Battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cover plate and a battery. The battery comprises a battery cover plate, the battery cover plate comprises a cover plate body, a sealing nail and a sealing piece, the cover plate body is provided with a containing hole and a liquid injection hole, the containing hole is communicated with the liquid injection hole, the containing hole and the liquid injection hole jointly penetrate through the cover plate body, the sealing nail is embedded in the liquid injection hole, and the containing hole is filled with structural adhesive; and the sealing piece is plugged at the hole opening of the accommodating hole and is fixed in the accommodating hole through the structural adhesive. According to the battery cover plate, the liquid injection hole is sealed through the structure, so that a welding process is omitted, the mounting difficulty is reduced, the problem of thermal damage caused by laser welding energy is avoided, and the equipment cost and the product loss are reduced while the sealing performance is met.

Description

Technical Field

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

[0002] During the battery production process, after the battery is filled, the filling hole on the battery cover needs to be sealed to isolate the inside of the battery cell from the external environment, avoiding a series of safety hazards such as leakage, corrosion, poor appearance, etc. during subsequent use of the battery cell.

[0003] In the prior art, a sealing aluminum nail is usually used to seal the injection hole. After the sealing aluminum nail is inserted into the injection hole, the sealing nail is welded in the injection hole through a laser welding process to achieve the sealing of the injection hole. However, the sealing aluminum nail is small in size, light in weight, difficult to install and position, and a slight position change will cause subsequent poor welding; and when the laser welding energy input is unstable, metal splashing, welding blasting, etc. will cause thermal damage around the injection hole, and in severe cases, holes will be generated, directly causing sealing failure; in addition, laser welding equipment is expensive, has a long maintenance cycle, and is difficult.

[0004] Therefore, there is an urgent need to provide a battery cover and a battery to solve the above problems. Utility Model Content

[0005] One purpose of the utility model is to provide a battery cover plate, which can avoid welding process, reduce installation difficulty, reduce equipment cost and reduce product loss while meeting the sealing performance.

[0006] Another object of the utility model is to provide a battery, which, by providing the above-mentioned battery cover, can reduce equipment costs and product losses while meeting the sealing performance.

[0007] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0008] Battery cover, including:

[0009] A cover plate body, wherein the cover plate body is provided with a receiving hole and a liquid injection hole, the receiving hole is connected with the liquid injection hole and passes through the cover plate body together with the liquid injection hole, a sealing nail is embedded in the liquid injection hole, and the receiving hole is filled with structural adhesive;

[0010] A sealing sheet is sealed at the opening of the receiving hole, and the sealing sheet is fixed in the receiving hole by the structural adhesive.

[0011] As an optional solution, the accommodating hole is coaxially arranged with the injection hole, and the radial dimension of the accommodating hole is larger than the radial dimension of the injection hole, so as to form a step surface at the connection between the accommodating hole and the injection hole.

[0012] As an optional solution, the diameter of the receiving hole is 2.5 to 3 times the diameter of the injection hole.

[0013] As an optional solution, the depth of the injection hole is 1.8 to 2.5 times the depth of the receiving hole.

[0014] As an optional solution, the circumferential side wall of the accommodating hole is an inclined surface, and in a direction along the axial direction of the accommodating hole and gradually away from the injection hole, the inclined surface is inclined in a direction away from the axis of the accommodating hole.

[0015] As an optional solution, one end of the sealing pin close to the accommodating hole is lower than the bottom of the accommodating hole.

[0016] As an optional solution, the space in the injection hole and between the sealing pin and the bottom of the receiving hole is defined as a reserved hole, and the depth of the reserved hole is 0.1 to 0.2 times the depth of the injection hole.

[0017] As an optional solution, there is a gap between the peripheral side of the sealing sheet and the side wall of the accommodating hole, and the gap is filled with the structural adhesive.

[0018] As an optional solution, the surface of the sealing sheet in contact with the structural adhesive is configured to be concave-convex.

[0019] A battery comprises a shell, a battery cell and the above-mentioned battery cover plate, wherein the battery cell is accommodated in the shell, and the battery cover plate is covered on the shell.

