Battery and electric device

Abstract

The invention discloses a battery (100) and a power utilization device, the power utilization device comprises the battery (100), the battery (100) comprises a first battery monomer (10a) and a second battery monomer (10b), the first battery monomer comprises a first shell (11a) and a pressure relief mechanism (12), the first shell (11a) is provided with a first wall (101), and the pressure relief mechanism (12) is arranged on the first wall (101). The second battery cell (10b) faces the first wall (101). At least part of the heat insulation structure (30) is arranged between the first wall (101) and the second battery cell (10b), and the orthographic projection of at least part of the heat insulation structure (30) on the first wall (101) covers the pressure relief mechanism (12). According to the arrangement, the problem that heat of the first battery monomer (100) spreads to the second battery monomer (100) can be solved, and the problem that a plurality of battery monomers (100) explode due to a chain reaction of thermal runaway of the second battery monomer (100) is further solved.

Description

Batteries and electrical devices Technical Field

[0001] The present application relates to the technical field of battery thermal management, and in particular to a battery and an electrical device. Background Art

[0002] In some cases, the high-temperature, high-pressure gas and the accompanying flames discharged from a battery cell during thermal runaway will spread rapidly and easily spread to adjacent battery cells, causing a chain reaction in the adjacent battery cells.

[0003] Summary of the Invention

[0004] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery and an electrical device that can improve the technical problem that a chain reaction occurs in adjacent battery cells when a battery cell experiences thermal runaway.

[0005] The technical solution adopted in the embodiment of this application is:

[0006] In a first aspect, an embodiment of the present application provides a battery, comprising:

[0007] A first battery cell includes a first housing and a pressure relief mechanism, wherein the first housing is provided with a first wall and the pressure relief mechanism is provided on the first wall;

[0008] a second battery cell, opposite to the first wall;

[0009] The heat insulation structure is at least partially disposed 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 relief mechanism.

[0010] The battery provided in an embodiment of the present application provides a thermal insulation structure between the first wall of a first battery cell and a second battery cell, and the orthographic projection of the thermal insulation structure on the first wall covers the pressure relief mechanism. This allows at least a portion of the thermal insulation structure to separate the pressure relief mechanism of the first battery cell from the second battery cell. Thus, when thermal runaway occurs in the first battery cell, the high-temperature, high-pressure medium generated by the first battery cell will be ejected through the pressure relief mechanism directly toward the thermal insulation structure. The thermal insulation effect of the thermal insulation structure can slow the heat spread of the high-temperature, high-pressure medium, thereby significantly reducing the impact of the high-temperature, high-pressure medium on the second battery cell. This can alleviate the problem of heat spreading from a thermal runaway battery cell to adjacent battery cells, thereby alleviating the chain reaction problem of thermal runaway in adjacent battery cells.

[0011] In some embodiments, an exhaust channel is provided between the first wall and the thermal insulation structure, and the pressure relief mechanism is exposed in the exhaust channel.

[0012] By providing the exhaust channel, the high-temperature and high-pressure medium generated by the first battery cell can be well released through the exhaust channel, thereby improving the problem of high-temperature and high-pressure medium accumulation.

[0013] In some embodiments, the second battery cell includes a second housing having a second wall opposite to the first wall, and at least a portion of the thermal insulation structure is disposed on the second wall.

[0014] By arranging at least a portion of the heat insulation structure on the second wall of the second battery cell, the heat insulation structure can protect the second battery cell, making the arrangement position of the heat insulation structure very simple.

[0015] In some embodiments, the second wall is recessed away from the first wall to form a groove, the orthographic projection of the groove on the first wall covers the pressure relief mechanism, and at least a portion of the thermal insulation structure is disposed on the groove wall.

[0016] By adopting the above technical solution, the size of the portion of the thermal insulation structure that protrudes outside the groove can be reduced, thereby alleviating the problem of a large gap between the first and second battery cells caused by the thermal insulation structure protruding outside the groove, thereby facilitating improved structural compactness between the first and second battery cells. Furthermore, it also facilitates the formation of an exhaust channel.

[0017] In some embodiments, the groove is recessed along a first direction facing away from the first wall, and the first direction is perpendicular to the first wall; the groove has a first groove wall and a second groove wall bent and connected to the first groove wall, and the first groove wall is arranged at the bottom of the groove; the thermal insulation structure includes a first thermal insulation member arranged on the first groove wall, and the positive projection of the first thermal insulation member on the first wall covers at least part of the pressure relief mechanism.

[0018] By adopting the above technical solution, the first thermal insulation member is arranged at the bottom of the groove, so that the first thermal insulation member is directly opposite the pressure relief mechanism of the first battery cell. In this way, the first thermal insulation member can form an angle as close to 90° as possible with the ejection direction of the high-temperature and high-pressure medium ejected from the first battery cell, thereby effectively blocking the high-temperature and high-pressure medium ejected from the first battery cell, and further improving the problem of the second battery cell being affected by the thermal runaway of the first battery cell, resulting in a chain reaction.

[0019] In some embodiments, an orthographic projection of the first thermal insulation member on the first wall completely covers the pressure relief mechanism.

[0020] By adopting the above technical solution, when the first battery cell experiences thermal runaway, the high-temperature and high-pressure medium generated by the first battery cell can basically be sprayed toward the first thermal insulation component, and the first thermal insulation component can basically isolate the high-temperature and high-pressure medium from the second battery cell, thereby better protecting the battery cells adjacent to the battery cell experiencing thermal runaway.

[0021] In some embodiments, in the first direction, a depth of the groove is greater than a dimension of the first thermal insulation member, so that the first wall is spaced apart from the first thermal insulation member to form an exhaust channel.

[0022] By adopting the above technical solution, the first and second battery cells can achieve a highly compact structure. In addition, it helps to form an exhaust channel between the first and second battery cells, thereby alleviating the problem of battery cell explosion caused by the accumulation of high-temperature and high-pressure media.

[0023] In some embodiments, the thermal insulation structure further includes a second thermal insulation member disposed on the second groove wall.

[0024] By adopting the above technical solution, the arrangement of the first thermal insulation member and the second thermal insulation member enables the thermal insulation structure to better block the high-temperature and high-pressure medium located in the groove, thereby slowing down the spread and propagation speed of the high-temperature and high-pressure medium and improving the problem of heat from the first battery cell spreading to the second battery cell.

[0025] In some embodiments, one end of the second thermal insulation member facing away from the first groove wall along the first direction is flush with the second wall; or, one end of the second thermal insulation member facing away from the first groove wall along the first direction is spaced apart from the second side wall in the first direction.

[0026] By adopting the above technical solution, the end of the second thermal insulation member facing away from the first slot wall in the first direction can be flush with the second wall. This can improve the problem of the high-temperature and high-pressure medium of the first battery cell being transferred from the gap between the first and second battery cells to the second battery cell, and can also improve the structural compactness between the first and second battery cells. The end of the second thermal insulation member facing away from the first slot wall in the first direction can also be extended outside the second wall in the first direction to improve the problem of the high-temperature and high-pressure medium of the first battery cell being transferred from the gap between the first and second battery cells to the second battery cell. The end of the second thermal insulation member facing away from the first slot wall in the first direction can also be lowered from the second wall in the first direction to improve the structural compactness between the first and second battery cells.

[0027] In some embodiments, the second thermal insulation member is connected to the first thermal insulation member.

[0028] By adopting the above technical solution, there is no gap between the first thermal insulation member and the second thermal insulation member, thereby improving the problem of high-temperature and high-pressure medium heat spreading to the second battery cell through the gap between the first thermal insulation member and the second thermal insulation member.

[0029] In some embodiments, the groove is recessed along the first direction and is disposed at an end portion of the second housing along the second direction, and the second direction intersects the first direction.

[0030] By adopting the above technical solution, the release of high-temperature and high-pressure media is facilitated, and the temperature reduction effect can be effectively achieved, thereby improving the problem of chain reaction occurring in the second battery cell.

[0031] In some embodiments, the groove further passes through one end or both ends of the second housing along a third direction, and the third direction intersects with the first direction and the second direction respectively.

[0032] By adopting the above technical solution, when the high-temperature and high-pressure medium generated by thermal runaway of the first battery cell is sprayed into the groove of the second battery cell, it can be released to the external environment from one end or both ends of the groove along the third direction, and can also be released to the external environment along one end of the groove along the second direction, which facilitates the release of the high-temperature and high-pressure medium and can effectively achieve a cooling effect to improve the problem of chain reaction in the second battery cell.

[0033] In some embodiments, the end of the second shell along the second direction and / or the end of the second shell along the third direction has a preset end surface, the groove extends to the preset end surface, and at least a portion of the thermal insulation structure is arranged on the preset end surface.

[0034] By adopting the above technical solution, when the first battery cell experiences thermal runaway, the high-temperature and high-pressure medium generated enters the groove of the second battery cell, and when released, the thermal insulation structure located at the preset end face can improve the problem of heat from the high-temperature and high-pressure medium spreading to the preset end face and then spreading to the second battery cell.

[0035] In some embodiments, the second shell has a flange, and a portion of the heat insulation structure at the predetermined end surface abuts against the flange.

[0036] By adopting the above technical solution, on the one hand, it helps to position the thermal insulation structure and simplifies the assembly process of the thermal insulation structure and the second battery cell. On the other hand, there is no need for the thermal insulation structure to cross the flange, which helps to improve the problem of failure of welding effect at the flange caused by the thermal insulation structure.

[0037] In some embodiments, in a preset direction, a ratio of a size of a portion of the thermal insulation structure on the groove wall to a size of the groove is greater than 0.9, and the preset direction intersects the first direction.

[0038] By adopting the above technical solution, at least part of the thermal insulation structure can roughly cover the groove wall of the groove, thereby effectively protecting the second battery cell and suppressing the heat of the high-temperature and high-pressure medium from spreading to the groove wall of the groove to affect the second battery cell.

[0039] In some embodiments, the first wall is further provided with electrode terminals spaced apart from the pressure relief mechanism, and the orthographic projection of the groove on the first wall covers the electrode terminals.

[0040] By adopting the above technical solution, the groove of the second battery cell can be used to avoid the electrode terminal of the first battery cell, thereby reducing the gap between the first battery cell and the second battery cell, thereby making the first battery cell and the second battery cell have a higher structural compactness.

