Battery cover plate assembly and battery

Abstract

The utility model relates to the battery field, discloses a battery cover plate subassembly and battery wherein the battery cover plate subassembly includes: ceramic cover plate and metal pole, ceramic cover plate is equipped with the through-hole along the thickness direction, metal pole includes lead-out portion and cylinder portion, lead-out portion and ceramic cover plate braze welding seal connection, the cylinder portion is equipped with the through-hole along the thickness direction, the metal pole is equipped with the through-hole along the thickness direction, and the metal pole is equipped with the through-hole along the thickness direction. And the column body part is used for penetrating through the through hole to be electrically connected with a battery cell tab. According to the battery cover plate assembly, the ceramic cover plate and an optimized connection mode are adopted, so that the safety, the capacity and the miniaturization of the battery are improved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery cover assembly and a battery. Background Art

[0002] In the field of battery technology, fully sealed steel case batteries are widely used due to their high capacity. Their cover components usually adopt a steel sheet composite structure, and the core components include metal cover, metal pole and several insulating parts. The metal cover and metal pole are the key structural elements of the battery, while the insulating parts play a key role in preventing short circuits between the positive and negative electrodes.

[0003] Since there are positive and negative electrodes inside the battery, if the two are in direct contact, a short circuit will result, which may cause battery damage, performance degradation, and even safety risks. Therefore, the insulation connection between the metal cover and the metal pole is particularly important. However, the presence of the insulating part will directly affect the overall thickness of the cover assembly, which is particularly critical in the design of the micro-battery structure. When designing a micro-battery, designers must consider the structure of the insulating part, as well as its connection, sealing, and assembly with other components to ensure that the battery is minimized in size while maintaining high efficiency.

[0004] In addition, in the production process of fully sealed steel case batteries, laser welding technology is usually used to connect the metal cover and the metal shell. Although laser welding technology has the advantages of high efficiency and precision, welding slag is easily generated during laser welding, which may not only affect the welding quality, but also have an adverse effect on battery performance. At the same time, the high temperature of laser welding (up to 1400°C) places extremely high demands on the production process and production environment. These factors increase the difficulty and cost of producing fully sealed steel case batteries. Summary of the invention

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a battery cover assembly and a battery.

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

[0007] A battery cover plate assembly comprises: a ceramic cover plate and a metal pole, wherein the ceramic cover plate is provided with a through hole along the thickness direction, the metal pole comprises a lead-out portion and a column portion, the lead-out portion is brazed and sealed to the ceramic cover plate, and the column portion is used to penetrate the through hole and electrically connect to the battery cell tab.

[0008] In one embodiment, the lead-out portion is disposed on a side of the ceramic cover plate away from the battery cell.

[0009] In one embodiment, the thickness of the ceramic cover plate is 0.1-1.0 mm.

[0010] In one embodiment, the metal pole is a T-shaped structure, wherein the diameter of the lead-out portion is 1.2 to 2 times the diameter of the column portion.

[0011] In one embodiment, the diameter of the lead-out portion is 0.5 to 0.9 times the diameter of the ceramic cover plate.

[0012] In one embodiment, the lead-out portion has a thickness of 0.05-0.2 mm.

[0013] In one embodiment, the lead-out portion is brazed to the ceramic cover plate via a brazing agent.

[0014] A battery comprises a metal bottom shell, a battery cell and a battery cover plate assembly as described in any one of the above items, wherein the metal bottom shell is provided with an open end, the battery cell is accommodated in the metal bottom shell, and the battery cover plate assembly is used to seal the open end, wherein the ceramic cover plate is brazed and sealed to the metal bottom shell.

[0015] In one embodiment, the ceramic cover plate is brazed to the open end of the metal bottom shell by a brazing agent.

[0016] In one embodiment, the battery cell includes a battery cell body, a first pole lug and a second pole lug, the first pole lug and the second pole lug are respectively led out from two end surfaces of the battery cell body, the first pole lug is welded to the metal bottom shell, and the second pole lug is welded to the metal pole.

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

[0018] 1. Improve safety performance: By using a ceramic cover to replace the traditional metal cover, this application achieves a better insulation effect. The ceramic material itself has excellent insulation properties and can effectively isolate the direct contact between the positive and negative electrodes, thereby avoiding the risk of short circuit and significantly improving the safety of the battery.

