Steel shell battery and electronic equipment

Abstract

The utility model relates to the field of batteries, and discloses a steel shell battery and electronic equipment, the steel shell battery comprises a shell, a cap and a cover plate, the shell comprises a top wall and a side wall, one end of the side wall is connected with the top wall, the other end of the side wall is an open end, the top wall is provided with a first through hole, and the first through hole is communicated with the cover plate. The cap is in insulated connection with the top wall and blocks the first through hole, the cover plate and the open end are sealed by laser welding, an explosion-proof line is arranged on the cover plate, and the steel shell battery can improve the safety performance and reduce the production cost.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and particularly to a steel shell battery and an electronic device. Background Art

[0002] With the progress of technology and the miniaturization trend of electronic products, as a key energy supply component, the improvement of the space utilization rate and energy density of batteries has become particularly important. Especially in microelectronic devices, the requirements for battery volume and performance are more stringent. Due to its structural stability and relatively high energy density, steel shell batteries have been widely used in various electronic products.

[0003] Laser sealing technology has been widely adopted due to its high precision and high efficiency. This technology tightly connects the battery cover plate and the shell through laser welding, thereby effectively compressing the volume of the shell and releasing more internal cavity space for electric energy storage.

[0004] However, in the structure of a micro steel shell battery, when laser welding the cover plate and the shell, since the insulating part connected to the cap is very close to the welding area, the high-temperature laser beam can easily cause the insulating part to melt due to heat, thereby destroying the safety and functionality of the battery. In addition, in order to improve the safety of the battery, an explosion-proof line is usually formed by laser grooving on the shell or the cap in the existing steel shell battery structure. The explosion-proof line is used to break in time to release pressure when the internal pressure of the battery is too high, preventing the battery from exploding. However, the traditional shell is a cylindrical groove structure, and the metal splash powder generated after laser grooving is often difficult to completely remove, which not only affects the cleanliness of the battery but also may become a safety hazard, such as causing a short circuit during the charging and discharging process of the battery.

[0005] Therefore, how to further improve the safety and functionality of micro steel shell batteries is a technical problem that needs to be solved urgently by R & D personnel in this field. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a steel shell battery and an electronic device with a new structure.

[0007] The purpose of the utility model is achieved by the following technical solutions:

[0008] A steel shell battery includes: a shell, a cap, and a cover plate. The shell includes a top wall and a side wall. One end of the side wall is connected to the top wall, and the other end of the side wall is an open end. The top wall is provided with a first through hole. The cap is insulatedly connected to the top wall and seals the first through hole. The cover plate is laser welded and sealed to the open end, and an explosion-proof line is provided on the cover plate.

[0009] In one of the embodiments, the explosion-proof line is formed by stamping technology.

[0010] In one embodiment, the explosion-proof line is a C-shaped explosion-proof line arranged around the center of the cover plate.

[0011] In one embodiment, the depth of the explosion-proof line is 0.08 - 0.12 mm.

[0012] In one embodiment, the cap includes a cap body and a lead-out terminal. The cap body is insulatingly connected to the side of the top wall close to the battery cell, and the lead-out terminal is led out from the first through hole.

[0013] In one embodiment, there is a gap between the lead-out terminal and the top wall.

[0014] In one embodiment, the cap body is insulatingly connected to the top wall through an insulating pad. The insulating pad is provided with a second through hole. The lead-out terminal passes through the second through hole and the first through hole in sequence and then is led out, and the end face of the lead-out terminal protrudes from the end face of the housing.

[0015] In one embodiment, the steel shell battery further includes a battery cell. The housing, the cap, and the cover plate enclose a cavity, and the battery cell is arranged in the cavity. The battery cell includes a battery cell body, a first pole ear, and a second pole ear. The first pole ear and the second pole ear are respectively led out from two end faces of the battery cell. The first pole ear is welded to the cover plate, and the second pole ear is welded to the cap.

[0016] In one embodiment, the second pole ear includes a starting section, an intermediate section, and a connecting section connected in sequence. One end of the starting section is connected to the battery cell body. The intermediate section is bent relative to the starting section to the end face of the battery cell body. The connecting section is bent relative to the intermediate section and then welded to the cap, and the connecting section is arranged between the cap and the intermediate section.

[0017] On the other hand, the present utility model also provides an electronic device using the above-mentioned steel shell battery.

[0018] Compared with the prior art, the present utility model has at least the following advantages:

[0019] 1. Improve the safety of the battery: effectively avoid the melting of the insulating part during the laser sealing process, reduce the risk of internal short circuit of the battery; the optimized explosion-proof line design and position selection enable the battery to quickly release pressure under extreme conditions and prevent explosion accidents.

