Battery monomer, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, electrolyte and a liquid absorption part, the electrode assembly is contained in the shell, the electrolyte is contained in the shell, and the liquid absorption piece is arranged between the shell and at least part of the surface of the electrode assembly and used for absorbing the electrolyte. The number of the liquid absorption pieces is multiple, and the multiple liquid absorption pieces are arranged at intervals. According to the technical scheme, the reliability of the battery device can be improved.

Description

TECHNICAL FIELD

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

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the development of battery device technology, how to improve the reliability of the battery device is a technical problem that needs to be solved in the battery device technology. Utility model content

[0004] The application provides a battery monomer, a battery device and a power utilization device, which can improve the reliability of the battery device.

[0005] The application is achieved through the following technical solutions:

[0006] In a first aspect, the application provides a battery monomer, which includes a shell, an electrode assembly, an electrolyte and a liquid absorbing piece. The electrode assembly is contained in the shell, the electrolyte is contained in the shell, and the liquid absorbing piece is arranged between the shell and at least part of the surface of the electrode assembly and is used to absorb the electrolyte. The number of the liquid absorbing pieces is multiple, and the multiple liquid absorbing pieces are arranged at intervals.

[0007] The technical solution of the application embodiment sets the liquid absorbing piece between the shell and the electrode assembly, the liquid absorbing piece can store the electrolyte outside the electrode assembly; during the charging and discharging cycle of the battery monomer, the electrolyte is gradually consumed, when the electrode assembly expands, the electrode assembly can extrude the liquid absorbing piece to extrude the electrolyte in the liquid absorbing piece for the electrode assembly to use, so that the utilization rate of the electrolyte in the shell is high, and because the liquid absorbing piece is arranged between the electrode assembly and the shell, the liquid absorbing piece can limit the expansion and deformation of the electrode assembly, reduce the risk of metal ion precipitation in the electrode assembly, and help to improve the reliability of the battery monomer. In addition, the multiple liquid absorbing pieces are arranged at intervals, so that the liquid absorbing pieces do not need to be arranged between the surfaces of the shell and the electrode assembly, the required material of the liquid absorbing piece is less, and the cost is saved.

[0008] In some embodiments, the shell includes two first walls arranged opposite along a first direction, and the liquid absorbing piece is arranged between the electrode assembly and at least one first wall. The surface of the battery monomer perpendicular to the first direction is the surface with the largest area of the battery monomer.

[0009] The technical scheme of the embodiment of the application is that the two first walls are oppositely arranged along the first direction, and the surface of the battery monomer perpendicular to the first direction is the surface with the largest area of the battery monomer, that is, the first wall is the large surface of the shell. Generally, the surface of the electrode assembly corresponding to the large surface of the shell expands to a large extent, and by arranging the liquid absorbing member between the large surface and the electrode assembly, the electrolyte in the liquid absorbing member can be further squeezed out for use by the electrode assembly, so that the utilization rate of the electrolyte in the shell is high, and the liquid absorbing member can limit the expansion and deformation of the surface of the electrode assembly corresponding to the large surface of the shell, reduce the risk of metal ion precipitation in the electrode assembly, and help to improve the reliability of the battery monomer.

[0010] In some embodiments, the shell includes a second wall, the second wall connects the two first walls, and the second wall is located at one end of the first wall in the second direction. The battery monomer further includes an electrode terminal, the electrode terminal is arranged on the second wall, and the electrode terminal is connected with the tab of the electrode assembly. The plurality of liquid absorbing members are arranged at intervals along the second direction, and the second direction is perpendicular to the first direction.

[0011] The technical scheme of the embodiment of the application is that the electrode terminal is arranged on the second wall and connected with the tab, so as to facilitate the export or import of electric energy to the electrode assembly, and help to improve the convenience of the battery monomer for providing electric energy to the electric device. By arranging the plurality of liquid absorbing members at intervals along the second direction, the liquid absorbing members do not need to cover the surface between the shell and the electrode assembly in the first direction, so that the material required by the liquid absorbing member is less, and the cost is saved.

[0012] In some embodiments, in the second direction, the size of the liquid absorbing member is L1, and the condition is 5mm≤L1≤30mm.

[0013] The technical scheme of the embodiment of the application is that in the second direction, the size of the liquid absorbing member satisfies the above condition, when L1≥5mm, the size of the liquid absorbing member is large, which can make the utilization rate of the electrolyte in the shell high, can better limit the expansion and deformation of the electrode assembly, has good support for the electrode assembly, and helps to improve the reliability of the battery monomer; at the same time, when L1≤30mm, the size of the liquid absorbing member is small, so that the material required by the liquid absorbing member is less, and the cost is saved.

[0014] In some embodiments, 10mm≤L1≤20mm.

[0015] The technical scheme of the embodiment of the application is that in the second direction, the size of the liquid absorbing member satisfies the above condition, which can further improve the utilization rate of the electrolyte in the shell, and better limit the expansion and deformation of the electrode assembly, and at the same time, further save the cost.

[0016] In some embodiments, in the second direction, the distance between the two adjacent liquid absorbing members is D1, and the size of the electrode assembly is L2, and the condition is 0.01≤D1 / L2≤0.1.

[0017] The technical scheme of the embodiment of the application meets the above condition in the second direction, when D1 / L2 is greater than or equal to 0.01, the distance between the two adjacent liquid absorbing members is large, so that the proportion of the outer surface of the electrode assembly corresponding to the liquid absorbing member is large, thereby enabling the liquid absorbing member to require less material and saving cost; meanwhile, when D1 / L2 is less than or equal to 0.1, the proportion of the outer surface of the electrode assembly corresponding to the liquid absorbing member is large, so that the utilization rate of the electrolyte in the shell is high, the expansion and deformation of the electrode assembly are better limited, and the reliability of the battery monomer is improved.

[0018] In some embodiments, 0.03≤D1 / L2≤0.07.

[0019] The technical scheme of the embodiment of the application meets the above condition in the second direction, the distance between the two adjacent liquid absorbing members is further small, the liquid absorbing member requires less material and saves cost, the utilization rate of the electrolyte in the shell is high, the expansion and deformation of the electrode assembly are better limited, and the reliability of the battery monomer is further improved.

[0020] In some embodiments, the shell includes a second wall, the second wall connects the two first walls, and the second wall is located at one end of the first wall in the second direction. The battery monomer further includes an electrode terminal, the electrode terminal is arranged on the second wall, and the electrode terminal is connected with the tab of the electrode assembly. The plurality of liquid absorbing members are arranged at intervals along a third direction, and the third direction, the first direction and the second direction are perpendicular to each other.

[0021] The technical scheme of the embodiment of the application, by arranging the plurality of liquid absorbing members at intervals along the third direction, enables the liquid absorbing members not to be arranged between the surface of the shell and the electrode assembly in the first direction, so that the liquid absorbing members require less material and save cost.

[0022] In some embodiments, in the third direction, the size of the liquid absorbing member is L3, and the size of the electrode assembly is L4, and the condition 0.08≤L3 / L4≤0.2 is met.

