Cylindrical battery case and cylindrical battery

Abstract

The utility model belongs to battery technical field discloses a kind of cylindrical battery shell and cylindrical battery.Cylindrical battery shell includes shell cylinder body and tube core.The axial one end of shell cylinder body is equipped with injection hole;Tube core is located in shell cylinder body, and the axial both ends of tube core are respectively abutted on the inner wall of the axial both ends of shell cylinder body, and the inside wall of shell cylinder body and the outside wall of tube core are surrounded to form accommodating cavity, and the axial one end of tube core is communicated with injection hole, and the axial other end of tube core is communicated with accommodating cavity;The winding core formed by pole piece winding is located in accommodating cavity, and tube core is located in the central hole of winding core.The cylindrical battery shell can avoid that electrolyte directly impacts winding core when injecting liquid, and can also support winding core, to avoid winding core deformation.

Description

Technical Field

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

[0002] Cylindrical batteries are a common type of lithium-ion battery, widely used in electric vehicles, portable electronic devices, and energy storage systems. In actual production, the electrode sheets are wound into shape on the outside to form a core, which is then placed inside the battery casing, and electrolyte is injected through the electrolyte inlet of the casing. However, during electrolyte injection, the core lacks protection in the middle, and is susceptible to deformation and collapse due to the impact of the electrolyte, posing a safety hazard to cylindrical batteries.

[0003] Therefore, there is an urgent need to propose a cylindrical battery casing and a cylindrical battery to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a cylindrical battery casing and a cylindrical battery.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Cylindrical battery casing, including:

[0007] A shell-shaped body, wherein a liquid injection hole is provided at one axial end of the shell-shaped body;

[0008] The core is located inside the shell, and its two axial ends abut against the inner walls of the shell at both axial ends. The inner wall of the shell and the outer wall of the core form a receiving cavity. One axial end of the core is connected to the injection hole, and the other axial end of the core is connected to the receiving cavity. A core formed by winding an electrode sheet is located inside the receiving cavity, and the core is located in the central hole of the core.

[0009] As an optional technical solution for a cylindrical battery casing, the cylindrical battery casing further includes a first electrode assembly. The first electrode assembly includes a first electrode, which passes through the end of the casing body away from the liquid injection hole and abuts against the core. A flow guide groove is provided on the side surface of the first electrode facing the core. The flow guide groove connects the core and the receiving cavity. The first electrode is connected to the winding core.

[0010] As an optional technical solution for cylindrical battery casing, the flow guide groove includes a storage tank and an extension groove. The storage tank is positioned opposite to the core, and one end of the extension groove is connected to the storage tank, while the other end extends radially away from the storage tank.

[0011] As an optional technical solution for cylindrical battery casing, the extension groove extends radially through one end of the storage tank away from the storage tank; and / or,

[0012] The depth of the storage tank and the extension tank ranges from 0.4mm to 0.6mm, and the width of the extension tank ranges from 2.6mm to 3.0mm.

[0013] As an optional technical solution for cylindrical battery casing, the number of the extension grooves is multiple, and the multiple extension grooves are evenly distributed at intervals along the circumference of the storage tank; and / or,

[0014] The extension groove has protrusions on both sides of its width, and the core is connected to the protrusions.

[0015] As an optional technical solution for cylindrical battery casing, the core includes a tube body and a surrounding edge. The surrounding edge is located at the end of the tube body away from the liquid injection hole and abuts against the first electrode post. The surrounding edge extends along the outer circumference of the tube body and is arranged in a closed loop.

[0016] As an alternative technical solution for cylindrical battery casing, the radial dimension of the storage tank is larger than the radial dimension of the tube body and smaller than the radial dimension of the surrounding edge.

[0017] As an optional technical solution for cylindrical battery casing, the casing body and the core are coaxially arranged.

[0018] The second objective of this invention is to provide a cylindrical battery with high safety performance.

[0019] To achieve this objective, the present invention adopts the following technical solution:

[0020] A cylindrical battery includes a core and a cylindrical battery casing. The core is formed by winding electrode sheets and is located inside the casing. The core is located in the central hole of the core.

[0021] As an optional technical solution for cylindrical batteries, the cylindrical battery further includes a first current collector, which is located inside the casing and connected to the winding core. The cylindrical battery is electrically connected to the outside through the first current collector.

