WO2022198503A1 - 电芯与用电装置 - Google Patents

电芯与用电装置 Download PDF

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Publication number
WO2022198503A1
WO2022198503A1 PCT/CN2021/082773 CN2021082773W WO2022198503A1 WO 2022198503 A1 WO2022198503 A1 WO 2022198503A1 CN 2021082773 W CN2021082773 W CN 2021082773W WO 2022198503 A1 WO2022198503 A1 WO 2022198503A1
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WO
WIPO (PCT)
Prior art keywords
hot
melt
adhesive layer
tab
fixed
Prior art date
Application number
PCT/CN2021/082773
Other languages
English (en)
French (fr)
Inventor
刘亚东
金哲生
Original Assignee
宁德新能源科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to EP21932131.2A priority Critical patent/EP4311011A4/en
Priority to CN202180001960.8A priority patent/CN113966567B/zh
Priority to PCT/CN2021/082773 priority patent/WO2022198503A1/zh
Publication of WO2022198503A1 publication Critical patent/WO2022198503A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/581—Devices or arrangements for the interruption of current in response to temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the technical field of batteries, and in particular, to a battery cell and an electrical device.
  • a battery cell is a device that converts external energy into electrical energy and stores it inside to supply power to external devices (such as portable electronic devices) when needed.
  • a battery cell includes a casing, an electrode assembly accommodated in the casing, an electrolyte, and a tab connected to the electrode assembly.
  • the tabs of some batteries on the market include an inner tab and an outer tab.
  • the inner tab is connected to the above-mentioned electrode assembly, one end of the outer tab is welded and fixed to the inner tab, and the other end extends out of the casing.
  • the inventor of the present application found that: after the above-mentioned inner tab and outer tab are welded, a solder mark will be formed, and the burr of the solder mark may pierce the above-mentioned shell, which makes the use of the battery cell a potential safety hazard .
  • the purpose of the present application is to provide a battery cell and an electrical device, so as to reduce the current safety hazard that the battery cell may be punctured by the welding marks of the tabs.
  • An electric core includes a shell, an electrode assembly, a tab and an insulating member.
  • the electrode assembly is accommodated in the casing, and the electrode assembly has two oppositely arranged first side surfaces.
  • the tab includes a connection part and an extension part, the connection part is accommodated in the casing and connected with the electrode assembly, and the extension part and the connection part are welded and fixed to form a solder mark.
  • the insulating member includes a heat-melting portion and an insulating portion. A hot-melt portion is fixed to the first side surface and fixed to the housing, and the hot-melt portion is configured to at least partially melt to bond the inner surface of the housing when the temperature is higher than a predetermined threshold.
  • the insulating part is connected with the heat-melting part, and the insulating part is fixed to the tab and covers at least part of the soldering print.
  • one of the tabs corresponds to two insulators, the two insulators are respectively connected to the two first sides in a one-to-one correspondence, and the insulating parts of the two insulators jointly cover the two insulators. Soldering.
  • the thickness of the hot-melt portion and the insulating portion are the same.
  • the insulating member includes a base material layer, a first adhesive layer, a hot melt layer and a filling material layer.
  • the substrate layer includes a first portion and a second portion connected to each other.
  • the first adhesive layer is disposed on the side of the substrate layer facing the electrode assembly, and the insulating member is bonded and fixed to the first side surface through the first adhesive layer.
  • a hot-melt layer is provided on a side of the first portion facing away from the first adhesive layer, the hot-melt layer includes a hot-melt adhesive layer, and the hot-melt adhesive layer is configured to melt when the temperature is higher than a preset threshold to melt Adhere the inner surface of the housing.
  • the filling material layer is fixed on the side of the second portion facing away from the first adhesive layer.
  • the hot-melt part includes a first part, a part of the first adhesive layer corresponding to the position of the first part, and a hot-melt layer;
  • the insulating part includes a second part, a part of the first adhesive layer corresponding to the position of the second part, and a filling material layer .
  • the hot-melt layer further includes a second adhesive layer, the second adhesive layer is arranged between the first part of the base material layer and the hot-melt adhesive layer, the heat The melt adhesive layer is bonded and fixed to the base material layer through the second adhesive layer.
  • the base material layer includes polyester resin; and/or the first adhesive layer includes at least one of epoxy resin, polyurethane, and polyimide; and/or, all
  • the hot melt adhesive layer includes ethylene-vinyl acetate copolymer; and/or, the filling material layer includes at least one of polyester resin and ethylene-vinyl acetate copolymer.
  • the electrode assembly includes a first pole piece and a second pole piece, and the first pole piece is wound to form a plurality of straight extending first flat parts.
  • the battery core includes at least one tab, the at least one tab includes a first tab, and the connecting parts of the first tab are respectively connected to the plurality of first flat parts.
  • the connecting portion of the first tab includes a plurality of first connecting pieces, and each of the first connecting pieces corresponds to one of the first flat portions respectively.
  • One end of the first connecting piece is connected to the first flat portion, and the other end of each first connecting piece is stacked and fixed.
  • the second pole piece is wound to form a plurality of straight extending second flat portions.
  • the at least one tab further includes a second tab, and the connecting parts of the second tab are respectively connected with the plurality of second flat parts.
  • the connecting portion of the second tab includes a plurality of second connecting pieces, and each of the second connecting pieces corresponds to one of the second flat portions respectively.
  • One end of the second connecting piece is connected to the second flat portion, and the other end of each second connecting piece is stacked and fixed.
  • the hot-melt adhesive tape fixed on the first side surface, and the hot-melt adhesive tape is fixed with the casing.
  • the hot melt tape is configured to at least partially melt to bond the inner surface of the housing when the temperature is above the predetermined threshold.
  • the thickness of the hot-melt portion is less than or equal to the thickness of the hot-melt adhesive tape.
  • Another embodiment of the present application also provides an electrical device, which includes any of the above-mentioned battery cells.
  • the battery cell provided in the embodiment of the present application includes a casing, an electrode assembly, a tab, and an insulating member.
  • the electrode assembly has two oppositely arranged first side surfaces.
  • the tab includes a connection part and an extension part, the connection part is connected with the electrode assembly, and the extension part and the connection part are welded and fixed to form a welding mark.
  • the insulating member includes a heat-melting portion and an insulating portion. The hot-melt portion is fixed on the first side surface; the insulating portion is connected to the hot-melt portion, which is fixed to the tab and covers at least part of the solder print.
  • the batteries provided by the embodiments of the present application further include an insulating member, and the insulating member covers at least part of the solder print, so that the area of the solder print in contact with the housing can be reduced or eliminated, thereby reducing The safety hazard that the battery cell may be punctured by the solder print of the tab.
  • FIG. 1 is a schematic diagram of a battery cell provided by an embodiment of the present application.
  • Fig. 2 is the schematic diagram of the electrode assembly in Fig. 1;
  • Fig. 3 is the cutaway schematic diagram along A-A line of Fig. 2;
  • Fig. 4 is the cutaway schematic diagram along B-B line of Fig. 2;
  • Fig. 5 is the structural representation of the hot melt adhesive tape in Fig. 1;
  • Fig. 6 is the structural representation of the insulating member in Fig. 2;
  • FIG. 7 is a schematic diagram of an electrical device according to an embodiment of the present application.
