Control apparatus, control method, and program
A control apparatus ( 2000 ) includes a control unit ( 2020 ). The control unit ( 2020 ) causes a charging apparatus ( 20 ) to perform charging of a lithium ion secondary battery ( 10 ), by controlling the charging apparatus ( 20 ). First, the control unit ( 2020 ) causes the charging apparatus ( 20 ) to perform the charging of the lithium ion secondary battery ( 10 ), until a voltage of the lithium ion secondary battery ( 10 ) becomes a predetermined voltage. Thereafter, the control unit ( 2020 ) causes the charging apparatus ( 2 ) to suspend the charging of the lithium ion secondary battery ( 10 ), until a predetermined time elapses. Therefore, the control unit ( 2020 ) causes the charging apparatus ( 20 ) to further perform the charging of the lithium ion secondary battery ( 10 ), after the suspending. The predetermined time is a time t [minute] that satisfies “t≥−A+B*x+C*y.” x[g/cm 2 ] represents weight per unit area of a negative electrode of the lithium ion secondary battery ( 10 ). y [g/cm 3 ] is density of the negative electrode. A is a constant that is equal to or more than 50 and equal to or less than 70. B is a constant that is equal to or more than 500 and equal to or less than 620. C is a constant that is equal to or more than 30 and equal to or less than 36.
1. A control apparatus comprising:
a control unit that controls a charging apparatus which performs charging of a lithium ion secondary battery,
wherein the control unit performs:
causing the charging apparatus to perform the charging of the lithium ion secondary battery, until a voltage of the lithium ion secondary battery becomes a predetermined voltage;
causing the charging apparatus to suspend the charging of the lithium ion secondary battery, until a predetermined time t elapses, after the charging; and
causing the charging apparatus to further perform the charging of the lithium ion secondary battery, after the suspending, and
the predetermined time t [minute] satisfies a condition that is determined by Expression (1) using weight per unit area x [g/cm2] of a negative electrode of the lithium ion secondary battery and density y [g/cm3] of the negative electrode
Expression 1
t≥−A+B*x+C*y 50≤ A≤ 70,500≤ B≤ 620,30≤ C≤ 36 (1).
2. The control apparatus according to claim 1 , wherein the predetermined voltage is a voltage in which a state of charge of the lithium ion secondary battery is equal to or more than 70% and equal to or less than 100% in a case where the lithium ion secondary battery is charged at a charging rate of 0.2 C.
3. A control method comprising:
causing a charging apparatus that performs charging of a lithium ion secondary battery to perform the charging of the lithium ion secondary battery, until a voltage of the lithium ion secondary battery becomes a predetermined voltage;
causing the charging apparatus to suspend the charging of the lithium ion secondary battery, until a predetermined time t elapses, after the charging; and
causing the charging apparatus to further perform the charging of the lithium ion secondary battery, after the suspending, wherein the predetermined time t [minute] satisfies a condition that is determined by Expression (2) using weight per unit area x [g/cm2] of a negative electrode of the lithium ion secondary battery and density y [g/cm3] of the negative electrode
Expression 2
t≥−A+B*x+C*y 50≤ A≤ 70,500≤ B≤ 620,30≤ C≤ 36 (2).
4. The control method according to claim 3 , wherein the predetermined voltage is a voltage in which a state of charge of the lithium ion secondary battery is equal to or more than 70% and equal to or less than 100% in a case where the lithium ion secondary battery is charged at a charging rate of 0.2 C.
5. A non-transitory computer-readable storage medium storing a program causing a computer to execute each step of the control method according to claim 3 .