Battery device, vehicle, energy storage device and energy storage system

Abstract

The utility model discloses a battery device, a vehicle, an energy storage device and an energy storage system, and belongs to the field of batteries. The battery device comprises a box body and a plurality of batteries, and the box body forms an accommodating cavity; the plurality of batteries are accommodated in the accommodating cavity, the plurality of batteries are stacked along a first direction, and an acute angle is formed between a stacking surface between the plurality of batteries and the first direction. Through the design that the stacking faces of the batteries and the first direction form the acute angles, the expansion force of the batteries can be dispersed to the frame, the upper shell and the lower shell of the box body, the structural strength of the frame, the upper shell and the lower shell of the box body is fully utilized, the upper limit of the constraint pressure index of the batteries is improved under the condition that the strength of the box body does not need to be increased, and the service life of the batteries is prolonged. Therefore, the low-power discharge performance of the battery is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery device, a vehicle, an energy storage device and an energy storage system. BACKGROUND

[0002] The battery device comprises a box body and a plurality of batteries accommodated in the box body. The batteries will swell during operation. When the batteries swell, the box body will constrain the swelling of the batteries, so that the box body needs to have a high strength requirement. CONTENT OF THE UTILITY MODEL

[0003] The application aims to at least solve one of the technical problems in the prior art. To this end, the application provides a battery device, a vehicle, an energy storage device and an energy storage system, which can improve the upper limit of the constraint pressure index of the battery without increasing the strength of the box body, thereby improving the low-power discharge performance of the battery.

[0004] In a first aspect, the application provides a battery device, comprising:

[0005] a box body forming an accommodation cavity;

[0006] a plurality of batteries accommodated in the accommodation cavity, the plurality of batteries being stacked along a first direction, and the stacking surfaces of the plurality of batteries being at an acute angle with the first direction.

[0007] According to the battery device of the application, the stacking surfaces of the plurality of batteries are designed to be at an acute angle with the first direction, so that the battery swelling force can be dispersed to the frame, the upper shell and the lower shell of the box body, the structural strength of the frame, the upper shell and the lower shell of the box body is fully utilized, the upper limit of the constraint pressure index of the battery is improved without increasing the strength of the box body, and the low-power discharge performance of the battery is improved.

[0008] According to an embodiment of the application, a protection cavity is formed between the batteries at both ends along the first direction and the box body, the length of the protection cavity along the first direction is monotonous along the second direction, and the protection cavity is provided with an anti-swelling structure.

[0009] According to an embodiment of the application, the anti-swelling structure is an elastic member, or the anti-swelling structure has a cavity.

[0010] According to an embodiment of the application, the cross section of the battery is rectangular, and the side surface of the plurality of batteries along the second direction after being stacked along the first direction is sawtooth-shaped.

[0011] According to an embodiment of the application, a limiting member is arranged at the side surface of the plurality of batteries along the second direction after being stacked along the first direction, the side surface of the limiting member away from the battery is planar, and the side surface of the limiting member toward the battery is sawtooth-shaped.

[0012] According to one embodiment of the present application, the limiting piece is filled glue.

[0013] According to one embodiment of the present application, the cross section of the battery is a parallelogram, and the plurality of batteries are aligned along the side surface in the second direction after being stacked in the first direction.

[0014] In a second aspect, the present application provides a vehicle, comprising: a plurality of battery devices according to any one of the above embodiments.

[0015] According to the vehicle of the present application, the battery device of any one of the above embodiments is provided, and the design that the stacking surface between the plurality of batteries and the first direction is an acute angle can disperse the battery expansion force to the frame, the upper shell and the lower shell of the box body, fully utilize the structural strength of the frame, the upper shell and the lower shell of the box body, and increase the upper limit of the constraint pressure of the solid-state battery.

[0016] In a third aspect, the present application provides an energy storage device, comprising: a plurality of battery devices according to any one of the above embodiments, wherein the battery device is used to store or provide electric energy.

