Apparatus and method for measuring battery cell voltage

A system comprising:

• a plurality of circuits connected in a daisy chain, each given circuit of the plurality of circuits being configured to:
• measure a property of a device of a plurality of devices that corresponds to the given circuit;
• generate a measurement value corresponding to the given circuit based at least in part on the measurement of the property of the device corresponding to the given circuit;
• receive a bit from a preceding circuit in the daisy chain, the bit from the preceding circuit being generated by the preceding circuit based at least in part on a measurement value generated by the preceding circuit;
• sum the received bit with a corresponding bit of the measurement value corresponding to the given circuit;
• and
• provide the summed bit to a subsequent circuit in the daisy chain,
• wherein each given circuit of the plurality of circuits is configured to:
• receive data from the preceding circuit in the daisy chain bit-by-bit and to provide data to the subsequent circuit in the daisy chain bit-by-bit, the received data comprising the received bit and the provided data comprising the summed bit;
• and
• delay providing the bits to the subsequent circuit by one bit time relative to the receipt of corresponding bits from the preceding circuit.

A method performed by a circuit comprising hardware, the method comprising:

• measuring a voltage of a first battery cell of a battery pack;
• generating a first voltage measurement based at least in part on the measured voltage of the first battery cell;
• receiving a bit of a first response from a second battery management circuit, the bit of the first response being generated by the second battery management circuit based at least in part on a measured voltage of a second battery cell of the battery pack;
• summing the bit of the first response with a corresponding bit of the first voltage measurement;
• and
• providing the summed bit to a third battery management circuit as part of a second response,
• wherein:
• the first response comprises a first plurality of bits;
• the second response comprise a second plurality of bits;
• and
• the method comprises:
• receiving the first response from the second battery management circuit bit-by-bit;
• providing the second response to the third battery management circuit bit-by-bit;
• and
• delaying providing the bits of the second response to the third battery management circuit by one bit time relative to the receipt of corresponding bits of the first response.