Energy storage direct current cabin battery cluster for testing and energy storage system

Abstract

The utility model provides an energy storage direct current cabin battery cluster for testing and an energy storage system. The energy storage direct current cabin battery cluster comprises a positive line, a negative line, and a battery module and a test protection module which are arranged between the positive line and the negative line, the battery module comprises a first battery pack and a second battery pack, the positive end of the first battery pack is connected to the positive circuit, and the negative end of the second battery pack is connected to the negative circuit; the test protection module comprises a normally-open relay, a switch unit and a power supply unit, one end of a group of normally-open contacts of the normally-open relay is connected with the negative electrode end of the first battery pack, the other end of the normally-open contacts is connected with the positive electrode end of the second battery pack through a fuse, and a relay coil of the normally-open relay, the switch unit and the power supply unit form a loop; and the switch unit is used for electrifying the relay coil during closing so as to close the normally open contact. And by integrating the test protection module, the test safety of the battery cluster and the direct current cabin is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to an energy storage direct current battery cluster for testing and an energy storage system. BACKGROUND

[0002] The existing energy storage direct current battery cluster is usually composed of a plurality of battery packs in series or parallel connection. With the increase of the number of battery packs in series connection, the voltage of the battery cluster also increases, usually reaching several hundred volts to two or three thousand volts. The wiring for testing the battery cluster and the direct current warehouse is performed by professional operators. The foolproof measures are mainly in the form of color or key position. Even so, the positive and negative poles are often connected in reverse. Once the positive and negative poles are connected in reverse, it may cause electric shock injury, battery fire and explosion. In other words, the connectors are easy to form a loop during the series connection process, leading to high-voltage short circuit and poor safety of the operators.

[0003] Therefore, the present application provides an energy storage direct current battery cluster for testing to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to solve the problem of poor safety of the operators when connecting the wires of the energy storage direct current battery cluster for testing in the related art.

[0005] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0006] The present application provides an energy storage direct current battery cluster for testing and an energy storage system, comprising: a positive line, a negative line, and a battery module and a test protection module arranged between the positive line and the negative line;

[0007] The battery module comprises a first battery pack and a second battery pack. The positive terminal of the first battery pack is connected to the positive line, and the negative terminal of the second battery pack is connected to the negative line.

[0008] The test protection module comprises a normally open relay, a switch unit and a power supply unit. One end of a group of normally open contacts of the normally open relay is connected to the negative terminal of the first battery pack, and the other end is connected to the positive terminal of the second battery pack. The relay coil of the normally open relay forms a loop with the switch unit and the power supply unit. The switch unit is used to close the relay coil to make the normally open contact closed.

[0009] The beneficial effects of the technical solution are that by setting the test protection module between the battery packs for testing, the operator can perform plug-in connection in a safer environment, reducing the risk of electric shock and short circuit to the operator. The switch unit can be set away from the battery pack, in which case the operator can close or open the circuit by remotely controlling the switch unit, avoiding direct contact with high-voltage circuits and improving the convenience and safety of operation.

[0010] In summary, by integrating the test protection module, not only the safety of the battery cluster and DC bin testing is improved, but also the convenience of remote control is provided, reducing potential damage.

[0011] In some possible implementations, a fuse is further arranged between the normally open contact of the normally open relay and the positive terminal of the second battery pack.

[0012] The beneficial effects of the technical solution are that by setting the test protection module between the battery packs, the power supply can be quickly cut off when the current abnormally rises, protecting the safety of the operator and the equipment. The presence of the fuse can prevent short circuit and overload caused by wiring errors or unexpected situations during testing, reducing the risk of fire and equipment damage. During testing, if a short circuit or other abnormal situation occurs, the automatic cutting function of the fuse can protect the battery cluster from damage, ensuring the continuity and reliability of the test. By remotely controlling the switch unit to close or open the circuit, the operator can avoid direct contact with high-voltage circuits, simplifying the operation process and improving work efficiency. Since the fuse can quickly respond to overcurrent conditions, it reduces the damage to equipment caused by overcurrent, thereby reducing maintenance costs and downtime. It is worth noting that the fuse in this embodiment is not set at the negative terminal of the first battery pack.

[0013] In summary, by integrating the test protection module in the battery cluster, especially by setting the fuse, not only the safety of the operation and the reliability of the test are improved, but also the convenience of remote control is provided while reducing potential damage through an automatic protection mechanism.

[0014] In some possible implementations, the switch unit is a push-button switch, and the fuse is an adjustable fuse.

