Battery cell and battery pack

Abstract

The utility model provides a battery cell and a battery pack. The battery cell comprises a top cover, an anti-explosion valve and a protective patch; a mounting hole is formed in the top cover in a penetrating manner; the explosion-proof valve comprises a main body part and a connecting part connected to the periphery of the main body part, the connecting part is connected with the top cover, the main body part corresponds to the mounting hole, and at least part of the main body part extends into the mounting hole; the area of the protective patch is larger than that of the mounting hole, so that the protective patch can completely cover the mounting hole; the part, corresponding to the mounting hole, of the protective patch clings to the main body part, and the part, located on the periphery of the mounting hole, of the protective patch clings to the top cover. In the battery cell, as the area of the protective patch is larger than that of the mounting hole and the protective patch can completely cover the mounting hole, the protective patch can be attached to the top cover and the explosion-proof valve at the same time, and the explosion-proof valve and the top cover can apply attaching acting force to the protective patch, so that the protective patch is prevented from falling off, and the protective patch can provide relatively reliable protection for the main body part; and the risk that the anti-explosion valve is polluted is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery cell and a battery pack. BACKGROUND

[0002] In the related art, a protective patch (i.e., a PET patch) is usually attached to the explosion-proof valve of a battery cell to prevent the explosion-proof valve from being contaminated. However, the protective patch is prone to being poorly attached to the explosion-proof valve and easily falling off after being attached, thereby causing the explosion-proof valve to be at risk of being contaminated. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide a battery cell capable of reducing the risk of the explosion-proof valve being contaminated. Furthermore, a battery pack is also provided.

[0004] In a first aspect, the application provides a battery cell, comprising:

[0005] a top cover, which is provided with a mounting hole in a penetrating manner;

[0006] an explosion-proof valve, which comprises a main body portion and a connecting portion connected to the periphery of the main body portion, the connecting portion is connected to the top cover, the main body portion corresponds to the mounting hole, and at least part of the main body portion extends into the mounting hole; and

[0007] a protective patch, which has an area greater than that of the mounting hole and is capable of completely covering the mounting hole, a portion of the protective patch corresponding to the mounting hole is tightly attached to the main body portion, and a portion of the protective patch located at the periphery of the mounting hole is tightly attached to the top cover.

[0008] In the above battery cell, since the protective patch has an area greater than that of the mounting hole and is capable of completely covering the mounting hole, the middle region of the protective patch corresponding to the mounting hole can be tightly attached to the main body portion, and the edge region beyond the mounting hole can be tightly attached to the top cover. In this way, the explosion-proof valve and the top cover can both exert an attaching force on the protective patch, thereby hindering the protective patch from falling off. In addition, under the action of the attaching force exerted by the top cover on the edge region of the protective patch, the middle region of the protective patch can also be stably and firmly attached to the main body portion of the explosion-proof valve, so that the protective patch can provide more reliable protection for the main body portion, thereby reducing the risk of the explosion-proof valve being contaminated.

[0009] In one of the embodiments, a plane perpendicular to the center axis of the mounting hole is set as a predetermined plane, the area of the projection of the protective patch on the predetermined plane is S1, the area of the projection of the main body portion on the predetermined plane is S2, and S1 / S2=i, wherein 1

[0010] In one of the embodiments, the circumference of the main body part projected on the predetermined plane is L, and S2 / L=a, where 2.97≤a≤4.15.

[0011] In one of the embodiments, a pressure relief hole is formed through the portion of the protective patch corresponding to the mounting hole.

[0012] In one of the embodiments, the top cover has opposite inner and outer surfaces, the mounting hole penetrates through the inner and outer surfaces, the connecting part is connected to the inner surface, and the main body part matches the shape of the mounting hole.

[0013] In one of the embodiments, the outer surface is provided with a mounting groove having a bottom surface and a side peripheral surface connected to the edge of the bottom surface, and the mounting hole is located on the bottom surface; the protective patch has an upper surface and a lower surface opposite to the upper surface, the protective patch is accommodated in the mounting groove, and the lower surface is tightly attached to the bottom surface and the main body part.

[0014] In one of the embodiments, the protective patch has an outer peripheral surface connected between the upper surface and the lower surface, and the outer peripheral surface is tightly attached to the side peripheral surface; and / or, the upper surface is flush with the outer surface.

[0015] In one of the embodiments, the main body part includes an explosion part and a fitting part arranged around the explosion part, and the fitting part is higher than the side of the explosion part facing the protective patch; the fitting part is tightly attached to the lower surface, and the explosion part is arranged spaced apart from the lower surface.

[0016] In one of the embodiments, the side of the explosion part facing the lower surface is provided with a groove, and the groove extends in a long strip shape on the surface of the explosion part.

