WO2018157651A1

WO2018157651A1 - Single battery, dual battery pack, and battery module

Info

Publication number: WO2018157651A1
Application number: PCT/CN2017/117410
Authority: WO
Inventors: 胡世超; 蒋露霞; 杨珂利; 鲁鹏; 王信月
Original assignee: 比亚迪股份有限公司
Priority date: 2017-02-28
Filing date: 2017-12-20
Publication date: 2018-09-07
Also published as: CN206650127U

Abstract

A single battery, a dual battery pack, and a battery module. The single battery is provided with at least one conductive protrusion (15) on the surface of a battery housing, the conductive protrusion (15) becoming deformed under the effects of temperature or pressure. When the interior of the battery is abnormal, the gas pressure in the interior of the battery increases, and the battery housing is deformed to expand outward. The conductive protrusion (15) of the surface of the battery housing contacts with the battery housing of an adjacent battery, causing the conductive electrode terminal (11) of the battery to form a short connection with the insulation electrode terminal (12) of the battery, such that the single battery generates a large current to fuse the part of the battery which has a weak connection and disconnect the connection point. The battery takes the temperature and pressure as triggering conditions to make the surface of the battery housing of the single battery contact with the adjacent battery, thereby causing the positive electrode and negative electrode of the battery to form the short circuit, so that a large current is generated to quickly release the internal energy of the battery, disconnect the part of the battery which has a weak connection, and prevent the battery from occurring thermal runaway, and thus it is able to effectively and timely protect the battery module.

Description

Single battery, dual battery pack and battery module

This application claims the priority of the Chinese patent application filed on February 28, 2017, the Chinese Patent Office, the application number is 201720188646.6, and the invention is entitled "a single battery, a dual battery pack and a battery module". The citations are incorporated herein by reference.

Technical field

The present application relates to the field of battery protection, and in particular, to a single battery, a dual battery, and a battery module.

Background technique

With the development of science and technology and the development of new energy technologies, new energy vehicles are receiving more and more attention and attention from the automotive industry. As a core component of new energy vehicles, battery safety is particularly important.

However, while the battery is widely used, it also faces some technical problems. When the battery is subjected to abuse conditions such as impact or overheating, a series of complex electrochemical reactions occur inside the battery. When these abnormalities are not effectively controlled, the battery may be in danger of igniting or even exploding when the battery is out of control.

In the prior art, for the thermal runaway problem of the battery, a technical solution is generally adopted. When the ambient temperature is higher than a predetermined temperature value, the breaking unit generates deformation and separates the conductive lead from the conductive terminal to cut off the circuit. The battery protection device can protect the battery by cutting the conductive lead and the conductive terminal by the deformation of the breaking unit when the battery is thermally out of control.

However, this method only cuts off the circuit when the battery is out of control. The energy and heat inside the battery are not reduced in time, and there is still a safety problem caused by thermal runaway inside the battery.

Summary of the invention

The present application aims to solve at least one of the above technical problems in the related art to some extent. To this end, the present application proposes a single battery, a dual battery pack, and a battery module, which can short-circuit the internal battery when the battery is abnormally thermally out of control, and generate a large current to blow the battery to connect the weak position to disconnect the connection point, thereby Protect the battery to avoid thermal runaway.

The present application provides a single cell, characterized in that the single cell comprises a sealed battery case, two polarity electrode terminals for extracting current inside the battery case, and the electrode terminal comprises a conductive electrode terminal electrically connected to the battery case, and an insulated electrode terminal insulated from the battery case, wherein the battery case surface is provided with at least one conductive protrusion portion, and when the temperature or pressure inside the battery case is made The conductive protrusions can be adjacent to the battery when the battery case and/or the conductive protrusion are deformed The battery case is electrically conductive.

In some embodiments, the surface of the battery case is provided with an insulating layer except for the area where the conductive protrusions are located.

In some embodiments, the conductive bumps are integrally formed with the battery housing.

In some embodiments, the conductive bumps are formed by a conductive element disposed on a surface of the battery housing.

In addition, the unit cell according to the present application may further have the following technical features, the sealed battery case includes a battery case body and a cover body; the cover body is electrically connected to the battery case body; The cover body is provided with two through holes for mounting the conduction electrode terminal and the insulated electrode terminal.

Further, the conductive electrode terminal and the cover body are sealed by a low-resistance conductive seal, and the insulated electrode terminal and the cover body are insulated and sealed by an insulating seal.

