WO2022160494A1

WO2022160494A1 - Adapter sheet, secondary battery and battery module

Info

Publication number: WO2022160494A1
Application number: PCT/CN2021/091781
Authority: WO
Inventors: 王有生; 李华; 远浩; 夏春文
Original assignee: 常州瑞德丰精密技术有限公司
Priority date: 2021-01-29
Filing date: 2021-04-30
Publication date: 2022-08-04
Also published as: CN112787047A

Abstract

Disclosed are an adapter sheet, a secondary battery and a battery module. The adapter sheet comprises a first connecting portion, a fuse portion, a second connecting portion and an insulating part, wherein the fuse portion is positioned between the first connecting portion and the second connecting portion, and is connected to the first connecting portion and the second connecting portion; and after the fuse portion is fused, a first disconnected portion and a second disconnected portion spaced apart from each other are formed. The insulating part is configured to fix the first disconnected portion and the second disconnected portion so as to stabilize the fused fuse portion and to avoid secondary contact between the first disconnected portion and the second disconnected portion caused by the shake of the battery, thereby improving the safety of the battery.

Description

Adapters, Secondary Batteries and Battery Modules

technical field

The invention relates to the technical field of secondary batteries, in particular to a transfer sheet, a secondary battery and a battery module.

Background technique

With the development of society, secondary batteries are used more and more widely. The secondary battery refers to a battery that can be used continuously by activating the active material by charging after the battery is discharged.

technical problem

The adapter sheet of the secondary battery in the prior art is used to connect the corresponding electrode lead-out terminal on the top cover and the corresponding tab on the battery core. There is a fuse position on the adapter sheet. When the cell is short-circuited or overcharged and overdischarged, the heat generated by the fuse position is relatively high, so it is blown first. However, the fused adapter sheet is prone to two problems due to the shaking of the battery. There are certain security risks.

technical solutions

The present application provides an adapter sheet, a secondary battery and a battery module, so as to solve the problem that the fused adapter sheet is prone to secondary contact in the prior art.

In a first aspect, the present application provides an adapter piece, comprising: a first connection part, a fuse part, a second connection part and an insulating member;

the fuse part is located between the first connection part and the second connection part, and connects the first connection part and the second connection part;

The fusing part forms a first disconnecting part and a second disconnecting part spaced apart after fusing;

The insulating member is used for fixing the first disconnection portion and the second disconnection portion.

In some possible implementations, the melting point of the insulating member is greater than the melting point of the fuse portion.

In some possible implementations, the insulating member is connected to at least two ends of the fuse portion.

In some possible implementations, the insulating member includes a first portion that is attached to and connected to the fuse portion.

In some possible implementations, the insulating member further includes two second parts respectively connected to two sides of the first part, and accommodating grooves are provided in the two second parts for accommodating the two second parts. The side surface of the fuse part or the side surfaces of the first connecting part and the second connecting part are accommodated.

In some possible implementations, the cross-sectional area of the fuse portion is smaller than the cross-sectional area of the first connection portion, and is smaller than the cross-sectional area of the second connection portion.

In some possible implementations, two open grooves are formed on two sides of the fuse portion with the first connecting portion and the second connecting portion respectively, and the insulating member further includes a Corresponding to the two filling parts of the two opening grooves.

In some possible implementations, the insulating member further includes a third portion located on a side of the fuse portion away from the first portion and connected to the two second portions.

In some possible implementations, the insulating member is connected to the first connection portion and the second connection portion.

In some possible implementations, the insulating member is a ceramic insulating member.

In some possible implementations, the insulating member is a metal oxide film.

In some possible implementations, the metal oxide film is provided on the fuse portion and integrally formed with the fuse portion.

In some possible implementations, the insulator has a resistance greater than 200 megohms.

In a second aspect, the present application further provides a secondary battery, including the above-mentioned transfer sheet.

