Battery cover plate and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate and a battery monomer, the battery cover plate comprises a cover plate body, a plastic part and an anti-explosion valve, a protruding structure is arranged on the cover plate body, the plastic part and the cover plate body are arranged at an interval and connected, the protruding structure is located between the plastic part and the cover plate body, the anti-explosion valve is arranged on the cover plate body, and the anti-explosion valve is arranged on the cover plate body. The protruding structure is arranged around the anti-explosion valve, the battery cover plate is arranged on the battery shell in a covering mode, when the plastic part is melted, the protruding structure around the anti-explosion valve can play a role in limiting the pole group and preventing the pole group from blocking the anti-explosion valve, and the effect of improving the safety performance of the single battery is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery cover plate and battery monomer. BACKGROUND

[0002] Lithium ion battery has become the representative of modern high performance battery because of its high working voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight and small size.

[0003] In the existing lithium ion battery, the cover plate and the shell are welded and sealed to package the pole group inside, wherein the side surface of the cover plate facing the pole group is provided with a lower plastic, and the lower plastic abuts against the top of the pole group to limit the pole group.

[0004] At present, the lower plastic is usually made of PP material, and its melting point is generally about 150 DEG C. When the lithium ion battery is in thermal runaway, the temperature inside the shell is much higher than 150 DEG C, which causes the lower plastic to melt, thereby losing the limiting effect on the pole group. In addition, when the lithium ion battery is in thermal runaway, the air pressure inside the shell rises rapidly, so that the explosion-proof valve on the cover plate opens to discharge the high-pressure gas in the shell. However, since the lower plastic loses the limiting effect on the pole group after melting, the pole group moves with the high-pressure gas in the shell and blocks the explosion-proof valve, greatly reducing the exhaust effect of the explosion-proof valve, and thereby reducing the safety performance of the lithium ion battery.

[0005] Therefore, it is urgent to provide a battery cover plate and a battery monomer to solve the above technical problems. UTILITY MODEL CONTENTS

[0006] The first purpose of the utility model is to provide a battery cover plate, when the plastic part melts, the convex structure can prevent the pole group from blocking the explosion-proof valve.

[0007] To achieve this purpose, the utility model adopts the following technical scheme:

[0008] The battery cover plate comprises:

[0009] The cover plate body is provided with a convex structure;

[0010] The plastic part is arranged and connected between the cover plate body and the convex structure.

[0011] The explosion-proof valve is arranged on the cover plate body, and the convex structure surrounds the explosion-proof valve.

[0012] Optionally, the explosion-proof valve is of a symmetrical structure, the explosion-proof valve comprises a first side wall group, the first side wall group comprises a first center line and two first side walls, the two first side walls are symmetrically arranged about the first center line, the protruding structure comprises a protruding part group, the protruding part group comprises a second center line and two protruding parts, the two protruding parts are symmetrically arranged about the second center line, the second center line intersects the first center line and is arranged at an included angle.

[0013] Optionally, the number of the protruding part groups is at least two groups, and the second center lines of the at least two groups of protruding part groups do not overlap.

[0014] Optionally, the second center lines of the at least two groups of protruding part groups intersect the first center line at the same position.

[0015] Optionally, the number of the protruding part groups is two groups, and the second center lines of the two groups of protruding part groups are mirror images about the first center line.

[0016] Optionally, the included angle between the two adjacent protruding parts on the same side of the first center line is β, and 50°≤β≤170°.

[0017] Optionally, the protruding structure comprises a plurality of protruding parts, and the plurality of protruding parts are uniformly distributed along the circumference of the explosion-proof valve.

[0018] Or, the protruding structure comprises a protruding part, and the protruding part extends along the circumference of the explosion-proof valve and is connected at the head and tail.

[0019] Optionally, the distance between the protruding part and the explosion-proof valve is C, and 2mm≤C≤6mm.

[0020] Optionally, the edge of the plastic part is provided with a folding edge, the folding edge is folded towards the direction of the cover plate body, and the folding edge is connected with the cover plate body.

[0021] The second purpose of the utility model is to provide a battery monomer, which has high safety.

[0022] To achieve this purpose, the utility model adopts the following technical scheme:

[0023] The battery monomer comprises a battery shell, a pole group and the battery cover plate, the pole group is arranged in the battery shell, the cover plate body is arranged at the opening of the battery shell, and the plastic part is arranged on the side of the cover plate body facing the pole group.

