Ceramic battery structure

Abstract

The utility model relates to the field of battery technology, and discloses a ceramic battery structure, including: a shell assembly and a battery cell, wherein the shell assembly is provided with a cavity for accommodating the battery cell, the shell assembly includes a metal cover plate, a ceramic shell, and a metal bottom plate, the ceramic shell is provided with a first opening end and a second opening end, the metal cover plate is connected and blocked by brazing to the first opening end, and the metal bottom plate is connected and blocked by brazing to the second opening end. By combining ceramic materials with brazing technology, the miniaturization and lightness of the battery structure are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a ceramic battery structure. Background Art

[0002] Traditionally, lithium batteries mainly use steel or aluminum shells as packaging containers to ensure the safety and stability of the battery cells. The metal shell not only provides the necessary physical protection, but also serves as the external connection port for the electrode.

[0003] In wearable devices or compact power systems, there are extremely strict restrictions on the space occupied by batteries. The traditional insulation connection method, that is, by adding additional insulating components (insulating rubber rings or other forms of isolation layers at the connection between the positive and negative electrodes), can effectively prevent short circuits, but it inevitably increases the size and weight of the battery, which is undoubtedly contrary to the trend of miniaturization and thinness pursued by modern electronic products. In addition, this design will introduce more assembly steps, increase manufacturing costs, and may affect the sealing performance and long-term reliability of the battery.

[0004] Furthermore, the existing technology often uses laser welding technology to connect and seal the metal cap with the metal shell. Although laser welding technology has the advantages of high efficiency and precision, welding slag is easily generated during the laser welding process, which may not only affect the welding quality, but also have an adverse effect on the battery performance. At the same time, the high temperature of laser welding places extremely high demands on the production process and production environment. These factors increase the difficulty and cost of battery production. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a ceramic battery structure.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A ceramic battery structure comprises: a shell assembly and a battery cell, wherein the shell assembly is provided with a cavity for accommodating the battery cell, the shell assembly comprises a metal cover plate, a ceramic shell, and a metal bottom plate, the ceramic shell is provided with a first open end and a second open end, the metal cover plate is connected and blocked with the first open end by brazing, and the metal bottom plate is connected and blocked with the second open end by brazing.

[0008] In one embodiment, the wall thickness of the ceramic shell is 0.3-1 mm.

[0009] In one embodiment, the thickness of the metal cover plate and / or the metal bottom plate is 0.05-0.5 mm.

[0010] In one embodiment, the metal cover plate and / or metal cover plate is made of steel.

[0011] In one embodiment, the ceramic shell is a cylindrical hollow structure, and the first opening end and the second opening end are respectively arranged at two ends of the ceramic shell.

[0012] In one embodiment, the metal cover plate and the metal bottom plate are metal discs matching the diameter of the opening end.

[0013] In one embodiment, the metal cover plate is brazed and sealed to the first opening end by means of a brazing flux, and the metal bottom plate is brazed and sealed to the second opening end by means of a brazing flux.

[0014] In one embodiment, the brazing flux is pre-coated on the first open end and / or the second open end before the brazing operation.

[0015] In one embodiment, the battery cell includes a battery cell body, a first pole lug and a second pole lug, the battery cell body has two end faces spaced apart, the first pole lug and the second pole lug are respectively led out from the two end faces, the first pole lug is welded to the metal base plate, and the second pole lug is welded to the metal cover plate.

[0016] In one embodiment, the metal cover plate and / or the metal cover plate is provided with explosion-proof grooves along the thickness direction.

[0017] Compared with the prior art, the utility model has at least the following advantages:

[0018] 1. Miniaturization and thinness: Using ceramic materials as the shell can greatly reduce the thickness and volume of the battery. Ceramic materials have high strength and good insulation, which ensures effective isolation of the positive and negative electrodes without the need for additional insulating components, thereby directly reducing the overall size and weight of the battery, which is more in line with the requirements of wearable devices and compact power systems for thinness and miniaturization.

[0019] 2. Improve production efficiency and reduce costs: The metal cover plate and the metal bottom plate are connected at the open end of the ceramic shell through brazing technology. Compared with laser welding (welding temperature is usually greater than 1000°C), its process temperature is usually much lower than laser welding (brazing temperature 400~500°C), avoiding the high temperature requirements on the production environment and equipment and reducing energy consumption. In addition, less welding slag is generated during the brazing process, which reduces the subsequent cleaning steps, improves production efficiency, and reduces the impact of residual welding slag on battery performance, thereby reducing production costs overall.

[0020] 3. Enhanced sealing performance and reliability: Ceramic materials have excellent corrosion resistance and chemical stability. Especially in high temperature, high humidity or corrosive environments, the use of ceramic shells can significantly improve the environmental adaptability and reliability of batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic structural diagram of a ceramic battery according to one embodiment of the present utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the ceramic battery.

