Explosion-proof battery

Abstract

The utility model relates to the field of battery preparation, and discloses an explosion-proof battery, the battery comprises a bottom shell, a battery cell, a cover plate assembly and an explosion-proof sheet, one end of the bottom shell is open, the battery cell is accommodated in the bottom shell, and the cover plate assembly is used for blocking the opening; an exhaust through hole is formed in the side wall of the bottom shell, the explosion-proof piece covers the exhaust through hole, and the explosion-proof piece and the side wall of the bottom shell are welded around the exhaust through hole so as to block the exhaust through hole. According to the explosion-proof battery, not only is the safety of the battery improved, but also the stability and the sealing performance of the structure are enhanced, meanwhile, the manufacturing cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery preparation, in particular to a steel shell explosion-proof battery. Background Art

[0002] With the advancement of science and technology and the increasing popularity of electronic products, large-capacity lithium batteries have been widely used in many fields as efficient energy storage solutions. However, lithium batteries may face safety risks such as overvoltage, overheating or abnormal increase in current during the charging and discharging process. If these problems cannot be effectively controlled, they may cause serious consequences such as internal short circuits, thermal runaway and even explosions.

[0003] In order to improve the safety of lithium batteries, the traditional practice is to install an explosion-proof valve on the cover or bottom plate of the battery. The design of the explosion-proof valve can release the internal pressure in time when the internal pressure or temperature of the battery rises abnormally, thereby preventing the battery from exploding. However, in some new steel-shell batteries, due to design limitations or structural characteristics, the battery cover or bottom plate may not be suitable for installing a traditional explosion-proof valve. In this case, how to ensure the safety performance of the battery has become a new technical problem. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a steel shell explosion-proof battery.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] An explosion-proof battery, the battery comprising a bottom shell, a battery cell, a cover plate assembly and an explosion-proof plate, one end of the bottom shell is open, the battery cell is accommodated in the bottom shell, and the cover plate assembly is used to block the opening; an exhaust through hole is opened on the side wall of the bottom shell, the explosion-proof plate cover is arranged on the exhaust through hole, and the explosion-proof plate is welded to the side wall of the bottom shell around the exhaust through hole to block the exhaust through hole.

[0007] In one embodiment, the bottom shell and the explosion-proof disk are made of the same material.

[0008] In one embodiment, the explosion-proof disk is an explosion-proof steel disk.

[0009] In one embodiment, the explosion-proof disk has a thickness of 0.05 mm to 0.1 mm.

[0010] In one embodiment, a groove is formed on the side wall of the bottom shell around the exhaust through hole, and the groove is used to limit the explosion-proof disk.

[0011] In one embodiment, the explosion-proof disk is provided with grooves.

[0012] In one embodiment, the notch is centrally located along the length of the explosion-proof disk.

[0013] In one embodiment, the explosion-proof battery is a cylindrical battery, the exhaust through hole is a strip-shaped through hole opened along the height direction of the battery, and the explosion-proof plate is a strip-shaped explosion-proof plate matching the strip-shaped through hole.

[0014] In one embodiment, the width of the strip-shaped through hole is 2 mm to 5 mm.

[0015] In one embodiment, the cover plate assembly includes a cover plate and a pole piece, the cover plate is insulated and connected to the pole piece, a raised pole column is provided on the pole piece, the cover plate is provided with a through hole, and the pole column is accommodated in the through hole. In one embodiment, the explosion-proof plate is an arc-shaped plate, and its curvature is consistent with the side wall of the bottom shell.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] 1. Traditional explosion-proof valves are usually set on the cover or bottom plate of the battery, while the utility model provides a new safety solution for batteries that cannot be equipped with explosion-proof valves on the cover or bottom plate due to design or structural limitations by opening exhaust holes on the side wall of the battery shell and setting explosion-proof plates. This design is not only flexible, but can adapt to various types of battery structures, especially new steel shell batteries.

[0018] 2. The explosion-proof plate is connected to the side wall of the bottom shell by welding, which not only ensures the stability of the structure, but also enhances the overall sealing and safety of the battery. When the internal pressure of the battery rises abnormally, the explosion-proof plate can break or deform under a predetermined pressure, thereby quickly releasing the internal pressure and effectively preventing the battery from exploding.

