WO2022184081A1 - 电池 - Google Patents

电池 Download PDF

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Publication number
WO2022184081A1
WO2022184081A1 PCT/CN2022/078736 CN2022078736W WO2022184081A1 WO 2022184081 A1 WO2022184081 A1 WO 2022184081A1 CN 2022078736 W CN2022078736 W CN 2022078736W WO 2022184081 A1 WO2022184081 A1 WO 2022184081A1
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WO
WIPO (PCT)
Prior art keywords
groove
annular
liquid injection
metal sheet
battery
Prior art date
Application number
PCT/CN2022/078736
Other languages
English (en)
French (fr)
Inventor
卫志达
彭宁
谢斌
Original Assignee
珠海冠宇电池股份有限公司
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
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Application filed by 珠海冠宇电池股份有限公司 filed Critical 珠海冠宇电池股份有限公司
Publication of WO2022184081A1 publication Critical patent/WO2022184081A1/zh

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147Lids or covers
    • H01M50/148Lids or covers characterised by their shape
    • H01M50/152Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/531Electrode connections inside a battery casing
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627Filling ports

Definitions

  • the utility model relates to the technical field of batteries, in particular to a battery.
  • Batteries are divided into two categories: chemical batteries and physical batteries. Among them, chemical batteries are the most widely used, mainly composed of anode, cathode and electrolyte.
  • Commonly used batteries such as button batteries, mainly include a casing and a cell enclosed in the casing.
  • the casing usually includes a casing and a top cover that are insulated from each other.
  • the top cover is usually connected to the first tab of the cell, and the casing is usually connected to the cell. the second tab connection.
  • a liquid injection hole is usually provided on the top cover. After the electrolyte injection is completed, a sealing cover is used to seal the liquid injection hole.
  • the utility model provides a battery, which improves the setting effect of a liquid injection hole and a sealing cover, and is beneficial to improve the yield of the button battery.
  • the utility model provides a battery, comprising a battery core assembly and a casing assembly, the casing assembly includes a casing and a top cover, the casing and the top cover are enclosed into an accommodating cavity, and the accommodating cavity is used for accommodating the battery core assembly; the casing includes a bottom wall and an annular side wall that are connected to each other, the bottom wall and the top cover are respectively located at two ends of the annular side wall; The liquid injection hole is welded with a sealing cover for sealing the liquid injection hole.
  • the battery of the present invention includes a cell assembly and a shell assembly.
  • the shell assembly includes a shell and a top cover.
  • the shell and the top cover form an accommodating cavity, and the accommodating cavity is used for accommodating the cell assembly.
  • the cell assembly can pass through the shell.
  • the component outputs electrical energy to the outside, or the battery core component can receive electrical energy input from the outside through the housing component.
  • the casing includes a bottom wall and an annular side wall which are connected to each other, and the bottom wall and the top cover are respectively located at two ends of the annular side wall.
  • the bottom wall is provided with a liquid injection hole, and a sealing cover for sealing the liquid injection hole is welded at the liquid injection hole.
  • the bottom wall of the shell has less associated structure, simpler overall structure and larger space, which not only facilitates the setting of the liquid injection hole, but also facilitates the subsequent welding of the sealing cover, which is conducive to the lifting of the sealing cover.
  • the welding effect of the battery is improved, which is beneficial to improve the yield of the battery and reduce the difficulty of the processing and manufacturing process of the battery.
  • the second metal sheet is usually an aluminum alloy sheet, the welding performance of the aluminum alloy is relatively poor, and the shell is usually a steel shell, and the welding performance of the steel is relatively good.
  • the bottom wall is beneficial to improve the effect of welding and sealing the liquid injection hole of the sealing cover, thereby helping to reduce the probability of liquid leakage of the battery, thereby helping to improve the yield of the battery.
  • the top cover includes a first metal sheet with a through hole, an insulating seal and a second metal sheet, the first metal sheet is connected to one end of the annular side wall, so The second metal sheet is connected to the first metal sheet through the insulating seal and covers the through hole;
  • the battery core assembly has a first tab and a second tab, the first tab Contrary to the electrical properties of the second tab, the first tab is connected to the second metal sheet, and the second tab is connected to the housing or the first metal sheet;
  • an accommodating groove is provided on the outer surface of the bottom wall, the liquid injection hole is provided at the bottom of the accommodating groove, and the diameter of the liquid injection hole is smaller than that of the The diameter of the accommodating groove; the sealing cover is located in the accommodating groove, and the diameter of the sealing cover is smaller than the diameter of the accommodating groove and larger than the diameter of the liquid injection hole.
  • the difference between the diameter of the accommodating groove and the diameter of the liquid injection hole is greater than or equal to 0.05 mm.
  • the difference between the diameter of the accommodating groove and the diameter of the sealing cover is in the range of 0.01mm-2.5mm.
  • the depth of the accommodating groove ranges from 0.01mm to 0.15mm.
  • the battery core assembly is a winding type battery core
  • the middle part of the winding type battery core has a shaft hole
  • the liquid injection hole and the shaft hole are on the bottom wall The projections on at least partially overlap.
  • the edge of the sealing cover is connected to the inner wall of the accommodating groove by welding to form a first welding seam.
  • the edge of the sealing cover and the inner wall of the accommodating groove there is a gap between the edge of the sealing cover and the inner wall of the accommodating groove, and the first welding seam fills at least part of the gap.
  • a molten pool depression is formed on the surface of the first welding seam, and the depth of the molten pool depression ranges from 0.005 mm to 0.05 mm.
  • the thickness of the sealing cover is less than or equal to the depth of the accommodating groove.
  • the central area of the sealing cover protrudes in a direction away from the liquid injection hole; the height range of the outer surface of the sealing cover protruding from the outer surface of the bottom wall is 0.02mm-2mm; and/or, the height of the inner surface of the sealing cover protruding from the groove bottom of the accommodating groove ranges from 0.01mm to 0.05mm.
  • the hole wall of the liquid injection hole is set to an arc angle at one end close to the cell assembly; and/or, the hole wall of the liquid injection hole is far away from the cell assembly one end is set as a rounded corner.
  • the casing is a steel casing
  • the second metal sheet is an aluminum alloy sheet
  • annular stepped groove is provided at the top end of the inner wall of the annular side wall, and the outer diameter of the annular stepped groove is smaller than the outer diameter of the annular side wall; the outer circumference of the first metal sheet is The edge is located in the annular stepped groove, and the outer peripheral edge of the first metal sheet is welded and connected with the inner wall of the annular stepped groove to form a second welding seam.
  • the annular side wall and the annular stepped groove are arranged coaxially, and the difference between the outer diameter of the annular side wall and the outer diameter of the annular stepped groove is 0.1 mm -0.18mm.
  • the outer peripheral edge of the insulating sealing member is formed with a first insulating protrusion that shields the outer peripheral edge of the second metal sheet.
  • the inner peripheral edge of the insulating sealing member is formed with a second insulating protrusion that shields the inner edge of the first metal sheet.
  • the outer surface or the inner surface of the second metal sheet is provided with a first annular groove, and the thickness of the groove bottom of the first annular groove is smaller than the thickness of the first metal sheet. thickness.
  • the outer surface or the inner surface of the bottom wall is provided with a second annular groove, and the thickness of the groove bottom of the second annular groove is smaller than the thickness of the bottom wall.
  • the first annular groove includes a first outer annular groove and a first inner annular groove
  • the first inner annular groove is provided in the first outer annular groove the groove bottom, and the notch width of the first inner ring groove is smaller than the notch width of the first outer ring groove.
  • the second annular groove includes a second outer annular groove and a second inner annular groove, and the second inner annular groove is provided in the second outer annular groove the groove bottom, and the notch width of the second inner ring groove is smaller than the notch width of the second outer ring groove.
  • the minimum thickness of the groove bottom of the first annular groove ranges from 0.02 mm to 0.1 mm.
  • the first annular groove is coaxially disposed with the casing.
  • the second annular groove is coaxial with the casing.
  • the second tab is welded and connected to the bottom wall to form at least one solder print; ear protection glue, the second tab protection glue covers the solder print; the area corresponding to the solder print on the outer surface of the bottom wall has no solder print.
  • FIG. 1 is a cross-sectional view 1 of a battery provided by an embodiment of the present invention.
  • FIG. 2 is a second cross-sectional view of a battery according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view 3 of a battery according to an embodiment of the present invention.
  • FIG. 4 is a detailed schematic diagram 1 of a sealing cover covering a liquid injection hole provided by an embodiment of the present invention
  • FIG. 5 is a second detailed schematic diagram of a sealing cover covering a liquid injection hole provided by an embodiment of the present invention.
  • Fig. 6 is the detailed schematic diagram 3 of the sealing cover covering the liquid injection hole provided by an embodiment of the present invention.
  • Fig. 7 is a detailed schematic diagram 4 of a sealing cover covering a liquid injection hole provided by an embodiment of the present invention.
  • Fig. 8 is a detailed schematic diagram 5 of a sealing cover covering a liquid injection hole provided by an embodiment of the present invention.
  • Fig. 9 is the enlarged schematic diagram of A place in Fig. 2;
  • Fig. 10 is the enlarged schematic diagram one at B in Fig. 2;
  • Fig. 11 is the enlarged schematic diagram two at B in Fig. 2;
  • FIG. 12 is a schematic structural diagram of a battery provided by an embodiment of the present invention.
  • FIG. 13 is a top view of a battery according to an embodiment of the present invention.
  • FIG. 14 is a bottom view of a battery provided by an embodiment of the present invention.
  • button batteries are widely used in various electronic products due to their small size, such as: computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controls, electric toys, pacemakers, electronic hearing aids , counters and cameras.
  • a button-type battery includes a casing and a top cover, the casing is connected to the negative terminal of the cell, the top cover is connected to the positive terminal of the cell, the casing is usually a steel casing, and the top cover is usually an aluminum alloy top cover.
