Battery cell, battery, and electrical apparatus

Abstract

A battery cell (10), comprising: a housing assembly (100), a cell (200), and a flow guide column (300). The housing assembly (100) comprises a housing (110) having an opening at one end, and a top cover (120), the top cover (120) sealing on the opening and forming insulation with the housing (110); the cell (200) is accommodated in the housing (110); the flow guide column (300) is disposed in the cell (200) along the axial direction thereof and is separately electrically connected to the cell (200) and the top cover (120), the flow guide column (300) comprising an extension and retraction section (310) capable of extending and retracting along the axial direction. When the housing assembly (100) generates axial compression under the action of an external force, to form a sealing structure used to seal the top cover (120), the extension and retraction section (310) can be compressed along with movement of the top cover (120).

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] Traditional cylindrical batteries are typically equipped with poles, which are typically riveted to the housing and insulated from the housing using plastic or insulating gaskets. After long-term use, factors such as increased temperature or internal pressure can cause the riveting strength to decrease, increasing the risk of leakage, such as liquid or air leaks, at the junction between the housing and the pole. To improve reliability, more and more cylindrical batteries are adopting a pole-less structure, where the entire top cover serves as the pole.

[0003] The top cover and shell of a non-polar cylindrical battery are typically installed using a roller groove sealing method. This involves pressing a roller groove into the shell and folding the edge of the shell open to wrap around the top cover, thereby securing the top cover in place. The top cover serves as the positive electrode, while the edge of the top cover wraps around the negative electrode. Rolling the groove compresses the space in the cylindrical battery axially. To prevent the weld between the battery cell and the top cover from tearing during the rolling process, a positive electrode sheet is typically drawn from the battery cell and welded to the top cover. This increases the internal impedance of the battery, thus affecting battery performance.

[0004] Application Contents

[0005] Based on this, it is necessary to provide a battery cell and a battery with higher reliability and lower impedance to address the above problems.

[0006] A battery cell, comprising:

[0007] The housing assembly comprises a shell with an opening at one end and a top cover, wherein the top cover is sealed at the opening and insulated from the shell;

[0008] a battery cell housed in the housing;

[0009] a guide column, axially disposed in the battery core and conductively connected to the battery core and the top cover, respectively, the guide column comprising a telescopic section that can be telescoped along the axial direction;

[0010] Wherein, when the housing assembly is axially compressed under the action of an external force to form a packaging structure for packaging the top cover, the telescopic section can be compressed along with the movement of the top cover.

[0011] In one embodiment, the battery cell has a center hole, a first pole ear is provided on the side of the battery cell facing away from the top cover, and a second pole ear is provided on the side facing the top cover, the second pole ear is electrically connected to the shell, and the guide column is provided in the center hole and electrically connected to the first pole ear.

[0012] In one embodiment, the packaging structure includes a roller groove and an annular edging, the roller groove is formed on the outer peripheral wall of the shell near one end of the opening, the annular edging is formed on the opening edge of the shell, and the top cover is limited between the roller groove and the annular edging.

[0013] In one embodiment, the housing assembly further includes an annular insulating sleeve, which covers the edge of the top cover.

[0014] In one embodiment, the first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

[0015] In one embodiment, the battery cell further includes a first current collecting plate, which is disposed on a side of the battery cell facing away from the top cover and welded to the first tab, and the end of the guide column away from the top cover is welded to the first current collecting plate.

[0016] In one embodiment, the battery cell further includes a second current collecting plate, which is arranged on the side of the battery cell facing the top cover and welded to the second pole tab, 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 between the second current collecting plate.

[0017] In one embodiment, the battery cell further includes an insulating gasket, which is sleeved on the guide column and pressed on a side of the battery cell facing the top cover.

[0018] In one embodiment, the telescopic section is capable of elastically deforming along the axial direction of the guide column.

[0019] In one embodiment, the telescopic section includes a plurality of elastic connecting pieces spaced apart along the circumference of the guide column, and each of the elastic connecting pieces can be extended and bent along the axial direction of the guide column.

[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 top cover is provided with a liquid injection hole, and a guide channel extending axially is formed inside the guide column, the guide channel is connected with the liquid injection hole, and 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.

[0023] For the above-mentioned battery cell, the top cover can be connected to the shell by means of roller groove sealing. Since the telescopic section of the guide column can be extended and retracted in the axial direction, the guide column can automatically adjust its length according to the degree of compression of the shell assembly in the axial direction during the sealing process, thereby avoiding tearing at the connection between the guide column and the top cover. Moreover, the top cover is electrically connected to the battery cell through the guide column, so the top cover can be used as an electrode of the battery cell as a whole without the need for additional poles, thereby reducing the risk of leakage and gas leakage and improving the reliability of the battery cell. Furthermore, when the current output by the battery cell is transmitted along the guide column to the top cover, its transmission path is shorter than the transmission path when transmitted along the shell, and its internal resistance is also smaller. Therefore, the above-mentioned battery cell has high reliability and low impedance.

