Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device. The battery device comprises a box body; the at least one battery monomer assembly is arranged in the box body, the battery monomer assembly comprises a battery monomer row and a pair of side supporting plates, the battery monomer row comprises a plurality of battery monomers arranged along a first direction, and each battery monomer comprises an anti-explosion valve positioned at at least one end along a second direction; the pair of side supporting plates are respectively supported on the two sides of the battery monomer row along a second direction, the second direction is perpendicular to the first direction, and the side supporting plate positioned on the same side of the explosion-proof valve is provided with a vent hole and an exhaust port communicated with the vent hole in the pair of side supporting plates; and the protection plate is arranged on the outer side surface, far away from the battery monomer, of the side supporting plate, an exhaust channel is formed between the protection plate and the side supporting plate, and the exhaust channel is respectively communicated with the vent hole and the exhaust port.

Description

Technical Field

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

[0002] At present, new energy battery devices are increasingly widely used in life and industry. New energy battery devices are not only applied to energy storage power systems such as hydroelectric power plants, thermal power plants, wind power plants, and solar power plants, but also widely applied to electric transportation means such as electric bicycles, electric motorcycles, and electric vehicles, as well as multiple fields such as aerospace. With the continuous expansion of the application fields of battery devices, the market demand for them is also continuously increasing.

[0003] A battery device usually includes battery cells. When a thermal runaway occurs in a battery cell, how to reduce the damage degree of the battery device is a current research topic. In addition, the industry also puts forward higher requirements for the volume utilization rate of battery devices. Summary of the Utility Model

[0004] To solve the above technical problems, embodiments of this application provide a battery device and an electrical device, which can reduce the damage degree of the battery device when a thermal runaway occurs in a battery cell, and can also improve the volume utilization rate.

[0005] Embodiments of this application are implemented through the following technical solutions.

[0006] A first aspect of embodiments of this application provides a battery device, including: a box body; at least one battery cell assembly disposed in the box body, the battery cell assembly including a battery cell row and a pair of side support plates, the battery cell row including a plurality of battery cells arranged along a first direction, each battery cell including an explosion-proof valve located at at least one end along a second direction, the pair of side support plates respectively supporting both sides of the battery cell row along the second direction, the second direction being perpendicular to the first direction, and among the pair of side support plates, the side support plate located on the same side as the explosion-proof valve is provided with a ventilation hole and an exhaust port communicated with the ventilation hole; a protection plate disposed on the outer side of the side support plate away from the battery cell, and an exhaust channel is formed between the protection plate and the side support plate, and the exhaust channel is respectively communicated with the ventilation hole and the exhaust port.

[0007] By forming an exhaust passage between the side support plate supporting the battery cell and the protection plate, when the battery cell undergoes thermal runaway, the protection plate can block the impact during the gas eruption of the explosion-proof valve, and the gas can erupt directionally through the exhaust passage, thereby reducing the risk of gas thermal diffusion, and further reducing the degree of damage to the battery device; in addition, since the exhaust passage is formed by the mutual cooperation of the side support plate and the protection plate, there is no need to arrange an additional exhaust passage in the box body, so the space occupation can be reduced, thereby improving the volume utilization rate, which helps to improve the volumetric energy density of the battery device.

[0008] In some embodiments, ribs are provided on the outer side surface of the side support plate on the same side as the explosion-proof valve. The ribs extend from one side to the other side in the third direction of the side support plate. The ribs are located between the side support plate and the protection plate, and the exhaust passage is formed in the space surrounded by the ribs, the side support plate and the protection plate. The third direction is perpendicular to the first direction and the second direction.

[0009] The arrangement of the ribs can block the high-temperature gas erupted by the explosion-proof valve in the exhaust passage, so that the high-temperature gas is discharged directionally along the exhaust passage. Thus, the risk of the high-temperature gas thermally diffusing to surrounding components can be reduced, and further the degree of damage to the entire battery device can be reduced.

[0010] In some embodiments, a plurality of the ribs are provided, and a plurality of the exhaust passages are formed between the side support plate and the protection plate. Each of the exhaust passages is separated by the ribs, and each of the exhaust passages is communicated with one of the exhaust ports.

[0011] The plurality of exhaust passages are separated by the ribs into independent channels. When the high-temperature gas erupted by the explosion-proof valve corresponding to a certain exhaust passage will not flow to other exhaust passages, the risk that the components in other exhaust passages are thermally affected is reduced.

[0012] In some embodiments, in the side support plate, a part located in one of the exhaust passages is provided with a plurality of ventilation holes, and the plurality of ventilation holes are provided corresponding to the plurality of explosion-proof valves one by one.

[0013] Thus, a plurality of explosion-proof valves can share one exhaust passage, reducing the number of ribs provided on the side support plate, which helps to lighten the weight of the entire battery device and reduce the cost.

[0014] In some embodiments, in the same projection plane perpendicular to the second direction, the projection of the explosion-proof valve and the projection of the ventilation hole at least partially overlap.

[0015] Thus, the high-temperature gas erupted by the explosion-proof valve can smoothly enter the exhaust passage through the ventilation hole and be discharged through the exhaust port, reducing the risk of the high-temperature gas entering the interior of the battery cell row.