In a third aspect, the present application further provides a battery module including a plurality of the above secondary batteries.

beneficial effect

The adapter sheet provided by the present application includes a first connection part, a fuse part, a second connection part and an insulating member. The fuse part is located between the first connection part and the second connection part and connects the first connection part and the second connection part , the fuse part forms a first disconnection part and a second disconnection part arranged at intervals after fusing, and the insulating member is used to fix the first disconnection part and the second disconnection part, so as to stabilize the fusing part after fusing, avoid The first disconnection portion and the second disconnection portion are in secondary contact due to the shaking of the battery, thereby improving the safety of the battery.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic diagram of an adapter sheet provided by an embodiment of the present application;

Fig. 2 is the bottom view schematic diagram of the adapter sheet provided by the embodiment of the present application;

3 is a schematic bottom view of the fuse part of the adapter sheet provided in the embodiment of the present application after disconnection;

4 is a schematic diagram of a first connection part, a fuse part and a second connection part of an adapter sheet provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of an insulating member of an adapter sheet provided in an embodiment of the present application.

BEST MODE FOR CARRYING OUT THE INVENTION

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation shown in the drawings Or the positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

The adapter sheet of the present application can be used in secondary batteries to connect the corresponding electrode lead-out terminals on the top cover and the corresponding tabs on the battery core. When the battery core is short-circuited or overcharged and overdischarged, the heat generated by the fuse part The first disconnection part and the second disconnection part are formed at intervals, and the insulating member fixes the first disconnection part and the second disconnection part, so as to stabilize the fusing part after being blown and avoid the first disconnection part and the second disconnection part. The disconnection part and the second disconnection part make secondary contact due to the shaking of the battery, thereby improving the safety of the battery.

Referring to FIGS. 1 to 5 , an embodiment of the present application provides an adapter sheet, including: a first connecting portion 1 , a fuse portion 2 , a second connecting portion 3 and an insulating member 4 ;

The fuse part 2 is located between the first connection part 1 and the second connection part 3, and connects the first connection part 1 and the second connection part 3;

The fuse portion 2 forms a first break portion 21 and a second break portion 22 arranged at intervals after being blown;

The insulating member 4 is used to fix the first disconnection portion 21 and the second disconnection portion 22 .

It should be noted that when the cell is short-circuited or overcharged and overdischarged, the heat generated by the fuse part 2 is relatively high and fuse occurs, forming the first disconnection part 21 and the second disconnection part 22 which are arranged at intervals, through the insulating member 4 The first disconnection portion 21 and the second disconnection portion 22 are fixed, so as to stabilize the fusing portion 2 after being blown, so as to prevent the first disconnection portion 21 and the second disconnection portion 22 from making secondary contact due to the shaking of the battery, and further Improve battery safety.

In this embodiment, the first connection part 1 can be connected to the corresponding electrode lead-out terminal on the top cover of the battery, and the second connection part 3 can be connected to the corresponding electrode tab on the cell of the battery. When the electrode lead-out terminal is a positive pole, the material of the first connection part 1, the fuse part 2 and the second connection part 3 can be aluminum; when the electrode lead-out terminal is a negative pole, the first connection part 1, the fuse part 2 and the second The material of the two connecting parts 3 can be copper.

In this embodiment, the first connection part 1 , the fuse part 2 and the second connection part 3 can be integrally formed, so as to improve the strength of the adapter sheet.

In some embodiments, the resistance of the insulating member 4 is greater than 200 megohms, especially when the battery can provide a voltage of about 200V, the resistance of the insulating member 4 is greater than 200 megohms, so as to ensure the insulating performance of the insulating member 4 and prevent fusing The rear adapter sheet conducts electricity through the insulating member 4, thereby improving the safety of the battery.

In some embodiments, the melting point of the insulating member 4 is greater than the melting point of the fuse portion 2 . When the cell is short-circuited or overcharged and overdischarged, the high heat generated by the fuse part 2 may be transferred to the insulating member 4. Therefore, in order to prevent the insulating member 4 from being melted or fused, the melting point of the insulating member 4 is set to be greater than the melting point of the fuse portion 2. , the insulating member 4 can always fix the first disconnection portion 21 and the second disconnection portion 22, so as to stabilize the fusing portion 2 after being blown, and prevent the first disconnection portion 21 and the second disconnection portion 22 from being damaged by the battery. Shaking produces secondary contact, thereby improving the safety of the battery.

