High-heat-resistance battery monomer cover plate structure and lithium battery

Abstract

The utility model relates to a high-heat-resistance battery monomer cover plate structure and a lithium battery, and belongs to the field of new energy power batteries. The top cover plate comprises a top cover plate and a terminal positioned on one side of the top cover plate; the supporting ceramic ring is supported between the terminal and the top cover plate and at least partially surrounds one end, close to the top cover plate, of the terminal so as to limit the terminal from moving towards the top cover plate; the limiting ceramic ring and the supporting ceramic ring are arranged at intervals, and the limiting ceramic ring at least partially surrounds one end, far away from the top cover plate, of the terminal so as to limit the terminal to move in the direction far away from the top cover plate; and the fixing assembly is connected with the top cover plate and at least partially surrounds the supporting ceramic ring and the limiting ceramic ring so as to fix the supporting ceramic ring, the limiting ceramic ring and the terminal on the top cover plate. According to the utility model, the structure of the cover plate terminal is simplified and improved, the ceramic rings with special structural design are adopted to limit and install the pole, the supporting ceramic rings and the limiting ceramic rings which are arranged at intervals can be convenient to process and install, and the supporting performance is improved.

Description

Technical Field

[0001] The utility model relates to the field of new energy power batteries, and in particular to a high-heat-resistant battery monomer cover plate structure and a lithium battery. Background Art

[0002] Lithium batteries are widely used in portable electronic products such as mobile phones, laptops, digital cameras, etc., due to their high energy density, no memory effect, long single-cell cycle, high efficiency, cleanliness and pollution-free. They also have good application prospects in electric vehicles and other fields. In recent years, with the vigorous development of the new energy vehicle industry, the new energy vehicle power battery technology industry has also achieved significant and effective development and progress.

[0003] The square power lithium-ion battery consists of a winding core, a shell, and a cover plate. The cover plate has holes and is equipped with terminal assemblies. In addition to being the lead-out component of the winding core pole piece, it should also have functions such as sealing, insulation, and high-temperature stability. The design of the terminal assembly structure of lithium-ion batteries is crucial to the safety performance of the battery. In order to ensure the insulation of the cover plate, the insulating parts in the current market-end terminal assembly structure design are mostly made of PPS material, which has a thermal deformation temperature of 260°C and a temperature limit of 220-240°C for long-term use. Considering that power lithium-ion batteries may experience extreme high temperatures during service, such as the temperature inside the battery may exceed 250°C during thermal runaway, based on such an environment, the insulating part structure in the existing technology will no longer meet the requirements of insulation performance. Therefore, there is an urgent need for a new type of high-heat-resistant battery cell cover plate structure to ensure the high-temperature stability of the terminal assembly insulating part structure. Utility Model Content

[0004] 1. Problems to be solved

[0005] In view of the problem in the prior art that the insulating parts made of PPS material are assembled at the terminals of the battery cover, but stable insulation performance cannot be achieved under high temperature conditions, the utility model provides a high heat-resistant battery cell cover structure, adopts a specific battery terminal structure, designs and simplifies the terminal connection structure, and can ensure the high-temperature stability of the insulating part structure of the terminal assembly.

[0006] 2. Technical solution

[0007] To solve the above problems, the utility model adopts the following technical solutions.

[0008] A high heat-resistant battery cell cover plate structure includes a top cover plate provided with an electrode lead-out hole, and further includes:

[0009] A terminal, located on one side of the top cover plate and covering the electrode lead-out hole;

[0010] A supporting ceramic ring, supported between the terminal and the top cover plate, and at least partially surrounding an end of the terminal close to the top cover plate to limit the movement of the terminal toward the top cover plate;

[0011] A limiting ceramic ring is spaced apart from the supporting ceramic ring and at least partially surrounds an end of the terminal away from the top cover plate to limit the terminal from moving in a direction away from the top cover plate;

[0012] A fixing assembly is connected to the top cover plate and at least partially surrounds the supporting ceramic ring and the limiting ceramic ring to fix the supporting ceramic ring, the limiting ceramic ring and the terminal on the top cover plate.

