CN115295972B

CN115295972B - Switching piece, battery monomer, battery and power consumption device

Info

Publication number: CN115295972B
Application number: CN202211169870.2A
Authority: CN
Inventors: 叶伟青; 郭满毅; 李婷
Original assignee: Contemporary Amperex Technology Co Ltd; Jiangsu Contemporary Amperex Technology Ltd
Current assignee: Contemporary Amperex Technology Co Ltd; Jiangsu Contemporary Amperex Technology Ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2022-12-27
Anticipated expiration: 2042-09-26
Also published as: CN115295972A; WO2024066054A1

Abstract

The application relates to the technical field of batteries, and relates to a switching piece, a battery monomer, a battery and an electric device. The fusing part of the adapter sheet is externally coated with a first coating layer and a second coating layer. Because the outer cladding of first cladding layer has the second cladding layer, when the fusing portion fuses, the high temperature that produces in the twinkling of an eye makes first cladding layer can be at the inside deformation by heating of second cladding layer, and the fusing portion parcel after will fusing to reach insulation protection's effect. And the second coating layer wraps up outside the fusing part, not only can provide the effect of fixed stay for the adaptor piece after fusing, alleviates the problem that the adaptor piece of disconnection takes place to reconnect and switches on and then makes the battery inefficacy in the battery use, can also avoid the electrolyte contact fusing part in the battery. Therefore, the use safety performance of the battery is improved.

Description

Switching piece, battery monomer, battery and power consumption device

Technical Field

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

Background

In the related art, electrode terminals in the battery are connected to the cell assembly through the interposer. When the overcurrent current of the battery is overlarge, the switching sheet can cut off the current in a disconnection mode, so that the potential safety hazard caused by the overcharge of the battery is avoided. In the process, the problem that the disconnected adapter sheet is easily reconnected and conducted so as to cause the battery to lose efficacy can occur, and the use safety performance of the battery is influenced.

Disclosure of Invention

In view of the above problems, the application provides an adapter sheet, a single battery, a battery and an electric device, which can alleviate the problem that the adapter sheet disconnected in the use process of the battery is reconnected and conducted to further disable the battery, and improve the use safety performance of the battery.

In a first aspect, the present application provides an interposer for a battery cell, the interposer including: a first connection part for electrically connecting with the electrode terminal; a second connection part for electrically connecting the tab; a fusing part connected between the first connection part and the second connection part; and an insulating coating structure. The insulating coating structure comprises a first coating layer and a second coating layer which are sequentially coated outside the fusing part. Wherein the second coating layer has a melting point greater than that of the first coating layer, the second coating layer being configured to completely coat the first coating layer. When the current flowing through the adapter plate is larger than a preset threshold value, the fusing part is fused by heating, and the first coating layer is deformed by heating.

In the technical scheme of the embodiment of the application, the first coating layer and the second coating layer are coated outside the fusing part of the adapter sheet. Because the first cladding layer is coated with the second cladding layer, when the fusing part fuses, the first cladding layer can be deformed in the second cladding layer by high temperature generated instantly, and the fused part after fusing is coated, so that the effect of insulation protection is achieved. And the second cladding layer parcel not only can provide the effect of fixed stay for the switching piece after fusing outside the fusing, alleviates the switching piece of disconnection and takes place to reconnect and switch on and then make the problem that the battery became invalid in the battery use, can also avoid the electrolyte contact fusing in the battery. Therefore, the use safety performance of the battery is improved.

In some embodiments, a distance between an outer contour of the second cladding layer and an outer contour of the first cladding layer along the arrangement direction of the first connecting portion and the second connecting portion is greater than or equal to 1 mm.

Through the size relation between the outline of the second cladding layer and the outline of the first cladding layer along the direction of arranging of first connecting portion and second connecting portion, on the one hand, when the fusing of fuse portion, the first cladding layer that the second cladding layer can wrap up the thermal deformation plays insulating protection's effect. On the other hand, structural strength can be improved to the second cladding layer, improves the reliability to the fixed support of fusing portion, and when fusing portion fusing, the fusing portion parcel after fusing can be stably with the first cladding layer of thermal deformation.

In some embodiments, a distance between an outer contour of the first cladding layer and an outer contour of the fuse portion along the arrangement direction of the first connection portion and the second connection portion is greater than or equal to 2 mm.

Through the direction of arranging of first connecting portion and second connecting portion, the size relation between the outline of first cladding layer and the outline of fusing portion, be favorable to first cladding layer to wrap up the fusing portion after fusing more, reach insulation protection's effect.

In some embodiments, the interposer has first and second sides opposite in a thickness direction of the interposer; in the thickness direction of the adapter sheet, the ratio of the size of the first coating layer on the first side to the size of the second coating layer on the first side is greater than or equal to 1; in some embodiments, in the thickness direction of the interposer, the ratio of the size of the first cladding layer on the second side to the size of the second cladding layer on the second side is greater than or equal to 1.

Through the definition in the thickness direction of adaptor piece, be located the size of the first cladding layer of the first side of adaptor piece and be located the ratio of the size of the second cladding layer of the first side of adaptor piece, and/or, be located the size of the first cladding layer of the second side of adaptor piece and be located the ratio of the size of the second cladding layer of the second side of adaptor piece, and then make the first cladding layer of second cladding layer parcel completely, further satisfy the parcel nature of second cladding layer to first cladding layer, improve the reliability that the second cladding layer carries out fixed support to first cladding layer.

In some embodiments, the material of the first coating layer comprises at least one of polyethylene, oxidized polyethylene, polyvinyl alcohol based copolymer; in some embodiments, the material of the second cladding layer comprises at least one of a ceramic material, polyimide, and viton.

In this way, through the selection of the material of the first cladding layer, the first cladding layer has low thermal sensitivity, and is convenient to deform and melt into a flowing state when the fusing part is fused, so as to wrap the fused fusing part after fusing. Through the selection of the material of the second coating layer, the second coating layer has the properties of high temperature resistance and insulation, and can play the roles of insulation protection, fixing and supporting the fused part after fusion and wrapping the first coating layer which is fused into a flowing state.

