Cylindrical battery and battery device

By arranging a welding connection between the first current collecting plate and the cover plate in the cylindrical battery and controlling the distance ratio, the problems of insufficient current flow capacity and sealing failure in the prior art are solved, thereby achieving improved battery performance.

CN223321451UActive Publication Date: 2025-09-09CALB GROUP CO LTD
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Patent Information

Application Number
CN202421686341.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-16
Publication Date
2025-09-09
Estimated Expiration
2034-07-16

AI Technical Summary

Technical Problem

In existing cylindrical batteries, the design in which the positive and negative poles are located on the same side has problems such as insufficient current capacity and sealing failure.

Method used

By setting the first collecting plate and the cover plate to be welded, the ratio of the second distance to the first distance is controlled to be 1.2-5, thereby ensuring a strong flow capacity and maintaining a sufficient distance between the welding point and the edge of the cover plate to avoid sealing failure.

Benefits of technology

The overflow capacity when the positive and negative poles are led out on the same side meets the design requirements, avoiding the failure of the seal between the cover and the shell, and ensuring the battery performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of batteries, in particular to a cylindrical battery and a battery device, and the cylindrical battery comprises a shell, a battery cell, a cover plate and a first collector plate, the cover plate seals the opening of the shell and is provided with a pole; the battery core is provided with a roll core body, a first output electrode and a second output electrode; the first collector plate is arranged in the shell, is positioned between the cover plate and the roll core body, is electrically connected with the first output electrode and is in welded connection with the cover plate through a first welding part, so that the first output electrode is connected to the cover plate through the first collector plate, and the welding position of the first welding part and the cover plate is a first welding position; the second output pole is connected to the pole; on the inner side face, facing the battery cell, of the cover plate, the orthographic projection of the first welding position is arranged around the orthographic projection of the pole, the distance between two farthest points on the edge of the orthographic projection of the outer end face, away from the battery cell, of the pole is a first distance, and the distance between two farthest points on the orthographic projection of the first welding position is a second distance; and the ratio of the second distance to the first distance is 1.2-5.
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Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery and a battery device. Background Art

[0002] In existing cylindrical battery designs, some batteries have their positive and negative electrodes located on the same side. One electrode is positioned in the middle of the cover plate, serving as the positive electrode, while the other electrode is welded to the cover plate via a first current collector plate, forming the negative electrode. The weld between the first current collector plate and the cover plate surrounds the positive electrode. However, in existing cylindrical batteries, the weld between the first current collector plate and the cover plate and the relative arrangement of the positive electrode have design flaws, making it difficult for the two electrodes of the cylindrical battery to meet overcurrent requirements or easily causing seal failure. Utility Model Content

[0003] A main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art and provide a cylindrical battery that takes into account both the current flow capacity of the pole and the sealing performance of the battery.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] According to one aspect of the present invention, a cylindrical battery is provided, which includes a shell, a battery cell, a cover plate and a first current collecting disk; the shell has an opening at at least one end; the cover plate is welded to the shell to close the opening, and is provided with a pole; the battery cell is arranged in the shell, and has a winding core body, a first output pole and a second output pole, and the first output pole and the second output pole are both led out from the same end of the winding core body in the axial direction; the first current collecting disk is arranged in the shell and is located between the cover plate and the winding core body, and is electrically connected to the first output pole, and is welded to the cover plate via a first welding portion so that the first output pole The output pole is connected to the cover plate via the first current collecting disk, and the welding point between the first welding portion and the cover plate is the first welding point; wherein, the second output pole is connected to the pole so that the polarity of the cover plate and the pole are different; wherein, the inner side surface of the cover plate facing the battery cell is defined as the reference plane, on the reference plane, the orthographic projection of the first welding point is arranged around the orthographic projection of the pole, the distance between the two farthest points on the edge of the orthographic projection of the outer end face of the pole away from the battery cell is the first distance, the distance between the two farthest points on the orthographic projection of the first welding point is the second distance, and the ratio of the second distance to the first distance is 1.2 to 5.

