CN218783077U - Automatic cutting device for energy storage battery fault module, battery cluster, battery management system and energy storage system - Google Patents

Abstract

The utility model provides an automatic resection device of energy storage battery trouble module. The device structurally comprises a structural support, a battery management unit and an automatic switching device. When an unconventional fault occurs in the energy storage battery module, a fault signal is reported to the battery main control unit through the battery management unit, automatic cut-off is requested, and the battery main control unit sends a switching instruction and reports fault information and updates a power state to the energy storage system after receiving the fault signal. The battery management unit starts to execute after receiving the instruction, at the moment, the battery in the battery module is in a disconnected state, and the rest battery modules can still work continuously, so that the operation stability of the energy storage system is enhanced, and the adverse effect of faults on users is reduced.

Description

Energy storage battery failure module automatic removal device, battery module, battery cluster, battery tube management system and energy storage system

technical field

The utility model belongs to the field of energy storage batteries, in particular to a device for automatically removing fault modules of energy storage batteries.

Background technique

The energy storage system is a crucial part of clean energy, and it is a necessary guarantee for the consumption of new energy and the security of the power grid. Energy storage is one of the most important application forms.

Traditional lithium battery energy storage is to combine battery cells into standard battery module units, then connect them in series to form a high-voltage battery system, and then connect them to an energy storage converter for use. According to different usage scenarios, energy storage systems of various scales can include lithium battery systems ranging from one cluster to dozens, or hundreds of clusters.

In the composition mode of traditional lithium battery energy storage, if one battery module unit of a certain cluster battery system fails, the cluster battery system will fail as a whole, which will adversely affect the usage scenario, especially for a battery system that only contains one cluster battery. Small energy storage systems stop working completely.

At present, the commonly used fault handling scheme in the industry is to install a cut-off device in a single-cluster battery system, disconnect the entire battery system when a fault occurs, and use the battery cluster as the minimum cut-off unit. For example, in a general single cluster battery system, there is no cutting device installed in the battery module, and there is only one master control relay for the entire battery cluster. When any one of the multiple battery modules fails, the overall control relay is disconnected, and the entire battery cluster stops outputting.

The battery system in the prior art has a low fault tolerance rate, and the redundancy function in case of failure is not considered. If one battery module unit of a certain cluster battery system fails, the cluster battery system will fail as a whole, which will adversely affect the usage scenario. In large and medium-sized energy storage, due to the large number of battery clusters, after removing one cluster of faulty battery systems, the battery systems of the remaining clusters can also operate at reduced power. However, for a small energy storage system containing only one cluster of batteries, such as UPS\EPS\distributed energy storage cabinets and other similar application scenarios, the energy storage system will completely stop working, causing inconvenience to users or economic losses.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a device for automatically removing faulty modules of energy storage batteries. The battery module using the device can automatically separate from the battery cluster after a fault, without disconnecting the output circuit of the entire battery cluster, ensuring The remaining battery modules can continue to work, reducing the adverse impact of failures on users. It is of great significance for small energy storage systems equipped with only a single cluster of battery systems, and can avoid shutdowns caused by battery modules. This solution solves the problem when a certain If a battery module unit of the cluster battery system fails, the cluster battery system will fail as a whole, which will adversely affect the usage scenario. At the same time, if the failure of the battery module is automatically restored, the solution also provides support for removed batteries. The module is put back into operation.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an automatic removal device for energy storage battery failure modules, including a structural support on the bottom surface that can be used to fix the battery module, and a battery fixed on the side of the structural support. The management unit is an automatic switching device that can be electrically connected to the battery module and the battery management unit, and the power interface is provided on the side of the structural support, and the power interface can realize the connection between the battery module fixed on the bottom surface of the structural support and Other battery modules and high-voltage control devices are electrically connected.

Preferably, the battery management unit is electrically connected to the battery main control unit through the battery management system interface located on the side of the structural support.

Preferably, the automatic switching device is connected to the battery module through cables and copper and aluminum bars to form a loop, and is connected to the battery management unit through a circuit to form a control loop.

Preferably, the battery module is composed of several lithium battery cells connected in series or in parallel.

Preferably, the automatic switching device is provided with two switching switches, which are respectively used as a normal output switch and a fault output switch.

Preferably, all the switches are connected to the battery main control unit through the battery management unit.

Preferably, the switching switch in the automatic switching device may adopt an electromagnetic relay.

Preferably, the switch in the automatic switching device may use a solid state relay.

Preferably, the switching switch in the automatic switching device can use complementary metal oxide semiconductor (CMOS).

Preferably, the switching switch in the automatic switching device may use an insulated gate bipolar transistor (IGBT).

Preferably, the battery management unit is used for battery information collection in the battery module, battery state calculation and internal control of the battery module.

Preferably, the battery management unit communicates and transmits data with the battery main control unit, and at the same time accepts the unified coordinated control of the battery main control unit.

Preferably, the battery management unit can report a fault signal to the battery main control unit, and at the same time request automatic cut-off.

Preferably, after receiving the fault signal, the battery main control unit can issue a switching instruction and report fault information and update power status to the energy storage system.

The utility model also relates to an energy storage battery module, which includes the above-mentioned automatic cutting device for a faulty module of the energy storage battery, and a battery module set on the bottom surface of the automatic cutting device.

The utility model also relates to an energy storage battery cluster, which is formed by connecting the energy storage battery modules in series.

The utility model also relates to a battery management system, which detects and manages the energy storage battery module or the energy storage battery cluster.

The utility model also relates to an energy storage system, which is composed of the energy storage battery module as a carrier, an energy management system, a central control system and the battery management system.

Preferably, the central control system includes the battery main control unit.

The utility model, through the combination of the automatic switching device and the battery management unit, can quickly and automatically disengage the circuit in the case of a single cluster battery failure, without disconnecting the output circuit of the entire battery cluster and maintaining the remaining The battery module can continue to work, enhance the operation stability of the energy storage system, and reduce the adverse impact of failure on users. And if it is a fault type that can be automatically recovered, this technical solution can also realize the automatic re-commissioning of the faulty module. In the fault state, since the battery pack in the faulty battery module has been disconnected from the battery cluster circuit, it is possible to repair some components of the faulty battery module without powering off the battery system. At the same time, the battery cluster system of this solution can also realize the flexible control of input and output of any battery module in the entire battery cluster, which is very convenient in debugging, testing, and experimental scenarios.

Description of drawings

The accompanying drawings are used for better understanding of the present application, and do not constitute an improper limitation of the present application. in:

Fig. 1 is a schematic structural diagram of an automatic removal device for an energy storage battery failure module provided by the present application.

Fig. 2 is an exploded view of the automatic removal device for the energy storage battery failure module provided by the present application.

Fig. 3 is a schematic diagram of an automatic removal device for an energy storage battery failure module provided by the present application.

Fig. 4 is a schematic diagram of the energy storage battery cluster provided by the present application.

Explanation of reference signs

101-automatic switching device, 102-battery management unit, 103-battery module, 104-structural support, 105-power interface, 106-battery management system interface.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Example 1

This embodiment is an automatic removal device for a faulty module of an energy storage battery, and its composition is as follows:

Please refer to FIG. 2 to FIG. 3 , a device for automatically removing a faulty module of an energy storage battery, including a structural support 104 , a battery management unit 102 , and an automatic switching device 101 . A battery module 103 is fixedly installed on the bottom surface of the structural support 104, and a battery management unit 102 is fixedly installed on the side of the structural support 104. The battery module 103 is composed of lithium batteries b1-b13 connected in series or in parallel. The battery module 103 and The automatic switching device 101 is electrically connected, and the outer surface of the structural support is provided with a power interface 105, and the battery module 103 is electrically connected with other battery modules and high-voltage control devices through the power interface 105, and the automatic switching device 101. The output terminals of the total positive and total negative poles of the battery module are connected with cables and copper-aluminum bars, and the automatic switching device 101 is connected in series in the circuit of the cables and copper-aluminum bars. To switch on and off the high-voltage output of the group, the battery management unit 102 is electrically connected to the battery main control unit through the battery management system interface 106 located outside the energy storage battery module, and two switches are arranged in the automatic switching device 101, which are used as normal output switches and The fault output switches are all connected to the energy storage system through the battery management unit 102 for unified control. According to different application scenarios, the switch can use electromagnetic relays, solid state relays, complementary metal oxide semiconductors, and insulated gate bipolar transistors. Due to performance limitations, complementary metal oxide semiconductors are only suitable for low voltage (below 200V) , small current (below 100A) application scenarios; electromagnetic relays, solid state relays, and insulated gate bipolar transistors have a wider range of applications. In addition to low voltage, low current scenarios, they can also be applied to high voltage, high current application scenarios middle.

The energy storage system is composed of an energy storage battery module as a storage carrier, a battery management system, a central control system, and an energy management system. The battery master control unit is a part of the central control system. The control system itself is not the improvement point of the present utility model, so it will not be described in detail here.

Example 2

In this embodiment, the energy storage battery module using the automatic cutting device operates as follows:

Referring to Figure 3, when the energy storage battery module is working normally and has no faults, keep the normal output switch K1 closed and the fault output switch K2 open, at this time the battery cluster circuit normally outputs high voltage.

