Battery management system based on industrial and commercial energy storage

Abstract

The utility model discloses a battery management system based on industrial and commercial energy storage. Two ends are respectively connected with the energy storage converter and the battery pack; comprising a shunt (100), a protection module (200), a power supply module (300) and a main control module (400), two ends of the protection module (200) are respectively connected with the energy storage converter and the battery pack; the power supply module (300) is connected with the protection module (200); the main control module (400) is respectively connected with the protection module (200) and the power supply module (300); one end of the shunt (100) is connected with the power supply module (300) and the energy storage converter; the other end of the shunt (100) is connected with the negative electrode of the battery pack; the two ends of the shunt (100) are respectively connected with the protection module (200). The protection module provided by the utility model can protect the battery pack from being impacted by large current during charging and discharging, and has the advantages of high safety and high stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy storage battery, specifically a battery management system based on industrial and commercial energy storage. BACKGROUND

[0002] Industrial and commercial energy storage is an important part of the energy storage industry, and the battery management system of industrial and commercial energy storage is particularly important. For example, the Chinese utility model patent with the authorization announcement number CN218771425U discloses a double-loop control master control box for industrial and commercial energy storage, which comprises: a main circuit and a BMS control circuit electrically connected with the main circuit, the main circuit comprises a protection unit and an on-off unit, and the protection unit is electrically connected with the on-off unit; the on-off unit comprises a normally open contact switch KM1-1, a normally open contact switch KM2-1 and a normally open contact switch KM3-1 controlled by the BMS control circuit, the output end of the normally open contact switch KM1-1 is electrically connected with the input end of the normally open contact switch KM3-1, the output end of the normally open contact switch KM3-1 is electrically connected to the inverter end, the input end of the normally open contact switch KM2-1 is electrically connected to the protection unit, the output end of the normally open contact switch KM2-1 is electrically connected to the inverter end, and the normally open contact switch KM1-1 and the normally open contact switch KM3-1 are electrically connected with a bidirectional rectifier bridge; the application has the effect that manual reset processing is not required when the voltage or temperature decreases. However, industrial and commercial energy storage has the characteristics of high voltage and large capacity, and the battery pack connected with the energy storage converter will generate a large current during charging and discharging, which will cause impact on the battery pack. SUMMARY

[0003] The utility model discloses a battery management system based on industrial and commercial energy storage, which can protect the battery pack from being impacted by a large current during charging and discharging, and has the advantages of high safety and high stability.

[0004] The utility model discloses a battery management system based on industrial and commercial energy storage, which can protect the battery pack from being impacted by a large current during charging and discharging, and has the advantages of high safety and high stability.

[0005] The battery management system based on industrial and commercial energy storage comprises a protection module, a power module and a main control module. The protection module comprises a pre-charging resistor R1, a pre-charging relay KM2, a discharging relay KM1, a charging relay KM3, a diode D1, a diode D2 and a fuse FU1. One end of the pre-charging resistor R1 is connected to the positive electrode of the diode D1, one end of the discharging relay KM1 switch, the power module and the main control module. The negative electrode of the diode D1 is connected to the negative electrode of the diode D2, the other end of the discharging relay KM1 switch and one end of the charging relay KM3 switch. The other end of the pre-charging resistor R1 is connected to one end of the pre-charging relay KM2 switch. The other end of the pre-charging relay KM2 switch is connected to the positive electrode of the diode D2, the other end of the charging relay KM3 switch and one end of the fuse FU1, and is connected to the power module and the main control module. The other end of the fuse FU1 is connected to the positive electrode of the battery pack. The two ends of the pre-charging relay KM2 coil are respectively connected to the main control module. The two ends of the discharging relay KM1 coil are respectively connected to the main control module. The two ends of the charging relay KM2 coil are respectively connected to the main control module.

