CN219811573U

CN219811573U - Battery and electricity utilization device

Info

Publication number: CN219811573U
Application number: CN202320202846.8U
Authority: CN
Inventors: 陈新祥; 林蹬华; 郑于炼; 黄守君; 王鹏
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-10-10
Anticipated expiration: 2033-02-10

Abstract

The application is applicable to the technical field of battery thermal management, and provides a battery and an electric device. The second battery cell is opposite to the first wall. At least part of the heat insulation structure is arranged between the first wall and the second battery unit, and the front projection of at least part of the heat insulation structure on the first wall covers the pressure release mechanism. By the arrangement, the problem that the heat of the first battery monomer is spread to the second battery monomer can be solved, and the problem that the chain reaction of the heat runaway of the second battery monomer is further solved, so that a plurality of battery monomers explode is solved.

Description

Battery and electricity utilization device

Technical Field

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

Background

In some cases, the high-temperature and high-pressure gas and the accompanying flame discharged when the battery cells are out of control thermally can be rapidly diffused, and then easily spread to the adjacent battery cells, so that the adjacent battery cells undergo a chain reaction.

Disclosure of Invention

In view of the above problems, embodiments of the present utility model provide a battery and an electric device, which can solve the problem that adjacent battery cells undergo a chain reaction when the battery cells undergo thermal runaway.

In a first aspect, an embodiment of the present utility model provides a battery, including:

the first battery unit comprises a first shell and a pressure relief mechanism, wherein the first shell is provided with a first wall, and the pressure relief mechanism is arranged on the first wall;

a second battery cell opposite the first wall;

the heat insulation structure is at least partially arranged between the first wall and the second battery unit, and the orthographic projection of the heat insulation structure on the first wall covers the pressure release mechanism.

According to the battery provided by the embodiment of the utility model, the heat insulation structure is arranged between the first wall of the first battery monomer and the second battery monomer, and the front projection of the heat insulation structure on the first wall covers the pressure release mechanism, so that at least part of the heat insulation structure separates the pressure release mechanism of the first battery monomer from the second battery monomer. Like this, when first battery monomer takes place thermal runaway, can directly spout to heat insulation structure when the high temperature high pressure medium that first battery monomer produced is spouted through relief mechanism, and heat insulation structure's heat-proof effect can slow down this high temperature high pressure medium's heat spread speed, and then can reduce this high temperature high pressure medium to the free influence of second battery greatly. Therefore, the problem that the battery cell body with thermal runaway is thermally spread to the adjacent battery cell body can be improved, and the problem that the adjacent battery cell body has a chain reaction with thermal runaway is further improved.

In some embodiments, an exhaust passage is provided between the first wall and the insulating structure, and the pressure relief mechanism is exposed within the exhaust passage.

By arranging the exhaust channel, the high-temperature high-pressure medium generated by the first battery unit can be well released through the exhaust channel, and then the problem of aggregation of the high-temperature high-pressure medium can be solved.

In some embodiments, the second battery cell includes a second housing having a second wall opposite the first wall, at least a portion of the insulating structure being disposed on the second wall.

Through setting up at least part in the free second wall of second battery with thermal-insulated structure, can make thermal-insulated structure realize the guard action to the free second battery for thermal-insulated structure's setting position is very simple.

In some embodiments, the second wall is recessed away from the first wall to form a groove, an orthographic projection of the groove on the first wall covers the pressure relief mechanism, and at least a portion of the insulating structure is disposed at a wall of the groove.

Through adopting above-mentioned technical scheme, can reduce the size of the part that thermal-insulated structure stretches out outside the recess, and then improve because of thermal-insulated structure stretches out outside the recess and cause the problem that has great clearance between first battery monomer and the second battery monomer to be convenient for improve the compact structure between first battery monomer and the second battery monomer. And, the formation of the exhaust passage is also facilitated.

In some embodiments, the groove is disposed opposite the first wall recess in a first direction, and the first direction is perpendicular to the first wall; the groove is provided with a first groove wall and a second groove wall which is connected with the first groove wall in a bending way, and the first groove wall is arranged at the bottom of the groove; the heat insulation structure comprises a first heat insulation piece arranged on the first groove wall, and at least part of the pressure release mechanism is covered by the orthographic projection of the first heat insulation piece on the first wall.

Through adopting above-mentioned technical scheme, set up first thermal-insulated piece in the tank bottom of recess, can make first thermal-insulated piece just to the free relief mechanism of first battery, like this, first thermal-insulated piece can form the contained angle that is close 90 with the blowout direction from the free high temperature high pressure medium of first battery as far as possible to can block from the free high temperature high pressure medium of first battery effectively, and then can improve the free influence of the free thermal runaway of first battery of second battery and cause the problem of chain reaction to take place.

In some embodiments, the front projection of the first insulation on the first wall completely covers the pressure relief mechanism.

Through adopting above-mentioned technical scheme, when thermal runaway takes place for first battery monomer, the produced high temperature high pressure medium of first battery monomer can spout to first insulating part basically, and this first insulating part can be isolated the high temperature high pressure medium outside the second battery monomer basically, so can realize the protection with the battery monomer that takes place adjacent of thermal runaway battery monomer better.

In some embodiments, the depth of the groove is greater than the size of the first thermal shield in the first direction such that the first wall is spaced from the first thermal shield to form the vent passage.

By adopting the technical scheme, the first battery monomer and the second battery monomer have higher structural compactness. In addition, the exhaust channel is formed between the first battery cell and the second battery cell, so that the problem that the battery cell explodes due to the aggregation of high-temperature and high-pressure media can be relieved.

In some embodiments, the insulation structure further comprises a second insulation member disposed on the second channel wall.

Through adopting above-mentioned technical scheme, the setting of first thermal-insulated piece and second thermal-insulated piece makes thermal-insulated structure can block the high temperature high pressure medium that is located the recess perfectly, so can slow down the speed that high temperature high pressure medium spread, can improve the problem that the first battery monomer heat spread to the second battery monomer.

In some embodiments, an end of the second insulation member facing away from the first groove wall in the first direction is flush with the second wall; alternatively, an end of the second insulating member facing away from the first groove wall along the first direction is spaced apart from the second side wall along the first direction.

Through adopting above-mentioned technical scheme, can be with the second thermal-insulated spare along the first direction one end and the second wall that the first cell wall was carried away from flush, can improve the first single battery high temperature high pressure medium and pass to the single problem of second battery from the single battery between the single battery of first battery and the single battery of second, still can improve the single battery between the single battery of first battery and the single battery of second. One end of the second heat insulation piece, which is opposite to the first groove wall along the first direction, extends out of the second wall along the first direction, so that the problem that a high-temperature high-pressure medium of the first battery monomer is transferred to the second battery monomer from a gap between the first battery monomer and the second battery monomer is solved. One end of the second heat insulating piece, which is opposite to the first groove wall along the first direction, is lower than the second wall along the first direction, so that the structural compactness between the first battery cell and the second battery cell is improved.

In some embodiments, the second insulation is coupled to the first insulation.

By adopting the technical scheme, no gap exists between the first heat insulating piece and the second heat insulating piece, so that the problem that a high-temperature high-pressure medium thermally spreads to the second battery cell through the gap between the first heat insulating piece and the second heat insulating piece can be solved.

In some embodiments, the groove is recessed along a first direction and disposed at an end of the second housing along a second direction, the second direction intersecting the first direction.

By adopting the technical scheme, the release of the high-temperature high-pressure medium is convenient, and the cooling effect can be effectively realized, so that the problem that the second battery monomer generates chain reaction is solved.

In some embodiments, the groove also extends through one or both ends of the second housing in a third direction that intersects the first and second directions, respectively.

Through adopting above-mentioned technical scheme, when the first battery monomer takes place in the thermal runaway the first free recess of second battery of produced high temperature high pressure medium, can follow the recess and follow the one end or both ends release to external environment of third direction, can also follow the recess and follow the one end release to external environment of second direction, the release of the high temperature high pressure medium of being convenient for can effectively realize the cooling effect to improve the problem that the second battery monomer takes place the chain reaction.

In some embodiments, the end of the second housing in the second direction and/or the end of the second housing in the third direction has a predetermined end face, the recess extends to the predetermined end face, and at least part of the insulation structure is disposed on the predetermined end face.

Through adopting above-mentioned technical scheme, when first battery monomer takes place thermal runaway, the free recess of second battery is got into to produced high temperature high pressure medium, and when releasing, is located the thermal-insulated structure of predetermineeing the terminal surface can improve high temperature high pressure medium heat and spread to predetermineeing the terminal surface, and then the heat spreads to the free problem of second battery.

In some embodiments, the second housing has a flange, and a portion of the insulating structure at the predetermined end surface abuts against the flange.

Through adopting above-mentioned technical scheme, on the one hand help the location of thermal-insulated structure, simplified thermal-insulated structure and the free assembly process of second battery, on the other hand need not to make thermal-insulated structure stride over the turn-ups, so help improving the problem that the welding effect of the turn-ups department that thermal-insulated structure caused became invalid.

In some embodiments, a ratio of a dimension of a portion of the insulating structure at the wall of the recess to a dimension of the recess is greater than 0.9 in a predetermined direction, the predetermined direction intersecting the first direction.

By adopting the technical scheme, at least part of the heat insulation structure can be approximately paved with the walls of the grooves, so that the protection of the second battery monomer can be effectively realized, and the heat spreading of the high-temperature high-pressure medium to the walls of the grooves can be restrained, so that the second battery monomer is influenced.

In some embodiments, the first wall is further provided with electrode terminals spaced apart from the pressure relief mechanism, and an orthographic projection of the groove on the first wall covers the electrode terminals.

Through adopting above-mentioned technical scheme to make the free recess of second battery can be used to dodge the free electrode terminal of first battery, so can reduce the free clearance of first battery and second battery, so can make between first battery and the second battery have higher compactibility.

In some embodiments, the insulating structure is bonded to the second cell.

By adopting the technical scheme, the process for arranging the heat insulation structure on the second battery monomer is very simple and convenient.

In some embodiments, the insulating structure is disposed on the first wall.

Through adopting above-mentioned technical scheme for thermal-insulated structure sets up in first battery monomer, in order to slow down the high temperature high pressure medium out diffusion's that first battery monomer produced speed, and then can realize the protection to adjacent battery monomer.

