KR20170022778A - Charging method of battery and battery pack thereof - Google Patents

Abstract

The present invention relates to a battery charging method and a battery pack using the same. In one aspect of the present invention, provided is the battery pack comprising: a battery; a voltage detecting unit detecting the voltage of a terminal voltage of the battery; a current detecting unit detecting the current flowing in the battery; a control unit controlling charging of the battery and controlling constant-current constant-voltage (CC-CV) charging to be repeated multiple times in a single charging cycle, wherein the CC-CV charging is that the control unit carries out constant-current charging by supplying a charging current with a predetermined current value to the battery, and if the terminal voltage of the battery detected by the voltage detecting unit becomes equal to a predetermined voltage value while the constant-current charging is carried out, the control unit carries out constant-voltage charging by supplying a charging voltage with a predetermined voltage value to the battery until the current value detected by the current detecting unit reaches a predetermined threshold current value; and a counter counting charging cycles of the battery to determine the number of charging cycles of the battery to which charging is carried out by the control unit corresponds. If the charging cycle is repeated a predetermined number of times, the control unit controls at least one among i) a first predetermined current value that is applied to a first CC-CV charging from among repeated CC-CV chargings, ii) a first predetermined voltage value that is applied to the first CC-CV charging, and iii) a first predetermined threshold current value that is applied to the last CC-CV charging to be changed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a charging method for a battery,

The present invention relates to a battery charging method and a battery pack therefor.

Generally, a battery is used as an energy source for a mobile device, an electric vehicle, a hybrid vehicle, and an electric power source. The battery is variously used depending on the type of an external device.

A small-capacity battery is used for a portable electronic device such as a mobile phone, a notebook computer, and a camcorder, and a large-capacity battery can be used as a motor driving power source for a hybrid or electric vehicle. In this case, when long-time driving and high-power driving are required, a plurality of battery cells are electrically connected to each other to increase output and capacity, thereby constituting a large-capacity battery module. The battery module can increase the output voltage or output current according to the number of the built-in battery cells, and a plurality of such battery modules can be electrically connected to form a battery pack.

Here, each battery cell includes an electrode assembly formed with positive and negative electrodes on both sides of a separator, a case including an electrode assembly, and an electrode terminal electrically connected to the electrode assembly and extending to the outside of the case.

As battery cells are repeatedly charged and discharged, performance and lifespan are shortened and stable and sufficient power sources can not be provided. In order to use batteries more efficiently, the speed at which the performance and life of battery cells are shortened There is a growing interest and research to slow it down.

The present invention makes it possible to slow down the rate at which deterioration of the battery pack proceeds and to improve the life characteristics of the battery pack.

According to an embodiment of the present invention, there is provided a battery pack including a battery, a voltage detector for detecting a terminal voltage of the battery, a current detector for detecting a current flowing in the battery, When the terminal voltage of the battery detected by the voltage detecting unit is equal to a predetermined voltage value while the constant current charging is being performed, the current value detected by the current detecting unit is A constant current and a constant voltage charging in which a charging voltage having the predetermined voltage value is supplied to the battery to be charged to a constant voltage until a predetermined threshold current value is reached is repeated a plurality of times during one charging cycle, And counting the number of charge cycles of the battery, Wherein the control unit includes a counter for measuring a number of charge cycles of the charge, wherein the control unit controls the charge current to be applied to the first constant current constant voltage charging during the constant current constant voltage charging repeated a plurality of times when the charge cycle is repeated a predetermined number of times Ii) a first predetermined voltage value applied to the first constant current constant voltage charging; or iii) a first prescribed threshold current value applied to the last constant current constant voltage charging. So as to control the battery pack.

The constant current-constant voltage charging is repeated a plurality of times while the i-th charging cycle is performed. The control unit increases the predetermined voltage value every time the constant current-constant voltage charging is repeated, And a battery pack for reducing the predetermined threshold current value.

