BATTERY MODULE SYSTEM, METHOD OF CHARGING BATTERY MODULE AND CHARGING TYPE VACUUM CLEANER
First Claim
1. A battery module system comprising:
- a battery module comprising battery units are connected in series, each of the battery units comprising a unit cell having a voltage variation rate A (mV/% SOC) at a full charge voltage VH1 (V) is larger than 20 (mV/% SOC), which is a value obtained when the unit cell is charged at a current of 1 C at 25°
C.;
a current supply member which supplies current to the battery module;
a voltage detecting member which detects a voltage of the unit cells; and
a control member which controls the current to a current I1 until a maximum value Vmax (V) among the voltage of each unit cell reaches the full charge voltage VH1 (V) and then controls a voltage of the battery module to a voltage V2 (V) given by the following equation (1);
V2=VH2×
n
(1)where VH2 is a voltage lower than a voltage VM1 of the unit cell when the voltage variation rate A (mV/% SOC) reaches 20 (mV/% SOC) from less than 20 (mV/% SOC) and n denotes the number of battery units connected in series.
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Abstract
A battery module system includes a battery module and a control member. The battery module comprises battery units are connected in series. Each of the battery units comprises a unit cell having a voltage variation rate A (mV/% SOC) at a full charge voltage VH1 (V) is larger than 20 (mV/% SOC), which is a value obtained when the unit cell is charged at a current of 1 C at 25° C. The control member controls current to a current I1 until a maximum value Vmax (V) among the voltage of each unit cell reaches the full charge voltage VH1 (V) and then controls a voltage of the battery module to a voltage V2 (V) given by the following equation (1):
V2=VH2×n (1)
45 Citations
20 Claims
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1. A battery module system comprising:
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a battery module comprising battery units are connected in series, each of the battery units comprising a unit cell having a voltage variation rate A (mV/% SOC) at a full charge voltage VH1 (V) is larger than 20 (mV/% SOC), which is a value obtained when the unit cell is charged at a current of 1 C at 25°
C.;a current supply member which supplies current to the battery module; a voltage detecting member which detects a voltage of the unit cells; and a control member which controls the current to a current I1 until a maximum value Vmax (V) among the voltage of each unit cell reaches the full charge voltage VH1 (V) and then controls a voltage of the battery module to a voltage V2 (V) given by the following equation (1);
V2=VH2×
n
(1)where VH2 is a voltage lower than a voltage VM1 of the unit cell when the voltage variation rate A (mV/% SOC) reaches 20 (mV/% SOC) from less than 20 (mV/% SOC) and n denotes the number of battery units connected in series. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
where VH1 is the full charge voltage and n denotes the number of the battery units connected in series.
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4. The system according to claim 1, wherein the control member controls the current I1 such that a time taken until the SOC of the battery module reaches 80% from 0% is within 20 minutes.
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5. The system according to claim 4, wherein the current I1 is 5 C or more.
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6. The system according to claim 1, wherein the control member controls the voltage V2 such that the SOC of the battery module reaches 70 to 98%.
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7. The system according to claim 1, wherein each of the battery units comprises a plurality of the unit cell.
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8. The system according to claim 1, wherein the unit cell is a nonaqueous electrolyte secondary battery comprising a positive electrode, a separator and a negative electrode containing lithium-titanium oxide.
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9. The system according to claim 7, wherein the lithium-titanium oxide has a spinel structure.
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10. The system according to claim 7, wherein the negative electrode comprises a negative electrode current collector formed from aluminum having an average crystal grain size of 50 μ
- m or less or from an aluminum alloy having an average crystal grain size of 50 μ
m or less.
- m or less or from an aluminum alloy having an average crystal grain size of 50 μ
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11. The system according to claim 7, wherein the nonaqueous electrolyte secondary battery has a laminate structure in which the positive electrode and the negative electrode are alternately laminated while sandwiching the separator therebetween.
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12. The system according to claim 7, wherein the separator has a band shape and is folded in a zigzag shape and the positive electrode and the negative electrode are alternately inserted into the folded parts of the separator.
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13. A charging type vacuum cleaner comprising the battery module system according to claim 1.
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14. A method of charging a battery module comprising battery units are connected in series, each of battery units comprising a unit cell having a voltage variation rate A (mV/% SOC) at a full charge voltage VH1 (V) is larger than 20 (mV/% SOC), which is a value obtained when the unit cell is charged at a current of 1 C at 25°
- C., the method comprising;
a first constant-current charging at a current I1 until a maximum value Vmax (V) among the voltage of each unit cell reaches the full charge voltage VH1 (V); and a first constant-voltage charging which controls a voltage of the battery module to a voltage V2 given by the following equation (1)
V2=VH2×
n
(1)where VH2 is a voltage lower than a voltage VM1 of the unit cell when the voltage variation rate A (mV/% SOC) reaches 20 (mV/% SOC) from less than 20 (mV/% SOC) and n denotes the number of battery units connected in series. - View Dependent Claims (15, 16, 17, 18, 19, 20)
where VH1 is the full charge voltage and n denotes the number of the battery units connected in series.
- C., the method comprising;
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17. The method according to claim 14, wherein the current I1 is set such that a charging time taken until the SOC of the battery module reaches 80% from 0% is within 20 minutes.
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18. The method according to claim 14, wherein the voltage V2 is set such that the SOC of the battery module after the first constant-voltage charging reaches 70 to 98%.
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19. The method according to claim 14, wherein the unit cell is a nonaqueous electrolyte secondary battery comprising a positive electrode, a separator and a negative electrode containing lithium-titanium oxide.
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20. The method according to claim 19, wherein the lithium-titanium oxide has a spinel structure.
Specification