Battery device and electric equipment

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery device and electric equipment. The battery device comprises: a plurality of battery cells; the box main body comprises a plurality of box body beams, the plurality of box body beams are connected end to end to form an assembly space with an assembly inlet, and the plurality of single batteries are arranged in the assembly space; the insulating pressing plate covers the single battery and abuts against at least part of the side wall, facing the assembly inlet, of the single battery; and the plurality of pressing strips are arranged on the insulating pressing plate at intervals, the two ends of each pressing strip are locked on the box body beam, and each pressing strip simultaneously abuts against the shoulder parts of the side walls of the plurality of single batteries. By applying the technical scheme, the problem that the overall service life of the battery device is affected due to the expansion condition of the battery monomers in the battery device in the repeated charging and discharging process is solved.

Description

Technical Field

[0001] This application belongs to the field of battery equipment technology, and in particular relates to a battery device and an electrical device. Background Technology

[0002] Current battery devices consist of a battery casing and multiple battery cells. The battery cells are installed inside the casing and are used to store electrical energy or supply power. During use, the battery cells need to be repeatedly charged and discharged. During this repeated charging and discharging process, the internal pressure of the battery cells continuously increases, causing the battery cell casings to bulge and deform, thus affecting the overall lifespan of the battery device. Utility Model Content

[0003] The purpose of this application is to provide a battery device and electrical equipment, including but not limited to solving the problem that the battery cells in the battery device will expand during repeated charging and discharging, which will affect the overall service life of the battery device.

[0004] To achieve the above objectives, according to a first aspect of an embodiment of this application, a battery device is provided, comprising:

[0005] Multiple battery cells;

[0006] The main body of the box includes multiple box beams, which are connected end to end to form an assembly space with an assembly entrance, and multiple battery cells are set in the assembly space.

[0007] An insulating pressure plate covers the battery cell and abuts against at least a portion of the sidewall of the battery cell facing the assembly inlet;

[0008] Multiple pressure strips are spaced apart on the insulating pressure plate. Both ends of the pressure strips are locked to the box beam, and each pressure strip simultaneously abuts against the shoulder of the side wall of several battery cells.

[0009] In the battery device provided by the embodiments of the present application, when the plurality of battery monomers are installed into the assembly space of the box body from the assembly entrance, the insulating pressing plate is used to cover at least part of the side wall of the battery monomer facing the assembly entrance, and the plurality of pressing strips are connected to the box beam of the box body, the pressing strips press against the shoulder of the side wall of the plurality of battery monomers facing the assembly entrance, and the plurality of pressing strips and the insulating pressing plate are connected to each other to form a whole structure that abuts against the side wall of the battery monomer facing the assembly entrance. In this way, compared with the related art which only uses the elongated pressing strip to press against the shoulder of the shell of the battery monomer to limit the internal expansion force in the Z direction, the battery device of the embodiments of the present application uses the plurality of pressing strips and the insulating pressing plate to form a whole structure that abuts against the side wall of the battery monomer facing the assembly entrance, thereby limiting the internal expansion force in the Z direction. The whole structure formed by the plurality of pressing strips and the insulating pressing plate has higher strength, and the insulating pressing plate is used to press against most of the side wall of the shell of the battery monomer facing the assembly entrance, which greatly improves the ability to prevent the shell of the battery monomer from being deformed due to the internal expansion force in the Z direction, effectively prevents the battery monomer from swelling during repeated charging and discharging, and is beneficial to prolonging the service life of the battery monomer and the service life of the battery device.

[0010] In some embodiments of the present application, the plurality of battery monomers are arranged as a plurality of battery monomer assemblies in series. By dividing the plurality of battery monomers into a plurality of battery monomer assemblies, the battery monomers can be optimized and managed in the use of the battery device. The plurality of battery monomer assemblies are arranged in parallel in the assembly space, which can reasonably optimize the utilization of the rectangular assembly space and improve the energy density of the battery device. The extension direction of the pressing strip is consistent with the extension direction of the battery monomer assembly, and one battery monomer assembly corresponds to at least one pressing strip, so that the battery monomers can be pressed and limited by as few pressing strips as possible.

[0011] In some embodiments of the present application, one battery monomer assembly corresponds to two adjacent pressing strips, and the two adjacent pressing strips abut against the two side shoulders of the side wall, respectively. The two pressing strips and the part of the insulating pressing plate between the two pressing strips form a set of limiting units, and one side of the battery monomer assembly facing the assembly entrance is pressed and limited by the set of limiting units, so as to limit the internal expansion force in the Z direction of each battery monomer of the battery monomer assembly.

[0012] In some embodiments of the present application, a pressing strip is arranged between two adjacent battery monomer assemblies, and the two side edges of the pressing strip abut against the shoulders of the two adjacent battery monomer assemblies, respectively.

[0013] In some embodiments of the present application, the battery cell comprises a shell and a pole post structure, the pole post structure is arranged on the side wall of the shell facing the assembly entrance, the pole post structure faces the assembly entrance, the insulation pressing plate is provided with a plurality of avoiding holes, the plurality of pole post structures are correspondingly arranged in the plurality of avoiding holes, and the insulation pressing plate abuts against the side wall of the shell facing the assembly entrance. In this embodiment, the battery cell is assembled into the assembly space in a positive assembly mode.

