Household energy storage device

Abstract

The invention provides a household energy storage device which comprises a battery, an energy storage converter and a liquid cooling system, the liquid cooling system comprises a compressor, a condenser and a heat exchanger, the first end of the condenser is connected with the first end of the compressor, the first end of the heat exchanger is connected with the second end of the condenser, and the second end of the condenser is connected with the second end of the heat exchanger. The second end of the heat exchanger is connected with the second end of the compressor; the heat exchanger exchanges heat with the battery and the energy storage converter.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage equipment, and in particular, relates to an energy storage device for households. Background Art

[0002] For the battery packs in household energy storage devices, when the ambient temperature is relatively harsh, the service life of the battery packs will be reduced, thus affecting user usage. Summary of the invention

[0003] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0004] In view of this, in a first aspect, the present invention proposes a household energy storage device, which includes: a battery, an energy storage converter and a liquid cooling system, and the liquid cooling system includes: a compressor, a condenser, and a first end of the condenser is connected to a first end of the compressor; a heat exchanger, and a first end of the heat exchanger is connected to a second end of the condenser, and a second end of the heat exchanger is connected to a second end of the compressor; the heat exchanger is used for heat exchange with the battery and the energy storage converter.

[0005] When the ambient temperature is high, battery overheating will affect the safety of battery use. In this case, the battery transfers heat to the liquid cooling system through a heat exchanger, so that the liquid cooling system can dissipate heat from the battery and allow the battery to operate at a suitable temperature, which is beneficial to extend the battery life, improve the battery's working efficiency, ensure the battery's stability of use, and provide convenience for users.

[0006] The energy storage converter also generates heat during operation. The energy storage converter can transfer the heat to the liquid cooling system through a heat exchanger, thereby dissipating the heat of the energy storage converter through the liquid cooling system.

[0007] The temperature of the refrigerant after passing through the condenser is lower, so that the refrigerant with a lower temperature can exchange heat with the battery or energy storage converter through the heat exchanger. When the compressor is running, the compressor can drive the heat exchanger for efficient heat exchange. By adding a compressor to the household energy storage device, the heat exchange efficiency of the household energy storage device can be improved.

[0008] In addition, the household energy storage device in the above technical solution provided by the present invention may also have the following additional technical features:

[0009] In some technical solutions, optionally, the household energy storage device also includes: a first circuit, the battery is arranged on the first circuit, and the first circuit is connected to the heat exchanger; a second circuit, the energy storage converter is arranged on the second circuit; and a water tank circuit, the water tank circuit is used for heat exchange with the first circuit and the second circuit.

[0010] A circulating liquid circulates in the first circuit and the second circuit respectively. For example, the circulating liquid can be water. The first circuit is connected to the water tank circuit. The circulating liquid in the first circuit can flow into the water tank circuit, thereby cooling the circulating liquid in the first circuit through the water tank circuit, and then cooling the battery. Similarly, the circulating liquid in the second circuit can flow into the water tank circuit, thereby cooling the energy storage converter.

[0011] By adding a water tank loop, the heat exchange method for the battery and the energy storage converter is increased to ensure the operating stability of the battery and the energy storage converter.

[0012] In some technical schemes, optionally, the household energy storage device also includes: a valve body assembly, the valve body assembly is provided with multiple interfaces, the valve body assembly is used to change the connectivity status of the multiple interfaces, the multiple interfaces include: a first interface, a second interface, a third interface, a fourth interface and a fifth interface; wherein, the first end of the first circuit is connected to the first interface, the second end of the first circuit is connected to the second interface, the first end of the second circuit is connected to the third interface, the second end of the second circuit is connected to the fourth interface, the first end of the water tank circuit is connected to the second circuit, and the second end of the water tank circuit is connected to the fifth interface.

[0013] By changing the conduction state of the first circuit, the second circuit and the water tank circuit through the valve body assembly, the operating temperature of the battery and the energy storage converter can be effectively adjusted so that the battery and the energy storage converter operate at a suitable temperature, which is beneficial to extend the battery life, improve the battery's working efficiency, ensure the battery's stability of use, and provide convenience for users.

[0014] In some technical schemes, optionally, the valve body assembly includes: a multi-way valve, which is provided with a first interface, a second interface, a third interface and a sixth interface; a three-way valve, which is provided with a fourth interface, a fifth interface and a seventh interface, and the sixth interface is connected to the seventh interface.

[0015] Some interfaces on the multi-way valve can be interconnected, so that different circuits can be interconnected. The three-way valve is provided with three interfaces, and any two of the three interfaces can be interconnected.

