Negative pole and battery cover plate

Abstract

The utility model provides a negative pole and a battery cover plate, and relates to the technical field of energy storage components. The negative pole comprises an aluminum main body part, a copper extension part and an upper insulation sealing piece; the copper extension part is arranged at the bottom of the aluminum main body part; the bottom of the copper extension part is provided with an insulation connection step, and the insulation connection step is provided with a reinforcing connection ring groove. The upper insulation sealing piece covers the aluminum main body part, and the upper insulation sealing piece is provided with a connecting ring matched with the reinforcing connecting ring groove. The battery cover plate comprises a cover plate, a positive pole, a lower insulation sealing piece and a negative pole; the negative pole and the positive pole are both arranged on the cover plate, and upper insulation sealing pieces are arranged between the negative pole and the cover plate and between the positive pole and the cover plate; the lower insulation sealing piece is arranged at the bottom of the cover plate. The technical effect of reducing the sealing failure probability of the negative pole is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage components, in particular to a negative pole and a battery cover. Background Art

[0002] With the rapid development of new energy technologies, various new technologies have sprung up everywhere. Taking the cover manufacturing process as an example, the nano injection molding process leads the traditional cover manufacturing process in terms of cover sealing, strength, overcurrent, manufacturing efficiency and cost, as well as its absolute advantages. Since the nano injection molding process saves the sealing ring, the sealing relies on the close combination of the micro-nano inverted cone holes on the metal surface after chemical treatment and the plastic for sealing. Therefore, chemical treatment is the top priority of this process and the key to success or failure. Since the chemical treatment of the pole and the cover is an integral treatment, when combined with the plastic, it means that the sealing surface is larger, and local sealing failure is not easy to detect, which has no effect on the positive pole (pure aluminum). However, if the local sealing failure of the negative pole (copper-aluminum composite) occurs, especially at the copper-aluminum interface, it is easy to cause electrochemical corrosion and quickly cause sealing failure, which poses a great safety hazard to the battery. Utility Model Content

[0003] The utility model aims to provide a negative pole column and a battery cover plate to alleviate the technical problem of negative pole column sealing failure in the prior art.

[0004] In a first aspect, an embodiment of the utility model provides a negative electrode post, comprising an aluminum main body, a copper extension, and an upper insulating seal;

[0005] The copper extension portion is disposed at the bottom of the aluminum main body portion;

[0006] An insulating connection step is provided at the bottom of the copper extension portion, and a reinforcing connection ring groove is provided on the insulating connection step;

[0007] The upper insulating seal covers the aluminum main body, and has a connecting ring matched with the reinforced connecting ring groove.

[0008] In combination with the first aspect, an embodiment of the utility model provides a possible implementation of the first aspect, wherein a first step for positioning the top of the sealant during nano-injection molding of the upper insulating seal is provided on the top of the aluminum main body.

[0009] In combination with the first aspect, an embodiment of the utility model provides a possible implementation of the first aspect, wherein the outer periphery of the above-mentioned aluminum main body is provided with a second step for increasing the contact area between the aluminum main body and the upper insulating seal.

[0010] In combination with the first aspect, an embodiment of the utility model provides a possible implementation of the first aspect, wherein the longitudinal section of the reinforced connecting ring groove is in the shape of an inverted trapezoid or an inverted cone.

[0011] In combination with the first aspect, an embodiment of the utility model provides a possible implementation of the first aspect, wherein the longitudinal section of the reinforced connecting ring groove is semicircular or square.

[0012] In combination with the first aspect, the embodiment of the utility model provides a possible implementation of the first aspect, wherein the bottom of the copper extension portion is lower than the bottom of the upper insulating seal.

[0013] In combination with the first aspect, the embodiment of the utility model provides a possible implementation of the first aspect, wherein a height difference H between the bottom of the copper extension portion and the bottom of the upper insulating seal is between 0.1-0.3 mm.

[0014] In combination with the first aspect, the embodiment of the utility model provides a possible implementation of the first aspect, wherein the height difference H between the bottom of the copper extension portion and the bottom of the upper insulating seal is 0.2 mm.

[0015] In a second aspect, an embodiment of the utility model provides a battery cover, including a cover, a positive electrode post, a lower insulating seal and the negative electrode post;

[0016] The negative electrode column and the positive electrode column are both arranged on the cover plate, and the upper insulating seal is arranged between the negative electrode column and the positive electrode column and the cover plate;

[0017] The lower insulating seal is disposed at the bottom of the cover plate.

[0018] In combination with the second aspect, the embodiment of the utility model provides a possible implementation of the second aspect, wherein an explosion-proof valve is provided on the cover plate.

