Cylindrical battery

Abstract

The utility model provides a cylindrical battery. The cylindrical battery comprises a shell, a cap, a roll core and a liquid injection nozzle, the shell comprises a bottom plate and side plates connected to the periphery of the bottom plate, and the side plates and the bottom plate jointly define a containing space capable of containing the roll core. The cover cap is assembled at the end, away from the bottom plate, of the side plate and limits the roll core in the containing space. The shell has a first state before the shell is assembled with the cap and a second state after the shell is assembled with the cap; a through hole is formed in the bottom plate, the liquid injection nozzle penetrates through the through hole and extends into the containing space, and the liquid injection nozzle is used for injecting electrolyte into the containing space from bottom to top in the first state and can deform to block the through hole in the second state. After the liquid injection nozzle is inserted into the through hole in the bottom plate, electrolyte can be injected into the containing space from bottom to top through the liquid injection nozzle, the electrolyte can fully infiltrate the roll core, the liquid injection time is shortened, the production efficiency is improved, and the liquid injection nozzle does not need to be pulled out to serve as a part of the cylindrical battery to plug the through hole, so that the production efficiency is improved.

Description

Technical Field

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

[0002] For cylindrical batteries, after the core is inserted into the steel casing through the opening, the electrolyte injection nozzle penetrates deep into the casing through the opening to inject electrolyte. Afterwards, the casing is evacuated and sealed. However, due to the limited space inside the steel casing, the electrolyte flow rate slows down due to air resistance. Therefore, it needs to stand for a period to allow the electrolyte level to drop before continuing injection, repeating this process multiple times until the core is completely saturated with electrolyte before evacuation can proceed. This results in a long injection time, reducing the production efficiency of cylindrical batteries. Conversely, insufficient electrolyte standing time can lead to incomplete saturation of the core, affecting battery safety. Utility Model Content

[0003] The purpose of this application is to provide a cylindrical battery with better safety performance and improved production efficiency.

[0004] A cylindrical battery includes a casing, a cap, a winding core, and an injection nozzle. The casing includes a base plate and a side plate connected to the periphery of the base plate, the side plate and the base plate together forming a receiving space capable of accommodating the winding core. The cap is fitted to the end of the side plate away from the base plate and confines the winding core within the receiving space. The casing has a first state before being fitted with the cap and a second state after being fitted with the cap. The base plate has a through hole, the injection nozzle passes through the through hole and extends into the receiving space, the injection nozzle is used to inject electrolyte into the receiving space from bottom to top in the first state, and can deform to seal the through hole in the second state.

[0005] In one embodiment, the injection nozzle includes a protrusion and an insertion portion connected to the protrusion. The protrusion is exposed outside the base plate, and the insertion portion passes through the through hole and extends into the receiving space. The injection nozzle has an injection channel that penetrates the protrusion and the insertion portion, and the injection channel communicates with the receiving space. The protrusion can deform to block the injection channel.

[0006] In one embodiment, the core has a central hole, the through hole corresponds to the central hole, and the insertion portion extends into the central hole.

[0007] In one embodiment, the insertion portion extends into the central hole to a depth less than 1 / 4 of the total depth of the central hole.

[0008] In one embodiment, there is a gap between the insertion portion and the inner wall surface surrounding the central hole.

[0009] In one embodiment, the diameter of the through hole is smaller than the diameter of the central hole.

[0010] In one embodiment, the end of the insertion portion away from the protrusion is wedge-shaped and has two inclined surfaces. The injection channel includes a main channel and two sub-channels. One end of each of the two sub-channels is connected to the main channel, and the other end extends to the two inclined surfaces respectively.

[0011] In one embodiment, the cylindrical battery includes a negative electrode busbar disposed between the winding core and the base plate, and the negative electrode busbar has an opening through the hole corresponding to the position of the through hole, and the insertion part passes through the opening.

[0012] In one embodiment, the aperture of the opening is larger than the aperture of the through hole.

[0013] In one embodiment, the cylindrical battery includes a positive electrode busbar disposed between the cap and the winding core, the positive electrode busbar being electrically connected to both the winding core and the cap.

[0014] The beneficial effects of the cylindrical battery provided in this application embodiment are as follows: By opening a through hole in the bottom plate of the casing and inserting an injection nozzle into the through hole, electrolyte can be injected into the receiving space from bottom to top through the injection nozzle. Thus, as the liquid level gradually rises from bottom to top, the electrolyte can compress the air in the receiving space and smoothly expel it from the end of the side plate away from the bottom plate, fully wetting the core. This results in better wetting effect and safety performance of the cylindrical battery. Furthermore, it eliminates the need for the electrolyte to stand, shortening the injection time and improving the production efficiency of the cylindrical battery. In addition, after injection is completed, the injection nozzle does not need to be removed; instead, it can be used as part of the cylindrical battery to seal the through hole, further improving the production efficiency of the cylindrical battery. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0016] Figure 1 A cross-sectional view of the casing of a cylindrical battery provided in an embodiment of this application;

[0017] Figure 2A schematic diagram of the cylindrical battery provided in this application when the casing and cap are not assembled;

[0018] Figure 3 for Figure 2 Enlarged schematic diagram of a portion of the structure;

[0019] Figure 4 for Figure 2 A schematic diagram of the liquid injection nozzle in the cylindrical battery shown;

[0020] Figure 5 for Figure 2 The diagram shows the structure of a cylindrical battery after the casing and cap are assembled and the through hole is sealed by the injection nozzle.

[0021] Figure 6 for Figure 5 Enlarged schematic diagram of a portion of the structure;

[0022] The following are the labeling elements in the figure:

[0023] 10. Cylindrical battery; 100. Casing; 110. Base plate; 111. Through hole; 120. Side plate; 130. Accommodation space; 200. Cap; 300. Core; 310. Center hole; 400. Injection nozzle; 410. Protrusion; 420. Insertion part; 421. Angled surface; 430. Injection channel; 431. Main channel; 432. Sub-channel; 500. Negative electrode busbar; 510. Opening; 600. Positive electrode busbar; 700. Conductive handle; 20. Locking tile; 30. Sealing mold. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] Please refer to the following: Figures 1 to 5 The cylindrical battery 10 provided in this application embodiment will now be described. The cylindrical battery 10 includes a casing 100, a cap 200, a winding core 300, and a liquid filling nozzle 400. The casing 100 includes a base plate 110 and a side plate 120 connected to the periphery of the base plate 110. The side plate 120 and the base plate 110 together form a receiving space 130 capable of accommodating the winding core 300. The cap 200 is fitted to the end of the side plate 120 away from the base plate 110 and confines the winding core 300 within the receiving space 130. The casing 100 has a first state before being fitted with the cap 200 (e.g., ...). Figure 1 , Figure 2 (as shown) and the second state after assembly with cap 200 (as shown) Figure 5 (As shown). The base plate 110 has a through hole 111, and the injection nozzle 400 passes through the through hole 111 and extends into the receiving space 130. The injection nozzle 400 is used to inject electrolyte into the receiving space 130 from bottom to top in the first state, and can be deformed to block the through hole 111 in the second state.

[0029] The housing 100 is specifically a steel housing 100, which is not easily deformed or corroded, thus protecting the core 300 enclosed in the receiving space 130.

[0030] The first state is when the housing 100 is not assembled with the cap 200. In this state, the side plate 120 of the housing 100 is cylindrical and connected to the bottom plate 110 at one end. The core 300 can enter the receiving space 130 through the opening at the end of the side plate 120 away from the bottom plate 110. After the core 300 enters the receiving space 130 from the end of the side plate 120 away from the bottom plate 110, the core 300 needs to be welded around its perimeter to fix the core 300 to the side plate 120.

[0031] When the housing 100 is assembled with the cap 200, the end of the side plate 120 away from the bottom plate 110 is deformed and connected to the cap 200, and the connection between the two is completely sealed, thereby stably confining the core 300 within the receiving space 130. At this time, the housing 100 is in the second state.

