WO2021155539A1 - Procédé de charge, dispositif électronique et support de stockage - Google Patents

Procédé de charge, dispositif électronique et support de stockage Download PDF

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Publication number
WO2021155539A1
WO2021155539A1 PCT/CN2020/074435 CN2020074435W WO2021155539A1 WO 2021155539 A1 WO2021155539 A1 WO 2021155539A1 CN 2020074435 W CN2020074435 W CN 2020074435W WO 2021155539 A1 WO2021155539 A1 WO 2021155539A1
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Prior art keywords
charging
battery
soc
charge
state
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PCT/CN2020/074435
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English (en)
Chinese (zh)
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关婷
朱珊
吴飞
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宁德新能源科技有限公司
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Priority to CN202080009112.7A priority Critical patent/CN113424391A/zh
Priority to PCT/CN2020/074435 priority patent/WO2021155539A1/fr
Publication of WO2021155539A1 publication Critical patent/WO2021155539A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • This application relates to the field of battery technology, and in particular to a method for charging a battery, an electronic device, and a storage medium.
  • the constant current charging cut-off voltage (ie, constant voltage charging voltage) is set in advance, but with the development of charging technology, in some charging methods, it may appear that the current battery voltage is not equal to the preset The voltage in the process of constant voltage charging, but the situation of constant voltage charging is still required. For example, first charge with a constant current to the pre-set state of charge, then dynamically obtain the voltage in the state of charge, and then perform constant voltage charging with the voltage. However, if the state of charge is dynamically obtained during the charging process to be greater than the pre-set state of charge, it will not be possible to obtain an accurate voltage for constant voltage charging.
  • the impedance of the battery will increase, which will shorten the constant current charging time of the battery and extend the constant voltage charging time, which will eventually lead to the longer and longer total charging time of the battery.
  • An embodiment of the present application provides a method for charging a battery.
  • the charging method includes: establishing a corresponding relationship between a first state of charge and a charging mode, where the first state of charge includes N intervals in sequence; In m charge-discharge cycles, the second state of charge of the battery before charging is obtained, m is an integer and m ⁇ 1; according to the magnitude of the second state of charge, it is determined that the second state of charge falls on the The i-th interval in the N intervals, i is an integer and 1 ⁇ i ⁇ N; and the battery is charged by the charging method corresponding to the i-th interval and the interval after the i-th interval Charge it.
  • the charging method includes N charging sub-phases corresponding to the N intervals, and each charging sub-phase includes j constant current phases and constant voltage phases, each of the constant current The phase and the constant voltage phase stop charging in the state of charge, where N and j are integers, and N ⁇ 1, j ⁇ 1.
  • mr1 , I mr2 , ..., I mrj respectively charge the battery to the corresponding state of charge SOC mr1 , SOC mr2 , ..., SOC mrj ; and obtain the corresponding information when the battery is charged to the state of charge SOC mrj
  • the voltage V mrj charges the battery to the state of charge SOC mr according to the voltage V mrj.
  • the SOC mr1 , ..., SOC mrj, and SOC mr are the battery or another battery that is the same as the battery corresponding to the rth charging substage in the nth charge and discharge cycle
  • n is an integer greater than or equal to 0
  • m is an integer greater than n.
  • the charging method includes N charging sub-phases corresponding to the N intervals, and each charging sub-phase includes j alternating constant current phases and constant voltage phases.
  • charging is stopped in a state of charge, where N and j are integers, and N ⁇ 1, j ⁇ 1.
  • the SOC mk1 , SOC mk2 , ..., SOC mkj correspond to the kth charging substage in the nth charge and discharge cycle of the battery or another battery that is the same as the battery SOC mk10 , SOC mk20 , ..., SOC mkj0 is the battery or another battery that is the same as the battery at the nth time
  • the state of charge or the preset value when the constant current charging is cut off in each charging sub-stage corresponding to the k-th charging sub-stage in the charge-discharge cycle, n is an integer greater than or equal to 0, and m is an integer greater than n.
  • the charging capacity of each charging sub-phase is equal to the difference between the state of charge at the beginning of the next charging sub-phase and the state of charge at the end of the previous charging sub-phase Multiply by the capacity Q, which is the actual capacity of the battery.
  • An embodiment of the present application provides an electronic device.
  • the electronic device includes a battery and a processor, and the processor is configured to execute the charging method described above.
  • An embodiment of the present application provides a storage medium on which at least one computer instruction is stored, and the computer instruction is loaded by a processor and used to execute the battery charging method described above.
  • the embodiment of this application records the charging method and state of charge of the battery.
