Nanometer injection molding cover plate structure of power battery

Abstract

The utility model discloses a kind of power battery nanometer injection molding cover plate structures, belong to power battery field. Including pole and light aluminum sheet, the pole and light aluminum sheet are fixedly connected between through connecting piece, the connecting piece is integrally fixed with pole, light aluminum sheet injection molding combination;In the present device, after pole and light aluminum sheet processing are completed, both are placed into mould, then connecting piece is formed between the both by injection molding mode, and then pole and light aluminum sheet are fixed to form an integrated whole. Utilize injection molding process to replace existing welding fixed mode, solve the quality defect problems of existing technology, such as the cover plate appears air leak or mechanical strength is relatively low due to welding fixation. Meanwhile, connecting piece can replace sealing ring to play sealing effect, so that the use of cover plate structure cancels sealing pad. Finally, the cost of entire product can be further reduced.

Description

Technical Field

[0001] This utility model relates to the field of power batteries, and in particular to a nano-injection molded cover structure for power batteries. Background Technology

[0002] Nano-injection molded covers for power batteries are high-performance battery encapsulation components that combine metal inserts (such as aluminum or aluminum alloy terminals) with engineering plastics. They utilize nano-injection molding technology (NMT) to firmly integrate the metal and plastic through a microscopic physical bonding process. The core process involves first performing nanoscale etching or T-treatment (such as anodizing or micro-arc oxidation) on the metal surface to create a porous structure that enhances the penetration and anchoring effect of the plastic (such as PA6, PPS, etc.). Then, high-temperature, high-pressure injection molding is used to form a high-strength integrated structure between the plastic and metal. These covers offer advantages such as lightweight design, high sealing performance, resistance to electrolyte corrosion, excellent insulation properties, and shock resistance. They are widely used in power battery modules for new energy vehicles, effectively improving the safety and energy density of battery systems while reducing production costs. This represents a significant technological development direction in the field of power battery structural components.

[0003] Currently, traditional battery nano-injection molded covers are typically made into terminal structures, which are then welded to and fixed to a sheet of aluminum. Due to the welding process and the heat involved, injection molding can lead to over-melting, reducing the bonding strength and causing problems such as air leakage, decreased mechanical strength, and in severe cases, even detachment of the terminals. Similarly, poor welding quality can also cause air leakage in the cover. Utility Model Content

[0004] This invention provides a nano-injection molded cover structure for power batteries, which can solve the quality defects of existing power battery injection molded covers, such as air leakage or low mechanical strength caused by welding.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A nano-injection molded cover structure for a power battery includes an electrode post and a light aluminum sheet. The electrode post and the light aluminum sheet are fixedly connected by a connector. The connector is injection molded and fixed to the electrode post and the light aluminum sheet into a whole.

[0007] The inner wall of the connector is provided with a first connecting groove, and the outer wall of the pole post protrudes to form a first connecting part;

[0008] The outer wall of the connector is provided with a second connecting groove, and the aluminum sheet is provided with a second connecting part corresponding to the second connecting groove.

[0009] In one embodiment of this utility model: the electrode post includes a positive electrode post and a negative electrode post, wherein the positive electrode post is made of pure aluminum and the negative electrode post is made of copper-aluminum composite alloy.

[0010] In one embodiment of this utility model, the connector is made of PPS material.

[0011] In one embodiment of this utility model: the connector is externally fixedly connected to a support portion.

[0012] In one embodiment of this utility model, there is a height difference between the bottom of the support portion and the bottom of the connector.

[0013] In one embodiment of this utility model, the outer side of the support portion is inclined.

[0014] In one embodiment of this utility model: a first slot is provided on one side of the aluminum sheet near the support portion, and a first locking block corresponding to the first slot is formed by an outward protrusion on the support portion.

[0015] In one embodiment of this utility model: the first card block is an annular structure arranged around the connector.

[0016] In one embodiment of this utility model: a second slot is provided on one side of the support near the aluminum sheet, and a second locking block protrudes outward on the aluminum sheet to cooperate with the second slot.

[0017] In one embodiment of this utility model: the support portion protrudes outward on the side near the aluminum sheet to form a first locking block, and a second locking groove is formed between the first locking block and the outer wall of the connector. A second locking block for cooperating with the second locking groove is fixedly provided on the aluminum sheet.

