WO2021060719A1

WO2021060719A1 - Method for evaluating battery and electronic device supporting same

Info

Publication number: WO2021060719A1
Application number: PCT/KR2020/011371
Authority: WO
Inventors: 안성진; 김길호; 이재연; 오부근
Original assignee: 삼성전자 주식회사
Priority date: 2019-09-27
Filing date: 2020-08-26
Publication date: 2021-04-01
Also published as: KR20210037424A

Abstract

An electronic device according to various embodiments of the present invention comprises a power supply unit and a processor, wherein the processor can be set to: charge a battery at a first C-rate through the power supply unit in a state in which the battery is completely discharged; perform an operation a specified number of times through the power supply unit when the capacity of the battery reaches a specified battery capacity, wherein said operation involves charging the battery for a first duration at a second C-rate higher than the first C-rate to charge the battery to a first capacity corresponding to the first duration and the second C-rate, and discharging the battery by the first capacity for a second duration at a third C-rate higher than the first C-rate; charge the battery at the first C-rate through the power supply unit so that the battery is completely charged; and, in a state in which the battery is completely charged, discharge the battery at the first C-rate through the power supply unit so that the battery is completely discharged.

Description

Method for evaluating battery and electronic device supporting same

Various embodiments of the present disclosure relate to a method for acquiring information on a state of a battery based on a voltage change amount and charging/discharging efficiency of a battery during charging, and an electronic device supporting the same.

Batteries (eg, secondary batteries) are used in various fields such as mobile devices or electric vehicles. In recent years, the demand for rapid charging is increasing, and types of batteries for rapid charging/rapid discharging are diversifying.

As the number of times the battery is charged or discharged increases, the capacity of the battery may gradually decrease (or the life of the battery of the electronic device may gradually deteriorate). The battery's stability or life is evaluated by observing the change in the capacity of the battery while performing the operation of charging and discharging the battery over several hundred cycles.

A method of evaluating the stability or lifespan of the battery by observing the change in capacity of the battery while performing the operation of charging and discharging the battery over several hundred cycles may take a long time (eg, several months). If the battery is evaluated over a long period of time and then the improved battery is evaluated again, it may take several months additionally, and accordingly, the right time to develop the battery may be missed. In addition, such a battery evaluation method may be difficult to quantitatively analyze the stability of the battery.

Various embodiments of the present invention relate to a method for evaluating a battery, and an electronic device supporting the same, capable of quantitatively evaluating the safety of a battery in a short period (eg, about 1 to 3 days).

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. There will be.

An electronic device according to various embodiments of the present disclosure includes a power supply unit and a processor operatively connected to the power supply unit, wherein the processor includes a first power supply unit through the power supply unit when the battery is completely discharged. When the battery is charged at a C-rate and the capacity of the battery reaches a specified battery capacity, through the power supply unit, at a second C-rate higher than the first C-rate for a first time, the second C-rate Charges the battery for one hour and a first capacity corresponding to the second C-rate, and discharges the battery for a second time at a third C-rate higher than the first C-rate. The battery is charged at the first C-rate so that the battery is fully charged through the power supply unit, and in a state where the battery is fully charged, through the power supply unit. , It may be set to discharge the battery at the first C-rate so that the battery is completely discharged.

The method according to various embodiments of the present invention includes an operation of charging the battery at a first C-rate while the battery is completely discharged, and when the capacity of the battery reaches a specified battery capacity, the first time period. At a second C-rate higher than the first C-rate, the battery is charged by a first capacity corresponding to the first time and the second C-rate, and is higher than the first C-rate for a second time. An operation of discharging the battery by the first capacity at a high third C-rate for a specified number of times, charging the battery at the first C-rate so that the battery is fully charged, and the battery In a fully charged state, discharging the battery at the first C-rate so that the battery is completely discharged may be included.

A method for evaluating a battery according to various embodiments of the present disclosure and an electronic device supporting the same may evaluate the stability of a battery (eg, a battery for rapid charging) in a short period without long-term life evaluation.

A method for evaluating a battery according to various embodiments of the present disclosure and an electronic device supporting the same may shorten the development period of the battery by evaluating the stability of the battery in a short period of time.

A method for evaluating a battery according to various embodiments of the present disclosure and an electronic device supporting the same may quantify a side reaction level of a battery according to a charge rate (or discharge rate) or a state of charge.

1 is a diagram illustrating an environment for evaluating a battery according to various embodiments.

2 is a diagram illustrating an electronic device for evaluating a battery according to various embodiments of the present disclosure.

3 is a diagram illustrating a zero-sum charge/discharge operation according to various embodiments of the present disclosure.

4 is a diagram illustrating a voltage that changes differently depending on whether a side reaction of a battery occurs or not, according to various embodiments of the present disclosure.

5 is a diagram illustrating a method for evaluating a battery according to various embodiments of the present disclosure.

6 is a flowchart illustrating a method for evaluating a battery according to various embodiments of the present disclosure.

7 is a flowchart illustrating a method for evaluating a battery according to various embodiments of the present disclosure.

8 is a diagram illustrating a result of comparing charging and discharging efficiencies of different batteries according to various embodiments of the present disclosure.

9 is a diagram illustrating charging/discharging efficiency of a battery according to the number of pulses applied in a zero-sum charging/discharging operation according to various embodiments of the present disclosure.

10 is a diagram illustrating charge/discharge efficiency for each cycle according to a capacity for starting a zero-sum charge/discharge operation according to various embodiments of the present disclosure.

11 is a diagram illustrating a change in resistance of a battery according to the number of pulses applied in a zero-sum charge/discharge operation according to various embodiments of the present disclosure.

Various embodiments of the present document and terms used therein are not intended to limit the technology described in this document to a specific embodiment, and should be understood to include various modifications, equivalents, and/or substitutes of the corresponding embodiment. In connection with the description of the drawings, similar reference numerals may be used for similar elements. Singular expressions may include plural expressions unless the context clearly indicates otherwise. In this document, expressions such as "A or B", "at least one of A and/or B", "A, B or C" or "at least one of A, B and/or C" are all of the items listed together. It can include possible combinations. Expressions such as "first", "second", "first" or "second" can modify the corresponding elements regardless of their order or importance, and are only used to distinguish one element from another. It does not limit the components. When any (eg, first) component is referred to as being “(functionally or communicatively) connected” or “connected” to another (eg, second) component, the component is It may be directly connected to the component, or may be connected through another component (eg, a third component).

1 is a diagram 100 illustrating an environment for evaluating a battery according to various embodiments.

Referring to FIG. 1, in an embodiment, an environment (or system) for evaluating a battery may include an electronic device 101 and a battery 102 (or a battery cell).

In an embodiment, the electronic device 101 may charge or discharge the battery 102. For example, the electronic device 101 is a battery 102 (for example, the positive and negative terminals of the battery) connected through the cable 103, a constant current, a constant voltage, or a constant power (constant power). By supplying ), the battery 102 can be charged or discharged.

In one embodiment, the electronic device 101 may be referred to as a battery charger and discharger.

In one embodiment, the battery 102 may include a rechargeable secondary battery. For example, the battery 102 is a lithium ion (Li-ion) battery, a lithium ion polymer (Li-ion polymer) battery, a lithium iron phosphate (LiFePO ₄ ) battery, a lead-acid accumulator, nickel cadmium It may include a (NiCd) battery or a nickel hydride (NiMH) battery. However, the present invention is not limited thereto, and the battery 102 may include all secondary batteries capable of charging or discharging.

In one embodiment, the electronic device 101 charges or discharges the battery at a low charge rate or discharge rate (hereinafter referred to as'charge/discharge'), or charges and discharges the battery 102 at a high charge rate or discharge rate. I can make it. Hereinafter, the charging rate or the discharging rate will be referred to as'C-rate'.

In one embodiment, the operation of charging the battery 102 at a low C-rate (eg, about 0.2 C-rate) may correspond to (or simulate) the operation of normal charging (or normal charging) of the battery. In one embodiment, the operation of charging the battery 102 at a high C-rate (eg, about 2 C-rate) may correspond to an operation (or rapid charging) of rapidly (or fast) charging the battery. In one embodiment, the operation of charging the battery 102 at a low C-rate is an operation of charging the battery 102 at a C-rate less than a specified C-rate, and charging the battery 102 at a high C-rate. The operation may be an operation of charging the battery 102 at a C-rate equal to or higher than the designated C-rate.

In one embodiment, the state of charge of the battery 102 may be referred to as a state of charge (SOC) of the battery (0% to 100%). The SOC of the battery 102 may be referred to as the current charge amount or level of charge of the battery.

In one embodiment, compared to the case of charging (or discharging) the battery 102 at a low C-rate (eg, normal charging), the case of charging the battery 102 at a high C-rate (eg, rapid charging) , There may be a high possibility that side reactions may occur in the battery 102 (or more side reactions may occur), and may cause a decrease in the state of health of the battery 102. For example, when charging the battery 102 (e.g., a lithium ion battery) at a high C-rate, a large amount of cations (e.g., lithium ions (Li ⁺ )) are transferred from the positive electrode of the battery 102 to the negative active material ( Example: graphite) Moves to particles, but due to the limitation of the speed at which the moved positive ions enter the negative active material, some of the moved positive ions cannot flow into the negative active material, and metal (for example, lithium) on the negative active material surface (or negative electrode surface) (Li)) can be deposited (or precipitated). A phenomenon in which a metal is deposited on the surface of the negative active material may be referred to as Li-plating. Since lithium deposited on the surface of the negative active material is difficult to form a stable film (protective film) that suppresses reaction with the electrolyte, it may continuously react with the electrolyte of the battery 102 during the charging operation, and in this case, the electrolyte may be consumed. In addition, while lithium ions react with the electrolyte of the battery 102 on the surface of the negative active material, some electrons of the electrons supplied from the electronic device 101 for charging the battery react with the lithium compound (side reactant). Can be created. Accordingly, when the electronic device 101 charges the battery 102 at a high C-rate, the amount of charge in which the battery 102 is actually charged may be smaller than the amount of charge supplied to the battery 102. However, as the electronic device 101 charges the battery 102 at a high C-rate, the reason why the battery 102 is actually charged less than the amount of charge supplied to the battery 102 is limited to the above example. It doesn't work.