[0024] The numbers in the figure are: 10, ceramic battery structure; 100, shell assembly; 110, metal cover plate; 120, ceramic shell; 121, first opening end; 122, second opening end; 130, metal bottom plate; 200, battery cell; 210, battery cell body; 220, first pole ear; 230, second pole ear. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0026] See also Figure 1 A ceramic battery structure (10) comprises: a shell assembly (100) and a battery cell (200), wherein a cavity for accommodating the battery cell (200) is provided in the shell assembly (100), the shell assembly (100) comprises a metal cover plate (110), a ceramic shell (120), and a metal bottom plate (130), the ceramic shell (120) is provided with a first opening end (121) and a second opening end (122), the metal cover plate (110) is connected and sealed with the first opening end (121) by brazing, and the metal bottom plate (130) is connected and sealed with the second opening end (122) by brazing.

[0027] It should be noted that the metal cover plate (110) and the metal bottom plate (130) are tightly connected to the open end of the ceramic shell (120) by brazing technology. Brazing is a low-temperature welding method that uses a low-melting-point brazing material to achieve connection without melting the parent material (ceramic and metal cover plate (110) in this example). This connection method ensures good sealing performance and avoids the damage that high temperature may cause to the ceramic material. Furthermore, the battery structure design of the utility model not only maintains the integrity of the battery structure, but also makes full use of the function of the metal bottom plate (130) and the metal cover plate (110) as electrode connection ports, avoiding the volume and weight increased by the traditional insulation method. By combining ceramic materials and brazing technology, not only the miniaturization and lightweight of the battery structure are achieved, but also significant advantages are shown in terms of improving production efficiency, reducing costs and reliability.

[0028] Furthermore, the wall thickness of the ceramic shell (120) is 0.3-1 mm.

[0029] It should be noted that thinner wall thickness directly reduces the overall weight of the battery, which is crucial for wearable devices and mobile electronic devices that pursue extreme lightness and thinness. While reducing the volume, it can also provide more space for other components or make the terminal product more compact.

[0030] Furthermore, the thickness of the metal cover plate (110) and / or the metal bottom plate (130) is 0.05-0.5 mm.

[0031] It should be noted that by setting the thickness of the metal cover plate (110) and / or the metal bottom plate (130) to 0.05-0.5 mm, the overall mass of the battery can be further reduced while maintaining structural strength and functionality, which is particularly suitable for devices with strict weight requirements, such as wearable devices, high-end smart phones, etc. At the same time, the use of thin metal plates reduces the consumption of raw materials and reduces production costs from an economic perspective.

[0032] Furthermore, the metal cover plate (110) and / or the metal cover plate (110) are made of steel.

[0033] It should be noted that steel is known for its excellent mechanical strength and toughness. Even when it is very thin (such as 0.05~0.5mm), it can maintain sufficient hardness and deformation resistance, ensuring that the battery is structurally stable and not easily damaged in various environmental conditions and usage scenarios, extending its service life; at the same time, compared with other high-performance metals such as titanium alloys or certain special alloys, the cost of steel is more economical, which is conducive to large-scale production, reducing the overall cost of batteries and improving market competitiveness; further, steel has good weldability, especially when connected to ceramics by brazing, it can form a stable metallurgical bond to ensure the reliability of the seal. Steel has good compatibility with common brazing materials, which facilitates the realization of high-quality welding processes in actual production.

[0034] For further information, see Figure 2 The ceramic shell (120) is a cylindrical hollow structure, and the first opening end (121) and the second opening end (122) are respectively arranged at two ends of the ceramic shell (120).

[0035] It should be noted that the cylindrical hollow structure maximizes the storage space of the battery cell (200) within a given volume, which helps to improve the energy density of the battery. The design of openings at both ends facilitates the insertion and fixation of the battery cell (200), simplifies the assembly process of the battery, and also facilitates automated operation during the production process, thereby improving production efficiency. At the same time, the cylindrical battery structure has mature standardized sizes in the industry (such as 18650, 21700, etc.), which is conducive to the standardized production and replacement of batteries, facilitates compatibility and upgrading between different devices, and reduces the complexity of design and production.

[0036] For further information, see Figure 1 and 2 The metal cover plate (110) and the metal bottom plate (130) are metal discs matching the diameter of the opening end.

[0037] It should be noted that the diameter of the metal disc is completely matched with the open end of the ceramic shell (120), ensuring a tight fit between the metal component and the ceramic shell (120). Combined with the brazing sealing technology, this precise fit can form a highly reliable sealing interface, effectively preventing external environmental factors (such as moisture, oxygen, and dust) from corroding the inside of the battery, thereby improving the stability and service life of the battery. At the same time, the metal disc design is simple and intuitive, and is easy to assemble automatically (no need to distinguish between the metal cover plate (110) and the metal base plate (130)), reducing the time for manual adjustment and positioning, and improving the assembly speed and accuracy on the production line. This not only reduces production costs, but also reduces human errors and improves product consistency.

[0038] Furthermore, the metal cover plate (110) is brazed and sealed to the first opening end (121) via a brazing flux, and the metal bottom plate (130) is brazed and sealed to the second opening end (122) via a brazing flux.