  • the corresponding charging method can be inquired according to the current state of charge of the battery, and then the battery is charged according to the inquired charging method.
  • the full charge time of the battery can be shortened.
  • selecting an appropriate charging method to charge the battery according to the current state of charge can greatly improve the charging of the battery. Speed and ensure that the battery does not overcharge.
  • FIG. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
  • Fig. 2 is a flowchart of a battery charging method according to an embodiment of the present application.
  • Fig. 3 is a block diagram of a charging system according to an embodiment of the present application.
  • the charging system 10 runs in the electronic device 1.
  • the electronic device 1 includes, but is not limited to, at least one processor 11 and a battery 12.
  • the above-mentioned components may be connected via a bus or directly.
  • FIG. 1 is only an example of the electronic device 1.
  • the electronic device 1 may also include more or fewer elements, or have different element configurations.
  • the electronic device 1 may be an electric motorcycle, an electric bicycle, an electric car, a mobile phone, a tablet computer, a digital assistant, a personal computer, or any other suitable rechargeable equipment.
  • the battery 12 is a rechargeable battery for providing electrical energy to the electronic device 1.
  • the battery 12 may be a lithium ion battery, a lithium polymer battery, a lithium iron phosphate battery, or the like.
  • the battery 12 includes at least one battery cell, and the battery 12 can be recharged repeatedly in a rechargeable manner.
  • the electronic device 1 may also include other components such as a wireless fidelity (Wireless Fidelity, WiFi) unit, a Bluetooth unit, a speaker, etc., which will not be repeated here.
  • a wireless fidelity (Wireless Fidelity, WiFi) unit Wireless Fidelity, WiFi
  • a Bluetooth unit Bluetooth unit
  • speaker etc., which will not be repeated here.
  • FIG. 2 is a flowchart of a battery charging method according to an embodiment of the present application.
  • the battery charging method may include the following steps:
  • Step S21 Establish a corresponding relationship between a first state of charge and a charging mode, where the first state of charge includes N intervals in sequence.
  • State of Charge refers to the ratio of the remaining capacity of the battery to the full charge capacity of the battery.
  • the corresponding relationship between the first state of charge and the charging mode is established in advance, so that in the subsequent use process, the state of charge of the battery before charging is first obtained, and then the corresponding relationship is obtained by querying the corresponding relationship according to the state of charge.
  • the charging method is used to charge the battery according to the charging method.
  • the charging method includes N charging sub-phases corresponding to the N intervals, and each charging sub-phase includes j constant current phases and one constant voltage phase.
  • the constant current phase and the constant voltage phase stop charging in the state of charge, where N, j are integers and N ⁇ 1, j ⁇ 1.
  • each charging sub-phase includes j constant current phases and one constant voltage phase
  • stopping charging in each of the constant current phases and the constant voltage phases in the state of charge includes:
  • n represents the m-th charge and discharge cycle of the battery, and m is an integer and m ⁇ 1.
  • the charging system 10 performs constant current charging on the battery 12 according to j constant currents I mr1 , I mr2 , ..., I mrj, respectively, and then Obtain the voltage V mrj of the battery 12 when the constant current charging is cut off (that is, when the battery is charged with constant current I mrj is cut off), and finally charge the battery to the state of charge SOC mr according to the voltage V mrj .
  • the state of charge SOC mr is the state of charge when the constant voltage phase is cut off.
  • the state of charge SOC mr reaches 100% (there may be an error, such as within 1%, depending on specific requirements), confirm that the battery 12 is fully charged; when the state of charge SOC mr does not reach 100% ( If there may be an error, such as within 1%, it may be determined according to specific requirements), continue to charge the battery 12 in a charging mode including j constant current stages and one constant voltage stage.
  • the charging system 10 may use three sequential constant currents I m11 , I m12 , and I m13 to charge the battery with constant current to the battery.
  • the state of charge SOC m11, SOC m12, SOC m13 i.e., the charging system 10 to a constant current I m11 after the battery 12 to charge SOC m11, and then at a constant current of the battery 12 I m12 M12 to charge SOC, and then constant current I m13 to charge the battery 12 SOC M13, acquiring the battery 12 is charged to a state of charge SOC when the voltage V m13 m13, then the voltage on the V m13 The battery 12 is charged at a constant voltage until the state of charge is SOC m1 . Then, in the second charging sub-phase (i.e.
  • the charging system 10 may use three sequential constant currents I m21 , I m22 , and I m23 to charge the battery with constant current to the battery.