  • electrode assembly 210, first pole piece; 220, second pole piece; 230, isolation film; 211, first flat part; 212, first curved part; 221, second flat part; 222, second curved part part; 201, the first side; 202, the second side; 2011, the first end; 2012, the second end;
  • 400 insulating part; 410, hot melt part; 420, insulating part; 401, base material layer; 402, first adhesive layer; 403, hot melt layer; 404, filling material layer; 4011, first part; 4012, second Part; 4031, hot melt adhesive layer; 4032, second adhesive layer;
  • hot melt adhesive tape 501, base material layer; 502, first adhesive material layer; 503, hot melt material layer; 5031, hot melt adhesive material layer; 5032, second adhesive material layer;
  • the "installation” includes welding, screwing, snapping, gluing, etc. to fix or restrict a certain element or device to a specific position or place, and the element or device can be held in a specific position or place. It can also move within a limited range without moving, and the element or device can be disassembled or not disassembled after being fixed or restricted in a specific position or place, which is not limited in the embodiments of the present application.
  • FIG. 1 to FIG. 3 respectively show a schematic diagram of a battery cell 1 provided in one embodiment of the present application, a schematic diagram of the battery cell 1 with a hidden casing, and a schematic diagram of the battery cell 1 with a hidden casing rear edge diagram.
  • a schematic cross-sectional view of line A-A the cell 1 includes a casing 100 , an electrode assembly 200 , a tab 300 and an insulating member 400 .
  • the housing 100 is the mounting structure of the above-mentioned structures.
  • the electrode assembly 200 is accommodated in the casing 100 , and the electrode assembly 200 has two first side surfaces 201 opposite to each other; the first side surfaces 201 have opposite first ends 2011 and second ends 2012 .
  • the tab 300 is disposed close to the first end 2011 and extends away from the second end 2012 from the electrode assembly 200 .
  • the tab 300 includes a connecting portion 310 and an extending portion 320 .
  • the connecting portion 310 is accommodated in the casing 100 and connected to the electrode assembly 200 .
  • the insulating member 400 includes a heat-melting portion 410 and an insulating portion 420 .
  • the hot-melt portion 410 is fixed on the first side surface 201, and the hot-melt portion 410 is also fixed with the casing 100; the hot-melt portion 410 is configured to melt at least partially to bond the casing when the temperature is higher than a preset threshold 100 on the inner surface.
  • the insulating portion 420 is connected to the heat-melting portion 410 , which is fixed to the tab 300 and covers at least part of the solder print.
  • the "preset threshold" in this application document refers to the temperature of the hot-melt portion 410 rising to the temperature at which melting just begins, which is higher than the temperature of the battery cell 1 in normal use, thereby ensuring that the battery cell 1 When in a normal state (ie, when thermal runaway does not occur), the thermal fusion portion 410 is in a solid state.
  • the casing 100 is in the shape of a flat rectangular parallelepiped as a whole, and an accommodation cavity (not shown in the figure) is provided inside the casing 100 , and the accommodation cavity is used for accommodating the electrode assembly 200 and the electrolyte.
  • the battery cell 1 is a soft-packed battery cell
  • the casing 100 is an aluminum-plastic film; it can be understood that in other embodiments of the present application, the battery cell 1 can also be a hard-shell battery cell, and accordingly,
  • the casing 100 is a metal shell.
  • the above-mentioned electrode assembly 200 please refer to FIG. 3 and FIG. 4, which respectively show the cross-sectional views along the lines A-A and B-B after the battery cell 1 hides the casing 100.
  • the electrode assembly 200 is housed in The above-mentioned receiving cavity includes a first pole piece 210, a second pole piece 220 arranged at intervals, and an isolation film 230 arranged therebetween and used to separate the two.
  • the polarities of the first pole piece 210 and the second pole piece 220 are opposite, one of them is a positive pole piece, and the other is a negative pole piece; the first pole piece 210 , the second pole piece 220 and the separator 230 are stacked and arranged It is wound into a columnar structure with an oval cross section, so as to be accommodated in the above-mentioned accommodating cavity.
  • the electrode assembly 200 has two first side surfaces 201 arranged oppositely and two second side surfaces 202 arranged oppositely.
  • the two first side surfaces 201 and the two second side surfaces 202 together form the above-mentioned oval structure; wherein, the first side surfaces 201 are The plane part of the outer surface of the electrode assembly 200 has a first end 2011 and a second end 2012 oppositely arranged along the direction of the intersection of the first surface 201 and the second surface 202 , and the second side 202 is outside the electrode assembly 200 The curved portion of the surface.
  • the casing 100 is also filled with an electrolyte, the electrode assembly 200 is soaked in the electrolyte, and the electrolyte is used to provide an environment for lithium ion conduction, so that the lithium ions can be embedded in the first pole piece or the second pole piece in a timely manner, so as to realize the electrical conductivity.
  • first pole piece 210 and second pole piece 220 show a schematic cross-sectional view along the B-B line in FIG. 2 .
  • first pole piece 210 is wound and arranged to form a plurality of A first flat portion 211 extending straight and a plurality of first curved portions 212 extending in a curved manner are alternately arranged between the first flat portions 211 and the first curved portions 212 .
  • second pole piece 220 is wound to form a plurality of second flat portions 221 extending straight and a plurality of second curved portions 222 extending in a curved manner. Alternate settings.
  • the battery core 1 further includes a hot-melt adhesive tape 500 , and the hot-melt adhesive tape 500 is fixed on the first side 201 and the inner surface of the case 100 at the same time.
  • the hot-melt adhesive tape 500 is configured to melt at least partially when the temperature is higher than a preset threshold, so as to adhere to the inner surface of the case 100 , so that the battery cell 1 can be hot-melted to fuse the electrode assembly 200 and the case before leaving the factory.
  • the body 100 is fixed. Specifically, please refer to FIG.
  • the hot melt adhesive tape 500 includes a base material layer 501 , a first adhesive material layer 502 and a hot melt material layer 503 .
  • the base material layer 501 is a base material layer used to coat or support the first adhesive material layer 502 and the hot-melt material layer 503, and is in the shape of a flat cuboid with a very small thickness.
  • the base material layer 501 includes polyester resin.
  • the first adhesive material layer 502 is disposed on the side of the base material layer 501 facing the electrode assembly 200 , and has viscosity at room temperature.
  • the first adhesive material layer 502 includes at least one of epoxy resin, polyurethane and polyimide.
  • the hot-melt material layer 503 is disposed on the side of the above-mentioned base material layer 501 away from the first adhesive material layer 502, and includes a hot-melt adhesive material layer 5031; the hot-melt adhesive material layer 5031 is configured so that when the temperature is higher than a preset threshold value The melting occurs to bond the inner surface of the casing 100 , that is, the hot melt adhesive material layer 5031 is adhered and fixed to the casing 100 by means of hot melting.
  • the layer of hot melt adhesive material 5031 includes ethylene-vinyl acetate copolymer.
  • ethylene-vinyl acetate copolymer is a material widely used in hot melt adhesive, and its melting point will change with the content of vinyl acetate;
  • the melting point of the material layer 5031 is about 80°C; in some other embodiments of the present application, the content of vinyl acetate may also be 14%, and correspondingly, the melting point of the hot melt adhesive material layer 5031 is about 90°C; in the present application In other other embodiments, the content of vinyl acetate can also be 28%, correspondingly, the melting point of the hot melt adhesive material layer 5031 is about 70°C;
  • the use temperature under normal working conditions should be adjusted accordingly to the content of vinyl acetate.
  • the hot melt adhesive material layer 5031 may also include other thermoplastic resins such as polyamide, polyester amide, and polyethylene.
