Cover plate assembly and battery

Abstract

The utility model provides a cover plate subassembly and battery, the cover plate subassembly includes cover plate, insulator and confluence disc, insulator is provided the one side of cover plate, insulator middle part is provided with first avoidance mouth, confluence disc includes connecting portion, bending portion and body portion, connecting portion is provided the first avoidance mouth and is connected with cover plate, and the body portion is provided with bending portion and body portion. The body part is close to the connecting part through the bending part; a liquid injection hole is formed in the middle of the cover plate, and a second receding opening used for receding the liquid injection hole is formed in the middle of the connecting part. According to the cover plate assembly, a pole in an original structure is omitted, so that the whole structure is simple, the number of whole parts is reduced, and the assembly process is convenient and rapid; the thickness of the bending part can be increased, so that the body part is in full contact with the battery cell, the use of materials is reduced, and the influence on the welding with the tab due to an overlarge bending R angle of the convergence plate can be avoided; as the liquid injection hole is formed in the middle of the cover plate, the alignment operation of a liquid injection procedure can be omitted, and the production efficiency is improved while liquid injection is facilitated.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover assembly and a battery. Background Art

[0002] Existing cylindrical batteries use poles for both the positive and negative poles. Since the poles require a separate fixed structure, additional fixings are needed to fix the poles. This results in the cover assembly itself having a large number of parts and a complex structure, which is not conducive to assembly. The assembly process may also cause the structural position to shift, resulting in the battery not meeting production standards. In addition, since the poles occupy the center position of the top cover, the injection hole of the top cover is set in other areas of the top cover. This requires rotating the battery during injection so that the injection hole and the electrolyte output port are aligned before injection can be performed, which affects production efficiency.

[0003] In view of this, it is necessary to design a cover assembly to solve the above problems. Utility Model Content

[0004] In view of this, in order to overcome the defects of the prior art, the utility model provides a cover plate assembly and a battery, which effectively solves the problem that the existing cylindrical batteries have a large number of overall parts and a complex structure due to the use of poles, which is not conducive to assembly. In addition, the liquid injection hole is set in other areas of the top cover, which requires rotating the battery during liquid injection, and the liquid injection hole and the electrolyte output port must be aligned before liquid injection can be carried out, thereby affecting production efficiency.

[0005] According to the first aspect of the present invention, a cover plate assembly is provided, wherein the cover plate assembly includes a cover plate, an insulating member and a busbar, the insulating member is arranged on one side of the cover plate, and a first avoidance opening is opened in the middle of the insulating member, the busbar includes a connecting portion, a bending portion and a main body portion, the connecting portion is arranged at the first avoidance opening and connected to the cover plate, the bending portion can be bent, and when the cover plate assembly is assembled, the main body portion is close to the connecting portion through the bending portion; a liquid injection hole is provided in the middle of the cover plate, and a second avoidance opening for avoiding the liquid injection hole is provided in the middle of the connecting portion.

[0006] Preferably, a step portion is further provided between the connecting portion and the bent portion, and the height of the step portion matches the height of the first avoidance opening, so that the bent portion can be provided on a side of the insulating member away from the cover plate.

[0007] Preferably, the cover plate assembly also includes an explosion-proof valve, the cover plate is provided with a mounting groove, the mounting groove is arranged on one side of the liquid injection hole, the explosion-proof valve is arranged in the mounting groove, and the insulating part is provided with a third avoidance port for avoiding the explosion-proof valve, and the third avoidance port is arranged on one side of the first avoidance port.

[0008] Preferably, the thickness of the bent portion and the thickness of the connecting portion are both smaller than the thickness of the main body.

[0009] Preferably, the bending portion includes at least one bending point, and the at least one bending point is arranged between the connecting portion and the main body portion, and the main body portion is close to the connecting portion through the at least one bending point.

[0010] Preferably, the bending portion includes a first bending point, and the main body is bent once at the first bending point to approach the connecting portion.

[0011] Preferably, the bending portion includes a first bending point and a second bending point, and the main body portion is bent twice at the first bending point and the second bending point to approach the connecting portion.

[0012] Preferably, a boss is provided on a side of the insulating member away from the cover plate, and when the cover plate assembly is assembled, the main body abuts against the boss.

[0013] Preferably, a raised portion is provided in the middle of a side of the cover plate close to the insulating member, the injection hole is provided in the raised portion, and the size of the raised portion matches the size of the second avoidance opening.

[0014] According to a second aspect of the present invention, a battery is provided, wherein the battery includes the cover plate assembly as described above.

