201123680 六、發明說明： 【發明所屬之技術領域】 本發明涉及一種充電電池組控制電路，尤其涉及一種充電 電池的過充電保護裝置。 【先前技術】 習知作為高容量可充電電池的鐘離子電池，其由於沒有圮 憶效應而成為理想的充電電池。當链離子電池應用於電子產 品、電機或車輛等動力產品中時，往往需要將多節鋰離子電池 串聯使用，以達到動力產品所需的電壓。例如，在筆記型電腦 上，通常採用3〜4節鋰離子電池串聯起來形成u lv或14 8v 的電池系統。然而，串聯電池不可避免地由於電池單體的電 壓、電氣特性差異，會出現每組串聯電池中每個電池的電壓和 谷置皆有差異，該種差異經過多次的充放電迴圈後會變得越來 越明顯，從而嚴重影響串聯電池系統的壽命和可靠性。尤其是 採用目前常用的快速充電器進行充電時，此種影響更加明顯= 持續大電流的充電極易造成其中某些電池電壓過高，長期處於 過充狀態，而其他電池電壓則無法充滿。這樣，使得整體=聯 電池的容量整體下降。而且’會造成過充的電池出現老化現 象，壽命大大降低。 故此，基於此問題，通常在多節電池串聯系統中一般會增 =平衡控制電路，以平衡每組電池中單體電芯之間的電壓，^ 尚電池系統的迴圏壽命和可靠性。 請參考第—圖，目前常用的充電電池的過充電保護裝置 3，—-般_的平衡㈣祕⑽為採職動的平衡方式，、即 在母郎電芯上並聯-個電阻和一個開關，開關由平衡控制電路 100控制’平衡控制電路100會對每節電芯的電壓進行監控， 201123680 ▲發現其中-個電芯的„異常後，即對開關進行控制，從而 控制充電控制電路綱的料。具體為，若發現其中—個電芯 的電壓過高時，將和該電芯並聯的開關閉合，貝,卜會有一部分 的充電電料過相制電阻被旁路掉，從而減緩㈣芯的充電 速度。 此種被動平衡方式能實現一定的平衡效果，惟，其多餘的 能量（電壓高的電芯存儲了多餘能量）皆通過平衡電阻以熱能 的方式消耗掉，效果不佳，而且容易造成平衡電阻過度發熱， 引起電池使用時溫度過高，安全性欠佳。 【發明内容】 本發明的主要目的係針對上述f知技術存在之缺陷提供 -種充電電池的過充電保護裝置，其可實現電池由大電流快速 充電轉至小電流慢速充電’從而平衡多節電池之間的電壓及容 里，防止電池過充，從而延長電池的使用壽命及提高電池的安 全可靠性。 為實現上述目的，本發明提供一種充電電池的過充電保護 裝置，其包括檢測電路、充電控制電路、平衡控制電路及保護 芯片。檢測電路及保護芯片的輸入端分別與電池連接，以對電 池電壓進行檢測，並分別輸出不同的檢測信號。充電控制電路 的輸入端與保護芯片的輸出端連接，並根據相應的檢測信號而 進行慢速充電動作。平衡控制電路與檢測電路的輸出端連接， 並根據相應的檢測信號啟動而進行平衡充電動作。 如上所述，本發明充電電池的過充電保護裝置能使充電電 池在進行大電流的快速充電，其電壓達一定值後，平衡控制電 路根據相應的檢測信號而啟動，並使充電控制電路進入小電流 的慢速充電’從而使充電模式從大電流充電轉為小電流充電， 201123680 使得電池組中較高電壓的電池持續消耗能量，而其他電池則進 行小電流充電以持續增加能量，從而使多節充電電池之間的電 壓及容量趨於平衡，防止了電池過飽和充電，從而延長電池的 使用壽命及提高電池的安全可靠性。 【實施方式】 為詳細說明本發明之技術内容、構造特徵、所達成的目的 及功效’以下茲例舉實施例並配合圖式詳予說明。 請參閱第二圖至第四圖，本發明充電電池的過充電保護裝 置1的第一個實施例包括檢測電路10、充電控制電路2〇、平 衡控制電路30及保護芯片5(H其中，檢測電路丨〇與保護芯 片50分別用於檢測多節電池間的電壓狀況並輸出不同的檢測 信號，充電控制電路20與保護芯片5〇連接，並根據相應的檢 測信號而進行慢速充電動作’平衡控制電路3〇與檢測電路⑺ 連接，並根據相應的檢測信號啟動而進行平衡充電動作。 如圖所不，檢測電路1〇包括差動放大電路Η '比較電路 =及基準電壓源15。本實施例中，該基準㈣源丨5採用助】 芯片，其為檢測電路1〇的比較電路13提供一基準電壓值該 ^準電遷值可人為調節。差動放大電路u包括複數差動放大 器，比較電路13包括複數比較器，差動放大器與比較器的個 數因充電電池的節數不同而相應設定，本實施财，充電電 池、差動放大器及比較器的個數為4。差動放大器的兩輸入端 分，與兩節電池連接，以比較兩節電池之間的電遂差，差動放 ^器的輸出端與比較器的一輸入端連接，以將差動放大器的比 果二至比^。比較器的另—輸人端與基準電壓源15相 比較β將差動放大器輸出的結果電恩與基準電塵值進行比 較，並輸出不同的檢測信號。具體地，若差動放大器輸出的結 201123680 果㈣低於基準電難時，則比較電路13關閉平衡控制電路 30,若差動放大器輸出的結果電麗高於基準電屢值時則比較 • 電路13啟動平衡控制電路30。 充電控制電路2G包括快速充電控制開關2卜慢速充電控 制開關23及控制開關25。本實施例中採用的保護芯片⑽為 〇簡2芯片。該保護芯片5〇與電池及充電控制電路連接， 以對電路中發生的過麼、過電流、過電麼情況進行監控檢測。 保護怎片50檢測各節電池的電壓，若其中一節電池的電壓高 ^基準電壓值時，保護怎片5〇的第一輸出端CHG與第二輸出 . 4 PF分別輸出檢測信號給快速充電控制開關21與控制開關 25 ’從而使其分別進行不同動作。以下將有詳細描述。 具體地，該快速充電控制開關21分別與保護芯片5〇的第 一輸出端CHG及電池連接’具體地，該快速充電控制開關2ι 包括P型场效應官q6及二極管。該p型場效應管根據保 護芯片50的第一輸出端CHG輸出的檢測信號而導通，從而啟 動快速充電控制開_ 21，以對電池進行大電流的快速充電動 作。其中，該保護芯片50與快速充電控制開關2丨的p型場效 瞻應官Q6的柵極連接，以控制p型場效應管Q6的導通及截止。 該慢速充電控制開關23包括P型場效應管Q5及二極管。 充電控制電路20還包括一限流電阻R1，限流電阻R1與該慢 速充電控制開關23連接，若慢速充電控制開關23導通時，限 流電阻R1限制充電電流而提供低電流給充電電池。兩充電控201123680 VI. Description of the Invention: [Technical Field] The present invention relates to a rechargeable battery pack control circuit, and more particularly to an overcharge protection device for a rechargeable battery. [Prior Art] A clock-ion battery which is a high-capacity rechargeable battery is known as an ideal rechargeable battery because it has no memory effect. When a chain ion battery is used in a power product such as an electronic product, a motor, or a vehicle, it is often necessary to use a multi-cell lithium-ion battery in series to achieve the voltage required for the power product. For example, on a notebook computer, a 3 to 4 cell lithium-ion battery is usually connected in series to form a u lv or 14 8v battery system. However, in series, inevitably, due to the difference in voltage and electrical characteristics of the battery cells, there may