Single battery, battery pack and electric equipment

Abstract

The invention discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of batteries, the single battery comprises: a shell having an accommodating cavity and a through hole communicated with the accommodating cavity; and the anti-explosion valve is located in the through hole, covers and seals the through hole, and is connected with the shell. The main body part is arranged in a protruding mode in the first direction, namely, the main body part is arranged to be of a structure close to an arch, when external force acts on the main body part, the force acting on the main body part is effectively transmitted to the foundation or the supporting structure through the main body part, namely the force is transmitted to the skirt edge part, and the skirt edge part is connected with the shell. Therefore, part of the acting force is transmitted to the shell. Due to the structural characteristics, the structural strength of the main body part is improved, relatively few materials can be used for bearing relatively large loads, the bearing capacity and stability of the structure are greatly improved, and when the anti-explosion valve is subjected to the action of external force, the main body part has better bearing capacity, so that the risks that the main body part is abnormally cracked and the valve is opened in advance can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a single battery, a battery pack, and an electrical device. Background Art

[0002] The main function of the explosion-proof valve on the battery is to relieve pressure and exhaust gas, which is used for the directional release of high-temperature and high-pressure gas inside the battery when the battery undergoes thermal runaway due to mechanical impact, internal abnormal lap short circuit, etc., thereby improving the safety performance of the battery pack. However, since the explosion-proof valve is in contact with the external environment, its structural strength is relatively low. Under the action of external force, there is a high risk of abnormal cracking and premature valve opening of the explosion-proof valve. Summary of the Invention

[0003] Object of the Invention: The embodiments of this application provide a single battery, aiming to overcome the technical problem that the explosion-proof valve has a high risk of abnormal cracking and premature valve opening under the action of external force; another object of the embodiments of this application is to provide a battery pack; the third object of the embodiments of this application is to provide an electrical device.

[0004] Technical Solution: The single battery described in the embodiments of this application includes:

[0005] A housing having a receiving cavity and a through hole communicating with the receiving cavity;

[0006] An explosion-proof valve located in the through hole and covering the through hole. The explosion-proof valve is connected to the housing. The explosion-proof valve includes a main body portion and a skirt portion surrounding the main body portion. The main body portion is connected to the inner wall of the through hole through the skirt portion. The main body portion protrudes in a first direction, and a notch is provided at the connection between the main body portion and the skirt portion;

[0007] The single battery satisfies: 1.33 ≤ C / t1 ≤ 2.5;

[0008] Wherein, C is the height of the main body portion in the first direction, and t1 is the thickness of the main body portion 21.

[0009] In some embodiments, the main body portion has a top surface facing away from the receiving cavity in the first direction. The top surface includes a first surface and a second surface connected to each other. The first surface surrounds the second surface. The first surface is an arc surface, and the second surface is a flat surface;

[0010] In the first direction, the distance H1 from the second surface to the outer side surface of the housing, and the minimum distance H2 from the first surface to the outer side surface of the housing satisfy: H1 ≤ H2.

[0011] In some embodiments, the main body portion has a first bottom surface facing the accommodation cavity along the first direction, the first bottom surface is disposed opposite to the top surface, and the first bottom surface is an arc surface.

[0012] In some embodiments, the main body portion has a second bottom surface facing the accommodation cavity along the first direction, the second bottom surface is disposed opposite to the top surface, the second bottom surface includes a third surface and a fourth surface connected to each other, the third surface surrounds the fourth surface, the third surface is an arc surface, the fourth surface is a flat surface, the fourth surface is disposed corresponding to the second surface along the first direction, and the area of the fourth surface is the same as the area of the second surface.

[0013] In some embodiments, the main body portion protrudes away from the accommodation cavity along the first direction, or the main body portion protrudes toward the accommodation cavity along the first direction.

[0014] In some embodiments, the explosion-proof valve includes:

[0015] A transition portion, the transition portion surrounds the main body portion, the main body portion is connected to the skirt portion through the transition portion, and the notch is disposed on the transition portion;

[0016] The single cell satisfies: L1≥t1 and L1≥t2;

[0017] Wherein, L1 is the thickness of the transition portion, t1 is the thickness of the main body portion, and t2 is the thickness of the skirt portion.

[0018] In some embodiments, the single cell satisfies: 0.15mm≤t1 = t2≤0.2mm.

