WO2020019570A1 - Battery system and control method - Google Patents

Abstract

A battery system, comprising: a housing (100), enclosing an accommodating space (110); a separator (200), provided in the housing (100) and separating the accommodating space (110) into a battery region (112) and an isolation region (114); a plurality of vent holes (210), formed in the surface of the separator (200); a plurality of sealing bodies (220), each sealing body (220) sealing one vent hole (210); a plurality of battery cells (300), provided in the battery region (112), each battery cell (300) being provided opposite to one vent hole (210); and safety valves (310), provided on the surfaces of the battery cells (300) and provided opposite to the vent holes (210). The battery system improves the safety of a battery module, and reduces potential safety hazards. Also provided are a fire suppression method for thermal runaway of a battery, and an identification method for thermal runaway battery cells.

Description

Battery system and control method

Related applications

This application claims priority from a Chinese patent application filed on July 27, 2018, with application number 201810840375.7, entitled "Battery System and Application Method", which is hereby incorporated by reference in its entirety.

Technical field

The present application relates to the field of battery technology, and in particular, to a battery system and an application method thereof.

Background technique

In recent years, the market share of electric vehicles has steadily increased. Lithium-ion batteries have excellent performance such as high voltage, high specific energy, long cycle life, and no pollution to the environment. They have attracted great attention from the electric vehicle industry, and have gained certain applications. However, during the thermal runaway process of lithium-ion batteries, the electrolyte will be evaporated to form electrolyte vapors and produce combustible gas mixtures, such as H ₂ , CO, and CH ₄ , which will accumulate inside the battery. After the battery reaches a certain pressure limit, the safety valve opens, and the combustible mixture is released into the external environment as the battery erupts. During the eruption of the battery, the surface temperature of the battery can reach a maximum of about 1000 ° C, and the internal temperature of the battery cell is higher, often accompanied by Mars, and its surface temperature is about 600 to 1200 ° C. Because the high temperature surface of the battery and the temperature of Mars are much higher than the ignition temperature of the gaseous eruption, once the eruption is sprayed into the air and contacts with oxygen, it will be very easy to catch fire and cause a fire. After the battery erupts, high-temperature combustibles are also prone to spontaneous combustion after coming into contact with the air entering the battery. In addition, even if the gaseous eruption does not catch fire after the battery erupts, if it gradually accumulates to a certain amount, an explosion may occur and its harm will be greater. Therefore, battery eruption is one of the hidden dangers of lithium ion battery fire and even explosion accidents. Fire and explosion accidents caused by thermal runaway of lithium-ion batteries are frequently reported, and safety issues have become one of the main factors hindering their large-scale commercial application in the power supply industry.

When a hard-shell lithium battery is thermally out of control, substances emitted from the safety valve will endanger other normal cells, and it is difficult for traditional battery systems to prevent and control the thermal out of control failure of the faulty cell.

Application content

Based on this, it is necessary to provide a battery system and an application method thereof for the problem that it is difficult to prevent and control the thermal runaway hazard of a faulty cell in the conventional battery system.

A battery system includes:

A shell that surrounds a receiving space;

A partition plate disposed in the casing and dividing the accommodating space into a battery area and an isolation area;

A plurality of ventilation holes opened on the surface of the partition plate;

A plurality of sealing bodies, each of which seals one of the vent holes;

A plurality of battery cells are disposed in the battery area, and each of the battery cells is disposed opposite one of the vent holes;

A safety valve is disposed on the surface of the battery cell and is opposite to the vent hole.

In one embodiment, the separator includes a heat insulation layer, and the heat insulation layer is made of a heat insulation material.

In one embodiment, the separator includes an anti-corrosion layer, which is disposed on a side of the separator close to the isolation area, and the anti-corrosion layer is made of an anti-corrosion material.

In one embodiment, the anti-corrosion layer is a corrosion-resistant metal layer.