[0020] 2. Enhanced battery functionality: By setting an explosion-proof line on the cover plate, which is a flat structure and can be set using non-laser grooving technology, it can reduce the phenomenon of metal splash during the grooving process, improve the cleanliness of the battery and the stability of long-term operation, and extend the service life of the battery.

[0021] 3. Improved battery production efficiency and cost-effectiveness: The optimized laser sealing technology and explosion-proof line design not only improve the manufacturing efficiency of the battery but also reduce the cost burden caused by material waste and increased defective rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic cross-sectional structure diagram of a steel shell battery according to an embodiment of the present utility model;

[0024] Figure 2 Schematic explosion structure diagram of a steel shell battery according to an embodiment of the present utility model.

[0025] The reference numerals in the figures are: 10, steel shell battery; 100, housing; 110, top wall; 111, first through hole; 120, side wall; 121, open end; 200, cap; 210, cap body; 220, lead-out terminal; 300, cover plate; 310, explosion-proof line; 400, insulating pad; 410, second through hole; 500, battery cell; 510, battery cell body; 511, insulating paper; 520, first tab; 530, second tab; 531, starting section; 532, middle section; 533, connecting section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To facilitate the understanding of the present utility model, the following will describe the present utility model more comprehensively with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model 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 utility model more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are only for illustrative purposes and do not represent the only implementation.

[0028] Unless otherwise defined, all technical and scientific terms used in this article have the same meaning as those commonly understood by those skilled in the technical field to which this utility model belongs. The terms used in the specification of this utility model in this article are only for the purpose of describing specific implementations and are not intended to limit this utility model. The term "and / or" used in this article includes any and all combinations of one or more of the related listed items.

[0029] Please refer to Figure 1 and Figure 2 , a steel shell battery (10), comprising: a housing (100), a cap (200) and a cover plate (300), the housing (100) includes a top wall (110) and a side wall (120), one end of the side wall (120) is connected to the top wall (110), the other end of the side wall (120) is an open end (121), the top wall (110) is provided with a first through hole (111), the cap (200) is insulatingly connected to the top wall (110) and seals the first through hole (111), the cover plate (300) is laser welded and sealed to the open end (121), and an explosion-proof line (310) is provided on the cover plate (300).

[0030] It should be noted that in the existing laser-sealed steel shell battery (10), generally one end of the steel shell is open, the cap (200) and the cover plate (300) are integrated by hot pressing (the insulating pad (400) between the cap (200) and the cover plate (300) is hot-pressed and bonded) into an integral component, and finally the integral component is covered on the open end of the steel shell, and the cover plate (300) is laser welded and sealed to the steel shell. However, in the field of micro steel shell batteries (10), the size is small, the gap between the edge of the cover plate (300) and the insulating pad (400) is small, the laser welding temperature can reach above 1300 °C, and the insulating pad (400) has the risk of melting under the influence of high temperature, which will directly cause the short circuit between the cap (200) and the cover plate (300); at the same time, in order to improve the battery safety performance, an explosion-proof structure is generally provided on the battery. Currently, the explosion-proof line (310) is generally provided on the housing (100) or the cap (200). Since the housing (100) and the cap (200) are non-planar structures, generally the laser grooving method is used. As mentioned above, laser grooving is likely to produce metal powder residues.

[0031] Based on the above, the present utility model mainly makes the following two improvements to the structure of the steel shell battery (10):

[0032] 1. The cap (200) and the cover plate (300) are respectively arranged at both ends of the housing (100). Among them, the cap (200) is insulated from the housing (100) and can be bonded by hot pressing. The cover plate (300) is connected and sealed to the open end (121) of the housing (100) by laser welding. In this way, during laser sealing, it effectively prevents the insulating part at the cap (200) end from melting due to the high-temperature laser beam, ensuring that the safety and functionality of the battery are not affected.

[0033] 2. An explosion-proof line (310) is provided on the cover plate (300). The cover plate (300) is a flat plate-like structure, and the explosion-proof line (310) can be set by non-laser grooving method, which can effectively reduce the phenomenon of metal splash during the laser grooving process, facilitate the subsequent cleaning work, and thus avoid potential safety hazards such as short circuits caused by metal powder residues.

[0034] Furthermore, the explosion-proof line (310) is formed by stamping technology.

[0035] It should be noted that no metal splash is generated during the forming process of stamping technology, avoiding the complexity and time consumption of subsequent cleaning work, and at the same time reducing the potential safety hazards caused by metal dust residues; compared with traditional laser grooving, the thermal influence on the material during stamping forming is smaller, reducing the thermal damage and deformation of the material, which not only helps to maintain the overall structural stability of the battery housing (100), but also extends the service life of the battery. At the same time, compared with laser grooving, the equipment investment of stamping technology is relatively low. In mass production, the mold cost can be effectively amortized, reducing the manufacturing cost of a single battery. Moreover, stamping technology is suitable for large-scale mass production, can quickly complete the forming of the explosion-proof line (310), significantly shortens the manufacturing cycle of the battery, and improves production efficiency.