[0019] In some embodiments, the explosion-proof valve includes a connecting portion, the connecting portion surrounds the skirt portion, and the skirt portion is connected to the inner wall of the through hole through the connecting portion;

[0020] The single cell satisfies: 0.4mm≤B≤0.6mm;

[0021] Wherein, B is the thickness of the connecting portion in the first direction.

[0022] A battery pack includes the single cell according to any one of the above.

[0023] An electrical device includes the single cell according to any one of the above, or includes the battery pack according to the above.

[0024] Beneficial effects: The single battery of the embodiment of the present application includes: a housing having an accommodation cavity and a through hole communicating with the accommodation cavity; an explosion-proof valve located in the through hole and sealing the through hole, the explosion-proof valve is connected to the housing, the explosion-proof valve includes a main body portion and a skirt portion disposed around the main body portion, the main body portion is connected to the inner wall of the through hole through the skirt portion, the main body portion protrudes in a first direction, and a notch is provided at the connection between the main body portion and the skirt portion; the single battery satisfies: 1.33 ≤ C / t1 ≤ 2.5; where C is the height of the main body portion in the first direction and t1 is the thickness of the main body portion. The main body portion protrudes in the first direction, that is, the main body portion is arranged in a structure close to an arch. When an external force acts on the main body portion, the force acting on it is effectively transmitted to the foundation or support structure through the main body portion, that is, transmitted to the skirt portion, and the skirt portion is connected to the housing, thereby transmitting part of the acting force to the housing. This structural feature improves the structural strength of the main body portion, and relatively less material can be used to bear a large load, greatly improving the bearing capacity and stability of the structure. When the explosion-proof valve is subjected to an external force, the main body portion has better bearing capacity, thereby reducing the risk of abnormal cracking and premature valve opening of the main body portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 Is a perspective view of the housing of the embodiment of the present application;

[0027] Figure 2 Is a sectional perspective view of the housing of the embodiment of the present application;

[0028] Figure 3 Is a side sectional view of the housing of the embodiment of the present application;

[0029] Figure 4 For the embodiment of the present application Figure 3 An enlarged view of area A in;

[0030] Figure 5 Is a perspective view of the explosion-proof valve of the embodiment of the present application;

[0031] Figure 6 Is a front sectional view of the explosion-proof valve of the embodiment of the present application, wherein the first bottom surface is an arc surface;

[0032] Figure 7 Is a front sectional view of the explosion-proof valve of the embodiment of the present application, wherein the first bottom surface includes a third surface and a fourth surface;

[0033] Figure 8 This is a front elevation sectional view of the explosion-proof valve according to an embodiment of the present application, in which the main body portion protrudes in a direction away from the accommodation cavity;

[0034] Figure 9 This is a front elevation sectional view of the explosion-proof valve according to an embodiment of the present application, in which the main body portion protrudes in a direction towards the accommodation cavity;

[0035] Figure 10 This is a front elevation sectional view of the explosion-proof valve according to an embodiment of the present application, in which the explosion-proof valve includes a transition portion;

[0036] Reference numerals: 10 - housing; 11 - accommodation cavity; 12 - through hole; 13 - outer side surface; 20 - explosion-proof valve; 21 - main body portion; 211 - top surface; 2111 - first surface; 2112 - second surface; 212 - first bottom surface; 213 - second bottom surface; 2131 - third surface; 2132 - fourth surface; 22 - skirt portion; 23 - transition portion; 24 - connecting portion; 25 - notch; X - first direction. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, and at least one may be one, two, or two or more, unless otherwise specifically defined.

[0039] The main function of the explosion-proof valve on the battery is pressure relief and exhaust, which is used for the directional release of high-temperature and high-pressure gases inside the battery when the battery undergoes thermal runaway due to reasons such as mechanical impact and internal abnormal lap short circuit, thereby improving the safety performance of the battery pack. At present, the single battery is gradually thinned during design, resulting in a gradual reduction in the size of the explosion-proof valve. How to reasonably arrange the structure of the explosion-proof valve within the limited length and width, so that the valve opening value meets the design requirements, while improving its structural strength, reducing the risk of abnormal cracking and premature valve opening when it is subjected to external forces, is a technical problem that needs to be solved at present.

[0040] In view of this, an embodiment of the present application provides a single cell to overcome at least one of the above technical problems.

[0041] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , in the embodiment of the present application, the single cell includes a housing 10 and an explosion-proof valve 20.

