Cover plate assembly and battery

Abstract

The utility model relates to the field of batteries, and discloses a cover plate assembly and a battery, the battery cover plate assembly comprises: a cover plate provided with a first through hole; the cover cap comprises a cover cap body and a pole, the pole is arranged on the cover cap body, the cover cap body is connected with the cover plate in an insulating mode, the pole is led out from the first through hole, an anti-explosion groove is formed in the cover cap body and surrounds the pole, and the anti-explosion groove is communicated with the anti-explosion groove. And a tab limiting groove is formed in one surface, far away from the pole, of the cap body. The cover plate assembly can improve the production efficiency and the reliability and the safety of the battery.

Description

Technical Field

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

[0002] In the field of battery manufacturing, especially for laser-sealed steel-shell batteries, the assembly process involves multiple key technical steps in the production process, which have an important impact on the overall performance, safety and production efficiency of the battery.

[0003] Composite caps integrate multiple functional components (such as insulating sheets and terminal connection parts) into a single assembly. These functional components need to be precisely assembled and effectively connected to other components inside the battery (such as the tabs). Currently, on most production lines, the welding operation between the tabs and caps is highly dependent on the positioning accuracy of equipment and tooling. This dependence not only increases the complexity and cost of the production line, but can also lead to unstable welding quality due to equipment failure or positioning errors, thereby affecting the overall performance of the battery.

[0004] To ensure the safe release of internal pressure in abnormal situations and avoid explosion risks, steel-cased batteries are typically designed with explosion-proof grooves. However, in existing production processes, these grooves often require a separate secondary process, after the steel casing is formed. This approach not only increases production steps and costs but can also lead to inconsistent machining accuracy and dimensional deviations in the grooves.

[0005] In summary, the problems encountered in the assembly of existing laser-sealed steel-cased batteries, such as the composite cap assembly and battery explosion-proof slot processing, have become key factors restricting battery production efficiency and product quality. Therefore, in-depth research and technological innovation are necessary to address these issues in order to improve battery production efficiency and safety. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a cover plate assembly and a battery.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A cover plate assembly, comprising:

[0009] A cover plate, wherein a first through hole is formed on the cover plate;

[0010] The cap includes a cap body and a pole, the pole is arranged on the cap body, the cap body is insulated and connected to the cover plate, the pole is led out from the first through hole, an explosion-proof groove is provided on the cap body, the explosion-proof groove is arranged around the pole, and a pole ear limiting groove is provided on the side of the cap body away from the pole.

[0011] In one embodiment, the explosion-proof groove is a C-shaped explosion-proof groove arranged around the pole.

[0012] In one embodiment, the diameter of the explosion-proof groove is smaller than the diameter of the first through hole.

[0013] In one embodiment, the tab limiting groove includes a strip limiting portion and a circular limiting portion, the circular limiting portion is centrally arranged on the cap body, one end of the strip limiting portion is connected to the circular limiting portion, and the other end of the strip limiting portion extends to the edge of the cap body.

[0014] In one embodiment, the explosion-proof groove is opened in the tab limiting groove, and the explosion-proof groove is arranged around the edge of the circular limiting portion.

[0015] In one embodiment, the depth of the tab limiting groove is 0.04 to 0.06 mm.

[0016] In one embodiment, the explosion-proof groove has a depth of 0.08 to 0.12 mm.

[0017] In one embodiment, the cap body is connected to the cover plate via an insulating gasket, which is a ring-shaped insulating gasket having a second through hole. The pole passes through the second through hole and the first through hole in sequence and then leads out from the cover plate.

[0018] The present utility model also provides a battery, comprising: a shell, a battery cell and the above-mentioned cover plate assembly, wherein one end of the shell is open, the cover plate assembly and the shell together form an accommodating cavity, the battery cell is arranged in the accommodating cavity, and the cover plate is connected and sealed to the opening of the shell.

[0019] In one embodiment, the battery cell includes a battery cell body, a first pole tab and a second pole tab, the first pole tab and the second pole tab are respectively led out from the two end faces of the battery cell body, the first pole tab is welded to the shell, and the second pole tab is welded to the cap body, the shape of the second pole tab matches the shape of the pole tab limiting groove, and the second pole tab is limited in the pole tab limiting groove.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] 1. Precise positioning and cost optimization for tab welding: By adding tab limiting grooves to the cap body, the utility model provides a direct and efficient method for tab welding positioning. The tabs naturally fall into the corresponding limiting grooves before welding, without relying on complex equipment positioning or additional tooling assistance. This greatly simplifies the assembly process and reduces welding quality issues caused by inaccurate positioning. As a result, not only the consistency and efficiency of welding operations are improved, but also production costs are effectively reduced, and the reliance on high-precision equipment is reduced, making the entire production process more flexible and efficient.