[0022] The beneficial effects of this utility model are:

[0023] The cylindrical battery casing provided by this utility model includes a casing body and a core. The casing body has an injection hole for injecting electrolyte into the casing body. The two ends of the core abut against the inner wall of the casing body. The inner side wall of the casing body and the outer side wall of the core form a receiving cavity. The two ends of the core are connected to the injection hole and the receiving cavity, respectively. The electrolyte entering from the injection hole can flow through the core to the receiving cavity, thereby filling the receiving cavity and entering the core, avoiding direct impact of the electrolyte on the core and causing core deformation. At the same time, since the core is located in the central hole of the core, it also plays a supporting role in the core, further preventing core deformation. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the cylindrical battery provided in an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A magnified view of a portion at point A;

[0026] Figure 3 This is a schematic diagram of the structure of the first pole column provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the core structure provided in an embodiment of the present invention.

[0028] In the picture:

[0029] 10. Winding core; 20. First current collector;

[0030] 100. Shell body; 200. Core tube; 210. Tube body; 220. Surrounding edge; 310. First pole post; 311. Storage tank; 312. Extension groove; 313. Protrusion; 320. Rubber coating; 330. Lower plastic; 340. Sealing ring. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] This embodiment provides a cylindrical battery casing that can prevent the electrolyte from directly impacting the winding core during electrolyte injection and can also support the winding core to prevent deformation.

[0036] Specifically, such as Figures 1 to 3 As shown, the cylindrical battery casing includes a casing body 100 and a core 200. One axial end of the casing body 100 has an injection hole; the core 200 is located inside the casing body 100, and both axial ends of the core 200 abut against the inner walls of both axial ends of the casing body 100. The inner wall of the casing body 100 and the outer wall of the core 200 form a receiving cavity. One axial end of the core 200 communicates with the injection hole, and the other axial end of the core 200 communicates with the receiving cavity; a core 10 formed by winding electrode sheets is located within the receiving cavity, and the core 200 is located in the central hole of the core 10.

[0037] During actual electrolyte injection, the injection hole of the cylindrical battery case is placed facing upwards. The electrolyte is injected into the core 200 through the injection hole and flows into the bottom of the receiving cavity through the core 200. As the electrolyte is continuously injected, the receiving cavity is gradually filled with electrolyte, and at the same time, the electrolyte gradually enters the interior of the core 10.

[0038] Based on the above design, the casing 100 is provided with an injection hole for injecting electrolyte into the casing 100. The two ends of the die 200 abut against the inner wall of the casing 100, and the inner wall of the casing 100 and the outer wall of the die 200 form a receiving cavity. The two ends of the die 200 are connected to the injection hole and the receiving cavity, respectively. Electrolyte entering through the injection hole can flow through the die 200 to the receiving cavity, thereby filling the cavity and entering the core 10, preventing direct impact of the electrolyte on the core 10 and causing deformation. Simultaneously, since the die 200 is located in the central hole of the core 10, it also supports the core 10, further preventing deformation and improving the safety performance of the cylindrical battery.

[0039] It should be noted that during the high-current fast charging of cylindrical batteries, the electrode at the center hole of the core 10 generates a lot of heat, which can easily affect the conventional plastic core 200 and pose a safety hazard. Therefore, the core 200 is made of aluminum, which has good heat dissipation performance.

[0040] Optionally, a notch is provided on the side wall of the end of the core 200 opposite to the injection hole, through which the electrolyte in the core 200 can enter the receiving cavity.

[0041] Optionally, the cylindrical battery casing also includes a first electrode post 310 assembly. The first electrode post 310 assembly includes a first electrode post 310, which passes through the end of the casing 100 away from the liquid injection hole and abuts against the core 200. The surface of the first electrode post 310 facing the core 200 is provided with a flow guide groove, which connects the core 200 and the receiving cavity. The first electrode post 310 is connected to the winding core 10. Since the core 200 is located in the center hole of the core 10, when the core 200 abuts against the first electrode post 310, the first electrode post 310 and the core 10 are roughly opposite each other, which facilitates the connection between the first electrode post 310 and the core 10. A flow guide groove is provided on the first electrode post 310, that is, the end of the core 200 and the first electrode post 310 are kept apart to avoid gaps. The electrolyte can flow into the receiving cavity through this gap, avoiding the need for notches on the core 200, which would affect the structural strength of the core 200. Secondly, by abutting the core 200 against the first electrode post 310 and providing a flow guide groove on the first electrode post 310, the internal wall of the shell 100 is avoided, which would affect the structural strength of the shell 100.

[0042] Furthermore, the guide channel includes a storage tank 311 and an extension channel 312. The storage tank 311 is positioned opposite to the core 200. One end of the extension channel 312 is connected to the storage tank 311, and the other end extends radially away from the storage tank 311. Electrolyte can flow from the core 200 into the storage tank 311, and then flow from the storage tank 311 through the extension channel 312 into the receiving cavity. The extension channel 312 can guide the electrolyte away from the core 200, preventing the electrolyte from accumulating around the core 200 and preventing excessive accumulation of electrolyte from impacting the winding core 10.

