Battery cell, battery, and electric device

Abstract

The application relates to a battery monomer, which comprises a shell, an electric core and a flow guide column. When liquid injection is carried out, electrolyte can be injected into the flow guide channel through the liquid injection hole, the electrolyte can flow downwards along the flow guide channel until it flows out from the liquid guide hole and wets the electric core. Since the liquid guide hole is located on the side of the air guide hole far from the liquid injection hole, that is, the liquid guide hole is located below the air guide hole, the electrolyte will sequentially wet the electric core from bottom to top, and the residual air in the shell will be squeezed out from bottom to top. The squeezed-out air can enter the flow guide channel from the air guide hole on the top and be discharged through the liquid injection hole. It can be seen that 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, and accumulation near the air guide hole and the liquid injection hole can be avoided, so that the air in the shell can be discharged in an orderly manner. Therefore, the standing time can be reduced, and the liquid injection efficiency can be improved. In addition, the application also provides a battery and a power utilization device.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] During battery assembly, electrolyte needs to be injected into the casing. Typically, the casing has an injection hole through which electrolyte is injected directly. Simultaneously, any residual gas inside the casing must escape through this hole. However, because the area around the injection hole is often saturated with electrolyte, gas escape is difficult. To allow for proper gas removal, the casing needs to be left to stand for a period after injection to allow the electrolyte near the injection hole to diffuse. This process wastes considerable time, resulting in low injection efficiency. Summary of the Invention

[0003] Therefore, it is necessary to provide a battery cell with higher liquid injection efficiency to address the above problems.

[0004] A single battery cell, comprising:

[0005] A housing, wherein the housing is provided with a liquid injection hole;

[0006] A battery cell, housed within the casing, the battery cell having a central hole; and

[0007] The guide column has an axially extending guide channel inside. The guide column passes through the central hole and connects the guide channel with the injection hole. The guide column has an air guide hole and a liquid guide hole that communicate with the guide channel. The air guide hole and the liquid guide hole are spaced apart 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.

[0008] In one embodiment, the flow channel extends axially through the flow guide column, with one axial opening of the flow guide column communicating with the injection hole, and the other opening forming the flow guide hole.

[0009] In one embodiment, one end of the guide column passes through the injection hole and is welded to the inner wall of the injection hole.

[0010] In one embodiment, the housing is further provided with an electrode post, the liquid injection hole is provided on the electrode post, the two ends of the battery cell are respectively provided with a first electrode tab and a second electrode tab, the current guide post is conductive, the current guide post passes through the battery cell, and the two ends of the current guide post are electrically connected to the first electrode tab and the electrode post respectively, and the second electrode tab is electrically connected to the housing.

[0011] In one embodiment, a first current collector is further included, which is disposed on the side of the cell facing away from the electrode post and welded to the first electrode tab, and the end of the current guide post away from the electrode post is welded to the first current collector.

[0012] In one embodiment, a second current collector is further included, which is disposed on the side of the cell facing the electrode post and welded to the second electrode tab. The edge of the second current collector is welded to the inner wall of the housing, and the current guide post passes through the second current collector and forms insulation between the current collector and the second current collector.

[0013] In one embodiment, an insulating ring is further included, which is sleeved on the current guide post and pressed against the side of the cell facing the electrode post.

[0014] In one embodiment, the axial dimension of the guide column is adjustable.

[0015] In one embodiment, the guide column includes a telescopic section that is capable of elastic deformation along the axial direction of the guide column.

[0016] In one embodiment, the telescopic section includes a plurality of elastic connecting pieces spaced circumferentially along the guide column, each of the elastic connecting pieces being able to extend and bend along the axial direction of the guide column, and the gap between two adjacent elastic connecting pieces forming the air guide hole.

[0017] In one embodiment, each of the elastic connecting pieces is arc-shaped and protrudes in a direction opposite to the axis of the guide post.

[0018] In one embodiment, each of the elastic connecting pieces includes two interconnected straight segments, and the connection portion of the two straight segments protrudes in a direction away from the axis of the guide column.

[0019] In the aforementioned battery cell, during electrolyte injection, the electrolyte is injected into the flow channel through the injection hole. The electrolyte flows downwards along the flow channel until it flows out from the injection hole and wets the cell. Since the flow hole is located on the side away from the vent hole, i.e., below the vent hole, the electrolyte wets the cell sequentially from bottom to top, squeezing out residual air inside the casing from bottom to top. The squeezed-out air can enter the flow channel through the vent hole above and exit through the injection hole. It is evident that the electrolyte injection path and the air exit path do not overlap. Moreover, the electrolyte in the flow channel flows downwards promptly, preventing accumulation near the vent hole and injection hole, thus allowing air inside the casing to exit in an orderly manner. Therefore, the settling time can be reduced, thereby improving the electrolyte injection efficiency.