The present application provides a dual battery pack, the dual battery pack includes a first battery and a second battery, and at least one of the first battery and the second battery is a single battery, and the single battery is any of the above embodiments. In the single cell according to the invention, when the battery case internal temperature or pressure of the single cell in the dual battery pack deforms the battery case, the conductive protrusion portion can be combined with the double battery unit. The battery case electrical contact of the other battery electrically conducts the conductive electrode terminal of one of the two battery cells to the insulated electrode terminal.

In some embodiments, the first battery includes a first electrode terminal, the second electrode terminal, the first electrode terminal is electrically connected to a battery case of the first battery; and the second battery includes a third electrode terminal And a fourth electrode terminal electrically connected to the battery case of the second battery; the first electrode terminal is connected to the fourth electrode terminal.

In some embodiments, the battery case of the first battery and/or the battery case surface of the second battery are provided with conductive protrusions, and the conductive protrusions are disposed between the first battery and the second battery; The conductive protrusion can be in electrical contact with the battery case of another battery in the dual battery pack when the temperature or pressure inside the battery case of the first battery and/or the second battery causes the battery case to be deformed The third electrode terminal and the fourth electrode terminal of the second battery are electrically conducted.

Further, a surface of the battery case of the second battery is provided with a conductive protrusion, and the conductive protrusion is disposed between the first battery and the second battery, when the battery case of the second battery is inside Temperature or When the pressure deforms the battery case, the conductive protrusion contacts the battery case of the first battery such that the third electrode terminal and the fourth electrode terminal of the second battery are electrically turned on and short-circuited.

Further, the battery case surface of the first battery and the battery case surface of the second battery are provided with the conductive protrusions, and the two conductive protrusions are disposed between the first battery and the second battery The at least one portion of the two conductive protrusions are disposed opposite to each other.

Preferably, the conductive protrusion is disposed at a middle portion of a surface of the battery case.

In some embodiments, the dual battery pack includes a battery connecting piece that connects the first battery and the second battery, and the battery connecting piece is provided with a weak portion.

In some embodiments, the battery case interior of the second battery includes a battery core and a third lead-out piece for electrically connecting the battery core and the third electrode terminal, and a fourth for electrically connecting the battery core and the fourth electrode terminal. a lead piece; the fourth lead piece and/or the third lead piece are provided with a fuse portion.

In some embodiments, the third electrode terminal is electrically connected to the positive electrode of the second battery, the fourth electrode terminal is electrically connected to the negative electrode of the second battery, and the fuse portion is disposed on the third lead piece.

The present application provides a battery module including a dual battery pack, which is a dual battery pack according to any of the above embodiments.

In some embodiments, the battery module includes at least two pull plates, a plurality of pull rods, and at least one battery assembly board for assembling the battery module, the pull plates are disposed on two sides of the battery module. The pull rod is used to connect the pull plate, and the battery assembly board cooperates with the pull plate and the pull rod to combine the battery into the battery module.

Advantageous Effects: According to the unit battery provided by the present application, the unit cell is deformed by being provided with at least one conductive boss on the surface of the battery case, which is affected by temperature or pressure. When the internal pressure of the battery is abnormal, the internal air pressure of the battery increases, the battery case is deformed and expanded outward, and the conductive protrusion of the surface of the battery case contacts the battery case of the adjacent battery, thereby causing the conductive electrode terminal of the battery. Short-circuiting with the insulated electrode terminal causes the single cell to generate a large current to blow the battery to a weak position and disconnect the connection point. The battery uses the temperature and the air pressure as triggering conditions to make the battery casing surface of the single battery contact the adjacent battery, so that the positive and negative terminals of the battery generate a large current to quickly release the internal energy of the battery, and the connection of the disconnected battery is weak. The position prevents the battery from being out of control, can protect the battery in time and effectively, improve the safety performance of the single battery, avoid the safety of the entire battery module by a single abnormal battery, and improve the safety factor of the entire battery module.

DRAWINGS

1 is a schematic diagram of a unit battery provided by an embodiment of the present application;

2 is a schematic overall view of a unit battery provided by an embodiment of the present application;

3 is a schematic side view of a battery module according to an embodiment of the present application;

4 is a schematic side view showing an abnormality of a battery module according to an embodiment of the present application;

FIG. 5 is a schematic overall view of a battery module according to an embodiment of the present application; FIG.

