Novel battery cover plate structure

Abstract

The utility model discloses a novel battery cover plate structure which comprises a base plate, two through holes are formed in the base plate and are respectively used for installing a positive pole assembly and a negative pole assembly, the positive pole assembly and the negative pole assembly are the same in structure and respectively comprise a pressing plate, an insulating plate, a sealing ring and a pole, an annular groove is formed in the sealing ring, and the insulating plate is arranged in the annular groove. The annular groove is clamped at the through hole; the pole sequentially penetrates through the sealing ring and the insulating plate and then is clamped on the insulating plate; according to the utility model, the annular groove is arranged on the sealing ring, so that the sealing ring can be clamped at the position of the through hole for mounting the pole, the insulating plate directly crimps the upper surface of the sealing ring instead of arranging a groove matched with the sealing ring on the insulating plate, and a slotting structure is reduced; the problem of electrolyte crystallization and insulation failure caused by the fact that electrolyte enters gaps between the aluminum plate and the insulating part can be well solved, the electrolyte leakage risk of the battery is reduced, and the use performance of the battery is improved.

Description

Technical Field

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

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] With the rapid development of new energy, power batteries are increasingly widely used. Lithium batteries have relatively mature technology and are a hot topic in current power battery research. As one of the structural parts of the battery cell, the cover assembly mainly seals the pole group and leads the positive and negative poles. The cover assembly includes riveting blocks, insulating parts, cover plates, poles, sealing rings, etc. The sealing ring is located between the pole and the plastic part and mainly plays a sealing role. The sealing rings in the existing battery cover assemblies are usually sealed with step-shaped sealing rings. For example, Chinese utility model patent CN220544066U discloses a cylindrical battery cover structure in which a step-shaped sealing ring is used for sealing. For this sealing structure, the electrolyte may leak out and enter the middle of the cover through the gap in the plastic part. The electrolyte crystallizes and causes the insulation of the cover to fail. In addition, there are multiple sealing rings arranged on the battery cover assembly. For example, Chinese utility model patent CN207074669U discloses a battery cover, which is sealed by a first sealing ring and a second sealing ring. However, this structure increases the number of cover assemblies and increases the difficulty of assembly. In addition, an additional annular groove needs to be arranged on the pole for installing the sealing ring, which makes the pole processing difficult and limits the cross-sectional area of ​​the positive and negative poles, which is not conducive to improving the current capacity of the battery module. Utility Model Content

[0004] The utility model aims to provide a novel battery cover plate structure, which can achieve a better sealing effect on the cover plate assembly and avoid grooving on the pole when installing the sealing ring, thereby affecting the current carrying capacity of the battery module.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] In the first aspect, an embodiment of the utility model provides a new type of battery cover structure, including a substrate, wherein two through holes are provided on the substrate, respectively used to install a positive electrode column assembly and a negative electrode column assembly, wherein the positive electrode column assembly and the negative electrode column assembly have the same structure, both including a pressure plate, an insulating plate, a sealing ring and a pole, wherein an annular groove is provided on the sealing ring, and the annular groove is engaged in the through hole; after the pole passes through the sealing ring and the insulating plate in sequence, it is engaged in the insulating plate.

[0007] As a further technical solution, the upper surface of the sealing ring is 1-2 mm higher than the upper surface of the through hole, and the lower surface of the insulating plate is crimped to the upper surface of the sealing ring.

[0008] As a further technical solution, the height of the annular groove is smaller than the height of the through hole, and the lower surface of the sealing ring is lower than the lower surface of the through hole.

[0009] As a further technical solution, an annular groove is provided on the lower surface of the through hole position, and the annular groove at the through hole position engages with a portion of the sealing ring.

[0010] As a further technical solution, the lower surface of the sealing ring is crimped to the pole.

[0011] As a further technical solution, an annular groove is provided at the upper end of the pole, and the annular groove is engaged with the annular protrusion on the pressure plate.

[0012] As a further technical solution, a rectangular groove is provided at the position of the through hole of the substrate, and the rectangular groove is used for installing the insulating plate.

[0013] As a further technical solution, a rectangular groove is provided on the insulating plate, and the rectangular groove is used for installing the pressing plate.

[0014] As a further technical solution, a liquid injection hole and an explosion-proof valve are also provided on the substrate.

[0015] As a further technical solution, the sealing ring and the through hole are interference fit.

[0016] The beneficial effects of the above-mentioned embodiments of the utility model are as follows:

[0017] The novel battery cover plate structure provided by the utility model provides an annular groove on the sealing ring so that the sealing ring can be engaged in the through-hole position of the pole installation. The insulating plate is directly crimped to the upper surface of the sealing ring instead of providing a groove matching the sealing ring on the insulating plate, thereby reducing the slotted structure. Compared with the existing step-type sealing ring, it can well solve the problem of electrolyte entering the gap between the aluminum plate and the insulating part, resulting in electrolyte crystallization and insulation failure, reduce the risk of battery leakage, and improve the performance of the battery.

[0018] The novel battery cover plate structure provided by the utility model, by arranging an annular groove at the position of the through hole on the base plate to cooperate with the sealing ring, compared with the existing arrangement of two or more sealing rings, there is no need to arrange an annular groove on the pole, thereby avoiding affecting the current capacity of the battery module.

[0019] The novel battery cover plate structure provided by the utility model can well ensure the sealing of the cover plate through the interference fit between the sealing ring and the through hole on the base plate. At the same time, the use of the sealing ring and the groove provided for installing the sealing ring are reduced, thereby reducing the difficulty of processing various components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of the novel battery cover structure of the utility model;

[0022] Figure 2 It is a partially disassembled schematic diagram of the novel battery cover structure of the utility model;

[0023] Figure 3 It is a partial cross-sectional view of the novel battery cover structure of the utility model.

