Lower plastic assembly of battery, cover plate assembly, battery and photovoltaic equipment

Abstract

The utility model provides a lower plastic component of a battery, a cover plate component, the battery and photovoltaic equipment. The lower plastic component comprises first lower plastic, a second lower plastic and a third lower plastic, a receding opening is formed in a plate body of the first lower plastic, and the receding opening is used for receding a mounting space of an anti-explosion valve of a battery; the second lower plastic cement is detachably arranged at the avoiding opening of the first lower plastic cement and used for covering the anti-explosion valve at the avoiding opening, and a first air hole corresponding to the anti-explosion valve is formed in the second lower plastic cement. By changing the structure of the lower plastic and optimizing the lower plastic into the split type lower plastic assembly, when the cover plate is manufactured, after the first lower plastic is welded through ultrasonic waves, the explosion-proof valve is welded to the receding opening of the first lower plastic, and finally the second lower plastic is installed, so that in the ultrasonic welding process, due to the fact that no explosion-proof valve is arranged on the cover plate, the explosion-proof valve is welded to the receding opening of the first lower plastic, and the explosion-proof valve is welded to the receding opening of the second lower plastic; therefore, the anti-explosion valve cannot be damaged.

Description

Technical Field

[0001] The utility model relates to the technical field related to photovoltaic energy storage, and in particular to a lower plastic component of a battery, a cover plate component, a battery and a photovoltaic device. Background Art

[0002] In the relevant technology, power batteries and energy storage batteries are the two major scenarios for the application of battery technology. Energy storage batteries correspond to equipment such as solar energy, while power batteries correspond to new energy vehicles. The packaging types of power batteries are mainly divided into three forms: cylindrical, square and soft pack. Intuitively, their differences are only in shape, but at the same time they are also different in terms of technology development and application. Among them, square batteries have stronger plasticity and can be customized according to the specific needs of the products they carry. At the same time, they also lead to different sizes. At present, no matter the manufacturing process or application standards, there is no clear standard division like cylindrical batteries. But precisely because of its high flexibility, it has been used for a long time in early new energy vehicles. Car companies can customize the size of square batteries according to vehicle model requirements without being restricted by cylindrical battery standards. Square batteries were once considered to be the most suitable battery design for new energy vehicle applications.

[0003] Currently, one of the methods for fixing the lower plastic of square batteries is to use ultrasonic welding of the lower plastic, so that the lower plastic is melted and then cooled and fixed. However, when using ultrasonic welding for fixing, the high-frequency mechanical vibration generated by welding may damage the residual thickness area of ​​the battery cell explosion-proof valve, thereby causing leakage of the explosion-proof valve. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a lower plastic component, a cover component, a battery and a photovoltaic device for a battery, so as to solve the technical problem in the prior art that the residual thickness area of ​​the battery cell explosion-proof valve will be damaged during the ultrasonic welding of the lower plastic, thereby causing leakage of the explosion-proof valve.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a lower plastic component of a battery, the lower plastic component comprising:

[0007] A first lower plastic, wherein a evacuation opening is provided on a plate body of the first lower plastic, and the evacuation opening is used to evacuate an installation space of an explosion-proof valve of the battery;

[0008] The second lower plastic is detachably arranged at the avoidance opening of the first lower plastic, and is used to cover the explosion-proof valve at the avoidance opening, wherein the second lower plastic is provided with a first vent hole corresponding to the explosion-proof valve.

[0009] According to some embodiments of the present application, a portion of the second lower plastic corresponding to the explosion-proof valve is recessed toward a side away from the explosion-proof valve to form a breathable cover;

[0010] Wherein, the first ventilation hole is arranged on the ventilation cover.

[0011] According to some embodiments of the present application, a second air vent is formed on the first lower plastic, and the second air vent passes through the plate body of the first lower plastic and corresponds to the explosion-proof valve.

[0012] According to some embodiments of the present application, the avoidance opening is a rectangular opening; and the second lower plastic is a rectangular plate structure adapted to the avoidance opening.

[0013] According to some embodiments of the present application, the first lower plastic and the second lower plastic are snap-connected or riveted.

[0014] According to some embodiments of the present application, a card slot is provided at the edge of the avoidance opening of the first lower plastic, and a card platform is formed at the edge of the second lower plastic.