be differences in the voltage and valley of each battery in each group of cells. This difference will occur after multiple charge and discharge cycles. It becomes more and more obvious, which seriously affects the life and reliability of the series battery system. Especially when charging with the fast charger currently used, the effect is more obvious. = The charging of a large current is very likely to cause some of the battery voltages to be too high, and the battery is not fully charged for a long time. Thus, the overall capacity of the battery is reduced as a whole. Moreover, the battery that causes overcharging will age and the life expectancy will be greatly reduced. Therefore, based on this problem, it is common to increase the balance control circuit in a multi-cell series system to balance the voltage between the individual cells in each battery, and the recovery life and reliability of the battery system. Please refer to the figure--the current commonly used rechargeable battery overcharge protection device 3, the balance of the general (4) secret (10) is the balance mode of mining, that is, parallel on the mother cell - a resistor and a switch The switch is controlled by the balance control circuit 100. The balance control circuit 100 monitors the voltage of each cell, and 201123680 ▲ finds that after one of the cells is abnormal, the switch is controlled to control the charge control circuit. Specifically, if the voltage of one of the cells is too high, the switch connected in parallel with the battery cell is closed, and a part of the charging material over-phase resistor is bypassed, thereby slowing down the (four) core. The charging speed can achieve a certain balance effect. However, the excess energy (the high-voltage battery stores excess energy) is consumed by the balance resistor in the form of thermal energy, which is not effective and easy. The balance resistance is excessively heated, causing the temperature of the battery to be too high, and the safety is not good. SUMMARY OF THE INVENTION The main object of the present invention is to address the above-mentioned shortcomings of the known technology. Providing an over-charge protection device for a rechargeable battery, which can realize a battery from a high current fast charging to a small current slow charging 'to balance the voltage and capacitance between the multi-cell batteries, preventing the battery from overcharging, thereby extending the battery In order to achieve the above object, the present invention provides an overcharge protection device for a rechargeable battery, comprising a detection circuit, a charge control circuit, a balance control circuit and a protection chip, a detection circuit and a protection chip. The input terminals are respectively connected with the battery to detect the battery voltage, and respectively output different detection signals. The input end of the charging control circuit is connected with the output end of the protection chip, and the slow charging action is performed according to the corresponding detection signal. The control circuit is connected to the output end of the detection circuit, and performs a balanced charging operation according to the activation of the corresponding detection signal. As described above, the overcharge protection device of the rechargeable battery of the present invention enables the rechargeable battery to perform rapid charging of a large current, and its voltage After reaching a certain value, the balance control circuit is based on the corresponding The signal is activated and the charging control circuit enters a small current for slow charging', thereby changing the charging mode from high current charging to low current charging. 