Energy storage system

Abstract

An embodiment of the utility model discloses an energy storage system which comprises a power supply device, a busbar, a battery cabinet and a heating device, the busbar is connected with the power supply device and the battery cabinet, the power supply device is connected with the battery cabinet through the busbar, and the busbar is located outside the power supply device and the battery cabinet and in a non-closed environment. When an energy storage system is in an environment with large temperature difference change and high humidity, condensation easily occurs on a busbar, and short circuit of the energy storage system is easily caused, a heating device is arranged in the embodiment to heat the busbar, so that the temperature of the busbar is increased to avoid condensation on the busbar caused by the fact that the temperature of the busbar is lower than the dew point temperature of the environment, and the service life of the energy storage system is prolonged. And risks of short circuit and even combustion of the energy storage system are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to an energy storage system. Background Art

[0002] In the energy storage system, equipment such as battery cabinets are in a closed state with circulating gas flowing inside to avoid condensation inside the battery cabinet. However, there is no anti-condensation solution for the busbar outside the battery cabinet in a non-enclosed environment. Utility Model Content

[0003] The embodiment of the utility model provides an energy storage system, aiming to solve the technical problem of preventing condensation of a busbar in a non-enclosed environment in the energy storage system.

[0004] In a first aspect, an embodiment of the present application proposes an energy storage system, comprising: a power supply device, a busbar, a battery cabinet and a heating device; the battery cabinet comprises a plurality of batteries, the power supply device is connected to the battery cabinet via the busbar; the heating device is used to heat the busbar.

[0005] This embodiment proposes an energy storage system, in which a busbar is connected to a power supply device and a battery cabinet. The power supply device is connected to the battery cabinet through the busbar to supply power to the batteries in the battery cabinet. The busbar is outside the power supply device and the battery cabinet and is in a non-enclosed environment. When the energy storage system is in an environment with large temperature differences and high humidity, condensation is likely to occur on the busbar, which may easily cause a short circuit in the energy storage system. In this embodiment, a heating device is provided to heat the busbar to increase the temperature of the busbar to avoid condensation on the busbar due to the busbar temperature being lower than the dew point temperature of the environment, thereby greatly reducing the risk of short circuit or even combustion of the energy storage system.

[0006] In some embodiments, the heating device includes: a resistance wire, and the resistance wire is wound around the busbar. In this embodiment, the resistance wire is used to heat the busbar, which can save costs.

[0007] In some embodiments, a moisture-proof coating is provided on the surface of the busbar, and the resistance wire is wound around the moisture-proof coating.

[0008] In this embodiment, the anti-moisture coating provides a buffer time for the startup of the heating device by absorbing moisture in the air or preventing moisture penetration, thereby avoiding condensation on the busbar surface during the startup of the heating device; and when the resistance wire heats up, the moisture absorbed in the anti-moisture coating can be evaporated, thereby extending the service life of the anti-moisture coating.

[0009] In some embodiments, the invention further comprises: a first controller connected to the heating device;

[0010] The first controller is used to control the heating device to turn on during a time period when the power supply device and the battery cabinet are not working.

[0011] In this embodiment, the first controller is connected to the heating device. The first controller controls the heating device to turn on during the time period when the power supply device and the battery cabinet are not working, so as to heat the busbar, so as to avoid overheating of the busbar caused by heating during the working time period of the power supply device and the battery cabinet, and also save costs.

[0012] In some embodiments, the energy storage system further includes: a busbar temperature detection device, a dew point temperature detection device, and a second controller connected to the busbar temperature detection device, the dew point temperature detection device and the heating device;

[0013] The busbar temperature detection device is connected to the busbar, and the dew point temperature detection device is arranged in the environment where the busbar is located;

[0014] The second controller is used to obtain the temperature of the busbar detected by the busbar temperature detection device and the dew point temperature detected by the dew point temperature detection device, and control the heating device to turn on when the temperature of the busbar is close to the dew point temperature.

[0015] In this embodiment, the second controller is used to control the heating device to start heating the busbar when the temperature of the busbar is close to the dew point temperature, rather than controlling the heating device to start heating the busbar when the temperature of the busbar is equal to the dew point temperature. This can provide the heating device with a buffer time to start heating and prevent condensation from forming on the busbar during the startup of the heating device.

[0016] In some embodiments, the heating device is connected to the batteries in the battery cabinet, and the batteries in the battery cabinet provide power for the heating device.

[0017] In this embodiment, an independent power supply is not provided for the heating device. Instead, the batteries in the battery cabinet are used to power the heating device. There is no need to provide an additional power supply, which can save costs.

[0018] In some embodiments, the power supply device includes: a power module, a main connecting bar and a junction box;

[0019] The power module is connected to the combiner cabinet via the main connecting bar, and the combiner cabinet is connected to the battery cabinet via the busbar;

[0020] The heating device is also used to heat the main connecting bar.

[0021] In this embodiment, the heating device is also used to heat the main connecting bar to increase the temperature of the main connecting bar to prevent condensation on the main connecting bar due to the temperature of the main connecting bar being lower than the dew point temperature of the environment.

