Battery pack and system of battery pack

Abstract

The embodiment of the invention discloses a battery pack, which comprises a plurality of small battery packs, a charging circuit, a discharging circuit and a control circuit, wherein each small battery pack is formed by sequentially and serially connecting a plurality of batteries, and the small battery packs are connected in parallel; a positive electrode of the charging circuit is electrically connected with a positive electrode of each small battery pack, and a negative electrode of the charging circuit is electrically connected with a negative electrode of each small battery pack; a positive electrode of the discharging circuit is electrically connected with the positive electrode of each small battery pack, and a negative electrode of the discharging circuit is electrically connected with the negative electrode of each small battery pack; the control circuit comprises a charging control circuit and a discharging control circuit, the charging control circuit is electrically connected with the charging circuit, and the discharging control circuit is electrically connected with the discharging circuit. The embodiment of the invention also discloses a battery pack system. When the battery pack and the battery pack system are adopted, the safety performance during the battery pack operation can be improved, and the service life of the battery pack can be prolonged.

Description

technical field [0001] The invention relates to the field of energy, in particular to a battery pack and a system thereof. Background technique [0002] The "Administrative Rules for the Access of New Energy Vehicle Manufacturers and Products" has been officially implemented on July 1, 2009, which emphasizes that: New energy vehicles refer to the use of unconventional vehicle fuels as power sources (or the use of conventional vehicle fuels). Fuel, the use of new vehicle-mounted power units), integrated advanced technology in vehicle power control and drive, the formation of advanced technical principles, with new technology, new structure of the car. [0003] In the prior art, the power of the new energy vehicle is mainly provided by the battery pack. Most battery pack solutions adopt the method of paralleling first and then series. Although this method can make the cost of the protection circuit and balancing circuit of the battery pack lower, However, the safety performan...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the power of new energy vehicles is mainly provided by battery packs. Most of the battery pack schemes use the method of paralleling first and then series. Although this method can make the cost of the protection circuit and equalization circuit of the battery pack lower, However, the safety performance is poor. If there is a battery with poor performance in the parallel battery pack, the performance of the entire battery pack will deteriorate. If one battery in the battery pack is broken, other batteries will form a reverse charge for it. state, and the broken battery itself is not fully charged, so the temperature of the broken battery will inevitably rise or even explode, which will have a bad impact on other batteries

Therefore, the safety performance of the whole battery pack is poor and the service life is short

Secondly, in terms of cost, power battery packs that are connected in parallel first and then connected in series generally can only play 75% to 80% of the total capacity, and need to provide more power, which can only increase the number of batteries, which increases the cost instead.

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