[0013] The high heat-resistant battery cell cover plate structure of the utility model simplifies and improves the cover plate terminal structure, and adopts a ceramic ring with a special structural design to limit the installation of the pole. The support ceramic ring and the limit ceramic ring arranged at intervals can be conveniently processed and installed, and the supporting performance is improved. At the same time, the insulation performance of the terminal structure connection can be ensured, the sealing performance is improved, and the high-temperature stability of the terminal structure can be ensured.

[0014] Further, the supporting ceramic ring includes a base supported between the top cover plate and the terminal, and a barrel surrounding the terminal. Preferably, the terminal includes a columnar body and a flange facing the top cover plate, and the limiting ceramic ring includes a radial limiting portion surrounding the columnar body and an axial limiting portion surrounding the flange.

[0015] In some possible embodiments, the fixing component includes:

[0016] A limiting member connected to the top cover plate and at least partially surrounding the supporting ceramic ring and the limiting ceramic ring to limit the relative positions of the supporting ceramic ring, the limiting ceramic ring and the terminal on the top cover plate;

[0017] A fixing member is connected to the top cover plate and at least partially surrounds the limiting member to fix the limiting member, the supporting ceramic ring, the limiting ceramic ring and the terminal on the top cover plate.

[0018] Furthermore, the top cover plate is provided with a small-diameter primary groove and a large-diameter secondary groove in sequence on the side facing the terminal, and the supporting ceramic ring is arranged on the bottom of the primary groove. Wherein, the limiting member includes an annular base arranged at the bottom of the primary groove, and an extension portion extending and wrapping the outer peripheral wall of the supporting ceramic ring and the limiting ceramic ring, and the outer peripheral wall of the annular base is connected to the inner side wall of the primary groove by welding. The fixing member is formed by an insulating injection molding process, and has a filling portion filled in the gap between the inner side wall of the secondary groove and the outer peripheral wall of the limiting member. The fixing member extends from its filling portion to wrap the limiting member and the limiting ceramic ring to the outer peripheral wall of the terminal.

[0019] In addition, in order to improve the sealing performance of the pole connection structure, a seal is also provided between the terminal and the top cover plate, and the seal includes a cylindrical portion wrapping the inner wall of the electrode lead-out hole, and an annular portion filled between the terminal and the top cover plate.

[0020] A lithium battery comprises a shell with at least one end open, a battery cell is arranged in the shell, and the shell opening is provided with the above-mentioned high heat-resistant battery cell cover plate structure.

[0021] It will be apparent that elements or features described above in the context of a single embodiment may be used alone or in combination in other embodiments.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] (1) The utility model provides a high heat-resistant battery cell cover plate structure, which simplifies and improves the cover plate terminal structure and adopts a ceramic ring with a special structural design to limit the installation of the pole. The support ceramic ring and the limit ceramic ring arranged at intervals can be easily processed and installed, and the supporting performance can be improved. At the same time, the insulation performance of the terminal structure connection can be ensured, the sealing performance can be improved, and the high-temperature stability of the terminal structure can be ensured.

[0025] (2) The utility model provides a high heat-resistant battery cell cover plate structure, which can fasten the supporting ceramic ring, the limiting ceramic ring and the terminal on the top cover plate by setting the limiting parts and the fixing parts, and set the primary sinking groove and the secondary sinking groove on the top cover plate, which can play a positioning role when installing the terminal and the connecting structural parts, and increase the compactness and stability of the overall battery cover plate structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the drawings, the sizes and proportions do not represent the sizes and proportions of actual products. The drawings are merely illustrative, and some non-essential elements or features are omitted for clarity.

