Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a box body, a plurality of battery monomers and a limiting piece, the plurality of battery monomers are accommodated in the box body, each battery monomer comprises a shell and an electrode terminal, and the electrode terminal is arranged at the side part of the shell along a first direction. The limiting piece is arranged around at least one circle of the shell of at least one battery monomer in the first direction, and at least part of the limiting piece is clamped between two adjacent battery monomers, so that a first gap is formed between the at least two adjacent battery monomers. The battery device provided by the utility model is beneficial to simplifying the overall structure of the battery device, reducing the number of parts of the overall battery device, simplifying the assembly process of the battery device and improving the assembly efficiency of the battery device.

Description

TECHNICAL FIELD

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

[0002] The battery device is widely used in electronic equipment, such as mobile phone, notebook computer, electric vehicle, electric vehicle, electric aircraft, electric ship, electric toy car, electric toy ship, electric toy aircraft and electric tool, etc.

[0003] In the development of battery device technology, in addition to improving the use performance of battery device, the assembly efficiency of battery device is also a problem to be considered. Therefore, how to simplify the overall structure of battery device and improve the assembly efficiency of battery device is a continuous improvement problem in battery device technology. UTILITY MODEL CONTENT

[0004] The present application provides a battery device and a power consumption device, which is beneficial to simplify the structure of the battery device and improve the assembly efficiency of the battery device.

[0005] The present application is realized by the following technical scheme:

[0006] In a first aspect, the battery device provided by the embodiments of the present application comprises a box body, a plurality of battery monomers and a limiting piece. The plurality of battery monomers are accommodated in the box body. The battery monomer comprises a shell and an electrode terminal. The electrode terminal is arranged on the side of the shell along a first direction. The limiting piece is arranged around at least one shell of the battery monomer along at least one circumference. At least part of the limiting piece is arranged between two adjacent battery monomers, so that the first gap is formed between the two adjacent battery monomers.

[0007] The battery device provided by the embodiments of the present application is beneficial to simplify the overall structure of the battery device, reduce the number of parts of the battery device as a whole, simplify the assembly process of the battery device, and improve the assembly efficiency of the battery device.

[0008] According to some embodiments of the present application, the plurality of battery monomers are arranged at least along a second direction. The second direction is perpendicular to the first direction. One of any two adjacent battery monomers along the second direction is provided with the limiting piece.

[0009] In the above scheme, the first gap is formed between any two battery monomers adjacent in the second direction, the number of limiting members can be maximized, the overall structure of the battery device is simplified, and the assembly efficiency of the battery device is improved.

[0010] According to some embodiments of the application, the plurality of battery monomers are arranged in the second direction and the third direction, the first direction, the second direction and the third direction are perpendicular to each other, and one of any two battery monomers adjacent in the third direction is provided with a limiting member.

[0011] In the above scheme, the first gap is formed between any two battery monomers adjacent in the second direction and the third direction, the number of limiting members can be maximized, the overall structure of the battery device is simplified, and the assembly efficiency of the battery device is improved.

[0012] According to some embodiments of the application, the at least one limiting member is an elastic member, the elastic member is annular, and the elastic member is sleeved on the shell in the first direction.

[0013] In the above scheme, by setting the at least one limiting member as an elastic member, the connection between the elastic member and the shell is simplified, the assembly of the elastic member is facilitated, the assembly process of the battery device is further simplified, and the assembly efficiency of the battery device is improved.

[0014] According to some embodiments of the application, at least one battery monomer is provided with at least two limiting members, and the at least two limiting members are spaced apart in the first direction.

[0015] In the above scheme, the two limiting members adjacent in the first direction can provide a certain closing effect at both ends of the first gap in the first direction, reducing the risk of dust and other foreign matters entering the first gap from the end of the shell in the first direction and causing adverse effects on the battery monomer.

[0016] According to some embodiments of the application, the battery monomer comprises an electrode assembly, the electrode assembly is accommodated in the shell, the electrode assembly comprises an electrode body and a tab, the tab is led out from the end of the electrode body in the first direction, and in a direction perpendicular to the first direction, the electrode body is arranged in a different position from the limiting member in the orthographic projection of the shell.

[0017] In the above scheme, the risk of the limiting member affecting the normal expansion of the battery monomer by generating a binding force on the electrode tab, and further causing damage to the electrode tab of the electrode body, is reduced.

[0018] According to some embodiments of the present application, the battery cell comprises an electrode assembly accommodated in a shell, the electrode assembly comprising an electrode body and a tab led out from an end of the electrode body along a first direction. Along the first direction, the farthest distance d between the limiting piece and the end of the shell along the first direction satisfies: 10mm≤d≤15mm.

