Battery input polarity automatic correction circuit and energy storage system

Abstract

The utility model discloses an input polarity automatic correction circuit of a battery and an energy storage system. The circuit comprises a first battery input pole and a second battery input pole, and the first battery input pole and the second battery input pole are respectively connected to a positive pole and a negative pole of an energy storage converter through a polarity switching unit; the input polarity automatic correction circuit further comprises a polarity switching trigger unit, and when the polarity of the input battery is not consistent with the polarity of the energy storage converter, the first battery input electrode and the second battery input electrode are switched to be connected to the positive electrode and the negative electrode of the energy storage converter through the polarity switching trigger unit. According to the input polarity automatic correction circuit, the number of used control components is small, and the control logic is simple.

Description

Technical Field

[0001] The present application relates to the field of power storage technology, and more particularly to a battery input polarity automatic correction circuit and an energy storage converter. Background Art

[0002] The energy storage inverter and battery are the core components of the energy storage system. The energy storage inverter realizes the mutual conversion between the grid power and the battery chemical energy or converts the battery chemical energy into electrical energy to supply the load. The correct connection of the positive and negative poles of the battery to the DC port of the energy storage inverter according to the technical requirements is the basic requirement for the normal operation of the energy storage system. The existing energy storage inverter battery input polarity correction technology solution is as follows:

[0003] Manual correction scheme for battery input polarity: Use instruments to measure the DC voltage value of the positive input to the negative input of the DC port of the energy storage inverter; if the DC voltage value is positive, the battery input polarity meets the technical requirements; if the DC voltage value is negative, the battery input polarity does not meet the technical requirements, and the battery input polarity should be corrected by replacing the battery input cables.

[0004] Automatic correction scheme with thyristor as the core: two DC voltages sample the battery input and the DC capacitor of the energy storage converter respectively. According to the comparison result of the comparison circuit, different thyristors are triggered according to the predetermined control logic to realize the correction of the battery input polarity.

[0005] However, both of the above technical solutions have some defects:

[0006] Disadvantages of manual correction of battery input polarity: It requires an instrument to measure DC voltage and determine whether the battery input polarity is correct based on the measurement results. If it is not satisfied, the battery cable sequence needs to be manually adjusted.

[0007] The disadvantages of the automatic correction solution with thyristor as the core are: two DC voltage sampling circuits and comparison circuits need to be configured, and the thyristor needs to be equipped with a heat dissipation device.

[0008] It should be noted that the statements herein merely provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0009] In view of the above problems, the present application proposes a battery input polarity automatic correction circuit and an energy storage system that overcome the above problems or at least partially solve the above problems.

[0010] The present application embodiment adopts the following technical solutions:

[0011] In a first aspect, an embodiment of the present application provides a battery input polarity automatic correction circuit, characterized in that the circuit comprises: a first battery input pole and a second battery input pole, the first battery input pole and the second battery input pole are respectively connected to the positive pole and the negative pole of the energy storage inverter through a polarity switching unit; the input polarity automatic correction circuit also comprises a polarity switching trigger unit, when the input battery polarity is inconsistent with the energy storage inverter polarity, the first battery input pole and the second battery input pole are switched to be connected to the positive pole and the negative pole of the energy storage inverter through the polarity switching trigger unit.

[0012] Preferably, the polarity switching trigger unit is connected in parallel to the input polarity automatic correction circuit, the polarity switching trigger unit includes a unidirectional conducting element, a voltage dividing element and a trigger element, and the unidirectional conducting element, the voltage dividing element and the trigger element are connected in series in the polarity switching trigger unit; the polarity switching unit is connected in series to the input polarity automatic correction circuit, and the polarity switching unit includes two normally closed contacts and two normally open contacts.

[0013] Preferably, the unidirectional conducting element comprises a diode, the voltage dividing element comprises a resistor, the trigger element comprises a relay, the polarity switching unit comprises a contactor, the contactor is connected to the relay, and the contactor is powered separately.

[0014] In a second aspect, an embodiment of the present application further provides an energy storage system, comprising the battery input polarity automatic correction circuit as described in the first aspect.

[0015] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0016] First, the present application can automatically realize the automatic correction of the battery input polarity without the use of instruments and the participation of debugging personnel; secondly, the present application can automatically realize the automatic correction of the battery input polarity without the need for a DC voltage sampling circuit and a comparison circuit, a thyristor trigger circuit and a heat dissipation device.

[0017] The above description of the technical solution of the present application is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 Schematic diagram of the automatic correction circuit of the input polarity of the battery in the embodiment of the present application;

[0020] Figure 2 This is a circuit diagram of automatic correction of battery input polarity in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0022] The idea of ​​the present application is to propose an automatic correction circuit for the input polarity of a battery in view of the fact that the existing polarity correction circuits have a large number of components and complex control logic. The circuit does not need to be configured with two DC voltage sampling circuits and comparison circuits, thyristors and heat dissipation devices to complete the automatic correction of the input polarity of the battery.

