| CPC H02J 7/00308 (2020.01) [G01R 31/3835 (2019.01); G01R 31/396 (2019.01); H01M 10/441 (2013.01); H01M 10/46 (2013.01); H01M 10/482 (2013.01); H01M 50/204 (2021.01); H01M 50/296 (2021.01); H01M 50/51 (2021.01); H01M 50/583 (2021.01); H02J 7/0013 (2013.01); H02J 7/0036 (2013.01); H02J 7/007 (2013.01); H01M 2200/103 (2013.01)] | 10 Claims |
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1. A charge control circuit for protecting a cell pack in which a plurality of secondary cells are connected in series by blowing a fuse in a charge path, the charge control circuit comprising:
a plurality of input ports to which a positive electrode terminal, a plurality of intermediate terminals, and a negative electrode terminal of the cell pack are connected;
a cell connection detection circuit which is connected to the plurality of input ports, and detects that all terminals of the cell pack are connected to the plurality of input ports by monitoring a voltage between the input ports;
an overvoltage detection circuit which is connected to the plurality of input ports, and monitors an overvoltage of the plurality of secondary cells;
a first latch circuit which receives a signal output by the cell connection detection circuit;
a second latch circuit which receives a signal output by the overvoltage detection circuit;
a reset circuit which outputs a signal to the first latch circuit and the second latch circuit when the charge control circuit is activated;
a control circuit which receives a signal output by the second latch circuit, and outputs a signal for protecting the cell pack from the overvoltage; and
a mask circuit which is controlled by an output signal of the first latch circuit,
wherein the second latch circuit receives the signal output by the overvoltage detection circuit via the mask circuit,
wherein the control circuit does not output a signal for blowing the fuse until the first latch circuit receives a detection signal of the cell connection detection circuit.
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