Temperature control standby power supply and system of power distribution network

Abstract

The utility model discloses a temperature control standby power supply and system of a power distribution network, the temperature control standby power supply of the power distribution network comprises a battery shell and a plurality of groups of lithium battery modules arranged in the battery shell, and immersed refrigerants are filled among the plurality of lithium battery modules. A heating module is arranged between the first surface in the battery shell and the lithium battery module, a first temperature sensing unit is arranged between the second surface in the battery shell and the lithium battery module, the first surface in the battery shell is opposite to the second surface, and a second temperature sensing unit is arranged along the height direction of the lithium battery module. When the standby power supply is started, the lithium battery module can be preheated, and the internal resistance of the battery is reduced, so that the voltage difference of cold start is reduced, the low-voltage protection of the battery is prevented from being triggered, and the stable operation of related equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy storage, and in particular to a temperature-controlled backup power supply and system for a distribution network. Background Art

[0002] In the distribution network, submerged batteries are widely used in various power grid equipment, such as distribution transformers, reactive power compensation devices, etc.

[0003] When existing submerged backup batteries are started up, the sudden inrush current from the equipment can cause a sudden drop in battery voltage, which can easily trigger the battery's low-voltage protection mechanism. Once the low-voltage protection mechanism is triggered, the battery will experience a power failure, affecting the normal operation of the entire backup power system. The battery will not be able to perform its backup function at critical moments, posing a risk to the continued operation of related equipment. Utility Model Content

[0004] In view of this, the purpose of the embodiments of the present invention is to provide a temperature-controlled backup power supply and system for a distribution network, which can effectively avoid low-voltage protection failures when the backup power supply is started, thereby ensuring the stable operation of related equipment.

[0005] In the first aspect, an embodiment of the present invention provides a temperature-controlled backup power supply for a distribution network, comprising a battery housing and multiple groups of lithium battery modules arranged in the battery housing, wherein immersion refrigerant is filled between the multiple lithium battery modules, a heating module is arranged between the first surface in the battery housing and the lithium battery module, a first temperature sensing unit is arranged between the second surface in the battery housing and the lithium battery module, the first surface in the battery housing is opposite to the second surface, and a second temperature sensing unit is arranged along the height direction of the lithium battery module.

[0006] Optionally, at least one pair of magnetic field generators is further provided on the battery housing, and the pair of magnetic field generators are relatively arranged on the first surface and the second surface of the battery housing, and the immersion refrigerant includes vegetable oil and magnetic nanoparticles.

[0007] Optionally, guide plates are provided between adjacent lithium battery modules, and the guide plates are provided along the height direction of the lithium battery modules.

[0008] Optionally, a heat insulation plate is provided in the middle of the guide plate.

[0009] Optionally, a groove frame is further provided between the battery housing and the lithium battery module, the groove frame including a first support plate, a second support plate and a support rod, the first support plate is in close contact with the battery housing or the heating module, the second support plate is in close contact with the lithium battery module, and the support rod is used to connect the first support plate and the second support plate.

[0010] Optionally, the first temperature sensing unit is arranged on the groove frame between the second surface inside the battery shell and the lithium battery module, and the second support plate in contact with the upper surface of the lithium battery module is configured as a battery protection plate, and the upper surface of the lithium battery module is opposite to the second surface inside the battery shell.

[0011] Optionally, the first end of the battery protection board is respectively connected to the first positive electrode interface and the first negative electrode interface of the plurality of lithium battery modules, and the second end of the battery protection board is respectively connected to the second positive electrode interface and the second negative electrode interface on the battery casing.

[0012] Optionally, the battery housing is further provided with a breathing valve and an explosion-proof valve.

[0013] Optionally, the first temperature sensing unit includes a temperature sensing circuit, which includes a first resistor, a second resistor, a third resistor, a thermistor, an operational amplifier and a first field-effect transistor, wherein the first end of the first resistor and the first end of the second resistor are both connected to a DC power supply, the second end of the first resistor and the first end of the thermistor are both connected to the positive port of the operational amplifier, the second end of the second resistor and the first end of the third resistor are both connected to the negative port of the operational amplifier, the second end of the third resistor and the second end of the thermistor are both grounded, the output interface of the operational amplifier is connected to the second port of the first field-effect transistor, the third port of the first field-effect transistor is grounded, and the first port of the first field-effect transistor is connected to the DC power supply.

[0014] In a second aspect, an embodiment of the present invention provides a temperature-controlled backup power supply system for a distribution network, including the above-mentioned temperature-controlled backup power supply for the distribution network.

