CN219497970U - Battery and electricity utilization device - Google Patents

Abstract

The application discloses battery and power consumption device, battery include the battery box and have the battery monomer of explosion-proof valve, and the battery monomer holds in the battery box, and the battery box includes the nonmetal plate body, and the part of nonmetal plate body is formed with the guard zone, and the guard zone sets up to multilayer structure, and multilayer structure includes first structural layer and sets up the insulating layer in one side of first structural layer, and the single explosion-proof valve of battery sets up in one side that the insulating layer deviates from first structural layer. According to the scheme, the battery box is arranged to comprise the nonmetal plate body, the weight of a battery is reduced, meanwhile, the protection area with the multilayer structure is arranged in the part of the nonmetal plate body, the protection area is used for blocking high-temperature fluid sprayed out of the battery from the battery explosion-proof valve in the battery box, so that the cover body is prevented from being broken down integrally when the battery is in thermal runaway, the tightness of the battery box of the cover body is improved, and the risk of ignition is reduced.

Description

Battery and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery and an electric device.

Background

The battery is used as a power unit of the electric automobile, and is mainly integrated on the automobile body in the form of a battery pack or a battery module. The battery generally includes a battery case and a battery cell disposed within the battery case. In order to reduce the quality of the battery, the related art sets the cover of the battery case as a nonmetallic member. However, when the battery is extruded or the battery monomer is in short circuit and the like, thermal runaway of the battery is easy to cause, and when the battery is in thermal runaway, the battery monomer can jet out high-temperature fluid, and the high-temperature fluid is easy to break through the cover body of the battery box, so that gas outside the battery can enter the battery box, the risk of ignition of the battery is increased, and the operation safety of the electric automobile is further influenced.

Disclosure of Invention

In view of the above, embodiments of the present application provide a battery and an electric device, which aim to alleviate the problem that the battery is liable to fire when thermal runaway.

In a first aspect, an embodiment of the present application provides a battery, including battery box and have explosion-proof valve's battery monomer, the battery monomer holds in the battery box, the battery box includes the nonmetal plate body, the part of nonmetal plate body is formed with the guard zone, the guard zone sets up to multilayer structure, multilayer structure includes first structural layer and sets up the insulating layer of one side of first structural layer, the explosion-proof valve of battery monomer sets up the insulating layer deviates from one side of first structural layer.

The battery box that this application embodiment provided includes the nonmetal plate body, through setting up the at least part of battery box to the nonmetal plate body, can reduce the whole weight of battery box, and then reduce the weight of battery. The non-metal plate body is provided with a protection area, the explosion-proof valve of the battery unit is arranged on one side of the protection area, and the protection area is used for blocking high-temperature fluid sprayed out of the explosion-proof valve of the battery unit. Specifically, this guard zone sets up to multilayer structure, this multilayer structure includes insulating layer and first structural layer, the insulating layer sets up in one side of first structural layer, the explosion-proof valve sets up in one side that the insulating layer deviates from first structural layer, the insulating layer is used for separation high temperature fluidic heat transfer for first structural layer, like this, when battery monomer sprays high temperature fluid, high temperature fluid reachs the insulating layer earlier, the setting of insulating layer can block high temperature fluidic heat transfer for first structural layer, thereby carry out thermal protection to first structural layer, prevent that multilayer structure from being destroyed entirely, and then guarantee the closure of battery box, reduce the risk of battery firing. Further, the high-temperature fluid sprayed by the explosion-proof valve is blocked in a targeted manner by utilizing the multilayer structure arranged in the local area of the non-metal plate body, so that the weight of the non-metal plate body is prevented from being increased due to the fact that the whole non-metal plate body is arranged in the multilayer structure, and the weight of the battery can be reduced; meanwhile, only the local area of the nonmetal plate body is set to be of a multi-layer structure, so that materials can be saved, and the cost of the battery is reduced.

In some embodiments, the multilayer structure further comprises a second structural layer located on a side of the insulating layer facing away from the first structural layer.

Through increasing the second structural layer in multilayer structure, first structural layer and second structural layer set up respectively in the both sides of insulating layer, and the insulating layer is located multilayer structure's centre, utilizes first structural layer and second structural layer to carry out centre gripping and cladding to the insulating layer to realize fixing the insulating layer, promote multilayer structure's stability and joint strength.

In some embodiments, the thickness of the first structural layer is greater than the thickness of the second structural layer.

Through being greater than the thickness of second structural layer with the thickness of first structural layer, promote the structural strength of first structural layer under the fixed prerequisite of bearing and encapsulation to the insulating layer is realized to the assurance second structural layer, promote the non-metal plate body at the bearing performance of battery monomer thermal runaway in-process structure, reduce the probability that the battery fires.

In some embodiments, the second structural layer has a thickness of 0.2mm to 0.5mm.

Through setting the thickness of second structural layer to 0.2mm ~0.5mm, the non-metal plate body's quality is lighter when guaranteeing that the second structural layer has good bearing and encapsulation fixed action to the insulating layer.

In some embodiments, the first structural layer has a thickness of 1mm to 2mm.

Through setting the thickness of first structural layer to 1mm ~2mm, can keep higher structural strength so that the non-metal plate body can not appear structural failure and inefficacy under the high atmospheric pressure condition at the in-process that guarantees first structural layer at battery cell thermal runaway the non-metal plate body's quality is lighter.

In some embodiments, the thickness of the insulating layer is 0.5mm to 2mm.

Through setting the thickness of insulating layer to 0.5mm ~2mm, the non-metal plate body's quality is lighter when guaranteeing that the insulating layer has good heat protection to first structural layer.

In some embodiments, the insulating layer is a foam structural layer.

Because contain a large amount of clearances in the foam structure layer, can pack the air in the clearance, the coefficient of heat conductivity of air is extremely low to make the thermal-insulated effect on foam structure layer promote, and then promote the thermal protection effect to first structural layer.

In some embodiments, the insulating layer is a thermosetting resin layer.

