Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of batteries, the battery device comprises a box body, single batteries and a heat insulation plate, and a mounting part is arranged in the box body; the battery monomers are arranged in the box body, a shell of each battery monomer is provided with a pressure relief part, and the pressure relief parts are arranged towards the first direction; the heat insulation plate is connected to the mounting part and located between the pressure relief part and the corresponding inner wall of the box body, the heat insulation plate is configured to be provided with a first connecting position and a second connecting position which are arranged in the first direction, the heat insulation plate can be switched from the first connecting position to the second connecting position, and the second connecting position is far away from the pressure relief part compared with the first connecting position. According to the technical scheme provided by the invention, when the battery cells are subjected to thermal runaway, the thermal insulation plate is adjusted to the second connection position, so that the exhaust gap between the thermal insulation plate and the pressure relief part can be increased, the exhaust smoothness of high-temperature and high-pressure flue gas is favorably improved, and the condition of accumulation of particulate matters carried in the flue gas is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device and an electrical device. Background Art

[0002] In the power battery pack of new energy vehicles, in order to prevent the high-temperature and high-pressure flue gas ejected when the battery cell undergoes thermal runaway from directly acting on the box cover, a mica plate is usually provided between the box cover and the battery cell. The mica plate withstands high temperature and impact, delays the diffusion of high-temperature and high-pressure flue gas or flame to the box cover, and buys time for emergency treatment after thermal runaway.

[0003] However, due to the presence of the mica plate, the exhaust smoothness of the high-temperature and high-pressure flue gas is affected, and the particulate matter carried therein is prone to accumulate, resulting in a relatively high risk of high-voltage insulation failure of the power battery pack. Utility Model Content

[0004] The main objective of this application is to propose a battery device and an electrical device, aiming to improve the problem that the arrangement of the mica plate in the power battery pack affects the exhaust smoothness.

[0005] In a first aspect, the battery device proposed in this application includes:

[0006] A box body with an installation part provided inside;

[0007] A battery cell disposed in the box body, with a pressure relief part provided on the shell of the battery cell, and the pressure relief part is arranged towards a first direction; and,

[0008] A heat insulation plate connected to the installation part and located between the pressure relief part and the corresponding inner wall of the box body. The heat insulation plate is configured to have a first connection position and a second connection position arranged along the first direction, and can be switched from the first connection position to the second connection position;

[0009] Wherein, the distance between the heat insulation plate and the pressure relief part at the second connection position is greater than the distance between the heat insulation plate and the pressure relief part at the first connection position.

[0010] The technical solution provided by this application enables the heat insulation plate to remain at the first connection position when the battery cell is in a normal state. When the battery cell undergoes thermal runaway, the high-temperature and high-pressure flue gas ejects from the pressure relief part. By adjusting the entire heat insulation plate to the second connection position, the exhaust gap between the heat insulation plate and the pressure relief part can be increased, which helps to improve the exhaust smoothness of the high-temperature and high-pressure flue gas, improves the situation where the particulate matter carried in the flue gas is prone to accumulate. At the same time, the end of the heat insulation plate connected to the installation part can reach the second connection position along with the entire heat insulation plate, reducing the local stress borne by this end, improving the situation where it is prone to breakage, and reducing the risk of high-voltage insulation failure of the battery device.

[0011] In one embodiment, the heat insulation plate and the installation part are connected through a connection structure, and the connection structure includes a temperature-sensitive part. The connection structure is used to release the locking connection between the heat insulation plate and the installation part at the first connection position after the temperature-sensitive part is heated, so that the heat insulation plate can move away from the pressure relief part and switch from the first connection position to the second connection position.

[0012] In the above technical solution, when a thermal runaway occurs in the battery cell, the temperature inside the box rises sharply. Affected by the temperature, the temperature-sensitive part can release the locking connection between the heat insulation plate and the installation part at the first connection position, so that the heat insulation plate can disengage from the first connection position. Under the impact of the high-pressure flue gas ejected from the pressure relief part, the heat insulation plate can switch to the second connection position. This way of using a relatively simple temperature-sensitive structure to achieve the retention of the heat insulation plate at the first connection position and allowing the heat insulation plate to switch to the second connection position when a thermal runaway occurs in the battery cell ensures the timely switching of the position of the heat insulation plate, has high reliability, and at the same time controls the production cost of the battery device.

[0013] In one embodiment, the temperature-sensitive part includes a hot-melt colloid, wherein;

[0014] The hot-melt colloid can be heated and disconnected when subjected to a tensile force, and release the locking connection between the heat insulation plate and the installation part at the first connection position; or,

[0015] The hot-melt colloid can be heated and compressed when subjected to a pressure, and provide a moving space for the heat insulation plate along the first direction.

[0016] In the above technical solution, the heat insulation plate and the installation part are connected by the solid-state characteristics exhibited by the hot-melt colloid at normal temperature, which can keep the heat insulation plate at the first connection position before a thermal runaway occurs in the battery cell. At the same time, using the thermoplasticity exhibited by the hot-melt colloid at high temperature, the locking connection between the heat insulation plate and the installation part can be released. The hot-melt colloid has the advantages of simple structure, good connection effect at normal temperature, and automatic disconnection at high temperature.

[0017] In one embodiment, one of the heat insulation plate and the installation part includes a first base body, and the other includes a second base body;

[0018] The hot-melt colloid is arranged on the side of the first base body facing away from the second base body;

[0019] The connection structure further includes a connecting rod part, and the connecting rod part connects the second base body and the hot-melt colloid.

[0020] In the above technical solution, the hot-melt colloid is arranged on the side of the first base away from the second base, which can reduce the space occupied between the heat insulation plate and the installation part, that is, it can make the heat insulation plate closer to the battery cell at the first connection position, thereby reducing the overall volume of the battery device and improving the energy density of the battery device.

[0021] In an embodiment, the connecting rod portion has a first end and a second end arranged along the first direction, the second end is connected to the second base, the first end passes through the first base and protrudes laterally to form a first limiting portion, and the first limiting portion presses the hot-melt colloid in the first direction.

[0022] In the above technical solution, the hot-melt colloid is arranged between the first limiting portion and the first base. During the connection process, the connecting rod portion bears tensile force and applies pressure to the hot-melt colloid through the first limiting portion. The hot-melt colloid can melt when heated, so as to provide a space for the relative approaching movement of the first limiting portion and the first base, enabling the heat insulation plate to switch to the second connection position. Moreover, the setting of the first limiting portion also restricts the position switching of the heat insulation plate and can prevent the heat insulation plate from detaching from the connection with the installation part.

[0023] In an embodiment, a spring is arranged between the hot-melt colloid and the first limiting portion and / or between the hot-melt colloid and the first base, wherein the spring is arranged under pressure.

[0024] In the above technical solution, due to the spring being arranged under pressure, before the battery cell thermal runaway, the spring and the hot-melt colloid can jointly fill the space between the first limiting portion and the first base, thereby keeping the heat insulation plate at the first connection position. After the battery cell thermal runaway, during the process of the gradual melting of the hot-melt colloid, the spring gradually elongates, so as to provide a buffer for the relative approaching movement of the first base and the first limiting portion and prevent the first base and the first limiting portion from being damaged by hard contact.

[0025] In an embodiment, the temperature-sensitive portion includes two temperature-sensitive magnetic attraction portions that attract each other. The two temperature-sensitive magnetic attraction portions are respectively connected to the heat insulation plate and the installation part, and the magnetism of the temperature-sensitive magnetic attraction portion is negatively correlated with the temperature in the box body.

