WO2024007258A1 - 极片组件、电极组件、电池单体、电池和用电设备 - Google Patents

极片组件、电极组件、电池单体、电池和用电设备 Download PDF

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Publication number
WO2024007258A1
WO2024007258A1 PCT/CN2022/104401 CN2022104401W WO2024007258A1 WO 2024007258 A1 WO2024007258 A1 WO 2024007258A1 CN 2022104401 W CN2022104401 W CN 2022104401W WO 2024007258 A1 WO2024007258 A1 WO 2024007258A1
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WIPO (PCT)
Prior art keywords
pole piece
protective layer
main
end region
assembly
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PCT/CN2022/104401
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English (en)
French (fr)
Inventor
谷慧
姜玲燕
金海族
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/104401 priority Critical patent/WO2024007258A1/zh
Publication of WO2024007258A1 publication Critical patent/WO2024007258A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof

Definitions

  • the present disclosure relates to the field of battery technology, and in particular, to a pole piece assembly, an electrode assembly, a battery cell, a battery and electrical equipment.
  • burrs may occur in the end area of battery pole pieces during the production and processing of pole pieces and electrode assemblies.
  • the positive electrode sheet, negative electrode sheet and separator are stacked in a predetermined order and then continuously wound to a suitable size on the winding equipment, and then the positive electrode sheet is cut off by a cutter on the winding equipment. , negative electrode piece and separator.
  • the wound positive electrode piece, negative electrode piece and separator form an electrode assembly.
  • Burrs are easily generated near the main end surface of the positive electrode piece or negative electrode piece. Battery cells with pole pieces or electrode assemblies with burrs in the end areas will swell during use, and subsequently internal damage may occur near the corresponding end areas of the positive and negative electrode tabs with burrs. short circuit.
  • the present disclosure aims to provide a pole piece assembly, an electrode assembly, a battery cell, a battery and electrical equipment that are less likely to cause an internal short circuit in a battery cell.
  • a first aspect of the present disclosure provides a pole piece assembly, including a pole piece and a protective layer.
  • the pole piece includes a pole piece body having end regions.
  • the protective layer is fixed on the pole piece main body and includes a protective layer main body section covering the end region along the extending direction of the end region.
  • the main body section of the protective layer includes a main end face main protection part and two side main body protection parts respectively connected to both sides of the main end face main protection part.
  • the main end surface body protection part covers the main end surface of the end area, and the side body protection part extends from the main end surface of the end area to the inside of the pole piece body and covers the side surface of the end area close to the main end surface.
  • a protective layer fixed on the pole piece body is provided at the end region of the pole piece of the pole piece assembly.
  • the protective layer includes a protective layer main body covering the end region along the extension direction of the end region. section, the main end surface body protection part 3211 and the two side body protection parts 3212 of the protective layer 32 can wrap the main end surface and side surfaces of the end area, thereby isolating the burrs in the end area of the pole piece body from the diaphragm, which is beneficial to Reduce the phenomenon of burrs at the end area piercing the separator, thereby helping to reduce the internal short circuit between the positive electrode plate body and the negative electrode plate body caused by the diaphragm being punctured, and improve the electrode assembly and battery cells including the electrode plate assembly. , the safety performance of batteries and electrical equipment.
  • a maximum distance between an edge of the side body protection part located inside the main end face of the end region and the main end face of the end region is 2 mm to 100 mm.
  • the contact area between the protective layer and the side of the end area is reasonable to ensure that the protective layer is in contact with the end area.
  • the bonding strength between the main end face and the side surface of the end area prevents part or all of the protective layer from falling off and affecting the protective effect.
  • it can limit the area of the side surface of the end area covered by the protective layer and limit the loss of battery capacity caused by the installation of the protective layer. .
  • the protective layer includes adhesive tape adhered to the pole piece body.
  • the protective layer is made of tape.
  • the tape itself is easy to prepare, and its shape and size can easily meet the design requirements.
  • the tape can be prepared before being assembled with the main body of the pole piece.
  • the tape is easy to assemble with the main body of the pole piece.
  • the assembly position of the tape on the main body of the pole piece is also easy. Control, the processing efficiency of the pole piece assembly is higher, and it has less impact on the production process of the electrode assembly.
  • the maximum distance between the edges of the two side body protection parts located inside the main end face of the end region and the main end face of the end region is equal.
  • the maximum distance between the edges of the two side body protection parts located inside the main end surface of the end area and the main end surface of the end area is set to be equal, which is beneficial to the contact area of the two side body protection parts with the side surfaces of the end area.
  • the bonding strength of the protective layer and the two sides is close to each other, so it is not easy for unilateral detachment to occur and the gradual occurrence of unilateral detachment.
  • the phenomenon of the protective layer falling off as a whole is beneficial to ensuring the protective effect of the protective layer, and is also conducive to making the area of the sides of the two side body protective parts covering the end area uniform, reducing the problem of excessive area of the side covering the end area on one side. situation, thereby reducing the impact of setting the protective layer on battery capacity.
  • the two side body protection parts are arranged symmetrically with respect to the thickness direction of the pole piece.
  • the two side body protection parts are arranged symmetrically with respect to the thickness direction of the pole piece, which is conducive to the contact area of the two side body protection parts and the side of the end area being within a reasonable range and relatively consistent, which is conducive to the main connection between the protective layer and the end area.
  • the bonding strength between the end face and the two sides is reasonable and close, and the bonding strength between the protective layer and the two sides is close. It is not easy for unilateral detachment to occur and the unilateral detachment will gradually cause the entire protective layer to fall off, which is beneficial to ensuring protection.
  • the protective effect of the layer is also conducive to making the area of the sides of the end area covered by the two side body protection parts consistent, reducing the situation where the area of the side covering the end area on one side is too large, thereby reducing the impact of the protective layer on the battery Capacity impact.
  • the edge of the side body protection part located inside the main end face of the end region is a straight edge; or the edge of the side body protection part located inside the main end face of the end region is a folded edge. ; Or the edge of the side body protection part located inside the main end surface of the end area is a curved edge; or the edge of the side body protection part located inside the main end surface of the end area is a combination of a straight edge and a curved edge. edge.
  • the edge on the inner side of the main end surface of the end area of the side body protection part is a straight edge, which facilitates the processing and manufacturing of the protective layer and the pole piece assembly, and also helps reduce the risk of damage to the protective layer.
  • Setting the edge of the side body protection part located inside the main end surface of the end area as a folded edge, a curved edge or a combined edge including a straight edge and a curved edge is beneficial to ensuring the connection between the protective layer and the pole piece body.
  • the combined area ensures the bonding strength between the protective layer and the main body of the pole piece, while minimizing the area covered by the protective layer on the main body of the pole piece and reducing the impact of the protective layer on the battery capacity.
  • the side body protection part is rectangular; or the edge side of the side body protection part located inside the main end face of the end region includes at least one protrusion protruding toward a side away from the main end face. department.
  • the side body protection part in a rectangular shape facilitates the processing and manufacturing of the protective layer and pole piece components, and also helps reduce the risk of damage to the protective layer.
  • the impact of the protective layer on the pole piece body is more consistent along the extension direction of the end area.
  • At least one protruding portion protruding toward the side away from the main end surface is provided on the edge side of the side body protection portion located inside the main end surface of the end area, thereby ensuring the bonding area between the protective layer and the pole piece body. While improving the bonding strength between the protective layer and the main body of the pole piece, it also minimizes the area covered by the protective layer on the main body of the pole piece and reduces the impact of the protective layer on the battery capacity.
  • the edge of the protruding side of the protruding portion is a folded edge or a curved edge.
  • edge of the protruding side of the protruding part As a folded edge or a curved edge, it is possible to maximize the bonding area between the protective layer and the main body of the pole piece, thereby ensuring the bonding strength between the protective layer and the main body of the pole piece. Reduce the area of the main body of the pole piece covered by the protective layer and reduce the impact of the protective layer on battery capacity.
  • the side body protection portion includes a plurality of protrusions connected in series along an extension direction of the end region.
  • the edge of the protruding side of the protruding part As a folded edge or a curved edge, it is possible to ensure the bonding area between the protective layer and the main body of the pole piece, thereby ensuring the bonding strength between the protective layer and the main body of the pole piece, while minimizing the risk to the maximum extent.
  • the small protective layer covers the area of the main body of the pole piece, reducing the impact of the protective layer on the battery capacity.
  • At least a portion of at least two of the plurality of protrusions has the same shape and size.
  • the edge of the protruding side of the protruding part As a folded edge or a curved edge, it is possible to ensure the bonding area between the protective layer and the main body of the pole piece, thereby ensuring the bonding strength between the protective layer and the main body of the pole piece, while minimizing the risk to the maximum extent.
  • the small protective layer covers the area of the main body of the pole piece, reducing the impact of the protective layer on the battery capacity.
  • the main end surface body protection part is fit and connected to the main end face of the end region of the pole piece; the side body protection part is fit and connected to the side of the end region close to the main end face.
  • the main end face body protection part is fit and connected to the main end face of the end area of the pole piece, and the side body protection part is fit and connected to the side of the end area close to the main end face, which can reduce the space occupied by the protective layer and increase the protective layer.
  • the combined area with the end area is conducive to reducing the size of the protective layer and saving the material of the protective layer on the basis of meeting the bonding strength of the protective layer and the pole piece.
  • the protective layer further includes a protective layer extension section connected to an end of the protective layer main section along the extension direction of the end region.
  • the protective layer extension section can protect the end with the protective layer extension section in the extension direction of the end area, preventing burrs at the end from piercing the diaphragm, which is conducive to further reducing the phenomenon of burrs at the end area piercing the diaphragm. This will help further reduce the internal short circuit of the positive electrode plate body and the negative electrode plate body caused by the puncture of the separator, and improve the safety performance of the electrode assembly, battery cells, batteries and electrical equipment including the electrode assembly.
  • the length of the protective layer extension section along the extension direction of the end region is less than or equal to 20 mm.
  • the length of the protective layer extension section can protect the end with the protective layer extension section in the extension direction of the end region, while preventing further processing of the pole piece assembly or damage to the pole piece.
  • additional local stress will be exerted on the pole piece due to contact with the extended section of the protective layer, preventing risks such as lithium precipitation caused by deformation of the pole piece.
  • two protective layer extension sections are respectively connected to both ends of the protective layer main section, and the lengths of the two protective layer extension sections are equal.
  • Providing protective layer extension sections at both ends of the main section of the protective layer can protect both ends of the end region in the extending direction, prevent burrs at both ends of the end region from piercing the diaphragm, and help further reduce the risk of damage at the end region.
  • the phenomenon of burrs piercing the separator will help further reduce the internal short circuit of the positive electrode plate body and the negative electrode plate body caused by the piercing of the separator, and improve the safety of the electrode assembly, battery cells, batteries and electrical equipment including the electrode assembly. performance.
  • Making the lengths of the two protective layer extension sections equal is conducive to setting the lengths of the protective layer extension sections at both ends to appropriate lengths, which is conducive to effective protection of both ends in the extension direction of the end area, and is also conducive to preventing single-end protection.
  • the improper length of the extension section of the protective layer causes additional local stress on the pole piece due to the force exerted on the extension section of the protective layer at this end, preventing risks such as lithium precipitation caused by the deformation of the pole piece.
  • the protective layer extension section includes a main end face extending guard portion toward an extending surface of a main end face of the end region and a side extending guard portion toward an extending surface of a side surface of the end region; and/or
  • the protective layer extension section includes a side end face protective portion covering a side end face of the end region along an extension direction of the end region.
  • the above structural forms of the protective layer extension section can realize that the protective layer extension section isolates the burrs at the corresponding ends of the end areas along the extension direction from the diaphragm.
  • At least one end region is located at one end of the pole piece along the length direction of the pole piece body, and the extension direction of the end region is the width direction of the pole piece body.
  • the electrode pole pieces in the wound electrode assembly are wound around an axis parallel to the width direction.
  • the end region is located at one end of the pole piece along the length direction of the pole piece body.
  • the extension direction of the end region is the width direction of the pole piece body.
  • the wound electrode assembly of the present disclosure has higher strength, which can reduce the collapse of the electrode assembly due to insufficient strength, thereby helping to further improve the wound electrode assembly and the wound electrode assembly having the same.
  • the pole piece is a positive pole piece or a negative pole piece.
  • the pole piece assembly When the pole piece assembly includes a positive electrode piece, it can be used as a substitute for the traditional positive electrode piece to make an electrode assembly. At this time, the protective layer can prevent the burrs of the positive electrode piece from piercing the separator. When the pole piece assembly includes a negative electrode piece, it can be used as a traditional negative electrode piece. At this time, the protective layer can prevent the burrs of the negative electrode piece from piercing the separator. Therefore, whether the electrode piece is a positive electrode piece or a negative electrode piece, it can improve the electrode assembly and battery cell including the electrode piece assembly. safety performance of the body, battery and electrical equipment.
  • a second aspect of the disclosure provides an electrode assembly, including the pole piece assembly of the first aspect of the disclosure.
  • the electrode assembly of the present disclosure has the advantages of the pole piece assembly of the present disclosure.
  • the electrode assembly is a wound electrode assembly, and the extending direction of the end region of the pole piece assembly is parallel to the axis of the wound electrode assembly.
  • the electrode assembly is a wound electrode assembly, and the extension direction of the end region of the pole piece assembly is set to be parallel to the axis of the wound electrode assembly, and the end region is located at the radially inner end or radially outer end of the wound electrode assembly.
  • the protective layer can also assume a certain supporting function for the electrode assembly.
  • the wound electrode assembly of the present disclosure has higher strength, which can reduce the phenomenon of collapse of the electrode assembly due to insufficient strength, thereby helping to further improve the performance of the wound electrode assembly and the battery cells and batteries having the wound electrode assembly. Safety performance.
  • a third aspect of the disclosure provides a battery cell, including the electrode assembly of the second aspect of the disclosure.
  • the battery cell of the present disclosure has the advantages of the electrode assembly of the present disclosure.
  • a fourth aspect of the disclosure provides a battery, including the battery cell of the third aspect of the disclosure.
  • the battery of the present disclosure has the advantages of the battery cell of the present disclosure.
  • a fifth aspect of the disclosure provides an electrical device, including the battery of the fourth aspect of the disclosure, and the battery is used to provide power to the electrical device.
  • the electrical equipment of the present disclosure has the advantages of the battery cells of the present disclosure.
  • Figure 1 is a schematic structural diagram of electrical equipment according to an embodiment of the present disclosure
  • Figure 2 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present disclosure
  • Figure 3 is a schematic exploded structural diagram of a battery cell according to an embodiment of the present disclosure.
