Electricity-storage device provided with balancing circuit
A technology of balancing circuit and power storage group, applied in the field of power storage system, can solve the problems of large size and increased charger loss, etc.
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Embodiment 1
[0080] Figure 4 It is a circuit diagram of the electricity storage system of Example 1 of this invention. In this embodiment, in the capacitor module 109 formed by connecting m capacitor banks of the rated voltage Vc in series, n taps are provided for each capacitor unit composed of h capacitor banks, and the charger 112 is used to Voltage V in When fully charging the capacitor module including the balancing circuit 105 (voltage between both terminals=Vc×m), the case of m=100, n=51, and h=2 will be described as an example.
[0081] Here, the balance circuit is a circuit for correcting the unevenness of the charging and discharging states of the storage groups constituting the storage module, and can perform energy transfer between the storage groups during both charging and discharging, that is, Balancing action. Generally, there are methods using capacitors, coils, and transformers in balanced circuits, and various specific circuits are known (for example, refer to Patent...
Embodiment 2
[0090] Figure 6 It is a circuit diagram of the electric storage system of Example 2 of this invention. In this figure, with Figure 4 Corresponding parts are denoted by the same reference numerals, and the description of the same parts as in Embodiment 1 is omitted.
[0091] The structure of Embodiment 1 is such that the high-potential side terminal 101 of the charger 112 is connected to each tap of the capacitor module 109 via the switch group 110. In contrast, the present embodiment connects the low-potential side terminal 102 and the capacitor module 109, set by S 1b to S 50b The switch group 111 formed. In this embodiment, according to the voltage detection result of the voltage detection circuit 106, the switch uses the switch control circuit 108 to S 1b , S 2b ,...,S 50b switch in sequence.
[0092] In the above embodiments, the operation of the balance circuit described is ideal, and the premise is that the voltage of each capacitor bank constituting the capaci...
Embodiment 3
[0095] Figure 8 It is a circuit diagram of the power storage system of Example 3 of the present invention. In this figure, with Figure 4 Corresponding parts are assigned the same reference numerals, and descriptions of the same parts as in Embodiment 1 are omitted.
[0096] The structure of Embodiment 1 is that the low potential side terminal 102 of the charger is directly connected to the ground wire 0 of the capacitor module 109. In contrast, in this embodiment, the low potential side terminal 102 is not directly connected to the ground wire 0 of the capacitor module 109. connected, but fixedly connected to the capacitor bank C 2 and C 3 the series connection point.
[0097] In this embodiment, according to the voltage detection result of the voltage detection circuit 106, the switch utilizes the switch control circuit 108 to set S 51a , S 50a ,...,S 3a Switch sequentially.
[0098] In the configuration of Example 1, at the end of the charging process, the switch S...
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