  • the state of charge is SOC m21 , SOC m22 , and SOC m23 , and the voltage V m23 when the battery 12 is charged to the state of charge of SOC m23 is obtained, and then the battery 12 is charged at a constant voltage with the voltage V m23 to The state of charge is SOC m2 .
  • SOC m2 When the state of charge SOC m2 reaches 100% (there may be an error, such as within 1%, which may be determined according to specific requirements), it is confirmed that the battery 12 is fully charged.
  • N and j take other values, it can be deduced by analogy.
  • the SOC mr1 , ..., SOC mrj are the state of charge of the battery at the end of each constant current charge corresponding to the rth charging substage in the nth charge and discharge cycle, and n is greater than An integer equal to 0, and m is an integer greater than n.
  • the SOC mr is the state of charge of the battery when the constant voltage charging corresponding to the rth charging substage in the nth charging and discharging cycle is cut off.
  • SOC m11 ,..., SOC m1j are the state of charge (ie SOC n11 , ..., SOC n1j in order ), SOC m1 is the state of charge (that is, SOC n1 ) of the battery at the end of the constant voltage charging corresponding to the first charging sub-phase in the first charge and discharge cycle;
  • SOC m21 ,..., SOC m2j are the charges when the respective constant current charging is cut off in the second charging sub-phase of the battery in the first charge-discharge cycle State (that is, SOC n21 , ..., SOC n2j in sequence ), SOC m2 is the state of charge at the end of the constant voltage charge corresponding to the second charging sub-stage of the battery in the first charge and discharge cycle (that is, SOC n2 ).
  • N, n, and m take other values, the analogy can be applied.
  • the SOC mr1 , ..., SOC mrj are the charges of another battery that is the same as the battery at the end of each constant current charging corresponding to the rth charging substage in the nth charging and discharging cycle. Electric state.
  • the SOC mr is the state of charge of another battery that is the same as the battery when the constant voltage charging is cut off corresponding to the rth charging substage in the nth charging and discharging cycle.
  • the SOC mr1 ,..., SOC mrj, and SOC mr may be preset values.
  • the charging method includes N charging sub-phases corresponding to the N intervals, and each charging sub-phase includes j alternating constant current phases and constant voltage phases.
  • the constant current phase and the constant voltage phase stop charging in the state of charge, where N, j are integers and N ⁇ 1, j ⁇ 1.
  • V mkj to a corresponding constant current I mk1, I mk2, ..., I mkj were charged to the battery state of charge SOC mk10, SOC mk20, ..., SOC when the cut-off voltage mkj0.
  • the charging system 10 charges the battery to the state of charge SOC mk1 according to the first set of current and voltage [I mk1 , V mk1 ], and then uses the second set of Current and voltage [I mk2 , V mk2 ] charge the battery to the state of charge SOC mk2 , ..., and finally charge the battery to the state of charge SOC mkj with the j-th group of current and voltage [I mkj , V mkj] .
  • each set of voltage is the voltage when each set of corresponding current is used to charge the battery to the corresponding state of charge, and then the battery is charged with constant voltage at this voltage, where V mk1 ⁇ V mk2 ⁇ ... ⁇ V mkj .
  • the charging system charges the battery 10 to a constant state of charge SOC mk10
  • the voltage V mk1 charges the battery at a constant voltage to the state of charge SOC mk1 when the battery is cut off; then the battery is charged to the state of charge SOC mk20 at a constant current according to the current I mk2 to obtain the cut-off voltage V mk2 corresponding to SOC mk20 , Next to the charge off voltage V mk2 constant voltage to the battery state of charge in the off SOC mk2; and so on, the constant current charge to the battery state of charge SOC mkj0 the current I mkj, corresponding to the acquired SOC mkj0
  • the cut-off voltage V mkj of and then charge the battery at a constant voltage with the cut-off voltage V mkj to the
  • the charging system 10 may use 3 sets of constant currents and voltages [I m11 , V m11 ], [I m12 , V m12 ], [I m13 , V m13 ] respectively charge the battery to the corresponding state of charge SOC m11 , SOC m12 , SOC m13 , where V m11 , V m12 , and V m13 are respectively constant currents I m11 , I m12 , I m13
  • the charging system 10 first charges the battery 12 to SOC m110 with a constant current I m11 , obtains the voltage V m11 when the state of charge is SOC m110 , and then charges the battery 12 with a constant voltage V m11 To SOC m11 ; and then charge the battery 12 to SOC m120 with a constant current I m12 , obtain the voltage V m12 when the state of charge is SOC m120 , and then charge the battery 12 to SOC with a constant voltage V m12 M12; then I m13 constant current after the battery 12 to charge SOC M130, obtaining state of charge SOC when the voltage V m13 m130, and then at a constant voltage V m13 to charge the battery 12 SOC m13.
