WO2018196506A1

WO2018196506A1 - Electrode lead-out sheet and battery

Info

Publication number: WO2018196506A1
Application number: PCT/CN2018/079542
Authority: WO
Inventors: 蒋露霞; 胡世超; 杨珂利; 鲁鹏; 朱建华
Original assignee: 比亚迪股份有限公司
Priority date: 2017-04-28
Filing date: 2018-03-20
Publication date: 2018-11-01
Also published as: CN108807827A

Abstract

Provided is an electrode lead-out sheet, comprising a body portion and a fuse portion located on the body portion. A cross-sectional area of the fuse portion in a width direction of the electrode lead-out sheet is smaller than a cross-sectional area of the body portion in the width direction of the electrode lead-out sheet, wherein the electrode lead-out sheet is provided with a heat pipe disposed adjacent to the fuse portion. Meanwhile, the present invention also provides a battery comprising the electrode lead-out sheet provided by the present invention. According to the electrode lead-out sheet provided in present invention, a heat pipe is disposed on a portion of the body portion adjacent to the fuse portion. When the battery is working normally, in the process of normal overcurrent, although there will be a certain temperature rise due to small overcurrent area and a large resistance value in the fuse portion, with the help of the heat pipe, this part of heat can be timely and quickly emitted, so as to timely dissipate heat, reduce the temperature, and eliminate the influence on the normal use of the battery caused by the temperature rise, and to avoid the abnormal fusing of the fuse portion in normal work.

Description

Electrode lead-out sheet and battery

The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No .

Technical field

The present invention relates to the field of batteries, and in particular to an electrode lead-out sheet and a battery including the battery lead-out sheet.

Background technique

In order to make the battery more secure during use, in the prior art, a large current fusing structure is often provided on the electrode lead-out piece of the battery, that is, a fuse portion is provided on the electrode lead-out piece.

Although the fuse portion is blown under the condition of a large current, it plays a role in ensuring the safety of the battery; however, since the fuse portion has a small cross-sectional area, the local internal resistance is large, and the overcurrent capability is poor, which causes the battery to be in a normal current. During the use process, a large temperature rise will also occur locally, which not only affects the normal use of the battery, but also seriously affects the service life of the battery and adversely affects the battery.

Summary of the invention

The object of the present invention is to provide an electrode lead-out sheet, which is intended to solve the problem that the electrode lead-out piece with a fuse portion in the prior art is used in a normal current range, and the current temperature of the battery is increased due to poor overcurrent capability of the fuse portion. , technical problems affecting the normal use of the battery.

In order to achieve the above object, the technical solution of the present invention is:

An electrode lead-out piece comprising a body portion and a fuse portion on the body portion, the cross-sectional area of the fuse portion in the width direction of the electrode lead-out sheet being smaller than the width direction of the body portion in the electrode lead-out sheet A cross-sectional area, wherein the electrode lead-out piece is provided with a heat pipe disposed adjacent to the fuse portion.

In some embodiments of the invention, the heat pipe is insulated from the electrode lead-out piece.

In some embodiments of the invention, the outer surface of the heat pipe is covered with an insulating thermally conductive layer.

In some embodiments of the invention, the heat pipe extends along a length of the body portion.

In some embodiments of the invention, the heat pipe includes a casing and a vacuum chamber within the casing, and an inner wall of the casing is provided with a wick.

In some embodiments of the invention, the heat pipe is a flat tube, the broad face of the flat tube being attached to the electrode take-up piece.

In some embodiments of the invention, one or both sides of the electrode lead tab are provided with a heat pipe.

In some embodiments of the present invention, the body portion includes a connecting portion and a drain portion, the fuse portion is located on the connecting portion; the fuse portion includes a first fuse portion and a second fuse portion along the electrode a hollow portion is disposed between the first fuse portion and the second fuse portion in the strip width direction; and the heat pipe is connected from the hollow portion to a side of the drain portion along the length direction of the electrode lead-out piece Extending to the drain.

In some embodiments of the present invention, a distance of 1 mm or more between the heat pipe and the first fuse portion and/or between the heat pipe and the second fuse portion is left along the width direction of the electrode lead-out piece. gap.

In some embodiments of the invention, the body portion includes a connecting portion and a drain portion, the fuse portion is located on the drain portion, and the heat pipe is disposed on the drain portion.

