Battery cell and electric device

Abstract

The application discloses a battery monomer and an electric device, and belongs to the technical field of batteries. The battery monomer comprises an electric core and a supporting piece. The electric core has a center hole, and the supporting piece is located in the center hole. The supporting piece comprises a first supporting part and a second supporting part. In the radial direction of the electric core, the cross-sectional area of the first end of the first supporting part is smaller than that of the second end, and the cross-sectional area of the first end of the second supporting part is smaller than that of the second end. The first end of the first supporting part is inserted into the center hole from the first side of the electric core, and the first end of the second supporting part is inserted into the center hole from the second side of the electric core. The first supporting part is provided with a first inclined surface, the second supporting part is provided with a second inclined surface, an electric core diaphragm is arranged in the center hole, and the first inclined surface and the second inclined surface clamp the electric core diaphragm. The end with a smaller cross-sectional area of the first supporting part and the second supporting part is inserted into the center hole first, the first supporting part and the second supporting part are not easy to scratch and damage the electric core, and the supporting piece formed by the first supporting part and the second supporting part can effectively support the center hole.

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] Current cylindrical battery cell designs have a central hole. To address the issue of the central hole collapsing due to material expansion during cycling, a central pin is needed inside the central hole as a support. However, to reduce the gap between the central hole wall and the central pin, the radial dimension of the central pin needs to be increased, which makes it more difficult to insert the central pin into the central hole. Summary of the Invention

[0003] This application aims to provide a battery cell and an electrical device that at least solves the problem of the difficulty in inserting the center pin into the center hole in the related art.

[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, comprising: a battery cell and a support member. The battery cell has a central hole, and the support member is located within the central hole. The support member includes a first support portion and a second support portion. Along the radial direction of the battery cell, the cross-sectional area of ​​the first end of the first support portion is smaller than the cross-sectional area of ​​the second end of the first support portion, and the cross-sectional area of ​​the first end of the second support portion is smaller than the cross-sectional area of ​​the second end of the second support portion. The first end of the first support portion is inserted into the central hole from a first side of the battery cell, and the first end of the second support portion is inserted into the central hole from a second side of the battery cell. The first support portion is provided with a first inclined surface, the second support portion is provided with a second inclined surface, and a battery cell separator is disposed within the central hole, with the first and second inclined surfaces clamping the battery cell separator.

[0006] The first support portion has a relatively small cross-sectional area at its first end and a relatively large cross-sectional area at its second end. Therefore, the first support portion has a structure with a large cross-sectional area at one end and a small cross-sectional area at the other. When inserting the first support portion into the center hole, the first end of the first support portion is inserted first, as its relatively small size makes insertion easier. Similarly, the second support portion has a relatively small cross-sectional area at its first end and a relatively large cross-sectional area at its second end. Similarly, when inserting the second support portion into the center hole, the first end of the second support portion is inserted first, as its relatively small size makes insertion easier. By inserting the smaller cross-sectional areas of the first and second support portions into the center hole first, the first and second support portions are less likely to scratch the battery cell. Furthermore, the support structure formed after the first and second support portions are installed can effectively support the center hole. This method effectively improves the ease of installation of the support structure.

[0007] A cell separator is provided on the inner wall of the central hole. In this embodiment, after the support is installed, since the support is a split structure, the cell separator can be clamped by the first and second inclined surfaces. In this case, it is not necessary to remove the cell separator in the central hole by heat treatment, which saves the step of heat treatment of the cell separator and reduces the damage to the cell, which is beneficial to improving the stability of the cell structure.

[0008] In one possible technical solution, the cross-sectional area of ​​the first support portion increases along the radial direction of the battery cell, from the first end to the second end of the first support portion. Similarly, the cross-sectional area of ​​the second support portion increases along the radial direction of the battery cell, from the first end to the second end of the second support portion.

[0009] The thinner part of the first support corresponds to the thicker part of the second support, and vice versa. The support member composed of the first and second support parts has a small difference in thickness at various points, which enables the support member to effectively support the inner wall of the central hole at various points.

[0010] In one possible technical solution, the first support part is provided with a first inner cavity, the second support part is provided with a second inner cavity, and the first inner cavity and the second inner cavity are interconnected.

[0011] With the internal spaces of the first support section and the second support section connected to each other, the exhaust function inside the central hole is improved, and the gas generated by the battery cell can circulate better in the central hole, further enhancing the safety performance of the battery cell.

