Automatic equalization charging equipment charged by series storage battery

Abstract

The present invention relates to an automatic balance charging device for charging series storage battery, which is arranged on each battery of the series storage battery one to one. The balance charging device comprises an accurate voltage balance current shunt [1] and a limiting fuse [2] in series. The present invention enables the battery of the series storage battery to obtain balance charging in long term automatically, thereby greatly prolonging the real service life of the storage battery. The present invention is characterized by simple circuit, small volume, low cost and good using effect, thereby being applicable to various series storage battery which can automatically solve the balance charging problem without any measures.

Description

Technical field: [0001] The invention belongs to electric energy storage system. Background technique: [0002] In the prior art, many devices such as automobiles, electric vehicles, ships, submarines, UPS power supplies, electric tools, audio-visual equipment, etc. use series-connected battery packs to store electric energy. Many aspects are different, and it is unavoidable that some batteries will prematurely decline after several times of almost identical charge and discharge cycles, which will cause the battery pack to be scrapped in advance. China ZL (application) 03156376.7, 02124897.4, 02100307.6 and 03118370.0 disclose equalizing charging devices for several active accumulators, but all adopt a switching discharge circuit, a detection circuit, an external single-chip microcomputer or a special The closed-loop control method of the control device is too complicated, has many connection lines, large volume, high cost, and cannot meet the actual needs of small and medi...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, many devices such as automobiles, electric vehicles, ships, submarines, UPS power supplies, electric tools, audio-visual equipment, etc. use series-connected battery packs to store electric energy. Many aspects are different. It is inevitable that some batteries will prematurely decline after multiple charge and discharge cycles that are almost identical, leading to premature scrapping of the battery pack.

China ZL (application) 03156376.7, 02124897.4, 02100307.6 and 03118370.0 disclose equalizing charging devices for several active accumulators, but all adopt a switching discharge circuit, a detection circuit, an external single-chip microcomputer or a special The closed-loop control method of the control device is too complicated, has many connection lines, large volume, high cost, and cannot meet the actual needs of small and medium-sized electrical equipment with small space, wide use, low cost, and convenient integration. ZL03266703.5 discloses a passive battery equalization charging device including a switching discharge circuit connected in parallel with a single battery, a series voltage regulator, a voltage comparator, and a temperature control switch, but there are:

[0003] 1. The static working current is too large, and the stable current of the parallel Zener diode is several mA. If it is integrated with the battery, it will seriously affect the storage life of small and medium-capacity batteries;

[0004] 2. The deviation of the voltage regulation value of the Zener diode is generally 2-5%, and the dynamic internal resistance is generally about 20Ω. Due to the discreteness of the voltage regulation value, the large dynamic internal resistance and the temperature coefficient of the voltage regulation value of the Zener diode is too large , it is difficult to adjust the subjective switching voltage of multiple equalizing charging devices connected in parallel on the same series battery pack within 20mV, and it is even more difficult to meet the standard of equalizing charging voltage of lead-acid battery packs proposed by the post and telecommunications department of less than or equal to 50mV;

[0005] 3. The parallel switch adopts V-MOS transistor, its G pole control voltage needs to be at least 6V, and the high level output by the voltage comparator cannot reach the full rail, so it cannot be used for battery packs composed of batteries below 6V in series, especially It is a battery pack composed of lithium batteries connected in series;

[0006] 4. The parallel switching discharge circuit consumes a lot of power. In order to protect the equalizing charging device, a temperature control switch is connected in series in the main circuit of the battery. In a general sense, the possibility of integrated installation is lost and it becomes a special device. , causing inconvenience to use

[0007] At present, due to the problem of balanced charging, the actual service life of most battery packs is far from reaching the design service life of the battery manufacturer. A large number of batteries are scrapped in advance, which is not economical, but will also cause serious secondary pollution to the environment. The problem needs to be solved.

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