[0023] The technical scheme of the embodiment of the application meets the above condition in the third direction, when L3 / L4 is greater than or equal to 0.08, the size of the liquid absorbing member is large, so that the utilization rate of the electrolyte in the shell is high, the liquid absorbing member can better limit the expansion and deformation of the electrode assembly, and the reliability of the battery monomer is improved; meanwhile, when L3 / L4 is less than or equal to 0.2, the size of the liquid absorbing member is small, so that the liquid absorbing member requires less material and saves cost.

[0024] In some embodiments, 0.1≤L3 / L4≤0.15.

[0025] The technical solution of the embodiment of the present application can further improve the utilization rate of the electrolyte in the shell and the wicking member can better limit the expansion deformation of the electrode assembly in the third direction, and further save costs.

[0026] In some embodiments, in the third direction, the distance between the two adjacent wicking members is D2, and the size of the electrode assembly is L4, and the condition is satisfied: 0.01≤D2 / L4≤0.1.

[0027] The technical solution of the embodiment of the present application can further improve the utilization rate of the electrolyte in the shell and the wicking member can better limit the expansion deformation of the electrode assembly in the third direction, and further save costs.

[0028] In some embodiments, 0.03≤D2 / L4≤0.07.

[0029] The technical solution of the embodiment of the present application can further improve the utilization rate of the electrolyte in the shell and the wicking member can better limit the expansion deformation of the electrode assembly in the third direction, and further save costs.

[0030] In some embodiments, in the first direction, the thickness of the wicking member is L5, and the condition is satisfied: 50μm≤L5≤500μm.

[0031] The technical solution of the embodiment of the present application can further improve the utilization rate of the electrolyte in the shell and the wicking member can better limit the expansion deformation of the electrode assembly in the third direction, and further save costs.

[0032] In some embodiments, 100μm≤L5≤300μm.

[0033] The technical solution of the embodiment of the present application can further make the utilization rate of the electrolyte in the shell high, and the wicking member can better limit the swelling deformation of the electrode assembly, thereby improving the reliability of the battery monomer.

[0034] In some embodiments, the electrode assembly includes a main body region and two thinning regions, the two thinning regions are respectively arranged at two ends of the main body region in the second direction, and the size of the electrode tab of the electrode assembly in the main body region is greater than the size of the electrode tab of the electrode assembly in the thinning region in the first direction. A part of the plurality of wicking members is arranged in the thinning region, and another part of the plurality of wicking members is arranged in the main body region.

[0035] The technical solution of the embodiment of the present application can further make the utilization rate of the electrolyte in the shell high, and the wicking member can better limit the swelling deformation of the electrode assembly, thereby improving the reliability of the battery monomer.

[0036] In some embodiments, the wicking member includes a polystyrene film layer.

[0037] The polystyrene film layer has good water absorption, and can swell after absorbing water and can seep out the absorbed liquid after being extruded. By setting the wicking member as a polystyrene film layer, the electrolyte can be absorbed; at the same time, when the electrode assembly swells, the electrode assembly can extrude the wicking member to extrude the electrolyte in the wicking member for the electrode assembly to use, thereby making the utilization rate of the electrolyte in the shell high, improving the reliability of the battery monomer, and the wicking member can better limit the swelling deformation of the electrode assembly, thereby reducing the risk of metal ion precipitation of the electrode assembly, thereby improving the reliability of the battery device.

[0038] In some embodiments, the wicking member has a wicking capacity of 0.001 g / cm 3 ~ 0.02 g / cm 3 .

[0039] The technical solution of the embodiment of the present application can further make the utilization rate of the electrolyte in the shell high, and the wicking member can better limit the swelling deformation of the electrode assembly, thereby improving the reliability of the battery monomer.

[0040] In a second aspect, the embodiment of the present application also provides a battery device including the battery monomer of any one of the embodiments of the first aspect.

[0041] In a third aspect, the embodiments of the present application further provide a power consuming device, comprising the battery cell according to any one of the embodiments of the first aspect or the battery device according to any one of the embodiments of the second aspect, and the battery cell or the battery device is configured to provide electric energy.

[0042] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0043] 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 of the embodiments of the present application, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0044] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0045] Figure 2 The structural exploded schematic diagram of a battery is provided for some embodiments of the present application;

[0046] Figure 3 The structural exploded schematic diagram of a battery cell is provided for some embodiments of the present application;

[0047] Figure 4 The internal structural schematic diagram of a battery cell is provided for some embodiments of the present application;

[0048] Figure 5 The internal structural schematic diagram of a battery cell is provided for some embodiments of the present application;

[0049] Figure 6 The setting schematic diagram of a liquid absorbing member is provided for some embodiments of the present application;

[0050] Figure 7 The setting schematic diagram of a liquid absorbing member is provided for some embodiments of the present application;

[0051] Figure 8 The schematic diagram of an electrode assembly is provided for some embodiments of the present application;

[0052] Figure 9 The schematic diagram of a thinning area is provided for some embodiments of the present application.

[0053] Icon: 1 - battery cell; 10 - housing; 11 - first wall; 12 - second wall; 14 - electrode terminal; 15 - shell; 16 - end cover; 17 - bottom wall; 18 - first side wall; 19 - second side wall; 20 - electrode assembly; 21 - tab; 22 - main body area; 23 - thinned area; 24 - positive electrode sheet; 25 - negative electrode sheet; 26 - separator; 30 - liquid absorbing member; 100 - battery device; 110 - box body; 120 - first sub-box body; 130 - second sub-box body; 1000 - vehicle; 1100 - controller; 1200 - motor; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0054] In order to make the objects, 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 only some of the embodiments of the present application, rather than all 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 effort should fall within the scope of the present application.

[0055] 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 the 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, rather than to describe a particular order or primary and secondary relationship.

[0056] In the present application, the phrase "embodiment" means that the specific features, structures or properties described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0057] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" 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 an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0058] The term "and / or", as used herein, merely describes association between associated objects, and can exist in three forms: for example, A and / or B can mean: A alone, both A and B, or B alone. In addition, the character " / " as used herein generally represents an "or" relationship between the front and rear associated objects.

[0059] "Multiple" appearing in the present application refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0060] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0061] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module 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.

[0062] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0063] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0064] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0065] As an example, the box can include a first sub-box and a second sub-box. The first sub-box and the second sub-box are coupled so that a closed space is formed inside the box to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first sub-box can be a top cover or a bottom plate.

[0066] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0067] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can become at least part of the floor of the vehicle, or the frame of the box can become at least part of the cross beams and longitudinal beams of the vehicle.

[0068] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of the box is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] In some embodiments, the positive electrode can be a positive electrode tab, which can include a positive electrode current collector and a positive electrode active material layer arranged on at least one surface of the positive electrode current collector.

[0073] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material layer is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0074] As an example, the positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating treatment on the surface, stainless steel with silver plating treatment on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. 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.).

[0075] As an example, the positive electrode active material layer can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material layer of the battery can also be used.

[0076] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0077] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active layer is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0078] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, or the like can be employed.

[0079] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material layer is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0080] As an example, the negative electrode active material layer can employ a material known in the art. As an example, the negative electrode active material layer 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 battery negative electrode active material layer can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0081] In some embodiments, the separator is a separator membrane. The present application does not have a particular limitation on the type of separator membrane, and any known porous structure separator membrane having good chemical stability and mechanical stability can be used.

[0082] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator membrane can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator membrane is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0083] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0084] 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.