[0015] According to the cover plate assembly of the present invention, the poles in the original structure are eliminated through the combination of the cover plate, the insulating part and the busbar, so that the overall structure is simple, the number of overall parts is reduced, and the assembly process is convenient and fast; the bending part of the busbar can be used to increase the thickness, so that the main body and the battery cell are fully in contact, the use of materials is reduced, and at the same time, it can also avoid the excessive bending R angle of the busbar affecting the welding with the pole ear; since the injection hole is set in the middle of the cover plate, the alignment operation of the injection process can be omitted, which facilitates injection and improves production efficiency.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a cover plate assembly according to a first embodiment of the present utility model is shown;

[0019] Figure 2 An exploded view of a cover plate assembly according to a first embodiment of the present invention is shown;

[0020] Figure 3 An axonometric view of a cover plate assembly according to a first embodiment of the present invention is shown;

[0021] Figure 4 A schematic diagram showing a bending process according to a first embodiment of the present invention;

[0022] Figure 5 A schematic structural diagram of a cover plate assembly according to a second embodiment of the present invention is shown;

[0023] Figure 6 An exploded view of a cover plate assembly according to a second embodiment of the present invention is shown;

[0024] Figure 7 A schematic structural diagram of a second embodiment of the present invention before bending is shown;

[0025] Figure 8 A schematic diagram of the structure after bending according to the second embodiment of the present utility model is shown;

[0026] Figure 9 A schematic diagram showing a bending process according to a second embodiment of the present invention is shown.

[0027] Figure markings: 1-cover plate; 101-liquid injection hole; 102-installation groove; 103-raised portion; 104-limiting hole; 2-insulating part; 201-first avoidance port; 202-third avoidance port; 203-boss; 3-collector plate; 301-connecting portion; 302-bending portion; 303-main body; 304-second avoidance port; 305-step portion; 306-first bending point; 307-second bending point; 308-connecting hole; 4-explosion-proof valve. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0029] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the product of the application is usually placed when in use. 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 orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0031] In the description of the embodiments of the present application, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] According to a first aspect of the present invention, a cover plate assembly is provided, such as Figures 1 to 9 As shown, the cover plate assembly is used for cylindrical batteries and includes a cover plate 1, an insulating member 2 and a busbar 3.

[0033] In the following description, reference will be made to Figures 1 to 9 The detailed structures of the cover plate 1 , the insulating member 2 and the busbar 3 of the cover plate assembly are described in detail.

[0034] like Figures 1 to 3 and Figures 5 to 8 As shown, in this embodiment, an insulating member 2 is disposed on one side of the cover plate 1, specifically near the battery cells, to provide insulation and securement. The insulating member 2 can be, for example, a lower plastic. A first clearance opening 201 is defined in the middle of the insulating member 2. The first clearance opening 201 is used to limit the position of the busbar 3.

[0035] The busbar 3 may include a connecting portion 301, a bending portion 302 and a main body 303. The connecting portion 301 is provided at the first avoidance opening 201 and is connected to the cover plate 1. The connection method may be, for example, welding, and welding may be performed by laser welding commonly used in battery technology. The welding area may be provided at the connecting portion 301. By welding, the connecting portion 301 is directly connected to the cover plate 1. The pole, as well as the sealing ring, upper plastic, pressure plate and other components that cooperate with the pole can be eliminated, thereby reducing the number of components and reducing manufacturing costs. The bending portion 302 can be bent. When the cover plate assembly is assembled, the main body 303 is close to the connecting portion 301 through the bending portion 302. The busbar 3 may be formed into an L-shaped structure (such as Figure 1 As shown) or long strip structures (as Figure 6 As shown in FIG, during assembly, the bent portion 302 can be bent to bring the main body 303 closer to the connecting portion 301. This allows the main body 303 to be connected to the battery cell. In addition, the bending of the bent portion 302 can increase the thickness of the busbar 3, thereby allowing the busbar 3 to fully contact the battery cell and reduce material usage.

[0036] The cover plate 1 has an injection hole 101 in the center, and the connecting portion 301 has a second clearance opening 304 in the center to avoid the injection hole 101. The second clearance opening 304 cooperates with the injection hole 101 to facilitate electrolyte injection. Since the injection hole 101 is located in the center of the cover plate 1, it facilitates injection, eliminating alignment steps during the injection process and improving production efficiency.

[0037] As can be understood, the cover plate assembly itself has a simple structure, a small number of parts, and the busbar 3 can be directly welded to the cover plate 1, making assembly quick and easy. The bent portion 302 of the busbar 3 increases its thickness, ensuring full contact between the main body 303 and the battery cell, reducing material usage and preventing excessive bending angles of the busbar 3 from interfering with the tab welding. Since the injection hole 101 is located in the middle of the cover plate 1, alignment during the injection process is eliminated, facilitating injection while improving production efficiency.

