Battery top cover structure

Abstract

The utility model belongs to battery technical field discloses a kind of battery top cover structure, the battery top cover structure includes top cover body, briquetting, pole and connecting ring, top cover body is used to cover and set at the opening of battery shell, briquetting is insulatedly connected to the side of top cover body away from battery shell, briquetting is equipped with assembly hole, the one end of assembly hole away from top cover body is equipped with flared portion, the aperture of flared portion is greater than the aperture of assembly hole, pole is worn in top cover body and assembly hole, the one end of pole away from battery shell is located in flared portion, connecting ring is located in flared portion, connecting ring can be hot melt and solidified and connect between pole and the inner wall of flared portion.The battery top cover structure can reduce the probability of deformation problem of pole and briquetting, is favorable to improve the reliability of upper plastic and sealing ring, is favorable to provide the security of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery top cover structure. Background Technology

[0002] A battery top cover typically includes a top cover body, an upper plastic layer, a pressure block, terminals, and a sealing ring. The upper plastic layer is located on the side of the top cover body away from the battery casing and is sandwiched between the top cover body and the pressure block. The terminals pass through the top cover body, the upper plastic layer, and the pressure block. The sealing ring is fitted onto the terminals and is clamped between the terminals and the wall of the through hole in the top cover body.

[0003] In existing technologies, laser welding is commonly used to weld the terminals and clamping blocks. Laser welding directly affects the terminals and clamping blocks, causing localized overheating. This can lead to slight deformation of the terminals and clamping blocks, especially the clamping blocks, reducing the dimensional accuracy of the side of the clamping block away from the top cover body. This is detrimental to the stable connection between the clamping block and the battery, and also reduces the flow rate between them. Furthermore, the heat from laser welding can be transferred to the upper plastic and sealing ring, leading to heat melting issues. In addition, laser welding is prone to producing weld holes and slag, seriously impacting battery safety.

[0004] Therefore, there is an urgent need to propose a battery top cover structure to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a battery top cover structure that reduces the probability of deformation of the terminals and pressure blocks, improves the reliability of the upper plastic and sealing ring, and enhances battery safety.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The battery top cover structure includes:

[0008] Top cover body, the top cover body is used to cover the opening of the battery case;

[0009] The pressure block is insulatedly connected to the side of the top cover body away from the battery case. The pressure block is provided with an assembly hole. The end of the assembly hole away from the top cover body is provided with a flared part. The diameter of the flared part is larger than the diameter of the assembly hole.

[0010] The terminal post is inserted into the top cover body and the assembly hole, with the end of the terminal post facing away from the battery case located inside the flared part.

[0011] A connecting ring is located inside the flared section. The connecting ring can be heat-melted and solidified to connect the pole post to the inner wall of the flared section.

[0012] Optionally, the edge of the assembly hole away from the top cover body is chamfered, and the area enclosed by the chamfer along the circumference of the assembly hole is a flared section.

[0013] Optionally, the chamfer angle is 45°.

[0014] Optionally, the length of the right-angled side of the chamfer is a, the inner diameter of the connecting ring is r1, the outer diameter of the connecting ring is r2, and the height of the connecting ring is b, where 0.8mm≤a≤1.2mm, 6mm≤r1≤6.5mm, 6.8mm≤r2≤7.2mm, and 0.8mm≤b≤1.2mm.

[0015] Optionally, the assembly hole is a stepped hole, and the large-diameter end of the stepped hole is a flared section.

[0016] Optionally, the connecting ring is heat-fused using a high-frequency welding process.

[0017] Optionally, the connecting ring is provided with a flux layer.

[0018] Optionally, the connecting ring is an aluminum ring.

[0019] Optionally, the connecting ring has a notch.

[0020] Optionally, a gap is left between the connecting ring and the inner wall of the flared part.

