WO2019127107A1 - 一种电池 - Google Patents

一种电池 Download PDF

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Publication number
WO2019127107A1
WO2019127107A1 PCT/CN2017/119026 CN2017119026W WO2019127107A1 WO 2019127107 A1 WO2019127107 A1 WO 2019127107A1 CN 2017119026 W CN2017119026 W CN 2017119026W WO 2019127107 A1 WO2019127107 A1 WO 2019127107A1
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WO
WIPO (PCT)
Prior art keywords
seal
edge
battery
point
packaging
Prior art date
Application number
PCT/CN2017/119026
Other languages
English (en)
French (fr)
Inventor
邱慎照
袁铖
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 CN201790000813.8U priority Critical patent/CN209357758U/zh
Priority to EP17936867.5A priority patent/EP3734685B1/en
Priority to PCT/CN2017/119026 priority patent/WO2019127107A1/zh
Priority to US16/197,227 priority patent/US11362363B2/en
Publication of WO2019127107A1 publication Critical patent/WO2019127107A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M10/045—Cells or batteries with folded plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • 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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • 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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/10—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
    • H01M50/531—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
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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 field of battery technology, and in particular to a battery.
  • Lithium-ion batteries are favored by many users because of their high voltage, high specific energy, long cycle life and good safety performance. Polymer lithium-ion batteries maintain the advantages of traditional lithium-ion batteries compared to conventional lithium-ion batteries, while increasing their specific energy and safety. At present, more and more electronic devices use lithium-ion batteries as their power source. With the increase in demand for lithium-ion batteries by lithium-ion batteries, lithium-ion batteries are moving toward high specific energy and high magnification.
  • batteries are usually sealed in a package.
  • the package is usually packaged at the end of the battery core near the ear to form a top seal, and the side of the battery core is packaged to form a side seal.
  • the battery includes a battery 01, a package 02 for packaging the battery 01, and a tab 03 connected to the battery 01.
  • the package 02 includes a first package portion 021 for accommodating the battery 01.
  • the second package portion 022 is formed with the package core 01, and the second package portion 022 includes a top seal 0221 sealed with a tab 03 and two side seals 0222 intersecting the top seal 0221.
  • the side cover 0222 is folded and fixed on the outer side surface of the first packaging portion 0221 to form a folded edge, and the portion where the folded edge protrudes from the end of the battery core 01 is called a folded edge protrusion 0223, and the folded edge protrusion 0223 is perpendicular to the top seal 0221.
  • the height of the direction is relatively high.
  • the user needs to install the components at the end of the battery core 01, and the above-mentioned hemming protrusion 0223 is likely to cause structural interference, resulting in low integration of the user-installed components.
  • the purpose of the embodiment of the present application is to provide a battery to reduce the height of the flange protrusion perpendicular to the top sealing direction, reduce the structural interference between the flange protrusion and the remaining components, and improve the integration degree of the structure when the user uses the battery.
  • Embodiments of the present application provide a battery including a battery core, a packaging bag enclosing the battery core, and a tab connected to the battery core, the packaging bag including a first packaging portion accommodating the battery core And a second package portion formed by encapsulating the battery core, the second package portion including a top seal sealing the tab and two side seals intersecting the top seal, the top seal and the top seal
  • the side seal intersection has a notch structure, and the side seal is folded and fixed to an outer side surface of the first packaging portion along an edge of the side seal adjacent to the first packaging portion.
  • a projected length of an edge of the notch structure in a side direction of the top seal and a width of the side seal satisfy:
  • L is the projection length and W is the width of the side seal.
  • the side seal includes a heat sealing area and an unsealed area which are sequentially disposed away from a side direction of the side seal, and the width of the heat sealing area satisfies:
  • W 1 is the width of the heat seal zone and W is the width of the side seal.
  • the width of the heat sealing zone satisfies:
  • W 1 is the width of the heat seal zone and W is the width of the side seal.
  • the edge of the notch structure includes a diagonal edge or a curved edge.
  • an edge of the notch structure intersects a side of the top seal at a point A, and an edge of the notch structure intersects a side of the side seal at a point B, the point A
  • the angle ⁇ between the line connecting the point B and the side of the top seal satisfies: 125° ⁇ ⁇ ⁇ 145°.
  • the angle ⁇ between the line connecting the point A and the point B and the side of the top seal satisfies: 132° ⁇ ⁇ ⁇ 138°.
  • a side of the second package portion adjacent to the notch structure includes a folded portion, the folded portion is folded and fixed to the second package portion, and the entire folded portion is superposed on the The surface of the second package.
