Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body, a battery monomer assembly, a heat insulation assembly and a phase change heat absorption piece, the box body has an accommodating cavity. The battery monomer assembly is arranged in the accommodating cavity, the battery monomer assembly comprises a plurality of battery monomers which are sequentially arranged along a first direction, each battery monomer comprises a shell, an electrode terminal and a pressure relief mechanism, in a second direction, the shell is provided with a first wall, the electrode terminal and the pressure relief mechanism are arranged on the first wall, and the first direction is perpendicular to the second direction. The insulating assembly covers at least a portion of the first wall of each battery cell. In the second direction, the phase change heat absorption piece is arranged between the box body and the first wall. According to the scheme, the reliability of the battery device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, in particular to a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the development of battery technology, how to improve the reliability of the battery device is a technical problem that needs to be solved in battery technology. CONTENT OF THE INVENTION

[0004] The present application provides a battery device and a power utilization device, which can improve the reliability of the battery device.

[0005] The present application is achieved by the following technical solutions:

[0006] In a first aspect, the present application provides a battery device, which comprises a box body, a battery monomer assembly, a heat insulation assembly and a phase change heat absorption piece. The box body has a containing cavity. The battery monomer assembly is arranged in the containing cavity, and the battery monomer assembly comprises a plurality of battery monomers arranged in a first direction in sequence, the battery monomer comprising a shell, an electrode terminal and a pressure relief mechanism, in a second direction, the shell has a first wall, the electrode terminal and the pressure relief mechanism are arranged on the first wall, and the first direction is perpendicular to the second direction. The heat insulation assembly covers at least part of the first wall of each battery monomer. In the second direction, the phase change heat absorption piece is arranged between the box body and the first wall.

[0007] The technical solution of the present application embodiment, by arranging the heat insulation assembly to cover at least part of the first wall of each battery monomer, when one or more battery monomers are thermal runaway, the risk of the ejected substances falling on the first wall of other battery monomers to cause short circuit is reduced, which is beneficial to improve the reliability of the battery device. By arranging the phase change heat absorption piece, when one or more battery monomers are thermal runaway, the heat generated is absorbed by the phase change heat absorption piece, which is beneficial to reduce the influence of heat on other battery monomers, and is beneficial to improve the reliability of the battery device.

[0008] In some embodiments, the heat insulation assembly covers the entire first wall of each battery monomer.

[0009] The technical solution of the present application embodiment, by arranging the heat insulation assembly to cover the entire first wall of each battery monomer, further reduces the risk of the ejected substances falling on the first wall of other battery monomers to cause short circuit when one of the battery monomers is thermal runaway, which is beneficial to improve the reliability of the battery device.

[0010] In some embodiments, the thermal insulation assembly includes a plurality of first thermal insulation elements, each of which covers a first wall of a battery cell.

[0011] The technical solution of this application embodiment, by setting multiple first heat insulation components, each of which covers the first wall of a battery cell, reduces the risk of short circuit caused by material ejected from one battery cell falling onto the first wall of other battery cells when one battery cell experiences thermal runaway, thereby improving the reliability of the battery device.

[0012] In some embodiments, the battery cell assembly further includes a busbar that electrically connects to the electrode terminals of a plurality of battery cells. In the second direction, a portion of a first heat insulation member is located between the first wall and the busbar, and the first heat insulation member has an opening through which the electrode terminals pass.

[0013] The technical solution of this application embodiment provides an opening in the first heat insulation member, allowing the electrode terminal to pass through the opening, thereby reducing the risk of interference between the first heat insulation member and the electrode terminal, and also improving the convenience of connecting the busbar and the electrode terminal.

[0014] In some embodiments, the battery cell assembly further includes a busbar that electrically connects to the electrode terminals of the plurality of battery cells. The thermal insulation assembly includes a second thermal insulation member that covers a first wall of each battery cell and the busbar.

[0015] The technical solution of this application embodiment covers the first wall of each battery cell and the busbar component with a second heat insulation component, which helps to reduce the installation difficulty of the heat insulation component covering the first wall, and the processing difficulty of the second heat insulation component is low, which helps to improve the processing convenience of the heat insulation component.

[0016] In some embodiments, the thermal insulation assembly further includes a plurality of first thermal insulation members, each first thermal insulation member covering a first wall of a battery cell. A second thermal insulation member is disposed on the side of the first thermal insulation member opposite to the first wall.

[0017] The technical solution of this application embodiment, by setting a first heat insulation component and a second heat insulation component, both of which cover the first wall of the battery cell, can reduce the risk of ejected material falling on the first wall of other battery cells and causing a short circuit, thereby improving the reliability of the battery device.

[0018] In some embodiments, in the second direction, the surface of the second heat insulation member facing away from the first heat insulation member forms a receiving space with the housing, and the phase change heat absorption member is disposed in the receiving space.

[0019] The technical solution of this application embodiment, by setting the phase change heat absorber in the containment space, absorbs the heat of the high-temperature material that accumulates in the containment space when the battery cell experiences thermal runaway, which helps to reduce the impact of heat on other battery cells and improve the reliability of the battery device.

[0020] In some embodiments, the housing is provided with an exhaust port that communicates with the receiving space.

[0021] The technical solution of this application embodiment connects the exhaust port to the containment space, so that the high-temperature gas generated by thermal runaway can be discharged from the exhaust port, reducing the risk of explosion caused by excessive gas pressure inside the box, and improving the reliability of the battery device.

[0022] In some embodiments, the phase change heat absorber extends along a first direction, and there are multiple phase change heat absorbers. In a third direction, the multiple phase change heat absorbers are spaced apart, and the first direction, the second direction, and the third direction are perpendicular to each other. A flow channel is defined between two adjacent phase change heat absorbers, and the flow channel is connected to an exhaust port.

[0023] The technical solution of this application embodiment defines a flow channel connected to the exhaust port between two adjacent phase change heat absorbers. On the one hand, it can guide the gas and improve the efficiency of gas discharge. On the other hand, it can make the gas absorb heat better after passing through the phase change heat absorber, so that the temperature of the gas discharged from the exhaust port is lower and the impact on the outside world is reduced.

[0024] In some embodiments, the thermal insulation component covers the pressure relief mechanism of each battery cell.

[0025] The technical solution of this application embodiment, by setting a heat insulation component to cover the pressure relief mechanism of the battery cell, can reduce the risk of short circuit caused by ejected material falling on the area of ​​the pressure relief mechanism corresponding to the first wall of other battery cells when one or more battery cells are thermally runaway, thereby improving the reliability of the battery device.

[0026] In some embodiments, the heat insulation assembly is provided with a pressure relief section, which corresponds to the pressure relief mechanism of each battery cell along the second direction. The pressure relief section is configured to rupture to release the pressure relief material of the battery cell.

[0027] The technical solution of this application embodiment reduces the risk of phase change heat absorption components affecting the pressure relief of battery cells by setting a pressure relief part corresponding to the pressure relief mechanism in the heat insulation component, which helps to improve the reliability of the battery device.

[0028] In some embodiments, along the second direction, the orthographic projection of the phase change heat absorber does not overlap with the orthographic projection of the pressure relief mechanism.

[0029] The technical solution of this application embodiment reduces the risk of the phase change heat absorber affecting the pressure relief of the battery cell by setting the phase change heat absorber to not overlap with the pressure relief mechanism, which helps to improve the reliability of the battery device.

[0030] In some embodiments, the thermal insulation component includes ceramic fibers, alumina fibers, phosphorus-nitrogen intumescent coatings, paraffin wax, or graphene composites.

[0031] The technical solutions of this application embodiment have good thermal insulation performance. Ceramic fibers, alumina fibers, phosphorus-nitrogen-based expansion coatings, paraffin wax or graphene composites have good thermal insulation performance. By selecting ceramic fibers, alumina fibers, phosphorus-nitrogen-based expansion coatings, paraffin wax or graphene composites to form thermal insulation components, it is beneficial to improve the thermal insulation performance of thermal insulation components, reduce the risk of sprayed materials falling on the first wall of other battery cells and causing short circuits, and improve the reliability of battery devices.

[0032] In some embodiments, the phase change heat absorber is made of stearic acid, lauric acid, or a porous composite material.

[0033] The technical solution of this application embodiment has good phase change heat absorption performance of stearic acid, lauric acid and porous matrix composite material. By selecting stearic acid, lauric acid or porous matrix composite material to form phase change heat absorption component, it is beneficial to improve the phase change heat absorption performance of phase change heat absorption component, reduce the impact of heat on other battery cells, and improve the reliability of battery device.

[0034] In some embodiments, the battery device further includes a housing disposed on the side of the heat insulation assembly away from the first wall, and a phase change heat absorber disposed within the housing.

[0035] The technical solution of this application embodiment reduces the risk of damage to the phase change heat absorber due to interference between the phase change heat absorber and other components of the housing, and reduces the risk of heat absorption failure due to the phase change heat absorber moving due to shaking, thereby improving the reliability of the battery device.

[0036] Secondly, this application provides an electrical device, including a battery device as described in any embodiment of the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0040] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0041] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0042] Figure 4 This is a partial internal schematic diagram of a battery device provided in some embodiments of this application;

[0043] Figure 5 This is a partial internal schematic diagram of a battery device provided in other embodiments of this application;

[0044] Figure 6 A schematic diagram of a first thermal insulation element provided for some embodiments of this application;

[0045] Figure 7 A partial internal schematic diagram of a battery device provided for some embodiments of this application;

[0046] Figure 8 A partial internal schematic diagram of another part of a battery device provided in some embodiments of this application;

[0047] Figure 9 An internal schematic diagram of a battery device provided in some embodiments of this application from another perspective;

[0048] Figure 10 This is a schematic diagram illustrating the cooperation between the receiving element and the phase change heat absorber provided in some embodiments of this application.

[0049] Icons: 1-Battery unit; 10-Box; 11-First sub-box; 12-Second sub-box; 13-Exhaust port; 14-Receiving cavity; 20-Battery cell assembly; 21-Battery cell; 211-Outer shell; 2111-Housing shell; 2112-End cap; 2113-First wall; 212-Electrode assembly; 213-Electrode terminal; 214-Pressure relief mechanism; 215-Buffer component; 30-Heat insulation assembly; 31-First heat insulation component; 311-Opening; 32-Second heat insulation component; 321-Flow channel; 33-Pressure relief section; 40-Phase change heat absorption component; 50-Receiving space; 60-Receiving component; 100-Vehicle; 110-Controller; 120-Motor; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0050] 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 and completely 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.

[0051] 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.

[0052] 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 one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. 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.

[0053] 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.

[0054] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, "second circuit board and / or first circuit board" can represent three cases: the second circuit board exists alone, the second circuit board and the first circuit board exist simultaneously, or the first circuit board exists alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0056] 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.

[0057] 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 into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0058] 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.

[0059] 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.

[0060] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0061] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0062] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0063] As an example, the box body can be part of the vehicle's chassis structure. For instance, the box body's roof can be part of the vehicle's floor, or the box body's frame can be part of the vehicle's crossbeams and longitudinal beams.

[0064] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0065] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0066] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0067] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0068] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on one surface of the positive current collector.

[0069] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0070] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the positive electrode active material may include one of the following: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0072] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0073] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0074] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0075] As an example, the negative electrode active material may be any negative electrode active material known in the art for use in batteries. For example, the negative electrode active material may include one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0076] In some embodiments, the separator is a diaphragm. This application does not impose any particular limitation on the type of diaphragm; any known porous diaphragm with good chemical and mechanical stability can be selected.

[0077] As an example, the main material of the separator can be selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0078] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0079] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0080] In some implementations, the electrode assembly is a stacked structure.

[0081] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0082] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0083] In some embodiments, an electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0084] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0085] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0086] As an example, a battery cell can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0087] Currently, judging from market trends, battery devices are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage equipment, and many other fields. As the application areas for batteries continue to expand, the market demand is also constantly increasing.

[0088] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of battery devices is also a key consideration as environmental and / or internal battery conditions change.

