Battery pack and electric equipment

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack and electric equipment.The battery pack comprises a box body, a connector assembly, an upper cover and a sealing ring, the box body comprises a frame body and a containing space defined by the frame body, and the containing space comprises a battery bin for containing a battery module and a first bin arranged on one side of the battery bin; the connector assembly is arranged in the first bin and comprises a mounting plate, a connecting pipe and a matching pipe, the connecting pipe and the matching pipe are arranged on the two opposite sides of the mounting plate, a sealing groove is formed in the mounting plate, the box body and the connector assembly are covered with the upper cover, and the sealing ring is arranged in the sealing groove. The sealing ring comprises a main body part, a first sealing part arranged on the first side of the main body part and a second sealing part arranged on the second side of the main body part, the first sealing part faces the upper cover, the second sealing part is far away from the upper cover, the first sealing part comprises a first rib and a second rib which are arranged at an interval, and the second sealing part comprises a third rib and a fourth rib which are arranged at an interval. According to the utility model, sealing reliability can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, provide a battery pack and electric equipment specifically. BACKGROUND

[0002] With the development of society, in order to reduce the pollution of automobile exhaust to atmosphere, at present, new energy vehicles such as lithium battery obtain vigorous promotion, as the power source of new energy vehicle, vehicle-mounted battery will be a large amount of heat dissipation when working, usually a set of special water cooling pipeline is used in battery pack to control the temperature of battery, in the battery pack cooling system, the box cover and water quick change need to be sealed, the conventional sealing ring is single sealing, after the assembly of the box cover and water quick change, because of the pressure difference between the inside and outside of the sealing ring, in turn, it will cause the leakage of gas or liquid, and the sealing effect is poor.

[0003] Therefore, there is a need in the art for a new technical solution to solve the above problems. UTILITY MODEL CONTENT

[0004] The utility model aims at solving above-mentioned technical problem, provide a kind of new battery pack and electric equipment that can improve the reliability of sealing.

[0005] The utility model provides a kind of battery pack, comprising:

[0006] Box, including frame and the receiving space formed by the frame around, the receiving space includes the battery compartment of accommodating battery module and the first compartment of being located at the battery compartment side;

[0007] Joint assembly, located in the first compartment, the joint assembly includes mounting plate and the connecting pipe and the cooperation pipe of being located at the opposite sides of mounting plate, sealing groove is equipped on the mounting plate;

[0008] Upper cover, cover is located on the box and the joint assembly;

[0009] Sealing ring, located in the sealing groove, the sealing ring includes main part, the first sealing part of being located at the first side of main part and the second sealing part of being located at the second side of main part;

[0010] Wherein, the first sealing part is towards the upper cover, the second sealing part is away from the upper cover, the first sealing part includes the first rib and the second rib of interval arrangement, and the second sealing part includes the third rib and the fourth rib of interval arrangement.

[0011] In the technical scheme, the first sealing part comprises the first rib and the second rib, the second sealing part comprises the third rib and the fourth rib, and the two ribs of the first sealing part and the second sealing part can divide the pressure difference between the inside and outside of the sealing ring into two parts, that is, the pressure difference on both sides of each rib is half of the pressure difference between the inside and outside of the sealing ring, so that the risk of failure of the sealing ring is reduced, the sealing effect is good, and the sealing reliability is improved.

[0012] In the preferred technical scheme of the battery pack, the first rib and the second rib are provided with a first groove, and the third rib and the fourth rib are provided with a second groove.

[0013] In the technical scheme, the groove is arranged between the two ribs, the pressure in the groove is half of the pressure difference between the inside and outside of the sealing ring, the groove can divide the pressure difference between the inside and outside of the sealing ring into two parts, so that the pressure difference on both sides of each rib is half of the pressure difference between the inside and outside of the sealing ring, the risk of failure of the sealing ring is reduced, the sealing effect is good, and the sealing reliability is improved.

