Battery device

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device which comprises a cylindrical battery, a conducting bar and an insulating part, the cylindrical battery is provided with a first end face, the first end face is provided with a first area and a second area, a pole of the cylindrical battery extends out of the first area, and the second area is provided with an anti-explosion valve; the conducting bar comprises a first part and a second part, the first part is connected to the pole, and the second part is connected to the first part; at least part of the insulating part is located between the second part and the second area, the plane where the first end face is located serves as a datum plane, and at least part of orthographic projection of the anti-explosion valve is located in the orthographic projection range of the insulating part on the datum plane.

Description

Technical Field

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

[0002] In the existing design of the battery device, the explosion-proof valve is set on the top cover plate of the cylindrical battery. After the conductive bar is welded to the pole and the shell at the integrated level on the top of the cylindrical battery, when the cylindrical battery has thermal runaway, the conductive bar may be involved and difficult to open the valve, and the valve may short-circuit after opening. Utility Model Content

[0003] A main purpose of the utility model is to overcome at least one defect of the above-mentioned prior art and provide a battery device that can realize directional valve opening of cylindrical batteries while avoiding overlapping short circuit between the conductive bar and the battery cover.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] According to one aspect of the utility model, a battery device is provided, which includes a cylindrical battery, a conductive bar and an insulating member, wherein the cylindrical battery has a first end face, the first end face has a first area and a second area, the pole of the cylindrical battery extends from the first area, and the second area is provided with an explosion-proof valve; the conductive bar includes a first part and a second part, the first part is connected to the pole, and the second part is connected to the first part; at least part of the insulating member is located between the second part and the second area, and the plane where the first end face is located is taken as a reference plane. On the reference plane, at least part of the orthographic projection of the explosion-proof valve is located within the range of the orthographic projection of the insulating member.

[0006] It can be seen from the above technical solutions that the advantages and positive effects of the battery device proposed by the utility model are:

[0007] The battery device proposed in the utility model includes a cylindrical battery conductive row and an insulating member. The first end face of the cylindrical battery has a first area and a second area. The pole of the cylindrical battery extends from the first area, and the second area is provided with an explosion-proof valve. The conductive row includes a first part and a second part, the first part is connected to the pole, and the second part is connected to the first part. The insulating member is at least partially located between the second part and the second area, and at least part of the positive projection of the explosion-proof valve is located within the range of the positive projection of the insulating member. Through the above structural design, the utility model can use the insulating member to limit and reduce the internal deformation of the battery cover in the explosion-proof valve area, causing the explosion-proof valve to rupture in the area where the valve is expected to open, thereby achieving directional opening of the valve in a fixed area. Furthermore, when the explosion-proof valve opens, since the insulating member is located on the opposite side of the folded valve opening, the utility model can use the insulating member to avoid the problem of overlapping short circuit between the conductive row on this side and the battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0009] Figure 1 is a schematic three-dimensional structural diagram showing a partial structure of a battery device according to an exemplary embodiment;

[0010] Figure 2 yes Figure 1 Schematic diagram of the plane;

[0011] Figure 3 along Figure 2 Schematic diagram of the cross section made by the straight line BB in;

[0012] Figure 4 yes Figure 3 A schematic cross-sectional view of the structure shown in another state;

[0013] Figure 5 and Figure 6 They are partial enlarged schematic diagrams of cylindrical batteries in two different states;

[0014] Figure 7 yes Figure 1 A schematic diagram of the three-dimensional structure of the conductive bar is shown;

[0015] Figure 8 yes Figure 1 A schematic diagram of the three-dimensional structure of the isolation plate is shown.

[0016] The following are the descriptions of the reference numerals:

[0017] 200. Cylindrical battery;

[0018] 201. Battery pack;

[0019] 210. Battery cover;

[0020] 211. Explosion-proof valve;

[0021] 220. Pole;

[0022] 300. Conductive bar;

[0023] 310. Part I;

[0024] 320. Part II;

[0025] 330. Pre-fold weakening zone;

[0026] 331. Depression;

[0027] 332. bulge;

[0028] 400. Isolation board;

[0029] 410. Insulation parts;

[0030] 420. Open your mouth;

[0031] A2. Second area;

[0032] H1.Thickness;

[0033] H2. Height;

[0034] H3.Thickness;

[0035] G. First gap;

[0036] S1. First surface;

[0037] S2. Second surface;

[0038] X. First direction. DETAILED DESCRIPTION

[0039] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0040] In the following description of different exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "above", "between", "within", etc. can be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0041] See also Figure 1, which is a three-dimensional schematic diagram of a partial structure of the battery device proposed by the utility model, which specifically shows the combined structure of at least a portion of the cylindrical batteries of the battery pack of the battery device and a portion of the conductive bar and the isolation plate. In this exemplary embodiment, the battery device proposed by the utility model is described by taking a vehicle-mounted battery as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the utility model to other types of battery devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the battery device proposed by the utility model.

[0042] like Figure 1 As shown, in one embodiment of the present invention, the battery device provided by the present invention includes a battery box and a battery, and the battery is arranged in the battery box. Among them, the battery is a cylindrical battery 200. Figures 2 to 8 , Figure 2 Representatively shown in Figure 1 Schematic diagram of the plane; Figure 3 Representatively shown in Figure 2 A schematic cross-sectional view of the straight line BB in FIG. 1 , which specifically shows a partial cross-sectional structure of the cylindrical battery 200 when the valve is not opened; Figure 4 Representatively shown in Figure 3 A schematic cross-sectional view of the structure shown in another state, in which a partial cross-sectional structure of the cylindrical battery 200 in the valve-opening state is specifically shown; Figure 5 and Figure 6 2 are representative partial enlarged schematic diagrams of the cylindrical battery 200 in two different states, wherein the partial enlarged structures of the cylindrical battery 200 in the valve-unopened state and the valve-opened state are specifically shown; Figure 7 A three-dimensional structural schematic diagram of a conductive bar 300 is representatively shown in FIG. Figure 8 The three-dimensional structure diagram of the isolation plate 400 is representatively shown in FIG. The structure, connection mode and functional relationship of each main component of the battery device proposed by the utility model will be described in detail below in conjunction with the above drawings.

[0043] like Figures 1 to 7As shown, in one embodiment of the present utility model, the cylindrical battery 200 includes a shell, a battery cover 210 and an insulating member 410, and the outer surface of the battery cover 210 (that is, the side facing away from the battery cell) is a first end surface, and the first end surface is connected to the conductive bar 300. Specifically, the first end surface has a first area and a second area A2, the pole 220 of the cylindrical battery 200 extends from the first area of ​​the first end surface, and the second area A2 is provided with an explosion-proof valve 211. The conductive bar 300 includes a first part 310 and a second part 320, the first part 310 is connected to the first end surface, and the second part 320 is connected to the first part 310. At least part of the insulating member 410 is located between the second part 320 of the conductive bar 300 and the second area A2 of the first end surface. Among them, the plane where the first end surface is located is taken as the reference plane, and on this reference plane, at least part of the orthographic projection of the explosion-proof valve 211 is located within the range of the orthographic projection of the insulating member 410.

[0044] According to the valve opening position and direction of the explosion-proof valve 211 of the cylindrical battery 200, there are expected valve opening areas and expected non-valve opening areas. The area where the explosion-proof valve 211 and the conductive bar 300 (for example, the second part 320) have overlapping projections is the expected non-valve opening area of ​​the explosion-proof valve 211. This is because if the explosion-proof valve 211 is opened and flipped up in this area, it is easy to overlap with the conductive bar 300 above and cause a short circuit in the entire high-voltage system. In this regard, the utility model can use the insulating member 410 to limit and reduce the internal deformation of the battery cover 210 in the area of ​​the explosion-proof valve 211, causing the explosion-proof valve 211 to rupture in the area where the valve is expected to open, thereby achieving directional opening of the valve in a certain area. Furthermore, when the explosion-proof valve 211 is opened, since the insulating member 410 is located on the opposite side of the flip-open valve (for example Figure 4 and Figure 6 As shown), the present invention can utilize the insulating member 410 to prevent the conductive bar 300 on this side from overlapping and short-circuiting with the battery cover 210.