[0041] In some embodiments, the thermal insulation structure is bonded to the second battery cell.

[0042] By adopting the above technical solution, the process of arranging the heat insulation structure on the second battery cell is made very simple and convenient.

[0043] In some embodiments, the thermal insulation structure is disposed on the first wall.

[0044] By adopting the above technical solution, the heat insulation structure is provided on the first battery cell to slow down the outward diffusion speed of the high-temperature and high-pressure medium generated by the first battery cell, thereby protecting the adjacent battery cells.

[0045] In some embodiments, the first battery cell and the second battery cell are arranged along a first direction, the second battery cell has a second wall opposite to the first wall, and the first wall and the second wall are both perpendicular to the first direction.

[0046] By adopting the above technical solution, the first wall and the second wall can abut against each other, so as to improve the structural compactness between the first battery cell and the second battery cell.

[0047] In some embodiments, the area of ​​the first wall is greater than the areas of the other walls of the first housing.

[0048] By adopting the above technical solution, the pressure relief mechanism is arranged on the wall with the largest area of ​​the first shell, so that the operation of forming the pressure relief mechanism on the first shell is very convenient and simple.

[0049] In some embodiments, the thermal conductivity of the thermal insulation structure is ≤0.7 W / m·K; and / or the melting point of the thermal insulation structure is greater than 800°C.

[0050] By adopting the above technical solution, the heat insulation structure is set to a structure with a lower thermal conductivity and / or a higher melting point, which helps to achieve a better heat insulation effect of the heat insulation structure to protect the second battery cell.

[0051] In some embodiments, the thermal insulation structure is a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material, or a pre-oxidized silk aerogel.

[0052] By adopting the above technical solution, the heat insulation structure is set to a high-temperature resistant structure with low thermal conductivity and high melting point, which helps to achieve better heat insulation effect of the heat insulation structure and protect the second battery cell.

[0053] In a second aspect, an embodiment of the present application provides an electrical device including a battery.

[0054] The electrical device provided in the embodiment of the present application, due to the use of the above-mentioned battery, also has the advantage of improving the problem of heat from the first battery cell spreading to the second battery cell, and can also improve the problem of chain reaction of thermal runaway of adjacent battery cells, and thus can improve the problem of explosion of multiple battery cells to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0056] FIG1 is a schematic diagram of a vehicle provided in some embodiments of the present application;

[0057] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0058] FIG3 is a schematic diagram of a battery cell provided in some embodiments of the present application;

[0059] FIG4 is a partial schematic diagram of a battery provided in some embodiments of the present application;

[0060] FIG5 is a cross-sectional view taken along AA in FIG4 ;

[0061] FIG6 is a partial enlarged view of FIG5;

[0062] FIG7 is a partial cross-sectional view of batteries provided in some other embodiments of the present application;

[0063] FIG8 is a schematic diagram of FIG6 without the heat insulation structure;

[0064] FIG9 is a partial cross-sectional view of batteries provided in some other embodiments of the present application;

[0065] FIG10 is an enlarged view of point B in FIG4 ;

[0066] FIG11 is an exploded view of the cooperation between the second battery cell and the thermal insulation structure of the battery provided in some embodiments of the present application;

[0067] FIG12 is an enlarged view of point C in FIG11 ;

[0068] FIG13 is a partial cross-sectional view of a second battery cell of a battery provided in some other embodiments of the present application;

[0069] FIG14 is an exploded view of the cooperation between the second battery cell and the thermal insulation structure of batteries provided in other embodiments of the present application;

[0070] FIG15 is an enlarged view of point D in FIG14 ;

[0071] FIG16 is a side view of a second battery cell of a battery provided in some embodiments of the present application;

[0072] FIG17 is an enlarged view of point E in FIG16 ;

[0073] FIG18 is a top view of a second battery cell of a battery provided in some embodiments of the present application;

[0074] FIG19 is a partial enlarged view of FIG18;

[0075] FIG20 is a partial cross-sectional view of a battery provided in some further embodiments of the present application.

[0076] In the figures, the following reference numerals are used: 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 10a - first battery cell; 10b - second battery cell; 101 - first wall; 102 - second wall; 103 - groove; 104 - first groove wall; 105 - second groove wall; 106 - preset end face; 1061 - first end face; 1062 - second end face; 11 - housing; 11a - first housing; 11b - second housing; 111 - housing; 112 - end cover; 113 - flange; 1131 - first flange; 1132 - second flange Edge; 12-pressure relief mechanism; 13-electrode terminal; 20-box; 21-first part; 22-second part; 30-thermal insulation structure; 31-first thermal insulation member; 32-second thermal insulation member; 33-third thermal insulation member; 34-fourth thermal insulation member; 40-exhaust channel; 50-adhesive layer; 60-collecting component; Z-first direction; Y-second direction; X-third direction; L1-dimension of the first thermal insulation member in the first direction; L2-depth of the groove in the first direction; L3-dimension of the thermal insulation structure along the third direction; L4-dimension of the groove in the third direction. DETAILED DESCRIPTION

[0077] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0078] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0080] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0081] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0082] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0083] In the battery field, battery cells are usually equipped with pressure relief mechanisms. When a battery cell experiences thermal runaway, the high-temperature and high-pressure gas generated by the battery cell can break through the pressure relief mechanism and be released outside the battery cell.

[0084] In some cases, for thin-film batteries with relatively small thicknesses, to facilitate the installation of the pressure relief mechanism, the pressure relief mechanism is installed on the larger surface of the battery cell, that is, on the side of the battery cell along the thickness direction. For such thin-film batteries with relatively small thicknesses, when there are multiple battery cells, at least some of the battery cells are usually arranged sequentially along the thickness direction of the battery cells, and the pressure relief mechanism of the battery cell inevitably faces the adjacent battery cell.

[0085] In this way, when a battery cell experiences thermal runaway, the high-temperature, high-pressure gas discharged by the battery cell during thermal runaway is directly sprayed toward adjacent battery cells through the pressure relief mechanism, rapidly spreading to adjacent battery cells. In other words, the heat from the battery cell experiencing thermal runaway spreads to adjacent battery cells, causing a chain reaction of thermal runaway in adjacent battery cells. As a result, adjacent battery cells affected by the thermal runaway battery cell face the risk of damage due to high temperatures, or even thermal runaway and explosion.

[0086] Based on the above considerations, a first aspect of an embodiment of the present application provides a battery. A thermal insulation structure is provided between a first wall of a first battery cell and a second battery cell, and the orthographic projection of the thermal insulation structure on the first wall covers a pressure relief mechanism. This allows at least a portion of the thermal insulation structure to separate the pressure relief mechanism of the first battery cell from the second battery cell. Thus, when thermal runaway occurs in the first battery cell, the high-temperature, high-pressure gas generated by the first battery cell is ejected through the pressure relief mechanism toward the thermal insulation structure. The thermal insulation effect of the thermal insulation structure can slow the heat spread of the high-temperature, high-pressure gas, thereby significantly reducing the impact of the high-temperature, high-pressure gas on the second battery cell. This can alleviate the problem of heat spreading from a thermally runaway battery cell to adjacent battery cells, thereby alleviating the chain reaction problem of thermal runaway occurring in adjacent battery cells.

[0087] In some embodiments of the present application, the battery disclosed in the embodiments of the present application can be used in an electrical device that uses the battery as a power source.

[0088] The battery mentioned in the embodiments of this application can be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in hybrid mode through a busbar. Hybrid mode refers to the multiple battery cells being connected in both series and parallel mode.

[0089] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. For example, the battery also includes a fixing assembly consisting of end plates, side plates, and other components. Multiple battery cells can be connected in series, parallel, or in series to form a whole, and then end plates, side plates, and other components are arranged on the outside of the whole to fix the whole, thereby forming a battery module.

[0090] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0091] In some embodiments, when the battery is used in a vehicle, the battery housing can serve as part of the vehicle's chassis structure. For example, a portion of the housing can form at least a portion of the vehicle's chassis, or a portion of the housing can form at least a portion of the vehicle's crossbeams and longitudinal beams.

[0092] In some embodiments of the present application, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0093] Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Vehicles may include gasoline-powered vehicles, gas-powered vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid electric vehicles, or extended-range electric vehicles.

[0094] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0095] Please refer to Figure 1, which is a schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The above-mentioned battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000. In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0096] Please refer to Figure 2, which shows an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of the battery cells 10 described above. The housing 20 is a structure with a storage space inside. The housing 20 can adopt a variety of structures. Specifically, the housing 20 includes a first portion 21 and a second portion 22, which cover each other and together define the storage space. The first portion 21 can be a hollow structure with an opening at one end, and the second portion 22 is a plate-like structure. The second portion 22 covers the open side of the first portion 21, so that the first portion 21 and the second portion 22 jointly define the storage space. Alternatively, the first portion 21 and the second portion 22 can both be hollow structures with an opening at one end, as shown in Figure 2, with the open side of the first portion 21 covering the open side of the second portion 22, so that the first portion 21 and the second portion 22 jointly define the storage space. In addition, the housing 20 composed of the first portion 21 and the second portion 22 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0097] In some implementations, multiple battery cells 10 can be connected in series, in parallel, or in a hybrid manner to form a whole, which is then directly housed in the aforementioned accommodation space formed by the casing 20, as shown in Figure 2. In other implementations, multiple battery cells 10 can be first connected in series, in parallel, or in a hybrid manner to form multiple modules, each of which is then secured by a corresponding fixing assembly to form the aforementioned battery module. In other words, multiple battery cells 10 form multiple aforementioned battery modules, which are then connected in series, in parallel, or in a hybrid manner to form a whole, which is then housed in the accommodation space defined by the casing 20. Based on this, through the above two implementations, the battery cells 10 form a battery pack.

[0098] A battery cell 10 is the smallest unit that stores and outputs electrical energy. It can be a secondary battery or a primary battery. It can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. It can be cylindrical, flat, rectangular, or have other shapes.

[0099] Please refer to Figure 3, which is a schematic diagram of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes a housing 11 and an electrode assembly (not shown in the figure).