[0014] In the preferred technical scheme of the battery pack, the height of the sealing ring is d, the height of the sealing groove is h, and the compression rate W of the sealing ring is 10%<(d-h) / d<35%.

[0015] In the technical scheme, the compression rate W of the sealing ring is 10%<(d-h) / d<35%, so that the sealing ring can be well compressed to have a good sealing effect, and at the same time, the sealing ring will not be compressed to failure or damaged, so that gas or liquid leakage is avoided, the sealing effect is good, and the sealing reliability is improved.

[0016] In the preferred technical scheme of the battery pack, the cross-sectional area of the sealing ring is S, the height of the sealing groove is h, the width of the sealing groove is a, and the filling rate δ of the sealing ring is 50%<S / (h×a)<85%.

[0017] In the technical scheme, the filling rate δ of the sealing ring is 50%<S / (h×a)<85%, so that the filling effect of the sealing ring in the sealing groove is good, leakage or loss caused by poor filling is avoided, and the sealing effect is good, and the sealing reliability is improved.

[0018] In the preferred technical scheme of the battery pack, the first rib is provided with a first wall facing the second rib, the second rib is provided with a second wall facing the first rib, the first rib and the second rib are provided with a first connecting wall connecting the first wall and the second wall, and the first wall, the second wall and the first connecting wall surround to form the first groove.

[0019] In the technical scheme, the first wall of the first rib, the second wall of the second rib and the first connecting wall form the first groove, the groove is arranged between the two ribs, the groove can grade the pressure difference between the inside and outside of the sealing ring, so that the pressure difference on both sides of each rib is half of the pressure difference between the inside and outside of the sealing ring, the risk of failure of the sealing ring is reduced, and the sealing effect is good. In addition, the first wall and the second wall are connected through the first connecting wall, that is, the first rib and the second rib are an integral whole, which is convenient for processing and manufacturing.

[0020] In the preferred technical scheme of the battery pack, the included angle between the first wall and / or the second wall and the horizontal plane is 30 to 60 degrees.

[0021] In the technical scheme, the included angle between the first wall and / or the second wall and the horizontal plane is 30 to 60 degrees, so that the rib thickness of the sealing ring is relatively thick, the sealing ring has a good compression amount after assembly, has a good compression rebound force, prevents the rib from tilting to both sides, thereby reducing the risk of failure of the sealing ring, and the arranged included angle is convenient for processing and forming.

[0022] In the preferred technical scheme of the battery pack, the third rib is provided with a third wall facing the fourth rib, the fourth rib is provided with a fourth wall facing the third rib, a second connecting wall connecting the third wall and the fourth wall is arranged between the third rib and the fourth rib, and the third wall, the fourth wall and the second connecting wall form the second groove.

[0023] In the technical scheme, the third wall of the third rib, the fourth wall of the fourth rib and the second connecting wall form the second groove, the groove is arranged between the two ribs, the groove can grade the pressure difference between the inside and outside of the sealing ring, so that the pressure difference on both sides of each rib is half of the pressure difference between the inside and outside of the sealing ring, the risk of failure of the sealing ring is reduced, and the sealing effect is good. In addition, the third wall and the fourth wall are connected through the second connecting wall, that is, the third rib and the fourth rib are an integral whole, which is convenient for processing and manufacturing.

[0024] In the preferred technical scheme of the battery pack, the included angle between the third wall and / or the fourth wall and the horizontal plane is 30 to 60 degrees.

[0025] In the technical scheme, the included angle between the third wall and / or the fourth wall and the horizontal plane is 30 to 60 degrees, so that the rib thickness of the sealing ring is relatively thick, the sealing ring has a good compression amount after assembly, has a good compression rebound force, prevents the rib from tilting to both sides, thereby reducing the risk of failure of the sealing ring, and the arranged included angle is convenient for processing and forming.

[0026] In the preferred technical scheme of the battery pack, the sealing groove is arranged outside the connecting pipe and surrounds the connecting pipe, and the sealing ring is annular and arranged in the sealing groove.

