such as explosion, fire and the like are likely to be caused.

In order to prevent the above situation and improve the safety of the battery cell in the operation process, the inventor designs a connecting member. For directing current from the electrode assembly to the end cap, the connector comprising: a first connection portion and a second connection portion connected at an angle. The first connecting part is connected with the end cover; the second connecting portion comprises a body and a fusing portion, the body is connected with a pole lug of the electrode assembly, two ends of the fusing portion are connected with the body and the first connecting portion respectively, and the cross-sectional area of the fusing portion is smaller than that of the body.

In the technical scheme of this application embodiment, first connecting portion and second connecting portion are connected at an angle, and fusing portion sets up at the second connecting portion for fusing portion can correspond the tip setting of electrode subassembly, and the high temperature when avoiding fusing causes the damage to the barrier film on the electrode subassembly, reduces the fusing ageing probability that causes the short circuit. Specific examples of the connecting sheet in the present application will be described in detail below.

With continuing reference to fig. 4 to 8, fig. 4 is a schematic structural diagram of a connecting member 8 according to an embodiment of the present disclosure; fig. 5 is a schematic structural diagram of a connecting member 8 according to another embodiment of the present application; fig. 6 is a schematic structural diagram of a connecting member 8 according to another embodiment of the present application; FIG. 7 is a cross-sectional view of a connector 8 according to an embodiment of the present application; fig. 8 is an exploded view of a battery cell 7 according to another embodiment of the present disclosure.

As shown in fig. 4, the embodiment of the present application provides a connector 8 for leading current of the electrode assembly 11 to the end cap 30. The connecting member 8 includes: a first connection 801 and a second connection 802. The first connection 801 is connected to the end cap 30. The second connection portion 802 is connected at an angle to the first connection portion 801. The second connection portion 802 includes a body 803 and a fuse portion 804, the body 803 is connected to a tab of an electrode assembly, both ends of the fuse portion 804 are respectively connected to the body 803 and the first connection portion 801, and a cross-sectional area of the fuse portion 804 is smaller than a cross-sectional area of the body 803.

The first connection part 801 has a plate-like structure, and the first connection part 801 has two opposite surfaces, one of which faces the end cap 30 assembly and the other of which faces the electrode assembly. The second connection part 802 also has a plate-shaped structure, and the second connection part 802 also has two opposite surfaces, one of which is disposed toward the case and the other of which is disposed toward the electrode assembly.

The first connection portion 801 and the second connection portion 802 are connected at an angle, and one end of the first connection portion 801 and one end of the second connection portion 802 intersect at an angle and are fixedly connected. The first connection portion 801 may be formed by bending an extension of the second connection portion 802 at an angle. The first connection portion 801 and the second connection portion 802 are made of a conductive material, and for example, copper, iron, an aluminum alloy, or the like may be used. In terms of manufacturing process, the first connection portion 801 and the second connection portion 802 may be manufactured by integral molding. For example, the same material may be used for casting molding in a mold. Or a plate-shaped structure can be manufactured firstly and then a part of the plate-shaped structure is bent at a certain angle to form the plate-shaped structure.

The thicknesses of the first connection portion 801 and the second connection portion 802 need to be set according to the magnitude of the current and the internal space of the case 20. The occupied space of the connecting piece 8 is reduced while the current flowing area is ensured, and the energy density of the single battery 7 is ensured.

The fusing part 804 is a current protection component on the connecting part 8, the fusing part 804 is a weak part on the second connecting part 802, and can be automatically fused when the current exceeds a safety threshold while ensuring the stable connection between the body 803 and the first connecting part 801 and the stable normal current.

In the technical scheme of the embodiment of the application, the first connecting portion 801 is connected with the end cover 30, the second connecting portion 802 is connected with the tab, the current of the tab is conducted to the end cover 30, and the fusing portion 804 is arranged to be fused when the current flowing through the connecting member 8 exceeds the safety current, so that the safety of the electrode assembly is ensured. In addition, the first connecting portion 801 is connected with the second connecting portion 802 at an angle, and the fusing portion 804 is arranged on the second connecting portion 802, so that the fusing portion 804 can be arranged corresponding to the end portion of the electrode assembly, damage to an isolation film on the electrode assembly due to high temperature during fusing is avoided, and the probability of short circuit caused by fusing aging is reduced.