[0012] In one possible technical solution, a first inclined surface is provided with a first opening, and a second inclined surface is provided with a second opening, the first opening and the second opening connecting the first inner cavity and the second inner cavity.

[0013] With holes made on the first and second inclined surfaces, the first and second inner cavities can be directly connected through the holes on the first and second inclined surfaces. There is no need to set up an additional structure between the first and second support parts to connect the first and second inner cavities, which helps to simplify the structure of the support member and also helps to improve the stability of the connection between the first and second inner cavities.

[0014] In one possible technical solution, the battery cell further includes: a first reinforcing rib and a second reinforcing rib, the first reinforcing rib being connected to a first support portion and dividing the first opening into at least two first sub-holes. The second reinforcing rib is connected to a second support portion and divides the second opening into at least two second sub-holes.

[0015] The first support component has relatively low structural strength at the location of the first opening. By setting a first reinforcing rib across the first opening, the structural strength of the first support component at the location of the first opening is improved, preventing structural deformation of the first support component. Similarly, a second reinforcing rib can improve the structural strength of the second support component at the location of the second opening, preventing structural deformation of the second support component.

[0016] In one possible technical solution, one of the first inclined plane and the second inclined plane is a convex surface and the other is a concave surface, with the convex and concave surfaces interlocked.

[0017] When the first inclined surface and the second inclined surface are interlocked, the first inclined surface and the second inclined surface can limit each other, thereby restricting the movement of the first support part and the second support part in the central hole, which helps to improve the installation stability of the first support part and the second support part in the central hole.

[0018] In one possible technical solution, both the first inclined plane and the second inclined plane are planes, or both the first inclined plane and the second inclined plane are helical surfaces.

[0019] In one possible technical solution, the first support part is provided with a first positioning part, the second support part is provided with a second positioning part, and the first positioning part and the second positioning part are interlocked.

[0020] By interlocking the first positioning part and the second positioning part, the first support part and the second support part are less likely to move around, which helps to improve the installation stability of the first support part and the second support part in the central hole.

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

[0022] In one possible technical solution, along the axial direction of the battery cell, the length of the battery cell is L2, and the length of the support member is L1, where L1≥L2≥0.7×L1.

[0023] By increasing the length of the support member, the length of the supported position inside the central hole can be increased, thereby ensuring that most of the inner wall of the central hole is supported by the support member, effectively preventing the central hole from collapsing.

[0024] Secondly, embodiments of this application propose an electrical device, which includes a battery cell from any of the above solutions.

[0025] 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

[0026] 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:

[0027] Figure 1 This is one of the structural schematic diagrams of a battery cell according to an embodiment of the present invention;

[0028] Figure 2 This is a second schematic diagram of the structure of a battery cell according to an embodiment of the present invention;

[0029] Figure 3 This is a structural schematic diagram of the support member according to an embodiment of the present invention;

[0030] Figure 4 This is one of the structural schematic diagrams of the first support portion according to an embodiment of the present invention;

[0031] Figure 5 This is one of the structural schematic diagrams of the second support portion according to an embodiment of the present invention;

[0032] Figure 6 This is a second schematic diagram of the structure of the first support portion according to an embodiment of the present invention;

[0033] Figure 7 This is a second schematic diagram of the structure of the second support part according to an embodiment of the present invention;

[0034] Figure 8 This is the third structural schematic diagram of the first support portion according to an embodiment of the present invention;

[0035] Figure 9 This is the third structural schematic diagram of the second support portion according to an embodiment of the present invention;

[0036] Figure 10This is a schematic diagram of the structure of the first support portion and the second support portion according to an embodiment of the present invention;

[0037] Figure 11 This is a schematic diagram of the structure of the first support portion and the second support portion clamping the battery cell separator according to an embodiment of the present invention;

[0038] Figure 12 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present invention.

[0039] Figure label:

[0040] 10 Electrical equipment, 100 Battery cell, 110 Battery cell, 111 Center hole, 112 Battery cell separator, 120 Support component, 121 First support part, 122 Second support part, 123 First inclined surface, 124 Second inclined surface, 125 First inner cavity, 126 Second inner cavity, 127 First opening, 128 Second opening, 129 First reinforcing rib, 130 First sub-hole, 131 Second reinforcing rib, 132 Second sub-hole, 133 First positioning part, 134 Second positioning part. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] The following is combined Figures 1-12 A battery cell and an electrical device according to embodiments of the present invention are described.