[0022] 2. Integrated explosion-proof design simplifies processing: This new design integrates the explosion-proof groove directly into the cap body design, eliminating the traditional secondary processing groove cutting method on the bottom of the steel shell. This avoids additional processing steps, significantly reduces the production process, shortens the production cycle, and reduces processing costs. The integrated explosion-proof groove design also ensures higher processing accuracy and consistency, reduces stress concentration and dimensional deviation caused by processing, and further improves the reliability and safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a structural schematic diagram of a cover assembly according to one embodiment of the present invention.

[0025] Figure 2 This is a schematic structural diagram of a cap according to one embodiment of the present invention.

[0026] Figure 3 This is a schematic structural diagram of a battery according to one embodiment of the present invention.

[0027] Figure 4 This is a schematic structural diagram of a battery before sealing according to one embodiment of the present invention.

[0028] The numbers in the figure are: 10, battery; 100, shell; 110, opening; 200, battery cell; 210, battery cell body; 220, first pole ear; 230, second pole ear; 300, cover plate assembly; 310, cover plate; 311, first through hole; 320, cap; 321, cap body; 3211, explosion-proof groove; 3212, pole ear limiting groove; 3212a, strip limiting portion; 3212b, circular limiting portion; 322, pole; 330, insulating pad. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] See also Figure 1 and Figure 2 A cover plate assembly (300) comprises: a cover plate (310) and a cap (320), wherein the cover plate (310) is provided with a first through hole (311); the cap (320) comprises a cap body (321) and a pole (322), wherein the pole (322) is arranged on the cap body (321), the cap body (321) is insulated and connected to the cover plate (310), the pole (322) is led out from the first through hole (311), an explosion-proof groove (3211) is provided on the cap body (321), the explosion-proof groove (3211) is provided around the pole (322), and a pole ear limiting groove (3212) is provided on a side of the cap body (321) away from the pole (322).

[0033] It should be noted that the welding operation between the tab and the cap (320) is highly dependent on the positioning accuracy of the equipment and tooling, which not only increases the complexity and cost of the production line, but may also lead to unstable welding quality due to equipment failure or positioning error. However, the cover plate assembly (300) of the present invention is specially designed with a tab limit groove (3212) on the cap body (321). During the welding process, the tab can be accurately positioned at a predetermined position, and high-precision welding can be achieved without relying on complex tooling equipment. This not only simplifies the production process and reduces the dependence on high-precision tooling equipment, but also significantly reduces production costs.

[0034] At the same time, due to the design of the tab limiting groove (3212), the positioning during the welding process is more stable and reliable, effectively avoiding welding quality problems caused by positioning errors, and further improving the overall performance and safety of the battery (10).

[0035] Furthermore, the explosion-proof groove (3211) of the traditional steel shell battery (10) often needs to be processed twice after the steel shell is formed, and a separate groove is cut. This method not only increases the production process and cost, but may also lead to problems such as inconsistent processing accuracy and size deviation of the explosion-proof groove (3211). However, the cover plate assembly (300) of the present invention directly sets the explosion-proof groove (3211) on the cap body (321). This design eliminates the need for additional groove cutting during the production process, thereby greatly simplifying the production process and reducing production costs. Since the explosion-proof groove (3211) is designed directly on the cap body (321), it can ensure the consistency of the size and shape of the explosion-proof groove (3211) of each battery (10), effectively improving the safety performance of the battery (10).

[0036] See also Figure 1 and Figure 2 Furthermore, the explosion-proof groove (3211) is a C-shaped explosion-proof groove (3211) arranged around the pole (322).

[0037] It should be noted that the design of the C-shaped explosion-proof groove (3211) makes the overall structure of the cover assembly (300) more compact and reasonable. It is arranged around the pole (322), making full use of the space of the cap body (321), extending the length of the explosion-proof groove (3211), avoiding additional space occupied inside the battery (10), and thus helping to improve the energy density of the battery (10). Compared with traditional linear or single-position explosion-proof grooves (3211), the C-shaped design provides a more balanced stress distribution path, helping to release overpressure gas in a shorter time, effectively curbing the risk of expansion or explosion of the battery (10).

[0038] See also Figure 1 ,and Figure 2Furthermore, the diameter of the explosion-proof groove (3211) is smaller than the diameter of the first through hole (311).

