Lower plastic structure, end cover assembly, energy storage device and electric equipment

Abstract

The utility model relates to a lower plastic structure, an end cover assembly, an energy storage device and electric equipment. A body is provided with a liquid injection port; the liquid injection barrel is arranged on the body and provided with a drainage channel, a first opening and a second opening are formed in the two ends of the drainage channel respectively, the first opening communicates with the liquid injection opening, and a communication opening is formed in the side wall of the liquid injection barrel and communicates with the drainage channel; the stop piece is movably arranged in the drainage channel and is used for opening or shielding the first opening; the cover body is movably arranged on the liquid injection barrel and located in the drainage channel, and the cover body is used for abutting against the stopping piece.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and in particular to a lower plastic structure, an end cover assembly, an energy storage device and electrical equipment. Background Art

[0002] Before the battery leaves the factory, the inside of the battery shell needs to be evacuated to facilitate the smooth injection of electrolyte into the battery shell. After the injection is completed, the battery is powered on for the first time, so that the electrolyte in the battery shell reacts with the active materials in the battery cell. The reaction process will cause some electrolyte loss, so the battery needs to be injected with electrolyte for the second time to replenish the lost electrolyte. During the secondary injection process, the battery shell still needs to be evacuated to perform the injection. During this process, the electrolyte that has not been completely infiltrated with the active materials in the battery cell will be extracted, resulting in insufficient actual injection of electrolyte, affecting the battery capacity. Summary of the invention

[0003] Based on this, it is necessary to provide a lower plastic structure, an end cover assembly, an energy storage device and an electrical equipment to address the problem of insufficient electrolyte injection in traditional technologies that affects battery capacity.

[0004] The technical solution is as follows:

[0005] One embodiment provides a lower plastic structure, comprising:

[0006] A main body, wherein the main body is provided with a liquid injection port;

[0007] A liquid injection cylinder, the liquid injection cylinder is arranged on the main body and has a drainage channel, the two ends of the drainage channel are respectively provided with a first opening and a second opening, the first opening is communicated with the liquid injection port, and a communication port is opened on the side wall of the liquid injection cylinder, and the communication port is communicated with the drainage channel;

[0008] a stopper, the stopper being movably disposed on the drainage channel and used for opening or covering the first opening; and

[0009] A cover body is movably disposed on the liquid injection cylinder and located in the drainage channel, and the cover body is used to abut against the stopper.

[0010] The direction in which the second opening is toward the first opening is set as the first direction, the cover body moves toward the first direction so that the stopper moves toward the first direction and covers the first opening, and the cover body moves away from the first direction so that the stopper moves away from the first direction and opens the first opening.

[0011] In the above-mentioned lower plastic structure, the direction in which the second opening faces the first opening is the first direction, and the opposite direction of the first direction is the second direction. When it is necessary to inject electrolyte into the battery shell, the staff injects electrolyte into the injection port of the main body. At this time, the electrolyte has a tendency to enter the drainage channel through the first opening and flow along the second direction. The stopper and the cover body located in the drainage channel also move along the second direction under the thrust generated by the flow of the electrolyte, so that the stopper opens the first opening, so that the electrolyte in the drainage channel can smoothly enter the battery shell through the connecting port on the side wall of the injection cylinder; when the battery shell is evacuated, the electrolyte inside the battery shell that is not in contact with the electrolyte will flow into the battery shell. The electrolyte that is completely soaked in the active material in the battery cell has a tendency to flow from the second opening into the drainage channel and flow along the first direction. At this time, the cover body also moves along the first direction under the action of the thrust generated by the flow of the electrolyte, and the stopper also moves toward the first direction and covers the first opening under the resistance of the cover body, thereby preventing the electrolyte from flowing out of the injection port. Compared with the conventional technology, the above-mentioned lower plastic structure can avoid the electrolyte in the battery shell that is not completely soaked in the active material in the battery cell from flowing out of the injection port when the inside of the battery shell is evacuated without affecting the injection of electrolyte into the battery shell, thereby ensuring the injection amount of electrolyte inside the battery shell and the service life of the battery.