[0027] In the case of adopting the above technical scheme, the sealing groove is arranged outside the connecting pipe and surrounds the connecting pipe, the sealing ring is annular and arranged in the sealing groove, and the sealing ring accommodated in the sealing groove can divide the joint assembly into an inner side and an outer side after the upper cover is assembled with the joint assembly, thereby preventing the cooling gas or liquid communicated with the connecting pipe from entering the first compartment or the battery compartment and affecting the use of the battery pack, having a better sealing effect and improving the sealing reliability.

[0028] In a second aspect, the utility model provides a kind of electric equipment, including the battery pack of first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0029] Preferred embodiments of the utility model will be described below with reference to the drawings, in which:

[0030] Figure 1 It is part structure schematic view of the battery pack of the utility model;

[0031] Figure 2 It is part structure explosion drawing of the battery pack of the utility model;

[0032] Figure 3 It is part structure cross-sectional view of the battery pack of the utility model;

[0033] Figure 4 It is cross-sectional view of the joint assembly and sealing ring of the utility model;

[0034] Figure 5 It is cross-sectional schematic view of the sealing ring and sealing groove of the utility model;

[0035] Figure 6 It is structure schematic view of the sealing ring of the utility model;

[0036] Figure 7 It is cross-sectional schematic view of the first embodiment of the sealing ring of the utility model;

[0037] Figure 8 It is cross-sectional schematic view of the second embodiment of the sealing ring of the utility model.

[0038] Reference signs:

[0039] 1, box body;11, frame body;12, first compartment;

[0040] 2, joint assembly;21, mounting plate;211, sealing groove;22, connecting pipe;23, mating pipe;

[0041] 3, upper cover;

[0042] 4, sealing ring; 41, main body part; 42, first sealing part; 421 (421'), first rib; 4211 (4211'), first wall; 422 (422'), second rib; 4221 (4221'), second wall; 423 (423'), first groove; 4231 (4231'), first connecting wall; 43, second sealing part; 431 (431'), third rib; 4311 (4311'), third wall; 432 (432'), fourth rib; 4321 (4321'), fourth wall; 433 (433'), second groove; 4331 (4331'), second connecting wall. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0044] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer" and the like indicate the direction or positional relationship of the terms based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0045] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "connection", "setting", "installation" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be directly connected, or indirectly connected through an intermediate medium. 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.

[0046] As Figures 1 to 8As shown, the battery pack of the utility model in the first aspect comprises a box body 1, a joint assembly 2, an upper cover 3 and a sealing ring 4, the box body 1 comprises a frame body 11 and a containing space formed by the frame body 11, the containing space comprises a battery compartment for accommodating a battery module and a first compartment 12 arranged at one side of the battery compartment, the joint assembly 2 is arranged in the first compartment 12, the joint assembly 2 comprises a mounting plate 21 and connecting pipes 22 and cooperating pipes 23 arranged at opposite sides of the mounting plate 21, the mounting plate 21 is provided with a sealing groove 211, the upper cover 3 is arranged on the box body 1 and the joint assembly 2, the sealing ring 4 is arranged in the sealing groove 211, the sealing ring 4 comprises a main body part 41, a first sealing part 42 arranged at a first side of the main body part 41 and a second sealing part 43 arranged at a second side of the main body part 41, the first sealing part 42 faces the upper cover 3, the second sealing part 43 is away from the upper cover 3, the first sealing part 42 comprises first and second spaced-apart ribs 421 and 422, and the second sealing part 43 comprises third and fourth spaced-apart ribs 431 and 432.

[0047] The first sealing part 42 of the utility model comprises first and second spaced-apart ribs 421 and 422, and the second sealing part 43 comprises third and fourth spaced-apart ribs 431 and 432, so that the internal and external pressure difference of the sealing ring 4 is graded, that is, the pressure difference on both sides of each rib is half of the internal and external pressure difference of the sealing ring 4, the risk of failure of the sealing ring 4 is reduced, better sealing effect is achieved, and the sealing reliability is improved.

