Voltage sampling device, system and method of battery cell of lithium-ion battery pack
A single battery and voltage sampling technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of different self-discharge currents and inapplicability of single cells, and achieve reduced self-discharge, simple circuits, and simple engineering implementation Effect
Active Publication Date: 2014-12-24
SHANGHAI INST OF SPACE POWER SOURCES
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And the inherent defect of the monomer sampling circuit itself: the self-discharge current of each monomer is different
[0004] This method is obviously not applicable when the working life of the lithium-ion battery pack is only required to be 3 months or even shorter, and the system needs to collect the voltage of each single battery
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[0050] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.
[0051] Such as figure 1 As shown, a voltage sampling device for a single battery of a lithium-ion battery pack includes: a sampling switch K, which uses a relay switch or an electronic switch or other interfaces that can disconnect or close the single battery from the sampling circuit. When the sampling circuit needs to work, the sampling switch K can be turned off to reduce the artificial self-discharge of the lithium-ion battery pack; the equalizing resistance R x , equalizing resistor R x It can be one resistor, or multiple resistors connected in series, parallel or in other forms; a sampling circuit; one end of the sampling switch is connected to the positive pole of the single battery BAT, and the other end of the sampling switch is connected to the positive pole of the single battery BAT, and the other end...
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The invention discloses a voltage sampling device of a battery cell of a lithium-ion battery pack. The device comprises a sampling switch, a balancing resistor and a sampling circuit; one end of the sampling switch is connected with a positive electrode of the battery cell, and while the other end of the sampling switch is connected to a negative electrode of the battery cell through the balancing resistor; the sampling circuit is connected in parallel with the balancing resistor, and the sampling circuit comprises a first equal multiplying voltage division circuit, a second equal multiplying voltage division circuit, a differential amplifying circuit and a voltage stabilizing diode; the input end of the first equal multiplying voltage division circuit is connected to the positive electrode of the battery cell through the sampling switch, and while the output end of the first equal multiplying voltage division circuit is connected to the positive input end of the differential amplifying circuit; the input end of the second equal multiplying voltage division circuit is connected to the negative electrode of the battery cell, and while the output end of the second equal multiplying voltage division circuit is connected to the negative input end of the differential amplifying circuit; the output end of the differential amplifying circuit is connected with a cathode of the voltage stabilizing diode to be used as the output end of the sampling circuit; an anode of the voltage stabilizing diode is grounded. According to the voltage sampling device of the battery cell of the lithium-ion battery pack, the sampling circuit is simple in structure, the sampling voltage precision is high, and the project is easily carried out.
Description
[0001] technical field [0002] The invention relates to the technical field of management of lithium-ion battery packs, and in particular relates to a voltage sampling device, system and method for a single cell of a lithium-ion battery pack. Background technique [0003] Due to its high specific energy, high operating voltage, and environmental friendliness, lithium-ion battery packs are widely considered to be the next generation of power ion batteries. And the inherent defect of the monomer sampling circuit itself: the self-discharge current of each monomer is different. The smaller the voltage difference between the individual cells that make up the battery pack, the longer the life of the lithium-ion battery pack. In order to realize the control of the difference between each single battery, generally through the sampling circuit control, information processing unit and balance control, the balance control is carried out on each single battery of the battery pack to e...
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IPC IPC(8): G01R31/36
Inventor 王新征张俊亭郑磊卫芬丁一宁刘绘莹
Owner SHANGHAI INST OF SPACE POWER SOURCES
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