[0016] In some embodiments, the side support plate is provided with an electrode terminal through hole and the vent hole at a position corresponding to one of the battery cells, and a portion of the side support plate located between the electrode terminal through hole and the vent hole forms a shielding portion, and the shielding portion breaks relative to other portions of the side support plate when the battery cell is in a thermal runaway state.

[0017] The shielding portion can protect the explosion-proof valve and at the same time, when the battery cell is in thermal runaway, it can also be destroyed by the high-temperature gas ejected from the explosion-proof valve, thereby allowing the high-temperature gas to flow out smoothly.

[0018] In some embodiments, the vent hole includes a plurality of sub-vent holes spaced apart from each other, the shielding portion is connected to other portions of the side support plate via a weak portion, and the weak portion is located between the sub-vent holes and between the sub-vent holes near the electrode terminal through hole and the electrode terminal through hole.

[0019] By having a weak portion on the side support plate, when thermal runaway occurs in the battery cell, the shielding portion can be more easily broken through the weak portion, so that the high-temperature gas can be discharged smoothly and reliably.

[0020] In some embodiments, there is a gap between the explosion-proof valve and the side support plate.

[0021] When thermal runaway occurs in the battery cell, the gap can provide a valve opening distance for the explosion-proof valve, so that the explosion-proof valve can be opened smoothly, so that the high-temperature gas inside the battery cell can be discharged smoothly and reliably.

[0022] In some embodiments, the exhaust port opens toward the housing.

[0023] The opening direction of the exhaust port is toward the box body, so that the high-temperature gas discharged from the exhaust port does not directly face the battery cell components, but flows toward the box body outside the battery cell, thereby reducing the risk of heat diffusion of the high-temperature gas into the battery cell.

[0024] In some embodiments, the exhaust port is formed at at least one end of the side support plate along the third direction, and a groove connected to the exhaust port is provided at the end of the side support plate where the exhaust port is formed, and the groove penetrates the side support plate along the second direction; the battery device also includes a cover plate, which is provided on one side of the battery cell row along the third direction and avoids at least a portion of the groove.

[0025] The cover plate forms a protection for the battery cell row, and the high-temperature gas discharged from the exhaust port flows through the groove to the area between the cover plate and the box body, and will not enter the battery cell row inside the cover plate. Thus, the risk of heat diffusion of the high-temperature gas into the battery cell row is further reduced.

[0026] In some embodiments, each of the battery cells includes explosion-proof valves respectively located at both ends along the second direction. A plurality of the battery cell assemblies are provided, and the plurality of battery cell assemblies are arranged along the second direction. Among the plurality of battery cell assemblies, a protection plate is provided between the side support plates of two adjacent battery cell assemblies, and exhaust channels are formed between the opposite two sides of the protection plate along the second direction and the adjacent two side support plates respectively.

[0027] Sharing one protection plate between the side support plates of two adjacent battery cell assemblies can reduce space occupation, improve the volume utilization rate of the box body, and also contribute to the lightweight of the entire battery device.

[0028] In some embodiments, each of the battery cells includes electrode terminals respectively located at both ends along the second direction. The electrode terminals pass through the side support plates and part of them are located in the exhaust channels. The electrode terminals between each of the battery cells are connected by a connecting member, and the connecting member is located between the side support plate and the protection plate.

[0029] The connecting member is located between the side support plate and the protection plate, which facilitates the connection between the connecting member and the electrode terminals of each battery cell.

[0030] In some embodiments, the connecting member is provided with a heating component.

[0031] The heating component can heat the connecting member, thereby heating each battery cell. Setting the heating component on the connecting member can reduce space occupation and improve the volume energy density of the battery device. In the past, heating each battery cell by setting a heating film between each battery cell required additional space in the box body, resulting in a reduction in the number of battery cells arranged, and thus the volume energy density of the battery device is low.

[0032] In some embodiments, the battery cell assembly further includes a pair of end plates, and the pair of end plates are respectively located on both sides of the battery cell row along the first direction and are respectively connected to the pair of side support plates.

[0033] By respectively connecting the pair of end plates to the pair of side support plates, the side support plates support the battery cell row more stably.

[0034] The second aspect of the embodiments of the present application provides an electrical device, including: the battery device according to any one of the above embodiments.

[0035] By setting the battery device according to the embodiments of the present application, when a battery cell undergoes thermal runaway, the protection plate can block the impact during gas eruption, and the gas can erupt directionally through the exhaust channel, reducing the risk of gas thermal diffusion, thereby reducing the damage degree of the battery device.

