Battery device, energy storage system and electric equipment

Abstract

The invention relates to a battery device, an energy storage system and electric equipment, and relates to the technical field of energy storage. The battery device may include a housing, a battery cell, an integrated busbar, a plug connector, and a battery management unit. The battery monomers and the integrated busbar can be arranged in the immersion cavity of the shell, immersion liquid can be contained in the immersion cavity, heat exchange can be performed between the immersion liquid and the battery monomers, and the integrated busbar can collect working signals of the battery monomers. The plug connector can extend out of the immersion cavity from the interior of the immersion cavity through the through hole of the shell. The integrated busbar located in the immersion cavity can be electrically connected with the battery management unit located outside the immersion cavity through the plug connector, so that working signals collected by the integrated busbar can be transmitted to the battery management unit through the plug connector. According to the content, the position of the battery management unit needing periodic maintenance is not in the immersion cavity, so that the device has the advantages of being convenient to disassemble, maintain and install, and the labor intensity of maintenance personnel is relatively low.

Description

Technical Field

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

[0002] In related technologies, battery devices include a housing, individual battery cells, an integrated busbar, and a battery management unit (BMU). The housing contains an immersion chamber, within which the individual battery cells, integrated busbar, and BMU are all housed. The immersion chamber also contains an immersion fluid, primarily used for heat exchange with the individual battery cells. The integrated busbar collects the operating status signals of the individual battery cells and transmits these signals to the BMU. However, the BMU requires periodic maintenance; its location within the immersion chamber presents a challenge in maintaining it. Summary of the Invention

[0003] This application provides a battery device, energy storage system, and electrical equipment, which has the advantage of facilitating the maintenance of the battery management unit.

[0004] Firstly, this application provides a battery device, which may include a housing, battery cells (also referred to as secondary batteries), and an integrated busbar (also referred to as a signal acquisition component). An immersion chamber may be provided within the housing, and both the battery cells and the integrated busbar may be disposed within the immersion chamber. The battery cells can obtain electrical energy from an external circuit and can also release electrical energy to an external circuit. The integrated busbar can acquire signals reflecting the operating status of the battery cells, such as temperature, current, and voltage signals, during charging and discharging. The immersion chamber may contain an immersion liquid, which can exchange heat with the battery cells to keep the battery cell temperature within the normal operating temperature range, thereby increasing the reliability and lifespan of the battery cells. The battery device of this application may further include a connector and a battery management unit. The housing may have a through hole, and the connector may extend from inside the immersion chamber through the through hole to outside the immersion chamber. The battery management unit is located outside the immersion chamber. The integrated busbar located inside the immersion chamber can be electrically connected to the battery management unit located outside the immersion chamber through a connector, so that the working signals collected by the integrated busbar can be transmitted to the battery management unit through the connector.

[0005] As described above, since the battery management unit, which requires periodic maintenance, is not located within the immersion chamber, this design offers advantages such as ease of disassembly, maintenance, and installation, resulting in relatively low workload for maintenance personnel. Furthermore, during battery management unit maintenance, personnel do not need to disassemble or reassemble the structures within the housing that enclose the immersion chamber. The sealing components of these structures remain unaffected, maintaining high sealing reliability and lifespan. The immersion fluid also avoids contact with dust, impurities, and other contaminants outside the immersion chamber, ensuring a relatively high level of cleanliness. Maintenance personnel's hands also do not need to come into contact with the immersion fluid, maintaining a high level of cleanliness at the maintenance site.

[0006] Optionally, the battery device may also include a sealing ring with a through hole, through which a connector passes. The connector includes an annular limiting portion, and the sealing ring is pressed against the housing by the annular limiting portion so that the connector is sealed to the housing through the sealing ring.

[0007] Optionally, a first annular negative pressure chamber is provided on the side of the sealing ring away from the annular limiting part. The first annular negative pressure chamber is negatively attracted to the housing to make the sealing reliability relatively high.

[0008] Optionally, a second annular negative pressure chamber is provided on the side of the sealing ring near the annular limiting part. The second annular negative pressure chamber is negatively attracted to the annular limiting part to make the sealing reliability relatively high.

[0009] Optionally, the battery device may include two sealing rings, one of which is a first sealing ring and the other is a second sealing ring. The inner diameter of the first sealing ring is larger than the outer diameter of the second sealing ring, and the first sealing ring surrounds the second sealing ring.

[0010] Optionally, a portion of the inner circular wall of the first sealing ring is connected to a portion of the outer circular wall of the second sealing ring via a connecting strip.

[0011] Optionally, both the sealing ring and the annular limiting part can be located within the immersion cavity.

[0012] Alternatively, both the sealing ring and the annular limiting part can be located outside the immersion cavity.

[0013] Optionally, the battery device also includes fasteners, the connector being fixedly connected to a portion of the structural wall of the housing by the fasteners, and the sealing ring being pressed against the portion of the structural wall of the housing by the annular limiting portion.

[0014] Optionally, the battery device also includes an external cover, which covers a portion of the outer wall of the housing, and the battery management unit is located inside the external cover.

[0015] Optionally, the battery device further includes a secondary housing, which has a receiving cavity and a secondary through hole. The battery management unit is located in the receiving cavity. The battery device also includes a secondary connector, which passes through the secondary through hole so that the secondary connector extends from inside the receiving cavity to outside the receiving cavity. The battery management unit is electrically connected to the connector through the secondary connector.

[0016] Optionally, the containment cavity is used to contain the immersion liquid.

[0017] Optionally, the housing includes a main housing and a separator, the separator being located inside the main housing, the inner cavity of the main housing being divided by the separator into an immersion chamber and a dry chamber, the battery management unit being located in the dry chamber, and the connector extending from the immersion chamber to the dry chamber.

[0018] Optionally, the main housing includes a mating part that protrudes into the inner cavity. The mating part is provided with a first through hole, and the partition is provided with a second through hole. The first through hole and the second through hole are aligned and both are penetrated by a connector. The mating part is fixedly connected to the partition through the connector.

[0019] Optionally, the mating part is provided with at least two first through holes, the separator is provided with at least two second through holes, and the battery device includes at least two plugs, with each first through hole and the corresponding second through hole being penetrated by the corresponding plug.

[0020] Optionally, the housing includes a first housing and a second housing. The first housing has an immersion chamber and a through window. The second housing passes through the window and is sealed to the first housing. The second housing has a through hole and a dry chamber. The connector extends from the immersion chamber through the through hole into the dry chamber, and the battery management unit is located in the dry chamber.

[0021] Optionally, the battery device further includes a sealing gasket with a through hole, through which a second housing is disposed, and the outer wall of the second housing includes an annular limiting structure, which presses the sealing gasket against the first housing.

[0022] Optionally, a first annular negative pressure cavity is provided on the side of the sealing gasket away from the annular limiting structure, and the first annular negative pressure cavity is negatively adsorbed onto the first housing.

[0023] Optionally, a second annular negative pressure chamber is provided on the side of the sealing gasket near the annular limiting structure, and the second annular negative pressure chamber is negatively adsorbed onto the annular limiting structure.

