battery

Abstract

The application relates to the technical field of batteries, and discloses a battery, which comprises a battery shell, a pole column through hole is arranged on the battery shell, a pole column is arranged in the pole column through hole, a hard sealing element, the glass transition temperature of the hard sealing element is 300 DEG C-600 DEG C, at least part of the hard sealing element is arranged in the pole column through hole to seal the pole column and the battery shell, the distance between a first end point and the hole wall of the pole column through hole is a along the extension direction of a first connecting line, the distance between a second end point and the hole wall of the pole column through hole is b along the extension direction of a second connecting line, and 0.9 <= a / b <= 1.1, so that the distance between the first end point and the second end point and the hard sealing element is relatively uniform, the battery shell can provide relatively balanced extrusion force on the hard sealing element, the failure risk of the hard sealing element is avoided, and the safety performance of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery. Background Technology

[0002] In related technologies, rubber components can be used to seal the battery terminals and the battery casing. However, these rubber components are prone to failure after prolonged use. Although other sealing structures are also used, their sealing effect is not very good.

[0003] Glass seals, as a sealing structure, can ensure a good sealing effect; however, due to the limitations of their structural characteristics, they have never been used in the battery field. Summary of the Invention

[0004] This invention provides a battery to improve battery performance.

[0005] This invention provides a battery comprising:

[0006] Battery casing, with through holes for terminals provided on the battery casing;

[0007] The electrode post is inserted into the electrode post through hole;

[0008] A rigid seal with a glass transition temperature of 300°C-600°C is provided at least in the terminal through-hole to seal the terminal and the battery casing.

[0009] The battery casing has a first endpoint and a second endpoint on the circumferential outer edge of the surface with the through hole. The center point of the through hole forms a first line and a second line with the first endpoint and the second endpoint, respectively. The first line and the second line are basically perpendicular. Along the extension direction of the first line, the distance between the first endpoint and the hole wall of the through hole is a, and along the extension direction of the second line, the distance between the second endpoint and the hole wall of the through hole is b, where 0.9≤a / b≤1.1.

[0010] The battery of this invention includes a battery casing, terminals, and a rigid seal. The terminals are disposed within terminals through holes in the battery casing, and at least a portion of the rigid seal is disposed within terminals through holes, thereby achieving effective sealing of the terminals and the battery casing. Due to the high hardness of the rigid seal, problems such as compression deformation failure will not occur, thereby improving the sealing performance of the rigid seal between the terminals and the battery casing. The outer circumferential edge of the surface of the battery casing with the terminal through-hole has a first endpoint and a second endpoint. The center point of the terminal through-hole forms a first line and a second line with the first endpoint and the second endpoint, respectively. The first line and the second line are basically perpendicular. Along the extension direction of the first line, the distance between the first endpoint and the wall of the terminal through-hole is 'a', and along the extension direction of the second line, the distance between the second endpoint and the wall of the terminal through-hole is 'b', where 0.9 ≤ a / b ≤ 1.1. This ensures that the distance between the first endpoint and the second endpoint and the hard seal is relatively uniform, guaranteeing that the battery casing can provide a relatively balanced compressive force to the hard seal, thereby avoiding the risk of failure of the hard seal and improving the safety performance of the battery. Attached Figure Description

[0011] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures.

[0012] in:

[0013] Figure 1 This is a schematic diagram of the structure of a battery according to an exemplary embodiment;

[0014] Figure 2 This is a partial cross-sectional structural diagram of a battery according to an exemplary embodiment;

[0015] Figure 3 This is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0016] Figure 4 This is a partial structural schematic diagram of a battery according to another exemplary embodiment.

[0017] The annotations in the attached figures are explained as follows:

[0018] 10. Battery casing; 11. Terminal through hole; 111. Center point; 12. First end point; 13. Second end point; 14. First casing component; 15. Second casing component; 20. Terminal; 30. Hard seal. Detailed Implementation

[0019] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0020] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0021] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0022] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0023] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 4The battery includes: a battery casing 10, on which a terminal through hole 11 is provided; a terminal 20, which passes through the terminal through hole 11; and a rigid seal 30, the glass transition temperature of which is 300℃-600℃, at least a portion of which is provided in the terminal through hole 11 to seal the terminal 20 and the battery casing 10; wherein, the circumferential outer edge of the surface of the battery casing 10 where the terminal through hole 11 is provided has a first endpoint 12 and a second endpoint 13, the center point 111 of the terminal through hole 11 forms a first line and a second line with the first endpoint 12 and the second endpoint 13 respectively, the first line and the second line are substantially perpendicular, the distance between the first endpoint 12 and the hole wall of the terminal through hole 11 along the extension direction of the first line is a, and the distance between the second endpoint 13 and the hole wall of the terminal through hole 11 along the extension direction of the second line is b, 0.9≤a / b≤1.1.

