Energy storage device, energy storage system and charging network

Abstract

The utility model discloses an energy storage device, an energy storage system and a charging network, and relates to the technical field of batteries, the energy storage device comprises a battery device and a heat exchange device, the heat exchange device comprises a butt joint pipeline, the end part of the butt joint pipeline is provided with a butt joint, and the butt joint comprises a joint main body and a pressure bearing part; the connector body is provided with a pressure bearing area, and the pressure bearing area is configured to be connected with a clamping connecting piece in a clamping mode so as to be in butt joint with a matched connector and communicate with the matched connector. The pressure-bearing part is arranged in the pressure-bearing area of the joint main body and is positioned on the outer side of the inner side surface of the joint main body; the compressive strength of the pressure-bearing part is larger than that of the connector body. According to the technical scheme, the pressure-bearing part is arranged in the pressure-bearing area of the connector body, and the compressive strength of the pressure-bearing part is larger than that of the connector body, so that the pressure-bearing area is endowed with higher compressive strength, the risk of cracking of the butt joint is remarkably reduced, and the condition of liquid leakage caused by cracking is also remarkably improved.

Description

Technical Field

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

[0002] Currently, the market size of energy storage devices is closely related to the new energy power generation market. With the rapid development of the new energy market, the market for energy storage devices is also growing rapidly. Existing energy storage devices usually include heat exchange devices and battery devices. The heat exchange device is used to exchange heat with the battery device so that the battery device can operate in the high-efficiency temperature range. At present, liquid leakage is prone to occur at the docking parts of the pipeline components in the heat exchange device, which reduces the reliability of the energy storage device. Utility Model Content

[0003] The main purpose of this application is to propose an energy storage device, energy storage system and charging network, which aims to improve the situation in the heat exchange device of current energy storage devices where liquid leakage is prone to occur at the joints of pipeline components.

[0004] Firstly, the energy storage device proposed in this application includes a battery device and a heat exchange device, wherein the heat exchange device is configured to exchange heat with the battery device, and the heat exchange device includes a connecting pipeline, the end of which is provided with a docking joint, the docking joint comprising:

[0005] The connector body has a pressure-bearing area configured for a retaining connector to engage and communicate with a mating connector; and,

[0006] The pressure-bearing part is disposed in the pressure-bearing area of ​​the joint body and is located on the outer side of the inner side of the joint body;

[0007] The compressive strength of the pressure-bearing part is greater than that of the joint body.

[0008] The technical solution provided in this application provides that the pressure-bearing area of ​​the joint body is used for the clamping connection of the clamping connector. Under the connection action of the clamping connector, the joint body can be connected with the mating joint. Based on this, a pressure-bearing part is provided in the pressure-bearing area of ​​the joint body. Since the compressive strength of the pressure-bearing part is greater than the compressive strength of the joint body, the pressure-bearing area is given stronger compressive strength. The risk of cracking of the mating joint due to being clamped by the clamping connector is significantly reduced, and the situation of liquid leakage caused by cracking is also significantly improved.

[0009] In some embodiments, the connector body is made of plastic; and / or,

[0010] The pressure-bearing part is made of metal.

[0011] In the above technical solution, choosing plastic as the material for the connector body can significantly reduce the weight and production cost of the connector body; choosing metal as the material for the pressure-bearing part is beneficial because metal has higher mechanical strength and can withstand a much greater clamping force than plastic of the same size, thus improving the pressure resistance and reliability of the connector body.

[0012] In some embodiments, the pressure-bearing portion is arranged in a ring shape and sleeved around the periphery of the connector body.

[0013] In the above technical solution, since the pressure-bearing part is arranged in a ring shape, when the pressure-bearing area is subjected to the clamping force from the clamping connector, the clamping force will be evenly distributed on the entire circumference of the pressure-bearing part, which can obtain a large compressive strength with less material; moreover, the pressure-bearing part is sleeved on the periphery of the joint body and directly bears the clamping force, which greatly reduces the pressure on the joint body and plays a protective role for the joint body.

[0014] In some embodiments, the pressure-bearing part is integrally connected to the joint body.

[0015] In the above technical solution, the pressure-bearing part is set on the periphery of the joint body in an integral connection manner. This not only improves the overall structural strength of the butt joint, but also effectively reduces the probability of the joint body separating from the pressure-bearing part due to the greater shrinkage of the pressure-bearing part in low-temperature environments, thus ensuring the firmness of the butt joint and the mating joint.

[0016] In some embodiments, a fitting annular groove is provided around the periphery of the connector body, and the pressure-bearing part is embedded in the fitting annular groove; and / or,

[0017] The connector body has a mating end, and the end of the pressure-bearing part away from the mating end is embedded into the interior of the connector body.

[0018] In the above technical solution, a fitting annular groove is provided on the periphery of the joint body, and the pressure-bearing part is embedded in the fitting annular groove. This helps to increase the connection area between the pressure-bearing part and the joint body through the fitting annular groove, thereby further improving the connection strength between the pressure-bearing part and the joint body. The end of the pressure-bearing part away from the mating end of the joint is embedded into the interior of the joint body. This end can help lock the joint body and the pressure-bearing part, preventing obvious interface separation between the joint body and the pressure-bearing part in the direction perpendicular to the mating direction, which helps to maintain the integral connection state between the joint body and the pressure-bearing part.

[0019] In some embodiments, a snap-fit ​​groove is provided on the outer side of the pressure-bearing portion, and the snap-fit ​​groove is configured to allow the snap-fit ​​portion of the snap-fit ​​connector to snap into place.