[0032] Understandably, in the first state, the housing 100 can be inserted into the locking plate 20 and fixed, while the base plate 110 is in a low position, and the opening at the end of the side plate 120 away from the base plate 110 is in a high position, so that the core 300 can be inserted into the receiving space 130 from top to bottom. Then, the injection nozzle 400 is inserted from bottom to top through the through hole 111 on the base plate 110 and into the receiving space 130. In this way, electrolyte can be injected into the receiving space 130 from bottom to top through the injection nozzle 400. After the receiving space 130 is filled with electrolyte, a vacuum can be drawn from the receiving space 130 through the opening in the high position, and the cap 200 and the side plate 120 are assembled together using the sealing mold 30. During the vacuuming process, it is not easy to draw away the electrolyte, so as to avoid electrolyte loss. After the injection nozzle 400 is completed, it does not need to be pulled out. Simply rotate the housing 100 180° to deform the injection nozzle 400 and completely block the through hole 111 to obtain a completely sealed receiving space 130, thus preventing the electrolyte in the receiving space 130 from leaking.

[0033] In the aforementioned cylindrical battery 10, by opening a through hole 111 in the bottom plate 110 of the casing 100 and inserting an injection nozzle 400 into the through hole 111, electrolyte can be injected into the receiving space 130 from bottom to top through the injection nozzle 400. Thus, as the liquid level gradually rises from bottom to top, the electrolyte can compress the air in the receiving space 130 and smoothly discharge it from the end of the side plate 120 away from the bottom plate 110, fully wetting the core 300. This results in better wetting effect and safety performance of the cylindrical battery 10, and also eliminates the need for electrolyte settling, shortening the injection time and improving the production efficiency of the cylindrical battery 10. Furthermore, after injection is completed, the injection nozzle 400 does not need to be removed; instead, it can be used as part of the cylindrical battery 10 to seal the through hole 111, further improving the production efficiency of the cylindrical battery 10.

[0034] Combination Figures 2 to 4As shown in the specific embodiment of this application, the injection nozzle 400 includes a protrusion 410 and an insertion portion 420 connected to the protrusion 410. The protrusion 410 is exposed outside the base plate 110, and the insertion portion 420 passes through a through hole 111 and extends into the receiving space 130. The injection nozzle 400 has an injection channel 430 that penetrates the protrusion 410 and the insertion portion 420. The injection channel 430 communicates with the receiving space 130, and the protrusion 410 can deform to block the injection channel 430.

[0035] By providing an injection channel 430 inside the injection nozzle 400, the electrolyte can be introduced into the receiving space 130 along the injection channel 430. For the injection nozzle 400, the insertion part 420 may be press-fitted with the base plate 110 when it passes through the through hole 111, with no gap between them. The injection nozzle 400 can completely block the through hole 111 by deforming the protrusion 410 to seal the internal injection channel 430, thus preventing electrolyte leakage. Alternatively, the insertion part 420 may have a gap between it and the base plate 110 when it passes through the through hole 111. During injection, the protrusion 410 may be pressed tightly against the base plate 110 to completely cover the entire through hole 111. After injection, the protrusion 410 may be deformed to seal not only the gap between the insertion part 420 and the base plate 110 but also the internal injection channel 430. This can also completely block the through hole 111 by the injection nozzle 400, thus preventing electrolyte leakage. Furthermore, at least the protrusion 410 in the injection nozzle 400 is made of metal, and the protrusion 410 is deformed by welding to be stably connected to the base plate 110 and to block the injection channel 430.

[0036] Combination Figure 5 and Figure 6 As shown, specifically in this application, when the insertion part 420 passes through the through hole 111, there is a gap between it and the base plate 110. The protrusion 410 is deformed by welding and fused together with the insertion part 420 into the through hole 111, thus completely filling the space at the through hole 111 until it is flush with the surface of the base plate 110.

[0037] See again Figures 2 to 4 Specifically, in this application, the core 300 forms a central hole 310, and a through hole 111 corresponds to the central hole 310. The insertion part 420 extends into the central hole 310. In this application, the central hole 310 corresponds to the center position of the base plate 110, and therefore the through hole 111 is located at the center position of the base plate 110. By extending the insertion part 420 into the central hole 310, the electrolyte flowing out from the end of the insertion part 420 can be better diffused to the surrounding area, so as to achieve sufficient wetting of various positions on the core 300.

