Cylindrical battery cover plate and cylindrical battery

Abstract

The utility model belongs to battery technical field, specifically discloses a cylindrical battery cover plate and cylindrical battery, this cylindrical battery cover plate includes cover plate body and current collecting disc, and the current collecting disc and cover plate body compound as the cover plate structure of integrative, and the end face of current collecting disc and cover plate body mutually close each other and mutually adhere and contact electric connection. The end face of current collecting disc side away from cover plate body and the tab welding connection of roll core. The assembly process of this cylindrical battery cover plate and roll core is simple, and the cost is lower, and the large amount of metal particles in the welding process of cover plate body and current collecting disc is avoided, and the short circuit risk is reduced in the later period, and the safety performance is good. In addition, the current collecting disc and cover plate body compound and form the cover plate structure of board shape, can reduce the occupation space of current collecting disc, be favorable to the improvement cylindrical battery's energy density and capacity. The utility model also provides a cylindrical battery, including above-mentioned cylindrical battery cover plate.

Description

Technical Field

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

[0002] Currently, existing cylindrical batteries typically have a full tab structure. The internal core of a cylindrical battery usually uses tabs on both sides, and the tabs are connected to the outer casing / cover plate of the core. Specifically, the core is first connected to the tabs through a current collector structure, and then the current collector structure is welded or spliced ​​to the outer casing / cover plate of the core to achieve circuit conduction.

[0003] However, during the assembly and welding of cylindrical batteries, the current collector structure needs to be welded to the tabs and the casing / cover plate in two steps. On the one hand, the entire assembly process is complex and involves many processing steps, which reduces assembly efficiency; on the other hand, a large number of metal particles are generated during the welding process, which increases the risk of short circuits later. Utility Model Content

[0004] The purpose of this utility model is to provide a cylindrical battery cover and a cylindrical battery, which simplifies the processing steps of electrically connecting the cylindrical battery cover and the core, requiring only one welding step, reducing the risk of short circuits later, and improving the space utilization rate, which is conducive to improving the energy density and capacity of the cylindrical battery.

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

[0006] On one hand, this utility model provides a cylindrical battery cover, which includes:

[0007] The cover plate body; and

[0008] A collector plate, wherein the collector plate and the cover plate body are stacked together along a first direction;

[0009] The current collector and the cover plate body are integrated into a cover plate structure. The end faces of the current collector and the cover plate body that are close to each other are attached to each other and electrically connected. The current collector is located on the side close to the core. The end face of the current collector away from the cover plate body is welded to the tab of the core.

[0010] Optionally, the cover plate body is made of one of stainless steel, carbon steel, and titanium;

[0011] And / or, the material of the current collector is the same as the material of the electrode tab, and the material of the current collector is aluminum or copper.

[0012] Optionally, the cover plate body and the collector plate are composited using one of the following processes: hot rolling composite process, explosive composite process, cold rolling composite process, and vacuum rolling composite process to form the cover plate structure.

[0013] Optionally, the thickness of the cover plate body is T1 along the first direction;

[0014] The value range of T1 is: 0.2mm≤T1≤0.8mm.

[0015] Optionally, the thickness of the collector plate is T2 along the first direction;

[0016] The value range of T2 is: 0.2mm≤T2≤0.6mm.

[0017] Optionally, the cover plate structure is provided with annular or C-shaped grooves, and the inner side of the grooves forms an opening.

[0018] Optionally, the cover plate structure has a circular protrusion at its center, the protrusion extends toward the side where the core is located, the side of the protrusion away from the core forms a recessed area, and the center of the protrusion has an injection hole, the injection hole being coaxial with the protrusion.

[0019] Optionally, the cylindrical battery cover plate further includes a sealing nail and a sealing cap. The sealing nail seals the injection hole, and the sealing cap is disposed in the recessed area and welded to the protrusion.

[0020] On the other hand, this utility model provides a cylindrical battery, including a housing, a winding core, and a cylindrical battery cover plate as described in any of the above embodiments. The winding core is disposed inside the housing, one end of the housing forms an opening, the cylindrical battery cover plate seals the opening, and the tabs of the winding core are welded to the current collector of the cylindrical battery cover plate.

[0021] Optionally, the cylindrical battery cover is a negative electrode cover, and the current collector in the negative electrode cover is connected to the negative electrode tab of the winding core;

[0022] Alternatively, the cylindrical battery cover plate may be a positive electrode cover plate, and the current collector in the positive electrode cover plate may be connected to the positive electrode tab of the winding core.