[0020] In the above technical solution, by setting a snap-fit ​​groove on the outside of the pressure-bearing part, the snap-fit ​​groove can provide a stable snap-fit ​​point for the snap-fit ​​part of the snap-fit ​​connector, which can effectively reduce the probability that the snap-fit ​​part will detach from the pressure-bearing part during the snap-fit ​​connection of the butt joint and mating joint.

[0021] In some embodiments, the snap-fit ​​groove is provided around the pressure-bearing portion.

[0022] In the above technical solution, the snap-fit ​​groove is arranged around the pressure-bearing part, which can provide continuously distributed snap-fit ​​points along the circumference of the connector body, providing a stable connection basis for the snap-fit ​​between the snap-fit ​​connector and the pressure-bearing part.

[0023] In some embodiments, two connecting pipes are provided, and the connecting joints of the two connecting pipes are connected to each other, and one of the connecting joints is configured as the mating joint;

[0024] The heat exchange device further includes a clamping connector, which is configured as a clamping ring. The clamping ring is sleeved on the two joint bodies. Both ends of the clamping ring are respectively provided with clamping parts protruding inward, and the two clamping parts are respectively clamped into the corresponding clamping grooves.

[0025] In the above technical solution, the two butt joints are mirror-mounted and each has a pressure-bearing part. The two snap-fit ​​parts at both ends of the clamping ring can be pressed into the corresponding snap-fit ​​grooves. As the clamping ring is tightened, the two snap-fit ​​parts can abut against the side wall of the corresponding snap-fit ​​groove and provide sufficient snap-fit ​​force along the butt joint direction.

[0026] In some embodiments, the heat exchange device further includes a mating pipeline, the end of which is provided with a mating joint, the mating joint being connected to and communicating with the joint body;

[0027] The heat exchange device further includes a retaining connector, which includes a connecting sleeve and a retaining part. One end of the connecting sleeve is integrally connected to the mating joint, and the retaining part is disposed at the other end of the connecting sleeve, and the retaining part is engaged with the retaining groove of the pressure bearing part.

[0028] In the above technical solution, the connecting sleeve is directly and integrally set on the mating joint. During the process of the mating joint extending into the connecting sleeve and mating with the mating joint, the snap-fit ​​part of the holding connector can directly snap into the snap-fit ​​groove of the pressure bearing part, which reduces the difficulty of the mating operation between the mating joint and the mating joint.

[0029] In some embodiments, the wall thickness of the mating joint is D1, and the wall thickness of the pressure-bearing portion is D2;

[0030] Where 0.2≤D2 / D1≤0.4.

[0031] Finite element analysis can determine the minimum wall thickness of the pressure-bearing part required to meet the compressive strength of the butt joint. After summarization, the ratio of the wall thickness of the pressure-bearing part to the wall thickness of the butt joint in the above technical solution is limited to 0.2 to 0.4, which can take into account both the compressive strength of the butt joint and the production cost, and can improve the problem of increased production cost caused by the redundancy of the wall thickness design of the pressure-bearing part.

[0032] Secondly, this application also proposes an energy storage system, which includes an energy storage device and an energy storage converter, wherein the energy storage converter is used to electrically connect the energy storage device and the power generation device.

[0033] Thirdly, this application also proposes a charging network that includes charging piles and an energy storage device or energy storage system, wherein the energy storage device is used to provide electrical energy to the charging piles. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 based on the structures shown in these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the charging network structure in some embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the energy storage system in some embodiments of this application;

[0037] Figure 3 This is a schematic diagram of the structure of the energy storage device in some embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the structure of the battery device in some embodiments of this application;

[0039] Figure 5 This is a partial structural diagram of the heat exchange device in some embodiments of this application;

[0040] Figure 6 for Figure 5 A schematic diagram of the structure of the first embodiment of the joint assembly;

[0041] Figure 7 for Figure 6 Schematic diagram of the structure of section AA;

[0042] Figure 8 for Figure 7 A magnified structural diagram of part B in the middle;

[0043] Figure 9 for Figure 5 A schematic diagram of the structure of the second embodiment of the connector assembly;

[0044] Figure 10 for Figure 9 Schematic diagram of the structure of the mid-section CC;

[0045] Figure 11 for Figure 10 A magnified schematic diagram of the local structure of D.

[0046] Explanation of icon numbers:

[0047] 1000, Charging network; 2000, Energy storage system; 3000, Power generation device;

[0048] 100. Energy storage device; 200. Charging pile; 300. Energy storage converter;

[0049] 1. Heat exchanger; 11. Connecting pipeline; 11a. Butt joint; 111. Joint body; 111a. Pressure-bearing area; 111b. Fitting annular groove; 112. Pressure-bearing part; 112a. Snap-fit ​​groove; 112b. Fitting end; 12. Matching pipeline; 12a. Matching joint; 13. Snap-fit ​​connector; 13a. Hoop ring; 13b. Connecting sleeve; 131. Snap-fit ​​part;

[0050] 2. Battery assembly; 21. Housing; 211. Housing cover; 212. Housing body; 22. Battery cell; 3. Energy storage housing.

[0051] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0055] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0059] Please refer to Figure 1 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a charging network 1000 provided in some embodiments of this application. Figure 3This is a schematic diagram of the structure of an energy storage device 100 provided in some embodiments of this application. Embodiments of this application provide a charging network 1000, which includes a charging pile 200 for charging the charging network. The charging network 1000 may also include an energy storage device 100, which is electrically connected to the charging pile 200 and provides electrical energy to the charging pile 200.

