Energy storage unit, energy storage device and energy storage battery temperature control system

Abstract

The invention relates to an energy storage unit, an energy storage device and an energy storage battery temperature control system. The energy storage unit comprises a battery, a converter and a liquid cooling plate, the battery is electrically connected with the converter, and the battery and the converter are both connected to the liquid cooling plate and make contact with the liquid cooling plate; the liquid cooling plate is provided with a medium inlet and a medium outlet, the medium inlet is close to the battery, and the medium outlet is close to the converter; the liquid cooling plate is used for being connected with an external heat exchange medium pipeline, and a heat exchange medium in the heat exchange medium pipeline exchanges heat with the battery and then exchanges heat with the converter when entering the liquid cooling plate through the medium inlet, and then flows out of the liquid cooling plate from the medium outlet. The battery and the converter of the energy storage unit share the liquid cooling plate, so that not only is the cost saved, but also the overall volume of the energy storage unit is reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an energy storage unit, an energy storage device, and an energy storage battery temperature control system. Background Technology

[0002] Existing energy storage devices have significant shortcomings in thermal management design. On the one hand, in order to cope with changes in ambient temperature, energy storage batteries need to be equipped with dedicated temperature control devices, which increases material costs. On the other hand, the converter, as one of the main heat sources, also requires additional heat dissipation structures, which further increases costs and occupies valuable internal space. Summary of the Invention

[0003] This application provides an energy storage unit, an energy storage device, and an energy storage battery temperature control system.

[0004] In a first aspect, this application provides an energy storage unit, which includes a battery, a converter, and a liquid cooling plate. The battery and the converter are electrically connected, and both the battery and the converter are connected to and in contact with the liquid cooling plate. The liquid cooling plate has a medium inlet and a medium outlet, with the medium inlet located near the battery and the medium outlet located near the converter. The liquid cooling plate is used to connect to an external heat exchange medium pipeline. When the heat exchange medium in the heat exchange medium pipeline enters the liquid cooling plate through the medium inlet, it first exchanges heat with the battery, then with the converter, and then flows out of the liquid cooling plate from the medium outlet.

[0005] In some alternative examples, the liquid cooling plate has a heat exchange plane, on which the battery and converter are arranged side by side, and both the battery and converter are connected to the heat exchange plane by thermally conductive silicone.

[0006] In some optional examples, the energy storage unit also includes a connector, through which both the battery and the converter are fixedly connected to the liquid cooling plate.

[0007] In some alternative examples, the converter includes a base and a heating element, the heating element being disposed on the base, the base being in contact with the heat exchange plane, and the base being made of a highly thermally conductive material.

[0008] In some alternative examples, the liquid cooling plate includes a single medium flow path, which is serpentine in shape, with its two ends connected to a medium inlet and a medium outlet, respectively; or the liquid cooling plate includes multiple straight medium flow paths, which are parallel to each other, with their two ends simultaneously connected to a medium inlet and a medium outlet, respectively.

[0009] In some alternative examples, the energy storage unit also includes a housing, a liquid cooling plate fixed to the bottom of the housing, and the battery and converter arranged side by side on the liquid cooling plate with a gap between them and the housing.

[0010] Secondly, embodiments of this application also provide an energy storage device, including two or more of the above-mentioned energy storage units, wherein the two or more energy storage units are stacked and each energy storage unit is electrically connected to the other.

[0011] In some alternative examples, the energy storage device includes an inlet pipe and an outlet pipe, the inlet pipe being connected to the medium inlet of the liquid cooling plate of two or more energy storage units, and the outlet pipe being connected to the medium outlet of the liquid cooling plate of two or more energy storage units.

[0012] In some optional examples, the liquid inlet pipe includes a main liquid inlet pipe and multiple liquid inlet branch pipes, which are connected to the main liquid inlet pipe at intervals. The multiple liquid inlet branch pipes are configured one-to-one with the liquid cooling plates of multiple energy storage units, and the liquid inlet branch pipes are connected to the medium inlet of the corresponding liquid cooling plate. The liquid outlet pipe includes a main liquid outlet pipe and multiple liquid outlet branch pipes, which are connected to the main liquid outlet pipe at intervals. The multiple liquid outlet branch pipes are configured one-to-one with the liquid cooling plates of multiple energy storage units, and the liquid outlet branch pipes are connected to the medium outlet of the corresponding liquid cooling plate.