[0043] In this embodiment, the shell 100, the core 200, the first pole post 310, and the storage tank 311 are all coaxially arranged.

[0044] Furthermore, the extension groove 312 extends radially away from one end of the storage tank 311, meaning the extension groove 312 can guide the electrolyte to the edge of the first electrode post 310. The electrolyte can enter the receiving cavity from the side wall edge of the first electrode post 310, flowing approximately from the outside to the inside of the core 10. To ensure uniform circumferential impact on the core 10, multiple extension grooves 312 are provided, evenly distributed circumferentially along the storage tank 311.

[0045] For example, the number of extension slots 312 can be two, three, or four, etc.

[0046] In this embodiment, there are two extension slots 312.

[0047] Specifically, the depth of the storage tank 311 and the extension tank 312 ranges from 0.4mm to 0.6mm, and can be, for example, 0.4mm, 0.5mm, or 0.6mm. If the depth of the guide tank is too large, the electrolyte injection speed will be too fast, which may easily impact the core 10 and affect the structural strength of the first electrode post 310; if the depth of the guide tank is too small, the injection speed will be too slow, affecting the injection efficiency.

[0048] The width of the extension groove 312 ranges from 2.6mm to 3.0mm, and can be, for example, 2.6mm, 2.8mm, or 3.0mm. Similarly, if the width of the extension groove 312 is too large, the electrolyte injection speed will be too fast, which may easily impact the core 10 and affect the structural strength of the first electrode post 310; if the width of the extension groove 312 is too small, the injection speed will be too slow, affecting the injection efficiency.

[0049] As shown in Figure 3, the width of the extension groove 312 has protrusions 313 on both sides, and the core 10 is connected to the protrusions 313 to avoid affecting the flow of electrolyte in the extension groove 312.

[0050] like Figure 4As shown, the core 200 includes a tube body 210 and a surrounding edge 220. The surrounding edge 220 is located at the end of the tube body 210 away from the injection hole and abuts against the first electrode post 310. The surrounding edge 220 extends along the outer periphery of the tube body 210 and is arranged in a closed loop, increasing the contact area between the core 200 and the first electrode post 310, thereby improving the connection strength between the core 200 and the first electrode post 310.

[0051] Furthermore, the radial dimension of the storage tank 311 is larger than the radial dimension of the tube body 210 and smaller than the radial dimension of the surrounding edge 220. Based on the fact that the surrounding edge 220 can abut against the outer peripheral edge of the storage tank 311, increasing the radial dimension of the storage tank 311 increases the capacity of the electrolyte in the storage tank 311.

[0052] Continue as Figure 1 and Figure 2 As shown, the first electrode post 310 assembly also includes an overlay 320, a lower plastic 330, and a sealing ring 340. The overlay 320 is located on the side of the shell 100 away from the core 200 and wraps around the first electrode post 310. The lower plastic 330 is located inside the shell 100 and is fitted onto the first electrode post 310 to insulate and isolate the shell 100 and the core 10. The sealing ring 340 is used to insulate and seal the first electrode post 310. The specific assembly method of the first electrode post 310 assembly is a relatively mature existing technology in this field and will not be described in detail here.

[0053] In this embodiment, the first terminal 310 is the positive terminal, serving as the positive electrode of the cylindrical battery.

[0054] The cylindrical battery casing also includes a second electrode assembly, which includes a second electrode that serves as the negative electrode of the cylindrical battery. The specific structure of the second electrode assembly can be set as needed.

[0055] This embodiment also provides a cylindrical battery with high safety performance.

[0056] Specifically, the cylindrical battery includes a core 10 and a cylindrical battery casing. The core 10 is formed by winding electrode sheets and is located inside the casing 100. A die 200 is located in the central hole of the core 10. Electrolyte entering through the injection hole can flow through the die 200 to the receiving cavity, thereby filling the receiving cavity and entering the interior of the core 10, preventing the electrolyte from directly impacting the core 10 and causing deformation. At the same time, since the die 200 is located in the central hole of the core 10, it also serves to support the core 10, further preventing deformation of the core 10 and improving the safety performance of the cylindrical battery.

[0057] Furthermore, the cylindrical battery also includes a first current collector 20, which is located inside the casing 100 and connected to the winding core 10. The cylindrical battery is electrically connected to the outside through the first current collector 20.

[0058] In this embodiment, the first current collector 20 is sleeved on the core 200, and its two sides abut against the first pole post 310 and the core 10, respectively. Specifically, the first current collector 20 is connected to the first pole post 310 and the core 10 by welding. The welding process is existing technology in the field and will not be described in detail here.

