Battery cell cover plate, battery cell and battery

Abstract

The utility model discloses a battery cell cover plate, a battery cell and a battery. The battery cell cover plate comprises a body part and a sealing part, the body part is provided with a mounting groove, and at least one liquid injection hole is formed in the bottom of the mounting groove. At least one part of the sealing part is located in the mounting groove to seal the liquid injection hole, the sealing part has an initial state and an expansion state, and when the sealing part is in the initial state, the minimum distance between the outer side face of the sealing part and the groove wall of the mounting groove is a first distance. When the sealing piece is pressed to change from the initial state to the expansion state, the minimum distance between the outer side face of the sealing piece and the groove wall of the mounting groove is a second distance, and the first distance is larger than the second distance. By adopting the technical scheme, the sealing performance of the battery cell cover plate can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a cell cover, a cell, and a battery. Background Technology

[0002] A battery cell is the core component of a battery, often referred to as a battery cell or battery chip, and is the basic unit for energy conversion in a battery system. The primary function of a battery cell is to store and release electrical energy through chemical reactions, and its performance directly affects the overall performance and lifespan of the battery. The cell cover typically has an injection hole to provide a channel for injecting electrolyte. To effectively prevent electrolyte leakage after injection and to avoid foreign objects such as welding slag and metal particles falling into the cell, which could lead to short circuits or other safety hazards, sealing pins are usually installed at the injection hole.

[0003] In related technologies, after the sealing pin is inserted into the corresponding injection hole, the gap between the sealing pin and the wall of the injection hole is relatively large, which leads to poor sealing at the injection hole of the cell cover. Utility Model Content

[0004] In view of this, this application provides a cell cover, a cell, and a battery, which can improve the sealing performance of the cell cover.

[0005] In a first aspect, embodiments of this application provide a battery cell cover plate, the battery cell cover plate including a body component and a sealing component;

[0006] The main body has a mounting groove, and the bottom of the mounting groove is provided with at least one liquid injection hole;

[0007] At least a portion of the seal is located within the mounting groove to seal the injection hole. The seal has an initial state and an expanded state. When the seal is in the initial state, the minimum distance between the outer surface of the seal and the wall of the mounting groove is a first distance. When the seal is compressed and changes from the initial state to the expanded state, the minimum distance between the outer surface of the seal and the wall of the mounting groove is a second distance. The first distance is greater than the second distance.

[0008] The gap between the outer surface of the seal and the wall of the mounting groove is suitable for filling with solder.

[0009] Optionally, the seal includes a main body and a bent portion;

[0010] The periphery of the main body is connected to the bent portion;

[0011] The bent portion extends away from the main body and bends upward. When the main body is pressed, it can push the bent portion outward to expand, thereby reducing the minimum distance between the outer side of the bent portion and the wall of the mounting groove.

[0012] Optionally, the vertical distance between the top surface of the main body and the top surface of the body component is a third distance;

[0013] The distance between the end face of the bent portion away from the main body and the top surface of the body component is the fourth distance, and the third distance is greater than the fourth distance.

[0014] Optionally, the main body has a groove with an opening facing the injection hole, and the inner sidewall of the groove has a chamfer near the top of the groove.

[0015] Optionally, the bent portion includes a first part and a second part connected together;

[0016] One side of the first part is connected to the periphery of the main body near the injection hole, and the other side is connected to the second part;

[0017] The second portion extends away from the body component, and the second portion gradually moves away from the axial direction of the body component in the direction from the injection hole to the seal.

[0018] Optionally, the bottom surface of the first portion is parallel to and abuts against the portion of the bottom of the mounting groove where the injection hole is not provided.

[0019] Optionally, the side of the second portion facing the injection hole includes a first surface and a second surface;

[0020] The first surface is connected to the bottom surface of the first part and forms an angle with the bottom surface of the first part;

[0021] The second surface is connected to the first surface and is parallel to the wall of the mounting groove.

[0022] Optionally, the diameter of the main body is larger than the diameter of the injection hole.

[0023] Secondly, embodiments of this application also provide a battery cell, the battery cell including the battery cell cover plate described in any one of the embodiments of the first aspect of this application.

[0024] Thirdly, embodiments of this application also provide a battery, the battery including the cell cover plate described in any one of the embodiments of the first aspect of this application, or the battery including the cell described in the embodiments of the second aspect of this application.