  • the hot-melt material layer 503 further includes a second adhesive material layer 5032 .
  • the second adhesive material layer 5032 is disposed on the side of the base material layer 501 away from the first adhesive material layer 502, which has a certain viscosity at room temperature; the hot melt adhesive material layer 5031 is adhered to the first adhesive material layer 502.
  • the side of the second adhesive material layer 5032 facing away from the base material layer 501 .
  • the material selection type of the second adhesive material layer 5032 is roughly the same as that of the first adhesive material layer 502. In the actual cell 1 product, the materials of the second adhesive material layer 5032 and the first adhesive material layer 502 can be the same , can also be different.
  • the tab 300 is disposed near the first end 2011 and extends away from the second end 2012 from the electrode assembly 200, and includes a connecting portion 310 and an extension portion 320.
  • the connecting portion 310 is accommodated in the casing 100 and connected to the electrode assembly 200 ; the extending portion 320 and the connecting portion 310 are welded and fixed, and the two form a welding mark at the welding place, and one end of the extending portion 320 passes through the casing 100 for electrical connection with external electrical components.
  • the battery cell 1 includes two tabs 300 , one tab 300 is connected to the first pole piece 210 , and the other tab 300 is connected to the second pole piece 220 ; it can be understood that in other implementations of this application In an example, the cell 1 may also include only one tab 300 , or include more than three tabs 300 , that is, the cell 1 includes at least one tab 300 .
  • the tab 300 connected to the first pole piece 210 is defined as the first tab
  • the tab 300 connected to the second pole piece 220 is defined as the second tab; The specific structure of the second tab is explained.
  • the first tab includes the aforementioned connecting portion 310 and an extending portion 320 .
  • the connecting portion 310 is connected to the plurality of first flat portions 211 respectively, and the extending portion 320 is connected to the connecting portion 310 and extends to partially extend out of the housing 100 .
  • the connecting portion 310 includes a plurality of first connecting pieces 330, and each first connecting piece 330 is located on the same side of the electrode assembly 200.
  • each first connecting piece 330 is located on the first end 2011 away from the above One end of the second end 2012 .
  • Each of the first connecting pieces 330 corresponds to a first flat portion 211 , one end of the first connecting piece 330 is connected to the corresponding first flat portion 211 , and the other end extends away from the first pole piece 210 .
  • One end of each first connecting piece 330 facing away from the first pole piece 210 is stacked and fixed.
  • the first connecting piece 330 includes a first connecting section, a first collecting section and a first bending section which are connected in sequence.
  • One end of the first connecting segment is connected to the first flat portion, and the other end extends away from the electrode assembly 200.
  • the first collection section extends in a direction perpendicular to the first flat portion 211 , and each first collection section extends in the same direction and is stacked.
  • the extension portion 320 of the first tab is L-shaped as a whole, and includes a first extension section and a second extension section that are connected to each other; the first extension section and the connection section are welded and fixed; the second extension section is bent relative to the first extension section. It is folded and arranged, and its end away from the first extension section extends out of the casing 100 .
  • the second tab is arranged in parallel with the first tab. Similar to the first tab, the second tab also includes a corresponding connecting portion 310 and an extending portion 320.
  • the connecting portion 310 is connected to a plurality of second flat tabs respectively.
  • the extension part 320 is connected with the connection part 310 and extends to partially extend out of the housing 100 .
  • the connecting portion 310 of the second tab includes a plurality of second connecting pieces, and each second connecting piece is located on the same side of the electrode assembly 200 . For example, in this embodiment, each second connecting piece is located on the above-mentioned first end 2011 The end facing away from the above-mentioned second end 2012 .
  • Each second connecting piece corresponds to a second flat portion 221 respectively, and one end of the second connecting piece is connected with the corresponding second flat portion 221, and the other end extends away from the second pole piece 220; each second connecting piece faces away from the second One end of the pole piece 220 is stacked and fixed.
  • the second connecting piece includes a second connecting section, a second collecting section and a second bending section which are connected in sequence. One end of the second connection segment is connected to the second flat portion, and the other end extends away from the electrode assembly 200 .
  • the second collection section extends along a direction perpendicular to the second flat portion 221 , and the second collection sections extend in the same direction and are stacked.
  • the extension portion 320 of the second tab is also L-shaped as a whole, and also includes a first extension segment and a second extension segment connected to each other; wherein, the first extension segment and the end of the connection portion 310 facing away from the electrode assembly 200 are welded and fixed; The two extension sections are bent relative to the first extension section, and one end of the two extension sections away from the first extension section extends out of the casing 100 .
  • insulating member 400 please refer to FIG. 2 and FIG. 3 first, which includes a hot-melt portion 410 and an insulating portion 420 .
  • the insulating portion 420 is fixed on the tab 300 and covers at least part of the solder print, so that the contact area of the solder burr with the housing 100 can be reduced or eliminated, thereby reducing the hidden danger of the solder burr piercing the housing 100 .
  • the hot-melt portion 410 is fixed to the above-mentioned first side surface 201 and is fixed to the casing 100 at the same time, and is configured to be at least partially melted to bond the inner surface of the casing 100 when the temperature is higher than a preset threshold, then the battery cell 1 is
  • the electrode assembly 200 and the casing 100 can be further fixed by means of thermal fusion before leaving the factory.
  • the setting of the hot-melt portion 410 strengthens the fixing effect of the insulating member 400, and avoids the disadvantage that the insulating member 400 is easy to fall off from the tab 300 due to the small connection area between the insulating portion 420 and the tab 300; on the other hand It also strengthens the connection strength between the electrode assembly 200 and the casing 100, thereby reducing the risk of the electrode assembly 200 slipping relative to the casing 100 when the cell 1 falls; In the process of adhering 500 to the casing 100 , the thickness of the hot-melt portion 410 itself is appropriately reduced, so as to eliminate the gap between the hot-melt adhesive tape 500 and the inner surface of the casing 100 .
  • the thickness of the hot-melt portion 410 and the insulating portion 420 are the same, which facilitates the forming of the insulating member 400 with the same thickness on the one hand, and facilitates the storage and storage of the insulating member 400 by stacking or winding on the other hand. More preferably, a part of the hot-melt portion 410 protrudes beyond the first side surface 201 , so as to avoid the disadvantage of a gap between the hot-melt tape and the inner surface of the casing 100 due to the thick insulating portion 420 .
  • each tab 300 corresponds to two insulating members 400; the two insulating members 400 are respectively connected to the two first side surfaces 201 in a one-to-one correspondence, and the two insulating members 400
  • the insulating portions 420 of the two insulators 400 are respectively disposed beyond the tabs 300 , and the insulating portions 420 of the two insulating members 400 jointly cover the soldering marks of the tabs 300 to completely wrap the soldering marks.
  • the insulating member 400 only includes the above-mentioned insulating portion 420, and part of the insulating portion 420 is fixed to the tab, and part of the insulating portion 420 is fixed to the above-mentioned first side surface.
  • the thickness of the insulating portion 420 is relatively large, and the thickness of the insulating portion 420 is greater than the thickness of the hot-melt adhesive tape 500 , the portion of the insulating portion 420 located on the first side surface will make the hot-melt adhesive and the inner surface of the casing 100 have a gap. There is a certain gap, which is not conducive to the connection between the hot melt adhesive tape and the casing 100 .
