Battery cell top cover assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, particularly provides a battery cell top cover assembly and a battery cell, and aims to solve the problem that in the prior art, a welding part between the middle part of a top cover of the battery cell in the length direction and a shell is easily broken through by air pressure to cause air leakage and failure of the battery cell. In order to achieve the purpose, the battery cell top cover assembly comprises a light aluminum sheet, a first protrusion is arranged on the bottom face of the middle of the light aluminum sheet in the length direction, and the first protrusion is arranged to be capable of being connected with a battery cell shell so as to increase the connecting area of the light aluminum sheet and the battery cell shell. According to the battery cell top cover assembly, the connection area between the middle part of the light aluminum sheet in the length direction and the battery cell shell is increased by arranging the first bulge, so that the welding area at the position can be increased, the welding power can be increased during welding, and the welding strength at the position is further improved; the problem that the welding part of the middle part of the battery cell top cover assembly in the length direction and the battery cell shell is easily broken by air pressure to cause air leakage and failure of the battery cell can be avoided, so that the safety and the service life of the battery cell can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically provide a kind of top cover assembly and electric core of electric core. BACKGROUND

[0002] With the vigorous development of new energy industry, energy storage battery is widely concerned by people, and the safety of lithium ion energy storage battery is one of the problems that people focus on.

[0003] Lithium ion battery will continuously charge and discharge in use process, in this process, the temperature inside the electric core rises with the continuous charge and discharge of electric core, and the temperature rise will produce side reaction and produce gas. In the process of gas accumulation, the internal pressure of electric core gradually becomes larger and continuously impacts the shell and top cover of electric core. Since the top cover of electric core and the shell are usually connected and fixed by welding, the middle part of the length direction is most prone to deformation, so the connection position is easy to be broken by gas pressure, resulting in air leakage failure of electric core.

[0004] Correspondingly, there is a need for a new electric core top cover assembly to solve the above problems. INVENTION CONTENTS

[0005] The utility model aims at solving the above technical problem, that is, solving the problem that the middle part of the length direction of the top cover of the electric core and the welding of the shell are easy to be broken by gas pressure, resulting in air leakage failure of electric core.

[0006] In the first aspect, the utility model provides a kind of electric core top cover assembly, the electric core top cover assembly includes light aluminum sheet, the bottom surface of the middle part of the length direction of the light aluminum sheet is equipped with first protrusion, the first protrusion is set as can be connected with electric core shell, to increase the connection area of the light aluminum sheet and the electric core shell.

[0007] In the case of adopting the above technical scheme, by setting first protrusion to increase the connection area of the middle part of the length direction of light aluminum sheet and electric core shell, the welding area at this place can be increased, and the welding power can also be increased when welding, thereby improving the welding strength at this place, which can avoid the problem that the middle part of the length direction of electric core top cover assembly and the welding of electric core shell are easy to be broken by gas pressure, resulting in air leakage failure of electric core, thereby improving the safety and service life of electric core.

[0008] In the specific embodiment of the above electric core top cover assembly, the light aluminum sheet is provided with an explosion-proof valve hole, the first protrusion penetrates the light aluminum sheet along the width direction of the light aluminum sheet and is located at the outer periphery of the explosion-proof valve hole, and the end face of the first protrusion is flush with the length direction edge of the light aluminum sheet.

[0009] In the technical scheme, the first protrusion is arranged on the outer periphery of the explosion-proof valve hole, so that the strength of the explosion-proof valve hole of the light aluminum sheet is increased, and the end surface of the first protrusion is flush with the edge of the light aluminum sheet in the length direction, so that the cell shell is in contact with the edge of the light aluminum sheet and the end surface of the first protrusion at the same time, thereby increasing the contact area of the cell shell and the light aluminum sheet, increasing the welding strength, and avoiding the problem that the explosion-proof valve hole of the light aluminum sheet is easily deformed by air pressure impact, resulting in battery leakage failure.

[0010] In the embodiment of the cell top cover assembly, the cell top cover assembly further comprises a lower plastic arranged below the light aluminum sheet, and a groove is arranged at the top of the lower plastic, and the first protrusion is arranged in the groove.

