Charging system for multiple strings of lithium batteries

Abstract

The utility model relates to the technical field of lithium battery charging, and discloses a charging system for multiple strings of lithium batteries, which is simple in circuit structure, can use a universal TYPE-C charger on the market to charge within five strings of lithium batteries, and supports charging of 2-5 strings of lithium iron phosphate batteries and ternary system batteries, so that the lithium batteries are convenient to charge, and the service life of the lithium batteries is prolonged. The applicability is high; meanwhile, a full-charge automatic stop function and a tank falling prevention function are achieved, and safe and reliable charging of the battery is achieved; the circuit is simple in structure, a universal TYPE-C charger in the market can be used for charging less than five strings of lithium batteries, and charging of 2-5 strings of lithium iron phosphate batteries and ternary system batteries is supported, so that the lithium batteries are convenient to charge and high in applicability; meanwhile, a full-charge automatic stop function and a tank falling prevention function are achieved, and safe and reliable charging of the battery is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery charging technical field, concretely relates to a kind of charging system of multiple string lithium battery. BACKGROUND

[0002] Lithium battery has the advantages of long cycle life, good low-temperature discharge performance, strong charge retention ability, strong endurance, high specific energy, wide operating temperature range, short charging time and high green environmental protection performance. As a secondary rechargeable battery, lithium battery generally needs to be matched with a special charging adapter. Different lithium batteries require different chargers, and the adaptability is poor. When using multiple lithium battery devices, a special charger is needed, which is inconvenient to carry. This makes it inconvenient to charge lithium batteries. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a charging system for multiple string lithium batteries.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] A charging system for multiple string lithium batteries includes a TYPE-C interface, a protocol module, a switch module, a boost-buck module, and a protection module connected in sequence. The protection module is electrically connected to the multiple string lithium batteries. The TYPE-C interface includes an access device USB1. The switch module includes a switch tube Q13 and a switch tube Q16. The protection module includes a switch tube Q14.

[0006] The 2nd and 5th pins of the access device USB1 are connected in series. The one end of the series connection is connected to the drain of the switch tube Q13. The source of the switch tube Q13 is connected to the ground through a capacitor C31. The other end of the series connection of the 2nd and 5th pins is connected to the base of a switch tube Q16 through a voltage stabilizing tube D14 and a resistor R72. The emitter of the switch tube Q16 is connected to the ground. The collector of the switch tube Q16 is connected to the gate of the switch tube Q14 through a resistor R69. The source and drain of the switch tube Q14 are connected between the boost-buck module and the multiple string lithium batteries.

[0007] In the utility model, preferably, the protocol module includes a protocol controller U4. The 11th to 13th pins of the protocol controller U4 are connected in sequence to the 5th, 4th, and 3rd pins of the access device USB1. The 3rd pin of the access device USB1 and the connection line between the 13th pin of the protocol controller U4 are connected in series with an electronic R66 and an electronic R67, and then connected to the ground. The 4th pin of the access device USB1 and the connection line between the 12th pin of the protocol controller U4 are connected in series with an electronic R66 and an electronic R67, and then connected to the ground. The 2nd pin of the protocol controller U4 is connected to the connection circuit of the access device USB1 and the switch tube Q13. The 1st pin of the protocol controller U4 is connected to the gate of the switch tube Q13.

[0008] In the utility model, preferably, the voltage regulating circuit includes first branch, the first branch includes NMOS tube Q8 and NMOS tube Q11, the drain electrode of NMOS tube Q8 is connected with resistance R20, the source electrode of NMOS tube Q8 is connected with the drain electrode of NMOS tube Q11, the gate electrode of NMOS tube Q8 is connected with resistance R31 and resistance R32 after being connected with the 28th pin of controller U2, the source electrode of NMOS tube Q11 is connected with the 25th pin of controller U2, the gate electrode of NMOS tube Q11 is connected with resistance R31 and resistance R32 after being connected with the 26th pin of controller U2, and the both ends of resistance R32 are connected with diode D11 in parallel, and the source electrode of NMOS tube Q11 is also connected with the 27th pin of controller U2.

