Battery measurement circuit, system and method
A measurement circuit and measurement method technology, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., can solve the problems of the accuracy of unit voltage measurement, the inability to generate compensation current, etc., to achieve the effect of eliminating negative effects
Active Publication Date: 2015-11-18
AOTU ELECTRONICS WUHAN
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Problems solved by technology
[0004] However, the difference between the positive terminal voltage of the battery cell 111 and the supply voltage of the current generator 160 may be too small, so that the current generator 160 cannot generate a compensation current flowing into the positive terminal of the battery cell 111 to compensate for the voltage drop across the resistor 131
Thus, the voltage drop across resistor 131 can still negatively affect the accuracy of the cell voltage measurement
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[0021] Detailed reference will be given below to examples of the present invention. Although the present invention has been illustrated and illustrated by these embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, the invention covers all alternatives, modifications and equivalents which are within the spirit and scope of the invention as defined by the appended claims.
[0022] In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the gist of the present invention.
[0023] figure 2 Shown is a block diagram of a battery measurement circuit 200 for measuring cell voltages of batte...
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The invention discloses a circuit, system and method for measuring a battery. The circuit is used for measuring a cell voltage of a cell in a battery. The circuit includes a measurement circuit and a current generator. The measurement circuit includes a first terminal coupled to a positive terminal of a cell via a first resistor and includes a second terminal coupled to a negative terminal of the cell via a second resistor. The measurement circuit consumes a first current and a second current. The current generator coupled to the cell generates a first compensation current according to the first current. The measurement circuit receives a first voltage difference between the first terminal and the second terminal. The measurement circuit calculates the cell voltage according to a first voltage difference between the first and second terminals when the first compensation current is disabled and according to a second voltage difference between the first and second terminals when the first compensation current is enabled. According to the invention, negative influence of a voltage drop of the first resistor upon measurement of the cell voltage can be reduced or eliminated.
Description
technical field [0001] The invention relates to the battery field, in particular to a battery measurement circuit, system and method. Background technique [0002] figure 1 Shown is a schematic diagram of a conventional battery measurement circuit 100 for measuring cell voltages of battery cells in a battery pack. The battery measurement circuit 100 includes a battery pack 110 , a level shifter circuit 120 , a resistor set 130 , a capacitor set 180 , a measurement unit 140 , a current generator 160 and a switch set 170 . Such as figure 1 As shown, battery pack 110 includes battery cells 111 to 113 coupled in series. The resistor set 130 includes resistors 131 to 134 . The capacitor group 180 includes a capacitor 182 , a capacitor 184 and a capacitor 186 . The resistor set 130 and the capacitor set 180 are used to filter noise on the signal transmitted between the battery set 110 and the switch set 170 . The switch group 170 is used to select a battery cell from the bat...
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IPC IPC(8): G01R31/36G01R19/00
Inventor 汤小虎栗国星
Owner AOTU ELECTRONICS WUHAN