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Lithium-ion battery and manufacturing method thereof

A technology of lithium-ion battery and manufacturing method, which is applied in the field of high-safety lithium-ion battery and its manufacturing, can solve problems such as inability to prevent thermal runaway, and achieve the effect of simple coating and low cost of materials and processes

Pending Publication Date: 2020-04-17
湖南领湃科技股份有限公司 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it cannot prevent thermal runaway due to internal short circuit of the battery

Method used

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  • Lithium-ion battery and manufacturing method thereof
  • Lithium-ion battery and manufacturing method thereof
  • Lithium-ion battery and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Step S1, preparing paint: Mix pentaerythritol, ammonium polyphosphate, melamine, and matrix resin with a high-speed electric mixer for 20 minutes, add expandable graphite, dispersant, and defoamer, continue mixing until uniform, and then set aside for use. Wherein the material ratio is: expandable graphite: pentaerythritol: ammonium polyphosphate: melamine: matrix resin: dispersant: defoamer = 12%: 18%: 20%: 12%: 35%: 2%: 1%.

[0047] Step S2, shell coating: after removing the oxide film inside the battery shell, paint the prepared paint on the inner wall of the battery shell, let it dry naturally at room temperature, repeat the brushing and dry after drying, until the expandable graphite coating When the thickness reaches 4mm, put it in a constant temperature box at 45°C for 24 hours. The function of keeping it warm is to completely remove the moisture that may exist in the coating, so as to avoid the performance degradation of the battery caused by the introduction of ...

Embodiment 2

[0051] Step S1, preparing paint: Mix pentaerythritol, ammonium polyphosphate, melamine, and matrix resin with a high-speed electric mixer for 20 minutes, add expandable graphite, dispersant, and defoamer, continue mixing until uniform, and then set aside for use. Wherein the material ratio is: expandable graphite: pentaerythritol: ammonium polyphosphate: melamine: matrix resin: dispersant: defoamer = 14%: 18%: 18%: 10%: 37%: 2%: 1%.

[0052] Step S2, shell coating: after removing the oxide film inside the battery shell, paint the prepared paint on the inner wall of the battery shell, let it dry naturally at room temperature, repeat the brushing and dry after drying, until the expandable graphite coating When the thickness reaches 3mm, put it in a thermostat at 45°C for 24 hours.

[0053] Step S3, battery cell assembly: After putting the battery cells into the shell, inject liquid, seal, stand still, form, charge at 0.5C to 4.2V, cut off the current at 0.05C, and complete the b...

Embodiment 3

[0056] Step S1, preparing paint: Mix pentaerythritol, ammonium polyphosphate, melamine, and matrix resin with a high-speed electric mixer for 20 minutes, add expandable graphite, dispersant, and defoamer, continue mixing until uniform, and then set aside for use. Wherein the material ratio is: expandable graphite: pentaerythritol: ammonium polyphosphate: melamine: matrix resin: dispersant: defoamer = 12%: 18%: 20%: 12%; 35%: 2%: 1%.

[0057] Step S2, shell coating: after removing the oxide film inside the battery shell, paint the prepared paint on the inner wall of the battery shell, let it dry naturally at room temperature, repeat the brushing and dry after drying, until the expandable graphite coating When the thickness reaches 2mm, put it in a thermostat at 45°C for 24 hours.

[0058] Step S3, battery cell assembly: After putting the battery cells into the shell, inject liquid, seal, stand still, form, charge 4.2V at 0.5C, cut off the current at 0.05C, and complete the batt...

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Abstract

The invention provides a lithium-ion battery and a manufacturing method thereof. The lithium-ion battery comprises a battery shell and a battery cell monomer arranged in the battery shell, and an inner wall of the battery shell is provided with an expandable graphite coating. The manufacturing method of the lithium-ion battery comprises the following steps: preparing a coating material, wherein the main components of the coating material comprise expandable graphite, pentaerythritol, ammonium polyphosphate, melamine and matrix resin; coating an inner wall of the battery shell with the coatingmaterial, and forming the expandable graphite coating on the inner wall of the battery shell; and assembling the battery cell monomer into the battery shell of which the inner wall is provided with the expandable graphite coating. After the expandable graphite is heated and expanded, the volume is rapidly increased, a battery cell is rapidly wrapped, the battery cell is prevented from being in contact with outside air, and a flame-retardant effect is achieved, so that short-circuit protection in the battery cell is realized.

Description

technical field [0001] The present application relates to the field of lithium-ion battery manufacturing, in particular to a high-safety lithium-ion battery and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries are considered as one of the most important energy storage technologies due to their high energy density and stable cycle performance. However, if not done properly, chemical energy can be released suddenly in the form of combustion or explosion. [0003] Thermal runaway is considered to be the main cause of battery safety problems, and its runaway process can be divided into three stages: [0004] Phase 1, overheating begins. Due to the high ambient temperature of the battery, external short circuit or internal short circuit, and battery overcharging, the battery may overheat. When the internal temperature of the battery begins to rise, stage 1 ends and stage 2 begins. Phase 2, heat accumulation and gas release process. As Phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/34H01M10/0525H01M10/058C09D201/00C09D5/18
CPCC08K2003/323C08L2201/02C09D5/185C09D201/00H01M10/0525H01M10/058H01M50/116H01M50/1243H01M50/581C08K5/053C08K3/32C08K5/34922Y02E60/10Y02P70/50
Inventor 范佳臻吴月田秀君李敏陈淑青唐元鑫
Owner 湖南领湃科技股份有限公司
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