In some embodiments of the present application, the first connection 801 and the second connection 802 are perpendicular to each other. First connecting portion 801 is connected with the end cover, and second connecting portion 802 sets up towards the shell, can better adapt to the electric monomer inner space through setting up to mutually perpendicular between first connecting portion 801 and the second connecting portion 802. The structure can further improve the safety and the installation convenience of the electrode assembly.

In some embodiments of the present application, please refer to fig. 4 and fig. 5 in combination, the fuse portion 804 has a through hole or an opening penetrating along a thickness direction of the second connection portion 802. The cross-sectional area of the fusing part 804 is reduced by providing the through hole or the opening, so that the structure is simple and the manufacturing is convenient.

In some embodiments of the present application, the thickness of the fuse portion 804 is smaller than the thickness of the body 803 or the first connection portion 801. The thickness of the fuse portion 804 is reduced to reduce the cross-sectional area of the fuse portion 804. The normal current conduction on the fusing part 804 can be ensured, the stable connection between the local part and the first connecting part 801 is ensured, the manufacturing is simple and convenient, and the practicability is high.

In some embodiments of the present application, as shown in FIG. 6, the connector 8 further includes a protective sleeve 805, the protective sleeve 805 being disposed around the fuse 804. The protective sheath is made of an insulating material, and the protective sheath itself has a certain heat insulating property, thereby further preventing damage to the electrode assembly due to a high fusing temperature. By arranging the protective sleeve 805 to wrap the fusing part 804, the electrode assembly is prevented from being damaged by high temperature in the fusing process, and safety performance is improved.

In some embodiments of the present application, as shown in fig. 7, the protecting jacket 805 further includes an extending portion 806 extending and bent toward the first connecting portion 801, and the extending portion 806 surrounds at least a portion of the first connecting portion 801. The extension 806 wraps around the first connection portion 801, so that two ends of the protective sleeve 805 are connected to the first connection portion 801 and the second connection portion 802 at the same time. When the fusing portion 804 is fused, the body 803 and the first connecting portion 801 are broken. The body 803 falls directly along the gap between the case 20 and the electrode assembly. By providing the extension 806, the body 803 is connected to the first connection portion 801, so that the body 803 is prevented from being displaced, and the safety of the battery 2 can be further improved. In the above technical scheme, by providing the extension 806, the connection stability of the protective sleeve and the first connection portion 801 is improved, and the safety performance is improved.

In some embodiments of the present application, the second connection portion 802 further includes a welding connection sheet 807 connected to an edge of the body 803, the welding connection sheet 807 is disposed at an end of the fusing portion 804 away from the first connection portion 801, and the welding connection sheet 807 is used for connecting tabs of an electrode assembly. The welding connection piece 807 is a flat conductor, which is convenient for welding the tab. And can also be easily bent to accommodate the space within the housing 5 after welding. By arranging the welding connecting sheet 807, the area of the connection between the tab and the second connecting part 802 is increased, and the welding efficiency is improved, so that the current flowing area of the second connecting part 802 is increased.

In some embodiments of the present application, the number of the welding connection pieces 807 is two, and the two welding connection pieces 807 are oppositely disposed on two sides of the body 803. The stress on the two sides of the body 803 can be balanced by the structure, so that the stability of the connecting sheet structure is improved, and the single safety performance of the battery is ensured.

In some embodiments of the present application, the connecting tab further comprises an insulator disposed around the body 803. One side of the welding connection piece 807 is connected with the body 803, and the other side passes through the insulating piece and is bent and extended along the thickness direction of the body 803. By providing the insulating member, the connection piece is insulated from the case 5 of the battery cell. Meanwhile, the connecting piece 8 is prevented from being damaged by metal chips generated by ultrasonic welding of the lug and the welding connecting piece 807, and the connecting piece is protected.