[0036] The beneficial effects of the embodiments of the present application include: being able to reduce the damage degree of the battery device during thermal runaway and also being able to improve the volume utilization rate. Description of the Drawings

[0037] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0038] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0039] Figure 2 Simplified structural schematic diagram of a battery device provided by some embodiments of the present application;

[0040] Figure 3 Partial cross-sectional schematic diagram of a battery device provided by some embodiments of the present application;

[0041] Figure 4 Structural schematic diagram of the side support plate and the protection plate of a battery device provided by some embodiments of the present application;

[0042] Figure 5 Partial structural schematic diagram of the side support plate of a battery device provided by some embodiments of the present application;

[0043] Figure 6 Partial structural schematic diagram of a battery device provided by some embodiments of the present application;

[0044] Figure 7 Exploded structural schematic diagram of two adjacent side support plates of a battery device provided by some embodiments of the present application and the protection plate located between the two side support plates.

[0045] Description of the Reference Numerals

[0046] 1000 - Vehicle; 100 - Battery device; 200 - Controller; 300 - Motor;

[0047] 10 - Box; 11 - First box; 12 - Second box; 20 - Battery cell assembly; 21 - Battery cell row; 211 - Battery cell; 211a - Explosion - proof valve; 211b - Electrode terminal; 22 - Side support plate; 22a - Exhaust passage; 22b - Exhaust port; 22c - Rib; 23 - Cover plate; 26 - Connecting piece; 27 - Cover plate; 28 - Heating component; 30 - Protective plate; 221 - Inner side; 222 - Outer side; 222a - Weak part; 222b - Vent hole; 222b - 1 - Sub - vent hole; 222c - Electrode terminal through - hole; 222e - Shielding part; 223 - Mounting hole; 225 - Top surface; 225a - Groove; 30 - Protective plate. Detailed implementation mode

[0048] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification and the above - mentioned accompanying drawings are intended to cover non - exclusive inclusion.

[0050] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary - secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two unless otherwise specifically defined.

[0051] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0053] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They 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 referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0056] Below, this application is described in detail.

[0057] At present, new energy battery devices are increasingly used in life and industry. New energy battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0058] Battery devices usually contain battery cells. The explosion-proof valves of battery cells can achieve internal and external air pressure balance under normal working conditions, thereby reducing the risk of thermal runaway. In addition, once a battery cell experiences thermal runaway, the explosion-proof valve can also open quickly and spray a large amount of gas to the outside. Since the gas has a certain impact force and contains a large amount of heat when it erupts, and the gas may also be mixed with other chemical substances, it may cause damage or destruction to surrounding components. Therefore, how to reduce the degree of damage to the battery device when a battery cell experiences thermal runaway is a topic that needs to be studied at present. In addition, the industry has also put forward higher requirements for the volume utilization rate of battery devices.

[0059] A protective plate is provided on one side of the side support plate that supports the battery cell, and an exhaust passage for exhausting gas is formed between the protective plate and the side support plate. The protective plate can block the impact when the gas erupts, and the gas is ejected directionally through the exhaust passage. Such a design can reduce the risk of the gas impacting the surrounding components and the heat spreading to the surrounding components, thereby reducing the damage degree of the battery device. Moreover, there is no need to arrange an additional exhaust passage inside the box body, so the space occupation can also be reduced, thereby improving the volume utilization rate of the battery device.

[0060] Based on the above concept, an embodiment of the present application provides a battery device, including: a box body; at least one battery cell assembly disposed in the box body, the battery cell assembly including a battery cell row and a pair of side support plates, the battery cell row including a plurality of battery cells arranged along a first direction, each battery cell including an explosion-proof valve at at least one end along a second direction, and the pair of side support plates respectively supporting both sides of the battery cell row along the second direction, the second direction being perpendicular to the first direction. Among the pair of side support plates, the side support plate on the same side as the explosion-proof valve is provided with a ventilation hole and an exhaust port communicated with the ventilation hole; a protective plate disposed on the outer side surface of the side support plate, and an exhaust passage is formed between the protective plate and the side support plate, and the exhaust passage is respectively communicated with the ventilation hole and the exhaust port.

[0061] By forming an exhaust passage body between the protective plate and the side support plate, when a thermal runaway occurs in the battery cell, the protective plate can block the impact when the high-temperature gas erupts, and the high-temperature gas can be ejected directionally through the exhaust passage, reducing the risk of the high-temperature gas thermal diffusion, thereby reducing the damage degree of the battery device; in addition, since the exhaust passage is formed by the mutual cooperation of the side support plate and the protective plate, there is no need to arrange an additional exhaust passage in the box body, so the space occupation can be reduced, thereby improving the volume utilization rate of the battery device.

[0062] The technical solutions described in the embodiments of the present application are applicable to various electrical devices, for example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0063] The battery device (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component (connector).

[0064] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing multiple battery cells into an independent module. As an example, the battery module can be formed by fixing multiple battery cells through side support plates and end plates.

[0065] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0066] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0067] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0068] As an example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0069] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0070] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and a door is provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0071] In the embodiments of the present application, the battery cell can be a secondary battery, and a secondary battery refers to a battery cell that can activate the active material and continue to be used by charging after discharging.