[0006] From the above technical solution, it can be seen that the advantages and positive effects of the cylindrical battery proposed by the present invention are:

[0007] The first current collecting plate of the cylindrical battery proposed in the present invention is welded to the cover plate via a first welding portion, and the welding point between the first welding portion and the cover plate is the first welding point. The inner side surface of the cover plate facing the battery cell is defined as a reference plane. On the reference plane, the orthographic projection of the first welding point is arranged around the orthographic projection of the pole. The distance between the two points on the edge of the orthographic projection of the pole away from the outer end face of the battery cell that are farthest apart is the first distance. The distance between the two points on the orthographic projection of the first welding point that are farthest apart is the second distance. The ratio of the second distance to the first distance is 1.2 to 5. Through the above structural design, in addition to the pole provided on the cover plate being electrically connected to the second output pole of the battery cell and serving as a pole, the present invention also electrically connects the first current collecting plate to the first lead end of the battery cell and is welded to the cover plate, so that the cover plate serves as another pole of the cylindrical battery, thereby forming a structure in which the positive and negative poles are led out on the same side. On this basis, the present invention adopts the aforementioned ratio design, controlling the ratio of the second distance to the first distance to be above a certain value. This ensures that the first output terminal, connected to the cover plate via the first current collecting disk, has a stronger current flow capacity. This satisfies the design current flow requirements without causing a significant difference in current flow capacity between the two output terminals of the battery cell, thus ensuring battery performance. Furthermore, the present invention controls the ratio of the second distance to the first distance to be below a certain value, ensuring that the weld between the first welded portion and the cover plate maintains a sufficient distance from the edge of the cover plate, thereby preventing seal failure between the cover plate and the housing.

[0008] Another main purpose of the present invention is to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a battery device using the above-mentioned cylindrical battery.

[0009] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] According to another aspect of the present invention, a battery device is provided, which includes the cylindrical battery proposed in the present invention.

[0011] From the above technical solution, it can be seen that the advantages and positive effects of the battery device proposed by the utility model are:

[0012] The battery device proposed in the utility model, by adopting the cylindrical battery proposed in the utility model, can meet the design overcurrent requirements when the positive and negative poles of the cylindrical battery are led out on the same side, ensure battery performance, and at the same time avoid the problem of sealing failure between the cover plate and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The various objects, features, and advantages of the present invention will become more apparent upon consideration of the following detailed description of preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are merely illustrative illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, like reference numerals denote identical or similar components.

[0014] Figure 1 is a schematic diagram of a three-dimensional structure of a cylindrical battery according to an exemplary embodiment;

[0015] Figure 2 and Figure 3 They are Figure 1 Schematic diagram of the three-dimensional exploded structure of a cylindrical battery at two different viewing angles;

[0016] Figure 4 yes Figure 2 Schematic diagram of the three-dimensional structure of some structures in;

[0017] Figure 5 yes Figure 4 A schematic plan view of the cover plate shown;

[0018] Figure 6 FIG1 is a schematic plan view of a cover plate of a cylindrical battery according to another exemplary embodiment;

[0019] Figure 7 FIG. 1 is an enlarged schematic diagram showing a partial structure of a battery device according to an exemplary embodiment.

[0020] The following are the descriptions of the reference numerals:

[0021] 100. Cylindrical battery;

[0022] 110. Housing;

[0023] 120. Battery cells;

[0024] 121. The core body;

[0025] 122. First output pole;

[0026] 123. Second output pole;

[0027] 130. Cover plate;

[0028] 1301. medial surface;

[0029] 1302. Lateral surface;

[0030] 131. Pole;

[0031] 1311. Depression;

[0032] 132. Depression area;

[0033] 140. First collector plate;

[0034] 1401. First plate of face;

[0035] 1402. Connecting part;

[0036] 141. First welding part;

[0037] 1411. Weld;

[0038] 150. Second set of flow discs;

[0039] 1501. Second plate of face;

[0040] 1502. protrusion;

[0041] 200. Busbar;

[0042] 201. Second welding point;

[0043] d1. First distance;

[0044] d2. Second distance. DETAILED DESCRIPTION

[0045] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the description and drawings are essentially for illustrative purposes and are not intended to limit the present invention.