[0013] Thirdly, this application also provides an energy storage battery temperature control system, including an air conditioning heat pump main unit, an air conditioning heat pump main unit, and the aforementioned energy storage device. The terminal indoor unit is connected to the air conditioning heat pump main unit via a heat exchange medium pipeline. The liquid cooling plate of the energy storage device is connected to the heat exchange medium pipeline and, through the heat exchange medium pipeline, to the air conditioning heat pump main unit. The air conditioning heat pump main unit is used to deliver a cooling heat exchange medium to the terminal indoor unit and the liquid cooling plate during cooling mode, and also to deliver a heating heat exchange medium to the terminal indoor unit and the liquid cooling plate during heating mode.

[0014] In the energy storage unit provided in this application, both the battery and the converter are connected to and in contact with a liquid cooling plate, allowing the liquid cooling plate to jointly regulate the temperature of both the battery and the converter. In high-temperature summer conditions, external heat exchange medium pipelines supply cooling medium to the liquid cooling plate, which in turn cools the battery and converter to ensure safety. In extremely low-temperature winter conditions, external heat exchange medium pipelines supply heating medium to the liquid cooling plate, which in turn heats the battery and the converter to maintain performance. In non-extreme low-temperature winter conditions, the heat exchange medium within the liquid cooling plate can recover heat from the converter to heat the battery. The energy storage unit provided in this application uses a shared liquid cooling plate for both the battery and the converter, eliminating the need for a separate heat dissipation structure for the converter, thus saving costs and reducing the overall size of the energy storage unit.

[0015] The liquid cooling plate has its inlet close to the battery and its outlet close to the converter, ensuring that the heat exchange medium entering the liquid cooling plate passes through the battery first, then the converter. In high-temperature summer conditions, the heat exchange medium cools the battery first, then the converter, preventing battery overheating and reduced lifespan, prioritizing battery cooling needs. In extremely low-temperature winter conditions, both the battery and converter need heating. The heat exchange medium heats the battery first, then the converter, preventing battery capacity degradation and prioritizing battery heating needs. In non-extremely low-temperature winter conditions, the temperature of the heat exchange medium used for heating is generally lower than the converter temperature. In this case, the battery needs heating while the converter needs cooling. The heat exchange medium entering the liquid cooling plate first heats the battery, lowering its temperature and further increasing the temperature difference with the converter. This allows for better converter cooling, and the increased temperature difference also facilitates the recovery of more heat from the converter for recirculation to the battery. The liquid cooling plate's placement of the inlet close to the battery and the outlet close to the converter significantly improves the temperature regulation effect of the energy storage unit. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the structure of an energy storage unit provided in an embodiment of this application.

[0019] Figure 3 yes Figure 2 The diagram shows the internal structure of the energy storage unit.

[0020] Figure 4 yes Figure 3 A schematic diagram of one embodiment of the liquid cooling plate of the energy storage unit shown.

[0021] Figure 5 yes Figure 4 A schematic diagram of another embodiment of the liquid cooling plate shown.

[0022] Figure 6 yes Figure 1 A schematic diagram of the inlet pipe, outlet pipe, and liquid cooling plate of the energy storage device shown.

[0023] Figure 7This is a structural block diagram of an energy storage battery temperature control system provided in an embodiment of this application.

[0024] Labeling Explanation: 100, Energy Storage Unit; 10, Battery; 30, Converter; 32, Base; 34, Heating Element; 50, Liquid Cooling Plate; 51, Heat Exchange Plane; 52, Medium Inlet; 54, Medium Inlet; 56, Single Medium Flow Path; 58, Straight Medium Flow Path; 70, Housing Shell; 72, Top Plate; 74, Bottom Plate; 76, Side Plate; 90, Connector; 200, Energy Storage Device; 20, Liquid Inlet Pipe; 21, Main Liquid Inlet Pipe; 23, Branch Liquid Inlet Pipe; 40, Liquid Outlet Pipe; 41, Main Liquid Outlet Pipe; 43, Branch Liquid Outlet Pipe; 300, Energy Storage Battery Temperature Control System; 301, Air Conditioning Heat Pump Main Unit; 302, Terminal Indoor Unit; 303, Heat Exchange Medium Piping. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0026] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. For example, the term "comprising" used throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem and basically achieve the technical effect within a certain margin of error.

