Battery cell central tube, battery cell winding equipment, battery and electric equipment
By designing a battery cell center tube threaded to the reel during winding, the problem of damage to the battery cell when the battery cell center tube is inserted is solved, preventing core draw and collapse, and improving the yield rate and cycle reliability of the battery.
Patent Information
- Application Number
- CN202420524351.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-18
AI Technical Summary
In the prior art, the battery cell center tube is easily damaged after being inserted into the battery cell, resulting in core pulling and collapse, affecting the cycle reliability and yield of the battery.
A central tube of the battery cell is designed, and its tube body is threaded to the needle during winding and is fixed by a threaded structure to avoid damage to the battery cell during insertion, and to support the battery cell through a hollow structure to prevent collapse.
It effectively prevents the core pulling and collapse of the battery cell, improves the yield rate and cycle reliability of the battery, reduces costs, and improves the performance and safety of the battery.
Smart Images
Figure CN222619823U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery core central tube, a battery core winding device, a battery and an electrical device. Background Art
[0002] With the development of the new energy industry, cylindrical lithium-ion batteries have broad application prospects in civil, aviation, aerospace and other fields due to their high production efficiency and strong reliability.
[0003] The cells of cylindrical lithium-ion batteries are usually wound by the winding needle of the winding equipment. After the winding is completed, the cells are separated from the winding needle. Due to the existence of the winding needle, a cavity is formed inside the cell. During the use of cylindrical lithium-ion batteries, multiple lithium ion deintercalation reactions will occur, and the internal materials will also age over time. This causes the entire cell to deform and collapse when the cylindrical lithium-ion battery is cycled a certain number of times, which in turn affects the overall electrochemical performance and even causes safety problems due to short circuits.
[0004] In order to improve the cycle reliability of cylindrical lithium-ion batteries, some batteries in the prior art have a central tube in the cavity of the battery cell to play a supporting role. However, such a central tube is usually inserted into the battery cell after the battery cell is wound. During the process of inserting the central tube into the battery cell, the central tube is easy to damage the battery cell. Utility Model Content
[0005] To this end, the technical problem to be solved by the utility model is to overcome the problem that the existing center tube is easily damaged when inserted, and to provide a battery center tube, battery winding equipment, battery and electrical equipment that can effectively prevent core pulling and collapse, improve the yield rate and save costs.
[0006] The utility model provides a battery core center tube for supporting a battery core with a winding structure, comprising a tube body, a mounting hole being opened in the tube body along a first direction, a first threaded section being opened on the hole wall surface of the mounting hole, and the first threaded section being used for being threadably connected with a winding needle during the winding process of the battery core.
[0007] In one embodiment of the present invention, the tube body is an integrated structure.
[0008] In one embodiment of the present invention, the tube body comprises a first tube body portion and a second tube body portion which are arranged opposite to each other along the tube body body's radial direction, and the first tube body portion and the second tube body portion are assembled to form the tube body.
[0009] In one embodiment of the present invention, the mounting hole is configured as a blind hole; or the mounting hole is configured as a through hole penetrating the tube body.
[0010] In an embodiment of the present invention, the first direction is parallel to the axial direction of the tube body, and the mounting hole is coaxially arranged with the tube body.
[0011] In one embodiment of the utility model, the mounting hole is a through hole that penetrates the tube body. Along the length direction of the tube body, the length of the tube body is L1, and the length of the first threaded segment is L2, satisfying the relationship: L2=K*L1, and the value range of K is 0.5~0.8.
[0012] The utility model also provides a battery cell winding device, comprising a winding needle, on which a second threaded section is provided; and a battery cell center tube as described in any one of the above items, wherein the winding needle axially penetrates into the mounting hole and is threadedly connected to the tube body; wherein the winding needle drives the tube body to rotate, and the battery cell is formed by winding on the tube body.
[0013] In an embodiment of the present invention, the material of the first thread segment and the second thread segment is non-metallic material.
[0014] The utility model also provides a battery, comprising a battery cell prepared by the battery cell winding device described in any one of the above.
[0015] The utility model also provides an electrical device, comprising any one of the batteries described above.
