Battery cell and electric device

Abstract

This application discloses a battery cell and an electrical device, belonging to the field of battery technology. The battery cell includes an electrode assembly, which includes a first electrode, a second electrode, a separator, and a support. The first electrode, the second electrode, and the separator are all wound around the outer periphery of the support. The support includes a support body and an insert. The support body has an inner cavity and a notch on one side, extending from a first end to a second end. The insert is connected to the support body and extends into the notch. The inner cavity is used to accommodate a winding needle, which drives the support body to rotate synchronously. The support body and the insert are used to clamp the separator. The separator is wound by applying frictional force to it through the support body and the insert, eliminating the need for heat sealing or adhesive bonding to pre-wrap the separator. This avoids the wrinkling problems of the separator or electrode caused by heat sealing or adhesive bonding, improving the structural stability of the electrode assembly.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery cell and an electrical device. Background Technology

[0002] Currently, cylindrical cells are typically processed using center pin winding technology. The center pin is usually wound up using a hot-stamping method to start the winding of the separator. This hot-stamping method is affected by the coating of the separator, making it difficult to heat the upper and lower separators together. This results in difficulty in winding, poor heat-stamping effect, and problems such as wrinkling of the separator and electrode sheets. Summary of the Invention

[0003] This application aims to provide a battery cell and an electrical device that at least solves the problems of difficulty in rolling up the separator, poor heat treatment effect, and easy wrinkling of the separator and electrode sheets.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] In a first aspect, embodiments of this application propose a battery cell, which includes an electrode assembly comprising a first electrode, a second electrode, a separator, and a support. The first electrode, the second electrode, and the separator are all wound around the outer periphery of the support, with one end of the separator embedded in the support. The support includes a support body and an insert. The support body has an inner cavity and a notch on one side, extending from a first end to a second end. The insert is connected to the support body and extends into the notch. The inner cavity accommodates a winding needle, which drives the support body to rotate synchronously. The support body and the insert clamp the separator.

[0006] The separator is rolled up by applying frictional force to the supporting body and inserts, thus eliminating the need for heat sealing or adhesive bonding to pre-roll the separator. This embodiment offers a simple and efficient method for rolling the separator, avoiding wrinkling issues caused by heat sealing and adhesive bonding, which improves the structural stability of the electrode assembly and reduces its damage rate.

[0007] In one possible technical solution, the gap extends along the length of the supporting body.

[0008] In this embodiment, the notch has a long cross-section. Since the end of the spacer is usually long, the extension direction of the notch is basically the same as the extension direction of the end of the spacer. When the insert and the support body clamp the spacer, the spacer is less likely to wrinkle, thus reducing the damage rate of the spacer during the winding process.

[0009] In one possible technical solution, the surface of the supporting body away from the inner cavity is flush with the inlay.

[0010] In this embodiment, the outer surfaces of the insert and the support body are flush, so that there is a smooth transition between the insert and the support body. When the spacer passes through the transition position between the insert and the support body, the spacer can smoothly pass through the transition position between the insert and the support body, which improves the stability of the spacer during the winding process and further reduces the damage rate of the spacer.

[0011] In one possible technical solution, the battery cell further includes a support rib, which is located in the inner cavity and is used to support the insert.

[0012] Because the support body has a hollow internal structure, the insert may move into the cavity when subjected to external force. In this embodiment, the insert is supported by support ribs, making it less likely for the insert to move into the cavity, and the insert can stably support the inner wall of the central hole.

[0013] In one possible technical solution, the support ribs are used to restrict the movement of the insert along the length of the battery cell.

[0014] The support rib can not only support the insert, but also limit its position. The support rib achieves multiple functions in one piece. When it is necessary to support and limit the insert, the above functions can be achieved by a single component, which helps to simplify the product structure.

[0015] In one possible technical solution, there are multiple support ribs, with adjacent support ribs spaced apart along the length of the battery cell. The insert has multiple grooves, each corresponding to a support rib, and the grooves and support ribs are interlocked.

[0016] When the insert is in contact with the support rib, the groove on the insert and the support rib interlock, that is, the support rib is inserted into the groove. At this time, the position on the insert without a groove is located between two adjacent support ribs. The support rib can limit the position on the insert without a groove, preventing the insert from moving along the length of the battery cell, which helps to improve the installation stability of the insert.