  • Figure 4 is a schematic structural diagram of the pole piece assembly in a rolled state according to an embodiment of the present disclosure, in which the tabs of the pole pieces are not shown in order to clearly show the pole piece body and the positional relationship between the pole piece body and the protective layer;
  • Figure 5 is a schematic structural diagram of a pole piece assembly in a flat state according to an embodiment of the present disclosure
  • Figure 6 is an enlarged bottom view of Figure 5;
  • Figure 7 is an enlarged structural schematic diagram of part B of Figure 6;
  • Figure 8 is a schematic cross-sectional structural diagram enlarged along the line A-A of Figure 6;
  • Figure 9 is an enlarged structural schematic diagram of part C in Figure 8.
  • Figure 10 is a schematic structural diagram of an embodiment of an adhesive tape used to make a protective layer
  • Figure 11 is a schematic structural diagram of another embodiment of the tape used to make a protective layer
  • Figure 12 is a schematic structural diagram of another embodiment of the tape used to make a protective layer
  • Figure 13 is a schematic structural diagram of another embodiment of the tape used to make a protective layer
  • Figure 14 is a schematic structural diagram of another embodiment of the tape used to make the protective layer.
  • connection should be understood in a broad sense.
  • it can be a fixed connection or a removable connection.
  • the electrode assembly as the core component of the battery cell, will expand during the use of the battery.
  • the burrs in the end area of the pole piece will easily pierce the separator, which may cause the positive electrode piece and the The negative electrode piece is connected through burrs, which causes an internal short circuit in the battery, thereby causing a safety accident.
  • the present disclosure provides a pole piece assembly in which a protective layer is provided at the end region of the electrode body of the electrode, covering the main end face of the end region and the surface adjacent to the main end face, and the protective layer wraps the burrs in the end region , to prevent burrs from piercing the diaphragm, thereby preventing internal short circuits in the electrode body and improving the safety performance of the pole piece. Further, the present disclosure also provides an electrode assembly with the pole piece assembly, a battery cell with the electrode assembly, a battery with the battery cell, and an electrical device with the battery.
  • Embodiments of the present disclosure provide an electrical device that uses a battery as a power source, and the battery is configured to provide electric energy to the electrical device.
  • Electrical equipment can be, but is not limited to, mobile phones, portable devices, laptops, battery cars, electric cars, ships, spacecraft, electric toys and power tools, etc.
  • space vehicles include airplanes, rockets, space shuttles, and spacecrafts, among others.
  • Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.
  • Power tools include metal-cutting power tools, abrasive power tools, assembly power tools and railway power tools such as drills, power grinders, power wrenches, power screwdrivers, hammers, impact drills, concrete vibrators and planers.
  • the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of the present disclosure.
  • the battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present disclosure are not limited to this.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present disclosure are not limited to this.
  • the battery mentioned in the embodiments of the present disclosure refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this disclosure may include a battery module or a battery pack, or the like.
  • Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell mainly includes electrode components and electrolyte.
  • the electrode components mainly consist of positive electrode plates, negative electrode plates and separators. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work.
  • 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 cathode current collector that is not coated with the cathode active material layer protrudes from the cathode current collector that is coated with the cathode active material layer, and the cathode current collector that is uncoated with the cathode active material layer serves as the cathode tab.
  • the positive electrode current collector coated with the positive electrode active material layer and the positive electrode active material layer thereon constitute the main body of the positive electrode piece.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, 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 that is not coated with the negative electrode active material layer protrudes from the negative electrode current collector that is coated with the negative electrode active material layer, and the negative electrode current collector that is not coated with the negative electrode active material layer serves as the negative electrode tab.
  • the negative electrode current collector coated with the negative electrode active material layer and the negative electrode active material layer thereon constitute the main body of the negative electrode plate.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that large currents can pass through without melting, the number of positive electrode tabs is generally multiple and stacked together, and the number of negative electrode tabs is generally multiple and stacked together.
  • the material of the separator can be polypropylene (PP) or polyethylene (polyethylene, PE).
  • Figure 1 is a schematic structural diagram of a vehicle D provided by some embodiments of the present disclosure.
  • Vehicle D can be a fuel vehicle, a gas vehicle, or a new energy vehicle.
  • the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle.
  • Vehicle D is provided with battery B inside, and battery B can be placed at the bottom, head, or tail of vehicle D. Battery B may be used to power vehicle D, for example, as the operating power source of vehicle D.
  • battery B can not only be used as an operating power source of vehicle D, but also can be used as a driving power source of vehicle D, replacing or partially replacing fuel or natural gas to provide driving power for vehicle D.
  • Figure 2 is an exploded view of battery B provided by some embodiments of the present disclosure.
  • Battery B includes a case 1 and battery cells 20 accommodated in the case 1 .
  • the box body 1 includes a box shell 11 and a box cover 12 that is fastened to the box shell 11 .
  • the box body 1 is used to provide an accommodation space for the battery cells 20 .
  • the box 1 is a rectangular parallelepiped as a whole. In embodiments not shown in the figures, the box 1 can also be in other shapes, such as a cylinder.
  • battery B there are a plurality of battery cells 20 , and the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed manner.
  • Mixed connection means that multiple battery cells 20 are connected in series and in parallel.
  • the plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 is accommodated in the box 1 .
  • battery B may be composed of multiple battery cells 20 connected in series, parallel, or mixed to form a battery pack 2 .
  • the battery pack 2 may be in the form of a battery module.
  • a plurality of battery packs 2 are connected in series, parallel or mixed to form a whole, and are accommodated in the box 1 .
  • Battery B may also include other structures.
  • battery B may also include a bus component for realizing electrical connections between multiple battery cells 20 .
  • a battery cell mainly includes a battery core, a casing and an end cap assembly.
  • the battery core may include one or two or more electrode components.
  • the battery core is sealed in the accommodation space of the housing through the end cover of the end cover assembly, and the accommodation space is filled with electrolyte.
  • the electrode assembly is arranged in the accommodation space of the housing.
  • the electrode assembly is the component in the battery cell where electrochemical reactions occur.
  • the electrode assembly may be of a rolled structure.
  • the strip-shaped positive electrode piece, the separator and the negative electrode piece are stacked in sequence and wound more than two times to form an electrode assembly, and the electrode assembly can be in a flat shape.
  • the electrode assembly can be directly rolled into a flat shape, so that the electrode assembly has a roughly hexahedral structure, or it can be rolled into a hollow cylindrical structure first, and then flattened into a flat shape after being rolled.
  • the flat surface is approximately parallel to the winding axis and is the outer surface with the largest area.
  • a flat surface can be a relatively flat surface and does not need to be a pure plane.
  • the electrode assembly may also have a laminated structure, that is, the electrode assembly includes a plurality of positive electrode pieces and a plurality of negative electrode pieces, and the separator is disposed between the positive electrode piece and the negative electrode piece.
  • the positive electrode pieces and the negative electrode pieces are stacked.
  • the casing is a component used to provide an accommodation space for accommodating the electrode assembly, electrolyte, and other components therein.
  • the housing can be of various shapes and sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly.
  • the material of the shell can be selected from copper, iron, aluminum, stainless steel, aluminum alloy, plastic and other materials.
  • the end cap refers to a component that covers the opening of the casing to isolate the internal environment of the battery cell from the external environment.
  • the shape of the end cap can be adapted to the shape of the housing to fit the housing.
  • the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap is less likely to deform when subjected to extrusion and collision, allowing the battery cell to have higher structural strength. Safety features could also be improved.
  • Functional components such as electrode terminals can be provided on the end cap. The electrode terminal may be used to electrically connect with the electrode assembly for outputting or inputting electrical energy of the battery cell.
  • the end cap may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value.
  • the pressure relief mechanism is, for example, an explosion-proof valve.
  • the end cap can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not limited in the embodiments of the present disclosure.
  • the housing and the end cover may be independent components.
  • the housing is provided with an opening, and the end cover covers the opening at the opening to form an internal environment of the battery cell.
  • the end cover and the shell can also be integrated.
  • the end cover and the shell can form a common connection surface before other components are installed into the shell.
  • an insulating member may be provided inside the end cover, and the insulating member may be used to isolate the electrical connection components in the case from the end cover to reduce the risk of short circuit.
  • the insulating member may be an insulating plate, which may be made of plastic, rubber, or other materials.
  • FIG. 3 is an exploded structural diagram of a battery cell according to an embodiment of the present disclosure.
  • the battery cell 20 in the embodiment of the present disclosure includes an end cap assembly 21, a casing 22 and a battery core.
  • the battery core includes two electrode assemblies 24.
  • the end cap assembly 21 includes an end cap 211, a positive terminal 212, a negative terminal 213, an explosion-proof valve 214 and an insulating plate 215.
  • the end cap 211 is used to cooperate with the casing 22 to package the battery core in the sealed accommodation space formed by the end cap 211 and the casing 22 .
  • the positive terminal 212 and the negative terminal 213 can be electrically connected to the corresponding positive tab 242 and negative tab 243 of the electrode assembly 24 through the positive connecting piece 22 and the negative connecting piece 23 respectively.
  • the insulating plate 215 is arranged between the end cover 211 and the positive electrode connecting piece 22 and the negative electrode connecting piece 23 to achieve insulation between the end cover 211 and the positive electrode connecting piece 22 and the negative electrode connecting piece 23 as well as each electrode assembly 24 .
  • the electrode assembly 24 includes an electrode assembly body 241 , a positive electrode tab 242 and a negative electrode tab 243 . Electrode assembly 24 includes pole piece assembly 30 of an embodiment of the present disclosure.
  • the pole piece assembly 30 of the embodiment of the present disclosure will be described below with reference to FIGS. 4 to 13 .
  • the pole piece assembly 30 of the embodiment of the present disclosure includes a pole piece 31 and a protective layer 32 .
  • the pole piece 31 includes a pole piece body 311 having an end region 311A.
  • the protective layer 32 is fixed on the pole piece main body 311 and includes a protective layer main body section 321 covering the end region 311A along the extending direction of the end region 311A.
  • the protective layer main section 321 includes a main end surface main protection part 3211 and two side main body protection parts 3212 respectively connected to both sides of the main end surface main protection part 3211.
  • the main end surface body protection part 3211 covers the main end surface 3111A of the end region 311A, and the side body protection part 3212 extends from the main end surface 3111A of the end region 311A to the inside of the pole piece body 311 and covers the end region 311A close to the main end surface 3111A. Side 3111B.
  • the number of end regions 311A of the pole piece body 311 may be one, or two or more. As shown in the embodiment shown in FIGS. 4 to 9 , the pole piece body 311 includes two end regions 311A located at both ends of the pole piece body 311 in the length direction (the X direction in FIG. 5 ). The extension of the end region 311A The direction is consistent with the width direction of the pole piece body 311 (Y direction in FIG. 5).
  • the pole piece assembly 30 of the embodiment of the present disclosure is used in a secondary battery.
  • a protective layer 32 fixed on the pole piece body 311 is provided at the end region 311A of the pole piece 31 of the pole piece assembly 30.
  • the protective layer 32 includes an extension along the end region 311A. The direction covers the main end surface 321 of the end area 311A, and the main end surface main protection part 3211 and the two side main protection parts 3212 of the protective layer 32 can wrap the main end surface 3111A and the side surface 3111B of the end area 311A, thereby Isolating the burrs in the end region 311A of the electrode body 311 from the separator is beneficial to reducing the phenomenon of the burrs at the end region 311A piercing the separator, thereby helping to reduce the friction between the positive electrode body and the negative electrode body caused by the separator being punctured.
  • the internal short circuit between the pole piece assembly 30 and the safety performance of the electrode assembly, the battery cell, the battery and the electrical equipment is improved.
  • the maximum distance L1 between the edge E of the side body protection part 3212 located inside the main end surface 3111A of the end region 311A and the main end surface 3111A of the end region 311A is 2mm to 100mm.
  • the maximum distance L1 is, for example, 3 mm, 5 mm, 16 mm, 30 mm, 45 mm, 60 mm, 75 mm, 95 mm, etc.
  • the contact between the protective layer 32 and the side surface 3111B of the end region is ensured.
  • the area is reasonable to ensure the bonding strength of the protective layer 32 with the main end surface 3111A and the side surface 3111B of the end area 311A, and prevent the protective layer 32 from falling off partially or completely, affecting the protective effect.
  • the protective layer 32 can be limited to cover the end area.
  • the area of the side 3111B limits the battery capacity loss caused by the provision of the protective layer 32 .
  • the protective layer 32 includes an adhesive tape 320 adhered to the pole piece body 311 .
  • the protective layer 32 is made of adhesive tape 320.
  • the adhesive tape 320 itself is easy to prepare, and its shape and size are easy to meet the design requirements.
  • the adhesive tape 320 can be prepared before being assembled with the pole piece main body 311.
  • the adhesive tape 320 is easy to assemble with the pole piece main body 311.
  • the adhesive tape 320 is on the pole.
  • the assembly position on the main body 311 is also easy to control, and the processing efficiency of the pole piece assembly 30 is high, which has little impact on the manufacturing process of the electrode assembly.
  • the tape 320 can be made of polyethylene (PE) or polypropylene (PP) or other materials.
  • the protective layer can be formed in various ways.
  • the protective layer can also be directly fixed to the end region of the pole piece body from a strip-shaped sheet through glue coating or hot pressing, or the protective layer can be formed by coating a protective material on the end region of the pole piece body. .
  • the edge E of the two side body protection portions 3212 located inside the main end surface 3111A of the end region 311A is equal to the maximum distance L1 of the main end surface 3111A of the end region 311A.
  • the maximum distance L1 between the edge E of the two side body protection portions 3212 located inside the main end surface 3111A of the end region 311A and the main end surface 3111A of the end region 311A is set to be equal, which facilitates the two side body protection portions 3212 to be in contact with the end surface.
  • the contact area of the side surface 3111B of the end region 311A is within a reasonable range, so as to ensure the bonding strength of the protective layer 32 with the main end surface 3111A and the two side surfaces 3111B of the end region 311A at the same time, and the bonding strength of the protective layer 32 with the two side surfaces 3111B Close, it is less likely to cause unilateral detachment and the phenomenon that the protective layer 32 will gradually fall off due to unilateral detachment, which is beneficial to ensuring the protective effect of the protective layer 32, and is also conducive to making the two side body protective parts 3212 cover the sides of the end area 311A.
  • the area of 3111B is uniform, which reduces the situation where the area of side 3111B covering the end region 311A is too large, thereby reducing the impact of the protective layer 32 on the battery capacity.
  • the two side body protection portions 3212 are arranged symmetrically with respect to the thickness direction of the pole piece 31 (the Z direction in FIG. 8 ).