  • the insulating member 400 includes the arrangement of the hot-melt portion 410 , so that during the process of bonding the hot-melt adhesive tape 500 to the housing 100 , the insulating member 400 can be lowered by the melting of the hot-melt portion 410 . A certain thickness to eliminate the gap between the hot melt adhesive tape 500 and the casing 100 .
  • the thickness of the hot-melt portion 410 is preferably less than or equal to the thickness of the above-mentioned hot-melt adhesive tape, so as to fundamentally overcome the above deficiencies; of course, the present application is not limited to this, and in some other embodiments of the present application , the thickness of the insulating portion 420 may also be greater than the thickness of the above-mentioned hot melt adhesive tape.
  • the insulating member 400 includes a base material layer 401 , a first adhesive layer 402 , a hot melt layer 403 and a filling material layer 404 .
  • the base material layer 401 is a base material layer for coating or carrying the above-mentioned first adhesive layer 402, hot melt layer 403 and filling material layer 404, which is elongated and includes a first part 4011 and a second part connected to each other 4012.
  • the substrate layer 401 includes polyester resin.
  • the first adhesive layer 402 is disposed on the side of the base material layer 401 facing the electrode assembly 200 and covers the first portion 4011 and the second portion 4012 as a whole.
  • the first adhesive layer 402 is viscous at room temperature, and the insulating member 400 is bonded and fixed to the first side surface 201 through the first adhesive layer 402 .
  • the first adhesive layer 402 includes at least one of epoxy, polyurethane and polyimide.
  • the hot-melt layer 403 is disposed on the side of the first portion 4011 facing away from the first adhesive layer 402, and includes a hot-melt adhesive layer 4031; the hot-melt adhesive layer 4031 is configured to melt when the temperature is higher than a preset threshold to bond the shell
  • the inner surface of the body 100 that is, the hot-melt adhesive layer 4031 is bonded and fixed to the casing 100 by means of hot-melting.
  • the hot melt adhesive layer 4031 includes ethylene-vinyl acetate copolymer.
  • ethylene-vinyl acetate copolymer is a material widely used in hot melt adhesive, and its melting point will change with the content of vinyl acetate;
  • the melting point of the layer 4031 is about 80°C; and in some other embodiments of the present application, the content of vinyl acetate may also be 14%, and correspondingly, the melting point of the hot melt adhesive layer 4031 is about 90°C; in other embodiments of the present application In other embodiments, the content of vinyl acetate may also be 28%, correspondingly, the melting point of the hot melt adhesive layer 4031 is about 70°C;
  • the content of vinyl acetate should be adjusted accordingly.
  • the hot melt adhesive layer 4031 may also include other thermoplastic resins such as polyamide, polyester amide, and polyethylene.
  • the hot-melt adhesive layer 403 further includes a second adhesive layer 4032 .
  • the second adhesive layer 4032 is disposed on the side of the first portion 4011 of the base material layer 401 away from the first adhesive layer 402, which has a certain viscosity at room temperature; the hot melt adhesive layer 4031 is adhered to the second adhesive layer 402.
  • the side of the adhesive layer 4032 facing away from the base material layer 401 is that the second adhesive layer 4032 is located between the first part 4011 and the hot melt adhesive layer 4031 .
  • the material of the second adhesive layer 4032 is roughly the same as that of the first adhesive layer 402. In the actual cell 1 product, the materials of the second adhesive layer 4032 and the first adhesive layer 402 may be the same or different.
  • the filling material layer 404 is fixed on the side of the second portion 4012 facing away from the first adhesive layer 402 , which is used to increase the overall thickness of the insulating member 400 corresponding to the second portion 4012 , so as to facilitate the insulating member 400 to pass there.
  • the soldering burr is covered without being pierced by the soldering burr, and on the other hand, it is convenient to keep the parts of the insulating member 400 consistent.
  • the material of the filling material layer 404 is the same as the material of the above-mentioned base material layer 401, that is, the filling material layer 404 includes polyester resin; this is beneficial to reduce the types of raw materials of the insulating member 400, which can reduce the cost of material selection on the one hand, and the other hand. On the one hand, it is also beneficial for the insulating member 400 to be continuously coated during the manufacturing process, thereby shortening the molding cycle thereof.
  • the filling material layer 404 in this embodiment includes polyester resin
  • the main purpose is to increase the overall thickness of the insulating member 400 corresponding to the second portion 4012;
  • the filling material layer 404 may also have the same structure as the above-mentioned hot-melt layer 403, that is, it includes the second adhesive layer 4032 and the hot-melt adhesive layer at the same time;
  • the filler material layer 404 includes only ethylene vinyl acetate.
  • the hot-melt portion 410 includes a first portion 4011 , a portion corresponding to the first adhesive layer 402 and the first portion 4011 , and a hot-melt adhesive layer 4031 ; wherein the first portion 4011 is bonded and fixed to the first side surface 201 .
  • the above-mentioned insulating part 420 includes a second part 4012, a part corresponding to the first adhesive layer 402 and the second part 4012, and a filling material layer 404; wherein, the second part 4012 is bonded and fixed to the tab and covers at least part of the above-mentioned solder print .
  • the battery cell 1 provided in this embodiment of the present application includes a casing 100 , an electrode assembly 200 , a tab 300 , and an insulating member 400 .
  • the tab 300 includes a connection part 310 and an extension part 320
  • the connection part 310 is connected to the electrode assembly 200
  • the extension part 320 and the connection part 310 are welded and fixed to form a solder print.
  • the insulating member 400 includes a heat-melting portion 410 and an insulating portion 420 .
  • the hot-melt portion 410 is fixed to the first side surface 201 of the electrode assembly 200 ; the insulating portion 420 is connected to the hot-melt portion 410 , which is fixed to the tab 300 and covers at least part of the solder print.
  • the battery cell 1 provided in the embodiment of the present application further includes an insulating member 400, and the insulating member 400 covers at least part of the solder print, so that the contact between the solder print and the housing 100 can be reduced or eliminated. area, thereby reducing the potential safety hazard that the battery cell 1 may be punctured by the solder print of the tab 300 .
  • the present application also provides an electrical device.
  • FIG. 7 shows a schematic diagram of an electrical device 2 provided by one of the embodiments of the present application.
  • the electrical device 2 includes the battery cell 1 described in the above embodiment.
  • the electrical device 2 is a mobile phone; it can be understood that in other embodiments of the present application, the electrical device 2 can also be a tablet computer, a computer, a drone, and other devices that need to be driven by electricity. electrical device.

