Packaging shell and lithium ion battery
By setting buffers in the groove of the lithium-ion battery packaging case, the problem of liquid leakage in the lithium-ion battery case is solved, and the safety of the battery is improved.
Patent Information
- Application Number
- CN202421294012.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The existing lithium-ion battery case is prone to leakage when it collides, falls or expands the pole sheet, which poses a major safety hazard.
A buffer member is provided in the groove of the packaging shell of the lithium-ion battery, including the buffer member at the connection of the side wall and the bottom wall. Materials such as insulating tape, foam filler or silicone gasket are used to protect the four corners and side walls of the groove to prevent the copper foil from puncture or cracking.
Effectively prevent the packaging shell of the lithium-ion battery from cracking when it is punctured or collided by the copper foil stretched in the battery cell during use, reducing the risk of liquid leakage and improving safety.
Smart Images
Figure CN223245725U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a packaging shell and a lithium ion battery. Background Art
[0002] Lithium-ion batteries, a rapidly developing new generation of batteries, are widely used in portable electronic devices such as mobile phones and computers, as well as electric vehicles. As people's quality of life improves, the performance requirements for lithium-ion batteries are becoming increasingly higher. Silicon-based soft-pack batteries are gaining increasing attention due to their higher energy density and cycle performance compared to traditional graphite anode batteries.
[0003] Lithium-ion batteries typically consist of a casing, containing a cell and electrolyte. The casing plays a crucial role in protecting the entire battery. However, existing lithium-ion battery casings are simple in structure and prone to leakage in the event of a collision, drop, or expansion of the electrode, posing a significant safety hazard. Utility Model Content
[0004] The main purpose of the utility model is to provide a packaging shell, aiming to solve the problem that the shell of a lithium ion battery is prone to leakage.
[0005] To achieve the above-mentioned purpose, the present invention proposes a packaging shell for encapsulating lithium-ion battery cells, comprising a main body and a buffer member, the main body being provided with a groove for accommodating the battery cell, the groove being provided with side walls and a bottom wall, the side wall extending downward along the plane where the main body is located, the side wall being connected to the bottom wall at one end away from the main body, and the buffer member being arranged in the groove for protecting the groove.
[0006] In some embodiments, the buffer member is disposed at the connection between the side wall and the bottom wall.
[0007] In some embodiments, the buffer component covers at least four corners of the groove.
[0008] In some embodiments, the buffer member includes a first portion arranged on the bottom wall and a second portion arranged on the side wall of the groove, the distance between the first portion and the bottom edge of the groove ranges from 0.5 mm to 2 mm, and the height of the second portion is not greater than the depth of the groove.
[0009] In some embodiments, the height of the second portion is equal to the depth of the groove.
[0010] In some embodiments, the buffer member has a thickness of 10 μm to 20 μm.
[0011] In some embodiments, the buffer member is adhesive tape.
[0012] In some embodiments, the adhesive tape includes a protective layer and an adhesive layer, and the protective layer is bonded to the main body through the adhesive layer.
[0013] In some embodiments, the protective layer includes olefins, polyolefins, polyol esters, polyamides, polyurethanes, and a composite containing at least one of polyolefins, polyolefins, polyol esters, polyamides, and polyurethanes; the bonding layer includes polyolefins, polyurethanes, polyacrylates, silicones, rubbers, and a composite containing at least one of polyolefins, polyurethanes, polyacrylates, silicones, and rubbers.
[0014] The present invention further provides a lithium-ion battery, comprising a battery cell and the packaging shell described in the aforementioned embodiment, wherein the battery cell is encapsulated in the groove.
[0015] The utility model provides a buffer member in the groove of the main body of the packaging shell, so that the buffer member can protect the groove on the main body, thereby preventing the packaging shell from being punctured by the stretched copper foil in the battery cell or cracking during a collision when the lithium-ion battery is in use, resulting in corrosion or leakage of the main body, thereby reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a top view of an embodiment of the packaging shell of the utility model;
[0017] Figure 2 for Figure 1 AA cross-section diagram;
[0018] Figure 3 This is a top view of another embodiment of the packaging shell of the present invention;
[0019] Figure 4 for Figure 3 BB cross-section diagram;
[0020] Figure 5 for Figure 3 Front view of the middle buffer.
[0021] Reference numerals:
[0022] 100 , main body; 110 , groove; 111 , side wall; 112 , bottom wall; 200 , buffer member; 210 , first portion; 220 , second portion. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the schemes in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0025] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.
[0026] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.
[0027] Existing shells are usually aluminum-plastic film or metal shells. However, the aluminum-plastic film is made of a composite of aluminum foil and PP material, and its texture is relatively soft. The entire packaging material is not hard enough and can be easily punctured by the internal battery cells, causing leakage. The metal shell is sealed by welding. In the event of accidents such as collision and falling, the welds are prone to cracking, causing leakage.
