Battery monomer, battery device, energy storage device and power utilization device

Abstract

The utility model belongs to the technical field of battery production, and provides a single battery, a battery device, an energy storage device and a power utilization device.The single battery comprises a shell, a first sealing piece and a second sealing piece, a containing cavity is formed in the shell, the shell is provided with an assembling face, and the assembling face is provided with a first sealing groove and a second sealing groove with the groove depths in the first direction; the first sealing groove and the second sealing groove are communicated in the second direction, the first direction is perpendicular to the second direction, and a liquid injection hole communicated with the containing cavity is formed in the groove bottom face of the first sealing groove; the first sealing piece is inserted into the liquid injection hole and seals the liquid injection hole; the second sealing piece is inserted into the first sealing groove from the second sealing groove in the second direction, the second sealing piece is limited in the first sealing groove in the first direction, and the second sealing piece abuts against and limits the first sealing piece. The utility model aims to improve the sealing effect of the orifice of the liquid injection hole of the battery monomer.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a battery cell, a battery device, an energy storage device and an electrical device. Background Art

[0002] When lithium-ion batteries are produced, workers need to add electrolyte into the lithium-ion battery through the injection hole and then seal the opening of the injection hole.

[0003] In the related art, the periphery of the orifice of the injection hole is directly welded and sealed. Since electrolyte is likely to remain around the orifice, welding may cause the electrolyte to vaporize and form welding explosion points, thus affecting the air tightness of the welding. Utility Model Content

[0004] The purpose of the present application is to provide a battery cell, a battery device, an energy storage device and an electrical device, aiming to solve the technical problem of poor sealing effect of the orifice of the injection hole of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising:

[0006] A housing having an accommodating cavity therein, the housing having an assembly surface, the assembly surface having a first sealing groove and a second sealing groove, both of which have a groove depth along a first direction, the first sealing groove and the second sealing groove are arranged to be interlinked in the second direction, the first direction is perpendicular to the second direction, and the bottom surface of the first sealing groove has a liquid injection hole connected to the accommodating cavity;

[0007] A first sealing member is inserted into the liquid injection hole and seals the liquid injection hole;

[0008] The second sealing member is inserted into the first sealing groove along the second direction through the second sealing groove. In the first direction, the second sealing member is limited in the first sealing groove and abuts against the first sealing member.

[0009] In this embodiment, the first seal is inserted into the injection hole to seal the injection hole, and the second seal is inserted into the first sealing groove from the lateral second sealing groove to abut the first seal to limit the first seal, so that the first seal is not easy to fall out of the injection hole. At the same time, the second seal is limited in the first sealing groove, so that the second seal limits the first seal more firmly and reliably, reducing the risk of the first seal falling out of the injection hole; furthermore, the second seal limits the first seal so that there is no need for welding sealing between the first seal and the injection hole, so that the problem of welding explosion point is not easy to occur, reducing the risk of sealing failure.

[0010] In one embodiment, the battery cell further includes a fixing structure connected between the second sealing member and the housing.

[0011] In this embodiment, by adding a fixing structure, the reliability of the connection between the second sealing member and the housing is improved, thereby improving the sealing reliability of the first sealing member on the injection hole.

[0012] In one embodiment, the second sealing member is fixed to the housing by welding.

[0013] In this embodiment, the second sealing member and the housing are further fixed by welding, which is beneficial to improve the reliability of the connection between the second sealing member and the housing, and further improve the sealing reliability of the first sealing member on the injection hole.

[0014] In one embodiment, a first limiting structure is connected to the groove wall of the first sealing groove, and a second limiting structure is connected to the second sealing member. The first limiting structure and the second limiting structure are plugged together along the second direction.

[0015] In this embodiment, the first limiting structure and the second limiting structure are plugged together for limiting, which has a simple structure and is easy to manufacture. While limiting, it also has the function of guiding the second sealing member to enter the first sealing groove.

[0016] In one embodiment, any one of the first limiting structure and the second limiting structure is a groove structure, and the other is a protrusion structure. The notch of the groove structure extends along the second direction, and along the second direction, the protrusion structure is plugged into and matched with the groove structure.

[0017] In this embodiment, the layout positions of the groove structure and the protrusion structure are more flexible and can be adaptively selected according to the convenience of actual processing. The groove structure and the protrusion structure are plugged into each other, which not only limits the position but also has a guiding function, and the connection is convenient and reliable.

[0018] In one embodiment, the groove structure is a dovetail groove, and the shape of the protrusion structure matches the dovetail groove and is plugged into and matched with the dovetail groove.

[0019] In this embodiment, the dovetail groove can improve the accuracy and stability of the guide, reduce vibration and shaking noise, etc. On the other hand, it can also save the space occupied by the groove and improve the space utilization.

[0020] In one embodiment, the second sealing member extends in a columnar shape along the first direction, and the surface of the second sealing member on the side facing away from the bottom surface of the first sealing groove is in a semicircular arc shape. The second sealing member forms a protruding structure at two edges perpendicular to the first direction; two opposite groove walls of the first sealing groove match the protruding structure to form a groove structure.

[0021] In this embodiment, the second sealing member is limited in position by forming a semicircular curved surface on one side of the second sealing member facing away from the bottom of the first sealing groove and matching the groove wall of the first sealing groove.

[0022] In one embodiment, an end of the second sealing member close to the second sealing groove is provided with an outwardly convex or inwardly concave positioning structure.

[0023] In this embodiment, a positioning structure is provided on the second sealing member to facilitate rapid installation and removal of the second sealing member.

[0024] In one embodiment, the first sealing member includes a column and a cap connected to one end of the column, the column is inserted into the injection hole and has an interference fit with the injection hole, and the cap abuts against the bottom surface of the first sealing groove; the second sealing member abuts against the cap.

[0025] In this embodiment, the cap body can limit the column, making it difficult for the column to enter the accommodating cavity through the injection hole. The cap body can also increase the contact area with the second sealing member to increase the squeezing force on the second sealing member.

[0026] In one embodiment, a recessed groove is formed on the bottom surface of the first sealing groove, and the cap body matches the recessed groove and is plugged into and engaged with the recessed groove.

[0027] In this embodiment, the sink groove is used to position and limit the cap body, thereby improving the reliability of the connection between the second sealing member and the injection hole.

[0028] In one embodiment, the cap body forms a protruding outer convex portion outside the notch of the sink, and the second sealing member abuts against the outer convex portion.

[0029] In this embodiment, the outer protrusion protrudes outside the sink, which makes it easier for the second sealing member to squeeze the cap body, thereby improving the sealing effect.

