Shell and battery
By spacing the protective film's shielding area with the weak point of the pressure relief mechanism, the problem of the explosion-proof valve's edge abnormalities being difficult to detect is solved, thus improving the safety and reliability of lithium-ion batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-27
AI Technical Summary
Abnormalities at the edge of the explosion-proof valve are not easily detected, leading to a reduction in the safety of lithium-ion batteries.
In a plane perpendicular to the thickness direction of the protective film, the distance between the shielding area of the protective film and the weak part of the pressure relief mechanism is greater than 0 and less than or equal to 3mm, so as to avoid the shielding area from shielding the weak part and ensure that abnormalities are easily detected.
It improves the safety of lithium-ion batteries, prevents gas and liquid leakage when the pressure relief mechanism is abnormal at the edge, and enhances the reliability and safety of the battery.
Smart Images
Figure CN224053229U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a shell and battery. BACKGROUND
[0002] Lithium ion batteries are widely used in consumer electronics, electric vehicles and renewable energy storage fields due to their high energy density, long cycle life and environmental protection characteristics.
[0003] In the related art, in order to be able to timely discharge the high temperature and high pressure gas inside the lithium ion battery, the lithium ion battery is provided with an explosion-proof valve. The top of the explosion-proof valve is provided with a protective film to prevent dust pollution and electrolyte corrosion.
[0004] However, when the edge of the explosion-proof valve is abnormal, it is not easy to be found, which reduces the safety of the lithium ion battery. SUMMARY
[0005] The utility model discloses a shell and battery to solve the problem that when the edge of the explosion-proof valve is abnormal, it is not easy to be found, which reduces the safety of the lithium ion battery.
[0006] In a first aspect, the utility model discloses a shell, comprising:
[0007] The shell body is provided with a boss;
[0008] The pressure relief mechanism is connected with the shell body, and the pressure relief mechanism comprises a weak part;
[0009] The protective film is arranged on the surface of the pressure relief mechanism, and the protective film comprises a transparent area and a shielding area, the shielding area is connected with the boss, the transparent area is arranged opposite to the pressure relief mechanism at least partially, the weak part is arranged on the inner side of the shielding area, and in the plane perpendicular to the thickness direction of the protective film, the interval between the shielding area and the weak part is L1, L1 is greater than 0 and less than or equal to 3mm.
[0010] In a second aspect, the utility model discloses a battery comprising the shell of the first aspect.
[0011] The utility model discloses a shell and battery, in the plane perpendicular to the thickness direction of the protective film, the interval between the shielding area of the protective film and the weak part of the pressure relief mechanism is greater than 0, which can avoid the shielding area of the protective film shielding the weak part of the pressure relief mechanism, so that the edge of the pressure relief mechanism can be easily found when it is abnormal, and the safety of the battery can be improved. BRIEF DESCRIPTION OF DRAWINGS
[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.
[0013] Figure 1 A structural schematic diagram of a battery provided in the embodiments of the present application is shown in the figure.
[0014] Figure 2 A structural schematic diagram of a battery provided in the embodiments of the present application is shown in the figure. Figure 1
[0015] Figure 3 A structural schematic diagram of a battery provided in the embodiments of the present application is shown in the figure. Figure 1
[0016] Figure 4 A structural schematic diagram of a battery provided in the embodiments of the present application is shown in the figure. Figure 1
[0017] Figure 5 A structural schematic diagram of a battery provided in the embodiments of the present application is shown in the figure. Figure 4
[0018] Figure 6 A structural schematic diagram of a battery provided in the embodiments of the present application is shown in the figure. Figure 5
[0019] Legend of the drawings:
[0020] 10 - shell body; 11 - main shell; 12 - cover plate; 121 - boss; 122 - mounting hole; 123 - liquid injection hole; 20 - pressure relief mechanism; 21 - weak part; 22 - connecting part; 30 - protective film; 31 - transparent area; 32 - shielding area; 40 - adhesive layer; 50 - battery cell; 51 - outer insulating film; 52 - outer insulating plate. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0022] It should be noted that the terms "first", "second" are used only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0023] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0024] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0025] In the above description, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.
