WO2024239756A1 - 一种电池及电子产品 - Google Patents

一种电池及电子产品 Download PDF

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Publication number
WO2024239756A1
WO2024239756A1 PCT/CN2024/079838 CN2024079838W WO2024239756A1 WO 2024239756 A1 WO2024239756 A1 WO 2024239756A1 CN 2024079838 W CN2024079838 W CN 2024079838W WO 2024239756 A1 WO2024239756 A1 WO 2024239756A1
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WO
WIPO (PCT)
Prior art keywords
protective layer
battery
battery according
winding core
bent
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2024/079838
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English (en)
French (fr)
Inventor
李春鹤
王建鹏
陈磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Cosmx Battery Co Ltd
Original Assignee
Zhuhai Cosmx Battery Co Ltd
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 Zhuhai Cosmx Battery Co Ltd filed Critical Zhuhai Cosmx Battery Co Ltd
Publication of WO2024239756A1 publication Critical patent/WO2024239756A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of electronic products, and more specifically to a battery, and an electronic product provided with the battery.
  • the present application provides a battery.
  • the present application also provides an electronic product including the battery.
  • a battery comprises a shell and a winding core, wherein the shell accommodates the winding core, the shell comprises a deep pit surface and a non-deep pit surface, the winding core comprises a first pole piece, the first pole piece comprises a first current collector, a coated area and an uncoated area are arranged on the side of the first current collector away from the winding center of the winding core, the coated area is provided with a first active substance, and the uncoated area is not provided with the first active substance; the uncoated area is at least partially arranged at the winding end of the winding core, at least part of the uncoated area is provided with a protective layer, and the protective layer faces the deep pit surface.
  • the deep pit surface comprises: a first straight portion, a first bent portion and a second bent portion, and the first straight portion forms an angle with at least one of the following bent portions: the first bent portion or the second bent portion.
  • the uncoated area comprises: a first straight section, a first bent section and a second bent section, and the first straight section forms an angle with at least one of the following bent sections: the first bent section or the second bent section.
  • the first straight section faces the first straight portion; the first bent section faces the first bent portion; the second bent section faces the second bent portion; and the protective layer is applied to at least one of the following sections: the first straight section, the first bent section or the second bent section.
  • the protective layer is a ceramic layer.
  • the ceramic layer comprises boehmite, and the particle size of the boehmite comprises at least one of the following: D10 ⁇ 0.2 ⁇ m, 1.3 ⁇ m ⁇ D50 ⁇ 0.8 ⁇ m, D90 ⁇ 4 ⁇ m or D99 ⁇ 6 ⁇ m.
  • the ceramic layer comprises boehmite, and the moisture content of the boehmite is less than or equal to 1500 ppm.
  • the ceramic layer comprises boehmite, and the pH of the boehmite is between 6.5 and 8.
  • the ceramic layer is a water-based ceramic layer.
  • the tail end of the first pole piece is located in the straight area of the winding core and is arranged close to the arc area of the winding core.
  • the tail end of the first pole piece is located between the extension line of the pole ear and the bending area adjacent to the pole ear.
  • a tailing hollow foil is provided at the tailing end of the first pole piece, and at least one line of hot melt adhesive is provided on the tailing hollow foil, the area of the surface of the winding core covered by the at least one line of hot melt adhesive is greater than or equal to 50%, and the upper end of each of the at least one line of hot melt adhesive close to the pole ear does not overlap with the lower end of the pole ear close to the hot melt adhesive.
  • the at least one hot melt adhesive comprises two hot melt adhesives, and the two hot melt adhesives are eccentrically arranged.
  • the center line of the protective layer coincides with the winding center line of the winding core.
  • the first current collector is a current collector that has been corona treated.
  • a coating size of the protective layer in the width direction of the core structure is 70% to 90% of the width of the core structure.
  • the first pole piece is located on a side away from a winding center of the winding core.
  • An electronic product comprises the above-mentioned battery, wherein the side of the winding core coated with the protective layer faces the back side of the electronic product.
  • the protective layer is coated on the side of the uncoated area of the first current collector close to the deep pit surface of the shell, the distance for the sharp object to enter the battery is extended.
  • the protective layer is preferably a ceramic layer.
  • the ceramic layer has a high hardness and can buffer the pressure of the sharp object piercing the winding core. The depth of piercing the winding core is reduced, the risk of short circuit inside the winding core is reduced, and the safety of the battery is improved.
  • the protective layer is only coated on the side of the uncoated area of the first current collector close to the deep pit surface of the shell, compared with the battery without the protective layer, the battery will only have a change in thickness of one protective layer, and the width will not increase, which ensures the safety of the battery when it is punctured and the change in the battery size is not large.
  • FIG1 is a front view of a winding core structure provided in an embodiment of the present application.
  • FIG2 is a lower elevation view of another embodiment of a winding core structure
  • FIG3 is a lower front view of another embodiment of the winding core structure
  • FIG4 is a lower elevation view of another embodiment of the winding core structure
  • FIG5 is an expanded view of the first pole piece of the winding core structure
  • FIG6 is a top view of the winding core structure
  • FIG7 is a top view of the roll core structure in a state where hot melt adhesive is pasted
  • Figure 8 is a top view of the battery cell after the pit is punched
  • Figure 9 is a bottom view of the battery cell after the pit is punched.
  • the present application provides a battery and an electronic product including the battery.
  • an embodiment of the present application provides a battery, including a shell and a core, the shell accommodates the core, the shell includes a deep pit surface 19 and a non-deep pit surface, the core includes a first pole piece 1, the first pole piece 1 includes a first current collector 11, and the first current collector 11 is provided with a coated area 12 and an uncoated area 13 on the side away from the winding center of the core, the coated area 12 is provided with a first active substance 14, and the uncoated area 13 is not provided with the first active substance 14; the uncoated area 13 is at least partially provided at the winding end, and at least part of the uncoated area 3 is provided with a protective layer 15, and the protective layer 15 faces the deep pit surface.
  • the winding core has a winding structure formed by winding a first pole piece 1, a second pole piece and a diaphragm, the first pole piece 1 is located on a side away from the winding center of the winding structure, the second pole piece is located on a side close to the winding center of the winding structure, and the first pole piece 1 is located on a side close to the winding center of the winding structure.
  • the sheet 1 includes a first current collector 11 and coatings on both sides of the first current collector 11, and the first current collector 11 includes two regions on one side away from the winding center of the winding structure, which are a coating region 12 coated with a first active material 14 and an uncoated region 13 not coated with the first active material 14.
  • the protective layer 15 is coated on the uncoated region 13 of the first current collector 11, and it is ensured that the protective layer 15 is coated on the side of the uncoated region 13 close to the deep pit surface 19 of the shell. Under the above premise, it is ensured that the width of the core structure will not increase after the protective layer 15 is coated on the uncoated region 13.
