Cover plate structure and lithium ion battery

Abstract

The utility model relates to battery technical field, propose a kind of cover plate structure and lithium ion battery, including pole, light aluminum plate, pin and sealing ring, wherein, pole is ladder columnar structure, pole is through light aluminum plate, and the local of pole large diameter end corresponds light aluminum plate;Pin is sleeved on the small diameter end of pole, and pin local corresponds light aluminum plate;Sealing ring is sleeved on pole, and sealing ring is located between light aluminum plate and pin.The application is set to ladder columnar structure by setting pole, so it is convenient to assemble to light aluminum plate, it is convenient to cooperate pin and hold light aluminum plate and sealing ring, it is favorable to improve sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate structure and a lithium-ion battery. Background Technology

[0002] Lithium-ion batteries are the energy components of electric vehicles. They are usually composed of several cylindrical or prismatic batteries. In the prismatic battery structure, it consists of a casing component and a cover plate component. The terminals are integrated on the cover plate component. To prevent leakage at the terminal integration point, good sealing is required.

[0003] A utility model patent with authorization announcement number CN218215413U discloses a lithium battery cover sealing structure, including an electrode post, a sealing ring, an upper plastic and a smooth aluminum plate. The sealing ring is provided at the bottom of the outer periphery of the electrode post and is integrally formed with the electrode post. The smooth aluminum plate has a through hole, and the electrode post passes through the through hole of the smooth aluminum plate and the smooth aluminum plate is in contact with the upper surface of the sealing ring. An annular groove gap is provided between the smooth aluminum plate and the electrode post for the upper plastic to be inserted. The upper plastic is located above the sealing ring and is spaced apart from the upper surface of the sealing ring.

[0004] In the above technical solution, the pole adopts an integrated structure, with the upper end used as the input and output terminal and the lower end used to connect the electrode of the battery cell. Since the pole is large at both ends and small in the middle, it is inconvenient to integrate the components. Therefore, some components need to be expanded before assembly, which will affect the sealing stability to some extent. Utility Model Content

[0005] In view of this, this utility model proposes a cover plate structure with good sealing performance and a lithium-ion battery to solve the problem that the existing electrode and cover plate mating structure is inconvenient to assemble and affects the sealing performance.

[0006] The technical solution of this utility model is implemented as follows: On the one hand, this utility model provides a cover plate structure, including an electrode post, a light aluminum plate, pins, and a sealing ring, wherein, The pole has a stepped columnar structure, the pole penetrates the aluminum plate, and the large diameter end of the pole corresponds locally to the aluminum plate. The pins are fitted onto the small-diameter end of the pole piece, and the pins partially correspond to the light aluminum plate; The sealing ring is fitted onto the pole post and is located between the aluminum plate and the pin.

[0007] Based on the above technical solutions, preferably, the inner ring of the sealing ring is fixed by clamping and fixing with pole posts and pins, and the outer ring of the sealing ring is fixed by clamping and fixing with aluminum plates and pins.

[0008] Based on the above technical solutions, preferably, a lower plastic is also included, which is disposed between the aluminum plate and the pin, and the sealing ring corresponds to the lower plastic.

[0009] Based on the above technical solutions, the preferred option also includes an upper plastic sleeve, which is fitted onto the electrode post; The aluminum plate has a first inner hole, and the end face of the plastic plate corresponds to the wall of the first inner hole to leave room for accommodating it.

[0010] Based on the above technical solutions, preferably, the lower plastic has a second inner hole, and the sealing ring is arranged inside the second inner hole.

[0011] Based on the above technical solutions, preferably, the volume of the accommodating space and the second inner hole is greater than the volume of the sealing ring.

[0012] Based on the above technical solutions, preferably, the sealing ring has a ring-shaped structure, and the part of the sealing ring that is clamped and fixed by the pole, the pin and the light aluminum plate has a radial distance ≥2.2mm.

[0013] Based on the above technical solutions, preferably, the electrode post has a four-step stepped columnar structure, with the four steps of the electrode post corresponding to plastic, aluminum plate, sealing ring and pin respectively from the large diameter end to the small diameter end.

[0014] Based on the above technical solutions, the preferred option is the upper plastic step corresponding to the large diameter end of the pole post, and the adjacent first-level step.

[0015] On the other hand, this utility model provides a lithium-ion battery, including the above-mentioned cover plate structure.