[0089] During transportation or use, individual battery cells are at risk of thermal runaway (when thermal runaway occurs, high-temperature gas, liquid, or impurities generated by the battery cell are ejected from the pressure relief mechanism). If the ejected substances come into contact with adjacent battery cells, it can easily lead to a short circuit between adjacent battery cells, thereby affecting the reliability of the battery device.

[0090] Based on the above considerations, in order to solve the problem that when a battery cell experiences thermal runaway, the ejected material comes into contact with adjacent battery cells, causing short circuits in adjacent battery cells and thus affecting the reliability of the battery device, this application provides a battery device. In a first aspect, this application provides a battery device including a housing, a battery cell assembly, a heat insulation assembly, and a phase change heat absorber. The housing has a receiving cavity. The battery cell assembly is disposed in the receiving cavity, and the battery cell assembly includes a plurality of battery cells arranged sequentially along a first direction. Each battery cell includes a shell, electrode terminals, and a pressure relief mechanism. In a second direction, the shell has a first wall, and the electrode terminals and pressure relief mechanism are both disposed on the first wall. The first direction is perpendicular to the second direction. The heat insulation assembly covers at least a portion of the first wall of each battery cell. In the second direction, the phase change heat absorber is disposed between the housing and the first wall.

[0091] The technical solution of this application embodiment, by setting a heat insulation component to cover at least a portion of the first wall of each battery cell, can reduce the risk of ejected material falling onto the first wall of other battery cells and causing a short circuit when one or more battery cells experience thermal runaway, thus improving the reliability of the battery device. By setting a phase change heat absorber, the heat generated when one or more battery cells experience thermal runaway is absorbed by the phase change heat absorber, which helps reduce the impact of heat on other battery cells, further improving the reliability of the battery device.

[0092] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices. Electrical devices may include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0093] 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.

[0094] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 100 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 1 is installed inside the vehicle 100, and the battery device 1 can be located at the bottom, front, or rear of the vehicle 100. The battery device 1 can be used to power the vehicle 100; for example, the battery device 1 can serve as the operating power source for the vehicle 100's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 100.

[0095] The vehicle 100 may also include a controller 110 and a motor 120. The controller 110 is used to control the battery device 1 to supply power to the motor 120, for example, for the power needs of the vehicle 100 during startup, navigation and driving.

[0096] In some embodiments of this application, the battery device 1 can not only serve as the operating power source of the vehicle 100, but also as the driving power source of the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0097] The battery device includes battery cell modules and a power management system. The battery management system is connected to the battery cell modules and is used to manage the charging and discharging of the battery cell modules.

[0098] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. Figure 2 The structure conceals the heat insulation components and phase change heat absorbers. The battery device 1 may include a housing 10 and battery cells 21, with the battery cells 21 housed within the housing 10.

[0099] The housing 10 provides a space for housing the battery cell 21, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, and together define a space for housing the battery cell 21. The first sub-housing 11 may be a hollow structure with one open end, and the second sub-housing 12 may be a plate-like structure, which overlaps the open side of the first sub-housing 11 so that the first sub-housing 11 and the second sub-housing 12 together define the space; the first sub-housing 11 and the second sub-housing 12 may also be hollow structures with one open side, and the open side of the first sub-housing 11 overlaps the open side of the second sub-housing 12.

[0100] In the battery device 1, there can be multiple battery cells 21, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 21 are connected in both series and parallel configurations. Multiple battery cells 21 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 21 is housed within the housing 10. Alternatively, the battery device 1 can also consist of multiple battery cells 21 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 1 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 21.

[0101] Please refer to Figure 3 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. For example... Figure 3 As shown, the battery cell 21 includes a housing 211, an electrode assembly 212, and electrode terminals 213. The housing 211 includes a shell 2111 and an end cap 2112. The shell 2111 has an opening, and the end cap 2112 closes the opening to isolate the internal environment of the battery cell 21 from the external environment.

[0102] The housing 2111 is a component used to cooperate with the end cap 2112 to form the internal environment of the battery cell 21, wherein the formed internal environment can accommodate the electrode assembly 212, electrolyte, and other components. The housing 2111 and the end cap 2112 can be independent components. The housing 2111 can have various shapes and sizes. Specifically, the shape of the housing 2111 can be determined according to the specific shape and size of the electrode assembly 212. The housing 2111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0103] End cap 2112 refers to a component that covers the opening of housing 2111 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 2112 can be adapted to the shape of housing 2111 to fit it. Optionally, end cap 2112 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 2112 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 2112. Electrode terminals can be used for electrical connection with electrode assembly 212 to output or input electrical energy to battery cell 21. The material of end cap 2112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 2112. The insulating structure can be used to isolate the electrical connection components within the housing 2111 from the end cap 2112 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0104] Please refer to Figure 2 and Figure 3 and refer to Figure 4 , Figure 4 This is a partial internal schematic diagram of a battery device provided in some embodiments of this application. Embodiments of this application provide a battery device 1, which includes a housing 10, a battery cell assembly 20, a heat insulation assembly 30, and a phase change heat absorber 40. The housing 10 has a receiving cavity 14. The battery cell assembly 20 is disposed in the receiving cavity 14, and the battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially along a first direction X. Each battery cell 21 includes a housing 211, electrode terminals 213, and a pressure relief mechanism 214. In a second direction Y, the housing 211 has a first wall 2113, and the electrode terminals 213 and the pressure relief mechanism 214 are both disposed on the first wall 2113. The first direction X is perpendicular to the second direction Y. The heat insulation assembly 30 covers at least a portion of the first wall 2113 of each battery cell 21. In the second direction Y, the phase change heat absorber 40 is disposed between the housing 10 and the first wall 2113.

[0105] In some embodiments, when a thermal runaway occurs in a battery cell 21, the pressure relief mechanism 214 can rupture to expel high-temperature substances (high-temperature gas, liquid, or impurities) from the battery cell 21's casing 211.

[0106] In some embodiments, the battery cell assembly 20, the heat insulation assembly 30, and the phase change heat absorber 40 are all disposed within the receiving cavity 14.

[0107] In some embodiments, the first direction can be represented by the direction indicated by the letter X in the figure.

[0108] In some embodiments, the second direction can be represented by the direction indicated by the letter Y in the figure.

