Multi-cell protection circuit and method
First Claim
1. A multi-cell protection circuit, comprises:
- a first multi-cell protection chip and a second multi-cell protection chip, wherein each multi-cell protection chip comprises a serially connected multi-cell battery protection integrated circuit module and an expansion connection module, and input terminals of the serially connected multi-cell battery protection integrated circuit module are connected to positive and negative poles of corresponding cells, and output terminals of the serially connected multi-cell battery protection integrated circuit module are connected to interior signal input terminals of the expansion connection module;
a charge control switch and a discharge control switch,wherein;
expansion signal input terminals of the expansion connection module in the first multi-cell protection chip are connected to corresponding expansion signal output terminals of the expansion connection module in the second multi-cell protection chip, thereby the two multi-cell protection chips are connected together, andexpansion signal output terminals of the expansion connection module in the first multi-cell protection chip are connected to the charge control switch and the discharge control switch, respectively,the second multi-cell protection chip is configured to make a second logical decision based on a status of the cells associated with the second multi-cell protection chip and export the second logical decision to the first multi-cell protection chip through the expansion signal output terminals of the expansion connection module in the second multi-cell protection chip,the first multi-cell protection chip is configured to make a first logical decision based on a status of the cells associated with the first multi-cell protection chip and the second logical decision from the second multi-cell protection chip received through the expansion signal input terminals of the expansion connection module in the first multi-cell protection chip, and control operations of the charge control switch and the discharge control switch, respectively, in accordance with the first logical decision,wherein the expansion connection module of the first multi-cell protection chip further comprises;
an expansion signal processing module, configured to convert the expansion output signals of the second multi-cell protection chip to expansion input signals that can be identified by the first multi-cell protection chip;
an expansion selection control signal processing module, configured to convert the expansion selection control signal of the first multi-cell protection chip into an expansion selection control signal that can be identified by the first multi-cell protection chip;
a logical processing module, configured to carry out the logical decision for the interior input signals, the expansion input signals, and the expansion selection control signals; and
an output stage module, configured to output an expansion output signal according to the logical decision result of the logical processing module.
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Abstract
A multi-cell protection circuit and method. The multi-cell protection circuit comprises one or more multi-cell protection chips, a charge control switch (M2) and a discharge control switch (M1). Each multi-cell protection chip comprises a multi-cell protection integrated circuit module and an expansion connection module. The input terminals (VC1, VC2, VC3, GND1, VC4, VC5, VC6, VC7, GND) of the multi-cell protection integrated circuit module are connected to the positive and negative poles of corresponding cells. The output terminals (co, do) of the multi-cell protection integrated circuit module are connected to the interior signal input terminals (Dco, Ddo) of the expansion connection module. The expansion signal input terminals (exterior.co, exterior.do) of the expansion connection module are connected to expansion signal output terminals (Co′, Do′) of an expansion connection module in a multi-cell protection chip adjacent to this multi-cell protection chip. The output terminals (Co′, Do′) of the expansion connection module in the last multi-cell protection chip among the multi-cell protection chips connected in the multi-cell protection circuit are connected to the charge control switch and the discharge control switch, respectively.
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Citations
11 Claims
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1. A multi-cell protection circuit, comprises:
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a first multi-cell protection chip and a second multi-cell protection chip, wherein each multi-cell protection chip comprises a serially connected multi-cell battery protection integrated circuit module and an expansion connection module, and input terminals of the serially connected multi-cell battery protection integrated circuit module are connected to positive and negative poles of corresponding cells, and output terminals of the serially connected multi-cell battery protection integrated circuit module are connected to interior signal input terminals of the expansion connection module; a charge control switch and a discharge control switch, wherein; expansion signal input terminals of the expansion connection module in the first multi-cell protection chip are connected to corresponding expansion signal output terminals of the expansion connection module in the second multi-cell protection chip, thereby the two multi-cell protection chips are connected together, and expansion signal output terminals of the expansion connection module in the first multi-cell protection chip are connected to the charge control switch and the discharge control switch, respectively, the second multi-cell protection chip is configured to make a second logical decision based on a status of the cells associated with the second multi-cell protection chip and export the second logical decision to the first multi-cell protection chip through the expansion signal output terminals of the expansion connection module in the second multi-cell protection chip, the first multi-cell protection chip is configured to make a first logical decision based on a status of the cells associated with the first multi-cell protection chip and the second logical decision from the second multi-cell protection chip received through the expansion signal input terminals of the expansion connection module in the first multi-cell protection chip, and control operations of the charge control switch and the discharge control switch, respectively, in accordance with the first logical decision, wherein the expansion connection module of the first multi-cell protection chip further comprises; an expansion signal processing module, configured to convert the expansion output signals of the second multi-cell protection chip to expansion input