  • the liquid injection hole is opened on the top cover, and the welding performance of the aluminum alloy top cover is relatively poor, resulting in poor welding effect between the sealing cover and the aluminum alloy top cover, which may easily lead to the leakage of the button battery, which in turn leads to the good quality of the button battery.
  • the structure of the top cover is usually complicated and the space is relatively small, which leads to the inconvenience of the setting of the injection hole and the sealing cover, and the processing difficulty of the button battery is increased.
  • the utility model provides a battery
  • the battery is provided with a liquid injection hole on the bottom wall of the casing, and a sealing cover for sealing the liquid injection hole is welded at the liquid injection hole.
  • the bottom wall of the shell has less associated structure, simpler overall structure and larger space, which not only facilitates the setting of the liquid injection hole, but also facilitates the subsequent welding of the sealing cover, which is conducive to the lifting of the sealing cover.
  • the welding effect of the battery is improved, which is beneficial to improve the yield of the battery and reduce the difficulty of the processing and manufacturing process of the battery.
  • the second metal sheet is usually an aluminum alloy sheet
  • the welding performance of the aluminum alloy is relatively poor
  • the shell is usually a steel shell, and the welding performance of the steel is relatively good.
  • the bottom wall is beneficial to improve the effect of welding and sealing the liquid injection hole of the sealing cover, thereby helping to reduce the probability of liquid leakage of the battery, thereby helping to improve the yield of the battery.
  • Fig. 1 is a sectional view 1 of a battery provided by an embodiment of the present utility model
  • Fig. 2 is a sectional view 2 of a battery provided by an embodiment of the present utility model
  • Fig. 3 is a sectional view 3 of the battery provided by an embodiment of the present utility model
  • Fig. 4 Figure 5 is a detailed schematic diagram 1 of the sealing cover covering the liquid injection hole provided by an embodiment of the present invention
  • Figure 5 is a detailed schematic diagram 2 of the sealing cover covering the liquid injection hole provided by the first embodiment of the present invention
  • Figure 6 is the present invention
  • Figure 7 is a detailed schematic diagram 4 of a sealing cover covering a liquid injection hole provided by an embodiment of the present invention
  • Figure 8 is a schematic diagram of an embodiment of the present invention.
  • Fig. 1 is a sectional view 1 of a battery provided by an embodiment of the present utility model
  • Fig. 2 is a sectional view 2 of a battery provided by an embodiment of the present utility model
  • Fig. 3 is a sectional
  • the present embodiment provides a battery, the battery includes a cell assembly 40 and a casing assembly, the casing assembly includes a casing 10 and a top cover, and the casing 10 and the top cover form a accommodating cavity , the accommodating cavity is used for accommodating the cell assembly 40 .
  • the housing 10 includes a bottom wall 12 and an annular side wall 11 which are connected to each other, and the bottom wall 12 and the top cover are located at two ends of the annular side wall 11 , respectively.
  • the bottom wall 12 and the annular side wall 11 are generally one piece, and the bottom wall 12 is located at the bottom end of the annular side wall 11 , and the top cover is located at the top end of the annular side wall 11 .
  • Housing 10 may be a steel housing.
  • the top cover includes a first metal sheet 13 having a through hole, an insulating seal 30 and a second metal sheet 20, the first metal sheet 13 is connected to one end of the annular side wall 11, and the second metal sheet 20 is sealed by an insulating seal.
  • the piece 30 is connected to the first metal sheet 13 and covers the through hole.
  • the insulating sealing member insulates the second metal sheet 20 and the first metal sheet 13, and on the other hand, ensures the sealing between the second metal sheet 20 and the first metal sheet 13.
  • the second metal sheet 20 may be an aluminum alloy sheet.
  • the cell assembly 40 has a first tab 42 and a second tab 41 .
  • the electrical properties of the first tab 42 and the second tab 41 are opposite, and the first tab 42 can be connected to the second metal sheet 20 .
  • the first tab 42 is connected to the second metal sheet 20 by welding;
  • the second tab 41 can be connected to the housing 10 or the first metal sheet 13 , for example, the second tab 41 is connected to the housing 10 or the first metal Sheet 13 is soldered to connect. So that the electric energy generated on the battery cell assembly 40 is transmitted outward through the housing assembly to provide electric energy for the external electrical equipment; or, when the battery is a rechargeable battery and the external charging equipment is charged, the electrical energy provided by the charging equipment to the battery can be It is transmitted to the cell assembly 40 through the shell assembly.
  • the bottom wall 12 is provided with a liquid injection hole 121, so that a sufficient amount of electrolyte is injected into the battery through the liquid injection hole 121 during the process of manufacturing the battery, which is beneficial to ensure the cycle performance of the battery.
  • the sealing cover 14 for sealing the liquid injection hole 121 is welded at the liquid injection hole 121 . The sealing cover 14 can prevent the electrolyte from leaking from the liquid injection hole 121 .
  • the cell assembly 40 may be a wound cell.
  • the wound cell includes a positive electrode sheet, a negative electrode sheet, and a separator separating the positive electrode sheet and the negative electrode sheet; the positive electrode sheet is provided with a positive electrode ear, and the positive electrode
  • the lugs can be set on the positive electrode sheet by welding, the negative electrode sheet is provided with negative electrode lugs, and the negative electrode lugs can be set on the negative electrode sheet by welding; during the winding process, the positive electrode sheet, the negative electrode sheet and the diaphragm face the same direction from the beginning of the winding It is wound layer by layer and finally formed into a wound cell.
  • the first tab can be a positive tab and the second tab can be a negative tab, or the first tab can be a negative tab and the second tab can be a positive tab.
  • the cell components may also be laminated cells or other types of cells, as long as the requirements of this embodiment can be met.
  • the first tab 42 can be set as a positive tab
  • the second tab 41 can be set as a negative tab
  • the cell assembly 40 can be accommodated in the accommodating cavity enclosed by the casing 10 and the top cover
  • the first tab 41 can be set as a negative tab.
  • 42 is electrically connected to the second metal sheet 20 so that the second metal sheet 20 forms the positive electrode of the button battery
  • the second tab 41 is electrically connected to the case 10 so that the case 10 forms the negative electrode of the button battery.
  • the button battery is applied to an electronic product
  • the second metal sheet 20 is connected to the positive electrode of the electronic product and the casing 10 is connected to the negative electrode of the electronic product, thereby supplying power to the electronic product.
  • the battery in this embodiment includes a cell assembly 40 and a shell assembly.
  • the shell assembly includes a casing 10 and a top cover.
  • the casing 10 and the top cover form an accommodating cavity, and the accommodating cavity is used for accommodating the cell assembly 40.
  • the assembly 40 can output electrical energy to the outside through the casing assembly, or the cell assembly 40 can receive electrical energy input from the outside through the casing assembly.
  • the housing 10 includes a bottom wall 12 and an annular side wall 11 which are connected to each other, and the bottom wall 12 and the top cover are located at both ends of the annular side wall 11, respectively.
  • the bottom wall 12 is provided with a liquid injection hole 121 , and a sealing cover 14 for sealing the liquid injection hole 121 is welded at the liquid injection hole 121 .
  • the bottom wall 12 of the housing 10 has less associated structures, simpler overall structure and larger space, which not only facilitates the setting of the liquid injection hole 121, but also facilitates the subsequent welding of the sealing cover 14. It is beneficial to improve the welding effect of the sealing cover 14 , thereby improving the yield of the battery, and reducing the difficulty in the manufacturing process of the battery.
  • the second metal sheet 20 is usually an aluminum alloy sheet, the welding performance of the aluminum alloy is relatively poor, and the shell 10 is usually a steel shell, and the welding performance of the steel is relatively good.
  • the bottom wall 12 of the case 10 is beneficial to improve the effect of welding the sealing cover 14 to seal the liquid injection hole 121 , thereby helping to reduce the probability of liquid leakage of the battery, and thus helping to improve the yield of the battery.
  • the outer surface of the bottom wall 12 is provided with an accommodating groove 122, the liquid injection hole 121 is arranged at the bottom of the accommodating groove 122, and the diameter of the liquid injection hole 121 is smaller than the diameter of the accommodating groove 122;
  • the cover 14 is located in the accommodating groove 122 , and the diameter of the sealing cover 14 is smaller than or equal to the diameter of the accommodating groove 122 and larger than the diameter of the liquid injection hole 121 .
  • the accommodating groove 122 can limit the sealing cover 14 so that the edge of the sealing cover 14 evenly overlaps the edge of the liquid injection hole 121 , so as to better cover and seal the liquid injection hole 121 .
  • the sealing cover 14 is located in the accommodating groove 122, which can reduce the height of the sealing cover 14 protruding from the bottom wall 12, which is beneficial to improve the appearance flatness of the button battery.
  • the difference between the diameter of the accommodating groove 122 and the diameter of the liquid injection hole 121 is greater than or equal to 0.5 mm.
  • the difference between the diameter of the accommodating groove 122 and the diameter of the liquid injection hole 121 can be based on actual needs Set to 0.5mm, 0.7mm, 0.9mm, 1mm, 1.1mm, 1.3mm, or any value greater than 0.5mm. Therefore, it can be avoided that the difference between the diameter of the accommodating groove 122 and the diameter of the liquid injection hole 121 is too small, so as to ensure that the width of the sealing cover 14 overlapping the edge of the liquid injection hole 121 is not too narrow, and the sealing cover 14 can seal the liquid injection.
  • the reliability of the hole 121 is beneficial to reduce the risk of liquid leakage of the button battery and improve the yield of the button battery.
  • the difference between the diameter of the accommodating groove 122 and the diameter of the sealing cover 14 ranges from 0.01 mm to 2.5 mm.
  • the difference between the diameter of the accommodating groove 122 and the diameter of the sealing cover 14 can be based on actual needs Set to 0.01mm, 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or any value in the range of 0.01mm-2.5mm.