[0024] Optionally, the connector includes at least two first connectors located within the immersion chamber, and at least two second connectors located outside the immersion chamber.

[0025] Secondly, this application provides an energy storage system that includes the battery device described above. Accordingly, the energy storage system may also include the technical effects of the battery device described above, which will not be repeated here.

[0026] Thirdly, this application provides an electrical device that includes the energy storage system described above. The electrical device can be a tram, a power grid, a household appliance, etc. Accordingly, the electrical device may also include the technical effects of the battery device described above, which will not be repeated here.

[0027] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments 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 based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the battery device of this application in one embodiment;

[0030] Figure 2 This is a schematic diagram of the structure of a single battery cell in one embodiment;

[0031] Figure 3 This is a cross-sectional assembly diagram of the housing, connector, sealing ring, and nut in one embodiment;

[0032] Figure 4 This is a schematic diagram of the sealing ring in one embodiment;

[0033] Figure 5 This is a cross-sectional assembly diagram of the housing, connector, and sealing ring in one embodiment;

[0034] Figure 6 This is a cross-sectional view of the sealing ring in one embodiment;

[0035] Figure 7 This is a cross-sectional assembly diagram of the housing, connector, and sealing ring in another embodiment;

[0036] Figure 8 This is a cross-sectional assembly diagram of the housing and connector in yet another embodiment;

[0037] Figure 9 A cross-sectional assembly diagram of the housing, connector, and sealing ring in yet another embodiment;

[0038] Figure 10 This is a cross-sectional assembly structure diagram of the housing, connector, first sealing ring, and second sealing ring in one embodiment;

[0039] Figure 11 This is a partial cross-sectional view of the assembly structure of the housing, connector, first sealing ring, and second sealing ring in another embodiment;

[0040] Figure 12 This is a cross-sectional view of the first sealing ring, the second sealing ring, and the connecting strip in one embodiment;

[0041] Figure 13 This is a partial cross-sectional view of the assembly structure of the housing, connectors, outer cover, and battery management unit in one embodiment.

[0042] Figure 14 This is a partial cross-sectional view of the assembly structure of the housing, sub-housing, connector, and sub-connector in one embodiment;

[0043] Figure 15 A partial cross-sectional view of the assembly structure of the main housing, partition, connector and sealing ring in one embodiment;

[0044] Figure 16 A partial cross-sectional view of the assembly structure of the main housing and partition in one embodiment;

[0045] Figure 17 A cross-sectional view of the main housing in one embodiment;

[0046] Figure 18 This is a schematic diagram of the structure of the separator in one embodiment;

[0047] Figure 19 A partial cross-sectional view of the assembly structure of the main housing, partition, connector, sealing ring, first sealing gasket, and second sealing gasket in one embodiment;

[0048] Figure 20 This is a partial cross-sectional view of the assembly structure of the first housing, the second housing, the connector, the sealing ring, the nut, the sealing gasket, and the fastening nut in one embodiment.

[0049] Figure 21 This is a partial cross-sectional view of the assembly structure of the first housing, the second housing, and the sealing gasket in one embodiment;

[0050] Figure 22 This is a cross-sectional view of the first end of the connector in one embodiment.

[0051] Figure 23This is a cross-sectional view of the second end of the connector in one embodiment.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1-Shell, 1a-Second annular recessed structure, 11-Inner cavity, 111-Immersion cavity, 112-Dry cavity, 12-Through hole, 121-First through hole, 122-Second through hole, 13-Main shell, 131-Matching part, 14-Separator, 134a-First sealing gasket, 134b-Second sealing gasket, 15-First shell, 16-Second shell, 161-Main body, 161a-Annular limiting structure, 162-Cover, 2-Battery cell, 21-First sidewall, 22-Second sidewall, 23-Top wall, 24-Bottom wall, 25-Positive terminal, 26-Negative terminal, 27-Explosion-proof valve, 3-Integrated busbar, 31-Signal output terminal, 4-Connector, 41-First end, 411- 42-Second end, 421-Second connector, 43-Annular limiting part, 431-First annular recessed structure, 432-Sloping part, 4a-Secondary connector, 5-Battery management unit, 6-Sealing ring, 6a-First sealing ring, 6b-Second sealing ring, 6c-Gap space, 6d-Connecting strip, 61-Through hole, 62-First annular negative pressure chamber, 63-Second annular negative pressure chamber, 64-Third annular negative pressure chamber, 65-Annular recessed part, 66-Inner circular wall, 67-Outer circular wall, 7-Nut, 81-External cover, 811-Opening, 82-Secondary housing, 821-Receiving cavity, 9-Sealing gasket, 91-First side annular negative pressure chamber, 92-Second side annular negative pressure chamber, 9a-Fasting nut. Detailed Implementation

[0054] To better understand the technical solutions of this application, the embodiments of this application are described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application. The terminology used in the embodiments of this application is for the purpose of describing specific embodiments only, and is not intended to limit this application. The singular forms "a," "described," and "the" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should be understood that the term "and / or" used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0055] In the first aspect, this application provides some embodiments of battery devices, relating to the field of energy storage technology.

[0056] In the accompanying drawings of some embodiments, the front-back, left-right, and up-down directions (also referred to as the height direction) of the battery device are indicated, with each pair of these directions being perpendicular to each other. The front-back direction can also be a first direction, the left-right direction a second direction, and the up-down direction a third direction.

[0057] In some embodiments, please refer to Figure 1 As shown, the battery device may include a housing 1, battery cells 2, and an integrated busbar 3 (Cells Contact System, CCS). The housing 1 may have an immersion chamber 111, and both the battery cells 2 and the integrated busbar 3 may be disposed within the immersion chamber 111.

[0058] In some embodiments, the battery cell 2 may be a secondary battery (also known as a rechargeable battery or a storage battery), which refers to a battery that can be recharged after discharge to reactivate its active materials and thus restore electrical energy. The battery device includes at least two battery cells 2, and the electrical connection between the at least two battery cells 2 may be in series, parallel, or mixed connection, wherein mixed connection includes series and parallel connection.

[0059] In some embodiments, please refer to Figure 2 As shown, the battery cell 2 may include two first sidewalls 21 arranged back-to-back in the front-to-back direction, two second sidewalls 22 arranged back-to-back in the left-to-right direction, and a top wall 23 and a bottom wall 24 arranged back-to-up direction. The battery cell 2 may also include a positive terminal 25, a negative terminal 26, and an explosion-proof valve 27 disposed on the top wall 23. Both the positive terminal 25 and the negative terminal 26 can be electrically connected to an external circuit located outside the battery cell 2, allowing the battery cell 2 to release electrical energy to the external circuit, or to obtain electrical energy from the external circuit. The explosion-proof valve 27 is used to discharge high-pressure gas inside the battery cell 2, thereby reducing the likelihood of the battery cell 2 exploding.

[0060] In some embodiments, the integrated busbar 3 may include multiple tabs (not shown in the figure), which may be conductive metal sheets such as aluminum sheets or copper sheets. The positive terminal 25 of any one battery cell 2 can be electrically connected to the negative terminal 26 of another battery cell 2 through a tab, so that the two battery cells 2 are connected in series.