[0014] In some embodiments of the present application, the battery cell further comprises a pressure relief structure arranged on the side wall of the shell facing the assembly entrance, and the insulation pressing plate is further provided with a plurality of pressure relief through holes, and the plurality of pressure relief structures of the battery cell are correspondingly arranged in the plurality of pressure relief through holes. The pressure relief through holes on the insulation pressing plate avoid the pressure relief structure, which neither hinders the pressure relief structure from being actuated to open when thermal runaway occurs, nor blocks the high-temperature flue gas flowing through the pressure relief structure, so that the high-temperature flue gas in the battery cell is smoothly discharged from the pressure relief structure.

[0015] In some embodiments of the present application, the pressing strip is a component made of metal material, and the pole post structure is insulated from the pressing strip. The pressing strip made of metal material itself has high strength, which meets the strength requirement of the battery device for the pressing strip.

[0016] In some embodiments of the present application, the pressing strip is connected to the plate surface of the insulation pressing plate. In some embodiments of the present application, the pressing strip is located on the plate surface of the insulation pressing plate away from the battery cell. In this way, the manufacturing process and assembly process of the pressing strip and the insulation pressing plate are simplified, and the processing difficulty is reduced.

[0017] In some embodiments of the present application, the battery device further comprises a structural adhesive layer, and the insulation pressing plate is bonded to the battery cell through the structural adhesive layer. The relative positions between the insulation pressing plate and the battery cell and between the pressing strip and the battery cell can be stabilized through the structural adhesive layer, and the possibility of positional deviation between the insulation pressing plate and the battery cell and between the pressing strip and the battery cell is reduced.

[0018] In some embodiments of the present application, the pressing strip is embedded in the insulation pressing plate.

[0019] In some embodiments of the present application, the battery device further comprises a structural beam, two ends of the structural beam are connected to the two opposite and parallel box beams and located in the assembly space, the extension direction of the structural beam is parallel to the extension direction of the other box beam opposite to the structural beam, one end of the pressing strip is locked to the structural beam, and the other end of the pressing strip is locked to the box beam opposite to the structural beam. In some embodiments of the present application, the battery device further comprises a plurality of structural beams, two ends of the plurality of structural beams are connected to the two opposite and parallel box beams, the plurality of structural beams are spaced apart and parallel to each other in the assembly space, and the extension direction of the structural beam is parallel to the extension direction of the box beam opposite to the structural beam; one end of a part of the pressing strip is locked to the box beam, and the other end of the pressing strip is locked to the structural beam adjacent to the box beam; the two ends of another part of the pressing strip are locked to the two adjacent structural beams, respectively. The structural beam enhances the overall mechanical strength of the box body, so that the overall mechanical strength of the box body can meet the strength requirements of the battery device in assembly, use, etc.

[0020] According to a second aspect of the embodiments of the present application, a power utilization device is provided. The power utilization device comprises a power utilization load; and the power utilization device further comprises the battery device as described above, and the power utilization load is electrically connected to the battery device, wherein the battery cell or the battery device is used for storing or providing electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0022] Figure 1 A perspective view of a battery cell of the battery device according to an embodiment of the present application;

[0023] Figure 2 An exploded view of a battery device according to an embodiment of the present application;

[0024] Figure 3 An exploded view of another battery device according to an embodiment of the present application;

[0025] Figure 4 A top view of still another battery device according to an embodiment of the present application, wherein the box cover is removed;

[0026] Figure 5 A view of Figure 4 A partial cross-sectional view in direction A-A;

[0027] Figure 6 A view of Figure 5 An enlarged view at position B;

[0028] Figure 7 Assembling structure of the insulating pressing plate and the pressing strip in the battery device of the embodiment of the present application Figure 1 ;

[0029] Figure 8 Assembling structure of the insulating pressing plate and the pressing strip in the battery device of the embodiment of the present application Figure 2 ;

[0030] Figure 9 Structure schematic diagram of a power consuming device of the embodiment of the present application.

[0031] In the drawings, various reference signs refer to the following items:

[0032] 100, battery monomer;

[0033] 101, battery monomer assembly; 102, shell; 103, top wall; 104, shoulder; 105, pole structure; 106, pressure relief structure;

[0034] 200, battery device;

[0035] 201, box body; 202, box beam; 203, assembling space; 204, assembling entrance; 205, box cover; 206, insulating pressing plate; 207, avoiding hole; 208, pressure relief through hole; 209, pressing strip; 210, structure beam; 211, structure adhesive layer; 212, gasket;

[0036] 400, power consuming device; 410, power consuming load; 420, control device; 430, vehicle frame; 440, vehicle wheel. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein 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 drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0038] In the description of the present application, it is understood that the orientations or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0039] In addition, the terms "first", "second", and the like are used only for descriptive purposes, and should not be construed as indicating or implying relative importance or an indicated number of the technical features indicated. Therefore, the features defined as "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0040] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station (the battery device of this kind of application is generally called energy storage battery), but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields (the battery device of this kind of application is generally called power battery). With the continuous expansion of the application field of battery device, the application is gradually widespread, and the market's requirement for the service life of battery device is also increasing.

[0042] The battery device includes a plurality of battery monomers, the plurality of battery monomers are installed in the battery box body, and the plurality of battery monomers are connected in series, parallel or mixed connection through the gasket, so as to meet the rated output voltage and rated output current requirements of the battery device. It can be seen that the service life of the battery monomer is one of the key factors to determine the service life of the battery device.