In some embodiments of the invention, a gap of 1 mm or more is left between the heat pipe and the fuse portion.

The present invention also provides a battery including a housing, a cover assembly sealing the housing, a battery core housed in the cavity formed by the cover assembly and the housing, and an electrode take-up piece, the cover assembly a positive electrode terminal and a negative electrode terminal are disposed, the positive electrode terminal is electrically connected to the positive electrode of the battery cell through a first electrode lead-out piece, and the negative electrode terminal and the negative electrode of the battery core are passed through a second electrode lead-out piece The electrical connection, wherein at least one of the first electrode lead-out piece and the second electrode lead-out piece is the electrode lead-out piece provided by the present invention.

Advantageous Effects of Invention: The electrode lead-out piece provided by the present invention is provided with a heat pipe at a position adjacent to the fuse portion on the body portion, and during normal operation of the battery, although the fuse portion is small due to a flow area, the resistance is small. The value is large, and a certain temperature rise is generated; however, the heat pipe can quickly and quickly derive this part of the heat, timely dissipate heat, reduce the temperature, and eliminate the influence of the temperature rise on the normal use of the battery, and avoid the fuse portion in the normal state. Abnormally blown during work. At the same time, in the case of extremely high current such as short circuit, because the temperature rises faster, the heat pipe can not transmit and dissipate heat in a short time and high temperature, and the fuse can still work normally, and extremely high current in short circuit. In the case of blowing, it plays a role in protecting the safety of the battery.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a schematic view showing the overall structure of a battery provided by the present invention.

2 is a schematic view showing the overall structure of an electrode lead-out piece and a cover plate in which a heat pipe is not disposed in an embodiment provided by the present invention.

Fig. 3 is a side elevational view showing the overall structure of an electrode lead piece and a cover plate in which a heat pipe is disposed in an embodiment of the present invention.

4 is a schematic view showing the overall structure of an electrode lead piece and a cover plate in which a heat pipe is disposed in an embodiment of the present invention.

FIG. 5 is a schematic view showing the overall structure of an electrode lead-out piece and a cover plate in which a heat pipe is not disposed in another embodiment provided by the present invention.

Fig. 6 is a side elevational view showing the overall structure of an electrode lead piece and a cover plate in which a heat pipe is disposed in another embodiment of the present invention.

Fig. 7 is a schematic view showing the overall structure of an electrode lead-out piece and a cover plate in which a heat pipe is disposed in another embodiment of the present invention.

Figure 8 is a schematic cross-sectional view of a heat pipe provided by the present invention.

The reference numerals include:

Electrode lead-out piece 10; body portion 101; connecting portion 1011; drain portion 1012; fuse portion 102; first fuse portion 1021; second fuse portion 1022; hollow portion 103; heat pipe 20; package 201; vacuum chamber 202; Core 203; insulating and thermally conductive layer 30; housing 40; cover plate assembly 50; positive terminal 51; negative terminal 52.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplified and are not intended to limit the invention.

The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or integrated; can be directly connected, or indirectly connected through an intermediate medium, which can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

The present invention provides an electrode take-up piece 10 comprising a body portion 101 and a fuse portion 102 on the body portion 101. The cross-sectional area of the fuse portion 102 in the width direction of the electrode lead-out piece 10 is smaller than that of the body portion 101 at the electrode lead-out piece 10. The cross-sectional area in the width direction; thus, when a short circuit or the like occurs, a large current passes through the fuse portion 102 having a small cross-sectional area, and since the internal resistance of the fuse portion 102 is large, a large amount of heat is generated and blown, thereby achieving power-off. Function to protect battery safety.

As shown in FIG. 2 or FIG. 5, the width direction of the electrode lead-out piece 10 coincides with the width direction of the cover plate, and is a direction perpendicular to the longitudinal direction of the body portion mentioned later and parallel to the surface of the upper cover of the battery; In the middle, the hollow portion 103 has an elongated shape extending in the width direction of the electrode lead piece 10. As will be described hereinafter, the longitudinal direction of the main body portion 101 is the up-and-down direction in FIG. 3 or FIG. 6, and of course, the drainage portion 1012 in FIG. 3 or FIG. 6 is in the up-and-down direction, that is, the longitudinal direction; and the upper end of the drainage portion 1012 is formed by bending. The connecting portion 1011 is obtained by extending the drain portion 1012 in the longitudinal direction thereof. Therefore, the left-right direction of the connecting portion 1011 in FIG. 3 or FIG. 6 is also regarded as the longitudinal direction of the main body portion 101.