[0072] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0073] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent short circuit between the positive and negative electrodes and allow active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0076] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, titanium, etc. can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0077] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the embodiments of the present application are not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0078] In some embodiments, the positive electrode can be a foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material can also be provided. As an example, a lithium source material, potassium metal, or sodium metal can also be filled or / and deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0079] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0080] As an example, the negative electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector can be formed by forming a metal material (such as copper, copper 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.). In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0081] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0082] In some embodiments, the separator is a separator membrane. There is no particular limitation on the type of the separator membrane in the embodiments of the present application, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0083] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0084] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously plays the role of transporting ions and isolating the positive and negative electrodes.

[0085] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte plays a role of conducting ions between the positive and negative electrodes. There is no specific limitation on the type of the electrolyte in the embodiments of the present application, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0086] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0087] In some embodiments, the electrode assembly is a stacked structure.

[0088] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be respectively provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0089] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0090] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folding segments.

[0091] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0092] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0093] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0094] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0095] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0096] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0097] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0098] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal may be directly connected to the tab, or indirectly connected to the tab via a transition component. The electrode terminal may be disposed on the end cap, or on the housing.

[0099] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to release the internal pressure of the battery cell.

[0100] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present application is taken as a vehicle 1000 as an example.

[0101] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1As shown, a battery device 100 is provided inside the vehicle 1000. The battery device 100 can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start-up, navigation and driving of the vehicle 1000.

[0102] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0103] Next, with reference to Figures 2 to 7 Some embodiments of the present application will be described in detail.

[0104] In the embodiments of the present application, the direction where the arrow X is located in the figure represents the first direction X, the direction where the arrow Y is located represents the second direction Y, and the direction where the arrow Z is located represents the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs. As an example, the battery device 100 is installed on the chassis of the vehicle 1000. The first direction X can be the length direction of the vehicle, the second direction Y can be the width direction of the vehicle, and the third direction Z can be the height direction of the vehicle. Of course, the battery device 100 can also be installed at other positions of the vehicle 1000, and the placement orientation of the battery device 100 can also be adjusted accordingly as needed.

[0105] The embodiments of the present application provide a battery device 100, including: a box body 10; at least one battery cell assembly 20, arranged inside the box body 10. The battery cell assembly 20 includes a battery cell row 21 and a pair of side support plates 22 respectively supported on both sides of the battery cell row 21 along the second direction Y. The battery cell row 21 includes a plurality of battery cells 211 arranged along the first direction X. Each battery cell 211 includes an explosion-proof valve 211a located at at least one end along the second direction Y. The second direction Y is perpendicular to the first direction X. Among the pair of side support plates 22, the side support plate 22 on the same side as the explosion-proof valve 211a is provided with a ventilation hole 222b and an exhaust port 22b communicated with the ventilation hole 222b; a protection plate 30, arranged on the outer side surface 222 of the side support plate 22 on the same side as the explosion-proof valve 211a and away from the battery cell 211. An exhaust channel 22a is formed between the protection plate 30 and the side support plate 22. The exhaust channel 22a is respectively communicated with the ventilation hole 222b and the exhaust port 22b.

[0106] The box body 10 is used to accommodate at least one battery cell assembly 20. As an example, with reference to Figure 2, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 may be snap-connected along the third direction Z, so that a closed space is formed inside the housing 10 to accommodate the battery cell assembly 20. Here, "closed" means covering or closing, which may be sealed or non-sealed. Exemplarily, the first housing 11 may be a bottom case, and the second housing 12 may be a top cover.

[0107] The battery cell assembly 20 includes a battery cell row 21 and a pair of side support plates 22 respectively supported on both sides of the battery cell row 21 along the second direction Y. The battery cell row 21 includes a plurality of battery cells 211 arranged along the first direction X. It can be understood that each battery cell 211 is located between a pair of side support plates 22, and both ends of each battery cell 211 along the second direction Y are respectively supported by the side support plates 22.

[0108] Multiple rows of battery cell rows 21 may be provided, and the multiple rows of battery cell rows 21 are arranged along the third direction Z. As an example, along the second direction Y, the surfaces of a pair of side support plates 22 facing each other are inner surfaces 221 ( Figure 7 as shown), and the surfaces opposite to the inner surfaces 221 are outer surfaces 222 ( Figure 7 as shown). A plurality of rows of mounting holes are formed on the inner surface 221 of each side support plate 22, and the plurality of rows of mounting holes (for example, three rows) are arranged along the third direction Z. Each row of mounting holes includes a plurality of mounting holes 223 arranged along the first direction X. The mounting holes 223 in a pair of side support plates 22 correspond to each other one by one, and the two corresponding mounting holes 223 are used to respectively mount both ends of the battery cell 211 along the second direction Y. The shape of the mounting hole 223 may be adapted to the outer shape of the battery cell 211. Exemplarily, the mounting hole 223 may be a round hole, and the battery cell 211 may be a cylindrical battery cell. Of course, the mounting hole 223 and the battery cell 211 may also be square, prismatic or other shapes respectively.

[0109] Each battery cell 211 includes an explosion-proof valve 211a located at at least one end along the second direction Y ( Figure 6 as shown), which may be that each battery cell 211 only has an explosion-proof valve 211a at one end along the second direction Y, or each battery cell 211 has explosion-proof valves 211a at both ends along the second direction Y respectively.