In one embodiment, the sealing body is a cover that covers an end of the vent hole away from the battery cell.

In one embodiment, the vent hole is a conical hole, and an opening diameter of the conical hole near the isolation region is larger than an opening diameter of the conical hole.

In one embodiment, a diameter of an opening of the vent hole close to the battery cell is less than or equal to a diameter of the battery cell.

In one embodiment, the diameter of the opening of the vent hole close to the battery cell is 18 mm.

In one embodiment, the cone angle of the conical hole is 10 °.

In one embodiment, the plurality of vent holes are arranged in a lattice pattern on the surface of the partition.

In one embodiment, the battery system includes:

An inductor, which is installed on the inner wall of the casing and is disposed in the isolation area, and the inductor is used for sensing an emissive of a battery cell;

A controller connected to the sensor;

A dilution device is connected to the controller and stores a dilution gas.

In one embodiment, the sensor includes:

A plurality of light sources and a plurality of light receivers, each light source is disposed opposite one of the light receivers, and the light of each of the light sources is correspondingly received by the light receivers opposite to the light source, the plurality of The vent holes are arrayed on the surface of the partition, and each row of the vent holes and each column of the vent holes have at least one light emitted by the light source.

In one embodiment, the light source is monochromatic light.

In one embodiment, a plurality of the light receivers are respectively electrically connected to the controller.

In one embodiment, the distance between the safety valve and the light emitted by the light source is 2 cm-6 cm.

In one embodiment, the diluent gas is an inert gas.

In one embodiment, the dilution device is disposed outside the casing and communicates with the isolation region.

A method for suppressing thermal runaway of a battery, including the following steps:

Sensing the environmental change of the isolated area, and transmitting the environmental change information;

Acquiring the environmental change information;

Determine whether the battery thermal runaway occurs;

When it is judged that the battery thermal runaway occurs, the dilution device is controlled to release the dilution gas;

When it is judged that there is no thermal runaway of the battery, there is no action.

A method for identifying a thermal runaway battery cell includes the following steps:

Receiving the light intensity change, and transmitting the light intensity change information;

The light intensity change information is acquired, and the position of the light intensity change area, that is, the position of the thermal runaway battery cell is calculated according to the position of the light receiver transmitting the light intensity change information.

In one embodiment, the acquiring the light intensity change information and calculating a position of the light intensity change area according to a position of a light receiver transmitting the light intensity change information includes:

The light intensity threshold is preset, and when the obtained light intensity change reaches the light intensity threshold, it is determined that a thermal runaway of the battery is generated.

The above battery management system includes a casing, a separator with a vent hole and a sealing body, and a battery cell provided in a battery area separated from the separator, and the safety valve of the battery cell is aligned with the vent hole. . When the battery cell is thermally out of control, the sealing body is punched open, so that the eruptions generated by the thermal out of control enter the isolation area separated by the separator. The separator can isolate the eruption of the thermal runaway battery cell from other non-runaway battery cells, avoiding a chain reaction that causes thermal runaway, greatly improving the safety of the battery module, and reducing potential safety hazards.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present application or the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely It is an embodiment of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the disclosed drawings without paying creative labor.

1 is a cross-sectional view of a battery system according to an embodiment of the present application;

2 is a top view of a battery system according to an embodiment of the present application;

3 is a structural connection diagram of a fire suppression system of a battery system provided by an embodiment of the present application;

4 is a step of a method for suppressing thermal runaway of a battery according to an embodiment of the present application;

FIG. 5 is a flowchart of a method for identifying a thermal runaway battery cell according to an embodiment of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