[0048] As shown in the drawings, Figures 1 to 4 The sealing groove 211 is arranged on the outside of the connecting pipe 22 and surrounds the connecting pipe 22, the sealing ring 4 is annular, the sealing groove 211 is arranged on the outside of the connecting pipe 22 and surrounds the connecting pipe 22, the sealing ring 4 is annular and arranged in the sealing groove 211, after the upper cover 3 is assembled with the joint assembly 2, the sealing ring 4 arranged in the sealing groove 211 can divide the joint assembly 2 into an inside and an outside, thereby preventing the cooling gas or liquid communicated with the connecting pipe 22 from entering the first compartment 12 or the battery compartment and affecting the use of the battery pack, better sealing effect is achieved, and the sealing reliability is improved.

[0049] As shown in the drawings, Figures 5 to 6As shown, the height of the sealing ring 4 is d, the height of the sealing groove 211 is h, and the compression ratio W of the sealing ring 4 is 10% < (dh) / d < 35%. This allows the sealing ring 4 to be well compressed, providing a good sealing effect, while preventing it from failing or being damaged by compression, ensuring no gas or liquid leakage and thus achieving a good sealing effect and improving the reliability of the seal. In this embodiment, the compression ratio W is preferably 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, or 35%. The height d of the sealing ring 4 is its height in its uncompressed state.

[0050] The cross-sectional area of ​​the sealing ring 4 is S, the height of the sealing groove 211 is h, the width of the sealing groove 211 is a, and the filling rate δ of the sealing ring 4 is 50% < S / (h×a) < 85%. This ensures that the sealing ring 4 fills the sealing groove 211 well, preventing leakage or missing parts due to insufficient filling, and also preventing assembly problems caused by overfilling of the sealing ring 4. This results in a good sealing effect and improves the reliability of the seal. In this embodiment, the preferred filling rate δ is 50%, 52%, 55%, 58%, 60%, 62%, 65%, 68%, 70%, 72%, 75%, 78%, 80%, 82%, or 85%. The cross-sectional area S of the sealing ring 4 is its height in its uncompressed state.

[0051] like Figures 6 to 7 As shown, a first groove 423 is provided between the first rib 421 and the second rib 422, and a second groove 433 is provided between the third rib 431 and the fourth rib 432. The grooves are provided between the two ribs, and the pressure inside the grooves is half of the pressure difference between the inside and outside of the sealing ring 4. The grooves can classify the pressure difference between the inside and outside of the sealing ring 4, so that the pressure difference on both sides of each rib is half of the pressure difference between the inside and outside of the sealing ring 4, which can reduce the risk of sealing ring 4 failure, have a better sealing effect, and thus improve sealing reliability.

[0052] Reference Figure 7For the first embodiment of the utility model, first rib 421 is equipped with first wall 4211 to second rib 422, second rib 422 is equipped with second wall 4221 to first rib 421, first rib 421 and second rib 422 between being equipped with the first connecting wall 4231 of connecting first wall 4211 and second wall 4221, first wall 4211, second wall 4221 and first connecting wall 4231 surround and form first recess 423, first wall 4211 of first rib 421, second wall 4221 of second rib 422 and first connecting wall 4231 surround and form first recess 423, recess is set between two ribs, the pressure difference of the inside and outside of sealing ring 4 can be graded by recess, and then the pressure difference of each rib on both sides is half of the pressure difference of the inside and outside of sealing ring 4, which can reduce the risk of failure of sealing ring 4, and has better sealing effect. In addition, first wall 4211 and second wall 4221 are connected by first connecting wall 4231, that is, first rib 421 and second rib 422 are an integral whole, which is convenient for processing and manufacturing.