[0022] In some embodiments, the resistance wire is wrapped with an insulating layer.

[0023] In this embodiment, the resistance wire is wrapped with an insulating layer to prevent the resistance coil from short-circuiting due to contact and failing to heat, to prevent the resistance wire from being directly wound around the busbar or the main connecting bar and being connected to the busbar or the main connecting bar and burning the resistance wire, and to prevent the resistance wire from being exposed to air and being oxidized and corroded.

[0024] In some embodiments, the busbar includes a positive current busbar and a negative current busbar;

[0025] The color of the insulating layer of the resistance wire wound on the positive current busbar is a first color, and the color of the insulating layer of the resistance wire wound on the negative current busbar is a second color, and the first color and the second color are different.

[0026] In this embodiment, the colors of the insulation layers of the resistance wires wound around the positive current busbar and the negative current busbar are set to be different, so that operators can intuitively distinguish the positive current busbar and the negative current busbar, thereby facilitating operators to repair and maintain the energy storage system.

[0027] In some embodiments, the heating device includes: a heating plate or a heating tube, and the heating plate or the heating tube is arranged under the busbar.

[0028] This embodiment provides another implementation of the heating device.

[0029] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of an embodiment of the present utility model;

[0032] Figure 2 A schematic diagram of the structure of another embodiment of the present utility model;

[0033] Figure 3This is a schematic diagram of the cross-sectional area of ​​a busbar in an embodiment of the utility model;

[0034] Figure 4 A schematic diagram of the structure of another embodiment of the present utility model;

[0035] Figure 5 A schematic diagram of the structure of another embodiment of the present utility model;

[0036] Figure 6 A schematic diagram of the structure of another embodiment of the present utility model;

[0037] Figure 7 A schematic diagram of the structure of another embodiment of the present utility model;

[0038] Figure 8 The present invention is a schematic structural diagram of another embodiment of the present invention.

[0039] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of the present utility model, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0043] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0045] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0047] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0048] Dew point, also known as dew point temperature, refers to the temperature that the gaseous water contained in the air needs to drop to when it reaches saturation and condenses into liquid water under a fixed air pressure in meteorology. At this temperature, the condensed water floating in the air is called fog, and when it sticks to the solid surface, it is called dew, hence the name dew point. In meteorology, the lower the temperature, the smaller the saturated water vapor pressure. Therefore, for air containing a certain amount of water vapor, the temperature is lowered while the air pressure remains unchanged, so that the saturated water vapor pressure drops to a temperature equal to the actual water vapor pressure at that time. This is called the dew point. Figuratively speaking, the temperature when the water vapor in the air turns into dew is called the dew point. Generally speaking, when the surface temperature of an object is equal to or lower than the dew point temperature, condensation will form on the surface of the object. If condensation occurs in the energy storage system, it may cause the energy storage system to short-circuit or even burn. Therefore, it is generally necessary to set an anti-condensation device in the energy storage system.

[0049] In the energy storage system, the power supply device supplies power to the battery cabinet, and the power supply device and the battery cabinet are in a closed state. Therefore, heaters and exhaust fans are generally installed inside the power supply device and the battery cabinet to remove moisture from the power supply device and the battery cabinet to avoid condensation inside the power supply device and the battery cabinet. For example, a heater and an exhaust fan can be installed in the battery cabinet, and the electrical components in the battery cabinet can be dried at a close distance by the heater, and the moisture can be exhausted by the exhaust fan, which can effectively prevent the generation of condensation in the battery cabinet.

[0050] However, the busbar connecting the power supply device and the battery cabinet is in a non-enclosed environment. Condensation is prone to occur on the busbar in an environment with large temperature differences and high humidity, which leads to a decrease in the insulation performance of the busbar. It may also cause the energy storage system to short-circuit or even burn when the energy storage system is put into operation.

[0051] To address this, a heating device is provided in the embodiment of the present application to heat the busbar exposed to the air, thereby increasing the temperature of the busbar to avoid condensation on the busbar due to the busbar temperature being lower than the dew point temperature of the environment, thereby greatly reducing the risk of short circuit or even combustion of the energy storage system.

[0052] In some embodiments of the present invention, referring to Figure 1 The embodiment of the utility model proposes an energy storage system including: a power supply device 10, a battery cabinet 20, a busbar 30 and a heating device 401. The battery cabinet 20 includes a plurality of batteries, the power supply device 10 is connected to the battery cabinet 20 through the busbar 30, and supplies power to the batteries in the battery cabinet 20; the heating device 401 is used to heat the busbar 30.

[0053] Specifically, the battery cabinet 20 includes a plurality of batteries, which may be battery cells or battery clusters, wherein a battery cluster is a battery assembly that is independently operated after battery cells are connected in series, in parallel, or in series and in parallel, and are connected to an energy storage inverter and ancillary facilities.

[0054] The busbar 30 refers to a copper or aluminum busbar that is used as an electrical connection in the power supply system. The main function of the busbar 30 is to be used as a conductor. The power supply device 10 is connected to the battery cabinet 20 through the busbar 30 to supply power to the batteries in the battery cabinet 20.