[0019] In the above scheme, by setting 10mm≤d≤15mm, even if the limiting piece has no overlap with the projection of the electrode body on the shell along the first direction as much as possible, the risk of the limiting piece generating a binding force on the electrode body is reduced, which is conducive to reducing the risk of damage to the electrode tab during the cycle expansion of the battery cell.

[0020] According to some embodiments of the present application, the limiting piece comprises a first part and a second part, the first part is arranged at the side of the battery cell along a second direction, and the second part is arranged at the side of the battery cell along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the size of the first part along the second direction is greater than the size of the second part along the third direction.

[0021] In the above scheme, the battery cell can have different sizes of the first gap on different sides, so as to more flexibly and reasonably set the thickness of the first part and the second part of the limiting piece according to the required size of the first gap, so as to improve the energy density of the battery device under the premise of meeting the expansion needs of the battery cell.

[0022] According to some embodiments of the present application, the size of the shell along the third direction is greater than the size of the shell along the second direction.

[0023] In the above scheme, the side of the battery cell along the second direction has a larger first gap, so as to meet the expansion needs of the electrode assembly, and further reduce the risk of damage to the electrode assembly due to expansion obstruction during the cycle operation.

[0024] According to some embodiments of the present application, the melting point T of the limiting piece satisfies: T≥60℃.

[0025] In the above scheme, by setting the melting point T of the limiting piece to be greater than or equal to 60℃, the structural stability of the limiting piece is improved during the cycle operation of the battery cell, and the risk of impurities entering the first gap through the battery cell along the first direction is reduced.

[0026] According to some embodiments of the present application, the limiting piece is adhesively connected with the shell.

[0027] In the above scheme, the connection stability of the limiting piece and the shell is improved, and the risk of the limiting piece falling off the shell is reduced.

[0028] According to some embodiments of the present application, the limiting member is located inside the shell in the orthographic projection of the shell along a direction perpendicular to the first direction.

[0029] In the above scheme, the risk of interference between the limiting member and other structures inside the battery device is reduced, and the risk of the limiting member being scratched and falling off the shell is reduced.

[0030] In the second aspect, the power consuming device provided by the embodiments of the present application comprises the battery device provided by any of the above embodiments, and the battery device is used to provide electric energy.

[0031] The power consuming device provided by the embodiments of the present application has the same technical effects as the battery device provided by the embodiments of the present application, and thus will not be described here.

[0032] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood by those skilled in the art through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0034] Figure 1 The structural schematic diagram of the vehicle provided by the embodiments of the present application is shown in the figure;

[0035] Figure 2 The structural schematic diagram of the battery device provided by the embodiments of the present application is shown in the figure;

[0036] Figure 3 The structural schematic diagram of the battery monomer group in the battery device provided by the embodiments of the present application is shown in the figure;

[0037] Figure 4 The structural schematic diagram of the explosion of the battery monomer in the battery device provided by the embodiments of the present application is shown in the figure;

[0038] Figure 5 The structural schematic diagram of the cooperation between the battery monomer and the limiting member in the battery device provided by the embodiments of the present application is shown in the figure;

[0039] Figure 6 The structural schematic diagram of the battery device provided by the embodiments of the present application is shown in the figure;

[0040] Figure 7 The front view of part of the structure in the battery device provided by the embodiments of the present application is shown in the figure;

[0041] Figure 8 A structure diagram of a limiting member in a battery device according to an embodiment of the present application is provided.

[0042] Figure 9 A structure diagram of a battery device according to another embodiment of the present application is provided.

[0043] Figure 10 A structure diagram of a battery device according to another embodiment of the present application is provided. Figure 9 A partial enlarged view of A in FIG. 10.

[0044] In the drawings, the drawings are not necessarily drawn to scale.

[0045] Explanation of reference numerals:

[0046] 1 - vehicle; 1a - motor; 1b - controller;

[0047] 10 - battery device; 11 - case; 111 - first sub-case; 112 - second sub-case; 10a - first gap;

[0048] 20 - battery cell group;

[0049] 30 - battery cell; 31 - outer shell; 311 - housing; 312 - end cover; 32 - electrode assembly; 321 - electrode body; 322 - tab; 33 - electrode terminal;

[0050] 40 - limiting member; 41 - first part; 42 - second part;

[0051] X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0054] Reference within this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described in this application can be combined with any of the other embodiments that are described in the application without mutual exclusivity.

