Battery cell winding structure
By setting a support with reinforced texture inside the center hole of the battery cell and designing through channels and permeation holes, the problem of collapse caused by thermal expansion or impact of the battery cell winding structure is solved, thereby improving the safety and charging and discharging performance of the battery cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-04-03
AI Technical Summary
The existing cell winding structure is prone to collapse of the center hole due to thermal expansion or impact during use, which may cause electrode tearing and short circuit, resulting in insufficient safety.
A support is installed in the center hole of the battery cell. The support has reinforcing texture and passes through channels and permeation holes. The length of the support is adapted to the length of the battery cell after winding. An opening groove is provided on the inner side to be embedded into the inner end of the battery cell, which enhances the support effect and promotes electrolyte flow.
It improves the structural safety of the battery cell, prevents the collapse of the center hole, reduces the risk of electrode tearing and short circuit, maintains good charge and discharge function, and enhances the overall stability and safety of the battery.
Smart Images
Figure CN224082446U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of secondary batteries, and in particular to a cell winding structure. Background Technology
[0002] The battery cell is the core component of a battery. It is the basic unit for storing and releasing electrical energy. It can convert chemical energy into electrical energy and supply it through an external circuit. Battery cells are usually further processed into batteries, such as cylindrical rechargeable batteries, which are currently widely used in various electronic products.
[0003] Currently, battery cells mainly consist of components such as positive electrode plates, negative electrode plates, and separators. The positive electrode plates, negative electrode plates, and separators are stacked and arranged, and the battery is wound to meet the requirements for cell placement and transportation. Among them, the more common winding method is to use a winding needle to wind the positive electrode plates, negative electrode plates, and separators into a cylindrical structure, and then perform steps such as casing and tab welding on the battery cell to produce the battery.
[0004] However, the current cell winding structure still has insufficient safety issues. When winding the battery, a central hole is formed in the middle of the cell, and one side of the cell, as the starting point of winding, is located at this central hole. If the battery generates a lot of heat during use, it will cause volume expansion, and the cell side chamber located in the central hole will deform or even collapse and split, which may cause the electrode to tear and short circuit. Therefore, further improvements are still needed. Utility Model Content
[0005] To improve the safety of battery cells, this application provides a battery cell winding structure.
[0006] The battery cell winding structure provided in this application adopts the following technical solution:
[0007] A battery cell winding structure includes a battery cell body, the battery cell body being wound up, the battery cell body having a central hole in the middle, and a support member located inside the central hole, the support member abutting against the inner wall of the central hole, the support member having reinforcing textures.
[0008] By adopting the above technical solution, the support component can have a good support effect under the support of the reinforced texture. At this time, the support component located in the central hole can play a role in supporting the battery cell body. When the battery cell body is heated and expanded or subjected to impact and compression, the central hole is not easy to collapse, which makes the inner end of the battery cell body not easy to tear or puncture, and the battery cell is not easy to short circuit, thus optimizing and improving the structural safety.
[0009] Preferably, the support is a pillar, the length of the support is not less than the length of the battery cell body after winding, and the middle of the support has a channel that passes through both ends.
[0010] By adopting the above technical solution, the pillar-shaped support can be well adapted to the winding contour of the battery cell, thereby providing solid support for the central hole. In addition, the channel located inside the support facilitates the flow of electrolyte and helps the battery maintain good charging and discharging functions.
[0011] Preferably, the support member is further provided with an opening groove, the opening groove is connected to the channel, and the inner end of the battery cell body is embedded in the opening groove.
[0012] By adopting the above technical solution, the inner end of the battery cell body is embedded into the opening groove, which can position the inner end of the battery cell body, thereby reducing the possibility of the inner end of the battery cell body shifting. The battery cell body and the support are more closely matched, and the structural stability is optimized and improved.
[0013] Preferably, the inner end of the battery cell body is provided with an extension portion, and the battery cell body is embedded into the opening groove through the extension portion.
[0014] By adopting the above technical solution and embedding the extension into the opening groove, excessive bending of the cell body can be avoided, thereby reducing the possibility of cracking due to excessive bending of the cell body, and the structural safety is further optimized and improved.
[0015] Preferably, the support member is provided with a plurality of permeation holes, which are respectively connected to the channel and the central hole.
[0016] By adopting the above technical solution, the permeation holes can facilitate the flow of electrolyte, and the charging and discharging function of the battery cell body is further optimized and improved.
[0017] Preferably, the reinforcing texture includes raised ridges disposed on the surface of the support member, the raised ridges extending from one end of the support member to the other end.
[0018] By adopting the above technical solution, the protruding ridges extending along the length of the support can enhance the structural strength of the support, making it less prone to bending or breaking, and thus optimizing and improving the structural stability.
[0019] Preferably, the reinforcing texture consists of multiple lines, which are spaced apart along the circumference of the support member.
[0020] By adopting the above technical solution, multiple reinforcing grooves can provide support for the support component from multiple directions, thereby further improving the support effect of the support component.
[0021] Preferably, the reinforcing texture is located on the inner side of the support member.
[0022] By adopting the above technical solution, the reinforcing texture is set on the inside of the support, which can prevent the reinforcing texture from lifting the battery cell body and thus avoid increasing the overall size of the battery cell, thereby meeting the compactness requirement of the battery cell body.
[0023] In summary, this application includes at least one of the following beneficial technical effects:
[0024] 1. The support component has good support performance under the effect of the reinforcing texture. On this basis, by setting the support component at the center hole of the battery cell body, the support component body is supported. When the battery cell body is heated and expanded or subjected to impact and compression, the center hole is not easy to collapse. This makes the inner end of the battery cell body not easy to tear or puncture, and the battery cell is not easy to short circuit. The structural safety is optimized and improved.
[0025] 2. The channels running through both ends of the support and the permeation holes running through the inner and outer sides of the support facilitate the flow of electrolyte, which helps the battery maintain good charging and discharging functions.
[0026] 3. The opening slots on the support allow the inner end of the battery cell to be positioned, resulting in a tighter fit between the battery cell and the support and good structural stability. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the battery structure in a preferred embodiment of this application.
[0028] Figure 2 This is a schematic diagram of the battery assembly relationship in a preferred embodiment of this application.
[0029] Figure 3 This is a cross-sectional view of the support member in a preferred embodiment of this application.
[0030] Figure 4 This is a cross-sectional view of the battery cell body in a preferred embodiment of this application.
[0031] Explanation of reference numerals in the attached drawings: 1. Cell body; 11. Center hole; 2. Outer shell; 3. Electrode cap; 4. Support component; 41. Channel; 42. Infiltration hole; 43. Reinforcing texture; 44. Opening groove; 5. Extension. Detailed Implementation
[0032] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.
[0033] This application discloses a battery cell winding structure.
[0034] Reference Figure 1 and Figure 2The present invention demonstrates a battery structure, which mainly includes a cell winding structure, a housing 2, and an electrode cap 3. The cell body 1 is installed inside the housing 2, and the electrode cap 3 is located at the end of the housing 2 for sealing the housing 2. The specific structure of the battery is not described in detail here. The cell winding structure mainly includes the cell body 1, which mainly includes a positive electrode sheet, a separator, and a negative electrode sheet stacked in sequence. The specific arrangement of the cell body 1 is existing technology and will not be described in detail here.
[0035] The battery cell body 1 is wound up. During the winding process, the two sides of the battery cell body 1 are first defined as the inner end and the outer end, respectively. Then, starting from the inner end, it is wound outward layer by layer to finally form a cylindrical battery cell structure. At this time, a central hole 11 is formed in the middle of the battery cell body 1, and the inner end of the battery cell body 1 is located in the central hole 11.
[0036] Reference Figure 2 and Figure 3 To prevent the inner end of the battery cell body 1 from collapsing and short-circuiting within the central hole 11, the battery cell winding structure disclosed in this embodiment also includes a support member 4. The support member 4 has reinforcing textures 43, which make the structure of the support member 4 more resilient and less prone to deformation. In a specific configuration, the support member 4 is inserted into the central hole 11, so that the support member 4 is located within the central hole 11 and abuts against the inner wall of the central hole 11.
