Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device.The battery device comprises battery monomers, heat insulation parts and heat-resistant parts, the multiple battery monomers are stacked in the first direction, the heat insulation parts are arranged between the adjacent battery monomers in the first direction, and the heat-resistant parts are arranged between the adjacent battery monomers in the first direction. The heat-resistant part is arranged between the adjacent battery monomers in the first direction, the heat-resistant part surrounds the peripheral side of the heat-insulating part, and in the first direction, the thickness ratio of the heat-resistant part to the heat-insulating part ranges from 1: 1 to 100: 1. The heat-resistant parts can bear high temperature of areas on the two sides of the single batteries and corrosion of overflowing high-temperature substances, temperature rise of the adjacent single batteries is effectively restrained when the single batteries are in thermal runaway, and the reliability of the battery device is improved. The thickness ratio of the heat-resistant part to the heat-insulating part in the first direction ranges from 1: 1 to 100: 1, and stress can be relieved when the battery monomers expand, so that a good working condition is provided for the battery monomers, and the reliability of the battery device is further improved.

Description

TECHNICAL FIELD

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

[0002] With the development of new energy technology, batteries are applied more and more widely, such as in mobile phones, notebook computers, electric cars, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft and electric tools.

[0003] The reliability of batteries is difficult to meet the demand when thermal runaway occurs. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery device and a power utilization device, which is beneficial to improve the reliability.

[0005] In a first aspect, the present application provides a battery device, comprising a battery monomer, a heat insulation member and a heat-resistant member; a plurality of battery monomers are stacked in a first direction; the heat insulation member is arranged between adjacent battery monomers in the first direction; the heat-resistant member is arranged between adjacent battery monomers in the first direction and encloses the outer periphery of the heat insulation member; wherein, in the first direction, the thickness ratio of the heat-resistant member to the heat insulation member ranges from 1:1 to 100:1.

[0006] In the technical scheme of the present application, the heat insulation member can block heat transfer, and the heat-resistant member encloses the outer periphery of the heat insulation member and can withstand high temperature on both sides of the battery monomer and corrosion of the high-temperature substances overflowing without failure, thereby blocking heat transfer between adjacent battery monomers, effectively inhibiting temperature rise of adjacent battery monomers when the battery monomer is in thermal runaway, and protecting the shell of adjacent battery monomers, thereby inhibiting the chain reaction in thermal runaway and improving the reliability of the battery device. The thickness ratio of the heat-resistant member to the heat insulation member in the first direction ranges from 1:1 to 100:1, which can relieve stress when the battery monomer expands, thereby providing good working conditions for the battery monomer and further improving the reliability of the battery device.

[0007] In some embodiments, in the first direction, the thickness ratio of the heat-resistant member to the heat insulation member ranges from 2:1 to 5:1. In this way, the heat insulation effect of the heat insulation member, the heat resistance of the heat-resistant member, and the thickness difference between the heat-resistant member and the heat insulation member in the first direction can be considered, effectively inhibiting heat transfer between adjacent battery monomers and reserving space for the expansion of the battery monomer.

[0008] In some embodiments, in the first direction, the thickness of the heat-resistant member is T, and the thickness of the heat-insulating member is t, 0 < T ≤ 10 mm, and 0 < t ≤ 10 mm. In this way, the thickness of the heat-resistant member and the heat-insulating member in the first direction are both not more than 10 mm, and the heat-insulating performance and the energy density of the battery device can be considered.

[0009] In some embodiments, the heat-resistant member comprises two horizontal parts, two vertical parts, and a receiving cavity enclosed by the two horizontal parts and the two vertical parts, the heat-insulating member is located in the receiving cavity, and at least one of the horizontal parts and / or the vertical parts is arranged to be spaced apart from the heat-insulating member. In this way, the contact between the heat-insulating member and the heat-resistant member can be reduced, thereby reducing the heat transfer from the heat-insulating member to the heat-resistant member and improving the reliability of the heat-resistant member.

[0010] In some embodiments, the spacing between at least one of the horizontal parts and the heat-insulating member is not less than 10 mm. In this way, the heat transfer between the heat-insulating member and the heat-resistant member can be reduced, further improving the reliability of the heat-resistant member.

[0011] In some embodiments, the thickness of the horizontal part gradually decreases in the direction approaching the heat-insulating member. In this way, space can be reserved for the expansion of the battery cell, the stress between the heat-resistant member and the battery cell can be optimized, and the internal working condition of the battery device can be improved.

[0012] In some embodiments, the thickness of one end of the horizontal part facing the heat-insulating member in the first direction is T1, and the thickness of the other end of the horizontal part away from the heat-insulating member in the first direction is T2, 1:3 ≤ T1:T2 < 1:1. In this way, not only can the temperature distribution of the surface of the battery cell be adapted, but also the reliability of the horizontal part at the thinnest part can be improved.

[0013] In some embodiments, the vertical part is arranged to have an equal thickness or the thickness of the vertical part gradually decreases in the direction approaching the heat-insulating member. In this way, when the vertical part is arranged to have an equal thickness, the heat-resistant performance of the heat-resistant member can be improved; when the thickness of the vertical part gradually decreases in the direction approaching the heat-insulating member, space can be reserved for the expansion of the battery cell.

[0014] In some embodiments, a limiting protrusion is arranged on the vertical part, the limiting protrusion is located in the receiving cavity and abuts against the heat-insulating member. In this way, not only can the limiting protrusion limit the heat-insulating member, but also the contact between the vertical part and the heat-insulating member can be reduced, thereby reducing the heat transfer.

[0015] In some embodiments, the length between the limiting protrusion and the heat-insulating member is not less than 10 mm. In this way, the spacing between the heat-insulating member and the rest of the vertical part is not less than 10 mm, and the heat transfer from the heat-insulating member to the vertical part can be reduced.