[0016] The above technical solution of the utility model has the following beneficial effects compared with the prior art:
[0017] The battery core center tube described in the utility model, firstly, the tube body is wound into the battery core together with the winding needle, avoiding the risk of damaging the battery core by inserting after winding is completed, and the process is simple and easy to implement. The first threaded section is threadedly connected to the winding needle, and the threaded structure effectively realizes the fixation of the tube body during the winding process, preventing the tube body and the winding needle from moving relative to each other, and ensuring the high winding quality of the battery core. Secondly, the tube body contacts the battery core, avoiding the direct contact of the diaphragm of the battery core with the winding needle, and preventing the core pulling phenomenon when the winding needle is withdrawn, thereby improving the yield rate and saving the cost of core pulling and scrapping. In addition, the tube body can adapt to thinner diaphragms, thereby improving the performance and capacity of the battery. Finally, the hollow structure of the tube body has good structural strength and bending resistance, which can effectively prevent the collapse of the battery core, offset the stress of the battery core deforming internally, and reduce the space for the battery core to expand internally. It can effectively reduce the deformation and wrinkling of the battery core during the cycle process, thereby ensuring the safety of the battery and reducing the probability of accidents. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:
[0019] Figure 1 This is one of the structural schematic diagrams of the central tube of the battery core in the preferred embodiment of the utility model;
[0020] Figure 2 This is one of the cross-sectional structural schematic diagrams of the central tube of the battery core in the preferred embodiment of the utility model;
[0021] Figure 3 This is the second schematic diagram of the cross-sectional structure of the central tube of the battery core in the preferred embodiment of the utility model;
[0022] Figure 4 This is one of the schematic diagrams of the size relationship of the central tube of the battery core in the preferred embodiment of the utility model;
[0023] Figure 5 This is the second structural schematic diagram of the central tube of the battery core in the preferred embodiment of the utility model;
[0024] Figure 6 This is the third schematic diagram of the cross-sectional structure of the central tube of the battery core in the preferred embodiment of the utility model;
[0025] Figure 7 This is the fourth schematic diagram of the cross-sectional structure of the central tube of the battery core in the preferred embodiment of the utility model;
[0026] Figure 8 This is the second schematic diagram of the size relationship of the central tube of the battery core in the preferred embodiment of the utility model;
[0027] Fig. 9 A schematic diagram of the structure of the winding needle in the preferred embodiment of the utility model;
[0028] Fig.10 This is a schematic cross-sectional view of the winding needle in the preferred embodiment of the utility model;
[0029] Fig.11 It is a schematic diagram of the structure of the battery cell in the preferred embodiment of the utility model.
[0030] Explanation of the reference numerals in the specification: D1, first direction; 10, tube body; 11, mounting hole; 111, first threaded section; 121, first tube body portion; 122, second tube body portion; 20, winding needle; 21, second threaded section; 30, battery cell. DETAILED DESCRIPTION
[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0032] Reference Figure 1As shown, the utility model discloses a battery core central tube for supporting a battery core 30 of a winding structure. Specifically, the battery core central tube includes a tube body 10. A mounting hole 11 is provided in the tube body 10 along a first direction D1, and a first thread segment 111 is provided on the hole wall surface of the mounting hole 11. The first thread segment 111 is used for threaded connection with the winding needle 20 during the winding process of the battery core 30.
[0033] During winding, the tube body 10 is threadedly connected with the winding needle 20 to realize the winding of the battery core 30. After the winding is completed, the winding needle 20 is rotated in the opposite direction to withdraw from the tube body 10, while the tube body 10 remains inside the battery core 30.
[0034] The battery core center tube described in the utility model, firstly, the tube body 10 is wound into the battery core 30 together with the winding needle 20, avoiding the risk of damaging the battery core 30 by inserting after winding is completed, and the process is simple and easy to implement. The first threaded section 111 is threadedly connected with the winding needle 20, and the threaded structure effectively realizes the fixation of the tube body 10 during the winding process, preventing the tube body 10 and the winding needle 20 from moving relative to each other, and ensuring the high winding quality of the battery core 30. Secondly, the tube body 10 contacts the battery core 30, avoiding the diaphragm of the battery core 30 from directly contacting the winding needle 20, and preventing the core pulling phenomenon when the winding needle 20 is withdrawn, thereby improving the yield rate and saving the cost of core pulling and scrapping. In addition, the tube body 10 can adapt to thinner diaphragms, thereby improving the performance and capacity of the battery. Finally, the hollow structure of the tube body 10 has good structural strength and bending resistance, which can effectively prevent the collapse of the battery core 30, offset the stress of the battery core 30 deforming internally, and reduce the space for the battery core 30 to expand internally. It can effectively reduce the deformation and wrinkling of the battery cell 30 during the cycle of the battery, thereby ensuring the safety of the battery and reducing the probability of accidents.