[0026] As described in the background, when the edge of the explosion-proof valve is abnormal, it is not easy to be found, which reduces the safety of the lithium ion battery. The inventor found that the reason for this problem is that in the plane perpendicular to the thickness direction of the protective film, the shielding area of the protective film can shield the weak part of the pressure relief mechanism, so that when the edge of the weak part of the pressure relief mechanism is abnormal, the appearance of the production line personnel is not easy to be detected and found, which leads to the subsequent leakage of the edge of the weak part, resulting in the reduction of the safety of the lithium ion battery.
[0027] To solve the above problems, the shell and the battery provided by the embodiments of the present application limit the interval between the shielding area of the protective film and the weak part of the pressure relief mechanism in the plane perpendicular to the thickness direction of the protective film, which can avoid the shielding area of the protective film shielding the weak part of the pressure relief mechanism, so that the edge of the pressure relief mechanism can be easily found when it is abnormal, and the safety of the battery can be improved.
[0028] The shell and the battery provided by the embodiments of the present application will be described in detail below in combination with specific embodiments.
[0029] Referring to Figure 1 and Figure 2 The embodiments of the present application provide a shell applied to a battery.
[0030] In some examples, in order to facilitate the description of the shell, a coordinate system is established for the shell. The first direction of the shell is the X-axis direction, the second direction of the shell is the Y-axis direction, and the third direction of the shell is the Z-axis direction. The X-axis, the Y-axis and the Z-axis are perpendicular to each other.
[0031] Referring to Figure 2 and Figure 3 The shell can include a shell body 10, a pressure relief mechanism 20 and a protective film 30.
[0032] The shell body 10 has a containing cavity for containing the electrolyte and the cell 50 of the battery.
[0033] The shell body 10 can be provided with a boss 121. In some examples, the boss 121 can have a ring structure, and the boss 121 can be arranged on the side of the shell body 10 away from the containing cavity.
[0034] In some examples, the battery includes an outer insulating film 51 and an outer insulating plate 52, which are respectively connected with the shell body 10, and the outer insulating film 51 and the outer insulating plate 52 wrap the shell body 10. In this way, the leakage of electricity can be prevented, and the safety can be improved.
[0035] The pressure relief mechanism 20 can be connected with the shell body 10. The pressure relief mechanism 20 includes a weak part 21. The weak part 21 is used to be broken by the gas inside the battery to achieve pressure relief, avoid fire and cause serious safety accidents, and improve the safety performance of the battery.
[0036] In some examples, the pressure relief mechanism 20 can be a separately produced rupture disc provided with a weak portion 21, and the shell body 10 is provided with a mounting hole 122, and the rupture disc can be welded in the mounting hole 122. Alternatively, the pressure relief mechanism 20 can be formed on the shell body 10 by stamping or the like.
[0037] The protective film 30 is arranged on the surface of the pressure relief mechanism 20. In examples, the protective film 30 can be arranged on the side of the pressure relief mechanism 20 facing away from the accommodation cavity.
[0038] The protective film 30 can prevent dust from contaminating the pressure relief mechanism 20, and prevent the electrolyte from being immersed and contacting the pressure relief mechanism 20, thereby avoiding the electrolyte from contaminating and corroding the pressure relief mechanism 20 and causing the pressure relief mechanism 20 to fail, and achieving the purpose of protecting the pressure relief mechanism 20.
[0039] In some examples, the protective film 30 can be a PET (polyethylene terephthalate) film, a PP (polypropylene) film, or a PE (polyethylene) film, etc.
[0040] The protective film 30 can be a colorless film.
[0041] In some examples, the protective film 30 includes a transparent region 31 and a shielding region 32, and the shielding region 32 is connected to the boss 121.
[0042] The shielding region 32 can be arranged at the edge of the transparent region 31.
[0043] The side of the shielding region 32 facing the boss 121 is provided with an adhesive layer 40 (see Figure 3 ). In this way, the shielding region 32 and the boss 121 are adhesively connected through the adhesive layer 40.
[0044] The adhesive layer 40 can be colored glue. The shielding region 32 is shielded by the adhesive layer 40, so that the pressure relief mechanism cannot be observed through the shielding region 32.
[0045] The transparent region 31 is not in contact with the boss 121. The transparent region 31 is not shielded by the adhesive layer 40, and the pressure relief mechanism 20 can be observed through the transparent region 31.
