Daisy chain communication bus and protocol
First Claim
1. A battery pack, comprising:
- a first battery terminal and a second battery terminal;
a plurality of battery units, each said battery unit comprising;
a battery cell;
a cell supervisor electrically connected to the battery cell, the cell supervisor comprising a set of registers put in series; and
a communication section configured to communicate with the cell supervisor, the communication section comprising a data buffer;
wherein all of said battery cells are connected serially between the first battery terminal and the second battery terminal;
a plurality of bus interfaces arranged in alternating fashion with said battery units to define a daisy chain bus, each said bus interface configured for signal communication, each said bus interface respectively connecting the communication sections of two adjacent said battery units; and
a battery manager configured to communicate with said battery units via the daisy chain bus,wherein the battery pack is configured so that the battery manager sends a command message to the battery units using a through mode protocol, and each said battery unit sends at least one of a confirmation message and a service request to the battery manager using a shift mode protocol, wherein in the through mode protocol, data is transferred via the data buffer, while in the shift mode protocol, data is shifted along the set of registers.
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Accused Products
Abstract
A battery pack has first and second battery terminals, plural battery cells each with a battery element, a cell supervisor electrically connected to the battery element, and a communication section to communicate with the cell supervisor. The battery elements are connected serially between the first and second battery terminals. Bus interfaces are arranged in alternating fashion with the battery cells to define a daisy chain bus, each such bus interface being configured for signal communication, the interfaces respectively connecting the communication sections of two adjacent battery cells. A battery manager communicates with the battery cells via the daisy chain bus. The battery manager sends a command message to the battery cells using a through mode protocol, and each battery cell sends at least one of a confirmation message and a service request to the battery manager using a shift mode protocol.
27 Citations
20 Claims
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1. A battery pack, comprising:
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a first battery terminal and a second battery terminal; a plurality of battery units, each said battery unit comprising; a battery cell; a cell supervisor electrically connected to the battery cell, the cell supervisor comprising a set of registers put in series; and a communication section configured to communicate with the cell supervisor, the communication section comprising a data buffer; wherein all of said battery cells are connected serially between the first battery terminal and the second battery terminal; a plurality of bus interfaces arranged in alternating fashion with said battery units to define a daisy chain bus, each said bus interface configured for signal communication, each said bus interface respectively connecting the communication sections of two adjacent said battery units; and a battery manager configured to communicate with said battery units via the daisy chain bus, wherein the battery pack is configured so that the battery manager sends a command message to the battery units using a through mode protocol, and each said battery unit sends at least one of a confirmation message and a service request to the battery manager using a shift mode protocol, wherein in the through mode protocol, data is transferred via the data buffer, while in the shift mode protocol, data is shifted along the set of registers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A battery unit for use in a battery pack having battery manager, the battery unit comprising:
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a battery cell; a cell supervisor electrically connected to the battery cell, the cell supervisor comprising a set of registers put in series; and a communication section configured to communicate with the cell supervisor, the communication section comprising a data buffer; wherein the battery unit is configured to receive a command message from the battery manager using a through mode protocol, and to send at least one of a confirmation message and a service request to the battery manager using a shift mode protocol, wherein in the through mode protocol, data is transferred via the data buffer, while in the shift mode protocol, data is shifted along the set of registers. - View Dependent Claims (10, 11)
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12. A method of communication via a daisy chain bus connecting a battery manager and a plurality of battery units, comprising:
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sending, via the daisy chain bus, a command message from the battery manager to the battery units using a through mode protocol, wherein in the through mode protocol, data is transferred via a plurality of data buffers each arranged in each of the battery units; and sending, via the daisy chain bus, at least one of a confirmation message and a service request from at least one said battery unit to the battery manager using a shift mode protocol, wherein in the shift mode protocol, data is shifted along a plurality of sets of registers each set put in series in each of the battery units. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification