CN210608578U - Self-adaptation BMS system board circuit that intelligence was judged - Google Patents

Abstract

The utility model relates to an intelligent self-adaptive BMS system board circuit, which comprises a protection board central processing module, an activation current and voltage module, an over-discharge protection and recovery module, an over-charge protection and recovery module and an over-current detection circuit; the activation current and voltage module is electrically connected with the protection board central processing module and the overcharge protection and recovery module respectively; the activation current voltage module, the over-discharge protection and recovery module, the over-charge protection and recovery module and the over-current detection circuit are electrically connected with the protection board central processing module; the over-current detection circuit is electrically connected with the over-discharge protection and recovery module; the overcharge protection and recovery module is also connected with a charging cathode of the battery; the protection board central processing module is also connected with an external voltage sampling socket. The utility model discloses can prevent that overcharge and overdischarge from appearing in the battery to the life of extension battery guarantees that the user uses battery safety.

Description

Self-adaptation BMS system board circuit that intelligence was judged

Technical Field

The utility model relates to a battery management field, especially an adaptive BMS system board circuit that intelligence was judged.

Background

Currently, electric moped has a wide market of users, so that various lithium ion batteries are widely applied. Therefore, the safety of lithium ion batteries is very important.

The lithium ion overcharge and overdischarge have corresponding potential safety hazards, if metal lithium is possibly separated out by overcharge, the metal lithium is in direct contact with air under the condition that a shell is broken, so that combustion is caused, meanwhile, electrolyte is ignited, strong flame is generated, gas rapidly expands, and explosion occurs.

Therefore, the performance of the existing safety control technology must be improved in the production and use processes of the lithium ion battery, and the lithium ion battery must be provided with a relatively perfect protection function to prevent overcharge, overdischarge and short circuit of the battery.

Disclosure of Invention

In view of this, the utility model aims at providing an adaptive BMS system board circuit that intelligence was judged prevents that overcharge and overdischarge from appearing in the battery to the life of extension battery and guarantee that the user uses battery safety.

The utility model discloses a following scheme realizes: an intelligent-judgment self-adaptive BMS system board circuit comprises a protection board central processing module, an activation current and voltage module, an over-discharge protection and recovery module, an over-charge protection and recovery module and an over-current detection circuit; the activation current and voltage module is electrically connected with the protection board central processing module and the overcharge protection and recovery module respectively; the over-discharge protection and recovery module, the over-charge protection and recovery module and the over-current detection circuit are electrically connected with the protection board central processing module; the over-current detection circuit is electrically connected with the over-discharge protection and recovery module; the overcharge protection and recovery module is also connected with a charging cathode of the battery; the protection board central processing module is also connected with an external voltage sampling socket.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses can prevent that overcharge and overdischarge from appearing in the battery to the life of extension battery guarantees that the user uses battery safety.

Drawings

Fig. 1 is a circuit diagram of a central processing module of a protection board according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of an active current-voltage module according to an embodiment of the present invention.

Fig. 3 is a circuit diagram of an over-discharge protection and recovery module according to an embodiment of the present invention.

Fig. 4 is a circuit diagram of the overcharge protection and recovery module according to the embodiment of the present invention.

Fig. 5 is a circuit diagram of the over-current detection circuit according to the embodiment of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

As shown in fig. 1 to 5, the present embodiment provides an intelligent self-adaptive BMS system board circuit, which includes a protection board central processing module, an active current and voltage module, an over-discharge protection and recovery module, an over-charge protection and recovery module, and an over-current detection circuit; the activation current and voltage module is electrically connected with the protection board central processing module and the overcharge protection and recovery module respectively; the over-discharge protection and recovery module, the over-charge protection and recovery module and the over-current detection circuit are electrically connected with the protection board central processing module; the over-current detection circuit is electrically connected with the over-discharge protection and recovery module; the overcharge protection and recovery module is also connected with a charging cathode of the battery; the protection board central processing module is also connected with an external voltage sampling socket.

In this embodiment, the connection mode of the central processing module of the protection board is as follows: the positive electrode of the battery core is connected with the B13 of the central processing module of the protection board, and the negative electrode of the battery core is connected with the B-of the central processing module of the protection board. The central processing module of the protection board is a charge-discharge same port, and P + and P-on the circuit board correspond to the positive and negative poles of the battery.

Preferably, in this embodiment, during the discharging process, the over-discharge protection and recovery module checks the voltage, and when the voltage is lower than the protection voltage, the central processing module of the protection board releases a signal to cut off the circuit connection, so as to stop discharging and play a role in protection; when the voltage is recovered to be higher than the discharge voltage, the signal is released through the central processing module of the protection board, and the discharge function is recovered. In the charging process, the overcharge protection and recovery module checks the voltage, and when the voltage is higher than the protection voltage, the protection board central processing module releases a signal to cut off the circuit connection, so that the protection effect is achieved; when the voltage is recovered to be lower than the chargeable voltage, the signal is released through the central processing module of the protection board, and the charging function is recovered.