[0019] 3. The side wall explosion-proof design provided by the utility model is relatively simple and low-cost, and does not require large-scale transformation of the traditional battery structure, which is conducive to realizing automation and large-scale production on the production line, thereby reducing manufacturing costs;

[0020] 4. Setting the explosion-proof plate on the side wall of the bottom shell instead of the top or bottom of the battery effectively saves space at both ends of the battery. This saved space can be used to increase the volume of the battery cell, thereby increasing the capacity of the battery. 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 an explosion-proof battery according to one embodiment of the utility model;

[0023] Figure 2 This is a schematic structural diagram of an explosion-proof battery bottom shell and an explosion-proof plate according to an embodiment of the utility model;

[0024] Figure 3 It is a schematic structural diagram of an explosion-proof battery cover assembly according to one embodiment of the utility model.

[0025] The numbers in the figure are: 10, explosion-proof battery; 100, bottom shell; 110, exhaust through hole; 120, groove; 200, battery cell; 300, cover plate assembly; 310, cover plate; 311, through hole; 320, pole piece; 321, pole column; 330, insulating pad; 400, explosion-proof plate; 410, groove. DETAILED DESCRIPTION

[0026] 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.

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

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

[0029] See also Figure 1 to Figure 2 , an explosion-proof battery (10), the battery comprising a bottom shell (100), a battery cell (200), a cover plate assembly (300) and an explosion-proof plate (400), one end of the bottom shell (100) is open, the battery cell (200) is accommodated in the bottom shell (100), and the cover plate assembly (300) is used to block the opening; an exhaust through hole (110) is opened on the side wall of the bottom shell (100), the explosion-proof plate (400) is covered on the exhaust through hole (110), and the explosion-proof plate (400) and the side wall of the bottom shell (100) are welded around the exhaust through hole (110) to block the exhaust through hole (110).

[0030] It should be noted that, based on the problem that the existing new structure battery cannot be provided with an explosion-proof structure on both end faces of the battery, the utility model improves the battery, that is, an explosion-proof structure is provided on the side wall of the battery, wherein the exhaust through hole (110) opened on the side wall of the bottom shell (100) is blocked by the explosion-proof plate (400) under normal circumstances. The explosion-proof plate (400) is made of a special metal material and has certain elasticity and strength. When the internal pressure of the battery increases abnormally, the explosion-proof plate (400) will deform or rupture, thereby quickly releasing the internal pressure through the exhaust through hole (110) to prevent the battery from exploding. At the same time, the explosion-proof plate (400) and the side wall of the bottom shell (100) are precisely welded around the exhaust through hole (110), ensuring the tight combination between the explosion-proof plate (400) and the bottom shell (100), and also ensuring that the explosion-proof plate (400) will not fall off or leak under normal working conditions. The welding process may use advanced laser welding or ultrasonic welding technology to provide high-quality welding joints and excellent sealing performance. The utility model discloses an explosion-proof battery (10) which achieves high safety and reliability through a unique design and advanced manufacturing process, ensuring that the internal pressure is quickly released through the explosion-proof plate (400) and the exhaust through hole (110) under abnormal circumstances, thereby preventing potential explosion risks.

[0031] Furthermore, the bottom shell (100) and the explosion-proof disk (400) are made of the same material.

[0032] It should be noted that the use of the same material can ensure that the bottom shell (100) and the explosion-proof disk (400) have consistent performance in terms of thermal expansion coefficient, mechanical strength and corrosion resistance. When the temperature changes, since the bottom shell (100) and the explosion-proof disk (400) are made of the same material, their thermal expansion or contraction rate will remain consistent, thereby reducing the risk of structural stress or sealing failure caused by material mismatch; secondly, the same material also helps to simplify the manufacturing process and improve production efficiency. In the welding process, welding of the same or similar materials is usually easier to achieve because they have similar melting points and welding characteristics, which reduces the difficulty of welding and improves the welding quality and sealing reliability.

[0033] Furthermore, the explosion-proof plate (400) is an explosion-proof steel plate.

[0034] It should be noted that the explosion-proof sheet (400) is specifically made of explosion-proof steel sheets. The steel material has excellent strength and durability, which enables the explosion-proof sheet (400) to withstand huge impact forces when the internal pressure of the battery increases abnormally, ensuring that it effectively breaks or deforms at a critical moment, thereby releasing the excessive pressure inside the battery in time. At the same time, as the basic style of existing lithium-ion batteries, the steel-shell lithium-ion battery has a shell that is well matched with the explosion-proof steel sheet in terms of firmness and stability, which together enhances the overall safety performance of the battery.