[0043] The current battery device includes a battery box body and a plurality of battery monomers, the plurality of battery monomers are installed in the battery box body, and the plurality of battery monomers are used for storing electric energy or power supply. The battery monomer needs to be repeatedly charged and discharged in the process of use, the active material of the electrode assembly inside the battery monomer and the electrolyte repeatedly occur reversible electrochemical reaction, gas is generated in the long-term reaction process and retained in the inside of the battery monomer, which causes the internal pressure of the battery monomer to continuously rise. Under the action of the continuously rising internal pressure, the shell of the battery monomer is deformed and bulges, which affects the service life of the battery monomer, and then affects the overall service life of the battery device.

[0044] The internal expansion force caused by the increase of the internal air pressure of the battery cell is a full three-dimensional force acting on the shell, that is, any position of the inner wall of the shell of the battery cell is subjected to the internal expansion force. Among them, when the shell of the battery cell is deformed to bulge, for the internal expansion force acting on the circumferential side wall of the shell (this part of the expansion force is generally simplified as two forces perpendicular to the X direction and the Y direction in the horizontal plane, as shown in Figure 1 The related art generally uses a steel band or utilizes the cross beam and / or longitudinal beam of the battery box of the battery device to limit and offset. For the internal expansion force acting along the height direction of the battery cell, such as Figure 1 The internal expansion force acting on the top wall and the bottom wall of the shell in the Z direction, the related art generally only uses a pressing strip to be locked to the battery box to press the shoulder of the battery cell, that is, the pressing strip and the bottom plate of the battery box together clamp and limit the internal expansion force in the Z direction to which the shell of the battery cell is subjected. However, in order to avoid the assembly position of the pressing strip from other components, that is, to prevent the pressing strip from interfering with the assembly of other components, the pressing strip must be thin and long. This results in insufficient strength and obvious bending of the pressing strip itself, and the pressing strip is easy to bend with the bulging deformation of the shell of the battery cell, and the ability of the pressing strip to limit the bulging deformation of the shell of the battery cell is very limited, which affects the service life of the battery cell. Moreover, the small contact area of the thin and long pressing strip abutting against the shoulder of the shell makes most of the top wall or the bottom wall of the shell not be limited, and the area of the top wall or the bottom wall of the shell not subjected to the limitation of the internal expansion force is still easy to cause the bulging deformation of these areas, which affects the service life of the battery cell.

[0045] Based on the above considerations, embodiments of this application provide a battery device. When multiple battery cells are installed into the assembly space of the main body through an assembly inlet, an insulating pressure plate covers the sidewall of the battery cells facing the assembly inlet. Simultaneously, multiple pressure strips are connected to the box beams of the main body. The pressure strips press against the shoulders of the sidewalls of the battery cells facing the assembly inlet. Furthermore, the multiple pressure strips and the insulating pressure plate are interconnected to form a mutually cooperating integral structure that abuts against at least a portion of the sidewall of the battery cells facing the assembly inlet. Thus, compared to related technologies that only use slender pressure strips to press against and restrict the shoulders of the battery cell casing to limit the internal expansion force in the Z direction, the battery device of this application uses multiple pressure strips and the insulating pressure plate interconnected to form a mutually cooperating integral structure. This integral structure abuts against the sidewall of the battery cells facing the assembly inlet, thereby limiting the internal expansion force in the Z direction. Among them, the overall structure formed by multiple pressure strips and insulating pressure plates has higher strength. Moreover, by using the insulating pressure plates to press and restrict most of the area of ​​the battery cell casing facing the assembly entrance, the ability to limit the battery cell casing from bulging and deformation caused by the internal expansion force in the Z direction is greatly improved. This can effectively suppress the expansion of the battery cell during repeated charging and discharging, which is conducive to improving the service life of the battery cell and thus improving the overall service life of the battery device.

[0046] To illustrate the technical solutions provided by the embodiments of this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0047] According to a first aspect of the embodiments of this application, embodiments of this application provide a battery device 200. For example... Figures 1 to 8 As shown, the battery device 200 includes a housing body 201, an insulating pressure plate 206, multiple pressure strips 209, and multiple battery cells 100. The housing body 201 includes multiple housing beams 202, which are connected end-to-end to form an assembly space 203 with an assembly entrance 204. Multiple battery cells 100 are disposed within the assembly space 203. The insulating pressure plate 206 covers the battery cells 100 and abuts against at least a portion of the sidewalls of the battery cells 100 facing the assembly entrance 204. Multiple pressure strips 209 are spaced apart on the insulating pressure plate 206, with both ends of each pressure strip locked to the housing beams 202. Each pressure strip 209 simultaneously abuts against the shoulder 104 of the sidewalls of several battery cells 100.

[0048] The box beam 202 can be a profiled beam plate, which is internally formed with a cavity and a reinforcing rib, so that the profiled beam plate itself has high mechanical strength, that is, the box body 201 itself has high mechanical strength, which can meet the strength requirements of the battery device 200 in assembly, use, etc. The use of the profiled beam plate can save the reinforcing structures or components such as reinforcing ribs, cross beams or longitudinal beams, which not only simplifies the design structure of the box body 201, but also reduces the use of materials of the box body 201 and the weight of the box body 201, which is conducive to reducing the overall weight of the battery device 200 and achieving light weight.

