Battery capacity detection device and battery device

Abstract

The invention provides a battery capacity detection device applied to a battery set. The battery set consists of a plurality of batteries, wherein the plurality of parallel connected batteries form parallel battery sets, and the plurality of parallel connected battery sets are connected in series to form a battery set; and the quantities of the batteries in the plurality of battery sets are the same. The battery capacity detection device comprises a plurality of resistors, a plurality of voltage sensors, a plurality of current sensors and a calculating unit, wherein the plurality of resistors are connected among the plurality of parallel connected batteries to ensure that each resistor with the same resistance value is respectively connected between any two batteries in each parallel connected battery set; the plurality of voltage sensors are used for detecting the voltage values of voltage at two ends of the resistors with the same resistance value; the plurality of current sensors are used for detecting the current values of current flowing into corresponding batteries; and the calculating unit is used for judging the capacity recession condition of the plurality of batteries. The invention also discloses a battery device with a capacity detection function. According to the invention, the capacity of the batteries can be detected in real time so as to replace the batteries and prolong the service life of the battery set; and the device is convenient for being used on an electric vehicle.

Description

technical field [0001] The invention relates to battery technology, in particular to a battery capacity detection device applied to a battery pack and a battery device with a capacity detection function. Background technique [0002] Due to the widespread use of electric vehicles, the demand for batteries used in electric vehicles is also increasing. Due to the high one-time investment cost of the battery of the existing electric vehicle, the short service life of the battery, and the high cost of battery replacement, a new type of battery based on a battery pack has emerged. The battery pack is composed of multiple unit cells connected in parallel and in series. Form a "matrix" form (for example, a battery pack with 4 series and 10 parallel batteries including 40 batteries can be formed by connecting every 10 batteries in parallel, and then connecting 4 sets of parallel batteries in series). The new type of storage battery can solve the shortcomings of the existing storage...

AI Technical Summary

Problems solved by technology

[0003] However, according to the current method, the capacity detection of each unit battery in the storage battery is cumbersome, and the battery management, replacement, and maintenance are still not flexible enough.

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