[0055] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0056] The term "and / or" in this application is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0057] "Multiple" appearing in this application means two or more (including two), and similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0058] The battery device mentioned in the embodiments of the application can include one or more battery cell groups for providing voltage and capacity. The battery cell group can include a plurality of battery cells connected in series, in parallel, or in a hybrid manner through a busbar component.

[0059] In some embodiments, the battery cell group is usually formed by arranging a plurality of battery cells; as an example, the battery cell group can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0060] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell groups, and the battery cell groups are accommodated in the box body.

[0061] As an example, the battery cell group can be a battery module, and the battery cell group can be accommodated in the box body by fixing the battery module in the box body.

[0062] As an example, the battery cell group can also be accommodated in the case by directly fixing a plurality of battery cells to the case.

[0063] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0064] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0065] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0066] The battery cell can be, but is not limited to, 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.

[0067] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

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

[0069] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

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

[0071] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a positive electrode active material of a battery cell can also be used.

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

[0073] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver plating surface treatment, stainless steel with a silver plating surface treatment, copper, aluminum, a carbon electrode, carbon, nickel, titanium, or the like can be employed.

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

[0075] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material of a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0076] In some embodiments, the separator is a separation film. The present application does not particularly limit the type of the separation film, and any known porous structure separation film having good chemical stability and mechanical stability can be used.

[0077] As an example, the main material of the separation film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separation film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separation film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separation film can be a separate member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

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

[0079] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound to form the wound structure.

[0080] In some embodiments, the battery cell can include a shell. The shell is used to encapsulate components such as the electrode assembly and the electrolyte. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0081] In some embodiments, the shell includes an end cap and a shell body, the shell body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and the electrolyte and the like. The shell body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0082] In some embodiments, at least one electrode terminal is provided on the shell, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the shell body.

[0083] In some embodiments, an explosion-proof valve is provided on the shell. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0084] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or other shaped battery cells, the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc., and the embodiments of the present application are not particularly limited.

[0085] The battery cell will expand during the cyclic operation. In the related art, a limiting piece is attached between the battery cells by adhesion to allow a corresponding gap between the two adjacent battery cells. However, the limiting piece on the same surface of the battery cell usually includes multiple sections, and in the process of assembling the battery cell, multiple sections of the limiting piece need to be attached on the same surface respectively. Thus, the overall number of parts of the battery device is large, and the assembly process is complex, which is not conducive to improving the assembly efficiency of the battery device.

[0086] In view of this, the battery device provided by the embodiments of the present application includes a box body, a plurality of battery cells, and a limiting piece. The plurality of battery cells are accommodated in the box body. The battery cell includes a shell and an electrode terminal. The electrode terminal is arranged on the side of the shell along a first direction. The limiting piece is arranged around at least one shell of the battery cell for at least one turn. At least part of the limiting piece is clamped between two adjacent battery cells to allow a first gap between the at least two adjacent battery cells.

[0087] The battery device provided by the embodiments of the present application has the advantages that the battery device comprises a limiting piece, the limiting piece is arranged around the shell of at least one battery monomer, the limiting piece is used to make the first gap between the adjacent two battery monomers, the space is reserved for the expansion of the battery monomer, the overall structure of the battery device is simplified, the number of parts of the battery device is reduced, the assembly process of the battery device is simplified, and the assembly efficiency of the battery device is improved.

[0088] The technical solutions described in the embodiments of the present application are suitable for battery devices and electric devices using the battery devices.

[0089] The battery device disclosed by the embodiments of the present application can be used in electric devices such as vehicles, ships or aircrafts, etc. The power supply system of the electric device can be composed of the battery device disclosed by the present application.

[0090] The embodiments of the present application provide an electric device using the battery device as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0091] The following embodiments take a vehicle 1 as an example for convenience of description.

[0092] Please refer to Figure 1 , Figure 1 The vehicle 1 provided by the embodiments of the present application is shown in the structural schematic diagram. The vehicle 1 can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 1 is internally provided with a battery device 10, which can be arranged at the bottom, the head or the tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1, for example, the battery device 10 can be used as an operating power supply of the vehicle 1, which is used for the working power demand of the circuit system of the vehicle 1, such as the starting, navigation and running of the vehicle 1.

[0093] The vehicle 1 can further include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, for the working power demand of the starting, navigation and running of the vehicle 1.