In some embodiments, the first cell and the second cell are arranged along a first direction, the second cell having a second wall opposite the first wall, the first wall and the second wall being perpendicular to the first direction.

By adopting the technical scheme, the first wall and the second wall can be mutually propped against each other, so that the structural compactness between the first battery monomer and the second battery monomer is improved.

In some embodiments, the area of the first wall is greater than the area of the other walls of the first housing.

Through adopting above-mentioned technical scheme for relief mechanism sets up on the biggest wall of area of first shell, so makes the operation that forms relief mechanism on first shell very convenient, simple.

In some embodiments, the thermal conductivity of the insulating structure is less than or equal to 0.7W/mK; and/or the melting point of the heat insulation structure is greater than 800 ℃.

Through adopting above-mentioned technical scheme for thermal-insulated structure sets up to the structure that thermal conductivity is less and/or the fusing point is higher, helps realizing thermal-insulated structure's better thermal-insulated effect, in order to realize the protection to the second battery monomer.

In some embodiments, the insulating structure is a mica structure, a ceramic structure, a glass fiber structure, a carbon-carbon composite piece, or a pre-oxidized silk aerogel piece.

Through adopting above-mentioned technical scheme to make thermal-insulated structure set up to the high temperature resistant structure that coefficient of heat conductivity is lower, the fusing point is higher, help realizing thermal-insulated structure's better thermal-insulated effect, in order to realize the protection to the second battery monomer.

In a second aspect, an embodiment of the present application provides an electrical device including a battery.

The power utilization device provided by the embodiment of the application has the advantages that the problem that the first battery monomer thermally spreads to the second battery monomer can be improved due to the adoption of the battery, and the problem of chain reaction of thermal runaway of adjacent battery monomers can be improved, so that the problem of explosion of a plurality of battery monomers can be improved to a certain extent.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle provided in some embodiments of the application;

FIG. 2 is an exploded view of a battery provided in some embodiments of the application;

fig. 3 is a schematic view of a battery cell according to some embodiments of the present application;

FIG. 4 is a schematic view of a portion of a battery provided in some embodiments of the application;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is an enlarged view of a portion of FIG. 5;

FIG. 7 is a partial cross-sectional view of a battery provided in accordance with other embodiments of the present application;

FIG. 8 is a schematic view of the insulation structure of FIG. 6 removed;

FIG. 9 is a partial cross-sectional view of a battery provided in accordance with still other embodiments of the present application;

FIG. 10 is an enlarged view at B in FIG. 4;

FIG. 11 is a schematic illustration of a second cell and a thermal insulation structure of a battery according to some embodiments of the present application;

FIG. 12 is an enlarged view at C in FIG. 11;

fig. 13 is a partial cross-sectional view of a second cell of a battery provided in accordance with further embodiments of the present application;

FIG. 14 is an exploded view of a second cell and a thermal insulation structure of a battery according to further embodiments of the present application;

fig. 15 is an enlarged view of D in fig. 14;

fig. 16 is a side view of a second battery cell of a battery provided in some embodiments of the application;

fig. 17 is an enlarged view at E in fig. 16;

Fig. 18 is a top view of a second battery cell of a battery provided in some embodiments of the application;

FIG. 19 is an enlarged view of a portion of FIG. 18;

fig. 20 is a partial cross-sectional view of a battery provided in accordance with still other embodiments of the present application.

Wherein, each reference sign in the figure:

1000-vehicle; 100-cell; 200-a controller; 300-motor; 10-battery cell; 10 a-a first cell; 10 b-a second cell; 101-a first wall; 102-a second wall; 103-grooves; 104-a first groove wall; 105-a second groove wall; 106-presetting an end face; 1061—a first end face; 1062-a second end face; 11-a housing; 11 a-a first housing; 11 b-a second housing; 111-a housing; 112-end caps; 113-flanging; 1131-a first flange; 1132-a second flange; 12-a pressure release mechanism; 13-electrode terminals; 20-a box body; 21-a first part; 22-a second part; 30-an insulating structure; 31-a first insulation; 32-a second insulation; 33-a third insulation; 34-fourth insulation; 40-an exhaust passage; 50-an adhesive layer; 60-confluence part; z-a first direction; y-a second direction; x-third direction; l1-the dimension of the first insulation in the first direction; l2-depth of groove in first direction; the dimension of the L3-insulation structure along the third direction; l4-dimension of the groove in the third direction.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.

In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the description of the present application, the meaning of "plurality" is two or more, and "two or more" includes two unless specifically defined otherwise. Accordingly, "multiple sets" means more than two sets, including two sets.

In the description of the present application, unless explicitly stated 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 integrated; can 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 present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present application, the term "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: there are three cases, a, B, a and B simultaneously. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the field of batteries, battery cells are often provided with a pressure relief mechanism. When the battery cell is out of control, the high-temperature and high-pressure gas generated by the battery cell can break through the pressure release mechanism to be released outside the battery cell.

In some cases, for a thin-sheet battery having a small thickness, in order to facilitate the process of disposing the pressure release mechanism, the pressure release mechanism is disposed on a large face of the battery cell, that is, on a side face of the battery cell in the thickness direction. For such thin-plate batteries with smaller thickness, when the number of the battery cells is plural, at least part of the battery cells are usually arranged in sequence along the thickness direction of the battery cells, and then the pressure release mechanism of the battery cell is inevitably opposite to the adjacent battery cell.

Therefore, when the battery monomer is in thermal runaway, high-temperature and high-pressure gas discharged by the battery monomer in thermal runaway can be directly sprayed to the adjacent battery monomer through the pressure release mechanism so as to be rapidly diffused to the adjacent battery monomer. In other words, the battery cell having thermal runaway generates heat spreading and spreads to the adjacent battery cell, so that the adjacent battery cell generates a chain reaction of thermal runaway. As such, the adjacent battery cells are affected by the battery cells that are thermally out-of-control, and there is a risk of damage at high temperature, even occurrence of thermal out-of-control, explosion, and the like.

In view of the foregoing, a first aspect of embodiments of the present application provides a battery, where a heat insulation structure is disposed between a first wall of a first battery cell and a second battery cell, and an orthographic projection of the heat insulation structure on the first wall covers a pressure release mechanism, so that at least a portion of the heat insulation structure separates the pressure release mechanism of the first battery cell from the second battery cell. Therefore, when the first battery monomer is in thermal runaway, high-temperature high-pressure gas generated by the first battery monomer is sprayed to the heat insulation structure through the pressure release mechanism, the heat insulation effect of the heat insulation structure can slow down the heat spreading speed of the high-temperature high-pressure gas, so that the influence of the high-temperature high-pressure gas on the second battery monomer can be greatly reduced, the problem that the battery monomer in thermal runaway is spread to the adjacent battery monomer can be improved, and the problem of the chain reaction of the adjacent battery monomer in thermal runaway can be further improved.

In some embodiments of the present application, the battery disclosed in the embodiments of the present application may be used for an electric device using the battery as a power source.

The battery referred to by embodiments of the present application may be a single physical module that includes one or more battery cells to provide higher voltage and capacity. When a plurality of battery cells are arranged, the plurality of battery cells are connected in series, in parallel or in series-parallel through the converging component, and the series-parallel refers to that the plurality of battery cells are connected in series or in parallel.

In some embodiments, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module. Illustratively, the battery further includes a securing assembly comprised of end plates, side plates, and the like. The plurality of battery cells can be connected in series, in parallel or in series-parallel to form a whole, and then the whole is fixed by arranging components such as end plates, side plates and the like on the outer side of the whole, so that the battery cells form a battery module.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being housed in the case.

In some embodiments, when the battery is applied to a vehicle, the housing of the battery may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the chassis of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side members of the vehicle.

In some embodiments of the application, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like.

For convenience of description, the embodiment of the application is illustrated by taking an electric device as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic diagram of a vehicle 1000 according to some embodiments of the application. The battery 100 is provided in the vehicle 1000, and the battery 100 may be provided at the bottom or at the head or at the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, such as for operating power requirements during start-up, navigation, and travel of the vehicle 1000. In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 illustrates an exploded view of a battery 100 provided in some embodiments of the application. The battery 100 includes a case 20 and a plurality of the battery cells 10, the case 20 has a structure having an accommodating space therein, and the case 20 may have various structures. Specifically, the case 20 includes a first portion 21 and a second portion 22, and the first portion 21 and the second portion 22 are mutually covered and define the above-mentioned accommodation space together. The first portion 21 may be a hollow structure having an opening at one end, the second portion 22 may be a plate-shaped structure, and the second portion 22 covers the opening side of the first portion 21, so that the first portion 21 and the second portion 22 together define the accommodating space. Alternatively, each of the first portion 21 and the second portion 22 may be a hollow structure having an opening at one end, as shown in fig. 2, the opening side of the first portion 21 is covered with the opening side of the second portion 22, so that the first portion 21 and the second portion 22 together define the accommodating space. In addition, the case 20 composed of the first portion 21 and the second portion 22 may be of various shapes such as a cylinder, a rectangular parallelepiped, etc.

In some implementations, the plurality of battery cells 10 may be formed into one body by series connection, parallel connection or series-parallel connection, and then the body formed by the plurality of battery cells 10 is directly received in the receiving space formed by the case 20, as shown in fig. 2. In other implementations, the plurality of battery cells 10 may be connected in series, parallel or series-parallel to form a plurality of modules, and each module is fixed by a corresponding fixing component to form the above battery module, that is, the plurality of battery cells 10 form a plurality of battery modules, and the plurality of battery modules are connected in series, parallel or series-parallel to form a whole and are accommodated in the accommodating space defined by the case 20. Based on this, the battery cell 10 is made to form a battery pack by the above two implementations.

The battery cell 10 refers to the smallest unit that stores and outputs electric power. The battery cell 10 may be a secondary battery or a primary battery. The battery cell 10 may be a metal battery, a lithium-sulfur battery, a sodium ion battery, or a magnesium ion battery, but is not limited thereto. The battery cell 10 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 is a schematic diagram of a battery cell 10 according to some embodiments of the application. The battery cell 10 includes a case 11 and an electrode assembly (not shown in the drawings).

