Battery cell top cover pole and battery

Abstract

The utility model provides a battery cell top cover pole and a battery, relates to the technical field of battery assembly, and is characterized in that a lower plastic cement is provided with a bearing part, a pole hole is fixedly provided with a fixing ring, a pole terminal fixedly connected with the bearing part is arranged in the fixing ring, a cavity is formed among the lower plastic cement, the pole terminal and the fixing ring, and the lower plastic cement is fixedly connected with the pole terminal. A convex ring is arranged in the cavity of the pole terminal, a coordination groove is formed in the corresponding position of the fixing ring, and a ring body is assembled in the cavity to achieve radial limitation on the pole terminal. And the ring body is also provided with a locking part for preventing the pole terminal from rotating. And the reinforcing ring is used for wrapping the fixing ring and the ring body and is also used for protecting the exposed part of the pole terminal. Connecting parts are reduced, each part structure is easy to process and simple to assemble, and the ring body also gives consideration to the limiting between the fixing ring and the pole terminal while ensuring the sealing performance, so that the whole structure is compact and stable, the sealing stability of the battery is further improved, and the cycle life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery assembly, in particular to a core top cover pole column and a battery. Background Art

[0002] Lithium-ion batteries have broad application prospects in wind and light energy storage, small household energy storage, and automotive power batteries due to their advantages such as high energy density, high power density, long cycle life, good safety, and environmental friendliness. Among them, square aluminum shell batteries are widely used in energy storage batteries and power batteries because of their high volume utilization rate at the system integration end. To further improve the battery energy density and reduce the battery cost, the designed battery capacity is increasing continuously at present. Correspondingly, battery safety is becoming more and more important, and the battery safety standards of various countries are gradually adjusted and increased every year. The stability of battery structural components is the premise to ensure the safety and reliability of the battery during long-term operation.

[0003] For the elastic sealing and fixing of the pole column of the existing battery structural component cover plate assembly, it is mainly sealed by a fluororubber elastic sealing ring arranged between the top cover / top cover connecting piece and the pole column terminal, and a fixing piece is arranged around the sealing ring to form a fixing with the pole column. Such a structure is complex, and as the battery usage time increases, the fluororubber sealing ring is soaked in the electrolyte for a long time, and electrolyte leakage occurs due to the displacement of the pole column caused by external force during use. In addition, the elastic fixing limit is unstable and the service life is short, resulting in electrolyte leakage from the side wall of the electrode column and loss of fixation, affecting the electrical performance and safety of the battery. Summary of the Utility Model

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to provide a core top cover pole column and a battery, adopting the following technical solutions:

[0005] On the one hand, the utility model provides a core top cover pole column, including a top cover plate and a lower plastic. The lower plastic is fixedly arranged on the bottom surface of the top cover plate. At least one pole column hole is correspondingly arranged on the top cover plate and the lower plastic, wherein:

[0006] A fixing ring is fixedly arranged in the pole column hole, and a pole column terminal is arranged in the fixing ring. The pole column terminal is clamped to the lower plastic; a cavity is formed among the lower plastic, the fixing ring and the pole column terminal, and a ring body is arranged in the cavity;

[0007] It further includes a reinforcing ring. One end of the reinforcing ring is fixedly arranged on the top of the top cover plate, and the other end is clamped to the side wall of the pole column terminal, and the reinforcing ring covers the above-mentioned fixing ring and the ring body.

[0008] In the above technical solution, the fixing ring provides support for the pole column terminal, which helps to maintain the structural stability of the pole column terminal. The ring body provides efficient sealing, and the overall structure is compact and stable, thereby improving the battery sealing stability and the battery cycle life. Compared with the traditional pole column structure, this solution reduces the number of components, is simple to assemble, and reduces the assembly difficulty and manufacturing cost.

[0009] The ring body is made of non-fluorine rubber with excellent thermal stability and electrochemical stability with the electrolyte and metal electrodes. Compared with the traditional conventional fluorine rubber sealing ring, it has significant material strength, enabling the sealing structure to maintain high stability in different temperature ranges.

[0010] The purpose of setting the reinforcing ring is to wrap the ring body and the fixing ring, protect the part of the pole column assembly structure above the top cover plate, enhance the mechanical strength of the entire assembly structure, and improve its ability to resist external impact and vibration.