  • an edge of the notch structure intersects a side of the top seal at a point A
  • an edge of the notch structure intersects a side of the side seal at a point B
  • the folded portion After being folded and fixed to the second packaging portion, the angle ⁇ between the line connecting the point A and the point B and the side of the top seal satisfies: 80° ⁇ ⁇ ⁇ 110°.
  • the angle ⁇ between the line connecting the point A and the point B and the side of the top seal satisfies: 87° ⁇ ⁇ ⁇ 93°.
  • the folding line of the folded portion passes through the intersection of the edge of the notch structure and the side of the top seal.
  • the side seal is folded and fixed to the outer side surface of the first packaging portion by a double hemming method.
  • a glue layer is disposed between the double folded edge and the outer side surface of the first packaging portion.
  • the edge of the notch structure of the second packaging portion is provided with a sealing tape.
  • the side edges of the side seals are provided with a sealing tape.
  • the formed second packaging portion has a notch structure, and the notch structure is specifically at the intersection of the top seal and the side seal.
  • the above-described notch structure is exemplified.
  • the notched structure refers to a structure that is cut off at the intersection of the top seal and the side seal. In the finished battery, only the edge of the notched structure is visible.
  • the side seal is folded and fixed to the outer side of the first packaging portion along the edge of the side seal adjacent to the first packaging portion. For example, the side seal may be directly folded and bonded to the first packaging portion.
  • the outer side surface, the notch structure is located above the end of the cell, forming a flange protrusion having a notch structure, and the height perpendicular to the top sealing direction is low.
  • FIG. 1 is a schematic structural view of a battery of the prior art
  • FIG. 2 is a schematic structural view of a battery according to a first embodiment of the present application.
  • FIG. 3 is a partial schematic view of a battery according to a second embodiment of the present application.
  • FIG. 4 is a schematic structural view of a battery according to a third embodiment of the present application.
  • Figure 5 is a partial schematic view showing a battery of a fourth embodiment of the present application.
  • FIG. 6 is a partial schematic view of a battery according to a fifth embodiment of the present application.
  • FIG. 7 is a schematic structural view of a battery according to a sixth embodiment of the present application.
  • FIG. 8 is a partial schematic view of a battery according to a seventh embodiment of the present application.
  • Figure 9 is a partial schematic view showing a battery of an eighth embodiment of the present application.
  • an embodiment of the present application provides a battery including a battery core, a packaging pouch for packaging the battery core, and a tab 3 connected to the battery core, the packaging bag including a first package for accommodating the battery core. And a second package portion formed by the packaged battery core, the second package portion includes a top seal 22 sealed with the tabs 3 and two side seals 23 intersecting the top seal 22, the top seal 22 and the side seal 23 intersecting The notch structure 24, the side seal 23 is folded and fixed to the outer side surface of the first packaging portion along the edge of the side seal 23 adjacent to the first packaging portion.
  • the second package portion formed has a notch structure 24, and the notch structure 24 is located at the intersection of the top seal 22 and the side seal 23.
  • the above-mentioned notch structure 24 is exemplarily described.
  • the notch structure 24 refers to a structure that is cut off at the intersection of the top seal 22 and the side seal 23, in the finished battery. Only the edge 241 of the notch structure can be seen.
  • the side seal 23 is folded and fixed to the outer side surface of the first packaging portion 21 along the edge of the side seal 23 adjacent to the first packaging portion.
  • the side seal 23 can be directly folded and bonded to the first side.
  • the outer side surface of a package portion 21, the notch structure 24 is located above the end of the battery cell 1, forming a flange protrusion 26 having a notch structure 24, and the height perpendicular to the direction of the top seal 22 is lower. .
  • the structural interference between the flange protrusions 26 and the components used in combination can be reduced, and the compactness and integration of the structure when the user uses the battery can be improved.
  • the forming process of the notch structure is not limited.
  • the chamfering operation may be performed on the packaging film before forming the packaging bag, the notch structure may be cut off, and the packaging film may be packaged to form a packaging bag; or the packaging bag may be completed.
  • the notch structure is removed; or after the packaging bag completes the packaging process, the notch structure is removed.
  • the “top seal side 221" referred to in the present application refers to the edge of the package in the direction of the top seal 22, and the “side seal side edge 231" refers to the package bag.
  • the “edge 241 of the notched structure” refers to the edge of the package in the direction of the notch structure 24.
  • the shortest distance between the edge 241 of the notch structure and the edge adjacent to the side seal 23 and the first package portion is not less than the set distance.
  • the set distance refers to a seal width that ensures that the package can effectively encapsulate the battery core
  • the seal width refers to the outer edge of the second package portion and the edge adjacent to the second package portion and the first package portion. the distance.
  • the greater the width of the seal the better the safety of the packaged battery, and the less likely it is to open the seal.