  • it is avoided that the difference between the diameter of the accommodating groove 122 and the diameter of the sealing cover 14 is too small, which makes it difficult to put the sealing cover 14 into the accommodating groove 122;
  • the difference between the diameters is too large, so that the width of the sealing cover 14 overlapping the edge of the liquid injection hole 121 is too narrow.
  • the depth of the accommodating groove 122 ranges from 0.01mm to 0.15mm.
  • the depth of the accommodating groove 122 can be set to 0.01mm, 0.05mm, 0.07mm, 0.09mm, 0.13mm, 0.15mm according to actual needs mm or any value in the range of 0.01mm-0.15mm.
  • the cell assembly 40 may be a wound cell, the center of the wound cell has a shaft hole, and the projection of the liquid injection hole 121 and the shaft hole on the bottom wall 12 at least partially overlap, so as to facilitate The injection of electrolyte from the injection hole 121 is beneficial to ensure that sufficient electrolyte is injected into the battery, so as to ensure the cycle performance of the battery.
  • the liquid injection hole 121 and the accommodating groove 122 are arranged coaxially, so that the sealing can be judged by observing the width of the gap between the edge of the sealing cover 14 and the side wall of the accommodating groove 122 Whether the placement position of the cover 14 meets the requirements.
  • the liquid injection hole 121 and the accommodating groove 122 may also be disposed on different axes, as long as the edge of the sealing cover 14 overlaps the edge of the liquid injection hole 121 when the sealing cover 14 is placed. That's it.
  • the sealing cover 14 and the accommodating groove 122 are coaxially arranged, so that the width of the gap between the edge of the sealing cover 14 and the side wall of the accommodating groove 122 is kept uniform, which not only facilitates the Welding, and it is beneficial to ensure that the weld formed after welding is more uniform and beautiful.
  • the sealing cover 14 and the accommodating groove 122 may also be disposed on different axes, as long as the sealing cover 14 can be placed in the accommodating groove 122 without affecting the sealing cover 14 and the accommodating groove Welding between the inner walls of 122 is sufficient.
  • the liquid injection hole 121 and the casing 10 are coaxially disposed, that is, the liquid injection hole 121 is disposed at the center of the bottom wall 12 of the casing 10 .
  • the liquid injection hole 121 and the volume The cavities in the middle of the wound cells correspond to each other to facilitate the injection of electrolyte, which is beneficial to ensure that the amount of electrolyte injected into the coin-type battery meets the requirements, thereby ensuring the performance of the coin-type battery.
  • the edge of the sealing cover 14 is welded and connected to the inner wall of the accommodating groove 122 to form a first welding seam 123, and the width of the first welding seam 123 is in the range of 0.1mm-1.0mm, for example, according to actual welding In some cases, the width of the first welding seam 123 may be any value in the range of 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm or 0.1 mm-1.0 mm.
  • the sealing cover 14 can not only seal the liquid injection hole 121 well, but also help to ensure the aesthetic appearance of the button battery.
  • first welding seam 123 fills at least part of the gap.
  • Specific implementations for the first welding seam 123 to fill the gap between the edge of the sealing cover 14 and the inner wall of the accommodating groove 122 include but are not limited to the following three implementations:
  • the first welding seam 123 fills the gap between the edge of the sealing cover 14 and the inner wall of the accommodating groove 122 , improving the height of the sealing cover 14 and the accommodating groove 122
  • the sealing performance between the inner walls of the battery is improved, thereby improving the reliability of sealing the liquid injection hole 121 by the sealing cover 14 , thereby helping to improve the product yield of the button battery.
  • the first welding seam 123 fills the lower half of the gap between the edge of the sealing cover 14 and the inner wall of the accommodating groove 122 , improving the connection between the sealing cover 14 and the accommodating groove 122 .
  • the tightness between the inner walls of the grooves 122 is beneficial to improve the reliability of sealing the liquid injection hole 121 by the sealing cover 14 , thereby improving the product yield of the button battery.
  • a molten pool depression 1231 is formed on the surface of the first welding seam 123, and the molten pool depression
  • the 1231 has a depth range of 0.005mm-0.05mm.
  • the depth range of the molten pool recess 1231 may be 0.005mm, 0.008mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, or any value in the range of 0.005mm-0.05mm.
  • the first welding seam 123 is formed between the edge of the sealing cover 14 and the groove bottom of the accommodating groove 122 , that is, the first welding seam 123 fills the sealing cover 14
  • a corner of the gap between the edge of the accommodating groove 122 and the inner wall of the accommodating groove 122 is beneficial to improve the sealing performance between the sealing cover 14 and the groove bottom of the accommodating groove 122, thereby helping to improve the sealing ability of the sealing cover 14 to seal the liquid injection hole 121. reliability, which is beneficial to improve the product yield of the button battery.
  • the thickness of the sealing cover 14 is less than or equal to the depth of the accommodating groove 122 , more preferably, the thickness of the sealing cover 14 is equal to the depth of the accommodating groove 122 , so as to improve the flatness of the appearance of the button battery.
  • the central area of the sealing cover 14 protrudes in a direction away from the liquid injection hole 121 , that is, the sealing cover 14 may be formed as a curved shell with the central area arched outwards, so as to The edge of the sealing cover 14 is fully contacted with the edge of the liquid injection hole 121, so that the welding effect between the sealing cover 14 and the edge of the liquid injection hole 121 is improved, and the sealing of the sealing cover 14 to the liquid injection hole 121 is more reliable. Further, it is beneficial to improve the product yield of the button battery.
  • the height of the outer surface of the sealing cover 14 protruding from the outer surface of the bottom wall 12 ranges from 0.02 mm to 2 mm.
  • the height of the outer surface of the sealing cover 14 protruding from the outer surface of the bottom wall 12 may be Set to 0.02mm, 0.5mm, 1mm, 1.5mm, 2mm or any value within the range of 0.02mm-2mm according to actual needs.
  • the height of the inner surface of the sealing cover 14 protruding from the bottom of the accommodating groove 122 is 0.01 mm-0.05 mm.
  • the inner surface of the sealing cover 14 protrudes from the bottom of the accommodating groove 122 The height can be set to any value within the range of 0.01mm, 0.03mm, 0.05mm or 0.01mm-0.05mm according to actual needs. Therefore, it is beneficial to increase the volume of the accommodating cavity, so that more electrolytes can be accommodated in the accommodating cavity, thereby facilitating the improvement of the cycle performance of the button battery.
  • the inner surface of the sealing cover 14 may also be flush with the groove bottom of the accommodating groove 122 , which will not be repeated here.
  • the sealing cover 14 may also be flat, or the shape of the sealing cover 14 may be designed according to actual needs, as long as the requirements of this embodiment can be met, which will not be repeated here.
  • the end of the hole wall of the liquid injection hole 121 close to the cell assembly 40 can be set as an arc angle 124; or, the end of the hole wall of the liquid injection hole 121 away from the cell assembly 40 can be set as a circular arc angle 124; or, both ends of the hole wall of the liquid injection hole 121 may be set as arc angles 124.
  • the radius range of the arc angle 124 is 0.01mm-2mm.
  • the radius range of the arc angle 124 can be set to 0.01mm, 0.05mm, 0.1mm, 0.5mm, 1mm, 1.5mm according to actual needs , 2mm or any value in the range of 0.01mm-2mm.
  • the burrs formed at both ends of the hole wall of the liquid injection hole 121 during the processing can be removed to prevent the burrs from falling into the accommodating cavity and causing a short circuit, thereby helping to ensure the quality and reliability of the button battery;
  • the bottom end of the annular side wall 11 is connected to the circumferential edge of the bottom wall 12 , and under normal circumstances, the annular side wall 11 and the bottom wall 12 are integrally formed as one piece.
  • the top end of the annular side wall 11 is connected with the outer peripheral edge of the first metal sheet 13 , for example, it can be connected by welding or by other connection methods.
  • the top of the inner wall of the annular side wall 11 is provided with an annular stepped groove 111, and the outer diameter of the annular stepped groove 111 is smaller than the outer diameter of the annular side wall 11; the outer peripheral edge of the first metal sheet 13 is located in the annular stepped groove 111.
  • the stepped groove 111 can support and limit the first metal sheet 13 so as to facilitate the welding operation.
  • the outer peripheral edge of the first metal sheet 13 is welded and connected with the inner wall of the annular stepped groove 111 to form a second welding seam 112 .
  • the annular stepped groove 111 and the second welding seam 112 not only help to ensure the reliability of the connection between the first metal sheet 13 and the annular side wall 11 , but also help to ensure the sealing of the connection between the first metal sheet 13 and the annular side wall 11 . sex.
  • the width of the second welding seam 112 ranges from 0.1 mm to 1.0 mm.
  • the width of the second welding seam 112 may be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm mm or any value in the range of 0.1mm-1.0mm.
  • the second welding seam 112 is prevented from being too narrow, which reduces the welding effect and sealing effect between the annular side wall 11 and the first metal sheet 13; on the other hand, the second welding seam 112 is prevented from being too wide, which affects the button battery Appearance.
  • the annular side wall 11 and the annular stepped groove 111 are arranged coaxially, and the difference between the outer diameter of the annular side wall 11 and the outer diameter of the annular stepped groove 111 is 0.1 mm-0.18 mm, Exemplarily, the difference between the outer diameter of the annular side wall 11 and the outer diameter of the annular stepped groove 111 may be set in the range of 0.1mm, 0.13mm, 0.15mm, 0.17mm, 0.18mm or 0.1mm-0.18mm according to actual needs any value of .
  • the stepped surface at the top of the annular side wall 11 is too narrow, which will affect the limiting effect of the annular stepped groove 111 on the first metal sheet 13;
  • the thickness of the part is too thin, which affects the welding effect between the outer peripheral edge of the first metal sheet 13 and the inner wall of the annular stepped groove 111 , and the strength of the connection between the outer peripheral edge of the first metal sheet 13 and the inner wall of the annular stepped groove 111 .