[0012] In one embodiment, the lower plastic structure further includes a mounting member, which is arranged at the second opening, and the cover body has a first side and a second side opposite to each other, the first side is rotatably arranged at the mounting member, and the second side is used to abut against the stopper. The mounting member is arranged at the second opening of the liquid injection cylinder, and the first side of the cover body is rotatably arranged at the mounting member, so that the second side of the cover body can move and abut against the stopper. When the inside of the battery shell is evacuated, the electrolyte inside the battery shell that is not completely infiltrated with the active material in the battery core has a tendency to flow from the second opening to the first opening to enter the drainage channel and flow along the first direction. At this time, the second side of the cover body also moves along the first direction and abuts against the stopper under the thrust generated by the flow of the electrolyte. The stopper moves along the first direction and shields the first opening under the abutment of the cover body, preventing the electrolyte from flowing from the first opening to the liquid injection port and flowing out; in addition, setting the cover body at the second opening can not only prevent the cover body from obstructing the flow of the electrolyte through the connecting port when it moves, but also facilitates processing and molding, thereby reducing manufacturing costs.

[0013] In one embodiment, the mounting member includes a connecting portion and a mounting shaft, the connecting portion is arranged along the circumference of the second opening, the mounting shaft is rotatably arranged on the connecting portion, and the first side is arranged on the mounting shaft. The first side of the cover body is connected to the connecting portion through a rotatable mounting shaft, so that when the staff injects electrolyte into the injection port of the body, the electrolyte has a tendency to enter the drainage channel through the first opening and flow along the second direction. At this time, the stopper and the cover body are subjected to the thrust generated by the flow of the electrolyte, the stopper opens the first opening, and the first side of the cover body rotates under the action of the mounting shaft and drives the second side to move along the second direction; when the inside of the battery shell is evacuated, the electrolyte inside the battery shell that is not completely infiltrated with the active material in the battery cell has a tendency to flow along the second direction. There is a tendency for the electrolyte to flow into the drainage channel from the second opening and flow along the first direction. At this time, the stopper and the cover body are subjected to the thrust generated by the flow of the electrolyte. The first side of the cover body rotates under the action of the mounting shaft and drives the second side to move along the first direction. The second side of the cover body abuts against the stopper. The stopper moves along the first direction and covers the first opening under the abutment of the second side of the cover body, preventing the electrolyte from flowing from the first opening to the liquid injection port and out. The connection and rotation of the cover body and the liquid injection cylinder are realized by the mounting shaft arranged on the connecting part, which has low cost and reliable effect.

[0014] In one embodiment, at least two mounting shafts are provided and arranged at intervals along the circumference of the connecting portion, and at least two covers are provided and arranged one-to-one with the mounting shafts. At least two mounting shafts are arranged at intervals along the circumference of the connecting portion, and at least two covers are arranged one-to-one with at least two mounting shafts to achieve shielding of the second opening. When the inside of the battery housing is evacuated, the second sides of all the covers move along the first direction under the thrust of the electrolyte and contact the stopper to cover the first opening. The at least two covers can not only achieve more effective contact with the stopper, but also make the opening and closing of the second opening smoother; in addition, when one of the covers is damaged, the other covers can temporarily replace the damaged cover to reduce downtime.

[0015] In one embodiment, at least two communication ports are provided and are arranged at intervals along the circumference of the injection cylinder. With such an arrangement, when electrolyte is injected into the battery housing, the electrolyte can simultaneously enter the battery housing through at least two communication ports, increasing the flow rate of the electrolyte when entering the battery housing and improving the injection efficiency; in addition, by providing at least two communication ports, the gas inside the battery housing can also flow more smoothly through the communication ports to the injection port and be discharged, thereby improving the safety of the battery.

[0016] In one embodiment, the direction from which the second opening faces the first opening is set as the first direction, and the communication port is extended along the first direction. Such a setting can increase the opening area of ​​the communication port, which not only allows the electrolyte to enter the battery case more smoothly when the electrolyte is injected into the battery case, increases the flow rate of the electrolyte, and improves the injection efficiency, but also allows the gas inside the battery case to flow more smoothly through the communication port to the injection port and be discharged, thereby improving the safety of the battery.

[0017] In one embodiment, the stopper includes a stopper ball, and the stopper ball is provided with an air guide channel. The stopper ball can have a higher fit with the first opening to prevent the electrolyte inside the battery housing from passing through the first opening and flowing out of the liquid injection port. By providing the air guide channel on the stopper ball, when the stopper ball covers the first opening, the gas generated by the battery during daily use can still be discharged to the outside of the liquid injection port through the air guide channel, thereby improving the safety of the battery.