In one embodiment, the level of side reactions generated by the electronic device 101 charging (or discharging) the battery 102 at a high C-rate may vary from battery to battery. For example, the level of side reactions generated by charging the battery 102 at a high C-rate by the electronic device 101 may vary from battery to battery, depending on the type of battery, the model of the battery, or the battery manufacturer. . In one embodiment, based on the level of side reactions generated by the electronic device 101 charging (or discharging) the battery 102 at a high C-rate, the battery 102 (eg, the safety of the battery or the battery life) is determined. Can be evaluated.

In one embodiment, the electronic device 101 repeatedly performs an operation of charging and discharging the battery 102 at a high C-rate for a specified number of times while charging the battery 102, May induce side reactions.

For example, the electronic device 101, in a fully discharged state (or fully discharged state), the battery 102 at a low C-rate (hereinafter referred to as a'first C-rate') (102) can be charged. When the battery 102 reaches the specified battery capacity as the battery 102 is charged, the electronic device 101 is set to a specified number of times (for example, about 3 to 50 times), and a high C-rate (hereinafter, The battery 102 is charged by supplying (or applying) a current in the form of a step to the battery 102 as much as the first charge in a'second C-rate'), and the battery 102 is charged. The battery 102 may be discharged by discharging a stepped current from the battery 102 at a second C-rate equal to the first capacity supplied to the battery 102 for charging.

Hereinafter, an operation in which the electronic device 101 charges and discharges the battery 102 at a second C-rate for a specified number of times will be referred to as a'zero-sum charge/discharge operation'. The zero-sum charging/discharging operation may be an operation of charging and discharging the battery 102 with the same capacity so that the capacity of the battery 102 does not change. After performing the zero-sum charge/discharge operation, the electronic device 101 may fully charge the battery 102 at the first C-rate. In an embodiment, the electronic device 101 may discharge the battery 102 at a first C-rate so that the battery 102 is completely discharged after the battery 102 is fully charged. In one embodiment, the second C-rate may be about 1.5 or more greater than the first C-rate. However, it is not limited thereto.

In an embodiment, the electronic device 101 may designate the number of times to perform an operation of charging and discharging the battery 102 at the second C-rate, based on a user input.

In an embodiment, the electronic device 101 may induce a side reaction of the battery 102 by performing a zero-sum charge/discharge operation.

In an embodiment, a current supplied to the battery by the electronic device 101 at a first C-rate or a second C-rate may be a constant current. Hereinafter, in the zero-sum charge/discharge operation, the constant current supplied by the electronic device 101 to the battery 102 will be referred to as a “pulse”. For example, in a zero-sum charge/discharge operation, the electronic device 101 applies a pulse for charging to the battery 102 at a second C-rate, and discharges at a second C-rate after applying the pulse for charging. You can apply a pulse for it.

In one embodiment, in the zero-sum charge/discharge operation, the charge (or amount of charge) supplied to the battery 102 by applying a pulse for charging is extracted from the battery 102 by applying a pulse for discharging. May be the same as the dose.

In the above example, in the zero-sum charge/discharge operation, it has been described that the pulse for charging and the pulse for discharging are applied at the same C-rate, but the present invention is not limited thereto. For example, in a zero-sum charging and discharging operation, the electronic device 101 is first configured to be charged so that the capacity supplied to the battery 102 for charging and the capacity discharged from the battery 102 for discharging are the same. A pulse of a third C-rate may be applied to the battery 102 for a period of time, and a pulse of a fourth C-rate may be applied to the battery 102 for a second period of time for discharging. In one embodiment, when the user (or observer) of the electronic device 101 tries to evaluate the side reaction level of the battery 102 due to the charging operation, the electronic device 101 is A pulse of a third C-rate (for example, about 2 C-rate) higher than the C-rate is applied to the battery 102, and the fourth C-rate for the second time is a time longer than the first time for discharging. The pulse of can be applied. In one embodiment, when the user of the electronic device 101 tries to evaluate the side reaction level of the battery 102 due to the discharging operation, the electronic device 101 is charged at a third C-rate for a first time period for charging. A pulse may be applied to the battery 102, and a pulse having a fourth C-rate higher than the third C-rate may be applied to the battery 102 for a second period of time shorter than the first period for discharging. However, in the following, for convenience of description, it is assumed that the pulse for charging and the pulse for discharging are applied at the same C-rate.

In one embodiment, the electronic device 101 may induce a side reaction of the battery 102 by performing a zero-sum charge/discharge operation, and evaluate the battery 102 by measuring the level of the induced side reaction of the battery 102. .

In one embodiment, the electronic device 101 calculates the capacity supplied to the battery 102 until the battery 102 is fully charged after performing the zero-sum charging and discharging operation, so that the side reaction level of the battery 102 Can be measured. For example, when a side reaction occurs as the electronic device 101 performs a zero-sum charge/discharge operation, the battery 102 is fully charged after the zero-sum charge/discharge operation compared to a case where no side reaction occurs. To this end, a capacity corresponding to the amount of electrons consumed by the side reaction (or the amount of lithium deposited on the surface of the negative electrode active material by lithium-plating) may be additionally supplied to the battery 102. The electronic device 101 may determine that the level of side reactions generated in the battery 102 is greater as the capacity supplied to the battery 102 increases after performing the zero-sum charge/discharge operation until the battery 102 is fully charged. have.

In one embodiment, the electronic device 101 charges the battery 102 at a first C-rate while the battery 102 is completely discharged, and performs a zero-sum charge/discharge operation based on the second C-rate. Then, the operation of fully charging the battery 102 at the first C-rate is sequentially performed, and the battery 102 is transferred to the battery 102 at the first C-rate while the battery 102 is fully charged. The battery 102 may be evaluated based on the charging/discharging efficiency of the battery 102 calculated after completely discharging.

In one embodiment, the charging/discharging efficiency (η) of the battery 102 is supplied to the battery 102 in order to fully charge the battery 102 in a state where the battery 102 is completely discharged, as shown in Equation 1 below. To completely discharge the battery 102 in a fully charged state for one capacity (or amount of charge), the capacity extracted from the battery 102 (or the battery 102 in a fully charged state) is converted to a fully discharged state. It may be a ratio of the capacity consumed to do so.

In one embodiment, the capacity that the electronic device 101 supplies or extracts to the battery 102 to charge or discharge the battery 102 is a current (eg, constant current) by the electronic device 101 to the battery 102. It can be calculated based on the time and C-rate to supply.

In one embodiment, since the electronic device 101 performs a zero-sum charge/discharge operation, the higher the level of side reactions generated in the battery 102 is, the greater the capacity supplied to the battery 102 is measured. The discharge efficiency can be calculated low. In an embodiment, a user of the electronic device 101 may evaluate a battery having a low charging/discharging efficiency of the battery 102 as a battery having a low stability or a short lifespan.

Hereinafter, a method for evaluating the battery 102 will be described in more detail.

2 is a diagram illustrating an electronic device 101 for evaluating a battery according to various embodiments of the present disclosure.

3 is a diagram 300 for explaining a zero-sum charging and discharging operation according to various embodiments of the present disclosure.

2 and 3, in an embodiment, the electronic device 101 may include a power supply unit 210, a processor 220, and a memory 230.

In one embodiment, the power supply 210 may supply power to the battery 102. For example, the power supply unit 210 may supply a constant current (or pulse) to the battery 102 in order to charge or discharge the battery 102. However, the present invention is not limited thereto, and for example, the power supply unit 210 may supply a constant voltage or a constant output.

In one embodiment, the power supply unit 210 may apply a pulse for charging and a pulse for discharging to the battery 102 during a zero-sum charge/discharge operation. For example, during a zero-sum charge/discharge operation, the power supply unit 210 applies a pulse for charging at a second C-rate to the battery 102 and discharges at a second C-rate after applying the pulse for charging. The operation of applying the pulse for the battery 102 to the battery 102 may be repeatedly performed a specified number of times.

In one embodiment, the processor 220 may perform an overall operation for evaluating the battery 102.

In one embodiment, the processor 220, when the battery 102 is completely discharged, through the power supply 210, the battery 102 at a first C-rate (for example, about 0.2 C-rate). Can be charged. For example, the processor 220 may perform an operation for completely discharging the battery 102 before charging the battery 102 at a first C-rate. After the battery 102 is completely discharged, the processor 220 may start an operation of charging the battery 102 at a first C-rate.

In one embodiment, the processor 220 may charge the battery 102 at the first C-rate until the battery capacity reaches the specified battery capacity. For example, the processor 220, as shown in Figure 3, from the time when the battery 102 is in a completely discharged state (t = 0) to the time when the capacity of the battery 102 reaches the specified battery capacity The battery 102 may be charged at a first C-rate (C _{1) until (t=t1).} In an embodiment, the designated battery capacity may be designated by a user of the electronic device 101 (eg, a subject performing battery evaluation).

In one embodiment, when the capacity of the battery reaches the specified battery capacity, the processor 220 may perform a zero-sum charge/discharge operation. For example, the processor 220, through the power supply unit 210, applies a pulse for charging to the battery 102 for a first time at a second C-rate higher than the first C-rate, and The operation of applying a pulse for discharging during the first time at a C-rate may be performed a specified number of times (eg, about 3 to about 50 times). For example, as shown in FIG. 3, the processor 220, through the power supply 210, at a second C-rate (C ₂ ), from a first time (e.g., time (t=t1)) During time (t=t2), time (t=t5) to time (t=t6), and time (t=t9) to time (t=t10)), a pulse for charging is applied, and the second C- Rate(C ₃ ), from the first time (e.g., from time (t=t3) to time (t=t4), from time (t=t7) to time (t=t8), and time from time (t=t11) During (t=t12)), the operation of applying a pulse for discharging may be repeatedly performed three times. In one embodiment, the size (or absolute value) of the second C-rate (C ₂ ) to which the pulse for charging is applied and the size of the second C-rate (C ₃ ) to which the pulse for discharging is applied may be the same. I can.

