Light cover plate, battery top cover and battery with same

Abstract

The utility model belongs to the technical field of power batteries, and discloses a light cover plate, a battery top cover and a battery. The light cover plate comprises a first plate body and a second plate body, the first plate body is connected to the second plate body, the second plate body is arranged at the bottom of the first plate body, the first plate body is a stainless steel part, the second plate body is an aluminum part, and the second plate body is used for being connected to an aluminum anti-explosion valve in a welded mode. According to the light cover plate, the second plate body made of the aluminum material is connected with the aluminum anti-explosion valve in a welded mode, and the second plate body and the aluminum anti-explosion valve are made of the same material, so that the situation that a welding part deforms or cracks due to the fact that the welding materials are different and the thermophysical performance difference is large can be avoided; therefore, the welding stability between the light cover plate and the aluminum anti-explosion valve is ensured, the stability and the reliability of the connection between the light cover plate and the aluminum anti-explosion valve are effectively improved, and the durability, the reliability, the safety and the stability of the battery top cover and the battery using the light cover plate are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a light cover, a battery top cover and a battery having the same. Background Art

[0002] Power batteries are batteries that provide power for devices, typically referring to the storage batteries that power electric vehicles, electric trains, and electric bicycles. To reduce the probability of power battery explosion, an explosion-proof valve is typically installed on the top of the battery. When the internal pressure of the battery exceeds a specified value, the explosion-proof valve ruptures to release the internal pressure of the power battery, thereby reducing the probability of battery explosion.

[0003] Batteries usually mainly include battery cells, battery shells and battery top covers. In the battery top cover, the light cover is sealed and connected to the opening edge of the battery shell to seal and insulate the internal battery cells from the external environment. At present, in order to improve the stability of the light cover, the existing technology provides a stainless steel cover. Compared with traditional aluminum materials, the stainless steel light cover has higher material strength, stronger impact resistance and better safety performance. However, for welding stainless steel explosion-proof valves with stainless steel light covers, the stamping process is not mature due to the material of the stainless steel explosion-proof valve, and the processing is difficult, resulting in unstable burst values and difficulty in opening, which poses a great safety hazard. In comparison, aluminum explosion-proof valves have better stability and controllability, but due to the different materials, the thermal physical properties between aluminum explosion-proof valves and stainless steel light covers are quite different, resulting in deformation or cracking of the welding parts, affecting the welding quality.

[0004] Based on the above, there is an urgent need for a light cover, a battery top cover and a battery having the same to solve the problems existing in the prior art. Utility Model Content

[0005] One purpose of the utility model is to provide a light cover plate, which is used to solve the technical problem of poor welding between a stainless steel light cover plate and an aluminum explosion-proof valve in the prior art.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A light cover is used on a battery. The light cover includes a first plate and a second plate. The first plate is connected to the second plate, and the second plate is arranged at the bottom of the first plate. The first plate is made of stainless steel and the second plate is made of aluminum. The second plate is used for welding to the aluminum explosion-proof valve.

[0008] Preferably, the projected area of the second plate on the horizontal plane is smaller than the projected area of the first plate on the horizontal plane.

[0009] Preferably, the projected area of the second plate body on the horizontal plane is equal to the projected area of the first plate body on the horizontal plane.

[0010] Preferably, the first plate body is provided with explosion-proof vent holes and through holes. The through holes communicate with the interior of the battery. Along the length direction of the light cover plate, the distance between the axis of the explosion-proof vent hole and the through hole is set as h1, and the distance between the end of the second plate body and the center of the second plate body is set as h2, and h1 > h2.

[0011] Preferably, the through hole is a liquid injection hole.

[0012] Preferably, a limiting groove is provided at the bottom of the first plate body, and the second plate body is embedded in the limiting groove, and the bottom surface of the second plate body is horizontally flush with the bottom surface of the first plate body.

[0013] Preferably, the horizontal cross-sectional shape of the second plate body is square.

[0014] Preferably, the first plate body and the second plate body are integrally formed by stamping.

[0015] The beneficial effects of the light cover plate provided by the present utility model: The first plate body, as the main part of the light cover plate, is made of stainless steel material, which can ensure the high structural strength, strong impact resistance and good safety performance of the light cover plate. On this basis, the light cover plate is welded and connected to the aluminum explosion-proof valve through the second plate body made of aluminum material. Since the material of the second plate body is the same as that of the aluminum explosion-proof valve, the situation of deformation or cracking at the welding part caused by different welding materials and large differences in thermophysical properties can be avoided, thereby ensuring the welding stability between the light cover plate and the aluminum explosion-proof valve, and further effectively improving the stable reliability of the connection between the light cover plate and the aluminum explosion-proof valve.