[0018] In one embodiment, the gas guide channel includes at least two first annular grooves and at least two second annular grooves, all of the first annular grooves are arranged at intervals along the first axis direction of the stop ball, and all of the second annular grooves are arranged at intervals along the second axis direction of the stop ball, and the first axis direction and the second axis direction form an angle so that each of the first annular grooves intersects with each of the second annular grooves. By setting at least two first annular grooves to intersect with at least two second annular grooves, when the stop ball fits with the first opening at different angles, the gas generated inside the battery housing can be discharged through the first annular groove or the second annular groove, further improving the reliability of the lower plastic structure and the safety of the battery housing.

[0019] Another embodiment provides an end cover assembly, which includes a top cover plate and a lower plastic structure as described in any of the above embodiments, wherein the top cover plate and the lower plastic structure are stacked.

[0020] Yet another embodiment provides an energy storage device, comprising a shell, a battery cell and the end cap assembly described in the above embodiment, wherein the shell has a connected opening and a receiving cavity, the battery cell is placed in the receiving cavity, and the end cap assembly is sealed to the opening.

[0021] Still another embodiment provides an electric device, the electric device comprising the energy storage device described in the above embodiment, the energy storage device being used to supply power to the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments 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 creative work.

[0023] FIG. 1 is a schematic structural diagram of an end cover assembly in one embodiment of the present application.

[0024] FIG. 2 is a schematic structural diagram of the end cover assembly in FIG. 1 from another angle.

[0025] FIG. 3 is a partial enlarged view of portion B in FIG. 2 .

[0026] FIG. 4 is a schematic diagram of the AA section when the stopper and the cover body move along the second direction in one embodiment of the present application.

[0027] FIG. 5 is a schematic diagram of the AA section when the stopper and the cover body move along the first direction in one embodiment of the present application.

[0028] FIG. 6 is a schematic diagram of the structure of a stop ball in an embodiment of the present application.

[0029] FIG. 7 is a schematic diagram of the AA section in another embodiment of the present application.

[0030] FIG8 is a schematic diagram of the AA section in another embodiment of the present application.

[0031] Notes on the attached drawings:

[0032] 10. End cover assembly; 11. Lower plastic structure; 12. Top cover plate; 13. Liquid injection hole; 100. Main body; 110. Liquid injection port; 200. Liquid injection cylinder; 210. First opening; 220. Second opening; 230. Drainage channel; 240. Connecting port; 300. Current limiting assembly; 310. Cover body; 311. First side; 312. Second side; 320. Stop member; 321. Stop ball; 3211. First annular groove; 3212. Second annular groove; 330. Mounting member; 331. Connecting portion; 400. Sealing plug. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if the 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. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0039] Please refer to Figures 1 to 5. An embodiment of the present application provides a lower plastic structure, including a main body 100, a liquid injection cylinder 200, a stopper 320 and a cover body 310. The main body 100 is provided with a liquid injection port 110; the liquid injection cylinder 200 is arranged on the main body 100 and has a drainage channel 230, and the two ends of the drainage channel 230 are respectively provided with a first opening 210 and a second opening 220, the first opening 210 is connected with the liquid injection port 110, and the side wall of the liquid injection cylinder 200 is provided with a connecting port 240, which is connected with the drainage channel 230; the stopper 320 is movably arranged on the drainage channel 230 and is used to open or cover the first opening 210; the cover body 310 is movably arranged on the liquid injection cylinder 200 and is located in the drainage channel 230, and the cover body 310 is used to resist the stopper 320.

