Energy storage system high voltage control circuitry

Abstract

The utility model discloses a kind of energy storage system high voltage control circuit system, including BMS control system module, battery cluster, DC / AC energy storage converter, fusion switch module;Fusion switch module includes main switch group and preset switch group, main switch group is installed in battery cluster anode circuit, and is linked control by BMS control system module;Preset switch group is shunt in battery cluster anode circuit, and is linked control by BMS control system module.Fusion switch module is a module integrated circuit breaker and relay, inside is the on-off of motor operating switch, because using motor, so if sticking, motor then forcibly separates switch group, solves the problem that sticking cannot control.And fusion switch module integration is high, can replace circuit breaker, pre-charge relay and main circuit relay three devices, internal structure is simple, reduce system failure rate, external space occupation is small, improve space utilization.

Description

Technical Field

[0001] This utility model belongs to the technical field of energy storage system circuits, and in particular relates to a high-voltage control circuit system for energy storage systems. Background Technology

[0002] Energy storage cabinets mainly consist of the following components: battery packs, battery management system, energy management system, and inverters. Energy storage cabinets are widely used in the following scenarios: Wind and solar power generation with integrated energy storage: improving the utilization efficiency of renewable energy generation by smoothing its output. Grid peak shaving and demand response: releasing electricity during peak grid load periods to alleviate grid load pressure; absorbing excess electricity during off-peak periods to achieve peak shaving and valley filling. Microgrids and distributed energy systems: improving the stability and economy of microgrids and distributed energy systems through peak shaving, valley filling, and load balancing functions. Electric vehicle charging infrastructure: mitigating the impact of charging piles on the grid, improving the utilization efficiency of charging piles, and providing backup power for electric vehicles.

[0003] In the new energy sector, circuit breakers are commonly used in series with relays for controlling the power supply and shutdown of high-voltage direct current. However, in practice, relays often experience sticking. Circuit breakers, on the other hand, typically only provide passive overload and short-circuit protection and cannot perform active control. Consequently, high-voltage control systems suffer from high failure rates and often become uncontrollable. Utility Model Content

[0004] The purpose of this invention is to provide a high-voltage control circuit system for an energy storage system, which is a new high-voltage control combination for energy storage systems and a new power-on / off control method, thereby improving system stability.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] A high-voltage control circuit system for an energy storage system includes a BMS control system module, a battery cluster, a DC / AC energy storage converter, and a fusion switch module. The BMS is a system for monitoring and managing the battery. By collecting and calculating parameters such as voltage, current, temperature, and SOC, it controls the charging and discharging process of the battery, thereby protecting the battery and improving its overall performance.

[0007] The positive and negative terminals of the battery cluster are connected to the DC / AC energy storage converter through a fusion switch module.

[0008] The fusion switch module includes a main switch group and a preset switch group. The main switch group is installed on the positive and negative electrode circuits of the battery cluster and is controlled in conjunction with the BMS control system module. The preset switch group is connected in parallel to the positive and negative electrode circuits of the battery cluster and is also controlled in conjunction with the BMS control system module.

[0009] Both the main switch group and the preset switch group are integrated into the BMS control system module. The BMS control system module collects parameters such as voltage, current, and temperature, and then inputs signals to perform the opening / closing operation of the switch group.

[0010] Furthermore, the positive terminal of the battery cluster is connected to the DC / AC energy storage converter through a first circuit, and the negative terminal is connected to the DC / AC energy storage converter through a second circuit. The main switch group includes a first switch connected in series with the first circuit and a second switch connected in series with the second circuit.

[0011] The preset switch group includes a third switch and a fourth switch. The third switch is connected in parallel to both sides of the first switch via a third circuit, and the fourth switch is connected in parallel to both sides of the second switch via a fourth circuit. A pre-charge resistor is connected in series in the third circuit. The pre-charge resistor acts as a protection device for high-voltage power-on, reducing the voltage difference and the risk of arcing, thus protecting the main switch group and ensuring a smooth system startup.

[0012] A fuse is connected in series in the first circuit corresponding to the battery cluster, and the fuse is located before the connection between the first and third circuits. The fuse can blow in the event of a short circuit or overload in the main circuit, protecting all high-voltage equipment and making the system more stable.

[0013] A shunt is connected in series in the second circuit corresponding to the battery cluster. The shunt is located before the connection between the second and fourth circuits. As a current-collecting component in the circuit, the shunt helps the BMS read current data and determine the current direction.

[0014] This invention offers the following advantages: The integrated switch module combines a circuit breaker and a relay, internally controlling the opening and closing of the motor-operated switch. Because it uses a motor, if the circuit breaker becomes stuck, the motor will forcibly separate the switch assembly, solving the problem of uncontrollable sticking. Furthermore, the integrated switch module has a high degree of integration, replacing the circuit breaker, pre-charge relay, and main circuit relay. Its simple internal structure reduces the system failure rate, and its small external footprint improves space utilization.

[0015] The integrated switch module has two sets of input points, which control the precharge switch group and the main circuit switch group respectively. The BMS control system module realizes the up and down point flow of the system by sending closing and opening commands to these two inputs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 Circuit diagram of this utility model.

[0018] Figure 2: Flowchart of the high-voltage power-on process of this utility model system.