[0016] Another object of the present utility model is to provide a battery top cover, which can enhance durability and use safety stability.

[0017] To achieve this purpose, the present utility model adopts the following technical solutions:

[0018] The battery top cover includes the above-mentioned light cover plate.

[0019] The beneficial effects of the battery top cover provided by the present utility model: The battery top cover includes the above-mentioned light cover plate. Since the light cover plate has a first plate body made of stainless steel and a second plate body made of aluminum, on the one hand, it can ensure that the light cover plate has better structural strength and use safety, and on the other hand, it can also ensure the connection strength and stability between the light cover plate and the aluminum explosion-proof valve by welding the second plate body and the aluminum explosion-proof valve, thereby effectively enhancing the durability, reliability and safety stability of the battery top cover.

[0020] Another object of the present utility model is to provide a battery that can improve the use safety and stability.

[0021] To achieve this purpose, the present utility model adopts the following technical solutions:

[0022] The battery includes a housing, an electric core and the above-mentioned battery top cover. The electric core is placed in the housing, the housing has an opening, and the battery top cover seals the opening.

[0023] The beneficial effects of the battery provided by the present utility model: The battery includes a housing, an electric core and the above-mentioned battery top cover, where the electric core is placed in the housing, the housing has an opening, and the battery top cover seals the opening. Since the battery adopts the above-mentioned battery top cover, the structure of the battery also has the beneficial effects of improving the welding stability of the explosion-proof valve and improving the use safety and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an exploded structural view of the light cover plate provided in the first embodiment of the present utility model;

[0025] Figure 2 is a top view of the first plate body provided in the first embodiment of the present utility model;

[0026] Figure 3 is a top view of the second plate body provided in the first embodiment of the present utility model;

[0027] Figure 4 is a structural view of the first plate body provided in the first embodiment of the present utility model;

[0028] Figure 5 is an exploded view of the battery top cover provided in the first embodiment of the present utility model;

[0029] Figure 6 is an exploded structural view of the light cover plate provided in the second embodiment of the present utility model.

[0030] In the figure:

[0031] 100, Aluminum explosion-proof valve; 200, terminal post; 300, pressing block; 400, upper plastic part; 500, lower plastic part; 600, sealing ring;

[0032] 1. First plate body; 11. Explosion-proof ventilation hole; 12. Through hole; 13. Limit groove;

[0033] 2. Second plate body; 21. Ventilation hole. Specific embodiments

[0034] The following will further elaborate on the present utility model in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely for explaining the present utility model and not for limiting it. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", "left", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] The following refers to Figures 1 to 6 Describe the specific structure of the optical cover plate of the embodiment of the present utility model.

[0039] The utility model discloses an optical cover plate, which is applied to a battery top cover. The battery top cover further includes an explosion-proof valve installed on the optical cover plate. It should be noted in advance that the explosion-proof valve provided by the utility model is an aluminum explosion-proof valve 100, which has better stability and controllability.

[0040] Embodiment 1

[0041] In this embodiment, referring to Figure 1 as shown, the optical cover plate includes a first plate body 1 and a second plate body 2. The first plate body 1 is connected to the second plate body 2, and the second plate body 2 is arranged at the bottom of the first plate body 1. The first plate body 1 is made of stainless steel, and the second plate body 2 is made of aluminum. The second plate body 2 is used for welding and connecting the aluminum explosion-proof valve 100.

[0042] It can be understood that the first plate body 1, as the main part of the optical cover plate, is made of stainless steel, which can ensure that the optical cover plate has high structural strength, strong impact resistance and good safety performance. On this basis, the optical cover plate is welded and connected to the aluminum explosion-proof valve 100 through the aluminum second plate body 2. Since the material of the second plate body 2 is the same as that of the aluminum explosion-proof valve 100, the situation of deformation or cracking at the welding part caused by different welding materials and large differences in thermophysical properties can be avoided, thus ensuring the welding stability between the optical cover plate and the aluminum explosion-proof valve 100, and effectively improving the stable reliability of the connection between the optical cover plate and the aluminum explosion-proof valve 100.

