AU2021310148A1

AU2021310148A1 - Explosion-proof battery pack

Info

Publication number: AU2021310148A1
Application number: AU2021310148A
Authority: AU
Inventors: Kai Chin LIM; Khay Wai SEE; Yunpeng Wang; Neng ZHANG
Original assignee: Azure Mining Tech Pty Ltd; Chinese Inst Of Coal Science
Current assignee: Azure Mining Technology Pty Ltd; Chinese Institute Of Coal Science
Priority date: 2020-07-14
Filing date: 2021-07-06
Publication date: 2023-03-16
Anticipated expiration: 2041-07-06
Also published as: AU2021310148B2; WO2022012377A1

Abstract

Provided is an explosion-proof battery. The explosion-proof battery comprises: a first box body and a second box body; a battery module which is arranged in the first box body, the battery module comprising a first area and a second area, wherein the first area comprises all electrodes in the battery module, and the second area comprises all pressure relief valves in the battery module; and a power source control module which is arranged in the second box body.

Description

EXPLOSION-PROOF BATTERY PACK CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to the following applications:

1) Chinese Patent Application No. 202010676685.7, entitled "EXPLOSION-PROOF

BATTERY", filed with the China National Intellectual Property Administration on July 14, 2020,

submitted by Azure Mining Technology Pty., Ltd.,

2) Chinese Patent Application No. 202010673756.8, entitled "EXPLOSION-PROOF

submitted by Azure Mining Technology Pty., Ltd.,

3) Chinese Patent Application No. 202010674922.6, entitled "EXPLOSION-PROOF

submitted by Azure Mining Technology Pty., Ltd.

FIELD

The present disclosure relates to the field of battery technology, and especially to an

explosion-proof battery pack.

BACKGROUND

With the increasing demand for battery pack with larger capacity and smaller size for various

types of electronic and electrical equipment used in the explosive mixture environment, the current

industrial production tends to apply lithium-ion batteries with higher energy density. However, the

higher the energy density of a battery, the more factors affecting its operation safety. Therefore,

explosion-proof protection requirements for the lithium-ion battery pack used in the explosive

environment are extremely stringent.

SUMMARY

The present disclosure provides an explosion-proof battery pack including a first container

and a second container; a battery module arranged in the first container, in which the battery

module includes a first area and a second area, the first area includes all electrodes in the battery

module, and the second area includes all pressure relief valves in the battery module; and a power source control module arranged in the second container.

In some embodiments, the first container and/or the second container is an explosion-proof

container, the explosion-proof container includes a container body; and an explosion-proof lid

arranged on the container body, in which the lid is connected with the container body by bolts.

In some embodiments, the explosion-proof battery pack may further include a first pressure

release device arranged between the first container and the second container, and configured to

release the pressure in the first container to the second container; and a second pressure release

device arranged in the second container, and configured to release the pressure in the second

container to the outside.

In some embodiments, the explosion-proof battery pack may further include a third pressure

release device arranged on the container lid or the container body of the first container, and

configured to directly release the pressure in the first container to the outside when the pressure in

the first container increases.

In some embodiments, the explosion-proof battery pack may further include a first

encapsulation layer covering the first area of the battery module, in which the first encapsulation

layer has a first opening, and the first opening corresponds to the pressure relief valve so that the

pressure relief valve is subjected to venting through the first opening; and a second encapsulation

layer covering at least the second area of the battery module, in which the impact strength of the

second encapsulation layer is smaller than that of the pressure relief valve when the pressure relief

valve is opened, so that the second encapsulation layer can be broken when the pressure relief

valve is opened.

In some embodiments, the second encapsulation layer further covers the first area, and the

impact strength of the second encapsulation layer is smaller than that of the first encapsulation

layer.

pressure relief valve is subjected to venting through the first opening; a protective cover covering

the second area of the battery module, in which a gap exists between the protective cover and the

pressure relief valve; and a second encapsulation layer covering the protective cover in the second

area of the battery module, in which the impact strength of the second encapsulation layer is smaller than that of the pressure relief valve when the pressure relief valve is opened, so that the second encapsulation layer can be broken when the pressure relief valve is opened. In some embodiments, the explosion-proof battery pack may further include a third encapsulation layer covering the second encapsulation layer, in which the third encapsulation layer has a second opening at a location of the pressure relief valve, and the second opening corresponds to the pressure relief valve so that the pressure relief valve is subjected to venting through the second opening, and the impact strength of the third encapsulation layer is greater than that of the first encapsulation layer. In some embodiments, the first encapsulation layer, the second encapsulation layer and the third encapsulation layer fully fill the space between the battery module and side walls and the bottom of the first container to fit it with the container body of the first container tightly and to stabilize the battery module. In some embodiments, the first encapsulation layer, the second encapsulation layer and the third encapsulation layer are silica gel or epoxy resin. In some embodiments, a free space exists between the encapsulation layer covering the battery module and the container lid of the first container. In some embodiments, the explosion-proof battery pack may further include a first pressure sensor arranged in the first container; and a second pressure sensor arranged in the second container, in which a pressure threshold of the second pressure sensor is less than that of the first pressure sensor. In some embodiments, the explosion-proof battery pack may further include the battery module and the power source control module being electrically connected via a first lead device between the first container and the second container; and a second lead device arranged on the second container so that the power source control module is electrically connected with external circuits. In some embodiments, the explosion-proof battery pack may further include a first support arranged in the first container, and configured to support and stabilize the battery module; and a second support arranged in the second container, and configured to support and stabilize the power source control module. Additional aspects and advantages of the present disclosure will be set forth in part in the following description, part of which will become obvious from the following description or will be learned through the practice of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and/or additional aspects and advantages of the present disclosure will become

obvious and easily understood from the following description of embodiments taken in

conjunction with the attached drawings.

FIG. 1 is a schematic diagram showing an explosion-proof battery pack of an embodiment of

the present disclosure.

FIG. 2 is a schematic diagram showing a battery module provided in another embodiment of

the present disclosure.

FIG. 3 is a schematic diagram showing a power source control module provided in another

embodiment of the present disclosure.

FIG. 4 is a schematic diagram showing a battery management system and a protection unit

provided in another embodiment of the present disclosure.

FIG. 5 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 6 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 7 a schematic diagram showing an explosion-proof battery pack of another embodiment

of the present disclosure.

FIG. 8 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 9 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 10 a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 11 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 12 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 13 is a schematic diagram showing an explosion-proof battery pack of another embodiment of the present disclosure.

