Battery monomer, battery device and electric device

Abstract

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell and an electrode assembly, the electrode assembly is accommodated in the shell, the electrode assembly comprises a pole piece and a flow guide part, the pole piece comprises a pole lug and a main body part which are connected with each other, the liquid absorption rate of the surface of the flow guide part is greater than that of the surface of the main body part, and the flow guide part is arranged on at least one side of at least part of the main body part in the thickness direction. And the electrolyte can infiltrate into the pole piece more quickly, so that the overall infiltration rate of the electrolyte to the electrode assembly is improved, and the infiltration effect of the electrolyte to the electrode assembly is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery device and an electrical device. Background Art

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] The battery device includes a battery cell, which includes a housing and an electrode assembly disposed in the housing. The electrode assembly has positive and negative electrode sheets. An electrolyte is injected into the housing of the battery cell. The electrolyte plays a role in conducting ions between the positive and negative electrodes. The rate at which the electrolyte infiltrates the electrode sheets directly affects the infiltration effect of the electrode assembly. How to improve the infiltration effect of the electrode assembly is an urgent problem to be solved. Summary of the invention

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can increase the infiltration rate of the electrolyte into the electrode sheet and improve the infiltration effect of the electrode assembly.

[0005] In a first aspect, the present application provides a battery cell, comprising: a shell; an electrode assembly, contained in the shell, the electrode assembly comprising a pole piece and a guide portion, the pole piece comprising a pole ear and a main body connected to each other, the liquid absorption rate of the surface of the guide portion is greater than the liquid absorption rate of the surface of the main body, and the guide portion is arranged on at least one side of at least a portion of the main body in its thickness direction.

[0006] In the scheme of the embodiment of the present application, the battery cell includes a shell and an electrode assembly, the electrode assembly is accommodated in the shell, the electrode assembly includes a pole piece and a guide portion, the pole piece includes a pole ear and a main body that are connected to each other, the liquid absorption rate of the surface of the guide portion is greater than the liquid absorption rate of the surface of the main body, and by arranging the guide portion on at least one side of at least part of the main body in its thickness direction, the electrolyte can infiltrate into the interior of the pole piece faster, which helps to improve the overall infiltration rate of the electrolyte into the electrode assembly and improve the infiltration effect of the electrolyte on the electrode assembly.

[0007] In some embodiments, the main body includes an edge region and a middle region, the edge region is arranged around the middle region, and the guide portion includes a guide member, which extends between the edge region and the middle region.

[0008] In the solution of the embodiment of the present application, by setting up guide members extending in the edge area and the middle area, the electrolyte can more fully infiltrate the interior of the electrode plate, thereby reducing the risk of poor infiltration inside the electrode plate and enhancing the wetting effect of the electrolyte on the electrode assembly.

[0009] In some embodiments, the flow guide comprises a body and a capillary channel, and the capillary channel is disposed through the body.

[0010] In the solution of the embodiment of the present application, the capillary channel is arranged through the main body so that the guide member can attract the electrolyte through the capillary effect, thereby enhancing the liquid absorption efficiency of the guide member and improving the wetting effect and wetting rate of the electrolyte on the electrode.

[0011] In some embodiments, the guide member is extended along the arrangement direction of the electrode lug and the main body.

[0012] In the solution of the embodiment of the present application, the electrolyte is more likely to infiltrate the main body from the pole ear, so the guide member is extended along the arrangement direction of the pole ear and the main body to facilitate the guide member to more fully contact the electrolyte and improve the guide efficiency of the guide member.

[0013] In some embodiments, the guide portion includes at least two guide members spaced apart from each other.

[0014] In the solution of the embodiment of the present application, at least two guide members are arranged at intervals to increase the overall contact area between the guide part and the electrolyte, thereby increasing the guide rate of the guide part.

[0015] In some embodiments, the minimum distance L between two adjacent flow guides satisfies L≥1 cm.

[0016] In the solution of the embodiment of the present application, when the minimum spacing between adjacent guide members meets the above requirements, it not only reduces the difficulty of setting the guide members, but also improves the problem of waste of guide members due to too dense arrangement of the guide members, too little electrolyte guided by a single guide member.

[0017] In some embodiments, the electrode assembly also includes an isolating member, the pole piece is located between two adjacent isolating members, the guide member is adhesively connected to the adjacent pole pieces and the isolating members, and / or the guide portion also includes an adhesive member, the adhesive member is arranged in the edge area, and the adhesive member is adhesively connected to the adjacent pole pieces and the isolating members.

[0018] In the scheme of the embodiments of the present application, the guide member is adhesively connected to adjacent pole pieces and the isolation member to improve the problem of increased spacing between adjacent pole pieces, longer ion transmission path, and increased risk of lithium plating on the pole pieces during battery cell processing and use, and / or an adhesive member is arranged in the edge area of ​​the pole piece, and the adjacent pole pieces and the isolation member are adhesively connected by the adhesive member to improve the problem of increased spacing in the edge area of ​​adjacent pole pieces, which leads to increased risk of lithium plating on the pole pieces.

[0019] In some embodiments, the guide portion includes a guide portion and an adhesive portion, and the adhesive portion and the guide portion are spaced apart.

[0020] In the solution of the embodiment of the present application, the adhesive and the guide are arranged at intervals to improve the problem of increased risk of lithium plating in the electrode due to the increase in the distance between adjacent electrode sheets in the overlapping area of ​​the adhesive and the guide.

[0021] In some embodiments, the guide portion includes an adhesive portion, and along the arrangement direction of the pole lug and the main body, the adhesive is arranged on at least one side edge of the main body.

[0022] In the solution of the embodiment of the present application, a larger gap is more likely to be generated between adjacent pole pieces at the edge portions along the arrangement direction of the pole ears and the main body. Therefore, arranging the adhesive here is more conducive to exerting the effect of the adhesive and reducing the risk of lithium plating in the pole pieces.