6 is a schematic diagram of a second battery component assembly according to an embodiment of the present application;

FIG. 7 is a partial schematic view showing the connection of a battery module according to an embodiment of the present application; FIG.

FIG. 8 is a schematic diagram of connection of a battery module according to an embodiment of the present application; FIG.

FIG. 9 is a schematic diagram of a pool assembling board according to an embodiment of the present application;

10 is a schematic overall view of a battery module according to an embodiment of the present application;

FIG. 11 is a schematic diagram of connection of a dual battery pack according to an embodiment of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS:

Conduction electrode terminal 11; insulated electrode terminal 12; cover body 13; battery case body 14; conductive projection 15; insulating layer 151; low-resistance seal 16; insulating seal 17; first battery 21; 22; third electrode terminal 223; fourth electrode terminal 224; third lead piece 233; fourth lead piece 234; fuse portion 235; battery connecting piece 23; weak portion 231; pull plate 31; tie rod 32; battery assembly plate 33 Module mounting block 34.

detailed description

In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting.

The embodiments of the present application 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 intended to be illustrative, and are not to be construed as limiting.

In the description of the present application, it is to be understood that the terms "lateral", "length", "width", "upper", "lower", "front", "back", "left", "right", " The orientation or positional relationship of the indications such as "upright", "horizontal", "top", "bottom", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, only The present application and the simplifications of the present invention are not to be construed as limiting the scope of the present application.

Moreover, 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" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, 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 otherwise explicitly stated and defined. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood on a case-by-case basis.

In the present application, the first feature "on" or "below" the second feature may be the direct contact of the first and second features, or the first and second features are indirectly through the intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

The present application will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in FIG. 1 to FIG. 2, the present application provides a single cell comprising a sealed battery case, two polarity electrode terminals for extracting current inside the battery case, The electrode terminal includes a conduction electrode terminal 11 electrically connected to the battery case, and an insulated electrode terminal 12 insulated from the battery case. The surface of the battery case is provided with at least one conductive protrusion 15 which is electrically deformed when the battery case and/or the conductive protrusion 15 are deformed by temperature or pressure inside the battery case. 15 can be electrically connected to the battery case of an adjacent battery. The two electrode terminals of the unit cell are shorted to cause the unit cell to generate a large current to blow the battery connection weak position and disconnect the connection point.

The unit cell provided by the present application is formed by providing at least one conductive protrusion 15 on the surface of the battery case, and the conductive protrusion 15 is deformed by temperature or pressure. When the internality of the battery is abnormal, the internal air pressure of the battery increases, and the battery case is deformed and expanded outward, and the conductive convex surface of the battery case surface The starting portion 15 is in contact with the battery case of the adjacent battery, causing the conductive electrode terminal 11 of the battery to be short-circuited with the insulated electrode terminal 12 so that the single battery generates a large current to blow the battery connection weak position and disconnect the connection point.

The battery contacts the adjacent battery with the temperature and the air pressure as triggering conditions, so that the positive and negative terminals of the battery generate a large current to quickly release the internal energy of the battery, and disconnect the weak connection of the battery. To prevent the battery from running out of control, to protect the battery in a timely and effective manner, to improve the safety performance of the single battery, to avoid the safety of the entire battery module by a single abnormal battery, and to improve the safety factor of the entire battery module.

Further, the surface of the battery case is provided with an insulating layer 151 except for other portions where the conductive protrusions 15 are located. The battery case is provided with an insulating layer 151 at a position other than the conductive protrusion 15 , which means that the insulating material or the plating film is covered at other places than the conductive protrusion 15 , and the design is optimized as an avoidance. Causes unnecessary short circuit and interferes with the normal use of the battery.

The present application mainly utilizes the shorting of the conductive protrusions 15 of adjacent cells to cause a short circuit of the battery to generate a large current so that the connection point is broken to protect the battery. Two embodiments of the arrangement of the conductive protrusions 15 are described below.

The conductive protrusion 15 is integrally formed with the battery case. Specifically, the manufacturing process of the conductive protrusion 15 is as follows. In the industrial production process, a part of the battery case is set to an outwardly convex structure by punching in the process of manufacturing the battery case. Specifically, an external force can be applied to the battery case by using a press and a mold to plastically deform, thereby obtaining a desired shape and size, and finally the conductive boss portion 15 is obtained.