[0017] According to the energy storage device of the present application, the battery device of any one of the above embodiments is provided, and the design that the stacking surface between the plurality of batteries and the first direction is an acute angle can disperse the battery expansion force to the frame, the upper shell and the lower shell of the box body, fully utilize the structural strength of the frame, the upper shell and the lower shell of the box body, and increase the upper limit of the constraint pressure of the solid-state battery.

[0018] In a fourth aspect, the present application provides an energy storage system, comprising: a power conversion device and a plurality of energy storage devices according to any one of the above embodiments, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0019] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0021] Figure 1 is one of the structural schematic diagrams of the battery device provided by the embodiments of the present application;

[0022] Figure 2 is the second structural schematic diagram of the battery device provided by the embodiments of the present application;

[0023] Figure 3 is the third structural schematic diagram of the battery device provided by the embodiments of the present application;

[0024] Figure 4 FIG. 4 is a structural schematic diagram of a battery apparatus provided by an embodiment of the present application.

[0025] Reference signs:

[0026] box 1, accommodating cavity 11, protection cavity 111, frame 12, upper shell 13, lower shell 14;

[0027] battery 2, stacking surface 21

[0028] anti-expansion structure 3, limiting piece 4 DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0030] The following describes Figures 1-4 a battery apparatus, a vehicle, an energy storage apparatus, and an energy storage system according to an embodiment of the present application.

[0031] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application can include one or more battery packs for providing voltage and capacity. The battery pack can include a plurality of batteries 2 connected in series, in parallel, or in a mixed connection through a busbar component.

[0032] 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, and 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, and a spacecraft, etc.

[0033] The battery can be a secondary battery, which refers to a battery that can be activated by charging the active material after discharging the battery to continue using.

[0034] The battery 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 hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0035] The battery can be in the shape of a cylinder, a flat body, a cuboid or other shapes, and the embodiments of the present application are not limited thereto. The battery is generally divided into three types according to the packaging method: cylindrical battery, square battery and soft package battery, and the embodiments of the present application are not limited thereto.

[0036] The battery includes a shell, an electrode assembly and an electrolyte, and the shell is used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer, the positive current collector includes a positive current collector body and a positive tab, and the positive active material layer is coated on the surface of the positive current collector body. The positive tab is not coated with the positive active material layer and protrudes from the positive current collector body. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative current collector includes a negative current collector body and a negative tab, and the negative active material layer is coated on the surface of the negative current collector body. The negative tab is not coated with the negative active material layer and protrudes from the negative current collector body. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure that the fuse does not occur when passing a large current, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together.

[0037] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a laminated type structure, and the embodiments of the present application are not limited thereto.

[0038] The technical solutions described in the embodiments of the present application are applicable to various battery 2 using electric devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc. The battery 2 is used to store or provide electric energy.

[0039] Reference Figures 1-4 The battery device of the embodiments of the present application includes a box body 1 and a plurality of batteries 2, the box body 1 forms an accommodation cavity, and the plurality of batteries 2 are accommodated in the accommodation cavity.

[0040] As an example, the box body 1 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 1 to accommodate the battery 2. Here, closed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0041] As an example, the box 1 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that a closed space is formed inside the box 1 to accommodate the battery assembly.

[0042] In some embodiments, the box 1 can be part of the chassis structure of the vehicle. For example, part of the box 1 can be at least part of the floor of the vehicle, or part of the box 1 can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0043] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes airplanes, rockets, space shuttles and spaceships, etc. The battery device is used to store or provide electric energy.

[0044] Reference Figure 2 and Figure 4 The plurality of batteries 2 are stacked along the first direction.

[0045] In the embodiment, the plurality of batteries 2 are stacked and arranged obliquely in the accommodation cavity. The first direction can be the extension direction of the accommodation cavity. For example, the first direction can be the length direction of the accommodation cavity.

[0046] The oblique direction and the oblique angle of each battery 2 in the plurality of batteries 2 are consistent, so as to improve the space utilization of the accommodation cavity and improve the energy density of the battery device.

