High-voltage single solid-state lithium ion battery and preparation method thereof

A lithium-ion battery and high-voltage technology, which is applied in the preparation of high-voltage single-solid-state lithium-ion batteries and the field of high-voltage single-solid-state lithium-ion batteries, can solve the problems of complex structure and process, difficulty in large-scale industrial production, etc. Avoid heat generation or rate difference, achieve large-scale industrial production, and achieve high specific power

Inactive Publication Date: 2019-12-10
安徽坤宇塑金新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the existing bipolar plate structure lithium-ion battery using electrolyte is complex in structure and process, and is difficult to be suitable for large-scale industrial production, and provides a high-voltage single lithium-ion solid-state battery and a manufacturing method thereof. The energy component uses solid bipolar plate electrodes and adopts an optimized connection method, which can not only overcome the defects caused by the use of liquid electrolyte, but also greatly reduce the internal resistance of the battery and improve the power output capability, which is very suitable for realizing large-scale Industrial production

Method used

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  • High-voltage single solid-state lithium ion battery and preparation method thereof
  • High-voltage single solid-state lithium ion battery and preparation method thereof
  • High-voltage single solid-state lithium ion battery and preparation method thereof

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preparation example Construction

[0045] The embodiment of the present invention also provides the preparation method of the aforementioned high-voltage single lithium-ion solid-state battery, such as Figure 5 shown, including the following steps:

[0046] S1. Prepare metal foil, including the bipolar plate metal foil as the bipolar plate current collector base material, the positive end metal foil as the positive end plate base material, and the negative end metal foil as the negative end plate base material;

[0047] S2. Coating the positive active material slurry on one side of the metal foil at the positive end, coating the negative active material slurry on one side of the metal foil at the negative end, and coating the positive active material slurry on the positive side and the negative side of the metal foil of the bipolar plate respectively material and negative electrode active material slurry, so that the area of ​​the negative electrode active material layer formed by coating is greater than the a...

Embodiment 1

[0061] The bipolar plate current collector, the positive end plate and the negative end plate are all made of copper-aluminum composite metal foil with a thickness of 30 μm. Both the positive end plate and the negative end plate are coated with active materials on both sides. The positive active material layer and the negative active material layer The surface is coated with a solid electrolyte layer; the aluminum foil side is the positive electrode side, the coated positive electrode active material is lithium iron phosphate, the copper foil side is the negative electrode side, the coated negative electrode active material is graphite, and the solid electrolyte layer is LiPON (lithium phosphorus oxynitride). The specific process is as follows:

[0062] On both sides of the copper-aluminum composite metal foil with a width of 150mm, the positive lithium iron phosphate and the negative graphite are respectively coated. The coating process is the same as the extrusion coating pr...

Embodiment 2

[0065] The bipolar plate current collector, the positive end plate and the negative end plate are all made of aluminum foil with a thickness of 30 μm. Both the positive end plate and the negative end plate are coated with active materials on both sides, and only the surface of the positive active material layer is coated with a solid electrolyte layer. ; The coated positive active material is lithium iron phosphate, the coated negative active material is lithium titanate, and the solid electrolyte layer is Li 2 S-P 2 S 5 . The specific process is as follows:

[0066] The positive electrode lithium iron phosphate and the negative electrode lithium titanate are respectively coated on both sides of the aluminum foil with a width of 150mm; the coating width of the positive electrode active material lithium iron phosphate slurry on the positive side of the aluminum foil is 143mm, and the aluminum foil is uniformly left blank at 3.5mm each. mm, at the same time, the longitudinal ...

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Abstract

The invention provides a high-voltage single solid-state lithium ion battery. The lithium ion battery comprises three or more plate-shaped electrodes which are stacked in sequence, wherein the three or more plate-shaped electrodes are sequentially a negative electrode, at least one bipolar plate electrode and a positive electrode from top to bottom, the plate-shaped electrodes are separated by solid electrolyte layers, and the plate-shaped electrodes and the solid electrolyte layers are bonded together in a thermal compounding mode and packaged into a single battery. According to the battery,internal series connection of the single battery is realized, and the problem of difficult packaging or complex packaging structure caused by using a liquid electrolyte is avoided; the single batteryis adjustable in capacity and voltage, high voltage of the single battery can be conveniently realized, and the problems of heating or poor multiplying power and the like when the conventional lithiumion batteries are externally connected in series are avoided; the connection of the energy storage assembly is optimized, and the internal resistance of the battery is reduced; and the production process and equipment are basically the same as those of the existing lithium ion battery, so that large-scale industrial production is facilitated. The invention also provides a preparation method of the high-voltage single solid-state lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries, in particular to a high-voltage single solid-state lithium-ion battery. The invention also provides a preparation method of the high-voltage monomer solid-state lithium ion battery. Background technique [0002] The development of new energy vehicles has promoted the technological progress of lithium-ion power batteries. Batteries with lithium iron phosphate and ternary materials as positive active materials have become the main force. Through the series connection of dozens or even thousands of single batteries or battery modules And in parallel to achieve the high voltage and high capacity requirements of the battery system. The series and parallel connection of single batteries are generally connected by screw fastening the series copper bars. In this process, due to the difference in screw fastening force, the heat generated by the battery system during the charging and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0585
CPCH01M10/0525H01M10/0585H01M2220/20Y02E60/10Y02P70/50
Inventor 徐瑞
Owner 安徽坤宇塑金新能源技术有限公司
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