[0039] It should be noted that when the cover plate (310) covers the cover cap (320) and achieves an insulating connection, if the diameter of the explosion-proof groove (3211) is larger than the first through hole (311), the cover plate (310) material may block part of the explosion-proof groove (3211) opening (110), affecting its rapid and smooth pressure relief in an emergency, thereby weakening the explosion-proof effect. However, by setting the diameter of the explosion-proof groove (3211) smaller than the first through hole (311), it is ensured that even when the two layers of the structure are tightly fitted, the explosion-proof groove (3211) can still be unobstructed, providing a clear and unobstructed release channel for the internal pressure.

[0040] See also Figure 1 and Figure 2 Furthermore, the tab limiting groove (3212) includes a strip limiting portion (3212a) and a circular limiting portion (3212b), the circular limiting portion (3212b) is centrally arranged on the cap body (321), one end of the strip limiting portion (3212a) is connected to the circular limiting portion (3212b), and the other end of the strip limiting portion (3212a) extends to the edge of the cap body (321).

[0041] It should be noted that, first, the circular limiting portion (3212b) is located in the center of the cap body (321), providing a clear initial alignment point for the tab, and the strip limiting portion (3212a) extends from the circular limiting portion (3212b) to the edge of the cap (320), forming a continuous and guiding limiting track. This design ensures that the tab can quickly and accurately find its predetermined position, reduces the adjustment time during the assembly process, and improves production efficiency. Secondly, the tab is customized into a special shape according to the contour of the limiting groove, and precisely matches the strip and circular limiting portions (3212b), which not only improves the fit during assembly, but also enhances the stability of the tab before welding through the shape locking effect. The special-shaped design effectively avoids minor movements during welding, reduces the welding defect rate, and improves welding quality.

[0042] See also Figure 1 and Figure 2 Furthermore, the explosion-proof groove (3211) is opened in the tab limiting groove (3212), and the explosion-proof groove (3211) is arranged around the edge of the circular limiting portion (3212b).

[0043] It should be noted that the explosion-proof groove (3211) is integrated into the tab limit groove (3212), which effectively utilizes the space that may have been regarded as a "dead zone" and realizes a compact layout of the internal structure of the battery (10). This design reduces the additional occupation of the battery (10) cap (320) position, which is particularly important for modern battery (10) products that pursue high energy density and lightweight design. At the same time, in the traditional battery (10) manufacturing process, the explosion-proof groove (3211) and the tab limit are usually designed and processed separately, and mold making, component production and assembly are required separately, which increases the process complexity and cost. The utility model realizes the simultaneous formation of the explosion-proof groove (3211) and the tab limit groove (3212) in the same processing process by integrating the two into an integrated design, greatly reducing the production steps, reducing the cost of mold development and switching, simplifying the production line layout, and improving resource utilization. The integrated design avoids the need for multiple positioning and alignment, significantly improves the production speed, and improves the consistency and quality control level of the cap (320).

[0044] Furthermore, the depth of the tab limiting groove (3212) is 0.04 to 0.06 mm. The depth of the tab limiting groove (3212) is selected within the range of 0.04 to 0.06 mm to provide sufficient limiting force to ensure stable positioning of the tab, while avoiding difficulty in inserting the tab due to excessive depth or unstable positioning due to excessive shallowness. This depth ensures close contact between the tab and the limiting groove, while facilitating assembly operations, thereby improving the operating efficiency and stability of the automated production line.

[0045] Furthermore, the depth of the explosion-proof groove (3211) is 0.08 to 0.12 mm. This range ensures that when the internal pressure of the battery (10) increases abnormally, the explosion-proof groove (3211) can be opened promptly and effectively to release excess gas, thereby preventing the battery (10) housing from being damaged due to excessive internal pressure. At the same time, the appropriate depth also ensures that the cap body (321) can still maintain sufficient mechanical strength after the explosion-proof groove (3211) is designed, without affecting the overall structural stability and safety of the battery (10).

[0046] See also Figure 1Furthermore, the cap body (321) and the cover plate (310) are connected via an insulating pad (330), which is an annular insulating pad (330). The insulating pad (330) has a second through hole, and the pole (322) is sequentially passed through the second through hole and the first through hole (311) and then led out from the cover plate (310). The insulating pad (330) serves as a connecting medium between the cap body (321) and the cover plate (310). The annular structure can provide a uniform and continuous insulation barrier, ensuring that the current will not flow in an unexpected path under extreme conditions, thereby ensuring the safety of the battery (10). The presence of the second through hole allows the pole (322) to pass through smoothly, while ensuring the insulation between the pole (322) and the cover plate (310) and the cap body (321), thereby improving the overall electrical safety level of the battery (10).