In some embodiments, the first cladding layer has a melting point T1 and the second cladding layer has a melting point T2; the ratio of T2 to T1 is greater than or equal to 3. In this way, by defining the relationship between the melting point of the first cladding layer and the melting point of the second cladding layer, the second cladding layer can better provide a fixing support effect when the first cladding layer is deformed by heat.

In some embodiments, T1 is between 90 ℃ and 130 ℃ and T2 ≧ 600 ℃. So, through the first cladding layer of selecting required melting point, can guarantee the temperature response sensitivity and the mobile parcel nature of first cladding layer, when the fusing of fusing, can wrap up the fusing of fusing fast. Through the second coating layer of the required melting point of selection, can be so that the second coating layer can be high temperature resistant, avoid the high temperature influence that produces when fusing portion fuses, improved the reliability of second coating layer.

In some embodiments, in the thickness direction of the interposer, the size of the fusing part is smaller than the size of the first connecting part and the size of the second connecting part; in some embodiments, in the width direction of the interposer, the dimension of the fusing part is smaller than the dimension of the first connecting part and the dimension of the second connecting part; the width direction of the adapter sheet, the thickness direction of the adapter sheet and the arrangement directions of the first connecting part and the second connecting part are mutually vertical. Through the size design to the fusing part to obtain required overcurrent cross-sectional area at fusing part, be convenient for when producing too big electric current, fusing part can fuse, realizes the protection to the battery.

In some embodiments, the fuse portion is provided with a through hole. Thus, the contact area and the fixed area of the first coating layer and the fusing part can be increased, and the coating effect of the melted first coating layer is further improved.

In some embodiments, the through-holes comprise at least one of circular holes, square holes, diamond holes; in some embodiments, the through holes are provided in plurality, and the plurality of through holes are arranged in a predetermined direction. Therefore, the wrapping effect of the first coating layer subjected to thermal deformation can be further improved through the design of the shape of the through holes and the arrangement mode of the through holes. The selection can be performed according to the actual use situation, and the embodiment of the present application does not specifically limit this.

In some embodiments, the second coating layer has contact areas with the first connection portion and the second connection portion respectively in the arrangement direction of the first connection portion and the second connection portion and in the thickness direction of the interposer. The first connecting part and/or the second connecting part are/is provided with a positioning hole. The second coating layer is matched with the connecting part provided with the positioning hole by virtue of the positioning hole. Therefore, the reliability that the second coating layer is fixed on the first connecting part and/or the second connecting part can be further improved by arranging the positioning hole.

In some embodiments, in the thickness direction of the interposer, a center line of the first cladding layer, a center line of the second cladding layer, and a center line of the fuse portion coincide with each other; in some embodiments, in the arrangement direction of the first connection portion and the second connection portion, a center line of the first cladding layer, a center line of the second cladding layer, and a center line of the fusing portion coincide with each other. So, through setting up the relative position relation between first cladding layer, second cladding layer, the fusing portion, be convenient for when fusing portion fuses, the first cladding layer of thermal deformation can all wrap up fusing portion after fusing to and improve the reliability of second cladding layer to fusing portion fixed stay.

In a second aspect, the present application provides a battery cell, which includes a tab, an electrode terminal, and the interposer in the above embodiments; the first connecting part of the adapter sheet is electrically connected with the electrode terminal, and the second connecting part is connected with the tab. Therefore, the adapter sheet in the embodiment is used, so that the safety performance of the battery monomer is improved.

In a third aspect, the present application provides a battery, which includes a battery box and a single battery in the foregoing embodiment, wherein the single battery is accommodated in the battery box. Thus, the reliability of the battery is improved due to the use of the battery cell in the above embodiment.

In a fourth aspect, the present application provides an electric device, which includes the battery in the above embodiments, wherein the battery is used for providing electric energy. Therefore, the safety performance of the electric device is improved due to the use of the battery in the embodiment.

According to the characteristics of the fusing part during fusing, the first coating layer and the second coating layer are sequentially coated outside the fusing part. When fusing portion fuses, the high temperature that produces in the twinkling of an eye makes first cladding layer can be at the inside deformation by heating of second cladding layer, wraps up the fusing portion after fusing to reach insulation protection's effect. And the second cladding layer wraps up outside the fusing part, can provide the effect of fixed stay for the switching piece after the fusing, avoids the electrolyte contact fusing part in the battery. Therefore, the use safety performance of the battery is improved.

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

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

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

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is a schematic structural view of an interposer according to some embodiments of the present application;

FIG. 5 is an exploded view of an interposer according to some embodiments of the present application;

FIG. 6 isbase:Sub>A schematic cross-sectional view A-A of FIG. 4 in accordance with certain embodiments of the present disclosure;

FIG. 7 is a schematic cross-sectional view of B-B of FIG. 4 in some embodiments of the present application;

FIG. 8 is a schematic illustration of an orthographic projection of the second cladding layer on a reference plane, an orthographic projection of the first cladding layer on a reference plane, and a fuse on a reference plane in some embodiments of the present application;

FIG. 9 is a schematic view of the first connection portion, the second connection portion and the fuse portion from one perspective in some embodiments of the present application;

FIG. 10 is a schematic view of a first connection portion, a second connection portion and a fuse portion in accordance with further embodiments of the present application from a single perspective;

FIG. 11 isbase:Sub>A schematic cross-sectional view A-A of FIG. 4 in accordance with further embodiments of the present application;

FIG. 12 is a schematic view of a first connection portion, a second connection portion, and a fuse portion from a perspective in accordance with further embodiments of the present application;

FIG. 13 isbase:Sub>A cross-sectional view A-A of FIG. 4 in accordance with still further embodiments of the present application.

