Lithium ion power low temperature cell

A power battery and lithium-ion technology, which is applied in the field of lithium-ion power low-temperature batteries, can solve problems such as inability to discharge, short discharge time, and affecting the use of electrical appliances, and achieve stable product performance, high-power discharge, and good safety.

Active Publication Date: 2009-12-30

湖北中聚能源有限公司

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AI-Extracted Technical Summary

Problems solved by technology

Conventional products can basically satisfy the discharge in the environment of -20-60°C, but when discharged at a temperature lower than ...

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Method used

In electrolytic solution: electrolytic solution adopts the organic mixed solution of the lithium salt of 1mol/L, and lithium salt adopts lithium hexafluorophosphate, and organic solvent is ethylene carbonate fat, propylene carbonate fat, ethyl methyl carbonate is formulated, ethylene carbonate fat: carbonic acid The volume ratio of acrylic resin: ethyl methyl carbonate is 1:1:1. It not only ensures the conductivity of the electrolyte, the battery can be discharged ...

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Abstract

A lithium ion power low temperature cell comprises a tab (1), an anode plate (2), a cathode plate (4), a diaphragm (3), electrolyte (6) and an aluminum plastic die (5), and the invention adopts special proportioning and structure in the anode plate, the cathode plate and the electrolyte. The lithium ion power low temperature cell of the invention overcomes the defects that conventional products only can discharge under the environment of minus 20 DEG C to 60 DEG C, and has short discharging time or incapability of discharging under the condition of below minus 20 DEG C; the invention features stable performance, high energy of volume ratio, good safety and can satisfy high power discharging; the low temperature environment can satisfy normal work under the condition of minus 40 DEG C, and can discharge more than or equal to 70% of initial volume.

Application Domain

Final product manufactureSecondary cells

Technology Topic

PhysicsHigh energy +4

Image

Examples

Experimental program(1)

Example Embodiment

[0014] The following describes the implementation of the present invention in detail with reference to the accompanying drawings, but they do not constitute a limitation to the present invention, and are merely examples. At the same time, the advantages of the present invention will become clearer and easier to understand.

[0015] Referring to the attached drawings, it can be seen that the lithium-ion low-temperature power battery of the present invention includes tabs 1, positive electrode sheet 2, negative electrode sheet 4, separator 3, electrolyte 6, aluminum plastic film 5.

[0016] In the positive electrode sheet: the thickness of the positive electrode sheet is 80-130um, the positive electrode active material is lithium manganate or lithium iron phosphate, the binder is polyvinylidene fluoride; the conductive agent is acetylene black; the positive electrode active material: binder: conductive agent The weight percentage is 80-90%: 5-10%: 5-10%; pole pieces made according to the ratio can reduce the distance of ion conduction in the solid phase and increase the conductivity, thereby ensuring the low-temperature discharge performance and large current of the battery Discharge performance;

[0017] In the negative electrode sheet: the thickness of the negative electrode sheet is 50-100um, the negative electrode active material is artificial graphite, the binder is acrylate glue; the conductive agent is acetylene black; the weight percentage of the negative electrode active material: binder: conductive agent is 90- 95%: 1-5%: 1-5%; pole pieces made according to the ratio can reduce the ion conduction distance in the solid phase and increase the conductivity, thereby ensuring the battery's low-temperature discharge performance and high-current discharge performance;

[0018] In the electrolyte: the electrolyte is an organic mixed solution of 1mol/L lithium salt, the lithium salt is lithium hexafluorophosphate, and the organic solvent is ethylene carbonate, propylene carbonate, and methyl ethyl carbonate. Ethylene carbonate: propylene carbonate: The volume ratio of methyl ethyl carbonate is 1:1:1. It not only guarantees the conductivity of the electrolyte, the battery can be discharged at a large current; but also ensures that the battery can work under ultra-low temperature; the safety meets the requirements of the national standard.

[0019] The battery adopts a multi-core multi-pole structure (such as figure 2 , image 3 Shown). It not only reduces the internal resistance of the battery, but also enhances the heat dissipation function of the tabs, which can ensure the high current and ultra-low temperature discharge of the battery.

[0020] In the present invention, the positive and negative plates are made by a conventional manufacturing process; the electrolyte adopts a high-conductivity low-temperature electrolyte, which is realized by a series-parallel assembly method. The other unspecified parts are all prior art.

[0021] Tested by experiments: the lithium-ion low-temperature power battery product of the present invention has stable performance, high volumetric specific energy, and good safety. The normal temperature environment can meet the high-power discharge; the low-temperature environment can meet the temperature of -40°C and can also work normally. Can release ≥70% of the initial capacity (such as figure 1 As shown, in the figure, a represents the existing battery discharge curve, and b represents the battery discharge curve of the present invention).

[0022] It should be noted that for those skilled in the art, several changes or modifications can be made to the present invention without changing the principle of the present invention, which also belongs to the protection scope of the present invention.

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PUM

Property	Measurement	Unit
Thickness	80.0 ~ 130.0	µm
Thickness	50.0 ~ 100.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Product performance is stable
Increase volume specific energy

Lithium ion power low temperature cell

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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