TW201813230A - Battery protection integrated circuit, protection circuit and protection method thereof - Google Patents

Battery protection integrated circuit, protection circuit and protection method thereof Download PDF

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Publication number
TW201813230A
TW201813230A TW105129872A TW105129872A TW201813230A TW 201813230 A TW201813230 A TW 201813230A TW 105129872 A TW105129872 A TW 105129872A TW 105129872 A TW105129872 A TW 105129872A TW 201813230 A TW201813230 A TW 201813230A
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Taiwan
Prior art keywords
charging
battery
switch
battery protection
current
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TW105129872A
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Chinese (zh)
Inventor
陳威蓉
蔡育明
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力智電子股份有限公司
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Publication date
Application filed by 力智電子股份有限公司 filed Critical 力智電子股份有限公司
Priority to TW105129872A priority Critical patent/TW201813230A/en
Priority to CN201610956149.6A priority patent/CN107819338A/en
Publication of TW201813230A publication Critical patent/TW201813230A/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00711—Regulation of charging or discharging current or voltage with introduction of pulses during the charging process

Abstract

A battery protection integrated circuit is coupled between a battery and a charger and coupled to a charging switch. The battery protection integrated circuit includes a charging switch controlling pin, a control unit and a current sensing pin. The charging switch controlling pin is coupled to the charging switch. The control unit is coupled to the charging switch controlling pin and the current sensing pin. The current sensing pin is used to sensing a charging current. When the charging current is larger than a first default value and maintains a first default time, the control unit controls the charging switch turned-on for a second default time and turned-off for a third default time repeatedly to perform pulse charging operation on the battery. The first default is lower than an over current protection current default value.

Description

電池保護積體電路、及其保護電路、保護方法    Battery protection integrated circuit, protection circuit and protection method thereof   

本發明與電池保護有關，特別是關於一種電池保護積體電路、及其保護電路、保護方法。 The invention relates to battery protection, in particular to a battery protection integrated circuit, a protection circuit and a protection method thereof.

請參照圖1，圖1為先前技術採用的電池保護電路1。電池保護電路1包含電池保護積體電路10，電池保護積體電路10具有偵測接腳CS及充電開關控制接腳CO，偵測接腳CS用以偵測迴路中之充電電流；充電開關控制接腳CO則作為對電池BA充電時的保護。當充電電流異常時，充電開關M1斷開，此時順時針方向的充電路徑不導通，達到充電保護的效果。 Please refer to FIG. 1, which is a battery protection circuit 1 used in the prior art. The battery protection circuit 1 includes a battery protection integrated circuit 10, and the battery protection integrated circuit 10 has a detection pin CS and a charging switch control pin CO, and the detection pin CS is used to detect a charging current in the circuit; the charging switch controls Pin CO is used as protection for charging battery BA. When the charging current is abnormal, the charging switch M1 is turned off, and the charging path in the clockwise direction is not conductive at this time, thereby achieving the effect of charging protection.

請參照圖2，圖2為現有充電系統的架構圖。充電器2透過充電器正端PB+及負端PB-耦接至電池保護電路1，充電器2包含電源供應裝置(power regulator)20、充電開關22、放電開關24及微處理器(CPU)26。電源供應裝置20提供充電電流，並藉由微處理器26控制充電開關22及放電開關24的操作，以對電池BA進行充電操作。 Please refer to FIG. 2, which is a structural diagram of an existing charging system. The charger 2 is coupled to the battery protection circuit 1 through a positive terminal PB + and a negative terminal PB- of the charger. The charger 2 includes a power regulator 20, a charging switch 22, a discharging switch 24, and a microprocessor (CPU) 26. . The power supply device 20 provides a charging current and controls the operations of the charging switch 22 and the discharging switch 24 by the microprocessor 26 to perform a charging operation on the battery BA.

圖3繪示當電池在脈衝充電模式下進行充電時之充電電流的時序圖。如圖3所示，當電池在脈衝充電模式下進行充電時，其充電電流信號之週期T包含彼此間隔的定電流充電時間TP與不充電時間TD，藉以使得 電池內部之載子濃度能夠趨於平均分佈。相較於傳統的定電流充電模式，脈衝充電模式能夠在不縮短電池使用壽命之情況下減少電池充電所需的時間。 FIG. 3 is a timing diagram of a charging current when the battery is being charged in a pulse charging mode. As shown in FIG. 3, when the battery is charged in the pulse charging mode, the period T of the charging current signal includes a constant current charging time TP and a non-charging time TD spaced apart from each other, so that the carrier concentration inside the battery can approach Evenly distributed. Compared with the traditional constant current charging mode, the pulse charging mode can reduce the time required to charge the battery without shortening the battery life.

圖4繪示當電池在反射充電模式下進行充電時之充電電流的時序圖。如圖4所示，反射充電模式為脈衝充電模式的一種態樣，當電池在反射充電模式下進行充電時，充電電流之週期T除了包含彼此間隔的定電流充電時間TP與不充電時間TD之外，還包含一小段放電時間TN，藉由在充電時間的空檔進行些許放電之方式，使得電池內部之載子濃度能更快速地趨於平均分佈。相較於上述典型的脈衝充電模式，雖然反射充電模式會稍微犧牲一些能量，但可更有效地減緩電池之老化速度，以更加延長電池之使用壽命。 FIG. 4 is a timing diagram of a charging current when the battery is being charged in a reflective charging mode. As shown in FIG. 4, the reflective charging mode is a state of the pulse charging mode. When the battery is charged in the reflective charging mode, the period T of the charging current except In addition, it also contains a short period of discharge time TN. By performing a small discharge in the gap of the charging time, the carrier concentration in the battery can be more evenly distributed more quickly. Compared to the above-mentioned typical pulse charging mode, although the reflective charging mode will sacrifice a little energy, it can more effectively slow down the aging rate of the battery and further extend the battery life.

習知的脈衝充電/反射充電功能均是由充電器的微處理器負責控制。藉由充電器的充電開關控制輸出電流之輸出與否來達到脈衝充電的效果，以及利用充電器的放電開關抽載電流來達到對電池放電的反射充電的效果，雖然可利用充電器控制充電開關與放電開關達到脈衝充電/反射充電功能，但這些做法的電路複雜，製造成本亦相對提高。 The conventional pulse charging / reflective charging functions are controlled by the charger's microprocessor. The charger's charge switch controls the output current output to achieve the effect of pulse charging, and the charger's discharge switch draws the current to achieve the effect of reflective charging on battery discharge, although the charger can be used to control the charge switch And the discharge switch achieves the pulse charging / reflective charging function, but the circuit of these methods is complicated, and the manufacturing cost is relatively increased.