Further, the second molding manner of the conductive protrusion portion 15 is as follows. The conductive protrusion portion 15 is formed by a conductive member disposed on a surface of the battery case. Specifically, the conductive protrusion 15 is formed by soldering a conductive member on the surface of the battery case.

Other components that the unit battery also has will be described below.

The sealed battery case includes a battery case body 14 and a cover body 13.

The cover body 13 is electrically connected to the battery case body 14; the cover body 13 is provided with two through holes for mounting the conductive electrode terminal 11 and the insulated electrode terminal 12.

Specifically, as shown in FIG. 1 and FIG. 2, further, the conductive electrode terminal 11 and the cover body 13 are sealed by a low-resistance seal 16 , and the insulated electrode terminal 12 and the cover body are 13 is insulated and sealed by an insulating seal 17.

As shown in FIG. 1 , the sealing arrangement of the low-resistance sealing member 16 ensures that the cover body 13 and the conductive electrode terminal 11 are sealed, and the conductive protrusion 15 can be electrically connected to the single battery, which is beneficial to the conduction. Short circuit between the single battery and the adjacent battery when the single battery is abnormal.

The insulated electrode terminal 12 is a conventional arrangement of a single battery, which ensures normal use of the single battery.

The insulating seal 17 ensures a good seal inside the unit cell.

The present application also provides a dual battery pack including a first battery 21 and a second battery 22.

At least one of the first battery 21 and the second battery 22 is a single battery, and the single battery is the single battery according to any one of the above embodiments, as shown in FIG. 1 and FIG. When the internal temperature or pressure of the battery case of the single cell in the dual battery pack causes the battery case to be deformed, the conductive protrusion 15 can be in electrical contact with the battery case of another battery in the dual battery pack. The conduction electrode terminal 11 of one of the two battery packs is electrically connected to the insulated electrode terminal 12.

As shown in FIG. 11, the second battery 22 in the embodiment is set as the single battery.

Further, the first battery 21 includes a first electrode terminal and a second electrode terminal, and the first electrode terminal is electrically connected to the battery case of the first battery 21.

The second battery 22 includes a third electrode terminal 223 and a fourth electrode terminal 224 , and the third electrode terminal 223 is electrically connected to the battery case of the second battery 22 .

The first electrode terminal is connected to the fourth electrode terminal 224.

Preferably, the first electrode terminal is connected to the positive electrode of the first battery 21, and the third electrode terminal 223 is connected to the positive electrode of the second battery 22. Specifically, as shown in FIG. 5, the first battery 21 and the second battery 22 are connected by a battery connecting piece 23.

Further, the battery case of the first battery 21 and/or the battery case surface of the second battery 22 are provided with conductive protrusions 15 disposed on the first battery 21 and the second Between the batteries 22; specifically, as shown in FIG.

The conductive protrusion 15 can be combined with the battery case of another battery in the dual battery pack when the temperature or pressure inside the battery case of the first battery 21 and/or the second battery 22 causes the battery case to be deformed The electrical contact electrically conducts the third electrode terminal 223 and the second electrode terminal of the second battery 22.

Preferably, as shown in FIG. 11, the surface of the battery case of the second battery is provided with a conductive protrusion, and the conductive protrusion is disposed between the first battery 21 and the second battery 22, when the first When the temperature or pressure inside the battery case of the battery 22 causes the battery case to be deformed, the conductive protrusion contacts the battery case of the first battery 21 such that the third electrode terminal of the second battery 22 The fourth electrode terminal is electrically connected to be short-circuited.

As a preferred solution, the battery case surface of the first battery 21 and the battery case surface of the second battery 22 are provided with the conductive protrusions 15, and the two conductive protrusions 15 are disposed on the first battery. Between 21 and the second battery 22, at least a portion of the two conductive projections 15 are disposed opposite each other. As shown in FIG. 3 and FIG. 4, at least a portion of the two conductive protrusions 15 are disposed in a pair to ensure that the first battery 21 and the second battery 22 can contact each other in an abnormal situation, so that the second Short circuit of battery 22 produces a large current fuse connection weak position.