[0023] In some embodiments, the flow guide extends along a curved path.

[0024] In the solution of the embodiment of the present application, the guide portion extends along a curved path to increase the contact area between the guide portion and the electrolyte and improve the guide performance of the guide portion.

[0025] In some embodiments, the thickness H of the guide portion satisfies 1 nm≤H≤50000 nm.

[0026] In the solution of the embodiment of the present application, when the thickness of the guide part meets the above conditions, it can improve the problem that the guide part is too thin, its surface area is too small, and the guide effect is poor; it also improves the problem that the guide part is too thick, resulting in an increase in the distance between adjacent pole pieces and an increased risk of lithium plating.

[0027] In some embodiments, the electrode sheets include a positive electrode sheet and a negative electrode sheet, and the guide portions are arranged on both sides of the positive electrode sheet in the thickness direction, or the guide portions are arranged on both sides of the negative electrode sheet in the thickness direction.

[0028] In the solution of the embodiment of the present application, the guide part is arranged on both sides of the positive electrode sheet or the negative electrode sheet, which not only improves the problem of excessive distance between adjacent electrode sheets due to the arrangement of the guide part, but also reduces the difficulty of matching the guide part and the electrode sheet.

[0029] In some embodiments, each adjacent pole piece is provided with a guide portion on the same side in the thickness direction thereof.

[0030] In the solution of the embodiment of the present application, by providing a guide portion on the same side of each adjacent electrode sheet in the thickness direction, the problem of excessive distance between adjacent electrode sheets due to the provision of the guide portion is improved, and the uniformity of electrolyte infiltration of each electrode sheet is improved.

[0031] In a second aspect, the present application provides a battery device, comprising a battery cell according to the embodiment of the first aspect.

[0032] In a third aspect, the present application provides an electrical device, comprising the battery device of the above-mentioned second aspect embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application; Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application; Figure 3 It is a structural schematic diagram of a battery module provided in one embodiment of the application; Figure 4 is an exploded diagram of a battery cell provided in one embodiment of the present application; Figure 5 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in one embodiment of the present application; Figure 6 is a partial structural schematic diagram of an electrode assembly of a battery cell provided in another embodiment of the present application; Figure 7 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in one embodiment of the present application; Figure 8 This is a schematic structural diagram of a flow guide member of a battery cell provided in one embodiment of the present application; Fig. 9 is a partial structural schematic diagram of an electrode assembly of a battery cell provided in another embodiment of the present application; Fig.10 is a partial structural schematic diagram of an electrode assembly of a battery cell provided in another embodiment of the present application; Fig.11 is a partial structural schematic diagram of an electrode assembly of a battery cell provided in another embodiment of the present application; Fig.12 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in yet another embodiment of the present application.

[0034] Description of reference numerals: 1. Vehicle; 101. Motor; 102. Controller; 2. Battery device; 201. Battery module; 202. Box; 2021. First box; 2022. Second box; 3. Battery cells; 4. Shell; 5. Electrode assembly; 51. Pole piece; 52. Flow guide; 53. Isolator; 511. Pole ear; 512. Main body; 513. Middle area; 514. Edge area; 515. Positive electrode piece; 516. Negative electrode piece; 521. Flow guide; 522. Adhesive; 5211. Main body; 5212. Capillary channel; 6. Top cover assembly. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0037] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0038] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0042] The battery device includes a battery cell, which includes a shell and an electrode assembly arranged in the shell, and the electrode assembly has positive and negative electrode sheets; an electrolyte is injected into the shell of the battery cell, and the electrolyte plays a role in conducting ions between the positive and negative electrodes. The wetting rate of the electrolyte on the electrode sheets directly affects the wetting effect of the electrode assembly.

[0043] In the related art, after the electrode assembly is wound into the shell, the electrolyte infiltrates the electrode slowly due to the large pressure between the electrode pieces and the slow liquid absorption rate on the electrode surface.

[0044] Based on the above problems, an embodiment of the present application provides a battery cell, which includes a shell and an electrode assembly. The electrode assembly is accommodated in the shell, and the electrode assembly includes a pole piece and a guide portion. The pole piece includes a pole ear and a main body that are connected to each other. The liquid absorption rate of the guide portion surface is greater than the liquid absorption rate of the main body surface. By arranging the guide portion on at least one side of at least a portion of the main body in its thickness direction, the electrolyte can infiltrate into the interior of the pole piece faster, which helps to improve the overall infiltration rate of the electrolyte into the electrode assembly and improve the wetting effect of the electrolyte on the electrode assembly.

[0045] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0046] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0047] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0048] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application. The battery cell can be cylindrical, flat, rectangular or other shapes, which is not limited in the embodiments of the present application.

[0049] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application may include a battery module or a battery pack. The battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0050] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a welding portion for connecting the positive electrode ear, the positive electrode current collector is coated with a positive electrode active material layer, and the positive electrode ear is not coated with a positive electrode active material layer. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a welding portion for connecting the negative electrode ear, the negative electrode current collector is coated with a negative electrode active material layer, and the negative electrode ear is not coated with a negative electrode active material layer. The negative electrode current collector may be made of copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon or silicon, etc. The separator may be made of PP (polypropylene) or PE (polyethylene), etc.

[0051] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including a box and electrical equipment using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0052] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 102 and a motor 101, and the controller 102 is used to control the battery to power the motor 101, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0053] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0054] Figure 2 A schematic structural diagram of a battery device according to an embodiment of the present application is shown.

[0055] The battery device 2 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 3, and the plurality of battery cells 3 are connected in series, in parallel or in mixed connection through a busbar.

[0056] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 3 .