  • the sealing width of the battery is at least the sealing width of the effective packaging battery, so as to ensure the quality of the battery and prevent the liquid in the battery packaging bag from flowing out, resulting in damage or failure of the battery.
  • the seal width of the corresponding effective package cells is also different.
  • the set distance in the embodiment of the present application needs to be determined according to the specifications of the time product.
  • the projected length of the edge 241 of the notch structure in the direction of the side edge 221 of the top seal and the width of the side seal 23 satisfy:
  • the size of the top seal 22 may be constant, which is advantageous for the notch structure 24 in the embodiment.
  • the user assembles the remaining parts when using the above battery.
  • 26 is at a height perpendicular to the direction of the top seal 22.
  • the side seal 23 includes a heat seal area and an unsealed area which are sequentially disposed in a direction away from the side edge 231 of the side seal.
  • the width of the heat seal area satisfies:
  • W 1 is the width of the heat seal zone and W is the width of the side seal 23 .
  • the width of the heat sealing zone needs to be not less than the sealing width of the packaging bag capable of effectively encapsulating the battery core. According to the analysis by the inventor, when the width of the sealing zone reaches one-fifth of the width of the side sealing, The seal width requirement can be met. In addition, the larger the width of the heat sealing zone, the better the sealing effect of the battery and the safety performance of the battery. However, due to the limitation of the thickness of the cell, the heat seal area cannot be too large.
  • the width of the heat seal area satisfies:
  • W 1 is the width of the heat seal zone and W is the width of the side seal 23 .
  • the heat sealing zone may have a width of 0.7 mm to 1.3 mm, and may be, for example, 0.8 mm, 0.85 mm, 0.9 mm, 1.0 mm, 1.1 mm, or 1.2 mm.
  • the width of the sealing zone is two-fifth of the width of the side sealing, the sealing width of the above-mentioned effective packaging cell can be satisfied, and the process of subsequent folding and the like can be performed, and the cost and the volume and weight of the battery can be reduced.
  • the shape of the edge 241 of the notch structure is not specifically limited, and may be a diagonal edge or a curved edge.
  • the notch structure 24 having a diagonal line edge is convenient for fabrication; the shape of the curved edge may be consistent with the shape of the corresponding cell edge.
  • the shortest distance between the edge 241 of the notch structure and the first package portion 21 is not less than Under the condition of a fixed distance, the size of the notch structure 24 can be designed to be large, which is advantageous for further reducing the height of the flange protrusion 26 perpendicular to the direction of the top seal 22.
  • the edge 241 of the notched structure intersects the side edge 221 of the top seal at point A, and the edge 241 of the notched structure intersects the side edge 231 of the side seal at point B, point A and point.
  • the angle ⁇ between the line B and the side edge 221 of the top seal satisfies: 125° ⁇ ⁇ ⁇ 145°.
  • the direction of the side of the top seal 22 and the side of the side seal 23 in the direction of the side of the top seal 22 can be made relatively close, at the edge of the edge 241 of the notch structure and the edge of the side seal 23 and the first package.
  • the shortest distance is not less than the set distance, that is, under the premise that the package 2 is effectively packaged, it may have a larger notch structure 24, which is advantageous for reducing the height of the flange protrusion 26 perpendicular to the direction of the top seal 22.
  • the angle ⁇ between the line connecting point A and point B and the side edge 221 of the top seal satisfies: 132° ⁇ ⁇ ⁇ 138°.
  • the direction of the side of the top seal 22 and the direction of the side of the side seal 23 are more uniform.
  • ⁇ 145°
  • the direction of the notch structure 24 in the side of the top seal 22 and the direction of the side of the side seal 23 are equal.
  • the side of the second package portion adjacent to the notch structure 24 includes a folded portion 25 , the folded portion 25 is folded and fixed to the second package portion, and the entire folded portion 25 is stacked on the second portion.
  • the surface of the packaging is not limited to FIG. 7 and FIG. 8 .
  • the second packaging portion includes the folding portion 25.
  • the folded second packaging portion generates a larger notch, and the side cover 23 is folded and fixed to the outer side of the first packaging portion 21, and the folded portion is folded.
  • the protrusion 26 is further reduced in height perpendicular to the direction of the top seal 22; on the other hand, the edge 241 of the notch structure has a bare seal opening, the bare seal opening is easy to open, and the folded portion 25 is folded and fixed to the second package portion.
  • the above sealing port can be protected from being easily opened, which is advantageous for improving the sealing effect of the packaged battery core 1 of the packaging bag 2, and is not easy to cause opening damage.