[0046] In the following description of different exemplary embodiments of the present invention, reference is made to the accompanying drawings, which form a part of the present invention and in which different exemplary structures, systems and steps that can implement various aspects of the present invention are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the present invention. Moreover, although the terms "above", "between", "within" and the like may be used in this specification to describe different exemplary features and elements of the present invention, these terms are used herein only for convenience, such as according to the directions of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0047] See Figure 1 , which representatively shows a schematic diagram of the three-dimensional structure of the cylindrical battery 100 proposed in the present invention. In this exemplary embodiment, the cylindrical battery 100 proposed in the present invention is described as being applied to an automotive battery. Those skilled in the art will readily appreciate that in order to apply the relevant designs of the present invention to other types of battery devices, various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below. These changes remain within the scope of the principles of the cylindrical battery 100 proposed in the present invention.

[0048] like Figure 1 As shown, in one embodiment of the present invention, the cylindrical battery 100 provided by the present invention includes a housing 110, a battery cell 120, a cover plate 130 and a first current collecting plate 140. Figures 2 to 5 , Figure 2 : A schematic diagram of a three-dimensional structure of a part of the structure of the cylindrical battery 100 is representatively shown, wherein the three-dimensional structure of the cylindrical battery 100 after the shell 110 is hidden is specifically shown; Figure 4 Representatively shown in Figure 2 A schematic diagram of a three-dimensional structure of a portion of the structure in FIG, which specifically shows the three-dimensional structure of the combined structure of the cover plate 130 and the first collecting plate 140 when viewed from above; Figure 5 A schematic plan view of the cover plate 130 is representatively shown, specifically illustrating the bottom view of the cover plate 130. A dotted line indicates a weld 1411 between the first welding portion 141 and the cover plate 130 on the inner side 1301 of the cover plate 130. The following, combined with the above-mentioned figures, details the structure, connection method, and functional relationship of the main components of the cylindrical battery 100 proposed in the present invention.

[0049] like Figures 1 to 5 As shown, in one embodiment of the present invention, at least one end of the shell 110 has an opening. The cover plate 130 is welded to the shell 110 to close the opening of the shell 110, and the cover plate 130 is provided with a pole 131 (for example, it can be used as the positive pole of the cylindrical battery 100). For example, a through hole is provided on the cover plate 130. After the pole 131 partially passes through the through hole, it can be fixedly connected to the cover plate 130 by riveting the cover plate 130 by flanging. The pole 131 and the cover plate 130 are connected by an insulating member to prevent the cover plate 130 and the pole 131 from short-circuiting. The battery cell 120 is arranged in the shell 110 and has a core body 121, a first output pole 122 and a second output pole 123. The first output pole 122 and the second output pole 123 are both led out from the same end of the core body 121 in the axial direction. The first collecting disc 140 is disposed in the housing 110 and is located between the cover plate 130 and the winding core body 121. One side of the first collecting disc 140 is electrically connected to the first output pole 122, and the other side of the first collecting disc 140 is welded to the cover plate 130 via the first welding portion 141, so that the first output pole 122 is connected to the cover plate 130 via the first collecting disc 140. For the convenience of description and distinction from other welding points, the welding point between the first welding portion 141 and the cover plate 130 is defined as the first welding point in this specification. The specific shape of the first welding point can be referred to in the following. Figure 5The dotted line in the figure indicates weld 1411. The second output pole 123 is connected to the pole 131, so that the polarity of the cover 130 and the pole 131 is different. Based on this, the inner side 1301 of the cover 130 facing the battery cell 120 is defined as a reference plane. On this reference plane, the orthographic projection of the first weld (i.e., weld 1411) is arranged around the orthographic projection of the pole 131. In other words, the first weld is located on the periphery of the pole 131, that is, the first weld is located between the pole 131 and the edge of the cover 130. The distance between the two farthest points on the orthographic projection of the outer end face of the pole 131 away from the battery cell 120 is a first distance d1. The distance between the two farthest points on the orthographic projection of the first weld is a second distance d2. The ratio of the second distance d2 to the first distance d1 (i.e., first distance / second distance) is 1.2 to 5, for example, 1.2, 1.4, 3.5, 4, 5, etc. Through the above-described structural design, in addition to the pole 131 provided on the cover plate 130 being electrically connected to the second output pole 123 of the battery cell 120 to form a single pole, the first current collecting plate 140 is electrically connected to the first lead-out terminal 122 of the battery cell 120 and welded to the cover plate 130, making the cover plate 130 serve as another pole for the cylindrical battery 100, thereby forming a structure in which the positive and negative poles are led out from the same side. Furthermore, the present invention adopts the above-described ratio design, controlling the ratio of the second distance d2 to the first distance d1 to be above a certain value. This ensures that the first output pole 122 connected to the cover plate 130 via the first current collecting plate 140 has a stronger current flow capacity, thereby meeting the design's current flow requirements and preventing a significant difference in current flow capacity between the two output poles of the battery cell 120, thereby ensuring battery performance. Furthermore, the present invention controls the ratio of the second distance d2 to the first distance d1 below a certain value, so that the weld 1411 between the first welding portion 141 and the cover plate 130 maintains a sufficient distance from the edge of the cover plate 130, thereby avoiding the problem of sealing failure between the cover plate 130 and the shell 110.