[0016] The multi-way valve and the three-way valve cooperate with each other to connect different circuits, so that the household energy storage device can operate in different modes, which is beneficial to improving the functional stability of the household energy storage device.

[0017] In some technical solutions, optionally, the valve body assembly includes: a five-way valve, and the five-way valve is used to connect at least two interfaces.

[0018] There are 5 interfaces on the five-way valve, namely the first interface, the second interface, the third interface, the fourth interface and the fifth interface. The five-way valve can connect some of the 5 interfaces, so that different circulation loops can work independently or different circulation loops can be connected to work, which can meet the usage requirements in various scenarios.

[0019] Integrating multiple interfaces on a five-way valve can simplify the structure of the household energy storage device and facilitate the modularization of the household energy storage device.

[0020] In some technical solutions, optionally, the household energy storage device further includes: a first pump body, which is arranged on the first circuit; when the household energy storage device operates in the first mode, the first interface and the second interface are connected.

[0021] Driven by the first pump body, the circulating fluid can circulate in the first circuit. By arranging the first pump body on the first circuit, the first circuit can realize independent circulation.

[0022] When the first interface is connected to the second interface, the first circuit is in a closed circuit state, and the circulating fluid can circulate in the first circuit.

[0023] When the temperature inside the battery is relatively high, for example, the temperature difference inside the battery is greater than 5°C, the self-circulation mode, i.e., the first mode, can be executed. At this time, the circulating fluid in the first circuit circulates. As the circulating fluid flows through the battery, the temperature of various parts of the battery can be evenly distributed, eliminating the temperature difference on the battery, thereby ensuring the operating stability of the battery.

[0024] In some technical solutions, optionally, the household energy storage device also includes: an expansion kettle, which is arranged on the first circuit.

[0025] In some technical solutions, optionally, the household energy storage device also includes: a second pump body, arranged on the second circuit; when the household energy storage device operates in the second mode, the first interface and the third interface are connected, and the second interface and the fifth interface are connected.

[0026] When the first interface is connected to the third interface, and the second interface is connected to the fifth interface, the water tank loop can dissipate heat for the first loop and the second loop. The water tank loop can dissipate heat for the first loop and the second loop at the same time, thereby simplifying the structure of the household energy storage device.

[0027] A second pump body is arranged on the second circuit so that the second circuit can realize independent circulation.

[0028] In some technical solutions, optionally, when the household energy storage device operates in the third mode, the first interface and the third interface are connected, and the second interface and the fourth interface are connected.

[0029] When the ambient temperature is low, the operating power of the battery will decrease and the battery life will also be affected. The second circuit will generate heat during operation. Therefore, when the temperature of the battery is low, the first circuit and the second circuit can be connected so that the heat in the second circuit can be used to heat the battery, thereby increasing the operating temperature of the battery.

[0030] In some technical solutions, optionally, when the household energy storage device operates in the fourth mode, the first interface and the second interface are connected, and the third interface and the fifth interface are connected.

[0031] Pump bodies are provided in both the first circuit and the second circuit. When the household energy storage device operates in the fourth mode, the first circuit can be cooled by the liquid cooling system, and the second circuit can be cooled by the water tank circuit, so that the battery and the energy storage converter can be cooled independently, which is beneficial to improving the cooling effect.

[0032] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1 A schematic diagram showing a household energy storage device in a self-circulation mode in an embodiment of the present invention is shown;

[0035] Figure 2 A schematic diagram showing a household energy storage device in a series cooling mode in an embodiment of the present invention is shown;

[0036] Figure 3 A schematic diagram showing an embodiment of the present invention in which a household energy storage device is in a cooling mode;

[0037] Figure 4 A schematic diagram showing an embodiment of the present invention in which a household energy storage device is in a low-temperature heating mode;

[0038] Figure 5 A schematic diagram showing the connection between a five-way valve and multiple circuits in an embodiment of the present invention is shown;

[0039] Figure 6 A schematic structural diagram of a condensation assembly in an embodiment of the present invention is shown.

[0040] Reference numerals:

[0041] 110 valve body assembly, 111 first interface, 112 second interface, 113 third interface, 114 fourth interface, 115 fifth interface, 116 five-way valve, 117 multi-way valve, 118 three-way valve, 120 battery, 131 first circuit, 132 heat exchanger, 133 expansion kettle, 134 first pump body, 141 second circuit, 142 energy storage converter, 143 second pump body, 150 water tank circuit, 151 water tank, 152 fourth circuit, 161 third circuit, 163 condenser, 164 fan, 165 compressor, 166 electronic expansion valve, 171 three-way interface, 172 sixth interface, 173 seventh interface, 180 liquid cooling system. DETAILED DESCRIPTION

[0042] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0044] Refer to the following Figures 1 to 6 A household energy storage device provided according to some embodiments of the present invention is described.