[0015] The button switch provides a simple and intuitive operation mode, allowing the operator to easily control the power connection and disconnection of the battery cluster. By controlling the on-off of the circuit through the button switch, the operator can operate from a safe distance, reducing the risk of direct contact with high-voltage circuits. The adjustable fuse allows the adjustment of the fuse current according to the specific needs and conditions of the battery cluster, accurately setting the protection level, providing higher flexibility and adaptability. At the same time, the button switch and adjustable fuse are generally easy to maintain and replace, which helps to reduce long-term operating costs. In summary, by using the button switch and adjustable fuse, the operation is simple and safe.

[0016] In some possible implementations, the button switch is a self-locking button switch, and a set of normally open contacts of the self-locking button switch is used to control the power-on and power-off of the relay coil.

[0017] The self-locking button switch provides a convenient operation mode, and the user only needs to press once to realize the closing or opening of the circuit without the need for continuous pressing. By using the self-locking button switch, the operator can control the high-voltage circuit from a safe distance, reducing the risk of electric shock.

[0018] In some possible implementations, the switch unit is a smart switch that integrates a microprocessor and a Bluetooth communicator for connection with a user device to realize switch control of the smart switch.

[0019] The user can establish a Bluetooth connection with the smart switch through a special application on a smart device such as a smartphone or tablet. Once the connection is established, the operator can send instructions through the application to control the on-off state of the smart switch. At the same time, the smart switch can feedback to the user device whether it is currently closed.

[0020] In some possible implementations, the first battery pack and the second battery pack each include a plurality of series-connected battery groups, the number of battery groups in each battery pack ranges from not less than 3 to not more than 8, and the model of each battery group is the same.

[0021] The battery pack can provide higher voltage by connecting the battery packs in series, meeting the testing application in high-voltage demand environment. Since the battery packs in the two battery packs are of the same model, the unified management and maintenance of the batteries are simplified, and the complexity of spare parts and replacement is reduced. The series-connected battery packs can balance the load and reduce the risk of damage of individual battery packs due to overload, thereby improving the reliability of the entire battery pack. The design of the battery pack allows the number of battery packs to be increased or decreased as needed to adapt to the voltage and energy demand under different demand tests. Since the battery packs are of the same model, it is easier to implement a battery management system (BMS) to monitor and manage the battery status including voltage, current, temperature, and state of charge.

[0022] In some possible implementations, the specifications of the battery packs are 0.5P / 332.8V.

[0023] In some possible implementations, the power supply unit is a switching power supply unit, and the input voltage of the switching power supply unit is 220VAC and the output voltage is 24VDC.

[0024] The switching power supply unit has higher conversion efficiency and generates less heat and lower energy loss during conversion than traditional linear power supply units. The switching power supply unit can provide stable output voltage even under input voltage fluctuations or load changes, improving the stability of the test.

[0025] In some possible implementations, the specifications of the fuse are any one of 350V / 400A, 350V / 350A, or 350V / 320A.

[0026] The provision of fuse options with different rated currents allows designers to select appropriate fuses according to the current demand of the actual circuit to ensure optimal protection.

[0027] The application also provides an energy storage system comprising the energy storage direct current warehouse battery cluster of any one of the above and an energy storage inverter connected thereto. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be further described below in conjunction with the drawings and examples.

[0029] Fig. 1 A structural block diagram of an energy storage direct current warehouse battery cluster for testing is proposed for the application;

[0030] Fig. 2 A structural schematic diagram of an energy storage direct current warehouse battery cluster for testing is proposed for the application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0032] Referring to Figs. 1-2 The energy storage DC battery cluster for testing provided by the embodiments of the present application comprises a positive line, a negative line, and a battery module and a test protection module arranged between the positive line and the negative line.

[0033] The battery module comprises a first battery pack and a second battery pack, and the positive terminal of the first battery pack is connected to the positive line, and the negative terminal of the second battery pack is connected to the negative line.

[0034] The test protection module comprises a normally open relay, a switch unit and a power supply unit, one end of a set of normally open contacts of the normally open relay is connected to the negative terminal of the first battery pack, and the other end is connected to the positive terminal of the second battery pack, and the relay coil of the normally open relay forms a loop with the switch unit and the power supply unit, and the switch unit is used to close the relay coil to make the normally open contact closed.