[0028] The utility model provides a packaging shell for packaging lithium ion battery cells. Figure 1 and Figure 2The packaging shell includes a main body 100 and a buffer member 200. The main body 100 is configured with a groove 110, the groove 110 is used to accommodate the battery cell, the groove 110 is provided with a side wall 111 and a bottom wall 112, the side wall 111 extends downward along the plane where the main body 100 is located, and the end of the side wall 111 away from the main body 100 is connected to the bottom wall 112. The buffer member 200 is arranged in the groove 110 to protect the groove 110.
[0029] The main body 100 can be a steel shell or an aluminum-plastic film, wherein the aluminum-plastic film typically includes an aluminum layer, a polypropylene layer, and other protective or adhesive layers. As the coating material for the battery cell, the main body 100 primarily provides protection and isolation for the battery cell. Therefore, it possesses a certain structural strength and sealing properties to prevent electrolyte leakage and maintain internal battery stability. The dimensions of the main body 100 are determined by the type and model of the lithium-ion battery, but are not limited in this embodiment. The recess 110 in the main body 100 is used to accommodate the battery cell. The specific size and shape of the recess 110 are related to the capacity and size of the lithium-ion battery cell, but are not limited in this embodiment. Since the recess 110 is typically formed by die stamping, the portion of the main body 100 located at the recess 110 is inevitably stretched, resulting in weaker structural strength than other locations. This makes it susceptible to breakage when exposed to sharp corners of the copper foil inside the battery cell or in the event of external impact. Therefore, a buffer member 200 is provided within the recess 110 to protect the packaging shell.
[0030] As a corner protection structure, the buffer 200 typically needs to be sufficiently flexible and elastic to effectively buffer pressure and impact from the battery cell while preventing damage to the cell itself and preventing any impact on the lithium-ion battery's capacity and normal cycling. Because the buffer 200 is located inside the lithium-ion battery, it must possess certain insulation and corrosion resistance to avoid electrical issues such as short circuits. The specific placement of the buffer 200 can be selected as needed. For example, for sharp points on the battery cell, the buffer 200 can be placed where the groove 110 corresponds to the sharp point.
[0031] In this embodiment, the insulating member may be a material such as insulating tape, foam filler, or silicone gasket, and is typically adhesively bonded to groove 110. Insulating tape is a common electrical insulating material, typically composed of polyester film and adhesive, used to provide electrical insulation and protection. Because the tape itself is relatively soft and has a certain degree of ductility, it is suitable for grooves 110 of various sizes, and the appropriate tape length can be selected as needed. Compared to insulating tape, foam filler and silicone gaskets offer greater strength and protection. Furthermore, they can be designed to match the shape of groove 110, making installation more convenient.
[0032] It is worth mentioning that the buffer part 200 can be arranged at the corner of the bottom of the groove 110 after the groove 110 is constructed on the main body 100; or the buffer part 200 can be arranged on the main body 100 first, and then the groove 110 is punched out of the main body 100. At this time, higher requirements are placed on the viscosity and strength of the buffer part 200 to prevent the buffer part 200 from being damaged or falling during the stamping process, which affects its protective effect.
[0033] In this embodiment, a buffer member 200 is provided on the main body 100 of the packaging shell so that the buffer member 200 can protect the groove 110 on the main body 100, thereby preventing the packaging shell from being punctured by the stretched copper foil in the battery cell or cracking during a collision when the lithium-ion battery is in use, resulting in corrosion or leakage of the main body, thereby reducing safety hazards.
[0034] like Figure 3 and Figure 4 As shown, in some embodiments, the buffer member 200 is provided at the connection between the side wall 111 and the bottom wall 112. Specifically, the buffer member 200 can protect all four sides of the bottom of the groove 110, or only cover a part of them, which can be selected according to needs. Figure 3 For example, the buffer 200 is two insulating tapes that cover the upper and lower sides of the bottom of the groove 110. The empty left and right sides are used to place the tabs of the battery cell and the glue wrapped around the head and tail of the battery cell to prevent the package from being affected or the cathode and anode sheets from being misaligned and causing a short circuit.
[0035] like Figure 1 As shown, in some embodiments, the buffer member 200 covers at least the four corners of the groove 110. In actual use, the four corners at the bottom of the groove 110 are generally more fragile due to the effects of stamping, and lithium-ion batteries often bump into the corners. Therefore, the buffer member 200 is controlled to cover at least the four corners of the groove 110 to fully utilize the protective function of the buffer member 200.
[0036] like Figure 1-Figure 5As shown, in some embodiments, the buffer member 200 includes a first portion 210 disposed on the bottom wall 112 and a second portion 220 disposed on the sidewall 111 of the recess 110. The distance between the first portion 210 and the bottom edge of the recess 110 ranges from 0.5 mm to 2 mm, and the height of the second portion 220 is no greater than the depth of the recess 110. By ensuring that the distance between the first portion 210 and the bottom side edge is greater than 0.5 mm, the four corners of the recess 110 are fully protected, preventing partial areas from being underprotected. The width of the first portion 210 is controlled to be no greater than 2 mm to prevent the first portion from covering an excessively large area and affecting the battery thickness. Preferably, in this embodiment, the width of the first portion 210 is 1 mm, which facilitates installation, effectively protects the corners, and avoids negatively impacting the battery thickness. The height of the second portion 220 is no greater than the depth of the recess 110. This prevents the buffer member 200 from protruding from the top of the recess 110, thereby preventing it from interfering with the proper packaging of the battery cells or increasing the overall thickness of the battery. At the same time, it ensures that the buffer member 200 can effectively play a protective role when an impact occurs. Preferably, the height of the second portion 220 is controlled to be greater than 0.1 mm to ensure that the diagonal position has sufficient protection.
