Household energy storage system

Abstract

The utility model provides a household energy storage system. The household energy storage system comprises a battery management system, a battery system, an inverter and a main contactor. The battery system is connected between the inverters through the main contactor and is used for outputting alternating current through the inverters. The signal output end of the battery management system is connected with a control switch of the main contactor and used for controlling the on-off state of the main contactor. The technical problem of how to improve the safety and reliability of the household energy storage system in the prior art can be solved, and the on-off state of the main contactor between the battery system and the inverter is controlled through the battery management system, so that the technical effect of improving the safety and reliability of the household energy storage control system is achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a household energy storage system. Background Art

[0002] Household energy storage is also called home storage. The household energy storage system is a new type of energy storage device that can store renewable energy for home use. This system consists of battery cells, battery management system, energy management system, energy storage bidirectional converter, and other supporting systems. The technical solutions in the prior art usually directly connect the battery system to the mains through a switch module, which has poor safety. In the event of failure of the switch module or instability of the switch module, it is dangerous to the battery system.

[0003] Therefore, how to improve the safety and reliability of household energy storage systems is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of the present invention is to provide a safe and reliable household energy storage system.

[0005] To achieve the above object, the present disclosure provides a household energy storage system, including: a battery management system, a battery system, an inverter and a main contactor;

[0006] The battery system is connected to the inverter via the main contactor, and is used to output AC power via the inverter;

[0007] The signal output end of the battery management system is connected to the control switch of the main contactor for controlling the on-off state of the isolation switch.

[0008] In an exemplary embodiment, further comprising: a contactor;

[0009] The pre-charging contactor is connected in parallel with the main contactor between the battery system and the inverter, and is used to carry or disconnect the current between the battery system and the inverter;

[0010] The signal output end of the battery management system is connected to the control switch of the pre-charging contactor, so as to control the on-off state of the pre-charging contactor.

[0011] In an exemplary embodiment, the pre-charge contactor includes: a pre-charge resistor;

[0012] The pre-charging resistor is arranged at one end of the pre-charging contactor connected to the battery system.

[0013] In an exemplary embodiment, the battery system includes a plurality of battery packs connected in series;

[0014] The battery management system includes a battery control unit and a plurality of battery management units corresponding one to one with the battery packs;

[0015] The acquisition end of each battery management unit is connected to the corresponding battery pack and is used to collect battery data of the corresponding battery pack;

[0016] The communication terminal of the battery control unit is connected to the communication terminals of each battery management unit, and is used to receive data of each battery and send control instructions to each battery management unit.

[0017] In an exemplary embodiment, a signal output terminal of the battery management system is connected to a signal output terminal of the battery control unit.

[0018] In an exemplary embodiment, the battery management system is communicatively connected to the inverter for sending a power setting instruction to the inverter.

[0019] In an exemplary embodiment, further comprising: a circuit breaker;

[0020] The circuit breaker is arranged between the battery system and the inverter, and is used to carry or disconnect the current between the battery system and the inverter;

[0021] The signal output end of the battery management system is connected to the control line of the circuit breaker for controlling the on / off state of the circuit breaker.

[0022] In an exemplary embodiment, the control switch of the main contactor includes: an electromagnetic coil;

[0023] The electromagnetic coil is used to generate a magnetic field that attracts the main contactor to turn on and off when receiving a changing current signal;

[0024] The signal output end of the battery management system is connected to the connection end of the electromagnetic coil through an amplifier circuit, so as to input the variable current signal into the electromagnetic coil.

[0025] In an exemplary embodiment, the control switch of the pre-charging contactor includes: an electromagnetic coil;

[0026] The electromagnetic coil is used to generate a magnetic field that attracts the pre-charging contactor to turn on and off when receiving a changing current signal;

[0027] The signal output end of the battery management system is connected to the connection end of the electromagnetic coil through an optical coupler and an amplifier circuit, so as to input the variable current signal into the electromagnetic coil.

[0028] In an exemplary embodiment, it further includes: a wireless communication module;

[0029] The wireless communication module is connected to the wireless communication port of the battery management system and is used to receive and upload battery data.

[0030] The technical solution of the present disclosure is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following drawings are only intended to illustrate and explain the present disclosure, and are not intended to limit the scope of the present disclosure.

[0032] Figure 1 It is a simplified structural diagram of a household energy storage system according to an embodiment of the present disclosure.

[0033] Figure 2 This is one of the structural schematic diagrams of a household energy storage system of an optional embodiment of the present disclosure.

[0034] Figure 3 This is the second structural schematic diagram of a household energy storage system according to an optional embodiment of the present disclosure.

[0035] Figure 4 This is the third structural schematic diagram of a household energy storage system according to an optional embodiment of the present disclosure.

[0036] Figure 5 This is the fourth schematic diagram of the structure of a household energy storage system according to an optional embodiment of the present disclosure.