[0015] The implementation of the embodiments of the present invention includes the following beneficial effects: The embodiments of the present invention provide a temperature-controlled backup power supply for a distribution network, including: a battery housing and multiple groups of lithium battery modules arranged in the battery housing, immersion refrigerant is filled between the multiple lithium battery modules, a heating module is arranged between the first surface in the battery housing and the lithium battery module, a first temperature sensing unit is arranged between the second surface in the battery housing and the lithium battery module, the first surface in the battery housing is opposite to the second surface, and a second temperature sensing unit is arranged along the height direction of the lithium battery module. The temperature of the refrigerant above the lithium battery module is detected by the first temperature sensing unit, and heated by the heating module. When the temperature of the refrigerant above the lithium battery module reaches the preset temperature, the temperature of other areas also reaches the preset temperature, thereby avoiding frequent startup of the heating module or inaccurate heating. At the same time, the second temperature sensing unit can detect the temperature in the height direction of the battery module, thereby avoiding local high temperature damage to the lithium battery module. Therefore, the present application can preheat its lithium battery module when the backup power supply is enabled, reduce the internal resistance of the battery, thereby reducing the pressure difference during cold start, avoiding triggering the battery low voltage protection, and ensuring the stable operation of related equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a temperature-controlled backup power supply for a distribution network provided by an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the valve and interface of the backup power supply provided by the embodiment of the utility model;

[0018] Figure 3 This is a circuit diagram of a battery protection board provided by an embodiment of the present utility model;

[0019] Figure 4 This is a circuit schematic diagram of the first temperature sensing unit provided in an embodiment of the present utility model.

[0020] Reference numerals: battery housing 100 , magnetic field generator 110 , explosion-proof valve 120 , breathing valve 130 , second positive electrode interface 140 , second negative electrode interface 150 ;

[0021] A first support plate 200, a second support plate 210, and a support rod 220;

[0022] Lithium battery module 300, guide plate 310, heat insulation plate 320;

[0023] Heating module 400;

[0024] Battery protection board 500 and first temperature sensing unit 510 . DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0027] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, unless otherwise specified, "plurality" means two or more.

[0028] Reference Figure 1-4 An embodiment of the present invention provides a temperature-controlled backup power supply for a power distribution network, including a battery housing 100 and a plurality of lithium battery modules 300 arranged in the battery housing 100, wherein an immersion refrigerant is filled between the plurality of lithium battery modules 300, a heating module 400 is arranged between a first surface in the battery housing 100 and the lithium battery module 300, and a first temperature sensing unit 510 is arranged between a second surface in the battery housing 100 and the lithium battery module 300, the first surface and the second surface in the battery housing 100 are opposite to each other, and a second temperature sensing unit is arranged along the height direction of the lithium battery module 300.

[0029] Specifically, the backup power supply includes multiple lithium battery modules 300, a heating module 400, an immersion refrigerant, and a housing. Each lithium battery module 300 is composed of multiple lithium iron phosphate cells connected in series, tightly grouped side by side and separated by insulating pads. The immersion refrigerant is filled between the lithium battery modules 300, transferring heat between the modules 300 and ensuring temperature uniformity throughout the backup power supply. When the first sensor unit is required to detect that the temperature of the immersion refrigerant above the lithium battery module 300 (i.e., the space between the second surface in the battery housing 100 and the lithium battery module 300) is lower than a preset temperature (e.g., 15 degrees Celsius), the heating module 400 is driven to heat the immersion refrigerant below the lithium battery module 300 (i.e., the space between the first surface in the battery housing 100 and the lithium battery module 300). The immersion refrigerant transfers heat from bottom to top. When the first sensor unit detects that the temperature of the immersion refrigerant above the lithium battery module 300 reaches the preset temperature, other parts also reach the preset temperature. If the first temperature sensing unit 510 is set in other areas, the temperature of other parts may not meet the standard, and the heat exchange in other parts causes the temperature of the immersion refrigerant to drop, thereby repeatedly starting and stopping the heating module 400.

[0030] The second temperature sensing unit is positioned at the height of the lithium battery module 300, specifically in the linear region between the heating module 400 and the first temperature sensing unit 510. This unit is used to detect the temperature difference at the predetermined height difference to determine the corresponding refrigerant temperature difference at each location. If the refrigerant temperature difference is too large, surface heat transfer may become problematic. Continued heating can lead to localized high temperatures that damage the battery, necessitating a reduction in the heating power of the heating module 400. A small temperature difference, however, results in a uniform temperature across the surface, allowing the heating power of the heating module 400 to be appropriately increased. This ensures the backup power supply is at the appropriate temperature upon startup, preventing low-voltage protection failures caused by low battery temperatures.

