Battery Control Device Adjusting Lower-Limit SOC to Prevent Slip

The patent applies dynamics by dynamically adjusting the lower-limit SOC based on the calculated volume decrease of the secondary battery. Instead of using a fixed clamping load designed for maximum volume decrease scenarios, the system adapts the operational parameters (lower-limit SOC) according to the actual battery volume, which correlates with the rate of decrease of full charging capacity. This allows the clamping load to be optimized for current battery conditions rather than worst-case scenarios, reducing manufacturing costs while maintaining slip prevention reliability.

The patent changes the parameter of lower-limit SOC based on the calculated volume decrease. By storing information indicating the relationship between volume decrease and lower-limit SOC, and adjusting the lower-limit SOC accordingly, the system optimizes the operational range to account for battery deterioration. This parameter adjustment allows the battery to operate safely within reduced volume conditions without requiring increased clamping load, thereby avoiding higher manufacturing costs.

The patent applies dynamics by adjusting the lower-limit SOC dynamically based on the actual volume decrease calculated from the rate of decrease of full charging capacity, rather than setting a fixed high lower-limit SOC in advance. This dynamic adjustment allows the service range to be maintained as large as possible while still preventing battery slip, as the lower-limit SOC is only increased when and if volume decrease actually occurs.

The patent uses feedback by calculating the volume decrease based on the rate of decrease of full charging capacity (obtained from monitoring sensors) and adjusting the lower-limit SOC accordingly. This feedback mechanism ensures that the lower-limit SOC is increased only when necessary, based on actual battery deterioration, rather than preemptively setting a high lower-limit SOC that would unnecessarily narrow the service range.

The patent applies dynamics by adjusting operational parameters (lower-limit SOC) based on actual battery volume conditions, which allows the clamping load to be optimized for current battery state rather than maximum volume decrease scenarios. This dynamic optimization reduces unnecessary stress on components while maintaining adequate slip prevention capability.

The patent avoids excessive action by not setting the clamping load for maximum volume decrease scenarios. Instead, it applies partial action by setting the clamping load appropriate for current battery volume conditions and adjusting the lower-limit SOC accordingly. This prevents components from experiencing excessive stress that would occur with over-designed clamping loads.