The reference numbers in the detailed description are as follows:

a vehicle 1000;

battery 100, controller 200, motor 300;

a battery case 10, a first portion 11, a second portion 12;

the battery cell 20, the housing 21, the electric core assembly 22, the main body part 221, the tab 222, the top cover assembly 23, the top cover plate 231, the electrode terminal 232, the adaptor sheet 24, the first connecting part 241, the second connecting part 242, the fusing part 243, the insulating coating structure 244, the first coating layer 244a, the second coating layer 244b, the through hole k1 and the positioning hole k2;

a first side s1, a second side s2;

a first dimension L1, a second dimension L2, a third dimension L3, a fourth dimension L4, a fifth dimension L5, a sixth dimension L6, a seventh dimension L7, an eighth dimension L8, a ninth dimension L9;

a reference plane R, a first profile P1, a second profile P2, a third profile P3;

a first center line c1, a second center line c2;

a first direction F1, a second direction F2, and a third direction F3.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

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 herein 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.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

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

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

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles and electric automobiles, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The inventor of the present application has noticed that when an excessive current is generated due to electricity abuse, the adaptor plate in the battery may be fused to cut off the over-current loop, thereby reducing the safety risk of the battery. In the process, when the battery is subjected to external force, the fused adapter plate is reconnected and conducted, so that the battery is disabled.

In order to solve the problem that the disconnected adapter plate is reconnected and conducted in the use process of the battery so that the battery fails, the inventor of the application finds that an insulating coating structure can be arranged outside the fusing part of the adapter plate. Particularly, when the fusing parts are fused, the insulating coating structures can isolate the fused fusing parts from each other. However, if the insulation covering structure cannot completely cover the fused portion after fusing, the uncoated fused portion is exposed to the electrolyte, and a high voltage breakdown is likely to occur. Meanwhile, when fusing, the uncoated fusing part is still in an unstable state capable of flowing, and under some mechanical working conditions such as vibration, the situation that the fused fusing part is reconnected and conducted to further enable the battery to be invalid still exists.

Based on the above consideration, in order to solve the problem that the adapter sheet disconnected in the use process of the battery is reconnected and conducted and then the battery is disabled, through intensive research, the inventor of the application designs the adapter sheet, an insulating coating structure comprising a first coating layer and a second coating layer is sequentially coated and arranged outside the fusing part of the adapter sheet, and the second coating layer completely coats the first coating layer, so that when the fusing part of the adapter sheet is fused, the fusing part of the fusing part can be coated by the insulating coating structure.

In the adapter plate, the second coating layer is coated outside the first coating layer, so that when the fusing part is fused, the fused fusing part can be coated by the first coating layer through thermal deformation, and the insulating protection effect is achieved. And the second cladding layer parcel not only can provide the effect of fixed stay for the switching piece after fusing outside the fusing, alleviates the switching piece of disconnection and takes place to reconnect and switch on and then make the problem that the battery became invalid in the battery use, can also avoid the electrolyte contact fusing in the battery. Therefore, the use safety of the battery is improved.

The adapter piece that this application embodiment described is applicable to battery monomer, battery and the power consumption device who uses the battery, like this, is favorable to alleviating the adapter piece of disconnection and takes place to reconnect and switch on and make the problem that the battery became invalid, guarantees the safety in utilization performance of battery.

The battery cell disclosed in the embodiment of the present application can be used in, but not limited to, an electric device for a vehicle, a ship, an aircraft, or the like. The power supply system who possesses this power consumption device of constitution such as battery monomer, battery that this application is disclosed can be used, like this, is favorable to alleviating and automatically regulated electric core bulging force worsens, and supplementary electrolyte consumes, promotes the stability and the battery life of battery performance.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments are described by taking an electric device according to an embodiment of the present application as an example of a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided 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, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a battery case 10 and a battery cell 20, and the battery cell 20 is accommodated in the battery case 10. The battery case 10 is used to provide a receiving space for the battery cells 20, and the battery case 10 may have various structures. In some embodiments, the battery case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with an open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the battery case 10 formed by the first and

second portions

11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery monomers 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers 20 is accommodated in the battery box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the battery modules in the battery box 10. The battery 100 may also include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded structural schematic diagram of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. Referring to fig. 3, the battery cell 20 includes a housing 21, a cell assembly 22, a cap assembly 23, an interposer 24, and other functional components.

The housing 21 has a housing chamber and an opening communicating with the housing chamber. The receiving cavity may be used to receive the cell assembly 22, electrolyte, and other components. The housing 21 may be of various shapes and various sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape of the housing 21 may be determined according to the specific shape and size of the electric core assembly 22. The material of the housing 21 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

The cell assembly 22 is a component of the battery cell 20 where electrochemical reactions occur. One or more electrical core assemblies 22 may be contained within the housing 21. The core assembly 22 includes a body part 221 and a tab 222 coupled to the body part 221. Specifically, the core assembly 22 may be formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material may constitute the body portion 221 of the core assembly 22, and the portions of the positive and negative electrode tabs having no active material each constitute the tab 222. The positive electrode tab and the negative electrode tab may be located at one end of the body part 221 together or at both ends of the body part 221, respectively. Alternatively, as shown in fig. 3, the tab 222 may be located at one end in the height direction of the core assembly 22.

The cap assembly 23 is used to seal the housing 21 to seal the cell assembly 22 within the housing 21. The cap assembly 23 may include a cap plate 231 and an electrode terminal 232. The top cover plate 231 covers the opening of the case 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the top cover plate 231 may be adapted to the shape of the housing 21 to fit the housing 21. The top cover plate 231 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the top cover plate 231 is not easily deformed when being extruded and collided, and thus the battery cell 20 may have a higher structural strength, and the safety performance may be improved. The electrode terminal 232 is disposed on the top cover plate 231, and a portion of the electrode terminal 232 is located on the inner surface side of the top cover plate 231 and can be electrically connected with the tab 222 of the electric core assembly 22 through the adaptor sheet 24 for outputting or inputting the electric energy of the battery cell 20. During the charging and discharging processes of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 222 is connected with the electrode terminal 232 by the adapter sheet 24 to form a current loop.