[0100] The electrode assembly is the component in the battery cell 10 where the electrochemical reaction occurs. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The tab of the positive electrode sheet is the positive tab, and the tab of the negative electrode sheet is the negative tab. The positive tab and the negative tab can be located together at one end of the main body or respectively at both ends of the main body. The tab is the current transmission end of the electrode assembly, which is used to transmit current.

[0101] In the battery cell 10 , the number of electrode assemblies may be one or more.

[0102] In some cases, the electrode assembly may also be referred to as a battery cell, a bare battery cell, a wound body, a laminated body, etc.

[0103] In some embodiments, the battery cell 10 further includes an electrolyte, which acts as a conductive medium between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte may be selected based on specific needs. The electrolyte may be liquid, gel, or solid.

[0104] The outer shell 11 includes a shell 111 and an end cover 112 . The shell 111 and the end cover 112 are components for jointly defining an internal environment of the battery cell 10 . The internal environment defined by the shell 111 and the end cover 112 is used to accommodate an electrode assembly and an electrolyte.

[0105] 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 is positioned over 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 FIG3 , for a thinner sheet battery, after the end cap 112 is positioned over the opening of the housing 111, the edges of the end cap 112 are secured to the edges of the opening of the housing 111 by welding.

[0106] In other implementations, the shell 111 and the end cap 112 may also be an integrated structure. Specifically, a common connection surface may be formed between the end cap 112 and the shell 111 before the electrode assembly is placed in the shell. After the electrode assembly is placed in the shell, when the electrode assembly needs to be packaged, the end cap 112 is made to cover the shell 111. For example, when the battery cell 10 is a soft-pack battery, the aluminum-plastic film may be punched to form the shell 111 and the end cap 112 of the battery cell 10, and then the electrode assembly may be placed in the internal environment formed by the punched aluminum-plastic film, and then the opening of the aluminum-plastic film may be fixed by side sealing, top sealing, or other edge sealing methods. Of course, the battery cell 10 is not limited to being a soft-pack battery, and the material of the shell 111 and the end cap 112 is not limited to being an aluminum-plastic film.

[0107] It should be added that the number of the end cap 112 can be one. Of course, the number of the end cap 112 can also be two, and the two end caps 112 are respectively arranged at the two ends of the housing 11.

[0108] In the above two implementations, the housing 11 can be a cylindrical housing, a square housing, or other shapes, which can be determined based on the specific shape and size of the electrode assembly. In addition, the housing 111 and the end cap 112 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in this embodiment of the present application.

[0109] It should be noted that although the battery 100 of the present embodiment is an improvement based on the technical problems existing in thin-film batteries with relatively small thickness, the type of battery cells 10 in the battery 100 is not limited to thin-film batteries. In other words, the battery cells 10 of the present embodiment can be cylindrical batteries, prismatic batteries, soft-pack batteries, or battery cells 10 of other shapes. Prismatic batteries include square-shell batteries, blade-shaped batteries, and multi-prismatic batteries.

[0110] Please refer to Figures 4 to 6. Figure 4 shows a partial schematic diagram of a battery provided in some embodiments of the present application, Figure 5 shows a cross-sectional view of Figure 4, and Figure 6 shows a partial enlarged view of Figure 5. The battery 100 provided in some embodiments of the present application includes a first battery cell 10a, a second battery cell 10b, and a heat insulation structure 30. The first battery cell 10a includes a first outer shell 11a and a pressure relief mechanism 12. The first outer shell 11a is provided with a first wall 101, and the pressure relief mechanism 12 is provided on the first wall 101. The second battery cell 10b is arranged opposite to the first wall 101. At least a portion of the heat insulation structure 30 is arranged between the first wall 101 and the second battery cell 10b, and the orthographic projection of the heat insulation structure 30 on the first wall 101 covers the pressure relief mechanism 12.

[0111] It is understood that among the multiple battery cells 10 of the battery 10, two opposing battery cells 10 are respectively a first battery cell 10a and a second battery cell 10b. The first battery cell 10a and the second battery cell 10b both include a housing 11, and the housing 11 of the first battery cell 10a is a first housing 11a.

[0112] The first housing 11 a is a component for defining an internal environment of the first battery cell 10 a . The internal environment defined by the first housing 11 a is used to accommodate an electrode assembly and electrolyte, etc., of the first battery cell 10 a .

[0113] The first wall 101 is a solid wall of the first housing 11a. In some embodiments, as shown in FIG3 , the first wall 101 can be provided on the end cover 112 of the first housing 11a. In other embodiments, the first wall 101 can also be provided on the shell 111 of the first housing 11a.

[0114] The pressure relief mechanism 12 is a pressure relief 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 less than the opening pressure value of the pressure relief mechanism 12, the pressure relief mechanism 12 is in a closed state, and the gas inside the battery cell 10 is not connected to the gas outside. When the battery cell 10 experiences thermal runaway due to internal and external factors such as overcharge, over-discharge, overheating, and mechanical collision, a large amount of high-temperature and high-pressure gas is generated inside the battery cell 10, causing the internal pressure of the battery cell 10 to exceed the opening pressure value of the pressure relief mechanism 12. The pressure relief mechanism 12 then switches from a closed state to an open state, and the high-temperature and high-pressure gas inside the battery cell 10 can be discharged to the outside of the battery cell 10 through the pressure relief mechanism 12.

[0115] 3 , the pressure relief mechanism 12 is provided on the first wall 101. It is understood that the first housing 11a includes a shell 111 and an end cover 112, and the pressure relief mechanism 12 can be provided on the shell 111 or the end cover 112 of the first housing 11a.

[0116] The pressure relief mechanism 12 can be a weak structure located on the first wall 101, or it can be a pressure valve, etc. When the pressure relief mechanism 12 is a weak structure, the structural strength of the pressure relief mechanism 12 is lower than the structural strength of other locations on the first housing 11a. In this way, if the first battery cell 10a experiences thermal runaway, the high-temperature, high-pressure gas generated by the first battery cell 10a can break through the pressure relief mechanism 12 and be released outside the first battery cell 10a.

[0117] As an example, the pressure relief mechanism 12 can be integrally formed with the first wall 101. For example, the pressure relief mechanism 12 is a notch provided on the first wall 101.

[0118] As an example, the pressure relief mechanism 12 may also be provided separately from and connected to the first wall 101 .

[0119] The second battery cell 10b is opposite to the first wall 101. Specifically, this means that at least a portion of the second battery cell 10b can be projected onto the first wall 101 in a direction perpendicular to the first wall 101. In other words, the second battery cell 10b can form an orthographic projection on the first wall 101. For example, in some embodiments, as shown in Figures 5 and 6, the wall of the second battery cell 10b that is opposite to the first wall 101 can be parallel to and directly opposite the first wall 101. In other embodiments, the wall of the second battery cell 10b that is opposite to the first wall 101 can form an angle greater than 0° and less than 180° with the first wall 101.

[0120] The thermal insulation structure 30 is a component with a heat-insulating function. Specifically, the thermal insulation structure 30 can block high-temperature, high-pressure gas and the flames it carries, thereby slowing the heat spread of the high-temperature, high-pressure gas and the flames it carries, thereby providing heat insulation and flame retardancy.

[0121] In some embodiments, the thermal insulation structure 30 may be provided on the second battery cell 10b. In other embodiments, the thermal insulation structure 30 may also be provided on the first battery cell 10a. In still other embodiments, the thermal insulation structure 30 may also be provided on other structures of the battery 100 in addition to the first battery cell 10a and the second battery cell 10b. For example, the thermal insulation structure 30 may be provided on the battery housing 20, with at least a portion of the thermal insulation structure 30 extending between the first wall 101 and the second battery cell 10b.

[0122] The orthographic projection of the thermal insulation structure 30 on the first wall 101 specifically refers to the projection of the thermal insulation structure 30 on the first wall 101 in a direction perpendicular to the first wall 101. The orthographic projection of the thermal insulation structure 30 on the first wall 101 covers the pressure relief mechanism 12. This means that at least a portion of the thermal insulation structure 30 faces and covers the pressure relief mechanism 12 in a direction perpendicular to the first wall 101. Thus, at least a portion of the thermal insulation structure 30 is disposed between the first wall 101 and the second battery cell 10b, separating the pressure relief mechanism 12 of the first battery cell 10a from the second battery cell 10b, thereby providing thermal insulation between the pressure relief mechanism 12 of the first battery cell 10a and the second battery cell 10b.

[0123] 4 to 6 , the direction perpendicular to the first wall 101 is denoted by direction Z. That is, direction Z is perpendicular to the first wall 101 .

[0124] Based on the above structure, when thermal runaway occurs in the first battery cell 10a, the high-temperature, high-pressure gas and accompanying flames generated by the first battery cell 10a, along with other high-temperature, high-pressure media, can escape from the first battery cell 10a through the pressure relief mechanism 12. Because the pressure relief mechanism 12 is located on the first wall 101, the high-temperature, high-pressure media can be ejected generally perpendicularly to the first wall 101. Consequently, the majority of the high-temperature, high-pressure media ejected from the pressure relief mechanism 12 is directed toward the portion of the thermal insulation structure 30 located between the first wall 101 and the second battery cell 10b. Accordingly, the portion of the thermal insulation structure 30 located between the first wall 101 and the second battery cell 10b blocks the majority of the high-temperature, high-pressure media, thereby slowing its spread to the second battery cell 10b. Therefore, the provision of the thermal insulation structure 30 provides a degree of protection for the second battery cell 10b, minimizing the impact of thermal runaway from the first battery cell 10a.

[0125] The battery 100 provided in an embodiment of the present application comprises a thermal insulation structure 30 disposed between the first wall 101 of the first battery cell 10a and the second battery cell 10b. The orthographic projection of the thermal insulation structure 30 on the first wall 101 covers the pressure relief mechanism 12. This ensures that at least a portion of the thermal insulation structure 30 separates the pressure relief mechanism 12 of the first battery cell 10a from the second battery cell 10b. Consequently, when the first battery cell 10a experiences thermal runaway, the high-temperature, high-pressure gas generated by the first battery cell 10a is ejected through the pressure relief mechanism 12 and toward the thermal insulation structure 30. The thermal insulation provided by the thermal insulation structure 30 slows the thermal spread of the high-temperature, high-pressure gas, significantly reducing its impact on the second battery cell 10b. This mitigates the problem of heat from a thermally runaway battery cell 10 spreading to adjacent battery cells 10, thereby alleviating the risk of a chain reaction of thermal runaway in adjacent battery cells 10, which could lead to explosions in multiple battery cells 10 within the battery 100.

