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EP-4738447-A1 - ELECTRODE SHEET, ELECTROCHEMICAL DEVICE, AND ELECTRIC DEVICE

EP4738447A1EP 4738447 A1EP4738447 A1EP 4738447A1EP-4738447-A1

Abstract

This application discloses an electrode plate, an electrochemical device, and an electrical device. The electrode plate includes a base portion and a tab. The base portion includes a first edge connected to the tab. The tab includes an extension portion and a connecting portion. Along a length direction of the electrode plate, the extension portion includes a first side edge and a second side edge disposed opposite to each other. The connecting portion includes a third side edge and a fourth side edge disposed opposite to each other. A first connection point is formed between the third side edge and the first side edge. A third connection point is formed between the third side edge and the first edge. A second connection point is formed between the fourth side edge and the second side edge. A fourth connection point is formed between the fourth side edge and the first edge. An extension line of the first side edge intersects the first edge at a first intersection point. An angle between a ray from the first intersection point to the first connection point and a ray from the first intersection point to the fourth connection point is α 1 , satisfying: α 1 < 90°. With a line of connection from the first connection point to the third connection point serving as a first reference line, the connecting portion includes a first reinforcing region defined by the third side edge and the first reference line. This application alleviates the problems of bending and tearing of the tab.

Inventors

  • CHEN, Tengteng

Assignees

  • Ningde Amperex Technology Limited

Dates

Publication Date
20260506
Application Date
20230630

Claims (10)

  1. An electrode plate, comprising a base portion and a tab, wherein, along a length direction of the electrode plate, the base portion comprises a first edge connected to the tab, characterized in that , the tab comprises: an extension portion, wherein, along the length direction of the electrode plate, the extension portion comprises a first side edge and a second side edge disposed opposite to each other; a connecting portion, wherein the connecting portion is located between the base portion and the extension portion; along the length direction of the electrode plate, the connecting portion comprises a third side edge and a fourth side edge disposed opposite to each other; the third side edge is connected to the first edge and the first side edge; the fourth side edge is connected to the first edge and the second side edge; a first connection point is formed between the third side edge and the first side edge; a second connection point is formed between the fourth side edge and the second side edge; a third connection point is formed between the third side edge and the first edge; and a fourth connection point is formed between the fourth side edge and the first edge; when viewed along a thickness direction of the tab, an extension line of the first side edge intersects the first edge at a first intersection point; the first intersection point is located between the third connection point and the fourth connection point; an angle between a ray from the first intersection point to the first connection point and a ray from the first intersection point to the fourth connection point is α 1 , satisfying: α 1 < 90 °; and when viewed along the thickness direction of the tab, with a line of connection from the first connection point to the third connection point serving as a first reference line, the connecting portion comprises a first reinforcing region, and the first reinforcing region is defined by the third side edge and the first reference line.
  2. The electrode plate according to claim 1, characterized in that , the third side edge comprises a fifth side edge and a sixth side edge, the fifth side edge is connected to the first side edge, the sixth side edge is connected to the first edge, and an angle between the fifth side edge and the sixth side edge is δ 1 , satisfying 90° < δ 1 < 180°.
  3. The electrode plate according to claim 2, characterized in that , the electrode plate satisfies: 180° - α 1 < δ 1 .
  4. The electrode plate according to claim 1, characterized in that , the electrode plate satisfies at least one of the following conditions: (1) the third side edge comprises a fifth side edge and a sixth side edge, a fifth connection point is formed between the fifth side edge and the sixth side edge, the fifth side edge is connected to the first side edge, the sixth side edge is connected to the first edge, and an angle between a ray from the third connection point to the fifth connection point and a ray from the third connection point to the fourth connection point is β 1 , satisfying β 1 ≤ α 1 < 90°, and/or 60° ≤ β 1 ≤ 90°; or (2) along a width direction of the electrode plate, a height of the tab is H, and a height of the connecting portion is h, satisfying: h/H ≥ 1/5.
  5. The electrode plate according to claim 1, characterized in that , when viewed along the thickness direction of the tab, an extension line of the second side edge intersects the first edge at a second intersection point; the second intersection point is located between the third connection point and the fourth connection point; and an angle between a ray from the second intersection point to the second connection point and a ray from the second intersection point to the third connection point is a 2 , satisfying: α 2 < 90°; and when viewed along the thickness direction of the tab, with a line of connection from the second connection point to the fourth connection point serving as a second reference line, the connecting portion further comprises a main region and a second reinforcing region, the main region is located between the first reference line and the second reference line, and the second reinforcing region is defined by the fourth side edge and the second reference line.
  6. The electrode plate according to claim 5, characterized in that , the fourth side edge comprises a seventh side edge and an eighth side edge, a sixth connection point is formed between the seventh side edge and the eighth side edge, the seventh side edge is connected to the second side edge, and the eighth side edge is connected to the first edge, satisfying at least one of the following conditions: (1) an angle between the seventh side edge and the eighth side edge is δ 2 , satisfying: 90° < δ 2 < 180°; (2) an angle between a ray from the fourth connection point to the sixth connection point and a ray from the fourth connection point to the third connection point is β 2 , satisfying: β 2 ≤ α 2 < 90°, and/or 60° ≤ β 2 ≤ 90°; or (3) a distance between the first intersection point and the second intersection point is L, and a distance between the third connection point and the fourth connection point is L 1 , satisfying: L 1 ≥ 1.1 × L.
  7. The electrode plate according to claim 6, characterized in that , the electrode plate satisfies: 180° - α 2 < δ 2 .
  8. The electrode plate according to claim 1, characterized in that , the electrode plate satisfies at least one of the following conditions: (1) the third side edge comprises at least one of a fold line or an arc line; (2) the fourth side edge comprises at least one of a fold line or an arc line; (3) the base portion comprises a current collector and a first active material layer, and the first active material layer is disposed on a surface of the current collector; or (4) the electrode plate is a negative electrode plate, the negative electrode plate further comprises a second active material layer, and the second active material layer is disposed on a surface of the connecting portion; or, the electrode plate is a positive electrode plate, the positive electrode plate further comprises a first insulation layer, and the first insulation layer is disposed on a surface of the connecting portion.
  9. An electrochemical device, characterized in that , the electrochemical device comprises a wound type electrode assembly, and the electrode assembly comprises the electrode plate according to any one of claims 1 to 8.
  10. An electrical device, characterized in that , the electrical device comprises the electrochemical device according to claim 9.