[0042] The housing 10 has a receiving cavity 11 and a through hole 12 communicating with the receiving cavity 11. The explosion-proof valve 20 is located in the through hole 12 and seals the through hole 12. The explosion-proof valve 20 is connected to the housing 10. The explosion-proof valve 20 includes a main body portion 21 and a skirt portion 22 disposed around the main body portion 21. The main body portion 21 is connected to the inner wall of the through hole 12 through the skirt portion 22. The main body portion 21 protrudes along the first direction X. A notch 25 is provided at the connection between the main body portion 21 and the skirt portion 22.

[0043] It can be understood that the explosion-proof valve 20 on the single cell is generally provided on the battery cover plate. However, due to the current thinner battery design, the width of the cover plate connected to one side of the battery housing 10 is getting smaller and smaller. This results in a limited width dimension of the explosion-proof valve 20 originally provided on the cover plate, and the explosion-proof valve 20 cannot be well arranged on the cover plate, which may cause the opening value of the explosion-proof valve 20 not to meet the design requirements of the battery. Therefore, in the present application, the explosion-proof valve 20 originally provided on the battery cover plate is provided on the battery housing 10 (such as Figure 1 ), the width of the upper housing 10 of the battery is generally greater than or equal to the width of the cover plate (at least a part of the cover plate needs to be embedded in the receiving cavity 11 of the housing 10, while reducing the space occupied by the cover plate, so the width of the cover plate is generally less than or equal to the width of the housing 10). The explosion-proof valve 20 can also be provided on other sides of the housing 10. Setting the explosion-proof valve 20 on the housing 10 can provide a larger installation space for the explosion-proof valve 20 by the housing 10, without restricting the width and length dimensions of the explosion-proof valve 20, meeting the design of the structural dimensions of the explosion-proof valve 20 and ensuring its normal valve opening.

[0044] Meanwhile, when the explosion-proof valve 20 is arranged on the housing 10 and its opening value meets the design requirements, the main body portion 21 of the explosion-proof valve 20 can be protruded along the first direction X (along the first direction, the main body portion 21 protrudes from the skirt portion 22), that is, the main body portion 21 is arranged in a structure close to an arch. When an external force acts on the main body portion 21, the force acting on it is effectively transmitted to the foundation or support structure through the main body portion 21, that is, transmitted to the skirt portion 22, and the skirt portion 22 is connected to the housing 10, so as to transmit part of the acting force to the housing 10. This structural feature improves the structural strength of the main body portion 21, and relatively less material can bear a large load, greatly improving the bearing capacity and stability of the structure. When the explosion-proof valve 20 is subjected to an external force, the main body portion 21 has better bearing capacity, thereby reducing the risk of abnormal cracking and premature opening of the main body portion 21.

[0045] The single battery satisfies: 1.33 ≤ C / t1 ≤ 2.5; where C is the height of the main body portion 21 in the first direction X, and t1 is the thickness of the main body portion 21. It can be understood that the ratio of the height C of the main body portion 21 in the first direction X to the thickness t1 of the main body portion 21 is in the range of 1.33 to 2.5 (as Figure 8 shown), and the value of C / t1 can be any value among 1.33, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5 or the range value between any two values. Within this range, when the preset opening value of the explosion-proof valve 20 is satisfied, the compressive capacity of the main body portion 21 can be effectively improved, and to a certain extent, the structural strength of the main body portion 21 can be ensured, avoiding damage or premature opening of the main body portion 21 easily when it is squeezed by an external force. The values of C and t1 can be measured by a caliper or a 3D scanner. It should be noted that when testing the explosion-proof valve 20 in the embodiment of the present application, multiple groups of batteries installed with the explosion-proof valve 20 are taken for testing (the ratio of C and t1 in the main body portion 21 of each explosion-proof valve 20 is different), and a force of 0.4 Mpa can be applied to the large protruding surface of the main body portion 21 (the magnitude of the acting force), and observe whether the main body portion 21 is deformed or cracked. The test results of the embodiment and the comparative example are as follows in the table:

[0046] C / mm t1 / mm C / t1 Result Example 1 0.20 0.15 1.33 No deformation or rupture occurred in the main body Example 2 0.25 0.16 1.56 No deformation or rupture occurred in the main body Example 3 0.28 0.17 1.65 No deformation or rupture occurred in the main body Example 4 0.28 0.18 1.56 No deformation or rupture occurred in the main body Example 5 0.30 0.19 1.58 No deformation or rupture occurred in the main body Example 6 0.30 0.17 1.76 No deformation or rupture occurred in the main body Example 7 0.35 0.18 1.94 No deformation or rupture occurred in the main body Example 8 0.40 0.18 2.22 No deformation or rupture occurred in the main body Example 9 0.45 0.20 2.25 No deformation or rupture occurred in the main body Example 10 0.50 0.20 2.50 No deformation or rupture occurred in the main body Comparative Example 1 0.20 0.17 1.18 Deformation or rupture occurred in the main body Comparative Example 2 0.25 0.2 1.25 Deformation or rupture occurred in the main body Comparative Example 3 0.40 0.15 2.67 Deformation or rupture occurred in the main body Comparative Example 4 0.45 0.15 3.00 Deformation or rupture occurred in the main body Comparative Example 5 0.5 0.15 3.33 Deformation or rupture occurred in the main body

[0047] As can be seen from the above table, when a certain force is applied to the large surface protruding from the main body portion 21, when the value of C / t1 is in the range of 1.33 to 2.5 (including 1.33 and 2.5), no deformation or cracking occurs in the main body portion 21, indicating that the main body portion 21 in this case has good compressive resistance and can reduce the risk of abnormal cracking and premature valve opening of the explosion-proof valve 20. When the value of C / t1 is less than 1.33, deformation or cracking occurs in the main body portion 21. In this case, the height of the main body portion 21 in the first direction X may be small, and the curvature of the arched structure formed by the main body portion 21 is small, which will reduce its compressive resistance, and deformation or cracking may occur when a force is applied. When the value of C / t1 is greater than 2.5, deformation or cracking occurs in the main body portion 21. In this case, the height of the main body portion 21 in the first direction X may be too large, and the curvature of the arched structure formed by the main body portion 21 is too large, which will also reduce its compressive resistance, and deformation or cracking may occur when a force is applied.

[0048] Please refer to Figure 6 , in combination with the above embodiments, in some embodiments, the main body portion 21 has a top surface 211 facing away from the accommodation cavity 11 in the first direction X. The top surface 211 includes a first surface 2111 and a second surface 2112 that are connected to each other. The first surface 2111 surrounds the second surface 2112. The first surface 2111 is an arc surface, and the second surface 2112 is a flat surface. Along the first direction X, the distance H1 from the second surface 2112 to the outer side surface 13 of the housing 10 and the minimum distance H2 from the first surface 2111 to the outer side surface 13 of the housing 10 satisfy: H1 ≤ H2.

[0049] It can be understood that the surface of the main body portion 21 facing away from the accommodation cavity 11 in the first direction X is the top surface 211. The top surface 211 can be formed by a combination of a connected first surface 2111 and a second surface 2112. The second surface 2112 is located in the middle of the first surface 2111, and the second surface 2112 surrounds the first surface 2111. Among them, the second surface 2112 is a flat structure, the first surface 2111 is an arc structure, and the second surface 2112 is at the highest position of the entire top surface 211. That is to say, the outer surface of the side wall of the battery housing 10 where the explosion-proof valve 20 is provided is the outer side surface 13 (such as Figure 6) The distance H1 from the second surface 2112 to the outer side surface 13 of the housing 10 and the minimum distance H2 from the first surface 2111 to the outer side surface 13 of the housing 10 satisfy: H1 ≤ H2. When the main body 21 is acted upon by an external object (the acting force is relatively uniform and perpendicular to the second surface 2112), the external object will first act on the second surface 2112. Since the second surface 2112 is a plane, compared with an arc surface, the plane has a larger contact area with the external object (the contact surface of the external object is also a plane), and a larger plane area can be provided to disperse the local load. This structure can distribute the load more evenly to the entire main body 21 through the top of the plane, avoiding the problem of local stress concentration that may occur at the top of the arc surface.

[0050] Please refer to Figure 6 , in combination with the above embodiments, in some embodiments, the main body 21 has a first bottom surface 212 facing the accommodation cavity 11 along the first direction X. The first bottom surface 212 is arranged opposite to the top surface 211, and the first bottom surface 212 is an arc surface.

[0051] It can be understood that along the first direction X, the first bottom surface 212 arranged opposite to the top surface 211 on the main body 21 is set as an arc surface, and the first bottom surface 212 can face the accommodation cavity 11. When the core in the accommodation cavity 11 undergoes thermal runaway and generates a large amount of gas, the gas with a certain pressure can enter the through hole 12 and squeeze the first bottom surface 212. Since the first bottom surface 212 is an arc surface, it has a larger contact area with the gas generated inside the battery, so that the extrusion force of the gas acting on the first bottom surface 212 per unit time is greater, which can cause the main body 21 to break open in time, and the explosion-proof valve 20 can open the valve in time to relieve pressure, ensuring the safety of the battery and avoiding the explosion of the battery caused by too late valve opening.