[0018] The nano-injection molded cover plate structure for a power battery according to this utility model has at least one of the following technical effects:

[0019] In this device, after the electrode post and the aluminum sheet are processed, they are placed in a mold, and then a connector is formed between them by injection molding, thus fixing the electrode post and the aluminum sheet into a single unit. The inner side of the formed connector has a first connecting groove for mating with the first connecting part on the electrode post; the outer side of the connector has a second connecting groove for mating with the second connecting part on the aluminum sheet, effectively ensuring the stability and connection strength of the overall structure. Using injection molding to replace the existing welding method solves the quality defects in the existing technology, such as air leakage or low mechanical strength of the cover plate caused by welding. At the same time, the connector can replace the sealing ring for sealing, eliminating the need for a sealing gasket in the cover plate structure. Ultimately, the cost of the entire product can be further reduced (saving 0.4-1 yuan per cover plate). Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood in conjunction with the following description of the embodiments with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Wherein:

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This utility model Figure 1 A schematic diagram of the structure in the front view;

[0023] Figure 3 This utility model Figure 1 A structural schematic diagram of the mid-rear view;

[0024] Figure 4 This utility model Figure 2 Schematic diagram of the structure of section AA in the middle;

[0025] Figure 5 This is an enlarged structural diagram of the negative electrode post position of this utility model;

[0026] Figure 6 This is a three-dimensional structural diagram of the positive electrode post connection component of this utility model;

[0027] Figure 7 This is a cross-sectional structural diagram of the connector of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Pole post; 2. Aluminum sheet; 3. Connector; 4. Plastic part; 5. Support part. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] Existing battery covers are typically made into terminal structures, with the terminals welded to the aluminum sheet 2. The welding process and the heat generated during welding can lead to a series of quality problems with the cover. For example, welding can cause injection molding to melt, reducing the injection molding bond strength, resulting in air leakage, reduced mechanical strength, and in severe cases, even loosening of the terminal post 1. Similarly, poor welding quality can also cause air leakage. To address these issues, this application provides a nano-injection molded cover structure for power batteries. This structure changes the traditional terminal structure by directly injection molding the aluminum sheet 2 and the terminal post 1, forming a connector 3 between them to securely connect them. This eliminates the terminal welding process, freeing the cover from the effects of welding and preventing air leakage and reduced mechanical strength. Furthermore, the connector 3 can replace the existing sealing ring for sealing, thus reducing the overall production cost of the cover (saving 0.4-1 yuan per cover).

[0032] like Figure 1-7 As shown in the figure, the present invention provides a nano-injection molded cover structure for a power battery, including an electrode post 1 and an aluminum sheet 2. The electrode post 1 and the aluminum sheet 2 are fixedly connected by a connector 3. The connector 3 is injection molded and fixed to the electrode post 1 and the aluminum sheet 2 into one piece. A first connecting groove is provided on the inner wall of the connector 3, and a first connecting part is formed by protrusion on the outer wall of the electrode post 1. A second connecting groove is provided on the outer wall of the connector 3, and a second connecting part corresponding to the second connecting groove is provided on the aluminum sheet 2.

[0033] In this device, after the electrode post 1 and the aluminum sheet 2 are processed, they are placed in a mold, and then a connector 3 is formed between them by injection molding, thereby fixing the electrode post 1 and the aluminum sheet 2 into a single unit. The inner side of the formed connector 3 forms a first connecting groove for mating with the first connecting part on the electrode post 1; the outer side of the connector 3 forms a second connecting groove for mating with the second connecting part on the aluminum sheet 2, effectively ensuring the stability and connection strength of the overall structure. Using injection molding to replace the existing welding fixing method solves the quality defects in the existing technology, such as air leakage or low mechanical strength of the cover plate caused by welding fixing. At the same time, the connector 3 can replace the sealing ring to provide a sealing function, eliminating the need for a sealing gasket in the cover plate structure. Ultimately, the cost of the entire product can be further reduced (saving 0.4-1 yuan per cover plate).

[0034] Please see Figure 1-7 In one embodiment of this utility model, the electrode post 1 includes a positive electrode post 1 and a negative electrode post 1, wherein the positive electrode post 1 is made of pure aluminum and the negative electrode post 1 is made of copper-aluminum composite alloy.

[0035] Please see Figure 1-7In one embodiment of this utility model, the connector 3 can be made of PPS (polyphenylene sulfide), and the connector 3 made therefrom has advantages such as high temperature resistance, chemical corrosion resistance, high mechanical strength and excellent dimensional stability.

[0036] Please see Figure 1-7 In one embodiment of this utility model, a support portion 5 can be fixedly connected to the outside of the connector 3. The support portion 5 is used to cooperate with the bottom of the aluminum sheet 2 to improve the connection strength. There is a height difference between the bottom of the support portion 5 and the bottom of the connector 3. The outer side of the support portion 5 can be inclined for subsequent cooperation with the plastic part 4 located at the bottom of the cover plate.