  • the folded portion 25 is folded and fixed to the second packaging portion and the entire folded portion 25 is superposed on the surface of the second packaging portion, which means that the folded portion 25 is folded and fixed only to the second packaging portion, and the packaging bag 2 is
  • the first packaging portion 21 has no structural interference, and the flatness of the folded portion 25 of the packaging bag 2 can be improved, so that the packaging bag 2 is not easily opened and damaged.
  • the edge 241 of the notch structure intersects the side edge 221 of the top seal at point A
  • the edge 241 of the notch structure intersects the side edge 231 of the side seal at point B
  • the folded portion 25 is folded and fixed to the second package portion.
  • the angle ⁇ between the line connecting the point A and the point B and the side edge 221 of the top seal satisfies: 80° ⁇ ⁇ ⁇ 110°.
  • the relationship between the line connecting the point A and the point B and the side edge 221 of the top seal is close to the vertical relationship when the folded portion 25 is folded, and the folding can be reduced when the side cover 23 is fixed to the outer side surface of the first package portion 21.
  • the portion 25 interferes with the structure of the first package portion 21.
  • the area of the folded portion 25 can be made larger, thereby further reducing the height of the folded portion.
  • the angle ⁇ between the line connecting point A and point B and the side edge 221 of the top seal satisfies: 87° ⁇ ⁇ ⁇ 93°. After the folded portion 25 is folded, the line connecting the point A and the point B is closer to the vertical relationship with the side edge 221 of the top seal.
  • the fold line of the fold 25 passes through the intersection A of the edge 241 of the notch structure and the side edge of the top seal 22.
  • the folded portion 25 is folded from the intersection of the edge 241 of the notch structure and the side of the top seal 22 as the starting point of the folding line, and the gap size at the intersection of the top seal 22 and the side seal 23 can be further improved, in the side seal 23
  • the height of the flange protrusion 26 in the direction perpendicular to the top seal 22 can be further lowered.
  • the edge 241 of the notch structure is a diagonal line edge
  • the angle ⁇ between the oblique line edge and the side edge 221 of the top seal is 135°
