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US-12626948-B2 - Battery cell structure of button battery and munufactuturn merhod thereof, and button battery

US12626948B2US 12626948 B2US12626948 B2US 12626948B2US-12626948-B2

Abstract

The present disclosure provides a battery cell structure of a button battery and a manufacturing method thereof, and a button battery, where the battery cell structure of the button battery includes a winding core which is formed by winding a laminated structure and is provided with a hollow inner hole, the laminated structure includes at least one positive electrode sheet, at least one negative plate, and a separator which separates the at least one positive electrode sheet from the at least one negative electrode sheet, at least two ends of the winding core are provided with a separator bonding layer wrapping the winding core, and the separator bonding layer is used for fixing the positive electrode sheet and the negative electrode sheet.

Inventors

  • Yongwang Wang
  • Yuxiang Zeng

Assignees

  • ZHUHAI COSMX BATTERY CO., LTD.

Dates

Publication Date
20260512
Application Date
20230103
Priority Date
20201217

Claims (18)

  1. 1 . A battery cell structure of a button battery, comprising a winding core ( 10 ) which is formed by winding a laminated structure and is provided with a hollow inner hole ( 14 ), wherein the winding core ( 10 ) is provided with a first tab ( 20 ) and a second tab ( 30 ), the laminated structure comprises at least one positive electrode sheet ( 11 ), at least one negative plate ( 12 ), and a separator ( 13 ) which separates the at least one positive electrode sheet ( 11 ) from the at least one negative electrode sheet ( 12 ), characterized in that, at least two ends of the winding core ( 10 ) are provided with a separator bonding layer ( 132 ) wrapping the winding core ( 10 ), and the separator bonding layer ( 132 ) is configured to fix a positive electrode sheet ( 11 ) and a negative electrode sheet ( 12 ), wherein when the first tab ( 20 ) is located at an outer ring of the winding core ( 10 ), the separator ( 13 ) is disposed at an outer side of the positive electrode sheet ( 11 ) or the negative electrode sheet ( 12 ) connected to the first tab ( 20 ); the separator bonding layer ( 132 ) comprises a first separator bonding layer located at an inner side of the first tab ( 20 ) and a second separator bonding layer located at an outer side of the first tab ( 20 ), and a bonding force of the first separator bonding layer is greater than that of the second separator bonding layer.
  2. 2 . The battery cell structure of the button battery according to claim 1 , wherein the separator ( 13 ) extends outwards from both ends of the winding core ( 10 ) respectively and forms protruding ends ( 131 ), the protruding ends ( 131 ) are inclined toward a direction of the hollow inner hole ( 14 ) of the winding core ( 10 ), and adjacent protruding ends ( 131 ) are bonded with each other to form the separator bonding layer ( 132 ).
  3. 3 . The battery cell structure of the button battery according to claim 2 , wherein a width D of the protruding ends ( 131 ) is greater than or equal to a sum of a thickness of the positive electrode sheet ( 11 ), a thickness of the negative electrode sheet ( 12 ), and a thickness of the separator ( 13 ).
  4. 4 . The battery cell structure of the button battery according to claim 3 , wherein when the first tab ( 20 ) is located at an inner ring of the winding core ( 10 ), the separator ( 13 ) is disposed at an inner side of the positive electrode sheet ( 11 ) or the negative electrode sheet ( 12 ) connected to the first tab ( 20 ); the separator bonding layer ( 132 ) comprises a second separator bonding layer located at an inner side of the first tab ( 20 ) and a first separator bonding layer located at an outer side of the first tab ( 20 ), and a bonding force of the first separator bonding layer is greater than that of the second separator bonding layer.
  5. 5 . The battery cell structure of the button battery according to claim 1 , wherein an area of the second separator bonding layer covering the first tab ( 20 ) accounts for 5% to 30% of an area of the first tab ( 20 ).
  6. 6 . The battery cell structure of the button battery according to claim 4 , wherein an area of the second separator bonding layer covering the first tab ( 20 ) accounts for 5% to 30% of an area of the first tab ( 20 ).
