Battery cell top cover and battery

Abstract

The utility model provides a battery cell top cover and a battery, and relates to the technical field of lithium batteries. Specifically, the battery cell top cover comprises a cover plate, an upper pole and a lower pole, wherein the cover plate is provided with pole holes for accommodating the upper pole and the lower pole; the upper pole partially protrudes downwards to form a first groove, the lower pole partially protrudes upwards to form a second groove, and the bottom wall of the first groove is connected with the bottom wall of the second groove. Based on the arrangement of the first groove and the second groove, the weights of the upper pole and the lower pole are respectively reduced, and certain materials of the upper pole and the lower pole are saved, so that the lightweight design of the battery cell top cover is realized, and the manufacturing cost of the battery cell top cover is reduced at the same time.

Description

Technical Field

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

[0002] A power battery generally includes a shell and a top cover assembly that seals the top opening of the shell. The top cover assembly includes a top cover sheet and poles. The top cover sheet is provided with pole mounting holes for assembling corresponding positive poles and negative poles.

[0003] However, in the related art, the positive and negative poles are generally solid structures with heavy weight and high manufacturing cost. Utility Model Content

[0004] The utility model aims to provide a battery cell top cover and a battery, which can reduce the weight of an upper pole and a lower pole, and save a certain amount of material of the upper pole and the lower pole.

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

[0006] In the first aspect, the utility model provides a battery cell top cover, including a cover plate, an upper pole and a lower pole; the cover plate is provided with a pole hole for accommodating the upper pole and the lower pole; the upper pole partially protrudes downward to form a first groove, the lower pole partially protrudes upward to form a second groove, and the bottom wall of the first groove is connected to the bottom wall of the second groove.

[0007] In an optional embodiment, the opening end of the first groove faces opposite to the opening end of the second groove, and the outer side of the bottom wall of the first groove is connected to the outer side of the bottom wall of the second groove.

[0008] In an optional embodiment, the bottom wall of the first groove has the same size as the bottom wall of the second groove.

[0009] In an optional embodiment, the opening end of the first groove and the opening end of the second groove face the same direction, and the outer side of the bottom wall of the first groove is connected to the inner side of the bottom wall of the second groove.

[0010] In an optional embodiment, a bottom wall size of the first groove is smaller than a bottom wall size of the second groove, and a side wall of the first groove is connected to a side wall of the second groove.

[0011] In an optional embodiment, the bottom wall of the first groove is welded or bonded to the bottom wall of the second groove.

[0012] In an optional implementation, both the upper pole and the lower pole are made of aluminum; or, the upper pole is made of aluminum, and the lower pole is made of a copper-aluminum composite material.

[0013] In an optional embodiment, the battery cell top cover also includes an upper insulating member and a lower insulating member respectively connected to two sides opposite to the cover plate; the upper insulating member is used to insulate the upper pole from the cover plate, and to insulate the upper pole from external metal; the lower insulating member is used to insulate the lower pole from the cover plate, and to insulate the lower pole from the winding core.

[0014] In an optional embodiment, the cover plate is provided with a pressure relief hole, and the battery cell top cover further includes an explosion-proof valve welded to the wall of the pressure relief hole, and a protective patch cooperating with the explosion-proof valve.

[0015] In a second aspect, the utility model provides a battery, comprising a battery cell top cover as described in any one of the aforementioned embodiments.

[0016] The beneficial effects of the embodiments of the utility model include:

[0017] The present application provides a battery cell top cover and a battery, wherein the battery cell top cover includes a cover plate, an upper pole and a lower pole. The cover plate is provided with pole holes for accommodating the upper pole and the lower pole; the upper pole partially protrudes downward to form a first groove, and the lower pole partially protrudes upward to form a second groove, and the bottom wall of the first groove is connected to the bottom wall of the second groove. Based on the arrangement of the above-mentioned first groove and second groove, the weight of the upper pole and the lower pole is reduced respectively, and a certain amount of the upper pole and the lower pole material is saved, thereby realizing a lightweight design of the battery cell top cover, and at the same time reducing the manufacturing cost of the battery cell top cover; reducing the components of the top cover (such as rivet blocks), realizing structural simplification; facilitating assembly, and helping to improve manufacturing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A schematic diagram of a battery cell top cover from a first perspective provided in an embodiment of the utility model;