[0040] In the above-mentioned lower plastic structure, the direction of the second opening 220 toward the first opening 210 is set as the first direction (i.e., direction C in FIG. 4 ), and the opposite direction of the first direction is the second direction (i.e., direction D in FIG. 4 ). When it is necessary to inject electrolyte into the battery shell, the staff injects electrolyte into the injection port 110 of the main body 100. At this time, the electrolyte has a tendency to enter the drainage channel 230 through the first opening 210 and flow along the second direction. The stopper 320 and the cover body 310 located in the drainage channel 230 also move along the second direction under the action of the thrust generated by the flow of the electrolyte, so that the stopper 320 opens the first opening 210, so that the electrolyte in the drainage channel 230 can smoothly enter the battery shell through the connecting port 240 on the side wall of the injection cylinder 200; when the electrolyte is injected into the battery shell, the staff injects electrolyte into the injection port 110 of the main body 100. At this time, the electrolyte has a tendency to enter the drainage channel 230 through the first opening 210 and flow along the second direction. The stopper 320 and the cover body 310 located in the drainage channel 230 also move along the second direction under the action of the thrust generated by the flow of the electrolyte, so that the stopper 320 opens the first opening 210, so that the electrolyte in the drainage channel 230 can smoothly enter the battery shell through the connecting port 240 on the side wall of the injection cylinder 200; When the battery shell is evacuated, the electrolyte inside the battery shell that has not been completely infiltrated with the active materials in the battery cell has a tendency to flow from the second opening 220 into the drainage channel 230 and flow along the first direction. At this time, the cover body 310 also moves along the first direction under the action of the thrust generated by the flow of the electrolyte, and the stopper 320 also moves toward the first direction and covers the first opening 210 under the resistance of the cover body 310, thereby preventing the electrolyte from flowing out of the injection port 110. Compared with the conventional technology, the lower plastic structure can avoid the electrolyte in the battery shell that has not been completely infiltrated with the active materials in the battery cell from flowing out of the injection port 110 when the battery shell is evacuated without affecting the process of injecting the electrolyte into the battery shell, thereby ensuring the injection amount of the electrolyte inside the battery shell and the service life of the battery.

[0041] As an explanation, please refer to FIG. 2 . When the electrolyte flows in the second direction, the electrolyte will exert a thrust in the second direction on the stopper 320 and the cover 310 in the liquid injection cylinder 200, so that the stopper 320 and the cover 310 have a tendency to move in the second direction. At this time, the stopper 320 moves in the second direction and opens the first opening 210, so that the electrolyte in the drainage channel 230 can smoothly enter the interior of the battery housing through the connecting port 240 on the side wall of the liquid injection cylinder 200; please refer to FIG. 3. When the electrolyte flows along the first direction, the electrolyte will apply a thrust in the first direction to the stopper 320 and the cover 310 in the liquid injection cylinder 200, so that the stopper 320 and the cover 310 have a tendency to move along the first direction. At this time, the cover 310 also moves along the first direction under the thrust generated by the flow of the electrolyte. The stopper 320 also moves toward the first direction and covers the first opening 210 under the resistance of the cover 310, thereby preventing the electrolyte from flowing out of the liquid injection port 110.

[0042] Furthermore, the shape of the stopper 320 matches the shape of the first opening 210; for example, when the shape of the first opening 210 is circular, the shape of the stopper 320 is spherical, and when the shape of the first opening 210 is rectangular, the shape of the stopper 320 is a prism.

[0043] Furthermore, in a feasible embodiment, the cover body 310 is located in the drainage channel 230 and has no connection with the injection cylinder 200. In this way, when the electrolyte enters the drainage channel 230 through the first opening 210 and moves along the second direction, the cover body 310 also moves along the second direction with the flow of the electrolyte under the thrust of the electrolyte to cover the second opening 220. When the inside of the battery shell is evacuated, the electrolyte inside the battery shell that is not completely infiltrated with the active material in the battery cell has a tendency to flow from the second opening 220 into the drainage channel 230 and flow along the first direction, thereby driving the cover body 310 to move toward the first direction in the drainage channel 230, so that the stopper 320 covers the first opening 210 under the resistance of the cover body 310 to prevent the electrolyte from flowing out of the injection port 110.

[0044] In another feasible embodiment, the cover body 310 may also be movably connected to the liquid injection cylinder 200. Since the cover body 310 and the liquid injection cylinder 200 are connected, compared with the case where the cover body 310 and the liquid injection cylinder 200 in the above embodiment have no connection relationship, the cover body 310 in this embodiment has a more stable movement trajectory, thereby making the cover body 310 have a more stable resistance effect on the stopper 320.

[0045] Optionally, the cover body 310 may be disposed on the outer periphery of the second opening 220 , or may be disposed inside the drainage channel 230 , which is not specifically limited herein.