FIG. 14 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 15 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 16 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 17 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 18 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

FIG. 19 is a schematic diagram showing an explosion-proof battery pack of another

embodiment of the present disclosure.

Reference numbers:

explosion-proof battery pack 10, container body 101, container lid 102;

first container 110, second container 120, battery module 13, power source control module

14, electrodes 131, pressure relief valve 132, first pressure release device 50, second pressure

release device 60, first encapsulation layer 133, second encapsulation layer 134, third

encapsulation layer 135, free space 18, first support 20, second support 21, protective cover 70,

first pressure sensor 71, second pressure sensor 72, first lead device 15, second lead device 22,

first explosion-proof container 11, second explosion-proof container 12, third pressure release

device 17, container body 101, bolts 103, pressure sensor 16, container 111, explosion-proof

container 112, container lid 106, explosion-proof container lid 105.

DETAILED DESCRIPTION

Embodiments of the present disclosure are described in detail below, and examples of the

embodiments are shown in the attached drawings. The same or similar elements or the elements

having same or similar functions are denoted by same or similar reference numerals throughout

the descriptions. The embodiments described below with reference to the attached drawings are

illustrative, and are intended to explain the present disclosure, and shall not be construed to limit

the present disclosure.

An explosion-proof battery pack of an embodiment of the present disclosure is described below with reference to the attached drawings. FIG. 1 is a schematic diagram showing an explosion-proof battery pack of an embodiment of the present disclosure. Referring to FIG. 1, the explosion-proof battery pack 10 includes a first container 110 and a second container 120; a battery module 13 arranged in the first container 110, in which the battery module 13 includes a first area and a second area, the first area includes all electrodes 131 in the battery module 13, and the second area includes all pressure relief valves 132 in the battery module 13; and a power source control module 14 arranged in the second container 120. In an embodiment of the present disclosure, the first container 110 and/or the second container 120 can be an explosion-proof container. For example, the first container 110 can be a first explosion-proof container 11, and the second container 120 can be a second explosion-proof container 12. Alternatively, the first container 110 is a container 111, that is, a normal container, and the second container 120 can be an explosion-proof container 112. Alternatively, the first container 110 can be the explosion-proof container, the second container body can be the normal container, etc. In the embodiment of the present disclosure, the explosion-proof battery pack 10 is taken as an example of a lithium-ion battery, or it can be any other possible type of batteries that are allowed to be used for underground coal mine operation, which is not limited. The above-mentioned battery module 13 includes a battery unit, a battery management system and a protection unit matched with the battery unit, in which the battery unit can be composed of single lithium-ion battery cells connected in series or in parallel. Referring to FIG. 2, FIG. 2 is a schematic diagram showing a battery module provided in another embodiment of the present disclosure. The battery module includes a battery unit 201 composing of single lithium-ion battery cells connected in series or parallel and a battery management system and a protection unit 202 matching the battery unit. Referring to FIG. 3, FIG. 3 is a schematic diagram showing a power source control module provided in another embodiment of the present disclosure. The power source control module may include, for example, an electrical circuit switching unit 301 and a communication circuit switching unit 302. The electrical circuit switching unit 301 and the communication circuit switching unit 302 in the above-mentioned power source control module are composed of a certain number of relays, a certain number of fuses and manual mechanical switches.

Referring to FIG. 4, FIG. 4 is a schematic diagram showing a battery management system

and a protection unit provided in another embodiment of the present disclosure. The battery

management system and the protection unit 202 include a management unit 20201 composing of

a battery management system and a protection unit 20202 composing of a relay and a fuse, in

which the management unit 20201 monitors information such as a voltage, a current, a temperature,

and deformation of all single battery cells in the battery unit 201 in real time, and controls an

operating state of a protection unit 20202.

In an embodiment of the present disclosure, by configuring the battery module in the first

container, the battery module includes a first area and a second area. The first area includes all

electrodes in the battery module, and the second area includes all pressure relief valves in the

battery module. The power source control module is configured in the second container to realize

an isolated configuration of the power source control module and the battery module, which can

effectively reduce the influence on each other when the power control module occurs a

deflagration accident and when the battery module fails.

embodiment of the present disclosure. As shown in FIG. 5, in an embodiment of the present

disclosure, the explosion-proof battery pack 10 may include a first container 110, a second

container 120, a battery module 13, a power source control module 14, a first pressure release

device 50, and a second pressure release device 60.

The battery module 13 is arranged in the first container 110, and the battery module 13

includes a first area and a second area. The first area includes all electrodes 131 in the battery

module 13, and the second area includes all pressure relief valves132 in the battery module 13.

It is to be understood that the battery module 13 can be composed of single lithium-ion battery

cells connected in series or parallel. Each single lithium-ion battery cell has both positive and

negative electrodes 131. When there are N single lithium-ion battery cells in the battery module

13, there are N*2 electrodes 131, and N is an integer greater than 1. At this time, the first area

includes all the electrodes 131 and all parts exclude pressure relief valves of the battery cells in

the battery module 13. Similarly, the second area includes all the pressure relief valves132 of the

battery cells in the battery module 13.

It is to be noted that a battery explosion generally refers to a thermal runaway of the lithium- ion battery, which causes an internal pressure of the battery increases sharply until the explosion occurs by breaking through the housing covering the battery. Therefore, a high-capacity lithium ion battery is usually equipped with a pressure relief valve, so that when a gas pressure inside the battery reaches the preset threshold of the pressure relief valve, the gas in the battery can be released to the outside of the battery by breaking the pressure relief valve, thus effectively avoiding the explosion of the battery. The power source control module 14 is arranged in the second container 120. It is to be noted that the power source control module 14 is electrically connected with the battery module 13, and the battery control module 14 is configured to control and monitor charging and discharging states of the battery module 13. Specifically, as shown in FIG. 6, the battery module 13 and the power source control module 14 are electrically connected via a first lead device 15 between the first container 110 and the second container 120. For example, an electrical control wire between the power source control module 14 and the battery module 13 passes through cable glands between the first container 110 and the second container 120 via the first lead device 15. It is to be understood that the second container 120 may also be arranged with a second lead device 22 for electrical connection between the power source control module 14 and external circuits. The external circuits may be a control circuit of an electrical equipment, so that the power source control module 14 can control the charging and discharging of the battery module 13 according to the load demand. The first lead device 15 and the second lead device 22 may be composed of one or more cable glands. A first pressure release device 50 is arranged between the first container 110 and the second container 120, and is configured to release the pressure in the first container 110 to the second container 120. A second pressure release device 60 is arranged in the second container 120, and is configured to release the pressure in the second container 120 to the outside. Further, since the battery module 13 releases the gas generated in the battery module 13 to the outside of the battery module 13 via the pressure relief valve 132, however, since the first container 110 has a certain tightness, as the gas in the battery module 13 continues to increase, a gas pressure in the first container 110 will gradually increase, which has a risk of explosion.