  • the charging system 10 can use 3 sets of constant current and voltage [I m21 , V m21 ], [I m22 , V m22 ], [ I m23 , V m23 ] respectively charge the battery to the corresponding state of charge SOC m21 , SOC m22 , SOC m23 , where V m21 , V m22 , and V m23 are pairs of constant currents I m21 , I m22 , and I m23 respectively The cut-off voltage when the battery is charged to the state of charge SOC m210 , SOC m220 , SOC m230 at constant current.
  • the charging system 10 first charges the battery 12 to SOC m210 with a constant current I m21 , obtains the voltage V m21 when the state of charge is SOC m210 , and then charges the battery 12 with a constant voltage V m21.
  • the SOC mk1 , SOC mk2 , ..., SOC mkj are the values when the constant voltage charging is cut off in each charging sub-phase corresponding to the k-th charging sub-phase in the n-th charging and discharging cycle. State of charge. Wherein, n is an integer greater than or equal to 0, and m is an integer greater than n.
  • SOC m11 , SOC m12 , ..., SOC m1j are the constant voltage charging cut-offs in the respective charging sub-phases corresponding to the first charging sub-phase in the first charging and discharging cycle of the battery SOC n11 ,..., SOC n1j in sequence at time (that is, SOC n11, ..., SOC n1j );
  • SOC m21 , SOC m22 , ..., SOC m2j are the batteries in the first time
  • the SOC mk1 , SOC mk2 , ..., SOC mkj are the charging sub-stages corresponding to the k-th charging sub-stage in the n-th charging and discharging cycle of another battery that is the same as the battery.
  • n is an integer greater than or equal to
  • m is an integer greater than n. It should be noted that when n is 0, the minimum value of m is 1.
  • the SOC mk1 , SOC mk2 , ..., SOC mkj are preset values.
  • the SOC mk10 , SOC mk20 , ..., SOC mkj0 are each of the battery or another battery that is the same as the battery in the nth charge and discharge cycle corresponding to the kth charging substage.
  • n is an integer greater than or equal to 0
  • m is an integer greater than n.
  • SOC m110 , SOC m120 , ..., SOC m1j0 are the constant current charging cutoffs in each charging sub-phase corresponding to the first charging sub-phase in the first charging and discharging cycle of the battery SOC n110 , SOC n120 , ..., SOC n1j0 at the time of the battery ;
  • SOC m210 , SOC m220 , ..., SOC m2j0 are the first charge-discharge cycle in the second stage of the electronic charge corresponding to the respective stages of the electronic charge constant current charging when the state of charge oFF (i.e., the order of SOC n
  • Step S22 In the m-th charge and discharge cycle, obtain the second state of charge of the battery before charging, where m is an integer and m ⁇ 1.
  • the charging mode in the subsequent charging process is determined according to the second state of charge.
  • Step S23 Determine according to the magnitude of the second state of charge that the second state of charge falls in the i-th interval of the N intervals, where i is an integer and 1 ⁇ i ⁇ N.
  • the pre-established correspondence is inquired according to the second state of charge to determine which interval of the N intervals the second state of charge falls within.
  • Step S24 Charge the battery using the charging method corresponding to the i-th interval and the interval after the i-th interval.
  • the battery when the second state of charge falls in the i-th interval among the N intervals, the battery is charged according to the charging method in the established correspondence relationship.
  • the charging method in the established correspondence relationship.
  • the second state of charge falls in the constant voltage charging phase in the charging mode corresponding to the i-th interval among the N intervals, it is obtained that the battery is charged at the m-1th time.
  • the voltage or the preset value of the constant voltage charging stage in the charging mode corresponding to the i-th interval in the discharge cycle; and the constant voltage charging of the battery is performed according to the obtained voltage.
  • the corresponding relationship includes the charging current, the charging voltage, the state of charge SOC when each charging stage is turned off, and the mapping relationship between them in the constant voltage charging stage and the constant current charging stage corresponding to each interval.
  • the charging capacity of each charging sub-phase is equal to the difference between the state of charge at the beginning of the next charging sub-phase and the state of charge at the end of the previous charging sub-phase multiplied by the capacity Q, Q are the actual capacity of the battery 12.
  • the charging system 10 is also used to obtain the discharge capacity or the current actual capacity of the battery 12 in each charge and discharge cycle.