Through setting the insulating layer as the thermosetting resin layer, because thermosetting resin has heat resistance height, is difficult for deformation by the pressurized to promote the upper limit that the insulating layer can bear the temperature, and thermosetting resin can normally take place carbonization rather than melting under the high temperature effect, thereby the insulating layer can continue to separate high temperature fluid, promotes the structural stability of first structural layer.

In some embodiments, the thermosetting resin layer has thermally insulating particles dispersed therein.

By adding heat insulating particles into the thermosetting resin layer, the heat conduction insulating capability of the thermosetting resin layer is improved.

In some embodiments, the thermally insulating particles comprise at least one of expanded graphite particles, ceramic particles.

By adding at least one of expanded graphite particles and ceramic particles into the thermosetting resin layer, the heat conduction isolation capability of the thermosetting resin layer can be effectively improved.

In some embodiments, the nonmetallic plate body is a resin plate body, and the second structural layer and/or the first structural layer is a resin layer.

By arranging the nonmetallic plate body into the resin body, the overall weight of the nonmetallic plate body is lighter, and meanwhile, the nonmetallic plate body is more convenient to prepare and the material cost is low.

In some embodiments, the multilayer structure is an integrally formed arrangement.

Through setting up multilayer structure as integrated into one piece setting, promote the cohesiveness of each structural layer in the multilayer structure, do benefit to the intensity that strengthens multilayer structure, and then promote the life of nonmetal plate body.

In some embodiments, the number of the guard areas is a plurality, and the plurality of guard areas are arranged at intervals.

Through setting up a plurality of guard areas on the nonmetallic plate body at intervals, and different guard areas are used for carrying out pointed blocking to different explosion-proof valve spun high temperature fluid to can make the area of guard area little, further reduce nonmetallic plate body's quality, save material simultaneously, reduce nonmetallic plate body's cost.

In some embodiments, the non-metal plate body is further formed with a non-guard region adjacent to the guard region, and the guard region has a thickness greater than a thickness of the non-guard region.

Because mainly utilize the guard area to block explosion-proof valve spun high temperature fluid on the non-metal plate body, the non-guard area need not block high temperature fluid, through setting the thickness of guard area to be greater than the thickness of non-guard area, does benefit to the intensity that promotes the guard area, and then guarantees the protection effect of non-metal plate body, and the relative guard area attenuate setting of non-guard area does benefit to the weight that reduces the non-metal plate body simultaneously, impels the lightweight of battery.

In some embodiments, the width of the guard area is 30 mm-100 mm.

Through setting the width of guard area to 30mm ~100mm, can make guard area can catch explosion-proof valve spun most high temperature fluid, guarantee the quality of nonmetal plate body lighter simultaneously.

In some embodiments, the first structural layer is disposed protruding from the non-metallic plate body.

The first structural layer is arranged to protrude out of the nonmetal plate body, so that the overall strength of the nonmetal plate body is improved.

In some embodiments, the guard zone is disposed directly opposite the explosion proof valve.

The protection area is arranged opposite to the explosion-proof valve, so that the protection area can be better aligned to the explosion-proof valve, and high-temperature fluid sprayed by the explosion-proof valve is blocked.

In some embodiments, the battery box includes a box body having an opening, the battery cells are disposed within the box body, and the nonmetallic plate body is disposed on the box body and covers the opening.

The battery box is arranged to comprise a box body and a nonmetal plate body, wherein the box body is used for accommodating the battery unit, and the nonmetal plate body is used for covering the box body, so that the battery unit is sealed in the battery box; because the nonmetal plate body is used as the lid of battery box for the whole quality of battery box is lighter, and is loaded with the battery monomer at the battery box, even the battery monomer takes place thermal runaway, the battery box still keeps better leakproofness, reduces the risk that the battery fires.

In a second aspect, an embodiment of the present application provides an electric device, including an electric device body and a battery disposed on the electric device body, where the battery is a battery provided in the first aspect of the embodiment of the present application.

By adopting the battery, the power utilization device provided by the embodiment of the application has improved use safety.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the alternative embodiments. The drawings are only for purposes of illustrating alternative embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic view of an exploded structure of a battery provided in some embodiments of the present application;

FIG. 2 is a schematic cross-sectional view of a battery provided in some embodiments of the present application;

FIG. 3 is an enlarged schematic view of the portion A in FIG. 2;

fig. 4 is a schematic cross-sectional structural view of a protection area in a cover according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

1. A non-metal plate body; 11. a protection zone; 111. a first structural layer; 112. a thermal insulation layer; 113. a second structural layer; 12. a non-protected area;

2. a case; 21. A receiving chamber;

3. a battery cell; 31. an explosion-proof valve; 32. a cathode tab; 33. an anode tab;

10. a battery box;

100. and a battery.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

The battery is used as a power unit of the electric automobile, and is mainly integrated on the automobile body in the form of a battery pack or a battery module. The battery generally includes a battery case and a battery cell disposed within the battery case. In order to reduce the quality of the battery, the related art sets the cover of the battery case as a nonmetallic member. When the battery is extruded or the battery is in short circuit and the like, thermal runaway of the battery is easy to cause, and when the battery is in thermal runaway, the battery monomer can jet out high-temperature fluid, and the high-temperature fluid is easy to break through the cover body of the battery box, so that gas outside the battery can enter the battery box, the risk of ignition of the battery is increased, and the operation safety of the electric automobile is further influenced.