In one embodiment, the processor 220, as shown in Figure 3, during the zero-sum charging and discharging operation, between the operation of applying the pulse for charging and the operation of applying the pulse for discharging, a specified time (or Resting period) (e.g., from time (t=t2) to time (t=t3), from time (t=t4) to time (t=t5), from time (t=t6) to time (t=t7) , From time (t=t8) to time (t=t9), and from time (t=t10) to time (t=t11)), the pulse may not be applied. In one embodiment, by setting a specified time not to apply a pulse between an operation of applying a pulse for charging and an operation of applying a pulse for discharging, it is possible to more accurately observe a voltage change due to the pulse. In one embodiment, a specified time for not applying a pulse between an operation of applying a pulse for charging and an operation of applying a pulse for discharging may be omitted. In one embodiment, although not shown in FIG. 3, immediately before starting the zero-sum charging and discharging operation (eg, immediately before time (t=t1)) for a specified time or immediately after the zero-sum charging and discharging operation is finished (eg: A pause may be set for at least one of a specified period of time (just after t=t12).

In one embodiment, FIG. 3 illustrates that the pulse for charging and the pulse for discharging are applied to the battery 102 three times, respectively, but the present invention is not limited thereto, and the pulse for charging and the pulse for discharging are each battery The number of times applied to (102) can be set in various ways.

In one embodiment, the capacity of the battery supplied to the battery by the pulse for charging may be the same as the capacity of the battery discharged from the battery 102 by the pulse for discharging. For example, from time (t=t1) to time (t=t2), time (t=t5) to time (t=t6), and time (t=t9) at the second C-rate (C ₂₎ The capacity supplied to the battery 102 by the pulse applied to the battery 102 for each time (t=t10) is from time (t=t3) to time (t=t4) at _{a second C-rate (C 3 ).} ), from time (t=t7) to time (t=t8), and from time (t=t11) to time (t=t12), the capacity released from the battery 102 by a pulse applied to the battery 102, respectively Can be the same.

In one embodiment, the battery capacity supplied to the battery 102 by one pulse for charging and the battery capacity discharged from the battery 102 by one pulse for discharging may be specified. For example, the battery capacity supplied to the battery 102 by one pulse for charging and the battery capacity discharged from the battery 102 by one pulse for discharging are, respectively, the battery capacity in a fully charged state. It can be specified as a dose corresponding to about 10% of the. However, it is not limited thereto.

In one embodiment, based on the specified battery capacity and C-rate supplied or released to the battery 102 by one pulse for charging or discharging, the time the pulse is supplied to the battery 102 is determined (or specified ) Can be. For example, in FIG. 3, when the battery capacity supplied to the battery 102 by one pulse for charging is designated as about 10% of the battery capacity in a fully charged state, and the C-rate is designated as C ₂ , In order to supply about 10% of the battery capacity in a fully charged state, the time (e.g., time (t=t1) to time (t=t2)) for applying a constant current to the battery 102 at a charge rate of _{C 2} Can be determined (or designated).

In one embodiment, based on the C-rate for applying one pulse to the battery 102 and the voltage that may irreversibly damage the battery 102, the supplied to the battery 102 by one pulse. The battery capacity or the time for applying one pulse to the battery 102 may be specified. For example, when a pulse for charging is applied to the battery 102, the voltage across the battery 102 increases (or increases), and when a pulse for discharging is applied to the battery, the voltage across the battery falls (or Decrease). As the voltage across the battery rises or falls, the battery voltage is designated by applying a pulse for charging to the battery 102 (for example, a voltage in a fully charged state) (hereinafter referred to as a'high threshold voltage') When it becomes abnormal or becomes less than or equal to the designated second voltage (for example, the discharge end voltage or the voltage in the fully discharged state) (hereinafter referred to as'low threshold voltage') by applying a pulse for discharging to the battery 102, Battery 102 may be irreversibly damaged. In order not to irreversibly damage the battery 102, a C-rate for applying one pulse to the battery 102 and a voltage that may irreversibly damage the battery 102 (e.g., high or low threshold voltage). Based on at least one of the voltages), a battery capacity supplied to the battery 102 by one pulse or a time for applying one pulse to the battery 102 may be designated (or adjusted).

_{In one embodiment, the size (or absolute value) of the second C-rate (C 3} ) to which the pulse for charging is applied in FIG. 3 and the size of the second C-rate (C ₄ ) to which the pulse for discharging is applied Is illustrated as the same, but is not limited thereto. For example, as described through the embodiments of FIG. 1, the capacity supplied to the battery 102 by the pulse for charging and the capacity discharged from the battery 102 by the pulse for discharging are the same (or the processor (Assuming that the capacity discharged from the supply to the battery 102 is supplied to the battery 102 by the pulse for discharging, which is the same as the capacity supplied to the battery by the pulse for charging), the processor 220 A pulse for charging at a C-rate may be applied to the battery 102 for a second time, and a pulse for discharging at a fourth C-rate may be applied to the battery 102 for a third time longer than the second time. .

In one embodiment, FIG. 3 illustrates that a pulse for charging is applied to the battery 102 and then a pulse for discharging is applied to the battery 102, but is not limited thereto.

In one embodiment, the processor 220, based on the capacity of the battery starting the zero-sum charging and discharging operation (eg, battery capacity at time (t = t3)), based on the pulse for charging, the pulse for discharging It may be applied to the battery 102 earlier (or preferentially), or a pulse for discharging may be applied to the battery 102 before the pulse for charging.

For example, when the capacity of the battery 102 that starts the zero-sum charge/discharge operation is smaller than the first battery capacity (eg, a battery capacity corresponding to about 10%), the pulse for discharging is less than the pulse for charging. When first applied to the battery 102, so that the voltage of the battery 102 does not fall below the low threshold voltage (or does not fall), the processor 220 may apply a pulse for charging before the pulse for discharging. have.

As another example, when the capacity of the battery 102 that starts the zero-sum charging and discharging operation is larger than the capacity of the second battery, the charging pulse is applied to the battery 102 before the discharge pulse. The processor 220 may apply a pulse for discharging to the battery 102 prior to a pulse for charging so that the voltage of 102) does not rise above (or does not increase) above the high threshold voltage. However, the present invention is not limited thereto, and when the capacity of the battery 102 that starts the zero-sum charge/discharge operation falls between the first battery capacity and the second battery capacity, the processor 220 generates a charging pulse. The pulse for discharging may be applied to the battery 102 before the pulse for discharging, or the pulse for discharging may be applied to the battery 102 before the pulse for charging.

In an embodiment, the processor 220 may charge the battery 102 at a first C-rate so that the battery 102 is fully charged after performing a zero-sum charge/discharge operation. For example, as shown in Figure 3, the processor 220, the battery 102 for a time (eg, time (t=t12) to time (t=t13)) at _{a first C-rate (C 1 ).} ) To be fully charged, it is possible to charge the battery 102. In an embodiment, the processor 220 may perform an operation of charging the battery 102 in a constant voltage (CV) mode before completing the charging operation. The processor 220 may have an OCV period by setting the current to 0 before the initial zero-sum pulse and after the final zero-sum pulse.

In one embodiment, the processor 220 may completely discharge the battery 102 at the first C-rate after the battery 102 is fully charged. For example, as shown in Figure 3, the processor 220, the battery 102 for a time (eg, time (t=t13) to time (t=t14)) at _{a first C-rate (C 4 ).} The battery 102 can be discharged so that) is completely discharged. In an embodiment, the size (or absolute value) of the first C-rate (C ₁ ) used for charging and the size of the first C-rate (C ₄ ) used for discharging may be the same.

In one embodiment, the processor 220 charges the battery 102 at a first C-rate while the battery 102 is completely discharged, and performs a zero-sum charge/discharge operation based on the second C-rate. Then, the operation of fully charging the battery 102 at the first C-rate is sequentially performed, and the battery 102 is charged at the first C-rate while the battery 102 is fully charged. After completely discharging, the charging/discharging efficiency of the battery 102 can be calculated.

In one embodiment, the processor 220, referring to FIG. 3, is the charging/discharging efficiency of the battery, which is supplied to the battery 102 in order to fully charge the battery 102 when the battery 102 is completely discharged. Fully charged for capacity (or amount of charge) (e.g., the capacity supplied to battery 102 from time (t=0) to time (t=t1) and time (t=t12) to time (t=t13)) In order to completely discharge the battery 102 in the state, the ratio of the capacity extracted from the battery 102 (e.g., the capacity supplied to the battery 102 from time (t=t13) to time (t=t14)) is calculated. I can. In one embodiment, the processor 220, during the zero-sum charge/discharge operation, the capacity supplied to the battery 102 by pulses for charging and the capacity extracted from the battery 102 by pulses for discharge are Without consideration, the charging/discharging efficiency of the battery 102 can be calculated. However, it is not limited thereto.

In one embodiment, the memory 230 may store various pieces of information calculated while performing an operation of evaluating the battery 102. For example, the memory 230 may store at least one of a battery capacity at a time when a zero-sum charge/discharge operation starts or a battery capacity at a time immediately after a zero-sum charge/discharge operation is performed. However, the information stored by the memory 230 is not limited to the above-described example.

Although not shown in FIG. 2, in an embodiment, the electronic device 101 may additionally include a component. For example, the electronic device 101 is a device for outputting at least one of a current applied to the battery, a voltage measured across the battery, or a capacity supplied to the battery 102 that changes over time (for example: Display) may be further included.

Referring to FIG. 4, in an embodiment, FIG. 4 shows that when one pulse for charging and one pulse for discharging are applied to the battery 102, it changes differently depending on the presence or absence of a side reaction of the battery 102. It may be a diagram showing the voltage.

In one embodiment, the graph 410 of FIG. 4 shows that when one pulse for charging and one pulse for discharging are applied to the battery 102, when a side reaction does not occur in the battery 102. It may be a diagram showing a voltage change.

In one embodiment, the graph 420 of FIG. 4 shows that when one pulse for charging and one pulse for discharging are applied to the battery 102, the battery 102 is applied by applying one pulse for charging. It may be a diagram showing a voltage change when a side reaction occurs in.