Description

TECHNICAL FIELD This application relates to the technical field of energy storage, and in particular, to an electrode plate, an electrochemical device, and an electrical device. BACKGROUND For the battery with a multi-tab structure, the current can be led out through a plurality of tabs to greatly shorten a conduction path of electrons in an electrode plate, so that it can meets the requirement of high rate usage of the electrical devices, such as mobile phones, laptops, unmanned aerial vehicles, electric tools, electric vehicles, and electric two-wheelers, and therefore, has been widely used. SUMMARY However, the inventor of this application finds through research that existing electrode plates with a multi-tab structure are prone to bending and inward insertion during the production and winding, thereby affecting the production yield rate severely. In addition, the batteries with a multi-tab structure pose higher risk of tearing the tab during an impact caused by factors such as dropping, thereby affecting the normal use of electrical device. In view of the above situation, this application provides an electrode plate, an electrochemical device, and an electrical device to alleviate the phenomena of bending and inward insertion of the tab during production, improve the production yield rate of the electrochemical device, reduce the risk of tearing the tab at the root of the tab during an impact caused by factors such as dropping of the electrochemical device, and improve the reliability of the electrochemical device in use. According to a first aspect, this application provides an electrode plate. The electrode plate includes a base portion and a tab. Along a length direction of the electrode plate, the base portion includes a first edge connected to the tab. The tab includes an extension portion and a connecting portion. Along the length direction of the electrode plate, the extension portion includes a first side edge and a second side edge disposed opposite to each other. The connecting portion is located between the base portion and the extension portion. Along the length direction of the electrode plate, the connecting portion includes a third side edge and a fourth side edge disposed opposite to each other. The third side edge is connected to the first edge and the first side edge. The fourth side edge is connected to the first edge and the second side edge. A first connection point is formed between the third side edge and the first side edge. A second connection point is formed between the fourth side edge and the second side edge. A third connection point is formed between the third side edge and the first edge. A fourth connection point is formed between the fourth side edge and the first edge. When viewed along a thickness direction of the tab, an extension line of the first side edge intersects the first edge at a first intersection point. The first intersection point is located between the third connection point and the fourth connection point. An angle between a ray from the first intersection point to the first connection point and a ray from the first intersection point to the fourth connection point is α1, satisfying: α1 < 90°. When viewed along the thickness direction of the tab, with a line of connection from the first connection point to the third connection point serving as a first reference line, the connecting portion includes a first reinforcing region. The first reinforcing region is defined by the third side edge and the first reference line. By setting the angle to satisfy α1 < 90°, the first side edge of the tab is tilted. By disposing the first reinforcing region between the third side edge and the first reference line, the first-side swing stiffness and torsional stiffness of the tab are improved, thereby suppressing the bending and inward insertion of the tab during production and winding, improving the production yield rate of the electrochemical device, and also reducing the risk of tearing the tab at the root of the tab during an impact caused by factors such as dropping of the electrochemical device, and consequently improving the reliability of the electrochemical device in use. In some embodiments, the third side edge includes a fifth side edge and a sixth side edge. The fifth side edge is connected to the first side edge. The sixth side edge is connected to the first edge. An angle between the fifth side edge and the sixth side edge is δ1, satisfying 90° < δ1 < 180°. In this way, the first reinforcing region assumes an obtuse-angle structure, thereby improving the swing stiffness and torsional stiffness of the tab, further suppressing the bending and inward insertion of the tab during production and winding, improving the production yield rate of the electrochemical device, further reducing the risk of tearing the tab at the root of the tab during an impact caused by factors such as dropping of the electrochemical device, and improving the reliability of the electroch