[0019] Beneficial effects:

[0020] The utility model provides a negative pole, comprising an aluminum main body, a copper extension and an upper insulating seal; the copper extension is arranged at the bottom of the aluminum main body; an insulating connection step is provided at the bottom of the copper extension, and a reinforced connection ring groove is provided on the insulating connection step; the upper insulating seal covers the aluminum main body, and the upper insulating seal has a connection ring adapted to the reinforced connection ring groove.

[0021] Specifically, in the process of nano-injection molding to form the upper insulating seal, the nano-injection molding glue can quickly fill the space between the aluminum main body and the copper extension and the cover plate, thereby covering the periphery of the aluminum main body and the copper extension, and then the nano-injection molding glue can quickly fill the insulating connection step at the bottom of the copper extension downward, and then quickly fill the reinforced connection ring groove on the insulating connection step, thereby greatly increasing the sealing area of ​​the copper extension, and then ensuring the sealing at the copper-aluminum interface, thereby ensuring the reliability of the negative electrode column sealing and improving the safety performance of the secondary battery.

[0022] The utility model provides a battery cover, comprising a cover, a positive pole, a lower insulating seal and a negative pole; the negative pole and the positive pole are both arranged on the cover, and an upper insulating seal is arranged between the negative pole and the positive pole and the cover; the lower insulating seal is arranged at the bottom of the cover. Compared with the prior art, the battery cover has the above advantages, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods 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 A schematic diagram of the structure of the negative electrode column provided by an embodiment of the utility model;

[0025] Figure 2 A schematic diagram of the bottom of a negative electrode column provided in an embodiment of the utility model;

[0026] Figure 3 A cross-sectional view of an aluminum main body and a copper extension portion of a negative electrode pole provided in an embodiment of the utility model;

[0027] Figure 4 A schematic diagram of the structure of a battery cover provided by an embodiment of the utility model;

[0028] Figure 5 A cross-sectional view of a battery cover provided by an embodiment of the utility model;

[0029] Figure 6 for Figure 5 A partial enlarged view of point A in the middle.

[0030] icon:

[0031] 100-aluminum main body; 110-first step; 120-second step;

[0032] 200-copper extension; 210-insulation connection step; 211-reinforced connection ring groove;

[0033] 300 - upper insulating seal;

[0034] 410 - cover plate; 420 - positive pole; 430 - lower insulating seal; 440 - explosion-proof valve. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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.

[0039] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0040] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, this embodiment provides a negative electrode pole, including an aluminum main body 100, a copper extension 200 and an upper insulating seal 300; the copper extension 200 is arranged at the bottom of the aluminum main body 100; an insulating connection step 210 is opened at the bottom of the copper extension 200, and a reinforced connection ring groove 211 is opened on the insulating connection step 210; the upper insulating seal 300 covers the aluminum main body 100, and the upper insulating seal 300 has a connection ring adapted to the reinforced connection ring groove 211.

[0041] The longitudinal section of the reinforced connection ring groove 211 is in the shape of an inverted trapezoid or an inverted cone.

[0042] The longitudinal section of the reinforced connection ring groove 211 is semicircular or square.

[0043] Specifically, in the process of nano-injection molding to form the upper insulating seal 300, the nano-injection molding glue can quickly fill the space between the aluminum main body 100 and the copper extension 200 and the cover plate 410, thereby covering the periphery of the aluminum main body 100 and the copper extension 200, and then the nano-injection molding glue can quickly fill the insulating connection step 210 at the bottom of the copper extension 200 downward, and then quickly fill the reinforced connection ring groove 211 on the insulating connection step 210, thereby greatly increasing the sealing area of ​​the copper extension 200, and then ensuring the sealing at the copper-aluminum interface, thereby ensuring the reliability of the negative electrode column sealing and improving the safety performance of the secondary battery.

[0044] See also Figure 1 - Figure 6 As shown, in an optional solution of this embodiment, a first step 110 for positioning the top of the sealant is provided at the top of the aluminum main body 100 when the insulating seal 300 is nano-injection molded.

[0045] Specifically, the first step 110 of the aluminum body 100 is used to fit the sealing glue positioning platform of the mold when the mold is closed when molding the upper insulating seal 300, so as to avoid glue overflow and not affect the appearance of the upper insulating seal 300. That is, through the provision of the first step 110, the upper insulating seal 300 produced by nano injection molding does not cover the top of the aluminum body 100, but is coated on the outer periphery of the aluminum body 100.

[0046] See also Figure 1 - Figure 6 As shown, in an optional solution of this embodiment, a second step 120 is provided on the outer periphery of the aluminum main body 100 for increasing the contact area between the aluminum main body 100 and the upper insulating seal 300 .