In one embodiment, each of the

graphs

410 and 420 of FIG. 4 is a case in which one pulse for charging and one pulse for discharging in FIG. 3 is applied to the battery 102 (e.g., time (t = One for charging in any one of the time intervals from t1) to time (t=t4), from time (t=t5) to time (t=t8), or from time (t=t9) to time (t=t12) When a pulse and one pulse for discharging are applied to the battery 102), it may represent a voltage that changes over time.

In one embodiment, in the graph 410, the voltage V represents a closed circuit voltage (or closed loop voltage) across the battery, and the voltages V ₁ or V ₄ are It may represent an open circuit voltage (or an open loop voltage) across the battery. In one embodiment, in the graph 410, differences between voltages (V ₂ -V ₁ or V ₄ -V ₅ ) may represent a voltage generated by the resistance (or direct current internal resistance (DCIR)) of the battery 102.

In one embodiment, in the graph 410, when a pulse for charging is applied to the battery 102 for a period of time (e.g., for a time period from time (t=t0) to time (t=t15)), the battery The voltage (V) of 102 may _{rise from the voltage (V 1} ) through the voltage (V ₂ ) to the voltage (V ₃ ). During the period during which the pulse is not applied to the battery 102 (e.g., during a time period from time (t=t15) to time (t=t16)) (or during rest), the voltage (V) of the battery 102 is _{The voltage V 4} may be reached as an open circuit voltage after applying a pulse for charging to the battery 102. When a pulse for discharging is applied to the battery 102 for a period of time (e.g., during a time period from time (t=t16) to time (t=t17)), the voltage (V) of the battery 102 is the voltage ( It can fall from V ₄ ) to voltage _{V 6} through voltage _{V 5.} During the period when no pulse is applied to the battery 102 (e.g., during a time period from time (t=t17) to time (t=t18)) (or during rest), the voltage (V) of the battery 102 is discharged. _{The voltage V 1} may be reached as an open circuit voltage after the pulse for is applied to the battery 102.

In one embodiment, as shown in the graph 410, when one pulse for charging and one pulse for discharging are applied to the battery 102, when a side reaction does not occur in the battery 102 Since the voltage difference (V ₃ -V ₁ _{) changed by the pulse for charging is the same as the voltage difference (V 4} -V ₆ ) changed by the pulse for discharging, the open circuit before applying the pulse for charging The voltage (V ₁ ) and the open circuit voltage (V ₁ ) after application of the pulse for discharging can be the same (or can be kept the same) when the pause time is sufficiently long, and reach parallel when the pause time is short. The difference may occur due to the time difference.

_{In one embodiment, in the graph 410, the voltage difference (V 3} -V) changed by the pulse for charging during a period of time (e.g., during a time period from time (t=t0) to time (t=t15)) _The battery 102 is charged by the capacity corresponding to 1 ), and the voltage difference changed by the pulse for discharging for a period of time (e.g., during a time period from time (t=t16) to time (t=t17)) ( The battery 102 may be discharged by a capacity corresponding to _{V 4} -V _{6 ).}

In one embodiment, in the graph 410, the capacity at which the battery 102 is charged for a period of time (for example, during a time period from time (t=t0) to time (t=t15)) is determined by the pulse for charging. The capacity at which the battery 102 is discharged during a time period (eg, during a time period from time (t=t16) to time (t=t17)), which may correspond to a voltage difference (V ₃ -V _{1) that changes by} Silver may correspond to _{a voltage difference (V 4} -V ₆ ) varying by a pulse for discharging.

In one embodiment, in the graph 410, the capacity to be charged during time (e.g., during a time interval from time (t=t0) to time (t=t15)) and during time (e.g., time (t=t16)) Since the discharged capacity is the same during the time period from t=t17), the voltage difference (V ₃ -V ₁ ) changed by the pulse for charging and the voltage difference changed by the pulse for discharging ( V ₄ -V ₆ ) can be the same.

In an embodiment, in the graph 420, the voltage V represents the closed circuit voltage across the battery, and the voltages V _1, V ₈ , or V ₁₁ represent the open circuit voltage across the battery. The voltages V _1, V ₈ , or V ₁₁ may converge in parallel over time. In an embodiment, in the graph 420, differences between voltages (V ₂ -V ₁ or V ₈ -V ₉ ) may represent a voltage generated by the resistance of the battery 102.

In one embodiment, in the graph 420, when a pulse for charging is applied to the battery 102 for a period of time (e.g., during a time period from time (t=t0) to time (t=t15)), the battery The voltage V of 102 may rise from the voltage _{V 1} to the voltage V ₇ _{through the voltage V 2.} In an embodiment, the voltage V ₇ may be smaller (or lower) than _{the voltage V 3} of the graph 410. During the period when the pulse is not applied to the battery (e.g., during the time period from time (t=t15) to time (t=t16)) (or during rest), the voltage (V) of the battery 102 is _{The voltage V 8} can be reached as an open circuit voltage after applying a pulse to the battery 102.

In an embodiment, the voltage difference (eg, V ₁ -V ₈ ) may be different from each other, and the voltage difference (eg, V ₁ -V ₄ ) of the graph 410 may be different from each other. For example, the more the side reactions occur in the graph 420, the voltage of the voltage (V _8), a voltage difference (V ₁ -V ₈₎ is a graph 410 of the can is lowered, and the graph 420, the difference (V ₁ - Can be smaller than V _{4 ).} In one embodiment, when a pulse for discharging is applied to the battery 102 for a period of time (e.g., during a time period from time (t=t16) to time (t=t17)), the voltage of the battery 102 ( V) may fall _{from the voltage V 8} to the voltage V _{10 through the voltage V9.} In one embodiment, the voltage (V ₁₀ ), the voltage difference (eg, V ₁₀ -V ₈ ) is substantially equal to the voltage difference (eg, V ₆ -V ₄ ) of the graph 410, and the voltage (V ₈ ) Since it is less than _{the voltage V 4} of the graph 410, it may be less than the _{voltage V 6.} During the period when no pulse is applied to the battery 102 (e.g., during a time period from time (t=t17) to time (t=t18)) (or during rest), the voltage (V) of the battery 102 is discharged. _{The voltage V 11} may be reached as a voltage after applying the pulse for the battery 102 to the battery 102. In one embodiment, the voltage (V ₁₁ ), the voltage difference (eg, V ₁₁ -V ₁₀ ) is substantially equal to the voltage difference (eg, V ₁ -V ₆ ) of the graph 410, and the voltage (V ₁₀ ) is Since it is less than the voltage V ₆ , it may be less than _{the voltage V 1 of the graph 410.}

In one embodiment, as shown in the graph 420, when one pulse for charging and one pulse for discharging are applied to the battery 102, a side reaction (e.g., for charging) is applied to the battery 102. In the case of a side reaction occurring by applying a pulse), the voltage difference (V ₇ -V ₁ ) that changes by the pulse for charging is greater than _{the voltage difference (V 8} -V _{10) that changes by the pulse for discharging.} Since it is small, the open circuit voltage V ₁ before application of the pulse for charging may be lower (or may be changed lower) than the _{open circuit voltage V 11} after application of the pulse for discharging.

_{In one embodiment, in the graph 420, the voltage difference (V 7} -V) changed by the pulse for charging during a period of time (e.g., during a time period from time (t=t0) to time (t=t15)) _The battery 102 is charged by the capacity corresponding to 1 ), and the voltage difference changed by the pulse for discharging for a period of time (e.g., during a time period from time (t=t16) to time (t=t17)) ( The battery 102 may be discharged by a capacity corresponding to _{V 8} -V _{10 ).} In one embodiment, in the graph 420, since the voltage difference (V ₇ -V ₁ ) changing by the pulse for charging is smaller than _{the voltage difference (V 8} -V ₁₀ ) changing by the pulse for discharging, During a period of time (e.g., during a time period from time (t=t0) to time (t=t15)), the capacity to be charged is a time period from time (e.g., time (t=t16) to time (t=t17)). During) may be smaller than the discharged capacity.

In one embodiment, FIG. 4 illustrates a case in which a side reaction occurs in the battery when a pulse for charging is applied to the battery 102, but when a pulse for discharging is applied to the battery 102, the battery 102 The same or similar can be applied even when a side reaction occurs.

Although not shown in FIG. 4, in one embodiment, in the

graphs

410 and 420, the maximum voltage V ₃ after applying the pulse for charging to the battery 102 is lower than the high threshold voltage and the pulse for charging A pulse for charging and a pulse for discharging may be applied to the battery 102 so that the _{lowest voltage V 10} after applying to the battery 102 is lower than the low threshold voltage.

4 illustrates that the pulse for charging is applied to the battery 102 before the pulse for discharging, but the present invention is not limited thereto. For example, a pulse for discharging may be applied to the battery 102 before a pulse for charging.

Referring to FIG. 5, in one embodiment, the graph 510 and the graph 520 respectively perform the charging/discharging operation for the battery 102 over 3 cycles (or 3 times), so that the battery It can represent the change over time of the current and voltage applied to (102).

In one embodiment, the first charge/discharge cycle (hereinafter referred to as'first cycle') is a current corresponding to the first C-rate so that the battery 102 is fully charged while the battery 102 is completely discharged. Is applied to the battery, and a charge/discharge operation is performed in which a current corresponding to the first C-rate is extracted from the battery 102 so that the battery 102 is completely discharged while the battery 102 is fully charged. have. For example, the processor 220, as shown in Figure 5, in a first cycle (for example, in a time period (A)), in a state in which the battery 102 is completely discharged during the time period (A1) A current corresponding to the first C-rate is applied to the battery 102 so that 102 is fully charged, and the battery 102 is completely discharged while the battery 102 is fully charged during the time period A2. Current corresponding to 1 C-rate may be extracted from the battery 102. In one embodiment, the first cycle may include charging in the CV mode before the operation in the section A1 ends.