[0037] Based on the above configuration, the support member 4 located in the central hole 11 can provide support for the battery cell body 1. When the battery cell body 1 is heated and expanded or subjected to impact and compression, the central hole 11 is not easy to collapse, which makes the inner end of the battery cell body 1 less likely to be torn or punctured, and the battery cell less likely to short circuit.
[0038] Furthermore, the structure of the support member 4 can be various. In this embodiment, the support member 4 is a pillar. Specifically, the support member 4 is a cylindrical structure. The thickness and size of the support member 4 are adapted to the diameter of the central hole 11. This allows the support member 4 to fit tightly with the battery cell body 1. At the same time, when the support member 4 is installed, the length of the support member 4 is not less than the length of the battery cell body 1 after winding, and the support member 4 is completely filled in the central hole 11. This provides overall support for the central hole 11 and has the best anti-collapse effect.
[0039] In addition, after the battery cell is placed into the battery casing 2, electrolyte needs to be injected into the casing 2 so that the electrolyte can contact the battery cell and meet the requirements for electron flow. However, if the support 4 is placed into the center hole 11 at this time, the support 4 may block a part of the battery cell body 1 from contacting the electrolyte, affecting the energy density and thus affecting the charging and discharging function of the battery.
[0040] Therefore, a channel 41 is provided at the middle position of the support member 4. Specifically, the channel 41 extends along the length of the support member 4 and passes through both ends of the support member 4. At this time, the channel 41 facilitates the flow of electrolyte and helps the battery maintain good charging and discharging functions.
[0041] Optionally, the support member 4 is also provided with a plurality of permeation holes 42. The permeation holes 42 are provided through the support member 4, and the permeation holes 42 are respectively opened on the inner and outer sides of the support member 4. At this time, the permeation holes 42 connect the channel 41 and the central hole 11, so that the electrolyte located in the channel 41 can pass through the permeation holes 42, pass through the support member 4 and flow to the battery cell body 1. The electrolyte can be further evenly circulated, and the charging and discharging function of the battery cell body 1 is further optimized and improved.
[0042] It is understandable that the specific number of permeation holes 42 can be set according to actual needs, such as ten, twenty or thirty, etc. There is no specific limitation here. Furthermore, several permeation holes 42 can be set at intervals along the length and circumferential direction of the support member 4, so as to uniformly guide the electrolyte to flow onto the cell body 1.
[0043] Reference Figure 3 To enhance the structural strength of the support member 4, in this embodiment, the reinforcing texture 43 includes a raised ridge provided on the surface of the support member 4, wherein the raised ridge is integrally connected with the support member 4 and extends from one end of the support member 4 to the other end. At this time, the raised ridge extending along the length direction of the support member 4 can enhance the structural strength of the support member 4, making the support member 4 less prone to bending or breaking.
[0044] Furthermore, the reinforcing ridges 43 are multiple, such as three, six, or eight. These multiple reinforcing ridges 43 are spaced apart along the circumference of the support member 4. In this embodiment, the specific number of reinforcing ridges 43 is not limited. In this embodiment, the specific number of reinforcing ridges 43 is four, as an example. Based on the above configuration, the multiple reinforcing ridges 43 can provide support for the support member 4 in multiple circumferential directions, and the structural strength of the support member 4 is further optimized and improved.
[0045] Optionally, the reinforcing texture 43 can be set on the outside of the support member 4 or on the inside of the support member 4. Preferably, in this embodiment, the reinforcing texture 43 is located on the inside of the support member 4. Compared with setting the reinforcing texture 43 on the outside of the support member 4, setting the reinforcing texture 43 on the inside of the support member 4 can prevent the reinforcing texture 43 from pushing up the cell body 1, thereby avoiding increasing the overall size of the cell and meeting the compactness requirement of the cell body 1.