10 battery system

100 shell

110 space

112 battery area

114 quarantine area

200 partitions

210 vents

220 sealed body

230 thermal insulation layer

240 anticorrosive layer

300 battery cells

310 safety valve

400 sensor

410 light source

420 light receiver

500 controller

600 dilution device

detailed description

In the following, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of the present application is only for the purpose of describing specific embodiments, and is not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1, an embodiment of the present application provides a battery system 10. The battery system 10 includes a housing 100, a partition plate 200 having a plurality of vent holes 210 and a plurality of sealing bodies 220, and a plurality of safety valves 310. Battery cell 300. The casing 100 surrounds a receiving space 110. The separator 200 is disposed in the casing 100 and divides the receiving space 110 into a battery region 112 and an isolation region 114. The plurality of ventilation holes 210 are opened on the surface of the partition plate 200. Each of the sealing bodies 220 closes one of the vent holes 210. The plurality of battery cells 300 are disposed in the battery region 112, and each of the battery cells 300 is disposed opposite one of the vent holes 210. The safety valve 310 is disposed on the surface of the battery cell 300 and is opposite to the vent hole 210.

The battery cell 300 emits high-temperature gas when the thermal runaway occurs. It can be understood that the material of the casing 100 may be a high-temperature resistant material. In one embodiment, the material of the casing 100 is not limited, as long as it can maintain the shape, and the inner wall of the casing 100 is coated with a high-temperature-resistant coating. In one embodiment, the accommodating space 110 surrounded by the casing 100 may be a closed space, which can protect the internal structure on the one hand, and prevent the toxic and combustible gas from being diffused to the external environment after the thermal runaway of the battery. The shape of the casing 100 is not limited, and can be designed according to actual needs.

In one embodiment, the separator 200 is fixed to the inner wall of the casing 100 and tightly connected to the inner wall of the casing 100 to completely isolate the battery region 112 from the isolation region 114. It can be understood that a plurality of the vent holes 210 penetrates the separator 200 to communicate the battery region 112 and the isolation region 114. Each of the vent holes 210 is sealed with a sealing body 220 to isolate the battery region 112 from the isolation region 114. It can be understood that the separator 200 can be made of a high temperature resistant material. In one embodiment, the sealing body 220 may be a plug body plugged in the vent hole 210 or a cover body covering the opening of the vent hole 210.

In one embodiment, the battery cell 300 may be a lithium battery. In one embodiment, the battery cell 300 may be a hard-shell battery. In one embodiment, the battery cell 300 may be a cylindrical lithium-ion battery or a rectangular shell-shaped lithium-ion battery. A safety valve 310 on the surface of each of the battery cells 300 is opposite to one of the ventilation holes 210. When the battery cells 300 are out of control, the safety valve 310 is opened, and the battery eruption will directly flush into the The vent hole 210 punches the sealing body 220 and enters the isolation region 114. In order to facilitate the separation of the sealing body 220 from the vent hole 210, in one embodiment, the sealing body 220 may seal the vent hole 210 by a small amount of glue. It can be understood that the sealing body 220 may be a high temperature resistant material. In one embodiment, the vent hole 210 is in close contact with the surface of the battery cell 300, and the opening of the vent hole 210 surrounds the safety valve 310, so that the eruption of the battery cell 300 and other The battery cells 300 are isolated and easily enter the ventilation holes 210. In one embodiment, the safety valve 310 may be disposed on the top of the battery cell 300, and further, may be disposed on the center of the top of the battery cell 300. In one embodiment, the center of the opening of the vent hole 210 faces the center of the top of the battery cell 300.

In this embodiment, when the battery cell 300 is thermally out of control, the sealing body 220 is punched open, so that the thermally controlled eruptive matter enters the isolation region 114 separated by the separator 200. The separator 200 can isolate the eruption of the thermal runaway battery cell 300 from other non-thermal runaway battery cells 300, reduce the possibility of thermal runaway propagation, greatly improve the safety of the battery module, and reduce Hidden safety hazards.

According to the current experimental observation phenomenon, the setting value of the opening pressure of the hard-shell battery safety valve will cause two eruption processes. The first eruption process is mainly due to the formation of vapor from the electrolyte to open the safety valve. The eruption product is mainly composed of the electrolyte vapor. At this time, the battery temperature is relatively low and the combustible gas concentration is low, which makes it difficult to burn. The products of the second eruption are mainly the gases reacted by the positive and negative electrodes and the binder. At this time, the temperature is high and the concentration of combustible gas is relatively high, which easily leads to combustion.