[0021] The beneficial effects of this utility model are:

[0022] A flared section is provided at the end of the assembly hole away from the top cover body. The ends of the connecting ring and the terminal post away from the battery casing are both located inside the flared section. When connecting the terminal post and the pressure block, the connecting ring is heat-melted and filled between the terminal post and the inner wall of the flared section. When the filler liquid between the terminal post and the inner wall of the flared section cools and solidifies, the connection between the terminal post and the inner wall of the flared section is formed. This battery top cover structure eliminates the laser welding process that directly acts on the terminal post and the pressure block. When the connecting ring is heat-melted, the heat is concentrated on the connecting ring, rather than on the terminal post and the pressure block. This reduces the probability of deformation of the terminal post and the pressure block due to localized overheating, which is beneficial to improving the dimensional accuracy of the terminal post and the pressure block. This, in turn, is beneficial to improving the stability of the connection between the pressure block and the plate, and also beneficial to improving the flow rate between the pressure block and the plate.

[0023] When the connecting ring is heat-fused, the heat is concentrated on the connecting ring rather than on the pole and the pressure block. This reduces the chance that the pole and the pressure block will transfer heat to the upper plastic and the sealing ring, which helps to improve the reliability of the upper plastic and the sealing ring.

[0024] The battery top cover structure eliminates the need for laser welding to connect the terminals and clamps, avoiding the problems of weld holes and slag, which helps improve battery safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the battery top cover structure provided in Embodiment 1 of this utility model;

[0026] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the pressure block provided in Embodiment 1 of this utility model;

[0028] Figure 4 This is a cross-sectional structural diagram of the pressure block provided in Embodiment 1 of this utility model;

[0029] Figure 5 This is a cross-sectional structural diagram of the battery top cover structure provided in Embodiment 1 of this utility model;

[0030] Figure 6 yes Figure 5 Enlarged view of a section at point B in the middle;

[0031] Figure 7 This is a schematic diagram of the connecting ring provided in Embodiment 1 of this utility model;

[0032] Figure 8 This is a cross-sectional structural diagram of the pressure block provided in Embodiment 2 of this utility model.

[0033] In the picture:

[0034] 100. Top cover body; 200. Pressing block; 210. Assembly hole; 211. Flared part; 212. Chamfer; 213. Stepped hole; 214. Stepped plane; 300. Pole post; 400. Connecting ring; 410. Notch; 500. Gap; 600. Upper plastic; 700. Sealing ring. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] Example 1

[0040] This embodiment provides a battery top cover structure that reduces the probability of deformation of the terminals and pressure blocks, improves the reliability of the upper plastic and sealing ring, and enhances battery safety.

[0041] Specifically, such as Figures 1 to 6As shown, the battery top cover structure includes a top cover body 100, a pressure block 200, a terminal post 300, and a connecting ring 400. The top cover body 100 is used to cover the opening of the battery case (not shown in the figure). The pressure block 200 is insulatedly connected to the side of the top cover body 100 away from the battery case. The pressure block 200 is provided with an assembly hole 210. The end of the assembly hole 210 away from the top cover body 100 is provided with a flared portion 211. The diameter of the flared portion 211 is larger than the diameter of the assembly hole 210. The terminal post 300 passes through the top cover body 100 and the assembly hole 210. The end of the terminal post 300 away from the battery case is located inside the flared portion 211. The connecting ring 400 is located inside the flared portion 211. The connecting ring 400 can be heat-melted and solidified between the terminal post 300 and the inner wall of the flared portion 211.

[0042] The battery top cover structure also includes an upper plastic 600 and a sealing ring 700. The upper plastic 600 is located on the side of the top cover body 100 facing away from the battery casing and is sandwiched between the top cover body 100 and the pressure block 200, thereby achieving an insulating connection between the pressure block 200 and the top cover body 100. The sealing ring 700 is sleeved on the terminal post 300 and clamped between the side wall of the terminal post 300 and the wall of the mounting hole of the top cover body 100, thereby achieving insulation and sealing between the terminal post 300 and the top cover body 100. The side of the pressure block 200 facing away from the top cover body 100 is used for welding and fixing to the electrode plate to achieve a conductive connection between the pressure block 200 and the electrode plate.