  • the thickness of the first metal sheet 13 is equal to the depth of the annular stepped groove 111, which not only helps to ensure the welding effect between the outer peripheral edge of the first metal sheet 13 and the inner wall of the annular stepped groove 111, but also helps to ensure the buckle.
  • the appearance of the battery is aesthetically pleasing.
  • the outer peripheral edge of the insulating sealing member 30 is formed with a first insulating protrusion 31 that shields the outer peripheral edge of the second metal sheet 20 .
  • the first insulating protrusion 31 is not only conducive to ensuring that the edge of the second metal sheet 20 is connected Insulation between the metal sheets 13 ; and it is beneficial to improve the sealing performance between the second metal sheet 20 and the first metal sheet 13 .
  • the inner peripheral edge of the insulating seal 30 is formed with a second insulating protrusion 32 that shields the inner edge of the first metal sheet 13 .
  • the second insulating protrusion 32 not only helps to ensure that the second metal sheet 20 and the first metal Insulation between the inner edges of the sheets 13 ; and it is beneficial to improve the sealing between the second metal sheet 20 and the first metal sheet 13 .
  • a first annular groove 21 may be provided on the outer surface of the second metal sheet 20, and the thickness of the groove bottom of the first annular groove 21 is smaller than that of the second metal sheet 20.
  • the first annular groove 21 can play the role of pressure relief and explosion prevention when the pressure inside the battery increases, thereby helping to avoid serious harm caused by the battery explosion.
  • a second annular groove may be provided on the outer surface of the bottom wall 12, and the thickness of the groove bottom of the second annular groove is smaller than the thickness of the bottom wall 12;
  • the inner surface of the second annular groove is provided with a second annular groove, and the thickness of the groove bottom of the second annular groove is smaller than the thickness of the bottom wall 12 .
  • the second annular groove can play the role of pressure relief and explosion prevention when the pressure inside the battery increases, thereby helping to avoid serious harm caused by battery explosion.
  • the first implementation manner is a relatively preferred solution.
  • the inner surface of the second metal sheet 20 or the inner surface of the bottom wall 12 refers to the side surface facing the accommodating cavity
  • the outer surface of the second metal sheet 20 or the outer surface of the bottom wall 12 is Refers to the side surface facing away from the accommodating cavity.
  • the first annular groove 21 includes a first outer annular groove 211 and a first inner annular groove 212 , and the first inner annular groove 212 is provided at the groove bottom of the first outer annular groove 211 , and the notch width of the first inner ring groove 212 is smaller than the notch width of the first outer ring groove 211 . Since the thickness of the groove bottom of the first inner ring groove 212 is smaller, it is more sensitive to the increase in air pressure inside the button battery, so that the effect of pressure relief and explosion protection can be better achieved.
  • the second annular groove includes a second outer annular groove and a second inner annular groove, the second inner annular groove is provided at the groove bottom of the second outer annular groove, and the second inner annular groove is The notch width is smaller than the notch width of the second outer ring groove. Since the thickness of the groove bottom of the second inner ring groove is smaller, it is more sensitive to the increase in air pressure inside the battery, so that the effect of pressure relief and explosion-proof can be better achieved.
  • the minimum thickness of the groove bottom of the first annular groove 21 ranges from 0.02 mm to 0.1 mm.
  • the thickness of the groove bottom of 21 is the minimum thickness; when the first annular groove 21 is in the shape shown in FIG. 11 , at this time, the groove bottom thickness of the first inner ring groove 212 is the minimum thickness.
  • the minimum thickness of the groove bottom of the first annular groove 21 may be set to any value within the range of 0.02mm, 0.04mm, 0.06mm, 0.08mm, 0.1mm or 0.02mm-0.1mm according to actual needs.
  • the minimum thickness of the groove bottom of the first annular groove 21 is too small, so that the pressure that the shell of the button battery can withstand is too much; on the other hand, the minimum thickness of the groove bottom of the first annular groove 21 is avoided.
  • the thickness is too large, resulting in poor pressure relief and explosion-proof effect.
  • the first annular groove 21 is arranged coaxially with the casing 10 to facilitate uniform pressure relief when the internal pressure of the button battery is too large, thereby achieving better pressure relief and explosion-proof effect.
  • the second annular groove is arranged coaxially with the casing 10, so as to perform uniform pressure relief when the internal pressure of the button battery is too large, so as to achieve better pressure relief and explosion-proof effect.
  • the second tab 41 and the bottom wall 12 of the housing 10 are welded and connected to form at least one solder print 412 , for example, the second tab 41 and the bottom wall 12 of the housing 10 may pass Resistance welding can also be done by laser welding.
  • a second tab protective glue 411 may be provided on the side of the second tab 41 facing the cell assembly 40, The second tab protective glue 411 covers the solder print 412.
  • the second tab protective glue 411 can prevent the solder print 412 from adversely affecting the cell assembly 40; on the other hand, the second tab protective glue 411 A certain heat insulation effect can be achieved when the second tab 41 is welded, and the battery core assembly 40 can be prevented from being damaged by the high temperature of welding.
  • a first tab protective glue can be provided on both sides of the first tab 42 421
  • a second tab protective glue 411 is provided on both sides of the second tab 41 .
  • a first insulating adhesive layer 43 is disposed between the first end surface of the cell assembly 40 and the bottom wall 12 , and the first insulating adhesive layer 43 is used to prevent a short circuit between the cell assembly 40 and the housing 10 .
  • Part of the first insulating adhesive layer 43 is located between the second tab protective adhesive 411 and the first end surface of the cell assembly 40 , and part of the first insulating adhesive layer 43 covers the corresponding solder print 412 of the second tab protective adhesive 411 . s position. At this time, two adhesive layers are sandwiched between the solder print 412 of the second tab 41 and the cell assembly 40 , and one is the second pole disposed on the side of the second tab 41 facing the cell assembly 40 .
  • the ear protection glue 411 is the first insulating glue layer 43 disposed between the battery core assembly 40 and the second tab 41, the two glue layers can better connect the solder print 412 on the second tab 41 to the The isolation of the cell assemblies 40 , on the one hand, prevents the solder prints 412 from piercing the adhesive layer and adversely affects the cell assemblies 40 ; on the other hand, prevents the cell assemblies 40 from being damaged by the high temperature of welding.
  • a second insulating adhesive layer 44 may be disposed between the second end face of the cell assembly 40 and the top cover, and the second insulating adhesive layer 44 is used to prevent a short circuit between the cell assembly 40 and the top cover 10 , thereby It is beneficial to ensure the reliability and safety of the battery.
  • the manufacturing process of the battery in this embodiment includes: cutting the second tab 41 of the cell assembly 40 to a fixed length and then bending, and the bent second tab 41 is parallel to the end face of the cell assembly 40;
  • the core assembly 40 is placed in the accommodating cavity of the casing 10;
  • the second tab 41 of the battery assembly 40 is welded and connected to the casing 10 by laser welding or resistance welding;
  • the second metal sheet 20 of the top cover is welded.
  • the top cover It is welded and connected with the first tab 42 of the battery cell assembly 40; after the top cover is folded, the first metal sheet 13 of the top cover extends into the annular stepped groove 111 at the top of the casing 10; by laser welding, the top cover is The first metal sheet 13 is welded and connected to the casing 10; after the above steps are completed, the semi-finished battery is placed in the oven for baking; after baking, the electrolyte is injected through the through hole at the bottom of the casing 10; after the electrolyte is injected, the sealing cover 14 It is placed in the accommodating groove 122 at the bottom of the casing 10, and the sealing cover 14 is welded and connected to the casing 10 by laser welding; after the above steps are completed, an electrical performance test is performed. Thus, the processing and manufacturing of the battery is completed.
  • the terms “installed”, “connected” and “connected” should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection.
  • Detachable connection, or integral connection may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components.
  • the specific meanings of the above terms in the present invention can be understood through specific situations.

