Battery sealing element and battery

Abstract

The utility model provides a battery sealing element and a battery, and the battery sealing element comprises a boss and a connecting sheet connected to the bottom of the outer side surface of the boss. The connecting piece comprises a top face, a first outer side face and a second outer side face, the first outer side face and the second outer side face are both connected to the outer side of the top face, meanwhile, the first outer side face is located between the top face and the second outer side face, the first outer side face is parallel to the central axis of the boss, and the second outer side face inclines towards the boss relative to the first outer side face. After the battery sealing element is welded, the connecting piece and the boss part connected with the connecting piece are naturally cooled, and the internal material is extruded towards the top of the boss, so that the thermal stress is released to prevent the battery sealing element from cracking. And meanwhile, the vertical structure of the first outer side surface of the connecting sheet enables the battery sealing element to be convenient to stamp and manufacture, and the first outer side surface and the second outer side surface jointly form a structure similar to a cone, so that the battery sealing element is convenient to position when being mounted in the liquid injection hole, and is convenient to mount.

Description

Technical Field

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

[0002] In the related art, most batteries often weld a seal to the liquid injection hole of the top cover to seal the liquid injection hole. However, the seal is affected by thermal stress during the welding process. When industrial parameters or the external environment change during the welding process, the thermal stress on the seal is aggravated, causing cracks in the weld between the seal and the top cover, and ultimately weakening the seal between the seal and the liquid injection hole. Utility Model Content

[0003] The embodiments of the present utility model provide a battery seal and a battery, which can solve the problem that the seal is affected by thermal stress during welding, resulting in cracks at the weld between the seal and the top cover.

[0004] In a first aspect, an embodiment of the present utility model provides a battery seal, comprising:

[0005] A battery seal, comprising:

[0006] bosses; and

[0007] A connecting piece connected to the bottom of the outer side surface of the boss;

[0008] Among them, the connecting piece includes a top surface, a first outer side surface and a second outer side surface, the first outer side surface and the second outer side surface are connected to the outer side of the top surface, and the first outer side surface is connected between the top surface and the second outer side surface; the first outer side surface is parallel to the central axis of the boss, and the second outer side surface is inclined toward the boss relative to the first outer side surface.

[0009] In one embodiment, H1≤0.2 mm; wherein H1 is the height of the first outer side surface.

[0010] In one embodiment, the boss includes a main body and a connecting portion surrounding the outside of the main body, and the connecting piece surrounds the outer side of the connecting portion; wherein the main body is recessed toward the bottom of the boss to form a groove portion, and the groove portion is provided with a groove.

[0011] In one embodiment, H2≤H, H3≤H, 0.4mm≤H≤1.2mm, 0.3mm≤H2≤1.0mm, 0.3mm≤H3≤1.0mm; wherein H2 is the thickness of the side wall of the groove portion, H3 is the thickness of the connecting portion, and H is the thickness of the connecting piece.

[0012] In one embodiment, the bottom surface of the groove portion is higher than the bottom surface of the connecting piece.

[0013] In one embodiment, the bottom surface of the groove portion is flush with the bottom surface of the connecting piece.

[0014] In one embodiment, the battery seal is used to seal the injection hole of the top cover, the injection hole includes a first hole and a second hole that are interconnected, the first hole is located above the second hole and the diameter of the first hole is larger than the diameter of the second hole, the connecting piece is welded to the hole wall of the first hole, and the thickness of the connecting piece is equal to the depth of the first hole.

[0015] In one embodiment, 0.6 mm ≤ D ≤ 1.3 mm; wherein D is the depth of the second hole.

[0016] In one embodiment, the outer side surface of the boss is inclined relative to the first outer side surface of the connecting piece.

[0017] In a second aspect, an embodiment of the present invention provides a battery, comprising the battery seal of the first aspect and a top cover, wherein the top cover is provided with a liquid injection hole, and the battery seal seals the liquid injection hole of the top cover.

