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A heating control circuit for lithium-ion batteries

A technology for heating control circuits and lithium-ion batteries, applied to circuits, secondary batteries, electrical components, etc., can solve the problems of battery scrapping, unstable charging power, and insufficient flexibility of heating power, and achieve low power consumption and simple structure Effect

Active Publication Date: 2019-05-14
华富(江苏)锂电新技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. The heating circuit itself consumes current, which may discharge the battery during long-term storage, causing the battery to be scrapped
[0007] 3. The heating power is not flexible enough. Sometimes the heating power will exceed the charging power. Especially in the field of photovoltaic energy storage, the charging power is unstable, which may cause the battery to fail to charge enough power in winter.

Method used

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  • A heating control circuit for lithium-ion batteries
  • A heating control circuit for lithium-ion batteries
  • A heating control circuit for lithium-ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: as figure 2 As shown, VCC is the circuit power supply, R1, R2, NTC, and R3 form a temperature acquisition circuit, and the detection resistor R0 divides the voltage from VCC to obtain a reference voltage for detecting the current signal, and the resistance of the detection resistor R0 is 3kΩ . In the case of battery discharge state or charging current is very small, no circuit heating is required. When the temperature is lower than the set value, the pin 1 of the voltage comparator outputs a high voltage signal; if there is a large enough charging current at this time, the pin 7 of the voltage comparator will output a high level, so that the N-channel The MOS tube Q2 is turned on to turn on the heater. The power supply of the heating control circuit is provided by the single-cell lithium battery itself, and within the protection range of the protection board, the battery will not fail due to over-discharge.

Embodiment 2

[0024] Embodiment 2: as image 3 As shown, the upper part is a traditional 4-string lithium ion protection circuit, and the lower part is the circuit part of the present invention. Lithium battery protection is realized by turning off two MOS tubes in reverse series, one of which is responsible for discharging The current is turned off, and the other is responsible for the charging current to be turned off. The MOS needs a constant voltage to drive and maintain the on state. In order to further reduce power consumption, a low-power LDO device is added to provide low-voltage power supply to the heating control circuit, where VCC is the stable voltage generated by the linear regulator. The entire circuit only increases power consumption by about 50uA, and in In the state of battery discharge protection, the heating control circuit will lose power and stop working. The heating circuit is included in the protection range of the protection board, which can effectively prevent the ...

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Abstract

The invention discloses a heating control circuit used for a lithium ion battery. The heating control circuit comprises a power supply, a voltage comparator, a temperature acquisition circuit, a low-pass RC filter circuit, a P-channel MOS transistor, an N-channel MOS transistor, a detection resistor R0 and a heater, wherein the power supply is used for supplying power for the temperature acquisition circuit and the voltage comparator separately; the output signal of the temperature acquisition circuit is input to the input port of the voltage comparator; the detection signal passing through the detection resistor passes through the low-pass RC filter circuit and is input to the input port of the voltage comparator; the output signal of the voltage comparator controls the P-channel MOS transistor to work; the output signal of the P-channel MOS transistor controls the N-channel MOS transistor to work; and the output signal of the N-channel MOS transistor controls the heater to work. The heating control circuit used is specially used for charging and heating chemical batteries; the heating control circuit has the advantages of simple structure, stability, reliability and low power consumption; and the heating control circuit can work independently without requiring a BMS system or a protection plate.

Description

technical field [0001] The invention relates to a heating control circuit, in particular to a heating control circuit for a lithium ion battery. Background technique [0002] Lithium-ion battery is a kind of chemical power source, which is subject to the law of thermodynamics and is extremely sensitive to temperature. In an ultra-low temperature environment, the specific energy of the battery will drop sharply, and the effective working voltage will also drop, which seriously affects the use. Especially when lithium-ion batteries are charged at low temperatures, it is easy to cause lithium precipitation in the graphite of the negative electrode, and the precipitated metal lithium reacts with the electrolyte, destroying the SEI film of graphite, resulting in irreversible attenuation of battery capacity, exhaust, and internal resistance. Increased and other adverse consequences. In severe cases, it will cause a local short circuit, or even pierce the diaphragm, and directly sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/615H01M10/635H01M10/657
CPCY02E60/10
Inventor 沙树勇吴战宇孙庆周寿斌彭创毛旭辉汪的华闫煜
Owner 华富(江苏)锂电新技术有限公司