[0030] In one embodiment, the cap body is elastic.

[0031] In this embodiment, the elastic cap body can improve the sealing performance of the liquid injection hole.

[0032] In one embodiment, one end of the column away from the cap body has an inserting surface, and the inserting surface is a spherical surface.

[0033] In this embodiment, the spherical plug-in end is more conducive to inserting the column into the injection hole, so as to reduce the scratching problem on the hole mouth and hole wall of the injection hole and reduce the risk of sealing leakage.

[0034] In one embodiment, the column is an elastic column.

[0035] In this embodiment, the elastic column can improve the sealing performance of the liquid injection hole.

[0036] In one embodiment, the housing includes a housing body and a cover body connected to the housing body, the cover body and the housing body together enclose a receiving cavity, and the assembly surface, the first sealing groove and the second sealing groove are all located on the cover body.

[0037] In this embodiment, the injection hole, the assembly surface, the first sealing groove and the second sealing groove are all arranged on the cover body. The cover body is generally flat and has a small volume and regular shape compared to the shell body, which is easier to process, thereby reducing the processing difficulty and improving work efficiency.

[0038] In a second aspect, the present application provides a battery device, the battery device comprising a battery cell as described in any one of the above items.

[0039] In a third aspect, the present application provides an energy storage device, comprising a plurality of battery cells or battery devices as described above, wherein the battery cells or battery devices are used to store or provide electrical energy.

[0040] In a fourth aspect, the present application provides an electrical device, comprising a battery cell as described above, a battery device as described above, and an energy storage device as described above, wherein the battery device is used to store or provide electrical energy.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0044] Figure 2 Schematic diagram of the exploded structure of the battery device provided in some embodiments of the present application Figure 1 ;

[0045] Figure 3 Schematic diagram of the exploded structure of a battery cell in a battery device provided in some embodiments of the present application Figure 1 ;

[0046] Figure 4 Schematic diagram of the exploded structure of a battery cell in a battery device provided in some embodiments of the present application Figure 2 ;

[0047] Figure 5 A schematic diagram of a structure in which a cover (or housing) is connected to a first sealing member and a second sealing member in a battery device provided in some embodiments of the present application;

[0048] Figure 6 A schematic diagram of the structure of a cover (or housing) in a battery device provided in some embodiments of the present application;

[0049] Figure 7 for Figure 6 CC section view in;

[0050] Figure 8 for Figure 5 AA cross-section Figure 1 ;

[0051] Fig. 9 for Figure 5 AA cross-section Figure 2 ;

[0052] Fig.10 for Figure 5 BB cutaway Figure 3 ;

[0053] Fig.11 Schematic diagram of the structure of the first sealing member in the battery device provided in some embodiments of the present application Figure 1 ;

[0054] Fig.12 A schematic diagram of a three-dimensional structure of a first sealing member in a battery device provided in some embodiments of the present application;

[0055] Fig.13 Schematic diagram of the structure of the first sealing member in the battery device provided in some embodiments of the present application Figure 2 ;

[0056] Fig.14 Schematic diagram of the structure of the second sealing member in the battery device provided in some embodiments of the present application Figure 1 ;

[0057] Fig.15 Schematic diagram of the structure of the first sealing member in the battery device provided in some embodiments of the present application Figure 2 ;

[0058] Fig.16 Schematic diagram of the structure of the first sealing member in the battery device provided in some embodiments of the present application Figure 3 ;

[0059] Fig.17 for Figure 5 AA cross-section Figure 3 .

[0060] Description of reference numerals:

[0061] 1000, vehicle; 1100, battery device; 1110, battery cell; 1111, housing; 11111, accommodating cavity; 11112, assembly surface; 11113, first sealing groove; 11114, second sealing groove; 11115, injection hole; 11116, sink; 11117, first part; 11118, second part; 11119, through-hole; 11120, first limiting structure; 1112, first sealing member; 11121, column; 1 1122, cap body; 11123, plug-in surface; 11124, elastic expansion portion; 11125, convex portion; 1113, second sealing member; 11131, second limiting structure; 11132, positioning structure; 1114, fixing structure; 1115, electrode assembly; 1120, box body; 1121, first structural portion; 1122, second structural portion; 1123, accommodating space; 1200, controller; 1300, motor; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0062] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only examples, and cannot be used to limit the scope of protection of the present application.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0064] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0065] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0066] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0067] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0068] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0069] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0070] Lithium-ion batteries are developing rapidly, especially lithium-ion batteries used as automotive power batteries. Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Lithium batteries are divided into lithium metal batteries and lithium-ion batteries. Among them, lithium-ion batteries do not contain metallic lithium and are rechargeable. They mainly rely on the movement of lithium ions between the positive and negative electrodes to work, that is, during the charging and discharging process, Li+ is embedded and de-embedded back and forth between the two electrodes: when charging, Li+ is de-embedded from the positive electrode and embedded in the negative electrode through the electrolyte (or electrolyte), and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

[0071] In the production process of lithium-ion batteries, workers need to add electrolyte into the lithium-ion battery through the injection hole and then seal the hole. However, in the related art, the outer periphery of the injection hole is directly welded and sealed. Since electrolyte is likely to remain on the outer periphery of the hole, welding will cause the electrolyte to vaporize and expand due to heat, and then form a welding explosion point at the end of welding, affecting the air tightness of the welding.

[0072] Therefore, the present application provides a battery cell, which provides a first seal and a second seal, so that the first seal is inserted into the injection hole to seal the injection hole, and then the second seal is inserted into the first sealing groove from the side of the second sealing groove to limit the first seal, and the second seal is limited on the outer shell at the same time, thereby completing the sealing of the injection hole. There is no need to weld the outer periphery of the injection hole to reduce the probability of forming an explosion point due to welding gasification, which is beneficial to improving the sealing of the injection hole.

[0073] Specifically, the embodiment of the present application provides a battery cell 1110, which refers to the smallest unit constituting the battery device 1100. Each battery cell 1110 may be a secondary battery cell 1110 or a primary battery cell 1110; it may also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 1110 may be cylindrical, flat, rectangular, or in other shapes.

[0074] Each battery cell 1110 includes one or more electrode assemblies 1115. The electrode assembly 1115 can be understood as a bare cell in the battery cell 1110. The electrode assembly 1115 is accommodated in the housing 1111 and is electrically connected to the pole. After the electrode assembly 1115 is accommodated in the housing 1111, the electrolyte can be poured into the interior of the housing 1111 through the injection hole 11115, and then the opening of the injection hole 11115 is sealed.