[0043] Furthermore, in this embodiment, the first plate body 1 and the second plate body 2 are integrally formed by stamping, which can reduce the number of parts used for connecting the first plate body 1 and the second plate body 2, such as screws, welding points, etc., thereby reducing the assembly complexity between the two, making the structure of the entire optical cover plate more stable and reliable, and contributing to the stable welding between the second plate body 2 and the aluminum explosion-proof valve 100.

[0044] Still further, in this embodiment, the projected area of the second plate body 2 on the horizontal plane is smaller than the projected area of the first plate body 1 on the horizontal plane, which can save the consumables of the second plate body 2, make the volume ratio of the first plate body 1 in the optical cover plate larger, and effectively improve the structural strength of the optical cover plate by increasing the consumable ratio of the first plate body 1.

[0045] Exemplarily, in combination with Figure 2 and Figure 3As shown, in this embodiment, explosion-proof ventilation holes 11 and through holes 12 are provided on the first plate body 1. The through hole 12 communicates with the inside of the battery. Along the length direction of the optical cover plate, the distance between the axis of the explosion-proof ventilation hole 11 and the through hole 12 is set as h1, and the distance between the end of the second plate body 2 and the center of the second plate body 2 is set as h2. The relationship between h1 and h2 satisfies the formula: h1 > h2. That is to say, on the second plate body 2, except for the ventilation holes 21 for the aluminum explosion-proof valve 100 to ventilate, no other holes are provided to cooperate with the through hole 12 so that the inside of the battery can communicate with the outside through the optical cover plate. Therefore, this can effectively simplify the structure of the second plate body 2, so that only the ventilation holes 21 are provided on the second plate body 2, which helps to maintain the overall structural integrity of the second plate body 2, avoiding the problem of uneven material strength distribution caused by too many holes, and thus effectively improving the welding strength and stability between the second plate body 2 and the aluminum explosion-proof valve 100.

[0046] Preferably, in this embodiment, the through hole 12 is a liquid injection hole, which can completely eliminate other holes on the second plate body 2 except the ventilation holes 21, greatly improving the material strength of the second plate body 2.

[0047] Furthermore, in this embodiment, a limiting groove 13 is provided at the bottom of the first plate body 1. The second plate body 2 is embedded in the limiting groove 13, and the bottom surface of the second plate body 2 is horizontally flush with the bottom surface of the first plate body 1. In this way, it can prevent the second plate body 2 from protruding from the bottom surface of the first plate body 1, resulting in an increase in the height space occupied by the entire optical cover plate, saving the height space of the optical cover plate, which minimizes the external dimensions of the battery using this optical cover plate, contributing to the compactness of the battery and obtaining a higher energy density.

[0048] Preferably, in this embodiment, the horizontal cross-sectional shape of the second plate body 2 is square. The second plate body 2 with a square cross-section is easier to form compared to the second plate body 2 with other cross-sectional shapes such as circular, oval, trapezoidal, triangular, etc., and is more common in the actual production process, which can effectively reduce the manufacturing pressure on the staff and production equipment, thus effectively improving the production efficiency of the second plate body 2, and also contributing to the mass production of the second plate body 2 and improving production consistency.

[0049] Of course, in other embodiments, the cross-sectional shape of the second plate body 2 can also be selected as other cross-sectional shapes according to the needs of customers. Therefore, the cross-sectional shape of the second plate body 2 in the present invention is not limited.

[0050] This embodiment also provides a battery top cover, as Figure 5As shown in the figure, it includes an aluminum explosion-proof valve 100, a pole terminal 200, a pressing block 300, an upper plastic part 400, a lower plastic part 500, a sealing ring 600 and a light cover plate. Among them, the aluminum explosion-proof valve 100 is welded at the middle position of the light cover plate. Pole holes are provided at both ends of the light cover plate. The pole passes through the pole holes. The sealing ring 600 is sleeved on the pole and fitted in the pole holes. The part of the pole passing upward through the pole hole is connected to the pressing block 300. The pressing block 300 can increase the area at the upper end of the pole, thus facilitating the connection between the pole and the external cable and ensuring that the battery can stably output electric energy. In addition, an upper plastic part 400 is clamped between the pressing block 300 and the light cover plate. The lower plastic part 500 is fixedly arranged at the bottom of the light cover plate. The upper plastic part 400 can ensure the insulation between the pressing block 300 and the light cover plate, and the lower plastic part 500 can ensure the insulation between the bottom end of the pole and the light cover plate, thus ensuring complete insulation between the entire pole and the light cover plate and avoiding the occurrence of the phenomenon that the light cover plate is charged.