[0094] In some embodiments of the present application, the battery device 10 can not only be used as an operating power supply of the vehicle 1, but also be used as a driving power supply of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0095] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in the embodiments of this application. Figure 3 This is a schematic diagram of the structure of the battery cell assembly 20 in the battery device 10 provided in this application embodiment. The battery device 10 includes a housing 11 and battery cells 30, with the battery cells 30 housed within the housing 11. The housing 11 provides a space for accommodating the battery cells 30, and the housing 11 can adopt various structures. In some embodiments, the housing 11 may include a first sub-housing 111 and a second sub-housing 112, which overlap each other, and together define a space for accommodating the battery cells 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-like structure. The first sub-box 111 covers the opening side of the second sub-box 112 so that the first sub-box 111 and the second sub-box 112 together define the accommodating space. Alternatively, the first sub-box 111 and the second sub-box 112 can both be hollow structures with one side open, and the opening side of the first sub-box 111 covers the opening side of the second sub-box 112.

[0096] In the battery device 10, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 30 are connected in both series and parallel configurations. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 30 is housed within the housing 11. Alternatively, the battery device 10 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed manner to form a battery cell group 20, and then the multiple battery cell groups 20 are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0097] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0098] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a single battery cell 30 in the battery device 10 provided in an embodiment of this application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals 33. The housing 31 includes a casing 311 and an end cap 312. The casing 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0099] The shell 311 is a component for fitting the end cover 312 to form an internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cover 312 can be independent components. The shell 311 can be in various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0100] The end cover 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cover 312 can be adapted to the shape of the shell 311 to fit the shell 311. Optionally, the end cover 312 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 312 is not easily deformed when subjected to extrusion collision, so that the battery cell 30 can have higher structural strength, and the reliability can also be improved. The end cover 312 can be provided with functional components such as the electrode terminal 33. The electrode terminal 33 can be used to electrically connect with the electrode assembly 32 for outputting or inputting the electrical energy of the battery cell 30. The material of the end cover 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 312, which can be used to isolate the electrical connection components in the shell 311 from the end cover 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0101] The electrode assembly 32 is a component in which electrochemical reactions occur in the battery cell 30. One or more electrode assemblies 32 can be contained in the shell 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and an isolation film is usually provided between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a part of the active material constituting the electrode body 321 of the electrode assembly 32, and a part of the positive electrode sheet and the negative electrode sheet each constitutes the tab 322. The positive electrode tab and the negative electrode tab can be located together at one end of the electrode body 321 or respectively at both ends of the electrode body 321. In the charging and discharging process of the battery cell 30, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 322 connects the electrode terminal 33 to form a current loop.

[0102] In a first aspect, as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 andFigure 7 As shown, the battery device 10 provided by the embodiments of the present application comprises a box body 11, a plurality of battery monomers 30 and a limiting member 40. The plurality of battery monomers 30 are accommodated in the box body 11. The battery monomer 30 comprises a shell 31 and an electrode terminal 33. The electrode terminal 33 is arranged at the side of the shell 31 along the first direction X. The limiting member 40 is arranged around at least one periphery of the shell 31 of the at least one battery monomer 30 along the first direction X. At least part of the limiting member 40 is clamped between the adjacent two battery monomers 30, so that the first gap 10a is formed between the at least two adjacent battery monomers 30.

[0103] The battery monomer 30 comprises the shell 31 and the electrode terminal 33. The electrode terminal 33 is arranged at the side of the shell 31 along the first direction X. Optionally, two electrode terminals 33 can be arranged at any side of the shell 31 along the first direction X, or one electrode terminal 33 can be arranged at each of the two sides of the shell 31 along the first direction X.

[0104] The limiting member 40 is arranged around at least one periphery of the shell 31 of the at least one battery monomer 30 along the first direction X. Optionally, the limiting member 40 can be arranged on all the battery monomers 30 of the battery device 10, or the limiting member 40 can be arranged on only part of the battery monomers 30 of the plurality of battery monomers 30. Exemplarily, the limiting member 40 can be arranged on only one of any two adjacent battery monomers 30. In this way, the first gap 10a can be formed between any two adjacent battery monomers 30, and the total number of the limiting members 40 can be reduced.

[0105] One battery monomer 30 can be provided with one limiting member 40, or one battery monomer 30 can be provided with at least two limiting members 40 arranged at intervals along the first direction X. The limiting member 40 can be arranged at the middle region of the shell 31 along the first direction X, or the limiting member 40 can be arranged at at least one end of the battery monomer 30 along the first direction X.

[0106] The limiting member 40 can be arranged beyond the end of the shell 31 along the first direction X, or the limiting member 40 can be arranged without exceeding the end of the shell 31 along the first direction X. The limiting member 40 can have a small size along the first direction X, so as to reserve a large first gap 10a for the battery monomer 30. Exemplarily, the size of the limiting member 40 along the first direction X can be between 10 mm and 20 mm.

