CN113659674A - Single-cell lithium-ion battery charge and discharge protector - Google Patents

Single-cell lithium-ion battery charge and discharge protector Download PDF

Info

Publication number
CN113659674A
CN113659674A CN202110933302.4A CN202110933302A CN113659674A CN 113659674 A CN113659674 A CN 113659674A CN 202110933302 A CN202110933302 A CN 202110933302A CN 113659674 A CN113659674 A CN 113659674A
Authority
CN
China
Prior art keywords
discharge
ion battery
voltage
charging
charge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110933302.4A
Other languages
Chinese (zh)
Inventor
冬雷
杨瑾瑜
闵星旖
马滢
杨洁
方淑星
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Power Kingkong Technology Co ltd
Original Assignee
Beijing Power Kingkong Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Power Kingkong Technology Co ltd filed Critical Beijing Power Kingkong Technology Co ltd
Priority to CN202110933302.4A priority Critical patent/CN113659674A/en
Publication of CN113659674A publication Critical patent/CN113659674A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H02J7/62—
    • H02J7/61—
    • H02J7/63—
    • H02J7/865—
    • H02J7/96—

Landscapes

  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

本发明设计了一种单电芯锂离子电池充放电保护器，该装置包括放电控制单元、充电控制单元、锂离子电池、可恢复保险丝、充放电正端、充电负端、放电负端。与现有技术相比，放电控制单元仅有六个分立器件，充电控制单元也仅有六个分立器件，加上可恢复保险丝，整个单电芯锂离子电池充放电保护器仅有十三个常规的分立器件，就实现了过充、过放、过流的三项保护，结构非常简单，而且价格非常低，适合单电芯锂离子电池的保护控制；可以设置充电截止电压和放电截止电压，防止充放电过程中出现过充或过放的现象；充电保护和放电保护独立进行，互不影响，提高了可靠性；电池放电回路不经过充电控制单元，从而提高锂离子电池的放电效率。

Figure 202110933302

The invention designs a single-cell lithium-ion battery charge-discharge protector, which includes a discharge control unit, a charge control unit, a lithium-ion battery, a recoverable fuse, a charge-discharge positive end, a charge negative end, and a discharge negative end. Compared with the prior art, the discharge control unit has only six discrete devices, and the charge control unit also has only six discrete devices. With the addition of a resettable fuse, the entire single-cell lithium-ion battery charge and discharge protector has only thirteen. Conventional discrete devices realize three protections of overcharge, overdischarge and overcurrent. The structure is very simple and the price is very low, which is suitable for the protection control of single-cell lithium-ion batteries; the charge cut-off voltage and discharge cut-off voltage can be set , to prevent the phenomenon of overcharging or overdischarging during the charging and discharging process; the charging protection and the discharging protection are carried out independently and do not affect each other, which improves the reliability; the battery discharge circuit does not pass through the charging control unit, thereby improving the discharge efficiency of the lithium-ion battery.