[0075] According to some embodiments of the present application, referring to Figure 3-8As shown, the embodiment of the present application provides a battery cell 1110, the battery cell 1110 includes a shell 1111, a first sealing member 1112 and a second sealing member 1113, wherein the shell 1111 has an accommodating cavity 11111 inside, the shell 1111 has an assembly surface 11112, the assembly surface 11112 has a first sealing groove 11113 and a second sealing groove 11114, both of which have a groove depth along a first direction X, in a second direction Y, the first sealing groove 11113 and the second sealing groove 11114 are interlinked, and the first sealing groove 11113 and the second sealing groove 11114 are interlinked. A direction X is perpendicular to a second direction Y, and a bottom surface of the first sealing groove 11113 has a liquid injection hole 11115 connected to the accommodating cavity 11111; the first sealing member 1112 is inserted into the liquid injection hole 11115 and seals the liquid injection hole 11115; the second sealing member 1113 is inserted into the first sealing groove 11113 along the second direction Y through the second sealing groove 11114, and in the first direction X, the second sealing member 1113 is limited in the first sealing groove 11113, and the second sealing member 1113 abuts against the first sealing member 1112 for limiting the position.

[0076] For the housing 1111, refer to Figure 3 and Figure 4 As shown, the housing 1111 may include two parts, namely, a first part 11117 and a second part 11118, the first part 11117 and the second part 11118 cover each other, and the first part 11117 and the second part 11118 jointly define a housing for accommodating the electrode assembly 1115. The second part 11118 may be a hollow structure with one end open, the first part 11117 may be a plate-like structure, the first part 11117 covers the open side of the second part 11118, so that the first part 11117 and the second part 11118 jointly define the accommodating cavity 11111; the first part 11117 and the second part 11118 may also both be hollow structures with one side open, and the open side of the first part 11117 covers the open side of the second part 11118. Of course, the housing 1111 formed by the first part 11117 and the second part 11118 may be in various shapes, such as a cylinder, a cuboid, etc.

[0077] It should be noted that the assembly surface 11112, the first sealing groove 11113 and the second sealing groove 11114 can be arranged on the first part 11117, or the assembly surface 11112, the first sealing groove 11113 and the second sealing groove 11114 can also be arranged on the second part 11118, that is, the first seal 1112 and the second seal 1113 can be connected to the first part 11117, or the first seal 1112 and the second seal 1113 can also be connected to the second part 11118.

[0078] Reference Figure 5 and Figure 6 As shown, an assembly surface 11112 is formed on the shell 1111, and the assembly surface 11112 can be a part of the surface of the shell 1111, and a first sealing groove 11113 and a second sealing groove 11114 are opened on the assembly surface 11112, and the groove depth directions of the first sealing groove 11113 and the second sealing groove 11114 are both along the first direction X. It can be seen that the first sealing groove 11113 and the second sealing groove 11114 are arranged side by side in a direction perpendicular to the first direction X, that is, the first sealing groove 11113 and the second sealing groove 11114 are arranged side by side in the second direction Y, and the second direction Y is perpendicular to the first direction X. The first sealing groove 11113 and the second sealing groove 11114 are penetrated in the second direction Y, and a through opening 11119 is formed at the position where the first sealing groove 11113 and the second sealing groove 11114 are penetrated. The through opening 11119 is the entrance for the second sealing component 1113 to be inserted into the first sealing groove 11113. Therefore, it can be known that the second sealing component 1113 can enter the first sealing groove 11113 along the second direction Y from the second sealing groove 11114.

[0079] Combination Figure 6 and Figure 7 As shown, the injection hole 11115 is a channel for the electrolyte to enter the accommodating cavity 11111 of the shell 1111. The injection hole 11115 is opened at the bottom of the first sealing groove 11113. The injection hole 11115 passes through the bottom surface of the first sealing groove 11113 to the accommodating cavity 11111.

[0080] Reference Figure 8-10 As shown, for the first sealing member 1112, the first sealing member 1112 is inserted into the injection hole 11115 to block and seal the opening of the injection hole 11115. Therefore, it can be known that the first sealing member 1112 and the injection hole 11115 can be inserted in an interference fit manner.

[0081] The second seal 1113 can be inserted into the first seal groove 11113 and limited in the first seal groove 11113. The second seal 1113 can abut and limit the first seal 1112 in the first seal groove 11113, so that the first seal 1112 is not easy to fall out of the injection hole 11115. Therefore, it can be known that the second seal 1113 abuts against the end position of the main control exposed outside the first seal 1112, and limits the first seal 1112 in the direction of falling out of the injection hole 11115.

[0082] Since the second sealing groove 11114 is interlinked with the first sealing groove 11113, the second sealing member 1113 is inserted into the first sealing groove 11113 from the second sealing groove 11114. It can be seen that the second sealing member 1113 is inserted into the first sealing groove 11113 from the side by side by side plugging. The side plugging method makes the structure of the second sealing member 1113 simpler, and the second sealing member 1113 can enter the first sealing groove 11113 without designing a complex elastic telescopic structure, which is conducive to simplifying the structure of the second sealing member 1113.

[0083] In this embodiment, the first sealing member 1112 is inserted into the injection hole 11115 to seal the injection hole 11115, and the second sealing member 1113 is inserted into the first sealing groove 11113 from the lateral second sealing groove 11114 to abut against the first sealing member 1112 to limit the first sealing member 1112, so that the first sealing member 1112 is not easy to fall out of the injection hole 11115. At the same time, the second sealing member 1113 is limited in the first sealing groove 11113, so that the limiting of the first sealing member 1112 by the second sealing member 1113 is more firm and reliable, thereby reducing the risk of the first sealing member 1112 falling out of the injection hole 11115; furthermore, the limiting of the first sealing member 1112 by the second sealing member 1113 makes it unnecessary to weld the first sealing member 1112 and the injection hole 11115, so that the problem of welding explosion point is not easy to occur, thereby reducing the risk of sealing failure.

[0084] In some embodiments, reference Figure 8 As shown, the battery cell 1110 further includes a fixing structure 1114 , and the fixing structure 1114 is connected between the second sealing member 1113 and the housing 1111 .

[0085] Specifically, the fixing structure 1114 is used to limit and fix the second sealing member 1113 on the housing 1111. For example, the fixing structure 1114 may be a riveted structure, a bolted structure, a snap-fit ​​structure, or a bolted structure.

