Battery apparatus and electrical device

Abstract

The present application provides a battery apparatus and an electrical device. The battery apparatus comprises at least one battery cell assembly, each battery cell assembly comprising a plurality of battery cells and a plurality of first fireproof plates. The plurality of battery cells are arranged in a first direction, each battery cell comprising a first wall and a pressure relief mechanism arranged on the first wall. The plurality of first fireproof plates are arranged in the first direction and are arranged in one-to-one correspondence with the plurality of battery cells. The plurality of first fireproof plates are independent of each other, and the plurality of first fireproof plates are respectively stacked on the first walls of the plurality of battery cells, covering the pressure relief mechanisms. When high-temperature gas is ejected from an explosion-proof valve due to thermal runaway of a certain battery cell, because the first fireproof plates are independent of each other, other surrounding first fireproof plates are not easily blown around by the high-temperature gas, and can still have an effective protective effect, thereby reducing the possibility of causing thermal runaway of other battery cells, and improving the safety and reliability of the entire battery apparatus.

Description

Battery devices and electrical equipment Cross-referencing

[0001] This application incorporates Chinese Patent Application No. 202411976251.3, filed on December 30, 2024, entitled “Battery Device and Electrical Equipment”, which is incorporated herein by reference in its entirety. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery device and an electrical appliance. Background Technology

[0003] Currently, electric vehicles have become the mainstream trend in the automotive industry. Electric vehicles have battery packs installed in their bodies, and these packs contain multiple individual cells. If one cell experiences thermal runaway, the high-temperature substances generated can easily be transferred to other cells, triggering a chain reaction and causing the thermal runaway to spread, thus increasing the risk. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device and electrical equipment that can reduce the possibility of thermal runaway chain reaction and improve the safety and reliability of the entire battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, including at least one battery cell assembly. Each battery cell assembly includes multiple battery cells and multiple first fireproof plates. The multiple battery cells are arranged along a first direction. Each battery cell includes a first wall and a pressure relief mechanism disposed on the first wall. The multiple first fireproof plates are arranged along the first direction and are disposed in one-to-one correspondence with the multiple battery cells. The multiple first fireproof plates are independent of each other and are respectively stacked on the first wall of the multiple battery cells, covering the pressure relief mechanism.

[0006] The battery device provided in this application embodiment has a first fireproof plate stacked on the first wall of each battery cell. Each first fireproof plate is independent of the others. When a battery cell experiences thermal runaway, causing the explosion-proof valve to release high-temperature gas, the other first fireproof plates around it are not easily blown away by the high-temperature gas because each first fireproof plate is independent of the others. This still provides effective protection, thereby reducing the possibility of causing thermal runaway in other battery cells and improving the safety and reliability of the entire battery device.

[0007] In some embodiments, the first fireproof plate includes a first plate and a second plate connected to each other. The second plate is disposed corresponding to the pressure relief mechanism and is configured to disconnect from the first plate when the pressure relief mechanism ruptures. This configuration facilitates control over the ejection of high-temperature substances generated by the pressure relief mechanism through the area where the second plate is located, reducing the likelihood of these substances being ejected towards the valves of adjacent battery cells, thereby reducing the possibility of high-temperature substances generated by the pressure relief mechanism's valves falling between two adjacent battery cells.

[0008] In some embodiments, the first fireproof board further includes connecting ribs, and the periphery of the second board is spaced apart from the first board. The second board is connected to the first board via the connecting ribs. The connection of the second board to the first board via the connecting ribs facilitates the second board being easily opened when the pressure relief mechanism is activated, thereby controlling the high-temperature material generated by the pressure relief mechanism from being ejected through the area where the second board is located.

[0009] In some embodiments, the thickness of the second plate is less than the thickness of the first plate. This thinner thickness allows the second plate to be easily opened during the pressure relief mechanism's spray valve operation, thereby controlling the ejection of high-temperature substances generated by the pressure relief mechanism through the area containing the second plate.

[0010] In some embodiments, the battery cell further includes electrode terminals disposed on the first wall, and the first fireproof plate has a first clearance hole through which the electrode terminals pass. The electrode terminals passing through the first clearance hole can, to a certain extent, limit the position of the first fireproof plate, facilitating the alignment and assembly of the first fireproof plate on the battery cell. Simultaneously, the electrode terminals of the battery cell can be exposed through the first fireproof plate, facilitating electrical connection between the busbar and the electrode terminals.

[0011] In some embodiments, the battery device further includes a temperature sampling element, which is thermally connected to the first wall of the battery cell to collect the temperature of the battery cell. The first fireproof plate is provided with a second clearance hole for avoiding the temperature sampling element. The second clearance hole allows the temperature sampling element to directly contact the first wall of the battery cell for sampling, improving the accuracy of the sampled temperature.

