Anti-floating charge protection circuit for spaceflight lithium battery

A technology for protecting circuits and lithium batteries, applied in battery circuit devices, safety/protection circuits, circuit devices, etc., can solve problems such as unusable, high cost, complicated process, etc., achieve simple and reliable circuits, avoid floating charging, and improve life Effect

Pending Publication Date: 2021-06-15
SHANGHAI INST OF SPACE POWER SOURCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires the power supply to control the lower computer to perform calculations, the process is complicated, and once there are problems with sampling

Method used

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  • Anti-floating charge protection circuit for spaceflight lithium battery
  • Anti-floating charge protection circuit for spaceflight lithium battery

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[0025] The anti-floating charge protection circuit for aerospace lithium batteries proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that the simplified circuit forms are used in the drawings to illustrate the working principle and the embodiment of the present invention.

[0026] The invention proposes a new anti-floating protection circuit for lithium batteries used in aerospace, which does not need to send charging termination and unlocking instructions through an additional power supply control lower computer, and is only composed of simple discrete components, with simple circuits and high practicability , to realize the function of automatically terminating charging and resuming charging of the lithium battery, avoiding the floating charge of the li...

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Abstract

The invention relates to an anti-floating charge protection circuit for a spaceflight lithium battery. The anti-floating charge protection circuit comprises a main power charging circuit, a charging termination circuit, a charging unlocking circuit and an execution circuit. In a spaceflight power supply system, a lithium battery is charged by adopting a mode of first constant current and then constant voltage, when a storage battery is converted from constant current charging to constant voltage charging, the battery voltage is gradually increased, the charging current is gradually reduced but does not reach zero, when the charging current is less than a charging termination current threshold value, a charging allowing signal in an execution circuit is turned into a low level, a charging switch tube is turned off, charging is stopped at the moment, and the charging current is zero; when the lithium battery is discharged and the voltage of the battery is lower than the unlocking voltage, the charging allowing signal is turned into a high level, the charging is unlocked, and the PWM signal drives the charging switch tube to charge the battery. According to the invention, the charging and discharging management of the lithium battery can be carried out without additionally controlling a lower computer, the functions of automatically stopping charging and recovering charge of the lithium battery can be realized, the floating charging of the lithium battery can be avoided, and the service life of the lithium battery can be prolonged.

Description

technical field [0001] The invention relates to the field of charging lithium-ion batteries, in particular to an anti-floating charge protection circuit for lithium batteries used in aerospace. Background technique [0002] The aerospace power supply receives the energy of the solar cell array during the light period, and receives the energy of the battery pack during the shadow period, provides stable working power for the whole star, and charges and maintains the battery. Lithium-ion batteries have the advantages of high single output voltage, long cycle life, large specific energy, and small size, and have been widely used in contemporary aerospace power systems. [0003] In order to prolong the service life and charging efficiency of lithium-ion batteries, lithium-ion batteries generally adopt the charging method of charging current termination and voltage unlocking, that is, when the battery is about to be fully charged, the charging current gradually decreases and the ...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0029H02J7/00714H02J7/007182
Inventor 陈乃铭李强张东杰杨进梁一林郭菲寇韵陈鑫玉李淼杨帆赵文柴万腾徐军程新杨华许祺峰
Owner SHANGHAI INST OF SPACE POWER SOURCES
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