[0035] Those skilled in the art can set specific shapes, sizes, etc. according to actual needs. Preferably, the pipe body 10 is set to a cylindrical structure; the diameter of the pipe body 10 is set to 1 to 6 mm, the wall thickness is set to 0.5 to 1.5 mm, and the pipe length is set to 40 to 90 mm. Preferably, the thread length of the first thread segment 111 is set to 40 to 90 mm, and the thread depth is set to 0.1 to 1 mm. In addition, those skilled in the art can set specific materials according to actual needs. Preferably, the material of the pipe body 10 is set to any one of plastic, aluminum, and steel.
[0036] In some embodiments of the battery core central tube of the present invention, the tube body 10 is an integrated structure. The integrated tube body 10 has good structural strength, which is convenient for efficiently cooperating with the winding needle 20 to realize the winding of the battery core 30 during the production process. Those skilled in the art can set a specific method to produce the integrated tube body 10 according to actual needs, such as 3D printing, or CNC machining.
[0037] Further, see Figure 2 As shown, in the embodiment of the battery core center tube of the utility model, the mounting hole 11 is set as a through hole that penetrates the tube body 10. During the production process, the winding needle 20 penetrates into the tube body 10 from one end of the mounting hole 11 and passes out from the other end. The protruding part can cooperate with the clamping part of the winding needle 20 to form a support. Compared with the cantilever structure, the supported winding needle 20 can be wound better and more stably, and is particularly suitable for the production of large-sized battery cells 30.
[0038] Reference Figure 3 As shown, in some other embodiments, the mounting hole 11 can also be set as a blind hole. The blind mounting hole 11 can relatively save production time and improve production efficiency, and is particularly suitable for small-sized battery cells 30 that can be produced through a cantilever structure.
[0039] Furthermore, in the embodiment of the battery core central tube of the present invention, the first direction D1 is parallel to the axial direction of the tube body 10, and the mounting hole 11 is coaxially arranged with the tube body 10. This structure facilitates the staff to adjust parameters, thereby winding the battery core 30 better and more accurately.
[0040] Further, see Figure 4 As shown, in the embodiment of the battery core center tube described in the utility model, along the length direction of the tube body 10, the length of the tube body 10 is L1, and the length of the first thread segment 111 is L2. The relationship is satisfied: L2 = K*L1, and the value range of K is 0.5-0.8. When the value of K is too small, less than 0.5, the length of the first thread segment 111 is too short, and it is difficult to stably cooperate with the winding needle 20 to achieve fixation, which may easily cause problems such as misalignment of the pole ear. When the value of K is too large, greater than 0.8, whether the tube body 10 is installed on the winding needle 20 or the tube body 10 is unscrewed from the winding needle 20, it will take longer time, increase the process time, and reduce production efficiency. When the value of K is set to 0.5 to 0.8, the winding quality and production efficiency of the battery cell 30 can be effectively taken into account. The specific value of K can be set according to actual needs, such as 0.5, 0.6, 0.7, 0.8, etc.
[0041] Reference Figure 5As shown, in some embodiments of the battery core center tube described in the utility model, the tube body 10 includes a first tube body portion 121 and a second tube body portion 122 which are arranged opposite to each other along its own radial direction, and the first tube body portion 121 and the second tube body portion 122 are assembled to form the tube body 10. By setting the tube body 10 as a split structure, it can cooperate well with the winding needle 20 to achieve efficient winding. Specifically, during the production process, the diaphragm of the battery core 30 can be inserted from the joint of the first tube body portion 121 and the second tube body portion 122, and clamped and fixed by the winding needle 20, and then subsequent winding can be carried out, which is fast and efficient. How the winding needle 20 fixes the diaphragm belongs to the prior art, and its working principle will not be repeated. Those skilled in the art can set the specific dimensions of the first tube body portion 121 and the second tube body portion 122 according to actual needs; preferably, the first tube body portion 121 and the second tube body portion 122 are the same size to facilitate rapid positioning and production.
[0042] Further, see Figure 6 As shown, in the embodiment of the battery core center tube described in the utility model, the mounting hole 11 is set as a through hole that penetrates the tube body 10. During the production process, the winding needle 20 penetrates into the tube body 10 from one end of the mounting hole 11 and passes out from the other end. The protruding part can cooperate with the clamping part of the winding needle 20 to form a support. Compared with the cantilever structure, the supported winding needle 20 can be wound better and more stably, and is particularly suitable for the production of large-sized battery cells 30. Figure 7 As shown, in some other embodiments, the mounting hole 11 can also be set as a blind hole. The blind mounting hole 11 can relatively save production time and improve production efficiency, and is particularly suitable for small-sized battery cells 30 that can be produced through a cantilever structure.