[0043] When connecting the terminal post 300 and the pressure block 200, the connecting ring 400 is heat-melted and filled between the terminal post 300 and the inner wall of the flared portion 211. The filling liquid between the terminal post 300 and the inner wall of the flared portion 211 then cools and solidifies to form a connection between the terminal post 300 and the inner wall of the flared portion 211 (not shown in the figure). This battery top cover structure eliminates the need for laser welding, which directly affects the terminal post 300 and the pressure block 200. When the connecting ring 400 is heat-melted, the heat is concentrated on the connecting ring 400, rather than on the terminal post 300 and the pressure block 200. This reduces the likelihood of deformation of the terminal post 300 and the pressure block 200 due to localized overheating, improves the dimensional accuracy of the terminal post 300 and the pressure block 200, enhances the stability of the connection between the pressure block 200 and the pressure plate, and also increases the flow rate between the pressure block 200 and the pressure plate.

[0044] When the connecting ring 400 is heat-fused, the heat is concentrated on the connecting ring 400, rather than on the pole post 300 and the pressure block 200. This reduces the chance that the pole post 300 and the pressure block 200 will transfer heat to the upper plastic 600 and the sealing ring 700, which helps to improve the reliability of the upper plastic 600 and the sealing ring 700.

[0045] The battery top cover structure eliminates the need for laser welding to connect the terminal post 300 and the pressure block 200, avoiding the problems of weld holes and welding slag, which helps to improve battery safety.

[0046] It should be noted that the inner wall of the flared portion 211 includes the inner side wall and the inner bottom wall of the flared portion 211. It is a preferred solution for the connecting ring 400 to be heat-melted and solidified between the pole post 300 and the inner side wall of the flared portion 211, and for the connecting ring 400 to be heat-melted and solidified between the pole post 300 and the inner bottom wall of the flared portion 211. This can make the connection stability between the pole post 300 and the pressure block 200 higher.

[0047] Furthermore, the connecting ring 400 is heat-fused using a high-frequency welding process. The high-frequency welding process has a small heat-affected zone, ensuring that heat is concentrated on the connecting ring 400. This means that the probability of heat transfer to the pole post 300 and the pressure block 200 is low. This not only further reduces the likelihood of heat deformation of the pole post 300 and the pressure block 200, providing further assurance for their dimensional accuracy, but also further reduces the probability of heat transfer to the upper plastic 600 and the sealing ring 700, providing further assurance for their reliability. Secondly, the high-frequency welding process has lower requirements for the cleanliness of the welding surface; therefore, the connecting ring 400 does not need to be cleaned before high-frequency welding, which helps improve production efficiency and reduce production costs.

[0048] It should be noted that high-frequency welding is a relatively mature production process in this field, and its specific principles and processes will not be elaborated here.

[0049] Furthermore, a gap 500 is left between the connecting ring 400 and the inner wall of the flared part 211, so that when the connecting ring 400 is welded at high frequency, the high frequency welding energy is more likely to be concentrated on the connecting ring 400 rather than on the pressure block 200, which further reduces the probability of the pressure block 200 being deformed by heat.

[0050] It should be noted that the inner wall of the aforementioned flared portion 211 includes the inner side wall and the inner bottom wall of the flared portion 211. In actual operation, a gap 500 can be left between the inner side wall of the flared portion 211 and the connecting ring 400, or a gap 500 can be left between the inner bottom wall of the flared portion 211 and the connecting ring 400, or both the inner side wall and the inner bottom wall of the flared portion 211 and the connecting ring 400 can have a gap 500. Among these, it is preferable that both the inner side wall and the inner bottom wall of the flared portion 211 and the connecting ring 400 have a gap 500, further reducing the probability of high-frequency welding energy concentrating on the pressure block 200.