Therefore, an embodiment of the present disclosure also arranges a first pressure release device 50 between the first container 110 and the second container 120, so that a pressure in the first container 110 can be released into the second container 120, thus effectively reducing the risk of explosion of the first container 110. Meanwhile, a buffer space formed by the second container 120 effectively reduces a pressure of the gas to be discharged, thus reducing the risk of explosion of the explosion-proof battery pack as a whole. Further, in the present disclosure also arranges a second pressure release device 60 in the second container 120, so that the gas generated by the battery module 13 can be finally discharged to the outside of the explosion-proof battery pack 10 via the second pressure release device 60, that is, the gas generated by the battery module 13 is finally discharged to the outside of the explosion-proof battery pack via the pressure relief valve 132, the first pressure release device 50 and the second pressure release device 60 in sequence, thus effectively avoiding the explosion of the battery. Therefore, in the present disclosure, it forms a two-stage discharge by arranging pressure release devices between the first container and the second container, and on the second container, respectively, so that the pressure caused by the failure of the battery module 13 can be effectively reduced through step-by-step discharge, without causing explosive extreme harm to an external environment. In the embodiment of the present disclosure, the first pressure release device 50 and the second pressure release device 60 may be a valve group composed of one or more rupture discs, one-way valves and/or flame arresters. Further, as shown in FIG. 7, an explosion-proof battery pack 10 may further include a first encapsulation layer 133 and a second encapsulation layer 134. The first encapsulation layer 133 is configured to cover the first area of the battery module 13, and the first encapsulation layer 133 has a first opening, and the first opening corresponds to the pressure relief valve 132, so that the gas and pressure that may rise inside the battery cell could be released through the pressure relief valve 132 and the first opening. It is to be noted that a potential ignition source in the battery is the live part, that is, the electrodes 131 in the battery module 13. In the present disclosure, the first area of the battery module 13 is covered by the first encapsulation layer 133, that is, all electrodes 131 in the battery module 13 are isolated from a gas outside the battery module 13 by the first encapsulation layer

133, thus effectively preventing the electrodes 131 in the battery module 13 from generating

electric sparks and igniting explosive gases in the surrounding environment, thus causing

explosive hazard accidents.

The second encapsulation layer 134 covers at least a second area of the battery module 13, in

which the impact strength of the second encapsulation layer 134 is smaller than that of the pressure

relief valve when the pressure relief valve is opened, so that the second encapsulation layer can be

broken when the pressure relief valve 132 is released.

That is to say, the present disclosure also protects all pressure relief valves of the battery cells

132 in the battery module 13 by the second encapsulation layer 134, so as to prevent the pressure

relief valves132 of the battery cells from being broken by a force from the outside of the battery

module 13, thus affecting a pressure environment inside the battery module 13, causing the battery

to burst, and effectively improving the reliability of the battery module.

At the same time, the second encapsulation layer 134 and the pressure relief valve 132 can

be broken by a gas generated inside the battery module 13, that is, the second encapsulation layer

134 and the pressure relief valve 132 can be broken when a pressure in the battery module 13

increases sharply, so as to release the gas in the battery module 13 to the outside of the battery

module 13, thus avoiding the gas in the battery module 13 from continuously increasing and

causing an explosion.

Alternatively, in order to further isolate the electrodes 131 in the battery module 13, the

second encapsulation layer 134 can cover the first area.

The impact strength of the second encapsulation layer 134 is smaller than that of the first

encapsulation layer 133, so that the second encapsulation layer 1134 can be more easily broken by

the gas in the battery module 13, so as to realize the purpose of gas release.

On the basis of the embodiment shown in FIG. 5, as shown in FIG. 8 to FIG. 10 (the second

container is not shown), the explosion-proof battery pack 10 further includes the first encapsulation

layer 133, the protective cover 70, and the second encapsulation layer 134.

The first encapsulation layer 133 has a first opening, and the first opening corresponds to the

pressure relief valve 132 so that the gas and pressure that may rise inside the battery cell could be

released through the pressure relief valve and the first opening.

The protective cover 70 covers the second area, and a gap exists between the protective cover

70 and the pressure relief valve 132.

The second encapsulation layer 134 covers the protective cover 70 in the second area of the

battery module, in which the impact strength of the second encapsulation layer 134 is smaller than

that of the pressure relief valve 132 when the pressure relief valve 132 is opened, so that the second

encapsulation layer can be broken when the pressure relief valve 132 is opened.

FIG. 8 to FIG. 10 show three cases where the second encapsulation layer 134 covers the

protective cover 70.

In an embodiment, it can be more conducive for the battery to open the pressure relief valve

when accidents such as thermal runaway occur by arranging the protective cover and reserving a

certain gap between the protective cover and the battery pressure relief valve, thus improving the

use safety of the battery.

In some embodiments, as shown in FIG. 7, the explosion-proof battery pack 10 may further

include a third encapsulation layer 135, in which the third encapsulation layer 135 covers the

second encapsulation layer 134.

The third encapsulation layer 135 has a second opening at the pressure relief valve 132, and

the second opening corresponds to the pressure relief valve 132 so that the pressure relief valve

132 is subjected to venting through the second opening, and the impact strength of the third

encapsulation layer 135 is greater than that of the first encapsulation layer 133. The first

encapsulation layer 133, the second encapsulation layer 134 and the third encapsulation layer 135

are silica gel or epoxy resin.

That is to say, in the present disclosure, a damage of the second encapsulation layer 134 can

be effectively limited when the pressure relief valve 132 is opened by arranging the third

encapsulation layer 135 on the outside of the second encapsulation layer 134. That is, the damage

part can be limited at the pressure relief valve to a maximum extent, thus effectively reducing the

damage impact on the first encapsulation layer 133 and improving the reliability of the

encapsulation protection. Moreover, the use of silica gel or epoxy resin can simplify a

manufacturing process of the encapsulation layer, and can ensure a better encapsulation protection

effect, which has better practicality and applicability.

