Top cover structure and battery

Abstract

The utility model relates to a top cover structure and a battery, and relates to the field of batteries. The top cover structure provided by the utility model comprises a top cover body, lower plastic cement and a pole, a first pole hole is formed in the top cover body, and the surface of the top cover body is coated with an anti-corrosion coating; the lower plastic is arranged on one side of the top cover body, and a second pole hole is formed in the lower plastic; the pole is sleeved with a sealing piece and penetrates through the second pole hole and the first pole hole, one end of the sealing piece is used for sealing the first pole hole, and the other end of the sealing piece is used for sealing the second pole hole. The sealing piece is arranged on the pole in a sleeving mode, the first pole hole and the second pole hole are sealed at the same time, and electrolyte is prevented from overflowing to corrode the top cover body; and the surface of the top cover body is coated with the anti-corrosion coating, so that the corrosion of the overflowing electrolyte to the aluminum top cover body is effectively prevented.

Description

Technical Field

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

[0002] During the preparation process of existing large-capacity square aluminum shell batteries, more electrolyte is often required to meet the cycle performance and rate performance of the battery cell. In this case, the electrolyte often overflows after the battery is filled or negative pressure formed; and the electrolyte overflowing to the top cover structure is likely to cause corrosion of the top cover structure, leaving obvious marks on the top cover structure.

[0003] The inventors found that the pilot line uses the operator to wipe the excess electrolyte, but this is often not handled in time. In addition, even after the top cover structure is wiped by the operator, there will be slight marks of residual electrolyte. This method not only takes up production time, but also has the problem of poor appearance of the battery cell, resulting in unnecessary waste in the production process. Utility Model Content

[0004] The utility model aims to provide a top cover structure and a battery, which can effectively prevent the corrosion of the aluminum top cover body caused by the overflowing electrolyte.

[0005] The embodiment of the utility model is achieved as follows:

[0006] On the one hand, the utility model proposes a top cover structure, including a top cover body, a lower plastic and a pole: a first pole hole is arranged on the top cover body, and a surface of the top cover body is coated with an anti-corrosion coating; the lower plastic is arranged on one side of the top cover body, and a second pole hole is arranged on the lower plastic; a sealing member is sleeved on the pole and passes through the second pole hole and the first pole hole, one end of the sealing member is used to seal the first pole hole, and the other end is used to seal the second pole hole.

[0007] Optionally, the anti-corrosion coating has a thickness of 1-5 μm.

[0008] Optionally, the anti-corrosion coating includes at least one of a polytetrafluoroethylene coating, an acrylic material coating, a PET coating or a PC plastic coating.

[0009] Optionally, the sealing member comprises an upper plastic and a sealing ring, and the sealing ring and the upper plastic are sleeved with the pole in sequence;

[0010] The upper plastic is clamped with the pole and presses the sealing ring and the lower plastic tightly, and the outer wall of the upper plastic is tightly attached to the inner wall of the first pole hole.

[0011] Optionally, a clamping protrusion is provided on the pole;

[0012] The inner ring of the upper plastic is provided with a clamping groove which is engaged with the clamping protrusion.

[0013] Optionally, the top cover body is further provided with a first liquid injection hole and a first mounting port;

[0014] The lower plastic is provided with a second liquid injection hole corresponding to the first liquid injection hole and a second mounting opening corresponding to the first mounting opening.

[0015] Optionally, the top cover structure further includes an explosion-proof valve and a protective patch;

[0016] The explosion-proof valve is installed at the second installation port, and the protection patch is installed at the first installation port.

[0017] Optionally, the lower plastic is further provided with a plurality of grooves and mounting slots;

[0018] The plurality of grooves are disposed at both ends of the lower plastic;

[0019] The mounting groove is arranged at the second mounting opening.

[0020] Optionally, the pole comprises a column and a base connected to each other, and a clamping protrusion for matching with a sealing member is provided on the column.

[0021] On the other hand, the utility model also proposes a battery, comprising the top cover structure, battery cell and shell as described in any one of the above items; the battery cell is arranged in the shell, the top cover body is connected to the shell, and the lower plastic support is between the top cover body and the battery cell; the pole ear of the battery cell is electrically connected to the pole.