[0011] In the technical scheme, the lower plastic and the light aluminum sheet can be conveniently matched and installed, and the close fit of the lower plastic and the light aluminum sheet can be ensured.

[0012] In the embodiment of the cell top cover assembly, the explosion-proof valve hole is elliptical, and the length direction of the explosion-proof valve hole is arranged along the width direction of the light aluminum sheet.

[0013] In the technical scheme, the elliptical explosion-proof valve hole is arranged to install the elliptical explosion-proof valve, and the length direction of the explosion-proof valve hole is arranged along the width direction of the light aluminum sheet, so as to provide more space for the installation of the pole, and the total length of the light aluminum sheet can be reduced according to the need, thereby providing more optional space for the length of the light aluminum sheet.

[0014] In the embodiment of the cell top cover assembly, the thickness of the first protrusion is h1, the depth of the groove is h2, and h1≤h2 is satisfied.

[0015] In the technical scheme, the lower plastic and the light aluminum sheet can be conveniently matched and installed, and the close fit of the lower plastic and the light aluminum sheet can be ensured.

[0016] In the embodiment of the cell top cover assembly, a second protrusion is arranged on the bottom surface of the groove of the lower plastic.

[0017] In the technical scheme, by arranging the second protrusion on the bottom surface of the groove of the lower plastic, the thickness of the lower plastic is only increased at the groove under the premise that the depth of the groove is sufficient, and the thickness of the lower plastic is not increased at other positions, thereby reducing the increase of the overall weight.

[0018] In the specific embodiment of the top cover assembly of the battery cell, the second protrusion has a thickness h3, the total thickness of the lower plastic at the second protrusion is h4, and the following conditions are met: h2≤h4-h3, 4mm≤h4≤5.5mm, and h4-h3≤2mm.

[0019] In the case of using the above technical solution, it can be ensured that the lower plastic can be fused on the light aluminum sheet.

[0020] In the specific embodiment of the top cover assembly of the battery cell, the first protrusion has a width d1 along the length direction of the light aluminum sheet, the groove has a width d2 along the width direction of the first protrusion, and the following conditions are met: d1≤d2, 10mm≤d1≤40mm; and / or the bottom of the first protrusion is provided with a first chamfer, and the groove is provided with a second chamfer, and the second chamfer is arranged corresponding to the first chamfer.

[0021] In the case of using the above technical solution, by limiting the sizes of d1 and d2, it is ensured that the first protrusion can improve the welding area with the battery cell shell, and the matching installation of the lower plastic and the light aluminum sheet is also ensured; by arranging the first chamfer and the second chamfer, the safety is improved, and the matching installation of the lower plastic and the light aluminum sheet is facilitated.

[0022] In the specific embodiment of the top cover assembly of the battery cell, the first protrusion is arranged on the bottom surface of the middle of the length direction of the light aluminum sheet.

[0023] In the case of using the above technical solution, since the middle of the length direction of the light aluminum sheet, and the deformation amount of the part of the battery cell shell at this position is larger than that at other positions, arranging the first protrusion on the bottom surface of the middle of the length direction of the light aluminum sheet can further avoid being broken by air pressure, and improve the safety and service life of the battery cell.

[0024] In the second aspect, the utility model also provides a battery cell, the battery cell includes the top cover assembly and battery cell shell, the top cover assembly is connected to the top of the battery cell shell.

[0025] In the case of using the above technical solution, the safety and service life of the battery cell can be improved.

[0026] Compared with the prior art, the electric core top cover assembly has the beneficial effects that the first protrusion is arranged to increase the connection area of the middle part of the length direction of the light aluminum sheet and the electric core shell, the welding area at the position is increased, the welding power is increased during welding, the welding strength at the position is improved, and the problem that the middle part of the length direction of the electric core top cover assembly and the welding position of the electric core shell are easily broken by air pressure to cause the electric core to leak and fail is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0027] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0028] Figure 1 is a schematic diagram of the overall structure of the electric core top cover assembly of the present application;

[0029] Figure 2 is a schematic diagram of the structure of the light aluminum sheet of the present application;

[0030] Figure 3 is an exploded view of part of the structure of the electric core top cover assembly of the present application;

[0031] Figure 4 is Figure 3 is a schematic diagram of the local enlarged structure of part A.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1 - light aluminum sheet, 2 - lower plastic, 3 - positive pole, 4 - negative pole, 5 - explosion-proof valve, 11 - first protrusion, 12 - explosion-proof valve hole, 21 - groove, 22 - second protrusion. DETAILED DESCRIPTION

[0034] Some embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments according to the needs in order to adapt to specific application occasions.