The manner in which the heat pipe 20 is fixed on the electrode lead-out piece 10 may be a possible connection manner such as welding, pasting or mechanical connection; as long as the connection mode can fix the heat pipe 20 and the electrode lead-out piece 10 fixedly, the heat conduction path is effectively established, and it is not easy at the same time. The connection may be invalid due to the internal environment of the battery.

As shown in FIG. 4 or FIG. 7 , the electrode lead-out piece 10 provided by the present invention is provided with a heat pipe 20 disposed adjacent to the fuse portion 102 . In the present invention, the proximity of the fuse portion 102 means that the heat pipe 20 is relatively close to the fuse portion 102, so that heat generated around the fuse portion 102 can be transferred to the heat pipe 20; at the same time, the heat pipe 20 does not contact or cover the fuse portion 102, Therefore, the fuse portion 102 is not blown under extreme current such as a short circuit. Specifically, as shown in FIG. 4, the side of the heat pipe 20 is disposed adjacent to the first fuse portion 1021 and the second fuse portion 1022; as shown in FIG. 7, the top end of the heat pipe 20 is disposed adjacent to the fuse portion 102.

In the present invention, the heat pipe 20 is disposed on the body portion 101 adjacent to the fuse portion 102. During normal operation of the battery, during the normal overcurrent, although the fuse portion 102 has a small overcurrent area, the resistance value is large. , a certain temperature rise is generated; however, the heat pipe 20 can quickly and quickly derive this part of heat, timely dissipate heat, reduce the temperature, and also eliminate the influence of the temperature rise on the normal use of the battery, and prevent the fuse portion 102 from working normally. Abnormally blown.

In the present invention, in order to enable good heat conduction between the periphery of the fuse portion 102 and the heat pipe 20, and to insulate between the heat pipe 20 and the electrode lead-out piece 10, there is no risk of poor heat transfer or short-circuit of the electrical connection. An insulating and thermally conductive layer 30 is disposed between the heat pipe 20 and the electrode take-up piece 10.

In some embodiments of the present invention, in order to facilitate processing and manufacturing, and to improve the good insulation and heat conduction between the heat pipe 20 and the electrode lead-out sheet 10, the outer surface of the heat pipe 20 is covered with an insulating heat conductive layer 30, such as Figure 8 shows. That is, in the process of fabricating the heat pipe 20, an insulating heat conducting layer 30 is simultaneously prepared on the outer surface of the heat pipe 20; in some specific embodiments, as shown in Fig. 8, the heat pipe 20 is made to be included from the inside to the outside. The multilayer structure of the vacuum chamber 202, the wick 203, the envelope 201, and the insulating and thermally conductive layer 30.

In order to maximize the heat dissipation of the heat around the fuse portion 102, the internal space of the battery is utilized reasonably. In some embodiments, the heat pipe 20 is formed into a strip shape, and the heat pipe 20 extends along the length of the body portion 101, as shown in FIG. Figure 4, Figure 6, or Figure 7. The specific extension manner and the cooperation relationship with the body portion 101 and the fuse portion 102 can be adaptively designed according to the arrangement of the body portion 101 and the arrangement of the heat pipe 20. Two designs will be exemplified in the following two embodiments. Example.

Of course, the above heat pipe arrangement is only one embodiment of the present invention; in addition to extending in the length direction, it is possible to extend in other directions or curves.

As shown in FIG. 8, the heat pipe 20 used in the present invention includes a casing 201 and a vacuum chamber 202 in the casing 201, and a liquid wick 203 is disposed on the inner wall of the casing 201.

The heat pipe 20 performs heat transfer by gas-liquid phase change. Specifically, the liquid in the heat pipe and the body on the side of the body portion absorbs heat and then changes from a liquid state to a gas state to vaporize; when the steam flows to the other side with a low temperature, it is cold. Liquefaction, release heat, and achieve efficient heat transfer. The heat pipe 20 has a thermal conductivity of up to 10^6 W/(m*K), and is a metal material such as copper (380-403 W/(m*°C)) and aluminum (thermal conductivity 124-148 W (m*°C)). 10^2~10^3 times, which can greatly improve the heat dissipation capability of the entire module.