In some embodiments, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may be further disposed on the top cover plate 231. The top cover plate 231 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not limited in this embodiment. In some embodiments, an insulator may also be provided on the inside of the top cover plate 231, and may be used to isolate the electrical connection components within the housing 21 from the top cover plate 231 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

According to some embodiments of the present application, please continue to refer to fig. 3, and please further refer to fig. 4 to 5, fig. 4 is a schematic structural diagram of the interposer 24 according to some embodiments of the present application; fig. 5 is an exploded view of interposer 24 according to some embodiments of the present application. The present application provides an interposer 24. The interposer 24 includes a first connecting portion 241, a second connecting portion 242, a fusing portion 243 and an insulating covering structure 244. The first connection portion 241 is used for the first connection portion 241 electrically connected to the electrode terminal 232. The second connection portion 242 is used to electrically connect with the tab 222. The fusing part 243 is connected between the first and second connecting

parts

241 and 242. The insulating coating structure 244 includes a first coating layer 244a and a second coating layer 244b sequentially coated on the fuse portion 243. The melting point of the second cladding layer 244b is greater than that of the first cladding layer 244a. The second cladding layer 244b is configured to completely clad the first cladding layer 244a.

When the current flowing through the interposer 24 is greater than the predetermined threshold value, the fusing portion 243 is fused by heat, and the first clad layer 244a is deformed by heat.

As shown in the figure, a first direction F1 is an arrangement direction of the first connection portion 241 and the second connection portion 242, a second direction F2 is a thickness direction of the interposer 24, a third direction F3 is a width direction of the interposer 24, and the first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other. And will not be described in detail later.

The first connection portion 241 may be welded and fixed to the electrode terminal 232 by laser, and the second connection portion 242 may be welded and fixed to the tab 222 by laser. The first connection portion 241 and the second connection portion 242 each include a conductive material so that current can flow through the interposer 24. The first connecting portion 241 and the second connecting portion 242 may be made of metal such as aluminum or copper, or other conductive materials such as aluminum alloy or copper alloy. The second connection portion 242 may be in a shape of a long strip or a curve, and the extending direction of the second connection portion 242 may be the same as the arrangement direction (i.e., the first direction F1) of the first connection portion 241 and the second connection portion 242, or may intersect the arrangement direction (i.e., the first direction F1) of the first connection portion 241 and the second connection portion 242. Fig. 4 to 5 illustrate a case where the extending direction of the second connection portion 242 is the same as the first direction F1. The extending direction and the shape of the second connection portion 242 may be set according to actual use conditions, and the embodiment of the present application does not specifically limit this.

The fusing portion 243 includes a conductive material so that current can flow through the interposer 24 through the fusing portion 243. When a current flows through the interposer 24, the fusing portion 243 can generate heat and increase the temperature. When the current flowing through the interposer 24 is greater than the predetermined threshold, the fusing portion 243 heats up to its melting point and fuses. The preset threshold may be determined according to a use condition, and the overcurrent cross-sectional area of the fusing part 243 may be determined according to the preset threshold, so that the fusing part 243 is fused by heating when the current flowing through the interposer 24 is greater than the preset threshold.

In some embodiments, the first connection portion 241, the fusing portion 243, and the second connection portion 242 may be an integral structure, and may be manufactured by an integral molding method such as punch forming. The selection can be performed according to the actual use situation, and this is not particularly limited in the embodiments of the present application.

Insulating coating structure 244 covers the outside of fusing portion 243, and can cover the entire fusing portion 243. The insulating coating 244 includes a first coating 244a and a second coating 244b sequentially coated on the fuse 243, that is, the first coating 244a is coated on the fuse 243, and then the second coating 244b is coated on the first coating 244a.

It is understood that the insulating coating 244 has an insulating property and cannot conduct electricity. And the insulating clad structure 244 includes a first clad layer 244a and a second clad layer 244b, that is, the first clad layer 244a and the second clad layer 244b have insulating properties and cannot conduct electricity.

The first cladding 244a is deformed by heat when the fusing portion 243 is fused by heat, which means that the fusing portion 243 has a smaller thermal sensitivity coefficient relative to the melting point thereof, is insensitive to temperature, and can be used in an environment with a larger temperature variation. The first coating layer 244a does not change its state during normal operation of the battery. When the fusing portion 243 is fused, the first cladding layer 244a may be deformed under a high temperature environment instantaneously generated due to the fusing of the fusing portion 243. The first clad 244a may at least partially cover the fusing part 243, which is thermally fused, when it is deformed by heat. That is, the first cladding layer 244a deformed by heat may completely cover the fusing part 243 fused by heat, or may not completely cover the fusing part 243 fused by heat. The first clad layer 244a deformed by heat may be in a melt-flowing state or a state having a certain deformation.

The melting point of the second cladding layer 244b is greater than that of the first cladding layer 244a, meaning that the second cladding layer 244b has certain high temperature resistance compared to the first cladding layer 244a with respect to the melting point of the fusing part 243. The second cladding layer 244b has the ability to resist deformation and flow when the fusing portion 243 is fused.

When the current flowing through the interposer 24 is greater than the preset threshold, the fusing portion 243 is heated and fused to cut off the current, so as to avoid potential safety hazard caused by overcharge of the battery. When the fusing portion 243 is thermally fused, the first clad layer 244a is deformed by a high temperature instantaneously generated. Since the second cladding layer 244b completely encapsulates the first cladding layer 244a, and the second cladding layer 244b can have a stable form against a high temperature generated when the fusing part 243 is fused, the deformed first cladding layer 244a can be confined in the second cladding layer 244b, so that the first cladding layer 244a can at least partially encapsulate the fused fusing part 243. Therefore, the first coating layer 244a confined in a certain space can enter between the fused portions 243 that are fused when deformed by heat, and coat the fused portions 243. If a plurality of beads are generated during the fusing of the fusing portion 243, the fusing portion may be wrapped by the deformed first wrapping layer 244a. Meanwhile, since the second cladding layer 244b has a stable shape, the fused fusing part 243 can be fixed all the time, which is not only beneficial to the process that the first cladding layer 244a wraps the fused fusing part 243, but also can avoid the fused fusing part 243 from secondary contact. When the electrolyte contacts the interposer 24, the second cladding layer 244b and the first cladding layer 244a sequentially form a path which can block the electrolyte from entering the fusing part 243, so that double blocking is formed, and the risk of high-voltage breakdown is reduced.

