Glue injection battery
By using the injection cavity structure formed by bending the tabs and the design of the protective plate, the problems of large space occupation and uneven injection molding at the battery head are solved, achieving efficient battery drop performance and improved energy density.
Patent Information
- Application Number
- CN202520039025.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-08
AI Technical Summary
Existing battery head protection methods increase battery size and make it difficult to precisely control injection flow, resulting in poor protection and high scrap rates, especially in small batteries.
The structure adopts a method of bending the tabs to form a first and a second injection cavity. The first injection cavity is filled first using hot melt adhesive and other materials. Combined with the design of the protective plate and the frame, the injection space distribution is optimized to improve drop performance.
While reducing the space at the top of the battery, it improves the battery's drop performance and energy density, ensures the quality of glue application, and reduces the scrap rate in production.
Smart Images
Figure CN223771293U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and more specifically, to a glue-filled battery. Background Technology
[0002] With the development of battery technology, batteries are used in many fields, which has led to higher requirements for their drop resistance. The battery head has many parts, and these parts are easily damaged when subjected to mechanical damage (such as collisions, squeezing, drops, etc.), so the battery head needs to be given special protection.
[0003] Current methods for protecting the battery head involve injecting plastic into the battery head using low-pressure injection molding. This securely connects components such as the electrode tabs to the battery body, protecting the head components in case of a drop. However, low-pressure injection molding typically requires leaving sufficient space in the battery head to ensure the plastic material is fully injected and fills the protective area. This increases the battery's volume, which is particularly detrimental for small batteries aiming for high energy density. Furthermore, precisely controlling the flow direction and uniformity of the plastic during injection molding is difficult, especially when the battery head structure is complex and the space is limited. If the plastic does not completely fill the protective area during injection molding, it may lead to insufficient protection or defects such as bubbles and voids in the finished product. This not only affects product reliability but also increases the scrap rate during production.
[0004] Therefore, there is an urgent need to invent a glue-filled battery. Utility Model Content
[0005] One of the objectives of this invention is to provide a glue-filled battery that meets the requirements for drop performance by using less space at the battery head, addressing the shortcomings of existing technologies.
[0006] To solve the above-mentioned technical problems, this application adopts the following technical solution:
[0007] A glue-filled battery is provided, including a battery cell and a glue frame surrounding the side and top of the battery cell. The top seal is provided with a tab. When the tab is bent, it forms a first glue-filling cavity with the top seal. The glue frame and the top seal enclose a second glue-filling cavity.
[0008] Specifically, it also includes a protection plate, which is disposed on the back of the battery cell. The protection plate is electrically connected to the tab and together with the tab and the top seal forms the first injection cavity.
[0009] Specifically, the electrode includes a first bending portion, a second bending portion, and a connecting portion arranged in sequence. The first bending portion and the second bending portion are formed by bending the connecting portion vertically twice in sequence at different positions toward the inside of the cell. The first glue injection cavity surrounded by the first bending portion, the second bending portion, and the connecting portion is rectangular.
[0010] Specifically, the inside of the frame is provided with ribs, which are located on both sides of the tab. The length direction of the ribs is the same as the thickness direction of the battery cell, and the ribs are equidistantly arranged in a direction perpendicular to the length of the battery cell.
[0011] Specifically, the height of the first injection cavity is less than 4mm.
[0012] Specifically, the height of the second injection cavity is less than 6mm.
[0013] Specifically, a snap-fit part is provided on one side of the top of the frame, and the snap-fit part is fixedly connected to the protective plate.
[0014] Specifically, the first and second injection cavities are filled with hot melt adhesive.
[0015] Specifically, the frame has edges on both sides in the thickness direction, the edges extend inward along the plane of the front side of the frame, and the edges extend to the battery cell in the length direction of the battery cell.
[0016] Specifically, the two sides of the frame and the edge form a stepped portion in the thickness direction, and the surface of the edge is the stepped surface of the stepped portion.
[0017] The beneficial effects of this utility model are as follows: by bending the tabs to form the first injection cavity, it is beneficial to fully fill the space of the first injection cavity after injection, which helps to fully protect the parts of the battery that are easily damaged during drops, improves the drop performance of the battery, and the bending of the tabs occupies less space at the top of the battery. Dividing the space at the top of the battery into the first injection cavity and the second injection cavity allows for step-by-step injection, which prioritizes the protection of vulnerable parts of the battery, prevents uneven pressure at the top of the battery during injection, improves the quality of injection, and improves the drop performance of the battery. Attached Figure Description
[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention. In the drawings:
[0019] Figure 1 This is one of the structural schematic diagrams of this utility model;
[0020] Figure 2 This is the second structural schematic diagram of the present invention;
[0021] Figure 3 This is the third structural schematic diagram of the present invention;
[0022] Figure 4 This is a front view of the present invention;
[0023] Figure 5 This is a schematic diagram of the present invention after glue injection;
[0024] Figure 6 This is a side view of the present invention.