  • the uncoated area 13 of the first current collector 11 on the side away from the winding center of the core structure includes a straight section and a bent section, and the protective layer 15 can be set in the straight section and the bent section, or only in the straight section, or only in the bent section.
  • the winding structure is divided into two parts along the first center line 16, and the above-mentioned straight section and the bent section are located on the same side of the first center line 16, and this side is close to the deep pit surface 19 of the shell.
  • the outer side of the core can be coated with an aluminum-plastic film, and the aluminum-plastic film is pitted before packaging to cover the core.
  • the aluminum-plastic film on the side close to the core has a deep pit surface 19
  • the aluminum-plastic film on the other side away from the core has a non-deep pit surface.
  • the side of the core coated with the protective layer 15 is close to the deep pit surface 19. After packaging is completed, the side where the deep pit surface 19 is located is close to the back side of the electronic device (the side away from the screen).
  • the non-deep pit surface mentioned here can be either a shallow pit surface 110 or a surface without pits.
  • the deep pit surface 19 and the shallow pit surface 110 are the deep pit surface 19 and the shallow pit surface 110 mentioned in the related art.
  • the protective layer 15 is coated on the side of the uncoated area 13 of the first current collector 11 close to the deep pit surface 19 of the outer shell.
  • the deep pit surface 19 is used to mark the coating position of the protective layer 15.
  • the deep pit surface 19 refers to the side that is easily punctured by sharp objects.
  • the protective layer 15 is coated on the side of the uncoated area 13 of the first current collector 11 close to the side of the electronic device facing away from the screen.
  • the width of the core structure refers to the dimension described by B in FIG. 6 .
  • first pole piece 1 is a pole piece far away from the winding center of the winding structure
  • second pole piece is a pole piece close to the winding center of the winding structure.
  • One of the first pole piece 1 and the second pole piece is a positive pole piece, and the other is a negative pole piece.
  • the sharp objects may pierce the side where the screen is located, or the side behind the screen.
  • a sharp object pierces the side where the screen is located, since the screen is relatively hard and smooth, it is not easy for the sharp object to pierce the screen and the battery behind the screen; and when a sharp object pierces the side behind the screen, generally the back of the screen of the electronic device is less hard, and the sharp object can easily pierce the back of the electronic device and even the battery of the electronic device.
  • the side of the winding core coated with the protective layer 15 is close to the back of the electronic device.
  • the protective layer 15 When a sharp object pierces, the protective layer 15 is added, which prolongs the time for the sharp object to enter the electrode.
  • the protective layer 15 has a large internal path and a high hardness. The protective layer 15 will disperse the puncture force of sharp objects to other parts of the battery, buffer the instantaneous pressure when the sharp object pierces the winding core, reduce the risk of internal short circuit, and thus improve the safety of the battery.
  • the protective layer 15 is only arranged on one side of the uncoated area 13 of the first current collector 11 close to the deep pit surface 19 of the outer shell, the width of the battery will not be increased, and only one layer of protective layer 15 is arranged in the thickness direction of the winding core, the increase in the battery thickness is also small.
  • the deep pit surface 19 includes: a first straight portion, a first bent portion, and a second bent portion.
  • the first straight portion forms an angle with at least one of the following bent portions: the first bent portion or the second bent portion;
  • the uncoated area 13 includes: a first straight section 131, a first bent section 1321, and a second bent section 1331.
  • the first straight section 131 forms an angle with at least one of the following bent sections: the first bent section 1321 or the second bent section 1331; wherein, the first straight section 131 faces the first straight portion; the first bent section 1321 faces the first bent portion; the second bent section 1331 faces the second bent portion; the protective layer 15 is coated on at least one of the following sections: the first straight section 131, the first bent section 1321, or the second bent section 1331.
  • first straight portion, the first bent portion and the second bent portion in the deep pit surface 19 refer to the first straight portion, the first bent portion and the second bent portion of the shell on the side where the deep pit surface 19 is located after the shell covers the winding core.
  • the side of the uncoated area 13 of the first current collector 11 close to the deep pit surface 19 of the shell refers to the side where the first straight section 131, the first bent section 1321 and the second bent section 1331 are located.
  • the first bent section 1321 refers to the part of the first center line 16 in the first bent area 132 close to the deep pit surface 19
  • the second bent section 1331 refers to the part of the second center line 16 in the second bent area 133 close to the deep pit surface 19.
  • the protective layer 15 it can be coated on one of the first straight section 131, the first bent section 1321 or the second bent section 1331 alone, or on both the first straight section 131 and the first bent section 1321, or on both the first straight section 131 and the second bent section 1331, or on both the first bent section 1321 and the second bent section 1331, or on all three of the first straight section 131, the first bent section 1321 and the second bent section 1331.
  • coating the protective layer 15 on the first straight section 131 will increase the thickness of the core structure without increasing the width of the core structure.
  • the protective layer 15 when the protective layer 15 is applied to the first bending section 1321 and the second bending section 1331, the protective layer 15 is applied to the first bending section 1321 and the second bending section 1331 on one side close to the first straight section 131, and is not applied to the winding core structure bending section 1321 and the second bending section 1331.
  • the center part of the folded section is ensured, and the width of the core structure will not increase after the protective layer 15 is coated.
  • the protective layer 15 on at least one of the first straight section 131, the first bent section 1321 or the second bent section 1331, the safety of the battery against puncture by sharp objects is improved while ensuring that the change in battery size is not large.
  • the protective layer 15 is coated on the first straight section 131 .
  • the protective layer 15 is applied to the first straight section 131, and only one layer of protective layer 15 is added in the thickness direction of the core structure, and there will be no change in the width direction of the core structure.
  • the straight section accounts for a large proportion of the core structure. When the battery is punctured by a sharp object, the straight section is most likely to be punctured. If the protective layer 15 is applied to the first straight section 131, the protective layer 15 is more likely to protect the core structure.
  • the first electrode sheet 1 is a positive electrode sheet
  • the corresponding first current collector 11 is a positive electrode current collector.
  • Aluminum foil is used as the first current collector 11 for illustration.
  • the protection layer 15 is a ceramic layer.
  • the main component of the ceramic layer is boehmite, which can be used as a flame retardant and decomposes above 400°C.
  • the incoming material data requires at least one of the following particle sizes: D10 ⁇ 0.2 ⁇ m, 1.3 ⁇ m ⁇ D50 ⁇ 0.8 ⁇ m, D90 ⁇ 4 ⁇ m or D99 ⁇ 6 ⁇ m; moisture ⁇ 1500ppm; pH between 6.5-8.
  • the ceramic layer is a water-based ceramic layer.
  • a water-based ceramic formula is used, deionized water is used as a solvent, and a binder is added to coat the ceramic on the surface of the aluminum foil.
  • the ceramic layer is set as a water-based ceramic layer, and then the ceramic layer is coated on the surface of the aluminum foil to form a protective layer 15, thereby increasing the adhesion between the ceramic layer and the aluminum foil.