[0045] like Figures 3 to 6As shown, in one embodiment of the utility model, the second area A2 of the first end face may be provided with a thinning area, and the thinning area may adopt a groove structure, thereby, the thinning area can form the above-mentioned explosion-proof valve 211. Among them, on the above-mentioned reference plane, the positive projection of the thinning area may be a circular ring. In this regard, in order to manufacture a directional valve opening area, the existing scheme usually designs the shape of the explosion-proof valve 211. For example, the explosion-proof valve 211 is designed as a non-closed notch, and the non-closed area of ​​the cover plate is used as the flip axis to realize the flipping and opening of the valve. However, in the design of the cylindrical battery 200, if the explosion-proof valve 211 is set to the above-mentioned asymmetric shape, the cylindrical battery 200 needs to take into account its placement direction during the assembly process, which increases the difficulty of assembly and greatly reduces the assembly efficiency. In contrast, the utility model designs the explosion-proof valve 211 of the thinned area into a circular ring, that is, a symmetrical and completely closed shape with the corresponding center of the circular ring as the center of symmetry. Therefore, there is no need to consider the placement direction of each cylindrical battery 200 during assembly, which can greatly improve the grouping efficiency.

[0046] In one embodiment of the present invention, the second portion 320 of the conductive bar 300 may include a connecting portion and a bridging portion, wherein the connecting portion is connected to the housing of the adjacent cylindrical battery 200, and the bridging portion is connected between the connecting portion and the first portion 310. Accordingly, at least a portion of the insulating member 410 is disposed between the bridging portion and the second area A2. In some embodiments, another portion of the insulating member 410 may also be disposed on a side surface of the connecting portion facing the cylindrical battery 200.

[0047] like Figure 1 , Figure 2 and Figure 8 As shown, in one embodiment of the present invention, the battery device proposed by the present invention may further include a battery pack 201 and an isolating plate 400, wherein the battery pack 201 includes at least two cylindrical batteries 200, and the isolating plate 400 is disposed between the battery pack 201 and the conductive bar 300. In other words, the isolating plate 400 is integrally connected to the entire group of cylindrical batteries 200 of the battery pack 201. On this basis, the insulating member 410 may be a part of the isolating plate 400. Through the above structural design, the present invention can arrange the insulating members 410 of all cylindrical batteries 200 in the same battery pack 201 through the arrangement of the isolating plate 400, thereby greatly improving the grouping efficiency, reducing the number of components, and further ensuring the positioning accuracy of each insulating member 410 between the corresponding cylindrical battery 200 and the conductive bar 300.

[0048] like Figure 1 , Figure 2 and Figure 8As shown, based on the structural design that the battery device includes an isolation plate 400 and the insulating member 410 is a part of the isolation plate 400, in one embodiment of the utility model, the isolation plate 400 can be provided with at least two openings 420 that penetrate along the thickness direction, and the at least two openings 420 are arranged corresponding to at least two cylindrical batteries 200 belonging to the same battery pack 201, respectively, and accordingly, the first portion 310 of the conductive bar 300 and the first area of ​​the first end surface (such as the pole 220) can be connected through the opening 420. On this basis, the insulating member 410 can be a part of the isolation plate 400 adjacent to the opening 420. Through the above structural design, the utility model uses the insulating member 410 as a part of the isolation plate 400 adjacent to the opening 420, that is, the insulating member 410 participates in the formation of the opening 420, and the structure is simple and the arrangement is convenient.

[0049] In one embodiment of the present invention, the insulating member 410 and the second area A2 of the first end surface may be connected by adhesive bonding.