[0011] For further improvement, a stop portion is provided on the outer side wall of the above fixing ring, and the stop portion abuts against the upper edge of the pole column hole.

[0012] In the above technical solution, in the assembly process of the fixing ring, the fixing ring needs to be fixed in the pole column hole by means of welding or the like. The above stop portion can accurately determine the position of the fixing ring and provide necessary support for the subsequent fixing process.

[0013] For further improvement, the above ring body is in interference fit with the above fixing ring and the pole column terminal.

[0014] In the above technical solution, by assembling the ring body in the cavity, it is ensured that the pole column terminal remains stable during installation and use. The interference fit also improves the stability and reliability of the pole column terminal sealing structure, and can maintain good sealing performance during subsequent pole column welding and power connection heating.

[0015] For further improvement, a supporting portion is provided in the above pole column hole of the above lower plastic. The supporting portion abuts against the lower end of the fixing ring and is fixedly connected to the pole column terminal. A clamping groove is provided on the side wall of the above pole column terminal, and the end of the above supporting portion is clamped in the above clamping groove.

[0016] In the above technical solution, the clamping structure of the clamping groove and the supporting portion facilitates the rapid positioning and pre-fixing of the pole column terminal, simplifies the production process, reduces the assembly time, and improves the production efficiency.

[0017] For further improvement, a convex ring is provided on the side wall of the above pole column terminal in the cavity, and a coordination groove is provided on the inner side of the fixing ring in the cavity, and the coordination groove and the convex ring are arranged opposite to each other.

[0018] In the above technical solution, the middle part of the ring body is bent and wraps the convex ring of the pole terminal, forming a stable connection structure, which can withstand the vibration or impact along the radial direction of the pole terminal during the use of the battery, ensuring firm positioning.

[0019] For further improvement, at least one locking hole is provided on the side wall of the above-mentioned pole terminal within the cavity, a locking portion 31 is provided on the side wall of the above-mentioned ring body 3 corresponding to the above-mentioned locking hole, and the above-mentioned locking portion 31 is inserted into the above-mentioned locking hole 22.

[0020] In the above technical solution, the ring body is provided with a locking portion to prevent the pole terminal from rotating, avoiding the rotation of the pole terminal due to vibration, impact or other external forces, and improving the overall stability and durability of the battery.

[0021] For further improvement, the above-mentioned pole terminal is made of a single metal or is formed by laminating multiple metals.

[0022] For further improvement, the above-mentioned pole terminal is laminated with a first metal layer and a second metal layer from top to bottom, an upper half convex ring is provided at the lower end of the above-mentioned first metal layer, a lower half convex ring is provided on the above-mentioned second metal layer, and the above-mentioned upper half convex ring and the lower half convex ring are stacked to form the above-mentioned convex ring.

[0023] In the above embodiment, the purpose of setting the double-layer metal layer is to improve the electrochemical stability between the pole and the electrolyte, and at the same time reduce the cost of the pole. Specifically, thermoplastic materials with excellent thermal stability and electrochemical stability with the electrolyte and metal electrodes are used. Compared with traditional conventional fluororubber sealing rings, they have significant material strength, enabling the sealing structure to maintain high stability in different temperature ranges.

[0024] The present utility model further provides a battery, and the top cover assembly of the battery includes the cell top cover pole structure as described in any one of the above structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 It is an assembly schematic diagram of the overall structure of the present utility model;

[0027] Figure 2 It is an assembly schematic diagram of the present utility model assembled in a battery;

[0028] Figure 3 This is a cross-sectional view of the overall structure and the pole terminal of the present utility model;

[0029] Figure 4 This is a partial cross-sectional view of the fixing ring in the present utility model;

[0030] Figure 5 This is an assembly schematic diagram of the ring body and the pole terminal of the present utility model;

[0031] Figure 6 This is a cross-sectional view of the first embodiment of the present utility model;

[0032] Figure 7 This is a cross-sectional view of the second embodiment of the present utility model.