In this embodiment, the insulating member 4 is a ceramic insulating member. Since the melting point of the ceramic material is relatively high, the melting point is basically above 2000 ° C, which is much higher than the melting point of the metal material commonly used in the adapter. For example, the melting point of aluminum is 660 ° C, and the melting point of copper is 660 ° C. The melting point of zinc is 1083°C, and the melting point of zinc is 419°C. Therefore, the use of ceramic materials to make the insulating member 4 can ensure that the melting point of the insulating member 4 is greater than the melting point of the fuse part 2, and prevent the insulating member 4 from being blown after the fuse part 2. melted or blown.

In this embodiment, the plasma process can be used to manufacture the ceramic insulator to improve the adhesion strength of the ceramic insulator to the first connection part 1, the fuse part 2 and/or the second connection part 3, to prevent the insulator 4 from falling off, thereby improving the insulation The fixing effect of the piece 4 on the first disconnecting portion 21 and the second disconnecting portion 22 after the fusing portion 2 is fused. Of course, other manufacturing processes can also be used to manufacture ceramic insulating parts, such as extrusion, cold isostatic pressing, hot pressing, and hot isostatic pressing, which are not limited in this application. In addition, the thickness of the ceramic insulating member can be specifically set according to the actual situation, for example, 0.01mm-0.5mm, which is not limited in this application.

Further, the insulating member 4 may be an alumina ceramic insulating member. That is, the insulating member 4 is made of alumina ceramic material. Alumina ceramic is a special ceramic with a high melting point of 2050°C, high strength, low cost and light weight, which can be stabilized even when the battery is shaken violently. The blown fuse portion 2 can also reduce the overall weight of the battery. Of course, the insulating member 4 can also be made of other ceramic materials, such as beryllium oxide ceramics or zirconia ceramics, which are not limited in this application.

In this embodiment, the insulating member 4 is connected to at least two ends of the fuse part 2, so that after the fuse part 2 is blown, the first disconnection part 21 and the second disconnection part 22 can be always fixed to avoid the first disconnection The part 21 and the second disconnection part 22 are in secondary contact due to the shaking of the battery.

Further, please refer to FIG. 1 to FIG. 3 and FIG. 5 , the insulating member 4 includes a first portion 41 that is attached and connected to the fuse portion 2 . For example, the first portion 41 can be attached to the top surface of the fuse portion 2 , thereby improving the insulation. The adhesion strength between the part 4 and the fuse part 2 can be improved to prevent the insulating part 4 from falling off, thereby improving the fixing effect of the insulating part 4 on the first disconnection part 21 and the second disconnection part 22 after the fuse part 2 is fused.

In this embodiment, please refer to FIG. 1 , the first part 41 is also attached and connected to the top surface of part of the first connecting part 1 , thereby further improving the adhesion strength of the insulating member 4 and the first connecting part 1 , preventing the insulating member 4 Falling off further improves the fixing effect of the insulating member 4 on the first disconnection portion 21 and the second disconnection portion 22 after the fuse portion 2 is fused.

In addition, please refer to FIG. 1 and FIG. 4 , the part of the top surface of the first connecting part 1 that is not in contact with the first part 41 is further provided with a plurality of grooves 11 , because the first connecting part 1 can be connected to the electrode through the laser to lead out the terminal For welding, the plurality of grooves 11 can reduce the reflection of the laser light, so as to improve the welding effect.

Further, referring to FIG. 1 , the first part 41 is also attached and connected to the top surface of part of the second connecting part 3 , thereby further improving the adhesion strength of the insulating member 4 and the second connecting part 3 , preventing the insulating member 4 from falling off, and further The fixing effect of the insulating member 4 on the first disconnection portion 21 and the second disconnection portion 22 after the fusing portion 2 is blown is improved.