[0109] In some embodiments, the first direction X may be parallel to the length direction of the housing 10, the second direction Y may be parallel to the height direction of the housing 10, and the first direction X and the second direction Y may be perpendicular.

[0110] In some embodiments, the electrode terminal 213 and the pressure relief mechanism 214 are both disposed on the first wall 2113. The first wall 2113 can be the end cap 2112 of the battery cell 21, that is, the first wall 2113 is the wall of the battery cell 21 located above the outer shell 211 of the battery cell 21 in the height direction of the housing 10.

[0111] In some embodiments, the thermal insulation component 30 may cover a portion of the first wall 2113 of each battery cell 21.

[0112] In some embodiments, the heat insulation component 30 may cover the entire portion of the first wall 2113 of each battery cell 21.

[0113] In some embodiments, there are multiple battery cells 21, and the heat insulation component 30 can cover a portion of the first wall 2113 of a portion of the battery cells 21, and the heat insulation component 30 can cover the entire first wall 2113 of another portion of the battery cells 21.

[0114] In some embodiments, the phase change heat absorber 40 is disposed between the housing 10 and the first wall 2113. In the second direction Y, the housing 211 has a first wall 2113 and a second wall disposed opposite to each other, the first wall 2113 may be located above the second wall, and the phase change heat absorber 40 is disposed between the housing cover located above the housing 10 and the first wall 2113.

[0115] When one of the battery cells 21 experiences thermal runaway, high-temperature material is ejected from the pressure relief mechanism 214, that is, from the first wall 2113 of the battery cell 21. This high-temperature material contains conductive material. When the high-temperature material falls onto the first wall 2113 of an adjacent battery cell 21, the heat insulation component 30 blocks at least a portion of the high-temperature material from falling onto the first wall 2113 of the adjacent battery cell 21, reducing the risk of short circuits in adjacent battery cells 21.

[0116] Meanwhile, the phase change heat absorber 40 comes into contact with a high-temperature substance or the heat from the high-temperature substance is transferred to the phase change heat absorber 40, and the phase change heat absorber 40 absorbs at least part of the heat to reduce the impact of heat on the adjacent battery cell 21.

[0117] The technical solution of this application embodiment, by setting the heat insulation component 30 to cover at least a portion of the first wall 2113 of each battery cell 21, can reduce the risk of ejected material falling onto the first wall 2113 of other battery cells 21 and causing a short circuit when one or more battery cells 21 experience thermal runaway, thus improving the reliability of the battery device 1. By setting the phase change heat absorber 40, when one or more battery cells 21 experience thermal runaway, the heat generated is absorbed by the phase change heat absorber 40, which helps to reduce the impact of heat on other battery cells 21, thus improving the reliability of the battery device 1.

[0118] Please refer to Figures 2 to 4 In some embodiments, the thermal insulation component 30 covers the entire first wall 2113 of each battery cell 21.

[0119] In some embodiments, the heat insulation component 30 may be a plurality of sub-heat insulation components, which are plate-shaped, and one sub-heat insulation component covers the entire portion of the first wall 2113 of a battery cell 21. With the second direction Y as the projection direction, the orthographic projection of a sub-heat insulation component overlaps with the orthographic projection of the first wall 2113 of a battery cell 21.

[0120] In some embodiments, the heat insulation component 30 may be a sub-heat insulation member that covers the entire first wall 2113 of all battery cells 21. With the second direction Y as the projection direction, the orthographic projection of the sub-heat insulation member covers the orthographic projection of the first wall 2113 of all battery cells 21.

[0121] The technical solution of this application embodiment, by setting the heat insulation component 30 to cover the entire first wall 2113 of each battery cell 21, further reduces the risk of short circuit caused by the material ejected from one battery cell 21 falling on the first wall 2113 of other battery cells 21 when one battery cell 21 thermally runs away, which is beneficial to improving the reliability of the battery device 1.

[0122] Please refer to Figures 2 to 4 and refer to Figure 5 , Figure 5 This is a partial internal schematic diagram of a battery device provided for other embodiments of this application. In some embodiments, the heat insulation assembly 30 includes a plurality of first heat insulation members 31, each of which covers a first wall 2113 of a battery cell 21.

[0123] In some embodiments, the number of first heat insulation elements 31 may be the same as the number of battery cells 21.

[0124] In some embodiments, a plurality of first heat insulation members 31 may be spaced apart, that is, with the second direction Y as the projection direction, the orthographic projection of a sub-heat insulation member overlaps with the orthographic projection of the first wall 2113 of a battery cell 21. Alternatively, two adjacent first heat insulation members 31 may be in contact or connected, that is, with the second direction Y as the projection direction, the orthographic projection of a sub-heat insulation member exceeds the orthographic projection of the first wall 2113 of a battery cell 21.

[0125] In some embodiments, the first heat insulation member 31 may contact the first wall 2113, and the first wall 2113 supports the first heat insulation member 31.

[0126] In some embodiments, the first heat insulation member 31 may be spaced apart from the first wall 2113, and the first heat insulation member 31 is connected to the inner wall surface of the housing 10 by adhesive, welding or bolting.

[0127] In some embodiments, the first heat insulation member 31 may be a plate-shaped member, and the thickness direction of the first heat insulation member 31 may be parallel to the second direction Y.

[0128] The technical solution of this application embodiment, by setting multiple first heat insulation components 31, and each first heat insulation component 31 covering the first wall 2113 of a battery cell 21, reduces the risk of short circuit caused by the material ejected from one battery cell 21 falling on the first wall 2113 of other battery cells 21 when one battery cell 21 thermally runs away, which is beneficial to improving the reliability of the battery device 1.

[0129] Please refer to Figures 2 to 5 and refer to Figure 6 , Figure 6 This is a schematic diagram of a first heat insulation member provided in some embodiments of this application. In some embodiments, the battery cell assembly 20 further includes a busbar 215 electrically connected to the electrode terminals 213 of a plurality of battery cells 21. In the second direction Y, a portion of the first heat insulation member 31 is located between the first wall 2113 and the busbar 215, and the first heat insulation member 31 has an opening 311 through which the electrode terminals 213 pass.

