Panasonic Ev Energy Co., Ltd.

Other

Matsushita Electric Industrial Co., Ltd.

Yusai Murakami

Tadao Kimura

Norito Yamabe

Toshiaki Nakanishi

Seiji Bito

Teruyoshi Egoshi

Yoshiaki Kikuchi

Masahiro Takada

Keiichi Minamiura

Shinichiro Ito

Kunio Kanamaru

Kiwamu Inui

Masayoshi Iwase

Jun Okuda

Akihiro Aoyama

Masayoshi Toyota

Toshihiro Katsuda

Katsuhiko Yamaguchi

Masaru Yonemoto

An apparatus estimates charge/discharge electricity amount without being affected by current measurement error. Under specific selection conditions, a no-load voltage calculation part uses pairs of data consisting of current data I(n) and voltage data V(n) corresponding to the current data to calculate a no-load voltage Vas the voltage intercept at a current of zero in a straight-line approximation obtained by statistical processing such as regression analysis using a least squares method. If specific current conditions exist for a certain amount of time, an open circuit voltage calculation part calculates the terminal voltage of the secondary battery as the open circuit voltage V. An estimated charge/discharge electricity amount calculation part uses a preset change-in-voltage adjustment constant &#x394;V/adjustment coefficient K, change-in-electromotive-force constant Kand polarization voltage generation constant Kto calculate the estimated charge/discharge electricity amount &#x394;Qas a function of the change &#x394;Vin the no-load or open circuit voltage over a predetermined period of time.

Method and apparatus for estimating the charge/discharge electricity amount of secondary batteries

A temperature management apparatus for managing the temperature of cells, which includes an air intake duct, a fan unit, a first temperature detector (temperature sensors, a temperature detecting part) for detecting temperature Tb of the cells, a second temperature detector (a temperature sensor, a temperature detecting part) for detecting ambient temperature Ta, and a control device. The fan unithas a fanand a motor. The control devicehas a storage partand a deciding part. The storage partstores a cooling-necessitating temperature Tc and a heating-necessitating temperature Th. The deciding partdirects the fan unitto drive the fanin a case where the temperature Tb of the cells becomes equal to or higher than both the temperature Ta of the air and the cooling-necessitating temperature Tc, or in a case where the temperature Tb of the cells becomes equal to or lower than both the temperature Ta of the air and the heating-necessitating temperature Th.

Temperature management apparatus and power supply

If a particular selection condition is satisfied, a non-load voltage calculation unit () calculates a no-load voltage Vsep as a voltage piece when the current in approximate straight line obtained by statistical processing using the method of least squares for a plurality of sets of data containing current data I(n) and voltage data V(n) is zero. If a particular current condition or voltage condition is continuously satisfied for a predetermined time, an open-circuit voltage calculation unit () calculates a secondary cell terminal voltage as an open-circuit voltage Voc and a voltage-at-zero-current storing unit () stores voltage-at-zero-current Vzo calculated by a voltage-at-zero-current calculation unit (). By using a predetermined voltage change amount adjustment constant &#x394;Vbc/adjustment coefficient Kb, an electromotive force change constant Keq, and a polarization voltage generation constant Kpol, an estimated charge/discharge electric amount calculation unit (A) calculates an estimated charge/discharge electricity amount &#x394;Qe as a function of the change amount &#x394;Vzo of a voltage-at-zero-current Vzo. It is possible to estimate charge/discharge electricity amount without being affected by the current measurement error.

Secondary battery charge/discharge electricity amount estimation method and device, secondary battery polarization voltage estimation method and device and secondary battery remaining capacity estimation method and device

The present invention provides an apparatus that can estimate the charge/discharge electricity amount without being affected by current measurement error. If specific selection conditions are met, a no-load voltage calculation part () takes a plurality of pairs of data consisting of current data I(n) and voltage data V(n) corresponding to the current data and calculates a no-load voltage Vas the voltage intercept at a current of zero in a straight-line approximation obtained by statistical processing such as regression analysis using a least squares method with respect to the plurality of pairs of data. In addition, if specific current conditions continue to be met for a certain amount of time, an open circuit voltage calculation part () calculates the terminal voltage of the secondary battery as the open circuit voltage V. An estimated charge/discharge electricity amount calculation part () uses a preset change-in-voltage adjustment constant &#x394;V/adjustment coefficient K, change-in-electromotive-force constant Kand polarization voltage generation constant Kto calculate the estimated charge/discharge electricity amount &#x394;Qas a function of the change &#x394;Vin the no-load voltage or the open circuit voltage over a predetermined period of time.

Method and device for estimating charge/discharge electricity amount of secondary cell

The present invention provides an apparatus for correcting a voltage of a secondary battery, wherein accuracy in measurement of battery voltages between battery blocks in different voltage measurement systems. In a battery ECU (), the following components are disposed: a first voltage measuring part (-), a second voltage measuring part (-), a third voltage measuring part (-) and a fourth voltage measuring part (-) which are disposed in different voltage measurement systems so as to measure voltages of plural battery blocks; a representative voltage calculating part () for calculating representative voltages from battery voltages measured by the first to fourth voltage measuring parts; a voltage correction value calculating part () for calculating voltage correction values on the basis of the respective representative voltages; and a correction value reflecting part () for adding the voltage correction values to measured voltages of battery blocks in the respective corresponding voltage measurement systems.