Based on this, this application designs a battery, and this battery includes battery monomer and battery box, and the battery monomer is acceptd in the battery box, is equipped with explosion-proof valve on the battery monomer, and the battery box includes the non-metal plate body, and the non-metal plate body is used for sheltering from the battery monomer, through setting up the non-metal plate body, can reduce the whole weight of battery. The protection area is arranged on the nonmetal plate body, and specifically, the protection area is arranged into a multilayer structure, the multilayer structure comprises a heat insulation layer and a first structural layer, the heat insulation layer is arranged on one side of the first structural layer, a battery unit is arranged on one side of the heat insulation layer, which is away from the first structural layer, of the explosion-proof valve, namely, the explosion-proof valve is also arranged on one side of the heat insulation layer, which is away from the first structural layer, the heat insulation layer is used for blocking heat transfer of high-temperature fluid sprayed out of the explosion-proof valve to the first structural layer, so that when the battery is in thermal runaway and the explosion-proof valve sprays high-temperature fluid, the high-temperature fluid reaches the heat insulation layer first, the heat transfer of the high-temperature fluid can be blocked to the first structural layer, the structural stability of the first structural layer is improved, the whole multilayer structure is prevented from being damaged, the sealing of the battery box is guaranteed, and the risk of battery fire is reduced.

The battery disclosed in some embodiments of the present application may be used in, but not limited to, an electric device such as a vehicle, a ship, or an aircraft, and a power supply system including the battery and the like disclosed in the present application that constitute the electric device may be used. The vehicle can be, but is not limited to, a new energy vehicle, which can be, but is not limited to, a pure electric vehicle, a hybrid electric vehicle, an extended range vehicle, or the like.

Referring to fig. 1 to 4, the embodiment of the application provides a battery 100, including a battery box 10 and a battery cell 3 having an explosion-proof valve 31, the battery cell 3 is accommodated in the battery box 10, the battery box 10 includes a non-metal plate body 1, a protection area 11 is formed on a part of the non-metal plate body 1, the protection area 11 is configured as a multi-layer structure, the multi-layer structure includes a first structural layer 111 and a heat insulation layer 112 disposed on one side of the first structural layer 111, and the explosion-proof valve 31 of the battery cell 3 is disposed on one side of the heat insulation layer 112 facing away from the first structural layer 111.

Here, the battery 100 may have various forms including, but not limited to, at least one of a battery pack and a battery module. The battery cell 3 refers to a basic unit for achieving the mutual conversion of chemical energy and electric energy, and is also a minimum unit constituting the battery 100. The battery cell mainly comprises an anode, a cathode, a diaphragm, electrolyte, a shell, an end cover, a tab and the like. Alternatively, the battery cell 3 is a secondary battery, where the secondary battery refers to a battery that can be continuously used by activating an active material by means of charging after the battery is discharged. Alternatively, the secondary battery includes, but is not limited to, a lithium ion battery.

The battery cell 3 has an explosion-proof valve 31, and the explosion-proof valve 31 refers to an explosion-proof valve mounted on the battery cell 3. The explosion-proof valve comprises an explosion-proof valve plate, and when the internal pressure of the battery monomer 3 is larger than the set pressure, the explosion-proof valve plate automatically breaks, so that the pressure release of the inside of the battery monomer 3 is realized, namely, the high-temperature fluid in the battery monomer 3 is sprayed out through the opened explosion-proof valve.

The battery box 10 refers to a container for loading the battery cells 3. The battery case 10 generally includes a case 2 having a receiving chamber 21 and a cover. The accommodating chamber 21 is for accommodating the battery cell 3, and a cover is provided on the case 2 such that the accommodating chamber 21 is formed as a closed space, so that the battery case 10 can protect the battery cell 3 accommodated therein. However, the temperature and pressure of the battery cell 3 inside the battery cell 3 may rise upon thermal runaway of the battery cell 3 in the battery case 10, and after a certain limit is reached, the substances inside the battery cell 3 may be ejected from any place of the battery cell 3 in the form of a high-temperature fluid. In order to cope with thermal runaway of the battery cell 3, specifically, the explosion-proof valve 31 is provided on the battery cell 3, and when the pressure inside the battery cell 3 reaches a certain pressure, the explosion-proof valve 31 is opened, so that the high-temperature fluid is ejected out of the battery cell 3 through the explosion-proof valve 31.

The battery cell 3 is disposed in the above-mentioned battery box 10, and optionally, the battery cell 3 is mounted in the receiving chamber 21 of the box 2, and the nonmetallic plate body 1 is covered on the box 2. Alternatively, the battery cell 3 is adhesively arranged with the bottom wall of the receiving chamber 21. Optionally, the explosion-proof valve 31 is located at the top of the battery cell 3, and the top of the explosion-proof valve 31 is disposed opposite to the nonmetallic plate body 1. The number of the battery cells 3 in the battery box 10 may be one or a plurality of. When the number of the battery cells 3 is plural, the plural battery cells 3 may be connected in series or in parallel or in series-parallel. The series-parallel connection means that the plurality of battery cells 3 are connected in series or in parallel.

The battery box 10 includes a non-metal plate body 1, that is, the non-metal plate body 1 is provided on the battery box 10, or the non-metal plate body 1 may be provided on the box body 2, or the non-metal plate body 1 may be provided on the cover body. Alternatively, the nonmetallic plate body 1 is formed as a cover body. The nonmetallic plate body 1 is a plate body made of nonmetallic materials of a main body structure, wherein nonmetallic materials include but are not limited to resin, ceramic and the like.

The shielding region 11 is formed in a part of the nonmetallic board body 1, that is, the shielding region 11 is a partial region on the nonmetallic board body 1, and only the partial region on the nonmetallic board body 1 is provided in a multilayer structure. When the guard area 11 is a partial area on the non-metal plate body 1, the number of guard areas 11 on the non-metal plate body 1 may be one or more.

The guard region 11 is provided in a multilayer structure, which herein refers to a structure including a plurality of structural layers that are stacked. Herein, multi-layer means at least two layers. By way of example, the multiple layers include, but are not limited to, three, four, five, or six layers.

