An electric storage type water tank, water heater and control method thereof

Abstract

The present invention discloses a battery-storage water tank, a water heater, and a control method thereof, which relate to the field of water heaters and solve the technical problems in the prior art that water heater tanks have a single function and a poor user experience. The battery-storage water tank of the present invention comprises a water tank liner, a water tank shell, and a battery-storage insulation component. The water tank liner is used to store water. The battery-storage insulation component comprises a solar panel, a battery, an insulation layer, and an electric inverter, wherein the insulation layer is located between the water tank liner and the water tank shell. The solar panel is connected to the battery, which is also connected to the electric inverter. The electric inverter is also electrically connected to the electric heater in the water tank liner and the water heater unit. The battery-storage water tank of the present invention not only stores water and keeps it warm, but also has the function of storing electricity, which can reduce power consumption and improve user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to an electric storage water tank, a water heater and a control method thereof. Background Art

[0002] Currently, most air-energy water heater tank insulation methods on the market involve filling the space between the inner tank and the outer shell with a foaming agent. After the foaming agent expands and dries, it not only provides insulation but also better secures the inner tank. This method is widely favored. The volume of the space between the inner tank and the outer shell varies depending on the volume of the water tank. The larger the volume, the larger the water tank, the more foaming agent is used, and the difficulty of the foaming process increases. In today's world of high housing prices, the placement of larger water tanks is a real concern for users. On the one hand, the water tank is large and takes up a lot of space. On the other hand, from the user's subjective perspective, the function of the water tank is relatively simple. Even if it is placed in the corner of the balcony, the user may feel that the water tank has a simple function but takes up more space. Therefore, there is an urgent need to improve existing water tanks.

[0003] As society's demand for energy continues to rise, people are increasingly focusing on the development of renewable resources. Solar energy, as an easily accessible, low-cost, and pollution-free energy source, undoubtedly offers advantages. If solar energy can be harnessed effectively, the long-term energy savings could be substantial. Therefore, combining solar energy with water tanks to create a multifunctional water tank holds great promise. Summary of the Invention

[0004] One of the objectives of the present invention is to provide a battery-powered water tank that addresses the technical issues of existing water heater tanks, which have limited functionality and a poor user experience. The various technical benefits of the preferred technical solution of the present invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The electrically storable water tank of the present invention comprises a water tank liner, a water tank shell and an electrically storable thermal insulation component, wherein the water tank liner is used to store water, and the electrically storable thermal insulation component comprises a solar panel, a battery, an insulation layer and an electric inverter, wherein the insulation layer is located between the water tank liner and the water tank shell, the solar panel is connected to the battery, the battery is also connected to the electric inverter, and the electric inverter is also electrically connected to the electric heater and the water heater unit in the water tank liner.

[0007] According to a preferred embodiment, the thermal insulation layer includes a thermal insulation wall, the cross section of the thermal insulation wall is formed into an annular cavity, and the annular cavity is in a vacuum state.

[0008] According to a preferred embodiment, the cross section of the heat-insulating wall is formed into an annular cavity with a notch, and both ends of the annular cavity have sealing portions.

[0009] According to a preferred embodiment, the thermal insulation layer further includes an adsorption device, which is placed in the annular cavity and is used to adsorb gaseous substances in the annular cavity.

[0010] According to a preferred embodiment, the battery is built into the annular cavity, and the thermal insulation wall includes an insulating layer, a transparent layer and a reflective layer in sequence from a side close to the battery to a side away from the battery.

[0011] According to a preferred embodiment, the insulating layer is a rubber layer; the transparent layer is a kraft paper layer; the reflective layer is a plastic heat-sealing layer, and the inner layer of the plastic heat-sealing layer is a plastic sheet, and the surface of the plastic sheet is provided with an aluminum film coating.

[0012] According to a preferred embodiment, the power inverter has an input end, an output end and a ground end, wherein the input end is electrically connected to the battery, the output end is electrically connected to the electric heater and the water heater unit in the water tank inner tank, and the ground end is connected to the grounding wire.