[0061] In some embodiments, the integrated busbar 3 may be referred to as a signal acquisition component. The integrated busbar 3 can acquire working signals that reflect the charging and discharging status of the battery cell 2, such as current signals, voltage signals, and temperature signals.

[0062] In some embodiments, the integrated busbar 3 may include multiple cables (not shown in the figure), each cable having a data acquisition unit at its end. The data acquisition unit can be located on the busbar panel and is used to acquire operating signals. Alternatively, the integrated busbar 3 may include a flexible printed circuit board (not shown in the figure), which may also have a data acquisition unit located on the busbar panel and is used to acquire operating signals. Still alternatively, the integrated busbar 3 may include a printed circuit board (not shown in the figure), which may also have a data acquisition unit located on the busbar panel and is used to acquire operating signals.

[0063] In some embodiments, please refer to Figure 1 As shown, the immersion chamber 111 can contain an immersion liquid (not shown in the figure). The immersion liquid can exchange heat with the battery cell 2 to keep the temperature of the battery cell 2 within its normal operating temperature range, thereby increasing the reliability and service life of the battery cell 2. The type of immersion liquid can include single-phase and two-phase immersion liquids. Single-phase immersion liquids can include mineral oil, silicone oil, fluorinated liquids, synthetic esters, or other types of immersion liquids that do not undergo phase change. Two-phase immersion liquids can include low-boiling-point fluorinated liquids or other types of immersion liquids that can undergo boiling phase change. Furthermore, the structure in the housing 1 used to enclose the immersion chamber 111 has reliable sealing properties to reduce the possibility of immersion liquid leakage or contamination.

[0064] In some embodiments, please refer to Figure 1 As shown, the housing 1 may be provided with a through hole. The battery device may also include a connector 4, which may pass through the through hole so that the connector 4 extends from inside the immersion chamber 111 to outside the immersion chamber 111. The battery device may also include a battery management unit (BMU), which is located outside the immersion chamber 111. The integrated busbar 3 may be electrically connected to the battery management unit 5 through the connector 4 so that the operating signals collected by the integrated busbar 3 may be transmitted to the battery management unit 5 through the connector 4.

[0065] Among them, such as Figure 3 The first end 41 of the connector 4 shown is located in the immersion cavity 111 and is connected to... Figure 1 The signal output terminal 31 of the integrated busbar 3 shown can be electrically connected, and the second terminal 42 of the connector 4 located outside the immersion chamber 111 can be electrically connected to the signal receiving terminal of the battery management unit 5.

[0066] As can be seen from the above, since the battery management unit 5, which requires periodic maintenance, is not located within the immersion chamber 111, this arrangement offers advantages such as ease of disassembly, maintenance, and installation, resulting in relatively low labor intensity for maintenance personnel. Furthermore, during the maintenance of the battery management unit 5, maintenance personnel do not need to disassemble or assemble the structure within the housing 1 used to enclose the immersion chamber 111. The sealing components of this structure remain unaffected, maintaining high sealing reliability and service life. The immersion fluid also avoids contact with dust, impurities, and other contaminants outside the immersion chamber 111, resulting in a relatively high level of cleanliness. Maintenance personnel's hands also do not need to come into contact with the immersion fluid, maintaining a high level of cleanliness at the maintenance site.

[0067] In some embodiments, please refer to Figures 3-4 As shown, the battery device may further include a sealing ring 6 with a through hole 61 through which the connector 4 can pass. The connector 4 may include an annular limiting portion 43, which can press the sealing ring 6 against the housing 1. In this configuration, the annular limiting portion 43 is in close contact with the sealing ring 6, and the sealing ring 6 is in close contact with the housing 1, thereby reducing the likelihood of immersion fluid leaking from the immersion cavity 111 through the assembly gap between the housing 1 and the connector 4 to the outside of the immersion cavity 111, and also reducing the likelihood of contaminants outside the immersion cavity 111 entering the immersion cavity 111 through the assembly gap between the housing 1 and the connector 4.

[0068] The material of the sealing ring 6 may include at least one of fluororubber, fluorosilicone rubber, nitrile rubber, and polytetrafluoroethylene.

[0069] In addition, the sealing ring 6 can have a certain degree of elasticity.

[0070] In some embodiments, the force exerted by the annular limiting portion 43 on the sealing ring 6 can come from a tightening force; please refer to... Figure 3 As shown, the battery device may also include a nut 7, which is located on the side of the housing 1 away from the sealing ring 6. The nut 7 is threadedly connected to the connector 4. When the nut 7 is rotated, the nut 7 can drive the annular limiting part 43 of the connector 4 to press the sealing ring 6.

[0071] In other embodiments, besides using the nut 7 as a fastener, a cam (not shown in the figure) can also be used as a fastener. For example, the cam is located on the side of the housing 1 away from the sealing ring 6, and the cam is rotatably connected to the connector 4. When the cam is rotated, the rim of the cam slides against the housing 1 and presses against each other. The cam drives the annular limiting part 43 of the connector 4 to press the sealing ring 6. Furthermore, the cam can be provided with a lever, which allows maintenance personnel to rotate the cam relative to the connector 4 with less effort by moving the lever.

[0072] In some other embodiments, please refer to Figure 5 As shown, the connector 4 can also be directly threaded to the housing 1. When the connector 4 is rotated, the annular limiting part 43 of the connector 4 can drive the sealing ring 6 to move toward the housing 1, so that the sealing ring 6 is pressed against the housing 1 by the annular limiting part 43.

[0073] Please refer to Figure 5 As shown, the housing 1 may be provided with a countersunk hole, which can accommodate the sealing ring 6 and the annular limiting part 43. The countersunk hole and the annular limiting part 43 can be threaded together. The threaded connection structure between the countersunk hole and the annular limiting part 43 serves both a fastening function and a sealing function. Therefore, it relates to... Figure 5 The illustrated embodiment has a relatively high degree of sealing reliability.

[0074] The following content mainly describes the use of nut 7 to fasten connector 4 as an example.

[0075] In some embodiments, please refer to Figures 6-7 As shown, a first annular negative pressure chamber 62 can be provided on the side of the sealing ring 6 away from the annular limiting part 43, and the first annular negative pressure chamber 62 is negatively adsorbed onto the housing 1. Under this arrangement, the interaction force between the sealing ring 6 and the housing 1 includes not only the extrusion force in the front-back direction but also the negative pressure adsorption force in the front-back direction, so the sealing ring 6 and the housing 1 are reliably in close contact, and the sealing connection between the sealing ring 6 and the housing 1 has a relatively high degree of reliability.

[0076] The first annular negative pressure cavity 62 can also be understood as an annular concave structure.

[0077] In addition, regarding the reason for the generation of negative pressure adsorption force, it can be understood that when the sealing ring 6 is pressed against the housing 1 by the annular limiting part 43, the first annular negative pressure cavity 62 in contact with the housing 1 is deformed, and the gas in the first annular negative pressure cavity 62 is squeezed out. The gas pressure in the first annular negative pressure cavity 62 is less than the external gas pressure or hydraulic pressure. Under the action of pressure difference, the first annular negative pressure cavity 62 is negatively adsorbed onto the housing 1.