[0050] like Figure 5 As shown, in one embodiment of the present invention, the ratio of the second distance d2 to the first distance d1 can be further 1.5 to 3, for example, 1.5, 1.6, 2, 2.5, 3, etc. Through the above structural design, the present invention further optimizes the ratio of the second distance d2 to the first distance d1, thereby leaving sufficient space for the welding connection between the busbar 200 and the cover plate 130 when welding the busbar 200 of the cylindrical battery 100, thereby reducing the welding difficulty.

[0051] like Figure 2As shown, in one embodiment of the present invention, the outer side surface 1302 of the cover plate 130 facing away from the battery cell 120 may have a recessed area 132, such as, but not limited to, the annular groove shown in the accompanying drawings. Based on this, the orthographic projection of the first weld on the aforementioned reference plane may at least partially overlap with the orthographic projection of the recessed area 132. Through this structural design, the present invention aligns the first connection point of the first weld 141 with the recessed area 132, thereby reducing the impact of the first weld 141 on the surface flatness of the housing 110 and facilitating the subsequent welding of the busbar 200. Furthermore, the present invention utilizes the recessed area 132 to achieve a thinned design for a portion of the cover plate 130. Consequently, welding the thinned portion to the first weld 141 further facilitates the welding operation.

[0052] like Figures 2 to 4 As shown, in one embodiment of the present invention, the first collecting disk 140 includes a first disk surface 1401 and a connecting portion 1402 . The first disk surface 1401 is electrically connected to the first output pole 122 . The connecting portion 1402 is connected to the first disk surface 1401 . The first welding portion 141 is located on the connecting portion 1402 .

[0053] like Figures 2 to 4 As shown, in one embodiment of the present invention, the cylindrical battery proposed in the present invention may further include a second current collecting disc 150. The second current collecting disc 150 is electrically connected to the second output pole 123 and to the pole 131, so that the second output pole 123 is connected to the pole 131 via the second current collecting disc 150. In addition, the second current collecting disc and the first current collecting disc may be fixedly connected via an injection molded part, thereby achieving a non-electrical assembly relationship between the two current collecting discs and improving the structural integrity.

[0054] like Figures 2 to 4 Based on the structural design of the cylindrical battery including the second current collecting tray 150, in one embodiment of the present invention, a recessed portion 1311 is provided on the surface of the electrode 131 facing the battery cell 120. The second current collecting tray 150 includes a second tray surface 1501 and a protruding portion 1502. The second tray surface 1501 is electrically connected to the second output electrode 123, and the protruding portion 1502 is connected to the second tray surface 1501. The protruding portion 1502 is partially accommodated in the recessed portion 1311 and connected to the electrode 131. Through this structural design, the present invention can utilize the cooperation between the protruding portion 1502 and the recessed portion 1311 to strengthen the connection strength between the second current collecting tray 150 and the electrode 131, while also helping to reduce the difficulty of assembly between the two.