Abstract

提供一种电池。电池包括电芯组件(40)和外壳组件,外壳组件包括壳体(10)和顶盖,壳体(10)和顶盖围合成容置腔,容置腔用于容置电芯组件(40);壳体(10)包括相互连接的底壁(12)和环形侧壁(11),底壁(12)和顶盖分别位于环形侧壁(11)的两端;底壁(12)上设置有注液孔(121),注液孔(121)处焊接有密封注液孔(121)的封口盖(14)。从而改善了注液孔(121)和封口盖(14)的设置效果,有利于提升电池的良品率。

Description

电池
本申请要求于2021年03月02日提交中国专利局、申请号为202120455729.3、申请名称为“电池”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本实用新型涉及电池技术领域,尤其涉及一种电池。
背景技术
电池分为化学电池和物理电池两类,其中,化学电池应用最为普遍,主要由阳极、阴极及其电解液组成。
常用的电池例如扣式电池主要包括外壳和封装于外壳内的电芯,外壳通常包括相互绝缘的壳体和顶盖,顶盖通常与电芯的第一极耳连接,壳体通常与电芯的第二极耳连接。为了方便向外壳内注入足量的电解液,通常在顶盖上开设注液孔,待电解液注入完毕后,用封口盖焊接密封注液孔。
然而,在顶盖上设置注液孔并焊接封口盖的效果不佳,可能导致扣式电池的良品率降低。
实用新型内容
本实用新型提供一种电池,该电池改善了注液孔和封口盖的设置效果,有利于提升扣式电池的良品率。
本实用新型提供一种电池,包括电芯组件和外壳组件,所述外壳组件包括壳体和顶盖,所述壳体和所述顶盖围合成容置腔,所述容置腔用于容置所述电芯组件;所述壳体包括相互连接的底壁和环形侧壁,所述底壁和所述顶盖分别位于所述环形侧壁的两端;所述底壁上设置有注液孔,所述注液孔处焊接有密封所述注液孔的封口盖。
本实用新型的电池包括电芯组件和外壳组件,外壳组件包括壳体和顶盖,壳体和顶盖围合成容置腔,容置腔用于容置电芯组件,电芯组件能够通过外 壳组件向外输出电能,或者,电芯组件能够通过外壳组件接收外界输入的电能。壳体包括相互连接的底壁和环形侧壁,底壁和顶盖分别位于环形侧壁的两端。
通过在底壁上设置有注液孔,并在注液孔处焊接密封注液孔的封口盖。一方面,由于壳体的底壁相比于顶盖关联结构比较少、整体结构比较简单且空间比较大,从而不仅便于注液孔的设置,而且便于后续封口盖的焊接,有利于提升封口盖的焊接效果,进而有利于提升电池的良品率,降低电池的加工制造过程的难度。另一方面,由于第二金属片通常为铝合金片,铝合金的焊接性能比较差,而壳体通常为钢壳体,钢的焊接性能比较好,因此,将注液孔设置在壳体的底壁上有利于改善封口盖焊接密封注液孔的效果,从而有利于降低电池的漏液几率,进而有利于提升电池的良品率。
如上所述的电池,可选的,所述顶盖包括具有通孔的第一金属片、绝缘密封件和第二金属片,所述第一金属片与所述环形侧壁的一端连接,所述第二金属片通过所述绝缘密封件连接于所述第一金属片,且封盖所述通孔;所述电芯组件具有第一极耳和第二极耳,所述第一极耳和所述第二极耳的电性相反,所述第一极耳与所述第二金属片连接,所述第二极耳与所述壳体或所述第一金属片连接;
如上所述的电池,可选的,所述底壁的外表面设置有容置槽,所述注液孔设置在所述容置槽的槽底,且所述注液孔的直径小于所述容置槽的直径;所述封口盖位于所述容置槽内,且所述封口盖的直径小于所述容置槽的直径并大于所述注液孔的直径。
如上所述的电池,可选的,所述容置槽的直径与所述注液孔的直径的差值大于或等于0.05mm。
如上所述的电池,可选的,所述容置槽的直径与所述封口盖的直径的差值范围为0.01mm-2.5mm。
如上所述的电池,可选的,所述容置槽的深度范围为0.01mm-0.15mm。
如上所述的电池,可选的,所述电芯组件为卷绕式电芯,所述卷绕式电芯的中部具有轴孔,所述注液孔与所述轴孔在所述底壁上的投影至少部分重叠。
如上所述的电池,可选的,所述封口盖的边缘与所述容置槽的内壁焊接连接并形成第一焊缝。
如上所述的电池,可选的,所述封口盖的边缘与所述容置槽的内壁之间具有缝隙,所述第一焊缝填充了至少部分所述缝隙。
如上所述的电池,可选的,所述第一焊缝的表面形成有熔池凹陷,所述熔池凹陷的深度范围为0.005mm-0.05mm。
如上所述的电池,可选的,所述封口盖的厚度小于或等于所述容置槽的深度。
如上所述的电池,可选的,所述封口盖的中心区域朝向远离所述注液孔的方向凸出;所述封口盖的外表面凸出于所述底壁的外表面的高度范围为0.02mm-2mm;和/或,所述封口盖的内表面凸出于所述容置槽的槽底的高度范围为0.01mm-0.05mm。
如上所述的电池,可选的,所述注液孔的孔壁靠近所述电芯组件的一端设置为圆弧角;和/或,所述注液孔的孔壁远离所述电芯组件的一端设置为圆弧角。
如上所述的电池,可选的,所述壳体为钢壳体,所述第二金属片为铝合金片。
如上所述的电池,可选的,所述环形侧壁的内壁顶端设置有环形台阶槽,所述环形台阶槽的外径小于所述环形侧壁的外径;所述第一金属片的外周边缘位于所述环形台阶槽内,且所述第一金属片的外周边缘与所述环形台阶槽的内壁焊接连接形成第二焊缝。
如上所述的电池,可选的,所述环形侧壁与所述环形台阶槽同轴设置,且所述环形侧壁的外径与所述环形台阶槽的外径的差值范围为0.1mm-0.18mm。
如上所述的电池,可选的,所述绝缘密封件的外周边缘形成有遮挡所述第二金属片的外周边缘的第一绝缘凸起。
如上所述的电池,可选的,所述绝缘密封件的内周边缘形成有遮挡所述第一金属片的内边缘的第二绝缘凸起。
如上所述的电池,可选的,所述第二金属片的外表面或内表面设置有第一环形凹槽,所述第一环形凹槽的槽底的厚度小于所述第一金属片的厚度。
如上所述的电池,可选的,所述底壁的外表面或内表面设置有第二环形凹槽,所述第二环形凹槽的槽底的厚度小于所述底壁的厚度。
如上所述的电池,可选的,所述第一环形凹槽包括第一外环凹槽和第一 内环凹槽,所述第一内环凹槽设置在所述第一外环凹槽的槽底,且所述第一内环凹槽的槽口宽度小于所述第一外环凹槽的槽口宽度。
如上所述的电池,可选的,所述第二环形凹槽包括第二外环凹槽和第二内环凹槽,所述第二内环凹槽设置在所述第二外环凹槽的槽底,且所述第二内环凹槽的槽口宽度小于所述第二外环凹槽的槽口宽度。
如上所述的电池,可选的,所述第一环形凹槽的槽底的最小厚度范围为0.02mm-0.1mm。
如上所述的电池,可选的,所述第一环形凹槽与所述壳体同轴设置。
如上所述的电池,可选的,所述第二环形凹槽与壳体同轴设置。
如上所述的电池,可选的,所述第二极耳与所述底壁焊接连接并形成至少一个焊印;所述第二极耳朝向所述电芯组件的一侧设置有第二极耳保护胶,所述第二极耳保护胶覆盖住所述焊印;所述底壁外表面与所述焊印对应的区域无焊印。
如上所述的电池,可选的,所述电芯组件的端面与所述底壁之间设置有第一绝缘胶层,部分所述第一绝缘胶层位于所述第二极耳保护胶与所述电芯组件的第一端面之间,且部分所述第一绝缘胶层覆盖住所述第二极耳保护胶的对应于所述焊印的位置。
附图说明
为了更清楚地说明本实用新型实施例或现有技术中的技术方案,下面将对实施例或现有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实用新型的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。
图1为本实用新型一实施例提供的电池的剖视图一;
图2为本实用新型一实施例提供的电池的剖视图二;
图3为本实用新型一实施例提供的电池的剖视图三;
图4为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图一;
图5为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图二;
图6为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图三;
图7为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图四;
图8为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图五;
图9为图2中A处的放大示意图;
图10为图2中B处的放大示意图一;
图11为图2中B处的放大示意图二;
图12为本实用新型一实施例提供的电池的结构示意图;
图13为本实用新型一实施例提供的电池的俯视图;
图14为本实用新型一实施例提供的电池的仰视图。
附图标记说明:
10-壳体;11-环形侧壁;111-环形台阶槽;112-第二焊缝;12-底壁;121-注液孔;122-容置槽;123-第一焊缝;1231-熔池凹陷;124-圆弧角;13-第一金属片;14-封口盖;20-第二金属片;21-第一环形凹槽;211-第一外环凹槽;212-第一内环凹槽;30-绝缘密封件;31-第一绝缘凸起;32-第二绝缘凸起;40-电芯组件;41-第二极耳;411-第二极耳保护胶;412-焊印;42-第一极耳;421-第一极耳保护胶;43-第一绝缘胶层;44-第二绝缘胶层。
具体实施方式
随着科学技术的发展,电子产品越来越多的进入到人们生活的方方面面,而电子产品的正常使用离不开电池。其中,扣式电池因其体积小,故在各种电子产品中得到了广泛的应用,例如:电脑主板、电子表、电子词典、电子秤、遥控器、电动玩具、心脏起搏器、电子助听器、计数器以及照相机等。
相关技术中,扣式电池包括壳体和顶盖,壳体与电芯的负极耳连接,顶盖与电芯的正极耳连接,壳体通常为钢壳体,顶盖通常为铝合金顶盖,注液孔开设在顶盖上,铝合金顶盖的焊接性能比较差,从而导致封口盖与铝合金顶盖的焊接效果不佳,容易导致扣式电池漏液,进而导致扣式电池的良品率降低;而且,顶盖结构通常比较复杂,空间比较小,从而导致注液孔和封口盖设置不便,导致扣式电池的加工难度提升。