[0012] In some embodiments, the battery device further includes at least one second fireproof plate, which is disposed in a one-to-one correspondence with at least one battery cell assembly. Each second fireproof plate is stacked on the side of each first fireproof plate in the corresponding battery cell assembly that faces away from the first wall. The second fireproof plate, stacked on top of the entire battery cell assembly, further provides protection, reducing the likelihood of high-temperature substances generated after thermal runaway falling between adjacent battery cells, thereby reducing the possibility of heat propagation from the sides of the battery cells.

[0013] In some embodiments, the heat resistance temperature of the first fireproof board is greater than or equal to 400°C.

[0014] Therefore, the first fireproof board is not easily melted by high-temperature substances and can play an effective role in heat insulation and flame retardancy.

[0015] In some embodiments, the heat resistance temperature of the second fireproof board is greater than or equal to 400°C.

[0016] Therefore, the second fireproof board is not easily melted by high-temperature substances, and can play an effective role in heat insulation and flame retardancy.

[0017] In some embodiments, the first fireproof board is a mica sheet. The mica sheet has good flame-retardant and high-temperature resistance properties, can withstand high-temperature erosion, provides effective protection, and can also insulate against the battery cells.

[0018] In some embodiments, the second fireproof board is a mica sheet. The mica sheet has good flame-retardant and high-temperature resistance properties, can withstand high-temperature erosion, provides effective protection, and can also insulate against the battery cells.

[0019] In some embodiments, the second fireproof plate is provided with multiple pressure relief mechanism avoidance holes, each corresponding to a pressure relief mechanism of a plurality of battery cells. The pressure relief mechanism avoidance holes are used to avoid obstructing the pressure relief mechanism, thereby reducing the possibility of the second fireproof plate being blown up and further reducing the possibility of high-temperature substances generated by the pressure relief mechanism's spray valve falling between two adjacent battery cells.

[0020] In some embodiments, the battery cell further includes electrode terminals disposed on the first wall, and the second fireproof plate has a third clearance hole through which the electrode terminals pass. The electrode terminals passing through the third clearance hole can, to some extent, limit the positioning of the second fireproof plate, facilitating the alignment and assembly of the second fireproof plate on the battery cell. Simultaneously, the electrode terminals of the battery cell can be exposed through the second fireproof plate, facilitating electrical connection between the busbar and the electrode terminals.

[0021] In some embodiments, the battery device further includes a temperature sampling element, which is thermally connected to the first wall of the battery cell to collect the temperature of the battery cell. The second fireproof plate is provided with a fourth clearance hole for avoiding the temperature sampling element. The fourth clearance hole allows the temperature sampling element to directly contact the first wall of the battery cell for sampling, improving the accuracy of the sampled temperature.

[0022] In some embodiments, the battery cell assembly further includes a thermal insulation pad, with a thermal insulation pad disposed between each pair of adjacent battery cells. The thermal insulation pad provides protection between adjacent battery cells, reducing the possibility of thermal runaway propagation from the sides of the battery cells.

[0023] Secondly, embodiments of this application provide an electrical device, including a battery device as described in the first aspect, the battery device being used to provide electrical energy.

[0024] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort:

[0026] Figure 1 is a schematic diagram of the structure of a vehicle disclosed in an embodiment of this application;

[0027] Figure 2 is a schematic diagram of the exploded structure of a battery device disclosed in an embodiment of this application;

[0028] Figure 3 is a schematic diagram of the structure of a single battery cell disclosed in an embodiment of this application;

[0029] Figure 4 is an exploded view of a battery cell assembly disclosed in an embodiment of this application;

[0030] Figure 5 is a schematic diagram of the structure of a battery cell and a first fireproof plate disclosed in an embodiment of this application;

[0031] Figure 6 is a structural schematic diagram of the second fireproof board disclosed in an embodiment of this application;

[0032] The accompanying drawings are not drawn to scale.

[0033] Marker explanation:

[0034] 1000 vehicles;

[0035] Battery unit 100, vehicle body 200;

[0036] The enclosure is 300, the first part is 310, and the second part is 320;

[0037] Battery cell assembly 400, battery cell 500, end cap 510, outer shell 520, electrode terminal 530, pressure relief mechanism 540, first wall 550, first fireproof plate 600, first clearance hole 610, second clearance hole 620, first plate 630, second plate 640, connecting rib 650, second fireproof plate 700, pressure relief mechanism clearance hole 710, third clearance hole 730, fourth clearance hole 740, heat insulation pad 800;

[0038] First direction X, second direction Y. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0041] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0042] In the description of this application, the term "multiple" means two or more (including two).

[0043] In the description of this application, the technical terms "thickness", "bottom", "side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Electric vehicles have battery packs installed on the vehicle body. The battery pack has multiple battery cells. When one battery cell experiences thermal runaway, it is easy for the high-temperature substances generated by the thermal runaway to be transferred to another battery cell, triggering a chain reaction and causing the thermal runaway to spread, thereby increasing the risk.

[0046] Multiple battery cells can be combined to form a battery cell assembly. Related technologies use battery cell assemblies as units, covering them with fireproof plates for protection. However, when a battery cell experiences thermal runaway, causing the pressure relief mechanism to release high-temperature gases, the fireproof plate can easily be blown off, leading to the failure of protection over other battery cells and making it impossible to effectively control the spread of thermal runaway.