[0016] In some embodiments, in the first direction, the limiting protrusion is located in the middle of the longitudinal part. In this way, the limiting protrusion leaves a gap with the adjacent battery cell, which can optimize the stress environment of the battery cell when swelling, and improve the internal working condition of the battery device.

[0017] In some embodiments, in the first direction, the thickness of the limiting protrusion is one fifth to four fifths of the thickness of the part adjacent to the limiting protrusion on the longitudinal part. In this way, not only can space be reserved for the swelling of the battery cell in the first direction, but the structural strength and thickness of the limiting protrusion can also meet the limiting requirements of the heat insulation member.

[0018] In a second aspect, the present application provides a power utilization device comprising the battery device in the above embodiments, which is used to provide electric energy.

[0019] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the contents of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0020] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the present application. Moreover, the same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0021] Figure 1 A simple schematic diagram of a vehicle of some embodiments of the present application;

[0022] Figure 2 A split schematic diagram of a battery device of some embodiments of the present application;

[0023] Figure 3 A split schematic diagram of a battery cell of some embodiments of the present application;

[0024] Figure 4 A schematic diagram of a plurality of battery cells stacked in a first direction of some embodiments of the present application;

[0025] Figure 5 A split schematic diagram of a plurality of battery cells of some embodiments of the present application; Figure 4

[0026] Figure 6 A connection schematic diagram of a heat-resistant member and a battery cell of some embodiments of the present application;

[0027] Figure 7 A connection schematic diagram of a heat-resistant member and a battery cell of some embodiments of the present application; Figure 6 ​A-A is a sectional view;

[0028] Figure 8 Connection diagram of heat-resistant member and battery cell for other embodiments of the present application;

[0029] Figure 9 Connection diagram of heat-resistant member and battery cell for other embodiments of the present application; Figure 8 B-B is a sectional view;

[0030] Figure 10 Connection diagram of heat-resistant member and battery cell for other embodiments of the present application; Figure 8 C-C is a sectional view;

[0031] Figure 11 Measurement point arrangement diagram for battery cell thermal runaway test for some embodiments of the present application;

[0032] Figure 12 Installation diagram for battery cell thermal runaway test for some embodiments of the present application.

[0033] Reference numerals in the detailed description of the embodiments are as follows:

[0034] 1000-vehicle; 100-battery device; 200-controller; 300-motor;

[0035] 10-box; 101-first box; 102-second box;

[0036] 1-battery cell; 11-housing; 12-cover plate; 13-electrode terminal; 14-electrode assembly; 15-pressure relief mechanism; 2-thermal insulation member; 3-heat-resistant member; 31-cross part; 32-longitudinal part; 321-limiting protrusion; 33-receiving cavity;

[0037] 4-measurement point; 5-clamp.

[0038] X-first direction. DETAILED DESCRIPTION

[0039] The embodiments of the technical solutions of the present application will be described in detail below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0042] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0044] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0045] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] At present, from the development of market situation, the application of power battery is more and more widely, power battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0048] In the battery, a plurality of battery cells are stacked, and a heat insulation pad is arranged between adjacent battery cells. The heat insulation pad plays a role of blocking heat transfer between two adjacent battery cells. On the outer circumferential side of the heat insulation pad, a mouth-shaped frame is usually surrounded to protect the heat insulation pad (for example, when the heat insulation pad is an aerogel heat insulation pad, the mouth-shaped frame can protect the aerogel powder from loss).

[0049] In the related art, the mouth-shaped frame is made of silica gel or foam material. When the battery cell is in thermal runaway, the diffused heat will be preferentially transferred to both sides of the battery cell, so that the temperature of the high-temperature area on both sides of the large surface (the surface adhered to the heat insulation pad) of the thermal runaway battery cell is higher, and the temperature of the middle area is lower. The high-temperature area on both sides will melt the mouth-shaped frame, and the heat will be quickly transferred to the adjacent battery cell, causing the temperature of the adjacent battery cell to rise too fast.

[0050] Currently, with the improvement of the demand for endurance, greater power needs to be achieved under the NCM (Nickel Cobalt Manganese) system to meet the endurance demand. NCM has active chemical properties, and the chemical reaction is violent when it is in thermal runaway. At the same time, the increase of the capacity of the battery cell will further cause the temperature rise of thermal runaway to intensify. When the thermal runaway battery cell opens the pressure relief valve for pressure relief, the high-temperature material overflowing from the pressure relief valve will contact the mouth-shaped frame, which will corrode the mouth-shaped frame and cause it to fail. At the same time, the high temperature is transferred to the adjacent battery cell, causing the temperature of the adjacent battery cell to rise too fast, which is easy to produce a chain reaction, causing the battery cells to be in thermal runaway one after another, thereby affecting the reliability of the battery.

[0051] In addition, the shell material of the battery cell is mainly metal aluminum, and its melting point is 660℃ and boiling point is 2327℃. After the thermal runaway temperature exceeds the melting point, the shell of the battery cell is easy to soften and deform. In the NCM system, the thermal runaway temperature can reach more than 1000℃, and after the high-temperature material overflowing from the pressure relief valve corrodes the mouth-shaped frame, it will contact the large surface of the shell, thereby causing damage to the large surface of the adjacent battery cell and causing thermal runaway of the adjacent battery cell.

[0052] In order to improve the reliability of the battery, the mouth-shaped frame between the adjacent battery cells can be improved to improve the heat insulation between the adjacent battery cells, inhibit the chain reaction of the battery cell when it is in thermal runaway, and improve the reliability of the battery.

[0053] Based on the above considerations, the application designs a battery device, which comprises a plurality of stacked battery monomers, a heat insulation member and a heat-resistant member are arranged between adjacent battery monomers, the heat-resistant member is enclosed on the outer peripheral side of the heat insulation member, and the thickness ratio of the heat-resistant member to the heat insulation member is in the range of 1:1 to 100:1.

