CN216389640U

CN216389640U - Battery monomer, battery and consumer

Info

Publication number: CN216389640U
Application number: CN202122942825.3U
Authority: CN
Inventors: 吴益扬; 叶永煌; 武宝珍; 王育文; 陈新祥
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-04-26
Anticipated expiration: 2031-11-26
Also published as: CN116745970A; WO2023092849A1

Abstract

The embodiment of the application provides a battery monomer, battery and consumer, and the battery monomer includes shell, electrode subassembly, insulating heat-conducting member. The housing has a receiving cavity. The electrode assembly is located in the accommodation chamber, and the electrode assembly includes a first pole piece including a first active material portion and a first inactive material portion extending from an end of the first active material portion in a first direction toward a wall portion of the case, the first direction being a thickness direction of the wall portion. The insulating heat-conducting member is at least partially arranged between the first inactive substance part and the wall part so as to realize heat conduction between the first inactive substance part and the wall part and improve the heat dissipation efficiency of the battery.

Description

Battery monomer, battery and consumer

Technical Field

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

Background

The battery may include a cadmium nickel battery, a hydrogen nickel battery, a lithium ion battery, a secondary alkaline zinc manganese battery, etc. At present, a lithium ion battery is generally used as a battery which is used for vehicles, and the lithium ion battery as a rechargeable battery has the advantages of small volume, high energy density, high power density, more recycling times, long storage time and the like.

The battery includes an electrode assembly, which generates heat during use to increase the internal temperature of the battery, and when the temperature of the battery is too high, the amount of generated gas of the battery increases, the internal pressure increases, and the separator may be deformed, resulting in short circuits and safety problems.

Therefore, how to increase the heat dissipation speed of the battery and reduce the risk of over-high temperature of the battery becomes a problem to be solved urgently.

Disclosure of Invention

The application provides a battery monomer, battery, consumer can improve the radiating rate of battery, reduces the too high risk of battery temperature.

In a first aspect, the present application provides a battery cell comprising a housing, an electrode assembly, and an insulating thermally conductive member. The housing has a receiving cavity. The electrode assembly is located in the accommodation chamber, and the electrode assembly includes a first pole piece including a first active material portion and a first inactive material portion extending from an end of the first active material portion in a first direction toward a wall portion of the case, the first direction being a thickness direction of the wall portion. The insulating heat-conducting member is at least partially disposed between the first inactive material portion and the wall portion to achieve heat conduction between the first inactive material portion and the wall portion.

According to the embodiment of the application, the first inactive material part extends from the end part of the first active material part towards the wall part along the thickness direction of the wall part, and the insulating heat conducting member is at least partially positioned between the first inactive material part and the wall part, so that the heat of the electrode assembly can be conducted to the shell through the first inactive material part and the insulating heat conducting member, a heat transfer path is established, and the heat dissipation speed and the safety performance of the battery cell are improved.

In some embodiments, a side surface of the insulating heat conductive member facing the electrode assembly is attached to the first inactive material portion, and a side surface of the insulating heat conductive member facing away from the electrode assembly is attached to the wall portion.

According to the embodiment of the present application, the first inactive material portion and the wall portion are both attached to the insulating heat conductive member such that the first inactive material portion and the wall portion are both in contact with the insulating heat conductive member, further increasing the heat dissipation speed of the battery cell.

In some embodiments, the free end of the first inactive material portion abuts against a side surface of the insulating heat conductive member facing the electrode assembly.

According to the embodiment of the present application, the free end forms the contact end face abutting against the insulating heat conductive member, so that the heat of the electrode assembly can be directly conducted to the case through the first inactive material portion and the insulating heat conductive member, while reducing the required size of the first inactive material portion in the thickness direction of the wall portion.

In some embodiments, the first inactive material portion includes a first connection portion connected to the first active material portion and extending from an end of the first active material portion toward the wall portion in the first direction, and a second connection portion bent with respect to the first connection portion and attached to the insulating heat conductive member facing a surface of the insulating heat conductive member.

According to the embodiment of the application, the second connecting part of the first inactive substance part is bent relative to the first connecting part, and the surface of the second connecting part facing the insulating heat conducting member is attached to the insulating heat conducting member, so that the contact area of the first inactive substance part and the insulating heat conducting member is increased, and the heat dissipation speed of the battery cell is further increased.

In some embodiments, the support member is bent and arranged inside the first connecting portion and/or the second connecting portion.

According to the embodiment of the application, the supporting piece is arranged on the inner side of the first connecting part and/or the second connecting part, so that the first inactive material part is supported, and the risk of short circuit caused by the fact that the first inactive material part is inserted into the electrode assembly after being bent is reduced.