[0046] The weak portion 21 of the pressure relief mechanism 20 is arranged inside the shielding region 32. In a plane perpendicular to the thickness direction of the protective film 30, the shielding region 32 and the weak portion 21 are spaced apart by a distance L1.
[0047] In some examples, see Figure 4 to Figure 6As shown, the thickness direction of the protective film 30 can be the Z-axis direction. In the plane defined by the X-axis and the Y-axis, the distance between the shielding area 32 and the weak part 21 is L1, L1 is greater than 0 and less than or equal to 3 mm. For example, L1 can be 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc. Of course, L1 can also be other values, which can be selected by those skilled in the art according to requirements, and this embodiment does not make any limitation. If L1 is equal to 0, it will cause that in the plane defined by the X-axis and the Y-axis, the shielding area 32 of the protective film 30 may shield the weak part 21 of the pressure relief mechanism 20 during installation, and it is not easy to be found when the edge of the pressure relief mechanism 20 is abnormal, which will cause the edge of the weak part 21 to leak gas and liquid in the future, and reduce the safety of the battery. By limiting the distance between the shielding area 32 and the weak part 21 to be greater than 0 in the plane defined by the X-axis and the Y-axis, the shielding area 32 of the protective film 30 can avoid shielding the weak part 21 of the pressure relief mechanism 20, so that it is easy to be found when the edge of the pressure relief mechanism 20 is abnormal, and the safety of the battery can be improved.
[0048] If L1 is greater than 3 mm, it will cause that in the plane defined by the X-axis and the Y-axis, the distance between the shielding area 32 and the weak part 21 is too large, which will make the bonding area between the shielding area 32 and the boss 121 too small, causing the protective film 30 to be not firmly bonded with the boss 121, and the protective film 30 is easy to be damaged, and the pressure relief mechanism 20 loses protection. By limiting the distance between the shielding area 32 and the weak part 21 to be less than or equal to 3 mm in the plane defined by the X-axis and the Y-axis, the bonding area between the shielding area 32 and the boss 121 can be avoided to be too small, so that the protective film 30 can be firmly bonded with the boss 121, the protective film 30 is not easy to be damaged, and the protective film 30 can protect the pressure relief mechanism 20.
[0049] In a possible implementation, the shell body 10 can include a main shell 11 and a cover plate 12 connected (see Figure 2 The main shell 11 is provided with an opening at one end in the +Z-axis direction, and the battery cell 50 can be loaded into the main shell 11 from the opening. The cover plate 12 can be arranged at one end of the main shell 11 in the +Z-axis direction, the cover plate 12 is buckled to the opening, and the cover plate 12 can seal the opening to form a containing cavity.
[0050] The pressure relief mechanism 20 can be arranged on the cover plate 12. Alternatively, the pressure relief mechanism 20 is arranged on the side opposite to the cover plate 12 of the main shell 11.
[0051] In some examples, the pressure relief mechanism 20 is a separately produced explosion-proof sheet. The pressure relief mechanism 20 can further include a connecting part 22 (see Figure 3As shown, the connecting portion 22 is arranged at the edge of the weakened portion 21, that is to say, the weakened portion 21 is arranged inside the connecting portion 22. The connecting portion 22 is integrally formed with the weakened portion 21.
[0052] For example, the cover plate 12 is provided with a mounting hole 122 and a boss 121 (see Figure 3 As shown, the mounting hole 122 penetrates the boss 121, and the mounting hole 122 is in communication with the accommodating cavity. The pressure relief mechanism 20 is located in the mounting hole 122, and the pressure relief mechanism 20 blocks the mounting hole 122. The connecting portion 22 of the pressure relief mechanism 20 can be welded with the mounting hole 122.
[0053] The cover plate 12 is also provided with a liquid injection hole 123, through which electrolyte can be injected into the accommodating cavity.
[0054] In the plane defined by the X-axis and the Y-axis, the liquid injection hole 123 is located on one side of the mounting hole 122 and the boss 121. In the +Z-axis direction, the boss 121 is higher than the liquid injection hole 123, which can avoid the electrolyte corroding the pressure relief mechanism 20 during the liquid injection process.
