Search

CN-224217514-U - Single battery

CN224217514UCN 224217514 UCN224217514 UCN 224217514UCN-224217514-U

Abstract

The application provides a single battery, which comprises a shell, a cover plate assembly, an electrode assembly, a lithium supplementing structure and a battery, wherein the cover plate assembly is connected with the shell and forms a first accommodating cavity, the cover plate assembly is provided with an anode terminal assembly and a cathode terminal assembly, the electrode assembly is respectively and electrically connected with the anode terminal assembly and the cathode terminal assembly in the first accommodating cavity, the lithium supplementing structure is positioned in the first accommodating cavity and comprises a lithium source, an insulating support and a conductive part, the insulating support is positioned between the cathode terminal assembly and the electrode assembly, the conductive part is electrically connected with a lithium source lug extending from the lithium source and is positioned between the insulating support and the cathode terminal assembly, when the electrode assembly expands, the insulating support is pushed to drive the conductive part to be in contact conduction with the cathode terminal assembly, and the lithium supplementing structure in the application utilizes the expansion process of the electrode assembly to supplement lithium to reduce lithium loss in the battery, thereby being beneficial to maintaining the battery capacity and prolonging the service life of the battery.

Inventors

  • XING YUQI
  • Che Peipei
  • LIU JINHUA

Assignees

  • 远景动力技术(鄂尔多斯市)有限公司
  • 远景睿泰动力技术(上海)有限公司
  • 远景动力技术(江苏)有限公司

Dates

Publication Date
20260508
Application Date
20250418

Claims (10)

  1. 1. A single cell, characterized by comprising: A housing; The cover plate assembly is connected with the shell and forms a first accommodating cavity, and is provided with a positive terminal assembly and a negative terminal assembly; An electrode assembly electrically connected with the positive terminal assembly and the negative terminal assembly, respectively, in the first receiving chamber; The lithium supplementing structure is positioned in the first accommodating cavity and comprises a lithium source, an insulating bracket and a conductive part, wherein the insulating bracket is positioned between the negative electrode terminal assembly and the electrode assembly; when the electrode assembly expands, the insulating support is pushed to drive the conductive part to be in contact conduction with the negative electrode terminal assembly.
  2. 2. The cell as defined in claim 1, wherein the cover assembly comprises: the positive electrode terminal assembly and the negative electrode terminal assembly are arranged on the cover body; The lower plastic is arranged in the first accommodating cavity and is positioned between the cover body and the electrode assembly, and a second accommodating cavity for accommodating the insulating bracket and the conductive part is formed in one side of the lower plastic facing the electrode assembly.
  3. 3. The cell as defined in claim 2, further comprising: A first elastic sheet, two ends of which are fixed on the peripheral wall of the second accommodating cavity, extend along the first direction and are respectively connected with the conductive part and the lithium source lug, The first elastic sheet is positioned between the positive terminal assembly and the negative terminal assembly in the second direction and positioned between the lower plastic and the electrode assembly in the third direction; The first direction, the second direction and the third direction are the width direction, the length direction and the thickness direction of the cover plate component in sequence.
  4. 4. The cell of claim 3, wherein the negative terminal assembly comprises: The negative terminal penetrates through the lower plastic and is electrically connected with a negative electrode tab extending out of the electrode assembly, and a space exists between the negative terminal and the first elastic sheet in the second direction; or include negative pole terminal and negative pole change piece, negative pole terminal runs through lower plastic, negative pole change piece with negative pole terminal is close to one side of electrode assembly is connected, just negative pole change piece with first shell fragment is in there is the interval in the second direction.
  5. 5. The cell according to claim 3, further comprising: A second spring plate positioned between the electrode assembly and the insulating bracket for supporting the insulating bracket, The two ends of the second elastic sheet are fixed on the peripheral wall of the second accommodating cavity and extend along the first direction.
  6. 6. The battery cell as recited in claim 3, wherein the conductive member is a conductive tab having one end located between the negative terminal assembly and the insulating support and the other end electrically connected to the lithium source ear, When the electrode assembly expands, the insulating support is pushed to drive the conductive connecting sheet to be in contact conduction with the negative terminal assembly; Or comprises a conductive connecting sheet and a metal elastic sheet, wherein one end of the conductive connecting sheet is connected with the lithium source lug, the other end of the conductive connecting sheet is connected with the metal elastic sheet, the metal elastic sheet is positioned between the negative terminal assembly and the insulating bracket, the two ends of the metal elastic sheet are fixed on the peripheral wall of the second accommodating cavity and extend along the first direction, When the electrode assembly expands, the insulating support is pushed to drive the metal elastic sheet to switch from a first state to a second state, a gap exists between the metal elastic sheet and the negative terminal assembly when the metal elastic sheet is in the first state, and the metal elastic sheet is in contact and conduction with the negative terminal assembly when the metal elastic sheet is in the second state.
  7. 7. The unit cell according to claim 1, wherein the electrode assembly comprises: The positive pole piece, the diaphragm and the negative pole piece are alternately laminated in turn, the diaphragm is used for isolating the positive pole piece and the negative pole piece, The positive pole piece, the negative pole piece and the diaphragm are wound to form a coiled structure, the positive pole piece extends out of the positive pole lug to be electrically connected with the positive terminal assembly, and the negative pole piece extends out of the negative pole lug to be electrically connected with the negative terminal assembly; The lithium source is positioned between the adjacent negative electrode plate and the diaphragm, and the lithium source lug is positioned between the positive electrode lug and the negative electrode lug.
  8. 8. The battery cell of claim 7, wherein the lithium source is a lithium metal layer, Along the arrangement directions of the positive electrode plate, the diaphragm and the negative electrode plate, the lithium source is positioned close to the center of the electrode assembly and is arranged between the negative electrode plate and the diaphragm; And/or, along the arrangement direction of the positive electrode plate, the diaphragm and the negative electrode plate, the lithium source is far away from the center of the electrode assembly and close to the shell, and is arranged between the negative electrode plate and the diaphragm.
  9. 9. The unit cell according to claim 7, wherein at least one side of the negative electrode tab and the positive electrode tab is covered with an active layer; According to the arrangement direction of the positive electrode plate, the diaphragm and the negative electrode plate, the thickness ratio between the lithium source and the active layer is within the range of 20-50%.
  10. 10. The unit cell according to claim 9, wherein the height of the lithium source in the thickness direction of the cap plate is smaller than the minimum height of the active layer.