[0026] In the above technical solution, since the magnetism of the temperature-sensitive magnetic part is negatively correlated with the temperature inside the box, before thermal runaway, the temperature inside the box is relatively low. Since the two temperature-sensitive magnetic parts are respectively arranged on the heat-insulating plate and the installation part, the heat-insulating plate can be maintained at the first connection position through their effective magnetic attraction connection. After thermal runaway, the temperature inside the box rises sharply, and the magnetic attraction connection strength between the two temperature-sensitive magnetic parts weakens and is insufficient to resist the impact of high-pressure flue gas, so that the heat-insulating plate can be switched to the second connection position in time, ensuring the timely expansion of the exhaust gap between the heat-insulating plate and the pressure relief part.

[0027] In one embodiment, at least a part of the two temperature-sensitive magnetic parts overlaps in the second direction;

[0028] The first direction intersects with the second direction.

[0029] In the above technical solution, at least a part of the two temperature-sensitive magnetic parts overlaps in the second direction, that is, the two temperature-sensitive magnetic parts are magnetically connected in the second direction, thereby controlling the occupation of the internal space of the box in the first direction. The heat-insulating plate can be closer to the battery cell at the first connection position, thereby reducing the overall volume of the battery device and improving the energy density of the battery device.

[0030] In one embodiment, the two temperature-sensitive magnetic parts are respectively arranged as a magnetic ring and a magnetic column. The ring hole of the magnetic ring is arranged towards the first direction, and the magnetic column extends into the ring hole and is magnetically connected with the magnetic ring.

[0031] In the above technical solution, the two temperature-sensitive magnetic parts are arranged in a way that the magnetic column is inserted into the ring hole of the magnetic ring for magnetic connection, which can make full use of the circumferential side surface of the magnetic column. Under the same volume specification, the magnetic column and the magnetic ring can provide a relatively large magnetic connection strength, which is beneficial to stably maintaining the heat-insulating plate at the first connection position.

[0032] In one embodiment, the installation part is formed with a receiving groove opening towards the first direction, and the magnetic ring is embedded in the receiving groove.

[0033] In the above technical solution, forming a receiving groove on the installation part and embedding the magnetic ring in the receiving groove belongs to a hidden setting of the magnetic ring, which can reduce the occupation of the space in the first direction inside the box and further reduce the overall volume of the battery device.

[0034] In one embodiment, one of the heat-insulating plate and the installation part includes a first base body, and the other includes a second base body;

[0035] The connection structure further includes a connecting rod portion, the connecting rod portion having a first end and a second end arranged along the first direction, the second end being connected to the second base, the first end being arranged through the first base and protruding laterally to form a first limiting portion, the first limiting portion and the first base being spaced apart in the first direction, and the first limiting portion being in limiting contact with the first base at the second connection position;

[0036] Wherein, the magnetic ring is arranged on the first substrate, the connecting rod portion is passed through the ring hole of the magnetic ring, and the magnetic column is arranged on the connecting rod portion.

[0037] In the above technical solution, the first limiting portion and the first base are spaced apart in the first direction, providing a clearance space for the first limiting portion and the first base to move toward each other; after the thermal insulation board is separated from the first connection position, the first limiting portion can abut against the first base, thereby limiting the thermal insulation board to the second connection position, preventing the thermal insulation board from being separated from the installation portion; on this basis, the magnetic column uses the connecting rod portion as the installation basis, and utilizes the connecting rod portion to pass through the ring hole of the magnetic ring to achieve a magnetic connection with the magnetic ring; the magnetic column and the connecting rod portion are structurally integrated, reducing the space occupied by the connection structure in the box.

[0038] In one embodiment, one of the insulation board and the mounting portion includes a first substrate, and the other includes a second substrate;

[0039] The battery device further includes a connecting rod portion, the connecting rod portion having a first end and a second end arranged along the first direction, the second end being connected to the second base, the first end passing through the first base and protruding laterally to form a first limiting portion, the first limiting portion and the first base being spaced apart in the first direction;

[0040] At the second connection position, the first limiting portion is in limiting contact with the first base.

[0041] In the above technical solution, the first limiting portion and the first base are arranged at intervals in the first direction, which provides a movement space for the thermal insulation board to switch to the second connection position. The first limiting portion can also limit the first base and the second base from moving further away from each other, effectively preventing the thermal insulation board from being separated from the connection with the mounting portion, and increasing the connection reliability between the thermal insulation board and the mounting portion.

[0042] In one embodiment, the second end of the connecting rod portion is arranged through the second base body and protrudes laterally to form a second limiting portion, and the connecting rod portion is movably arranged relative to the first base body and the second base body;

[0043] At the second connection position, the first base body and the second base body are respectively limited and abutted against the first limiting portion and the second limiting portion.

[0044] In the above technical solution, the connecting rod portion is set to be movable relative to the first base body and the second base body, and combined with the setting of the second limiting portion, the fixed connection mode between the second end and the second base body is replaced, and the difficulty of arranging the connecting rod portion on the second base body is reduced.

[0045] In one embodiment, the battery device further includes an end plate, the end plate is disposed between the corresponding inner wall of the battery cell and the box body in the second direction, and the end plate includes the mounting portion;

[0046] The first direction intersects with the second direction.

[0047] In the above technical solution, the arrangement of the end plate in the battery device can, on the one hand, resist the expansion and deformation of the battery cell, and on the other hand, can also provide an installation basis for the heat insulation plate.

[0048] In a second aspect, the present application further provides an electrical device, and the electrical device includes the above battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0050] Figure 1 It is a schematic structural diagram of an embodiment in which the electrical device provided by the present application is a vehicle;

[0051] Figure 2 It is an exploded structural schematic diagram of an embodiment of the battery device provided by the present application;

[0052] Figure 3 It is a schematic structural diagram of a first embodiment of the connection manner between the heat insulation plate and the mounting portion in the battery device provided by the present application;

[0053] Figure 4 It is a schematic structural diagram of a second embodiment of the connection manner between the heat insulation plate and the mounting portion in the battery device provided by the present application.

[0054] Description of the reference numerals in the drawings:

[0055] 1000, vehicle;

[0056] 100, battery device; 200, controller; 300, motor;

[0057] 1. Heat insulation board; 2. Box body; 21. Box main body; 22. Box cover; 3. Battery cell; 31. Pressure relief part; 4. End plate; 4a. Installation part; 41. Accommodation groove; 5. Connection structure; 51. Temperature-sensitive part; 511. Temperature-sensitive magnetic part; 511a. Magnetic ring; 511b. Magnetic column; 512. Heat-melt colloid; 52. Connecting rod part; 521. First end; 521a. First limiting part; 522. Second end; 522a. Second limiting part; 53. Spring;

[0058] A. First substrate; B. Second substrate; X. First direction; Y. Second direction.

[0059] The realization of the purpose of this application, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0060] The embodiments of the technical solutions of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of this application more clearly, so they are only examples and cannot be used to limit the protection scope of this application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0063] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments of this application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0065] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying 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 to the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0067] In the power battery pack of a new energy vehicle, the pressure relief valve of the battery cell usually faces the cover of the battery box. In order to prevent the high-temperature and high-pressure flue gas ejected from the pressure relief valve of the battery cell from directly acting on the cover when the battery cell undergoes thermal runaway, a mica plate is usually provided between the cover and the battery cell. The mica plate withstands high temperature and impact, delays the diffusion of high-temperature and high-pressure flue gas or flame to the cover, and buys time for emergency treatment after thermal runaway.