[0022] The beneficial effects of the embodiments of the utility model are:

[0023] The top cover structure seals the first pole hole and the second pole hole at the same time by arranging a sealing member on the pole, thereby preventing the electrolyte from overflowing and corroding the top cover body. The structure also applies an anti-corrosion coating on the surface of the top cover body. When the electrolyte overflows onto the top cover body, it is only necessary to wipe the electrolyte with dust-free paper. After wiping the electrolyte, no electrolyte residue remains on the surface of the top cover body, thereby effectively preventing the corrosion of the aluminum top cover body caused by the overflowing electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is an exploded view of the top cover structure of an embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the pole and the upper plastic of an embodiment of the utility model;

[0027] Figure 3 This is a first structural schematic diagram of the top cover structure of an embodiment of the utility model;

[0028] Figure 4 This is a second structural schematic diagram of the top cover structure of an embodiment of the utility model;

[0029] Figure 5 This is a third structural schematic diagram of the top cover structure of an embodiment of the utility model.

[0030] Icons: 100-top cover structure; 110-top cover body; 111-first pole hole; 112-first injection hole; 113-first installation port; 114-spraying supplier mold number; 115-GB / T code area; 116-supplier traceability code; 120-lower plastic; 121-second pole hole; 122-second injection hole; 123-second installation port; 124-support; 1241-groove; 125-installation groove; 130-pole; 131-column; 1311-clamping protrusion; 132-base; 133-positive pole; 134-negative pole; 140-upper plastic; 141-clamping groove; 150-sealing ring; 160-explosion-proof valve; 170-protective patch. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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.

[0037] Please refer to Figure 1 This embodiment provides a battery for use in new energy vehicles; the battery can be a square aluminum shell battery.

[0038] This embodiment provides a battery, including a top cover structure 100, a battery cell (not shown) and a shell (not shown); the battery cell is arranged in the shell, the top cover body 110 is connected to the shell, and the lower plastic 120 is supported between the top cover body 110 and the battery cell; the electrode ear of the battery cell is electrically connected to the electrode column 130.

[0039] It can be understood that after the battery cell is installed in the shell, the top cover structure 100 is installed on the shell, the pole ear of the battery cell is welded to the pole 130, the upper plastic 140 is supported between the top cover body 110 and the battery cell for insulation, and finally the positioned top cover body 110 and the shell are welded and sealed.

[0040] In this embodiment, the battery includes a battery cell, which includes a positive electrode tab and a negative electrode tab; the positive electrode tab is electrically connected to the positive electrode column 133 , and the negative electrode tab is electrically connected to the negative electrode column 134 .

[0041] Please refer to Figure 1 In this embodiment, the battery includes a top cover structure 100. A top cover structure 100 provided in this embodiment includes a top cover body 110, a lower plastic 120 and a pole 130; a first pole hole 111 is provided on the top cover body 110, and a surface of the top cover body 110 is coated with an anti-corrosion coating; the lower plastic 120 is provided on one side of the top cover body 110, and a second pole hole 121 is provided on the lower plastic 120; a sealing member is sleeved on the pole 130 and passes through the second pole hole 121 and the first pole hole 111, one end of the sealing member is used to seal the first pole hole 111, and the other end is used to seal the second pole hole 121.

[0042] It can be understood that the top cover body 110 is coated with an anti-corrosion coating on the surface. When the electrolyte overflows onto the top cover body 110, it is only necessary to wipe the electrolyte with dust-free paper. After wiping the electrolyte, there is no electrolyte residue on the surface of the top cover body 110, thereby effectively preventing the overflowing electrolyte from corroding the aluminum top cover body 110; and a sealing member is provided on the pole 130 to seal the first pole hole 111 and the second pole hole 121 at the same time, thereby preventing the electrolyte from overflowing and corroding the top cover body 110.

[0043] In this embodiment, the top cover structure 100 includes a top cover body 110. The top cover body 110 is a rectangular cover plate structure, and the top cover body 110 is coated with an anti-corrosion coating for preventing the electrolyte from corroding the top cover body 110; wherein, the top cover body 110 is provided with two first pole holes 111, one of which is used to install the positive pole 133, and the other is used to install the negative pole 134.

[0044] In this embodiment, the material of the top cover body 110 is aluminum. Of course, in other embodiments, the material of the top cover body 110 is not limited to aluminum, but can also be other materials.

[0045] Optionally, the anti-corrosion coating has a thickness of 1-5 μm.

[0046] Optionally, the anti-corrosion coating includes at least one of a polytetrafluoroethylene coating, an acrylic material coating, a PET coating or a PC plastic coating.