[0033] Reference numerals:

[0034] 100 - top cover plate; 200 - lower plastic; 201 - supporting part; 300 - pole hole; 400 - battery housing; 500 - winding core; 501 - tab; 600 - connecting piece;

[0035] 1 - fixing ring; 2 - pole terminal; 3 - ring body; 4 - reinforcing ring;

[0036] 11 - stop part; 12 - coordination groove;

[0037] 2a - first metal layer; 2b - second metal layer; 21 - clamping groove; 22 - locking hole; 23 - convex ring; 24 - groove;

[0038] 231 - upper half convex ring; 232 - lower half convex ring;

[0039] 31 - locking part;

[0040] 41 - convex part. Detailed implementation manners

[0041] For the convenience of those skilled in the art to understand, the embodiments will now be combined with the accompanying drawings to further describe the structure of the present utility model in detail:

[0042] In the description of the present utility model, the orientation or positional relationship indicated by terms such as "part", "side", "end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model.

[0043] First embodiment:

[0044] As Figure 1As shown in the figure, the present application provides a pole post for a battery cell top cover, which includes a top cover plate 100 and a lower plastic 200. The lower plastic 200 is fixedly arranged on the bottom surface of the top cover plate 100, and at least one pole post hole 300 is correspondingly arranged on the top cover plate 100 and the lower plastic 200.

[0045] It should be noted that the top cover plate 100 is usually provided with two pole post holes 300, which form a positive pole post and a negative pole post after assembly. In the present application, there is no essential difference in the structures of the two pole post holes 300, so the following description will still collectively refer to them as the pole post holes 300. For easy understanding, a battery structure equipped with the present utility model is introduced as a supplementary description. As Figure 2 shown, the battery includes a battery case 400. The lower plastic 200 and the top cover plate 100 are fixedly covered on the top of the battery case 400. A positive pole post terminal and a negative pole post terminal are arranged on the top cover plate 100, and the lower plastic 200 is fixedly arranged on the lower side of the top cover plate 100. A battery core 500 of the battery is arranged in the battery case 400. An electrode tab 501 is arranged at the upper end of the battery core 500. Two connecting pieces 600 are arranged between the top cover assembly and the battery core 500, serving as a positive connecting piece 600 and a negative connecting piece 600. The two connecting pieces 600 connect the positive and negative pole post terminals and the electrode tab 501.

[0046] As Figure 3 shown, in the present application, a fixing ring 1 is fixedly arranged in the pole post hole 300, and a pole post terminal 2 is arranged in the fixing ring 1; a supporting portion 201 is formed by the lower plastic 200 extending into the pole post hole 300. The supporting portion 201 abuts against the lower end of the fixing ring 1 and is fixedly connected to the pole post terminal 2; a cavity is formed between the lower plastic 200, the fixing ring 1 and the pole post terminal 2, and a ring body 3 is assembled in the cavity. The ring body 3 is in interference fit with the above-mentioned fixing ring 1 and the pole post terminal 2.

[0047] In the above structure, the fixing ring 1 provides support for the pole post terminal 2, which helps to maintain the structural stability of the pole post terminal 2. An effective sealing structure with interference fit is formed by assembling the ring body 3 with the pole post terminal and the fixing ring to prevent the leakage of electrolyte and the intrusion of external pollutants. From Figure 1 and Figure 2 it can be clearly seen that compared with the traditional pole post structure, the present solution reduces the number of components, is simple to assemble, and reduces the assembly difficulty and manufacturing cost.

[0048] Further combined with Figure 4Structural view of the fixing ring 1 of an embodiment shown. A stop portion 11 is provided on the outer sidewall of the fixing ring 1, and the stop portion 11 abuts against the upper edge of the pole column hole 300. Specifically, in the assembly process of the fixing ring 1, the fixing ring 1 is embedded downward from above the pole column hole 300 into the inside of the pole column hole 300. The lower end of the fixing ring 1 abuts against the above-mentioned supporting portion 201, and the stop portion 11 abuts against the upper edge of the pole column hole 300 to fix the position of the fixing ring 1. After determining this position, the fixing ring 1 is fixedly connected to the top cover plate 100. Preferably, laser welding is performed around the positions where the fixing ring 1 contacts the upper and lower edges of the pole column hole 300 to form a firm connection, providing a firm foundation for the connection of other subsequent components.

[0049] Reference Figure 3 and Figure 6 , a convex ring 23 is provided on the sidewall of the pole terminal 2 inside the cavity, and a coordination groove 12 is provided inside the fixing ring 1 inside the cavity, and the coordination groove 12 and the convex ring 23 are arranged opposite to each other.