[0046] With the continuous development of various industries, people's demand for high-energy batteries is increasing. Cylindrical batteries have advantages such as high energy and long service life, and are therefore widely used in various industries. People's demand for the safety and reliability of these cylindrical batteries is also constantly increasing.

[0047] Current cylindrical batteries have a central hole inside. During the charging and discharging process, the electrodes of the battery cells expand and contract, compressing the central hole radially. This may cause the electrodes to collapse, resulting in wrinkles on the electrode surface and creating a safety hazard.

[0048] In related technologies, to address the issue of central hole collapse caused by material expansion during cycling in cylindrical batteries, a central pin is required inside the cell as a support. To effectively support the central hole, the radial dimension of the central pin is close to that of the central hole. However, during the insertion of the central pin into the central hole, it may scrape against the separator or electrode plates inside the cell, increasing the difficulty of threading the pin and potentially damaging the cell.

[0049] Based on the above considerations, this solution adopts a support component composed of a first support part and a second support part. Both the first and second support parts have a structure where one end is smaller than the other. The smaller ends of the first and second support parts are inserted into the central hole from opposite sides of the battery cell. Because the radial dimension of the insertion end of the first support part is smaller, it can be easily inserted into the central hole. Similarly, the radial dimension of the insertion end of the second support part is smaller, making it easy to insert into the central hole. This installation method is less likely to cause scratches to the battery cell. Furthermore, the support component formed after the first and second support parts are installed can effectively support the central hole, improving the ease of installation.

[0050] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source. These devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0051] like Figure 12 As shown, the battery cell 100 described in the embodiments of this application is not only applicable to the electrical device 10 described above, but also applicable to all electrical devices 10 that use the battery cell 100.

[0052] In embodiments of this application, one or more battery cells can form a battery; that is, a battery refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, a battery is composed of multiple battery cells connected in series or parallel. The battery can be used to power a 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 power requirements of the vehicle 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] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 11As shown, according to some embodiments of this application, a battery cell 100 includes a cell 110 and a support member 120. The cell 110 has a central hole 111, and the support member 120 is located within the central hole 111. The support member 120 includes a first support portion 121 and a second support portion 122, which extend radially from the cell 110. Figure 1 (The arrow at point R points to) The cross-sectional area of ​​the first end of the first support portion 121 is smaller than the cross-sectional area of ​​the second end of the first support portion 121, and the cross-sectional area of ​​the first end of the second support portion 122 is smaller than the cross-sectional area of ​​the second end of the second support portion 122. The first end of the first support portion 121 is inserted into the central hole 111 from the first side of the battery cell 110, and the first end of the second support portion 122 is inserted into the central hole 111 from the second side of the battery cell 110. The first support portion 121 is provided with a first inclined surface 123, and the second support portion 122 is provided with a second inclined surface 124. A battery cell separator 112 is disposed in the central hole 111, and the first inclined surface 123 and the second inclined surface 124 clamp the battery cell separator 112.

[0055] The battery cell 110 is typically formed by winding an anode plate, a diaphragm, a cathode plate, and another diaphragm using a winding device. After the battery cell 110 is manufactured, a central hole 111 is provided in the center of the cell. This central hole 111 allows gas to flow inside the battery cell 110, serving a venting function, reducing the internal gas pressure, and preventing excessive expansion or contraction of the battery cell 110. As the battery cell 110 is used over time, chemical reactions inside the cell will produce gas. If this gas cannot flow, it will lead to excessively high internal pressure, which can easily cause an explosion or even a fire. The central hole 111 allows this gas to escape smoothly, ensuring stable operation of the battery cell 110 and preventing accidents.

[0056] The support member 120 is installed inside the central hole 111. The support member 120 supports the inner wall of the central hole 111. Under conditions of high cyclic expansion force, the central hole 111 of the battery cell 110 is at risk of collapse. Therefore, the support member 120 is installed inside the central hole 111 to support it. The support member 120 can mitigate the problem of collapse in the central hole 111, thus improving the quality and service life of the battery cell 110.