[0013] The electric storage water tank provided by the present invention has at least the following beneficial technical effects:

[0014] The present invention provides a battery-storage water tank comprising a water tank liner, a water tank shell, and a battery-storage insulation assembly. The water tank liner is used to store water. The battery-storage insulation assembly comprises a solar panel, a battery, an insulation layer, and an electric inverter. The insulation layer is located between the water tank liner and the water tank shell. The solar panel is connected to the battery, which is further connected to the electric inverter. The electric inverter is further electrically connected to an electric heater and a water heater unit within the water tank liner. Thus, the battery-storage water tank of the present invention, through the functions of the solar panel, battery, and electric inverter, can convert solar energy into electrical energy, which is then supplied to the electric heater and water heater unit within the water tank liner, thereby saving electricity. The insulation layer can also keep the water within the water tank liner warm. In other words, the battery-storage water tank of the present invention not only stores water and maintains heat, but also has the function of storing electricity, thereby reducing energy consumption and improving user experience. This solves the technical problem of water heater tanks in the prior art having a single function and a poor user experience.

[0015] The second object of the present invention is to provide a water heater.

[0016] The water heater of the present invention comprises the electric storage type water tank described in any one of the technical solutions of the present invention.

[0017] The water heater provided by the present invention has at least the following beneficial technical effects:

[0018] The water heater of the present invention includes a chargeable water tank according to any one of the technical solutions of the present invention, so that the water heater of the present invention not only has the function of storing water and keeping it warm, but also can convert solar energy into electrical energy and supply it to the electric heater in the water tank and the water heater unit, thereby saving electricity and improving user experience.

[0019] The third object of the present invention is to provide a control method for a water heater.

[0020] The water heater control method according to any one of the technical solutions of the present invention comprises the following steps:

[0021] Get the real-time water temperature in the water tank and the operating status of the water heater unit;

[0022] Compare the real-time water temperature in the water tank with the preset water temperature;

[0023] Based on the comparison result between the real-time water temperature in the water tank inner tank and the preset water temperature and the operating status of the water heater unit, the power inverter is controlled to be electrically connected to the electric heater in the water tank inner tank, or the power inverter is controlled to be electrically connected to the water heater unit.

[0024] According to a preferred embodiment, when the water heater unit is in operation, the power inverter is controlled to be electrically connected to the water heater unit, and when the real-time water temperature in the water tank inner tank is greater than or equal to a first preset water temperature, the water heater unit is controlled to be in an off state, and at the same time, the power inverter is controlled to be electrically connected to the electric heater in the water tank inner tank; when the water heater unit is in an off state and the real-time water temperature in the water tank inner tank is less than a second preset water temperature, the power inverter is controlled to be electrically connected to the electric heater in the water tank inner tank.

[0025] The water heater control method provided by the present invention has at least the following beneficial technical effects:

[0026] The control method of the water heater described in any technical solution of the present invention includes obtaining the real-time water temperature in the water tank inner tank and the operating status of the water heater unit, comparing the real-time water temperature in the water tank inner tank with the preset water temperature, and based on the comparison result of the real-time water temperature in the water tank inner tank and the preset water temperature and the operating status of the water heater unit, controlling the power inverter to be electrically connected to the electric heater in the water tank inner tank, or controlling the power inverter to be electrically connected to the water heater unit, so that the water heater can not only have the function of storing water and keeping it warm, but also convert solar energy into electrical energy, and supply it to the electric heater in the water tank inner tank and the water heater unit for use, thereby saving electricity and improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of a preferred embodiment of the electric storage water tank of the present invention;

[0029] Figure 2 This is a first schematic diagram of a preferred embodiment of the electric storage type heat preservation assembly of the present invention;

[0030] Figure 3 This is a second schematic diagram of a preferred embodiment of the electric storage type heat preservation assembly of the present invention;

[0031] Figure 4 yes Figure 3 Enlarged view of part A;

[0032] Figure 5 Schematic diagram of a preferred embodiment of the thermal insulation layer of the present invention;

[0033] Figure 6 yes Figure 5 Enlarged view of part B;

[0034] Figure 7 is a flow chart of a preferred embodiment of the water heater control method of the present invention;

[0035] Figure 8 It is a flow chart of another preferred embodiment of the water heater control method of the present invention.