[0130] In some embodiments, the first heat insulation member 31 is provided with an opening 311, which can be formed by machining or integrally formed with the first heat insulation member 31.

[0131] In some embodiments, the inner diameter of the opening 311 may be larger than the maximum outer diameter of the electrode terminal 213 so that the electrode terminal 213 can pass through the opening 311.

[0132] In some embodiments, in the second direction Y, the first wall 2113 may be located below the first heat insulation member 31, and the confluence member 215 may be located above the first heat insulation member 31.

[0133] The technical solution of this application embodiment provides an opening 311 in the first heat insulation member 31, so that the electrode terminal 213 can pass through the opening 311, thereby reducing the risk of interference between the first heat insulation member 31 and the electrode terminal 213, and at the same time improving the convenience of connecting the bus component 215 and the electrode terminal 213.

[0134] Please refer to Figures 2 to 4 and refer to Figure 7 , Figure 7 This is a partial internal schematic diagram of a battery device provided for some embodiments of this application. In some embodiments, the battery cell assembly 20 further includes a busbar 215 electrically connected to the electrode terminals 213 of a plurality of battery cells 21. The heat insulation assembly 30 includes a second heat insulation member 32 covering a first wall 2113 of each battery cell 21 and the busbar 215.

[0135] In some embodiments, the number of second heat insulation members 32 can be one, with the second direction Y as the projection direction, and the orthogonal projection of one second heat insulation member 32 covers the orthogonal projection of the first wall 2113 of all battery cells 21.

[0136] In some embodiments, in the second direction Y, the busbar component 215 may be located above the first wall 2113, and the second heat insulation component 32 may be located above the busbar component 215.

[0137] In some embodiments, the second heat insulation member 32 may be plate-shaped, and the thickness direction of the second heat insulation member 32 may be parallel to the second direction Y.

[0138] In some embodiments, the second heat insulation member 32 may contact the busbar component 215. The second heat insulation member 32 may be made of an insulating material, or the surface of the second heat insulation member 32 that contacts the busbar component 215 may be provided with an insulating coating, or an insulating member may be provided between the second heat insulation member 32 and the busbar component 215.

[0139] In some embodiments, the second heat insulation component 32 may be spaced apart from the busbar component 215, and the second heat insulation component 32 may be connected to the inner wall of the housing 10 by means of adhesive bonding, welding, bolt connection or other methods.

[0140] The technical solution of this application embodiment covers the first wall 2113 and the busbar component 215 of each battery cell 21 with the second heat insulation component 32, which helps to reduce the installation difficulty of the heat insulation assembly 30 covering the first wall 2113, and the processing difficulty of the second heat insulation component 32 is relatively low, which helps to improve the processing convenience of the heat insulation assembly 30.

[0141] Please refer to Figures 2 to 4In some embodiments, the heat insulation assembly 30 further includes a plurality of first heat insulation elements 31, each of which covers a first wall 2113 of a battery cell 21. A second heat insulation element 32 is disposed on the side of the first heat insulation element 31 opposite to the first wall 2113.

[0142] In some embodiments, the heat insulation assembly 30 includes a first heat insulation element 31 and a second heat insulation element 32, which are spaced apart. The first heat insulation element 31 may be disposed on a first wall 2113, and the second heat insulation element 32 may be disposed on a busbar 215, with the second heat insulation element 32 located above the first heat insulation element 31.

[0143] In some embodiments, the second heat insulation member 32 is disposed on the side of the first heat insulation member 31 away from the first wall 2113, that is, in the second direction Y, the first heat insulation member 31 is located between the second heat insulation member 32 and the first wall 2113.

[0144] The technical solution of this application embodiment, by setting a first heat insulation member 31 and a second heat insulation member 32, and both the first heat insulation member 31 and the second heat insulation member 32 covering the first wall 2113 of the battery cell 21, can reduce the risk of ejected material falling on the first wall 2113 of other battery cells 21 and causing a short circuit, which is beneficial to improving the reliability of the battery device 1.

[0145] Please refer to Figures 2 to 4 and refer to Figure 8 , Figure 8 This is a partial internal schematic diagram of another part of the battery device provided in some embodiments of this application. In some embodiments, in the second direction Y, the surface of the second heat insulation member 32 facing away from the first heat insulation member 31 forms a receiving space 50 with the housing 10, and the phase change heat absorption member 40 is disposed in the receiving space 50.

[0146] In some embodiments, in the second direction Y, the second heat insulation member 32 may be located above the first heat insulation member 31, that is, the lower surface of the second heat insulation member 32 faces the first heat insulation member 31, and the upper surface of the second heat insulation member 32 is away from the first heat insulation member 31. The upper surface of the second heat insulation member 32, together with the box wall above the box body 10 and the side wall of the box body 10, form the receiving space 50.

[0147] In some embodiments, the phase change heat absorber 40 is disposed in the receiving space 50. The phase change heat absorber 40 may be disposed on the second heat insulation member 32 and glued to the second heat insulation member 32. Alternatively, the phase change heat absorber 40 may be disposed at a distance from the second heat insulation member 32, and the phase change heat absorber 40 may be glued or bolted to the housing 10.

[0148] In some embodiments, when the battery cell 21 experiences thermal runaway, high-temperature material is ejected from the first wall 2113 and enters the containment space 50, and the phase change heat absorber 40 absorbs the heat of the high-temperature material entering the containment space 50.

[0149] The technical solution of this application embodiment, by setting the phase change heat absorber 40 in the accommodating space 50, absorbs the heat of the high-temperature material gathered in the accommodating space 50 when the battery cell 21 thermally runs away, which helps to reduce the impact of heat on other battery cells 21 and improve the reliability of the battery device 1.

[0150] Please refer to Figures 2 to 4 , Figure 8 In some embodiments, the housing 10 is provided with an exhaust port 13, which is connected to the accommodating space 50.

[0151] In some embodiments, the housing 10 is provided with an exhaust port 13, which can be a channel. The exhaust port 13 can be formed by machining or integrally formed with the housing 10.