[0006] The battery management system based on industrial and commercial energy storage comprises a protection module, a power module and a main control module. The protection module comprises a pre-charging resistor R1, a pre-charging relay KM2, a discharging relay KM1, a charging relay KM3, a diode D1, a diode D2 and a fuse FU1. One end of the pre-charging resistor R1 is connected to the positive electrode of the diode D1, one end of the discharging relay KM1 switch, the power module and the main control module. The negative electrode of the diode D1 is connected to the negative electrode of the diode D2, the other end of the discharging relay KM1 switch and one end of the charging relay KM3 switch. The other end of the pre-charging resistor R1 is connected to one end of the pre-charging relay KM2 switch. The other end of the pre-charging relay KM2 switch is connected to the positive electrode of the diode D2, the other end of the charging relay KM3 switch and one end of the fuse FU1, and is connected to the power module and the main control module. The other end of the fuse FU1 is connected to the positive electrode of the battery pack. The two ends of the pre-charging relay KM2 coil are respectively connected to the main control module. The two ends of the discharging relay KM1 coil are respectively connected to the main control module. The two ends of the charging relay KM2 coil are respectively connected to the main control module.

[0007] The battery management system based on commercial and industrial energy storage as described above further comprises a shunt breaker QF1; the shunt breaker QF1 comprises a first switch and a second switch; one end of the first switch of the shunt breaker QF1 is connected to the positive pole of the energy storage converter; the other end of the first switch of the shunt breaker QF1 is connected to the protection module and the power supply module; one end of the second switch of the shunt breaker QF1 is connected to the negative pole of the energy storage converter; the other end of the second switch of the shunt breaker QF1 is connected to the power supply module, the shunt and the main control module.

[0008] The battery management system based on commercial and industrial energy storage as described above, one end of the coil of the shunt breaker QF1 is connected to one end of the emergency stop button SB2-1, the other end of the emergency stop button SB2-1 is connected to one end of the jog button SB1-2, the other end of the jog button SB1-2 is connected to the main control module; the other end of the coil of the shunt breaker QF1 is connected to the power supply module.

[0009] The battery management system based on commercial and industrial energy storage as described above, the main control module is further connected with a BMU communication module.

[0010] The battery management system based on commercial and industrial energy storage as described above, a LAN panel is arranged on the side of the main control module, and the LAN panel is provided with a LAN1 interface and a LAN2 interface.

[0011] Compared with the prior art, the protection module of the utility model protects the battery pack during charging and discharging, and avoids damage of the battery pack due to abnormal state during charging and discharging; the power supply module is used for supplying power to the utility model; the shunt is used for detecting the current during charging and discharging of the battery pack; the main control module is used for acquiring state information during charging and discharging of the battery pack, and controlling the protection action of the protection module according to the state information; the protection module of the utility model can protect the battery pack from being impacted by a large current during charging and discharging, and has the advantages of high safety and high stability. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is the circuit diagram of the utility model;

[0013] Figure 2 is the circuit diagram of the shunt, the protection module and the power supply module;

[0014] Figure 3 is the circuit diagram of the main control module.

[0015] The marks in the drawings are: 100-shunt, 200-protection module, 300-power supply module, 400-main control module. DETAILED DESCRIPTION

[0016] The utility model will be further described below in combination with the drawings and examples, but not as the basis for limiting the utility model.

[0017] Embodiment: battery management system based on industrial and commercial energy storage, such as Figure 1 As shown, two ends are connected with energy storage converter and battery pack respectively; including shunt 100, protection module 200, power module 300 and main control module 400; the two ends of protection module 200 are connected with energy storage converter and battery pack respectively; the power module 300 is connected with protection module 200; the main control module 400 is connected with protection module 200 and power module 300 respectively; one end of shunt 100 is connected with power module 300 and energy storage converter; the other end of shunt 100 is connected with negative electrode of battery pack; the two ends of shunt 100 are connected with protection module 200 respectively. The protection module 200 of the utility model is used for protecting battery pack when charging and discharging, to avoid damaging battery pack due to abnormal state when charging and discharging; the power module 300 is used for supplying power to the utility model; the shunt 100 is used for detecting current when battery pack is charging and discharging; the main control module 400 is used for obtaining state information when battery pack is charging and discharging, and controlling protection action of protection module 200 according to state information; the protection module of the utility model can protect battery pack from being impacted by large current when charging and discharging, and has the advantages of high safety and high stability.