[0038] Preferably, if Figures 1 to 3 and Figures 5 to 8As shown, in this embodiment, a step portion 305 is further provided between the connecting portion 301 and the bent portion 302. The height of the step portion 305 matches the height of the first avoidance opening 201. Since the busbar 3 has a certain thickness, in order to ensure that the first avoidance opening 201 can limit the connecting portion 301, the step portion 305 is provided to avoid the height of the first avoidance opening 201 and to avoid interference. This allows the bent portion 302 to be positioned on the side of the insulating member 2 away from the cover plate 1, leaving space for subsequent bending operations.

[0039] Preferably, if Figures 1 to 3 and Figures 5 to 8 As shown, in an embodiment, the cover plate assembly may further include an explosion-proof valve 4. The cover plate 1 defines a mounting groove 102, which is located on one side of the liquid injection hole 101. The explosion-proof valve 4 is disposed in the mounting groove 102. The insulating member 2 defines a third escape opening 202 for circumventing the explosion-proof valve 4. The third escape opening 202 is located on one side of the first escape opening 201. The cover plate 1 defines a mounting groove 102, such as a straight slot, for mounting the explosion-proof valve 4. The mounting method may be welding, for example. The insulating member 2 may define a third escape opening 202, such as a straight slot, for circumventing the explosion-proof valve 4.

[0040] Preferably, if Figures 1 to 3 and Figures 5 to 8 As shown, in this embodiment, the thickness of the bent portion 302 and the thickness of the connecting portion 301 are both thinner than the thickness of the main body 303. To facilitate bending of the main body 303, the thickness of the bent portion 302 needs to be reduced for easier assembly. To facilitate connection between the cover plate 1 and the busbar 3, the thickness of the connecting portion 301 needs to be reduced for easier welding.

[0041] Preferably, if Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, in the embodiment, the cover plate 1 is further provided with a limiting hole 104, which is arranged on both sides of the injection hole 101. The limiting hole 104 can be interference fit with the connecting protrusion of the insulating member 2 (not shown due to angle reasons) to achieve the fixation of the cover plate 1 and the insulating member 2.

[0042] Preferably, if Figures 1 to 3 and Figures 5 to 8 As shown in the embodiment, a boss 203 is provided on the side of the insulating member 2 away from the cover plate 1. When the cover plate assembly is assembled, the body portion 303 abuts against the boss 203. The boss 203 extends toward the location of the busbar 3. A boss 203 is provided on both sides of the insulating member 2 to ensure a stable abutment of the body portion 303 and thus a stable connection between the body portion 303 and the battery cell. Due to the provision of the boss 203, in the case of Figure 3 and Figure 8After assembly, there is sufficient space between the main body 303 and the insulating member 2 to retain some electrolyte and maintain an air chamber for explosion protection. In addition, when the main body 303 is overlapped with the boss 203, the main body 303 can be parallel to the kneading plane, preventing the bend R angle of the busbar 3 from being too large, which would affect the welding of the tabs to the main body 303.

[0043] Preferably, if Figures 1 to 3 and Figures 5 to 8 As shown, in the embodiment, a protrusion 103 is provided in the middle of one side of the cover plate 1 close to the insulating member 2 , the injection hole 101 is provided in the middle of the protrusion 103 , and the size of the protrusion 103 matches the size of the second avoidance opening 304 .

[0044] Preferably, in the embodiment, the bending portion 302 includes at least one bending point, and the at least one bending point is provided between the connecting portion 301 and the main body portion 303, and the main body portion 303 is close to the connecting portion 301 through the at least one bending point. Thus, according to the number of the bending points, the present application provides two different embodiments, namely Figures 1 to 4 The first embodiment shown and Figures 5 to 9 In the second embodiment shown, the number of bends in the first embodiment is one, and the number of bends in the second embodiment is two. Both embodiments include the features described above, and the difference lies in that the structure of the busbar 3 is different due to the different number of bends. Figures 1 to 4 and Figures 5 to 9 These two embodiments are described separately.

[0045] like Figures 1 to 4 As shown in the first embodiment, the bending portion 302 includes a first bending portion 306, and the main body 303 is bent once through the first bending portion 306 to approach the connecting portion 301. The busbar 3 can be formed as an L-shaped component, and the connection point of the L-shaped component is the first bending portion 306. Figure 4 As shown, after welding the connection portion 301 of the busbar 3 to the cover plate 1, the main body 303 can be brought closer to the connection portion 301 by bending the first bend 306, and finally overlapped with the boss 203 of the insulating member 2. In the first embodiment, the busbar 3 can be brought into contact with the battery cell with a single bend, which reduces the number of assembly steps and the difficulty of assembly, as well as the overall thickness and volume of the cover plate assembly.