[0035] It can be understood that the connection in the embodiments of the present application refers to electrical connection, including direct connection, such as direct connection through a wire, and indirect connection, such as indirect connection through a fuse. The test of the energy storage DC battery cluster can refer to battery performance test to test the capacity, voltage, internal resistance and other key parameters of the battery, to evaluate the performance and health status of the battery. Or electrical parameter test, to measure the voltage, current, power and other electrical parameters of the battery cluster to ensure that it meets the design specifications. Or cycle life test, to test the life by repeating the charge and discharge cycles to evaluate the reliability of long-term use. The positive line and the negative line refer to two conductive paths in the DC circuit of the battery cluster, corresponding to the positive and negative connection lines of the battery cluster respectively.

[0036] The battery module is composed of a first battery pack and a second battery pack, wherein the positive terminal of the first battery pack is connected to the positive line, and the negative terminal of the second battery pack is connected to the negative line, so that the two groups of battery packs are connected in series in the circuit for testing. The test protection module comprises a normally open relay, a switch unit and a power supply unit. One end of a set of normally open contacts of the normally open relay is connected to the negative terminal of the first battery pack, and the other end is connected to the positive terminal of the second battery pack. When the relay is not powered, the two contacts are open, preventing current from flowing directly from the first battery pack to the second battery pack. The relay coil forms a control loop with the switch unit and the power supply unit. When the switch unit is closed, the circuit is completed, the relay coil is powered, and the normally open contact is closed, thereby allowing current to flow from the first battery pack to the second battery pack.

[0037] When performing the battery cluster and DC bin related tests, the operator first ensures that the switch unit is in the open state to ensure that the relay coil is not powered, and the normally open contact remains open to ensure safety. After the operator connects the test equipment and the circuit, the switch unit is closed, the relay coil is powered, the normally open contact is closed, and the current begins to flow, allowing the test signal or current to pass through the battery cluster. In this way, the first battery pack and the second battery pack are not connected in series, and even if the positive and negative terminals are reversed, the risk of electrical shock and short circuit to the operator during the connection process is avoided.

[0038] Thus, by providing a test protection module between the battery packs for testing, the operator can perform the plug-in connection in a safer environment, reducing the risk of electrical shock and short circuit to the operator. The switch unit can be provided remotely from the battery pack, in which case the operator can close or open the circuit by remotely controlling the switch unit, avoiding direct contact with the high-voltage circuit and improving the convenience and safety of the operation.

[0039] In summary, by integrating the test protection module, not only is the safety of the battery cluster and DC bin testing improved, but the convenience of remote control is also provided.

[0040] In one embodiment, a fuse is further provided between the normally open contact of the normally open relay and the positive terminal of the second battery pack.

[0041] In this case, the test protection module includes a normally open relay, a switch unit, a power supply unit, and a fuse. The fuse is provided between the normally open contact of the normally open relay and the positive terminal of the second battery pack as an overcurrent protection device. When the current exceeds the rated value of the fuse, the fuse will automatically melt, cutting off the current and preventing circuit overload and short circuit.

[0042] Thus, by providing a test protection module between the battery packs, the power supply can be quickly cut off when the current abnormally rises, protecting the operator and the equipment. The presence of the fuse can prevent short circuits and overloads due to wiring errors or unexpected situations during testing, reducing the risk of fire and equipment damage. In the event of a short circuit or other abnormal situation during testing, the automatic cutting function of the fuse can protect the battery cluster from damage, ensuring the continuity and reliability of the test. By remotely controlling the switch unit to close or open the circuit, the operator can avoid direct contact with the high-voltage circuit, simplifying the operation process and improving work efficiency. Since the fuse can quickly respond to overcurrent situations, the risk of equipment damage due to overcurrent is reduced, thereby reducing maintenance costs and downtime. It is worth noting that the fuse in this embodiment is not provided at the negative terminal of the first battery pack.

[0043] In summary, the technical solution integrates a test protection module in the battery cluster, especially a fuse, which not only improves the safety of operation and the reliability of testing, but also reduces potential damage through an automatic protection mechanism while providing the convenience of remote control.

[0044] In one embodiment, the switch unit is a push button switch, and the fuse is an adjustable fuse.

[0045] The push button switch has two states: pressed (closed) and released (open), used to control the on-off of the circuit. When the operator presses the button, the switch is closed, and the current can flow through the coil of the normally open relay, magnetizing it and closing its normally open contacts, thereby connecting the negative terminal of the first battery pack and the positive terminal of the second battery pack, allowing current to flow in the battery cluster. When the operator releases the button, the switch is open, and the relay coil loses current, and the normally open contacts of the relay return to the open state, cutting off the current flow.