[0060] It should be noted that the charging pile 200 and the battery cells in the energy storage device 100 are electrically connected via cables, and the battery cells can supply the charging pile 200 with their stored electrical energy. The charging pile 200 has a connector that can connect to a charging network, thereby replenishing the charging network with energy. The application of the energy storage device 100 in the charging network 1000 can effectively improve the safety of the charging network 1000 and also help to improve the flexibility of the charging network 1000 during deployment.

[0061] In a charging network 1000, there can be one charging pile 200, and the energy storage device 100 provides power to the one charging pile 200; there can also be multiple charging piles 200, and the energy storage device 100 provides power to multiple charging piles 200.

[0062] As an example, such as Figure 1 As shown, the charging network 1000 includes an energy storage device 100 and two charging piles 200, with the energy storage device 100 providing power to the two charging piles 200.

[0063] The energy storage device 100 may include a battery device 2, which is electrically connected to the charging pile 200 so that the battery device 2 can provide power to the charging pile 200.

[0064] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of this application. Embodiments of this application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 300, which can be electrically connected to a generator 3000 to convert the electrical power provided by the generator 3000. The energy storage system 2000 may also include an energy storage device 100, which is electrically connected to the energy storage converter 300. The energy storage converter 300 is used to connect between the generator 3000 and the energy storage device 100, and converts the electrical energy provided by the generator 3000 into power before storing it in the energy storage device 100.

[0065] The power generation device 3000 generates electrical energy and stores it in the energy storage device 100 via the energy storage converter 300. The application of the energy storage device 100 in the energy storage system 2000 effectively improves its operational reliability. In specific implementations, the power generation device 3000 can be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of the power generation device 3000.

[0066] As an example, such as Figure 2 As shown, the energy storage system 2000 includes an energy storage device 100 and an energy storage converter 300. The two power generation devices 3000 respectively transmit the generated electrical energy to the energy storage converter 300, and the energy storage converter 300 introduces the electrical energy into the energy storage device 100 for storage.

[0067] Please refer to Figure 3 The energy storage device 100 includes an energy storage box 3, and a battery device 2 is installed inside the energy storage box 3.

[0068] As an example, the energy storage device 100 can be an energy storage container, an energy storage cabinet, etc.

[0069] As examples, energy storage device 100 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to relevant users or charging networks during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electrical energy, and store it in energy storage device 100. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 100, and supply it to users as needed. Mobile power systems can supply power to charging networks in areas inaccessible by the mains grid, such as remote mountainous areas and isolated wilderness areas. Temporary power supply systems can provide power to users when there is insufficient electricity.

[0070] For a better understanding of the battery device in the energy storage device provided in this application, please refer to [link / reference]. Figure 4 , Figure 4This is an exploded structural diagram of an embodiment of the battery device provided in this application. The battery device 2 typically includes a housing 21 and battery cells 22. A mounting cavity is formed within the housing 21, through which the battery cells 22 are loaded. The basic structure of the housing 21 generally includes a housing body 212 and a housing cover 211. The housing cover 211 is disposed on the housing body 212 and, together with the housing body 212, defines the mounting cavity. Generally, the battery cells 22 are disposed on the housing body 212, and the mounting cavity can be mainly formed in the housing body 212. In this case, the housing body 212 can be understood as a basin-shaped structure, and the housing cover 211 is disposed on the housing body 212 to cover the mounting cavity. Alternatively, the mounting cavity can be mainly formed in the housing cover 211. In this case, the housing cover 211 can be understood as a cover-shaped structure, and the housing cover 211 is disposed on the housing body 212 to cover the battery cells 22 mounted on the housing body 212. Of course, the structure of the housing 21 is not limited to these.

[0071] The number of battery cells 22 in the housing 21 can be one or more. When multiple battery cells 22 are used, they can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 22 are connected in both series and parallel. Multiple battery cells 22 can be directly connected in series, parallel, or a combination thereof to form a battery assembly. Alternatively, multiple battery cells 22 can first be connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form a battery assembly. The battery device 2 may also include other structures, such as a busbar, for realizing the electrical connection between multiple battery cells 22 or multiple battery modules. Each battery cell 22 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 22 can be cylindrical, flat, cuboid, or other shapes.

[0072] Currently, the market size of energy storage devices is closely related to the new energy power generation market. With the rapid development of the new energy market, the market for energy storage devices is also growing rapidly. Existing energy storage devices typically include heat exchange devices and battery devices. The heat exchange device is used to exchange heat with the battery device so that the battery device can operate in the high-efficiency temperature range. The heat exchange device generally includes pipeline components and connector components. The connector components are used to connect the two connected pipelines in the pipeline components. The performance of the connector components is directly related to the sealing performance, pressure resistance, and production cost of the heat exchange device.

[0073] The mainstream joint solutions in heat exchangers can be divided into metal joints and injection-molded joints. While metal joints (such as stainless steel and copper alloys) have excellent mechanical properties and corrosion resistance, they are expensive and difficult to control production costs. In contrast, injection-molded joints have the advantages of low cost and easy production, but they also have problems such as insufficient strength and limited compressive strength. When dealing with high pressure or strong clamping forces, injection-molded joints are prone to cracking due to insufficient material strength. Especially in dynamic loads or long-term use scenarios, the structural integrity of injection-molded joints is difficult to guarantee, and liquid leakage in pipelines due to cracking occurs frequently.