[0055] Based on the structural design of the recessed portion 1311 provided on the pole 131, in one embodiment of the present invention, along the axial direction of the cylindrical battery, the depth of the recessed portion 1311 can account for 5% to 95% of the height of the pole 131, for example, 5%, 10%, 15%, 30%, 60%, 95%, etc. On this basis, the ratio of the second distance d2 to the first distance d1 can be further 1.5 to 5. Through the above structural design, since the recessed portion 1311 is provided on the pole 131, the contact area between the second current collecting plate 150 and the pole 141 (for example, the contact area between the surface of the protrusion 1502 and the inner surface of the recessed portion 1311) is increased, thereby improving the current carrying capacity of the pole 131. Therefore, the lower limit of the ratio of the second distance d2 to the first distance d1 can be appropriately increased.

[0056] like Figure 4 As shown, based on the structural design of the second collecting disc 150 including the second disc surface 1501 and the protrusion 1502, and based on the structural design of the first collecting disc 140 including the first disc surface 1401 and the connecting portion 1402, in one embodiment of the present invention, on the above-mentioned reference plane, the orthographic projection of the connecting portion 1402 is in the shape of a circular ring or an arc, the orthographic projection of the protrusion 1502 is located at the center position of the corresponding circle of the circular ring or the arc, and the orthographic projection of the first disc surface 1401 and the orthographic projection of the second disc surface 1501 are both fan-shaped and located within the outline of the corresponding circle.

[0057] like Figure 4 As shown, in one embodiment of the present invention, on the above-mentioned reference plane, the shapes of the orthographic projection of the first disk surface 1401 and the orthographic projection of the second disk surface 1501 can be the same, and the orthographic projections of the above-mentioned two disk surfaces can be arranged point-symmetrically relative to the center position of the circle.

[0058] It should be noted that when the housing 110 is made of aluminum, the cylindrical battery proposed in the present invention can adopt the aforementioned structural design including the first current collecting disc 140 and the second current collecting disc 150. In other embodiments, the cylindrical battery may also adopt other current collecting disc designs, for example, including only the first current collecting disc 140. In this case, the second output pole 123 of the battery cell 120 can be connected to the pole 131 via other structures or directly connected to the pole 131, without being limited to the aforementioned embodiment.

[0059] like Figure 4 and Figure 5As shown, in one embodiment of the present invention, the first weld portion 141 and the cover plate 130 can be welded in a full circle, that is, the orthographic projection of the first weld (e.g., weld seam 1411) can be circular. Through this structural design, the present invention can further improve the weld strength and current flow capacity between the cover plate 130 and the first current collecting plate 140, while also further simplifying the process complexity during the engineering production process.

[0060] See Figure 6 , Figure 6 FIG. 1 is a schematic plan view of a cover plate 130 of a cylindrical battery 100 that can embody the principles of the present invention.

[0061] Different from Figure 4 and Figure 5 In the embodiment shown, the first welding portion 141 and the cover plate 130 are welded in a full circle. Figure 6 As shown, in another embodiment of the present invention, the first weld portion 141 and the cover plate 130 can also be welded in a partial lap, that is, the orthographic projection of the first weld (e.g., weld seam 1411) is in the shape of a circular arc. Through the above structural design, the present invention utilizes a partial lap welding of the first weld portion 141 between the cover plate 130 and the first current collecting plate 140, which can reduce the heat generated by welding and prevent damage to the separator of the battery cell 120 due to overheating.