[0045] like Figure 1 As shown, in an embodiment of the present invention, a household energy storage device is proposed, which includes: a battery 120, an energy storage converter 142 and a liquid cooling system 180, the liquid cooling system 180 includes: a compressor 165, a condenser 163 and a heat exchanger 132, the first end of the condenser 163 is connected to the first end of the compressor 165, the first end of the heat exchanger 132 is connected to the second end of the condenser 163, the second end of the heat exchanger 132 is connected to the second end of the compressor 165, and the heat exchanger 132 is used for heat exchange with the battery 120 and the energy storage converter 142.

[0046] When the ambient temperature is high, overheating of the battery 120 will affect the safety of the battery 120. In this case, the battery 120 transfers heat to the liquid cooling system 180 through the heat exchanger 132, so that the liquid cooling system 180 can dissipate heat from the battery 120, allowing the battery 120 to operate at a suitable temperature, which is beneficial to extend the service life of the battery 120, improve the working efficiency of the battery 120, ensure the stability of the battery 120, and provide convenience for users.

[0047] The energy storage converter 142 also generates heat during operation. The energy storage converter 142 can transfer the heat to the liquid cooling system 180 through the heat exchanger 132 , so that the energy storage converter 142 is cooled by the liquid cooling system 180 .

[0048] The temperature of the refrigerant after passing through the condenser 163 is relatively low, so that the refrigerant with a relatively low temperature can exchange heat with the battery 120 or the energy storage converter 142 through the heat exchanger 132. When the compressor 165 is running, the compressor 165 can drive the heat exchanger 132 to perform efficient heat exchange. By adding the compressor 165 to the household energy storage device, the heat exchange efficiency of the household energy storage device can be improved.

[0049] In a possible application, the household energy storage device further includes a third loop 161, a compressor 165, a condenser 163 and a heat exchanger 132 are arranged on the third loop 161, and an electronic expansion valve 166 is also arranged on the third loop 161, and the electronic expansion valve 166 is located between the condenser 163 and the heat exchanger 132. Figure 6 As shown, the household energy storage device further includes a fan 164 , and the fan 164 is used to dissipate heat from the condenser 163 .

[0050] like Figure 1 As shown, in some embodiments, optionally, the household energy storage device also includes: a first loop 131, a second loop 141 and a water tank loop 150, the battery 120 is arranged on the first loop 131, the first loop 131 is connected to the heat exchanger 132, the energy storage converter 142 is arranged on the second loop 141, and the water tank loop 150 is used for heat exchange with the first loop 131 and the second loop 141.

[0051] A circulating liquid circulates in the first loop 131 and the second loop 141, respectively. For example, the circulating liquid may be water. The first loop 131 is connected to the water tank loop 150. The circulating liquid in the first loop 131 may flow into the water tank loop 150, thereby cooling the circulating liquid in the first loop 131 through the water tank loop 150, and further cooling the battery 120. Similarly, the circulating liquid in the second loop 141 may flow into the water tank loop 150, thereby cooling the energy storage converter 142.

[0052] By adding the water tank loop 150 , the heat exchange mode for the battery 120 and the energy storage converter 142 is increased, thereby ensuring the operating stability of the battery 120 and the energy storage converter 142 .

[0053] The water tank circuit 150 includes a water tank 151 and a fourth circuit 152 , and the water tank 151 is disposed on the fourth circuit 152 .

[0054] Combination Figure 1 and Figure 5As shown, in some embodiments, optionally, the household energy storage device further includes: a valve body assembly 110, the valve body assembly 110 is provided with a plurality of interfaces, and the valve body assembly 110 is used to change the connection state of the plurality of interfaces. The plurality of interfaces include: a first interface 111, a second interface 112, a third interface 113, a fourth interface 114, and a fifth interface 115. The first end of the first loop 131 is connected to the first interface 111, the second end of the first loop 131 is connected to the second interface 112, the first end of the second loop 141 is connected to the third interface 113, the second end of the second loop 141 is connected to the fourth interface 114, the first end of the water tank loop 150 is connected to the second loop 141, and the second end of the water tank loop 150 is connected to the fifth interface 115.