[0050] like Figure 3 As shown, in one embodiment of the present invention, along the axial direction of the cylindrical battery 200 (for example, the first direction X shown in the figure, the first direction X is perpendicular to the first end face), the gap between the second portion 320 and the second area A2 is the first gap G, and the ratio of the thickness H1 of the insulating member 410 to the first gap G can be 0.2 to 1, for example, 0.2, 0.5, 0.7, 0.9, 1, etc. In other words, the thickness H1 of the insulating member 410 can be less than the first gap G, or can be equal to the first gap G. Through the above structural design, the present invention can avoid the thickness H1 of the insulating member 410 being too small to provide sufficient fixing and pressing effect during the valve spraying process, and avoid the insulating member 410 being directly lifted up by high pressure during the valve spraying process. At the same time, the present invention can avoid the thickness H1 of the insulating member 410 being too large (that is, greater than the first gap G) and continuously pressing the conductive bar 300, and avoid structural fatigue or damage to the welding wire caused by the conductive bar 300 being pressed. In some embodiments, the ratio of the thickness H1 of the insulating member 410 to the first gap G may also be less than 0.2, such as 0.19, etc., and is not limited to this embodiment.

[0051] In one embodiment of the present invention, on the above-mentioned reference plane, at least part of the orthographic projection of the insulating member 410 overlaps with part of the orthographic projection of the second area A2 of the first end face; on this basis, the ratio of the area of ​​the part of the second area A2 of the first end face that overlaps with the orthographic projection of the insulating member 410 to the area of ​​the rest of the second area A2 can be 1:4 to 1:1, for example, 1:4, 1:3, 2:5, 1:2, 1:1, etc. In other words, the expected non-valve opening area of ​​the second area A2 (that is, the part of the second area A2 that overlaps with the orthographic projection of the insulating member 410) accounts for 20% to 50% of the total area of ​​the second area A2. Through the above-mentioned structural design, the present invention can avoid the overlapping part of the projection of the first end face and the insulating member 410 being too small, thereby avoiding the insulating member 410 from being pushed open and displaced during the valve spraying process and failing to achieve the preset effect; at the same time, the present invention can avoid the overlapping part of the above-mentioned projection being too large, which makes it difficult to fold and affect the normal valve opening. In some embodiments, the ratio of the area of ​​the portion of the second region A2 of the first end surface that overlaps with the insulating member 410 in its orthographic projection to the area of ​​the rest of the second region A2 may be less than 1:4, or may be greater than 1:1, for example, 1:5, 10:9, etc., and is not limited to this embodiment.

[0052] like Figures 5 to 7 As shown, in one embodiment of the present invention, the conductive bar 300 may have a pre-folded weakened area 330, and the pre-folded weakened area 330 is located at the second portion 320 (such as the above-mentioned bridging portion) of the conductive bar 300. The pre-folded weakened area 330 may be a fold. For example, the conductive bar 300 may be stamped to form the fold. In addition, referring to Figure 4 and Figure 6 , because when the valve is opened, based on the setting of the pre-folding weakening zone 330, a part of the second part 320 will be bent relative to the first part 310 toward the side away from the cylindrical battery 200, so the concave 331 of the fold can be located on the surface of the side of the conductive bar 300 facing away from the cylindrical battery 200. Through the above structural design, the utility model can make the conductive bar 300 easy to deform and bend preferentially in the pre-folding weakening zone 330, play a folding guide role after the explosion-proof valve 211 is opened, and avoid the conductive bar 300 being involved and making it difficult to open the valve. In some embodiments, the pre-folding weakening zone 330 can also adopt other structural designs, such as but not limited to a dent, a width narrowing structure (that is, the width of the second part 320 is reduced in this area to form a "waist" part), etc. Furthermore, the pre-folding weakening zone 330 can also be located at the connection between the first part 310 and the second part 320 of the conductive bar 300, and is not limited to this embodiment.