[0049] In some embodiments of the present application, the smaller battery device 200, the box beam 202 can also be a side beam, and the four wall plates of the box body 201 are all single-layer thin-walled plates (at this time, the four wall plates are connected in a head-to-tail manner to form a rectangular assembly space 203), and the mechanical strength of the single-layer thin-walled wall plate is insufficient, therefore, the four side beams are correspondingly arranged on the inner walls of the four wall plates, which are used to enhance the mechanical strength of the single-layer thin-walled wall plate, thereby assisting to enhance the overall mechanical strength of the box body 201, so that the overall mechanical strength of the box body 201 can meet the strength requirements of the battery device 200 in assembly, use, etc.

[0050] In the embodiments of the present application, the box beam 202 is preferably a profiled beam plate.

[0051] In the battery device 200 provided by the embodiments of the present application, when the plurality of battery monomers 100 are installed into the assembly space 203 of the box body 201 from the assembly entrance 204, the insulating pressing plate 206 is used to cover at least part of the side wall of the battery monomer 100 towards the assembly entrance 204, and at the same time, the plurality of pressing strips 209 are connected to the box beam 202 of the box body 201, the pressing strips 209 press against the shoulder part 104 of the side wall of the battery monomer 100 towards the assembly entrance 204, and the plurality of pressing strips 209 and the insulating pressing plate 206 are connected to each other to form a whole structure that cooperates with each other and abuts against the side wall of the battery monomer 100 towards the assembly entrance 204. In this way, compared with the related art which only uses an elongated pressing strip to press against the shoulder part of the shell of the battery monomer to limit the internal expansion force in the Z direction, the battery device 200 of the embodiments of the present application uses the plurality of pressing strips 209 and the insulating pressing plate 206 to form a whole structure that cooperates with each other, and the whole structure formed by the plurality of pressing strips 209 and the insulating pressing plate 206 abuts against the side wall of the battery monomer 100 towards the assembly entrance 204, thereby limiting the internal expansion force in the Z direction. The whole structure formed by the plurality of pressing strips 209 and the insulating pressing plate 206 has higher strength, and by pressing against most of the side wall of the shell 102 of the battery monomer 100 towards the assembly entrance 204 through the insulating pressing plate 206, the ability to prevent the shell 102 of the battery monomer 100 from being deformed due to the internal expansion force in the Z direction is greatly improved, which can effectively prevent the battery monomer 100 from swelling during repeated charging and discharging, and is conducive to improving the service life of the battery monomer 100, and in turn is conducive to improving the overall service life of the battery device 200.

[0052] In addition, the insulating pressing plate 206 cooperates with the plurality of pressing strips 209 to limit the battery monomer 100 in the assembly space 203, which can firmly and stably press the battery monomer 100 against the bottom plate of the box body 201, preventing the battery monomer 100 from loosening and shaking relative to the box body 201.

[0053] In the embodiments of the present application, the battery monomer 100 can be a secondary battery, which refers to a battery monomer 100 that can be activated by charging after discharging. The battery monomer 100 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., and the embodiments of the present application are not limited thereto. In addition, the battery monomer 100 provided by the embodiments of the present application is a square battery monomer, also known as a square monomer. Of course, the battery monomer 100 can also be a cylindrical battery monomer, also known as a cylindrical monomer. The battery device 200 assembled by the square battery monomer 100 or the cylindrical battery monomer 100 is generally square in shape, also known as a square battery.

[0054] The following description uses a prismatic cell assembly battery device 200 (i.e., a prismatic battery) as an example. The implementation scheme for assembling a prismatic cell battery device 200 can be found in the implementation scheme for assembling a prismatic cell battery device 200, and will not be repeated here.

[0055] In some embodiments of this application, such as Figures 2 to 8 As shown, in the battery device 200, multiple battery cells 100 are arranged into multiple battery cell assemblies 101 in a straight line, and the multiple battery cell assemblies 101 are arranged side by side in the assembly space 203. An insulating pressure plate 206 covers and abuts against the side of all battery cell assemblies 101 facing the assembly inlet 204. The extending direction of pressure strips 209 provided on the insulating pressure plate 206 is consistent with the extending direction of the battery cell assemblies 101, and each battery cell assembly 101 corresponds to at least one pressure strip 209. The integral structure formed by the multiple pressure strips 209 and the insulating pressure plate 206 abuts against the side of all battery cell assemblies 101 facing the assembly inlet 204, thereby limiting the internal expansion force in the Z direction experienced by the housing 102 of each battery cell 100. The overall structure formed by multiple pressure strips 209 and insulating pressure plate 206 has higher strength than that of individual pressure strips 209. Furthermore, the insulating pressure plate 206 presses down on most of the sidewall of each battery cell 100's casing 102 facing the assembly inlet 204, significantly improving the ability to prevent bulging deformation of the casing 102 of each battery cell 100 due to internal expansion forces in the Z direction. This effectively suppresses expansion of the battery cell 100 during repeated charging and discharging, improving the lifespan of the battery cell 100 and consequently, the overall lifespan of the battery device 200. In this battery device 200, each battery cell assembly 101 is a battery unit composed of several battery cells 100. By dividing multiple battery cells 100 into modular battery units such as several battery cell assemblies 101, optimized management of all battery cells 100 is facilitated during the use of the battery device 200. Furthermore, the parallel arrangement of multiple battery cell assemblies 101 within the assembly space 203 optimizes the utilization of the rectangular assembly space 203 and improves the energy density of the battery device 200. To achieve the goal of effectively compressing and restricting all battery cells 100 using as few pressure strips 209 as possible, the battery device 200 aligns the extension direction of the pressure strips 209 with the extension direction of the battery cell assemblies 101. Each battery cell assembly 101 corresponds to at least one pressure strip 209, and the insulating pressure plate 206 compresses and restricts most of the area of ​​the sidewall of the housing 102 of each battery cell 100 facing the assembly entrance 204.

