Battery pack, method of charging secondary battery and battery charger
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01R-031/36
H02J-007/00
출원번호
US-0260801
(2008-10-29)
등록번호
US-9172261
(2015-10-27)
우선권정보
JP-2007-281764 (2007-10-30)
발명자
/ 주소
Suzuki, Isao
출원인 / 주소
Sony Corporation
대리인 / 주소
K&L Gates LLP
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A battery pack includes a secondary battery including a plurality of cell blocks, a measuring section, a charge and discharge control switch, a protection circuit, and a memory. The measuring section detects a voltage, a current, and an internal resistance, of the secondary battery. The controller m
A battery pack includes a secondary battery including a plurality of cell blocks, a measuring section, a charge and discharge control switch, a protection circuit, and a memory. The measuring section detects a voltage, a current, and an internal resistance, of the secondary battery. The controller monitors the voltage and the current of the secondary battery and outputs a request signal indicative of a charge condition to charge the secondary battery in accordance with the charge condition which is set. The protection circuit monitors voltages of the plurality of cell blocks. The memory registers an initial internal resistance of the secondary battery. The controller calculates a deterioration coefficient by a ratio of the internal resistance detected by the measuring section to the initial internal resistance registered in the memory, and changes the charge condition in accordance with the deterioration coefficient.
대표청구항▼
1. A battery pack comprising: a secondary battery including a plurality of cell blocks;a temperature detecting element configured to detect a temperature of each of the plurality of cell blocks;a measuring section configured to detect a voltage, a current, and an internal resistance, of the secondar
1. A battery pack comprising: a secondary battery including a plurality of cell blocks;a temperature detecting element configured to detect a temperature of each of the plurality of cell blocks;a measuring section configured to detect a voltage, a current, and an internal resistance, of the secondary battery;a controller configured to monitor the voltage and the current of the secondary battery and output a request signal indicative of a charge condition to charge the secondary battery in accordance with the charge condition which is set;a charge and discharge control switch configured to prevent overcharge and overdischarge;a protection circuit configured to monitor voltages of the plurality of cell blocks; anda memory which registers an initial internal resistance of the secondary battery based on a variation of initial internal resistance values for each of the cell blocks being within a predetermined range, wherein the initial internal resistance of the secondary battery is a resistance before an initial use of the secondary battery corresponding to the initial internal resistance values,wherein the controller obtains a maximum internal resistance among internal resistances of the plurality of cell blocks, calculates a deterioration coefficient by a ratio of the maximum internal resistance to the initial internal resistance of a cell block exhibiting the maximum internal resistance, and changes the charge condition in accordance with the deterioration coefficient, andwherein the charge condition includes a charging current value in constant-current charge, and a new charging current value is set to a value equal to an initial charging current multiplied by the deterioration coefficient. 2. The battery pack according to claim 1, wherein: the charge condition includes a charging voltage value, andthe charging voltage value is changed depending upon the deterioration coefficient. 3. The battery pack according to claim 1, wherein the initial internal resistance is measured within a predetermined time period after manufacturing. 4. The battery pack according to claim 1, wherein: the charge and discharge control switch is composed of a charge control FET and a discharge control FET, andin a normal charge and discharge operation,a control signal is set at a low level to turn the charge control FET and the discharge control FET on-state. 5. The battery pack according to claim 4, wherein: when a battery voltage becomes an overcharge detection voltage, the charge and discharge control switch is controlled to turn the charge control FET off so that a charging current does not flow, andwhen the battery voltage becomes an overdischarge detection voltage, the charge and discharge control switch is controlled to turn the discharge control FET off so that a discharging current does not flow. 6. The battery pack according to claim 1, wherein: when a cell voltage of the cell blocks exceeds a charge inhibiting voltage, the protection circuit melts a fuse connected to the protection circuit to become a permanent failure mode. 7. The battery pack according to claim 1, wherein: the memory is included in a CPU, andthe CPU measures a magnitude and a direction of a current by using a current detection resister, and captures a battery temperature measured by a temperature detection element. 8. The battery pack according to claim 1, wherein the measuring section detects an initial voltage of each of the plurality of cell blocks, and the temperature detecting element detects an initial temperature of each of the plurality of cell blocks. 