[0036] In the figure: 10, water tank liner; 11, solar panel; 12, battery; 13, insulation layer; 131, insulation wall; 1311, insulation layer; 1312, transparent layer; 1313, reflective layer; 132, sealing part; 133, adsorption device; 14, power inverter; 141, input end; 142, output end; 143, ground end. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0038] The following is attached with the instruction manual Figures 1 to 8And embodiments 1 to 3 describe in detail the battery-storage water tank, water heater and control method thereof of the present invention.

[0039] Example 1

[0040] This embodiment describes the electric storage water tank of the present invention in detail.

[0041] The battery-storage water tank of this embodiment includes a water tank liner 10, a water tank shell and a battery-storage heat preservation component, such as Figure 1 As shown. Preferably, the water tank liner 10 is used to store water, and the electric storage insulation component includes a solar panel 11, a battery 12, an insulation layer 13 and an electric inverter 14, wherein the insulation layer 13 is located between the water tank liner 10 and the water tank shell, the solar panel 11 is connected to the battery 12, the battery 12 is also connected to the electric inverter 14, and the electric inverter 14 is also electrically connected to the electric heater and water heater unit in the water tank liner 10. Figures 1 to 5 As shown. The water tank shell is Figure 1 Not shown. Figure 1 As shown, the insulation layer 13 is coated on the outer surface of the water tank liner 10 and is in close contact with the outer surface of the water tank liner 10, thereby enhancing the insulation effect of the insulation layer 13. More preferably, the power inverter 14 is used to convert the direct current in the battery into alternating current to power the electric heater and water heater unit within the water tank liner 10. The solar panel 11 can be a structure known in the art. The solar panel 11 converts solar energy into electrical energy and stores it in the battery 12.

[0042] In order to maximize the capacity of the battery-storage water tank, users can install the solar panel 11 in a location with longer sunlight hours, such as a balcony, rooftop, or on the exterior wall of a building if conditions permit, to ensure that the solar panel 11 receives sunlight to the greatest extent possible and achieves maximum power storage.

[0043] The battery-storage water tank of this embodiment converts solar energy into electrical energy through the functions of the solar panel 11, the battery 12, and the power inverter 14. This energy is then supplied to the electric heater and water heater unit within the water tank liner 10, thereby saving electricity. The thermal insulation layer 13 also keeps the water within the water tank liner 10 warm. In other words, the battery-storage water tank of this embodiment not only stores water and keeps it warm, but also stores electricity, reducing energy consumption and improving user experience. This solves the technical problem of conventional water heater tanks having a single function and a poor user experience.

[0044] According to a preferred embodiment, the insulation layer 13 includes an insulation wall 131, the cross section of the insulation wall 131 is formed into an annular cavity, and the annular cavity is in a vacuum state, such as Figure 5As shown. Preferably, the shape of the inner surface of the annular cavity matches the shape of the outer surface of the water tank liner 10, so that the insulation wall 131 can fit the water tank liner 10. The foam insulation layer in the prior art mainly relies on the foaming material to block the contact heat conduction to insulate the water tank liner 10, while the insulation principle of the insulation layer 13 of the present application is different from that of the prior art. Specifically, in the battery-type water tank of the preferred technical solution of this embodiment, the insulation layer 13 includes an insulation wall 131, the cross section of the insulation wall 131 is formed into an annular cavity, and the annular cavity is in a vacuum state. Since the annular cavity is in a vacuum state, the heat conduction effect of the air can be eliminated, thereby playing a role of insulation.

[0045] According to a preferred embodiment, the cross section of the heat-insulating wall 131 is formed into an annular cavity with a gap, and both ends of the annular cavity have sealing portions 132, such as Figure 5 As shown. Preferably, the size of the notch of the annular cavity is determined based on the width of the portion of the water tank liner 10 for installing the pipeline. Preferably, the sealing portion 132 is a heat-sealing portion. In the battery-storable water tank of the preferred technical solution of this embodiment, the cross-section of the insulation wall 131 is formed as an annular cavity with a notch. The notch portion not only makes way for the portion of the water tank liner 10 for installing the pipeline, but also makes the insulation wall 131 elastic, so as to facilitate the installation of the insulation layer. On the other hand, both ends of the annular cavity have sealing portions 132, and the sealing portions 132 can keep the annular cavity in a vacuum state, thereby ensuring the insulation effect of the insulation layer 13.