[0051] Furthermore, the edge of the assembly hole 210 opposite to the top cover body 100 is chamfered 212, and the area enclosed by the chamfer 212 along the circumference of the assembly hole 210 is a flared portion 211. On the one hand, the manufacturing process of the chamfer 212 is relatively simple, which is beneficial to improving production efficiency and reducing production costs. On the other hand, after the connecting ring 400 is placed into the flared portion 211, the outer ring of the end of the connecting ring 400 facing the top cover body 100 is mounted on the inclined surface of the chamfer 212. That is to say, the connecting ring 400 and the pressure block 200 are in line contact. This structure significantly reduces the contact area between the connecting ring 400 and the pressure block 200, thereby reducing the heat transfer channel between the connecting ring 400 and the pressure block 200, which is beneficial to further reduce the probability of the pressure block 200 being deformed by heat when the connecting ring 400 is heat-fused.

[0052] It should be noted that in actual production, chamfer 212 can be prepared using processes commonly found in this field, such as stamping or cutting.

[0053] Furthermore, the chamfer 212 has an angle of 45°. Setting the chamfer 212 to 45° has two advantages. First, it reduces the manufacturing difficulty of the chamfer 212, thereby improving production efficiency and reducing production difficulty. Second, if the chamfer 212 is too large, a larger connecting ring 400 is required to fill the space between the side wall of the pole post 300 and the bevel of the chamfer 212 after the connecting ring 400 is melted, which will increase the cost of the connecting ring 400. If the chamfer 212 is too small, a slit is easily formed between the pole post 300 and the side of the chamfer 212 facing the top cover body 100. The filling liquid formed by the melting of the connecting ring 400 is not easy to flow to the slit, or it is difficult to completely fill the slit. After the filling liquid cools and solidifies, bubbles form in the unfilled areas. In other words, after the filling liquid cools and solidifies, there are unconnected areas between the pole post 300 and the pressure block 200, which reduces the yield of high-frequency welding.

[0054] Furthermore, the length of the right-angled side of chamfer 212 is 'a', 0.8mm ≤ a ≤ 1.2mm. For example, 'a' can be 0.8mm, 1mm, or 1.2mm, etc. The inner diameter of the connecting ring 400 is 'r1', 6mm ≤ r1 ≤ 6.5mm. For example, 'r1' can be 6mm, 6.25mm, or 6.5mm, etc. The outer diameter of the connecting ring 400 is 'r2', 6.8mm ≤ r2 ≤ 7.2mm. For example, 'r2' can be 6.8mm, 7mm, or 7.2mm, etc. The height of the connecting ring 400 is 'b', that is, the dimension of the connecting ring 400 in its axial direction is 'b', 0.8mm ≤ b ≤ 1.2mm. For example, 'b' can be 0.8mm, 1mm, or 1.2mm, etc. With the chamfer angle 212 set at 45°, the following parameters are ensured: 0.8mm≤a≤1.2mm, 6mm≤r1≤6.5mm, 6.8mm≤r2≤7.2mm, and 0.8mm≤b≤1.2mm. This ensures that the filling liquid after the connecting ring 400 is hot-melted will not overflow the flared part 211. This also prevents the connecting part formed by the cooling and solidification of the filling liquid from protruding from the pressure block 200, thus providing further assurance for the dimensional accuracy of the pressure block 200 (especially the dimensional accuracy of the pressure block 200 in the direction from the top cover body 100 to the pressure block 200).

[0055] Optionally, the connecting ring 400 is made of aluminum. Aluminum products are inexpensive and have a low melting point, which helps to reduce production costs and improve production efficiency.

[0056] Optionally, a flux layer (not shown in the figure) is provided on the connecting ring 400. Specifically, the inner ring surface, the outer ring surface, and the two end faces in the axial direction of the connecting ring 400 are all provided with flux layers. The flux layer can remove the oxide film in the welding area, reduce the surface tension of the liquid metal (i.e., the filling liquid formed by the hot melting of the connecting ring 400), protect the filling liquid from secondary oxidation, and improve the hot melting efficiency of the connecting ring 400. In turn, it can improve the connection efficiency between the pole post 300 and the pressure block 200, which is beneficial to improving production efficiency.

[0057] Furthermore, such as Figure 7 As shown, the connecting ring 400 has a notch 410. In actual production, the connecting ring 400 with the notch 410 can be directly formed from aluminum wire coils using a spring forming machine, enabling large-scale operation. Therefore, the notch 410 design helps reduce production difficulty and costs. Furthermore, when heat-melting the connecting ring 400, the notch 410 is preferentially heat-melted, facilitating rapid heat melting of the connecting ring 400.

