A ternary lithium battery car emergency start power supply

Abstract

The invention provides a ternary lithium battery vehicle emergency starting power source. The objective of the invention is to solve the technical problem of incapability of utilizing ternary lithium batteries to make a vehicle emergency starting power source in the prior art. The ternary lithium battery vehicle emergency starting power source includes a three-ternary lithium battery pack module, a four-ternary lithium battery pack module, a load end connector, a unidirectional self-recovery fuse module which comprises a plurality of parallel-connected unidirectional self-recovery fuses each of which includes a diode and a PTC thermistor which are in series connection, a constant current and constant voltage module which is connected with the four-ternary lithium battery pack module, a discharging relay and a discharging management module, wherein the discharging management module includes a single-chip microcomputer and a discharging switch, the discharging management module is connected with and controls the constant current and constant voltage module and the discharging relay, and the PTC thermistor thermally contacts with the diode. With the ternary lithium battery vehicle emergency starting power source of the technical scheme of the invention adopted, technical problems of high-voltage reverse charging, overcurrent discharging and overheating of ternary lithium batteries can be solved.

Description

technical field [0001] The invention relates to a power lithium battery, in particular to an emergency starting power supply for automobiles. Background technique [0002] The car emergency starter is used to start the car under extreme conditions, such as low temperature starting. Provide high current in a short time to start the car. Under extreme conditions, the instantaneous locked-rotor current can reach more than 1500A, which is a typical short-time high-current discharge situation. [0003] Most of the automotive jump-starter products on the market are made of lead-acid batteries for many years. Lead-acid batteries may cause serious environmental pollution in the process of manufacture, use, and recycling; and the emergency starting power supply is a non-useful device used in a low-temperature environment, and the idle time is long. The lead in lead-acid batteries is prone to oxidation, causing the battery to malfunction. In the prior art, there is an emergency st...

AI Technical Summary

Problems solved by technology

In the three-series ternary lithium battery pack, the middle and late voltage of a single battery in a high-rate discharge will be less than 7.8V / 3=2.6V, and the stored electric energy of the battery will not be able to discharge effectively

Therefore, it is difficult to meet the requirements of 12V automotive applications whether it is a three-string or four-string ternary lithium battery pack.

In addition, the characteristic of ternary lithium batteries is that they are prone to overheating during overvoltage charging and high current discharge. Compared with traditional lead-acid batteries, ternary lithium batteries are smaller in size and have smaller heat capacity, so they are more prone to high-temperature accidents. Cause fire, causing property and personal damage

[0005] To overcome the above technical problems and achieve the technical goal of using ternary lithium batteries to make emergency start-up power supplies for automobiles, it is a technical problem that technicians in this field have been expected to solve but have not been able to succeed.

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