为了解决上述技术问题,本实用新型提供一种电池,该电池通过在外壳的底壁上设置有注液孔,并在注液孔处焊接密封注液孔的封口盖。一方面,由于壳体的底壁相比于顶盖关联结构比较少、整体结构比较简单且空间比较大,从而不仅便于注液孔的设置,而且便于后续封口盖的焊接,有利于提升 封口盖的焊接效果,进而有利于提升电池的良品率,降低电池的加工制造过程的难度。另一方面,由于第二金属片通常为铝合金片,铝合金的焊接性能比较差,而壳体通常为钢壳体,钢的焊接性能比较好,因此,将注液孔设置在壳体的底壁上有利于改善封口盖焊接密封注液孔的效果,从而有利于降低电池的漏液几率,进而有利于提升电池的良品率。
为使本实用新型实施例的目的、技术方案和优点更加清楚,下面将结合本实用新型实施例中的附图,对本实用新型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实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,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,都属于本实用新型保护的范围。
图1为本实用新型一实施例提供的电池的剖视图一;图2为本实用新型一实施例提供的电池的剖视图二;图3为本实用新型一实施例提供的电池的剖视图三;图4为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图一;图5为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图二;图6为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图三;图7为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图四;图8为本实用新型一实施例提供的封口盖盖合注液孔的细节示意图五;图9为图2中A处的放大示意图;图10为图2中B处的放大示意图一;图11为图2中B处的放大示意图二;图12为本实用新型一实施例提供的电池的结构示意图;图13为本实用新型一实施例提供的电池的俯视图;图14为本实用新型一实施例提供的电池的仰视图。
参照图1和图14所示,本实施例提供一种电池,该电池包括包括电芯组件40和外壳组件,外壳组件包括壳体10和顶盖,壳体10和顶盖围合成容置腔,容置腔用于容置电芯组件40。
壳体10包括相互连接的底壁12和环形侧壁11,底壁12和顶盖分别位于环形侧壁11的两端。示例性的,底壁12和环形侧壁11通常为一体件,且底壁12位于环形侧壁11的底端,顶盖位于环形侧壁11的顶端。壳体10可以为钢壳体。
可选的,顶盖包括具有通孔的第一金属片13、绝缘密封件30和第二金属片20,第一金属片13与环形侧壁11的一端连接,第二金属片20通过绝缘密封件30连接于第一金属片13,且封盖通孔。绝缘密封件一方面使第二金属片 20与第一金属片13之间绝缘,另一方面,保证第二金属片20与第一金属片13之间的密封性。第二金属片20可以为铝合金片。
电芯组件40具有第一极耳42和第二极耳41,第一极耳42和第二极耳41的电性相反,第一极耳42可以与第二金属片20连接,示例性的,第一极耳42与第二金属片20焊接连接;第二极耳41可以与壳体10或第一金属片13连接,示例性的,第二极耳41与壳体10或第一金属片13焊接连接。以使电芯组件40上产生的电能通过壳体组件向外传输以为外接用电设备提供电能;或者,当电池为可充电的电池,并且外接充电设备充电时,充电设备提供给电池的电能可以通过外壳组件传输至电芯组件40。
底壁12上设置有注液孔121,以便在制造电池的过程中通过注液孔121向电池内部注入足量的电解液,足量的电解液有利于保证电池的循环性能。注液完成后在注液孔121处焊接密封注液孔121的封口盖14,封口盖14能够防止电解液从注液孔121处泄漏。
示例性的,电芯组件40可以为卷绕式电芯,具体的,卷绕式电芯包括正极片、负极片以及将正极片和负极片隔开的隔膜;正极片上设置有正极耳,正极耳可以通过焊接的方式设置在正极片上,负极片上设置有负极耳,负极耳可以通过焊接的方式设置在负极片上;卷绕过程中正极片、负极片以及隔膜从卷绕首端开始朝同一方向逐层卷绕并最终形成卷绕式电芯。本实施例中,第一极耳可以为正极耳,第二极耳为负极耳,或者,第一极耳可以为负极耳,第二极耳为正极耳。当然,电芯组件也可以为叠片式电芯或者其他类型的电芯,只要能够满足本实施例的要求即可。
具体实现时,可以设置第一极耳42为正极耳,第二极耳41为负极耳,将电芯组件40容置于壳体10和顶盖围合成的容置腔内,第一极耳42与第二金属片20电连接以使第二金属片20形成为扣式电池的正极,第二极耳41与壳体10电连接以使壳体10形成为扣式电池的负极。当该扣式电池应用在电子产品上时,第二金属片20与电子产品的正极连接导通,壳体10与电子产品的负极连接导通,从而为电子产品供电。
本实施例的电池包括电芯组件40和外壳组件,外壳组件包括壳体10和顶盖,壳体10和顶盖围合成容置腔,容置腔用于容置电芯组件40,电芯组件40能够通过外壳组件向外输出电能,或者,使电芯组件40能够通过外壳组件接收外界输入的电能。壳体10包括相互连接的底壁12和环形侧壁11,底壁 12和顶盖分别位于环形侧壁11的两端。
通过在底壁12上设置有注液孔121,并在注液孔121处焊接密封注液孔121的封口盖14。一方面,由于壳体10的底壁12相比于顶盖关联结构比较少、整体结构比较简单且空间比较大,从而不仅便于注液孔121的设置,而且便于后续封口盖14的焊接,有利于提升封口盖14的焊接效果,进而有利于提升电池的良品率,降低电池的加工制造过程的难度。另一方面,由于第二金属片20通常为铝合金片,铝合金的焊接性能比较差,而壳体10通常为钢壳体,钢的焊接性能比较好,因此,将注液孔121设置在壳体10的底壁12上有利于改善封口盖14焊接密封注液孔121的效果,从而有利于降低电池的漏液几率,进而有利于提升电池的良品率。
参照图1至图3,底壁12的外表面设置有容置槽122,注液孔121设置在容置槽122的槽底,且注液孔121的直径小于容置槽122的直径;封口盖14位于容置槽122内,且封口盖14的直径小于或等于容置槽122的直径并大于注液孔121的直径。一方面,容置槽122能够对封口盖14进行限位,以使封口盖14的边缘均匀的搭接在注液孔121的边缘上,从而更好的盖合并密封注液孔121。另一方面,封口盖14位于容置槽122内,能够降低封口盖14凸出底壁12的高度,有利于改善扣式电池的外观的平整度。
可选的,容置槽122的直径与注液孔121的直径的差值大于或等于0.5mm,示例性的,容置槽122的直径与注液孔121的直径的差值可以根据实际需要设置为0.5mm、0.7mm、0.9mm、1mm、1.1mm、1.3mm或者大于0.5mm的任意值。从而能够避免容置槽122的直径与注液孔121的直径的差值太小,以保证封口盖14搭接在注液孔121的边缘的宽度不会太窄,提高封口盖14密封注液孔121的可靠性,进而有利于降低扣式电池漏液的风险,提高扣式电池的良品率。
可选的,容置槽122的直径与封口盖14的直径的差值范围为0.01mm-2.5mm,示例性的,容置槽122的直径与封口盖14的直径的差值可以根据实际需要设置为0.01mm、0.1mm、0.5mm、1mm、1.5mm、2mm、2.5mm或者0.01mm-2.5mm范围内的任意值。一方面,避免容置槽122的直径与封口盖14的直径的差值太小,导致封口盖14难以放入容置槽122内;另一方面,避免容置槽122的直径与封口盖14的直径的差值太大,导致封口盖14搭接在注液孔121的边缘的宽度太窄。
可选的,容置槽122的深度范围为0.01mm-0.15mm,示例性的,容置槽122的深度可以根据实际需要设置为0.01mm、0.05mm、0.07mm、0.09mm、0.13mm、0.15mm或者0.01mm-0.15mm范围内的任意值。一方面,避免容置槽122的深度太大,导致容置槽122的槽底太薄,对扣式电池的强度不利;另一方面,避免容置槽122的深度太浅,导致容置槽122无法起到限位封口盖14、降低封口盖14的凸出高度的目的,或者,导致容置槽122限位封口盖14、降低封口盖14的凸出高度的效果不好。
参照图1和图2,电芯组件40可以为卷绕式电芯,卷绕式电芯的中部具有轴孔,注液孔121与轴孔在底壁12上的投影至少部分重叠,以便于电解液从注液孔121的注入,从而有利于保证电池内部注入充足的电解液,以保证电池的循环性能。
在一种可选的实现方式中,注液孔121和容置槽122同轴设置,以便于通过观察封口盖14的边缘与容置槽122的侧壁之间的缝隙的宽度,来判断封口盖14的放置位置是否符合要求。
在其他可选的实现方式中,注液孔121和容置槽122也可以不同轴设置,只要能够满足放置封口盖14时,使封口盖14的边缘搭接在注液孔121的边缘上即可。
在一种可选的实现方式中,封口盖14和容置槽122同轴设置,以使封口盖14的边缘与容置槽122的侧壁之间的缝隙的宽度保持均匀,从而不仅便于进行焊接,而且有利于保证焊接后形成的焊缝比较均匀美观。
在其他可选的实现方式中,封口盖14和容置槽122也可以不同轴设置,只要能够满足将封口盖14放入容置槽122内,并且不会影响封口盖14与容置槽122的内壁之间的焊接即可。
在一种可选的实现方式中,注液孔121和壳体10同轴设置,即,注液孔121设置在壳体10的底壁12的中心位置,此时,注液孔121与卷绕式电芯中间的空腔相对应,以便于电解液的注入,从而有利于保证注入扣式电池内部的电解液的量满足要求,进而有利于保证扣式电池的性能。