[0017] In one possible technical solution, the insert includes a clamping part and a limiting part. The clamping part is located inside the notch, and the limiting part is connected to the clamping part. The limiting part extends into the inner cavity and abuts against the cavity wall of the inner cavity.

[0018] The limiting part extends into the inner cavity and contacts the cavity wall. At this time, the cavity wall of the inner cavity acts as a limiting part, preventing the insert from moving to the outside of the inner cavity, thus making the insert stably connected to the support body.

[0019] In one possible technical solution, the connection method between the insert and the support body includes any of the following: snap-fit ​​connection, threaded connection, key connection, pin connection, riveting, welding, and bonding.

[0020] In one possible technical solution, the length of the support body is L1, the length of the electrode assembly is L2, and 0.7×L2≤L1≤L2.

[0021] In one possible technical solution, the support body includes a metal support body, or the support body includes a thermoplastic support body.

[0022] In one possible technical solution, the first side of the insert and the second side of the notch clamp the separator, and the first side and the second side have the same shape.

[0023] The first and second sides have the same shape. When the first and second sides clamp the spacer, the distance between each part of the first and second sides is equal, which helps to improve the clamping stability of the first and second sides on the spacer.

[0024] Secondly, this application provides an electrical device that includes the above-mentioned battery cells.

[0025] Thirdly, this application provides a winding device for winding the electrode assembly in any of the above-mentioned battery cells. The winding device includes a winding needle and a driving assembly. The winding needle is inserted into the inner cavity of the support body and is used to drive the support body to rotate synchronously. The driving assembly is used to drive the winding needle to rotate.

[0026] In one possible technical solution, along the radial direction of the support body, the cavity wall of the inner cavity and the cross-section of the coiling needle are both polygonal structures, and the shape of the cavity wall and the coiling needle are adapted to each other.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is one of the structural schematic diagrams of the support member according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the support body according to an embodiment of the present invention;

[0031] Figure 3 This is a second structural schematic diagram of the support member according to an embodiment of the present invention;

[0032] Figure 4 This is one of the structural schematic diagrams of the inlay according to an embodiment of the present invention;

[0033] Figure 5 This is the third structural schematic diagram of the support member according to an embodiment of the present invention;

[0034] Figure 6 This is a second schematic diagram of the structure of the inlay according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of the inlay according to an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of the structure of the electrode assembly and support member according to an embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present invention;

[0039] Figure 11 This is a schematic diagram of the structure of a winding device according to an embodiment of the present invention.

[0040] Figure label:

[0041] 10 Battery cell, 100 Support component, 110 Support body, 111 Notch, 112 Inner cavity, 113 Second side surface, 120 Inlay, 122 Clamping part, 123 Limiting part, 124 First side surface, 130 Support rib, 131 Groove, 210 Electrode assembly, 211 Center hole, 213 Separator, 214 First electrode, 215 Second electrode, 220 Housing, 230 End cap, 300 Electrical equipment, 400 Winding equipment, 410 Winding needle, 420 Drive assembly. Detailed Implementation

[0042] Embodiments of the present invention will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0043] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0044] 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 are not intended to 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.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] The following is combined with Figures 1-11 A battery cell and an electrical device according to embodiments of the present invention are described.

[0047] In battery production, the winding of battery cell components is a crucial step. Battery cell components are typically formed by winding an anode sheet, a separator, a cathode sheet, and another separator using a winding machine. For cylindrical battery products, which offer advantages such as high density, high safety, and long lifespan, the cyclic expansion force of the cell is significant, posing a risk of collapse to the center hole of the inner ring. Therefore, a center pin is needed within the cell's inner hole for support.

[0048] In related technologies, the center pin is generally rolled up by hot stamping. This hot stamping method is slow and inefficient. Furthermore, the hot stamping is affected by the coating of the separator, making it difficult to heat the upper and lower separators together. This results in difficulty in rolling, poor hot stamping effect, and easy wrinkling of the separator and electrode.

[0049] Based on the above considerations, in order to reduce the difficulty of unwinding the separator and prevent the separator and electrode from wrinkling, this application proposes a battery cell in which the supporting body and the insert can clamp the separator. The supporting body and the insert clamp the separator by friction, thereby completing the unwinding and prewinding of the separator. This method does not rely on heat treatment or adhesive bonding to complete the prewinding of the separator. The unwinding method is simple and efficient, and avoids the problem of separator wrinkling.