[0019] 2. Thinness: Due to the high strength and high insulation of ceramic materials, this application can reduce the use of traditional insulating parts, thereby reducing the overall thickness of the cover assembly. This is particularly important for micro-battery design because it helps to further reduce the battery volume and meet the demand for thinness and lightness of modern electronic devices.

[0020] 3. Reduce production costs and difficulty: By avoiding the use of laser welding technology, this application reduces the generation of welding slag and reduces the high requirements for production processes and production environment, thereby simplifying the production process and reducing production costs. At the same time, since the temperature requirements of brazing technology are relatively low, the impact on materials and battery performance is smaller, and the loss of production equipment is also reduced accordingly, further saving maintenance costs.

[0021] 4. Improve battery stability: The corrosion resistance of ceramic materials enables the cover assembly to maintain structural stability during long-term use, reducing battery performance degradation or safety risks caused by material corrosion; at the same time, ceramic materials have excellent thermal stability and can maintain stable performance in high temperature environments, which helps the battery to extend its service life and maintain stable performance under high load or high temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 This is a schematic cross-sectional structure diagram of a battery cover assembly according to an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of a battery according to one embodiment of the utility model;

[0025] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the battery.

[0026] The numbers in the figure are: 10, battery; 100, battery cover assembly; 110, ceramic cover; 111, through hole; 120, metal pole; 121, lead-out portion; 122, column portion; 200, metal bottom shell; 210, open end; 300, battery cell; 310, battery cell body; 320, first pole ear; 330, second pole ear. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figure 1 A battery cover plate assembly (100) comprises: a ceramic cover plate (110) and a metal pole (120), wherein the ceramic cover plate (110) is provided with a through hole (111) along the thickness direction, and the metal pole (120) comprises a lead-out portion (121) and a column portion (122), wherein the lead-out portion (121) is brazed and sealed to the ceramic cover plate (110), and the column portion (122) is used to penetrate the through hole (111) to be electrically connected to the pole ear of the battery cell (300).

[0029] It should be noted that the combination of the ceramic cover plate (110) and the metal pole (120) makes full use of the high insulation of ceramics and the excellent conductivity of metals. This material combination not only ensures the safety of the battery (10), but also ensures the working efficiency of the battery. Compared with the traditional connection method, the brazing connection is simpler and faster, which not only improves the production efficiency but also reduces the error rate in the assembly process. At the same time, the battery cover plate assembly (100) provided by the utility model has a simple structure and a reduced overall thickness. The battery cover plate assembly (100) provided by the utility model can increase the battery capacity compared with traditional batteries of the same size.

[0030] See also Figure 1 Furthermore, the lead-out portion (121) is arranged on a side of the ceramic cover plate (110) away from the battery cell (300).

[0031] It should be noted that during the battery assembly process, the lead-out portion (121) can be used as a welding point to connect with other battery cells or a battery management system (BMS). By welding, the stability and reliability of the electrical connection between the cells in the battery pack can be ensured. In addition to being used for internal connections in the battery pack, the lead-out portion (121) can also be directly connected to an external device (such as a motor, a charger, etc.). This design makes the access and use of the battery more flexible and convenient, meeting the needs of different application scenarios.

[0032] Furthermore, the thickness of the ceramic cover plate (110) is 0.1-1.0 mm.

[0033] It should be noted that, although ceramic materials have excellent insulation and stability, they are also brittle. Therefore, selecting a suitable thickness is crucial to ensure the mechanical strength and impact resistance of the ceramic cover plate (110). The thickness of the ceramic cover plate (110) is controlled within the range of 0.1 to 1.0 mm, which is the result of comprehensive consideration of multiple aspects such as lightweight, space saving, thermal conductivity, cost optimization, safety and reliability. Such a design allows the battery cover plate assembly (100) to meet the basic functions while also meeting the requirements of modern electronic equipment for high performance, high efficiency and high reliability.

[0034] See also Figure 1 Furthermore, the metal pole (120) is a T-shaped structure, wherein the diameter of the lead-out portion (121) is 1.2 to 2 times the diameter of the column portion (122).