[0015] The first lower plastic and the second lower plastic are clamped together by the clamping slot and the clamping platform.

[0016] According to some embodiments of the present application, a rivet head is provided at the edge of the avoidance opening of the first lower plastic, and a rivet hole is provided at the edge of the second lower plastic.

[0017] The first lower plastic and the second lower plastic are clamped together by the cooperation of the rivet head and the rivet hole.

[0018] In a second aspect, the present application provides a cover plate assembly of a battery, the cover plate assembly comprising:

[0019] roof;

[0020] An explosion-proof valve disposed on the top plate;

[0021] And the lower plastic component described in any embodiment of the present application, wherein the lower plastic component is arranged on the inner side of the top plate and corresponds to the explosion-proof valve.

[0022] In a third aspect, the present application provides a battery, comprising: a cover assembly according to any embodiment of the present application.

[0023] In a fourth aspect, the present application provides a photovoltaic device, comprising: a battery according to any embodiment of the present application.

[0024] In the above technical solution, a lower plastic assembly is provided, which is optimized into a split lower plastic assembly by changing the lower plastic structure, including a first lower plastic and a second lower plastic. In this way, when making the cover plate, the explosion-proof valve can be welded at the avoidance of the first lower plastic after ultrasonic welding of the first lower plastic, and finally the second lower plastic can be installed. In this way, during the ultrasonic welding process, the explosion-proof valve will not be damaged because there is no explosion-proof valve on the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is an exploded view of a cover plate assembly according to an exemplary embodiment;

[0027] Figure 2 is a schematic diagram of an explosion-proof valve according to an exemplary embodiment;

[0028] Figure 3 is a schematic diagram of a lower plastic component of a snap-on connection according to an exemplary embodiment;

[0029] Figure 4 is a schematic diagram of a riveted lower plastic component according to an exemplary embodiment.

[0030] In the figure: 10, lower plastic component; 101, first lower plastic; 1011, avoidance; 1012, second air vent; 1013, rivet head; 102, second lower plastic; 1021, air cover; 10211, first air vent; 1022, rivet hole; 30, explosion-proof valve; 301, explosion area of ​​explosion-proof valve; 302, skirt of explosion-proof valve; 303, residual thickness of explosion-proof valve; 304, reinforcement rib of explosion-proof valve; 40, protective sheet; 50, pole. DETAILED DESCRIPTION

[0031] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0032] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0033] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0034] In the related art, one of the methods for fixing the lower plastic of the square battery is to use ultrasonic welding of the lower plastic, so that the lower plastic is melted and then cooled and fixed. However, when using ultrasonic welding for fixing, the high-frequency mechanical vibration generated by welding may damage the residual thickness area of ​​the explosion-proof valve of the battery cell, thereby causing leakage of the explosion-proof valve.

[0035] The present application provides a lower plastic assembly, which is optimized into a split lower plastic assembly by changing the lower plastic structure, including a first lower plastic and a second lower plastic. When making a cover plate, after ultrasonically welding the first lower plastic, an explosion-proof valve can be welded at the avoidance of the first lower plastic, and finally the second lower plastic can be installed. In this way, during the ultrasonic welding process, since there is no explosion-proof valve on the cover plate, the explosion-proof valve will not be damaged.

[0036] The technical solution of this embodiment is described in detail below in conjunction with the accompanying drawings. The following embodiments and implementation methods can be combined with each other if there is no conflict.

[0037] In an exemplary embodiment of the present utility model, a lower plastic component 10 of a battery is provided, such as Figure 1 , Figure 3-Figure 4 As shown, the lower plastic component 10 includes:

[0038] A first lower plastic 101, a plate body of the first lower plastic 101 is provided with an escape opening 1011, the escape opening 1011 is used to escape the installation space of the explosion-proof valve 30 of the battery;

[0039] The second lower plastic 102 is detachably disposed at the avoidance opening 1011 of the first lower plastic 101 , and is used to cover the explosion-proof valve 30 at the avoidance opening 1011 , wherein the second lower plastic 102 is provided with a first vent hole 10211 corresponding to the explosion-proof valve 30 .