[0126] Based on the above 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 10 a and the other is the second battery cell 10 .

[0127] When the number of battery cells 10 exceeds two, any two opposing battery cells 10 can be respectively the first battery cell 10a and the second battery cell 10b, and thus the battery cell 10 can be either the first battery cell 10a or the second battery cell 10b. For example, three battery cells 10 arranged along a predetermined direction are defined as the first battery cell 10, the second battery cell 10, and the third battery cell 10. The first battery cell 10 and the second battery cell 10 are arranged opposite each other. With respect to the first battery cell 10 and the second battery cell 10, the first battery cell 10 can be the first battery cell 10a, and the second battery cell 10 can be the second battery cell 10b. With respect to the second battery cell 10 and the third battery cell 10, the second battery cell 10 can be the first battery cell 10a, and the third battery cell 10 can be the second battery cell 10b. That is, the second battery cell 10 can be the first battery cell 10a in some cases and the second battery cell 10b in other cases. It is understandable that the first battery cell 10a and the second battery cell 10b have the same structure. Specifically, the first battery cell 10a and the second battery cell 10b can both include the aforementioned housing 11 and pressure relief mechanism 12. The housing 11 of the first battery cell 10a is the first housing 11a, and the housing 11 of the second battery cell 10b is the second housing 11b. Both the first housing 11a and the second housing 11b can have a first wall 101. The wall of the second battery cell 10b opposite the first wall 101 of the first battery cell 10a is the first wall 101 of the second battery cell 10b.

[0128] In each embodiment of the present application, unless otherwise specified, it is assumed that the first wall 101 is the first wall 101 of the first battery cell 10 a , and the pressure relief mechanism 12 is the pressure relief mechanism 12 of the first battery cell 10 a .

[0129] In some embodiments, referring to FIG. 6 and in combination with other drawings, an exhaust passage 40 is provided between the first wall 101 and the thermal insulation structure 30 , and the pressure relief mechanism 12 is exposed in the exhaust passage 40 .

[0130] 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 .

[0131] The exhaust passage 40 is connected to the external environment.

[0132] By providing the exhaust passage 40, when thermal runaway occurs in the first battery cell 10a, the high-temperature, high-pressure medium ejected through the pressure relief mechanism 12 can directly enter the exhaust passage 40 and be released to the external environment. This can alleviate the problem of high-temperature, high-pressure medium accumulating near the first and second battery cells 10a, 10b, and thus mitigate the problem of heat from the high-temperature, high-pressure medium spreading to the second battery cell 10b, causing a chain reaction therein. Furthermore, this can mitigate the problem of high-temperature, high-pressure medium accumulation causing explosion of the battery 100.

[0133] In some embodiments, refer to Figure 7, which shows a partial cross-sectional view of a battery provided in another embodiment of the present application. In this embodiment, the second wall 102 of the second battery cell 10b is not provided with the groove 103 described in the following embodiments. The second battery cell 10b includes a 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 thermal insulation structure 30 is disposed on the second wall 102.

[0134] The second wall 102 is a wall of the second battery cell 10b opposite to the first wall 101. At least a portion of the heat insulation structure 30 is disposed on the second wall 102 to provide heat insulation between the pressure relief mechanism 12 of the first battery cell 10a and the second battery cell 10b.

[0135] The portion of the thermal insulation structure 30 disposed between the first wall 101 and the second battery cell 10 b may be completely disposed on the second wall 102 , or only a portion thereof may be disposed on the second wall 102 , with the other portion spaced apart from the second wall 102 .

[0136] By placing at least a portion of the thermal insulation structure 30 on the second wall 102 of the second battery cell 10b, when thermal runaway occurs in the first battery cell 10a and the resulting high-temperature, high-pressure medium is ejected through the pressure relief mechanism 12, the second battery cell 10b can be blocked by the thermal insulation structure 30 thereon, thereby slowing the spread of the high-temperature, high-pressure medium to the second battery cell 10b. In other words, at least a portion of the thermal insulation structure 30 is placed on the second battery cell 10b, effectively protecting the second battery cell 10b. Based on this, the thermal insulation structure 30 can be placed according to the location on the second battery cell 10b that requires protection, making the installation process of the thermal insulation structure 30 straightforward and simple.

[0137] Based on the above structure, when multiple battery cells 10 have the same structure, each battery cell 10 can be provided with the above-mentioned second wall 102 and thermal insulation structure 30. The first wall 101 and second wall 102 of each battery cell 10 are respectively provided on both sides of the outer shell 11 along the direction Z. That is, at least a portion of the thermal insulation structure 30 is provided on the side of the outer shell 11 along the direction Z facing away from the first wall 101.

[0138] In each embodiment of the present application, unless otherwise specified, the second wall 102 is assumed to be the second wall 102 of the second battery cell 10 b .

[0139] In some embodiments, referring to Figures 6 and 8 together, and in conjunction with other figures, Figure 8 illustrates a partial cross-sectional view of a first battery cell 10a and a second battery cell 10b. The second wall 102 is recessed away from the first wall 101 to form a groove 103. The orthographic projection of the groove 103 on the first wall 101 covers the pressure relief mechanism 12, and at least a portion of the thermal insulation structure 30 is disposed on the wall of the groove 103.

[0140] The direction in which the second wall 102 is recessed away from the first wall 101 is defined as being parallel to the first direction Z.

[0141] In some embodiments, referring to FIG8 , 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 along a direction perpendicular to the first wall 101 (direction Z) away from the first wall 101 to form the groove 103. In this case, the bottom of the groove 103 is directly opposite the first wall 101 along the first direction Z. When the bottom of the groove 103 is a plane, the bottom of the groove 103 is parallel to the first wall 101. The first direction Z is parallel to the direction Z shown in the figure.

[0142] 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 along a direction not perpendicular to the first wall 101 to form the groove 103. In this case, the bottom of the groove 103 does not directly face the first wall 101. When the bottom of the groove 103 is a plane, the bottom of the groove 103 intersects the first wall 101.

[0143] The orthographic projection of the groove 103 on the first wall 101 covers the pressure relief mechanism 12, which means that the groove 103 faces and covers the pressure relief mechanism 12 in a direction perpendicular to the first wall 101. In this way, when at least a portion of the thermal insulation structure 30 is disposed on the groove wall of the groove 103, at least the portion of the thermal insulation structure 30 disposed within the groove 103 can face and cover the pressure relief mechanism 12 in a direction perpendicular to the first wall 101, thereby achieving a thermal insulation effect between the pressure relief mechanism 12 and the second battery cell 10b.

[0144] By forming a recess 103 on the second wall 102 away from the first wall 101 and disposing at least a portion of the thermal insulation structure 30 within the walls of the recess 103, at least a portion of the thermal insulation structure 30 can be accommodated within the recess 103. This arrangement reduces the size of the portion of the thermal insulation structure 30 extending outside the recess 103, thereby improving the structural compactness between the first battery cell 10a and the second battery cell 10b. It also facilitates the formation of the aforementioned exhaust channel 40 between the thermal insulation structure 30 and the first wall 101, thereby improving the protective effect of the second battery cell 10b.

[0145] Based on the above structure, when multiple battery cells 10 have the same structure, each battery cell 10 can be provided with the above-mentioned groove 103. The first wall 101 and the second wall 102 of each battery cell 10 are respectively provided on both 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 the groove 103.

[0146] In each embodiment of the present application, unless otherwise specified, the groove 103 is assumed to be the groove 103 of the second battery cell 10 b .

[0147] In some embodiments, referring to Figures 6 and 8 , and in conjunction with other figures, the groove 103 is recessed along a first direction Z, facing away from the first wall 101, with the first direction Z being perpendicular to the first wall 101. The groove 103 has a first groove wall 104 and a second groove wall 105, with the second groove wall 105 being bent and connected to the first groove wall 104. The first groove wall 104 is disposed at the bottom of the groove 103. The thermal insulation structure 30 includes a first thermal insulation member 31, which is disposed on the first groove wall 104. The orthographic projection of the first thermal insulation member 31 on the first wall 101 covers the pressure relief mechanism 12.

[0148] As shown in Figure 8, the first groove wall 104 and the second groove wall 105 are both inner walls of the groove 103, and the first groove wall 104 and the second groove wall 105 define the groove 103. It can be 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 of the groove 103 except the groove bottom.

[0149] The first groove wall 104 and the second groove wall 105 are bent and connected. Specifically, the first groove wall 104 and the second groove wall 105 are connected, and the second groove wall 105 is bent relative to the first groove wall 104 .

[0150] The second wall 102 is bent and connected to the second groove wall 105. Specifically, the first groove wall 104, the second groove wall 105 and the second wall 102 are bent and connected in sequence along the first direction Z.

[0151] The first groove wall 104 can be a plane perpendicular to the first direction Z, a plane forming a preset angle with the first direction Z, or a curved surface. The second groove wall 105 can be a plane parallel to the first direction Z, a plane intersecting the first direction Z, or a curved surface.

[0152] For example, as shown in FIG8 , the first groove wall 104 is a plane perpendicular to the first direction Z. The first groove wall 104 is opposite the first wall 101 along the first direction Z and is parallel to the first wall 101. The first groove wall 104 is opposite the pressure relief mechanism 12 along the first direction Z. The first thermal insulation member 31 provided on the first groove wall 104 is opposite the pressure relief mechanism 12 along the first direction Z. The wall surface of the first thermal insulation member 31 facing the pressure relief mechanism 12 is parallel to the first wall 101 and perpendicular to the first direction Z.

[0153] The first thermal insulation member 31 is a part of the thermal insulation structure 30. Based on the thermal insulation function of the thermal insulation structure 30, the first thermal insulation member 31 also has a corresponding thermal insulation function.

[0154] By adopting the above technical solution, the first thermal insulator 31 is positioned at the bottom of the groove 103, allowing the first thermal insulator 31 to be aligned with the pressure relief mechanism 12 of the first battery cell 10a. This allows the first thermal insulator 31 to form an angle as close to 90° as possible with the direction of the high-temperature, high-pressure medium ejected from the first battery cell 10a, effectively blocking the high-temperature, high-pressure medium ejected from the first battery cell 10a. This, in turn, effectively mitigates the problem of a chain reaction in the second battery cell 10b caused by thermal runaway of the first battery cell 10a.