Further, the insulating member 4 further includes two second portions 42 respectively connected to both sides of the first portion 41 , and both second portions 42 are provided with accommodating grooves 421 for accommodating the sides of the fuse portion 2 or accommodating The side surfaces of the first connecting part 1 and the second connecting part 3 . That is, the side surfaces of the fuse part 2 can be directly covered by the two second parts 42, and the side surfaces of the first connection part 1 and the second connection part 3 can also be directly covered. Or the side surfaces of the first connecting part 1 and the second connecting part 3 are connected, thereby improving the adhesion strength of the insulating member 4 and the fuse part 2, or with the first connecting part 1 and the second connecting part 3, preventing the insulating member 4 from falling off, and then The fixing effect of the insulating member 4 on the first disconnection portion 21 and the second disconnection portion 22 after the fusing portion 2 is blown is improved.

In this embodiment, please refer to FIG. 4 , the cross-sectional area of the fuse portion 2 is smaller than the cross-sectional area of the first connecting portion 1 and smaller than the cross-sectional area of the second connecting portion 3 . The cross section refers to a cross section in the width direction. When the cell is short-circuited or overcharged and overdischarged, when the current passes through the fuse part 2, the heat generated by the fuse part 2 is higher than the heat generated by the first connection part 1 and the second connection part 3, so that the first connection part 1 and the second connection part 3 are blown. Open the adapter for insurance.

Further, the fuse portion 2 can also be provided with at least one slot along the width direction, which can further reduce the width of the fuse portion 2 to ensure that when the cell is short-circuited or overcharged and over-discharged, the fuse portion 2 is blown first, and also It can ensure that the fuse part 2 is blown at the position with the slot, prevent the fuse part 2 from fuse at the edge position close to the first connection part 1 or the edge position close to the second connection part 3, and ensure that the fuse part 2 can form the first fuse after the fuse part 2 is blown. The opening portion 21 and the second disconnecting portion 22 .

In this embodiment, please refer to FIGS. 2 to 5 , when the second part 42 accommodates the side surfaces of the first connecting part 1 and the second connecting part 3 , the cross-sectional area of the fuse part 2 is smaller than that of the first connecting part 1 and the second connecting part 3 . The cross-sectional area of the second connecting portion 3, the two sides of the fuse portion 2 respectively form two opening slots 23 with the first connecting portion 1 and the second connecting portion 3, and the insulating member 4 also includes two corresponding opening slots 23 connected to the first portion 41. The two filling parts 43 of each opening slot 23, and the shape and size of the filling part 43 can be the same as the shape and size of the opening slot 23, so that the two filling parts 43 completely fill the two opening slots 23 to resist the fuse part 23. After the fuse part 2 is blown, the two filling parts 43 can further stabilize the first disconnection part 21 and the second disconnection part 22, and improve the insulation member 4 after the fuse part 2 is blown. The fixing effect of the two disconnecting parts 22 .

Further, referring to FIG. 2 , FIG. 3 and FIG. 5 , the insulating member 4 further includes a third portion 44 located on the side of the fuse portion 2 away from the first portion 41 and connected with the two second portions 42 , so that the insulating member 4 can be insulated The layer 4 covers at least part of the fuse portion 2 , further preventing the insulating member 4 from falling off, and further improving the fixing effect of the insulating member 4 on the first breaking portion 21 and the second breaking portion 22 after the fuse portion 2 is fused.

In this embodiment, the third portion 44 is attached and connected to at least part of the bottom surface of the fuse portion 2 , so as to further improve the adhesion strength between the insulating member 4 and the fuse portion 2 . In addition, the third part 44 is also attached to and connected to the bottom surface of the first connection part 1 and/or the second connection part 3 , thereby further improving the adhesion strength of the insulating member 4 and the first connection part 1 and/or the second connection part 3 .