[0050] It is understood that the electrical devices applicable to the use of battery cells described in the embodiments of this application can take many forms, such as mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, 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, and 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.

[0051] Combination Figure 10 and Figure 11 As shown, the battery cell 10 described in the embodiments of this application is not only applicable to the electrical device 300 described above, but also applicable to all electrical devices 300 that use the battery cell 10.

[0052] In some embodiments of this application, the battery can be used to power the vehicle; for example, the battery can serve as the vehicle's operating power source. The controller is used to control the battery's power supply to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving.

[0053] In other embodiments, the battery can serve not only as the operating power source for the vehicle, but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0054] In this application, the battery mentioned in the embodiments refers to a single physical module comprising one or more battery cells 10 to provide higher voltage and capacity. For example, a battery is composed of multiple battery cells 10 connected in series or in parallel.

[0055] Combination Figure 3 , Figure 5 and Figure 8 As shown, the battery cell 10 includes an electrode assembly 210. The first electrode 214, the second electrode 215 and the separator 213 in the electrode assembly 210 are wound to form a bare cell. The bare cell has a central hole 211 and a support member 100 is disposed in the central hole 211.

[0056] Combination Figure 1 and Figure 11 As shown, the winding device 400 includes a drive assembly 420 and a winding needle 410. The drive assembly 420 is used to drive the winding needle 410 to rotate. The support member 100 is sleeved on the winding needle 410. The winding needle 410 drives the support member 100 to wind the first electrode 214, the second electrode 215 and the separator 213 to form a bare cell.

[0057] The winding needle 410 is inserted into the inner cavity 112 of the support body 110. The winding needle 410 can be driven by the drive component 420 to drive the support member 100 to rotate synchronously, so that the separator 213 and the electrode sheet are wound around the outer ring surface of the support member 100. After the bare cell is prepared, the winding needle 410 is removed, so that the support member 100 remains in the center hole 211 of the bare cell. The support member 100 can support the center hole 211 to improve the problem of the center hole 211 collapse, which is conducive to improving the quality and service life of the electrode assembly 210, thereby improving the quality and service life of the battery cell 10. Furthermore, by setting the support member 100 in the center hole 211 in this way, the operation is convenient and it is conducive to realizing automated design.

[0058] The support member 100 provided in this application embodiment can be produced and sold separately as an independent component. Of course, the support member 100 can also be used in the winding equipment 400 and serve as a component of the winding equipment 400, which is beneficial to improving the quality and service life of the electrode assembly 210 wound by the winding equipment 400 and also facilitates automated design. In addition, it can also be used in the battery cell 10 and serve as a component of the battery cell 10, which is beneficial to improving the quality and service life of the battery cell 10.

[0059] For example, the drive assembly 420 includes a drive motor and a transmission shaft. The drive motor drives the transmission shaft to rotate, and the transmission shaft drives the winding needle 410 to rotate. The drive motor and the transmission shaft can be connected by means of gear transmission, belt transmission or chain transmission, etc. Of course, the structure of the drive assembly 420 is not limited to the above structure, as long as it can realize the function of rotating the winding needle 410.

[0060] The winding device 400 also includes an extraction component, wherein the winding needle 410 is detachably connected to the support member 100 and the extraction component can extract the winding needle 410 from the support member 100. For example, the extraction component can be a cylinder that drives the winding needle 410 to extend out of the support member 100.

[0061] Along the radial direction of support 100 ( Figure 1 (The arrow at R in the middle points to) The cavity wall of the inner cavity 112 and the cross-section of the coil needle 410 are both polygonal structures, and the shapes of the cavity wall of the inner cavity 112 and the coil needle 410 are adapted to each other.

[0062] The coiled needle 410 and the support member 100 are cut radially. Both the cross-sectional shape of the coiled needle 410 and the cross-sectional shape of the cavity wall of the inner cavity 112 are polygonal structures. Furthermore, the cross-sectional shapes of the coiled needle 410 and the cavity wall of the inner cavity 112 are compatible. Here, "compatible shapes" means that the cross-sectional shapes of the coiled needle 410 and the cavity wall of the inner cavity 112 are the same. For example, the cross-sectional shape of the coiled needle 410 is hexagonal, and the cross-sectional shape of the cavity wall of the inner cavity 112 is also hexagonal; or, the cross-sectional shape of the coiled needle 410 is elliptical, and the cross-sectional shape of the cavity wall of the inner cavity 112 is also elliptical. Of course, the cross-sectional shapes of the coiled needle 410 and the cavity wall of the inner cavity 112 are not limited to the examples above. Because their cross-sectional shapes are the same, the coiled needle 410 can be smoothly inserted into the inner cavity 112.