[0046] According to a preferred embodiment, the thermal insulation layer 13 further includes an adsorption device 133, which is placed in the annular cavity and is used to adsorb gaseous substances in the annular cavity, such as Figure 5 As shown. Preferably, the adsorption device 133 is made of a porous adsorption material, such as the adsorption device 133 is a zeolite molecular sieve. Preferably, there are multiple adsorption devices 133, and the multiple adsorption devices 133 are evenly distributed in the annular cavity. More preferably, there are 3 adsorption devices 133. In the battery-storage water tank of the preferred technical solution of this embodiment, the adsorption device 133 is placed in the annular cavity. Through the action of the adsorption device 133, the gaseous substances including air in the annular cavity can be adsorbed, so that the annular cavity can maintain a vacuum state for a long time, thereby ensuring the thermal insulation effect of the thermal insulation layer 13.

[0047] According to a preferred embodiment, the battery 12 is built into the annular cavity, and the insulation wall 131 includes an insulating layer 1311, a transparent layer 1312 and a reflective layer 1313 in sequence from the side close to the battery 12 to the side away from the battery 12. Figure 5 and Figure 6As shown. Preferably, the insulating layer 1311 is a rubber layer; the transparent layer 1312 is a kraft paper layer; the reflective layer 1313 is a plastic heat-sealing layer, and the inner layer of the plastic heat-sealing layer is a plastic sheet, and the surface of the plastic sheet is provided with an aluminum film coating. In the battery-storage water tank of the preferred technical solution of this embodiment, when installing the thermal insulation layer 13, the annular cavity can be evacuated, and then a plastic heat-sealing layer can be provided on the kraft paper layer. Not limited to this, the thermal insulation layer 13 can also be installed by other methods. In the battery-storage water tank of the preferred technical solution of this embodiment, the battery 12 is built into the annular cavity, which saves more space than the existing ordinary batteries, and the battery 12 is placed in the annular cavity, which can block heat conduction, thereby further ensuring the thermal insulation effect of the thermal insulation layer 13. On the other hand, in the battery-powered water tank of the preferred technical solution of this embodiment, the insulation wall 131 includes an insulating layer 1311, a transparent layer 1312 and a reflective layer 1313 in sequence. The insulating layer 1311 can play an insulating role to prevent the battery 12 in the annular cavity from leaking electricity and causing safety hazards; when the insulation layer 13 is evacuated, the gas in the annular cavity can be better extracted through the transparent layer 1312, thereby ensuring the vacuum degree in the annular cavity; the reflective layer 1313 can reflect the heat emitted by the water tank inner liner 10 back, thereby further ensuring the insulation effect of the insulation layer 13. Furthermore, the reflective layer 1313 is a plastic heat-sealing layer, and the inner layer of the plastic heat-sealing layer is a plastic sheet, and an aluminum film coating is provided on the surface of the plastic sheet. On the one hand, the plastic heat-sealing layer has certain support and thermoplasticity, and can play a sealing and pressure role after heat sealing, thereby further ensuring the vacuum degree in the annular cavity and ensuring the thermal insulation effect of the thermal insulation layer 13; on the other hand, through the effect of the aluminum film coating, the heat emitted by the water tank liner 10 can be reflected back, thereby further ensuring the thermal insulation effect of the thermal insulation layer 13.

[0048] According to a preferred embodiment, the power inverter 14 has an input terminal 141, an output terminal 142 and a ground terminal 143, wherein the input terminal 141 is electrically connected to the battery 12, the output terminal 142 is electrically connected to the electric heater and the water heater unit in the water tank liner 10, and the ground terminal 143 is connected to the ground wire. Figure 4 As shown in the figure, the battery-powered water tank of the preferred technical solution of this embodiment has an input terminal 141 electrically connected to the battery 12, and an output terminal 142 electrically connected to the electric heater and water heater unit within the water tank inner tank 10. Thus, the power inverter 14 can convert the direct current in the battery into alternating current, which is then supplied to the electric heater and water heater unit within the water tank inner tank 10. Furthermore, the power inverter 14 also has a ground terminal 143, which is connected to a grounding wire to prevent safety hazards caused by current leakage.

