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Method for controlling battery charging by gas sensor

A gas sensor and battery charging technology, which is applied in secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as wasting energy, shortening battery life, and battery overcharging

Inactive Publication Date: 2006-09-13
上海万宏动力能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these several technologies have a serious shortcoming, that is, they will inevitably cause overcharging of the battery (pack).
For example: use the temperature change rate to control the charging termination. When the temperature changes significantly, the battery has already been filled with a lot of gas, which not only wastes energy, but also shortens the life of the battery (pack)
In addition, ambient temperature changes can also interfere with the process of monitoring charging using temperature changes

Method used

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  • Method for controlling battery charging by gas sensor
  • Method for controlling battery charging by gas sensor
  • Method for controlling battery charging by gas sensor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0064] Example 1 A gas pressure sensor is used to detect the internal pressure change of a cylindrical SC-QNY3 nickel metal hydride (MH-Ni) battery 3C during charging.

[0065] image 3 It is a schematic diagram of a cylindrical battery external gas pressure sensor device. Compared with the built-in pressure sensor 1 , the external pressure sensor 11 reflects the internal pressure of the battery under test 2 by detecting the small deformation of the bottom of the battery under test 2 during the charging and discharging process of the battery under test 2 . When the external pressure sensor 11 is used, it is only necessary to connect the part of the battery 2 under test with a larger deformation to the external pressure sensor 11, and the connection method is as follows:

[0066] The pressure strain gauge of the external pressure sensor 11 is fixed to the outside of the bottom of the cylindrical battery under test 2 or the side of the square battery with special glue. The pos...

example 2

[0069] Example 2 The internal oxygen content of the square nickel metal hydride (MH-Ni) battery QNF14 changes at 5A during charging.

[0070] Figure 4 It is a schematic diagram of the gas sensor (pressure or oxygen content) device inside the prismatic battery. Among them, the gas sensor 1 can be tightened and compressed by sealing rings and ribs at the position of the safety valve of the square battery under test 2, and can also be rounded at a position other than the safety valve, and the round mouth also needs to be machined. The thread is so that when the gas sensor 1 is installed, the sealing ring and the thread are tightened to compress the seal. The positive pole 3a and the negative pole 5a of the battery 2 under test are respectively connected to two output terminals of the charging device.

[0071] Image 6 It represents the internal gas change of the square nickel metal hydride (MH-Ni) QNF14 battery during the charging process. When charging for about 170min, the...

example 3

[0072] Example 3 During the 5A charging process of the square nickel-metal hydride (MH-Ni) battery QNF14, the state of charge (SOC) of the battery is estimated from the oxygen content in the internal gas.

[0073] from Figure 7 It can be seen that at 20°C, the oxygen content of the square nickel metal hydride (MH-Ni) QNF14 battery during the charging process has a good correspondence with the charging power, so the state of charge (SOC) of the battery can be judged according to the oxygen content in the battery. ).

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Abstract

This invention relates to a method for controlling charging of storage batteries with gas sensors, which tests oxygen content or gas pressure in the internal gas of the battery with a gas sensor or an outer pressure sensor then uses a differential coefficient method to compute the variety rate of the oxygen or gas pressure to decide its charge state to further determine a charging strategy, which is suitable for Ni-base watercourse batteries.

Description

technical field [0001] The invention relates to a method for controlling storage battery charging by using a gas sensor, relates to the technical field of batteries, and relates to a control method and device for storage battery charging. Background technique [0002] The development of batteries for electric vehicles (EV) and hybrid electric vehicles (HEV) has made people pay more attention to high-energy and high-power battery systems. The requirements for battery charging process control are also getting higher and higher. Charging technology has become a part of battery technology. , especially an integral part of batteries in terms of safety, reliability and long-life cycle performance. For batteries used in electric vehicles (EV) and hybrid electric vehicles (HEV), efficient and fast charging capability and judgment of state of charge (SOC) are an important problem to be solved urgently. [0003] Traditional battery charge control techniques are generally based on pea...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/48
CPCY02E60/12Y02E60/10
Inventor 夏保佳娄豫晥徐乃欣
Owner 上海万宏动力能源有限公司
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