[0155] In some embodiments, referring to FIG. 6 and in combination with other drawings, the dimension of the first thermal insulation member 31 along the first direction Z is the dimension L1 shown in the figure, and the dimension L1 is greater than 0.15 mm, and specifically can be 0.16 mm, 0.17 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0156] When the first thermal insulation member 31 is a sheet-like structure, the dimension L1 of the first thermal insulation member 31 along the first direction Z is the thickness dimension of the first thermal insulation member 31 .

[0157] Such a setting can make the first thermal insulation member 31 have better thermal insulation, flame retardancy and other thermal insulation effects, so that the thermal insulation effect between the second battery cell 10b and the pressure relief mechanism 12 of the first battery cell 10a can be effectively achieved, and thus the speed of the flame spreading in the first thermal insulation member 31 can be better slowed down, so as to effectively improve the problem of thermal runaway heat of the battery cell 10 spreading to the adjacent battery cell 10.

[0158] In some embodiments, the first groove wall 104 may not be provided with the first thermal insulation member 31, but at least a portion of the thermal insulation structure 30 is provided on the second groove wall 105 of the groove 103. The orthographic projection of the portion of the thermal insulation structure 30 on the second groove 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 relief mechanism 12 can be sprayed toward the portion of the thermal insulation structure 30 on the second groove wall 105 to achieve the effect of slowing down the spread of heat. Specifically, when the first direction Z is perpendicular to the first wall 101, the second groove wall 105 needs to be set to an arc surface or a plane that is not parallel to the direction perpendicular to the first wall 101. In this way, the portion of the thermal insulation structure 30 on the second groove wall 105 can form an orthographic projection on the first wall 101 that covers the pressure relief mechanism 12.

[0159] In some embodiments, please refer to FIG. 6 and FIG. 8 together, and in combination with other drawings, the orthographic projection of the first thermal insulation member 31 on the first wall 101 completely covers the pressure relief mechanism 12 .

[0160] By adopting the above technical solution, when the first battery cell 10a undergoes thermal runaway, the high-temperature and high-pressure medium generated by the first battery cell 10a can basically be sprayed toward the first thermal insulation component 31, and the first thermal insulation component 31 can basically isolate the high-temperature and high-pressure medium from the second battery cell 10b, thereby better protecting the battery cell 10 adjacent to the battery cell 10 that has undergone thermal runaway.

[0161] In other embodiments, please refer to FIG9 , which illustrates a partial cross-sectional view of a battery provided in yet other embodiments of the present application. The orthographic projection of the first thermal insulation member 31 on the first wall 101 may also cover only a portion of the pressure relief mechanism 12. In this case, the orthographic projection of the remaining portion of the thermal insulation structure 30 excluding the first thermal insulation member 31 on the first wall 101 may cover another portion of the pressure relief mechanism 12. For example, the orthographic projection of the portion of the thermal insulation structure 30 disposed on the second slot wall 105 (the second thermal insulation member 32) on the first wall 101 may cover another portion of the pressure relief mechanism 12.

[0162] In some embodiments, please refer to Figures 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 thermal insulation member 31, so that the first wall 101 and the first thermal insulation member 31 are separated to form an exhaust channel 40.

[0163] The depth of the groove 103 along the first direction Z is the dimension L2 shown in Figures 6 and 8 , and the dimension of the first thermal insulator 31 along the first direction Z is the dimension L1 shown in Figure 6 . Dimension L2 is greater than dimension L1, allowing the first thermal insulator 31 to be completely accommodated within the groove 103 and a certain distance to be formed between the first thermal insulator 31 and the first battery cell 10a, thereby forming the exhaust channel 40.

[0164] By adopting the above-mentioned technical solution, the first thermal insulation member 31 can be completely located in the groove 103. In other words, the first thermal insulation member 31 does not extend outside the groove 103 along the first direction Z, and also does not extend outside the second wall 102 of the second battery cell 10b along the first direction Z. In this way, the provision of the first thermal insulation member 31 does not interfere with the distribution of the first battery cell 10a and the second battery cell 10b, thereby achieving a high degree of structural compactness between the first battery cell 10a and the second battery cell 10b. Specifically, the first battery cell 10a and the second battery cell 10b can abut against each other along the first direction Z. 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 can abut against the second wall 102, thereby improving the structural compactness between the first battery cell 10a and the second battery cell 10b.

[0165] In addition, the first thermal insulation member 31 is separated from the first battery cell 10a to form an exhaust channel 40. When the first battery cell 10a experiences 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 relief mechanism 12, thereby enabling better release. This helps to slow down the problem of heat from the high-temperature and high-pressure medium spreading to the second battery cell 10b, and also helps to slow down the problem of the battery cell 10 exploding due to the accumulation of high-temperature and high-pressure medium.

[0166] In some embodiments, please refer to FIG. 6 and FIG. 8 together, and in combination with other drawings, the thermal insulation structure 30 further includes a second thermal insulation member 32 , and the second thermal insulation member 32 is disposed on the second groove wall 105 .

[0167] The second thermal insulator 32 is part of the thermal insulation structure 30 and also provides thermal insulation. The thermal insulation function of the second thermal insulator 32 can be found in the above description of the thermal insulation structure 30 and will not be repeated here. When the second thermal insulator 32 is a sheet-like structure, the second thermal insulator 32 is disposed on the second groove wall 105. Specifically, the second thermal insulator 32 is fixed to the second groove wall 105 along one side of its thickness.

[0168] By adopting the above technical solution, a first thermal insulator 31 is provided on the first wall 104 of the groove 103, and a second thermal insulator 32 is provided on the second wall 105 of the groove 103. In other words, all walls of the groove 103 are provided with the thermal insulation structure 30. Thus, when the first battery cell 10a experiences thermal runaway, the high-temperature, high-pressure medium generated by the first battery cell 10a is ejected through the pressure relief mechanism 12 within the first battery cell 10a and then toward the groove 103 of the second battery cell 10b. The first and second thermal insulators 31 and 32 can substantially block the high-temperature, high-pressure medium ejected into the groove 103, effectively slowing the spread of the high-temperature, high-pressure medium to the second battery cell 10b and significantly reducing its impact on the second battery cell 10b. This can alleviate the problem of heat from a battery cell 10 experiencing thermal runaway spreading to adjacent battery cells 10, thereby mitigating the chain reaction of thermal runaway in adjacent battery cells 10.

[0169] In some embodiments, as shown in Figures 6 and 8 , the second slot wall 105 is a plane parallel to the first direction Z, and the second thermal insulation member 32 is also parallel to the first direction Z. In this way, the orthographic projection of the second thermal insulation member 32 on the first wall 101 does not cover the pressure relief mechanism 12 of the first battery cell 10a.

[0170] In other embodiments, as shown in Figure 9 , the second groove wall 105 is a plane intersecting the first direction Z, and the first groove wall 104 and the second groove wall 105 form an obtuse angle. Based on this, the second thermal insulator 32 intersects the first direction Z, and the orthographic projection of the second thermal insulator 32 on the first wall 101 can cover a portion of the pressure relief mechanism 12. Alternatively, in yet other embodiments, the second groove wall 105 can be a curved surface, which also facilitates the orthographic projection of the second thermal insulator 32 on the first wall 101 covering a portion of the pressure relief mechanism 12. In this manner, the orthographic projection of the first thermal insulator 31 on the first wall 101 covers another portion of the pressure relief mechanism 12.

[0171] In some embodiments, referring to FIG. 6 and FIG. 8 together, and in combination with other drawings, one end of the second thermal insulation member 32 along the first direction Z facing away from the first slot wall 104 is flush with the second wall 102 .

[0172] By adopting the above technical solution, the end of the second thermal insulation member 32 facing away from the first slot wall 104 along the first direction Z does not extend beyond the second wall 102. This can alleviate the problem of a large gap between the first battery cell 10a and the second battery cell 10b caused by the second thermal insulation member 32 extending beyond the second wall 102. In other words, the provision of the second thermal insulation member 32 does not interfere with the distribution of the first battery cell 10a and the second battery cell 10b, thereby achieving a higher level of structural compactness between the first battery cell 10a and the second battery cell 10b. Specifically, the first battery cell 10a and the second battery cell 10b can abut against each other along the first direction Z. When the first wall 101 of the first battery cell 10a and the second wall 102 of the second battery cell 10b are parallel, the first wall 101 can abut against the second wall 102, thereby improving the structural compactness between the first battery cell 10a and the second battery cell 10b. On the other hand, one end of the second thermal insulation member 32 facing away from the first groove wall 104 along the first direction Z can be abutted against the first wall 101. In this way, the second thermal insulation member 32 can fill the gap between the first wall 101 and the second wall 102 through the abutting effect, which can slow down the problem of high-temperature and high-pressure medium entering the gap between the first wall 101 and the second wall 102 and spreading to the second battery cell 10b, thereby slowing down the speed at which heat spreads to the second battery cell 10b.

[0173] In other embodiments, one end of the second thermal insulation member 32 facing away from the first slot wall 104 along the first direction Z is spaced apart from the second wall 102 in the first direction Z.

[0174] Based on the above structure, in some implementations, the end of the second thermal insulator 32 facing away from the first slot wall 104 along the first direction Z is located between the second wall 102 and the first slot wall 104 in the first direction Z, so that the end of the second thermal insulator 32 facing away from the first slot wall 104 along the first direction Z is spaced apart from the second wall 102 in the first direction Z. In this manner, the end of the second thermal insulator 32 facing away from the first slot wall 104 along the first direction Z does not extend beyond the second wall 102. This can alleviate the problem of a large gap between the first battery cell 10a and the second battery cell 10b caused by the second thermal insulator 32 extending beyond the second wall 102, thereby achieving a more compact structure between the multiple battery cells 10.