[0063] When the needle coil 410 is rotating, the needle coil 410 can drive the support member 100 to rotate by its own structural shape, without the need for a connecting structure between the needle coil 410 and the support member 100, which simplifies the structure. Moreover, the absence of a connecting structure between the needle coil 410 and the support member 100 also makes it easy to pull the needle coil 410 out of the inner cavity 112.

[0064] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to some embodiments of this application, the battery cell 10 includes an electrode assembly 210, which includes a first electrode 214, a second electrode 215, a separator 213, and a support member 100. The first electrode 214, the second electrode 215, and the separator 213 are all wound around the outer periphery of the support member 100, and one end of the separator 213 is embedded in the support member 100. The support member 100 includes a support body 110 and an insert 120. The support body 110 has an inner cavity 112 and a notch 111 on one side, which extends from the first end of the support body 110 to the second end. The insert 120 is connected to the support body 110 and extends into the notch 111. The inner cavity 112 is used to accommodate a winding needle 410, which drives the support body 110 to rotate synchronously. The support body 110 and the insert 120 are used to clamp the separator 213.

[0065] The support body 110 has a hollow structure and an inner cavity 112 is provided inside the support body 110. A winding needle 410 can be inserted into the inner cavity 112. The winding needle 410 drives the support member 100 to rotate, so that the support member 100 can realize the winding function of the separator 213 and the electrode under the drive of the winding needle 410.

[0066] A notch 111 is provided on one side of the support body 110, and at least a portion of the insert 120 can be installed into the notch 111. The notch 111 extends from the first end of the support body 110 to the second end of the support body 110, so the insert 120 can also extend from the first end of the support body 110 to the second end of the support body 110. A clamping gap is formed between the support body 110 and the insert 120, and the end of the spacer 213 can extend into the clamping gap.

[0067] When the separator 213 needs to be wound, its end is inserted between the support body 110 and the insert 120, allowing the support body 110 and the insert 120 to clamp the separator 213. During unwinding, the separator 213 is driven to rotate mainly by the friction between itself and the support body 110 and the insert 120, as well as by the friction between itself and the outer surface of the support body 110. During this process, the separator 213 does not need to be fixed to the support 100 by heat treatment, bonding, or other methods. The clamping of the separator 213 by the support body 110 and the insert 120 ensures a stable unwinding process. After prewinding, the electrode sheet can be inserted between two adjacent separators 213, relying on the friction generated by the separator 213 on the electrode sheet to drive the electrode sheet to complete subsequent winding until the bare cell is wound.

[0068] The spacer 213 is rolled up by applying frictional force to the support body 110 and the insert 120. This allows the spacer 213 to be rolled up and pre-rolled primarily by friction with the support body 110 and the insert 120, eliminating the need for heat sealing or adhesive bonding. This method of rolling up the spacer 213 is simple and efficient, avoiding wrinkling of the spacer 213 and the electrode sheet caused by heat sealing and adhesive bonding. This improves the structural stability of the electrode assembly 210 and reduces its damage rate.

[0069] The battery cell 10 also includes a housing 220 and an end cap 230. The electrode assembly 210 is located inside the housing 220, and the end cap 230 is provided on the opening of the housing 220.

[0070] like Figure 2 As shown, in one possible embodiment, the notch 111 is along the length direction of the support body 110 ( Figure 1 The arrow at point L points to the extension.

[0071] The notch 111 is opened on the side of the support body 110. The support body 110 has the notch 111 opened along its own length direction. Therefore, the extension direction of the notch 111 is set in the same direction as the length direction of the support body 110.

[0072] In this embodiment, the cross-section of the notch 111 is elongated. Since the end of the spacer 213 is usually elongated, the extension direction of the notch 111 is basically the same as the extension direction of the end of the spacer 213. When the insert 120 and the support body 110 clamp the spacer 213, the spacer 213 is less likely to wrinkle, thus reducing the damage rate of the spacer 213 during the winding process.

[0073] In other embodiments, the notch 111 from the first end of the support body 110 to the second end of the support body 110 may also be arc-shaped or wavy.