[0031] Optionally, at least one pair of magnetic field generators 110 is further provided on the battery housing 100 , and the pair of magnetic field generators 110 are relatively arranged on the first surface and the second surface of the battery housing 100 , and the immersion refrigerant includes vegetable oil and magnetic nanoparticles.

[0032] Specifically, magnetic field generators 110 can be positioned on opposite sides of the battery housing 100. Specifically, multiple pairs of magnetic field generators 110 can be provided to control the magnetic field strength and direction in different regions within the lithium battery. By adding a suitable concentration of magnetic nanoparticles (such as ferroferric oxide magnetic nanoparticles) to the vegetable oil, the resulting immersion refrigerant becomes magnetic, enabling it to be driven by a magnetic field. Magnetic field generators 110 generate an alternating magnetic field, driving the directional movement of the magnetic nanoparticles and the formation of controlled convection within the immersion refrigerant. This balances the immersion refrigerant temperature throughout the lithium battery module 300 and ensures stable lithium battery temperature.

[0033] Optionally, a guide plate 310 is provided between adjacent lithium battery modules 300 , and the guide plate 310 is provided along the height direction of the lithium battery modules 300 .

[0034] Specifically, the guide plates 310 guide the fluid through the gaps between the lithium battery modules 300, forming a serpentine flow path. This enhances heat transfer efficiency, balances temperature differences, and prevents heat accumulation in localized areas that could damage the lithium battery modules 300. An array of guide plates 310 (multiple guide plates 310) is arranged along the arrangement of the lithium battery modules 300. The shape, size, and spacing of the guide plates 310 are designed as needed to guide the immersion refrigerant along a specific path and enhance heat exchange efficiency between the lithium battery modules 300.

[0035] Optionally, a heat insulation plate 320 is provided in the middle of the guide plate 310 .

[0036] Specifically, by arranging a heat insulation plate 320 in the middle of the guide plate 310, the heat transferred to other lithium battery modules 300 when a single lithium battery module 300 experiences thermal runaway can be reduced, while the temperature difference of the thermal runaway lithium battery module 300 can be balanced by immersing the refrigerant.

[0037] Optionally, a ribbed frame is further provided between the battery housing 100 and the lithium battery module 300, and the ribbed frame includes a first support plate 200, a second support plate 210 and a support rod 220, the first support plate 200 is in close contact with the battery housing 100 or the heating module 400, the second support plate 210 is in close contact with the lithium battery module 300, and the support rod 220 is used to connect the first support plate 200 and the second support plate 210.

[0038] Specifically, the ribbed frame is placed between the battery housing and the lithium battery module 300 to secure the battery module 300 and accelerate heat conduction. The ribbed frame specifically includes a first support plate 200, a second support plate 210, and a support rod 220. The first support plate 200 is in close contact with the battery housing 100 or the heating module 400 (the heating module 400 is positioned between the battery housing 100 and the first support plate 200, and the heating module 400 heats the first support plate, thereby heating the immersion refrigerant). The second support plate 210 is in close contact with the lithium battery module 300, thereby securing the position of the lithium battery module 300. The support rod 220 connects the first support plate 200 and the second support plate 210, ensuring sufficient space between them for the immersion refrigerant to flow.

[0039] Optionally, the first temperature sensing unit 510 is provided on the groove frame between the second surface inside the battery housing 100 and the lithium battery module 300 , and the second support plate 210 in contact with the upper surface of the lithium battery module 300 is configured as a battery protection plate 500 .

[0040] Specifically, the space between the second surface in the battery housing 100 and the lithium battery module 300 is the top of the lithium battery module 300. By setting the first temperature sensing unit 510 above the lithium battery module 300, it is ensured that when the temperature detected by the first temperature sensing unit 510 reaches the preset temperature, other parts also reach the preset temperature. The upper surface of the lithium battery module 300 is provided with the total positive and total negative poles of the lithium battery module 300. By configuring the second support plate 210 as a battery protection plate 500, the current entering and exiting the lithium battery module 300 is controlled by the battery protection plate 500, avoiding problems such as overcharging, over-discharging, overcurrent or overtemperature of the battery, thereby achieving battery protection. In addition, the second support plate 210 on the upper surface of the lithium battery module 300 is configured as a battery protection plate 500, which stabilizes the position of the lithium battery module 300 while also controlling the current entering and exiting the lithium battery module 300.