[0020] In addition, the present invention also provides a battery and an electrical device.

[0021] A battery comprising a plurality of battery cells as described in any of the preferred embodiments above.

[0022] An electrical device includes a battery cell as described in any of the preferred embodiments above or a battery as described in the preferred embodiments above. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a battery cell in a preferred embodiment of the present invention;

[0025] Figure 2 for Figure 1 The cell shown is a cross-sectional view along AA.

[0026] Figure 3 for Figure 1 The diagram shows the structure of the current-guiding column in the battery cell.

[0027] Figure 4 for Figure 3 An enlarged schematic diagram of the telescopic section in the guide column shown;

[0028] Figure 5 This is a schematic diagram of the flow guide column in another embodiment of the present invention;

[0029] Figure 6 for Figure 5 An enlarged schematic diagram of the telescopic section in the guide column shown. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening 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 possible implementation.

[0036] This invention discloses an electrical device, a battery, and a battery cell. The electrical device includes the battery or the battery cell and is capable of providing electrical energy. The electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, drop towers, etc. This application does not impose any special restrictions on the aforementioned electrical devices.

[0037] For new energy vehicles, the aforementioned batteries can serve as a driving power source, thereby replacing fossil fuels to provide driving power.

[0038] The aforementioned battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. Multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system to form a battery pack. The battery management system controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be connected in series and / or parallel, and then connected with a module management system to form a battery module. These battery modules can then be electrically connected in series, parallel, or a combination of series and parallel connections, and together with the battery management system, form a battery pack.

[0039] In this embodiment, multiple battery cells in the aforementioned battery pack or battery module can be mounted on supporting structures such as housings, frames, or brackets. The individual battery cells and the battery management system can be electrically connected via busbars. The battery cells can be lithium-ion, sodium-ion, or magnesium-ion batteries, and their external contours can be cylindrical, flat, cuboid, or other shapes, but are not limited to these. Specifically, in this embodiment, the battery cell is a cylindrical lithium-ion battery.

[0040] Please see Figure 1 and Figure 2 In a preferred embodiment of the present invention, the battery cell 10 includes a housing 100, a cell 200, and a current guide column 300.

[0041] The casing 100 can be formed from materials such as aluminum or stainless steel, and has an internal cavity (not shown) capable of accommodating the battery cell 200, the current guide column 300, and other components such as the electrolyte. The external contour of the casing 100 determines the external contour of the battery cell 10. Since the battery cell 10 in this embodiment is a cylindrical battery, the casing 100 is cylindrical.

[0042] An electrode post 110 is provided on the housing 100, penetrating the housing 100 along its thickness direction and forming an insulation between the electrode post 110 and the housing 100. Specifically, a mounting hole (not shown in the figure) is provided on the housing 100, the electrode post 110 is inserted into the mounting hole, and an insulating sleeve is provided between the electrode post 110 and the inner wall of the mounting hole. Further, an injection hole 111 is provided on the housing 100. The injection hole 111 can be located on the electrode post 110 or in other areas of the housing 100. Specifically, in this embodiment, the electrode post 110 has an injection hole 111. The injection hole 111 penetrates the electrode post 110 axially, and electrolyte can be injected into the housing 100 through the injection hole 111. After the injection is completed, the injection hole 111 can be sealed by a sealing pin 400 or by laser melting.

[0043] The battery cell 200 is housed within the receiving cavity of the casing 100 and is the core component of the battery cell 10. The battery cell 200 is generally formed by winding a positive electrode, a negative electrode, and a separator that insulates between the negative and positive electrodes. The battery cell 200 is cylindrical and conforms to the shape of the casing 100. Furthermore, the battery cell 200 has a central hole (not shown), which is concentrically positioned and extends axially through the battery cell 200. In addition, the battery cell 200 has a first tab (not shown) and a second tab (not shown) at its two ends, which are electrically connected to the terminal post 110 and the casing 100, respectively.

[0044] In this embodiment, the first tab refers to the positive tab and is located below the cell 200; the second tab refers to the negative tab and is located above the cell 200. Thus, the terminal post 110 and the casing 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, facilitating electrical connection when the battery cells 10 are grouped together.