[0175] In other implementations, one end of the second thermal insulation member 32 facing away from the first slot wall 104 along the first direction Z is located outside the second wall 102, so that the end of the second thermal insulation member 32 facing away from the first slot wall 104 along 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 thermal insulation member 32 facing away from the first slot wall 104 along the first direction Z can extend outside the second wall 102 and abut against the first wall 101. This can fill the gap between the adjacent first and second battery cells 10a, 10b in the first direction Z, thereby improving the problem of heat from high-temperature, high-pressure media spreading to the second battery cell 10b through the gap between the first and second battery cells 10a, 10b.

[0176] In some embodiments, referring to FIG. 6 and in combination with other drawings, the second thermal insulation member 32 is connected to the first thermal insulation member 31 .

[0177] The first heat insulating member 31 and the second heat insulating member 32 may be an integrated structure or may be connected separately.

[0178] Because the first and second groove walls 104, 105 are bent and connected, the first and second thermal insulation members 31, 32 are also bent and connected. In some implementations, when the first and second groove walls 104, 105 are perpendicular, the structure formed by the connection of the first and second thermal insulation members 31, 32 is L-shaped. However, the description of the first and second thermal insulation members 31, 32 being connected in an L-shape does not necessarily mean that the entire thermal insulation structure 30 is L-shaped.

[0179] By adopting the above technical solution, the first and second thermal insulators 31, 32 are connected. When installing the first and second thermal insulators 31, 32 on the second battery cell 10b, they can be positioned simultaneously, rather than individually. This simplifies the assembly process of the first and second thermal insulators 31, 32 with the second battery cell 10b. Furthermore, compared to a solution without the connection, the connection between the first and second thermal insulators 31, 32 eliminates a gap between them, thus mitigating the problem of heat transfer from high-temperature, high-pressure media to the second battery cell 10b through the gap between the first and second thermal insulators 31, 32.

[0180] In some embodiments, referring to Figures 10 to 12 in conjunction with other figures, Figure 10 is a partial enlarged view of Figure 4, Figure 11 is an exploded view of a second battery cell 10b provided in some embodiments of the present application, and Figure 12 is a partial enlarged view of Figure 11. The groove 103 is recessed away from the first wall 101 along the first direction Z and is disposed at an end of the second housing 11b along the second direction Y, where the second direction Y intersects the first direction Z.

[0181] The first direction Z may be perpendicular to the first wall 101 or may not be perpendicular to the first wall 101 .

[0182] In some embodiments, when the second battery cell 10b is rectangular, the first direction Z can be any one of the length, width, and thickness directions of the second battery cell 10b, and the second direction Y can be another direction. Alternatively, at least one of the first direction Z and the second direction Y can intersect the length, width, and thickness directions of the second battery cell 10b. As an example, as shown in Figures 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 10b.

[0183] The groove 103 is provided at an end portion of the second housing 11b along 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 away from the second groove wall 105 to the end surface of the second housing 11b along the second direction Y. It will be appreciated that, by having the groove 103 extend through the second housing 11b along the second direction Y, the exhaust passage 40 extends through the second housing 11b along the second direction Y, thereby facilitating communication between the exhaust passage 40 and the external environment.

[0184] By adopting the above technical solution, the groove 103 extends through one end of the second battery cell 10b along the second direction Y. That is, the groove 103 has an opening at one end along the second direction Y. Thus, when the first battery cell 10a experiences thermal runaway, the high-temperature, high-pressure medium generated is sprayed toward the groove 103 and then released into the external environment through the opening in the groove 103 along the second direction Y. This facilitates the release of the high-temperature, high-pressure medium, effectively achieving a cooling effect, and can alleviate the problem of heat from the high-temperature, high-pressure medium spreading to the second battery cell 10b. It can also alleviate the problem of high-temperature, high-pressure gas accumulation leading to explosion of multiple battery cells 10.

[0185] In other embodiments, as shown in Figure 13, which is a partial cross-sectional view of a second battery cell 10b provided in other embodiments of the present application, the groove 103 may also be configured to not penetrate the end of the second housing 11b along 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.

[0186] In some embodiments, referring to FIG. 10 to FIG. 12 , the groove 103 further passes through both ends of the second housing 11 b along the third direction X. Alternatively, in other embodiments, the groove 103 further passes through one end of the second housing 11 b along the third direction X.

[0187] It is understood that the groove 103 also has an opening at one or both ends along the third direction X, and the groove 103 extends to the end surface of the second housing 11b at one or both ends along the third direction X. It is understood that the groove 103 penetrates one or both ends of the second housing 11b along the third direction X, so that the exhaust passage 40 passes through one or both ends of the second housing 11b along the third direction X, thereby facilitating the exhaust passage 40 to communicate with the external environment.

[0188] By adopting the above technical solution, the groove 103 extends away from the first groove wall 104 and extends through one end of the second outer shell 11b along the second direction Y, and extends through one or both ends of the second outer shell 11b along the third direction X. With this arrangement, when thermal runaway occurs in the first battery cell 10a, the generated high-temperature, high-pressure medium is ejected into the groove 103 of the second battery cell 10b and then released to the external environment through the openings of the groove 103 along the second direction Y and the openings of the groove 103 along the third direction X, respectively. This facilitates the release of the high-temperature, high-pressure gas, effectively achieving a cooling effect, mitigating the problem of chain reactions between adjacent battery cells 10, and preventing the accumulation of high-temperature, high-pressure medium that could cause explosions in the battery cells 10.

[0189] 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.

[0190] For example, when the second battery cell 10b is in a rectangular parallelepiped shape, the first direction Z may be the thickness direction of the second housing 11b, the second direction Y is the length direction of the second housing 11b, and correspondingly, the third direction Y is the width direction of the second housing 11b.

[0191] In some embodiments, please refer to Figures 10 to 12, 14, and 15 together, and in conjunction with other figures. Figure 14 is an exploded view of a second battery cell 10b provided in other embodiments of the present application, and Figure 15 is a partially enlarged view of Figure 14. The end of the second housing 11b along the second direction Y has a predetermined end surface 106; alternatively, the end of the second housing 11b along the third direction X has a predetermined end surface 106; alternatively, both the end of the second housing 11b along the second direction Y and the end of the second housing 11b along the third direction X have a predetermined end surface 106. The groove 103 extends to the predetermined end surface 106, and at least a portion of the thermal insulation structure 30 is disposed on the predetermined end surface 106.

[0192] As shown in Figures 10 to 12 , the predetermined end surface 106 includes a first end surface 1061, which is disposed at one end of the second housing 11b along 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 along the second direction Y away from the second groove wall 105 to the first end surface 1061. The thermal insulation structure 30 includes a third thermal insulation member 33, which is disposed on the first end surface 1061.

[0193] As shown in Figures 14 and 15 , the predetermined end surface 106 further includes a second end surface 1062, which is provided at one or both ends of the second housing 11b along the third direction X. The groove 103 extends through one or both ends of the second housing 11b along the third direction X. Specifically, the groove 103 extends along the third direction X to the second end surface 1062. The thermal insulation structure 30 further includes a fourth thermal insulation member 34, which is provided at the second end surface 1062.

[0194] The third thermal insulation member 33 and the fourth thermal insulation member 34 are both part of the thermal insulation structure 30 and also have thermal insulation function.

[0195] With this arrangement, when thermal runaway occurs in the first battery cell 10a, the high-temperature, high-pressure medium generated by the device sprays toward the groove 103 of the second battery cell 10b. This medium is then released into the external environment along the second direction Y, away from the second groove wall 105. The third thermal insulator 33 mitigates the problem of heat from the high-temperature, high-pressure medium spreading to the first end surface 1061 and, subsequently, to the second battery cell 10b. When thermal runaway occurs in the first battery cell 10a, the high-temperature, high-pressure medium generated by the device sprays toward the groove 103 of the second battery cell 10b. This medium is then released into the external environment along the third direction Y. The fourth thermal insulator 34 mitigates the problem of heat from the high-temperature, high-pressure medium spreading to the second end surface 1062 and, subsequently, to the second battery cell 10b. This provides protection for the second battery cell 10b to a certain extent, mitigating the problem of the second battery cell 10b being affected by the high-temperature, high-pressure medium generated by the first battery cell 10a.

[0196] In some embodiments, referring to Figures 12 and 15 , the third thermal insulator 33 is connected to the first thermal insulator 31. When the first end surface 1061 is perpendicular to the first slot wall 104, the third thermal insulator 33 and the first thermal insulator 31 form an "L" shape. Furthermore, when the first thermal insulator 31 and the second thermal insulator 32 are also connected, the first thermal insulator 31, the second thermal insulator 32, and the third thermal insulator 33 can also form a "Z" shape.

[0197] In some embodiments, as shown in Figure 15 , the fourth thermal insulator 34 is connected to the first thermal insulator 31. When the second end surface 1062 is provided at one end of the second housing 11b along the third direction X, the fourth thermal insulator 34 and the first thermal insulator 31 may form an "L" shape. When the second end surface 1062 is provided at both ends of the second housing 11b along the third direction X, the fourth thermal insulator 34 is connected to both ends of the first thermal insulator 31 along the third direction X. In this case, the first and fourth thermal insulators 31 and 34 may form a "U" shape.

[0198] The first thermal insulation member 31 , the third thermal insulation member 33 and the fourth thermal insulation member 34 may be connected.

[0199] In some embodiments, please refer to FIG. 6 , FIG. 10 , FIG. 12 and FIG. 15 , and in combination with other drawings, the second housing 11 b has a flange 113 , and a portion of the heat insulation structure 30 on the predetermined end surface 106 abuts against the flange 113 .

[0200] It should be noted that when the second battery cell 10b is a thin-film battery, a flange 113 can be provided on the second housing 11b to facilitate welding operations after the electrode assembly is inserted into the housing. Specifically, flange 113 includes a first flange 1131 and a second flange 1132. The first flange 1131 is provided around the edge of the opening side of the housing 111, and the second flange 1132 is provided around the edge of the end cap 112. The first flange 1131 and the second flange 1132 can be welded and secured.

[0201] The flange 113 is substantially disposed at a position of the second housing 11 b away from the groove 103 along the first direction Z.

[0202] As shown in FIG. 6 , FIG. 10 and FIG. 12 , a portion of the thermal insulation structure 30 on the first end surface 1061 (the third thermal insulation component 33 ) abuts against the flange 113 along the first direction Z.