[0016] The cover plate structure and lithium-ion battery of this utility model have the following advantages over the prior art: (1) By setting the pole post to a stepped column structure, it is easy to assemble it onto the aluminum plate, and it is also easy to clamp the aluminum plate and sealing ring with the pin, which is beneficial to improving the sealing performance. (2) The sealing ring is clamped and fixed by the pole, the pin and the light aluminum plate, and the upper plastic is provided between the pole and the light aluminum plate, which can further seal the gap to prevent leakage. (3) An accommodating space is formed between the upper plastic and the sealing ring, and a second inner hole is opened in the lower plastic. In this way, after the sealing ring is compressed, it can extend into the accommodating space and the second inner hole, thereby increasing the contact area between the sealing ring and the pole, the aluminum plate and the pin, which is beneficial to further improve the sealing performance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an exploded view of the cover plate structure of this utility model; Figure 2 This is a cross-sectional view of the cover plate structure of this utility model; In the diagram: 1. Pole post; 2. Plain aluminum plate; 201. First inner hole; 2011. Accommodation space; 3. Pin; 4. Sealing ring; 5. Lower plastic; 501. Second inner hole; 6. Upper plastic. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0025] like Figures 1-2 As shown, the cover plate structure of this utility model includes a pole post 1, a light aluminum plate 2, a pin 3, a sealing ring 4, a lower plastic 5, and an upper plastic 6.

[0026] like Figures 1-2 As shown, the pole post 1 has a stepped columnar structure, the pole post 1 penetrates the aluminum plate 2, and the large diameter end of the pole post 1 corresponds to the aluminum plate 2 in part; the pin 3 is sleeved on the small diameter end of the pole post 1, and the pin 3 corresponds to the aluminum plate 2 in part; the sealing ring 4 is sleeved on the pole post 1, and the sealing ring 4 is located between the aluminum plate 2 and the pin 3. As described above, the pole post 1 is set as a stepped columnar structure, so that one end is small and the other end is large. It can pass through the light aluminum plate 2 through the small diameter end and then be connected and fixed with the pin 3, thereby ensuring the convenience of assembly. Among them, a sealing ring 4 is also fitted on the pole post 1. Since the large diameter end of the pole post 1 corresponds to the light aluminum plate 2, when the pole post 1 is connected to the pin 3, pressure can be applied to the light aluminum plate 2 to cooperate with the pin 3 to press and fix the sealing ring 4, thereby improving the sealing performance. Furthermore, the pole post 1 can also work with the pin 3 to clamp the sealing ring 4, thereby further increasing the sealing area and preventing leakage. The large-diameter end of pole 1 is used to connect to electrical components such as busbars to achieve charging; pin 3 is used to connect to the bare battery cell.

[0027] like Figure 2 As shown, the inner ring of the sealing ring 4 is clamped and fixed by the pole post 1 and the pin 3, and the outer ring of the sealing ring 4 is clamped and fixed by the aluminum plate 2 and the pin 3. As described above, when the sealing ring 4 is installed, its inner ring is clamped and fixed by the pole post 1 and the pin 3, and its outer ring is clamped and fixed by the aluminum plate 2 and the pin 3, thereby achieving double sealing.

[0028] like Figure 2 As shown, the lower plastic 5 is placed between the aluminum plate 2 and the pin 3, and the sealing ring 4 corresponds to the lower plastic 5; As described above, the lower plastic 5 is used to connect the battery housing, and the lower plastic 5 is placed between the aluminum plate 2 and the pin 3, which leaves space for the sealing ring 4. Specifically, the thickness of the sealing ring 4 is greater than the thickness of the lower plastic 5 so that the sealing ring 4 can be compressed, and the amount of compression is controlled by the thickness of the lower plastic 5, thereby ensuring a good sealing effect.

[0029] like Figure 2 As shown, the upper plastic 6 is fitted onto the pole post 1; the aluminum plate 2 has a first inner hole 201, and the end face of the upper plastic 6 corresponds to the hole wall of the first inner hole 201 to leave a accommodating space 2011. As described above, the upper plastic 6 is clamped between the pole post 1 and the aluminum plate 2, which helps to further improve the sealing performance; The aluminum plate 2 has a first inner hole 201 to accommodate the pole post 1 and the upper plastic 6. Since the end face of the upper plastic 6 corresponds to the hole wall of the first inner hole 201, a accommodating space 2011 is formed inside the first inner hole 201. When the sealing ring 4 is compressed, it can extend into the accommodating space 2011, thereby increasing the contact area between the sealing ring and the pole post 1 and the aluminum plate 2, thereby improving the sealing performance.

[0030] like Figure 2 As shown, the lower plastic 5 has a second inner hole 501, and the sealing ring 4 is arranged inside the second inner hole 501; As described above, the lower plastic 5 has a second inner hole 501 to accommodate the sealing ring 4 and the pole post 1. When the sealing ring 4 is compressed, it can extend within the second inner hole 501, thereby increasing the contact area with the aluminum plate 2 and the pin 3 to further improve the sealing performance.