In one embodiment, the separator 200 includes a thermal insulation layer 230. The heat insulation layer 230 is made of a heat insulation material. In one embodiment, the separator 200 may be made of a heat insulating material. In one embodiment, the thermal insulation layer 230 may be a vacuum thermal insulation board or thermal insulation cotton or aerogel felt. In this embodiment, the heat insulation layer 230 can isolate the temperature of the battery eruption, thereby preventing the uncontrolled battery cell 300 from being threatened by high temperature.

In one embodiment, the separator 200 includes an anticorrosive layer 240. The anticorrosive layer 240 is disposed on a side of the separator 200 near the isolation region 114, and the anticorrosive layer 240 is made of an anticorrosive material. The gas emitted from the thermal runaway of the battery cell 300 is often corrosive. The anti-corrosion layer 240 is used to prevent the battery eruption from corroding the separator 200. In one embodiment, the anti-corrosion layer 240 is provided on a side of the separator 200 near the isolation region 114, and the heat-shielding layer 230 is provided on a side near the battery region 112, which can prevent corrosion and prevent Isolate the temperature.

In one embodiment, the anti-corrosion layer 240 may be a corrosion-resistant metal layer. That is, the function of preventing corrosion can be achieved, and the strength of the partition plate 200 can be strengthened to make the partition plate 200 stronger.

In one embodiment, the sealing body 220 is a cover covering an end of the vent hole 210 away from the battery cell 300. It can be understood that the diameter of the cover is larger than the diameter of the opening of the vent hole 210 near the isolation region 114. The vent hole 210 can be closed by covering the vent hole 210 with a cover. Further, a sealant may also be applied on a contact surface between the cover and the partition plate 200. In this embodiment, a cover is used as the sealing body 220, which is easy to install and easy to be punched out by a battery eruption.

In one embodiment, the vent hole 210 is a conical hole, and an opening diameter of the conical hole near the isolation region 114 is larger than an opening diameter of the conical hole 210 near the battery region 112.

In one embodiment, a diameter of an opening of the vent hole 210 near the battery cell 300 may be smaller than or equal to a diameter of the battery cell 300. In an embodiment, an opening diameter of the vent hole 210 near the battery cell 300 may be 18 mm. It can be understood that the cross section of the conical hole perpendicular to the opening direction of the conical hole is trapezoidal. In one embodiment, the taper angle of the conical hole may be 10 °. In one embodiment, the taper angle of the conical hole may be 10 ° -15 °.

In this embodiment, the tapered hole can reduce the diameter of the opening of the separator 200 close to the battery cell 300, thereby enhancing the structural strength of the separator 200. The battery erupted in a fan shape, and the diameter of the battery eruption gradually increased with time. When the battery eruption meets the inner wall of the conical hole, a reflection is generated, and the upward direction of the reflection component is more, so that the battery eruption enters the isolation region 114 faster. At the same time, the gas emitted by the battery is affected by the viscous force, and after being reflected by the inner wall of the conical hole, the oblique motion is performed in a direction close to the inner wall of the conical hole, so that the gas emitted by the battery enters the isolation region 114. Reduce backflow.

Please refer to FIG. 3 together. In one embodiment, the battery system 10 includes an inductor 400, a controller 500, and a dilution device 600. The sensor 400 is installed on an inner wall of the casing 100 and is disposed in the isolation region 114. The sensor 400 is used to sense the eruption of the battery cell 300. The controller 500 is connected to the sensor 400. The dilution device 600 is connected to the controller 500 and stores a dilution gas.