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  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

一种电芯与用电装置。电芯包括壳体（100）、电极组件（200）、极耳（300）以及绝缘件（400）。电极组件（200）具有相对设置的两第一侧面（201），第一侧面（201）具有相对的第一端（2011）与第二端（2012）。极耳（300）包括连接部（310）与延伸部（320），连接部（310）与电极组件（200）连接，延伸部（320）与连接部（310）焊接固定并形成焊印。绝缘件（400）包括热熔部（410）与绝缘部（420）。热熔部（410）固定于第一侧面（201）；绝缘部（420）与热熔部（410）连接，固定于极耳（300）并覆盖焊印的至少部分。绝缘件（400）覆盖焊印的至少部分，从而可减小或消除焊印与壳体（100）接触的面积，进而降低电芯可能被极耳（300）的焊印刺破的安全隐患。

Description

电芯与用电装置 技术领域
本申请涉及电池技术领域，尤其涉及一种电芯与用电装置。
背景技术
电芯是一种将外界的能量转化为电能并储存于其内部，以在需要的时刻对外部设备(如便携式电子设备)进行供电的装置。一般地，电芯包括壳体、收容于壳体内的电极组件、电解液以及与电极组件连接的极耳。
目前，市场上有些电芯的极耳包括内极耳与外极耳两部分。具体地，内极耳与上述电极组件连接，外极耳的一端与内极耳焊接固定，另一端延伸至壳体之外。
本申请的发明人在实现本申请的过程中发现：上述内极耳与外极耳焊接后将形成焊印，而焊印的毛刺可能刺破上述壳体，其使得电芯的使用具有安全隐患。
发明内容
本申请旨在提供一种电芯与用电装置，以降低目前电芯可能被极耳的焊印刺破的安全隐患。
本申请为了解决其技术问题，采用以下技术方案：
一种电芯，包括壳体、电极组件、极耳以及绝缘件。所述电极组件收容于所述壳体，所述电极组件具有相对设置的两第一侧面。所述极耳包括连接部与延伸部，所述连接部收容于所述壳体并与所述电极组件连接，所述延伸部与所述连接部焊接固定并形成焊印。所述绝缘件包括热熔部与绝缘部。热熔部固定于所述第一侧面，并与所述壳体固定，所述热熔部被配置为在温度高于预设阈值时至少部分发生熔化以粘接所述壳体的内表面。绝缘部与所述热熔部连接，所述绝缘部固定于所述极耳并覆盖所述焊印的至少部分。
作为上述技术方案的进一步改进方案，一所述极耳对应两绝缘件，所述两绝缘件分别一一对应地连接于两所述第一侧面，两所述绝缘件的绝缘部共同覆盖所述焊印。
作为上述技术方案的进一步改进方案，所述热熔部的一部分伸出至所述第一侧面之外。
作为上述技术方案的进一步改进方案，所述热熔部与所述绝缘部的厚度相同。
作为上述技术方案的进一步改进方案，所述绝缘件包括基材层、第一胶粘剂层、热熔层以及填充材料层。基材层包括彼此连接的第一部分与第二部分。第一胶粘剂层设于所述基材层面向所述电极组件的一面，所述绝缘件通过所述第一胶粘剂层粘接固定于所述第一侧面。热熔层设于所述第一部分背离所述第一胶粘剂层的一面，所述热熔层包括热熔胶层，所述热熔胶层被配置为在温度高于预设阈值时发生熔化以粘接所述壳体的内表面。填充材料层固设于所述第二部分背离所述第一胶粘剂层的一面。所述热熔部包括第一部分、第一胶粘剂层与第一部分位置对应的部分以及热熔层，所述绝缘部包括第二部分、第一胶粘剂层与第二部分位置对应的部分以及填充材料层。
作为上述技术方案的进一步改进方案，所述热熔层还包括第二胶粘剂层，所述第二胶粘剂层设置在所述基材层的第一部分与所述热熔胶层之间，所述热熔胶层通过所述第二胶粘剂层粘接固定于所述基材层。
作为上述技术方案的进一步改进方案，所述基材层包括涤纶树脂；和/或，所述第一胶粘剂层包括环氧树脂、聚氨酯、聚酰亚胺中的至少一种；和/或，所述热熔胶层包括乙烯-醋酸乙烯共聚物；和/或，所述填充材料层包括涤纶树脂、乙烯-醋酸乙烯共聚物中的至少一种。
作为上述技术方案的进一步改进方案，所述电极组件包括第一极片与第二极片，所述第一极片卷绕设置并形成复数个平直延伸的第一平坦部。所述电芯包括至少一个极耳，所述至少一个极耳包括第一极耳，所述第一极耳的连接部分别与多个所述第一平坦部连接。
作为上述技术方案的进一步改进方案，所述第一极耳的连接部包括多个第一连接片，每一所述第一连接片分别对应一所述第一平坦部。所述第一连接片的一端与所述第一平坦部连接，各所述第一连接片的另一端层叠设置并固定。
作为上述技术方案的进一步改进方案，所述第二极片卷绕形成复数个平直延伸的第二平坦部。所述至少一个极耳还包括第二极耳，所述第二极耳的连接部分别与多个所述第二平坦部连接。
作为上述技术方案的进一步改进方案，所述第二极耳的连接部包括多个第二连接片，每一所述第二连接片分别对应一所述第二平坦部。所述第二连接片的一端与所述第二平坦部连接，各所述第二连接片的另一端层叠设置并固定。
作为上述技术方案的进一步改进方案，还包括固定于所述第一侧面的热熔胶带，所述热熔胶带与所述壳体固定。所述热熔胶带被配置为在温度高于所述预设阈值时至少部分发生熔化以粘接所述壳体的内表面。所述热熔部的厚度小于或等于所述热熔胶带的厚度。
本申请另一实施例还提供了一种用电装置，其包括上述任意的一种电芯。
本申请实施例的有益效果是：
本申请实施例提供的电芯包括壳体、电极组件、极耳以及绝缘件。电极组件具有相对设置的两第一侧面。极耳包括连接部与延伸部，连接部与电极组件连接，延伸部与连接部焊接固定并形成焊印。绝缘件包括热熔部与绝缘部。该热熔部固定于上述第一侧面；绝缘部与热熔部连接，其固定于极耳并覆盖焊印的至少部分。
与目前市场上的电芯相比，本申请实施例提供的电芯还包括绝缘件，该绝缘件覆盖焊印的至少部分，从而可减小或消除焊印与壳体接触的面积，进而降低电芯可能被极耳的焊印刺破的安全隐患。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，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，还可以根据这些附图示出的结构获得其他的附图。
图1为本申请一实施例提供的电芯的示意图。
图2为图1中的电极组件的示意图；
图3为图2沿A-A线的剖切示意图；
图4为图2沿B-B线的剖切示意图；
图5为图1中热熔胶带的结构示意图；
图6为图2中绝缘件的结构示意图；
图7为本申请一实施例提供的用电装置的示意图。
图中：
1、电芯；
100、壳体；
200、电极组件；210、第一极片；220、第二极片；230、隔离膜；211、第一平坦部；212、第一弯曲部；221、第二平坦部；222、第二弯曲部；201、第一侧面；202、第二侧面；2011、第一端；2012、第二端；
300、极耳；310、连接部；320、延伸部；330、第一连接片；
400、绝缘件；410、热熔部；420、绝缘部；401、基材层；402、第一胶粘剂层；403、热熔层；404、填充材料层；4011、第一部分；4012、第二部分；4031、热熔胶层；4032、第二胶粘剂层；
500、热熔胶带；501、基体材料层；502、第一粘接材料层；503、热熔材料层；5031、热熔胶材料层；5032、第二粘接材料层；
2、用电装置。
具体实施方式