[0062] In one embodiment of the present invention, the housing 110 can be made of aluminum. Based on this, the first weld 141 and the cover plate 130 can preferably be welded in a partial lap, so that the orthographic projection of the first weld (e.g., weld seam 1411) is in the shape of an arc. The arc angle of the orthographic projection of the first weld can range from 120° to 180°, for example, 120°, 135°, 150°, 180°, etc. With this structural design, due to the excellent conductivity of the aluminum housing 110, the first current collecting plate 140 and the cover plate 130 can be welded without a full lap to meet the current flow requirements between them. This can further reduce welding heat while meeting the current flow requirements, thus preventing damage to the diaphragm of the battery cell 120. In some embodiments, when the first weld 141 and the cover plate 130 are welded in a partial lap, the arc angle of the orthographic projection of the first weld can also be less than 120°, or greater than 180°, for example, 119°, 181°, etc. Furthermore, when the shell 110 is made of aluminum, the first welding portion 141 and the cover plate 130 may also be welded in a full circle, and the present embodiment is not limited thereto.

[0063] Based on the fact that the shell 110 is made of aluminum and the first welding portion 141 and the cover plate 130 adopt a non-full circle welding design, in one embodiment of the present invention, the first distance d1 can be 5mm to 40mm, for example 5mm, 10mm, 15mm, 30mm, 40mm, etc.

[0064] Based on the fact that the shell 110 is made of aluminum and the first welding portion 141 and the cover plate 130 adopt a non-full circle welding design, in one embodiment of the present invention, the second distance d2 can be 25mm to 60mm, for example 25mm, 30mm, 40mm, 50mm, 60mm, etc.

[0065] Based on the fact that the shell 110 is made of aluminum and the first welding portion 141 and the cover plate 130 adopt a non-full circle welding design, in one embodiment of the present invention, the width of the weld 1411 at the first welding point can be 0.1mm to 2mm, for example 0.1mm, 0.5mm, 1mm, 2mm, 5mm, etc.

[0066] In one embodiment of the present invention, the material of the shell 110 can also be other materials, for example, it can be steel. On this basis, the first welding portion 141 and the cover plate 130 can preferably be full-circle welded so that the orthographic projection of the first welding point (such as the weld 1411) is in the shape of a circle. Through the above-mentioned structural design, since the conductivity of the steel shell 110 is poorer than that of the aluminum shell 110, the present invention adopts a full-circle welding method, thereby being able to further meet the overcurrent requirements. In some embodiments, when the material of the shell 110 is steel, the first welding portion 141 and the cover plate 130 can also be non-full-circle welded, which is not limited to this embodiment.

[0067] Based on the fact that the shell 110 is made of steel and the first welding portion 141 and the cover plate 130 are fully welded, in one embodiment of the present invention, the first distance d1 can be 5 mm to 40 mm, for example, 5 mm, 10 mm, 15 mm, 30 mm, 40 mm, etc.

[0068] Based on the fact that the shell 110 is made of steel and the first welding portion 141 and the cover plate 130 are fully welded, in one embodiment of the present invention, the second distance d2 can be 25 mm to 60 mm, for example, 25 mm, 30 mm, 40 mm, 50 mm, 60 mm, etc.

[0069] Based on the fact that the shell 110 is made of steel and the first welding portion 141 and the cover plate 130 are designed to be fully welded, in one embodiment of the present invention, the width of the weld 1411 at the first welding point can be 0.1mm to 2mm, for example, 0.1mm, 0.5mm, 1mm, 2mm, 5mm, etc.

[0070] like Figure 1 and Figure 5 As shown, in one embodiment of the present invention, the orthographic projection of the pole 131 away from the outer end surface of the battery cell 120 can be a circle, and the first distance d1 is the diameter of the circle, such as the first diameter. In addition, the orthographic projection of the first welding point can be a circumference (or Figure 6 The second distance d2 is the diameter of the circle corresponding to the circumference (or arc), for example, the second diameter. On this basis, the ratio of the second diameter to the first diameter can be 1.2 to 5, and further can be 1.5 to 5.

[0071] It should be noted that the cylindrical batteries shown in the drawings and described in this specification are only a few examples of the many types of cylindrical batteries that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any details or any components of the cylindrical batteries shown in the drawings or described in this specification.