[0049] Example 2

[0050] This embodiment describes the water heater of the present invention in detail.

[0051] The water heater of this embodiment includes the electric storage water tank of any one of the technical solutions in Example 1. The remaining structure of the water heater can be the same as that of the prior art and will not be described in detail here.

[0052] The water heater of this embodiment includes a chargeable water tank according to any one of the technical solutions in Example 1, so that the water heater of this embodiment not only has the function of storing water and keeping it warm, but also can convert solar energy into electrical energy and supply it to the electric heater and water heater unit in the water tank inner tank 10, thereby saving electricity and improving user experience.

[0053] Example 3

[0054] This embodiment describes in detail the control method of the water heater of the present invention.

[0055] Figure 7 FIG. 1 is a flow chart showing the control method of the water heater of this embodiment. Figure 7 As shown, the control method of the water heater of any technical solution in Example 2 includes the following steps:

[0056] Step 1: Obtain the real-time water temperature in the water tank liner 10 and the operating status of the water heater unit. Specifically, the real-time water temperature in the water tank liner 10 can be obtained by a temperature sensor provided in the water tank liner 10.

[0057] Step 2: Compare the real-time water temperature in the water tank liner 10 with the preset water temperature.

[0058] Step 3: Based on the comparison result between the real-time water temperature in the water tank inner tank 10 and the preset water temperature and the operating status of the water heater unit, control the power inverter 14 to be electrically connected to the electric heater in the water tank inner tank 10, or control the power inverter 14 to be electrically connected to the water heater unit.

[0059] The control method of the water heater of any technical solution in Example 2 includes obtaining the real-time water temperature in the water tank inner tank 10 and the operating status of the water heater unit, comparing the real-time water temperature in the water tank inner tank 10 with the preset water temperature, and based on the comparison result of the real-time water temperature in the water tank inner tank 10 with the preset water temperature and the operating status of the water heater unit, controlling the power inverter 14 to be electrically connected to the electric heater in the water tank inner tank 10, or controlling the power inverter 14 to be electrically connected to the water heater unit, so that the water heater not only has the function of storing water and keeping it warm, but also can convert solar energy into electrical energy, and supply it to the electric heater in the water tank inner tank 10 and the water heater unit for use, thereby saving electricity and improving user experience.

[0060] According to a preferred embodiment, when the water heater unit is in operation, the power inverter 14 is controlled to be electrically connected to the water heater unit, and when the real-time water temperature in the water tank inner tank 10 is greater than or equal to the first preset water temperature, the water heater unit is controlled to be in the off state, and at the same time, the power inverter 14 is controlled to be electrically connected to the electric heater in the water tank inner tank 10; when the water heater unit is in the off state and the real-time water temperature in the water tank inner tank 10 is less than the second preset water temperature, the power inverter 14 is controlled to be electrically connected to the electric heater in the water tank inner tank 10.

[0061] like Figure 8 As shown, the control method of the water heater of the preferred technical solution of this embodiment is as follows: when the water heater unit is in operation, the power inverter 14 is controlled to be electrically connected to the water heater unit. The power inverter 14 transmits electrical energy to the water heater unit power supply to assist the water heater unit in operation, which can save electricity to a certain extent. When the water heater unit heats the water in the water tank liner 10 to a temperature exceeding a first preset water temperature (the first preset water temperature is, for example, 45°C), the water heater unit is shut down. At the same time, the power inverter 14 is controlled to be electrically connected to the electric heater in the water tank liner 10. The power inverter 14 transmits electrical energy to the electric heater in the water tank liner 10. While the water in the water tank liner 10 is kept warm by the insulation layer 13, the water in the water tank liner 10 can be continuously heated by the electric heater to maintain the water temperature within the preset range, thereby ensuring a longer-lasting insulation effect of the water tank. Compared with the water tank with foam insulation layer, the extra insulation time of the electric storage water tank in Example 1 is completely free of charge, and all of it is provided by solar energy. Moreover, the entire water tank can not only enhance the insulation effect through the insulation layer 13, but also store electricity and save energy. The "thermoelectric dual storage" greatly improves the user experience.