[0074] Combination Figure 1 , Figure 3 and Figure 5 As shown, in one possible embodiment, the surface of the support body 110 facing away from the inner cavity 112 is flush with the insert 120.

[0075] After the insert 120 is installed into the notch 111 of the support body 110, the outer surface of the insert 120 is flush with the outer surface of the support body 110. That is, the insert 120 does not protrude from the outer surface of the support body 110. During the winding of the spacer 213, the insert 120 will not push the spacer 213 up from the support body 110.

[0076] Since the outer surfaces of the insert 120 and the support body 110 are flush, it means that the insert 120 is not recessed relative to the support body 110. During the winding process of the spacer 213, when the spacer 213 passes the insert 120, the spacer 213 will not sink into the support body 110.

[0077] In this embodiment, the outer surfaces of the insert 120 and the support body 110 are flush, so that there is a smooth transition between the insert 120 and the support body 110. When the isolation member 213 passes through the transition position between the insert 120 and the support body 110, the isolation member 213 can smoothly pass through the transition position between the insert 120 and the support body 110, which improves the stability of the isolation member 213 during the winding process and further reduces the damage rate of the isolation member 213.

[0078] For example, when the outer surface of the support body 110 is curved, the surface of the insert 120 used to support the spacer 213 is also curved, and the curvature of the curved surface of the support body 110 and the curved surface of the insert 120 are the same.

[0079] Combination Figure 2 , Figure 3 , Figure 5 and Figure 7As shown, in one possible embodiment, the battery cell 10 further includes a support rib 130, which is located in the inner cavity 112 and is used to support the insert 120.

[0080] A support rib 130 is provided in the inner cavity 112. When the insert 120 is installed into the notch 111, the insert 120 contacts the support rib 130. At this time, the support rib 130 supports the insert 120.

[0081] During the winding process of the separator 213 and the electrode, the separator 213 and the electrode pass through the insert 120. The insert 120 needs to support the separator 213 and the electrode; that is, after the bare cell is wound, the insert 120 needs to support a portion of the central hole 211 to prevent local collapse of the central hole 211. Since the support body 110 has a hollow structure, the insert 120 may move into the inner cavity 112 under external force. In this embodiment, the insert 120 is supported by the support rib 130, making it less likely for the insert 120 to move into the inner cavity 112, and the insert 120 can stably support the inner wall of the central hole 211.

[0082] Furthermore, when the insert 120 is installed in place, the insert 120 contacts the support rib 130. At this time, the support rib 130 restricts the insert 120 from moving further into the inner cavity 112. This is equivalent to the support rib 130 positioning the insert 120. When the insert 120 contacts the support rib 130, it means that the insert 120 has been installed in place and there is no need to move the insert 120 further into the inner cavity 112. At this time, the insert 120 is flush with the outer surface of the support body 110. Installing the insert 120 in the above manner helps to reduce the difficulty of installing the insert 120.

[0083] Of course, in other embodiments, it is not necessary to provide support ribs 130 in the inner cavity 112. Instead, rib structures are provided on the inner wall of the notch 111 to support and position the insert 120.

[0084] In one possible embodiment, the support rib 130 is used to restrict the movement of the insert 120 along the length direction of the battery cell 10.

[0085] When the insert 120 is installed into the notch 111, the insert 120 contacts the support rib 130. The structures of the insert 120 and the support rib 130 cooperate with each other. At this time, the support rib 130 plays a limiting role for the insert 120. Under the limiting role of the support rib 130, the insert 120 will not move along the length direction of the battery cell 10, thus preventing the insert 120 from detaching from the support body 110 and improving the installation stability of the insert 120.

[0086] The support rib 130 can not only support the insert 120, but also limit its position. The support rib 130 achieves multiple functions. When it is necessary to support and limit the insert 120, the above functions can be achieved by only one component, which helps to simplify the product structure.

[0087] Of course, in other embodiments, the support rib 130 may be configured to only support the insert 120, and the support rib 130 may not need to limit the insert 120. Instead, other structures may be used to limit the insert 120 or adhesive may be used to restrict the insert 120 from detaching from the support body 110.

[0088] Combination Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, in one possible embodiment, there are multiple support ribs 130, and two adjacent support ribs 130 are spaced apart along the length direction of the battery cell 10. The insert 120 is provided with multiple grooves 131, and the multiple grooves 131 correspond one-to-one with the multiple support ribs 130. The grooves 131 and the support ribs 130 are interlocked with each other.