[0027] Please see Figure 1 This application provides an energy storage unit 100 and an energy storage device 200 configured with the energy storage unit 100. The energy storage device 200 can be applied in fields such as new energy vehicles, energy storage systems, and power supply systems. The energy storage device 200 is used to store electrical energy and perform voltage conversion and power supply stabilization.

[0028] Please also refer to Figure 2 and Figure 3In this embodiment, the energy storage unit 100 may include a battery 10, a converter 30, and a liquid cooling plate 50. The battery 10 and the converter 30 are electrically connected, and both the battery 10 and the converter 30 are connected to and in contact with the liquid cooling plate 50. The liquid cooling plate 50 has a medium inlet 52 and a medium outlet 54. The medium inlet 52 is located near the battery 10, and the medium outlet 54 is located near the converter 30. The liquid cooling plate 50 is used to connect to an external heat exchange medium pipeline 303. When the heat exchange medium in the heat exchange medium pipeline 303 enters the liquid cooling plate 50 through the medium inlet 52, it first exchanges heat with the battery 10, then with the converter 30, and then flows out of the liquid cooling plate 50 from the medium outlet 54.

[0029] The performance and lifespan of battery 10 are susceptible to temperature effects. In the energy storage unit 100 provided in this application, both battery 10 and converter 30 are connected to and in contact with liquid cooling plate 50. Liquid cooling plate 50 can jointly regulate the temperature of battery 10 and converter 30. In high-temperature summer conditions, external heat exchange medium pipeline 303 supplies heat exchange medium to liquid cooling plate 50 to achieve cooling, and liquid cooling plate 50 cools battery 10 and converter 30 to ensure safety. In extremely low-temperature winter conditions, external heat exchange medium pipeline 303 supplies heat exchange medium to liquid cooling plate 50 to achieve heating, and liquid cooling plate 50 heats battery 10 and converter 30 to ensure performance. In non-extreme low-temperature winter conditions, the heat exchange medium inside liquid cooling plate 50 can recover heat from converter 30 to heat battery 10. The energy storage unit 100 provided in this application shares a liquid cooling plate 50 with the battery 10 and the converter 30, eliminating the need for a separate heat dissipation structure for the converter 30, which not only saves costs but also reduces the overall volume of the energy storage unit 100.

[0030] The liquid cooling plate 50 has its medium inlet 52 located near the battery 10 and its medium outlet 54 located near the converter 30. This ensures that the heat exchange medium entering the liquid cooling plate 50 passes through the battery 10 first and then the converter 30. In high-temperature summer conditions, the heat exchange medium cools the battery 10 first and then the converter 30, preventing overheating of the battery 10 and reducing its lifespan, thus prioritizing the cooling needs of the battery 10. In extremely low-temperature winter conditions, both the battery 10 and the converter 30 require heating. The heat exchange medium heats the battery 10 first and then the converter 30, preventing capacity degradation of the battery 10 and prioritizing its heating needs. In non-extreme low-temperature conditions during winter, the temperature of the heat exchange medium used for heating is generally lower than that of the converter 30. At this time, the battery 10 needs heating, while the converter 30 needs cooling. The heat exchange medium entering the liquid cooling plate 50 first heats the battery 10, lowering its temperature and further increasing the temperature difference with the converter 30. This allows for better cooling of the converter 30. Simultaneously, the increased temperature difference facilitates the heat exchange medium recovering more heat from the converter 30 for recirculation to heat the battery 10. The liquid cooling plate 50 of this application, with its medium inlet 52 positioned close to the battery 10 and its medium outlet 54 positioned close to the converter 30, significantly improves the temperature regulation effect on the energy storage unit 100.