[0110] Among a pair of side support plates 22, the side support plate 22 located on the same side as the explosion-proof valve 211a is provided with a ventilation hole 222b ( Figure 5 as shown) and an exhaust port 22b ( Figure 5 as shown) communicated with the ventilation hole 222b.

[0111] The side support plate 22 located on the same side of the explosion-proof valve 211a can be understood as the battery cell 211 is provided with a side support plate 22 on the side of the explosion-proof valve 211a. If the battery cell 211 has an explosion-proof valve 211a only at one end along the second direction Y, the side support plate 22 located on the same side of the explosion-proof valve 211a refers to a side support plate 22 on the one end side. If the battery cell 211 has explosion-proof valves 211a at both ends along the second direction Y respectively, the side support plate 22 located on the same side of the explosion-proof valve 211a refers to two side support plates 22 on the two end sides.

[0112] The protective plate 30 is disposed on the side support plate 22 located on the same side of the explosion-proof valve 211a and away from the outer side surface 222 of the battery cell 211, and an exhaust passage 22a ( Figure 3 As shown), the exhaust passage 22a is connected to the vent hole 222b and the exhaust port 22b respectively. Figure 3 The cross-sectional view shown is a partial cross-sectional view which is a cross-section perpendicular to the first direction and cut through the center position of the electrode terminal of the battery cell.

[0113] The material of the protection plate 30 can be high-strength steel or high-strength plastic.

[0114] When thermal runaway occurs in the battery cell 211 , the high-temperature gas ejected from the explosion-proof valve 211 a may enter the exhaust passage 22 a through the vent hole 222 b and be discharged in a directionally manner through the exhaust port 22 b .

[0115] As an example, the air jet port of the explosion-proof valve 211 a corresponds to the vent hole 222 b , and the air jet port faces the protection plate 30 .

[0116] An exhaust channel 22a is formed between the side support plate 22 and the protective plate 30. When the battery cell 211 has thermal runaway, the protective plate 30 can block the impact of the gas erupting from the explosion-proof valve 211a, and the gas is ejected in a direction through the exhaust port 22b, thereby reducing the risk of gas thermal diffusion, thereby reducing the degree of damage to the entire battery device 100. In addition, since the exhaust channel 22a is formed by the cooperation of the side support plate 22 and the protective plate 30, there is no need to arrange an additional exhaust channel in the box body 10, thereby reducing the space occupancy, thereby improving the volume utilization rate of the box body 10.

[0117] In some embodiments, the outer side surface 222 of the side support plate 22 located on the same side of the explosion-proof valve 211a is provided with a convex rib 22c ( Figure 5 As shown in the figure, the rib 22c extends from one side of the side support plate 22 in the third direction Z to the other side, the rib 22c is located between the side support plate 22 and the protective plate 30, the exhaust channel 22a is formed in the space surrounded by the rib 22c, the side support plate 22 and the protective plate 30, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0118] The rib 22c extends from one side to the other side of the side support plate 22 in the third direction Z. Wherein, the rib 22c can be a continuous single rib 22c or multiple non-connected ribs 22c.

[0119] The rib 22c can block the high-temperature gas ejected by the explosion-proof valve 211a from diffusing in directions other than the exhaust port 22b, so that the high-temperature gas can be ejected directionally, reducing the degree of damage to surrounding components.

[0120] In some embodiments, multiple ribs 22c are provided, and multiple exhaust channels 22a are formed between the side support plate 22 and the protection plate 30. Each exhaust channel 22a is separated by a rib 22c, and each exhaust channel 22a is respectively communicated with an exhaust port.

[0121] Each exhaust channel 22a can respectively correspond to an explosion-proof valve 211a and a ventilation hole 222b, or each exhaust channel 22a can correspond to multiple explosion-proof valves 211a and ventilation holes 222b.

[0122] The multiple exhaust channels 22a are separated by ribs 22c into independent channels. When one or more explosion-proof valves 211a corresponding to a certain exhaust channel 22a are opened, the gas ejected from the explosion-proof valve 211a will not flow to other channels, thereby reducing the risk of heat diffusion of the high-temperature gas, and thus being able to reduce the degree of damage of the high-temperature gas to the battery device.

[0123] In some embodiments, referring to Figure 5 , in the side support plate 22, multiple ventilation holes 222b are provided in the part located in an exhaust channel 22a, and the multiple ventilation holes 222b are arranged in one-to-one correspondence with the multiple explosion-proof valves 211a.

[0124] It can be understood that the multiple ventilation holes 222b are located in an exhaust channel 22a, and each ventilation hole 222b corresponds to an explosion-proof valve 211a.

[0125] Thus, multiple explosion-proof valves 211a can share an exhaust channel 22a, thereby being able to reduce the number of ribs 22c provided on the side support plate 22, contributing to the lightweight of the entire battery device 100 and also reducing costs.

[0126] In some embodiments, in the same projection plane perpendicular to the second direction Y, the projection of the explosion-proof valve 211a and the projection of the ventilation hole 222b at least partially overlap.