[0057] In this embodiment, the support member 120 includes a first support portion 121 and a second support portion 122. The first support portion 121 and the second support portion 122 form a cylindrical support member 120. Therefore, the support member 120 in this embodiment is a split structure. When the support member 120 needs to be installed in the central hole 111, the first support portion 121 and the second support portion 122 extend into the central hole 111 from both sides of the battery cell 110, that is, the first support portion 121 extends into the central hole 111 from the first side of the battery cell 110, and the second support portion 122 extends into the central hole 111 from the second side of the battery cell 110.

[0058] The first end of the first support portion 121 has a relatively small cross-sectional area, and the second end of the first support portion 121 has a relatively large cross-sectional area. Therefore, the first support portion 121 has a structure with a large cross-sectional area at one end and a small cross-sectional area at the other end. When the first support portion 121 needs to be inserted into the central hole 111, the first end of the first support portion 121 is inserted into the central hole 111 first. Since the first end of the first support portion 121 is relatively small, it is easier to insert the first support portion 121 into the central hole 111. Similarly, the first end of the second support portion 122 has a relatively small cross-sectional area, and the second end of the second support portion 122 has a relatively large cross-sectional area. Therefore, the second support portion 122 has a structure with a large cross-sectional area at one end and a small cross-sectional area at the other end. When the second support portion 122 needs to be inserted into the central hole 111, the first end of the second support portion 122 is inserted into the central hole 111 first. Since the first end of the second support portion 122 is relatively small, it is easier to insert the second support portion 122 into the central hole 111. By inserting the smaller end of the first support portion 121 and the second support portion 122 into the center hole 111 first, the first support portion 121 and the second support portion 122 are less likely to scratch the battery cell 110. Moreover, the support member 120 formed after the first support portion 121 and the second support portion 122 are installed can also effectively support the center hole 111. The above method effectively improves the installation convenience of the support member 120.

[0059] A first inclined surface 123 is provided on one side of the first support portion 121. The first inclined surface 123 extends from the first end of the first support portion 121 to the second end of the first support portion 121. The first inclined surface 123 is inclined relative to the center line of the center hole 111. The first support portion 121 is equivalent to having a portion of its side cut off. Furthermore, the degree of cutting of the first support portion 121 gradually increases from the second end to the first end of the first support portion 121, thereby making the first support portion 121 form a shape with a gradually increasing cross-sectional area.

[0060] A second inclined surface 124 is provided on one side of the second support portion 122. The second inclined surface 124 extends from the first end of the second support portion 122 to the second end of the second support portion 122. The second inclined surface 124 is inclined relative to the center line of the center hole 111. The second support portion 122 is equivalent to having a portion of its side cut off. Furthermore, the degree of cutting of the second support portion 122 gradually increases from the second end to the first end of the second support portion 122, thereby making the second support portion 122 form a shape with a gradually increasing cross-sectional area.

[0061] A cell separator 112 is provided on the inner wall of the central hole 111. In this embodiment, after the support member 120 is installed, since the support member 120 is a split structure, the cell separator 112 can be clamped by the first inclined surface 123 and the second inclined surface 124. In this case, it is not necessary to remove the cell separator 112 in the central hole 111 by heat treatment, which saves the step of heat treatment of the cell separator 112 and reduces the degree of damage to the cell 110, which is conducive to improving the stability of the cell 110 structure.

[0062] like Figure 1 As shown, in one possible embodiment, the cross-sectional area of ​​the first support portion 121 increases along the radial direction of the cell 110, from the first end of the first support portion 121 to the second end of the first support portion 121. Similarly, the cross-sectional area of ​​the second support portion 122 increases along the radial direction of the cell 110, from the first end of the second support portion 122 to the second end of the second support portion 122.

[0063] The first support portion 121 is cut radially along the cell 110 to obtain multiple cross sections of the first support portion 121. The cross-sectional area of ​​the multiple cross sections of the first support portion 121 gradually increases from the first end to the second end of the first support portion 121. Therefore, the first support portion 121 has a gradually thickening shape from the first end to the second end of the first support portion 121.

[0064] The second support portion 122 is cut radially along the cell 110 to obtain multiple cross sections of the second support portion 122. The cross-sectional area of ​​the multiple cross sections of the second support portion 122 gradually increases from the first end to the second end of the second support portion 122. Therefore, the second support portion 122 has a gradually thickening shape from the first end to the second end of the second support portion 122.