[0046] Please refer to Figures 4 and 5. In one embodiment, the lower plastic structure further includes a mounting member 330. The mounting member 330 is disposed at the second opening 220. The cover 310 has a first side 311 and a second side 312 opposite to each other. The first side 311 is rotatably disposed on the mounting member 330, and the second side 312 is used to abut the stopper 320. The mounting member 330 is disposed at the second opening 220 of the injection cylinder 200. The first side 311 of the cover 310 is rotatably disposed on the mounting member 330 so that the second side 312 of the cover 310 can move and abut the stopper 320. When the interior of the battery housing is evacuated, the electrolyte inside the battery housing that is not completely infiltrated with the active material in the battery core has a tendency to flow from the second opening 220 to the first opening 210, enter the drainage channel 230, and flow along the first direction. At this time, the cover 3 The second side 312 of 10 also moves along the first direction under the thrust generated by the flow of electrolyte and abuts against the stopper 320. The stopper 320 moves along the first direction under the abutment of the cover body 310 and covers the first opening 210, preventing the electrolyte from flowing from the first opening 210 to the injection port 110 and outflowing. In addition, setting the cover body 310 at the second opening 220 can not only prevent the cover body 310 from obstructing the flow of electrolyte through the connecting port 240 when moving, but also facilitate processing and molding, thereby reducing manufacturing costs.

[0047] Please refer to FIG. 4 and FIG. 5. In one embodiment, the mounting member 330 includes a connecting portion 331 and a mounting shaft (not shown in the figure). The connecting portion 331 is arranged along the circumference of the second opening 220. The mounting shaft is rotatably arranged on the connecting portion 331, and the first side 311 is arranged on the mounting shaft. The first side 311 of the cover 310 is connected to the connecting portion 331 through the rotatable mounting shaft. In this way, when the staff injects electrolyte into the injection port 110 of the body 100, the electrolyte has a tendency to enter the drainage channel 230 through the first opening 210 and flow along the second direction. At this time, the stopper 320 and the cover 310 are subjected to the thrust generated by the flow of the electrolyte. The stopper 320 opens the first opening 210. The first side 311 of the cover 310 rotates under the action of the mounting shaft and drives the second side 312 to move along the second direction. When the inside of the battery shell is evacuated, the electrolyte inside the battery shell that is not completely infiltrated with the active material in the battery cell has a tendency to flow out from the second opening 220. The flow enters the drainage channel 230 and tends to flow along the first direction. At this time, the stopper 320 and the cover body 310 are subjected to the thrust generated by the flow of the electrolyte. The first side 311 of the cover body 310 rotates under the action of the mounting shaft and drives the second side 312 to move along the first direction, so that the second side 312 of the cover body 310 contacts the stopper 320. The stopper 320 moves along the first direction and covers the first opening 210 under the contact of the second side 312 of the cover body 310, preventing the electrolyte from flowing from the first opening 210 to the injection port 110 and out. The connection and rotation of the cover body 310 and the injection cylinder 200 are realized by the mounting shaft arranged on the connecting portion 331, which has low cost and reliable effect.

[0048] Specifically, a mounting hole (not shown in the figure) for assembling the mounting shaft is provided on the connecting portion 331, and at least one end of the mounting shaft is rotatably provided in the mounting hole. The first side 311 of the cover body 310 is connected to the side wall of the mounting shaft. In this way, when the mounting shaft rotates along its own circumference with the cooperation of the mounting hole, the first side 311 of the cover body 310 can rotate, thereby driving the second side 312 of the cover body 310 to move.

[0049] Please refer to FIG. 4 and FIG. 5. In one embodiment, at least two mounting shafts are provided and arranged at intervals along the circumference of the connecting portion 331, and at least two covers 310 are provided and arranged one-to-one with the mounting shafts. At least two mounting shafts are arranged at intervals along the circumference of the connecting portion 331, and at least two covers 310 are arranged one-to-one with the at least two mounting shafts to achieve shielding of the second opening 220. When the inside of the battery housing is evacuated, the second sides 312 of all the covers 310 move along the first direction under the thrust of the electrolyte and contact the stopper 320 to cover the first opening 210. The at least two covers 310 can not only achieve more effective contact with the stopper 320, but also make the opening and closing of the second opening 220 smoother. In addition, when one of the covers 310 is damaged, the other covers 310 can temporarily replace the damaged cover 310 to reduce downtime.

[0050] Specifically, referring to FIG. 4 and FIG. 5 , two installation shafts and two cover bodies 310 are provided and are arranged one-to-one. The second sides 312 of the two cover bodies 310 can be butted together to shield the second opening 220 .

[0051] Please refer to Figures 3 to 5. In one embodiment, at least two communication ports 240 are provided and arranged at intervals along the circumference of the injection cylinder 200. In this way, when the electrolyte is injected into the battery housing, the electrolyte can enter the battery housing through at least two communication ports 240 at the same time, increasing the flow rate of the electrolyte when entering the battery housing and improving the injection efficiency; in addition, by providing at least two communication ports 240, the gas inside the battery housing can also flow to the injection port 110 more smoothly through the communication ports 240 and be discharged, thereby improving the safety of the battery.

[0052] Furthermore, by providing at least two communication ports 240 spaced apart along the circumferential direction of the liquid injection cylinder 200 , the flow rate of the electrolyte when injected can be increased, thereby improving the liquid injection efficiency.

[0053] Please refer to Figures 3 to 5. In one embodiment, the direction from the second opening 220 to the first opening 210 is set as the first direction, and the connecting port 240 is extended along the first direction. Such a setting can increase the opening area of ​​the connecting port 240, which can not only make the electrolyte enter the battery shell more smoothly when the electrolyte is injected into the battery shell, increase the flow rate of the electrolyte, and improve the injection efficiency, but also make the gas inside the battery shell flow more smoothly through the connecting port 240 to the injection port 110 and be discharged, thereby improving the safety of the battery.

[0054] In addition, the connecting opening 240 extending along the first direction is more convenient and has lower cost during processing and molding.

[0055] Please refer to Figures 4 to 6. In one embodiment, the stopper 320 includes a stopper sphere 321, and the stopper sphere 321 is provided with an air guide channel. The stopper sphere 321 can have a higher fit with the first opening 210 to prevent the electrolyte inside the battery housing from passing through the first opening 210 and flowing out of the liquid injection port 110. By providing an air guide channel on the stopper sphere 321, when the stopper sphere 321 covers the first opening 210, the gas generated by the battery during daily use can still be discharged to the outside of the liquid injection port 110 through the air guide channel, thereby improving the safety of the battery.

[0056] Optionally, the air guide channel may be configured as an air guide through hole penetrating the stop sphere 321 , or may be an air guide groove disposed on the surface of the stop sphere 321 , which is not specifically limited here.

[0057] Please refer to FIG. 6 . In one embodiment, the air guide channel includes at least two first annular grooves 3211 and at least two second annular grooves 3212. All the first annular grooves 3211 are arranged at intervals along the first axis direction of the stop ball 321. All the second annular grooves 3212 are arranged at intervals along the second axis direction of the stop ball 321. The first axis direction and the second axis direction form an angle so that each first annular groove 3211 intersects with each second annular groove 3212. By arranging at least two first annular grooves 3211 to intersect with at least two second annular grooves 3212, when the stop ball 321 fits the first opening 210 at different angles, the gas generated inside the battery housing can be discharged through the first annular groove 3211 or the second annular groove 3212, further improving the reliability of the lower plastic structure and the safety of the battery.

[0058] For explanation, the first axis and the second axis refer to two intersecting axes on the stop ball 321, all the first annular grooves 3211 are arranged at intervals along the direction of the first axis, and all the second annular grooves 3212 are arranged at intervals along the direction of the second axis, so that the first annular grooves 3211 and the second annular grooves 3212 intersect with each other, thereby facilitating the discharge of gas from the first annular groove 3211 or the second annular groove 3212.

[0059] In other embodiments of the present application, the stopper 320 may not be provided. Specifically, please refer to Figures 7 to 8. The cover body 310 can be movably provided at the second opening 220. When the staff injects electrolyte into the injection port 110 of the main body 100, the electrolyte enters the drainage channel 230 through the first opening 210 and moves along the second direction, thereby driving the cover body 310 to move and open the second opening 220, so that the electrolyte can smoothly enter the interior of the battery shell; when the interior of the battery shell is evacuated, the electrolyte inside the battery shell that is not completely infiltrated with the active material in the battery cell has a tendency to flow from the second opening 220 into the drainage channel 230 and flow along the first direction. At this time, the cover body 310 also moves along the first direction and shields the first opening 210 under the action of the thrust generated by the flow of the electrolyte.

[0060] Please refer to FIG. 7 and FIG. 8 . Further, the cover body 310 may be provided with one (for example, only one cover body 310 is provided in FIG. 7 ), or may be provided with multiple (for example, two cover bodies 310 are provided in FIG. 8 ), which is not specifically limited here.

[0061] Furthermore, referring to FIG. 7 to FIG. 8 , the lower plastic structure further includes a sealing plug 400 , which is disposed at the injection port 110 and is used to seal the injection port 110 . After the electrolyte injection is completed, the injection port 110 is sealed by the sealing plug 400 to prevent leakage of the electrolyte.

[0062] Another embodiment provides an end cover assembly 10, which includes a top cover plate 12 and a lower plastic structure 11 as described in any of the above embodiments.

[0063] Further, referring to Figures 1 and 2, the lower plastic structure 11 is disposed on one side of the top cover plate 12 and is stacked with the top cover plate. The top cover plate 12 is provided with a liquid injection through hole 13, and the liquid injection through hole 13 is connected to the liquid injection port 110. The staff can inject electrolyte into the battery housing through the liquid injection through hole 13, and the electrolyte flows into the liquid injection port 110 through the liquid injection through hole, and then enters the battery housing through the drainage channel 230.

[0064] Another embodiment provides an energy storage device, which includes a shell, a battery cell and the end cap assembly 10 described in the above embodiment. The shell has a connected opening and a receiving cavity, the battery cell is placed in the receiving cavity, and the end cap assembly 10 is sealed to the opening.

[0065] Furthermore, the energy storage device in this embodiment may be a battery cell or a battery pack composed of a plurality of battery cells, etc., which is not specifically limited here.

[0066] Still another embodiment provides an electrical device, the electrical device comprising the energy storage device described in the above embodiment, the energy storage device being used to supply power to the electrical device.

[0067] Furthermore, the electrical equipment in this embodiment can be electronic products such as mobile phones, laptops, etc., or transportation vehicles such as electric bicycles, electric cars, etc., which are not specifically limited here. The energy storage device can supply power to the above electrical equipment to ensure the normal operation of the electrical equipment.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A lower plastic structure, characterized in that: include: A main body, wherein the main body is provided with a liquid injection port; A liquid injection cylinder, the liquid injection cylinder is arranged on the main body and has a drainage channel, the two ends of the drainage channel are respectively provided with a first opening and a second opening, the first opening is communicated with the liquid injection port, and a communication port is opened on the side wall of the liquid injection cylinder, and the communication port is communicated with the drainage channel; a stopper, the stopper being movably disposed on the drainage channel and used for opening or covering the first opening; as well as, A cover body is movably disposed on the liquid injection cylinder and located in the drainage channel, and the cover body is used to abut against the stopper.

2. The lower plastic structure according to claim 1, characterized in that: The lower plastic structure further includes a mounting member, which is disposed at the second opening. The cover body has a first side and a second side opposite to each other. The first side is rotatably disposed at the mounting member, and the second side is used to abut against the stopper.

3. The lower plastic structure according to claim 2, characterized in that: The mounting member includes a connecting portion and a mounting shaft, the connecting portion is arranged along the circumference of the second opening, the mounting shaft is rotatably arranged on the connecting portion, and the first side is arranged on the mounting shaft.

4. The lower plastic structure according to claim 3, characterized in that: The installation shafts are provided with at least two and are arranged at intervals along the circumference of the connecting portion, and the cover bodies are provided with at least two and are arranged one-to-one corresponding to the installation shafts.

5. The lower plastic structure according to claim 1, characterized in that: The communication ports are provided with at least two and are spaced apart along the circumference of the liquid injection cylinder.

6. The lower plastic structure according to claim 1, characterized in that: The direction in which the second opening faces the first opening is set as a first direction, and the communication port is extended along the first direction.

7. The lower plastic structure according to claim 1, characterized in that: The stopper comprises a stopper ball, and the stopper ball is provided with an air guide channel.

8. The lower plastic structure according to claim 7, characterized in that: The air guide channel includes at least two first annular grooves and at least two second annular grooves, all of the first annular grooves are spaced apart along the first axis direction of the stop ball, and all of the second annular grooves are spaced apart along the second axis direction of the stop ball, and the first axis direction forms an angle with the second axis direction so that each of the first annular grooves intersects with each of the second annular grooves.

9. An end cap assembly, characterized in that: The end cover assembly comprises a top cover plate and a lower plastic structure as described in any one of claims 1 to 8, wherein the top cover plate and the lower plastic structure are stacked.

10. An energy storage device, characterized in that: The energy storage device comprises a shell, a battery cell and an end cap assembly as claimed in claim 9, wherein the shell has a communicating opening and a receiving cavity, the battery cell is placed in the receiving cavity, and the end cap assembly is sealed to the opening.

11. An electrical device, characterized in that: The electrical equipment comprises the energy storage device as claimed in claim 10, and the energy storage device is used to supply power to the electrical equipment.

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