Further, the first encapsulation layer 133, the second encapsulation layer 134 and the third

encapsulation layer 135 fully fill the space between the battery module 13 and side walls and the

bottom of the first container 110 to fit it with the container body of the first container 110 tightly

and to stabilize the battery module 13, thus preventing the battery module from colliding when the explosion-proof battery pack 10 is moved and resulting in unnecessary reaction inside the battery module 13.

On the basis of the embodiment shown in FIG. 5, the explosion-proof battery pack 10 may

further include the protective cover 70 and the first encapsulation layer 133, as shown in FIG. 11.

The protective cover 70 covers the second area of the battery module 13, and the gap exists

between the protective cover 70 and the pressure relief valve 132.

The first encapsulation layer 133 covers the first area of the battery module 13 and the

protective cover 70 in the second area of the battery module 13.

In the embodiment of the present disclosure, it can be more conducive for the battery to open

the pressure relief valve when accidents such as thermal runaway occur by arranging the protective

cover and reserving the certain gap between the protective cover and the battery pressure relief

valve, thus improving the use safety of the battery.

Further, as shown in FIG. 12, the explosion-proof battery pack 10 further includes a first

pressure sensor 71 and a second pressure sensor 72.

The first pressure sensor 71 is arranged in the first container 110, and the second pressure

sensor 72 is arranged in the second container 120, and a pressure threshold of the second pressure

sensor 72 is less than that of the first pressure sensor 71.

Specifically, since the pressure threshold of the second pressure sensor 72 is less than that of

the first pressure sensor 71, the gas enters into the second container 120 through the first pressure

release device 50, and a pressure can still reach the pressure threshold that triggers the second

pressure sensor 72 after being buffered and depressurized by the second container 120, which

improves the accuracy of pressure detection and ensures that the power source control module can

cut off a connection between the explosion-proof battery pack and the external circuit in a timely

when the pressure in the container rises. At the same time, an internal pressure of the container is

released timely, so as to reduce the explosion hidden danger of the explosion-proof battery pack

to the maximum extent.

In some embodiments, as shown in FIG. 13, the first container 110 and/or the second

container 120 can be an explosion-proof container. The explosion-proof container includes a

container body 101 and an explosion-proof lid 102. The explosion-proof container lid 102 can be

understood as a container lid with an explosion-proof function.

The explosion-proof lid 102 is arranged on the container body 101, and the explosion-proof lid 102 is connected with the container body 101 by bolts, so that the battery module 13 can be replaced and maintained in time, and the production cost can be saved. Further, as shown in FIG. 14, a free space 18 exists between the encapsulation layer covering the battery module 13 and the explosion-proof lid 102 to provide a buffer area for the gas generated after the release valve 132 is opened, so as to avoid an explosion accident of the explosion-proof container. It is to be noted that if the first container 110 is a normal container, the free space also exists between the encapsulation layer covering the battery module 13 and the lid of the first container 110. Further, as shown in FIG. 15, the explosion-proof battery pack 10 can further include a first support 20 arranged in the first container 110, and configured to support and stabilize the battery module 13, and a second support 21 arranged in the second container 120, and configured to support and stabilize the power source control module 14. To sum up, for the explosion-proof battery pack of an embodiment of the present disclosure, the first encapsulation layer and the second encapsulation layer can cover the electrodes of the battery module, thus effectively realizing the isolation of the electrodes, and avoiding spontaneous combustion of the electric spark between the battery module electrode and the ambient gas. At the same time, the present disclosure forms a secondary discharge by arranging the pressure release device between the first container and the second container as well as on the second container respectively, thus effectively reducing the pressure of the gas discharged from the battery module 13 destroys a shell of an upper level through step-by-step discharge, and it will not cause explosive extreme hazards to the external environment. Taking the first container and the second container are both explosion-proof containers as an example, the following description will be made with reference to combined with FIG. 16, FIG. 2 to FIG. 4 and FIG. 17 as an example. FIG. 16 is a schematic diagram showing an explosion-proof battery pack of another embodiment of the present disclosure. Referring to FIG. 16, the explosion-proof battery pack 10 may include a first explosion-proof container 11 and a second explosion-proof container 12; a battery module 13 arranged in the first explosion-proof container 11, in which the battery module 13 includes a first area and a second area, the first area includes all electrodes 131 in the battery module 13, and the second area includes all pressure relief valves 132 of the battery cells in the battery module 13; and a power source control module 14 arranged in the second explosion-proof container 12.

In an embodiment of the present disclosure, the explosion-proof battery pack 10 is taken as

an example of a lithium-ion battery, or it can be any other possible battery for underground coal

mine operation, which is not limited.

The above-mentioned battery module 13 includes a battery pack, and a battery management

system and a protection unit matched with the battery pack, in which the battery pack can be

composed of single lithium-ion battery cells connected in series or in parallel.

Referring to FIG. 2, the battery module 13 can include the battery pack 201 composing of

single lithium-ion battery cells connected in series or parallel and the battery management system

and the protection unit 202 matching the battery pack. Referring to FIG. 3, the power source

control module may include, for example, the electrical circuit switching unit 301 and the

communication circuit switching unit 302.

The electrical circuit switching unit 301 and the communication circuit switching unit 302 in

the above-mentioned power source control module are composed of a certain number of relays, a

certain number of fuses and manual mechanical switches.

Referring to FIG. 4, the battery management system and protection unit 202 includes the

management unit 20201 composing of the battery management system and the protection unit

20202 composing of the relay and the fuse, in which the management unit 20201 monitors

information such as the voltage, the current, the temperature and the deformation of single battery

cells in the battery pack 201 in real time, and controls the operating state of the protection unit

20202.

In some embodiments of the present disclosure, referring to FIG. 17, which is a schematic

diagram showing an explosion-proof battery pack of another embodiment of the present disclosure.

As shown in FIG. 17, the explosion-proof battery pack 10 may further include the first support 20

arranged in the first explosion-proof container 11, and configured to support and stabilize the

battery module 13; the second support 21 arranged in the second explosion-proof container 12,

and configured to support and stabilize the power source control module 14. That is, the battery

module 13 can be fixedly installed in the first explosion-proof container 11 via the first support 20,

and the power source control module 14 can be fixedly installed in the second explosion-proof

container 12 via the second support 21, thus effectively ensuring the stable installation

performance of the battery module 13 and the power source control module 14.