As a preferred solution, the conductive protrusion 15 is disposed at a middle portion of the surface of the battery case. Specifically, as shown in FIG. 2, when the internal state of the single cell is abnormal, gas is generated inside the battery, and at the same time, the internal pressure of the single cell increases due to the high temperature, and at this time, the central portion of the battery case surface of the single cell has the largest pressure, and the conductive bump The portion 15 is disposed at a middle portion of the surface of the battery case, which is favorable for the battery case to be deformed when the single battery is abnormal, and the short contact between the single battery and the opposite side of the battery case of the adjacent battery is short-circuited, and the abnormal battery is Protect.

As a further optimization scheme or as a specific embodiment of the present application, the dual battery pack includes a battery connecting piece 23 connecting the first battery 21 and the second battery 22, and the battery connecting piece 23 is provided. Weak portion 231. The design of the weak portion 231 facilitates a large current to blow the battery connecting piece 23. As shown in FIG. 3 and FIG. 4 and FIG. 5, when one or two of the two battery packs are abnormal, the surface of the battery case of the dual battery pack is deformed, and the conductive protrusion portion and the shell of the adjacent battery are The surface contact of the body, that is, the first battery 21 is in contact with two adjacent faces of the second battery 22, the short circuit of the two battery terminals of the second battery 22 is short-circuited to generate a large current, and the battery connection piece 23 is weak. The portion 231 is blown, and the inside of the dual battery pack is disconnected.

As another embodiment of the present application, the battery case interior of the second battery 22 includes a battery core and a third lead-out piece 233 for electrically connecting the battery core and the third electrode terminal 223 for electrically connecting the battery cells. The fourth lead piece 234 of the fourth electrode terminal 224; the fourth lead piece 234 and/or the third lead piece 233 are provided with a fuse portion 235. As a preferred solution, the third electrode terminal and the second battery The positive electrode is electrically connected, the fourth electrode terminal is electrically connected to the negative electrode of the second battery, and the fuse portion is disposed on the third lead piece. In some embodiments, the positive electrode strip of the battery is made of aluminum, and the inner lead of the negative electrode is made of copper or the like. Since the melting point of aluminum is relatively low and it is easy to be melted, the melting point of copper is high and it is not easily melted. Therefore, the fuse portion 235 is provided on the lead piece in the positive electrode, and as shown in FIGS. 6 and 5, the fuse portion 235 is usually provided on the positive electrode lead piece.

The present application further provides a battery module comprising the dual battery pack of any of the above embodiments. For example, as shown in FIG. 7 and FIG. 8, n batteries A1.....Am, Am+1, . . . An-1, An in the battery module are connected in series, and the battery Am and The battery Am+1 is the first battery 21 and the second battery 22, wherein 1≤m≤n-1, and the opposite electrode terminals of the adjacent two batteries of the n batteries are connected to each other to form the battery module. The other two adjacent batteries may also be the dual battery pack, and the battery module may be a combination of one of the dual battery packs or a plurality of the dual battery packs, and the specific design may be according to embodiments and actual needs. to make sure.

Further, the battery module includes at least two pull plates 31, a plurality of pull rods 32, and at least one battery assembly board 33 for assembling the battery modules.

The pull plate 31 is disposed on two sides of the battery module, the pull rod 32 is used to connect the pull plate 31, and the battery assembly board 33 is combined with the pull plate 31 and the pull rod 32 to combine the batteries into a The battery module. The pull plate 31 and the pull rod 32 are made of an insulating material. Specifically, as shown in FIG. 9 and FIG. 10, the battery module is provided with pull tabs 31 on both sides thereof, and the pull rods 32 are respectively disposed near the sides of the two edges of the battery module and the battery modules. On the upper surface, the pull plate 31 and the pull rod 32 are fixed by rivets. The pull plate 31 and the pull rod 32 strengthen the connection between the individual cells in the battery module, so that the structure between the batteries is more compact, and the internal looseness of the battery case surface is prevented from being fully contacted, and the conductive convex portion cannot be fully contacted or even not contact.

And the battery assembly board 33 is combined with the pull plate 31 and the pull rod 32 to form a plurality of the batteries to form a battery module. As shown in FIG. 10, after the battery module is successfully assembled, the battery module is further provided with a module mounting block 34 at both ends thereof, and the module mounting block 34 is used for the battery module and other batteries. The module is connected or the battery module is mounted on the car.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the application. In this statement In the specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection of the present application. Within the scope.