[0045] Please refer to the following: Figure 3 and Figure 4 The current-guiding post 300 is elongated and passes through the central hole. The current-guiding post 300 has a certain mechanical strength and can be molded from metal or plastic. To ensure conductivity, the current-guiding post 300 in this embodiment can be molded from metals such as copper or aluminum. The current-guiding post 300 provides support from within the battery cell 200, effectively preventing the inner electrode sheets of the battery cell 200 from unwinding and expanding inwards, thereby ensuring good contact at the interface of the inner electrode sheets of the battery cell 200.

[0046] Furthermore, the battery cell 200 generates heat during charging and discharging, and the larger the diameter of the battery cell 200, the more difficult it is for the internal heat to dissipate. The current-guiding column 300 also plays a role in heat conduction, thereby accelerating the outward dissipation of heat generated inside the battery cell 200. Therefore, the placement of the current-guiding column 300 can also reduce the difference 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 some extent, improving the lifespan of the battery cell 10.

[0047] Furthermore, the guide column 300 has an axially extending guide channel 301 inside, which communicates with the injection hole 111. The guide column 300 has a vent hole 302 and a liquid guide hole 303 communicating with the guide channel 301. The vent hole 302 and the liquid guide hole 303 are spaced apart along the axial direction of the guide column 300, and the liquid guide hole 303 is located on the side of the vent hole 302 furthest from the injection hole 111. That is, the liquid guide hole 303 is farther from the injection hole 111 than the vent hole 302. In practical applications, the liquid guide hole 303 is located below the vent hole 302.

[0048] During electrolyte injection, electrolyte can be 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 from the liquid guide hole 303 and wets the battery cell 200. Since the liquid guide hole 303 is located below the air guide hole 302 and close to the lower part of the battery cell 200, the electrolyte will wet the battery cell from bottom to top.

[0049] The electrolyte entering the housing 100 can squeeze out residual air from bottom to top. The squeezed air enters the flow channel 301 through the upper vent 302 and is discharged through the injection hole 111. It is evident that the electrolyte injection path and the air discharge path do not overlap, allowing air to exit along different paths. Furthermore, the electrolyte in the flow channel 301 can flow downwards promptly, preventing accumulation near the vent 302 and injection hole 111, thus enabling orderly air discharge. Therefore, there is no need to wait for the electrolyte near the injection hole 111 to diffuse; the injection operation can continue, thereby improving injection efficiency.

[0050] Moreover, when the electrolyte level inside the housing 100 is flush with the vent 302, the electrolyte in the flow channel 301 can also enter the housing 100 through the vent 302, thereby wetting the battery cell 200 from top to bottom, thus making the wetting effect on the battery cell 200 more uniform.

[0051] The air guide hole 302 and the liquid guide hole 303 can be round holes, square holes, strip holes, etc. Specifically, in this embodiment, the flow guide channel 301 extends through the flow guide column 300 along the axial direction so that the flow guide column 300 has a hollow structure with openings at both ends. The flow column 300 extends through the battery cell 200, and the opening at one end is connected to the liquid injection hole 111, while the opening at the other end constitutes the liquid guide hole 303.

[0052] On the one hand, the longer length of the guide column 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, i.e., the liquid guide hole 303, and then flow out from the liquid guide hole 303 to wet the battery cell 200. It can be seen that the injected electrolyte will first flow to the farthest end (bottom of the battery cell 200), and gradually expel the residual air in the casing 100 from far to near, resulting in better venting and wetting effects.

[0053] Furthermore, in this embodiment, one end of the flow guide column 300 passes through the injection hole 111 and is welded to the inner wall of the injection hole 111, so as to fix the flow guide column 300 to the pole column 110 and make the flow guide channel 301 communicate with the injection hole 111.

[0054] Specifically, the end face of the guide column 300 that penetrates the injection hole 111 can extend to be flush with the outer surface of the electrode 110, and can be welded to the electrode 110 by seam filling welding. In this way, the weld mark between the guide column 300 and the electrode 110 can be annular and have a large area, so the weld mark is not easy to fall off during long-term use or in a vibration environment.

[0055] In addition, in this embodiment, the current guide post 300 is conductive, the current guide post 300 penetrates the battery cell 200, and the two ends of the current guide post 300 are electrically connected to the first electrode tab and the electrode post 110, respectively.

[0056] The current-guiding post 300 facilitates both electrolyte flow and current conduction. It can be made of metals with high conductivity, such as copper or aluminum, and has a lower resistivity compared to the casing 100. Furthermore, the current-guiding post 300 can transfer current from the side of the cell 200 furthest from the terminal 110 to the same side of the terminal 110, effectively shortening the current transmission path compared to conducting electricity through the casing 100. Therefore, the current-guiding post 300 reduces the internal resistance of the battery cell 10 during operation and decreases heat generation.