In order to increase the contact surface between the heat pipe 20 and the body portion 101, heat transfer can be performed more efficiently; at the same time, the occupation of the internal space of the battery is saved. In some embodiments of the present invention, the heat pipe 20 is a flat tube or a flat tube. The wide face is attached to the electrode lead piece 10.

Alternatively, the heat pipe 20 may be disposed on one side or both sides of the electrode lead piece 10.

As shown in FIG. 2 to FIG. 4, in one embodiment of the present invention, the body portion 101 includes a connecting portion 1011 and a drain portion 1012, and the fuse portion 102 is located on the connecting portion 1011; the fuse portion 102 includes a fuse portion 1021 and a second fuse portion 1022 are disposed along the width direction of the electrode lead-out piece 10, and a hollow portion 103 is disposed between the first fuse portion 1021 and the second fuse portion 1022; In the direction, the heat pipe 20 extends from a side of the hollow portion 103 away from the drain portion 1012 to the drain portion 1012.

In the present embodiment, the fuse portion 102 is provided on the connecting portion 1011; more specifically, a long through hole extending in the width direction of the electrode lead-out piece 10 is formed on the connecting portion 1011 by means of punching or die forming or the like. That is, the hollow portion 103 mentioned in the embodiment; on the connecting portion 1011, the elongated through hole has a fuse portion 102 whose outer side is flush with the connecting portion 1011 at both ends in the width direction of the electrode lead-out piece 10, That is, the first fuse portion 1021 and the second fuse portion 1022. As shown in FIG. 4, the connecting portion 1011 is divided into two portions by the hollow portion 103, and the two portions are connected by the first fusing portion 1021 and the second fusing portion 1022.

Along the longitudinal direction of the electrode lead piece 10, the heat pipe 20 extends from the connecting portion 1011 of the hollow portion 103 away from the side of the drain portion 1012 to the drain portion 1012. As shown in FIG. 4, a portion of the heat pipe 20 is disposed on the connecting portion 1011 and extends from the connecting portion 1011 to the drain portion 1012. Meanwhile, the hollow portion 103 is located below the heat pipe 20, or extends the heat pipe 20 through the hollow portion. 103.

In order to minimize the influence of the arrangement of the heat pipe 20 on the fuse portion 102 itself, along the width direction of the electrode lead-out piece 10, between the heat pipe 20 and the first fuse portion 1021 and/or the heat pipe 20 and the first A gap of 1 mm or more is left between the two fuse portions 1022.

As shown in FIG. 4, a gap of 1 mm or more is left between the heat pipe 20 and the first fuse portion 1021, and a gap of 1 mm or more is left between the heat pipe 20 and the second fuse portion 1022.

In the present embodiment, as shown in FIG. 4, the drain portion 1012 is divided into two portions arranged side by side to facilitate electrical connection and fixation of the drain portion 1012 with the battery cells. In this case, in order to cooperate with the drain portion 1012, the heat pipes 20 are disposed in two, and the two heat pipes 20 are respectively extended to the two portions of the drain portion 1012, that is, one portion of each portion of the drain portion 1012 is provided. The heat pipe 20 and the two heat pipes 20 are arranged side by side. One of the heat pipes 20 is disposed adjacent to the first fuse portion 1021, and the other heat pipe 20 is disposed adjacent to the second fuse portion 1022.

In the present embodiment, the connecting portion 1011 is used to connect with the positive terminal 51 or the negative terminal 52 to draw the internal current out of the battery.

As shown in FIGS. 5 to 7, in another embodiment provided by the present invention, the body portion 101 includes a connecting portion 1011 and a drain portion 1012, the fuse portion 102 is located on the drain portion 1012, and the heat pipe 20 is disposed at the draining portion. On the part 1012.

As shown in FIG. 5, the drain portion 1012 has through holes formed inwardly from both sides, and only the intermediate portion is connected by the fuse portion 102. The through hole may be formed by a mold, or both sides of the drain portion 1012 may be cut inward.

In order to minimize the influence of the arrangement of the heat pipe 20 on the fuse portion 102 itself, a gap of 1 mm or more is left between the heat pipe 20 and the fuse portion 102.