参照图4至图6,封口盖14的边缘与容置槽122的内壁焊接连接形成第一焊缝123,第一焊缝123的宽度范围为0.1mm-1.0mm,示例性的,根据实际焊接情况,第一焊缝123的宽度可以为0.1mm、0.3mm、0.5mm、0.7mm、1.0mm或者0.1mm-1.0mm范围内的任意值。一方面,避免焊缝太窄降低封口 盖14密封注液孔121的效果;另一方面,避免焊缝太宽影响扣式电池的外观的美观度。从而使封口盖14不仅能够比较好的密封注液孔121,而且有利于保证扣式电池的外观的美观度。
进一步的,封口盖14的边缘与容置槽122的内壁之间具有缝隙,第一焊缝123填充了至少部分缝隙。第一焊缝123填充封口盖14的边缘与容置槽122的内壁之间的缝隙的具体实现方式包括但不限于以下三种实现方式:
参照图4,在第一种可选的实现方式中,第一焊缝123填平了封口盖14的边缘与容置槽122的内壁之间的缝隙,提高了封口盖14与容置槽122的内壁之间的密封性,从而提高了封口盖14密封注液孔121的可靠性,进而有利于提高扣式电池的产品良率。
参照图5,在第二种可选的实现方式中,第一焊缝123填充了封口盖14的边缘与容置槽122的内壁之间的缝隙的下半部分,提高封口盖14与容置槽122的内壁之间的密封性,从而有利于提高封口盖14密封注液孔121的可靠性,进而有利于提高扣式电池的产品良率。
进一步的,当第一焊缝123填充了封口盖14的边缘与容置槽122的内壁之间的缝隙的下半部分时,第一焊缝123的表面形成有熔池凹陷1231,熔池凹陷1231的深度范围为0.005mm-0.05mm。示例性的,根据实际焊接情况,熔池凹陷1231的深度范围可以为0.005mm、0.008mm、0.01mm、0.02mm、0.03mm、0.04mm、0.05mm或者0.005mm-0.05mm范围内的任意值。
参照图6,在第三种可选的实现方式中,第一焊缝123形成在封口盖14的边缘与容置槽122的槽底之间,即,第一焊缝123填充了封口盖14的边缘与容置槽122的内壁之间的缝隙的一个角落,有利于提高封口盖14与容置槽122的槽底之间的密封性,从而有利于提高封口盖14密封注液孔121的可靠性,进而有利于提高扣式电池的产品良率。
可选的,封口盖14的厚度小于或等于容置槽122的深度,较为优选的,封口盖14的厚度等于容置槽122的深度,从而有利于提高扣式电池的外观的平整度。
参照图7,在一种可选的实现方式中,封口盖14的中心区域朝向远离注液孔121的方向凸出,即,封口盖14可以形成为中心区域向外拱起的曲面壳,以使封口盖14的边缘与注液孔121的边缘充分接触,从而有利于提高封口盖14与注液孔121的边缘之间的焊接效果,使封口盖14对注液孔121的密封更 可靠,进而有利于提高扣式电池的产品良率。
可选的,封口盖14的外表面凸出于底壁12的外表面的高度范围为0.02mm-2mm,示例性的,封口盖14的外表面凸出于底壁12的外表面的高度可以根据实际需要设置为0.02mm、0.5mm、1mm、1.5mm、2mm或者0.02mm-2mm范围内的任意值。一方面,避免封口盖14的外表面凸出于底壁12的外表面的高度太低,使封口盖14的边缘与注液孔121的边缘的接触效果不够好;另一方面,避免封口盖14的外表面凸出于底壁12的外表面的高度太高,影响扣式电池的外观的美观度。
可选的,封口盖14的内表面凸出于容置槽122的槽底的高度范围为0.01mm-0.05mm,示例性的,封口盖14的内表面凸出于容置槽122的槽底的高度可以根据实际需要设置为0.01mm、0.03mm、0.05mm或者0.01mm-0.05mm范围内的任意值。从而有利于增大容置腔的容积,以使容置腔内能够容纳更多的电解液,进而有利于提升扣式电池的循环性能。当然,封口盖14的内表面也可以和容置槽122的槽底平齐,此处不再赘述。
在其他可选的实现方式中,封口盖14也可以为平板状,或者,封口盖14的形状还可以根据实际需要进行设计,只要能够满足本实施例的要求即可,此处不再赘述。
参照图8,可以将注液孔121的孔壁靠近电芯组件40的一端设置为圆弧角124;或,可以将注液孔121的孔壁远离电芯组件40的一端设置为圆弧角124;或,可以将注液孔121的孔壁两端均设置为圆弧角124。
可选的,圆弧角124的半径范围为0.01mm-2mm,示例性的,圆弧角124的半径范围可以根据实际需要设置为0.01mm、0.05mm、0.1mm、0.5mm、1mm、1.5mm、2mm或者0.01mm-2mm范围内的任意值。一方面,能够去除注液孔121的孔壁两端在加工过程中形成的毛刺,以防止毛刺掉落在容置腔内导致短路,进而有利于保证扣式电池的质量和可靠性;另一方面,避免注液孔121的孔壁两端形成的棱角比较锋利划伤其他零件。
参照图1至图3,环形侧壁11的底端与底壁12的周向边缘连接,通常情况下,环形侧壁11与底壁12为一体成型的一体件。环形侧壁11的顶端与第一金属片13的外周边缘连接,示例性的,可以是焊接连接,也可以通过其他连接方式连接。
参照图9,环形侧壁11的内壁顶端设置有环形台阶槽111,环形台阶槽 111的外径小于环形侧壁11的外径;第一金属片13的外周边缘位于环形台阶槽111内,环形台阶槽111能够对第一金属片13进行支撑和限位,以便于进行焊接操作。第一金属片13的外周边缘与环形台阶槽111的内壁焊接连接形成第二焊缝112。环形台阶槽111和第二焊缝112不仅有利于保证第一金属片13与环形侧壁11之间连接的可靠性,而且有利于保证第一金属片13与环形侧壁11之间连接的密封性。
可选的,第二焊缝112的宽度范围为0.1mm-1.0mm,示例性的,根据实际焊接情况,第二焊缝112的宽度可以为0.1mm、0.3mm、0.5mm、0.7mm、1.0mm或者0.1mm-1.0mm范围内的任意值。一方面,避免第二焊缝112太窄,降低了环形侧壁11与第一金属片13之间的焊接效果和密封效果;另一方面,避免第二焊缝112太宽,影响扣式电池的外观。
在一种可选的实现方式中,环形侧壁11与环形台阶槽111同轴设置,且环形侧壁11的外径与环形台阶槽111的外径的差值范围为0.1mm-0.18mm,示例性的,环形侧壁11的外径与环形台阶槽111的外径的差值可以根据实际需要设置为0.1mm、0.13mm、0.15mm、0.17mm、0.18mm或者0.1mm-0.18mm范围内的任意值。一方面,避免环形侧壁11顶端的台阶面太窄,影响环形台阶槽111对第一金属片13的限位效果;另一方面,避免环形台阶槽111的环绕在第一金属片13外周的部分的厚度太薄,影响第一金属片13的外周边缘与环形台阶槽111的内壁之间的焊接效果,以及第一金属片13的外周边缘与环形台阶槽111的内壁之间连接的强度。
可选的,第一金属片13的厚度与环形台阶槽111的深度相等,不仅有利于保证第一金属片13的外周边缘与环形台阶槽111的内壁之间的焊接效果,而且有利于保证扣式电池的外观的美观度。
参照图9,绝缘密封件30的外周边缘形成有遮挡第二金属片20的外周边缘的第一绝缘凸起31,第一绝缘凸起31不仅有利于保证第二金属片20的边缘与第一金属片13之间的绝缘性;而且有利于提升第二金属片20与第一金属片13之间的密封性。
参照图9,绝缘密封件30的内周边缘形成有遮挡第一金属片13的内边缘的第二绝缘凸起32,第二绝缘凸起32不仅有利于保证第二金属片20与第一金属片13的内边缘之间的绝缘性;而且有利于提升第二金属片20与第一金属片13之间的密封性。
参照图12和图13,在第一种可选的实现方式中,可以在第二金属片20的外表面设置第一环形凹槽21,第一环形凹槽21的槽底的厚度小于第二金属片20的厚度;或者,可以在第二金属片20的内表面设置第一环形凹槽21,第一环形凹槽21的槽底的厚度小于第二金属片20的厚度。第一环形凹槽21能够在电池内部的压力升高时,起到泄压防爆的作用,从而有利于避免电池爆炸造成严重危害。
在第二种可选的实现方式中,可以在底壁12的外表面设置第二环形凹槽,第二环形凹槽的槽底的厚度小于底壁12的厚度;或者,可以在底壁12的内表面设置第二环形凹槽,第二环形凹槽的槽底的厚度小于底壁12的厚度。第二环形凹槽能够在电池内部的压力升高时,起到泄压防爆的作用,从而有利于避免电池爆炸造成严重危害。
可以理解的是,当第二金属片20为铝合金片,壳体10为钢壳体10时,在铝合金片上设置第一环形凹槽21的泄压防爆效果更好,因此,上述两种实现方式中,第一种实现方式为比较优选的方案。
需要说明的是,上述第二金属片20的内表面或底壁12的内表面均是指朝向容置腔的一侧表面,第二金属片20的外表面或底壁12的外表面均是指背离容置腔的一侧表面。
参照图11,可选的,第一环形凹槽21包括第一外环凹槽211和第一内环凹槽212,第一内环凹槽212设置在第一外环凹槽211的槽底,且第一内环凹槽212的槽口宽度小于第一外环凹槽211的槽口宽度。由于第一内环凹槽212的槽底厚度更小,因此,其对扣式电池内部的气压升高更敏感,从而能够更好的实现泄压防爆的效果。
可选的,第二环形凹槽包括第二外环凹槽和第二内环凹槽,第二内环凹槽设置在第二外环凹槽的槽底,且第二内环凹槽的槽口宽度小于第二外环凹槽的槽口宽度。由于第二内环凹槽的槽底厚度更小,因此,其对电池内部的气压升高更敏感,从而能够更好的实现泄压防爆的效果。
可选的,第一环形凹槽21的槽底的最小厚度范围为0.02mm-0.1mm,示例性的,当第一环形凹槽21为图10中所示的形状时,第一环形凹槽21的槽底的厚度即为最小厚度;当第一环形凹槽21为图11中所示的形状时,此时,第一内环凹槽212的槽底厚度为最小厚度。示例性的,第一环形凹槽21的槽底的最小厚度可以根据实际需要设置为0.02mm、0.04mm、0.06mm、0.08mm、 0.1mm或者0.02mm-0.1mm范围内的任意值。一方面,避免第一环形凹槽21的槽底的最小厚度太小,导致扣式电池的外壳所能承受的压强下降太多;另一方面,避免第一环形凹槽21的槽底的最小厚度太大,导致泄压防爆效果不好。
可选的,第一环形凹槽21与壳体10同轴设置,以便于在扣式电池的内部压力过大时进行均匀泄压,从而实现更好的泄压防爆效果。
