CN213959741U - Passive switch circuit of lithium battery management system - Google Patents
Passive switch circuit of lithium battery management system Download PDFInfo
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- CN213959741U CN213959741U CN202022677981.7U CN202022677981U CN213959741U CN 213959741 U CN213959741 U CN 213959741U CN 202022677981 U CN202022677981 U CN 202022677981U CN 213959741 U CN213959741 U CN 213959741U
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- switch
- management system
- lithium battery
- battery management
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model relates to a lithium battery management system's passive switch circuit, characterized by: the lithium battery management system comprises a passive switch K1, an MCU control K3 and a passive switch K1, wherein the passive switch K1 is used for electrifying the lithium battery management system, and an outgoing line of the passive switch is connected with an external self-locking switch, so that a circuit board is prevented from being damaged due to short circuit in the process; the MCU controls the K3 to directly control the on-off of the triode and start/close the lithium battery management system. Has the advantages that: in the passive switch K1 of the utility model, the outgoing line is connected with the external self-locking switch, and the circuit board is not damaged by short circuit in the process; the switch detection K2 is used for detecting whether the switch K1 is closed or not, feeding back the MCU in time and judging that the system can be powered off in time; the MCU controls the K3 to directly control the on/off of the triode and close the on/off system. The lithium battery management system adopting the passive power-on mode can effectively avoid the problem that the circuit board is damaged by external short circuit.
Description
Technical Field
The utility model belongs to the technical field of lithium ion management system, especially, relate to a lithium battery management system's passive switch circuit.
Background
The lithium ion battery pack is a rechargeable battery, and the lithium ion battery pack is seriously damaged by overcharge, overdischarge and excessive high temperature use. The lithium ion storage battery pack is matched with a battery pack management system, so that the battery pack can be well operated in a good working state.
The lithium battery management system is powered on in an external power supply mode and an internal power supply mode. Wherein, the vehicle-mounted high-voltage system mostly adopts the external 24V and 12V power supply forms; the use of 48V low pressure control system is mostly interior power supply mode, gets the group battery total electricity promptly, supplies power for the chip through the DCDC circuit again. The traditional method is to adopt a BAT + disconnection mode to control the power on and power off of a system. The technical defects of the mode are as follows: in the process of leading the switch wire out, the short circuit condition of the switch wire is easily caused, and the circuit board is damaged.
Aiming at the defects of the prior art, a lithium battery management system adopting a passive power-on mode is urgently needed to be developed, so that the problem that an external short circuit damages a circuit board can be effectively avoided.
SUMMERY OF THE UTILITY MODEL
The utility model relates to an overcome not enough among the prior art, provide a lithium battery management system's passive switch circuit, to the optimization of lithium ion battery management system's last electric mode, to the passive last electric mode of lithium battery management system's adoption, effectively avoided the influence of outside short circuit to the circuit board, electric system on the control that can be nimble.
The utility model discloses a realize above-mentioned purpose, realize through following technical scheme, a lithium battery management system's passive switch circuit, characterized by: comprising a passive switch K1 and an MCU control K3,
the passive switch K1 is used for electrifying the lithium battery management system, and an outgoing line of the passive switch K1 is connected with an external self-locking switch to ensure that a circuit board cannot be damaged even if short circuit occurs in the process;
and the MCU control K3 directly controls the on-off of the triode and turns on/off the lithium battery management system.
The passive switch K1 is connected in series on a grid circuit of the PMOS, one end of the K1 is connected on the grid through a resistor, and the other end of the K1 is grounded through the PTC.
A switch detection K2 is connected between the passive switch K1 and the MCU, the switch detection K2 is used for detecting the state of the K1, when the K2 detects that the switch is disconnected, the MCU controls the K3 to close the PMOS, and the lithium battery management system is powered off.
Has the advantages that: compared with the prior art, the outgoing line of the passive switch K1 of the utility model is connected with the external self-locking switch, so that the circuit board is not damaged by short circuit in the process; the switch detection K2 is used for detecting whether the switch K1 is closed or not, feeding back the MCU in time and judging that the system can be powered off in time; the MCU controls the K3 to directly control the on/off of the triode and close the on/off system. The lithium battery management system adopting the passive power-on mode can effectively avoid the problem that the circuit board is damaged by external short circuit.
Drawings
FIG. 1 is a circuit diagram of a passive power-on switch for a lithium battery management system;
FIG. 2 is a switch detection circuit diagram;
fig. 3 is an overall circuit diagram of the power supply portion of the power management system.
