Battery device

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device which comprises a battery shell, a sealing nail, an insulating coating and an insulating part, and a liquid injection hole is formed in the first face of the battery shell; the sealing nail is arranged in the liquid injection hole, the sealing nail is provided with a main body area and a welding area, and the welding area is welded with the battery shell; the insulating coating covers the battery shell and the sealing nail; the orthographic projection of the insulating part on the sealing nail at least partially coincides with the welding area. The problem of poor insulation performance caused by poor connection performance of the insulation coating and the welding area due to unevenness of the welding area is solved, and the insulation performance is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular, to a battery device. Background Art

[0002] In an electric vehicle, a battery device is often provided, and the battery device is used to provide power for the electric vehicle. The battery device may include one or more single batteries, and the single batteries are disposed in a box body. In order to improve the safety of the battery device, it is necessary to insulate the single battery from the box body. In the related art, the insulation between the single battery and the box body is achieved by coating an insulating blue film on the surface of the battery. The insulating blue film is easily broken down, resulting in poor safety of the battery.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a battery device, thereby at least to a certain extent improving the safety of the battery device.

[0005] The present disclosure provides a battery device, and the battery device includes:

[0006] A battery housing, on the first surface of which a liquid injection hole is provided;

[0007] A sealing nail, which is disposed in the liquid injection hole, and the sealing nail has a main body area and a welding area, and the welding area is welded to the battery housing;

[0008] An insulating coating, which covers the battery housing and the sealing nail;

[0009] An insulating member, the orthographic projection of which on the sealing nail at least partially coincides with the welding area.

[0010] The battery device provided by the embodiment of the present disclosure includes a battery housing, a sealing nail, an insulating coating and an insulating member. A liquid injection hole is provided on the first surface of the battery housing. The sealing nail is disposed in the liquid injection hole. The sealing nail has a main body area and a welding area, and the welding area is welded to the battery housing. The insulating coating covers the battery housing and the sealing nail. The orthographic projection of the insulating member on the sealing nail at least partially coincides with the welding area. By coating the insulating coating on the battery housing, the insulation between the battery and the box body and between the batteries is realized, avoiding the problem of poor insulation performance of the single battery caused by coating the insulating blue film on the single battery, improving the safety of the battery device, and setting the insulating member in the battery device. The insulating member covers the welding area, solving the problem of poor connection performance between the insulating coating and the welding area caused by the unevenness of the welding area, and further causing poor insulation performance, and improving the insulation performance.

[0011] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0013] Figure 1 Schematic diagram of the structure of a battery device provided for an exemplary embodiment of the present disclosure;

[0014] Figure 2 Partial enlarged view of a battery device provided for an exemplary embodiment of the present disclosure;

[0015] Figure 3 Schematic diagram of the structure of another battery device provided for an exemplary embodiment of the present disclosure;

[0016] Figure 4 Partial enlarged view of another battery device provided for an exemplary embodiment of the present disclosure.

[0017] Description of reference numerals:

[0018] 10. Battery housing; 20. Sealing nail; 21. Main body area; 22. Welding area; 221. Groove; 30. Insulating coating; 40. Insulating member; 50. Liquid injection hole; 51. First hole section; 511. Bottom wall; 512. Side wall; 52. Second hole section. DETAILED DESCRIPTION OF THE EMBODIMENTS

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

[0020] In the description of the present disclosure, unless otherwise clearly defined and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plurality" means two or more; the term "and / or" includes any combination and all combinations of one or more of the associated listed items. In particular, referring to "the / this" object or "one" object also intends to represent one of the possible multiple such objects.

[0021] Unless otherwise specified or stated, terms such as "connection", "fixation", etc. should be understood in a broad sense. 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. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0022] Furthermore, in the description of this disclosure, it should be understood that the orientation terms such as "upper", "lower", "inner", "outer", etc. described in the exemplary embodiments of this disclosure are described from the angles shown in the drawings and should not be construed as a limitation on the exemplary embodiments of this disclosure. It should also be understood that in the context, when an element or feature is mentioned as being connected "on", "under", or "inside", "outside" another element (one or more), it can not only be directly connected "on", "under", or "inside", "outside" another (one or more) element, but also be indirectly connected "on", "under", or "inside", "outside" another (one or more) element through an intermediate element.