[0035] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or position relationship are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the related devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0036] In addition, it should be noted that, in the description of the utility model, ordinal numbers "first", "second" and the like are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In addition, in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection, it can be mechanical connection, or electrical connection, it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] Based on the background technology, the welding position of the middle part of the length direction of the top cover of the existing battery and the shell is easy to be broken by air pressure, which leads to the problem of battery leakage failure. The utility model discloses a battery top cover assembly, which comprises a light aluminum sheet, a lower plastic, a positive pole, a negative pole and a pressure relief valve. The outer periphery of the light aluminum sheet is connected with the inner wall of the top of the battery shell. The lower plastic is fusedly connected below the light aluminum sheet. The pressure relief valve is installed in the middle part of the length direction of the light aluminum sheet. The pressure relief valve is used to release pressure when the internal pressure or temperature of the battery reaches the set upper limit value, so as to improve the safety and service life of the battery. The positive pole and the negative pole are installed on both sides of the pressure relief valve along the length direction of the light aluminum sheet.

[0038] The utility model discloses a battery top cover assembly, which comprises a light aluminum sheet, a lower plastic, a positive pole, a negative pole and a pressure relief valve. The outer periphery of the light aluminum sheet is connected with the inner wall of the top of the battery shell. The lower plastic is fusedly connected below the light aluminum sheet. The pressure relief valve is installed in the middle part of the length direction of the light aluminum sheet. The pressure relief valve is used to release pressure when the internal pressure or temperature of the battery reaches the set upper limit value, so as to improve the safety and service life of the battery. The positive pole and the negative pole are installed on both sides of the pressure relief valve along the length direction of the light aluminum sheet.

[0039] Firstly, refer to Figure 1 , Figure 1 It is the whole structure schematic diagram of the utility model discloses a battery top cover assembly. As shown in Figure 1 The battery lamp cover assembly comprises a light aluminum sheet, a lower plastic, a positive pole, a negative pole and a pressure relief valve. The outer periphery of the light aluminum sheet is connected with the inner wall of the top of the battery shell. The lower plastic is fusedly connected below the light aluminum sheet. The pressure relief valve is installed in the middle part of the length direction of the light aluminum sheet. The pressure relief valve is used to release pressure when the internal pressure or temperature of the battery reaches the set upper limit value, so as to improve the safety and service life of the battery. The positive pole and the negative pole are installed on both sides of the pressure relief valve along the length direction of the light aluminum sheet.

[0040] Next, refer to Figure 2 , Figure 2It is the structure diagram of the aluminum sheet of the utility model. As shown in the drawing, Figure 2 The first protrusion 11 is arranged on the bottom surface of the middle part of the length direction of the aluminum sheet 1, and the first protrusion 11 is arranged to be connected with the shell of the battery cell, so as to increase the connecting area of the aluminum sheet 1 and the shell of the battery cell. By arranging the first protrusion 11, the connecting area of the middle part of the length direction of the aluminum sheet 1 and the shell of the battery cell is increased, the welding area at this position is increased, the welding strength at this position is improved, the middle part of the length direction of the top cover assembly of the battery cell and the welding position of the shell of the battery cell are prevented from being easily broken by the air pressure, the air leakage failure of the battery cell is avoided, and the safety and service life of the battery cell are improved.

[0041] It should be noted that the middle part of the length direction of the aluminum sheet 1 refers to the middle region of the aluminum sheet 1 except the two ends. As an optional embodiment, the first protrusion 11 is arranged on the bottom surface of the middle of the length direction of the aluminum sheet 1. Since the middle of the length direction of the aluminum sheet 1 and the deformation amount of the part of the shell of the battery cell at this position are larger than those at other positions, the first protrusion 11 is arranged on the bottom surface of the middle of the length direction of the aluminum sheet 1, so that the safety and service life of the battery cell are further improved.