[0050] In this embodiment, the convex ring 23 is provided in the middle of the pole terminal 2. The longitudinal section of the convex ring 23 is a protruding arc, while the longitudinal section of the coordination groove 12 is a concave arc, and the cross-sectional aperture of the coordination groove 12 is larger than the inner diameter of the cross-section of the convex ring 23. This structure forms a C-shaped bending portion in the middle of the cavity. The shape of the middle part of the ring body 3 matches the shape of this bending portion. After the ring body 3 is assembled, it can wrap the convex ring 23 of the pole terminal 2 to form a stable connection structure, which can withstand the vibration or impact along the radial direction of the pole terminal 2 during the use of the battery, ensuring stable positioning.

[0051] Furthermore, the above-mentioned ring body 3 is made of non-fluororubber material. Due to the excellent processing performance of non-fluororubber, it is suitable for various mold forming processes. In this embodiment, injection molding process is preferably used to manufacture the ring body 3. Further, non-fluororubber has good structural strength and fatigue resistance, and is not easily damaged by fatigue due to pole bumping, thus achieving effective sealing for a long time.

[0052] As Figure 5 and Figure 6 shown, a clamping groove 21 is provided on the sidewall of the pole terminal 2, and the end of the supporting portion 201 is clamped in the clamping groove 21. The clamping structure of the clamping groove 21 and the supporting portion 201 facilitates the quick positioning and pre-fixing of the pole terminal 2, simplifies the assembly process, improves production efficiency, gets rid of the dependence on fasteners or adhesives, and is convenient for subsequent maintenance and part replacement. At the same time, a cavity with the bottom surface being the supporting portion 201, the inner side being the sidewall of the pole terminal 2, and the outer side being the sidewall of the fixing ring 1 is formed, further ensuring the close fit and structural stability of each component.

[0053] As Figure 5Schematic diagram of the structure of the terminal post 2 and the ring body 3 shown. At least one locking hole 22 is provided on the side wall of the terminal post 2 within the cavity, and a locking portion 31 is provided at the corresponding position on the side wall of the ring body 3.

[0054] In this embodiment, four locking holes 22 are arranged in a circumferential manner at the same horizontal height along the side wall of the terminal post 2, and the cross-sectional shape thereof is preferably semi-circular. The locking portion 31 can provide an additional fixing point for the terminal post 2 to ensure that it does not rotate or displace during battery use.

[0055] It should be emphasized that the cross-sectional shape of the locking hole 22 can also be set to a square, a triangle, or other shapes that can achieve relative fixation between the ring body 3 and the terminal post 2, and the number is not limited to four. Those skilled in the art can adjust according to the size of the terminal post 2 or other actual requirements.

[0056] Furthermore, the setting position of the locking hole 22 is above the convex ring 23. The purpose of such a setting is to more conveniently observe whether the locking portion is accurately inserted into and locked with the locking hole, make timely adjustments, ensure that the ring body is installed in place, achieve the expected limiting effect, and prevent the terminal post from rotating.

[0057] As Figure 3 and Figure 6 shown, this embodiment further includes a reinforcing ring 4. One end of the reinforcing ring 4 is fixedly provided at the top of the top cover plate 100, and the other end is clamped to the side wall of the terminal post 2, and the reinforcing ring 4 covers the fixing ring 1 and the ring body 3.

[0058] Specifically, a groove 24 is provided at a position on the upper side of the side wall of the terminal post 2, a convex portion 41 is provided on the upper side of the inner wall of the reinforcing ring 4, the reinforcing ring 4 is fixedly connected to the upper side of the terminal post hole 300 of the top cover plate 100 by welding or gluing, and the above-mentioned convex portion 41 is clamped to the above-mentioned groove 24. The purpose of setting the reinforcing ring 4 is to protect the part of the terminal post assembly structure higher than the top cover plate 100, enhance the mechanical strength of the entire assembly structure, and improve its ability to resist external impacts and vibrations.