  • the tail end of the first pole piece 1 is located in the straight region of the winding core structure and is disposed close to the arc region of the winding core structure.
  • the straight area of the core structure includes both the area indicated by the first straight section 131 on one side of the core structure in Figures 1-4 and the area indicated by the second straight section (not shown in the figure) on the other side of the core structure.
  • the arc area includes both the first bending section and the second bending section.
  • the tail end of the first pole piece 1 is located in the straight area of the core structure and is arranged close to the arc area of the core structure.
  • the thickest point of the battery cell is the position of the pole ear metal strip
  • the cutting position of the tail empty foil is as close as possible to the arc on the right side of the core, so that the tail empty foil position does not fall in the middle of the core; the advantage of doing this is that the test point of the puncture test is at the center of the battery cell. If the tail empty foil is in the center of the core (that is, the center of the battery cell), the tip of the nail of the puncture test is likely to touch the cutting position of the tail empty foil when it penetrates the battery cell. There are burrs on the cutting position, which touches the nail, increasing the probability of short circuit and increasing the risk of test failure.
  • the tail end of the first pole piece 1 is located between the extension line of the pole tab and the bending area adjacent to the pole tab.
  • the pole lug is connected to the pole piece through a metal strip, and by locating the tail end of the first pole piece 1 between the extension line of the pole lug and the bending area adjacent to the pole lug, the tail end of the first pole piece 1 can be prevented from overlapping with the metal strip of the pole lug.
  • This arrangement can solve the problem of excessive thickness of the battery cell caused by the superposition of the tab metal strip and the end foil.
  • the end foil cannot be too short, so the end foil is too arc-shaped.
  • the hot melt adhesive 18 at the end of the core is attached to the plane of the core, and the end foil cannot be attached.
  • the core is in a loose state, and the production of the subsequent process cannot be completed.
  • the center line of the protective layer 15 coincides with the winding center line of the winding core structure.
  • the center line of the protective layer 15 is the second center line 17
  • the winding center line of the core structure coincides with the center line of the protective layer 15, and at this time, the center line of the protective layer 15 and the winding center line of the core structure are both the second center line 17.
  • the center line of the protective layer 15 is aligned with the winding center line of the core structure, so that the protective layer 15 is located at the winding center line of the core structure.
  • the protective layer 15 of the core structure is centered and the weight ratio of the core structure will not change due to the setting of the protective layer 15.
  • the center line of the protective layer 15 does not coincide with the winding center line of the winding core structure, and the protective layer 15 can also be eccentrically arranged with respect to the winding core structure.
  • the first current collector 11 is a current collector that has been corona treated.
  • the aluminum foil before coating the ceramic layer, the aluminum foil is first subjected to corona treatment to remove oil stains on the surface of the aluminum foil, increase the dyne value of the foil surface, reduce the contact angle between the ceramic coating and the foil surface, increase the wetting and spreading of the ceramic on the foil surface, and ensure that there is no foil leakage after coating the ceramic and the ceramic is densely distributed;
  • the aluminum foil after corona treatment has no structural difference compared to that before corona treatment, both of which are rolled aluminum foil; the difference is that the dyne value of the foil changes before and after corona treatment; the dyne value before corona is 30, and the dyne value after corona is 32.
  • both the coated area and the uncoated area of the aluminum foil be subjected to corona treatment, or only the area to be coated with ceramic may be subjected to corona treatment. After corona treatment, the contact angle between the ceramic coating and the foil surface is reduced, the affinity of the ceramic coating on the foil surface is increased, and the ceramic coating and the foil are more closely attached.
  • the adhesion between the ceramic and the aluminum foil is increased, thereby making the ceramic layer and the aluminum foil closely bonded and improving the stability of the bonding.
  • the coating dimension of the protective layer 15 in the width direction of the core structure is 70% to 90% of the width of the core structure.
  • the dimension of the core structure in the width direction is the dimension marked by B in FIG. 6
  • the coating dimension of the protective layer 15 in the width direction of the core structure is the dimension marked by A in FIG. 6 .
  • the coating size of the protective layer 15 in the width direction of the core structure is 70% to 90% of the width of the core structure, the width of the battery will not be increased, and only one layer of protective layer 15 is provided in the thickness direction of the battery cell, so the increase in the battery thickness is also small.
  • the coating size of the protective layer 15 in the width direction of the core structure is 77% of the width of the core structure.
  • the design value of the ceramic coating length is based on the width of the battery cell.
  • the battery cell width is 65mm, and the ceramic coating length is 50mm.
  • the design principle is: the ceramic layer can effectively cover the plane position of the tail surface of the core and protect the tail surface; at the same time, the ceramic coating does not go on the arcs on both sides of the core to avoid affecting the width of the finished battery cell; the coating width of the ceramic layer is consistent with the width of the positive electrode sheet, reducing the difficulty of production and processing; at the tail of the positive electrode sheet, on the side with a short paste, a section of ceramic film with a length of about 50mm is coated, and after the film making and winding process, a core is made.
  • the ceramic coating is under the empty foil at the tail of the tail surface, and a half-folded (about 15mm wide) empty foil is seen on the right side of the core appearance; the left side is the ceramic coating, and the ceramic coating is covered by the tail empty foil by about 15mm.
  • the tail empty foil does not reach the middle of the core, and the tail is closed to the right side of the core.
  • the puncture position is in the middle of the core, and the tail empty foil is short, which can avoid the puncture position and reduce the risk of failure caused by the empty foil burrs.
  • the puncture improvement is different from the previous acupuncture improvement; the previous acupuncture improvement requires the nail to completely penetrate the battery cell and keep it without fire or explosion for 10 minutes; the puncture described in this application is that the battery cell is packed into a finished battery, and then loaded into a mobile phone product, and the mobile phone with the battery cell is freely dropped from a certain height, and a nail is installed on the lower plane corresponding to the falling position, with the nail tip facing up and the back cover of the mobile phone facing down. When the mobile phone falls, the back cover of the mobile phone contacts the nail tip, and due to gravity, the nail tip pierces the back cover of the mobile phone and then pierces the battery cell.
  • test results of the cell without ceramic coating on the outer layer of the core (ceramic layer thickness 0 ⁇ m) and the cell with 10 ⁇ m ceramic coating on the outer layer of the core are as follows:
  • the pass rate of the drop puncture test for cells with a ceramic layer on the outside of the core is significantly higher than that of cells without a ceramic layer;
  • Water-based ceramics + corona foil, ceramics and aluminum foil have good adhesion, and the pass rate of safety tests such as roller and drop of electronic products loaded with battery cells can be improved, thereby improving product safety.
  • the whole machine drum test conditions 0.5m height drum drop 2500 times, the passing standard is that the battery will not be damaged, leak, catch fire or explode after falling.