[0036] Please refer to Figure 2 , furthermore, the explosion-proof line (310) is a C-shaped explosion-proof line (310) arranged around the center of the cover plate (300).

[0037] It should be noted that the C-shaped design increases the length of the explosion-proof line (310), which means that under the same pressure change, the explosion-proof line (310) is more likely to reach the breaking point, so that it can respond more quickly to abnormal changes in internal pressure, release pressure in time, and prevent the battery from exploding; secondly, the C-shaped explosion-proof line (310) is arranged around the center of the cover plate (300), which can make the stress evenly distributed on each part of the explosion-proof line (310) when the internal pressure of the battery rises abnormally, avoiding local stress concentration, and thus improving the stability and reliability of the explosion-proof line (310).

[0038] Furthermore, the depth of the explosion-proof line (310) is 0.08 - 0.12 mm.

[0039] It should be noted that in the field of micro steel shell batteries (10), the material thickness of the shell (100) and the cover plate (300) is usually in the range of 0.1 - 0.3 mm. The depth design of the explosion-proof line (310) needs to ensure the structural strength of the battery shell (100) while meeting the requirement of quickly responding and releasing pressure when the internal pressure rises abnormally. If the explosion-proof line (310) is too deep, it may weaken the structural strength of the shell (100) and increase the leakage risk of the battery under normal working conditions; conversely, if the groove is too shallow, it may not be able to effectively release the internal pressure when necessary, increasing the risk of battery explosion. The depth of the explosion-proof line (310) of 0.08 - 0.12 mm ensures that while maintaining the structural strength of the shell (100), when the internal pressure of the battery exceeds the safety threshold, the explosion-proof line (310) can break quickly, release pressure in time, and effectively prevent the battery from exploding.

[0040] Please refer to Figure 1 and Figure 2 Furthermore, the cap (200) includes a cap body (210) and a lead terminal (220). The cap body (210) is insulated and connected to the side of the top wall (110) close to the battery cell (500), and the lead terminal (220) is led out from the first through hole (111).

[0041] It should be noted that the cap body (210) and the lead terminal (220) are an integrally formed structure. The cap body (210) is tightly connected to the top wall of the shell (100) through an insulating material to ensure electrical isolation between the cap (200) and the shell (100) (the cap (200) is designed as the first pole of the battery, and the shell (100) and the cover plate (300) are designed as the second pole of the battery), avoiding the short-circuit risk that may be caused by direct contact between metal components. The layout design of the lead terminal (220) simplifies the connection steps between the battery and the external circuit, reducing the production cost and maintenance difficulty.

[0042] Please refer to Figure 1 Furthermore, there is a gap between the lead terminal (220) and the top wall (110).

[0043] It should be noted that the diameter of the first through hole (111) is larger than that of the lead terminal (220). A gap is naturally formed between the lead terminal (220) and the top wall, which further enhances electrical isolation and reduces the risk of short circuit. At the same time, during the use of the battery, due to temperature changes or other external forces, slight deformations may occur inside the battery. The gap between the lead terminal (220) and the top wall can serve as a stress buffer zone to reduce electrical connection failures caused by deformations. In actual production, an insulating material can also be filled in the gap to further enhance the electrical isolation between the cap (200) and the housing (100).

[0044] Please refer to Figure 1 , further, the cap body (210) is insulatedly connected to the top wall (110) through an insulating pad (400). The insulating pad (400) is provided with a second through hole. The lead terminal (220) passes through the second through hole (410) and the first through hole (111) in sequence and then extends out, and the end face of the lead terminal (220) protrudes from the end face of the housing (100).

[0045] It should be noted that the insulating pad (400), as an isolation material between the cap body (210) and the top wall, its main function is to ensure electrical isolation, prevent accidental current flow between metal components, and thus reduce the risk of short circuit. The second through hole (410) provided on the insulating pad (400) is for cooperating with the penetration of the lead terminal (220), ensuring that the lead terminal (220) can pass through and extend out smoothly, while maintaining good insulation from the top wall.

[0046] Please refer to Figure 1 , further, the steel shell battery (10) further includes an electric core (500). The housing (100), the cap (200) and the cover plate (300) enclose a cavity, and the electric core (500) is arranged in the cavity. The electric core (500) includes an electric core body (510), a first tab (520) and a second tab (530). The first tab (520) and the second tab (530) extend out from two end faces of the electric core body (510) respectively. The first tab (520) is welded to the cover plate (300), and the second tab (530) is welded to the cap (200).