[0051] It should be noted that the battery top cover provided in this embodiment includes two pole terminals 200. Two pole holes are provided on the light cover plate, and each pole hole is used to install a pole terminal 200. One of the pole terminals 200 is a positive pole terminal, and the other pole terminal 200 is a negative pole terminal. Correspondingly, there are two sealing rings 600, upper plastic parts 400 and pressing blocks 300 respectively to be connected to the positive pole terminal and the negative pole terminal.

[0052] It should also be noted that the battery top cover adopts the light cover plate provided in the above content of this embodiment. Since the above light cover plate has a first plate body 1 made of stainless steel and a second plate body 2 made of aluminum, on the one hand, it can ensure that the light cover plate has better structural strength and use safety, and on the other hand, it can also ensure the connection strength and stability between the light cover plate and the aluminum explosion-proof valve 100 through the welding of the second plate body 2 and the aluminum explosion-proof valve 100, so that the durability, reliability and safety stability of the battery top cover are effectively enhanced.

[0053] This embodiment also provides a battery, which includes a housing, an electric core and the above battery top cover. The electric core is placed in the housing, and the housing has an opening, and the battery top cover seals the opening. Since this battery adopts the above battery top cover, the structure of this battery also has the beneficial effects of improving the welding stability of the explosion-proof valve and improving the use safety stability.

[0054] Embodiment Two

[0055] The purpose of this embodiment is to provide a light cover plate, and the structure of this light cover plate is substantially the same as that of the light cover plate provided in Embodiment One, the difference lies in:

[0056] In the optical cover provided in this embodiment, the projected area of the second plate 2 on a horizontal plane is equal to the projected area of the first plate 1 on a horizontal plane. This allows for a balanced weight distribution across the optical cover by designing the first and second plates 1 and 2 to be identical in size, thereby helping to avoid structural instability caused by uneven weight. Furthermore, when the first and second plates 1 and 2 have identical dimensions, the production process can be simplified, reducing processing errors and the difficulty of aligning the two.

[0057] It can be understood that in this embodiment, a via 12 is also provided on the second plate body 2. When the via 12 is a liquid injection hole, it can ensure that the electrolyte can be injected into the battery through the light cover; when the via 12 is a pole hole, it can ensure that the pole terminal 200 can pass through and be installed on the light cover.

[0058] Throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Light cover, used on batteries, characterized by: The optical cover comprises a first plate body (1) and a second plate body (2), wherein the first plate body (1) is connected to the second plate body (2), and the second plate body (2) is arranged at the bottom of the first plate body (1), the first plate body (1) is a stainless steel part, and the second plate body (2) is an aluminum part, and the second plate body (2) is used for welding and connecting to the aluminum explosion-proof valve (100).

2. The optical cover according to claim 1, wherein: The projection area of the second plate (2) on the horizontal plane is smaller than the projection area of the first plate (1) on the horizontal plane.

3. The optical cover according to claim 1, wherein: The projected area of the second plate (2) on the horizontal plane is equal to the projected area of the first plate (1) on the horizontal plane.

4. The optical cover according to claim 2, wherein: The first plate (1) is provided with an explosion-proof vent hole (11) and a through hole (12), the through hole (12) being connected to the interior of the battery. Along the length direction of the light cover, the distance between the axis of the explosion-proof vent hole (11) and the through hole (12) is set to h1, and the distance between the end of the second plate (2) and the center of the second plate (2) is set to h2, where h1>h2.

5. The optical cover according to claim 4, wherein: The through hole (12) is a liquid injection hole.

6. The optical cover according to claim 2, wherein: A limiting groove (13) is provided at the bottom of the first plate body (1), the second plate body (2) is embedded in the limiting groove (13), and the bottom surface of the second plate body (2) is horizontally flush with the bottom surface of the first plate body (1).

7. The optical cover according to any one of claims 1 to 6, characterized in that: The horizontal cross-section of the second plate (2) is square.

8. The optical cover according to any one of claims 1 to 6, characterized in that: The first plate body (1) and the second plate body (2) are integrally formed by stamping.

9. Battery top cover, characterized in that, The optical cover comprises the optical cover according to any one of claims 1 to 8.

10. A battery, characterized in that The battery comprises a shell, a battery cell and the battery top cover according to claim 9, wherein the battery cell is placed in the shell, the shell is provided with an opening, and the battery top cover is sealed at the opening.

Images