In some embodiments of the present application, the first connection portion 801 is provided with a pole connection hole 808. The end cap 30 is connected to an external electric device or a charging device by providing a post terminal. The electrode terminal 25 is connected to the first connection portion 801 of the connection member 8. Since the electrode terminal 25 is generally provided as a cylindrical body, the electrode post connection hole 808 is provided to be matched in shape with the electrode terminal, thereby improving the mounting efficiency and the connection stability. By means of the structure, the connection of the connecting piece 8 and the pole terminal of the end cover 30 is achieved, and the stability of current and the installation efficiency of the connecting piece 8 are improved.

In some embodiments of the present application, as shown in fig. 7, the minimum distance H of the fusing part 804 from the first connection part 801 and the minimum thickness D of the first connection part 801 satisfy the relationship: h is more than or equal to 3D. Through setting up fusing portion 804 in reasonable position, when guaranteeing that fusing function is normal, prevent fusing portion 804 from causing the damage to motor element's barrier film.

In some alternative embodiments, the minimum distance of the fuse 804 from the weld tab 807 is L. The value range of L is as follows: l is more than or equal to 4.8mm. The distance from the fusing part 804 to the welding connection piece 807 is too small, which may cause the tab to overlap with the fusing part 804 after fusing, and cause the tab to short-circuit with the first connection part 801. Through setting up reasonable distance, can guarantee the normal of fusing, guarantee the free security of battery.

The embodiment of the present application further provides a battery cell 7, please refer to fig. 3 and fig. 8 in combination, in which the battery cell 7 includes a connecting member 8, an end cap 30, a housing 5, and an electrode assembly 11. The end cap 30 is connected to the first connection portion 801. The housing 5 has a receiving cavity and an opening 21, and the end cap 30 covers the opening 21. The electrode assembly 11 is disposed in the receiving cavity, and the tabs 12 of the electrode assembly 11 are connected with the body 803. In the above structure, the second connection portion 802 is disposed at one side of the end cap 30 and connected to the tab 12, so that the high temperature of the fusing process at the second connection portion 802 is prevented from damaging the separator of the wound portion of the electrode assembly 11, and the electrode assembly 11 is prevented from being short-circuited.

In some embodiments of the present application, the case 5 includes a bottom wall 201, two oppositely disposed first side walls, and two oppositely disposed second side walls, the bottom wall 201 being disposed opposite to the end cap 30, the first side walls having an area smaller than that of the second side walls, wherein the second connection portion 802 of the connection member 8 is disposed between the first side walls and the electrode assembly 11. With the above structure, the number of turns of winding of the electrode assembly 11 can be increased as much as possible while securing the installation space of the connection member 8.

In some embodiments of the present application, the electrode assembly 11 includes a positive electrode tab, a separator, and a negative electrode tab that are stacked, and the positive electrode tab, the separator, and the negative electrode tab are wound around a first axis that is arranged in a thickness direction of the first side wall. The arrangement mode increases the maximum number of winding turns of the electrode assembly 11 as much as possible, improves the space utilization rate of the shell 5, and effectively improves the energy density of the battery monomer 7.

In some embodiments of the present application, the battery cell 7 further includes a protective layer 40 disposed around the electrode assembly 11. The protective layer 40 can be made of an insulating material, and the protective layer 40 wraps the electrode assembly 11 before the electrode assembly 11 enters the shell 20, so that damage caused by friction between the electrode assembly 11 and the shell 20 is prevented, the integrity of the electrode assembly 11 is effectively improved, and the yield of production of the battery monomer 7 is ensured.

The embodiment of the application also provides a battery 2 which comprises the battery cell 7 in the embodiment. The embodiment of the present application further provides an electric device, where the electric device includes the battery 2 in the above embodiment, and the battery 2 is used to provide electric energy.