[0041] Optionally, the first end of the battery protection board 500 is respectively connected to the first positive electrode interface and the first negative electrode interface of the multiple lithium battery modules 300, and the second end of the battery protection board 500 is respectively connected to the second positive electrode interface 140 and the second negative electrode interface 150 on the battery housing 100.

[0042] Specifically, referring to 2-3, the housing is made of high-strength insulating material with excellent airtightness. It is equipped with a second positive electrode port 140 (P2) and a second negative electrode port 150 (P4). These ports are internally connected to the battery protection board 500 and externally connected to the charger and load. The power input of the battery protection board 500 is connected to the first positive electrode port (P1) and the first negative electrode port (P3) of the lithium battery module 300. The power output of the battery protection board 500 is connected to the second positive electrode port 140 (P2) and the second negative electrode port 150 (P4) of the battery housing 100. The sampling line inputs are the cell voltage sampling line and the temperature sampling line. On the battery protection board 500, the first positive electrode port (P1) of the lithium battery module 300 is connected to the second positive electrode port 140 (P2) of the housing. The first negative electrode port (P3) of the lithium battery module 300 is connected to the second negative electrode port 150 (P4) of the housing via two series-connected N-MOS transistors (D2 and D3). The battery protection board 500 controls the conduction and shutdown of the N-MOS transistors based on the cell voltage and temperature, preventing battery overcharge, over-discharge, overcurrent, or overtemperature, thereby protecting the battery. The battery protection board 500 also includes a bidirectional converter UC, which converts AC power from the distribution network into DC power for the lithium battery module 300 and converts DC power output from the lithium battery module 300 into AC power for input into the distribution network.

[0043] Optionally, the battery housing 100 is further provided with a breathing valve 130 and an explosion-proof valve 120 .

[0044] Specifically, a breathing valve 130 and an explosion-proof valve 120 are provided on the outer shell. When the air pressure in the battery box changes slowly, the battery box is inhaled or exhausted through the breathing threshold to keep the internal and external pressures consistent; when the air pressure in the battery box rises rapidly and exceeds the setting (0.3~0.5MPa), it explodes outward through the explosion-proof valve 120.

[0045] In some embodiments, the first temperature sensing unit 510 includes a temperature sensing circuit, which includes a first resistor, a second resistor, a third resistor, a thermistor, an operational amplifier and a first field-effect transistor. The first end of the first resistor and the first end of the second resistor are both connected to a DC power supply, the second end of the first resistor and the first end of the thermistor are both connected to the positive port of the operational amplifier, the second end of the second resistor and the first end of the third resistor are both connected to the negative port of the operational amplifier, the second end of the third resistor and the second end of the thermistor are both grounded, the output interface of the operational amplifier is connected to the second port of the first field-effect transistor, the third port of the first field-effect transistor is grounded, and the first port of the first field-effect transistor is connected to the DC power supply.

[0046] Specifically, refer to Figure 4Thermistor R4 detects the immersion refrigerant temperature above the lithium battery module 300. This immersion refrigerant temperature changes the resistance of thermistor R4, which in turn changes the voltage input to operational amplifier A1. This voltage is then output via first field-effect transistor D1 as a corresponding temperature signal. Resistors R1 and R2 act as voltage dividers and current limiters, and are connected to DC power supply VDD to set the bias voltage. A third resistor R3, connected to the negative terminal of the operational amplifier, helps adjust the input signal.

[0047] The implementation of the embodiments of the present invention includes the following beneficial effects: The embodiments of the present invention provide a temperature-controlled backup power supply for a distribution network, including: a battery housing 100 and multiple groups of lithium battery modules 300 arranged in the battery housing 100, and immersion refrigerant is filled between the multiple lithium battery modules 300. A heating module 400 is arranged between the first surface in the battery housing 100 and the lithium battery module 300, and a first temperature sensing unit 510 is arranged between the second surface in the battery housing 100 and the lithium battery module 300. The first surface and the second surface in the battery housing 100 are opposite to each other, and a second temperature sensing unit is arranged along the height direction of the lithium battery module 300. The first temperature sensing unit 510 detects the temperature of the refrigerant above the lithium battery module 300, and heats it through the heating module 400. When the temperature of the refrigerant above the lithium battery module 300 reaches the preset temperature, the temperature of other areas also reaches the preset temperature, thereby avoiding frequent startup of the heating module 400 or inaccurate heating. At the same time, the second temperature sensing unit can detect the temperature in the height direction of the battery module, avoiding local high temperature damage to the lithium battery module 300. Therefore, the present application can preheat its lithium battery module 300 when the backup power supply is enabled, reduce the internal resistance of the battery, thereby reducing the pressure difference of cold start, avoiding triggering the battery low voltage protection, and ensuring the stable operation of related equipment.