[0047] It is worth mentioning that the anti-corrosion coating may be applied to the top cover body 110 by plasma spraying, supersonic flame spraying or the like.

[0048] Optionally, a first liquid injection hole 112 and a first installation port 113 are further provided on the top cover body; wherein the first liquid injection hole 112 is used for injecting electrolyte, and the first installation port 113 is used for installing the protective patch 170 .

[0049] Optionally, see Figure 3 and Figure 5 A reserved area for spraying the supplier mold number 114, the GB / T code area 115 and the supplier traceability code 116 is also provided on the top cover body.

[0050] Please refer to Figure 1 In this embodiment, the top cover structure 100 includes a lower plastic 120. The lower plastic 120 is a support structure for insulating the battery cell and the top cover body 110; wherein, two second pole holes 121 are provided on the lower plastic 120, one of which is used to install the positive pole 133, and the other is used to install the negative pole 134; meanwhile, two rectangular grooves are provided on the back of the lower plastic 120, and the two rectangular grooves are provided correspondingly to the two second pole holes 121.

[0051] In this embodiment, support portions 124 are disposed at both ends of the lower plastic 120 , and a plurality of grooves 1241 are disposed on the end surfaces of the support portions 124 ; the provision of the grooves 1241 can reduce the weight of the lower plastic 120 .

[0052] Optionally, the lower plastic 120 is provided with a second injection hole 122 and a second installation port 123. The first injection hole 112 and the second injection hole 122 are correspondingly arranged and used together to inject electrolyte; the first installation port 113 and the second installation port 123 are correspondingly arranged, and the second installation port 123 is used to install the explosion-proof valve 160.

[0053] Please refer to Figure 1 In this embodiment, the lower plastic 120 is further provided with a mounting groove 125, and the lower plastic 120 is recessed downward at the second mounting opening 123 to form the mounting groove 125. Figure 4 The depth of the mounting groove 125 is consistent with the height of the supporting portion 124 , which can enhance the supporting capacity of the lower plastic 120 .

[0054] In this embodiment, the top cover structure 100 includes a pole 130 ; wherein the pole 130 includes a positive pole 133 and a negative pole 134 of the same structure, the positive pole 133 is electrically connected to the positive electrode tab, and the negative pole 134 is electrically connected to the negative electrode tab.

[0055] Optional, see Figure 2 The pole 130 includes a connected column 131 and a base 132, and the column 131 is provided with an annular clamping protrusion 1311 for matching the seal. When installed, the base 132 passes through the back of the lower plastic 120 and is positioned in cooperation with the rectangular groove on the lower plastic 120.

[0056] In this embodiment, the top cover structure 100 includes a sealing member.

[0057] Optionally, the sealing member includes an upper plastic 140 and a sealing ring 150, and the sealing ring 150 and the upper plastic 140 are sequentially sleeved with the pole 130. The inner ring of the upper plastic 140 is provided with a clamping groove 141 that is engaged with the clamping protrusion 1311, and the upper plastic 140 is clamped with the pole 130 through the clamping groove 141 and the sealing ring 150 is pressed against the lower plastic 120, and the outer wall of the upper plastic 140 is tightly attached to the inner wall of the first pole hole 111.

[0058] It can be understood that the pole 130 is passed through the second pole hole 121 from the back of the upper plastic 140, and the sealing ring 150 and the upper plastic 140 are sleeved on the pole 130 in sequence, and the clamping groove 141 of the upper plastic 140 is clamped and matched with the clamping protrusion 1311 of the pole 130; the first pole hole 111 of the top cover body 110 is inserted into the pole 130, so that the outer wall of the upper plastic 140 is tightly attached to the inner wall of the first pole hole 111, so as to achieve the sealing of the first pole hole 111; at the same time, the sealing ring 150 is pressed so that the sealing ring 150 is attached to the end face of the lower plastic 120 at the second pole hole 121, thereby achieving the sealing of the second pole hole 121.

[0059] In this embodiment, the top cover structure 100 includes an explosion-proof valve 160 and a protective patch 170 . The explosion-proof valve 160 is provided with a plurality of explosion-proof notches, and the explosion-proof valve 160 is installed at the second installation opening 123 , and the protective patch 170 is installed at the first installation opening 113 .

[0060] Please refer to Figure 1 The installation process of the battery and the top cover structure 100 proposed in this embodiment is as follows:

[0061] S1: Preparation. Before welding, make sure the top cover and battery housing surfaces are clean and dust-free.