[0065] Both the first support portion 121 and the second support portion 122 have a shape that gradually increases in radial dimension. Before the first support portion 121 is installed in place, it is less likely to scrape against the inner wall of the central hole 111. Similarly, before the second support portion 122 is installed in place, it is less likely to scrape against the inner wall of the central hole 111. This further improves the ease of installation of the first support portion 121 and the second support portion 122 and reduces the probability of damage to the battery cell 110.

[0066] The thinner part of the first support part 121 corresponds to the thicker part of the second support part 122, and the thicker part of the first support part 121 corresponds to the thinner part of the second support part 122. The support member 120 composed of the first support part 121 and the second support part 122 has a small difference in thickness at various points, so that the support member 120 can effectively support the inner wall of the central hole 111 at various points.

[0067] Combination Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in one possible embodiment, the first support portion 121 is provided with a first inner cavity 125, and the second support portion 122 is provided with a second inner cavity 126, with the first inner cavity 125 and the second inner cavity 126 communicating with each other.

[0068] The first support portion 121 has a first inner cavity 125 inside, thus the first support portion 121 has a cavity structure. The second support portion 122 has a second inner cavity 126 inside, thus the second support portion 122 also has a cavity structure. When the first support portion 121 and the second support portion 122 are installed into the central hole 111, the first inner cavity 125 and the second inner cavity 126 are in a state of mutual communication. Therefore, gas can flow between the first inner cavity 125 and the second inner cavity 126.

[0069] When the internal spaces of the first support portion 121 and the second support portion 122 are interconnected, the exhaust function inside the central hole 111 is stable, and the gas generated by the battery cell 110 flows better within the central hole 111, further improving the safety performance of the battery cell 110.

[0070] Combination Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in one possible embodiment, the first inclined surface 123 is provided with a first opening 127, and the second inclined surface 124 is provided with a second opening 128. The first opening 127 and the second opening 128 connect the first inner cavity 125 and the second inner cavity 126.

[0071] A first opening 127 is formed on the first inclined surface 123, communicating with the first inner cavity 125. A second opening 128 is formed on the second inclined surface 124, communicating with the second inner cavity 126. When the first support portion 121 and the second support portion 122 are installed in the central hole 111, the first inclined surface 123 and the second inclined surface 124 are close to each other, and the first opening 127 and the second opening 128 are interconnected, thereby enabling the first inner cavity 125 and the second inner cavity 126 to communicate through the first opening 127 and the second opening 128.

[0072] With holes made in the first inclined surface 123 and the second inclined surface 124, the first inner cavity 125 and the second inner cavity 126 can be directly connected through the holes in the first inclined surface 123 and the second inclined surface 124. There is no need to set an additional structure between the first support part 121 and the second support part 122 to connect the first inner cavity 125 and the second inner cavity 126. This is beneficial to simplify the structure of the support member 120 and also to improve the stability of the connection between the first inner cavity 125 and the second inner cavity 126.

[0073] Combination Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in one possible embodiment, the battery cell 100 further includes a first reinforcing rib 129 and a second reinforcing rib 131. The first reinforcing rib 129 is connected to the first support portion 121 and divides the first opening 127 into at least two first sub-holes 130. The second reinforcing rib 131 is connected to the second support portion 122 and divides the second opening 128 into at least two second sub-holes 132.

[0074] A first reinforcing rib 129 can be provided on the first support part 121. The first reinforcing rib 129 spans the first opening 127, thereby dividing the first opening 127 into two first sub-holes 130. As the number of first reinforcing ribs 129 increases, the number of first sub-holes 130 will also increase. For example, if there are two first reinforcing ribs 129, the number of first sub-holes 130 will be three.

[0075] Similarly, a second reinforcing rib 131 is provided on the second support part 122. The second reinforcing rib 131 spans the second opening 128, thereby dividing the second opening 128 into two second sub-holes 132. As the number of second reinforcing ribs 131 increases, the number of second sub-holes 132 will also increase.

[0076] The first support portion 121 has relatively low structural strength at the location of the first opening 127. By providing a first reinforcing rib 129 spanning the first opening 127, the structural strength of the first support portion 121 at the location of the first opening 127 is improved, preventing structural deformation of the first support portion 121. The second reinforcing rib 131 can improve the structural strength of the second support portion 122 at the location of the second opening 128, preventing structural deformation of the second support portion 122.

[0077] The first support portion 121 and the second support portion 122 are not easily deformed, so that the support member 120 composed of the first support portion 121 and the second support portion 122 can stably support the inner wall of the central hole 111.