[0085] The technical solutions described in the embodiments of the present application are applicable to various power consumption devices using battery monomers and battery devices, for example, mobile phones, portable devices, notebook computers, electric bicycles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft including airplanes, rockets, space shuttles and spaceships.

[0086] At present, from the development of market situation, the battery has been widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as electric tools, unmanned aerial vehicles, energy storage equipment and other fields. With the continuous expansion of the field of battery, the demand of its market is also increasing.

[0087] The development of battery technology should consider many design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, with the change of environmental conditions and / or internal conditions of the battery, the reliability of the battery device is also one of the key factors to be considered.

[0088] At present, the electrode assembly and the electrolyte are contained in the shell to form the battery monomer. The electrolyte serves as the carrier for the transfer of metal ions between the positive and negative electrode sheets of the electrode assembly, realizing the charge-discharge process of the electrode assembly. Generally, the electrode assembly is soaked in the electrolyte, and the electrode assembly will absorb part of the electrolyte. The electrolyte (i.e. free electrolyte) not absorbed by the electrode assembly is located between the electrode assembly and the shell.

[0089] At the same time, during the charge-discharge cycle of the battery monomer, the electrode assembly will swell, and the part of the electrode assembly that needs to be absorbed will increase, which will cause the risk of insufficient electrolyte and affect the charge-discharge of the electrode assembly. Moreover, when the electrode assembly swells, the gap between the positive and negative electrode sheets increases. Taking a lithium ion battery as an example, the distance of lithium ion transmission between the positive and negative electrode sheets increases, which leads to lithium precipitation of the electrode assembly, thereby affecting the reliability of the battery monomer and the reliability of the battery device.

[0090] Based on the above considerations, in order to reduce the risk of insufficient electrolyte and electrode assembly precipitation of metal ions affecting the reliability of the battery device, the embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly, an electrolyte and a liquid absorbing member. The electrode assembly is contained in the shell, the electrolyte is contained in the shell, and the liquid absorbing member is arranged between the shell and at least part of the surface of the electrode assembly. The liquid absorbing member is used to absorb the electrolyte. The number of the liquid absorbing member is multiple, and the multiple liquid absorbing members are arranged at intervals.

[0091] By arranging the liquid absorbing member between the shell and the electrode assembly, the liquid absorbing member can store electrolyte outside the electrode assembly; during the charging and discharging cycle of the battery monomer, the electrolyte is gradually consumed, and when the electrode assembly expands, the electrode assembly can extrude the liquid absorbing member to extrude the electrolyte in the liquid absorbing member for the electrode assembly to use, thereby making the utilization rate of the electrolyte in the shell higher, and since the liquid absorbing member is arranged between the electrode assembly and the shell, the liquid absorbing member can limit the expansion and deformation of the electrode assembly, reduce the risk of metal ion precipitation in the electrode assembly, and help improve the reliability of the battery monomer. In addition, the plurality of liquid absorbing members are arranged at intervals, and the liquid absorbing member does not need to be arranged between the surface of the shell and the electrode assembly, so that the liquid absorbing member requires less material and saves cost.

[0092] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft, and can also be used to form a power supply system of the electric device.

[0093] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0094] Please refer to Figure 1 , Figure 1 The structure of the vehicle provided in some embodiments of the present application is shown in the schematic diagram. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, which is used for the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0095] The vehicle 1000 can also include a controller 1100 and a motor 1200, and the controller 1100 is used to control the battery device 100 to supply power to the motor 1200, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0096] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0097] Please refer to Figure 2 , Figure 2A structural exploded view of a battery is provided for some embodiments of the present application. The battery device 100 can further include a box 110 in which the battery cell 1 is accommodated. The box 110 is configured to provide a space for accommodating the battery cell 1, and can have various structures. In some embodiments, the box 110 can include a first sub-box 120 and a second sub-box 130, the first sub-box 120 and the second sub-box 130 are overlapped with each other, and the first sub-box 120 and the second sub-box 130 together define a space for accommodating the battery cell 1. The second sub-box 130 can be a hollow structure with one end open, and the first sub-box 120 can be a plate structure, which is overlapped with the open end of the second sub-box 130 to define the space together with the second sub-box 130. The first sub-box 120 and the second sub-box 130 can also be hollow structures with one side open, and the open end of the first sub-box 120 is overlapped with the open end of the second sub-box 130.

[0098] In the battery device 100, the battery cell 1 can be multiple, and the multiple battery cells 1 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 1 are connected in series and in parallel. The multiple battery cells 1 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 1 is accommodated in the box 110. Of course, the battery device 100 can also be that the multiple battery cells 1 are connected in series, in parallel, or in a mixed connection to form a battery device 100 module, and then the multiple battery device 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 110. The battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting component for realizing the electrical connection between the multiple battery cells 1.

[0099] The battery cell 1 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0100] Please refer to Figure 3 , Figure 3 A structural exploded view of a battery cell is provided for some embodiments of the present application. As shown in Figure 3 , the battery cell 1 includes a housing 10, an electrode assembly 20, and an electrode terminal 14. The housing 10 includes a case 15 and an end cap 16, the case 15 has an opening, and the end cap 16 closes the opening to isolate the internal environment of the battery cell 1 from the external environment.

[0101] The shell 15 is a component for fitting the end cover 16 to form an internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 20, the electrolyte and other components. The shell 15 and the end cover 16 can be independent components. The shell 15 can be of various shapes and sizes. Specifically, the shape of the shell 15 can be determined according to the specific shape and size of the electrode assembly 20. The material of the shell 15 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0102] The end cover 16 refers to a component that covers the opening of the shell 15 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cover 16 can be adapted to the shape of the shell 15 to fit the shell 15. Alternatively, the end cover 16 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 16 is not easily deformed when subjected to extrusion collision, so that the battery cell 1 can have higher structural strength and reliability can also be improved. The end cover 16 can be provided with functional components such as the electrode terminal 14. The electrode terminal 14 can be used to electrically connect with the electrode assembly 20 for outputting or inputting the electrical energy of the battery cell 1. The material of the end cover 16 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is 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 16, which can be used to isolate the electrical connection components in the shell 15 from the end cover 16 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0103] Please refer to Figure 3 , and refer to Figure 4 and Figure 5 , Figure 4 the internal structure schematic diagram of the battery cell provided by some embodiments of the present application Figure 5 the internal structure schematic diagram of the battery cell provided by some embodiments of the present application, wherein Figure 4 and Figure 5 hide part of the shell. The present application provides a battery cell 1, which comprises a shell 10, an electrode assembly 20, an electrolyte and a liquid absorbing member 30. The electrode assembly 20 is accommodated in the shell 10, the electrolyte is accommodated in the shell 10, and the liquid absorbing member 30 is arranged between the shell 10 and at least part of the surface of the electrode assembly 20, and the liquid absorbing member 30 is used to absorb the electrolyte. Among them, the number of liquid absorbing members 30 is multiple, and the multiple liquid absorbing members 30 are arranged at intervals.

[0104] In some embodiments, the liquid absorbing member 30 can be in a layer shape.

[0105] In some embodiments, the liquid absorbing member 30 can be arranged on the outer surface of the electrode assembly 20, and the arrangement can be that the liquid absorbing member 30 is glued to the outer surface of the electrode assembly 20.