Figure 202110933302

Description

Single-electric core lithium ion battery charging and discharging protector
Technical Field
The present invention relates to a battery management system of a lithium ion battery, and more particularly, to a charge/discharge protection device of a single-cell lithium ion battery.
Background
The lithium ion battery has the advantages of high energy density, good safety performance and long cycle life, and is widely applied to the new energy automobile industry, the starting power supply, the energy storage market and the military field. However, if the lithium ion battery is overcharged, the electrolyte and other materials can be decomposed to generate gas, so that the battery shell or the pressure valve is expanded and broken, and then explodes; if the voltage of the battery cell is too low, partial materials in the battery cell begin to be damaged, and the voltage is lower as the battery self-discharges; in addition, when the charging current is too large, lithium ions cannot enter the storage cells in time and are gathered on the surface of the material, and after the lithium ions acquire electrons, lithium atom crystallization is generated on the surface of the material, lithium dendrite is generated, and internal short circuit of the battery is generated. Therefore, at least three protection items of overcharge, overdischarge and overcurrent are required to be carried out on the lithium ion battery.
Chinese patent CN112234689B discloses a charge and discharge protection circuit and a lithium ion battery protection system, which adopts two comparators to collect the voltage of a lithium ion battery, and forms a charge and discharge control circuit by a plurality of digital integrated circuits, the structure is relatively complex, only one MOSFET is used as a power switch, only charging can be controlled, if discharging is to be controlled, the invention also needs to design one MOSFET as a discharging power switch.
Patent CN104682355B discloses a lithium ion battery protection circuit, which needs a special multi-way switch and a voltage comparison circuit, and also needs a plurality of digital integrated chips to form a logic circuit, and four field effect transistors are used for realizing charging and discharging control, so that the control logic is very complex.
In addition, the charging and discharging protection of the lithium ion battery at present mostly adopts an integrated voltage acquisition and control circuit, the cost is high, control parameters need to be configured through an upper computer, the use process is complex, and the application in a single-cell lithium ion battery or different types of lithium ion batteries is not facilitated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the single-cell lithium ion battery charging and discharging protector, and compared with the prior art, the single-cell lithium ion battery charging and discharging protector has fewer devices, does not need a special voltage measurement integrated circuit and does not need an additional auxiliary power supply. Overcharge, overdischarge, and overcurrent can be independently protected. The charging cut-off voltage and the discharging cut-off voltage can be conveniently set according to different charging and discharging voltage parameters of different types of lithium ion batteries, and different protection current limits can also be set.
The technical scheme adopted by the invention is as follows:
in order to achieve the purpose, the single-cell lithium ion battery charge-discharge protector comprises a discharge control unit, a charge control unit, a lithium ion battery, a restorable fuse, a charge-discharge positive terminal, a charge negative terminal and a discharge negative terminal; the output end of the discharge control unit is connected with the lithium ion battery in parallel, the input end of the discharge control unit is connected with the charge and discharge positive end through a restorable fuse, the positive input end of the charge control unit is connected with the charge and discharge positive end through the restorable fuse, the negative input end of the charge control unit is directly connected with the charge negative end, the output end of the charge control unit is connected with the negative electrode of the lithium ion battery, and the discharge negative end is connected with the negative electrode of the lithium ion battery; the discharge control unit is used for detecting the voltage at two ends of the lithium ion battery in the discharge process, and when the discharge voltage is lower than the discharge protection voltage, the discharge control unit disconnects the positive electrode of the lithium ion battery from the charge and discharge positive end; the charging control unit is used for detecting the charging voltage in the charging process, and disconnecting the negative electrode of the lithium ion battery from the charging negative terminal when the charging voltage is higher than the charging protection voltage; the restorable fuse is used for disconnecting the anode of the lithium ion battery from an external circuit when the charging and discharging current exceeds a protection value, so as to protect the lithium ion battery; the load is connected between the charge and discharge positive end and the discharge negative end, so that the discharge loop does not pass through the charge control unit, and the loss of the lithium ion battery in the discharge process is reduced; the discharging control unit only controls the anode of the lithium ion battery, and the charging control unit only controls the cathode of the lithium ion battery; the charge-discharge protector of the single-cell lithium battery can set a charge cut-off voltage ECAnd discharge cutoff voltage EDAnd the phenomenon of overcharge or overdischarge in the charging and discharging process is prevented.