signals that can be identified by the first multi-cell protection chip; an expansion selection control signal processing module, configured to convert the expansion selection control signal of the first multi-cell protection chip into an expansion selection control signal that can be identified by the first multi-cell protection chip; a logical processing module, configured to carry out the logical decision for the interior input signals, the expansion input signals, and the expansion selection control signals; and an output stage module, configured to output an expansion output signal according to the logical decision result of the logical processing module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for protecting a multi-cell battery using a first multi-cell protection chip and a second multi-cell protection chip, wherein each multi-cell protection chip comprises a serially connected multi-cell battery protection integrated circuit module and an expansion connection module, and input terminals of the serially connected multi-cell battery protection integrated circuit module are connected to positive and negative poles of corresponding cells, and output terminals of the serially connected multi-cell battery protection integrated circuit module are connected to interior signal input terminals of the expansion connection module, comprises the following steps:
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each multi-cell protection chip generating interior output signals that indicate the cell state, according to the state of the cell monitored by the protection chip; the second multi-cell protection chip carrying out a second logical decision based on a status of the cells associated with the second multi-cell protection chip and exporting the second logical decision to the first multi-cell protection chip; the first multi-cell protection chip carrying out a first logical decision based on a status of the cells associated with the first multi-cell protection chip and the second logical decision from the second multi-cell protection chip; and the first multi-cell protection chip controlling ON/OFF state of the cell charge/discharge circuit, according to the first logical decision of the first multi-cell protection chip, wherein the first multi-cell protection chip is further configured to; convert expansion output signals of the second multi-cell protection chip to expansion input signals that can be identified by the first multi-cell protection chip; convert expansion selection control signal of the first multi-cell protection chip into an expansion selection control signal that can be identified by the first multi-cell protection chip; carry out the first logical decision for the interior input signals, the expansion input signals, and the expansion selection control signals; and output an expansion output signal for controlling the ON/OFF state of the cell charge/discharge circuit.
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11. A multi-cell protection circuit, comprises one or more multi-cell protection chips, a charge control switch and a discharge control switch, wherein each multi-cell protection chip comprises a serially connected multi-cell battery protection integrated circuit module and an expansion connection module;
- the input terminals of the serially connected multi-cell battery protection integrated circuit module are used to connect to the positive and negative poles of corresponding cells, and the output terminals are connected to the interior signal input terminals of the expansion connection module;
the expansion signal input terminals of the expansion connection module are connected to expansion signal output terminals of an expansion connection module in a multi-cell protection chip adjacent to this multi-cell protection chip, thereby the multi-cell protection chips connect together, and the expansion signal output terminals of the expansion connection module in the last connected multi-cell protection chip among the connected multi-cell protection chips are connected to the charge control switch and the discharge control switch, respectively, wherein the expansion connection module comprises;
an expansion signal processing module, configured to convert the expansion output signals of the adjacent multi-cell protection chip to expansion input signals that can be identified by the multi-cell protection chip;
an expansion selection control signal processing module, configured to convert the expansion selection control signal of the multi-cell protection chip into an expansion selection control signal that can be identified by the multi-cell protection chip;
a logical processing module, configured to carry out logical operation for the interior input signals, the expansion input signals, and the expansion selection control signals; and
an output stage module, configured to output an expansion output signal according to the logical operation result of the logical processing module, wherein the multi-cell protection chips are connected through their expansion connection modules in upstream or downstream signal transmission direction;
in case of upstream signal transmission direction, the charge control switch and discharge control switch employ PMOSFETs and is connected with the uppermost multi-cell protection chip;
in case of downstream signal transmission direction, the charge control switch and discharge control switch employ NMOSFETs, and is connected with the bottommost multi-cell protection chip, wherein if the multi-cell protection chips are connected through their expanded connection modules in upstream signal transmission direction;the expansion selection control signal processing module comprises a first input terminal and a second input terminal;
the first input terminal of the bottommost multi-cell protection chip is connected to high level or in float state, and the first input terminals of the other multi-cell protection chips are connected to low level;
the second input terminal of the topmost multi-cell protection chip is connected to high level or in float state, and the second input terminals of the other multi-cell protection chips are connected to low level;the expansion signal processing module pulls up the high impedance state of the expansion output signal of the adjacent multi-cell protection chip to high level by means of a pull-up resistor and a level shifting device; the logical processing module carries out logical operation for the interior input signals, the expansion output signals, and the expansion selection control signal with NAND gate or AND gate.
- the input terminals of the serially connected multi-cell battery protection integrated circuit module are used to connect to the positive and negative poles of corresponding cells, and the output terminals are connected to the interior signal input terminals of the expansion connection module;
Specification