[0043] Furthermore, in the embodiment of the battery core central tube of the present invention, the first direction D1 is parallel to the axial direction of the tube body 10, and the mounting hole 11 is coaxially arranged with the tube body 10. This structure facilitates the staff to adjust parameters, thereby winding the battery core 30 better and more accurately.
[0044] Further, see Figure 8As shown, in the embodiment of the battery core center tube described in the utility model, along the length direction of the tube body 10, the length of the tube body 10 is L1, and the length of the first thread segment 111 is L2, satisfying the relationship: L2 = K*L1, and the value range of K is 0.5 to 0.8. When the value of K is too small, less than 0.5, the length of the first thread segment 111 is too short, and it is difficult to stably cooperate with the winding needle 20 to achieve fixation, which may easily cause problems such as misalignment of the pole ear. When the value of K is too large, greater than 0.8, whether the tube body 10 is installed on the winding needle 20 or the tube body 10 is unscrewed from the winding needle 20, it will take longer time, increase the process time, and reduce production efficiency. When the value of K is set to 0.5 to 0.8, the winding quality and production efficiency of the battery cell 30 can be effectively taken into account. The specific value of K can be set according to actual needs, such as 0.5, 0.6, 0.7, 0.8, etc.
[0045] Reference Fig. 9 and Fig.10 As shown, the utility model also discloses a battery cell winding device, including a winding needle 20, on which a second threaded section 21 is provided; and the battery cell center tube described in any of the above embodiments, the winding needle 20 axially penetrates into the mounting hole 11 and is threadedly connected to the tube body 10. During the production process, the winding needle 20 drives the tube body 10 to rotate, and the battery cell 30 is wound on the tube body 10. Since the battery cell winding device described in the utility model includes the battery cell center tube described in the above embodiments, the battery cell winding device also has all the beneficial effects, which will not be repeated.
[0046] Those skilled in the art can set the specific shape, size, etc. according to actual needs. Preferably, the winding needle 20 is set to a cylindrical structure; the diameter of the winding needle 20 is set to 0.5 to 5 mm, and the length of the winding needle 20 is set to 60 to 100 mm. Preferably, the thread length of the second thread segment 21 is set to 40 to 90 mm, and the thread depth is set to 0.1 to 1 mm. Those skilled in the art can set the specific rotation mode of the winding needle 20 according to actual needs, such as setting a driving component such as a rotating cylinder or a motor. In addition, those skilled in the art can set specific winding parameters according to actual needs. Preferably, the moving shaft of the driving component drives the winding needle 20 to rotate at a speed of 5 to 10 mm / s, and enables the winding needle 20 to advance or withdraw along the thread in the pipe body 10 at a speed of 5 to 10 mm / s.
[0047] Preferably, the battery cell winding equipment further includes a fixing component, which is used to fix the battery cell 30 and the tube body 10 in the battery cell 30 after winding is completed, so as to facilitate the winding needle 20 to rotate in the opposite direction and exit the tube body 10. Specific fixing components, such as a manipulator, etc., can be provided according to actual needs. Preferably, the battery cell winding equipment further includes a clamping component of the winding needle 20, so as to cooperate with the tube body 10 of the through-hole structure. The clamping component of the winding needle 20 belongs to the prior art. By providing the clamping component of the winding needle 20, support for the winding needle 20 can be formed, so as to achieve better and more stable winding of the battery cell 30.
[0048] In some embodiments of the battery cell winding device described in the present invention, the material of the first thread segment 111 and the second thread segment 21 is a non-metallic material. By setting the thread segment of non-metallic material, even if the winding needle 20 generates debris when it is screwed in and out of the tube body 10, the debris is also a non-metallic material. The debris of the non-metallic material will not fall into the battery cell 30 and cause a short circuit in the battery, ensuring the safety performance of the battery. Different non-metallic materials can be set according to actual needs, such as ceramics, plastics, etc.
[0049] Taking the tube body 10 of an integrated structure as an example, during production, the tube body 10 is first moved to the moving axis of the winding needle 20 by a robot and aligned with the moving axis. The moving axis drives the winding needle 20 to move forward along the thread until the tube body 10 is completely covered on the winding needle 20. Subsequently, the moving axis moves the winding needle 20 and the tube body 10 to the winding position, affixes double-sided tape to the head of the diaphragm, and fixes the diaphragm with double-sided tape to the tube body 10. Then, driven by the moving axis, the diaphragm begins to be wound along the tube body 10. After the diaphragm is pre-wound, the negative electrode sheet and the positive electrode sheet also begin to be wound. After the winding is completed, the end of the battery cell 30 is fixed with tape. The wound battery cell 30 is clamped by a robot, and the moving axis drives the winding needle 20 to rotate and unscrew along the thread. After the winding needle 20 is removed, the battery cell 30 is moved to the subsequent workstation by a robot for operation.