Specifically, the multilayer structure includes a first structural layer 111 and a heat insulating layer 112, and the heat insulating layer 112 is disposed at one side of the first structural layer 111. The first structural layer 111 and the heat insulating layer 112 may be integrally formed together, or the first structural layer 111 and the heat insulating layer 112 may be detachably disposed together, for example, the heat insulating layer 112 is clamped on the first structural layer 111. The first structural layer 111 and the insulating layer 112 may be directly connected or indirectly connected. The protective area 11 is formed locally on the non-metal plate body 1, that is to say the multi-layer structure is formed locally on the non-metal plate body 1, which is also a non-metal structure. The multilayer structure comprises a first structural layer 111 and a heat insulating layer 112, wherein the first structural layer 111 is a non-metallic structural layer, and the heat insulating layer 112 is also a non-metallic structural layer.

The explosion-proof valve 31 of the battery cell 3 is disposed at a side of the heat insulating layer 112 away from the first structural layer 111, and the protection area 11 is used for blocking high-temperature fluid sprayed from the explosion-proof valve 31 by the battery cell 3 in the battery box 10, that is, the high-temperature fluid sprayed from the explosion-proof valve 31 by the battery cell 3 disposed in the battery box 10 is sprayed onto the protection area 11. The explosion-proof valve 31 is located on one side of the insulating layer 112, specifically on the side of the insulating layer 112 facing away from the first structural layer 111, where the explosion-proof valve 31 may or may not be located opposite the protection area 11. Optionally, the protection area 11 is disposed opposite to the explosion-proof valve 31 of the battery unit 3 in the battery case 10, that is, projected along the thickness direction of the protection area 11, the projection of the protection area 11 overlaps with the projection of the explosion-proof valve 31, and the outlet of the explosion-proof valve 31 is aligned with the protection area 11, so that when the explosion-proof valve 31 ejects the high-temperature fluid, the high-temperature fluid is directly ejected onto the protection area 11. Of course, in some embodiments, the protection area 11 is not opposite to the explosion-proof valve 31, but the high-temperature fluid sprayed by the explosion-proof valve 31 is sprayed onto the protection area 11, for example, the projection of the protection area 11 is overlapped with the projection of the explosion-proof valve 31 in the thickness direction of the protection area 11, but the explosion-proof valve 31 is obliquely arranged so that the outlet of the explosion-proof valve 31 is aligned with the protection area 11, and the high-temperature fluid can be sprayed onto the protection area 11.

The heat insulating layer 112 is mainly used for blocking heat of the high-temperature fluid from being transferred to the first structural layer 111, and it can be understood that the heat insulating layer 112 is closer to the battery cell 3 loaded in the battery box 10 than the first structural layer 111, so that when the high-temperature fluid is sprayed out of the explosion-proof valve 31 on the battery cell 3, the heat insulating layer 112 can block the high-temperature fluid from transferring heat to the first structural layer 111, and further, the structure of the first structural layer 111 is not damaged by the high-temperature fluid. In order to ensure that the heat insulating layer 112 can block the high-temperature fluid from transferring heat to the first structural layer 111, the heat insulating layer 112 has a smaller heat conductivity coefficient. Optionally, the thermal conductivity of the insulating layer 112 is less than the thermal conductivity of the metal layer. Optionally, the thermal conductivity of the insulating layer 112 is less than 5.00W/m.K.

The battery box 10 provided in the embodiment of the application includes the non-metal plate body 1, and by setting at least part of the battery box 10 to be the non-metal plate body 1, the overall weight of the battery box 10 can be reduced, and then the weight of the battery 100 can be reduced. The protection area 11 is arranged on the nonmetal plate body 1, the explosion-proof valve 31 of the battery unit 3 is arranged on one side of the protection area 11, and the protection area 11 is used for blocking high-temperature fluid sprayed by the explosion-proof valve 31 on the battery unit 3. Specifically, this protection zone 11 sets up to multilayer structure, this multilayer structure includes insulating layer 112 and first structural layer 111, insulating layer 112 sets up in one side of first structural layer 111, explosion-proof valve 31 sets up in one side that insulating layer 112 deviates from first structural layer 111, insulating layer 112 is used for the heat transfer of separation high temperature fluid for first structural layer 111, like this, when battery monomer 3 sprays high temperature fluid, high temperature fluid reaches insulating layer 112 earlier, the setting of insulating layer 112 can block high temperature fluid's heat transfer for first structural layer 111, thereby carry out thermal protection to first structural layer 111, prevent that multilayer structure from all being destroyed, and then guarantee the closure of battery case 10, reduce the risk of battery fire.

By using the multilayer structure provided in the partial region of the nonmetallic board 1 to block the high-temperature fluid ejected from the explosion-proof valve 31 in a targeted manner, the weight of the nonmetallic board 1 is prevented from increasing due to the entire nonmetallic board 1 being provided in a multilayer structure, and the battery 100 can be reduced in weight; meanwhile, only the partial region of the non-metal plate body 1 is provided in a multi-layered structure, which can save materials and reduce the cost of the battery 100.

Referring to fig. 4, in some embodiments of the present application, the multi-layer structure further includes a second structural layer 113, where the second structural layer 113 is located on a side of the heat insulation layer 112 facing away from the first structural layer 111.

The multi-layer structure further comprises a second structural layer 113, namely the multi-layer structure comprises a first structural layer 111, a second structural layer 113 and a heat insulation layer 112, wherein the heat insulation layer 112 is arranged on one side of the first structural layer 111, the second structural layer 113 is arranged on one side of the heat insulation layer 112 away from the first structural layer 111, namely the first structural layer 111 and the second structural layer 113 are respectively arranged on two sides of the heat insulation layer 112.

The multilayer structure is a non-metallic structure and the multilayer structure comprises a second structural layer 113, the second structural layer 113 also being a non-metallic structural layer.

Through increasing second structural layer 113 in multilayer structure, first structural layer 111 and second structural layer 113 set up respectively in the both sides of insulating layer 112, and insulating layer 112 is located multilayer structure's centre, utilizes first structural layer 111 and second structural layer 113 to carry out centre gripping and cladding to insulating layer 112 to realize fixing insulating layer 112, promote multilayer structure's stability and bonding strength.

Referring to fig. 4, in some embodiments of the present application, a thickness d1 of the first structural layer 111 is greater than a thickness d2 of the second structural layer 113.