[0059] Second Embodiment:

[0060] As Figure 7 shown, the difference from the first embodiment is that the terminal post 2 of this embodiment is stacked with a first metal layer 2a and a second metal layer 2b from top to bottom. An upper semi-convex ring 231 is provided at the lower end of the first metal layer 2a, and a lower semi-convex ring 232 is provided on the second metal layer 2b. The upper semi-convex ring 231 and the lower semi-convex ring 232 are stacked to form a convex ring 23. The first metal layer 2a and the second metal layer 2b are fixedly connected by welding or stamping and compounding, etc. The convex ring 23 formed by stacking the upper semi-convex ring 231 and the lower semi-convex ring 232 wraps the ring body 3 to further stabilize the overall structure.

[0061] Among them, the purpose of setting the double-layer metal layer is to improve the electrochemical stability between the terminal post and the electrolyte, and at the same time reduce the cost of the terminal post.

[0062] Specifically, in this embodiment, the first metal layer 2a of the negative terminal post 2 is an aluminum layer, and the second metal layer 2b is a copper layer. The copper layer has good electrical conductivity and low resistivity, and can conduct current more effectively. The outer aluminum layer is light in weight and has good corrosion resistance and welding performance.

[0063] In this embodiment, since a part of the first metal layer 2a is exposed outside the battery and used to connect an external wire or conductor, it is likely to be offset due to external influence during use. The above reinforcing ring 4 is clamped to the first metal layer 2a, and the above locking hole 22 is provided on the first metal layer 2a to ensure the stability of the electrical connection; correspondingly, the second metal layer 2b is arranged inside the battery and in a stable environment. The above clamping groove 21 is provided on the second metal layer 2b to achieve a firm internal fixation.

[0064] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A battery cell top cover pole, comprising a top cover plate (100) and a lower plastic (200), wherein the lower plastic (200) is fixedly arranged on the bottom surface of the top cover plate (100), and the top cover plate (100) and the lower plastic (200) are correspondingly provided with at least one pole hole (300), characterized in that: A fixing ring (1) is fixedly arranged in the pole hole (300), a pole terminal (2) is arranged in the fixing ring (1), and the pole terminal (2) is clamped to the lower plastic (200); a cavity is formed between the lower plastic (200), the fixing ring (1) and the pole terminal (2), and a ring body (3) is arranged in the cavity; It also includes a reinforcing ring (4), one end of which is fixedly arranged on the top of the top cover plate (100), and the other end of which is clamped on the side wall of the pole terminal (2), and the reinforcing ring (4) covers the fixing ring (1) and the ring body (3).

2. A battery cell top cover pole according to claim 1, characterized in that: The outer wall of the fixing ring (1) is provided with a stop portion (11), and the stop portion (11) abuts against the upper edge of the pole hole (300).

3. A battery cell top cover pole according to claim 1, characterized in that: The ring body (3) is interference-fitted with the fixing ring (1) and the pole terminal (2).

4. A battery cell top cover pole according to claim 1, characterized in that: The lower plastic (200) is provided with a supporting portion (201) in the pole hole (300), the supporting portion (201) abuts against the lower end of the fixing ring (1) and is fixedly connected to the pole terminal (2), the side wall of the pole terminal (2) is provided with a clamping groove (21), and the end of the supporting portion (201) is clamped in the clamping groove (21).

5. The battery cell top cover pole according to claim 1, characterized in that: A convex ring (23) is arranged in a cavity on the side wall of the pole terminal (2), and a coordination groove (12) is arranged in the cavity on the inner side of the fixing ring (1), and the coordination groove (12) and the convex ring (23) are arranged opposite to each other.

6. A battery cell top cover pole according to claim 1, characterized in that: The side wall of the pole terminal (2) is provided with at least one locking hole (22) in the cavity, and the side wall of the ring body (3) is provided with a locking portion (31) corresponding to the locking hole (22), and the locking portion (31) is inserted into the locking hole (22).

7. A battery cell top cover pole according to any one of claims 1 to 6, characterized in that: The pole terminal (2) is made of a single metal, or is formed by stacking multiple metals.

8. A battery cell top cover pole according to claim 7, characterized in that: The pole terminal (2) is stacked and fixedly provided with a first metal layer (2a) and a second metal layer (2b) from top to bottom, the lower end of the first metal layer (2a) is provided with an upper half convex ring (231), the second metal layer is provided with a lower half convex ring (232), and the upper half convex ring (231) and the lower half convex ring (232) are stacked to form the convex ring (23).

9. A battery, characterized in that: The battery comprises a cell top cover pole having a structure as described in any one of claims 1 to 6.

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