Method and apparatus for correcting voltage of secondary battery, and method and apparatus for estimating state of charge of secondary battery

There is provided a battery pack system with enhanced estimation accuracies of a polarization voltage and a remaining capacity of a secondary battery. A polarization voltage calculation sectioncalculates a polarization voltage Vpol from a filtered variation LPF (&#x394;Q) of an accumulated capacity with reference to a look-up table (LUT). An electromotive force calculation sectionsubtracts the polarization voltage Vpol from an effective no-load voltage V0to determine a battery electromotive force Veq. A remaining capacity estimation sectionestimates a remaining capacity SOC from the battery electromotive force Veq with reference to a look-up table (LUT)

Method for estimating polarization voltage of secondary cell, method and device for estimating remaining capacity of secondary cell, battery pack system, and vehicle

When a power switch portionis in an open state and a charge/discharge path of the secondary batteryis in a disconnected state, an electromotive force calculation portioncalculates a battery electromotive force Veq by subtracting a polarized voltage Vpol stored in a polarized voltage storage portionfrom an open-circuit voltage OCV measured by a voltage measurement portion. Based on the electromotive force, a state-of-charge estimation portionestimates a state of charge SOC. Thus, a polarized voltage to be considered for the estimation of SOC can be limited. The state of charge (SOC) of a secondary battery can be estimated with high accuracy and quickly.

Method and apparatus for estimating state of charge of secondary battery

There is provided a battery pack system with estimation accuracy of a remaining capacity of a secondary batter enhanced. A current accumulation coefficient correction sectioncalculates a correction amount &#x3b1; with respect to a current accumulation coefficient k in accordance with a battery electromotive force Veq from an electromotive force calculation section. A remaining capacity calculation sectionestimates a remaining capacity SOC by current accumulation, based on the current accumulation coefficient k calculated from a correction amount &#x3b1;, and a charging efficiency &#x3b7; based on a currently estimated remaining capacity calculated by a charging efficiency calculation section

Method and apparatus for estimating remaining capacity of secondary battery

There is provided a battery pack system that allows an output limit during short-time discharging and long-time discharging of a secondary battery, and limits the output appropriately upon request of a vehicle. An output limiting sectionis provided for changing a limit value of output electric power from the secondary battery when voltage data V (n) from a voltage measuring sectionreaches a predetermined discharging termination voltage. The output limiting sectionhas short-time output information (Pp) for allowing short-time discharging of the secondary battery and normal output information (Pn) for allowing long-time discharging of the secondary battery, and sets a first discharging termination voltage (V) during short-time discharging to be lower than a second discharging termination voltage (V) during long-time discharging.

Apparatus and method for controlling output of secondary battery, battery pack system, and electric vehicle

A method for activating a secondary battery is provided that enables sufficient activation of a secondary battery in a short time. A secondary battery is activated with a varying current, e.g., pulse current, in which current values in a charge direction and a discharge direction are repeated alternately in a cycle ranging from 1 to 30 seconds.

Method for activating secondary battery

A method of detecting and resolving a memory effect capable of detecting the memory effect with ease and with high precision and resolving even when the vehicle is in motion is provided. A current in a secondary battery is detected, a variation &Dgr;SOC in a residual battery capacity for a predetermined time period is calculated according to at least current integration by multiplying the detected current by a predetermined charge efficiency (S ), a temperature of the secondary battery is detected and a variation &Dgr;V in a no-load voltage for the predetermined time period is calculated based on the detected current, and an internal resistance corresponding to the detected temperature and the SOC is calculated (S ). A ratio k of the variation in the no-load voltage to the variation in the residual battery capacity is calculated (S ). If the ratio exceeds a predetermined threshold value kst, then the battery is judged to have a memory effect (S ), and the usage range of the SOC is extended for a predetermined time period (S ) or the correction of the SOC using voltages is prohibited for a predetermined time period(S ).

Method of detecting and resolving memory effect

A battery pack is formed by serially connecting a plurality of cells, that are individually constructed as rechargeable batteries. Charging and discharging of this battery pack are controlled such that, the proportion of discharge current with respect to the charge current equals to a value obtained by multiplying the charge current by a charging efficiency corresponding to a target SOC value.

Charging/discharging control method for secondary battery

A device and method of input/output control capable of exhibiting the battery performance by nature by rapidly raising the temperature of the secondary battery by the regeneration at a low temperature. A temperature rise controller controls the temperature rise of the battery pack based on the battery temperature, thereby determining a central value of the state-of-charge control in the range of the state of charge. A battery input/output controller voluntarily controls the state of charge based on the central value of the state-of-charge control from the temperature rise controller and the state of charge at the point of time from the state-of-charge operator, and controls charge and discharge based on the charge and discharge request from the outside to the battery pack.

Device and method for controlling input/output of secondary battery

A device and a method are provided in which memory effects can be cancelled by controlling charging and discharging of a secondary battery during driving of a vehicle. When a memory effect determinator determines that the discharging memory effect has occurred, based on at least one of the following determinations: whether a time of charging/discharging of a secondary battery has reached a predetermined time; whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and whether a voltage per cell has reached a voltage V at a lower-limit state of charge in a range of capacity actually used, a discharging controller discharges the secondary battery until the voltage per cell reaches a voltage V that is higher than 1.0 V and is lower than the voltage V at the lower-limit state of charge.

Charging/discharging control device and method for canceling memory effect in secondary battery

A device and method is provided that can detect overcharge reliably by separating heat generated by internal resistance and heat chemically generated upon overcharging in a secondary battery. Based on the temperature of the secondary battery detected every first predetermined time by a battery temperature detection section, a temperature gradient operation section calculates a temperature gradient indicating a temperature increase per unit time for every second predetermined time that is longer than the first predetermined time. When a temperature gradient determination section determines that the temperature gradient is larger than a predetermined temperature gradient threshold, which is preset according to the charged state of the secondary battery, N times in a row (where N is a natural number), a fully charged state of the secondary battery is detected.

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Hamamatsu, Japan

Yusai Murakami