[0027] Figure 1 This is a schematic structural diagram of the terminal connection portion of the high heat-resistant battery cell cover structure in Example 1;

[0028] Figure 2 A three-dimensional diagram of the high heat-resistant battery cell cover structure of Example 1;

[0029] Figure 3 This is a schematic structural diagram of the high heat-resistant battery cell cover plate structure of Example 1 observed from above.

[0030] Description of Reference Numerals

[0031] 1. Top cover plate; 101. Electrode lead-out hole; 102. Primary sink groove; 103. Secondary sink groove; 2. Terminal; 201. Columnar body; 202. Flange; 3. Support ceramic ring; 301. Base; 302. Cylinder; 4. Limiting ceramic ring; 401. Radial limiting part; 402. Axial limiting part; 5. Limiting member; 501. Annular base; 502. Extension part; 6. Fixing member; 7. Sealing member; 701. Cylinder; 702. Annular part. DETAILED DESCRIPTION

[0032] The present invention will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0033] Example 1

[0034] This embodiment provides a high heat-resistant battery cell cover plate structure, which is mainly used in secondary batteries, especially lithium batteries. The high heat-resistant battery cell cover plate structure can be assembled at the opening of the battery shell, and is suitable for batteries with one end opening as well as batteries with two ends opening.

[0035] like Figure 1-3 As shown, the high heat-resistant battery cell cover plate structure mainly includes a top cover plate 1, a terminal 2 installed on the cover plate, and a connection structure between the two.

[0036] An electrode lead-out hole 101 is provided on the top cover plate 1, and a terminal 2 is arranged on one side of the top cover plate 1, and the terminal 2 covers the electrode lead-out hole 101. Specifically, one electrode lead-out hole 101 can be provided on the top cover plate 1 to install the positive terminal 2 or the negative terminal 2, that is, the positive and negative terminals 2 are located at opposite ends of the battery, and two electrode lead-out holes 101 can also be provided on the top cover plate 1 to install the positive terminal 2 and the negative terminal 2, that is, the positive and negative terminals 2 are located at the same end of the battery.

[0037] In order to ensure the insulation between the terminal 2 and the top cover plate 1, an insulating member made of PPS material is installed on the outside of the terminal 2 in the prior art. However, during the use of the battery, thermal runaway and other situations may occur, resulting in excessive temperature inside the battery. In this environment, the insulating member is heated and can no longer meet the insulation performance requirements.

[0038] To this end, in this embodiment, a supporting ceramic ring 3 is provided between the terminal 2 and the top cover plate 1. The supporting ceramic ring 3 supports the terminal 2 and at least partially surrounds one end of the terminal 2 close to the top cover plate 1 to limit the movement of the terminal 2 toward the top cover plate 1, wherein the ring of ceramic material adopts high-temperature ceramic material, which has good stability and is not easy to melt in a high-temperature environment, and has the characteristics of good insulation, high strength, and high hardness. Specifically, the supporting ceramic ring 3 includes a base 301 supported between the top cover plate 1 and the terminal 2, and a barrel 302 surrounding the side of the terminal 2. It should be noted that the wrapping or surrounding here and below can wrap the whole or part of the wrapped part according to actual conditions.

[0039] In addition, a limiting ceramic ring 4 is arranged outside the terminal 2 and is spaced apart from the supporting ceramic ring 3, which at least partially surrounds the end of the terminal 2 away from the top cover plate 1, thereby limiting the movement of the terminal 2 in the direction away from the top cover plate 1. The cooperation between the limiting ceramic ring 4 and the supporting ceramic ring 3 can better achieve its insulation performance, and can still ensure the insulation effect under high temperature conditions. In addition, the supporting ceramic ring 3 and the limiting ceramic ring 4 are arranged separately, which can facilitate the processing and installation of the two, and leaving a gap between the two can also improve their supporting performance.