In one embodiment, the processor 220, based on the first C-rate and the time interval (A1) (or the size of the time interval (A1)), the battery to charge the battery 102 in the first cycle. To calculate the supply capacity (or charging capacity), and based on the first C-rate and the time interval (A2) (or the size of the time interval (A2)), the battery to discharge the battery 102 in the first cycle From (102), the discharged capacity (or discharge capacity) can be calculated.

In one embodiment, the processor 220, in the first cycle, the capacity supplied to the battery 102 to charge the battery 102 and the capacity discharged from the battery 102 to discharge the battery 102. Based on this, the charging/discharging efficiency of the first cycle can be calculated.

In one embodiment, the second charge/discharge cycle (hereinafter, referred to as'second cycle') is a battery at a first C-rate until the battery capacity reaches a specified capacity in a state where the battery 102 is completely discharged. When the battery 102 is charged and the battery capacity reaches the specified capacity, a zero-sum charge/discharge operation based on the second C-rate is performed, and the battery 102 is fully charged, corresponding to the first C-rate. It may be a cycle in which a current is applied to the battery 102 and a current corresponding to the first C-rate is extracted from the battery 102 so that the battery 102 is completely discharged while the battery 102 is fully charged. For example, the processor 220, as shown in Figure 5, in the second cycle (for example, in the time period (B)), the battery in a state in which the battery 102 is completely discharged during the time period (B1) The battery 102 is charged at the first C-rate until the capacity reaches the specified capacity, and when the battery capacity reaches the specified capacity, zero-sum charging based on the second C-rate during the time period (B2). A discharge operation is performed, and a current corresponding to the first C-rate is applied to the battery 102 during the time period B3 so that the battery 102 is fully charged, and the battery 102 is fully charged. The current corresponding to the first C-rate may be extracted from the battery 102 during the time period B4 so that 102 is completely discharged. In one embodiment, the second cycle may include charging in the CV mode before the operation in section B3 ends.

In one embodiment, the processor 220, based on the first C-rate, the time interval (B1), and the time interval (B3), to the battery 102 to charge the battery 102 in the second cycle. Calculate the capacity (or charging capacity) to be supplied, and based on the first C-rate and time interval (B4), the capacity (or discharge) discharged from the battery 102 to discharge the battery 102 in the second cycle Capacity) can be calculated.

In one embodiment, the processor 220, in the second cycle, the capacity supplied to the battery 102 to charge the battery 102 and the capacity discharged from the battery 102 to discharge the battery 102. Based on this, the charging/discharging efficiency of the second cycle can be calculated.

In an embodiment, the second cycle may be a cycle including the zero-sum charge/discharge operation described with reference to FIGS. 1 to 4 described above.

In one embodiment, the third charge/discharge cycle (hereinafter referred to as'third cycle') is a current corresponding to the first C-rate so that the battery 102 is fully charged while the battery 102 is completely discharged. Is applied to the battery 102, and a charging/discharging operation is performed to extract a current corresponding to the first C-rate from the battery 102 so that the battery 102 is completely discharged while the battery 102 is fully charged. It can be a cycle. For example, the processor 220, as shown in Figure 5, in the third cycle (for example, in the time period (C)), the battery in a state in which the battery 102 is completely discharged during the time period (C1) A current corresponding to the first C-rate is applied to the battery 102 so that 102 is fully charged, and the battery 102 is completely discharged while the battery 102 is fully charged during the time period (C2). Current corresponding to 1 C-rate may be extracted from the battery 102. In one embodiment, the third cycle may include charging in the CV mode before the operation in the section C1 is terminated.

In one embodiment, the processor 220, based on the first C-rate and the time period (C1), the capacity (or charging capacity) supplied to the battery 102 to charge the battery 102 in the third cycle ), and based on the first C-rate and the time interval C2, the capacity (or discharge capacity) discharged from the battery 102 to discharge the battery 102 in the third cycle may be calculated. .

In one embodiment, the processor 220, in the third cycle, the capacity supplied to the battery 102 to charge the battery 102 and the capacity discharged from the battery 102 to discharge the battery 102. Based on this, the charging/discharging efficiency of the third cycle can be calculated.

In one embodiment, when a side reaction occurs in the battery 102 through the zero-sum charge/discharge operation of the second cycle, the capacity supplied to the battery 102 to charge the battery 102 in the second cycle is The capacity supplied to the battery 102 to charge the battery 102 in one cycle and the capacity supplied to the battery 102 to charge the battery 102 in the third cycle may be greater than each.

In one embodiment, when a side reaction occurs in the battery 102 through the zero-sum charging and discharging operation of the second cycle, the zero-sum charging and discharging operation is performed in a time period in which the battery 102 is charged in the second cycle. The time period excluding time (for example, a time period in which the time period B1 and the time period B3 are summed) is a time period in which the battery 102 is charged in the first cycle (eg, a time period A1), and It may be longer than each of the time periods (eg, time period C1) in which the battery 102 is charged in the third cycle.

In one embodiment, when a side reaction does not occur in the battery 102 through the zero-sum charge/discharge operation of the second cycle, the zero-sum charge/discharge operation is performed in the time period in which the battery 102 is charged in the second cycle. The time period excluding the time period (for example, the time period in which the time period (B1) and the time period (B3) are summed) is the time period in which the battery 102 is charged in the first cycle (eg, time period (A1)). ) And the time period for charging the battery 102 in the third cycle (eg, time period C1).

In one embodiment, when a side reaction occurs in the battery 102 through the zero-sum charge/discharge operation of the second cycle, the charge/discharge efficiency of the second cycle is the charge/discharge efficiency of the first cycle and the charge/discharge of the third cycle. The efficiency can be less than each.

In one embodiment, when no side reaction occurs in the battery 102 through the zero-sum charge/discharge operation of the second cycle, the charge/discharge efficiency of the second cycle is the charge/discharge efficiency of the first cycle and the third cycle. It can be quite the same as each of the charge and discharge.

In one embodiment, the processor 220 (or the user of the electronic device 101) is based on the charging/discharging efficiency of the first cycle, the charging/discharging efficiency of the second cycle, and the charging/discharging efficiency of the third cycle. (102) can be evaluated. For example, the processor 220 may determine at least one of a difference between the charge/discharge efficiency of the second cycle and the charge/discharge efficiency of the first cycle, or the difference between the charge/discharge efficiency of the second cycle and the charge/discharge efficiency of the third cycle. Can be calculated. The processor 220, as at least one of the difference between the charging and discharging efficiency of the second cycle and the charging and discharging efficiency of the first cycle, or the difference between the charging and discharging efficiency of the second cycle and the charging and discharging efficiency of the third cycle is larger, the battery ( It can be determined that the degree (or level) at which side reactions occur in 102) is large. However, the present invention is not limited thereto, and in an embodiment, the processor 220 may evaluate the battery 102 based on the charging/discharging efficiency of the second cycle. For example, the processor 220 may determine that the degree of occurrence of a side reaction in the battery 102 is greater as the charging/discharging efficiency of the second cycle is lower.

In one embodiment, the processor 220 (or the user of the electronic device 101) determines the stability of the battery 102 or the life of the battery 102 based on the degree to which a side reaction occurs in the battery 102. I can. For example, the processor 220 may determine that the battery 102 has high stability or that the battery life is longer as the degree of occurrence of the side reaction in the battery 102 decreases.

The electronic device 101 according to various embodiments of the present disclosure includes a power supply unit 210 and a processor 220, and the processor 220 is, in a state in which the battery 102 is completely discharged, the When the battery 102 is charged at a first C-rate through the power supply unit 210 and the capacity of the battery 102 reaches a specified battery capacity, the first At a second C-rate higher than the first C-rate for a period of time, the battery 102 is charged by a first capacity corresponding to the first time and the second C-rate, and the second C-rate is The operation of discharging the battery 102 by the first capacity at a third C-rate higher than the first C-rate is performed a specified number of times, and through the power supply unit 210, the battery 102 is completely In order to be charged, the battery 102 is charged at the first C-rate, and in a state where the battery 102 is fully charged, the battery 102 is completely discharged through the power supply unit 210. , It may be set to discharge the battery 102 at the 1 C-rate.

In various embodiments, the first time and the second C-rate may be the same as the second time and the third C-rate, respectively.

In various embodiments, the processor 220 charges the battery 102 by the first capacity at the second C-rate according to the designated battery capacity, and then charges the battery 102 at the third C-rate. After discharging the battery 102 by a capacity or by discharging the battery 102 by the first capacity at the third C-rate, the battery 102 by the first capacity at the second C-rate It can be set to charge.

In various embodiments, the specified number of times may be specified by a user.

In various embodiments, the processor 220, the second capacity supplied to the battery 102 until the capacity of the battery 102 reaches a specified battery capacity, the first at the second C-rate. After charging the battery 102 by the capacity and discharging the battery 102 by the first capacity at the third C-rate, the first supplied to the battery 102 to fully charge the battery 102 3, based on the capacity and the fourth capacity supplied to the battery 102 to completely discharge the battery 102 while the battery 102 is fully charged, the first charging and discharging of the battery 102 It can be set to yield efficiency.

In various embodiments, the processor 220 is in a state in which the battery 102 is completely discharged before charging the battery 102 at the first C-rate while the battery 102 is completely discharged. In a state in which the battery 102 is fully charged at the first C-rate, and the battery 102 is fully charged, the battery 102 is transferred to the battery at the first C-rate. Completely discharging 102, and completely charging the battery 102 at the first C-rate while the battery 102 is completely discharged, and the battery 102 is fully charged. The battery 102 may be set to calculate the second charging/discharging efficiency of the battery 102 based on an operation of completely discharging the battery 102 at the first C-rate in the current state.

In various embodiments, after discharging the battery 102 at the first C-rate while the battery 102 is fully charged, the battery 102 is discharged while the battery 102 is completely discharged. The battery 102 is fully charged at the first C-rate, and the battery 102 is completely discharged at the first C-rate while the battery 102 is fully charged. In a state in which the battery 102 is completely discharged, the battery 102 is fully charged at the first C-rate, and the battery 102 is fully charged. ) May be set to calculate the third charge/discharge efficiency of the battery 102 based on an operation of completely discharging the battery 102 at the first C-rate.