[0047] It should be noted that the housing (100), the cap (200) and the cover plate (300) together form a closed cavity, providing a safe encapsulation environment for the electric core (500). The electric core body (510) is accurately placed in the center of the cavity to ensure its stability inside the battery and the reliability of electrical connection. The direct welding connection between the tabs and the cover plate (300) and the cap (200) reduces the intermediate links of electrical connection, reduces the resistance loss, and improves the electrical efficiency of the battery.

[0048] Further, insulating papers (511) are respectively disposed on two end faces of the battery cell body (510), that is, the insulating papers (511) are disposed between the tab and the end faces, further improving electrical isolation and preventing the tabs from being short-circuited.

[0049] Please refer to Figure 1 , further, the second tab (530) includes a starting section (531), an intermediate section (532) and a connecting section (533) connected in sequence. One end of the starting section (531) is connected to the battery cell body (510), the intermediate section (532) is bent relative to the starting section (531) to the end face of the battery cell body (510), and the connecting section (533) is bent relative to the intermediate section and then welded to the cap (200), and the connecting section (533) is disposed between the cap (200) and the intermediate section (532).

[0050] It should be noted that the function of the intermediate section (532) is to extend the path of the tab so that it can extend from the end face of the battery cell body (510) to the top wall area of the housing (100). Since the housing (100) has a certain depth, the setting of the intermediate section (532) becomes a bridge connecting the battery cell (500) and the cap (200), ensuring smooth electrical connection. Since the housing (100) has a certain depth and is narrow, the extension of the tab reduces the welding difficulty and improves the production efficiency. Secondly, the welding point of the connecting section (533) and the cap (200) is designed between the cap (200) and the intermediate section (532). This layout avoids direct pulling on the tab during battery assembly or use, effectively preventing the solder joint from being damaged by external forces and ensuring the long-term stability of the electrical connection. Finally, through the bending design of the intermediate section (532), the intermediate section (532) and the connecting section (533) are stacked, making the layout of the second tab (530) more compact, making full use of the space inside the housing (100), helping to improve the energy density of the battery and meeting the requirements of microelectronic devices for high-energy-density batteries.

[0051] On the other hand, the present invention also provides an electronic device using the above-mentioned steel shell battery (10). By integrating the above-mentioned steel shell battery (10) into various electronic devices, not only can the performance of the device be significantly improved, but also its market competitiveness can be enhanced.

[0052] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A steel shell battery, characterized in that: include: The shell includes a top wall and a side wall, one end of the side wall is connected to the top wall, and the other end of the side wall is an open end. The top wall is provided with a first through hole. The cap is insulated and connected to the top wall and blocks the first through hole. The cover plate is laser welded and sealed to the open end, and an explosion-proof wire is provided on the cover plate.

2. The steel shell battery according to claim 1, characterized in that: The explosion-proof wire is formed by stamping technology.

3. The steel shell battery according to claim 2, characterized in that: The explosion-proof wire is a C-shaped explosion-proof wire arranged around the center of the cover plate.

4. The steel shell battery according to claim 1, characterized in that: The depth of the explosion-proof line is 0.08-0.12 mm.

5. The steel shell battery according to claim 1, characterized in that: It also includes a battery cell, the cap includes a cap body and a lead-out terminal, the cap body is insulated and connected to a side of the top wall close to the battery cell, and the lead-out terminal is led out from the first through hole.

6. The steel shell battery according to claim 5, characterized in that: There is a gap between the lead terminal and the top wall.

7. The steel shell battery according to claim 5, characterized in that: The cap body is insulated and connected to the top wall through an insulating pad, the insulating pad has a second through hole, the lead terminal is led out after passing through the second through hole and the first through hole in sequence, and the end face of the lead terminal protrudes from the end face of the shell.

8. The steel shell battery according to claim 1, characterized in that: The steel shell battery also includes a battery cell. The shell, the cap and the cover plate together form a cavity. The battery cell is arranged in the cavity. The battery cell includes a battery cell body, a first pole ear and a second pole ear. The first pole ear and the second pole ear are respectively led out from two end surfaces of the battery cell. The first pole ear is welded to the cover plate, and the second pole ear is welded to the cap.

9. The steel shell battery according to claim 8, characterized in that: The second pole ear includes a starting section, a middle section and a connecting section which are connected in sequence, one end of the starting section is connected to the battery cell body, the middle section is bent relative to the starting section to the end surface of the battery cell body, the connecting section is bent relative to the middle section and then welded to the cap, and the connecting section is arranged between the cap and the middle section.

10. An electronic device, characterized in that: The invention comprises the steel shell battery according to any one of claims 1 to 9.

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