[0086] After the second sealing member 1113 is connected to the outer shell 1111 through the fixing structure 1114, a detachable connection or a fixed connection can be realized between the second sealing member 1113 and the outer shell 1111. The second sealing member 1113 can be detached from the outer shell 1111, or the second sealing member 1113 can be connected to the outer shell 1111 to form an integral structure.

[0087] In this embodiment, by adding the fixing structure 1114 , the reliability of the connection between the second sealing member 1113 and the housing 1111 is improved, thereby improving the sealing reliability of the first sealing member 1112 to the injection hole 11115 .

[0088] In some embodiments, the second sealing member 1113 is fixed to the housing 1111 by welding.

[0089] Specifically, the second sealing member 1113 and the outer shell 1111 are fixed by welding, and the welding position is at the connection position between the second sealing member 1113 and the outer shell 1111. For example, the end of the second sealing member 1113 away from the first sealing member 1112 is welded between the outer shell 1111, so that the welding position is away from the opening of the injection hole 11115, thereby reducing the risk of the welding position touching the electrolyte, thereby reducing the occurrence of welding explosion point problems and improving the reliability of the seal.

[0090] In this embodiment, the second sealing member 1113 and the outer shell 1111 are further fixed by welding, which is beneficial to improve the reliability of the connection between the second sealing member 1113 and the outer shell 1111, and further improve the sealing reliability of the first sealing member 1112 to the injection hole 11115.

[0091] In some embodiments, reference Figure 7-10 As shown, a first limiting structure 11120 is connected to the groove wall of the first sealing groove 11113, and a second limiting structure 11131 is connected to the second sealing member 1113. In the second direction Y, the first limiting structure 11120 and the second limiting structure 11131 are plugged together.

[0092] It can be understood that the second sealing member 1113 and the housing 1111 are connected by means of plug-in limiting means, specifically, a first limiting structure 11120 is provided so that the first limiting structure 11120 is located on the groove wall of the first sealing groove 11113. The groove body shape of the first sealing groove 11113 can be rectangular, so it can be seen that the first sealing groove 11113 has two opposite groove walls, which are two opposite groove walls of the first sealing groove 11113 perpendicular to the first direction X and perpendicular to the second direction Y; therefore, one or two first limiting structures 11120 can be provided. When two first limiting structures 11120 are provided, the two first limiting structures 11120 can be respectively located on two opposite groove walls.

[0093] The second limiting structure 11131 is correspondingly arranged on the second sealing member 1113. The second sealing member 1113 is inserted into the first sealing groove 11113 through the through opening 11119. Two surfaces opposite to the groove wall of the first sealing groove 11113 are formed on the second sealing member 1113. One or both of the two surfaces are provided with the second limiting structure 11131. When the second sealing member 1113 is inserted into the first sealing groove 11113 through the through opening 11119 along the second direction Y, the first limiting structure 11120 and the second limiting structure 11131 are also plugged and matched in the second direction Y, so that the first limiting structure 11120 limits the second limiting structure 11131 in the first direction X, so that the second sealing member 1113 squeezes the first sealing member 1112 into the injection hole 11115.

[0094] In this embodiment, the first limiting structure 11120 and the second limiting structure 11131 are plugged together for limiting, which has a simple structure and is easy to manufacture. While limiting, it also has the function of guiding the second sealing member 1113 to enter the first sealing groove 11113.

[0095] In some embodiments, reference Figure 7-10 As shown, any one of the first limiting structure 11120 and the second limiting structure 11131 is a groove structure, and the other is a protrusion structure. The notch of the groove structure extends along the second direction Y, and along the second direction Y, the protrusion structure is plugged into and matched with the groove structure.

[0096] One of the ways is that the first limiting structure 11120 is a groove structure, and correspondingly, the second limiting structure 11131 is a protrusion structure, the groove structure is opened on the groove wall of the first sealing groove 11113 and extends along the second direction Y, and the extended end of the groove structure located on the side of the through opening 11119 forms an insertion interface for the protrusion structure to enter; the protrusion structure protrudes from the surface of the second sealing member 1113, and the protrusion structure extends along the second direction Y to form a certain length, so that the protrusion structure is plugged into and matched with the groove structure through the insertion interface.

[0097] Another way is that the first limiting structure 11120 is a protruding structure, and correspondingly, the second limiting structure 11131 is a groove structure, the protruding structure protrudes from the groove wall of the first sealing groove 11113 and extends along the second direction Y, and the protruding structure extends along the second direction Y to form a certain length; the groove structure is opened on the surface of the second sealing member 1113, and an extended end of the groove structure forms an insertion interface for the protruding structure to enter, so that the protruding structure is plugged into and matched with the groove structure through the insertion interface.

[0098] The cross-sectional outer contours of the groove structure and the protrusion structure match each other. For example, the cross-sectional outer contours of the groove structure and the protrusion structure may be arc-shaped, polygonal, etc. For example, the cross-sectional outer contours of the groove structure and the protrusion structure may be a part of a circular contour, a part of a rectangular contour, a part of a trapezoidal contour, etc. For example, the groove structure is a rectangular groove, and the shape of the protrusion structure matches the rectangular groove and is plugged into and matched with the rectangular groove.

[0099] The raised structure may be a continuously extending strip structure, with the length of the raised structure matching that of the groove structure; or, the raised structure may be an intermittent, non-continuous structure, with a spacing space formed between two adjacent raised structures, to reduce material usage and reduce the overall weight of the raised structure.

[0100] In this embodiment, the layout positions of the groove structure and the protrusion structure are more flexible and can be adaptively selected according to the convenience of actual processing. The groove structure and the protrusion structure are plugged into each other, which not only limits the position but also has a guiding function, and the connection is convenient and reliable.

[0101] In some embodiments, reference Fig. 9 As shown, the groove structure is a dovetail groove, and the shape of the protrusion structure matches the dovetail groove and is plugged into and matched with the dovetail groove.

[0102] The dovetail groove is a groove structure that is inclined relative to the groove wall, and the groove walls on both sides are reduced and approached at the groove opening. Correspondingly, the cross-sectional outer contour shape of the protruding structure should match the cross-sectional outer contour shape of the dovetail groove.

[0103] The dovetail groove is used as the guiding and limiting groove structure. On the one hand, it can improve the accuracy and stability of the guide and reduce vibration and shaking noise; on the other hand, it can also save the space occupied by the grooving and improve space utilization.