In this embodiment, the top surface of the fuse part 2 is flush with the top surfaces of the first connection part 1 and the second connection part 3 , and the bottom surface of the fuse part 2 is flush with the bottom surfaces of the first connection part 1 and the second connection part 3 so that the surfaces of the fuse part 2, the first connection part 1 and the second connection part 3 are flat, which is beneficial for the insulator 4 to fit with the fuse part 2, the first connection part 1 and the second connection part 3, and improves the insulation performance. 4. The adhesion strength with the fuse part 2, the first connection part 1 and the second connection part 3 can prevent the insulating member 4 from falling off, thereby improving the insulation member 4 to the first disconnection part 21 and the second disconnection part 2 after the fuse part 2 is blown. The fixing effect of the opening 22.

In some embodiments, the insulating member 4 may be a metal oxide film. Since the fuse part 2 is a metal material, the melting point of the metal oxide is higher than the melting point of the metal. The melting point of zinc is 419° C., and the melting point of zinc oxide is 1975° C. Therefore, it can be ensured that the melting point of the insulating member 4 is greater than the melting point of the fuse portion 2 , so as to prevent the insulating member 4 from melting or fusing after the fuse portion 2 is fused.

Further, the metal oxide film is provided on the fuse portion 2 and is integrally formed with the fuse portion 2, that is, the insulating member 4 is a metal oxide film formed after the surface of the fuse portion 2 is oxidized, and is formed by oxidizing the surface of the fuse portion 2. A layer of metal oxide film can ensure that the melting point of the insulating member 4 is greater than the melting point of the fuse portion 2, so as to prevent the insulating member 4 from melting or fusing after the fuse portion 2 is blown, and the surface of the fuse portion 2 is oxidized to form metal oxides The surface adhesion strength of the film to the fuse portion 2 is high, which can prevent the insulating member 4 from falling off, thereby further improving the fixing effect of the insulating member 4 on the first breaking portion 21 and the second breaking portion 22 after the fuse portion 2 is fused.

Further, the oxide film may be an aluminum oxide film. That is, the material of the fuse portion 2 of the present application is preferably aluminum, and the aluminum oxide film is formed after the aluminum is oxidized. Since the melting point of aluminum is 660° C., the melting point of aluminum oxide is 2054° C. Therefore, it can be ensured that the melting point of the insulating member 4 is greater than the melting point of the fuse portion 2, so as to prevent the insulating member 4 from being melted or blown after the fuse portion 2 is fused.

In this embodiment, a chemical oxidation method, an alkaline oxidation method, an acid oxidation method or an anodization method can be used to oxidize the surface of the fuse part 2 to form an oxide film, so as to improve the adhesion strength of the oxide film and the fuse part 2 and prevent oxidation The film falls off, thereby further avoiding secondary contact of the fused adapter sheet due to the shaking of the battery.

In addition, in order to prevent the first connection part 1 and the second connection part 3 from being oxidized, when the surface of the fuse part 2 is oxidized, a shielding layer can be formed on the first connection part 1 and the second connection part 3, for example After the ink finishes oxidizing the surface of the fusing portion 2, the shielding layer is removed. In addition, the thickness of the metal oxide film can be specifically fabricated according to the actual situation, for example, 0.01mm-0.5mm, which is not limited in this application.

In some embodiments, the insulating member 4 may not be in contact with the fuse part 2, but the insulating member 4 may be connected with the first connecting part 1 and the second connecting part 3, and when the cell is short-circuited or overcharged and overdischarged, the fuse is blown. The heat generated by the part 2 is relatively high and the fuse is generated, forming the first disconnection part 21 and the second disconnection part 22 arranged at intervals, and the first connection part 1 and the second connection part 3 are fixed by the insulating member 4, so as to be fixed. The first disconnection portion 21 and the second disconnection portion 22 further stabilize the fused fuse portion 2 to avoid secondary contact between the first disconnection portion 21 and the second disconnection portion 22 due to the shaking of the battery, thereby improving the battery performance. security.

In this embodiment, when the cells are short-circuited or overcharged and overdischarged, the high heat generated by the fuse portion 2 will not be fully transferred to the insulating member 4, so the melting point of the insulating member 4 may not be greater than the melting point of the fuse portion 2. The material of 4 only needs to be a material with sufficient strength, for example, a ceramic material, a high-strength plastic or a high-strength resin, which is not limited in this application.

