Cylindrical battery cap assembly and battery

Abstract

Cylindrical battery cap assembly applied to a battery, wherein the battery comprises a battery cell, the battery cell comprises an electrode tab, the electrode tab comprises a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab are arranged on the same side of the battery cell; wherein the cylindrical battery cap assembly comprises: a terminal block; and a current collector (1) comprising a tab connection area and a terminal connection area, wherein the tab connection area is connected to the electrode tab, the terminal connection area is connected to the terminal to establish an electrical connection between the electrode tab and the terminal, wherein the thickness of the terminal connection area is a, the thickness of the tab connection area is b, and the ratio of the thickness b to the thickness a is 0.2 ≤ b / a < 1.

Description

Technical field

[0001] The present application relates to the field of new energy battery technology and specifically to a cylindrical battery cap arrangement and a battery. background

[0002] Cylindrical batteries are widely used due to their high capacity, long lifespan, and wide operating temperature range. In cylindrical batteries, the positive and negative electrodes are drawn from the same end, and the current collector must be welded to the electrode tabs and terminal posts or clamps within the cap assembly. During electrode tab welding and battery operation, a significant amount of heat is generated at the connection between the electrode tabs and the current collectors. If the current collector is too thick, heat concentrates in the tab connection area, resulting in poor heat dissipation. Conversely, if the current collector is too thin, this affects the current-carrying capacity of the tab connection area and the battery's performance. Therefore, existing current collectors may not meet the requirements. Summary

[0003] In view of this, the present application provides a cylindrical battery cap arrangement and a battery to solve the problems that if the current collector is too thin, the heat dissipation performance is poor, and if the current collector is too thick, the current carrying capacity is poor.

[0004] According to a first aspect, the present application provides a cylindrical battery cap arrangement applied to a battery, the battery comprising a battery cell. The battery cell comprises an electrode tab, the electrode tab comprising a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab being located on the same side of the battery cell. The cylindrical battery cap arrangement comprises the following: a terminal block; A current collector comprising a tab connection area and a terminal connection area, wherein the tab connection area is connected to the electrode tab and the terminal connection area is connected to the terminal to establish an electrical connection between the electrode tab and the terminal. The thickness of the terminal connection area is a, the thickness of the tab connection area is b, and the ratio of thickness b to thickness a satisfies 0.2 b / a < 1.

[0005] Advantageous effects: The cap arrangement of the present application comprises a terminal and a current collector. The current collector includes a tab connection area and a terminal connection area, wherein the tab connection area is connected to the electrode tab and the terminal connection area is connected to the terminal. The ratio of the thickness b of the tab connection area to the thickness a of the terminal area satisfies 0.2 b / a < 1. If the ratio of the thickness b of the tab connection area to the thickness a of the terminal area is higher than this value, the tab connection area would be too thick, resulting in poor heat dissipation performance. If the ratio is lower than this value, the tab connection area would be too thin, affecting its current-carrying capacity.

[0006] According to this application, the thickness of the current collector is not uniform; rather, the thickness of the tab connection area is smaller than that of the terminal connection area. Because the tab connection area is located relatively far from the cap body in the cap assembly, its heat dissipation performance is relatively poor. If the ratio of the thickness b of the tab connection area to the thickness a of the terminal connection area is less than 0.2 b / a < 1, the heat dissipation capacity of the current collector can be improved, thus increasing the heat dissipation performance of the tab connection area.During battery operation, a large amount of heat generated by the electrode tab can be dissipated through the tab connection area of ​​the current collector, thus cooling the electrode tab and the tab connection area, reducing heat concentration problems, extending the battery service life, and ensuring the current carrying capacity of the tab connection area, thereby improving battery performance.

[0007] According to a second aspect, the present application provides a battery comprising the aforementioned cylindrical battery cap assembly and a battery cell. The battery cell comprises an electrode tab, the electrode tab being connected to the tab connection area of ​​the current collector in the cap assembly. An orthographic projection area of ​​the electrode tab on the current collector is c, an area of ​​the tab connection area is d, and the ratio of area c to area d satisfies 0.5 c / d < 1.