[0031] Specifically, the volume of the accommodating space 2011 and the second inner hole 501 is greater than the volume of the sealing ring 4, thereby allowing the sealing ring 4 to be fully extended.

[0032] Specifically, the sealing ring 4 has a ring-shaped structure. The sealing ring 4 is fixed by the pole post 1, the pin 3 and the light aluminum plate 2, with a radial distance ≥2.2mm.

[0033] like Figure 2 As shown, the pole post 1 has a four-step stepped columnar structure. The four steps of the pole post 1 correspond to the plastic 6, the aluminum plate 2, the sealing ring 4 and the pin 3 from the large diameter end to the small diameter end. As described above, the pole post 1 is a four-stage stepped columnar structure, which allows it to simultaneously contact the plastic 6, the sealing ring 4, and the pin 3, thereby ensuring the stability of the connection. This structure allows each component to be assembled individually, improving the convenience of overall assembly. Furthermore, after pin 3 is soldered to pole 1, the components are stably supported, improving sealing while ensuring the stability of the overall structure.

[0034] Specifically, the upper plastic 6 corresponds to the step at the large diameter end of the pole post 1, as well as the adjacent first-level step; thus, the upper plastic 6 and the pole post 1 have a larger contact area, which can ensure a sealing effect.

[0035] The lithium-ion battery of the present invention includes the cover plate structure described above.

[0036] Specific implementation steps: First, install the plastic 6 inside the first inner hole 201, and then install the pole post 1 inside the upper plastic 6; or integrate the upper plastic 6 and the pole post 1 into a single structure, and then pass the whole structure through the first inner hole 201. The lower plastic 5 is integrated onto the aluminum plate 2, and a sealing ring 4 is fitted onto the small diameter end of the pole post 1; Finally, pin 3 is fitted onto the small-diameter end of pole post 1, and then pin 3 is welded and fixed to pole post 1 to clamp the components and form a stable structure.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cover plate structure, characterized in that: It includes a pole post (1), a light aluminum plate (2), a pin (3), and a sealing ring (4), wherein, The pole post (1) has a stepped columnar structure, the pole post (1) penetrates the aluminum plate (2), and the large diameter end of the pole post (1) corresponds to the aluminum plate (2). The pin (3) is sleeved on the small diameter end of the pole post (1), and the pin (3) partially corresponds to the light aluminum plate (2). The sealing ring (4) is sleeved on the pole post (1), and the sealing ring (4) is located between the light aluminum plate (2) and the pin (3).

2. The cover plate structure as described in claim 1, characterized in that: The inner ring of the sealing ring (4) is clamped and fixed by the pole post (1) and the pin (3), and the outer ring of the sealing ring (4) is clamped and fixed by the aluminum plate (2) and the pin (3).

3. The cover plate structure as described in claim 2, characterized in that: It also includes a lower plastic (5), which is disposed between the light aluminum plate (2) and the pin (3), and the sealing ring (4) corresponds to the lower plastic (5).

4. The cover plate structure as described in claim 3, characterized in that: It also includes an upper plastic (6), which is sleeved on the pole post (1); The aluminum plate (2) has a first inner hole (201), and the end face of the upper plastic (6) corresponds to the hole wall of the first inner hole (201) to leave a space for accommodating (2011).

5. The cover plate structure as described in claim 4, characterized in that: The lower plastic (5) has a second inner hole (501), and the sealing ring (4) is arranged inside the second inner hole (501).

6. The cover plate structure as described in claim 5, characterized in that: The volume of the accommodating space (2011) and the second inner hole (501) is greater than the volume of the sealing ring (4).

7. The cover plate structure as described in any one of claims 2 to 6, characterized in that: The sealing ring (4) has a ring-shaped structure. The sealing ring (4) is clamped and fixed by the pole (1), the pin (3) and the light aluminum plate (2) with a radial distance ≥2.2mm.

8. The cover plate structure as described in any one of claims 4 to 6, characterized in that: The pole post (1) has a four-step columnar structure. The four steps of the pole post (1) correspond to the upper plastic (6), the light aluminum plate (2), the sealing ring (4) and the pin (3) from the large diameter end to the small diameter end.

9. The cover plate structure as described in claim 8, characterized in that: The upper plastic (6) corresponds to the step at the large diameter end of the pole post (1) and the adjacent first step.

10. A lithium-ion battery, characterized in that: Includes the cover plate structure as described in any one of claims 1 to 9.

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