[0035] It should be noted that the metal pole (120) is designed as a T-shaped structure, and the characteristic of this structure is that a wider lead-out portion (121) is formed at the upper end of the column portion (122). The design of the T-shaped structure enables the metal pole (120) to exert greater bending and shear resistance when bearing loads. This structural form is conducive to ensuring the structural stability of the entire cover plate assembly, especially when subjected to external forces, and can effectively resist deformation and damage.

[0036] At the same time, the diameter of the lead-out portion (121) is 1.2 to 2 times the diameter of the column portion (122). Firstly, the area of ​​the lead-out portion (121) is increased so that during the welding process, the solder joint and the lead-out portion (121) are in more complete contact, which reduces the possibility of poor welding, thereby improving the efficiency and yield of the Pack. Secondly, by increasing the area of ​​the lead-out portion (121), the electrical connection is also optimized. A larger contact area means lower contact resistance, thereby reducing power loss and heat generation problems.

[0037] See also Figure 1 Furthermore, the diameter of the lead-out portion (121) is 0.5 to 0.9 times the diameter of the ceramic cover plate (110).

[0038] It should be noted that the diameter of the lead-out portion (121) is designed to be smaller than the diameter of the ceramic cover plate (110) to prevent the lead-out portion (121) from protruding from the edge of the ceramic cover plate (110), which would cause inconvenience in the brazing operation between the ceramic cover plate (110) and the metal bottom shell (200). At the same time, a reasonable diameter ratio helps to improve the utilization rate of materials. An excessively large diameter of the lead-out portion (121) may result in material waste, while an excessively small diameter may affect electrical connection and mechanical stability. The ratio range of 0.5 to 0.9 times is a balance point found between material utilization and performance requirements.

[0039] Furthermore, the thickness of the lead-out portion (121) is 0.05-0.2 mm.

[0040] It should be noted that the thinner lead-out portion (121) design helps to reduce the amount of metal material used, thereby achieving material savings and lightweighting of the battery (10) system. Although the lead-out portion (121) is thinner, its design still needs to ensure sufficient mechanical strength and stability to cope with physical shock and vibration during normal use. By controlling the thickness of the lead-out portion (121) to 0.05-0.2 mm, it can be ensured that the lead-out portion (121) maintains sufficient mechanical stability while providing a good electrical connection.

[0041] Furthermore, the lead-out portion (121) is brazed and connected to the ceramic cover plate (110) via a brazing agent.

[0042] It should be noted that brazing is a welding method performed at a relatively low temperature, which helps to reduce changes in material properties and structural deformation caused by high temperature. The lead-out portion (121) and the ceramic cover plate (110) are connected by brazing. In this process, the brazing flux plays a vital role. It not only helps the lead-out portion (121) and the ceramic cover plate (110) to form a firm connection, but also ensures the conductivity and stability of the connection. The brazing flux mainly plays the role of wetting the base material and filling the weld during the welding process. It can effectively reduce the interface resistance of the welded joint and improve the conductivity of the joint. At the same time, high-quality brazing flux can also enhance the corrosion resistance of the joint and extend the service life of the battery.

[0043] See also Figure 2 and Figure 3 A battery (10) comprises a metal bottom shell (200), a battery cell (300) and a battery cover plate assembly (100) of any one of the above items, wherein the metal bottom shell (200) is provided with an open end (210), the battery cell (300) is accommodated in the metal bottom shell (200), and the battery cover plate assembly (100) is used to seal the open end (210), wherein the ceramic cover plate (110) is brazed and sealed to the metal bottom shell (200).

[0044] It should be noted that the overall design of the battery (10) provided by the utility model is compact, and the space between the metal bottom shell (200) and the battery cell (300) is efficiently utilized without redundant gaps, thereby realizing the miniaturization of the battery (10), which not only enables the battery (10) to be applied to more space-constrained devices, but also improves the energy density. Unnecessary redundant components are removed in the design, making the structure of the battery (10) more concise. This not only reduces the manufacturing cost, but also reduces potential failure points, thereby improving the reliability of the battery (10).