[0074] How to give injection molded joints sufficient compressive strength has become a problem that needs to be solved by those skilled in the art. Among the relevant improvement solutions, some use injection molding materials with higher structural strength to process injection molded joints. However, the structural strength of injection molding materials is usually positively correlated with their cost. In the end, it is easy to find that when the compressive strength of injection molded joints meets the requirements, their cost is almost close to or even exceeds that of metal joints. Therefore, improving the injection molding material alone cannot meet the requirements.

[0075] In view of this, this application provides an energy storage device. The heat exchange device of the energy storage device includes a joint assembly. One of the mating joints of the joint assembly includes a joint body and a pressure-bearing part. The mating joint is engaged with the matching part through its pressure-bearing part. By using a pressure-bearing part with higher compressive strength in the critical part, the compressive strength of the mating joint can be significantly improved. The probability of liquid leakage in the pipeline due to cracking of the mating joint is reduced, thereby improving the situation where liquid leakage is prone to occur at the mating part of the pipeline assembly in the current heat exchange device of the energy storage device.

[0076] To facilitate understanding of the energy storage device provided in this application, the following description is provided in conjunction with the accompanying drawings, wherein... Figure 5 This is a partial structural diagram of the heat exchange device in some embodiments of this application; Figure 6 for Figure 5 A schematic diagram of the structure of the first embodiment of the joint assembly; Figure 7 for Figure 6 Schematic diagram of the structure of section AA; Figure 8 for Figure 7 A magnified structural diagram of part B in the middle; Figure 9 for Figure 5 A schematic diagram of the structure of the second embodiment of the connector assembly; Figure 10 for Figure 9 Schematic diagram of the structure of the mid-section CC; Figure 11 for Figure 10 A magnified schematic diagram of the local structure of D.

[0077] Please see Figures 5 to 7In some embodiments, the energy storage device 100 proposed in this application includes a battery device and a heat exchange device 1. The heat exchange device 1 is configured to exchange heat with the battery device. The heat exchange device 1 includes a connecting pipe 11, and the end of the connecting pipe 11 is provided with a mating joint 11a. The mating joint 11a includes a joint body 111 and a pressure-bearing part 112. The joint body 111 has a pressure-bearing area 111a, which is configured for a clamping connector 13 to clamp and connect with a mating joint 12a. The pressure-bearing part 112 is disposed in the pressure-bearing area 111a of the joint body 111 and is located outside the inner side of the joint body 111. The compressive strength of the pressure-bearing part 112 is greater than the compressive strength of the joint body 111.

[0078] The "butt joint 11a" typically has a connecting end and a mating end. The connecting end is connected to the corresponding mating pipeline 11, and the mating end is used to mate with the mating joint 12a. Therefore, the butt joint 11a and the mating joint 12a have a mating direction. For most rotating body-shaped butt joints 11a, the mating direction also refers to its axial direction. In this embodiment, the structural form of the mating joint 12a is not required. For the energy storage device 100, the mating joint 12a can be an internal structure of its heat exchange device 1 or an external structure of the energy storage device 100. For example, the mating joint 12a can be a connector of the external flow path of the energy storage device 100. After the mating is completed, the butt joint 11a and the mating joint 12a usually exist in pairs.

[0079] Similarly, the "clamping connector 13" can be an internal structure of the heat exchange device 1 or an external structure of the energy storage device 100. The clamping connector 13 typically has two opposing ends in the mating direction of the mating joint 11a and the mating joint 12a, one end of which is used for clamping connection with the pressure-bearing area 111a of the mating joint 11a. This embodiment does not limit the specific structural form of the pressure-bearing area 111a of the joint body 111, so the clamping connection method of the clamping connector 13 is not limited. However, the clamping connector 13 can act on at least two mating joints. The head 11a and the mating joint 12a are provided with a retaining force along their mating direction. In a specific retaining connection method, the pressure-bearing area 111a is provided with a retaining recess facing the mating direction. One end of the retaining connector 13 corresponding to the retaining recess is provided as a retaining protrusion. The retaining protrusion is embedded into the retaining recess by deformation and then returns to its shape, thereby maintaining the retaining connection with the retaining recess. In other retaining connection methods, the retaining connector 13 may also apply a retaining force perpendicular to the mating direction to the pressure-bearing area 111a.

[0080] The "butt joint 11a" includes a joint body 111 and a pressure-bearing part 112. The joint body 111 refers to the main body of the butt joint 11a. Therefore, the joint body 111 also has the aforementioned connecting end and mating end, as well as a joint channel connecting the connecting end and the mating end. "The compressive strength of the pressure-bearing part 112 is greater than the compressive strength of the joint body 111" means that, under the premise that the materials of the pressure-bearing part 112 and the joint body 111 have the same size and shape, the former can withstand a greater pressure load and maintain structural integrity than the latter. Based on this, there are various material options for the joint body 111, such as polypropylene, polyamide, etc. There are also various material options for the pressure-bearing part 112, such as stainless steel, aluminum alloy, copper, ceramic, etc. In this embodiment, the materials of the pressure-bearing part 112 and the joint body 111 are not limited.