In various embodiments, the first time is designated so that the voltage of the battery 102 increases below a specified voltage while charging the battery 102 by the first capacity at the second C-rate, and the The second time period may be designated so that the voltage of the battery 102 decreases above a specified voltage while discharging the battery 102 by the first capacity at the third C-rate.

In various embodiments, the processor 220 charges the battery 102 by the first capacity at the second C-rate for the specified number of times and the first capacity at the third C-rate. While discharging the battery 102, it may be set to check a change in the resistance of the battery 102.

In various embodiments, the capacity of the designated battery 102 may be designated by a user.

6 is a flow diagram 600 describing a method for evaluating battery 102, according to various embodiments of the present invention.

6, in operation 601, in an embodiment, the processor 220 charges the battery 102 at a first C-rate (eg, about 0.2 C-rate) through the power supply 210 I can make it. For example, the processor 220 may perform an operation for completely discharging the battery 102 before charging the battery 102 at a first C-rate. After the battery 102 is completely discharged, the processor 220 may start an operation of charging the battery 102 at a first C-rate.

In one embodiment, the processor 220 may charge the battery 102 at the first C-rate until the battery capacity reaches the specified battery capacity.

In an embodiment, the designated battery capacity may be designated by a user of the electronic device 101 (eg, a subject performing battery evaluation).

In operation 603, in one embodiment, the processor 220, the battery 102 at a C-rate higher than the first C-rate, e.g., a second C-rate (e.g., about 2 C-rate). The operation of charging and discharging can be performed a specified number of times.

In one embodiment, when the capacity of the battery 102 reaches the specified battery capacity, the processor 220 may perform a zero-sum charge/discharge operation. For example, the processor 220, through the power supply unit 210, applies a pulse for charging to the battery 102 for a first time at a second C-rate higher than the first C-rate, and The operation of applying a pulse for discharging during the first time at a C-rate may be performed a specified number of times (eg, about 3 to about 50 times).

In one embodiment, the processor 220, during a zero-sum charge/discharge operation, between the operation of applying a pulse for charging and the operation of applying the pulse for discharge, during a specified time (or resting period) It is possible to not apply a pulse. In one embodiment, by setting a specified time not to apply a pulse between an operation of applying a pulse for charging and an operation of applying a pulse for discharging, it is possible to more accurately observe a voltage change due to the pulse. In one embodiment, a specified time for not applying a pulse between an operation of applying a pulse for charging and an operation of applying a pulse for discharging may be omitted. In an embodiment, a pause may be set for at least one of a specified time immediately before starting the zero-sum charging/discharging operation or for a specified time immediately after ending the zero-sum charging/discharging operation.

In one embodiment, the capacity of the battery supplied to the battery 102 by the pulse for charging may be the same as the capacity of the battery discharged from the battery 102 by the pulse for discharging.

In one embodiment, the battery capacity supplied to the battery 102 by one pulse for charging and the battery capacity discharged from the battery 102 by one pulse for discharging are, for example, the electronic device 101 ) Can be specified by the user. For example, the battery capacity supplied to the battery 102 by one pulse for charging and the battery capacity discharged from the battery 102 by one pulse for discharging are, respectively, the battery capacity in a fully charged state. It can be specified as a dose corresponding to about 10% of the. However, it is not limited thereto.

In one embodiment, based on the specified battery capacity and C-rate supplied or released to the battery 102 by one pulse for charging or discharging, the time the pulse is supplied to the battery 102 is determined (or specified ) Can be.

In one embodiment, based on the C-rate for applying one pulse to the battery 102 and the voltage that may irreversibly damage the battery 102, supply to the battery 102 by one pulse ( Alternatively, the capacity of the battery to be discharged or a time for applying one pulse to the battery 102 may be specified. For example, when a pulse for charging is applied to the battery 102, the voltage across the battery increases, and when a pulse for discharging is applied to the battery 102, the voltage across the battery may decrease. As the voltage across the battery rises or falls, the battery voltage becomes higher than the high threshold voltage by applying a pulse for charging to the battery 102, or below the low threshold voltage by applying a pulse for discharging to the battery 102. If so, the battery can be irreversibly damaged. In order not to irreversibly damage the battery 102, a C-rate for applying one pulse to the battery 102 and a voltage that may irreversibly damage the battery 102 (e.g., high or low threshold voltage). Based on at least one of the voltages), a battery capacity supplied (or discharged) to the battery 102 by one pulse or a time period for applying one pulse to the battery 102 may be specified (or adjusted).

In one embodiment, in operation 603, it is exemplified that the magnitude (or absolute value) of the second C-rate to which the pulse for charging is applied and the magnitude of the second C-rate to which the pulse for discharging is applied are the same. It is not limited thereto. For example, so that the capacity supplied to the battery 102 by the pulse for charging and the capacity discharged from the battery 102 by the pulse for discharging are the same (or the processor 220 is (Assuming that the same capacity as the capacity supplied to 102 is extracted from the battery 102 by a pulse for discharging), the processor 220 applies a pulse for charging at a third C-rate for a second time. During application to the battery 102, a pulse for discharging at a fourth C-rate may be applied to the battery 102 for a third time longer than the second time.

In one embodiment, the processor 220, based on the capacity of the battery 102 to start the zero-sum charging and discharging operation, the pulse for charging prior to (or preferentially) the pulse for discharging the battery 102 Or, a pulse for discharging may be applied to the battery 102 before the pulse for charging. For example, when the capacity of the battery 102 starting the zero-sum charge/discharge operation is smaller than the first battery capacity (eg, a battery capacity corresponding to about 10%), the pulse for discharging is less than the pulse for charging. When first applied to the battery 102, so that the voltage of the battery 102 does not drop (or does not decrease) below the low threshold voltage, the processor 220 may apply the pulse for charging before the pulse for discharging. have. For another example, when the capacity of the battery 102 that starts the zero-sum charging and discharging operation is larger than the capacity of the second battery, the charging pulse is applied to the battery 102 before the discharge pulse. The processor 220 may apply a pulse for discharging to the battery 102 prior to the pulse for charging so that the voltage of 102) does not rise (or does not increase) above the high threshold voltage. However, the present invention is not limited thereto, and when the capacity of the battery 102 that starts the zero-sum charge/discharge operation falls between the first battery capacity and the second battery capacity, the processor 220 generates a charging pulse. A pulse for discharging may be applied to the battery 102 before the pulse for discharging, or a pulse for discharging may be applied to the battery 102 before a pulse for a wind field.

In an embodiment, the processor 220 may designate the number of times to perform an operation of charging and discharging the battery 102 at a second C-rate (eg, about 2 C-rate) based on a user input.

In operation 605, in an embodiment, the processor 220 may charge the battery 102 at a first C-rate so that the battery 102 is fully charged after performing a zero-sum charge/discharge operation. .

In operation 607, in one embodiment, the processor 220 may completely discharge the battery 102 at a first C-rate after the battery 102 is fully charged.

Although not shown in FIG. 6, in an embodiment, the processor 220 charges the battery 102 at a first C-rate while the battery 102 is completely discharged, and based on the second C-rate. A zero-sum charge/discharge operation is performed, the operation of completely charging the battery 102 at the first C-rate is sequentially performed, and the battery 102 is transferred to the first C- After completely discharging the battery 102 at the rate, the charging/discharging efficiency of the battery 102 may be calculated.

Although not shown in FIG. 6, in an embodiment, the processor 220 may evaluate the battery 102 based on the charging/discharging efficiency of the battery 102. For example, the processor 220 may determine that the lower the charging/discharging efficiency of the battery 102 is, the greater the degree to which a side reaction occurs in the battery 102. In one embodiment, the processor 220 (or the user of the electronic device 101) determines the stability of the battery 102 or the life of the battery 102 based on the degree to which a side reaction occurs in the battery 102. I can. For example, the processor 220 may determine that the battery 102 has a higher stability or that the battery 102 has a longer life as the degree of occurrence of the side reaction in the battery 102 decreases.

7 is a flow chart 700 describing a method for evaluating the battery 102, according to various embodiments of the present invention.

Referring to FIG. 7, in operation 701, the processor 220 may charge and discharge the battery 102 at a first C-rate through the power supply unit 210.

In an embodiment, operation 701 may be an operation corresponding to the first cycle described with reference to FIG. 5. For example, the processor 220 generates a current corresponding to the first C-rate so that the battery 102 is fully charged in a state where the battery 102 is completely discharged (or after completely discharging the battery 102). A current corresponding to the first C-rate may be discharged from the battery 102 such that it is applied to the battery 102 and the battery 102 is completely discharged while the battery 102 is fully charged.

In one embodiment, the processor 220, based on the first C-rate and the time for supplying the current for charging to the battery 102, the capacity to supply the battery 102 to charge the battery 102 (Or charging capacity) can be calculated. The processor 220, based on the first C-rate and the time for supplying the current for discharging to the battery 102, the capacity extracted from the battery 102 to discharge the battery 102 in the first cycle ( Alternatively, the discharge capacity) can be calculated.

In one embodiment, the processor 220, based on the capacity supplied to the battery 102 to charge the battery 102 and the capacity extracted from the battery 102 to discharge the battery 102, operation 701 After performing (or after performing the first cycle), the charging/discharging efficiency of the battery 102 may be calculated.

In operation 703, in an embodiment, the processor 220 may charge the battery 102 at a first C-rate (eg, about 0.2 C-rate) through the power supply 210.

In operation 705, in one embodiment, the processor 220, the battery 102 at a C-rate higher than the first C-rate, e.g., a second C-rate (e.g., about 2 C-rate). The operation of charging and discharging can be performed a specified number of times.

In operation 707, in an embodiment, the processor 220 may charge the battery 102 at a first C-rate so that the battery 102 is fully charged after performing a zero-sum charge/discharge operation. .

In operation 709, in one embodiment, the processor 220 may completely discharge the battery 102 at a first C-rate after the battery 102 is fully charged.

In an embodiment, since operations 703 to 709 are at least partially the same as or similar to operations 601 to 607 of FIG. 6, detailed descriptions will be omitted.

