Battery cell cover plate for power battery and battery cell

Abstract

The utility model relates to a battery cell cover plate for a power battery and a battery cell, and belongs to the technical field of batteries. The pole columns are arranged in the mounting holes in the two sides of the cover plate body and connected with the bottom of the pressing ring in a seam welding mode, a traditional riveting-welding procedure is replaced, and the length of a process chain is reduced; and by combining the structures of the upper and lower plastic insulating parts, the sealing ring and the explosion-proof valve, the height of the pole is optimized, the processing cost is reduced while the sealing performance and the safety are ensured, and the energy density and the production efficiency of the battery are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cell cover plate and a cell for a power battery. Background Technology

[0002] With the development of technology in the field of new energy battery manufacturing, electrode connection technology has emerged.

[0003] In related technologies, the electrode post and the riveting block need to be riveted together before welding to form a multi-connection structure. However, the above-mentioned traditional riveting and welding methods have problems such as a long process chain (requiring two independent processes of riveting and welding), limited height of the outer electrode post, and high processing costs of the positive and negative electrode posts (the positive electrode requires CNC machining which has the risk of burrs, and the negative electrode relies on the complex copper-aluminum friction welding process), which seriously restrict the efficiency of improving battery energy density and large-scale production. Summary of the Invention

[0004] Therefore, it is necessary to provide a cell cover plate and a cell for power batteries to address the above problems, thereby reducing riveting processes, lowering the height of the terminals, and improving production efficiency.

[0005] A cell cover for a power battery, comprising:

[0006] The cover plate body includes mounting holes formed on both sides of the cover plate body;

[0007] An electrode post is disposed in the mounting hole, and the bottom of the electrode post is connected to the pressure ring;

[0008] The first insulating member and the second insulating member are located on both sides of the cover plate body thickness direction along the circumferential direction of the mounting hole; and

[0009] A seal is disposed between the second insulating element and the cover plate body.

[0010] In one embodiment, the contact end between the bottom of the pole and the pressure ring is connected by seam welding.

[0011] In one embodiment, the terminal post includes a positive terminal post and a negative terminal post, which are respectively disposed in mounting holes on both sides; the pressure ring includes a positive pressure ring and a negative pressure ring, which cooperate with the positive terminal post and the negative terminal post respectively; the cell cover plate also includes an exhaust hole opened on the cover plate body and a pressure relief component disposed on the exhaust hole.

[0012] In one embodiment, the height of the pole post is 5.1mm to 6.6mm, preferably less than 6.6mm, such as 5.1mm, 5.2mm, etc.; the height of the pole post protruding from the cover plate body after being assembled into the mounting hole is 2mm to 3.2mm, preferably less than 3.2mm, such as 2mm, 2.5mm, etc.; the thickness of the pressure ring is 1.2mm to 1.5mm, preferably less than 1.5mm, such as 1.2mm, 1.3mm, etc.

[0013] In one embodiment, the pressure relief component includes an explosion-proof valve patch and an explosion-proof valve, the explosion-proof valve patch covering the vent hole and the explosion-proof valve disposed below the vent hole.

[0014] In one embodiment, the cover plate body is configured as a light aluminum sheet structure.

[0015] In one embodiment, the first insulating element is an upper plastic and the second insulating element is a lower plastic, the upper plastic and the lower plastic being located on the upper and lower sides of the cover plate body, respectively.

[0016] In one embodiment, the thickness of the upper plastic is 0.8 mm to 1 mm, preferably less than 1 mm, such as 0.8 mm, 0.9 mm, etc.; the thickness of the lower plastic is 1.2 mm to 1.5 mm, preferably less than 1.5 mm, such as 1.2 mm, 1.3 mm, etc.

[0017] In one embodiment, the seal is configured as a sealing ring structure fitted onto the outer wall of the pole post.

[0018] On the other hand, this application also provides a battery cell, including the battery cell cover plate for a power battery as described above.

[0019] The aforementioned cell cover and cell for power batteries reduce the process chain length and eliminate the traditional process of riveting the terminals with riveting blocks and then welding them. This application directly uses seam welding to connect the terminals and the pressure ring, eliminating the riveting process, thereby simplifying the process chain and improving production efficiency. In addition, the height of the terminals protruding from the cover body after being assembled into the mounting hole is 2mm to 3.2mm, preferably less than 3.2mm, which solves the problem of limited external terminal height in the prior art. While ensuring performance, reducing the height of the terminals helps to improve the energy density of the battery.