The electrode assembly is a component in which electrochemical reactions occur in the battery cell 10. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a diaphragm is arranged between the positive electrode plate and the negative electrode plate. The positive pole piece and the negative pole piece are provided with active substances, the parts of the positive pole piece and the negative pole piece, which are not provided with active substances, form main body parts of the electrode assembly, the parts of the positive pole piece and the negative pole piece, which are not provided with active substances, form electrode lugs respectively, the electrode lugs of the positive pole piece are positive electrode lugs, the electrode lugs of the negative pole piece are negative electrode lugs, and the positive electrode lugs and the negative electrode lugs can be jointly positioned at one end of the main body parts or respectively positioned at two ends of the main body parts. The electrode lug is a current transmission end of the electrode assembly and is used for transmitting current.

In the battery cell 10, the number of electrode assemblies may be one or more.

In some instances, the electrode assembly may also be referred to as a cell, bare cell, wound body, laminate, or the like.

In some embodiments, the battery cell 10 further includes an electrolyte that serves to conduct ions between the positive and negative electrode sheets. The application is not particularly limited in the kind of electrolyte, and may be selected according to the need. The electrolyte may be liquid, gel or solid.

The case 11 includes a case 111 and an end cap 112, the case 111 and the end cap 112 being members for defining together the internal environment of the battery cell 10, the internal environment defined by the case 111 and the end cap 112 for accommodating the electrode assembly and the electrolyte.

In some implementations, the housing 111 and the end cap 112 may be separate components, specifically, the housing 111 has an opening, and the end cap 112 covers the opening of the housing 111 to define the internal environment of the battery cell 10 together with the housing 111 and isolate the internal environment of the battery cell 10 from the external environment. For example, as shown in fig. 3, for a thin-sheet battery, after the end cap 112 is covered on the opening of the case 111, the peripheral edge of the end cap 112 and the peripheral edge of the opening of the case 111 are fixed by welding.

In other implementations, the case 111 and the end cap 112 may be integrally formed, and specifically, a common connection surface may be formed between the end cap 112 and the case 111 before the electrode assembly is put into the case, and when the electrode assembly needs to be packaged after the electrode assembly is put into the case, the end cap 112 is then covered with the case 111. For example, when the battery cell 10 is a soft-pack battery, the aluminum-plastic film may be punched to form the housing 111 and the end cover 112 of the battery cell 10, and then the electrode assembly is put into the internal environment formed by punching the aluminum-plastic film, and then the opening of the aluminum-plastic film is fixed by sealing edges such as side sealing and top sealing. Of course, the battery cell 10 may not be limited to a soft pack battery, and the materials of the case 111 and the end cap 112 are not limited to an aluminum plastic film.

It should be added here that the number of end caps 112 may be one. Of course, the number of the end caps 112 may be two, and two end caps 112 are respectively disposed at both ends of the housing 11.

In both of the above implementations, the case 11 may be in the shape of a cylindrical case, a square case, or the like, and may be specifically determined according to the specific shape and size of the electrode assembly. Moreover, the materials of the housing 111 and the end cap 112 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

Here, although the battery 100 according to the embodiment of the present application is improved based on the technical problem of the thin-sheet battery having a small thickness, the type of the battery cell 10 in the battery 100 is not limited to the thin-sheet battery. That is, the battery cell 10 according to the embodiment of the present application may be a cylindrical battery, a prismatic battery, a pouch battery, or other shaped battery cell 10, and the prismatic battery may include a square-case battery, a blade-shaped battery, a polygonal-prismatic battery, or the like.

Referring to fig. 4 to 6, fig. 4 is a partial schematic view of a battery according to some embodiments of the present application, fig. 5 is a cross-sectional view of fig. 4, and fig. 6 is a partial enlarged view of fig. 5. Some embodiments of the present application provide a battery 100 including a first battery cell 10a, a second battery cell 10b, and a thermal insulation structure 30. The first battery cell 10a includes a first housing 11a and a pressure release mechanism 12, the first housing 11a is provided with a first wall 101, and the pressure release mechanism 12 is provided on the first wall 101. The second battery cell 10b is disposed opposite the first wall 101. At least part of the insulating structure 30 is disposed between the first wall 101 and the second battery cell 10b, and the front projection of the insulating structure 30 on the first wall 101 covers the pressure release mechanism 12.

As can be appreciated, among the plurality of battery cells 10 of the battery 100, the two battery cells 10 opposite to each other are a first battery cell 10a and a second battery cell 10b, respectively. The first battery cell 10a and the second battery cell 10b each include a housing 11, and the housing 11 of the first battery cell 10a is the first housing 11a.

The first case 11a is a member for defining an internal environment of the first battery cell 10a, and the internal environment defined by the first case 11a is for accommodating an electrode assembly, an electrolyte, and the like of the first battery cell 10 a.

The first wall 101 is a solid wall of the first housing 11a. In some embodiments, as shown in fig. 3, the first wall 101 may be provided to an end cap 112 of the first housing 11a. In other embodiments, the first wall 101 may also be provided on the housing 111 of the first housing 11a.

The pressure release mechanism 12 is a pressure release mechanism 12 that can release the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value. For example, when the battery cell 10 is operating normally, the gas pressure inside the battery cell 10 is smaller than the opening pressure value of the pressure release mechanism 12, the pressure release mechanism 12 is in a closed state, and the gas inside the battery cell 10 and the gas outside are not communicated with each other. When the battery cell 10 is subjected to thermal runaway under the action of internal and external factors such as overcharge, overdischarge, overheat, mechanical collision and the like, a large amount of high-temperature and high-pressure gas is generated in the battery cell 10, so that the pressure in the battery cell 10 is higher than the opening pressure value of the pressure relief mechanism 12, the pressure relief mechanism 12 is changed from the closed state to the open state, and the high-temperature and high-pressure gas in the battery cell 10 can be discharged out of the battery cell 10 through the pressure relief mechanism 12.

As shown in fig. 3, the pressure release mechanism 12 is provided on the first wall 101. It will be appreciated that the first housing 11a includes a shell 111 and an end cap 112, and the pressure relief mechanism 12 may be disposed on the shell 111 of the first housing 11a or may be disposed on the end cap 112 of the first housing 11 a.

The pressure release mechanism 12 may be a weak structure provided on the first wall 101, or the pressure release mechanism 12 may be a pressure valve or the like. When the pressure release mechanism 12 is of a weak structure, the structural strength of the pressure release mechanism 12 is lower than that of other positions of the first housing 11 a. In this way, when the first battery cell 10a is thermally out of control, the high-temperature and high-pressure gas generated by the first battery cell 10a may break the pressure release mechanism 12 to be released outside the first battery cell 10 a.

As an example, pressure relief mechanism 12 may be integrally formed with first wall 101. For example, the pressure release mechanism 12 is a score provided in the first wall 101.

As an example, the pressure relief mechanism 12 may also be provided separately from and connected to the first wall 101.

The second battery cell 10b is opposite to the first wall 101, specifically, at least a portion of the second battery cell 10b may be projected onto the first wall 101 along a direction perpendicular to the first wall 101, that is, the second battery cell 10b may form an orthographic projection on the first wall 101. Illustratively, in some embodiments, as shown in fig. 5 and 6, the wall of the second cell 10b that is used opposite the first wall 101 may be parallel to and opposite the first wall 101. In other embodiments, the walls of the second cell 10b opposite the first wall 101 may form an included angle with the first wall 101 that is greater than 0 ° and less than 180 °.

The heat insulating structure 30 is a member having a heat insulating function. Specifically, the heat insulation structure 30 can block high-temperature and high-pressure gas and high-temperature and high-pressure medium such as flame carried by the high-temperature and high-pressure gas to slow down the heat spreading speed of the high-temperature and high-pressure medium such as flame carried by the high-temperature and high-pressure gas, so that the heat insulation and flame retardance functions can be achieved.

In some embodiments, the thermal insulation structure 30 may be disposed at the second battery cell 10b. In other embodiments, the heat insulating structure 30 may also be provided to the first battery cell 10a. In still other embodiments, the insulating structure 30 may also be disposed on other structures of the battery 100 than the first and second battery cells 10a, 10b, such as may be disposed on the case 20 of the battery 100, with at least a portion of the insulating structure 30 extending between the first wall 101 and the second battery cell 10b.

The orthographic projection of the insulating structure 30 on the first wall 101 refers specifically to the projection of the insulating structure 30 on the first wall 101 in a direction perpendicular to the first wall 101. An orthographic projection of the insulating structure 30 onto the first wall 101 covers the pressure relief mechanism 12, it being understood that at least part of the insulating structure 30 faces and covers the pressure relief mechanism 12 in a direction perpendicular to the first wall 101. In this way, at least part of the heat insulation structure 30 is disposed between the first wall 101 and the second battery cell 10b, and separates the pressure release mechanism 12 of the first battery cell 10a from the second battery cell 10b, thereby performing a heat insulation function between the pressure release mechanism 12 of the first battery cell 10a and the second battery cell 10b.

Wherein, as shown in fig. 4 to 6, the direction perpendicular to the first wall 101 is as shown in the direction Z illustrated in the drawing. I.e. the direction Z is perpendicular to the first wall 101.

Based on the above structure, when the first battery cell 10a is thermally out of control, the high-temperature and high-pressure gas generated by the first battery cell 10a and the high-temperature and high-pressure medium such as flame accompanying the gas can be flushed out of the first battery cell 10a through the pressure release mechanism 12. Since the pressure release mechanism 12 is provided on the first wall 101, the high-temperature and high-pressure medium can be ejected substantially in the direction perpendicular to the first wall 101 when ejected through the pressure release mechanism 12, and thus the high-temperature and high-pressure medium ejected from the pressure release mechanism 12 can be mostly ejected to the portion of the heat insulating structure 30 provided between the first wall 101 and the second battery cell 10 b. Accordingly, the portion of the heat insulating structure 30 disposed between the first wall 101 and the second battery cell 10b may block most of the high temperature and high pressure medium, thereby slowing down the propagation of the high temperature and high pressure medium to the second battery cell 10 b. Based on this, the provision of the heat insulation structure 30 can achieve protection of the second battery cell 10b to some extent to reduce the influence of the occurrence of thermal runaway of the first battery cell 10a on the second battery cell 10 b.