In an embodiment, operations 703 to 709 may be operations corresponding to the second cycle described in FIG. 5.

In one embodiment, the processor 220, the first C-rate, and the time until reaching the specified capacity in operation 703 (e.g., the time of supplying current until reaching the specified capacity) and operation 707 The time from the time after (or after the completion of the zero-sum charge/discharge operation) to the time until the battery 102 is fully charged (e.g., the battery 102 is fully charged from the completion of the zero-sum charge/discharge operation) The capacity (or charging capacity) supplied to the battery 102 in order to charge the battery 102 may be calculated based on the time obtained by adding up the time until the current is supplied. In one embodiment, the first C-rate, and the time from when the battery 102 is fully charged in operation 709 until the battery 102 is completely discharged (for example, when the battery 102 is fully charged) Based on the time of supplying current to completely discharge the battery 102), the capacity (or discharge capacity) extracted from the battery 102 to discharge the battery 102 may be calculated. .

In one embodiment, the processor 220, in operations 703 to 709 (or in the second cycle), to discharge the battery 102 and the capacity supplied to the battery 102 to charge the battery 102 Based on the capacity extracted from the battery 102, the charging/discharging efficiency of the battery 102 may be calculated.

In operation 711, the processor 220 may charge and discharge the battery 102 at a first C-rate through the power supply unit 210.

In an embodiment, operation 711 may be an operation corresponding to the third cycle described in FIG. 5. For example, the processor 220 generates a current corresponding to the first C-rate so that the battery 102 is fully charged in a state where the battery 102 is completely discharged (or after completely discharging the battery 102). A current corresponding to the first C-rate may be discharged from the battery 102 such that it is applied to the battery 102 and the battery 102 is completely discharged while the battery 102 is fully charged.

In an embodiment, in operation 711, the processor 220 may calculate the charging/discharging efficiency of the battery 102 in the same manner as described in operation 701.

Although not shown in FIG. 7, in an embodiment, when a side reaction occurs in the battery 102 by performing operation 705, the charging/discharging efficiency calculated through operations 703 to 709 (eg, charging/discharging efficiency of the second cycle) May be smaller than the charging/discharging efficiency calculated through operation 701 (eg, charging and discharging efficiency in the first cycle) and charging/discharging efficiency calculated through operation 711 (eg, charging and discharging efficiency in the third cycle).

In one embodiment, when a side reaction does not occur in the battery 102 by performing the operation 705, the charge/discharge efficiency (eg, charge/discharge efficiency of the second cycle) calculated through the operations 703 to 709 is determined by the operation 701. The charging/discharging efficiency calculated through (eg, charging/discharging efficiency in the first cycle) and the charging/discharging efficiency calculated through operation 711 (eg, charging/discharging efficiency in the third cycle) may be substantially the same.

In one embodiment, the processor 220 (or the user of the electronic device 101), the charge/discharge efficiency calculated through operation 701, the charge/discharge efficiency calculated through operation 703 to operation 709, and the operation 711 Based on the charging and discharging efficiency, the battery 102 may be evaluated. For example, the processor 220, the difference between the charge and discharge efficiency calculated through the operation 703 to operation 709 and the charge/discharge efficiency calculated through operation 701, or the charge/discharge efficiency and operation calculated through operation 703 to operation 709 At least one of the differences between charge and discharge efficiencies calculated through 711 may be calculated. The processor 220, the difference between the charge/discharge efficiency calculated through the operations 703 to 709 and the charge/discharge efficiency calculated through the operation 701, or the charge/discharge efficiency calculated through the operations 703 to 709 and the operation 711 As at least one of the difference between the charged and discharge efficiencies is greater, it may be determined that the degree (or level) of the side reaction in the battery 102 is greater. However, the present invention is not limited thereto, and in an embodiment, the processor 220 may evaluate the battery 102 based on the charge/discharge efficiency calculated through operations 703 to 709. For example, the processor 220 may determine that the degree of occurrence of a side reaction in the battery 102 is greater as the charge/discharge efficiency calculated through operations 703 to 709 is lower.

In one embodiment, the processor 220 (or the user of the electronic device 101) determines the stability of the battery 102 or the life of the battery 102 based on the degree to which a side reaction occurs in the battery 102. I can. For example, the processor 220 may determine that the battery 102 has a higher stability or that the battery 102 has a longer life as the degree of occurrence of the side reaction in the battery 102 decreases.

In an embodiment, FIG. 7 illustrates that both

operations

701 and 711 are performed, but is not limited thereto. For example, operation 701 or operation 711 may be omitted.

Referring to FIG. 8, in an embodiment, a graph 810 may be a diagram showing charge/discharge efficiency calculated after performing a charge/discharge operation for a first battery during a first cycle to a third cycle. For example, in the graph 810, for the first battery, reference numeral 811 denotes charge/discharge efficiency of the first cycle, reference numeral 813 denotes charge/discharge efficiency of the second cycle, and reference numeral 815 May represent the charging and discharging efficiency of the third cycle.

In an embodiment, the graph 820 may be a diagram showing the charge/discharge efficiency calculated after performing a charge/discharge operation during a first cycle to a third cycle for a second battery different from the first battery. In the graph 820, for the second battery, reference numeral 821 denotes charge/discharge efficiency of the first cycle, reference numeral 823 denotes charge/discharge efficiency of the second cycle, and reference numeral 825 denotes the third cycle. It can show the charging/discharging efficiency of

In one embodiment, in the

graphs

810 and 820, for each of the first battery and the second battery, a zero-sum using the same pulse (eg, a pulse for charging and a pulse for discharging) in the second cycle. It can be assumed that the charging and discharging operation has been performed.

In one embodiment, comparing the graph 810 and the graph 820, the charging/discharging efficiency of the first cycle and the charging/discharging efficiency of the third cycle for the first battery are, respectively, of the first cycle of the second battery. The charge/discharge efficiency and the charge/discharge efficiency of the third cycle may be substantially the same. In one embodiment, comparing the graph 810 and the graph 820, the charging/discharging efficiency of the second cycle for the first battery may be smaller than that of the second cycle for the second battery. In one embodiment, the processor 220 (or the user of the electronic device 101), based on the charging/discharging efficiency of the second cycle for the first battery and the charging/discharging efficiency of the second cycle for the second battery, When the first battery is charged at a higher C-rate (eg, the second C-rate) than the second battery, it may be evaluated as more stable.

9 is a diagram 900 showing charge/discharge efficiency of the battery 102 according to the number of pulses applied in a zero-sum charge/discharge operation according to various embodiments of the present disclosure.

Referring to FIG. 9, in one embodiment, for the first battery 102, reference numeral 911 denotes charge/discharge efficiency of the first cycle, reference numeral 913 denotes charge/discharge efficiency of the second cycle, and Number 915 may indicate the charging and discharging efficiency of the third cycle. In one embodiment, the charging/discharging efficiency of the second cycle corresponding to the reference numeral 913 is calculated when the pulse for charging and the pulse for discharging are applied over about 10 times during the second cycle. It can be efficiency.

In one embodiment, for a second battery that corresponds to the same type and model as the first battery and manufactured by the same manufacturer, reference numeral 921 denotes charge/discharge efficiency of the first cycle, and reference numeral 923 denotes the first battery. Charge/discharge efficiency of two cycles, and reference numeral 925 may indicate charge/discharge efficiency of a third cycle. In one embodiment, the charging/discharging efficiency of the second cycle corresponding to the reference numeral 923 is calculated when the pulse for charging and the pulse for discharging are applied over about 50 times during the second cycle. It can be efficiency.

In an embodiment, as the pulse for charging and the pulse for discharging are applied more times during the second cycle, the charging/discharging efficiency of the second cycle may be lowered. For example, as shown in FIG. 9, the charging/discharging efficiency of the second cycle of the first battery 102 may be lower than that of the second cycle of the second battery.

10 is a diagram 1000 showing charge/discharge efficiency for each cycle according to a capacity at which a zero-sum charge/discharge operation starts according to various embodiments of the present disclosure.

Referring to FIG. 10, in an embodiment, FIG. 10 may assume that a zero-sum charge/discharge operation is performed in a second cycle.

In one embodiment, reference numeral 1001 denotes the charging and discharging efficiency of the first cycle according to the capacity (or SOC) to start the zero-sum charging and discharging operation, and reference numeral 1005 denotes a zero-sum charging and discharging operation. The charging/discharging efficiency of the second cycle according to the starting capacity is indicated, and reference numeral 1003 may indicate the charging/discharging efficiency of the third cycle according to the capacity of starting the zero-sum charging/discharging operation.

In one embodiment, referring to reference numeral 1005 of FIG. 10, the larger the capacity for starting the zero-sum charge/discharge operation in the second cycle, the lower the charge/discharge efficiency of the second cycle. For example, the charge/discharge efficiency of the second cycle calculated after performing the first zero-sum charge/discharge operation at the SOC of the battery 102 is 60%, and the SOC of the battery 102 is 30% to the first zero. The second zero-sum charge/discharge operation is the same as the -sum charge/discharge operation (for example, applying the same number of charge pulses and discharge pulses to the battery 102 at the same C-rate as the first zero-sum charge/discharge operation). It may be lower than the charging/discharging efficiency of the second cycle calculated after performing. In an embodiment, a side reaction such as lithium-plating may occur due to a zero-sum charge/discharge operation, and as the SOC of the battery 102 increases, the degree of occurrence of lithium-plating may increase. In an embodiment, due to a side reaction such as lithium-plating, the charging/discharging efficiency of the battery 102 may decrease.

In one embodiment, the processor 220 may calculate the charging/discharging efficiency of the battery 102 that changes according to the SOC starting the zero-sum charging/discharging operation.

11 is a diagram 1100 showing a change in resistance of the battery 102 according to the number of pulses applied in a zero-sum charge/discharge operation according to various embodiments of the present disclosure.