[0018] The present invention provides a battery box and a battery pack, wherein the battery seal includes a boss and a connecting piece connected to the bottom of the outer side of the boss. The connecting piece includes a top surface, a first outer side surface and a second outer side surface, the first outer side surface and the second outer side surface are connected to the outer side of the top surface, and the first outer side surface is connected between the top surface and the second outer side surface, while the first outer side surface is parallel to the central axis of the boss, and the second outer side surface is equivalent to the first outer side surface being inclined toward the boss. In the battery seal provided by the present invention, the connecting piece will expand outward from the second outer side surface due to heat absorption during the welding process, and the inclined portion where the boss and the connecting piece are connected will also expand outward due to heat conduction. After the welding is completed, the connecting piece and the inclined portion of the boss cool naturally and shrink inward respectively. Because the boss and the connecting piece form a bending structure, the internal material of the connecting piece and the inclined portion of the boss will be squeezed toward the top of the boss when shrinking, thereby preventing the battery seal from cracking due to the inability to release stress due to structural shrinkage during cooling. At the same time, the first outer side surface and the second outer side surface together form a cone-like structure, which makes it easy to position the battery seal when it is installed in the liquid injection hole, making it easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic structural diagram of a battery seal provided by an embodiment of the present utility model;

[0021] Figure 2 yes Figure 1 A cross-sectional view of a battery seal installed in a liquid injection hole;

[0022] Figure 3 yes Figure 2 Enlarged view of part A;

[0023] Figure 4 yes Figure 3 Schematic diagram of the structure of the battery seal;

[0024] Figure 5 This is a schematic structural diagram of a battery seal provided by an embodiment of the present utility model;

[0025] Figure 6 yes Figure 5 sectional view of

[0026] Figure 7 This is a schematic structural diagram of a battery seal provided by an embodiment of the present utility model;

[0027] Figure 8 yes Figure 7 sectional view of

[0028] Description of reference numerals:

[0029] 100. Battery seal; 110. Boss; 111. Main body; 112. Connecting portion; 113. Groove portion; 114. Groove; 120. Connecting piece; 121. Top surface; 122. First outer side surface; 123. Second outer side surface; 200. Battery top cover; 210. Liquid injection hole; 211. First hole; 212. Second hole. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present utility model, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0031] During the heat absorption process of the seal while being welded to the battery cover, and the subsequent cooling process, different parts of the seal absorb heat and cool at different rates, i.e., temperature differences. This causes the seal to expand unevenly when absorbing heat and contract unevenly when cooling, generating thermal stress. This thermal stress can cause the seal structure to crack, thereby affecting the seal between the seal and the battery cover.

[0032] In order to solve the problem that the seal structure may be broken due to the influence of thermal stress during the welding process, the embodiment of the present invention provides a battery seal 100, please refer to Figures 1 to 4 , Figure 1 This is a schematic structural diagram of a battery seal 100 provided in an embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional view of the battery seal 100 installed in the liquid injection hole 210, Figure 3 yes Figure 2 The enlarged view of part A in the middle Figure 4 yes Figure 3 Schematic diagram of the structure of the battery seal 100. The battery seal 100 includes a boss 110 and a connecting piece 120 connected to the bottom of the outer side of the boss 110. The connecting piece 120 includes a top surface 121, a first outer side surface 122, and a second outer side surface 123. The first outer side surface 122 and the second outer side surface 123 are connected to the outside of the top surface 121, and the first outer side surface 122 is connected between the top surface 121 and the second outer side surface 123. At the same time, the first outer side surface 122 is parallel to the central axis of the boss 110, and the second outer side surface 123 is equivalent to the first outer side surface 122 being inclined toward the boss 110. In the battery seal 100 provided in this embodiment, the second outer side surface 123 of the connecting piece 120 abuts against the inner wall of the liquid injection hole 210 located on the battery top cover 200, and a gap exists between the first outer side surface 122 and the liquid injection hole 210. This gap is used to weld the connecting piece 120 to the battery top cover 200, so that the battery seal 100 composed of the connecting piece 120 and the boss 110 seals the liquid injection hole 210.

[0033] In this embodiment, the connecting piece 120 will expand outward from the second outer side surface 123 due to heat absorption during the welding process. At the same time, the inclined portion where the boss 110 and the connecting piece 120 are connected will also expand outward due to heat conduction. After the welding is completed, the connecting piece 120 and the inclined portion of the boss 110 will naturally cool down and shrink inward respectively. Because of the bending structure formed by the boss 110 and the connecting piece 120, the internal material of the connecting piece 120 and the inclined portion of the boss 110 will be squeezed toward the top of the boss 110 when they shrink, thereby preventing the battery seal 100 from cracking due to thermal stress. In addition, since the first outer side surface 122 is parallel to the central axis of the boss 110, the second outer side surface 123 is inclined toward the boss 110 relative to the first outer side surface 122, and the first outer side surface 122 is located between the top surface 121 and the second outer side surface 123, the vertical structure of the first outer side surface 122 makes it easy to stamp the battery seal 100, and the first outer side surface 122 and the second outer side surface 123 together form a cone-like structure, which makes it easy to position the battery seal 100 when installed in the injection hole 210, making it easy to install.