[0054] In such a battery device, the heat insulation member is located between adjacent battery monomers, which can effectively block heat transfer; the heat-resistant member is enclosed on the outer peripheral side of the heat insulation member, the heat-resistant member is made of heat-resistant material, which can withstand high temperature and corrosion of high-temperature substances when the battery monomer is in thermal runaway without failure, thereby improving the heat insulation capacity between the battery monomers, effectively suppressing the temperature rise of adjacent battery monomers when the battery monomer is in thermal runaway, and protecting the shell of adjacent battery monomers; the thickness of the heat-resistant member is not less than the thickness of the heat insulation member, which can leave space for the expansion of the battery monomer, further reducing the influence of the battery monomer on adjacent battery monomers when in thermal runaway, thereby improving the reliability of the battery device.

[0055] The battery device disclosed in the embodiments of the application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery device disclosed in the application, which helps to improve the reliability.

[0056] The embodiments of the application provide an electric device using the battery device as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0057] The following embodiments are described with a vehicle as an example of an electric device of an embodiment of the application for convenience of description.

[0058] Please refer to Figure 1 , Figure 1 which is a simple schematic diagram of the vehicle of some embodiments of the application.

[0059] The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0060] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0061] Please refer to Figure 2 , Figure 2 Split schematic diagram of the battery device of some embodiments of the present application.

[0062] The battery device 100 includes a box body 10 and a battery cell 1, and the battery cell 1 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery cell 1, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first box body 101 and a second box body 102, and the first box body 101 and the second box body 102 are mutually covered to jointly define a containing space for containing the battery cell 1. The second box body 102 can be a hollow structure with one end open, and the first box body 101 can be a plate-shaped structure, which is covered on the open side of the second box body 102 to jointly define the containing space with the second box body 102. The first box body 101 and the second box body 102 can also be hollow structures with one side open, and the open side of the first box body 101 is covered on the open side of the second box body 102. Of course, the box body 10 formed by the first box body 101 and the second box body 102 can have various shapes, such as a cylinder, a cuboid, etc.

[0063] In the battery device 100, the battery cell 1 can be multiple, and the multiple battery cells 1 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 1 are connected in series and in parallel. The multiple battery cells 1 can be directly connected in series, in parallel, or in a mixed manner, and then the multiple battery cells 1 are accommodated in the box 10. Of course, the battery device 100 can also be that the multiple battery cells 1 are connected in series, in parallel, or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole and are accommodated in the box 10. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 1.

[0064] Each battery cell 1 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0065] Please refer to Figure 3 , Figure 3 for the split schematic diagram of the battery cell 1 of some embodiments of the present application.

[0066] The battery cell 1 refers to the smallest unit of the battery device 100. The battery cell 1 includes a shell 11, a cover plate 12, an electrode terminal 13, an electrode assembly 14, a pressure relief mechanism 15, and other functional components.

[0067] The cover plate 12 refers to a component that covers the opening of the shell 11 to isolate the internal environment of the battery cell 1 from the external environment. Optionally, the cover plate 12 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the cover plate 12 is not easy to deform when subjected to extrusion and collision, so that the battery cell 1 can have higher structural strength, and the safety performance can also be improved. The electrode terminal 13 is installed on the cover plate 12 and can be used for electrical connection with the electrode assembly 14 to output or input the electrical energy of the battery cell 1.

[0068] The shell 11 is a component for cooperating with the cover plate 12 to form the internal environment of the battery cell 1, and the formed internal environment can be used to accommodate the electrode assembly 14, the electrolyte, and other components. The material of the shell 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0069] Electrode assembly 14 is the component in the battery cell 1 where electrochemical reactions occur. Electrode assembly 14 is mainly formed by winding 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 electrode body of electrode assembly 14, while the portions of the positive and negative electrode sheets without active material constitute the positive and negative electrode tabs, respectively. During the charging and discharging process of battery device 100, the positive and negative active materials react with the electrolyte, and the positive and negative electrode tabs connect to electrode terminals 13 to form a current loop.

[0070] A pressure relief mechanism 15 is disposed on the outer casing and is used to discharge internal gases from the battery cell 1. It is actuated when the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold to release the internal pressure or temperature. "Actuation" means that the pressure relief mechanism 15 is activated or brought to a certain state, thereby releasing the internal pressure and temperature of the battery cell 1. The actions of the pressure relief mechanism 15 may include, but are not limited to, movement of components within the pressure relief mechanism 15 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 15, etc. When the pressure relief mechanism 15 is actuated, the high-temperature, high-pressure substances inside the battery cell 1 are discharged outwards from the actuated portion as waste. In this way, the battery cell 1 can be depressurized and de-temperatured under controllable pressure or temperature, thereby preventing potentially more serious accidents. Waste includes, but is not limited to, electrolytes, dissolved or broken positive and negative electrode plates, fragments of separators, high-temperature, high-pressure gases generated by the reaction, flames, etc.

[0071] Please refer to Figures 4 to 7 , Figure 4 This is a schematic diagram of multiple battery cells stacked in a first direction according to some embodiments of this application; Figure 5 For this application Figure 4 A schematic diagram showing the breakdown of multiple battery cells; Figure 6 This is a schematic diagram showing the connection between the heat-resistant component and the battery cell in some embodiments of this application; Figure 7 For this application Figure 6 Sectional view at AA;

[0072] According to some embodiments of this application, this application provides a battery device 100, which includes a battery cell 1, a heat insulation component 2, and a heat-resistant component 3; a plurality of battery cells 1 are stacked in a first direction X; the heat insulation component 2 is disposed between adjacent battery cells 1 in the first direction X; the heat-resistant component 3 is disposed between adjacent battery cells 1 in the first direction X and surrounds the outer periphery of the heat insulation component 2; wherein, in the first direction X, the thickness ratio of the heat-resistant component 3 to the heat insulation component 2 ranges from 1:1 to 100:1.