[0025] The battery cell cover provided in this embodiment includes a body and a seal. At least a portion of the seal is located within the mounting groove of the body to seal the injection hole at the bottom of the mounting groove. Since the seal can change from an initial state to an expanded state under pressure, the distance between the outer surface of the seal and the groove wall decreases from a first distance to a second distance. In other words, after the seal is compressed, the gap between the seal and the groove wall can be reduced, thus reducing the assembly gap between the seal and the groove wall. Therefore, when welding the seal to the groove wall, the solder only needs to fill a small gap, which helps improve the welding yield, thereby ensuring the sealing at the injection hole and improving the overall sealing performance of the battery cell cover. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a battery cell cover provided in an embodiment of this application;

[0028] Figure 2 This is an exploded view and a partial enlarged view of a battery cell cover provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a sealing element in a battery cell cover provided in an embodiment of this application;

[0030] Figure 4 This is a top view of a sealing element in a battery cell cover provided in an embodiment of this application;

[0031] Figure 5 This is a cross-sectional schematic diagram of a sealing element in a battery cell cover provided in an embodiment of this application.

[0032] Figure label:

[0033] 100. Main body; 110. Mounting groove; 111. Injection hole; 112. Tank wall; 113. Tank bottom;

[0034] 200, Seal; 210, Main body; 220, Bending part; 211, Groove; 212, Chamfer; 221, First part; 222, Second part; 2111, Inner wall; 2221, First surface; 2222, Second surface;

[0035] 300. Shell.

[0036] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] In the embodiments of this application, directional terms such as "upper," "lower," and "side" are generally used in the following ways: Figure 1 The relative positions shown are based on established rules, and these directional terms are used merely to more clearly describe the structures and their relationships, not to describe absolute positions. Positions may change when the product is placed in different orientations; for example, "up" and "down" may be interchanged. Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art.

[0039] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0040] Combination Figure 1 and Figure 2 As shown, this application embodiment provides a battery cell cover plate, which includes a body 100 and a sealing element 200. It should be noted that the sealing element 200 in this application embodiment can be made of aluminum.

[0041] The main body 100 has a mounting groove 110, and the bottom 113 of the mounting groove 110 is provided with at least one injection hole 111.

[0042] At least a portion of the seal 200 is located within the mounting groove 110 to seal the injection hole 111. The seal 200 has an initial state and an expanded state. When the seal 200 is in the initial state, the minimum distance between the outer surface of the seal 200 and the groove wall 112 of the mounting groove 110 is a first distance. When the seal 200 is compressed and changes from the initial state to the expanded state, the minimum distance between the outer surface of the seal 200 and the groove wall 112 of the mounting groove 110 is a second distance, and the first distance is greater than the second distance. It should be noted that the minimum distance between the outer surface of the seal 200 and the groove wall 112 of the mounting groove 110 refers to the radial distance between the nearest point on the outer surface of the seal 200 to the groove wall 112 of the mounting groove 110. The second distance is 0 or close to 0, for example, 0, 0.01 mm, etc.

[0043] The gap between the outer surface of the sealing element 200 and the groove wall 112 of the mounting groove 110 is suitable for filling with solder.

[0044] It should be noted that when the seal 200 is compressed, the gap between the seal 200 and the groove wall 112 of the mounting groove 110 can be reduced, which means the assembly gap between the seal 200 and the groove wall 112 of the mounting groove 110 can be reduced. Therefore, when welding the seal 200 to the groove wall 112 of the mounting groove 110, the solder only needs to fill the small gap, which helps to improve the welding yield, thereby ensuring the sealing of the injection hole 111, and further improving the sealing of the cell cover.

[0045] The following is in conjunction with the appendix Figures 1 to 5 The details and functions of the cell cover plate provided in the embodiments of this application will be described in more specific and detailed manner.

[0046] Combination Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the seal 200 includes a main body 210 and a bent portion 220. The periphery of the main body 210 is connected to the bent portion 220. The bent portion 220 extends away from the main body 210 and bends upward. When the main body 210 is pressed, it can push the bent portion 220 outward to expand, thereby reducing the minimum distance between the outer surface of the bent portion 220 and the wall 112 of the mounting groove 110. With this configuration, the surface of the bent portion 220 facing away from the injection hole 111 and the outer surface of the main body 210 can form the shape of an annular groove 211. When the seal 200 is loaded or placed into the mounting groove 110, this annular groove 211 facilitates the assembly personnel or identification equipment to quickly identify whether the seal 200 is correctly placed. This avoids situations such as ineffective welding or repeated assembly caused by the seal 200 being placed upside down, thereby improving both the welding yield and the assembly efficiency of the cell cover.