[0107] Optionally, the limiting member 40 can be in a strip shape before assembly. During the assembly process, the limiting member 40 can be arranged around at least one periphery of the shell 31 along the first direction X. Alternatively, the limiting member 40 can be in a whole ring shape before assembly. During the assembly process, the limiting member 40 can be sleeved on the shell 31. The specific selection can be made according to actual needs.

[0108] The limiting member 40 can have a certain elasticity, and through the elastic force of the limiting member 40 itself, the limiting member 40 is more stably connected to the shell 31. Alternatively, the limiting member 40 can not have any elasticity, and through the tension of the limiting member 40, the limiting member 40 is more stably connected to the shell 31. Of course, the limiting member 40 can also be more stably connected to the shell 31 by adhesion or the like.

[0109] The thicknesses of different limiting members 40 can be the same or different, so that the first gaps 10a between different battery monomers 30 can be the same or different. Similarly, the thicknesses of different parts of the same limiting member 40 can be the same or different, so that the first gaps 10a of different sides of the same battery monomer 30 can be the same or different. The thickness of the limiting member 40 can be reasonably set according to the specific size of the first gap 10a required during the expansion of the battery monomer 30.

[0110] Therefore, during the assembly of the battery, by controlling the size of the thickness of the limiting member 40, the size of the first gap 10a between the battery monomers 30 can be controlled, so that during the assembly of the battery device 10, the size of the first gap 10a does not need to be deliberately controlled, which is beneficial to simplify the assembly process of the battery device 10 and reduce the process difficulty of the assembly of the battery device 10. And during the assembly of the limiting member 40, only the limiting member 40 needs to be sleeved on the battery monomer 30 or wound on the battery monomer 30, which is simple in process and easy to operate.

[0111] During the cyclic work of the battery monomer 30, with the cyclic absorption and release of the electrolyte by the electrode tab, the electrode assembly 32 cyclically expands and shrinks, and the first gap 10a can reserve space for the expansion of the electrode assembly 32, so that the electrode assembly 32 can freely expand during the cyclic work, reducing the risk of damage to the electrode tab due to blocked expansion of the electrode assembly 32.

[0112] The battery device 10 provided by the embodiment of the application comprises a limiting member 40, and the limiting member 40 is arranged around the shell 31 of at least one battery monomer 30, so that the limiting member 40 makes the adjacent two battery monomers 30 have a first gap 10a, so as to reserve space for the expansion of the battery monomer 30, and is beneficial to simplify the overall structure of the battery device 10, reduce the number of parts of the battery device 10 as a whole, and is beneficial to simplify the assembly process of the battery device 10 and improve the assembly efficiency of the battery device 10.

[0113] In some embodiments, as shown in Figure 2 The plurality of battery monomers 30 are arranged at least along a second direction Y, the second direction Y is perpendicular to the first direction X, and one of any two battery monomers 30 adjacent along the second direction Y is provided with a limiting member 40.

[0114] The plurality of battery cells 30 can be arranged only along the second direction Y, or the plurality of battery cells 30 can also be arranged along a direction perpendicular to the first direction X and the second direction Y. One of any two battery cells 30 adjacent along the second direction Y is provided with the limiting piece 40, so that among any two battery cells 30 adjacent along the second direction Y, only one battery cell 30 is provided with the limiting piece 40, in other words, along the second direction Y, the battery cell 30 provided with the limiting piece 40 and the battery cell 30 not provided with the limiting piece 40 are arranged alternately.

[0115] In this way, on the premise that the first gap 10a is formed between any two battery cells 30 adjacent along the second direction Y, the number of limiting pieces 40 can be maximized, and on the premise that sufficient expansion space is provided for the battery cells 30, the overall structure of the battery device 10 is simplified and the assembly efficiency of the battery device 10 is improved.

[0116] In some embodiments, as shown in Figure 6 , Figure 9 and Figure 10 , the plurality of battery cells 30 are arranged in an array along the second direction Y and the third direction Z, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, and one of any two battery cells 30 adjacent along the third direction Z is provided with the limiting piece 40.

[0117] The plurality of battery cells 30 are arranged in an array along the second direction Y and the third direction Z, and only one of any two battery cells 30 adjacent along the third direction Z is provided with the limiting piece 40, in other words, along the third direction Z, the battery cell 30 provided with the limiting piece 40 and the battery cell 30 not provided with the limiting piece 40 are arranged alternately.

[0118] In this way, on the premise that the first gap 10a is formed between any two battery cells 30 adjacent along the second direction Y and the third direction Z, the number of limiting pieces 40 can be maximized, and to a greater extent, the overall structure of the battery device 10 is simplified, and on the premise that sufficient expansion space is provided for the battery cells 30, the overall structure of the battery device 10 is further simplified and the assembly efficiency of the battery device 10 is further improved.