When the predetermined number of times is n, the control section determines that the (m + 1) th charge cycle section from the mxn + 1th charge cycle to the (m + 1) th charge cycle is a natural number, and m is an integer equal to or greater than 0 I) the first predetermined current value applied to the first constant current constant voltage charging, ii) the first predetermined voltage value applied to the first constant current constant voltage charging, or iii) when the charging cycle period is changed, And a value of at least one of a first predetermined threshold current value applied to the last constant current constant voltage charging is changed.

Further, a storage unit that stores a profile including data on the predetermined current value, the predetermined voltage value, and the threshold current value applied to each of the constant current-constant voltage charging during the constant current-constant voltage charging that is repeated a plurality of times Wherein the control unit applies the same profile to the charge cycles included in the same section among the plurality of charge cycle sections and applies different profiles to the charge cycles included in different sections. Pack.

Also, the control unit may control the first predetermined threshold current value applied to the last constant current constant voltage charging to be reduced as the charging cycle section increases.

Also, the control unit may control the battery pack so that the time during which the constant-voltage charge is maintained during the last constant-current constant-voltage charge becomes longer as the charge cycle section increases.

Also, the control unit controls the first predetermined current value applied to the first constant-current constant-voltage charging to be decreased as the charge cycle section increases.

Also, the control unit may control the battery pack so that the time during which the constant-current charge is maintained during the first constant-current constant-voltage charge increases as the charge cycle section increases.

Also, the control unit controls the first voltage value applied to the last constant-current constant-voltage charging to be increased as the charge cycle section increases.

The apparatus may further include a timer for measuring the charging time of the battery, and the last constant voltage charging time is controlled so that the charging time required for the charging cycle of the battery is maintained for a predetermined time Suggest a battery pack.

According to the present invention, the speed at which deterioration of the battery pack progresses can be slowed to improve the life characteristics of the battery pack.

1 is a block diagram showing the configuration of a battery pack according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a multistage constant current-constant voltage charging performed during one charge cycle according to an embodiment of the present invention. FIG.
3A to 3C are views for explaining a charge control operation according to an embodiment of the present invention.
4A to 4C are views for explaining a charge control operation according to another embodiment of the present invention.
FIG. 5 is a graph showing life characteristics of a battery when a charge control method according to the present invention is applied.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

1 is a block diagram showing the configuration of a battery pack according to an embodiment of the present invention.

1, a battery pack 100 according to the present invention includes a battery 110, a charging switch 120, a discharging switch 130, a temperature sensor 140, a current sensor 150, and an MPU 160 (Micro Processor Unit).

The battery pack 100 may be connected to an external electronic device (not shown) through the pack terminals P + and P- and the communication terminals C and D, Mobile phones, smart phones, notebook computers, and the like. Of course, the external electronic device may be a power supply unit (not shown) itself.

First, the battery 110 may include at least one battery cell, and the battery cell may be a secondary battery capable of charging and discharging according to consumption or supply of electric energy.

For example, the secondary battery may be a nickel-cadmium battery, a lead-acid battery, a nickel metal hydride battery (NiMH), a lithium battery, a lithium polymer battery, And the like, and the kind of the secondary battery is not limited thereto.

Also, although the battery is shown as one battery cell in FIG. 1, a plurality of battery cells connected in series or in parallel may be provided.

Next, the charging switch 120 may be provided between the positive terminal B + of the battery 110 and the positive terminal P + of the battery pack. This is because when the battery 110 is overcharged, the control of the MPU 160 Signal to prevent the battery 110 from overcharging. The charging switch 120 may be a conventional MOSFET or a relay, but the present invention is not limited thereto.

The discharge switch 130 may also be provided between the positive terminal B + of the battery 110 and the positive terminal P + of the battery pack 110. This is because when the battery 110 is overdischarged, And is turned off by the control signal, thereby preventing the battery 110 from being overdischarged. The discharge switch 130 may be a conventional MOSFET or a relay, but the present invention is not limited thereto.