In one embodiment, the sensor 400 may be a barometric pressure sensor, which may sense a barometric pressure change in the isolation region 114 and convert the barometric pressure change into an electrical signal and transmit the signal to the controller 500. The sensor 400 may also be configured to monitor the temperature, sound, and image of the isolation region 114 to erupt the sensor battery, and then convert the data change into an electrical signal to the controller 500. It can be understood that the controller 500 has a data processing function, and can determine whether a battery thermal runaway occurs according to an electrical signal transmitted by the inductor 400. When the controller 500 determines that a thermal runaway of the battery occurs, the controller 500 may be controlled to release the dilution gas to dilute the battery eruption gas. In one embodiment, the controller 500 may be a battery management system.

In one embodiment, the diluent gas may be an inert gas. The inert gas includes CO ₂ , N ₂ , Ar, and the like. The principle is to use the dilution and thermal effects of diluent gases such as CO ₂ , N ₂ , Ar, etc. to change the ignition limit and temperature of the battery eruption, respectively, thereby reducing its flammability. The dilution ratio can be defined as the ratio of the molar amount of the diluted gas to the molar amount of the eruption. With the increase of the dilution ratio, the upper and lower limits of the combustion of the mixture are increasing, and the flammability of the mixture is reduced and tends to be non-combustible. In addition, as the dilution ratio increases, the heat capacity of the mixed gas increases greatly, resulting in a decrease in its maximum temperature, so the probability of gas ignition decreases.

In one embodiment, the dilution device 600 may be disposed outside the casing 100 and communicate with the isolation region 114. The dilution device 600 is disposed outside the casing 100 and communicates with the isolation region 114. In one embodiment, the dilution device 600 is disposed in the casing 100. In one embodiment, the dilution device 600 communicates with the isolation region 114 through a pipe.

When the battery is thermally out of control, high temperature eruption gas enters the isolation zone 114, which will cause the pressure and temperature of the isolation zone 114 to change, and also generate sound. In this embodiment, the controller 500 can sense whether the normal state (such as air pressure, temperature, sound, etc.) of the isolation region 114 is damaged by the sensor 400 to determine whether thermal runaway occurs, thereby controlling all The dilution device 600 releases a dilution gas to prevent combustion of the battery eruption. The battery eruption is concentrated through the isolation area 114 provided on the partition plate 200, which is more convenient to monitor the environmental changes caused by the battery eruption, so that the flame retardant treatment is performed faster and the hidden safety hazard is reduced.

Please refer to FIG. 2 together. In one embodiment, the sensor 400 includes a plurality of light sources 410 and a plurality of light receivers 420, each light source 410 is disposed opposite to one of the light receivers 420, and the light of each of the light sources 410 is composed of The light source 410 is correspondingly received by the light receiver 420, and the plurality of vent holes 210 are arrayed on the surface of the partition plate 200. Each row of the vent holes 210 and each column of the vent holes 210 have openings respectively. There is at least one light emitted from the light source 410.

It can be understood that the light source 410 may be a unidirectional light source. In one embodiment, the light emitted by the light source 410 may be a laser. The high concentration of gas emitted by the battery will affect the transmission of light. It can be understood that the light receiver 420 can sense a change in the light emitted by the light source 410, convert the change in the light into an electrical signal, and transmit the change to the controller 500. In one embodiment, a plurality of the light receivers 420 may be electrically connected to the controller 500 respectively. In one embodiment, the plurality of light sources 410 and the plurality of light receivers 420 may be fixed to an inner wall of the casing 100.

It can be understood that, from a top perspective, the light emitted by the plurality of light sources 410 constitutes a grid, and each of the ventilation holes 210 is disposed opposite to an intersection of at least one of the grids. In one embodiment, the intersection point of the light grid is opposite to the center point of the opening of the vent hole 210. In one embodiment, one of the ventilation holes 210 may be provided with a plurality of light beams crossing. In one embodiment, a plurality of light rays corresponding to one of the vent holes 210 may be set at the same height or at different heights in a direction perpendicular to the partition plate 200. In one embodiment, the plurality of vent holes 210 are arranged in a lattice pattern on the surface of the partition plate 200.