[0078] In some embodiments, please refer to Figures 6-7 As shown, a second annular negative pressure chamber 63 can be provided on the side of the sealing ring 6 near the annular limiting part 43, and the second annular negative pressure chamber 63 is negatively adsorbed onto the annular limiting part 43. With this arrangement, the interaction force between the sealing ring 6 and the annular limiting part 43 includes not only the extrusion force in the front-back direction but also the negative pressure adsorption force in the front-back direction, ensuring reliable and tight contact between the sealing ring 6 and the annular limiting part 43, resulting in a relatively high degree of reliability in the sealing connection between them.

[0079] The second annular negative pressure cavity 63 can also be understood as an annular concave structure.

[0080] In addition, regarding the reason for the generation of negative pressure adsorption force, it can be understood that when the sealing ring 6 is pressed by the annular limiting part 43, the second annular negative pressure chamber 63 in contact with the annular limiting part 43 deforms, and the gas in the second annular negative pressure chamber 63 is squeezed out. The gas pressure in the second annular negative pressure chamber 63 is lower than the external gas pressure or hydraulic pressure. Under the action of pressure difference, the second annular negative pressure chamber 63 is negatively adsorbed onto the annular limiting part 43.

[0081] In some embodiments, please refer to Figures 6-7 As shown, the inner circular wall 66 of the sealing ring 6, which encloses the through hole 61, can be provided with a third annular negative pressure cavity 64. When the sealing ring 6 is fitted onto the plug-in 4, the inner circular wall 66 of the sealing ring 6 and the cylindrical wall of the plug-in 4 can be interference-fitted. The inner circular wall 66 of the sealing ring 6 and the cylindrical wall of the plug-in 4 are pressed against each other, so that the third annular negative pressure cavity 64 is deformed and at least part of the gas originally located in the third annular negative pressure cavity 64 is discharged, so that the third annular negative pressure cavity 64 is negatively adsorbed onto the cylindrical wall of the plug-in 4, thereby making the sealing connection between the inner circular wall 66 of the sealing ring 6 and the cylindrical wall of the plug-in 4 relatively reliable.

[0082] The third annular negative pressure cavity 64 can also be understood as an annular recessed structure that contacts the cylindrical wall of the connector 4.

[0083] In some other embodiments (not shown in the figures), when the sealing ring is fitted onto the plug, the inner circular wall of the sealing ring and the cylindrical wall of the plug may not be interference-fitted. The inner circular wall of the sealing ring used to enclose and form the through hole may be provided with an annular recess structure. This annular recess structure may not contact the cylindrical wall of the plug. This annular recess structure can be used to provide deformable space, so that when at least one of the first annular negative pressure chamber and the second annular negative pressure chamber mentioned above deforms, the stress inside the sealing ring can be released, thereby improving the service life of the sealing ring.

[0084] In some embodiments, the sealing ring 6 may simultaneously have the first annular negative pressure chamber 62 and the second annular negative pressure chamber 63 mentioned above, or the sealing ring 6 may simultaneously have the first annular negative pressure chamber 62 and the third annular negative pressure chamber 64 mentioned above, or the sealing ring 6 may have the first annular negative pressure chamber 62, the second annular negative pressure chamber 63 and the third annular negative pressure chamber 64 mentioned above, so as to generate a negative pressure adsorption force between the plug-in 4 and the sealing ring 6, and between the sealing ring 6 and the housing 1. When the plug-in 4 is threadedly connected to the nut 7 mentioned above, due to the negative pressure adsorption force, the possibility of the plug-in 4 rotating slightly relative to the housing 1 is relatively small. Even if the nut 7 rotates slightly relative to the plug-in 4, causing a reduction in the compressive force applied to the sealing ring 6 by the annular limiting portion 43 of the plug-in 4, the plug-in 4 and the sealing ring 6 are still negatively adsorbed together, and the sealing ring 6 is also negatively adsorbed together. Therefore, under the influence of the combination of the annular negative pressure chamber of the sealing ring 6 described above, the sealing reliability is still relatively high.

[0085] In some other embodiments (not shown in the figures), the sealing ring may not have a first annular negative pressure chamber, but the sealing ring may have at least one of a second annular negative pressure chamber and a third annular negative pressure chamber.

[0086] In some other embodiments (not shown in the figures), the sealing ring may not have a second annular negative pressure chamber, but the sealing ring may have at least one of a first annular negative pressure chamber and a third annular negative pressure chamber.

[0087] In some other embodiments (not shown in the figures), the sealing ring may not have a third annular negative pressure chamber, but the sealing ring may have at least one of a first annular negative pressure chamber and a second annular negative pressure chamber.

[0088] In some embodiments, please refer to Figure 6 As shown, the outer circular wall 67 of the sealing ring 6 may be provided with an annular recess 65. The annular recess 65 can be used to provide deformable space, so that when at least one of the first annular negative pressure chamber 62 and the second annular negative pressure chamber 63 mentioned above deforms, the stress inside the sealing ring 6 can be released, thereby improving the service life of the sealing ring 6.

[0089] In some embodiments, please refer to Figures 8-9As shown, the annular limiting part 43 may be provided with a first annular recessed structure 431. A partial structure of the sealing ring 6 may be located within the first annular recessed structure 431 so that the first annular recessed structure 431 can limit the sealing ring 6 and restrict the movement of the sealing ring 6 along its own radial direction. In addition, a portion of the outer circular wall of the sealing ring 6 can contact the first annular recessed structure 431. Therefore, the contact area between the sealing ring 6 and the annular limiting part 43 is relatively large, and the sealing reliability is relatively high.

[0090] In some embodiments, please refer to Figures 8-9 As shown, the housing 1 may be provided with a second annular recessed structure 1a. A partial structure of the sealing ring 6 is located within the second annular recessed structure 1a, so that the second annular recessed structure 1a can limit the movement of the sealing ring 6 in its radial direction. In addition, a portion of the outer circular wall of the sealing ring 6 can contact the second annular recessed structure 1a. Therefore, the contact area between the sealing ring 6 and the housing 1 is relatively large, and the sealing reliability is relatively high.

[0091] In some embodiments, please refer to Figure 10 As shown, the battery device may include two sealing rings 6 mentioned above, one of which is a first sealing ring 6a and the other is a second sealing ring 6b. The inner diameter (inner wall diameter) of the first sealing ring 6a is larger than the outer diameter (outer wall diameter) of the second sealing ring 6b, and the first sealing ring 6a surrounds the second sealing ring 6b. In this configuration, the negative pressure adsorption chambers of both the first sealing ring 6a and the second sealing ring 6b can perform negative pressure adsorption, thereby achieving a double sealing effect. In addition, according to the above configuration, a space 6c is formed between the inner wall of the first sealing ring 6a and the outer wall of the second sealing ring 6b. When the first sealing ring 6a and the second sealing ring 6b are pressed against the housing 1 by the annular limiting part 43 of the connector 4, the gas in the space 6c is also squeezed out, and the space 6c is also in a negative pressure state. That is, the space 6c can also serve as a negative pressure adsorption chamber to further improve the sealing reliability.