[0055] The busbar 30 is outside the power supply device 10 and the battery cabinet 20 and is in a non-enclosed environment. When the busbar 30 is in an environment with a large temperature difference and high humidity, condensation is likely to occur on the surface of the busbar 30, which may easily cause a short circuit in the energy storage system. In this embodiment, a heating device 401 is provided to heat the busbar 30 to increase the temperature of the busbar 30, so as to avoid condensation on the busbar 30 due to the temperature of the busbar 30 being lower than the dew point temperature of the environment, thereby greatly reducing the risk of short circuit or even combustion of the energy storage system.

[0056] Realizable, such as Figure 1 As shown, the busbar 30 includes a positive current busbar 30 and a negative current busbar 30 , and the heating device 401 heats the positive current busbar 30 and the negative current busbar 30 .

[0057] Realizable, such as Figure 2 As shown, in the energy storage system, there may be multiple battery cabinets 20 and multiple busbars 30, and each of the multiple battery cabinets 20 is connected to the power supply device 10 via a positive current busbar 30 and a negative current busbar 30. The heating device 401 heats the multiple busbars 30.

[0058] In some embodiments, reference Figure 1 and Figure 2 The heating device 401 includes: a resistance wire, which is wound around the busbar 30.

[0059] In this embodiment, the resistance wire is used to heat the busbar 30, which can save costs. The resistance wire can be fixed on the surface of the busbar 30 in a winding and covering manner.

[0060] The material of the resistance wire can be graphite, tungsten, tungsten alloy (such as tungsten-copper alloy), nickel-chromium alloy, iron-chromium-aluminum alloy, copper-nickel alloy, chromium-iron alloy or titanium alloy. Different resistance wire materials are suitable for different working temperatures and environments. In this embodiment, the appropriate material can be selected according to specific needs.

[0061] Among them, graphite resistance wire has the advantages of high temperature resistance and easy processing. When the cross-sectional area of ​​the resistance wire is large, a low voltage and high current power supply can be used to power the resistance wire. The resistance value of the resistance wire does not change much with temperature and can work in an environment below 2000℃.

[0062] Tungsten resistance wire has good conductivity, small expansion coefficient and good corrosion resistance.

[0063] Nickel-chromium alloy resistance wire is composed of two metals, nickel and chromium, and has excellent high temperature resistance and oxidation corrosion resistance. Nickel-chromium alloy resistance wire is suitable for environments with working temperatures below 600℃ and can provide stable heating performance.

[0064] Iron-chromium-aluminum alloy resistance wire is a low resistance high temperature resistance wire, which is composed of three metals: iron, chromium and aluminum. It has a high resistivity and a low temperature coefficient, and can provide stable heating performance at higher temperatures. Iron-chromium-aluminum alloy resistance wire is suitable for environments with working temperatures below 1000℃.

[0065] Copper-nickel alloy resistance wire is a resistance wire material with low resistivity and high thermal conductivity. It is composed of two metals, copper and nickel, and can provide high heating effect at low voltage. Copper-nickel alloy resistance wire is suitable for environments with working temperature below 200℃.

[0066] Titanium alloy resistance wire is a high temperature resistance wire material, composed of titanium and other alloy elements. It has excellent high temperature resistance and oxidation corrosion resistance, and can provide stable heating performance in high temperature environment. Titanium alloy resistance wire is suitable for environments with working temperature above 1000℃.

[0067] The busbar 30 may include a positive current busbar 30 and a negative current busbar 30. Therefore, the heating device 401 may include at least two resistance wires, which are respectively wound around the positive current busbar 30 and the negative current busbar 30. The two resistance wires may be connected in parallel or in series, for example Figure 1 As shown in FIG. 1 , two resistance wires on the positive current busbar 30 and the negative current busbar 30 are connected in series.

[0068] The battery cabinet 20 is multiple, for example, Figure 2 There are two battery cabinets 20, one battery cabinet 20 includes sub-battery cabinets 1 to 4, and the other battery cabinet 20 includes sub-battery cabinets 5 to 9. When there are multiple busbars 30, multiple resistance wires can be set, and the multiple resistance wires correspond to the multiple busbars 30 one by one, and one resistance wire is wound around one busbar 30. These multiple resistance wires can be powered by different power supplies or the same power supply. When the same power supply is used, these multiple resistance wires can be connected in parallel, in series, or in series-parallel mode, for example Figure 2 As shown in FIG. 1 , multiple positive current busbars 30 and multiple resistance wires on the negative current busbars 30 are connected in series.

[0069] In some embodiments, reference Figure 3 A moisture-proof coating 50 is provided on the surface of the busbar 30 , and the resistance wire is wound around the moisture-proof coating 50 .

[0070] Specifically, the material of the moisture-proof coating 50 includes one of the following or any combination thereof: silica gel, activated carbon, waterproof coating, waterproof glue, etc. The materials of the moisture-proof coating 50 can be divided into two categories, one of which achieves the purpose of moisture-proof by absorbing moisture in the air, such as silica gel and activated carbon; the other of which achieves the purpose of moisture-proof by preventing moisture penetration, such as waterproof coating and waterproof glue.