[0023] The exemplary embodiments of this disclosure provide a battery device, as Figure 1 and Figure 2 shown, the battery device includes a battery housing 10, a sealing nail 20, an insulating coating 30, and an insulating member 40. A liquid injection hole 50 is provided on the first surface of the battery housing 10; the sealing nail 20 is disposed in the liquid injection hole 50. The sealing nail 20 has a main body area 21 and a welding area 22 (this welding area is the welding mark of the sealing nail 20 and the liquid injection hole 50), and the welding area 22 is welded to the battery housing 10; the insulating coating 30 covers the battery housing 10 and the sealing nail 20; at least part of the orthographic projection of the insulating member 40 on the sealing nail 20 coincides with the welding area 22.

[0024] The battery device provided by the embodiments of this disclosure includes a battery housing 10, a sealing nail 20, an insulating coating 30, and an insulating member 40. A liquid injection hole 50 is provided on the first surface of the battery housing 10. The sealing nail 20 is disposed in the liquid injection hole 50. The sealing nail 20 has a main body area 21 and a welding area 22, and the welding area 22 is welded to the battery housing 10. The insulating coating 30 covers the battery housing 10 and the sealing nail 20. At least part of the orthographic projection of the insulating member 40 on the sealing nail 20 coincides with the welding area 22. By coating the insulating coating 30 on the battery housing 10, insulation between the battery and the box body and between the batteries is achieved, avoiding the problem of poor insulation performance of the single battery caused by covering the single battery with an insulating blue film, improving the safety of the battery device, and by providing the insulating member 40 in the battery device, with the insulating member 40 covering the welding area 22, the problem of poor connection performance between the insulating coating 30 and the welding area 22 caused by the unevenness of the welding area 22, and thus the problem of poor insulation performance is solved, improving the insulation performance.

[0025] The battery device provided by the embodiments of the present disclosure will be described in detail below:

[0026] In one embodiment, the battery device may be a single cell. On this basis, the insulating member 40 is connected to the battery housing 10. Exemplarily, the single cell may include a battery housing 10, an electrode assembly, and a terminal. The battery housing 10 has an accommodation space therein, the electrode assembly is disposed in the accommodation space, and the terminal is disposed on the battery housing 10 and is connected to the electrode assembly.

[0027] During the use of the battery, an electrolyte is present in the battery housing 10. A liquid injection hole 50 is provided on the battery housing 10, and the liquid injection hole 50 is used to inject the electrolyte during the manufacturing process of the battery. The liquid injection hole 50 is provided on the first surface of the battery housing 10. The terminal may be provided on the first surface of the battery housing 10, or the terminal may be provided on a surface other than the first surface of the battery housing 10.

[0028] A sealing nail 20 is provided in the liquid injection hole 50, and the sealing nail 20 is used to block the liquid injection hole 50. The sealing nail 20 may include a main body region 21 and a welding region 22. The welding region 22 surrounds the main body region 21, and the welding region 22 is used to weld to the battery housing 10. For example, the welding region 22 and the battery housing 10 are welded by laser welding, resistance welding, or butt welding. After the welding region 22 and the battery housing 10 are welded, the surface flatness of the welding region 22 is poor. When an insulating coating 30 is applied to the welding region 22, due to the uneven surface of the welding region 22, the adhesion between the insulating coating 30 and the welding region 22 is poor, which may cause the insulating coating 30 to be easily peeled off or damaged, thereby affecting the insulation performance of the battery.

[0029] In the embodiments of the present disclosure, the single cell may be a cylindrical battery or a prismatic battery (for example, a quadrangular prism battery or a hexagonal prism battery, etc.). When the single cell is a cylindrical battery, the first surface of the battery housing 10 is an end surface of the battery housing 10. When the single cell is a prismatic battery, the first surface of the battery housing 10 is any surface of the battery housing 10.