[0055] In a possible implementation, in the plane perpendicular to the thickness direction of the protective film 30, the shielding area 32 of the protective film 30 is flush with the edge of the side of the boss 121 away from the pressure relief mechanism 20, that is to say, in the plane perpendicular to the thickness direction of the protective film 30, the shielding area 32 of the protective film 30 is flush with the edge of the side of the boss 121 in the +Z-axis direction. In this way, the shielding area 32 of the protective film 30 can be prevented from being bonded with the side wall of the boss 121, so that when the weakened portion 21 of the pressure relief mechanism 20 is broken, the resistance of the protective film 30 can be reduced, which is helpful for the breaking of the weakened portion 21.
[0056] In a possible implementation, referring to Figure 4 to Figure 6As shown, the size between the transparent area 31 and the weak portion 21 in the thickness direction of the protective film 30, that is, in the Z-axis direction, is H, H is greater than or equal to 1 mm and less than or equal to 3 mm. For example, H can be 1 mm, 1.1 mm, 1.5 mm, 2 mm, 2.5 mm, 2.9 mm or 3 mm, etc. Of course, H can also be other values, and those skilled in the art can select according to the needs, and this embodiment does not make any limitation. If the value of H is less than 1 mm, the size between the transparent area 31 and the weak portion 21 in the thickness direction of the protective film 30 is too small, and when the pressure relief mechanism 20 is punched open, it is blocked by the protective film 30, which is not conducive to punching open. If the value of H is greater than 3 mm, the size between the transparent area 31 and the weak portion 21 in the thickness direction of the protective film 30 is too large, the bonding area of the shielding area 32 and the boss 121 is too small, which causes the protective film 30 and the boss 121 to be not firmly bonded, and the protective film 30 is easily damaged, the pressure relief mechanism 20 loses protection, and the risk of abnormal opening of the pressure relief mechanism 20 occurs. By limiting the value of H to be greater than or equal to 1 mm and less than or equal to 3 mm, the blocking force of the protective film 30 on the pressure relief mechanism 20 when the pressure relief mechanism 20 is punched open is reduced, which is conducive to punching open, and at the same time, the protective film 30 is not easily damaged, and the protective film 30 can protect the pressure relief mechanism 20.
[0057] In one possible implementation, referring to Figure 4 to Figure 6 As shown, in the plane perpendicular to the thickness direction of the protective film 30, the width of the bonding layer 40 is L2, L2 is greater than or equal to 0.5 mm and less than or equal to 3 mm. For example, L2 can be 0.5 mm, 0.6 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 2.9 mm or 3 mm, etc. Of course, L2 can also be other values, and those skilled in the art can select according to the needs, and this embodiment does not make any limitation. If the value of L2 is less than 0.5 mm, the bonding layer 40 is too narrow, the bonding strength between the shielding area 32 and the boss 121 is insufficient, which causes the protective film 30 and the boss 121 to be not firmly bonded, and the protective film 30 is easily damaged, the pressure relief mechanism 20 loses protection, and the risk of abnormal opening of the pressure relief mechanism 20 occurs. If the value of L2 is greater than 3 mm, the bonding layer 40 is too wide, and the shielding area 32 of the protective film 30 can shield the weak portion 21 of the pressure relief mechanism 20, which is not easy to be found when the edge of the pressure relief mechanism 20 is abnormal, which causes the edge of the weak portion 21 to leak gas and liquid later, which reduces the safety of the battery. By limiting the width of the bonding layer 40 in the plane perpendicular to the thickness direction of the protective film 30 to be greater than or equal to 0.5 mm and less than or equal to 3 mm, the protective film 30 is not easily damaged, the protective film 30 can protect the pressure relief mechanism 20, and at the same time, the edge of the pressure relief mechanism 20 can be easily found when it is abnormal, which can improve the safety of the battery.