[0081] The phrase "the pressure-bearing part 112 is disposed in the pressure-bearing area 111a of the joint body 111" includes two options: "the pressure-bearing part 112 is partially disposed in the pressure-bearing area 111a" and "the pressure-bearing part 112 is disposed entirely in the pressure-bearing area 111a". Obviously, the latter option is more effective in improving the compressive strength of the pressure-bearing area 111a, but the former option at least contributes to improving the compressive strength of the pressure-bearing area 111a. The phrase "the pressure-bearing part 112 is located on the outer side of the inner side of the joint body 111" also includes two options: "the pressure-bearing part 112 is disposed on the outer side of the pipe wall of the joint body 111" and "the pressure-bearing part 112 is disposed on the inner side of the pipe wall of the joint body 111". In the embodiments of this application, the pressure-bearing part 112 does not participate in forming the joint channel of the butt joint 11a.

[0082] The technical solution provided in this application provides that the pressure-bearing area 111a of the connector body 111 is used for the clamping connector 13 to clamp and connect. Under the connection action of the clamping connector 13, the connector body 111 can dock and communicate with the mating connector 12a. Based on this, a pressure-bearing part 112 is provided in the pressure-bearing area 111a of the connector body 111. Since the compressive strength of the pressure-bearing part 112 is greater than that of the connector body 111, the pressure-bearing area 111a is given stronger compressive strength. The risk of cracking of the mating connector 11a due to being clamped by the clamping connector 13 is significantly reduced, and the situation of liquid leakage due to cracking is also significantly improved.

[0083] Furthermore, the partial use of the pressure-bearing part 112 helps control the production cost of the butt joint 11a. At the same time, since the pressure-bearing part 112 is located on the outer side of the inner side of the joint body 111, the connection interface between the pressure-bearing part 112 and the joint body 111 is not exposed in the joint channel of the butt joint 11a. This effectively reduces the probability of liquid in the joint channel leaking outward from the connection interface between the pressure-bearing part 112 and the joint body 111 during the thermal expansion and contraction of the butt joint 11a.

[0084] In some embodiments, the connector body 111 is made of plastic.

[0085] In the above technical solution, choosing plastic material for the connector body 111 can significantly reduce the weight and production cost of the connector body 111.

[0086] In some other embodiments, the pressure-bearing part 112 is made of metal.

[0087] In the above technical solution, the material of the pressure-bearing part 112 is selected as metal. Since metal has higher mechanical strength, it can withstand a much greater clamping force than plastic material of the same size, thereby improving the pressure resistance reliability of the connector body 111.

[0088] It should be noted that the two parallel technical features mentioned above, "the material of the connector body 111 is plastic" and "the material of the pressure-bearing part 112 is metal", can be set either one or both.

[0089] In some embodiments, the pressure-bearing portion 112 is arranged in a ring shape and is sleeved around the periphery of the connector body 111.

[0090] In the above technical solution, since the pressure-bearing part 112 is arranged in a ring shape, when the pressure-bearing area 111a is subjected to the clamping force from the clamping connector 13, the clamping force will be evenly distributed on the entire circumference of the pressure-bearing part 112, which can obtain a large compressive strength with less material; moreover, the pressure-bearing part 112 is sleeved on the periphery of the connector body 111 and directly bears the clamping force, which greatly reduces the pressure on the connector body 111 and plays a protective role for the connector body 111.

[0091] In some embodiments, the pressure-bearing part 112 is integrally connected to the connector body 111.

[0092] Considering that the pressure-bearing part 112 and the joint body 111 have different compressive strengths, the materials of the pressure-bearing part 112 and the joint body 111 are usually different as well. Taking the materials of the pressure-bearing part 112 and the joint body 111 as metal and plastic respectively, the way to integrally connect the pressure-bearing part 112 to the joint body 111 includes structural adhesive bonding and injection molding. This embodiment does not limit this.

[0093] In the above technical solution, the pressure-bearing part 112 is set on the periphery of the joint body 111 by integral connection. This not only improves the overall structural strength of the butt joint 11a, but also effectively reduces the probability that the joint body 111 will separate from the pressure-bearing part 112 due to the greater shrinkage in low temperature environment, thus ensuring the firmness of the butt joint 11a and the mating joint 12a.

[0094] In the above embodiment, the pressure-bearing part 112 is integrally connected to the connector body 111. The pressure-bearing part 112 can be directly provided on the flat peripheral wall of the connector body 111. In this case, the pressure-bearing part 112 is integrally connected to the peripheral wall of the connector body 111 only through its inner wall. To fully utilize the two end walls of the pressure-bearing part 112, please refer to... Figure 8 and Figure 11 In some embodiments, the outer periphery of the connector body 111 is provided with a fitting annular groove 111b, and the pressure-bearing part 112 is embedded in the fitting annular groove 111b.

[0095] "The pressure-bearing part 112 is embedded in the fitting ring groove 111b" means that the inner side wall of the pressure-bearing part 112 is integrally connected to the bottom wall of the fitting ring groove 111b, and the two end walls of the pressure-bearing part 112 in the above-mentioned docking direction are integrally connected to the two side walls of the fitting ring groove 111b respectively.

[0096] Compared to the solution of directly setting the pressure-bearing part 112 on the periphery of the flat joint body 111, the above technical solution provides an interlocking annular groove 111b on the periphery of the joint body 111 and embeds the pressure-bearing part 112 into the interlocking annular groove 111b. This is beneficial to increase the connection area between the pressure-bearing part 112 and the joint body 111 through the interlocking annular groove 111b. At the same time, the groove sidewall of the interlocking annular groove 111b can provide a stopping effect on the pressure-bearing part 112 in the above-mentioned docking direction. That is, the clamping force applied by the clamping connector 13 to the pressure-bearing part 112 can be distributed by the inner sidewall and end wall of the pressure-bearing part 112, further improving the connection strength between the pressure-bearing part 112 and the joint body 111.