  • the battery cell voltage drop is between 0.0104 and 0.0112V. After the whole machine drop test of oil-based ceramic battery cells, the battery cell voltage drop is between 0.0149 and 0.0165V.
  • the water-based ceramic has good adhesion to the foil and the battery voltage drop is small.
  • the whole machine drop test conditions 5 rounds at 1m height + 1 round at 1.2m height + 1 round at 1.5m height.
  • the passing standard is that the battery does not break, leak, catch fire or explode after falling.
  • the battery cell voltage drop is between 0.0109 and 0.0117V. After the whole machine drop test of oil-based ceramic battery cells, the battery cell voltage drop is between 0.0147 and 0.0175V.
  • the water-based ceramic has good adhesion to the foil and the battery voltage drop is small.
  • the thickest point of the battery cell is the position of the ear metal strip, and the cutting position of the ending empty foil should be as close to the arc on the right side of the core as possible, so that the ending empty foil position does not fall in the middle of the core; the advantage of doing this is that the test point of the puncture test is at the center of the battery cell. If the ending empty foil is in the exact center of the core (that is, the exact center of the battery cell), the tip of the nail of the puncture test is likely to touch the cutting position of the ending empty foil when it pierces the battery cell. There are burrs on the cutting position, which touch the nail, increasing the probability of short circuit and increasing the risk of test failure.
  • the ending empty foil continues to shorten to the right side of the roll core so as not to overlap with the tab metal strip. This can solve the problem of large cell thickness caused by the overlapping of the tab metal strip and the ending empty foil.
  • the end of the empty foil cannot be too short, so the end of the empty foil is too arc.
  • the hot melt adhesive 18 of the core end is attached to the plane of the core, and the end of the empty foil cannot be attached, and the core is in a loose state, and the production of the back process cannot be completed.
  • the design principles of the finishing hot melt adhesive 18 are: the area covered by the hot melt adhesive 18 on the surface of the core must be ⁇ 50%; the upper end of the hot melt adhesive 18 does not overlap with the lower end of the tab metal strip; two lines of hot melt adhesive 18 are eccentrically applied to ensure that the second center line 17 of the core is covered by the hot melt adhesive 18.
  • the area of the core surface covered by the hot melt adhesive 18 must be ⁇ 50%, so that the adhesive force of the hot melt adhesive 18 is sufficient to make the core surface close.
  • the overall stability of the sealed battery is better; the upper end of the hot melt adhesive 18 does not overlap with the lower end of the pole ear metal strip, thereby avoiding affecting the thickness of the battery; because when puncturing the battery cell, most of the punctures are performed at the center line of the battery cell, two eccentric hot melt adhesives 18 are pasted to ensure that the second center line 17 of the roll core is covered by the hot melt adhesive 18, and the hot melt adhesive 18 can buffer the punctured object and reduce the puncture force of the punctured object, thereby protecting the battery cell.