[0047] CombinationFigure 3 and Figure 5 As shown, in some embodiments, the vertical distance between the top surface of the main body 210 and the top surface of the body component 100 is a third distance. The distance between the end face of the bent portion 220 away from the main body 210 and the top surface of the body component 100 is a fourth distance, and the third distance is greater than the fourth distance. It should be noted that before the seal 200 is welded to the body component 100, the body component 100 is first placed in the mounting groove 110. Then, a pressing device is generally provided above the main body 210. When the pressing device moves downward, the pressing surface of the pressing device will contact the top surface of the main body 210 and press down on the main body 210, so that the main body 210 can push the bent portion 220 outward after being pressed. Since the top surface of the main body 210 is higher than the end face of the bent portion 220, it is possible to avoid the pressing surface of the pressing device contacting the end face of the bent portion 220 and damaging the bent portion 220, ensuring that the bent portion 220 can expand and deform only under the thrust of the main body 210.

[0048] Combination Figure 2 and Figure 5 As shown, in some embodiments, the main body 210 has a groove 211 with an opening facing the injection hole 111, and the inner wall 2111 of the groove 211 has a chamfer 212 near the top of the groove 211. This arrangement allows the main body 210 to better stretch and deform under pressure, thereby better pushing the bent portion 220 to expand outward, and thus reducing the gap between the bent portion 220 and the groove wall 112 of the mounting groove 110.

[0049] Combination Figure 2 and Figure 5 As shown, in some embodiments, the bent portion 220 includes a first portion 221 and a second portion 222 connected together. One side of the first portion 221 is connected to the periphery of the main body portion 210 near the injection hole 111, and the other side is connected to the second portion 222. The second portion 222 extends away from the main body 100, and the second portion 222 gradually moves away from the axial direction of the main body portion 210 in the direction from the injection hole 111 to the seal 200. That is, the second portion 222 forms an angle with the axial direction, which is more conducive to the expansion of the bent portion 220 by the pushing of the main body portion 210.

[0050] Combination Figure 2 and Figure 5 As shown, in some embodiments, the bottom surface of the first portion 221 is parallel to and abuts against the portion of the bottom 113 of the mounting groove 110 that does not have an injection hole 111. This arrangement prevents the seal 200 from tilting or leaning after it is placed in the mounting groove 110, improving pre-assembly accuracy, avoiding repeated assembly, increasing assembly efficiency, and ensuring that the pressing surface of the subsequent pressing device can press the main body 210 more smoothly.

[0051] Combination Figure 2 and Figure 5 As shown, in some embodiments, the side of the second portion 222 facing the injection hole 111 includes a first surface 2221 and a second surface 2222. The first surface 2221 is connected to the bottom surface of the first portion 221 and forms an angle with the bottom surface of the first portion 221. The second surface 2222 is connected to the first surface 2221 and is parallel to the groove wall 112 of the mounting groove 110. It should be noted that when the bent portion 220 expands, the minimum distance between the second surface 2222 and the groove wall 112 of the mounting groove 110 decreases from a first distance to a second distance, that is, the gap between the seal 200 and the groove wall 112 of the mounting groove 110 decreases. Since the second surface 2222 is parallel to the groove wall 112 of the mounting groove 110, when the seal 200 and the groove wall 112 of the mounting groove 110 are filled with solder, the contact area between the solder and the second surface 2222 can be increased, thereby increasing the stability of the weld between the seal 200 and the groove wall 112 of the mounting groove 110, which in turn can improve the welding yield and thus improve the sealing performance of the cell cover.

[0052] Combination Figure 2 and Figure 5 As shown, in some embodiments, the diameter of the main body 210 is larger than the diameter of the injection hole 111. This arrangement ensures that the seal 200 completely covers the injection hole 111, thereby improving the sealing performance of the cell cover.

[0053] In summary, the battery cell cover provided in this application embodiment allows the sealing element 200, used to seal the injection hole 111, to expand outward under pressure. Therefore, before welding the sealing element 200 to the wall 112 of the mounting groove 110 of the body component 100, the gap between the sealing element 200 and the wall 112 of the mounting groove 110 can be minimized, thereby improving the welding yield and ultimately enhancing the sealing performance of the battery cell cover. Simultaneously, since the weld size can be reduced by pressing down on the sealing element 200 before welding to allow it to expand and deform, the fit between the sealing element 200 and the wall 112 of the mounting groove 110 is increased. This reduces the gap requirement between the sealing element 200 and the wall 112 of the mounting groove 110 during the initial material preparation, thus not increasing the dimensional tolerance control burden of the sealing element and improving the welding yield. In addition, the concave shape of the upper surface of the seal 200 formed by the bending portion 220 and the main body portion 210 improves the recognizability of the seal 200 and makes it easier to identify the accuracy of the placement of the seal 200, that is, it is easier to identify whether the seal 200 is placed backwards, reducing the misjudgment rate and improving assembly efficiency. It can also improve the accuracy of welding, thereby reducing the scrap rate of the battery cell cover due to poor welding.