[0062] S2: Install the top cover structure 100. Weld the positive electrode ear of the battery cell to the positive electrode column 133, and weld the negative electrode ear to the negative electrode column 134; insert the two second electrode holes 121 of the lower plastic 120 into the positive electrode column 133 and the negative electrode column 134 respectively; install the sealing ring 150 and the upper plastic 140 on the positive electrode column 133 and the negative electrode column 134 respectively; place the top cover body 110 at the opening of the battery shell, and ensure the sealing with the battery shell.

[0063] S3: Positioning. Position the top cover body 110 and the battery housing to ensure that they are positioned accurately to avoid welding deviation or poor connection.

[0064] S4: Welding equipment setting: Select appropriate welding equipment and parameters, such as welding current, welding time, etc., and determine the optimal parameters according to the materials of the battery shell and the top cover body 110.

[0065] S5: Inspection. After welding is completed, inspect the weld area to ensure that the weld is intact and well sealed. Welding quality can be verified by visual inspection, helium leak detection, etc.

[0066] S6: Cleaning and maintenance. Clean the welding area to ensure that there is no welding slag or other impurities left; at the same time, maintain the welding equipment, and regularly inspect and maintain it to ensure its normal operation.

[0067] In summary, the top cover structure 100 proposed in the utility model, by arranging a sealing member on the pole 130, the first pole hole 111 and the second pole hole 121 are sealed at the same time, thereby preventing the electrolyte from overflowing and corroding the top cover body 110; and by coating the surface of the top cover body 110 with an anti-corrosion coating, when the electrolyte overflows onto the top cover body 110, it is only necessary to wipe the electrolyte with dust-free paper. After wiping the electrolyte, no electrolyte residue is left on the surface of the top cover body 110, thereby effectively preventing the corrosion of the aluminum top cover body 110 caused by the overflowing electrolyte.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A top cover structure, characterized in that: include: A top cover body, wherein the top cover body is provided with a first pole hole, and a surface of the top cover body is coated with an anti-corrosion coating; A lower plastic, the lower plastic being arranged on one side of the top cover body, and the lower plastic being provided with a second pole hole; A pole, a sealing member is sleeved on the pole and passes through the second pole hole and the first pole hole, one end of the sealing member is used to seal the first pole hole, and the other end is used to seal the second pole hole.

2. The top cover structure according to claim 1, characterized in that: The thickness of the anti-corrosion coating is 1-5 μm.

3. The top cover structure according to claim 1, characterized in that: The anti-corrosion coating includes at least one of a polytetrafluoroethylene coating, an acrylic material coating, a PET coating or a PC plastic coating.

4. The top cover structure according to claim 1, characterized in that: The sealing member comprises an upper plastic and a sealing ring, and the sealing ring and the upper plastic are sleeved with the pole in sequence; The upper plastic is clamped with the pole and presses the sealing ring and the lower plastic tightly, and the outer wall of the upper plastic is tightly attached to the inner wall of the first pole hole.

5. The top cover structure according to claim 4, characterized in that: The pole is provided with a clamping protrusion; The inner ring of the upper plastic is provided with a clamping groove which is engaged with the clamping protrusion.

6. The top cover structure according to claim 1, characterized in that: The top cover body is also provided with a first liquid injection hole and a first mounting port; The lower plastic is provided with a second liquid injection hole corresponding to the first liquid injection hole and a second mounting opening corresponding to the first mounting opening.

7. The top cover structure according to claim 6, characterized in that: The top cover structure also includes an explosion-proof valve and a protective patch; The explosion-proof valve is installed at the second installation port, and the protection patch is installed at the first installation port.

8. The top cover structure according to claim 6, characterized in that: The lower plastic is also provided with a plurality of grooves and mounting slots; The plurality of grooves are disposed at both ends of the lower plastic; The mounting groove is arranged at the second mounting opening.

9. The top cover structure according to claim 1, characterized in that: The pole comprises a column and a base connected to each other, and a clamping protrusion for matching with a sealing member is arranged on the column.

10. A battery, characterized in that: Comprising the top cover structure, battery cell and shell as described in any one of claims 1 to 9; The battery cell is disposed in the shell, the top cover body is connected to the shell, and the lower plastic support is between the top cover body and the battery cell; The pole lug of the battery cell is electrically connected to the pole.

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