[0072] In summary, the first current collecting plate 140 of the cylindrical battery 100 proposed in the present invention is welded to the cover plate 130 via the first welding portion 141, and the welding point between the first welding portion 141 and the cover plate 130 is the first welding point; the inner side surface 1301 of the cover plate 130 facing the battery cell 120 is defined as the reference plane, on which the orthographic projection of the first welding point is arranged around the orthographic projection of the pole 131, and the distance between the two farthest points on the edge of the orthographic projection of the outer end face of the pole 131 away from the battery cell 120 is the first distance d1, and the distance between the two farthest points on the orthographic projection of the first welding point is the second distance d2, and the ratio of the second distance d2 to the first distance d1 is 1.2 to 5. Through the above-described structural design, in addition to the terminal 131 provided on the cover plate 130 being electrically connected to the second output terminal 123 of the battery cell 120, the present invention also electrically connects the first output terminal 122 of the battery cell 120 and is welded to the cover plate 130, making the cover plate 130 serve as another terminal for the cylindrical battery 100, thereby forming a structure in which the positive and negative terminals are led out from the same side. Furthermore, the present invention utilizes the aforementioned ratio design, controlling the ratio of the second distance d2 to the first distance d1 to a value above a certain value. This ensures that the first output terminal 122 connected to the cover plate 130 via the first current collecting plate 140 has a stronger current flow capacity, thereby meeting the design's current flow requirements and preventing a significant difference in current flow capacity between the two output terminals of the battery cell 120, thereby ensuring battery performance. Furthermore, the present invention controls the ratio of the second distance d2 to the first distance d1 below a certain value, so that the weld 1411 between the first welding portion 141 and the cover plate 130 maintains a sufficient distance from the edge of the cover plate 130, thereby avoiding the problem of sealing failure between the cover plate 130 and the shell 110.

[0073] Based on the above detailed descriptions of several exemplary embodiments of the cylindrical battery 100 proposed in the present invention, an exemplary embodiment of the battery device proposed in the present invention will be described below.

[0074] In one embodiment of the present invention, the battery device provided by the present invention includes the cylindrical battery 100 provided by the present invention and described in detail in the above embodiment.

[0075] In one embodiment of the present invention, the battery device proposed in the present invention includes at least two cylindrical batteries 100 and a busbar 200. One end of the busbar 200 is welded to the pole 131 of one cylindrical battery 100, and the other end is welded to the cover 130 of another cylindrical battery 100. For the convenience of description and distinction from other welds, the weld between the other end of the busbar 200 and the cover 130 of the other cylindrical battery 100 is defined as a second weld 201 in this specification. On this basis, as Figure 6 As shown, the first weld 141 and the cover plate 130 can be partially welded, meaning the orthographic projection of the first weld (e.g., weld 1411) can be in the shape of a circular arc. Furthermore, the second weld 201 is at least partially offset from the first weld along the circumference of the cover plate 130. This structural design further reduces the impact of the first weld 141 on the welding of the busbar 200, ensuring a superior weld quality between the busbar 200 and the cover plate 130.

[0076] It should be noted that the battery devices shown in the drawings and described in this specification are only a few examples of the many types of battery devices that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any details or any components of the battery devices shown in the drawings or described in this specification.

[0077] In summary, the battery device proposed in the present invention, by adopting the cylindrical battery 100 proposed in the present invention, can meet the design overcurrent requirements when the positive and negative poles of the cylindrical battery 100 are led out on the same side, ensure battery performance, and at the same time avoid the problem of sealing failure between the cover plate 130 and the shell 110.

[0078] The above describes and / or illustrates in detail exemplary embodiments of the cylindrical battery and battery device proposed by the present invention. However, the embodiments of the present invention are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described herein. Each component and / or each step of one embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "one", "an" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as labels and are not numerical limitations on their objects.

[0079] Although the cylindrical battery and battery device proposed in the present invention have been described according to different specific embodiments, those skilled in the art will recognize that the present invention can be implemented with modifications within the spirit and scope of the claims.