According to the battery 100 provided by the embodiment of the application, the heat insulation structure 30 is arranged between the first wall 101 of the first battery cell 10a and the second battery cell 10b, and the front projection of the heat insulation structure 30 on the first wall 101 covers the pressure release mechanism 12, so that at least part of the heat insulation structure 30 separates the pressure release mechanism 12 of the first battery cell 10a from the second battery cell 10 b. In this way, when the first battery cell 10a is in thermal runaway, the high-temperature and high-pressure gas generated by the first battery cell 10a is sprayed to the heat insulation structure 30 when being sprayed out through the pressure release mechanism 12, and the heat insulation effect of the heat insulation structure 30 can slow down the heat spreading speed of the high-temperature and high-pressure gas, so that the influence of the high-temperature and high-pressure gas on the second battery cell 10b can be greatly reduced. In this way, the problem that the battery cell 10 with thermal runaway thermally propagates to the adjacent battery cell 10 can be improved, and the problem that the chain reaction with thermal runaway of the adjacent battery cell 10 further causes explosion of a plurality of battery cells 10 of the battery 100 can be improved.

Based on the above-described structure, it can be understood that in the battery 100, when the number of the battery cells 10 is two, one of the two battery cells 10 is the first battery cell 10a, and the other is the second battery cell 10.

When the number of the battery cells 10 exceeds two, any two battery cells 10 opposite to each other may be the first battery cell 10a and the second battery cell b, respectively, and then the battery cell 10 may be the first battery cell 10a or the second battery cell 10b. Illustratively, three battery cells 10 arranged along a predetermined direction are defined as a first battery cell 10, a second battery cell 10, and a third battery cell 10, respectively, the first battery cell 10 and the second battery cell 10 being disposed opposite to each other, and with respect to the first battery cell 10 and the second battery cell 10, the first battery cell 10 may be a first battery cell 10a, and the second battery cell 10 may be a second battery cell 10b. The second battery cell 10 and the third battery cell 10 are disposed opposite to each other, and regarding the second battery cell 10 and the third battery cell 10, the second battery cell 10 may be used as the first battery cell 10a, and the third battery cell 10 is the second battery cell 10b. That is, the second battery cell 10 may be the first battery cell 10a in some cases, and the second battery cell 10b in other cases. It is understood that the first battery cell 10a and the second battery cell 10b are identical in structure. Specifically, each of the first battery cell 10a and the second battery cell 10b may include the housing 11 and the pressure release mechanism 12 described above, the housing 11 of the first battery cell 10a is a first housing 11a, and the housing 11 of the second battery cell 10b is a second housing 11b. Both the first housing 11a and the second housing 11b may have a first wall 101, and the wall of the second battery cell 10b opposite to the first wall 101 of the first battery cell 10a is the first wall 101 of the second battery cell 10b.

In the embodiments of the present application, the first wall 101 is the first wall 101 of the first battery cell 10a by default, and the pressure release mechanism 12 is the pressure release mechanism 12 of the first battery cell 10a unless otherwise specified.

In some embodiments, referring to fig. 6, and in combination with other figures, an exhaust passage 40 is provided between the first wall 101 and the insulating structure 30, and the pressure relief mechanism 12 is exposed in the exhaust passage 40.

The pressure relief mechanism 12 is exposed to the exhaust passage 40, which means that the high temperature and high pressure medium discharged through the pressure relief mechanism 12 can directly enter the exhaust passage 40.

The exhaust passage 40 communicates with the external environment.

By providing the exhaust passage 40, when thermal runaway occurs in the first battery cell 10a, the high-temperature and high-pressure medium ejected through the pressure release mechanism 12 can directly enter the exhaust passage 40 and be released to the external environment. In this way, the problem that the high-temperature and high-pressure medium gathers beside the first battery cell 10a and the second battery cell 10b can be improved, the problem that the high-temperature and high-pressure medium thermally spreads to the second battery cell 10b to cause the second battery cell 10b to generate chain reaction can be improved, and the problem that the battery 100 explodes due to the gathering of the high-temperature and high-pressure medium can be improved.

In some embodiments, referring to fig. 7, fig. 7 shows a partial cross-sectional view of a battery provided by other embodiments of the present application, where the second wall 102 of the second battery cell 10b is not provided with the grooves 103 according to the following embodiments. The second battery cell 10b includes a second housing 11b, the second housing 11b having a second wall 102. The second wall 102 is disposed opposite the first wall 101, and at least a portion of the insulating structure 30 is disposed on the second wall 102.

The second wall 102 refers to a wall of the second battery cell 10b for being opposite to the first wall 101. At least a portion of the heat insulation structure 30 is disposed on the second wall 102 to perform a heat insulation function between the pressure release mechanism 12 of the first battery cell 10a and the second battery cell 10 b.

The portion of the heat insulating structure 30 disposed between the first wall 101 and the second battery cell 10b may be disposed entirely on the second wall 102, or only one portion thereof may be disposed on the second wall 102, and the other portion thereof may be disposed at a distance from the second wall 102.

By disposing at least part of the heat insulation structure 30 on the second wall 102 of the second battery cell 10b, when the first battery cell 10a is subject to thermal runaway and the generated high-temperature and high-pressure medium is ejected through the pressure release mechanism 12, the second battery cell 10b can block the high-temperature and high-pressure medium by the heat insulation structure 30 thereon, so as to slow down the spreading speed of the high-temperature and high-pressure medium to the second battery cell 10 b. That is, at least part of the heat insulating structure 30 is provided to the second battery cell 10b, and protection of the second battery cell 10b is achieved. Based on this, according to the position where the second battery cell 10b needs to be protected, the heat insulation structure 30 is correspondingly disposed, so that the disposing process of the heat insulation structure 30 is direct and simple.

Based on the above structure, when the structures of the plurality of battery cells 10 are identical, each battery cell 10 may be provided with the above-described second wall 102 and heat insulation structure 30. The first wall 101 and the second wall 102 of each battery cell 10 are respectively disposed on both sides of the housing 11 in the direction Z, that is, at least part of the heat insulation structure 30 is disposed on a side of the housing 11 facing away from the first wall 101 in the direction Z.

In the embodiments of the present application, the default second wall 102 is the second wall 102 of the second battery cell 10b unless otherwise specified.

In some embodiments, please refer to fig. 6 and 8 together, and in conjunction with other figures, fig. 8 shows a partial cross-sectional view of the first cell 10a and the second cell 10 b. The second wall 102 is recessed away from the first wall 101 to form a groove 103, an orthographic projection of the groove 103 on the first wall 101 covers the pressure relief mechanism 12, and at least part of the heat insulation structure 30 is disposed on a wall of the groove 103.

The direction in which the second wall 102 is recessed away from the first wall 101 is defined to be parallel to the first direction Z.

In some embodiments, referring to fig. 8, the first direction Z may be perpendicular to the first wall 101, that is, the second wall 102 is recessed away from the first wall 101 to form the groove 103, specifically, the second wall 102 is recessed away from the first wall 101 along the direction perpendicular to the first wall 101 (direction Z) to form the groove 103, where the bottom of the groove 103 is opposite to the first wall 101 along the first direction Z. When the bottom of the groove 103 is planar, the bottom of the groove 103 is parallel to the first wall 101. Wherein the first direction Z is parallel to the direction Z illustrated in the figure.

In other embodiments, the first direction Z may not be perpendicular to the first wall 101, that is, the second wall 102 is recessed away from the first wall 101 to form the groove 103, specifically, the second wall 102 is recessed away from the first wall 101 in a direction not perpendicular to the first wall 101 to form the groove 103, where the bottom of the groove 103 is not opposite to the first wall 101. When the bottom of the groove 103 is planar, the bottom of the groove 103 intersects the first wall 101.

The orthographic projection of the groove 103 on the first wall 101 covers the pressure relief mechanism 12, meaning that the groove 103 faces in a direction perpendicular to the first wall 101 and covers the pressure relief mechanism 12. Thus, when at least part of the heat insulation structure 30 is disposed on the wall of the groove 103, at least part of the heat insulation structure 30 disposed in the groove 103 may face and cover the pressure release mechanism 12 along the direction perpendicular to the first wall 101, so as to achieve the heat insulation effect between the pressure release mechanism 12 and the second battery cell 10 b.

By recessing the second wall 102 away from the first wall 101 to form the recess 103 and disposing at least a portion of the insulating structure 30 at the wall of the recess 103, at least a portion of the insulating structure 30 may be received within the recess 103. By means of the arrangement, the size of the portion, extending out of the groove 103, of the heat insulation structure 30 can be reduced, the structural compactness between the first battery cell 10a and the second battery cell 10b can be improved, the exhaust channel 40 can be formed between the heat insulation structure 30 and the first wall 101 conveniently, and the protection effect on the second battery cell 10b can be improved.

Based on the above structure, when the structures of the plurality of battery cells 10 are identical, each battery cell 10 may be provided with the groove 103 described above. The first wall 101 and the second wall 102 of each battery cell 10 are respectively disposed on two sides of the housing 11 along the direction Z, and the second wall 102 of the battery cell 10 is recessed toward the first wall 101 of the battery cell 10 to form a groove 103.

In the embodiments of the present application, the default groove 103 is the groove 103 of the second battery cell 10b unless otherwise specified.

In some embodiments, referring to fig. 6 and 8 together, and in combination with other drawings, the groove 103 is concavely disposed along the first direction Z opposite to the first wall 101, and the first direction Z is perpendicular to the first wall 101. The groove 103 has a first groove wall 104 and a second groove wall 105, and the second groove wall 105 is connected to the first groove wall 104 in a bent manner. The first groove wall 104 is provided at the bottom of the groove 103. The heat insulation structure 30 comprises a first heat insulation member 31, wherein the first heat insulation member 31 is arranged on the first groove wall 104, and the front projection of the first heat insulation member 31 on the first wall 101 covers the pressure release mechanism 12.

As shown in fig. 8, the first groove wall 104 and the second groove wall 105 are inner walls of the groove 103, and the first groove wall 104 and the second groove wall 105 define the groove 103. It is understood that the first groove wall 104 is the groove bottom of the groove 103, and the second groove wall 105 is the groove wall other than the groove bottom among the groove walls of the groove 103.

The first groove wall 104 and the second groove wall 105 are connected in a bending manner, specifically, the first groove wall 104 and the second groove wall 105 are connected, and the second groove wall 105 is bent with respect to the first groove wall 104.

Wherein the second wall 102 is connected with the second groove wall 105 in a bending way. Specifically, the first groove wall 104, the second groove wall 105, and the second wall 102 are sequentially bent and connected along the first direction Z.