[0018] The protection module 200 is as shown in Figure 2 The protection module 200 includes pre-charging resistor R1, pre-charging relay KM2, discharging relay KM1, charging relay KM3, diode D1, diode D2 and fuse FU1; one end of pre-charging resistor R1 is connected with positive electrode of diode D1, one end of discharging relay KM1 switch, power module 300 and main control module 400; negative electrode of diode D1 is connected with negative electrode of diode D2, the other end of discharging relay KM1 switch and one end of charging relay KM3 switch; the other end of pre-charging resistor R1 is connected with one end of pre-charging relay KM2 switch; the other end of pre-charging relay KM2 switch is connected with positive electrode of diode D2, the other end of charging relay KM3 switch and one end of fuse FU1, and is connected with power module 300 and main control module 400; the other end of fuse FU1 is connected with positive electrode of battery pack; the two ends of pre-charging relay KM2 coil are connected with main control module 400 respectively; the two ends of discharging relay KM1 coil are connected with main control module 400 respectively; the two ends of charging relay KM2 coil are connected with main control module 400 respectively. Pre-charging resistor R1 and pre-charging relay KM2 are connected in series to form pre-charging circuit, which plays a role of current limiting under the condition that the pressure difference between energy storage converter and battery pack is too large. Diode D1 and diode D2 form common negative diode, and together with discharging relay KM1 and charging relay KM3 form charging and discharging separation circuit of battery pack, which plays a role of charging and discharging separation of battery pack. Fuse FU1 is used for overcurrent safety protection.

[0019] Power module 300 Figure 2 As shown, the power supply module 300 includes diodes D3, D4, D5, and D6, a jog button SB1-1, relays KA1 and KA3, a switching power supply PV350, and a switching power supply PTM-350. The positive terminal of diode D3 is connected to the protection module 200; the negative terminal of diode D3 is connected to the negative terminal of diode D4 and the positive input terminal of the switching power supply PV350; the positive terminal of diode D4 is connected to one end of the jog button SB1-1 and one end of the relay KA1; the other end of the jog button SB1-1 is connected to the other end of the relay KA1, the protection module 200, and the main control module 400; the negative input terminal of the switching power supply PV350 is connected to the protection module 200. The system includes a protection module 200 and a power supply module 300. The positive output terminal of the switching power supply PC350 is connected to the positive terminal of diode D5; the negative terminal of diode D5 is connected to the negative terminal of diode D6 and the main control module 400; the positive terminal of diode D6 is connected to the positive output terminal of the switching power supply PTM-350 and one end of the relay KA3 switch; the negative output terminal of the switching power supply PC350 is connected to the other end of the relay KA3 switch, the negative output terminal of the switching power supply PTM-350, and the main control module 400; the input terminal of the switching power supply PTM-50 is connected to a 220V voltage source; the two ends of the relay KA1 coil are connected to the main control module 400; the two ends of the relay KA3 coil are connected to the main control module 400. The switching power supply PV350 converts the high voltage from the battery pack or energy storage converter into 24V DC voltage, providing power to the main control module 400, other control devices, and external interfaces. Relay KA1 and jog button SB1-1 form a self-locking circuit. The PTM-350 switching power supply converts 220V AC voltage to 24V DC voltage, thus providing the working voltage for this invention from an external power source.

[0020] When the power module 300 is in use, the jog buttons SB1-1 and SB1-2 are a double button that operates simultaneously. During startup, this button needs to be pressed and held. When jog button SB1-1 is pressed, the switching power supply PV350 is powered on and outputs 24V DC voltage to supply power to the main control module 400. After the main control module 400 is powered on, it starts working. Once the main control module 400 is working, it outputs a signal at DO4- of terminal C to activate the relay KA1. The relay KA1 and jog button SB1-1 form a self-locking circuit. At this point, releasing the jog button allows the switching power supply PV350 to continue providing 24V DC power to the main control module, completing the power supply startup.