[0008] Because the battery of the present application contains the cylindrical battery cap arrangement of the present application, it has the same advantageous effects as the cylindrical battery cap arrangement, which are not repeated here. Brief description of the drawings

[0009] To more clearly illustrate the technical solutions according to the specific embodiments of the present application or in the prior art, the drawings necessary for describing the specific embodiments or the prior art are briefly presented below. Obviously, the drawings described below represent some embodiments of the present application. Those skilled in the field can derive other drawings from these without any creative effort. Fig. Figure 1 is an exploded view of the cap arrangement (with some hidden structures) of the present application; Fig. 2 is a sectional view of the cap arrangement of the present application; Fig. Figure 3 is a schematic view of the current collector in the cap arrangement of the present application; Fig. Figure 4 is an exploded view of the current collector in the cap arrangement of the present application; Fig. Figure 5 is a schematic overview of the battery of the present application. Reference symbol:

[0010] 1. Current collector; 2. Positive current collector; 201. Positive tab connection area; 202. Positive connection area; 203. Connection plate; 3. Negative current collector; 301. Negative tab connection area; 302. Negative connection area; 4. positive terminal (cap body); 5. negative terminal; 6. Nut; 7. Lead; 8. Insulator; 801. First hollow section; 802. Second hollow section; 9. Battery housing; 10. Flange. Detailed description

[0011] To clarify the purpose, technical solutions, and advantages of the embodiments of the present application, the technical solutions according to the embodiments of the present application are described below in detail, in conjunction with the drawings according to the embodiments of the present application. Obviously, the described embodiments represent only a subset of the embodiments of the present application, rather than all embodiments. All other embodiments that could be obtained by those skilled in the art based on the embodiments of the present application without any creative effort fall within the scope of protection of the present application.

[0012] The embodiments of the cylindrical battery cap arrangement and the battery of the present application are described below in conjunction with the Fig. 1-5 described.

[0013] According to one embodiment of the present application, a cylindrical battery cap assembly is provided. The cylindrical battery cap assembly is applied to a battery, the battery comprising a battery cell. The battery cell comprises an electrode tab, the electrode tab comprising a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab are arranged on the same side of the battery cell. The cylindrical battery cap assembly comprises a terminal and a current collector 1, the current collector 1 comprising a tab connection area and a terminal connection area. The tab connection area is connected to the electrode tab, while the terminal connection area is connected to the terminal to establish an electrical connection between the electrode tabs and the terminal.The thickness of the connection area is a, the thickness of the tab connection area is b, and the ratio of thickness b to thickness a satisfies 0.2 b / a < 1.

[0014] This cap assembly comprises a terminal and a current collector, the current collector 1 comprising a tab connection area and a terminal connection area. The tab connection area is connected to the electrode tab, while the terminal connection area is connected to the terminal. The ratio of the thickness b of the tab connection area to the thickness a of the terminal connection area satisfies 0.2 b / a < 1. If this ratio is higher than the specified range, the thickness of the tab connection area would be too large, resulting in poor heat dissipation performance. If the ratio is lower than the specified range, the thickness of the tab connection area would be too small, affecting its current-carrying capacity.

[0015] According to this application, the thickness of the current collector 1 is not uniform. Instead, the tab connection area is thinner than the terminal connection area. Because the tab connection area is located relatively far from the cap body in the cap assembly, the heat dissipation performance of the tab connection area is relatively poor. If the ratio of the thickness b of the tab connection area to the thickness a of the terminal connection area satisfies 0.2 b / a < 1, the heat dissipation capacity of the current collector can be balanced, thus improving the heat dissipation performance of the tab connection area.During battery operation, a large amount of heat generated by the electrode tabs can be dissipated through the tab connection area of ​​the current collector, thus cooling the electrode tab and the tab connection area, reducing the heat concentration problem, extending the battery's lifespan, and ensuring the current carrying capacity of the tab connection area, thereby improving battery performance.

[0016] The cylindrical battery cap arrangement of this embodiment is applied to a battery in which the positive and negative electrodes are drawn from the same side. Specifically, it is a cylindrical battery comprising a battery cell. The battery cell contains electrode tabs, each comprising a positive and a negative electrode tab, arranged on the same side of the battery cell to facilitate the withdrawal of the positive and negative electrodes from the same side. This type of cylindrical battery with a positive and a negative electrode on the same side exhibits a compact structure and small volume. Accordingly, the structures, such as the current collector 1, are also relatively small.

[0017] According to this embodiment, the cylindrical battery cap assembly has a circular overall structure to fit the cylindrical battery, being located on the side of the battery cell where the positive and negative electrode tabs are located to facilitate subsequent electrode tab connection operations.