[0056] In some embodiments of the battery device 200 of the present application, one battery cell assembly 101 corresponds to two adjacent pressing strips 209, and the two adjacent pressing strips 209 respectively abut against the two side shoulders 104 of the side wall. That is, the two side shoulders 104 of the side wall of each battery cell assembly 101 towards the assembly entrance 204 are respectively pressed by one pressing strip 209. And for each battery cell assembly 101, the two pressing strips 209 and the part of the insulation pressing plate 206 between the two pressing strips 209 form a set of limiting units, that is, one side of each battery cell assembly 101 towards the assembly entrance 204 is pressed and limited by a set of limiting units, so as to limit the Z-direction internal expansion force suffered by each battery cell 100 of the battery cell assembly 101. In this embodiment, any two adjacent sets of limiting units are independent of each other and are connected as a whole only by the overall insulation pressing plate 206.

[0057] In some other embodiments of the battery device 200 of the present application, as shown in Figures 2 to 8 , one pressing strip 209 is arranged between two adjacent battery cell assemblies 101, and the two side edges of the pressing strip 209 respectively abut against the shoulders 104 of the two adjacent battery cell assemblies 101. That is, each pressing strip 209 simultaneously presses the adjacent shoulders 104 of the two adjacent battery cell assemblies 101, and along the direction in which the plurality of battery cell assemblies 101 are arranged side by side, the outermost shoulders 104 of the two outermost battery cell assemblies 101 are no longer provided with a pressing strip 209, but are covered by the two side edge regions of the insulation pressing plate 206 towards the side wall of the assembly entrance 204, so as to limit the Z-direction internal expansion force suffered by each battery cell 100 of the two battery cell assemblies 101. For the battery cell assemblies 101 other than the two outermost battery cell assemblies 101, the two adjacent pressing strips 209 and the part of the insulation pressing plate 206 between the two adjacent pressing strips 209 form a set of limiting units, which limit the Z-direction internal expansion force suffered by each battery cell 100 of the battery cell assembly 101. In this embodiment, any two adjacent sets of limiting units are associated with each other, that is, the two adjacent sets of limiting units share a corresponding pressing strip 209, and are connected as a whole by the overall insulation pressing plate 206.

[0058] In some embodiments of the battery device 200 of the present application, as shown in Figure 1 , Figures 4 to 8As shown, the battery cell 100 includes a shell 102 and a pole structure 105, the pole structure 105 is arranged on the side wall of the shell 102 facing the assembly entrance 204 (generally referred to as the top wall 103 of the shell 102), the pole structure 105 faces the assembly entrance 204, and the assembly mode of the battery cell 100 is called the positive assembly mode. The insulating pressing plate 206 is provided with a plurality of avoiding holes 207, and the plurality of pole structures 105 are correspondingly arranged in the plurality of avoiding holes 207. Then, the pole structures 105 of the plurality of battery cells 100 are connected in series, parallel or mixed connection through the clamps 212, and the insulating pressing plate 206 is abutted to the top wall 103 when the pressing strips 209 are locked to the box beams 202 of the box body 201 at both ends. And the bottom wall of the shell 102 of the battery cell 100 away from the top wall 103 is abutted on the bottom plate of the box body 201. In this way, the insulating pressing plate 206, the plurality of pressing strips 209 and the bottom plate of the box body 201 jointly clamp the battery cell 100, thereby limiting the Z-direction internal expansion force received by the battery cell 100.

[0059] In some embodiments of the present application, the clamp 212 is welded to the corresponding pole structure 105. Among them, the welding process includes but is not limited to welding the clamp 212 and the corresponding pole structure 105 by adopting a laser welding process, an electric arc welding process and the like. Compared with the prior art, the embodiments of the present application preferably adopt the laser welding process to weld the clamp 212 and the corresponding pole structure 105, which can better realize automatic and intelligent production and improve the assembly efficiency. In some other embodiments of the present application, the clamp 212 and the corresponding pole structure 105 are connected by screw locking. By screwing the clamp 212 and the corresponding pole structure 105, the stability of the connection can be guaranteed, and the connection efficiency is higher. Moreover, when the battery cell 100 in the battery device 200 needs to be maintained or replaced, the screw can be disassembled to facilitate the maintenance or replacement of the faulty battery cell 100, and after the maintenance or replacement of the battery cell 100 is completed, the clamp 212 and the corresponding pole structure 105 can be relocked by the screw.

[0060] Of course, in some other embodiments of the present application, the battery cell 100 can also be installed in the assembly space 203 in the reverse assembly mode, that is, the bottom wall of the shell 102 of the battery cell 100 faces the assembly entrance 204, and the top wall 103 of the shell 102 of the battery cell 100 faces the bottom plate of the box body 201 (i.e. the pole structure 105 faces the bottom plate of the box body 201). In this embodiment, the insulating pressing plate 206 covers and abuts the bottom wall of the shell 102 of the battery cell 100, and the pressing strip 209 abuts the shoulder 104 of the bottom wall.