[0047] See also Figure 3 and Figure 4 The utility model also provides a battery (10), comprising: a shell (100), a battery cell (200) and the above-mentioned cover plate assembly (300), wherein one end of the shell (100) is open (110), the cover plate assembly (300) and the shell (100) are enclosed to form a receiving cavity, the battery cell (200) is arranged in the receiving cavity, and the cover plate (310) is connected and sealed to the opening (110) of the shell (100).

[0048] It should be noted that the shell (100) serves as the main frame of the battery (10) and is made of high-strength material. One end is designed with an opening (110) for accommodating the battery cell (200) and other internal components. The battery cell (200) is located in the shell (100) and is the energy storage unit of the battery (10), responsible for the storage and release of electrical energy. The cover assembly (300) includes key elements such as the cover (310), the pole (322), the explosion-proof groove (3211), and the tab limit groove (3212). The cover (310) and the opening (110) of the shell (100) can be connected by laser sealing technology, ensuring the airtightness and waterproofness of the battery (10). The battery (10) of the utility model not only achieves significant improvements in safety, reliability, production efficiency and space utilization by integrating the innovative cover assembly (300) and adopting laser sealing technology, but also provides an advanced solution for the design and manufacture of modern high-efficiency batteries (10).

[0049] See also Figure 3 and Figure 4Furthermore, the battery cell (200) includes a battery cell body (210), a first pole tab (220) and a second pole tab (230), the first pole tab (220) and the second pole tab (230) being respectively led out from two end surfaces of the battery cell body (210), the first pole tab (220) being welded to the shell (100), and the second pole tab (230) being welded to the cap body (321), the shape of the second pole tab (230) matching the shape of the pole tab limiting groove (3212), and the second pole tab (230) being limited in the pole tab limiting groove (3212).

[0050] It should be noted that the shape of the second tab (230) and the tab limiting groove (3212) are carefully designed to ensure a perfect match between the two. This design not only ensures the accurate positioning of the tab during assembly and avoids misalignment during welding, but also enhances the stability of the welding point through the mechanical constraint of the limiting groove, thereby improving the reliability of the battery (10) under vibration and impact conditions.

[0051] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, wherein a first through hole is formed on the cover plate; The cap includes a cap body and a pole, the pole is arranged on the cap body, the cap body is insulated and connected to the cover plate, the pole is led out from the first through hole, an explosion-proof groove is provided on the cap body, the explosion-proof groove is arranged around the pole, and a pole ear limiting groove is provided on the side of the cap body away from the pole.

2. The cover plate assembly according to claim 1, wherein: The explosion-proof groove is a C-shaped explosion-proof groove arranged around the pole.

3. The cover plate assembly according to claim 2, wherein: The diameter of the explosion-proof groove is smaller than the diameter of the first through hole.

4. The cover plate assembly according to claim 1, wherein: The limiting groove includes a strip limiting portion and a circular limiting portion, the circular limiting portion is centrally arranged on the cap body, one end of the strip limiting portion is connected to the circular limiting portion, and the other end of the strip limiting portion extends to the edge of the cap body.

5. The cover plate assembly according to claim 4, wherein: The explosion-proof groove is opened in the limiting groove, and the explosion-proof groove is arranged around the edge of the circular limiting portion.

6. The cover plate assembly according to claim 1, wherein: The depth of the limiting groove is 0.04-0.06 mm.

7. The cover plate assembly according to claim 1, wherein: The depth of the explosion-proof groove is 0.08-0.12 mm.

8. The cover plate assembly according to claim 1, wherein: The cap body is connected to the cover plate via an insulating pad. The insulating pad is an annular insulating pad having a second through hole. The pole passes through the second through hole and the first through hole in sequence and then is led out from the cover plate.

9. A battery, characterized in that: include: A shell, a battery cell, and a cover plate assembly according to any one of claims 1 to 8, wherein one end of the shell is open, the cover plate assembly and the shell together form a receiving cavity, the battery cell is arranged in the receiving cavity, and the cover plate is connected and sealed to the opening of the shell.

10. The battery according to claim 9, characterized in that The battery cell includes a battery cell body, a first pole tab and a second pole tab, the first pole tab and the second pole tab are respectively led out from the two end surfaces of the battery cell body, the first pole tab is welded to the shell, and the second pole tab is welded to the cap body, the shape of the second pole tab matches the shape of the limiting groove, and the second pole tab is limited in the limiting groove.

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