[0057] As an example, the battery cell assembly may be a battery module 201, and the battery module 201 is formed by arranging and fixing a plurality of battery cells 3 to form an independent module. As an example, the battery module 201 may be formed by bundling a plurality of battery cells 3 by a cable tie.

[0058] In some embodiments, the battery device may be a battery pack, which includes a case 202 and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case 202 .

[0059] As an example, the battery cell assembly may be a battery module 201 , and the battery cell assembly may be accommodated in the box by fixing the battery module 201 in the box.

[0060] As an example, the battery cell assembly may also be accommodated in the box body 202 by directly fixing the plurality of battery cells 3 to the box body 202 .

[0061] As an example, the box 202 may include a first box 2021 and a second box 2022. The first box 2021 and the second box 2022 are buckled together to form a closed space inside the box 202 to accommodate the battery monomer assembly. The closed space here means covering or closing, which can be sealed or unsealed. The first box 2021 can be a top cover or a bottom plate.

[0062] As an example, the box body 202 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 202 to accommodate the battery cell assembly.

[0063] In some embodiments, the box 202 can be used as a part of the chassis structure of the vehicle. For example, a part of the box 202 can become at least a part of the floor of the vehicle, or a part of the box 202 can become at least a part of the cross beam and the longitudinal beam of the vehicle.

[0064] Figure 3 A schematic structural diagram of a battery module 201 according to an embodiment of the present application is shown.

[0065] In some embodiments, Figure 2 and Figure 3As shown, there are multiple battery cells 3, and the multiple battery cells 3 are first connected in series, parallel or mixed to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel or mixed to form a whole, and are accommodated in the box 202.

[0066] The multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0067] Figure 4 FIG. 1 is an exploded view of a battery cell provided in an embodiment of the present application. A battery cell 3 refers to the smallest unit constituting a battery. Figure 4 The battery cell 3 includes a top cover assembly 6 , a shell 4 and an electrode assembly 5 .

[0068] The electrode assembly 5 is a component in the battery cell 3 where electrochemical reactions occur. One or more electrode assemblies 5 may be included in the housing 4. The electrode assembly 5 is mainly formed by winding or stacking pole sheets, which are divided into positive pole sheets and negative pole sheets, and a separator is usually provided between the positive pole sheet and the negative pole sheet. The parts of the positive pole sheet and the negative pole sheet with active materials constitute the electrode body, and the parts of the positive pole sheet and the negative pole sheet without active materials each constitute a pole ear 511. The positive pole ear and the negative pole ear may be located together at one end of the electrode body or respectively at both ends of the electrode body. During the charge and discharge process of the battery cell 3, the positive active material and the negative active material react with the electrolyte, and the pole ear 511 connects the electrode terminal to form a current loop.

[0069] The electrode assembly 5 may be a winding structure, a laminated structure, or a mixed structure of winding and laminated structures.

[0070] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] In some embodiments, the electrode assembly 5 is a laminated structure. As an example, a plurality of positive and negative electrodes may be provided, and the plurality of positive and negative electrodes may be alternately stacked, and a plurality of separators may be provided, and each separator may be provided between any adjacent positive or negative electrodes, or the separator may be provided continuously and folded between any adjacent positive or negative electrodes.

[0072] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or polygonal.

[0073] In some embodiments, the electrode assembly 5 is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0074] The battery cell 3 may include a shell. The shell 4 is a component used to cooperate with the top cover assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment can be used to accommodate the electrode assembly 5, the electrolyte (not shown in the figure) and other components. The shell 4 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. In some embodiments, the shell 4 can be a sealed structure or a non-sealed structure. As an example, when the shell 4 is a non-sealed structure, the shell 4 plays a role in protecting the electrode assembly 5, and a sealing bag is also included between the shell 4 and the electrode assembly 5, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 4 is a sealed structure, it is used to encapsulate components such as the electrode assembly 5 and the electrolyte.

[0075] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0076] The housing 4 and the top cover assembly 6 may be independent components, and one or more openings may be provided on the housing 4, and one or more top cover assemblies 6 cover the openings to form the internal environment of the battery cell 3. Optionally, the top cover assembly 6 and the housing 4 may be integrated. Optionally, the top cover assembly 6 and the housing 4 may form a common connection surface before other components are placed in the housing, and when the interior of the housing 4 needs to be encapsulated, the top cover assembly 6 covers the housing 4.

[0077] In some embodiments, the electrode terminal may be disposed on the top cover assembly 6 or on the housing 4, and the electrode terminal is electrically connected to the tab 511. The electrode terminal may be directly connected to the tab 511 or indirectly connected to the tab 511 through a switching mechanism.

[0078] See also Figure 5 , Figure 5 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in one embodiment of the present application.

[0079] First, as Figure 4 and Figure 5 As shown, the present application provides a battery cell 3, the battery cell 3 includes a shell 4 and an electrode assembly 5, the electrode assembly 5 is accommodated in the shell 4, the electrode assembly 5 includes a pole piece 51 and a guide portion 52, the pole piece 51 includes a pole ear 511 and a main body 512 connected to each other, the liquid absorption rate of the surface of the guide portion 52 is greater than the liquid absorption rate of the surface of the main body 512, and the guide portion 52 is arranged on at least one side of at least a portion of the main body 512 in its thickness direction.

[0080] In the solution of the embodiment of the present application, the battery cell 3 includes a housing 4 and an electrode assembly 5. The electrode assembly 5 is accommodated in the housing 4. The electrode assembly 5 includes a pole piece 51 and a current collector 52. The pole piece 51 includes a tab 511 and a main body 512 connected to each other. The liquid absorption rate of the surface of the current collector 52 is greater than that of the surface of the main body 512. By disposing the current collector 52 on at least one side of at least a part of the main body 512 in its thickness direction, the electrolyte can infiltrate into the pole piece 51 faster, which helps to improve the overall infiltration rate of the electrolyte into the electrode assembly 5 and the infiltration effect of the electrolyte on the electrode assembly 5.