[0050] Preferably, the diameter of the tube body 10 is 6 mm, the wall thickness is 1 mm, the length is 80 mm, the thread length is 80 mm, and the thread depth is 0.5 mm; the diameter of the winding needle 20 is 5 mm, the length is 90 mm, the thread length is 80 mm, and the thread depth is 0.5 mm; the width of the double-sided tape is 30 mm; and the driving speed of the moving axis is 10 mm / s.
[0051] Taking the split-structure tube body 10 as an example, during production, the tube body 10 is first moved to the moving axis of the winding needle 20 by a robot and aligned with the moving axis. The moving axis drives the winding needle 20 to advance along the thread until the tube body 10 is completely covered on the winding needle 20. Subsequently, the moving axis moves the winding needle 20 and the tube body 10 to the winding position, and the diaphragm is clamped by the inner winding needle. Next, driven by the moving axis, the diaphragm begins to be wound along the tube body 10, and after the diaphragm is pre-wound, the negative electrode sheet and the positive electrode sheet also begin to be wound. After the winding is completed, the end of the battery cell 30 is fixed with tape. The wound battery cell 30 is clamped by the robot, and the inner winding needle loosens the diaphragm, and the moving axis drives the winding needle 20 to rotate and unscrew along the thread. After the winding needle 20 is removed, the battery cell 30 is moved to the subsequent workstation for operation by the robot.
[0052] Reference Fig.11 As shown, the utility model further discloses a battery, comprising a battery cell 30 prepared by the battery cell winding device described in any one of the above embodiments.
[0053] The utility model also discloses an electrical device, comprising the battery described in any one of the above embodiments.
[0054] Electrical equipment may be automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Automobiles may be fuel-powered automobiles, gas-powered automobiles, or new energy automobiles. New energy automobiles may be pure electric vehicles, hybrid electric vehicles, or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the utility model do not impose any special restrictions on the above-mentioned electrical equipment.
[0055] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.
Claims
1. A battery core central tube for supporting a battery core (30) with a winding structure, characterized in that: include: A tube body (10), wherein a mounting hole (11) is provided in the tube body (10) along a first direction (D1), and a first threaded section (111) is provided on a hole wall surface of the mounting hole (11), wherein the first threaded section (111) is used for threaded connection with a winding needle (20) during the winding process of the battery cell (30).
2. The battery core central tube according to claim 1, characterized in that: The pipe body (10) is an integrated structure.
3. The battery core central tube according to claim 1, characterized in that: The tube body (10) comprises a first tube body portion (121) and a second tube body portion (122) which are arranged opposite to each other along the tube body's radial direction; the first tube body portion (121) and the second tube body portion (122) are assembled to form the tube body (10).
4. The battery core central tube according to claim 2 or 3, characterized in that: The mounting hole (11) is configured as a blind hole; or the mounting hole (11) is configured as a through hole penetrating the pipe body (10).
5. The battery core central tube according to claim 4, characterized in that: The first direction (D1) is parallel to the axial direction of the tube body (10), and the mounting hole (11) is coaxially arranged with the tube body (10).
6. The battery core central tube according to claim 5, characterized in that: The mounting hole (11) is a through hole that penetrates the tube body (10). Along the length direction of the tube body (10), the length of the tube body (10) is L1, and the length of the first threaded section (111) is L2, satisfying the relationship: L2=K*L1, and the value range of K is 0.5 to 0.
8.
7. A battery cell winding device, characterized in that: It comprises: a winding needle (20), wherein the winding needle (20) is provided with a second thread segment (21); as well as The battery core central tube according to any one of claims 1 to 6, wherein the winding needle (20) axially penetrates into the mounting hole (11) and is threadedly connected to the tube body (10); The winding needle (20) drives the tube body (10) to rotate, and the battery core (30) is formed by winding on the tube body (10).
8. The battery cell winding device according to claim 7, characterized in that: The first thread segment (111) and the second thread segment (21) are made of non-metallic material.
9. A battery, characterized in that: A battery cell (30) comprising a battery cell winding device as claimed in claim 7 or 8.
10. An electrical device, characterized in that: Comprising the battery as claimed in claim 9.