Battery deterioration degree estimating device and battery deterioration degree estimating method
A technology of deterioration and degree, which is applied in the field of battery deterioration degree estimation device, and can solve problems such as battery deterioration and driving performance reduction
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no. 1 Embodiment approach
[0028] figure 1 It is a block diagram showing the control content of the first embodiment of the battery deterioration degree estimating device of the present invention.
[0029] The battery deterioration degree estimation device 100 includes a total deterioration degree detection unit 110 , a cycle deterioration estimation unit 120 , a storage deterioration estimation unit 130 , and a battery deterioration estimation unit 140 .
[0030] The total deterioration degree detection unit 110 detects the current total deterioration degree of the battery obtained by adding both the cycle deterioration and the storage deterioration. Details will be described later.
[0031] The cycle degradation estimating section 120 estimates the degree of future cycle degradation due to charging and discharging of the battery. As described above, cycle deterioration is deterioration mechanically exacerbated by friction of electrodes or the like caused by internal expansion and contraction of the ...
no. 2 Embodiment approach
[0062] Figure 10 It is a figure explaining the concept of 2nd Embodiment.
[0063] As mentioned above, the degree of aggravation of storage deterioration corresponds to the square root of time, but also has sensitivity to temperature. For example, if Figure 10 As shown, the higher the temperature, the more likely the deterioration will be aggravated. In addition, the degradation coefficient on the vertical axis is a coefficient multiplied by the capacity maintenance rate. The smaller the degradation coefficient, the smaller the capacity retention rate, that is, the larger the degree of degradation. In the present embodiment, storage deterioration is also calculated in consideration of the previous temperature history (frequency of occurrence of temperature). refer to Figure 11 To illustrate the specific structure.
[0064] Figure 11 It is a block diagram showing the control content of the second embodiment of the battery deterioration degree estimating device of the...
no. 3 Embodiment approach
[0070] Figure 12 It is a figure explaining the concept of 3rd Embodiment.
[0071] The battery temperature changes depending on the external air temperature. Therefore, if Figure 12 As shown, by considering the temperature transition in the past year, the temperature change based on the seasonal variation with a year as a cycle is considered. As a result, the degree of storage deterioration of the battery can be estimated with higher accuracy, and the remaining life of the battery can be estimated more accurately.
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