[0031] In this embodiment, the energy storage unit 100 may further include a housing 70, with a liquid cooling plate 50 fixed to the bottom of the housing 70. The battery 10 and converter 30 are arranged side-by-side on the liquid cooling plate 50, with a gap between them and the housing 70. This gap between the battery 10 and converter 30 and the housing 70 facilitates airflow and aids in heat dissipation. It also provides space for the expansion of the battery 10 and converter 30, preventing damage due to thermal expansion and contraction. The housing 70 provides excellent protection for the internal components, preventing damage to the battery 10, converter 30, and liquid cooling plate 50 from external factors such as impacts, dust, and moisture. This ensures the stable operation of the energy storage unit 100 in various environments and extends its service life.

[0032] The housing 70 may include a top plate 72, a bottom plate 74, and a side plate 76. The top plate 72 and the bottom plate 74 are arranged at intervals relative to each other, and the side plate 76 is connected between the top plate 72 and the bottom plate 74 along the circumference of the top plate 72. The side plate 76, the top plate 72, and the bottom plate 74 together form a receiving space for accommodating the battery 10, the converter 30, and the liquid cooling plate 50.

[0033] Please also refer to Figure 2 and Figure 4The liquid cooling plate 50 is fixedly connected to the base plate 74, for example, by means of fasteners such as screws. The liquid cooling plate 50 has a medium flow path for the transfer of the heat exchange medium. This specification does not limit the specific type of the medium flow path of the liquid cooling plate 50. As an example, the liquid cooling plate 50 may include a single medium flow path 56, which is a serpentine path, with its two ends connected to a medium inlet 52 and a medium outlet 54, respectively. The serpentine single medium flow path 56 increases the flow path length of the heat exchange medium within the liquid cooling plate 50, thereby enhancing the heat exchange effect and making the temperature regulation of the battery 10 and the converter 30 more uniform and efficient.

[0034] Please see Figure 5 As another example, the liquid cooling plate 50 may include multiple straight medium flow paths 58, which are parallel to each other and connected to a medium inlet 52 and a medium outlet 54 at both ends. This design allows the heat exchange medium to flow in parallel through the multiple straight medium flow paths 58, increasing the flow rate and velocity of the heat exchange medium, thereby enhancing the overall heat dissipation or heating capacity of the liquid cooling plate 50. This specification does not limit the specific type of heat exchange medium; the heat exchange medium can be refrigerant or water.

[0035] Please also refer to Figure 3 and Figure 6 In this embodiment, the liquid cooling plate 50 also has a heat exchange plane 51. The battery 10 and the converter 30 are arranged side by side on the heat exchange plane 51, and the liquid cooling plate 50 regulates the temperature of the battery 10 and the converter 30 through the heat exchange plane 51. This specification does not limit the specific connection method between the battery 10 and the liquid cooling plate 50, or between the converter 30 and the liquid cooling plate 50. As an example, the battery 10 can be connected to the heat exchange plane 51 through thermally conductive silicone, and the converter 30 can also be connected to the heat exchange plane 51 through thermally conductive silicone. Thermally conductive silicone has good thermal conductivity and flexibility, and can fill the tiny gaps between the battery 10, the converter 30 and the liquid cooling plate 50, reduce thermal resistance, and enable heat to be transferred more efficiently between the battery 10, the converter 30 and the liquid cooling plate 50. Moreover, the soft connection method of thermally conductive silicone can also play a certain buffering role, protecting the battery 10 and the converter 30 from damage when the energy storage unit 100 is subjected to vibration or impact, further improving the reliability and stability of the energy storage unit 100.

[0036] To further improve the connection stability between the battery 10, the converter 30, and the liquid cooling plate 50, in this embodiment, the energy storage unit 100 may also include a connector 90. Both the battery 10 and the converter 30 are fixedly connected to the liquid cooling plate 50 via the connector 90. This specification does not limit the specific structure of the connector 90; it can be a screw, bolt, or clip. In this embodiment, the connector 90 is a screw. The fixed connection via the connector 90 ensures the stability of the battery 10 and the converter 30 on the liquid cooling plate 50, maintaining a stable connection even under vibration or impact conditions, thereby guaranteeing the overall performance and safety of the energy storage unit 100.