  • the actual capacity of the battery 12 in each charge and discharge cycle is the actual battery capacity of the battery 12 in the corresponding charge and discharge cycle, that is, the battery 12 will
  • the battery 12 is discharged from the fully charged state to the maximum capacity of the fully discharged state, and the discharge capacity can be measured by a fuel gauge.
  • the fully discharged state is that after the battery is discharged, the power in the battery is zero.
  • the fully discharged state may be that the battery is discharged to a preset power level or a preset voltage.
  • the charging system 10 obtains the actual capacity of the battery 12 in each charge and discharge cycle, and records the temperature and rate of the battery, etc., according to the known correspondence between different temperatures and different rates of capacity, the battery The actual capacity of the battery 12 is converted and calculated, and then the actual charging temperature of the battery 12 and the maximum capacity at the charging rate are obtained. This maximum capacity is the actual capacity mentioned above.
  • the actual capacity of the battery 12 will change with the increase in the use time of the battery 12 or the number of charge and discharge cycles, and the actual capacity of the battery has a direct relationship with the aging of the battery cell.
  • the charging system 10 can obtain the actual capacity of the battery 12 in each charge and discharge cycle.
  • this application records the charging mode and state of charge of the battery.
  • the corresponding charging mode can be inquired according to the current state of charge of the battery, and then the battery can be charged according to the inquired charging mode. Therefore, when the battery directly enters the constant voltage charging during the charging process without the constant voltage charging voltage set in advance, the charging of the battery 12 can be greatly improved by selecting an appropriate charging method according to the current state of charge. Speed and ensure that the battery does not overcharge.
  • the battery system used in each comparative example and each embodiment of this application uses LiCoO 2 as the cathode, graphite as the anode, plus a diaphragm, electrolyte and packaging shell, through mixing, coating, assembling, forming and aging processes production.
  • Part of the battery cell is wound with a reference electrode between the cathode and anode pole pieces to make a three-electrode battery, which is used to test the difference between the cathode potential and the anode potential of the battery during the charging process.
  • the comparative examples and embodiments of this application can also use batteries of other chemical systems, that is, using other materials as cathode materials, such as lithium manganate, lithium iron phosphate, ternary materials, etc. This is limited.
  • the charging limit voltage of the battery in each comparative example and each embodiment of the present application is 4.45V as an example.
  • the charging method of the present application can be applied to batteries of various voltage systems, and is not limited to the 4.45V system.
  • Comparative Example 1 discloses a specific implementation process of using fresh batteries to perform the charging method of the prior art (that is, the constant current charging stage is cut off at a fixed voltage).
  • Step 1 Use a constant current of 1.0C to charge the battery until the battery voltage reaches the cut-off voltage of 4.2V;
  • Step 2 Continue to charge the battery with a constant voltage of 4.2V until the battery current reaches the cut-off current 0.5C;
  • Step 3 Use a constant current of 0.5C to charge the battery until the battery voltage reaches the cut-off voltage of 4.45V (can be understood as the charging limit voltage);
  • Step 4 Continue to use a constant voltage of 4.45V to charge the battery until the battery current reaches the cut-off current 0.025C;
  • Step 5 Let the battery stand for 5 minutes
  • Step 6 Use a constant current of 0.7C to discharge the battery until the battery voltage is 3.0V;
  • Step 7 Then let the battery stand for 5 minutes
  • Step 8 Repeat the above steps 1 to 7 for 500 cycles.
  • Embodiments 1 to 2 are for charging the battery using the charging method in the embodiment of the present invention. It should be noted that Embodiments 1 to 2 disclose the specific implementation process of using fresh batteries to obtain corresponding parameters and charging the fresh batteries according to the charging method of this application. At the same time, the environmental temperature and the Ratio 1 is the same and remains the same.
  • the fresh battery refers to a battery that has not been used just after leaving the factory, or a battery whose number of charge and discharge cycles after leaving the factory is less than a preset number (such as 10 times, or other times).
  • Step 1 Use a constant current of 0.7C to discharge the battery until the battery voltage is 3.0V;
  • Step 2 Let the battery stand for 5 minutes
  • Step 3 Use a constant current of 1.0C to charge the battery until the battery voltage reaches the cut-off voltage of 4.2V;
  • Step 4 Continue to charge the battery with a constant voltage of 4.2V until the battery current reaches the cut-off current 0.5C;
  • Step 5 Use a constant current of 0.5C to charge the battery until the battery voltage reaches the cut-off voltage of 4.45V (can be understood as the charging limit voltage);
  • Step 6 Continue to charge the battery with a constant voltage of 4.45V until the battery current reaches the cut-off current 0.025C;
  • Step 2 Use a constant voltage of 4.2V to charge the battery at a constant voltage until the state of charge of the battery is 66.3%;
  • Step 3 Use a constant current of 0.5C to charge the battery until the SOC of the battery reaches 85.9%;
  • Step 4 Obtain the voltage (V 2 ) at which the constant current charging is cut off in Step 3;
  • Step 5 Perform constant voltage charging on the battery under the constant current charging cut-off voltage (V 2 ) of step 4 until the SOC of the battery reaches 100%.