[0089] Multiple support ribs 130 are provided in the inner cavity 112. Adjacent support ribs 130 are spaced apart along the length of the battery cell 10, thus creating a gap between adjacent support ribs 130. Multiple grooves 131 are machined on the insert 120. Adjacent grooves 131 are spaced apart along the length of the battery cell 10. The number of grooves 131 is equal to the number of support ribs 130, and the positions of the grooves 131 correspond to the positions of the support ribs 130.

[0090] When the insert 120 is in contact with the support rib 130, the groove 131 on the insert 120 and the support rib 130 are interlocked, that is, the support rib 130 is inserted into the groove 131. At this time, the position on the insert 120 without the groove 131 is located between two adjacent support ribs 130. At this time, the support rib 130 can limit the position on the insert 120 without the groove 131, preventing the insert 120 from moving along the length direction of the battery cell 10, which is beneficial to improving the installation stability of the insert 120.

[0091] In this embodiment, as Figure 2 As shown, the number of support ribs 130 is 3 (in other embodiments, the number of support ribs 130 is not limited to 3), as... Figure 7 As shown, the number of grooves 131 on the insert 120 is also 3, that is, the number of grooves 131 is the same as the number of support ribs 130. After the insert 120 is installed, the position of the grooves 131 corresponds to the position of the support ribs 130, and the support ribs 130 support the position of the grooves 131 on the insert 120.

[0092] In other embodiments, the support rib 130 can be a long strip structure, with one of a protrusion and a recess provided on the support rib 130, and the other of a protrusion and a recess provided on the insert 120. When the protrusion is inserted into the recess, the support rib 130 can also perform the function of limiting the insert 120.

[0093] Combination Figure 3 and Figure 4 As shown, in one possible embodiment, the insert 120 includes a clamping portion 122 and a limiting portion 123. The clamping portion 122 is located inside the notch 111, and the limiting portion 123 is connected to the clamping portion 122. The limiting portion 123 extends into the inner cavity 112 and abuts against the cavity wall of the inner cavity 112.

[0094] The two structural parts of the insert 120 are named clamping part 122 and limiting part 123, respectively. When the insert 120 is installed in place, the clamping part 122 is located in the notch 111, and the clamping part 122 and the support body 110 can clamp the spacer 213. The limiting part 123 extends into the inner cavity 112 and contacts the cavity wall of the inner cavity 112. At this time, the cavity wall of the inner cavity 112 limits the limiting part 123, and the insert 120 cannot move to the outside of the inner cavity 112, thereby making the insert 120 stably connected to the support body 110.

[0095] The insert 120 can be made of a relatively soft material. When force is applied to the insert 120, the insert 120 can deform, thereby embedding the insert 120 into the support body 110 or separating the insert 120 from the support body 110.

[0096] In one possible embodiment, the connection between the insert 120 and the support body 110 includes any of the following: snap-fit ​​connection, threaded connection, key connection, pin connection, riveting, welding, and bonding.

[0097] Threaded structures can be provided on the insert 120 and the support body 110 respectively, and the two can be screwed together by the threaded structures.

[0098] Alternatively, the insert 120 can be fixed to the support body 110 using components such as keys, pins, and rivets.

[0099] Alternatively, if the outer surfaces of the insert 120 and the support body 110 are flush, the mounting position of the insert 120 can be fixed by welding or bonding.

[0100] Combination Figure 1 and Figure 9 As shown, in one possible embodiment, the length of the support body 110 is L1, the length of the electrode assembly 210 is L2, and 0.7×L2≤L1≤L2.

[0101] The length of the support body 110 is 70% to 100% of the length of the electrode assembly 210, that is, the length of the support body 110 is at least 70% of the length of the electrode assembly 210.

[0102] By increasing the length of the supporting body 110, the length of the supported position inside the central hole 211 can be increased, so that most of the inner wall inside the central hole 211 is supported by the supporting body 110, effectively preventing the central hole 211 from collapsing.

[0103] In one possible embodiment, the support body 110 includes a metal support body, or the support body 110 includes a thermoplastic support body.

[0104] The support body 110 can be made of metal, which helps to improve the hardness of the support body 110 and thus improve the support effect on the central hole 211.