[0127] Referring to Figure 5 , along the second direction Y, the explosion-proof valve 211a can be directly opposite to the ventilation hole 222b or deviate by a certain angle, as long as the gas ejected from the explosion-proof valve 211a can smoothly pass through the ventilation hole 222b.

[0128] The number of vent holes 222b can be one or more. When there is one vent hole 222b, the explosion-proof valve 211a can be fully exposed to the vent hole 222b or partially exposed to the vent hole 222b.

[0129] Thus, the high-temperature gas ejected by the explosion-proof valve 211a can smoothly enter the exhaust passage 22a through the vent hole 222b and be discharged through the exhaust port 22b, reducing the risk of high-temperature gas entering the interior of the battery cell row 21.

[0130] In some embodiments, an electrode terminal through-hole 222c and a vent hole 222b are provided at a position of the side support plate 22 corresponding to one battery cell 211. A portion of the side support plate 22 located between the electrode terminal through-hole 222c and the vent hole 222b forms a shielding portion 222e, and the shielding portion 222e breaks relative to other portions of the side support plate 22 in the case of thermal runaway of the battery cell 211.

[0131] One battery cell 211 corresponds to one electrode terminal through-hole 222c and one vent hole 222b. The electrode terminal through-hole 222c and the vent hole 222b can be arranged adjacent to each other, and the portion therebetween shields the explosion-proof valve of one battery cell 211.

[0132] Exemplarily, along the second direction Y, the shielding portion 222e can be directly opposite to the explosion-proof valve 211a. Of course, the shielding portion 222e can also deviate from the explosion-proof valve 211a by a certain distance.

[0133] The shielding portion 222e can protect the explosion-proof valve 211a. Under normal operating conditions of the battery cell 211, the explosion-proof valve 211a can exhaust through the vent hole 222b. When thermal runaway occurs in the battery cell 211, the high-temperature gas ejected by the explosion-proof valve 211a can damage the shielding portion 222e, so that a large amount of high-temperature gas can be ejected smoothly.

[0134] In some embodiments, the vent hole 222b includes a plurality of sub-vent holes 222b-1 arranged at intervals. The shielding portion 222e is connected to other portions of the side support plate 22 through a weak portion 222a. The weak portion 222a is located between each sub-vent hole 222b-1 and between the sub-vent hole 222b-1 close to the electrode terminal through-hole 222c and the electrode terminal through-hole 222c.

[0135] The electrode terminal through-hole 222c is adjacent to a plurality of sub-vent holes 222b-1 arranged at intervals. For example, the electrode terminal through-hole 222c is located on one side of the sub-vent hole 222b-1 along the third direction Z.

[0136] The side support plate 22 has a weak portion 222a, which is easier to break than other positions of the side support plate 22. Therefore, when thermal runaway occurs in the battery cell 211 and the high-temperature gas impacts the shielding portion 222e, the shielding portion 222e can be more easily broken at the weak portion 222a, thereby allowing the high-temperature gas to be ejected smoothly and reliably.

[0137] In some embodiments, a gap A is provided between the explosion-proof valve 211 a and the side support plate 22 .

[0138] The distance of the gap A can be adjusted according to the size of the explosion-proof valve 211a when it is opened, so as to prevent the explosion-proof valve from opening.

[0139] When thermal runaway occurs in the battery cell 211 , the gap can provide a distance for the explosion-proof valve to open, so that the explosion-proof valve 211 a can be opened smoothly, thereby allowing the high-temperature gas to be ejected smoothly.

[0140] In some embodiments, the opening of the exhaust port 22 b faces the inner wall of the housing 10 .

[0141] For example, the exhaust port 22b may be located on one side of the explosion-proof valve 211a along the third direction Z. Specifically, the exhaust port 22b is located on one side of the explosion-proof valve 211a of the battery cell 211 of the first box body 11 (such as the upper cover) closest to the box body 10.

[0142] The opening of the exhaust port 22b faces the inner wall of the box body 10, so that the high-temperature gas discharged from the exhaust passage does not directly face the battery cell row, but flows toward the box body 10 outside the battery cell row, thereby reducing the risk of high-temperature gas diffusing into the battery cell row.

[0143] In some embodiments, the exhaust port 22b is formed at at least one end of the side support plate 22 along the third direction Z, and a groove 225a connected to the exhaust port 22b is provided at the end of the side support plate 22 where the exhaust port 22b is formed, and the groove 225a penetrates the side support plate 22 along the second direction Y; the battery device 100 also includes a cover plate 23, which is covered on one side of the battery cell row 21 along the third direction Z and avoids at least a portion of the groove 225a.

[0144] The groove 225 a penetrates the side support plate 22 along the second direction Y. It can be understood that along the second direction Y, two ends of the groove 225 a extend and pass through two sides of the top surface 225 respectively.

[0145] The high-temperature gas exhausted from the exhaust port 22b flows to the outside of the cover plate 23 through the groove 225a and will not diffuse heat to the inside of the cover plate 23, thereby protecting the battery cell row 21 inside the cover plate 23, thereby further reducing the risk of high-temperature gas thermally diffusing into the inside of the battery cell row 21.