[0037] The battery 10 and converter 30 are fixed in parallel to the liquid cooling plate 50. This specification does not limit the specific structure of the battery 10. As an example, the battery 10 may include cell packs, and multiple cell packs can be electrically connected in series or parallel to meet different voltage and capacity requirements. Multiple cell packs can improve the overall energy density and energy storage efficiency of the energy storage unit 100, providing more stable and reliable power support for the energy storage device 200. As a key component in the energy storage unit 100, the converter 30's main function is to realize the conversion and stable transmission of electrical energy. The converter 30 can be tightly integrated with the battery 10 and the liquid cooling plate 50 to jointly form a high-efficiency and reliable energy storage unit 100.

[0038] In this specification, the converter 30 may include a base 32 and a heating element 34. The heating element 34 is disposed on the base 32, which is in contact with the heat exchange plane 51. The base 32 is made of a high thermal conductivity material. This high thermal conductivity material can be aluminum, copper, copper alloys, metal-based composite materials, etc. These materials have excellent thermal conductivity and can quickly conduct the heat generated by the heating element 34 to the liquid cooling plate 50, thereby ensuring the temperature stability of the converter 30. In this embodiment, the base 32 is made of aluminum. The close contact between the base 32 and the heat exchange plane 51 further improves the heat transfer efficiency, enabling the converter 30 to operate in a highly efficient and stable state.

[0039] Please refer to it again. Figure 1In this embodiment, the energy storage device 200 may include two or more of the aforementioned energy storage units 100, which are stacked and electrically connected to each other. This stacking arrangement effectively utilizes space and increases the energy density of the energy storage device 200. The electrical connection between each energy storage unit 100 enables efficient transmission and distribution of electrical energy, ensuring stable and reliable operation of the energy storage device 200. Simultaneously, the modular design of the energy storage units 100 makes the expansion and maintenance of the energy storage device 200 more convenient and flexible. In practical applications, the number of energy storage units 100 can be increased or decreased according to specific needs to meet energy storage requirements in different scenarios. In this embodiment, four energy storage units 100 are provided, stacked along a predetermined direction, which is the stacking direction of the battery 10 and the liquid cooling plate 50.

[0040] Please also refer to Figure 1 , Figure 3 and Figure 6 The energy storage device 200 may further include an inlet pipe 20 and an outlet pipe 40. The inlet pipe 20 connects to the medium inlet 52 of the liquid cooling plate 50 of two or more energy storage units 100, and the outlet pipe 40 connects to the medium outlet 54 of the liquid cooling plate 50 of two or more energy storage units 100. The arrangement of the inlet pipe 20 and the outlet pipe 40 enables the circulation of the heat exchange medium among multiple energy storage units 100. The external heat exchange medium pipeline 303 delivers the heat exchange medium to the medium inlet 52 of the liquid cooling plate 50 of each energy storage unit 100 through the inlet pipe 20. After heat exchange with the battery 10 and the converter 30 in the liquid cooling plate 50, the heat exchange medium flows out from the medium outlet 54 and returns to the external heat exchange medium pipeline 303 or heat exchange device through the outlet pipe 40 for re-temperature regulation, thus forming a complete circulation system. This design ensures that each energy storage unit 100 can obtain uniform and effective temperature regulation, improving the performance and stability of the entire energy storage device 200. The layout of the inlet pipe 20 and the outlet pipe 40 can be flexibly adjusted according to actual needs to adapt to energy storage devices 200 of different sizes and layouts.

[0041] In this embodiment, the liquid inlet pipe 20 may include a main liquid inlet pipe 21 and a plurality of branch liquid inlet pipes 23, which are connected to the main liquid inlet pipe 21 at intervals. Each branch liquid inlet pipe 23 corresponds to a liquid cooling plate 50 of a plurality of energy storage units 100, and is connected to the medium inlet 52 of the corresponding liquid cooling plate 50. The liquid outlet pipe 40 may include a main liquid outlet pipe 41 and a plurality of branch liquid outlet pipes 43, which are connected to the main liquid outlet pipe 41 at intervals. Each branch liquid outlet pipe 43 corresponds to a liquid cooling plate 50 of a plurality of energy storage units 100, and is connected to the medium outlet 54 of the corresponding liquid cooling plate 50.