Therefore, by arranging the first coating layer 244a and the second coating layer 244b, the problem that the adapter sheet 24 disconnected in the use process of the battery is reconnected and conducted to cause the battery to be invalid can be solved, and the high-voltage breakdown caused by the fact that the electrolyte in the battery contacts the fusing part 243 can be avoided. Therefore, the use safety performance of the battery is improved.

According to some embodiments of the present disclosure, optionally, please continue to refer to fig. 4, and please further refer to fig. 6 to 8, fig. 6 isbase:Sub>A schematic cross-sectional structure ofbase:Sub>A-base:Sub>A of fig. 4 in some embodiments of the present disclosure, fig. 7 isbase:Sub>A schematic cross-sectional structure of B-B of fig. 4 in some embodiments of the present disclosure, and fig. 8 isbase:Sub>A schematic cross-sectional structure ofbase:Sub>A second cladding layer 244B,base:Sub>A first cladding layer 244base:Sub>A, andbase:Sub>A fuse 243 in some embodiments of the present disclosure, which are orthographic projections of the second cladding layer 244B onbase:Sub>A reference plane R, the first cladding layer 244base:Sub>A on the reference plane R, and the fuse 243 on the reference plane R. The distance between the outer contour of the second cladding layer 244b and the outer contour of the first cladding layer 244a along the arrangement direction of the first connection portion 241 and the second connection portion 242 is 1 mm or more.

More specifically, in a plane (i.e., the reference plane R) parallel to the arrangement direction of the first connecting portion 241 and the second connecting portion 242 and the thickness direction of the interposer 24, the outer contour of the orthographic projection of the second cladding layer 244b is a first contour P1, and the outer contour of the orthographic projection of the first cladding layer 244a is a second contour P2. Along the arrangement direction (i.e., the first direction F1) of the first connecting portion 241 and the second connecting portion 242, a distance between the first outer contour and the second outer contour is a first dimension L1, and the first dimension L1 is greater than or equal to 1 mm.

By defining the size of the first dimension L1, on the one hand, when the fusing portion 243 is fused, the second cladding layer 244b can wrap the thermally deformed first cladding layer 244a, thereby performing an insulation protection function. On the other hand, the second cladding layer 244b may improve structural strength, improve reliability of fixing and supporting the fusing part 243, and facilitate the first cladding layer 244a deformed by heat to stably wrap the fused fusing part 243 after fusing when the fusing part 243 is fused.

According to some embodiments of the present application, optionally, with continuing reference to fig. 4 and further referring to fig. 6 to 8, along the arrangement direction of the first connection portion 241 and the second connection portion 242, a distance between the outer contour of the first cladding layer 244a and the outer contour of the fuse portion 243 is greater than or equal to 2 mm.

More specifically, with continued reference to fig. 8, in a plane (i.e., the reference plane R) parallel to the arrangement direction of the first connecting portion 241 and the second connecting portion 242 and the thickness direction of the interposer 24, the orthographic projection of the fusing portion 243 has an outer profile P3. It is understood that the orthographic outer contour of the first cladding 244a is the second contour P2. Along the arrangement direction of the first connecting portion 241 and the second connecting portion 242, the distance between the second outer contour and the third outer contour is a second dimension L2, and the second dimension L2 is greater than or equal to 2 mm.

By defining the size of the second dimension L2, it is more favorable for the first cladding layer 244a to wrap the fused portion 243 after fusing, so as to achieve the insulation protection effect.

It should be noted that, in the first direction F1, the distances between the first outer contour and the second outer contour may be all one size, or may be different sizes, as long as the first size L1 is equal to or greater than 1 mm, and the embodiment of the present application is not particularly limited. The distance between the second outer contour and the third outer contour in the first direction F1 can also be considered, and is not described herein again. Fig. 8 illustrates that, in the first direction F1, the distance between the first outer contour and the second outer contour is the same size, and the distance between the second outer contour and the third outer contour is the same size, which is more beneficial for molding. When the first connection portion 241 is welded and fixed to the electrode terminal 232 and the second connection portion 242 is welded and fixed to the tab 222 by laser, the first dimension L1 and the second dimension L2 may be determined according to the length of the generated weld, as long as the first connection portion 241 and the second connection portion 242 satisfy the welding conditions, which is not particularly limited in the embodiment of the present application.

According to some embodiments of the present application, optionally, with continued reference to fig. 7, the interposer 24 has a first side s1 and a second side s2 opposite in the thickness direction of the interposer 24. In the thickness direction (i.e., the second direction F2) of the interposer 24, the size of the first cladding layer 244a on the first side s1 is a third size L3, the size of the second cladding layer 244b on the first side s1 is a fourth size L4, and the ratio of the third size L3 to the fourth size L4 is greater than or equal to 1. According to other embodiments of the present application, optionally, in the thickness direction of the interposer 24, the size of the first cladding layer 244a on the second side s2 is a fifth size L5, the size of the second cladding layer 244b on the second side s2 is a sixth size L6, and a ratio of the fifth size L5 to the sixth size L6 is greater than or equal to 1.

It should be noted that, in the thickness direction of the interposer 24, the size of the first cladding layer 244a on the first side s1 may be the same as or different from the size of the first cladding layer 244a on the second side s2, and the size of the second cladding layer 244b on the first side s1 may be the same as or different from the size of the second cladding layer 244b on the second side s2. Fig. 6 and 7 illustrate that, in the thickness direction of the interposer 24, the size of the first cladding layer 244a on the first side s1 is the same as the size of the first cladding layer 244a on the second side s2, and the size of the second cladding layer 244b on the first side s1 is the same as the size of the second cladding layer 244b on the second side s2, which is more beneficial for molding. These dimensions can be set according to actual use conditions, and the embodiment of the present application does not specifically limit this.

By defining the relationship between the third dimension L3 and the fourth dimension L4, and the relationship between the fifth dimension L5 and the sixth dimension L6, the second cladding layer 244b can completely wrap the first cladding layer 244a, and further the wrapping property of the second cladding layer 244b on the first cladding layer 244a is satisfied, so that the reliability of the second cladding layer 244b on the first cladding layer 244a for fixing and supporting is improved.