In one embodiment, the distance between the safety valve 310 and the light emitted by the light source 410 may be 2cm-6cm, which can make the gas emitted by the battery more easily sensed by the light. The thickness of the separator 200 may be less than or equal to 2 cm.

In this embodiment, by providing multiple sets of the light source 410 and the light receiver 420 opposite to each other, the light emitted by the multiple light sources 410 passes through each row of the vent holes 210 and each column of the vent holes 210, A plurality of rays cross each of the vent holes 210. When the battery emits gas, it can affect at least two crossing lights, so that at least two of the light sensors 420 receive light change signals. The controller 500 can determine which of the vent holes 210 has a battery erupting gas, that is, which of the battery cells 300 is out of control, by the position of the light sensor 420 receiving the change in light.

In one embodiment, the light emitted by the light source 410 is monochromatic light. According to the lambert-beer law, it is possible to accurately know the effect of different concentrations of gas on light intensity. Therefore, a threshold value can be set, and the controller 500 determines that a thermal runaway of the battery is caused when the change in the light intensity received by the light receiver 420 reaches the threshold value. In this embodiment, the misjudgment of thermal runaway of the battery can be avoided, and at the same time, it is more digital and accurate, which is beneficial to large-scale applications.

Please refer to FIG. 4 together. The application also provides a method for suppressing thermal runaway of a battery, including the following steps:

S10. Sensing an environmental change in the isolation region 114 and transmitting the environmental change information.

S20. Acquire the environment change information.

S30. Determine whether a thermal runaway of the battery occurs;

S40. When it is judged that the battery thermal runaway occurs, the dilution device 600 is controlled to release the dilution gas;

S50. When it is judged that no thermal runaway of the battery occurs, no action is performed.

In step S10, the environmental change information includes changes in information such as air pressure, temperature, sound, and object position. Can be monitored by air pressure sensor, temperature sensor, sound sensor and image sensor. In step S20 and step S30, the controller 500 can obtain the environmental change information and determine whether a battery thermal runaway occurs. A specific determination program is stored in the controller 500.

Please refer to FIG. 5 together. The present application also provides a method for identifying a thermal runaway battery cell, which includes the following steps:

S100. Receive light intensity change information and transmit the light intensity change information.

S200. Obtain the light intensity change information, and calculate the position of the light intensity change area, that is, the position of the thermally out of control battery cell, according to the position of the light receiver 420 transmitting the light intensity change information.

In step S200, the light receivers 420 may be numbered for each row and each column, and the vent holes 210 are corresponding to the numbers of the rows and columns. The controller 500 may be used to obtain the light intensity change information, and obtain the number of rows and columns of the vent holes 210 according to the number of rows and columns of the light receiver 420 transmitting the light intensity change information, thereby determining the generation of battery heat. Out of control battery cell 300 location.

In one embodiment, the step S200 includes a step S210 to preset a light intensity threshold, and when the acquired light intensity change reaches the light intensity threshold, it is determined that a thermal runaway of the battery has occurred. In this embodiment, the misjudgment of thermal runaway of the battery can be avoided, and at the same time, it is more digital and accurate, which is beneficial to large-scale applications.

Finally, it should be noted that in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between OR operations. Moreover, the terms "including", "comprising", or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements but also those that are not explicitly listed Or other elements inherent to such a process, method, article, or device. Without more restrictions, the elements defined by the sentence "including a ..." do not exclude the existence of other identical elements in the process, method, article, or equipment including the elements.