[0071] The moisture-proof coating 50 can cover the exposed surface of the busbar 30 in all directions. Since it takes a certain amount of time to start the heating device 401, during this period of time, water may be precipitated from the surface of the busbar 30, and the precipitated water will first encounter the moisture-proof coating 50 on the surface of the busbar 30. If the material of the moisture-proof coating 50 is a material such as silica gel, activated carbon, etc., the precipitated water will be absorbed by the moisture-proof coating 50, and condensation will only appear after the moisture-proof coating 50 is saturated with adsorption, which can effectively delay the generation of condensation within a certain period of time. If the material of the moisture-proof coating 50 is a material such as waterproof coating, waterproof glue, etc., the precipitated water will be blocked by the moisture-proof coating 50, which can prevent the generated condensation from penetrating into the moisture-proof coating 50 and contacting the surface of the busbar 30, and can avoid the harm caused by the generation of condensation to a certain extent. In this embodiment, the moisture-proof coating 50 provides a buffer time for the start of the heating device 401 by absorbing moisture in the air or preventing moisture from penetrating, thereby preventing condensation from forming on the surface of the busbar 30 during the start-up of the heating device 401.

[0072] It should be noted that the resistance wire is wound around the anti-moisture coating 50. Firstly, the surface of the resistance wire is uneven, while the surface of the busbar 30 is flat, which makes it convenient to coat the anti-moisture coating 50. Secondly, if the resistance wire is broken, the resistance wire can be replaced without damaging the anti-moisture coating 50. Thirdly, when the resistance wire heats up, the moisture absorbed in the hygroscopic anti-moisture coating 50 can be evaporated, thereby extending the service life of the anti-moisture coating 50.

[0073] In some embodiments, Figure 1 As shown in or 2, the energy storage system also includes: a first controller 402, the first controller 402 is connected to the heating device 401; the first controller 402 is used to control the heating device 401 to turn on during the time period when the power supply device and the battery cabinet are not working.

[0074] In this embodiment, the energy storage system further includes: a first controller 402 , which can control the heating device 401 to turn on during a time period when the power supply device 10 and the battery cabinet 20 are not working, so as to heat the busbar 30 .

[0075] Generally speaking, during the working period of the power supply device 10 and the battery cabinet 20, the current passing through the busbar 30 is relatively large, which will generate heat inside the busbar 30, causing the busbar 30 to heat up. The heat dissipated by the busbar 30 itself is sufficient to prevent condensation on the busbar 30. For example: Assume that there are two battery cabinets 20, one battery cabinet 20 includes sub-battery cabinets 1 to 4, and the other battery cabinet 20 includes sub-battery cabinets 5 to 9. The total resistance of the positive current busbar 30 connected to the sub-battery cabinets 1 to 4 is 108.3μΩ, and the total resistance of the negative current busbar 30 is 96.2μΩ; the total resistance of the positive current busbar 30 connected to the sub-battery cabinets 5 to 9 is 81.19μΩ, and the total resistance of the negative current busbar 30 is 90.77μΩ. The average value is (108.3+96.2+81.19+90.77) / 4=94.115μΩ. According to the working current of 2000A and working time of 4h, the total heat Q of all busbars 30 is:

[0076] Q=I 2 Rt=2000×2000×0.000094115×4×3600=5421024J

[0077] According to the current ambient temperature of 30°C and the current ambient humidity of 43%, it can be calculated that the current dew point temperature is 16°C.

[0078] According to the calculation formula of calorific value and temperature: Q = cmΔt, assuming that the busbar 30 is a copper busbar, the total mass m of all busbars 30 is 40 kg, and the specific heat capacity c of copper is 0.39×10 3 J / (kg·℃), substituting the total mass m and specific heat capacity c of the busbar 30 into the above formula, it can be obtained that the temperature change of the busbar 30 is Δt=Q / cm=5421024 / (0.39×10 3 ×40)=34℃.

[0079] That is to say, during the time period when the power supply device 10 and the battery cabinet 20 are working, the temperature of the busbar 30 rises by 34°C, which is much higher than the current dew point temperature. Therefore, it can be concluded that during the time period when the power supply device 10 and the battery cabinet 20 are working normally, the heat emitted by the busbar 30 is sufficient to prevent condensation on the busbar 30. In view of this, the first controller 402 in this embodiment can control the heating device 401 to turn on during the time period when the power supply device 10 and the battery cabinet 20 are not working, so as to heat the busbar 30, so as to avoid overheating of the busbar 30 caused by heating during the working time period, and at the same time, it can also save costs.

[0080] It should be noted that the first controller 402 can be a control switch that controls the heating device 401 to be turned on or off, and is manually controlled by a staff member; the first controller 402 can also be a computing device that controls the heating device 401 to be turned on or off by receiving computer instructions.

[0081] In some embodiments, see Figure 4 The energy storage system further includes: a busbar temperature detection device 60, a dew point temperature detection device 70, and a second controller 403 connected to the busbar temperature detection device 60, the dew point temperature detection device 70, and the heating device 401; the busbar temperature detection device 60 is connected to the busbar 30, and the dew point temperature detection device 70 is arranged in the environment where the busbar 30 is located; the second controller 403 is used to obtain the temperature of the busbar 30 detected by the busbar temperature detection device 60 and the dew point temperature detected by the dew point temperature detection device 70, and when the temperature of the busbar 30 is close to the dew point temperature, control the heating device 401 to turn on.

