Cover plate assembly, single battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate assembly, a single battery and electric equipment. A liquid injection hole is formed in a cover plate body of the cover plate assembly, a stamping groove is formed in the bottom of the cover plate body and surrounds a bottom port of the liquid injection hole, a liquid injection groove is formed in the top of the cover plate body and surrounds a top port of the liquid injection hole in a stamping mode, and a sealing nail is inserted into the liquid injection groove in a matched mode. The sealing nail is connected with the liquid injection groove in a welded mode. The cover plate assembly can ensure that the roundness and the precision of the machined liquid injection groove meet the requirements, so that when the sealing nail and the liquid injection groove are installed in a matched mode, matching can be tighter, the follow-up welding quality is improved, and the sealing effect of the sealing nail on the liquid injection hole and the liquid injection groove is guaranteed.

Description

Technical Field

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

[0002] New energy battery covers are sheet materials used to cover new energy batteries, typically serving as a cover component to encase and protect them. They can be used with a variety of new energy battery types, including lithium batteries, lithium cobalt oxide batteries, and nickel-metal hydride batteries. New energy battery covers typically require a certain level of strength and wear resistance to protect the battery's internal structure from external environmental impacts and collisions. They also require a certain level of thermal conductivity to aid heat dissipation. With the rapid development of new energy vehicles, new energy battery covers are undergoing continuous improvement and innovation to meet evolving needs.

[0003] The structure of the lithium battery top cover is complex and precise, and it is responsible for energy transmission and explosion-proof pressure relief. The production cost is about twice that of the shell. The lithium battery cover is composed of more than 10 components, mainly composed of the cover, positive and negative poles, injection holes, explosion-proof valves and other structures, and the structure is precise and complex. Among them, the function of the injection hole is to inject electrolyte into the interior of the battery, and then use laser welding to seal the injection port with a sealing pin. In the process of inserting the sealing pin, the sealing pin and the inner wall of the injection hole produce an interference fit, and the injection hole can be tightly attracted to the surface of the sealing pin to form a complete seal. In the existing battery cover, the injection hole is often processed by a stamping manufacturing process, which results in the injection hole being not full enough and the roundness is poor, which is not conducive to the welding of the injection hole and the sealing pin, and is prone to leakage risk.

[0004] Therefore, there is an urgent need to provide a new type of cover plate assembly, single battery and electrical equipment to solve the above technical problems in the prior art. Utility Model Content

[0005] The purpose of the utility model is to provide a cover plate assembly, which can improve the accuracy of liquid injection hole processing, ensure that the roundness of the liquid injection hole meets the requirements, and improve the installation and matching effect and welding fixing effect of the liquid injection hole and the sealing pin.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The cover plate assembly includes a cover plate body, the cover plate body is provided with a liquid injection hole, the bottom of the cover plate body and surrounding the bottom port of the liquid injection hole are provided with a stamped groove, the top of the cover plate body and surrounding the top port of the liquid injection hole are stamped with a liquid injection groove, a sealing pin is inserted in the liquid injection groove, and the sealing pin is welded to the liquid injection groove.

[0008] Optionally, a limiting protrusion is provided at the bottom of the cover body and around the bottom port of the liquid injection hole, the liquid injection hole passes through the limiting protrusion, and the stamping groove is provided around the limiting protrusion.

[0009] Optionally, the above-mentioned limiting protrusion includes a connecting portion and a platform portion, the above-mentioned connecting portion is arranged in an annular outer wall of the above-mentioned platform portion, the bottom wall of the above-mentioned platform portion is arranged parallel to the bottom wall of the above-mentioned cover plate body, and the circumferential outer wall of the above-mentioned connecting portion is an inclined connecting slope, so that the outer diameter of the above-mentioned limiting protrusion gradually decreases from top to bottom, and at least part of the above-mentioned connecting slope forms the groove side wall of the above-mentioned stamping groove.

[0010] Optionally, a first chamfer is provided at the connection between the bottom port of the liquid injection hole and the limiting protrusion.

