Monobloc battery open circuit freewheel device

Abstract

The utility model discloses a single storage battery open circuit freewheeling device belongs to storage battery monitoring technical field, include: transition diode unit, freewheeling diode unit, direct current contactor and freewheeling monitoring arrangement, the positive, negative both ends of transition diode unit are connected in the negative, positive pole of single storage battery respectively, constitute transition loop, the positive, negative both ends of freewheeling diode unit are connected in the negative, positive pole of single storage battery respectively, constitute main freewheeling loop, be equipped with direct current contactor between transition loop and main freewheeling loop, direct current contactor still with the control end electric connection of freewheeling monitoring arrangement, and the data input of freewheeling monitoring arrangement is connected with the operation data output of single storage battery, and freewheeling monitoring arrangement can trigger the intercommunication main freewheeling loop through direct current contactor.

Description

Technical Field

[0001] This utility model relates to the field of battery monitoring technology, and more specifically, to a single-cell battery open-circuit freewheeling device. Background Technology

[0002] The existing technology has the following technical problems: For the series-connected battery packs that are commonly used in DC power and communication power in substations, if a single battery cell is open-circuited, the entire battery pack will fail. In this state, if an AC power outage occurs, the substation protection control and communication systems will be paralyzed. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a single-cell battery open-circuit freewheeling device, which can prevent the risk of unexpected power outage of DC bus caused by single-cell battery open circuit, and also avoid overheating damage to the transition diode.

[0004] The objective of this utility model is achieved through the following solution: A single-cell open-circuit freewheeling device includes: a transition diode unit, a freewheeling diode unit, a DC contactor, and a freewheeling monitoring device; the positive and negative terminals of the transition diode unit are respectively connected to the negative and positive terminals of the single-cell battery, forming a transition circuit; the positive and negative terminals of the freewheeling diode unit are respectively connected to the negative and positive terminals of the single-cell battery, forming a main freewheeling circuit; a DC contactor is provided between the transition circuit and the main freewheeling circuit, and the DC contactor is also electrically connected to the control terminal of the freewheeling monitoring device; the freewheeling monitoring device also includes a data input terminal, and the data input terminal is connected to the operating data output terminal of the single-cell battery; the freewheeling monitoring device connects or disconnects the main freewheeling circuit by triggering the DC contactor.

[0005] Furthermore, the freewheeling monitoring device is connected to the online battery monitoring device or an independent battery monitoring module, and receives the operating data of individual batteries through serial communication.

[0006] Furthermore, the serial port includes an RS485 serial port.

[0007] Furthermore, the operating data of the individual battery includes voltage data, temperature data, and internal resistance data.

[0008] Furthermore, the transition diode unit is specifically formed by connecting two transition diodes in series.

[0009] Furthermore, the transition diode is specifically a Schottky diode.

[0010] Furthermore, the freewheeling diode has a carrying current of less than or equal to 150A.

[0011] Furthermore, the DC contactor is selected with a contact resistance of less than 0.4mΩ.

[0012] Furthermore, the single-cell open-circuit freewheeling device and the battery online monitoring device share a cabinet or are installed in a separate cabinet.

[0013] Furthermore, the freewheeling monitoring device includes multiple control ports, and the multiple control ports are electrically connected to the corresponding DC contactors of the multiple single-cell battery open-circuit freewheeling devices.

[0014] The beneficial effects of this utility model are: This utility model device is suitable for individual batteries with poor performance parameters in battery packs. It can prevent the risk of unexpected power outages of the DC bus caused by open circuits in individual batteries, and can also avoid damage to the transition diodes due to overheating. Attached Figure Description

[0015] The accompanying drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the open-circuit freewheeling device for a single battery in an embodiment of this utility model. Figure 2 This is a schematic diagram of the open-circuit freewheeling device for multiple batteries in an embodiment of the present invention. Detailed Implementation

[0017] All features disclosed in all embodiments of this specification, or all features implicitly disclosed, may be combined or substituted in any way, except for mutually exclusive features.

[0018] The technical solution of this utility model is further described in detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to what is described below. Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0019] Before describing the embodiments, some necessary terms need to be explained. For example: When the terms “comprising” and / or “including” are used in this specification, these terms indicate the presence of the said feature, integral, operation, element and / or component, but do not exclude the presence and / or addition of more than one other feature, integral, operation, element, component and / or group thereof.

[0020] like Figure 1 As shown, a single-cell open-circuit freewheeling device for a storage battery is characterized by comprising: a transition diode unit, a freewheeling diode unit, a DC contactor, and a freewheeling monitoring device. The positive and negative terminals of the transition diode unit are respectively connected to the negative and positive terminals of the individual battery, forming a transition circuit; the positive and negative terminals of the freewheeling diode unit are respectively connected to the negative and positive terminals of the individual battery, forming a main freewheeling circuit; a DC contactor is provided between the transition circuit and the main freewheeling circuit, and the DC contactor is also electrically connected to the control terminal of the freewheeling monitoring device; the freewheeling monitoring device also includes a data input terminal, and the data input terminal is connected to the operating data output terminal of the individual battery; the freewheeling monitoring device connects or disconnects the main freewheeling circuit by triggering the DC contactor.

