A voltage detection circuit and method for a power battery circuit
A technology of power battery circuit and voltage detection circuit, which is applied in the field of voltage detection circuit and electric vehicle, can solve the problems of low cost and error accuracy of multiple detection circuits, and achieve the effect of low cost, high precision and accuracy, and simple principle
Active Publication Date: 2022-04-29
BEIJING ELECTRIC VEHICLE
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Problems solved by technology
[0007] Embodiments of the present invention provide a voltage detection circuit and method for a power battery circuit, which are used to solve the problems of detection errors and low precision in the prior art and the need for multiple detection circuits with high cost
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[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0042] The invention provides a voltage detection circuit and method for a power battery circuit aiming at the problems of detection errors and low precision in the prior art and the need for multiple detection circuits with high cost.
[0043] Such as figure 2 As shown, the embodiment of the present invention provides a voltage detection circuit for a power battery circuit, including:
[0044] Main insurance S, pre-charging resistor Rp, main positive relay K1, main negative relay K2 and pre-charging relay K3; the positive pole of the power battery E is connected to the positive pole of the output port through the pre-charging resistor Rp and pre-charging relay K3; The negative pole of the power battery E is connected to the negative pole of the o...
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The present invention provides a voltage detection circuit and method for a power battery circuit. The detection circuit includes: a main fuse, a pre-charging resistor, a main positive relay, a main negative relay, and a pre-charging relay; the positive pole of the power battery passes through the The pre-charging resistance and the pre-charging relay are connected to the positive pole of the output port; the negative pole of the power battery is connected to the negative pole of the output port through the main insurance and the main negative relay; a plurality of switch circuits, each of which includes a series connection A resistance and a switch device; a detection circuit, the detection circuit includes a sampling resistance and a voltage detection device connected across the two ends of the sampling resistance. The detection method includes: controlling the working state of the switch device in the switch circuit according to the target voltage to be tested; detecting the voltage signal collected by the detection circuit, and calculating the target voltage according to the voltage signal. The present invention reduces the number of amplifiers and resistors through H-bridge switching.
Description
technical field [0001] The invention relates to a battery management system, in particular to a voltage detection circuit and device for a power battery circuit and an electric vehicle. Background technique [0002] The important functions of the battery management system BMS include the following voltage monitoring functions: monitoring the internal voltage of the battery and the output terminal of the battery circuit, that is, the voltage of the vehicle terminal; monitoring the rear of the pre-charging resistor, that is, the voltage of the pre-charging relay to judge The working state of the resistor; monitor the state of the two relay switches of the battery system, such as whether the relay is stuck or broken. [0003] The circuit principle of the mainstream solution in the prior art is as follows: figure 1 Shown: [0004] Three voltage dividing circuits obtain three voltages, three integrated operational amplifiers sample small voltages, send them to the BMS processor...
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IPC IPC(8): H01M10/42G01R31/3835G01R31/327G01R19/00
CPCH01M10/4257G01R31/3835G01R19/0084G01R31/3278H01M2010/4271H01M2010/4278Y02E60/10
Inventor 李焕明
Owner BEIJING ELECTRIC VEHICLE