[0037] In some embodiments, the height of the second portion 220 is equal to the depth of the recess 110. Different sizes of recess 110 are required for different types and models of lithium-ion batteries. By ensuring that the height of the second portion 220 is equal to the depth of the recess 110, the corners are fully protected, minimizing damage to the packaging shell.
[0038] In some embodiments, the thickness of the buffer 200 is between 10 μm and 20 μm. When the buffer 200 is 10 μm thick, its impact on cell assembly and battery thickness is almost negligible, and it can provide a certain degree of protection for the aluminum-plastic film. If the thickness is less than 10 μm, the strength of the buffer 200 is too low, and the copper foil in the cell can easily pierce the buffer 200, thereby damaging the packaging shell. When the buffer 200 is 20 μm thick, it can provide good protection. If the thickness is greater than 20 μm, the buffer 200 is too thick, which can easily affect the normal packaging of the cell and have a negative impact on the thickness of the battery.
[0039] In some embodiments, the buffer 200 comprises adhesive tape. Adhesive tape is a thin, highly insulating paper or film material commonly used in batteries. It is used to isolate and secure components within the battery, preventing short circuits and movement of battery components. Adhesive tape is typically made of cellulose or other synthetic materials and may be coated with a highly insulating glue or adhesive to ensure it adheres securely to the surface of the battery components.
[0040] For example, PET (polyethylene terephthalate) can be used as the buffer 200. PET is a common plastic material with excellent mechanical properties, chemical stability, and heat resistance. By coating one surface of the PET with an adhesive, the PET can be attached to the target surface. The adhesive is typically made of acrylic acid, acrylate, or other synthetic resins and has excellent adhesion and chemical resistance, allowing it to firmly adhere to various surfaces.
[0041] In some embodiments, the tape includes a protective layer and an adhesive layer, and the protective layer is bonded to the main body 100 via the adhesive layer. The adhesive layer covers the entire surface of the protective layer to prevent the tape from being misplaced and warping, which would affect the normal installation of the battery cell.
[0042] In some embodiments, the protective layer comprises olefin, polyolefin nitrile, polyol ester, polyamide, polyurethane, or a composite comprising at least one of polyolefin, polyolefin nitrile, polyol ester, polyamide, and polyurethane. These materials all have good mechanical and electrical insulation properties and high chemical stability.
[0043] The bonding layer includes polyolefin, polyurethane, polyacrylate, silicone, rubber, or a composite containing at least one of polyolefin, polyurethane, polyacrylate, silicone, and rubber. The above materials have good permeability and high bonding strength after polymerization.
[0044] The present invention further provides a lithium-ion battery comprising a battery cell and the packaging case described in the aforementioned embodiment, wherein the battery cell is encapsulated within a recess 110. The specific structure of the packaging case is similar to that of the aforementioned embodiment. Since the lithium-ion battery of this embodiment utilizes all the technical solutions of all the aforementioned embodiments, it at least has all the technical effects brought about by the technical solutions of the aforementioned embodiments, and therefore will not be described in detail here.
[0045] The above description is only part or preferred embodiments of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.
Claims
1. A new type of packaging shell for packaging lithium-ion battery cells, characterized in that: It includes a main body and a buffer, the main body is provided with a groove, the groove is used to accommodate the battery cell, the groove is provided with side walls and a bottom wall, the side wall extends downward along the plane where the main body is located, and one end of the side wall away from the main body is connected to the bottom wall, and the buffer is arranged in the groove to protect the groove.
2. The packaging shell according to claim 1, characterized in that The buffer component is arranged at the connection between the side wall and the bottom wall.
3. The packaging shell according to claim 2, characterized in that: The buffer component at least covers the four corners of the groove.
4. The packaging shell according to claim 3, characterized in that: The buffer member includes a first portion arranged on the bottom wall and a second portion arranged on the side wall of the groove. The distance between the first portion and the bottom edge of the groove ranges from 0.5mm to 2mm, and the height of the second portion is not greater than the depth of the groove.
5. The packaging shell according to claim 4, characterized in that: The height of the second portion is equal to the depth of the groove.
6. The packaging shell according to claim 5, characterized in that: The buffer member has a thickness of 10 μm to 20 μm.
7. The packaging shell according to any one of claims 1 to 6, characterized in that: The buffer member is adhesive tape.
8. The packaging shell according to claim 7, characterized in that: The adhesive tape includes a protective layer and an adhesive layer, and the protective layer is bonded to the main body through the adhesive layer.
9. A lithium-ion battery, characterized in that: The invention comprises a battery cell and a packaging shell according to any one of claims 1 to 8, wherein the battery cell is encapsulated in the groove.