201123680 makes the battery of the higher voltage in the battery pack continuously consume energy, while other batteries Perform small current charging to continuously increase energy, so that the voltage and capacity between the multi-cell rechargeable batteries are balanced, preventing over-saturation charging of the battery, thereby prolonging the service life of the battery and improving the safety and reliability of the battery. DETAILED DESCRIPTION OF THE INVENTION The technical content, structural features, objects and effects achieved by the present invention will be described in detail below with reference to the embodiments. Referring to the second to fourth figures, the overcharge protection of the rechargeable battery of the present invention is described. The first embodiment of the device 1 includes a detection circuit 10, a charge control circuit 2, a balance control circuit 30, and a protection chip 5 (H, wherein the detection circuit 丨〇 and the protection chip 50 are respectively used to detect voltage conditions between the plurality of cells And outputting different detection signals, the charging control circuit 20 is connected to the protection chip 5〇, and according to the corresponding detection The signal is charged and the slow charging operation is performed. The balance control circuit 3 is connected to the detection circuit (7), and the balanced charging operation is performed in accordance with the activation of the corresponding detection signal. As shown in the figure, the detection circuit 1A includes a differential amplifying circuit Η 'comparison circuit = and a reference voltage source 15. In this embodiment, the reference (4) source 丨 5 uses a help chip, which provides a reference voltage value for the comparison circuit 13 of the detection circuit 1 该. The quasi-relocation value can be artificially adjusted. The differential amplifying circuit u includes a complex differential amplifier, and the comparing circuit 13 includes a plurality of comparators, and the number of the differential amplifier and the comparator is set correspondingly according to the number of sections of the rechargeable battery, and the charging battery and the differential amplifier are The number of comparators is 4. The two input ends of the differential amplifier are connected to two batteries to compare the electrical enthalpy difference between the two batteries, and the output of the differential amplifier is connected to an input of the comparator to The ratio is two to ^. The other input terminal of the comparator is compared with the reference voltage source. β compares the result of the differential amplifier output with the reference electric dust value, and outputs a different detection signal. Specifically, if the junction of the differential amplifier output 201123680 (4) is lower than the reference power failure, the comparison circuit 13 turns off the balance control circuit 30, and if the result of the differential amplifier output is higher than the reference power value, the comparison is performed. 