本發明提供一種電池保護積體電路、及其保護電路、保護方法，使得對電池進行充電保護的電池保護積體電路亦可實現脈衝充電及反射充電之功能，藉以改善先前技術所遭遇到之問題。 The invention provides a battery protection integrated circuit, a protection circuit and a protection method thereof, so that the battery protection integrated circuit for charging and protecting the battery can also realize the functions of pulse charging and reflection charging, thereby improving the problems encountered in the prior art. .

根據本發明之一較佳具體實施例為一種電池保護積體電路。電池保護積體電路耦接於電池與充電器之間，並耦接充電開關。電池 保護積體電路包含充電開關控制接腳、控制單元及電流感測接腳。充電開關控制接腳耦接充電開關。控制單元耦接充電開關控制接腳及電流感測接腳。電流感測接腳用以感測充電電流，當充電電流大於第一預設值且持續第一預設時間時，控制單元控制充電開關反覆導通第二預設時間與關閉第三預設時間，以對電池進行脈衝充電操作。上述第一預設值低於過電流保護電流預設值。 A preferred embodiment of the present invention is a battery protection integrated circuit. The battery protection integrated circuit is coupled between the battery and the charger, and is coupled to a charging switch. The battery protection integrated circuit includes a charge switch control pin, a control unit and a current sensing pin. The charge switch control pin is coupled to the charge switch. The control unit is coupled to the charging switch control pin and the current sensing pin. The current sensing pin is used to sense the charging current. When the charging current is greater than the first preset value and lasts for the first preset time, the control unit controls the charging switch to repeatedly turn on the second preset time and turn off the third preset time. To pulse charge the battery. The first preset value is lower than a preset value of the overcurrent protection current.

在本發明之一實施例中，電池保護積體電路還包含放電開關及放電接腳。放電接腳耦接放電開關。當電池保護積體電路提供脈衝充電操作時，電池保護積體電路還提供反射充電操作，以操作充電開關與放電開關。 In one embodiment of the present invention, the battery protection integrated circuit further includes a discharge switch and a discharge pin. The discharge pin is coupled to the discharge switch. When the battery protection integrated circuit provides a pulse charging operation, the battery protection integrated circuit also provides a reflective charging operation to operate the charging switch and the discharging switch.

在本發明之一實施例中，在反射充電操作中，控制單元控制充電開關與放電開關交替導通。 In one embodiment of the present invention, during the reflective charging operation, the control unit controls the charging switch and the discharging switch to be turned on alternately.

在本發明之一實施例中，在反射充電操作中，於一不充電期間，控制單元控制充電開關與放電開關同時關閉。 In one embodiment of the present invention, during the reflective charging operation, the control unit controls the charging switch and the discharging switch to be turned off simultaneously during a period of non-charging.

在本發明之一實施例中，當充電電流小於第二預設值且持續第二預設時間時，控制單元停止對電池進行脈衝充電操作。 In one embodiment of the present invention, when the charging current is less than the second preset value and continues for the second preset time, the control unit stops performing a pulse charging operation on the battery.

在本發明之一實施例中，電池保護積體電路還包含多個充電參數設定接腳，且每一充電參數設定接腳耦接一外部設定參數單元。 In one embodiment of the present invention, the battery protection integrated circuit further includes a plurality of charging parameter setting pins, and each charging parameter setting pin is coupled to an external setting parameter unit.

根據本發明之另一較佳具體實施例為一種電池保護電路。於此實施例中，電池保護電路耦接於電池與充電器之間。電池保護電路包含充電開關、外部放電開關、控制單元及電流感測單元。外部放電開關耦接於充電開關與電池之間。控制單元耦接外部放電開關及充電開關。電流感 測單元耦接控制單元，用以感測充電器對電池的充電電流。當充電電流大於第一預設值且持續第一預設時間時，控制單元控制充電開關反覆導通第二預設時間與關閉第三預設時間，以對電池進行脈衝充電操作。 Another preferred embodiment according to the present invention is a battery protection circuit. In this embodiment, the battery protection circuit is coupled between the battery and the charger. The battery protection circuit includes a charging switch, an external discharge switch, a control unit, and a current sensing unit. The external discharge switch is coupled between the charging switch and the battery. The control unit is coupled to an external discharge switch and a charging switch. The current sensing unit is coupled to the control unit to sense the charging current of the battery by the charger. When the charging current is greater than the first preset value and lasts for the first preset time, the control unit controls the charging switch to repeatedly turn on the second preset time and turn off the third preset time to perform a pulse charging operation on the battery.

根據本發明之另一較佳具體實施例為一種電池保護方法。於此實施例中，電池保護方法用以保護受充電器充電之電池。電池保護方法包含下列步驟：(a)感測電池的充電電流；(b)判斷充電電流是否大於第一預設值且持續第一預設時間；(c)若步驟(b)之判斷結果為是，控制充電開關反覆導通第二預設時間與關閉第三預設時間，以對電池進行脈衝充電操作。上述第一預設值低於一過電流保護電流預設值。 Another preferred embodiment according to the present invention is a battery protection method. In this embodiment, the battery protection method is used to protect the battery charged by the charger. The battery protection method includes the following steps: (a) sensing the charging current of the battery; (b) determining whether the charging current is greater than a first preset value for a first preset time; (c) if the judgment result of step (b) is If yes, control the charging switch to repeatedly turn on the second preset time and turn off the third preset time repeatedly to perform a pulse charging operation on the battery. The first preset value is lower than a preset value of the overcurrent protection current.

相較於先前技術，本發明之電池保護積體電路、及其保護電路、保護方法可以在不改變充電控制積體電路之電路架構的情況下，僅透過對電池進行充電保護的電池保護積體電路即可實現脈衝充電及反射充電之功能，不僅可有效減少充電控制積體電路之電路複雜度及製造成本，亦可增加電池保護積體電路之功能性。 Compared with the prior art, the battery protection integrated circuit, the protection circuit, and the protection method of the present invention can protect the integrated circuit by only charging the battery without changing the circuit structure of the charging control integrated circuit. The circuit can realize the functions of pulse charging and reflection charging, which can not only effectively reduce the circuit complexity and manufacturing cost of the charge control integrated circuit, but also increase the functionality of the battery protection integrated circuit.