[0052] Please refer to Figure 7 , in combination with the above embodiments, in some embodiments, the main body 21 has a second bottom surface 213 facing the accommodation cavity 11 along the first direction X. The second bottom surface 213 is arranged opposite to the top surface 211. The second bottom surface 213 includes a third surface 2131 and a fourth surface 2132 connected to each other. The third surface 2131 surrounds the fourth surface 2132. The third surface 2131 is an arc surface, and the fourth surface 2132 is a plane. The fourth surface 2132 is arranged corresponding to the second surface 2112 along the first direction X, and the area of the fourth surface 2132 is the same as the area of the second surface 2112.

[0053] It can be understood that, along the first direction X, the second bottom surface 213 of the main body portion 21, which is disposed opposite to the top surface 211, includes: a third surface 2131 and a fourth surface 2132. The third surface 2131 surrounds the fourth surface 2132 and they are connected to each other. Among them, the third surface 2131 is an arc surface and the fourth surface 2132 is a flat surface. The fourth surface 2132 is disposed opposite to the second surface 2112 along the first direction X, and they have similar or the same shape and the same area. The purpose is to ensure that the thickness of each part of the main body portion 21 is the same or approximately the same, and to prevent a certain part of the main body portion 21 from being too thin, resulting in the explosion-proof valve 20 rupturing before reaching the preset valve-opening pressure and preventing premature valve opening (if the second bottom surface 213 is set as an arc and the top position of the top surface 211 is a flat surface, then the top position of the arc-shaped second bottom surface 213 is relatively close to the top position of the top surface 211, and the thickness of the main body portion 21 here is relatively thin, which is prone to rupture and causes the explosion-proof valve 20 to open in advance).

[0054] Please refer to Figure 8 and Figure 9 , in combination with the above embodiments, in some embodiments, the main body portion 21 protrudes away from the accommodation cavity 11 along the first direction X, or the main body portion 21 protrudes toward the accommodation cavity 11 along the first direction X.

[0055] It can be understood that the main body portion 21 can be protrudingly disposed toward the accommodation cavity 11 along the first direction X (such as Figure 9 ), the notch 25 can be disposed on the side of the explosion-proof valve 20 facing the accommodation cavity 11, or can be disposed on the side of the explosion-proof valve 20 facing away from the accommodation cavity 11. This setting manner of the main body portion 21 can have a good resistance to the pressure from outside the battery, such as the extrusion of foreign objects, and can reduce the risk of deformation or rupture of the main body portion 21. The main body portion 21 can also be protrudingly disposed away from the accommodation cavity 11 along the first direction X (such as Figure 8 ), the notch 25 can be disposed on the side of the explosion-proof valve 20 facing the accommodation cavity 11, or can be disposed on the side of the explosion-proof valve 20 facing away from the accommodation cavity 11. This setting manner of the main body portion 21 can have a good resistance to the pressure from inside the battery, such as the extrusion force of the gas on the main body portion 21 when thermal runaway occurs inside the battery (when the explosion-proof valve 20 breaks, the gas squeezes the explosion-proof valve 20, and the explosion-proof valve 20 is torn from the position of the notch 25, causing the explosion-proof valve 20 to open. In this application, the protruding setting form of the main body portion 21 enables the main body portion 21 to have good anti-extrusion ability, in order to avoid the main body portion 21 being torn and the gas discharging from the torn position of the main body portion 21), and can reduce the risk of deformation or rupture of the main body portion 21.

[0056] Please refer to Figure 10, in combination with the above embodiments, in some embodiments, the explosion-proof valve 20 includes a transition portion 23. The transition portion 23 is disposed around the main body portion 21, and the main body portion 21 is connected to the skirt portion 22 through the transition portion 23. The notch 25 is disposed on the transition portion 23. The single cell satisfies: L1≥t1 and L1≥t2. Wherein, L1 is the thickness of the transition portion 23, t1 is the thickness of the main body portion 21, and t2 is the thickness of the skirt portion 22.