[0053] like Figure 3As shown, based on the structural design that the second portion 320 has a pre-folded weakened area 330, in one embodiment of the present utility model, the pre-folded weakened area 330 can be a fold, and the conductive bar 300 has a first surface S1 away from the cylindrical battery 200 and a second surface S2 facing the cylindrical battery 200, and the fold forms a depression 331 on the first surface S1, and a protrusion 332 is formed at a position corresponding to the depression 331 on the second surface S2. On this basis, along the axial direction of the cylindrical battery 200, such as the first direction X shown in the figure, the gap between the second portion 320 of the conductive bar 300 and the second area A2 of the first end surface is the first gap G, and the sum of the height H2 of the protrusion 332 and the thickness H1 of the insulating member 410 is the height sum, and the ratio of the height sum to the first gap G can be 1:5 to 9:10, such as 1:5, 1:3, 1:2, 3:5, 7:8, 9:10, etc. In other words, the above-mentioned height sum can be less than the first gap G, or can be equal to the first gap G. Through the above structural design, the utility model can prevent the sum of the height H2 of the protrusion 332 and the thickness H1 of the insulating member 410 from being too small to provide sufficient fixing and pressing effect during the valve spraying process, and prevent the insulating member 410 from being directly lifted up due to high pressure during the valve spraying process. At the same time, the utility model can prevent the above height sum from being too large (i.e., greater than the first gap G) and continuously pressing the conductive bar 300, and prevent the conductive bar 300 from being subjected to the pressure and causing structural fatigue or damage to the welding wire. In some embodiments, the ratio of the sum of the height H2 of the protrusion 332 and the thickness H1 of the insulating member 410 to the first gap G can also be less than 1:5, or can be greater than 9:10, such as 1:6, 10:11, etc., and is not limited to this embodiment.

[0054] like Figure 3 As shown, in one embodiment of the present invention, still taking the structural design that the second part 320 has a pre-folding weakening area 330 and the pre-folding weakening area 330 is a fold as an example, along the axial direction of the cylindrical battery 200 (for example, the first direction X), the ratio of the height H2 of the protrusion 332 to the thickness H3 of the second part 320 can be 1:5 to 9:10, for example, 1:5, 3:10, 1:2, 2:3, 4:5, 9:10, etc. Through the above structural design, the present invention can avoid the bending amplitude of the fold on the conductive bar 300 being too large to affect the structural strength of the conductive bar 300, and can also avoid the bending amplitude of the fold being too small to make its preset effect as the pre-folding weakening area 330 not obvious enough.

[0055] In one embodiment of the present invention, on the above-mentioned reference plane, the orthographic projection of the pole 220 can be located within the range of the outline enclosed by the orthographic projection of the explosion-proof valve 211. Taking the orthographic projection of the explosion-proof valve 211 (thinning area) as an annular shape as an example, the orthographic projection of the pole 220 can be located within the range of the annular orthographic projection of the explosion-proof valve 211. Through the above-mentioned structural design, the present invention can realize that after the spray valve ruptures, the associated parts (such as the local area of ​​the battery cover 210 involving the explosion-proof valve 211, the pole 220 and the conductive bar 300, etc.) are folded together to open the valve, which is conducive to rapid heat dissipation, and can disconnect the electrical connection of the abnormal battery cell to avoid heat spread.

[0056] It should be noted that the battery devices shown in the drawings and described in this specification are only a few examples of many battery devices that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the battery devices shown in the drawings or described in this specification.

[0057] In summary, the battery device proposed in the utility model includes a cylindrical battery 200, a conductive bar 300 and an insulating member 410. The first end surface of the cylindrical battery 200 has a first area and a second area A2. The pole 220 of the cylindrical battery 200 extends from the first area, and the second area A2 is provided with an explosion-proof valve 211. The conductive bar 300 includes a first part 310 and a second part 320. The first part 310 is connected to the pole 220, and the second part 320 is connected to the first part 310. The insulating member 410 is at least partially located between the second part 320 and the second area A2, and at least part of the orthographic projection of the explosion-proof valve 211 is located within the range of the orthographic projection of the insulating member 410. Through the above structural design, the utility model can use the insulating member 410 to limit and reduce the internal deformation of the battery cover 210 in the area of ​​the explosion-proof valve 211, so as to cause the explosion-proof valve 211 to rupture in the area where the valve is expected to be opened, thereby realizing the directional opening of the valve in a certain area. Furthermore, when the explosion-proof valve 211 is opened, since the insulating member 410 is located on the opposite side of the folded open valve, the utility model can use the insulating member 410 to prevent the conductive bar 300 on that side from being overlapped and short-circuited with the battery cover 210 .