[0092] In some embodiments, please refer to Figure 11As shown, the side of the annular limiting part 43 facing the first sealing ring 6a and the second sealing ring 6b is a beveled part 432. The distance H between the beveled part 432 and the housing 1 in the front-rear direction gradually increases along the direction from the second sealing ring 6b to the first sealing ring 6a. During installation, as the annular limiting part 43 moves forward to approach the housing 1, the annular limiting part 43 and the housing 1 can first squeeze the second sealing ring 6b, and then squeeze the first sealing ring 6a. This first discharges the gas in the negative pressure adsorption chamber of the second sealing ring 6b, then discharges the gas in the interval space 6c, and finally discharges the gas in the negative pressure adsorption chamber of the first sealing ring 6a. This achieves the effect of orderly gas discharge, ensuring that each negative pressure adsorption chamber can perform a good negative pressure adsorption function.

[0093] From a front-to-back perspective, the inclined surface 432 can be considered as the annular inclined surface of a frustum structure.

[0094] In addition, in such Figure 11 In the cross-sectional view shown, the inclined portion 432 and the housing 1 can have a set included angle α, which is in the range of 1° to 5°. Specifically, the included angle α can be 1°, 2°, 3°, 4°, or 5°. When the included angle α is in the range of 1° to 5°, the inclined portion 432 is not excessively inclined. Under the premise of ensuring that both the first sealing ring 6a and the second sealing ring 6b can provide a good sealing effect, the difference between the clamping force borne by the first sealing ring 6a from the annular limiting portion 43 and the housing 1 and the clamping force borne by the second sealing ring 6b from the annular limiting portion 43 and the housing 1 is relatively small. In other words, the clamping force borne by the second sealing ring 6b is not excessively greater than the clamping force borne by the first sealing ring 6a, thereby ensuring that the second sealing ring 6b is not crushed.

[0095] In some other embodiments, the housing 1 may also have a sloped structure (not shown in the figure). The sloped structure of the housing 1 and the sloped part 432 of the annular limiting part 43 can be symmetrically arranged in the front-back direction. The distance H between the sloped part 432 of the annular limiting part 43 and the sloped structure of the housing 1 in the front-back direction gradually increases along the direction from the second sealing ring 6b to the first sealing ring 6a. During the installation process, the effect of orderly gas discharge can be achieved to ensure that each negative pressure adsorption chamber can play a good negative pressure adsorption role.

[0096] From a front-to-back perspective, the inclined structure of shell 1 can be regarded as the annular inclined surface of a frustum-shaped structure.

[0097] In some embodiments, please refer to Figure 12As shown, a portion of the inner circular wall of the first sealing ring 6a is connected to a portion of the outer circular wall of the second sealing ring 6b via a connecting strip 6d. This arrangement maintains a distance between the inner circular wall of the first sealing ring 6a and the outer circular wall of the second sealing ring 6b, thereby reliably forming a space 6c with a negative pressure adsorption effect. This also facilitates the joint operation of the first sealing ring 6a and the second sealing ring 6b by maintenance personnel during assembly and disassembly.

[0098] The number of connecting strips 6d can be at least two, and at least two connecting strips 6d are arranged in a circumferential array relative to the inner circular wall of the first sealing ring 6a or the outer circular wall of the second sealing ring 6b.

[0099] In addition, the first sealing ring 6a, the second sealing ring 6b, and the connecting strip 6d can be integrally formed or snap-fitted together.

[0100] In some other embodiments (not shown in the figures), the inner circular wall of the first sealing ring may have at least two circumferentially arrayed bosses protruding from it, the top of which abuts against the outer circular wall of the second sealing ring. Alternatively, the outer circular wall of the second sealing ring may have at least two circumferentially arrayed bosses protruding from it, the top of which abuts against the inner circular wall of the first sealing ring. The presence of these bosses also allows the inner circular wall of the first sealing ring and the outer circular wall of the second sealing ring to maintain a distance between them, thereby reliably forming a space with a negative pressure adsorption effect. Accordingly, the first and second sealing rings can be separated during disassembly.

[0101] In some embodiments, both the sealing ring 6 and the annular limiting portion 43 can be located within the immersion chamber 111. With this configuration, the sealing ring 6 can be protected by the immersion liquid within the immersion chamber 111, and the sealing ring 6 is less susceptible to the effects of temperature, moisture, ultraviolet radiation, air, or dust outside the immersion chamber 111, resulting in a relatively long service life for the sealing ring 6.

[0102] In some other embodiments (not shown in the figures), the sealing ring and the annular limiting portion may also be located outside the immersion chamber. Having the sealing ring outside the immersion chamber provides the advantage of facilitating its replacement by maintenance personnel.

[0103] In some embodiments, the thickness of the sealing ring 6 in the front-to-back direction can be in the range of 2mm to 20mm, wherein the thickness can specifically be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0104] In some embodiments, the sealing ring 6 may be a circular sealing ring, while in other embodiments (not shown in the figures), the sealing ring may be a rectangular circular sealing ring.

[0105] In some embodiments, please refer to Figure 13 As shown, the battery device may further include an outer cover 81, which covers a portion of the outer wall of the housing 1, and the battery management unit 5 is located inside the outer cover 81. The outer cover 81 is used to protect the battery management unit 5 from impact by external foreign objects.

[0106] Please refer to Figure 13 As shown, the outer cover 81 is provided with an opening 811, which allows external data transmission cables to be connected to the battery management unit 5 via the opening 811.

[0107] Additionally, please refer to Figure 13 As shown, the top of the outer cover 81 is rotatably connected to the housing 1, and the outer cover 81 can be made of, for example, Figure 13 The position shown is rotated relative to the housing 1 in the rotation direction Z so that the outer cover 81 is located in a position not covered by the battery management unit 5, thereby facilitating the separation or assembly of the battery management unit 5 and the connector 4.

[0108] In addition, please refer to Figure 13 As shown, when the outer cover 81 is placed over the battery management unit 5, the outer cover 81 and the housing 1 can also be snapped or magnetically connected to restrict the outer cover 81 from rotating in the rotation direction Z, thereby reliably placing the outer cover 81 over the battery management unit 5. If the outer cover 81 is snapped over the housing 1, either the outer cover 81 or the housing 1 can be provided with a snap-on protrusion, and the other can be provided with a snap-on groove, with the snap-on protrusion and the snap-on groove engaging. If the outer cover 81 is magnetically connected to the housing 1, both the outer cover 81 and the housing 1 can be provided with ferromagnetic materials, and the two ferromagnetic materials are magnetically connected.

[0109] In some embodiments, please refer to Figure 14 As shown, the battery device may further include a secondary housing 82, which is provided with a receiving cavity 821 and a secondary through hole. The battery management unit (not shown in the figure) may be located in the receiving cavity 821. The battery device may further include a secondary connector 4a, which is disposed through the secondary through hole so that the secondary connector 4a extends from inside the receiving cavity 821 to outside the receiving cavity 821. The battery management unit is electrically connected to the connector 4 through the secondary connector 4a. The secondary connector 4a is electrically connected to the integrated busbar (not shown in the figure) located in the immersion cavity 111 through the connector 4, so that the battery management unit can receive the working signal collected by the integrated busbar.