[0025] Wherein: 1-battery cell; 11-top seal; 12-tab; 121-first bend; 122-second bend; 123-connector; 2-frame; 21-rib; 22-clamping part; 23-edge; 24-step; 3-first injection cavity; 4-second injection cavity; 5-protection plate. Detailed Implementation
[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application.
[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] Although this application discloses preferred embodiments as described above, it is not intended to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.
[0029] In its research on reducing battery space to improve battery energy density, the applicant discovered that reducing the injection space at the battery head may increase the probability of low-pressure injection failure, resulting in the battery's inability to meet drop resistance requirements. Low-pressure injection molding is a packaging technology that uses lower pressure to inject molten material into a mold and quickly solidify it. It achieves insulation, heat resistance, impact resistance, vibration resistance, moisture resistance, waterproofing, dustproofing, and chemical corrosion resistance through the excellent sealing and physicochemical properties of the hot-melt material, providing good protection for electronic components. This process requires controlling the flow of molten injection material to fill the cavity between the battery top seal and the frame. Reducing the space at the battery head increases the flow resistance of the molten injection material. Furthermore, reducing the head space leads to uneven pressure distribution of the injection material during injection, which may cause premature cooling, accumulation, injection marks, or poor molding quality. The injection material cannot flow smoothly, leaving some areas unfilled. When the battery is dropped, these parts are easily damaged, resulting in insufficient drop safety performance of the battery.
[0030] This application prioritizes the effectiveness of adhesive injection for easily damaged battery components through localized reinforcement, while simpler adhesive injection can be performed on less vulnerable areas, reducing the space required for adhesive injection at those locations. This approach reduces the space at the battery head while ensuring the battery's drop performance, thereby improving the battery's energy density.
[0031] like Figure 1-6As shown, this application provides a glue-filled battery, including a cell 1 and a glue frame 2 surrounding the side and top seal 11 of the cell 1. The top seal 11 is provided with tabs 12. After being bent, the tabs 12 form a first glue-filling cavity 3 with the top seal 11. The glue frame 2 and the top seal 11 enclose a second glue-filling cavity 4. When the battery is glue-filled, the first glue-filling cavity 3 can be glued first. The glue used for glue filling can be hot melt glue, epoxy resin, silicone, and other materials that meet the requirements of impact resistance, heat resistance, and sealing in battery packaging. Since the first glue-filling cavity 3 is glued first, the glue material flows into the first glue-filling cavity 3 from the beginning, thus ensuring good flowability of the glue material in the first glue-filling cavity 3, which helps the glue material to fully fill the first glue-filling cavity 3. The battery is more easily damaged in a drop. The faulty component is tab 12. The first injection cavity 3 helps to position tab 12 well, and the quality of the injection improves the protection of the battery tab 12 during drops, thus increasing the battery's drop performance. The bending of tab 12 during the formation of the first injection cavity 3 reduces the height of tab 12, which helps to reduce the head space of the battery. The bent tab 12 also forms a buffer structure, improving the drop performance of tab 12. The components in the formed second injection cavity 4 are not easily damaged, and the second injection space can be set smaller. As long as the position of the components in the second injection cavity 4 is relatively stable after injection, the drop performance of the battery can be guaranteed. This design reduces the space occupied by the injection material while ensuring the drop performance of the battery, thus increasing the energy density of the battery.
[0032] Preferably, it also includes a protection plate 5, which is disposed on the back of the cell 1. The protection plate 5 is electrically connected to the tab 12 and together with the tab 12 and the top seal 11 forms a first injection cavity 3. The protection plate 5 is used to provide overcharge protection, over-discharge protection, short circuit protection and over-temperature protection during the charging and discharging process of the battery. It can control the connection and disconnection between the battery and the external circuit. Therefore, the protection plate 5 is generally disposed on the top of the battery near the top cover. However, this method will occupy more space on the top of the battery, and it is not easy to form the first injection cavity 3 by placing the protection plate 5 on the top of the battery tab 12. After the injection material fills the first injection cavity 3, it is easy to flow out. This application makes it easier to ensure the filling of the injection material by placing the protection plate 5 on the side of the battery so that the first injection cavity 3 formed by the protection plate 5 and the tab 12 together can be more easily filled.
[0033] Preferably, the tab 12 includes a first bending portion 121, a second bending portion 122, and a connecting portion 123 arranged sequentially. The first bending portion 121 and the second bending portion 122 are formed by bending the connecting portion 123 twice vertically towards the inside of the cell 1 at different positions. The first injection cavity 3 enclosed by the first bending portion 121, the second bending portion 122, and the connecting portion 123 is rectangular. Through a reasonable bending design, the tab 12 is used to form a rectangular cavity, making the structure of the tab 12 match the structure of the battery. This not only increases the space for injection, which helps to improve the stability of injection of the tab 12, but also maintains the compactness of the battery design.