为了便于理解本申请，下面结合附图和具体实施例，对本申请进行更详细的说明。需要说明的是，当元件被表述“固定于”/“固接于”另一个元件，它可以直接在另一个元件上、或者其间可以存在一个或多个居中的元件。当一个元件被表述“连接”另一个元件，它可以是直接连接到另一个元件、或者其间可以存在一个或多个居中的元件。本说明书所使用的术语“垂直的”、“水平的”、“左”、“右”、“内”、“外”以及类似的表述只是为了说明的目的。
除非另有定义，本说明书所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是用于限制本申请。本说明书所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
此外，下面所描述的本申请不同实施例中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。
在本说明书中，所述“安装”包括焊接、螺接、卡接、粘合等方式将某一元件或装置固定或限制于特定位置或地方，所述元件或装置可在特定位置或地方保持不动也可在限定范围内活动，所述元件或装置固定或限制于特定位置或 地方后可进行拆卸也可不能进行拆卸，在本申请实施例中不作限制。
请参阅图1至图3，其分别示出了本申请其中一实施例提供的电芯1的示意图、该电芯1隐藏壳体后的示意图，以及该电芯1隐藏壳体后沿图示A-A线的剖切示意图，该电芯1包括壳体100、电极组件200、极耳300以及绝缘件400。其中，壳体100是上述各结构的安装结构。电极组件200收容于壳体100，电极组件200具有相对设置的两第一侧面201；该第一侧面201具有相对的第一端2011与第二端2012。极耳300靠近上述第一端2011设置，且其自电极组件200背离上述第二端2012延伸。极耳300包括连接部310与延伸部320，连接部310收容于壳体100内并与电极组件200连接；延伸部320与连接部310焊接固定并形成焊印，其一端伸出壳体100。绝缘件400包括热熔部410与绝缘部420。该热熔部410固定于上述第一侧面201，该热熔部410同时还与壳体100固定；热熔部410被配置为在温度高于预设阈值时至少部分发生熔化以粘接壳体100的内表面。绝缘部420与热熔部410连接，其固定于上述极耳300并覆盖上述焊印的至少部分。值得一提的是，本申请文件中的“预设阈值”，是指热熔部410温度上升至恰好开始发生熔化的温度，其高于电芯1正常使用时的温度，从而确保电芯1处于正常状态时(即未发生热失控时)热熔部410处于固态。
对于上述壳体100，请参阅图1，壳体100整体呈扁平的长方体状，其内部设有收容腔(图中未示出)，该收容腔用以收容上述电极组件200以及电解液。本实施例中，电芯1为软包电芯，壳体100为铝塑膜；可以理解的是，在本申请的其他实施例中，电芯1还可以是硬壳电芯，相应地，壳体100为金属壳。
对于上述电极组件200，请参阅图3与图4，其分别示出了电芯1隐藏壳体100后沿A-A线、B-B线的剖切示意图，同时结合其他附图，该电极组件200收容于上述收容腔，其包括间隔设置的第一极片210、第二极片220，以及设于两者之间并用于分隔两者的隔离膜230。该第一极片210与第二极片220的极性相反，两者中的一个为正极片，另一个为负极片；该第一极片210、第二极片220以及隔离膜230层叠设置并卷绕为截面呈长圆形的柱状结构，以便收容于上述收容腔。电极组件200具有相对设置的两第一侧面201以及相对设置的两第二侧面202，该两第一侧面201与两第二侧面202共同围成上述长圆形结构；其中，第一侧面201为电极组件200外表面的平面部分，其具有沿第一表面201与第二表面202的交线所延伸的方向相对设置的第一端2011与第二端2012，第 二侧面202为电极组件200外表面的曲面部分。壳体100内还填充有电解液，该电极组件200浸润于电解液，电解液用于提供锂离子传导的环境，使锂离子可适时地嵌入第一极片或第二极片，从而实现电芯1的充放电过程。
对于前述第一极片210与第二极片220，请参阅图4，其示出图2沿B-B线的剖切示意图，同时结合其他附图，第一极片210卷绕设置并形成复数个平直延伸的第一平坦部211以及复数个弯曲延伸的第一弯曲部212，该第一平坦部211与第一弯曲部212之间交替设置。同理，第二极片220卷绕设置并形成复数个平直延伸的第二平坦部221以及复数个弯曲延伸的第二弯曲部222，该第二平坦部221与第二弯曲部222之间交替设置。
进一步地，为使电极组件200牢靠地固定于壳体100，该电芯1还包括热熔胶带500，该热熔胶带500固定于上述第一侧面201，且同时与壳体100的内表面固定。该热熔胶带500被配置为温度高于预设阈值时至少部分发生熔化，从而粘接壳体100的内表面，则电芯1在出厂前即可通过热熔的方式将电极组件200与壳体100固定。具体地，请参阅图5，其示出了该热熔胶带500的结构示意图，同时结合其他附图，热熔胶带500包括基体材料层501、第一粘接材料层502以及热熔材料层503。其中，基体材料层501是用于涂覆或承载上述第一粘接材料层502以及热熔材料层503的基础材料层，其呈厚度极小的扁平长方体形。可选地，基体材料层501包括涤纶树脂。第一粘接材料层502设于基体材料层501面向上述电极组件200的一面，其常温下即具有粘性，热熔胶带500通过该第一粘接材料层502粘接固定于第一侧面201。可选地，第一粘接材料层502包括环氧树脂、聚氨酯和聚酰亚胺中的至少一种。热熔材料层503设于上述基体材料层501背离第一粘接材料层502的一面，其包括热熔胶材料层5031；该热熔胶材料层5031被配置为在温度高于预设阈值时发生熔化以粘接壳体100的内表面，即是热熔胶材料层5031是通过热熔的方式实现与壳体100粘接固定的。可选地，热熔胶材料层5031包括乙烯-醋酸乙烯共聚物。其中，乙烯-醋酸乙烯共聚物是一种广泛应用于热熔胶的材料，其熔点会随醋酸乙烯的含量而发生变化；例如：本实施例中醋酸乙烯的含量为18％，则热熔胶材料层5031的熔点在80℃左右；而在本申请其他的一些实施例中，醋酸乙烯的含量还可以为14％，相应地，热熔胶材料层5031的熔点为90℃左右；在本申请其他的另一些实施例中，醋酸乙烯的含量还可以为28％，相应地，热熔胶材料层5031的熔点为70℃ 左右；在此不一一详举，设计人员可以根据电芯1的正常工况下的使用温度，对醋酸乙烯的含量进行相应调整。可以理解的是，在本申请的其他实施例中，热熔胶材料层5031还可以包括聚酰胺、聚酯酰胺和聚乙烯等其他热塑性树脂。较优地，为便于将热熔胶材料层5031设置于上述基体材料层501上，该热熔材料层503还包括第二粘接材料层5032。具体地，第二粘接材料层5032设置在基体材料层501背离上述第一粘接材料层502的一面，其于常温下即具有一定的粘性；热熔胶材料层5031则粘接于该第二粘接材料层5032背离基体材料层501的一面。第二粘接材料层5032材料的选择类型与上述第一粘接材料层502大致相同，在实际电芯1产品中，第二粘接材料层5032与第一粘接材料层502的材料可以相同，亦可以不同。