[0054] like Figure 1As shown, in a second aspect, embodiments of this application also provide a battery cell, which includes the battery cell cover plate of any one of the embodiments of the first aspect of this application. It should be noted that the battery cell cover plate provided in this application has the same composition and function as the battery cell cover plate described in any one of the embodiments of this application, therefore, it will not be described again here. Because the battery cell cover plate has a high welding yield and high sealing performance, the battery cell with the battery cell cover plate installed also has high sealing performance.

[0055] In some embodiments, the battery cell further includes a housing 300, which is fastened to a battery cell cover to form a sealed cavity for accommodating the wound core. Because the battery cell cover has high sealing performance, impurities can be prevented from entering the sealed cavity, thereby ensuring the stability of the battery cell's performance.

[0056] Thirdly, embodiments of this application also provide a battery, which includes the cell cover plate of any one of the embodiments of the first aspect of this application, or the battery includes the cell of the embodiments of the second aspect of this application. It should be noted that the battery provided in this application embodiment may include one, two, or more connected cells. The cell cover plate in the battery provided in this application embodiment has the same composition and function as the cell cover plate of any one of the embodiments of this application, therefore, it will not be described again here. It should be understood that because the cell cover plate has a high welding yield and good sealing performance, the battery with the cell cover plate installed also has a high assembly yield and better sealing performance, thereby ensuring the stability of battery performance.

[0057] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0058] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery cell cover plate, characterized in that, The cell cover plate includes a body component (100) and a sealing component (200). The body component (100) has a mounting groove (110), and the bottom (113) of the mounting groove (110) is provided with at least one liquid injection hole (111). At least a portion of the seal (200) is located within the mounting groove (110) to seal the injection hole (111). The seal (200) has an initial state and an expanded state. When the seal (200) is in the initial state, the minimum distance between the outer surface of the seal (200) and the groove wall (112) of the mounting groove (110) is a first distance. When the seal (200) is compressed and changes from the initial state to the expanded state, the minimum distance between the outer surface of the seal (200) and the groove wall (112) of the mounting groove (110) is a second distance. The first distance is greater than the second distance. The gap between the outer side of the seal (200) and the groove wall (112) of the mounting groove (110) is suitable for filling with solder.

2. The cell cover plate according to claim 1, characterized in that, The sealing element (200) includes a main body (210) and a bent portion (220). The periphery of the main body (210) is connected to the bent portion (220); The bent portion (220) extends away from the main body (210) and bends upward. When the main body (210) is pressed, it can push the bent portion (220) to expand outward, thereby reducing the minimum distance between the outer side of the bent portion (220) and the groove wall (112) of the mounting groove (110).

3. The cell cover plate according to claim 2, characterized in that, The vertical distance between the top surface of the main body (210) and the top surface of the body component (100) is the third distance; The distance between the end face of the bent portion (220) away from the main body portion (210) and the top surface of the body member (100) is the fourth distance, and the third distance is greater than the fourth distance.

4. The cell cover plate according to claim 2, characterized in that, The main body (210) has a groove (211) with an opening facing the injection hole (111), and the inner wall (2111) of the groove (2111) has a chamfer (212) near the top of the groove (211).

5. The cell cover plate according to claim 2, characterized in that, The bent portion (220) includes a first part (221) and a second part (222) connected together; One side of the first part (221) is connected to the periphery of the main body (210) near the injection hole (111), and the other side is connected to the second part (222); The second portion (222) extends away from the body (100) and gradually moves away from the axial direction of the body (210) in the direction from the injection hole (111) to the seal (200).

6. The cell cover plate according to claim 5, characterized in that, The bottom surface of the first part (221) is parallel to and abuts against the part of the bottom (113) of the mounting groove (110) where the injection hole (111) is not provided.

7. The cell cover plate according to claim 5, characterized in that, The side of the second part (222) facing the injection hole (111) includes a first surface (2221) and a second surface (2222). The first surface (2221) is connected to the bottom surface of the first part (221) and forms an angle with the bottom surface of the first part (221); The second surface (2222) is connected to the first surface (2221) and is parallel to the groove wall (112) of the mounting groove (110).

8. The cell cover plate according to claim 2, characterized in that, The diameter of the main body (210) is larger than the diameter of the injection hole (111).

9. A battery cell, characterized in that, The battery cell includes the battery cell cover plate according to any one of claims 1 to 8.

10. A battery, characterized in that, The battery includes the cell cover plate according to any one of claims 1 to 8, or the battery includes the cell according to claim 9.

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