[0061] In the present application, the "shoulder 104" refers to the area between the edge of the side wall of the shell 102 towards the assembly inlet 204 and the adjacent pole structure 105. When the side wall of the shell 102 with the pole structure 105 is towards the bottom plate of the box body 201, the shoulder 104 refers to the area in the side wall of the shell 102 towards the assembly inlet 204, which corresponds to the area between the edge of the side wall of the shell 102 with the pole structure 105 and the adjacent pole structure 105.

[0062] As shown in Figure 1 and Figure 8 In some embodiments of the present application, the battery monomer 100 further comprises a pressure relief structure 106 arranged on the top wall 103. In order to smoothly discharge the high-temperature flue gas inside the battery monomer 100 from the pressure relief structure 106 when thermal runaway occurs inside the battery monomer 100, the insulation pressing plate 206 is further provided with a plurality of pressure relief through holes 208, and the plurality of pressure relief structures 106 of the battery monomer 100 are arranged one-to-one with the plurality of pressure relief through holes 208. In this way, the pressure relief through holes 208 on the insulation pressing plate 206 avoid the pressure relief structure 106, neither hindering the pressure relief structure 106 from actuating to open when thermal runaway occurs, nor blocking the high-temperature flue gas flowing through the pressure relief structure 106, so that the high-temperature flue gas inside the battery monomer 100 is smoothly discharged from the pressure relief structure 106.

[0063] In some embodiments of the present application, the pressing strip 209 is a component made of metal material, and the pole structure 105 is insulated from the pressing strip 209. The pressing strip 209 made of metal material itself has high strength, which meets the strength requirement of the battery device 200 for the pressing strip 209. Preferably, the pressing strip 209 is made of aluminum alloy material, which has high strength and light weight, and is beneficial to reduce the overall weight of the battery device 200.

[0064] Of course, in other embodiments of the present application, the pressing strip 209 can also be made of non-metallic material with sufficient strength, which is not limited herein.

[0065] In some embodiments of the present application, as shown in Figures 4 to 8 The pressing strip 209 is connected to one side surface of the insulation pressing plate 206. That is, the pressing strip 209 is attached to the surface of the insulation pressing plate 206. In this way, the pressing strip 209 and the insulation pressing plate 206 can be respectively made and then connected to form an integral whole. As shown in Figures 4 to 8 The pressing strip 209 is located on the side surface of the insulation pressing plate 206 away from the battery monomer 100. In this way, the manufacturing and assembly processes of the pressing strip 209 and the insulation pressing plate 206 are simplified, and the processing difficulty is reduced.

[0066] Alternatively, in some embodiments of the present application, the pressing strip 209 can also be located on the side surface of the insulating pressing plate 206 facing the battery monomer 100. In order to enable the side surface of the insulating pressing plate 206 to abut against the side wall of the shell 102 of the battery monomer 100 and the pressing strip 209 to abut against the shoulder 104 of the side wall at the same time, in the present embodiment, the surface of the pressing strip 209 facing the battery monomer 100 is flush with the side surface of the insulating pressing plate 206 facing the battery monomer 100.

[0067] Alternatively, in some other embodiments of the present application, as shown in Figure 2 and Figure 3 , the pressing strip 209 can be embedded in the insulating pressing plate 206. That is, only the two ends of the pressing strip 209 extend out of the insulating pressing plate 206, and the other part of the pressing strip 209 is completely embedded in the insulating pressing plate 206 (only the two ends of the pressing strip 209 are exposed outside the insulating pressing plate 206, and the other part of the pressing strip 209 is completely wrapped by the insulating pressing plate 206). In the present embodiment, only the insulating pressing plate 206 directly abuts against the side wall of the shell 102 of the battery monomer 100 facing the assembly inlet 204.

[0068] In some embodiments of the present application, as shown in Figure 2 , Figure 3 and Figure 6 , the battery device 200 further comprises a structural adhesive layer 211, and the insulating pressing plate 206 and / or the pressing strip 209 are bonded to the battery monomer 100 through the structural adhesive layer 211. The structural adhesive layer 211 has good bonding performance, that is, even if the battery device 200 is subjected to external forces such as impact, the relative positions between the insulating pressing plate 206 and the battery monomer 100 and between the pressing strip 209 and the battery monomer 100 can be stabilized through the structural adhesive layer 211, and the possibility of positional deviation between the insulating pressing plate 206 and the battery monomer 100 and between the pressing strip 209 and the battery monomer 100 can be reduced. Moreover, when the pressing strip 209 is located on the side of the insulating pressing plate 206 facing the battery monomer 100 and directly abuts against the shoulder 104 of the side wall, the structural adhesive layer 211 is arranged between the pressing strip 209 and the shoulder 104, which can avoid the rigid abutment of the pressing strip 209 made of metal against the shoulder 104, thereby protecting the shell 102 from being pressed or extruded and deformed by the pressing strip 209.

[0069] In the smaller battery device 200 of some embodiments of the present application, the battery device 200 further comprises a structural beam 210, two ends of the structural beam 210 are connected to the two opposite and parallel box beams 202 respectively and located in the assembly space 203, the extending direction of the structural beam 210 is parallel to the extending direction of the other box beam 202 opposite to the structural beam 210, one end of the pressing strip 209 is locked to the structural beam 210, and the other end of the pressing strip 209 is locked to the box beam 202 opposite to the structural beam 210. The overall mechanical strength of the box body 201 is enhanced by the structural beam 210, so that the overall mechanical strength of the box body 201 can meet the strength requirements of the battery device 200 in assembly, use, etc.

