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Lithium ion power battery charging method capable of controlling battery degradation based on temperatures

A charging method and power battery technology, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problems of not considering the influence of temperature on battery charging characteristics, affecting battery life, accelerating side reactions, etc. Achieve the effect of improving service life, reducing battery attenuation, and controlling attenuation

Active Publication Date: 2016-06-22
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional lithium-ion battery charging method usually uses constant current and constant voltage charging, but does not consider the influence of temperature on battery charging characteristics
This will cause the battery to still be charged with a fixed current and voltage under high and low temperature conditions, causing the battery to produce lithium during low-temperature charging, and high-temperature charging to accelerate side reactions in the high SOC area, which directly affects battery life.

Method used

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  • Lithium ion power battery charging method capable of controlling battery degradation based on temperatures
  • Lithium ion power battery charging method capable of controlling battery degradation based on temperatures
  • Lithium ion power battery charging method capable of controlling battery degradation based on temperatures

Examples

Experimental program
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Effect test

Embodiment

[0035] The embodiment uses the battery q of 50Ah battery, starting temperature T and V 临界 The relationship between them is (Table 1):

[0036] q (unit is %)

[0037] V within Table 1 above 临界 Values ​​are V at the temperature in brackets 临界 , where V at -20°C 临界 Specifies the theoretical charging upper limit voltage for the battery, V at -15 and 10°C 临界 It is the lithium analysis voltage; when the battery is charged to 4.2V with a standard current constant current at -20°C, q=9.7%. At this time, the charging capacity is low, and the battery has not reached the lithium analysis voltage. From the table above, the T of the battery 1 -20°C, T 2 is 0°C.

Embodiment 1

[0041] Example 1: T=-15°C, T 1 2

[0042] Measure the initial temperature of the battery at -15°C, V 临界 is 4.07V. The battery is charged with a constant voltage pulse from -15°C. As the charge progresses, the battery temperature rises to Tc>T 2 When the temperature is set at 2°C (>0°C), stop the constant voltage pulse charging; at this time, charge with a constant current of 1 / 3C to 4.107V (2°C), then switch to a constant voltage of 4.107V to charge until the current is about 1 / 3C 30C or constant pressure time 1h. Among them, the pulse charging adopts a 4-step pulse process, and the pulse voltages are 4.07V (-15°C), 4.08V (-10°C), 4.09V (-5°C), and 4.10V (0°C), and the pulse voltages are respectively in brackets V at internal temperature 临界 . The temperature intervals were 5°C (heated to 0°C) and 2°C (heated to the target 2°C), the single pulse time was 0.2s, and the rest time after a single pulse was 0.2s.

[0043] The constant voltage pulse charging parameters are sho...

Embodiment 2

[0049] Example 2: T=10°C, T>T 2

[0050] Battery test temperature 10°C, V 临界 is 4.13V. The charging method of the battery at 10°C adopts 1C constant current charging to 4.13V (V 临界 ) and then switch to constant voltage (4.13V) to charge until the current drops to 0.1C or the constant voltage time is 1h.

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Abstract

The invention aims to provide a lithium ion power battery charging method capable of controlling battery degradation based on temperatures. According to the method, the relationship between the proportion of the capacity of the battery which is charged to a V<criticality> state by the standard current to the battery rated capacity and the charging initial temperature is recorded; the dividing point of the battery charging temperature is determined; the temperature ranges are divided based on the dividing point; and different charging parameters are adopted for charging within the respective temperature ranges. The method takes full consideration on temperature influences on the battery charging effect; the generation of charging secondary reaction caused by a condition that a single charging mode is adopted within the whole temperature range is avoided; and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of battery charging, in particular to a lithium-ion power battery charging method in which the charging method is selected based on temperature to control battery attenuation. Background technique [0002] Due to the advantages in energy and power density, lithium-ion batteries have become the main type of batteries used in new energy vehicles, and electric vehicles have put forward higher requirements for battery life. How to improve battery life has become a top priority for lithium battery workers. [0003] There are many factors that affect the life of lithium-ion batteries. In addition to improving battery life through battery design and manufacturing processes, the control of actual process parameters has become a key part of further improving battery life. The charging method as a controllable step is also particularly important. [0004] The traditional lithium-ion battery charging method usually ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCY02E60/10
Inventor 吴宁宁徐金龙李群孙雯石强
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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