[0030] Exemplarily, the battery housing 10 may include a housing main body, a first cover plate, and a second cover plate. The housing main body has a cylindrical structure with openings at both ends, and the first cover plate and the second cover plate respectively seal the two ends of the housing main body. The first cover plate and the second cover plate are respectively and hermetically connected to the housing main body. The first cover plate and the second cover plate may be a split molding structure with respect to the housing main body. Or one of the first cover plate and the second cover plate is integrally formed with the housing main body, and the other is a split molding structure with respect to the housing main body.

[0031] The liquid injection hole 50 can be provided on the first cover plate or the second cover plate. For example, the first cover plate and the housing body are of a split molding structure, and the second cover plate and the housing body are of an integral molding structure. The pole column is provided on the first cover plate, and the liquid injection hole 50 is provided on the second cover plate, or, both the pole column and the liquid injection hole 50 are provided on the first cover plate, or, both the pole column and the liquid injection hole 50 are provided on the second cover plate.

[0032] One or more pole columns can be provided on the first surface of the battery housing 10. For example, one pole column is provided on the first surface of the battery housing 10, and this pole column serves as one electrode end of the single cell, and the battery housing 10 serves as the other electrode end of the single cell. Or, a first pole column and a second pole column are provided on the first surface of the battery housing 10, and one of the first pole column and the second pole column is a positive pole column, and the other of the first pole column and the second pole column is a negative pole column.

[0033] The battery cell is disposed within the battery housing 10, the battery cell is connected to the pole column, and the battery cell is immersed in the electrolyte. The battery cell includes a battery cell body and tab ears, and the tab ears extend from the battery cell body; there are two tab ears on the battery cell body, and the two tab ears are respectively a first tab ear (positive tab ear) and a second tab ear (negative tab ear), and the first tab ear and the second tab ear can be respectively connected to corresponding adapter parts.

[0034] It should be noted that the battery cell body can include more than two electrode plates, the tab ears include more than two single-piece tab ears, the single-piece tab ears respectively extend from the electrode plates corresponding to them, the width of the single-piece tab ear is less than the width of the electrode plate, and multiple single-piece tab ears are stacked to form the tab ears.

[0035] In one embodiment, the battery is a stacked battery, which is not only convenient for grouping, but also a battery with a longer length can be obtained by processing. The battery cell is a stacked battery cell, and the battery cell has a first electrode plate, a second electrode plate having an opposite electric property to the first electrode plate, and a separator disposed between the first electrode plate and the second electrode plate that are stacked with each other, so that multiple pairs of the first electrode plate and the second electrode plate are stacked to form the stacked battery cell.

[0036] Optionally, the battery cell can be a wound battery cell, that is, the first electrode plate, the second electrode plate having an opposite electric property to the first electrode plate, and the separator disposed between the first electrode plate and the second electrode plate are wound to obtain the wound battery cell.

[0037] When the two electrode ends of the single cell are respectively the first pole column and the second pole column, the first tab ear is connected to the first pole column through the first adapter part, and the second tab ear is connected to the second pole column through the second adapter part. When the two electrode ends of the single cell are respectively the pole column and the battery housing 10, the first tab ear is connected to the pole column through the first adapter part, and the second pole column is connected to the battery housing 10 through the second adapter part.

[0038] An injection hole 50 is provided on the first surface of the battery shell 10, and the injection hole 50 passes through the shell wall where the first surface is located. During the battery production process, the electrolyte is injected into the battery shell 10 from the injection hole 50. In the embodiment of the present disclosure, the injection hole 50 includes a first hole segment 51 and a second hole segment 52, and the cross-sectional area of ​​the first hole segment 51 is greater than the cross-sectional area of ​​the second hole segment 52. The first hole segment 51 is located on the outside of the second hole segment 52, that is, the injection hole 50 has a stepped structure. The sealing nail 20 is provided in the first hole segment 51, and the sealing nail 20 and the injection hole 50 are connected by welding. For example, the sealing nail 20 and the injection hole 50 can be connected by penetration welding or butt welding.

