Lithium battery sealing structure

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a lithium battery sealing structure which comprises a shell and an anode cover plate, first extension parts are arranged at two ends of the shell, and first included angles are formed between the first extension parts and the peripheral wall of the shell; the end, away from the shell, of the first extending part is fixedly connected with a second extending part, and a second included angle is formed between the second extending part and the first extending part. According to the lithium battery sealing structure, by arranging the conical extension part, the conical tongue piece, the second extension part and the first extension part, compared with the prior art, the shell and the positive electrode cover plate are pre-tightened during sealing, so that a stable sealing state can be still maintained under the condition of long-time use, and the service life of a lithium battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a lithium battery sealing structure. Background Art

[0002] With the continuous development of the lithium battery industry, the requirements for the safety and low cost of lithium batteries in practical applications in various industries are becoming increasingly higher. Among them, for the two-terminal tab lithium battery structure commonly used in the industry, it is particularly important to ensure the consistency of battery sealing at a low cost, which directly affects the manufacturing cost, product performance and safety of the battery.

[0003] In the battery structure of the prior art, the positive and negative electrode cover plate assemblies and the battery shell are often sealed by mechanical pressing and sealing rubber sleeve extrusion to facilitate engineering mass production. However, the following defects are found in the actual production and manufacturing of lithium batteries: effective pre-tightening cannot be formed between the positive and negative electrode cover plate assemblies of the lithium battery and the battery shell. Once the sealant between the positive and negative electrode cover plate assemblies and the battery shell ages, it is easy to cause the positive and negative electrode cover plate assemblies and the battery shell to separate. Therefore, a stable sealing shape cannot be formed between the positive and negative electrode cover plate assemblies and the battery shell for a long time. Utility Model Content

[0004] The utility model aims to provide a lithium battery sealing structure to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lithium battery sealing structure, comprising a shell and a positive electrode cover plate, wherein both ends of the shell are provided with a first extension portion, the first extension portion and the peripheral wall of the shell are arranged at a first angle, the first extension portion is fixedly connected to an end of the first extension portion away from the shell, the second extension portion and the first extension portion are arranged at a second angle, the second extension portion is fixedly connected to an end of the second extension portion away from the first extension portion, the third extension portion and the second extension portion are arranged at a third angle, and the second angle is greater than the third angle and less than the first angle;

[0006] The positive electrode cover plate is arranged on the upper part of the shell, and a conical extension portion is arranged at the lower part of the positive electrode cover plate, and a conical tongue piece is arranged at the lower part of the conical extension portion. The conical extension portion and the conical tongue piece are arranged at a fourth angle, and the fourth angle is inclined upward, and the conical tongue piece elastically abuts against the second extension portion.

[0007] Furthermore, one end of the conical extension away from the positive electrode cover plate is fixedly connected with a top column.

[0008] Furthermore, a battery cell is fixedly loaded in the shell, and an end surface of the battery cell is in contact with the top column.

[0009] Furthermore, a positive electrode tab is fixedly arranged on the positive electrode cover plate.

[0010] Furthermore, a negative electrode cover plate is provided at the lower part of the shell, and the connection structure of the negative electrode cover plate is the same as the connection structure of the positive electrode cover plate.

[0011] Furthermore, a negative electrode ear piece is fixedly connected to one end of the negative electrode cover away from the shell.

[0012] Furthermore, the shell is a steel shell or an aluminum shell.

[0013] Compared with the prior art, the utility model provides a lithium battery sealing structure, which has the following beneficial effects:

[0014] The lithium battery sealing structure is provided with a conical extension portion, a conical tongue piece, a second extension portion and a first extension portion. When the conical tongue piece moves to a third angle position between the second extension portion and the third extension portion, the conical tongue piece abuts against a lower portion of the second extension portion and a position close to the third extension portion. The second extension portion has an elastic force for restoring deformation in a direction away from the outer shell, and the conical tongue piece has an elastic force for restoring deformation in a direction away from the conical extension portion. Therefore, the conical tongue piece and the second extension portion elastically abut against each other. At this time, the sealant is injected between the outer shell and the positive electrode cover plate to complete the sealing of the lithium battery. Compared with the prior art, by pre-tightening the outer shell and the positive electrode cover plate during sealing, a stable sealing shape can be maintained under long-term use, thereby improving the service life of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of the utility model;

[0016] Figure 2 It is a top view of the utility model;

[0017] Figure 3 for Figure 2 Middle AA section view;

[0018] Figure 4 It is a half-section stereogram of the utility model;

[0019] Figure 5 This is a structural diagram of the positive electrode cover in the utility model;

[0020] Figure 6 It is a half-cut three-dimensional diagram of the housing in the utility model;

[0021] Figure 7 It is a half-section stereoscopic view of the cooperation between the positive electrode cover plate and the shell in the utility model.

[0022] In the figure: 100, outer shell; 110, first extension portion; 120, second extension portion; 130, third extension portion; 200, positive electrode cover plate; 210, conical extension portion; 220, conical tongue piece; 230, top column; 300, positive electrode ear piece; 400, negative electrode cover plate; 500, battery cell; 600, negative electrode ear piece. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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. Example

[0024] See also Figure 1-Figure 7 A lithium battery sealing structure includes a shell 100 and a positive electrode cover plate 200. Both ends of the shell 100 are provided with a first extension portion 110. The first extension portion 110 and the peripheral wall of the shell 100 are arranged at a first angle. The end of the first extension portion 110 away from the shell 100 is fixedly connected to the second extension portion 120. The second extension portion 120 and the first extension portion 110 are arranged at a second angle. The end of the second extension portion 120 away from the first extension portion 110 is fixedly connected to the third extension portion 130. The third extension portion 130 A third angle is formed between the positive electrode cover plate 200 and the second extension portion 120, the second angle is greater than the third angle and less than the first angle, the positive electrode cover plate 200 is arranged on the upper part of the housing 100, a positive electrode ear piece 300 is fixedly arranged on the positive electrode cover plate 200, a conical extension portion 210 is arranged at the lower part of the positive electrode cover plate 200, a conical tongue piece 220 is arranged at the lower part of the conical extension portion 210, the conical extension portion 210 and the conical tongue piece 220 are arranged at a fourth angle, the fourth angle is inclined upward, and the conical tongue piece 220 elastically abuts against the second extension portion 120.