[0070] In the larger battery device 200 of some embodiments of the present application, as shown in Figure 3 the battery device 200 further comprises a plurality of structural beams 210, two ends of the plurality of structural beams 210 are connected to the two opposite and parallel box beams 202, the plurality of structural beams 210 are spaced and parallel in the assembly space 203, and the extending direction of the structural beam 210 is parallel to the extending direction of the box beam 202 opposite to the structural beam 210; one end of a part of the pressing strip 209 is locked to the box beam 202, and the other end is locked to the structural beam 210 adjacent to the box beam 202; the two ends of another part of the pressing strip 209 are locked to the two adjacent structural beams 210 respectively. The overall mechanical strength of the box body 201 is enhanced by the structural beam 210, so that the overall mechanical strength of the box body 201 can meet the strength requirements of the battery device 200 in assembly, use, etc. Since the plurality of spaced and parallel structural beams 210 can provide connection positions for the two ends of the pressing strip 209, the pressing strip 209 does not need to use a longer size, thereby improving the bending resistance of the pressing strip 209 and improving the abutting ability of the pressing strip 209 to the shoulder 104 of the battery monomer 100.

[0071] The structural beam 210 is also commonly known as an expansion beam. The structural beam 210 not only assists in enhancing the overall mechanical strength of the box body 201, but also plays a role in positioning and fixing installation of the battery monomer assembly 101. Moreover, when the battery device 200 is subjected to external impact force, the structural beam 210 can withstand and offset the external impact force to a certain extent, i.e., the structural beam 210 plays an energy absorption role, thereby to a certain extent, preventing the external impact force from continuing to act on the battery monomer 100, preventing the battery monomer 100 from being damaged, and protecting the structural integrity of the battery monomer 100.

[0072] In some embodiments of the present application, the two ends of the pressing strip 209 are welded to the corresponding box beam 202 or structural beam 210, respectively. The welding process includes, but is not limited to, laser welding process, electric arc welding process, etc. for welding the two ends of the pressing strip 209 to the corresponding box beam 202 or structural beam 210, respectively. Compared with the prior art, the embodiments of the present application preferably use laser welding process to weld the two ends of the pressing strip 209 to the corresponding box beam 202 or structural beam 210, respectively, which can better realize automatic and intelligent production and improve assembly efficiency.

[0073] In some embodiments of the present application, the two ends of the pressing strip 209 are welded to the corresponding box beam 202 or structural beam 210, respectively. The welding process includes, but is not limited to, laser welding process, electric arc welding process, etc. for welding the two ends of the pressing strip 209 to the corresponding box beam 202 or structural beam 210, respectively. Compared with the prior art, the embodiments of the present application preferably use laser welding process to weld the two ends of the pressing strip 209 to the corresponding box beam 202 or structural beam 210, respectively, which can better realize automatic and intelligent production and improve assembly efficiency.

[0074] The battery device 200 further comprises a box cover 205, which covers the assembly inlet 204 of the box body 201. The box body 201 and the box cover 205 cover to form a sealed assembly space 203, and the plurality of battery monomers 100 are arrayed and assembled in the assembly space 203.

[0075] According to the second aspect of the embodiments of the present application, the embodiments of the present application further provide a power utilization device 400, which comprises a power utilization load 410 and the battery device 200 as described above, i.e. the power utilization device 400 adopts one battery device 200 or adopts a plurality of battery devices 200 in series, parallel or hybrid connection, and the power utilization load 410 is electrically connected with the battery device 200. The battery device 200 is used for storing electric energy, or the battery device 200 is used for providing electric energy to the power utilization load 410, so that the power utilization load 410 can normally operate.

[0076] The power utilization device 400 includes, but is not limited to, electric toys, electric tools, electric cars, electric vehicles, ships, spacecraft, etc. The electric toys can include, but are not limited to, fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc. The spacecraft can include, but is not limited to, airplanes, rockets, space shuttles and spaceships, etc.

[0077] The power utilization device 400 is an electric vehicle, and the battery device 200 is used for assembly, as shown in FIG. 1, wherein the box body 201 is arranged in the trunk of the electric vehicle, and the box cover 205 is arranged on the trunk of the electric vehicle. Figure 9As shown, the battery device 200 is mounted on a frame 430 of an electric vehicle. The electric vehicle comprises the frame 430, a driving motor and wheels 440, the battery device 200 and the driving motor are fixedly mounted on the frame 430, the wheels 440 are rotatably connected to the frame 430, and the battery device 200 is electrically connected to the driving motor, and the driving motor is drivingly connected to the wheels 440. The battery device 200 provided by the present application is applied to supply power for the driving motor (the driving motor is one of the power consumption loads 410 of the power consumption device 400), so that the driving motor drives the wheels 440 to rotate, so that the electric vehicle can normally travel. Moreover, the electric vehicle comprises a control device 420, the control device 420 is mounted on the frame 430, the control device 420 is electrically connected to the battery device 200, and the control device 420 is used to control and monitor the charging and discharging working state of the battery device 200. In some electric vehicles, the battery box of the battery device 200 can be used as a part of the chassis structure of the electric vehicle. For example, part of the battery box can be at least a part of the floor of the electric vehicle, or part of the battery box can be at least a part of the cross beam and the longitudinal beam of the electric vehicle.