In some embodiments, two electrode assemblies are disposed side by side, the two electrode assemblies including a first electrode assembly and a second electrode assembly, the first inactive material portion of the first electrode assembly and the first inactive material portion of the second electrode assembly extending in a direction approaching each other or in a direction away from each other.

According to the embodiment of the application, the first inactive material part of the first electrode assembly and the first inactive material part of the second electrode assembly extend towards the direction close to each other or the direction far away from each other, so that the space occupied by the first inactive material part is reduced, and the loss of the energy density of the battery cell is reduced.

In some embodiments, the first electrode assembly and the second electrode assembly each include a first portion and a second portion, the first inactive material portion extends from the first active material portion of the first portion in the first direction toward the wall portion of the case, and the first electrode assembly first portion and the first portion of the second electrode assembly are disposed adjacent to each other.

According to the embodiment of the present application, the first portion of the first electrode assembly and the first portion of the second electrode assembly are adjacently disposed, and the first inactive material part extends from the first active material part of the first portion toward the wall part of the case in the first direction, so that heat of the side of the electrode assembly away from the case can be conducted to the case through the first inactive material part and the insulating heat conductive member, thereby improving the problem that the central region of the battery cell is difficult to dissipate heat.

In some embodiments, the electrode assembly includes an electrode lead-out and a second pole piece. The electrode leading-out part is arranged on the shell and used for inputting or outputting electric energy. The first pole piece further comprises a second inactive material part which is used for being electrically connected with the electrode leading-out part. The polarity of the second pole piece is opposite to that of the first pole piece, the second pole piece comprises a second active material part and a third inactive material part, the first active material part and the second active material part are overlapped to form a main body part, the second inactive material part and the third inactive material part are located on one side of the main body part, and the first inactive material part is located on the other side of the main body part in the first direction.

In some embodiments, the electrode assembly includes a separator at least partially between the first active material portion and the second active material portion, the first inactive material portion extending beyond the separator in the first direction.

According to the embodiment of the application, the diaphragm is at least partially positioned between the first active material part and the second active material part, so that the first pole piece and the second pole piece are insulated, and the risk of short circuit of the electrode assembly is reduced; the first inactive substance portion extends beyond the diaphragm in the first direction such that the first inactive substance is capable of breaking through the barrier of the diaphragm and transferring heat to the housing through the insulating heat-conducting member.

In some embodiments, the first inactive material part does not exceed the separator of the outermost layer of the electrode assembly in the second direction, which is perpendicular to the first direction.

According to the embodiment of the present application, the first inactive material part does not exceed the side of the electrode assembly, reducing the risk of the first inactive material part overlapping the case, resulting in a short circuit.

In some embodiments, the first pole piece, the separator, and the second pole piece are wound in a winding direction to form an electrode assembly, the electrode assembly including a straight region and a bent region, the first inactive material region being located in the straight region.

According to the embodiment of the application, in the electrode assembly formed by winding, the first inactive material part is located in the straight area, and the bending difficulty of the first inactive material part is reduced.

In some embodiments, the insulating thermally conductive member has a thermal conductivity greater than a thermal conductivity of the diaphragm.

According to the embodiment of the application, the thermal conductivity of the insulating and heat-conducting member is greater than that of the diaphragm, so that the insulating and heat-conducting member can conduct heat more effectively and more quickly relative to the diaphragm.

In some embodiments, the housing includes a casing body and an end cover, the casing body includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, one end of the side wall is connected with the bottom wall, the other end of the side wall encloses an opening opposite to the bottom wall, the end cover covers the opening, and the wall portion is the bottom wall.

In a second aspect, the present application provides a battery including the battery cell provided in the first aspect of the present application.

In a third aspect, the present application provides a powered device comprising the battery provided in the second aspect of the present application.

The application provides a battery monomer, battery and consumer, battery monomer include shell, electrode subassembly, insulating heat-conducting piece. The housing has a receiving cavity. The electrode assembly is located in the accommodation chamber, and the electrode assembly includes a first pole piece including a first active material portion and a first inactive material portion extending from an end of the first active material portion in a first direction toward a wall portion of the case, the first direction being a thickness direction of the wall portion. The insulating heat-conducting member is at least partially arranged between the first inactive substance part and the wall part to realize heat conduction between the first inactive substance part and the wall part, so that the heat dissipation speed of the battery is improved, and the risk of overhigh temperature of the battery is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

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

FIG. 2 is a schematic diagram of a cell according to some embodiments of the present disclosure;

fig. 3 is a schematic structural view of a battery module according to some embodiments of the present disclosure;

fig. 4 is an exploded view of a battery cell disclosed in some embodiments of the present application;

fig. 5 is a cross-sectional view of a battery cell disclosed in some embodiments of the present application;

fig. 6 is a cross-sectional view of a battery cell as disclosed in other embodiments of the present application;

fig. 7 is a cross-sectional view of a battery cell disclosed in further embodiments of the present application;

FIG. 8 is a schematic view of an electrode assembly disclosed in some embodiments herein;

FIG. 9 is a schematic illustration of a housing disclosed in some embodiments of the present application;

in the drawings, the drawings are not necessarily to scale.