[0048] In a second aspect, an embodiment of the present invention provides a temperature-controlled backup power supply system for a distribution network, including the above-mentioned temperature-controlled backup power supply for the distribution network.

[0049] It can be seen that the temperature-controlled backup power supply of the distribution network in the above embodiments are all applicable to the embodiments of this system. The functions specifically implemented by the embodiments of this system are the same as those in the above-mentioned embodiments of the temperature-controlled backup power supply of the distribution network, and the beneficial effects achieved are also the same as those achieved by the above-mentioned embodiments of the temperature-controlled backup power supply of the distribution network.

[0050] Throughout this specification, references to the term "in a specific embodiment" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A temperature-controlled backup power supply for a distribution network, characterized in that: It includes a battery shell and multiple groups of lithium battery modules arranged in the battery shell, the multiple lithium battery modules are filled with immersion refrigerant, a heating module is arranged between the first surface of the battery shell and the lithium battery module, and a first temperature sensing unit is arranged between the second surface of the battery shell and the lithium battery module. The first surface and the second surface of the battery shell are opposite to each other, and a second temperature sensing unit is arranged along the height direction of the lithium battery module.

2. The temperature-controlled backup power supply for the distribution network according to claim 1, characterized in that: At least one pair of magnetic field generators is also provided on the battery housing. The pair of magnetic field generators are relatively arranged on the first surface and the second surface of the battery housing. The immersion refrigerant includes vegetable oil and magnetic nanoparticles.

3. The temperature-controlled backup power supply for the distribution network according to claim 1, characterized in that: A guide plate is arranged between adjacent lithium battery modules, and the guide plate is arranged along the height direction of the lithium battery modules.

4. The temperature-controlled backup power supply for the distribution network according to claim 3, characterized in that: A heat insulation plate is arranged in the middle of the guide plate.

5. The temperature-controlled backup power supply for the distribution network according to claim 1, characterized in that: A ribbed frame is also provided between the battery housing and the lithium battery module. The ribbed frame includes a first support plate, a second support plate and a support rod. The first support plate is in close contact with the battery housing or the heating module, the second support plate is in close contact with the lithium battery module, and the support rod is used to connect the first support plate and the second support plate.

6. The temperature-controlled backup power supply for the distribution network according to claim 5, characterized in that: The first temperature sensing unit is arranged on the groove frame between the second surface inside the battery shell and the lithium battery module, and the second support plate in contact with the upper surface of the lithium battery module is configured as a battery protection plate, and the upper surface of the lithium battery module is opposite to the second surface inside the battery shell.

7. The temperature-controlled backup power supply for the distribution network according to claim 6, characterized in that: The first end of the battery protection board is respectively connected to the first positive electrode interface and the first negative electrode interface of the multiple lithium battery modules, and the second end of the battery protection board is respectively connected to the second positive electrode interface and the second negative electrode interface on the battery shell.

8. The temperature-controlled backup power supply for a distribution network according to claim 1, characterized in that: The battery shell is also provided with a breathing valve and an explosion-proof valve.

9. The temperature-controlled backup power supply for a distribution network according to claim 1, characterized in that: The first temperature sensing unit includes a temperature sensing circuit, which includes a first resistor, a second resistor, a third resistor, a thermistor, an operational amplifier and a first field-effect transistor. The first end of the first resistor and the first end of the second resistor are both connected to a DC power supply, the second end of the first resistor and the first end of the thermistor are both connected to the positive port of the operational amplifier, the second end of the second resistor and the first end of the third resistor are both connected to the negative port of the operational amplifier, the second end of the third resistor and the second end of the thermistor are both grounded, the output interface of the operational amplifier is connected to the second port of the first field-effect transistor, the third port of the first field-effect transistor is grounded, and the first port of the first field-effect transistor is connected to the DC power supply.

10. A temperature-controlled backup power supply system for a distribution network, characterized in that: A temperature-controlled backup power supply for a distribution network comprising the method described in any one of claims 1 to 9.

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