[0104] Regarding the shape of the second sealing member 1113, the second sealing member 1113 may be in a cubic shape, and the surface of the second sealing member 1113 is a combination of multiple planes. Of course, the second sealing member 1113 may also be in a columnar shape with an arc-shaped surface. Fig.16 and Fig.17 As shown, in some embodiments, the second sealing member 1113 extends in a columnar shape along the first direction X, and the surface of the second sealing member 1113 on the side of the groove bottom surface facing away from the first sealing groove 11113 is in a semicircular arc shape, and the second sealing member 1113 forms a protruding structure at two edges perpendicular to the first direction X; the two opposite groove walls of the first sealing groove 11113 match the protruding structure to form a groove structure.

[0105] Specifically, the second sealing member 1113 extends in a columnar shape along the first direction X, and the surface of the second sealing member 1113 forms two surface areas, one area is a plane area, and the plane area is arranged opposite to and parallel to the bottom surface of the first sealing groove 11113, and the other area is a curved area, which is the surface of the second sealing member 1113 on the side facing away from the bottom surface of the first sealing groove 11113, and the curved area is semicircular, and a protruding structure is formed at the edge of the curved area of ​​the second sealing member 1113.

[0106] When the second sealing member 1113 is inserted into the first sealing groove 11113, the raised structure is the portion that matches, contacts and fits with the first sealing groove 11113. Therefore, the two relative groove walls of the first sealing groove 11113 are matched with the raised structure to form a groove structure. It can be seen that the upper groove wall of the groove structure is also semicircular in shape to match the upper surface of the raised structure, so that the groove structure forms a limit on the raised structure along the first direction X.

[0107] In this embodiment, the purpose of limiting the second seal 1113 is achieved by forming a semicircular curved surface on the side surface of the second seal 1113 facing away from the bottom surface of the first seal groove 11113 and matching the groove wall of the first seal groove 11113.

[0108] Reference Fig.14 and Fig.15 As shown, in some embodiments, an end of the second sealing member 1113 close to the second sealing groove 11114 is provided with an outwardly convex or inwardly concave positioning structure 11132 .

[0109] The positioning structure 11132 may be an outwardly convex structure or an inwardly concave structure. For example, the positioning structure 11132 may be a groove structure provided on the surface of the second sealing member 1113 , or the positioning structure 11132 may be an outwardly convex structure provided on the surface of the second sealing member 1113 .

[0110] The positioning structure 11132 is the point of action for external force to act on the second sealing member 1113 to move the second sealing member 1113, which is convenient for the operator to grasp and position the second sealing member 1113. Therefore, it can be understood that the positioning structure 11132 should be located at one end of the second sealing member 1113 close to the second sealing groove 11114, and the positioning structure 11132 can also be exposed in the second sealing groove 11114, so that the external force can directly act on the positioning structure 11132, so that the second sealing member 1113 can smoothly enter and exit the first sealing groove 11113.

[0111] In this embodiment, a positioning structure 11132 is provided on the second sealing member 1113 to facilitate quick installation and removal of the second sealing member 1113 .

[0112] Reference Figure 8-12 As shown, in some embodiments, the first sealing member 1112 includes a column 11121 and a cap body 11122 connected to one end of the column 11121, the column 11121 is inserted into the injection hole 11115 and has an interference fit with the injection hole 11115, and the cap body 11122 abuts against the bottom surface of the first sealing groove 11113; the second sealing member 1113 abuts against the cap body 11122.

[0113] The column 11121 and the cap 11122 are fixedly or detachably connected, for example, the column 11121 and the cap 11122 can be fixed by welding, bonding, or by a fastening assembly, or the column 11121 and the cap 11122 are an integrally formed structure. The column 11121 and the cap 11122 can be connected to form a T shape.

[0114] The column 11121 is inserted into the injection hole 11115 of the housing 1111 and is interference-fitted with the injection hole 11115 to seal the injection hole 11115. The cap body 11122 is exposed outside the injection hole 11115 and abuts against the surface around the opening of the injection hole 11115. The surface around the opening of the injection hole 11115 is the bottom surface of the first sealing groove 11113, that is, the cap body 11122 abuts against the bottom surface of the first sealing groove 11113.

[0115] The second sealing member 1113 is inserted into the first sealing groove 11113 and abuts against the cap body 11122 , so that the column 11121 is limited in the injection hole 11115 , and the cap body 11122 is limited and abuts against the bottom surface of the first sealing groove 11113 .

[0116] In this embodiment, the cap body 11122 can limit the column 11121, making it difficult for the column 11121 to enter the accommodating cavity 11111 through the injection hole 11115. The cap body 11122 can also increase the contact area with the second sealing member 1113 to increase the squeezing force on the second sealing member 1113.

[0117] Reference Figure 8-10 As shown, in some embodiments, a recessed groove 11116 is formed on the bottom surface of the first sealing groove 11113 , and the cap body 11122 matches the recessed groove 11116 and is plugged into and engaged with the recessed groove 11116 .

[0118] The outer diameter of the groove 11116 is larger than the outer diameter of the opening of the injection hole 11115, so that a shoulder structure is formed on the periphery of the injection hole 11115. When the second seal 1113 is connected to the injection hole 11115, the cap body 11122 can be accommodated in the groove 11116, thereby reducing the space occupied by the cap body 11122 in the first accommodating groove, which is beneficial to increase the thickness of the second seal 1113 and enhance the structural strength of the second seal 1113.

[0119] The outer contour of the recessed groove 11116 is matched with the outer contour of the cross section of the cap body 11122 to facilitate positioning and limiting the cap body 11122. The depth of the recessed groove 11116 can be less than or equal to the thickness of the cap body 11122, so that the cap body 11122 can form a portion protruding from the bottom surface of the first sealing groove 11113, so that the second sealing member 1113 can contact the cap body 11122.

[0120] In this embodiment, the groove 11116 is used to position and limit the cap body 11122, thereby improving the reliability of the connection between the second sealing member 1113 and the injection hole 11115.

[0121] Reference Figure 8 and Fig.11 As shown, in some embodiments, the cap body 11122 forms a protruding outer convex portion 11125 outside the notch of the recess 11116 , and the second sealing member 1113 abuts against the outer convex portion 11125 .

[0122] Specifically, the bottom end of the cap body 11122 abuts against the bottom of the groove 11116, and the top end of the cap body 11122 protrudes outside the notch of the groove 11116, so that the top end of the cap body 11122 forms an outer protrusion 11125, which is used to directly abut against the second sealing member 1113.

[0123] Since the top of the cap body 11122 forms an outer protrusion 11125, it can be known that after the second seal 1113 is inserted into the first sealing groove 11113, the second seal 1113 will press the outer protrusion 11125, so that the cap body 11122 squeezes the bottom surface of the groove 11116, thereby enhancing the extrusion force between the cap body 11122 and the bottom surface of the groove, thereby improving the sealing effect.