[0018] The cylindrical battery cap assembly comprises a terminal and a current collector 1. The terminal is primarily used to apply the battery voltage. The current collector 1 comprises a tab connection area and a connection connection area, the tab connection area being connected to the electrode tab and the connection connection area being connected to the terminal. Naturally, the cylindrical battery cap assembly also includes other structures commonly found in existing cylindrical battery cap assemblies, such as safety valves, which are not described in detail here because they are not included in this embodiment.

[0019] According to this embodiment, the thickness of the tab connection area differs from that of the terminal connection area, meaning that the overall thickness of the current collector 1 is not uniform. Specifically, the ratio of the thickness b of the tab connection area to the thickness a of the terminal connection area is 0.2 b / a < 1. Within this ratio range, the thickness of the tab connection area is neither too large nor too small, ensuring both good heat dissipation performance and a balanced heat dissipation capacity of the current collector, while also ensuring the current-carrying capacity of the tab connection area, thereby meeting the battery performance requirements and extending the battery's service life.

[0020] According to this embodiment, the thickness b of the tab connection area is in the range of 0.1 mm to 1 mm, where thickness b can be, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, and the like. The thickness a of the connecting connection area is in the range of 0.2 mm to 2 mm, where thickness a can be, for example, 0.2 mm, 0.5 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, etc. The ratio of the thickness b of the tab connection area to the thickness a of the connecting connection area can be 0.2, 0.4, 0.5, 0.8, 0.95, and the like.

[0021] Furthermore, the current collector 1 comprises a positive current collector 2 and a negative current collector 3. The positive current collector 2 comprises a positive tab connection area 201 and a positive terminal connection area 202, while the negative current collector 3 comprises a negative tab connection area 301 and a negative terminal connection area 302. The positive terminal connection area 202 or the negative terminal connection area 302 is arranged between the positive tab connection area 201 and the negative tab connection area 301, wherein the ratio of thickness b to thickness a satisfies 0.25 b / a ≤ 0.9.

[0022] The current collector 1 comprises the positive current collector 2 and the negative current collector 3, which can be integrated into a single structure while remaining isolated from each other, being arranged on the side of the battery cell where the electrode tabs are located.

[0023] The positive current collector 2, also known as the positive current collector disk, and the negative current collector 3, also known as the negative current collector disk, are designed to connect to the positive electrode tab and positive terminal, and the negative electrode tab and negative terminal, respectively, of the battery. Typically, the positive current collector 2 is welded to the positive electrode tab and positive terminal, and similarly, the negative current collector 3 is welded to the negative electrode tab and negative terminal. The positive current collector 2 is made of aluminum, while the negative current collector 3 is made of copper. Both the positive current collector 2 and the negative current collector 3 are plate-like structures of a specific thickness, designed for installation within the battery.

[0024] The positive current collector 2 comprises a positive tab connection area 201 and a positive connection connection area 202, which are connected to each other. As shown in the Fig. As shown in Figures 3-4, the positive current collector 2 in this embodiment has an overall disk shape with a hollow center. The positive terminal connection area 202 forms an outer circular ring structure, with the positive tab connection area 201 located on the inside of the positive terminal connection area 202. When the positive current collector 2 is arranged horizontally, the horizontal position of the positive tab connection area 201 is lower than that of the positive terminal connection area 202, meaning that the positive tab connection area 201 is recessed downwards relative to the positive terminal connection area 202. The terminal block includes a positive terminal 4 and a negative terminal 5.The positive tab connection area 201 is connected to the positive electrode tab, while the positive terminal connection area 202 is connected to the positive terminal 4, these connections typically being made by welding. Optionally, the positive tab connection area 201 and the positive connection connection area 202 are designed as a single piece.

[0025] The negative current collector 3 comprises a negative tab connection area 301 and a negative terminal connection area 302, which are connected to each other. Specifically, the negative terminal connection area 302 is located on the inside of the negative tab connection area 301. When the negative current collector 3 is arranged horizontally, the negative terminal connection area 302 projects upwards relative to the negative tab connection area 301 to facilitate connection with the negative terminal. The negative tab connection area 301 is connected to the negative electrode tab, while the negative terminal connection area 302 is connected to the negative terminal 5, with these connections typically being made by welding.

[0026] Optionally, the negative tab connection area 301 and the negative connection connection area 302 can be formed in one piece.