[0058] In a possible implementation, referring to Figure 4 to Figure 6 As shown in the drawings, in the thickness direction of the protective film 30, the thickness of the adhesive layer 40 is L3, L3 is greater than or equal to 0.05 mm and less than or equal to 1 mm. For example, L3 can be 0.05 mm, 0.06 mm, 0.1 mm, 0.2 mm, 0.5 mm, 0.7 mm, 0.8 mm or 1 mm, etc. Of course, L3 can also be other values, which can be selected according to the needs of those skilled in the art, and this embodiment does not limit this. If the value of L3 is less than 0.05 mm, the thickness of the adhesive layer 40 will be too small, the bonding strength between the shielding area 32 and the boss 121 will be insufficient, the protective film 30 and the boss 121 will not be bonded firmly, the protective film 30 will be easily damaged, the pressure relief mechanism 20 will lose protection, and the risk of abnormal opening of the pressure relief mechanism 20 will occur. If the value of L3 is greater than 1 mm, the thickness of the adhesive layer 40 will be too large, the bonding strength between the shielding area 32 and the boss 121 will be too large, and the pressure relief mechanism 20 will need higher pressure to break through, which will cause the actual opening pressure to exceed the design value and increase the risk of explosion. By limiting the thickness of the adhesive layer 40 in the thickness direction of the protective film 30 to be greater than or equal to 0.05 mm and less than or equal to 1 mm, the protective film 30 can be prevented from being easily damaged, the protective film 30 can protect the pressure relief mechanism 20, and the risk of explosion can be reduced.
[0059] In a possible implementation, the adhesive layer 40 is annularly arranged on the shielding area 32.
[0060] The shape of the adhesive layer 40 can be a non-closed annular shape or a closed annular shape. In this embodiment, the shape of the adhesive layer 40 is a non-closed annular shape.
[0061] In the circumferential direction of the adhesive layer 40, the ratio of the circumference of the adhesive layer 40 to the circumference of the boss 121 is greater than or equal to 0.8 and less than or equal to 1. For example, the ratio can be 0.8, 0.81, 0.85, 0.85, 0.9, 0.95, or 1, etc. Of course, the ratio can also be other values, and those skilled in the art can choose according to requirements, which are not limited in this embodiment. If the ratio is less than 0.8, the circumference of the adhesive layer 40 will be too small, the bonding strength between the shielding area 32 and the boss 121 will be insufficient, the protective film 30 will not be firmly bonded to the boss 121, the protective film 30 will be easily damaged, the pressure relief mechanism 20 will lose protection, and the risk of abnormal opening of the pressure relief mechanism 20 will occur. If the ratio is greater than 1, the circumference of the adhesive layer 40 will be too large, and the pressure relief mechanism 20 will need higher pressure to break through, resulting in actual opening pressure exceeding the design value and increasing the risk of explosion. By limiting the ratio of the circumference of the adhesive layer 40 to the circumference of the boss 121 in the circumferential direction of the adhesive layer 40 to be greater than or equal to 0.8 and less than or equal to 1, the protective film 30 can be prevented from being easily damaged, the protective film 30 can protect the pressure relief mechanism 20, and the risk of explosion can be reduced.
[0062] In one possible implementation, referring to Figure 4 to Figure 6 As shown, in the thickness direction of the protective film 30, the thickness of the protective film 30 is L4, which is greater than or equal to 0.05 mm and less than or equal to 1 mm. For example, L4 can be 0.05 mm, 0.06 mm, 0.1 mm, 0.2 mm, 0.5 mm, 0.7 mm, 0.8 mm, or 1 mm, etc. Of course, L4 can also be other values, and those skilled in the art can choose according to requirements, which are not limited in this embodiment. If L4 is less than 0.05 mm, the thickness of the protective film 30 will be too small, the tensile strength of the protective film 30 will be too small, the protective film 30 will be easily damaged, the pressure relief mechanism 20 will lose protection, and the risk of abnormal opening of the pressure relief mechanism 20 will occur. If L4 is greater than 1 mm, the tensile strength of the protective film 30 will be too large, and the pressure relief mechanism 20 will need higher pressure to break through, resulting in actual opening pressure exceeding the design value and increasing the risk of explosion. By limiting the thickness of the protective film 30 to be greater than or equal to 0.05 mm and less than or equal to 1 mm in the thickness direction of the protective film 30, the protective film 30 can be prevented from being easily damaged, the protective film 30 can protect the pressure relief mechanism 20, and the risk of explosion can be reduced.