[0025] The specific usage and function of this embodiment are as follows:

[0026] During installation, the outer shell 100 is first fixed, and then the positive electrode cover 200 is moved downward from the upper end of the outer shell 100. When the conical tongue 220 abuts against the first extension portion 110, the force arm length between the contact point and the connection point of the first extension portion 110 and the outer shell 100 is greater than the force arm length between the contact point and the connection point of the conical tongue 220 and the conical extension portion 210. Therefore, the conical tongue 220 is first deformed by force, and the conical tongue 220 is inclined in the direction close to the conical extension portion 210. The fourth angle value between the conical tongue 220 and the conical extension portion 210 is reduced, and the elastic deformation force of the conical tongue 220 is increased. When the positive electrode cover 200 continues to move downward to a certain position, the elastic force on the first extension portion 110 begins to be greater than the elastic force on the conical tongue 220. Therefore, the first extension portion 110 begins to deflect in the direction close to the inner wall of the outer shell 100. As the positive electrode cover plate 200 continues to move, when the conical tongue piece 220 moves to the third angle position between the second extension portion 120 and the third extension portion 130, the conical tongue piece 220 abuts against the lower part of the second extension portion 120 and close to the third extension portion 130. The second extension portion 120 has an elastic force to restore the deformation in the direction away from the outer shell 100, and the conical tongue piece 220 has an elastic force to restore the deformation in the direction away from the conical extension portion 210. Therefore, the conical tongue piece 220 and the second extension portion 120 elastically abut against each other. At this time, the sealant is injected between the outer shell 100 and the positive electrode cover plate 200 to complete the sealing of the lithium battery. Compared with the prior art, by pre-tightening the outer shell 100 and the positive electrode cover plate 200 during sealing, a stable sealing shape can be maintained under long-term use, thereby improving the service life of the lithium battery.

[0027] Further, such as Figure 1 and Figure 3 As shown, a negative electrode cover plate 400 is provided at the lower part of the outer shell 100. The connection structure of the negative electrode cover plate 400 is the same as the connection structure of the positive electrode cover plate 200. A negative electrode ear piece 600 is fixedly connected to the end of the negative electrode cover plate 400 away from the outer shell 100. This arrangement is to enable both ends of the outer shell 100 to form a long-term and stable sealing shape.

[0028] Further, such as Figure 3 As shown, one end of the conical extension portion 210 away from the positive electrode cover plate 200 is fixedly connected to a top column 230 , and a battery cell 500 is fixedly loaded in the housing 100 , and the end surface of the battery cell 500 contacts the top column 230 .

[0029] The top column 230 is provided to support both ends of the battery cell 500 loaded in the housing 100 , so as to keep the battery cell 500 stable in the housing 100 .

[0030] Furthermore, the housing 100 is a steel shell or an aluminum shell, which has good acid and alkali resistance, thereby ensuring long-term normal use of the lithium battery.

Claims

1. A lithium battery sealing structure, comprising a housing (100) and a positive electrode cover plate (200), characterized in that: The housing (100) is provided with a first extension portion (110) at both ends, the first extension portion (110) and the peripheral wall of the housing (100) are arranged at a first angle, one end of the first extension portion (110) away from the housing (100) is fixedly connected to a second extension portion (120), the second extension portion (120) and the first extension portion (110) are arranged at a second angle, one end of the second extension portion (120) away from the first extension portion (110) is fixedly connected to a third extension portion (130), the third extension portion (130) and the second extension portion (120) are arranged at a third angle, and the second angle is greater than the third angle and less than the first angle.

2. A lithium battery sealing structure according to claim 1, characterized in that: The positive electrode cover plate (200) is arranged on the upper part of the housing (100); a conical extension portion (210) is arranged at the lower part of the positive electrode cover plate (200); a conical tongue piece (220) is arranged at the lower part of the conical extension portion (210); the conical extension portion (210) and the conical tongue piece (220) are arranged at a fourth angle; the fourth angle is inclined upward; and the conical tongue piece (220) elastically abuts against the second extension portion (120).

3. A lithium battery sealing structure according to claim 2, characterized in that: One end of the conical extension portion (210) away from the positive electrode cover plate (200) is fixedly connected to a top column (230).

4. A lithium battery sealing structure according to claim 1, characterized in that: The housing (100) is fixedly filled with a battery core (500), and an end surface of the battery core (500) is in contact with the top column (230).

5. A lithium battery sealing structure according to claim 1, characterized in that: A positive electrode tab (300) is fixedly arranged on the positive electrode cover plate (200).

6. A lithium battery sealing structure according to claim 1, characterized in that: A negative electrode cover plate (400) is provided at the lower part of the housing (100), and the connection structure of the negative electrode cover plate (400) is the same as the connection structure of the positive electrode cover plate (200).

7. A lithium battery sealing structure according to claim 6, characterized in that: One end of the negative electrode cover plate (400) away from the housing (100) is fixedly connected to a negative electrode tab (600).

8. A lithium battery sealing structure according to claim 1, characterized in that: The housing (100) is a steel shell or an aluminum shell.

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