[0106] In some embodiments, the liquid absorbing member 30 can be arranged on the inner surface of the housing 10, which is the surface facing the electrode assembly 20, in a manner that the liquid absorbing member 30 is glued to the inner surface of the housing 10.

[0107] In some embodiments, the liquid absorbing member 30 can also be arranged in a manner that the electrode assembly 20 and the housing 10 are clamped together to achieve fixation.

[0108] In some embodiments, the liquid absorbing member 30 can have good water absorption and can swell after absorbing the electrolyte. When the electrode assembly 20 swells during operation, the swelled electrode assembly 20 can press the liquid absorbing member 30, so that the electrolyte absorbed by the liquid absorbing member 30 is squeezed out.

[0109] In some embodiments, the housing 10 can include a shell 15 and an end cover 16. The shell 15 has an opening, and the end cover 16 closes the opening to isolate the internal environment of the battery monomer 1 from the external environment. The shell 15 includes a bottom wall 17, two first side walls 18, and two second side walls 19. The bottom wall 17 and the end cover 16 are arranged opposite to each other along the second direction Y. The two first side walls 18 are arranged opposite to each other along the first direction X. The two second side walls 19 are arranged opposite to each other along the third direction Z. The first side walls 18 and the second side walls 19 can be arranged around the outer periphery of the bottom wall 17. In the second direction Y, one end of the first side wall 18 and one end of the second side wall 19 are connected to the bottom wall 17, and the other end forms the opening.

[0110] The two ends of the first side wall 18 in the third direction Z are connected to the two second side walls 19, respectively. The two ends of the second side wall 19 in the first direction X are connected to the two first side walls 18, respectively. The surface area of the first side wall 18 is greater than the surface area of the second side wall 19, and is greater than the surface area of the end cover 16 and the surface area of the bottom wall 17.

[0111] The liquid absorbing member 30 can be arranged between one wall of the shell 15 and the electrode assembly 20. For example, the liquid absorbing member 30 can be arranged between one first side wall 18 and the outer surface of the electrode assembly 20, or the liquid absorbing member 30 can be arranged between one second side wall 19 and the outer surface of the electrode assembly 20, or the liquid absorbing member 30 can be arranged between the bottom wall 17 or the end cover 16 and the outer surface of the electrode assembly 20.

[0112] The liquid absorbing member 30 can be arranged between multiple walls and the electrode assembly 20. For example, the liquid absorbing member 30 can be arranged between one first side wall 18 and the outer surface of the electrode assembly 20, and between another first side wall 18 and the outer surface of the electrode assembly 20.

[0113] Or the liquid suction member 30 can be arranged between any multiple walls of the two first side walls 18, the two second side walls 19, the bottom wall 17 and the end cover 16 and the outer surface of the electrode assembly 20.

[0114] In some embodiments, the number of liquid suction members 30 can be multiple, such as two, three, four, etc.

[0115] In some embodiments, the multiple liquid suction members 30 can be arranged in the same direction.

[0116] In some embodiments, part of the multiple liquid suction members 30 can be arranged in one direction, another part can be arranged in another direction, and another part can be arranged in another direction.

[0117] In some embodiments, part of the multiple liquid suction members 30 are arranged on the same wall, and the liquid suction members 30 on the same wall can be arranged in the same direction or in different directions.

[0118] In some embodiments, the multiple liquid suction members 30 can be arranged on different walls, and the arrangement directions of the liquid suction members 30 on different walls can be the same, different, partially the same, partially different, etc.

[0119] The technical scheme of the embodiments of the present application sets the liquid suction member 30 between the shell 10 and the electrode assembly 20, and the liquid suction member 30 can store the electrolyte outside the electrode assembly 20. During the charging and discharging cycle of the battery monomer 1, the electrolyte is gradually consumed, and when the electrode assembly 20 expands, the electrode assembly 20 can extrude the liquid suction member 30 to extrude the electrolyte in the liquid suction member 30 for the electrode assembly 20 to use, so that the utilization rate of the electrolyte in the shell 10 is high. In addition, the liquid suction member 30 is arranged between the electrode assembly 20 and the shell 10, which can limit the expansion and deformation of the electrode assembly 20, reduce the risk of metal ion precipitation in the electrode assembly 20, and improve the reliability of the battery monomer 1. In addition, the multiple liquid suction members 30 are arranged at intervals, so that the liquid suction member 30 does not need to be arranged between the surface of the shell 10 and the electrode assembly 20, which reduces the required material of the liquid suction member 30 and saves costs.

[0120] Please refer to Figures 3 to 5 In some embodiments, the shell 10 includes two first walls 11 arranged opposite in the first direction X, and the liquid suction member 30 is arranged between the electrode assembly 20 and at least one first wall 11. Wherein, the surface of the battery monomer 1 perpendicular to the first direction X is the surface with the largest area of the battery monomer 1.

[0121] In some embodiments, the first direction can be represented by the direction indicated by the letter X in the figure.

[0122] In some embodiments, the first direction X can be a width direction of the battery monomer 1.

[0123] In some embodiments, the surface of the battery monomer 1 perpendicular to the first direction X, i.e. the surface of the first wall 11 facing the electrode assembly 20, has the largest surface area. The first wall 11 can be a large surface of the battery monomer 1.

[0124] In some embodiments, the wicking member 30 can be arranged only between one first wall 11 and the electrode assembly 20.

[0125] In some embodiments, a part of the wicking member 30 can be arranged between one first wall 11 and the electrode assembly 20, and another part of the wicking member 30 can be arranged between another first wall 11 and the electrode assembly 20.

[0126] In some embodiments, the first wall 11 can be the first side wall 18.

[0127] The technical solution of the embodiments of the present application, the two first walls 11 are oppositely arranged along the first direction X, and the surface of the battery monomer 1 perpendicular to the first direction X is the surface with the largest area of the battery monomer 1, i.e. the first wall 11 is a large surface of the shell 10. Generally, the surface of the electrode assembly 20 corresponding to the large surface of the shell 10 has a large degree of expansion, and by arranging the wicking member 30 between the large surface and the electrode assembly 20, the electrolyte in the wicking member 30 can be further squeezed out for use by the electrode assembly 20, so that the utilization rate of the electrolyte in the shell 10 is high, and the wicking member 30 can limit the expansion and deformation of the surface of the electrode assembly 20 corresponding to the large surface of the shell 10, reduce the risk of precipitation of metal ions in the electrode assembly 20, and improve the reliability of the battery monomer 1.

[0128] Please refer to Figures 3 to 5 , and refer to Figure 6 , Figure 6 The setting diagram of the wicking member provided by some embodiments of the present application is shown. In some embodiments, the shell 10 includes a second wall 12, the second wall 12 connects the two first walls 11, and the second wall 12 is located at one end of the first wall 11 in the second direction Y. The battery monomer 1 further includes an electrode terminal 14, the electrode terminal 14 is arranged on the second wall 12, and the electrode terminal 14 is connected with the tab 21 of the electrode assembly 20. A plurality of wicking members 30 are arranged at intervals along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0129] In some embodiments, the second wall 12 can be the end cover 16.