The multi-layer structure further includes a second structural layer 113, and the first structural layer 111 and the second structural layer 113 are respectively disposed on two sides of the heat insulation layer 112, it can be understood that the second structural layer 113 is closer to the battery cell 3 in the battery box 10 than the first structural layer 111 and the heat insulation layer 112, so that when the explosion-proof valve 31 on the battery cell 3 ejects high-temperature fluid, the high-temperature fluid contacts the second structural layer 113 first, after the second structural layer 113 burns through, the high-temperature fluid reaches the heat insulation layer 112, and the heat insulation layer 112 blocks heat of the high-temperature fluid and the high-temperature fluid so as to prevent the first structural layer 111 from being damaged.

Here, the second structural layer 113 mainly plays a role of supporting and packaging the fixing insulation layer 112, and the second structural layer 113 is generally burned through as a sacrificial layer in the event of thermal runaway of the battery cell 3. The heat insulating layer 112 has good heat insulating properties and impact resistance at high temperatures, and can effectively thermally protect the first structural layer 111. The first structural layer 111 is a main bearing layer, and under the protection of the heat insulation layer 112, the structural strength of the battery cell 3 can be kept high in the thermal runaway process, so that the non-metal plate body 1 is ensured not to be damaged and fail in structure under the high-pressure condition, and further, the gas outside the battery box 10 is prevented from entering the battery box 10, and the battery 100 is prevented from firing.

Through being greater than the thickness of second structural layer 113 with the thickness of first structural layer 111, promote the structural strength of first structural layer 111 under the fixed prerequisite of assurance second structural layer 113 realization bearing and encapsulation to insulating layer 112, promote the pressure-bearing performance of nonmetallic plate body 1 at battery cell 3 thermal runaway's in-process structure, reduce the probability that battery 100 fires.

Referring to fig. 4, in some embodiments of the present application, the thickness d2 of the second structural layer 113 is 0.2mm to 0.5mm.

The second structural layer 113 mainly plays a role in supporting and packaging the fixed heat insulation layer 112, so that the thickness of the second structural layer 113 is increased, the strength of the second structural layer 113 is improved, and the supporting effect of the second structural layer 113 on the heat insulation layer 112 is further ensured. However, the second structural layer 113 may be burned out when the battery cell 3 is out of control, so that the thickness of the second structural layer 113 has little effect on improving the overall structural stability of the non-metal plate body 1, and the thickness of the second structural layer 113 is too large to increase the weight of the non-metal plate body 1 and increase the manufacturing cost of the non-metal plate body 1.

As an example, the thickness d2 of the second structural layer 113 includes, but is not limited to, any one point value or a range of values between any two points of 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, and 0.5mm.

By setting the thickness d2 of the second structural layer 113 to be 0.2 mm-0.5 mm, the weight of the non-metal plate body 1 is lighter while the second structural layer 113 has good bearing and packaging fixing effects on the heat insulation layer 112.

Referring to fig. 4, in some embodiments of the present application, the thickness d1 of the first structural layer 111 is 1mm to 2mm.

The first structural layer 111 serves as a bearing layer, and the thickness of the first structural layer 111 can be increased to improve the strength of the first structural layer 111, however, an excessive thickness of the first structural layer 111 can increase the weight of the non-metal plate body 1 and increase the manufacturing cost of the non-metal plate body 1.

As an example, the thickness d1 of the first structural layer 111 includes, but is not limited to, any one point value or a range value between any two point values of 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2mm.

Through setting the thickness of the first structural layer 111 to 1 mm-2 mm, the first structural layer 111 can maintain higher structural strength in the thermal runaway process of the battery cell 3 so that the non-metal plate body 1 can not be damaged and failed in the structure under the high-pressure condition, and meanwhile, the non-metal plate body 1 is lighter in weight.

Referring to fig. 4, in some embodiments of the present application, the thickness d3 of the thermal insulation layer 112 is 0.5mm to 2mm.

The heat insulation layer 112 is used for thermally protecting the first structural layer 111, and the thickness of the heat insulation layer 112 is increased to facilitate the heat insulation and impact resistance of the heat insulation layer 112 at high temperature, however, the thickness of the heat insulation layer 112 is too large to increase the weight and manufacturing cost of the non-metal plate body 1.

By way of example, the thickness d3 of the insulating layer 112 includes, but is not limited to, any point value or range of values between any two points of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2 mm.

By setting the thickness of the heat insulating layer 112 to 0.5 mm-2 mm, the weight of the non-metal plate body 1 is light while ensuring that the heat insulating layer 112 has good heat protection to the first structural layer 111.

In some embodiments of the present application, the insulation layer 112 is a foam structural layer.

A foam structural layer refers to a structural layer that contains a large number of voids. Optionally, the foam structure layer has a honeycomb or porous structure therein.

Because contain a large amount of clearances in the foam structure layer, can fill air in the clearance, the coefficient of heat conductivity of air is extremely low to make the thermal-insulated effect on foam structure layer promote, and then promote the thermal protection effect to first structural layer 111.

In some embodiments of the present application, the insulation layer 112 is a thermosetting resin layer.

The thermosetting resin layer refers to a structural layer containing a thermosetting resin. Thermosetting resins refer to high molecular polymer materials in which the molecular chains are chemically crosslinked together to form a rigid three-dimensional network structure, and the crosslinked structure cannot be repeatedly processed and formed during the polymerization process. The thermosetting resin includes, but is not limited to, at least one of polyurethane and silicone rubber.

By setting the heat insulating layer 112 as a thermosetting resin layer, the thermosetting resin has high heat resistance and is not easy to deform under pressure, so that the upper limit of the bearable temperature of the heat insulating layer 112 is improved, and the thermosetting resin is carbonized instead of melted under the action of high temperature, so that the heat insulating layer 112 can continuously block high-temperature fluid, and the structural stability of the first structural layer 111 is improved.

In some embodiments of the present application, the thermosetting resin layer has thermally insulating particles dispersed therein.