[0082] In this embodiment, the energy storage system also includes: a second controller 403, a busbar temperature detection device 60 and a dew point temperature detection device 70. The busbar temperature detection device 60 is connected to the heating device 401 and the busbar 30, and is used to measure the temperature of the busbar 30 and transmit the temperature to the second controller 403; the dew point temperature detection device 70 is used to measure the dew point temperature of the environment in which the busbar 30 is located, and transmit the dew point temperature to the second controller 403; the second controller 403 is used to control the heating device 401 to turn on when the temperature of the busbar 30 is close to the dew point temperature, so as to heat the busbar 30.

[0083] Specifically, the dew point temperature detection device 70 can be a dew point sensor, that is, a dew point meter, which is an instrument that can directly measure the dew point temperature and is a type of temperature and humidity sensor. The busbar temperature detection device 60 can be a temperature sensor. Realizable, the busbar temperature detection device 60 can also be implemented by a current detection device and a current controller. The current detection device can use a Hall sensor. The busbar 30 passes through the Hall sensor, and the current of the busbar 30 can be measured by the current detection device. The current detection device is connected to the current controller and sends the measured current of the busbar 30 to the current controller. The current controller is based on Q=I 2 Rt can be used to calculate the total heat generated by the busbar 30 , and then the temperature of the busbar 30 can be calculated according to Q=cmΔt.

[0084] The busbar temperature detection device 60 is used to measure the temperature of the busbar 30 and transmit the temperature of the busbar 30 to the second controller 403. The dew point temperature detection device 70 also transmits the measured dew point temperature of the environment in which the busbar 30 is located to the second controller 403. The second controller 403 compares the temperature of the busbar 30 with the dew point temperature and obtains a control instruction according to the control logic. The control instruction obtained according to the control logic includes: the second controller 403 is used to control the heating device 401 to turn on and heat the busbar 30 when the temperature of the busbar 30 is close to the dew point temperature. For example, the second controller 403 determines whether the temperature of the busbar 30 is decreasing according to the temperature of the busbar 30. If the temperature of the busbar 30 is decreasing and the difference between the temperature of the busbar 30 and the dew point temperature is less than a preset value, it can be determined that the temperature of the busbar 30 is close to the dew point temperature, and the heating device 401 is controlled to turn on and heat the busbar 30. The preset value may be 5°C, 3°C, etc. The preset value is generally not 0°C, so as to provide a buffer time for the heating device 401 to start heating and prevent condensation on the busbar 30 during the startup of the heating device 401.

[0085] In this embodiment, the second controller 403 is used to control the heating device 401 to start heating the busbar 30 when the temperature of the busbar 30 is close to the dew point temperature, rather than controlling the heating device 401 to start heating the busbar 30 when the temperature of the busbar 30 is equal to the dew point temperature. This can provide the heating device 401 with a buffer time to start heating, thereby preventing condensation from forming on the busbar 30 during the startup of the heating device 401.

[0086] Realistically, during the time period when the power supply device 10 and the battery cabinet 20 are working, the current passing through the busbar 30 is relatively large, which will generate heat inside the busbar 30, causing the busbar 30 to heat up. The heat emitted by the busbar 30 itself is sufficient to prevent condensation on the busbar 30. Therefore, during the time period when the power supply device 10 and the battery cabinet 20 are not working, the second controller 403 controls the busbar temperature detection device 60, the dew point temperature detection device 70 and the heating device 401 to be in the on state; during the time period when the power supply device 10 and the battery cabinet 20 are working, the second controller 403 controls the busbar temperature detection device 60, the dew point temperature detection device 70 and the heating device 401 to be in the off state to save costs.

[0087] In this embodiment, the busbar temperature detection device 60 and the dew point temperature detection device 70 are connected to the second controller 403. After the temperature and dew point temperature of the busbar 30 are transmitted to the second controller 403, the second controller 403 directly determines whether to start heating according to the preset control logic.

[0088] For example, when the busbar temperature detection device 60 can also be implemented by a current detection device and a current controller, the second controller 403 can adjust the working state of the heating device 401 by monitoring the magnitude of the busbar current 30 .

[0089] When the current passing through the busbar 30 increases, the heat generated by the busbar 30 increases, the ambient temperature rises, the humidity decreases, and the conditions for condensation are not met, and the heating device 401 does not work. For example: according to the working current of the busbar 30 of 2000A and working for 4 hours, the total heat generated by all busbars 30 is: Q = I 2 Rt=2000×2000×0.000094115×4×3600=5421024J. According to the current ambient temperature of 30℃ and the current ambient humidity of 43%, it can be calculated that the current dew point temperature is 16℃. According to the calculation formula of calorific value and temperature: Q=cmΔt, assuming that the busbar 30 is a copper busbar, the total mass m of all busbars 30 is 40kg, and the specific heat capacity c of copper is 0.39×103J / (kg·℃), the total mass m and specific heat capacity c of the busbar 30 are substituted into the above formula, and the temperature change of the busbar 30 can be obtained by Δt=Q / cm=5421024 / (0.39×103×40)=34℃. That is to say, during the working period of the power supply device 10 and the battery cabinet 20, the temperature of the busbar 30 rises by 34℃, which is much higher than the current dew point temperature. At this time, the heating device 401 does not work.

