Battery forming and capacity grading system

Abstract

The invention discloses a battery forming and capacity grading system. The system comprises linear charge and discharge units capable of realizing bidirectional energy transmission, DC-DC units and a DC-AC unit, wherein batteries are connected with a grid through the linear charge and discharge units, low-voltage DC buses, the DC-DC units, high-voltage buses and the DC-AC unit sequentially; when the batteries are charged and discharged, energy can be recycled on the low-voltage DC buses and the high-voltage DC buses; discharged battery energy can be supplied to rechargeable batteries or fed back to be released to the grid. The system has the characteristics as follows: 1, the battery discharge energy is recycled, so that the system is energy-saving and efficient; 2, the heat produced by the system is low, so that heat dissipation equipment and power distribution equipment can be reduced; 3, the maintenance cost is low; 4, the battery capacities are accurately calculated; 5, the system is high in cost performance for small-capacity batteries.

Description

technical field [0001] The invention belongs to the field of battery formation and capacity equipment, in particular to a battery formation and capacity system. Background technique [0002] The battery formation and capacity equipment is the production equipment of the battery factory. Rechargeable batteries generally require several rounds of charge and discharge tests before they are manufactured to activate the chemicals inside the battery, which is called formation. Due to individual differences, even batteries of the same batch have different capacities, and batteries of the same capacity often need to be combined in series and parallel when used. In this way, batteries of the same capacity are required to be detected and paired. It's called capacity. Therefore, the chemical capacity device needs to charge and discharge the battery, and calculate the capacity of each battery during the charging and discharging process. The device can set the charge and discharge vol...

AI Technical Summary

Problems solved by technology

[0007] 1) The battery pack has a large volume, and because it is often in the state of charging and discharging, its life is short, it needs to be replaced frequently, and the maintenance cost is high

[0008] 2) There is a mismatch between the energy of the battery pack and the energy of the battery under test. When the energy of the battery under test is greater than the energy that the battery pack can absorb, the voltage of the battery bank will be very high when the battery under test is discharged, and even the battery pack will be burned

The problem with this method is that when users use it, they need to distribute the batteries in the charging state and the discharging state evenly, otherwise, the electronic load is always in the working state. Since the electronic load is energy-consuming, the energy-saving effect will be greatly reduced.

[0014] 1) The DC-DC unit connected to the battery works in PWM mode, the current ripple is large, and the current accuracy cannot meet the requirements of small-capacity batteries

[0015] 2) The DC-DC corresponding to each battery requires a lot of power devices and control devices, the cost is high, and the power saving benefit and price ratio are not competitive

Images