[0068] In the current mica plate setting scheme, the mica plate needs to cover a plurality of battery cells arranged in columns, and its two ends are generally rigidly connected to the installation structure in the battery box through a threaded locking structure. When thermal runaway occurs, the middle part of the mica plate will arch towards the cover due to the impact of high-temperature and high-pressure flue gas, while the two ends of the mica plate cannot be lifted adaptively due to the rigid connection with the installation structure, thus restricting the exhaust smoothness at both ends of the mica plate. Particulates carried in the high-temperature and high-pressure flue gas are likely to accumulate at both ends of the mica plate, increasing the risk of high-voltage insulation failure of the power battery pack; moreover, since the mica plate is a rigid material, its middle part is arched by the impact, and the two ends are restricted by the threaded locking structure and cannot be lifted, which easily causes the mica plate to break at both ends, further increasing the risk of high-voltage insulation failure of the power battery pack.

[0069] Analysis shows that the rigid connection of the mica plate at both ends using a threaded locking structure leads to the above-mentioned problems. It can be considered to set the mica plate so that it can be adjusted as a whole in the direction away from the pressure relief valve of the battery cell. On the one hand, it can increase the space between the mica plate and the pressure relief valve when thermal runaway occurs, improving the exhaust smoothness of high-temperature and high-pressure flue gas. On the other hand, it can effectively improve the problem of fracture at the end of the mica plate.

[0070] The battery device disclosed in the embodiments of the present application can be used to provide electrical energy for electrical equipment. Among them, the electrical equipment can be, but is not limited to, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0071] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical equipment in an embodiment of the present application for illustration.

[0072] Please refer to Figure 1 , Figure 1 which is a structural schematic diagram of an embodiment where the electrical equipment provided by the present application is a vehicle. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for the power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0073] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0074] For ease of understanding the battery device provided by the present application, please refer to Figure 2 , Figure 2Schematic exploded view of an embodiment of the battery device provided by this application. The battery device 100 generally includes a box body 2 and battery cells 3. An installation cavity is formed inside the box body 2, and the battery cells 3 are loaded through the installation cavity. The basic structure of the box body 2 generally includes a box main body 21 and a box cover 22. The box cover 22 is arranged on the box main body 21 and jointly defines the installation cavity with the box main body 21. Generally speaking, the battery cells 3 are generally arranged in the box main body 21. After the battery device 100 is mounted on a vehicle, the box cover 22 is generally close to the vehicle, and the box main body 21 is generally away from the vehicle; the installation cavity can be mainly formed in the box main body 21. At this time, the box main body 21 can be understood as a basin-shaped structure, and the box cover 22 is covered on the box main body 21 to cover the installation cavity; the installation cavity can also be mainly formed in the box cover 22. At this time, the box cover 22 can be understood as a cover-shaped structure, and the box cover 22 covers the box main body 21 to cover the battery cells 3 mounted on the box main body 21 into the box cover 22. Of course, the structure of the box body 2 is not limited to this.

[0075] The number of battery cells 3 in the box body 2 can be one or multiple. Among them, when multiple battery cells 3 are provided, the multiple battery cells 3 can be connected in series, parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 3. The multiple battery cells 3 can be directly connected in series, parallel or in a mixed connection to form a battery assembly. Of course, the multiple battery cells 3 can also be in the form that the battery cells 3 are first connected in series, parallel or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, parallel or in a mixed connection to form a battery assembly. The battery device 100 can also include other structures, such as a busbar component, for realizing the electrical connection between multiple battery cells 3 or multiple battery modules. Among them, each battery cell 3 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 3 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0076] The structure of the battery cell 3 generally includes a housing, an electrode assembly and an electrode terminal. An accommodation cavity is usually formed inside the housing. The electrode assembly is installed in the accommodation cavity and led out to the outside of the housing through the electrode terminal arranged on the housing wall of the housing to be connected to the busbar component of the battery device; according to the different structural types of the battery cell 3, the specific type of the "housing" is generally divided into a square housing and a cylindrical housing. The housing generally includes a housing main body and an end cover. The end cover is covered on the housing main body to jointly enclose the accommodation cavity with the housing main body. The electrode terminal is usually arranged on the end cover so that after the electrode assembly and the end cover are integrally connected, they are put into the housing main body. The "electrode assembly" is usually composed of a positive electrode plate, a negative electrode plate and a separator. Among them, the lithium-ion electrode assembly mainly works by the reciprocating deintercalation and intercalation of lithium ions between the positive electrode plate and the negative electrode plate.

[0077] To address the above-mentioned technical problems, in the battery device provided in the present application, in addition to the box body 2 and the battery cells 3, a heat insulation plate is further included. To facilitate the understanding of the heat insulation plate provided in the present application and its connection method, the following description is provided in conjunction with the accompanying drawings. Among them, Figure 3 is a schematic structural diagram of a first embodiment of the connection method between the heat insulation plate and the mounting portion in the battery device provided in the present application (the heat insulation plate is in the first connection position); Figure 4 is a schematic structural diagram of a second embodiment of the connection method between the heat insulation plate and the mounting portion in the battery device provided in the present application (the heat insulation plate is in the first connection position).

[0078] Please refer to Figure 3 and Figure 4 , in an embodiment of the present application, the battery device 100 includes a box body 2, battery cells 3, and a heat insulation plate 1; an installation portion 4a is provided inside the box body 2; the battery cells 3 are arranged in the box body 2, and a pressure relief portion 31 is provided on the housing of the battery cells 3, and the pressure relief portion 31 is arranged toward the first direction X; the heat insulation plate 1 is connected to the installation portion 4a and is located between the pressure relief portion 31 and the corresponding inner wall of the box body 2. The heat insulation plate 1 is configured to have a first connection position and a second connection position arranged along the first direction X and be able to switch from the first connection position to the second connection position. Among them, the distance between the heat insulation plate 1 and the pressure relief portion 31 in the second connection position is greater than the distance between the heat insulation plate 1 and the pressure relief portion 31 in the first connection position.

[0079] It should be noted that the first direction X mentioned in the embodiments of the present application and the second direction Y mentioned in the following embodiments are relative to the battery device 100 itself and have no necessary association with the setting direction of the overall structure of the battery device 100.

[0080] The "installation portion 4a" refers to the component inside the box body 2 that provides an installation basis for the heat insulation plate 1. There can be many specific structural types. For example, the installation portion 4a can be a cross beam or a longitudinal beam in the box body 2 for enhancing rigidity and protection performance, or a partial installation area on the box cover 22. The specific structural type of the installation portion 4a is not limited in this embodiment.

[0081] The "pressure relief part 31" is arranged on the housing of the battery cell 3. Its function is that when a large amount of smoke is generated inside the housing of the battery cell 3 due to reasons such as thermal runaway, overcharge, and short circuit, the pressure relief part 31 will open when the preset pressure threshold is reached, releasing the internal pressure of the housing to prevent the housing from cracking or exploding due to excessive pressure. By releasing the high-temperature and high-pressure smoke timely and directionally, the pressure relief part 31 can delay the spread of thermal runaway between the battery cells 3. The pressure relief part 31 includes but is not limited to an explosion-proof valve, and there are many structural types, which are not limited in the embodiments of the present application. "The pressure relief part 31 is arranged facing the first direction X" can be understood as that when the battery cell 3 has a thermal runaway, the pressure relief part 31 opens, and can control the high-temperature and high-pressure smoke to spray out towards the first direction X; in one embodiment, the box body 2 includes a box main body 21 and a box cover 22, and the box cover 22 and the box main body 21 are arranged to be covered along the first direction X; the pressure relief part 31 is arranged facing the box cover 22.