The temperature sensor 140 may be attached directly to the battery 110 or may be installed around the battery 110 to sense the ambient temperature of the battery 110 or the battery 110 and transmit it to the MPU 160 send. The temperature sensor 140 may be, for example, a thermistor, but is not limited thereto.

Next, the current sensor 150 may be installed between the negative terminal B- of the battery 110 and the negative terminal P- of the battery pack, which detects the charging current and the discharging current of the battery 110 And transmits it to the MPU 160. The current sensor 150 may be any one selected from the group consisting of a Hall sensor, a shunt resistor, and the like, but the present invention is not limited thereto.

Next, the MPU 160 may be configured to include a voltage sensor 161, a switch driver 162, a counter 163, a storage unit 164, a timer 165, and a control unit 166.

The voltage sensor 161 is connected in parallel to the battery 110 to sense a terminal voltage of the battery 110, converts the voltage into a digital signal, and transmits the digital signal to the controller 166.

It is a matter of course that the current obtained from the current sensor 150 and the temperature information obtained from the temperature sensor 140 are also converted into digital signals and transmitted to the control unit 166.

The switch driver 162 turns on or off the charge switch 120 and / or the discharge switch 130 according to the control signal of the controller 166. [ That is, the control unit 166 can control the switch driver 162 based on the information obtained from the temperature sensor 140, the current sensor 150, the voltage sensor 161, and the like.

For example, when the charged amount of the battery 110 is full (100%), the control unit 166 may transmit a control signal to the switch driving unit 162 to turn off the charging switch 120.

If the controller 166 determines that an overcurrent flows in the battery cell 110 based on the information obtained from the current sensor 150, the controller 166 transmits a control signal to the switch driver 162, (130) is turned off.

The control unit 166 transmits a control signal to the switch driving unit 162 to determine whether the battery 110 is overcharged and / or overdischarged based on the information obtained from the voltage sensor 161, The discharge switch 130 can be turned off.

The control unit 166 can transmit a signal requesting a predetermined current value to the external electronic device (or the power supply unit itself) through the communication terminals C and D, A current is supplied to the battery pack 100 so that constant current charging can be performed.

The control unit 166 controls the external electronic device (or the power supply unit itself) to supply a predetermined voltage (for example, a predetermined voltage) to the battery pack 100 when the terminal voltage of the battery pack 100 sensed by the voltage sensor 161 reaches a predetermined voltage value while the constant- Lt; RTI ID = 0.0 > value. ≪ / RTI > Thereby, a charging voltage having a predetermined voltage value is supplied from the external electronic device to the battery pack 100, so that the constant voltage charging can be performed.

When the constant voltage charging starts, the control unit 166 can maintain the constant voltage charging until the charging current value sensed by the current sensor 150 reaches a predetermined threshold current value.

The control unit 166 may perform the multi-step constant current-constant voltage charging in which the constant-current charging and the constant-voltage charging as described above are alternately repeated a plurality of times while one charging cycle is performed.

The multi-step constant current-constant voltage charging will be described in detail with reference to FIG. 2 below.

Meanwhile, in this specification, the charging cycle is considered to be started when the charging current starts to flow and the charging cycle is terminated when the charging switch 120 is turned off when the battery 110 is fully charged.

Next, the storage unit 164 is applied to each constant-current or constant-voltage charging in the multi-stage constant-current-constant-voltage charging. The storage unit 164 stores a predetermined current value Is applied to the constant-current charging and a predetermined voltage value Vth applied to the constant- It is possible to store a profile including data on a predetermined threshold current value Ith.

For example, when the charging of the battery 110 is controlled so that the constant current-constant voltage charging is repeated three times while one charging cycle is performed, the data included in the profile may be as shown in Table 1 below.

step The predetermined current value
Is The predetermined voltage value
Vth The predetermined threshold current value Ith One I3 V1 I2 2 I2 V2 I1 3 I1 V3 I0

In Table 1, the relationship of the current values is I3 > I2 > I1 > I0, and the relationship of the voltage values may be V3 > V2 > V1. At this time, V3 is the full charge voltage value of the battery 110, and I0 is the determination current value for determining the full charge of the battery.