[0130] In some embodiments, the second wall 12 can be oppositely arranged with the bottom wall 17 along the second direction Y.

[0131] In some embodiments, the electrode assembly 20 comprises a tab 21 which can extend from an end of the electrode assembly 20 in the second direction Y. In some embodiments, the tab 21 can extend from an end of the electrode assembly 20 in the second direction Y away from the bottom wall 17.

[0132] The end cap 16 is provided with an electrode terminal 14, and the tab 21 extends from an end of the electrode assembly 20 and is connected to the electrode terminal 14, so as to realize charging and discharging of the battery monomer 1 through the electrode terminal 14.

[0133] In some embodiments, the second direction can be represented by the direction indicated by the letter Y in the figure.

[0134] In some embodiments, the second direction Y can be the height direction of the battery monomer 1.

[0135] In some embodiments, the first direction X can be perpendicular to the second direction Y.

[0136] In some embodiments, the second direction Y can be parallel to the thickness direction of the second wall 12.

[0137] In some embodiments, the bottom wall 17 can support the electrode assembly 20.

[0138] In some embodiments, the plurality of liquid absorbing members 30 can be arranged at intervals in the second direction Y, and the two ends of the liquid absorbing member 30 in the third direction Z can extend to the two ends of the electrode assembly 20 in the third direction Z.

[0139] In some embodiments, the two ends of the liquid absorbing member 30 in the third direction Z can not extend to the ends of the electrode assembly 20 in the third direction Z.

[0140] The liquid absorbing member 30 can be bonded to the electrode assembly 20, in order to make the bonding effect of the liquid absorbing member 30 better, in some embodiments, one surface of the liquid absorbing member 30 can correspond to the large surface of the battery monomer 1, and the two ends of the liquid absorbing member 30 in the third direction Z can exceed the two ends of the electrode assembly 20 in the third direction Z, and the excess part is arranged on the surface adjacent to the surface of the electrode assembly 20.

[0141] The technical scheme of the embodiments of the present application connects the electrode terminal 14 and the tab 21 through the second wall 12, so as to facilitate the export or import of electric energy to the electrode assembly 20, and is beneficial to improve the convenience of the battery monomer 1 for providing electric energy to the electric device. By arranging the plurality of liquid absorbing members 30 at intervals in the second direction Y, the liquid absorbing members 30 do not need to be arranged between the surface of the outer shell 10 and the surface of the electrode assembly 20 in the first direction X, so that the material required by the liquid absorbing member 30 is less, and the cost is saved.

[0142] Please refer to Figure 6In some embodiments, in the second direction Y, the size of the liquid suction member 30 is L1, and the condition 5mm≤L1≤30mm is satisfied.

[0143] In some embodiments, in the second direction Y, the size L1 of the liquid suction member 30 satisfies the condition 5mm≤L1≤30mm. L1 can be any one of 5mm, 10mm, 15mm, 20mm, 25mm, 30mm or a value between any two of them.

[0144] In some embodiments, in the second direction Y, the size of each liquid suction member 30 can be the same, partially the same, or all the same.

[0145] In some embodiments, in the second direction Y, the size of the liquid suction member 30 located in the middle region of the electrode assembly 20 can be set to be larger, because the position of the electrode assembly 20 in the middle region has a larger degree of expansion.

[0146] The technical solution of the embodiments of the present application satisfies the above condition for the size of the liquid suction member 30 in the second direction Y. When L1≥5mm, the size of the liquid suction member 30 is larger, which can make the utilization rate of the electrolyte in the shell 10 higher, can better limit the expansion and deformation of the electrode assembly 20, and is beneficial to improve the reliability of the battery monomer 1. At the same time, when L1≤30mm, the size of the liquid suction member 30 is smaller, so that the required material of the liquid suction member 30 is less, and the cost is saved.

[0147] Please refer to Figure 6 In some embodiments, 10mm≤L1≤20mm.

[0148] In some embodiments, in the second direction Y, the size L1 of the liquid suction member 30 satisfies the condition 10mm≤L1≤20mm. L1 can be any one of 10mm, 12mm, 14mm, 16mm, 18mm, 20mm or a value between any two of them.

[0149] The technical solution of the embodiments of the present application satisfies the above condition for the size of the liquid suction member 30 in the second direction Y, which can further improve the utilization rate of the electrolyte in the shell 10, better limit the expansion and deformation of the electrode assembly 20, and further save the cost.

[0150] Please refer to Figure 6 In some embodiments, in the second direction Y, the distance between two adjacent liquid suction members 30 is D1, and the size of the electrode assembly 20 is L2, which satisfies the condition 0.01≤D1 / L2≤0.1.

[0151] In some embodiments, the size of the electrode assembly 20 in the second direction Y can be L2. It should be noted that L2 does not include the size of the tab 21 in the second direction Y.

[0152] In some embodiments, the electrode assembly 20 can be formed by a winding and hot-pressing machine. After the formation, the winding and hot-pressing machine can measure the size of the electrode assembly 20.

[0153] In some embodiments, the distance D1 between the two adjacent liquid absorbing members 30 in the second direction Y satisfies the condition: 0.01≤D1 / L2≤0.1. D1 / L2 can be any one of 0.01, 0.03, 0.05, 0.07, 0.1 or a value between any two of them.

[0154] In some embodiments, the distance D1 between the two adjacent liquid absorbing members 30 in the second direction Y can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc.

[0155] In some embodiments, the size of the electrode assembly 20 in the second direction Y can be L2. It should be noted that L2 does not include the size of the tab 21 in the second direction Y.

[0156] In some embodiments, the distance D1 between the two adjacent liquid absorbing members 30 in the second direction Y can be the same, partially the same or completely the same.

[0157] In some embodiments, the distance between the two adjacent liquid absorbing members 30 in the middle region of the electrode assembly 20 can be set to be smaller due to the greater expansion of the electrode assembly 20 in the middle region in the second direction Y.

[0158] The technical solution of the embodiments of the present application satisfies the above condition for the distance between the two adjacent liquid absorbing members 30 in the second direction Y. When D1 / L2≥0.01, the distance between the two liquid absorbing members 30 is larger, so that the proportion of the outer surface of the electrode assembly 20 not corresponding to the liquid absorbing member 30 is larger, thereby enabling the liquid absorbing member 30 to require less material and save costs. Meanwhile, when D1 / L2≤0.1, the proportion of the outer surface of the electrode assembly 20 corresponding to the liquid absorbing member 30 is larger, which can make the utilization rate of the electrolyte in the shell 10 higher, better limit the expansion and deformation of the electrode assembly 20, and help to improve the reliability of the battery monomer 1.

[0159] Please refer to Figure 6 In some embodiments, 0.03≤D1 / L2≤0.07.

[0160] In some embodiments, in the second direction Y, the distance D1 between two adjacent liquid absorbing members 30 satisfies the condition: 0.03≤D1 / L2≤0.07. D1 / L2 can be any one of 0.03, 0.04, 0.05, 0.06, 0.07 or a value between any two of them.

[0161] The technical solution of the embodiments of the present application can further reduce the material required by the liquid absorbing member 30, save costs, and make the utilization rate of the electrolyte in the shell 10 higher, better limit the expansion and deformation of the electrode assembly 20, and further improve the reliability of the battery monomer 1, by satisfying the above condition for the distance between two adjacent liquid absorbing members 30 in the second direction Y.