[0040] Considering that ultrasonic welding is used for fixing, the high-frequency mechanical vibration generated during the process of welding the lower plastic and the top plate will damage the residual thickness 303 area of ​​the explosion-proof valve of the battery, causing the explosion-proof valve 30 to leak. Figure 2 As shown, the explosion-proof valve 30 includes an explosion-proof valve skirt 302, an explosion-proof valve residual thickness 303, an explosion-proof valve reinforcement rib 304 and an explosion-proof valve bursting area 301, wherein the explosion-proof valve residual thickness 303 is about 0.08 mm in size, so it is very easy to be damaged during high-frequency vibration, thereby leaking.

[0041] In this exemplary embodiment, the lower plastic structure is optimized and designed as a split structure, including a first lower plastic 101 with a avoidance opening 1011 and a second lower plastic 102 installed at the avoidance opening 1011. When the lower plastic assembly 10 is welded to the top plate by ultrasonic welding, the first lower plastic 101 is first welded to the top plate; since the avoidance opening 1011 is provided at the installation position of the explosion-proof valve 30 corresponding to the top plate, the explosion-proof valve 30 is welded at this time; finally, the second lower plastic 102 is fixed at the avoidance opening 1011 corresponding to the first lower plastic 101. Based on the lower plastic assembly 10, the leakage of the explosion-proof valve 30 caused by ultrasonic welding of the cover assembly can be effectively solved, and the stability of the explosion-proof valve 30 is improved, thereby ensuring the safety of the battery cell.

[0042] In some exemplary embodiments, Figure 1 , Figure 3-Figure 4 As shown, the portion of the second lower plastic 102 corresponding to the explosion-proof valve 30 is recessed toward the side away from the explosion-proof valve 30 to form a breathable cover 1021. The breathable cover 1021 is provided with a first breathable hole 10211. Based on the design of the breathable cover 1021, on the one hand, after the second lower plastic 102 is assembled in the avoidance opening 1011, an avoidance space can still be formed to prevent the second lower plastic 102 from directly contacting the explosion-proof valve 30, and on the other hand, the two sides of the second lower plastic 102 can be connected through the first breathable hole 10211 to ensure the air pressure balance on both sides of the lower plastic assembly 10.

[0043] In some exemplary embodiments, Figure 1 , Figure 3-Figure 4 As shown, a second vent hole 1012 is opened on the first lower plastic 101 . The second vent hole 1012 passes through the plate of the first lower plastic 101 and corresponds to the explosion-proof valve 30 .

[0044] Considering that the first vent hole 10211 on the second lower plastic 102 may be blocked due to the expansion or displacement of the battery cell, the design of opening the second vent hole 1012 on the first lower plastic 101 can avoid the above situation, in which the pressure balance on both sides of the lower plastic component 10 cannot be maintained, and the explosion-proof valve 30 cannot play a protective role on the battery. Optionally, the second vent holes 1012 are distributed around the avoidance opening 1011.

[0045] In some exemplary embodiments, Figure 1-Figure 4 As shown, considering that the avoidance opening 1011 is provided for the installation of the explosion-proof valve 30 , based on the shape of the explosion-proof valve 30 , the avoidance opening 1011 in this exemplary embodiment is exemplarily a rectangular opening. Accordingly, the second lower plastic 102 is a rectangular plate structure adapted to the avoidance opening 1011 .

[0046] In some exemplary embodiments, Figure 1 , Figure 3-Figure 4 As shown, in order to facilitate the disassembly and assembly of the first lower plastic 101 and the second lower plastic 102 , in this exemplary embodiment, the first lower plastic 101 and the second lower plastic 102 are detachably connected by snap connection or riveting.

[0047] When the first lower plastic 101 and the second lower plastic 102 are connected by a snap-fit ​​method: for example, Figure 3 As shown, a card slot is provided at the edge of the avoidance opening 1011 of the first lower plastic 101, and a card platform is formed at the edge of the second lower plastic 102. This method is to clamp the first lower plastic 101 and the second lower plastic 102 together by cooperating with the card slot and the card platform. It should be noted that the position and size of the card platform and the card slot can be adjusted and designed according to actual needs, and the card slot can form a circle around the edge of the avoidance opening 1011. In this case, the card platform can be a multi-segment convex ridge structure corresponding to the card slot or a circle of continuous convex ridge structure.

[0048] In an alternative manner, a card platform may be provided at the edge of the avoidance opening 1011 of the first lower plastic 101 , and a card groove may be formed at the edge of the second lower plastic 102 .