關於本發明之優點與精神可以藉由以下的發明詳述及所附圖式得到進一步的瞭解。 The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

1、5‧‧‧電池保護電路 1. 5‧‧‧ battery protection circuit

10、50‧‧‧電池保護積體電路 10, 50‧‧‧ Battery protection integrated circuit

BA‧‧‧電池 BA‧‧‧ Battery

LO‧‧‧放電接腳 LO‧‧‧ discharge pin

VCC‧‧‧供電電壓接腳 VCC‧‧‧ supply voltage pin

VSS‧‧‧接地接腳 VSS‧‧‧ ground pin

DO‧‧‧放電開關控制接腳 DO‧‧‧Discharge switch control pin

CO‧‧‧充電開關控制接腳 CO‧‧‧Charge switch control pin

CS‧‧‧電流感測接腳 CS‧‧‧ Current Sensing Pin

2‧‧‧充電器 2‧‧‧ Charger

20‧‧‧電源供應裝置 20‧‧‧ Power supply device

22‧‧‧充電開關 22‧‧‧Charging switch

24‧‧‧放電開關 24‧‧‧ Discharge Switch

26‧‧‧微處理器 26‧‧‧Microprocessor

I_SET‧‧‧電流設定接腳 I_SET‧‧‧Current setting pin

ON_SET‧‧‧開啟時間設定接腳 ON_SET‧‧‧ Open time setting pin

OFF_SET‧‧‧關閉時間設定接腳 OFF_SET‧‧‧Off time setting pin

M1‧‧‧充電開關 M1‧‧‧Charging switch

M2‧‧‧外部放電開關 M2‧‧‧External discharge switch

M3‧‧‧放電開關 M3‧‧‧Discharge switch

GND‧‧‧接地端 GND‧‧‧ ground terminal

PB+‧‧‧充電器正端 PB + ‧‧‧ Charger positive end

PB-‧‧‧充電器負端 PB-‧‧‧ Charger negative terminal

RLO、RVCC、RCS、RISET、RON、ROFF‧‧‧電阻 R LO , R VCC , R CS , R ISET , R ON , R OFF ‧‧‧ resistance

CVCC‧‧‧電容 CVCC‧‧‧Capacitor

PTC‧‧‧正溫度係數熱敏電阻 PTC‧‧‧Positive Temperature Coefficient Thermistor

V1、V2‧‧‧充電電壓曲線 V1, V2‧‧‧Charging voltage curve

I1、I2‧‧‧充電電流曲線 I1, I2‧‧‧Charging current curve

T‧‧‧週期 T‧‧‧cycle

TP‧‧‧充電時間 TP‧‧‧Charging time

TD‧‧‧不充電時間 TD‧‧‧No charge time

TN‧‧‧放電時間 TN‧‧‧Discharge time

IP‧‧‧充電電流 IP‧‧‧Charging current

TH1‧‧‧過充電保護電壓閾值 TH1‧‧‧Overcharge protection voltage threshold

TH2‧‧‧過放電保護電壓閾值 TH2‧‧‧Over-discharge protection voltage threshold

TH4‧‧‧充電時之過電流保護電流閾值 TH4‧‧‧ Overcurrent protection current threshold during charging

TH5‧‧‧短路保護電壓閾值 TH5‧‧‧Short circuit protection voltage threshold

TH6‧‧‧放電時之過電流保護電流閾值 TH6‧‧‧ Overcurrent protection current threshold during discharge

500‧‧‧控制單元 500‧‧‧control unit

501‧‧‧時間產生單元 501‧‧‧time generating unit

502~503‧‧‧感測單元 502 ~ 503‧‧‧sensing unit

504‧‧‧時間設定單元 504‧‧‧Time setting unit

505‧‧‧電流設定單元 505‧‧‧Current Setting Unit

A1~A6‧‧‧放大器 A1 ~ A6‧‧‧amplifier

A7~A8‧‧‧驅動器 A7 ~ A8‧‧‧Driver

ICHA‧‧‧充電電流 I CHA ‧‧‧Charging current

IREFLEX_EN‧‧‧第一預設值 I REFLEX_EN ‧‧‧ the first default value

tTR_EN‧‧‧第一預設時間 t TR_EN ‧‧‧First preset time

IREFLEX_DIS‧‧‧第二預設值 I REFLEX_DIS ‧‧‧Second preset value

tTR_DIS‧‧‧第二預設時間 t TR_DIS ‧‧‧ Second preset time

tREFLEX_OFF‧‧‧不充電時間 t REFLEX_OFF ‧‧‧ No charge time

tREFLEX_ON‧‧‧充電時間 t REFLEX_ON ‧‧‧ Charging time

ICI0V‧‧‧充電時之過電流保護電流閾值 I CI0V ‧‧‧ Overcurrent protection current threshold during charging

IN‧‧‧放電電流 IN‧‧‧discharge current

S12~S16、S20~S36‧‧‧步驟 S12 ~ S16, S20 ~ S36‧‧‧step

圖1為先前技術所採用的電池保護積體電路之電路示意圖。 FIG. 1 is a circuit diagram of a battery protection integrated circuit used in the prior art.

圖2為現有充電系統架構圖。 FIG. 2 is a structural diagram of an existing charging system.

圖3繪示當電池在脈衝充電模式下進行充電時之充電電流的時序圖。 FIG. 3 is a timing diagram of a charging current when the battery is being charged in a pulse charging mode.

圖4繪示當電池在反射充電模式下進行充電時之充電電流的 時序圖。 FIG. 4 is a timing diagram of the charging current when the battery is being charged in the reflective charging mode.

圖5繪示根據本發明之一具體實施例之電池保護電路的示意圖。 FIG. 5 is a schematic diagram of a battery protection circuit according to a specific embodiment of the present invention.

圖6繪示圖5中之電池保護積體電路之一實施例。 FIG. 6 illustrates an embodiment of the battery protection integrated circuit in FIG. 5.

圖7分別繪示充電電流以及放電接腳LO電流、充電開關控制接腳CO及放電開關控制接腳DO之控制信號的時序圖。 FIG. 7 illustrates timing diagrams of the control signals of the charging current and the discharging pin LO current, the charging switch control pin CO, and the discharging switch control pin DO, respectively.

圖8A繪示不充電時間包含放電時間之時序圖。 FIG. 8A illustrates a timing diagram of the non-charging time including the discharging time.

圖8B繪示不充電時間接續於放電時間之後的時序圖。 FIG. 8B illustrates a timing diagram after the non-charging time continues after the discharging time.