[0203] As shown in FIG. 15 , a portion of the thermal insulation structure 30 on the second end surface 1062 (the fourth thermal insulation component 34 ) abuts against the flange 113 along the first direction Z.

[0204] By adopting the above-mentioned technical solution, the end of the portion of the thermal insulation structure 30 on the preset end face 106 away from the first groove wall 104 along the first direction Z can be abutted against the flange 113. On the one hand, this helps to position the thermal insulation structure 30 and simplifies the assembly process of the thermal insulation structure 30 and the second shell 11b. On the other hand, there is no need for the thermal insulation structure 30 to cross the flange 113, which helps to improve the problem of failure of the welding effect at the flange 113 caused by the thermal insulation structure 30.

[0205] Based on the above structure, when multiple battery cells 10 have the same structure, each battery cell 10 can be provided with the above-mentioned flange 113. Specifically, the first shell 111 of each battery cell 10 has a first flange 1131, and the end cover 112 of each battery cell 10 has a second flange 1132. The first flange 1131 and the second flange 1132 of each battery cell 10 form the flange 113.

[0206] In each embodiment of the present application, unless otherwise specified, it is assumed that the flange 113 , the first flange 1131 , and the second flange 1132 are all structures of the second battery cell 10 b .

[0207] In some embodiments, please refer to Figures 16 and 17 together, and in conjunction with other figures. Figure 16 is a side view of a second battery cell 10b provided in some embodiments of the present application, and Figure 17 is a partially enlarged view of Figure 16. In a predetermined direction, the ratio of the size of the portion of the thermal insulation structure 30 on the wall of the groove 103 to the size of the groove 103 is greater than 0.9. The predetermined direction intersects the first direction Z.

[0208] The preset direction is any direction perpendicular to the first direction Z. It can be understood that in any direction perpendicular to the first direction Z, the ratio of the size of the portion of the thermal insulation structure 30 on the groove wall of the groove 103 to the size of the groove 103 is greater than 0.9.

[0209] For example, the preset direction may be the second direction Y, and in the second direction Y, the ratio of the size of the portion of the thermal insulation structure 30 at the groove wall of the groove 103 to the size of the groove 103 is greater than 0.9.

[0210] For example, as shown in FIG17 , the predetermined direction may also be a third direction X. In the third direction X, the dimension of the portion of the thermal insulation structure 30 at the wall of the groove 103 is dimension L3, and the dimension of the groove 103 is dimension L4. The ratio of dimension L3 to dimension L4 is greater than 0.9. Furthermore, the dimension of the first thermal insulation member 31 along the third direction X is also dimension L3, and the dimension of the first groove wall 104 of the groove 103 along the third direction X is also dimension L4.

[0211] It should be noted that, in a predetermined direction, when the ratio of the size of the portion of the thermal insulation structure 30 located on the groove wall of the groove 103 to the size of the groove 103 is less than or equal to 0.9, the groove wall of the groove 103 may become exposed after at least a portion of the thermal insulation structure 30 is disposed in the groove 103. This allows the high-temperature, high-pressure medium generated by the first battery cell 10a to be sprayed into the groove 103 of the second battery cell 10b, where it can easily spread to the exposed groove wall of the groove 103, thereby spreading heat to the second battery cell 10b. The exposed groove wall may be either the first groove wall 104 or the second groove wall 105.

[0212] By adopting the above technical solution, at least a portion of the thermal insulation structure 30 can roughly cover the groove wall of the groove 103, thereby effectively protecting the second battery cell 10b, inhibiting the heat of the high-temperature and high-pressure medium from spreading to the groove wall of the groove 103, and thus reducing the impact of the high-temperature and high-pressure medium on the second battery cell 10b.

[0213] In some embodiments, please refer to Figures 18 and 19 together with other figures. Figure 18 is a top view of a battery 100 provided in some embodiments of the present application, and Figure 19 is a partially enlarged view of Figure 18. The first wall 101 is further provided with an electrode terminal 13, which is spaced apart from the pressure relief mechanism 12. The orthographic projection of the groove 103 on the first wall 101 covers the electrode terminal 13.

[0214] The electrode terminal 13 serves as a current transmission end of the first battery cell 10 a and is used to transmit current.

[0215] It can be understood that 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 can extend into the groove 103 of the second battery cell 10b.

[0216] By adopting the above technical solution, the electrode terminal 13 can be avoided in the groove 103. Such a configuration does not cause a large gap to be formed between the first battery cell 10a and the second battery cell 10b. The first battery cell 10a and the second battery cell 10b can abut against each other. Specifically, when the first wall 101 and the second wall 102 are parallel, the first wall 101 and the second wall 102 can abut against each other, so that the multiple battery cells 10 have a higher structural compactness.

[0217] Based on the above structure, when the structures of the plurality of battery cells 10 are the same, each battery cell 10 may be provided with the above-mentioned electrode terminal 13 .

[0218] 2 , and in combination with other drawings, the electrode terminals 13 of two adjacent battery cells 10 can be electrically connected via the busbar component 60 .

[0219] In each embodiment of the present application, unless otherwise specified, the electrode terminal 13 is assumed to be the electrode terminal 13 of the second battery cell 10 b .

[0220] In some embodiments, referring to FIG. 6 and in combination with other figures, the thermal insulation structure 30 is bonded to the second battery cell 10 b .

[0221] Specifically, an adhesive layer 50 is provided between the thermal insulation structure 30 and the second battery cell 10b, and the thermal insulation structure 30 is fixed to the second battery cell 10b through the adhesive layer 50. The adhesive layer 50 can be a structural adhesive layer, a double-sided adhesive layer, or other adhesive layer.

[0222] Specifically, the heat insulation structure 30 is adhered to the second housing 11 b of the second battery cell 10 b.

[0223] By adopting the above technical solution, when setting the thermal insulation structure 30 on the second battery cell 10b, an adhesive layer 50 can be set on the thermal insulation structure 30, and then the side of the thermal insulation structure 30 with the adhesive layer 50 can be adhered to the second battery cell 10b. In this way, the process of setting the thermal insulation structure 30 on the second battery cell 10b is very simple and convenient.

[0224] In some embodiments, referring to FIG20 , and in conjunction with other drawings, FIG20 is a partial cross-sectional view of a battery 100 provided in some other embodiments of the present application.

[0225] 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 10 b to achieve a heat insulation effect between the pressure relief mechanism 12 and the second battery cell 10 b .

[0226] By adopting the above technical solution, the heat insulation structure 30 is provided on the first battery cell 10a to slow down the outward diffusion speed of the high-temperature and high-pressure medium generated by the first battery cell 10a, thereby protecting the adjacent battery cell 10 (the second battery cell 10b).

[0227] In some embodiments, please refer to Figures 4 to 6 together, and in combination with other figures, the first battery cell 10a and the second battery cell 10b are arranged along the first direction Z, and the second battery cell 10b has a second wall 102, the second wall 102 is arranged opposite to the first wall 101, and the first wall 101 and the second wall 102 are both perpendicular to the first direction Z.

[0228] It can be understood that the first wall 101 and the second wall 102 are parallel and perpendicular to the first direction Z.

[0229] By adopting the above technical solution, the first wall 101 and the second wall 102 are parallel, allowing them to abut against each other, thereby improving the structural compactness between the first battery cell 10a and the second battery cell 10b. Furthermore, when at least a portion of the thermal insulation structure 30 is disposed on the second wall 102, the thermal insulation structure 30 located on the second wall 102 is positioned opposite the pressure relief mechanism 12, thereby facilitating the thermal insulation structure 30 to achieve a thermal insulation effect between the pressure relief mechanism 12 and the second battery cell 10b.

[0230] In some embodiments, referring to FIG. 4 and in combination with other drawings, the area of ​​the first wall 101 is larger than the areas of other walls of the first housing 11 a .

[0231] By adopting the above technical solution, the pressure relief mechanism 12 is arranged on the wall of the first shell 11 a with the largest area, so that the operation of forming the pressure relief mechanism 12 on the first shell 11 a is very convenient and simple.

[0232] In some embodiments, referring to FIG. 4 to FIG. 6 and other drawings, the first housing 11 a is in a rectangular parallelepiped shape, and the first wall 101 is disposed on one side of the first housing 11 a along the thickness direction of the first housing 11 a .

[0233] For the rectangular first housing 11a, the thickness is smaller than its length and width. When the thickness of the first housing 11a is designed to be relatively small, the end surfaces of the first housing 11a along the length or width directions are relatively small, which can make the installation of the pressure relief mechanism 12 difficult. The side surfaces of the first housing 11a along the thickness direction are generally the larger surfaces of the first housing 11a, which facilitates the installation of the pressure relief mechanism 12.

[0234] Therefore, by adopting the above technical solution, the pressure relief mechanism 12 is provided on one side of the first shell 11 a along the thickness direction, which simplifies the installation process of the pressure relief mechanism 12 .

[0235] In some embodiments, referring to Figures 4 and 6 , and in conjunction with other figures, pressure relief mechanisms 12 are provided at both ends of the first housing 11a along the length direction, and thermal insulation structures 30 are provided at both ends of the second battery cell 10 along the length direction of the first housing 11a. The thermal insulation structures 30 at both ends of the second battery cell 10 correspond one-to-one with the pressure relief mechanisms 12 at both ends of the first housing 11a, and the orthographic projections of the thermal insulation structures 30 at both ends of the second battery cell 10 on the first wall 101 cover the corresponding pressure relief mechanisms 12.

[0236] By adopting the above technical solution, when the first battery cell 10a experiences thermal runaway, the high-temperature and high-pressure medium generated by the first battery cell 10a can be ejected through the pressure relief mechanisms 12 at both ends along the length direction, and the thermal insulation structures 30 at both ends of the second battery cell 10b along the length direction can correspondingly block the high-temperature and high-pressure medium ejected from the pressure relief mechanisms 12 at both ends of the first battery cell 10a, thereby improving the efficiency of releasing the high-temperature and high-pressure medium of the first battery cell 10a, facilitating rapid pressure relief of the battery cell 10, improving the problem of explosion, and also improving the problem of heat from the high-temperature and high-pressure medium spreading to the second battery cell 10b.

[0237] In some embodiments, the thermal conductivity of the insulation structure 30 is less than or equal to 0.7 W / m . K(W / m . Spend).