[0110] The connection structure between the sub-connector 4a and the connector 4 can be a male-female plug-in mating structure. When it is necessary to maintain and replace the battery management unit, the sub-connector 4a and the connector 4 can be directly separated.

[0111] In addition, the connection structure between the secondary connector 4a and the connector 4 can be a standard plug-in mating structure, so that different models of integrated busbars and different models of battery management units can be adapted to each other through the secondary connector 4a and the connector 4. That is, the secondary connector 4a and the connector 4 can act as adapters.

[0112] Furthermore, the secondary connector 4a and the secondary housing 82 can also be sealed together by the sealing ring 6, and the secondary connector 4a and the secondary housing 82 can also be fastened together by the nut 7. Accordingly, the specific structure of the secondary connector 4a can be referred to as follows: Figure 3 The structure shown is that of connector 4.

[0113] In some embodiments, the receiving cavity 821 of the sub-housing 82 can also be used to contain immersion liquid, and the immersion liquid located in the receiving cavity 821 can be used for heat exchange with the battery management unit so that the temperature of the battery management unit is within the normal operating temperature range.

[0114] In some other embodiments, the receiving cavity 821 of the sub-housing 82 may not be used to contain immersion liquid. The battery device may include a heat exchange tube (not shown in the figure), which may pass through the sub-housing 82 and is used to circulate a heat exchange medium to achieve heat exchange, thereby keeping the temperature of the battery management unit within its normal operating temperature range. Further, the heat exchange tube may also be a heat exchange tube connecting to the immersion cavity 111 inside the housing 1, and the immersion liquid may circulate within the heat exchange tube. The immersion liquid located in the heat exchange tube can achieve non-contact heat exchange with the battery management unit, while the immersion liquid located in the immersion cavity 111 can achieve contact heat exchange with the individual battery cells.

[0115] In some embodiments, please refer to Figure 15 As shown, the housing 1 may include a main housing 13 and a partition 14 connected to each other. The partition 14 is located inside the main housing 13, and the inner cavity 11 of the main housing 13 is divided by the partition 14 into an immersion chamber 111 and a dry chamber 112. The battery management unit (not shown) is located in the dry chamber 112. A connector 4 passes through the main housing 13 and the partition 14 so that the connector 4 extends from the immersion chamber 111 to the dry chamber 112. The integrated busbar (not shown) located in the immersion chamber 111 can be electrically connected to the battery management unit located in the dry chamber 112 through the connector 4.

[0116] In some embodiments, please refer to Figure 16 As shown, the main housing 13 may include a mating portion 131 protruding into the inner cavity 11. The mating portion 131 is provided with a first through hole 121, and the separator 14 is provided with a second through hole 122. The first through hole 121 and the second through hole 122 are aligned, and the first through hole 121 and the second through hole 122 are combined to form a through hole 12. This through hole 12 can be used as follows: Figure 15The connector 4 is inserted so that the mating part 131 can be fixedly connected to the separator 14 via the connector 4. For example, the connector 4 and the separator 14 can be threaded together. When the connector 4 is rotated, the connector 4 applies a force in the front-to-back direction to the mating part 131, thereby fixing the mating part 131 and the separator 14 relatively. With the above structural arrangement, the connector 4 can not only be used to transmit working signals, but also to fix the main housing 13 and the separator 14.

[0117] In some other embodiments, the plug 4 is threadedly connected to the separator 14, and the plug 4 can also be threadedly connected to the mating part 131.

[0118] In some other embodiments, the connector 4 and the separator 14 may not be threaded together, and the connector 4 and the mating part 131 may also not be threaded together. The connector 4 and the nut may be threaded together. A portion of the connector 4 is located in the immersion chamber 111, and the nut may be located in the dry chamber 112. When the nut is rotated, the portion of the connector 4 located in the immersion chamber 111 and the nut located in the dry chamber 112 press the mating part 131 and the separator 14 in the front-back direction, thereby fixing the mating part 131 and the separator 14 relatively.

[0119] In some embodiments, please refer to Figure 15 As shown, the sealing ring 6 surrounding the connector 4 can be pressed against the mating portion 131 by the connector 4 to achieve a sealing effect. This can be understood based on the various embodiments of the sealing ring 6 described above. Figure 15 The sealing ring 6 shown, and the various embodiments of the connector 4 described above, can be understood as follows: Figure 15 The connector 4 shown here will not be described in detail here.

[0120] In some embodiments, please refer to Figures 15-18 As shown, the mating part 131 may be provided with at least two first through holes 121, the separator 14 may be provided with at least two second through holes 122, and the battery device may include at least two connectors 4. Each first through hole 121 and the corresponding second through hole 122 is penetrated by the corresponding connector 4. In this configuration, the mating part 131 can be fixedly connected to the separator 14 through at least two connectors 4 to achieve a reliable fixed connection.

[0121] When at least two groups of battery cells are provided in the immersion chamber 111, at least two integrated busbars are also required in the immersion chamber 111. Each integrated busbar is used to collect the working signals of the corresponding group of battery cells, and each connector 4 can be used to transmit the working signals collected by the corresponding integrated busbar, so that different working signals are transmitted to the same battery management unit.

[0122] In some embodiments, a sealant (not shown) may be provided between the mating part 131 and the separator 14. The sealant is used to seal the assembly gap between the mating part 131 and the separator 14, reducing the possibility of the immersion liquid in the immersion chamber 111 leaking into the dry chamber 112.

[0123] In some embodiments, please refer to Figure 19 As shown, a sealing gasket (e.g., at least one of a first sealing gasket 134a and a second sealing gasket 134b) can be provided between the mating part 131 and the partition 14. Both the side of the sealing gasket facing the mating part 131 and the side of the sealing gasket facing the partition 14 can be provided with an annular negative pressure cavity, which can be understood as an annular recessed structure. When the mating part 131 and the partition 14 are pressed against each other in the front-back direction, the gas in the annular negative pressure cavity of the sealing gasket is discharged, and the annular negative pressure cavity of the sealing gasket is in a negative pressure state, so that the mating part 131 and the sealing gasket are negatively attracted, and the partition 14 and the sealing gasket are negatively attracted, thereby improving the sealing reliability. The sealing gasket located between the mating part 131 and the partition 14 can be similar to... Figure 6 The structure of the sealing ring 6 shown will not be described in detail here.

[0124] Please refer to Figure 19 As shown, two sealing gaskets, such as a first sealing gasket 134a and a second sealing gasket 134b, can be provided between the mating part 131 and the separator 14 to increase the sealing reliability. The first sealing gasket 134a surrounds the second sealing gasket 134b, and the first sealing gasket 134a and the second sealing gasket 134b are spaced apart. The space between the first sealing gasket 134a and the second sealing gasket 134b can avoid the insertion member 4.