[0119] In some embodiments, as shown in Figure 7 and Figure 8 , at least one limiting piece 40 is an elastic piece, the elastic piece is annular, and the elastic piece is sleeved on the shell 31 along the first direction X.

[0120] The battery device 10 can include one or more limiters 40. In embodiments in which the battery device 10 includes multiple limiters 40, the multiple limiters 40 can all be elastic members, or a portion of the multiple limiters 40 can be elastic members. The material of the elastic member includes rubber or polypropylene, and the like, and only needs to have a certain elasticity.

[0121] When the elastic member is annular, the elastic member is integrally formed and annular. During assembly, the elastic member is only needed to be sleeved on the shell 31 of the battery monomer 30, and the elastic force of the elastic member is used to stably connect the limiter 40 to the shell 31 of the battery monomer 30, without the need to use adhesion or the like to connect the elastic member and the shell 31.

[0122] By setting at least one limiter 40 as an elastic member, the connection between the elastic member and the shell 31 is facilitated, the assembly of the elastic member is facilitated, and the assembly process of the battery device 10 is further facilitated, and the assembly efficiency of the battery device 10 is improved.

[0123] In some embodiments, as shown in FIG. 1, at least one battery monomer 30 is provided with at least two limiters 40, and the at least two limiters 40 are spaced apart along the first direction X. Figure 7

[0124] Optionally, one battery monomer 30 can be provided with two, three or more limiters 40. For example, one limiter 40 can be arranged at each end of one battery monomer 30 along the first direction X.

[0125] When the multiple limiters 40 are spaced apart along the first direction X, the two limiters 40 adjacent along the first direction X can provide a certain sealing effect at both ends of the first gap 10a along the first direction X, and reduce the risk that foreign matter such as dust from the outside enters the first gap 10a along the end of the shell 31 along the first direction X and adversely affects the battery monomer 30.

[0126] For example, during assembly of the battery monomer 30, the shell 31 of the battery monomer 30 can be adhesively connected to the box body 11 away from one end of the electrode terminal 33 along the first direction X. By providing the limiter 40, the risk that the adhesive flows into the first gap 10a and affects the normal cyclic expansion of the battery monomer 30 can be reduced.

[0127] Optionally, along a direction perpendicular to the first direction X, the limiters 40 and the electrode body 321 can all overlap, partially overlap or not overlap at all, which can be selected as needed.

[0128] ​In some embodiments, the battery cell 30 includes an electrode assembly 32 accommodated in the shell 31, the electrode assembly 32 includes an electrode body 321 and a tab 322 led out from an end of the electrode body 321 along the first direction X, the electrode body 321 is arranged in a position offset from a projection of the shell 31 along a direction perpendicular to the first direction X.

[0129] In other words, the projection of the electrode body 321 along the first direction X in the shell 31 and the projection of the limiting member 40 along the first direction X in the shell 31 are completely non-overlapping. Since the electrode body 321 mainly generates cyclic expansion and contraction of the tab during the cyclic operation of the battery cell 30, it is beneficial to reduce the binding force of the limiting member 40 on the tab and affect the normal expansion of the battery cell 30, thereby reducing the risk of damage to the tab of the electrode body 321.

[0130] In some embodiments, as shown in Figure 7 The battery cell 30 includes an electrode assembly 32 accommodated in the shell 31, the electrode assembly 32 includes an electrode body 321 and a tab 322 led out from an end of the electrode body 321 along the first direction X. Along the first direction X, the limiting member 40 and the farthest distance d of the closest end of the shell 31 along the first direction X satisfy: 10mm≤d≤15mm.

[0131] Optionally, d can be 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, etc.

[0132] The farthest distance d of the limiting member 40 and the closest end of the shell 31 along the first direction X can be the maximum distance of the end region of the shell 31 along the first direction X occupied by the limiting member 40. Generally, the end of the electrode body 321 along the first direction X needs to be provided with a tab 322 or a support structure, etc., so that the end of the electrode body 321 along the first direction X has a certain distance from the adjacent end of the shell 31 along the first direction X, and the distance is usually about 20mm.

[0133] In this way, by setting 10mm≤d≤15mm, even if the projection of the limiting member 40 along the first direction X in the shell 31 and the projection of the electrode body 321 along the first direction X in the shell 31 are as little overlapping as possible, to reduce the risk of the limiting member 40 binding the electrode body 321, it is beneficial to reduce the risk of damage to the tab during the cyclic expansion of the battery cell 30.