[0020] The beneficial effects of the utility model are:

[0021] The battery cover provided by the utility model, when sealing the injection hole, firstly drives the sealing nail into the injection hole, so that the sealing nail is stuck in the injection hole, and the surface of the sealing nail is tightly connected with the edge of the injection hole, forming the first level of sealing of the injection hole; then injects the structural glue into the receiving hole, and after the structural glue is solidified, forms the second level of sealing of the injection hole, thereby improving the sealing performance; finally, the sealing sheet is sealed at the opening of the receiving hole and the structural glue is pressed down, so that the structural glue is squeezed and diffused, and at the same time, the sealing sheet is fixed in the receiving hole by the structural glue, and the surface hardness of the sealing sheet is high after the sealing, which reduces scratches, bulges or depressions after the structural glue solidifies, and other poor appearance phenomena. The above structure is used to seal the injection hole, eliminating the welding process, reducing the difficulty of installation, avoiding the problem of thermal damage caused by laser welding energy, and reducing equipment costs and product losses while meeting the sealing performance.

[0022] The battery provided by the utility model, by providing the battery cover plate, can reduce equipment cost and product loss while meeting the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to explain the embodiments of the utility model or the technical solutions in the prior art more clearly and easily, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a top view of a battery cover provided by an embodiment of the utility model;

[0025] Figure 2 is a cross-sectional view of a battery cover provided by an embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the cooperation between the cover plate body and the sealing nail provided in the embodiment of the utility model.

[0027] In the figure:

[0028] 10. Cover plate body; 11. Receiving hole; 111. Step surface; 112. Inclined surface; 12. Liquid injection hole; 121. Reserved hole; 20. Sealing nail; 30. Structural adhesive; 40. Sealing sheet. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] like Figures 1 to 3 As shown, this embodiment provides a battery cover, which includes a cover body 10, a sealing pin 20 and a sealing sheet 40. The cover body 10 is provided with a receiving hole 11 and a liquid injection hole 12. The receiving hole 11 is arranged around the liquid injection hole 12 and is connected to the liquid injection hole 12. The receiving hole 11 and the liquid injection hole 12 pass through the cover body 10 together. The electrolyte can be injected into the battery through the liquid injection hole 12, and the liquid injection hole 12 is sealed through the receiving hole 11 after the liquid injection is completed. Among them, in order to achieve sealing, a sealing pin 20 is embedded in the liquid injection hole 12, and the receiving hole 11 is filled with a structural adhesive 30. The size of the sealing pin 20 matches the liquid injection hole 12, so that the sealing pin 20 can be stuck in the liquid injection hole 12. The sealing sheet 40 is blocked at the opening of the receiving hole 11 and pressed on the structural adhesive 30. The sealing sheet 40 is fixed in the receiving hole 11 through the structural adhesive 30, so that the receiving hole 11 is sealed by the sealing sheet 40.

[0034] When sealing the injection hole 12, first, the sealing pin 20 is driven into the injection hole 12, so that the sealing pin 20 is stuck in the injection hole 12, and the circumferential surface of the sealing pin 20 is closely matched with the hole wall of the injection hole 12 to form the first level of sealing of the injection hole 12; then, the structural adhesive 30 is injected into the receiving hole 11, and after the structural adhesive 30 is solidified, the second level of sealing of the injection hole 12 is formed, which improves the sealing performance; finally, the sealing sheet 40 is sealed at the opening of the receiving hole 11 and the structural adhesive 30 is pressed down, so that the structural adhesive 30 is squeezed and diffused, and the sealing sheet 40 is fixed in the receiving hole 11 through the structural adhesive 30. After the sealing sheet 40 is sealed, its surface hardness is high, which reduces scratches, bulges or depressions after the structural adhesive 30 solidifies, and other poor appearance phenomena. The above structure is used to seal the injection hole 12, eliminating the welding process, reducing the difficulty of installation, avoiding the problem of thermal damage caused by laser welding energy, and reducing equipment costs and product losses while meeting the sealing performance.

[0035] In an optional embodiment, the injection holes 12 are all round holes, and the sealing pin 20 is a cylinder. The size of the sealing pin 20 matches the injection hole 12, which means that the size of the sealing pin 20 is slightly larger than the size of the injection hole 12. The sealing pin 20 is a rubber pin, and the sealing pin 20 forms an interference fit relationship with the injection hole 12 through its own elastic deformation. When the sealing pin 20 seals the injection hole 12, the sealing pin 20 is driven into the injection hole 12 by force in an interference fit manner.