对于上述极耳300，请具体参阅图3，同时结合其他附图，极耳300靠近上述第一端2011设置，并自电极组件200背离上述第二端2012延伸，其包括连接部310以及延伸部320。其中，连接部310收容于壳体100内部，并与电极组件200连接；延伸部320与连接部310焊接固定，且两者在焊接处形成焊印，延伸部320的一端穿过上述壳体100以用于与外部的用电部件电连接。本实施例中，电芯1包括两极耳300，其中一极耳300与第一极片210连接，另一极耳300与第二极片220连接；可以理解的是，在本申请的其他实施例中，电芯1还可以仅包括一个极耳300，或者包括三个以上的极耳300，即是电芯1包括至少一个极耳300。为便于说明，以下将与第一极片210连接的极耳300定义为第一极耳，将于第二极片220连接的极耳300定义为第二极耳；接下来对第一极耳与第二极耳的具体结构作出说明。
第一极耳包括上述连接部310与延伸部320，该连接部310与分别与多个第一平坦部211连接，延伸部320则与该连接部310连接，并延伸至部分伸出壳体100。具体地，连接部310包括多个第一连接片330，各第一连接片330位于电极组件200的同一侧，例如本实施例中，各第一连接片330均位于上述第一端2011背离上述第二端2012的一端。每一第一连接片330分别对应一个第一平坦部211，且第一连接片330的一端与对应的第一平坦部211连接，另一端背离第一极片210延伸。各第一连接片330背离第一极片210的一端层叠设置并固定。更具体地，第一连接片330包括依次连接的第一连接段、第一汇集段以及第一弯曲段。其中，第一连接段的一端与第一平坦部连接，另一端背离电极 组件200延伸。第一汇集段沿垂直于第一平坦部211的方向延伸，各第一汇集段同向延伸且层叠设置。第一弯曲段的一端与第一汇集段连接，另一端朝背离电极组件200的方向弯曲；且沿第一连接片330的延伸路径，第一汇集段的延伸方向与第一弯曲段的延伸方向相反，即如图3所示，第一汇集段向图示右侧延伸，而第一弯曲段再背向电极组件200后再向图示左侧延伸；上述各第一弯曲段亦层叠设置并固定。第一极耳的延伸部320整体呈L形，其包括彼此连接的第一延伸段与第二延伸段；其中，第一延伸段与连接部焊接固定；第二延伸段相对第一延伸段弯折设置，其背离第一延伸段的一端延伸出壳体100。
第二极耳与上述第一极耳平行设置，与上述第一极耳相似，该第二极耳亦包括相应的连接部310与延伸部320，该连接部310与分别与多个第二平坦部连接，该延伸部320与连接部310连接，并延伸至部分伸出壳体100。具体地，第二极耳的连接部310包括多个第二连接片，各第二连接片位于电极组件200的同一侧，例如本实施例中，各第二连接片均位于上述第一端2011背离上述第二端2012的一端。每一第二连接片分别对应一个第二平坦部221，且第二连接片的一端与对应的第二平坦部221连接，另一端背离第二极片220延伸；各第二连接片背离第二极片220的一端层叠设置并固定。更具体地，第二连接片包括依次连接的第二连接段、第二汇集段以及第二弯曲段。其中，第二连接段的一端与第二平坦部连接，另一端背离电极组件200延伸。第二汇集段沿垂直于第二平坦部221的方向延伸，各第二汇集段同向延伸且层叠设置。第二弯曲段的一端与第二汇集段连接，另一端朝背离电极组件200的方向弯曲；且沿第二连接片的延伸路径，第二汇集段的延伸方向与第二弯曲段的延伸方向相反；上述各第二弯曲段亦层叠设置并固定。第二极耳的延伸部320亦整体呈L形，其亦包括彼此连接的第一延伸段与第二延伸段；其中，第一延伸段与连接部310背离电极组件200的一端焊接固定；第二延伸段相对第一延伸段弯折设置，其背离第一延伸段的一端延伸出壳体100。
对于上述绝缘件400，请先参阅图2与图3，其包括热熔部410与绝缘部420。其中，绝缘部420固定于上述极耳300，并覆盖上述焊印的至少部分，如此可减小或消除焊印毛刺与壳体100接触的面积，进而降低焊印毛刺扎破壳体100的隐患。热熔部410固定于上述第一侧面201且同时与壳体100固定，其被配置为在温度高于预设阈值时至少部分发生熔化以粘接壳体100的内表面，则电芯1 在出厂前即可通过热熔的方式将电极组件200与壳体100进一步固定。热熔部410的设置一方面强化了绝缘件400的固定效果，避免因绝缘部420与极耳300的连接面积较小，而导致绝缘件400容易自极耳300上脱落的弊端；另一方面也强化了电极组件200与壳体100之间的连接强度，进而降低电芯1跌落时电极组件200相对壳体100滑移风险；再一方面还可凭借其热熔的特性，在热熔胶带500与壳体100粘接的过程中，适当降低该热熔部410本身的厚度，从而利用消除热熔胶带500与壳体100内表面之间的间隙。较优地，热熔部410与绝缘部420的厚度相同，从而一方面有利于绝缘件400等厚度成型，另一方面有利于绝缘件400以层叠或卷绕的方式进行收纳、保存。更优地，热熔部410的一部分伸出至上述第一侧面201之外，如此则可避免因绝缘部420厚度较大而导致热熔胶带与壳体100内表面之间存在间隙的弊端。此外，为更全面地包裹极耳300的焊印，每一极耳300均对应两绝缘件400；该两绝缘件400分别一一对应地连接于上述两第一侧面201，该两绝缘件400的绝缘部420分别超出极耳300设置，该两绝缘件400的绝缘部420共同覆盖极耳300的焊印，以完整地包裹该焊印。
在另一些实施例中，绝缘件400仅包括上述绝缘部420，该绝缘部420的部分固定于极耳，部分固定于上述第一侧面；为确保绝缘部420能够较好地覆盖上述焊印，绝缘部420的厚度较大，且绝缘部420的厚度大于上述热熔胶带500的厚度，则绝缘部420位于上述第一侧面上的部分将使得热熔胶与壳体100的内表面之间具有一定间隙，其不利于热熔胶带与壳体100的连接。与前述实施方式相比，本实施例中绝缘件400包括热熔部410的设置，使得热熔胶带500与壳体100粘接的过程中，绝缘件400可通过热熔部410的熔化而降低一定厚度，以消除热熔胶带500与壳体100之间的间隙。综上，本实施例优选热熔部410的厚度小于或等于上述热熔胶带的厚度，从而可从根本上克服上述不足；当然本申请并不局限于此，在本申请其他的一些实施例中，绝缘部420的厚度也可以是大于上述热熔胶带的厚度。
接下来请参阅图6，其示出了绝缘件400的结构示意图，本实施例中，绝缘件400包括基材层401、第一胶粘剂层402、热熔层403以及填充材料层404。基材层401是用于涂覆或承载上述第一胶粘剂层402、热熔层403以及填充材料层404的基础材料层，其呈长条形，并包括彼此连接的第一部分4011与第二部 分4012。可选地，基材层401包括涤纶树脂。第一胶粘剂层402设于基材层401面向上述电极组件200的一面，整体覆盖上述的第一部分4011与第二部分4012。该第一胶粘剂层402常温下即具有粘性，绝缘件400通过该第一胶粘剂层402而粘接固定于第一侧面201。可选地，第一胶粘剂层402包括环氧树脂、聚氨酯和聚酰亚胺中的至少一种。热熔层403设于上述第一部分4011背离第一胶粘剂层402的一面，其包括热熔胶层4031；该热熔胶层4031被配置为在温度高于预设阈值时发生熔化以粘接壳体100的内表面，即是热熔胶层4031是通过热熔的方式实现与壳体100粘接固定的。可选地，热熔胶层4031包括乙烯-醋酸乙烯共聚物。其中，乙烯-醋酸乙烯共聚物是一种广泛应用于热熔胶的材料，其熔点会随醋酸乙烯的含量而发生变化；例如：本实施例中醋酸乙烯的含量为18％，则热熔胶层4031的熔点在80℃左右；而在本申请其他的一些实施例中，醋酸乙烯的含量还可以为14％，相应地，热熔胶层4031的熔点为90℃左右；在本申请其他的另一些实施例中，醋酸乙烯的含量还可以为28％，相应地，热熔胶层4031的熔点为70℃左右；在此不一一详举，设计人员可以根据电芯1的正常工况下的使用温度，对醋酸乙烯的含量进行相应调整。