[0042] The main inlet pipe 21 and the branch inlet pipe 23 enable precise delivery of the heat exchange medium to the liquid-cooled plate 50 of each energy storage unit 100, ensuring that each energy storage unit 100 receives a sufficient supply of heat exchange medium, thereby achieving uniform temperature regulation of all energy storage units 100 within the entire energy storage device 200. The main inlet pipe 21 and the main outlet pipe 41, as the main fluid channels, can withstand large fluid pressures and flow rates, ensuring stable flow of the heat exchange medium within the system. The arrangement of multiple branch inlet pipes 23 and branch outlet pipes 43 makes the system more flexible, adaptable to different numbers and layouts of energy storage units 100.

[0043] Please also refer to Figure 3 and Figure 7 This application also provides an energy storage battery temperature control system 300, which may include an air conditioning heat pump main unit 301, a terminal indoor unit 302, and the aforementioned energy storage device 200. The terminal indoor unit 302 is connected to the air conditioning heat pump main unit 301 via a heat exchange medium pipeline 303. The liquid cooling plate 50 of the energy storage device 200 is connected to the heat exchange medium pipeline 303 and is also connected to the air conditioning heat pump main unit 301 via the heat exchange medium pipeline 303. The air conditioning heat pump main unit 301 is used to supply heat exchange medium for cooling to the terminal indoor unit 302 and the liquid cooling plate 50 during cooling mode, and also to supply heat exchange medium for heating to the terminal indoor unit 302 and the liquid cooling plate 50 during heating mode.

[0044] By integrating the air conditioning heat pump host 301, the terminal indoor unit 302, and the energy storage device 200 into one unit in the energy storage battery temperature control system 300, and further delivering the heat exchange medium to the terminal indoor unit 302 and the liquid cooling plate 50 through the cooling or heating mode of the air conditioning heat pump host 301, the temperature of the battery 10 and the converter 30 is regulated. There is no need to equip the energy storage unit 100 with a separate temperature control system, which reduces the manufacturing cost, reduces the volume occupied by the energy storage unit 100, and improves the energy storage utilization rate of the energy storage battery temperature control system 300.

[0045] In the energy storage unit 100 provided in this application, both the battery 10 and the converter 30 are connected to and in contact with the liquid cooling plate 50. The liquid cooling plate 50 can jointly regulate the temperature of the battery 10 and the converter 30. In high-temperature summer conditions, the external heat exchange medium pipeline 303 supplies a cooling medium to the liquid cooling plate 50, which in turn cools the battery 10 and the converter 30 to ensure safety. In extremely low-temperature winter conditions, the external heat exchange medium pipeline 303 supplies a heating medium to the liquid cooling plate 50, which in turn heats the battery 10 and the converter 30 to ensure performance. In non-extreme low-temperature winter conditions, the heat exchange medium within the liquid cooling plate 50 can recover heat from the converter 30 to heat the battery 10. The energy storage unit 100 provided in this application uses the same liquid cooling plate 50 for both the battery 10 and the converter 30, eliminating the need for a separate heat dissipation structure for the converter 30. This not only saves costs but also reduces the overall volume of the energy storage unit 100.

[0046] The liquid cooling plate 50 has its medium inlet 52 located near the battery 10 and its medium outlet 54 located near the converter 30. This ensures that the heat exchange medium entering the liquid cooling plate 50 passes through the battery 10 first and then the converter 30. In high-temperature summer conditions, the heat exchange medium cools the battery 10 first and then the converter 30, preventing overheating of the battery 10 and reducing its lifespan, thus prioritizing the cooling needs of the battery 10. In extremely low-temperature winter conditions, both the battery 10 and the converter 30 require heating. The heat exchange medium heats the battery 10 first and then the converter 30, preventing capacity degradation of the battery 10 and prioritizing its heating needs. In non-extreme low-temperature conditions during winter, the temperature of the heat exchange medium used for heating is generally lower than that of the converter 30. At this time, the battery 10 needs heating, while the converter 30 needs cooling. The heat exchange medium entering the liquid cooling plate 50 first heats the battery 10, lowering its temperature and further increasing the temperature difference with the converter 30. This allows for better cooling of the converter 30. Simultaneously, the increased temperature difference facilitates the heat exchange medium recovering more heat from the converter 30 for recirculation to heat the battery 10. The liquid cooling plate 50 of this application, with its medium inlet 52 positioned close to the battery 10 and its medium outlet 54 positioned close to the converter 30, significantly improves the temperature regulation effect on the energy storage unit 100.