The discharge control unit comprises a first MOSFET, a first voltage stabilizer, a first resistor, a first capacitor, a second resistor and a third resistor, wherein the source electrode of the first MOSFET is connected with the anode of the lithium ion battery; the first resistor is connected in parallel at two ends of a gate electrode and a source electrode of the first MOSFET and used as a gate electrode driving resistor; the second resistor and the third resistor are connected in series and then connected in parallel to the positive electrode and the negative electrode of the lithium ion battery for detecting the voltage of the battery, wherein a point A is connected with the feedback electrode of the first voltage stabilizer, and the first capacitor and the second resistor are connected in parallel to filter interference signals; the negative electrode of the first voltage stabilizer is connected with the gate electrode of the first MOSFET, and the positive electrode of the first voltage stabilizer is connected with the negative electrode of the lithium ion battery; the drain of the first MOSFET is connected to the resettable fuse as an input of the discharge control unit.
The charging control unit comprises a fourth resistor, a fifth resistor, a sixth resistor, a second capacitor, a second MOSFET and a second voltage stabilizer, wherein the fourth resistor and the fifth resistor are connected in series and then connected in parallel between the restorable fuse and the charging negative terminal to detect charging voltage, a point B is connected with a feedback electrode of the second voltage stabilizer, and the second capacitor and the fifth resistor are connected in parallel to filter interference signals; the anode of the second voltage stabilizer is connected with the charging negative terminal, and the cathode of the second voltage stabilizer is connected with the gate pole of the second MOSFET; the drain electrode of the second MOSFET is used as the output end of the charging control unit and is connected with the negative electrode of the lithium ion battery, and the source electrode of the second MOSFET is connected with the charging negative end; one end of the sixth resistor is connected with the restorable fuse, and the other end of the sixth resistor is connected with the gate pole of the second MOSFET and used as a gate pole driving resistor.
The first MOSFET is a P-channel MOSFET, and the second MOSFET is an N-channel MOSFET.
And the source electrode of the first MOSFET P channel MOSFET is connected with the anode of the lithium ion battery to control the discharge of the lithium ion battery.
And the drain electrode of the second MOSFET channel MOSFET is connected with the negative electrode of the lithium ion battery to control the charging of the lithium ion battery.
The first voltage stabilizer and the second voltage stabilizer are three-terminal low-voltage adjustable precise parallel voltage stabilizers.
And the charge and discharge negative terminal is used for replacing the charge negative terminal, and the discharge negative terminal is cancelled, so that the charge and discharge positive terminal and the charge and discharge negative terminal are used as a charge interface and a discharge interface.
The discharge cut-off voltageEDThe resistance R of the second resistor and the third resistor2、R3And a first regulator reference voltage V1Determination, i.e. ED＝V1(R2+R3)/R3。
The charge cut-off voltage ECThe resistance value R of the fourth resistor and the fifth resistor4、R5And a second regulator reference voltage V2Determination, i.e. EC＝V2(R4+R5)/R5。
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages and effects:
the single-cell lithium ion battery charging and discharging protector has the advantages that the discharging control unit only has six discrete devices, the charging control unit also only has six discrete devices, the restorable fuse is added, the whole single-cell lithium ion battery charging and discharging protector only has thirteen conventional discrete devices, three protection items of overcharge, overdischarge and overcurrent are realized, the structure is very simple, the price is very low, and the single-cell lithium ion battery charging and discharging protector is suitable for protection control of the single-cell lithium ion battery.
The invention has the advantages that the voltage detection and the protection control of the lithium ion battery are integrated, and no additional independent voltage detection circuit, control circuit and MOSFET drive circuit are needed.
The invention has the advantages that the charging protection and the discharging protection are independently carried out without mutual influence, thereby improving the reliability.
One effect of the present invention is that the charge cut-off voltage and the discharge cut-off voltage can be adjusted by the resistance value, and the present invention is convenient to use.
One effect of the present invention is that the battery discharge circuit does not pass through the charge control unit, thereby improving the discharge efficiency of the lithium ion battery.
Drawings
FIG. 1 is a schematic diagram of a single-cell lithium ion battery charge-discharge protector according to the present invention;
FIG. 2 is a topological schematic diagram of the charge-discharge double negative terminals of the charge-discharge protector of the single-cell lithium ion battery in the invention;
FIG. 3 is a topological schematic diagram of a single negative terminal of the charge-discharge protector of the single-cell lithium ion battery according to the present invention;
FIG. 4 is a schematic diagram of a charging application method of the single-cell lithium ion battery charging/discharging protector according to the present invention;