[0047] For example, the adjacent batteries 2 can be in direct contact, but are not limited to direct contact, and the adjacent batteries 2 can also have a gap.

[0048] In some embodiments, the gap between the adjacent batteries 2 can be filled with a buffer layer. For example, the buffer layer can be an aerogel, or an elastic material layer such as a rubber pad or a plastic pad, so as to protect the battery 2 during the expansion of the battery 2.

[0049] Reference Figure 2 and Figure 4 In the embodiment, the stacking surface 21 between the plurality of batteries 2 is at an acute angle with the first direction.

[0050] The side surface close to the adjacent battery 2 in the middle of the plurality of batteries 2 is the stacking surface 21, and the side surface of the battery 2 at both ends of the plurality of batteries 2 away from the battery 2 in the middle of the plurality of batteries 2 is the stacking surface 21.

[0051] In the embodiment, the box 1 includes a frame 11, and an upper shell 12 and a lower shell 13 distributed up and down along a second direction. The second direction is perpendicular to the first direction. The second direction can be the width direction of the box.

[0052] The two side faces of the battery 2 distributed along the second direction perpendicular to the first direction are close to the upper shell 12 and the lower shell 13 of the box body 1.

[0053] The stacking face 21 of the battery 2 is at an acute angle with the first direction, and the stacking face 21 on one side of the battery 2 is at an acute angle γ with the lower shell 13 of the box body 1, where γ satisfies 0°<γ<90°, and γ can be 10°, 30°, 45°, 60° or other values.

[0054] For example, when the angle γ between the stacking face 21 of the battery 2 and the first direction is 45°, the frame 11 and the upper shell 12 and the lower shell 13 of the box body 1 bear 0.707F of the battery expansion force F, which is 30% lower than when the battery 2 is arranged vertically or horizontally, and the frame 11 and the upper shell 12 of the box body 1 bear the same force, so that the upper limit of the constraint pressure index of the battery device can be improved without increasing the strength of the box body 1, thereby improving the low-power discharge performance of the battery device.

[0055] For example, when the angle γ between the stacking face 21 of the battery 2 and the first direction is greater than 45°, the frame 11 of the box body 1 bears more battery expansion force F, and the upper shell 12 or the lower shell 13 of the box body 1 bears less force, so that the upper limit of the constraint pressure index of the solid-state battery 2 can be improved.

[0056] For example, when the angle γ between the stacking face 21 of the battery 2 and the first direction is less than 45°, the frame 11 of the box body 1 bears less battery expansion force F, and the upper shell 12 or the lower shell 13 of the box body 1 bears more battery expansion force F, so that the upper limit of the constraint pressure index of the solid-state battery 2 can be improved.

[0057] It can be understood that due to the angle γ between the stacking face 21 of the battery 2 and the first direction, the expansion of the battery 2 will not be constrained by only the frame 11 or the upper shell 12 and the lower shell 13 of the box body 1, but the frame 11 and the upper shell 12 and the lower shell 13 of the box body 1 will provide a constraint force to offset the expansion force of the battery 2. The expansion force of the battery 2 is offset by the constraint force provided by the side frame 11 and the upper shell 12 and the lower shell 13 of the box body 1, so that the structural strength requirement of the box body 1 in a single lateral or normal direction is reduced.

[0058] For the solid-state battery 2, the battery 2 has a higher requirement for the pressure on the surface of the battery 2, which is generally between 0.5-50 MPa. The greater the surface pressure, the better the discharge performance of the battery 2 at low power, and the greater the discharge capacity of the battery 2. By arranging the battery 2 in an inclined manner, the appropriate inclination angle of the battery 2 can be selected according to the strength of the upper shell 12 and the lower shell 13 of the box body 1 and the strength of the frame 11, so as to reasonably distribute the stress of the box body 1. Since the upper shell 12, the lower shell 13 and the frame 11 simultaneously provide a constraint force, which can be used to offset the expansion force of the battery 2, the upper limit of the constraint pressure index of the battery 2 can be increased without increasing the strength of the box body 1, thereby improving the low-power discharge performance of the battery 2.