[0035] Furthermore, the explosion-proof disk (400) has a thickness of 0.05 mm to 0.1 mm.

[0036] It should be noted that this thickness range ensures that the explosion-proof disc (400) has sufficient mechanical strength. Although the explosion-proof disc (400) is very thin, the high strength characteristics of steel enable it to withstand the abnormally increased pressure inside the battery at critical moments. At the same time, the relatively thin explosion-proof disc (400) is also more likely to break or deform quickly when the predetermined pressure is reached, thereby releasing the excessive pressure inside the battery in time to prevent potential explosion risks.

[0037] See also Figure 1 to Figure 2 Furthermore, a groove (120) is formed on the side wall of the bottom shell (100) around the exhaust hole (110), and the groove (120) is used to limit the explosion-proof plate (400).

[0038] It should be noted that the shape and size of the groove (120) match the explosion-proof disc (400), so that the explosion-proof disc (400) can fit tightly in the groove (120), reducing the risk of the explosion-proof disc (400) falling off or shifting, ensuring the accuracy and stability of the position of the explosion-proof disc (400), and improving the sealing effect of welding; further, the depth of the groove (120) can be consistent with the thickness of the explosion-proof disc (400), so that when the explosion-proof disc (400) is accommodated in the groove (120), the explosion-proof disc (400) will not protrude from the side wall of the bottom shell (100), making the overall structure of the battery more concise.

[0039] See also Figure 1 to Figure 2 Furthermore, the explosion-proof plate (400) is provided with a groove (410).

[0040] It should be noted that when the internal pressure of the battery increases abnormally, the notch (410) can serve as the starting point for pressure release, helping the explosion-proof plate (400) to break or deform more easily at a predetermined position. The notch (410) not only helps to relieve the internal pressure, but also ensures that the pressure can be released in an orderly and safe manner to prevent the battery from exploding. Compared with the explosion-proof plate (400) without the notch (410), the explosion-proof plate (400) with the notch (410) is more sensitive to the change of the internal pressure of the battery. When the battery is abnormal, the explosion-proof plate (400) can react more quickly and release the pressure in time, thereby improving the safety of the battery; further, the notch (410) can be set on the side of the explosion-proof plate (400) close to the battery cell (200), or on the side away from the battery cell (200). In actual applications, the optimal setting position of the notch (410) may be comprehensively determined based on factors such as the specifications of the battery, the use environment and safety standards.

[0041] See also Figure 1 to Figure 2 Furthermore, the notch (410) is centrally arranged along the length direction of the explosion-proof plate (400).

[0042] It should be noted that the centrally arranged notch (410) can maintain the structural symmetry of the explosion-proof plate (400), ensuring that the explosion-proof plate (400) can be evenly stressed when subjected to internal pressure, thereby avoiding stress concentration or irregular fracture caused by structural asymmetry, and helping the explosion-proof plate (400) to break or deform more reliably at a critical moment, thereby safely releasing the excessive pressure inside the battery.

[0043] See also Figure 1 to Figure 2 Furthermore, the explosion-proof battery (10) is a cylindrical battery, the exhaust through hole (110) is a strip-shaped through hole opened along the height direction of the battery, and the explosion-proof plate (400) is a strip-shaped explosion-proof plate (400) that matches the strip-shaped through hole.

[0044] It should be noted that the design of the strip-shaped through hole provides a large exhaust area, ensuring that when the internal pressure of the battery increases abnormally, the pressure can be released quickly and effectively, thereby reducing the risk of battery explosion. The shape and size of the strip-shaped explosion-proof disc (400) completely match the strip-shaped through hole, ensuring that the through hole can be completely covered to prevent any gas or liquid leakage.

[0045] Furthermore, the width of the strip-shaped through hole is 2 mm to 5 mm.

[0046] It should be noted that the width range also takes into account the strength and stability of the battery casing. A through hole that is too wide may weaken the structural strength of the battery casing, while a through hole that is too narrow may limit the gas discharge rate. Therefore, a width of 2mm to 5mm is a balance between ensuring the strength of the casing and the gas discharge efficiency.