FIG. 5 shows a second method for applying charging to the charge/discharge protector of a single-cell lithium ion battery according to the present invention;
FIG. 6 is a diagram illustrating one of the discharge application methods of the charge and discharge protector of the single-cell lithium ion battery according to the present invention;
fig. 7 shows a second method for applying discharge of the charge/discharge protector of the single-cell lithium ion battery according to the present invention.
In the drawings, each reference numeral represents a component:
1. the charging control device comprises a discharging control unit, 2, a charging control unit, 3, a lithium ion battery, 4, a recoverable fuse, 5, a charging and discharging positive terminal, 6, a charging negative terminal, 7, a discharging negative terminal, 8, a charging and discharging negative terminal, 101, a first MOSFET, 102, a first voltage stabilizer, 103, a first resistor, 104, a first capacitor, 105, a second resistor, 106, a third resistor, 201, a fourth resistor, 202, a fifth resistor, 203, a sixth resistor, 204, a second capacitor, 205, a second voltage stabilizer, 206 and a second MOSFET.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
Fig. 1 is a schematic structural diagram of a single-cell lithium ion battery charge-discharge protector according to the present invention, which mainly includes a discharge control unit 1, a charge control unit 2, a lithium ion battery 3, and a recoverable fuse 4. The output end of the discharge control unit 1 is connected in parallel with the lithium ion battery 3, the input end of the discharge control unit 1 is connected with the charge and discharge positive end 5 through the restorable fuse 4, the positive input end of the charge control unit 2 is connected with the charge and discharge positive end 5 through the restorable fuse 4, the negative input end of the charge control unit 2 is directly connected with the charge negative end 6, the output end of the charge control unit 2 is connected with the negative electrode of the lithium ion battery 3, and the discharge negative end 7 is connected with the negative electrode of the lithium ion battery 3.
The discharge control unit 1 is used for detecting the voltage at two ends of the lithium ion battery 3 in the discharge process, and when the discharge voltage is lower than the discharge protection voltage, the discharge control unit 1 disconnects the anode of the lithium ion battery 3 from the charge and discharge positive end 5.
The charging control unit 2 is used for detecting the charging voltage in the charging process, and when the charging voltage is higher than the charging protection voltage, the charging control unit 2 disconnects the negative electrode of the lithium ion battery 3 from the charging negative terminal 6.
The restorable fuse 4 is used for disconnecting the anode of the lithium ion battery 3 from an external circuit when the charging and discharging current exceeds a protection value, and protecting the lithium ion battery 3.
The load is connected between the charging and discharging positive terminal 5 and the discharging negative terminal 7, so that the discharging loop does not pass through the charging control unit 2, and the loss of the lithium ion battery 3 in the discharging process is reduced, as shown in fig. 6.
The discharge control unit 1 controls only the positive electrode of the lithium ion battery 3, and the charge control unit 2 controls only the negative electrode of the lithium ion battery 3.
The charge-discharge protector of the single-cell lithium battery can set a charge cut-off voltage ECAnd discharge cutoff voltage EDAnd the phenomenon of overcharge or overdischarge in the charging and discharging process is prevented.
In summary, the charging protection and the discharging protection are independently performed without mutual influence, and the reliability is improved. Moreover, the charging cut-off voltage and the discharging cut-off voltage can be adjusted through the resistance value, and the use is convenient.
During charging, the positive output end of the charger is connected with the positive charging and discharging end 5, and the negative output end of the charger is connected with the negative charging end 6, as shown in fig. 4.
As shown in fig. 2, if the voltage of the lithium ion battery 3 is lower than the charge cut-off voltage EC, the voltage is divided by the fourth resistor 201 and the fifth resistor 202, and the voltage V at the point B is obtainedBIs less than the reference voltage V of the second voltage regulator 2052And thus the second voltage regulator 205 is in an off state, whereinThe two capacitors 204 are connected in parallel to two ends of the fifth resistor 202 for filtering interference signals, so as to prevent the second voltage regulator 205 from generating malfunction. The charging voltage is applied to the gate of the second MOSFET206 through the sixth resistor 203 as a gate drive resistor, and since the second MOSFET206 is an N-channel MOSFET, the second MOSFET206 is turned on when a positive voltage is applied between the gate and the source. The charger current forms a loop through the recoverable fuse 4, the body diode in the first MOSFET101, the lithium ion battery 3, and the second MOSFET206 to charge the lithium ion battery 3.
As the charging current is continuously charged into the lithium ion battery 3, the voltage of the lithium ion battery 3 is continuously increased, and thus the voltage V at the point B is continuously increasedBAnd also gradually increases. When voltage V at point BBGreater than the reference voltage V of the second voltage regulator 2052When the second voltage stabilizer 205 is turned on to short-circuit the gate and the source of the second MOSFET206, the second MOSFET206 is turned off, and the charging loop of the lithium ion battery 3 is cut off, so as to protect the voltage of the lithium ion battery 3 from exceeding the set charging cut-off voltage EC。
