An on-orbit maintenance circuit for lithium-ion batteries

Abstract

A maintenance circuit for lithium ion batteries in an on-orbit storage period comprises capacity adjusting main circuits, capacity protection circuits and control enable circuits, wherein the number of the capacity adjusting main circuits is consistent with that of the configured lithium ion batteries, each capacity adjusting main circuit comprises a magnetic latching relay J7, MOS (metal oxide semiconductor) transistors Q1-Q4, triodes Q5 and Q6, diodes D10 and D11, resistors R20-R28 and a power supply VCC41. The number of the capacity protection circuits is consistent with that of the capacity adjusting main circuits, each capacity protection circuit consists of a capacity detection sub-path and a protection enable sub-path and comprises operational amplifiers U41 and U42, a triode Q18, resistors R19, R31-R40, a magnetic latching relay J9 and power supplies VCC43 and VCC44; the number of the control enable circuits is consistent with that of the capacity adjusting main circuits, each control enable circuit comprises a magnetic latching relay J8, a power supply VCC42 and resistors R29 and R30. The main circuits and the lithium ion batteries are connected in parallel, and the implementation mode is simple; an automatic adjusting function is set, the capacity maintenance means is diversified, and the maintenance circuit has high reliability.

Description

technical field [0001] The invention relates to an on-orbit long-term storage period performance maintenance circuit for lithium-ion accumulators. Background technique [0002] Energy storage power supplies for near-Earth spacecraft mainly include nickel-cadmium lithium-ion batteries, nickel-hydrogen lithium-ion batteries, and lithium-ion batteries. Compared with other energy storage power supplies, lithium-ion batteries have the advantages of high specific energy, high specific power, and easy modular design. , is the first choice for the energy storage power supply of the current near-Earth spacecraft. At present, the monthly self-discharge rate generally accepted by lithium-ion batteries is 2%. Once the lithium-ion batteries are put on hold for a long time, the electrical performance will decrease abnormally, including the irreversible capacity attenuation and internal resistance increase caused by the consumption reaction of the internal chemical system of the battery. ...

AI Technical Summary

Problems solved by technology

[0004] According to literature research, there are few researches on the performance maintenance methods of lithium-ion batteries during long-term storage in orbit at home and abroad. Lithium-ion battery capacity design margin to ensure the battery capacity at the end of life, the second is to realize the adjustment of lithium-ion battery capacity through the forced balance function of the balance manager, the above method has the following limitations in practical engineering applications: 1. The first method brings power The system energy storage power margin is too large, resulting in waste of satellite resources and increasing development costs. 2. Method 2 is only applicable to the power system using the balance manager and the lower computer, and the balance manager is equipped with a forced shunt function, which is not applicable The balance manager with forced shunt function is also not suitable for power systems that use commercial off-the-shelf batteries that do not require balance management and lower-level computer functions. 3. Method 2 As the voltage of lithium-ion batteries increases, the balance manager will The heat consumption of the work is greatly increased in proportion, and the thermal design and heat dissipation requirements of the stand-alone equipment are very high, which is not conducive to the optimal design of the thermal control of the whole star

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