Description of the labeling: 10-a box body; 11-a first part; 12-a second part; 20-a battery module; 30-a battery cell; 31-a housing; 311-a housing; 3111-wall section; 3111 a-bottom wall; 3111 b-side walls; 3112-opening; 312-end cap; 32-a containment chamber; 33-an electrode lead-out portion; 40-an electrode assembly; 401-a first part; 402-a second portion; 40 a-a first electrode assembly; 40 b-a second electrode assembly; 41-a first pole piece; 411-first active material portion; 412-first inactive material portion; 412a — first connection; 412 b-a second connection; 413-a second inactive material part; 50-an insulating thermally conductive member; 60-a support member; 42-a second pole piece; 421-second active material portion; 422-a third inactive material portion; 44-a membrane; 45-straight zone; 46-a bending zone; 100-a battery; 1000-a vehicle; x-a first direction; y-a second direction; z-the winding 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 foregoing 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.

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 illustrative 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 a packaging manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is also not limited to this.

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 a diaphragm. 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 pole current collector and a positive pole active substance layer, wherein the positive pole active substance layer is coated on the surface of the positive pole current collector, the positive pole current collector which is not coated with the positive pole active substance layer protrudes out of the positive pole current collector which is coated with the positive pole active substance layer, and the positive pole current collector which is not coated with the positive pole active substance layer is used as a positive pole lug. 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 collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current can be passed through without fusing, a plurality of positive electrode tabs are stacked together, and a plurality of negative electrode tabs are stacked together. The base film material of the separator may be PP (polypropylene) or PE (polyethylene).

In the charging or discharging process of the battery, chemical reaction can occur inside the battery monomer, so that a large amount of heat energy is generated, if the battery monomer cannot dissipate heat in time, the internal temperature of the battery monomer can be too high, the gas generation of the battery monomer is increased, the internal pressure is increased, and even the diaphragm can be deformed, so that short circuit is caused, and safety problems are caused.

However, in order to isolate the positive electrode plate from the negative electrode plate, in the electrode assembly, the diaphragm usually exceeds the positive electrode plate in the width direction and the length direction of the positive electrode plate, and because the thermal conductivity of the diaphragm is low, the heat inside the electrode assembly is difficult to break through the barrier of the diaphragm, and is quickly led out of the battery cell through the shell of the battery cell.

The inventor finds that the current collector of the positive pole piece and the current collector of the negative pole piece have good heat conducting performance, and in view of the above, the application provides a battery cell, wherein the current collector of the positive pole piece or the current collector of the negative pole piece extends along the direction close to the wall part of the shell to exceed the diaphragm by a certain size, and an insulating heat conducting piece is arranged between the extended current collector and the wall part of the shell, so that the heat radiating performance of the battery cell is improved, and meanwhile, the insulation between the shell and the electrode assembly is kept.

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 particularly limit the above 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 the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, and for example, the battery 100 may serve as an operation power source of the vehicle 1000.

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 30, and the case 10 is used for accommodating the battery cell 30.

The case 10 is a part for accommodating the battery cell 30, the case 10 provides an accommodating space for the battery cell 30, and the case 10 may have various structures. In some embodiments, 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 space for receiving the battery cell 30. 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 be a hollow structure with one side open, and the open side of the second portion 12 is closed to the open side of the first portion 11, thereby forming the case 10 having the receiving space. 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 receiving space. 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 30 may be provided. If there are a plurality of battery cells 30, the plurality of battery cells 30 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 30 are connected in series or in parallel. The plurality of battery cells 30 may be connected in series, in parallel, or in series-parallel to form the battery module 20, and the plurality of battery modules 20 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 30 may be directly connected in series or in parallel or in series-parallel, and the whole of all the battery cells 30 is accommodated in the case 10.

In some embodiments, the battery 100 may further include a bus member, and the plurality of battery cells 30 may be electrically connected to each other through the bus member, so as to connect the plurality of battery cells 30 in series, 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, fig. 3 is a schematic structural view of a battery module 20 disclosed in some embodiments of the present application, where the battery module 20 includes a battery cell 30. One or more battery cells 30 may be provided.