[0073] The heat insulation piece 2 is in the shape of a sheet, which can be a rectangular sheet, and is located between adjacent battery monomers 1 in the first direction X, and can block heat transfer between the large faces of adjacent battery monomers 1. In the first direction X, the thickness of the heat insulation piece 2 is not more than the thickness of the heat-resistant piece 3. When the thicknesses of the two are equal, the heat insulation piece 2 is attached to both adjacent battery monomers 1; when the thickness of the heat insulation piece 2 is less than the thickness of the heat-resistant piece 3, the heat insulation piece 2 is attached to one of the two adjacent battery monomers 1, and is spaced apart from the other, which can provide space for the expansion of the battery monomer 1.

[0074] The heat-resistant piece 3 is in the shape of a frame and surrounds the outer circumferential side of the heat insulation piece 2. The heat-resistant piece 3 is made of a material that can withstand high temperatures, and the material can be, for example, any one of gel, glass cloth, glass fiber, ceramic fiber, rock wool, or a composite layer material formed by any two or more of the above materials.

[0075] The heat-resistant piece 3 can be bonded to the adjacent battery monomers 1, or can be fixedly connected to the battery monomers 1 only by the pressure from the two adjacent battery monomers 1. The heat insulation piece 2 can be bonded to the adjacent battery monomers 1, or can be limited by the heat-resistant piece 3, or can be freely movable in the closed space formed by the two adjacent battery monomers 1 and the heat-resistant piece 3.

[0076] The thickness ratio of the heat-resistant piece 3 to the heat insulation piece 2 in the first direction X can be 1:1, 10:1, 20:1, 30:1, 40:1, 50:1, 60:1, 70:1, 80:1, 90:1, 100:1, or any intermediate ratio between any two adjacent ratios.

[0077] The thickness of the heat-resistant piece 3 and the heat insulation piece 2 in the first direction X can be implemented in various ways. When the thickness of the heat-resistant piece 3 is greater than the thickness of the heat insulation piece 2, it can be implemented by increasing the thickness of the heat-resistant piece 3, or by decreasing the thickness of the heat insulation piece 2, or by decreasing the thickness of the heat insulation piece 2 while increasing the thickness of the heat-resistant piece 3. When the thickness of the heat-resistant piece 3 is equal to the thickness of the heat insulation piece 2, the thickness of the heat-resistant piece 3 and the thickness of the heat insulation piece 2 can be increased simultaneously, or the thickness of the heat-resistant piece 3 and the thickness of the heat insulation piece 2 can be decreased simultaneously.

[0078] Exemplarily, the thickness of the heat insulation member 2 is referred to the thickness of the heat insulation pad in the related art, and the thickness of the heat resistant member 3 is referred to the thickness of the mouth-shaped frame in the related art. When the thickness of the heat resistant member 3 is greater than the thickness of the heat insulation member 2, the heat resistant member 3 can increase the thickness relative to the mouth-shaped frame; the heat insulation member 2 can decrease the thickness relative to the heat insulation pad; or the heat resistant member 3 can increase the thickness relative to the mouth-shaped frame, and the heat insulation member 2 can decrease the thickness relative to the heat insulation pad. When the thickness of the heat resistant member 3 is equal to the thickness of the heat insulation member 2, the heat insulation member 2 can increase or decrease the thickness relative to the heat insulation pad, and the heat resistant member 3 can increase or decrease the thickness relative to the mouth-shaped frame, or the heat insulation member 2 and the heat resistant member 3 can have the same thickness as the heat insulation pad and the mouth-shaped frame, respectively.

[0079] In the technical scheme of the embodiments of the present application, the battery device includes the battery monomer 1, the heat insulation member 2 and the heat resistant member 3, and the heat resistant member 3 and the heat insulation member 2 are located between adjacent battery monomers 1. The heat insulation member 2 can block heat transfer, and the heat resistant member 3 is surrounded by the outer peripheral side of the heat insulation member 2 and can withstand the high temperature of the two side regions of the battery monomer 1 and the corrosion of the high temperature substances overflowing from the explosion-proof valve (pressure relief mechanism 15) without failure, thereby blocking the heat transfer between adjacent battery monomers 1, effectively inhibiting the temperature rise of adjacent battery monomers 1 when the battery monomer 1 is in thermal runaway, and protecting the shell 11 of the adjacent battery monomer 1, thereby inhibiting the chain reaction in thermal runaway and improving the reliability of the battery device. Moreover, the thickness ratio of the heat resistant member 3 to the heat insulation member 2 in the first direction X is in the range of 1:1 to 100:1, which can relieve stress when the battery monomer 1 expands, thereby providing good working conditions for the battery monomer 1 and further improving the reliability of the battery device.

[0080] As shown in FIGS. 1, 2 and 3, according to some embodiments of the present application, the thickness ratio of the heat resistant member 3 to the heat insulation member 2 in the first direction X is in the range of 2:1 to 5:1. Figure 6 Figure 7 As shown in FIGS. 1, 2 and 3, according to some embodiments of the present application, the thickness ratio of the heat resistant member 3 to the heat insulation member 2 in the first direction X is in the range of 2:1 to 5:1.

[0081] In the first direction X, the thickness of the heat insulation member 2 in each region can be the same or different; the thickness of the heat resistant member 3 in each region can be the same or different. The thickness of the heat insulation member 2 and the heat resistant member 3 is compared based on the maximum thickness in all regions.

[0082] In the first direction X, the thickness of the heat resistant member 3 is greater than the thickness of the heat insulation member 2. The thickness ratio of the heat resistant member 3 to the heat insulation member 2 can be any one of 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, or any intermediate ratio between any two adjacent ratios.