[0057] It can be understood that a transition portion 23 can be provided between the main body portion 21 and the skirt portion 22. The transition portion 23 is disposed around the main body portion 21, and the notch 25 is disposed on the transition portion 23. At the same time, the thickness L1 of the transition portion 23 is set to be relatively large, and it needs to be greater than or equal to the thickness t1 of the main body portion 21 and the thickness t2 of the skirt portion 22. Since the thickness of the transition portion 23 is relatively large, when the notch 25 is disposed thereon, the range of the depth of the notch 25 that can be set is larger, and the range of the opening value of the explosion-proof valve 20 is larger, so as to be applicable to batteries of different specifications and improve the applicability of the explosion-proof valve 20.

[0058] Please refer to Figure 10 , in combination with the above embodiments, in some embodiments, the single cell satisfies: 0.15 mm≤t1 = t2≤0.2 mm.

[0059] Please refer to Figure 1 , in combination with the above embodiments, in some embodiments, the explosion-proof valve 20 includes a connecting portion 24. The connecting portion 24 is disposed around the skirt portion 22, and the skirt portion 22 is connected to the inner wall of the through hole 12 through the connecting portion 24.

[0060] The single cell satisfies: 0.4 mm≤B≤0.6 mm; wherein, B is the thickness of the connecting portion 24 in the first direction X.

[0061] A battery pack includes the single cell described above. The battery pack is used for storing and releasing electric energy, and includes a box body and a plurality of the above single cells. The plurality of battery cells are accommodated in the box body. Therefore, the battery pack has all the technical features and beneficial effects of the above single cell, and will not be elaborated herein.

[0062] An electrical device includes the single cell described above, or includes the battery pack described above.

[0063] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] The above has introduced in detail the single battery, battery pack and electrical equipment provided by the embodiments of the present application, and specific examples have been used to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell battery, characterized in that: include: A shell having a receiving cavity and a through hole communicating with the receiving cavity; an explosion-proof valve connected to the housing and covering the through hole, the explosion-proof valve comprising a main body and a skirt portion arranged around the main body, the main body being connected to the inner wall of the through hole through the skirt portion, the main body being protruding along a first direction, and a notch being arranged at the connection between the main body and the skirt portion; The single cell battery satisfies: 1.33≤C / t1≤2.5; Wherein, C is the protruding dimension of the main body in the first direction, and t1 is the thickness of the main body.

2. The single cell according to claim 1, characterized in that: The main body has a top surface facing away from the accommodating cavity along the first direction, the top surface includes a first surface and a second surface connected to each other, the first surface is arranged around the second surface, the first surface is an arc surface, and the second surface is a plane; Along the first direction, a distance H1 from the second surface to the outer surface of the shell, and a minimum distance H2 from the first surface to the outer surface of the shell satisfy: H1≤H2.

3. The single cell according to claim 2, characterized in that: The main body has a first bottom surface disposed along the first direction toward the accommodating cavity, the first bottom surface is disposed opposite to the top surface, and the first bottom surface is an arc-shaped surface.

4. The single cell according to claim 2, characterized in that: The main body portion has a second bottom surface arranged along the first direction toward the accommodating cavity, the second bottom surface is arranged opposite to the top surface, the second bottom surface includes a third surface and a fourth surface connected to each other, the third surface is arranged around the fourth surface, the third surface is an arcuate surface, the fourth surface is a plane, the fourth surface and the second surface are arranged correspondingly along the first direction, and the area of ​​the fourth surface is the same as the area of ​​the second surface.

5. The single cell according to claim 1, characterized in that: The main body protrudes away from the accommodating cavity along the first direction, or the main body protrudes toward the accommodating cavity along the first direction.

6. The single cell according to claim 1, characterized in that: The explosion-proof valve comprises: A transition portion, the transition portion is arranged around the main body portion, the main body portion is connected to the skirt portion through the transition portion, and the notch is arranged on the transition portion; The single battery satisfies: L1≥t1, and L1≥t2; Wherein, L1 is the thickness of the transition portion, and t2 is the thickness of the skirt portion.

7. The single cell according to claim 6, characterized in that: The single cell satisfies: 0.15 mm ≤ t1 = t2 ≤ 0.2 mm.

8. The single cell according to claim 1, characterized in that: The explosion-proof valve comprises a connecting portion, the connecting portion is arranged around the skirt portion, and the skirt portion is connected to the inner wall of the through hole through the connecting portion; The single cell meets the following requirements: 0.4mm≤B≤0.6mm; Wherein, B is the thickness of the connecting portion in the first direction.

9. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The method comprises a single cell as claimed in any one of claims 1 to 8, or a battery pack as claimed in claim 9.

Images