[0027] The positive terminal connection area 202 or the negative terminal connection area 302 is located between the positive tab connection area 201 and the negative tab connection area 301. Cylindrical batteries are divided into cylindrical batteries with steel casings and cylindrical batteries with aluminum casings. In cylindrical batteries with steel casings, the negative terminal connection area 302 is located between the positive tab connection area 201 and the negative tab connection area 301, while in cylindrical batteries with aluminum casings, the positive terminal connection area 202 is located between the positive tab connection area 201 and the negative tab connection area 301. As shown in the Fig. 1 and Fig. As shown in Figure 4, according to this embodiment the cylindrical battery cap arrangement is applied to a cylindrical battery with a steel housing, in which the negative terminal connection area 302 is arranged between the positive tab connection area 201 and the negative tab connection area 301.

[0028] In this case, the ratio of thickness b to thickness a satisfies the condition 0.25 b / a ≤ 0.9. According to this embodiment, the negative connection area 302 is arranged between the positive tab connection area 201 and the negative tab connection area 301. Because the tab connection areas (the positive tab connection area 201 and the negative tab connection area 301) are arranged on both sides of the connection area (the negative connection area 302), the overall heat dissipation capacity of the tab connection areas can be improved, ensuring balanced heat dissipation from the tab connection areas on both sides of the connection area.Therefore, the lower limit of the ratio between the thickness b of the lug connection area and the thickness a of the terminal connection area can be set to a larger value, thus increasing the thickness of the lug connection area to achieve better current transmission performance. The ratio of thickness b to thickness a can be, for example, 0.25, 0.4, 0.7, 0.9, and so on.

[0029] Furthermore, the positive tab connection area 201 and the negative tab connection area 301 each comprise a sector-shaped structure, arranged either around the positive connection area 202 or around the negative connection area 302. The sum of the central angles of the positive tab connection area 201 and the negative tab connection area 301 is in the range of 150° to 350°, where the ratio of thickness b to thickness a is 0.28 b / a 0.85, and the central angles of both the positive tab connection area 201 and the negative tab connection area 301 range from 75° to 175°.

[0030] The positive tab connection area 201 and the negative tab connection area 301 each comprise a sector-shaped structure and are arranged either around the positive connection connection area 202 or around the negative connection connection area 302. According to this embodiment, the positive tab connection area 201 and the negative tab connection area 301 are arranged around the negative connection connection area 302, with the negative connection connection area 302 being located at the central position of the positive tab connection area 201 and the negative tab connection area 301.

[0031] The sum of the central angles of the positive lug connection area 201 and the negative lug connection area 301 lies in the range of 150° to 350°, so that the fixing ranges of the positive lug connection area 201 and the negative lug connection area 301 are sufficiently large, thus ensuring the current-carrying capacity of the positive lug connection area 201 and the negative lug connection area 301. The sum of the central angles of the positive lug connection area 201 and the negative lug connection area 301 can be, for example, 150°, 210°, 300°, 350°, and the like.

[0032] In this case, the ratio of thickness b to thickness a is 0.28 b / a ≤ 0.85. Because the areas of the positive tab connection region 201 and the negative tab connection region 301 are sufficiently large, they can, according to this embodiment, improve the overall heat dissipation capacity of the tab connection regions and ensure balanced heat dissipation of the tab connection regions on both sides of the connection area. Therefore, the lower limit of the ratio between the thickness b of the tab connection region and the thickness a of the connection area can be set to a larger value, thus increasing the size of the tab connection region to achieve better current flow. The ratio of thickness b to thickness a can be, for example, 0.28, 0.3, 0.6, 0.85, and the like.

[0033] According to this embodiment, the central angle range of the positive tab connection area 201 is 75° to 175°. The central angle of the positive tab connection area 201 can be, for example, 75°, 82°, 120°, 175°, etc. Similarly, the central angle range of the negative tab connection area 301 is also 75° to 175°. The central angle of the negative tab connection area 301 can be, for example, 75°, 95°, 110°, 175°, and the like. However, the central angles of the positive tab connection area 201 and the negative tab connection area 301 are not necessarily the same; they can be either the same or different.

[0034] Furthermore, the connection area located between the positive tab connection area 201 and the negative tab connection area 301 is made of copper. The ratio of the thickness of the positive tab connection area 201 to the thickness of the positive connection area 202 is in the range of 0.3 to 0.8, while the ratio of the thickness of the negative tab connection area 301 to the thickness of the negative connection area 302 is also in the range of 0.3 to 0.8.