[0009] In the utility model, preferably, the voltage regulating circuit includes first branch, the first branch includes NMOS tube Q8 and NMOS tube Q11, the drain electrode of NMOS tube Q8 is connected with resistance R20, the source electrode of NMOS tube Q8 is connected with the drain electrode of NMOS tube Q11, the gate electrode of NMOS tube Q8 is connected with resistance R31 and resistance R32 after being connected with the 28th pin of controller U2, the source electrode of NMOS tube Q11 is connected with the 25th pin of controller U2, the gate electrode of NMOS tube Q11 is connected with resistance R31 and resistance R32 after being connected with the 26th pin of controller U2, and the both ends of resistance R32 are connected with diode D11 in parallel, and the source electrode of NMOS tube Q11 is also connected with the 27th pin of controller U2.

[0010] In the utility model, preferably, the voltage regulating circuit includes first branch, the first branch includes NMOS tube Q8 and NMOS tube Q11, the drain electrode of NMOS tube Q8 is connected with resistance R20, the source electrode of NMOS tube Q8 is connected with the drain electrode of NMOS tube Q11, the gate electrode of NMOS tube Q8 is connected with resistance R31 and resistance R32 after being connected with the 28th pin of controller U2, the source electrode of NMOS tube Q11 is connected with the 25th pin of controller U2, the gate electrode of NMOS tube Q11 is connected with resistance R31 and resistance R32 after being connected with the 26th pin of controller U2, and the both ends of resistance R32 are connected with diode D11 in parallel, and the source electrode of NMOS tube Q11 is also connected with the 27th pin of controller U2.

[0011] In the utility model, preferably, the voltage regulating circuit includes first branch, the first branch includes NMOS tube Q8 and NMOS tube Q11, the drain electrode of NMOS tube Q8 is connected with resistance R20, the source electrode of NMOS tube Q8 is connected with the drain electrode of NMOS tube Q11, the gate electrode of NMOS tube Q8 is connected with resistance R31 and resistance R32 after being connected with the 28th pin of controller U2, the source electrode of NMOS tube Q11 is connected with the 25th pin of controller U2, the gate electrode of NMOS tube Q11 is connected with resistance R31 and resistance R32 after being connected with the 26th pin of controller U2, and the both ends of resistance R32 are connected with diode D11 in parallel, and the source electrode of NMOS tube Q11 is also connected with the 27th pin of controller U2.

[0012] In the utility model, preferably, the voltage regulating circuit includes first branch, the first branch includes NMOS tube Q8 and NMOS tube Q11, the drain electrode of NMOS tube Q8 is connected with resistance R20, the source electrode of NMOS tube Q8 is connected with the drain electrode of NMOS tube Q11, the gate electrode of NMOS tube Q8 is connected with resistance R31 and resistance R32 after being connected with the 28th pin of controller U2, the source electrode of NMOS tube Q11 is connected with the 25th pin of controller U2, the gate electrode of NMOS tube Q11 is connected with resistance R31 and resistance R32 after being connected with the 26th pin of controller U2, and the both ends of resistance R32 are connected with diode D11 in parallel, and the source electrode of NMOS tube Q11 is also connected with the 27th pin of controller U2.

[0013] In the utility model, preferably, inductance L1 is connected between the first branch and the second branch.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The system circuit of the utility model has simple structure, can use the charger of general TYPE-C on the market to charge the lithium battery within 5 strings, supports the charging of 2-5 string lithium iron phosphate battery and ternary system battery, makes the lithium battery charging convenient and strong in applicability, has full self-stopping function and anti-inverted tank function, and realizes safe and reliable charging of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 A structure block diagram of the charging system of the multiple-string lithium battery.