Since the battery 2 and the electric device include the connector 8 of the above embodiment, the connector 8 is provided with the first connecting portion 801 connected to the end cap 30, the second connecting portion 802 connected to the tab 12 to conduct the current of the tab 12 to the end cap 30, and the fusing portion 804 is provided to fuse when the current flowing through the connector 8 exceeds the safety current, so as to ensure the safety of the electrode assembly 11. Furthermore, the first connecting portion 801 and the second connecting portion 802 are connected at an angle, and the fusing portion 804 is disposed on the second connecting portion 802, so that the fusing portion 804 can be disposed corresponding to the end portion of the electrode assembly 11, thereby preventing the insulating film on the electrode assembly 11 from being damaged by high temperature during fusing, and reducing the probability of short circuit caused by fusing aging. Therefore, the battery 2 and the electric device provided by the embodiment of the present application can achieve the above technical effects.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (16)

1. A connector (8) for directing electrical current of an electrode assembly (11) to an end cap (30), the connector (8) comprising:

a first connection section (801) connected to the end cap (30);

and a second connection part (802) connected to the first connection part (801) at an angle, wherein the second connection part (802) includes a body (803) and a fusing part (804), the body (803) is connected to a tab (12) of the electrode assembly (11), two ends of the fusing part (804) are connected to the body (803) and the first connection part (801), respectively, and a cross-sectional area of the fusing part (804) is smaller than a cross-sectional area of the body (803).

2. The connecting element (8) according to claim 1, characterized in that said first connecting portion (801) and said second connecting portion (802) are perpendicular to each other.

3. The connecting element (8) according to claim 1, wherein the fusing portion (804) has a through hole or an opening penetrating in a thickness direction of the second connecting portion (802).

4. The connection piece (8) according to claim 1, wherein the thickness of the fusing portion (804) is smaller than the thickness of the body (803) or the first connection portion (801).

5. The connection piece (8) according to any of claims 1 to 4, wherein said connection piece (8) further comprises a protective sleeve (805), said protective sleeve (805) being arranged around said fuse portion (804).

6. The connecting element (8) according to claim 5, wherein the protective sleeve (805) further comprises an extension (806) extending in the direction of the first connection portion (801) and bent, wherein the extension (806) surrounds at least a part of the first connection portion (801).

7. The connecting member (8) according to claim 6, wherein the second connecting portion (802) further comprises a welding connecting piece (807) connected to an edge of the body (803), the welding connecting piece (807) being provided at an end of the fusing portion (804) away from the first connecting portion (801), the welding connecting piece (807) being used for connecting a tab (12) of an electrode assembly (11).

8. The connecting piece (8) according to claim 7, wherein the number of the welding connecting pieces (807) is two, and the two welding connecting pieces (807) are oppositely arranged on two sides of the body (803).

9. The connector (8) of any of claims 6 to 8, wherein the connecting tab further comprises an insulator disposed around the body (803).

10. The connection piece (8) according to any one of claims 6 to 8, wherein the first connection portion (801) is provided with a pole connection hole (808).

11. The connection piece (8) according to claim 10, wherein the minimum distance H of the fusing portion (804) from the first connection portion (801) and the minimum thickness D of the first connection portion (801) satisfy the relationship: h is more than or equal to 3D.

12. A battery cell (7), characterized by comprising:

the connection piece (8) according to any one of claims 1 to 11;

an end cap (30) connected to the first connection portion (801);

a housing (5) having a housing chamber and an opening (21), the end cap (30) covering the opening (21);

and the electrode assembly (11) is arranged in the accommodating cavity, and a tab (12) of the electrode assembly (11) is connected with the body (803).

13. The battery cell (7) according to claim 12, wherein the housing (5) comprises a bottom wall (201), two oppositely arranged first side walls and two oppositely arranged second side walls, the bottom wall (201) being arranged opposite to the end cap (30), the area of the first side walls being smaller than the area of the second side walls, wherein the second connection portion (802) of the connection member (8) is provided between the first side walls and the electrode assembly (11).

14. The battery cell (7) according to claim 13, wherein the electrode assembly (11) includes a positive electrode tab, a separator, and a negative electrode tab arranged in a stack, the positive electrode tab, the separator, and the negative electrode tab being wound around a first axis, the first axis being arranged in a thickness direction of the first side wall.

15. A battery (2), characterized by comprising a battery cell (7) according to any one of claims 12 to 14.

16. An electric consumer, characterized in that the consumer comprises a battery (2) according to claim 15, the battery (2) being adapted to provide electric energy.

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