[0017] In one of the embodiments, the groove includes a first groove and a second groove, the second groove is located at the edge position of the explosion part and extends in an open ring shape along the edge of the explosion part, and the first groove is located within the ring shape surrounded by the second groove and extends in a "Y" shape.

[0018] In a second aspect, the embodiments of the present application provide a battery pack including the above-mentioned battery cell.

[0019] In the above-mentioned battery pack, the protective patch in the battery cell can provide more reliable protection for the explosion-proof valve, so that the risk of the explosion-proof valve being contaminated is reduced, and thus the safety factor of the battery pack is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] Figure 1 A perspective structural schematic diagram of the battery cell provided in the embodiments of the present application is shown in the figure.

[0022] Figure 2 A top view of the battery cell shown in the figure. Figure 1

[0023] Figure 3 A partial sectional view along A-A and an enlarged schematic view of the partial structure of the battery cell shown in the figure. Figure 2

[0024] Figure 4 A structural schematic diagram of the protective patch in the battery cell shown in the figure. Figure 3

[0025] Figure 5 A structural schematic diagram of the explosion-proof valve in the battery cell shown in the figure. Figure 3

[0026] In the figure, each reference sign represents:

[0027] 100, battery cell; 110, top cover; 111, mounting hole; 112, inner surface; 113, outer surface; 114, mounting groove; 115, bottom surface; 116, side peripheral surface; 120, explosion-proof valve; 121, connecting portion; 122, main body portion; 123, bursting portion; 123c, groove; 123a, first groove; 123b, second groove; 124, fitting portion; 130, protective patch; 131, pressure relief hole; 132, upper surface; 133, lower surface; 134, outer peripheral surface. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] ​​​​It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, specify the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In addition, the terms "first", "second" are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] Please refer to Figures 1 to 5 The electric core 100 provided by the embodiment of the present application will be described. The electric core 100 includes a top cover 110, an explosion-proof valve 120 and a protective patch 130. The top cover 110 is provided with a mounting hole 111. The explosion-proof valve 120 includes a main body 122 and a connecting part 121 connected to the periphery of the main body 122. The connecting part 121 is connected to the top cover 110, and the main body 122 corresponds to the mounting hole 111, and at least part of the main body 122 extends into the mounting hole 111. The area of the protective patch 130 is larger than the area of the mounting hole 111 and can completely cover the main body 122. The part of the protective patch 130 corresponding to the mounting hole 111 is in close contact with the main body 122, and the part of the protective patch 130 located outside the periphery of the mounting hole 111 is in close contact with the top cover 110.

[0033] It can be understood that the gas generated inside the electric core 100 will press the main body 122 of the explosion-proof valve 120 to force the main body 122 to deform. After the main body 122 is deformed to form a burst hole, the gas can be discharged through the burst hole. The connecting part 121 of the explosion-proof valve 120 is connected to the top cover 110 to prevent the main body 122 from being separated from the mounting hole 111 under the action of gas pressure.

[0034] The area of the protective patch 130 is greater than the mounting hole 111 and can completely cover the mounting hole 111, so that the middle region of the protective patch 130 corresponding to the mounting hole 111 can be tightly attached to the main body 122, and the edge region beyond the mounting hole 111 can be tightly attached to the top cover 110. In this way, the explosion-proof valve 120 and the top cover 110 can both exert a bonding force on the protective patch 130, thereby preventing the protective patch 130 from falling off. In addition, under the action of the bonding force exerted by the top cover 110 on the edge region of the protective patch 130, the middle region of the protective patch 130 can also be stably and firmly attached to the main body 122 of the explosion-proof valve 120, so that the protective patch 130 can provide more reliable protection for the main body 122, reducing the risk of contamination of the explosion-proof valve 120.

[0035] In combination Figure 1 and Figure 3 As shown in the drawings, in the present application, the top cover 110 has oppositely arranged inner and outer surfaces 112 and 113, and the mounting hole 111 penetrates the inner and outer surfaces 112 and 113. The connecting portion 121 is connected to the inner surface 112, and the main body 122 is matched in shape with the mounting hole 111. It can be understood that the connecting portion 121 can be fixedly connected to the inner surface 112 by means of adhesion or welding, thereby preventing the main body 122 from moving relative to the mounting hole 111. The "main body 122 is matched in shape with the mounting hole 111" can be understood as the main body 122 can be exactly inserted into the mounting hole 111, that is, the outer wall surface of the main body 122 surrounding the periphery is exactly in surface-to-surface contact with the inner wall surface surrounding the mounting hole 111. In this way, the inner wall surface surrounding the mounting hole 111 is in stable contact with the main body 122, and plays a limiting role on the main body 122, thereby making the main body 122 uniformly stressed under the action of gas pressure, improving the safety and reliability of the battery cell 100, and the middle region of the protective patch 130 corresponding to the mounting hole 111 also corresponds to the main body 122.