[0036] In an optional embodiment, if Figure 3 As shown, the receiving hole 11 and the injection hole 12 are coaxially arranged, and the radial dimension of the receiving hole 11 is larger than the radial dimension of the injection hole 12. Therefore, the receiving hole 11 and the injection hole 12 together constitute a stepped hole, and a step surface 111 is formed at the connection between the receiving hole 11 and the injection hole 12. The receiving hole 11 and the injection hole 12 are set in the form of stepped holes because the size of the injection hole 12 should not be too large. Under the condition of satisfying the injection, the injection hole 12 is too large, which may increase the risk of leakage. On this basis, if the receiving hole 11 and the injection hole 12 are set in the form of through-type straight holes, the sealing area will be too small, and the amount of glue injection cannot be guaranteed, so the sealing strength cannot be guaranteed. Therefore, by setting the receiving hole 11 and the injection hole 12 in the form of stepped holes, the risk of leakage can be reduced while the amount of glue injection can be guaranteed, thereby ensuring the sealing strength.

[0037] In an optional embodiment, if Figure 3As shown, the circumferential side wall of the receiving hole 11 is an inclined surface 112, and in the direction along the axial direction of the receiving hole 11 and gradually away from the injection hole 12, the inclined surface 112 is inclined in the direction away from the axis of the receiving hole 11, that is, the receiving hole 11 is an inverted truncated cone with the large end away from the injection hole 12. Compared with the receiving hole 11 being set as a cylinder, under the premise of the same depth, the surface area of ​​the inclined surface 112 relative to the vertical wall is larger, and the wetting and diffusion area of ​​the structural adhesive 30 is larger, so the sealing effect is better.

[0038] like Figure 3 As shown, the receiving hole 11 and the injection hole 12 are both coaxially arranged circular holes. In an optional embodiment, the diameter D of the receiving hole 11 is 2.5 to 3 times the diameter d of the injection hole 12. Exemplarily, the diameter D of the receiving hole 11 can be 2.5 times, 2.6 times, 2.7 times, 2.8 times, 2.9 times or 3 times the diameter d of the injection hole 12. By setting the diameter relationship between the receiving hole 11 and the injection hole 12 within the above range, under the premise that the size of the injection hole 12 is not too large, it can be ensured that the space size of the receiving hole 11 can meet the space requirements of the injection amount, thereby ensuring the sealing performance, while avoiding the diameter of the receiving hole 11 being too large to affect the structural strength of the cover body 10. It should be noted that when the receiving hole 11 is in the shape of an inverted truncated cone, the diameter D of the receiving hole 11 refers to its average diameter.

[0039] In an optional embodiment, if Figure 3 As shown, the depth h of the injection hole 12 is 1.8 to 2.5 times the depth H of the receiving hole 11. Exemplarily, the depth h of the injection hole 12 can be 1.8 times, 1.9 times, 2.0 times, 2.1 times, 2.2 times, 2.3 times, 2.4 times or 2.5 times the depth H of the receiving hole 11. By setting the depth relationship between the receiving hole 11 and the injection hole 12 within the above range, it can be ensured that the receiving hole 11 has enough space for glue injection to ensure sealing, while avoiding the excessive depth of the receiving hole 11 affecting the structural strength of the cover body 10.

[0040] In an optional embodiment, if Figure 2 and Figure 3 As shown, the end of the sealing pin 20 close to the receiving hole 11 is lower than the bottom of the receiving hole 11, so that a reserved hole 121 is formed in the injection hole 12 and in the space between the sealing pin 20 and the bottom of the receiving hole 11. In other words, the upper end surface of the sealing pin 20 is not flush with the step surface 111, and there is a certain height difference between the two, so that the reserved hole 121 is formed at the top of the injection hole 12. After the sealing pin 20 is driven into the injection hole 12, a position for the reserved hole 121 is reserved in the injection hole 12, so that during the subsequent glue injection, part of the structural glue 30 will also be filled in the reserved hole 121, so that the sealing effect is better.

[0041] In an optional embodiment, if Figure 3 As shown, the depth l of the reserved hole 121 is 0.1 to 0.2 times the depth h of the injection hole 12. Exemplarily, the depth l of the reserved hole 121 can be 0.1 times, 0.15 times or 0.2 times the depth h of the injection hole 12. By setting the depth relationship between the reserved hole 121 and the injection hole 12 within the above range, it can be ensured that a portion of the structural adhesive 30 can be filled in the injection hole 12 to improve the sealing performance, while avoiding the depth of the reserved hole 121 being too large to increase the difficulty of installing the sealing nail 20.