[0024] The utility model has the advantages of:

[0025] The battery cover provided by this utility model has a protruding structure on the cover body. An explosion-proof valve is installed on the cover body, and the protruding structure surrounds the explosion-proof valve. A plastic part is spaced apart from and connected to the cover body. The protruding structure is located between the plastic part and the cover body. When the battery cover is placed on the battery case, when the plastic part melts, the protruding structure surrounding the explosion-proof valve can limit the electrode assembly, preventing the electrode assembly from blocking the explosion-proof valve. This leaves an exhaust channel between the electrode assembly and the explosion-proof valve, allowing high-pressure gas inside the battery case to be discharged from the battery case through the exhaust channel. It can be seen that this battery cover has the effect of improving the safety performance of the battery cell. Attached Figure Description

[0026] Figure 1 This is an exploded structural diagram of the battery cover provided in Embodiment 1 of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the cover plate body provided in Embodiment 1 of this utility model. Figure 1 ;

[0028] Figure 3 This is a schematic diagram of the explosion-proof valve provided in Embodiment 1 of this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the cover plate body provided in Embodiment 1 of this utility model. Figure 2 .

[0030] In the picture:

[0031] 100. Cover plate body; 110. Protruding structure; 111. Protruding part assembly; 1111. Second center line; 1112. Protruding part; 200. Plastic part; 210. Folded edge; 300. Explosion-proof valve; 310. First side wall assembly; 311. First center line; 312. First side wall; 320. Second side wall assembly; 321. Third center line; 322. Second side wall. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0035] In the description of the embodiment, the terms "on", "under", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0036] Embodiment one

[0037] The embodiment provides a battery cover plate, when the plastic part is fused, the convex structure can prevent the pole group from blocking the explosion-proof valve.

[0038] Specifically, as shown in Figure 1 And Figure 2 The battery cover plate includes a cover plate body 100, a plastic part 200 and an explosion-proof valve 300, wherein the cover plate body 100 is provided with a convex structure 110, the plastic part 200 is arranged and connected with the cover plate body 100, the convex structure 110 is located between the plastic part 200 and the cover plate body 100, the explosion-proof valve 300 is arranged on the cover plate body 100, and the convex structure 110 is arranged around the explosion-proof valve 300.

[0039] Based on the above design, the cover plate body 100 is provided with a protruding structure 110, the explosion-proof valve 300 is arranged on the cover plate body 100, the protruding structure 110 is arranged around the explosion-proof valve 300, the plastic part 200 is arranged in a spaced manner and connected with the cover plate body 100, the protruding structure 110 is located between the plastic part 200 and the cover plate body 100, the battery cover plate cover is arranged on the battery shell, when the plastic part 200 is melted, the protruding structure 110 around the explosion-proof valve 300 can limit the pole group, prevent the pole group from blocking the explosion-proof valve 300, so that an exhaust passage is left between the pole group and the explosion-proof valve 300, and the high-pressure gas in the battery shell can be discharged from the exhaust passage. It can be seen that the battery cover plate provided in the embodiment has the effect of improving the safety performance of the battery monomer.

[0040] On the other hand, the battery cover plate provided in the embodiment does not need to increase other components, only needs to change the structure of the cover plate body 100, that is, only needs to arrange the protruding structure 110 on the cover plate body 100, so that the limiting effect on the pole group can be achieved when the plastic part 200 is melted. It can be seen that the battery cover plate provided in the embodiment has the effect of improving the safety performance of the battery monomer.

[0041] On the other hand, the battery cover plate provided in the embodiment does not need to increase other components, only needs to change the structure of the cover plate body 100, that is, only needs to arrange the protruding structure 110 on the cover plate body 100, so that the limiting effect on the pole group can be achieved when the plastic part 200 is melted. It can be seen that the battery cover plate provided in the embodiment has the effect of improving the safety performance of the battery monomer.

[0042] Optionally, as shown in Figure 1 and Figure 2 , the edge of the plastic part 200 is provided with a folded edge 210, the folded edge 210 is folded towards the direction of the cover plate body 100, and the folded edge 210 is connected with the cover plate body 100, so as to realize the spaced arrangement and connection of the plastic part 200 and the cover plate body 100.

[0043] Further, the folded edge 210 extends along the circumference of the plastic part 200 and is connected in a head-to-tail manner, so as to improve the reliability of the connection between the folded edge 210 and the cover plate body 100.