[0097] Please see Figure 8 and Figure 10 In other embodiments, the connector body 111 has a mating end, and the end of the pressure-bearing portion 112 away from the mating end is embedded in the interior of the connector body 111.

[0098] "The end of the pressure-bearing part 112 that is away from the mating end" refers to the fact that, in the aforementioned mating direction, the pressure-bearing part 112 has two ends, which are close to and away from the mating joint 12a, respectively. For ease of understanding, the end of the two ends that is away from the mating joint 12a is defined as the fitting end 112b. The fitting end 112b being embedded in the interior of the joint body 111 should be understood as the fitting end 112b extending along the mating direction and being embedded in the interior of the joint body 111.

[0099] In low-temperature or high-temperature environments, the joint body 111 and the pressure-bearing part 112 will undergo thermal expansion and contraction not only in the docking direction but also in the direction perpendicular to the docking direction. At the same time, due to the difference in materials, the joint body 111 and the pressure-bearing part 112 have significantly different degrees of thermal expansion and contraction. In the above technical solution, one end of the pressure-bearing part 112 away from the docking end of the docking joint 11a is embedded into the interior of the joint body 111. When the joint body 111 and the pressure-bearing part 112 undergo thermal expansion and contraction, this end can help lock the joint body 111 and the pressure-bearing part 112, preventing obvious interface separation between the joint body 111 and the pressure-bearing part 112 in the direction perpendicular to the docking direction, which is conducive to maintaining the integral connection state of the joint body 111 and the pressure-bearing part 112.

[0100] It should be noted that the two parallel technical features mentioned above, "the pressure-bearing part 112 is embedded in the fitting annular groove 111b" and "the end of the pressure-bearing part 112 away from the mating end is embedded into the interior of the connector body 111", can be set either one or both. Obviously, setting both at the same time can bring more beneficial effects.

[0101] Please see Figure 8 and Figure 11 In some embodiments, a snap-fit ​​groove 112a is provided on the outer side of the pressure-bearing part 112, and the snap-fit ​​groove 112a is configured to snap-fit ​​the snap-fit ​​part 131 of the connector 13.

[0102] "Outer side of pressure-bearing part 112" refers to the side of pressure-bearing part 112 that is away from the connector channel of connector body 111; the number of "slots 112a" can be one or more, and multiple slots 112a can be distributed circumferentially along the pressure-bearing part 112. Correspondingly, multiple slots 131 of the holding connector 13 can also be provided, which are respectively engaged with multiple slots 112a.

[0103] In the above technical solution, by providing a snap-fit ​​groove 112a on the outside of the pressure-bearing part 112, the snap-fit ​​groove 112a can provide a stable snap-fit ​​point for the snap-fit ​​part 131 of the snap-fit ​​connector 13, which can effectively reduce the probability that the snap-fit ​​part 131 will detach from the pressure-bearing part 112 during the snap-fit ​​connection of the snap-fit ​​connector 13 to the mating joint 11a and the mating joint 12a.

[0104] In some embodiments, the snap-fit ​​groove 112a is provided around the pressure-bearing portion 112.

[0105] The snap-fit ​​groove 112a is arranged around the pressure-bearing part 112. Correspondingly, the snap-fit ​​part 131 of the snap-fit ​​connector 13 can also be arranged in a ring. Of course, multiple snap-fit ​​parts 131 can also be arranged at intervals to share the snap-fit ​​groove 112a.

[0106] In the above technical solution, the snap-fit ​​groove 112a is arranged around the pressure-bearing part 112, which can provide continuously distributed snap-fit ​​points along the circumference of the connector body 111, providing a stable connection basis for the snap-fit ​​between the snap-fit ​​connector 13 and the pressure-bearing part 112.

[0107] Please see Figures 9 to 11 In some embodiments, two connecting pipes 11 are provided, and the butt joints 11a of the two connecting pipes 11 are connected to each other. One of the butt joints 11a is configured as a mating joint 12a. The heat exchange device 1 also includes a retaining connector 13, which is configured as a clamping ring 13a. The clamping ring 13a is sleeved on the two connector bodies 111. Both ends of the clamping ring 13a are respectively provided with a retaining part 131 protruding inward. The two retaining parts 131 are respectively engaged with the corresponding retaining grooves 112a.

[0108] The "hooking ring 13a" is typically a thin-walled metal structure. In its natural state before connection, it is elongated and has two locking ends along its length and two snap-fit ​​ends along its width. During connection, the elongated hooping ring 13a is arranged around the two mating joints 11a, allowing the two locking ends to approach each other end-to-end. By tightening bolts, the elongated hooping ring 13a is fixed into a ring structure. Furthermore, the snap-fit ​​parts 131 corresponding to the two snap-fit ​​ends apply a clamping force to the corresponding groove sidewalls of the snap-fit ​​grooves 112a on the two mating joints 11a. Figure 11 In the embodiment shown, the two groove sidewalls of the two snap-fit ​​grooves 112a that are close to each other are gradually arranged to move closer together in the direction away from the connector body 111, so that as the two locking ends move closer together, the force applied by the snap-fit ​​part 131 to the groove sidewall of the snap-fit ​​groove 112a continuously increases, so as to finally achieve the sealing requirement.