[0124] In this embodiment, the outer protrusion 11125 protrudes outside the groove 11116, which makes it easier for the second sealing member 1113 to squeeze the cap body 11122, thereby improving the sealing effect.

[0125] In some embodiments, the cap body 11122 is elastic.

[0126] The cap body 11122 can be made of elastic material to make the cap body 11122 elastic. For example, the cap body 11122 can be made of rubber, silicone, polyurethane, polyvinyl chloride, polytetrafluoroethylene, elastic fiber and other materials.

[0127] The cap body 11122 has elastic fingers, and the cap body 11122 can be elastically deformed in a direction perpendicular to the depth of the groove 11116, so that when the second seal 1113 is squeezed against the cap body 11122, the cap body 11122 can be squeezed and elastically deformed, thereby reducing the looseness problem between the second seal 1113 and the cap body 11122 and allowing the second seal 1113 to maintain the squeezing force between the cap body 11122.

[0128] In this embodiment, the elastic cap body 11122 can improve the sealing performance of the liquid injection hole 11115.

[0129] Reference Figure 12-14 As shown, in some embodiments, the end of the column 11121 away from the cap body 11122 has an inserting surface 11123, and the inserting surface 11123 is a spherical surface.

[0130] The end of the column 11121 away from the cap body 11122 is the plug-in end of the column 11121, and the end face of the plug-in end is the plug-in surface 11123, so that the plug-in surface 11123 is a spherical surface, and the spherical surface is a smooth curved surface, so that the plug-in end can pass through the opening of the injection hole 11115 more smoothly, so as to reduce the interference problem between the plug-in end and the opening.

[0131] In this embodiment, the spherical plug-in end is more conducive to inserting the column 11121 into the injection hole 11115, so as to reduce the scratching problem on the hole mouth and hole wall of the injection hole 11115 and reduce the risk of sealing leakage.

[0132] In some embodiments, the column 11121 is an elastic column 11121.

[0133] The column 11121 can be made of elastic material to make the column 11121 elastic. For example, the column 11121 can be made of rubber, silicone, polyurethane, polyvinyl chloride, polytetrafluoroethylene, elastic fiber and other materials.

[0134] The column 11121 is elastic and may include the ability of the column 11121 to elastically deform in the diameter direction, so that after the column 11121 is inserted into the injection hole 11115, the hole wall of the injection hole 11115 can squeeze the outer cylindrical surface of the column 11121 to enhance the sealing between the column 11121 and the hole wall of the injection hole 11115.

[0135] The column 11121 is elastic and can also be elastically deformed in the length direction, so that when the second seal 1113 squeezes the cap body 11122, the column 11121 can be squeezed and elastically deformed, which is convenient for reducing the looseness problem between the second seal 1113 and the cap body 11122, so that the second seal 1113 maintains the squeezing force between the cap body 11122.

[0136] In this embodiment, the elastic column 11121 can improve the sealing performance of the injection hole 11115 .

[0137] Reference Fig.13 As shown, in some embodiments, the first sealing member 1112 also includes an elastic telescopic portion 11124 connected between the column 11121 and the cap body 11122 .

[0138] The elastic telescopic portion 11124 is arranged between the column 11121 and the cap body 11122. The elastic telescopic portion 11124 can be telescopically deformed along the length direction of the column 11121, so that the cap body 11122 can be elastically deformed when squeezed by the second sealing member 1113. It can be understood that when the squeezing force of the second sealing member 1113 on the cap body 11122 is reduced, the elastic telescopic portion 11124 can stretch and deform, thereby maintaining the contact between the cap body 11122 and the second sealing member 1113.

[0139] The elastic telescopic part 11124 can be an integrally formed structure with the column 11121 and the cap body 11122 to facilitate manufacturing; alternatively, the elastic telescopic part 11124 can be detachably connected to the column 11121 or the cap body 11122, thereby improving the sealing reliability between the first sealing member 1112 and the injection hole 11115.

[0140] In this embodiment, an elastic telescopic portion 11124 is additionally provided to help maintain the squeezing force between the second sealing member 1113 and the cap body 11122 at all times, thereby improving the sealing performance between the first sealing member 1112 and the injection hole 11115 .

[0141] Reference Figure 3-6 As shown, in some embodiments, the outer shell 1111 includes a shell body and a cover body connected to the shell body, the cover body and the shell body together form a accommodating cavity 11111, and the assembly surface 11112, the first sealing groove 11113 and the second sealing groove 11114 are all located on the cover body.

[0142] Specifically, the cover body can be considered as the first part 11117 mentioned above, and the shell body can be considered as the second part 11118 mentioned above. The shell body has a cavity, and the cover body and the shell body are detachably connected. The cover body is connected to the shell body to close the cavity to form a accommodating cavity 11111.

[0143] During the manufacturing process of the battery device 1100, the electrode assembly 1115 needs to be accommodated in the cavity of the shell body, and the liquid is injected after the cover body is installed. The cover body is generally connected to the upper end of the shell body. Therefore, the injection hole 11115 is opened on the cover body, which is convenient for operation from above, so as to inject electrolyte into the accommodating cavity 11111 from above.

[0144] In this embodiment, the injection hole 11115, the assembly surface 11112, the first sealing groove 11113 and the second sealing groove 11114 are all arranged on the cover body. The cover body is generally flat and has a small volume and regular shape compared to the shell body, which is easier to process, thereby reducing the processing difficulty and improving work efficiency.