The first groove wall 104 may be a plane perpendicular to the first direction Z, a plane forming a preset included angle with the first direction Z, or an arc surface. The second groove wall 105 may be a plane parallel to the first direction Z, a plane intersecting the first direction Z, or an arc surface.

Illustratively, as shown in fig. 8, the first groove wall 104 is a plane perpendicular to the first direction Z, and the first groove wall 104 is opposite to the first wall 101 along the first direction Z and is parallel to the first wall 101. The first groove wall 104 is opposite to the pressure release mechanism 12 along the first direction Z, the first heat insulation piece 31 arranged on the first groove wall 104 is opposite to the pressure release mechanism 12 along the first direction Z, and the wall surface of the first heat insulation piece 31 opposite to the pressure release mechanism 12 is parallel to the first wall 101 and perpendicular to the first direction Z.

Wherein the first insulation 31 is part of the insulation structure 30. Based on the heat insulating function of the heat insulating structure 30, the first heat insulator 31 also has a corresponding heat insulating function.

By adopting the above technical solution, the first heat insulating member 31 is disposed at the bottom of the groove 103, so that the first heat insulating member 31 is opposite to the pressure release mechanism 12 of the first battery cell 10 a. In this way, the first heat insulating member 31 forms an included angle of approximately 90 ° with the ejection direction of the high-temperature and high-pressure medium ejected from the first battery cell 10a as much as possible, so that the high-temperature and high-pressure medium ejected from the first battery cell 10a can be effectively blocked, and the problem of chain reaction caused by the influence of thermal runaway of the first battery cell 10a on the second battery cell 10b can be effectively improved.

In some embodiments, referring to fig. 6, and in combination with other figures, the dimension of the first insulating member 31 in the first direction Z is shown as dimension L1, where the dimension L1 is greater than 0.15mm, and may specifically be 0.16mm, 0.17mm, 0.2mm, 0.25mm, 0.3mm, etc.

When the first heat insulating member 31 is of a sheet-like structure, the dimension L1 of the first heat insulating member 31 in the first direction Z is the thickness dimension of the first heat insulating member 31.

So set up, can make first thermal-insulated piece 31 have the thermal-insulated effect such as better thermal-insulated, fire-retardant, so can effectively realize the thermal-insulated effect between the pressure release mechanism 12 of second battery monomer 10b and first battery monomer 10a, and then can slow down the speed that flame spread at first thermal-insulated piece 31 betterly to effectively improve the problem that the thermal runaway heat of battery monomer 10 spread to adjacent battery monomer 10.

In some embodiments, the first groove wall 104 may not be provided with the first insulation 31, but at least part of the insulation structure 30 is provided with the second groove wall 105 of the groove 103. The front projection of the portion of the insulating structure 30 on the second wall 105 on the first wall 101 covers the pressure relief mechanism 12. Based on this, the high-temperature and high-pressure medium ejected from the pressure release mechanism 12 can be ejected to the portion of the heat insulation structure 30 on the second groove wall 105, so as to obtain the effect of slowing down the heat spreading. When the first direction Z is perpendicular to the first wall 101, the second groove wall 105 needs to be configured as an arc surface or a plane that is not parallel to the direction perpendicular to the first wall 101, so that the portion of the heat insulation structure 30 on the second groove wall 105 can form an orthographic projection on the first wall 101 covering the pressure relief mechanism 12.

In some embodiments, referring to fig. 6 and 8 together, and in combination with other figures, the front projection of the first heat insulation member 31 on the first wall 101 completely covers the pressure release mechanism 12.

By adopting the above technical scheme, when the first battery cell 10a is subject to thermal runaway, the high-temperature and high-pressure medium generated by the first battery cell 10a can be basically sprayed to the first heat insulation member 31, and the first heat insulation member 31 can basically insulate the high-temperature and high-pressure medium from the second battery cell 10b, so that the protection of the battery cell 10 adjacent to the battery cell 10 subject to thermal runaway can be better realized.

In other embodiments, referring to fig. 9, fig. 9 shows a partial cross-sectional view of a battery provided in accordance with still other embodiments of the present application. The front projection of the first insulation 31 onto the first wall 101 may also cover only a part of the pressure relief mechanism 12. At this time, the front projection of the other portion of the heat insulating structure 30 than the first heat insulating member 31 on the first wall 101 may cover another portion of the pressure relief mechanism 12, for example, the front projection of the portion of the heat insulating structure 30 provided on the second groove wall 105 (the second heat insulating member 32) on the first wall 101 may cover another portion of the pressure relief mechanism 12.

In some embodiments, referring to fig. 6 and 8 together, and in combination with other figures, in the first direction Z, the depth of the groove 103 is greater than the size of the first insulating member 31, so that the first wall 101 is spaced from the first insulating member 31 to form the exhaust channel 40.

Wherein the depth of the groove 103 in the first direction Z is as dimension L2 as illustrated in fig. 6 and 8, and the dimension of the first heat insulator 31 in the first direction Z is as dimension L1 as illustrated in fig. 6. The dimension L2 is greater than the dimension L1, so that the first heat insulator 31 is completely accommodated in the groove 103, and a certain interval is formed between the first heat insulator 31 and the first battery cell 10a, thereby forming the exhaust passage 40.

By adopting the above technical solution, the first heat insulating member 31 can be completely located in the groove 103, that is, the first heat insulating member 31 does not extend out of the groove 103 along the first direction Z, that is, does not extend out of the second wall 102 of the second battery cell 10b along the first direction Z. In this way, the arrangement of the first heat insulating member 31 does not interfere with the distribution of the first battery cell 10a and the second battery cell 10b, so that the first battery cell 10a and the second battery cell 10b have higher structural compactness. Specifically, the first battery cell 10a and the second battery cell 10b may abut against each other along the first direction Z, and when the first wall 101 of the first battery cell 10a is parallel to the second wall 102 of the second battery cell 10b, the first wall 101 may abut against the second wall 102, thereby improving the structural compactness between the first battery cell 10a and the second battery cell 10 b.

In addition, the first heat insulating member 31 and the exhaust channel 40 formed by the first battery cell 10a at intervals, when the first battery cell 10a is in thermal runaway, the high-temperature and high-pressure medium generated by the first battery cell 10a can be released into the exhaust channel 40 through the pressure release mechanism 12, so that the release can be better realized, the problem that the high-temperature and high-pressure medium thermally spreads to the second battery cell 10b can be facilitated to be alleviated, and the problem that the battery cell 10 explodes due to the aggregation of the high-temperature and high-pressure medium can be also facilitated to be alleviated.

In some embodiments, referring to fig. 6 and 8 together, and in combination with other figures, the heat insulation structure 30 further includes a second heat insulation member 32, where the second heat insulation member 32 is disposed on the second slot wall 105.

The second heat insulating member 32 is a part of the heat insulating structure 30, and also has a heat insulating function, and the heat insulating function of the second heat insulating member 32 can be referred to the above description of the heat insulating structure 30, and the detailed description will not be repeated here. When the second heat insulating member 32 has a sheet structure, the second heat insulating member 32 is disposed on the second groove wall 105, and specifically, one side of the second heat insulating member 32 in the thickness direction thereof is fixed to the second groove wall 105.

By adopting the above technical solution, the first heat insulator 31 is disposed on the first groove wall 104 of the groove 103, and the second heat insulator 32 is disposed on the second groove wall 105 of the groove 103, that is, the heat insulation structure 30 is disposed on all the groove walls of the groove 103. In this way, when the first battery cell 10a is in thermal runaway, after the high-temperature and high-pressure medium generated by the first battery cell 10a is sprayed out through the pressure release mechanism 12, the high-temperature and high-pressure medium can be sprayed to the groove 103 of the second battery cell 10b, the arrangement of the first heat insulation piece 31 and the second heat insulation piece 32 can basically block the high-temperature and high-pressure medium sprayed into the groove 103, so that the speed of spreading and spreading the high-temperature and high-pressure medium to the second battery cell 10b can be effectively slowed down, the influence of the high-temperature and high-pressure medium on the second battery cell 10b can be greatly reduced, the problem that the battery cell 10 in thermal runaway is spread to the adjacent battery cell 10 can be improved, and the problem of the chain reaction of the thermal runaway of the adjacent battery cell 10 can be improved.

In some embodiments, as shown in fig. 6 and 8, the second slot wall 105 is a plane parallel to the first direction Z, and the second insulation 32 is also parallel to the first direction Z. In this way, the front projection of the second thermal shield 32 onto the first wall 101 does not cover the pressure relief mechanism 12 of the first cell 10 a.

In other embodiments, as shown in fig. 9, the second groove wall 105 is a plane intersecting the first direction Z, and the first groove wall 104 forms an obtuse angle with the second groove wall 105. Based on this, the second thermal shield 32 intersects the first direction Z, and an orthographic projection of the second thermal shield 32 on the first wall 101 may cover a portion of the pressure relief mechanism 12. Alternatively, in still other embodiments, the second slot wall 105 may also be curved, which also facilitates enabling an orthographic projection of the second thermal shield 32 onto the first wall 101 to cover a portion of the pressure relief mechanism 12. Above, the front projection of the first thermal shield 31 onto the first wall 101 covers a further part of the pressure relief mechanism 12.

In some embodiments, referring to fig. 6 and 8 together, and in combination with other figures, an end of the second heat insulating member 32 facing away from the first groove wall 104 along the first direction Z is flush with the second wall 102.

By adopting the above technical solution, the end of the second heat insulating member 32 facing away from the first groove wall 104 along the first direction Z does not extend out of the second wall 102, so that the problem that the first battery cell 10a and the second battery cell 10b have a larger gap due to the second heat insulating member 32 extending out of the second wall 102 can be improved. That is, the arrangement of the second heat insulator 32 does not interfere with the distribution of the first battery cell 10a and the second battery cell 10b, so that the first battery cell 10a and the second battery cell 10b have high structural compactness. Specifically, the first battery cell 10a and the second battery cell 10b may abut against each other along the first direction Z, and when the first wall 101 of the first battery cell 10a is parallel to the second wall 102 of the second battery cell 10b, on the one hand, the first wall 101 may abut against the second wall 102, thereby improving the structural compactness between the first battery cell 10a and the second battery cell 10 b. On the other hand, the end of the second heat insulating member 32 facing away from the first groove wall 104 along the first direction Z may abut against the first wall 101, so that the second heat insulating member 32 may fill the gap between the first wall 101 and the second wall 102 by the abutting effect, and the problem that the high-temperature and high-pressure medium enters the gap between the first wall 101 and the second wall 102 and spreads to the second battery cell 10b can be alleviated, so that the speed of heat spreading to the second battery cell 10b can be slowed down.