[0021] When shutting down, you also need to press and hold the jog button SB1-1. At this time, the jog button SB1-2 changes from normally open to normally closed. The C group terminal 21 (DI5) of the main control module 400 detects the low level shutdown signal. After saving all data, it disconnects the DO4- output signal of the C group terminal, cuts off the input voltage of the switching power supply PV350, thereby disconnecting the 24V DC power supply and completing the shutdown task.

[0022] Main control module 400 Figure 3 As shown, the main control module 400 is also connected to a BMU communication module, which allows communication with other slave control modules. The main control module 400 has a LAN panel on its side, with LAN1 and LAN2 interfaces for connecting to a local area network. The main control module 400 is connected to a shunt converter to detect the charging and discharging current of the protection module 200. The main control module 400 is connected to the coils of charging relay KM3 and discharging relay KM1 to control their switching. Furthermore, the main control module 400 is also used to detect and record the battery pack voltage and energy storage converter voltage as historical data, detect copper busbar temperature, and communicate with slave control modules. The main control module 400 controls the power supply to the slave control modules by controlling relay KA2, communicates with the slave control modules via a CAN bus, and also has RS485 communication capabilities.

[0023] The battery management system also includes a shunt circuit breaker QF1; the shunt circuit breaker QF1 includes a first switch and a second switch; one end of the first switch of the shunt circuit breaker QF1 is connected to the positive terminal of the energy storage converter; the other end of the first switch of the shunt circuit breaker QF1 is connected to the protection module 200 and the power module 300; one end of the second switch of the shunt circuit breaker QF1 is connected to the negative terminal of the energy storage converter; the other end of the second switch of the shunt circuit breaker QF1 is connected to the power module 300, the shunt 100, and the main control module 400. One end of the coil of the shunt circuit breaker QF1 is connected to one end of the emergency stop button SB2-1, the other end of the emergency stop button SB2-1 is connected to one end of the jog button SB1-2, the other end of the jog button SB1-2 is connected to the main control module 400; the other end of the coil of the shunt circuit breaker QF1 is connected to the power module 300.

[0024] The charging process of the battery pack: the master control module 400 judges that all are normal by detecting the group terminal voltage, copper bar temperature and the data uploaded from the slave control module. When the master control module 400 receives the charging signal, it will first calculate the voltage difference between the collected energy storage converter voltage and the battery pack voltage. If the voltage difference is greater than the specified value, the 4(DO2-) interface of the master control module C group terminal is connected, the switch of the pre-charging relay KM2 is closed, causing the pre-charging resistor R1 connected in series between the battery pack and the energy storage converter to be connected. Due to the current limiting effect of the pre-charging resistor R1, the current intensity flowing from the energy storage converter to the battery pack is weakened, avoiding the impact of large current on the battery pack, thereby protecting the battery pack. When the voltage difference between the energy storage converter and the battery pack is less than the specified value, the master control module 400 disconnects the control of the pre-charging relay KM2 and starts the normal charging mode.

[0025] If the voltage difference between the energy storage converter and the battery pack is less than the specified value after the master control module 400 receives the charging signal, the normal charging mode is started. First, the 6(DO3-) interface of the C group terminal of the master control module 400 is connected, the charging relay KM3 is powered on, the main contact of the switch of the charging relay KM3 is closed, the energy storage converter current flows into the positive electrode of the shunt breaker QF1, and then flows through the diode D1, the main contact of the switch of the charging relay KM3, the fuse FU1 to the positive electrode of the battery pack. The negative electrode of the battery pack passes through the shunt and the negative electrode of the shunt breaker QF1 to reach the energy storage converter. At the same time that the main contact of the switch of the charging relay KM3 is closed, the auxiliary contact of the switch of the charging relay KM3 is also closed, causing the 19(DI3L) of the C group terminal of the master control module 400 to be connected to ground, and the 19th terminal is the feedback pin of the control terminal of the master control module 400. The master control module 400 detects that the charging relay KM3 is successfully closed through the 19th terminal, and simultaneously monitors the shunt current and records it. If the master control module 400 does not detect a low-level signal from the 19th terminal(DI3L) in this step, the master control module 400 will consider that the charging relay KM3 just failed to close, and will determine that there is a fault, and will output a signal to disconnect the shunt breaker QF1, disconnecting the voltage between the energy storage converter and the battery pack to ensure safety.

