Household storage battery system with BMS protection function

Abstract

A home storage battery system with a BMS protection function comprises a battery pack, an inverter, a BMS, a first connecting circuit, a second connecting circuit and a starting circuit, the first connecting circuit is connected with the negative electrode of the battery pack and the negative electrode access end of the inverter, and the second connecting circuit is connected with the positive electrode of the battery pack and the positive electrode access end of the inverter. The BMS is connected to the first connecting circuit in parallel, the starting circuit is connected to the first connecting circuit, the second connecting circuit and the BMS at the same time, the starting circuit comprises a timer and a switch, and the timer comprises a power input end, a power output end, a first signal access end and a second signal access end. The power input end of the timer is connected to the second connecting circuit, the power output end of the timer is connected to a circuit between the first connecting circuit and the inverter, and the BMS, the first signal access end, the second signal access end and the switch form a series loop. The service life of the product is effectively prolonged, and the practicability is high.

Description

Technical Field

[0001] This utility model relates to a control circuit, and more particularly to a home battery storage system with BMS protection function. Background Technology

[0002] Batteries store direct current (DC), while household appliances typically use alternating current (AC). Therefore, in the current home energy storage market, batteries all need to be used with inverters. Inverters convert DC to AC to ensure that appliances work properly. At the same time, inverters can adjust the voltage to ensure the safe operation of the equipment.

[0003] Inverters have a large capacitor of 3W uF to 10W uF at the battery input terminal. During startup, the capacitor needs to charge rapidly, resulting in a large current (inrush current) generated in a short period of time. If the inrush current is too large, it may exceed the rated current of the capacitor, causing internal heating or dielectric breakdown. Without sufficient protection, it is easy for a momentary short circuit to cause damage to the battery management system (BMS).

[0004] The commonly used method on the market is to use software control. In the initial stage of battery connection to inverter, bypass charging is used to charge the capacitor voltage to a certain level before switching to the main circuit. This solution is costly and the BMS is relatively complex. Utility Model Content

[0005] Therefore, it is necessary to provide a home battery storage system with BMS protection function to address the shortcomings of existing technologies.

[0006] A home battery storage system with BMS protection includes a battery pack, an inverter, and a BMS. The inverter has a capacitor C1 connected in parallel to both the negative and positive terminals of the inverter. The system also includes a first connection circuit, a second connection circuit, and a startup circuit. The first connection circuit connects the negative terminal of the battery pack to the negative terminal of the inverter. The second connection circuit connects the positive terminal of the battery pack to the positive terminal of the inverter. The BMS is connected in parallel to the first connection circuit. The startup circuit is connected to the first connection circuit, the second connection circuit, and the BMS. The startup circuit includes a timer and a switch. The timer includes a power input terminal, a power output terminal, a first signal input terminal, and a second signal input terminal. The power input terminal of the timer is connected to the second connection circuit, and the power output terminal of the timer is connected to the circuit between the first connection circuit and the inverter. The BMS, the first signal input terminal, the second signal input terminal, and the switch form a series circuit.

[0007] In one embodiment, the first connection circuit includes a resistor R1 and a circuit breaker, wherein the negative terminal of the battery pack, the resistor R1, the circuit breaker, and the negative terminal of the inverter are connected in series.

[0008] In one embodiment, the power output of the timer is connected to the circuit between the circuit breaker and the inverter.

[0009] In one embodiment, the BMS includes a first acquisition terminal and a second acquisition terminal, which are connected in parallel to a resistor R1 and a circuit breaker.

[0010] In one embodiment, the BMS further includes a first detection terminal and a second detection terminal, wherein the first detection terminal, the first signal access terminal, the second signal access terminal, the switch, and the second detection terminal form a series circuit.

[0011] The beneficial effects of this utility model of a home battery storage system with BMS protection function are as follows: By further setting up a start-up circuit on the basis of battery pack, inverter, first connection circuit, second connection circuit, and BMS, the start-up circuit is equipped with a timer and a switch. At the moment the circuit breaker is opened, the inverter capacitor is charged first, and the timer starts at the same time. During the timer's counting period, the BMS does not start, thereby effectively protecting the BMS and preventing it from being damaged at the moment the circuit starts. This effectively improves the product's service life, saves on operating costs, and is highly practical. Attached Figure Description

[0012] Figure 1 This is a connection diagram of the home battery storage system with BMS protection function according to this utility model. Detailed Implementation

[0013] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0014] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0018] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0019] Please see Figure 1 This utility model provides a home battery storage system with BMS protection function, including a battery pack 10, an inverter 20, a first connection circuit 30, a second connection circuit 40, a BMS 50, and a start-up circuit 60. The first connection circuit 30 is connected to the negative terminal of the battery pack 10 and the negative terminal of the inverter 20. The second connection circuit 40 is connected to the positive terminal of the battery pack 10 and the positive terminal of the inverter 20. The BMS 50 is connected in parallel to the first connection circuit 30. The start-up circuit 60 is connected to the first connection circuit 30, the second connection circuit 40, and the BMS 50. The BMS 50 collects voltage information between the circuit breaker 31 and the resistor R1 through the first acquisition terminal 51 and the second acquisition terminal 52.