Referring to fig. 4 and 5, fig. 4 is an exploded view of a battery cell 30 disclosed in some embodiments of the present application, and fig. 5 is a sectional view of the battery cell 30 disclosed in some embodiments of the present application. The battery cell 30 includes a case 31, an electrode assembly 40, and an insulating heat conductive member 50. The housing 31 has a receiving cavity 32. The electrode assembly 40 is located in the accommodation cavity 32, the electrode assembly 40 includes a first pole piece 41, the first pole piece 41 includes a first active material portion 411 and a first inactive material portion 412, the first inactive material portion 412 extends from an end portion of the first active material portion 411 toward a wall portion 3111 of the case 31 in a first direction X, which is a thickness direction of the wall portion 3111. The insulating heat-conductive member 50 is at least partially provided between the first inactive material portion 412 and the wall portion 3111 to achieve heat conduction between the first inactive material portion 412 and the wall portion 3111.

The housing 31 may include the end cap 312 and the shell 311, or may be a unitary structure. The housing 31 may be made of metal, such as copper, iron, aluminum, stainless steel, aluminum alloy, or other non-metallic materials, such as plastic, or other composite materials. The housing 31 may be made of the same material as a whole, or may be made of a plurality of materials. The housing 31 may be various shapes such as a rectangular parallelepiped, a cylinder, a cube, etc. The housing 31 may be formed by extrusion, drawing, casting, or stamping.

The housing 31 has a receiving cavity 32, and the receiving cavity 32 may be various shapes such as a rectangular parallelepiped, a cylinder, a cube, and the like. Alternatively, the shape of the housing 31 and the shape of the accommodating chamber 32 correspond, for example, when the housing 31 is a rectangular parallelepiped, the accommodating chamber 32 is a rectangular parallelepiped. Optionally, the receiving cavity 32 is normally kept closed.

The electrode assembly 40 may be wound, stacked, or rolled. The electrode assembly 40 is composed of a positive electrode tab, a negative electrode tab, and a separator 44. The number of the electrode assemblies 40 may be one or more. Alternatively, a plurality of electrode assemblies 40 are arranged side by side and received in the receiving cavity 32. The positive pole piece comprises a positive pole current collector and a positive pole active substance, wherein the positive pole current collector can be made of aluminum, and the positive pole active substance can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate and the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance, wherein the negative pole current collector can be made of copper, and the negative pole active substance can be made of carbon or silicon and the like. The base film material of the diaphragm 44 may be PP (polypropylene) or PE (polyethylene).

The first pole piece 41 may be a positive pole piece or a negative pole piece, and the application is not particularly limited, and for example, the first pole piece 41 is taken as a negative pole piece as an example below. The first pole piece 41 includes a first active material portion 411 coated with an active material and an empty foil area not coated with an active material, the empty foil area including a first inactive material portion 412. The first inactive material part 412 may be integrated with or separated from the current collector of the first active material part 411. Alternatively, the first inactive material part 412 and the current collector of the first active material part 411 are integrated.

The first inactive material portion 412 extends from an end portion of the first active material portion 411 toward a wall portion 3111 of the housing 31 in a thickness direction of the wall portion 3111, and the wall portion 3111 may be a side wall and/or a bottom wall of the housing 31, for example, referring to fig. 5, the wall portion 3111 is the bottom wall of the housing 31.

The insulating and heat-conducting member 50 may be a metal material such as aluminum or stainless steel, or an insulating material such as plastic or silicone, the surface of which is subjected to an insulating treatment. Optionally, the thermal conductivity of the insulating and heat-conducting member 50 is greater than 2W/(m · K). Alternatively, the insulating and heat-conducting member 50 has a plate-like structure.

The heat conduction may occur in any of solid, liquid, and gas, and the heat conduction may be performed by direct contact heat transfer of the first inactive material portion 412, the insulating heat-conductive member 50, and the wall portion 3111, or by heat transfer of another medium such as an electrolyte.

According to the embodiment of the present application, the first inactive material part 412 extends from the end of the first active material part 411 toward the wall part 3111 in the thickness direction of the wall part 3111, and the insulating heat conductive member 50 is at least partially located between the first inactive material part 412 and the wall part 3111, so that heat of the electrode assembly 40 can be conducted to the case 31 through the first inactive material part 412 and the insulating heat conductive member 50, a heat transfer path is established, and the heat dissipation speed and safety of the battery cell 30 are improved.