[0082] The "heat insulation plate 1" is connected to the installation part 4a and is located between the pressure relief part 31 and the corresponding inner wall of the box body 2. The "corresponding inner wall of the box body 2" refers to the inner wall opposite to the pressure relief part 31 in the first direction X. The heat insulation plate 1 is located between the two, and its function is to withstand the impact of the high-temperature and high-pressure smoke ejected from the pressure relief part 31. The material of the heat insulation plate 1 can be mica, and of course it can also be other materials, as long as it has sufficient high-temperature resistance and impact resistance while meeting the basic requirements of insulation, which is not limited in this embodiment. The heat insulation plate 1 is generally in a plate-like structure, but it should not be limited to think that the heat insulation plate 1 belongs to a flat plate structure. The heat insulation plate 1 can also have certain concave or convex areas in its extended plane to increase its own rigidity and reduce the pressure on the battery cell 3.

[0083] The "thermal insulation plate 1" is configured to have a first connection position and a second connection position arranged along the first direction X, and can be switched from the first connection position to the second connection position. It should be understood that the thermal insulation plate 1 can be switched to the second connection position as a whole, rather than only a partial structure can be switched to the second connection position. With such a setting, the gap between the thermal insulation plate 1 and the pressure relief part 31 of the battery cell 3 can be opened as a whole, aiming to improve the exhaust smoothness when the battery cell 3 is in thermal runaway; the position switching of the thermal insulation plate 1 should be associated with the thermal runaway of the battery cell 3, that is, the thermal insulation plate 1 can at least be switched to the second connection position when the battery cell 3 has a thermal runaway. Specifically, it can be an active position switching. For example, the thermal insulation plate 1 realizes the position switching through the action of the position switching device. By setting a temperature sensor in the box body 2 to detect the temperature, the occurrence of thermal runaway in the battery cell 3 can be judged, and then the control device controls the position switching device to act, so as to actively switch the thermal insulation plate 1 to the second connection position; the thermal insulation plate 1 can also be a passive position switching. For example, the high-pressure flue gas ejected after the pressure relief part 31 of the battery cell 3 is opened impacts the thermal insulation plate, so as to push the thermal insulation plate to realize the position switching. In this embodiment, the position switching method of the thermal insulation plate 1 is not limited, and the structural features that may participate in the position switching are also not limited. It is worth mentioning that before the battery cell 3 has a thermal runaway, the thermal insulation plate 1 can at least remain in the first connection position, that is, when the vehicle loaded with this battery device 100 is driving (including bumpy driving conditions), the thermal insulation plate 1 will not break away from the first connection position.

[0084] In the technical solution provided by this application, when the battery cell 3 is in a normal state, the thermal insulation plate 1 can remain in the first connection position. When the battery cell 3 has a thermal runaway, the high-temperature and high-pressure flue gas is ejected from the pressure relief part 31. By adjusting the thermal insulation plate 1 as a whole to the second connection position, the exhaust gap between the thermal insulation plate 1 and the pressure relief part 31 can be increased, which helps to improve the exhaust smoothness of the high-temperature and high-pressure flue gas, and improves the situation that the particulate matter carried in the flue gas is easy to accumulate. At the same time, the end of the thermal insulation plate 1 connected to the installation part 4a can reach the second connection position as a whole with the thermal insulation plate 1, and the local stress borne by this end is reduced, and the situation that it is easy to break is also improved, reducing the risk of high-voltage insulation failure of the battery device 100.

[0085] In one embodiment, the thermal insulation plate 1 and the installation part 4a are connected through a connection structure 5. The connection structure 5 includes a temperature-sensitive part 51. The connection structure 5 is used to release the locking connection between the thermal insulation plate 1 and the installation part 4a at the first connection position after the temperature-sensitive part 51 is heated, so that the thermal insulation plate 1 can move away from the pressure relief part 31 and be switched from the first connection position to the second connection position.

[0086] It should be noted that the "temperature-sensitive portion 51" should be understood as having a temperature-sensitive property. The connection structure 5 uses this property of the temperature-sensitive portion 51 to realize the locking connection between the insulation board 1 and the mounting portion 4a at the first connection position, and to release the locking connection between the insulation board 1 and the mounting portion 4a at the first connection position; since the insulation board 1 and the mounting portion 4a are connected via the connection structure 5, the connection structure 5 usually has a corresponding connection path for the connection force to be transmitted, and the temperature-sensitive portion 51 should usually be understood as being on the connection path. For example, the temperature-sensitive portion 51 can be completely between the insulation board 1 and the mounting portion 4a. The temperature-sensitive portion 51 is subjected to tension on the connection path, and the connection structure 5 can be The insulation board 1 is maintained at the first connection position close to the pressure relief portion 31 by pulling, and the temperature-sensitive portion 51 can be disconnected after being heated, thereby allowing the insulation board 1 to be separated from the first connection position; for another example, the temperature-sensitive portion 51 can be located on the side of the insulation board 1 and the mounting portion 4a away from the other, and withstand pressure on the connection path, and the connection structure 5 can maintain the insulation board 1 at the first connection position close to the pressure relief portion 31 by clamping, and the temperature-sensitive portion 51 can disappear after being heated, thereby allowing the insulation board 1 to be separated from the first connection position and giving the insulation board 1 space to move to the second connection position; this embodiment does not limit the specific structural form of the temperature-sensitive portion 51.

[0087] In the above technical solution, the insulation board 1 and the mounting portion 4a are arranged to be connected through a connecting structure 5, and the connecting structure 5 includes a temperature-sensitive portion 51. Since the temperature-sensitive portion 51 has a temperature-sensitive characteristic, when the battery cell 3 has a thermal runaway, the temperature in the box body 2 rises sharply. Affected by the temperature, the temperature-sensitive portion 51 can release the locking connection between the insulation board 1 and the mounting portion 4a at the first connection position, so that the insulation board 1 can be separated from the first connection position. Under the impact of the high-pressure flue gas ejected from the pressure relief portion 31, the insulation board 1 can be switched to the second connection position. This method of maintaining the insulation board 1 at the first connection position with a relatively simple temperature-sensitive structure and allowing the insulation board 1 to switch to the second connection position when the battery cell 3 has a thermal runaway ensures that the position switching of the insulation board 1 is carried out in a timely manner, has high reliability, and controls the production cost of the battery device 100.

[0088] Specifically, see Figure 3 In one embodiment, the temperature-sensitive portion 51 includes two temperature-sensitive magnetic portions 511 that attract each other. The two temperature-sensitive magnetic portions 511 are respectively connected to the insulation board 1 and the mounting portion 4a. The magnetism of the temperature-sensitive magnetic portions 511 is negatively correlated with the temperature inside the box 2.