[0037] Please see Figure 1-7 In one embodiment of this utility model, to further improve the stability and connection strength of the connection between the pole post 1 and the aluminum sheet 2 via the connector 3, a first slot may be formed on one side of the aluminum sheet 2 near the support portion 5, and a first locking block corresponding to the first slot may protrude outward on the support portion 5, the first locking block engaging with the first slot. The first locking block may be a block structure or a ring structure surrounding the connector 3. The first slot corresponds to the first locking block. As another example, a second slot may be formed on one side of the support portion 5 near the aluminum sheet 2, and a second locking block may protrude outward on the aluminum sheet 2 to engage with the second slot. The engagement of the second slot with the second locking block improves connection stability. As a further and preferred example, a first locking block protrudes outward on one side of the support portion 5 near the aluminum sheet 2, a first slot for engaging with the first locking block is formed on the bottom surface of the aluminum sheet 2, a second slot is formed between the first locking block and the outer wall of the connector 3, and a second locking block for engaging with the second slot is fixedly provided on the aluminum sheet 2. The first and second card blocks are arranged adjacently to form an interlocking structure (e.g. Figure 5 This effectively ensures the stability of the connection between the support part 5 and the aluminum sheet 2.

[0038] The working principle of this utility model:

[0039] First, the aluminum sheet 2 and the electrode post 1 are formed by stamping / machining. Then, the aluminum sheet 2 and the electrode post 1 are surface-treated to improve their surface roughness, thereby enhancing the bonding force with the injection molded part after injection molding. The surface-treated aluminum sheet 2 and the electrode post 1 are placed in the injection mold, and the connector 3 is formed by injection molding, thus fixing the aluminum sheet 2 and the electrode post 1 together to form a whole. Then, an insulating plastic part 4 is assembled to provide insulation. Specifically, the surface treatment of the aluminum sheet 2 and the electrode post 1 can be nano-level etching or T-treatment (such as anodizing or micro-arc oxidation). The T-treatment involves using chemical agents to corrode the surface of the part, creating numerous nano-sized pores and improving the surface roughness to increase the bonding force with the injection molded part. The injection mold can be selected according to the actual situation, which will not be elaborated here.

[0040] The foregoing has provided a detailed description of one embodiment of the present invention, but the description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the scope of the claims of the present invention.

[0041] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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 this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A nano-injection molded cover structure for a power battery, comprising an electrode post and a light aluminum sheet, characterized in that, The electrode post and the aluminum sheet are fixedly connected by a connector, and the connector is injection molded and fixed to the electrode post and the aluminum sheet as a whole. The inner wall of the connector is provided with a first connecting groove, and the outer wall of the pole post protrudes to form a first connecting part; The outer wall of the connector is provided with a second connecting groove, and the aluminum sheet is provided with a second connecting part corresponding to the second connecting groove.

2. The nano-injection molded cover structure for a power battery according to claim 1, characterized in that, The electrode includes a positive electrode and a negative electrode. The positive electrode is made of pure aluminum, and the negative electrode is made of a copper-aluminum composite alloy.

3. The nano-injection molded cover structure for a power battery according to claim 1, characterized in that, The connector is made of PPS material.

4. The nano-injection molded cover structure for a power battery according to claim 1, characterized in that, The connector is externally fixedly connected to a support.

5. The nano-injection molded cover structure for a power battery according to claim 4, characterized in that, There is a height difference between the bottom of the support and the bottom of the connector.

6. The nano-injection molded cover structure for a power battery according to claim 5, characterized in that, The outer side of the support is inclined.

7. The nano-injection molded cover structure for a power battery according to claim 4, characterized in that, The aluminum sheet has a first slot on one side near the support, and a first block protrudes outward from the support to form a corresponding slot.

8. The nano-injection molded cover structure for a power battery according to claim 7, characterized in that, The first card block is a ring structure arranged around the connector.

9. The nano-injection molded cover structure for a power battery according to claim 4, characterized in that, The support portion has a second slot on one side near the aluminum sheet, and a second locking block protrudes outward on the aluminum sheet to engage with the second slot.

10. The nano-injection molded cover structure for a power battery according to claim 4, characterized in that, The support portion protrudes outward on the side near the aluminum sheet to form a first locking block. The aluminum sheet is provided with a first locking groove for engaging the first locking block. A second locking groove is formed between the first locking block and the outer wall of the connector. A second locking block for engaging the second locking groove is fixedly provided on the aluminum sheet.

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