[0055] By changing the conduction state of the first circuit 131, the second circuit 141 and the water tank circuit 150 through the valve body assembly 110, the operating temperature of the battery 120 and the energy storage converter 142 can be effectively adjusted, so that the battery 120 and the energy storage converter 142 operate at a suitable temperature, which is beneficial to extend the service life of the battery 120, improve the working efficiency of the battery 120, ensure the stability of the use of the battery 120, and provide convenience for users.

[0056] like Figure 1 As shown, in some embodiments, optionally, the valve body assembly 110 includes: a multi-way valve 117 and a three-way valve 118, the multi-way valve 117 is provided with a first interface 111, a second interface 112, a third interface 113 and a sixth interface 172, the three-way valve 118 is provided with a fourth interface 114, a fifth interface 115 and a seventh interface 173, and the sixth interface 172 is connected to the seventh interface 173.

[0057] Some interfaces on the multi-way valve 117 can be interconnected, so that different circuits can be interconnected. The three-way valve 118 is provided with three interfaces, and any two of the three interfaces can be interconnected.

[0058] The multi-way valve 117 and the three-way valve 118 cooperate with each other to connect different circuits, so that the household energy storage device can operate in different modes, which is beneficial to improving the functional stability of the household energy storage device.

[0059] A three-way interface 171 is provided between the fourth circuit 152 and the second circuit 141 , two interfaces of the three-way interface 171 are respectively connected to the fourth circuit and the second circuit 141 , and the third interface of the three-way interface 171 is connected to the three-way valve 118 .

[0060] like Figure 5 As shown, in some embodiments, optionally, the valve body assembly 110 includes: a five-way valve 116, and the five-way valve 116 is used to connect at least two interfaces.

[0061] There are five interfaces on the five-way valve 116, namely the first interface 111, the second interface 112, the third interface 113, the fourth interface 114 and the fifth interface 115. The five-way valve 116 can connect some of the five interfaces, so that different circulation loops can work independently or different circulation loops can be connected to work, which can meet the usage requirements in various scenarios.

[0062] Integrating multiple interfaces on a five-way valve 116 can simplify the structure of the household energy storage device, which is conducive to the modularization of the household energy storage device.

[0063] like Figure 1 As shown, in some embodiments, optionally, the household energy storage device further includes: a first pump body 134, and the first pump body 134 is arranged on the first loop 131. When the household energy storage device operates in the first mode, the first interface 111 and the second interface 112 are connected.

[0064] Driven by the first pump body 134 , the circulating fluid can circulate in the first circuit 131 . By arranging the first pump body 134 on the first circuit 131 , the first circuit 131 can realize independent circulation.

[0065] When the first interface 111 and the second interface 112 are connected, the first circuit 131 is in a closed circuit state, and the circulating fluid can circulate in the first circuit 131 .

[0066] When the temperature inside the battery 120 is relatively high, for example, the temperature difference inside the battery 120 is greater than 5°C, the self-circulation mode, i.e., the first mode, can be executed. At this time, the circulating fluid in the first loop 131 circulates. As the circulating fluid flows through the battery 120, the temperature of various parts of the battery 120 can be evenly distributed, eliminating the temperature difference on the battery 120, thereby ensuring the operating stability of the battery 120.

[0067] like Figure 1 As shown, in some embodiments, optionally, the household energy storage device further includes: an expansion kettle 133 , and the expansion kettle 133 is arranged on the first circuit 131 .

[0068] An expansion kettle 133 is installed on the first circuit 131. When the internal temperature of some circuits in the household energy storage device is high, the liquid in some circuits will expand due to the increase in temperature. At this time, part of the liquid can flow into the expansion kettle 133 to play a buffering role. Moreover, the expansion kettle 133 can also replenish the various circuits in the household energy storage device to ensure the operating stability of each circuit of the household energy storage device.

[0069] Combination Figure 1 and Figure 2As shown, in some embodiments, optionally, the household energy storage device further includes: a second pump body 143, and the second pump body 143 is arranged on the second loop 141. When the household energy storage device operates in the second mode, the first interface 111 and the third interface 113 are connected, and the second interface 112 and the fifth interface 115 are connected.

[0070] When the first interface 111 is connected to the third interface 113, and the second interface 112 is connected to the fifth interface 115, the water tank loop 150 can dissipate heat for the first loop 131 and the second loop 141. The water tank loop 150 can dissipate heat for the first loop 131 and the second loop 141 at the same time, thereby simplifying the structure of the household energy storage device.

[0071] A second pump body 143 is provided on the second circuit 141 so that the second circuit 141 can realize independent circulation.