In the present embodiment, as shown in FIG. 7, the drain portion 1012 is divided into two portions arranged side by side to facilitate electrical connection and fixation of the drain portion 1012 with the battery cells. In this case, in order to cooperate with the drain portion 1012, the heat pipes 20 are disposed in two, and the two heat pipes 20 are disposed on two portions of the drain portion 1012, that is, each portion of the drain portion 1012 is provided with a heat pipe. 20, two heat pipes 20 are arranged side by side.

As shown in FIG. 7, in this embodiment, the heat pipe 20 has a gap of 1 mm or more between the one end of the fuse portion 102 and the fuse portion 102.

As shown in FIGS. 1 through 7, the present invention provides a battery including a housing 40, a cover assembly 50 sealing the housing 40, and a housing formed in the housing formed by the cover assembly 50 and the housing 40. a battery core and an electrode lead-out piece 10, wherein the cover plate assembly 50 is provided with a positive electrode terminal 51 and a negative electrode terminal 52, and the positive electrode terminal 51 and the positive electrode of the battery cell are electrically connected through the first electrode lead-out piece 10, The negative electrode terminal 52 and the negative electrode of the battery cell are electrically connected by the second electrode lead-out piece 10, wherein at least one of the first electrode lead-out piece 10 and the second electrode lead-out piece 10 is an electrode provided by the present invention Lead out the piece 10.

As in the above two embodiments, the first electrode lead-out piece 10 and the second electrode lead-out piece 10 each employ the electrode lead-out piece 10 provided by the present invention. In this way, the battery can be safely and normally used.

From the above, it can be seen that the present invention has the above-described excellent characteristics, and it has practicality in use, which has improved performance in the prior art, and has become a practical product.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

An electrode lead-out piece comprising a body portion and a fuse portion on the body portion, the cross-sectional area of the fuse portion in the width direction of the electrode lead-out sheet being smaller than the width direction of the body portion in the electrode lead-out sheet The cross-sectional area is characterized in that a heat pipe is disposed on the electrode lead-out piece, and the heat pipe is disposed adjacent to the fuse portion.
The electrode lead-out sheet according to claim 1, wherein the heat pipe is insulated from the electrode lead-out piece.
The electrode lead-out sheet according to claim 2, wherein an outer surface of the heat pipe is covered with an insulating heat conductive layer.
The electrode take-up piece according to claim 1, wherein the heat pipe extends in a length direction of the body portion.
The electrode lead-out sheet according to claim 1, wherein the heat pipe comprises a tube case and a vacuum chamber in the tube case, and an inner wall of the tube case is provided with a wick.
The electrode lead-out sheet according to claim 1, wherein the heat pipe is a flat tube, and a wide surface of the flat tube is attached to the electrode lead-out piece.
The electrode lead-out sheet according to claim 1, wherein one or both sides of the electrode lead-out piece are provided with a heat pipe.
The electrode take-up piece according to any one of claims 1 to 7, wherein the body portion includes a connecting portion and a drain portion, the fuse portion is located on the connecting portion; the fuse portion includes a first fuse And a second fuse portion along the width direction of the electrode lead-out piece, a hollow portion is disposed between the first fuse portion and the second fuse portion; the heat pipe is hollowed out along the length direction of the electrode lead-out piece A connecting portion on a side away from the drain portion extends to the drain portion.
The electrode lead-out sheet according to claim 8, wherein the heat pipe and the first fuse portion and/or the heat pipe and the second fuse portion are along the width direction of the electrode lead-out piece There is a gap of 1 mm or more between them.
The electrode take-up piece according to any one of claims 1 to 7, wherein the body portion includes a connecting portion and a drain portion, the fuse portion is located on the drain portion, and the heat pipe is disposed on the drain portion .
The electrode lead-out sheet according to claim 10, wherein a gap of 1 mm or more is left between the heat pipe and the fuse portion.
A battery comprising a housing, a cover assembly sealing the housing, a battery core housed in a cavity formed by the cover assembly and the housing, and an electrode lead-out piece, the cover assembly being provided with a positive terminal And a negative electrode terminal, wherein the positive electrode terminal and the positive electrode of the battery cell are electrically connected by a first electrode lead-out piece, and the negative electrode terminal and the negative electrode of the battery core are electrically connected by a second electrode lead-out piece, and the feature thereof The at least one of the first electrode lead-out sheet and the second electrode lead-out sheet is the electrode lead-out sheet according to any one of claims 1 to 11.