[0037] Figure 6 This is the fifth structural schematic diagram of a household energy storage system according to an optional embodiment of the present disclosure.

[0038] Figure 7 This is the sixth structural schematic diagram of a household energy storage system according to an optional embodiment of the present disclosure.

[0039] Figure 8 This is the seventh schematic diagram of the structure of a household energy storage system according to an optional embodiment of the present disclosure.

[0040] Fig. 9 This is the eighth structural schematic diagram of a household energy storage system according to an optional embodiment of the present disclosure.

[0041] Fig.10 This is the ninth structural diagram of a household energy storage system according to an optional embodiment of the present disclosure.

[0042] Fig.11 It is a connection diagram of a household energy storage system according to an optional embodiment of the present disclosure.

[0043] Fig.12 It is a schematic diagram of an on-off control circuit of a main contactor or a pre-charging contactor of a household energy storage system in an optional embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0045] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0046] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0047] In this embodiment, a household energy storage system is provided. Figure 1 is a simplified structural diagram of a household energy storage system according to an embodiment of the present disclosure. Figure 1 As shown, it includes: battery management system, battery system, inverter and main contactor.

[0048] The battery system is connected to the inverter via the main contactor, and is used to output alternating current through the inverter.

[0049] The battery system may be composed of battery packs connected in series. The inverter may be used to convert the DC power of the battery system into AC power for household use. The main contactor may be provided with an electromagnetic control coil, and the on-off control is controlled by the change of the coil current. The total positive busbar and the total negative busbar of the battery system and the inverter may be connected to an independent main contactor respectively.

[0050] The signal output terminal of the battery management system is connected to the control switch of the main contactor to control the on / off state of the main contactor.

[0051] The battery management system may include a battery management unit and a battery control unit. The battery management unit may be arranged in each battery pack of the battery system to detect battery parameters such as voltage, current, temperature, insulation detection and high-voltage interlock detection of the battery cells of the corresponding battery pack. The battery control unit may judge the operating state of the battery system based on the battery parameters of each battery management unit and send a signal related to the on-off state of the main contactor.

[0052] In the disclosed embodiment, the battery system is connected to the inverter through the main contactor, and is used to output AC power through the inverter. The signal output terminal of the battery management system is connected to the control switch of the main contactor, and is used to control the on-off state of the main contactor. The technical problem of how to improve the safety and reliability of household energy storage systems in related technologies can be solved. The on-off state of the main contactor between the battery system and the inverter is controlled by the battery management system, thereby achieving the technical effect of improving the safety and reliability of household energy storage control systems.

[0053] In an exemplary embodiment, Figure 2 is one of the structural diagrams of a household energy storage system according to an optional embodiment of the present disclosure, such as Figure 2 As shown, it also includes: a pre-charge contactor.

[0054] The pre-charging contactor is connected in parallel with the main contactor between the battery system and the inverter, and is used to carry or disconnect the current between the battery system and the inverter.

[0055] The signal output terminal of the battery management system is connected to the control switch of the pre-charging contactor, so as to control the on-off state of the pre-charging contactor.

[0056] The above-mentioned pre-charging contactor may be provided with an electromagnetic control coil, and the on-off is controlled by the change of the coil current.

[0057] Through the above embodiments, a pre-charging contactor controlled by a battery management system is provided between the battery system and the inverter, which can realize rapid shutoff or connection of the power supply line from the battery system to the inverter, thereby further improving the safety and reliability of the system.

[0058] In an exemplary embodiment, Figure 3 This is a second schematic diagram of the structure of a household energy storage system according to an optional embodiment of the present disclosure. Figure 3 As shown, the above-mentioned pre-charging contactor includes: a pre-charging resistor.

[0059] The pre-charging resistor is arranged at one end of the pre-charging contactor connected to the battery system.

[0060] Through the above embodiment, a pre-charging resistor is set at one end of the pre-charging contactor connected to the above-mentioned battery system. Due to the existence of the pre-charging resistor, the charging current of the entire circuit is limited. Compared with the loop current formed by directly connecting the main contactor, the charging current is much reduced, thereby avoiding directly connecting the load, resulting in a large charging current and sparking, thereby achieving the technical effect of reducing or eliminating the surge current when the above-mentioned contactor is closed.

[0061] In an exemplary embodiment, Figure 4 This is a third schematic diagram of the structure of a household energy storage system according to an optional embodiment of the present disclosure. Figure 4 As shown, the battery system includes a plurality of battery packs connected in series.

[0062] The battery management system comprises a battery control unit and a plurality of battery management units corresponding one to one with the battery packs.

[0063] The battery management unit may be disposed inside each battery pack.

[0064] The acquisition end of each of the above-mentioned battery management units is connected to the corresponding above-mentioned battery pack for acquiring battery data of the above-mentioned battery pack.