In an embodiment of the present disclosure, referring to FIG. 17, the explosion-proof battery

pack 10 may further include the first encapsulation layer 133 covering the first area of the battery

module 13, in which the first encapsulation layer 133 has a first opening, and the first opening

corresponds to the pressure relief valve 132 so that the pressure relief valve 132 can be subjected

to venting through the first opening; and the second encapsulation layer 134 covering at least the

second area of the battery module 13, in which the impact strength of the second encapsulation

layer 134 is smaller than that of the pressure relief valve when the pressure relief valve is opened,

so that the second encapsulation layer 134 can be broken when the pressure relief valve 132 is

opened.

In the embodiment of the present disclosure, the first encapsulation layer covering the first

area of the battery module and the second encapsulation layer covering at least the second area of

the battery module are configured for the explosion-proof battery pack. The encapsulation

protection of the battery module is realized by using the first encapsulation layer covering the first

the battery module.

Therefore, in the embodiment of the present disclosure, the explosion-proof protection

combining the encapsulation protection and explosion-proof protection of the battery module is

realized, and a two-level explosion-proof mechanism of the power source control module and the

battery module is realized, and the all switching control units are controlled to be disconnected by

the power source control module, which can ensure that other exposed conductors are not charged

except for the encapsulated battery module when an explosive environment occurs, thus realizing

that the contact between an ignition source and an explosive gas is blocked from the source, and

effectively improving the safety and reliability of explosion-proof batteries and a level of

explosion-proofprotection.

Generally, a main potential ignition source of a lithium-ion battery is a charged part (for

example, electrodes 131 of the battery module 13 in the present disclosure), that is, positive and

negative terminals of a single lithium-ion battery cells in the battery module 13. Therefore, in the

embodiment of the present disclosure, by covering and arranging the first encapsulation layer 133

in the first area of the battery module 13, the effective protection of the part corresponding to the

electrodes 131 of the single battery cells is realized by the first encapsulation layer 133, and

arranging the second encapsulation layer 134 covering at least the second area of the battery module 13, the second encapsulation layer 134 not only protects the first layer of encapsulating material, but also protects the pressure relief valve 132, thus realizing effective encapsulation protection. For example, the battery module 13 and the first support 20 are encapsulated with the encapsulation compound after the battery module 13 is installed in the first explosion-proof container 11. The bottom and side of the encapsulation compound are tightly bonded to the container of the first explosion-proof container 11, and a certain free space exists between the upper surface of the encapsulation compound and the explosion-proof lid 102. In the embodiment of the present disclosure, the impact strength of the second encapsulation layer 134 is configured to be smaller than that of the pressure relief valve when the pressure relief valve is opened, so that the second encapsulation layer 134 can be broken when the pressure relief valve 132 is opened, thus making it possible for the gas generated by an internal chemical reaction of the battery in extreme cases to be discharged directly to an external environment via a third pressure release device 17 arranged on the lid after being discharged to the container via the pressure relief valve 132, thus avoiding the accumulation of gases in the first explosion-proof container 11. In an embodiment of the present disclosure, the first encapsulation layer 133 can effectively protect the positive and negative terminals of the single lithium-ion battery cells, realize the effective isolation of potential ignition sources and explosive gases, significantly reduce the occurrence probability of extreme accidents such as combustion and explosion, and improve the safety protection performance of the explosion-proof battery pack 10. In an embodiment of the present disclosure, based on the embodiment of FIG. 16, as shown in FIG. 8 to FIG. 10, the explosion-proof battery pack 10 may further include the first encapsulation layer 133, the protective cover 70, and the second encapsulation layer 134. A coverage mode is as described in the above embodiment, which will not be elaborated herein. In an embodiment of the present disclosure, based on the embodiment of FIG. 16, as shown in FIG. 11, the explosion-proof battery pack 10 may further include the protective cover 70 and the first encapsulation layer 133. A coverage mode is as described in the above embodiment, which will not be elaborated herein. In an embodiment of the present disclosure, referring to FIG. 17, the first explosion-proof container 11 and the second explosion-proof container 12 may include the container body 101; the explosion-proof lid 102 arranged on the container body 101, in which the explosion-proof lid 102 is connected with the container body 101 by bolts 103 and a free space exists between the upper surface of the encapsulation layer covering the battery module 13 and the explosion-proof lid 102, and a sealing treatment is carried out between the explosion-proof lid 102 and the container body

101 by using a sealing joint strip, so that the sealing performance of the whole explosion-proof

battery pack 10 is improved. and it is also possible to assist in configuring some other components,

such as a pressure detector, to assist in enriching explosion-proof functions of the explosion-proof

battery pack 10 by providing the free space.

The first explosion-proof container 11 can be considered as an encapsulation cavity, and the

second explosion-proof container 12 can be considered as a wiring cavity. Referring to FIG. 17,

the battery module 13 and the power source control module 14 being electrically connected via a

first lead device 15 between the first container 11 and the second container 12, the power source

control module 14 controls all switching control units to be disconnected when the concentration

of explosive hazardous mixture in the environment exceeds the standard.

A second lead device 22 is also arranged on the above-mentioned explosion-proof container

12, and is configured to connect the explosion-proof battery pack 10 with an external circuit.

In some embodiments of the present disclosure, the above-mentioned first lead device 15 or

the second lead device 22 are composed of a certain number of cable glands.

In some embodiments, referring to the above-mentioned FIG. 3 and FIG. 17 together, the

battery module 13 is electrically connected with the electrical circuit switching unit 301 and the

communication circuit switching unit 302 in the power source control module 14 via the first lead

device 15, respectively. The electrical circuit switching unit 301 and the communication circuit

switching unit 302 in the power source control module 14 are electrically connected with the

external electrical circuit and the communication circuit of the first explosion-proof container 11

and the second explosion-proof container 12 via the second lead device 22, respectively.