[0011] Optionally, the inner diameter of at least part of the above-mentioned liquid injection groove gradually decreases from top to bottom, and the minimum inner diameter of the above-mentioned liquid injection groove is larger than the inner diameter of the above-mentioned liquid injection hole.

[0012] Optionally, the liquid injection groove includes a matching portion with a constant inner diameter and a tapered portion with an inner diameter gradually decreasing from top to bottom, and the maximum inner diameter of the tapered portion is equal to the inner diameter of the matching portion.

[0013] Optionally, the inner bottom wall of the above-mentioned liquid injection groove is flush with the top port of the above-mentioned liquid injection hole.

[0014] Optionally, a second chamfer is provided at the connection between the inner bottom wall of the above-mentioned liquid injection groove and the top port of the above-mentioned liquid injection hole.

[0015] Another object of the present invention is to provide a single battery, which includes the cover plate assembly as described in any of the above solutions.

[0016] Another object of the present invention is to provide an electrical device comprising the single battery described in the above solution.

[0017] Beneficial effects:

[0018] The cover plate assembly in the present invention is used to inject electrolyte through the injection hole opened on the cover plate body. The top port of the injection hole is surrounded by an injection groove, and the bottom port is surrounded by a stamping groove. The injection groove and the stamping groove are both manufactured by a stamping process. Since the stamping groove is stamped, the mechanical strength around the injection hole is improved when the injection groove and the injection hole are stamped. When the injection groove is punched out, support is provided for the circumference of the injection groove, ensuring that the roundness and precision of the injection groove after processing meet the requirements, so that the sealing nail and the injection groove can be matched more tightly when installed, thereby improving the subsequent welding quality and ensuring the sealing effect of the sealing nail on the injection hole and the injection groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axonometric view of the cover plate assembly provided in a specific embodiment of the present utility model;

[0020] Figure 2 It is a top view of the cover plate assembly provided in a specific embodiment of the present utility model;

[0021] Figure 3 yes Figure 2 Cross-section at AA in the middle.

[0022] In the picture:

[0023] 100. Cover plate body; 110. Liquid injection hole; 111. First chamfer; 112. Second chamfer; 120. Stamping groove; 130. Limiting protrusion; 131. Connecting portion; 132. Platform portion; 133. Connecting slope; 140. Liquid injection groove; 141. Fitting portion; 142. Tapered portion; 150. Sealing nail; 200. Pole assembly. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0025] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0028] like Figure 1 and Figure 2 As shown, the cover assembly in this embodiment includes a cover body 100, a pole assembly 200 and a sealing nail 150. The pole assembly 200 and the sealing nail 150 are both inserted into the cover body 100. This is a common structure of the cover assembly of the battery and will not be repeated here.

[0029] like Figure 3 As shown, when the existing sealing pin 150 is used to seal and fix the liquid injection hole 110, the precision of the fit between the sealing pin 150 and the liquid injection hole 110 is not very good due to the limited processing precision of the liquid injection hole 110, resulting in gaps at the weld, which is prone to leakage, resulting in reduced safety of the single battery using the cover plate assembly. In order to improve the fit between the sealing pin 150 and the liquid injection hole 110, the cover plate assembly of this embodiment is provided with the liquid injection hole 110 on the cover plate body 100. A stamped groove 120 is provided at the bottom of the cover plate body 100 and surrounds the bottom end of the liquid injection hole 110. A liquid injection groove 140 is stamped and formed at the top of the cover plate body 100 and surrounds the top end of the liquid injection hole 110. The sealing pin 150 is inserted into the liquid injection groove 140 and is welded to the liquid injection groove 140.

[0030] The cover plate assembly in this embodiment is filled with electrolyte through the injection hole 110 opened on the cover plate body 100, and the top port of the injection hole 110 is surrounded by an injection groove 140, and the bottom port is surrounded by a stamping groove 120. The injection groove 140 and the stamping groove 120 are both manufactured by a stamping process. Since the stamping groove 120 is stamped, the stamping groove 120 improves the mechanical strength around the injection hole 110 when the injection groove 140 and the injection hole 110 are stamped. When the injection groove 140 is punched out, support is provided for the circumference of the injection groove 140, ensuring that the roundness and precision of the injection groove 140 after processing meet the requirements, so that the sealing nail 150 and the injection groove 140 can be more tightly matched when installed, thereby improving the subsequent welding quality and ensuring the sealing effect of the sealing nail 150 on the injection hole 110 and the injection groove 140.