That is, as the constant current-constant voltage charging is repeated, the charge current value (hereinafter also referred to as Ic) gradually decreases, and the terminal voltage (hereinafter also referred to as Vb) gradually increases. In this case, the threshold current value Ith in the constant voltage charging can be used as the current value Is of the constant current charging which is subsequently repeated.

A plurality of profiles may be stored in the storage unit 164 to apply different profiles according to the count value of the accumulated charge cycles. The controller 166 may store a plurality of profiles stored in the storage unit 164, And the corresponding multi-step constant current-constant voltage charging can be executed. The storage unit 164 may be a ROM, an EEPROM, a flash memory, or an equivalent memory device.

FIG. 2 is a diagram for explaining a multistage constant current-constant voltage charging performed during one charge cycle according to an embodiment of the present invention. FIG.

Referring to Table 1, when the multi-step constant current-constant voltage charging is performed, the current value Is is set to I3, the voltage value Vth is set to V1, and the threshold current value Ith is set to I2 when the new charging cycle is started. That is, as shown in FIG. 2, the first constant current charging in which the charging current having the current value of I3 flows into the battery pack 100 starts (CC1 section in FIG. 2).

The terminal voltage Vb rises as it is charged by the charging current having the value of I3 and when the terminal voltage Vb reaches the constant voltage charging start voltage Vth, that is, V1 while the first constant current charging is proceeding, Is started (CV1 section in Fig. 2).

As the battery 100 is charged with the charging voltage having the voltage value of V1 while the second constant voltage charging progresses, the charging current value sensed by the current sensor 150 gradually decreases, The first constant voltage charging continues until the threshold current value I2 is reached.

Next, when the charging current value reaches the threshold current value I2 while the first constant voltage charging is being performed, the current value Is is set to I2, the voltage value Vth is set to V2, the threshold current value Ith is set to I1, and the constant current- Charging is repeated (CC2 and CV2 sections in Fig. 2).

That is, when the terminal voltage Vb reaches V2 due to the second constant current charging and the second constant current charging in which the charging current having the current value of I2 flows into the battery pack 100, The second constant voltage charging in which the charging voltage flows into the battery pack 100 is performed.

Finally, when the charging current value reaches the threshold current value I1 while the second constant voltage charging is being performed, the current value Is is set to I1, the voltage value Vth is set to V3, the threshold current value Ith is set to I0, and the last constant current- Charging is performed (CC3 and CV3 in Fig. 2). In the present specification, it is assumed that the constant current-constant voltage charging is repeated three times for convenience of explanation, but the present invention is not limited thereto.

According to the present invention, when one charging cycle is performed, the multi-stage constant current-constant voltage charging can be performed to charge the battery fully.

Next, the counter 163 according to the present invention accumulates the charge cycle every time the battery 110 is charged, increases its value, and determines how many times the charge cycle is repeated for the battery 110, Information on the number of charge cycles may be obtained and transmitted to the control unit 166. [

According to the present invention, the (m + 1) th charging cycle to the (m + 1) th charging cycle can be set to be the (m + 1) th period, Or more.

For example, assuming that n, which is a criterion for dividing a section, is 50, the first period from the first charge cycle to the 50th charge cycle, the second period from the 51st charge cycle to the 100th charge cycle, the second period from the 101st charge cycle The third section from the 150th charging cycle to the seventh section from the 301st charging cycle to the 350th charging cycle.

According to the present invention, the multi-step constant current-constant voltage charging is performed by applying different profiles to different sections, so that the control unit 166 determines whether the order of the charge cycles acquired from the counter 163 is any one of a plurality of sections Constant-current-constant-voltage charging corresponding to the profile applied to the specified section can be performed. On the other hand, the same profile can be applied to the charge cycles included in the same section.

