Supporting piece, cylindrical battery and battery pack

Abstract

The utility model relates to the technical field of power batteries, and provides a supporting piece, a cylindrical battery and a battery pack, the supporting piece is inserted into a through hole in the middle of a roll core of the cylindrical battery, one end of the supporting piece is provided with a guide surface, the guide surface is a curved surface, and the radial cross sectional area of the guide surface is gradually reduced along the direction of inserting the supporting piece into the through hole. According to the supporting piece, the guide head with the curved guide surface is arranged at one end of the supporting piece, and the radial area of the guide surface is gradually reduced in the direction of being inserted into the through hole, so that the supporting piece is more easily inserted into the through hole, the assembly efficiency can be improved, the supporting piece is prevented from damaging a roll core in the insertion process, and the service life of the roll core is prolonged. Therefore, the structural integrity and the performance stability of the roll core can be protected, and the use performance of the cylindrical battery can be ensured.

Description

Support components, cylindrical batteries and battery packs Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a support member; it also relates to a cylindrical battery with the support member, and a battery pack with the cylindrical battery. Background Technology

[0002] The core of a cylindrical battery is its central component, typically composed of a positive electrode, a negative electrode, and a separator wound together. During the winding process, the winding is generally centered on a cylindrical object. This allows for better control of the winding tension and precision, ensuring that the positive electrode, negative electrode, and separator are wound evenly and tightly together to form a structurally stable core. Therefore, after winding is complete, removing the central cylindrical object creates the central through-hole.

[0003] To ensure the performance of cylindrical batteries, a support is typically inserted into a through-hole in the center of the winding core. This support provides structural support, maintains the core's shape, and prevents deformation or damage during charging and discharging due to volume changes or other factors. However, the structural design of the support in existing technologies is flawed, leading to difficulties in insertion and potential damage to the winding core during the insertion process. Summary of the Invention

[0004] In view of this, the present invention aims to provide a support member that facilitates insertion into the through hole of the winding core and helps to prevent damage to the winding core.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A support member is inserted into a through hole in the middle of the core of a cylindrical battery. One end of the support member is provided with a guide surface. The guide surface is curved and its radial cross-sectional area gradually decreases along the direction of insertion into the through hole.

[0007] Furthermore, the guide surface is elliptical or spherical; and when the guide surface is spherical, the radius r and height h of the guide surface satisfy: r ≥ h.

[0008] Furthermore, the roundness of the guide surface is between 0 and 0.1.

[0009] Furthermore, the support member has a conformally shaped cavity inside, and the other end of the cavity passes through the support member relative to the guide surface; the guide surface has a drainage hole for connecting the inside and outside of the support member.

[0010] Furthermore, the diameter d of the drain hole satisfies: 0.15mm≤d≤0.45mm.

[0011] Furthermore, the drainage hole includes a first drainage hole extending axially along the support member, and a plurality of second drainage holes spaced circumferentially along the first drainage hole.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] The support member described in this utility model has a guide head with a curved guide surface at one end. The radial area of ​​the guide surface gradually decreases along the direction of insertion through hole. This not only makes it easier for the support member to be inserted into the through hole, thus improving assembly efficiency, but also helps to prevent the support member from damaging the core during insertion. This helps to protect the structural integrity and performance stability of the core, thereby ensuring the performance of the cylindrical battery.

[0014] Secondly, both the elliptical and spherical guide surfaces are smooth curved surfaces. Compared to other shapes, they have a smaller contact area with the through-hole wall when inserted into the core, thus reducing insertion resistance and making it easier for the support to be inserted into the through-hole in the center of the core. Simultaneously, the elliptical and spherical guide surfaces have good axial symmetry, providing good guidance regardless of the insertion direction, making it easier for the support to align with the center of the through-hole, reducing offset and tilting during insertion, preventing damage to the core, and protecting the structural integrity of the core. The roundness of the guide surface is between 0-0.1, preventing the guide surface from being too sharp and causing poor adhesion between the insertion end of the support and the diaphragm, thus preventing the support from shaking and improving its support effect. It also improves the positioning accuracy of the support in the core, and when the guide surface contacts the through-hole of the core, it helps prevent the electrode plates or diaphragm of the core from being scratched or punctured.

