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CN-122025835-A - Battery cell

CN122025835ACN 122025835 ACN122025835 ACN 122025835ACN-122025835-A

Abstract

The application discloses a battery cell and electric equipment with the battery cell. The battery cell comprises a diaphragm, a first adhesive tape and a plurality of pole pieces, wherein the plurality of pole pieces comprise a positive pole piece and a negative pole piece, the diaphragm comprises a superposition section and an idle section, the superposition section is at least arranged between the positive pole piece and the negative pole piece, the superposition section separates the positive pole piece from the negative pole piece along a Z shape, the superposition section, the positive pole piece and the negative pole piece are superposed to form a superposed core, the idle section is connected with the tail end of the superposition section, the idle section surrounds the superposed core for at least one circle, the first adhesive tape is attached outside the idle section, and the first adhesive tape at least coats one side face and part of the idle section of the superposed core in the superposition direction of the superposed core. According to the battery core, the idle section surrounds the stacked core for at least one circle, so that the idle section can provide binding force for the stacked core to reduce loosening of the internal pole piece, and therefore, the adhesive tape on the other side surface of the stacked core can be reduced or eliminated, and the cost of the battery core is reduced.

Inventors

  • TONG WU

Assignees

  • 阳光电源股份有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (11)

  1. 1. A cell (10) characterized by comprising: a plurality of pole pieces (1), wherein the plurality of pole pieces (1) comprise a positive pole piece (11) and a negative pole piece (12); The separator (2), the separator (2) comprises a superposition section (21) and an idle section (22), the superposition section (21) is at least arranged between the positive electrode sheet (11) and the negative electrode sheet (12), the superposition section (21) separates the positive electrode sheet (11) from the negative electrode sheet (12) along a Z shape, the superposition section (21), the positive electrode sheet (11) and the negative electrode sheet (12) are superposed to form a superposed core (5), the idle section (22) is connected with the tail end of the superposition section (21), and the idle section (22) surrounds the superposed core (5) for at least one circle; The first adhesive tape (3), the first adhesive tape (3) is pasted outside the idle section (22), and the first adhesive tape (3) at least coats one side surface of the laminated core (5) and part of the idle section (22) in the lamination direction of the laminated core (5).
  2. 2. The cell (10) according to claim 1, wherein the pole pieces (1) each comprise a pole piece body (13) and a pole lug (14), the pole lugs (14) are connected with the pole piece bodies (13), the idle section (22) wraps the stacked core (5) in a direction surrounding a first direction, the first direction is a direction in which the pole lugs (14) are connected with the pole piece bodies (13), and the first adhesive tape (3) surrounds the first direction.
  3. 3. The cell (10) according to claim 2, wherein the end of the idle section (22) is located on one side of the stack (5) in a second direction, the first tape (3) is located on the same side of the stack (5) as the end of the idle section (22), the first tape (3) wraps the end of the idle section (22) around the first direction, the second direction is perpendicular to the first direction and perpendicular to the stacking direction of the stack (5).
  4. 4. A cell (10) according to claim 3, wherein the cell (10) further comprises a second tape (4), the second tape (4) being located on the other side of the stack (5) in the second direction, the second tape (4) encircling the first direction, the second tape (4) being attached to the outside of the idle section (22), the second tape (4) wrapping the other side of the stack (5) and part of the idle section (22) at least in the stacking direction of the stack (5).
  5. 5. The electrical cell (10) according to claim 4, wherein the first adhesive tape (3) is a plurality, the plurality of first adhesive tapes (3) are arranged at intervals in the first direction, and the number of the second adhesive tapes (4) is smaller than the number of the first adhesive tapes (3).
  6. 6. The battery cell (10) according to claim 4, wherein the tabs (14) of all the pole pieces (1) are located at the same end of the pole piece body (13) in the first direction, the second adhesive tape (4) is one, and the second adhesive tape (4) is located at one end of the pole piece body (13) connected with the tabs (14).
  7. 7. The cell (10) of claim 6, wherein the tab (14) comprises a positive tab (112) and a negative tab (122), all of the positive tabs (112) being stacked and all of the negative tabs (122) being stacked in a stacking direction of the stacked core (5), the positive tab (112) being spaced apart from the negative tab (122) in the second direction.
  8. 8. The cell (10) according to claim 6 or 7, wherein the pole piece body (13) comprises a negative pole piece body (121) and a positive pole piece body (111), the separator (2) having a size larger than the negative pole piece body (121) on a large face of the stack (5), the negative pole piece body (121) having a size larger than the positive pole piece body (111).
  9. 9. The cell (10) according to claim 8, wherein an end edge of the separator (2) near the tab (14) is a tab end edge, and in the first direction, a dimension of the second tape (4) from the tab end edge is not smaller than a sum of a dimension of the positive electrode sheet body (111) from the same end edge of the negative electrode sheet body (121) and a dimension of the negative electrode sheet body (121) from the tab end edge.
  10. 10. The cell (10) according to claim 4, characterized in that the first tape (3) and the second tape (4) are each configured in a "C" shape.
  11. 11. The cell (10) according to claim 8, wherein in the second direction, the length of the second tape (4) is greater than the difference in dimensions of the positive electrode tab body (111) and the negative electrode tab body (121) in the second direction.