Referring to FIG. 11, in one embodiment, FIG. 11 shows a pulse for charging and discharging during a zero-sum charging/discharging operation when a zero-sum charging/discharging operation is performed at an SOC of 50% of the battery 102. The resistance (or direct current internal resistance (DCIR)) of the battery 102 may change as the number of times the pulse is applied increases. In one embodiment, the resistance of the battery 102 is divided by the difference between voltage values measured immediately before and immediately after applying the pulse for charging or the pulse for discharging to the battery 102 by the constant current applied to the battery 102. May correspond to a value. For example, the change in the resistance of the battery 102 is a plurality of times, when a pulse for charging and discharging is applied to the battery 102, a pulse for charging or a pulse for discharging at each of the plurality of times. It may correspond to a change in a value obtained by dividing a difference between voltage values measured immediately before and immediately after applying a pulse to the battery 102 by a constant current applied to the battery 102.

In one embodiment, when performing a zero-sum charge/discharge operation, the processor 220 increases the number of times of applying a pulse for charging and a pulse for discharging during the zero-sum charge/discharge operation. The change in resistance can be calculated (or measured).

In one embodiment, reference numeral 1101 in FIG. 11 denotes a pulse for charging and a pulse for discharging during a zero-sum charging/discharging operation when a zero-sum charging/discharging operation is performed at 50% SOC of the battery 102. It may represent a change in resistance of the battery 102 according to an increase in the number of times that is applied. In one embodiment, reference numeral 1103 in FIG. 11 may be a line linearly representing a change in resistance of the battery 102 of reference numeral 1101.

In one embodiment, as illustrated in FIG. 11, as the number of times of applying a pulse for charging and a pulse for discharging during a zero-sum charge/discharge operation increases, the resistance of the battery 102 may increase.

In one embodiment, as the degree of side reaction occurring in the battery 102 increases, the resistance of the battery 102 may increase.

The method according to various embodiments of the present invention includes an operation of charging the battery 102 at a first C-rate while the battery 102 is completely discharged, and the capacity of the battery 102 is adjusted to a specified battery capacity. When reached, the battery 102 is charged with a second C-rate higher than the first C-rate for a first time, by a first capacity corresponding to the first time and the second C-rate, and , An operation of discharging the battery 102 by the first capacity at a third C-rate higher than the first C-rate for a second time period for a specified number of times, so that the battery 102 is fully charged. , Charging the battery 102 at the first C-rate, and in a state where the battery 102 is fully charged, so that the battery 102 is completely discharged, the battery at the 1 C-rate ( 102).

In various embodiments, performing an operation of charging the battery 102 by the first capacity at the second C-rate and discharging the battery 102 by the first capacity at the third C-rate Is, according to the designated battery capacity, charging the battery 102 by the first capacity at the second C-rate and then discharging the battery 102 by the first capacity at the third C-rate. Or discharging the battery 102 by the first capacity at the third C-rate and then charging the battery 102 by the first capacity at the second C-rate.

In various embodiments, the method includes a second capacity supplied to the battery 102 until the capacity of the battery 102 reaches a specified battery capacity, and the first capacity at the second C-rate. A third capacity supplied to the battery 102 to fully charge the battery 102 after charging the battery 102 and discharging the battery 102 by the first capacity at the third C-rate, And calculating a first charge/discharge efficiency of the battery 102 based on the fourth capacity extracted from the battery 102 in order to completely discharge the battery 102 while the battery 102 is fully charged. It may further include an operation.

In various embodiments, the method includes, in a state in which the battery 102 is completely discharged, before charging the battery 102 at the first C-rate, the battery 102 is completely discharged. (102) The battery 102 is fully charged at the first C-rate, and the battery 102 is transferred to the battery 102 at the first C-rate while the battery 102 is fully charged. The operation of completely discharging the battery, and completely charging the battery 102 at the first C-rate while the battery 102 is completely discharged, and the battery 102 is fully charged. In the state, based on the operation of completely discharging the battery 102 at the first C-rate, the operation of calculating a second charge/discharge efficiency of the battery 102 may be included.

In various embodiments, the method includes discharging the battery 102 at the first C-rate while the battery 102 is fully charged, and then the battery 102 is completely discharged. (102) The battery 102 is fully charged at the first C-rate, and the battery 102 is transferred to the battery 102 at the first C-rate while the battery 102 is fully charged. The operation of completely discharging the battery, and completely charging the battery 102 at the first C-rate while the battery 102 is completely discharged, and the battery 102 is fully charged. In the state, the operation of calculating a third charge/discharge efficiency of the battery 102 based on an operation of completely discharging the battery 102 at the first C-rate may be further included.

In various embodiments, the method comprises charging the battery 102 by the first capacity at the second C-rate for the specified number of times, and charging the battery 102 by the first capacity at the third C-rate. While discharging ), an operation of checking a change in resistance of the battery 102 may be further included.

In addition, the structure of the data used in the above-described embodiment of the present invention can be recorded on a computer-readable recording medium through various means. The computer-readable recording medium includes a storage medium such as a magnetic storage medium (eg, ROM, floppy disk, hard disk, etc.), and an optical reading medium (eg, CD-ROM, DVD, etc.).

In one embodiment, the computer-readable recording medium is an operation of charging the battery 102 at a first C-rate in a state in which the battery 102 is completely discharged in the electronic device 101. When the capacity reaches the specified battery capacity, at a second C-rate higher than the first C-rate for a first time, the battery by a first capacity corresponding to the first time and the second C-rate An operation of charging 102 and discharging the battery 102 by the first capacity at a third C-rate higher than the first C-rate for a second time period a specified number of times, the battery ( 102) is fully charged, charging the battery 102 at the first C-rate, and in a state where the battery 102 is fully charged, the battery 102 is completely discharged, the 1 C A program for executing an operation of discharging the battery 102 at -rate can be recorded.

So far, the present invention has been looked at around its preferred embodiments. Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

Claims

In the electronic device,

Power supply;

And

And a processor operatively connected to the power supply,

The processor,

In a state in which the battery is completely discharged, the battery is charged at a first C-rate through the power supply,

When the capacity of the battery reaches the specified battery capacity, through the power supply unit, at a second C-rate higher than the first C-rate for a first time, the first time and the second C-rate Charging the battery by a corresponding first capacity, and discharging the battery by the first capacity at a third C-rate higher than the first C-rate for a second time period a specified number of times,

Through the power supply, charging the battery at the first C-rate so that the battery is fully charged, and

An electronic device configured to discharge the battery at the first C-rate so that the battery is completely discharged through the power supply unit while the battery is fully charged.
The electronic device of claim 1, wherein the first time and the second C-rate are the same as the second time and the third C-rate, respectively.
The method of claim 1,

The processor,

According to the designated battery capacity, after charging the battery by the first capacity at the second C-rate and discharging the battery by the first capacity at the third C-rate, or the third C-rate An electronic device configured to discharge the battery by the first capacity and then charge the battery by the first capacity at the second C-rate.
The electronic device of claim 1, wherein the specified number of times is specified by a user.
The method of claim 1,

The processor,

The second capacity supplied to the battery until the capacity of the battery reaches a specified battery capacity, and the first capacity is charged by the first capacity at the second C-rate, and the first capacity at the third C-rate. Based on the third capacity supplied to the battery to fully charge the battery after discharging the battery by the amount, and a fourth capacity extracted from the battery to completely discharge the battery when the battery is fully charged, An electronic device configured to calculate a first charge/discharge efficiency of the battery.
The method of claim 5,

The processor,

Before charging the battery at the first C-rate while the battery is completely discharged, completely charge the battery at the first C-rate while the battery is completely discharged, and the battery In a fully charged state, completely discharging the battery at the first C-rate,

The operation of completely charging the battery at the first C-rate while the battery is completely discharged, and completely discharging the battery at the first C-rate while the battery is fully charged An electronic device configured to calculate a second charging/discharging efficiency of the battery based on.
The method of claim 5,

The processor,

After discharging the battery at the first C-rate while the battery is fully charged, the battery is fully charged at the first C-rate while the battery is completely discharged, and the battery In a fully charged state, completely discharging the battery at the first C-rate,

The operation of completely charging the battery at the first C-rate while the battery is completely discharged, and completely discharging the battery at the first C-rate while the battery is fully charged An electronic device configured to calculate a third charging/discharging efficiency of the battery based on the battery.
The method of claim 1,

The first time is designated so that the voltage of the battery increases below a specified voltage while charging the battery by the first capacity at the second C-rate,

The second time period is designated so that the voltage of the battery decreases above a specified voltage while discharging the battery by the first capacity at the third C-rate.
The method of claim 1,

The processor,

While charging the battery by the first capacity at the second C-rate for the specified number of times and discharging the battery by the first capacity at the third C-rate, to check a change in resistance of the battery Set electronic devices.
The method of claim 1,

An electronic device whose capacity of the designated battery is designated by a user.
In the way,

Charging the battery at a first C-rate while the battery is completely discharged;

When the capacity of the battery reaches the specified battery capacity, the second C-rate is higher than the first C-rate for a first time, and a first capacity corresponding to the first time and the second C-rate. And performing an operation of charging the battery and discharging the battery by the first capacity at a third C-rate higher than the first C-rate for a second time period a specified number of times;

Charging the battery at the first C-rate so that the battery is fully charged; And

And discharging the battery at the first C-rate so that the battery is completely discharged while the battery is fully charged.
The method of claim 11, wherein the first time and the second C-rate are the same as the second time and the third C-rate, respectively.
The method of claim 11,

The operation of charging the battery by the first capacity at the second C-rate and discharging the battery by the first capacity at the third C-rate,

Depending on the designated battery capacity, the battery is charged by the first capacity at the second C-rate, and then the battery is discharged by the first capacity at the third C-rate or at the third C-rate. And charging the battery by the first capacity at the second C-rate after discharging the battery by the first capacity.
12. The method of claim 11, wherein the specified number of times is specified by a user.
The method of claim 11,

The second capacity supplied to the battery until the capacity of the battery reaches a specified battery capacity, and the first capacity is charged by the first capacity at the second C-rate, and the first capacity at the third C-rate. Based on the third capacity supplied to the battery to fully charge the battery after discharging the battery by the amount, and a fourth capacity extracted from the battery to completely discharge the battery when the battery is fully charged, The method further comprising calculating a first charge/discharge efficiency of the battery.