  • first electrode sheet 1 can also be a negative electrode sheet, and the corresponding first current collector 11 is a negative electrode current collector.
  • the implementation of using copper foil as the first current collector 11 is similar to the above implementation, and will not be repeated again.
  • An electronic product includes the above-mentioned battery.
  • the beneficial effects of the electronic product brought by the battery can be found in the above content and will not be repeated here.
  • the side of the winding core coated with the protective layer 15 faces the back of the electronic product, where the back of the electronic product refers to the plane against which the screen of the electronic product is located.
  • the back of the screen of the electronic device is generally less hard, and the sharp object is easy to pierce the back of the electronic device until it pierces the battery of the electronic device.
  • the side of the winding core coated with the protective layer 15 is close to the back of the electronic device.
  • the protective layer 15 is added, which prolongs the distance for the sharp object to enter the inside of the electrode.
  • the hardness of the protective layer 15 is relatively high, and the protective layer 15 will disperse the piercing force of the sharp object to other parts of the battery, buffering the instantaneous pressure when the sharp object pierces the winding core, reducing the risk of internal short circuit, thereby improving the safety of the battery.

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Abstract

提供了一种电池及电子产品，电池包括外壳和卷芯，外壳收容卷芯，外壳包括深坑面（19）和非深坑面，卷芯包括第一极片（1），第一极片（1）包括第一集流体（11），第一集流体（11）背离卷芯的卷绕中心的一侧设置有涂覆区（12）和未涂覆区（13），涂覆区（12）设置有第一活性物质（14），未涂覆区（13）未设置第一活性物质（14）；未涂覆区（13）至少部分设置于卷芯的卷绕收尾端，至少部分未涂覆区（13）设置有保护层（15），保护层（15）与深坑面（19）相面对。当尖锐物体刺入电池时，增加保护层（15），延长了尖锐物体进入极片内部的路程，且保护层（15）硬度大，能缓冲尖锐物体刺入卷芯的瞬间压强，刺入卷芯的深度减少，降低了卷芯内部短路的风险，提高电池的安全性，又使电池尺寸的变化量不大。

Description

一种电池及电子产品 技术领域
本申请涉及电子产品技术领域，更具体地说涉及一种电池，以及一种设置有该电池的电子产品。
背景技术
电池的安全性问题目前没有得到系统性的解决，在消费者使用过程中，偶尔出现外力导致的电池刺破，鼓胀漏液腐蚀等情况，严重时甚至发生起火爆炸等事件。因此，随着智能电子产品持续的更新换代，电池用量和品质要求只增不减，电池安全性的重要程度日益提高。
基于以上背景，在满足电池现有的电性能要求的基础上，提高电池的安全性能势在必行，尤其是用于手机、电脑等数码产品中的与人们生活工作息息相关的电池产品，尖锐物体容易从手机电脑等数码产品的背离屏幕的一侧刺入数码产品中，如何提升被尖锐物品刺入时的安全性是本领域技术人员亟需解决的问题。
发明内容
有鉴于此，本申请提供了一种电池。本申请还提供了包括上述电池的电子产品。
本申请提供如下技术方案：
一种电池，包括外壳和卷芯，所述外壳收容所述卷芯，所述外壳包括深坑面和非深坑面，所述卷芯包括第一极片，所述第一极片包括第一集流体，所述第一集流体背离所述卷芯的卷绕中心的一侧设置有涂覆区和未涂覆区，所述涂覆区设置有第一活性物质，所述未涂覆区未设置第一活性物质；所述未涂覆区至少部分设置于所述卷芯的卷绕收尾端，至少部分未涂覆区设置有保护层,所述保护层与深坑面相面对。
优选的，所述深坑面包括：第一平直部、第一弯折部和第二弯折部，所述第一平直部与以下弯折部中的至少一个弯折部形成夹角：所述第一弯折部或所述第二弯折部。
优选的，所述未涂覆区包括：第一平直段、第一弯折段和第二弯折段，所述第一平直段与以下弯折段中的至少一个弯折段形成夹角：所述第一弯折段或所述第二弯折段。
优选的，所述第一平直段与所述第一平直部相面对；所述第一弯折段与所述第一弯折部相面对；所述第二弯折段与所述第二弯折部相面对；所述保护层涂覆于以下段中的至少一段：所述第一平直段、所述第一弯折段或所述第二弯折段。
优选的，所述保护层为陶瓷层。优选的，所述陶瓷层包括勃姆石，所述勃姆石的粒径包括以下中的至少一种：D10≥0.2μm，1.3μm≥D50≥0.8μm，D90≤4μm或D99≤6μm。
优选的，所述陶瓷层包括勃姆石，所述勃姆石的水份小于或等于1500ppm。
优选的，所述陶瓷层包括勃姆石，所述勃姆石的pH在6.5至8之间。
优选的，所述陶瓷层为水系陶瓷层。
优选的，所述第一极片的收尾端位于所述卷芯的平直区，且靠近所述卷芯的圆弧区设置。