[0021] The working principle of this utility model is as follows: When a single cell is open-circuited during the discharge process of the battery, the transition circuit realizes a short-term freewheeling transition, thereby avoiding a short-term power outage of the DC bus caused by the open circuit; when the freewheeling diode unit is triggered to connect, the voltage drop of the main freewheeling circuit is lower than that of the transition circuit, and the current flows through the freewheeling diode unit circuit, thereby avoiding overheating and damage to the transition diode.

[0022] In other embodiments of this utility model, the freewheeling monitoring device is connected to an online battery monitoring device or an independent battery monitoring module, and receives the operating data of individual batteries through serial communication.

[0023] In other embodiments of this utility model, the serial port includes an RS485 serial port.

[0024] In other embodiments of this utility model, the operating data of the single battery cell includes voltage data, temperature data, and internal resistance data.

[0025] In other embodiments of this utility model, the transition diode unit is specifically formed by connecting two transition diodes in series.

[0026] In other embodiments of this invention, the transition diode is specifically a Schottky diode.

[0027] In other embodiments of this utility model, the freewheeling diode carries a current of less than or equal to 150A.

[0028] In other embodiments of this utility model, the DC contactor is selected from those with a contact resistance of less than 0.4mΩ.

[0029] In other embodiments of this utility model, the single-cell open-circuit current-following device and the battery online monitoring device share a cabinet or are installed in a separate cabinet, specifically with dimensions of 2260mm high × 600mm wide × 600mm deep.

[0030] In other embodiments of this utility model, the freewheeling monitoring device includes multiple control ports, and the multiple control ports are electrically connected to the corresponding DC contactors of multiple single-cell open-circuit freewheeling devices, such as... Figure 2 As shown in the embodiment, a single set of the present invention can meet the open-circuit protection requirements of eight individual batteries.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" are used in a broad sense and should be interpreted broadly by those skilled in the art. For example, it can refer to a fixed connection, a movable connection, an integral connection, or a partial connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal connection of two components, etc. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. That is, the expression of the written language can flexibly correspond to the implementation of the actual technology. The expression of the written language (including the drawings) in the specification of this utility model does not constitute any single limiting interpretation of the claims.

Claims

1. A single-cell open-circuit freewheeling device, characterized in that, include: Transition diode unit, freewheeling diode unit, DC contactor and freewheeling monitoring device; The positive and negative terminals of the transition diode unit are respectively connected to the negative and positive terminals of the individual battery, forming a transition circuit; the positive and negative terminals of the freewheeling diode unit are respectively connected to the negative and positive terminals of the individual battery, forming a main freewheeling circuit; a DC contactor is provided between the transition circuit and the main freewheeling circuit, and the DC contactor is also electrically connected to the control terminal of the freewheeling monitoring device; the freewheeling monitoring device also includes a data input terminal, and the data input terminal is connected to the operating data output terminal of the individual battery; the freewheeling monitoring device connects or disconnects the main freewheeling circuit by triggering the DC contactor.

2. The single-cell open-circuit freewheeling device according to claim 1, characterized in that, The freewheeling monitoring device is connected to the online battery monitoring device or an independent battery monitoring module, and receives the operating data of individual batteries through serial communication.

3. The single-cell open-circuit freewheeling device according to claim 2, characterized in that, The serial port includes an RS485 serial port.

4. The single-cell open-circuit freewheeling device according to claim 1, characterized in that, The operating data of the individual battery includes voltage data, temperature data, and internal resistance data.

5. The single-cell open-circuit freewheeling device according to claim 1, characterized in that, The transition diode unit is specifically formed by connecting two transition diodes in series.

6. The single-cell open-circuit freewheeling device according to claim 1, characterized in that, The transition diode is specifically a Schottky diode.

7. The single-cell open-circuit freewheeling device according to claim 1, characterized in that, The freewheeling diode carries a current of less than or equal to 150A.

8. The single-cell open-circuit freewheeling device according to claim 1, characterized in that, The DC contactor selected is a DC contactor with a contact resistance of less than 0.4mΩ.

9. The single-cell open-circuit freewheeling device according to claim 1, characterized in that, The single-cell open-circuit current-following device and the battery online monitoring device share a cabinet or are installed in a separate cabinet.

10. The single-cell open-circuit freewheeling device according to any one of claims 1 to 9, characterized in that, The freewheeling monitoring device includes multiple control ports, and each control port is electrically connected to a corresponding DC contactor of a multiple individual battery open-circuit freewheeling device.

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