In other embodiments, an end of the second insulation 32 facing away from the first channel wall 104 in the first direction Z is spaced from the second wall 102 in the first direction Z.

Based on the above structure, in some implementations, an end of the second thermal shield 32 facing away from the first slot wall 104 in the first direction Z is located between the second wall 102 and the first slot wall 104 in the first direction Z such that an end of the second thermal shield 32 facing away from the first slot wall 104 in the first direction Z is spaced apart from the second wall 102 in the first direction Z. Based on this, the end of the second heat insulating member 32 facing away from the first groove wall 104 along the first direction Z does not extend out of the second wall 102, so that the problem that the second heat insulating member 32 extends out of the second wall 102 to cause a larger gap between the first battery cell 10a and the second battery cell 10b can be improved, and thus, a higher structural compactness between the plurality of battery cells 10 can be achieved.

In other implementations, an end of the second insulation 32 facing away from the first slot wall 104 in the first direction Z is located outside the second wall 102 such that an end of the second insulation 32 facing away from the first slot wall 104 in the first direction Z is spaced from the second wall 102 in the first direction Z. Based on this, the end of the second heat insulating member 32 facing away from the first groove wall 104 along the first direction Z may extend out of the second wall 102 and abut against the first wall 101, so as to fill the gap between the adjacent first battery cell 10a and second battery cell 10b in the first direction Z, and improve the problem that the high-temperature and high-pressure medium thermally spreads to the second battery cell 10b through the gap between the first battery cell 10a and the second battery cell 10 b.

In some embodiments, referring to FIG. 6, and in combination with other figures, the second insulation 32 is coupled to the first insulation 31.

The first heat insulator 31 and the second heat insulator 32 may be integrally formed or may be separately connected.

Since the first groove wall 104 and the second groove wall 105 are connected by bending, the first heat insulator 31 and the second heat insulator 32 are also connected by bending. In some implementations, the first insulation 31 and the second insulation 32 are joined to form a structure that is "L" shaped when the first slot wall 104 and the second slot wall 105 are perpendicular. Wherein the connection of the first and second insulation members 31 and 32 to form a structure having an "L" shape is not meant to be an "L" shape for the entire insulation structure 30.

By adopting the technical scheme, the first heat insulating piece 31 and the second heat insulating piece 32 are connected, and when the first heat insulating piece 31 and the second heat insulating piece 32 are arranged on the second battery cell 10b, the first heat insulating piece 31 and the second heat insulating piece 32 can be positioned together without positioning one by one, so that the assembly process of the first heat insulating piece 31 and the second heat insulating piece 32 and the second battery cell 10b is simplified. In addition, the first heat insulator 31 and the second heat insulator 32 are connected, so that a gap is not formed between the first heat insulator 31 and the second heat insulator 32, and the problem that a high-temperature and high-pressure medium thermally spreads to the second battery cell 10b through the gap between the first heat insulator 31 and the second heat insulator 32 can be improved, compared with the case where no connection is made.

In some embodiments, please refer to fig. 10 to 12 together, and fig. 10 is a partially enlarged view of fig. 4, fig. 11 is an exploded view of a second battery cell 10b according to some embodiments of the present application, and fig. 12 is a partially enlarged view of fig. 11. The groove 103 is concavely provided away from the first wall 101 in the first direction Z and is provided at an end of the second housing 11b in the second direction Y, which intersects the first direction Z.

The first direction Z may or may not be perpendicular to the first wall 101.

In some embodiments, when the second battery cell 10b is rectangular parallelepiped, the first direction Z may be any one of the length direction, the width direction, and the thickness direction of the second battery cell 10b, and the second direction Y is the other direction. Alternatively, at least one of the first direction Z and the second direction Y may each intersect the length direction, the width direction, and the thickness direction of the second battery cell 10 b. As an example, as shown in fig. 11 and 12, the first direction Z is the width direction of the second battery cell 10b, and the second direction Y is the length direction of the second battery cell 10 b.

The groove 103 is provided at an end of the second housing 11b in the second direction Y, and the groove 103 penetrates through one end of the second housing 11b in the second direction Y. Specifically, the groove 103 extends away from the second groove wall 105 to an end face of the second housing 11b in the second direction Y. It will be appreciated that the recess 103 extends through the second housing 11b in the second direction Y, such that the exhaust passage 40 extends through the second housing 11b in the second direction Y, thereby facilitating communication of the exhaust passage 40 to the external environment.

By adopting the above technical solution, the groove 103 penetrates through one end of the second battery cell 10b along the second direction Y, that is, one end of the groove 103 along the second direction Y has an opening. In this way, when the first battery cell 10a is thermally out of control, the generated high-temperature and high-pressure medium is released to the external environment from the opening of the groove 103 along the second direction Y after being sprayed to the groove 103, so that the release of the high-temperature and high-pressure medium is facilitated, the cooling effect can be effectively realized, the problem that the high-temperature and high-pressure medium thermally spreads to the second battery cell 10b can be improved, and the problem that the explosion of a plurality of battery cells 10 occurs due to the accumulation of the high-temperature and high-pressure gas can be improved.

In other embodiments, as shown in fig. 13, fig. 13 is a partial cross-sectional view of a second battery cell 10b according to other embodiments of the present application. The groove 103 may also be provided without penetrating the end of the second housing 11b in the second direction Y. Specifically, in a cross section of the second battery cell 10b perpendicular to the third direction X, the groove 103 is a "U" shaped groove. The third direction X intersects the first direction Z and the second direction Y, respectively.

In some embodiments, referring to fig. 10 to 12 together, the groove 103 also penetrates through both ends of the second housing 11b along the third direction X, or in other embodiments, the groove 103 also penetrates through one end of the second housing 11b along the third direction X.

It is understood that the groove 103 also has openings at one or both ends in the third direction X, and the groove 103 extends to the end face of one or both ends of the second housing 11b in the third direction X. It can be appreciated that the groove 103 penetrates one or both ends of the second housing 11b in the third direction X, so that the exhaust passage 40 penetrates one or both ends of the second housing 11b in the third direction X, thereby facilitating the communication of the exhaust passage 40 to the external environment.

By adopting the above technical solution, the groove 103 is far from the first groove wall 104, penetrates through one end of the second housing 11b along the second direction Y, and penetrates through one end or two ends of the second housing 11b along the third direction X. So set up, when first battery monomer 10a takes place thermal runaway, the high temperature high pressure medium that produces spouts in to the recess 103 of second battery monomer 10b in, can follow the opening of recess 103 in second direction Y and recess 103 along the opening release to the external environment in the third direction X respectively, so the release of high temperature high pressure gas of being convenient for, can effectively realize the cooling effect to improve the problem that adjacent battery monomer 10 takes place the chain reaction, and can improve the problem that high temperature high pressure medium gathers and cause battery monomer 10 explosion.

In some embodiments, the first direction Z is perpendicular to the second direction Y, the second direction Y is perpendicular to the third direction X, and the first direction Z is perpendicular to the third direction X.

Illustratively, when the second battery cell 10b has a rectangular parallelepiped shape, the first direction Z may be a thickness direction of the second housing 11b, the second direction Y is a length direction of the second housing 11b, and correspondingly, the third direction Y is a width direction of the second housing 11 b.

In some embodiments, please refer to fig. 10 to 12, fig. 14 and fig. 15 together, and fig. 14 is an exploded view of a second battery cell 10b according to other embodiments of the present application, and fig. 15 is a partial enlarged view of fig. 14. The end of the second housing 11b in the second direction Y has a preset end face 106; alternatively, the end of the second housing 11b in the third direction X has a preset end face 106; alternatively, the end portion of the second housing 11b in the second direction Y and the end portion of the second housing 11b in the third direction X each have a preset end surface 106. The groove 103 extends to a preset end surface 106, and at least part of the heat insulation structure 30 is disposed on the preset end surface 106.

As shown in fig. 10 to 12, the preset end surface 106 includes a first end surface 1061, and the first end surface 1061 is provided at an end surface of one end of the second housing 11b in the second direction Y. The groove 103 extends through one end of the second housing 11b along the second direction Y, specifically, the groove 103 extends to the first end surface 1061 along the second direction Y away from the second groove wall 105. The insulation structure 30 includes a third insulation 33, the third insulation 33 being disposed at the first end face 1061.

As shown in fig. 14 and 15, the preset end surface 106 further includes a second end surface 1062, and the second end surface 1062 is provided at one end or both ends of the second housing 11b in the third direction X. The groove 103 penetrates one or both ends of the second housing 11b in the third direction X, specifically, the groove 103 extends to the second end surface 1062 in the third direction X. The insulation structure 30 further includes a fourth insulation 34, the fourth insulation 34 being disposed on the second end surface 1062.

The third heat insulator 33 and the fourth heat insulator 34 are part of the heat insulation structure 30, and also have heat insulation function.

So configured, when the first battery cell 10a is thermally out of control, the generated high-temperature and high-pressure medium is sprayed to the groove 103 of the second battery cell 10b, and then the high-temperature and high-pressure medium is released to the external environment along the second direction Y back to the second groove wall 105. At this time, the problem of heat spreading of the high-temperature and high-pressure medium to the first end surface 1061 and thus to the second battery cell 10b can be improved due to the provision of the third heat insulator 33. When the first battery cell 10a is thermally out of control, the generated high-temperature and high-pressure medium is sprayed to the groove 103 of the second battery cell 10b, and then the high-temperature and high-pressure medium is released to the external environment in the third direction Y. At this time, the problem of heat spreading of the high-temperature and high-pressure medium to the second end surface 1062 and thus to the second battery cell 10b can be improved due to the provision of the fourth heat insulator 34. In this way, protection of the second battery cell 10b can be achieved to a certain extent, so as to improve the problem that the second battery cell 10b is affected by the high-temperature and high-pressure medium generated by the first battery cell 10 a.

In some embodiments, referring to fig. 12 and 15, the third heat insulator 33 is connected to the first heat insulator 31. Wherein the third insulation member 33 and the first insulation member 31 form an "L" shape when the first end surface 1061 and the first groove wall 104 are perpendicular. In addition, when the first and second heat insulators 31 and 32 are also connected, the first, second and third heat insulators 31, 32 and 33 may also form a "Z" shape.

