Partition plate for use in electrochemical device, electrochemical device, and electronic device

Patent metadata

Field	Value
Publication number	US-2022223968-A1
Application number	US-202217708580-A
Country	US
Kind code	A1
Filing date	Mar 30, 2022
Priority date	Jun 30, 2020
Publication date	Jul 14, 2022
Grant date	—

Abstract

A partition plate for use in an electrochemical device, an electrochemical device, and an electronic device are disclosed. The partition plate for use in an electrochemical device is ion-insulative and includes an intermediate layer and a sealing layer. The sealing layer is located on an upper surface and a lower surface of the intermediate layer. A material of the intermediate layer includes at least one of a carbon material, a first polymer material, or a metal material. A material of the sealing layer includes a second polymer material. A temperature at which the sealing layer starts to soften is at least 10° C. lower than a temperature at which the intermediate layer starts to soften. Three layers of superimposed composite films ensure ion insulation and sealing reliability.

First claim

What is claimed is:

1 . A partition plate for use in an electrochemical device, comprising: an intermediate layer and a sealing layer, and the sealing layer is located on an upper surface and a lower surface of the intermediate layer;
a material of the intermediate layer comprises at least one of a carbon material, a first polymer material, or a metal material; a material of the sealing layer comprises a second polymer material; and a temperature at which the sealing layer starts to soften is at least 10° C. lower than a temperature at which the intermediate layer starts to soften; wherein the partition plate is ion-insulative.

2 . The partition plate according to claim 1 , wherein peripheral edges of the two surfaces of the intermediate layer are overlaid with the sealing layer, and an area of the sealing layer is 30% to 100% of an area of the intermediate layer.

3 . The partition plate according to claim 2 , wherein at least one surface of the intermediate layer is fully overlaid with the sealing layer.

4 . The partition plate according to claim 1 , wherein the carbon material comprises at least one of carbon felt, carbon film, carbon black, acetylene black, fullerene, conductive graphite film, or graphene film.

5 . The partition plate according to claim 1 , wherein the first polymer material comprises at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene glycol naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene glycol, polyamide imide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene difluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene difluoride-hexafluoropropylene), poly(vinylidene difluoride-co-chlorotrifluoroethylene), organosilicon, vinylon, polypropylene, acid anhydride modified polypropylene, polyethylene, ethylene and a copolymer thereof, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone, amorphous α-olefin copolymer, or a derivative of the foregoing substances.

6 . The partition plate according to claim 1 , wherein the metal material comprises at least one of Ni, Ti, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Pb, In, Zn, or stainless steel.

7 . The partition plate according to claim 1 , wherein the second polymer material comprises at least one of polypropylene, acid anhydride modified polypropylene, polyethylene, ethylene and a copolymer thereof, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyamide, polyester, amorphous α-olefin copolymer, or a derivative of the foregoing substances.

8 . The partition plate according to claim 1 , wherein a thickness of the partition plate is 2 μm to 500 μm.

9 . The partition plate according to claim 1 , wherein the temperature at which the material of the intermediate layer starts to soften is higher than 130° C.

10 . The partition plate according to claim 1 , wherein the temperature at which the material of the sealing layer starts to soften is 120° C. to 240° C.

11 . The partition plate according to claim 1 , wherein the partition plate is characterized by at least one of:
(a) a thickness of the partition plate is 5 μm to 50 μm; (b) the temperature at which the material of the intermediate layer starts to soften is higher than 150° C.; or (c) the temperature at which the material of the sealing layer starts to soften is 130° C. to 170° C.

12 . An electrochemical device, comprising: at least one partition plate, at least two electrode assemblies, an electrolytic solution, and an outer package, and the electrode assemblies are located in an independent hermetic chamber; wherein,
the partition plate is ion-insulative and comprises an intermediate layer and a sealing layer, and the sealing layer is located on an upper surface and a lower surface of the intermediate layer; a material of the intermediate layer comprises at least one of a carbon material, a first polymer material, or a metal material; a material of the sealing layer comprises a second polymer material; and a temperature at which the sealing layer starts to soften is at least 10° C. lower than a temperature at which the intermediate layer starts to soften.

13 . The electrochemical device according to claim 12 , wherein an outermost layer of the electrode assemblies contains a separator, and the separator is adjacent to the partition plate.

14 . The electrochemical device according to claim 12 , wherein an outermost layer of at least one of the electrode assemblies contains a separator, and the separator is adjacent to the partition plate; and an outermost layer of at least one of the electrode assemblies contains a current collector, and the current collector is adjacent to the other side of the partition plate.

15 . The electrochemical device according to claim 12 , wherein the partition plate is electrically conductive, an outermost layer of the electrode assemblies contains a current collector, the current collector is adjacent to the partition plate, and current collectors of the electrode assemblies at two sides of the partition plate have opposite polarities.

16 . The electrochemical device according to claim 12 , wherein the partition plate is electrically insulative, and an outermost layer of the electrode assemblies contains a current collector, and the current collector is adjacent to the partition plate.

17 . The electrochemical device according to claim 12 , wherein peripheral edges of the two surfaces of the intermediate layer are overlaid with the sealing layer, and an area of the sealing layer is 30% to 100% of an area of the intermediate layer.

18 . The electrochemical device according to claim 12 , wherein the partition plate is characterized by at least one of:
(a) a thickness of the partition plate is 5 μm to 50 μm; (b) the temperature at which the material of the intermediate layer starts to soften is higher than 150° C.; or (c) the temperature at which the material of the sealing layer starts to soften is 130° C. to 170° C.

19 . An electronic device, wherein the electronic device comprises the electrochemical device according to claim 12 .

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zhang Yibo
• Yan Kun
• Hu Qiaoshu
• Zhang Nan

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/486

  Organic material · CPC title