[0038] Furthermore, the depth to which the insertion part 420 extends into the central hole 310 is less than 1 / 4 of the total depth of the central hole 310. Let the depth of the insertion part 420 extending into the central hole 310 be h, and the total depth of the central hole 310 be H, then h < H / 4. Experiments show that if the depth of the insertion part 420 extending into the central hole 310 is greater than 1 / 4, after the electrolyte flows out from the end of the insertion part 420 into the receiving space 130, the electrolyte easily obstructs the smooth upward discharge of air, which is detrimental to the diffusion of the electrolyte. By ensuring that h < H / 4, rapid diffusion of the electrolyte can be ensured, accelerating the wetting of the core 300. Specifically, in this application, the depth h of the insertion part 420 extending into the central hole 310 is equal to 1 / 8 of the total depth H of the central hole 310.

[0039] Continue reading Figures 2 to 4 In this application, there is a gap between the insertion part 420 and the inner wall surface surrounding the central hole 310. It is understood that the insertion part 420 does not contact the inner wall surface surrounding the central hole 310 on the core 300. This not only prevents the insertion part 420 from contacting the inner wall surface of the core 300 and scratching it during insertion into the central hole 310, but also prevents the inner wall surface surrounding the central hole 310 from contacting the insertion part 420 and obstructing the smooth flow of electrolyte from the injection channel 430. This ensures that the electrolyte flowing from the end of the insertion part 420 can be smoothly sprayed onto the core 300 and rapidly diffused.

[0040] In this application, the insertion part 420 is cylindrical, and the central hole 310 is also cylindrical. The diameter of the insertion part 420 is smaller than the diameter of the central hole 310, and the insertion part 420 and the central hole 310 are coaxially arranged. This ensures that the insertion part 420 is completely separated from the winding core 300 and does not come into contact with it. Specifically, the insertion part 420 is made of insulating material to prevent contact with the winding core 300 from affecting the current collection to the busbar.

[0041] Specifically, in this application, the end of the insertion portion 420 away from the protrusion 410 is wedge-shaped with two inclined surfaces 421. The injection channel 430 includes a main channel 431 and two sub-channels 432. One end of each sub-channel 432 is connected to the main channel 431, and the other end extends to the two inclined surfaces 421 respectively. It can be understood that the end of the insertion portion 420 away from the protrusion 410 is the end of the insertion portion 420. By providing an inclined surface 421 at the end of the insertion portion 420, the electrolyte can first flow along the main channel 431, then change direction through the sub-channels 432, and finally flow out from the end of the sub-channels 432 located on the inclined surface 421. In this way, the inclined surface 421 allows the electrolyte to be sprayed obliquely upward onto the inner wall surface of the core 300, covering a large area, so that the electrolyte can be rapidly diffused.

[0042] In this application, there are two inclined surfaces 421 arranged in opposite directions. The electrolyte flowing out from the ends of the two sub-channels 432 can be sprayed in opposite directions onto the inner wall surface of the core 300. This increases the contact area between the electrolyte and the core 300, which helps the electrolyte to spread rapidly in the core 300, thereby improving the wetting effect.

[0043] In other embodiments, the inclined surface 421 and the sub-channels 432 can also be three, four, or other quantities, as long as the number of inclined surfaces 421 and sub-channels 432 corresponds one-to-one. Considering that the diameter of the main channel 431 is relatively small, setting a large number of sub-channels 432 would increase the production difficulty and cost of the injection nozzle 400. Therefore, two inclined surfaces 421 and two sub-channels 432 are chosen.

[0044] Continue reading Figures 2 to 4 In this application, the cylindrical battery 10 includes a negative electrode busbar 500 disposed between the core 300 and the base plate 110. An opening 510 is provided through the negative electrode busbar 500 at a position corresponding to the through hole 111, and the insertion portion 420 passes through the opening 510. The opening 510 on the negative electrode busbar 500 facilitates the insertion portion 420's end passing through the opening 510 to reach the side of the negative electrode busbar 500 facing the core 300, allowing the electrolyte flowing from the end of the insertion portion 420 to contact and wet the core 300. Specifically, the opening 510 is also positioned at the center of the base plate 110 and is coaxial with the through hole 111 and the center hole 310.