13 starts the balance control circuit 30. The charge control circuit 2G includes a fast charge control switch 2, a slow charge control switch 23, and a control switch 25. The protection chip (10) used in this embodiment is a compact 2 chip. The protection chip 5 is connected to the battery and the charging control circuit to monitor and detect the occurrence of over-current, over-current, and over-current in the circuit. Protect the film 50 to detect the voltage of each battery. If the voltage of one of the batteries is high and the reference voltage value, protect the first output CHG and the second output of the 5 .. 4 PF output the detection signal to the fast charge control. The switch 21 and the control switch 25' are thereby caused to perform different operations. A detailed description will be given below. Specifically, the fast charge control switch 21 is respectively connected to the first output terminal CHG of the protection chip 5A and the battery. Specifically, the fast charge control switch 2i includes a P-type field effector q6 and a diode. The p-type field effect transistor is turned on in accordance with a detection signal output from the first output terminal CHG of the protection chip 50, thereby initiating the fast charge control on_ 21 to perform a fast charging operation of the battery at a large current. The protection chip 50 is connected to the gate of the p-type field effect transistor Q6 of the fast charge control switch 2 to control the turn-on and turn-off of the p-type field effect transistor Q6. The slow charge control switch 23 includes a P-type field effect transistor Q5 and a diode. The charging control circuit 20 further includes a current limiting resistor R1. The current limiting resistor R1 is connected to the slow charging control switch 23. If the slow charging control switch 23 is turned on, the current limiting resistor R1 limits the charging current to provide a low current to the rechargeable battery. . Two charge control
制開關21 ' 23的週邊還具有電容、電阻、保險絲、二極管: 元件。 S 該控制開關25的輸入端與保護芯片50的第二輸出端pF 連接’控制開關25的輸出端與慢速充電控制開關23連接，以 201123680 控制4 it速充電控制開關23的導通。具體的描述請參見下文。 在本實施例中，平衡控制電路3G包括複數平衡控制單 元’相應地，平衡控制單元的個數為4，每兩節充電電池之間 ，有-個平衡控制單元。每—平衡控制單⑽由p型場效應 e、一極官及耗能電阻R2組成。每一平衡控制單元的p型場 效鮮的栅極均與相應的比較電路13的輸出端連接，p型場 效應管之間通過相應的漏極及射極連接。 斤具體地，控制開關25包括p型場效應管Q7&N型場效 應s Q8，P型场效應官q7的射極與基準電壓源υ連接，柵 極與保護芯片50的第二輸出端PF連接，以接收第二輸出端 PF曰的檢測信號，而漏極則與N型場效應管Q8的柵極連接。n 型場效應管Q8的漏極與慢速充電控制開關23的p型場效應 管Q5的柵極連接，從而啟動慢速充電控制開m 23，以使電2 進入低電流的慢速充電動作。 /7囬 保護U 50與充電電料接從而獲取各節充電 電池的電壓’若其中—節電池的電屋高於基準電壓值時，保護 芯片50的第一輸出端CHG輸出檢測信號，使得與立連接的快 速充電控制開關21進人截止狀態，即，快速充電路徑被斷開; 另一方面，控制開_ 25與慢速充電控制開_ Μ連接，p型場 效應管（57及Μ場效應fQ8相繼導通，從而導通慢速充電 控制開關23 ’使得電池進人慢速充電狀態。此時，充電模式 由大電流充電轉為小電流充電。 請參閱第四圖與第五圖，現舉例說明本發明 3〇的啟動時的工作狀況。若檢測電路1〇與保護芯片5〇分別 檢測出第三節電池的電壓高於基準電壓值時檢測電路_ 保護芯片％分別輸出檢測信號，保護芯片5G輸出的檢測信號 201123680 使快速充電路徑被斷開，慢速充電路徑被導通，此時，充電模 式由大電流充電轉為小電流充電，而小充電電流被提供給節電 • 2 ’檢測電路1G輸出的檢測信號使連接於第三節電池與第二 郎電池之間的平衡控制單元導通，而其他平衡控制單元導通斷 開’所以’小充電電流將分別流經各節電池，由於平衡控制單 疋導通’第三節電池亦會輸出電流給平衡控制單元，當第三節 電池輸出電流給平衡控制單元時，該電流將被平衡控制單元= 耗能電阻R2所消耗（如第五圖箭頭所示）。所以第三節電池將 持續消耗能量，而其他節電池以小電流充電持續增加能量使得 多節充電電池之間的電壓及容量趨於平衡，防止了電池過飽和 充電，從而延長電池的使用壽命及提高電池的安全可靠性。 第六圖及第七_本發日月充㈣路的過充電保護裝置2 的第二個實施例的示意圓。本實施例中，該充電電路的過充電 保護裝置2還包括光耗合開關電路7〇。該輕 包括發光二極管71及晶體管73。發光二極管71電編妾至平 純制電路30的輸出端，用以根據平衡控制電路％的信號決 定是否發光。而晶體管73電㈣至控制開關Μ，並根據發光 二=71的發光與否而決定晶體管73的阻抗，而使控制開關 25導通或截止。 «地，該控制開關25為N型場效應管Q9，該n型場 效應管Q9分別與充電控制電路2()及保護芯片⑽相連。且體 地，本實施例中，該保護芯片5〇為s_8254芯片。1中，㈣ 場效應管Q9 _極與練合„電路7〇的輸出端連接，漏 極與快速充電控制關21連接，而射極則分別與保㈣片5〇 及慢速充電控制開關23連接，用以控制充電控制電路2〇由快 速充電狀態轉為慢速充電狀態。 201123680 充電初期’快速充電控制開關21處於導通狀態。