According to some embodiments of the present application, optionally, the first cladding 244a on the first side s1 has a dimension of 0.1 mm to 1 mm in the thickness direction of the interposer 24. According to some embodiments of the present application, optionally, the second cladding layer 244b on the first side s1 has a size of 0.1 mm to 1 mm in the thickness direction of the interposer 24. According to some embodiments of the present application, the first cladding 244a on the second side s2 optionally has a dimension of 0.1 mm to 1 mm in the thickness direction of the interposer 24. According to some embodiments of the present application, optionally, the second cladding layer 244b on the second side s2 has a size of 0.1 mm to 1 mm in the thickness direction of the interposer 24.

By further defining the size range of the first cladding layer 244a on the first side s1 of the interposer 24, the size range of the second cladding layer 244b on the first side s1 of the interposer 24, the size range of the first cladding layer 244a on the second side s2 of the interposer 24, and the size range of the second cladding layer 244b on the second side s2 of the interposer 24 in the thickness direction of the interposer 24, not only the wrappability of the second cladding layer 244b on the first cladding layer 244a but also the wrappability of the first cladding layer 244a on the fused portion 243 after fusing can be satisfied.

According to some embodiments of the present application, optionally, the material of the first coating layer 244a includes at least one of polyethylene, oxidized polyethylene, and polyvinyl alcohol copolymer. According to some embodiments of the present application, optionally, the material of the second cladding layer 244b includes at least one of a ceramic material (e.g., alumina, aluminum nitride, boron nitride, etc.), polyimide, and a fluoroelastomer.

It is noted that the first cladding 244a and the second cladding 244b may be in the form of coatings, or may be in other forms such as sheaths. Taking the second cladding layer 244b as a coating layer and the material of the second cladding layer 244b as a ceramic material as an example, the second cladding layer 244b can be obtained by a plasma process, so that the adhesion strength of the second cladding layer 244b can be improved, and the second cladding layer 244b is prevented from falling off, thereby improving the fixing and supporting functions of the second cladding layer 244b. Of course, other manufacturing processes can be used to manufacture the second cladding layer 244b, such as injection molding, extrusion, cold isostatic pressing, hot pressing, and hot isostatic pressing, which are not limited in this embodiment. Accordingly, the first cladding 244a may be considered as such and will not be described in detail herein.

By selecting the material of the first cladding 244a, the first cladding 244a has low thermal sensitivity, and is easily melted into a fluid state when the fusing portion 243 is fused, so as to wrap the fused fusing portion 243. By selecting the material of the second cladding layer 244b, the second cladding layer 244b has high temperature resistance and insulation properties, and can play a role of insulation protection, fixing and supporting the fused portion 243 after fusing, and wrapping the first cladding layer 244a melted to be in a flowing state.

According to some embodiments of the present application, optionally, the melting point of the first cladding layer 244a is T1, the melting point of the second cladding layer 244b is T2, and the ratio of T2 to T1 is greater than or equal to 3.

By defining the relationship between the melting point of the first cladding layer 244a and the melting point of the second cladding layer 244b, the second cladding layer 244b can better provide a fixing support effect when the first cladding layer 244a is deformed by heat.

According to some embodiments of the present application, optionally, T1 is 90 ℃ to 130 ℃ and T2 ≧ 600 ℃. The material of the interposer 24 and the operating temperature of the battery can be selected according to the present invention, which is not limited in this embodiment.

By selecting the first coating layer 244a having a desired melting point, the temperature response sensitivity and flow wrapping property of the first coating layer 244a can be ensured, and the melted portion 243 can be rapidly coated in a melted state when the melted portion 243 is melted. By selecting the second cladding layer 244b having a desired melting point, the second cladding layer 244b can withstand high temperature, avoid the influence of high temperature generated when the fusing portion 243 is fused, and improve the reliability of the second cladding layer 244b.

According to some embodiments of the present application, optionally, in the thickness direction of the interposer 24, the size of the fusing part 243 is smaller than the size of the first connecting part 241 and the size of the second connecting part 242. Alternatively, the fusing part 243 may be thinned by a upsetting process.

Through the thinning processing of the fusing part 243, when the current flowing through the adapter sheet 24 is larger than a preset threshold value, the fusing part 243 can be fused more quickly, so that the battery can be protected.

According to some embodiments of the present disclosure, optionally, please refer to fig. 9, where fig. 9 is a schematic structural diagram of the first connection portion 241, the second connection portion 242, and the fusing portion 243 in one view in some embodiments of the present disclosure. In some embodiments, the dimension of the fusing portion 243 in the width direction of the interposer 24 is a seventh dimension L7, the dimension of the first connecting portion 241 is an eighth dimension L8, the dimension of the second connecting portion 242 is a ninth dimension L9, and the seventh dimension L7 is smaller than the eighth dimension L8 and the ninth dimension L9. The relationship between the eighth dimension L8 and the ninth dimension L9 can be set according to practical situations, and is not particularly limited in the embodiments of the present application. Fig. 9 illustrates a case where the eighth dimension L8 is equal to the ninth dimension L9.

By sizing the fusing part 243 to obtain a desired overcurrent cross-sectional area at the fusing part 243, the fusing part 243 can be fused more quickly when an excessive current is generated, thereby protecting the battery.

According to some embodiments of the present application, optionally, please refer to fig. 10 and fig. 11, and refer to fig. 4 in combination, fig. 10 isbase:Sub>A schematic structural diagram ofbase:Sub>A first connection portion 241,base:Sub>A second connection portion 242, andbase:Sub>A fuse portion 243 in other embodiments of the present application at one viewing angle, and fig. 11 isbase:Sub>A schematic sectional structural diagram ofbase:Sub>A-base:Sub>A of fig. 4 in other embodiments of the present application. The fusing portion 243 is provided with a through hole k1.

When the first over-coating layer 244a is formed by coating or the like, further fixing between the first over-coating layer 244a and the fusing part 243 may be achieved by the through hole k1, and when the fusing part 243 is fused, an effect of the first over-coating layer 244a over-coating the fusing part 243 may be improved. If the first cladding 244a is only in contact with the outer surface of the fusing part 243 before the fusing part 243 is fused, the deformed first cladding 244a may enter the through hole k1 when the fusing part 243 is fused, and the effect of the first cladding 244a cladding the fusing part 243 may be further improved.