[0035] The connection area located between the positive lug connection area 201 and the negative lug connection area 301 is made of copper; that is, the connection area located between the positive lug connection area 201 and the negative lug connection area 301 is the negative connection area 302. In this case, the ratio of the thickness of the positive lug connection area 201 to the thickness of the positive connection area 202 is in the range of 0.3 to 0.8. This ratio can be, for example, 0.3, 0.5, 0.7, 0.8, and so on. Similarly, the ratio of the thickness of the negative lug connection area 301 to the thickness of the negative connection area 302 is also in the range of 0.3 to 0.8. This ratio can be, for example, 0.3, 0.65, 0.75, 0.8, and so on.Due to the better heat dissipation performance of copper, the lower limit of the ratio range between the thickness b of the tab connection area and the thickness a of the terminal connection area of ​​the same polarity can be set to a larger value, thus increasing the thickness of the tab connection area, thereby achieving good heat dissipation and current carrying capacity at the same time.

[0036] Furthermore, the positive current collector 2 and the negative current collector 3 are connected via an insulator 8, wherein the ratio of the thickness of the negative tab connection area 301 to the thickness of the positive tab connection area 201 is in the range of 0.5 to 1.

[0037] As in the Fig. 3 and Fig. As shown in Figure 4, according to this embodiment, the current collector 1 is an integrated, unified structure; that is, the positive current collector 2 and the negative current collector 3 are integrated into a single structure while being insulated from each other. Specifically, the positive current collector 2 and the negative current collector 3 are connected in a unified structure via the insulator 8, meaning that the insulator 8 is connected to both the positive current collector 2 and the negative current collector 3, so that the positive current collector 2, the negative current collector 3, and the insulator 8 form a single structure, which is the current collector 1.

[0038] The insulator 8 consists of insulating materials, such as resin or plastic, and the positive current collector 2, the negative current collector 3, and the insulator 8 can be joined together by thermal fusion, injection molding, or other methods. Once the positive current collector 2 and the negative current collector 3 are connected to the insulator 8, they remain insulated from each other. Additionally, the positive current collector 2 and the negative current collector 3 are positioned on the side of the battery cell where the electrode tabs are located to facilitate subsequent tab connection.

[0039] The insulator 8 has a circular overall structure, with its outer circular structure designed to fit the positive terminal connection area 202. The central part of the insulator 8 is provided with two hollow sections, namely a first hollow section 801 and a second hollow section 802. The first hollow section 801 corresponds to and is adapted to the negative current collector 3, which is located on the first hollow section 801. The second hollow section 802 corresponds to and is adapted to the positive tab connection area 201, which is located on the second hollow section 802.

[0040] In this case, the ratio of the thickness of the negative tab connection area 301 to the thickness of the positive tab connection area 201 is in the range of 0.5 to 1. When connecting the positive current collector 2 and the negative current collector 3 via the insulator 8, because the connection position of the insulator 8 is relatively close to the tab connection areas, the thickness ratio between the positive tab connection area 201 and the negative tab connection area 301 must be within the above range to prevent an excessive thickness difference between them, which could make it difficult to fasten the insulator 8 and could potentially cause the entire current collector 1 to tip over.

[0041] The ratio of the thickness of the negative tab connection area 301 to the thickness of the positive tab connection area 201 can be, for example, 0.5, 0.7, 1, and the like. If the thickness ratio between the positive tab connection area 201 and the negative tab connection area 301 is within this range, the difference in thickness between them is not too great, so that the insulator 8 can be easily connected to and attached to the positive current collector 2 and the negative current collector 3, preventing the entire current collector 1 from tipping over.

[0042] To facilitate shaping, the thickness of the terminal connection area of ​​current collector 1 is uniform, as is the thickness of the tab connection area. Within the terminal connection area, one portion is welded to the terminal clamp, while another portion is not welded, with the unwelded portion being the effective area of ​​the terminal connection area. Similarly, within the tab connection area, one portion is welded to the electrode tab, while another portion is not welded, with the unwelded portion being the effective area of ​​the tab connection area. During measurement, the thickness of the effective area of ​​the terminal connection area can be used to represent the thickness of the entire terminal connection area. Similarly, the thickness of the effective area of ​​the tab connection area can be used to represent the thickness of the entire tab connection area.

[0043] Furthermore, the positive tab connection area 201 and the negative tab connection area 301 are arranged either around the positive connection area 202 or around the negative connection area 302. The ratio of the central angle of the positive tab connection area 201 to the central angle of the negative tab connection area 301 is in the range of 0.5 to 1, where the ratio of thickness b to thickness a is 0.6 b / a ≤ 0.8.