Next, the timer 165 measures the charging time of the battery 110, and transmits it to the control unit 166. The timer 165 may basically be a clock built in the MPU 160. As will be described later, the controller 166 acquires information on the total charge time of the battery, the time of each constant current or the constant voltage section acquired from the timer 165, so that the entire charge time is constant even if the charge cycle is repeated, The duration of each constant current or constant voltage section can be controlled.

Hereinafter, a charging control method according to an embodiment of the present invention will be described in detail.

3A to 3C are diagrams for explaining a charge control operation according to an embodiment of the present invention. FIG. 3A shows a case where the charge cycle included in the first section is performed, 3C is a diagram showing a charging current Ic flowing into the battery pack 100 by a profile differently applied when the charging cycle included in the third section is performed.

First, when it is determined that a new charge cycle for the battery pack 100 is started, the control unit 166 refers to the cumulative counting information of the charge cycle obtained from the counter 163 to determine in which interval the charge cycle is included . When it is determined that the charging cycle is included in the first section, the controller 166 can control the multistage constant current-constant voltage charging to which the first profile as shown in FIG. 3A is applied.

The values of Is, Vth, and Ith applied to the CC1 and CV1 sections are (I3, V1, I2), CC2 and CV2 (I1, V3, I0-1) applied to the last constant current-constant voltage section CC3 and CV3 are (Is, Vth, and Ith) Lt; / RTI >

The first profile may be applied to the multistage constant current-constant voltage charging performed in each of the plurality of charge cycles included in the first section. If the cumulative counting of the charge cycle is included in the second section after the first section is exceeded, From which a second profile as shown in Figure 3b can be applied.

More specifically, in the data on the current value Is, the voltage value Vth and the threshold current value Ith included in the second profile, the values of Is, Vth and Ith applied to the CC1 and CV1 sections are (I3, V1, I2) Vth and Ith applied to the CC2 and CV2 sections are (I2, V2 and I1), and the values of Is, Vth and Ith applied to the CC3 and CV3 sections during the last constant current and the constant voltage section are (I1, V3, I0-2).

On the other hand, the same profile can be applied to the multistage constant current-constant voltage charging performed in each of the plurality of charging cycles included in the second section, and the cumulative counting of the charging cycles may be included in the third section , Then a third profile as shown in Figure 3c may be applied thereafter.

More specifically, the values of Is, Vth and Ith applied to the CC1 and CV1 sections are (I3, V1, I2) in the data concerning the current value Is, the voltage value Vth and the threshold current value Ith included in the third profile, Vth and Ith applied to the CC2 and CV2 sections are (I2, V2 and I1), and the values of Is, Vth and Ith applied to the CC3 and CV3 sections during the last constant current and the constant voltage section are (I1, V3, I0-3).

As described above, when a different profile is applied according to the section, the larger the cumulative number of charge cycles, the greater the value of the threshold current value Ith applied to the final constant voltage step during the multistage constant current-constant voltage charging (CV3 section in the graphs of FIGS. The relationship of I0-1, I0-2 and I0-3 included in the first to third profiles may be I0-3 < I0-2 < I0-1.

In addition, the controller 166 can control the progression time of the last constant voltage charge in the multi-step constant current-constant voltage charging (the section CV3 in the graph of FIGS. 3A to 3C) to be longer as the section increases. That is, as shown in FIGS. 3A to 3C, the value of t6-t5 may gradually increase.

Although not shown in FIGS. 3A to 3C, it is also possible to control the voltage value Vth applied to the last constant voltage step (CV3 section in the graph of FIGS. 3A to 3C) to increase as the section increases.

Generally, as the battery is used, that is, as the battery is repeatedly charged and discharged, the capacity of the battery gradually decreases (deterioration of the battery), and as the capacity of the battery decreases, It becomes shorter and shorter.

However, according to the present invention, when the charging cycle is repeated a predetermined number of times, the threshold current value of the last constant voltage charging is reduced compared with the previous time, or the last constant voltage charging time is maintained longer than the previous time, The capacity of the battery can be ensured by making the value larger than the previous value, so that the rate at which the capacity of the battery decreases, that is, the rate at which the deterioration of the battery progresses, can be slowed and the life of the battery can be extended. The effect of the present invention will be described in detail with reference to Fig. 5 below.

