Hybrid battery of lead-acid battery and lithium iron phosphate battery with self-regulating function

Abstract

The invention provides a self-regulating hybrid battery of lead-acid batteries and LiFePO4 batteries, which comprises at least one group of lead-acid batteries and at least one group of LiFePO4 batteries, wherein the lead-acid batteries and the LiFePO4 batteries are connected in parallel; the open-circuit voltages of the batteries connected in parallel are the same approximately; the hybrid battery formed by connecting the lead-acid batteries and the LiFePO4 batteries in parallel can automatically adjust charging currents of the two battery branches to make the voltages of two branch batteries always the same; and the LiFePO4 batteries preferentially provide high-power discharging. The hybrid battery formed by connecting the lead-acid batteries and the LiFePO4 batteries in parallel can automatically adjust charging currents of the two battery branches to make the voltages of two branch batteries always the same and charges the lead-acid batteries preferentially. The hybrid battery realizes charging and discharging for the lead-acid batteries and the LiFePO4 batteries connected in parallel and protects the lead-acid batteries at the same voltage by automatically adjusting the self current under the condition of not adding any machine and electronic control circuit, so the cost is reduced and the service life of the lead-acid batteries and the LiFePO4 batteries is prolonged.

Description

【Technical field】 [0001] The present invention relates to a secondary battery, in particular to a method for making the advantages of lead-acid storage battery and lithium iron phosphate battery complementary, without any electronic circuit to control the branches of the hybrid battery, and the hybrid battery itself can automatically adjust the current, so that each branch A hybrid battery of lead-acid battery and lithium iron phosphate battery with self-regulating function with consistent circuit voltage. 【Background technique】 [0002] As we all know, lead-acid batteries and lithium iron phosphate batteries are secondary batteries belonging to different chemical systems, and each has its own unique characteristics. A simple comparison of lead-acid batteries and lithium iron phosphate batteries is shown in Table 1: [0003] Table 1 [0004] Lead-acid batteries Lithium iron phosphate battery Rated voltage (V) 12V 12V Open circuit ...

AI Technical Summary

Problems solved by technology

[0009] 2. The cycle life is short. As a battery for electric vehicles, it needs to be replaced after about one year of use

[0010] 3. When under-charging, it is easy to cause sulfation of the plate, which will seriously shorten the battery life

Such as lead-acid batteries used in electric vehicles, wind energy and solar energy, because the batteries are often not fully charged in time, the batteries are recycled in a partially charged state, which causes sulfation of the plates, resulting in capacity attenuation and shortened life.

[0011] 4. Not suitable for high current discharge

[0026] 3. The above literature does not involve how to select appropriate and different types of secondary batteries to form hybrid batteries that are more reasonable according to their respective characteristics and do not use battery management components for charge / discharge management.

[0027] Although the U.S. patent application US 00593983A involves reasonable performance supplements based on the characteristics of capacity-type lead-acid batteries and power-type lead-acid batteries, the defect of this parallel connection method is that the voltage of the two parallel batteries is the same. The voltage of the type battery drops rapidly, while the capacity of the capacity type battery lags behind the capacity of the power type battery at this time, and it can only be charged when the voltage of the power type battery is lower than that of the capacity type battery after the discharge of the power type battery is completed.

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