[0020] The inverter 20 is equipped with a capacitor C1, which is connected in parallel to the negative terminal and the positive terminal of the inverter 20. The first connection circuit 30 includes a resistor R1 and a circuit breaker 31, wherein the negative terminal of the battery pack 10, the resistor R1, the circuit breaker 31, and the negative terminal of the inverter 20 are connected in series. The BMS 50 includes a first acquisition terminal 51, a second acquisition terminal 52, a first detection terminal 53, and a second detection terminal 54. The first acquisition terminal 51 and the second acquisition terminal 52 are connected in parallel to the resistor R1 and the circuit breaker 31.

[0021] The starting circuit 60 includes a timer 70 and a switch 80. The timer 70 includes a power input terminal 71, a power output terminal 72, a first signal input terminal 73, and a second signal input terminal 74. The power input terminal 71 of the timer 70 is connected to the second connection circuit 40, and the power output terminal 72 of the timer 70 is connected to the circuit between the circuit breaker 31 and the inverter 20. The power input terminal 71 of the timer 70 is connected to the second connection circuit 40. The first detection terminal 53, the first signal input terminal 73, the second signal input terminal 74, the switch 80, and the second detection terminal 54 form a series circuit. After the power input terminal 71 and the power output terminal 72 are connected to power, the timer 70 starts. After the timer 70 reaches its timing time, the circuit between the first signal input terminal 73 and the second signal input terminal 74 is connected; otherwise, the circuit between the first signal input terminal 73 and the second signal input terminal 74 is disconnected.

[0022] When the battery pack 10 needs to supply power to the electrical equipment, the user opens the circuit breaker 31, putting the circuit breaker 31 in the circuit-on state. At this time, the circuit between the negative terminal of the battery pack 10 and the negative terminal of the inverter 20 is connected, and the battery charges the capacitor C1 on the inverter 20. At the same time, after the power input terminal 71 and the power output terminal 72 are connected to the power supply, the timer 70 starts. During the timing period of the timer 70, the circuit between the first signal input terminal 73 and the second signal input terminal 74 is in the open state, and the start switch 80 is ineffective until the timing ends (in this embodiment, the timing time of the timer 70 is set to 2 seconds). At this time, the circuit between the first signal input terminal 73 and the second signal input terminal 74 of the timer 70 is in the open state. When the switch 80 is pressed, the first detection terminal 53, the first signal input terminal 73, the second signal input terminal 74, the switch 80, and the second detection terminal 54 form a series circuit with the circuit connected. When the BMS 50 detects that the first detection terminal 53 and the second detection terminal 54 are connected, the BMS 50 is started.

[0023] The beneficial effects of this utility model of a home battery storage system with BMS protection function are as follows: By further setting up a start-up circuit 60 on the basis of battery pack 10, inverter 20, first connection circuit 30, second connection circuit 40, and BMS 50, the start-up circuit 60 is equipped with a timer 70 and a switch 80. At the moment the circuit breaker 31 is opened, the capacitor of inverter 20 is charged first, and at the same time the timer 70 starts. During the counting period of timer 70, BMS 50 does not start, thereby effectively protecting BMS 50, preventing BMS 50 from being damaged at the moment the circuit starts, effectively improving the service life of the product, saving operating costs, and making it highly practical.

[0024] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0025] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A home battery storage system with BMS protection function, comprising a battery pack, an inverter, a BMS, wherein a capacitor C1 is arranged on the inverter, and the capacitor C1 is connected in parallel between the negative access end and the positive access end of the inverter, characterized in that, The application further comprises a first connecting circuit, a second connecting circuit and a starting circuit, the first connecting circuit connects the negative pole of the battery pack and the negative pole access end of the inverter, the second connecting circuit connects the positive pole of the battery pack and the positive pole access end of the inverter, the BMS is connected in parallel on the first connecting circuit, the starting circuit is connected on the first connecting circuit, the second connecting circuit and the BMS, the starting circuit comprises a timer and a switch, the timer comprises a power input end, a power output end, a first signal access end and a second signal access end, the power input end of the timer is connected on the second connecting circuit, the power output end of the timer is connected on the circuit between the first connecting circuit and the inverter, and the BMS, the first signal access end, the second signal access end and the switch form a series loop.

2. The home battery system with BMS protection function according to claim 1, characterized in that, The first connecting circuit comprises a resistor R1 and a circuit breaker, wherein the negative pole of the battery pack, the resistor R1, the circuit breaker and the negative pole access end of the inverter are connected in series.

3. The home battery system with BMS protection function according to claim 2, characterized in that, The power output end of the timer is connected on the circuit between the circuit breaker and the inverter.

4. The home battery system with BMS protection function according to claim 2, characterized in that, The BMS comprises a first collection end and a second collection end, the first collection end and the second collection end are connected in parallel on the resistor R1 and the circuit breaker.

5. The home battery system with BMS protection function according to claim 1, characterized in that, The BMS further comprises a first detection end and a second detection end, the first detection end, the first signal access end, the second signal access end, the switch and the second detection end form a series loop.

Images