Detailed Description
The following detailed description of the embodiments according to the present invention with reference to the preferred embodiments is as follows: referring to the attached drawings in detail, the embodiment provides a passive switch circuit of a lithium battery management system, which comprises a passive switch K1, an MCU control K3 and a passive switch K1, wherein the passive switch K1 and the MCU control K3 are used for electrifying the lithium battery management system, and lead wires of the passive switch K1 are connected with an external self-locking switch, so that a circuit board cannot be damaged even if short circuit occurs in the process; the MCU controls the K3 to directly control the on-off of the triode and start/close the lithium battery management system. The passive switch K1 is connected in series on a grid circuit of the PMOS, one end of the K1 is connected on the grid through a resistor, and the other end of the K1 is grounded through the PTC. A switch detection K2 is connected between the passive switch K1 and the MCU, the switch detection K2 is used for detecting the state of the K1, when the K2 detects that the switch is disconnected, the MCU controls the K3 to close the PMOS, and the lithium battery management system is powered off.
Working process
For example, as shown in fig. 1, the passive switch K1 is connected in series to the gate circuit of the PMOS, when the switch K1 is closed, the C61 and the C62 are charged, at this time, the GS of the PMOS has voltage, the MOS transistor is turned on instantly, the post-stage DCDC circuit works, the MCU obtains 5V power supply, the program is initialized, the enable K3 is enabled, the triode is closed, the PMOS is turned on for a long time, and the lithium battery management system starts to work.
One end of the K1 is connected with the grid electrode through the resistor, and the other end is connected with the ground through the PTC, so that when the two ends are externally short-circuited, the circuit board cannot be damaged, and the safety of the system is improved.
The switch detection K2 shown in FIG. 2 is used for detecting the state of K1 and feeding back the state to the MCU. When K1 is disconnected, when K2 detects that the switch is disconnected, the MCU detects that the switch is disconnected, at the moment, K3 is controlled, the PMOS is closed, the rear-stage DCDC input is cut off, and the lithium battery management system is powered off.
K1, K2 and K3 are matched with each other to complete the power-on and power-off control of the lithium battery pack management system.
The MCU has two pins that are dedicated to power. VCC is connected with the positive electrode of the power supply, GND is connected with the negative electrode, but the power supply is not electrified, the electrification is to turn on the power supply switch, and the power supply switch is electrified, so that the MCU starts to operate at the moment. And the MCU control K3 is used for controlling the power-off of the lithium battery management system by the MCU. And when the passive switch K1 is closed, the K3 is enabled, and the lithium battery management system is powered on. And meanwhile, the switch detection K2 reports the switch state to the MCU, and when the switch disconnection is detected, the MCU controls the K3, so that the power-off purpose of the lithium battery management system is achieved. The three are mutually matched to form a passive switch circuit of the lithium battery management system.
The above detailed description of the passive switch circuit of the lithium battery management system with reference to the embodiments is illustrative and not restrictive, and several embodiments can be enumerated within the scope of the present disclosure, so that changes and modifications without departing from the general concept of the present disclosure should fall within the protection scope of the present disclosure.
Claims (3)
1. A kind of lithium battery management system's passive switch circuit, its characteristic is: comprising a passive switch K1 and an MCU control K3,
the passive switch K1 is used for electrifying the lithium battery management system, and an outgoing line of the passive switch K1 is connected with an external self-locking switch to ensure that a circuit board cannot be damaged even if short circuit occurs in the process;
and the MCU control K3 directly controls the on-off of the triode and turns on/off the lithium battery management system.
2. The passive switching circuit of a lithium battery management system of claim 1, wherein: the passive switch K1 is connected in series on a grid circuit of the PMOS, one end of the K1 is connected on the grid through a resistor, and the other end of the K1 is grounded through the PTC.
3. The passive switching circuit of a lithium battery management system of claim 1, wherein: a switch detection K2 is connected between the passive switch K1 and the MCU, the switch detection K2 is used for detecting the state of the K1, when the K2 detects that the switch is disconnected, the MCU controls the K3 to close the PMOS, and the lithium battery management system is powered off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022677981.7U CN213959741U (en) | 2020-11-18 | 2020-11-18 | Passive switch circuit of lithium battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022677981.7U CN213959741U (en) | 2020-11-18 | 2020-11-18 | Passive switch circuit of lithium battery management system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213959741U true CN213959741U (en) | 2021-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022677981.7U Active CN213959741U (en) | 2020-11-18 | 2020-11-18 | Passive switch circuit of lithium battery management system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213959741U (en) |
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2020
- 2020-11-18 CN CN202022677981.7U patent/CN213959741U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 4-6, Lanyuan Road, Huayuan Industrial Zone, Binhai New Area, Tianjin 300384 Patentee after: Tianjin Lantian Special Power Technology Co.,Ltd. Address before: No.38, South Haitai Road, Binhai high tech Industrial Development Zone, Binhai New Area, Tianjin Patentee before: TIANJIN LISHEN SPECIAL POWER TECHNOLOGY CO.,LTD. |
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| CP03 | Change of name, title or address |