[0053] Third rib 431 is equipped with third wall 4311 to fourth rib 432, fourth rib 432 is equipped with fourth wall 4321 to third rib 431, third rib 431 and fourth rib 432 between being equipped with the second connecting wall 4331 of connecting third wall 4311 and fourth wall 4321, third wall 4311, fourth wall 4321 and second connecting wall 4331 surround and form second recess 433, third wall 4311 of third rib 431, fourth wall 4321 of fourth rib 432 and second connecting wall 4331 surround and form second recess 433, recess is set between two ribs, the pressure difference of the inside and outside of sealing ring 4 can be graded by recess, and then the pressure difference of each rib on both sides is half of the pressure difference of the inside and outside of sealing ring 4, which can reduce the risk of failure of sealing ring 4, and has better sealing effect. In addition, third wall 4311 and fourth wall 4321 are connected by second connecting wall 4331, that is, third rib 431 and fourth rib 432 are an integral whole, which is convenient for processing and manufacturing.

[0054] Referring to Figure 8For the second embodiment of the utility model, the first rib 421' is provided with a first wall 4211' facing the second rib 422', the second rib 422' is provided with a second wall 4221' facing the first rib 421', a first connecting wall 4231' connecting the first wall 4211' and the second wall 4221' is arranged between the first rib 421' and the second rib 422', the first wall 4211', the second wall 4221' and the first connecting wall 4231' surround to form a first groove 423', the first wall 4211' of the first rib 421', the second wall 4221' of the second rib 422' and the first connecting wall 4231' surround to form the first groove 423', the grooves are arranged between the two ribs, the grooves can grade the pressure difference inside and outside the sealing ring 4, so that the pressure difference on both sides of each rib is half of the pressure difference inside and outside the sealing ring 4, the risk of failure of the sealing ring 4 can be reduced, and better sealing effect is obtained. In addition, the first wall 4211' and the second wall 4221' are connected through the first connecting wall 4231', that is, the first rib 421' and the second rib 422' are an integral whole, which is convenient for processing and manufacturing.

[0055] The third rib 431' is provided with a third wall 4311' facing the fourth rib 432', the fourth rib 432' is provided with a fourth wall 4321' facing the third rib 431', a second connecting wall 4331' connecting the third wall 4311' and the fourth wall 4321' is arranged between the third rib 431' and the fourth rib 432', the third wall 4311', the fourth wall 4321' and the second connecting wall 4331' surround to form a second groove 433', the third wall 4311' of the third rib 431', the fourth wall 4321' of the fourth rib 432' and the second connecting wall 4331' surround to form the second groove 433', the grooves are arranged between the two ribs, the grooves can grade the pressure difference inside and outside the sealing ring 4, so that the pressure difference on both sides of each rib is half of the pressure difference inside and outside the sealing ring 4, the risk of failure of the sealing ring 4 can be reduced, and better sealing effect is obtained. In addition, the third wall 4311' and the fourth wall 4321' are connected through the second connecting wall 4331', that is, the third rib 431' and the fourth rib 432' are an integral whole, which is convenient for processing and manufacturing.

[0056] Referring to Figure 8In the second embodiment of the utility model, the included angle between the first wall 4211' and / or the second wall 4221' and the horizontal plane is 30-60 degrees, in this embodiment, the included angle between the first wall 4211' and the horizontal plane can be alpha 1, which is 30-60 degrees, the included angle between the second wall 4221' and the horizontal plane can also be alpha 2, which is 30-60 degrees, or the included angle between the first wall 4211' and the horizontal plane can be alpha 1, which is 30-60 degrees, and the included angle between the second wall 4221' and the horizontal plane can be alpha 2, which is 30-60 degrees, the angle of alpha 1 is preferably 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60 degrees, and the angle of alpha 2 is preferably 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60 degrees, so that the rib thickness of the sealing ring 4 is relatively thick, which can make the sealing ring 4 have a better compression amount after assembly, and at the same time has a better compression rebound force, prevents the rib from tilting to both sides, thereby reducing the risk of failure of the sealing ring 4, and the included angle provided is convenient for processing and forming.