[0057] Furthermore, in this embodiment, the battery cell 10 also includes a first current collector 500, which is disposed on the side of the cell 200 facing away from the terminal post 110 and welded to the first electrode tab. The end of the current guide post 300 away from the terminal post 110 is welded to the first current collector 500.

[0058] During the assembly of the battery cell 10, the current guide post 300 can be welded to the first current collector plate 500 first, and then the current guide post 300 can be inserted into the center hole of the cell 200. The first current collector plate 500 can increase the contact area between the current guide post 300 and the first electrode tab, thereby reducing the conductivity resistance of the current guide post 300. In addition, the first current collector plate 500 can axially limit the electrode plates of the cell 200, and together with the support of the current guide post 300 from the inside out, it can also effectively prevent the cell 200 from undergoing core pulling deformation under the action of gravity.

[0059] Specifically, in this embodiment, the battery cell 10 further includes a second current collector 600. The second current collector 600 is disposed on the side of the cell 200 facing the terminal post 110 and welded to the second electrode tab. The edge of the second current collector 600 is welded to the inner wall of the housing 100. The current guide post 300 passes through the second current collector 600 and forms insulation between it and the second current collector 600. The second current collector 600 can increase the contact area between the housing 100 and the second electrode tab and can shorten the current transmission path, thereby reducing the conductivity resistance of the housing 100.

[0060] Furthermore, in this embodiment, the battery cell 10 also includes an insulating ring 700. The insulating ring 700 is sleeved on the current guide post 300 and pressed against the side of the cell 200 facing the terminal post 110, so that insulation is formed between the current guide post 300 and the second current collector 600. The insulating ring 700 can remain stable under the constraint of the current guide post 300, thereby ensuring the reliability of the insulation between the current guide post 300 and the second current collector 600.

[0061] In this embodiment, the axial dimension of the guide column 300 is adjustable. The axial dimension of the guide column 300 is its length, meaning that the guide column 300 can be lengthened or shortened. In other words, the connection between the guide column 300 and the pole post 110 is similar to a floating connection.

[0062] In practical applications, vibration is inevitable, which may cause the cell 200 and the current guide post 300 to shift axially. Since the axial dimension of the current guide post 300 is adjustable, it can be lengthened or shortened as needed when the current guide post 300 shifts axially, thereby reducing the pulling force on the weld between the electrode post 110 and the current guide post 300. This makes the weld between the electrode post 110 and the current guide post 300 less likely to loosen, improving the reliability of the battery cell 10.

[0063] Furthermore, in this embodiment, the guide column 300 includes a telescopic section 310, which is capable of elastic deformation along the axial direction of the guide column 300 to adjust the axial dimension of the guide column 300.

[0064] Specifically, the telescopic section 310 can undergo elastic deformation upon impact, thereby automatically adjusting the length of the guide column 300, resulting in a faster response and better buffering effect. The telescopic section 310 is typically located in the area outside the central hole of the guide column 300, specifically in the area between the cell 200 and the electrode post 110. Thus, when the length of the guide column 300 changes, the portion of the guide column 300 within the central hole maintains its shape, preventing relative movement between the guide column 300 and the central hole of the cell 200 due to telescoping, which could cause wear on the inner electrode sheets of the cell 200.

[0065] It should be noted that in other embodiments, the length of the guide column 300 can also be adjusted by means of integral telescopic extension. For example, the guide column 300 can be configured as a corrugated pipe. Alternatively, the guide column 300 can be made by interlocking multiple pipe segments, and the axial dimension of the guide column 300 can also be adjusted by the relative extension and contraction between the multiple pipe segments.

[0066] Furthermore, in this embodiment, the telescopic section 310 includes a plurality of elastic connecting pieces 311 arranged circumferentially along the guide column 300. Each elastic connecting piece 311 can extend and bend along the axial direction of the guide column 300 so that the telescopic section 310 undergoes elastic deformation.

[0067] Specifically, when the elastic connecting piece 311 extends, the axial dimension of the guide column 300 increases; while when the elastic connecting piece 311 bends, the axial dimension of the guide column 300 decreases. The elastic connecting piece 311 can be processed by locally etching or milling grooves on the sidewall of the guide column 300, and can be integrally formed with the rest of the guide column 300.

[0068] Furthermore, the gap between two adjacent elastic connecting pieces 311 forms the air guide hole 302, so there is no need to make additional holes on the guide column 300 to obtain the air guide hole 302. It can be seen that the guide column 300 is easier to manufacture and has higher structural strength.

[0069] It should be noted that in other embodiments, the telescopic section can also be obtained by replacing the material of a portion of the flow guide column 300 with an elastic material, or the telescopic section 310 can be configured as a corrugated pipe.