[0063] In one possible implementation, referring to Figure 4 to Figure 6As shown, in the thickness direction of the protective film 30, the thickness of the weak part 21 is L5, L5 is greater than or equal to 0.01mm and less than or equal to 0.2mm. For example, L5 can be 0.01mm, 0.02mm, 0.05mm, 0.1mm, 0.15mm or 0.2mm, etc. Of course, L5 can also be other values, which can be selected according to the needs of those skilled in the art, and this embodiment does not limit this. If the value of L5 is less than 0.01mm, the thickness of the weak part 21 will be too small, and the structural strength of the weak part 21 will be too small, so that the pressure relief mechanism opens prematurely when the designed pressure is not reached, and cannot effectively relieve pressure when the battery really reaches the dangerous pressure, which reduces the overall reliability of the battery. If the value of L5 is greater than 0.2mm, the thickness of the weak part 21 will be too large, and the structural strength of the weak part 21 will be too large, so that the pressure relief mechanism 20 needs higher pressure to break through, which causes the actual opening pressure to exceed the design value, increasing the risk of explosion. By limiting the thickness of the weak part 21 in the thickness direction of the protective film 30 to be greater than or equal to 0.01mm and less than or equal to 0.2mm, the pressure relief mechanism can be opened when the designed pressure is reached, improving the overall reliability of the battery, while reducing the risk of explosion.
[0064] The utility model embodiment provides a kind of battery, including shell.
[0065] Among them, the shell in the embodiment and the structure of the shell provided by any one of the above embodiments are the same, and can bring the same or similar technical effects, which will not be described one by one here, and the specific description can be referred to the description of the above embodiments.
[0066] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the above embodiments, or make equivalent substitution for part or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A housing characterized by, The shell body (10) is provided with a boss (121); A pressure relief mechanism (20) is connected with the shell body (10), and the pressure relief mechanism (20) comprises a weak portion (21); A protective film (30) is arranged on the surface of the pressure relief mechanism (20), the protective film (30) comprises a transparent area (31) and a shielding area (32), the shielding area (32) is connected with the boss (121), the transparent area (31) is arranged at least partially opposite to the pressure relief mechanism (20), the weak portion (21) is arranged on the inner side of the shielding area (32), and in a plane perpendicular to the thickness direction of the protective film (30), the interval between the shielding area (32) and the weak portion (21) is L1, the L1 is greater than 0 and less than or equal to 3 mm. The shell body (10) comprises a main shell (11) and a cover plate (12), one end of the main shell (11) is provided with an opening, and the cover plate (12) is buckled to the opening; 2. The housing of claim 1, wherein The pressure relief mechanism (20) is arranged on the cover plate (12); or the pressure relief mechanism (20) is arranged on the side opposite to the cover plate (12) of the main shell (11). In a plane perpendicular to the thickness direction of the protective film (30), the edge of the side of the shielding area (32) away from the boss (121) is flush with the side of the boss (121) away from the pressure relief mechanism (20).
3. The case according to claim 1, characterized by In the thickness direction of the protective film (30), the size between the transparent area (31) and the weak portion (21) is H, the H is greater than or equal to 1 mm and less than or equal to 3 mm.
4. The case according to claim 1, characterized by The shielding area (32) is provided with an adhesive layer (40) on the side facing the boss (121).
5. The case according to claim 1, characterized by In a plane perpendicular to the thickness direction of the protective film (30), the width of the adhesive layer (40) is L2, the L2 is greater than or equal to 0.5 mm and less than or equal to 3 mm; 6. The housing of claim 5, wherein, In the thickness direction of the protective film (30), the thickness of the adhesive layer (40) is L3, the L3 is greater than or equal to 0.05 mm and less than or equal to 1 mm. The adhesive layer (40) is annularly arranged on the shielding area (32), and in the circumferential direction of the adhesive layer (40), the ratio of the circumference of the adhesive layer (40) to the circumference of the boss (121) is greater than or equal to 0.8 and less than or equal to 1.
7. The case according to claim 5, characterized in that, In the thickness direction of the protective film (30), the thickness of the protective film (30) is L4, the L4 is greater than or equal to 0.05 mm and less than or equal to 1 mm.
8. The housing according to any one of claims 1-6, characterized in that In the thickness direction of the protective film (30), the thickness of the weak portion (21) is L5, the L5 is greater than or equal to 0.01 mm and less than or equal to 0.2 mm.
9. The housing according to any one of claims 1-6, wherein, The shell comprises the shell as claimed in any one of claims 1-9.
10. A battery, characterized by