[0023] The beneficial effects of this utility model are as follows:

[0024] This invention provides a cylindrical battery cover plate, comprising a cover plate body and a current collector. The current collector and the cover plate body are stacked along a first direction, forming a single cover plate structure. The cover plate structure is plate-shaped overall, with the end faces of the current collector and the cover plate body close to each other and in contact with each other. The current collector is located on the side near the core, and the end face of the current collector away from the cover plate body is welded to the tab of the core. This cylindrical battery cover plate has a simple assembly process with low cost, and avoids the problem of generating a large number of metal particles during the welding process between the cover plate body and the current collector, reducing the risk of short circuits and improving safety performance. In addition, the plate-shaped cover plate structure formed by the current collector and the cover plate body reduces the space occupied by the current collector, which is beneficial to improving the energy density and capacity of the cylindrical battery.

[0025] This utility model also provides a cylindrical battery. By integrating the cover plate body and the current collector into a plate-shaped cover plate structure, a welding process can be saved, the assembly steps can be simplified, and the space occupied by the current collector can be reduced. The cylindrical battery has a high space utilization rate, which is conducive to increasing the volume of the core and improving the energy density and capacity of the cylindrical battery. Attached Figure Description

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

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

[0028] Figure 2 This is a top view of the cover plate structure provided in Embodiment 1 of this utility model;

[0029] Figure 3 yes Figure 2 Sectional view of section AA;

[0030] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0031] Figure 5 This is a partial structural schematic diagram of the cylindrical battery provided in Embodiment 1 of this utility model.

[0032] In the picture:

[0033] 100. Cylindrical battery cover; 110. Cover structure; 111. Cover body; 112. Current collector; 120. Score groove; 130. Protrusion; 131. Recessed area; 132. Injection hole; 140. Sealing nail; 150. Sealing cap; 200. Housing; 210. Opening. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," and "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.

[0038] Example 1

[0039] like Figures 1-4As shown, this embodiment provides a cylindrical battery cover 100. The cylindrical battery cover 100, after being assembled with a housing 200, forms an installation space for placing a winding core. The cylindrical battery cover 100, housing 200, and winding core constitute the main parts of the cylindrical battery. The cylindrical battery cover 100 includes a cover body 111 and a current collector 112. The current collector 112 and the cover body 111 are stacked along a first direction, forming a cover structure 110. The cover structure 110 is generally plate-shaped. The end faces of the current collector 112 and the cover body 111 that are close to each other are attached and electrically connected. The current collector 112 is located on the side close to the winding core, and the end face of the current collector 112 facing away from the cover body 111 is welded to the tab of the winding core. The aforementioned first direction is... Figure 3 The Z-axis direction is shown in the figure.

[0040] By combining the cover plate body 111 and the current collector 112 into a single cover plate structure 110, the welding process between the current collector 112 and the cover plate body 111 in conventional battery covers is eliminated. Only the current collector 112 needs to be welded to the tabs of the core. This simplifies the assembly process, reduces costs, and avoids the problem of generating a large number of metal particles during the welding process, thus lowering the risk of short circuits and improving the safety performance of the cylindrical battery cover 100. Furthermore, the cover plate body 111 can fit tightly against the current collector 112, and the end face of the current collector 112 facing the core can serve as the contact surface for connecting to the tabs, creating favorable conditions for welding the tabs to the current collector 112. This facilitates welding, allows for a large welding area, and provides good current carrying capacity. Simultaneously, the combined current collector 112 and cover plate body 111 form a plate-like cover plate structure 110, reducing the space occupied by the current collector 112 and improving the energy density and capacity of the cylindrical battery.

[0041] As an optional solution, the cylindrical battery cover 100 in this embodiment is a negative electrode cover, and its cover body 111 is made of one of stainless steel (SUS), carbon steel (SPCC), and titanium (Ti). Using these materials ensures high mechanical strength of the cover body 111, providing sufficient support for the current collector 112, and the cover body 111 can withstand certain impact forces, ensuring that the cover structure 110 is not easily deformed or damaged. The electrode tab of the winding core is a negative electrode tab, and the negative electrode tab is made of copper (Cu). The current collector 112 is made of the same material as the negative electrode tab, which is also copper (Cu).

[0042] Furthermore, in this embodiment, the cover plate body 111 and the collector plate 112 can be composited into the cover plate structure 110 using one of the following processes: hot rolling composite process, explosive composite process, cold rolling composite process, and vacuum rolling composite process. Exemplarily, in some embodiments, the cover plate body 111 and the collector plate 112 can be composited using a hot rolling composite process. This composite process has high processing efficiency and low cost. The above-mentioned composite processes are mature processes in the prior art and will not be described in detail here.