[0046] Continue to refer to Figure 3 and Figure 4 During the process of filling the support member 4 into the center hole 11, because the cell body 1 has a certain deformation space, the support member 4 may squeeze the inner end of the cell body 1, causing the cell body 1 to become loose and not tight enough.
[0047] To overcome the above problems, an opening groove 44 is also provided on the support member 4. The opening groove 44 extends along the length direction of the support member 4 and opens at both ends of the support member 4. At the same time, the opening groove 44 penetrates the side wall of the support member 4, thereby connecting the opening groove 44 with the channel 41.
[0048] Based on the above structure, the inner end of the battery cell body 1 can be embedded in the opening groove 44 to position the inner end of the battery cell body 1. On this basis, the battery cell body 1 can be directly wound around the support member 4, which is equivalent to eliminating the process of inserting the support member 4 into the center hole 11. The processing is simpler and the processing cost is reduced. Moreover, it can ensure that the battery cell body 1 and the support member 4 fit more tightly, and the overall stability of the structure is optimized and improved.
[0049] Optionally, during the process of embedding the battery cell body 1 into the opening slot 44, since the inner end of the battery cell body 1 needs to be bent significantly after extending out of the opening slot 44, an extension portion 5 is provided at the inner end of the battery cell body 1 to avoid puncturing it. The battery cell body 1 is then embedded into the opening slot 44 through the extension portion 5. This avoids directly embedding the battery cell body 1 into the opening slot 44, achieving an obstacle avoidance effect.
[0050] It is understood that the extension portion 5 can be configured in various ways. In one embodiment, the extension portion 5 can be installed on the inner end of the cell body 1 by adhesive bonding. In another embodiment, the length of the separator can be increased separately so that the end of the separator extends outward relative to the positive and negative electrode plates, and the extended part forms the extension portion 5. In this case, the extension portion 5 can be embedded into the opening groove 44, which can also achieve the avoidance effect. In this embodiment, the specific configuration of the extension portion 5 is not limited.
[0051] The implementation principle of the battery cell winding structure in this application embodiment is as follows: by setting the support member 4 at the central hole 11 of the battery cell body 1, the battery cell body 1 is provided with support. When the battery cell body 1 is heated and expanded or subjected to impact and compression, the central hole 11 is not easy to collapse, thereby making the inner end of the battery cell body 1 less likely to be torn or punctured, the battery cell is less likely to short circuit, and the structural safety is optimized and improved.
[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. An electrode core winding structure comprising an electrode core body (1) which is wound and disposed, a center hole (11) is provided in a center portion of the electrode core body (1), characterized in that: The support (4) is located in the center hole (11), and the support (4) is in abutment with the inner wall of the center hole (11), and the support (4) has a reinforcing pattern (43) on the upper side.
2. The cell winding structure according to claim 1, characterized by: The support (4) is a support column, the length of the support (4) is not less than the length of the battery body (1) after winding, and the middle part of the support (4) is provided with a channel (41) penetrating both ends.
3. The cell winding structure according to claim 2, characterized by: The support (4) is further provided with an open slot (44), the open slot (44) is in communication with the channel (41), and the inner side end of the battery body (1) is embedded in the open slot (44).
4. The cell winding structure according to claim 3, characterized by: The inner side end of the battery body (1) is provided with an extension (5), and the battery body (1) is embedded in the open slot (44) through the extension (5).
5. The cell winding structure according to claim 2, characterized by: The support (4) is provided with a plurality of permeation holes (42), and the permeation holes (42) are respectively in communication with the channel (41) and the center hole (11).
6. The cell winding structure according to claim 2, characterized by: The reinforcing pattern (43) includes a convex rib provided on the surface of the support (4), and the convex rib extends from one end of the support (4) to the other end.
7. The cell winding structure according to claim 6, characterized by: The reinforcing pattern (43) includes a plurality of convex ribs, and the plurality of reinforcing patterns (43) are arranged along the circumference of the support (4) at intervals.
8. The cell winding structure according to claim 6 or 7, characterized by: The reinforcing pattern (43) is located on the inner side of the support (4).