[0036] Specifically, a plane perpendicular to the center axis of the mounting hole 111 is set as a predetermined plane, the area of the protective patch 130 projected on the predetermined plane is S1, the area of the main body 122 projected on the predetermined plane is S2, and S1 / S2=i, then 1

[0037] Further, the circumference of the main body 122 projected on the predetermined plane is set as L, and S2 / L=a, then 2.97≤a≤4.15.

[0038] It is found through research that, for the main body 122, the longer the perimeter is under the same area, the better the fitting effect with the protective patch 130 is. Considering that the battery cell 100 needs to be designed with different areas of the main body 122 according to different weights, when the area of the main body 122 is fixed, the design of a larger perimeter is also limited. By limiting the ratio of the area S2 of the main body 122 to the perimeter L to 2.97mm-4.15mm, a smaller area S2 can be used to obtain a larger perimeter L, thereby improving the fitting stability of the protective patch 130 and the main body 122. In the present application, the shape of the main body 122 is a racetrack shape, and in other embodiments, the main body 122 can also be circular or elliptical or oval, and the shape of the protective patch 130 remains the same as that of the main body 122.

[0039] In the present application, the part of the protective patch 130 corresponding to the mounting hole 111 is provided with a pressure relief hole 131. By providing the pressure relief hole 131 on the protective patch 130, when the protective patch 130 is attached to the main body 122 and the top cover 110, the air between the protective patch 130 and the main body 122 can be discharged through the pressure relief hole 131, avoiding the problem that the air presses the protective patch 130 and causes the middle region of the protective patch 130 to bulge and not to be tightly attached to the main body 122, thereby improving the reliability of the fitting of the protective patch 130 and the main body 122.

[0040] Further, by cutting the middle position of the protective patch 130 to obtain a pressure relief hole 131 in the shape of a "cross", the position of the protective patch 130 provided with the pressure relief hole 131 will be deformed and opened under the condition of being pressed by air, so that the air can be discharged through the pressure relief hole 131, and after the protective patch 130 is well fitted with the main body 122 and the top cover 110, the position of the protective patch 130 provided with the pressure relief hole 131 is deformed to recover and the pressure relief hole 131 is closed, so that the protective patch 130 can play a better protective role on the explosion-proof valve 120 and avoid the pollution of the explosion-proof valve 120.

[0041] As shown in Figure 3 In the present application, the outer surface 113 of the top cover 110 is provided with a mounting groove 114, the mounting groove 114 has a bottom surface 115 and a side peripheral surface 116 connected to the edge of the bottom surface 115, and the mounting hole 111 is located on the bottom surface 115. The protective patch 130 has an upper surface 132 and a lower surface 133 opposite to the upper surface 132, the protective patch 130 is accommodated in the mounting groove 114, and the lower surface 133 is tightly attached to the bottom surface 115 and the main body 122.

[0042] It can be understood that the hole diameter of the mounting groove 114 is larger than the hole diameter of the mounting hole 111, and the mounting hole 111 is located on the bottom surface 115 of the mounting groove 114, so that the mounting groove 114 and the mounting hole 111 integrally constitute a two-section stepped hole. The mounting groove 114 can provide a mounting position for the protective patch 130, thereby providing a reference position for the installation of the protective patch 130 to ensure that the protective patch 130 can completely cover the mounting hole 111.

[0043] Further, the protective patch 130 has an outer peripheral surface 134 connected between the upper surface 132 and the lower surface 133, and the outer peripheral surface 134 abuts against the side peripheral surface 116. It can be understood that the protective patch 130 has the same shape and the same area size as the mounting groove 114, so that the protective patch 130 can be placed in the mounting groove 114, and the outer peripheral surface 134 of the protective patch 130 can abut against the side peripheral surface 116 of the mounting groove 114. In this way, the fitting area of the protective patch 130 and the mounting groove 114 can be increased, and the fitting stability and reliability of the protective patch 130 and the top cover 110 can be improved.

[0044] In the present application, the upper surface 132 of the protective patch 130 is flush with the outer surface 113 of the top cover 110. In this way, the fitting stability and reliability of the protective patch 130 and the top cover 110 can be improved, and the possibility of the protective patch 130 separating from the top cover 110 can be reduced.

[0045] Specifically, in the present application, the main body portion 122 includes an explosion portion 123 and a fitting portion 124 arranged around the explosion portion 123, and the fitting portion 124 is higher than the side of the explosion portion 123 facing the protective patch 130. The fitting portion 124 abuts against the lower surface 133, and the explosion portion 123 is arranged in a spaced manner with the lower surface 133. It can be understood that the fitting portion 124 is the part of the main body portion 122 abutting against the protective patch 130, and the explosion portion 123 is the part of the main body portion 122 capable of deforming to generate an explosion hole under the action of gas pressure. It can be understood that the annular plane of the fitting portion 124 abutting against the protective patch 130 is flush with the bottom surface 115 of the mounting groove 114, so that the lower surface 133 of the protective patch 130 can be better fitted with the bottom surface 115 of the mounting groove 114 and the fitting portion 124.