[0015] Furthermore, the support component features a conformal cavity, which, while maintaining structural strength, reduces its weight and saves production costs. A drain hole is located on the guide head, with one end of the cavity penetrating the support component, allowing the electrolyte flowing into the cavity to drain out through the drain hole. This prevents electrolyte residue in the cavity and improves the wetting effect. The diameter d of the drain hole is between 0.15-0.45 mm, which satisfies the electrolyte outflow requirement within the cavity and prevents damage to the core at the drain hole. A drain hole diameter less than 0.15 mm results in poor electrolyte drainage, while a diameter greater than 0.45 mm can damage the core, affecting the performance of the cylindrical battery. The first drain hole extends axially along the support component, providing a primary flow channel for the electrolyte. Multiple second drain holes are circumferentially spaced, working in conjunction with the first drain hole to improve the efficiency of electrolyte drainage from the cavity into the support component.

[0016] In addition, another objective of this utility model is to provide a cylindrical battery, wherein the cylindrical battery is provided with the support member as described above.

[0017] The cylindrical battery described in this utility model, by setting the above-mentioned support component, helps to improve assembly efficiency and performance.

[0018] In addition, this utility model also proposes a battery pack, wherein the battery pack is provided with the cylindrical battery as described above.

[0019] The battery pack described in this utility model, by setting up the cylindrical battery as described above, helps to improve the performance and safety of the battery pack. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0021] Figure 1 is a structural schematic diagram of the support member according to one exemplary embodiment of the present utility model;

[0022] Figure 2 is a structural schematic diagram of the support member in another exemplary embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Support component; 101. Guide surface; 1011. First drain hole; 1012. Second drain hole; 102. Cavity. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0026] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0027] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" 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 utility model in light of the specific circumstances.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Example 1

[0031] This embodiment relates to a support member 1, which is inserted into the through hole in the middle of the core of a cylindrical battery, in order to solve the problems of the support member 1 in the prior art being inconvenient to insert due to its unreasonable structure, and easily damaging the core during the insertion process.

[0032] In terms of overall structure, one end of the support member 1 described in this embodiment is provided with a guide surface 101. The guide surface 101 is curved, and the radial cross-sectional area of ​​the guide surface 101 gradually decreases along the direction of the insertion through hole.

[0033] The support member 1 described in this embodiment has a guide head with a curved guide surface 101 at one end. The radial area of ​​the guide surface 101 gradually decreases along the direction of insertion through hole. This not only makes it easier for the support member 1 to be inserted into the through hole and improves assembly efficiency, but also helps to prevent the support member 1 from damaging the winding core during insertion. This helps to protect the structural integrity and performance stability of the winding core, and thus helps to ensure the performance of the cylindrical battery.

[0034] Based on the above overview, an exemplary structure of the support member 1 in this embodiment is shown in Figure 1. The direction of insertion into the through hole is the insertion direction indicated by the arrow in the figure. As a preferred embodiment, the guide surface 101 is elliptical in shape. An ellipse, when rotated about its major axis, forms an ellipsoid, and the elliptical head is the shape of the head of the ellipsoid. A spherical crown refers to the shape formed by the portion of a hemisphere truncated by a plane.

[0035] The elliptical guide surfaces 101 here are all smooth curved surfaces. Compared with other shapes, when inserting the core through hole, the contact area between the elliptical guide surface 101 and the through hole wall is smaller, which helps to reduce the resistance during insertion and makes it easier for the support member 1 to be inserted into the through hole in the middle of the core. At the same time, the elliptical guide surfaces 101 have good axisymmetry, which can play a good guiding role no matter which direction the core is inserted from, making it easier for the support member 1 to be aligned with the center of the through hole, reducing offset and tilt during the insertion process, preventing damage to the core, and helping to protect the structural integrity of the core.

[0036] As another structural example of the support member 1, as shown in Figure 2, the guide surface 101 can also be spherical, and the radius r and height h of the guide surface 101 satisfy: r ≥ h. This ensures that the radius r and height h of the guide surface 101 satisfy: r ≥ h. When r = h, the guide surface 101 is a hemisphere; when r < h, the guide surface 101 is relatively flat. During the insertion of the support member 1 into the through hole in the middle of the cylindrical battery core, the hemispherical or flattened spherical guide surface 101 makes it easier for the support member 1 to be inserted into the through hole without damaging the core.