[0026] The B group terminal CS1+ and CS1- of the master control module are current collection interfaces that continuously detect the current flowing through the shunt to ensure that the charging current meets the set value. If it is too large and exceeds the alarm value, it will disconnect the relay and open the air switch.

[0027] Discharge process of the battery pack: the first step is same as the charging process, the main control module 400 judges that all are normal through detecting group terminal voltage, copper row temperature and data uploaded from the controlled module, when the main control module 400 receives the charging signal, the first step is to calculate the voltage difference between the energy storage converter and the battery pack, if the voltage difference is greater than the specified value, the 4 (DO2-) interface of the C group terminal of the main control module 400 is connected, the pre-charging relay KM2 is closed, and the pre-charging resistor R1 between the battery pack and the energy storage converter is connected, because of the current limiting effect of the pre-charging resistor R1, the current intensity of the battery pack flowing to the energy storage converter is weakened, so as to avoid the impact of large current on the battery pack, thereby protecting the battery pack, when the voltage difference between the energy storage converter and the battery pack is less than the specified value, the main control module 400 disconnects the control of the pre-charging relay KM2, and then starts the normal discharge mode.

[0028] The 2 (DO1-) inside the C group terminal of the main control module 400 is connected to output the control signal, so that the discharge relay KM1 is attracted, because the charging relay KM3 is disconnected at this time, under the influence of the diode D1 and the diode D2, the current reaches the positive pole position of the energy storage converter from the positive pole of the battery pack via the fuse FU1, the diode D2, the switch main contact of the discharge relay KM1, the shunt field breaker QF1.In the negative pole position of the energy storage converter, the current of the energy storage converter reaches the negative pole of the battery pack from the shunt field breaker QF1, the copper row and the shunt, and the discharge loop is completed.

[0029] The discharge loop and the charging loop are same, the B group terminal CS1+ and CS1- of the main control module 400 detect the current flowing through the shunt, ensure that the charging current meets the set value, if it is too large and exceeds the alarm value, the relay is disconnected and the air switch is disconnected, etc.The protection module 200 of the utility model can also realize double-loop control of the battery pack charging and discharging through the cooperation of the charging relay KM3 and the diode D1, the cooperation of the discharge relay KM1 and the diode D2, so as to achieve the effect that manual reset is not needed after the fault is removed.

[0030] Working principle: the protection module 200 of the utility model is used for protecting the battery pack when the battery pack is charging and discharging, and avoiding damage of the battery pack due to abnormal state when charging and discharging; the power module 300 is used for supplying power to the utility model; the shunt 100 is used for detecting the current when the battery pack is charging and discharging; the main control module 400 is used for acquiring state information when the battery pack is charging and discharging, and controlling the protection action of the protection module 200 according to the state information; the protection module of the utility model can protect the battery pack from being impacted by large current when charging and discharging, and has the advantages of high safety and high stability.

[0031] The above embodiment only expresses the implementation mode of the utility model, and the description is relatively specific and detailed, but cannot be understood as the limitation of the utility model patent range, and in the embodiment, up, down, left, right, front and back only represent relative positions and do not represent absolute positions. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A battery management system based on commercial and industrial energy storage, connecting energy storage converter and battery pack at both ends; characterized in that: It includes shunt (100), protection module (200), power module (300) and master module (400); both ends of the protection module (200) are connected with energy storage converter and battery pack respectively; the power module (300) is connected with the protection module (200); the master module (400) is connected with the protection module (200) and the power module (300) respectively; one end of the shunt (100) is connected with the power module (300) and the energy storage converter; the other end of the shunt (100) is connected with the negative electrode of the battery pack; both ends of the shunt (100) are connected with the protection module (200) respectively.