Adiabatic particles refer to particulate matter having a relatively low thermal conductivity. Optionally, the thermally insulating particles have a lower thermal conductivity than the metallic material. Optionally, the thermally insulating particles have a thermal conductivity of less than 1.00W/m.k.

By adding heat insulating particles into the thermosetting resin layer, the heat conduction insulating capability of the thermosetting resin layer is improved.

In some embodiments of the present application, the thermally insulating particles comprise at least one of expanded graphite particles, ceramic particles.

The expanded graphite particles refer to loose and porous vermiform substances obtained by intercalation, washing, drying and high-temperature puffing of natural graphite flakes. The expanded graphite particles have poor heat conducting property and are good heat insulating materials.

Ceramic particles are used as inorganic nonmetallic materials, have lower thermal conductivity than metallic materials, are good heat insulation materials, have high melting points, and have excellent chemical stability at high temperature.

By adding at least one of expanded graphite particles and ceramic particles into the thermosetting resin layer, the heat conduction isolation capability of the thermosetting resin layer can be effectively improved.

In some embodiments of the present application, the non-metal plate body 1 is a resin plate body, and the second structural layer 113 and/or the first structural layer 111 are/is a resin layer.

The resin plate body refers to a plate body prepared from resin. The resin layer refers to a structural layer prepared using a resin. Alternatively, the first structural layer 111 is a resin layer. Alternatively, the second structural layer 113 is a resin layer.

The resin refers to a polymer compound which can be used as a raw material for processing plastic products. The resin may be a thermoplastic resin or a thermosetting resin. Optionally, the resin includes, but is not limited to, at least one of polyurethane, epoxy.

By arranging the nonmetallic plate body 1 into a resin body, the overall weight of the nonmetallic plate body 1 is lighter, and meanwhile, the nonmetallic plate body 1 is more convenient to prepare and the material cost is low.

Referring to fig. 3, in some embodiments of the present application, the multi-layer structure is integrally formed.

The multi-layer structure is integrally formed, namely all layers in the multi-layer structure can be combined together through single processing, and more than two times of processing are not needed, namely one process is carried out in one step.

Optionally, each structural layer in the multilayer structure is a resin layer and is integrally formed and arranged through a hot pressing process, and optionally, the first structural layer 111, the heat insulation layer 112 and the second structural layer 113 are sequentially overlapped and then are hot pressed and compounded together; alternatively, the first structural layer 111 and the heat insulating layer 112 are stacked and then thermally pressed and compounded.

Optionally, each structural layer in the multilayer structure is a resin layer and is integrally formed by an injection molding process, optionally, the heat insulation layer 112 is placed in a mold, and then the first structural layer 111 and the second structural layer 113 are obtained by injection molding on both sides of the heat insulation layer 112.

Through setting up multilayer structure as integrated into one piece setting, promote the cohesiveness of each structural layer in the multilayer structure, do benefit to the intensity that strengthens multilayer structure, and then promote the life of nonmetal plate body 1.

Referring to fig. 1, in some embodiments of the present application, the number of guard areas 11 is plural, and the plural guard areas 11 are spaced apart.

The number of the protection areas 11 is multiple, and optionally, a plurality of battery cells 3 are arranged in the battery box 10, and different protection areas 11 are used for blocking high-temperature fluid sprayed by the explosion-proof valves 31 of different battery cells 3.

The different protection areas 11 are used to block the high temperature fluid ejected from the different explosion-proof valves 31, and do not mean that the high temperature fluid ejected from the different explosion-proof valves 31 is necessarily blocked by the different protection areas 11. The number of the guard areas 11 is generally set to be less than or equal to the number of the explosion proof valves 31. When the number of the protection areas 11 is equal to that of the explosion-proof valves 31, the protection areas 11 are arranged in one-to-one correspondence with the explosion-proof valves 31, and then the high-temperature fluid sprayed by different explosion-proof valves 31 is blocked by different protection areas 11. When the number of the protection zones 11 is smaller than the number of the explosion-proof valves 31, there may be a case where at least two explosion-proof valves 31 spray high-temperature fluid to the same protection zone 11.

As an example, four battery cells 3 are arranged in parallel in the battery box 10, and one explosion-proof valve 31 is arranged on each battery cell 3, and for distinguishing, the explosion-proof valves 31 on the four battery cells 3 are respectively defined as: battery explosion-proof valve a, battery explosion-proof valve b, battery explosion-proof valve c and battery explosion-proof valve d. Two protection areas 11 are arranged on the nonmetal plate body 1 at intervals, and are respectively defined as a protection area A and a protection area B for distinguishing. One protection zone 11 is opposite to the explosion-proof valves 31 of two battery monomers 3, namely, the protection zone A is opposite to the battery explosion-proof valve a and the battery explosion-proof valve B, and the other protection zone 11 is opposite to the explosion-proof valves 31 of the other two battery monomers 3, namely, the protection zone B is opposite to the battery explosion-proof valve c and the battery explosion-proof valve d. Here, the guard areas a and B are used to block the high temperature fluid ejected from the different explosion-proof valves 31, respectively, but the different explosion-proof valves 31 may eject the high temperature fluid to the same guard area 11.

Through setting up a plurality of guard areas 11 on nonmetallic plate body 1 at intervals, and different guard areas 11 are used for carrying out the targeted blocking to the high temperature fluid of different explosion-proof valve 31 blowout to can make the area of guard area 11 little, further reduce nonmetallic plate body 1's quality, save material simultaneously, reduce nonmetallic plate body 1's cost.

Referring to fig. 1, in some embodiments of the present application, a non-protection region 12 adjacent to the protection region 11 is further formed on the non-metal plate body 1, and the thickness of the protection region 11 is greater than that of the non-protection region 12.

