Hybrid energy storage system with low-temperature self-heating function and self-heating method

A hybrid energy storage system and self-heating technology, which is applied in secondary battery repair/maintenance, electrochemical generators, transportation and packaging, etc., can solve the problems of large system volume and weight, and achieve high energy efficiency, low cost, and easy The effect of using

Pending Publication Date: 2022-05-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-frequency charging and discharging of the battery often requires an additional excitation circuit, which makes the entire system larger in size and weight. Therefore, such methods have not been well applied in practical applications at present.

Method used

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  • Hybrid energy storage system with low-temperature self-heating function and self-heating method
  • Hybrid energy storage system with low-temperature self-heating function and self-heating method
  • Hybrid energy storage system with low-temperature self-heating function and self-heating method

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Embodiment 1

[0034] This embodiment discloses a hybrid energy storage system with a low-temperature self-heating function, including a battery and a supercapacitor connected in parallel on the bus, and the battery and the supercapacitor are connected in parallel through a bidirectional DC / DC converter, so that the battery and the supercapacitor They can charge and discharge each other to realize the low-temperature self-heating of the battery. Wherein, the battery is a lithium battery. The lithium battery is used as the energy device of the hybrid energy storage system, and the supercapacitor is used as the power device of the hybrid energy storage system. The bidirectional DC / DC converter can be controlled by pulse width modulation, so that the high Charge and discharge each other frequently to achieve low-temperature self-heating of the battery. It has the characteristics of fast temperature rise and high energy efficiency, and is suitable for the inherent configuration of the hybrid ene...

Embodiment 2

[0039] For the hybrid energy storage system with low-temperature self-heating function in embodiment 1, this embodiment discloses a self-heating method, which can preheat the entire system in the hybrid energy storage system in embodiment 1 in a low-temperature environment, refer to image 3 , after the entire hybrid energy storage system is started, the self-heating method specifically includes the following steps:

[0040] Step 1, when the hybrid energy storage system is started, obtain the actual temperature of the battery, and judge whether the temperature of the battery is lower than the preset temperature, if so, disconnect the bus and heat it, that is, go to step 2; The system works normally;

[0041] Step 2, determine the optimal frequency of battery self-heating AC excitation current based on the real-time temperature of the battery;

[0042] Step 3, control the bidirectional DC / DC converter through pulse width modulation, so that the battery and the supercapacitor ...

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Abstract

The invention discloses a hybrid energy storage system with a low-temperature self-heating function and a self-heating method.The hybrid energy storage system comprises a battery and a super capacitor which are connected to a bus in parallel, and the battery and the super capacitor are connected in parallel through a bidirectional DC / DC converter so that the battery and the super capacitor can be charged and discharged mutually; and completing low-temperature self-heating of the battery. The hybrid energy storage system is applied to the technical field of hybrid energy storage, the battery serves as an energy type device of the hybrid energy storage system, the super capacitor serves as a power type device of the hybrid energy storage system, the bidirectional DC / DC converter can be controlled in a pulse width modulation mode, high-frequency mutual charging and discharging are conducted between the battery and the super capacitor, and low-temperature self-heating of the battery is achieved; the device has the characteristics of high temperature rise rate and high energy efficiency, is suitable for an inherent configuration of a hybrid energy storage system, does not need to be specially integrated with other heating devices or special circuits, and has the advantages of low cost and easiness in use.

Description

technical field [0001] The invention relates to the technical field of hybrid energy storage, in particular to a hybrid energy storage system with a low-temperature self-heating function and a self-heating method. Background technique [0002] Researching energy storage devices or energy storage systems with high power density and high energy density characteristics is an eternal theme in the development of energy storage technology. At present, since it is difficult to meet the requirements of high energy density and high power density for some special electrical equipment at the same time by using a single energy storage device, the hybrid energy storage system that integrates energy-type energy storage devices and power-type energy storage devices is used in some It has great application value and prospects in specific scenarios. [0003] At present, research on hybrid energy storage systems is mainly focused on energy management and real-time power distribution of hybri...

Claims

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Application Information

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IPC IPC(8): H02J7/34H01M10/44H01M10/615
CPCH02J7/345H01M10/443H01M10/615H02J2207/20
Inventor周星张涛刘亚杰黄生俊黄旭程刘天宇宋元明
OwnerNAT UNIV OF DEFENSE TECH