[0020] This application also has the following advantages:

[0021] This application effectively improves the sealing performance of the cell cover plate through the synergistic effect of the first insulating component, the second insulating component, and the sealing ring structure sleeved on the outer wall of the electrode post. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of one embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the structure under an explosive state in one embodiment of this application.

[0024] Figure 3 This is a cross-sectional structural diagram of one embodiment of this application.

[0025] Figure 4 for Figure 3 Enlarged schematic diagram of part A in the middle.

[0026] Wherein: 100, cover plate body; 200, mounting hole; 300, pole post; 400, pressure ring; 500, first insulating component; 600, second insulating component; 700, sealing component; 800, vent hole; 900, pressure relief component; 1000, bottom seam weld area;

[0027] 910, Explosion-proof valve patch; 920, Explosion-proof valve. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] like Figures 1 to 4 As shown, this application provides a cell cover for a power battery, including a cover body 100, mounting holes 200, terminals 300, pressure rings 400, a first insulating component 500, a second insulating component 600, a sealing component 700, a vent hole 800, a pressure relief component 900, and a bottom welded area 1000. The cell cover of this application simplifies the process chain and improves the battery energy density and safety by optimizing the terminal connection method and the insulation and sealing structure.

[0035] Please refer to the following: Figures 1 to 2 In some embodiments, the cover plate body 100 is an integral structure formed by stamping of a light aluminum sheet, which has the characteristics of high strength and lightweight.

[0036] Please make mounting holes 200 symmetrically on both sides of the cover plate body 100 (e.g. Figure 2 As shown), it is used to accommodate the pole post 300; a first insulating element 500 and a second insulating element 600 are respectively provided on both sides of the cover plate body 100 in the thickness direction to provide electrical insulation and mechanical support;

[0037] Furthermore, the first insulating component 500 is an upper plastic, and the second insulating component 600 is a lower plastic.

[0038] In some embodiments, a vent 800 is formed on the cover body 100, and a pressure relief component 900 covers its outer side. The pressure relief component 900 includes an explosion-proof valve patch 910 and an explosion-proof valve 920. The explosion-proof valve patch 910 is covered on the outer side above the vent 800 by a hot-pressing process, and the explosion-proof valve 920 is disposed below the vent. When the internal pressure of the battery is abnormal, the explosion-proof valve 920 ruptures to release gas and avoid the risk of explosion.

[0039] Please continue reading. Figure 2 The mounting hole 200 penetrates the cover plate body 100, and its inner wall is clearance-fitted with the pole post 300; the pole post 300 includes a positive pole post and a negative pole post, which are respectively disposed in the mounting holes 200 on both sides;

[0040] The bottom of the terminal post 300 extends below the mounting hole 200 and is fixed to the pressure ring 400 by seam welding through the bottom seam welding area 1000; furthermore, the height of the terminal post is 5.1mm to 6.6mm, preferably less than 6.6mm, such as 5.1mm, 5.2mm, etc.; after the terminal post is assembled into the mounting hole, the height of the protrusion of the cover plate body is 2mm to 3.2mm, preferably less than 3.2mm, such as 2mm, 2.5mm, etc.; the thickness of the pressure ring is 1.2mm to 1.5mm, preferably less than 1.5mm, such as 1.2mm, 1.3mm, etc., thereby reducing the overall structural height and thus improving the battery energy density;

[0041] Furthermore, the pressure ring 400 includes a positive pressure ring and a negative pressure ring, which are respectively sleeved on the outer side of the bottom of the electrode post 300; furthermore, the thickness of the pressure ring 400 is 1.2mm to 1.5mm.

[0042] Please see Figure 3 The first insulating component 500 (upper plastic) and the second insulating component 600 (lower plastic) are located on the upper and lower sides of the cover plate body 100, respectively, and are distributed circumferentially along the mounting hole 200;

[0043] Furthermore, the thickness of the upper plastic is 0.8mm to 1mm, preferably less than 1mm, such as 0.8mm, 0.9mm, etc.; the thickness of the lower plastic is 1.2mm to 1.5mm, preferably less than 1.5mm, such as 1.2mm, 1.3mm, etc.