[0024] The schematic diagram is for illustrative purposes only;

[0025] Among them, 1. pressure plate; 2. insulating plate; 3. sealing ring; 4. base plate; 5. injection hole; 6. pole; 7. explosion-proof valve. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0027] Example 1

[0028] In a typical implementation of the present invention, Figure 1-3 As shown, a new type of battery cover structure is provided, including a substrate 4, on which two through holes are provided, respectively used to install a positive pole assembly and a negative pole assembly, the positive pole assembly and the negative pole assembly have the same structure, both including a pressing plate 1, an insulating plate 2, a sealing ring 3 and a pole 6, the sealing ring 3 is provided with an annular groove, and the annular groove is engaged at the through hole; the pole 6 passes through the sealing ring 3 and the insulating plate 2 in sequence and is engaged on the insulating plate 2.

[0029] In this embodiment, the upper surface of the sealing ring 3 is 1-2mm higher than the upper surface of the through hole, the lower surface of the insulating plate is pressed against the upper surface of the sealing ring, the height of the annular groove is less than the height of the through hole, and the lower surface of the sealing ring is lower than the lower surface of the through hole. The sealing ring 3 is an I-shaped structure, but the sealing ring of the I-shaped structure is not a symmetrical structure, that is, the thickness of the sealing gasket above the annular groove is less than the thickness of the sealing gasket below the annular groove. The thickness of the sealing gasket above the annular groove is only 1-2mm, which can be tightly pressed against the upper surface of the sealing ring through the insulating plate to prevent the electrolyte from entering the gap between the insulating plate and the substrate, thereby improving the sealing effect. The thickness of the sealing gasket above the annular groove should not be set too thick to avoid the insulation plate and the substrate not being able to fit tightly.

[0030] In this embodiment, the thickness of the sealing gasket on the annular groove is 4-6 mm, which can improve the overall strength of the sealing gasket and enable the sealing gasket to be better engaged in the through groove and not easily fall off.

[0031] In this embodiment, an annular groove is provided on the lower surface of the through hole position, and the annular groove at the through hole position engages part of the sealing ring. The lower surface of the sealing ring is lower than the lower surface of the through hole position, so that the lower surface of the sealing ring is tightly pressed against the pole.

[0032] In this embodiment, an annular groove is provided at the upper end of the pole 3, and the annular groove is engaged with the annular protrusion on the pressure plate 1. Only one annular groove is provided on the pole, and there is no need to provide an additional annular groove to engage the sealing ring. This not only reduces the processing difficulty of the pole, but also does not cause much impact on the cross-sectional area of ​​the positive and negative poles, thereby avoiding affecting the overcurrent capacity of the battery module.

[0033] In this embodiment, a rectangular groove is provided at the through hole position of the substrate 4, and the rectangular groove is used to install the insulating plate 2. Furthermore, a rectangular groove is provided on the insulating plate 2, and the rectangular groove is used to install the pressing plate 2. The adjacent substrates 4, insulating plates 2 and pressing plates 1 are limited by the rectangular grooves, thereby improving the positioning accuracy of each component and the convenience of installation.

[0034] In this embodiment, the substrate is further provided with an injection hole 5 and an explosion-proof valve 7. The injection hole is used to inject electrolyte into the battery. An explosion-proof plate is installed in the explosion-proof valve 7. When an internal fault occurs in the battery, the explosion-proof plate pops out of the explosion-proof valve to release the internal air pressure of the battery, thereby avoiding battery explosion and ensuring the safety of battery use.

[0035] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A new battery cover structure, characterized in that: It includes a substrate, which is provided with two through holes, which are respectively used to install a positive pole assembly and a negative pole assembly. The positive pole assembly and the negative pole assembly have the same structure, both including a pressing plate, an insulating plate, a sealing ring and a pole. The sealing ring is provided with an annular groove, which is engaged with the through hole; the pole passes through the sealing ring and the insulating plate in sequence and is engaged with the insulating plate.

2. The novel battery cover structure as claimed in claim 1, characterized in that: The upper surface of the sealing ring is 1-2 mm higher than the upper surface of the through hole, and the lower surface of the insulating plate is crimped to the upper surface of the sealing ring.

3. The novel battery cover structure as claimed in claim 1, characterized in that: The height of the annular groove is smaller than the height of the through hole, and the lower surface of the sealing ring is lower than the lower surface of the through hole.

4. The novel battery cover structure as claimed in claim 3, characterized in that: An annular groove is arranged on the lower surface of the through hole, and a portion of the sealing ring is engaged with the annular groove at the through hole.

5. The novel battery cover structure as claimed in claim 1, characterized in that: The lower surface of the sealing ring is crimped to the pole.

6. The novel battery cover structure as claimed in claim 1, characterized in that: An annular groove is arranged at the upper end of the pole, and the annular groove is engaged with the annular protrusion on the pressing plate.

7. The novel battery cover structure as claimed in claim 1, characterized in that: A rectangular groove is arranged at the through hole position of the substrate, and the rectangular groove is used for installing the insulating plate.

8. The novel battery cover structure as claimed in claim 1, characterized in that: The insulating plate is provided with a rectangular groove, and the rectangular groove is used for installing the pressing plate.

9. The novel battery cover structure as claimed in claim 1, characterized in that: The base plate is also provided with a liquid injection hole and an explosion-proof valve.

10. The novel battery cover structure as claimed in claim 1, characterized in that: The sealing ring and the through hole are interference fit.

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