  • the folded portion is folded along the folding line passing through the point A
  • the angle ⁇ between the oblique edge and the side edge 221 of the top seal is 90°.
  • the side cover 23 is folded and fixed to the outer side surface of the first packaging portion by means of a double folded edge 224.
  • the above-mentioned double-folding method means that the side edge of the side seal 23 is folded once along the folding line toward the battery core 1 along the first folding line 232, and then folded along the edge of the side seal 23 close to the first packaging portion 21 to be fixed.
  • the sealing opening on the side of the side seal 23 can be wrapped on the inner side to protect the sealing opening from opening, which is beneficial to improve the sealing effect of the packaging core 1 of the packaging bag 2, and is not easy to be opened and damaged.
  • the first folding line 232 is located in the heat sealing zone, and the heat sealing zone has high strength. This solution can reduce the damage of the packaging bag due to folding and improve the safety performance of the packaging bag.
  • a glue layer is disposed between the double hem and the outer side surface of the first package portion, that is, the double hem is fixed to the outer side surface of the first package portion by bonding.
  • the edge 241 of the notched structure of the second package portion is provided with a sealing tape.
  • the side edges 231 of the side seals are provided with a sealing tape. After the package is packaged, the edge has a bare seal, and the exposed seal is easy to open, causing leakage of the battery and the like, and the service life of the battery is lowered. Therefore, the embodiment can protect the sealing opening from opening, and improve the sealing effect of the packaging bag, thereby improving the service life of the battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

一种电池，该电池包括电芯（1）、封装电芯（1）的包装袋（2）和与电芯（1）连接的极耳（3），包装袋（2）包括容纳电芯（1）的第一包装部（21），和封装电芯（1）形成的第二包装部，第二包装部包括封印有极耳（3）的顶封（22）和与顶封（22）相交的两个侧封（23），顶封（22）与侧封（23）相交处具有缺口结构（24），侧封（23）沿侧封（23）与第一包装部（21）相邻的边缘翻折固定于第一包装部（21）的外侧面。所述电池以降低折边凸起（26）垂直于顶封（22）的方向的高度，减少折边凸起（26）与其余零部件间的结构干涉，提高用户使用电池时结构的紧凑性。

Description

一种电池 技术领域
本申请涉及电池技术领域，特别是涉及一种电池。
背景技术
锂离子电池具有电压高，比能量大、循环寿命长、安全性能好等优点，因而受到很多用户青睐。聚合物锂离子电池相比传统的锂离子电池来说保持了传统锂离子电池的优点，同时提高了其比能量及安全性能。目前，越来越多的电子设备采用装锂离子电池作为其电源，随着用电设备对锂离子电池要求的提升，锂离子电池向着高比能量和高倍率方向发展。
对于电池来说，电芯通常采用包装袋进行密封包装。在电池制造过程中，通常将包装袋在电芯靠近极耳方向的端部封装形成顶封，在电芯两侧封装形成侧封。