In this way, the contact area and the fixing area of the first coating layer 244a with the fusing part 243 may be increased, further improving the coating effect of the melted first coating layer 244a.

According to some embodiments of the present application, optionally, the through hole k1 comprises at least one of a circular hole, a square hole, and a diamond hole. According to some embodiments of the present application, optionally, the through hole k1 is provided in a plurality, and the plurality of through holes k1 are arranged along the predetermined direction. Fig. 10 and 11 illustrate a case where the predetermined direction is the third direction F3, and three circular through holes k1 are provided. The shape, number and arrangement of the through holes k1 may be set according to actual use conditions, which is not specifically limited in the embodiment of the present application.

The wrapping effect of the thermally deformed first wrapping layer 244a is further improved by the design of the shape of the through holes k1 and the arrangement of the through holes k1.

According to some embodiments of the present application, optionally, please refer to fig. 12 and fig. 13, and refer to fig. 4 in combination, fig. 12 isbase:Sub>A schematic structural diagram ofbase:Sub>A first connecting portion 241,base:Sub>A second connecting portion 242, andbase:Sub>A fusing portion 243 in yet other embodiments of the present application at one viewing angle, and fig. 13 isbase:Sub>A schematic sectional structural diagram ofbase:Sub>A-base:Sub>A of fig. 4 in yet other embodiments of the present application. The second coating layer 244b has contact areas with the first connection portion 241 and the second connection portion 242, respectively, in the arrangement direction of the first connection portion 241 and the second connection portion 242 and in the thickness direction of the interposer 24. The first connecting portion 241 located at the contact region and/or the second connecting portion 242 located at the contact region are provided with positioning holes k2. The second coating layer 244b is fitted to the coupling portion provided with the positioning hole k2 by means of the positioning hole k2.

At least one of the first connecting portion 241 and the second connecting portion 242 is provided with a positioning hole k2. For example, when the second cladding layer 244b is provided in the form of a coating layer, connection with the inside of the corresponding connection portion may be achieved by means of the positioning hole k2, increasing the bonding area between the second cladding layer 244b and the corresponding connection portion, and improving the fixing effect between the second cladding layer 244b and the corresponding connection portion. The positioning hole k2 may include at least one of a circular hole, a square hole, and a diamond hole. The positioning holes k2 may be provided in one, two, or other number. Fig. 12 and 13 illustrate a situation where the positioning hole k2 is formed along the thickness direction of the interposer 24, the positioning hole k2 is a circular hole, and two positioning holes k2 are formed in the first connecting portion 241 and two positioning holes k2 are formed in the second connecting portion 242. It is understood that the position of the positioning hole k2 is related to the size of the second cladding layer 244b, and the shape, number and arrangement of the positioning holes k2 can be set according to the actual use condition as long as the positioning holes k2 are arranged in the above-mentioned contact region, which is not particularly limited by the embodiment of the present application.

By providing the positioning hole k2, the second cladding layer 244b can be more firmly attached to the first connection portion 241 and/or the second connection portion 242, and the reliability of fixing the second cladding layer 244b to the first connection portion 241 and/or the second connection portion 242 can be further improved.

According to some embodiments of the present application, optionally, with continuing reference to fig. 4 in combination with fig. 7, a centerline of the first cladding layer 244a, a centerline of the second cladding layer 244b, and a centerline of the fuse 243 coincide with each other (i.e., coincide with the first centerline c1 illustrated in fig. 4 and 7) in the thickness direction of the interposer 24. According to some embodiments of the present application, optionally, with continuing reference to fig. 4 and with combined reference to fig. 6 and 7, in the arrangement direction of the first connection portion 241 and the second connection portion 242, the center line of the first cladding layer 244a, the center line of the second cladding layer 244b, and the center line of the fuse portion 243 coincide with each other (i.e., coincide with the second center line c2 illustrated in fig. 4, 6, and 7).

Since the center lines are overlapped with each other, the first coating layer 244a deformed by heat can more uniformly coat the fused fusing part 243, and the coating effect is more uniform. In this way, by setting the relative position relationship among the first cladding layer 244a, the second cladding layer 244b and the fusing part 243, when the fusing part 243 is fused, the fused part 243 can be better wrapped by the first cladding layer 244a deformed by heat, and the reliability of the second cladding layer 244b in fixing and supporting the fusing part 243 is improved.

The present application also provides a battery cell 20 including a tab 222, an electrode terminal 232, and an interposer 24 according to any of the above aspects, according to some embodiments of the present application. The first connection portion 241 of the interposer 24 is electrically connected to the electrode terminal 232, and the second connection portion 242 is connected to the tab 222. Thus, the safety performance of the battery cell 20 is improved due to the use of the interposer 24 in the above embodiment.

According to some embodiments of the present application, the present application also provides a battery 100, which includes a battery case 10 and the battery cell 20 in any of the above aspects, wherein the battery cell 20 is accommodated in the battery case 10. Thus, since the battery cell 20 in the above embodiment is used, the reliability of the battery is improved.

According to some embodiments of the present application, the present application further provides an electric device, which includes the battery 100 of any of the above aspects, and the battery 100 is used for providing electric energy. Thus, since the battery 100 in the above embodiment is used, the safety performance of the electric device is improved.

The powered device may be any of the aforementioned devices or systems that employ battery 100.

Referring to fig. 4-7, an aluminum interposer 24 is provided according to some embodiments of the present application. The interposer 24 includes a first connection portion 241, a fusing portion 243, and a second connection portion 242 connected in this order. The first connection portion 241, the fusing portion 243, and the second connection portion 242 may be formed in an integrated structure, and the fusing portion 243 may be thinned such that the thickness of the fusing portion 243 is smaller than the thickness of the first connection portion 241 and the thickness of the second connection portion 242. The fusing portion 243 is provided with a through hole k1. The first connecting portion 241 and the second connecting portion 242 are provided with positioning holes k2. The interposer 24 further includes an insulating coating 244 disposed outside the fuse 243. The insulating clad structure 244 includes a first clad layer 244a and a second clad layer 244b. The fusing portion 243 of the interposer 24 may be coated with a first coating layer 244a by a coating process, and then a second coating layer 244b that may completely coat the first coating layer 244a may be formed by an injection molding process. When the current flowing through the interposer 24 is greater than the predetermined threshold value, the fusing portion 243 is fused by heat, and the first cladding layer 244a is in a fused state by heat. Since the first cladding layer 244a is clad with the second cladding layer 244b, the first cladding layer 244a can melt and flow inside the second cladding layer 244b, and the melted fusing part 243 is clad for insulation protection.