[0034] Preferably, the interior of the frame 2 is provided with ribs 21, which are located on both sides of the tab 12. The length direction of the ribs 21 is the same as the thickness direction of the cell 1. The length direction is the direction of the longer end of the rib 21, and the thickness direction is perpendicular to the plane enclosed by the frame 2. The ribs 21 are equidistantly arranged in the length direction perpendicular to the cell 1. When the injection material is injected into the second injection cavity 4, the ribs 21 can play a mechanical interlocking role after the injection material solidifies, ensuring the stable connection between the frame 2 and the cell 1 and reducing the risk of loosening or falling off due to external impact, vibration or temperature change.
[0035] Preferably, the height of the first injection cavity 3 is less than 4mm. If the height of the first injection cavity 3 is too high, the injection material entering the first injection cavity 3 may flow out again, causing instability of the first injection cavity 3.
[0036] Preferably, the height of the second injection cavity 4 is less than 6mm. If the height of the second injection cavity 4 is too large, it will not be able to increase the energy density of the battery and will reduce the fixing effect of the protruding rib 21.
[0037] Preferably, a snap-fit part 22 is provided on one side of the top of the frame 2. The snap-fit part 22 is fixedly connected to the protection plate 5 to achieve a stable connection between the protection plate 5 and the frame 2, preventing the protection plate 5 from pulling on the tab 12 when the battery is dropped. After the protection plate 5 is fixedly connected, it can provide fixation for the tab 12, which helps to improve the drop performance of the battery.
[0038] Preferably, the first injection cavity 3 and the second injection cavity 4 are filled with hot melt adhesive. By using hot melt adhesive, the first injection cavity 3 and the second injection cavity 4 can be manually injected, which is beneficial for precise injection operation.
[0039] Preferably, the adhesive frame 2 has edges 23 on both sides in the thickness direction. The edges 23 extend inward along the plane where the front of the adhesive frame 2 is located. The edges 23 extend to the battery cell 1 in the length direction. The setting of the edges 23 makes the adhesive material fixed in the thickness direction of the battery cell 1 after solidification, which improves the stability of the top of the battery and helps to improve the drop performance of the battery.
[0040] Preferably, the two sides of the frame 2 and the edge 23 form a stepped portion 24 in the thickness direction, and the surface of the edge 23 is the stepped surface of the stepped portion 24. By setting the edge 23 as a step, the edge 23 has a higher height, which allows more glue material to be used during glue injection to ensure that the parts such as the tab 12 and rib 21 on the top of the battery can be well covered in the thickness direction of the cell 1 and to provide higher strength.
[0041] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be protected within the scope of the appended claims.
Claims
1. A gel-filled battery, characterized by: The battery cell (1) and the rubber frame (2) surrounding the side and top seal (11) of the battery cell (1), the top seal (11) is provided with a tab (12), the tab (12) is bent to form a first glue cavity (3) with the top seal (11), the rubber frame (2) and the top seal (11) form a second glue cavity (4).
2. The gelled cell of claim 1, wherein: It also includes a protective plate (5) arranged on the back of the battery cell (1), the protective plate (5) is electrically connected with the tab (12) and forms the first glue cavity (3) with the tab (12) and the top seal (11).
3. The gelled cell of claim 1, wherein: The tab (12) includes a first bending part (121), a second bending part (122) and a connecting part (123) arranged in sequence, the first bending part (121) and the second bending part (122) are vertically bent twice in sequence by the connecting part (123) at different positions towards the inside of the battery cell (1), and the first glue cavity (3) surrounded by the first bending part (121), the second bending part (122) and the connecting part (123) is rectangular.
4. The gelled cell of claim 1, wherein: The inside of the rubber frame (2) is provided with a convex rib (21), the convex rib (21) is arranged on both sides of the tab (12), the length direction of the convex rib (21) is the same as the thickness direction of the battery cell (1), and the convex rib (21) is equidistantly arranged perpendicular to the length direction of the battery cell (1).
5. The gelled cell of claim 1, wherein: The height of the first glue cavity (3) is less than 4mm.
6. The gelled cell of claim 1, wherein: The height of the second glue cavity (4) is less than 6mm.
7. The gelled cell of claim 2, wherein: One side of the top of the rubber frame (2) is provided with a clamping part (22), and the clamping part (22) is fixedly connected with the protective plate (5).
8. The gelled cell of claim 1, wherein: The first glue cavity (3) and the second glue cavity (4) are filled with hot melt glue.
9. The gelled cell of claim 1, wherein: Both sides of the rubber frame (2) in the thickness direction are provided with a rim (23), the rim (23) extends inward along the plane where the front surface of the rubber frame (2) is located, and the rim (23) extends to the battery cell (1) in the length direction of the battery cell (1).
10. The gelled cell of claim 9, wherein: The two side edges of the rubber frame (2) and the rim (23) form a stepped part (24) in the thickness direction, and the surface of the rim (23) is the stepped surface of the stepped part (24).