Battery circuit and control method thereof

Abstract

The invention provides a battery circuit and a control method thereof, in the battery circuit, a battery pack is used for discharging or charging by using motor feedback current; the other end of the first switch assembly is connected with the motor; the diode assembly is connected in parallel with the first switch assembly, and the conduction direction is consistent with the battery pack discharge direction; the heating circuit is used for connecting motors in parallel and comprises a second switch assembly and a heating device which are connected in series; the heating device is close to the battery pack; the controller is used for controlling the first switch assembly to be switched off and the second switch assembly to be switched on when the battery pack is kept in a motor power supply state if the temperature of the battery pack is judged to be lower than a set threshold value under the condition that the battery and the motor can be bidirectionally electrified, so as to prevent feedback current from flowing through the heating device; when the battery pack temperature exceeds the set temperature, the first switch assembly is controlled to be closed to feed back current to the battery pack. According to the scheme, the problem of low-temperature recharging caused by replacing a lead-acid battery with a lithium battery can be solved.

Description

Technical field [0001] Technical Field The present invention relates to a power supply, in particular, it relates to a battery circuit and a control method. Background technique [0002] The current lead-acid batteries in all walks of life have been widely used, but lead-acid battery discharge is poor, a large discharge voltage drop, and low energy density of lead-acid batteries, very heavy, can not do small, lighter; at the same time short lead-acid battery life. Compared with the lead-acid battery, a lithium battery having a high energy density, long life, small size, light weight, etc., with the continuous decrease of the price of lithium batteries, especially lithium iron phosphate significantly reduce the cost price is even lower than trends lead-acid battery, a lithium ion battery may provide replace lead-acid batteries. [0003] Lead-acid batteries as an energy source of the motor driving the art, such as: electric bicycles, low-speed vehicles, forklifts, etc., in these ar...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a battery circuit and a control method thereof to solve the problem that when a lithium battery is used instead of a lead-acid battery to be used in the field of driving a motor with a lead-acid battery as an energy source, since the feedback current shutdown function is not provided, the motor feedback Charging the battery at a low temperature will cause the lithium battery to decompose lithium

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