[0162] Please refer to Figures 3 to 6 and refer to 7, Figure 7 The setting diagram of the liquid absorbing member provided by some other embodiments of the present application is shown. In some embodiments, the shell 10 includes a second wall 12 connected to two first walls 11, and the second wall 12 is located at one end of the first wall 11 in the second direction Y. The battery monomer 1 also includes an electrode terminal 14 arranged on the second wall 12, and the electrode terminal 14 is connected to the tab 21 of the electrode assembly 20. A plurality of liquid absorbing members 30 are arranged at intervals along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0163] In some embodiments, the third direction Z can be represented by the direction shown by the letter Z in the figure.

[0164] In some embodiments, the third direction Z can be the length direction of the battery monomer 1.

[0165] In some embodiments, the first direction X, the second direction Y and the third direction Z can be perpendicular to each other.

[0166] In some embodiments, the plurality of liquid absorbing members 30 can be arranged at intervals along the third direction Z, and the two ends of the liquid absorbing member 30 in the second direction Y can extend to the two ends of the electrode assembly 20 in the second direction Y.

[0167] In some embodiments, the two ends of the liquid absorbing member 30 in the second direction Y can not extend to the end of the two ends of the electrode assembly 20 in the second direction Y.

[0168] The liquid absorbing member 30 can be bonded to the electrode assembly 20. In order to make the bonding effect of the liquid absorbing member 30 better, in some embodiments, one surface of the liquid absorbing member 30 can correspond to the large surface of the battery monomer 1, and the two ends of the liquid absorbing member 30 in the second direction Y can exceed the two ends of the electrode assembly 20 in the second direction Y, and the excess part is arranged on the surface adjacent to the surface of the electrode assembly 20, that is, the excess part is arranged on the surface of the electrode assembly 20 corresponding to the second side wall 19.

[0169] The technical solution of the embodiment of the application is that the plurality of liquid suction members 30 are arranged at intervals along the third direction Z, so that the liquid suction members 30 do not need to be arranged on the surface between the shell 10 and the electrode assembly 20 in the first direction X, so that the liquid suction members 30 require less material and cost is saved.

[0170] Please refer to Figure 7 In some embodiments, in the third direction Z, the size of the liquid suction member 30 is L3, and the size of the electrode assembly 20 is L4, and the condition 0.08≤L3 / L4≤0.2 is met.

[0171] In some embodiments, in the third direction Z, the size L3 of the liquid suction member 30 meets the condition 0.08≤L3 / L4≤0.2. L3 / L4 can be any one of 0.08, 0.1, 0.12, 0.14, 0.16, 0.18, 0.2 or a value between any two of them.

[0172] In some embodiments, in the third direction Z, the size of each liquid suction member 30 can be the same, partially the same, or all the same.

[0173] Since the electrode assembly 20 expands greatly in the middle region in the third direction Z, in some embodiments, the size of the liquid suction member 30 located in the middle region of the electrode assembly 20 can be set to be larger.

[0174] In some embodiments, in the third direction Z, the size of the electrode assembly 20 can be the distance between the two end faces of the electrode assembly 20 in the third direction Z.

[0175] In some embodiments, in the third direction Z, the size of the motor assembly can be 290mm, 300mm, 310mm, etc.

[0176] In some embodiments, in the third direction Z, the size of the liquid suction member 30 can be 30mm, 35mm, 40mm, etc.

[0177] The technical solution of the embodiment of the application is that, in the third direction Z, the size of the liquid suction member 30 meets the above condition, when L3 / L4≥0.08, the size of the liquid suction member 30 is larger, which can make the utilization rate of the electrolyte in the shell 10 higher, and the liquid suction member 30 can better limit the expansion and deformation of the electrode assembly 20, which is beneficial to improve the reliability of the battery monomer 1; at the same time, when L3 / L4≤0.2, the size of the liquid suction member 30 is smaller, so that the liquid suction member 30 requires less material and cost is saved.

[0178] Please refer to Figure 7 In some embodiments, 0.1≤L3 / L4≤0.15.

[0179] In some embodiments, in the third direction Z, the size L3 of the liquid suction member 30 satisfies the condition: 0.1≤L3 / L4≤0.15. L3 / L4 can be any one of 0.1, 0.11, 0.12, 0.13, 0.14, 0.15 or a value between any two of them.

[0180] The technical solution of the embodiments of the present application can further improve the utilization rate of electrolyte in the shell 10 in the third direction Z, and the liquid suction member 30 can better limit the expansion deformation of the electrode assembly 20, while further saving costs.

[0181] Please refer to Figure 7 In some embodiments, in the third direction Z, the distance between the two adjacent liquid suction members 30 is D2, and the size of the electrode assembly 20 is L4, which satisfies the condition: 0.01≤D2 / L4≤0.1.

[0182] In some embodiments, in the third direction Z, the distance D2 between the two adjacent liquid suction members 30 satisfies the condition: 0.01≤D2 / L4≤0.1. D2 / L4 can be any one of 0.01, 0.03, 0.05, 0.07, 0.1 or a value between any two of them.

[0183] In some embodiments, in the third direction Z, the distance D2 between the two adjacent liquid suction members 30 can be 3mm, 10mm, 20mm, etc.

[0184] In some embodiments, in the third direction Z, the distance D2 between the two adjacent liquid suction members 30 can be the same, partially the same, or completely the same.

[0185] Since the position of the electrode assembly 20 in the middle region has a larger expansion degree in the third direction Z, in some embodiments, the distance between the two adjacent liquid suction members 30 located in the middle region of the electrode assembly 20 can be set to be smaller.

[0186] The technical solution of the embodiments of the present application can further improve the utilization rate of electrolyte in the shell 10 in the third direction Z, and the liquid suction member 30 can better limit the expansion deformation of the electrode assembly 20, while further saving costs.

[0187] Please refer to Figure 7 In some embodiments, 0.03≤D2 / L4≤0.07.

[0188] In some embodiments, in the third direction Z, the distance D2 between the two adjacent liquid absorbing members 30 satisfies the condition: 0.03≤D2 / L4≤0.07. D2 / L4 can be any one of 0.03, 0.04, 0.05, 0.06, 0.07 or a value between any two of them.

[0189] The technical scheme of the embodiments of the present application can further reduce the material required by the liquid absorbing member 30, save costs, and make the utilization rate of the electrolyte in the shell 10 higher, so that the liquid absorbing member 30 can better limit the expansion and deformation of the electrode assembly 20, and further improve the reliability of the battery monomer 1.

[0190] Please refer to Figure 4 In some embodiments, in the first direction X, the thickness of the liquid absorbing member 30 is L5, which satisfies the condition: 50μm≤L5≤500μm.

[0191] In some embodiments, in the first direction X, the thickness of the liquid absorbing member 30 is L5, which satisfies the condition: 50μm≤L5≤500μm. The thickness L5 of the liquid absorbing member 30 can be any one of 50μm, 100μm, 200μm, 300μm, 400μm, 500μm or a value between any two of them.

[0192] It should be noted that the liquid absorbing member 30 will swell after absorbing the electrolyte, and in the first direction X, the thickness L5 of the liquid absorbing member 30 can be the size of the liquid absorbing member 30 before it is arranged between the electrode assembly 20 and the shell 10.