Referring to fig. 4 and 5, a side surface of the insulating thermal conductor 50 facing the electrode assembly 40 is attached to the first inactive material portion 412, and a side surface of the insulating thermal conductor 50 facing away from the electrode assembly 40 is attached to the wall portion 3111.

The attachment means that a side surface of the insulating heat conductive member 50 facing the electrode assembly 40 is in contact with the first inactive material portion 412, and a side surface of the insulating heat conductive member 50 facing away from the electrode assembly 40 is in contact with the wall portion 3111. The insulating and heat conducting member 50 may be attached to the first inactive material portion 412 in the same manner as or different from the insulating and heat conducting member 50 to the wall portion 3111, and the present application is not limited thereto.

According to the embodiment of the present application, the first inactive material portion 412 and the wall portion 3111 are attached to the insulating heat conductive member 50 such that the first inactive material portion 412 and the wall portion 3111 are in contact with the insulating heat conductive member 50, further increasing the heat dissipation speed of the battery cell 30.

Referring to fig. 5, the free end of the first inactive material part 412 abuts against a side surface of the insulating heat conductive member 50 facing the electrode assembly 40.

The free end of the first inactive material portion 412 refers to the end of the first inactive material portion 412 opposite to the end where the first active material portion 411 is connected.

The free end of the first inactive material portion 412 is in contact with the surface of the insulating heat conductive member 50 facing the electrode assembly 40, and abuts against the surface of the insulating heat conductive member 50 facing the electrode assembly 40. The abutment may be achieved by means of bonding, riveting, welding, or the like, or may be achieved by direct contact. Alternatively, the electrode assembly 40 abuts the first inactive material part 412 against the surface of the insulating heat conductive member 50 by its own weight.

Alternatively, when the electrode assembly has a winding structure, the first inactive material part 412 is continuous in the winding direction, and both ends of the first inactive material part 412 are folded toward the middle in the length direction of the insulating heat conductive member 50.

According to the embodiment of the present application, the free end forms the contact end face to abut against the insulating heat conductive member 50, so that the heat of the electrode assembly 40 can be directly conducted to the case 31 through the first inactive substance part 412, the insulating heat conductive member 50, while reducing the required dimension of the first inactive substance part 412 in the thickness direction of the wall part 3111.

Referring to fig. 6, fig. 6 is a cross-sectional view of a battery cell disclosed in other embodiments of the present application, the first inactive material portion 412 includes a first connection portion 412a and a second connection portion 412b, the first connection portion 412a is connected to the first active material portion 411 and extends from an end of the first active material portion 411 toward the wall portion 3111 along the first direction X, the second connection portion 412b is bent with respect to the first connection portion 412a, and a surface of the second connection portion 412b facing the insulating and heat conducting member 50 is attached to the insulating and heat conducting member 50.

The first connection portion 412a is connected to the first active material portion 411, the second connection portion 412b is connected to the first connection portion 412a, and the second connection portion 412b is bent with respect to the first connection portion 412a, so that the first inactive material portion 412 is integrally bent and disposed between the first active material portion 411 and the insulating heat conductive member 50.

According to the embodiment of the present application, the second connecting portion 412b of the first inactive material portion 412 is bent with respect to the first connecting portion 412a, and the surface of the second connecting portion 412b facing the insulating and heat-conducting member 50 is attached to the insulating and heat-conducting member 50, so that the contact area between the first inactive material portion 412 and the insulating and heat-conducting member 50 is increased, thereby further increasing the heat dissipation speed of the battery cell 30.

Referring to fig. 6, the battery cell 30 further includes a supporting member 60, and the supporting member 60 is bent and disposed at an inner side of the first connecting portion 412a and/or the second connecting portion 412 b.

The support 60 may be an insulating material, and for example, referring to fig. 6, the support 60 is blue gel. The supporting element 60 is disposed inside the first connecting portion 412a and/or the second connecting portion 412b in a bending manner, and optionally, the supporting element 60 is disposed inside the first connecting portion 412 a. The inner side refers to the side of the first inactive substance part 412 facing away from the housing 31.

According to the embodiment of the present application, the supporting member 60 is disposed at the inner side of the first connection part 412a and/or the second connection part 412b to provide support for the first inactive material part 412, thereby reducing the risk of short circuit caused by the first inactive material part 412 being bent and then inserted into the electrode assembly 40.

Referring to fig. 6, including arranging two electrode assemblies 40 side by side, the two electrode assemblies 40 include a first electrode assembly 40a and a second electrode assembly 40b, and the first inactive material part 412 of the first electrode assembly 40a and the first inactive material part 412 of the second electrode assembly 40b extend in a direction approaching each other or in a direction separating from each other.