[0238] For example, the thermal conductivity of the insulation structure 30 may be 0.7 W / m·K, 0.65 W / m·K, 0.6 W / m·K, 0.55 W / m·K, 0.5 W / m·K, or the like.

[0239] By configuring the thermal insulation structure 30 to have a structure with a relatively low thermal conductivity coefficient, the thermal insulation structure 30 can have a relatively weak thermal conductivity effect. Thus, when the first battery cell 10a experiences thermal runaway and generates a high-temperature, high-pressure medium, it is difficult for the thermal insulation structure 30 to transfer the heat of the high-temperature, high-pressure medium to the second battery cell 10b. This means that a better thermal insulation effect is achieved. This can effectively alleviate the technical problem of a chain reaction occurring in adjacent battery cells 10 when a battery cell 10 experiences thermal runaway.

[0240] In some embodiments, the melting point of the thermal insulation structure 30 is greater than 800°C.

[0241] For example, the melting point of the insulation structure 30 may be 800°C, 810°C, 820°C, 830°C, 850°C, 900°C, 950°C, 1000°C, etc.

[0242] In this way, the thermal insulation structure 30 is set to a structure with a relatively high melting point. When the first battery cell 10a undergoes thermal runaway and the high-temperature and high-pressure medium generated is sprayed toward the second battery cell 10b, the thermal insulation structure 30 is not easy to melt at high temperature, and can effectively exert the thermal insulation function, thereby achieving protection for the second battery cell 10b, and thus improving the technical problem of a chain reaction in adjacent battery cells 10 caused by thermal runaway of the battery cell 10.

[0243] In some embodiments, the thermal insulation structure 30 is a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material, or a pre-oxidized silk aerogel.

[0244] That is, the material of the thermal insulation structure 30 may be at least one of mica, ceramic, glass fiber, carbon fiber, carbon-carbon composite material, and pre-oxidized silk aerogel.

[0245] By using the above-mentioned material for the thermal insulation structure 30, the thermal insulation structure 30 becomes a high-temperature resistant structure with a higher melting point and a lower thermal conductivity coefficient. This makes the thermal insulation structure 30 have a better thermal insulation effect, thereby effectively slowing down the speed at which the high-temperature and high-pressure medium is transferred from the first battery cell 10a to the second battery cell 10b, thereby effectively improving the technical problem of a chain reaction in adjacent battery cells 10 caused by thermal runaway of the battery cell 10.

[0246] Referring to FIG. 1 and in conjunction with other drawings, a second aspect of an embodiment of the present application provides an electrical 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 the details can be referred to the description of the battery 100 in the above embodiment, which will not be repeated here.

[0247] By adopting the above technical solution, since the electrical device provided in this embodiment adopts the battery 100 involved in the above embodiment, the problem of heat spreading from a battery cell 10 that has undergone thermal runaway to adjacent battery cells 10 can be improved, thereby improving the problem of a chain reaction of thermal runaway of adjacent battery cells 10 causing explosion of multiple battery cells 10.

[0248] As one embodiment of the present application, please refer to Figures 2 to 4 and 6 . A battery 100 includes a plurality of battery cells 10, each of which includes a housing 11, a pressure relief mechanism 12, and electrode terminals 13. The housing 11 has a first wall 101 and a second wall 102, which are respectively disposed on either side of the housing 11 in a first direction Z, and the first direction Z is perpendicular to the first wall 101. The pressure relief mechanism 12 and the electrode terminal 13 are spaced apart from each other on the first wall 101, and the second wall 102 is recessed along the first direction Z to form a groove 103. The battery 100 also includes a heat insulating structure 30, at least a portion of which is disposed on the wall of the groove 103.

[0249] The battery cell 10 is in a rectangular parallelepiped shape, and the first direction Z is parallel to the thickness direction of the battery cell 10 .

[0250] When multiple battery cells 10 are arranged sequentially along a first direction Z, as shown in FIG6 , two adjacent battery cells 10 along the first direction Z are defined as a first battery cell 10a and a second battery cell 10b , respectively. The first wall 101 of the first battery cell 10a and the second wall 102 of the second battery cell 10b are disposed opposite each other along the first direction Z. In this case, the orthographic 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 relief mechanism 12 and electrode terminal 13 of the first battery cell 10a. Furthermore, the orthographic projection of the thermal insulation structure 30 provided on the second battery cell 10b on the first battery cell 10a covers the pressure relief mechanism 12 of the first battery cell 10a. Consequently, when thermal runaway occurs in the first battery cell 10a, the high-temperature, high-pressure medium generated by the first battery cell 10a can be substantially sprayed toward the thermal insulation structure 30 on the second battery cell 10b. The thermal insulation structure 30 slows the spread of heat, thereby alleviating the chain reaction problem of thermal runaway in the second battery cell 10b caused by the high-temperature, high-pressure medium.

[0251] The above are merely optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A battery (100), wherein: include: A first battery cell (10a) comprises a first housing (11a) and a pressure relief mechanism (12), wherein the first housing (11a) is provided with a first wall (101), and the pressure relief mechanism (12) is provided on the first wall (101); A second battery cell (10b), opposite to the first wall (101); The heat insulation structure (30) is at least partially disposed between the first wall (101) and the second battery cell (10b), and the orthographic projection of the heat insulation structure (30) on the first wall (101) covers the pressure relief mechanism (12).

2. The battery (100) according to claim 1, wherein: An exhaust passage (40) is provided between the first wall (101) and the heat insulation structure (30), and the pressure relief mechanism (12) is exposed in the exhaust passage (40).

3. The battery (100) according to claim 1 or 2, wherein: The second battery cell (10b) comprises a second housing (11b), the second housing (11b) having a second wall (102) opposite to the first wall (101), and at least a portion of the heat insulation structure (30) is disposed on the second wall (102).

4. The battery (100) according to claim 3, wherein: The second wall (102) is recessed away from the first wall (101) to form a groove (103), the positive projection of the groove (103) on the first wall (101) covers the pressure relief mechanism (12), and at least a portion of the heat insulation structure (30) is arranged on the groove wall of the groove (103).

5. The battery (100) according to claim 4, wherein: The groove (103) is arranged to be recessed along a first direction (Z) facing away from the first wall (101), and the first direction (Z) is perpendicular to the first wall (101); the groove (103) comprises a first groove wall (104) and a second groove wall (105) connected to the first groove wall (104) by bending, and the first groove wall (104) is arranged at the groove bottom of the groove (103); the heat insulation structure (30) comprises a first heat insulation member (31) arranged on the first groove wall (104), and the orthographic projection of the first heat insulation member (31) on the first wall (101) covers at least a part of the pressure relief mechanism (12).

6. The battery (100) according to claim 5, wherein: The orthographic projection of the first heat insulating member (31) on the first wall (101) completely covers the pressure relief mechanism (12).

7. The battery (100) according to claim 5 or 6, wherein: In the first direction (Z), the depth of the groove (103) is greater than the size of the first thermal insulation member (31), so that the first wall (101) and the first thermal insulation member (31) are spaced apart to form an exhaust channel (40).

8. The battery (100) according to any one of claims 5 to 7, wherein: The heat insulation structure (30) further comprises a second heat insulation component (32) arranged on the second groove wall (105).

9. The battery (100) according to claim 8, wherein: One end of the second thermal insulation member (32) facing away from the first groove wall (104) along the first direction (Z) is flush with the second wall (102); or, one end of the second thermal insulation member (32) facing away from the first groove wall (104) along the first direction (Z) is spaced apart from the second wall (102) in the first direction (Z).

10. The battery (100) according to claim 8 or 9, wherein: The second thermal insulation member (32) is connected to the first thermal insulation member (31).

11. The battery (100) according to any one of claims 4 to 10, wherein: The groove (103) is recessed along a first direction (Z) and is arranged at an end of the second housing (11b) along a second direction (Y), and the second direction (Y) intersects with the first direction (Z).

12. The battery (100) according to claim 11, wherein: The groove (103) passes through one end or both ends of the second shell (11b) along a third direction (X), and the third direction (X) intersects with the first direction (Z) and the second direction (Y) respectively.

13. The battery (100) according to claim 12, wherein: The end of the second shell (11b) along the second direction (Y) and / or the end of the second shell (11b) along the third direction (X) has a preset end surface (106), the groove (103) extends to the preset end surface (106), and at least a portion of the thermal insulation structure (30) is arranged on the preset end surface (106).

14. The battery (100) according to claim 13, wherein: The second shell (11b) has a flange (113), and a portion of the heat insulation structure (30) on the preset end surface (106) is abutted against the flange (113).

15. The battery (100) according to any one of claims 4 to 14, wherein: The groove (103) is recessed along a first direction (Z); in a preset direction, the ratio of the size of the portion of the heat insulation structure (30) on the groove wall of the groove (103) to the size of the groove (103) is greater than 0.9, and the preset direction intersects with the first direction (Z).

16. The battery (100) according to any one of claims 4 to 15, wherein: The first wall (101) is also provided with an electrode terminal (13) spaced apart from the pressure relief mechanism (12), and the orthographic projection of the groove (103) on the first wall (101) covers the electrode terminal (13).

17. The battery (100) according to any one of claims 1 to 16, wherein: The heat insulation structure (30) is bonded to the second battery cell (10b).

18. The battery (100) according to claim 1 or 2, wherein: The heat insulation structure (30) is arranged on the first wall (101).

19. The battery (100) according to any one of claims 1 to 18, wherein: The first battery cell (10a) and the second battery cell (10b) are arranged along a first direction (Z); the second battery cell (10b) has a second wall (102) opposite to the first wall (101); and the first wall (101) and the second wall (102) are both perpendicular to the first direction (Z).

20. The battery (100) according to any one of claims 1 to 19, wherein: The area of ​​the first wall (101) is greater than the areas of other walls of the first housing (11a).

21. The battery (100) according to any one of claims 1 to 20, wherein: The thermal conductivity of the thermal insulation structure (30) is ≤0.7 W / m·K; and / or the melting point of the thermal insulation structure (30) is greater than 800°C.

22. The battery (100) according to any one of claims 1 to 21, wherein: The thermal insulation structure (30) is a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material piece, or a pre-oxidized silk aerogel piece.

23. An electrical device, wherein: Comprising a battery (100) according to any one of claims 1-22.

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