[0047] Based on the above considerations, this application provides a battery device including at least one battery cell assembly. Each battery cell assembly includes multiple battery cells and multiple first fireproof plates. The multiple battery cells are arranged along a first direction. Each battery cell includes a first wall and a pressure relief mechanism disposed on the first wall. The multiple first fireproof plates are arranged along the first direction and are disposed in one-to-one correspondence with the multiple battery cells. The multiple first fireproof plates are independent of each other and are respectively stacked on the first wall of the multiple battery cells, covering the pressure relief mechanism.

[0048] In this embodiment, a first fireproof plate is stacked on the first wall of each battery cell. Each first fireproof plate is independent of the others. When a battery cell experiences thermal runaway, causing the pressure relief mechanism to eject high-temperature gas, the other first fireproof plates around it are not easily blown away by the high-temperature gas because each first fireproof plate is independent of the others. This still provides effective protection, thereby reducing the possibility of other battery cells experiencing thermal runaway and improving the safety and reliability of the entire battery device.

[0049] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0050] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0051] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0052] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0053] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0054] The battery device and electrical equipment disclosed in this application can be used in electrical equipment that uses the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0055] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0056] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. The vehicle 1000 includes a battery device 100 and a vehicle body 200, with the battery device 100 disposed on the vehicle body 200. The battery device 100 can be disposed at the bottom, front, or rear of the vehicle body 200. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0057] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0058] Please refer to Figure 2, which is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 300 and at least one battery cell assembly 400. The housing 300 may include a first portion 310 and a second portion 320, which overlap each other to accommodate the battery cell assembly 400. The first portion 310 may be a hollow structure with an opening on one side, and the second portion 320 may be a plate-like structure, covering the opening side of the first portion 310. Alternatively, both the first portion 310 and the second portion 320 may be hollow structures with openings on one side, with the opening side of the second portion 320 covering the opening side of the first portion 310. Of course, the housing formed by the first portion 310 and the second portion 320 may be of various shapes, such as a cylinder, a cuboid, etc.

[0059] Within the housing 300, each battery cell assembly 400 may include multiple battery cells 500 arranged in an array. The multiple battery cells 500 can be connected in series, parallel, or a combination thereof; a combination thereof means that some of the multiple battery cells 500 are connected in series and others in parallel. The multiple battery cells 500 can be directly connected in series, parallel, or a combination thereof, and then the battery cell assembly 400 formed by the multiple battery cells 500 is housed within the housing 300. Alternatively, the battery device 100 may also consist of multiple battery cells 500 first connected in series, parallel, or a combination thereof to form a battery cell assembly 400, and then the multiple battery cell assemblies 400 are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 300. The battery device 100 may also include other structures; for example, the battery device 100 may also include a busbar component for realizing electrical connections between the multiple battery cells 500.

[0060] Each battery cell 500 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0061] Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell 500 provided in some embodiments of this application. The battery cell 500 refers to the smallest unit that makes up the battery device 100. The battery cell 500 includes an end cap 510, a housing 520, an electrode assembly, and other functional components.

[0062] The outer casing 520 is a hollow structure with an opening on one side. The end cap 510 is a component that covers the opening of the outer casing 520 to isolate the internal environment of the battery cell 500 from the external environment. Indiscriminately, the shape of the end cap 510 can be adapted to the shape of the outer casing 520 to fit it. In some embodiments, the end cap 510 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 510 is less prone to deformation under pressure and impact, enabling the battery cell 500 to have higher structural strength and improved safety performance.

[0063] The end cap 510 is provided with electrode terminals 530, which can be used to electrically connect with electrode assemblies for outputting or inputting electrical energy into the battery cell 500. In some embodiments, the end cap 510 may also be provided with a pressure relief mechanism 540 for releasing internal pressure when the internal pressure or temperature of the battery cell 500 reaches a threshold.

[0064] As an example, the internal pressure or temperature of the battery cell 500 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 500 reaches the predetermined threshold, the pressure relief mechanism 540 is activated or a weak structure in the pressure relief mechanism 540 is broken, thereby forming an opening or channel for the release of internal pressure or temperature. The threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 500.

[0065] As an example, the pressure relief mechanism 540 can be integrally formed with the end cap 510. For example, grooves can be made on the end cap 510 to form a weak structure, which serves as the pressure relief mechanism 540.

[0066] The pressure relief mechanism 540 can also be separately disposed from and connected to the housing 520, for example, by welding it to the end cap 510 or by connecting it through other components. As an example, the pressure relief mechanism 540 is provided with grooves to form a weak structure.

[0067] As an example, the pressure relief mechanism 540 can take the form of an explosion-proof valve, a balancing valve, a pneumatic valve, a pressure relief valve, or a safety valve.