圖9繪示根據本發明之另一具體實施例之電池保護方法的流程圖。 FIG. 9 is a flowchart of a battery protection method according to another embodiment of the present invention.

圖10繪示根據本發明之另一具體實施例之電池保護方法的流程圖。 FIG. 10 is a flowchart of a battery protection method according to another embodiment of the present invention.

根據本發明之一較佳具體實施例為一種電池保護電路。於此實施例中，電池保護電路耦接於電池與充電器之間，其功用除了對電池進行充電保護以避免電池造成毀損之外，亦可實現脈衝充電及/或反射充電之功能，以更有效地減緩電池之老化速度並延長電池之使用壽命。 A preferred embodiment of the present invention is a battery protection circuit. In this embodiment, the battery protection circuit is coupled between the battery and the charger. In addition to protecting the battery to prevent damage to the battery, the battery protection circuit can also implement pulse charging and / or reflective charging. Effectively slow down the aging rate of the battery and extend the life of the battery.

請參照圖5，圖5繪示此實施例中之電池保護電路的示意圖。 Please refer to FIG. 5, which illustrates a schematic diagram of a battery protection circuit in this embodiment.

如圖5所示，電池保護電路5耦接於電池BA與充電器的正負兩端PB+與PB-之間。電池保護電路5包含電池保護積體電路50、充電開關M1、外部放電開關M2、電阻RISET、RON、ROFF、RCS、RLO、RVCC及電容CVCC。電池保護積體電路50包含有多個充電參數設定接腳，例如電流設 定接腳I_SET、開啟時間設定接腳ON_SET及關閉時間設定接腳OFF_SET。 As shown in FIG. 5, the battery protection circuit 5 is coupled between the battery BA and the positive and negative terminals PB + and PB- of the charger. The battery protection circuit 5 includes a battery protection integrated circuit 50, a charging switch M1, an external discharge switch M2, resistors RISET, RON, ROFF, RCS, RLO, RVCC, and a capacitor CVCC. The battery protection integrated circuit 50 includes a plurality of charging parameter setting pins, such as a current setting pin I_SET, an on-time setting pin ON_SET, and an off-time setting pin OFF_SET.

在本發明之一實施例中，電池保護積體電路50中之每一個充電參數設定接腳耦接外部設定參數單元(例如電流設定接腳I_SET耦接外部的電阻RISET；開啟時間設定接腳ON_SET耦接外部的電阻RON，依此類推)，以設定相關的充電參數設定。在其他實施利中，亦可透過震盪器或電流鏡等元件將充電參數製作於IC內部。 In one embodiment of the present invention, each charging parameter setting pin in the battery protection integrated circuit 50 is coupled to an external setting parameter unit (for example, the current setting pin I_SET is coupled to an external resistor RISET; the on-time setting pin ON_SET Coupling with the external resistor RON, and so on) to set the relevant charging parameter settings. In other implementations, the charging parameters can also be made inside the IC through components such as oscillators or current mirrors.

於此實施例中，放電接腳LO透過電阻RLO耦接至充電器的正端PB+與電池BA之間；供電電壓接腳VCC透過電阻RVCC耦接至電池BA之正端；接地接腳VSS耦接至接地端GND與電池BA之負端；放電開關控制接腳DO耦接外部放電開關M2之閘極，並且外部放電開關M2設置於充電器的負端PB-與電池BA之間；充電開關控制接腳CO耦接充電開關M1之閘極，並且充電開關M1設置於充電器的負端PB-與外部放電開關M2之間；電流感測接腳CS透過電阻RCS耦接至充電器的負端PB-與充電開關M1之間；電流設定接腳I_SET透過電阻RISET耦接至接地端GND；開啟時間設定接腳ON_SET透過電阻RON耦接至接地端GND；關閉時間設定接腳OFF_SET透過電阻ROFF耦接至接地端GND。電容CVCC之一端耦接至供電電壓接腳VCC與電阻RVCC之間。 In this embodiment, the discharge pin LO is coupled between the positive terminal PB + of the charger and the battery BA through the resistor RLO; the supply voltage pin VCC is coupled to the positive terminal of the battery BA through the resistor RVCC; the ground pin VSS is coupled Connect to the ground terminal GND and the negative terminal of the battery BA; the discharge switch control pin DO is coupled to the gate of the external discharge switch M2, and the external discharge switch M2 is arranged between the negative terminal PB- of the charger and the battery BA; the charging switch The control pin CO is coupled to the gate of the charging switch M1, and the charging switch M1 is disposed between the negative terminal PB- of the charger and the external discharge switch M2; the current sensing pin CS is coupled to the negative of the charger through a resistor RCS. Between the terminal PB- and the charging switch M1; the current setting pin I_SET is coupled to the ground terminal GND through the resistor RISET; the on-time setting pin ON_SET is coupled to the ground terminal GND through the resistor RON; the off-time setting pin OFF_SET is connected to the resistor ROFF Coupled to ground GND. One terminal of the capacitor CVCC is coupled between the supply voltage pin VCC and the resistor RVCC.

請參照圖6。圖6繪示圖5中之電池保護積體電路50之一實施例。如圖6所示，電池保護積體電路50除了包含放電接腳LO、供電電壓接腳VCC、接地接腳VSS、放電開關控制接腳DO、充電開關控制接腳CO、電流感測接腳CS、電流設定接腳I_SET、開啟時間設定接腳ON_SET及關閉時間設定接腳OFF_SET等充電參數設定接腳之外，還包含控制單元500、時間產 生單元501、感測單元502~503、時間設定單元504、電流設定單元505、放電開關M3及放大器A1~A6。 Please refer to Figure 6. FIG. 6 illustrates an embodiment of the battery protection integrated circuit 50 in FIG. 5. As shown in FIG. 6, the battery protection integrated circuit 50 includes a discharge pin LO, a supply voltage pin VCC, a ground pin VSS, a discharge switch control pin DO, a charge switch control pin CO, and a current sensing pin CS. In addition to the charging parameter setting pins such as the current setting pin I_SET, the on-time setting pin ON_SET, and the off-time setting pin OFF_SET, it also includes a control unit 500, a time generating unit 501, a sensing unit 502-503, and a time setting unit. 504. The current setting unit 505, the discharge switch M3, and the amplifiers A1 to A6.