[0046] like Figures 5 to 9As shown, in the second embodiment, the bend portion 302 may include a first bend 306 and a second bend 307, and the main body 303 is bent twice at the first bend 306 and the second bend 307 to approach the connecting portion 301. The busbar 3 may be formed into an elongated structure including two bends with opposite bending directions, so that the main body 303 of the busbar 3 can approach the connecting portion 301 and ultimately overlap the boss 203 of the insulating member 2. In the second embodiment, the busbar 3 is brought into contact with the battery cell by two bends. Since the thickness of the busbar 3 is increased by the two bends, sufficient space can be reserved in the insulating member 2 for some electrolyte, while increasing the contact area with the battery cell and reducing material usage.

[0047] The assembly process of the cover plate assembly is as follows: the cover plate 1 is welded to the explosion-proof valve 4 through the mounting groove 102, the cover plate 1 and the insulating part 2 are connected by interference fit through the limiting hole 104, and the third avoidance port 202 of the insulating part 2 is used to avoid the explosion-proof valve 4. The connection portion 301 of the busbar 3 is clamped in the first avoidance port 201 of the insulating part 2, and contacts the cover plate 1 to achieve welding. According to the number of bends, the bend portion 302 is bent so that the main body 303 overlaps the boss 203. A connecting hole 308 is provided in the middle of the main body 303, and the connecting hole 308 is concentric with the liquid injection hole 101 of the cover plate 1. Since the liquid injection hole 101 is provided in the middle of the cover plate 1, the liquid injection operation can be performed directly, eliminating the alignment operation of the liquid injection process.

[0048] The cover plate assembly eliminates the poles in the original structure through the combination of the cover plate, the insulating part and the busbar, making the overall structure simple, reducing the number of overall parts, and making the assembly process convenient and quick; the bent portion of the busbar can be used to increase the thickness, achieve full contact between the main body and the battery cell, reduce the use of materials, and also avoid the excessive bending R angle of the busbar affecting the welding with the pole ear; since the injection hole is set in the middle of the cover plate, the alignment operation of the injection process can be omitted, which facilitates injection and improves production efficiency.

[0049] Furthermore, according to a second aspect of the present invention, a battery is provided, comprising the above-described cover plate assembly. During the production process of this battery, the number of parts in the cover plate is reduced, thereby saving costs and enabling a faster and more convenient overall assembly process, reducing overall manufacturing difficulty. Furthermore, since alignment operations during the injection process are eliminated, production efficiency can be improved.

[0050] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly includes a cover plate, an insulating member, and a busbar. The insulating member is provided on one side of the cover plate. A first avoidance opening is provided in the middle of the insulating member. The busbar includes a connecting portion, a bent portion, and a main body. The connecting portion is provided at the first avoidance opening and connected to the cover plate. The bent portion is bendable. When the cover plate assembly is assembled, the main body is close to the connecting portion through the bent portion. A liquid injection hole is provided in the middle of the cover plate, and a second avoidance opening for avoiding the liquid injection hole is provided in the middle of the connecting portion.

2. The cover plate assembly according to claim 1, wherein: A step portion is further provided between the connecting portion and the bent portion, and the height of the step portion matches the height of the first avoidance opening, so that the bent portion can be provided on a side of the insulating member away from the cover plate.

3. The cover plate assembly according to claim 1, wherein: The cover plate assembly also includes an explosion-proof valve. The cover plate is provided with a mounting groove, which is arranged on one side of the liquid injection hole. The explosion-proof valve is arranged in the mounting groove. The insulating member is provided with a third avoidance port for avoiding the explosion-proof valve, and the third avoidance port is arranged on one side of the first avoidance port.

4. The cover plate assembly according to claim 1, wherein: The thickness of the bent portion and the thickness of the connecting portion are both smaller than the thickness of the main body.

5. The cover plate assembly according to claim 1, wherein: The bending portion includes at least one bending point, and the at least one bending point is arranged between the connecting portion and the main body portion. The main body portion is close to the connecting portion through the at least one bending point.

6. The cover plate assembly according to claim 5, wherein: The bending portion includes a first bending point, and the main body is bent once at the first bending point to approach the connecting portion.

7. The cover plate assembly according to claim 5, wherein: The bending portion includes a first bending point and a second bending point, and the main body is bent twice at the first bending point and the second bending point to approach the connecting portion.

8. The cover plate assembly according to claim 1, wherein: A boss is provided on a side of the insulating member away from the cover plate. When the cover plate assembly is assembled, the main body abuts against the boss.

9. The cover plate assembly according to claim 1, wherein: A convex portion is provided in the middle of one side of the cover plate close to the insulating member, the injection hole is provided in the convex portion, and the size of the convex portion matches the size of the second avoidance opening.

10. A battery, characterized in that: The battery includes the cap plate assembly according to any one of claims 1 to 9.

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