CN213213146U - Low-cost BMS charge-discharge secondary protection device - Google Patents
Low-cost BMS charge-discharge secondary protection device Download PDFInfo
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- CN213213146U CN213213146U CN202022019721.0U CN202022019721U CN213213146U CN 213213146 U CN213213146 U CN 213213146U CN 202022019721 U CN202022019721 U CN 202022019721U CN 213213146 U CN213213146 U CN 213213146U
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Abstract
The utility model discloses a low-cost BMS charge-discharge secondary protection device relates to the technical field of lithium cell, including BMS mainboard, the machine that charges, load, battery BAT1, group battery end fuse F1, the MOS pipe Q1 that charges, the MOS pipe Q2 and resistance R1 that discharge, its characterized in that: still be equipped with the secondary protection module that charges, this secondary protection module that charges and F1, BAT1, R1, Q2, Q1, the machine that charges establish ties and constitute the charging circuit, load and F1, BAT1, R1, Q2 establish ties and constitute the return circuit that discharges, the BMS mainboard is equipped with control interface and communication interface, and control interface connects the secondary protection module that charges, and communication interface connects the load, the utility model discloses have the function that prevents battery overcharge and overdischarge.
Description
Technical Field
The utility model relates to a technical field of lithium cell, concretely relates to low-cost BMS charge-discharge secondary protection device.
Background
A Battery Management System (Battery Management System), which is a System for managing a Battery, referred to as BMS for short, is mainly used to prevent overcharge and overdischarge of the Battery, reduce safety risks, and prolong the service life of the Battery. In industrial control, the BMS collects data of voltage, current, temperature, etc., and its primary purpose is to control the turn-on and turn-off of the power switch, thereby protecting the battery. In the prior art, the BMS scheme has the characteristic of diversification, and a breaking position is provided with a breaking positive electrode and a breaking negative electrode; the power switch is provided with a relay, an MOS tube, an IGBT and the like; the charging and discharging interface is provided with a charging and discharging same port and a charging and discharging branch port. The BMS designed aiming at the application of the medium and small power batteries adopts an MOS tube as a power switch, more schemes of breaking a negative electrode are provided, a charging and discharging interface can be divided into a charging and discharging same-port design and a charging and discharging port design, and the charging and discharging port design is widely adopted due to the lower cost.
However, this solution has obvious defects, and the following two points are mainly included from the viewpoint of failure mode analysis: 1. when the charging MOS tube Q1 is failed and short-circuited, the implementation of the charging overvoltage protection function of the BMS is failed, the charger continuously charges the battery BAT1, the whole process is uncontrollable, after the battery is used for a period of time, the pressure difference between the batteries connected in series is gradually increased, the charger continuously charges the battery, and the battery is possibly overcharged, so that serious safety accidents such as smoke, fire, even explosion and the like of the battery are caused; 2. when the MOS pipe Q2 that discharges became invalid short circuit back, can lead to BMS's the undervoltage protection function that discharges to carry out and become invalid, battery BAT1 is to load continuous discharge, and whole process is uncontrollable, if this trouble fails in time to discover, can lead to battery "take a illness to operate", causes other secondary fault, like battery overdischarge etc..
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a low-cost BMS charge-discharge secondary protection device has solved and has proposed overcharge and overdischarge's problem in the above-mentioned background art.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a low-cost BMS charge-discharge secondary protection device comprises a BMS mainboard, a charger, a load, a battery BAT1, a battery pack end fuse F1, a charging MOS tube Q1, a discharging MOS tube Q2, a resistor R1 and a charging secondary protection module, wherein two ends of the charging secondary protection module are respectively connected with the positive electrode of the battery pack end fuse F1 and the charger, the other end of the battery pack end fuse F1 is connected with the positive electrode of the battery BAT1, the negative electrode of the battery BAT1 is connected with the resistor R1, the other end of the resistor R1 passes through the discharging MOS tube Q2, the negative electrode of the charger is connected behind the charging MOS tube Q1, the positive electrode of the load is connected with the middle of the battery pack end fuse F1 and the charging secondary protection module, the negative electrode of the load is connected with the middle of the charging MOS tube Q1 and the discharging MOS tube Q2, the BMS mainboard is provided with a control interface and a.
Preferably, the charging secondary protection module is a relay or a three-terminal fuse.
Preferably, the G pole of the charging MOS transistor Q1 is connected to the BMS board, the S pole is connected to the negative electrode of the charger, and the D pole is connected to the D pole of the discharging MOS transistor Q2.
Preferably, the G pole of the discharging MOS transistor Q2 is connected to the BMS board, the S pole is connected to the resistor R1, and the D pole is connected to the D pole of the charging MOS transistor Q1.