[0047] Specifically, the second step 120 of the aluminum body 100 is used to strengthen the pull-out force of the negative electrode column in the Z-axis direction and increase the fixing strength of the negative electrode column. During the nano injection molding process, the nano injection molding glue can quickly fill the gap between the second step 120 of the aluminum body 100 and the cover plate 410 to form an undercut, thereby enhancing the pull-out force and fixing strength of the negative electrode column in the Z-axis direction.

[0048] See also Figure 1 - Figure 6 As shown, in an alternative solution of this embodiment, the bottom of the copper extension 200 is lower than the bottom of the upper insulating seal 300 .

[0049] The height difference H between the bottom of the copper extension part 200 and the bottom of the upper insulating seal 300 is between 0.1 mm and 0.3 mm.

[0050] The height difference H between the bottom of the copper extension 200 and the bottom of the upper insulating seal 300 is 0.1 mm. Alternatively, the height difference H between the bottom of the copper extension 200 and the bottom of the upper insulating seal 300 is 0.2 mm. Alternatively, the height difference H between the bottom of the copper extension 200 and the bottom of the upper insulating seal 300 is 0.3 mm.

[0051] Specifically, by strengthening the setting of the connection ring groove 211, when the upper insulating seal 300 is nano-injected on the negative electrode pole, the nano-injection molding glue can more easily fill the insulating connection step 210 of the copper extension 200, and the nano-injection molding glue can fill the strengthened connection ring groove 211, and after the nano-injection molding is completed to form the upper insulating seal 300, the upper insulating seal 300 can cover the outer periphery of the aluminum main body 100, and the upper insulating seal 300 can be flanged and covered on the insulating connection step 210 of the copper extension 200, ensuring the sealing at the copper-aluminum interface, thereby compensating for the local defects of the negative electrode pole due to the insufficient area of ​​the copper extension 200, which further leads to electrochemical corrosion and sealing failure at the copper-aluminum joint surface, thereby ensuring the reliability of the negative electrode pole sealing and improving the safety performance of the secondary battery.

[0052] See also Figure 1 - Figure 6 As shown, this embodiment provides a battery cover, including a cover 410, a positive electrode column 420, a lower insulating seal 430 and a negative electrode column; the negative electrode column and the positive electrode column 420 are both arranged on the cover 410, and an upper insulating seal 300 is arranged between the negative electrode column and the positive electrode column 420 and the cover 410; the lower insulating seal 430 is arranged at the bottom of the cover 410.

[0053] Wherein, an explosion-proof valve 440 is disposed on the cover plate 410 .

[0054] Specifically, the battery cover provided in this embodiment has the advantages of the above-mentioned negative electrode column compared with the prior art, which will not be described in detail here.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A negative electrode column, characterized in that: include: Aluminum body portion (100), copper extension portion (200) and upper insulating seal (300); The copper extension part (200) is arranged at the bottom of the aluminum main body part (100); An insulating connection step (210) is provided at the bottom of the copper extension portion (200), and a reinforcing connection ring groove (211) is provided on the insulating connection step (210); The upper insulating seal (300) covers the aluminum main body (100), and the upper insulating seal (300) has a connection ring adapted to the reinforced connection ring groove (211).

2. The negative electrode column according to claim 1, characterized in that: The top of the aluminum main body (100) is provided with a first step (110) for positioning the topmost portion of the sealant during nano-injection molding of the upper insulating seal (300).

3. The negative electrode column according to claim 1, characterized in that: The outer periphery of the aluminum main body (100) is provided with a second step (120) for increasing the contact area between the aluminum main body (100) and the upper insulating seal (300).

4. The negative electrode column according to claim 1, characterized in that: The longitudinal section of the reinforced connecting ring groove (211) is in the shape of an inverted trapezoid or an inverted cone.

5. The negative electrode column according to claim 1, characterized in that: The longitudinal section of the reinforced connecting ring groove (211) is semicircular or square.

6. The negative electrode column according to any one of claims 1 to 5, characterized in that: The bottom of the copper extension (200) is lower than the bottom of the upper insulating seal (300).

7. The negative electrode column according to claim 6, characterized in that: A height difference H between the bottom of the copper extension part (200) and the bottom of the upper insulating seal (300) is between 0.1 and 0.3 mm.

8. The negative electrode column according to claim 7, characterized in that: The height difference H between the bottom of the copper extension part (200) and the bottom of the upper insulating seal (300) is 0.2 mm.

9. A battery cover, characterized in that: It comprises a cover plate (410), a positive pole (420), a lower insulating seal (430) and a negative pole according to any one of claims 1 to 8; The negative electrode column and the positive electrode column (420) are both arranged on the cover plate (410), and the upper insulating seal (300) is arranged between the negative electrode column and the positive electrode column (420) and the cover plate (410); The lower insulating seal (430) is disposed at the bottom of the cover plate (410).

10. The battery cover according to claim 9, characterized in that: An explosion-proof valve (440) is provided on the cover plate (410).

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