[0020] Figure 2 The embodiment of the utility model provides Figure 1 Schematic diagram of the cross section at AA;

[0021] Figure 3 The embodiment of the utility model provides Figure 1 Another cross-sectional diagram at AA in the middle;

[0022] Figure 4 A schematic diagram of a battery cell top cover from a second viewing angle provided by an embodiment of the utility model;

[0023] Figure 5 A schematic diagram of a battery cell top cover from a third viewing angle provided in an embodiment of the utility model.

[0024] Icons: 10-cell top cover; 100-cover plate; 110-pole hole; 130-pressure relief hole; 150-liquid injection hole; 200-pole; 300-upper pole; 310-first groove; 500-lower pole; 510-second groove; 710-upper insulating member; 730-lower insulating member; 750-seal; 810-explosion-proof valve; 830-protective patch. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, 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.

[0029] 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.

[0030] 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.

[0031] Figure 1 This is a schematic diagram of a battery cell top cover 10 provided by an embodiment of the utility model from a first perspective. Figure 2 The embodiment of the utility model provides Figure 1 Schematic diagram of the cross section at AA in the middle, Figure 3 The embodiment of the utility model provides Figure 1 Another cross-sectional view at AA in the middle. Figures 1 to 3 The utility model provides a battery cell top cover 10, which includes a cover plate 100, an upper pole 300 and a lower pole 500.

[0032] The cover plate 100 is provided with a pole hole 110 for accommodating the upper pole 300 and the lower pole 500 ; the upper pole 300 partially protrudes downward to form a first groove 310 , and the lower pole 500 partially protrudes upward to form a second groove 510 , and the bottom wall of the first groove 310 is connected to the bottom wall of the second groove 510 .

[0033] Based on the arrangement of the first groove 310 and the second groove 510, the weight of the upper pole 300 and the lower pole 500 are respectively reduced, and a certain amount of material of the upper pole 300 and the lower pole 500 is saved, thereby realizing a lightweight design of the battery cell top cover 10 and reducing the manufacturing cost of the battery cell top cover 10.

[0034] Considering the production efficiency and product quality of the cell top cover 10, the upper pole 300 and the lower pole 500 can be formed by an integrated stamping process. In addition, the first groove 310 and the second groove 510 can be welded or bonded to the bottom wall of the first groove 310 and the bottom wall of the second groove 510.

[0035] Specifically, when using the welding method, the laser penetrates from the bottom wall of the first groove 310 to the bottom wall of the second groove 510 for solidifying the weld; when using the bonding method, styrene-butadiene rubber or polyurethane can be selected as the bonding material for adhesion connection.

[0036] Please refer to Figure 1 , in this embodiment, the cover plate 100 can be correspondingly provided with two pole holes 110, serving as the positive pole hole 110 and the negative pole hole 110 respectively. Based on this, the pole 200 formed by the upper pole 300 and the lower pole 500 has different application scenarios. Therefore, both the upper pole 300 and the lower pole 500 are made of aluminum, or the upper pole 300 is made of aluminum and the lower pole 500 is made of copper-aluminum composite material.

[0037] Specifically, when both the upper pole 300 and the lower pole 500 are used as the positive pole, they are made of aluminum because a dense oxide film can be formed on the aluminum surface and it is not easily corroded at high potential; when both the upper pole 300 and the lower pole 500 are used as the negative pole, the upper pole 300 is made of aluminum with good welding performance, which is more convenient for welding with other components, and the lower pole 500 is made of copper-aluminum composite material with good electrical performance and no electrochemical corrosion, which is more convenient for contacting with the electrolyte for conduction.

[0038] Please refer to Figure 1 and Figure 4 , the cell top cover 10 further includes an upper insulating member 710 and a lower insulating member 730 respectively connected to the two opposite sides of the cover plate 100; the upper insulating member 710 is used to insulate the upper pole 300 from the cover plate 100 and to insulate the upper pole 300 from external metal; the lower insulating member 730 is used to insulate the lower pole 500 from the cover plate 100 and to insulate the lower pole 500 from the wound core.