[0078] like Figure 10 As shown, in one possible embodiment, one of the first inclined surface 123 and the second inclined surface 124 is a convex surface and the other is a concave surface, with the convex and concave surfaces interlocking with each other.

[0079] The shapes of the first inclined surface 123 and the second inclined surface 124 are mutually compatible. In this embodiment, the first inclined surface 123 is convex and thus has an arched appearance. The second inclined surface 124 is concave and thus recessed inward. When the first support portion 121 and the second support portion 122 are installed in place, at least a portion of the convex surface is embedded in the concave surface, and the convex and concave surfaces form an interlocking structure.

[0080] When the first inclined surface 123 and the second inclined surface 124 are inserted into each other, the first inclined surface 123 and the second inclined surface 124 can limit each other, thereby restricting the first support part 121 and the second support part 122 from moving within the central hole 111, which is beneficial to improving the installation stability of the first support part 121 and the second support part 122 within the central hole 111.

[0081] In one possible embodiment, the first inclined surface 123 and the second inclined surface 124 are both planes, or the first inclined surface 123 and the second inclined surface 124 are both helical surfaces.

[0082] The first inclined surface 123 and the second inclined surface 124 have the same shape and are compatible with each other, so that a small gap is maintained between the first inclined surface 123 and the second inclined surface 124, thereby improving the fit between the first support part 121 and the second support part 122 and improving the structural stability of the support member 120 composed of the first support part 121 and the second support part 122.

[0083] Combination Figure 1 , Figure 2 , Figure 8 and Figure 9As shown, in one possible embodiment, the first support portion 121 is provided with a first positioning portion 133, and the second support portion 122 is provided with a second positioning portion 134, with the first positioning portion 133 and the second positioning portion 134 being interlocked.

[0084] A first positioning part 133 is provided on the first support part 121, and a second positioning part 134 is provided on the second support part 122 corresponding to the position of the first positioning part 133. After the first support part 121 and the second support part 122 are installed, the first positioning part 133 is directly opposite the second positioning part 134, and the first positioning part 133 and the second positioning part 134 are inserted into each other. At this time, the first support part 121 and the second support part 122 limit each other.

[0085] By interlocking the first positioning part 133 and the second positioning part 134, the first support part 121 and the second support part 122 are less likely to move around, which helps to improve the installation stability of the first support part 121 and the second support part 122 in the center hole 111.

[0086] For example, the first positioning part 133 is a protrusion and the second positioning part 134 is a groove, with the protrusion inserted into the groove.

[0087] In one possible embodiment, the support 120 includes a metal support, or the support 120 includes a thermoplastic support.

[0088] The support member 120 can be made of metal, which helps to improve the hardness of the support member 120 and thus improve the support effect on the center hole 111.

[0089] Alternatively, the support 120 can also be made of thermoplastic non-metallic material, specifically an electrolyte-resistant material, to prevent the support 120 from being corroded by the electrolyte.

[0090] Combination Figure 2 and Figure 3 As shown, in one possible embodiment, along the axial direction of cell 110 ( Figure 1 (The arrow at H in the middle points to) The length of the cell 110 is L2, and the length of the support 120 is L1, L1≥L2≥0.7×L1.

[0091] The length of the support member 120 is 70% to 100% of the length of the cell 110, that is, the length of the support member 120 is at least 70% of the length of the cell 110.

[0092] By increasing the length of the support member 120, the length of the supported position inside the central hole 111 can be increased, so that most of the inner wall inside the central hole 111 is supported by the support member 120, effectively preventing the central hole 111 from collapsing.

[0093] To address the technical challenge of difficult coiling of the support component 120 during manufacturing, this embodiment employs a two-half-needle design (first support part 121 and second support part 122) to achieve a smaller gap between the inserted pins and improve the support strength for the central hole 111. The two-half-needle design involves diagonally cutting a cylindrical sleeve into two identical half-needle structures, each with one end smaller than the other. The diagonally cut ends are sealed and perforated to allow for smooth gas flow within the central hole 111. The sealed end also provides sufficient support, and the sealing platform ensures more precise pin positioning. Finally, during pin insertion, the two half-needles are inserted into the positive and negative terminals of the battery cell 110 with their pointed ends.