[0078] The preferred embodiments of the present application have been described above with the preferred embodiments, but the present application is not limited to the above examples, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized by, The battery device comprises: a plurality of battery cells; a box body comprising a plurality of box beams, the plurality of box beams being connected end to end to form an assembly space with an assembly entrance, and the plurality of battery cells being arranged in the assembly space; an insulating pressing plate covering the battery cells and abutting against at least part of the side walls of the battery cells towards the assembly entrance; a plurality of pressing strips being arranged at intervals on the insulating pressing plate, both ends of the pressing strips being locked to the box beams, and each of the pressing strips abutting against the shoulder of the side walls of a plurality of battery cells.

2. The battery device according to claim 1, wherein the plurality of battery cells are arranged as a plurality of straight battery cell assemblies, and the plurality of battery cell assemblies are arranged side by side in the assembly space, the extension direction of the pressing strips being consistent with the extension direction of the battery cell assemblies, and one battery cell assembly corresponding to at least one pressing strip.

3. The battery device according to claim 2, wherein one battery cell assembly corresponds to two adjacent pressing strips, and the two adjacent pressing strips abut against the two side shoulders of the side walls, respectively.

4. The battery device according to claim 2 or 3, wherein one pressing strip is arranged between two adjacent battery cell assemblies, and the two side edges of the pressing strip abut against the shoulders of the two adjacent battery cell assemblies, respectively.

5. The battery device according to claim 4, wherein the battery cell comprises a shell and a pole structure, the pole structure being arranged on the side wall of the shell towards the assembly entrance, the pole structure facing the assembly entrance, the insulating pressing plate being provided with a plurality of avoiding holes, and a plurality of the pole structures being arranged in the plurality of avoiding holes one by one, and the insulating pressing plate abutting against the side wall of the shell towards the assembly entrance.

6. The battery device according to claim 5, wherein the battery cell further comprises a pressure relief structure arranged on the side wall of the shell towards the assembly entrance, and the insulating pressing plate is further provided with a plurality of pressure relief through holes, and the pressure relief structures of the plurality of battery cells are arranged in the plurality of pressure relief through holes one by one.

7. The battery device according to claim 5, wherein the pressing strip is a component made of metal material, and the pole structure is insulated from the pressing strip.

8. The battery device according to any one of claims 1-3, wherein the pressing strip is connected to the plate surface of the insulating pressing plate.

9. The battery device according to claim 8, wherein the pressing strip is located on the side plate surface of the insulating pressing plate away from the battery cell.

10. The battery device according to claim 9, wherein the battery device further comprises a structural adhesive layer, and the insulating pressing plate is bonded to the battery cell through the structural adhesive layer.

11. The battery device according to any one of claims 1-3, wherein the pressing strip is embedded in the insulating pressing plate.

12. The battery device according to claim 2 or 3, wherein The battery device further comprises a structural beam, two ends of the structural beam are connected to two opposite and parallel box beams respectively, the extending direction of the structural beam is parallel to the extending direction of the other box beam opposite to the structural beam, one end of the pressing strip is locked to the structural beam, and the other end of the pressing strip is locked to the box beam opposite to the structural beam.

13. The battery device according to claim 2 or 3, wherein, The battery device further comprises a plurality of structural beams, two ends of the plurality of structural beams are connected to two opposite and parallel box beams respectively, the plurality of structural beams are spaced and parallel, the extending direction of the structural beam is parallel to the extending direction of the box beam opposite to the structural beam; one end of a part of the pressing strip is locked to the box beam, and the other end is locked to the structural beam adjacent to the box beam; two ends of another part of the pressing strip are locked to two adjacent structural beams respectively.

14. An electrical device, characterized by The battery device further comprises a plurality of structural beams, two ends of the plurality of structural beams are connected to two opposite and parallel box beams respectively, the plurality of structural beams are spaced and parallel, the extending direction of the structural beam is parallel to the extending direction of the box beam opposite to the structural beam; one end of a part of the pressing strip is locked to the box beam, and the other end is locked to the structural beam adjacent to the box beam; two ends of another part of the pressing strip are locked to two adjacent structural beams respectively. The battery device further comprises a plurality of structural beams, two ends of the plurality of structural beams are connected to two opposite and parallel box beams respectively, the plurality of structural beams are spaced and parallel, the extending direction of the structural beam is parallel to the extending direction of the box beam opposite to the structural beam; one end of a part of the pressing strip is locked to the box beam, and the other end is locked to the structural beam adjacent to the box beam; two ends of another part of the pressing strip are locked to two adjacent structural beams respectively. The battery device further comprises a plurality of structural beams, two ends of the plurality of structural beams are connected to two opposite and parallel box beams respectively, the plurality of structural beams are spaced and parallel, the extending direction of the structural beam is parallel to the extending direction of the box beam opposite to the structural beam; one end of a part of the pressing strip is locked to the box beam, and the other end is locked to the structural beam adjacent to the box beam; two ends of another part of the pressing strip are locked to two adjacent structural beams respectively. The battery device further comprises a plurality of structural beams, two ends of the plurality of structural beams are connected to two opposite and parallel box beams respectively, the plurality of structural beams are spaced and parallel, the extending direction of the structural beam is parallel to the extending direction of the box beam opposite to the structural beam; one end of a part of the pressing strip is locked to the box beam, and the other end is locked to the structural beam adjacent to the box beam; two ends of another

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