Description

Battery cell Technical Field The application relates to the technical field of batteries, in particular to an electric core. Background In the related art, the battery cell adopting the Z-shaped lamination process can be fixed by sticking adhesive tapes on two sides of the large surface of the inner stacked core, the adhesive tapes on two sides can prevent the battery cell safety risk caused by loosening and falling of the pole pieces in the stacked core, but in order to ensure the fixing effect between the stacked cores, the quantity of the adhesive tapes can be set to be more, so that the overall cost of the battery cell is higher. Disclosure of Invention The present application aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the application provides the battery cell, which is beneficial to reducing the quantity of adhesive tapes and saving the cost. The battery cell comprises a diaphragm, a first adhesive tape and a plurality of pole pieces, wherein the plurality of pole pieces comprise a positive pole piece and a negative pole piece, the diaphragm comprises a superposition section and an idle section, the superposition section is at least arranged between the positive pole piece and the negative pole piece, the superposition section separates the positive pole piece from the negative pole piece along a Z shape, the superposition section, the positive pole piece and the negative pole piece are superposed to form a superposed core, the idle section is connected with the tail end of the superposition section, the idle section surrounds the superposed core for at least one circle, the first adhesive tape is adhered outside the idle section, and the first adhesive tape at least covers one side face of the superposed core and part of the idle section in the superposition direction of the superposed core. According to the battery cell provided by the embodiment of the application, the idle section surrounds the stacked core for at least one circle, so that the idle section can provide binding force for the stacked core to reduce loosening of the internal pole piece, and therefore, the adhesive tape on the other side surface of the stacked core can be reduced or eliminated, and the cost of the battery cell is reduced. According to some embodiments of the application, the pole pieces each comprise a pole piece body and a pole lug, the pole lugs are connected with the pole piece body, the idle section wraps the laminated core in a direction surrounding a first direction, the first direction is the direction in which the pole lugs are connected with the pole piece body, and the first adhesive tape surrounds the first direction. According to some embodiments of the application, the end of the idle section is located on one side of the stack in a second direction, the first tape is located on the same side of the stack as the end of the idle section, the first tape wraps around the end of the idle section in the first direction, and the second direction is perpendicular to the first direction and perpendicular to the stacking direction of the stack. According to some embodiments of the application, the battery cell further comprises a second adhesive tape, the second adhesive tape is located on the other side of the stacked core in a second direction, the second adhesive tape surrounds the first direction, the second adhesive tape is attached to the outside of the idle section, and the second adhesive tape covers at least the other side face of the stacked core and part of the idle section in the stacking direction of the stacked core. According to some embodiments of the application, the first adhesive tape is a plurality of first adhesive tapes, the plurality of first adhesive tapes are arranged at intervals in the first direction, and the number of second adhesive tapes is less than the number of first adhesive tapes. According to some embodiments of the application, the tabs of all the pole pieces are located at the same end of the pole piece body in the first direction, the second adhesive tape is one, and the second adhesive tape is located at one end of the pole piece body connected with the tabs. According to some embodiments of the application, the tabs include positive tabs and negative tabs, all the positive tabs are stacked in a stacking direction of the stacked core, all the negative tabs are stacked, and in the second direction, the positive tabs are spaced apart from the negative tabs. According to some embodiments of the application, the pole piece body comprises a negative pole piece body and a positive pole piece body, the size of the diaphragm is larger than the size of the negative pole piece body on the large face of the laminated core, and the size of the negative pole piece body is larger than the size of the positive pole piece body. According to some embodiments of the application, an edge of the separator near the tab is a tab end edg