[0037] In a preferred embodiment, the roundness of the guide surface 101 is between 0 and 0.1. This roundness helps prevent the guide surface 101 from being too sharp, which could cause the insertion end of the support member 1 to not fit tightly with the diaphragm, thus preventing the support member 1 from wobbling and improving its support effect. Simultaneously, it also improves the positioning accuracy of the support member 1 within the core, and when the guide surface 101 contacts the core's through-hole, it helps prevent the core's diaphragm from being scratched or punctured.

[0038] Furthermore, setting the roundness of the guide surface 101 to between 0 and 0.1 allows it to better match the circular inner wall of the through hole in the winding core, making it easier to align with the center of the through hole during insertion. This improves the positioning accuracy of the support member 1 within the winding core, and also helps the support member 1 provide uniform and stable support to the winding core, thereby ensuring the symmetry and stability of the battery's internal structure and improving the overall performance of the battery. In specific implementations, the roundness of the guide surface 101 can be, for example, 0, 0.02, 0.04, 0.05, 0.06, 0.08, or 0.1.

[0039] In a preferred embodiment, the support member 1 has a conformally shaped cavity 102 inside, with the other end of the cavity 102 penetrating through the support member 1 relative to the guide surface 101; a drain hole is provided through the guide surface 101 to connect the inside and outside of the support member 1. The conformally shaped cavity 102 inside the support member 1 helps reduce its weight while maintaining structural strength, thus saving production costs. Furthermore, the drain hole on the guide surface 101 and the fact that one end of the cavity 102 penetrates the support member 1 allow the electrolyte flowing into the cavity 102 to drain out through the drain hole, preventing electrolyte residue in the cavity 102 and improving the wetting effect of the electrolyte.

[0040] It should be noted that the conformity of the cavity 102 to the support member 1 specifically means that the two maintain consistency in their orientation and outline. The cavity 102 corresponding to the cylindrical portion of the support's outer periphery is also cylindrical. Similarly, the inner wall of the cavity 102 at the location where the guide surface 101 is provided on the support member 1 is also shaped according to the guide surface 101. If the guide surface 101 is elliptical, then the corresponding inner wall of the cavity 102 is also an elliptical concave surface; if the guide surface 101 is spherical, then the corresponding inner wall of the cavity 102 is a spherical concave surface. This ensures that the cavity 102 closely fits the shape of each part of the support member 1, achieving specific functional requirements.

[0041] In addition to being elliptical or spherical, the guide surface 101 can also be frustum-shaped. In this case, the edge of the smaller diameter end of the frustum should be rounded to further prevent damage to the core structure during the insertion of the support member 1 into the through hole. As for the height of the guide surface 101 in the frustum shape, it can be determined according to the support requirements of the support member 1.

[0042] When a cylindrical battery is injected with electrolyte in an inverted manner, the negative terminal of the battery faces upwards, the open end of the support member 1 faces downwards, and the guide surface 101 faces upwards. During the electrolyte injection process, the guide surface 101 guides the electrolyte, thereby improving its flow and wetting efficiency. During injection, some electrolyte flows into the cavity 102 of the support member 1. After injection, the cylindrical battery is repositioned so that the positive terminal faces upwards. The electrolyte in the cavity 102 then flows into the bottom of the cavity 102 and out through the drain hole, preventing electrolyte residue from remaining in the cavity 102 and causing poor wetting of the cylindrical battery.

[0043] In a preferred embodiment, the diameter d of the drain hole satisfies: 0.15mm ≤ d ≤ 0.45mm. Here, a drain hole diameter d between 0.15 and 0.45mm facilitates the outflow of electrolyte from the cavity 102 and helps prevent damage to the winding core at the drain hole. If the drain hole diameter is less than 0.15mm, the electrolyte outflow from the cavity 102 will be poor; if the drain hole diameter is greater than 0.45mm, it will damage the winding core, thus affecting the performance of the cylindrical battery. Specifically, the drain hole diameter d can be, for example, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, or 0.45mm.