[0042] Continuously referring to Figure 1 and Figure 2 , the aluminum sheet 1 is provided with an explosion-proof valve hole 12, the explosion-proof valve hole 12 is used for installing an explosion-proof valve 5, the first protrusion 11 penetrates the aluminum sheet 1 along the width direction of the aluminum sheet 1 and is located at the outer periphery of the explosion-proof valve hole 12, and the end surface of the first protrusion 11 is flush with the length direction edge of the aluminum sheet 1. Since the setting of the explosion-proof valve hole 12 makes the strength of the explosion-proof valve hole 12 of the aluminum sheet 1 lower and easy to deform, the first protrusion 11 is arranged at the outer periphery of the explosion-proof valve hole 12, so that the strength of the explosion-proof valve hole 12 of the aluminum sheet 1 is increased, the end surface of the first protrusion 11 is flush with the length direction edge of the aluminum sheet 1, the shell of the battery cell is in contact with the length direction edge of the aluminum sheet 1 and the end surface of the first protrusion 11 at the same time, the contact area of the aluminum sheet 1 and the shell of the battery cell is increased, the welding strength is increased, and the problem that the explosion-proof valve hole 12 of the aluminum sheet 1 is easily deformed by the air pressure and causes the air leakage failure of the battery cell is avoided.

[0043] It should be noted that the end surface of the first protrusion 11 refers to the end surface of the first protrusion 11 on the same side of the length direction edge of the aluminum sheet 1.

[0044] Optionally, the explosion-proof valve hole 12 can be elliptical, with its length direction aligned with the width direction of the aluminum sheet 1. Since an elliptical explosion-proof valve 5 offers better explosion-proof performance, the explosion-proof valve hole 12 is elliptical to accommodate the elliptical explosion-proof valve 5. The fact that the length direction of the explosion-proof valve hole 12 is aligned with the width direction of the aluminum sheet 1 provides more space for the installation of the electrode post and allows for a reduction in the overall length of the aluminum sheet 1 as needed, offering more flexibility in its length selection. Alternatively, the length direction of the explosion-proof valve hole 12 can also be aligned with the length direction of the aluminum sheet 1. Furthermore, the explosion-proof valve hole 12 can also be circular, and the explosion-proof valve 5 installed within it can also be circular; adjustments can be made as needed by those skilled in the art.

[0045] Those skilled in the art will understand that, although the above combination Figure 2 The description states that the first protrusion 11 penetrates the aluminum sheet 1 along the width direction and is located on the outer periphery of the explosion-proof valve hole 12. However, this is not a limitation. The shape of the first protrusion 11 can also be elongated. At least two elongated first protrusions 11 are provided and are respectively provided at both ends of the middle part of the aluminum sheet 1 along the length direction of the aluminum sheet 1. The two outermost first protrusions 11 can be connected to the battery cell housing. In addition, the shape of the first protrusion 11 can also be square. The first protrusion 11 is provided on the outer periphery of the explosion-proof valve hole 12, and the part of the first protrusion 11 parallel to the length direction of the aluminum sheet 1 can be connected to the battery cell housing. Those skilled in the art can make adjustments as needed. As long as the first protrusion 11 can be connected to the battery cell housing to increase the connection area between the aluminum sheet 1 and the battery cell housing, it can avoid the problem that the welded joint between the middle part of the battery cell top cover assembly and the battery cell housing in the length direction is easily broken by air pressure, resulting in battery cell leakage and failure. It can also increase the strength of the explosion-proof valve hole 12 of the aluminum sheet 1. All the above adjustments do not deviate from the principle of this utility model and are within the protection scope of this utility model.