[0065] The communication terminal of the battery control unit is connected to the communication terminals of each battery management unit, and is used to receive data of each battery and send control instructions to each battery management unit.

[0066] Through the above embodiments, a battery management unit is used to independently monitor each battery pack in the battery system, and corresponding battery data is obtained for the battery management unit to analyze and process and further generate instructions, thereby achieving the technical effect of accurately managing the operating status of the battery system.

[0067] In an exemplary embodiment, Figure 5 This is a fourth schematic diagram of the structure of a household energy storage system according to an optional embodiment of the present disclosure. Figure 5 As shown, the signal output end of the battery management system is connected to the signal output end of the battery control unit.

[0068] Through the above embodiment, the battery management unit outputs a signal, thereby controlling the main contactor and the pre-charging contactor.

[0069] In an exemplary embodiment, Figure 6 This is a fifth structural diagram of a household energy storage system according to an optional embodiment of the present disclosure. Figure 6 As shown, the battery management system is communicatively connected to the inverter and is used to send a power setting instruction to the inverter.

[0070] The communication bus may be a communication bus based on the CAN (Control Area Network) protocol. Preferably, the inverter may also receive battery data reported by the management system.

[0071] Through the above embodiments, the battery management system communicates with the inverter via the control local area network bus, and then controls the output power of the inverter, thereby achieving the technical effect of enriching the system control function and further improving the safety and reliability of the system.

[0072] In an exemplary embodiment, Figure 7This is a sixth structural diagram of a household energy storage system according to an optional embodiment of the present disclosure, such as Figure 7 As shown, it also includes: a circuit breaker.

[0073] The circuit breaker is arranged between the battery system and the inverter, and is used for carrying or disconnecting the current between the battery system and the inverter.

[0074] The signal output terminal of the battery management system is connected to the control line of the circuit breaker to control the on / off state of the circuit breaker.

[0075] Through the above embodiments, a circuit breaker controlled by a battery management system is provided between the battery system and the inverter, which can realize rapid shutoff or connection of the power supply line from the battery system to the inverter, thereby further improving the safety and reliability of the system.

[0076] In an exemplary embodiment, Figure 8 FIG. 7 is a schematic diagram of a household energy storage system structure of an optional embodiment of the present disclosure. Figure 8 As shown, the control switch of the main contactor includes: an electromagnetic coil.

[0077] The electromagnetic coil is used to generate a magnetic field that attracts the main contactor to turn it on and off when receiving a changing current signal.

[0078] The signal output terminal of the battery management system is connected to the connection terminal of the electromagnetic coil through an amplifier circuit, so as to input the variable current signal into the electromagnetic coil.

[0079] The above-mentioned changing current signal may be an alternating current signal.

[0080] Through the above embodiment, a main contactor with an electromagnetic coil is used as a control switch, and the main contactor is controlled to open or close after receiving a changing current signal amplified by an amplifier circuit sent by a battery management system, thereby achieving a technical effect of simply and conveniently controlling the on and off state of the main contactor.

[0081] In an exemplary embodiment, Fig. 9 FIG. 8 is a schematic diagram of a household energy storage system structure of an optional embodiment of the present disclosure. Fig. 9 As shown, the control switch of the above-mentioned pre-charging contactor includes: an electromagnetic coil.

[0082] The electromagnetic coil is used to generate a magnetic field that attracts the pre-charging contactor to turn it on and off when receiving a changing current signal.

[0083] The signal output end of the battery management system is connected to the connection end of the electromagnetic coil through an optical coupler and an amplifier circuit, so as to input the variable current signal into the electromagnetic coil.

[0084] Through the above embodiment, a pre-charging contactor with an electromagnetic coil is used as a control switch, and the pre-charging contactor is controlled to be opened or closed upon receiving a changing current signal sent by a battery management system that is isolated by an optocoupler and amplified by an amplifier circuit, thereby achieving a technical effect of simply and conveniently controlling the on and off state of the pre-charging contactor.

[0085] In an exemplary embodiment, Fig.10 This is a ninth structural diagram of a household energy storage system according to an optional embodiment of the present disclosure. Fig.10 As shown, it also includes: a wireless communication module.

[0086] The wireless communication module is connected to the wireless communication port of the battery management system and is used to receive and upload battery data.

[0087] Through the above-mentioned embodiments, the wireless communication module is used to upload the battery data collected by the battery management system to a cloud server or other equipment, so that the household energy storage system can be remotely monitored.

[0088] Fig.11 is a connection diagram of a household energy storage system according to an optional embodiment of the present disclosure. Fig.11 As shown, it includes: a battery management system BMS (Battery Management System), several battery packs, a circuit breaker QF, main contactors KM1, KM2, a pre-charge contactor KM3, a pre-charge resistor Pre-CR (Pre-Charge Resistor), a wireless communication module WIFI, fuses FU1, FU2, a power supply, and a switch KM4.