In summary, according to the characteristics of the fuse portion 243 when it is fused, the first cladding layer 244a and the second cladding layer 244b are sequentially clad outside the fuse portion 243 in the embodiment of the present application. When the fusing part 243 is fused, the first cladding layer 244a may be thermally deformed inside the second cladding layer 244b due to the high temperature generated instantaneously, and the fused fusing part 243 is wrapped, so as to achieve the insulation protection effect. The second cladding layer 244b wraps the fusing part 243 to provide a fixing support for the fused interposer 24, so as to prevent the electrolyte in the battery from contacting the fusing part 243. Therefore, the use safety performance of the battery is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit of the embodiments of the present application, and they should be construed as being included in the scope of the claims and description of the present 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 is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. An interposer for a battery cell (20), the interposer comprising:

a first connection part (241) for electrically connecting with an electrode terminal (232) of the battery cell (20);

a second connection part (242) for electrically connecting a tab (222) of the battery cell (20);

a fusing part (243) connected between the first connecting part (241) and the second connecting part (242); and

an insulating coating structure (244) including a first coating layer (244 a) and a second coating layer (244 b) sequentially coated outside the fuse portion (243);

wherein the second cladding layer (244 b) has a melting point greater than the melting point of the first cladding layer (244 a), the second cladding layer (244 b) being configured to completely encapsulate the first cladding layer (244 a);

when the current flowing through the adapter sheet is larger than a preset threshold value, the fusing part (243) is fused by heating, and the first coating layer (244 a) is deformed by heating.

2. The interposer as claimed in claim 1, wherein a distance between an outer contour of the second cladding layer (244 b) and an outer contour of the first cladding layer (244 a) along the arrangement direction of the first connecting portion (241) and the second connecting portion (242) is greater than or equal to 1 mm.

3. The interposer as recited in claim 1, wherein a distance between an outer contour of the first coating layer (244 a) and an outer contour of the fuse portion is 2 mm or more in an arrangement direction of the first connection portion (241) and the second connection portion (242).

4. The interposer as recited in claim 1, wherein the interposer has a first side (s 1) and a second side (s 2) opposite in a thickness direction of the interposer;

wherein, in the thickness direction of the interposer, the ratio of the size of the first cladding layer (244 a) on the first side (s 1) to the size of the second cladding layer (244 b) on the first side (s 1) is greater than or equal to 1; and/or

In the thickness direction of the interposer, the ratio of the size of the first cladding layer (244 a) on the second side (s 2) to the size of the second cladding layer (244 b) on the second side (s 2) is greater than or equal to 1.

5. The interposer as recited in any one of claims 1-4, wherein the material of the first coating layer (244 a) comprises at least one of polyethylene, oxidized polyethylene, polyvinyl alcohol based copolymer; and/or

The material of the second coating layer (244 b) comprises at least one of ceramic material, polyimide and fluororubber.

6. The interposer as recited in any one of claims 1 to 4, wherein the first coating layer (244 a) has a melting point T1 and the second coating layer (244 b) has a melting point T2;

the ratio of T2 to T1 is greater than or equal to 3.

7. The interposer as recited in claim 6, wherein T1 is between 90 ℃ and 130 ℃ and T2 is greater than or equal to 600 ℃.

8. The interposer as recited in any one of claims 1 to 4, wherein a dimension of the fusing portion (243) is smaller than a dimension of the first connecting portion (241) and a dimension of the second connecting portion (242) in a thickness direction of the interposer; and/or

The dimension of the fusing part (243) is smaller than the dimension of the first connecting part (241) and the dimension of the second connecting part (242) in the width direction of the adapter sheet;

the width direction of the adapter sheet, the thickness direction of the adapter sheet and the arrangement direction of the first connecting part (241) and the second connecting part (242) are mutually perpendicular.

9. The interposer as claimed in any one of claims 1 to 4, wherein the fusing section (243) is provided with a through hole (k 1).

10. The interposer as recited in claim 9, wherein the through-holes (k 1) comprise at least one of circular holes, square holes, and diamond holes; and/or

The through holes (k 1) are arranged in a plurality, and the through holes (k 1) are arranged along a preset direction.

11. The interposer according to any one of claims 1 to 4, wherein the second coating layer (244 b) has contact areas with the first connection portion (241) and the second connection portion (242), respectively, in the arrangement direction of the first connection portion (241) and the second connection portion (242) and in the thickness direction of the interposer;

positioning holes (k 2) are arranged on the first connecting part (241) positioned in the contact area and/or the second connecting part (242) positioned in the contact area;

the second coating layer (244 b) is matched with a connecting part provided with the positioning hole (k 2) through the positioning hole (k 2).

12. The interposer as recited in any one of claims 1 to 4, wherein, in a thickness direction of the interposer, a center line of the first clad layer (244 a), a center line of the second clad layer (244 b), and a center line of the fuse portion (243) coincide with each other; and/or

In the arrangement direction of the first connection portion (241) and the second connection portion (242), a center line of the first clad layer (244 a), a center line of the second clad layer (244 b), and a center line of the fusing portion (243) coincide with each other.

13. A battery cell comprising a tab (222), an electrode terminal (232) and an interposer as claimed in any one of claims 1-12;

the first connecting portion (241) of the interposer is electrically connected to the electrode terminal (232), and the second connecting portion (242) is connected to the tab (222).

14. A battery, comprising:

a battery case (10); and

the battery cell of claim 13, which is accommodated in the battery case (10).

15. An electrical device comprising the battery of claim 14, wherein the battery is configured to provide electrical energy.