Battery pole piece and secondary battery adopting battery pole piece

A battery pole piece and pole piece technology, which is applied in the direction of secondary battery, battery electrode, electrode collector coating, etc., can solve the problem that the insulating adhesive layer occupies the battery and affects the full improvement of energy density, so as to reduce superposition, The effect of increasing the capacity density and increasing the coating amount

CN105576191AInactive Publication Date: 2016-05-11NINGDE AMPEREX TECH
5 Cites 17 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-05-11
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to the field of energy storage elements and in particular relates to a battery pole piece and a secondary battery adopting the battery pole piece. The battery pole piece provided by the invention comprises a tab, a current collector and at least one membrane attached to at least one surface of the current collector, wherein a groove is formed in the membrane; the tab is embedded into the groove and is electrically connected with the current collector; the tab comprises an embedded part embedded into the groove and an exposed part exposed out of the groove; an active matter covering layer covers the upper surface of the embedded part. With the adoption of the embedded type tab, the membrane covers the surface of the embedded part and insulating glue paper does not need to be used; the superposition of the thickness of the tab on the thickness of a battery cell is reduced; the superposition of the thickness of insulating glue on the thickness of the tab is reduced, and the capacity density of the battery is improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present application relates to the field of energy storage elements, in particular, to a battery pole piece and a secondary battery using the battery pole piece. Background technique

[0002] Lithium-ion batteries have been widely used in mobile and portable electrical appliances due to their advantages such as high energy density, high average open circuit voltage and long cycle life. The pole piece of a commercial lithium-ion battery includes a current collector, tabs and an active material layer, wherein the active material layer is a continuous and uniform coating. The cathode pole piece, the anode pole piece and the separator together form the battery core, and the thickness of the battery core is composed of the thickness of the cathode pole piece and the anode pole piece, the thickness of the separator film, and the thickness of the tab. In different parts of the cell, the thickness is not the same, and the thickness at the welding tab is t...

Examples

Embodiment 1

[0074] Taking the 494090 soft-pack lithium-ion battery (the thickness of the finished battery is 4.9mm, the width is 40mm, and the length is 90mm) as an example, the size of the anode tab 2 and the cathode tab 4 are the same, the welding length of the tab is 15mm, and the width of the tab is 6mm, thickness 0.06mm.

[0075] The cathode piece 3 of the battery includes a cathode tab 4, a cathode current collector 31, and a cathode diaphragm 32 attached to both surfaces of the cathode current collector. The cathode diaphragm 32 is provided with a first groove G31, and the cathode tab 4 is embedded in the The inside of the first groove G31 is electrically connected to the cathode current collector 31, and the cathode tab 4 includes a first inlay part embedded in the first groove G31 and a first exposed part exposed to the first groove G31. The upper surface of the insert is covered with a cathode active material coating layer 33 . The cathode diaphragm 32 and the cathode active ma...

Embodiment 2

[0081] Taking the 494090 soft-pack lithium-ion battery (the thickness of the finished battery is 4.9mm, the width is 40mm, and the length is 90mm) as an example, the size of the anode tab 2 and the cathode tab 4 are the same, that is, the welding length of the tab is 15mm, and the width of the tab is It is 6mm and the thickness is 0.06mm.

[0082] The anode sheet 1 of the battery includes an anode tab 2, an anode current collector 11, and an anode diaphragm 12 attached to both surfaces of the anode current collector. The anode diaphragm 12 is provided with a second groove G11, and the anode tab 2 is embedded in the The second groove G11 is also electrically connected to the anode current collector 11, the anode tab 2 includes a second inlay portion embedded in the second groove G11 and a second exposed portion exposed to the second groove G11, the second inner The upper surface of the insert is covered with an anode active material coating layer 13 . The anode membrane 12 and...

Embodiment 3

[0089] Taking the 494090 soft-pack lithium-ion battery (the thickness of the finished battery is 4.9mm, the width is 40mm, and the length is 90mm) as an example, the size of the anode tab 2 and the cathode tab 4 are the same, that is, the welding length of the tab is 15mm, and the width of the tab is It is 6mm and the thickness is 0.06mm.

[0090] The cathode pole piece 3 of the battery includes a cathode tab 4, a cathode current collector 31, and a cathode diaphragm 32 attached to at least one surface of the cathode current collector. The cathode diaphragm 32 is provided with a first groove G31, and the cathode tab 4 is inlaid Electrically connected to the cathode current collector 31 in the first groove G31, the cathode tab 4 includes a first inlay portion embedded in the first groove G31 and a first exposed portion exposed to the first groove, the first inner The upper surface of the insert is covered with a cathode active material coating layer 33 . The cathode diaphragm ...