[0109] In the above technical solution, the two mating joints 11a are mirror-mounted and each has a pressure-bearing part 112. The two snap-fit ​​parts 131 at both ends of the clamping ring 13a can be pressed into the corresponding snap-fit ​​grooves 112a respectively. As the clamping ring 13a is locked, the two snap-fit ​​parts 131 can abut against the groove sidewall of the corresponding snap-fit ​​groove 112a and provide sufficient snap-fit ​​force along the mating direction.

[0110] Please see Figures 6 to 8In some embodiments, the heat exchange device 1 further includes a mating pipe 12, the end of which is provided with a mating connector 12a, which is connected to and communicates with the connector body 111; the heat exchange device 1 further includes a retaining connector 13, which includes a connecting sleeve 13b and a retaining part 131, one end of the connecting sleeve 13b is integrally connected to the mating connector 12a, and the retaining part 131 is provided at the other end of the connecting sleeve 13b, and the retaining part 131 is engaged with the retaining groove 112a of the pressure bearing part 112.

[0111] This application embodiment does not limit the structural type and material distribution of the mating joint 12a. The mating joint 12a can at least connect to the corresponding mating pipe 12 and connect with the mating joint 11a. "One end of the connecting sleeve 13b is integrally connected to the mating joint 12a" can be understood as the connecting sleeve 13b and the mating joint 12a being made of the same material and being directly processed from the same base material. Of course, the connecting sleeve 13b and the mating joint 12a can also be made of different materials and integrally connected by injection molding.

[0112] In the above technical solution, the connecting sleeve 13b is directly and integrally set on the mating joint 12a. When the mating joint 11a extends into the connecting sleeve 13b and mates with the mating joint 12a, the snap-fit ​​part 131 of the holding connector 13 can directly snap into the snap-fit ​​groove 112a of the pressure bearing part 112, which reduces the difficulty of the mating operation between the mating joint 11a and the mating joint 12a.

[0113] In such Figure 6 In the embodiment shown, the snap-fit ​​part 131 is an open metal ring. One end of the open metal ring is connected to the connecting sleeve 13b, and the other end is freely disposed, so that when the mating joint 11a extends into the connecting sleeve 13b and mates with the mating joint 12a, the open metal ring can first be expanded by force, and then spring back and snap into the snap-fit ​​groove 112a of the pressure bearing part 112. The connecting sleeve 13b is also provided with two sets of limiting structures, which are respectively disposed on both sides of the open metal ring along the mating direction to limit the deformation of the open metal ring along the mating direction.

[0114] Please see Figure 11 In some embodiments, the wall thickness of the mating joint 11a is D1, and the wall thickness of the pressure-bearing part 112 is D2; wherein, 0.2≤D2 / D1≤0.4.

[0115] The wall thickness D1 of the butt joint 11a and the wall thickness D2 of the pressure-bearing part 112 are both thicknesses at the same position in the butt joint direction perpendicular to the butt joint 11a. In some irregular structures of the pressure-bearing part 112 and the butt joint 11a, the wall thickness usually fluctuates at different positions in the butt joint direction. The above-mentioned proportional range takes this fluctuation into account.

[0116] It should be noted that in this embodiment, the ratio of the wall thickness of the pressure-bearing part 112 to the wall thickness of the butt joint 11a is limited to between 0.2 and 0.4. This means that the ratio can be arbitrarily selected between 0.2 and 0.4, such as 0.2, 0.3, 0.4, etc. This embodiment does not limit its specific value.

[0117] Finite element analysis can determine the minimum wall thickness of the pressure-bearing part 112 required to meet the compressive strength of the butt joint 11a. After summarization, the ratio of the wall thickness of the pressure-bearing part 112 to the wall thickness of the butt joint 11a in the above technical solution is limited to between 0.2 and 0.4. This balances the compressive strength of the butt joint 11a with the production cost and can improve the problem of increased production cost caused by the redundancy in the wall thickness design of the pressure-bearing part 112.

[0118] Specifically, the wall thickness of the butt joint 11a is D1, and the wall thickness of the pressure-bearing part 112 is D2; where D2 / D1=1 / 3, for example, D1=3mm, D2=1mm, which can also be understood as the wall thickness of the corresponding position of the joint body 111 being 2mm.

[0119] This application also proposes an energy storage system 2000, please refer to [link / reference needed]. Figure 2 The energy storage system 2000 includes an energy storage device 100 and an energy storage converter 300. The energy storage converter 300 is used to electrically connect the energy storage device 100 and the power generation device 3000. The specific structure of the energy storage device 100 is as described in the above embodiments. Since the energy storage system 2000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0120] This application also proposes a charging network 1000, please refer to [link / reference needed]. Figure 1 The charging network 1000 includes a charging pile 200 and an energy storage device 100 or an energy storage system 2000. The energy storage device 100 is used to provide electrical energy to the charging pile 200. The specific structure of the energy storage device 100 and the energy storage system 2000 is as described in the above embodiments. Since the charging network 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0121] This application discloses an energy storage device 100; please refer to [link / reference]. Figure 7The energy storage device 100 includes a battery device and a heat exchange device 1. The heat exchange device 1 is configured to exchange heat with the battery device. The heat exchange device 1 includes a connecting pipe 11, a mating pipe 12, a clamping connector 13, a mating joint 11a, and a mating joint 12a. The mating joint 11a and the mating joint 12a are respectively connected to the ends of the connecting pipe 11 and the mating pipe 12, and are connected and interlocked. The mating joint 11a includes a joint body 111 and a pressure-bearing part 112. The periphery of the joint body 111 is provided with an interlocking annular groove 111b. The pressure-bearing part 112 is sleeved around the periphery of the joint body 111 and embedded. The fitting annular groove 111b is provided, and the end of the pressure bearing part 112 away from the mating joint 12a is embedded into the interior of the joint body 111. The outer side of the pressure bearing part 112 is surrounded by a snap-fit ​​groove 112a. The snap-fit ​​connector 13 includes a connecting sleeve 13b and a snap-fit ​​part 131. One end of the connecting sleeve 13b is sleeved on the mating joint 11a, and the other end is integrally connected to the mating joint 12a. The snap-fit ​​part 131 is arranged in an annular shape corresponding to the snap-fit ​​groove 112a and is provided at one end of the connecting sleeve 13b corresponding to the mating joint 11a. The snap-fit ​​part 131 protrudes towards the inner side of the connecting sleeve 13b and snaps into the snap-fit ​​groove 112a.