[0059] In the embodiment, by modifying the inclination angle, the stress of the box body 1 can be reasonably distributed according to the strength of the upper shell 12 and the lower shell 13 of the box body 1 and the strength of the frame 11. Since the upper shell 12, the lower shell 13 and the frame 11 jointly constrain the expansion of the battery cell, the strength requirement of the box body 1 can be reduced, and the upper limit of the constraint pressure index of the battery 2 is increased.

[0060] In the related art, the battery 2 is arranged vertically or horizontally in the box body 1. When the battery 2 expands, the frame 11 of the box body 1 alone bears the expansion force of the battery 2, or the upper shell 12 and the lower shell 13 of the box body 1 bear the expansion force of the battery 2. Therefore, the frame 11, the upper shell 12 and the lower shell 13 of the box body 1 all have a higher strength requirement, and the upper limit of the constraint pressure index of the box body 1 is lower.

[0061] According to the battery device provided in the embodiments of the present application, by designing the stacking surface 21 of the plurality of batteries 2 to form an acute angle with the first direction, the expansion force of the battery 2 can be dispersed to the frame 11, the upper shell 12 and the lower shell 13 of the box body 1, and the structural strength of the frame 11, the upper shell 12 and the lower shell 13 of the box body 1 is fully utilized. In this way, the upper limit of the constraint pressure index of the battery 2 can be increased without increasing the strength of the box body 1, thereby improving the low-power discharge performance of the battery 2.

[0062] Reference Figure 2 and Figure 4 In some embodiments, a protection cavity is formed between the battery 2 at both ends of the first direction and the box body 1.

[0063] The battery 2 at both ends arranged along the first direction, i.e., the front end and the rear end of the battery pack along the first direction, are both provided with a protection cavity with the box body 1.

[0064] The protection cavity is provided with an anti-expansion structure 3.

[0065] In some embodiments, the anti-expansion structure 3 is an elastic member, for example, the anti-expansion structure 3 can be a rubber block, a spring or an elastic sheet.

[0066] In some embodiments, the anti-expansion structure 3 has a cavity. Exemplarily, the anti-expansion structure 3 can be a profile, a metal block or a non-metal block with a cavity.

[0067] The length of the protection cavity along the first direction at each location along the second direction is monotonous. In each protection cavity, the length can gradually increase (i.e., "increasing type") or gradually decrease (i.e., "decreasing type") from one end to the other end of the cavity along the second direction.

[0068] It can be understood that the plurality of batteries 2 form a battery pack, the plurality of batteries 2 are stacked and arranged obliquely along the first direction, the plurality of batteries 2 form a parallelogram-like structure, and the monotonicity of the protection cavity formed by the battery pack at the foremost end along the first direction and the protection cavity formed by the battery pack at the rearmost end along the first direction is opposite.

[0069] Exemplarily, the length of the protection cavity formed by the battery pack at the foremost end along the first direction and the box 1 monotonously increases along the first direction at each location along the second direction from bottom to top; and the length of the protection cavity formed by the battery pack at the rearmost end along the first direction and the box 1 monotonously decreases along the first direction at each location along the second direction from bottom to top.

[0070] The battery 2 at the end and the anti-expansion structure 3 can be directly in contact or have a gap, and the gap can be filled with a buffer layer, which can be aerogel, rubber, etc.

[0071] The anti-expansion structure 3 can be connected to the box 1. Exemplarily, the anti-expansion structure 3 and the box 1 can be connected by bonding, welding, bolt connection or direct placement, etc.

[0072] The anti-expansion structure 3 can be connected to the box 1 at the same time and at least one of the frame 11 and the upper shell 12 and the lower shell 13.

[0073] In the embodiment, by arranging the protection cavity conforming to the monotonicity and arranging the anti-expansion structure 3 in the protection cavity, on the one hand, the oblique installation of the plurality of batteries 2 can be facilitated, and on the other hand, even if the battery 2 expands, the protection cavity can maintain its shape and integrity, reducing the risk of damage or leakage of the battery 2 due to excessive pressure.