[0039] For example, the injection hole 50 can be a circular stepped hole. The first hole segment 51 and the second hole segment 52 are both circular holes, the first hole segment 51 and the second hole segment 52 are coaxially arranged, and the diameter of the first hole segment 51 is greater than the diameter of the second hole segment 52. The bottom wall of the first hole segment 51 forms a support platform, and the sealing nail 20 is installed on the support platform. Of course, in practical applications, the injection hole 50 can also be a stepped hole of other shapes, for example, the injection hole 50 can be a square stepped hole or an elliptical stepped hole, etc., and the embodiments of the present disclosure are not limited to this.

[0040] When the sealing pin 20 and the injection hole 50 are welded by penetration welding, the sealing pin 20 and the bottom wall 511 of the first hole section 51 are welded, and the orthographic projection of the insulating member 40 on the first surface of the battery housing 10 at least covers the bottom wall 511 of the first hole section 51 .

[0041] For example, the welding area 22 surrounds the main body area 21 , and the welding area 22 is provided with a bending portion, the bending portion forms a groove 221 close to the second hole section 52 , and the insulating member 40 at least covers the groove 221 .

[0042] When the sealing pin 20 and the injection hole 50 are welded by butt welding, the sealing pin 20 is arranged in the first hole section 51, and the sealing pin 20 and the side wall 512 of the first hole section 51 are welded, and the orthographic projection of the insulating part 40 on the first surface of the battery shell 10 at least covers the side wall 512 of the first hole section 51.

[0043] The main body area 21 is a flat plate or a structure that is approximately flat. The welding area 22 may include a first enclosure, a second enclosure, and a connecting plate. The first enclosure is arranged around the main body area 21, and the first enclosure and the main body area 21 are arranged vertically. One end of the first enclosure is connected to the main body area 21, and the other end of the first enclosure extends toward the direction close to the battery cell. The connecting plate is connected to the end of the first enclosure away from the main body area 21, the connecting plate surrounds the first enclosure, and the connecting plate extends outward. The second enclosure is connected to the outer edge of the connecting plate, the second enclosure is arranged parallel to the first enclosure, and there is a gap between the second enclosure and the first enclosure, and the gap forms a groove 221 of the welding area 22.

[0044] The connecting plate abuts against the bottom wall of the first hole section 51, and the connecting plate and the bottom wall of the first hole section 51 are welded. A welding mark is formed on the bottom wall of the connecting plate facing away from the first hole section 51, and the welding mark generally has an uneven morphology. When the insulating coating 30 is applied to the welding mark, the insulating coating 30 is prone to peeling off or being damaged.

[0045] The insulating member 40 and the first surface of the battery housing 10 are arranged opposite to each other, and the orthographic projection of the insulating member 40 on the sealing nail 20 at least partially coincides with the welding area 22. By arranging the insulating member 40 in the welding area 22, the insulating failure (peeling off or being damaged) of the insulating coating 30 can be avoided, and the safety of the battery device is improved.

[0046] In a feasible embodiment, as Figure 1 and Figure 2 shown, the insulating member 40 is filled in the groove 221 of the welding area 22. By filling the insulating member 40 in the welding area 22, the welding area 22 is flattened, thereby solving the problem that the insulating coating 30 is prone to peeling off or being damaged due to the uneven surface of the welding area 22. For example, the insulating member 40 is an insulating glue layer, and the insulating glue layer is arranged between the insulating coating 30 and the welding area 22.

[0047] When the main body area 21 is flush with the first surface of the battery housing 10, the lowest side of the welding area 22 is lower than the first surface of the battery housing 10, the insulating glue layer is filled in the welding area 22, and the surface of the insulating glue layer facing away from the welding area 22 is flush with the first surface of the battery housing 10. That is, by means of the insulating member 40, a flat outer surface is formed on the first surface of the battery housing 10, and the insulating coating 30 is applied to the flat first surface, which is beneficial to improving the quality of the insulating coating 30 on the first surface of the battery housing 10, and further improving the safety of the battery device.