  • V 2 constant current charging cut-off voltage
  • Step 6 Let the battery stand for 5 minutes
  • Step 7 Use a constant current of 0.7C to discharge the battery until the battery voltage is xV (x ⁇ the lowest voltage value of discharge);
  • Step 8 Calculate the actual capacity Q of the battery according to step 7 to be used as the capacity Q in the next charging cycle
  • Step 9 Repeat the above steps 1 to 8 for 500 cycles.
  • SOC 1 , SOC 2 , and SOC 3 The parameter acquisition process of SOC 1 , SOC 2 , and SOC 3 is the same as that of Example 1, except for the specific values of actual SOC 1 , SOC 2 , and SOC 3.
  • the specific actual SOC values are shown in Table 2:
  • the charging process is the same as in the first embodiment, except that the SOC 1 , SOC 2 , and SOC 3 set in the second embodiment are used.
  • Comparative Example 2 discloses a specific implementation process of the prior art charging method using a battery that has been charged and discharged for 100 cycles.
  • the charging process is the same as that of Comparative Example 1, except that a battery that has been charged and discharged for 100 cycles is used to perform the charging process of Comparative Example 1.
  • Embodiments 3 to 5 disclose that a battery that has been charged and discharged for 100 cycles is used to perform the specific implementation process of the charging method described in this application.
  • the third embodiment discloses the use of fresh batteries to obtain the corresponding charging parameters.
  • the charging process is the same as in Example 1, except that a battery that has been charged and discharged for 100 cycles is used for charging.
  • the fourth embodiment discloses the use of fresh batteries to obtain the corresponding charging parameters.
  • SOC 1 , SOC 2 , and SOC 3 are the same as those of embodiment 2;
  • the charging process is the same as in Example 2, except that a battery that has been charged and discharged for 100 cycles is used for charging.
  • the embodiment 5 discloses that a battery that has been charged and discharged for 100 cycles is used to obtain the corresponding charging parameters.
  • the parameter acquisition process of SOC 1 , SOC 2 , SOC 3 is the same as that of embodiment 2, except that the battery that has been cycled 100 times is used to obtain the parameters SOC 1 , SOC 2 , SOC 3 , and the specific SOC 1 , SOC 2 , SOC
  • Table 3 The value of 3 is shown in Table 3 below:
  • the charging process is the same as the charging process in embodiment 1, except that a battery that has been cycled 100 times is used for charging, and the SOC 1 , SOC 2 , and SOC 3 set in embodiment 5 are used.
  • Table 5 The charging time of each comparative example and each constant current and constant voltage stage in Examples 1-5
  • Example 1 and Example 2 can extend the charging time of the constant current stage by using the charging method provided by this application, and greatly reduce the charging time of the constant voltage stage, thereby greatly reducing the battery The total charging time. That is, the charging method provided by the present application can increase the charging speed of the battery compared with the charging method in the prior art.
  • Example 3 to Example 5 can also prolong the charging time in the constant current phase by using the charging method provided by the application, and greatly reduce the charging time in the constant voltage phase, thereby greatly reducing the charging time. To shorten the total charging time of the battery.
  • Example 1 By comparing Example 1 and Example 2, it can be found that the total charging time of Example 2 is less than the total charging time of Example 1. That is, the total charging time of the battery can be shortened by increasing the SOC at the end of the constant current charging phase. By comparing Example 3 and Example 4, the same conclusion can be drawn.
  • the total charging time refers to the time required for the battery to reach a fully charged state.
  • Step 1 Use a constant current of 1.5C to charge the battery until the battery voltage reaches the cut-off voltage of 4.45V;
  • Step 2 Use a constant current of 1.0C to charge the battery until the battery voltage reaches the cut-off voltage of 4.5V;
  • Step 3 Continue to use a constant voltage of 4.5V to charge the battery until the battery current reaches the cut-off current 0.2C;
  • Step 4 Let the battery stand for 5 minutes
  • Step 5 Use a constant current of 1.0C to discharge the battery until the battery voltage is 3.0V;
  • Step 6 Then let the battery stand for 5 minutes
  • Step 7 Repeat the above steps 1 to 6 for 500 cycles.