[0044] As shown in Figure 1, the drain hole in this embodiment includes a first drain hole 1011 extending axially along the support member 1, and a plurality of second drain holes 1012 spaced circumferentially along the first drain hole 1011. The first drain hole 1011, extending axially along the support member 1, provides a main flow channel for the electrolyte. The plurality of second drain holes 1012, spaced circumferentially, cooperate with the first drain hole 1011 to improve the efficiency of electrolyte discharge from the cavity 102 into the support member 1. After the cylindrical battery is repositioned with the positive terminal facing upwards after electrolyte injection, the electrolyte in the cavity 102 can be discharged through the first drain hole 1011 and the plurality of second drain holes 1012, thereby improving the electrolyte wetting effect.

[0045] It should be noted that in this embodiment, only the first drain hole 1011 or the second drain hole 1012 may be provided, and the number of the second drain holes 1012 can be increased or decreased according to the usage requirements.

[0046] In this embodiment, by forming an elliptical or spherical guide surface 101 at one end of the support member 1, it is easier for the support member 1 to be inserted into the through hole, thereby reducing defects caused by inserting the support rib. Furthermore, by providing a drain hole on the guide surface 101, residual electrolyte at the bottom of the cavity 102 is drained, thereby improving the wetting effect of the electrolyte. Also, by setting the roundness of the guide surface 101 between 0 and 0.1, it is easier to prevent the guide surface 101 from being too sharp, which would cause the insertion end of the support member 1 to not fit tightly with the diaphragm, thus preventing the support member 1 from shaking and improving the support effect of the support member 1.

[0047] Furthermore, during the process of injecting electrolyte into the cylindrical battery in an inverted state, the electrolyte can be guided downwards by the guide surface 101, thereby improving the electrolyte injection efficiency. Moreover, by providing a conformal cavity 102 within the support member 1, the weight of the cylindrical battery can be reduced, facilitating lightweight design and reducing production costs.

[0048] Example 2

[0049] This embodiment relates to a cylindrical battery, which includes the support member 1 described in Embodiment 1.

[0050] Specifically, the cylindrical battery contains a core, which is formed by stacking and winding multiple positive electrode sheets, separators and negative electrode sheets in sequence. The support member 1 is specifically inserted into the through hole formed in the middle of the core.

[0051] In this embodiment, the cylindrical battery, by setting the support member 1 as described above, helps to improve assembly efficiency, and at the same time, the support effect of the support member 1 can also improve the performance of the cylindrical battery.

[0052] Example 3

[0053] This embodiment relates to a battery pack, which contains the cylindrical battery as described in Embodiment 2.

[0054] The battery pack described in this embodiment improves its performance by using cylindrical batteries as described above.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A support member, inserted into a through hole in the middle of the winding core of a cylindrical battery, characterized in that: One end of the support member (1) is provided with a guide surface (101), the guide surface (101) is curved, and the radial cross-sectional area of ​​the guide surface (101) gradually decreases along the direction of insertion into the through hole.

2. The support member according to claim 1, characterized in that: The guide surface (101) is elliptical or spherical; and when the guide surface (101) is spherical, the radius r and height h of the guide surface (101) satisfy: r ≥ h.

3. The support member according to claim 1, characterized in that: The roundness of the guide surface (101) is between 0 and 0.

1.

4. The support member according to any one of claims 1 to 3, characterized in that: The support member (1) has a cavity (102) arranged in a conformal shape inside. The other end of the cavity (102) passes through the support member (1) relative to the guide surface (101). The guide surface (101) is provided with a drain hole for connecting the inside and outside of the support member (1).

5. The support member according to claim 4, characterized in that: The diameter d of the drain hole satisfies: 0.15mm≤d≤0.45mm.

6. The support member according to claim 4, characterized in that: The drainage hole includes a first drainage hole (1011) extending axially along the support (1), and a plurality of second drainage holes (1012) spaced circumferentially along the first drainage hole (1011).

7. A cylindrical battery, characterized in that: The cylindrical battery is provided with a support member (1) as described in any one of claims 1 to 6.

8. A battery pack, characterized in that: The battery pack includes the cylindrical battery as described in claim 7.

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