Rechargeable battery and method for controlling a rechargeable battery

Abstract

To provide a secondary battery that can suppress the occurrence of non-uniformity in the battery reaction. [Solution] The secondary battery comprises a positive electrode and a negative electrode, an outer casing housing the positive electrode and the negative electrode, a positive electrode tab portion electrically connected to the positive electrode and protruding from the outer casing, and a negative electrode tab portion electrically connected to the negative electrode and protruding from the outer casing, wherein the positive electrode tab portion comprises a first positive electrode tab protruding in a first direction and a second positive electrode tab protruding in a second direction opposite to the first direction, and the negative electrode tab portion comprises a first negative electrode tab protruding in the first direction and a second negative electrode tab protruding in the second direction.

Claims

1. Positive electrode and negative electrode, An outer casing housing the positive electrode and the negative electrode, A positive electrode tab portion is electrically connected to the positive electrode and protrudes from the outer casing, It comprises a negative electrode tab portion that is electrically connected to the negative electrode and protrudes from the outer casing, The positive electrode tab portion comprises a first positive electrode tab protruding in a first direction and a second positive electrode tab protruding in a second direction opposite to the first direction. The negative electrode tab portion comprises a first negative electrode tab protruding in the first direction and a second negative electrode tab protruding in the second direction, in a secondary battery.

2. In the secondary battery according to claim 1, A secondary battery in which the positive electrode and the negative electrode are stacked with a solid electrolyte layer in between.

3. In the secondary battery according to claim 1, The aforementioned negative electrode is a secondary battery containing lithium metal.

4. In the secondary battery according to claim 2 or claim 3, A secondary battery in which the direction in which the first negative electrode tab is positioned relative to the first positive electrode tab is the same as the direction in which the second negative electrode tab is positioned relative to the second positive electrode tab.

5. A method for controlling a secondary battery according to claim 1, A first battery processing step in which one of charging or discharging the secondary battery is performed as battery processing using a first tab combination consisting of the first positive electrode tab and the second negative electrode tab, A second battery processing step in which the battery processing is performed using a second tab combination consisting of the second positive electrode tab and the first negative electrode tab, A method for controlling a secondary battery, comprising: a first switching control step for switching between the first battery processing step and the second battery processing step.

6. In the secondary battery control method described in claim 5, The aforementioned battery processing is charging, The first switching control step is: If, during the execution of the first battery processing step or the second battery processing step, it is determined that the charge rate of the positive electrode tab end used for charging is higher than or equal to a first charge switching threshold than the charge rate of the positive electrode tab end not used for charging, a first charge switching process is performed to switch between the first battery processing step and the second battery processing step. A secondary battery control method that, if it is determined that the current charge level is not higher than the first charge switching threshold, does not perform the first charge switching process.

7. In the secondary battery control method described in claim 5, The aforementioned battery process is discharge, The first switching control step is: If, during the execution of the first or second battery processing step, it is determined that the charge level of the positive electrode tab end used for discharge is lower than or equal to a first discharge switching threshold than the charge level of the positive electrode tab end not used for discharge, a first discharge switching process is performed to switch between the first and second battery processing steps. A control method for a secondary battery, wherein if it is determined that the discharge switching process is not lower than or equal to the first discharge switching threshold, the first discharge switching process is not performed.

8. In the secondary battery control method described in claim 6, A third battery processing step in which charging is performed using a third tab combination consisting of the first positive electrode tab and the first negative electrode tab, and a fourth tab combination consisting of the second positive electrode tab and the second negative electrode tab, The method further includes a second switching control step for switching the first battery processing step or the second battery processing step to the third battery processing step, The second switching control step is: If, during the execution of the first or second battery processing step, it is determined that the central charge level of the secondary battery is higher than the charge levels of the first positive electrode tab end and the second positive electrode tab end, respectively, by a second charge switching process is performed to switch the currently executed first or second battery processing step to the third battery processing step. A method for controlling a secondary battery, wherein if it is determined that the value is not higher than the second charge switching threshold, the second charge switching process is not performed.