[0089] It should be noted that the mutual attraction between the two temperature-sensitive magnetic attraction parts 511 includes two implementation methods. In the first method, one of the two temperature-sensitive magnetic attraction parts 511 is a magnetic attraction part with magnetism, and the other is a material that can be magnetically adsorbed. In the second method, the two temperature-sensitive magnetic attraction parts 511 are respectively magnetic attraction parts with opposite polarities. Based on this, "the magnetism of the temperature-sensitive magnetic attraction part 511 is negatively correlated with the temperature inside the box body 2" means that the magnetism of the magnetic one among the two temperature-sensitive magnetic attraction parts 511 is negatively correlated with the temperature inside the box body 2, that is, its magnetism decreases as the temperature rises. The two temperature-sensitive magnetic attraction parts 511 are correspondingly connected to the heat insulation board 1 and the installation part 4a in ways including direct connection and indirect connection. For example, the two temperature-sensitive magnetic attraction parts 511 can be directly fixed on the heat insulation board 1 and the installation part 4a respectively and are located between the heat insulation board 1 and the installation part 4a. Another example is that the two temperature-sensitive magnetic attraction parts 511 can be arranged on one side of the heat insulation board 1 or the installation part 4a facing away from the other, and are indirectly connected to the heat insulation board 1 and the installation part 4a through a transfer structure.

[0090] In the above technical solution, since the magnetism of the temperature-sensitive magnetic attraction part 511 is negatively correlated with the temperature inside the box body 2, before thermal runaway, the temperature inside the box body 2 is relatively low. Since the two temperature-sensitive magnetic attraction parts 511 are respectively arranged on the heat insulation board 1 and the installation part 4a, the heat insulation board 1 can be maintained at the first connection position through their effective magnetic attraction connection. After thermal runaway, the temperature inside the box body 2 rises sharply, and the magnetic attraction connection strength between the two temperature-sensitive magnetic attraction parts 511 weakens and is not enough to resist the impact of high-pressure flue gas, so that the heat insulation board 1 can be switched to the second connection position in time, ensuring the timely expansion of the exhaust gap between the heat insulation board 1 and the pressure relief part 31.

[0091] Further, in an embodiment, the two temperature-sensitive magnetic attraction parts 511 are at least partially overlapped in the second direction Y; the first direction X and the second direction Y intersect.

[0092] "The first direction X and the second direction Y intersect" means that the included angle between the two directions can be any value between 0° and 180° in principle. However, usually, it is generally considered that the first direction X and the second direction Y are arranged at a 90° included angle. It is worth mentioning that the two temperature-sensitive magnetic attraction parts 511 are at least partially overlapped in the second direction Y. However, they can also be completely overlapped in the second direction Y (that is, in the second direction Y, the projection of one of the two temperature-sensitive magnetic attraction parts 511 completely falls into the projection of the other). No matter how much the two temperature-sensitive magnetic attraction parts 511 overlap in the second direction Y, it should be considered that the two temperature-sensitive magnetic attraction parts 511 are magnetically attracted in the second direction Y, and the space occupied in the first direction X is reduced.

[0093] In the above technical solution, at least a part of the two temperature-sensitive magnetic attraction parts 511 overlaps in the second direction Y, that is, the two temperature-sensitive magnetic attraction parts 511 are magnetically connected in the second direction Y, thereby controlling the occupation of the internal space of the box body 2 in the first direction X. The heat insulation plate 1 can be closer to the battery cell 3 at the first connection position, thereby reducing the overall volume of the battery device 100 and improving the energy density of the battery device 100.

[0094] Further, in an embodiment, the two temperature-sensitive magnetic attraction parts 511 are respectively arranged as a magnetic ring 511a and a magnetic column 511b. The ring hole of the magnetic ring 511a is arranged towards the first direction X, and the magnetic column 511b extends into the ring hole and is magnetically connected to the magnetic ring 511a.

[0095] It should be explained that since the magnetic ring 511a belongs to an annular structure, it naturally has a ring hole. The magnetic column 511b can extend into the ring hole and be magnetically connected to the magnetic ring 511a, that is, the inner wall of the ring hole of the magnetic ring 511a and the peripheral side wall of the magnetic column 511b are opposite-sex magnetic poles.

[0096] In the above technical solution, the two temperature-sensitive magnetic attraction parts 511 are arranged in a way that the magnetic column 511b is inserted into the ring hole of the magnetic ring 511a for magnetic connection, which can make full use of the peripheral side of the magnetic column 511b. Under the same volume specification, the magnetic column 511b and the magnetic ring 511a can provide a large magnetic connection strength, which is beneficial to stably maintaining the heat insulation plate 1 at the first connection position.

[0097] Furthermore, in an embodiment, the mounting part 4a is formed with a receiving groove 41 opening towards the first direction X, and the magnetic ring 511a is embedded in the receiving groove 41.

[0098] In the above technical solution, forming the receiving groove 41 on the mounting part 4a and embedding the magnetic ring 511a in the receiving groove 41 belongs to a hidden setting of the magnetic ring 511a, which can reduce the space occupation of the magnetic ring 511a in the first direction X inside the box body 2 and further reduce the overall volume of the battery device 100.

[0099] In another embodiment, one of the heat insulation plate 1 and the mounting part 4a includes a first base body A, and the other includes a second base body B; the connecting structure 5 further includes a connecting rod part 52. The connecting rod part 52 has a first end 521 and a second end 522 arranged along the first direction X. The second end 522 is connected to the second base body B. The first end 521 passes through the first base body A and protrudes laterally to form a first limiting part 521a. The first limiting part 521a and the first base body A are arranged at intervals in the first direction X. At the second connection position, the first limiting part 521a and the first base body A are in limiting abutment; wherein, the magnetic ring 511a is arranged on the first base body A, the connecting rod part 52 passes through the ring hole of the magnetic ring 511a, and the magnetic column 511b is arranged on the connecting rod part 52.

[0100] It should be noted that the focus of this embodiment is to introduce the beneficial effect of the setting of the connecting rod portion 52 on the position switching of the insulation board, and to use the connecting rod portion 52 to provide a connection basis for the magnetic column 511b, and focuses on the integration of specific structures. Therefore, this embodiment does not limit the specific ownership of the first substrate A and the second substrate B. It may be that the insulation board 1 includes the first substrate A and the mounting portion 4a includes the second substrate B, or it may be that the insulation board 1 includes the second substrate B and the mounting portion 4a includes the first substrate A. The connecting rod portion 52 in this embodiment should be understood as extending along the first direction X, and "the second end 522 is connected to the second substrate B" can be understood as that the second end 522 is fixedly connected to the second substrate B, or it can be understood as that the second end 522 and the second substrate B are movably limitedly connected in the first direction X. Regardless of which method is used, it should be ensured that when the insulation board 1 is in the first connection position, the second end 522 of the connecting rod portion 52 cannot move relative to the second substrate B close to the first substrate A, so as to ensure that the magnetic column 511b can continuously apply a connecting force toward the first substrate A to the second substrate B through the connecting rod portion 52, thereby maintaining the position of the insulation board 1.

[0101] “The first end 521 is arranged to pass through the first substrate A” should be understood as a hole that is formed on the first substrate A and passes through the hole along the first direction X, and the connecting rod portion 52 is inserted into the hole so that the first end 521 is located on the side of the first substrate A that is away from the second substrate B; in “the first end 521 protrudes laterally to form a first limiting portion 521a”, “lateral” refers to the lateral direction of the connecting rod portion 52, which can be any direction within a plane perpendicular to the first direction X. Due to the lateral protrusion of the first limiting portion 521a, the first limiting portion 521a coincides with the first substrate A in the projection of the first direction X, so that the first limiting portion 521a can be limitedly abutted against the first substrate A when the insulation board 1 is in the second connection position. There are many ways to "dispose the magnetic column 511b on the connecting rod portion 52". For example, the connecting rod portion 52 is divided into two parts, and the two end parts are respectively connected to the two ends of the magnetic column 511b along the first direction X. For another example, the connecting rod portion 52 passes through the magnetic column 511b. The embodiment of the present application does not limit this.