[0031] Furthermore, a limiting protrusion 130 is provided at the bottom of the cover body 100 and surrounds the bottom end of the liquid injection hole 110. The liquid injection hole 110 extends through the limiting protrusion 130, and the stamping groove 120 is provided around the limiting protrusion 130. The limiting protrusion 130 provided below the cover body 100 increases the thickness of the cover body 100 at the liquid injection hole 110, improving the mechanical strength of the cover body 100. At the same time, when the lower plastic component is installed below the cover body 100, the lower plastic component and the liquid injection hole 110 can be more tightly matched, thereby improving the sealing effect of the lower plastic component.

[0032] In this embodiment, the stopper protrusion 130 includes a connecting portion 131 and a platform portion 132. The connecting portion 131 is circumferentially disposed around the circumferential outer wall of the platform portion 132. The bottom wall of the platform portion 132 is parallel to the bottom wall of the cover body 100. The circumferential outer wall of the connecting portion 131 comprises an inclined connecting surface 133, which gradually decreases the outer diameter of the stopper protrusion 130 from top to bottom. At least a portion of the connecting surface 133 forms the sidewall of the punching groove 120. It will be appreciated that the stopper protrusion 130 is formed into a tapered shape with a gradually decreasing outer diameter in the downward direction. This configuration reduces the size of the stopper protrusion 130 and serves as a guide and limiter for the installation of the lower plastic component, thereby facilitating the installation of the cover body 100 and the lower plastic component of the battery. Furthermore, the integral molding of the stopper protrusion 130 with the cover body 100 simplifies the structure of the entire cover assembly, facilitates its processing, and reduces manufacturing costs.

[0033] like Figure 3 As shown, a first chamfer 111 is provided at the connection between the bottom port of the injection hole 110 and the limiting protrusion 130. The provision of the first chamfer 111 facilitates the installation of the lower plastic part, reduces burrs and edges at the connection, and improves processing quality.

[0034] Furthermore, the inner diameter of at least part of the injection groove 140 gradually decreases from top to bottom, and the minimum inner diameter of the injection groove 140 is larger than the inner diameter of the injection hole 110. Thus, the injection groove 140 is formed into an inverted cone funnel shape, which can facilitate the injection of electrolyte.

[0035] In this embodiment, the liquid injection groove 140 includes a mating portion 141 with a constant inner diameter and a tapered portion 142 with a gradually decreasing inner diameter from top to bottom. The maximum inner diameter of the tapered portion 142 is equal to the inner diameter of the mating portion 141. The mating portion 141 is designed to mate with the top circumference of the sealing pin 150 for installation, increasing the contact area between the sealing pin 150 and the liquid injection groove 140, facilitating subsequent assembly during welding, improving welding quality, and thus enhancing sealing performance.

[0036] As a preferred embodiment, the inner bottom wall of the liquid injection groove 140 is flush with the top end of the liquid injection hole 110. Because the inner bottom wall of the liquid injection groove 140 and the top end of the liquid injection hole 110 are aligned, when the electrolyte is poured from the liquid injection groove 140 into the liquid injection hole 110 and the interior of the single battery, it is possible to prevent the electrolyte from remaining on the inner bottom wall of the liquid injection groove 140 and preventing corrosion damage to the cover plate body 100.

[0037] In another optional embodiment, the bottom wall of the injection groove 140 can also be set to be slightly inclined toward the top port of the injection hole 110 to facilitate the electrolyte to flow into the injection hole 110 along the inclined bottom wall of the injection groove 140, which will not be repeated here.