[0083] ​In the technical solution of this application embodiment, the thickness ratio of the heat-resistant component 3 to the heat-insulating component 2 in the first direction X is in the range of 2:1 to 5:1. Within this range, the heat insulation effect of the heat-insulating component 2, the heat resistance performance of the heat-resistant component 3, and the thickness difference between the heat-resistant component 3 and the heat-insulating component 2 in the first direction X can be taken into account, thereby effectively suppressing the heat transfer between adjacent battery cells 1 and reserving space for the expansion of the battery cells 1.

[0084] like Figure 6 and Figure 7 As shown, according to some embodiments of this application, optionally, in the first direction X, the thickness of the heat-resistant member 3 is T, the thickness of the heat-insulating member 2 is t, 0 < T ≤ 10 mm, and 0 < t ≤ 10 mm.

[0085] The thickness T of the heat-resistant component 3 in the first direction X refers to the maximum thickness of the heat-resistant component 3 in the first direction X. When the heat-resistant component 3 is arranged with a uniform thickness in the first direction X, T is also the average thickness of the heat-resistant component 3. The thickness t of the heat insulation component 2 in the first direction X refers to the maximum thickness of the heat insulation component 2 in the first direction X. When the heat insulation component 2 is arranged with a uniform thickness in the first direction X, t is also the average thickness of the heat insulation component 2.

[0086] The values ​​of T and / or t can be any value from 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, and 10mm, or any intermediate value between any two adjacent values ​​mentioned above. The values ​​of T and t can be the same or different, and t ≤ T.

[0087] In the technical solution of this application embodiment, the thickness of the heat-resistant component 3 and the heat-insulating component 2 in the first direction X does not exceed 10mm, which can take into account both heat insulation performance and energy density of battery device.

[0088] Ideally, 1≤T≤5mm, 1≤t≤5mm, and t≤T can further coordinate the requirements for thermal insulation performance and the energy density requirements of the battery.

[0089] Please refer to Figures 8 to 10 , Figure 8 This is a schematic diagram showing the connection between the heat-resistant component and the battery cell in some other embodiments of this application; Figure 9 For this application Figure 8 Sectional view at BB; Figure 10 For this application Figure 8 Sectional view at CC.

[0090] According to some embodiments of this application, optionally, the heat-resistant component 3 includes two horizontal portions 31, two vertical portions 32, and a receiving cavity 33 formed by the two horizontal portions 31 and the two vertical portions 32, the heat insulation component 2 is located in the receiving cavity 33, and at least one of the horizontal portions 31 and / or the vertical portions 32 is spaced apart from the heat insulation component 2.

[0091] The heat insulation element 2 can be spaced apart from one horizontal part 31. In addition, the heat insulation element 2 can be spaced apart from one vertical part 32, or it can be spaced apart from both vertical parts 32. The heat insulation element 2 can be spaced apart from both horizontal parts 31. In addition, the heat insulation element 2 can be spaced apart from one vertical part 32, or it can be spaced apart from both vertical parts 32. The heat insulation element 2 can be spaced apart from only one horizontal part 31. The heat insulation element 2 can be spaced apart from only two horizontal parts 31. The heat insulation element 2 can be spaced apart from only one vertical part 32. The heat insulation element 2 can be spaced apart from only two vertical parts 32.

[0092] In the technical solution of this application embodiment, the heat insulation component 2 is located in the accommodating cavity 33 and is spaced apart from at least one horizontal part 31 and / or vertical part 32, which can reduce the contact between the heat insulation component 2 and the heat-resistant component 3, thereby reducing the heat transfer from the heat insulation component 2 to the heat-resistant component 3 and improving the reliability of the heat-resistant component 3.

[0093] like Figure 8 As shown, according to some embodiments of this application, optionally, the distance between at least one horizontal portion 31 and the heat insulation member 2 is not less than 10 mm.

[0094] The heat insulation element 2 can be spaced at least 10 mm from one horizontal part 31, and the heat insulation element 2 can also be spaced at least 10 mm from two horizontal parts 31. The interval between the heat insulation element 2 and the horizontal part 31 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0095] In the technical solution of this application embodiment, the distance between the heat insulation component 2 and at least one horizontal part 31 is not less than 10mm, which can reduce the heat transfer between the heat insulation component 2 and the heat-resistant component 3, thereby reducing the heat of the heat-resistant component 3 and further improving the reliability of the heat-resistant component 3.

[0096] like Figure 9 As shown, according to some embodiments of this application, optionally, the thickness of the transverse portion 31 gradually decreases along the direction approaching the heat insulation member 2.

[0097] When the thickness of the horizontal part 31 gradually decreases along the direction close to the heat insulation member 2, it can be that the thickness of one horizontal part 31 gradually decreases, or the thickness of both horizontal parts 31 gradually decreases. When the thickness of both horizontal parts 31 gradually decreases, the form of thickness reduction can be the same or different.

[0098] Along the direction approaching the heat insulation element 2, the thickness of the horizontal portion 31 can decrease linearly or non-linearly. When the thickness of the horizontal portion 31 decreases non-linearly, the rate of decrease can gradually increase, the rate of decrease can gradually decrease, the rate of decrease can first increase and then decrease, or the rate of decrease can first decrease and then increase.

[0099] Preferably, the thickness of the two transverse portions 31 decreases linearly along the direction close to the heat insulation component 2, and the magnitude of the linear decrease is consistent. This not only facilitates the molding of the heat-resistant component 3, but also improves the interchangeability of the two transverse portions 31 and facilitates assembly.

[0100] In the technical solution of this application embodiment, the thickness of the horizontal part 31 gradually decreases along the direction close to the heat insulation member 2, which can reserve space for the expansion of the battery cell 1 and can conform to the expansion form of the battery cell 1 protruding outward from the middle, thereby optimizing the stress between the heat-resistant member 3 and the battery cell 1 and improving the internal working conditions of the battery device.