[0102] In the above technical solution, the first limiting portion 521a is spaced from the first base body A in the first direction X, providing a clearance space for the first limiting portion 521a and the first base body A to move closer to each other. After the heat insulation plate 1 disengages from the first connection position, the first limiting portion 521a can abut against the first base body A, thereby restricting the heat insulation plate 1 at the second connection position and preventing the heat insulation plate 1 from disengaging from the connection with the installation portion 4a. On this basis, the magnetic post 511b uses the connecting rod portion 52 as the installation base, and the connecting rod portion 52 is passed through the annular hole of the magnetic ring 511a to achieve magnetic attraction connection with the magnetic ring 511a. The magnetic post 511b and the connecting rod portion 52 are integrated in structure, reducing the occupation of the space inside the box body 2 by the connection structure 5.

[0103] Specifically, as Figure 3 shown, the installation portion 4a includes a first base body A, and the heat insulation plate 1 includes a second base body B, that is, the magnetic ring 511a is arranged on the installation portion 4a, and the magnetic post 511b is arranged by connecting the heat insulation plate 1 through the connecting rod portion 52.

[0104] Specifically, please refer to Figure 4 , in an embodiment, the temperature-sensitive portion 51 includes a heat-melt colloid 512. The heat-melt colloid 512 can be heated and disconnected when subjected to tensile force, and the locking connection between the heat insulation plate 1 and the installation portion 4a at the first connection position is released; or, the heat-melt colloid 512 can be heated and compressed when subjected to pressure, and provide a moving space for the heat insulation plate 1 in the first direction X.

[0105] It should be noted that the "hot melt colloid 512" has good connection strength and low plasticity at room temperature, and can transmit the connection force on the connection path of the connection structure 5, so as to keep the heat insulation plate 1 at the first connection position. The hot melt colloid 512 can melt at high temperature, its connection strength decreases, and its plasticity increases, and it can no longer transmit the connection force. The specific composition of the hot melt colloid 512 is not limited in this embodiment; the hot melt colloid 512 can be heated and disconnected when subjected to tensile force, so as to release the locking connection between the heat insulation plate 1 and the installation part 4a at the first connection position. For example, the heat insulation plate 1 and the installation part 4a are directly adhered together by the hot melt colloid 512, and the high-temperature and high-pressure flue gas ejected during the thermal runaway of the battery cell 3 can melt the hot melt colloid 512; the hot melt colloid 512 can be heated and compressed when subjected to pressure. Under the impact of the high-temperature and high-pressure flue gas ejected during the thermal runaway of the battery cell 3, the hot melt colloid 512 can provide a moving space for the heat insulation plate 1 along the first direction X through its own compression, so that it can switch to the second connection position. For example, the heat insulation plate 1 and the installation part 4a are connected by two mutually hooked locking structures, and the hot melt colloid 512 is arranged between the hooks of the two locking structures and bears the mutual extrusion of the two hooks. The high-temperature and high-pressure flue gas ejected during the thermal runaway of the battery cell 3 can melt the hot melt colloid 512, so that the two hooks can approach each other in the first direction X, that is, the heat insulation plate 1 and the installation part 4a are relatively far away from each other in the first direction X.

[0106] In the above technical solution, the heat insulation plate and the installation part 4a are connected by the solid-state characteristics exhibited by the hot melt colloid 512 at room temperature, and the heat insulation plate 1 can be kept at the first connection position before the thermal runaway of the battery cell 3. At the same time, by using the thermoplasticity exhibited by the hot melt colloid 512 at high temperature, the locking connection between the heat insulation plate 1 and the installation part 4a can be released. The hot melt colloid 512 has the advantages of simple structure, good connection effect at room temperature, and automatic disconnection at high temperature.

[0107] Further, in an embodiment, one of the heat insulation plate 1 and the installation part 4a includes a first base body A, and the other includes a second base body B; the hot melt colloid 512 is arranged on the side of the first base body A facing away from the second base body B; the connection structure 5 further includes a connecting rod part 52, and the connecting rod part 52 connects the second base body B and the hot melt colloid 512.

[0108] It should be noted that the focus of this embodiment is to define the better setting position of the hot-melt colloid 512, and it is not necessary to define the specific attribution of the first substrate A and the second substrate B. It may be that the heat insulation plate 1 includes the first substrate A and the installation part 4a includes the second substrate B, or the heat insulation plate 1 includes the second substrate B and the installation part 4a includes the first substrate A. It is worth mentioning that this embodiment still does not limit the force application mode of the hot-melt colloid 512. Although the connecting rod part 52 connects the second substrate B and the hot-melt colloid 512, the acting mode of the connecting rod part 52 on the hot-melt colloid 512 may be pulling (for example Figure 4 as shown, the hot-melt colloid 512 may be adhesively arranged on the side of the connecting rod part 52, so that the hot-melt colloid 512 bears tension), or it may be pressing.

[0109] In the above technical solution, setting the hot-melt colloid 512 on the side of the first substrate A facing away from the second substrate B can reduce the space occupied between the heat insulation plate 1 and the installation part 4a, that is, it can make the heat insulation plate 1 closer to the battery cell 3 at the first connection position, thereby reducing the overall volume of the battery device 100 and improving the energy density of the battery device 100.

[0110] Further, in an embodiment, the connecting rod part 52 has a first end 521 and a second end 522 arranged along the first direction X. The second end 522 is connected to the second substrate B. The first end 521 passes through the first substrate A and protrudes laterally to form a first limiting part 521a, and the first limiting part 521a presses the hot-melt colloid 512 in the first direction X.

[0111] The above embodiment has already explained the "connecting rod part 52", and this embodiment will not repeat it here. "The first limiting part 521a presses the hot-melt colloid 512 in the first direction X" includes that the first limiting part 521a directly contacts the hot-melt colloid 512, and the first limiting part 521a indirectly presses the hot-melt colloid 512 through other components.

[0112] In the above technical solution, the hot-melt colloid 512 is arranged between the first limiting part 521a and the first substrate A. The connecting rod part 52 bears tension during the connection process and applies pressure to the hot-melt colloid 512 through the first limiting part 521a. The hot-melt colloid 512 can melt after being heated, so as to provide a relatively close moving space for the first limiting part 521a and the first substrate A, enabling the heat insulation plate 1 to switch to the second connection position. Moreover, the setting of the first limiting part 521a also plays a role in restricting the position switching of the heat insulation plate 1, and can prevent the heat insulation plate 1 from detaching from the connection with the installation part 4a.

[0113] Further, in one embodiment, a spring 53 is disposed between the hot melt colloid 512 and the first limiting portion 521a and / or between the hot melt colloid 512 and the first base body A, wherein the spring 53 is disposed under compression.

[0114] For the above two parallel technical features, "a spring 53 is disposed between the hot melt colloid 512 and the first limiting portion 521a" and "a spring 53 is disposed between the hot melt colloid 512 and the first base body A", either one can be selected or both can be set simultaneously; the spring 53 being disposed under compression means that the spring 53 contracts under pressure during the setting process.