[0034] In some embodiments, please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic structural diagram of a battery seal 100 provided in an embodiment of the present invention. Figure 6 yes Figure 5 sectional view. Boss 110 includes a main body 111 and a connecting portion 112 surrounding the outside of main body 111. Connecting piece 120 surrounds the outer side of connecting portion 112. Main body 111 is recessed toward the bottom of boss 110 to form a groove 113. Groove 113 is provided with a groove 114.

[0035] Specifically, the main body 111 of the boss 110 in this embodiment is recessed toward the bottom of the boss 110, and a groove 114 is formed. The main body 111 of the boss 110 in this embodiment includes a bending structure composed of a convex portion and a groove portion 113. First, when the main body 111 is bent toward the bottom of the boss 110, the cross-sectional shape of the main body 111 changes, which usually leads to an increase in the moment of inertia of the cross section. The moment of inertia is a physical quantity that describes the ability of a cross section to resist bending deformation. The greater the moment of inertia, the more significant the effect of the cross section in resisting bending. Therefore, after the main body 111 is bent toward the bottom of the boss 110, its bending resistance will be enhanced due to the increase in the moment of inertia of the cross section. Secondly, the bending of the main body 111 can increase the bending stiffness of the structure, that is, under the same external force, the bent main body 111 will produce a smaller bending deformation, thereby increasing its overall structural stability and bearing capacity. At the same time, the concave curvature of the main body 111 toward the bottom of the boss 110 also redistributes the stress within the main body 111. Typically, the bent main body 111 generates higher stress in the bent area, but overall this may reduce or redistribute the areas of stress concentration, thereby enabling the battery seal 100 to distribute stress more evenly when bearing external loads, reducing the risk of structural damage caused by localized stress concentration. Therefore, the boss 110 structure in this embodiment has higher structural strength than a structure in which the main body 111 of the boss 110 is completely flat.

[0036] In some embodiments, please refer to Figure 5 , H1≤0.2mm, where H1 is the height of the first outer side surface 122.

[0037] Specifically, since the first outer side surface 122 in the battery seal 100 is parallel to the central axis of the boss 110, when the battery seal 100 is installed to the injection hole 210, there will be a certain gap between the first outer side surface 122 of the battery seal 100 and the inner wall of the injection hole 210, and this gap is used to weld the battery seal 100 and the battery top cover 200. It is easy to understand that if the height H1 of the first outer side surface 122 is larger, the volume of the gap will also be larger, and the larger the volume of the gap, the more difficult it is to weld the battery seal 100 and the battery top cover 200 together, which ultimately leads to a higher defective rate of the product obtained after welding. According to experimental data, when the height H1 of the first outer side surface 122 is designed to be less than or equal to 0.2 mm, the defective rate of the product obtained after welding the battery seal 100 and the battery top cover 200 is low.

[0038] In some embodiments, please refer to Figure 3The battery seal 100 is used to seal the liquid injection hole 210 of the battery top cover 200. The liquid injection hole 210 includes a first hole 211 and a second hole 212 that are interconnected. The first hole 211 is located above the second hole 212 and the diameter of the first hole 211 is larger than the diameter of the second hole 212. The connecting piece 120 is welded to the hole wall of the first hole 211, and the thickness of the connecting piece 120 is equal to the depth of the first hole 211.

[0039] Specifically, in this embodiment, the thickness of the connecting piece 120 is designed to be equal to the depth of the first hole 211. This design is intended to ensure the structural orientation and sealing of the battery seal 100 when it is installed on the injection hole 210 and welded. If there is a significant difference between the thickness of the connecting piece 120 and the depth of the first hole 211, the structural strength of the battery seal 100 may be insufficient after welding, which will increase the risk of damage to the weld between the battery seal 100 and the battery top cover. Specifically, if the thickness of the connecting piece 120 does not match the depth of the first hole 211, insufficient structural tightness or local stress concentration may occur during the welding process, thereby reducing the reliability and stability of the weld. In this embodiment, by designing the thickness of the connecting piece 120 to be equal to the depth of the first hole 211, it is possible to effectively reduce the structural defects and poor sealing performance of the battery seal 100 that may occur during the welding process. This design not only helps to improve the strength and durability of the weld, but also ensures that the sealing between the battery seal 100 and the injection hole 210 meets the requirements.

[0040] In some embodiments, please refer to Figure 3 , H2≤H, H3≤H, 0.4mm≤H≤1.2mm, 0.3mm≤H2≤1.0mm, 0.3mm≤H3≤1.0mm, wherein H2 is the thickness of the side wall of the groove portion 113 , H3 is the thickness of the connecting portion 112 , and H is the thickness of the connecting piece 120 .