當平衡 控制電路30因接收比較電路13相應的檢測信號而被啟動時， 其輸出的彳silfe送至光搞合開關電路70，光柄合開關電路隨 之啟動，並使控制開關25 ’即N型場效應管Q9截止。此時， N型場效應管Q9使得與其漏極相接的快速充電控制開關2工 截止’而與其射極相接的慢速充電控制開關23導通，從而使 電池進入慢充充電狀態。此時，充電模式從大電流充電轉為小 電流充電’使能量較低的電池進行充電工作，能量較高的電池 進行耗電工作，使得各電池的電壓、容量趨於平衡，防止了電 池的過飽和充電’從而延長電池的使用壽命及提高電池的安全 可靠性。 綜上所述，本發明充電電池的過充電保護裝置1、2能使 充電電池在進行大電流的快速充電後，平衡控制電路3〇啟動 並使充電控制電路20的快速充電控制開關21截止，而導通慢 速充電控制開關23 ’從而進入小電流的慢速充電，從而使充 電模式從大電流充電轉為小電流充電，而平衡控制電路3〇的 啟動，使得電池組中較高電壓的電池持續消耗能量，而其他電 池則進行小電流充電以持續增加能量，從而使多節充電電池之 間的電壓及容量趨於平衡，防止了電池過飽和充電，從而延長 電池的使用壽命及提高電池的安全可靠性。 【圖式簡單說明】 第一圖為一種習知充電電池的過充電保護裝置之示意圖。 第二圖為本發明充電電池的過充電保護裝置的一個實施 例之示意圖。 第三圖為如第二圖所示充電電池的過充電保護裝置之詳 細示意圖。 201123680 置之電 第四圖為如第三圖所示充電電池的過充電保護裝 路示意圖。 置的平衡 第五圖為如第四圖所示充電電池的過充保護裝 控制電路之動作示意圖。 置的另一實施 第六圖為本發明充電電池的過充電保護裝 例之示意圖。 電保護裝置之電 第七圖為如第六圖所示充電電池的過充 路示意圖。The periphery of the switch 21' 23 also has a capacitor, a resistor, a fuse, and a diode: a component. S The input of the control switch 25 is connected to the second output terminal pF of the protection chip 50. The output of the control switch 25 is connected to the slow charge control switch 23 to control the conduction of the 4 it speed charge control switch 23 with 201123680. See below for a detailed description. In the present embodiment, the balance control circuit 3G includes a plurality of balance control units. Accordingly, the number of balance control units is four, and there is a balance control unit between each two rechargeable batteries. Each balance control unit (10) consists of a p-type field effect e, a pole officer and a power dissipation resistor R2. The gates of the p-type field effect of each of the balance control units are connected to the output terminals of the corresponding comparison circuits 13, and the p-type field effect transistors are connected by corresponding drains and emitters. Specifically, the control switch 25 includes a p-type field effect transistor Q7 & N-type field effect s Q8, the emitter of the P-type field effector q7 is connected to the reference voltage source ,, and the second output terminal PF of the gate and protection chip 50 Connected to receive the detection signal of the second output terminal PF, and the drain is connected to the gate of the N-type field effect transistor Q8. The drain of the n-type FET Q8 is connected to the gate of the p-type field effect transistor Q5 of the slow charge control switch 23, thereby initiating the slow charge control switch m 23 to cause the power 2 to enter a low current slow charging action. . /7 back protection U 50 is connected with the charging material to obtain the voltage of each section of the rechargeable battery. If the battery of the battery is higher than the reference voltage value, the first output terminal CHG of the protection chip 50 outputs a detection signal, so that The fast charging control switch 21 of the vertical connection enters the cut-off state, that is, the fast charging path is disconnected; on the other hand, the control open _ 25 is connected with the slow charging control _ ,, the p-type FET (57 and the market) The effect fQ8 is turned on successively, thereby turning on the slow charging control switch 23' to cause the battery to enter a slow charging state. At this time, the charging mode is switched from a large current charging to a small current charging. Please refer to the fourth and fifth figures, for example. The operation state at the time of startup of the present invention will be described. If the detection circuit 1〇 