[0024] A battery according to one embodiment of the present invention includes a battery casing 10, a terminal post 20, and a rigid sealing member 30. The terminal post 20 passes through the terminal post through hole 11 of the battery casing 10, and at least a portion of the rigid sealing member 30 is disposed in the terminal post through hole 11, thereby achieving effective sealing of the terminal post 20 and the battery casing 10. Since the rigid sealing member 30 has high hardness, it will not suffer from problems such as compression deformation failure, thereby improving the sealing performance of the rigid sealing member 30 between the terminal post 20 and the battery casing 10. The outer circumferential edge of the surface of the battery casing 10 with the terminal through hole 11 has a first endpoint 12 and a second endpoint 13. The center point 111 of the terminal through hole 11 forms a first line and a second line with the first endpoint 12 and the second endpoint 13, respectively. The first line and the second line are basically perpendicular. Along the extension direction of the first line, the distance between the first endpoint 12 and the hole wall of the terminal through hole 11 is a, and along the extension direction of the second line, the distance between the second endpoint 13 and the hole wall of the terminal through hole 11 is b, 0.9≤a / b≤1.1. This makes the distance between the first endpoint 12 and the second endpoint 13 and the hard seal 30 relatively uniform, ensuring that the battery casing 10 can provide a relatively balanced compressive force to the hard seal 30, thereby avoiding the risk of failure of the hard seal 30 and improving the safety performance of the battery.

[0025] It should be noted that in related technologies, the terminal post and the battery casing can be sealed with rubber components. However, rubber components can age and deform after prolonged use, leading to sealing failure. In this embodiment, a hard seal 30 is used to seal the terminal post 20 and the battery casing 10. This not only ensures effective sealing of the terminal post 20 and the battery casing 10 during the initial use of the hard seal 30, but also prevents aging of the hard seal 30 after prolonged battery use. Therefore, the sealing failure between the terminal post 20 and the battery casing 10 will not occur due to changes in the structural performance of the hard seal 30 itself.

[0026] The hard seal 30 has high hardness and is not prone to aging. However, its resistance to mechanical impact may be relatively low. Therefore, it is necessary to avoid uneven stress on the hard seal 30. In this embodiment, by making the distance between the first end point 12 and the second end point 13 of the battery casing 10 that applies external force to the hard seal 30 approximately the same, uneven stress on the hard seal 30 can be avoided. This prevents the hard seal 30 from cracking under mechanical impact, thus affecting its sealing performance.

[0027] The glass transition temperature of the hard seal 30 is 300℃-600℃, which means that the hard seal 30 begins to soften at 300℃-600℃. The temperature is relatively high, so the hard seal 30 is not prone to softening, thus avoiding the problem of seal failure during battery use.

[0028] Combination Figure 3 As shown, the outer circumferential edge of the surface of the battery casing 10 where the terminal through hole 11 is provided has a first endpoint 12 and a second endpoint 13. The center point 111 of the terminal through hole 11 forms a first line and a second line with the first endpoint 12 and the second endpoint 13, respectively. The first line and the second line are substantially perpendicular to each other. Figure 3 The figure is shown by two dashed lines. Furthermore, along the extension direction of the first connecting line, the distance between the first endpoint 12 and the wall of the through hole 11 is 'a', and along the extension direction of the second connecting line, the distance between the second endpoint 13 and the wall of the through hole 11 is 'b', where 0.9 ≤ a / b ≤ 1.1. This means that the lengths of the first endpoint 12 and the second endpoint 13 from the hard seal 30 are approximately the same. Therefore, the forces applied to the hard seal 30 by the first endpoint 12 and the second endpoint 13 are approximately the same, thus preventing problems such as cracking of the hard seal 30 under stress.

[0029] The ratio of the distance 'a' between the first endpoint 12 and the wall of the through hole 11 and the distance 'b' between the second endpoint 13 and the wall of the through hole 11 can be 0.9, 0.91, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, or 1.1, etc.

[0030] The rigid seal 30 can be glass, glass ceramic, ceramic, or other glass or ceramic matrix composite materials, without limitation, to ensure that the rigid seal 30 has reliable hardness and avoid aging and other problems.