[0059] Furthermore, the first current collector 20 is provided with an annular protrusion, and an annular groove is formed on the inner side of the annular protrusion. The annular protrusion abuts against the first pole post 310, and the surrounding edge 220 is placed on the bottom of the annular groove and abuts against the first pole post 310.

[0060] It is worth noting that the height of the annular protrusion is equal to the thickness of the 220mm rim.

[0061] In this embodiment, the first current collector 20 is a positive current collector disk, and the cylindrical battery also includes a second current collector, which is a negative current collector disk.

[0062] This embodiment also provides a method for manufacturing a cylindrical battery, which can improve the safety performance of the battery.

[0063] The manufacturing method for producing the above-mentioned cylindrical battery includes the following steps:

[0064] S0: The first current collector 20 is sleeved on the core 200 and welded to the core 200, so that the first current collector 20 can be connected to the core 10 and the first pole post 310 along the circumference of the core 200, and the connection strength is evenly distributed.

[0065] S1: The electrode sheet is wound along the winding direction to form a core 10. The structure is compact and the internal stress is evenly distributed. It is not easy for the electrode sheet to shift due to vibration or impact. The winding process is a relatively mature existing technology in this field, and will not be described in detail here.

[0066] S2: The core 10 is fitted onto the core 200, and the core 10 is welded to the first current collector 20. The first current collector 20 collects the current of the core 10.

[0067] S3: Insert the core 10 and the tube core 200 together into the shell body 100.

[0068] S4: Weld the first current collector 20 to the first pole post 310 to achieve electrical connection between the core 10 and the outside.

[0069] 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 cylindrical battery casing, characterized in that, include: Shell body (100), one axial end of the shell body (100) is provided with a liquid injection hole; The core (200) is located inside the shell (100), and the two axial ends of the core (200) abut against the inner walls of the two axial ends of the shell (100). The inner wall of the shell (100) and the outer wall of the core (200) form a receiving cavity. One axial end of the core (200) is connected to the injection hole, and the other axial end of the core (200) is connected to the receiving cavity. The core (10) formed by winding the electrode sheet is located inside the receiving cavity, and the core (200) is located in the center hole of the core (10).

2. The cylindrical battery casing according to claim 1, characterized in that, The cylindrical battery casing also includes a first electrode post (310) assembly, which includes a first electrode post (310). The first electrode post (310) passes through the end of the casing body (100) away from the liquid injection hole and abuts against the core (200). The surface of the first electrode post (310) facing the core (200) is provided with a flow guide groove, which connects the core (200) and the receiving cavity. The first electrode post (310) is connected to the winding core (10).

3. The cylindrical battery casing according to claim 2, characterized in that, The guide channel includes a storage tank (311) and an extension channel (312). The storage tank (311) is positioned opposite the core (200). One end of the extension channel (312) is connected to the storage tank (311), and the other end extends radially away from the storage tank (311).

4. The cylindrical battery casing according to claim 3, characterized in that, The extension groove (312) extends radially away from one end of the storage tank (311); and / or, The depth of the storage tank (311) and the extension tank (312) ranges from 0.4mm to 0.6mm, and the width of the extension tank (312) ranges from 2.6mm to 3.0mm.

5. The cylindrical battery casing according to claim 3, characterized in that, The number of the extension grooves (312) is multiple, and the multiple extension grooves (312) are evenly distributed at circumferential intervals along the storage tank (311); and / or, The extension groove (312) has protrusions (313) on both sides of its width, and the core (10) is connected to the protrusions (313).

6. The cylindrical battery casing according to claim 3, characterized in that, The core (200) includes a tube body (210) and a perimeter (220). The perimeter (220) is located at one end of the tube body (210) away from the injection hole and abuts against the first electrode (310). The perimeter (220) extends along the outer periphery of the tube body (210) and is arranged in a closed loop.

7. The cylindrical battery casing according to claim 6, characterized in that, The radial dimension of the storage tank (311) is greater than the radial dimension of the pipe body (210) and smaller than the radial dimension of the surrounding edge (220).

8. The cylindrical battery casing according to any one of claims 1-7, characterized in that, The shell body (100) and the tube core (200) are coaxially arranged.

9. A cylindrical battery, characterized in that, The battery includes a core (10) and a cylindrical battery casing according to any one of claims 1-8, wherein the core (10) is formed by winding electrode sheets and is located inside the casing body (100), and the core (200) is located in the central hole of the core (10).

10. The cylindrical battery according to claim 9, characterized in that, The cylindrical battery also includes a first current collector (20), which is located inside the shell (100) and connected to the winding core (10). The cylindrical battery is electrically connected to the outside through the first current collector (20).

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