and the protection chip 5〇 respectively detect that the voltage of the third battery is higher than the reference voltage value, the detection circuit _ protection chip % outputs a detection signal, respectively, to protect the chip. The detection signal of the 5G output 201123680 causes the fast charging path to be disconnected, and the slow charging path is turned on. At this time, the charging mode is switched from a large current charging to a small current charging, and a small charging power is charged. Is supplied to the power saving • 2' detection circuit 1G output detection signal enables the balance control unit connected between the third battery and the second battery to be turned on, while the other balance control unit is turned on and off 'so' the small charging current will be respectively Flow through each cell, because the balance control unit is turned on, the third cell will also output current to the balance control unit. When the third cell output current is supplied to the balance control unit, the current will be balanced by the control unit = energy dissipation resistor. R2 is consumed (as shown by the arrow in the fifth figure), so the third battery will continue to consume energy, while other battery cells are charged with a small current and continue to increase energy so that the voltage and capacity between the multi-cell rechargeable batteries tend to balance, preventing The battery is supersaturated and charged, thereby prolonging the service life of the battery and improving the safety and reliability of the battery. Figure 6 and the seventh embodiment of the second embodiment of the overcharge protection device 2 of the monthly charging (four) road. In an embodiment, the overcharge protection device 2 of the charging circuit further includes a light consuming switch circuit 7. The light includes a light emitting diode 71 and a transistor 73. The photodiode 71 is electrically edited to the output end of the flat pure circuit 30 for determining whether to emit light according to the signal of the balance control circuit %, and the transistor 73 is electrically (four) to the control switch Μ, and according to whether the illuminating light=71 is illuminated or not. The impedance of the transistor 73 is determined, and the control switch 25 is turned on or off. «The ground control transistor 25 is an N-type field effect transistor Q9, and the n-type field effect transistor Q9 is connected to the charge control circuit 2 () and the protection chip (10), respectively. And in the embodiment, the protection chip 5 is s_8254 chip. In the first, (4) the field effect transistor Q9 _ pole is connected with the output end of the circuit 7 ,, and the drain is connected with the fast charge control off 21 The emitter is connected to the (4) piece 5〇 and the slow charge control switch 23, respectively, for controlling the charging control circuit 2 to switch from the fast charging state to the slow charging state. 