[0193] The technical scheme of the embodiments of the present application satisfies the above condition in the first direction X. When L5≥50μm, the size of the liquid absorbing member 30 is large, which can make the utilization rate of the electrolyte in the shell 10 higher, and the liquid absorbing member 30 can better limit the expansion and deformation of the electrode assembly 20, which is beneficial to improve the reliability of the battery monomer 1; when L5≤500μm, the size of the liquid absorbing member 30 is small, which can reduce the space occupation of the liquid absorbing member 30 in the first direction X, which is beneficial to improve the space utilization in the box, thereby improving the energy density of the battery device 100.

[0194] Please refer to Figure 4 In some embodiments, 100μm≤L5≤300μm.

[0195] In some embodiments, in the first direction X, the thickness L5 of the liquid absorbing member 30 satisfies the condition: 100 μm ≤ L5 ≤ 300 μm. The thickness L5 of the liquid absorbing member 30 can be any value in 100 μm, 150 μm, 200 μm, 250 μm, 300 μm or any value between any two values.

[0196] The technical solution of the embodiments of the present application can further make the utilization rate of the electrolyte in the shell 10 higher, and the liquid absorbing member 30 can better limit the expansion deformation of the electrode assembly 20, which is beneficial to improving the reliability of the battery monomer 1. At the same time, the technical solution of the embodiments of the present application can further reduce the space occupation of the liquid absorbing member 30 in the first direction X, which is beneficial to improving the space utilization rate in the box, thereby being beneficial to improving the energy density of the battery device 100.

[0197] Please refer to Figures 3 to 7 , and refer to Figure 8 and Figure 9 , Figure 8 the schematic diagram of the electrode assembly provided by some embodiments of the present application, Figure 9 the schematic diagram of the thinned area provided by some embodiments of the present application, wherein Figure 9 In some embodiments, the electrode assembly 20 includes a main body area 22 and two thinned areas 23, and the two thinned areas 23 are respectively arranged at the two ends of the main body area 22 in the second direction Y. In the first direction X, the size of the pole piece of the electrode assembly 20 in the main body area 22 is greater than the size of the pole piece of the electrode assembly 20 in the thinned area 23. A part of the plurality of liquid absorbing members 30 is arranged in the thinned area 23, and another part of the plurality of liquid absorbing members 30 is arranged in the main body area 22.

[0198] In some embodiments, in the second direction Y, the two thinned areas 23 are respectively located at the two ends of the main body area 22, one of the thinned areas 23 is arranged close to the end cover 16, and the other thinned area 23 is arranged close to the bottom wall 17.

[0199] In some embodiments, the thinned area 23 can be an area with a smaller thickness in the electrode assembly 20. That is, in the first direction X, the thickness of the thinned area 23 is smaller than the thickness of the main body area 22.

[0200] In some embodiments, the gap between the positive pole piece 24 and the negative pole piece 25 located in the thinned area 23 can be greater than the gap between the positive pole piece 24 and the negative pole piece 25 located in the main body area 22.

[0201] In some embodiments, the positive electrode tab 24 can include a positive electrode current collector and a positive electrode active material layer disposed on both surfaces of the positive electrode current collector in the thickness direction thereof. The positive electrode active material layer of the positive electrode tab 24 is coated to a small thickness, thereby forming the positive electrode tab 24 of the thinned region 23.

[0202] Alternatively, after the positive electrode active material layer of the positive electrode tab 24 is coated, the positive electrode active material of a portion of the positive electrode tab 24 is thinned, thereby the portion of the positive electrode tab 24 being the thinned region 23 and the remaining portion being the main body region 22.

[0203] In some embodiments, the negative electrode tab 25 can include a negative electrode current collector and a negative electrode active material layer disposed on both surfaces of the negative electrode current collector in the thickness direction thereof. The negative electrode active material layer of the negative electrode tab 25 is coated to a small thickness, thereby forming the negative electrode tab 25 of the thinned region 23.

[0204] Alternatively, after the negative electrode active material layer of the negative electrode tab 25 is coated, the negative electrode active material of a portion of the negative electrode tab 25 is thinned, thereby the portion of the negative electrode tab 25 being the thinned region 23 and the remaining portion being the main body region 22.

[0205] The separator 26 separates the positive electrode active material layer and the negative electrode active material layer.

[0206] In some embodiments, a portion of the liquid-absorbing member 30 is disposed in the thinned region 23, which can improve the constraint on the electrode assembly 20 and improve the tightness of the tab and the separator 26 in the thinned region 23 of the electrode assembly 20, thereby improving the problem of metal ion deposition in the thinned region 23 of the electrode assembly 20.

[0207] In some embodiments, in the first direction X, the thickness of the liquid-absorbing member 30 disposed in the thinned region 23 can be greater than the thickness of the liquid-absorbing member 30 disposed in the main body region 22.

[0208] In some embodiments, in the first direction X, the thickness of the liquid-absorbing member 30 disposed in the thinned region 23 can be less than the thickness of the liquid-absorbing member 30 disposed in the main body region 22.

[0209] In the first direction X, the thickness of the liquid-absorbing member 30 disposed in the thinned region 23 can be equal to the thickness of the liquid-absorbing member 30 disposed in the main body region 22.

[0210] The technical scheme of the embodiment of the application sets a part of the liquid absorbing assembly in the thinned area 23 and sets another part of the liquid absorbing piece 30 in the main body area 22, so that the utilization rate of the electrolyte in the shell 10 is high, which is conducive to improving the reliability of the battery monomer 1, and the liquid absorbing piece 30 can limit the expansion deformation of the main body area 22 and the thinned area 23 of the electrode assembly 20, reduce the risk of metal ion precipitation in the main body area 22 and the thinned area 23, and thus improve the reliability of the battery device 100.

[0211] In some embodiments, the liquid absorbing piece 30 includes a polystyrene film layer.

[0212] In some embodiments, the material of the liquid absorbing piece 30 can be foamed material.

[0213] The technical scheme of the embodiment of the application, the polystyrene film layer has good water absorption, and the polystyrene film layer can expand after absorbing water and can seep out the absorbed liquid after being extruded. By setting the liquid absorbing piece 30 as a polystyrene film layer, the electrolyte can be absorbed; at the same time, when the electrode assembly 20 expands, the electrode assembly 20 can extrude the liquid absorbing piece 30 to extrude the electrolyte in the liquid absorbing piece 30 for the electrode assembly 20 to use, so that the utilization rate of the electrolyte in the shell 10 is high, which is conducive to improving the reliability of the battery monomer 1, and the liquid absorbing piece 30 can better limit the expansion deformation of the electrode assembly 20, reduce the risk of metal ion precipitation in the electrode assembly 20, and thus improve the reliability of the battery device 100.

[0214] In some embodiments, the liquid absorbing amount per unit volume of the liquid absorbing piece 30 is 0.001g / cm 3 ~0.02g / cm 3 .

[0215] In some embodiments, the liquid absorbing amount per unit volume of the liquid absorbing piece 30 satisfies the condition: 0.001g / cm3~0.02g / cm3. The liquid absorbing amount per unit volume of the liquid absorbing piece 30 can be any one of 0.001g / cm3, 0.005g / cm3, 0.01g / cm3, 0.015g / cm3, 0.02g / cm3 or a value between any two of them.