[0062] See again Figure 8 In the control method of the water heater of the preferred technical solution of this embodiment, when the water heater unit is in the off state and the real-time water temperature in the water tank liner 10 is lower than the second preset water temperature (the second preset water temperature is, for example, 35°C), the power inverter 14 is controlled to be electrically connected to the electric heater in the water tank liner 10. The power inverter 14 transmits electric energy to the electric heater in the water tank liner 10, which can continuously preheat the water in the water tank liner 10, which is equivalent to indirectly increasing the water inlet temperature, so that the water in the water tank liner 10 can reach the preset value more quickly after the unit is running.

[0063] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0064] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0065] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An electric storage water tank, characterized in that: The invention comprises a water tank liner (10), a water tank shell and an electrically storable heat-insulating component, wherein the water tank liner (10) is used to store water, and the electrically storable heat-insulating component comprises a solar panel (11), a storage battery (12), an insulation layer (13) and an electric power inverter (14), wherein: The thermal insulation layer (13) is located between the water tank inner liner (10) and the water tank outer shell, the solar panel (11) is connected to the battery (12), the battery (12) is also connected to the power inverter (14), and the power inverter (14) is also electrically connected to the electric heater and water heater unit in the water tank inner liner (10); The thermal insulation layer (13) comprises a thermal insulation wall (131), the cross section of the thermal insulation wall (131) is formed into an annular cavity, and the annular cavity is in a vacuum state; The battery (12) is built into the annular cavity, and the thermal insulation wall (131) comprises an insulating layer (1311), a transparent layer (1312), and a reflective layer (1313) in sequence from a side close to the battery (12) to a side away from the battery (12).

2. The electric storage water tank according to claim 1, characterized in that: The cross section of the heat-insulating wall (131) is formed into an annular cavity with a notch, and both ends of the annular cavity have sealing portions (132).

3. The electric storage water tank according to claim 1, characterized in that: The thermal insulation layer (13) further comprises an adsorption device (133), wherein the adsorption device (133) is placed in the annular cavity, and the adsorption device (133) is used to adsorb gaseous substances in the annular cavity.

4. The electric storage water tank according to claim 1, characterized in that: The insulating layer (1311) is a rubber layer; the transparent layer (1312) is a kraft paper layer; the reflective layer (1313) is a plastic heat-sealing layer, and the inner layer of the plastic heat-sealing layer is a plastic sheet, and the surface of the plastic sheet is provided with an aluminum film coating.

5. The electrically rechargeable water tank according to claim 1, characterized in that: The power inverter (14) has an input terminal (141), an output terminal (142), and a ground terminal (143), wherein the input terminal (141) is electrically connected to the battery (12), the output terminal (142) is electrically connected to the electric heater and the water heater unit in the water tank inner tank (10), and the ground terminal (143) is connected to a grounding wire.

6. A water heater, characterized in that: The invention comprises the electrically storable water tank according to any one of claims 1 to 5.

7. A method for controlling a water heater according to claim 6, characterized in that: The steps include: Obtaining the real-time water temperature in the water tank (10) and the operating status of the water heater unit; Comparing the real-time water temperature in the water tank liner (10) with the preset water temperature; Based on the comparison result between the real-time water temperature in the water tank inner tank (10) and the preset water temperature and the operating state of the water heater unit, the power inverter (14) is controlled to be electrically connected to the electric heater in the water tank inner tank (10), or the power inverter (14) is controlled to be electrically connected to the water heater unit.

8. The water heater control method according to claim 7, characterized in that: When the water heater unit is in an operating state, the power inverter (14) is controlled to be electrically connected to the water heater unit, and when the real-time water temperature in the water tank inner tank (10) is greater than or equal to a first preset water temperature, the water heater unit is controlled to be in an off state, and at the same time, the power inverter (14) is controlled to be electrically connected to the electric heater in the water tank inner tank (10); When the water heater unit is in a closed state and the real-time water temperature in the water tank inner tank (10) is lower than the second preset water temperature, the power inverter (14) is controlled to be electrically connected to the electric heater in the water tank inner tank (10).

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