[0049] When the first lower plastic 101 and the second lower plastic 102 are riveted: for example, Figure 4 As shown, a rivet head 1013 is provided at the edge of the avoidance opening 1011 of the first lower plastic 101, and a rivet hole 1022 is provided at the edge of the second lower plastic 102. The rivet head 1013 cooperates with the rivet hole 1022 to clamp the first lower plastic 101 and the second lower plastic 102 together. Further optionally, the rivet holes 1022 are evenly distributed along the edge of the second lower plastic 102, and the rivet heads 1013 are evenly distributed along the edge of the first lower plastic 101, wherein the positions and quantities of the rivet holes 1022 and the rivet heads 1013 are kept in one-to-one correspondence.

[0050] In an alternative manner, rivet holes may be provided at the edge of the avoidance opening 1011 of the first lower plastic 101, and rivet heads may be formed at the edge of the second lower plastic 102. In this manner, the number and position of the rivet holes and rivet heads are similar to those in the aforementioned manner, and will not be described in detail herein.

[0051] The present utility model also provides a battery cover assembly in an exemplary embodiment, such as Figure 1-Figure 4 As shown, the cover assembly includes: a top plate; an explosion-proof valve 30 disposed on the top plate; and any one of the lower plastic components 10 in the above embodiments, wherein the lower plastic component 10 is disposed on the inner side of the top plate and corresponds to the explosion-proof valve 30. The material of the top plate can be a plain aluminum sheet, etc., and the pole 50 is disposed on the top plate. In addition, to protect the explosion-proof valve 30, the cover assembly also includes: a protective sheet 40, which is disposed on the top plate and corresponds to the explosion-proof valve 30.

[0052] A battery is also provided in an exemplary embodiment of the utility model, and the battery comprises: any one of the cover plate assemblies in the above embodiments.

[0053] A photovoltaic device is also provided in an exemplary embodiment of the utility model. The photovoltaic device includes: any one of the batteries in the above embodiments.

[0054] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0055] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A lower plastic component of a battery, characterized in that: The lower plastic component comprises: A first lower plastic, wherein a evacuation opening is provided on a plate body of the first lower plastic, and the evacuation opening is used to evacuate an installation space of an explosion-proof valve of the battery; The second lower plastic is detachably arranged at the avoidance opening of the first lower plastic, and is used to cover the explosion-proof valve at the avoidance opening, wherein the second lower plastic is provided with a first vent hole corresponding to the explosion-proof valve.

2. The lower plastic component of the battery according to claim 1, characterized in that: The portion of the second lower plastic corresponding to the explosion-proof valve is recessed toward a side away from the explosion-proof valve to form a breathable cover; Wherein, the first ventilation hole is arranged on the ventilation cover.

3. The lower plastic component of the battery according to claim 2, characterized in that: The first lower plastic is provided with a second vent hole, which penetrates through the plate body of the first lower plastic and corresponds to the explosion-proof valve.

4. The lower plastic assembly of the battery according to claim 1, characterized in that: The avoidance opening is a rectangular opening; the second lower plastic is a rectangular plate structure adapted to the avoidance opening.

5. The lower plastic component of the battery according to any one of claims 1 to 4, characterized in that: The first lower plastic and the second lower plastic are connected by clamping or riveting.

6. The lower plastic assembly of the battery according to claim 5, characterized in that: The edge of the avoidance opening of the first lower plastic is provided with a card slot, and the edge of the second lower plastic forms a card platform. The first lower plastic and the second lower plastic are clamped together by the clamping slot and the clamping platform.

7. The lower plastic component of the battery according to claim 5, characterized in that: The edge of the avoidance opening of the first lower plastic is provided with a rivet head, and the edge of the second lower plastic is provided with a rivet hole. The first lower plastic and the second lower plastic are clamped together by the cooperation of the rivet head and the rivet hole.

8. A battery cover assembly, characterized in that: The cover plate assembly comprises: roof; An explosion-proof valve disposed on the top plate; And the lower plastic component according to any one of claims 1 to 7, wherein the lower plastic component is arranged on the inner side of the top plate and corresponds to the explosion-proof valve.

9. A battery, characterized in that: The battery comprises: the cover plate assembly as claimed in claim 8.

10. A photovoltaic device, characterized in that: The photovoltaic device comprises: the battery as claimed in claim 9.

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