[0039] Based on the above settings, it means that the pole 200 formed by the mutually connected upper pole 300 and lower pole 500 passes through the upper insulating member 710 and the lower insulating member 730 in sequence when passing through the pole hole 110 from top to bottom, so as to ensure insulation from external metal, the cover plate 100 and the wound core, thus avoiding battery short circuit or battery corrosion when the cell top cover 10 is applied to the battery, and further improving the safety of the battery and extending the service life of the battery.

[0040] Specifically, as Figure 1 shown, the upper insulating member 710 is designed in a "U" shape and is configured to wrap the upper part of the pole 200 to insulate it from the cover plate 100 or prevent short circuit with external metal. As Figure 4 shown, the lower insulating member 730 is designed in an integral or split structure and is configured to insulate the pole 200 or the connecting member inside the cell and the wound core from the cover plate 100.

[0041] In addition, please refer to Figure 2 and Figure 3 In order to ensure the sealing of the inner and outer sides of the cover plate 100 and the airtightness of the battery, the cell top cover 10 further includes a sealing member 750, which is disposed between the upper insulating member 710 and the lower insulating member 730 and is provided for the pole 200 to pass through. It should also be noted that the upper insulating member 710, the sealing member 750 and the lower insulating member 730 are all welded and fixed to the wall of the pole hole 110.

[0042] In order to prevent the battery using the battery cell top cover 10 provided in the present application from expanding or exploding, the cover plate 100 is provided with a pressure relief hole 130 , and the battery cell top cover 10 also includes an explosion-proof valve 810 welded to the wall of the pressure relief hole 130 , and a protective patch 830 cooperating with the explosion-proof valve 810 .

[0043] It is understandable that when the internal pressure of the battery exceeds the set safety threshold, the explosion-proof valve 810 can allow the gas to be released into the external environment through the pressure relief hole 130, effectively reducing the internal pressure of the battery and reducing the risk of explosion. In addition, the protective patch 830 is a flat sheet structure to avoid erosion by the electrolyte and the influence of the external environment.

[0044] See also Figure 5 In addition to the pressure relief hole 130 and the pole hole 110, the cover plate 100 is also provided with a liquid injection hole 150 to facilitate the user to maintain and manage the battery. Specifically, the user can inject electrolyte or other liquids through the liquid injection hole 150 to replenish the chemical substances in the battery, thereby achieving the purpose of extending the battery life or improving the battery performance.

[0045] Please refer again Figure 2 In some embodiments, the opening end of the first groove 310 faces the opposite direction to the opening end of the second groove 510, and the outer side of the bottom wall of the first groove 310 is connected to the outer side of the bottom wall of the second groove 510. Based on the above configuration, the basic height requirement of the formed pole 200 is guaranteed on the basis of saving materials, which is convenient for subsequent installation. Furthermore, considering that the connection area is easy to increase the stability of the connection between the upper pole 300 and the lower pole 500, the bottom wall of the first groove 310 is the same size as the bottom wall of the second groove 510.

[0046] Please refer again Figure 3In other embodiments, the opening end of the first groove 310 and the opening end of the second groove 510 face the same direction, and the outer side of the bottom wall of the first groove 310 is connected to the inner side of the bottom wall of the second groove 510. Based on the above configuration, it is convenient to coordinate and position the upper pole 300 and the lower pole 500, and avoid displacement of the two during connection, resulting in poor connection. In order to further improve the accuracy of positioning, the bottom wall size of the first groove 310 is smaller than the bottom wall size of the second groove 510, and the side wall of the first groove 310 is connected to the side wall of the second groove 510.

[0047] It is understandable that in Figure 3 In the embodiment shown, since the upper pole 300 is embedded in the lower pole 500, the side wall of the first groove 310 may be provided with a thread matching the side wall of the second groove 510, and the two are connected by threads. Similarly, the lower pole 500 may also be embedded in the upper pole 300 and fixed by threaded connection, which will not be described in detail here.