[0048] When the welding area protrudes from the first surface of the battery housing 10, the insulating glue layer is filled in the area outside it. That is, by filling the insulating member 40 in the recess formed by the sealing nail 20 on the first surface of the battery housing 10, the first surface of the battery housing 10 is made flat, and the insulating coating 30 is applied to the flat first surface, which is beneficial to improving the quality of the insulating coating 30 on the first surface of the battery housing 10, and further improving the safety of the battery device.

[0049] In another feasible embodiment, as Figure 3 and Figure 4 shown, the insulating member 40 is an insulating film, and the insulating film is arranged on the side of the insulating coating 30 facing away from the sealing nail 20. For example, the insulating film can be an insulating tape. By arranging the insulating member 40 on the side of the insulating coating 30 facing away from the sealing nail 20, the insulating coating 30 in the welding area 22 can be protected, and the insulating failure caused by the peeling off or being damaged of the insulating coating 30 in the welding area 22 can be avoided.

[0050] The insulating coating 30 covers the battery case 10 and the sealing nail 20. The insulating coating 30 can be a UV insulating coating 30. The UV coating material can seamlessly connect with the battery case 10, providing more comprehensive protection for the battery and effectively preventing the risks of short circuit and thermal runaway.

[0051] Exemplarily, the insulating coating 30 includes a first coating part and a second coating part. The first coating part is located in the welding area 22; the second coating part is located in the area outside the liquid injection hole 50 on the battery case 10. Wherein, the ratio of the thickness of the first coating part to the thickness of the second coating part is 1.1:1 - 2:1 (the ratio range of the thickness of the first coating part to the thickness of the second coating part is 1.1 - 2). For example, the ratio of the thickness of the first coating part to the thickness of the second coating part can be 1.1, 1.2, 1.8, or 2, etc.

[0052] By setting the ratio of the thickness of the first coating part to the thickness of the second coating part to 1.1 - 2, on the one hand, the insulation performance of the single battery can be ensured, and on the other hand, the problem of complex coating process caused by too large a difference in the thickness between the first coating part and the second coating part can be avoided.

[0053] In another embodiment, the battery device can be a battery module or a battery pack. When the battery device is a battery pack, the battery pack includes at least one single battery and a box body. The single battery includes a battery case 10, a sealing nail 20, and an insulating coating 30. An insulating member 40 is provided in the box body. When the single battery is installed in the box body, the first surface of the battery case 10 faces the insulating member 40. That is, the insulating coating 30 in the welding area 22 is protected by the insulating member 40 provided on the box body.

[0054] The box body can include a bottom plate and a frame. The frame is connected to the bottom plate, and the frame and the bottom plate enclose a battery compartment for accommodating the battery. The single battery is arranged in the battery compartment. Multiple single batteries can be arranged in the battery compartment according to a preset rule.

[0055] Exemplarily, the liquid injection hole 50 is provided at the bottom of the battery case 10, and the sealing nail 20 plugs the liquid injection hole 50. That is, the sealing nail 20 is arranged towards the bottom of the box body. A sealing member is provided on the bottom plate. When the battery is installed in the battery compartment, the sealing nail 20 abuts against the sealing member on the bottom plate, protecting the insulating coating 30 in the welding area 22 through the sealing member, solving the problem that the sealing coating in the welding area 22 is prone to falling off or being damaged, and improving the safety of the battery device.

[0056] It can be understood that in the embodiments of the present disclosure, the liquid injection hole 50 and the sealing nail 20 may also be provided on the top of the battery housing 10. That is to say, the liquid injection hole 50 and the sealing nail 20 are provided on the side of the battery housing 10 facing away from the bottom plate. On this basis, the insulating member 40 may be an insulating material provided on the box cover, or the insulating member 40 may be an insulating portion on the wiring harness board, etc.