[0115] In the above technical solution, due to the spring 53 being disposed under compression, before the battery cell 3 undergoes thermal runaway, the spring 53 and the hot melt colloid 512 can jointly fill the space between the first limiting portion 521a and the first base body A, thereby maintaining the heat insulation plate 1 at the first connection position. After the battery cell 3 undergoes thermal runaway, during the process of the hot melt colloid 512 gradually melting, the spring 53 gradually elongates, thereby providing a buffer for the relative approaching movement between the first base body A and the first limiting portion 521a and preventing the first base body A and the first limiting portion 521a from being damaged by hard contact.

[0116] Please refer to Figure 3 and Figure 4 , in one embodiment, one of the heat insulation plate 1 and the mounting portion 4a includes the first base body A, and the other includes the second base body B; the battery device 100 further includes a connecting rod portion 52. The connecting rod portion 52 has a first end 521 and a second end 522 arranged along the first direction X. The second end 522 is connected to the second base body B. The first end 521 passes through the first base body A and protrudes laterally to form a first limiting portion 521a. The first limiting portion 521a and the first base body A are spaced apart in the first direction X; at the second connection position, the first limiting portion 521a and the first base body A are in limiting abutment.

[0117] It should be noted that the focus of this embodiment is to define the connecting rod portion 52 to provide a connection between the heat insulation plate 1 and the mounting portion 4a at the second connection position, and it is not necessary to define the specific attribution of the first base body A and the second base body B. It may be that the heat insulation plate 1 includes the first base body A and the mounting portion 4a includes the second base body B, or it may be that the heat insulation plate 1 includes the second base body B and the mounting portion 4a includes the first base body A. That is, the second end 522 of the connecting rod portion 52 can be connected to the heat insulation plate 1 or to the mounting portion 4a.

[0118] In the above technical solution, the first limit portion 521a and the first substrate A are arranged at intervals in the first direction X, which provides a movement space for the insulation board 1 to switch to the second connection position. The first limit portion 521a can also limit the first substrate A and the second substrate B from moving further away from each other, effectively preventing the insulation board 1 from being separated from the installation portion 4a, and increasing the connection reliability between the insulation board 1 and the installation portion 4a.

[0119] Furthermore, in one embodiment, the second end 522 of the connecting rod portion 52 passes through the second base body B and is formed with a second stopper 522a protruding laterally, and the connecting rod portion 52 is movably arranged relative to the first base body A and the second base body B;

[0120] At the second connection position, the first base body A and the second base body B are respectively limited and abutted against the first limiting portion 521 a and the second limiting portion 522 a .

[0121] “The second end 522 is arranged to pass through the second substrate B” should be understood as a hole that passes through the second substrate B along the first direction X, and the connecting rod portion 52 is inserted into the hole so that the second end 522 is located on the side of the second substrate B that is away from the first substrate A; in “the second end 522 protrudes laterally to form a second limiting portion 522a”, due to the lateral protrusion of the second limiting portion 522a, the second limiting portion 522a coincides with the second substrate B in the projection of the first direction X, so that the second limiting portion 522a can be limitedly abutted against the second substrate B when the insulation board 1 is in the second connection position; “the connecting rod portion 52 is movably arranged relative to the first substrate A and the second substrate B” means that the first end 521 and the second end 522 of the connecting rod portion 52 can both move relative to the first substrate A and the second substrate B along the first direction X.

[0122] In the above technical solution, the connecting rod portion 52 is arranged to be movable relative to the first substrate A and the second substrate B, and combined with the arrangement of the second limiting portion 522a, the fixed connection method between the second end 522 and the second substrate B is replaced, thereby reducing the difficulty of arranging the connecting rod portion 52 on the second substrate B.

[0123] In other embodiments, the connecting rod portion 52 cooperates with the temperature-sensitive portion 51 to maintain the thermal insulation board 1 at the first connection position. At this time, the second limiting portion 522a of the connecting rod portion 52 abuts against the second base B.

[0124] See also Figure 3 and Figure 4 In one embodiment, the battery device 100 further includes an end plate 4, which is disposed between the battery cell 3 and the corresponding inner wall of the box body 2 in the second direction Y, and includes a mounting portion 4a; the first direction X and the second direction Y are intersected.

[0125] In the above technical solution, on the one hand, the end plate 4 in the battery device 100 can resist the expansion and deformation of the battery cells 3, and on the other hand, it can also provide an installation basis for the heat insulation plate 1.

[0126] For multiple battery cells 3 arranged in a columnar stack, usually two end plates 4 are provided to abut against the head and tail ends of the multiple battery cells 3 respectively, so as to resist the thermal expansion of the battery cells 3 during charging and discharging. Based on this, in some embodiments, two sets of connection structures 5 are provided corresponding to the end plates 4, and are respectively connected to both ends of the heat insulation plate 1 along the second direction Y.

[0127] The present application also proposes an electrical device, which includes the battery device 100. The specific structure of the battery device 100 refers to the above embodiments. Since this electrical device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the battery device 100 is used to provide electrical energy for the electrical device. The electrical device includes, but is not limited to, new energy vehicles such as pure electric vehicles, hybrid vehicles, and range-extended vehicles, and may also include aircraft such as electric drones and electric passenger aircraft.

[0128] The present application provides a battery device 100, which includes a box body 2, battery cells 3, two end plates 4, a connection structure 5 and a heat insulation plate 1. The battery cells 3, the two end plates 4 and the heat insulation plate 1 are arranged inside the box body 2. A pressure relief portion 31 is provided on the housing of the battery cell 3, and the pressure relief portion 31 is arranged in the first direction X. The two end plates 4 are arranged on both sides of the battery cell 3 in the second direction Y between the corresponding side walls of the box body 2. The end plate 4 includes a mounting portion 4a. Both ends of the heat insulation plate 1 in the second direction Y are respectively connected to the corresponding mounting portions 4a through the connection structure 5. The connection structure 5 includes a connecting rod portion 52 and two temperature-sensitive magnetic attraction portions 511. The two temperature-sensitive magnetic attraction portions 511 include a magnetic ring 511a and a magnetic column 511b. The connecting rod portion 52 penetrates through the heat insulation plate 1 and the mounting portion 4a in the first direction X. The connecting rod portion 52 has a first end 521 and a second end 522 arranged in the first direction X. The first end 521 is located on the side of the heat insulation plate 1 away from the mounting portion 4a, and the second end 522 is located on the side of the mounting portion 4a away from the heat insulation plate 1. A first limiting portion 521a protrudes laterally from the first end 521 towards the connecting rod portion 52, and a second limiting portion 522a protrudes laterally from the second end 522 towards the connecting rod portion 52. The mounting portion 4a forms a receiving groove 41. The magnetic ring 511a is arranged in the receiving groove 41, and the ring hole of the magnetic ring 511a is arranged in the first direction X. The magnetic column 511b is arranged on the connecting rod portion 52 and extends into the ring hole of the magnetic ring 511a along with the connecting rod portion 52. The magnetic column 511b and the magnetic ring 511a attract each other to hold the heat insulation plate 1 in the first connection position where it abuts against the mounting portion 4a. In the first connection position, the heat insulation plate 1 abuts against the first limiting portion 521a. The magnetism of the magnetic ring 511a and the magnetic column 511b is negatively correlated with the temperature inside the box body 2. When the battery cell 3 is out of control due to heat, the magnetic attraction connection between the magnetic ring 511a and the magnetic column 511b weakens, and the heat insulation plate 1 can be switched from the first connection position to the second connection position away from the pressure relief portion 31. In the second connection position, the heat insulation plate 1 abuts against the first limiting portion 521a, and the second limiting portion 522a abuts against the mounting portion 4a.