In some embodiments, referring to fig. 15, a fourth insulation member 34 is coupled to the first insulation member 31. When the second housing 11b is provided with the second end surface 1062 at one end in the third direction X, the fourth heat insulating member 34 and the first heat insulating member 31 may form an "L" shape. When the second end surface 1062 is disposed at both ends of the second housing 11b along the third direction X, the fourth heat insulating member 34 is connected to both ends of the first heat insulating member 31 along the third direction X, and the first heat insulating member 31 and the fourth heat insulating member 34 may form a "U" shape.

Wherein the first, third and fourth heat insulators 31, 33 and 34 may be connected.

In some embodiments, referring to fig. 6, 10, 12 and 15, and referring to the other drawings, the second housing 11b has a flange 113, and a portion of the heat insulation structure 30 at the predetermined end surface 106 abuts against the flange 113.

Here, when the second battery cell 10b is a thin-sheet battery having a small thickness, a flange 113 may be provided in the second case 11b to facilitate the welding operation after the electrode assembly is put into the case. Specifically, the flange 113 includes a first flange 1131 and a second flange 1132, the first flange 1131 is disposed at a peripheral edge of the opening side of the housing 111, the second flange 1132 is disposed at a peripheral edge of the end cover 112, and the first flange 1131 and the second flange 1132 may be welded and fixed.

The flange 113 is disposed substantially at a position of the second housing 11b away from the groove 103 along the first direction Z.

As shown in fig. 6, 10 and 12, the portion of the heat insulation structure 30 at the first end surface 1061 (the third heat insulator 33) abuts against the flange 113 along the first direction Z.

As shown in fig. 15, the portion of the insulating structure 30 (the fourth insulating member 34) at the second end surface 1062 abuts against the flange 113 along the first direction Z.

By adopting the above technical scheme, the part of the heat insulation structure 30 on the preset end surface 106 can be propped against the flange 113 at one end far away from the first groove wall 104 along the first direction Z, so that on one hand, the positioning of the heat insulation structure 30 is facilitated, the assembly process of the heat insulation structure 30 and the second shell 11b is simplified, and on the other hand, the heat insulation structure 30 does not need to span the flange 113, so that the problem of failure of the welding effect at the flange 113 caused by the heat insulation structure 30 is solved.

Based on the above structure, when the structures of the plurality of battery cells 10 are identical, each battery cell 10 may be provided with the above-described flange 113. Specifically, the first housing 111 of each battery cell 10 has a first flange 1131, the end cap 112 of each battery cell 10 has a second flange 1132, and the first flange 1131 and the second flange 1132 of each battery cell 10 form the flange 113.

In the embodiments of the present application, the default flange 113, the first flange 1131 and the second flange 1132 are all structures of the second battery cell 10b unless otherwise specified.

In some embodiments, please refer to fig. 16 and 17 together, and fig. 16 is a side view of a second battery cell 10b according to some embodiments of the present application, and fig. 17 is a partial enlarged view of fig. 16. In the preset direction, the ratio of the size of the portion of the heat insulation structure 30 at the wall of the groove 103 to the size of the groove 103 is greater than 0.9. The preset direction crosses the first direction Z.

The preset direction is any direction perpendicular to the first direction Z. It will be appreciated that the ratio of the dimension of the portion of the insulating structure 30 at the wall of the recess 103 to the dimension of the recess 103 is greater than 0.9 in any direction perpendicular to the first direction Z.

For example, the predetermined direction may be a second direction Y in which a ratio of a size of a portion of the heat insulation structure 30 at the wall of the groove 103 to a size of the groove 103 is greater than 0.9.

For example, as shown in fig. 17, the preset direction may also be the third direction X. In the third direction X, the dimension of the portion of the heat insulation structure 30 at the wall of the groove 103 is a dimension L3, the dimension of the groove 103 is a dimension L4, and the ratio of the dimension L3 to the dimension L4 is greater than 0.9. The dimension of the first heat insulating member 31 along the third direction X is also a dimension L3, and the dimension of the first groove wall 104 of the groove 103 along the third direction X is also a dimension L4.

It should be noted that, in the preset direction, when the ratio of the size of the portion of the heat insulation structure 30 at the wall of the groove 103 to the size of the groove 103 is less than or equal to 0.9, at least a portion of the heat insulation structure 30 is disposed behind the groove 103, and the wall of the groove 103 is exposed. In this way, after the high-temperature and high-pressure medium generated by the first battery cell 10a is sprayed to the groove 103 of the second battery cell 10b, the medium easily spreads to the exposed groove wall of the groove 103, and then the medium thermally spreads to the second battery cell 10b. The exposed groove wall may be the first groove wall 104 or the second groove wall 105.

By adopting the above technical scheme, at least part of the heat insulation structure 30 can be approximately paved with the groove wall of the groove 103, so that the protection of the second battery cell 10b can be effectively realized, the heat spreading of the high-temperature high-pressure medium to the groove wall of the groove 103 is restrained, and the influence of the high-temperature high-pressure medium on the second battery cell 10b can be slowed down.

In some embodiments, please refer to fig. 18 and 19 together, and fig. 18 is a top view of a battery 100 according to some embodiments of the present application, and fig. 19 is a partial enlarged view of fig. 18. The first wall 101 is further provided with electrode terminals 13, the electrode terminals 13 being spaced apart from the pressure relief mechanism 12. An orthographic projection of the groove 103 on the first wall 101 covers the electrode terminal 13.

The electrode terminal 13 serves as a current transmission terminal of the first battery cell 10a for transmitting current.

As can be appreciated, the groove 103 faces and covers the electrode terminal 13 in a direction perpendicular to the first wall 101. In this way, the electrode terminal 13 of the first battery cell 10a may protrude into the recess 103 of the second battery cell 10 b.

Through adopting above-mentioned technical scheme for electrode terminal 13 can dodge in recess 103, so set up, make electrode terminal 13's setting can not lead to forming great gap between first battery monomer 10a and the second battery monomer 10b, then first battery monomer 10a and the second battery monomer 10b can support each other and hold, specifically, when first wall 101 and second wall 102 parallel, first wall 101 and second wall 102 can support and hold, so can make between a plurality of battery monomers 10 have higher compactibility of structure.

Based on the above-described structure, when the structures of the plurality of battery cells 10 are identical, each battery cell 10 may be provided with the above-described electrode terminal 13.

Referring to fig. 2, and in combination with other drawings, the electrode terminals 13 of two adjacent battery cells 10 may be electrically connected by the bus member 60.

In the embodiments of the present application, the default electrode terminal 13 is the electrode terminal 13 of the second battery cell 10b unless otherwise specified.

In some embodiments, referring to fig. 6, and in combination with other figures, the insulating structure 30 is bonded to the second cell 10b.

Specifically, an adhesive layer 50 is provided between the heat insulating structure 30 and the second battery cell 10b, and the heat insulating structure 30 is fixed to the second battery cell 10b by the adhesive layer 50. The adhesive layer 50 may be a structural adhesive layer, a double-sided adhesive layer, or the like.

Specifically, the heat insulating structure 30 is adhered to the second housing 11b of the second battery cell 10b.

Through adopting above-mentioned technical scheme, when setting up thermal-insulated structure 30 on second battery monomer 10b, can set up adhesive linkage 50 on thermal-insulated structure 30, then with thermal-insulated structure 30 have one side of adhesive linkage 50 bond on second battery monomer 10b can, so make the technology that sets up thermal-insulated structure 30 on second battery monomer 10b very simple convenient.

In some embodiments, referring to fig. 20, and in combination with other figures, fig. 20 is a partial cross-sectional view of a battery 100 according to still other embodiments of the present application. The heat insulating structure 30 is provided on the first wall 101.

Specifically, the heat insulation structure 30 is connected to the first wall 101, and at least a portion of the heat insulation structure 30 is disposed between the first wall 101 and the second battery cell 10b to achieve a heat insulation effect between the pressure release mechanism 12 and the second battery cell 10 b.

Through adopting above-mentioned technical scheme for thermal-insulated structure 30 sets up in first battery monomer 10a, in order to slow down the high temperature high pressure medium out diffusion's that first battery monomer 10a produced speed, and then can realize the protection to adjacent battery monomer 10 (second battery monomer 10 b).

In some embodiments, referring to fig. 4 to 6 together, and referring to other drawings, the first battery cell 10a and the second battery cell 10b are arranged along the first direction Z, the second battery cell 10b has a second wall 102, the second wall 102 is disposed opposite to the first wall 101, and the first wall 101 and the second wall 102 are perpendicular to the first direction Z.

It will be appreciated that the first wall 101 and the second wall 102 are parallel and each perpendicular to the first direction Z.

By adopting the above technical solution, the first wall 101 and the second wall 102 are parallel, and the first wall 101 and the second wall 102 can be mutually abutted, so as to improve the structural compactness between the first battery cell 10a and the second battery cell 10 b. Moreover, when at least part of the heat insulation structure 30 is disposed on the second wall 102, the heat insulation structure 30 located on the second wall 102 is disposed opposite to the pressure release mechanism 12, so that the heat insulation structure 30 can realize the heat insulation effect between the pressure release mechanism 12 and the second battery cell 10 b.

In some embodiments, referring to fig. 4, and in combination with other figures, the area of the first wall 101 is larger than the area of the other walls of the first housing 11 a.

By adopting the technical scheme, the pressure release mechanism 12 is arranged on the wall with the largest area of the first shell 11a, so that the operation of forming the pressure release mechanism 12 on the first shell 11a is very convenient and simple.

In some embodiments, referring to fig. 4 to 6 together, and referring to other drawings, the first housing 11a is rectangular, and the first wall 101 is disposed on one side of the first housing 11a along the thickness direction of the first housing 11 a.

Wherein, for the first housing 11a in a rectangular parallelepiped shape, the thickness of the first housing 11a is smaller than the length and width. When the thickness of the first housing 11a is designed to be relatively small, the end face dimension of the first housing 11a in the length direction or the width direction is small, so that the process of setting the pressure release mechanism 12 may be difficult. The side surface of the first housing 11a in the thickness direction is generally a large surface of the first housing 11a, which facilitates the arrangement of the pressure release mechanism 12.