[0058] The following is a brief description of the operation process when connecting the terminal post and the pressure block in the battery top cover structure provided in this embodiment:

[0059] S1. Workpiece positioning: Place the connecting ring 400 into the flared part 211, ensuring that the connecting ring 400 is in contact with the chamfered surface 212;

[0060] S2. High-frequency welding: The induction coil is wrapped around the outside of the connecting ring 400 and at the contact point between the connecting ring 400 and the chamfered surface 212. The high-frequency current generates an alternating magnetic field through the coil. Eddy currents are generated at the contact point between the connecting ring 400 and the chamfered surface 212 due to electromagnetic induction. Under the action of skin effect and proximity effect, the eddy currents are concentrated on the connecting ring 400, which in turn heats up the connecting ring 400. The connecting ring 400 is heated to a melting state in a short time to form a filling liquid. The filling liquid fills the space between the pole post 300 and the inner wall of the flared part 211. After the filling liquid cools and solidifies into a solid, the connection between the pole post 300 and the inner wall of the flared part 211 is formed.

[0061] Example 2

[0062] This embodiment provides a battery top cover structure. The following mainly describes the differences between this embodiment and Embodiment 1, while the similarities will not be repeated.

[0063] like Figure 8 As shown, the assembly hole 210 is a stepped hole 213, and the large-diameter end of the stepped hole 213 is a flared part 211. The connecting ring 400 is placed into the flared part 211, and the stepped plane 214 of the stepped hole 213 is supported on the bottom of the connecting ring 400.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery top cover structure, characterized in that, include: Top cover body (100), the top cover body (100) is used to cover the opening of the battery case; A pressure block (200) is insulatedly connected to the side of the top cover body (100) away from the battery case. The pressure block (200) is provided with an assembly hole (210). The end of the assembly hole (210) away from the top cover body (100) is provided with a flared portion (211). The diameter of the flared portion (211) is larger than the diameter of the assembly hole (210). A terminal post (300) is inserted through the top cover body (100) and the assembly hole (210), with one end of the terminal post (300) facing away from the battery case located inside the flared portion (211); A connecting ring (400) is located inside the flared portion (211). The connecting ring (400) can be heat-melted and solidified between the pole post (300) and the inner wall of the flared portion (211).

2. The battery top cover structure according to claim 1, characterized in that, The assembly hole (210) has a chamfer (212) on the edge away from the top cover body (100). The area enclosed by the chamfer (212) along the circumference of the assembly hole (210) is the flared part (211).

3. The battery top cover structure according to claim 2, characterized in that, The chamfer (212) has an angle of 45°.

4. The battery top cover structure according to claim 3, characterized in that, The length of the right-angled side of the chamfer (212) is a, the inner diameter of the connecting ring (400) is r1, the outer diameter of the connecting ring (400) is r2, and the height of the connecting ring (400) is b, wherein 0.8mm≤a≤1.2mm, 6mm≤r1≤6.5mm, 6.8mm≤r2≤7.2mm, and 0.8mm≤b≤1.2mm.

5. The battery top cover structure according to claim 1, characterized in that, The assembly hole (210) is a stepped hole (213), and the large-diameter end of the stepped hole (213) is the flared portion (211).

6. The battery top cover structure according to any one of claims 1-5, characterized in that, The connecting ring (400) is hot-melted by a high-frequency welding process.

7. The battery top cover structure according to claim 6, characterized in that, The connecting ring (400) is provided with a flux layer.

8. The battery top cover structure according to any one of claims 1-5, characterized in that, The connecting ring (400) is an aluminum ring.

9. The battery top cover structure according to any one of claims 1-5, characterized in that, The connecting ring (400) has a notch (410).

10. The battery top cover structure according to any one of claims 1-5, characterized in that, A gap (500) is left between the connecting ring (400) and the inner wall of the flared part (211).

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