[0146] In some embodiments, a plurality of battery cell assemblies 20 are provided. The plurality of battery cell assemblies 20 are arranged along the second direction Y. Between adjacent two battery cell assemblies 20 among the plurality of battery cell assemblies 20, a protection plate 30 is provided, and exhaust channels 22a are formed between the protection plate 30 and adjacent two side support plates 22 respectively on two opposite sides along the second direction Y.

[0147] There may be two, three or more battery cell assemblies 20 arranged along the second direction Y. A single protection plate 30 is shared between the side support plates 22 of adjacent two battery cell assemblies 20, so that exhaust channels 22a are formed between the two sides of a single protection plate 30 and adjacent two side support plates 22 respectively.

[0148] Sharing a single protection plate 30 between the side support plates 22 of adjacent two battery cell assemblies 20 can reduce space occupation, improve volume utilization rate, and is also beneficial to the overall weight reduction of the battery device 100.

[0149] In some embodiments, each battery cell 211 includes electrode terminals 211b located at both ends along the second direction Y respectively. The electrode terminals 211b pass through the side support plate 22 and are located in the exhaust channel 22a. The electrode terminals 211b between each battery cell 211 are connected by a connecting member 26, and the connecting member 26 is located between the side support plate 22 and the protection plate 30.

[0150] The connecting member 26 being located between the side support plate 22 and the protection plate 30 facilitates the connection of the connecting member 26 to the electrode terminals of each battery cell 211.

[0151] In some embodiments, the connecting member 26 is provided with a heating component 28.

[0152] The heating component 28 can heat the connecting member 26 by being powered on to generate heat, thereby heating the battery cell 211. In addition, the heating component 28 can also be other heat conduction components, such as a liquid heating pipe, etc.

[0153] Exemplarily, the connecting member 26 may be provided with a mounting groove recessed towards the side support plate 22. The heating component 28 may be a metal wire, and the metal wire is installed in the mounting groove and located between the connecting member 26 and the protection plate 30, so that the protection plate 30 can insulate the heating component 28 and reduce heat loss.

[0154] The heating component 28 can heat the connecting member 26, thereby heating each battery cell 211. By arranging the heating component 28 on the connecting member 26, the space occupation can be reduced, and the volumetric energy density of the battery device 100 can be improved. In the past, each battery cell 211 was heated by arranging a heating film between each battery cell 211, which required additional space in the box body 10, resulting in a small number of battery cells 211 arranged, so it was not conducive to the improvement of the volumetric energy density of the battery device.

[0155] In some embodiments, the battery cell assembly 20 further includes a pair of end plates (not shown in the figure), and the pair of end plates are respectively located on both sides of the battery cell row 21 along the first direction X and are respectively connected to a pair of side support plates 22.

[0156] The pair of end plates and the pair of side support plates 22 surround the periphery of the battery cell row 21. By connecting the pair of end plates to the pair of side support plates 22 respectively, the side support plates 22 support the battery cell row 21 more firmly.

[0157] Next, with reference to Figures 2 to 6 , a specific example of the present application will be described.

[0158] The battery device 100 provided by the embodiment of the present application includes: a box body 10, a plurality of battery cell assemblies 20 arranged along the second direction Y, and a protection plate 30.

[0159] Each battery cell assembly 20 is accommodated in the box body 10. Each battery cell assembly 20 includes a plurality of battery cell rows 21 arranged along the third direction Z, and each battery cell row 21 includes a plurality of battery cells 211 arranged along the first direction X. Explosion-proof valves 211a and electrode terminals 211b are respectively arranged at both ends of each battery cell 211 along the second direction Y.

[0160] Each battery cell assembly 20 further includes a pair of side support plates 22 and a cover plate 23. Each battery cell 211 in each battery cell row 21 is respectively supported by the pair of side support plates 22 at both ends along the second direction Y, and the cover plate 23 is covered above the battery cell row 21 and is connected to the pair of side support plates 22.

[0161] A protection plate 30 is arranged between the side support plates 22 of two adjacent battery cell assemblies 20, and protection plates 30 are also respectively arranged on the outer side surfaces 222 of the side support plates 22 of the first battery cell assembly 20 and the last battery cell assembly along the second direction Y.

[0162] Along the second direction Y, each side support plate 22 has an inner side surface 221 close to the battery cell 211 and an outer side surface 222 away from the battery cell 211, and the outer side surface 222 of each side support plate 22 is provided with ventilation holes 222b and multiple exhaust ports 22b corresponding to each explosion-proof valve 211a one by one, and the outer side surface 222 of each side support plate 22 is provided with multiple ribs 22c, and each rib 22c, the side support plate 22 and the protective plate 30 enclose a plurality of spaces, thereby forming a plurality of exhaust channels 22a, and each exhaust channel 22a corresponds to the explosion-proof valves 211a of multiple battery cells 211 and is respectively connected to an exhaust port 22b.

[0163] A groove 225 a communicating with the exhaust port 22 b is provided at the top along the third direction Z. The groove 225 a penetrates the side support plate 22 along the second direction Y, and the cover plate 23 avoids the groove 225 a.