控制單元500分別耦接時間產生單元501、感測單元502~503、時間設定單元504及放大器A1~A6的輸出端；驅動單元501分別透過驅動器A7及A8耦接至放電開關控制接腳DO及充電開關控制接腳CO；感測單元502耦接至電流感測接腳CS及放大器A3~A6、A8；感測單元503耦接至供電電壓接腳VCC及放大器A1~A2；時間設定單元504分別耦接開啟時間設定接腳ON_SET及關閉時間設定接腳OFF_SET；電流設定單元505耦接電流設定接腳I_SET及放大器A3；放電開關M3耦接於放電接腳LO與接地端GND之間，並且放電開關M3的閘極耦接控制單元500。 The control unit 500 is respectively coupled to the output terminals of the time generating unit 501, the sensing units 502 to 503, the time setting unit 504, and the amplifiers A1 to A6; the driving unit 501 is respectively coupled to the discharge switch control pins DO and A through the drivers A7 and A8. Charging switch control pin CO; sensing unit 502 is coupled to current sensing pin CS and amplifiers A3 ~ A6, A8; sensing unit 503 is coupled to supply voltage pin VCC and amplifiers A1 ~ A2; time setting unit 504 The ON time setting pin ON_SET and the OFF time setting pin OFF_SET are respectively coupled; the current setting unit 505 is coupled to the current setting pin I_SET and the amplifier A3; the discharge switch M3 is coupled between the discharge pin LO and the ground terminal GND, and The gate of the discharge switch M3 is coupled to the control unit 500.

放大器A1~A2之正輸入端+耦接感測單元503，且負輸入端-分別接收不同的電壓相關閾值TH1~TH2，例如過充電保護電壓閾值(Over-charge threshold)或過放電保護電壓閾值(Over-discharge threshold)；放大器A3之正輸入端+耦接電流感測接腳CS且負輸入端-耦接電流設定單元505；放大器A4~A5之正輸入端+耦接電流感測接腳CS，且負輸入端-分別接收不同的電流相關閾值TH4~TH6，例如充電時之過電流保護電流閾值(Over-current threshold at charging)、短路保護電壓閾值(Short-circuit protection threshold)、放電時之過電流保護電流閾值(Over-current threshold at discharging)或本案的第一預設值及第二預設值。 The positive inputs of the amplifiers A1 ~ A2 + are coupled to the sensing unit 503, and the negative inputs-receive different voltage-dependent thresholds TH1 ~ TH2, such as over-charge threshold or over-discharge protection threshold (Over-discharge threshold); positive input of amplifier A3 + coupled current sense pin CS and negative input-coupled to current setting unit 505; positive input of amplifier A4 ~ A5 + coupled current sense pin CS, and negative input terminals-receive different current-related thresholds TH4 ~ TH6, such as over-current threshold at charging, short-circuit protection threshold, and discharge Over-current threshold at discharging or the first preset value and the second preset value in this case.

控制單元500會先對電流感測接腳CS感測到的充電電流與第一預設值進行比較，以判斷充電電流是否大於第一預設值。第一預設值會低於充電時之過電流保護電流閩值。例如圖7中之IREFLEX_EN可以是第 一預設值，且ICI0V可以是充電時之過電流保護電流閾值，但不以此為限。 The control unit 500 first compares the charging current sensed by the current sensing pin CS with a first preset value to determine whether the charging current is greater than the first preset value. The first preset value will be lower than the overcurrent protection current value during charging. For example, IREFLEX_EN in FIG. 7 can be the first preset value, and ICI0V can be the overcurrent protection current threshold during charging, but it is not limited to this.

若電流感測接腳CS感測到的充電電流大於第一預設值，則控制單元500開始進一步判斷充電電流大於第一預設值之狀態是否持續第一預設時間。若充電電流大於第一預設值之狀態已持續第一預設時間，則控制單元500會控制充電開關M1反覆導通第二預設時間(On-time)與關閉第三預設時間(Off-time)，以對電池BA進行脈衝充電操作。 If the charging current sensed by the current sensing pin CS is greater than the first preset value, the control unit 500 starts to further determine whether the state in which the charging current is greater than the first preset value continues for the first preset time. If the state that the charging current is larger than the first preset value has continued for the first preset time, the control unit 500 controls the charging switch M1 to be turned on for the second preset time (On-time) and turned off for the third preset time (Off- time) to perform a pulse charging operation on the battery BA.

當電池保護積體電路50對電池BA進行脈衝充電操作時，電池保護積體電路50還會透過放電開關M3之開啟或關閉提供反射充電操作，並利用與放電接腳LO耦接的外部電阻RLO決定放電電流大小。 When the battery protection integrated circuit 50 performs a pulse charging operation on the battery BA, the battery protection integrated circuit 50 also provides a reflective charging operation through the opening or closing of the discharge switch M3, and uses an external resistor RLO coupled to the discharge pin LO. Determine the size of the discharge current.

請參考圖7，當圖7中之充電電流ICHA第一次大於第一預設值IREFLEX_EN時，由於控制單元500判定充電電流ICHA大於第一預設值IREFLEX_EN之狀態所持續的時間小於第一預設時間tTR_EN，故無法觸發反射充電模式。此時控制單元500並不會進行反射充電操作。第一預設時間tTR_EN可以是50毫秒(msec)~2秒(sec)，但不以此為限。 Please refer to FIG. 7. When the charging current ICHA in FIG. 7 is greater than the first preset value IREFLEX_EN for the first time, the control unit 500 determines that the charging current ICHA is greater than the first preset value IREFLEX_EN. Set the time tTR_EN, so the reflective charging mode cannot be triggered. At this time, the control unit 500 does not perform the reflective charging operation. The first preset time tTR_EN may be 50 milliseconds (msec) to 2 seconds (sec), but is not limited thereto.

當圖7中之充電電流ICHA第二次大於第一預設值IREFLEX_EN時，由於控制單元500判定充電電流ICHA大於第一預設值IREFLEX_EN之狀態所持續的時間已達第一預設時間tTR_EN，已可觸發反射充電模式。此時，控制單元500開始進行反射充電操作。 When the charging current ICHA in FIG. 7 is greater than the first preset value IREFLEX_EN for the second time, since the control unit 500 determines that the state in which the charging current ICHA is greater than the first preset value IREFLEX_EN has reached the first preset time tTR_EN, Reflective charging mode can be triggered. At this time, the control unit 500 starts a reflection charging operation.