Description

Single battery Technical Field The application relates to the technical field of battery cells, in particular to a single battery. Background Lithium ion batteries consume lithium ions inside the battery and form an SEI (Solid Electrolyte Interphase, solid electrolyte interface) film on the surface of the negative electrode when activated. However, in the cyclic charge and discharge process of the battery, the SEI film on the surface of the negative electrode is continuously thickened and continuously consumes lithium ions, and if the battery is not subjected to lithium supplementation, the electric capacity and the cyclic performance of the battery are gradually reduced, so that the service life of the battery is influenced. Disclosure of utility model In view of the above, the present application is directed to a single battery for solving some or all of the above-mentioned problems. Based on the above object, the present application provides a single battery including: A housing; The cover plate assembly is connected with the shell and forms a first accommodating cavity, and is provided with a positive terminal assembly and a negative terminal assembly; An electrode assembly electrically connected with the positive terminal assembly and the negative terminal assembly, respectively, in the first receiving chamber; the lithium supplementing structure is positioned in the first accommodating cavity and comprises a lithium source, an insulating bracket and a conductive part, wherein the insulating bracket is positioned between the negative terminal assembly and the electrode assembly; when the electrode assembly expands, the insulating support is pushed to drive the conductive part to be in contact conduction with the negative electrode terminal assembly. The lithium supplementing structure comprises a lithium source, an insulating support and a conductive part component, the lithium supplementing structure is simple in structure and low in assembly difficulty, when the battery is subjected to repeated charging and discharging, the electrode component expands compared with an activated state to push the insulating support to drive the conductive part to move towards the negative electrode terminal component until the conductive part is contacted with the negative electrode terminal component and then is conducted with the lithium source, the lithium source can supplement lithium for the negative electrode after the conducting, lithium loss in the battery can be reduced, the battery capacity can be maintained, and the service life of the battery can be prolonged. Drawings In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Fig. 1 is a perspective view of a battery according to an embodiment of the present application; FIG. 2 is a partial cross-sectional view of a battery in an embodiment of the application; FIG. 3 is a perspective view of a cover plate assembly according to an embodiment of the present application; FIG. 4 is a bottom view of a cover plate assembly according to an embodiment of the present application; FIG. 5 is a partial cross-sectional view of a cover plate assembly according to an embodiment of the present application; FIG. 6 is a schematic diagram of a first lithium supplementing structure and a negative terminal assembly according to an embodiment of the present application; FIG. 7 is a schematic diagram of a second lithium-compensating structure and a negative terminal assembly according to an embodiment of the application; FIG. 8 is a schematic diagram of a third lithium-compensating structure and a negative terminal assembly according to an embodiment of the application; FIG. 9 is a schematic diagram of a metal spring plate in a second accommodating cavity according to an embodiment of the present application; Fig. 10 is a perspective view of an electrode assembly according to an embodiment of the present application; FIG. 11 is a schematic view showing the composition of an electrode assembly according to an embodiment of the present application; Fig. 12 is a schematic diagram of a positional relationship between a lithium source and a negative electrode tab in an embodiment of the present application. Reference numerals illustrate: 1. a housing 101, a first accommodation chamber; 2. Cover plate assembly, 201, positive terminal assembly, 202, negative terminal assembly, 2021, negative terminal, 2022, negative switching sheet, 210, cover body, 220, lower plastic, 222 and second accommodating cavity; 3. 310 parts of electrode assembly, 311 parts of positive electrode plate, 320 par