201123680 Initial charging period The fast charge control switch 21 is in the on state. When the balance control circuit 30 is activated by receiving the corresponding detection signal of the comparison circuit 13, the output 彳silfe is sent to the light-combining switch circuit 70, and the optical shank switch circuit is activated, and the control switch 25' is N. The type field effect transistor Q9 is turned off. At this time, the N-type field effect transistor Q9 causes the fast charge control switch 2, which is in contact with its drain, to be turned off, and the slow charge control switch 23, which is in contact with its emitter, is turned on, thereby causing the battery to enter a slow charge state. At this time, the charging mode is changed from high-current charging to low-current charging, so that the battery with lower energy is charged, and the battery with higher energy is used for power consumption, so that the voltage and capacity of each battery tend to balance, and the battery is prevented. Over-saturation charging' to extend battery life and improve battery safety and reliability. In summary, the overcharge protection devices 1, 2 of the rechargeable battery of the present invention enable the balance control circuit 3 to be activated and the fast charge control switch 21 of the charge control circuit 20 to be turned off after the charging battery is rapidly charged with a large current. And the slow charging control switch 23' is turned on to enter the slow charging of the small current, so that the charging mode is switched from the high current charging to the small current charging, and the balancing control circuit 3 is activated, so that the battery of the higher voltage in the battery pack Continue to consume energy, while other batteries charge small currents to continuously increase energy, so that the voltage and capacity between multi-cell rechargeable batteries are balanced, preventing over-saturation of the battery, thereby extending battery life and improving battery safety. reliability. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a schematic diagram of an overcharge protection device for a conventional rechargeable battery. The second figure is a schematic diagram of an embodiment of an overcharge protection device for a rechargeable battery of the present invention. The third figure is a detailed diagram of the overcharge protection device of the rechargeable battery as shown in the second figure. 201123680 Powered The fourth picture shows the overcharge protection circuit of the rechargeable battery as shown in the third figure. Balanced Figure 5 is a schematic diagram of the operation of the overcharge protection device control circuit of the rechargeable battery as shown in the fourth figure. Another embodiment of the present invention is a schematic view of an overcharge protection device for a rechargeable battery of the present invention. The electric power protection device The seventh figure is a schematic diagram of the overcharge path of the rechargeable battery as shown in the sixth figure.
【主要元件符號說明】 充電電池的過充電保護裝置 1 ' 2 檢測電路 10 差動放大電路 11 比較電路 13 基準電壓源 15 充電控制電路 20 快速充電控制開關 21 慢速充電控制開關 23 控制開關 25 平衡控制電路 30 保護芯片 50 光耦合開關電路 70 發光二極管 71 晶體管 73 P型場效應管 Q5-Q7 N型場效應管 Q8、Q9 第一輸出端 CHG 第二輸出端 PF 限流電阻 R1 耗能電阻 R2[Description of main component symbols] Overcharge protection device for rechargeable battery 1 ' 2 Detection circuit 10 Differential amplifier circuit 11 Comparison circuit 13 Reference voltage source 15 Charge control circuit 20 Fast charge control switch 21 Slow charge control switch 23 Control switch 25 Balance Control circuit 30 protection chip 50 optical coupling switch circuit 70 light-emitting diode 71 transistor 73 P-type field effect transistor Q5-Q7 N-type field effect transistor Q8, Q9 first output terminal CHG second output terminal PF current limiting resistor R1 energy dissipation resistor R2