  7. 7 . The battery cell structure of the button battery according to claim 1 , wherein before the separator bonding layer ( 132 ) is formed, the separator ( 13 ) has a width A of 4 mm-10 mm, and after the separator bonding layer ( 132 ) is formed, the separator ( 13 ) has a width A 2 of 3 mm-9 mm.
  8. 8 . The battery cell structure of the button battery according to claim 4 , wherein before the separator bonding layer ( 132 ) is formed, the separator ( 13 ) has a width A of 4 mm-10 mm, and after the separator bonding layer ( 132 ) is formed, the separator ( 13 ) has a width A 2 of 3 mm-9 mm.
  9. 9 . The battery cell structure of the button battery according to claim 7 , wherein the positive electrode sheet ( 11 ) has a width B of 2 mm-8 mm, and the negative electrode sheet ( 12 ) has a width C of 2.5 mm-8.5 mm.
  10. 10 . The battery cell structure of the button battery according to claim 8 , wherein the positive electrode sheet ( 11 ) has a width B of 2 mm-8 mm, and the negative electrode sheet ( 12 ) has a width C of 2.5 mm-8.5 mm.
  11. 11 . A button battery comprising the battery cell structure of the button battery according to claim 1 , wherein the button battery further comprises a housing ( 50 ) in which a holding cavity ( 51 ) for holding the battery cell structure of the button battery is provided, a bent portion ( 21 ) of the first tab ( 20 ) is located on at least one end face of the winding core ( 10 ), the bent portion ( 21 ) of the first tab ( 20 ) contacts the separator bonding layer ( 132 ), and the bent portion ( 21 ) of the first tab ( 20 ) is electrically connected to an end face of the housing ( 50 ).
  12. 12 . The button battery according to claim 11 , wherein the separator ( 13 ) extends outwards from both ends of the winding core ( 10 ) respectively and forms protruding ends ( 131 ), the protruding ends ( 131 ) are inclined toward a direction of the hollow inner hole ( 14 ) of the winding core ( 10 ), and adjacent protruding ends ( 131 ) are bonded with each other to form the separator bonding layer ( 132 ).
  13. 13 . The button battery according to claim 12 , wherein a width D of the protruding ends ( 131 ) is greater than or equal to a sum of a thickness of the positive electrode sheet ( 11 ), a thickness of the negative electrode sheet ( 12 ), and a thickness of the separator ( 13 ).
  14. 14 . The button battery according to claim 13 , wherein when the first tab ( 20 ) is located at an inner ring of the winding core ( 10 ), the separator ( 13 ) is disposed at an inner side of the positive electrode sheet ( 11 ) or the negative electrode sheet ( 12 ) connected to the first tab ( 20 ); the separator bonding layer ( 132 ) comprises a second separator bonding layer located at an inner side of the first tab ( 20 ) and a first separator bonding layer located at an outer side of the first tab ( 20 ), and a bonding force of the first separator bonding layer is greater than that of the second separator bonding layer.
  15. 15 . The button battery according to claim 11 , wherein an area of the second separator bonding layer covering the first tab ( 20 ) accounts for 5% to 30% of an area of the first tab ( 20 ).
  16. 16 . The button battery according to claim 14 , wherein an area of the second separator bonding layer covering the first tab ( 20 ) accounts for 5% to 30% of an area of the first tab ( 20 ).
  17. 17 . The button battery according to claim 11 , wherein before the separator bonding layer ( 132 ) is formed, the separator ( 13 ) has a width A of 4 mm-10 mm, and after the separator bonding layer ( 132 ) is formed, the separator ( 13 ) has a width A 2 of 3 mm-9 mm.
  18. 18 . The button battery according to claim 14 , wherein before the separator bonding layer ( 132 ) is formed, the separator ( 13 ) has a width A of 4 mm-10 mm, and after the separator bonding layer ( 132 ) is formed, the separator ( 13 ) has a width A 2 of 3 mm-9 mm.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application is a continuation of International Application No. PCT/CN2021/138942, filed on Dec. 16, 2021, which claims priority to Chinese Patent Application No. 202011496907.3, entitled with “BATTERY CELL STRUCTURE OF BUTTON BATTERY AND MANUFACTURING METHOD THEREOF, AND BUTTON BATTERY”, filed with China National Intellectual Property Administration on Dec. 17, 2020. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD The present disclosure relates to the technical field of batteries, and, in particular, to a battery cell structure of a button battery and a manufacturing method thereof, and a button battery. BACKGROUND Button batteries have the advantages of stable discharge voltage, wide working temperature range, long storage life and so on, and are widely used in various electronic products. The demand for button batteries in wearable devices such as wireless headphones, sports watches, bracelets, turns and so on is increasing. Button batteries need to improve the safety for long-term use in harsh environments, particularly in bumpy environments. However, limited by the development of industrial manufacturing level, and market demand, button batteries in the market are mainly primary batteries, while secondary button lithium-ion batteries are basically not sold in the market. Miniaturized electronic products have high requirements for the space size of battery products, and button batteries pose a huge challenge to manufacturing technology due to the reduction of battery size and the improvement of requirements for size consistency. Button batteries with steel housing structure can meet people's needs better. In harsh environments, particularly in bumpy environments or in the case of falling, the battery cell of the existing button battery is easy to generate a phenomenon that a positive electrode sheet and a negative electrode sheet move and shift, resulting in a short circuit caused by contacting with a metal housing, which affects the use safety. Under this demand, we urgently need to provide a secondary hard-housing micro lithium-ion battery to meet the needs of the majority of users. By improving a battery cell structure of a button battery and a manufacturing method thereof, and a button battery, the phenomenon that a positive electrode sheet and a negative electrode sheet are easy to move and shift can be effectively solved, thereby avoiding a short circuit caused by contacting with a metal housing in a button battery. SUMMARY The present disclosure provides a battery cell structure of a button battery and a manufacturing method thereof, and a button battery, for at least solving the technical problem that a positive electrode sheet and a negative electrode sheet are easy to move and shift, thereby avoiding a short circuit caused by the contact of the positive electrode sheet and the negative electrode sheet with a housing in the button battery, and improving the use safety of button batteries. In order to achieve the above purpose, the present disclosure provides a battery cell structure of a button battery, including a winding core which is formed by winding a laminated structure and is provided with a hollow inner hole, where the winding core is provided with a first tab and a second tab, the laminated structure includes at least one positive electrode sheet, at least one negative plate, and a separator which separates the at least one positive electrode sheet from the at least one negative electrode sheet, at least two ends of the winding core are provided with a separator bonding layer wrapping the winding core, and the separator bonding layer is configured to fix the positive electrode sheet and the negative electrode sheet. In the present disclosure, the separator bonding layer is disposed such that the separator bonding layer wraps the two ends of the winding core, and thus the separator bonding layer covers and wraps the positive electrode sheet and the negative electrode sheet, and wraps the positive electrode sheet or the negative electrode sheet in a sealed region. This limits the positive electrode sheet or the negative electrode sheet to move and shift, so that it can be ensured that the positive electrode sheet and the negative electrode sheet do not come out of the winding core even under severe vibration conditions, for example, in the cases of running or falling, thereby avoiding a short circuit cause by the contact of the positive electrode sheet/or the negative electrode sheet with a battery housing, and improving the use safety of the battery cell structure of the button battery. In a possible embodiment, the separator extends outwards from both ends of the winding core respectively and forms protruding ends, the protruding ends are inclined toward the direction of the inner hole of the winding core, and the adjacent protruding ends are bonded with each o