[0058] The exemplary embodiments of the battery device proposed by the utility model are described and / or illustrated in detail above. However, the embodiments of the utility model are not limited to the specific embodiments described here. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described here. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated here, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to indicate the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.

[0059] Although the battery device of the present invention has been described according to various specific embodiments, those skilled in the art will recognize that the present invention can be implemented with modifications within the spirit and scope of the claims.

Claims

1. A battery device, characterized in that: include: A cylindrical battery having a first end face, wherein the first end face has a first area and a second area, the pole of the cylindrical battery extends from the first area, and the second area is provided with an explosion-proof valve; A conductive bar, comprising a first portion and a second portion, wherein the first portion is connected to the pole, and the second portion is connected to the first portion; as well as The insulating member is at least partially located between the second portion and the second area. The plane where the first end surface is located is used as a reference plane. On the reference plane, at least part of the orthographic projection of the explosion-proof valve is located within the range of the orthographic projection of the insulating member.

2. The battery device according to claim 1, characterized in that: The second region is provided with a thinning area, the thinning area forms the explosion-proof valve, and on the reference plane, the orthographic projection of the thinning area is a circular ring.

3. The battery device according to claim 1, characterized in that: The battery device further comprises a battery pack and an isolating plate. The battery pack comprises at least two cylindrical batteries. The isolating plate is arranged between the battery pack and the conductive bar. The insulating member is a part of the isolating plate.

4. The battery device according to claim 3, characterized in that: The isolation plate is provided with at least two openings penetrating along the thickness direction, and the at least two openings respectively correspond to at least two cylindrical batteries belonging to the same battery pack, so that the first part and the first area are connected through the openings; wherein the insulating member is a part of the isolation plate adjacent to the opening.

5. The battery device according to claim 1, characterized in that: The insulating member is adhesively connected to the second region.

6. The battery device according to claim 1, characterized in that: Along the axial direction of the cylindrical battery, a gap between the second portion and the second region is a first gap, and a ratio of a thickness of the insulating member to the first gap is 0.2-1.

7. The battery device according to claim 1, characterized in that: On the reference plane, at least part of the orthographic projection of the insulating member overlaps with part of the orthographic projection of the second region; wherein the ratio of the area of ​​the portion of the second region that overlaps with the orthographic projection of the insulating member to the area of ​​the rest of the second region is 1:4 to 1:

1.

8. The battery device according to any one of claims 1 to 7, characterized in that: The conductive bar has a pre-folded weakening area, the pre-folded weakening area is located at the second part or at the connection between the first part and the second part, and the pre-folded weakening area is a fold, a dent or a width narrowing structure.

9. The battery device according to claim 8, characterized in that: The pre-fold weakening area is a fold, the conductive bar has a first surface facing away from the cylindrical battery and a second surface facing the cylindrical battery, the fold forms a depression on the first surface, and a protrusion is formed at a position corresponding to the depression on the second surface; wherein, along the axial direction of the cylindrical battery, the gap between the second part and the second area is a first gap, the sum of the height of the protrusion and the thickness of the insulating member is a height sum, and the ratio of the height sum to the first gap is 0.2 to 1.

10. The battery device according to claim 8, characterized in that: The pre-fold weakening area is a fold, the conductive bar has a first surface facing away from the cylindrical battery and a second surface facing the cylindrical battery, the fold forms a depression on the first surface, and a protrusion is formed at a position corresponding to the depression on the second surface; wherein, along the axial direction of the cylindrical battery, the ratio of the height of the protrusion to the thickness of the second part is 1:5 to 9:

10.

11. The battery device according to any one of claims 1 to 7, characterized in that: On the reference plane, the orthographic projection of the pole is located within the range of the outline enclosed by the orthographic projection of the explosion-proof valve.

Images