请参考图1，现有技术中，电池包括电芯01、封装电芯01的包装袋02和与电芯01连接的极耳03，包装袋02包括容纳电芯01的第一包装部021，和封装电芯01形成的第二包装部022，第二包装部022包括封印有极耳03的顶封0221和与顶封0221相交的两个侧封0222。将侧封0222翻折固定于第一包装部0221的外侧面形成折边，折边凸出电芯01端部的部位称为折边凸起0223，折边凸起0223垂直于顶封0221的方向的高度较高，在用户使用时，用户需要在电芯01端部安装零部件，与上述折边凸起0223容易产生结构干涉，导致用户安装零部件的集成度较低。
发明内容
本申请实施例的目的是提供一种电池，以降低折边凸起垂直于顶封方向的高度，减少折边凸起与其余零部件间的结构干涉，提高用户使用电池时结构的集成度。
本申请实施例提供了一种电池，该电池包括电芯、封装所述电芯的包装袋和与所述电芯连接的极耳，所述包装袋包括容纳所述电芯的第一包装部，和封装所述电芯形成的第二包装部，所述第二包装部包括封印有所述极耳的顶封和与所述顶封相交的两个侧封，所述顶封与所述侧封相交处具有缺口结 构，所述侧封沿所述侧封与所述第一包装部相邻的边缘翻折固定于所述第一包装部的外侧面。
本申请一具体实施例中，所述缺口结构的边缘在所述顶封的侧边方向的投影长度与所述侧封的宽度满足：
L≤W；
其中，L为所述投影长度，W为所述侧封的宽度。
本申请一具体实施例中，所述侧封包括沿远离所述侧封的侧边方向依次设置的热封区和未封区，所述热封区的宽度满足：
1/5W≤W 1≤4/5W；
其中，W 1为所述热封区的宽度，W为所述侧封的宽度。
本申请一具体实施例中，所述热封区的宽度满足：
W 1＝2/5W；
其中，W 1为所述热封区的宽度，W为所述侧封的宽度。
本申请一具体实施例中，所述缺口结构的边缘包括斜线边缘或者曲线边缘。
本申请一具体实施例中，所述缺口结构的边缘与所述顶封的侧边相交于点A，所述缺口结构的边缘与所述侧封的侧边相交于点B，所述点A与所述点B的连线与所述顶封的侧边的夹角α满足：125°≤α≤145°。
本申请一具体实施例中，所述点A与所述点B的连线与所述顶封的侧边的夹角α满足：132°≤α≤138°。
本申请一具体实施例中，所述第二包装部靠近所述缺口结构的一侧包括折叠部，所述折叠部折叠固定于所述第二包装部且整个所述折叠部叠置于所述第二包装部表面。
本申请一具体实施例中，所述缺口结构的边缘与所述顶封的侧边相交于点A，所述缺口结构的边缘与所述侧封的侧边相交于点B，所述折叠部折叠固定于所述第二包装部后，所述点A与所述点B的连线与所述顶封的侧边的夹角β满足：80°≤β≤110°。
本申请一具体实施例中，所述点A与所述点B的连线与所述顶封的侧边的夹角β满足：87°≤β≤93°。
本申请一具体实施例中，所述折叠部的折叠线穿过所述缺口结构的边缘与所述顶封的侧边的交点。
本申请一具体实施例中，所述侧封采用双折边方式翻折固定于所述第一包装部的外侧面。
本申请一具体实施例中，所述双折边和所述第一包装部的外侧面之间设置有胶层。
本申请一具体实施例中，所述第二包装部的缺口结构的边缘设置有密封胶带。
本申请一具体实施例中，所述侧封的侧边设置有密封胶带。
本申请实施例中，电池的包装袋封装电芯后，形成的第二包装部具有缺口结构，具体的该缺口结构于顶封与侧封的相交处。一个具体的实施例中，对上述缺口结构做出示例性的说明，缺口结构指的是在顶封与侧封的相交处切除掉的结构，在电池成品中，仅可见缺口结构的边缘。在制作电池时，侧封沿侧封与第一包装部相邻的边缘翻折固定于第一包装部的外侧面，例如，可以将侧封直接翻折，并粘接于第一包装部的外侧面，则缺口结构位于电芯端部的上方，形成折边凸起，该折边凸起具有缺口结构，则垂直于顶封方向的高度较低。使用该电池时，可以减少折边凸起与配合使用的零部件间的结构干涉，提高用户使用电池时结构的紧凑性和集成度。
附图说明
为了更清楚地说明本公开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一简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术的一种电池结构示意图；
图2为本申请第一实施例电池结构示意图；
图3为本申请第二实施例电池的局部示意图；
图4为本申请第三实施例电池结构示意图；
图5为本申请第四实施例电池的局部示意图；
图6为本申请第五实施例电池的局部示意图；
图7为本申请第六实施例电池结构示意图；
图8为本申请第七实施例电池的局部示意图；
图9为本申请第八实施例电池的局部示意图。
附图标记：
现有技术部分：
01-电芯；                     02-包装袋；
021-第一包装部；              022-第二包装部；
0221-顶封；                   0222-侧封；
0223-折边凸起；               03-极耳；
本申请部分：
1-电芯；                      2-包装袋；
21-第一包装部；               22-顶封；
221-顶封的侧边；              23-侧封；
231-侧封的侧边；              232-第一折叠线；
24-缺口结构；                 241-缺口结构的边缘；
25-折叠部；                   26-折边凸起；
3-极耳。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