[0074] In some embodiments, referring to Figure 1 and Figure 2 The cross section of the battery 2 is rectangular, and the side surface of the plurality of batteries 2 along the second direction after being stacked along the first direction is sawtooth-shaped.

[0075] In the embodiment, the battery 2 is a square battery or a rectangular battery. The battery 2 has a rectangular profile in a plane perpendicular to the stacking direction (i.e., the first direction).

[0076] When the rectangular batteries 2 are stacked along the first direction, since the stacking face 21 of each battery 2 forms an acute angle with the first direction, the side faces of the stacked battery group in the second direction cannot be aligned, and the top and bottom edges of each battery 2 are staggered in the second direction, presenting a jagged profile.

[0077] In some embodiments, referring to Figure 1 and Figure 2 , the plurality of batteries 2 are provided with limiters 4 at the side faces in the second direction after being stacked along the first direction, the side face of the limiter 4 away from the battery 2 is designed as a flat surface, and the side face of the limiter 4 towards the battery 2 is designed as a jagged surface.

[0078] The side face of the limiter 4 away from the battery 2 is designed as a flat surface, and the limiter 4 provides a flat contact surface that can be closely fitted with the box 1, the cooling system or other external components.

[0079] The side face of the limiter 4 towards the battery 2 is designed as a jagged surface to fit the jagged side face of the battery group formed by the plurality of batteries 2, thereby increasing the contact area of the limiter 4 with the plurality of batteries 2 stacked along the first direction, and the limiter 4 provides effective fixation and support.

[0080] For example, the limiter 4 is filled with glue, such as structural glue; or the limiter 4 is made of elastic material, such as foam or rubber; or the two side faces of the box 1 in the second direction can be designed as limiters 4 with jagged surfaces; or the limiter 4 can be a mechanical part, such as an injection molded part or an integrally formed metal part.

[0081] In some embodiments, referring to Figure 3 and Figure 4 , the cross section of the battery 2 is a parallelogram, and the side faces of the plurality of batteries 2 in the second direction are aligned after being stacked along the first direction.

[0082] The cross section of each battery 2 is designed as a parallelogram, and the battery 2 has a parallelogram profile in the plane perpendicular to the stacking direction. The side face of the battery 2 in the second direction is naturally aligned, forming a flat and continuous side face.

[0083] In this embodiment, the flat and aligned side face can form a surface contact with the box 1, reducing stress concentration and improving the service life of the box 1; at the same time, it can improve the space utilization of the box 1, thereby improving the energy density of the battery device; and it can also make the surface pressure of the battery 2 more uniform.

[0084] In some embodiments, referring to Figure 1 and Figure 2The multiple batteries 2 are stacked along the first direction, and a buffer layer is arranged at the side surface of the multiple batteries 2 along the second direction, and the buffer layer is arranged between the battery 2 and the box body 1 to protect the battery 2 and the box body 1.

[0085] The battery device provided by the embodiment of the application can be used to connect the frame 11, the lower shell 13 and the anti-expansion structure 3 first, then apply a limiting member 4 such as a structural adhesive to the lower shell 13, control the thickness of the adhesive by using an adhesive strip, fix the battery 2 in the corresponding position in the box body 1 by using a corresponding tool, and then connect the upper shell 12.

[0086] The embodiment of the application further provides a vehicle comprising the battery device of any one of the above embodiments.

[0087] The vehicle provided by the embodiment of the application is provided with the battery device of any one of the above embodiments, and the battery device can disperse the expansion force of the battery 2 to the frame 11, the upper shell 12 and the lower shell 13 of the box body 1 by the design that the stacking surface 21 between the multiple batteries 2 and the first direction forms an acute angle, fully utilize the structural strength of the frame 11, the upper shell 12 and the lower shell 13 of the box body 1, and increase the upper limit of the constraint pressure of the solid-state battery 2.