[0125] In some other embodiments (not shown in the figures), the connector may not pass through the mating portion of the main housing; instead, it may pass through the partition, i.e., the partition may have a through hole through which the connector passes. Alternatively, the connector may not pass through the partition of the main housing; instead, it may pass through the mating portion of the main housing, i.e., the mating portion of the main housing may have a through hole through which the connector passes. Accordingly, the mating portion of the main housing and the partition can be fastened together by a bolt assembly.

[0126] In some embodiments, please refer to Figure 20As shown, the housing 1 may include a first housing 15 and a second housing 16. The first housing 15 is provided with an immersion chamber 111 and a through window. The second housing 16 passes through the window and the first housing 15 and the second housing 16 are sealed together. The second housing 16 is provided with a through hole and a dry chamber 112 is provided inside the second housing 16. The connector 4 extends from the immersion chamber 111 through the through hole into the dry chamber 112. The battery management unit (not shown) may be located in the dry chamber 112 so that the integrated busbar (not shown) located in the immersion chamber 111 can be electrically connected to the battery management unit located in the dry chamber 112 through the connector 4.

[0127] Please refer to Figure 20 As shown, the second housing 16 may include a detachably connected main body 161 and a cover 162. The main body 161 is provided with a dry cavity 112, and the cover 162 covers the dry cavity 112 to make the dry cavity 112 relatively closed. The main body 161 passes through the window of the first housing 15 and is provided with a through hole through which the connector 4 passes. Maintenance personnel can remove the cover 162 from the main body 161 to maintain the battery management unit located in the dry cavity 112.

[0128] In some embodiments, please refer to Figure 20 As shown, the battery device may also include a sealing gasket 9, which has a through hole. The second housing 16 passes through the through hole. The outer wall of the second housing 16 includes an annular limiting structure 161a. The sealing gasket 9 is pressed against the first housing 15 by the annular limiting structure 161a, so that the assembly gap between the first housing 15 and the second housing 16 is sealed by the sealing gasket 9, thereby reducing the possibility of immersion liquid leaking from the immersion cavity 111 to the outside of the housing 1.

[0129] Please refer to Figure 20 As shown, when the second housing 16 includes the body 161 and the cover 162 mentioned above, the body 161 passes through the through hole of the sealing gasket 9, and the outer wall of the body 161 includes an annular limiting structure 161a.

[0130] Additionally, please refer to Figure 20 As shown, the battery device may also include a fastening nut 9a, which is threadedly connected to the main body 161. When the fastening nut 9a is rotated, the annular limiting structure 161a of the main body 161 can press the sealing gasket 9 against the first housing 15, thereby achieving a seal. In some other embodiments (not shown in the figure), the battery device may not include a fastening nut, and the first housing and the main body may be directly threaded together. When the main body is rotated, the annular limiting structure of the main body can press the sealing gasket against the first housing, thereby achieving a seal.

[0131] In some embodiments, please refer to Figure 21As shown, a first annular negative pressure chamber 91 is provided on the side of the sealing gasket 9 facing away from the annular limiting structure 161a. The first annular negative pressure chamber 91 is negatively attracted to the first housing 15. With this arrangement, the sealing gasket 9 is in close contact with the first housing 15, and the sealing reliability is relatively high.

[0132] In some embodiments, please refer to Figure 21 As shown, a second annular negative pressure chamber 92 is provided on the side of the sealing gasket 9 near the annular limiting structure 161a. The second annular negative pressure chamber 92 is negatively attracted to the annular limiting structure 161a. With this arrangement, the sealing gasket 9 is in close contact with the second housing 16, and the sealing reliability is relatively high.

[0133] Understandably, the structure of the sealing gasket 9 can be similar to the structure of the sealing ring 6 mentioned above. Correspondingly, the sealing function of the sealing gasket 9 can refer to the sealing function of the sealing ring 6 mentioned above. The difference is that the sealing object of the sealing gasket 9 is different from the sealing object of the sealing ring 6 mentioned above.

[0134] In some embodiments, the sealing gasket 9 and the annular limiting structure 161a may be located within the immersion chamber 111. When the sealing gasket 9 is located within the immersion chamber 111, the sealing gasket 9 is less susceptible to the effects of temperature, moisture, ultraviolet radiation, air, or dust outside the housing 1, and the service life of the sealing gasket 9 is relatively long.

[0135] In some other embodiments (not shown in the figures), the gasket and annular retaining structure may also be located outside the housing, which facilitates maintenance personnel in replacing and maintaining the gasket located outside the housing.

[0136] In some embodiments, please refer to Figure 22 As shown, the first end 41 of the connector 4 located within the immersion cavity 111 may include at least two first connectors 411. Please refer to... Figure 23 As shown, the second end 42 of the connector 4 located outside the immersion chamber 111 may include at least two second connectors 421. In this configuration, the signal output terminals of at least two integrated busbars can be plugged into and electrically connected to at least two first connectors 411 within the immersion chamber 111, and the at least two second connectors 421 can be plugged into and electrically connected to at least two signal receiving terminals of the battery management unit outside the immersion chamber 111. Therefore, the number of connectors 4 that need to penetrate the housing 1 is relatively small, and correspondingly, the number of sealing structures required is relatively small, resulting in a relatively high level of sealing reliability.

[0137] For example, the battery device can have a connector 4 that integrates multiple connectors, and correspondingly, the battery device can have a sealing structure for the connector 4 that integrates multiple connectors.

[0138] Please refer to Figure 22 As shown, among some of the first connectors 411 of the connector 4, a portion of the first connectors 411 can be plugged into and electrically connected to the signal output terminal of the integrated busbar, while another portion of the first connectors 411 can also be plugged into and electrically connected to the connectors of conductive components (e.g., copper busbars) located within the immersion chamber 111. These conductive components are electrically connected to individual battery cells and are used to transmit current, enabling the battery cells to release electrical energy to or obtain electrical energy from external circuits. Of course, other electrical components located within the immersion chamber 111 (e.g., electric pumps, temperature sensors, pressure sensors) can also be plugged into a portion of the first connectors 411. Please refer to... Figure 23 As shown, among some of the second connectors 421 of the connector 4, a portion of the second connectors 421 can be plugged into and electrically connected to the signal receiver of the battery management unit, while another portion of the second connectors 421 can also be plugged into and electrically connected to the connector of an external cable located outside the immersion chamber 111. The battery device can be electrically connected to other battery devices via the external cable, or the battery device can be electrically connected to an external power grid via the external cable. Of course, other electrical components located outside the immersion chamber 111 (e.g., microcontrollers, fuses, control switches) can also be plugged into a portion of the second connectors 421. It is understood that... Figures 22-23 The connector 4 shown, which integrates multiple interfaces, can be a multi-functional connector that can transmit electrical energy, detection signals, and control signals.

[0139] In some other embodiments (not shown in the figures), the battery device may include at least two connectors, the first end of the connector located within the immersion chamber may include a first connector, and the second end of the connector located outside the immersion chamber may include a second connector.

[0140] In some embodiments, the housing 1 may be composed of multiple structural components, to Figure 1 Taking the housing 1 shown as an example, the housing 1 may include a top cover and a box body distributed in the vertical direction. The top cover and the box body are sealed together and enclose to form an immersion cavity 111. The connector 4 may be inserted through the top cover or the box body.