[0044] As in the Fig. 1, Fig. 3 and Fig. As shown in Figure 4, according to this embodiment, the cylindrical battery cap arrangement is applied to a cylindrical battery with a steel casing, and therefore the positive tab connection area 201 and the negative tab connection area 301 are arranged around the negative terminal connection area 302. The positive tab connection area 201 and the negative tab connection area 301 comprise sector-shaped structures. The positive tab connection area 201 includes a sector-shaped structure that is connected to the positive electrode tab. The connecting plates 203 project outwards from both sides of the sector-shaped structure and are used for connecting to the insulator 8. The ratio of the central angle of the positive tab connection area 201 to the central angle of the negative tab connection area 301 is in the range of 0.5 to 1. This ratio can be, for example, 0.5, 0.7, 0.9, 1, and the like.

[0045] In this case, the ratio of thickness b to thickness a is 0.6 b / a ≥ 0.8. Because the ratio of the central angle of the positive tab connection area 201 to that of the negative tab connection area 301 lies within the above range, these central angles are relatively close to each other. In this case, the lower limit of the ratio of thickness b to thickness a can be set to a larger value, thus increasing the thickness of the tab connection area to achieve a better current flow effect.

[0046] Furthermore, the connection area is provided with a projection 7, whereby the ratio of thickness b to thickness a is 0.2 b / a 0.8.

[0047] According to this embodiment, the projection 7 is provided on the negative terminal connection area 302, projecting towards the negative terminal 5. In this case, the ratio of thickness b to thickness a is 0.2 b / a ≤ 0.8. The cylindrical battery cap assembly also includes a cap body. With the projection 7 on the terminal connection area, the contact area between the terminal connection area and the cap body is increased, thus improving heat dissipation. Therefore, the terminal connection area can be made thicker; that is, the upper limit of the ratio between thickness b and thickness a can be set to a smaller value. The ratio of thickness b to thickness a can be, for example, 0.2, 0.42, 0.68, 0.8, and the like.

[0048] Furthermore, the terminal block has a groove 6 oriented towards the current collector 1. The projection 7 is at least partially located within the groove 6 and is connected to the terminal block. A flange 10 is provided at the edge of the groove 6 near the current collector 1. The flange 10 is located between the current collector 1 and the cap body. The overlap area between the flange 10 and the tab connection area is m, the area of ​​the tab connection area is d, and the ratio of area m to area d is 0.05 m / d ≤ 0.4.

[0049] As in the Fig. As shown in Figures 1-2, the cylindrical battery cap assembly also includes a cap body having a disc-shaped overall structure with a diameter corresponding to that of the current collector 1. The cap body serves as the positive terminal 4, with a through-hole formed in the center of the cap body. A section of the negative terminal 5 is designed to pass through this through-hole to allow an assembly connection between the negative terminal 5 and the positive terminal 4. After assembly, the negative terminal 5 and the positive terminal 4 are insulated from each other. For example, an insulating ring may be provided at the connection point between the negative terminal 5 and the positive terminal 4.

[0050] After the negative terminal 5 and the positive terminal 4 are assembled, one side of the negative terminal 5 points towards the current collector 1. If the Fig. The perspective shown in Figure 1, taken as an example, shows the underside of the negative terminal 5 facing the current collector 1. The side of the negative terminal 5 facing the current collector 1 corresponds to the negative connection area 302.

[0051] The terminal block has a groove 6 oriented towards the current collector 1. Specifically, the negative terminal block 5 has a groove 6 oriented towards the current collector 1, meaning that the opening of the groove 6 faces the current collector 1. The projection 7 extends towards the negative terminal block 5, with the size and shape of the groove 6 being adapted to those of the projection 7. The projection 7 is at least partially inserted into and arranged within the groove 6. According to this embodiment, the cross-sections of the groove 6 and the projection 7 are both circular perpendicular to the axial direction, their axial direction being defined by the Fig. The perspective shown in Figure 1 is the upward-downward direction. The inner wall of the groove 6 and the outer wall of the projection 7 have a clearance fit. According to this embodiment, the groove 6 and the projection 7 form a circumferential clearance fit, so that the projection 7 can be inserted smoothly and easily into the groove 6, which facilitates the subsequent welding between the projection 7 and the negative terminal 5.