[0044] Optionally, as shown in Figures 1 to 3As shown, the explosion-proof valve 300 is a symmetrical structure, the explosion-proof valve 300 comprises a first side wall group 310, the first side wall group 310 comprises a first center line 311 and two first side walls 312, the two first side walls 312 are symmetrically arranged about the first center line 311, the convex structure 110 comprises a convex group 111, the convex group 111 comprises a second center line 1111 and two convex portions 1112, the two convex portions 1112 are symmetrically arranged about the second center line 1111, the second center line 1111 intersects the first center line 311 and is arranged at an angle, for example, the angle between the second center line 1111 and the first center line 311 can be 30°, 80° or 135°, etc., so that the distance between the two convex portions 1112 in the same convex group 111 and the explosion-proof valve 300 is equal, and the uniformity of the distribution of the convex structure 110 in the circumferential direction of the explosion-proof valve 300 is also improved, thereby improving the uniformity of the limiting effect of the pole group in the circumferential direction of the explosion-proof valve 300.

[0045] Further, the number of convex groups 111 is at least two, the second center lines 1111 of the at least two convex groups 111 do not overlap each other, further improving the uniformity of the distribution of the convex structure 110 in the circumferential direction of the explosion-proof valve 300. For example, the number of convex groups 111 can be two, three or six, etc.

[0046] Further, the second center lines 1111 of the at least two convex groups 111 intersect the first center line 311 at the same position, to further improve the uniformity of the distribution of the convex structure 110 in the circumferential direction of the explosion-proof valve 300.

[0047] Further, when the explosion-proof valve 300 is a relatively regular symmetrical structure such as a racetrack shape, a circle or a square, the number of convex groups 111 is two, the second center lines 1111 of the two convex groups 111 are mirror image arranged about the first center line 311, achieving the effect of further improving the uniformity of the distribution of the convex structure 110 in the circumferential direction of the explosion-proof valve 300.

[0048] Optionally, as shown, Figures 1 to 4 The angle between the two adjacent convex portions 1112 on the same side of the first center line 311 is β, 50°≤β≤170°, for example, β can be 50°, 65°, 100°, 160° or 170°, etc., so that the distance between the two adjacent convex portions 1112 on the same side of the first center line 311 is appropriate, ensuring that the distribution of the convex structure 110 in the circumferential direction of the explosion-proof valve 300 is relatively uniform.

[0049] Optionally, as shown, Figures 1 to 4As shown, the distance between the protruding portion 1112 and the explosion-proof valve 300 is C, 2mm≤C≤6mm, C can be 2mm, 3mm, 5mm or 6mm, etc., so as to improve the reliability of the limiting effect of the protruding structure 110 on the pole group, and at the same time avoid the problem of increasing the assembly difficulty of the explosion-proof valve 300 and the cover plate body 100 due to the too small distance between the protruding portion 1112 and the explosion-proof valve 300.

[0050] In the embodiment, as shown in the figure, Figures 1 to 4 As shown, the first side wall 312 is arc-shaped, and the explosion-proof valve 300 further comprises a second side wall group 320, the second side wall group 320 comprises a third middle line 321 and two second side walls 322, the two second side walls 322 are symmetrically arranged about the third middle line 321, the second side wall 322 is straight, and the third middle line 321 passes through the intersection of the second middle line 1111 and the first middle line 311, and the third middle line 321 is perpendicular to the first middle line 311, that is, in the embodiment, the explosion-proof valve 300 is a runway-shaped structure. Of course, in other embodiments, the explosion-proof valve 300 can also be circular, square or other structures, which will not be listed one by one here.

[0051] In the embodiment, two protruding portions 1112 in the same protruding portion group 111 correspond to two first side walls 312 one by one, the protruding portion 1112 is approximately a strip-shaped structure, and the extension direction of the protruding portion 1112 is parallel to the tangent direction of the first side wall 312 corresponding to the protruding portion 1112. The distance C between the above-mentioned protruding portion 1112 and the explosion-proof valve 300 is the distance between the protruding portion 1112 and the tangent of the first side wall 312 corresponding to the protruding portion 1112.