[0141] In some embodiments, the housing 1 may be composed of multiple structural components, to Figure 15 Taking the housing 1 shown as an example, the housing 1 may include an upper cover and a box body distributed in the vertical direction. The upper cover and the box body are sealed together and enclose to form an immersion cavity 111. The upper cover may include a portion of the mating part 131, and the lower cover may include another portion of the mating part 131. The mating part 131 on the upper cover and the mating part 131 on the lower cover may be sealed together with sealant.

[0142] In some embodiments, the housing 1 may be composed of multiple structural components, to Figure 20Taking the housing 1 shown as an example, the first housing 15 may include a top cover and a box body distributed in the vertical direction. The top cover and the box body are sealed together and enclose to form an immersion cavity 111. The top cover may be provided with a window that is penetrated by the second housing 16, or the box body may be provided with a window that is penetrated by the second housing 16.

[0143] Secondly, this application provides some embodiments of an energy storage system, which includes an inverter, a battery management system (BMS), and at least one battery device described above.

[0144] An inverter converts direct current (DC) to alternating current (AC). Inverters offer advantages such as high conversion efficiency, fast start-up speed, and high safety, and also provide protection against short circuits, overloads, over / under voltage, and over-temperature. A battery management system (BMS) ensures the battery device operates within a safe operating range. It controls the charging and discharging power of the battery device based on factors such as ambient temperature, battery status, and power demand, improving battery safety and optimizing its operating state, thereby extending battery range and lifespan. A battery device may include a battery management unit (BMU). In energy storage systems comprising at least two battery devices, the BMS can connect to at least two BMUs to control and monitor the status of both battery devices.

[0145] The energy storage system can specifically be an energy storage box (also known as a large energy storage device, suitable for large-scale industrial production or power distribution and other technical fields). The energy storage box includes an energy storage box body, which has a housing space. The inverter, battery management system and battery device are all located inside the energy storage box body.

[0146] The energy storage system can specifically be an energy storage cabinet (also known as an industrial and commercial energy storage device, suitable for small industrial and commercial power needs). The energy storage cabinet includes an energy storage cabinet body, which has a housing space. The inverter, battery management system and battery device are all located in the energy storage cabinet body.

[0147] Thirdly, this application provides some embodiments of electrical equipment, which may also be referred to as an electrical system. Electrical equipment may include the battery device described above, and may be devices that utilize electrical energy, such as trams, power grids, or household appliances.

[0148] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, The battery device includes a housing, an integrated busbar, a connector, a battery management unit, and at least two battery cells. The housing has an immersion chamber, in which the battery cells and the integrated busbar are located. The immersion chamber is used to contain immersion liquid. The battery management unit is located outside the immersion chamber. The housing has a through hole, through which the connector extends from inside the immersion chamber to outside. The integrated busbar is electrically connected to the battery management unit through the connector.

2. The battery device according to claim 1, characterized in that, The battery device also includes a sealing ring with a through hole. The connector passes through the through hole and includes an annular limiting part. The sealing ring is pressed against the housing by the annular limiting part.

3. The battery device according to claim 2, characterized in that, A first annular negative pressure cavity is provided on the side of the sealing ring away from the annular limiting part, and the first annular negative pressure cavity is negatively adsorbed onto the shell. And / or, a second annular negative pressure chamber is provided on the side of the sealing ring near the annular limiting part, and the second annular negative pressure chamber is negatively attracted to the annular limiting part.

4. The battery device according to claim 3, characterized in that, The battery device includes two sealing rings, one of which is a first sealing ring and the other is a second sealing ring. The inner diameter of the first sealing ring is larger than the outer diameter of the second sealing ring, and the first sealing ring surrounds the second sealing ring.

5. The battery device according to claim 4, characterized in that, A portion of the inner circular wall of the first sealing ring is connected to a portion of the outer circular wall of the second sealing ring via a connecting strip.

6. The battery device according to any one of claims 2 to 5, characterized in that, The sealing ring and the annular limiting part are both located inside the immersion cavity, or the sealing ring and the annular limiting part are both located outside the immersion cavity.

7. The battery device according to any one of claims 2 to 5, characterized in that, The battery device also includes fasteners, the connector is fixedly connected to a portion of the structural wall of the housing by the fasteners, and the sealing ring is pressed against the portion of the structural wall of the housing by the annular limiting part.

8. The battery device according to any one of claims 1 to 5, characterized in that, The battery device also includes an external cover, which covers a portion of the outer wall of the housing, and the battery management unit is located inside the external cover.

9. The battery device according to any one of claims 1 to 5, characterized in that, The battery device further includes a secondary housing, which has a receiving cavity and a secondary through hole. The battery management unit is located in the receiving cavity. The battery device also includes a secondary connector, which passes through the secondary through hole so that the secondary connector extends from inside the receiving cavity to outside the receiving cavity. The battery management unit is electrically connected to the connector through the secondary connector.

10. The battery device according to claim 9, characterized in that, The accommodating cavity is used to contain the immersion liquid.

11. The battery device according to any one of claims 1 to 5, characterized in that, The housing includes a main housing and a separator. The separator is located inside the main housing. The inner cavity of the main housing is divided by the separator into an immersion chamber and a dry chamber. The battery management unit is located in the dry chamber. The connector extends from the immersion chamber to the dry chamber.

12. The battery device according to claim 11, characterized in that, The main housing includes a mating part that protrudes into the inner cavity. The mating part is provided with a first through hole, and the partition is provided with a second through hole. The first through hole and the second through hole are aligned and both are penetrated by the plug-in. The mating part is fixedly connected to the partition through the plug-in.

13. The battery device according to claim 12, characterized in that, The mating part is provided with at least two first through holes, the separator is provided with at least two second through holes, and the battery device includes at least two plug-in members, with each first through hole and the corresponding second through hole being penetrated by the corresponding plug-in member.

14. The battery device according to any one of claims 1 to 5, characterized in that, The housing includes a first housing and a second housing. The first housing has an immersion chamber and a through window. The second housing passes through the window and is sealed to the first housing. The second housing has a through hole and a dry chamber. The connector extends from the immersion chamber through the through hole into the dry chamber. The battery management unit is located in the dry chamber.

15. The battery device according to claim 14, characterized in that, The battery device further includes a sealing gasket with a through hole, through which the second housing passes. The outer wall of the second housing includes an annular limiting structure, and the sealing gasket is pressed against the first housing by the annular limiting structure.

16. The battery device according to claim 15, characterized in that, The sealing gasket is provided with a first annular negative pressure cavity on the side opposite to the annular limiting structure, and the first annular negative pressure cavity is negatively adsorbed onto the first housing. And / or, a second annular negative pressure cavity is provided on one side of the sealing gasket near the annular limiting structure, and the second annular negative pressure cavity is negatively adsorbed onto the annular limiting structure.

17. The battery device according to any one of claims 1 to 5, characterized in that, The connector includes at least two first connectors located within the immersion chamber, and at least two second connectors located outside the immersion chamber.

18. An energy storage system, characterized in that, The energy storage system includes the battery device according to any one of claims 1 to 17.

19. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to any one of claims 1 to 17.

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