[0105] Alternatively, the support body 110 can also be made of thermoplastic non-metallic materials, specifically materials resistant to electrolytes to prevent corrosion of the support body 110 by the electrolyte. For example, the support body 110 can be made of electrolyte-resistant insulating materials such as polypropylene or polyethylene, so that the support body 110 is not corroded by the electrolyte.

[0106] Combination Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, in one possible embodiment, the first side 124 of the insert 120 and the second side 113 of the notch 111 clamp the separator 213, and the first side 124 and the second side 113 have the same shape.

[0107] The first side 124 of the insert 120 faces the second side 113 of the notch 111. The first side 124 and the second side 113 are arranged opposite each other. When the spacer 213 extends between the insert 120 and the support body 110, the first side 124 and the second side 113 clamp the spacer 213. The first side 124 and the second side 113 restrict the spacer 213 from disengaging from the support 100 by friction.

[0108] The first side 124 and the second side 113 have the same shape. When the first side 124 and the second side 113 clamp the spacer 213, the distance between each part of the first side 124 and the second side 113 is equal, which helps to improve the clamping stability of the first side 124 and the second side 113 on the spacer 213.

[0109] The cylindrical battery cell has a central hole 211. To address the problem of the central hole 211 collapsing due to material expansion during the cycling process, a support member 100 is needed inside the cell. To overcome the technical difficulty of unwinding the support member 100 during manufacturing, this embodiment uses a support body 110 with a notch 111, combined with an insert 120 embedded in an isolation member 213, to fix the isolation member 213 onto the support member 100, thus achieving the unwinding purpose. The support member 100 is placed inside the central hole 211. The support member 100 consists of two parts: the support body 110 is nested on the winding needle 410, and the insert 120 clamps and winds the isolation member 213, fixing the isolation member 213 onto the support member 100 to achieve the unwinding purpose.

[0110] The support member 100 consists of a support body 110 with a notch 111 and an insert 120. The support body 110 and the insert 120 are combined to form a complete columnar support member 100. The winding process is as follows: first, the support body 110 is inserted into the winding needle 410, and the two spacers 213 are placed on one side of the support body 110 where the notch 111 is formed. Then, the insert 120 is used to press the spacers 213 into the notch 111 to achieve a fixed connection between the spacers 213 and the support member 100. Subsequently, the winding needle 410 drives the support member 100 to complete the pre-winding of the spacers 213. Finally, the feeding and winding of the first electrode 214 and the second electrode 215 are completed until the winding of the entire electrode assembly 210 is completed.

[0111] This invention employs a coiling snap-on support member 100, utilizing a support body 110 with a C-shaped notch as the main body and an insert 120 as a component. The insert 120 and the support body 110 are combined. The insert 120 expands the support body 110, and upon reaching a limit position, the support body 110 uses the material's self-elasticity to snap the insert 120 in place, achieving self-locking. After the support body 110 enters the coiling needle 410, the spacer 213 is placed inside the support member 100, pressing the insert 120 into the notch 111. There is a certain gap between the insert 120 and the notch 111, the size of which depends on the thickness of the spacer 213. The insert 120 clamps and fixes the spacer 213, achieving coiling. This solves the problem of large gaps between the traditional rear-inserted center needle and the center hole, and also alleviates the difficulty of coiling the center needle to some extent.

[0112] The support body 110 is designed with at least one notch 111. The support body 110 can cooperate with at least one insert 120 corresponding to the notch 111 to form a complementary structure by utilizing the elastic fitting of the support body 110 or the insert 120.

[0113] The purpose of setting notches 111 in the support body 110 is to allow the isolation member 213 to extend from the notches 111, while the insert 120 can cooperate with the notches 111 to clamp the isolation member 213, thereby forming a complete columnar support member 100 for rolling. The number of notches 111 is greater than or equal to 1.

[0114] The inner cavity 112 is designed with a support rib 130, which is used to provide limiting support for the insert 120 and to strengthen the rigidity of the central pin structure.

[0115] The center pin has a support rib 130 inside, which prevents the insert 120 from slipping and provides better support for the insert 120.

[0116] After the insert 120 is embedded in the support body 110, it forms a mechanical interlock, including but not limited to cam interlock, ratchet interlock, spring interlock, lever interlock, electromagnetic interlock, relay interlock, hydraulic valve interlock and cylinder interlock, etc. The insert 120 will not have problems with axial or radial movement or falling off.

[0117] The support body 110 has an internal mechanical interlocking structure, which enables the insert 120 to be fixed and limited after it is fitted into the support body 110.