[0042] Optionally, the structural adhesive 30 can be filled into the receiving hole 11 using one of structural adhesives such as epoxy resin adhesive, polyurethane structural adhesive, cyanoacrylate resin adhesive or acrylate structural adhesive to seal the injection hole 12 .

[0043] It is worth noting that when injecting glue into the receiving hole 11, a glue dispensing nozzle is used to pour glue from the inside to the outside in a circle along a spiral track starting from the center of the sealing pin 20. The spiral track is similar to the shape of a mosquito coil, and finally solidifies to form a structural glue 30. This pouring method can make the glue liquid dispersed and filled in the receiving hole 11 faster and more uniform, saving time and improving the efficiency of glue injection.

[0044] In an optional embodiment, if Figure 2 As shown, there is a gap between the peripheral side of the sealing sheet 40 and the side wall of the receiving hole 11, and the gap is also filled with structural adhesive 30. It should be noted that the gap cannot be too large, otherwise it will affect the positioning and installation of the sealing sheet 40. In actual production, the gap between the sealing sheet 40 and the receiving hole 11 must be guaranteed to be less than 0.1 mm.

[0045] It is understandable that when injecting glue, the system is set to fill the entire receiving hole 11 with glue when the glue dispensing nozzle is applied along a spiral trajectory. However, in actual operation, due to some influencing factors, such as some glue may stick to the glue dispensing nozzle, the glue in the receiving hole 11 may not be fully filled. Therefore, after injecting glue, a sealing sheet 40 is directly pressed down on the structural glue 30. When the upper surface of the sealing sheet 40 is flush with the upper surface of the cover body 10, the structural glue 30 is just squeezed and spread, thereby filling the gap between the sealing sheet 40 and the receiving hole 11. After the structural glue 30 solidifies, the fixing and sealing process of the sealing sheet 40 is completed. Therefore, the sealing sheet 40 is directly fixed in the receiving hole 11 by the structural glue 30, and no welding process is required.

[0046] By adding a sealing sheet 40 to the structural adhesive 30, the surface hardness of the sealing sheet 40 after sealing is high, reducing scratches, bulges or depressions after the structural adhesive 30 solidifies, and other poor appearance phenomena. Secondly, the sealing sheet 40 squeezes the structural adhesive 30, so that the structural adhesive 30 has an additional diffusion channel, which diffuses into the receiving hole 11 on the one hand and diffuses to the sealing sheet 40 on the other hand, so that the structural adhesive 30 is compacted and has higher strength.

[0047] In an optional embodiment, if Figure 2 As shown, the surface of the sealing sheet 40 for contacting the structural adhesive 30 is set to be concave-convex, such as wavy, zigzag or other irregular concave-convex shapes. This setting can increase the surface area of ​​the sealing sheet 40, thereby increasing the contact area between the sealing sheet 40 and the structural adhesive 30, which is more conducive to the diffusion of the structural adhesive 30.

[0048] The cover body 10 is a plain aluminum plate, and the sealing sheet 40 is made of metal, preferably aluminum, which has high structural strength and is wear-resistant. It should be noted that the battery cover includes not only the cover body 10 and the sealing sheet 40 mentioned above, but also a pole, an explosion-proof valve, a lower plastic plate and other structures. The other structures of the battery cover belong to the prior art and will not be described here.

[0049] Combination Figure 2 In this embodiment, the sealing process of the injection hole 12 is as follows:

[0050] 1) After the injection is completed through the injection hole 12, the injection hole 12 is wiped with DMC using a non-woven fabric or a cotton swab to remove residual electrolyte, and then the sealing nail 20 is driven into the injection hole 12 to form a first-level seal for the injection hole 12. After that, the receiving hole 11 and the injection hole 12 are cleaned by laser, which removes pollutants and increases the roughness of the surface of the receiving hole 11 to a certain extent, which helps to release the surface tension of the glue and facilitates the diffusion of the structural adhesive 30 on the surface of the receiving hole 11;