[0081] The pole piece 51 includes a current collector and an active material layer. The current collector includes a tab 511 and an active material section. The active material layer is disposed on the active material section. Then the main body 512 is a combination of the active material section of the current collector and the active material layer.

[0082] The liquid absorption rate of the surface of the current collector 52 and the liquid absorption rate of the surface of the main body 512 refer to the absorption rate of the electrolyte by the current collector 52 and the absorption rate of the electrolyte by the main body 512.

[0083] Specifically, the liquid absorption rate of the surface of the current collector 52 is greater than that of the surface of the main body 512. The infiltration rate of the electrolyte on the surface of the current collector 52 is faster than that of the electrolyte on the main body 512, so as to improve the infiltration speed of the electrolyte into the pole piece 51.

[0084] Optionally, it is achieved by setting the surface roughness of the current collector 52 to be greater than that of the main body 512; or the porosity of the current collector 52 is higher than that of the main body 512; or the surface energy of the current collector 52 is higher than that of the main body 512. The liquid absorption rate of the current collector 52 is greater than that of the main body 512.

[0085] Optionally, the specific material of the current collector 52 can be designed by itself. Exemplarily, the material of the current collector 52 can be one or more of PVDF (polyvinylidene difluoride), CMC (Carboxymethyl Cellulose), and ceramics. Exemplarily, the current collector 52 is a micro-nano structure member.

[0086] Optionally, the shape of the current collector 52 can be designed by itself. Exemplarily, the current collector 52 is strip-shaped or dot-shaped, etc.

[0087] Optionally, the current collector 52 is coated or adhered or embedded on the surface of the main body 512.

[0088] Specifically, the guide portion 52 is disposed on one side or both sides of the main body 512 in the thickness direction thereof; the guide portion 52 can be designed on a number of pole pieces 51 according to actual conditions.

[0089] Optionally, the guide portion 52 extends along a straight path to reduce the difficulty of processing the guide portion 52; or the guide portion 52 is distributed in an island shape on the surface of the main body 512 to reduce the risk of the guide portion 52 breaking under the action of external force.

[0090] See also Figure 6 , Figure 6 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in another embodiment of the present application.

[0091] In other embodiments, Figure 6 As shown, the air guide 52 extends along a curved path.

[0092] In these embodiments, the guide portion 52 extends along a curved path to increase the contact area between the guide portion 52 and the electrolyte, thereby improving the guide performance of the guide portion 52 .

[0093] Optionally, the guide portion 52 extends along a curved and / or folded path. Exemplarily, the guide portion 52 extends along a curved path, which reduces the risk of the tip of the guide portion 52 piercing the isolation member 53 .

[0094] Optionally, the capillary channel 5212 extends along a curved path, or the flow guide portion 52 includes at least two curved sections, and the capillary channel 5212 extends along a straight path between adjacent curved sections.

[0095] See also Figure 7 , Figure 7 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in one embodiment of the present application.

[0096] In other embodiments, Figure 5 and Figure 7 As shown, the thickness H of the guide portion 52 satisfies 1nm≤H≤50000nm.

[0097] In these embodiments, when the thickness of the guide portion 52 meets the above conditions, it can improve the problem that the guide portion 52 is too thin, its surface area is too small, and the guide effect is poor; it can also improve the problem that the guide portion 52 is too thick, resulting in an increase in the distance between adjacent pole pieces 51 and an increased risk of lithium plating.

[0098] The thickness direction of the guide portion 52 is the arrangement direction of adjacent pole pieces 51. By adjusting the thickness of the guide portion 52, the distance between adjacent pole pieces 51 can be adjusted to improve the problem of increased lithium plating risk caused by excessively large distance between adjacent pole pieces 51 and too long ion transmission path, which hinders ion deintercalation.

[0099] Exemplarily, the thickness of the guide portion 52 may be 1 nm, 2 nm, 500 nm, 25000 nm, 40000 nm, 50000 nm, etc.

[0100] In some embodiments, Figure 5 As shown, the main body 512 includes an edge region 514 and a middle region 513 , the edge region 514 is arranged around the middle region 513 , and the guide portion 52 includes a guide member 521 , which extends between the edge region 514 and the middle region 513 .

[0101] In these embodiments, the guide members 521 extending from the edge region 514 and the middle region 513 are provided so that the electrolyte can more fully infiltrate the interior of the pole piece 51, thereby reducing the risk of poor infiltration inside the pole piece 51 and enhancing the wetting effect of the electrolyte on the electrode assembly 5.

[0102] During the process of the electrolyte infiltrating the electrode assembly 5, the electrolyte infiltrates from the edge area 514 toward the middle area 513, but due to the liquid seal, the middle area 513 of the main body 512 is prone to form an un-wetted area. In the embodiment of the present application, by providing a guide member 521 extending between the edge area 514 and the middle area 513, the electrolyte can be guided to the middle area 513 through the guide member 521, or further, the electrolyte can infiltrate at least part of the un-wetted area of ​​the middle area 513 through the guide member 521, which helps to improve the problem of poor wetting of the middle area 513.

[0103] Specifically, the main body 512 includes a first surface on one side in the thickness direction thereof, the first surface includes a middle region 513 and an edge region 514 surrounding the middle region 513, the surface area S of the first surface, the surface area S1 of the middle region 513, and the area S2 of the edge region 514, satisfying S=S1+S2.

[0104] It should be clear that the specific area and shape of the middle region 513 can be designed according to actual conditions.

[0105] Optionally, 0.03S≤S1≤0.15S, so that the electrolyte can be fully guided by the guide member 521 to the inside of the electrode 51. Exemplarily, S1 can be 0.03S, 0.1S, 0.15S, etc.