5 is a graph showing the degree of deterioration of a battery when the charge control method according to the present invention is applied.

Referring to FIG. 5, the x axis represents the number of charge cycles and the right y axis represents the critical current value Ith of the last constant voltage charge applied for each section. Also, the y-axis on the left represents the battery capacity as the charge cycle is repeated.

The single-dot chain line and the thin solid line in FIG. 5 are for explaining the degree of deterioration of the battery when the multi-step constant current-constant voltage charging method according to the related art is applied. According to the prior art, Even if repeated, the same profile is applied.

According to this method, as shown by the thin solid line, the battery capacity is reduced by about 30% when the charge cycle is repeated about 350 times or more.

5, the dotted line and the thick solid line represent the degree of deterioration of the battery according to the present invention. As indicated by the dotted line, the critical current value Ith of the final positive voltage charging decreases as the interval increases. Meanwhile, the interval may be increased each time the charge cycle is repeated 50 times, that is, it may be the first interval from 1 to 50 charge cycles, and the second interval from 51 to 100 charge cycles.

According to the present invention, as indicated by the bold solid line, it can be seen that the battery capacity increases every time the section is increased and the threshold current value Ith is decreased. That is, unlike the prior art in which the battery capacity is gradually reduced as the charge cycle is repeated, the battery capacity increases each time a predetermined charge cycle is repeated. As the number of times the charge cycle is repeated increases It can be seen that the degree of deterioration of the battery is lower than that of the prior art.

For example, referring to FIG. 5, when the battery capacity reaches 70% of the initial capacity, the life of the battery is about 350 to 370, According to the present invention, since the charging cycle is 450 times or more, the battery life is prolonged.

Hereinafter, a charging control method according to another embodiment of the present invention will be described in detail.

4A to 4C are diagrams for explaining a charge control operation according to another embodiment of the present invention. FIG. 4A is a view showing a state where the charge cycle included in the first section is performed, The charge current Ic flowing into the battery pack 100 by the profile differently applied when the charge cycle included in the third section is performed is shown.

First, as the intervals are different, different profiles are respectively applied to charge the battery, as described above. However, in this case, in order to reduce the current value Is applied to the first constant current charging (CC1 section in the graph of FIGS. 4A to 4C) during the multi-stage constant current-constant voltage charging as the section increases, 3 profile can be stored in the storage unit 164.

That is, an Is value applied to the first constant current charging section in the first profile applied to the first section is I0-1, an Is value applied to the first constant current charging section in the second profile applied to the second section is I0-2, and Is in the third profile applied to the third section, and the Is value applied to the first constant current charging section is I0-3, the relationship between I0-1, I0-2, and I0-3 is I0-3 &Lt; I0-2 < I0-1.

4A to 4C, the controller 166 can control the current value Is of the CC1 section to decrease while increasing the duration t2-t1 of the CC1 section as the section increases.

As the deterioration of the battery progresses, the internal resistance of the battery increases and the constant current charging section becomes shorter. In particular, in the first constant current section, the charging period is shortened due to the high current Is. In such a case, a capacity loss of the battery occurs in the first constant current section, and the life of the battery may be shortened.

Therefore, as described above, the charging time of the first constant current section is increased by the shorter time, thereby securing the capacity of the battery and slowing the rate at which the deterioration of the battery progresses.

In particular, the control unit 166 maintains the total charge time at a constant level with reference to the total charge time of the battery 110 measured by the timer 165, the respective constant-current charge period and the constant-voltage charge period period The constant current charging section time or the constant voltage charging section time can be adjusted as described above.

Meanwhile, in order to perform the multistage constant current-constant voltage charging, it is of course possible to reduce the current value Is of the first constant current charge and decrease the critical current value Ith of the final constant voltage charge as the section increases. In this case, it is possible to control the holding time of the first constant current charging and the last constant voltage charging to be long so that the entire charging time is always kept constant even if the deterioration of the battery progresses. That is, even if charging and discharging of the battery 110 are repeated, (t2-t1) and (t6-t5) can be made gradually longer so that the value of t6 is always constant.