请参考图2至图4，本申请实施例提供了一种电池，该电池包括电芯、封装电芯的包装袋和与电芯连接的极耳3，包装袋包括容纳电芯的第一包装部，和封装电芯形成的第二包装部，第二包装部包括封印有极耳3的顶封22和与顶封22相交的两个侧封23，顶封22与侧封23相交处具有缺口结构24，侧封23沿侧封23与第一包装部相邻的边缘翻折固定于第一包装部的外侧面。
本申请实施例中，电池的包装袋2封装电芯1后，形成的第二包装部具有缺口结构24，具体的该缺口结构24位于顶封22与侧封23的相交处。请参考图2，为一个具体的实施例，对上述缺口结构24做出示例性的说明，缺口结构24指的是在顶封22与侧封23的相交处切除掉的结构，在电池成品中，仅可见缺口结构的边缘241。
在制作电池时，侧封23沿侧封23与第一包装部相邻的边缘翻折固定于第一包装部21的外侧面，例如，可以将侧封23直接翻折，并粘接于第一包装部21的外侧面，则缺口结构24位于电芯1端部的上方，形成折边凸起26，该折边凸起26具有缺口结构24，则垂直于顶封22方向的高度较低。使用该电池时，可以减少折边凸起26与配合使用的零部件间的结构干涉，提高用户使用电池时结构的紧凑性和集成度。
具体的实施例中，缺口结构的形成过程不做限制，例如，可以在形成包装袋之前的包装膜上进行切角操作，切除缺口结构，再封装包装膜形成包装袋；也可以在完成包装袋的压合工艺后，切除缺口结构；或者包装袋完成封装工艺后，再切除缺口结构。
值的说明的是，请参考图3，本申请提到的“顶封的侧边221”指的是包装袋在顶封22方向的边缘，“侧封的侧边231”指的是包装袋在侧封23方向的边缘，“缺口结构的边缘241”指的是包装袋在缺口结构24方向的边缘。
值的注意的是，本申请的实施例中，缺口结构的边缘241与侧封23和第一包装部相邻的边缘的最短距离不小于设定距离。具体的，上述设定距离指的是保证包装袋能够有效封装电芯的封印宽度，封印宽度指的是第二包装部的外侧边缘与第二包装部和第一包装部相邻的边缘之间的距离。封印宽度越大，包装袋封装电芯的安全性越好，越不容易出现开封缺陷。电池的封印宽度至少达到有效封装电芯的封印宽度，才能够保证电池的质量，防止电芯包装袋内的液体流出，导致电池损坏或者失效的情况。不同规格的电池，对应的有效封装电芯的封印宽度也不同，本申请实施例中的设定距离需要根据时间产品的规格来确定。
请参考图3，优选的实施例中，缺口结构的边缘241在顶封的侧边221方向的投影长度与侧封23的宽度满足：
L≤W；
其中，L为投影长度，W为侧封23的宽度。
请继续参考图3，优选的实施例中，该实施例中的缺口结构24，在侧封23翻折固定于第一包装部21的外侧面后，顶封22的尺寸可以不变，有利于用户使用上述电池时装配其余部件。一个具体的实施例中，缺口结构的边缘241在顶封22的侧边方向的投影长度等于侧封23的宽度，即L＝W，该实施例还可以在较大程度上降低折边凸起26在垂直于顶封22方向的高度。
请参考图5，侧封23包括沿远离侧封的侧边231方向依次设置的热封区和未封区，热封区的宽度满足：
1/5W≤W 1≤4/5W；
其中，W 1为热封区的宽度，W为侧封23的宽度。
在具体的实施例中，热封区的宽度需要不小于保证包装袋能够有效封装电芯的封印宽度，通过发明人的分析计算，当封印区的宽度达到侧封宽度的五分之一时，即可满足对封印宽度的要求。此外，热封区的宽度越大越可以提高电池的封印效果，提高电池的安全性能。但是，由于受到电芯厚度的限制，热封区不能过大。
一个优选的实施例中，热封区的宽度满足：
W 1＝2/5W；
其中，W 1为热封区的宽度，W为侧封23的宽度。
具体的，热封区的宽度可以为0.7mm～1.3mm，例如，可以为0.8mm、0.85mm、0.9mm、1.0mm、1.1mm或1.2mm。当封印区的宽度为侧封宽度的五分之二时，既可以满足上述有效封装电芯的封印宽度，又足够进行后续折边等工艺，且可以节约成本，降低电池的体积及重量。
请参考图5和图6，可选的实施例中，缺口结构的边缘241形状不做具体限定，可以为斜线边缘，也可以为曲线边缘。其中，具有斜线边缘的缺口结构24便于制作；曲线边缘的形状可以与对应的电芯边缘形状一致，该实施例中，在缺口结构的边缘241与第一包装部21的最短距离不小于设定距离的条件下，缺口结构24的尺寸可以设计的较大，有利于进一步降低折边凸起26垂直于顶封22方向的高度。
请继续参考图3，优选的实施例中，缺口结构的边缘241与顶封的侧边221相交于点A，缺口结构的边缘241与侧封的侧边231相交于点B，点A与点B的连线与顶封的侧边221的夹角α满足：125°≤α≤145°。
该实施例中，可以使缺口结构24在顶封22侧边的方向和侧封23侧边的方向尺寸较为接近，在保证缺口结构的边缘241与侧封23和第一包装部相邻的边缘的最短距离不小于设定距离，即包装袋2有效封装的前提下，可以具有较大的缺口结构24，有利于降低折边凸起26垂直于顶封22方向的高度。
更优的实施例中，点A与点B的连线与顶封的侧边221的夹角α满足：132°≤α≤138°。该实施例中，缺口结构24在顶封22侧边的方向和侧封23侧 边的方向尺寸更为一致。例如，具体的实施例中，α＝145°，则缺口结构24在顶封22侧边的方向和侧封23侧边的方向尺寸相等。
请参考图7和图8，具体的实施例中，第二包装部靠近缺口结构24的一侧包括折叠部25，折叠部25折叠固定于第二包装部且整个折叠部25叠置于第二包装部表面。
该实施例中，第二包装部包括折叠部25，一方面，折叠后的第二包装部会产生更大的缺口，在侧封23翻折固定于第一包装部21的外侧面后，折边凸起26在垂直于顶封22方向的高度进一步降低；另一方面，缺口结构的边缘241处具有裸露的封印口，裸露的封印口易于开封，折叠部25折叠固定于第二包装部后，可以保护上述封印口不易开封，有利于提高包装袋2封装电芯1的封印效果，不易出现开封损坏。具体的，折叠部25折叠固定于第二包装部且整个折叠部25叠置于第二包装部表面，指的是，折叠部25折叠后仅固定于第二包装部，而与包装袋2的第一包装部21部分无结构干涉，可以提高包装袋2的折叠部25的平整度，使包装袋2不易开封损坏。