[0023] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0024] The present application embodiment provides a battery input polarity automatic correction circuit and energy storage system, such as Figure 1 As shown, an automatic input polarity correction circuit for a battery in an embodiment of the present application is provided, the circuit comprising: a first battery input pole and a second battery input pole, the first battery input pole and the second battery input pole are respectively connected to the positive pole and the negative pole of an energy storage inverter through a polarity switching unit; the automatic input polarity correction circuit also comprises a polarity switching trigger unit, when the input battery polarity is inconsistent with the polarity of the energy storage inverter, the first battery input pole and the second battery input pole are switched to be connected to the positive pole and the negative pole of the energy storage inverter through the polarity switching trigger unit.

[0025] In some examples of the present application, the polarity switching trigger unit is connected in parallel to the input polarity automatic correction circuit, and the polarity switching trigger unit includes a unidirectional conductive element, a voltage dividing element and a trigger element, and the unidirectional conductive element, the voltage dividing element and the trigger element are connected in series in the polarity switching trigger unit; wherein the unidirectional conductive element includes a diode, the voltage dividing element includes a resistor, and the trigger element includes a relay. The polarity switching unit is connected in series to the input polarity automatic correction circuit, and the polarity switching unit includes two normally closed contacts and two normally open contacts; wherein the polarity switching unit includes a contactor. The contactor is connected to the relay, and specifically, the normally open contact of the relay controls whether the coil of the contactor is energized or not, and the four contacts of the contactor are connected between the battery input and the positive and negative inputs of the converter. The contactor is powered separately.

[0026] like Figure 2 The circuit diagram of the battery input polarity automatic correction is shown, KM1 is a contactor with two normally closed contacts and two normally open contacts. When the positive pole of the battery is connected to the battery input pole 1 and the negative pole of the battery is connected to the battery input pole 2, the diode D1 is reversely cut off, the battery voltage is entirely borne by the diode, the relay K1 is not energized, and the normally open contact of the relay K1 remains disconnected; the coil of the contactor KM1 is not energized, the normally open contact remains normally open, and the normally closed contact remains normally closed; the positive pole of the battery is connected to the positive pole of the energy storage converter, and the negative pole of the battery is connected to the negative pole input of the energy storage converter.

[0027] When the positive pole of the battery is connected to the second battery input pole and the negative pole of the battery is connected to the first battery input pole, the diode D1 is forward-conducted and the forward voltage drop of the diode D1 is; the voltage-dividing resistor R1 and the internal resistance R of the relay K1 coil in Voltage division, relay K1 coil terminal voltage Among them, according to specific needs, U Rin The design value meets the operating voltage range of the relay K1 coil; the normally open contact of relay K1 is closed, the contactor KM1 coil is energized, the normally open contact is closed, and the normally closed contact is disconnected; the positive pole of the battery is connected to the positive input of the energy storage inverter, and the negative pole of the battery is connected to the negative input of the energy storage inverter.

[0028] It can be seen that when the battery input polarity is the same as the polarity required by the energy storage converter, the battery is correctly connected to the DC port of the energy storage converter through the two normally closed contacts of the contactor KM1; when the battery input polarity is different from the polarity required by the energy storage converter, the normally open contact of the relay K1 in the battery polarity detection circuit is closed, the normally open contact of the contactor KM1 is disconnected, the normally open contact of the contactor KM1 is closed, and the battery is correctly connected to the DC port of the energy storage converter through the two normally open contacts of the contactor KM1. The two wiring methods of the battery input are corrected by this correction circuit, so that the positive pole of the battery is connected to the positive input of the energy storage converter, and the negative pole of the battery is connected to the negative input of the energy storage converter.

[0029] The present application also provides an energy storage system, including the battery input polarity automatic correction circuit in the present application. As for other parts of the energy storage system, they are prior art and will not be described in detail in the present application.

[0030] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0035] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery input polarity automatic correction circuit, characterized in that: The circuit comprises: a first battery input pole and a second battery input pole, wherein the first battery input pole and the second battery input pole are respectively connected to the positive pole and the negative pole of the energy storage converter through a polarity switching unit; The input polarity automatic correction circuit also includes a polarity switching trigger unit. When the input battery polarity is inconsistent with the energy storage inverter polarity, the polarity switching trigger unit switches the first battery input pole and the second battery input pole to connect to the positive pole and negative pole of the energy storage inverter.

2. The input polarity automatic correction circuit according to claim 1, characterized in that: The polarity switching trigger unit is connected in parallel to the input polarity automatic correction circuit, and the polarity switching trigger unit includes a unidirectional conductive element, a voltage dividing element and a trigger element, and the unidirectional conductive element, the voltage dividing element and the trigger element are connected in series in the polarity switching trigger unit.

3. The input polarity automatic correction circuit according to claim 2, characterized in that: The polarity switching unit is connected in series in the input polarity automatic correction circuit, and the polarity switching unit includes two normally closed contacts and two normally open contacts.

4. The input polarity automatic correction circuit according to claim 3, characterized in that: The unidirectional conducting element includes a diode, the voltage dividing element includes a resistor, and the triggering element includes a relay.

5. The input polarity automatic correction circuit according to claim 4, characterized in that: The polarity switching unit includes a contactor.

6. The input polarity automatic correction circuit according to claim 5, characterized in that: The contactor is connected to the relay.

7. The input polarity automatic correction circuit according to claim 5, characterized in that: The contactors are powered separately.

8. An energy storage system, characterized in that: An automatic input polarity correction circuit for a battery comprising the circuit as claimed in any one of claims 1 to 7.

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