When the guard region 11 is a partial region on the non-metal plate body 1, a non-guard region 12 is also formed on the non-metal plate body 1, and a region outside the guard region 11 on the non-metal plate body 1 is referred to as a non-guard region 12. In general, the high-temperature fluid sprayed from the explosion-proof valve 31 is sprayed only in the protected area 11, and the non-protected area 12 does not need to block the high-temperature fluid, so the non-protected area 12 does not need to be provided with the heat-insulating layer 112. The non-protective region 12 may be provided in a single layer structure or a double layer structure, and is not limited thereto.

The thickness of the protection area 11 is greater than that of the non-protection area 12, and it is understood that, on the non-metal plate body 1, the protection area 11 protrudes from the non-protection area 12, so that the protection area 11 is formed as a reinforcing rib on the non-metal plate body 1, and the strength of the non-metal plate body 1 is improved.

Because the non-metal plate body 1 is mainly used for blocking high-temperature fluid sprayed by the explosion-proof valve 31 by using the protection area 11, the non-protection area 12 does not need to block the high-temperature fluid, the thickness of the protection area 11 is set to be larger than that of the non-protection area 12, the strength of the protection area 11 is improved, the protection effect of the non-metal plate body 1 is further ensured, meanwhile, the non-protection area 12 is thinned relative to the protection area 11, the weight of the non-metal plate body 1 is reduced, and the battery 100 is light.

Referring to fig. 1 to 3, in some embodiments of the present application, the width of the protection area 11 is 30mm to 100mm.

The protection zone 11 is used to shield the explosion proof valve 31, i.e. the projection of the protection zone 11 covers the projection of the explosion proof valve 31 in a direction perpendicular to the protection zone 11. Optionally, the guard zone 11 is disposed directly opposite the explosion proof valve 31.

The width of the guard region 11 refers to the size of the guard region 11 in a designated direction, where the designated direction is the direction in which the cathode tab 32 points toward the anode tab 33 on the battery cell 3 in the battery case 10. The greater the width of the protection zone 11, the greater the amount of high-temperature fluid that the protection zone 11 can catch the explosion-proof valve 31, but an excessively large width of the protection zone 11 increases the weight and cost of the nonmetallic plate body 1.

Referring to fig. 3, the width of the guard region 11 is shown as W. Alternatively, W is 30mm to 100mm, and the width of the guard region 11 is any one point value or any two point values of 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, and 100mm, as an example.

The width of the protection area 11 is set to 30 mm-100 mm, so that the protection area 11 can be used for receiving most of high-temperature fluid sprayed by the explosion-proof valve 31, and meanwhile, the nonmetal plate body 1 is light in weight.

In some embodiments of the present application, the first structural layer 111 is provided protruding from the non-metallic plate body 1.

The first structural layer 111 protruding from the non-metal plate body 1 is disposed such that the top surface of the first structural layer 111 is higher than the top surface of the non-metal plate body 1 except for the protection region 11. The protection area 11 of the non-metal plate body 1 may be thicker than other areas, or the protection area 11 of the non-metal plate body 1 may be arranged to protrude to the side where the top surface is located.

By providing the first structural layer 111 to protrude from the nonmetallic board body 1, the overall strength of the nonmetallic board body 1 can be improved.

Referring to fig. 1 to 3, in some embodiments of the present application, the protection zone 11 is disposed opposite to the explosion-proof valve 31.

The arrangement of the protection zone 11 opposite to the explosion-proof valve 31 means that the projection along the thickness direction of the protection zone 11 is overlapped with the projection of the explosion-proof valve 31, and the outlet of the explosion-proof valve 31 is aligned with the protection zone 11.

By disposing the guard zone 11 directly opposite the explosion proof valve 31, the guard zone 11 can be better aligned with the explosion proof valve 31, thereby blocking the high temperature fluid ejected from the explosion proof valve 31.

Referring to fig. 1 to 4, in some embodiments of the present application, a battery box 10 includes a box 2 having an opening, a battery cell 3 is disposed in the box 2, and a non-metal plate 1 is disposed on the box 2 and covers the opening.

The battery box 10 refers to a container for loading the battery cells 3. The battery case 10 generally includes a case body 2 and a cover body. The nonmetallic plate body 1 is provided on the case 2 and covers the opening, and it is understood that the nonmetallic plate body 1 is formed as a cover of the battery case 10. The case 2 is formed with a receiving chamber 21, and the receiving chamber 21 is used for receiving the battery cell 3. The case 2 is also formed with an opening communicating with the accommodating chamber 21, through which the battery cell 3 can be placed into the accommodating chamber 21.

The non-metal plate body 1 is arranged on the box body 2, and can be that the non-metal plate body 1 is detachably arranged on the box body 2, for example, the non-metal plate body 1 and the box body 2 are detachably connected together through screws, or the non-metal plate body 1 is integrally arranged on the box body 2, for example, the non-metal plate body 1 is welded on the box body 2.

The non-metal plate body 1 covers the opening, i.e., the non-metal plate body 1 is disposed on the case body 2, so that the resulting battery case 10 is formed as a closed container.

By providing the battery case 10 to include the case 2 and the nonmetallic plate body 1, the case 2 is used to accommodate the battery cell 3, and the nonmetallic plate body 1 is used to cover the case 2 so that the battery cell 3 is sealed in the battery case 10; because the nonmetal plate body 1 is used as the cover body of the battery box 10, the whole mass of the battery box 10 is lighter, and the battery cell 3 is loaded on the battery box 10, even if the battery cell 3 is out of control, the battery box 10 still keeps better tightness, and the risk of the battery 100 firing is reduced.

In some embodiments of the present application, a battery box explosion-proof valve (not shown) is provided on the box 2.

The battery box explosion-proof valve refers to an explosion-proof valve provided on the battery box 10. The explosion-proof valve comprises an explosion-proof valve block, and when the pressure born by the explosion-proof valve block is greater than the set pressure, the explosion-proof valve block automatically breaks, so that pressure relief is realized.