As shown in fig. 6, during discharging, the positive output end of the load is connected to the positive charging and discharging end 5, and the negative output end of the load is connected to the negative discharging end 7. If the voltage of the lithium ion battery 3 is higher than the discharge cut-off voltage E at the momentDThen, the voltage is divided by the second resistor 105 and the third resistor 106 to obtain a voltage V at point AAGreater than the reference voltage V of the first voltage regulator 1021Therefore, the first voltage regulator 102 is in a conducting state, wherein the first capacitor 104 is connected in parallel to the two ends of the third resistor 106 for filtering the interference signal, thereby preventing the first voltage regulator 102 from generating a malfunction. The gate voltage of the first MOSFET101 is pulled to the cathode voltage of the lithium ion battery 3 by the first regulator 102, and since the first MOSFET101 is a P-channel MOSFET, the first MOSFET101 is turned on when a positive voltage is applied between the source and the gate via the first resistor 103. The discharge current flows from the positive electrode of the lithium ion battery 3, passes through the first MOSFET101, the recoverable fuse 4, and the load, and flows into the negative electrode of the lithium ion battery 3 to form a discharge loop for supplying power to the load, as shown in fig. 2. Since the discharge current does not pass through the charge control unit 2, the discharge efficiency of the lithium ion battery 3 is high.
With discharge current continuously from lithiumThe voltage of the lithium ion battery 3 is continuously reduced when the ion battery 3 flows out, and the voltage V at the point AAAnd also gradually decreases. When voltage V is at point AAIs less than the reference voltage V of the first voltage regulator 1021When the first voltage stabilizer 102 is turned off, the first resistor 103 pulls the gate voltage of the first MOSFET101 to be the same as the source voltage, the first MOSFET101 is turned off, the discharging loop of the lithium ion battery 3 is cut off, and the voltage of the lithium ion battery 3 is protected from being lower than the set discharging cut-off voltage ED。
When the current flowing through the lithium ion battery 3 is larger than a set value, the resettable fuse 4 is disconnected to prevent overcurrent both during charging and discharging. When the current is lower than a certain value, the resettable fuse 4 can be turned on again.
In the embodiment, the discharge control unit only has six discrete devices, the charge control unit also only has six discrete devices, and the restorable fuse is added, so that the whole single-core lithium ion battery charge-discharge protector only has thirteen conventional discrete devices, realizes three protection of overcharge, overdischarge and overcurrent, has a very simple structure and a very low price, and is suitable for protection control of the single-core lithium ion battery. Meanwhile, the voltage detection and the protection control of the lithium ion battery are integrated, and an additional independent voltage detection circuit, a control circuit and an MOSFET drive circuit are not needed.
In one embodiment, the charge negative terminal 6 is replaced by the charge and discharge negative terminal 8, and the discharge negative terminal 7 is eliminated, so that the charge and discharge positive terminal 5 and the charge and discharge negative terminal 8 serve as both charge and discharge interfaces, as shown in fig. 3. The only difference from the topology of fig. 2 is that the discharging loop passes through the charging control unit 2.
One of the embodiments of the invention: and the lithium titanate battery is subjected to charge and discharge protection by adopting a low-voltage adjustable precise shunt regulator.
Cut-off voltage E for charging lithium titanate batteryCPreferably 2.7V, discharge cut-off voltage EDPreferably 1.5V, i.e. a settable charge cut-off voltage, preferably ECThe discharge cut-off voltage is preferably E when 2.7VDThe maximum charge-discharge current is preferably I (1.5V)M＝2A。Assume that the second resistor 105 has a resistance value of R2The third resistor 106 has a resistance value of R3The fourth resistor 201 has a resistance value of R4The resistance value of the fifth resistor 202 is R5 First voltage regulator 102 and second voltage regulator 205, if preferably using TLV431, feedback pole reference voltage V1＝V2＝1.24V。
Preferably let R4＝12kΩ，R510k omega, make
Figure BDA0003211879370000101
When the battery voltage exceeds ECAt this time, the second MOSFET206 in the charge control unit 2 turns off the charge circuit, protecting the lithium ion battery 3 from being overcharged.
Preferably let R2＝2kΩ，R310k omega, make
Figure BDA0003211879370000102
When the battery voltage is lower than EDAt this time, the first MOSFET101 in the discharge control unit 1 turns off the discharge circuit, thereby protecting the lithium ion battery 3 from over-discharge.
The protection current of the resettable fuse 4 is preferably made to be IM2A, whether in the charged or discharged state, as long as the current exceeds IMThe resettable fuse 4 opens the circuit and protects the circuit from overcurrent, 2A. Only when the circuit current is less than IMWhen the voltage is 2A, the resettable fuse 4 is turned on again.
The second embodiment of the present invention: and the low-voltage adjustable precise parallel voltage stabilizer is adopted to carry out charge and discharge protection on the polymer lithium battery.