[0039] It should be noted that the brazing flux plays a vital role in the brazing process. It can effectively remove oxides and other contaminants on the metal surface, improve the wettability between the metal and the ceramic, and thus promote a more uniform and stronger metallurgical bond. This directly improves the strength and reliability of the welded joint and ensures the sealing performance of the battery. The brazing sealing connection method with the addition of the brazing flux not only ensures the high-quality seal between the metal cover plate (110) and the metal base plate (130) and the ceramic shell (120), but also improves the production efficiency and the overall performance of the battery by optimizing the welding process, providing strong support for the innovative design and manufacturing of the battery structure.

[0040] Furthermore, the brazing flux is pre-coated on the first opening end (121) and / or the second opening end (122) before the brazing operation.

[0041] It should be noted that pre-coating the brazing flux can remove the oxide film and other contaminants on the contact surface of ceramic and metal in advance, ensuring good wettability between metal and ceramic during welding, thereby forming a more uniform and stronger weld joint, improving the overall quality and reliability of the welded part; further, the pre-coated brazing flux can be more evenly distributed on the welding interface, effectively avoiding defects such as pores and cracks that appear during welding, which often reduce the sealing and electrical performance of the battery. The pre-coating operation helps to improve the yield rate and reduce the production of defective products.

[0042] For further information, see Figure 2 The battery cell (200) comprises a battery cell (200) body, a first pole ear (220) and a second pole ear (230); the battery cell (200) body has two end surfaces that are spaced apart; the first pole ear (220) and the second pole ear (230) are respectively led out from the two end surfaces; the first pole ear (220) is welded to the metal bottom plate (130), and the second pole ear (230) is welded to the metal cover plate (110).

[0043] It should be noted that the first pole ear (220) is directly welded to the metal base plate (130), and the second pole ear (230) is welded to the metal cover plate (110). Such a layout ensures a direct and efficient current conduction path, reduces internal resistance, and is beneficial to improving the charging and discharging efficiency and overall performance of the battery. At the same time, the pole ears are respectively led out through the end faces on both sides and correspondingly welded to the metal cover plate (110) and the base plate, thereby maintaining the symmetry of the internal structure of the battery, balancing the pressure distribution inside the battery, reducing deformation and internal stress concentration problems caused by structural asymmetry, and improving the stability and service life of the battery. Furthermore, the design simplifies the electrical connection steps between the battery cell (200) and the shell assembly (100), and the welding points are clear, which facilitates the implementation of precise welding on an automated production line, reduces the uncertainty caused by manual operation, and improves production efficiency and consistency of welding quality.

[0044] Furthermore, the metal cover plate (110) and / or the metal cover plate (110) is provided with explosion-proof grooves along the thickness direction.

[0045] It should be noted that the explosion-proof groove, as a preset weak area, can break first when the internal pressure of the battery increases abnormally (such as overcharging, internal short circuit, etc.), quickly release the internal gas, and avoid the risk of the battery shell being ruptured or exploded as a whole. The depth, length, shape and layout of the explosion-proof groove can be customized according to the specific size, intended use and safety standards of the battery.

[0046] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A ceramic battery structure, characterized in that: include: A shell assembly and a battery cell, wherein a cavity for accommodating the battery cell is provided in the shell assembly, the shell assembly comprises a metal cover plate, a ceramic shell, and a metal bottom plate, the ceramic shell is provided with a first open end and a second open end, the metal cover plate is connected and blocked with the first open end by brazing, and the metal bottom plate is connected and blocked with the second open end by brazing.

2. The ceramic battery structure according to claim 1, characterized in that: The wall thickness of the ceramic shell is 0.3-1 mm.

3. The ceramic battery structure according to claim 1, characterized in that: The thickness of the metal cover plate and / or the metal cover plate is 0.05-0.5 mm.

4. The ceramic battery structure according to claim 3, characterized in that: The metal cover plate and / or metal bottom plate are made of steel.

5. The ceramic battery structure according to claim 1, characterized in that: The ceramic shell is a cylindrical hollow structure, and the first opening end and the second opening end are respectively arranged at two ends of the ceramic shell.

6. The ceramic battery structure according to claim 5, characterized in that: The metal cover plate and the metal bottom plate are metal discs matching the diameter of the opening end.

7. The ceramic battery structure according to claim 1, characterized in that: The metal cover plate is brazed and sealed to the first opening end through a brazing flux, and the metal bottom plate is brazed and sealed to the second opening end through a brazing flux.

8. The ceramic battery structure according to claim 7, characterized in that: The brazing flux is pre-coated on the first opening end and / or the second opening end before the brazing operation.

9. The ceramic battery structure according to claim 1, characterized in that: The battery cell comprises a battery cell body, a first pole lug and a second pole lug. The battery cell body has two end faces spaced apart from each other. The first pole lug and the second pole lug are respectively led out from the two end faces. The first pole lug is welded to the metal bottom plate, and the second pole lug is welded to the metal cover plate.

10. The ceramic battery structure according to claim 1, characterized in that: The metal cover plate and / or the metal cover plate is provided with explosion-proof grooves along the thickness direction.

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