  • the two side body protection parts 3212 are arranged symmetrically with respect to the thickness direction of the pole piece 31, which is beneficial to the contact area between the two side body protection parts 3212 and the side surface 3111B of the end region being within a reasonable range and relatively consistent, which is beneficial to the protection layer 32 and
  • the main end surface 3111A of the end area and the two side surfaces 3111B have reasonable and close bonding strengths. Therefore, the bonding strength of the protective layer 32 and the two side surfaces 3111B is close. It is not easy for unilateral detachment to occur and the gradual protection caused by unilateral detachment.
  • the phenomenon of the entire layer 32 falling off is conducive to ensuring the protective effect of the protective layer 32, and is conducive to making the area of the two side body protective parts 3212 covering the side 3111B of the end region 311A consistent, reducing the problem of one side covering the side of the end region 311A.
  • the area of 3111B is too large, thereby reducing the impact of the protective layer 32 on the battery capacity.
  • the edge E of the side body protection part 3212 located inside the main end surface 3111A of the end region 311A is a straight edge; or the main end surface of the side body protection part 3212 located at the end region 311A
  • the edge E inside 3111A is a folded edge; or the edge E inside the main end surface 3111A of the end area 311A of the side body protection part 3212 is a curved edge; or the main end surface of the side body protection part 3212 is located in the end area 311A.
  • the edge E on the inside of 3111A is a combined edge including a straight edge and a curved edge.
  • FIGS. 10 to 14 different shapes of the tape 320 are shown that are applicable when the tape 320 is used as the material of the protective layer 32 to make the pole piece assembly 30 .
  • FIG. 10 shows the shape of the tape 320 used in manufacturing the pole piece assembly 30 of the embodiment shown in FIGS. 4 to 9 .
  • FIGS. 11 to 14 illustrate several different alternative embodiments of the tape 320 in the embodiment shown in FIGS. 4 to 10 .
  • the shape of the tape 320 is formed by two upper and lower contour lines 320A and two left and right contour lines 320B.
  • the two upper and lower contour lines 320A are arranged symmetrically up and down
  • the two left and right contour lines 320B are arranged symmetrically left and right.
  • the dotted lines in Figures 10 to 14 represent the intersections of the adhesive tape 320 after being pasted on the electrode body 311 and the main end surface 3111A, side surfaces 3111B and side end surfaces of the end region 311A and their extensions.
  • the transverse direction in Figures 10 to 14, that is, the left and right direction is consistent with the length direction of the electrode body 311 shown in Figures 4 to 9, that is, the X direction.
  • the direction in Figures 10 to 14 The longitudinal direction, that is, the up and down direction is consistent with the width direction of the electrode body 311 shown in Figures 4 to 9, that is, the Y direction.
  • the thickness direction (the direction perpendicular to the paper surface) of the tape 10 in Figures 10 to 14 is consistent with that in Figures 4 to 9.
  • the thickness direction of the electrode main body 311 shown in FIG. 9 that is, the Z direction is consistent.
  • Embodiments of different shapes of the side body protection portion 3212 will be described below with reference to different shapes of the tape 320 .
  • the middle tape section 3201 located between the transverse dotted lines on the upper and lower sides forms the protective layer main section 321 of the protective layer 32 after the tape 320 is assembled with the electrode body 311 .
  • the first middle tape portion 32011 on the middle tape section 3201 separated by two longitudinal dotted lines forms the main end surface body protection portion 3211 of the protective layer main section 321 of the protective layer 32 after the tape 320 is assembled with the electrode body 311 .
  • the two first outer tape portions 32012 on both sides of the first middle tape portion 32011 of the middle tape section 3201 constitute the two side body protection portions of the protective layer main section 321 of the protective layer 32 after the tape 320 is assembled with the electrode body 311. 3212.
  • the portions of the left and right edges 320B of the tape 320 between the upper and lower dotted lines form the inner side of the main end surface 3111A of the side body protection portion 3212 in the end region 311A after the tape 320 is assembled with the electrode body 311 .
  • the portion between the upper and lower dotted lines of the left and right edges 320B of the tape 320 is a straight edge. That is, after the adhesive tape 320 is assembled with the electrode body 311, the edge E of the side body protection portion 3212 located inside the main end surface 3111A of the end region 311A is a linear edge.
  • the portion between the upper and lower dotted lines of the left and right edges 320B of the tape 320 is a folded edge. That is, after the adhesive tape 320 is assembled with the electrode body 311, the edge E of the side body protection part 3212 located inside the main end surface 3111A of the end region 311A is a zigzag edge.
  • the polygonal edge includes a plurality of linear edges connected in sequence. In the embodiment shown in FIG. 11 , the number of linear edges included in the folded edge is six; in the embodiment shown in FIG. 13 , the number of linear edges included in the folded edge is two.
  • the portion between the upper and lower dotted lines of the left and right edges 320B of the tape 320 is a curved edge. That is, after the adhesive tape 320 is assembled with the electrode body 311, the edge E of the side body protection portion 3212 located inside the main end surface 3111A of the end region 311A is a curved edge.
  • the curved edge includes a plurality of convex curved edges connected in sequence. In the embodiment shown in FIG. 12 , the number of convex curved edges included in the curved edge is four.
  • the portion between the upper and lower dotted lines of the left and right edges 320B of the tape 320 is a combined edge including a linear edge and a curved edge. That is, after the tape 320 is assembled with the electrode body 311, the edge E of the side body protection part 3212 located inside the main end surface 3111A of the end region 311A is a combined edge including a linear edge and a curved edge.
  • the combined edge includes two linear edges located on the upper and lower sides and two sequentially connected convex curved edges located in the middle.
  • the edge E of the side body protection portion 3212 located inside the main end surface 3111A of the end region 311A is a straight edge, which facilitates the processing and manufacturing of the protective layer 32 and the pole piece assembly 30 , and also helps reduce the risk of damage to the protective layer 32 .
  • edge E located inside the main end surface 3111A of the end region 311A of the side body protective part 3212 as a folded edge, a curved edge, or a combined edge including a straight edge and a curved edge is beneficial to ensuring that the protective layer 32
  • the combined area with the pole piece body 311 ensures the bonding strength between the protective layer 32 and the pole piece body 311 while minimizing the area of the protective layer 32 covering the pole piece body 311 and reducing the impact of the protective layer 32 on the battery capacity. .
  • the side body protection part 3212 is rectangular; or the edge side of the side body protection part 3212 located inside the main end surface 3111A of the end region 311A includes At least one protruding portion protrudes toward a side away from the main end surface 3111A.
  • the side body protective portion 3212 in a rectangular shape facilitates the processing and manufacturing of the protective layer 32 and the pole piece assembly 30, and also helps reduce the risk of damage to the protective layer 32.
  • the impact of the protective layer 32 on the pole piece body 311 along the extension direction of the end region 311A The impact is more consistent.
  • At least one protruding portion protruding toward the side away from the main end surface 3111A can be provided on the edge side of the side body protection portion 3212 located inside the main end surface 3111A of the end region 311A, so that the protective layer 32 and the pole piece body can be ensured.
  • the combined area of 311 ensures the bonding strength between the protective layer 32 and the pole piece body 311 while minimizing the area of the protective layer 32 covering the pole piece body 311 and reducing the impact of the protective layer 32 on the battery capacity.
  • the first outer tape portion 32012 corresponding to the side body protective portion 3212 is rectangular. That is, after the adhesive tape 320 and the electrode body 311 are assembled, the side body protection portion 3212 is rectangular.
  • the first outer tape portion 32012 corresponding to the side body protection portion 3212 includes at least one protruding portion 3201A protruding from the longitudinal dotted line to the transverse outer side. That is, after the tape 320 is assembled with the electrode body 311, at least one protrusion protruding toward a side away from the main end surface 3111A is provided on the edge side of the side body protection portion 3212 located inside the main end surface 3111A of the end region 311A.
  • each side body protection part 3212 is provided with three protruding parts.
  • each side body protection part 3212 is provided with four corresponding protrusions.
  • each side body protection part 3212 is provided with a protruding part.
  • each side body protection part 3212 is provided with two protruding parts.
  • the edge of the protruding side of the protruding portion 3201A is a folded edge or a curved edge.
  • edge of the protruding side of the protruding portion 3201A as a folded edge or a curved edge can ensure the bonding area of the protective layer 32 and the pole piece main body 311, thereby ensuring the bonding strength of the protective layer 32 and the pole piece body 311. At the same time, the area of the protective layer 32 covering the pole piece body 311 is minimized, and the impact of the protective layer 32 on the battery capacity is reduced.
  • the edge on the protruding side of the protruding portion 3201A included in the first outer tape portion 32012 corresponding to the side body protection portion 3212 is a folded edge. That is, after the adhesive tape 320 is assembled with the electrode body 311, the edge on the protruding side of the protruding portion of the side body protection portion 3212 is a folded edge.
  • the polygonal edge of each protrusion may include two, three or more straight edges.
  • the edge on the protruding side of the protruding portion 3201A included in the first outer tape portion 32012 corresponding to the side body protective portion 3212 is a curved edge. That is, after the adhesive tape 320 is assembled with the electrode body 311, the edge of the protruding side of the protruding portion of the side body protection portion 3212 is a curved edge.
  • the shape of the curved edge of each protrusion may be, for example, arc, parabola or hyperbola.
  • the side body guard 3212 includes a plurality of protrusions connected in series along the extension direction of the end region 311A.
  • edge of the protruding side of the protruding part as a folded edge or a curved edge can ensure the bonding area of the protective layer 32 and the pole piece body 311 and thus the bonding strength of the protective layer 32 and the pole piece body 311. , minimize the area of the protective layer 32 covering the main body of the pole piece, and reduce the impact of the protective layer on the battery capacity.
  • each side body protection part 3212 is provided with three sequentially connected protruding parts with folded edges.
  • each side body protection part 3212 is provided with four protruding parts with curved edges connected in sequence.
  • each side body protection part 3212 is provided with two protruding parts with curved edges connected in series.
  • At least a portion of at least two of the plurality of protrusions of the side body guard 3212 have the same shape and size.
  • At least a portion of at least two protruding portions 3201A of the plurality of protruding portions 3201A of the first outer tape portion 32012 of the tape 320 has the same shape and size. Therefore, the first outer tape portion has the same shape and size. At least a part of at least two of the plurality of protrusions of the side body protection part 3212 formed by the part 32012 has the same shape and size.
  • edge of the protruding side of the protruding part as a folded edge or a curved edge can ensure the bonding area of the protective layer 32 and the pole piece body 311 and thus the bonding strength of the protective layer 32 and the pole piece body 311. , minimize the area of the protective layer 32 covering the main body of the pole piece, and reduce the impact of the protective layer on the battery capacity.
  • the side body protection part 3212 although the embodiment in which the protective layer 32 is made of tape 320 is taken as an example in conjunction with FIGS. 10 to 14, the graphics shown in FIGS. 10 to 14 can also be seen.
  • the expanded pattern of the protective layer 32 is formed by other methods, such as pasting or hot-pressing strip materials, or coating protective materials. Therefore, the above description of the side body protective portion 3212 is also applicable to the protective layer formed by other methods.
  • Protective layer 32 is also applicable to the protective layer formed by other methods.
  • the main end surface body protective portion 3211 is fit and connected to the main end surface 3111A of the end region 311A of the pole piece 31 ; the side body protective portion 3212 is connected to the end surface 3111A of the pole piece 31 .
  • the side surfaces 3111B of the inner region 311A close to the main end surface 3111A are attached and connected.
  • the main end surface body protective part 3211 is attached and connected to the main end surface 3111A of the end region 311A of the pole piece 31 , and the side body protective part 3212 is attached and connected to the side 3111B of the end region 311A close to the main end surface 3111A to increase the protective layer.
  • the combined area of 32 and the end region 311A is conducive to reducing the size of the protective layer 32 on the basis of satisfying the bonding strength of the protective layer 32 and the pole piece 31, which can reduce the space occupied by the protective layer 32 and save the material of the protective layer 32.
  • the protective layer 32 and the corresponding surface of the pole piece body 311 can be adhered and connected by means such as bonding, hot pressing, or coating.
  • the cross section of the protective layer main section 321 perpendicular to the extension direction of the end region 311A forms a U shape.
  • Each surface of the protective layer main section 321 facing the electrode main body 311 is combined with the electrode main body 311 .
  • the protective layer 32 further includes a protective layer extension section 322 connected to an end of the protective layer main section 321 along the extension direction of the end region 311A. .
  • the protective layer extension section 322 is located outside the end region 311A along the extension direction of the end region 311A, and at least one end of the protective layer main section 321 along the extension direction of the end region 311A is connected to the protective layer extension section 322 .
  • Providing the protective layer extension section 322 can protect the end with the protective layer extension section 322 in the extension direction of the end region 311A, preventing burrs at this end from piercing the diaphragm, which is beneficial to further reducing burr penetration near the end region 311A.
  • the phenomenon of the separator can further reduce the internal short circuit of the positive electrode plate body and the negative electrode plate body caused by the puncture of the separator, and improve the safety performance of the electrode assembly, battery cells, batteries and electrical equipment including the electrode assembly 30 .
  • the length L2 of the protective layer extension section 322 along the extending direction of the end region 311A is less than or equal to 20 mm.
  • the length L2 may be, for example, 3mm, 6mm, 8mm, 15mm or 18mm.
  • Setting the length L2 of the protective layer extension section 322 to less than or equal to 20 mm can protect the end with the protective layer extension section 322 in the extension direction of the end region 311A while preventing further damage to the pole piece assembly 30 .
  • additional local stress is generated on the pole piece 31 due to contact with the protective layer extension 322 to prevent the pole piece 31 from being deformed. Lithium precipitation and other risks.
  • two protective layer extension sections 322 are respectively connected to both ends of the protective layer main section 321 , and the two protective layer extensions
  • the lengths L2 of segments 322 are equal.
  • Providing protective layer extension sections 322 at both ends of the protective layer main section 321 can protect both ends of the end region 311A in the extending direction, preventing burrs at both ends of the end region 311A from piercing the diaphragm, which is conducive to further reducing the number of ends.
  • the phenomenon that the burrs at the inner region 311A pierce the separator is conducive to further reducing the internal short circuit of the positive electrode plate body and the negative electrode plate body caused by the separator being punctured, and improving the electrode assembly including the electrode assembly 30, the battery cell, and the battery. and safety performance of electrical equipment.
  • Making the lengths L2 of the two protective layer extension sections 322 equal is conducive to setting the lengths L2 of the protective layer extension sections 322 at both ends to appropriate lengths, which is conducive to effective protection of both ends of the end region 311A in the extension direction, and also It is beneficial to prevent the improper length of the single-end protective layer extension section 322 from causing additional local stress on the pole piece 31 due to the force exerted by the end protection layer extension section 322, and to prevent risks such as lithium precipitation caused by deformation of the pole piece 31.
  • the protective layer extension section 322 includes a main end surface extending protective portion 3221 toward the extended surface of the main end surface 3111A of the end region 311A and a main end surface extending protective portion 3221 toward the end region 311A.