优选的，所述第一极片的收尾端位于极耳的延长线与所述极耳相邻的弯折区之间。
优选的，所述第一极片的收尾端设置有收尾空箔，所述收尾空箔上设置有至少一道热熔胶，所述至少一道热熔胶覆盖所述卷芯的表面的面积大于或等于50％，所述至少一道热熔胶中的每道热熔胶的靠近极耳的上端与所述极耳的靠近所述热熔胶的下端不重叠。
优选的，所述至少一道热熔胶包括两道热熔胶，所述两道热熔胶偏心设置。
优选的，所述保护层的中线与所述卷芯的卷绕中心线重合。
优选的，所述第一集流体为经电晕处理的集流体。
优选的，所述保护层的在所述卷芯结构宽度方向上的涂覆尺寸为所述卷芯结构宽度的70％至90％。
优选的，所述第一极片位于远离所述卷芯的卷绕中心的一侧。
一种电子产品，包括上述电池，所述卷芯涂覆有保护层的一侧与所述电子产品的背面相面对。
当尖锐的物体刺向安装本方案电池的电子产品时，尖锐物先刺入电子产品，后依次刺入电池、电芯铝塑膜、热熔胶、保护层，最后刺入卷芯极片内部，由于在第一集流体的未涂覆区靠近外壳的深坑面的一侧涂覆有保护层，延长了尖锐物体进入电池内部的路程，保护层优选为陶瓷层，陶瓷层硬度大，能缓冲尖锐物体刺入卷芯的压强，刺入卷芯的深度减少，降低了卷芯内部短路的风险，提高电池的安全性。且由于仅在第一集流体的未涂覆区靠近外壳的深坑面的一侧涂覆有保护层，相比于未涂覆保护层的电池，也会使电池仅在厚度上有一层保护层的变化，且宽度上也不会增大，保证了电池被穿刺时的安全性，又使电池尺寸的变化量不大。
附图说明
为了更清楚地说明本申请实施例或相关技术中的技术方案，下面将对实施例或相关技术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，还可以根据提供的附图获得其他的附图。
图1为本申请实施例提供的卷芯结构正视图；
图2为卷芯结构另一种实施方式下正视图；
图3为卷芯结构又一种实施方式下正视图；
图4为卷芯结构又一种实施方式下正视图；
图5为卷芯结构第一极片的展开图；
图6为卷芯结构的俯视图；
图7为卷芯结构粘贴热熔胶状态下的俯视图；
图8为电芯冲坑后的俯视图；
图9为电芯冲坑后的仰视图。
在图1-图9中：
1-第一极片，11-第一集流体，12-涂覆区，13-未涂覆区，131-第一平直段，132-第一弯
折区，1321-第一弯折段，133-第二弯折区，1331-第二弯折段，14-第一活性物质，15-保护层，16-第一中心线，17-第二中心线，18-热熔胶，19-深坑面，110-浅坑面。
具体实施方式
本申请提供了一种电池。本申请还提供了包括上述电池的电子产品。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
相关技术中，因电池平面位置面积较大，电芯表面发生刺破的概率很大，因此，如何提升被尖锐物品刺入时的电池的安全性是本领域技术人员亟需解决的问题。
如图1-图9所示，本申请实施例提供了一种电池，包括外壳和卷芯，外壳收容卷芯，外壳包括深坑面19和非深坑面，卷芯包括第一极片1，第一极片1包括第一集流体11，第一集流体11背离卷芯的卷绕中心的一侧设置有涂覆区12和未涂覆区13，涂覆区12设置有第一活性物质14，未涂覆区13未设置第一活性物质14；未涂覆区13至少部分设置于卷绕收尾端，至少部分未涂覆区3设置有保护层15,保护层15与深坑面相面对。
具体的，卷芯具有由第一极片1、第二极片及隔膜卷绕形成的卷绕结构，第一极片1位于远离卷绕结构卷绕中心的一侧，第二极片位于靠近卷绕结构卷绕中心的一侧，第一极 片1包括第一集流体11及位于第一集流体11的两侧的涂层，而第一集流体11背离卷绕结构卷绕中心的一侧包括两个区域，该两个区域分别为涂覆有第一活性物质14的涂覆区12和未涂覆第一活性物质14的未涂覆区13。其中，保护层15涂覆于第一集流体11的未涂覆区13，且保证保护层15涂覆于未涂覆区13靠近外壳的深坑面19的一侧，在上述前提下保证在未涂覆区13涂覆保护层15之后卷芯结构的宽度并不会增大。
当然，第一极片1和其他结构一同卷绕形成卷芯结构后，第一集流体11背离卷芯结构卷绕中心的一侧的未涂覆区13包括平直段和弯折段，保护层15可以设置在平直段和弯折段，也可以仅设置在平直段，或者仅设置在弯折段。请参阅附图1-4、7中，将卷绕结构沿第一中心线16分为两部分，上述的平直段和弯折段位于第一中心线16的同一侧，且该侧为靠近外壳的深坑面19的一侧。
需要说明的是，卷芯外侧可以包覆铝塑膜，在封装前对铝塑膜冲坑，以包覆卷芯，靠近卷芯的一侧的铝塑膜具有深坑面19，远离卷芯的另一侧的铝塑膜具有非深坑面，将卷芯涂覆有保护层15的一面靠近深坑面19，封装完成后将深坑面19所在的一侧靠近电子器件的背面(背离屏幕所在侧的一侧)。这里所说的非深坑面既可以为浅坑面110，又可以为不设置坑的面。
还需要说明的是，深坑面19和浅坑面110的具体位置请参阅图8和9，深坑面19和浅坑面110为相关技术中所提到的深坑面19和浅坑面110。
又需要说明的是，保护层15涂覆于第一集流体11的未涂覆区13靠近外壳的深坑面19的一侧，深坑面19用于对保护层15的涂覆位置进行标记，深坑面19指易被尖锐物体穿刺的一面，例如在电子器件中，保护层15涂覆于第一集流体11的未涂覆区13靠近电子器件背向屏幕所在面的一侧。
又需要说明的是，卷芯结构的宽度指的是图6中B所述的尺寸。
又需要说明的是，第一极片1为远离卷绕结构的卷绕中心的极片，则第二极片为靠近卷绕结构的卷绕中心的极片，第一极片1和第二极片中的其中一者为正极片，另一者为负极片。
电子器件在日常使用过程中，当发生意外被尖锐物体刺到时，尖锐物体可能会刺到屏幕所在的一侧，也可能刺到屏幕背面的一侧。当尖锐物体刺到屏幕所在一侧时，由于屏幕硬度较大且较为光滑，则导致尖锐物体不易刺穿屏幕也就不易刺到屏幕后面的电池；而当尖锐物体刺到屏幕背面的一侧时，一般情况下电子器件的屏幕背部的硬度较小，尖锐物体易刺穿电子器件的背面，直至刺到电子器件的电池，然而本申请将卷芯涂覆有保护层15的一侧靠近电子器件的背面，当尖锐物体刺入时，增加保护层15，延长了尖锐物体进入极片 内部的路程，且保护层15硬度较大，保护层15会将尖锐物体的穿刺力分散到电池的其他部位，缓冲尖锐物体刺入卷芯时的瞬间压强，降低内部短路的风险，从而提高了电池的安全性。
而且，由于保护层15仅设置在第一集流体11的未涂覆区13靠近外壳的深坑面19的一侧，不会增加电池的宽度，且在卷芯的厚度方向上仅设置了一层保护层15，对于电池厚度的增加量也较小。
随着5G技术的到来，对电池尺寸的要求越来越高，在保证电池安全性和放电量的基础上，电池的体积越来越小是未来的发展趋势，本方案在提高尖锐物体穿刺电池的安全性的同时，也保证了电池尺寸的变化量不大，能保证电池的能量密度。
在本申请某些实施例中，请一并参阅图1至图4，深坑面19包括：第一平直部、第一弯折部和第二弯折部，第一平直部与以下弯折部中的至少一个弯折部形成夹角：第一弯折部或第二弯折部；未涂覆区13包括：第一平直段131、第一弯折段1321和第二弯折段1331，第一平直段131与以下弯折段中的至少一个弯折段形成夹角：第一弯折段1321或第二弯折段1331；其中，第一平直段131与第一平直部相面对；第一弯折段1321与第一弯折部相面对；第二弯折段1331与第二弯折部相面对；保护层15涂覆于以下段中的至少一段：第一平直段131、第一弯折段1321或第二弯折段1331。
需要说明的是，深坑面19中的第一平直部、第一弯折部和第二弯折部，指的是壳体包覆卷芯后，深坑面19所在一侧的壳体的第一平直部、第一弯折部和第二弯折部。