[0106] Optionally, the greater the distance between the main body 512 and its edge, the greater the probability of the non-wetted area. Therefore, the middle area 513 is arranged in the center of the main body 512, so that the guide 521 can more effectively guide the electrolyte to the inside of the main body 512 to improve the problem of poor wetting. Exemplarily, the middle area 513 and the first surface have the same shape but different sizes, so that the size from each edge of the middle area 513 to each edge of the first surface is the same, so as to evenly improve the wetting effect of the main body 512 in all directions.

[0107] Optionally, the two ends of the guide member 521 are respectively located in the middle area 513 and the edge area 514, so that the guide member 521 can guide the electrolyte to the middle area 513; or both ends of the guide member 521 are located in the edge area 514, and the guide member 521 passes through the middle area 513, so that the guide member 521 can guide the electrolyte to the middle area 513.

[0108] Optionally, at least part of the guides 521 overlap with the center of the main body 512 to effectively improve the problem of poor wetting inside the main body 512. Exemplarily, the middle area 513 is centrally arranged on the main body 512, and one end of the guides 521 is arranged at the center of the middle area 513, that is, one end of the guide 521 overlaps with the center of the main body 512, and the other end of the guide 521 extends toward the edge area 514.

[0109] See also Figure 8 , Figure 8 It is a schematic structural diagram of a flow guide member of a battery cell provided in one embodiment of the present application.

[0110] In some embodiments, Figure 5 and Figure 8 As shown, the flow guide 521 includes a body 5211 and a capillary channel 5212 , and the capillary channel 5212 is disposed through the body 5211 .

[0111] In these embodiments, the capillary channel 5212 is disposed throughout the body 5211 so that the guide member 521 can attract electrolyte through the capillary effect, thereby enhancing the liquid absorption efficiency of the guide member 521 and improving the wetting effect and wetting rate of the electrolyte on the electrode 51 .

[0112] Specifically, one end of the capillary channel 5212 faces the unwetted area, and the electrolyte can be quickly transported to the unwetted area through the capillary channel 5212 of the guide member 521; or the electrolyte is transported through the unwetted area by the capillary channel 5212, and the electrolyte penetrates into the unwetted area through the capillary channel 5212 under the action of the electrolyte concentration difference.

[0113] Optionally, the capillary channel 5212 extends along the extension direction of the body 5211 to reduce the difficulty of processing the capillary channel 5212 .

[0114] Optionally, both ends of the capillary channel 5212 are located in the middle region 513 , or both ends of the capillary channel 5212 are located in the middle region 513 and the edge region 514 , respectively.

[0115] Optionally, a plurality of capillary channels 5212 may be arranged at intervals in the flow guide 521 . Exemplarily, the number of the capillary channels 5212 is 1, 2, 3, 5, etc.

[0116] In some embodiments, Figure 4 and Figure 5 As shown, the guide member 521 is extended along the arrangement direction of the pole lug 511 and the main body 512 .

[0117] In these embodiments, the electrolyte is more likely to penetrate the main body 512 from the pole ear 511 , so the guide member 521 is extended along the arrangement direction of the pole ear 511 and the main body 512 to facilitate the guide member 521 to more fully contact the electrolyte and improve the guide efficiency of the guide member 521 .

[0118] Specifically, the electrode assembly 5 also includes an isolating member 53, which is arranged between adjacent main bodies 512. Since the isolating member 53 is not arranged at the pole ears 511 and the distance between adjacent pole ears 511 is large, it is easier for the electrolyte to infiltrate the main body 512. Therefore, a flow guide 521 is arranged to extend along the arrangement direction of the pole ears 511 and the main body 512, so that the flow guide 521 can contact the electrolyte faster and more fully to improve the flow guide efficiency of the flow guide 521; or the battery cell 3 includes a top cover assembly 6, which is connected to the pole ears 511 and covers the shell 4, and an injection hole is provided on the top cover assembly 6. The electrolyte is injected into the shell 4 through the injection hole, and the electrolyte first infiltrates the side of the main body 512 close to the pole ears 511.

[0119] Optionally, the guide 521 extends to the edge of the main body 512 close to the tab 511 to facilitate the guide 521 to fully and quickly contact the electrolyte. Exemplarily, one end of the guide 521 extends to the edge of the main body 512 close to the tab 511, and the other end extends to the edge of the main body 512 away from the tab 511.

[0120] Optionally, when the guide member 521 extends along a straight path, the straight path extends along the arrangement direction of the pole ear 511 and the main body 512; or the guide member 521 extends along a curved path, the axial direction of the curved path is the arrangement direction of the ear and the main body 512.

[0121] In some embodiments, Figure 5 As shown, the guide portion 52 includes at least two guide members 521 that are spaced apart.

[0122] In these embodiments, at least two flow guides 521 are arranged at intervals to increase the overall contact area between the flow guide portion 52 and the electrolyte, thereby increasing the flow guide rate of the flow guide portion 52 .

[0123] Exemplarily, the guide portion 52 is provided with 2, 3, 4, 5, etc. guide members 521 .

[0124] Optionally, the sizes, shapes and materials of the guide members 521 of the guide portion 52 are the same or different.

[0125] Optionally, a plurality of guide portions 52 are evenly spaced to help balance the wetting effect at various locations of the main body 512 .

[0126] In some embodiments, Figure 5 As shown, the minimum distance L between two adjacent flow guides 521 satisfies L≥1 cm.

[0127] In these embodiments, when the minimum spacing between adjacent guide members 521 meets the above requirements, it not only reduces the difficulty of setting the guide members 521, but also improves the problem of waste of guide members 521 due to too little electrolyte guided by a single guide member 521 due to the guide members 521 being too densely arranged.

[0128] Exemplarily, the minimum distance between two adjacent flow guides 521 may be 1 cm, 1.5 cm, 3 cm, 5 cm, etc.