[0052] A flange 10 is provided at the edge of the groove 6 on the side near the current collector 1 and is arranged between the current collector 1 and the cap body to improve the reliability of the structural connection. The flange 10 is positioned between the current collector 1 and the cap body. The overlap area between the flange 10 and the lug connection area is m, the area of ​​the lug connection area is d, and the ratio of area m to area d satisfies 0.05 ≤ m / d ≤ 0.4. According to this embodiment, the overlap area between the flange 10 and the negative lug connection area 301 is m, the area of ​​the negative lug connection area 301 is d, and the ratio of area m to area d satisfies 0.05 ≤ m / d ≤ 0.4. The ratio of area m to area d can be, for example, B. 0.05, 0.09, 0.2, 0.4 and the like.Flange 10 and the tab connection area have a certain overlap, which helps improve heat dissipation performance. However, the overlap area should not be too large to avoid the risk of insulation failure. If the ratio of area m to area d is within the range described above, it is advantageous to improve heat dissipation performance while ensuring insulation reliability.

[0053] This embodiment also provides a battery comprising the aforementioned cylindrical battery cap assembly and a battery cell. The battery cell includes the electrode tabs, which are connected to the tab connection area of ​​the current collector in the cap assembly. The orthographic projection area of ​​the electrode tabs on the current collector 1 is c, the area of ​​the tab connection area is d, and the ratio of area c to area d satisfies 0.5 ≤ c / d < 1.

[0054] As in Fig.As shown in Figure 5, the battery of this embodiment is a battery with a positive and a negative electrode that are drawn out from the same side; specifically, it is a cylindrical battery. The battery has a battery housing 9, wherein structures such as a battery cell and a cap assembly are arranged within the battery housing 9. The battery cell contains a positive and a negative electrode tab that are arranged on the same side of the battery cell to enable the positive and negative electrodes to be drawn out from the same side. Of course, the battery of this embodiment also has other structures and components that are common in existing batteries and which are not described in detail here.

[0055] During battery manufacturing, the positive electrode tab and the positive terminal 4 are connected to the positive current collector 2, which is then connected to the battery housing 9. The negative electrode tab and the negative terminal 5 are connected to the negative current collector 3.

[0056] The orthographic projection area of ​​the battery cell electrode tabs onto the current collector 1 is c, while the area d of the tab connection area is d. The ratio of c to d satisfies 0.5 ≤ c / d < 1. The ratio of area c to area d can be, for example, 0.5, 0.7, 0.95, and the like. If the ratio of area c to area d is within this range, sufficient space can be reserved for heat dissipation while ensuring the current-carrying capacity of the tab connection area.

[0057] Furthermore, several electrode tabs are provided and spaced apart in the circumferential direction, with the gap between adjacent electrode tabs ranging from 0.05 mm to 1 mm.

[0058] According to this embodiment, multiple electrode tabs are provided, meaning there are multiple positive electrode tabs and multiple negative electrode tabs. These multiple electrode tabs are spaced circumferentially, with the positive and negative electrode tabs naturally being kept at a specific distance from each other to ensure insulation. The gap between adjacent electrode tabs is in the range of 0.05 mm to 1 mm. For example, the gap between adjacent electrode tabs can be 0.05 mm, 0.068 mm, 0.08 mm, 1 mm, and so on. If the gap between adjacent electrode tabs is within this range, space can be reserved for heat dissipation, thereby improving heat dissipation performance.

[0059] Although the embodiments of the present application have been described in conjunction with the drawings, those skilled in the art may make various modifications and variations without deviating from the inventive concept and scope of protection of the present application, all such modifications and variations falling within the scope of protection defined by the attached claims.

Claims

[1] Cylindrical battery cap assembly applied to a battery, wherein the battery comprises a battery cell, the battery cell comprises an electrode tab, the electrode tab comprises a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab are arranged on the same side of the battery cell; wherein the cylindrical battery cap assembly comprises: a terminal block; and a current collector (1) comprising a tab connection area and a terminal connection area, wherein the tab connection area is connected to the electrode tab, the terminal connection area is connected to the terminal to establish an electrical connection between the electrode tab and the terminal, wherein the thickness of the terminal connection area is a, the thickness of the tab connection area is b, and the ratio of the thickness b to the thickness a is 0.2 ≤ b / a < 1. [2] Cylindrical battery cap arrangement according to claim 1, wherein the current collector (1) comprises a positive current collector (2) and a negative current collector (3), the positive current collector (2) comprises a positive tab connection area (201) and a positive terminal connection area (202), the negative current collector (3) comprises a negative tab connection area (301) and a negative terminal connection area (302), and the positive terminal connection area (202) or the negative terminal connection area (302) is arranged between the positive tab connection area (201) and the negative tab connection area (301), wherein the ratio of thickness b to thickness a satisfies 0.25 ≤ b / a ≤ 0.