[0101] like Figure 9 As shown, according to some embodiments of this application, optionally, the thickness of the end of the horizontal portion 31 facing the heat insulation member 2 in the first direction X is T1, and the thickness of the end of the horizontal portion 31 facing away from the heat insulation member 2 in the first direction X is T2, 1:3≤T1:T2<1:1.

[0102] The end of the horizontal portion 31 facing the heat insulation member 2 is the point where the thickness of the horizontal portion 31 is the smallest in the first direction X, and the end of the horizontal portion 31 facing away from the heat insulation member 2 is the point where the thickness of the horizontal portion 31 is the largest in the first direction X. The ratio of T1 to T2 can be 1:3, 1:2, 2:3, 3:4, 4:5, 5:6, 6:7, etc.

[0103] In the technical solution of this application embodiment, the thickness of the horizontal part 31 gradually decreases along the direction close to the heat insulation member 2, which can adapt to the temperature distribution on the surface of the battery cell 1. On this basis, the ratio of T1 to T2 is not less than 1:3, which can improve the reliability of the horizontal part 31 at the weak point (the point with the smallest thickness).

[0104] like Figure 8 As shown, according to some embodiments of this application, optionally, the longitudinal portion 32 is provided with a uniform thickness along the direction close to the heat insulation member 2, or the thickness of the longitudinal portion 32 gradually decreases.

[0105] Along the direction close to the heat insulation member 2, the thickness of the longitudinal portion 32 in the first direction X can be either constant or gradually decreasing. Preferably, the longitudinal portion 32 is of constant thickness in the first direction X, which can improve the heat resistance of the heat-resistant member 3.

[0106] In the technical solution of the embodiment of the present application, the longitudinal portion 32 can be arranged with equal thickness, thereby improving the heat resistance of the heat-resistant member 3; the longitudinal portion 32 can also gradually decrease in thickness along the direction close to the heat-insulating member 2, thereby reserving space for the expansion of the battery monomer 1 and improving the stress between the battery monomer 1 and the heat-resistant member 3.

[0107] As shown in Figure 8 According to some embodiments of the present application, optionally, a limiting protrusion 321 is arranged on the longitudinal portion 32, and the limiting protrusion 321 is located in the accommodating cavity 33 and abuts against the heat-insulating member 2.

[0108] The limiting protrusion 321 is located on the end surface of the longitudinal portion 32 facing the heat-insulating member 2 and extends in the accommodating cavity 33 towards the heat-insulating member 2 until abutting against the heat-insulating member 2. In the first direction X, the thickness of the limiting protrusion 321 can be the same as the thickness of other regions of the longitudinal portion 32, or can be different. Along the direction close to the heat-insulating member 2, the thickness of the limiting protrusion 321 can change (for example, gradually increase or gradually decrease), or can remain unchanged.

[0109] Preferably, limiting protrusions 321 are arranged on both longitudinal portions 32 and abut against the heat-insulating member 2 through the limiting protrusions 321.

[0110] In the technical solution of the embodiment of the present application, the longitudinal portion 32 abuts against the heat-insulating member 2 through the limiting protrusion 321, which not only provides limiting for the heat-insulating member 2 and restricts the displacement of the heat-insulating member 2 in the direction of the line connecting the two longitudinal portions 32, but also reduces the contact with the heat-insulating member 2, thereby reducing the heat transfer.

[0111] As shown in Figure 8 According to some embodiments of the present application, optionally, the length of the limiting protrusion 321 between the heat-insulating member 2 and the longitudinal portion 32 is not less than 10 mm.

[0112] The heat-insulating member 2 can be in a free state (not fixedly connected with the adjacent battery monomer 1) when located in the accommodating cavity 33 and is only limited by the limiting protrusion 321. The length of the limiting protrusion 321 extending from the end of the longitudinal portion 32 facing the heat-insulating member 2 to the heat-insulating member 2 in the free state is not less than 10 mm. Exemplarily, the length can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc. When extending to abut against the heat-insulating member 2, the heat-insulating member 2 can be in a natural state or in a state of being pressed (subjected to the pressure from the heat-insulating member 2).

[0113] In the technical solution of the embodiment of the present application, the length of the limiting protrusion 321 between the heat-insulating member 2 and the longitudinal portion 32 is not less than 10 mm, and the spacing between the heat-insulating member 2 and the rest of the longitudinal portion 32 is not less than 10 mm, which can reduce the heat transferred from the heat-insulating member 2 to the longitudinal portion 32.

[0114] As shown in Figure 10As shown, according to some embodiments of this application, optionally, in the first direction X, the limiting protrusion 321 is located in the middle of the longitudinal portion 32.

[0115] In the first direction X, the limiting protrusions 321 are symmetrically distributed on the longitudinal portion 32; and the thickness of the limiting protrusions 321 is less than the thickness of the longitudinal portion 32, and the limiting protrusions 321 and the adjacent battery cell 1 are separated by a gap in the first direction X.

[0116] In the technical solution of this application embodiment, the limiting protrusion 321 is located in the middle of the longitudinal portion 32 in the first direction X, and has a gap with the adjacent battery cell 1. When the battery cell 1 expands, the resistance from the limiting protrusion 321 can be reduced, thereby optimizing the force environment when the battery cell 1 expands and improving the internal working conditions of the battery device.

[0117] like Figure 10 As shown, according to some embodiments of this application, optionally, in the first direction X, the thickness of the limiting protrusion 321 is one-fifth to four-fifths of the thickness of the portion of the longitudinal portion 32 adjacent to the limiting protrusion 321.