[0129] Optionally, the guide member 521 and the edge of the main body 512 are spaced apart, which helps the guide member 521 to guide the electrolyte to the inside of the electrode piece 51 to improve the problem of poor wetting inside the electrode piece 51 .

[0130] See also Fig. 9 and Fig.10 , Fig. 9 is a partial structural schematic diagram of an electrode assembly of a battery cell provided in another embodiment of the present application; Fig.10 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in yet another embodiment of the present application.

[0131] In some embodiments, Fig. 9 As shown, the electrode assembly 5 also includes an isolation member 53, the pole piece 51 is located between two adjacent isolation members 53, the guide member 521 is adhesively connected to the adjacent pole pieces 51 and the isolation members 53, and / or the guide portion 52 also includes an adhesive member 522, the adhesive member 522 is arranged in the edge area 514, and the adhesive member 522 is adhesively connected to the adjacent pole pieces 51 and the isolation members 53.

[0132] In these embodiments, the guide member 521 is adhesively connected to adjacent pole pieces 51 and the isolation member 53 to improve the problem that during the processing and use of the battery cell 3, the distance between adjacent pole pieces 51 is increased, the ion transmission path is extended, and the risk of lithium deposition of the pole pieces 51 is increased, and / or an adhesive member 522 is provided in the edge area 514 of the pole piece 51, and the adjacent pole pieces 51 and the isolation member 53 are adhesively connected by the adhesive member 522 to improve the problem that the distance between the edge area 514 of the adjacent pole pieces 51 is increased, resulting in an increased risk of lithium deposition of the pole piece 51.

[0133] Specifically, an isolator 53 is provided between adjacent pole pieces 51, ions are transmitted between adjacent pole pieces 51, and a flow guide 521 and / or an adhesive 522 are bonded between adjacent pole pieces 51 and the isolator 53 to improve the problem that the distance between adjacent pole pieces 51 is too large due to the expansion of the electrode assembly 5 during charging, the ion transmission path is extended, the ion deintercalation is affected, and the risk of lithium precipitation is increased. The flow guide 521 is bonded between the adjacent pole pieces 51 and the isolator 53 so that the flow guide 521 plays the role of both guiding and bonding, thereby improving the reliability of the flow guide 521; or an adhesive 522 is provided in the edge area 514 to reduce the problem that the distance between adjacent pole pieces 51 in the edge area 514 is too large.

[0134] Specifically, the liquid absorption rate of the adhesive 522 is greater than the liquid absorption rate of the main body 512 , and the adhesive 522 in the edge area 514 also helps to improve the wetting rate of the electrode assembly 5 .

[0135] Optionally, the middle region 513 is centrally arranged, and the edge region 514 is subjected to a smaller restraining force than the middle region 513, so the adhesive 522 is arranged in the edge region 514 to improve the problem of too large spacing between the edge regions 514 of adjacent pole pieces 51. Exemplarily, the adhesive 522 is arranged on one side edge of the edge region 514 away from the middle region 513.

[0136] Optionally, the materials of the adhesive member 522 and the guide member 521 are the same or different.

[0137] In some embodiments, Fig. 9 and Fig.10 As shown, the guide portion 52 includes a guide member 521 and an adhesive member 522 , and the adhesive member 522 and the guide member 521 are arranged at intervals.

[0138] In these embodiments, the adhesive 522 and the guide 521 are spaced apart to improve the problem of increased risk of lithium deposition in the electrode 51 due to the increase in the distance between adjacent electrode 51 in the overlapping area of ​​the adhesive 522 and the guide 521 .

[0139] Optionally, the guide portion 52 is disposed on a side of the bonding portion close to the middle region 513 .

[0140] Optionally, the minimum distance between the adhesive member 522 and the guide member 521 is between 1 mm and 50 mm. Exemplarily, the minimum distance between the adhesive member 522 and the guide member 521 is 1 mm, 2 mm, 25 mm, 50 mm, etc.

[0141] In some embodiments, Fig. 9 and Fig.10 As shown, the guide portion 52 includes an adhesive member 522 , and along the arrangement direction of the tabs 511 and the main body 512 , the adhesive member 522 is disposed on at least one side edge of the main body 512 .

[0142] In these embodiments, a larger gap is more likely to be formed between adjacent pole pieces 51 at the edge portions along the arrangement direction of the pole ears 511 and the main body 512 , so arranging the adhesive 522 here is more conducive to exerting the effect of the adhesive 522 and reducing the risk of lithium plating of the pole piece 51 .

[0143] The electrode assembly 5 includes a wound electrode assembly 5 of a wound pole piece 51 and a laminated electrode assembly 5 of stacked pole pieces 51, the first direction is parallel to the arrangement direction of the pole ear 511 and the main body 512, and the second direction is perpendicular to the arrangement direction of the pole ear 511 and the main body 512. For the wound electrode assembly 5, the edge size of the main body 512 in the first direction is greater than the edge size of the main body 512 in the second direction, so arranging the adhesive 522 at the edge of the main body 512 in the first direction is more conducive to exerting the effect of the adhesive 522; for the laminated electrode assembly 5, it usually includes a continuously extending separator 53, and the edges of adjacent pole pieces 51 in the second direction are fixed together by the separator 53, so arranging the main body 512 at its edge in the first direction is more conducive to exerting the effect of the adhesive 522.

[0144] Exemplarily, the middle region 513 is centrally arranged along the arrangement direction of the pole lug 511 and the main body 512, two bonding portions are arranged on the two side edges of the main body 512, and extend in a direction perpendicular to the arrangement direction of the pole lug 511 and the main body 512, a plurality of guide portions 52 are spaced apart from each other and arranged between the two bonding portions, and the guide portions 52 extend along the arrangement direction of the pole lug 511 and the main body 512.