  • Embodiments 6 to 10 stated below are for charging the battery using the charging method in the embodiment of the present invention. It should be noted that Embodiments 6 to 9 disclose that fresh batteries are used to obtain the corresponding charging parameters, and the ambient temperature during the charging process is the same as that of Comparative Example 1 and remains unchanged.
  • the fresh battery refers to a battery that has not been used just after leaving the factory, or a battery whose number of charge and discharge cycles after leaving the factory is less than a preset number (such as 10 times, or other times).
  • Step 1 Use a constant current of 1.0C to discharge the battery until the battery voltage is 3.0V;
  • Step 2 Let the battery stand for 5 minutes
  • Step 3 Use a constant current of 1.5C to charge the battery until the battery voltage reaches the cut-off voltage of 4.45V;
  • Step 4 Use a constant current of 1.0C to charge the battery until the battery voltage reaches the cut-off voltage of 4.5V;
  • Step 5 Continue to use a constant voltage of 4.5V to charge the battery until the battery current reaches the cut-off current 0.2C;
  • Step 1 Obtain the actual capacity Q of the battery and the second state of charge (SOC 2 ) before the battery is charged, and judge the charging mode corresponding to the SOC interval to which SOC 2 belongs.
  • the corresponding charging method is constant voltage charging.
  • the voltage (V 1,m-1 ) or preset value of the last constant voltage charging needs to be extracted.
  • SOC 2 85%
  • the corresponding constant voltage charging voltage V 1,m-1 4.5V last time;
  • Step 2 Use a constant voltage of 4.5V to charge the battery at a constant voltage until the state of charge of the battery is 100%.
  • the calculation of the SOC in the above charging process is based on the actual capacity Q;
  • Step 3 Let the battery stand for 5 minutes
  • Step 4 Use a constant current of 1.0C to discharge the battery until the battery voltage is xV (x ⁇ the lowest voltage value of discharge);
  • Step 5 Calculate the actual battery capacity Q according to step 4 to use as the capacity Q in the next charging cycle
  • Step 6 Repeat the above steps 1 to 5 for 500 cycles.
  • SOC 1 and SOC 2 The parameter acquisition process of SOC 1 and SOC 2 is the same as that of Example 6, except for the specific values of actual SOC 1 and SOC 2.
  • the specific values of actual SOC are shown in Table 7 below:
  • the charging process is the same as the charging process in the sixth embodiment, except that the SOC 1 and SOC 2 set in the seventh embodiment are used.
  • Comparative Example 4 discloses a specific implementation process of using a battery that has been cycled 100 times to perform the charging method in the prior art.
  • the charging process is the same as that of Comparative Example 3, except that a battery that has been cycled 100 times is used to perform the charging process of Comparative Example 3.
  • Embodiments 8 to 10 disclose the specific implementation process of the charging method described in this application by using a battery that has been cycled 100 times.
  • the embodiment 8 discloses the use of fresh batteries to obtain the corresponding charging parameters.
  • the charging process is the same as in Example 6, except that a battery that has been cycled 100 times is used for charging.
  • the embodiment 9 discloses the use of fresh batteries to obtain the corresponding charging parameters.
  • the charging process is the same as in Example 7, except that a battery that has been cycled 100 times is used for charging.
  • the embodiment 10 discloses that a battery that has been cycled 100 times is used to obtain the corresponding charging parameters.
  • SOC 1 and SOC 2 The parameter acquisition process of SOC 1 and SOC 2 is the same as that of Example 6, except that a battery that has been cycled 100 times is used to obtain the parameters SOC 1 and SOC 2.
  • the specific values of SOC 1 and SOC 2 are shown in Table 8 below:
  • the charging process is the same as in the sixth embodiment, except that a battery that has been cycled 100 times is used for charging, and the SOC 1 and SOC 2 set in the embodiment 10 are used.
  • Table 9 shows the cut-off conditions of the constant current stage and the charging time of each stage of Comparative Examples 3-4 and Examples 6-10
  • Example 6 and Example 7 can prolong the charging time in the constant current phase by using the charging method provided by the application, and greatly reduce the charging time in the constant voltage phase, thereby greatly reducing the battery The total charging time. That is, the charging method provided by the present application can increase the charging speed of the battery compared with the charging method in the prior art.