具体的，第一集流体11的未涂覆区13靠近壳体的深坑面19的一侧，该侧指的是第一平直段131、第一弯折段1321和第二弯折段1331三部分所在的一侧。其中，第一弯折段1321指的是第一弯折区132中第一中心线16靠近深坑面19所在一侧的部分，相应的，第二弯折段1331指的是第二弯折区133中第一中心线16靠近深坑面19所在一侧的部分。
相应的，对于保护层15的涂覆位置，可以单独涂覆在第一平直段131、第一弯折段1321或第二弯折段1331中的其中一者上，也可以涂覆在第一平直段131和第一弯折段1321二者上，又可以涂覆在第一平直段131和第二弯折段1331二者上，又可以涂覆在第一弯折段1321和第二弯折段1331二者上，还可以涂覆在第一平直段131、第一弯折段1321和第二弯折段1331三者上。
当然，保护层15涂覆于第一平直段131会增加卷芯结构的厚度，而不会增加卷芯结构的宽度。
但是，当保护层15涂覆于第一弯折段1321和第二弯折段1331时，保护层15涂覆于第一弯折段1321和第二弯折段1331靠近第一平直段131的一侧，并不涂覆于卷芯结构弯 折段中心的部分，且保证涂覆保护层15之后卷芯结构的宽度不会增大。
如此设置，通过将保护层15涂覆于第一平直段131、第一弯折段1321或第二弯折段1331中的至少一者上，在提高尖锐物体穿刺电池的安全性的同时，也保证了电池尺寸的变化量不大。
在一些优选的方案中，保护层15涂覆于第一平直段131。
这样，将保护层15涂覆于第一平直段131，在卷芯结构的厚度方向上仅仅增加一层保护层15，在卷芯结构的宽度方向上并不会有任何变化。且平直段在卷芯结构中所占的比例较大，当电池被尖锐物体穿刺时，平直段被穿刺的几率最大，将保护层15涂覆于第一平直段131，则保护层15对卷芯结构起到保护作用的几率也较大。
以下实施例中，第一极片1为正极片，相应的第一集流体11为正极集流体，以铝箔作为第一集流体11进行说明。
一些实施例中，保护层15为陶瓷层。
具体的，陶瓷层的主要成分为勃母石，该材料可作为阻燃剂使用，400℃以上分解。来料数据要求以下粒径中的至少一种粒径：D10≥0.2μm，1.3μm≥D50≥0.8μm，D90≤4μm或D99≤6μm；水份≤1500ppm；pH在6.5-8之间。
一些实施例中，陶瓷层为水系陶瓷层。
具体的，瓷浆料配料时，采用水系陶瓷配方，去离子水作为溶剂，搭配粘结剂，将陶瓷涂覆在铝箔表面。
通过将陶瓷层设置为水系陶瓷层，继而将陶瓷层涂覆在铝箔表面形成保护层15，从而增加陶瓷层与铝箔的粘接性。
一些实施例中，第一极片1的收尾端位于卷芯结构的平直区，且靠近卷芯结构的圆弧区设置。
需要说明的是，卷芯结构的平直区既包括图1-4中位于卷芯结构一侧的第一平直段131所指的区域，又包括卷芯结构另一侧的第二平直段(图中未示出)所指的区域。圆弧区既包括第一弯折段，又包括第二弯折段。
这里，第一极片1的收尾端位于卷芯结构的平直区，且靠近卷芯结构的圆弧区设置。根据电芯厚度分布，电芯最厚点为极耳金属条位置，收尾空箔裁切位置尽量靠向卷芯右侧圆弧处，做到收尾空箔位置不落在卷芯正中间；这样做的好处在于，穿刺测试的测试点在电芯中心位置，如果收尾空箔在卷芯的正中心(即电芯的正中心)，穿刺测试的钉子尖端扎入电芯时很有可能触碰到收尾空箔裁切位置，裁切位有毛刺，与钉子碰触，增加了短路的概率，使测试失效的风险加大。
一些实施例中，第一极片1的收尾端位于极耳的延长线与极耳相邻的弯折区之间。
需要说明的是，极耳通过金属条与极片连接，通过将第一极片1的收尾端位于极耳的延长线与极耳相邻的弯折区之间，能够避免第一极片1的收尾端与极耳的金属条重叠。
如此设置，一方面可解决极耳金属条和收尾空箔叠加导致的电芯厚度偏大问题；另一方面收尾空箔不能过短，所以收尾空箔过圆弧。当空箔过短时，卷芯收尾热熔胶18贴在卷芯平面上，无法将收尾空箔贴住，卷芯处于松散状态，无法完成后工序的生产。
一些实施例中，保护层15中线与卷芯结构的卷绕中心线重合。
具体的，请参阅图7，保护层15的中线为第二中心线17，卷芯结构的卷绕中心线与保护层15的中线重合，此时保护层15的中线与卷芯结构的卷绕中心线均为第二中心线17。
将保护层15中线与卷芯结构的卷绕中心线重合，使保护层15位于卷芯结构的卷绕中心线处，如此对正设置，使卷芯结构的保护层15居中设置，并不会因设置保护层15而导致卷芯结构重量配比发生变化。
此外，保护层15中线与卷芯结构的卷绕中心线不重合，保护层15还可以与卷芯结构偏心设置。
一些实施例中，第一集流体11为经电晕处理的集流体。
具体的，涂覆陶瓷层前，先对铝箔做电晕处理，去掉铝箔表面油污，增加箔材表面达因值，减小陶瓷涂层与箔材表面的接触角，增加陶瓷在箔材表面的润湿铺展，做到涂覆陶瓷后不漏箔，陶瓷分布致密；电晕后的铝箔与电晕前相比，结构上无差别，均为卷状铝箔；不同点在于，电晕前后，箔材的达因值有改变；电晕前达因值30，电晕后达因值32。
需要说明的是，在对铝箔进行电晕处理时，优选对涂覆区和未涂覆区的铝箔均进行电晕处理，也可以仅对需要涂覆陶瓷的区域进行电晕处理。电晕处理后陶瓷涂层与箔材表面的接触角减小，增加陶瓷涂层在箔材表面的亲和性，使陶瓷涂层与箔材贴合更紧密。
通过对铝箔做电晕处理，增加陶瓷与铝箔粘接性，进而使陶瓷层与铝箔粘接紧密，提升其粘接的稳定性。
一些实施例中，保护层15的在卷芯结构宽度方向上的涂覆尺寸为卷芯结构宽度的70％至90％。
具体的，请参阅图6，卷芯结构宽度方向的尺寸为图6中B所标引的尺寸，保护层15的在卷芯结构宽度方向上的涂覆尺寸为图6中A所标引的尺寸。
通过将保护层15的在卷芯结构宽度方向上的涂覆尺寸为卷芯结构宽度的70％至90％，并不会增加电池的宽度，且在电芯的厚度方向上仅设置了一层保护层15，对于电池厚度的增加量也较小。
进一步的，保护层15的在卷芯结构宽度方向上的涂覆尺寸为卷芯结构宽度的77％。
在一些具体实施方式中，陶瓷涂覆长度设计值基于电芯宽度，电芯宽度为65mm，陶瓷涂覆长度为50mm，设计原则为：陶瓷层可以有效覆盖卷芯收尾面平面位置，将收尾面保护起来；同时陶瓷涂层不上卷芯两侧圆弧，避免影响成品电芯宽度；陶瓷层涂覆宽度与正极片宽度一致，降低生产加工难度；在正极片尾部，涂膏短的一侧，涂覆一段长度约50mm的陶瓷膜，经过制片卷绕工序，做成卷芯，陶瓷涂层在收尾面尾部空箔下面，卷芯外观右侧看到半折(约15mm宽度)空箔；左侧为陶瓷涂层，陶瓷涂层被收尾空箔盖住15mm左右。收尾空箔未到卷芯正中间位置，收尾收在卷芯偏右侧位置。穿刺测试时，针刺位置为卷芯正中间位置，收尾空箔短，可避开针刺位置，降低因空箔毛刺带来的失效风险。
所述穿刺改善与以往针刺改善不同；以往的针刺改善要求钉子完全穿过电芯，且保持10min不起火、不爆炸；本申请所述穿刺为电芯经过pack制成成品电池，然后装载到手机产品中，带有电芯电池的手机从一定高度做自由跌落，跌落位置对应的下方平面上安装钉子，钉子尖端超上，手机后盖位置朝下。手机跌落下来，手机后盖位置接触钉子尖端，由于重力作用，钉子尖端刺入手机后盖，进而刺入电芯。
电池装机前，先进行了一轮电芯单体跌落穿刺测试，卷芯外层不涂覆陶瓷层的电芯(陶瓷层厚度0μm的电芯)与卷芯外层涂覆10μm陶瓷层的电芯对比测试结果如下：
卷芯外侧有陶瓷层的电芯，跌落穿刺测试通过率明显高于无陶瓷层的电芯；
水系陶瓷+电晕箔材，陶瓷与铝箔粘接性好，装载电芯的电子产品整机滚筒、跌落等安全测试的通过率得以提高，提升产品安全性。