In general, the battery cells 3 in the battery box 10 will discharge high-temperature fluids outwards during thermal runaway, and these high-temperature fluids are mainly gas, liquid and solid particle mixtures formed by the electrolytes, pole pieces and the like in the battery cells 3 under the action of high temperature. When the battery cell 3 is loaded in the battery case 10, the battery cell 3 discharges a high-temperature fluid into the inside of the battery case 10, i.e., the accommodating chamber 21 of the case 2, upon thermal runaway, and the high-temperature fluid increases the pressure of the accommodating chamber 21, i.e., the internal pressure of the battery case 10.

Through set up battery box explosion-proof valve on box 2, battery box explosion-proof valve is used for carrying out the pressure release to the inside of battery box 10 when the internal pressure of battery box 10 risees to the settlement pressure to guarantee the security of battery box 10, simultaneously, set up battery box explosion-proof valve on box 2, when the internal pressure of battery box 10 risees, the pressure of battery box 10 can be preferentially released through battery box explosion-proof valve, thereby can realize directional pressure release, the risk of pressure release to arbitrary direction when reducing the internal pressure of battery box 10 and rising. For example, the battery box 10 is used for installing on the automobile body, and the battery monomer 3 is used for holding in the battery box 10, through setting up the battery box explosion-proof valve on the side that deviates from the automobile body on the box 2 for when the internal pressure of battery box 10 risees, the pressure of battery box 10 can be through the battery box explosion-proof valve to deviating from the one side of automobile body and release, avoids causing the influence to the automobile body.

Referring to fig. 1 to 4, in some embodiments of the present application, a battery 100 includes a battery case 10 and a plurality of battery cells 3 disposed in the battery case 10, and an explosion-proof valve 31 is disposed on each battery cell 3. The battery box 10 comprises a non-metal plate body 1, wherein a plurality of protection areas 11 are formed on part of the non-metal plate body 1, and the protection areas 11 are arranged at intervals. The non-metal plate body 1 is also formed with a non-protection area 12, and the non-protection area 12 is arranged around the protection area 11. The protection region 11 is provided in a multi-layered structure for blocking high-temperature fluid ejected from the explosion-proof valve 31 of the battery cell 3 in the battery case 10. Specifically, each of the guard areas 11 is for covering the explosion-proof valves 31 of the plurality of battery cells 3 provided in the battery case 10, respectively. The multi-layer structure comprises a first structural layer 111, a heat insulating layer 112 and a second structural layer 113 which are sequentially overlapped, wherein the thickness of the first structural layer 111 is larger than that of the second structural layer 113. The first structural layer 111 is a resin layer, and the second structural layer 113 is also a resin layer. The heat insulating layer 112 is a thermosetting resin layer of a foamed structure, and the thermosetting resin layer is dispersed with expanded graphite particles and ceramic particles. The first structural layer 111, the heat insulating layer 112 and the second structural layer 113 in the multilayer structure are integrally formed, and the multilayer structure is also integrally formed on the nonmetallic board body 1.

The embodiment of the application also provides an electric device, which comprises an electric device body and the battery 100 arranged on the electric device body.

The electrical device may include, but is not limited to, a vehicle, a ship, an aircraft, or the like. Alternatively, the battery 100 may serve as a power supply system of the power utilization device. Alternatively, the vehicle may include, but is not limited to, a new energy vehicle, which may be, but is not limited to, a pure electric vehicle, a hybrid vehicle, an extended range vehicle, or the like.

By adopting the battery 100, the power utilization device provided by the embodiment of the application has improved use safety.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (17)

1. A battery, characterized in that: including battery box and have explosion-proof valve's battery monomer, the battery monomer holds in the battery box, the battery box includes the nonmetal plate body, the part of nonmetal plate body is formed with the guard area, the guard area sets up to multilayer structure, multilayer structure includes first structural layer and sets up the insulating layer of one side of first structural layer, the explosion-proof valve of battery monomer sets up the insulating layer deviates from one side of first structural layer.

2. The battery according to claim 1, wherein: the multilayer structure further comprises a second structural layer located on a side of the insulating layer facing away from the first structural layer.

3. The battery according to claim 2, wherein: the thickness of the first structural layer is greater than the thickness of the second structural layer.

4. The battery according to claim 2, wherein: the thickness of the second structural layer is 0.2 mm-0.5 mm; and/or the thickness of the first structural layer is 1 mm-2 mm; and/or the thickness of the heat insulation layer is 0.5 mm-2 mm.

5. The battery according to any one of claims 1 to 4, wherein: the heat insulation layer is a foam structure layer.

6. The battery according to any one of claims 1 to 4, wherein: the heat insulating layer is a thermosetting resin layer.

7. The battery according to claim 6, wherein: the thermosetting resin layer has heat insulating particles dispersed therein.

8. The battery according to claim 7, wherein: the heat insulating particles include at least one of expanded graphite particles and ceramic particles.

9. The battery according to any one of claims 2 to 4, wherein: the nonmetal plate body is a resin plate body, and the second structural layer and/or the first structural layer is a resin layer.

10. The battery according to claim 9, wherein: the multilayer structure is integrally formed.

11. The battery according to any one of claims 1 to 4, wherein: the number of the protection areas is multiple, and the protection areas are arranged at intervals.

12. The battery according to any one of claims 1 to 4, wherein: the non-metal plate body is also provided with a non-protection area adjacent to the protection area, and the thickness of the protection area is larger than that of the non-protection area.

13. The battery according to any one of claims 1 to 4, wherein: the width of the protection area is 30 mm-100 mm.

14. The battery according to any one of claims 1 to 4, wherein: the first structural layer protrudes out of the nonmetal plate body.

15. The battery according to any one of claims 1 to 4, wherein: the protection area is arranged opposite to the explosion-proof valve.

16. The battery according to any one of claims 1 to 4, wherein: the battery box comprises a box body with an opening, the battery unit is arranged in the box body, and the nonmetal plate body is arranged on the box body and covers the opening.

17. An electrical device, characterized in that: comprising an electrical device body and a battery according to any one of claims 1 to 16 arranged on the electrical device body.