2. The commercial and industrial energy-based battery management system of claim 1, wherein: The protection module (200) includes pre-charge resistor R1, pre-charge relay KM2, discharge relay KM1, charging relay KM3, diode D1, diode D2 and fuse FU1; one end of the pre-charge resistor R1 is connected with the positive electrode of the diode D1, one end of the discharge relay KM1 switch, the power module (300) and the master module (400); the negative electrode of the diode D1 is connected with the negative electrode of the diode D2, the other end of the discharge relay KM1 switch and one end of the charging relay KM3 switch; the other end of the pre-charge resistor R1 is connected with one end of the pre-charge relay KM2 switch; the other end of the pre-charge relay KM2 switch is connected with the positive electrode of the diode D2, the other end of the charging relay KM3 switch and one end of the fuse FU1, and is connected with the power module (300) and the master module (400); the other end of the fuse FU1 is connected with the positive electrode of the battery pack; both ends of the pre-charge relay KM2 coil are connected with the master module (400) respectively; both ends of the discharge relay KM1 coil are connected with the master module (400) respectively; both ends of the charging relay KM2 coil are connected with the master module (400) respectively.

3. The commercial and industrial energy-based battery management system of claim 2, wherein: The power module (300) comprises a diode D3, a diode D4, a diode D5, a diode D6, a jog button SB1-1, a relay KA1, a relay KA3, a switching power supply PV350 and a switching power supply PTM-350; the positive pole of the diode D3 is connected with the protection module (200); the negative pole of the diode D3 is connected with the negative pole of the diode D4 and the input positive pole of the switching power supply PV350; the positive pole of the diode D4 is connected with one end of the jog button SB1-1 and one end of the relay KA1 switch; the other end of the jog button SB1-1 is connected with the other end of the relay KA1 switch, the protection module (200) and the main control module (400); the input negative pole of the switching power supply PV350 is connected with the protection module (200) and the power module (300); the output positive pole of the switching power supply PC350 is connected with the positive pole of the diode D5; the negative pole of the diode D5 is connected with the negative pole of the diode D6 and the main control module (400); the positive pole of the diode D6 is connected with the output positive pole of the switching power supply PTM-350 and one end of the relay KA3 switch; the output negative pole of the switching power supply PC350 is connected with the other end of the relay KA3 switch, the output negative pole of the switching power supply PTM-350 and the main control module (400); the input of the switching power supply PTM-50 is connected with a 220V voltage source; the two ends of the relay KA1 coil are connected with the main control module (400); the two ends of the relay KA3 coil are connected with the main control module (400).

4. The commercial and industrial energy-based battery management system of claim 3, wherein: Further comprising a field-break circuit breaker QF1; the field-break circuit breaker QF1 comprises a first switch and a second switch; one end of the first switch of the field-break circuit breaker QF1 is connected with the positive pole of the energy storage converter; the other end of the first switch of the field-break circuit breaker QF1 is connected with the protection module (200) and the power module (300); one end of the second switch of the field-break circuit breaker QF1 is connected with the negative pole of the energy storage converter; the other end of the second switch of the field-break circuit breaker QF1 is connected with the power module (300), the shunt (100) and the main control module (400).

5. The commercial and industrial energy-based battery management system of claim 4, wherein: One end of the coil of the field-break circuit breaker QF1 is connected with one end of the emergency stop button SB2-1, the other end of the emergency stop button SB2-1 is connected with one end of the jog button SB1-2, the other end of the jog button SB1-2 is connected with the main control module (400); the other end of the coil of the field-break circuit breaker QF1 is connected with the power module (300).

6. The commercial and industrial energy-based battery management system of claim 1, wherein: The main control module (400) is further connected with a BMU communication module.

7. The commercial and industrial energy-based battery management system of claim 1, wherein: The side of the main control module (400) is provided with a LAN panel, and the LAN panel is provided with a LAN1 interface and a LAN2 interface.

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