[0068] The term "actuation" as used in this application refers to the pressure relief mechanism 540 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 500. The actions of the pressure relief mechanism 540 may include, but are not limited to: movement of components within the pressure relief mechanism 540 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 540, etc. When the pressure relief mechanism 540 is actuated, the high-temperature, high-pressure substances inside the battery cell 500 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 500 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0069] The emissions from the battery cell 500 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0070] The outer casing 520 is a component used to cooperate with the end cap 510 to form the internal environment of the battery cell 500. This internal environment can accommodate electrode components, insulating film, electrolyte, and other components. The outer casing 520 and the end cap 510 can be independent components. An opening can be provided on the outer casing 520, and the end cap 510 closes the opening to form the internal environment of the battery cell 500. Alternatively, the end cap 510 and the outer casing 520 can be integrated. Specifically, the end cap 510 and the outer casing 520 can form a common connecting surface before other components are inserted into the casing. When it is necessary to encapsulate the interior of the outer casing 520, the end cap 510 closes the outer casing 520. The outer casing 520 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer casing 520 can be determined according to the specific shape and size of the electrode components. The material of the outer casing 520 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0071] The electrode assembly is the component in the battery cell 500 where electrochemical reactions occur. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or at opposite ends. During the charging and discharging process of the battery cell 500, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 530 to form a current loop.

[0072] Figure 4 is an exploded view of a battery cell assembly provided in some embodiments of this application, and Figure 5 is a structural schematic diagram of a battery cell and a first fireproof plate provided in an embodiment of this application. Referring to Figures 2, 4 and 5, the battery device 100 includes at least one battery cell assembly 400. Each battery cell assembly 400 includes multiple battery cells 500 and multiple first fireproof plates 600. The multiple battery cells 500 are arranged along a first direction X. Each battery cell 500 includes a first wall 550 and a pressure relief mechanism 540 disposed on the first wall 550. The multiple first fireproof plates 600 are arranged along the first direction X and are disposed in one-to-one correspondence with the multiple battery cells 500. The multiple first fireproof plates 600 are independent of each other and are respectively stacked on the first wall 550 of the multiple battery cells 500 and cover the pressure relief mechanism 540.

[0073] The battery device 100 may include one or more battery cell assemblies 400, and the multiple battery cell assemblies 400 may be arranged in an array along a first direction X and a second direction Y, wherein the second direction Y is perpendicular to the first direction X.

[0074] The first wall 550 of the battery cell 500 can be the end cap 510 mentioned above, or it can be one or more walls of the outer casing 520. For example, the first wall 550 can also be a wall of the outer casing 520 opposite to the end cap 510. The first fireproof plate 600 is stacked on the first wall 550 of the battery cell 500. This can mean that the first fireproof plate 600 is attached to the first wall 550 of the battery cell 500 by gravity, or that the first fireproof plate 600 is glued to the first wall 550 of the battery cell 500 by adhesive.

[0075] The first fireproof plate 600 is a plate-shaped structure made of high-temperature resistant non-metallic material. The number of first fireproof plates 600 is the same as the number of battery cells 500 in the battery cell assembly 400. A first fireproof plate 600 is attached to the first wall 550 of each battery cell 500 in the battery cell assembly 400. The external dimensions of the first fireproof plate 600 are approximately the same as those of the first wall 550. The first fireproof plate 600 covers the pressure relief mechanism 540 on the first wall 550 while also concealing it. For example, both the first fireproof plate 600 and the first wall 550 are elongated rectangular structures. Each first fireproof plate 600 is independent of the others, meaning that each first fireproof plate 600 is spaced apart from the others in the first direction X.

[0076] The battery device 100 stacks a first fireproof plate 600 on the first wall 550 of each battery cell 500. Each first fireproof plate 600 is independent of the others. When a battery cell 500 experiences thermal runaway, causing the pressure relief mechanism 540 to eject high-temperature gas, the surrounding first fireproof plates 600 are not easily blown away by the high-temperature gas because each first fireproof plate 600 is independent of the others. This still provides effective protection, reducing the possibility of thermal runaway in other battery cells 500, improving the safety and reliability of the battery cell assembly 400, and thus improving the safety and reliability of the entire battery device 100.

[0077] In some embodiments, the battery cell 500 further includes an electrode terminal 530 disposed on the first wall 550, and the first fireproof plate 600 is provided with a first clearance hole 610, through which the electrode terminal 530 passes.

[0078] The shape of the first clearance hole 610 is adapted to the electrode terminal 530. For example, if the cross-section of the electrode terminal 530 is square, the first clearance hole 610 is a square hole.

[0079] The electrode terminal 530 of the battery cell 500 protrudes from the first wall 550. After the first fireproof plate 600 is stacked on the battery cell 500, the electrode terminal 530 passes through the first clearance hole 610, which can, to a certain extent, limit the positioning of the first fireproof plate 600 and facilitate the alignment and assembly of the first fireproof plate 600 on the battery cell 500. At the same time, the electrode terminal 530 can be exposed through the first clearance hole 610, which facilitates the electrical connection between the bus component and the electrode terminal 530.

