Pure electric vehicle battery charging protection method and device
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A pure electric vehicle and battery charging technology, which is applied in the field of pure electric vehicle battery charging protection methods and devices, can solve problems such as battery deterioration, serious accidents, and failure to intervene in time, so as to avoid abnormal voltage differences, improve safety, and improve safety sexual effect
Inactive Publication Date: 2020-12-01
JIANGXI JIANGLING GRP NEW ENERGY AUTOMOBILE CO LTD
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Problems solved by technology
[0005] An object of the present invention is to propose a battery charging protection method for pure electric vehicles to solve the problem that the battery management system in the prior art does not monitor the voltage drop of the battery, which makes the system prone to false alarms and cannot give early warning. Failure to intervene in time when the voltage drops, continuing to charge will cause the battery to deteriorate and cause serious accidents
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Embodiment 1
[0053] see figure 1 , a battery charging protection method for a pure electric vehicle provided in the first embodiment of the present invention includes steps S101-S105.
[0054] S101. When the battery starts to be charged, clear the current information stored in the system within the first preset time period, and at the same time clear the battery voltage backup information.
[0055] Wherein, the first preset time is, for example, 1s.
[0056] S102. Collect voltage and current information of any battery cell, and determine whether the current of the battery cell is stable.
[0057] Wherein, when the battery is in the slow charging state, the step of judging whether the current of the battery cell is stable specifically includes:
[0058] Judging whether the battery cell satisfies condition 1, condition 2, and condition 3 at the same time, the condition 1 is that CC is detected, the CP signal is normal and there is no battery system failure, and the condition 2 is that the co...
Embodiment 2
[0078] see figure 2 , a pure electric vehicle battery charging protection device provided in the second embodiment of the present invention, comprising:
[0079] The clearing module is used to clear the current information stored in the system within the first preset time when the battery starts to charge, and clear the voltage backup information of the monomer at the same time;
[0080] The collection and judgment module is used to collect the voltage and current information of any battery cell, and judge whether the current of the battery cell is stable;
[0081] Wherein, when the battery is in a slow charging state, the acquisition and judgment module is used for:
[0082] Judging whether the battery cell satisfies condition 1, condition 2, and condition 3 at the same time, the condition 1 is that CC is detected, the CP signal is normal and there is no battery system failure, and the condition 2 is that the collected current change is less than the first preset The third...
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Abstract
The invention provides a pure electric vehicle battery charging protection method and device. The method comprises the following steps that: the internal storage information of a system is emptied when a battery starts to be charged; voltage and current information of any battery cell is collected, and whether the current of the battery cell is stable or not is judged; if the current of the battery cell is stable, a first voltage value of the battery cell is acquired, and a second voltage value of the battery cell is acquired after T seconds; voltage difference value of the battery cell is calculated according to the first voltage value and the second voltage value, and the voltage difference values of all the battery cells in the system in a preset sampling period are recorded; and when the voltage difference value of any battery cell in the preset sampling period is greater than the threshold value, fault latching is carried out, and charging is forbidden. According to the method anddevice, whether a fault occurs or not is judged by judging a voltage drop condition when current is stable, voltage difference abnormity caused by current fluctuation is avoided, and the accuracy ishigh; and the abnormal drop of the voltage of each cell in a charging process is judged, the fault is locked, and therefore, safety is improved.
Description
technical field [0001] The invention relates to the field of pure electric vehicle batteries, in particular to a charging protection method and device for pure electric vehicle batteries. Background technique [0002] Electric vehicles have become the mainstream of new vehicles worldwide, and the power source of electric vehicles is batteries. The battery provides the driving force for the vehicle, and its safety performance greatly affects the performance of the vehicle. [0003] Based on the working principle of lithium-ion batteries, during the charging process, the cumulative growth of lithium crystal dendrites is the main risk of internal short-circuit failure of lithium batteries, and the direct phenomenon is the drop of cell voltage. [0004] When batteries are connected in series and parallel into groups, information such as battery voltage and current is generally collected through the battery management system. However, the battery management system generally dete...
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Application Information
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