[0088] The embodiment of the application further provides a storage device comprising the battery device of any one of the above embodiments, and the battery device is used to store or provide electric energy.

[0089] The storage device provided by the embodiment of the application is provided with the battery device of any one of the above embodiments, and the battery device can disperse the expansion force of the battery 2 to the frame 11, the upper shell 12 and the lower shell 13 of the box body 1 by the design that the stacking surface 21 between the multiple batteries 2 and the first direction forms an acute angle, fully utilize the structural strength of the frame 11, the upper shell 12 and the lower shell 13 of the box body 1, and increase the upper limit of the constraint pressure of the solid-state battery 2.

[0090] The storage device comprises one or more battery clusters to improve the voltage and capacity of the storage device. The battery cluster can comprise multiple battery devices, and the multiple battery devices are connected in series by a busbar to improve the voltage of the storage device. When the storage device comprises multiple battery clusters, the multiple battery clusters are connected in parallel to improve the capacity of the storage device.

[0091] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device can store electric energy during a low electricity consumption period, and provide electric energy for a related user or electric device during a high electricity consumption period. The energy storage system provided by the embodiments of the present application can be any power system that needs to use an energy storage device.

[0092] The embodiments of the present application also provide an energy storage system, comprising: a power conversion device and a plurality of energy storage devices according to any one of the embodiments described above, wherein the power conversion device is used to electrically connect a power generation device and the energy storage devices.

[0093] According to the energy storage system provided by the embodiments of the present application, the energy storage device can realize the functions of the energy storage device.

[0094] The energy storage system can include one or more energy storage devices and a power conversion device (PCS). The power conversion device is used to connect between a power generation device and the energy storage devices. The power generation device is used to generate electric energy. The electric energy generated by the power generation device can be stored in the energy storage devices through the power conversion device. As an example, the power generation device can be a solar panel, a water power generation device, a fire power generation device, a wind power generation device, etc. The specific type of the power generation device is not limited in the present application.

[0095] The technical solutions described in the embodiments of the present application are applicable to various electric devices using the energy storage system, such as a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship, and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc. The energy storage device is used to store or provide electric energy.

[0096] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents a "or" relationship between the front and rear associated objects.

[0097] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "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 based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0098] In the description of the application, "first feature" and "second feature" can include one or more of the features.

[0099] In the description of the application, "a plurality of" means two or more.

[0100] In the description of the application, "above" or "below" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.

[0101] In the description of the application, "above", "over" and "on" the first feature of the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0102] In the description of the application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0103] Although embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: The box-like structure forms a receiving cavity; Multiple batteries are housed in the receiving cavity, and the multiple batteries are stacked along a first direction, with the stacking surfaces of the multiple batteries forming an acute angle with the first direction; A protective cavity is formed between the battery and the housing at both ends along the first direction. The length of the protective cavity along the first direction at each point along the second direction is monotonic. The protective cavity is provided with an anti-expansion structure. The battery has a rectangular cross-section, and the side of the multiple batteries stacked along the first direction is serrated along the second direction. A limiting member is provided on the side of the multiple batteries stacked along the first direction along the second direction. The side of the limiting member away from the battery is planar, and the side of the limiting member facing the battery is serrated.

2. The battery device according to claim 1, characterized in that, The anti-expansion structure is an elastic element, or the anti-expansion structure has a cavity.

3. The battery device according to claim 1, characterized in that, The limiting component is a filler adhesive.

4. The battery device according to any one of claims 1-2, characterized in that, The battery has a parallelogram cross-section, and the multiple batteries are stacked along a first direction and then aligned along the sides of a second direction.

5. A vehicle, characterized in that, include: Multiple battery devices as described in any one of claims 1-4.

6. An energy storage device, characterized in that, include: The battery devices as described in any one of claims 1-4, wherein the battery devices are used to store or provide electrical energy.

7. An energy storage system, characterized in that, include: The power conversion device and the energy storage device as described in claim 6, wherein the power conversion device is used to electrically connect the power generation equipment and the energy storage device.

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