[0024] In addition, the present application also provides a battery and an electrical device.

[0025] A battery comprises a plurality of battery cells as described in any one of the preferred embodiments above.

[0026] 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

[0027] 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.

[0028] FIG1 is a schematic structural diagram of a battery cell in a preferred embodiment of the present application;

[0029] FIG2 is a cross-sectional view of the battery cell shown in FIG1 along line AA;

[0030] FIG3 is a schematic structural diagram of a flow guide column in the battery cell shown in FIG1 ;

[0031] FIG4 is an enlarged schematic diagram of the telescopic section of the guide column shown in FIG3 ;

[0032] FIG5 is a schematic structural diagram of a guide column in another embodiment of the present application;

[0033] FIG6 is an enlarged schematic diagram of the telescopic section of the guide column shown in FIG5 . DETAILED DESCRIPTION

[0034] 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.

[0035] 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 to 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] For new energy vehicles, the above batteries can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0042] 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.

[0043] 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.

[0044] 1 and 2 , a battery cell 10 in a preferred embodiment of the present application includes a housing assembly 100 , a battery cell 200 and a guide post 300 .

[0045] The housing assembly 100 includes a housing 110 and a top cover 120. The housing 110 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 110 determines the outer contour of the battery cell 10. Since the battery cell 10 in this embodiment is a cylindrical battery, the housing 110 is cylindrical.

[0046] One end of the housing 110 is open, and the top cover 120 is enclosed in the opening of the housing 110 and insulates the housing 110. Components such as the battery cell 200 and the guide column 300 can be installed into the housing 110 through the opening, and the top cover 120 then seals the opening of the housing 110. The material of the top cover 120 can be the same as that of the housing 110, or it can be formed from a metal with high conductivity, such as copper or aluminum. Specifically, the shape of the top cover 120 matches the shape of the opening of the housing 110. Specifically, in this embodiment, the top cover 120 is disc-shaped.

[0047] The housing assembly 100 can be axially compressed under external force to form a packaging structure for encapsulating the top cover 120. Specifically, the top cover 120 can be fixedly connected to the housing 110 using a roller groove sealing method, thereby sealing the opening of the housing 110. In this embodiment, the packaging structure includes a roller groove 111 and an annular edge 112. The roller groove 111 is formed in the outer peripheral wall of the housing 110 near one end of the opening, and the annular edge 112 is formed at the edge of the opening of the housing 110. The top cover 120 is constrained between the roller groove 111 and the annular edge 112.

[0048] This eliminates the need for laser welding during assembly. Compared to laser welding, the roller groove sealing process requires less precision in structural components, thus improving production yields.

[0049] Furthermore, in this embodiment, the housing assembly 100 further includes an annular insulating sleeve 130 that covers the edge of the top cover 120 to provide insulation between the top cover 120 and the housing 110. The insulating sleeve 130 can be pre-covered around the edge of the top cover 120 before molding. Therefore, the insulating sleeve 130 is unlikely to shift relative to the top cover 120 during the molding process, thereby ensuring insulation effectiveness.

[0050] The housing assembly 100 is also provided with an injection hole (indicated by a symbol in the figure) through which electrolyte can be injected into the housing 110. After injection, the injection hole can be sealed with a sealing pin 400 or by laser melting. Specifically, in this embodiment, the injection hole is provided on the top cover 120.

[0051] The battery cell 200 is housed in the housing cavity of the shell 110 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 matches the shape of the shell 110. 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 in the figure) and a second pole ear (not shown in the figure) are respectively provided at both ends of the battery cell 200. In this embodiment, the first pole ear refers to the positive pole ear, and is located below the battery cell 200; the second pole ear refers to the negative pole ear, and is located above the battery cell 200.

[0052] Furthermore, the second tab is electrically connected to the housing 110, so the housing 110, specifically the annular edge 112, can serve as the negative electrode of the battery cell 10. Furthermore, the second tab is located on the side of the battery cell 200 facing the top cover 120, so the current transmission path between the second tab and the annular edge 112 is shorter, which helps reduce the negative electrode impedance of the battery cell 10.

[0053] Referring to Figures 3 and 4 , the guide post 300 is an elongated strip extending through the center hole. It possesses a certain degree of mechanical strength and is typically formed from a highly conductive metal such as copper, aluminum, or an alloy thereof. The guide post 300 provides support from within the battery cell 200, effectively preventing the inner electrode sheets from unwinding and expanding inward, thereby ensuring good contact between the inner electrode sheets.