[0118] In the first direction X, the thickness of the limiting protrusion 321 is less than the thickness of the longitudinal portion 32 and the portion adjacent to the limiting protrusion 321. The limiting protrusion 321 forms a step at the junction with its adjacent portion. The limiting protrusion 321 forms a gap away from the battery cell 1 in the first direction X.

[0119] In the first direction X, the thickness of the limiting protrusion 321 refers to the maximum thickness of the limiting protrusion 321, and the thickness of the portion of the longitudinal portion 32 adjacent to the limiting protrusion 321 refers to the maximum thickness at the adjacent portion. The thickness of the limiting protrusion 321 can be any value among one-fifth, two-fifths, three-fifths, and four-fifths of the thickness of the portion of the longitudinal portion 32 adjacent to the limiting protrusion 321, or any intermediate value between any two adjacent values ​​mentioned above.

[0120] Preferably, the limiting protrusion 321 is provided with equal thickness from the end face of the longitudinal portion 32 toward the heat insulation member 2 to the heat insulation member 2.

[0121] In the technical solution of this application embodiment, the thickness of the limiting protrusion 321 in the first direction X is one-fifth to four-fifths of the thickness of the part adjacent to the limiting protrusion 321 on the longitudinal part 32. The thickness of the limiting protrusion 321 is within this range, which not only reserves space for the expansion of the battery cell 1 in the first direction X and reduces the stress between the longitudinal part 32 and the battery cell 1, but also makes the structural strength and thickness of the limiting protrusion 321 meet the limiting requirements of the heat insulation component 2.

[0122] like Figure 5As shown, according to some embodiments of this application, optionally, in the first direction X, there are multiple heat insulation components 2 and heat-resistant components 3 between two adjacent battery cells 1, and the quantities correspond one-to-one.

[0123] For example, in the first direction X, between two adjacent battery cells 1, the number of heat insulation components 2 and heat-resistant components 3 can be 2, 3, 4, 5, 6, etc.

[0124] Preferably, there are two heat insulation components 2 and two heat-resistant components 3 between two adjacent battery cells 1 in the first direction X. That is, one heat insulation component 2 and one heat-resistant component 3 are provided on each of the two large surfaces of each battery cell 1. This not only improves the heat insulation effect between battery cells 1, but also facilitates the assembly of battery cells 1.

[0125] In the technical solution of this application embodiment, there are multiple heat insulation components 2 and heat-resistant components 3 between two adjacent battery cells 1 in the first direction X, and they correspond one-to-one, which can improve the heat insulation effect between battery cells 1, thereby improving the reliability of the battery device.

[0126] According to some embodiments of this application, this application also provides an electrical device, including a battery device 100 of any of the above schemes, the battery device 100 being used to provide electrical energy to the electrical device.

[0127] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0128] like Figures 5 to 10 As shown, according to some embodiments of this application, this application provides a battery device, which includes a plurality of battery cells 1 stacked in a first direction X, and a heat insulation member 2 and a heat-resistant member 3 disposed between adjacent battery cells 1, the heat-resistant member 3 surrounding the outer periphery of the heat insulation member 2. The heat-resistant member 3 is made of a heat-resistant material, such as gel, fiberglass cloth, glass fiber, ceramic fiber, rock wool, etc. In the first direction X, the thickness of the heat-resistant member 3 is greater than the thickness of the heat insulation member 2. On the periphery of the heat insulation member 2, the heat-resistant member 3 is spaced apart from the heat insulation member 2 (the heat-resistant member 3 can also abut against the heat insulation member 2 through a limiting protrusion 321, thereby limiting the heat insulation member 2), the spacing being not less than 10 mm.

[0129] In the technical solution of the embodiments of the present application, the heat-resistant piece 3 is made of heat-resistant material, can withstand the temperature when the battery monomer 1 is in thermal runaway and the corrosion of high-temperature substances overflowing from the explosion-proof valve, thereby blocking the heat transfer between adjacent battery monomers 1. The thickness of the heat-resistant piece 3 in the first direction X is greater than the thickness of the heat insulation piece 2, which can reserve space for the expansion of the battery monomer 1, thereby relieving the stress when the battery monomer 1 expands and providing a good working condition for the battery monomer 1. The heat-resistant piece 3 is spaced apart from the heat insulation piece 2, and the spacing is not less than 10 mm, which can reduce the heat transferred from the heat insulation piece 2 to the heat-resistant piece 3 when the battery monomer 1 is in thermal runaway, thereby improving the reliability of the heat-resistant piece 3. By setting the thickness difference with the heat insulation piece 2, selecting heat-resistant material, and spacing apart from the heat insulation piece 2, the heat-resistant piece 3 can suppress the temperature rise of adjacent battery monomers 1 when the battery monomer 1 is in thermal runaway, thereby improving the reliability of the battery device.

[0130] In addition, please refer to Figure 11 and Figure 12 , Figure 11 the measurement point arrangement diagram of the battery monomer thermal runaway test of some embodiments of the present application; Figure 12 the installation diagram of the battery monomer thermal runaway test of some embodiments of the present application.

[0131] The battery monomer 1 thermal runaway test of the present application is as follows:

[0132] A plurality of groups of test samples are set, a plurality of battery monomers 1 are set in each group of test samples, and one battery monomer 1 is selected in each group as a test battery monomer 1. The test battery monomer 1 is kept in a full charge state, the temperature is kept at 25±3℃, and a busbar (such as a soft tab) is welded on the top cover and the electrode terminal 13 of the test battery monomer 1. A temperature sensing wire is arranged on the test battery monomer 1, and the arrangement of the measurement point 4 is as shown in Figure 11 and Figure 12 A voltage measurement wire is arranged on the test battery monomer 1, and the voltage between the positive electrode and the negative electrode, the voltage from the positive electrode to the shell 11, and the voltage from the negative electrode to the shell 11 are measured (the interval of the two times of collection is not more than 0.1 seconds). Each group of test samples is stacked and clamped by a clamp 5, the clamping force of the clamp 5 is 3000N, the upper surface of the clamp 5 is flush with the cover plate 12 of the battery monomer 1, and the bottom of the battery monomer 1 is suspended (the suspended height is not less than 5mm).

