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Method for Improving Low-temperature Starting Performance of Batteries

A start-up performance and battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low voltage and discharge capacity, poor performance, etc., to improve mass specific energy, uniform heat production, and mechanical processing performance Good results

Active Publication Date: 2017-09-26
哈尔滨天宝石墨科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention aims to solve the problems of low voltage and discharge capacity and poor performance of the existing battery during low-temperature start-up, and provides a method for improving the low-temperature start-up performance of the battery

Method used

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  • Method for Improving Low-temperature Starting Performance of Batteries

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specific Embodiment approach 1

[0024] Specific Embodiment 1: The method for improving the low-temperature start-up performance of the battery in this embodiment is characterized in that the method is specifically:

[0025] For lithium-ion batteries that use metal foil as the current collector, use flexible graphite paper instead of metal foil as the current collector, connect the external power supply directly to the tabs of the graphite paper current collector, and control the heating voltage range from 1 to 220V. The flexible graphite The thickness of the paper is 0.01 to 1.0 mm.

[0026] In the battery system, ultra-thin flexible graphite paper is introduced as the current collector of the electrode. By applying a voltage to it, the electrode material and electrolyte can be heated uniformly and rapidly from the inside of the cell, thereby rapidly increasing the temperature of the battery, making the battery even in the Storage in a low temperature environment can still maintain high charge and discharge ...

specific Embodiment approach 2

[0027] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the flexible graphite paper replaces all or part of the Al foil as the current collector of the positive electrode of the lithium-ion battery. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the flexible graphite paper replaces all or part of the Cu foil as the current collector of the negative electrode of the lithium-ion battery. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for improving battery low-temperature starting performance, and relates to the method for improving the battery starting performance in a low temperature environment. The invention aims to solve problems that a conventional battery has low voltage and discharge capacity and poor use performance during low-temperature starting. Under conditions without changing a battery material and an electrolyte solution and without significantly changing an internal structure and preparation processes, flexible graphite paper entirely or partly replaces a metal to be used as an electrode current collector, or the graphite paper is directly placed between a positive electrode and a negative electrode to be used as an electrical heating element, an external-connection power source is applied to the graphite paper to make the graphite paper rapidly heated, so that the electrode material and the electrolyte solution are rapidly heated, the battery internal temperature rises rapidly, the battery discharge voltage and the battery discharge capacity can be close to room temperature values in a short period of time, and the problem of substantial attenuation of the performance during the battery low-temperature starting is effectively solved. The method is used in the field of secondary batteries.

Description

technical field [0001] The invention relates to a method for improving the low-temperature starting performance of a battery. Background technique [0002] At present, there is a common problem in all kinds of secondary batteries, that is, their performance in low temperature environment is significantly worse than that in normal temperature. Under the environment, the battery capacity cannot be effectively utilized, and the design and use requirements cannot be met. For example, the discharge capacity of lithium-ion batteries at -40°C is only about 50% of the room temperature capacity, and basically cannot be started at -50°C; the temperature of lead-acid batteries does not drop by 1 degree, and the capacity decays by about 1%. The poor low-temperature performance of batteries severely restricts the popularization and use of electric vehicles, electric buses, and electric bicycles in northern cold regions, making it difficult for traditional fuel vehicles to start, and it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/615H01M10/625H01M10/654H01M10/6571H01M10/0525
CPCH01M4/663H01M10/0525Y02E60/10
Inventor 邢涛曹殿学
Owner 哈尔滨天宝石墨科技发展有限公司
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