Battery temperature difference self-adaption threshold value determination method and system
A technology of adaptive threshold and determination method, which is applied in information technology support system, secondary battery repair/maintenance, electric vehicles, etc., can solve the problems of dynamic adjustment, power battery temperature difference threshold, etc., and achieve the goal of improving driving safety Effect
Active Publication Date: 2021-10-22
CHANGAN UNIV
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Benefits of technology
This technology helps adjust the voltage for an electrical car's batteries by measuring their temperatures during different stages or modes of use (starting at low). By comparing this data against predetermined thresholds set up beforehand, it becomes possible to determine if there are any issues that may affect how well these cells work properly when used together under certain conditions such as high ambient air pressure or heavy rain. These technical effectings help improve the performance and reliability of the energy storage system while reducing its risk of damage from excess heat caused by overcharged states.
Problems solved by technology
This patented technical problem addressed in this patents relates to improving the security and reliability of Lithium ion (Li) power batterys used in hybrid cars during their lifecycle from production until use again without losing any significant amount of usage due to damage caused by excess heat generated inside them. Current methods involve measuring changes over time with external sensors such as thermometers attached directly onto the surface of Li plating material. However, these techniques may be affected by factors like environmental variables affecting how well they work properly. Additionally, current methodologies require manual adjustment after every measurement period which could result in errors if done incorrectly. Therefore there needs improvement in identifying accurate temperature variations within LixCoS materials used in Power Battery Cells.
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[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0046] see figure 1 , the battery temperature difference adaptive threshold determination method of the present invention comprises the following steps:
[0047] (1) First, divide the vehicle status according to the data uploaded by the electric vehicle, as shown in Table 1;
[0048] Table 1
[0049] vehicle status division principle Charge The vehicle status is off and the charging status is parking and charging run The vehicle status is activated and the charging status is driving charging or not charging stand still Vehicle status other than charging and running
[0050](2) The time t when the electric vehicle uploads data for the first time can be read on the national electric vehicle big data platform 0 , according to the current time t and t 0 time interval between, if t-t 0 ≤7879680s, that is, the
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The invention discloses a battery temperature difference self-adaption threshold value determining method and system. The method comprises the steps of dividing a vehicle state into a charging state, an operation state and a standing state according to the data uploaded by an electric vehicle, calculating the time interval between the first data uploading time of the vehicle and the current time, and if the time interval is less than or equal to three months, determining that the temperature difference threshold value is a threshold value specified by an enterprise when the vehicle leaves a factory, if the time interval is longer than three months, extracting the temperature of the power battery according to different vehicle states, and constructing a power battery temperature database in charging, operation and standing states, extracting temperature difference values to construct a power battery temperature difference database, and determining the window length of the sliding window based on temperature difference threshold stability, and determining temperature difference threshold values in different states according to the window length of the sliding window based on the Pauta criterion. The invention also provides a battery temperature difference self-adaption threshold value determining system. The threshold value is determined for the power battery temperature difference based on different states of the vehicle, and the driving safety is improved.
Description
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