[0145] Optionally, the adhesive member 522 extends continuously in the insulating region and is disposed around the middle region 513 . The electrolyte can penetrate the adhesive member 522 , which helps to improve the bonding reliability of the adhesive member 522 .

[0146] See also Fig.11 , Fig.11 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in yet another embodiment of the present application.

[0147] In some embodiments, Figure 5 and Fig.11 As shown, the electrode sheet 51 includes a positive electrode sheet 515 and a negative electrode sheet 516 , and the guide portions 52 are arranged on both sides of the positive electrode sheet 515 in the thickness direction, or the guide portions 52 are arranged on both sides of the negative electrode sheet 516 in the thickness direction.

[0148] In these embodiments, the guide portion 52 is disposed on both sides of the positive electrode sheet 515 or the negative electrode sheet 516 , which not only improves the problem of excessive spacing between adjacent electrode sheets 51 due to the provision of the guide portion 52 , but also reduces the difficulty of matching the guide portion 52 and the electrode sheet 51 .

[0149] Optionally, the shapes and sizes of the guide portions 52 disposed on each positive electrode sheet 515 or negative electrode sheet 516 may be the same or different.

[0150] Optionally, each pole piece 51 is provided with guide portions 52 on both sides in the thickness direction thereof to enhance the wetting effect of the electrolyte.

[0151] See also Fig.12 , Fig.12 It is a partial structural schematic diagram of an electrode assembly of a battery cell provided in yet another embodiment of the present application.

[0152] In some embodiments, Figure 5 and Fig.12 As shown, each adjacent pole piece 51 is provided with a guide portion 52 on the same side in the thickness direction thereof.

[0153] In these embodiments, by providing guide portions 52 on the same side of each adjacent pole piece 51 in the thickness direction, the problem of excessive spacing between adjacent pole pieces 51 due to the provision of the guide portions 52 is improved, and the uniformity of electrolyte infiltration of each pole piece 51 is improved.

[0154] Optionally, a guide portion 52 is provided on the outer side surface of the electrode assembly 5 to enhance the wetting effect of the outer electrode sheet 51 of the electrode assembly 5 .

[0155] The battery cell 3 provided by the present invention is introduced below through specific embodiments.

[0156] Comparative example: The positive electrode iron lithium is mixed with the positive electrode conductive agent SP and the positive electrode solvent N-methylpyrrolidone (NMP) in a double planetary mixer, wherein the positive electrode active material powder, the positive electrode conductive agent SP, the positive electrode binder HSV900 and the positive electrode solvent N-methylpyrrolidone (NMP) are mixed in a mass ratio of 97:1:2, the linear speed is 21 m / s, the time is 2.5 hours, and a positive electrode slurry with a solid content of 63.5% is obtained; The negative electrode graphite is mixed with the negative electrode conductive agent SP, the negative electrode dispersant JSR-104A and pure water in a double planetary mixer, wherein the negative electrode active material powder, the negative electrode conductive agent SP, the negative electrode binder MAC350HC, the negative electrode dispersant JSR-104A are mixed with pure water in a mass ratio of 96:1:1.4:1.6, the linear speed is 18 m / s, the time is 3 hours, and the negative electrode slurry with a solid content of 53.5% is obtained; The positive electrode slurry is coated on the aluminum foil, baked and dried, and rolled to form a positive electrode sheet 515; the negative electrode slurry is coated on the copper foil, baked and dried, and rolled to form a negative electrode sheet 516; The positive electrode sheet 515 is cut into small pieces with a length of 170 mm and a width of 65 mm; the negative electrode sheet 516 is cut into small pieces with a length of 175 mm and a width of 70 mm; The die-cut electrode pieces 51 are laminated to obtain an electrode assembly 5; The electrode assembly 5 is subjected to baking, liquid injection, formation, aging and capacity separation to obtain a battery cell 3 .

[0157] Embodiment 1: Figure 5 For convenience of description Figure 5 Only four flow guides 521 are shown, and 11 flow guides 521 made of PVDF material are arranged on both sides of the main body 512 of the negative electrode sheet 516. The flow guides 521 extend along the width direction of the negative electrode sheet 516. The length of the flow guide 521 is 65 mm, the width is 500 nm, and the thickness is 500 nm. The distances from the flow guides 521 to the edges on both sides of the width direction of the negative electrode sheet 516 are the same. The minimum distances from the flow guides 521 to the edges on both sides of the length direction of the negative electrode sheet 516 are both 30 mm. The spacing between adjacent flow guides 521 is 10.95 mm. The arrangement direction of the pole ear 511 and the main body 512 is the width direction of the negative electrode sheet 516; the middle area 513 is centrally arranged in the main body 512, and the surface area of ​​the middle area 513 is 10% of the surface area of ​​the main body 512. The shape of the middle area 513 is the same as that of the main body 512, and other conditions are the same as those of the comparative example.

[0158] Embodiment 2: Figure 6 For convenience of description Figure 6 Only four guides 521 are shown, and the guides 521 extend along a curved path along the width direction of the negative electrode sheet 516. The curved path compound Y=sin(X), where X is the minimum spacing from the guide 521 to the pole ear 511 along the width direction of the negative electrode sheet 516. Other conditions are the same as those in Example 1.

[0159] Embodiment 3: Fig. 9 For convenience of description Fig. 9Only four guide members 521 are shown, and adhesive members 522 are provided on both side edges of the negative electrode sheet 516 in the width direction. The adhesive member 522 has a length of 87.5 mm, a width of 200 nm, and a thickness of 500 nm. The adhesive member 522 and the guide member 521 are spaced 2 mm in the width direction of the negative electrode sheet 516. Other conditions are the same as those in Example 1.