[0152] In some embodiments, the exhaust port 13 can be the opening of an exhaust pipe that connects the inner and outer surfaces of the housing 10 to connect the receiving cavity 14 and the outside of the housing 10. The exhaust pipe can be connected to the housing 10 by welding, bonding, or bolting.

[0153] In some embodiments, in the second direction Y, the exhaust port 13 may be located above the second heat insulation member 32, which connects to each side wall of the housing 10 to separate the space above and below the second heat insulation member 32 (it should be noted that the second heat insulation member 32 may be provided with a channel communicating with the pressure relief mechanism 214 to transport the high-temperature material generated when the battery cell 21 is depressurized to the receiving space 50). After the high-temperature material enters the receiving space 50, the exhaust port 13 is located in the space above the second heat insulation member 32 to discharge the high-temperature material from the housing 10.

[0154] In some embodiments, the battery device 1 may further include an expansion beam disposed at one end of the battery cell assembly 20 in the first direction X, and the expansion beam divides the receiving cavity 14 into two chambers arranged along the first direction X. The battery cell assembly 20 is disposed in one of the chambers, and the exhaust port 13 is located on the wall forming the other chamber. One end of the second heat insulation member 32 may be disposed on the upper surface of the expansion beam so that the receiving space 50 communicates with the chamber provided with the exhaust port 13. When a high-temperature substance enters the receiving space 50, the high-temperature substance enters the chamber provided with the exhaust port 13 above the expansion beam, and the exhaust port 13 discharges the high-temperature substance from the housing 10.

[0155] The technical solution of this application embodiment connects the exhaust port 13 with the accommodating space 50, so that the high-temperature gas generated by thermal runaway can be discharged from the exhaust port 13, reducing the risk of explosion caused by excessive gas pressure inside the box 10, and improving the reliability of the battery device 1.

[0156] Please refer to Figures 2 to 4 , Figure 8 and refer to Figure 9 , Figure 9 This is an internal schematic diagram of a battery device provided in some embodiments of this application from another perspective. In some embodiments, a phase change heat absorber 40 extends along a first direction X, and there are multiple phase change heat absorbers 40. In a third direction Z, the multiple phase change heat absorbers 40 are spaced apart, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. A flow channel 321 is defined between two adjacent phase change heat absorbers 40, and the flow channel 321 communicates with the exhaust port 13.

[0157] In some embodiments, the third direction can be represented by the direction indicated by the letter Z in the figure.

[0158] In some embodiments, the third direction Z can be parallel to the width direction of the housing 10, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0159] In some embodiments, the phase change heat absorber 40 may extend along a first direction X, at least covering at least a portion of at least the first wall 2113. In the first direction X, the size of the phase change heat absorber 40 may be the same as the size of the battery cell assembly 20, and both ends of the phase change heat absorber 40 may be flush with both ends of the battery cell assembly 20. Alternatively, in the first direction X, the size of the phase change heat absorber 40 may be larger than the size of the battery cell assembly 20, and both ends of the phase change heat absorber 40 may extend beyond both ends of the battery cell assembly 20, or one end of the phase change heat absorber 40 may be flush with one end of the battery cell assembly 20, and the other end of the phase change heat absorber 40 may extend beyond the other end of the battery cell assembly 20.

[0160] In some embodiments, multiple phase change heat absorbers 40 are spaced apart in the third direction Z, and with the third direction Z as the projection direction, the orthographic projections of each phase change heat absorber 40 can overlap.

[0161] In some embodiments, a flow channel 321 is defined between two adjacent phase change heat absorbers 40. When a high-temperature substance enters the containment space 50, the high-temperature substance is transported to the exhaust port 13 through the flow channel 321, and the exhaust port 13 discharges the high-temperature substance.

[0162] It should be noted that, in the second direction Y, the size of the accommodating space 50 can be equal to the thickness of the phase change heat absorber 40, or the size of the accommodating space 50 can be smaller, so that more high-temperature material can be guided by the flow channel 321.

[0163] The technical solution of this application embodiment defines a flow channel 321 that communicates with the exhaust port 13 between two adjacent phase change heat absorbers 40. On the one hand, it can guide the gas and improve the efficiency of gas discharge. On the other hand, it can make the gas absorb heat better after passing through the phase change heat absorber 40, so that the temperature of the gas discharged from the exhaust port 13 is lower and the impact on the outside world is reduced.

[0164] Please refer to Figures 2 to 4 , Figure 9 In some embodiments, the heat insulation component 30 covers the pressure relief mechanism 214 of each battery cell 21.

[0165] In some embodiments, with the second direction Y as the projection direction, the orthographic projection of the heat insulation component 30 can cover the orthographic projection of the pressure relief mechanism 214 of each battery cell 21. When a battery cell 21 experiences thermal runaway, high-temperature substances are discharged through the pressure relief mechanism 214 of that battery cell 21. The pressure relief mechanisms 214 of adjacent battery cells 21 are covered by the heat insulation component 30, making it difficult for the discharged high-temperature substances to come into contact with the pressure relief mechanisms 214 of adjacent battery cells 21, reducing the risk of damage to adjacent pressure relief mechanisms 214, and at the same time reducing the risk of short circuits in the area of ​​the first wall 2113 of adjacent battery cells 21 corresponding to the pressure relief mechanism 214.

[0166] The technical solution of this application embodiment, by setting the heat insulation component 30 to cover the pressure relief mechanism 214 of the battery cell 21, can reduce the risk of short circuit caused by the ejected material falling on the area of ​​the first wall 2113 of other battery cells 21 corresponding to the pressure relief mechanism 214 when one or more battery cells 21 thermally runaway, thereby improving the reliability of the battery device 1.

[0167] Please refer to Figures 2 to 4 , Figure 8 and Figure 9 In some embodiments, the heat insulation assembly 30 is provided with a pressure relief section 33 along the second direction Y, the pressure relief section 33 corresponds to the pressure relief mechanism 214 of each battery cell 21, and the pressure relief section 33 is configured to rupture to release the pressure relief material of the battery cell 21.

[0168] In some embodiments, the pressure relief section 33 may be a groove or a separate sheet.

[0169] In some embodiments, the pressure relief mechanism 214 may be a notch or a separate sheet.