[0057] The included angle between the third wall 4311' and / or the fourth wall 4321' and the horizontal plane is 30-60 degrees, in this embodiment, the included angle between the third wall 4311' and the horizontal plane can be alpha 3, which is 30-60 degrees, the included angle between the fourth wall 4321' and the horizontal plane can also be alpha 4, which is 30-60 degrees, or the included angle between the third wall 4311' and the horizontal plane can be alpha 3, which is 30-60 degrees, and the included angle between the fourth wall 4321' and the horizontal plane can be alpha 4, which is 30-60 degrees, the angle of alpha 3 is preferably 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60 degrees, and the angle of alpha 4 is preferably 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60 degrees, so that the rib thickness of the sealing ring 4 is relatively thick, which can make the sealing ring 4 have a better compression amount after assembly, and at the same time has a better compression rebound force, prevents the rib from tilting to both sides, thereby reducing the risk of failure of the sealing ring 4, and the included angle provided is convenient for processing and forming.

[0058] In the second aspect, the utility model discloses an electric device, including the battery pack of the first aspect. The electric device of the technical scheme includes the battery pack of any one of the utility model, so that it has all the technical effects of the battery pack of any one of the utility model.

[0059] It should be noted that the above preferred embodiments are only used to illustrate the principles of the utility model, and are not intended to limit the protection scope of the utility model. Those skilled in the art can adjust the above setting mode without departing from the principles of the utility model, so that the utility model can be applied to more specific application scenarios.

[0060] Of course, the above-mentioned alternative embodiments can also be used in cross with each other, and the alternative embodiments and the preferred embodiments can be combined to form new embodiments to be applied to more specific application scenarios.

[0061] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the utility model, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body comprising a frame and a receiving space formed by the frame, the receiving space comprising a battery compartment for accommodating a battery module and a first compartment provided at one side of the battery compartment; a joint assembly provided in the first compartment, the joint assembly comprising a mounting plate, a connecting pipe and a matching pipe provided at opposite sides of the mounting plate, and a sealing groove provided on the mounting plate; an upper cover provided on the box body and the joint assembly; a sealing ring provided in the sealing groove, the sealing ring comprising a main body portion, a first sealing portion provided at a first side of the main body portion, and a second sealing portion provided at a second side of the main body portion; wherein the first sealing portion faces the upper cover, the second sealing portion is away from the upper cover, the first sealing portion comprises a first rib and a second rib arranged at intervals, and the second sealing portion comprises a third rib and a fourth rib arranged at intervals.

2. The battery pack of claim 1, wherein, A first groove is provided between the first rib and the second rib, and a second groove is provided between the third rib and the fourth rib.

3. The battery pack of claim 1, wherein, The height of the sealing ring is d, the height of the sealing groove is h, and the compression rate W of the sealing ring is 10%<(d-h) / d<35%.

4. The battery pack of claim 1, wherein, The cross-sectional area of the sealing ring is S, the height of the sealing groove is h, the width of the sealing groove is a, and the filling rate δ of the sealing ring is 50%<S / (h×a)<85%.

5. The battery pack of claim 2, wherein, The first rib is provided with a first wall facing the second rib, the second rib is provided with a second wall facing the first rib, a first connecting wall connecting the first wall and the second wall is provided between the first rib and the second rib, and the first wall, the second wall and the first connecting wall form the first groove.

6. The battery pack of claim 5, wherein, The included angle between the first wall and / or the second wall and the horizontal plane is 30-60 degrees.

7. The battery pack of claim 2, wherein, The third rib is provided with a third wall facing the fourth rib, the fourth rib is provided with a fourth wall facing the third rib, a second connecting wall connecting the third wall and the fourth wall is provided between the third rib and the fourth rib, and the third wall, the fourth wall and the second connecting wall form the second groove.

8. The battery pack of claim 7, wherein, The included angle between the third wall and / or the fourth wall and the horizontal plane is 30-60 degrees.

9. The battery pack of claim 1, wherein, The sealing groove is provided on the outer side of the connecting pipe and surrounds the connecting pipe, and the sealing ring is annular.

10. An electric device, characterized by The battery pack comprises the battery pack according to any one of claims 1-9.

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