在脈衝充電操作及反射充電操作中，控制單元500比較將電流感測接腳CS感測到的充電電流與第二預設值，以判斷充電電流是否小於第二預設值。當充電電流小於第二預設值時，控制單元500開始判斷充電電流小於第二預設值之狀態是否持續第四預設時間。若充電電流小於第二預 設值之狀態已持續第四預設時間，則控制單元500會停止對電池BA進行脈衝充電操作及反射充電操作。 In the pulse charging operation and the reflective charging operation, the control unit 500 compares the charging current sensed by the current sensing pin CS with a second preset value to determine whether the charging current is less than the second preset value. When the charging current is less than the second preset value, the control unit 500 starts to determine whether the state in which the charging current is less than the second preset value continues for a fourth preset time. If the state that the charging current is smaller than the second preset value has continued for the fourth preset time, the control unit 500 stops the pulse charging operation and the reflective charging operation on the battery BA.

舉例而言，當圖7中之充電電流ICHA在脈衝充電操作中第一次小於第二預設值IREFLEX_DIS時，控制單元500判定充電電流ICHA小於第一預設值IREFLEX_DIS之狀態所持續的時間小於第二預設時間tTR_DIS，代表電池BA尚未被充飽電。此時控制單元500持續對電池BA進行脈衝充電操作及反射充電操作。第二預設時間tTR_DIS可以是50毫秒(msec)~2秒(sec)，但不以此為限。 For example, when the charging current ICHA in FIG. 7 is smaller than the second preset value IREFLEX_DIS for the first time in the pulse charging operation, the control unit 500 determines that the state in which the charging current ICHA is less than the first preset value IREFLEX_DIS is less than The second preset time tTR_DIS represents that the battery BA has not been fully charged. At this time, the control unit 500 continuously performs a pulse charging operation and a reflective charging operation on the battery BA. The second preset time tTR_DIS may be 50 milliseconds (msec) to 2 seconds (sec), but is not limited thereto.

當圖7中之充電電流ICHA在脈衝充電操作中第二次小於第二預設值IREFLEX_DIS時，控制單元500判定充電電流ICHA小於第二預設值IREFLEX_DIS之狀態所持續的時間已達第二預設時間tTR_DIS，代表電池BA已被充飽電。此時，控制單元500停止對電池BA進行脈衝充電操作及反射充電操作，然後，充電器執行下一個充電操作程序，即定電壓充電模式。 When the charging current ICHA in FIG. 7 is smaller than the second preset value IREFLEX_DIS for the second time in the pulse charging operation, the control unit 500 determines that the state in which the charging current ICHA is less than the second preset value IREFLEX_DIS has reached the second preset time. Set time tTR_DIS to indicate that battery BA has been fully charged. At this time, the control unit 500 stops the pulse charging operation and the reflective charging operation on the battery BA, and then, the charger executes the next charging operation procedure, that is, the constant voltage charging mode.

於前述實施例之反射充電操作中，放電開關M3之時序控制係與充電開關M1之時序同步但彼此反相，亦即當充電開關M1開啟(導通)時，放電開關M3就會關閉(不導通)，反之亦然。如圖7所示，在時間tREFLEX_OFF區間，電池保護積體電路50不對電池BA進行充電，此時，充電開關M1關閉(不導通)，而控制單元500控制放電開關M3導通，使得電池BA透過放電接腳LO與放電開關M3進行放電。在時間tREFLEX_ON區間，控制單元500控制充電開關M1導通，以對電池BA進行充電，此時，控制單元500控制放電開關M3關閉，電池BA無法透過放電接腳LO放電。 In the reflective charging operation of the foregoing embodiment, the timing control of the discharge switch M3 is synchronized with the timing of the charge switch M1 but is opposite to each other, that is, when the charge switch M1 is turned on (conducted), the discharge switch M3 is turned off (not conductive). ),vice versa. As shown in FIG. 7, during the time tREFLEX_OFF interval, the battery protection integrated circuit 50 does not charge the battery BA. At this time, the charging switch M1 is turned off (non-conducting), and the control unit 500 controls the discharging switch M3 to be turned on, so that the battery BA is discharged through discharge. The pin LO is discharged with the discharge switch M3. During the time period tREFLEX_ON, the control unit 500 controls the charge switch M1 to be turned on to charge the battery BA. At this time, the control unit 500 controls the discharge switch M3 to be turned off, and the battery BA cannot be discharged through the discharge pin LO.

於實際應用的反射充電操作中，除了上述實施例之外，控制 單元500亦可控制充電開關M1與放電開關M3交替導通，或控制充電開關M1與放電開關M3於一不充電期間內同時關閉，但不以此為限。 In practical application of the reflective charging operation, in addition to the above embodiments, the control unit 500 may also control the charging switch M1 and the discharging switch M3 to be turned on alternately, or control the charging switch M1 and the discharging switch M3 to be turned off simultaneously during a period of non-charging. But not limited to this.

如圖8A所示，假設對電池充電之充電電流為正且對電池放電之放電電流為負。在反射充電模式下，其充電電流之週期T包含彼此間隔的定電流充電時間TP與不充電時間TD。在充電時間TP內，充電開關M1導通以對電池進行充電；在不充電時間TD內，充電開關M1斷開以停止對電池進行充電。在不充電時間TD包含一小段放電時間TN，電池透過放電接腳LO與放電開關M3進行放電。 As shown in FIG. 8A, it is assumed that the charging current for charging the battery is positive and the discharging current for discharging the battery is negative. In the reflective charging mode, the period T of the charging current includes a constant-current charging time TP and a non-charging time TD spaced apart from each other. During the charging time TP, the charging switch M1 is turned on to charge the battery; during the non-charging time TD, the charging switch M1 is turned off to stop charging the battery. The non-charging time TD includes a short period of discharge time TN, and the battery is discharged through the discharge pin LO and the discharge switch M3.

如圖8B所示，在反射充電模式下，充電電流之週期T包含定電流充電時間TP、不充電時間TD及一小段放電時間TN。在充電時間TP內，充電開關M1導通以對電池進行充電；在不充電時間TD內，充電開關M1斷開以停止對電池進行充電。放電接腳LO在充電時間之外的一小段放電時間TN內對電池進行些許放電，使得電池內部之載子濃度能更快速地趨於平均分佈。 As shown in FIG. 8B, in the reflective charging mode, the period T of the charging current includes a constant current charging time TP, a non-charging time TD, and a short period of discharging time TN. During the charging time TP, the charging switch M1 is turned on to charge the battery; during the non-charging time TD, the charging switch M1 is turned off to stop charging the battery. The discharge pin LO discharges the battery slightly within a short discharge time TN other than the charging time, so that the carrier concentration inside the battery can be more evenly distributed more quickly.