[0170] In some embodiments, the structure of the pressure relief mechanism 214 may be the same as or different from the structure of the pressure relief part 33.

[0171] In some embodiments, the number of pressure relief sections 33 can be multiple, and along the second direction Y, one pressure relief section 33 corresponds to the pressure relief mechanism 214 of one battery cell 21. With the second direction Y as the projection direction, at least a portion of the orthographic projection of the pressure relief section 33 and the orthographic projection of the corresponding pressure relief mechanism 214 can overlap.

[0172] In some embodiments, with the second direction Y as the projection direction, the orthographic projection of the pressure relief part 33 and the orthographic projection of the corresponding pressure relief mechanism 214 can completely overlap.

[0173] In some embodiments, the heat insulation assembly 30 may include a first heat insulation member 31, which is provided with a pressure relief portion 33.

[0174] In some embodiments, the heat insulation component 30 may include a second heat insulation element 32, which may be provided with a pressure relief portion 33.

[0175] In some embodiments, the heat insulation component 30 may include a first heat insulation element 31 and a second heat insulation element 32. Both the first heat insulation element 31 and the second heat insulation element 32 are provided with a pressure relief portion 33. One pressure relief portion 33 of the first heat insulation element 31 corresponds to the pressure relief mechanism 214 of a battery cell 21, and one pressure relief portion 33 of the second heat insulation element 32 corresponds to the pressure relief mechanism 214 of a battery cell 21.

[0176] When a thermal runaway occurs in a battery cell 21, the high-temperature material is discharged through the pressure relief mechanism 214 of the battery cell 21. At this time, the corresponding pressure relief part 33 ruptures to discharge the high-temperature material to the side of the heat insulation component 30 away from the first wall 2113.

[0177] The technical solution of this application embodiment reduces the risk of the phase change heat absorption component 40 affecting the pressure relief of the battery cell 21 by setting a pressure relief part 33 corresponding to the pressure relief mechanism 214 in the heat insulation component 30, which is beneficial to improving the reliability of the battery device 1.

[0178] Please refer to Figure 9 In some embodiments, the orthographic projection of the phase change heat absorber 40 along the second direction Y does not overlap with the orthographic projection of the pressure relief mechanism 214.

[0179] In some embodiments, the phase change heat absorber 40 and the pressure relief mechanism 214 are spaced apart. When high-temperature substances are discharged through the pressure relief mechanism 214 of the battery cell 21, the risk of the phase change heat absorber 40 blocking the discharge of high-temperature substances is reduced.

[0180] The technical solution of this application embodiment reduces the risk of the phase change heat absorber 40 affecting the pressure relief of the battery cell 21 by setting the phase change heat absorber 40 to not overlap with the pressure relief mechanism 214, which is beneficial to improving the reliability of the battery device 1.

[0181] Please refer to Figure 4 In some embodiments, the thermal insulation component 30 includes ceramic fibers, alumina fibers, phosphorus-nitrogen intumescent coatings, paraffin wax, or graphene composites.

[0182] In some embodiments, the thermal insulation component 30 may be formed of ceramic fibers.

[0183] In some embodiments, the thermal insulation component 30 may be formed of alumina fibers.

[0184] In some embodiments, the thermal insulation component 30 may be formed of paraffin wax.

[0185] In some embodiments, the thermal insulation component 30 may be formed of a graphene composite.

[0186] In some embodiments, the thermal insulation component 30 may be formed of ceramic fibers and coated with a phosphorus-nitrogen-based expansion coating on the surface of the ceramic fibers.

[0187] The technical solution of this application embodiment has good thermal insulation performance. Ceramic fiber, alumina fiber, phosphorus-nitrogen expansion coating, paraffin or graphene composite has good thermal insulation performance. By selecting ceramic fiber, alumina fiber, phosphorus-nitrogen expansion coating, paraffin or graphene composite to form thermal insulation component 30, it is beneficial to improve the thermal insulation performance of thermal insulation component 30, which can reduce the risk of short circuit caused by the ejected material falling on the first wall 2113 of other battery cells 21, and improve the reliability of battery device 1.

[0188] Please refer to Figure 4 In some embodiments, the phase change heat absorber 40 is made of stearic acid, lauric acid, or porous composite materials.

[0189] In some embodiments, the phase change heat absorber 40 may be formed of stearic acid.

[0190] In some embodiments, the phase change heat absorber 40 may be formed of lauric acid.

[0191] In some embodiments, the phase change heat absorber 40 may be formed of a porous matrix composite material.

[0192] The technical solution of this application embodiment has good phase change heat absorption performance of stearic acid, lauric acid and porous matrix composite material. By selecting stearic acid, lauric acid or porous matrix composite material to form phase change heat absorption component 40, it is beneficial to improve the phase change heat absorption performance of phase change heat absorption component 40, reduce the impact of heat on other battery cells 21, and improve the reliability of battery device 1.

[0193] Please refer to Figures 2 to 4 and refer to Figure 10 , Figure 10 This is a schematic diagram illustrating the cooperation between a receiving member and a phase change heat absorber according to some embodiments of this application. In some embodiments, the battery device 1 further includes a receiving member 60, which is disposed on the side of the heat insulation component 30 away from the first wall 2113, and the phase change heat absorber 40 is disposed within the receiving member 60.

[0194] In some embodiments, the receiving member 60 may be a hollow structure, and the phase change heat absorber 40 is disposed inside the receiving cavity 14.

[0195] In some embodiments, the receiving member 60 may be fixedly connected to the thermal insulation component 30 and connected to the side of the thermal insulation component 30 opposite to the first wall 2113. The receiving member 60 may be connected to the thermal insulation component 30 by means of adhesive bonding, welding, bolting, etc.

[0196] In some embodiments, the container 60 may be made of metal, such as aluminum or copper, so that the container 60 can conduct heat to the phase change heat absorber 40.

[0197] In some embodiments, the material of the containment 60 may also be plastic, rubber, etc., so that high-temperature substances can destroy the containment 60 to release the phase change heat absorber 40.