[0019] Figure 3 : Flowchart of the high-voltage power supply process of this utility model system.

[0020] The components represented by each number in the attached diagram are listed below: Battery cluster 1, DC / AC energy storage converter 2, integrated switch module 3, first circuit 11, second circuit 12, first switch 31, second switch 32, third switch 33, fourth switch 34, third circuit 13, fourth circuit 14, pre-charge resistor 4, fuse 5, shunt 6. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] like Figure 1 As shown: A high-voltage control circuit system for an energy storage system includes a BMS control system module, a battery cluster 1, a DC / AC energy storage converter 2, and a fusion switch module 3;

[0023] The positive and negative terminals of battery cluster 1 are connected to DC / AC energy storage converter 2 via integrated switch module 3;

[0024] The integrated switch module 3 includes a main switch group and a preset switch group. The main switch group is installed on the positive and negative circuits of the battery cluster 1 and is controlled in conjunction with the BMS control system module. The preset switch group is connected in parallel to the positive and negative circuits of the battery cluster and is also controlled in conjunction with the BMS control system module.

[0025] The positive terminal of battery cluster 1 is connected to DC / AC energy storage converter 2 through the first circuit 11, and the negative terminal is connected to DC / AC energy storage converter 2 through the second circuit 12. The main switch group includes a first switch 31 connected in series with the first circuit 11 and a second switch 32 connected in series with the second circuit 12.

[0026] The preset switch group includes a third switch 33 and a fourth switch 34. The third switch 33 is connected in parallel to both sides of the first switch 31 through the third circuit 13, and the fourth switch 34 is connected in parallel to both sides of the second switch 32 through the fourth circuit 14. The third circuit 13 is connected in series with a pre-charge resistor 4.

[0027] A fuse 5 is connected in series with the first circuit 11 corresponding to the battery cluster 1. The fuse 5 is located before the connection between the first circuit 11 and the third circuit 13.

[0028] The second circuit 12 corresponding to battery cluster 1 is connected in series with shunt 6, which is located before the connection between the second circuit 12 and the fourth circuit 14.

[0029] like Figure 2 The high-voltage power-on process is as follows: First, the BMS system performs a self-test. If a self-test fault occurs, it reports the fault. If no fault occurs, it sends a pre-charge closing command to the fusion switch, and the fusion switch motor controls the pre-charge switch group to close immediately. If the pre-charge conditions cannot be met, pre-charge is considered a failure, and a fault is reported. If the pre-charge completion conditions are met, pre-charge is successful. The BMS system sends a command to close the main switch to the fusion switch, and the fusion switch motor controls the main switch group to close immediately. After waiting for 1 second, the BMS sends a pre-charge disconnect command to the fusion switch, and the fusion switch motor disconnects the pre-charge switch group. Then, the BMS requests power from the converter, and the high-voltage power-on is complete.

[0030] like Figure 3 As shown: System high-voltage power-off process: The BMS system sends a charge-discharge prohibition command to the converter, requesting all power to be 0. If the main circuit current of the high-voltage system is greater than 5A, it continues to wait until the main circuit current is less than 5A. The BMS sends a disconnect main switch command to the fusion switch. The internal motor of the fusion switch disconnects the main switch group, and the power-off is completed.

[0031] These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of this utility model, so that those skilled in the art can better understand and utilize this utility model.

Claims

1. A high-voltage control circuit system for an energy storage system, characterized in that: Includes BMS control system module, battery cluster (1), DC / AC energy storage converter (2), and integrated switch module (3); The positive and negative terminals of the battery cluster (1) are connected to the DC / AC energy storage converter (2) through the fusion switch module (3); The fusion switch module (3) includes a main switch group and a preset switch group. The main switch group is installed on the positive and negative electrode circuits of the battery cluster (1) and is controlled by the BMS control system module. The preset switch group is connected in parallel to the positive and negative electrode circuits of the battery cluster and is controlled by the BMS control system module.

2. The high-voltage control circuit system for an energy storage system according to claim 1, characterized in that: The positive terminal of the battery cluster (1) is connected to the DC / AC energy storage converter (2) through the first circuit (11), and the negative terminal is connected to the DC / AC energy storage converter (2) through the second circuit (12). The main switch group includes a first switch (31) connected in series with the first circuit (11) and a second switch (32) connected in series with the second circuit (12).

3. The high-voltage control circuit system for an energy storage system according to claim 2, characterized in that: The preset switch group includes a third switch (33) and a fourth switch (34). The third switch (33) is connected in parallel to both sides of the first switch (31) through a third circuit (13), and the fourth switch (34) is connected in parallel to both sides of the second switch (32) through a fourth circuit (14). The third circuit (13) is connected in series with a pre-charge resistor (4).

4. The high-voltage control circuit system for an energy storage system according to claim 3, characterized in that: A fuse (5) is connected in series with the first circuit (11) corresponding to the battery cluster (1). The fuse (5) is located before the connection between the first circuit (11) and the third circuit (13).

5. The high-voltage control circuit system for an energy storage system according to claim 3, characterized in that: A shunt (6) is connected in series with the second circuit (12) corresponding to the battery cluster (1). The shunt (6) is located before the connection between the second circuit (12) and the fourth circuit (14).

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