Based on the above-mentioned adapter sheet, an embodiment of the present application further provides a secondary battery, which includes the above-mentioned adapter sheet. When the cell is short-circuited or overcharged and overdischarged, the heat generated by the fuse part 2 is relatively high and fuse occurs, forming a first disconnection part 21 and a second disconnection part 22 arranged at intervals, and the first disconnection part 22 is fixed by the insulating member 4 The opening part 21 and the second disconnecting part 22 can stabilize the fused fuse part 2 and prevent the first disconnecting part 21 and the second disconnecting part 22 from making secondary contact due to the shaking of the battery, thereby improving the safety of the battery. .

Based on the above-mentioned secondary battery, an embodiment of the present application further provides a battery module including a plurality of the above-mentioned secondary batteries. When the cell is short-circuited or overcharged and overdischarged, the heat generated by the fuse part 2 is relatively high and fuse occurs, forming a first disconnection part 21 and a second disconnection part 22 arranged at intervals, and the first disconnection part 22 is fixed by the insulating member 4 The opening part 21 and the second disconnecting part 22 can stabilize the fusing part 2 after being blown, and prevent the first disconnecting part 21 and the second disconnecting part 22 from making secondary contact due to the shaking of the battery, thereby improving the stability of the battery module. safety.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the above detailed description of other embodiments, and details are not repeated here.

During specific implementation, the above components or structures can be implemented as independent entities, or can be arbitrarily combined to be implemented as the same or several entities. The specific implementation of the above components or structures can refer to the previous embodiments. Repeat.

A transition piece, a secondary battery and a battery module provided by the embodiments of the present invention have been described in detail above. The principles and implementations of the present invention are described with specific examples in this paper. The descriptions of the above embodiments are only It is used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scope. In summary, this specification The contents should not be construed as limiting the present invention.

Claims

An adapter plate, characterized in that it comprises: a first connecting part, a fuse part, a second connecting part and an insulating member;

the fuse part is located between the first connection part and the second connection part, and connects the first connection part and the second connection part;

The fusing part forms a first disconnecting part and a second disconnecting part spaced apart after fusing;

The insulating member is used for fixing the first disconnection portion and the second disconnection portion.
The transition piece according to claim 1, wherein the melting point of the insulating member is greater than the melting point of the fuse portion.
The adapter plate according to claim 2, wherein the insulating member is connected to at least two ends of the fuse portion.
The adapter sheet according to claim 3, wherein the insulating member comprises a first portion attached to and connected to the fuse portion.
The adapter plate according to claim 4, wherein the insulating member further comprises two second parts respectively connected to both sides of the first part, and both of the two second parts are provided with The accommodating groove is used for accommodating the side surface of the fuse part or the side surface of the first connecting part and the second connecting part.
The adapter plate according to claim 5, wherein the cross-sectional area of the fuse portion is smaller than the cross-sectional area of the first connection portion, and is smaller than the cross-sectional area of the second connection portion.
The adapter plate according to claim 6, wherein two sides of the fuse part and the first connection part and the second connection part respectively form two open slots, and the insulating member further comprises a The first part is connected to and corresponds to the two filling parts of the two opening grooves.
The adapter plate of claim 5, wherein the insulating member further comprises a third portion located on a side of the fuse portion away from the first portion and connected to the two second portions.
The adapter plate according to claim 1, wherein the insulating member is connected to the first connecting portion and the second connecting portion.
The adapter plate according to claim 2 or 9, wherein the insulating member is a ceramic insulating member.
The adapter plate of claim 2, wherein the insulating member is a metal oxide film.
The transition piece according to claim 11, wherein the metal oxide film is provided on the fuse portion and integrally formed with the fuse portion.
The adapter plate of claim 1, wherein the resistance of the insulating member is greater than 200 megohms.
A secondary battery, characterized by comprising the transfer sheet according to any one of claims 1 to 13.
A battery module is characterized by comprising a plurality of secondary batteries as claimed in claim 14 .