[0047] Terminology Explanation In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inside", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An energy storage unit, characterized in that, The device includes a battery, a converter, and a liquid cooling plate. The battery and the converter are electrically connected and both are connected to and in contact with the liquid cooling plate. The liquid cooling plate has a medium inlet and a medium outlet. The medium inlet is located near the battery, and the medium outlet is located near the converter. The liquid cooling plate is used to connect to an external heat exchange medium pipeline. When the heat exchange medium in the heat exchange medium pipeline enters the liquid cooling plate through the medium inlet, it first exchanges heat with the battery, then with the converter, and then flows out of the liquid cooling plate from the medium outlet.

2. The energy storage unit as described in claim 1, characterized in that, The liquid cooling plate has a heat exchange plane, and the battery and the converter are arranged side by side on the heat exchange plane. Both the battery and the converter are connected to the heat exchange plane through thermally conductive silicone.

3. The energy storage unit as described in claim 2, characterized in that, The energy storage unit also includes a connector, through which both the battery and the converter are fixedly connected to the liquid cooling plate.

4. The energy storage unit as described in claim 2, characterized in that, The converter includes a base and a heating element. The heating element is disposed on the base, which is in contact with the heat exchange plane. The base is made of a high thermal conductivity material.

5. The energy storage unit as described in claim 1, characterized in that, The liquid cooling plate includes a single medium flow path, which is arranged in a serpentine pattern. The two ends of the single medium flow path are respectively connected to the medium inlet and the medium outlet; or The liquid cooling plate includes multiple straight medium flow paths, which are parallel to each other, and both ends of the multiple straight medium flow paths are simultaneously connected to the medium inlet and the medium outlet.

6. The energy storage unit as described in claim 1, characterized in that, The energy storage unit also includes a housing shell, the liquid cooling plate is fixed to the bottom of the housing shell, and the battery and the converter are arranged side by side on the liquid cooling plate with a gap between them and the housing shell.

7. An energy storage device, characterized in that, The energy storage device includes two or more energy storage units as described in any one of claims 1-6, the two or more energy storage units are stacked, and each energy storage unit is electrically connected to the other.

8. The energy storage device as described in claim 7, characterized in that, The energy storage device includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the medium inlet of the liquid cooling plate of two or more energy storage units, and the outlet pipe is connected to the medium outlet of the liquid cooling plate of two or more energy storage units.

9. The energy storage device as described in claim 8, characterized in that, The liquid inlet pipe includes a main liquid inlet pipe and multiple branch liquid inlet pipes. The multiple branch liquid inlet pipes are connected to the main liquid inlet pipe at intervals. Each branch liquid inlet pipe is corresponding to a liquid cooling plate of a plurality of energy storage units. Each branch liquid inlet pipe is connected to the medium inlet of the corresponding liquid cooling plate. The liquid outlet pipe includes a main liquid outlet pipe and multiple branch liquid outlet pipes. The multiple branch liquid outlet pipes are connected to the main liquid outlet pipe at intervals. Each branch liquid outlet pipe is corresponding to a liquid cooling plate of a plurality of energy storage units. Each branch liquid outlet pipe is connected to the medium outlet of the corresponding liquid cooling plate.

10. A temperature control system for an energy storage battery, characterized in that, include: Air conditioning heat pump unit; The terminal indoor unit is connected to the air conditioning heat pump main unit through a heat exchange medium pipeline; as well as The energy storage device as described in any one of claims 7 to 9, wherein the liquid cooling plate of the energy storage device is connected to the heat exchange medium pipeline and is connected to the air conditioning heat pump host through the heat exchange medium pipeline; The air conditioning heat pump unit is used to deliver a heat exchange medium to the terminal indoor unit and the liquid cooling plate to achieve cooling when operating in cooling mode. The air conditioning heat pump unit is also used to deliver a heat exchange medium to the terminal indoor unit and the liquid cooling plate to achieve heating when operating in heating mode.

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