[0047] See also Figure 3 The cover plate assembly (300) comprises a cover plate (310) and a pole piece (320), the cover plate (310) and the pole piece (320) are insulated and connected, a protruding pole column (321) is provided on the pole piece (320), a through hole is opened in the cover plate (310), and the pole column (321) is accommodated in the through hole (311).

[0048] It should be noted that the cover plate assembly (300) is covered on the opening of the bottom shell, and the cover plate (310) and the pole piece are insulated and bonded by an insulating pad. During assembly, the battery cell (200) is placed in the bottom shell (100), and the pole ear at one end of the battery cell (200) is welded to the bottom shell (100), and the pole ear at the other end of the battery cell (200) is welded to the side of the pole piece (320) away from the pole column (321), and then liquid is injected. Finally, the side of the cover plate (310) close to the pole piece (320) is laser welded to the bottom shell (100) to complete the sealed assembly of the battery.

[0049] The cover plate assembly (300) of a conventional cylindrical steel shell battery is often relatively thick and heavy, and usually relies on rolling grooves to complete the sealing connection with the bottom shell. The conventional cap design is not only complex in structure but also occupies a large space in batteries of the same height specification, which directly leads to a reduction in the volume and capacity of the battery cell. In the explosion-proof battery of the utility model, firstly, the explosion-proof valve is set on the side wall of the battery to avoid the explosion-proof design occupying the height of the cap assembly. Secondly, the cap assembly has a simple structure and is connected to the bottom shell by laser welding, which minimizes the space occupied by the cap assembly, thereby providing a larger capacity for the battery cell and ultimately improving the battery capacity. Please refer to Figure 1 to Figure 2 Furthermore, the explosion-proof plate (400) is an arc-shaped plate, and its curvature is consistent with the side wall of the bottom shell (100).

[0050] It should be noted that the curvature of the explosion-proof plate (400) is consistent with the side wall of the bottom shell (100), thereby enhancing the fit and structural stability between the explosion-proof plate (400) and the bottom shell (100). At the same time, the design of the arc-shaped explosion-proof plate (400) enables it to disperse the pressure more evenly when subjected to force, thereby reducing the risk of damage to the explosion-proof plate (400) due to stress concentration. Furthermore, the design of the arc-shaped explosion-proof plate (400) can keep the outer surface of the cylindrical battery flat and consistent in appearance.

[0051] 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. An explosion-proof battery, characterized in that: The battery comprises a bottom shell, a battery cell, a cover plate assembly and an explosion-proof plate. One end of the bottom shell is open, the battery cell is accommodated in the bottom shell, and the cover plate assembly is used to block the opening; an exhaust through hole is opened on the side wall of the bottom shell, the explosion-proof plate cover is arranged on the exhaust through hole, and the explosion-proof plate is welded to the side wall of the bottom shell around the exhaust through hole to block the exhaust through hole.

2. The explosion-proof battery according to claim 1, characterized in that: The bottom shell and the explosion-proof disk are made of the same material.

3. The explosion-proof battery according to claim 2, characterized in that: The explosion-proof sheet is an explosion-proof steel sheet.

4. The explosion-proof battery according to claim 3, characterized in that: The thickness of the explosion-proof plate is 0.05mm~0.1mm.

5. The explosion-proof battery according to claim 1, characterized in that: The side wall of the bottom shell is provided with a groove surrounding the exhaust through hole, and the groove is used to limit the explosion-proof plate.

6. The explosion-proof battery according to claim 3, characterized in that: The explosion-proof plate is provided with grooves.

7. The explosion-proof battery according to claim 6, characterized in that: The groove is arranged centrally along the length direction of the explosion-proof plate.

8. The explosion-proof battery according to claim 3, characterized in that: The explosion-proof battery is a cylindrical battery, the exhaust through hole is a strip-shaped through hole opened along the height direction of the battery, and the explosion-proof plate is a strip-shaped explosion-proof plate matching the strip-shaped through hole.

9. The explosion-proof battery according to claim 8, characterized in that: The cover plate assembly comprises a cover plate and a pole piece, wherein the cover plate is insulated and connected to the pole piece, a protruding pole column is arranged on the pole piece, a through hole is opened on the cover plate, and the pole column is accommodated in the through hole.

10. The explosion-proof battery according to claim 3, characterized in that: The explosion-proof plate is an arc-shaped plate, and its curvature is consistent with the side wall of the bottom shell.

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