Two-stage charge equalization method and apparatus for series-connected battery string
First Claim
1. A two-stage charge equalization apparatus for a series-connected battery string, comprising:
- a battery module having a plurality of batteries connected in series;
a battery string having M (M≧
2) battery modules connected in series;
M charge control switch modules connected in parallel to each of the M battery modules;
M second DC/DC converters connected to each of the M charge control switch modules;
a single first DC/DC converter connected to the M second DC/DC converter; and
a microprocessor controlling the charge control switch module,wherein the single first DC/DC converter is inputted with an overall potential of the battery string and outputs a potential lower than the potential inputted and each of batteries composing the battery module shares the second DC/DC converter using the charge control switch module.
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Accused Products
Abstract
A two-stage charge equalization apparatus for a series-connected battery string includes a battery module having a plurality of batteries connected in series; a battery string having M (M≧2) battery modules connected in series; M charge control switch modules connected in parallel to each of the M battery modules; M second DC/DC converters connected to each of the M charge control switch modules; a single first DC/DC converter connected to the M second DC/DC converter; and a microprocessor controlling the charge control switch module, wherein the first DC/DC converter is inputted with an overall potential of the battery string and outputs a potential lower than the potential inputted and each of batteries composing the battery module shares the second DC/DC converter using the charge control switch module.
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Citations
19 Claims
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1. A two-stage charge equalization apparatus for a series-connected battery string, comprising:
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a battery module having a plurality of batteries connected in series; a battery string having M (M≧
2) battery modules connected in series;M charge control switch modules connected in parallel to each of the M battery modules; M second DC/DC converters connected to each of the M charge control switch modules; a single first DC/DC converter connected to the M second DC/DC converter; and a microprocessor controlling the charge control switch module, wherein the single first DC/DC converter is inputted with an overall potential of the battery string and outputs a potential lower than the potential inputted and each of batteries composing the battery module shares the second DC/DC converter using the charge control switch module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A charge equalization method for a two-stage charge equalization apparatus comprising a battery module having a plurality of batteries connected in series;
- a battery string having M (M≧
2) battery modules connected in series;
M charge control switch module connected in parallel to each of the M battery modules;
M second DC/DC converters connected to each of the M charge control switch modules;
a single first DC/DC converter connected to the M second DC/DC converter;
a voltage sensing module including a multiplexer, a voltage sensor and an A/D converter; and
a microprocessor controlling the charge control switch module, the multiplexer, the single first DC/DC converter and the M second DC/DC converters, comprising steps of;(a) measuring a potential of each battery composing the battery string by using the voltage sensing module; (b) selecting low-charged battery based on the detected potential; (c) controlling the charge control switch module to cause the low-charged battery and an output of the second DC/DC converter to be connected in parallel; (d) operating the second DC/DC converter; and (e) operating the single first DC/DC converter to charge the low-charged battery. - View Dependent Claims (15, 16, 17, 18, 19)
- a battery string having M (M≧
Specification