Power battery system for preventing over-discharge of a battery

Abstract

The utility model discloses a kind of power battery systems to prevent battery overdischarge, it is related to electric vehicle technical field, including lithium battery BAT, the positive pole of lithium battery BAT is electrically connected the normally open contact of relay KM1, the normally open contact of relay KM1 is electrically connected the DC1+ terminal of DC-DC converter, the DC2+ terminal of DC-DC converter is electrically connected manual switch SB1, manual switch SB1 is electrically connected the V+ terminal of battery management system, the V- terminal of battery management system is electrically connected the DC2- terminal of DC-DC converter, the DC1- terminal of DC-DC converter is electrically connected the negative pole of the lithium battery BAT;The coil of relay KM1 is electrically connected the mos pipe output terminal of the battery management system.The utility model can effectively prevent lithium battery overdischarge, guarantee the use safety of lithium battery, to prolong the service life of lithium battery.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, and in particular to a power battery system for preventing excessive battery discharge. Background Technology

[0002] A power battery system is a system composed of a lithium battery, a battery management system (BMS), a DC-DC converter, and other auxiliary devices and a housing. It provides power to electric vehicles, electric cylinders, and other similar tools. The lithium battery supplies power to the DC-DC converter; the lithium battery voltage is converted by the DC-DC converter to become the supply voltage for the BMS, which in turn supplies power to the BMS. This power supply circuit is controlled by a manual switch. When the manual switch is turned on, the BMS operates, consuming lithium battery power. In daily use, users often forget to turn off the manual switch, leaving it continuously on. This causes the lithium battery to continuously consume power, potentially leading to over-discharge and shortening its lifespan. Utility Model Content

[0003] To address the above deficiencies, the purpose of this utility model is to provide a power battery system that prevents excessive battery discharge. This power battery system can effectively prevent lithium batteries from being over-discharged, ensuring the safety of lithium battery use and thus extending the service life of lithium batteries.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A power battery system for preventing over-discharge includes a lithium battery BAT. The positive terminal of the lithium battery BAT is electrically connected to the normally open contact of a relay KM1. The normally open contact of the relay KM1 is electrically connected to the DC1+ terminal of a DC-DC converter. The DC2+ terminal of the DC-DC converter is electrically connected to a manual switch SB1. The manual switch SB1 is electrically connected to the V+ terminal of a battery management system. The V- terminal of the battery management system is electrically connected to the DC2- terminal of the DC-DC converter. The DC1- terminal of the DC-DC converter is electrically connected to the negative terminal of the lithium battery BAT. The coil of the relay KM1 is electrically connected to the output terminal of the MOSFET of the battery management system.

[0005] It also includes a charger auxiliary power supply, the Vout+ terminal of which is simultaneously electrically connected to the DC2+ terminal of the DC-DC converter and the manual switch SB1, and the Vout- terminal of which is simultaneously electrically connected to the DC2- terminal of the DC-DC converter and the V- terminal of the battery management system.

[0006] The DC2+ terminal of the DC-DC converter is electrically connected to the positive terminal of diode D1, and the negative terminal of diode D1 is electrically connected to the manual switch SB1.

[0007] The Vout+ terminal of the charger's auxiliary power supply is electrically connected to the positive terminal of diode D2, and the negative terminal of diode D2 is simultaneously electrically connected to the negative terminal of diode D1 and the manual switch SB1.

[0008] The DC-DC converter in question is model DDM-3KDS-01.

[0009] After adopting the above technical solution, the beneficial effects of this utility model are: This utility model's power battery system for preventing over-discharge includes a lithium battery BAT. The positive terminal of the lithium battery BAT is electrically connected to the normally open contact of a relay KM1. The normally open contact of relay KM1 is electrically connected to the DC1+ terminal of a DC-DC converter. The DC2+ terminal of the DC-DC converter is electrically connected to a manual switch SB1. The manual switch SB1 is electrically connected to the V+ terminal of a battery management system. The V- terminal of the battery management system is electrically connected to the DC2- terminal of the DC-DC converter. The DC1- terminal of the DC-DC converter is electrically connected to the negative terminal of the lithium battery BAT. The coil of relay KM1 is electrically connected to the output terminal of the MOSFET of the battery management system. If the user forgets to disconnect the manual switch, the lithium battery may continue to discharge for an extended period. When the battery management system detects that the lithium battery has reached its depletion level, it will actively control the coil of relay KM1 to de-energize, causing its normally open contact to open and disconnecting the circuit between the lithium battery and the DC-DC converter. The DC-DC converter and the battery management system will no longer consume the lithium battery's power, and the lithium battery will stop discharging, thus preventing over-discharge, ensuring the safety of the lithium battery, and extending its lifespan.