[0094] In the embodiments of this application, the cylindrical cell 110 has a central hole 111. To address the problem of the central hole 111 collapsing due to material expansion during cycling, a support member 120 is required inside the cell 110. This solution employs a two-half support member 120 structure. This addresses the difficulties of inserting the support member 120, the insufficient support strength due to the support member 120's diameter being much smaller than the central hole 111's diameter, and the issue of micro-collapse of the central hole 111 in the battery cell 100 during cycling, which causes wrinkling of the electrode sheets and lithium plating, significantly impacting battery safety. The identical first support portion 121 and second support portion 122 effectively solve the difficulties of inserting the pin and reducing the gap, providing a more stable support for the central hole 111. During the process of inserting the center pin, there is no need to perform the hot hole step. The pointed end of the support member 120 is inserted into the center hole 111. The intermediate diaphragm provides friction so that the first support part 121 and the second support part 122 will not slip relative to each other.

[0095] The support member 120 includes a first support portion 121 and a second support portion 122. The first support portion 121 and the second support portion 122 complement each other to form a columnar support member 120. The first support portion 121 and the second support portion 122 are inserted into the center hole 111 from both ends of the battery cell 110.

[0096] This invention employs an innovative two-part support 120. The first support portion 121 and the second support portion 122 are mating structures, and the inner hole of the central pin is a through structure, which increases the venting area. The first support portion 121 and the second support portion 122 can be centrally symmetrically fitted. The first support portion 121 and the second support portion 122 can be inserted into the cell 110 with a small gap. The oblique ends of the first support portion 121 and the second support portion 122 are in a semi-closed state, with an opening at the seal. The purpose of the opening is to allow gas to flow smoothly inside the support 120. The seal helps to improve the support strength and prevents the support 120 from deforming due to insufficient support caused by misalignment during the pin insertion process. The opening does not affect its venting performance. Similarly, the opening allows gas to be smoothly ejected from the explosion-proof valve when the cylindrical battery fails a short circuit due to a needle penetration test, preventing the cell 110 from catching fire due to obstructed venting during safety performance testing. The central hole 111 is in an octagonal shape and has two diaphragms in the middle. Traditionally, when inserting a pin, the hole needs to be heated first to heat the two diaphragms in the middle of the hole to the inner wall of the hole before the pin can be inserted. The advantage of the first support part 121 and the second support part 122 is that both of them have a structure that is larger at one end and smaller at the other. When inserting the pin, the smaller end is first inserted into the inside of the battery cell 110. After reaching the position along the internal channel of the central hole 111, the first support part 121 and the second support part 122 are attached together to form a complete support part 120, which can save the heating process.

[0097] The first support portion 121 and the second support portion 122 both have a structure with one end larger than the other. The smaller end allows the first support portion 121 and the second support portion 122 to be better inserted into the center hole 111, which is beneficial for industrialization during the pin insertion process. The structure with one end larger than the other avoids the problem of difficult pin insertion and is suitable for all battery cells 110 with a center hole 111.

[0098] The first support portion 121 and the second support portion 122 can achieve a variable diameter. The wedge-shaped surfaces of the first support portion 121 and the second support portion 122 cooperate with each other to achieve the variable diameter technology. The variable diameter function makes it easier for the support member 120 to be inserted into the battery cell 110 and also provides a supporting effect.

[0099] The contact surface or cavity of the first support part 121 and the second support part 122 are designed with reinforcing ribs. The reinforcing ribs can increase the stability of the material and the hardness of the support 120, further improve its support effect, and withstand the internal stress of the battery cell 110 without deformation.

[0100] The contact surfaces of the first support part 121 and the second support part 122 are interconnected, which improves the venting performance when the battery cell 110 fails. The gas generated by the battery cell 110 flows better at the central hole 111, further improving the safety performance of the battery cell 110.

[0101] The contact surfaces of the first support portion 121 and the second support portion 122 can be mechanically interlocked by friction. The mechanical interlock can be achieved by the first support portion 121 being raised and the second support portion 122 being recessed.

[0102] The mating surfaces of the first support portion 121 and the second support portion 122 are designed with a stepped shape, which can achieve mechanical interlocking and prevent the first support portion 121 and the second support portion 122 from misalignment and slippage caused by the internal stress compression of the battery cell 110 during the cycle. In addition to designing a matching interlocking structure, interlocking can also be achieved through friction.

[0103] The support component 120 can be made of metal or non-metal materials, with polypropylene, polyethylene and other electrolyte-resistant insulating materials being preferred, so that the support component 120 will not be corroded by electrolyte.