Charge cut-off voltage E for polymer lithium battery chargingCPreferably 4.34V, discharge cutoff voltage EDPreferably 2.75V, i.e., the settable charge cut-off voltage is preferably ECThe discharge cut-off voltage is preferably E4.34VDThe maximum charge-discharge current is preferably I (2.75V)M2A. Assume that the second resistor 105 has a resistance value of R2The third resistor 106 has a resistance value of R3The fourth resistor 201 has a resistance value of R4The resistance of the fifth resistor 202 isR5 First voltage regulator 102 and second voltage regulator 205, if preferably using TLV431, feedback pole reference voltage V1＝V2＝1.24V。
Preferably let R4＝25kΩ，R510k omega, make
Figure BDA0003211879370000111
When the battery voltage exceeds ECAt this time, the second MOSFET206 in the charge control unit 2 turns off the charge circuit, protecting the lithium ion battery 3 from being overcharged.
Preferably let R2＝12.2kΩ，R310k omega, make
Figure BDA0003211879370000112
When the battery voltage is lower than EDAt this time, the first MOSFET101 in the discharge control unit 1 turns off the discharge circuit, thereby protecting the lithium ion battery 3 from over-discharge.
The protection current of the resettable fuse 4 is preferably made to be IM3A, whether in the charged or discharged state, as long as the current exceeds IMThe resettable fuse 4 opens the circuit to protect the circuit from overcurrent, 3A. Only when the circuit current is less than IMWhen the fuse 4 is turned on, the fuse is turned on again.
In one embodiment, as shown in fig. 5, a charging application using a single negative terminal topology is used, where the positive output terminal of the charger is connected to the positive charging and discharging terminal 5 and the negative output terminal of the charger is connected to the negative charging terminal 6. When discharging, the positive output of the load is connected to the positive charging and discharging terminal 5 and the negative output of the load is connected to the negative charging terminal 6, see fig. 7.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention, and the invention is therefore not to be limited to the embodiments illustrated herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1.单电芯锂离子电池充放电保护器，其特征在于，包括放电控制单元(1)、充电控制单元(2)、锂离子电池(3)、可恢复保险丝(4)、充放电正端(5)、充电负端(6)、放电负端(7)；1. A single-cell lithium-ion battery charge-discharge protector, characterized in that it includes a discharge control unit (1), a charge control unit (2), a lithium-ion battery (3), a recoverable fuse (4), a charge-discharge positive terminal (5), charging negative terminal (6), discharging negative terminal (7); 放电控制单元(1)的输出端与锂离子电池(3)并联，放电控制单元(1)的输入端经过可恢复保险丝(4)与充放电正端(5)相连，所述充电控制单元(2)的正输入端通过可恢复保险丝(4)与充放电正端(5)相连，充电控制单元(2)的负输入端直接与充电负端(6)相连，充电控制单元(2)的输出端与锂离子电池(3)的负极相连，所述放电负端(7)与锂离子电池(3)的负极相连；The output end of the discharge control unit (1) is connected in parallel with the lithium-ion battery (3), and the input end of the discharge control unit (1) is connected to the positive end (5) of the charge and discharge through a recoverable fuse (4), and the charge control unit ( The positive input terminal of 2) is connected to the charging and discharging positive terminal (5) through the recoverable fuse (4), and the negative input terminal of the charging control unit (2) is directly connected to the charging negative terminal (6). The output end is connected to the negative electrode of the lithium ion battery (3), and the discharge negative end (7) is connected to the negative electrode of the lithium ion battery (3); 放电控制单元(1)用于检测放电过程中锂离子电池(3)两端电压，当放电电压低于放电保护电压时，放电控制单元(1)将锂离子电池(3)正极与充放电正端(5)断开；The discharge control unit (1) is used to detect the voltage across the lithium ion battery (3) during the discharge process, and when the discharge voltage is lower than the discharge protection voltage, the discharge control unit (1) connects the positive electrode of the lithium ion battery (3) to the positive electrode of the charge and discharge. Terminal (5) is disconnected; 充电控制单元(2)用于检测充电过程中的充电电压，当充电电压高于充电保护电压时，充电控制单元(2)将锂离子电池(3)负极与充电负端(6)断开；The charging control unit (2) is used to detect the charging voltage during the charging process, and when the charging voltage is higher than the charging protection voltage, the charging control unit (2) disconnects the negative electrode of the lithium ion battery (3) from the negative charging terminal (6); 可恢复保险丝(4)用于在充放电电流超过保护值时，将锂离子电池(3)正极与外电路断开，对锂离子电池(3)进行保护；The recoverable fuse (4) is used to disconnect the positive electrode of the lithium ion battery (3) from the external circuit when the charging and discharging current exceeds the protection value, so as to protect the lithium ion battery (3); 负载连接在充放电正端(5)与放电负端(7)之间，使得放电回路不经过充电控制单元(2)，减少锂离子电池(3)放电过程中的损耗；The load is connected between the charging and discharging positive terminal (5) and the discharging negative terminal (7), so that the discharging circuit does not pass through the charging control unit (2), and the loss during the discharging process of the lithium ion battery (3) is reduced; 放电控制单元(1)仅控制锂离子电池(3)的正极，充电控制单元(2)仅控制锂离子电池(3)的负极；The discharge control unit (1) only controls the positive electrode of the lithium ion battery (3), and the charging control unit (2) only controls the negative electrode of the lithium ion battery (3); 所述单电芯锂电池充放电保护器可以设置充电截止电压EC和放电截止电压ED，防止充放电过程中出现过充或过放的现象。The single-cell lithium battery charge-discharge protector can be set with a charge cut-off voltage E C and a discharge cut-off voltage ED , so as to prevent overcharge or overdischarge during the charge and discharge process. 2.如权利要求1所述的单电芯锂离子电池充放电保护器，其特征在于，所述放电控制单元(1)包括第一MOSFET(101)、第一稳压器(102)、第一电阻(103)、第一电容(104)、第二电阻(105)、第三电阻(106)，所述第一MOSFET(101)的源极与锂离子电池(3)的正极连接；第一电阻(103)并联在第一MOSFET(101)的门极和源极两端，作为门极驱动电阻；第二电阻(105)与第三电阻(106)串联后并联在锂离子电池(3)的正负极上，用于对电池电压进行检测，其中点A与第一稳压器(102)的反馈极相连，第一电容(104)与第二电阻(105)并联滤除干扰信号；第一稳压器(102)的负极接第一MOSFET(101)的门极，正极接锂离子电池(3)的负极；第一MOSFET(101)的漏极作为放电控制单元(1)的输入端与可恢复保险丝(4)相连。