根據本發明之另一較佳具體實施例為一種電池保護方法，適用於電池模組中的電池保護電路，該電池模組包含電池及充電開關，該電池耦接該充電開關。電池保護方法用以保護受充電器充電之電池，電池保護方法包含下列步驟。 According to another preferred embodiment of the present invention, a battery protection method is applicable to a battery protection circuit in a battery module. The battery module includes a battery and a charging switch, and the battery is coupled to the charging switch. The battery protection method is used to protect the battery charged by the charger. The battery protection method includes the following steps.

步驟S12：感測電池的充電電流；步驟S14：判斷充電電流是否大於第一預設值且持續第一預設時間；以及步驟S16：若步驟S14之判斷結果為是，控制充電開關以對電 池進行脈衝充電操作。於步驟S16中，電池保護方法還會提供反射充電操作，以操作充電開關與放電開關。 Step S12: sensing the charging current of the battery; step S14: determining whether the charging current is greater than the first preset value for the first preset time; and step S16: if the result of the determination in step S14 is yes, controlling the charging switch to Perform pulse charging operation. In step S16, the battery protection method further provides a reflective charging operation to operate the charging switch and the discharging switch.

接下來將透過一實施例來說明本案之電池保護方法的詳細操作流程。如圖10所示，電池保護方法會先執行步驟S20，根據外部電阻決定電流上限與充電開關之導通時間。接著執行步驟S22，判斷充電電流是否為正。 Next, an embodiment will be used to explain the detailed operation process of the battery protection method in this case. As shown in FIG. 10, the battery protection method first executes step S20, and determines the upper limit of the current and the on-time of the charging switch according to the external resistance. Then step S22 is executed to determine whether the charging current is positive.

若步驟S22之判斷結果為是，表示電池處於充電狀態，則執行步驟S24，由電流設定接腳根據其外部電阻設定充電電流，並進入預充電模式。於步驟S26中，電池保護方法會感測充電電流並判斷充電電流是否大於第一預設值。第一預設值會低於充電時之過電流保護電流閾值。 If the judgment result of step S22 is YES, indicating that the battery is in a charging state, step S24 is executed, the current setting pin sets a charging current according to its external resistance, and enters a precharge mode. In step S26, the battery protection method senses the charging current and determines whether the charging current is greater than a first preset value. The first preset value will be lower than the overcurrent protection current threshold during charging.

若步驟S26之判斷結果為是，則執行步驟S28，判斷充電電流大於第一預設值之狀態的持續時間是否大於第一預設時間。若步驟S26及S28之判斷結果為否，則電池保護方法均會回到步驟S24。 If the determination result of step S26 is yes, then step S28 is performed to determine whether the duration of the state in which the charging current is greater than the first preset value is greater than the first preset time. If the judgment results of steps S26 and S28 are negative, the battery protection method will return to step S24.

若步驟S28之判斷結果為是，則執行步驟S30，進入反射充電模式，由開啟時間設定接腳及關閉時間設定接腳分別根據其外部電阻設定開啟時間及關閉時間，以操作充電開關。 If the judgment result of step S28 is yes, then step S30 is executed to enter the reflective charging mode. The on-time setting pin and the off-time setting pin respectively set the on time and the off time according to their external resistances to operate the charging switch.

於步驟S32中，電池保護方法會判斷充電電流是否小於第二預設值。若步驟S32之判斷結果為是，則執行步驟S34，判斷充電電流小於第二預設值之狀態的持續時間是否大於第二預設時間。若步驟S34之判斷結果為是，則執行步驟S36，結束反射充電模式。若步驟S32及S34之判斷結果為否，則電池保護方法均會回到步驟S30。 In step S32, the battery protection method determines whether the charging current is less than a second preset value. If the determination result of step S32 is YES, step S34 is executed to determine whether the duration of the state in which the charging current is less than the second preset value is greater than the second preset time. If the determination result of step S34 is YES, step S36 is executed to end the reflection charging mode. If the judgment results of steps S32 and S34 are negative, the battery protection method will return to step S30.

藉由以上較佳具體實施例之詳述，係希望能更加清楚描述本 發明之特徵與精神，而並非以上述所揭露的較佳具體實施例來對本發明之範疇加以限制。相反地，其目的是希望能涵蓋各種改變及具相等性的安排於本發明所欲申請之專利範圍的範疇內。 With the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present invention may be more clearly described, rather than limiting the scope of the present invention with the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the patents to be applied for in the present invention.

Claims (17)