[0044] In some embodiments, the sealing element 700 is a silicone sealing ring sleeved on the outer wall of the electrode post 300, located between the second insulating element 600 and the cover plate body 100, and achieves electrolyte sealing through compression deformation to prevent leakage.

[0045] Please see Figure 4 The contact end between the pressure ring 400 and the pole post 300 forms a bottom seam weld area 1000 through a seam welding process; this design replaces the traditional riveting-welding process, directly achieving a reliable connection through seam welding, reducing processes and eliminating the hidden dangers of riveting burrs.

[0046] In practice, the assembly process of this application is as follows:

[0047] The first insulating component 500, the second insulating component 600, and the sealing component 700 are arranged in sequence. The pole post 300 is inserted into the mounting hole 200 so that the bottom of the pole post 300 is aligned with the pressure ring 400, ensuring that the pole post 300 is insulated and sealed from the cover plate body 100.

[0048] The pole post 300 and the pressure ring 400 are welded in the bottom seam welding area 1000 by seam welding process;

[0049] Attach the pressure relief component 900 to the outside of the vent 800 to complete the cell cover assembly;

[0050] The cover plate body 100 is welded to the cell shell to form a complete cell structure.

[0051] This application eliminates the traditional riveting process by seaming the terminal post 300 and the pressure ring 400, shortening the process chain and improving production efficiency. At the same time, the height of the terminal post 300 is controlled between 2mm and 3.2mm, which, together with the pressure ring 400, significantly reduces the overall thickness of the cover plate and improves the battery energy density. In addition, this application ensures airtightness through the synergistic effect of the upper and lower plastic insulating parts and the sealing ring. The pressure relief part 900 provides a rapid release channel in case of abnormal pressure, improving safety.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A cell cover for a power battery, characterized in that, include: The cover plate body includes mounting holes formed on both sides of the cover plate body; An electrode post is disposed in the mounting hole, and the bottom of the electrode post is connected to the pressure ring; The first insulating member and the second insulating member are located on both sides of the cover plate body thickness direction along the circumferential direction of the mounting hole; and A seal is disposed between the second insulating element and the cover plate body.

2. The cell cover plate for a power battery according to claim 1, characterized in that, The contact end between the bottom of the pole and the pressure ring is connected by seam welding.

3. The cell cover plate for a power battery according to claim 2, characterized in that, The electrode post includes a positive electrode post and a negative electrode post, which are respectively disposed in the mounting holes on both sides; The pressure ring includes a positive pressure ring and a negative pressure ring, which are respectively engaged with the positive terminal and the negative terminal. The cell cover plate also includes an exhaust hole formed on the cover plate body, and a pressure relief component disposed on the exhaust hole.

4. The cell cover plate for a power battery according to claim 2, characterized in that, The height of the pole post is 5.1mm to 6.6mm, and the height of the pole post protruding from the cover plate body after being assembled into the mounting hole is 2mm to 3.2mm. The thickness of the pressure ring is 1.2mm to 1.5mm.

5. The cell cover plate for a power battery according to claim 3, characterized in that, The pressure relief component includes an explosion-proof valve patch and an explosion-proof valve. The explosion-proof valve patch covers the top of the vent hole, and the explosion-proof valve is located below the vent hole.

6. The cell cover plate for a power battery according to claim 1, characterized in that, The main body of the cover plate is made of aluminum sheet.

7. The cell cover plate for a power battery according to claim 1, characterized in that, The first insulating component is an upper plastic, and the second insulating component is a lower plastic, with the upper and lower plastics located on the upper and lower sides of the cover plate body, respectively.

8. The cell cover plate for a power battery according to claim 7, characterized in that, The thickness of the upper plastic is 0.8 mm to 1 mm, and the thickness of the lower plastic is 1.2 mm to 1.5 mm.

9. The cell cover plate for a power battery according to claim 1, characterized in that, The sealing element is configured as a sealing ring structure fitted onto the outer wall of the pole post.

10. A battery cell, characterized in that, Includes the cell cover plate for power batteries as described in any one of claims 1-9.

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