[0048] In addition, it should be noted that Figure 2 In the embodiment shown, the accuracy of positioning and matching can be improved by adding positioning parts, such as providing a clamping structure on the bottom wall of the first groove 310 and the bottom wall of the second groove 510, or providing a limiting structure on the circumference of the side wall of the first groove 310 or the second groove 510. Figure 3 In the illustrated embodiment, the basic height of the pole 200 can be ensured by extending the protruding height of the upper pole 300 or the lower pole 500 .

[0049] In summary, the present application provides a battery cell top cover 10, which includes a cover plate 100, an upper pole 300 and a lower pole 500. The cover plate 100 is provided with a pole hole 110 for accommodating the upper pole 300 and the lower pole 500; the upper pole 300 partially protrudes downward to form a first groove 310, and the lower pole 500 partially protrudes upward to form a second groove 510, and the bottom wall of the first groove 310 is connected to the bottom wall of the second groove 510. Based on the above-mentioned arrangement of the first groove 310 and the second groove 510, the weight of the upper pole 300 and the lower pole 500 is reduced respectively, and a certain amount of material of the upper pole 300 and the lower pole 500 is saved, thereby realizing the lightweight design of the battery cell top cover 10 and reducing the manufacturing cost of the battery cell top cover 10 at the same time.

[0050] In addition, the present application also provides a battery, which includes the battery cell top cover 10 in the above embodiment, thereby also reducing the weight of the upper pole 300 and the lower pole 500, saving a certain amount of material of the upper pole 300 and the lower pole 500, thereby achieving a lightweight design and reducing manufacturing costs at the same time.

[0051] 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 battery cell top cover, characterized in that: The invention comprises a cover plate (100), an upper pole (300) and a lower pole (500); the cover plate (100) is provided with a pole hole (110) for accommodating the upper pole (300) and the lower pole (500); the upper pole (300) is partially protruded downward to form a first groove (310), the lower pole (500) is partially protruded upward to form a second groove (510), and the bottom wall of the first groove (310) is connected to the bottom wall of the second groove (510).

2. The battery cell top cover according to claim 1, characterized in that: The opening end of the first groove (310) faces opposite to the opening end of the second groove (510), and the outer side of the bottom wall of the first groove (310) is connected to the outer side of the bottom wall of the second groove (510).

3. The battery cell top cover according to claim 2, characterized in that: The bottom wall of the first groove (310) and the bottom wall of the second groove (510) have the same size.

4. The battery cell top cover according to claim 1, characterized in that: The opening end of the first groove (310) and the opening end of the second groove (510) are oriented in the same direction, and the outer side of the bottom wall of the first groove (310) is connected to the inner side of the bottom wall of the second groove (510).

5. The battery cell top cover according to claim 4, characterized in that: The size of the bottom wall of the first groove (310) is smaller than the size of the bottom wall of the second groove (510), and the side wall of the first groove (310) is connected to the side wall of the second groove (510).

6. The battery cell top cover according to any one of claims 1 to 5, characterized in that: The bottom wall of the first groove (310) and the bottom wall of the second groove (510) are welded or bonded.

7. The battery cell top cover according to any one of claims 1 to 5, characterized in that: The upper pole (300) and the lower pole (500) are both made of aluminum; Alternatively, the upper pole (300) is made of aluminum, and the lower pole (500) is made of a copper-aluminum composite material.

8. The battery cell top cover according to any one of claims 1 to 5, characterized in that: The cell top cover (10) further comprises an upper insulating member (710) and a lower insulating member (730) respectively connected to two sides opposite to the cover plate (100); the upper insulating member (710) is used to insulate the upper pole (300) from the cover plate (100), and is used to insulate the upper pole (300) from external metal; the lower insulating member (730) is used to insulate the lower pole (500) from the cover plate (100), and is used to insulate the lower pole (500) from the winding core.

9. The battery cell top cover according to any one of claims 1 to 5, characterized in that: The cover plate (100) is provided with a pressure relief hole (130), and the battery cell top cover (10) further comprises an explosion-proof valve (810) welded to the wall of the pressure relief hole (130), and a protective patch (830) matched with the explosion-proof valve (810).

10. A battery, characterized in that: It comprises a battery cell top cover (10) as claimed in any one of claims 1 to 9.

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