  • Example 8 to Example 10 can also extend the charging time in the constant current phase by using the charging method provided by the application, and greatly reduce the charging time in the constant voltage phase, thereby greatly reducing the charging time in the constant voltage phase. To shorten the total charging time of the battery.
  • Example 6 By comparing Example 6 and Example 7, it can be found that the total charging time of Example 7 is less than that of Example 6. That is, the total charging time of the battery can be shortened by increasing the SOC at the end of the constant current charging phase. By comparing Example 8 and Example 9, the same conclusion can be drawn.
  • the total charging time refers to the time required for the battery to reach a fully charged state.
  • the charging system 10 may be divided into one or more modules, and the one or more modules may be stored in the processor 11 and used by the processor 11 Perform the charging method of the embodiment of the present application.
  • the one or more modules may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the charging system 10 in the electronic device 1.
  • the charging system 10 may be divided into the establishment module 101, the acquisition module 102, the judgment module 103, and the charging module 104 in FIG. 3.
  • the establishing module 101 is used to establish a corresponding relationship between a first state of charge and a charging mode, and the first state of charge includes N intervals in sequence; the obtaining module 102 is used to perform the m-th charge and discharge cycle , Acquiring the second state of charge of the battery before charging, m is an integer and m ⁇ 1; the determining module 103 is used to determine that the second state of charge falls in the second state of charge according to the magnitude of the second state of charge The i-th interval in the N intervals, i is an integer and 1 ⁇ i ⁇ N; and the charging module 104 is configured to use the i-th interval and the interval after the i-th interval corresponding to The charging method charges the battery.
  • the battery 12 can be charged and managed to improve the charging efficiency, service life, and reliability of the battery.
  • the battery charging method please refer to the embodiment of the above battery charging method, which will not be described in detail here.
  • the processor 11 may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processors, DSPs), and application specific integrated circuits (Application Specific Integrated Circuits). Integrated Circuit, ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor, or the processor 11 may also be any other conventional processor or the like.
  • modules in the charging system 10 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, this application implements all or part of the processes in the above-mentioned embodiments and methods, and can also be completed by instructing relevant hardware through a computer program.
  • the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the foregoing method embodiments.
  • the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file, or some intermediate forms.
  • the computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory) , Random Access Memory (RAM, Random Access Memory), electrical carrier signal, telecommunications signal, and software distribution media, etc.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • electrical carrier signal telecommunications signal
  • software distribution media etc.
  • the content contained in the computer-readable medium can be appropriately added or deleted according to the requirements of the legislation and patent practice in the jurisdiction.
  • the computer-readable medium Does not include electrical carrier signals and telecommunication signals.
  • module division described above is a logical function division, and there may be other division methods in actual implementation.
  • the functional modules in the various embodiments of the present application may be integrated in the same processing unit, or each module may exist alone physically, or two or more modules may be integrated in the same unit.
  • the above-mentioned integrated modules can be implemented in the form of hardware, or in the form of hardware plus software functional modules.
  • the electronic device 1 may further include a memory (not shown), and the one or more modules may also be stored in the memory and executed by the processor 11.
  • the memory may be an internal memory of the electronic device 1, that is, a memory built in the electronic device 1. In other embodiments, the memory may also be an external memory of the electronic device 1, that is, a memory external to the electronic device 1.
  • the memory is used to store program codes and various data, for example, to store the program codes of the charging system 10 installed in the electronic device 1, and realize high-speed, high-speed, Automatically complete the access of programs or data.
  • the memory may include random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, Flash Card, at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.
  • non-volatile memory such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, Flash Card, at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention concerne un procédé de charge pour une batterie. Le procédé comprend : l'établissement d'une corrélation entre un premier état de charge et un mode de charge, le premier état de charge comprenant N intervalles séquentiels; dans un mième cycle de charge et de décharge, l'obtention d'un second état de charge d'une batterie avant la charge, m étant un nombre entier, et m ≥ 1; en fonction de l'amplitude du second état de charge, déterminer que le second état de charge tombe dans un ième intervalle dans les N intervalles, i étant un nombre entier, et 1 ≤ i ≤ N; et la charge de la batterie en utilisant une manière de charge correspondant au ième intervalle et à un intervalle après l'ième intervalle. L'invention concerne également un procédé de charge pour une batterie, le dispositif électronique et le support de stockage fournis dans la présente invention, le temps de pleine charge d'une batterie peut être raccourci, et le phénomène de surcharge de la batterie peut être évité.
PCT/CN2020/074435 2020-02-06 2020-02-06 Procédé de charge, dispositif électronique et support de stockage WO2021155539A1 (fr)

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