[0080] In some other embodiments, two spaced-apart electrode terminals 530 are provided on the first wall 550 of the battery cell 500, and a pressure relief mechanism 540 is located between the two electrode terminals 530. The size of the first fireproof plate 600 in the direction in which the two electrode terminals 530 are arranged is smaller than the distance between the two electrode terminals 530, so that the first fireproof plate 600 can be disposed between the two electrode terminals 530 to cover the pressure relief mechanism 540 without obstructing the electrode terminals 530. Thus, the first fireproof plate 600 does not need to have a first clearance hole 610.

[0081] In some embodiments, the battery device 100 further includes a temperature sampling element (not shown), which is thermally connected to the first wall 550 of the battery cell 500 to collect the temperature of the battery cell 500. The first fireproof plate 600 is provided with a second clearance hole 620 for avoiding the temperature sampling element.

[0082] The temperature sampling element can be a thermistor. The area of ​​the second clearance hole 620 can be larger than the area of ​​the temperature sampling element, so that the temperature sampling element can pass through the second clearance hole 620 and completely fit against the first wall 550 of the battery cell 500. For example, the second clearance hole 620 can be a square hole, a circular hole, etc. The number of second clearance holes 620 is determined according to the number of temperature sampling elements. For example, if one temperature sampling element is attached to the first wall 550 of each battery cell 500, then the number of second clearance holes 620 on the first fireproof plate 600 is one.

[0083] The second clearance hole 620 is used to avoid the temperature sampling component, so that the temperature sampling component can contact the first wall 550 of the battery cell 500 for sampling, thereby improving the accuracy of the sampled temperature.

[0084] In some embodiments, the first fireproof board 600 includes a first plate body 630 and a second plate body 640 connected to each other. The second plate body 640 is disposed corresponding to the pressure relief mechanism 540 and is configured to disconnect from the first plate body 630 when the pressure relief mechanism 540 ruptures.

[0085] The first plate 630 can cover the area of ​​the first wall 550 except for the pressure relief mechanism 540. The first clearance hole 610 and the second clearance hole 620 are respectively provided on the first plate 630. The shape of the second plate 640 can be the same as that of the pressure relief mechanism 540. For example, both the second plate 640 and the pressure relief mechanism 540 are oblong holes. The second plate 640 is constructed to disconnect from the first plate 630 when the pressure relief mechanism 540 ruptures. That is, the second plate 640 is designed to be easily blown away by the high-temperature material ejected by the pressure relief mechanism 540 when it erupts, thereby detaching from the first plate 630.

[0086] The second plate 640 is configured to disconnect from the first plate 630 when the pressure relief mechanism 540 breaks, which facilitates the control of the high-temperature material generated by the pressure relief mechanism 540 to be ejected through the area where the second plate 640 is located. This reduces the possibility of the material being ejected toward the valve of the adjacent battery cell 500, thereby reducing the possibility of the high-temperature material generated by the valve of the pressure relief mechanism 540 falling between two adjacent battery cells 500, and further reducing the possibility of heat spread from the side of the battery cell 500.

[0087] In some embodiments, the first fireproof board 600 further includes a connecting rib 650, the periphery of the second board 640 is spaced apart from the first board 630, and the second board 640 is connected to the first board 630 by the connecting rib 650.

[0088] The width of the connecting rib 650 is much smaller than the perimeter of the second plate 640. Multiple connecting ribs 650 can be arranged at intervals along the circumference of the second plate 640. The first plate 630, the second plate 640, and the connecting ribs 650 can be integrally stamped, making manufacturing convenient and quick.

[0089] The second plate 640 is connected to the first plate 630 by a connecting rib 650, which makes the second plate 640 easy to be opened when the pressure relief mechanism 540 is ejected, thereby controlling the high temperature material generated by the pressure relief mechanism 540 to be ejected through the area where the second plate 640 is located, reducing the possibility that the high temperature material generated by the pressure relief mechanism 540 spray valve falls between two adjacent battery cells 500.

[0090] In some embodiments, the thickness of the second plate 640 is less than the thickness of the first plate 630.

[0091] The thickness of the second plate 640 can be the same everywhere, and the thickness of the second plate 640 can be less than the thickness of the first plate 630. This means that the thickness of the second plate 640 is less than the thickness of the first plate 630 everywhere. For example, the surface of the second plate 640 facing the first wall 550 is recessed compared to the surface of the first plate 630 facing the second fireproof plate 700, thus reducing the thickness of the second plate 640.

[0092] The thickness of the second plate 640 is less than that of the first plate 630, making the second plate 640 easier to be pushed open during the ejection process of the pressure relief mechanism 540. This controls the high-temperature material generated by the pressure relief mechanism 540 to be ejected through the area where the second plate 640 is located, reducing the possibility that the high-temperature material generated by the ejection valve of the pressure relief mechanism 540 will fall between two adjacent battery cells 500.

[0093] In some embodiments, the heat resistance temperature of the first fireproof board 600 is greater than or equal to 400°C, where heat resistance temperature refers to the temperature at which the material begins to significantly reduce its mechanical strength.