[0051] 2) Afterwards, the structural glue 30 is injected into the receiving hole 11 through the glue dispensing nozzle. When injecting glue, the center of the sealing pin 20 is used as the starting point, and the glue is poured from the inside to the outside in a circle along a spiral track, so that the glue flows in the injection hole 12 and basically fills the entire receiving hole 11, so as to achieve a second level of sealing of the injection hole 12;

[0052] 3) After the glue is injected, the sealing sheet 40 is pressed down on the structural glue 30. When the upper surface of the sealing sheet 40 is flush with the upper surface of the cover body 10, the structural glue 30 is just squeezed and spread, thereby filling the gap between the sealing sheet 40 and the receiving hole 11, and the sealing sheet 40 is fixed;

[0053] 4) Finally, check whether there is any overflowed colloid around the receiving hole 11. If there is any overflowed colloid, the battery is transferred to the storage station for manual glue removal, and the qualified products are continuously transported to the next step;

[0054] 5) Leave the battery to stand until the structural adhesive 30 is completely cured to complete the sealing of the battery.

[0055] This embodiment also provides a battery, including a shell, a battery cell and the above-mentioned battery cover, the battery cell is accommodated in the shell, and the battery cover sealing cover is arranged on the shell. The injection hole 12 on the cover body 10 is used to inject electrolyte into the battery so that the battery cell can be infiltrated by the electrolyte.

[0056] The battery in this embodiment adopts the above-mentioned battery cover, so that the battery can obtain better battery sealing, and can ensure the sealing quality of the liquid injection hole 12 on the battery cover. The first-level sealing of the liquid injection hole 12 is completed by the sealing nail 20, and the second-level sealing of the liquid injection hole 12 is completed by the structural glue 30 filled in the receiving hole 11, thereby improving the sealing of the battery, thereby extending the service life of the battery and improving the safety of the battery.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery cover, characterized in that: include: The cover plate body (10) is provided with a receiving hole (11) and a liquid injection hole (12), the receiving hole (11) is communicated with the liquid injection hole (12) and passes through the cover plate body (10) together with the liquid injection hole (12), a sealing nail (20) is embedded in the liquid injection hole (12), and the receiving hole (11) is filled with structural glue (30); A sealing sheet (40) is sealed at the opening of the receiving hole (11), and the sealing sheet (40) is fixed in the receiving hole (11) by means of the structural adhesive (30).

2. The battery cover according to claim 1, characterized in that: The receiving hole (11) is coaxially arranged with the injection hole (12), and the radial dimension of the receiving hole (11) is larger than the radial dimension of the injection hole (12), so as to form a step surface (111) at the connection between the receiving hole (11) and the injection hole (12).

3. The battery cover according to claim 2, characterized in that: The diameter of the receiving hole (11) is 2.5 to 3 times the diameter of the injection hole (12).

4. The battery cover according to any one of claims 1 to 3, characterized in that: The depth of the injection hole (12) is 1.8 to 2.5 times the depth of the receiving hole (11).

5. The battery cover according to any one of claims 1 to 3, characterized in that: The circumferential side wall of the receiving hole (11) is an inclined surface (112), and in a direction along the axial direction of the receiving hole (11) and gradually away from the injection hole (12), the inclined surface (112) is inclined in a direction away from the axis of the receiving hole (11).

6. The battery cover according to any one of claims 1 to 3, characterized in that: One end of the sealing pin (20) close to the receiving hole (11) is lower than the bottom of the receiving hole (11).

7. The battery cover according to claim 6, characterized in that: The space inside the injection hole (12) and between the sealing pin (20) and the bottom of the receiving hole (11) is defined as a reserved hole (121), and the depth of the reserved hole (121) is 0.1 to 0.2 times the depth of the injection hole (12).

8. The battery cover according to any one of claims 1 to 3, characterized in that: There is a gap between the peripheral side of the sealing sheet (40) and the side wall of the receiving hole (11), and the gap is filled with the structural adhesive (30).

9. The battery cover according to any one of claims 1 to 3, characterized in that: The surface of the sealing sheet (40) that is in contact with the structural adhesive (30) is configured to be concave-convex.

10. A battery, characterized in that The invention comprises a shell, a battery cell and a battery cover plate as claimed in any one of claims 1 to 9, wherein the battery cell is accommodated in the shell, and the battery cover plate is covered on the shell.

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