[0104] The length of the support member 120 is 70% to 100% of the length of the battery cell 110, which helps to improve the support strength of the battery cell 110. The diameter of the support member 120 is 1 mm to 20 mm, and the diameter of the support member 120 is set according to the diameter of the battery cell 110.

[0105] The first support part 121 and the second support part 122 can enable the insertion of pins into the center hole 111 without prior heat treatment.

[0106] The first support portion 121 and the second support portion 122 complement each other to form a complete support member 120. The support member 120 mainly consists of a wedge-shaped first support portion 121 and a similarly wedge-shaped second support portion 122. The first support portion 121 and the second support portion 122 are fitted together with a snap-fit ​​and a slot as a limiting structure. The mating surfaces of the first support member 120 and the second support member 120 are designed with a sealed opening. After the first support portion 121 and the second support portion 122 are inserted, the openings are aligned. The snap-fit ​​and the slot can be designed at any position on the mating surfaces of the first support portion 121 and the second support portion 122. The snap-fit ​​and the slot are complementary structures, and their shapes can be serrated. They are inserted into the battery cell 110 to achieve a tight locking and limiting effect. The first support portion 121 and the second support portion 122 are inserted into the anode and cathode at both ends of the battery cell 110, respectively, and enter the central hole 111 until the snap-fit ​​and the slot are embedded and fixed. The support member 120 is in the form of a sleeve. The inner hole of the support member 120 can be a through hole structure of any shape, and can be solid. The material of the support member 120 can be any material with sufficient strength. The mating surfaces of the first support part 121 and the second support part 122 can be irregular surfaces or wavy slopes. The first support part 121 and the second support part 122 are complementary structures forming a complete cylindrical structure.

[0107] 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.

[0108] 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 in that, include: The battery cell has a central hole; A support member is located inside the central hole. The support member includes a first support portion and a second support portion. Along the radial direction of the battery cell, the cross-sectional area of ​​the first end of the first support portion is smaller than the cross-sectional area of ​​the second end of the first support portion, and the cross-sectional area of ​​the first end of the second support portion is smaller than the cross-sectional area of ​​the second end of the second support portion. The first end of the first support portion is inserted into the central hole from the first side of the battery cell, and the first end of the second support portion is inserted into the central hole from the second side of the battery cell. The first support portion is provided with a first inclined surface, the second support portion is provided with a second inclined surface, and a cell separator is provided in the central hole. The first inclined surface and the second inclined surface clamp the cell separator.

2. The battery cell according to claim 1, characterized in that, Along the radial direction of the battery cell, from the first end of the first support portion to the second end of the first support portion, the cross-sectional area of ​​the first support portion increases; Along the radial direction of the battery cell, from the first end of the second support portion to the second end of the second support portion, the cross-sectional area of ​​the second support portion increases.

3. The battery cell according to claim 1, characterized in that, The first support portion has a first inner cavity, and the second support portion has a second inner cavity, with the first inner cavity and the second inner cavity communicating with each other.

4. The battery cell according to claim 3, characterized in that, The first inclined surface is provided with a first opening, and the second inclined surface is provided with a second opening. The first opening and the second opening connect the first inner cavity and the second inner cavity.

5. The battery cell according to claim 4, characterized in that, The battery cell also includes: A first reinforcing rib is connected to the first support portion, and the first reinforcing rib divides the first opening into at least two first sub-holes. The second reinforcing rib is connected to the second support portion, and the second reinforcing rib divides the second opening into at least two second sub-holes.

6. The battery cell according to claim 1, characterized in that, One of the first inclined surface and the second inclined surface is a convex surface, and the other is a concave surface, and the convex surface and the concave surface are interlocked.

7. The battery cell according to claim 1, characterized in that, Both the first inclined plane and the second inclined plane are planes, or both the first inclined plane and the second inclined plane are helical surfaces.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The first support part is provided with a first positioning part, and the second support part is provided with a second positioning part, and the first positioning part and the second positioning part are interlocked.

9. The battery cell according to any one of claims 1 to 7, characterized in that, The support member may include a metal support member, or the support member may include a thermoplastic support member.

10. The battery cell according to any one of claims 1 to 7, characterized in that, Along the axial direction of the battery cell, the length of the battery cell is L2, and the length of the support member is L1, where L1≥L2≥0.7×L1.

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

Images