Method and device for detecting internal resistance of battery
A battery internal resistance and detection method technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of prolonged battery terminal voltage detection time, large error of battery internal resistance, etc.
Inactive Publication Date: 2017-07-21
ANHUI RNTEC TECH CO LTD
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[0004] The purpose of the present invention is to overcome the problem of large error in online measurement of battery internal resistance caused by the delay problem existing in the prior art when measuring battery terminal voltage and current, and to provide a method for detecting battery internal resistance and device, the method detects the voltage value U of the battery charging state 1 and the voltage value U after disconnecting the charge 2 and the charging current I, and prolong the detection time of the battery terminal voltage, that is, set two time points t respectively 1 and t 2 Detect the voltage value U of the battery charging state respectively 1 and the voltage value U after disconnecting the charge 2 , the set time Δt between the two time points is used to wait for the battery terminal voltage to be stable, and to perform the above detection at the set temperature and battery charging state, according to the voltage value U 1 with the voltage value U 2 The difference between and the charging current I, determine the internal resistance value R of the battery n , also the internal resistance value R n with the last internal resistance value R n-1 For comparison, when the comparison difference is not greater than the preset difference, the internal resistance value R n Update to the internal resistance value of the battery; the device completes the detection and update of the internal resistance of the battery through the detection unit and the control unit through the above method
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[0020] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0021] In the present invention, in the case of no contrary description, the orientation words used such as "up, down, left, right", "inner, outer", "far, near" refer to the directions of the drawings, therefore, The use of directional terms is illustrative and not limiting of the invention.
[0022] figure 1 It shows a schematic diagram of the basic steps of a battery internal resistance detection method provided by an embodiment of the present invention, as figure 1 As shown, the method may include: when the battery is in a charged state, measuring the battery voltage value U 1 and the charging current I; switch the charging state of the battery to the disc...
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The invention relates to the field of battery detection, and discloses a method and device for detecting the internal resistance of a battery. The method is characterized in that the method comprises the steps: measuring the voltage value U1 and charging current I of the battery when the battery is in a state of charging; switching the charging state of the battery to a switching-off state, and measuring the voltage value U2 of the battery after the charging is cut off; determining the internal resistance Rn of the battery according to the difference between the voltage value U1 and the voltage value U2 and the charging current I.
Description
technical field [0001] The invention relates to the field of battery detection, in particular to a method and device for detecting battery internal resistance. Background technique [0002] The internal resistance is an important parameter of the lithium battery, which directly determines the available power of the lithium battery pack and affects the power of the electric vehicle. At the same time, the internal resistance also reflects the state of health of the lithium battery (State-of-Health, SOH), compared with when the battery just leaves the factory, as the number of cycles of the battery increases, the internal resistance of the battery will gradually increase due to the decrease in the activity of the chemical substances inside the battery and the aging of the electrode material. Therefore, the internal resistance change is also One of the ways to estimate the state of health of lithium batteries. [0003] Since the internal resistance of lithium batteries is small...
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Login to View More IPC IPC(8): G01R31/36
CPCG01R31/389
Inventor 曾国建朱建吉祥范晓东许海丽颛孙明明
Owner ANHUI RNTEC TECH CO LTD