[0046] The adjustable fuse is a fuse that can adjust its fuse current as needed, allowing the operator to set the trigger current of the fuse according to the specific needs of the energy storage DC battery cluster. It is set between the normally open contacts of the normally open relay and the positive terminal of the second battery pack. When the current exceeds the set fuse current, the fuse will melt, cutting off the current, protecting the circuit from overload and short circuit damage.

[0047] In this way, the push button switch provides a simple and intuitive operation method, allowing the operator to easily control the power connection and disconnection of the battery cluster. By controlling the on-off of the circuit through the push button switch, the operator can operate at a safe distance, reducing the risk of direct contact with high-voltage circuits. The adjustable fuse allows the fuse current to be adjusted according to the specific needs and conditions of the battery cluster, accurately setting the protection level, providing higher flexibility and adaptability. At the same time, the push button switch and adjustable fuse are usually easy to maintain and replace, which helps to reduce long-term operating costs. In summary, by using the push button switch and adjustable fuse, the operation is simple and safe.

[0048] In another embodiment, the switch unit is a smart switch that integrates a microprocessor and a Bluetooth communicator, allowing connection with user devices such as smartphones to control the switch.

[0049] The user can establish a Bluetooth connection with the smart switch through a dedicated application on a smart device such as a smartphone or tablet. Once the connection is established, the operator can send instructions through the application to control the on-off state of the smart switch. At the same time, the smart switch can feedback to the user device whether its current state is closed.

[0050] In one embodiment, the push button switch is a self-locking push button switch, and a set of normally open contacts of the self-locking push button switch is used to control the energization and de-energization of the relay coil.

[0051] The self-locking push button switch is a switch that can automatically maintain its state after being pressed down, without the need for continuous pressing to maintain the closure or opening of the circuit. A set of normally open contacts is used to control the energization and de-energization of the relay coil. The normally open contacts are open when the button is not pressed, and when the button is pressed and locked, the contacts are closed, allowing current to flow through the relay coil.

[0052] In this way, the self-locking push button switch provides a convenient operation mode, and the user only needs to press once to realize the closure or opening of the circuit, without the need for continuous pressing. By using the self-locking push button switch, the operator can control the high-voltage circuit from a safe distance, reducing the risk of electric shock.

[0053] In specific applications, the self-locking push button switch can also include a lamp bead for prompting the working state of the push button switch, which emits a red light when the circuit is closed.

[0054] In one embodiment, the first battery pack and the second battery pack each include a plurality of battery groups connected in series, the number of battery groups in each battery pack ranges from not less than 3 to not more than 8, and the model of each battery group is the same. The specification of the battery group is 0.5P / 332.8V, and it can also be 1P104S-LFP-liquid cooling.

[0055] The first battery pack and the second battery pack are each composed of a plurality of battery groups of the same model connected in series. Each battery group contains a number of battery groups, which are connected in series to increase the voltage of the overall battery pack. In the series configuration, the current is the same in all battery groups, while the total voltage is the sum of the voltages of each battery group, allowing the battery pack to provide higher voltage, suitable for applications requiring high voltage input.

[0056] In this way, by connecting the battery groups in series, the battery pack can provide higher voltage to meet the testing application in the high-voltage demand environment. Since the battery groups in the two battery packs are of the same model, the unified management and maintenance of the batteries are simplified, and the complexity of spare parts and replacement is reduced. The series-connected battery groups can balance the load and reduce the risk of damage to individual battery groups due to overload, thereby improving the reliability of the entire battery pack. The design of the battery pack allows the number of battery groups to be increased or decreased as needed to adapt to the voltage and energy requirements under different demand tests. Since the battery groups are of the same model, it is easier to implement a battery management system (BMS) to monitor and manage the battery status including voltage, current, temperature, and state of charge.

[0057] In one embodiment, the power supply unit is a switching power supply unit, and the input voltage of the switching power supply unit is 220VAC and the output voltage is 24VDC.

[0058] The main function of the switching power supply unit is to convert alternating current (AC) to direct current (DC). The input 220VAC AC power is first converted to pulsating DC power by a rectifier (such as a diode bridge), which converts the positive and negative cycles of AC power to a single direction current. The rectified pulsating DC power is smoothed by a filter (such as a capacitor) to reduce voltage fluctuations and ripples. The filtered DC power enters the switching circuit, which uses high-frequency switching elements (such as MOSFET or IGBT) and PWM controllers to adjust the voltage to the required 24VDC output. The output voltage is regulated by a voltage feedback and error amplifier to ensure the stability of the output voltage.