Therefore, by adopting the above technical scheme, the pressure release mechanism 12 is arranged on one side of the first housing 11a along the thickness direction, and the setting process of the pressure release mechanism 12 is simplified.

In some embodiments, referring to fig. 4 and fig. 6 together, and referring to other drawings, pressure release mechanisms 12 are disposed at two ends of the first housing 11a along the length direction, and heat insulation structures 30 are disposed at two ends of the second battery cell 10 along the length direction of the first housing 11 a. The heat insulation structures 30 at two ends of the second battery unit 10 are respectively in one-to-one correspondence with the pressure release mechanisms 12 at two ends of the first housing 11a, and the orthographic projection of the heat insulation structures 30 at two ends of the second battery unit 10 on the first wall 101 covers the corresponding pressure release mechanisms 12.

Through adopting above-mentioned technical scheme, when first battery monomer 10a takes place thermal runaway, the produced high temperature high pressure medium of first battery monomer 10a accessible along the decompression mechanism 12 blowout at length direction both ends, the thermal-insulated structure 30 at length direction both ends of second battery monomer 10b can correspond to block the high temperature high pressure medium of spouting from the decompression mechanism 12 at first battery monomer 10a both ends to can improve the efficiency that the high temperature high pressure medium of first battery monomer 10a released, be convenient for battery monomer 10 quick pressure release, can improve the problem that takes place the explosion, and can also improve the problem that high temperature high pressure medium heat spread to second battery monomer 10 b.

In some embodiments, the thermal conductivity of the insulating structure 30 is less than or equal to 0.7W/m ^. K (watt/meter) ^. Degree).

For example, the thermal conductivity of the thermal insulation structure 30 may be 0.7W/mK, 0.65W/mK, 0.6W/mK, 0.55W/mK, 0.5W/mK, or the like.

The heat insulation structure 30 is set to be a structure with smaller heat conductivity coefficient, so that the heat insulation structure 30 has weaker heat conduction effect, and when the first battery cell 10a is in thermal runaway and generates high-temperature high-pressure medium, the heat insulation structure 30 is difficult to transfer the heat of the high-temperature high-pressure medium to the second battery cell 10b, namely, a better heat insulation effect is achieved, and the technical problem that the adjacent battery cells 10 are subjected to chain reaction when the battery cells 10 are in thermal runaway can be effectively solved.

In some embodiments, the melting point of the insulating structure 30 is greater than 800 ℃.

For example, the melting point of the heat insulating structure 30 may be 800 ℃, 810 ℃, 820 ℃, 830 ℃, 850 ℃, 900 ℃, 950 ℃, 1000 ℃, or the like.

So set up, set up heat insulation structure 30 as the great structure of fusing point, when first battery monomer 10a takes place thermal runaway, when the high temperature high pressure medium that produces spouts to second battery monomer 10b, this heat insulation structure 30 can be difficult to melt under the high temperature, and then can exert the heat-proof function effectively to realize the protection to second battery monomer 10b, and then improve the technical problem that causes adjacent battery monomer 10 to take place the chain reaction when battery monomer 10 takes place thermal runaway.

In some embodiments, the insulating structure 30 is a mica structure, a ceramic structure, a glass fiber structure, a carbon-carbon composite piece, or a pre-oxidized silk aerogel piece.

That is, the material of the heat insulation structure 30 may be at least one of mica, ceramic, glass fiber, carbon-carbon composite material, and pre-oxidized fiber aerogel.

By adopting the above materials for the heat insulation structure 30, the heat insulation structure 30 is a high temperature resistant structure with higher melting point and lower heat conductivity coefficient, so that the heat insulation structure 30 has better heat insulation effect, and further, the speed of transferring high-temperature and high-pressure medium from the first battery monomer 10a to the second battery monomer 10b can be effectively slowed down, and further, the technical problem that the adjacent battery monomers 10 generate chain reaction when the battery monomers 10 generate thermal runaway can be effectively improved.

Referring to fig. 1, in combination with other drawings, a second aspect of the present application provides an electric device, which includes a battery 100. The battery 100 provided in this embodiment is the same as the battery 100 provided in the above embodiment, and specific reference may be made to the description of the battery 100 in the above embodiment, which is not repeated here.

By adopting the above technical scheme, since the electricity utilization device provided in this embodiment adopts the battery 100 related to the above embodiment, the problem that the battery cell 10 with thermal runaway thermally propagates to the adjacent battery cell 10 can be improved, and further the problem that the adjacent battery cell 10 has a thermal runaway chain reaction and then causes explosion of a plurality of battery cells 10 can be improved.

As an embodiment of the present application, referring to fig. 2 to 4 and 6, a battery 100 includes a plurality of battery cells 10, and the battery cells 10 include a housing 11, a pressure release mechanism 12 and electrode terminals 13. The housing 11 has a first wall 101 and a second wall 102, the first wall 101 and the second wall 102 being provided on both sides of the housing 11 in a first direction Z, respectively, and the first direction Z being perpendicular to the first wall 101. The pressure release mechanism 12 and the electrode terminal 13 are disposed on the first wall 101 at intervals, and the second wall 102 is recessed along the first direction Z to form a groove 103. The battery 100 further comprises a heat insulating structure 30, at least part of the heat insulating structure 30 being arranged at the wall of the recess 103.

The battery cell 10 has a rectangular parallelepiped shape, and the first direction Z is parallel to the thickness direction of the battery cell 10.

When the plurality of battery cells 10 are arranged in sequence along the first direction Z, as shown in fig. 6, two battery cells 10 adjacent along the first direction Z are defined as a first battery cell 10a and a second battery cell 10b, respectively, and the first wall 101 of the first battery cell 10a and the second wall 102 of the second battery cell 10b are disposed opposite to each other along the first direction Z. At this time, the front projection of the groove 103 of the second battery cell 10b on the first wall 101 of the first battery cell 10a covers the pressure release mechanism 12 and the electrode terminal 13 of the first battery cell 10a, and the front projection of the heat insulation structure 30 provided to the second battery cell 10b on the first battery cell 10a covers the pressure release mechanism 12 of the first battery cell 10 a. Based on this, when the first battery cell 10a is thermally out-of-control, the high-temperature and high-pressure medium generated by the first battery cell 10a may be substantially sprayed to the heat insulation structure 30 on the second battery cell 10b, and an effect of slowing down the heat spreading speed is obtained through the heat insulation structure 30, so that the problem of a chain reaction in which the second battery cell 10b is thermally out-of-control due to the influence of the high-temperature and high-pressure medium can be improved.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims

1. A battery, comprising:

a second battery cell opposite the first wall;

the heat insulation structure is at least partially arranged between the first wall and the second battery cell, and the orthographic projection of the heat insulation structure on the first wall covers the pressure release mechanism.

2. The battery of claim 1, wherein a vent passage is provided between the first wall and the insulating structure, the pressure relief mechanism being exposed within the vent passage.

3. The battery of claim 1, wherein the second battery cell comprises a second housing having a second wall opposite the first wall, at least a portion of the insulating structure being disposed on the second wall.

4. A battery according to claim 3, wherein the second wall is recessed away from the first wall to form a recess, an orthographic projection of the recess on the first wall covers the pressure relief mechanism, and at least part of the insulating structure is provided at a wall of the recess.

5. The battery of claim 4, wherein the groove is recessed in a first direction away from the first wall, and wherein the first direction is perpendicular to the first wall; the groove is provided with a first groove wall and a second groove wall which is connected with the first groove wall in a bending way, and the first groove wall is arranged at the bottom of the groove; the heat insulation structure comprises a first heat insulation piece arranged on the first groove wall, and at least part of the pressure relief mechanism is covered by orthographic projection of the first heat insulation piece on the first wall.

6. The battery of claim 5, wherein an orthographic projection of the first thermal shield on the first wall completely covers the pressure relief mechanism.

7. The battery of claim 5, wherein the depth of the recess is greater than the size of the first thermal shield in the first direction such that the first wall is spaced from the first thermal shield to form a vent channel.

8. The battery of claim 5, wherein the insulating structure further comprises a second insulating member disposed on the second channel wall.

9. The battery of claim 8, wherein an end of the second thermal shield facing away from the first slot wall in the first direction is flush with the second wall; alternatively, an end of the second insulating member facing away from the first groove wall in the first direction is spaced apart from the second wall in the first direction.

10. The battery of claim 8, wherein the second thermal shield is coupled to the first thermal shield.

11. The battery of claim 4, wherein the groove is recessed along a first direction and is disposed at an end of the second housing along a second direction, the second direction intersecting the first direction.

12. The battery of claim 11, wherein the groove extends through one or both ends of the second housing in a third direction that intersects the first and second directions, respectively.

13. The battery according to claim 12, wherein an end of the second case in the second direction and/or an end of the second case in the third direction has a predetermined end face, the groove extends to the predetermined end face, and at least part of the heat insulating structure is provided at the predetermined end face.

14. The battery of claim 13, wherein the second housing has a flange against which a portion of the thermally insulating structure at the predetermined end face abuts.

15. The battery of claim 4, wherein the groove is recessed in a first direction; in a preset direction, the ratio of the size of the part of the heat insulation structure on the wall of the groove to the size of the groove is larger than 0.9, and the preset direction is intersected with the first direction.

16. The battery of claim 4, wherein the first wall is further provided with electrode terminals spaced apart from the pressure relief mechanism, and an orthographic projection of the recess on the first wall covers the electrode terminals.

17. The battery of any of claims 1-16, wherein the insulating structure is bonded to the second cell.

18. The battery of claim 1 or 2, wherein the insulating structure is provided to the first wall.

19. The battery of any one of claims 1-16, wherein the first cell and the second cell are aligned along a first direction, the second cell having a second wall opposite the first wall, the second wall being perpendicular to the first direction.

20. The battery of any one of claims 1-16, wherein the first wall has an area greater than an area of the other walls of the first housing.

21. The battery of any one of claims 1-16, wherein the thermal insulation structure has a thermal conductivity of 0.7W/m-K or less; and/or the melting point of the heat insulation structure is greater than 800 ℃.

22. The battery of any one of claims 1-16, wherein the insulating structure is a mica structure, a ceramic structure, a glass fiber structure, a carbon-carbon composite piece, or a pre-oxidized silk aerogel piece.

23. An electrical device comprising a battery according to any one of claims 1-22.