9. The battery pack according to claim 8, wherein the measuring section calculates an initial internal resistance of each of the plurality of cell blocks based on an initial current of the secondary battery, an initial voltage of a respective cell block, and an initial temperature of the respective cell block. 10. The battery pack according to claim 9, wherein the memory registers an initial internal resistance of each of the plurality of cell blocks. 11. The battery pack according to claim 1, wherein the measuring section detects a voltage of each of the plurality of cell blocks during charging, and the temperature detecting element detects a temperature of each of the plurality of cell blocks during charging. 12. The battery pack according to claim 11, wherein the measuring section calculates an internal resistance of each of the plurality of cell blocks during charging based on a current of the secondary battery during charging, a voltage of a respective cell block during charging, and a temperature of the respective cell block during charging. 13. The battery pack according to claim 1, wherein the initial charging current is an initial setting of the constant-current charge. 14. A method of charging a secondary battery including a plurality of cell blocks, comprising: detecting a temperature of each of the plurality of cell blocks;detecting a voltage, a current, and an internal resistance, of the secondary battery; andmonitoring the voltage and the current of the secondary battery and outputting a request signal indicative of a charge condition to charge the secondary battery in accordance with the charge condition which is set,wherein, in the step of outputting the request signal,a deterioration coefficient is calculated by a ratio of a maximum internal resistance among internal resistances of the plurality of cell blocks detected during charging to an initial internal resistance of a cell block exhibiting the maximum internal resistance registered in a memory based on a variation of initial internal resistance values for each of the cell blocks being within a predetermined range, and the charge condition is changed depending upon the deterioration coefficient,wherein the initial internal resistance of the secondary battery is a resistance before an initial use of the secondary battery,wherein the charge condition includes a charging current value in constant-current charge, and a new charging current value is set to a value equal to an initial charging current multiplied by the deterioration coefficient. 15. The method of charging a secondary battery according to claim 14, wherein: the charge condition includes a charging voltage value, andthe charging voltage value is changed depending upon the deterioration coefficient. 16. The method of charging a secondary battery according to claim 14, wherein the initial internal resistance is measured within a predetermined time period after manufacturing. 17. The method of charging a secondary battery according to claim 14, wherein: the secondary battery includes a plurality of cell blocks, anda controller calculates the deterioration coefficient by a ratio of a maximum internal resistance among the plurality of cell blocks during charging to the initial internal resistance of a cell block exhibiting the maximum internal resistance. 18. A battery charger comprising: a secondary battery including a plurality of cell blocks;a temperature detecting element configured to detect a temperature of each of the plurality of cell blocks;a measuring section configured to detect a voltage, a current, and an internal resistance, of the secondary battery;a controller configured to monitor the voltage and the current of the secondary battery and output a request signal indicative of a charge condition to charge the secondary battery in accordance with the charge condition which is set;a memory which registers an initial internal resistance of the secondary battery based on a variation of initial internal resistance values for each of the cell blocks being within a predetermined range, wherein the initial internal resistance of the secondary battery is a resistance before an initial use of the secondary battery; anda charge controller configured to control outputs of the charging current and the charging voltage of the secondary battery in accordance with the request signal outputted from the controller,wherein the controller obtains a maximum internal resistance among internal resistances of the plurality of cell blocks, calculates a deterioration coefficient by a ratio of the maximum internal resistance to the initial internal resistance of a cell block exhibiting the maximum internal resistance, and changes the charge condition in accordance with the deterioration coefficient, andwherein the charge condition includes a charging current value in constant-current charge, and a new charging current value is set to a value equal to an initial charging current multiplied by the deterioration coefficient. 19. The battery charger according to claim 18, wherein: the charge condition includes a charging voltage value, andthe charging voltage value is changed depending upon the deterioration coefficient. 20. The battery charger according to claim 18, wherein the initial internal resistance is measured within a predetermined time period after manufacturing.
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이 특허에 인용된 특허 (4)
Ito Hironori,JPX ; Sekine Shigeru,JPX ; Kasashima Masahiko,JPX ; Tsukazawa Hisao,JPX ; Hino Yuichiro,JPX ; Morioka Shizuo,JPX ; Hosoya Nobuyuki,JPX ; Ukiya Yoshiaki,JPX ; Ozawa Katsuo,JPX ; Motomiya , Battery set structure and charge/discharge control apparatus for lithium-ion battery.
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