[0045] Among them, the ceramic cover plate (110) is an important component of the battery (10) cover plate, and its thickness is precisely controlled, which not only ensures mechanical strength and stability, but also helps to achieve the thinness and lightness of the battery (10). The thin ceramic cover plate (110) reduces the overall thickness of the battery (10), making it more suitable for the thinness and lightness requirements of modern electronic devices. Furthermore, the ceramic cover plate (110) and the metal bottom shell (200) are sealed and connected by brazing technology. This connection method not only ensures the sealing performance of the battery (10), but also reduces the thickness and weight of the connection material, further promoting the thinness and lightness of the battery (10).

[0046] Furthermore, the ceramic cover plate (110) is brazed to the open end (210) of the metal bottom shell (200) by means of a brazing agent.

[0047] It should be noted that, through the brazing agent, the ceramic cover plate (110) and the open end (210) of the metal bottom shell (200) form a very stable connection. The brazing agent will melt during the heating process and fill the gap between the ceramic cover plate (110) and the metal bottom shell (200), forming a strong joint. Through the brazing technology, the gap between the ceramic cover plate (110) and the metal bottom shell (200) is completely closed, thereby avoiding any potential leakage risk.

[0048] See also Figure 3 Furthermore, the battery cell (300) includes a battery cell (300) body, a first pole ear (320) and a second pole ear (330), wherein the first pole ear (320) and the second pole ear (330) are respectively led out from two end surfaces of the battery cell (300) body, the first pole ear (320) is welded to the metal bottom shell (200), and the second pole ear (330) is welded to the metal pole (120).

[0049] It should be noted that the battery (10) provided by the utility model has a simple connection method between the battery cell (300) and the battery (10) housing and the cover assembly, wherein the first pole ear (320) is directly welded to the metal bottom shell (200), thereby ensuring a stable electrical connection and simplifying the overall structure. The second pole ear (330) is welded to the metal pole (120), thereby also ensuring the efficiency and stability of current transmission. By directly welding the pole ear to the metal bottom shell (200) and the metal pole (120), the need for intermediate connecting components is reduced, thereby simplifying the overall structure and reducing resistance.

[0050] 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 battery cover assembly, characterized in that: include: A ceramic cover plate and a metal pole, wherein the ceramic cover plate is provided with a through hole along the thickness direction, and the metal pole comprises a lead-out portion and a column portion, wherein the lead-out portion is brazed and sealed to the ceramic cover plate, and the column portion is used to penetrate the through hole and electrically connect to the battery cell tab.

2. The battery cover assembly according to claim 1, characterized in that: The lead-out portion is arranged on a side of the ceramic cover plate away from the battery core.

3. The battery cover assembly according to claim 1, characterized in that: The thickness of the ceramic cover plate is 0.1-1.0 mm.

4. The battery cover assembly according to claim 2, characterized in that: The metal pole is a T-shaped structure, wherein the diameter of the lead-out portion is 1.2 to 2 times the diameter of the column portion.

5. The battery cover assembly according to claim 2, characterized in that: The diameter of the lead-out portion is 0.5 to 0.9 times the diameter of the ceramic cover plate.

6. The battery cover assembly according to claim 2, characterized in that: The thickness of the lead-out portion is 0.05-0.2 mm.

7. The battery cover assembly according to claim 1, characterized in that: The lead-out portion is brazed and connected to the ceramic cover plate through a brazing agent.

8. A battery, characterized in that: It comprises a metal bottom shell, a battery cell and a battery cover plate assembly as claimed in any one of claims 1 to 7, wherein the metal bottom shell is provided with an open end, the battery cell is accommodated in the metal bottom shell, and the battery cover plate assembly is used to seal the open end, wherein the ceramic cover plate is brazed and sealed to the metal bottom shell.

9. The battery according to claim 8, characterized in that The ceramic cover plate is brazed and connected to the open end of the metal bottom shell through a brazing agent.

10. The battery according to claim 8, characterized in that The battery cell comprises a battery cell body, a first pole lug and a second pole lug, wherein the first pole lug and the second pole lug are respectively led out from two end surfaces of the battery cell body, the first pole lug is welded to the metal bottom shell, and the second pole lug is welded to the metal pole.

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