[0145] Reference Figure 3-17As shown, in a specific embodiment, the battery cell 1110 includes a shell 1111, a first sealing member 1112 and a second sealing member 1113. The shell 1111 has a receiving cavity 11111 inside, and the shell 1111 has an assembly surface 11112. The assembly surface 11112 has a first sealing groove 11113 and a second sealing groove 11114, both of which have a groove depth along a first direction X. In the second direction Y, the first sealing groove 11113 and the second sealing groove 11114 are arranged to be connected, and the first direction X is perpendicular to the second direction Y. The bottom surface of the first sealing groove 11113 has a liquid injection hole 11115 connected to the receiving cavity 11111; the first sealing member 1112 is inserted into the liquid injection hole 11115. 115 and seals the injection hole 11115; the second sealing member 1113 is inserted into the first sealing groove 11113 along the second direction Y by the second sealing groove 11114, the second sealing member 1113 is positioned in the first sealing groove 11113 at the upper limit in the first direction X, and the second sealing member 1113 abuts against the first sealing member 1112; the first limiting structure 11120 is connected to the groove wall of the first sealing groove 11113, and the second limiting structure 11131 is connected to the second sealing member 1113, and the first limiting structure 11120 and the second limiting structure 11131 are plugged and matched along the second direction Y; any one of the first limiting structure 11120 and the second limiting structure 11131 is a groove The second sealing member 1113 is a cylindrical structure extending along the first direction X, and the other is a protruding structure. The groove wall of the groove structure along the second direction Y is through-set to form an insertion interface, and the protruding structure is plugged and matched with the groove structure by the insertion interface; the groove structure is a dovetail groove, and the shape of the protruding structure matches the dovetail groove and is plugged and matched with the dovetail groove; the second sealing member 1113 extends along the first direction X in a columnar shape, and the surface of the second sealing member 1113 on the side facing away from the bottom surface of the first sealing groove 11113 is semicircular; the two opposite groove walls of the first sealing groove 11113 match the edges of the semicircular surface of the second sealing member 1113 to limit the second sealing member 1113; the first sealing member 1112 includes a column 11121 and a body connected to the column 11121 The cap body 11122 at the end, the column 11121 is inserted into the injection hole 11115 and has an interference fit with the injection hole 11115, the cap body 11122 abuts against the bottom surface of the first sealing groove 11113; the second sealing member 1113 abuts against the cap body 11122; a sink groove 11116 is formed on the bottom surface of the first sealing groove 11113, the cap body 11122 matches the sink groove 11116 and is plugged and matched with the sink groove 11116; the cap body 11122 forms a protruding outer convex portion 11125 outside the notch of the sink groove 11116, and the second sealing member 1113 abuts against the outer convex portion 11125; the cap body 11122 is elastic; the column 11121 is an elastic column 11121;The housing 1111 includes a housing body and a cover body connected to the housing body. The cover body and the housing body together enclose a receiving cavity 11111. The assembly surface 11112, the first sealing groove 11113 and the second sealing groove 11114 are all located on the cover body. ;

[0146] According to some embodiments of the present application, referring to Figure 2 As shown, the present application further provides a battery device 1100 , and the battery device 1100 includes the battery cell 1110 in the above embodiment.

[0147] Specifically, refer to Figure 2 As shown, the embodiment of the present application provides a battery device 1100 (Battery Apparatus), which may include one or more battery cell assemblies for providing voltage and capacity, and the battery cell assembly (Battery Cell Assembly) may include multiple battery cells 1110, and the multiple battery cells 1110 are connected in series, parallel or mixed through a busbar component. The battery device 1100 can also be a battery pack (battery pack), which generally includes a box 1120 and one or more battery cells 1110, and the battery cells 1110 are accommodated in the box 1120.

[0148] The battery device 1100 disclosed in the embodiment of the present application can be used in an electrical device that uses the battery device 1100 as a power source or various energy storage devices and energy storage systems that use the battery device 1100 as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a portable device, a laptop computer, an electric toy, an electric tool, a battery car, a vehicle 1000, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0149] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0150] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 1100 is provided inside the vehicle 1000, and the battery device 1100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 1100 may be used to power the vehicle 1000, for example, the battery device 1100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300, and the controller 1200 is used to control the battery device 1100 to power the motor 1300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0151] In some embodiments of the present application, the battery device 1100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0152] Please refer to Figure 2 As shown, Figure 2 A schematic diagram of the exploded structure of a battery device 1100 provided for some embodiments of the present application. In one embodiment, the battery device 1100 includes a housing 1120 and a battery cell assembly. A housing space 1123 is formed in the housing 1120. The battery cell 1110 is accommodated in the housing space 1123. The battery cell assembly is often formed by arranging a plurality of battery cells 1110. Alternatively, the battery cell assembly can also be a battery module, which is formed by arranging and fixing a plurality of battery cells 1110 to form an independent module. Among them, the housing 1120 is used to provide an accommodating space 1123 for the battery cell 1110, and the housing 1120 can adopt a variety of structures.

[0153] As for the box body 1120, the box body 1120 is used to accommodate the battery cell assembly, and the box body 1120 may include a first structure part 1121 and a second structure part 1122, the first structure part 1121 and the second structure part 1122 cover each other, and the first structure part 1121 and the second structure part 1122 jointly define an accommodation space 1123 for accommodating the battery cell 1110. Among them, the first structure part 1121 may be a plate-shaped structure, and the second structure part 1122 may be a hollow structure with one end open, and the first structure part 1121 covers the open side of the second structure part 1122 to jointly define the accommodation space 1123 with the second structure part 1122. Optionally, the first structure part 1121 may also be a hollow structure with one side open, and the second structure part 1122 may also be a hollow structure with one end open, and the open side of the first structure part 1121 covers the open side of the second structure part 1122 to define the accommodation space 1123 together with the second structure part 1122. The box body 1120 may be in various shapes, such as a cylinder, a cuboid, etc.

[0154] According to some embodiments of the present application, the present application further provides an energy storage device, which includes a plurality of battery cells 1110 and a battery device 1100 , and the battery cells 1110 and the battery device 1100 are used to store or provide electrical energy.

[0155] Specifically, the energy storage device may include one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery cells 1110 and battery devices 1100. The multiple battery cells 1110 and the multiple battery devices 1100 are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0156] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0157] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0158] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters, wherein the battery clusters are housed in the cabinet.

[0159] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0160] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the battery cells 1110 to each battery device 1100 through a pipeline.

[0161] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The main control module includes a slave battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch and other modules.

[0162] As an example, the master control module can be used as a battery management unit of an energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device. For example, the charging and discharging current, voltage, etc. of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module.

[0163] As an example, the fire protection module includes a control panel, a detector, an alarm device, etc., which are used to detect, alarm or extinguish fire in the energy storage system.

[0164] As an example, the power distribution module can be used to distribute power to modules in the energy storage device that require power.

[0165] According to some embodiments of the present application, the present application also provides an energy storage system, which includes a power conversion device and the energy storage device in the above embodiments, and the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0166] In some embodiments, the energy storage system may include one or more energy storage devices and a power converter system (PCS), and the power converter is used to connect between the power generation equipment and the energy storage device. The power generation equipment is used to generate electrical energy, and the electrical energy generated by the power generation equipment can be stored in the energy storage device through the power conversion device. As an example, the power generation equipment may specifically be a solar panel, a hydropower generation equipment, a thermal power generation equipment, a wind power generation equipment, etc. Among them, the specific type of the power generation equipment is not limited in this application.