[0118] A gap is left between the insert 120 and the support body 110, which can be filled by the spacer 213. The width of the gap is less than the sum of the thicknesses of the two spacers 213, so as to achieve a tight fit and drive the winding. The friction force applied by the insert 120 and the support body 110 to the spacer 213 is greater than the winding tension of the spacer 213.

[0119] The length of the support member 100 is 70% to 100% of the height of the electrode assembly 210, and the diameter is 1 mm to 50 mm, which improves the support strength of the electrode assembly 210. The diameter of the support member 100 is set according to the diameter of the bare battery cell.

[0120] The support component 100 can be made of metal or non-metal materials, with priority given to electrolyte-resistant insulating materials such as polypropylene and polyethylene, so that the support component 100 is not corroded by electrolyte.

[0121] The isolation component 213 can be fixed to the support component 100 by the support component 100 itself, without the need for fixing by heat or adhesive. This avoids damage to the structure of the isolation component 213 by heat or adhesive, resulting in a good fixing effect, improved production efficiency, good stability, and reduced safety risks to the battery cell while ensuring the integrity of the isolation component 213.

[0122] The cross-section of the insert 120 can be composed of arcs, straight lines or curves, etc. The insert 120 and the support 100 have structural diversity and can be processed according to different application scenarios.

[0123] The fitting methods of the insert 120 include, but are not limited to, snap-fit, spiral, key connection, pin connection, rivet connection, welding, and bonding. Different methods can achieve different technical effects according to different application scenarios.

[0124] The insert 120 mates with the notch 111 to form the support 100. The support body 110 is then fitted onto the winding needle 410. The spacer 213 extends from the notch 111 and is then fixed in place by the insert 120. A gap matching the thickness of the spacer 213 is designed between the insert 120 and the support body 110 to prevent the insert 120 from being unable to fit into the support body 110 due to the excessive thickness of the two spacers 213. The first electrode 214 and the second electrode 215 can be wound up after the spacers 213 are fixed in place.

[0125] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0126] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized by, include: An electrode assembly, comprising a first electrode, a second electrode, an isolator, and a support, wherein the first electrode, the second electrode, and the isolator are all wound around the outer periphery of the support, and one end of the isolator is embedded in the support. The support includes a support body and an insert. The support body has an inner cavity and a notch on one side. The notch extends from a first end to a second end of the support body. The insert is connected to the support body and extends into the notch. The inner cavity is used to accommodate a coiled needle. The coiled needle is used to drive the support body to rotate synchronously. The support body and the insert are used to clamp the isolator. The inlay includes: The clamping part is located within the notch; A limiting part is connected to the clamping part, the limiting part extends into the inner cavity, and the limiting part abuts against the cavity wall of the inner cavity; A clamping gap is formed between the supporting body and the inlay, and the end of the isolation member extends into the clamping gap.

2. The battery cell of claim 1, wherein, The notch extends along the length of the support body.

3. The battery cell of claim 1, wherein, The surface of the support body facing away from the inner cavity is flush with the inlay.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The battery cell also includes: A support rib is located in the inner cavity and is used to support the insert.

5. The battery cell according to claim 4, characterized in that, The support rib is used to restrict the movement of the insert along the length direction of the battery cell.

6. The battery cell according to claim 4, characterized in that, The number of support ribs is multiple, and two adjacent support ribs are spaced apart along the length of the battery cell. The insert is provided with multiple grooves, and each groove corresponds to one of the support ribs. The grooves and support ribs are interlocked.

7. The battery cell according to any one of claims 1 to 3, characterized in that, The connection method between the inlay and the supporting body includes any of the following: Snap-fit ​​connections, threaded connections, keyed connections, pin connections, riveting, welding, and bonding.

8. The battery cell according to any one of claims 1 to 3, characterized in that, The support body includes a metal support body, or the support body includes a thermoplastic support body.

9. The battery cell according to any one of claims 1 to 3, characterized in that, The first side of the inlay and the second side of the notch clamp the spacer, and the first side and the second side have the same shape.

10. The battery cell according to any one of claims 1 to 3, characterized in that, The length of the support body is L1, and the length of the electrode assembly is L2, where 0.7 × L2 ≤ L1 ≤ L2.

11. An electrical appliance, characterized in that, include: The battery cell as described in any one of claims 1 to 10.

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