A main function of the above-mentioned first lead device 15 or second lead device 22 is to

fasten and encapsulate a cable. Fastening refers to locking the cable by cable glands to prevent the

cable from axial displacement and radial rotation, so as to ensure the normal connection of the

cable. Encapsulating refers to IP protection, that is, dustproof and waterproof. The first lead device

15 or second lead device 22 can also be applied with shielded cable waterproof joints, and it is

suitable for cables with a shielding layer, armored cable waterproof joint for armored cables, and explosion-proof cable waterproofjoints for hazardous areas such as mines. In an embodiment of the present disclosure, referring to FIG. 17, the explosion-proof battery pack 10 may further include the third encapsulation layer 135 covering the second encapsulation layer 134, in which the third encapsulation layer 135 has a second opening at a location of the pressure relief valve 132, the second opening corresponds to the pressure relief valve 132 so that the pressure relief valve 132 can be subjected to venting through the second opening, and the impact strength of the third encapsulation layer 135 is greater than that of the first encapsulation layer 133. In an embodiment of the present disclosure, the first encapsulation layer 133, the second encapsulation layer 134 and the third encapsulation layer 135 fully fill the space between the battery module 13 and side walls and the bottom of the first explosion-proof container 11 to fit it with the container body 101 of the first explosion-proof container 11 tightly and to stabilize the battery module 13. In an embodiment of the present disclosure, the first encapsulation layer 133, the second encapsulation layer 134 and the third encapsulation layer 135 are silica gel or epoxy resin, which can simplify the manufacturing process of the encapsulation layer, and can ensure the better encapsulation protection effect, which has better practicality and applicability. The impact strength of the above-mentioned third encapsulation layer 135 is configured to be greater than that of the first encapsulation layer 133, so that the third encapsulation layer 135 can form the outermost protection as well as further protect the second encapsulation layer 134. That is to say, the third encapsulation layer may further enhance the protection function of the first and second encapsulation layers, and the damage degree of the second encapsulation layer can be effectively limited due to the protection and reinforcement effect of the third encapsulation layer. That is, the damage part can be limited at the pressure relief valve 132 to the greatest extent, which largely reduces the destructive influence on the first encapsulation layer and improves the reliability of the encapsulation explosion-proof protection method. In an embodiment of the present disclosure, it further includes a pressure sensor 16 arranged in the first explosion-proof container 11; the third pressure release device 17 arranged on the explosion-proof lid 102 of the first explosion-proof container 11, and configured to directly release the pressure in the first explosion-proof container 11 to the outside when the pressure in the first explosion-proof container 11 increases. It will be appreciated that a function of the pressure sensor

16 here is similar to that of the first pressure sensor 71 in the above embodiment, and is configured to collect the pressure in the container 111. The above-mentioned third pressure release device 17 may be, for example, a rupture disc, a flame arrester, a one-way valve or a combination of the flame arrester and the one-way valve, which is not limited. That is, an explosive risk caused by an excessive gas pressure in the first explosion-proof container 11 can be effectively avoided by monitoring a pressure situation in the first explosion proof container 11. In the embodiment, the battery module is configured in the first explosion-proof container, in which the battery module includes the first area and the second area, the first area includes all electrodes in the battery module, the second area includes all pressure relief valves in the battery module, and the power source control module is configured in the second explosion-proof container to realize the isolated configuration between the power source control module and the battery module, which can effectively reduce the influence on each other when the power control module occurs the deflagration accident and when the battery module fails, thus realizing the two level explosion-proof mechanism of the power source control module and the battery module, and effectively improving the safety and reliability of explosion-proof batteries and the level of explosion-proof protection. Taking the first container 110 as the normal container and the second container 120 as the explosion-proof container as an example, the description will be made with reference to FIG. 18 and FIG. 19. FIG. 18 is a schematic diagram showing an explosion-proof battery pack of another embodiment of the present disclosure. FIG. 19 is a schematic diagram showing an explosion-proof battery pack of another embodiment of the present disclosure. Referring to FIG. 18, the explosion-proof battery pack 10 may include the container 111 and the explosion-proof container 112 connected with the container 111; the battery module 13 arranged in the container 111, in which the battery module 13 includes the first area and the second area, the first area including all electrodes 131 and all parts exclude pressure relief valves of the battery cells in the battery module 13, and the second area including all pressure relief valves of the battery cells 132 in the battery module 13; the first encapsulation layer 133 covering the first area of the battery module 13, in which the first encapsulation layer 133 has the first opening, and the first opening corresponds to the pressure relief valve 132 so that the pressure relief valve 132 can be subjected to venting through the first opening; and the second encapsulation layer 134 covering at least the second area of the battery module 13, in which the impact strength of the second encapsulation layer 134 is smaller than that of the pressure relief valve when the pressure relief valve is opened, so that the second encapsulation layer 134 can be broken when the pressure relief valve 132 is opened; the power source control module 14 arranged in the explosion-proof container 112; and the first lead device 15 arranged between the explosion-proof container 112 and the container 111.

In the embodiment of the present disclosure, the explosion-proof battery pack 10 is taken as

mine operation, which is not limited.

In the embodiment of the present disclosure, the battery module 13 is configured in the

container 111, and an explosion-proof container 112 connected with the container 111 is

configured, and the power source control module 14 is configured in the explosion-proof container

112, so that the power source control module 14 can control all switching control units to be

disconnected when an explosive environment occurs, ensuring that other exposed conductors are

not charged, except for the encapsulated battery module 13, so that the contact between an ignition

source and the explosive gas is blocked from the source. However, only a container equipped with

the power control module 14 is arranged as the explosion-proof container 112, and a container

equipped with the battery module 13 is arranged as the normal container, which can effectively

reduce the cost and weight of the battery explosion-proof mechanism, not only realize an isolated

configuration of the power control module 14 and the battery module 13, but also effectively

improve the balance between the economy of the explosion-proof mechanism and the explosion

proof control effect.

The above-mentioned explosion-proof container 112 can be welded on the container 111, or

the explosion-proof container 112 can also be welded on a side of the container 111, or the

explosion-proof container 112 can also be a separate structure from the container 111, which is not

limited. The above-mentioned battery module 13 includes a battery pack, and a battery management

Referring to FIG. 2, a battery module can include the battery pack 201 composing of single lithium-ion battery cells connected in series or parallel and the battery management system and the protection unit 202 matching the battery pack. Referring to FIG. 3, the power source control module may include, for example, the electrical circuit switching unit 301 and the communication circuit switching unit 302.

certain number of fuses and manual mechanical switches.

When the concentration of explosive hazardous mixture in the environment is detected to

exceed the standard, the power source control module 14 can control all electrical circuit switching

units 301 and communication circuit switching units 302 to be disconnected, and then control the

battery management system and protection unit 202 to disconnect the electrical connection with

the power source control module, thus blocking the contact between an ignition source and an

explosive gas from the source.

In some embodiments of the present disclosure, the second encapsulation layer 134 also

covers the first area, and the impact strength of the second encapsulation layer 134 is smaller than

that of the first encapsulation layer 133.