[0052] The embodiment also provides a battery monomer, which comprises a battery shell, a pole group and the above-mentioned battery cover plate, the pole group is arranged in the battery shell, the cover plate body 100 is arranged at the opening of the battery shell, and the plastic part 200 is located on the side of the cover plate body 100 facing the pole group. The battery monomer adopts the above-mentioned battery cover plate. When the battery monomer is in thermal runaway and the plastic part 200 is melted, the protruding structure 110 can limit the pole group, prevent the pole group from blocking the explosion-proof valve 300, leave an exhaust passage between the pole group and the explosion-proof valve 300, and the high-pressure gas in the battery shell can be discharged from the exhaust passage, thereby greatly improving the safety of the battery monomer.

[0053] Embodiment two

[0054] The embodiment provides a battery cover plate, which is different from the battery cover plate provided in embodiment one in that:

[0055] The convex structure 110 comprises a plurality of convex portions 1112, and the number of the convex portions 1112 can be two, three, five or eight, for example, and the plurality of convex portions 1112 are uniformly distributed along the circumference of the explosion-proof valve 300, so as to improve the uniformity of the convex structure 110 distributed along the circumference of the explosion-proof valve 300, and achieve the effect of improving the uniformity of the limiting effect of the convex structure 110 on the pole group along the circumference of the explosion-proof valve 300.

[0056] The remaining structure of the battery cover plate provided in the embodiment is the same as that of the battery cover plate provided in the first embodiment, and will not be repeated.

[0057] Embodiment three

[0058] The battery cover plate provided in the embodiment is different from the battery cover plate provided in the first embodiment in that:

[0059] The convex structure 110 comprises a convex portion 1112, and the convex portion 1112 extends along the circumference of the explosion-proof valve 300 and is connected at the head and tail, so as to improve the uniformity of the convex structure 110 distributed along the circumference of the explosion-proof valve 300, and achieve the effect of improving the uniformity of the limiting effect of the convex structure 110 on the pole group along the circumference of the explosion-proof valve 300.

[0060] The remaining structure of the battery cover plate provided in the embodiment is the same as that of the battery cover plate provided in the first embodiment, and will not be repeated.

[0061] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery cover plate, characterized by The application relates to a battery cover plate. The cover plate body (100) is provided with a convex structure (110); A plastic part (200) is arranged in a spaced manner with the cover plate body (100) and is connected, and the convex structure (110) is located between the plastic part (200) and the cover plate body (100); An explosion-proof valve (300) is arranged on the cover plate body (100), and the convex structure (110) is arranged around the explosion-proof valve (300).

2. The battery cover plate of claim 1, wherein, The explosion-proof valve (300) is of a symmetrical structure, and the explosion-proof valve (300) comprises a first side wall group (310) comprising a first middle line (311) and two first side walls (312) arranged in a symmetrical manner about the first middle line (311); the convex structure (110) comprises a convex part group (111) comprising a second middle line (1111) and two convex parts (1112) arranged in a symmetrical manner about the second middle line (1111); and the second middle line (1111) intersects the first middle line (311) and is arranged at an included angle.

3. The battery cover plate of claim 2, wherein, The number of the convex part groups (111) is at least two, and the second middle lines (1111) of the at least two convex part groups (111) do not overlap.

4. The battery cover plate of claim 3, wherein, The second middle lines (1111) of the at least two convex part groups (111) intersect the first middle line (311) at the same position.

5. The battery cover plate of claim 4, wherein, The number of the convex part groups (111) is two, and the second middle lines (1111) of the two convex part groups (111) are arranged in a mirror image manner about the first middle line (311).

6. The battery cover plate of claim 4, wherein, The included angle between two adjacent convex parts (1112) located on the same side of the first middle line (311) is beta, and 50 DEG <= beta <= 170 DEG.

7. The battery cover plate of claim 1, wherein, The convex structure (110) comprises a plurality of convex parts (1112) uniformly distributed along the circumference of the explosion-proof valve (300). Or, the convex structure (110) comprises a convex part (1112) extending along the circumference of the explosion-proof valve (300) and connected at the head and tail.

8. The battery cover plate of claim 2 or 7, wherein, The distance between the convex part (1112) and the explosion-proof valve (300) is C, and 2mm <= C <= 6mm.

9. The battery cover plate according to any one of claims 1-7, wherein, The edge of the plastic part (200) is provided with a folded edge (210) which is folded towards the cover plate body (100) and is connected with the cover plate body (100).

10. A battery cell, characterized by The application further relates to a battery comprising a battery shell, a pole group arranged in the battery shell, and the battery cover plate according to any one of claims 1-9, wherein the cover plate body (100) is arranged at the opening of the battery shell, and the plastic part (200) is located on the side of the cover plate body (100) facing the pole group.

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