可选的,第二环形凹槽与壳体10同轴设置,以便于在扣式电池的内部压力过大时进行均匀泄压,从而实现更好的泄压防爆效果。
参照图1,可选的,第二极耳41与壳体10的底壁12焊接连接并形成至少一个焊印412,示例性的,第二极耳41与壳体10的底壁12可以通过电阻焊接也可以通过激光焊接。为了防止第二极耳41朝向电芯组件40的一侧的焊印412剐蹭到电芯组件40,可以在第二极耳41朝向电芯组件40的一侧设置第二极耳保护胶411,并使第二极耳保护胶411覆盖住焊印412,一方面,第二极耳保护胶411能够避免焊印412对电芯组件40产生不利影响;另一方面,第二极耳保护胶411能够在焊接第二极耳41时起到一定的隔热效果,防止焊接高温伤及电芯组件40。
第二极耳41与底壁12焊接后,在底壁12的外表面与焊印412对应的区域不会形成其他焊印,从而有利于保证电池外表面的平整光滑。
为了对第一极耳42和第二极耳41进行保护,同时为了避免极耳与极片和外壳之间发生短路,可以在第一极耳42的两侧表面均设置第一极耳保护胶421,在第二极耳41的两侧表面均设置第二极耳保护胶411。
可选的,电芯组件40的第一端面与底壁12之间设置有第一绝缘胶层43,第一绝缘胶层43用于防止电芯组件40与壳体10之间发生短路。部分第一绝缘胶层43位于第二极耳保护胶411与电芯组件40的第一端面之间,且部分第一绝缘胶层43覆盖住第二极耳保护胶411的对应于焊印412的位置。此时,在第二极耳41的焊印412和电芯组件40之间夹设有两个胶层,一个为设置在第二极耳41的朝向电芯组件40的一侧的第二极耳保护胶411,另一个为设置在电芯组件40和第二极耳41之间的第一绝缘胶层43,两个胶层能够更好的将第二极耳41上的焊印412和电芯组件40隔离,一方面,避免焊印412刺穿胶层对电芯组件40产生不利影响;另一方面,避免焊接高温伤及电芯组件40。
可以理解的是,电芯组件40的第二端面与顶盖之间可以设置第二绝缘胶层44,第二绝缘胶层44用于防止电芯组件40与顶盖10之间发生短路,从而有利于保证电池的可靠性和安全性。
本实施例的电池的加工制造过程包括:将电芯组件40的第二极耳41裁切定长后弯折,弯折后的第二极耳41与电芯组件40的端面平行;将电芯组价40放置于壳体10的容置腔内;通过激光焊接或电阻焊接,将电芯组价40的第二极耳41与壳体10焊接连接;将顶盖的第二金属片20与电芯组价40的第一极耳42焊接连接;顶盖翻折后,顶盖的第一金属片13伸入于壳体10顶端的环形台阶槽111内;通过激光焊接,将顶盖的第一金属片13与壳体10焊接连接;以上步骤完成后将半成品的电池放入烤箱内烘烤;烘烤后通过壳体10底部通孔注入电解液;电解液注入后将封口盖14放置在壳体10底部的容置槽122内,通过激光焊接,将封口盖14与壳体10焊接连接;以上步骤完成后进行电性能测试。从而完成电池的加工制造。
在本实用新型的描述中,需要理解的是,术语“顶”、“底”、“上”、“下”(如果存在)等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本实用新型和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本实用新型的限制。
在本实用新型的描述中,需要说明的是,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或一体地连接;可以是机械连接,也可以是电连接;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通。对于本领域的普通技术人员而言,可以通过具体情况理解上述术语在本实用新型中的具体含义。
本申请的说明书和权利要求书及上述附图说明中的术语“第一”、“第二”是用于区别类似的对象,而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换,以便这里描述的本申请的实施例例如能够以除了在这里图示或描述的那些以外的顺序实施。
最后应说明的是:以上各实施例仅用以说明本实用新型的技术方案,而非对其限制;尽管参照前述各实施例对本实用新型进行了详细的说明,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,或者对其中部分或者全部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实用新型各实施例技术方案的范围。

Claims (20)

  1. 一种电池,包括电芯组件和外壳组件,其特征在于,所述外壳组件包括壳体和顶盖,所述壳体和所述顶盖围合成容置腔,所述容置腔用于容置所述电芯组件;
    所述壳体包括相互连接的底壁和环形侧壁,所述底壁和所述顶盖分别位于所述环形侧壁的两端;
    所述底壁上设置有注液孔,所述注液孔处焊接有密封所述注液孔的封口盖。
  2. 根据权利要求1所述的电池,其特征在于,所述顶盖包括具有通孔的第一金属片、绝缘密封件和第二金属片,所述第一金属片与所述环形侧壁的一端连接,所述第二金属片通过所述绝缘密封件连接于所述第一金属片,且封盖所述通孔;
    所述电芯组件具有第一极耳和第二极耳,所述第一极耳和所述第二极耳的电性相反,所述第一极耳与所述第二金属片连接,所述第二极耳与所述壳体或所述第一金属片连接。
  3. 根据权利要求2所述的电池,其特征在于,所述底壁的外表面设置有容置槽,所述注液孔设置在所述容置槽的槽底,且所述注液孔的直径小于所述容置槽的直径;
    所述封口盖位于所述容置槽内,且所述封口盖的直径小于或等于所述容置槽的直径并大于所述注液孔的直径。
  4. 根据权利要求3所述的电池,其特征在于,所述容置槽的直径与所述注液孔的直径的差值大于或等于0.05mm;和/或,
    所述容置槽的直径与所述封口盖的直径的差值范围为0.01mm-2.5mm;和/或,
    所述容置槽的深度范围为0.01mm-0.15mm。
  5. 根据权利要求3所述的电池,其特征在于,所述电芯组件为卷绕式电芯,所述卷绕式电芯的中部具有轴孔,所述注液孔与所述轴孔在所述底壁上的投影至少部分重叠。
  6. 根据权利要求3所述的电池,其特征在于,所述封口盖的边缘与所述容置槽的内壁焊接连接并形成第一焊缝。
  7. 根据权利要求6所述的电池,其特征在于,所述封口盖的边缘与所述容置槽的内壁之间具有缝隙,所述第一焊缝填充了至少部分所述缝隙。
  8. 根据权利要求6所述的电池,其特征在于,所述第一焊缝的表面形成有熔池凹陷,所述熔池凹陷的深度范围为0.005mm-0.05mm。
  9. 根据权利要求3所述的电池,其特征在于,所述封口盖的厚度小于或等于所述容置槽的深度。
  10. 根据权利要求3所述的电池,其特征在于,所述封口盖的中心区域朝向远离所述注液孔的方向凸出;
    所述封口盖的外表面凸出于所述底壁的外表面的高度范围为0.02mm-2mm;和/或,所述封口盖的内表面凸出于所述容置槽的槽底的高度范围为0.01mm-0.05mm。
  11. 根据权利要求2-10中任一项所述的电池,其特征在于,所述注液孔的孔壁靠近所述电芯组件的一端设置为圆弧角;和/或,
    所述注液孔的孔壁远离所述电芯组件的一端设置为圆弧角;
    所述壳体为钢壳体,所述第二金属片为铝合金片。
  12. 根据权利要求2-10中任一项所述的电池,其特征在于,所述环形侧壁的内壁顶端设置有环形台阶槽,所述环形台阶槽的外径小于所述环形侧壁的外径;
    所述第一金属片的外周边缘位于所述环形台阶槽内,且所述第一金属片的外周边缘与所述环形台阶槽的内壁焊接连接形成第二焊缝。
  13. 根据权利要求12所述的电池,其特征在于,所述环形侧壁与所述环形台阶槽同轴设置,且所述环形侧壁的外径与所述环形台阶槽的外径的差值范围为0.1mm-0.18mm。
  14. 根据权利要求2-10中任一项所述的电池,其特征在于,所述绝缘密封件的外周边缘形成有遮挡所述第二金属片的外周边缘的第一绝缘凸起;和/或,
    所述绝缘密封件的内周边缘形成有遮挡所述第一金属片的内边缘的第二绝缘凸起。
  15. 根据权利要求2-10中任一项所述的电池,其特征在于,所述第二金属片的外表面或内表面设置有第一环形凹槽,所述第一环形凹槽的槽底的厚度小于所述第二金属片的厚度;和/或,
    所述底壁的外表面或内表面设置有第二环形凹槽,所述第二环形凹槽的槽底的厚度小于所述底壁的厚度。
  16. 根据权利要求15所述的电池,其特征在于,所述第一环形凹槽包括第一外环凹槽和第一内环凹槽,所述第一内环凹槽设置在所述第一外环凹槽的槽底,且所述第一内环凹槽的槽口宽度小于所述第一外环凹槽的槽口宽度;和/或,
    所述第二环形凹槽包括第二外环凹槽和第二内环凹槽,所述第二内环凹槽设置在所述第二外环凹槽的槽底,且所述第二内环凹槽的槽口宽度小于所述第一外环凹槽的槽口宽度。
  17. 根据权利要求15所述的电池,其特征在于,所述第一环形凹槽的槽底的最小厚度范围为0.02mm-0.1mm。
  18. 根据权利要求15所述的电池,其特征在于,所述第一环形凹槽与所述壳体同轴设置;和/或,
    所述第二环形凹槽与所述壳体同轴设置。
  19. 根据权利要求2-10任一项所述的电池,其特征在于,所述第二极耳与所述底壁焊接连接并形成至少一个焊印;所述第二极耳朝向所述电芯组件的一侧设置有第二极耳保护胶,所述第二极耳保护胶覆盖住所述焊印;
    所述底壁外表面与所述焊印对应的区域无焊印。
  20. 根据权利要求19所述的电池,其特征在于,所述电芯组件的第一端面与所述底壁之间设置有第一绝缘胶层,部分所述第一绝缘胶层位于所述第二极耳保护胶与所述电芯组件的第一端面之间,且部分所述第一绝缘胶层覆盖住所述第二极耳保护胶的对应于所述焊印的位置。
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