9. [3] Cylindrical battery cap arrangement according to claim 2, wherein the positive current collector (2) is welded to the positive electrode tab and the positive terminal, wherein the negative current collector (3) is welded to the negative electrode tab and the negative terminal, and wherein the positive current collector (2) is made of aluminium and the negative current collector (3) is made of copper. [4] Cylindrical battery cap arrangement according to claim 2 or 3, wherein the positive tab connection area (201) and the negative tab connection area (301) each comprise a sector-shaped structure and the positive tab connection area (201) and the negative tab connection area (301) are arranged around the positive terminal connection area (202) or the negative terminal connection area (302), wherein the sum of a central angle of the positive tab connection area (201) and a central angle of the negative tab connection area (301) is in the range of 150° to 350°, wherein the ratio of the thickness b to the thickness a satisfies 0.28 ≤ b / a ≤ 0.85 and the central angle of the positive tab connection area (201) and the central angle of the negative tab connection area (301) are each in the range of 75° to 175°. [5] Cylindrical battery cap arrangement according to claim 2, 3 or 4, wherein the connection area located between the positive tab connection area (201) and the negative tab connection area (301) is made of copper and the ratio of the thickness of the positive tab connection area (201) to the thickness of the positive connection area (202) is in the range of 0.3 to 0.8 and the ratio of the thickness of the negative tab connection area (301) to the thickness of the negative connection area (302) is also in the range of 0.3 to 0.

8. [6] Cylindrical battery cap arrangement according to claim 2, 3, 4 or 5, wherein the positive current collector (2) and the negative current collector (3) are connected via an insulator (8) and the ratio of the thickness of the negative tab connection area (301) to the thickness of the positive tab connection area (201) is in the range of 0.5 to 1. [7] Cylindrical battery cap arrangement according to claim 6, wherein the positive tab connection area (201) and the negative tab connection area (301) are arranged around the positive terminal connection area (202) or the negative terminal connection area (302) and the ratio of the central angle of the positive tab connection area (201) to the central angle of the negative tab connection area (301) is in the range of 0.5 to 1, wherein the ratio of the thickness b to the thickness a satisfies 0.6 ≤ b / a ≤ 0.

8. [8] Cylindrical battery cap arrangement according to one of claims 1-7, wherein the connection area is provided with a projection (7) and the ratio of thickness b to thickness a is 0.2 ≤ b / a ≤ 0.

8. [9] Cylindrical battery cap assembly according to claim 8, wherein the cylindrical battery cap assembly further comprises a cap body, the terminal clamp has a groove (6) oriented towards the current collector (1), the projection (7) is arranged at least partially within the groove (6), the projection (7) is connected to the terminal clamp, a flange (10) is provided on an edge of the groove (6) on the side close to the current collector (1), the flange (10) is arranged between the current collector (1) and the cap body, there is an overlap area between the flange (10) and the tab connection area m, there is an area of ​​the tab connection area d and the ratio of area m to area d is 0.05 ≤ m / d ≤ 0.

4. [10] Battery comprising the cylindrical battery cap assembly according to one of claims 1-9 and a battery cell, wherein the battery cell comprises an electrode tab, the electrode tab is connected to the tab connection area of ​​the current collector (1) in the cylindrical battery cap assembly, is an orthographic projection area of ​​the electrode tab on the current collector c, is an area of ​​the tab connection area d and satisfies a ratio of area c to area d 0.5 ≤ c / d < 1. [11] Battery according to claim 10, wherein several electrode tabs are provided which are spaced apart from several electrode tabs in the circumferential direction and there is a gap between adjacent electrode tabs in the range of 0.05 mm to 1 mm. [12] Battery according to claim 10 or 11 and with a steel housing, wherein the negative connection area (302) is arranged between the positive tab connection area (201) and the negative tab connection area (301). [13] Battery according to claim 10 or 11 and with an aluminium housing, wherein the positive connection area (202) is arranged between the positive tab connection area (201) and the negative tab connection area (301).

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