[0094] In this way, the first fireproof plate 600 is not easily melted by the high-temperature substances ejected from the battery cell 500 during thermal runaway, and can play an effective role in heat insulation and flame retardancy.

[0095] For example, the heat resistance temperature of the first fireproof board 600 can be 400℃, 500℃, 700℃, 1000℃, or 1500℃, etc. In some other embodiments, the heat resistance temperature of the first fireproof board 600 is greater than or equal to 800℃.

[0096] In some embodiments, the first fireproof board 600 is a mica sheet. The mica sheet is usually composed of polysilicon muscovite, quartz, garnet and rutile, etc., and has a heat resistance temperature range of approximately 500℃ to 1500℃. It has good flame retardant properties, high temperature resistance and insulation function, can withstand high temperature corrosion, play an effective protective role, and can maintain mutual insulation with the battery cell 500.

[0097] In some embodiments, the first fireproof board 600 may also be a polyimide film (PI film). Polyimide film is an ideal high-temperature resistant insulating material with excellent high-temperature resistance, capable of long-term use in high-temperature environments above 400°C. Furthermore, polyimide film also possesses radiation resistance, chemical corrosion resistance, and excellent electrical insulation properties; these characteristics collectively ensure its stability and reliability in extreme environments.

[0098] Figure 6 is a structural schematic diagram of the second fireproof plate provided in an embodiment of this application. Referring to Figures 4 to 6, the battery device 100 may further include at least one second fireproof plate 700. At least one second fireproof plate 700 is provided in a one-to-one correspondence with at least one battery cell assembly 400. Each second fireproof plate 700 is stacked on the side of each first fireproof plate 600 in the corresponding battery cell assembly 400 that is away from the first wall 550.

[0099] The second fireproof plate 700 is a plate-shaped structure made of high-temperature resistant non-metallic material. The number of second fireproof plates 700 is the same as the number of battery cell modules 400. For example, as shown in Figure 2, the battery device 100 includes 6 battery cell modules 400, and the number of second fireproof plates 700 is also 6. The 6 second fireproof plates 700 cover the 6 battery cell modules 400 one by one. The outer dimensions of the second fireproof plate 700 are approximately the same as the outer dimensions of the corresponding battery cell module 400, so as to maximize the coverage area and improve the protective effect.

[0100] The second fireproof plate 700 can be attached to each of the first fireproof plates 600 by gravity, or the second fireproof plate 700 can be glued to the surface of each of the first fireproof plates 600 away from the battery cell 500 by adhesive.

[0101] The second fireproof plate 700 is stacked on the entire battery cell assembly 400, which can further play a protective role and reduce the possibility that the high-temperature material generated after the battery cell 500 experiences thermal runaway will fall between two adjacent battery cells 500, thereby reducing the possibility of heat spread from the side of the battery cell 500.

[0102] In some embodiments, the heat resistance temperature of the second fireproof board 700 is greater than or equal to 400°C, where heat resistance temperature refers to the temperature at which the material begins to significantly reduce its mechanical strength.

[0103] This makes the second fireproof plate 700 less susceptible to melting by the high-temperature substances ejected from the battery cell 500 during thermal runaway, thus providing effective heat insulation and flame retardancy.

[0104] For example, the heat resistance temperature of the second fireproof board 700 can be 400℃, 500℃, 700℃, 1000℃, or 1500℃, etc. In some other embodiments, the heat resistance temperature of the second fireproof board 700 is greater than or equal to 800℃.

[0105] The second fireproof board 700 can be a mica sheet or a polyimide film (PI film). The first fireproof board 600 and the second fireproof board 700 can be made of the same material, in which case their heat resistance temperatures can be equal. Alternatively, the first fireproof board 600 and the second fireproof board 700 can be made of different materials, in which case the heat resistance temperature of the first fireproof board 600 is greater than that of the second fireproof board 700, or the heat resistance temperature of the first fireproof board 600 is less than that of the second fireproof board 700.

[0106] In some embodiments, the second fireproof plate 700 is provided with a plurality of pressure relief mechanism clearance holes 710, and the plurality of pressure relief mechanism clearance holes 710 are provided in a one-to-one correspondence with the pressure relief mechanisms 540 of the plurality of battery cells 500.

[0107] The number of pressure relief mechanism clearance holes 710 on the second fireproof plate 700 is consistent with the number of battery cells 500 in the battery cell assembly 400 it covers. The second fireproof plate 700 has a pressure relief mechanism clearance hole 710 at the position corresponding to the pressure relief mechanism 540 of each battery cell 500. The pressure relief mechanism clearance hole 710 penetrates the second fireproof plate 700 along its thickness direction. The orthographic projection of the pressure relief mechanism 540 on the second fireproof plate 700 can fall within the range of the pressure relief mechanism clearance hole 710, so as to avoid obstructing the pressure relief mechanism 540 as much as possible.

[0108] The pressure relief mechanism clearance hole 710 is used to avoid the pressure relief mechanism 540, which can avoid obstructing the pressure relief mechanism 540 as much as possible, reducing the possibility that the second fireproof plate 700 will be blown up, thereby further reducing the possibility that the high temperature material generated by the pressure relief mechanism clearance hole 710 will fall between two adjacent battery cells 500.