[0041] Specifically, the depth of the first hole 211 is generally designed to be 0.4 mm to 1.2 mm. To prevent the height difference between the connecting piece 120 and the first hole 211 from being too large, resulting in structural instability after welding, the thickness H of the connecting piece 120 needs to be designed to be equal to the depth of the first hole 211. Since the groove portion 113 is formed by stretching and extending the battery seal 100, the thickness H2 of the side wall of the groove portion 113 and the thickness H3 of the connecting portion 112 are thinner than the thickness H of the connecting piece 120. At the same time, to ensure the structural strength of the thickness H2 of the side wall of the groove portion 113 and the thickness H3 of the connecting portion 112, experimental data is available, and the thickness H2 of the side wall of the groove portion 113 and the thickness H3 of the connecting portion 112 are designed to be between 0.3 mm and 1.0 mm. At this time, the structural strength of the thickness H2 of the side wall of the groove portion 113 and the thickness H3 of the connecting portion 112 meet the requirements for stress release.

[0042] In some embodiments, please refer to Figure 3 , 0.6mm≤D≤1.3mm, where D is the depth of the second hole 212.

[0043] Specifically, the injection hole 210 is formed by stamping the top of the battery cover 200. During the production process, an injection device is pressed down on the injection hole 210 to inject electrolyte. To ensure that the electrolyte does not leak from the gap between the injection device and the injection hole 210 during the injection process, the injection device is usually set to have a strong downward pressure when pressing down. Therefore, the depth D of the second hole 212 needs to be designed to be deep enough to ensure that the structural strength of the injection hole 210 of the battery cover is sufficient to support the downward pressure of the injection device without being damaged. At the same time, to facilitate the stamping of the injection hole 210, the depth D of the second hole 212 cannot be too shallow. According to experimental data, when the depth D of the second hole 212 is between 0.6mm and 1.3mm, the structural strength of the injection hole 210 of the battery cover is strong, and it can withstand the downward pressure generated by the injection device without being damaged. At the same time, the injection hole 210 under this condition is also easy to stamp and form.

[0044] In some embodiments, the outer side surface of the boss 110 is inclined relative to the first outer side surface 122 of the connecting piece 120 .

[0045] Specifically, the outer side surface of the boss 110 is inclined toward the connecting piece 120 relative to the first outer side surface 122 of the connecting piece 120. Since the first outer side surface 122 of the connecting piece 120 is parallel to the central axis of the boss 110, the outer side surface of the boss 110 is inclined toward the connecting piece 120 relative to the vertical plane. During the production process, if the outer side surface of the battery seal 100 is parallel to the vertical plane or inclined inward relative to the vertical plane, it will produce a larger contact area with the side wall of the production mold, which will cause the battery seal 100 to be subjected to greater friction during the demolding process, making it difficult for the battery seal 100 to be smoothly moved out of the production mold. In this embodiment, the inclined outer side surface of the boss 110 reduces the resistance generated by the contact between the side and the mold when the mold is opened and closed, so that the battery seal 100 can be relatively easily separated from the mold.

[0046] In some embodiments, the bottom surface of the groove portion 113 is higher than the bottom surface of the connecting piece 120 .

[0047] Specifically, the main body 111 of the battery seal 100 is recessed toward the bottom of the boss 110 to form a groove 113, and the groove 113 is provided with a groove 114. At the same time, the bottom surface of the groove 113 is higher than the bottom surface of the connecting piece 120, so that a certain space exists between the bottom surface of the groove 114 and the second hole 212 of the liquid injection hole 210. This gap can accommodate additional components such as a sealing ring, which helps to enhance the sealing effect between the battery seal 100 and the liquid injection hole 210. The structure of the battery seal 100 provided in this embodiment can not only ensure the reliability of the seal, but also realize other additional functions, such as improving the durability of the battery seal 100 or preventing electrolyte leakage.

[0048] In some embodiments, please refer to Figure 3 、 Figure 7 as well as Figure 8 , Figure 7 This is a schematic structural diagram of a battery seal 100 provided in an embodiment of the present invention. Figure 8 yes Figure 7 The bottom surface of the groove portion 113 is flush with the bottom surface of the connecting piece 120.