[0198] The technical solution of this application embodiment reduces the risk of damage to the phase change heat absorber 40 due to interference between the phase change heat absorber 40 and other components of the housing 10, and reduces the risk of heat absorption failure due to the phase change heat absorber 40 moving due to shaking, thereby improving the reliability of the battery device 1.

[0199] Please refer to Figure 1 This application provides an electrical device, including a battery device 1 as described in any of the above embodiments, the battery device 1 being used to provide electrical energy to the electrical device.

[0200] Please refer to Figures 2 to 4 , Figure 6In some embodiments, the battery device 1 includes a housing 10, a battery cell assembly 20, a heat insulation assembly 30, and a phase change heat absorber 40. The housing 10 has a receiving cavity 14. The battery cell assembly 20 is disposed in the receiving cavity 14. The battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially along a first direction X. Each battery cell 21 includes a housing 211, a busbar 215, electrode terminals 213, and a pressure relief mechanism 214. In a second direction Y, the housing 211 has a first wall 2113. The electrode terminals 213 and the pressure relief mechanism 214 are both disposed on the first wall 2113. The busbar 215 connects to the electrode terminals 213 of each battery cell 21. The first direction X is perpendicular to the second direction Y.

[0201] In some embodiments, the thermal insulation component 30 covers the entire portion of the first wall 2113 of each battery cell 21.

[0202] In some embodiments, the heat insulation assembly 30 includes a plurality of first heat insulation members 31, which are disposed on the first wall 2113, and each first heat insulation member 31 covers the entire portion of the first wall 2113 of a battery cell 21. In the second direction Y, the first heat insulation member 31 is located between the first wall 2113 and the current collector 215, and the first heat insulation member 31 is provided with an opening 311 through which the electrode terminal 213 passes for connection with the current collector 215.

[0203] In some embodiments, the heat insulation assembly 30 further includes a second heat insulation member 32 disposed on the busbar 215 and located above the busbar 215, and the first heat insulation member 31 covers the entire portion of the first wall 2113 of all battery cells 21.

[0204] In some embodiments, in the second direction Y, the phase change heat absorber 40 is disposed on the side of the second heat insulation member 32 opposite to the first heat insulation member 31.

[0205] The technical solution of this application embodiment, by setting the heat insulation component 30 to cover the entire first wall 2113 of each battery cell 21, can reduce the risk of ejected material falling onto the first wall 2113 of other battery cells 21 and causing a short circuit when one or more battery cells 21 experience thermal runaway, thus improving the reliability of the battery device 1. By setting the phase change heat absorber 40, when one or more battery cells 21 experience thermal runaway, the heat generated is absorbed by the phase change heat absorber 40, which helps to reduce the impact of heat on other battery cells 21, thus improving the reliability of the battery device 1.

[0206] 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, characterized by, The battery device comprises: a box body having a receiving cavity; a battery cell assembly arranged in the receiving cavity, the battery cell assembly comprising a plurality of battery cells arranged in a first direction in sequence, each battery cell comprising a shell, an electrode terminal and a pressure relief mechanism, the shell having a first wall in a second direction, the electrode terminal and the pressure relief mechanism being arranged on the first wall, the first direction being perpendicular to the second direction; a thermal insulation assembly covering at least part of the first wall of each battery cell; a phase change heat absorption member arranged between the box body and the first wall in the second direction.

2. The battery device according to claim 1, characterized by The thermal insulation assembly covers the entire first wall of each battery cell.

3. The battery device of claim 2, wherein, The thermal insulation assembly comprises a plurality of first thermal insulation members, each first thermal insulation member covering the first wall of one battery cell.

4. The battery device of claim 3, wherein The battery cell assembly further comprises a busbar component electrically connected to the electrode terminals of the plurality of battery cells; In the second direction, a portion of the first thermal insulation member is located between the first wall and the busbar component, the first thermal insulation member is provided with an opening, and the electrode terminal is arranged in the opening.

5. The battery device of claim 1, wherein The battery cell assembly further comprises a busbar component electrically connected to the electrode terminals of the plurality of battery cells; The thermal insulation assembly comprises a second thermal insulation member covering the first wall of each battery cell and the busbar component.

6. The battery device of claim 5, wherein The thermal insulation assembly further comprises a plurality of first thermal insulation members, each first thermal insulation member covering the first wall of one battery cell. The second thermal insulation member is arranged on the side of the first thermal insulation member away from the first wall.

7. The battery device of claim 6, wherein In the second direction, the surface of the second thermal insulation member away from the first thermal insulation member forms a receiving space with the box body, and the phase change heat absorption member is arranged in the receiving space.

8. The battery device of claim 7, wherein, The box body is provided with an exhaust port in communication with the receiving space.

9. The battery device of claim 8, wherein, The phase change heat absorption member extends in the first direction, the number of phase change heat absorption members is multiple, and multiple phase change heat absorption members are arranged at intervals in a third direction, the first direction, the second direction and the third direction being perpendicular to each other. A flow channel is defined between two adjacent phase change heat absorption members, and the flow channel is in communication with the exhaust port.

10. The battery device of claim 1, wherein, The thermal insulation assembly covers the pressure relief mechanism of each battery cell.

11. The battery device of claim 10, wherein, The thermal insulation assembly is provided with a pressure relief portion corresponding to the pressure relief mechanism of each battery cell in the second direction, and the pressure relief portion is configured to be broken to release the pressure relief substance of the battery cell.

12. The battery device of claim 1, wherein, In the second direction, the orthographic projection of the phase change heat absorption member does not overlap with the orthographic projection of the pressure relief mechanism.

13. The battery device of claim 1, wherein, The thermal insulation assembly comprises ceramic fiber, alumina fiber, phosphorus-nitrogen-based expansion coating, paraffin or graphene composite.

14. The battery device of claim 1, wherein, The material of the phase change heat absorption member comprises stearic acid, lauric acid or porous base composite material.

15. The battery device of claim 1, wherein, The battery device further comprises a receiving member arranged on the side of the thermal insulation assembly away from the first wall, and the phase change heat absorption member is arranged in the receiving member.

16. An electrical device, comprising: The battery device as claimed in any one of claims 1-15, wherein the battery device is configured to provide electrical energy to the electrical device.

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