In some embodiments of the present disclosure, referring to FIG. 19, the third encapsulation

layer 135 covers the second encapsulation layer 134, in which the third encapsulation layer 135

has the second opening at the location of the pressure relief valve 132, the second opening

to venting through the second opening, and the impact strength of the third encapsulation layer

135 is greater than that of the first encapsulation layer 133. That is, the third encapsulation layer

135 is an encapsulation layer covering the second encapsulation layer 134, which serves to protect

the second encapsulation layer 134 and the first encapsulation layer 133.

In some embodiments of the present disclosure, the first encapsulation layer 133, the second

encapsulation layer 134 and the third encapsulation layer 135 are silica gel or epoxy resin, which

can simplify the manufacturing process of the encapsulation layer, and can ensure the better

encapsulation protection effect, which has better practicality and applicability, or can be any other

possible encapsulation materials, which is not limited.

encapsulation layer 134 and the third encapsulation layer 135 fill the space between the battery module 13 and side walls and the bottom of the container 111 to fit it with the container body of the container 111 tightly and to stabilize the battery module 13.

It is understood that generally, the main potential ignition source of lithium-ion battery is the

charged part (for example, the electrodes 131 of the battery module 13 in the present disclosure),

that is, the positive and negative terminals of the single lithium-ion battery cells in the battery

module 13. Therefore, in the embodiment of the present disclosure, by covering the first area of

the battery module 13 with the first encapsulation layer 133, the effective protection of the

corresponding electrodes of the single battery cells is realized by the first encapsulation layer 133.

And the second encapsulation layer 134 covering at least the second area of the battery module 13

is arranged. The second encapsulation layer 134 not only protects the first layer of encapsulating

material, but also protects the pressure relief valve 132, thus realizing effective encapsulation

protection.

For example, after the battery module 13 is installed in the first explosion-proof container 11,

the battery module 13 and other supports (the first support 20) are encapsulated with the

encapsulation compound. The bottom and side of the encapsulation compound are tightly bonded

to the container 111, and a certain free space exists between the upper surface of the encapsulation

compound and the container lid 106.

In the embodiment of the present disclosure, the impact strength of the second encapsulation

layer 134 is configured to be smaller than that of the pressure relief valve when the pressure relief

valve is opened, so that the second encapsulation layer 134 can be broken when the pressure relief

valve 132 is opened, thus making it possible for the gas generated by an internal chemical reaction

of the battery in extreme cases to be discharged to an external environment via the third pressure

release device 17 arranged on the lid after being discharged to the container via the pressure relief

valve 132, thus avoiding the internal accumulation of gases in the container 111.

In an embodiment of the present disclosure, the first encapsulation layer 133 can effectively

protect the positive and negative terminals of the battery module 13, realize the effective isolation

of potential ignition sources and explosive gases, significantly reduce the occurrence probability

of extreme accidents such as combustion and explosion, and improve the safety protection

performance of the explosion-proof battery pack 10.

The impact strength of the above-mentioned third encapsulation layer 135 is configured to be

greater than that of the first encapsulation layer 133, so that the third encapsulation layer 135 can form the outermost protection as well as further protect the second encapsulation layer 134. That is to say, the third encapsulation layer may further enhance the protection function of the first encapsulation layer 133 and second encapsulation layer 134, and the damage degree of the second encapsulation layer 134 can be effectively limited due to the protection and reinforcement effect of the third encapsulation layer 135. That is, the damage part can be limited at the pressure relief valve 132 to the greatest extent, which largely reduces the destructive influence on the first encapsulation layer 133 and improves the reliability of the encapsulation explosion-proof protection method.

In some embodiments of the present disclosure, referring to FIG. 19, a container 111 may

include a container body 101 and an explosion-proof container body 104; a lid 106 and an

explosion-proof lid 105 arranged on the container body 101 and the explosion-proof container

body 104 respectively, in which the lid 106 is connected with the container body 101 by bolts 103

and the explosion-proof lid 105 is connected with the explosion-proof container body 104 by bolts

103, and a free space exists between an upper surface of the encapsulation layer covering the

battery module 13 in the container 111 and the container lid 106. 106. The explosion-proof

container lid 105 can be understood as a container lid with explosion-proof function.

A container body 101; a container lid 106 arranged on the container body 101, in which the

container lid 106 is connected with the container body 101 by bolts 103, and a free space exists

between the upper surface of the encapsulation layer covering the battery module 13 and the

container lid 106, which gives a certain buffer space for the gas pressure to gather, and also assist

in the configuration of other components (such as pressure sensors) to help enrich the explosion

proof function of the explosion-proof battery pack 10.

The above-mentioned container 11 can be considered as an encapsulation cavity, and the

above-mentioned explosion-proof container 112 connected with container 111 can be considered

as a wiring cavity, and the battery module 13 and the power source control module 14 are

electrically connected via a first lead device 15 between the container 111 and the explosion-proof

container 112.

A second lead device 22 is also arranged on the explosion-proof container 112, and is

configured to connect the explosion-proof battery pack 10 with an external circuit.

the second lead device 22 are composed of a certain number of cable glands.

In some embodiments, referring to the above-mentioned FIG. 2 and FIG. 19 together, the

battery module 13 is electrically connected with an electrical circuit switching unit 301 and a

switching unit 302 in the power source control module 14 are electrically connected with an

external electrical circuit and a communication circuit of the container 111 and the explosion-proof

container 112 via the second lead device 22, respectively.

The main function of the above-mentioned first lead device 15 or second lead device 22 is to

suitable for cables with shielding layer, armored cable waterproof joint for armored cables, and

explosion-proof cable waterproofjoints for hazardous areas such as mines.

In an embodiment of the present disclosure, referring to FIG. 19, an explosion-proof battery

pack 10 may further include a pressure sensor 16 arranged in the container 111; a third pressure

release device 17 arranged on the container lid 106 of the container 111, and configured to release

the pressure in the container 111 to the outside when the pressure in the container 111 increases. It

will be appreciated that the function of the pressure sensor 16 here is similar to that of the first

pressure sensor 71 in the above embodiment, and is configured to collect the pressure in the

container 111.

The above-mentioned third pressure release device 17 may be, for example, a flame arrester,

a one-way valve or a combination of a flame arrester and a one-way valve, or the third pressure

release device 17 may also be a combination structure of one or more flame arresters, which is not

limited.

The pressure sensor 16 is an apparatus or a device that can sense a pressure signal and can

convert the pressure signal into a usable output electrical signal according to a certain law.