[0089] Among them, each battery pack is connected in series to form a battery system. The total negative pole and the total positive pole are connected in series with fuses FU1, FU2, circuit breakers QF, main contactors KM1, KM2 respectively, and the output port formed is connected to the inverter. The pre-charging group is connected in series with the contactor and then in parallel at both ends of the main contactor KM1. The battery management unit in the battery management system collects battery data in each battery pack. The battery control unit in the battery management system receives the battery data sent by each battery management unit, and connects the electromagnetic coils of the circuit breaker, main contactor, and pre-charging contactor to control their on and off states. The power supply belt energy supplies power to the wireless communication module through switch KM4. The wireless communication module connects to the battery management unit of the battery management system and receives battery data.

[0090] Fig.12 : is a schematic diagram of the on-off control circuit of the main contactor or pre-charge contactor of a household energy storage system according to an optional embodiment of the present disclosure, such as Fig.12 As shown, including:

[0091] The MCU (Microcontroller Unit) of the battery control unit turns on the optocoupler U11 by outputting a low-level signal, thereby pulling up the level of the amplifier Q44 pin, thereby turning on the electromagnetic coil of the main contactor or the pre-charging contactor. The electromagnetic coil generates current and an induced magnetic field, thereby attracting the switch in the main contactor or the pre-charging contactor, controlling its on and off state, and turning on the main contactor or the pre-charging contactor.

[0092] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0093] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other. The present disclosure is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or permutation of these aspects and / or embodiments. Moreover, each aspect and / or embodiment of the present disclosure may be used alone or in combination with one or more other aspects and / or embodiments thereof.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present disclosure, and they should all be included in the scope of the claims and specification of the present disclosure.

Claims

1. A household energy storage system, characterized in that: include: Battery management system, battery system, inverter and main contactor; The battery system is connected to the inverter via the main contactor, and is used to output AC power via the inverter; The signal output end of the battery management system is connected to the control switch of the main contactor for controlling the on / off state of the main contactor.

2. The household energy storage system according to claim 1, characterized in that: Also includes: Pre-charge contactor; The pre-charging contactor is connected in parallel with the main contactor between the battery system and the inverter, and is used to carry or disconnect the current between the battery system and the inverter; The signal output end of the battery management system is connected to the control switch of the pre-charging contactor, so as to control the on-off state of the pre-charging contactor.

3. The household energy storage system according to claim 2, characterized in that: The pre-charge contactor comprises: a pre-charge resistor; The pre-charging resistor is arranged at one end of the pre-charging contactor connected to the battery system.

4. The household energy storage system according to any one of claims 1 to 3, characterized in that: The battery system includes a plurality of battery packs connected in series; The battery management system includes a battery control unit and a plurality of battery management units corresponding one to one with the battery packs; The acquisition end of each battery management unit is connected to the corresponding battery pack and is used to collect battery data of the corresponding battery pack; The communication terminal of the battery control unit is connected to the communication terminals of each battery management unit, and is used to receive data of each battery and send control instructions to each battery management unit.

5. The household energy storage system according to claim 4, characterized in that: The signal output end of the battery management system is connected to the signal output end of the battery control unit.

6. The household energy storage system according to any one of claims 1 to 3, characterized in that: The battery management system is communicatively connected to the inverter and is used to send a power setting instruction to the inverter.

7. The household energy storage system according to any one of claims 1 to 3, characterized in that: Also includes: breaker; The circuit breaker is arranged between the battery system and the inverter, and is used to carry or disconnect the current between the battery system and the inverter; The signal output end of the battery management system is connected to the control line of the circuit breaker for controlling the on / off state of the circuit breaker.

8. The household energy storage system according to any one of claims 1 to 3, characterized in that: The control switch of the main contactor comprises: an electromagnetic coil; The electromagnetic coil is used to generate a magnetic field that attracts the main contactor to turn on and off when receiving a changing current signal; The signal output end of the battery management system is connected to the connection end of the electromagnetic coil through an amplifier circuit, so as to input the variable current signal into the electromagnetic coil.

9. The household energy storage system according to any one of claims 2 or 3, characterized in that: The control switch of the pre-charging contactor comprises: an electromagnetic coil; The electromagnetic coil is used to generate a magnetic field that attracts the pre-charging contactor to turn on and off when receiving a changing current signal; The signal output end of the battery management system is connected to the connection end of the electromagnetic coil through an optical coupler and an amplifier circuit, so as to input the variable current signal into the electromagnetic coil.

10. The household energy storage system according to any one of claims 1 to 3, characterized in that: Also includes: Wireless communication module; The wireless communication module is connected to the wireless communication port of the battery management system and is used to receive and upload battery data.

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