可以理解的是，在本申请的其他实施例中，热熔胶层4031还可以包括聚酰胺、聚酯酰胺和聚乙烯等其他热塑性树脂。较优地，为便于将热熔胶层4031设置于上述基材层401上，该热熔层403还包括第二胶粘剂层4032。具体地，第二胶粘剂层4032设置在基材层401的第一部分4011背离上述第一胶粘剂层402的一面，其于常温下即具有一定的粘性；热熔胶层4031则粘接于该第二胶粘剂层4032背离基材层401的一面，即是：上述第二胶粘剂层4032位于第一部分4011与热熔胶层4031之间。第二胶粘剂层4032材料的选择类型与上述第一胶粘剂层402大致相同，在实际电芯1产品中，第二胶粘剂层4032与第一胶粘剂层402的材料可以相同，亦可以不同。填充材料层404固设于上述第二部分4012背离第一胶粘剂层402的一面，其用于提升绝缘件400在对应第二部分4012处的整体厚度，从而一方面便于绝缘件400可通过该处覆盖住焊印毛刺，而不会被焊印毛刺所刺穿，另一方面也便于使绝缘件400各处的部位保持一致。可选地，填充材料层404与上述基材层401的材料一致，即是该填充材料层404包括涤纶树脂；如此则有利于减少绝缘件400的原材料种类，其一方面可降低选材成本，另一方面也有利于绝缘件400在制造过程中连续涂覆而缩短其成型周期。应当理解，即使本实施例中 填充材料层404包括涤纶树脂，当本申请并不对填充材料层的具体材料做出限定，其主要目的在于提升绝缘件400在对应第二部分4012处的整体厚度；例如，在本申请其他的一些实施例中，填充材料层404还可以与上述热熔层403的结构相同，即是同时包括第二胶粘剂层4032以及热熔胶层；又例如，在本申请其他的另一些实施例中，填充材料层404仅包括乙烯-醋酸乙烯。
上述热熔部410包括第一部分4011、第一胶粘剂层402与第一部分4011所对应的部分以及热熔胶层4031；其中，第一部分4011粘接固定上述第一侧面201。上述绝缘部420包括第二部分4012、第一胶粘剂层402与第二部分4012所对应的部分以及填充材料层404；其中，第二部分4012粘接固定于极耳并覆盖上述焊印的至少部分。
本申请实施例提供的电芯1包括壳体100、电极组件200、极耳300以及绝缘件400。极耳300包括连接部310与延伸部320，连接部310与电极组件200连接，延伸部320与连接部310焊接固定并形成焊印。绝缘件400包括热熔部410与绝缘部420。该热熔部410固定于电极组件200的第一侧面201；绝缘部420与热熔部410连接，其固定于极耳300并覆盖焊印的至少部分。
与目前市场上的电芯1相比，本申请实施例提供的电芯1还包括绝缘件400，该绝缘件400覆盖焊印的至少部分，从而可减小或消除焊印与壳体100接触的面积，进而降低电芯1可能被极耳300的焊印刺破的安全隐患。
基于同一发明构思，本申请还提供一种用电装置。请参阅图7，其示出本申请其中一实施例提供的用电装置2的示意图，该用电装置2包括上述实施例中所述的电芯1。本实施例中，该用电装置2为手机；可以理解的是，在本申请的其他实施例中，该用电装置2还可以是平板电脑、电脑、无人机等其他需要由电驱动的用电装置。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；在本申请的思路下，以上实施例或者不同实施例中的技术特征之间也可以进行组合，步骤可以以任意顺序实现，并存在如上所述的本申请的不同方面的许多其它变化，为了简明，它们没有在细节中提供；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换； 而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (10)

  1. 一种电芯，包括壳体、电极组件、极耳以及绝缘件，其特征在于，所述电极组件收容于所述壳体，所述电极组件具有相对设置的两第一侧面；
    所述极耳包括连接部与延伸部，所述连接部收容于所述壳体并与所述电极组件连接，所述延伸部与所述连接部焊接固定并形成焊印；
    所述绝缘件包括：
    热熔部，固定于所述第一侧面，并与所述壳体固定，所述热熔部被配置为在温度高于预设阈值时至少部分发生熔化以粘接所述壳体的内表面；以及
    绝缘部，与所述热熔部连接，所述绝缘部固定于所述极耳并覆盖所述焊印的至少部分。
  2. 根据权利要求1所述的电芯，其特征在于，一所述极耳对应两绝缘件，所述两绝缘件分别一一对应地连接于两所述第一侧面，两所述绝缘件的绝缘部共同覆盖所述焊印。
  3. 根据权利要求1所述的电芯，其特征在于，所述热熔部的一部分伸出至所述第一侧面之外。
  4. 根据权利要求1所述的电芯，其特征在于，所述热熔部与所述绝缘部的厚度相同。
  5. 根据权利要求1至4中任一项所述的电芯，其特征在于，所述绝缘件包括：
    基材层，包括彼此连接的第一部分与第二部分；
    第一胶粘剂层，设于所述基材层面向所述电极组件的一面，所述绝缘件通过所述第一胶粘剂层粘接固定于所述第一侧面；
    热熔层，设于所述第一部分背离所述第一胶粘剂层的一面，所述热熔层包括热熔胶层，所述热熔胶层被配置为在温度高于预设阈值时发生熔化以粘接所述壳体的内表面；以及
    填充材料层，固设于所述第二部分背离所述第一胶粘剂层的一面；
    所述热熔部包括所述第一部分、所述第一胶粘剂层中与所述第一部分位置对应的部分以及热熔层，所述绝缘部包括所述第二部分、所述第一胶粘剂层中与第二部分位置对应的部分以及所述填充材料层。
  6. 根据权利要求5所述的电芯，其特征在于，所述热熔层还包括第二胶粘剂层，所述第二胶粘剂层设置在所述基材层的第一部分与所述热熔胶层之间，所述热熔胶层通过所述第二胶粘剂层粘接固定于所述基材层。
  7. 根据权利要求5所述的电芯，其特征在于，所述基材层包括涤纶树脂；和/或，
    所述第一胶粘剂层包括环氧树脂、聚氨酯、聚酰亚胺中的至少一种；和/或，
    所述热熔胶层包括乙烯-醋酸乙烯共聚物；和/或，
    所述填充材料层包括涤纶树脂、乙烯-醋酸乙烯共聚物中的至少一种。
  8. 根据权利要求1所述的电芯，其特征在于，所述电极组件包括第一极片与第二极片，所述第一极片卷绕设置并形成复数个平直延伸的第一平坦部；
    所述电芯包括至少一个极耳，所述至少一个极耳包括第一极耳，所述第一极耳的连接部分别与多个所述第一平坦部连接。
  9. 根据权利要求1所述的电芯，其特征在于，还包括固定于所述第一侧面的热熔胶带，所述热熔胶带与所述壳体固定；
    所述热熔胶带被配置为在温度高于所述预设阈值时至少部分发生熔化以粘接所述壳体的内表面；
    所述热熔部的厚度小于或等于所述热熔胶带的厚度。
  10. 一种用电装置，其特征在于，包括如权利要求1至9中任一项所述的电芯。
PCT/CN2021/082773 2021-03-24 2021-03-24 电芯与用电装置 WO2022198503A1 (zh)

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