[0090] When the current passing through the busbar 30 decreases, the heat generated by the busbar 30 decreases, the ambient temperature decreases, and the humidity increases, which meets the conditions for condensation. At this time, the heating device 401 starts to work to prevent condensation from occurring. For example: according to the current ambient temperature of 30°C and the current ambient humidity of 43%, it can be calculated that the current dew point temperature is 16°C. Therefore, the temperature of the busbar 30 must be higher than 16°C to avoid condensation on the surface of the busbar 30. Assuming that in the most extreme case, the temperature of the busbar 30 is 0°C, the total heat required to raise the temperature of the busbar 30 to 16°C is Q=cmΔt=0.39×10 3 ×40×16=249600J, then substitute into the calorific value formula Q=I 2 Rt calculation, based on heating for 3h, I 2 R = Q / t = 249600 / 3 × 3600 = 23AΩ. When the total resistance R of the busbar 30 is fixed, a suitable voltage can be applied to the resistance wire according to this result; when the working voltage of the heating device 401 is fixed, a resistance wire with a suitable resistance value can be selected as the heating resistance wire according to this result.

[0091] In this embodiment, during the time period when the power supply device 10 and the battery cabinet 20 are working, and during the time period when the power supply device 10 and the battery cabinet 20 are not working, the heating value of the busbar 30 can be calculated through the current of the busbar 30. If the heating value is not enough to reduce the moisture content in the air around the busbar 30, the heating resistor is turned on to reduce the moisture content and achieve the purpose of preventing condensation.

[0092] It should be noted that the second controller 403 and the first controller 402 may be the same controller.

[0093] In some embodiments, the heating device 401 is connected to the batteries in the battery cabinet 20 , and the batteries in the battery cabinet 20 provide power for the heating device 401 .

[0094] In this embodiment, an independent power supply is not provided for the heating device 401 , but the batteries in the battery cabinet 20 are used to power the heating device 401 , and no additional power supply is required, which can save costs.

[0095] Realistically, a battery in the battery cabinet 20 may be designated to power the heating device 401. In the case where there are multiple battery cabinets 20 and multiple busbars 30, if multiple heating devices 401 are provided, one or more batteries may be designated to power the multiple heating devices 401.

[0096] It should be noted that in Figure 1 In the energy storage system shown, the batteries in the battery cabinet 20, the first controller 402 and the heating device 401 form a heating circuit, wherein the batteries in the battery cabinet 20 provide power for the heating circuit and the first controller controls the on and off of the heating circuit.

[0097] In some embodiments, Figure 5 and Figure 6 As shown, the power supply device 10 includes: a power module 101, a busbar 102 and a main connecting bar 103. The power module 101 is connected to the busbar 102 through the main connecting bar 103 to supply power to the busbar 102. The busbar 102 is connected to the battery cabinet 20 through the busbar 30 to supply power to the batteries in the battery cabinet 20. The heating device 401 is also used to heat the main connecting bar 103.

[0098] Specifically, the power module 101 provides a total power supply, and the total power supply is divided by the combiner cabinet 102 to provide power for multiple battery cabinets 20, wherein the voltage of the combiner cabinet 102 can be about 1.5kv, and the voltage of a single battery cabinet 20 can be about 200V-300V.

[0099] The material of the main connecting bar 103 is the same as that of the busbar 30, which is a copper bar or an aluminum bar. The main connecting bar 103 includes a positive current connecting bar and a negative current connecting bar. The power module 101 is connected to the combiner cabinet 102 through a positive current connecting bar and a negative current connecting bar. The combiner cabinet 102 is connected to multiple battery cabinets 20 through multiple busbars 30. The combiner cabinet 102 supplies power to a battery cabinet 20 through a positive current busbar 30 and a negative current busbar 30.

[0100] In this embodiment, the heating device 401 is also used to heat the main connecting bar 103 to increase the temperature of the main connecting bar 103 to prevent condensation on the main connecting bar 103 due to the temperature of the main connecting bar 103 being lower than the dew point temperature of the environment.

[0101] In some embodiments, the resistance wire is wrapped with an insulating layer. First, it is to prevent the resistance coil from short-circuiting and failing to heat. Second, it is to prevent the resistance wire from being directly wound around the busbar 30 or the main connecting bar 103 and conducting with the busbar 30 or the main connecting bar 103 and burning the resistance wire. Third, it can prevent the resistance wire from being exposed to air and being oxidized and corroded.

[0102] In some embodiments, the busbar 30 includes a positive current busbar 30 and a negative current busbar 30; the color of the insulation layer of the resistance wire wound on the positive current busbar 30 is a first color, and the color of the insulation layer of the resistance wire wound on the negative current busbar 30 is a second color, and the first color and the second color are different.

