Leak-proof battery shell
By applying a UV-cured adhesive layer to the weld seam of the lithium battery casing, the problems of blind spots in the airtightness detection of lithium battery weld seams and leakage during the production process are solved, achieving higher detection accuracy and product safety.
Patent Information
- Application Number
- CN202520091871.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-15
AI Technical Summary
There are blind spots in the airtightness detection of the weld seams of lithium battery casings during high-frequency welding, and the weld seams are easily affected by compression during lithium battery production, which can lead to leakage, affecting product safety and production efficiency.
A UV-cured adhesive layer is applied to the weld seams of the battery casing. The width and length of the adhesive layer are adjustable to enhance the strength and airtightness of the weld seams and prevent leakage.
It improves the accuracy of airtightness testing of lithium battery welds, prevents welds from cracking or leaking during production, enhances product safety, and reduces costs.
Smart Images
Figure CN223842999U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to a leak-proof battery casing. Background Technology
[0002] Due to the thickness and size of the material used in the blade battery, the casing cannot be manufactured using traditional stretching processes and must be produced using high-frequency welding. High-frequency welding creates a weld seam on one side of the casing, and the quality of this weld seam (mechanical properties and airtightness) significantly impacts the product's performance.
[0003] The lithium battery manufacturing process includes a helium-based inspection step, used to test the airtightness of the laser welding between the casing and the top cover. It can also detect the sealing of the casing welds and the top cover terminals. Normally, most airtightness anomalies (including casing weld abnormalities and top cover terminal sealing abnormalities) can be detected through helium-based inspection. However, in actual testing, there are some common blind spots or difficulties. These blind spots may lead to incomplete or misjudged airtightness testing. For example, during the welding process, poor welding quality or uneven application of sealant may result in localized poor airtightness, defects that may be difficult to detect in routine testing.
[0004] Meanwhile, the extrusion process during lithium battery production can affect the mechanical properties and airtightness of the welds. In extreme cases, this can lead to weld leaks, compromising battery safety. Furthermore, it can impact production efficiency, causing battery downgrades or scrapping, and increasing costs. Utility Model Content
[0005] To solve at least one technical problem of the prior art, the present invention provides a leak-proof battery housing.
[0006] To achieve the above-mentioned utility model objectives, the technical solution adopted by this utility model is: a leak-proof battery casing, including a battery casing body, wherein one side of the battery casing body has a weld seam, and the leak-proof battery casing further includes an adhesive layer covering the weld seam, wherein the width of the adhesive layer is W0, W0 = 3mm to 0.85W, where W is the width of the side of the battery casing body having the weld seam.
[0007] Furthermore, the width of the adhesive layer is L0, L0 = L - 4mm, where L is the length of the side of the battery casing body with the weld.
[0008] Furthermore, the thickness H of the adhesive layer is ≤ 50 μm.
[0009] Furthermore, the adhesive layer is a UV-curable adhesive layer.
[0010] The beneficial effects of this utility model are as follows:
[0011] This invention applies an adhesive layer to the weld seam of the battery casing body. The adhesive layer strengthens the weld seam and enhances its airtightness. As a result, during the extrusion operation of the battery in the lithium battery production process, the weld seam on the battery casing body will not crack or fail to maintain its airtightness. This avoids weld seam leakage that could lead to product downgrading or scrapping, thereby improving product safety while reducing costs.
[0012] Meanwhile, the width and length of the adhesive layer can be changed according to the size of the side of the battery casing with the weld to make the adhesive layer more uniform, thereby reducing the blind zone of the battery casing airtightness test and improving the accuracy and precision of the battery casing airtightness test. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of a leak-proof battery casing according to the present invention.
[0014] Specific implementation methods
[0015] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0016] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0017] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0018] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.
[0019] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linked," and "socketing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.
[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0021] Reference Figure 1 This utility model provides a leak-proof battery housing, including a battery housing body 1, with a weld 10 on one side of the battery housing body 1. The leak-proof battery housing also includes an adhesive layer 2 covering the weld 10, the width of the adhesive layer 2 being W0, where W0 = 3mm to 0.85W, and W is the width of the side of the battery housing body 1 with the weld 10.
[0022] Furthermore, the width of the adhesive layer 2 is L0, L0 = L - 4mm, where L is the length of the side of the battery casing body 1 with the weld 10.
[0023] Furthermore, the thickness H of the adhesive layer 2 is ≤ 50 μm.
[0024] Furthermore, the adhesive layer 2 is a UV-curable adhesive layer.
[0025] During the battery casing production process, after the battery casing body 1 is welded, it is cleaned and dried. Then, a layer of adhesive 2 is evenly applied to the outside of the weld seam 10 of the battery casing body 1. After the adhesive layer 2 is evenly applied, it is cured by a UV lamp. At the same time, the width and length of the adhesive layer 2 can be changed according to the size of the side of the battery casing body 1 with the weld seam to make the adhesive layer more uniform, thereby reducing the blind zone of the battery casing airtightness test and improving the accuracy and precision of the battery casing airtightness test.
[0026] This invention applies an adhesive layer to the weld seam of the battery casing body. The adhesive layer strengthens the weld seam and enhances its airtightness. As a result, during the extrusion operation of the battery in the lithium battery production process, the weld seam on the battery casing body will not crack or fail to maintain its airtightness. This avoids weld seam leakage that could lead to product downgrading or scrapping, thereby improving product safety while reducing costs.
[0027] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A leak-proof battery casing, comprising a battery casing body (1), wherein one side of the battery casing body (1) has a weld (10), characterized in that, The leak-proof battery housing also includes an adhesive layer (2) covering the weld (10), the width of the adhesive layer (2) being W0, W0 = 3mm ~ 0.85W, where W is the width of the side of the battery housing body (1) having the weld (10).
2. The leak-proof battery casing according to claim 1, characterized in that, The width of the adhesive layer (2) is L0, L0 = L - 4mm, where L is the length of the side of the battery casing body (1) with the weld (10).
3. The leak-proof battery casing according to claim 1, characterized in that, The thickness H of the adhesive layer (2) is ≤50μm.
4. The leak-proof battery casing according to any one of claims 1 to 3, characterized in that, The adhesive layer (2) is a UV-curable adhesive layer.