[0072] like Figure 4 As shown, in some embodiments, optionally, when the household energy storage device operates in the third mode, the first interface 111 and the third interface 113 are connected, and the second interface 112 and the fourth interface 114 are connected.

[0073] When the ambient temperature is low, the operating power of the battery 120 will decrease and the service life of the battery 120 will also be affected, and the second circuit 141 will generate heat during operation. Therefore, when the temperature of the battery 120 is low, the first circuit 131 and the second circuit 141 can be connected so that the heat in the second circuit 141 can be used to heat the battery 120, thereby increasing the operating temperature of the battery 120.

[0074] Combination Figure 1 and Figure 3 As shown, in some embodiments, optionally, when the household energy storage device operates in the fourth mode, the first interface 111 and the second interface 112 are connected, and the third interface 113 and the fifth interface 115 are connected.

[0075] Pump bodies are provided in both the first circuit 131 and the second circuit 141. When the household energy storage device operates in the fourth mode, the first circuit 131 can be cooled by the liquid cooling system 180, and the second circuit 141 can be cooled by the water tank circuit 150, so that the battery 120 and the energy storage converter 142 can be cooled independently, which is beneficial to improving the cooling effect.

[0076] Through the household energy storage device in the above embodiment, the battery 120 can be used without power limit in the ambient temperature range of -30°C to 55°C, and the life of the battery 120 can be improved. The self-circulation mode can quickly eliminate the temperature difference inside the battery 120 and improve the operating efficiency of the battery 120. The energy storage converter 142 and the battery 120 can be cooled independently, thereby eliminating "confluence" and simplifying the control strategy of the household energy storage device.

[0077] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0078] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A household energy storage device, characterized in that: It includes a battery, an energy storage converter and a liquid cooling system, wherein the liquid cooling system includes: compressor; a condenser, a first end of the condenser being connected to a first end of the compressor; a heat exchanger, wherein a first end of the heat exchanger is connected to a second end of the condenser, and a second end of the heat exchanger is connected to a second end of the compressor; The heat exchanger is used for heat exchange with the battery and the energy storage converter.

2. The household energy storage device according to claim 1, characterized in that: The household energy storage device also includes: a first circuit, the battery being arranged on the first circuit, the first circuit being connected to the heat exchanger; A second circuit, the energy storage converter is arranged on the second circuit; A water tank circuit, wherein the water tank circuit is used for heat exchange with the first circuit and the second circuit.

3. The household energy storage device according to claim 2, characterized in that: The household energy storage device also includes: A valve body assembly, wherein the valve body assembly is provided with a plurality of interfaces, and the valve body assembly is used to change the connection state of the plurality of interfaces, wherein the plurality of interfaces include: a first interface, a second interface, a third interface, a fourth interface and a fifth interface; Among them, the first end of the first loop is connected to the first interface, the second end of the first loop is connected to the second interface, the first end of the second loop is connected to the third interface, the second end of the second loop is connected to the fourth interface, the first end of the water tank loop is connected to the second loop, and the second end of the water tank loop is connected to the fifth interface.

4. The household energy storage device according to claim 3, characterized in that: The valve body assembly comprises: A multi-way valve, wherein the multi-way valve is provided with the first interface, the second interface, the third interface and the sixth interface; A three-way valve is provided with the fourth interface, the fifth interface and the seventh interface, and the sixth interface is connected to the seventh interface.

5. The household energy storage device according to claim 3, characterized in that: The valve body assembly comprises: A five-way valve is used to connect at least two of the interfaces.

6. The household energy storage device according to any one of claims 3 to 5, characterized in that: The household energy storage device also includes: A first pump body, arranged on the first circuit; When the household energy storage device operates in the first mode, the first interface and the second interface are connected.

7. The household energy storage device according to any one of claims 2 to 5, characterized in that: The household energy storage device also includes: An expansion kettle is arranged on the first circuit.

8. The household energy storage device according to any one of claims 3 to 5, characterized in that: The household energy storage device also includes: A second pump body, arranged on the second circuit; When the household energy storage device operates in the second mode, the first interface is connected to the third interface, and the second interface is connected to the fifth interface.

9. The household energy storage device according to any one of claims 3 to 5, characterized in that: When the household energy storage device operates in the third mode, the first interface is connected to the third interface, and the second interface is connected to the fourth interface.

10. The household energy storage device according to any one of claims 3 to 5, characterized in that: When the household energy storage device operates in the fourth mode, the first interface is connected to the second interface, and the third interface is connected to the fifth interface.

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