[0103] In this embodiment, the colors of the insulation layers of the resistance wires wound on the positive current busbar 30 and the negative current busbar 30 are set to be different, so that the operator can intuitively distinguish the positive current busbar 30 from the negative current busbar 30, and the operator can perform maintenance on the energy storage system. For example, the color of the insulation layer of the resistance wire wound on the positive current busbar 30 can be set to red, and the color of the insulation layer of the resistance wire wound on the negative current busbar 30 can be set to blue.

[0104] Realistically, the colors of the insulation layers of the resistance wires wound around the positive current connection bars and the negative current connection bars connecting the power module 101 and the combiner cabinet 102 may also be set to different colors.

[0105] In some embodiments, Figure 7 As shown, the heating device 401 includes: a heating plate or a heating tube, which is arranged below the busbar 30. In this embodiment, the heating device 401 can be not only a resistance wire, but also a heating plate or a heating tube, which is arranged below the busbar 30. The heating plate or the heating tube heats the air around the busbar 30, and the hot air rises and wraps the busbar 30 to increase the temperature around the busbar 30, thereby avoiding condensation on the busbar 30.

[0106] When there are multiple battery cabinets 20 and multiple busbars 30, multiple heating plates or heating tubes can be provided, and two or more adjacent busbars 30 can share the same heating plate or heating tube.

[0107] Realistically, the first controller 402 is connected to the heating plate or the heating tube to control the opening and closing of the heating plate or the heating tube.

[0108] In some embodiments, Figure 8 As shown, the energy storage system further includes a water cooling system 80 .

[0109] Specifically, in order to ensure the normal operation of the power module 101, the junction cabinet 102 and the battery cabinet 20, it is generally necessary to cool the power module 101, the junction cabinet 102 and the battery cabinet 20 to adjust the operating temperature of the power module 101, the junction cabinet 102 and the battery cabinet 20, and ensure that the power module 101, the junction cabinet 102 and the battery cabinet 20 operate at a better ambient temperature. Generally, the power module 101, the junction cabinet 102 and the battery cabinet 20 will continuously release heat when working, so it is necessary to set a water cooling system 80 to cool the power module 101, the junction cabinet 102 and the battery cabinet 20.

[0110] The water cooling system 80 may include: a condensing component 801 , a compression component 802 , a heat exchange component 803 and a cooling liquid circuit 800 to form a refrigerant circuit; the cooling liquid circuit 800 transfers the cold energy to the power supply device 10 and the battery cabinet 20 .

[0111] The condensation component 801 is a component for cooling the refrigerant. Specifically, when the refrigerant flows through the condensation component 801, it exchanges heat with the surrounding environment and releases heat to the surrounding environment. The condensation component 801 includes but is not limited to an air-cooled condensation component 801 and a water-cooled condensation component 801. Preferably, the condensation component 801 can be an air-cooled condensation component 801, which can specifically include a condenser and a fan.

[0112] The compression component 802 is used to provide power to the entire refrigerant circuit, and it pressurizes the low-temperature and low-pressure gaseous refrigerant and sends it to the condensation component 801 for condensation and heat release. The compression component 802 can be a compressor, which can specifically include an open, semi-closed, or fully closed compressor.

[0113] The heat exchange component 803 is used to perform heat exchange with the coolant circuit 800. Specifically, the heat exchange component 803 can be a heat exchanger, and preferably, it can be a plate heat exchanger.

[0114] The cooling liquid loop 800 is used to perform heat exchange with the heat exchange component 803, and then carry the cold energy to the power module 101, the junction cabinet 102 and the battery cabinet 20 for release, so as to cool down the power module 101, the junction cabinet 102 and the battery cabinet 20. Specifically, the cooling liquid loop 800 can be understood as a circulation loop. When the power module 101, the junction cabinet 102 and the battery cabinet 20 need to be cooled, the refrigerant loop generates cold energy, and the cooling liquid in the pipeline close to the heat exchange component 803 in the cooling liquid loop 800 absorbs the cold energy exchanged by the heat exchange component 803. The cooling liquid cools down and becomes a low-temperature cooling liquid. The low-temperature cooling liquid flows along the entire cooling liquid loop 800 to the vicinity of the battery cluster, releases cold energy to the battery cluster, the battery cluster cools down, and the low-temperature cooling liquid heats up. The heated cooling liquid flows along the pipeline again, and when it flows to the pipeline close to the heat exchange component 803 again, it absorbs the cold energy exchanged by the heat exchange component 803 again, and starts a new round of circulation. In practical applications, water can be selected as the coolant; the entire coolant loop 800 can also add a heating function, that is, when the power module 101, the junction cabinet 102 and the battery cabinet 20 need to be heated up, the coolant loop 800 can also provide heat. Specifically, a heating component can be set in the coolant loop 800, for example, a positive temperature coefficient thermistor (Positive Temperature Coefficient, PTC for short) can be set. In this way, the entire device can not only cool down the power module 101, the junction cabinet 102 and the battery cabinet 20, but also provide heat when the power module 101, the junction cabinet 102 and the battery cabinet 20 need to be heated up, which can realize thermal management of the power module 101, the junction cabinet 102 and the battery cabinet 20.