[0134] In some embodiments, as shown in Figure 8As shown, the limiting member 40 includes a first part 41 and a second part 42, the first part 41 is arranged at the side of the battery monomer 30 along the second direction Y, and the second part 42 is arranged at the side of the battery monomer 30 along the third direction Z, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, and the size of the first part 41 along the second direction Y is greater than the size of the second part 42 along the third direction Z.

[0135] The size of the first gap 10a required by the battery monomer 30 at different sides is different, by setting the size of the first part 41 to be greater than the size of the second part 42, that is, setting different sides of the battery monomer 30 to have different sizes of the first gap 10a, so as to more flexibly and reasonably set the thickness of the first part 41 and the second part 42 of the limiting member 40 according to the size of the required first gap 10a, so as to improve the energy density of the battery device 10 under the premise of meeting the expansion needs of the battery monomer 30.

[0136] Optionally, the size of the shell 31 along the first direction X can be greater than the size along the second direction Y, or the size of the shell 31 along the second direction Y can be greater than the size along the first direction X.

[0137] In some embodiments, the size of the shell 31 along the third direction Z is greater than the size of the shell 31 along the second direction Y.

[0138] The size of the shell 31 along the third direction Z is greater than the size along the second direction Y, so that the battery monomer 30 mainly expands along the second direction Y during the cyclic operation, and therefore, the side of the battery monomer 30 along the second direction Y needs to have a larger space.

[0139] And by setting the size of the first part 41 along the second direction Y to be greater than the size of the second part 42 along the third direction Z, the side of the battery monomer 30 along the second direction Y has a larger first gap 10a, so as to meet the expansion needs of the electrode assembly 32, and further facilitate reducing the risk of damage of the electrode assembly 32 due to expansion obstruction during the cyclic operation.

[0140] In some embodiments, the melting point T of the limiting member 40 satisfies: T≥60℃.

[0141] During assembly, the limiting member 40 can provide a certain limiting effect for the battery monomer 30, so that the adjacent battery monomers 30 have a suitable first gap 10a. After the assembly of the battery monomer 30 is completed, the limiting member 40 is clamped between the adjacent two battery monomers 30, which can reduce the risk that external impurities enter between the battery monomers 30 through the end along the first direction X and affect the cyclic performance of the battery monomer 30.

[0142] And the battery cell 30 will usually generate a certain amount of heat in the process of working. Therefore, the limiting piece 40 needs to have a certain high-temperature resistance to maintain the stability of the structure of the limiting piece 40, and the maximum temperature of the normal working of the battery cell 30 is usually around 60°C.

[0143] By setting the melting point T of the limiting piece 40 ≥ 60℃, in the process of the cyclic working of the battery cell 30, it is conducive to improving the structural stability of the limiting piece 40, and reducing the risk of the impurities entering the first gap 10a along the first direction X through the battery cell 30.

[0144] In some embodiments, the limiting piece 40 is adhesively connected with the shell 31.

[0145] By setting the limiting piece 40 to be adhesively connected with the shell 31, it is conducive to improving the connection stability of the limiting piece 40 and the shell 31, and reducing the risk of the limiting piece 40 falling off from the shell 31.

[0146] In some embodiments, the limiting piece 40 is located inside the shell 31 along the orthographic projection of the limiting piece 40 perpendicular to the first direction X.

[0147] In this way, along the first direction X, the limiting piece 40 does not exceed the end of the shell 31 along the first direction X, which is conducive to reducing the risk of interference between the limiting piece 40 and other structures inside the battery device 10, and reducing the risk of the limiting piece 40 being scratched and falling off from the shell 31.

[0148] In the second aspect, the embodiments of the present application provide a power utilization device, which comprises the battery device 10 provided by any of the above-mentioned embodiments, and the battery device 10 is used to provide electric energy.

[0149] The power utilization device provided by the embodiments of the present application has the same technical effects as the battery device 10 provided by the embodiments of the present application, and thus the details are not repeated here.