[0129] The present application also provides a battery device 100, which includes a box body 2, battery cells 3, two end plates 4, a connection structure 5 and a heat insulation plate 1. The battery cells 3, the two end plates 4 and the heat insulation plate 1 are arranged inside the box body 2. A pressure relief portion 31 is provided on the housing of the battery cell 3, and the pressure relief portion 31 is arranged facing the first direction X. The two end plates 4 are arranged on both sides of the battery cell 3 in the second direction Y between the corresponding side walls of the box body 2. The end plate 4 includes a mounting portion 4a. Both ends of the heat insulation plate 1 in the second direction Y are respectively connected to the corresponding mounting portions 4a through the connection structure 5. The connection structure 5 includes a connecting rod portion 52, a hot melt colloid 512 and a spring 53. The connecting rod portion 52 passes through the heat insulation plate 1 and the mounting portion 4a along the first direction X. The connecting rod portion 52 has a first end 521 and a second end 522 arranged along the first direction X. The first end 521 is located on the side of the heat insulation plate 1 away from the mounting portion 4a, and the second end 522 is located on the side of the mounting portion 4a away from the heat insulation plate 1. A first limiting portion 521a protrudes laterally from the first end 521 towards the connecting rod portion 52, and a second limiting portion 522a protrudes laterally from the second end 522 towards the connecting rod portion 52. The first limiting portion 521a and the heat insulation plate 1 are arranged at an interval in the first direction X. The hot melt colloid 512 is arranged between the first limiting portion 521a and the heat insulation plate 1. A spring 53 is also arranged between the hot melt colloid 512 and the first limiting portion 521a. The second limiting portion 522a abuts against the mounting portion 4a, so that the spring 53 is compressed and the heat insulation plate 1 is maintained at the first connection position where it abuts against the mounting portion. When the battery cell 3 undergoes thermal runaway, the hot melt colloid 512 is heated and melted, the spring 53 returns to its extended state, and the heat insulation plate 1 can be switched from the first connection position to the second connection position away from the pressure relief portion 31. At the second connection position, the heat insulation plate 1 presses the spring 53, and the second limiting portion 522a abuts against the mounting portion 4a.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, wherein a mounting portion is arranged inside; A battery cell is disposed in the box, a pressure relief portion is disposed on the housing of the battery cell, and the pressure relief portion is disposed toward a first direction; and a thermal insulation board connected to the mounting portion and located between the pressure relief portion and a corresponding inner wall of the box body, the thermal insulation board being configured to have a first connection position and a second connection position arranged along a first direction, and being capable of switching from the first connection position to the second connection position; Wherein, the distance between the second connection position of the insulation board and the pressure relief portion is greater than the distance between the first connection position of the insulation board and the pressure relief portion.

2. The battery device according to claim 1, characterized in that: The thermal insulation plate is connected to the mounting portion via a connecting structure, which includes a temperature-sensitive portion. The connecting structure is used to release the locked connection between the thermal insulation plate and the mounting portion at the first connecting position after the temperature-sensitive portion is heated, so that the thermal insulation plate can move away from the pressure relief portion and switch from the first connecting position to the second connecting position.

3. The battery device according to claim 2, characterized in that: The temperature-sensitive portion includes a hot-melt colloid, wherein; The hot melt adhesive can be thermally disconnected when subjected to a tensile force, thereby releasing the locking connection between the insulation board and the mounting portion at the first connection position; or, The hot melt colloid can be compressed by heat when under pressure, and provides movement space for the insulation board along the first direction.

4. The battery device according to claim 3, characterized in that: One of the insulation board and the mounting portion includes a first substrate, and the other includes a second substrate; The hot melt adhesive is arranged on a side of the first substrate facing away from the second substrate; The connection structure further includes a connecting rod portion, and the connecting rod portion connects the second base body and the hot melt adhesive.

5. The battery device according to claim 4, characterized in that: The connecting rod portion has a first end and a second end arranged along the first direction, the second end is connected to the second base, the first end is arranged through the first base and protrudes laterally to form a first limiting portion, and the first limiting portion presses the hot melt adhesive in the first direction.

6. The battery device according to claim 5, characterized in that A spring is arranged between the hot melt adhesive and the first limiting portion and / or between the hot melt adhesive and the first substrate, wherein the spring is arranged to be under pressure.

7. The battery device according to claim 2, characterized in that: The temperature-sensitive part includes two temperature-sensitive magnetic parts that attract each other, the two temperature-sensitive magnetic parts are respectively connected to the temperature-isolating plate and the mounting part, and the magnetism of the temperature-sensitive magnetic parts is negatively correlated with the temperature inside the box.

8. The battery device according to claim 7, characterized in that: The two temperature-sensitive magnetic attraction parts are arranged to at least partially overlap in the second direction; The first direction is arranged to intersect with the second direction.

9. The battery device according to claim 8, characterized in that: The two temperature-sensitive magnetic parts are respectively arranged as a magnetic ring and a magnetic column. The ring hole of the magnetic ring is arranged toward the first direction. The magnetic column extends into the ring hole and is magnetically connected with the magnetic ring.

10. The battery device according to claim 9, characterized in that The mounting portion is formed with a receiving groove opening toward the first direction, and the magnetic ring is embedded in the receiving groove.

11. The battery device according to claim 9, characterized in that: One of the insulation board and the mounting portion includes a first substrate, and the other includes a second substrate; The connection structure further includes a connecting rod portion, the connecting rod portion having a first end and a second end arranged along the first direction, the second end being connected to the second base, the first end being arranged through the first base and protruding laterally to form a first limiting portion, the first limiting portion and the first base being spaced apart in the first direction, and the first limiting portion being in limiting contact with the first base at the second connection position; Wherein, the magnetic ring is arranged on the first substrate, the connecting rod portion is passed through the ring hole of the magnetic ring, and the magnetic column is arranged on the connecting rod portion.

12. The battery device according to any one of claims 1 to 10, characterized in that: One of the insulation board and the mounting portion includes a first substrate, and the other includes a second substrate; The battery device further includes a connecting rod portion, the connecting rod portion having a first end and a second end arranged along the first direction, the second end being connected to the second base, the first end passing through the first base and protruding laterally to form a first limiting portion, the first limiting portion and the first base being spaced apart in the first direction; At the second connection position, the first limiting portion is in limiting contact with the first base.

13. The battery device according to claim 12, characterized in that: The second end of the connecting rod portion is arranged through the second base body and protrudes laterally to form a second limiting portion, and the connecting rod portion is movably arranged relative to the first base body and the second base body; At the second connection position, the first base and the second base are respectively limited and abutted against the first limiting portion and the second limiting portion.

14. The battery device according to any one of claims 1 to 11, characterized in that: The battery device further includes an end plate, the end plate being disposed between the battery cell and a corresponding inner wall of the box body in the second direction, the end plate including the mounting portion; The first direction is arranged to intersect with the second direction.

15. An electrical equipment, characterized in that: Comprising the battery device according to any one of claims 1 to 14.

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