[0164] When thermal runaway occurs in the battery cell 211, the explosion-proof valve 211a of the battery cell 211 ejects high-temperature gas, which enters the exhaust channel through the vent hole 222b along the second direction Y and is discharged in a direction through the exhaust port 22b opening in the third direction Z. The gas discharged from the exhaust port 22b is guided to flow out of the cover plate 23 (for example, between the cover plate 23 and the box body 10) through the groove 225a extending along the second direction Y. Since the cover plate 23 covers the battery cell row 21, the gas guided out from the groove 225a will not directly enter the battery cell row 21, thereby reducing the risk of damage to the battery cell row 21.

[0165] The embodiment of the present application further provides an electrical device, including the battery device 100 mentioned above.

[0166] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the present application.

Claims

1. A battery device, characterized in that, Comprising: A box body; At least one battery cell assembly, arranged in the box body, the battery cell assembly includes a battery cell row and a pair of side support plates, the battery cell row includes a plurality of battery cells arranged along a first direction, each battery cell includes an explosion-proof valve at at least one end in a second direction, a pair of side support plates are respectively supported on both sides of the battery cell row along the second direction, the second direction is perpendicular to the first direction, among the pair of side support plates, the side support plate located on the same side of the explosion-proof valve is provided with a ventilation hole and an exhaust port communicated with the ventilation hole; A protection plate, arranged on the outer side surface of the side support plate away from the battery cell, an exhaust passage is formed between the protection plate and the side support plate, and the exhaust passage is respectively communicated with the ventilation hole and the exhaust port.

2. The battery device according to claim 1, wherein A rib is arranged on the outer side surface of the side support plate located on the same side of the explosion-proof valve, the rib extends from one side of the side support plate in a third direction to the other side, the rib is located between the side support plate and the protection plate, and the exhaust passage is formed in the space surrounded by the rib, the side support plate and the protection plate, the third direction is perpendicular to the first direction and the second direction.

3. The battery device according to claim 2, wherein A plurality of the ribs are provided, and a plurality of the exhaust passages are formed between the side support plate and the protection plate, and each exhaust passage is separated by the rib, Each exhaust passage is respectively communicated with one exhaust port.

4. The battery device according to claim 3, wherein A plurality of the ventilation holes are arranged on the part of the side support plate located in one exhaust passage, and the plurality of ventilation holes are arranged in one-to-one correspondence with the plurality of explosion-proof valves.

5. The battery device according to any one of claims 1 to 4, wherein In the same projection plane perpendicular to the second direction, the projection of the explosion-proof valve and the projection of the ventilation hole at least partially overlap.

6. The battery device according to claim 5, wherein An electrode terminal through hole and the ventilation hole are arranged at a position of the side support plate corresponding to one battery cell, a shielding part is formed on the part of the side support plate located between the electrode terminal through hole and the ventilation hole, and the shielding part breaks relative to other parts of the side support plate in the state of thermal runaway of the battery cell.

7. The battery device according to claim 6, wherein The ventilation hole includes a plurality of sub-ventilation holes arranged at intervals, the shielding part is connected to other parts of the side support plate through a weak part, The weak part is located between each sub-ventilation hole and between the sub-ventilation hole close to the electrode terminal through hole and the electrode terminal through hole.

8. The battery device according to any one of claims 1 to 7, wherein There is a gap between the explosion-proof valve and the side support plate.

9. The battery device according to any one of claims 1 to 8, wherein The opening direction of the exhaust port faces the box body.

10. The battery device according to any one of claims 1 to 9, characterized in that: The exhaust port is formed at at least one end of the side support plate along the third direction, A groove communicating with the exhaust port is provided at the end of the side support plate where the exhaust port is formed, and the groove penetrates the side support plate along the second direction; The battery device further includes a cover plate, which is disposed on one side of the battery cell row along the third direction and avoids the groove.

11. The battery device according to any one of claims 1 to 10, characterized in that: Each of the battery cells includes the explosion-proof valves located at two ends along the second direction, The battery cell assemblies are provided in plurality, and the plurality of battery cell assemblies are arranged along the second direction, In the plurality of battery cell assemblies, the protection plate is disposed between the side support plates of two adjacent battery cell assemblies, and the exhaust passage is formed between the two opposite surfaces of the protection plate along the second direction and the two adjacent side support plates.

12. The battery device according to any one of claims 6 to 11, characterized in that: Each of the battery cells includes electrode terminals respectively located at both ends along the second direction, the electrode terminals pass through the electrode terminal through holes and are partially located in the exhaust channel, the electrode terminals between the battery cells are connected by a connector, and the connector is located between the side support plate and the protective plate.

13. The battery device according to claim 12, characterized in that: The connecting piece is provided with a heating component.

14. The battery device according to any one of claims 1 to 13, characterized in that: The battery cell assembly further includes a pair of end plates, which are respectively located at two sides of the battery cell row along the first direction and are respectively connected to the pair of side support plates.

15. The battery device according to any one of claims 1 to 14, characterized in that: The battery cells include cylindrical battery cells.

16. An electrical device, characterized in that, include: A battery device as claimed in any one of claims 1 to 15.

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