[0046] See below. Figure 3 and Figure 4 , Figure 3 This is an exploded view of a portion of the structure of the battery cell top cover assembly of this utility model. Figure 4 yes Figure 3 A partially enlarged structural diagram of part A. (See diagram below.) Figure 3 and Figure 4As shown, the top of the lower plastic 2 is provided with a groove 21, the first protrusion 11 is arranged in the groove 21, the thickness of the first protrusion 11 is h1, the depth of the groove 21 is h2, and h1≤h2 is satisfied; the matching installation of the lower plastic 2 and the light aluminum sheet 1 can be facilitated, and the close fit of the lower plastic 2 and the light aluminum sheet 1 can be ensured. The bottom surface of the groove 21 of the lower plastic 2 is provided with a second protrusion 22, by arranging the second protrusion 22, the thickness of the lower plastic 2 at the groove 21 can be increased only under the premise that the depth of the groove 21 is sufficient, and the thickness of the lower plastic 2 at other positions is not increased, thereby reducing the increase of the overall weight. The thickness of the second protrusion 22 is h3, the total thickness of the lower plastic 2 at the second protrusion 22 is h4, and h2≤h4-h3, 4mm≤h4≤5.5mm, h4-h3≤2mm are satisfied, so that the lower plastic 2 can be ensured to be fused on the light aluminum sheet 1. The width of the first protrusion 11 along the length direction of the light aluminum sheet 1 is d1, the width of the groove 21 along the width direction of the first protrusion 11 is d2, and d1≤d2, 10mm≤d1≤40mm are satisfied; under the premise that the first protrusion 11 can improve the welding area with the battery cell shell, the matching installation of the lower plastic 2 and the light aluminum sheet 1 is also ensured.

[0047] Optionally, the bottom of the first protrusion 11 is provided with a first chamfer, and the groove 21 is provided with a second chamfer, the second chamfer is arranged corresponding to the first chamfer, which improves safety and facilitates the matching installation of the lower plastic 2 and the light aluminum sheet 1. The first chamfer and the second chamfer can be 60° or 45° or other angles, which are not limited here.

[0048] It should be noted that the above embodiments are only used to illustrate the principle of the present application, and are not intended to limit the protection scope of the present application, and those skilled in the art can adjust the above embodiments without deviating from the principle of the present application, so that the present application can be applied to more specific application scenarios.

[0049] So far, the technical scheme of the present application has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to related technical features without deviating from the principle of the present application, and the technical scheme after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A battery cell top cover assembly, characterized in that, The battery cell top cover assembly includes a light aluminum sheet, and a first protrusion is provided on the bottom surface of the middle part of the light aluminum sheet in the length direction. The first protrusion is configured to be able to connect with the battery cell housing to increase the connection area between the light aluminum sheet and the battery cell housing.

2. The cell top cover assembly according to claim 1, characterized in that, The aluminum sheet is provided with an explosion-proof valve hole. The first protrusion penetrates the aluminum sheet along the width direction and is located on the outer periphery of the explosion-proof valve hole. The end face of the first protrusion is flush with the edge of the aluminum sheet along its length direction.

3. The cell top cover assembly according to claim 1, characterized in that, The battery cell top cover assembly also includes a lower plastic sheet located below the aluminum sheet, the top of which has a groove, and the first protrusion is located within the groove.

4. The cell top cover assembly according to claim 2, characterized in that, The explosion-proof valve hole is elliptical, and its length is set along the width of the aluminum sheet.

5. The cell top cover assembly according to claim 3, characterized in that, The thickness of the first protrusion is h1, and the depth of the groove is h2, satisfying that h1≤h2.

6. The cell top cover assembly according to claim 5, characterized in that, A second protrusion is provided on the bottom surface of the groove in the lower plastic.

7. The cell top cover assembly according to claim 6, characterized in that, The thickness of the second protrusion is h3, and the total thickness of the lower plastic at the second protrusion is h4, satisfying: h2≤h4-h3, 4mm≤h4≤5.5mm, h4-h3≤2mm.

8. The cell top cover assembly according to claim 3, characterized in that, The width of the first protrusion along the length of the aluminum sheet is d1, and the width of the groove along the width of the first protrusion is d2, satisfying: d1≤d2, 10mm≤d1≤40mm; and / or The bottom of the first protrusion is provided with a first chamfer, and the groove is provided with a second chamfer, the second chamfer being provided in correspondence with the first chamfer.

9. The cell top cover assembly according to claim 1, characterized in that, The first protrusion is located on the bottom surface at the exact center of the length direction of the aluminum sheet.

10. A battery cell, characterized in that, The battery cell includes a battery cell top cover assembly and a battery cell housing as described in any one of claims 1 to 9, wherein the battery cell top cover assembly is connected to the top of the battery cell housing.

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