[0046] By making the fitting portion 124 higher than the explosion portion 123, the fitting portion 124 can support the protective patch 130 while abutting against the protective patch 130, so as to ensure the spacing between the protective patch 130 and the explosion portion 123, thereby providing a space for the slight deformation of the explosion portion 123, avoiding the explosion portion 123 abutting against the protective patch 130 without generating an explosion hole, and further avoiding the problem of the protective patch 130 not being firmly fitted with the top cover 110 and the fitting portion 124.

[0047] Further, the side of the blasting portion 123 facing the lower surface 133 is provided with a groove 123c extending in a long strip shape on the surface of the blasting portion 123. By providing the groove 123c on the surface of the blasting portion 123, the thickness of the local position of the blasting portion 123 can be reduced, thereby reducing the difficulty of the blasting portion 123 deforming to form a blasting hole.

[0048] Further, the groove 123c includes a first groove 123a and a second groove 123b. The second groove 123b is close to the edge of the blasting portion 123 and extends in an open ring shape along the edge of the blasting portion 123. The first groove 123a is located within the ring-shaped range surrounded by the second groove 123b and extends in a "Y" shape. It can be understood that the first groove 123a in the "Y" shape and the second groove 123b in the substantially ring shape can extend to a larger area on the blasting portion 123, thereby helping to form a larger blasting hole, facilitating the rapid discharge of the gas in the battery cell 100 through the blasting hole. In this application, the first groove 123a and the second groove 123b are in communication. In other embodiments, only the first groove 123a or only the second groove 123b can be provided, and the shape of the first groove 123a and the second groove 123b can also be changed.

[0049] The application also protects a battery pack including the battery cell 100 described above. The battery pack can also include a shell, and the number of battery cells 100 can be multiple. The multiple battery cells 100 are accommodated in the internal space of the shell and are arranged in an array to cooperate to supply power. In the battery pack, the protective patch 130 in the battery cell 100 can provide more reliable protection for the explosion-proof valve 120, reducing the risk of the explosion-proof valve 120 being contaminated, thereby improving the safety factor of the battery pack.

[0050] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric cell, characterized by, The application relates to an explosion-proof valve, which comprises a top cover, an explosion-proof valve body and a protective patch. The top cover is provided with a mounting hole. The explosion-proof valve body is connected with the top cover and is partially inserted into the mounting hole. The protective patch is larger than the mounting hole and can completely cover the mounting hole. The area of the projection of the protective patch on a plane perpendicular to the center axis of the mounting hole is S1, the area of the projection of the explosion-proof valve body on the plane is S2, and S1 / S2=i, wherein 1 2. The electric cell of claim 1, wherein, The perimeter of the projection of the explosion-proof valve body on the plane is L, and S2 / L=a, wherein 2.97mm 3. The electric cell of claim 2, wherein, The part of the protective patch corresponding to the mounting hole is provided with a pressure relief hole.

4. The electric cell of claim 1, wherein, The top cover is provided with an inner surface and an outer surface, and the mounting hole penetrates the inner surface and the outer surface.

5. The cell of any one of claims 1 to 4, wherein, The connecting part is connected with the inner surface, and the explosion-proof valve body is matched with the shape of the mounting hole.

6. The electric cell of claim 5, wherein, The outer surface is provided with a mounting groove, and the mounting hole is located on the bottom surface of the mounting groove.

7. The electric cell of claim 6, wherein, The protective patch is provided with an upper surface and a lower surface opposite to the upper surface.

8. The electric cell of claim 6, wherein, The protective patch is accommodated in the mounting groove, and the lower surface is tightly attached to the bottom surface and the explosion-proof valve body.

9. The electric cell of claim 8, wherein, The protective patch is provided with an outer peripheral surface connected between the upper surface and the lower surface, and the outer peripheral surface is tightly attached to the side peripheral surface.

10. The electric cell of claim 9, wherein, The explosion-proof valve body comprises an explosion part and a fitting part arranged around the explosion part.

11. A battery pack, characterized by The side of the explosion part facing the lower surface is provided with a groove. The groove extends in a strip shape on the surface of the explosion part. The groove comprises a first groove and a second groove. The second groove is located at the edge of the explosion part and extends in an open ring shape along the edge of the explosion part. The first groove is located in the ring range surrounded by the second groove and extends in a "Y" shape. The application also relates to a battery cell comprising the explosion-proof valve.

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