In some embodiments of the present disclosure, referring to FIG. 19, the explosion-proof

battery pack 10 may further include a first support 20 arranged in the container 111, and configured

to support and stabilize the battery module 13; a second support 21 arranged in the explosion-proof

container 112, and configured to support and stabilize the power source control module 14. That is, the battery module 13 can be fixedly installed in the container 111 via the first support 20, and the power source control module 14 can be fixedly installed in the explosion-proof container 112 via the second support 20, thus effectively ensuring the stable installation performance of the battery module 13 and the power source control module 14. At the same time, it can facilitate the heat dissipation of the battery module 13 and the power source control module 14, effectively avoid the risk caused by over-high temperature of the battery module 13 and the power source control module 14, and effectively improve the overall safety performance of the explosion-proof battery pack 10 from the perspective of temperature control.

In the embodiment, the container and the explosion-proof container connected with the

container, the battery module arranged in the container, the first encapsulation layer covering the

first area of the battery module, and the second encapsulation layer covering at least the second

area of the battery module are configured for the explosion-proof battery pack. The encapsulation

the battery module. The explosion-proof protection for the power source control module is realized

by using the explosion-proof container, which can effectively reduce the cost and weight of the

battery explosion-proof mechanism, and ensure that in the presence of an explosive environment,

except for the encapsulated battery module, other exposed conductors are not charged, so as to

timely block the contact between an ignition source and an explosive gas, and effectively improve

the economy efficiency and explosion-proof control effect achieved by the explosion-proof

mechanism.

In the description of this specification, reference throughout this specification to "an

embodiment," "some embodiments," "one embodiment", "another example," "an example," "a

specific example," or "some examples," means that a particular feature, structure, material, or

characteristic described in connection with the embodiment or example is included in at least one

embodiment or example of the present disclosure. In the specification, the schematic

representation of the above terms is not necessarily referring 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, without

contradicting each other, those skilled in the art may combine and combine the different

embodiments or examples described in this specification and the features of the different embodiments or examples.

In addition, terms such as "first" and "second" are used herein for purposes of description

and are not intended to indicate or imply relative importance or significance or to imply the number

of indicated technical features. Thus, the feature defined with "first" and "second" may explicitly

or implicitly include at least one such feature. In the description of the present disclosure, "a

plurality of' means at least two, such as two, three, etc., unless specified otherwise.

Claims

What is claimed is:

1. An explosion-proof battery pack, characterized by comprising:

a first container and a second container;

a battery module arranged in the first container, wherein the battery module comprises a first

area and a second area, the first area comprises all electrodes in the battery module, and the second

area comprises all pressure relief valves in the battery module; and

a power source control module arranged in the second container.

2. The explosion-proof battery pack of claim 1, further comprising:

the first container and/or the second container being an explosion-proof container, the

explosion-proof container comprising:

a container body; and

an explosion-proof lid arranged on the container body, wherein the explosion-proof lid is

connected with the container body by bolts.

3. The explosion-proof battery pack of any one of claims I to 2, further comprising:

a first pressure release device arranged between the first container and the second container,

and configured to release the pressure in the first container to the second container; and

a second pressure release device arranged in the second container, and configured to release

the pressure in the second container to the outside.

4. The explosion-proof battery pack of any one of claims I to 3, further comprising:

a third pressure release device arranged on the container lid or the container body of the first

container, and configured to directly release the pressure in the first container to the outside when

the pressure in the first container increases.

5. The explosion-proof battery pack of any one of claims I to 4, further comprising:

a first encapsulation layer covering the first area of the battery module, wherein the first

encapsulation layer has a first opening, and the first opening corresponds to the pressure relief

valve so that the pressure relief valve is subjected to venting through the first opening; and

a second encapsulation layer covering at least the second area of the battery module, wherein

the impact strength of the second encapsulation layer is smaller than that of the pressure relief

valve when the pressure relief valve is opened, so that the second encapsulation layer can be broken

when the pressure relief valve is opened.

6. The explosion-proof battery pack of claim 5, characterized in that the second encapsulation layer further covers the first area, and the impact strength of the second encapsulation layer is smaller than that of the first encapsulation layer.

7. The explosion-proof battery pack of any one of claims I to 4, further comprising:

valve so that the pressure relief valve is subjected to venting through the first opening;

a protective cover covering the second area of the battery module, wherein a gap exists

between the protective cover and the pressure relief valve; and

a second encapsulation layer covering the protective cover in the second area of the battery

module, wherein the impact strength of the second encapsulation layer is smaller than that of the

pressure relief valve when the pressure relief valve is opened, so that the second encapsulation

layer can be broken when the pressure relief valve is opened.

8. The explosion-proof battery pack of any one of claims 5 to 7, further comprising:

a third encapsulation layer covering the second encapsulation layer, wherein the third

encapsulation layer has a second opening at a location of the pressure relief valve, the second

opening corresponds to the pressure relief valve so that the pressure relief valve is subjected to

venting through the second opening, and the impact strength of the third encapsulation layer is

greater than that of the first encapsulation layer.

9. The explosion-proof battery pack of any one of claims 5 to 7, characterized in that the first

encapsulation layer, the second encapsulation layer and the third encapsulation layer fully fill the

space between the battery module and side walls and the bottom of the first container to fit it with

the container body of the first container tightly and to stabilize the battery module.

10. The explosion-proof battery pack of any one of claims 8 to 9, characterized in that the

first encapsulation layer, the second encapsulation layer and the third encapsulation layer are silica

gel or epoxy resin.

11. The explosion-proof battery pack of any one of claims 5 to 10, characterized in that a free

space exists between the encapsulation layer covering the battery module and the container lid of

the first container.

12. The explosion-proof battery pack of any one of claims 1 to 11, further comprising:

a first pressure sensor arranged in the first container; and

a second pressure sensor arranged in the second container, wherein a pressure threshold of the second pressure sensor is less than that of the first pressure sensor.

13. The explosion-proof battery pack of any one of claims I to 12, further comprising:

the battery module and the power source control module being electrically connected via a

first lead device between the first container and the second container; and

a second lead device arranged on the second container so that the power source control

module is electrically connected with external circuits.

14. The explosion-proof battery pack of any one of claims I to 13, further comprising:

a first support arranged in the first container, and configured to support and stabilize the

battery module; and

a second support arranged in the second container, and configured to support and stabilize the

power source control module.