[0059] As a result, the switching power supply unit has higher conversion efficiency and generates less heat and lower energy loss compared to traditional linear power supply units. The switching power supply unit can provide stable output voltage even in the case of input voltage fluctuations or load changes, improving the stability of the test.

[0060] In one embodiment, the fuse has a specification of any one of 350V / 400A, 350V / 350A, or 350V / 320A.

[0061] Providing fuse options with different current ratings (400A, 350A, 320A) allows designers to select the appropriate fuse based on the actual current requirements of the circuit, ensuring optimal protection.

[0062] As an example, refer to Fig. 2 The energy storage DC battery cluster includes a positive line, a negative line, and a battery module and a test protection module arranged between the positive line and the negative line.

[0063] The first battery pack and the second battery pack are connected to the positive line (total positive) and the negative line (total negative), respectively. The first battery pack includes a 1# battery group, a 2# battery group, and a 3# battery group. The second battery pack includes a 4# battery group, a 5# battery group, and an N# battery group. N is a positive integer not less than 6. The positive and negative electrodes of each battery group are connected end to end (B+ is the positive electrode and B- is the negative electrode). The test protection module includes a normally open relay 1, a switch unit 3, a power supply unit 4, and a fuse 2.

[0064] For the wire series process, personnel visual fatigue, color recognition error, easy to cause wrong connection, resulting in high voltage short circuit, personnel casualties or fire, explosion. And wire series process, connector is easy to connect into a loop, resulting in high voltage short circuit, personnel casualties. The battery cluster provided in the example for testing is set between the battery packs and the test protection module for control on-off, so that the operating personnel are in a completely environment when wiring, thereby effectively reducing the risk of electric shock, injury and risk of personnel. After the test protection module is connected, the strong electricity is controlled by the weak electricity, if the positive and negative poles are connected reversely, the safety device first breaks the fuse, and then protects the battery pack, battery cluster and direct current warehouse, so that the life safety and property are effectively protected.

[0065] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to represent an example, illustration or description. Any implementation or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other implementation or design scheme. In fact, the words such as "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0066] In the embodiments of the present application, the first, second and the like are only used for description and distinction of the description objects, and there is no order difference, nor does it represent a special limitation on the quantity in the embodiments of the present application, and cannot constitute any limitation on the embodiments of the present application.

[0067] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone, wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c, can represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b and c can be single or multiple. It should be noted that "at least one" can also be interpreted as "one or more".

[0068] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change according to the technical scheme and application concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An energy storage DC bank battery cluster for testing, characterized by, The application relates to a battery cluster. The battery cluster comprises a positive line, a negative line, a battery module and a test protection module arranged between the positive line and the negative line. The battery module comprises a first battery pack and a second battery pack, a positive terminal of the first battery pack is connected to the positive line, and a negative terminal of the second battery pack is connected to the negative line. The test protection module comprises a normally open relay, a switch unit and a power supply unit, one end of a set of normally open contacts of the normally open relay is connected to a negative terminal of the first battery pack, the other end of the set of normally open contacts is connected to a positive terminal of the second battery pack, a relay coil of the normally open relay forms a loop with the switch unit and the power supply unit, and the switch unit is used to close the relay coil to make the normally open contacts closed.

2. The energy storage DC bank battery cluster of claim 1, wherein, A fuse is arranged between the normally open contacts of the normally open relay and the positive terminal of the second battery pack.

3. The energy storage DC bank battery cluster of claim 2, wherein, The switch unit is a button switch, and the fuse is an adjustable fuse.

4. The energy storage DC bank battery cluster of claim 3, wherein, The button switch is a self-locking button switch, and a set of normally open contacts of the self-locking button switch is used to control the power-on and power-off of the relay coil.

5. The energy storage DC bank battery cluster of claim 2, wherein, The fuse has any one of specifications of 350V / 400A, 350V / 350A or 350V / 320A.

6. The energy storage DC bank battery cluster of claim 1, wherein, The first battery pack and the second battery pack each comprise a plurality of battery groups in series, the number of the battery groups in each battery pack ranges from not less than 3 to not more than 8, and the battery groups are of the same model.

7. The energy storage DC bank battery cluster of claim 6, wherein, The battery group has a specification of 0.5P / 332.8V.

8. The energy storage DC bank battery cluster of claim 1, wherein, The power supply unit is a switching power supply unit, the input voltage of the switching power supply unit is 220VAC, and the output voltage is 24VDC.

9. An energy storage system characterized by, The application further relates to a storage energy direct current battery cluster and a storage energy inverter connected to the storage energy direct current battery cluster.

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