请参考图8，缺口结构的边缘241与顶封的侧边221相交于点A，缺口结构的边缘241与侧封的侧边231相交于点B，折叠部25折叠固定于第二包装部后，点A与点B的连线与顶封的侧边221的夹角β满足：80°≤β≤110°。
该实施例中，折叠部25折叠后点A与点B的连线与顶封的侧边221接近垂直的关系，则在侧封23固定于第一包装部21的外侧面时，可以减少折叠部25与第一包装部21结构干涉。此外，可以使折叠部25的面积较大，从而进一步的降低折边凸起的高度。更优的实施例中，点A与点B的连线与顶封的侧边221的夹角β满足：87°≤β≤93°。使折叠部25折叠后点A与点B的连线与顶封的侧边221更加接近垂直的关系。
请继续参考图9，具体的实施例中，折叠部25的折叠线穿过缺口结构的边缘241与顶封22的侧边的交点A。该实施例中，折叠部25从缺口结构的边缘241与顶封22侧边的交点为折叠线的起点折叠，可以进一步的提高顶封22与侧封23相交处的缺口尺寸，在侧封23翻折固定于第一包装部21的外侧面后，折边凸起26在垂直于顶封22方向的高度可以进一步降低。
本申请一个优选的方案为，缺口结构的边缘241为斜线边缘，斜线边缘与顶封的侧边221的夹角α为135°，且折叠部沿穿过A点的折叠线折叠后，斜线边缘与顶封的侧边221的夹角β为90°。在满足有效封印的前提下，可 以最大程度上降到折边凸起的高度。
请参考图4和图5，侧封23采用双折边224方式翻折固定于第一包装部的外侧面。上述双折边方式指的是侧封23的侧边沿折叠线向靠近电芯1的方向沿第一折叠线232折叠一次，再沿侧封23靠近第一包装部21的边缘翻折固定于第一包装部21的外侧面。该实施例中，可以将侧封23侧边裸露的封印口包裹在内侧，保护上述封印口不易开封，有利于提高包装袋2封装电芯1的封印效果，不易开封损坏。
优选的实施例中，第一折叠线232位于热封区内，热封区的强度较高，该方案可以减少由于折叠导致包装袋损坏，提高包装袋的安全性能。
具体的实施例中，双折边和第一包装部的外侧面之间设置有胶层，即双折边通过粘接的方式固定于第一包装部的外侧面。
具体的实施例中，第二包装部的缺口结构的边缘241设置有密封胶带。此外，侧封的侧边231设置有密封胶带。包装袋封装后，边缘具有裸露的封印口，裸露的封印口易于开封，导致电池出现漏液等损坏的现象，使电池的使用寿命降低。因此，该实施例可以保护上述封印口不易开封，提高包装袋的封印效果，进而提高电池的使用寿命。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (15)

  1. 一种电池，其特征在于，包括电芯、封装所述电芯的包装袋和与所述电芯连接的极耳，所述包装袋包括容纳所述电芯的第一包装部，和封装所述电芯形成的第二包装部，所述第二包装部包括封印有所述极耳的顶封和与所述顶封相交的两个侧封，所述顶封与所述侧封相交处具有缺口结构，所述侧封沿所述侧封与所述第一包装部相邻的边缘翻折固定于所述第一包装部的外侧面。
  2. 如权利要求1所述的电池，其特征在于，所述缺口结构的边缘在所述顶封的侧边方向的投影长度与所述侧封的宽度满足：
    L≤W；
    其中，L为所述投影长度，W为所述侧封的宽度。
  3. 如权利要求1所述的电池，其特征在于，所述侧封包括沿远离所述侧封的侧边方向依次设置的热封区和未封区，所述热封区的宽度满足：
    1/5W≤W 1≤4/5W；
    其中，W 1为所述热封区的宽度，W为所述侧封的宽度。
  4. 如权利要求3所述的电池，其特征在于，所述热封区的宽度满足：
    W 1＝2/5W；
    其中，W 1为所述热封区的宽度，W为所述侧封的宽度。
  5. 如权利要求1所述的电池，其特征在于，所述缺口结构的边缘包括斜线边缘或者曲线边缘。
  6. 如权利要求1所述的电池，其特征在于，所述缺口结构的边缘与所述顶封的侧边相交于点A，所述缺口结构的边缘与所述侧封的侧边相交于点B，所述点A与所述点B的连线与所述顶封的侧边的夹角α满足：125°≤α≤145°。
  7. 如权利要求6所述的电池，其特征在于，所述点A与所述点B的连线与所述顶封的侧边的夹角α满足：132°≤α≤138°。
  8. 如权利要求1所述的电池，其特征在于，所述第二包装部靠近所述缺口结构的一侧包括折叠部，所述折叠部折叠固定于所述第二包装部且整个所述折叠部叠置于所述第二包装部表面。
  9. 如权利要求8所述的电池，其特征在于，所述缺口结构的边缘与所述顶封的侧边相交于点A，所述缺口结构的边缘与所述侧封的侧边相交于点B， 所述折叠部折叠固定于所述第二包装部后，所述点A与所述点B的连线与所述顶封的侧边的夹角β满足：80°≤β≤110°。
  10. 如权利要求9所述的电池，其特征在于，所述点A与所述点B的连线与所述顶封的侧边的夹角β满足：87°≤β≤93°。
  11. 如权利要求8所述的电池，其特征在于，所述折叠部的折叠线穿过所述缺口结构的边缘与所述顶封的侧边的交点。
  12. 如权利要求1所述的电池，其特征在于，所述侧封采用双折边方式翻折固定于所述第一包装部的外侧面。
  13. 如权利要求12所述的电池，其特征在于，所述双折边和所述第一包装部的外侧面之间设置有胶层。
  14. 如权利要求1所述的电池，其特征在于，所述第二包装部的缺口结构的边缘设置有密封胶带。
  15. 如权利要求1所述的电池，其特征在于，所述侧封的侧边设置有密封胶带。
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