[0049] Specifically, the main body 111 is recessed toward the bottom of the boss 110 until the bottom of the recessed portion 113 is flush with the bottom of the connecting piece 120. Compared to a battery seal 100 in which the main body 111 is not recessed toward the bottom of the boss 110 or the bottom of the recessed portion 113 is higher than the bottom of the connecting piece 120, the bottom of the recessed portion 113 of the battery seal 100 in this embodiment abuts against the bottom wall of the first hole 211. When an injection device is pressed down against the injection hole 210 to inject electrolyte, the downward pressure exerted by the injection device on the battery seal 100 is relatively large. The bottom wall of the first hole 211 can support the bottom of the recessed portion 113, thereby protecting the battery seal 100 to a certain extent and preventing damage to the battery seal 100 caused by excessive downward pressure exerted by the injection device.

[0050] In some embodiments, the structure of the boss 110 can be annular, circular, or other shapes.

[0051] The present invention provides a battery seal 100, which includes a boss 110 and a connecting piece 120 connected to the bottom of the outer side of the boss 110. The connecting piece 120 includes a top surface 121, a first outer side surface 122, and a second outer side surface 123. The first outer side surface 122 and the second outer side surface 123 are connected to the outer side of the top surface 121, and the first outer side surface 122 is connected between the top surface 121 and the second outer side surface 123. At the same time, the first outer side surface 122 is parallel to the central axis of the boss 110, and the second outer side surface 123 is inclined toward the boss 110, which is equivalent to the first outer side surface 122. In the battery seal 100 provided by the present invention, the connecting piece 120 will expand outward from the second outer side surface 123 due to heat absorption during the welding process. At the same time, the inclined portion where the boss 110 and the connecting piece 120 are connected will also expand outward due to heat conduction. After the welding is completed, the connecting piece 120 and the inclined portion of the boss 110 cool naturally and shrink inward respectively. Because the boss 110 and the connecting piece 120 form a bending structure, the internal material of the inclined portion of the connecting piece 120 and the boss 110 will be squeezed toward the top of the boss 110 when shrinking, thereby preventing the battery seal 100 from cracking due to the inability to release stress due to structural shrinkage during cooling. At the same time, the first outer side surface 122 and the second outer side surface 123 together form a cone-like structure, which makes it easy to position the battery seal 100 when it is installed in the injection hole 210, making it easy to install.

[0052] The present invention also provides a battery pack comprising the battery seal 100 and a top cover, wherein the top cover is provided with a liquid injection hole, and the battery seal seals the liquid injection hole of the top cover. The battery pack has all the advantages of the battery seal 100, which will not be further described here.

[0053] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery seal, characterized in that: include: boss; as well as a connecting piece connected to the bottom of the outer side surface of the boss; In which, the connecting piece includes a top surface, a first outer side surface and a second outer side surface, the first outer side surface and the second outer side surface are connected to the outer side of the top surface, and the first outer side surface is connected between the top surface and the second outer side surface; the first outer side surface is parallel to the central axis of the boss, and the second outer side surface is inclined toward the boss relative to the first outer side surface.

2. The battery seal according to claim 1, wherein H1≤0.2mm; wherein H1 is the height of the first outer side surface.

3. The battery seal according to claim 1, wherein The boss includes a main body and a connecting portion surrounding the outside of the main body, and the connecting piece surrounds the outer side of the connecting portion; wherein the main body is recessed toward the bottom of the boss to form a groove portion, and the groove portion is provided with a groove.

4. The battery seal according to claim 3, wherein: H2≤H, H3≤H, 0.4mm≤H≤1.2mm, 0.3mm≤H2≤1.0mm, 0.3mm≤H3≤1.0mm; wherein, H2 is the thickness of the side wall of the groove portion, H3 is the thickness of the connecting portion, and H is the thickness of the connecting piece.

5. The battery seal according to claim 3, wherein The bottom surface of the groove portion is higher than the bottom surface of the connecting piece.

6. The battery seal according to claim 3, wherein The bottom surface of the groove portion is flush with the bottom surface of the connecting piece.

7. The battery seal according to any one of claims 1 to 5, characterized in that: The battery seal is used to seal the injection hole of the top cover. The injection hole includes a first hole and a second hole that are interconnected. The first hole is located above the second hole and the diameter of the first hole is larger than the diameter of the second hole. The connecting piece is welded to the hole wall of the first hole, and the thickness of the connecting piece is equal to the depth of the first hole.

8. The battery seal according to claim 7, wherein: 0.6mm≤D≤1.3mm; wherein D is the depth of the second hole.

9. The battery seal according to claim 7 or 8, characterized in that The outer side surface of the boss is inclined relative to the first outer side surface of the connecting piece.

10. A battery, characterized in that: The battery seal comprises the battery seal according to any one of claims 1 to 9 and a top cover, wherein the top cover is provided with a liquid injection hole, and the battery seal seals the liquid injection hole of the top cover.

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