[0017] Fig. 2 A circuit diagram of the TYPE-C interface, protocol module and switch module of the charging system of the multiple-string lithium battery.

[0018] Fig. 3 A circuit diagram of the voltage-lifting and voltage-lowering module and protection module of the charging system of the multiple-string lithium battery. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or intervening components can also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components can also be present. When a component is referred to as being "disposed" on another component, it can be directly on the other component or intervening components can also be present. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0022] Please also refer toFigs. 1 to 3 The utility model provides a kind of charging system of multiple string lithium batteries, including TYPE-C interface, protocol module, switch module, boost-buck module and protection module connected in turn, when external adapter accesses TYPE-C interface, protocol module power-on works and charger communication docking agreement, make the voltage of 21V of charger output, voltage output after protocol module controls switch module closure, to make boost-buck module work, simultaneously open protection module, output voltage is given battery charging, when removing charger, protection module is closed, prevent battery from feedback current leakage to charger.

[0023] Specifically, the protection module is electrically connected to the multiple string lithium batteries, wherein the TYPE-C interface includes an adapter USB1, the switch module includes a switch tube Q13 and a switch tube Q16, and the protection module includes a switch tube Q14; the No. 2 and No. 5 pins of the adapter USB1 are connected in series, one end of which is connected to the drain of the switch tube Q13, the source of the switch tube Q13 is connected to the ground through a capacitor C31, the other end of the No. 2 and No. 5 pins is connected to the base of the switch tube Q16 through a voltage stabilizing tube D14 and a resistor R72, the emitter of the switch tube Q16 is connected to the ground, and the collector is connected to the gate of the switch tube Q14 through a resistor R69, and the source and drain of the switch tube Q14 are connected between the boost-buck module and the multiple string lithium batteries.

[0024] In the embodiment, the protocol module includes a protocol controller U4, and the No. 11-13 pins of the protocol controller U4 are connected to the No. 5, No. 4 and No. 3 pins of the adapter USB1 in sequence, wherein the connection line between the No. 3 pin of the adapter USB1 and the No. 13 pin of the protocol controller U4 and the connection line between the No. 4 pin of the adapter USB1 and the No. 12 pin of the protocol controller U4 are connected to the ground through an electronic R66 and an electronic R67 in sequence, the No. 2 pin of the protocol controller U4 is connected to the connection circuit of the adapter USB1 and the switch tube Q13, and the No. 1 pin of the protocol controller U4 is connected to the gate of the switch tube Q13.

[0025] In the embodiment, the boost-buck module includes a controller U2, and the controller U2 is connected to a voltage regulating circuit, the No. 30-32 pins of the controller U2 are connected to the No. 16 pin of the protocol controller U4, the No. 17-19 pins of the controller U2 are connected to the drain of the switch tube Q14, and the source of the switch tube Q14 is connected to the lithium battery.

[0026] In the embodiment, the pin 31 of the controller U2 is connected with the pin 16 of the protocol controller U4 through the series connection of the resistor R23 and the resistor R20, the pin 32 of the controller U2 is connected with the pin 16 of the protocol controller U4 through the series connection of the resistor R22, and the capacitor C14 is connected in series between the pin 31 and the pin 32 of the controller U2.

[0027] In the embodiment, the controller U2 is further connected with a voltage feedback circuit, which comprises the resistor R39, the slide rheostat RP2 and the resistor R38. The resistor R39 and the slide rheostat RP2 are connected in series, one end of the series connection is connected to the drain end of the switch tube Q14, and the other end is connected to the pin 16 of the controller U2. The resistor R38 is connected in parallel across the slide rheostat RP2.