[0031] In one embodiment, a and b are basically consistent, that is, the ratio of the distance a between the first endpoint 12 and the hole wall of the pole through hole 11 and the distance b between the second endpoint 13 and the hole wall of the pole through hole 11 can be 1, thereby ensuring that the hard seal 30 can receive a relatively uniform force, thus avoiding the problem of the hard seal 30 breaking under force, thereby ensuring the sealing ability of the hard seal 30 and avoiding the problem of sealing failure of the hard seal 30.

[0032] It should be noted that the basic parameters in this application are determined based on consideration of processing errors, installation errors, and measurement errors. If processing errors, installation errors, and measurement errors are ignored, the first and second lines can be perpendicular, while a and b can be aligned.

[0033] In one embodiment, the outer circumferential edge of the surface of the battery housing 10 where the terminal through hole 11 is provided may also have a third endpoint. The center point 111 of the terminal through hole 11 and the third endpoint form a third line. The third line may be on the same straight line as the first line. Along the extension direction of the third connection, the distance between the third endpoint and the hole wall of the terminal through hole 11 is e, 0.9≤a / e≤1.1, and further, a / e=1.

[0034] In one embodiment, the battery may further include a cell disposed within the battery housing 10. The cell may be electrically connected to the battery housing 10, or the cell may be connected to a terminal post 20 on the battery housing 10.

[0035] It should be noted that a battery comprises a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging / discharging. A cell refers to a unit formed by winding or laminating stacked portions, which include a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarities of the first and second electrodes can be interchanged. Both the first and second electrodes are coated with active materials.

[0036] In one embodiment, combined Figure 4 As shown, the battery can be a square battery, that is, a square prism battery. A square prism battery mainly refers to a prism shape, but it is not strictly limited that each side of the prism must be a straight line in the strict sense, and the corners between the sides do not have to be right angles, but can be rounded.

[0037] The battery can be a stacked battery, which is not only convenient to assemble, but also allows for the production of longer batteries. Specifically, the cell is a stacked cell, which has a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator between the first and second electrodes, thereby stacking multiple pairs of first and second electrodes to form a stacked cell.

[0038] Alternatively, the battery can be a wound battery, in which a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes are wound together to obtain a wound battery cell.

[0039] In one embodiment, combined Figures 1 to 3 As shown, the battery can be a cylindrical battery. The battery can also be a wound battery, which involves winding a first electrode, a second electrode with the opposite electrical charge, and a separator disposed between the first and second electrodes to obtain a wound battery cell.

[0040] The surface of the battery casing 10 with the terminal through hole 11 is circular. The hard seal 30 can not only effectively seal the terminal 20 and the battery casing 10, but also the circumferential outer surface of the cylindrical battery can provide a relatively uniform impact force to the hard seal 30, thereby avoiding the hard seal 30 from breaking under external force. That is, the hard seal 30 is subjected to uniform force during the sealing process, achieving a good seal and improving the connection strength between the hard seal 30 and the battery casing 10.

[0041] In one embodiment, the diameter of the cylindrical battery is ≥20mm, which ensures that the cylindrical battery has reliable capacity and guarantees its performance.

[0042] In one embodiment, the distance between the center point 111 and the first endpoint 12 is c, and the thickness of the hard seal 30 within the electrode through hole 11 along the extension direction of the first line is d, where 3% ≤ d / c ≤ 20%. This ensures that the hard seal 30 has reliable structural strength and that the electrode 20 has a reliable flow area, thereby ensuring the safe use performance of the battery.

[0043] When the ratio of the thickness d of the hard seal 30 within the terminal through-hole 11 to the distance c between the center point 111 and the first end point 12 is less than 3%, the overall strength of the hard seal 30 will be insufficient, affecting the sealing and insulation performance between the terminal 20 and the battery casing 10. Conversely, when the ratio of the thickness d of the hard seal 30 within the terminal through-hole 11 to the distance c between the center point 111 and the first end point 12 is greater than 20%, the current-carrying area of ​​the terminal 20 will be insufficient, affecting the battery's electron transport rate. Simultaneously, the outer end of the battery casing 10 will be too close to the hard seal, increasing the risk of impact to the battery casing 10 and causing the hard seal 30 to fail more quickly.

[0044] Combination Figure 3 As shown, the distance between the center point 111 and the first endpoint 12 is c, and the thickness of the hard seal 30 within the pole through hole 11 along the extension direction of the first line is d.

[0045] The ratio between the thickness d of the hard seal 30 within the through hole 11 of the pole post and the distance c between the center point 111 and the first end point 12 can be 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 9%, 9.5%, 10%, 11%, 12%, 13%, 14%, 15%, 15.5%, 16%, 17%, 18%, 19%, 19.5%, 19.8%, 19.9%, or 20%, etc.