The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts between the embodiments, refer to each other.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, this application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (20)

A battery system, including: A housing (100) surrounding a receiving space (110); A partition plate (200) arranged in the casing (100) and dividing the accommodating space (110) into a battery area (112) and an isolation area (114); A plurality of vent holes (210) are opened on the surface of the partition plate (200); A plurality of sealing bodies (220), each of which seals one of the vent holes (210); A plurality of battery cells (300) are disposed in the battery area (112), and each of the battery cells (300) is disposed opposite one of the vent holes (210); A safety valve (310) is disposed on the surface of the battery cell (300) and is opposite to the vent hole (210). The battery system according to claim 1, wherein the separator (200) includes a heat insulation layer (230), and the heat insulation layer (230) is made of a heat insulation material. The battery system according to claim 1, wherein the separator (200) includes an anticorrosive layer (240), and the anticorrosive layer is disposed on a side of the separator (200) near the isolation region (114). The layer (240) is made of a corrosion-resistant material. The battery system according to claim 3, wherein the anticorrosive layer (240) is a corrosion-resistant metal layer. The battery system according to claim 1, wherein the sealing body (220) is a cover covering an end of the vent hole (210) remote from the battery cell (300). The battery system according to claim 1, wherein the vent hole (210) is a conical hole, and an opening diameter of the conical hole near the isolation region (114) is larger than an opening near the battery region (112) diameter. The battery system according to claim 6, wherein a diameter of an opening of the vent hole (210) near the battery cell (300) is smaller than or equal to a diameter of the battery cell (300). The battery system according to claim 7, wherein an opening diameter of the vent hole (210) near the battery cell (300) is 18 mm. The battery system according to claim 7, wherein a taper angle of the tapered hole is 10 °. The battery system according to claim 1, wherein the plurality of vent holes (210) are arranged in a lattice pattern on a surface of the separator (200). The battery system according to claim 1, comprising: An inductor (400) installed on an inner wall of the casing (100) and disposed in the isolation area (114); the inductor (400) is used for sensing an eruptive substance of a battery cell (300); A controller (500) connected to the sensor (400); A dilution device (600) is connected to the controller (500) and stores a dilution gas. The battery system according to claim 11, wherein the inductor (400) comprises: A plurality of light sources (410) and a plurality of light receivers (420), each light source (410) is disposed opposite to one of the light receivers (420), and the light of each of the light sources (410) is connected with the light The light receiver (420) opposite to the light source (410) is correspondingly received. The plurality of vent holes (210) are arrayed on the surface of the partition plate (200). Each row of the vent holes (210) and each column are Each of the openings of the vent holes (210) has at least one light emitted by the light source (410). The battery system according to claim 12, wherein the light emitted by the light source (410) is monochromatic light. The battery system according to claim 12, wherein a plurality of the light receivers (420) are electrically connected to the controller (500), respectively. The battery system according to claim 12, wherein a distance between the safety valve (310) and light emitted from the light source (410) is 2cm-6cm. The battery system according to claim 11, wherein the diluent gas is an inert gas. The battery system according to claim 11, wherein the dilution device (600) is disposed outside the casing (100) and communicates with the isolation region (114). A method for suppressing thermal runaway of a battery, including the following steps: Sensing the environmental change in the isolation area (114), and transmitting the environmental change information; Acquiring the environmental change information; Determine whether the battery thermal runaway occurs; When it is judged that the battery thermal runaway occurs, the dilution device (600) is controlled to release the dilution gas; When it is judged that there is no thermal runaway of the battery, there is no action. A method for identifying a thermal runaway battery cell includes the following steps: Receiving the light intensity change information and transmitting the light intensity change information; Acquire the light intensity change information, and calculate the position of the light intensity change area, that is, the position of the thermal runaway battery cell, according to the position of the light receiver (420) transmitting the light intensity change information. The method for identifying a thermal runaway battery cell according to claim 19, wherein said acquiring said light intensity change information and calculating said light intensity (420) based on a position of a light receiver (420) transmitting said light intensity change information Location of light intensity change areas, including: The light intensity threshold is preset, and when the obtained light intensity change reaches the light intensity threshold, it is determined that a thermal runaway of the battery is generated.

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