[0054] 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.

[0055] Furthermore, the guide post 300 is electrically connected to the battery cell 200 and the top cover 120, respectively. Specifically, one end of the guide post 200 is welded to the first tab, and the other end is welded to the top cover 120. Therefore, the top cover 120 as a whole can serve as the electrode of the battery cell, specifically the positive electrode. As can be seen, the top cover 120 and the annular rim 112 serve as the positive and negative electrodes of the battery cell 10, respectively. Therefore, the negative and positive electrodes are located on the same side, facilitating electrical connection when the battery cells 10 are grouped.

[0056] Since no additional terminals are required, the risk of liquid and gas leakage is reduced, improving the reliability of the battery cell 10. Furthermore, when the current output from the first tab of the battery cell 200 is transmitted along the guide post 300 to the top cover 120, the transmission path is shorter than when it is transmitted along the housing 110, resulting in lower internal resistance, thereby reducing the positive electrode impedance of the battery cell 10. Furthermore, the placement of the second tab near the top cover 120 shortens the current transmission path compared to conventional arrangements where the second tab is located at the bottom, further reducing the negative electrode impedance of the battery cell 10.

[0057] Please refer to Figure 2 again. In this embodiment, the battery cell 10 also includes a first current collecting plate 500. The first current collecting plate 500 is arranged on the side of the battery cell 200 facing away from the top cover 120 and is welded to the first tab. The end of the guide column 300 away from the top cover 120 is welded to the first current collecting plate 500.

[0058] During assembly of the battery cell 10, the 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 guide post 300 and the first tab, thereby further reducing the positive electrode impedance. 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 guide post 300, this effectively prevents the battery cell 200 from deforming due to gravity.

[0059] In this embodiment, the battery cell 10 further includes a second current collecting tray 600, which is disposed on the side of the battery cell 200 facing the top cover 120 and welded to the second electrode tab. The edge of the second current collecting tray 600 is welded to the inner wall of the housing 110. 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 increases the contact area between the housing 110 and the second electrode tab and shortens the current transmission path, thereby further reducing the negative electrode impedance.

[0060] 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 top cover 120 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.

[0061] Furthermore, referring again to Figures 3 and 4 , the guide post 310 includes a telescopic section 310 that can extend and retract axially, thereby adjusting the axial dimension of the guide post 300. 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 top cover 120 is similar to a floating connection.

[0062] The guide post 300 adapts to the axial compression of the housing assembly 100 during roll-slot sealing through its own elastic compression, preventing tearing at the connection between the guide post 300 and the top cover 120 and further improving the reliability of the battery cell 10. Furthermore, the high electrical conductivity of the guide post 300 overcomes the increased positive electrode impedance associated with direct tab connection to the top cover 120 in conventional layouts.

[0063] Based on this, the guide column 300 can adapt to the pressing process that will bring axial compression in the roller groove sealing process, while having the advantages of good sealing performance of the roller groove sealing process and overcoming the disadvantage of high impedance of the process.

[0064] Furthermore, in actual use, vibration is inevitable, potentially causing 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, reducing strain on the weld between the top cover 120 and the guide post 300. This prevents the weld between the top cover 120 and the guide post 300 from loosening, further improving the reliability of the battery cell 10.

[0065] In this embodiment, the telescopic section 310 can be elastically deformed along the axial direction of the guide column 300 to adjust the axial dimension of the guide column 300 .

[0066] 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 top cover 120. 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 electrode of the battery cell 200.

[0067] 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.

[0068] Furthermore, in this embodiment, the telescopic section 310 includes a plurality of elastic connecting pieces 311 arranged at intervals along the circumference of 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.

[0069] 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.

[0070] It should be noted that, in other embodiments, the telescopic section 310 may be obtained by replacing the material of a partial area of ​​the guide column 300 with an elastic material, or the telescopic section 310 may be configured in the form of a bellows.

[0071] 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.

[0072] Obviously, the elastic connecting piece 311 can be in various shapes as long as it can be stretched and bent along the axial direction of the guide column 300 .

[0073] 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.

[0074] Please refer to Figures 2 and 3 again. In this embodiment, the guide column 300 has an axially extending guide channel 301 formed inside, which is connected to the liquid injection hole. The guide column 300 is provided with an air guide hole 302 and a liquid guide hole 303 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. In other words, the liquid guide hole 303 is farther from the liquid injection hole than the air guide hole 302. In actual use scenarios, the liquid guide hole 303 is located below the air guide hole 302.

[0075] During injection, the electrolyte is injected into the flow channel 301 through the injection hole. 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 into the battery cell from bottom to top.