In the present specification, for convenience of explanation, it is assumed that the interval is changed (or increased) each time the charge cycle is repeated a predetermined number of times, but the present invention is not limited thereto. That is, the controller 166 may monitor the degree of deterioration of the battery, and the interval may be changed (or increased) every time the degree of deterioration of the battery becomes less than a preset reference.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

100: Battery pack 110: Battery
120: charge switch 130: discharge switch
140: Temperature sensor 150: Current sensor
160: Micro Processor Unit (MPU)
161: voltage sensor 162; The switch-
163: Counter 164:
165: timer 166:

Claims (10)

battery;
A voltage detector for detecting a terminal voltage of the battery;
A current detector for detecting a current flowing in the battery;
Wherein the control unit controls the charging of the battery so that a charging current having a predetermined current value is supplied to the battery so as to be charged to a constant current and the terminal voltage of the battery detected by the voltage detecting unit during the constant- A constant current-constant voltage control unit that supplies a charging voltage having the predetermined voltage value to the battery until the current value detected by the current detecting unit reaches a predetermined threshold current value, A control unit which causes the charging to be repeated a plurality of times while one charging cycle is performed; And
And a counter for counting the number of charge cycles of the battery and measuring the number of charge cycles corresponding to the charge performed by the control unit,
Wherein the controller is configured to: i) determine, when the charging cycle repeats a predetermined number of times, a first predetermined current value applied to the first constant current-constant voltage charging during the plurality of repetitive constant current-constant voltage charging, ii) - a first predetermined voltage value applied to constant voltage charging, or iii) a first predetermined threshold current value applied to last constant current - constant voltage charging. The method according to claim 1,
Wherein,
the constant current and the constant voltage charging are repeated a plurality of times while the i-th charging cycle is performed, the constant voltage and the predetermined threshold current are increased each time the constant current and the constant voltage charging are repeated, A battery pack that reduces the value. The method according to claim 1,
Wherein,
When the predetermined number of times is n, the (m + 1) th charge cycle section from the (m + 1) th charge cycle to the (m + 1) th charge cycle is a natural number, and m is an integer greater than or equal to 0 when doing,
At least any one of i) the first predetermined current value, ii) the first predetermined voltage value, or iii) the first predetermined threshold current value is changed every time the charge cycle section is changed Features a battery pack. The method of claim 3,
And a storage unit for storing a profile including data on the predetermined current value, the predetermined voltage value, and the threshold current value applied to each of the constant current-constant voltage charging during the repeated charging of the constant current and the constant voltage &Lt; / RTI &
Wherein,
Wherein the same profile is applied to the charge cycles included in the same section among the plurality of charge cycle sections and different profiles are applied to the charge cycles included in different sections. The method of claim 3,
Wherein,
And the first predetermined threshold current value applied to the last constant current-constant voltage charging is decreased as the sequence of the charge cycle section increases. 6. The method of claim 5,
Wherein,
Wherein the control unit controls the charging time of the constant-voltage charging to be longer during the last constant-current-constant-voltage charging as the sequence of the charging cycle section increases. The method of claim 3,
Wherein,
And the first predetermined current value applied to the first constant current-constant voltage charging is decreased as the sequence of the charge cycle section increases. 8. The method of claim 7,
Wherein,
Wherein the control is performed such that the time during which the constant current charging is maintained during the first constant current-constant voltage charging is prolonged as the sequence of the charge cycle section increases. The method of claim 3,
Wherein,
And the first voltage value applied to the last constant current-constant voltage charging is increased as the sequence of the charge cycle section increases. 6. The method of claim 5,
And a timer for measuring a charging time of the battery,
Wherein the control unit controls the last constant voltage charging time so that the charging time required while the charging cycle of the battery is performed once is maintained at a preset time.

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