[0043] See also Figure 4 Along the first direction, the thickness of the cover plate body 111 is T1, and the value of T1 ranges from 0.2mm to 0.8mm. Along the first direction, the thickness of the collecting plate 112 is T2, and the value of T2 ranges from 0.2mm to 0.6mm. In some embodiments, T1 and T2 satisfy the condition: 0mm ≤ T1 - T2 ≤ 0.2mm. For example, when the value of T1 is 0.2mm, the value of T2 can be 0.2mm. When the value of T1 is 0.3mm, the value of T2 can be 0.2mm or 0.3mm. When the value of T1 is 0.4mm, the value of T2 can be 0.2mm, 0.3mm, or 0.4mm, etc. When the value of T1 is 0.6mm, the value of T2 can be 0.4mm, 0.5mm, or 0.6mm, etc. When the value of T1 is 0.8mm, the value of T2 can be 0.6mm. By limiting the values ​​of T1, T2, and T1-T2 to the above range, the thickness difference between the cover plate body 111 and the current collector 112 is kept small. The cover plate body 111 can provide good support for the current collector 112, and the current collector 112 can achieve good conductivity and current carrying performance.

[0044] It should be noted that along the first direction, the total thickness of the cover structure 110 is T, where T = T1 + T2. The value of T ranges from 0.4 mm to 1.4 mm. By limiting the value of T within this range, the mechanical properties of the cover structure 110 are ensured to be good, enabling it to resist external impacts and thus protecting the internal core of the cylindrical battery from damage, resulting in high safety and reliability.

[0045] See also Figures 1-4 The cover plate structure 110 has an annular or C-shaped groove 120, the inner side of which forms an opening. The groove 120 can be formed by stamping or etching. Part of the groove 120 is located on the cover plate body 111, and part is located on the current collector 112. The opening of the groove 120 can face towards the core or away from the core. When the pressure inside the cylindrical battery is too high, the groove 120 breaks, the opening flips open to one side, and the gas inside the cylindrical battery can be released through the channel formed at the opening, thereby avoiding the risk of explosion of the cylindrical battery.

[0046] Furthermore, the cover plate structure 110 has a circular protrusion 130 at its center, which is formed by stamping. The protrusion 130 extends toward the side where the core is located, and a recessed area 131 is formed on the side of the protrusion 130 away from the core. An injection hole 132 is provided at the center of the protrusion 130, and the injection hole 132 is coaxial with the protrusion 130. Electrolyte can be injected into the mounting space of the cylindrical battery through the injection hole 132, so that the core is immersed in the electrolyte, thereby achieving charging and discharging performance.

[0047] See Figure 5 The cylindrical battery cover 100 also includes a sealing nail 140 and a sealing cap 150. The sealing nail 140 seals the electrolyte injection hole 132, forming a first sealing structure. The sealing cap 150 is located in the recessed area 131 and is welded to the protrusion 130, forming a second sealing structure. This dual-sealing design ensures a good seal at the electrolyte injection hole 132, reducing the risk of electrolyte leakage. Furthermore, placing the sealing cap 150 in the recessed area 131 provides good protection for both sealing structures, minimizing the risk of impacts and collisions, thus improving the sealing performance and reliability of the cylindrical battery.

[0048] This embodiment also provides a cylindrical battery, see [link / reference] Figure 5 The cylindrical battery includes a housing 200, a winding core (not shown in the figure), and the aforementioned cylindrical battery cover plate 100. The winding core is disposed inside the housing 200, and an opening 210 is formed at one end of the housing 200. The cylindrical battery cover plate 100 seals the opening 210, and the cylindrical battery cover plate 100 and the housing 200 together form an installation space for placing the winding core.

[0049] In this embodiment, the cylindrical battery cover plate 100 is a negative electrode cover plate. Positive and negative electrode tabs are respectively led out from opposite sides of the winding core along the first direction. The cover plate structure 110 of the negative electrode cover plate is welded to the inner wall of the housing 200 at the end with the opening 210. The current collector 112 of the cover plate structure 110 is welded to the negative electrode tab of the winding core. A terminal post is provided on the side of the housing 200 opposite to the negative electrode cover plate, and the terminal post is electrically connected to the positive electrode tab of the winding core. The terminal post is the positive electrode of the cylindrical battery, and the cover plate structure 110 is the negative electrode of the cylindrical battery. By combining the cover plate body 111 and the current collector 112 into a plate-shaped cover plate structure 110, a welding process can be saved, the assembly steps can be simplified, and the space occupied by the current collector 112 can be reduced. The internal space utilization of the cylindrical battery is high, which is beneficial for increasing the volume of the winding core and improving the energy density and capacity of the cylindrical battery.