Claims

A unit cell characterized in that the unit cell includes a sealed battery case, two polarity electrode terminals for extracting current inside the battery case, and the electrode terminal includes the battery case An electrically conductive conduction electrode terminal, an insulated electrode terminal insulated from the battery case, the battery case surface being provided with at least one conductive protrusion portion, wherein the battery case is caused by temperature or pressure inside the battery case The conductive protrusions can be electrically connected to the battery case of the adjacent battery when the conductive protrusions are deformed.
The unit cell according to claim 1, wherein the surface of the battery case is provided with an insulating layer in addition to the region where the conductive projections are located.
The unit cell according to claim 2, wherein the conductive bump is integrally formed with the battery case.
The unit cell according to claim 2, wherein the conductive bump is formed by a conductive member provided on a surface of the battery case.
The unit cell according to claim 1, wherein the sealed battery case comprises a battery case body and a cover body;

The cover body is electrically connected to the battery case body; and the cover body is provided with a through hole for mounting the conductive electrode terminal and the insulated electrode terminal.
The unit cell according to claim 5, wherein the conduction electrode terminal and the cover body are sealed by a low-resistance conductive seal, and the insulated electrode terminal and the cover body are insulated and sealed Insulated seal.
A dual battery pack, characterized in that the dual battery pack comprises a first battery and a second battery;

At least one of the first battery and the second battery is a single battery, and the single battery is the single battery according to any one of claims 1 to 6, when the single battery in the dual battery When the battery case internal temperature or pressure causes the battery case to be deformed, the conductive protrusion can be electrically contacted with the battery case of another battery in the dual battery unit to make a single battery in the dual battery unit The conductive electrode terminal is electrically connected to the insulated electrode terminal.
The dual battery pack according to claim 7, wherein the first battery comprises a first electrode terminal and a second electrode terminal;

The first electrode terminal is electrically connected to the battery case of the first battery;

The second battery includes a third electrode terminal and a fourth electrode terminal;

The third electrode terminal is electrically connected to the battery case of the second battery;

The first electrode terminal is connected to the fourth electrode terminal.
The dual battery pack according to claim 8, wherein the battery case of the first battery and/or the battery case surface of the second battery are provided with conductive protrusions, and the conductive protrusions are disposed on Between the first battery and the second battery; when the temperature or pressure inside the battery case of the first battery and/or the second battery deforms the battery case, the conductive protrusion can be combined with the double battery The battery case of the other battery is electrically contacted to electrically conduct the third electrode terminal and the fourth electrode terminal of the second battery.
The dual battery unit according to claim 9, wherein a surface of the battery case of the second battery is provided with a conductive protrusion, and the conductive protrusion is disposed between the first battery and the second battery. When the temperature or pressure inside the battery case of the second battery deforms the battery case, the conductive protrusion contacts the battery case of the first battery, so that the third battery is the third The electrode terminal and the fourth electrode terminal are electrically connected and short-circuited.
The dual battery pack according to claim 9, wherein the battery case surface of the first battery and the battery case surface of the second battery are provided with the conductive protrusions, and the two conductive protrusions And disposed between the first battery and the second battery, at least a portion of the two conductive protrusions are disposed opposite to each other.
The dual battery pack according to claim 9 or 11, wherein the conductive projection is provided at a central portion of a surface of the battery case.
The dual battery pack according to claim 9 or 11 or 12, wherein the dual battery pack includes a battery connecting piece that connects the first battery and the second battery, and the battery connecting piece is provided with a weak portion.
The dual battery pack according to claim 9 or 11 or 12, wherein the battery case interior of the second battery includes a battery core and a third lead-out piece for electrically connecting the battery cell and the third electrode terminal, And a fourth lead piece for electrically connecting the battery core and the fourth electrode terminal; the fourth lead piece and/or the third lead piece are provided with a fuse portion.
The dual battery pack according to claim 14, wherein the third electrode terminal is electrically connected to a positive electrode of the second battery, and the fourth electrode terminal is electrically connected to a negative electrode of the second battery, the fuse The portion is disposed on the third lead piece.
A battery module, characterized in that the battery module comprises any of claims 7-15 A double battery pack as described.
The battery module according to claim 16, wherein the battery module comprises at least two pull plates, a plurality of pull rods, and at least one battery assembly board for assembling the battery module, the pull plate setting On the two sides of the battery module, the pull rod is used to connect the pull plate, and the battery assembly board cooperates with the pull plate and the pull rod to combine the battery into the battery module.