[0167] According to some embodiments of the present application, referring to Figure 1 As shown, the present application further provides an electrical device, which includes the battery device 1100 in the above embodiment, the energy storage device in the above embodiment, or the energy storage system in the above embodiment, and the battery device 1100 is used to store or provide electrical energy.

[0168] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells 1110, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0169] The example of the electrical device in the present application is based on the example of the battery device 1100 described above. The example of the electrical device includes all the technical effects of the example of the battery device 1100 described above, which will not be described in detail.

[0170] According to some embodiments of the present application, the present application further provides a charging network, which includes charging piles and the energy storage device in the above embodiment or the energy storage system in the above embodiment, and the energy storage device is used to provide electrical energy for the charging piles.

[0171] For example, the charging network includes a charging pile and an energy storage device, the charging pile is electrically connected to the energy storage device, and the energy storage device is used to provide electrical energy to the charging pile. The charging pile is electrically connected to the battery device 1100 in the energy storage device through a cable, and the battery device 1100 can provide its stored electrical energy to the charging pile. The charging pile has one or more connectors, which are used to connect to an electrical device (such as a vehicle 1000) so that energy can be replenished to the electrical device.

[0172] The energy storage device can be located inside the charging pile (such as an integrated storage and charging machine) or outside the charging pile.

[0173] The above are only preferred embodiments of the present application, and only specifically describe the technical principles of the present application. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, and other specific implementation methods of the present application that can be associated with the technicians in this field without creative work, should be included in the scope of protection of the present application.

Claims

1. A battery cell (1110), characterized in that: include: A shell (1111) having an accommodating cavity (11111) therein; the shell (1111) having an assembly surface (11112); the assembly surface (11112) having a first sealing groove (11113) and a second sealing groove (11114) having a groove depth along a first direction (X); in a second direction (Y), the first sealing groove (11113) and the second sealing groove (11114) are arranged to intersect with each other; the first direction (X) is perpendicular to the second direction (Y); and the bottom surface of the first sealing groove (11113) has a liquid injection hole (11115) communicating with the accommodating cavity (11111); A first sealing member (1112) is inserted into the liquid injection hole (11115) and seals the liquid injection hole (11115); The second sealing member (1113) is inserted into the first sealing groove (11113) along the second direction (Y) via the second sealing groove (11114); in the first direction (X), the second sealing member (1113) is limited in the first sealing groove (11113); the second sealing member (1113) abuts against and limits the first sealing member (1112).

2. The battery cell (1110) according to claim 1, characterized in that: The battery cell (1110) further comprises a fixing structure (1114), wherein the fixing structure (1114) is connected between the second sealing member (1113) and the housing (1111).

3. The battery cell (1110) according to claim 1, characterized in that: The second sealing member (1113) is fixed to the housing (1111) by welding.

4. The battery cell (1110) according to any one of claims 1 to 3, characterized in that: A first limiting structure (11120) is connected to the groove wall of the first sealing groove (11113), and a second limiting structure (11131) is connected to the second sealing member (1113). Along the second direction (Y), the first limiting structure (11120) and the second limiting structure (11131) are plugged into each other.

5. The battery cell (1110) according to claim 4, characterized in that: Any one of the first limiting structure (11120) and the second limiting structure (11131) is a groove structure, and the other is a protrusion structure, the notch of the groove structure is extended along the second direction (Y), and along the second direction (Y), the protrusion structure is plugged into and matched with the groove structure.

6. The battery cell (1110) according to claim 5, characterized in that: The groove structure is a dovetail groove, and the shape of the protrusion structure matches the dovetail groove and is plugged and matched with the dovetail groove.

7. The battery cell (1110) according to claim 5, characterized in that: The second sealing member (1113) extends in a columnar shape along a first direction (X); a surface of the second sealing member (1113) on a side of the bottom surface of the first sealing groove (11113) that is away from the bottom surface of the first sealing groove (11113) is in a semicircular arc shape; the second sealing member (1113) forms the protruding structures at two edges perpendicular to the first direction (X); and two opposite groove walls of the first sealing groove (11113) match the protruding structures to form the groove structure.

8. The battery cell (1110) according to any one of claims 1 to 3, characterized in that: An end of the second sealing member (1113) close to the second sealing groove (11114) is provided with an outwardly convex or inwardly concave positioning structure (11132).

9. The battery cell (1110) according to any one of claims 1 to 3, characterized in that: The first sealing member (1112) comprises a column (11121) and a cap body (11122) connected to one end of the column (11121); the column (11121) is inserted into the liquid injection hole (11115) and has an interference fit with the liquid injection hole (11115); the cap body (11122) abuts against the bottom surface of the first sealing groove (11113); and the second sealing member (1113) abuts against the cap body (11122).

10. The battery cell (1110) according to claim 9, characterized in that: A recessed groove (11116) is formed on the bottom surface of the first sealing groove (11113), and the cap body (11122) matches the recessed groove (11116) and is plug-fitted with the recessed groove (11116).

11. The battery cell (1110) according to claim 10, characterized in that: The cap body (11122) forms a protruding outer convex portion (11125) outside the notch of the sink groove (11116), and the second sealing member (1113) abuts against the outer convex portion (11125).

12. The battery cell (1110) according to claim 11, characterized in that: The cap body (11122) is elastic.

13. The battery cell (1110) according to claim 9, characterized in that: An end of the column (11121) away from the cap body (11122) has an inserting surface (11123), and the inserting surface (11123) is a spherical surface.

14. The battery cell (1110) according to claim 9, characterized in that: The column (11121) is an elastic column (11121).

15. The battery cell (1110) according to any one of claims 1 to 3, characterized in that: The outer shell (1111) comprises a shell body and a cover body connected to the shell body, the cover body and the shell body together enclose the accommodating cavity (11111), and the assembly surface (11112), the first sealing groove (11113) and the second sealing groove (11114) are all located on the cover body.

16. A battery device (1100), characterized in that: The battery device (1100) comprises the battery cell (1110) according to any one of claims 1 to 15.

17. An energy storage device, characterized in that: The battery device comprises a plurality of battery cells (1110) according to any one of claims 1 to 15 or a battery device (1100) according to claim 16, wherein the battery cells (1110) and the battery device (1100) are used to store or provide electrical energy.

18. An electrical device, characterized in that: It comprises the battery cell (1110) according to any one of claims 1 to 15, the battery device (1100) according to claim 16, or the energy storage device according to claim 17, wherein the battery device (1100) is used to store or provide electrical energy.

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