  • a side extension guard 3222 extends from the extended surface of side 3111B of side 311A.
  • Arranging the protective layer extension section 322 to include a main end surface extension protection part 3221 and a side extension protection part 3222 facilitates the protective layer extension section 322 and the protective layer main section 321 to have the same structural form.
  • a strip material such as tape 320
  • the protective layer extension section 322 can be formed together with the protective layer main section 321 without special design or processing, which can improve the processing efficiency of the pole piece assembly 30 .
  • each dotted line represents each intersection line of the tape 320 after being pasted on the electrode body 311 and the main end surface 3111A, the side surface 3111B and the side end surface of the end region 311A, and their extended portions.
  • the tape 320 and the electrode body 311 form the protective layer 32 after assembly.
  • the middle tape section 3201 located between the transverse dotted lines on the upper and lower sides forms the protective layer main section 321 of the protective layer 32 after the tape 320 and the electrode body 311 are assembled. Further, as shown in FIGS.
  • the end tape sections 3202 located on the upper and lower sides of the middle tape section 3201 form the protective layer extension section 321 of the protective layer 32 after the tape 320 is assembled with the electrode body 311 .
  • the second middle tape portion 32021 in the transverse middle of each end tape section 3202 forms the main end surface extension protection portion 3211 of the protective layer extension section 321 after the tape 320 is assembled with the electrode body 311 .
  • the two second outer tape portions 32022 on both lateral sides of the second middle tape portion 32021 of each end tape section 3202 form the side extending protective portions 3222 of the protective layer extension section 321 after the tape 320 is assembled with the electrode body 311 .
  • the protective layer extension section 322 includes a side end surface protective portion covering the side end surface 3111C of the end region 311A along the extension direction of the end region 311A.
  • the protective layer extension section 322 is configured to include a side end surface protective portion covering the side end surface 3111C of the end region 311A along the extension direction of the end region 311A, and can protect the space between the side end surface 3111C along the extension direction of the end region 311A and the membrane. For better isolation.
  • the above structural forms of the protective layer extension section 322 can realize that the protective layer extension section 322 can isolate the burrs and diaphragms at the corresponding ends of the end region 311A along the extension direction.
  • At least one end region 311A is located at one end of the pole piece 31 along the length direction X of the pole piece body 311 , and the end region 311A extends in the direction is the width direction Y of the pole piece body 311.
  • the electrode pole pieces in the wound electrode assembly are wound around an axis parallel to the width direction.
  • the end region 311A is located at one end of the pole piece 31 along the length direction
  • the end area 311A is located at the radially inner end or the radially outer end of the wound electrode assembly.
  • the protective layer 32 can also bear certain responsibilities for the electrode assembly.
  • the supporting function is that compared with the wound electrode assembly without a protective layer, the wound electrode assembly of the embodiment of the present disclosure has higher strength, which can reduce the collapse of the electrode assembly due to insufficient strength, thereby helping to further improve the rollability of the electrode assembly.
  • the two end regions 311A are respectively located at both ends of the pole piece 31 along the length direction Layer 32.
  • the extending direction of the end region 311A is the width direction Y of the pole piece body 311 . That is, the protective layer 32 extends along the extending direction of the end region 311A, and protrudes a certain distance outward from the two side end surfaces of the end region 311A along the extending direction.
  • the pole piece 31 is a positive pole piece or a negative pole piece.
  • the pole piece 31 can be a positive pole piece or a negative pole piece.
  • the pole piece assembly 30 forms a positive pole piece assembly, which can participate in the production of the electrode assembly instead of a conventional positive pole piece that does not include a protective layer.
  • the pole piece assembly 30 is formed into a negative pole piece assembly, which can participate in the production of the electrode assembly instead of a conventional negative pole piece that does not include a protective layer.
  • the pole piece body 311 includes a current collector of the pole piece 31 coated with an active material layer and an active material layer thereon.
  • the pole piece main body 311 includes the positive electrode current collector coated with the positive electrode active material layer of the pole piece 31 and the positive electrode active material layer thereon;
  • the pole piece main body 311 It includes the negative electrode current collector coated with the negative electrode active material layer of the pole piece 31 and the negative electrode active material layer thereon.
  • the pole piece 31 also includes a pole tab 312 connected to the current collector of the pole piece body 311 . There are multiple tabs 312 , and only one tab 312 is shown in FIG. 5 .
  • the pole piece body 311 serves as a component of the electrode assembly body 241 of the electrode assembly 24 shown in Figure 3.
  • the two pole tabs 312 overlap to form a positive pole tab 242 (when the pole piece 31 is a positive pole piece) or a negative pole tab 243 (when the pole piece 31 is a negative pole piece) shown in FIG. 3 .
  • the pole piece assembly 30 When the pole piece assembly 30 includes a positive electrode piece, it can be used as a substitute for a traditional positive electrode piece to make an electrode assembly. At this time, the protective layer can prevent the burrs of the positive electrode piece from piercing the separator. When the pole piece assembly 30 includes a negative electrode piece, it can be used as a traditional negative electrode. The electrode assembly is made as a substitute for the pole piece. At this time, the protective layer can prevent the burrs of the negative pole piece from piercing the separator. Therefore, whether the pole piece is a positive pole piece or a negative pole piece, the electrode assembly including the pole piece assembly 30 can be improved. , the safety performance of battery cells, batteries and electrical equipment.
  • An embodiment of the present disclosure also provides an electrode assembly, including the pole piece assembly 30 of the embodiment of the present disclosure.
  • the electrode assembly of the disclosed embodiment has the advantages of the pole piece assembly 30 of the disclosed embodiment.
  • the electrode assembly is, for example, the wound electrode assembly 24 shown in FIG. 3 .
  • the electrode assembly is a wound electrode assembly, and the extending direction of the end region 311A of the pole piece assembly 30 is parallel to the axis of the wound electrode assembly.
  • the winding manner of the pole piece assembly 30 shown in FIG. 4 corresponds to the winding manner of the pole piece assembly 30 in the electrode assembly described in this embodiment.
  • the electrode assembly is a wound electrode assembly.
  • the extension direction of the end region 311A of the pole piece assembly 30 is set parallel to the axis of the wound electrode assembly.
  • the end region 311A is located at the radially inner end of the wound electrode assembly or At the radially outer end, in addition to the function of preventing burrs from puncturing the diaphragm, the protective layer 32 can also assume a certain supporting function for the electrode assembly.
  • the wound electrode assembly according to the embodiments of the present disclosure has higher strength, which can reduce the collapse of the electrode assembly due to insufficient strength, thereby helping to further improve the wound electrode assembly and the performance of the wound electrode assembly. Safety performance of battery cells and batteries.
  • the pole piece assembly 30 of the embodiment of the present disclosure can also be applied to the stacked electrode assembly.
  • the pole piece assembly 30 is similar to the application of the pole piece assembly 30 in a wound electrode assembly. Since the main end surface 3111A of the end region 311A of the pole piece body 311 of the pole piece assembly 30 and the adjacent The surface is wrapped by the protective layer 32, and the burrs on the main end surface of the end region 311A and adjacent surfaces cannot easily penetrate the diaphragm.
  • An embodiment of the present disclosure also provides a battery cell, including the electrode assembly of the embodiment of the present disclosure.
  • the structure of the battery cell is, for example, the battery cell 20 shown in FIG. 3 .
  • the electrode assembly 24 of the battery cell 20 is a wound electrode assembly including a pole piece assembly 30 .
  • the positive electrode piece of the electrode assembly 24 is provided with a protective layer to form the electrode piece assembly 30 .
  • the battery cell of the embodiment of the present disclosure has the advantages of the electrode assembly of the embodiment of the present disclosure.
  • An embodiment of the present disclosure also provides a battery, including the battery cell of the embodiment of the present disclosure.
  • the battery configuration is, for example, battery B shown in Figure 2 .
  • Battery B includes a plurality of battery cells 20 shown in FIG. 3 .
  • the battery of the embodiment of the present disclosure has the advantages of the battery cell of the present disclosure.
  • An embodiment of the present disclosure also provides an electrical device, including the battery of the embodiment of the present disclosure, and the battery is used to provide power for the electrical device.
  • the electrical equipment is, for example, the vehicle D shown in FIG. 1 .
  • Vehicle D includes battery B shown in FIG. 2 .
  • battery B shown in FIG. 2 .
  • FIG. 2 For other structures of battery B, please refer to the previous relevant descriptions.
  • the electrical equipment according to the embodiments of the present disclosure has the advantages of the battery cells according to the embodiments of the present disclosure.
  • the electrode assembly 30 of the embodiment of the present disclosure will be further described below with reference to FIGS. 4 to 14 .
  • the pole piece assembly 30 includes a pole piece 31 and a protective layer 32 .
  • the pole piece 31 includes a pole piece main body 311 and a plurality of pole tabs 312 connected to the pole piece main body 311.
  • the pole tabs 312 are not shown in Figure 4. Only one tab 312 is shown schematically in 5 .
  • Each of the two ends along the length direction X of the pole piece body 311 has an end region 311A.
  • the extending directions of both end regions 311A are the same as the width direction Y of the pole piece main body 311 .
  • Each end region 311A of the pole piece body 311 is provided with a protective layer 32 .
  • Each protective layer 32 is made by pasting the adhesive tape 320 shown in FIG. 10 on the end region 311A of the pole piece body 311 .
  • the tape 320 is made of polyethylene as the main body.
  • Each protective layer 32 includes a protective layer main section 321 covering the end region 311A along the extension direction of the corresponding end region 311A and two protective layer extension sections 322 respectively connected to both ends of the protective layer main section 321 .
  • the protective layer main section 321 is composed of the middle tape section 3201 of the tape 320 shown in FIG. 10 ;
  • the protective layer extension section 322 is composed of the end tape section 3202 of the tape 320 shown in FIG. 10 .
  • the protective layer main section 321 includes a main end surface main protection part 3211 and two side main body protection parts 3212 respectively connected to both sides of the main end surface main protection part 3211.
  • the main end surface body protection part 3211 covers the main end surface 3111A of the end area 311A.
  • the side body protection part 3212 extends from the main end surface 3111A of the end region 311A toward the inside of the pole piece body 311 and covers the side surface 3111B of the end region 311A close to the main end surface 3111A.
  • the main end surface body protection part 3211 is composed of the first middle tape part 32011 of the middle tape section 3201 shown in FIG. 10
  • the side body protection part 3212 is composed of the first outer tape part 32012 shown in FIG. 10 .
  • the cross section of the protective layer main section 321 perpendicular to the extending direction of the end region 311A forms a U shape.
  • the protective layer extension section 322 includes a main end surface extending protection portion 3221 toward an extending surface of the main end surface 3111A of the end region 311A and a side extending protection portion toward an extending surface of the side surface 3111B of the end region 311A.
  • Department 3222 the main end surface extended protection part 3221 is composed of the second middle tape part 32021 of the end tape section 3202 of the tape 320 shown in FIG. 10
  • the side extended protection part 3222 is composed of the end tape section 3202 of the tape 320 shown in FIG. 10
  • the second outer tape portion 32022 is composed of.
  • the protective layer extension section 322 and the protective layer main section 321 have the same cross-sectional shape perpendicular to the extension direction of the end region 311A, and also form a U shape.
  • the edge E of the two side body protection portions 3212 located inside the main end surface 3111A of the end region 311A is equal to the maximum distance L1 of the main end surface 3111A of the end region 311A.
  • the two side body protection parts 3212 are arranged symmetrically with respect to the thickness direction Z of the pole piece 31 .
  • the maximum distance L1 between the edge E located inside the main end surface 3111A of the end region 311A and the main end surface 3111A of the end region 311A is 20 mm.
  • the left and right edges 320B of the tape 320 are linear edges. Therefore, after the adhesive tape 320 is assembled with the electrode body 311, the edge E of the side body protection part 3212 located inside the main end surface 3111A of the end region 311A is a linear edge. Furthermore, as shown in FIGS. 4 to 10 , the first outer tape portion 32012 corresponding to the side body protective portion 3212 is rectangular. Therefore, after the adhesive tape 320 is assembled with the electrode body 311, the side body protection portion 3212 has a rectangular shape.
  • the lengths L2 of the two protective layer extension sections 322 are equal.
  • the length L2 of the protective layer extension section 322 is equal to 10 mm.
  • Figure 11 is an alternative embodiment to the embodiment shown in Figure 10.
  • Each first outer tape portion 32012 includes three protruding portions 3201A.
  • the protruding side edge of each protruding portion 3201A is a folded edge, and the shape of each protruding portion 3201A is a triangle.
  • the side edge of the side body protection portion 3212 of the pole piece assembly 30 away from the main end surface 3111A is a folded edge including six straight edges. .
  • Figure 12 is another alternative embodiment to the embodiment shown in Figure 10.
  • Each first outer tape portion 32012 includes four protruding portions 3201A, and the protruding side edge of each protruding portion 3201A is a curved edge.
  • the shape of each protruding portion 3201A is semicircular.
  • the side edge of the side body protection portion 3212 of the pole piece assembly 30 away from the main end surface 3111A is a curve including four convex curved edges. type edge.
  • Figure 13 is another alternative embodiment to the embodiment shown in Figure 10.
  • Each first outer tape portion 32012 includes a protruding portion 3201A, and the protruding side edge of each protruding portion 3201A is a folded edge.
  • the shape of each protruding portion 3201A is triangular.
  • the side edge of the side body protection portion 3212 of the pole piece assembly 30 away from the main end surface 3111A is a folded edge including two straight edges. .
  • Figure 14 is another alternative embodiment to the embodiment shown in Figure 10.
  • each of the first outer tape portions 32012 includes two protruding portions 3201A.
  • the protruding side edge of each protruding portion 3201A is a curved edge, and the two sides of the protruding portion 201A in the up and down direction are linear edges.
  • the shape of each protruding portion 3201A is semicircular.
  • the side edge of the side body protection portion 3212 of the pole piece assembly 30 away from the main end surface 3111A includes two widths located at the electrode pole piece 311 The linear edges on both sides of the electrode pole piece 311 and the two convex curved edges located in the middle of the width direction of the electrode pole piece 311 are combined edges.
  • the edge shape can be in other forms.
  • the shape of the protrusion corresponding to the folded edge can also be a trapezoid, combined with a curved edge or a combination.
  • the shape of the protruding portion corresponding to the edge of the mold may also be a semi-elliptical shape, etc.