[0040] In some possible embodiments, the terminal 2 includes a connected columnar body 201 and a flange portion 202 facing the top cover plate 1. At the same time, the limiting ceramic ring 4 includes a radial limiting portion 401 surrounding the circumference of the columnar body 201 to limit the movement of the terminal 2 in its radial direction. The limiting ceramic ring 4 also includes an axial limiting portion 402 surrounding the flange portion 202 to limit the movement of the terminal 2 in its axial direction. In some possible embodiments, the outer dimensions of the limiting ceramic ring 4 and the supporting ceramic ring 3 may be consistent or inconsistent.

[0041] In order to fix the supporting ceramic ring 3, the limiting ceramic ring 4 and the terminal 2 on the top cover plate 1, the present embodiment also includes a fixing component connected to the top cover plate 1, which at least partially surrounds the supporting ceramic ring 3 and the limiting ceramic ring 4, so that the supporting ceramic ring 3, the limiting ceramic ring 4 and the terminal 2 can be fixed on the top cover plate 1.

[0042] In some possible embodiments, the fixing assembly may include a limiter 5 and a fixing member 6. The limiter 5 may be connected to the top cover plate 1 by laser welding or the like, and at least partially surround the supporting ceramic ring 3 and the limiter ceramic ring 4 to limit the relative positions of the supporting ceramic ring 3, the limiter ceramic ring 4 and the terminal 2 on the top cover plate 1.

[0043] In order to better position and install the fixed components, the supporting ceramic ring 3, the limiting ceramic ring 4 and the terminal 2, in some possible embodiments, a small-diameter primary groove 102 and a large-diameter secondary groove 103 are sequentially provided on the side of the top cover plate 1 facing the terminal 2, that is, the diameter of the primary groove 102 is smaller than that of the secondary groove 103, and the supporting ceramic ring 3 is arranged on the bottom of the primary groove 102.

[0044] The limiting member 5 includes an annular base 501 arranged at the bottom of the primary trough 102, and an extension portion 502 extending and wrapping the outer peripheral wall of the supporting ceramic ring 3 and the limiting ceramic ring 4. The outer peripheral wall of the annular base 501 is connected to the inner wall of the primary trough 102 by welding. The fixing member 6 is formed by an insulating injection molding process, and has a filling portion filled in the gap between the inner wall of the secondary trough 103 and the outer peripheral wall of the limiting member 5. The fixing member 6 extends from its filling portion to wrap the limiting member 5 and the limiting ceramic ring 4 to the outer peripheral wall of the terminal 2. In this way, it can play a positioning role when installing the terminal 2 and the connecting structural parts, and increase the compactness and stability of the overall battery cover structure. In addition, the limiting member 5 can be made of high-strength metal materials such as aluminum alloy and steel. The raw materials of this material are easy to obtain and low in price. At the same time, the welding difficulty is small and the welding quality is high.

[0045] In addition, in order to improve the sealing performance of the pole or terminal 2 connection structure, a seal 7 is also provided between the terminal 2 and the top cover plate 1, and the seal 7 includes a cylindrical portion 701 that wraps the inner wall of the electrode lead-out hole 101, and an annular portion 702 that fills the space between the terminal 2 and the top cover plate 1. In addition, the seal 7 can be a gasket structure, using an elastic material with good compressibility, which can be compressed to ensure air tightness, wherein the compression amount of the gasket can also be ensured by buckling the limiter 5 and welding one end to the top cover plate 1, and the terminal 2 has good sealing performance.

[0046] Example 2

[0047] This embodiment provides a lithium battery, which is mainly used in new energy power battery modules. Multiple lithium batteries can form a large power battery module to provide power for new energy vehicles and other equipment.

[0048] The lithium battery mainly comprises a shell with at least one end open, a battery cell is arranged in the shell, the high heat-resistant battery cell cover structure in Example 1 is arranged at the shell opening, and the connecting piece at the end of the battery cell is electrically connected to the pole to lead out the current.