[0133] During the test: step one, 60℃ for 5h; step two, the temperature rise rate is controlled to be 5℃ / min, and every 5℃ rise is kept for 30min, and the test battery monomer 1 is heated (heating pieces are arranged on two large faces to heat), so that it occurs thermal runaway. Step three, stand for 1h.

[0134] The first to fourth groups of samples: the thickness of the heat insulation member 2 is 3.2 mm, the thickness of the heat resistant member 3 is 5.2 mm, and the material of the heat resistant member 3 uses gel, glass fiber, ceramic fiber, and rock wool respectively as samples. The test results of the four groups of samples are all passed, the adjacent battery monomer 1 of the thermal runaway battery monomer 1 does not occur thermal runaway, and the heat resistant member 3 does not deform and fail.

[0135] The fifth group of samples: the thickness of the heat insulation member 2 is 5.2 mm, the thickness of the heat resistant member 3 is 3.2 mm, and the material of the heat resistant member 3 uses gel as a sample. The test result of the sample is not passed, the adjacent battery monomer 1 of the thermal runaway battery monomer 1 occurs thermal runaway, and the heat resistant member 3 fails.

[0136] The sixth group of samples: the thickness of the heat insulation member 2 is 3.2 mm, the thickness of the heat resistant member 3 is 3.2 mm, and the material of the heat resistant member 3 uses gel as a sample. The test result of the sample is not passed, the adjacent battery monomer 1 of the thermal runaway battery monomer 1 occurs thermal runaway, and the heat resistant member 3 fails.

[0137] The seventh group of samples: the thickness of the heat insulation member 2 is 2.2 mm, the thickness of the heat resistant member 3 is 5.2 mm, and the material of the heat resistant member 3 uses silica gel as a sample. The test result of the sample is not passed, the adjacent battery monomer 1 of the thermal runaway battery monomer 1 occurs thermal runaway, and the heat resistant member 3 fails.

[0138] The eighth group of samples: the thickness of the heat insulation member 2 is 2.2 mm, the thickness of the heat resistant member 3 is 5.2 mm, and the material of the heat resistant member 3 uses foam as a sample. The test result of the sample is not passed, the adjacent battery monomer 1 of the thermal runaway battery monomer 1 occurs thermal runaway, and the heat resistant member 3 fails.

[0139] The comprehensive test results are analyzed: in the first to fourth groups, the heat resistant member 3 adopts a heat resistant material, and the thickness is greater than the thickness of the heat insulation member 2, which can meet the use requirements; in the fifth to sixth groups, the thickness of the heat resistant member 3 does not exceed the thickness of the heat insulation member 2, and when the thickness is the same, the thickness of both is small (3.2 mm), which cannot meet the use requirements; in the seventh to eighth groups, although the thickness of the heat resistant member 3 is greater than the thickness of the heat insulation member 2, the material is not heat resistant, which cannot meet the use requirements.

[0140] Therefore, in the battery device of the present application, the heat resistant member 3 adopts a heat resistant material, and the thickness is not less than the thickness of the heat insulation member 2, which can inhibit the chain reaction of the battery monomer 1 when the battery monomer 1 is in thermal runaway, thereby improving the reliability of the battery device.

[0141] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present 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 plurality of battery cells stacked in a first direction; a thermal insulation member arranged between adjacent battery cells in the first direction; a heat-resistant member arranged between adjacent battery cells in the first direction and enclosing an outer periphery of the thermal insulation member; wherein, in the first direction, a thickness ratio of the heat-resistant member to the thermal insulation member ranges from 1:1 to 100:

1.

2. The battery device according to claim 1, characterized by In the first direction, a thickness ratio of the heat-resistant member to the thermal insulation member ranges from 2:1 to 5:

1.

3. The battery device of claim 1, wherein In the first direction, a thickness of the heat-resistant member is T, and a thickness of the thermal insulation member is t, 0 4. The battery device according to any one of claims 1 to 3, characterized by, The heat-resistant member comprises two horizontal portions, two vertical portions, and a receiving cavity enclosed by the two horizontal portions and the two vertical portions, the thermal insulation member is located in the receiving cavity, and at least one of the horizontal portions and / or the vertical portions is arranged apart from the thermal insulation member.

5. The battery device of claim 4, wherein, A distance between at least one of the horizontal portions and the thermal insulation member is not less than 10 mm.

6. The battery device of claim 4, wherein In a direction approaching the thermal insulation member, a thickness of the horizontal portion gradually decreases.

7. The battery device of claim 4, wherein A thickness of one end of the horizontal portion facing the thermal insulation member in the first direction is T1, and a thickness of the other end of the horizontal portion away from the thermal insulation member in the first direction is T2, 1:3≤T1:T2<1:

1.

8. The battery device of claim 4, wherein In a direction approaching the thermal insulation member, the vertical portion is arranged with an equal thickness, or a thickness of the vertical portion gradually decreases.

9. The battery device of claim 4, wherein, The vertical portion is provided with a limiting protrusion, the limiting protrusion is located in the receiving cavity and abuts against the thermal insulation member.

10. The battery device of claim 9, wherein, A length between the limiting protrusion and the thermal insulation member is not less than 10 mm.

11. The battery device according to claim 9 or 10, characterized by In the first direction, the limiting protrusion is located in a middle portion of the vertical portion.

12. The battery device of claim 9, wherein, In the first direction, a thickness of the limiting protrusion is one-fifth to four-fifths of a thickness of a portion adjacent to the limiting protrusion on the vertical portion.

13. An electrical device, comprising: The battery device is used for providing electric energy.

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