[0038] Furthermore, a second chamfer 112 is provided at the junction between the inner bottom wall of the liquid injection groove 140 and the top end of the liquid injection hole 110. The provision of the second chamfer 112 facilitates the flow of electrolyte into the liquid injection hole 110 without leaving any residue, while also reducing burrs and edges at the junction, improving processing quality, and preventing burrs from falling into the single cell and damaging the electrode, thereby enhancing safety and reliability.

[0039] This embodiment also provides a single cell battery, which includes a top cover assembly as described in any of the above schemes. The single cell battery has the beneficial effects of the top cover assembly described in any of the above schemes, which will not be repeated here. Specifically, the top port of the liquid injection hole 110 of the single cell battery is surrounded by a liquid injection groove 140, and the bottom port is surrounded by a stamping groove 120. The liquid injection groove 140 and the stamping groove 120 are both manufactured by a stamping process to ensure that the roundness and precision of the liquid injection groove 140 after processing meet the requirements, so that the sealing nail 150 and the liquid injection groove 140 can be more tightly matched when installed, thereby improving the subsequent welding quality and ensuring the sealing effect of the sealing nail 150 on the liquid injection hole 110 and the liquid injection groove 140, thereby improving the safety and reliability of the single cell battery.

[0040] This embodiment further provides an electrical device comprising the single battery described in the above embodiment. The electrical device may be an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as it uses electricity as an energy source, and will not be described in detail here.

[0041] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Cover plate assembly, characterized in that, The invention comprises a cover plate body (100), wherein the cover plate body (100) is provided with a liquid injection hole (110), a stamping groove (120) is provided at the bottom of the cover plate body (100) and around the bottom port of the liquid injection hole (110), and a liquid injection groove (140) is stamped and formed at the top of the cover plate body (100) and around the top port of the liquid injection hole (110), a sealing pin (150) is inserted in the liquid injection groove (140), and the sealing pin (150) is welded to the liquid injection groove (140).

2. The cover plate assembly according to claim 1, wherein: A limiting protrusion (130) is provided at the bottom of the cover plate body (100) and around the bottom port of the liquid injection hole (110); the liquid injection hole (110) passes through the limiting protrusion (130); and the stamping groove (120) is provided around the limiting protrusion (130).

3. The cover plate assembly according to claim 2, wherein: The limiting protrusion (130) includes a connecting portion (131) and a platform portion (132), wherein the connecting portion (131) is arranged around the circumferential outer wall of the platform portion (132), and the bottom wall of the platform portion (132) is arranged parallel to the bottom wall of the cover plate body (100). The circumferential outer wall of the connecting portion (131) is an inclined connecting slope (133) so that the outer diameter of the limiting protrusion (130) gradually decreases from top to bottom, and at least part of the connecting slope (133) forms the groove side wall of the stamping groove (120).

4. The cover plate assembly according to claim 2, wherein: A first chamfer (111) is provided at the connection between the bottom port of the liquid injection hole (110) and the limiting protrusion (130).

5. The cover plate assembly according to claim 1, wherein: The inner diameter of at least part of the liquid injection groove (140) gradually decreases from top to bottom, and the minimum inner diameter of the liquid injection groove (140) is greater than the inner diameter of the liquid injection hole (110).

6. The cover plate assembly according to claim 5, wherein: The injection groove (140) comprises a matching portion (141) whose inner diameter remains unchanged and a tapered portion (142) whose inner diameter gradually decreases from top to bottom, and the maximum inner diameter of the tapered portion (142) is equal to the inner diameter of the matching portion (141).

7. The cover plate assembly according to claim 1, wherein: The inner bottom wall of the liquid injection groove (140) is flush with the top end of the liquid injection hole (110).

8. The cover plate assembly according to claim 5, wherein: A second chamfer (112) is provided at the connection between the inner bottom wall of the liquid injection groove (140) and the top port of the liquid injection hole (110).

9. A single cell battery, characterized in that: The invention comprises the cover plate assembly according to any one of claims 1 to 8.

10. Electrical equipment, characterized in that: The invention comprises the single cell battery as claimed in claim 9.

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