The utility model provides a low-cost BMS charge-discharge secondary protection device possesses following beneficial effect:
(1) in the charging mode, after the BMS mainboard detects that the charging MOS tube Q1 is short-circuited and fails, the BMS mainboard controls the charging secondary protection module to be disconnected, cuts off a charging loop, stops charging the battery BAT1 and prevents the battery from being overcharged;
(2) the communication interface of load and BMS mainboard is connected, and under the discharge mode, the BMS mainboard detects the short circuit failure back of discharging MOS pipe Q2, sends fault information to the load through communication interface, closes power stop work behind the load receipt information, prevents that the battery from discharging excessively.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1, the present invention provides a technical solution: a low-cost BMS charge-discharge secondary protection device comprises a BMS mainboard, a charger, a load, a battery BAT1, a battery pack end fuse F1, a charge MOS tube Q1, a discharge MOS tube Q2, a resistor R1 and a charge secondary protection module, wherein two ends of the charge secondary protection module are respectively connected with the battery pack end fuse F1 and the anode of the charger, the other end of the battery pack end fuse F1 is connected with the anode of the battery BAT1, the cathode of the battery BAT1 is connected with the resistor R1, the other end of the resistor R1 passes through the discharge MOS tube Q2, the charge MOS tube Q1 is connected with the cathode of the charger, the load anode is connected with the middle of the battery pack end fuse F1 and the charge secondary protection module, the load cathode is connected with the middle of the charge MOS tube Q1 and the discharge MOS tube Q2, the BMS mainboard is provided with a control interface and a communication interface, the control interface is connected with the charge secondary protection module, the communication interface is connected with the load, the charging MOS pipe Q1 is a ChgMOS pipe, the G pole of the charging MOS pipe Q1 is connected with the BMS mainboard, the S pole is connected with the negative pole of the charger, the D pole is connected with the D pole of the discharging MOS pipe Q2, the discharging MOS pipe Q2 is a DsgMOS pipe, the G pole of the discharging MOS pipe Q2 is connected with the BMS mainboard, the S pole is connected with the resistor R1, and the D pole is connected with the D pole of the charging MOS pipe Q1.
The utility model discloses in, the secondary protection module that charges is relay or three-terminal fuse, its and group battery end fuse F1, battery BAT1, resistance R1, discharge MOS pipe Q2, the MOS pipe Q1 charges, charge the machine and establish ties and constitute the charging circuit, this secondary protection module that charges still with the control interface connection of BMS mainboard, accessible control interface active control fusing, under the charging mode, the BMS mainboard detects the MOS pipe Q1 short circuit that charges and became invalid after, the disconnection of control secondary protection module that charges, cut off the charging circuit, stop to charge battery BAT1, prevent battery overcharge, thereby arouse the battery smoking, fire, serious incident such as explosion even.
Load and group battery end fuse F1, battery BAT1, resistance R1, discharge MOS pipe Q2 establish ties and constitute the return circuit that discharges, this load still is connected with the communication interface of BMS mainboard, the trouble information that the BMS mainboard sent can be received to this communication interface, under the discharge mode, the BMS mainboard detects discharge MOS pipe Q2 short circuit failure back, send the trouble information to the load through communication interface, the power shutdown stop work after the load received the information, prevent that the battery from overdischarging, thereby lead to the unable use of recharging of battery and arouse other secondary failures.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (4)
1. The utility model provides a low-cost BMS charge-discharge secondary protection device, includes BMS mainboard, machine that charges, load, battery BAT1, group battery end fuse F1, the MOS pipe Q1 that charges, the MOS pipe Q2 and resistance R1 of discharging, its characterized in that: still be equipped with the secondary protection module that charges, the secondary protection module that charges both ends connect the positive pole of group battery end fuse F1 and machine of charging respectively, the positive pole of group battery end fuse F1 other end connection battery BAT1, battery BAT 1's negative pole connecting resistance R1, the resistance R1 other end is through discharging MOS pipe Q2, the machine negative pole that charges is connected behind the MOS pipe Q1, the load anodal battery end fuse F1 and the middle of the secondary protection module that charges, the load negative pole is connected and is charged MOS pipe Q1 and the middle of discharging MOS pipe Q2, the BMS mainboard is equipped with control interface and communication interface, control interface connection charges the secondary protection module, communication interface connection load.
2. A low-cost BMS charging and discharging secondary protection device according to claim 1, characterized in that: the secondary protection module for charging is a relay or a three-terminal fuse.
3. A low-cost BMS charging and discharging secondary protection device according to claim 1, characterized in that: the G pole of the charging MOS tube Q1 is connected with the BMS mainboard, the S pole is connected with the negative pole of the charger, and the D pole is connected with the D pole of the discharging MOS tube Q2.
4. A low-cost BMS charging and discharging secondary protection device according to claim 1, characterized in that: the G pole of the discharging MOS tube Q2 is connected with the BMS mainboard, the S pole is connected with the resistor R1, and the D pole is connected with the D pole of the charging MOS tube Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022019721.0U CN213213146U (en) | 2020-09-16 | 2020-09-16 | Low-cost BMS charge-discharge secondary protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022019721.0U CN213213146U (en) | 2020-09-16 | 2020-09-16 | Low-cost BMS charge-discharge secondary protection device |
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| Publication Number | Publication Date |
|---|---|
| CN213213146U true CN213213146U (en) | 2021-05-14 |
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| CN202022019721.0U Active CN213213146U (en) | 2020-09-16 | 2020-09-16 | Low-cost BMS charge-discharge secondary protection device |
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| CN (1) | CN213213146U (en) |
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- 2020-09-16 CN CN202022019721.0U patent/CN213213146U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A low cost secondary protection device for BMS charging and discharging Effective date of registration: 20210630 Granted publication date: 20210514 Pledgee: Changhe Branch of Hangzhou United Rural Commercial Bank Co.,Ltd. Pledgor: Hangzhou youenjie Technology Co.,Ltd. Registration number: Y2021330000747 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20221213 Granted publication date: 20210514 Pledgee: Changhe Branch of Hangzhou United Rural Commercial Bank Co.,Ltd. Pledgor: Hangzhou youenjie Technology Co.,Ltd. Registration number: Y2021330000747 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |