Battery cell, battery, and electric device

Abstract

The present application relates to a battery cell, comprising a casing, a cell body, and a flow guide post. During liquid injection, an electrolyte can be injected into a flow guide channel through a liquid injection hole, and the electrolyte can flow downwards along the flow guide channel until the electrolyte flows out of the liquid guide hole and infiltrates the cell body. Because the liquid guide hole is located on the side of an air guide hole away from the liquid injection hole, namely, the liquid guide hole is located below the air guide hole, the electrolyte sequentially infiltrates the cell body from bottom to top, and extrudes out the remaining air in the casing from bottom to top. The extruded air can enter the flow guide channel from the air guide hole above, and is discharged through the liquid injection hole. Hence, the injection path of the electrolyte and the discharge path of the air do not overlap. Moreover, the electrolyte in the flow guide channel can flow downwards in time, avoiding accumulation near the air guide hole and the liquid injection hole; thus, the air in the casing can be discharged in an orderly manner. Therefore, the standing time can be reduced, thereby improving the liquid injection efficiency. In addition, the present application further provides a battery and an electric device.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] During battery assembly, electrolyte needs to be injected into the housing. Typically, the housing is provided with an injection hole, through which electrolyte is directly injected. During injection, residual gas within the housing must be discharged through the injection hole. However, since the area surrounding the injection hole is often saturated with electrolyte, this makes gas discharge difficult. To ensure smooth gas discharge, the housing must be left standing for a period of time after injection to allow the electrolyte near the injection hole to diffuse. This wastes considerable time and results in low injection efficiency.

[0003] Application Contents

[0004] Based on this, it is necessary to provide a battery cell with higher injection efficiency to address the above problems.

[0005] A battery cell, comprising:

[0006] a shell, wherein the shell is provided with a liquid injection hole;

[0007] a battery cell housed in the housing, the battery cell having a central hole; and

[0008] A guide column is formed with a guide channel extending axially therein. The guide column is inserted into the center hole and connects the guide channel with the liquid injection hole. The guide column is provided with an air guide hole and a liquid guide hole connected with the guide channel. The air guide hole and the liquid guide hole are arranged at intervals along the axial direction of the guide column, and the liquid guide hole is located on the side of the air guide hole away from the liquid injection hole.

[0009] In one embodiment, the guide channel axially penetrates the guide column, an opening at one axial end of the guide column is connected to the liquid injection hole, and an opening at the other end constitutes the liquid guide hole.

[0010] In one embodiment, one end of the guide column is passed through the liquid injection hole and welded to the inner wall of the liquid injection hole.

[0011] In one embodiment, the shell is further provided with a pole, the injection hole is provided on the pole, the two ends of the battery cell are respectively provided with a first pole ear and a second pole ear, the guide column is capable of conducting electricity, the guide column passes through the battery cell, and the two ends of the guide column are respectively electrically connected to the first pole ear and the pole, and the second pole ear is electrically connected to the shell.

[0012] In one embodiment, the first electrode tab is a positive electrode tab and is located on a side of the battery cell facing away from the pole, and the second electrode tab is a negative electrode tab and is located on a side of the battery cell facing the pole.

[0013] In one embodiment, one end of the guide column penetrates the liquid injection hole, and the end surface of the end penetrating the liquid injection hole extends to be flush with the outer surface of the pole and is welded to the pole.

[0014] In one embodiment, a first current collecting disk is further included. The first current collecting disk is provided on a side of the battery cell facing away from the pole and is welded to the first pole tab. An end of the guide column away from the pole is welded to the first current collecting disk.

[0015] In one embodiment, a second current collecting plate is further included. The second current collecting plate is arranged on the side of the battery cell facing the pole and is welded to the second pole tab. The edge of the second current collecting plate is welded to the inner wall of the shell. The guide column passes through the second current collecting plate and forms insulation between the second current collecting plate.

[0016] In one embodiment, an insulating gasket is further included, which is sleeved on the guide column and pressed on the side of the battery cell facing the pole.

[0017] In one embodiment, the axial size of the guide column is adjustable.

[0018] In one embodiment, the guide column includes a telescopic section, and the telescopic section can be elastically deformed along the axial direction of the guide column.

[0019] In one embodiment, the telescopic section includes a plurality of elastic connecting pieces arranged at intervals along the circumference of the guide column, each of the elastic connecting pieces can be extended and bent along the axial direction of the guide column, and the gap between two adjacent elastic connecting pieces constitutes the air guide hole.

[0020] In one embodiment, each of the elastic connecting pieces is arc-shaped, and each of the elastic connecting pieces protrudes in a direction away from the axis of the guide column.

[0021] In one embodiment, each of the elastic connecting pieces includes two straight segments connected to each other, and a connecting portion of the two straight segments protrudes in a direction away from the axis of the guide column.

[0022] In one embodiment, the guide column is configured in the form of a bellows.

[0023] In one embodiment, the guide column includes a plurality of plug-in pipe segments, and the plurality of pipe segments can be relatively telescopic to achieve adjustable axial dimensions of the guide column.

[0024] In one embodiment, a sealing pin is further included, and the sealing pin seals the liquid injection hole.

[0025] When the above-mentioned battery cell is injected, the electrolyte can be injected into the guide channel through the injection hole, and the electrolyte can flow downward along the guide channel until it flows out of the liquid guide hole and infiltrates the battery cell. Since the liquid guide hole is located on the side of the air guide hole away from the liquid injection hole, that is, the liquid guide hole is located below the air guide hole, the electrolyte will infiltrate the battery cell from bottom to top and squeeze out the air remaining in the shell from bottom to top. The squeezed air can enter the guide channel from the upper air guide hole and be discharged through the liquid injection hole. It can be seen that the electrolyte injection path and the air discharge path do not overlap. Moreover, the electrolyte in the guide channel can flow downward in time to avoid accumulation near the air guide hole and the liquid injection hole, so the air in the shell can be discharged in an orderly manner. Therefore, the standing time can be reduced, thereby improving the injection efficiency.

[0026] In addition, the present application also provides a battery and an electrical device.

[0027] A battery comprises a plurality of battery cells as described in any one of the preferred embodiments above.

[0028] An electrical device comprises a battery cell as described in any one of the above preferred embodiments or a battery as described in the above preferred embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0030] FIG1 is a schematic structural diagram of a battery cell in a preferred embodiment of the present application;

[0031] FIG2 is a cross-sectional view of the battery cell shown in FIG1 along line AA;

[0032] FIG3 is a schematic structural diagram of a flow guide column in the battery cell shown in FIG1 ;

[0033] FIG4 is an enlarged schematic diagram of the telescopic section of the guide column shown in FIG3 ;

[0034] FIG5 is a schematic structural diagram of a guide column in another embodiment of the present application;

[0035] FIG6 is an enlarged schematic diagram of the telescopic section of the guide column shown in FIG5 . DETAILED DESCRIPTION

[0036] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0039] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0040] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0041] It should be noted that when 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 an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0042] The present application discloses an electrical device, a battery, and a battery cell. The electrical device includes the battery or the battery cell, and can be powered by the battery or the battery cell. The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, an amusement ride, an elevator, and a lifting device. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys. Electric tools include metal cutting tools, grinding tools, assembly tools, and railway tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. Energy storage devices may be energy storage walls, base station energy storage, container energy storage, and the like. Amusement rides may be carousels, bungee jumping machines, and the like. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0043] For new energy vehicles, the above batteries can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0044] The above-mentioned battery can be a battery pack or a battery module. When the above-mentioned battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and a plurality of the above-mentioned battery cells. The plurality of battery cells can be electrically connected in series, in parallel, or in a mixture of series and parallel, and communicated with the battery management system to form a battery pack. The above-mentioned battery management system controls and monitors the working status of each battery cell. In addition, the plurality of battery cells can also be connected in series and / or in parallel first, and form a battery module with the module management system, and then the plurality of battery modules are electrically connected in series, in parallel, or in a mixture of series and parallel, and together with the battery management system form a battery pack.

[0045] The multiple battery cells in the battery pack or battery module can be mounted on a supporting structure such as a box, frame, or bracket. Electrical connections can be established between the individual battery cells and between the battery cells and the battery management system via a busbar assembly. The battery cells can be lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and their external shapes can be cylindrical, flat, rectangular, or other, but are not limited to these. Specifically, in this embodiment, the battery cells are cylindrical lithium-ion batteries.

[0046] 1 and 2 , a battery cell 10 in a preferred embodiment of the present application includes a housing 100 , a battery cell 200 and a guide post 300 .

[0047] The housing 100 can be formed from materials such as aluminum and stainless steel, and has an internal cavity (not shown) that accommodates the battery cell 200, the current guide column 300, and other components such as the electrolyte. The outer contour of the housing 100 determines the outer contour of the battery cell 10. Since the battery cell 10 in this embodiment is a cylindrical battery, the housing 100 is cylindrical.

[0048] The shell 100 is provided with a pole 110, which passes through the shell 100 in the thickness direction, and insulation is formed between the pole 110 and the shell 100. Specifically, the shell 100 is provided with a mounting hole (not marked in the figure), the pole 110 is passed through the mounting hole, and an insulating sleeve is provided between the pole 110 and the inner wall of the mounting hole. Furthermore, the shell 100 is provided with an injection hole 111. The injection hole 111 can be located on the pole 110, or in other areas of the shell 100. Specifically in the present embodiment, the pole 110 is provided with an injection hole 111. The injection hole 111 passes through the pole 110 in the axial direction, and the electrolyte can be injected into the shell 100 through the injection hole 111. After the injection is completed, the injection hole 111 can be sealed by a sealing nail 400, or the injection hole 111 can be sealed by laser melting.

[0049] The battery cell 200 is housed in the housing cavity of the shell 100 and is the core component of the battery cell 10. Among them, the battery cell 200 is generally formed by winding a positive electrode sheet, a negative electrode sheet and a diaphragm that acts as an insulator between the negative electrode sheet and the positive electrode sheet. The battery cell 200 is cylindrical and adapts to the shape of the shell 100. Moreover, the battery cell 200 has a center hole (not marked in the figure), which is concentrically arranged with the battery cell 200 and passes through the battery cell 200 axially. In addition, a first pole ear (not shown) and a second pole ear (not shown) are respectively provided at both ends of the battery cell 200, and the first pole ear and the second pole ear are electrically connected to the pole 110 and the shell 100, respectively.

[0050] In this embodiment, the first tab is the positive tab and is located below the battery cell 200; the second tab is the negative tab and is located above the battery cell 200. Thus, the terminal 110 and the housing 100 serve as the positive and negative electrodes of the battery cell 10, respectively, with the negative and positive electrodes located on the same side, thereby facilitating electrical connection when the battery cells 10 are grouped.

[0051] Please refer to Figures 3 and 4 together. The guide post 300 is long and is inserted into the center hole. The guide post 300 has a certain mechanical strength and can be formed from metal or plastic. To ensure good conductivity, the guide post 300 in this embodiment can be formed from metals such as copper and aluminum. The guide post 300 can provide support from the inside of the battery cell 200, thereby effectively preventing the inner electrode of the battery cell 200 from unwinding and expanding inward, thereby ensuring good contact between the interfaces of the inner electrode of the battery cell 200.

[0052] Furthermore, the battery cell 200 generates heat during charging and discharging, and the larger the diameter of the battery cell 200, the harder it is to dissipate the internal heat. The guide post 300 also acts as a heat conductor, accelerating the outward dissipation of heat generated within the battery cell 200. Therefore, the provision of the guide post 300 can also narrow the gap in heat dissipation efficiency between the inner and outer layers of the battery cell 200, thereby reducing the temperature difference between the inner and outer layers of the battery cell 200 and, to a certain extent, improving the lifespan of the battery cell 10.

[0053] Furthermore, the interior of the guide column 300 is formed with an axially extending guide channel 301, which is connected to the liquid injection hole 111. The guide column 300 is provided with an air guide hole 302 and a liquid guide hole 303, which are connected to the guide channel 301. The air guide hole 302 and the liquid guide hole 303 are arranged at intervals along the axial direction of the guide column 300, and the liquid guide hole 303 is located on the side of the air guide hole 302 away from the liquid injection hole 111. In other words, the liquid guide hole 303 is farther from the liquid injection hole 111 than the air guide hole 302. In actual use scenarios, the liquid guide hole 303 is located below the air guide hole 302.

[0054] During injection, the electrolyte is injected into the flow channel 301 through the injection hole 111. The electrolyte can flow downward along the flow channel 301 until it flows out of the liquid guide hole 303 and soaks the battery cell 200. Because the liquid guide hole 303 is located below the air guide hole 302 and close to the bottom of the battery cell 200, the electrolyte will soak the battery cell from bottom to top.

[0055] The electrolyte entering the shell 100 can squeeze out the air remaining in the shell 100 from the bottom to the top, and the squeezed air enters the guide channel 301 from the upper air guide hole 302 and is discharged through the injection hole 111. It can be seen that the injection path of the electrolyte and the discharge path of the air do not overlap, and the air can be discharged along different paths. Moreover, the electrolyte in the guide channel 301 can flow downward in time to avoid accumulation near the air guide hole 302 and the injection hole 111, so that the air can be discharged in an orderly manner. Therefore, there is no need to stand still to wait for the electrolyte near the injection hole 111 to diffuse, and the injection operation can be carried out continuously, thereby improving the injection efficiency.

[0056] Moreover, when the liquid level of the electrolyte in the shell 100 is flush with the air holes 302 , the electrolyte in the flow channel 301 can also enter the shell 100 through the air holes 302 , thereby infiltrating the battery cell 200 from top to bottom, making the infiltration effect on the battery cell 200 more uniform.

[0057] The air guide holes 302 and the liquid guide holes 303 can be circular holes, square holes, strip-shaped holes, etc. Specifically, in this embodiment, the flow guide channel 301 axially penetrates the flow guide column 300, so that the flow guide column 300 has a hollow structure with two ends open. The flow column 300 passes through the battery cell 200, and the opening at one end is connected to the liquid injection hole 111, and the opening at the other end constitutes the liquid guide hole 303.

[0058] On the one hand, the longer guide post 300 provides better support for the battery cell 200. On the other hand, the electrolyte entering the guide channel 301 can flow along the guide channel 301 to the distal opening, namely the guide hole 303, and then flow out through the guide hole 303 to soak the battery cell 200. As can be seen, the injected electrolyte will first flow to the farthest end (the bottom of the battery cell 200), gradually expelling any remaining air in the housing 100 from far to near, achieving better exhaust and soaking effects.

[0059] Furthermore, in this embodiment, one end of the guide column 300 is passed through the injection hole 111 and welded to the inner wall of the injection hole 111 to fix the guide column 300 to the pole 110 and connect the guide channel 301 with the injection hole 111.

[0060] Specifically, the end surface of the guide post 300 that penetrates the injection hole 111 can extend to be flush with the outer surface of the terminal 110, and can be welded to the terminal 110 by means of caulking welding. In this way, the weld mark between the guide post 300 and the terminal 110 is annular and has a large area, so it is less likely to fall off during long-term use or in a vibrating environment.

[0061] In addition, in this embodiment, the guide post 300 is conductive, passes through the battery cell 200 , and two ends of the guide post 300 are electrically connected to the first tab and the electrode 110 , respectively.

[0062] The guide post 300 not only guides the electrolyte but also conducts current. The guide post 300 can be formed of a metal with a high conductivity coefficient, such as copper or aluminum, and has a lower resistivity than the housing 100. Moreover, the guide post 300 can transfer the current from the side of the battery cell 200 away from the pole 110 to the same side of the pole 110, effectively shortening the current transmission path compared to conducting through the housing 100. Therefore, the guide post 300 can reduce the internal resistance of the battery cell 10 during operation and reduce heat generation.

[0063] Furthermore, in this embodiment, the battery cell 10 also includes a first current collecting plate 500, which is arranged on the side of the battery cell 200 facing away from the pole 110 and is welded to the first pole tab, and the end of the guide column 300 away from the pole 110 is welded to the first current collecting plate 500.

[0064] During assembly of the battery cell 10, the current guide post 300 can be welded to the first current collecting plate 500 before being inserted into the center hole of the battery cell 200. The first current collecting plate 500 increases the contact area between the current guide post 300 and the first tab, thereby reducing the conductive impedance of the current guide post 300. Furthermore, the first current collecting plate 500 acts as an axial limiter for the electrode tabs of the battery cell 200. Combined with the internal-outward support provided by the current guide post 300, this effectively prevents the battery cell 200 from deforming due to gravity.

[0065] Specifically, in this embodiment, the battery cell 10 further includes a second current collecting tray 600. The second current collecting tray 600 is disposed on the side of the battery cell 200 facing the electrode 110 and is welded to the second electrode tab. The edge of the second current collecting tray 600 is welded to the inner wall of the housing 100. The current guide post 300 passes through the second current collecting tray 600 and is insulated from the second current collecting tray 600. The second current collecting tray 600 can increase the contact area between the housing 100 and the second electrode tab and shorten the current transmission path, thereby reducing the conductive impedance of the housing 100.

[0066] Furthermore, in this embodiment, the battery cell 10 further includes an insulating washer 700. The insulating washer 700 is sleeved over the current guide post 300 and pressed against the side of the battery cell 200 facing the terminal 110 to provide insulation between the current guide post 300 and the second current collecting plate 600. The insulating washer 700 can remain stable under the restraint of the current guide post 300, thereby ensuring the reliability of the insulation between the current guide post 300 and the second current collecting plate 600.

[0067] In this embodiment, the axial dimension of the guide post 300 is adjustable. The axial dimension of the guide post 300 is the length of the guide post 300, meaning that the guide post 300 can be extended or shortened. In other words, the connection between the guide post 300 and the pole 110 is similar to a floating connection.

[0068] In actual use, vibration is inevitable, which may cause axial displacement of the battery cell 200 and the guide post 300. Since the axial dimension of the guide post 300 is adjustable, it can be extended or shortened as needed during axial displacement to reduce the strain on the weld between the terminal post 110 and the guide post 300. This prevents the weld between the terminal post 110 and the guide post 300 from loosening, thereby improving the reliability of the battery cell 10.

[0069] Furthermore, in this embodiment, the guide column 300 includes a telescopic section 310 , and the telescopic section 310 can be elastically deformed along the axial direction of the guide column 300 to adjust the axial size of the guide column 300 .

[0070] Specifically, the telescopic section 310 is capable of elastically deforming when impacted, thereby automatically adjusting the length of the guide post 300, resulting in a faster response and better cushioning. The telescopic section 310 is typically located in the area of ​​the guide post 300 outside the center hole, specifically between the battery cell 200 and the pole 110. This allows the portion of the guide post 300 located within the center hole to maintain its shape even when the length of the guide post 300 changes. This prevents the guide post 300 from moving relative to the center hole of the battery cell 200 due to expansion and contraction, thereby preventing wear on the inner pole piece of the battery cell 200.

[0071] It should be noted that in other embodiments, the guide column 300 can also be adjusted in length by being fully telescopic. For example, the guide column 300 can be configured as a bellows. Alternatively, the guide column 300 can be configured by inserting multiple pipe segments, and the axial dimension of the guide column 300 can be adjusted by the relative telescopic movement of the multiple pipe segments.

[0072] Furthermore, in this embodiment, the telescopic section 310 includes a plurality of elastic connecting pieces 311 arranged at circumferential intervals along the guide column 300, and each elastic connecting piece 311 can stretch and bend along the axial direction of the guide column 300 to cause the telescopic section 310 to undergo elastic deformation.

[0073] Specifically, when the elastic connecting piece 311 is extended, the axial dimension of the guide column 300 increases; when the elastic connecting piece 311 is bent, the axial dimension of the guide column 300 decreases. The elastic connecting piece 311 can be formed by partially etching or milling the sidewall of the guide column 300 and can be integrally formed with the rest of the guide column 300.

[0074] Moreover, the gap between two adjacent elastic connecting pieces 311 forms the air guide hole 302, so there is no need to drill additional holes on the guide column 300 to form the air guide hole 302. Therefore, the guide column 300 is easy to manufacture and has a higher structural strength.

[0075] It should be noted that, in other embodiments, the telescopic section can be obtained by replacing the material of a partial area of ​​the guide column 300 with an elastic material, or the telescopic section 310 can be configured as a bellows.

[0076] In this embodiment, each elastic connecting piece 311 is arc-shaped and protrudes in a direction away from the axis of the guide column 300. The arc-shaped elastic connecting piece 311 has a smooth surface, thereby preventing damage to the battery cell 200 during assembly and use.

[0077] Obviously, the elastic connecting piece 311 can be of various shapes, as long as it can be stretched and bent along the axial direction of the guide column 300 .

[0078] For example, referring to Figures 5 and 6 , in another embodiment, each elastic connecting piece 311 includes two interconnected straight segments, with the connecting portion of the two straight segments protruding in a direction away from the axis of the guide column 300. Under the action of an external force, the two straight segments can move closer or farther away from each other, thereby causing the elastic connecting piece 311 to stretch or bend.

[0079] During the injection of the battery cell 10, electrolyte is injected into the flow channel 301 through the injection hole 111. The electrolyte then flows downward along the flow channel 301 until it exits through the liquid guide hole 303 and soaks the battery cells. Because the liquid guide hole 303 is located on the side of the air guide hole 302 away from the liquid guide hole 111, that is, below the air guide hole 302, the electrolyte sequentially soaks the battery cells from the bottom up, displacing any remaining air within the housing. The displaced air then enters the flow channel 301 from the upper air guide hole 302 and is expelled through the liquid injection hole 111. As can be seen, the electrolyte injection path and the air exhaust path do not overlap. Furthermore, the electrolyte in the flow channel 301 flows downward promptly, preventing accumulation near the air guide hole 302 and the liquid injection hole 111. This allows for orderly exhaust of air within the housing. This reduces the rest time and improves injection efficiency.

[0080] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0081] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A shell, wherein the shell is provided with a liquid injection hole; A battery cell is contained in the shell, and the battery cell has a central hole; and A guide column is formed with a guide channel extending axially therein, the guide column is passed through the center hole and connects the guide channel with the injection hole, the guide column is provided with an air guide hole and a liquid guide hole connected with the guide channel, the air guide hole and the liquid guide hole are arranged at intervals along the axial direction of the guide column, and the liquid guide hole is located on the side of the air guide hole away from the injection hole.

2. The battery cell according to claim 1, characterized in that: The guide channel penetrates the guide column in the axial direction, an opening at one axial end of the guide column is communicated with the liquid injection hole, and an opening at the other end constitutes the liquid guide hole.

3. The battery cell according to claim 2, characterized in that: One end of the guide column is passed through the liquid injection hole and welded to the inner wall of the liquid injection hole.

4. The battery cell according to claim 1, characterized in that: The shell is also provided with a pole, the injection hole is provided on the pole, the two ends of the battery cell are respectively provided with a first pole ear and a second pole ear, the guide column is capable of conducting electricity, the guide column runs through the battery cell, and the two ends of the guide column are respectively electrically connected to the first pole ear and the pole, and the second pole ear is electrically connected to the shell.

5. The battery cell according to claim 4, characterized in that: The first pole lug is a positive pole lug and is located on a side of the battery cell facing away from the pole, and the second pole lug is a negative pole lug and is located on a side of the battery cell facing the pole.

6. The battery cell according to claim 4, characterized in that: One end of the guide column penetrates the injection hole, and the end surface of the end penetrated into the injection hole extends to be flush with the outer surface of the pole and is welded to the pole.

7. The battery cell according to claim 4, characterized in that: It also includes a first current collecting plate, which is arranged on a side of the battery cell facing away from the pole and is welded to the first pole lug, and one end of the guide column away from the pole is welded to the first current collecting plate.

8. The battery cell according to claim 4, characterized in that: It also includes a second current collecting plate, which is arranged on the side of the battery cell facing the pole and welded to the second pole ear, the edge of the second current collecting plate is welded to the inner wall of the shell, and the guide column passes through the second current collecting plate and forms insulation with the second current collecting plate.

9. The battery cell according to claim 8, characterized in that: It also includes an insulating gasket ring, which is sleeved on the guide column and pressed on a side of the battery cell facing the pole.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The axial dimension of the guide column is adjustable.

11. The battery cell according to claim 10, characterized in that: The guide column comprises a telescopic section, and the telescopic section can be elastically deformed along the axial direction of the guide column.

12. The battery cell according to claim 11, characterized in that: The telescopic section includes a plurality of elastic connecting pieces spaced apart along the circumference of the guide column, each of the elastic connecting pieces can be stretched and bent along the axial direction of the guide column, and the gap between two adjacent elastic connecting pieces constitutes the air guide hole.

3. The battery cell according to claim 12, characterized in that: Each of the elastic connecting pieces is in an arc shape, and each of the elastic connecting pieces protrudes in a direction away from the axis of the guide column.

14. The battery cell according to claim 12, characterized in that: Each of the elastic connecting pieces includes two straight line segments connected to each other, and a connecting portion of the two straight line segments protrudes in a direction away from the axis of the guide column.

15. The battery cell according to claim 10, characterized in that: The guide column is configured in the form of a bellows.

16. The battery cell according to claim 10, characterized in that: The guide column includes a plurality of plug-in pipe sections, and the plurality of pipe sections can be relatively telescopic to achieve adjustable axial dimensions of the guide column.

17. The battery cell according to claim 1, characterized in that: It also includes a sealing nail, which seals the injection hole.

18. A battery, characterized in that: The battery comprises a plurality of battery cells as claimed in any one of claims 1 to 17.

19. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 7 or a battery as claimed in claim 18.

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