The side-by-side arrangement means that the largest area surface of the electrode assembly 40 is in contact with and received in the housing 31 corresponding to the largest area surface of the housing 31.

The first inactive material part 412 of the first electrode assembly 40a and the first inactive material part 412 of the second electrode assembly 40b extend in a direction approaching each other or in a direction away from each other, which means that the first inactive material part of the first electrode assembly 40a may extend in a direction approaching the second electrode assembly 40b or in a direction away from the second electrode assembly 40b, and meanwhile, the inactive material part of the second electrode assembly 40b may extend in a direction approaching the first electrode assembly 40a or in a direction away from the first electrode assembly 40a, that is, the extending directions of the first inactive material parts 412 of the two electrode assemblies 40 may be the same or opposite.

According to the embodiment of the present application, the first inactive material part 412 of the first electrode assembly 40a and the first inactive material part 412 of the second electrode assembly 40b extend in a direction approaching each other or in a direction separating from each other, the space occupied by the first inactive material part 412 is reduced, and the loss of the energy density of the battery cell 30 is reduced.

Referring to fig. 7, fig. 7 is a cross-sectional view of a battery cell 30 disclosed in further embodiments of the present application, the first electrode assembly 40a and the second electrode assembly 40b each include a first portion 401 and a second portion 402, the first inactive material part 412 extends from the first active material part 411 of the first portion 401 toward the wall portion 3111 of the case 31 in the first direction X, and the first portion 401 of the first electrode assembly 40a and the first portion 401 of the second electrode assembly 40b are adjacently disposed.

The first portion 401 is farther from the case 31 than the second portion 402 in the length direction of the insulating and heat-conducting member 50.

According to the embodiment of the present application, the first portion 401 of the first electrode assembly 40a and the first portion 401 of the second electrode assembly 40b are adjacently disposed, and the first inactive material part 412 extends from the first active material part 411 of the first portion 401 toward the wall part 3111 of the case 31 in the first direction X, so that heat of the side of the electrode assembly 40 away from the case 31 can be conducted to the case 31 through the first inactive material part 412 and the insulating heat conductor 50, thereby improving the problem that it is difficult for the central region of the battery cell 30 to dissipate heat.

Referring to fig. 4 and 5, the electrode assembly 40 includes an electrode lead-out portion 33 and a second electrode tab 42. The electrode lead-out portion 33 is provided in the case 31 and is used for inputting or outputting electric energy. The first pole piece 41 further includes a second inactive material portion 413, and the second inactive material portion 413 is used to electrically connect the electrode lead portion 33. The second pole piece 42 is opposite in polarity to the first pole piece 41, the second pole piece 42 includes a second active material portion 421 and a third inactive material portion 422, the first active material portion 411 and the second active material portion 421 are overlapped to form a main body portion, the second inactive material portion 413 and the third inactive material portion 422 are located on one side of the main body portion, and the first inactive material portion 412 is located on the other side of the main body portion in the first direction X.

The number of the electrode lead-out portions 33 is two, the two electrode lead-out portions 33 are respectively connected to the second inactive material portion 413 and the third inactive material portion 422, and the electrode lead-out portions 33 are conductors at least partially exposed to the outside of the battery cell 30, that is, the battery lead-out portions may be poles mounted on the housing 31 or the housing 31 of the battery cell 30, which is not particularly limited in the present application. The electrode lead-out portion 33 may be made of copper, aluminum alloy, or the like.

The second inactive material portion 413 may be a positive electrode tab or a negative electrode tab, and optionally, when the first electrode sheet 41 is a negative electrode, the second inactive material portion 413 is a negative electrode tab. The polarity of the third inactive material part 422 is opposite to that of the second inactive material part 413, and optionally, when the second inactive material part 413 is a negative electrode tab, the third inactive material part 422 is a positive electrode tab. Optionally, the material of the positive electrode tab is aluminum, and the material of the negative electrode tab is copper.

The second and third

inactive material portions

413 and 422 may be located at the same side, adjacent sides, or opposite sides of the main body portion, respectively.

Alternatively, the second and third

inactive material portions

413 and 422 are located on the same side of the main body portion, and the first inactive material portion 412 is located on the other side of the main body portion. The other side may be an adjacent side or an opposite side.

According to the embodiment of the present application, the second inactive material part 413 and the third inactive material part 422 are respectively connected to the electrode lead-out part 33 so that the electric energy of the battery cell 30 can be transmitted to an external electric device, or an external charging device can store the electric energy in the battery cell 30.