[0216] The technical scheme of the embodiment of the application sets the liquid absorbing amount per unit volume of the liquid absorbing piece 30 to satisfy the above condition, so that the liquid absorbing piece 30 has good effect on absorbing electrolyte, thereby reducing the risk of insufficient electrolyte.

[0217] The embodiment of the application also provides a battery including the battery monomer 1 of any one of the above embodiments.

[0218] The application also provides a battery cell 1 or a battery as described above.

[0219] Please refer to Figures 3 to 6 In some embodiments, the battery cell 1 can include an electrode assembly 20, a liquid absorbing member 30, an electrolyte, a housing 10, and an electrode terminal 14, the electrode assembly 20 and the electrolyte being disposed in the housing 10. The housing 10 can include a shell 15 having an opening and an end cover 16 sealing the opening to isolate the internal environment of the battery cell 1 from the external environment, and the electrode terminal 14 being disposed on the end cover 16.

[0220] The shell 15 includes a bottom wall 17, two first side walls 18, and two second side walls 19, the bottom wall 17 and the end cover 16 being oppositely disposed along the second direction Y, the two first side walls 18 being oppositely disposed along the first direction X, and the two second side walls 19 being oppositely disposed along the third direction Z. The first side wall 18 and the second side wall 19 can be arranged around the outer periphery of the bottom wall 17, and in the second direction Y, one end of the first side wall 18 and one end of the second side wall 19 are connected to the bottom wall 17, and the other end forms an opening.

[0221] The two ends of the first side wall 18 in the third direction Z are connected to the two second side walls 19 respectively, and the two ends of the second side wall 19 in the first direction X are connected to the two first side walls 18 respectively. The surface area of the first side wall 18 is greater than the surface area of the second side wall 19, and is greater than the surface area of the end cover 16 and the surface area of the bottom wall 17.

[0222] In some embodiments, the number of the liquid absorbing members 30 is multiple, and the multiple liquid absorbing members 30 are disposed on the two outer surfaces of the electrode assembly 20 corresponding to the two first side walls 18, the two outer surfaces being spaced apart along the first direction X, and the multiple liquid absorbing members 30 being spaced apart along the second direction Y.

[0223] The technical scheme of the application can store the electrolyte outside the electrode assembly 20 by arranging the liquid absorbing member 30 between the first side wall 18 and the electrode assembly 20. During the charging and discharging cycle of the battery cell 1, the electrolyte is gradually consumed, and when the electrode assembly 20 expands, the electrode assembly 20 can extrude the liquid absorbing member 30 to extrude the electrolyte in the liquid absorbing member 30 for use by the electrode assembly 20, thereby increasing the utilization rate of the electrolyte in the housing 10. In addition, since the liquid absorbing member 30 is arranged between the electrode assembly 20 and the housing 10, the liquid absorbing member 30 can limit the expansion and deformation of the electrode assembly 20, reduce the risk of metal ion precipitation in the electrode assembly 20, and improve the reliability of the battery cell 1. Furthermore, the multiple liquid absorbing members 30 are spaced apart, so that the liquid absorbing member 30 does not need to be arranged between the surface of the housing 10 and the surface of the electrode assembly 20, thereby saving the material required for the liquid absorbing member 30 and saving costs.

[0224] While the present application has been described with reference to the preferred embodiments, it is to be understood that various other modifications could be made without departing from the scope of the present application. In particular, the technical features mentioned in the various embodiments can be combined in any way, as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but covers all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell; an electrode assembly contained in the shell; an electrolyte contained in the shell; a liquid absorbing member arranged between the shell and at least part of the surface of the electrode assembly, the liquid absorbing member being used to absorb the electrolyte; wherein the number of the liquid absorbing members is multiple, and the multiple liquid absorbing members are arranged at intervals.

2. The battery cell of claim 1, wherein, The shell comprises two first walls arranged oppositely along a first direction, and the liquid absorbing member is arranged between the electrode assembly and at least one of the first walls. Wherein the surface of the battery monomer perpendicular to the first direction is the surface with the largest area of the battery monomer.

3. The battery cell of claim 2, wherein, The shell comprises a second wall connecting the two first walls, and the second wall is located at one end of the first wall in a second direction. The battery monomer further comprises an electrode terminal arranged on the second wall, and the electrode terminal is connected with the tab of the electrode assembly. The multiple liquid absorbing members are arranged at intervals along the second direction, and the second direction is perpendicular to the first direction.

4. The battery cell of claim 3, wherein, In the second direction, the size of the liquid absorbing member is L1, and the condition is 5mm≤L1≤30mm.

5. The battery cell of claim 4, wherein, 10mm≤L1≤20mm.

6. The battery cell of claim 3, wherein, In the second direction, the distance between the adjacent two liquid absorbing members is D1, and the size of the electrode assembly is L2, and the condition is 0.01≤D1 / L2≤0.

1.

7. The battery cell of claim 6, wherein, 0.03≤D1 / L2≤0.

07.

8. The battery cell of claim 2, wherein, The shell comprises a second wall connecting the two first walls, and the second wall is located at one end of the first wall in a second direction. The battery monomer further comprises an electrode terminal arranged on the second wall, and the electrode terminal is connected with the tab of the electrode assembly. The multiple liquid absorbing members are arranged at intervals along a third direction, and the third direction, the first direction and the second direction are perpendicular to each other.

9. The battery cell of claim 8, wherein, In the third direction, the size of the liquid absorbing member is L3, and the size of the electrode assembly is L4, and the condition is 0.08≤L3 / L4≤0.

2.

10. The battery cell of claim 9, wherein, 0.1≤L3 / L4≤0.

15.

11. The battery cell of claim 8, wherein, In the third direction, the distance between the adjacent two liquid absorbing members is D2, and the size of the electrode assembly is L4, and the condition is 0.01≤D2 / L4≤0.

1.

12. The battery cell of claim 11, wherein, 0.03≤D2 / L4≤0.

07.

13. The battery cell of claim 2, wherein, In the first direction, the thickness of the liquid absorbing member is L5, and the condition is 50μm≤L5≤500μm.

14. The battery cell of claim 13, wherein, 100μm≤L5≤300μm.

15. The battery cell of claim 3, wherein, The electrode assembly comprises a main body area and two thinning areas, and the two thinning areas are respectively arranged at the two ends of the main body area in the second direction, and in the first direction, the size of the electrode tab in the main body area is greater than the size of the electrode tab in the thinning area. Part of the multiple liquid absorbing members is arranged in the thinning area, and the other part of the multiple liquid absorbing members is arranged in the main body area.

16. The battery cell of claim 1, wherein, The liquid absorbing member comprises a polystyrene film layer.

17. The battery cell of claim 1, wherein, The liquid absorbing amount per unit volume of the liquid absorbing member is 0.001 g / cm 3 ~ 0.02 g / cm 3 .

18. A battery device characterized by comprising: The battery monomer comprises any one of claims 1-17.

19. An electrical device, comprising: A battery cell as in any of claims 1-17 or a battery device as in claim 18 for providing electrical energy to the electrical consumer.

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