[0109] In some embodiments, the battery cell 500 further includes an electrode terminal 530 disposed on the first wall 550 of the end cap, and the second fireproof plate 700 is provided with a third clearance hole 730, through which the electrode terminal 530 passes.

[0110] The electrode terminal 530 of the battery cell 500 typically protrudes from the first wall 550, and the shape of the third clearance hole 730 is adapted to the electrode terminal 530. For example, the cross-section of the electrode terminal 530 is square, and the third clearance hole 730 is a square hole.

[0111] After the second fireproof plate 700 is stacked on the battery cell 500, the electrode terminal 530 passes through the third clearance hole 730, which can, to a certain extent, limit the second fireproof plate 700 and facilitate the alignment and assembly of the second fireproof plate 700 on the battery cell 500. At the same time, the electrode terminal 530 can be exposed through the second fireproof plate 700, which facilitates the electrical connection between the bus component and the electrode terminal 530 of the battery cell 500.

[0112] In some other embodiments, two spaced-apart electrode terminals 530 are provided on the first wall 550 of the battery cell 500, and a pressure relief mechanism 540 is located between the two electrode terminals 530. The second fireproof plate 700 is smaller in size in the direction in which the two electrode terminals 530 are arranged than the distance between the two electrode terminals 530, so that the second fireproof plate 700 can be disposed between the two electrode terminals 530 without obstructing the electrode terminals 530, thus eliminating the need for a third clearance hole 730 on the second fireproof plate 700.

[0113] In some embodiments, the battery device 100 further includes a temperature sampling element, which is thermally connected to the first wall 550 of the battery cell 500 to collect the temperature of the battery cell 500, and the second fireproof plate 700 is provided with a fourth clearance hole 740, which is used to avoid the temperature sampling element.

[0114] The area of ​​the fourth clearance hole 740 can be larger than the area of ​​the temperature sampling element, so that the temperature sampling element can pass through the fourth clearance hole 740 and completely fit against the first wall 550 of the battery cell 500. For example, the fourth clearance hole 740 can be a square hole, a circular hole, etc.

[0115] The number of fourth clearance holes 740 is determined based on the number of temperature sampling elements. For example, if a temperature sampling element is attached to the first wall 550 of each battery cell 500, then the number of fourth clearance holes 740 is the same as the number of battery cells 500 in the corresponding battery cell assembly 400.

[0116] The fourth clearance hole 740 is used to avoid the temperature sampling component, so that the temperature sampling component can contact the first wall 550 of the end cap of the battery cell 500 for sampling, thereby improving the accuracy of the sampled temperature.

[0117] In some embodiments, the battery cell assembly 400 further includes a heat insulation pad 800, which is disposed between two adjacent battery cells 500.

[0118] The heat insulation pad 800 can be an aerogel pad. Aerogel pads have excellent heat insulation and cushioning functions, which can block heat transfer to adjacent battery cells 500 and prevent heat diffusion. In addition, aerogel pads also have good compressibility, and while providing heat insulation, they can also be used as a cushioning material between adjacent battery cells 500 to accommodate the expansion and contraction changes of battery cells 500 during charging and discharging.

[0119] When the heat insulation pad 800 is placed between two adjacent battery cells 500, the heat insulation pad 800 can be flush with or lower than the first wall 550 of the battery cell 500. In this way, the heat insulation pad 800 will not interfere with the first fireproof plate 600, and the first fireproof plate 600 can be stacked on the first wall 550 of the battery cell 500.

[0120] The thermal insulation pad 800 can provide protection between two adjacent battery cells 500, reducing the possibility of thermal runaway propagation from the side of the battery cell 500.

[0121] This application also provides an electrical device, including the battery device 100 of the above embodiments, which is used to provide electrical energy.

[0122] Please refer to Figures 4 to 6. This application embodiment provides a battery device 100, including multiple battery cell assemblies 400 and multiple second fireproof plates 700. Each battery cell assembly 400 includes multiple battery cells 500 and multiple first fireproof plates 600. The multiple battery cells 500 are arranged along a first direction X. Each battery cell 500 includes a first wall 550 and a pressure relief mechanism 540 disposed on the first wall 550. The multiple first fireproof plates 600 are arranged along the first direction X and correspond one-to-one with each of the multiple battery cells 500. The multiple first fireproof plates 600 are independent of each other and are stacked on the first wall 550 of each of the multiple battery cells 500, covering the pressure relief mechanism 540. The multiple second fireproof plates 700 correspond one-to-one with each of the multiple battery cell assemblies 400, with each second fireproof plate 700 stacked on the side of each first fireproof plate 600 in the corresponding battery cell assembly 400 that faces away from the first wall 550.