[0057] The battery device provided by the embodiments of the present disclosure includes a battery housing 10, a sealing nail 20, an insulating coating 30, and an insulating member 40. A liquid injection hole 50 is provided on the first surface of the battery housing 10. The sealing nail 20 is disposed in the liquid injection hole 50. The sealing nail 20 has a main body region 21 and a welding region 22. The welding region 22 is welded to the battery housing 10. The insulating coating 30 covers the battery housing 10 and the sealing nail 20. At least a part of the orthographic projection of the insulating member 40 on the sealing nail 20 coincides with the welding region 22. By coating the insulating coating 30 on the battery housing 10, insulation between the battery and the box body and between the batteries is achieved, avoiding the problem of poor insulation performance of the single battery caused by covering the single battery with an insulating blue film, improving the safety of the battery device, and by providing the insulating member 40 in the battery device, with the insulating member 40 covering the welding region 22, the problem of poor connection performance between the insulating coating 30 and the welding region 22 caused by the unevenness of the welding region 22, and thus the problem of poor insulation performance is solved, improving the insulation performance.

[0058] The battery device provided by the embodiments of the present disclosure can be applied to electric vehicles. When the battery device is used in an electric vehicle, the battery device is integrated into a battery pack, and the battery pack is installed on the electric vehicle to provide energy for the electric vehicle. In actual applications, the battery pack can be installed on the frame of the electric vehicle. The battery pack can be fixedly connected to the frame. Or the battery pack can be a modular battery pack, and the modular battery pack can be detachably connected to the vehicle body for easy replacement.

[0059] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only to be regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A battery device, characterized in that: The battery device comprises: A battery housing, wherein a liquid injection hole is provided on a first surface of the battery housing; A sealing nail, the sealing nail is arranged at the injection hole, the sealing nail has a main body area and a welding area, and the welding area is welded to the battery shell; an insulating coating covering the battery housing and the sealing nail; An insulating member, wherein an orthographic projection of the insulating member on the sealing pin at least partially overlaps with the welding area.

2. The battery device according to claim 1, characterized in that The sealing pin and the injection hole are welded by penetration welding, the injection hole includes a first hole segment and a second hole segment, the cross-sectional area of ​​the first hole segment is larger than the cross-sectional area of ​​the second hole segment, the first hole segment is located outside the second hole segment, the sealing pin is arranged in the first hole segment, and the orthographic projection of the insulating member on the first surface of the battery shell at least covers the bottom wall of the first hole segment.

3. The battery device according to claim 2, characterized in that: The welding area surrounds the main body area, and the welding area is provided with a bending portion, the bending portion forms a groove, and the insulating member at least covers the groove.

4. The battery device according to claim 1, characterized in that: The sealing pin and the injection hole are welded by butt welding, the injection hole includes a first hole segment and a second hole segment, the cross-sectional area of ​​the first hole segment is larger than the cross-sectional area of ​​the second hole segment, the first hole segment is located outside the second hole segment, the sealing pin is arranged in the first hole segment, and the sealing pin and the side wall of the first hole segment are welded, and the orthographic projection of the insulating member on the first surface of the battery shell at least covers the side wall of the first hole segment.

5. The battery device according to claim 1, wherein: The insulating coating comprises: a first coating portion, the first coating portion being located in the welding area; A second coating portion, the second coating portion is located in an area outside the injection hole on the battery housing; Wherein, the ratio of the thickness of the first coating portion to the thickness of the second coating portion is 1.1:1-2:

1.

6. The battery device according to claim 1, wherein: The insulating member is an insulating adhesive layer, and the insulating adhesive layer is arranged between the insulating coating and the welding area.

7. The battery device according to claim 6, characterized in that: The main body area is flush with the first surface of the battery shell, the lowest side of the welding area is lower than the first surface of the battery shell, the insulating glue layer is filled in the welding area, and the surface of the insulating glue layer away from the welding area is flush with the first surface of the battery shell.

8. The battery device according to claim 1, wherein: The insulating member is an insulating film, and the insulating film is arranged on a side of the insulating coating layer away from the sealing pin.

9. The battery device according to claim 1, characterized in that: The battery device is a single battery, and the insulating member is connected to the battery housing.

10. The battery device according to claim 1, wherein: The battery device is a battery pack, which includes at least one single cell and a box body. The single cell includes the battery shell, a sealing nail and the insulating coating. The insulating member is arranged on the box body. When the single cell is installed in the box body, the first surface of the battery shell is opposite to the insulating member.

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