[0076] The electrolyte entering the shell 110 can squeeze out the air remaining in the shell 110 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. 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, 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 to diffuse, and the injection operation can be carried out continuously, thereby improving the injection efficiency.

[0077] Moreover, when the liquid level of the electrolyte in the shell 110 is flush with the air holes 302 , the electrolyte in the flow channel 301 can also enter the shell 110 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.

[0078] 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 guide channel 301 penetrates the guide column 300 axially, so that the guide column 300 has a hollow structure with openings at both ends. The flow column 300 penetrates the battery cell 200, and the opening at one end is connected to the liquid injection hole, and the opening at the other end constitutes the liquid guide hole 303. On the one hand, the guide column 300 is longer and can provide 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, that is, the liquid guide hole 303, and then flow out of the liquid guide hole 303 and infiltrate the battery cell 200. It can be seen that the injected electrolyte will first flow to the farthest end (the bottom of the battery cell 200) and gradually discharge the residual air in the shell 110 from far to near, so as to achieve better exhaust and infiltration effects.

[0079] Specifically, in this embodiment, 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.

[0080] The battery cell 10 and the top cover 120 can be connected to the housing 110 via roller groove sealing. Since the telescopic section 310 of the guide post 300 can be axially extended and retracted, the guide post 300 can automatically adjust its length according to the degree of axial compression of the housing assembly 100 during the sealing process, thereby preventing tearing at the connection between the guide post 300 and the top cover 120. Furthermore, since the top cover 120 is electrically connected to the battery cell 200 via the guide post 300, the top cover 120 can serve as the entire electrode of the battery cell 10, eliminating the need for separate terminals. This reduces the risk of liquid and gas leakage and improves the reliability of the battery cell 10. Furthermore, when the current output from the battery cell 200 is transmitted along the guide post 300 to the top cover, the transmission path is shorter than when it is transmitted along the housing 110, resulting in lower internal resistance. Therefore, the battery cell 10 described above has both high reliability and low impedance.

[0081] 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.

[0082] 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: The housing assembly comprises a housing with an opening at one end and a top cover, wherein the top cover is sealed at the opening and insulated from the housing; A battery cell, housed in the housing; A guide column is axially arranged in the battery core and is respectively conductively connected to the battery core and the top cover, and the guide column includes a telescopic section that can be telescoped along the axial direction; Wherein, when the outer shell component is axially compressed under the action of external force to form a packaging structure for packaging the top cover, the telescopic section can be compressed along with the movement of the top cover.

2. The battery cell according to claim 1, characterized in that: The battery cell has a central hole, a first pole ear is provided on the side of the battery cell facing away from the top cover, a second pole ear is provided on the side facing the top cover, the second pole ear is electrically connected to the shell, and the guide column is provided in the central hole and electrically connected to the first pole ear.

3. The battery cell according to claim 1, characterized in that: The packaging structure includes a roller groove and an annular edging, wherein the roller groove is formed on the outer peripheral wall of the shell near one end of the opening, the annular edging is formed on the opening edge of the shell, and the top cover is limited between the roller groove and the annular edging.

4. The battery cell according to claim 3, characterized in that: The housing assembly also includes a ring-shaped insulating sleeve, which covers the edge of the top cover.

5. The battery cell according to claim 2, characterized in that: The first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

6. The battery cell according to claim 5, characterized in that: The battery cell further includes a first current collecting plate, which is disposed on a side of the battery cell facing away from the top cover and is welded to the first electrode tab, and one end of the guide column away from the top cover is welded to the first current collecting plate.

7. The battery cell according to claim 6, characterized in that: The battery cell also includes a second current collecting plate, which is arranged on a side of the battery cell facing the top cover and welded to the second pole ear, an 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.

8. The battery cell according to claim 7, characterized in that: The battery cell further comprises an insulating gasket, which is sleeved on the guide column and pressed on a side of the battery cell facing the top cover.

9. The battery cell according to claim 1, characterized in that: The telescopic section can be elastically deformed along the axial direction of the guide column.

10. The battery cell according to claim 9, characterized in that: The telescopic section includes a plurality of elastic connecting pieces spaced apart along the circumference of the guide column, and each of the elastic connecting pieces can be stretched and bent along the axial direction of the guide column.

11. The battery cell according to claim 10, 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.

12. The battery cell according to claim 10, 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.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The top cover is provided with a liquid injection hole, and a guide channel extending axially is formed inside the guide column, and the guide channel is connected 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, and 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.

14. A battery, characterized in that: The battery comprises a plurality of battery cells as claimed in any one of claims 1 to 13.

15. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 13 or a battery as claimed in claim 14.

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