Claims

1. A cylindrical battery, characterized in that: include: a housing having an opening at at least one end; a cover plate, welded to the shell to close the opening, and provided with a pole; A battery cell is disposed in the housing and comprises a winding core body, a first output pole and a second output pole, wherein the first output pole and the second output pole are both led out from the same end of the winding core body in the axial direction; as well as a first current collecting disk, disposed in the housing and located between the cover plate and the winding core body, electrically connected to the first output electrode, and welded to the cover plate via a first welding portion, so that the first output electrode is connected to the cover plate via the first current collecting disk, and the welding point between the first welding portion and the cover plate is a first welding point; Wherein, the second output pole is connected to the pole, so that the polarity of the cover plate and the pole are different; Among them, the inner side surface of the cover plate facing the battery cell is defined as a reference plane, on which the orthographic projection of the first welding point is arranged around the orthographic projection of the pole, the distance between the two farthest points on the edge of the orthographic projection of the outer end surface of the pole away from the battery cell is a first distance, the distance between the two farthest points on the orthographic projection of the first welding point is a second distance, and the ratio of the second distance to the first distance is 1.2 to 5.

2. The cylindrical battery according to claim 1, characterized in that: The outer side of the cover plate facing away from the battery cell has a recessed area, and on the reference plane, the orthographic projection of the first welding point at least partially overlaps with the orthographic projection of the recessed area.

3. The cylindrical battery according to claim 1, characterized in that: The first current collecting disk includes a first disk surface portion and a connecting portion. The first disk surface portion is electrically connected to the first output pole. The connecting portion is connected to the first disk surface portion. The first welding portion is located on the connecting portion.

4. The cylindrical battery according to claim 1, characterized in that The cylindrical battery further includes a second current collecting disk, which is electrically connected to the second output electrode and connected to the pole, so that the second output electrode is connected to the pole via the second current collecting disk.

5. The cylindrical battery according to claim 4, characterized in that: A recessed portion is provided on the surface of the pole facing the battery cell. The second current collecting disk includes a second disk surface and a protruding portion. The second disk surface is electrically connected to the second output pole. The protruding portion is connected to the second disk surface. The protruding portion is partially accommodated in the recessed portion and is connected to the pole.

6. The cylindrical battery according to claim 5, characterized in that: The depth of the recessed portion accounts for 5% to 95% of the height of the pole; wherein the ratio of the second distance to the first distance is 1.5 to 5.

7. The cylindrical battery according to claim 1, characterized in that: The first welding portion and the cover plate are fully welded, so that the orthographic projection of the first welding portion is a circle; or The first welding portion and the cover plate are partially welded in a circle, so that the orthographic projection of the first welding point is an arc.

8. The cylindrical battery according to claim 1, characterized in that: The shell is made of aluminum; wherein, the first welding portion and the cover plate are partially welded so that the orthographic projection of the first welding point is an arc, and the curvature of the corresponding arc of the orthographic projection of the first welding point is 120° to 180°.

9. The cylindrical battery according to claim 8, characterized in that: The first distance is 5 mm to 40 mm; and / or The second distance is 25 mm to 60 mm; and / or The weld width of the first welding point is 0.1 mm to 2 mm.

10. The cylindrical battery according to claim 1, characterized in that: The shell is made of steel; wherein the first welding portion and the cover plate are fully welded, so that the orthographic projection of the first welding portion is a circle.

11. The cylindrical battery according to claim 10, characterized in that: The first distance is 5 mm to 40 mm; and / or The second distance is 20 mm to 60 mm; and / or The weld width of the first welding point is 0.1 mm to 2 mm.

12. A battery device, characterized in that: The cylindrical battery comprises the cylindrical battery according to any one of claims 1 to 11.

13. The battery device according to claim 12, characterized in that The battery device includes at least two cylindrical batteries and a busbar, one end of the busbar is welded to the pole of one cylindrical battery, and the other end is welded to the cover plate of another cylindrical battery, and the welding point between the other end of the busbar and the cover plate is a second welding point; wherein, the first welding portion and the cover plate are partially welded, so that the orthographic projection of the first welding point is an arc, and in the circumferential direction of the cover plate, the second welding point is at least partially staggered with the first welding point.