2. The single-cell lithium-ion battery charge-discharge protector according to claim 1, wherein the discharge control unit (1) comprises a first MOSFET (101), a first voltage regulator (102), a first A resistor (103), a first capacitor (104), a second resistor (105), and a third resistor (106), the source of the first MOSFET (101) is connected to the positive electrode of the lithium-ion battery (3); A resistor (103) is connected in parallel across the gate and source of the first MOSFET (101) as a gate drive resistor; a second resistor (105) is connected in series with the third resistor (106) and then connected in parallel to the lithium-ion battery (3 ) on the positive and negative poles of ), used to detect the battery voltage, where point A is connected to the feedback pole of the first voltage regulator (102), and the first capacitor (104) is connected in parallel with the second resistor (105) to filter out interference signals ; The negative electrode of the first voltage stabilizer (102) is connected to the gate of the first MOSFET (101), and the positive electrode is connected to the negative electrode of the lithium-ion battery (3); the drain of the first MOSFET (101) is used as the discharge control unit (1) The input is connected to a resettable fuse (4). 3.如权利要求1所述的单电芯锂离子电池充放电保护器，其特征在于，所述充电控制单元(2)包括第四电阻(201)、第五电阻(202)、第六电阻(203)、第二电容(204)、第二MOSFET(206)和第二稳压器(205)，第四电阻(201)与第五电阻(202)串联之后，并联在可恢复保险丝(4)与充电负端(6)之间，检测充电电压，其中点B与第二稳压器(205)的反馈极相连，第二电容(204)与第五电阻(202)并联滤除干扰信号；第二稳压器(205)的正极接充电负端(6)，其负极接第二MOSFET(206)的门极；第二MOSFET(206)的漏极作为充电控制单元(2)输出端与锂离子电池(3)的负极相连，源极与充电负端(6)相连；第六电阻(203)一端连接可恢复保险丝(4)，一端连接第二MOSFET(206)的门极，作为门极驱动电阻。3. The single-cell lithium-ion battery charge-discharge protector according to claim 1, wherein the charge control unit (2) comprises a fourth resistor (201), a fifth resistor (202), and a sixth resistor (203), a second capacitor (204), a second MOSFET (206) and a second voltage stabilizer (205), the fourth resistor (201) and the fifth resistor (202) are connected in series, and then connected in parallel to the resettable fuse (4). ) and the charging negative terminal (6), the charging voltage is detected, the midpoint B is connected to the feedback pole of the second voltage regulator (205), and the second capacitor (204) is connected in parallel with the fifth resistor (202) to filter out interference signals The anode of the second voltage stabilizer (205) is connected to the negative terminal (6) of the charge, and the cathode of the second voltage regulator (205) is connected to the gate of the second MOSFET (206); the drain of the second MOSFET (206) is used as the output terminal of the charging control unit (2) It is connected with the negative electrode of the lithium ion battery (3), and the source electrode is connected with the charging negative terminal (6). gate drive resistor. 4.如权利要求1所述的单电芯锂离子电池充放电保护器，其特征在于，所述第一MOSFET(101)为P沟道MOSFET，第二MOSFET(206)为N沟道MOSFET。4. The single-cell lithium-ion battery charge-discharge protector according to claim 1, wherein the first MOSFET (101) is a P-channel MOSFET, and the second MOSFET (206) is an N-channel MOSFET. 5.如权利要求1所述的单电芯锂离子电池充放电保护器，其特征在于，所述第一MOSFET(101)P沟道MOSFET的源极接锂离子电池(3)的正极，控制锂离子电池(3)的放电。5. The single-cell lithium-ion battery charge-discharge protector according to claim 1, wherein the source of the P-channel MOSFET of the first MOSFET (101) is connected to the positive electrode of the lithium-ion battery (3), and controls Discharge of Li-ion battery (3). 6.第二MOSFET(206)N沟道MOSFET的漏极接锂离子电池(3)的负极，控制锂离子电池(3)的充电。6. The drain of the N-channel MOSFET of the second MOSFET (206) is connected to the negative electrode of the lithium ion battery (3) to control the charging of the lithium ion battery (3). 7.如权利要求1所述的单电芯锂离子电池充放电保护器，其特征在于，所述第一稳压器(102)和所述第二稳压器(205)为三端低电压可调节精密并联稳压器。7. The single-cell lithium-ion battery charge-discharge protector according to claim 1, wherein the first voltage stabilizer (102) and the second voltage stabilizer (205) are three-terminal low voltage Adjustable precision shunt regulator. 8.如权利要求1所述的单电芯锂离子电池充放电保护器，其特征在于，用充放电负端(8)代替充电负端(6)，并取消放电负端(7)，使充放电正端(5)与充放电负端(8)既作为充电接口，也作为放电接口。8. The single-cell lithium-ion battery charge-discharge protector according to claim 1, wherein the charge-discharge negative end (8) is used instead of the charge-discharge negative end (6), and the discharge-negative end (7) is canceled, so that the The charging and discharging positive terminal (5) and the charging and discharging negative terminal (8) serve as both a charging interface and a discharging interface. 9.如权利要求1和2所述的放电控制单元(1)，其特征在于，所述放电截止电压ED由第二电阻(105)与第三电阻(106)的阻值R2、R3，以及第一稳压器(102)参考电压V1决定，即ED＝V1(R2+R3)/R3。9. The discharge control unit (1) according to claims 1 and 2, wherein the discharge cut-off voltage ED is determined by the resistance values R2, R of the second resistor (105) and the third resistor (106) 3 , and the reference voltage V 1 of the first voltage regulator (102) is determined, that is, ED =V 1 (R 2 +R 3 )/R 3 . 10.如权利要求1和3所述的充电控制单元(2)，其特征在于，所述充电截止电压EC由第四电阻(201)和第五电阻(202)的阻值R4、R5，以及第二稳压器(205)参考电压V2决定，即EC＝V2(R4+R5)/R5。10. The charging control unit (2) according to claims 1 and 3, wherein the charging cut-off voltage E C is determined by the resistance values R 4 , R of the fourth resistor ( 201 ) and the fifth resistor ( 202 ) 5 , and the second voltage regulator (205) reference voltage V 2 is determined, ie E C =V 2 (R 4 +R 5 )/R 5 .
CN202110933302.4A 2021-08-14 2021-08-14 Single-cell lithium-ion battery charge and discharge protector Pending CN113659674A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110933302.4A CN113659674A (en) 2021-08-14 2021-08-14 Single-cell lithium-ion battery charge and discharge protector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110933302.4A CN113659674A (en) 2021-08-14 2021-08-14 Single-cell lithium-ion battery charge and discharge protector