9. In the secondary battery control method according to claim 8, The third switching control step further includes switching the third battery processing step to the first battery processing step or the second battery processing step, The third switching control step is: During the execution of the third battery processing step, if it is determined that the difference between the charge level of the center and the charge levels of the first positive electrode tab end and the second positive electrode tab end is less than or equal to the third charge switching threshold, a third charge switching process is performed to switch the third battery processing step to the first battery processing step or the second battery processing step. A method for controlling a secondary battery, wherein if it is determined that the charge switching threshold is not below the third charge switching threshold, the third charge switching process is not performed.

10. In the secondary battery control method described in claim 5, A third battery processing step in which charging and discharging of the secondary battery is performed as battery processing using a third tab combination consisting of the first positive electrode tab and the first negative electrode tab, and a fourth tab combination consisting of the second positive electrode tab and the second negative electrode tab, A fourth battery processing step in which the battery processing is performed using the third tab combination, A fifth battery processing step in which the battery processing is performed using the fourth tab combination, A method for controlling a secondary battery, comprising: a fourth switching control step for switching between the third battery processing step and the fourth battery processing step or the fifth battery processing step.

11. In the secondary battery control method according to claim 10, The aforementioned battery processing is charging, The fourth switching control step is: During the execution of the third battery processing step, if it is determined that the charge level of one of the positive electrode tab ends of the first positive electrode tab and the second positive electrode tab is lower than the charge level of the other positive electrode tab end by a fourth charge switching threshold, a fourth charge switching process is performed to switch the third battery processing step to the fourth battery processing step or the fifth battery processing step which uses the positive electrode tab with the lower charge level among the first and second positive electrode tabs. A secondary battery control method that, if it is determined that the charge switching process is not lower than or equal to the fourth charge switching threshold, does not perform the fourth charge switching process.

12. In the secondary battery control method according to claim 11, The fourth switching control step is: During the execution of the fourth or fifth battery processing step, if it is determined that the difference between the central charge level of the secondary battery and the respective charge levels of the first positive electrode tab end and the second positive electrode tab end is less than or equal to a fifth charge switching threshold, a fifth charge switching process is performed to switch the fourth or fifth battery processing step back to the third battery processing step. A secondary battery control method that, if it is determined that the charge switching process is not below the fifth charge switching threshold, does not perform the fifth charge switching process.

13. In the secondary battery control method according to claim 10, The aforementioned battery process is discharge, The fourth switching control step is: During the execution of the third battery processing step, if it is determined that the charge level of one positive electrode tab end of the first positive electrode tab and the second positive electrode tab is higher than the charge level of the other positive electrode tab end by a second discharge switching threshold, a second discharge switching process is performed to switch the third battery processing step to the third battery processing step or the fourth battery processing step using the positive electrode tab with the higher charge level. A control method for a secondary battery, wherein if it is determined that the discharge switching process is not higher than the second discharge switching threshold, the second discharge switching process is not performed.

14. In the secondary battery control method described in claim 13, The fourth switching control step is: During the execution of the fourth or fifth battery processing step, if it is determined that the difference between the central charge level of the secondary battery and the respective charge levels of the first positive electrode tab end and the second positive electrode tab end is less than or equal to the third discharge switching threshold, a third discharge switching process is performed to switch the fourth or fifth battery processing step back to the third battery processing step. A control method for a secondary battery, wherein if it is determined that the discharge switching process is not below the third discharge switching threshold, the third discharge switching process is not performed.

15. A method for controlling a secondary battery according to any one of claims 6 to 9 and 11 to 14, The positive electrode and the negative electrode of the secondary battery are stacked with a solid electrolyte layer in between. The control method is a secondary battery control method that estimates the distribution of the charge rate based on the thickness or in-plane pressure distribution of the secondary battery.

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