The present embodiment is in the role of "battery manager", and is applied to rechargeable lithium battery packs such as lithium ion and polymer lithium batteries, and the like, and is provided with a specific overcharge protection voltage, overcharge recovery voltage, overdischarge protection voltage, discharge protection mode, and the like. The intelligent management of the battery and each unit is really realized by coping with various scenes of the lithium ion battery in the using process. In this embodiment, the current-voltage module is activated to perform level conversion, and the battery voltage is converted into the operating power supply of the BMS system board through the voltage dividing circuit, thereby providing a stable voltage to drive the MOS transistor and ensuring the normal operation of the entire system. Protection board central processing module, overcharge protection: when the voltage of one battery is above the overcharge protection voltage, after the non-induction delay time set by the capacitance value connected on the COV terminal, the OV end connected with the peripheral pull-down resistor outputs: and in a high-resistance state, the MOS tube for controlling charging is closed, and the charging is cut off. When each section voltage of the battery is below the overcharge release voltage, the OV terminal outputs high level, and the overcharge protection state is released. Over-discharge protection: when the voltage of one battery is below the over-discharge protection voltage and after the non-induction delay time set by the capacitance value connected to the CDC terminal, the DCHG terminal outputs low level, the discharge control MOS tube is closed, the discharge is stopped, and when the voltage of each battery is above the discharge re-opening voltage, the DCHG terminal outputs high level, and the over-discharge protection state is released. Overcurrent and short-circuit protection function: in the dischargeable state, when the voltage of the CS terminal is equal to or higher than the overcurrent protection voltage and equal to or lower than the short-circuit protection voltage due to a short-circuit of the load, the state is an overcurrent protection state. When the CS terminal voltage is equal to or higher than the short-circuit protection voltage, this state is short-circuit protection, and after overcurrent and protection, the DCHG terminal outputs a low level after a non-induction delay time set by the capacitance value connected to the COL1 terminal, and the discharge control MOS transistor is turned off, and discharge is stopped. The overcurrent and short-circuit protection state is released by disconnecting the load, and after the load is disconnected, when the voltage of the V-terminal is lower than the voltage of the overcurrent release V-terminal through the internal pull-down resistor, the DCHG terminal outputs high level, and the overcurrent and short-circuit protection state is released. The lithium battery protection IC is mainly used for a secondary lithium battery/polymer battery to improve the utilization rate of the battery, prevent the battery from being overcharged and overdischarged and improve the use safety of the lithium battery. In this embodiment, when the overdischarge protection and recovery module discharges, the discharge is stopped as long as the voltage of one battery is below the overdischarge protection voltage, and when all the battery voltages are above the overdischarge release voltage, the protection state is released. The discharge starting and closing functions are achieved by controlling the on-off of the discharge MOS tube.

In this embodiment, when the overcharge protection and recovery module is charged, the charging is stopped as long as the voltage of one battery is equal to or higher than the overcharge protection voltage, and when the voltage of all the batteries is equal to or lower than the overcharge release voltage, the protection state is released. The charging starting and closing functions are achieved by controlling the on-off of the charging MOS tube.

In this embodiment, the overcurrent detection circuit is used to detect the current in the loop and feed back the current to the protection IC.

Preferably, in this embodiment, each battery is connected to the protection board central processing module, the protection board central processing module monitors the voltage and current status of the battery, when the battery voltage is lower than the over-discharge protection voltage during discharging, the protection board central processing module controls the over-discharge protection module to stop discharging the battery, and when the battery voltage is higher than the over-discharge recovery voltage, the protection IC controls the over-discharge recovery module to continue discharging the battery. When the voltage of the battery is higher than the overcharge protection voltage during charging, the protection board central processing module controls the overcharge protection module to stop charging the battery, and when the voltage of the battery is recovered to the overcharge recovery voltage, the protection IC controls the overcharge recovery module to continue charging the battery.

It is worth mentioning that the utility model protects a hardware structure, as for the control method does not require protection. The above is only a preferred embodiment of the present invention. However, the present invention is not limited to the above embodiments, and any equivalent changes and modifications made according to the present invention do not exceed the scope of the present invention, and all belong to the protection scope of the present invention.

Claims (1)

1. The utility model provides an adaptive BMS system board circuit that intelligence was judged which characterized in that: the protection board protection device comprises a protection board central processing module, an activation current and voltage module, an over-discharge protection and recovery module, an over-charge protection and recovery module and an over-current detection circuit; the activation current and voltage module is electrically connected with the protection board central processing module and the overcharge protection and recovery module respectively; the over-discharge protection and recovery module, the over-charge protection and recovery module and the over-current detection circuit are electrically connected with the protection board central processing module; the over-current detection circuit is electrically connected with the over-discharge protection and recovery module; the overcharge protection and recovery module is also connected with a charging cathode of the battery; the protection board central processing module is also connected with an external voltage sampling socket.

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