Referring to fig. 5, the electrode assembly 40 includes a separator 44, the separator 44 is at least partially positioned between a first active material portion 411 and a second active material portion 421, and a first inactive material portion 412 extends beyond the separator 44 in the first direction X.

The base film material of the diaphragm 44 may be PP (polypropylene) or PE (polyethylene). At least one surface of the diaphragm 44 may be composited with a protective layer, which may be composed of one or more materials such as ceramic, polyvinylidene fluoride, and the like.

According to the embodiment of the present application, the separator 44 is at least partially located between the first active material portion 411 and the second active material portion 421, so that the first pole piece 41 and the second pole piece 42 are insulated, reducing the risk of short-circuiting of the electrode assembly 40; the first inactive substance portion 412 extends beyond the diaphragm 44 in the first direction X so that the first inactive substance can break through the barrier of the diaphragm 44 and conduct heat to the case 31 through the insulating heat-conductive member 50.

Referring to fig. 5, the first inactive material part 412 does not exceed the separator 44 of the outermost layer of the electrode assembly 40 in the second direction Y, which is perpendicular to the first direction X.

The first inactive material part 412 does not exceed the separator 44 of the outermost layer of the electrode assembly 40, that is, a projection of the first inactive material part 412 is located within a projection of the main body part in the first direction X.

According to the embodiment of the present application, the first inactive material part 412 does not exceed the side of the electrode assembly 40, reducing the risk of the first inactive material part 412 overlapping the case 31, resulting in a short circuit.

Referring to fig. 8, fig. 8 is a schematic view of an electrode assembly 40 disclosed in some embodiments of the present application. The first pole piece 41 (not shown), the separator 44 (not shown), and the second pole piece 42 (not shown) of the electrode assembly 40 are wound in the winding direction Z to form the electrode assembly 40, the electrode assembly 40 includes a flat region 45 and a bent region 46, and the first inactive material portion 412 is located in the flat region 45.

According to the embodiment of the present application, in the electrode assembly 40 formed by winding, the first inactive material portion 412 is located in the flat region 45, reducing the difficulty in bending the first inactive material portion 412.

In some embodiments, the thermal conductivity of the insulating thermal conductor 50 is greater than the thermal conductivity of the diaphragm 44.

Thermal conductivity, i.e., thermal conductivity, is a measure of the thermal conductivity of a substance, and refers to the amount of heat transferred per unit time through a unit horizontal cross-sectional area when the temperature gradient is 1 deg.c/m vertically downward.

According to the embodiment of the present application, the thermal conductivity of the insulating thermal conduction member 50 is greater than that of the diaphragm 44, so that the insulating thermal conduction member 50 can conduct heat more efficiently and more quickly with respect to the diaphragm 44.

In some embodiments, the housing 31 includes a housing 311 and an end cover 312, referring to fig. 9, fig. 9 is a schematic view of the housing disclosed in some embodiments of the present application, the housing 311 includes a bottom wall 3111a and a side wall 3111b, the side wall 3111b is enclosed around the bottom wall 3111a, one end of the side wall 3111b is connected to the bottom wall 3111a, the other end of the side wall 3111b encloses an opening 3112 opposite to the bottom wall 3111a, the end cover 312 (not shown in the figure) covers the opening 3112, and the wall 3111 is the bottom wall 3111a.

In some embodiments, the present application provides a battery cell 30 including a case 31, an electrode assembly 40, and an insulating heat conductive member 50. The housing 31 has a receiving cavity 32. The electrode assembly 40 is located in the accommodation chamber 32, the electrode assembly 40 includes a first pole piece 41, the first pole piece 41 includes a first active material portion 411 and a first inactive material portion 412, and the first inactive material portion 412 extends from an end of the first active material portion 411 toward a wall portion 3111 of the case 31 in a first direction X, which is a thickness direction of the wall portion 3111. The insulating heat-conductive member 50 is at least partially provided between the first inactive material portion 412 and the wall portion 3111 to achieve heat conduction between the first inactive material portion 412 and the wall portion 3111. The first inactive material portion 412 includes a first connection portion 412a and a second connection portion 412b, the first connection portion 412a is connected to the first active material portion 411 and extends from an end of the first active material portion 411 toward the wall portion 3111 in the first direction X, the second connection portion 412b is bent with respect to the first connection portion 412a, and the surface of the second connection portion 412b facing the insulating and heat-conducting member 50 is attached to the insulating and heat-conducting member 50. The battery cell 30 further includes a supporting member 60, and the supporting member 60 is bent and disposed inside the first connecting portion 412a and/or the second connecting portion 412 b. The first electrode assembly 40a and the second electrode assembly 40b each include a first portion 401 and a second portion 402, the first inactive material part 412 extends from the first active material part 411 of the first portion 401 toward the wall part 3111 of the case 31 in the first direction X, and the first portion 401 of the first electrode assembly 40a and the first portion 401 of the second electrode assembly 40b are adjacently disposed. The first pole piece 41 further includes a second inactive material portion 413. The second pole piece 42 is opposite in polarity to the first pole piece 41, the second pole piece 42 includes a second active material portion 421 and a third inactive material portion 422, the first active material portion 411 and the second active material portion 421 are overlapped to form a main body portion, the second inactive material portion 413 and the third inactive material portion 422 are located on one side of the main body portion, and the first inactive material portion 412 is located on the other side of the main body portion in the first direction X. The electrode assembly 40 includes a separator 44, the separator 44 being at least partially located between the first active material portion 411 and the second active material portion 421, and the first inactive material portion 412 being beyond the separator 44 in the first direction X.

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

Claims

1. A battery cell, comprising:

a housing having a receiving cavity;

an electrode assembly located within the receiving cavity, the electrode assembly including a first pole piece including a first active material portion and a first inactive material portion extending from an end of the first active material portion toward a wall portion of the case in a first direction, the first direction being a thickness direction of the wall portion;

and an insulating heat-conducting member at least partially disposed between the first inactive material portion and the wall portion to achieve heat conduction between the first inactive material portion and the wall portion.

2. The battery cell according to claim 1, wherein a side surface of the insulating heat conductive member facing the electrode assembly is attached to the first inactive material portion, and a side surface of the insulating heat conductive member facing away from the electrode assembly is attached to the wall portion.

3. The battery cell according to claim 2, wherein a free end of the first inactive material portion abuts against a side surface of the insulating heat conductive member facing the electrode assembly.

4. The battery cell according to claim 2, wherein the first inactive material portion includes a first connection portion and a second connection portion, the first connection portion is connected to the first active material portion and extends from an end of the first active material portion toward the wall portion in the first direction, the second connection portion is bent with respect to the first connection portion, and a surface of the second connection portion facing the insulating heat conductive member is attached to the insulating heat conductive member.

5. The battery cell according to claim 4, further comprising a support member disposed at an inner side of the first connection portion and/or the second connection portion in a bent manner.

6. The battery cell according to claim 4, comprising two electrode assemblies arranged side by side, wherein the two electrode assemblies comprise a first electrode assembly and a second electrode assembly, and wherein the first inactive material portion of the first electrode assembly and the first inactive material portion of the second electrode assembly extend in a direction toward each other or in a direction away from each other.

7. The battery cell according to claim 3 or 4, wherein the first electrode assembly and the second electrode assembly each include a first portion and a second portion, the first inactive material portion extends from a first active material portion of the first portion toward a wall portion of the case in the first direction, and the first electrode assembly first portion and the second electrode assembly first portion are disposed adjacent to each other.

8. The battery cell of claim 1, wherein the electrode assembly comprises:

an electrode lead-out part arranged on the shell and used for inputting or outputting electric energy;

the first pole piece further comprises a second inactive substance part which is used for being electrically connected with the electrode leading-out part; and

and the second pole piece is opposite to the first pole piece in polarity, the second pole piece comprises a second active material part and a third inactive material part, the first active material part and the second active material part are overlapped to form a main body part, the second inactive material part and the third inactive material part are positioned on one side of the main body part, and the first inactive material part is positioned on the other side of the main body part in the first direction.

9. The battery cell of claim 8, wherein the electrode assembly includes a separator at least partially between the first active material portion and the second active material portion, and wherein the first inactive material portion extends beyond the separator in the first direction.

10. The battery cell according to claim 9, wherein the first inactive material part does not exceed the separator of the outermost layer of the electrode assembly in a second direction perpendicular to the first direction.

11. The battery cell according to claim 10, wherein the first pole piece, the separator, and the second pole piece are wound in a winding direction to form the electrode assembly, the electrode assembly including a flat region and a bent region, the first inactive material region being located in the flat region.

12. The battery cell of claim 1, wherein the insulating thermally conductive member has a thermal conductivity greater than a thermal conductivity of the separator.

13. The battery cell as recited in claim 1 wherein the housing comprises a casing and an end cap, the casing comprising a bottom wall and a side wall, the side wall being disposed around the bottom wall, one end of the side wall being connected to the bottom wall, the other end of the side wall defining an opening opposite the bottom wall, the end cap covering the opening, the wall being the bottom wall.

14. A battery comprising the battery cell of any one of claims 1-13.

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