[0045] Specifically, both the through hole 111 and the opening 510 are circular. In other embodiments, the through hole 111 and the opening 510 can also be other shapes, such as triangles or rectangles.

[0046] Furthermore, the diameter of the opening 510 is larger than the diameter of the through hole 111. By making the diameter of the opening 510 larger than the diameter of the through hole 111, the insertion part 420 passing through the through hole 111 will not come into contact with the negative electrode busbar 500 when passing through the opening 510, thereby avoiding scratching the negative electrode return plate and affecting the current collection performance of the busbar. Specifically, the diameter of the opening 510 is 5mm, and the diameter of the through hole 111 is 2mm.

[0047] Furthermore, the diameter of the opening 510 is larger than the diameter of the center hole 310. Thus, the diameter of the opening 510 is larger than the diameter of the center hole 310, and the diameter of the center hole 310 is larger than the diameter of the through hole 111. Specifically, the diameter of the center hole 310 is 3 mm.

[0048] Specifically, in this application, the cylindrical battery 10 includes a positive electrode busbar 600 disposed between the cap 200 and the winding core 300. The positive electrode busbar 600 is electrically connected to both the cap 200 and the winding core 300. The positive electrode busbar 600 can collect and conduct the minute current on the winding core 300 to the cap 200. Furthermore, the cylindrical battery 10 includes a conductive handle 700, which is electrically connected between the positive electrode busbar 600 and the cap 200. The positive electrode busbar 600 conducts current to the cap 200 through the conductive handle 700.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cylindrical battery, characterized in that, The device includes a housing, a cap, a core, and an injection nozzle. The housing includes a base plate and side plates connected to the periphery of the base plate. The side plates and the base plate together form a receiving space capable of accommodating the core. The cap is fitted onto the end of the side plate away from the base plate and confines the core within the receiving space. The housing has a first state before being fitted with the cap and a second state after being fitted with the cap. The base plate has a through hole, and the injection nozzle passes through the through hole and extends into the receiving space. The injection nozzle is used to inject electrolyte into the receiving space from bottom to top in the first state and can deform to block the through hole in the second state.

2. The cylindrical battery according to claim 1, characterized in that, The injection nozzle includes a protrusion and an insertion part connected to the protrusion. The protrusion is exposed outside the bottom plate, and the insertion part passes through the through hole and extends into the receiving space. The injection nozzle has an injection channel that passes through the protrusion and the insertion portion, the injection channel is connected to the receiving space, and the protrusion can deform to block the injection channel.

3. The cylindrical battery according to claim 2, characterized in that, The core has a central hole, the through hole corresponds to the central hole, and the insertion part extends into the central hole.

4. The cylindrical battery according to claim 3, characterized in that, The insertion part extends into the central hole to a depth less than 1 / 4 of the total depth of the central hole.

5. The cylindrical battery according to claim 3, characterized in that, There is a gap between the insertion part and the inner wall surface surrounding the central hole.

6. The cylindrical battery according to claim 4, characterized in that, The diameter of the through hole is smaller than the diameter of the central hole.

7. The cylindrical battery according to claim 2, characterized in that, The end of the insertion part away from the protrusion is wedge-shaped and has two inclined surfaces. The injection channel includes a main channel and two sub-channels. One end of each of the two sub-channels is connected to the main channel, and the other end extends to the two inclined surfaces respectively.

8. The cylindrical battery according to claim 2, characterized in that, The cylindrical battery includes a negative electrode busbar disposed between the winding core and the base plate. An opening is formed through the negative electrode busbar at the position corresponding to the through hole, and the insertion part passes through the opening.

9. The cylindrical battery according to claim 8, characterized in that, The diameter of the opening is larger than the diameter of the through hole.

10. The cylindrical battery according to any one of claims 1 to 9, characterized in that, The cylindrical battery includes a positive electrode busbar disposed between the cap and the winding core, and the positive electrode busbar is electrically connected to both the winding core and the cap.

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