[0122] This application also proposes an energy storage device 100, please refer to [reference needed]. Figure 10 The energy storage device 100 includes a battery device and a heat exchange device 1. The heat exchange device 1 is configured to exchange heat with the battery device. The heat exchange device 1 includes two connecting pipes 11, a clamping connector 13, and two mating joints 11a. The two mating joints 11a are mated and connected to each other and are respectively connected to the corresponding connecting pipes 11. The mating joint 11a includes a joint body 111 and a pressure-bearing part 112. The periphery of the joint body 111 is provided with an interlocking annular groove 111b. The pressure-bearing part 112 is annularly arranged and sleeved around the periphery of the joint body 111. The 112 is integrally embedded in the fitting annular groove 111b. The end of the pressure-bearing part 112 away from the other mating joint 11a is embedded into the interior of the joint body 111. The outer side of the pressure-bearing part 112 is surrounded by a snap-fit ​​groove 112a. The snap-fit ​​connector 13 includes a clamping ring 13a and two snap-fit ​​parts 131. The clamping ring 13a is sleeved on the two mating joints 11a. The two snap-fit ​​parts 131 are respectively arranged in annular shape and are located at both ends of the connecting sleeve 13b. The snap-fit ​​parts 131 protrude toward the inner side of the connecting sleeve 13b and snap into the corresponding snap-fit ​​groove 112a.

[0123] 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized by, The energy storage device includes a battery unit and a heat exchange unit. The heat exchange unit is configured to exchange heat with the battery unit. The heat exchange unit includes connecting pipes, and the ends of the connecting pipes are provided with docking joints. The docking joints include: The connector body has a pressure-bearing area configured for a retaining connector to engage and communicate with a mating connector; and, The pressure-bearing part is disposed in the pressure-bearing area of ​​the joint body and is located on the outer side of the inner side of the joint body; The compressive strength of the pressure-bearing part is greater than that of the joint body.

2. The energy storage device as described in claim 1, characterized in that, The connector body is made of plastic; and / or, The pressure-bearing part is made of metal.

3. The energy storage device of claim 1, wherein, The pressure-bearing part is arranged in a ring shape and is sleeved around the outer periphery of the joint body.

4. The energy storage device of claim 3, wherein, The pressure-bearing part is integrally connected to the joint body.

5. The energy storage device of claim 4, wherein, The outer periphery of the connector body is provided with a fitting annular groove, and the pressure-bearing part is embedded in the fitting annular groove; and / or, The connector body has a mating end, and the end of the pressure-bearing part away from the mating end is embedded into the interior of the connector body.

6. The energy storage device of any one of claims 3 to 5, wherein, The outer side of the pressure-bearing part is provided with a snap-fit ​​groove, which is configured to allow the snap-fit ​​part of the snap-fit ​​connector to snap into place.

7. The energy storage device of claim 6, wherein, The snap-fit ​​groove is arranged around the pressure-bearing part.

8. The energy storage device of claim 6, wherein, Two connecting pipes are provided, and the connecting joints of the two connecting pipes are connected to each other, and one of the connecting joints is set as the mating joint; The heat exchange device also includes a retaining connector, which is configured as a clamping ring. The clamping ring is sleeved on the two joint bodies. Both ends of the clamping ring are respectively provided with retaining parts protruding inward, and the two retaining parts are respectively engaged with the corresponding retaining grooves.

9. The energy storage device of claim 6, wherein, The heat exchange device also includes a mating pipeline, the end of which is provided with a mating joint, which is connected to and communicates with the joint body; The heat exchange device further includes a retaining connector, which includes a connecting sleeve and a retaining part. One end of the connecting sleeve is integrally connected to the mating joint, and the retaining part is disposed at the other end of the connecting sleeve, and the retaining part is engaged with the retaining groove of the pressure bearing part.

10. The energy storage device of any one of claims 1 to 5, wherein, The wall thickness of the butt joint is D1, and the wall thickness of the pressure-bearing part is D2; Where 0.2≤D2 / D1≤0.

4.

11. An energy storage system characterized by, Includes an energy storage device and an energy storage converter as described in any one of claims 1 to 10, wherein the energy storage converter is used to electrically connect the energy storage device and the power generation device.

12. A charging network characterized in that, It includes a charging pile and an energy storage device as described in any one of claims 1 to 10 or an energy storage system as described in claim 11, wherein the energy storage device is used to provide electrical energy to the charging pile.

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