[0010] In summary, the power battery system for preventing over-discharge of the present invention solves the technical problems of over-discharge of lithium batteries in the prior art. The power battery system for preventing over-discharge of the present invention can effectively prevent over-discharge of lithium batteries, ensure the safety of lithium battery use, and thus extend the service life of lithium batteries. Attached Figure Description

[0011] Figure 1 This is a circuit diagram of a power battery system for preventing over-discharge of the battery according to this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] The directions mentioned in this manual are based on the directions shown in the attached diagram and represent only relative positional relationships, not absolute positional relationships.

[0014] like Figure 1 As shown, a power battery system for preventing over-discharge includes a lithium battery BAT. The positive terminal of the lithium battery BAT is electrically connected to the normally open contact of a relay KM1. The normally open contact of relay KM1 is electrically connected to the DC1+ terminal of a DC-DC converter. The DC2+ terminal of the DC-DC converter is electrically connected to a manual switch SB1. The manual switch SB1 is electrically connected to the V+ terminal of a battery management system. The V- terminal of the battery management system is electrically connected to the DC2- terminal of the DC-DC converter. The DC1- terminal of the DC-DC converter is electrically connected to the negative terminal of the lithium battery BAT. The coil of relay KM1 is electrically connected to the output terminal of the MOSFET of the battery management system. When the battery management system detects that the voltage of the lithium battery BAT has reached the undervoltage protection threshold, it controls the coil of relay KM1 to be de-energized, thereby opening the normally open contact of relay KM1 and disconnecting the power supply circuit of the lithium battery BAT, thus preventing the lithium battery BAT from over-discharging. When the battery management system detects that the voltage of the lithium battery BAT has recovered, it controls the coil of relay KM1 to be energized, closing the normally open contact of relay KM1, and the lithium battery BAT continues to supply power to the battery management system. In this embodiment, the preferred DC-DC converter is model DDM-3KDS-01, with specifications of DC600V / DC28V.

[0015] like Figure 1 As shown, the power battery system of this utility model for preventing over-discharge of the battery also includes a charger auxiliary power supply. The Vout+ terminal of the charger auxiliary power supply is electrically connected to the front end of the manual switch SB1. That is, the Vout+ terminal of the charger auxiliary power supply is simultaneously electrically connected to the DC2+ terminal of the DC-DC converter and the manual switch SB1, and the Vout- terminal of the charger auxiliary power supply is simultaneously electrically connected to the DC2- terminal of the DC-DC converter and the V- terminal of the battery management system. After the normally open contact of the relay KM1 is opened, the lithium battery BAT is charged by the mains power and no longer supplies power to the battery management system. At this time, the charger auxiliary power supply will continue to supply power to the battery management system, so that the operation of the battery management system will not be affected when the lithium battery BAT is charging.

[0016] like Figure 1 As shown above, the power battery system for preventing over-discharge of this utility model includes two power supply circuits: The first power supply circuit consists of a lithium battery BAT, a relay KM1, a DC-DC converter, a manual switch SB1, and a battery management system. Current flows out from the positive terminal of the lithium battery BAT, passes through the normally open contact of the relay KM1, the positive terminal of the DC-DC converter, and the manual switch SB1, and enters the positive power terminal V+ of the battery management system to supply power to the battery management system. The current returning from the negative power terminal V- of the battery management system flows through the negative terminal of the DC-DC converter back to the negative terminal of the lithium battery BAT, forming a power supply circuit.

[0017] The second power supply circuit consists of the charger auxiliary power supply, manual switch SB1, and battery management system. Current flows out from the positive terminal Vout+ of the charger auxiliary power supply, passes through manual switch SB1, and enters the positive terminal V+ of the battery management system to supply power to the battery management system. The current returning from the negative terminal V- of the battery management system goes directly back to the negative terminal Vout- of the charger auxiliary power supply, forming a power supply circuit.

[0018] To prevent current backflow in the two power supply circuits, this embodiment connects a diode D1 in series between the DC-DC converter and the manual switch SB1 in the first power supply circuit, and connects a diode D2 in series between the charger auxiliary power supply and the manual switch SB1 in the second power supply circuit.