[0049] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "top", "bottom", "inside" and "outside" are based on the directions 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 device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and that the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A high heat-resistant battery cell cover plate structure, comprising a top cover plate (1) provided with an electrode lead-out hole (101), characterized in that: Also includes: A terminal (2), located on one side of the top cover plate (1) and covering the electrode lead-out hole (101); A supporting ceramic ring (3), supported between the terminal (2) and the top cover plate (1), and at least partially surrounding an end of the terminal (2) close to the top cover plate (1), so as to limit the movement of the terminal (2) toward the top cover plate (1); a limiting ceramic ring (4), which is spaced apart from the supporting ceramic ring (3) and at least partially surrounds an end of the terminal (2) away from the top cover plate (1) to limit movement of the terminal (2) in a direction away from the top cover plate (1); A fixing component is connected to the top cover plate (1) and at least partially surrounds the supporting ceramic ring (3) and the limiting ceramic ring (4) so ​​as to fix the supporting ceramic ring (3), the limiting ceramic ring (4) and the terminal (2) on the top cover plate (1).

2. The high heat-resistant battery cell cover structure according to claim 1, characterized in that: The supporting ceramic ring (3) comprises a base (301) supported between the top cover plate (1) and the terminal (2), and a barrel (302) surrounding the terminal (2).

3. The high heat-resistant battery cell cover structure according to claim 1, characterized in that: The terminal (2) comprises a columnar body (201) and a flange portion (202) facing the top cover plate (1), and the limiting ceramic ring (4) comprises a radial limiting portion (401) surrounding the circumference of the columnar body (201) and an axial limiting portion (402) surrounding the flange portion (202).

4. The high heat-resistant battery cell cover structure according to claim 1, characterized in that: The fixing assembly comprises: a limiting member (5), the limiting member (5) being connected to the top cover plate (1) and at least partially surrounding the supporting ceramic ring (3) and the limiting ceramic ring (4) so ​​as to limit the relative positions of the supporting ceramic ring (3), the limiting ceramic ring (4) and the terminal (2) on the top cover plate (1); A fixing member (6) connected to the top cover plate (1) and at least partially surrounding the limiting member (5) so as to fix the limiting member (5), the supporting ceramic ring (3), the limiting ceramic ring (4) and the terminal (2) on the top cover plate (1).

5. The high heat-resistant battery cell cover structure according to claim 4, characterized in that: A primary sink groove (102) with a small diameter and a secondary sink groove (103) with a large diameter are sequentially provided on the side of the top cover plate (1) facing the terminal (2), and the supporting ceramic ring (3) is arranged on the bottom of the primary sink groove (102).

6. The high heat-resistant battery cell cover plate structure according to claim 5, characterized in that: The limiting member (5) comprises an annular base (501) arranged at the bottom of the primary trough (102), and an extension portion (502) extending and wrapping around the outer peripheral walls of the supporting ceramic ring (3) and the limiting ceramic ring (4); the outer peripheral wall of the annular base (501) is connected to the inner side wall of the primary trough (102) by welding.

7. The high heat-resistant battery cell cover structure according to claim 5, characterized in that: The fixing member (6) is formed by an insulating injection molding process, and has a filling portion that fills the gap between the inner wall of the secondary sink (103) and the outer peripheral wall of the limiting member (5).

8. The high heat-resistant battery cell cover structure according to claim 7, characterized in that: The fixing member (6) extends from its filling portion to wrap around the limiting member (5) and the limiting ceramic ring (4) to the outer peripheral wall of the terminal (2).

9. The high heat-resistant battery cell cover structure according to any one of claims 1 to 8, characterized in that: A sealing member (7) is also provided between the terminal (2) and the top cover plate (1), and the sealing member (7) comprises a cylindrical portion (701) wrapping the inner wall of the electrode lead-out hole (101), and an annular portion (702) filling between the terminal (2) and the top cover plate (1).

10. A lithium battery, comprising a shell with at least one end open, wherein a battery cell is arranged in the shell, characterized in that: The shell opening is provided with a high heat-resistant battery cell cover structure as claimed in any one of claims 1 to 9.

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