[0028] In the embodiment, the voltage regulating circuit comprises a first branch, which comprises the NMOS tube Q8 and the NMOS tube Q11. The drain of the NMOS tube Q8 is connected to the resistor R20. The source of the NMOS tube Q8 is connected to the drain of the NMOS tube Q11. The gate of the NMOS tube Q8 is connected with the pin 28 of the controller U2 through the series connection of the resistor R31 and the resistor R32. The source of the NMOS tube Q11 is connected to the pin 25 of the controller U2. The gate of the NMOS tube Q11 is connected with the pin 26 of the controller U2 through the series connection of the resistor R31 and the resistor R32. The diode D11 is connected in parallel across the resistor R32. The source of the NMOS tube Q11 is further connected to the pin 27 of the controller U2.

[0029] In the embodiment, the voltage regulating circuit further comprises a second branch, which comprises the NMOS tube Q10 and the NMOS tube Q12. The NMOS tube Q10 and the NMOS tube Q12 are connected with the pins 20-25 of the controller U2 in the same way as the NMOS tube Q8 and the NMOS tube Q11. The drain of the NMOS tube Q10 is connected to the drain of the switch tube Q14 through the series connection of the resistor R26.

[0030] In the embodiment, the inductor L1 is connected in series between the first branch and the second branch.

[0031] Working principle:

[0032] When the access device USB1 accesses the adapter supporting PD, the protocol controller U4 is powered on, and the protocol is connected through the 12th and 13th pins; after the connection is successful, the voltage of the 2nd and 5th pins of the access device USB1 is switched to 20V, at the same time, the 1st pin of the protocol controller U4 outputs a high level, the switch tube Q13 is turned on, and the VO outputs 20V voltage to the outside. When the protocol is not matched, the 2nd and 5th pins of the access device USB1 output 5V, at this time, the voltage stabilizing tube D14 is 5.6V and cannot make it conductive, so the switch tube Q16 is not turned on; when the protocol is matched successfully, the 2nd and 5th pins of the access device USB1 output 20V voltage, the voltage stabilizing tube D14 is broken down and turned on, and after passing through the R72, the base electrode of the switch tube Q16 is given, the switch tube Q16 is turned on, and the EN_OUT end is pulled down.

[0033] When the VO has 20V voltage, the controller U2 is powered on, and after passing through the NMOS tube Q8, the NMOS tube Q10, the NMOS tube Q11, the NMOS tube Q12 and the inductor L1, a preset voltage is output and detected by the resistance R26, and then reaches the drain electrode of the switch tube Q14.

[0034] When the access device USB1 outputs 20V, the 20V voltage passes through the voltage stabilizing tube D14 and the R72 to make the switch tube Q16 conductive, the EN_OUT is pulled down, at this time, the gate electrode of the switch tube Q14 is pulled down, the switch tube Q14 is a PMOS tube, after being pulled down, the switch tube Q14 is conductive, and the VBAT charges the battery. When the access device USB1 is not accessed by an external adapter or the protocol is not matched, the 2nd and 5th pins of the access device USB1 output less than 5V voltage, the voltage stabilizing tube D14 is not conductive, the switch tube Q13 is not conductive, the EN_OUT is a high level, the switch tube Q14 is not conductive, and the connection to the battery is cut off; the battery current is prevented from flowing back and leaking, and the battery is protected.

[0035] The above description is a detailed description of the preferred and feasible embodiment of the utility model, but the embodiment is not used to limit the patent application range of the utility model, and any equivalent change or modification change completed under the technical spirit of the utility model should belong to the patent range covered by the utility model.