The battery management system generally divides the faults of the battery system into three levels: slight, general, and serious. When the battery module temperature, module voltage, single temperature difference, single When exceeding the standard or seriously exceeding the standard, it means that the energy storage battery module has a minor, general or serious fault. When a minor or general fault occurs in the energy storage battery module, taking the module temperature > 50°C as an example, the battery management unit 102 will report the fault signal to the battery management system, and the battery management system will only report and alarm the fault At the same time, it requests the battery management system to reduce power, prohibit charging and prohibit operation, but still ensure the complete operation of the energy storage system.

When serious faults such as loss of temperature and voltage signals, hardware failures, communication failures, and circuit breaks occur in the energy storage battery module, the battery management unit 102 reports the fault signal to the battery main control unit in the battery management system, and at the same time requests automatic cut off. After receiving the fault signal, the battery main control unit issues a switching command and reports the fault information and updates the power status to the energy storage system. The battery management unit 102 starts to execute after receiving the switching command. At this time, the battery management unit 102 will first turn off the normal output switch K1, then close the fault output switch K2 and keep it on. At this time, the battery in the battery module is disconnected, and the power interface For positive and negative direct connection mode.

When a serious fault occurs in the energy storage battery module and the battery management unit 102 has not received the command feedback from the battery main control unit after more than 1-5 seconds, the battery management unit 102 will automatically perform switching.

When a serious level of fault occurs in the energy storage battery module and the fault is eliminated by itself, the battery management unit 102 reports a fault elimination signal to the battery management system and requests reintegration. At this time, the battery management system , when it is determined that the state is consistent with other normal battery modules, it will issue a merge command. After receiving the merge command, the battery management unit 102 will first open the fault output switch K2, then close the normal output switch K1 and keep it on, and complete the re-merge. enter.

Example 3

The present embodiment is an energy storage battery cluster suitable for this device, and its composition is as follows:

Several energy storage battery modules provided in Embodiment 1 and provided with this device are connected in series to form an energy storage battery cluster as shown in FIG. 4 .

The battery cluster also includes a starter switch KQ and a fuse. The start switch KQ is connected in series to the busbar of the battery cluster, and the connection state of the entire battery cluster can be changed by controlling the closing of the start switch KQ; the series busbar of the battery module is connected in series with the fuse to output direct current, and the fuse can be used in the prior art. The existing fuse is realized, and the short circuit and overcurrent protection can be carried out through the fuse.

When serious faults such as loss of temperature and voltage signals, hardware faults, communication faults, and circuit breaks occur in a certain energy storage battery module, the fault signal is reported to the battery main control unit through the battery management unit 102 in the battery module, and the battery The main control unit issues a switching command after receiving the fault signal, and the battery management unit 102 starts to execute the switching command after receiving the switching command. At this time, the battery management unit 102 will first turn off the normal output switch K1, and then close the fault output switch K2 and keep it on. The battery in the battery module is disconnected, and the power interface is in the positive and negative direct connection mode. The entire battery cluster system continues to operate in the state of (n-1) battery modules, reducing the adverse effects of failures.

Claims (10)

1. An automatic energy storage battery fault module cutting device, comprising:

the bottom surface may be used to fix a structural support of the battery module,

a battery management unit secured to a side of the structural support,

an automatic switching device capable of being electrically connected with the battery module and the battery management unit,

the power interface is arranged on the side face of the structural support piece, and can realize that the battery module fixed on the bottom face of the structural support piece is electrically connected with other battery modules and the high-voltage control device;

the battery management unit is electrically connected with a battery main control unit positioned outside through the battery management system interface.

2. The device as claimed in claim 1, wherein the battery module is formed by connecting a plurality of lithium battery cells in series or in parallel.

3. The apparatus of claim 1, wherein two switches are provided in the automatic switching apparatus, respectively as a normal output switch and a fault output switch.

4. The apparatus of claim 3, wherein the switch is connected to the battery master control unit through a battery management unit.

5. The apparatus of claim 3, wherein the switch is selected from any one of an electromagnetic relay, a solid state relay, a complementary metal oxide semiconductor, and an insulated gate bipolar transistor.

6. The device as claimed in claim 1, wherein the automatic switching device is connected with the battery module through a cable and a copper aluminum bar to form a loop, and is connected with the battery management unit through a circuit to form a control loop.

7. A battery module, characterized in that the battery module comprises an automatic cutting device for the energy storage battery failure module according to any one of claims 1-6, and a battery module arranged on the bottom surface of the automatic cutting device.

8. A battery cluster characterized in that the battery modules according to claim 7 are connected in series.

9. A battery management system, wherein the battery management system monitors and manages:

the battery module of claim 7 or the battery cluster of claim 8.

10. An energy storage system, characterized in that the energy storage system uses the battery module of claim 7 as a storage carrier, and is formed together with an energy management system, a central control system and the battery management system of claim 9, wherein the central control system comprises the battery master control unit of claim 1.

Images