判断粘接性好坏，可以通过拆解电芯，肉眼观察陶瓷层与铝箔是否直接剥离，或者通过手拉判断剥离力的大小；对于剥离力的判断，将陶瓷层通过胶体与铝箔粘接在一起，通过手拉对陶瓷涂层和铝箔剥离，若剥离后的胶体粘连在铝箔上较多则说明陶瓷与铝箔粘接性较好；若剥离后的胶体粘连在铝箔上较少则说明陶瓷与铝箔粘接性较差。
整机滚筒测试条件：0.5m高度滚筒跌落2500次，通过标准为电池跌落后不破损、不漏液、不起火、不爆炸。

水系陶瓷电芯整机跌落测试后，电芯压降在0.0104～0.0112V之间，油系陶瓷电芯整机跌落测试后，电芯压降在0.0149～0.0165V之间，水系陶瓷与箔材粘接性好，电池压降小。
整机跌落测试条件：1m高度5轮+1.2m高度1轮+1.5m高度1轮，通过标准为电池跌落后不破损、不漏液、不起火、不爆炸。
水系陶瓷电芯整机跌落测试后，电芯压降在0.0109～0.0117V之间，油系陶瓷电芯整机跌落测试后，电芯压降在0.0147～0.0175V之间，水系陶瓷与箔材粘接性好，电池压降小。
根据电芯厚度分布，电芯最厚点为极耳金属条位置，收尾空箔裁切位置尽量靠向卷芯右侧圆弧处，做到收尾空箔位置不落在卷芯正中间；这样做的好处在于，穿刺测试的测试点在电芯中心位置，如果收尾空箔在卷芯的正中心(即电芯的正中心)，穿刺测试的钉子尖端扎入电芯时很有可能触碰到收尾空箔裁切位置，裁切位有毛刺，与钉子碰触，增加了短路的概率，使测试失效的风险加大。
收尾空箔继续向卷芯右侧缩短，做到与极耳金属条不重叠，一方面可解决极耳金属条和收尾空箔叠加导致的电芯厚度偏大问题。
另一方面，收尾空箔不能过短，所以收尾空箔过圆弧。当空箔过短时，卷芯收尾热熔胶18贴在卷芯平面上，无法将收尾空箔贴住，卷芯处于松散状态，无法完成后工序的生产。
一些实施例中，请参阅图7，收尾热熔胶18贴胶设计原则：热熔胶18覆盖卷芯表面的面积须≥50％；热熔胶18上端与极耳金属条下端不重叠；两道热熔胶18偏心贴，保证卷芯第二中心线17位置被热熔胶18覆盖。
这里，通过热熔胶18覆盖卷芯表面的面积须≥50％，从而热熔胶18的粘接力，以使密 封后的电池整体的稳定性更好；通过热熔胶18上端与极耳金属条下端不重叠，避免影响电池的厚度；由于在对电芯进行穿刺时，大多对电芯的中心线处进行穿刺，通过两道热熔胶18偏心贴，保证卷芯第二中心线17位置被热熔胶18覆盖，热熔胶18能对被穿刺物体产生缓冲，减缓被穿刺物体的穿刺力，从而起到保护电芯的作用。
此外，第一极片1还可以为负极片，相应的第一集流体11为负极集流体，以铜箔作为第一集流体11的实施方式与上述实施方案类似，再次不在赘述。
一种电子产品，包括上述电池。电子产品由电池带来的有益效果请参见上述内容，在此不再赘述。
卷芯涂覆有保护层15的一侧与电子产品的背面相面对，其中，电子产品的背面指的是背靠电子产品屏幕所在的平面。当尖锐物体刺到屏幕背面的一侧时，一般情况下电子器件的屏幕背部的硬度较小，尖锐物体易刺穿电子器件的背面，直至刺到电子器件的电池，然而本申请将卷芯涂覆有保护层15的一侧靠近电子器件的背面，当尖锐物体刺入时，增加保护层15，延长了尖锐物体进入极片内部的路程，且保护层15硬度较大，保护层15会将尖锐物体的穿刺力分散到电池的其他部位，缓冲尖锐物体刺入卷芯时的瞬间压强，降低内部短路的风险，从而提高了电池的安全性。
提供所公开的方面的以上描述以使本领域的任何技术人员能够做出或者使用本申请。对这些方面的各种修改对于本领域技术人员而言是非常显而易见的，并且在此定义的一般原理可以应用于其他方面而不脱离本申请的范围。因此，本申请不意图被限制到在此示出的方面，而是按照与在此公开的原理和新颖的特征一致的最宽范围。
为了例示和描述的目的已经给出了以上描述。此外，此描述不意图将本申请的实施例限制到在此公开的形式。尽管以上已经讨论了多个示例方面和实施例，但是本领域技术人员将认识到其某些变型、修改、改变、添加和子组合。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换等，均应包含在本申请的保护范围之内。

Claims (18)

  1. 一种电池，其特征在于，包括外壳和卷芯，所述外壳收容所述卷芯，所述外壳包括深坑面和非深坑面，所述卷芯包括第一极片，所述第一极片包括第一集流体，所述第一集流体背离所述卷芯的卷绕中心的一侧设置有涂覆区和未涂覆区，所述涂覆区设置有第一活性物质，所述未涂覆区未设置第一活性物质；
    所述未涂覆区至少部分设置于所述卷芯的卷绕收尾端，至少部分未涂覆区设置有保护层,所述保护层与所述深坑面相面对。
  2. 根据权利要求1所述的电池，其特征在于，所述深坑面包括：第一平直部、第一弯折部和第二弯折部，所述第一平直部与以下弯折部中的至少一个弯折部形成夹角：所述第一弯折部或所述第二弯折部。
  3. 根据权利要求2所述的电池，其特征在于，所述未涂覆区包括：第一平直段、第一弯折段和第二弯折段，所述第一平直段与以下弯折段中的至少一个弯折段形成夹角：所述第一弯折段或所述第二弯折段。
  4. 根据权利要求3所述的电池，其特征在于，所述第一平直段与所述第一平直部相面对；所述第一弯折段与所述第一弯折部相面对；所述第二弯折段与所述第二弯折部相面对；所述保护层涂覆于以下段中的至少一段：所述第一平直段、所述第一弯折段或所述第二弯折段。
  5. 根据权利要求1至4中任一项所述的电池，其特征在于，所述保护层为陶瓷层。
  6. 根据权利要求5所述的电池，其特征在于，所述陶瓷层包括勃姆石，所述勃姆石的粒径包括以下中的至少一种：D10≥0.2μm，1.3μm≥D50≥0.8μm，D90≤4μm或D99≤6μm。
  7. 根据权利要求5或6所述的电池，其特征在于，所述陶瓷层包括勃姆石，所述勃姆石的水份小于或等于1500ppm。
  8. 根据权利要求5至7中任一项所述的电池，其特征在于，所述陶瓷层包括勃姆石，所述勃姆石的pH在6.5至8之间。
  9. 根据权利要求5至8中任一项所述的电池，其特征在于，所述陶瓷层为水系陶瓷层。
  10. 根据权利要求1至9中任一项所述的电池，其特征在于，所述第一极片的收尾端位于所述卷芯的平直区，且靠近所述卷芯的圆弧区设置。
  11. 根据权利要求10所述的电池，其特征在于，所述第一极片的收尾端位于极耳的延长线与所述极耳相邻的弯折区之间。
  12. 根据权利要求10或11所述的电池，其特征在于，所述第一极片的收尾端设置有收尾空箔，所述收尾空箔上设置有至少一道热熔胶，所述至少一道热熔胶覆盖所述卷芯的 表面的面积大于或等于50％，所述至少一道热熔胶中的每道热熔胶的靠近极耳的上端与所述极耳的靠近所述热熔胶的下端不重叠。
  13. 根据权利要求12所述的电池，其特征在于，所述至少一道热熔胶包括两道热熔胶，所述两道热熔胶偏心设置。
  14. 根据权利要求1至13中任一项所述的电池，其特征在于，所述保护层的中线与所述卷芯的卷绕中心线重合。
  15. 根据权利要求1至14中任一项所述的电池，其特征在于，所述第一集流体为经电晕处理的集流体。
  16. 根据权利要求1至15中任一项所述的电池，其特征在于，所述保护层的在所述卷芯的宽度方向上的涂覆尺寸为所述卷芯的宽度的70％至90％。
  17. 根据权利要求1至16中任一项所述的电池，其特征在于，所述第一极片位于远离所述卷芯的卷绕中心的一侧。
  18. 一种电子产品，其特征在于，包括如权利要求1至17中任一项所述的电池，所述卷芯涂覆有保护层的一侧与所述电子产品的背面相面对。
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