[0046] In one embodiment, the hard seal 30 includes glass, ceramic, or glass-ceramic, thus preventing aging of the hard seal 30. Furthermore, by controlling the balance of the force applied by the battery casing 10 to the terminal post 20, damage to the hard seal 30 can be avoided, thereby ensuring the sealing performance of the hard seal 30.

[0047] In one embodiment, the rigid seal 30 is an annular sealing structure, which is used to reliably seal the terminal post 20 and the battery housing 10, avoiding problems such as sealing failure between the terminal post 20 and the battery housing 10.

[0048] The pole through hole 11 can be a polygonal hole, for example, the pole through hole 11 can be a square hole, while the circumferential outer surface of the annular sealing structure formed by the rigid seal 30 can be rectangular, and the part of the pole 20 located in the pole through hole 11 can be a cylindrical structure, or the part of the pole 20 located in the pole through hole 11 can be a rectangular structure, etc., without limitation here.

[0049] In one embodiment, the rigid seal 30 includes an annular sealing structure, which is not only simple in structure but also can achieve a reliable seal between the terminal 20 and the battery housing 10. Furthermore, the annular sealing structure is less prone to stress concentration, thereby preventing the rigid seal 30 from being damaged by mechanical impact, thus ensuring the structural strength of the rigid seal 30 and ensuring a reliable seal between the rigid seal 30 and the battery housing 10 and the terminal 20.

[0050] In one embodiment, such as Figure 1 As shown, the battery housing 10 includes a first housing member 14 and a second housing member 15 connected to each other. The first housing member 14 is a flat plate, and the second housing member 15 forms a receiving cavity. The terminal through hole 11 is provided on the flat plate, which not only has a simple structure, but also makes it easy to install the terminal 20 on the battery housing 10, thereby improving the battery installation efficiency.

[0051] In one embodiment, the first housing member 14 may have a receiving cavity, and the second housing member 15 may have a receiving cavity, and the pole post 20 may be disposed on the first housing member 14 or the second housing member 15. Alternatively, there may be two pole posts 20, which may be disposed on the first housing member 14 and the second housing member 15 respectively.

[0052] It should be noted that the number of terminals 20 can be one. One terminal 20 can be electrically connected to one tab of the battery cell, while the other tab of the battery cell can be electrically connected to the battery casing 10. In this case, the battery casing 10 can be insulated from the terminal 20. The number of terminals 20 can also be two. The two terminals 20 can be located on the same side of the battery casing 10; for example, both terminals 20 can be located on a flat plate. Alternatively, the two terminals 20 can be located on opposite sides of the battery casing 10.

[0053] In one embodiment, the battery housing 10 is made of metal to ensure the structural strength of the battery housing 10 and to facilitate the installation of the hard seal 30, thereby improving the reliable sealing between the hard seal 30 and the terminal post 20 and the battery housing 10.

[0054] The battery casing 10 can be a composite structure of steel, aluminum, copper, or the above-mentioned metal materials, and is not limited here.

[0055] It should be noted that the first housing component 14 and the second housing component 15 can be set independently. In some embodiments, it is not excluded that the first housing component 14 and the second housing component 15 can be a single integral structure, formed by stamping to accommodate the battery cell, and then sealed by welding.

[0056] In one embodiment, the hard seal 30 is thermally fused into the terminal through hole 11, thereby ensuring that the hard seal 30 reliably seals the terminal 20 and the battery casing 10, and improving the manufacturing and installation efficiency of the hard seal 30, thereby improving the battery installation efficiency.

[0057] In one embodiment, the hard seal 30 can be located within the terminal through hole 11, that is, the upper surface of the hard seal 30 can be lower than the outer surface of the battery housing 10, or the upper surface of the hard seal 30 can be flush with the outer surface of the battery housing 10.

[0058] In one embodiment, combined Figure 2 As shown, a portion of the hard seal 30 can be located inside the pole through hole 11, and another portion of the hard seal 30 can be located outside the pole through hole 11, thereby improving the sealing performance of the hard seal 30.

[0059] An embodiment of the present invention also provides a battery pack including the battery described above.