[0070] Specifically, in this embodiment, each elastic connecting piece 311 is arc-shaped, and each elastic connecting piece 311 protrudes in the direction opposite to the axis of the flow guide column 300. The arc-shaped elastic connecting piece 311 has a smooth surface, thus avoiding damage to the battery cell 200 during assembly and use.

[0071] Obviously, the elastic connecting piece 311 can take many forms, as long as it can extend and bend along the axial direction of the guide column 300.

[0072] For example, please refer to Figure 5 and Figure 6 In another embodiment, each elastic connecting piece 311 includes two interconnected straight segments, and the connecting portion of the two straight segments protrudes in a direction opposite to the axis of the guide column 300. The two straight segments can move closer or further apart under the action of an external force, thereby enabling the elastic connecting piece 311 to extend or bend.

[0073] In the aforementioned battery cell 10, during electrolyte injection, the electrolyte is injected into the flow channel 301 through the injection hole 111. The electrolyte flows downward along the flow channel 301 until it flows out from the liquid guide hole 303 and wets the cell. Since the liquid guide hole 303 is located on the side of the vent hole 302 away from the injection hole 111, that is, below the vent hole 302, the electrolyte wets the cell sequentially from bottom to top, squeezing out residual air in the casing from bottom to top. The squeezed-out air can enter the flow channel 301 through the upper vent hole 302 and be discharged through the injection hole 111. It can be seen that the electrolyte injection path and the air discharge path do not overlap. Moreover, the electrolyte in the flow channel 301 can flow downward in a timely manner, avoiding accumulation near the vent hole 302 and the injection hole 111, so the air in the casing can be discharged in an orderly manner. Therefore, the settling time can be reduced, thereby improving the electrolyte injection efficiency.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0075] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, include: A housing, wherein the housing is provided with a liquid injection hole, and the housing is cylindrical; A battery cell, housed within the housing, the battery cell having a central hole; and A flow guide column has an axially extending flow guide channel inside. The flow guide column passes through the central hole and connects the flow guide channel with the injection hole. The flow guide column has an air guide hole and a liquid guide hole that communicate with the flow guide channel. The air guide hole and the liquid guide hole are spaced apart along the axial direction of the flow guide column, and the liquid guide hole is located on the side of the air guide hole away from the injection hole. The axial dimension of the guide column is adjustable; the guide column includes a telescopic section, which can elastically deform along the axial direction of the guide column; the telescopic section includes a plurality of elastic connecting pieces spaced apart circumferentially along the guide column, each of the elastic connecting pieces can extend and bend along the axial direction of the guide column, and the gap between two adjacent elastic connecting pieces constitutes the air guide hole.

2. The battery cell according to claim 1, characterized in that, The flow channel extends axially through the flow guide column, with one axial end of the flow guide column having an opening that communicates with the injection hole, and the other end having an opening that forms the flow guide hole.

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

4. The battery cell according to claim 1, characterized in that, The housing is also provided with an electrode post, the liquid injection hole is provided on the electrode post, the two ends of the battery cell are respectively provided with a first electrode tab and a second electrode tab, the current guide post is conductive, the current guide post passes through the battery cell, and the two ends of the current guide post are electrically connected to the first electrode tab and the electrode post respectively, and the second electrode tab is electrically connected to the housing.

5. The battery cell according to claim 4, characterized in that, It also includes a first current collector, which is disposed on the side of the cell facing away from the electrode post and welded to the first electrode tab, and the end of the current guide post away from the electrode post is welded to the first current collector.

6. The battery cell according to claim 4, characterized in that, It also includes a second current collector, which is disposed on the side of the cell facing the electrode post and welded to the second electrode tab. The edge of the second current collector is welded to the inner wall of the housing. The current guide post passes through the second current collector and forms insulation between the current collector and the second current collector.

7. The battery cell according to claim 6, characterized in that, It also includes an insulating gasket ring, which is sleeved on the current guide post and pressed against the side of the battery cell facing the electrode post.

8. The battery cell according to claim 1, characterized in that, Each of the elastic connecting pieces is arc-shaped, and each of the elastic connecting pieces protrudes in a direction opposite to the axis of the guide column.

9. The battery cell according to claim 1, characterized in that, Each of the elastic connecting pieces includes two interconnected straight segments, and the connection portion of the two straight segments protrudes in a direction away from the axis of the guide column.

10. A battery, characterized in that, It includes multiple battery cells as described in any one of claims 1 to 9 above.

11. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1 to 9 or a battery as described in claim 10.

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