State detection circuit of multiple rechargeable batteries in series connection
A technology for rechargeable batteries and state detection, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., to achieve the effect of saving costs and reducing circuit area
Active Publication Date: 2012-09-26
BYD SEMICON CO LTD
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Problems solved by technology
[0012] The present invention solves the problem in the prior art that each battery requires a state judging module, thereby providing a state detection circuit for multi-cell series rechargeable batteries that only needs one state judging module
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[0025] image 3 It is a schematic block diagram of the detection circuit of the first embodiment of the present invention; a state detection circuit of a multi-section series rechargeable battery, including: a control module 2 for generating timing signals for time-sharing control; a time-sharing sampling module 3 for according to The timing signal generated by the control module samples the voltage of multiple rechargeable batteries connected in series in time, and obtains the sampled voltage values at both ends of the battery; the state judging module 4 is used to obtain the battery state of the battery according to the sampled voltage values at both ends of the battery. The timing signal provided by the control module 2 is used to control the time-sharing sampling module 3 to perform time-sharing sampling, thereby obtaining the sampling voltage values at both ends of the battery in time-sharing, so that only one state judgment module is needed, thereby reducing the cir...
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The invention, which relates to the protection circuit field of rechargeable batteries, particularly discloses a state detection circuit of multiple rechargeable batteries in series connection. The state detection circuit comprises: a control module, which is used for generating a sequence signal controlled in a time-sharing way; a time-sharing sampling module, which is used for carrying out time-sharing sampling on voltages of multiple rechargeable batteries in series connection according to the sequence signal generated by the control module so as to obtain sampling voltage values at two ends of the batteries; and a state determination module, which is used for obtaining the states of the batteries according to the sampling voltage values at two ends of the batteries. The sequence signal provided by the control module is utilized to control the time-sharing sampling module to carry out time-sharing sampling, thereby obtaining sampling voltage values at two ends of the batteries in a time-sharing way; therefore, only one state determination module is need, thereby reducing the circuit area and saving cost.
Description
technical field [0001] The invention relates to the field of rechargeable battery protection circuits, in particular to a state detection circuit for multiple serially connected rechargeable batteries. Background technique [0002] Lithium-ion batteries are used extensively in portable battery electronics. When the lithium-ion battery is overcharged, the battery energy will be excessive, and the temperature of the battery will rise, and the electrolyte will decompose to generate gas, which may cause fire or rupture due to the increase in internal pressure and temperature. Conversely, in the over-discharged state, the electrolyte solution decomposes, resulting in deterioration of the capacity characteristics and durability of the battery cell (that is, a reduction in the number of charging cycles). In order to avoid the occurrence of the above-mentioned overcharging and over-discharging, and then prevent the deterioration of battery characteristics, integrated circuits dedic...
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IPC IPC(8): G01R31/36
Inventor 李杰王小平白青刚高志宇
Owner BYD SEMICON CO LTD