[0019] in: The DC2+ terminal of the DC-DC converter is electrically connected to the anode of diode D1, and the cathode of diode D1 is electrically connected to manual switch SB1, and also to the cathode of diode D2. The Vout+ terminal of the charger's auxiliary power supply is electrically connected to the anode of diode D2, and the cathode of diode D2 is electrically connected to manual switch SB1, and also to the cathode of diode D1. This creates a current node between the first and second power supply circuits at the cathodes of diodes D1 and D2 and the manual switch SB1. Due to the unidirectional conduction of diodes D1 and D2, the current in both circuits flows only to manual switch SB1 at this node, i.e., to the battery management system, supplying power to the battery management system, and will not flow back to the other power supply circuit through this node. This effectively improves the operational safety and stability of the power battery system in this invention, which prevents over-discharge of the battery.

[0020] like Figure 1 As shown, the working principle of the power battery system for preventing over-discharge of this utility model is as follows: The normally open contact of relay KM1 is controlled by the battery management system. Under normal operating conditions, the normally open contact of relay KM1 is closed, and the lithium battery BAT supplies power to the battery management system. If the user forgets to disconnect the manual switch SB1, the lithium battery BAT will continue to discharge for an extended period. When the battery management system detects that the lithium battery BAT has run out of power, i.e., when the voltage of the lithium battery BAT reaches the low voltage protection threshold, the battery management system controls the coil of relay KM1 to de-energize, causing the normally open contact of relay KM1 to open, thereby cutting off the first power supply circuit. The downstream DC-DC converter and the battery management system no longer consume power from the lithium battery BAT, ensuring that the lithium battery BAT is not over-discharged.

[0021] After the lithium battery BAT is completely discharged, the battery management system disconnects relay KM1, and the power battery system stops operating. When the user discovers that the power battery system is out of power, they connect to the mains power to supply power to the power battery system. At this time, the charger's auxiliary power supply is awakened by the mains power and supplies power to the battery management system through a second power supply circuit. After being powered on, the battery management system is activated and continues to monitor the status of the lithium battery BAT in real time. At the same time, it communicates with the charger. Upon receiving the charger's online instruction, it sends a charging instruction to the charger for the lithium battery BAT. The charger begins to charge the lithium battery BAT, and the voltage of the lithium battery BAT gradually rises to the normal operating state. At this point, after the battery management system detects that the lithium battery BAT status is normal, it energizes the coil of relay KM1, controlling the normally open contact of relay KM1 to close, and the entire power battery system returns to its initial normal operating state.

[0022] In summary, the power battery system of this invention for preventing over-discharge of lithium batteries can effectively prevent over-discharge of lithium batteries, ensure the safety of lithium battery use, and thus extend the service life of lithium batteries.

[0023] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.

Claims

1. A power battery system for preventing over-discharge of the battery, characterized in that, This includes a lithium battery BAT, the positive terminal of which is electrically connected to the normally open contact of a relay KM1, and the normally open contact of the relay KM1 is electrically connected to a DC-DC converter. DC1 + terminal, the DC2+ terminal of the DC-DC converter is electrically connected to the manual switch SB1, the manual switch SB1 is electrically connected to the V+ terminal of the battery management system, the V- terminal of the battery management system is electrically connected to the DC2- terminal of the DC-DC converter, the DC1- terminal of the DC-DC converter is electrically connected to the negative terminal of the lithium battery BAT; the coil of the relay KM1 is electrically connected to the output terminal of the MOSFET of the battery management system; It also includes a charger auxiliary power supply, the Vout+ terminal of which is simultaneously electrically connected to the DC2+ terminal of the DC-DC converter and the manual switch SB1, and the Vout- terminal of which is simultaneously electrically connected to the DC2- terminal of the DC-DC converter and the V- terminal of the battery management system.

2. The power battery system for preventing over-discharge of the battery according to claim 1, characterized in that, The DC2+ terminal of the DC-DC converter is electrically connected to the positive terminal of diode D1, and the negative terminal of diode D1 is electrically connected to the manual switch SB1. The Vout+ terminal of the charger's auxiliary power supply is electrically connected to the positive terminal of diode D2, and the negative terminal of diode D2 is simultaneously electrically connected to the negative terminal of diode D1 and the manual switch SB1.

3. The power battery system for preventing over-discharge of the battery according to claim 1, characterized in that, The model number of the DC-DC converter is DDM-3KDS-01.

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