[0160] After the comparative example and Examples 1-3 were charged and discharged for 500 times at 1C / 1C at 25°C, the lithium deposition areas of the negative electrode sheet 516 in the middle area 513 and the edge area 514 were detected as follows:

[0161] It can be seen from the data in the above table that by adopting the technical solution of the embodiment of the present application, the guide portion is arranged on at least one side of at least part of the main body in its thickness direction, so that the electrolyte can infiltrate into the interior of the electrode piece faster, which helps to improve the overall infiltration rate of the electrolyte on the electrode assembly, improve the infiltration effect of the electrolyte on the electrode assembly, and reduce the risk of lithium plating.

[0162] In a second aspect, the present application provides a battery device, comprising a battery cell according to the embodiment of the first aspect.

[0163] In a third aspect, the present application provides an electrical device, comprising the battery device of the above-mentioned second aspect embodiment.

[0164] In some embodiments, Figures 1 to 12As shown, the battery cell 3 includes a shell 4 and an electrode assembly 5, the electrode assembly 5 is accommodated in the shell 4, the electrode assembly 5 includes a pole piece 51 and a guide portion 52, the pole piece 51 includes a pole ear 511 and a main body 512 connected to each other, the main body 512 includes an edge area 514 and a middle area 513, the middle area 513 is centrally arranged, the edge area 514 is arranged around the middle area 513, the liquid absorption rate of the surface of the guide portion 52 is greater than the liquid absorption rate of the surface of the main body 512, the guide portion 52 is arranged on at least one side of at least part of the main body 512 in its thickness direction, the guide portion 52 includes a guide member 521 and an adhesive member 522 arranged at intervals, the guide member 521 includes a main body 5211 and a capillary channel 5212, the capillary channel 5212 is arranged through the main body 5211, and the guide member 521 is arranged along the pole ear 511 and The arrangement direction of the main body 512 extends to the middle area 513 and the edge area 514, the guide part 52 includes at least two guide members 521 arranged at intervals, and the minimum spacing L between two adjacent guide members 521 satisfies L≥1cm. The electrode assembly 5 also includes an isolating member 53, the pole piece 51 is located between two adjacent isolating members 53, the adhesive 522 is arranged in the edge area 514, the adhesive 522 and the guide member 521 are bonded to the adjacent pole piece 51 and the isolating member 53, the thickness H of the guide part 52 satisfies 1nm≤H≤50000nm, the pole piece 51 includes a positive pole piece 515 and a negative pole piece 516, the guide part 52 is arranged on both sides of the positive pole piece 515 in its thickness direction, or the guide part 52 is arranged on both sides of the negative pole piece 516 in its thickness direction.

[0165] In these embodiments, the battery cell 3 includes a shell 4 and an electrode assembly 5, the electrode assembly 5 is accommodated in the shell 4, the electrode assembly 5 includes a pole piece 51 and a guide portion 52, the pole piece 51 includes a pole ear 511 and a main body 512 connected to each other, the liquid absorption rate of the surface of the guide portion 52 is greater than the liquid absorption rate of the surface of the main body 512, and by arranging the guide portion 52 on at least one side of at least a portion of the main body 512 in its thickness direction, the electrolyte can infiltrate into the interior of the pole piece 51 faster, which helps to improve the overall infiltration rate of the electrolyte into the electrode assembly 5 and improve the infiltration effect of the electrolyte on the electrode assembly 5.

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

Claims

1. A battery cell, characterized in that: include: case; An electrode assembly is accommodated in the shell, the electrode assembly includes a pole piece and a guide portion, the pole piece includes a pole ear and a main body portion connected to each other, the liquid absorption rate of the surface of the guide portion is greater than the liquid absorption rate of the surface of the main body portion, and the guide portion is arranged on at least one side of at least part of the main body portion in its thickness direction.

2. The battery cell according to claim 1, characterized in that: The main body portion includes an edge region and a middle region, the edge region is arranged around the middle region, and the flow guide portion includes a flow guide member, and the flow guide member extends between the edge region and the middle region.

3. The battery cell according to claim 2, characterized in that: The flow guide comprises a body and a capillary channel, and the capillary channel is arranged through the body.

4. The battery cell according to claim 2, characterized in that: The flow guide is extended along the arrangement direction of the pole lug and the main body.

5. The battery cell according to claim 2, characterized in that: The flow guide portion includes at least two flow guide members which are spaced apart from each other.

6. The battery cell according to claim 5, characterized in that: The minimum distance L between two adjacent flow guides satisfies L≥1 cm.

7. The battery cell according to claim 2, characterized in that: The electrode assembly also includes an isolating member, the pole piece is located between two adjacent isolating members, the flow guide member is adhesively connected to the adjacent pole pieces and the isolating members, and / or the flow guide portion also includes an adhesive member, the adhesive member is arranged in the edge area, and the adhesive member is adhesively connected to the adjacent pole pieces and the isolating members.

8. The battery cell according to claim 7, characterized in that: The flow guide portion includes the flow guide member and the adhesive member, and the adhesive member and the flow guide member are arranged at an interval.

9. The battery cell according to claim 7, characterized in that: The guide portion includes the adhesive component, and along the arrangement direction of the tabs and the main body, the adhesive component is arranged on at least one side edge of the main body.

10. The battery cell according to claim 1, characterized in that: The flow guide portion extends along a curved path.

11. The battery cell according to claim 1, characterized in that: The thickness H of the guide portion satisfies 1nm≤H≤50000nm.

12. The battery cell according to claim 1, characterized in that: The electrode sheets include a positive electrode sheet and a negative electrode sheet, and the guide portions are arranged on both sides of the positive electrode sheet in the thickness direction, or the guide portions are arranged on both sides of the negative electrode sheet in the thickness direction.

13. The battery cell according to claim 1, characterized in that: Each adjacent pole piece is provided with a guide portion on the same side in the thickness direction thereof.

14. A battery device, characterized in that: A battery cell comprising any one of claims 1 to 13.

15. An electrical device, characterized in that: A battery device comprising the battery device described in claim 14 above.

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