[0115] In some embodiments, Figure 8 As shown, the energy storage system also includes a fire protection system 90. The fire protection system 90 includes a fire detector. After detecting a fire signal, the fire detector can automatically cut off the relevant air conditioners in the alarm area, close the fire dampers on the pipelines, stop the relevant air exchangers, open the exhaust valves of the relevant pipelines, automatically close the electric fire doors and fire shutter doors at the relevant parts, cut off the non-fire protection power supply in sequence, turn on the emergency lighting and evacuation sign lights, stop all elevators except the fire elevators, and immediately start the fire extinguishing system through the controller of the control center to automatically extinguish the fire.

[0116] Realistically, the batteries in the battery cabinet 20 can power the fire protection system 90, and there is no need to set up a separate power supply to power the fire protection system 90, which can save costs.

[0117] In the embodiment of the present application, a heating device 401 is installed on the busbar 30 and a hygroscopic material is applied to prevent condensation.

[0118] (1) A heating resistor wire is wound around the surface of the busbar 30. When the power supply device 10 and the battery cabinet 20 are in a non-operating state, the heating resistor wire is powered by the battery in the battery cabinet 20 to generate heat. The heat generated by the heating resistor wire can reduce the moisture content in the environment surrounding the busbar 30, thereby achieving an anti-condensation effect.

[0119] (2) Coating an anti-moisture coating 50 (e.g., a silica gel desiccant coating) on ​​the surface of the busbar 30. When the silica gel desiccant coating is coated on the surface of the busbar 30, when the surface temperature of the busbar 30 is lower than the dew point temperature and water precipitates, it is first adsorbed into the coating on the surface of the busbar 30, and condensation will not occur until the adsorption is saturated. Coating a silica gel desiccant coating on the surface of the busbar 30 can effectively delay the generation of condensation for a certain period of time. By coating an anti-moisture coating 50 on the surface of the busbar 30, the generation of condensation and the harm it brings can be alleviated to a certain extent, and a buffer time can be provided for the start-up of the heating resistor wire.

[0120] (3) The heating resistance wire is powered by the battery in the battery cabinet 20 in the energy storage system, and there is no need to set up an independent power supply, which can save costs.

[0121] (4) When the energy storage system is not in operation, the battery supplies power to the heating resistor, causing the heating resistor to generate heat. The heat generated can reduce the moisture content in the environment surrounding the busbar 30, thereby achieving an anti-condensation effect.

[0122] (5) When the energy storage system is in operation, the current passing through the busbar 30 can be monitored and the heating value of the busbar 30 can be calculated. If the heating value is not enough to reduce the moisture content in the air around the busbar 30, the heating resistor wire is turned on to reduce the moisture content and achieve the purpose of preventing condensation.

[0123] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An energy storage system, characterized in that: include: Power supply unit, busbar, battery cabinet and heating unit; The battery cabinet includes a plurality of batteries, and the power supply device is connected to the battery cabinet via the busbar; The heating device is used to heat the busbar.

2. The energy storage system according to claim 1, characterized in that: The heating device comprises: a resistance wire, and the resistance wire is wound on the busbar.

3. The energy storage system according to claim 2, characterized in that: The surface of the busbar is provided with a moisture-proof coating, and the resistance wire is wound outside the moisture-proof coating.

4. The energy storage system according to any one of claims 1 to 3, characterized in that: Also includes: a first controller connected to the heating device; The first controller is used to control the heating device to turn on during a time period when the power supply device and the battery cabinet are not working.

5. The energy storage system according to any one of claims 1 to 3, characterized in that: The energy storage system further includes: a busbar temperature detection device, a dew point temperature detection device, and a second controller connected to the busbar temperature detection device, the dew point temperature detection device and the heating device; The busbar temperature detection device is connected to the busbar, and the dew point temperature detection device is arranged in the environment where the busbar is located; The second controller is used to obtain the temperature of the busbar detected by the busbar temperature detection device and the dew point temperature detected by the dew point temperature detection device, and control the heating device to turn on when the temperature of the busbar is close to the dew point temperature.

6. The energy storage system according to any one of claims 1 to 3, characterized in that: The heating device is connected to the batteries in the battery cabinet, and the batteries in the battery cabinet provide power for the heating device.

7. The energy storage system according to any one of claims 1 to 3, characterized in that: The power supply device comprises: a power module, a main connecting bar and a junction box; The power module is connected to the combiner cabinet via the main connecting bar, and the combiner cabinet is connected to the battery cabinet via the busbar; The heating device is also used to heat the main connecting bar.

8. The energy storage system according to claim 2 or 3, characterized in that: The resistance wire is wrapped with an insulating layer.

9. The energy storage system according to claim 8, characterized in that: The busbar comprises a positive current busbar and a negative current busbar; The color of the insulating layer of the resistance wire wound on the positive current busbar is a first color, and the color of the insulating layer of the resistance wire wound on the negative current busbar is a second color, and the first color and the second color are different.

10. The energy storage system according to claim 1, characterized in that: The heating device comprises: a heating plate or a heating tube, and the heating plate or the heating tube is arranged below the busbar.

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