[0050] Example 2

[0051] This embodiment provides a cylindrical battery cover 100, which differs from the cylindrical battery cover 100 in Embodiment 1 in that: the cylindrical battery cover 100 in this embodiment is a positive electrode cover, and the current collector 112 in the positive electrode cover is connected to the positive electrode tab of the winding core.

[0052] The cover body 111 of the positive electrode cover structure 110 is made of one of stainless steel (SUS), carbon steel (SPCC), or titanium (Ti). Using these materials ensures high mechanical strength of the cover body 111, providing sufficient support for the current collector 112, and the cover body 111 can withstand certain impact forces, ensuring that the cover structure 110 is not easily deformed or damaged. The positive electrode tab of the core is made of aluminum (Al). The current collector 112 is made of the same material as the positive electrode tab, also aluminum (Al).

[0053] This embodiment also provides a cylindrical battery. Positive and negative tabs are led out from opposite sides of the winding core along a first direction. The periphery of the cover plate structure 110 in the positive electrode cover is welded to the inner wall of the housing 200 at the end with the opening 210. The current collector 112 of the cover plate structure 110 is welded to the positive tab of the winding core. A terminal post is provided on the side of the housing 200 opposite to the positive electrode cover, and the terminal post is electrically connected to the negative tab of the winding core. The terminal post is the negative electrode of the cylindrical battery, and the cover plate structure 110 is the positive electrode of the cylindrical battery. By combining the cover plate body 111 and the current collector 112 into a plate-shaped cover plate structure 110, a welding process can be saved, the assembly steps can be simplified, and the space occupied by the current collector 112 can be reduced. The internal space utilization of the cylindrical battery is high, which is beneficial for increasing the volume of the winding core and improving the energy density and capacity of the cylindrical battery.

[0054] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0055] 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 cover, characterized in that, include: Cover plate body (111); as well as A collector plate (112) is stacked with the cover plate body (111) along a first direction; the collector plate (112) and the cover plate body (111) are combined into a cover plate structure (110), the end faces of the collector plate (112) and the cover plate body (111) are close to each other and are electrically connected, the collector plate (112) is located on the side close to the core, and the end face of the collector plate (112) away from the cover plate body (111) is welded to the tab of the core.

2. The cylindrical battery cover plate according to claim 1, characterized in that, The cover plate body (111) is made of one of stainless steel, carbon steel and titanium; And / or, the material of the collector plate (112) is the same as the material of the tab, and the material of the collector plate (112) is aluminum or copper.

3. The cylindrical battery cover plate according to claim 1 or 2, characterized in that, The cover plate body (111) and the collecting plate (112) are combined using one of the following processes: hot rolling composite process, explosive composite process, cold rolling composite process and vacuum rolling composite process to form the cover plate structure (110).

4. The cylindrical battery cover plate according to claim 1, characterized in that, Along the first direction, the thickness of the cover plate body (111) is T1, and the value range of T1 is: 0.2mm≤T1≤0.8mm.

5. The cylindrical battery cover plate according to claim 1, characterized in that, Along the first direction, the thickness of the collector plate (112) is T2, and the value range of T2 is: 0.2mm≤T2≤0.6mm.

6. The cylindrical battery cover plate according to claim 1, characterized in that, The cover plate structure (110) is provided with annular or C-shaped grooves (120), and the inner side of the grooves (120) forms an opening.

7. The cylindrical battery cover plate according to claim 1, characterized in that, The cover plate structure (110) has a circular protrusion (130) at its center. The protrusion (130) extends toward the side where the core is located. The side of the protrusion (130) away from the core forms a recessed area (131). The center of the protrusion (130) has an injection hole (132) and the injection hole (132) is coaxial with the protrusion (130).

8. The cylindrical battery cover plate according to claim 7, characterized in that, The cylindrical battery cover (100) also includes a sealing nail (140) and a sealing cap (150). The sealing nail (140) is used to seal the injection hole (132), and the sealing cap (150) is disposed in the recessed area (131). The sealing cap (150) is welded to the protrusion (130).

9. A cylindrical battery, characterized in that, The battery includes a housing (200), a core, and a cylindrical battery cover (100) according to any one of claims 1-8. The core is disposed inside the housing (200), one end of the housing (200) forms an opening (210), the cylindrical battery cover (100) is sealed in the opening (210), and the tabs of the core are welded to the current collector (112) of the cylindrical battery cover (100).

10. The cylindrical battery according to claim 9, characterized in that, The cylindrical battery cover (100) is a negative electrode cover, and the current collector (112) in the negative electrode cover is connected to the negative electrode tab of the winding core; Alternatively, the cylindrical battery cover (100) may be a positive electrode cover, and the current collector (112) in the positive electrode cover may be connected to the positive electrode tab of the winding core.

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