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Abstract

本公开提供一种极片组件、电极组件、电池单体、电池和用电设备。极片组件包括极片和防护层。极片包括极片主体，极片主体具有端部区域。防护层固定于极片主体上，包括沿端部区域的延伸方向覆盖端部区域的防护层主体段。防护层主体段包括主端面主体防护部和分别连接于主端面主体防护部的两侧的两个侧面主体防护部。主端面主体防护部覆盖端部区域的主端面，侧面主体防护部从端部区域的主端面向极片主体的内侧延伸并覆盖端部区域的靠近主端面的侧面。

Description

极片组件、电极组件、电池单体、电池和用电设备 技术领域
本公开涉及电池技术领域，特别是涉及一种极片组件、电极组件、电池单体、电池和用电设备。
背景技术
在电池领域内，电池的极片在极片及电极组件的生产、加工的过程中其端部区域可能会产生毛刺。例如，生产卷绕式电极组件时，正极极片、负极极片和隔膜按预定次序层叠后在卷绕设备上连续卷绕至合适的大小，然后通过卷绕设备上的切刀切断正极极片、负极极片和隔膜，卷绕后的正极极片、负极极片和隔膜形成电极组件，正极极片或负极极片的主端面附近就易产生毛刺。具有端部区域具有毛刺的极片或电极组件的电池单体在使用过程中会发生膨胀，随之而来的是在正极极片和负极极片的具有毛刺的相应端部区域附近易发生内部短路。
发明内容
本公开旨在提供一种不易引发电池单体内部短路的极片组件、电极组件、电池单体、电池和用电设备。
本公开第一方面提供一种极片组件，包括极片和防护层。极片包括极片主体，极片主体具有端部区域。防护层固定于极片主体上，包括沿端部区域的延伸方向覆盖端部区域的防护层主体段。防护层主体段包括主端面主体防护部和分别连接于主端面主体防护部的两侧的两个侧面主体防护部。主端面主体防护部覆盖端部区域的主端面，侧面主体防护部从端部区域的主端面向极片主体的内侧延伸并覆盖端部区域的靠近主端面的侧面。
在本公开的极片组件中，在极片组件的极片的端部区域处设置固定于极片主体上的防护层，防护层包括沿端部区域的延伸方向覆盖端部区域的防护层主体段，该防护层32的主端面主体防护部3211和两个侧面主体防护部3212可以将端部区域的主端面和侧面包裹起来，从而将极片主体的端部区域的毛刺与隔膜隔离，利于减少端部区域处的毛刺刺穿隔膜的现象，从而利于减少隔膜被刺穿引发的正极极片主体和负极极片主体之间的内部短路，提高包括该极片组件的电极组件、电池单体、电池和用电设备的安全性能。
在一些实施例的极片组件中，侧面主体防护部的位于端部区域的主端面内侧的边缘与端部区域的主端面的最大距离为2mm至100mm。
合理设置侧面主体防护部的位于端部区域的主端面内侧的边缘与端部区域的主端面的最大距离，一方面使防护层与端部区域的侧面的接触面积合理，以利于保证防护层与端部区域的主端面和侧面结合强度，防止防护层部分或全部脱落，影响防护效果，另一方面，可以限制防护层覆盖端部区域的侧面的面积，限制因设置防护层引起的电池容量损失。
在一些实施例的极片组件中，防护层包括粘贴于极片主体的胶带。
采用胶带制作防护层，胶带本身易于制备，形状和尺寸易于满足设计要求，可在与极片主体组装前制备好胶带，胶带易于与极片主体组装，胶带在极片主体上的组装位置也易于控制，极片组件的加工效率较高，对电极组件的制作过程影响较小。
在一些实施例的极片组件中，两个侧面主体防护部的位于端部区域的主端面内侧的边缘与端部区域的主端面的最大距离相等。
两个侧面主体防护部的位于端部区域的主端面内侧的边缘与端部区域的主端面的最大距离设置为相等，利于两个侧面主体防护部均能与端部区域的侧面的接触面积处于合理范围，以利于同时保证防护层与端部区域的主端面和两个侧面的结合强度，而防护层与两个侧面的结合强度接近，不易出现单侧脱离的现象及因单侧脱离逐渐引起防护层整体脱落的现象而利于保证防护层的防护效果，也利于使两个侧面主体防护部覆盖端部区域的侧面的面积均一，减小因单侧覆盖端部区域的侧面的面积过大的情况，从而减小设置防护层对电池容量的影响。
在一些实施例的极片组件中，两个侧面主体防护部相对于极片的厚度方向对称设置。
两个侧面主体防护部相对于极片的厚度方向对称设置，利于两个侧面主体防护部与端部区域的侧面的接触面积均处于合理范围并较为一致，以利于防护层与端部区域的主端面和两个侧面的结合强度合理且结合强度接近，而防护层与两个侧面的结合强度接近，不易出现单侧脱离的现象及因单侧脱离逐渐引起防护层整体脱落的现象而利于保证防护层的防护效果，且利于使两个侧面主体防护部覆盖端部区域的侧面的面积一致，减小因单侧覆盖端部区域的侧面的面积过大的情况，从而减小设置防护层对电池容量的影响。
在一些实施例的极片组件中，侧面主体防护部的位于端部区域的主端面内侧的边缘为直线型边缘；或侧面主体防护部的位于端部区域的主端面内侧的边缘为折线型边 缘；或侧面主体防护部的位于端部区域的主端面内侧的边缘为曲线型边缘；或侧面主体防护部的位于端部区域的主端面内侧的边缘为包括直线型边缘和曲线型边缘的组合型边缘。
侧面主体防护部的位于端部区域的主端面内侧的边缘为直线型边缘利于防护层及极片组件加工制造，也利于降低防护层的损坏风险。而将侧面主体防护部的位于端部区域的主端面内侧的边缘设置为折线型边缘、曲线型边缘或包括直线型边缘和曲线型边缘的组合型边缘，利于在保证防护层与极片主体的结合面积从而保证防护层与极片主体的结合强度的同时，最大限度减小防护层覆盖极片主体的面积，减小设置防护层对电池容量的影响。
在一些实施例的极片组件中，侧面主体防护部为长方形；或侧面主体防护部的位于端部区域的主端面内侧的边缘一侧包括向远离主端面的一侧凸出的至少一个凸出部。
将侧面主体防护部设置为长方形，利于防护层及极片组件加工制造，也利于降低防护层的损坏风险，沿端部区域的延伸方向防护层对极片主体产生的影响更加一致。在侧面主体防护部的位于端部区域的主端面内侧的边缘一侧设置向远离主端面的一侧凸出的至少一个凸出部，则可以在保证防护层与极片主体的结合面积从而保证防护层与极片主体的结合强度的同时，最大限度减小防护层覆盖极片主体的面积，减小设置防护层对电池容量的影响。
在一些实施例的极片组件中，凸出部的凸出侧的边缘为折线型边缘或曲线型边缘。
将凸出部的凸出侧的边缘设置为折线型边缘或曲线型边缘，均可以实现在保证防护层与极片主体的结合面积从而保证防护层与极片主体的结合强度的同时，最大限度减小防护层覆盖极片主体的面积，减小设置防护层对电池容量的影响。
在一些实施例的极片组件中，侧面主体防护部包括沿端部区域的延伸方向顺次连接的多个凸出部。
将凸出部的凸出侧的边缘设置为折线型边缘或曲线型边缘，可以实现在保证防护层与极片主体的结合面积从而保证防护层与极片主体的结合强度的同时，最大限度减小防护层覆盖极片主体的面积，减小设置防护层对电池容量的影响。
在一些实施例的极片组件中，多个凸出部中至少两个凸出部的至少一部分的形状和尺寸相同。
将凸出部的凸出侧的边缘设置为折线型边缘或曲线型边缘，可以实现在保证防护层与极片主体的结合面积从而保证防护层与极片主体的结合强度的同时，最大限度减小 防护层覆盖极片主体的面积，减小设置防护层对电池容量的影响。
在一些实施例的极片组件中，主端面主体防护部与极片的端部区域的主端面贴合并连接；侧面主体防护部与端部区域的靠近主端面的侧面贴合并连接。
使主端面主体防护部与极片的端部区域的主端面贴合并连接，使侧面主体防护部与端部区域的靠近主端面的侧面贴合并连接，可以减少防护层占用的空间，增加防护层与端部区域的结合面积，利于在满足防护层与极片的结合强度的基础上减小防护层的大小，节约防护层的材料。
在一些实施例的极片组件中，防护层还包括与防护层主体段的沿端部区域的延伸方向的端部连接的防护层延伸段。
设置防护层延伸段可以对端部区域的延伸方向的具有防护层延伸段的端部进行防护，防止该端部的毛刺刺穿隔膜，利于进一步减少端部区域处的毛刺刺穿隔膜的现象，从而利于进一步减少隔膜被刺穿引发的正极极片主体和负极极片主体内部短路，提高包括该极片组件的电极组件、电池单体、电池和用电设备的安全性能。
在一些实施例的极片组件中，沿端部区域的延伸方向，防护层延伸段的长度小于或等于20mm。
将防护层延伸段的长度设置为小于或等于20mm，可以在对端部区域的延伸方向的具有防护层延伸段的端部进行防护的同时，防止因对极片组件进行进一步加工或对极片组件所在的电极组件或电池单体进行组装的过程中因触碰防护层延伸段而使极片产生附加的局部受力，防止极片因此而变形所引发的析锂等风险。
在一些实施例的极片组件中，沿端部区域的延伸方向，两个防护层延伸段分别连接于防护层主体段的两端，两个防护层延伸段的长度相等。
在防护层主体段的两端均设置防护层延伸段可以对端部区域的延伸方向的两端部均进行防护，防止端部区域的两端的毛刺刺穿隔膜，利于进一步减少端部区域处的毛刺刺穿隔膜的现象，从而利于进一步减少隔膜被刺穿引发的正极极片主体和负极极片主体内部短路，提高包括该极片组件的电极组件、电池单体、电池和用电设备的安全性能。使两个防护层延伸段的长度相等，利于将两端的防护层延伸段的长度均设置为适当的长度，利于对端部区域的延伸方向的两端均进行有效防护，也利于防止单端防护层延伸段长度不当而使极片因该端防护层延伸段受力而产生附加的局部受力，防止极片因此而变形所引发的析锂等风险。
在一些实施例的极片组件中，防护层延伸段包括朝向端部区域的主端面的延伸表面的主端面延伸防护部和朝向端部区域的侧面的延伸表面的侧面延伸防护部；和/或防护 层延伸段包括覆盖端部区域的沿端部区域的延伸方向的侧端面的侧端面防护部。
以上防护层延伸段的结构形式均能实现防护层延伸段对端部区域的沿延伸方向的相应端部的毛刺与隔膜进行隔离。
在一些实施例的极片组件中，至少一个端部区域位于极片的沿极片主体的长度方向的一端，端部区域的延伸方向为极片主体的宽度方向。
一般情况下，卷绕式电极组件中的电极极片绕与宽度方向平行的轴线卷绕。端部区域位于极片的沿极片主体的长度方向的一端，端部区域的延伸方向为极片主体的宽度方向，极片组件作为卷绕式电极组件中的电极极片时，端部区域位于卷绕式电极组件的径向内端或径向外端，此时防护层除承担防止毛刺刺破隔膜的功能外，还可以对电极组件承担一定的支撑功能，相比于无防护层的卷绕式电极组件而言，本公开的卷绕式电极组件的强度更高，可减少电极组件因强度不足发生塌陷的现象，从而利于进一步提高卷绕式电极组件及具有该卷绕式电极组件的电池单体和电池的安全性能。
在一些实施例的极片组件中，极片为正极极片或负极极片。
极片组件包括正极极片时可以作为传统正极极片的替代物制作电极组件，此时防护层可以防止正极极片的毛刺刺穿隔膜，极片组件包括负极极片时可以作为传统负极极片的替代物制作电极组件，此时防护层可以防止负极极片的毛刺刺穿隔膜，因此，无论极片是正极极片还是负极极片，均能提高包括该极片组件的电极组件、电池单体、电池和用电设备的安全性能。
本公开第二方面提供一种电极组件，包括本公开第一方面的极片组件。
本公开的电极组件具有本公开的极片组件具有的优点。
在一些实施例的电极组件中，电极组件为卷绕式电极组件，极片组件的端部区域的延伸方向与卷绕式电极组件的轴线平行。
电极组件为卷绕式电极组件，将极片组件的端部区域的延伸方向设置为与卷绕式电极组件的轴线平行，端部区域位于卷绕式电极组件的径向内端或径向外端，此时防护层除承担防止毛刺刺破隔膜的功能外，还可以对电极组件承担一定的支撑功能，相比于在电极主体的端部区域不设置防护层的卷绕式电极组件而言，本公开的卷绕式电极组件的强度更高，可减少电极组件因强度不足发生塌陷的现象，从而利于进一步提高卷绕式电极组件及具有该卷绕式电极组件的电池单体和电池的安全性能。
本公开第三方面提供一种电池单体，包括本公开第二方面的电极组件。
本公开的电池单体具有本公开的电极组件具有的优点。
本公开第四方面提供一种电池，包括本公开第三方面的电池单体。
本公开的电池具有本公开的电池单体具有的优点。
本公开第五方面提供一种用电设备，包括本公开第四方面的电池，电池用于为用电设备提供电力。
本公开的用电设备具有本公开的电池单体具有的优点。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对本公开实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1为本公开一实施例的用电设备的结构示意图；
图2为本公开一实施例的电池的分解结构示意图；
图3为本公开一实施例的电池单体的分解结构示意图；
图4为本公开一实施例的极片组件在卷绕状态下在结构示意图，其中为清楚展现极片主体及极片主体与防护层的位置关系，而未示出极片的极耳；
图5为本公开一实施例的一种极片组件在展平状态下在结构示意图；
图6为图5的放大的仰视图；
图7为图6的B部放大结构示意图；
图8为图6的A-A向放大的剖视结构示意图；
图9为图8的C部放大结构示意图；
图10为用于制作防护层的胶带的一个实施例的结构示意图；
图11为用于制作防护层的胶带的另一个实施例的结构示意图；
图12为用于制作防护层的胶带的又一个实施例的结构示意图；
图13为用于制作防护层的胶带的又一个实施例的结构示意图；
图14为用于制作防护层的胶带的又一个实施例的结构示意图。
在附图中，附图并未按照实际的比例绘制。
具体实施方式
下面结合附图和实施例对本公开的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本公开的原理，但不能用来限制本公开的范围，即本公开不限于所描述的实施例。
在本公开的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本公开的具体结构进行限定。在本公开的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本公开中的具体含义。
在形成本公开的过程中，发明人发现，电池单体在使用过程中发生膨胀后在正极极片和负极极片的端部区域附近易发生内部短路的原因为：
如果不对极片的端部区域的毛刺进行处理，电极组件作为电池单体的核心部件，在电池使用过程中发生膨胀，极片的端部区域的毛刺易刺破隔膜，可能导致正极极片和负极极片通过毛刺连接，从而引发电池内部短路，进而引发安全事故。
因此，本公开提供了一种极片组件，在电极的电极主体的端部区域设置防护层，覆盖端部区域的主端面和与主端面相邻的表面，防护层包裹住端部区域的毛刺，防止毛刺刺破隔膜，从而可以防止电极主体发生内部短路，提高极片的安全性能。进一步地，本公开还提供一种具有该极片组件的电极组件，具有该电极组件的电池单体，具有该电池单体的电池以及具有该电池的用电设备。
本公开实施例提供一种使用电池作为电源的用电设备，电池被配置为对用电设备提供电能。用电设备可以为但不限于手机、便携式设备、笔记本电脑、电瓶车、电动汽车、轮船、航天器、电动玩具和电动工具等等。例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等等。电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等。电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨。
本公开中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本公开实施例对此并不限定。电池单体可呈 圆柱体、扁平体、长方体或其它形状等，本公开实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方形电池单体和软包电池单体，本公开实施例对此也不限定。