一種電池保護積體電路，耦接於一電池與一充電器之間，並耦接一充電開關，該電池保護積體電路包含：一充電開關控制接腳，耦接該充電開關；一控制單元，耦接該充電開關控制接腳；以及一電流感測接腳，耦接該控制單元，用以感測一充電電流；其中，當該充電電流大於一第一預設值且持續一第一預設時間時，該控制單元控制該充電開關導通一第二預設時間與關閉一第三預設時間，以對該電池進行一脈衝充電操作；其中，該第一預設值低於一過電流保護電流預設值。     A battery protection integrated circuit is coupled between a battery and a charger, and is coupled to a charging switch. The battery protection integrated circuit includes: a charging switch control pin coupled to the charging switch; a control unit Is coupled to the charging switch control pin; and a current sensing pin is coupled to the control unit to sense a charging current; wherein, when the charging current is greater than a first preset value and continues for a first During the preset time, the control unit controls the charging switch to be turned on for a second preset time and turned off for a third preset time to perform a pulse charging operation on the battery; wherein the first preset value is lower than one pass Current protection current preset value.     如申請專利範圍第1項所述之電池保護積體電路，還包含：一放電開關；以及一放電接腳，耦接該放電開關；其中，當該電池保護積體電路提供該脈衝充電操作時，該電池保護積體電路還提供一反射充電操作，以操作該充電開關與該放電開關。     The battery protection integrated circuit described in item 1 of the patent application scope further includes: a discharge switch; and a discharge pin coupled to the discharge switch; wherein, when the battery protection integrated circuit provides the pulse charging operation The battery protection integrated circuit also provides a reflective charging operation to operate the charging switch and the discharging switch.     如申請專利範圍第2項所述之電池保護積體電路，其中在該反射充電操作中，該控制單元控制該充電開關與該放電開關交替導通。     The battery protection integrated circuit according to item 2 of the scope of patent application, wherein in the reflective charging operation, the control unit controls the charging switch and the discharging switch to be turned on alternately.     如申請專利範圍第2項所述之電池保護積體電路，其中在該反射充電操作中，於一不充電期間，該控制單元控制該充電開關與該放電開關同時關閉。     The battery protection integrated circuit according to item 2 of the scope of patent application, wherein in the reflective charging operation, the control unit controls the charging switch and the discharging switch to be turned off simultaneously during a period of non-charging.     如申請專利範圍第1項所述之電池保護積體電路，其中當該充電電流小於一第二預設值且持續一第四預設時間時，該控制單元停止對該電池進行該脈衝充電操作。     The battery protection integrated circuit according to item 1 of the scope of patent application, wherein when the charging current is less than a second preset value and lasts a fourth preset time, the control unit stops performing the pulse charging operation on the battery .     如申請專利範圍第1項所述之電池保護積體電路，還包含：多個充電參數設定接腳，且每一充電參數設定接腳耦接一外部設定參數單元。     The battery protection integrated circuit described in item 1 of the scope of patent application, further includes: a plurality of charging parameter setting pins, and each charging parameter setting pin is coupled to an external setting parameter unit.     一種電池保護電路，耦接於一電池與一充電器之間，該電池保護電路包含：一充電開關；一外部放電開關，串接該充電開關，且耦接於該充電開關與該電池之間；一控制單元，耦接該外部放電開關及該充電開關；以及一電流感測單元，耦接該控制單元，用以感測該充電器對該電池的一充電電流；其中，當該充電電流大於一第一預設值且持續一第一預設時間時，該控制單元控制該充電開關反覆導通第二預設時間與關閉第三預設時間，以對該電池進行一脈衝充電操作。     A battery protection circuit is coupled between a battery and a charger. The battery protection circuit includes: a charging switch; an external discharge switch connected in series with the charging switch, and coupled between the charging switch and the battery A control unit coupled to the external discharge switch and the charging switch; and a current sensing unit coupled to the control unit for sensing a charging current of the battery from the charger; wherein, when the charging current When it is greater than a first preset value and lasts for a first preset time, the control unit controls the charging switch to repeatedly turn on the second preset time and turn off the third preset time to perform a pulse charging operation on the battery.     如申請專利範圍第7項所述之電池保護電路，還包含一放電開關，耦接於該電池與接地之間，其中當該電池保護電路提供該脈衝充電操作時，該控制單元控制該放電開關與該充電開關，以提供一反射充電操作。     The battery protection circuit according to item 7 of the scope of patent application, further comprising a discharge switch coupled between the battery and ground, wherein the control unit controls the discharge switch when the battery protection circuit provides the pulse charging operation. And the charging switch to provide a reflective charging operation.     如申請專利範圍第8項所述之電池保護電路，其中在該反射充電操作中，該控制單元控制該充電開關與該放電開關交替導通。     The battery protection circuit according to item 8 of the scope of patent application, wherein in the reflective charging operation, the control unit controls the charging switch and the discharging switch to be turned on alternately.     如申請專利範圍第8項所述之電池保護電路，其中在該反射充電操作中，於一不充電期間，該控制單元控制該充電開關與該放電開關同時關閉。     The battery protection circuit according to item 8 of the scope of patent application, wherein in the reflective charging operation, the control unit controls the charging switch and the discharging switch to be turned off simultaneously during a period of non-charging.     如申請專利範圍第7項所述之電池保護電路，其中當該充電電流小於一第二預設值且持續一第四預設時間時，該控制單元停止對該電池進行該脈衝充電操作。     The battery protection circuit according to item 7 of the scope of patent application, wherein when the charging current is less than a second preset value and continues for a fourth preset time, the control unit stops performing the pulse charging operation on the battery.     如申請專利範圍第7項所述之電池保護電路，其中該第一預設值低於一過電流保護電流預設值。     The battery protection circuit according to item 7 of the scope of patent application, wherein the first preset value is lower than a preset value of the overcurrent protection current.     一種電池保護方法，適用於一電池模組中的電池保護電路，該電池 模組包含一電池及一充電開關，其中該電池耦接該充電開關，該電池保護方法包含下列步驟：(a)感測該電池的一充電電流；(b)判斷該充電電流是否大於一第一預設值且持續一第一預設時間；以及(c)若步驟(b)之判斷結果為是，控制該充電開關反覆導通一第二預設時間與關閉一第三預設時間，以對該電池進行一脈衝充電操作；其中，該第一預設值低於一過電流保護電流預設值。     A battery protection method is applicable to a battery protection circuit in a battery module. The battery module includes a battery and a charging switch. The battery is coupled to the charging switch. The battery protection method includes the following steps: (a) sensing Measuring a charging current of the battery; (b) determining whether the charging current is greater than a first preset value for a first preset time; and (c) if the judgment result of step (b) is yes, controlling the charging The switch repeatedly turns on a second preset time and turns off a third preset time to perform a pulse charging operation on the battery; wherein the first preset value is lower than a preset value of the overcurrent protection current.     如申請專利範圍第13項所述之電池保護方法，其中於步驟(c)中，該電池保護方法還提供一反射充電操作，以操作一放電開關，其中該放電開關耦接於該電池與一接地端之間。     The battery protection method according to item 13 of the patent application scope, wherein in step (c), the battery protection method further provides a reflective charging operation to operate a discharge switch, wherein the discharge switch is coupled to the battery and a Between grounds.     如申請專利範圍第14項所述之電池保護方法，其中在該反射充電操作中，該電池保護方法控制該充電開關與該放電開關交替導通。     The battery protection method according to item 14 of the scope of patent application, wherein in the reflective charging operation, the battery protection method controls the charging switch and the discharge switch to be turned on alternately.     如申請專利範圍第14項所述之電池保護方法，其中在該反射充電操作中，於一不充電期間，該電池保護方法控制該充電開關與該放電開關同時關閉。     The battery protection method according to item 14 of the scope of patent application, wherein in the reflective charging operation, the battery protection method controls the charging switch and the discharging switch to be turned off simultaneously during a period of non-charging.     如申請專利範圍第13項所述之電池保護方法，其中當該充電電流小於一第二預設值且持續一第二預設時間時，該電池保護方法停止對該電池進行該脈衝充電操作。     The battery protection method according to item 13 of the patent application, wherein when the charging current is less than a second preset value and continues for a second preset time, the battery protection method stops performing the pulse charging operation on the battery.    
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