[0150] In some embodiments, as Figures 2 to 10As shown, the battery device 10 comprises a box body 11, a plurality of battery monomers 30 accommodated in the box body 11, and a limiting member 40. The battery monomer 30 comprises a shell 31 and an electrode terminal 33 arranged at a side of the shell 31 along a first direction X. The limiting member 40 is arranged around at least one shell 31 of the battery monomer 30 along the first direction X, and at least part of the limiting member 40 is clamped between two adjacent battery monomers 30 to form a first gap 10a between the two adjacent battery monomers 30. The plurality of battery monomers 30 are arranged along a second direction Y and a third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. The limiting member 40 is arranged on one of any two adjacent battery monomers 30 along the second direction Y, and the limiting member 40 is arranged on one of any two adjacent battery monomers 30 along the third direction Z. The at least one limiting member 40 is an elastic member, which is annular and sleeved on the shell 31 along the first direction X. The at least one battery monomer 30 is provided with at least two limiting members 40, and the at least two limiting members 40 are arranged at intervals along the first direction X. The battery monomer 30 comprises an electrode assembly 32 accommodated in the shell 31, and the electrode assembly 32 comprises an electrode body 321 and a tab 322 led out from an end of the electrode body 321 along the first direction X. The electrode body 321 is arranged in a position offset from the limiting member 40 in the shell 31 along a direction perpendicular to the first direction X. Along the first direction X, the limiting member 40 and the farthest end of the shell 31 along the first direction X have a distance d satisfying 10mm≤d≤15mm. The limiting member 40 comprises a first part 41 arranged at a side of the battery monomer 30 along the second direction Y and a second part 42 arranged at a side of the battery monomer 30 along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other, and the size of the first part 41 along the second direction Y is greater than the size of the second part 42 along the third direction Z. The size of the shell 31 along the third direction Z is greater than the size of the shell 31 along the second direction Y. The melting point T of the limiting member 40 satisfies T≥60℃. The limiting member 40 is arranged in a position inside the shell 31 along a direction perpendicular to the first direction X.

[0151] The battery device 10 provided by the embodiment of the present application comprises the limiting member 40, and the limiting member 40 is arranged around at least one shell 31 of the battery monomer 30 to form the first gap 10a between the two adjacent battery monomers 30 by the limiting member 40, so as to reserve space for the expansion of the battery monomer 30, and facilitate the simplification of the overall structure of the battery device 10, the reduction of the number of parts of the battery device 10, the simplification of the assembly process of the battery device 10 and the improvement of the assembly efficiency of the battery device 10.

[0152] Although the present application has been described with reference to preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Box; Multiple battery cells are housed within the housing. Each battery cell includes a housing and electrode terminals, with the electrode terminals located on the side of the housing along a first direction. A limiting member is disposed around at least one circumference of the housing of at least one of the battery cells in the first direction, and at least a portion of the limiting member is clamped between two adjacent battery cells to create a first gap between the at least two adjacent battery cells.

2. The battery device according to claim 1, characterized in that, The plurality of battery cells are arranged at least along a second direction, which is perpendicular to the first direction, and one of any two adjacent battery cells along the second direction is provided with the limiting member.

3. The battery device according to claim 2, characterized in that, Multiple battery cells are arranged in an array along the second direction and the third direction, with the first direction, the second direction and the third direction being perpendicular to each other, and the limiting member is provided on one of any two adjacent battery cells along the third direction.

4. The battery device according to claim 1, characterized in that, At least one of the limiting members is an elastic member, which is annular and sleeved around the outer shell in the first direction.

5. The battery device according to claim 1, characterized in that, At least one of the battery cells is provided with at least two of the limiting members, and the at least two limiting members are spaced apart along the first direction.

6. The battery device according to claim 1, characterized in that, The battery cell includes an electrode assembly housed within the housing. The electrode assembly includes an electrode body and a tab. The tab extends from the end of the electrode body along the first direction. In a direction perpendicular to the first direction, the orthographic projection of the electrode body onto the housing is offset from the orthographic projection of the limiting member onto the housing.

7. The battery device according to claim 1, characterized in that, The battery cell includes an electrode assembly housed within the housing. The electrode assembly includes an electrode body and a tab, with the tab extending from the end of the electrode body along the first direction. Along the first direction, the farthest distance d between the limiting member and the nearest end of the outer shell along the first direction satisfies: 10mm≤d≤15mm.

8. The battery device according to claim 1, characterized in that, The limiting member includes a first part and a second part. The first part is disposed on the side of the battery cell along the second direction, and the second part is disposed on the side of the battery cell along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The dimension of the first part along the second direction is larger than the dimension of the second part along the third direction.

9. The battery device according to claim 8, characterized in that, The dimension of the housing along the third direction is greater than the dimension of the housing along the second direction.

10. The battery device according to claim 1, characterized in that, The melting point T of the limiting component satisfies: T≥60℃.

11. The battery device according to claim 1, characterized in that, The limiting member is bonded to the outer shell.

12. The battery device according to claim 1, characterized in that, The limiting member, when projected perpendicularly to the first direction onto the housing, is located inside the housing.

13. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 12, the battery device being used to provide electrical energy.

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