本公开的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本公开中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体主要包括电极组件和电解液，电极组件主要由正极极片、负极极片和隔膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面。未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。涂敷正极活性物质层的正极集流体及其上的正极活性物质层构成正极极片的极片主体。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面。未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作为负极极耳。涂敷负极活性物质层的负极集流体及其上的负极活性物质层构成负极极片的极片主体。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量一般为多个且层叠在一起，负极极耳的数量一般为多个且层叠在一起。隔膜的材质可以为聚丙烯(polypropylene，PP)或聚乙烯(polyethylene，PE)等。
以下以本公开一些实施例的用电设备—车辆D为例对用电设备及其电池进行说明。
请参照图1。图1为本公开一些实施例提供的车辆D的结构示意图。车辆D可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。车辆D的内部设置有电池B，电池B可以设置在车辆D的底部或头部或尾部。电池B可以用于车辆D的供电，例如，可以作为车辆D的操作电源。
在本公开一些实施例中，电池B不仅可以作为车辆D的操作电源，还可以作为车辆D的驱动电源，代替或部分地代替燃油或天然气为车辆D提供驱动动力。
请参照图2。图2为本公开一些实施例提供的电池B的爆炸图。
电池B包括箱体1和容纳于箱体1内的电池单体20。其中，箱体1包括箱壳11 和扣合于箱壳11上的箱盖12，箱体1用于为电池单体20提供容纳空间。以上实施例中，箱体1整体为长方体，在未图示的实施例中，箱体1也可以为其它形状，如圆柱体。
在电池B中，电池单体20是多个，多个电池单体20之间可串联或并联或混联。混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起，再将多个电池单体20构成的整体容纳于箱体1内。
如图2所示，电池B可以是多个电池单体20先串联或并联或混联组成电池组2。电池组2可以形成电池模块的形式。多个电池组2再串联或并联或混联形成一个整体，并容纳于箱体1内。电池B还可以包括其他结构，例如，该电池B还可以包括汇流部件，用于实现多个电池单体20之间的电连接。
电池单体主要包括电芯、壳体和端盖组件，电芯可以包括一个或两个或更多个电极组件。电芯通过端盖组件的端盖封装于壳体的容纳空间内，容纳空间内加注电解液。电极组件设置于壳体的容纳空间内。电极组件是电池单体中发生电化学反应的部件。
电极组件可以为卷绕式结构。其中，将带状的正极极片、隔膜以及负极极片依次层叠并卷绕两圈以上形成电极组件，并且电极组件可以呈扁平状。在电极组件制作时，电极组件可直接卷绕为扁平状，使电极组件大致为六面体结构，也可以先卷绕成中空的圆柱形结构，卷绕之后再压平为扁平状。扁平面大致平行于卷绕轴线且为面积最大的外表面。扁平面可以是相对平整的表面，并不要求是纯平面。
电极组件也可为叠片式结构，即电极组件中包括多个正极极片以及多个负极极片，隔膜设置在正极极片和负极极片之间。正极极片和负极极片层叠设置。
壳体是用于提供容纳空间以将电极组件、电解液以及其他部件容纳于其内的部件。壳体可以是多种形状和多种尺寸的，例如长方体形、圆柱体形、六棱柱形等。具体地，壳体的形状可以根据电极组件的具体形状和尺寸大小来确定。壳体的材质可以选择铜、铁、铝、不锈钢、铝合金、塑胶等材料。
端盖是指盖合于壳体的开口处以将电池单体的内部环境隔绝于外部环境的部件。端盖的形状可以与壳体的形状相适应以配合壳体。可选地，端盖可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖在受挤压碰撞时就不易发生形变，使电池单体能够具备更高的结构强度，安全性能也可以有所提高。端盖上可以设置有如电极端子等的功能性部件。电极端子可以用于与电极组件电连接，以用于输出或输入电池单体的电能。在一些实施例中，端盖上还可以设置有用于在电池单体的内部压力或温度达到阈值时泄放内部压力的泄压机构。泄压机构例如为防爆阀。端盖的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本公开实施例对此不作限制。
壳体和端盖可以是独立的部件，壳体上设置有开口，通过在开口处使端盖盖合开口以形成电池单体的内部环境。不限地，也可以使端盖和壳体一体化，具体地，端盖和壳体可以在将其他部件装入壳前先形成一个共同的连接面，当需要封装壳体的内部时，再使端盖盖合壳体，并将壳体和端盖封装为一体。
在一些实施例的电池单体中，在端盖的内侧还可以设置有绝缘件，绝缘件可以用于隔离壳体内的电连接部件与端盖，以降低短路的风险。示例性的，绝缘件例如可以为绝缘板，可以由塑料、橡胶等材料制造。
端盖和设置于端盖上的各元件，如电极端子、防爆阀、绝缘板等形成端盖组件。
请参照图3。图3为本公开一实施例的电池单体的分解结构示意图。本公开实施例的电池单体20包括端盖组件21、壳体22和电芯，电芯包括两个电极组件24。
端盖组件21包括端盖211、正极端子212、负极端子213、防爆阀214和绝缘板215。端盖211用于与壳体22配合以将电芯封装于端盖211和壳体22形成的密闭的容纳空间内。正极端子212和负极端子213可以分别通过正极连接片22和负极连接片23与对应的电极组件24的正极极耳242和负极极耳243电连接。绝缘板215布置于端盖211与正极连接片22和负极连接片23之间，用于实现端盖211与正极连接片22和负极连接片23以及各电极组件24之间的绝缘。
电极组件24包括电极组件本体241、正极极耳242和负极极耳243。电极组件24包括本公开实施例的极片组件30。
以下将结合图4至图13对本公开实施例的极片组件30进行说明。
如图4至13所示，本公开实施例的极片组件30包括极片31和防护层32。极片31包括极片主体311，极片主体311具有端部区域311A。防护层32固定于极片主体311上，包括沿端部区域311A的延伸方向覆盖端部区域311A的防护层主体段321。防护层主体段321包括主端面主体防护部3211和分别连接于主端面主体防护部3211的两侧的两个侧面主体防护部3212。主端面主体防护部3211覆盖端部区域311A的主端面3111A，侧面主体防护部3212从端部区域311A的主端面3111A向极片主体311的内侧延伸并覆盖端部区域311A的靠近主端面3111A的侧面3111B。
极片主体311的端部区域311A可以为一个，也可以为两个或以上。如图4至图9所示的实施例中，极片主体311包括位于极片主体311的长度方向(图5中的X方向)的两端的两个端部区域311A，端部区域311A的延伸方向与极片主体311的宽度方向(图5中的Y方向)一致。本公开实施例的极片组件30用于二次电池。
在本公开实施例的极片组件30中，在极片组件30的极片31的端部区域311A设 置固定于极片主体311上的防护层32，防护层32包括沿端部区域311A的延伸方向覆盖端部区域311A的防护层主体段321，，该防护层32的主端面主体防护部3211和两个侧面主体防护部3212可以将端部区域311A的主端面3111A和侧面3111B包裹起来，从而将极片主体311的端部区域311A的毛刺与隔膜隔离，利于减少端部区域311A处的毛刺刺穿隔膜的现象，从而利于减少隔膜被刺穿引发的正极极片主体和负极极片主体之间的内部短路，提高包括该极片组件30的电极组件、电池单体、电池和用电设备的安全性能。
在一些实施例的极片组件30中，如图9所示，侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E与端部区域311A的主端面3111A的最大距离L1为2mm至100mm。该最大距离L1例如为3mm、5mm、16mm、30mm、45mm、60mm、75mm、95mm等。
合理设置侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E与端部区域311A的主端面3111A的最大距离L1，一方面使防护层32与端部区域的侧面3111B的接触面积合理，以利于保证防护层32与端部区域311A的主端面3111A和侧面3111B结合强度，防止防护层32部分或全部脱落，影响防护效果，另一方面，可以限制防护层32覆盖端部区域的侧面3111B的面积，限制因设置防护层32引起的电池容量损失。
在一些实施例的极片组件30中，如图4至14所示，防护层32包括粘贴于极片主体311的胶带320。
采用胶带320制作防护层32，胶带320本身易于制备，形状和尺寸易于满足设计要求，可在与极片主体311组装前制备好胶带320，胶带320易于与极片主体311组装，胶带320在极片主体311上的组装位置也易于控制，极片组件30的加工效率较高，对电极组件的制作过程影响较小。
胶带320可以采用聚乙烯(polyethylene，PE)或聚丙烯(polypropylene，PP)等材质为主体制成。
在未图示的实施例中，防护层的形成可以有多种方式。例如，防护层也可以直接由带状片材通过涂胶或热压等方式固定到极片主体的端部区域，或者可以通过在极片主体的端部区域涂覆防护材料的方式形成防护层。
在一些实施例的极片组件30中，两个侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E与端部区域311A的主端面3111A的最大距离L1相等。
两个侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E与 端部区域311A的主端面3111A的最大距离L1设置为相等，利于两个侧面主体防护部3212均能与端部区域311A的侧面3111B的接触面积处于合理范围，以利于同时保证防护层32与端部区域311A的主端面3111A和两个侧面3111B的结合强度，而防护层32与两个侧面3111B的结合强度接近，不易出现单侧脱离的现象及因单侧脱离逐渐引起防护层32整体脱落的现象而利于保证防护层32的防护效果，也利于使两个侧面主体防护部3212覆盖端部区域311A的侧面3111B的面积均一，减小因单侧覆盖端部区域311A的侧面3111B的面积过大的情况，从而减小设置防护层32对电池容量的影响。
在一些实施例的极片组件30中，两个侧面主体防护部3212相对于极片31的厚度方向(图8中的Z方向)对称设置。
两个侧面主体防护部3212相对于极片31的厚度方向对称设置，利于两个侧面主体防护部3212与端部区域的侧面3111B的接触面积均处于合理范围并较为一致，以利于防护层32与端部区域的主端面3111A和两个侧面3111B的结合强度合理且结合强度接近，从而防护层32与两个侧面3111B的结合强度接近，不易出现单侧脱离的现象及因单侧脱离逐渐引起防护层32整体脱落的现象而利于保证防护层32的防护效果，且利于使两个侧面主体防护部3212覆盖端部区域311A的侧面3111B的面积一致，减小因单侧覆盖端部区域311A的侧面3111B的面积过大的情况，从而减小设置防护层32对电池容量的影响。
在一些实施例的极片组件30中，侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为直线型边缘；或侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为折线型边缘；或侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为曲线型边缘；或侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为包括直线型边缘和曲线型边缘的组合型边缘。
如图10至图14所示，其中示出了采用胶带320作为防护层32的材料制作极片组件30时适用的胶带320的不同形状。其中图10是制造图4至图9所示实施例的极片组件30时所采用的胶带320的形状。图11至图14为图4至图10所示实施例中胶带320的几种不同的替代实施例。
图10至图14中，胶带320的形状由上下两条轮廓线320A和左右两条轮廓线320B形成。在图10至图14所示的各实施例的胶带320中，上下两条轮廓线320A上下对称地设置，左右两条轮廓线320B左右对称地设置。图10至图14中各虚线则代表胶带320粘贴于电极主体311后与端部区域311A的主端面3111A、侧面3111B和侧端面的各 交线及其延伸部分。胶带320与电极主体311组装后，图10至图14中的横向，即左右方向，与图4至图9所示的电极主体311的长度方向，即X方向一致，图10至图14中的纵向，即上下方向与图4至图9所示的电极主体311的宽度方向，即Y方向一致，图10至图14中的胶带10的厚度方向(垂直于纸面的方向)与图4至图9所示的电极主体311的厚度方向即Z方向一致。
以下以胶带320的不同形状对应说明侧面主体防护部3212的不同形状的实施例。
图10至图14所示，位于上、下两侧的横向虚线之间的中部胶带段3201在胶带320与电极主体311组装后构成防护层32的防护层主体段321。中部胶带段3201上的由两条纵向虚线分隔的第一中部胶带部32011在胶带320与电极主体311组装后构成防护层32的防护层主体段321的主端面主体防护部3211。中部胶带段3201的第一中部胶带部32011的横向两侧的两个第一外侧胶带部32012在胶带320与电极主体311组装后构成防护层32的防护层主体段321的两个侧面主体防护部3212。图10至图14中，胶带320的左右两侧边缘320B的位于上下两虚线之间的部分在胶带320与电极主体311组装后构成侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E。
如图10所示，胶带320的左右两侧边缘320B的上下两虚线之间的部分为直线型边缘。即在胶带320与电极主体311组装后，侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为直线型边缘。
如图11和图13所示，胶带320的左右两侧边缘320B的上下两虚线之间的部分为折线型边缘。即在胶带320与电极主体311组装后，侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为折线型边缘。该折线型边缘包括多个依次连接的直线型边缘。图11所示的实施例中折线型边缘包括的直线型边缘的数量为六个；图13所示的实施例中，折线型边缘包括的直线型边缘的数量为两个。
如图12所示，胶带320的左右两侧边缘320B的上下两虚线之间的部分为曲线型边缘。即在胶带320与电极主体311组装后，侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为曲线型边缘。该曲线型边缘包括多个依次连接的外凸曲线型边缘。图12所示的实施例中曲线型边缘包括的外凸曲线型边缘的数量为四个。
如图14所示，胶带320的左右两侧边缘320B的上下两虚线之间的部分为包括直线型边缘和曲线型边缘的组合型边缘。即在胶带320与电极主体311组装后，侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为包括直线型边缘和曲线型边缘的组合型边缘。该组合型边缘包括位于上下两侧的两个直线型边缘和位于中部的依次连接的两个外凸曲线型边缘。
侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为直线型边缘利于防护层32及极片组件30加工制造，也利于降低防护层32的损坏风险。而将侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E设置为折线型边缘、曲线型边缘或包括直线型边缘和曲线型边缘的组合型边缘，利于在保证防护层32与极片主体311的结合面积从而保证防护层32与极片主体311的结合强度的同时，最大限度减小防护层32覆盖极片主体311的面积，减小设置防护层32对电池容量的影响。
在一些实施例的极片组件30中，如图10至图14所示，侧面主体防护部3212为长方形；或侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘一侧包括向远离主端面3111A的一侧凸出的至少一个凸出部。
将侧面主体防护部3212设置为长方形，利于防护层32及极片组件30加工制造，也利于降低防护层32的损坏风险，沿端部区域311A的延伸方向防护层32对极片主体311产生的影响更加一致。在侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘一侧设置向远离主端面3111A的一侧凸出的至少一个凸出部，则可以在保证防护层32与极片主体311的结合面积从而保证防护层32与极片主体311的结合强度的同时，最大限度减小防护层32覆盖极片主体311的面积，减小设置防护层32对电池容量的影响。
如图10所示，与侧面主体防护部3212对应的第一外侧胶带部32012为长方形。即在胶带320与电极主体311组装后，侧面主体防护部3212为长方形。
如图11至图14所示，与侧面主体防护部3212对应的第一外侧胶带部32012包括从纵向虚线向横向外侧凸出的至少一个凸出部3201A。即在胶带320与电极主体311组装后，侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘一侧设置向远离主端面3111A的一侧凸出的至少一个凸出部。图11所示的实施例中，每个侧面主体防护部3212对应设置三个凸出部。图12所示的实施例中，每个侧面主体防护部3212对应设置四个凸出部。图13所示的实施例中，每个侧面主体防护部3212对应设置一个凸出部。图14所示的实施例中，每个侧面主体防护部3212对应设置两个凸出部。
在一些实施例的极片组件30中，如图11至图14所示，凸出部3201A的凸出侧的边缘为折线型边缘或曲线型边缘。
将凸出部3201A的凸出侧的边缘设置为折线型边缘或曲线型边缘，均可以实现在保证防护层32与极片主体311的结合面积从而保证防护层32与极片主体311的结合强度的同时，最大限度减小防护层32覆盖极片主体311的面积，减小设置防护层32对电池容量的影响。
如图11和图13所示，与侧面主体防护部3212对应的第一外侧胶带部32012包括的凸出部3201A的凸出侧的边缘为折线型边缘。即在胶带320与电极主体311组装后，侧面主体防护部3212的凸出部的凸出侧的边缘为折线型边缘。每个凸出部的折线型边缘可以包括两个、三个或更多条直线型边缘。
如图12和图14所示，与侧面主体防护部3212对应的第一外侧胶带部32012包括的凸出部3201A的凸出侧的边缘为曲线型边缘。即在胶带320与电极主体311组装后，侧面主体防护部3212的凸出部的凸出侧的边缘为曲线型边缘。每个凸出部的曲线型边缘的形状例如可以为弧形、抛物线型或双曲线型等。
在一些实施例的极片组件30中，如图11、12和14所示，侧面主体防护部3212包括沿端部区域311A的延伸方向顺次连接的多个凸出部。
将凸出部的凸出侧的边缘设置为折线型边缘或曲线型边缘，可以实现在保证防护层32与极片主体311的结合面积从而保证防护层32与极片主体311的结合强度的同时，最大限度减小防护层32覆盖极片主体的面积，减小设置防护层对电池容量的影响。
图11所示的实施例中的胶带320应用于电极组件30时，每个侧面主体防护部3212对应设置三个顺次连接的具有折线型边缘的凸出部。图12所示的实施例中的胶带320应用于电极组件30时，每个侧面主体防护部3212对应设置四个顺次连接的具有曲线型边缘的凸出部。图14所示的实施例中的胶带320应用于电极组件30时，每个侧面主体防护部3212对应设置两个顺次连接的具有曲线型边缘的凸出部。
在一些实施例的极片组件30中，侧面主体防护部3212的多个凸出部中至少两个凸出部的至少一部分的形状和尺寸相同。
如图11、12和14所示，胶带320的第一外侧胶带部32012的多个凸出部3201A中至少两个凸出部3201A的至少一部分的形状和尺寸相同，因此，由第一外侧胶带部32012构成的侧面主体防护部3212的多个凸出部中至少两个凸出部的至少一部分的形状和尺寸相同。
将凸出部的凸出侧的边缘设置为折线型边缘或曲线型边缘，可以实现在保证防护层32与极片主体311的结合面积从而保证防护层32与极片主体311的结合强度的同时，最大限度减小防护层32覆盖极片主体的面积，减小设置防护层对电池容量的影响。
以上针对侧面主体防护部3212的描述中，虽然均是结合图10至图14以防护层32由胶带320制作的实施方式为例进行说明，然而，图10至图14所示的图形亦可视为对其它方式，如粘贴或热压带状材料，涂覆防护材料的方式所形成的防护层32的展开图形，因此，以上对侧面主体防护部3212的描述亦适用于采有其它方式形成的防护层32。
在一些实施例的极片组件30中，如图4至图9所示，主端面主体防护部3211与极片31的端部区域311A的主端面3111A贴合并连接；侧面主体防护部3212与端部区域311A的靠近主端面3111A的侧面3111B贴合并连接。
使主端面主体防护部3211与极片31的端部区域311A的主端面3111A贴合并连接，使侧面主体防护部3212与端部区域311A的靠近主端面3111A的侧面3111B贴合并连接，增加防护层32与端部区域311A的结合面积，利于在满足防护层32与极片31的结合强度的基础上减小防护层32的大小，可以减少防护层32占用的空间，节约防护层32的材料。可以通过例如粘接或热压或涂覆等方式实现防护层32与极片主体311的相应表面的贴合并连接。
在图4至图9所示的实施例中，防护层主体段321的垂直于端部区域311A的延伸方向的截面形成U形。防护层主体段321的朝向电极主体311的各表面均与电极主体311结合在一起。
在一些实施例的极片组件30中，如图4和图5所示，防护层32还包括与防护层主体段321的沿端部区域311A的延伸方向的端部连接的防护层延伸段322。
沿端部区域311A的延伸方向防护层延伸段322位于端部区域311A的外侧，其中防护层主体段321的沿端部区域311A的延伸方向的至少一端连接防护层延伸段322。
设置防护层延伸段322可以对端部区域311A的延伸方向的具有防护层延伸段322的端部进行防护，防止该端部的毛刺刺穿隔膜，利于进一步减少端部区域311A附近的毛刺刺穿隔膜的现象，从而利于进一步减少隔膜被刺穿引发的正极极片主体和负极极片主体内部短路，提高包括该极片组件30的电极组件、电池单体、电池和用电设备的安全性能。
在一些实施例的极片组件30中，如图4和图5所示，沿端部区域311A的延伸方向，防护层延伸段322的长度L2小于或等于20mm。长度L2例如可以为3mm、6mm、8mm、15mm或18mm等。
将防护层延伸段322的长度L2设置为小于或等于20mm，可以在对端部区域311A的延伸方向的具有防护层延伸段322的端部进行防护的同时，防止因对极片组件30进行进一步加工或对极片组件30所在的电极组件或电池单体进行组装的过程中因触碰防护层延伸段322而使极片31产生附加的局部受力，防止极片31因此而变形所引发的析锂等风险。
在一些实施例的极片组件30中，如图5所示，沿端部区域311A的延伸方向，两个防护层延伸段322分别连接于防护层主体段321的两端，两个防护层延伸段322的长度 L2相等。
在防护层主体段321的两端均设置防护层延伸段322可以对端部区域311A的延伸方向的两端部均进行防护，防止端部区域311A的两端的毛刺刺穿隔膜，利于进一步减少端部区域311A处的毛刺刺穿隔膜的现象，从而利于进一步减少隔膜被刺穿引发的正极极片主体和负极极片主体内部短路，提高包括该极片组件30的电极组件、电池单体、电池和用电设备的安全性能。使两个防护层延伸段322的长度L2相等，利于将两端的防护层延伸段322的长度L2均设置为适当的长度，利于对端部区域311A的延伸方向的两端均进行有效防护，也利于防止单端防护层延伸段322长度不当而使极片31因该端防护层延伸段322受力而产生附加的局部受力，防止极片31因此而变形所引发的析锂等风险。
在一些实施例的极片组件30中，如图4和图5所示，防护层延伸段322包括朝向端部区域311A的主端面3111A的延伸表面的主端面延伸防护部3221和朝向端部区域311A的侧面3111B的延伸表面的侧面延伸防护部3222。
将防护层延伸段322设置为包括主端面延伸防护部3221和侧面延伸防护部3222利于使防护层延伸段322与防护层主体段321具有相同的结构形式，在采用带状材料，如胶带320，作为主材形成防护层32时，无需对防护层延伸段322作特殊设计或处理即可在设置防护层主体段321时一并形成防护层延伸段322，可以提高极片组件30的加工效率。
如图4至图14所示，下面以应用胶带320制作防护层32为例说明防护层延伸段322及其结构。图10至图14中，如前所述，各虚线代表胶带320粘贴于电极主体311后与端部区域311A的主端面3111A、侧面3111B和侧端面的各交线及其延伸部分。胶带320与电极主体311组装后构成防护层32，位于上、下两侧的横向虚线之间的中部胶带段3201在胶带320与电极主体311组装后构成防护层32的防护层主体段321。进一步地，如图10至图14所示，位于中部胶带段3201的上下两侧的端部胶带段3202在胶带320与电极主体311组装后构成防护层32的防护层延伸段321。每个端部胶带段3202的横向中部的第二中部胶带部32021在胶带320与电极主体311组装后构成防护层延伸段321的主端面延伸防护部3211。每个端部胶带段3202的第二中部胶带部32021的横向两侧的两个第二外侧胶带部32022在胶带320与电极主体311组装后构成防护层延伸段321的侧面延伸防护部3222。
在一些未图示的实施例中，防护层延伸段322包括覆盖端部区域311A的沿端部区域311A的延伸方向的侧端面3111C的侧端面防护部。
防护层延伸段322设置为包括覆盖端部区域311A的沿端部区域311A的延伸方向 的侧端面3111C的侧端面防护部，可以对沿端部区域311A的延伸方向的侧端面3111C与隔膜之间进行更好的隔离。
以上防护层延伸段322的结构形式均能实现防护层延伸段322对端部区域311A的沿延伸方向的相应端部的毛刺与隔膜进行隔离。
在一些实施例的极片组件30中，如图4和图5所示，至少一个端部区域311A位于极片31的沿极片主体311的长度方向X的一端，端部区域311A的延伸方向为极片主体311的宽度方向Y。
一般情况下，卷绕式电极组件中的电极极片绕与宽度方向平行的轴线卷绕。端部区域311A位于极片31的沿极片主体311的长度方向X的一端，端部区域311A的延伸方向为极片主体311的宽度方向Y，极片组件30作为卷绕式电极组件中的电极极片时，端部区域311A位于卷绕式电极组件的径向内端或径向外端，此时防护层32除承担防止毛刺刺破隔膜的功能外，还可以对电极组件承担一定的支撑功能，相比于无防护层的卷绕式电极组件而言，本公开实施例的卷绕式电极组件的强度更高，可减少电极组件因强度不足发生塌陷的现象，从而利于进一步提高卷绕式电极组件及具有该卷绕式电极组件的电池单体和电池的安全性能。
在图4至图9所示的实施例中，两个端部区域311A分别位于极片31的沿极片主体311的长度方向X的两端，每个端部区域311A处均对应设置一防护层32。端部区域311A的延伸方向为极片主体311的宽度方向Y。即防护层32沿端部区域311A的延伸方向延伸，并从端部区域311A的沿其延伸方向的两个侧端面向外侧伸出一段距离。
在一些实施例的极片组件30中，极片31为正极极片或负极极片。
极片31可以为正极极片，也可以为负极极片。当极片组件30的极片31为正极极片时，极片组件30形成正极极片组件，其可以代替不包括防护层的常规正极极片参与电极组件制作。当极片组件30的极片31为负极极片时，极片组件30形成为负极极片组件，其可以代替不包括防护层的常规负极极片参与电极组件制作。
极片主体311包括极片31的涂敷活性物质层的集流体及其上的活性物质层。极片31为正极极片时，极片主体311包括极片31的涂敷正极活性物质层的正极集流体及其上的正极活性物质层；极片31为负极极片时，极片主体311包括极片31的涂敷负极活性物质层的负极集流体及其上的负极活性物质层。
极片31还包括与极片主体311的集流体连接的极耳312。极耳312的数量为多个，图5中仅示出的其中一个极耳312。
电极组件包括极片组件30时，如果电极组件为卷绕式电极组件，极片31卷绕 后，极片主体311作为构成图3所示的电极组件24的电极组件主体241的组成部分，多个极耳312重叠构成图3所示的正极极耳242(当极片31为正极极片时)或负极极耳243(当极片31为负极极片时)。
极片组件30包括正极极片时可以作为传统正极极片的替代物制作电极组件，此时防护层可以防止正极极片的毛刺刺穿隔膜，极片组件30包括负极极片时可以作为传统负极极片的替代物制作电极组件，此时防护层可以防止负极极片的毛刺刺穿隔膜，因此，无论极片是正极极片还是负极极片，均能提高包括该极片组件30的电极组件、电池单体、电池和用电设备的安全性能。
本公开实施例还提供一种电极组件，包括本公开实施例的极片组件30。
本公开实施例的电极组件具有本公开实施例的极片组件30具有的优点。
电极组件例如为图3所示的卷绕式电极组件24。
在一些实施例的电极组件中，电极组件为卷绕式电极组件，极片组件30的端部区域311A的延伸方向与卷绕式电极组件的轴线平行。图4所示的极片组件30的卷绕方式即对应于该实施例描述的电极组件中极片组件30的卷绕方式。
电极组件为卷绕式电极组件，将极片组件30的端部区域311A的延伸方向设置为与卷绕式电极组件的轴线平行，端部区域311A位于卷绕式电极组件的径向内端或径向外端，此时防护层32除承担防止毛刺刺破隔膜的功能外，还可以对电极组件承担一定的支撑功能，相比于在电极主体的端部区域不设置防护层的卷绕式电极组件而言，本公开实施例的卷绕式电极组件的强度更高，可减少电极组件因强度不足发生塌陷的现象，从而利于进一步提高卷绕式电极组件及具有该卷绕式电极组件的电池单体和电池的安全性能。
在未图示的电极组件的实施例中，本公开实施例的极片组件30亦可应用于层叠式电极组件。极片组件30应用在层叠式电极组件中时，与极片组件30应用在卷绕式电极组件类似地，由于极片组件30的极片主体311的端部区域311A的主端面3111A及相邻表面被防护层32包裹，端部区域311A的主端面及相邻表面的毛刺不易刺穿隔膜。
本公开实施例还提供一种电池单体，包括本公开实施例的的电极组件。电池单体的构成形式例如为图3所示的电池单体20，电池单体20的电极组件24为包括极片组件30的卷绕式电极组件。其中电极组件24的正极极片上设有防护层形成极片组件30。电池单体20的其它结构可参考此前的相关描述。
本公开实施例的电池单体具有本公开实施例的电极组件具有的优点。