Publications (1)

Publication Number Publication Date
CN113659674A true CN113659674A (en) 2021-11-16

Family

ID=78491627

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110933302.4A Pending CN113659674A (en) 2021-08-14 2021-08-14 Single-cell lithium-ion battery charge and discharge protector

Country Status (1)

Country Link
CN (1) CN113659674A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010011574A (en) * 2008-06-25 2010-01-14 Panasonic Corp Charging/discharging control circuit
CN203326662U (en) * 2013-06-28 2013-12-04 国家电网公司 Storage battery discharge undervoltage identification circuit
CN203445640U (en) * 2013-07-19 2014-02-19 无锡科技职业学院 Independent photovoltaic system
CN105762769A (en) * 2016-04-26 2016-07-13 深圳珈伟光伏照明股份有限公司 Cell protection circuit applied to solar photovoltaic product
CN206323122U (en) * 2016-12-15 2017-07-11 广州视源电子科技股份有限公司 PFC overvoltage protection circuit
CN107591855A (en) * 2017-09-18 2018-01-16 欣旺达电子股份有限公司 Charging and discharging lithium battery loop and lithium battery
CN109088461A (en) * 2018-10-10 2018-12-25 北京动力京工科技有限公司 A kind of electrically independent multichannel variety classes battery pack parallel control device of charge and discharge and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010011574A (en) * 2008-06-25 2010-01-14 Panasonic Corp Charging/discharging control circuit
CN203326662U (en) * 2013-06-28 2013-12-04 国家电网公司 Storage battery discharge undervoltage identification circuit
CN203445640U (en) * 2013-07-19 2014-02-19 无锡科技职业学院 Independent photovoltaic system
CN105762769A (en) * 2016-04-26 2016-07-13 深圳珈伟光伏照明股份有限公司 Cell protection circuit applied to solar photovoltaic product
CN206323122U (en) * 2016-12-15 2017-07-11 广州视源电子科技股份有限公司 PFC overvoltage protection circuit
CN107591855A (en) * 2017-09-18 2018-01-16 欣旺达电子股份有限公司 Charging and discharging lithium battery loop and lithium battery
CN109088461A (en) * 2018-10-10 2018-12-25 北京动力京工科技有限公司 A kind of electrically independent multichannel variety classes battery pack parallel control device of charge and discharge and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陈有卿: "电子元器件选择使用快速入门", 山东科学技术出版社, pages: 196 - 313 *

Similar Documents

Publication Publication Date Title
CN104600676B (en) Battery protecting circuit, electric energy provide device and electronic installation
CN102545291B (en) Solar power storage system and solar power supply system
CN103038974B (en) Senior rechargeable battery system
CN111211587A (en) A kind of equalization circuit, charging device and energy storage device
CN101777782A (en) Battery pack and method of controlling the same
CN102570403B (en) Temperature protection circuit for lithium ion battery charging and discharging
WO2020056851A1 (en) Charge-discharge drive and protection system for lithium battery
CN107834519A (en) Lithium battery protection control ASIC chip system
WO2008137764A1 (en) Fine-controlled battery-charging system
CN202121027U (en) Battery with high-accuracy current protection circuit
CN110729795A (en) An energy storage power station and its battery equalization control method
CN210839031U (en) Lithium battery protection circuit and protection board
JP3419115B2 (en) Battery charge / discharge protection device
WO2017219359A1 (en) Multi-lug battery
CN207098704U (en) The circuit and battery protection system balanced for adjusting two section voltage of serially-connected cells
CN102231516A (en) Battery protection board, power battery and power battery pack
KR100624942B1 (en) Battery pack
CN116981592A (en) Method and system for battery balancing of electrical series strings of lithium-ion batteries
CN201307774Y (en) Charging-discharging separated protection device
CN210839032U (en) GPS locator lithium battery charging and discharging protection circuit
TWI693772B (en) Battery module having charging management function for each secondary battery cell connected in series
CN209948749U (en) Charge-discharge control protection circuit
CN113659674A (en) Single-cell lithium-ion battery charge and discharge protector
CN2922235Y (en) Power lithium ion cell protecting circuit
WO2016035280A1 (en) Battery system, electric vehicle, and method for charging battery system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20211116