[0060] According to one embodiment of the present invention, the battery pack includes a battery, which includes a battery housing 10, terminals 20, and a rigid seal 30. The terminals 20 are disposed within terminals through holes 11 in the battery housing 10, and at least a portion of the rigid seal 30 is disposed within terminals through holes 11, thereby achieving effective sealing of the terminals 20 and the battery housing 10. Since the rigid seal 30 has high hardness, it will not suffer from problems such as compression deformation failure, thereby improving the sealing performance of the rigid seal 30 between the terminals 20 and the battery housing 10. The outer circumferential edge of the surface of the battery casing 10 with the terminal through hole 11 has a first endpoint 12 and a second endpoint 13. The center point 111 of the terminal through hole 11 forms a first line and a second line with the first endpoint 12 and the second endpoint 13, respectively. The first line and the second line are basically perpendicular. Along the extension direction of the first line, the distance between the first endpoint 12 and the hole wall of the terminal through hole 11 is a, and along the extension direction of the second line, the distance between the second endpoint 13 and the hole wall of the terminal through hole 11 is b, 0.9≤a / b≤1.1. This makes the distance between the first endpoint 12 and the second endpoint 13 and the hard seal 30 relatively uniform, ensuring that the battery casing 10 can provide a relatively balanced compressive force to the hard seal 30, thereby avoiding the risk of failure of the hard seal 30 and improving the safety performance of the battery pack.

[0061] In one embodiment, the battery pack is a battery module or a battery pack.

[0062] The battery module includes multiple batteries, which can be prismatic cells. The battery module may also include end plates and side plates for securing the batteries. Alternatively, the batteries can be cylindrical cells, and the battery module may include a bracket on which the batteries can be fixed.

[0063] The battery pack consists of multiple batteries and a housing, which is used to hold the multiple batteries in place.

[0064] It should be noted that the battery pack includes batteries, and there can be multiple batteries housed within the casing. Alternatively, the multiple batteries can be assembled into a battery module and then installed within the casing. Or, the multiple batteries can be directly housed within the casing, meaning there is no need to group them together; the casing itself can be used to secure the batteries.

[0065] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0066] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, include: Battery housing (10), wherein the battery housing (10) is provided with terminal through holes (11). The pole post (20) is inserted into the pole post through hole (11); A rigid seal (30) has a glass transition temperature of 300℃-600℃. The rigid seal (30) is thermally fused into the electrode through-hole (11). A portion of the rigid seal (30) is located inside the electrode through-hole (11), and another portion of the rigid seal (30) is located outside the electrode through-hole (11) to seal the electrode (20) and the battery casing (10). The lower part of the rigid seal (30) The surface is located inside the through hole (11) of the pole post, so that the part of the through hole (11) of the pole post is not provided with the hard seal (30). The pole post (20) includes a flange portion, and the area enclosed by the circumferential outer edge of the flange portion is larger than the area enclosed by the circumferential outer edge of the through hole (11), so that the flange portion and the outer surface of the battery housing (10) clamp the part of the hard seal (30) located outside the through hole (11); The battery casing (10) has a first endpoint (12) and a second endpoint (13) on the circumferential outer edge of the surface where the electrode through hole (11) is provided. The center point (111) of the electrode through hole (11) forms a first line and a second line with the first endpoint (12) and the second endpoint (13) respectively. The first line and the second line are basically perpendicular. Along the extension direction of the first line, the distance between the first endpoint (12) and the hole wall of the electrode through hole (11) is a. Along the extension direction of the second line, the distance between the second endpoint (13) and the hole wall of the electrode through hole (11) is b. 0.9≤a / b≤1.

1.

2. The battery according to claim 1, characterized in that, a and b are basically the same.

3. The battery according to claim 1, characterized in that, The surface of the battery casing (10) where the electrode through hole (11) is provided is a circular surface.

4. The battery according to claim 3, characterized in that, The distance between the center point (111) and the first endpoint (12) is c, and the thickness of the hard seal (30) within the pole through hole (11) along the extension direction of the first line is d, 3%≤d / c≤20%.

5. The battery according to claim 1, characterized in that, The hard seal (30) includes glass, ceramic or glass-ceramic.

6. The battery according to claim 1, characterized in that, The hard seal (30) is an annular sealing structure.

7. The battery according to claim 6, characterized in that, The hard seal (30) includes an annular sealing structure.

8. The battery according to any one of claims 1 to 7, characterized in that, The battery is a cylindrical battery.

9. The battery according to claim 8, characterized in that, The diameter of the cylindrical battery is ≥20mm.

10. The battery according to any one of claims 1 to 7, characterized in that, The battery casing (10) includes a first casing member (14) and a second casing member (15) connected to each other. The first casing member (14) is a flat plate, and the second casing member (15) has a receiving cavity. The pole through hole (11) is provided on the plate.

11. The battery according to any one of claims 1 to 7, characterized in that, The battery casing (10) is a metal part.

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