Claims

1. A charging system for a plurality of lithium battery strings, characterized in that, The application relates to a lithium battery protection device, which comprises a TYPE-C interface, a protocol module, a switch module, a voltage-lifting and voltage-lowering module and a protection module connected in sequence, wherein the protection module is electrically connected with multiple lithium batteries; the TYPE-C interface comprises an access device USB1; the switch module comprises a switch tube Q13 and a switch tube Q16; the protection module comprises a switch tube Q14; the 2nd and 5th pins of the access device USB1 are connected in series, one end of the series connection is connected with the drain electrode of the switch tube Q13, the source electrode of the switch tube Q13 is connected with a capacitor C31 and then grounded, the other end of the series connection of the 2nd and 5th pins is connected with a zener diode D14 and a resistor R72 and then connected with the base electrode of the switch tube Q16, the emitter electrode of the switch tube Q16 is grounded, the collector electrode of the switch tube Q16 is connected with the gate electrode of the switch tube Q14 after being connected with a resistor R69, and the source electrode and the drain electrode of the switch tube Q14 are connected between the voltage-lifting and voltage-lowering module and the multiple lithium batteries. The protocol module comprises a protocol controller U4, the 11th-13th pins of the protocol controller U4 are connected with the 5th, 4th and 3rd pins of the access device USB1 in sequence, electronic resistors R66 and R67 are connected in series between the connection line between the 3rd pin of the access device USB1 and the 13th pin of the protocol controller U4 and between the connection line between the 4th pin of the access device USB1 and the 12th pin of the protocol controller U4 and then grounded, the 2nd pin of the protocol controller U4 is connected in the connection circuit of the access device USB1 and the switch tube Q13, and the 1st pin of the protocol controller U4 is connected with the gate electrode of the switch tube Q13.

2. The charging system of a plurality of lithium battery strings according to claim 1, wherein, The voltage-lifting and voltage-lowering module comprises a controller U2, the controller U2 is connected with a voltage regulating circuit, the 30th-32nd pins of the controller U2 are connected with the 16th pin of the protocol controller U4, the 17th-19th pins of the controller U2 are connected with the drain electrode of the switch tube Q14, and the source electrode of the switch tube Q14 is connected with the lithium battery.

3. A charging system for a plurality of series of lithium batteries as claimed in claim 2, wherein, The 31st pin of the controller U2 is connected in series with a resistor R23 and a resistor R20 and then connected with the 16th pin of the protocol controller U4, the 32nd pin of the controller U2 is connected in series with a resistor R22 and then connected with the 16th pin of the protocol controller U4, and a capacitor C14 is further connected in series between the 31st pin and the 32nd pin of the controller U2.

4. The charging system of claim 3, wherein, The controller U2 is further connected with a voltage feedback circuit, the voltage feedback circuit comprises a resistor R39, a slide rheostat RP2 and a resistor R38, the resistor R39 and the slide rheostat RP2 are connected in series, one end of the series connection is connected with the drain electrode of the switch tube Q14, the other end is connected with the 16th pin of the controller U2, and the resistor R38 is connected in parallel across the slide rheostat RP2.

5. A charging system for a plurality of series of lithium batteries as claimed in claim 4, wherein, ​ 6. The charging system of claim 4, wherein, The voltage regulating circuit comprises a first branch, the first branch comprises NMOS Q8 and NMOS Q11, the drain of the NMOS Q8 is connected with the resistor R20, the source of the NMOS Q8 is connected with the drain of the NMOS Q11, the gate of the NMOS Q8 is connected with the resistor R31 and the resistor R32 in series and then connected with the pin 28 of the controller U2, the source of the NMOS Q11 is connected with the pin 25 of the controller U2, the gate of the NMOS Q11 is connected with the resistor R31 and the resistor R32 in series and then connected with the pin 26 of the controller U2, the diode D11 is connected in parallel between the resistor R32, and the source of the NMOS Q11 is also connected with the pin 27 of the controller U2.

7. A charging system for a plurality of series of lithium batteries as claimed in claim 6, wherein, The voltage regulating circuit further comprises a second branch, the second branch comprises NMOS Q10 and NMOS Q12, the NMOS Q10 and the NMOS Q12 are connected with the pins 20-25 of the controller U2, the connection circuit is the same as the NMOS Q8 and the NMOS Q11, the drain of the NMOS Q10 is connected with the resistor R26 in series and then connected with the drain of the switch Q14.

8. A charging system for a plurality of series of lithium batteries as claimed in claim 7, wherein, The inductor L1 is connected in series between the first branch and the second branch.

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