本公开实施例还提供一种电池，包括本公开实施例的电池单体。电池的构成形式 例如为图2所示的电池B。电池B包括图3所示的多个电池单体20。电池B的其它结构可参考此前的相关描述。
本公开实施例的电池具有本公开的电池单体具有的优点。
本公开实施例还提供一种用电设备，包括本公开实施例的电池，电池用于为用电设备提供电力。用电设备例如为图1所示的车辆D。车辆D包括图2所示的电池B。电池B的其它结构可参考此前的相关描述。
本公开实施例的用电设备具有本公开实施例的电池单体具有的优点。
以下结合图4至图14对本公开实施例的电极组件30作进一步说明。
如图4至图10所示，极片组件30包括极片31和防护层32。
极片31包括极片主体311和与极片主体311连接的多个极耳312，图4中为清楚地表达极片主体311与防护层32之间的关系，未示出极耳312，图5中仅示意性示出一个极耳312。
极片主体311的沿其长度方向X的两端各自为具有端部区域311A。两端部区域311A的延伸方向均与极片主体311的宽度方向Y相同。
极片主体311的每个端部区域311A均设置有一防护层32。各防护层32由图10所示的胶带320粘贴于极片主体311的端部区域311A制成。胶带320采用聚乙烯材质为主体制成。
每个防护层32包括沿对应的端部区域311A的延伸方向覆盖端部区域311A的防护层主体段321和分别连接于防护层主体段321的两端的两个防护层延伸段322。其中，防护层主体段321由图10所示的胶带320的中部胶带段3201构成；防护层延伸段322由图10所示的胶带320的端部胶带段3202构成。
防护层主体段321包括主端面主体防护部3211和分别连接于主端面主体防护部3211的两侧的两个侧面主体防护部3212。主端面主体防护部3211覆盖端部区域311A的主端面3111A。侧面主体防护部3212从端部区域311A的主端面3111A向极片主体311的内侧延伸并覆盖端部区域311A的靠近主端面3111A的侧面3111B。其中，主端面主体防护部3211由图10所示的中部胶带段3201的第一中部胶带部32011构成，侧面主体防护部3212由图10所示的第一外侧胶带部32012构成。防护层主体段321的垂直于端部区域311A的延伸方向的截面形成U形。
如图4和图5所示，防护层延伸段322包括朝向端部区域311A的主端面3111A的延伸表面的主端面延伸防护部3221和朝向端部区域311A的侧面3111B的延伸表面的侧面延伸防护部3222。其中，主端面延伸防护部3221由图10所示的胶带320的端部胶 带段3202的第二中部胶带部32021构成，侧面延伸防护部3222由图10所示的胶带320的端部胶带段3202的第二外侧胶带部32022构成。防护层延伸段322与防护层主体段321的垂直于端部区域311A的延伸方向的截面形状相同，也形成U形。
两个侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E与端部区域311A的主端面3111A的最大距离L1相等。两个侧面主体防护部3212相对于极片31的厚度方向Z对称设置。侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E与端部区域311A的主端面3111A的最大距离L1为20mm。
如图10所示，胶带320的左右两侧边缘320B为直线型边缘。从而在胶带320与电极主体311组装后，侧面主体防护部3212的位于端部区域311A的主端面3111A内侧的边缘E为直线型边缘。并且，如图4至图10所示，与侧面主体防护部3212对应的第一外侧胶带部32012为长方形。从而在胶带320与电极主体311组装后，侧面主体防护部3212为长方形。
如图5所示，沿端部区域311A的延伸方向，两个防护层延伸段322的长度L2相等。本实施例中，防护层延伸段322的长度L2等于10mm。
图11为图10所示实施例的一个替代实施例。
图11所示实施例的胶带320与图10所示实施例的胶带320的不同之处在于，图11所示实施例的胶带320的左右两侧的边缘分别为折线形边缘。其每个第一外侧胶带部32012包括三个凸出部3201A，各凸出部3201A的凸出侧边缘为折线型边缘，各凸出部3201A的形状为三角形。
采用图11所示的胶带320代替图10所示实施例的胶带320后，极片组件30的侧面主体防护部3212的远离主端面3111A的一侧边缘为包括六个直线型边缘的折线型边缘。
采用图11所示的胶带320替代图4至图10所示实施例的胶带320后的极片组件的实施例的其余部分均可参考图4至图10所示实施例的相关说明。
图12为图10所示实施例的另一个替代实施例。
图12所示实施例的胶带320与图10所示实施例的胶带320的不同之处在于，图12所示实施例的胶带320的左右两侧的边缘分别为曲线形边缘。其每个第一外侧胶带部32012包括四个凸出部3201A，各凸出部3201A的凸出侧边缘为曲线型边缘。各凸出部3201A的形状为半圆形。
采用图12所示的胶带320代替图10所示实施例的胶带320后，极片组件30的侧面主体防护部3212的远离主端面3111A的一侧边缘为包括四个外凸曲线型边缘的曲线型 边缘。
采用图12所示的胶带320替代图4至图10所示实施例的胶带320后的极片组件的实施例的其余部分均可参考图4至图10所示实施例的相关说明。
图13为图10所示实施例的另一个替代实施例。
图13所示实施例的胶带320与图10所示实施例的胶带320的不同之处在于，图13所示实施例的胶带320的左右两侧的边缘分别为折线形边缘。其每个第一外侧胶带部32012包括一个凸出部3201A，各凸出部3201A的凸出侧边缘为折线型边缘。各凸出部3201A的形状为三角形。
采用图13所示的胶带320代替图10所示实施例的胶带320后，极片组件30的侧面主体防护部3212的远离主端面3111A的一侧边缘为包括两个直线型边缘的折线型边缘。
采用图13所示的胶带320替代图4至图10所示实施例的胶带320后的极片组件的实施例的其余部分均可参考图4至图10所示实施例的相关说明。
图14为图10所示实施例的另一个替代实施例。
图14所示实施例的胶带320与图10所示实施例的胶带320的不同之处在于，图14所示实施例的胶带320的左右两侧的边缘分别为包括直线型边缘和曲线型边缘的组合型边缘。其每个第一外侧胶带部32012包括两个凸出部3201A，各凸出部3201A的凸出侧边缘为曲线型边缘，凸出部201A的上下方向的两侧各一直线型边缘。各凸出部3201A的形状为半圆形。
采用图14所示的胶带320代替图10所示实施例的胶带320后，极片组件30的侧面主体防护部3212的远离主端面3111A的一侧边缘为包括两个位于电极极片311的宽度方向的两侧的直线型边缘和位于电极极片311的宽度方向的中部的两个外凸曲线型边缘，因此为组合型边缘。
采用图14所示的胶带320替代图4至图10所示实施例的胶带320后的极片组件的实施例的其余部分均可参考图4至图10所示实施例的相关说明。
以上各实施例中，涉及折线型边缘、曲线型边缘或组合型边缘的，边缘形状可以为其它形式，例如与折线型边缘对应的凸出部的形状也可以为梯形、与曲线型边缘或组合型边缘对应的凸出部的形状也可以为半椭圆形等。
虽然已经参考优选实施例对本公开进行了描述，但在不脱离本公开的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本公开并不局 限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (22)

  1. 一种极片组件(30)，包括：
    极片(31)，包括极片主体(311)，所述极片主体(311)具有端部区域(311A)；和
    防护层(32)，固定于所述极片主体(311)上，包括沿所述端部区域(311A)的延伸方向覆盖所述端部区域(311A)的防护层主体段(321)，所述防护层主体段(321)包括主端面主体防护部(3211)和分别连接于所述主端面主体防护部(3211)的两侧的两个侧面主体防护部(3212)，所述主端面主体防护部(3211)覆盖所述端部区域(311A)的主端面(3111A)，所述侧面主体防护部(3212)从所述端部区域(311A)的主端面(3111A)向所述极片主体(311)的内侧延伸并覆盖所述端部区域(311A)的靠近所述主端面(3111A)的侧面(3111B)。
  2. 根据权利要求1所述的极片组件(30)，其中，所述侧面主体防护部(3212)的位于所述端部区域(311A)的主端面(3111A)内侧的边缘(E)与所述端部区域(311A)的主端面(3111A)的最大距离(L1)为2mm至100mm。
  3. 根据权利要求1或2所述的极片组件(30)，其中，所述防护层(32)包括粘贴于所述极片主体(311)的胶带(320)。
  4. 根据权利要求1至3中任一项所述的极片组件(30)，其中，所述两个侧面主体防护部(3212)的位于所述端部区域(311A)的主端面(3111A)内侧的边缘(E)与所述端部区域(311A)的主端面(3111A)的最大距离(L1)相等。
  5. 根据权利要求1至4中任一项所述的极片组件(30)，其中，所述两个侧面主体防护部(3212)相对于所述极片(31)的厚度方向(Z)对称设置。
  6. 根据权利要求1至5中任一项所述的极片组件(30)，其中，
    所述侧面主体防护部(3212)的位于所述端部区域(311A)的主端面(3111A)内侧的边缘(E)为直线型边缘；或
    所述侧面主体防护部(3212)的位于所述端部区域(311A)的主端面(3111A)内侧的边缘(E)为折线型边缘；或
    所述侧面主体防护部(3212)的位于所述端部区域(311A)的主端面(3111A)内侧的边缘(E)为曲线型边缘；或
    所述侧面主体防护部(3212)的位于所述端部区域(311A)的主端面(3111A)内侧 的边缘(E)为包括直线型边缘和曲线型边缘的组合型边缘。
  7. 根据权利要求1至6中任一项所述的极片组件(30)，其中，
    所述侧面主体防护部(3212)为长方形；或
    所述侧面主体防护部(3212)的位于所述端部区域(311A)的主端面(3111A)内侧的边缘一侧包括向远离所述主端面(3111A)的一侧凸出的至少一个凸出部。
  8. 根据权利要求7所述的极片组件(30)，其中，所述凸出部的凸出侧的边缘为折线型边缘或曲线型边缘。
  9. 根据权利要求8所述的极片组件(30)，其中，所述侧面主体防护部(3212)包括沿所述端部区域(311A)的延伸方向顺次连接的多个所述凸出部。
  10. 根据权利要求9所述的极片组件(30)，其中，
    所述多个凸出部中至少两个所述凸出部的至少一部分的形状和尺寸相同。
  11. 根据权利要求1至10中任一项所述的极片组件(30)，其中，
    所述主端面主体防护部(3211)与所述极片(31)的端部区域(311A)的主端面(3111A)贴合并连接；
    所述侧面主体防护部(3212)与所述端部区域(311A)的靠近所述主端面(3111A)的侧面(3111B)贴合并连接。
  12. 根据权利要求1至11中任一项所述的极片组件(30)，其中，所述防护层(32)还包括与所述防护层主体段(321)的沿所述端部区域(311A)的延伸方向的端部连接的防护层延伸段(322)。
  13. 根据权利要求12所述的极片组件(30)，其中，沿所述端部区域(311A)的延伸方向，所述防护层延伸段(322)的长度(L2)小于或等于20mm。
  14. 根据权利要求12或13所述的极片组件(30)，其中，沿所述端部区域(311A)的延伸方向，两个所述防护层延伸段(322)分别连接于所述防护层主体段(321)的两端，所述两个防护层延伸段(322)的长度(L2)相等。
  15. 根据权利要求12至14中任一项所述的极片组件(30)，其中，
    所述防护层延伸段(322)包括朝向所述端部区域(311A)的主端面(3111A)的延伸表面的主端面延伸防护部(3221)和朝向所述端部区域(311A)的侧面(3111B)的延伸表面的侧面延伸防护部(3222)；和/或
    所述防护层延伸段(322)包括覆盖所述端部区域(311A)的沿所述端部区域(311A)的延伸方向的侧端面(3111C)的侧端面防护部。
  16. 根据权利要求1至15中任一项所述的极片组件(30)，其中，至少一个所述端部 区域(311A)位于所述极片(31)的沿所述极片主体(311)的长度方向(X)的一端，所述端部区域(311A)的延伸方向为所述极片主体(311)的宽度方向(Y)。
  17. 根据权利要求1至16中任一项所述的极片组件(30)，其中，所述极片(31)为正极极片或负极极片。
  18. 一种电极组件，包括权利要求1至17中任一项所述的极片组件(30)。
  19. 根据权利要求18所述的电极组件，其中，所述电极组件为卷绕式电极组件，所述极片组件(30)的端部区域(311A)的延伸方向与所述卷绕式电极组件的轴线平行。
  20. 一种电池单体，包括权利要求19所述的电极组件。
  21. 一种电池，包括权利要求20所述的电池单体。
  22. 一种用电设备，包括权利要求21所述的电池，所述电池用于为所述用电设备提供电力。
PCT/CN2022/104401 2022-07-07 2022-07-07 极片组件、电极组件、电池单体、电池和用电设备 WO2024007258A1 (zh)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000188115A (ja) * 1998-12-22 2000-07-04 Sony Corp 薄型電池
CN105514470A (zh) * 2015-12-14 2016-04-20 东莞新能源科技有限公司 阴极极片及采用该极片的锂离子电芯
CN211670270U (zh) * 2020-04-07 2020-10-13 北京小米移动软件有限公司 电池及电子设备
CN212113882U (zh) * 2020-06-29 2020-12-08 蜂巢能源科技有限公司 电池极片以及电池
CN112103474A (zh) * 2020-09-15 2020-12-18 横店集团东磁股份有限公司 卷绕式锂电池正极片的加工方法及卷绕式锂电池正极片
CN113228340A (zh) * 2019-03-01 2021-08-06 积水化学工业株式会社 锂离子二次电池用电极、以及锂离子二次电池

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000188115A (ja) * 1998-12-22 2000-07-04 Sony Corp 薄型電池
CN105514470A (zh) * 2015-12-14 2016-04-20 东莞新能源科技有限公司 阴极极片及采用该极片的锂离子电芯
CN113228340A (zh) * 2019-03-01 2021-08-06 积水化学工业株式会社 锂离子二次电池用电极、以及锂离子二次电池
CN211670270U (zh) * 2020-04-07 2020-10-13 北京小米移动软件有限公司 电池及电子设备
CN212113882U (zh) * 2020-06-29 2020-12-08 蜂巢能源科技有限公司 电池极片以及电池
CN112103474A (zh) * 2020-09-15 2020-12-18 横店集团东磁股份有限公司 卷绕式锂电池正极片的加工方法及卷绕式锂电池正极片

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