[0123] Both the first fireproof plate 600 and the second fireproof plate 700 are made of mica sheets. The first fireproof plate 600 includes a first plate body 630, a second plate body 640, and connecting ribs 650. The second plate body 640 is configured to correspond to the pressure relief mechanism 540 of the battery cell 500. The first plate body 630 surrounds the outer periphery of the second plate body 640, and the periphery of the second plate body 640 is spaced apart from the first plate body 630. The second plate body 640 is connected to the first plate body 630 through the connecting ribs 650. The second plate body 640 is configured to disconnect from the first plate body 630 when the pressure relief mechanism 540 ruptures. The second fireproof plate 700 has multiple pressure relief mechanism clearance holes 710, which are configured one-to-one with the pressure relief mechanisms 540 of the multiple battery cells 500.

[0124] In this embodiment, a first fireproof plate 600 is stacked on the first wall 550 of each battery cell 500. When a battery cell 500 experiences thermal runaway, causing the pressure relief mechanism 540 to eject high-temperature gas, the first fireproof plates 600 are independent of each other, and the surrounding first fireproof plates 600 are not easily blown away by the high-temperature gas, thus still providing effective protection. This reduces the possibility of causing thermal runaway in other battery cells 500. The second fireproof plate 700 further provides protection, reducing the possibility of high-temperature substances generated after thermal runaway of a battery cell 500 falling between two adjacent battery cells 500, thereby reducing the possibility of heat spread from the side of the battery cell 500 and improving the safety and reliability of the entire battery device 100. In addition, the first fireproof plate 600 is provided with a second plate 640 that is easily broken at the position corresponding to the pressure relief mechanism 540, and the second fireproof plate 700 is provided with a pressure relief mechanism avoidance hole 710 at the position corresponding to the pressure relief mechanism 540, which to a certain extent avoids obstruction of the pressure relief mechanism 540 and ensures that the pressure relief mechanism 540 can be ejected normally in the event of thermal runaway.

[0125] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, comprising: At least one battery cell assembly, each battery cell assembly including multiple battery cells and multiple first fireproof plates, the multiple battery cells being arranged along a first direction, each battery cell including a first wall and a pressure relief mechanism disposed on the first wall, the multiple first fireproof plates being arranged along the first direction and corresponding one-to-one with the multiple battery cells, the multiple first fireproof plates being independent of each other, the multiple first fireproof plates being stacked on the first wall of the multiple battery cells respectively, and covering the pressure relief mechanism.

2. The battery device according to claim 1, wherein, The first fireproof board includes a first plate and a second plate that are connected to each other. The second plate is provided corresponding to the pressure relief mechanism and is configured to disconnect from the first plate when the pressure relief mechanism breaks.

3. The battery device according to claim 2, wherein, The first fireproof board also includes connecting ribs, and the periphery of the second board is spaced apart from the first board. The second board is connected to the first board through the connecting ribs.

4. The battery device according to claim 2 or 3, wherein, The thickness of the second plate is less than the thickness of the first plate.

5. The battery device according to any one of claims 1 to 4, wherein, The battery cell also includes an electrode terminal disposed on the first wall, and the first fireproof plate is provided with a first clearance hole, through which the electrode terminal passes.

6. The battery device according to any one of claims 1 to 5, wherein, The battery device further includes a temperature sampling element, which is thermally connected to the first wall of the battery cell to collect the temperature of the battery cell. The first fireproof plate is provided with a second clearance hole, which is used to avoid the temperature sampling element.

7. The battery device according to any one of claims 1 to 6, wherein, The battery device further includes at least one second fireproof plate, and at least one second fireproof plate is provided in a one-to-one correspondence with at least one of the battery cell components. Each second fireproof plate is stacked on the side of each first fireproof plate in the corresponding battery cell component that is away from the first wall.

8. The battery device according to claim 7, wherein, The heat resistance temperature of the first fireproof board is greater than or equal to 400℃.

9. The battery device according to claim 7 or 8, wherein, The heat resistance temperature of the second fireproof board is greater than or equal to 400℃.

10. The battery device according to claims 7 to 9, wherein, The first fireproof board is a mica sheet.

11. The battery device according to claims 7 to 10, wherein, The second fireproof board is a mica sheet.

12. The battery device according to any one of claims 7 to 11, wherein, The second fireproof plate is provided with multiple pressure relief mechanism clearance holes, and the multiple pressure relief mechanism clearance holes are arranged one-to-one with the pressure relief mechanism of the multiple battery cells.

13. The battery device according to any one of claims 7 to 12, wherein, The battery cell also includes an electrode terminal disposed on the first wall, and the second fireproof plate is provided with a third clearance hole, through which the electrode terminal passes.

14. The battery device according to any one of claims 7 to 13, wherein, The battery device further includes a temperature sampling element, which is thermally connected to the first wall of the battery cell to collect the temperature of the battery cell. The second fireproof plate is provided with a fourth clearance hole, which is used to avoid the temperature sampling element.

15. The battery device according to any one of claims 1 to 14, wherein, The battery cell assembly also includes a heat insulation pad, and the heat insulation pad is disposed between two adjacent battery cells.

16. An electrical appliance, wherein, Includes the battery device as described in any one of claims 1 to 15, the battery device being used to provide electrical energy.

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