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Electrochemical device and electronic device including the same

An electrochemical and encapsulation layer technology, applied in the field of electrochemistry, can solve problems such as reducing the volumetric energy density of lithium-ion batteries, and achieve the effects of improving the drop pass rate, ensuring reliability, and improving safety performance

Pending Publication Date: 2022-07-08
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome this problem, existing lithium-ion batteries usually use a relatively large-sized packaging case to accommodate the expansion of the electrode assembly. This dead volume (the volume reserved for the expansion) is usually 1 / 2 of the total volume of the lithium-ion battery. By about 15% to about 20%, the presence of this dead volume reduces the volumetric energy density of Li-ion batteries

Method used

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  • Electrochemical device and electronic device including the same
  • Electrochemical device and electronic device including the same
  • Electrochemical device and electronic device including the same

Examples

Experimental program
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preparation example Construction

[0050] The present application does not specifically limit the preparation process of the electrochemical device 001, as long as the purpose of the present application can be achieved. For example, the electrochemical device 001 can be prepared by the following process: the positive electrode and the negative electrode are overlapped through a separator, and then rolled or folded as required, and then placed into the packaging case 40, and the electrolyte is injected into the packaging case 40. inside and sealed. In addition, if necessary, an overcurrent preventing element, a guide plate, etc. may be placed in the case to prevent pressure rise and overcharge and discharge inside the electrochemical device 001 .

[0051] A second aspect of the present application provides an electronic device, including the electrochemical device 001 provided in the first aspect of the present application. The electronic device has good energy density and safety performance.

[0052] The elec...

Embodiment 1

[0067]

[0068] Prepare a batch of first electrode assemblies and a batch of second electrode assemblies respectively, select one of the first electrode assemblies to prepare the first battery, select one of the second electrode assemblies to prepare the second battery, and then separate the first battery and the second battery. Carry out a cycle test to calculate the expansion rate, consider the expansion rate of the first battery as the expansion rate of the first electrode assembly, the size is 10%, and the expansion rate of the second battery is considered as the expansion rate of the second electrode assembly, the size is 2% .

[0069]

[0070] The encapsulation layer material PP is uniformly dispersed in the dispersant N-methylpyrrolidone (NMP) to prepare a suspension of the encapsulation layer material; using a glue applicator, the encapsulation part on both surfaces of the separator Al foil with a thickness of 10 μm is applied. Coating the encapsulation layer mater...

Embodiment 2

[0077] It was the same as Example 1 except that the thickness of the separator was 20 μm and the elongation δ=25% in .

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PUM

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Abstract

The invention provides an electrochemical device and an electronic device comprising the electrochemical device. The electrochemical device comprises a packaging shell, a partition plate, a first electrode assembly and a second electrode assembly, the partition plate comprises a packaging part and a main body part, the packaging part is connected with the packaging shell, and the packaging shell defines a first cavity and a second cavity on the two sides of the partition plate respectively; the stretch rate delta of the separator is not less than 10%; the first electrode assembly and the second electrode assembly are correspondingly arranged in the first cavity and the second cavity. The electrochemical device and the electronic device have good expansion performance, energy density and safety performance.

Description

technical field [0001] The present application relates to the field of electrochemistry, and in particular, to an electrochemical device and an electronic device including the electrochemical device. Background technique [0002] Lithium-ion batteries are used in electrical appliances. Since the remaining space for lithium-ion batteries in electrical appliances is getting smaller and smaller, the back cover of electrical appliances is close to the outer wall of lithium-ion batteries, and lithium-ion batteries are slightly swelled and deformed. The cover cannot be closed and cannot be used normally. In addition, the lithium-ion battery with aluminum-plastic film as the packaging shell cannot withstand the strong air pressure inside it, and the expansion and deformation of the lithium-ion battery will increase the risk of liquid leakage. Therefore, the swelling phenomenon has become an important factor affecting the qualification rate and safety performance of lithium-ion bat...

Claims

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Application Information

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IPC IPC(8): H01M50/414H01M50/463H01M50/193H01M10/0525
CPCH01M50/414H01M50/463H01M50/193H01M10/0525Y02P70/50Y02E60/10
Inventor 李晨晨盛阳平丁宇
Owner NINGDE AMPEREX TECH