Cylindrical battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a cylindrical battery and electric equipment, the cylindrical battery comprises a shell and a collector plate, the shell is provided with an opening and an accommodating cavity, at least part of one end of the shell close to the opening is bent towards the central axis of the accommodating cavity to form a fixed part, and the collector plate is connected with the fixed part. The collector plate and the shell are not connected together on the outer side of the shell through penetration welding, so that the stability after the collector plate and the shell are connected can be effectively improved. Besides, at least part of one end, close to the opening, of the shell is limited to be bent towards the central axis of the accommodating cavity to form the fixing part, so that the occupied space of the fixing part in the accommodating cavity can be reduced, and the energy density of the cylindrical battery can be improved.

Description

Technical Field

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

[0002] In the prior art, the most common cylindrical battery core has electrode tabs protruding from both ends. One end of the two ends of the battery core is the positive electrode, and the other end is the negative electrode. During the assembly process, the positive current collector plate is welded to the positive electrode tab of the battery core and the positive terminal of the housing, and the negative current collector plate is welded to the negative electrode tab of the battery core and the housing. Currently, the welding of the negative current collector plate and the housing is difficult, and generally, penetration welding is used to weld from the outside of the housing to the inside. However, the penetration welding area of the housing is prone to liquid leakage and failure, and during the manufacturing or use process of the battery, the solder joints between the negative current collector plate and the wall surface of the housing are likely to separate due to relative sliding, resulting in the failure of the electrical connection between the two, poor contact, and affecting the performance and safety of the cylindrical battery. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a cylindrical battery and an electrical device using the same, aiming to solve the technical problem of the low connection stability between the existing current collector plate and the housing.

[0004] In a first aspect, the present application provides a cylindrical battery, including a housing and a current collector plate. The housing has an opening and a receiving cavity. At least a part of one end of the housing close to the opening is bent towards the central axis of the receiving cavity to form a fixing part, and the current collector plate is connected to the fixing part.

[0005] Optionally, an installation surface is formed on the surface of the fixing part facing the opening, and the current collector plate is connected to the fixing part through the installation surface.

[0006] Optionally, one end of the housing close to the opening is divided into a housing and a fixing part that are both connected to the housing, and the housing surrounds the fixing part.

[0007] Optionally, the fixing part includes an arc section connected to the housing. The surface of the arc section close to the housing is an arc surface. The arc surface has a tangent line A at the connection between the arc section and the housing, and there is an included angle α between the tangent line A and the height direction of the housing, satisfying the relationship: 15° ≤ α ≤ 45°.

[0008] Optionally, the fixing part further includes a straight section, the straight section is connected to the end of the arc section far from the housing, and extends along the direction perpendicular to the height direction of the housing. The installation surface is formed on the surface of the straight section facing the opening.

[0009] Optionally, the thickness T of the fixing part 1 is 0.2 - 1.5 mm.

[0010] Optionally, the wall thickness of the housing is T 4 , satisfying the relationship: 1.5T 1 ≤ T4 ≤3T 1 。

[0011] Optionally, it further includes an end cap, which is connected to the end of the housing with an opening to seal the opening. The length of the fixing portion in the horizontal direction is L 1 , the horizontal direction is perpendicular to the height direction of the housing, and the fixing portion satisfies at least one of the following conditions:

[0012] (1) L 1 = 2T 2 + T 3 ;

[0013] (2) L 1 = 2T 3 + T 2 ;

[0014] (3) 0.5 mm ≤ L 1 ≤ 3 mm;

[0015] wherein, T 2 is the thickness of the current collector plate, and T 3 is the thickness of the end cap.

[0016] Optionally, in the height direction of the housing, the distance W from the connection between the fixing portion and the housing to the opening is 0.5 - 3 mm.

[0017] Optionally, the number of the fixing portions is one, and the fixing portion extends along the circumferential direction of the housing and is arranged to surround the accommodation cavity for one week.

[0018] Optionally, the number of the fixing portions is at least two, and all the fixing portions are arranged at intervals along the circumferential direction of the housing.

[0019] Optionally, a clamping portion is provided at the edge of the current collector plate, and a clamping groove for clamping with the clamping portion is provided on the fixing portion.

[0020] In a second aspect, the present application provides an electrical device, including the above cylindrical battery.

[0021] The beneficial effects of the cylindrical battery provided by the present utility model are as follows: In the prior art, the housing and the current collector plate are connected by penetration welding on the outer side of the housing. However, in the present application, the current collector plate is connected to the housing through the fixing portion. Since the current collector plate and the housing are not connected together by penetration welding on the outer side of the housing, the stability after the connection between the current collector plate and the housing can be effectively improved. In addition, by defining that at least part of the end of the housing close to the opening is bent towards the central axis of the accommodation cavity to form the fixing portion, the occupied space of the fixing portion in the accommodation cavity can be reduced, which is beneficial to improving the energy density of the cylindrical battery. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of the cylindrical battery provided by the embodiment of the present utility model;

[0024] Figure 2 Is Figure 1 Enlarged view of A in;

[0025] Figure 3 Another structural schematic diagram of the cylindrical battery provided by the embodiment of the present utility model;

[0026] Figure 4 Structural schematic diagram of the housing provided by the embodiment of the present utility model;

[0027] Figure 5 Structural schematic diagram of the current collector provided by the embodiment of the present utility model;

[0028] Figure 6 Another structural schematic diagram of the housing provided by the embodiment of the present utility model;

[0029] Figure 7 Another structural schematic diagram of the current collector provided by the embodiment of the present utility model;

[0030] Figure 8 Another structural schematic diagram of the cylindrical battery provided by the embodiment of the present utility model.

[0031] Among them, the reference numerals in the figure are as follows:

[0032] 100, cylindrical battery; 10, housing; 20, current collector;

[0033] 30, end cap; 40, positive current collector; 50, sealing nail;

[0034] 60, battery cell; 70, positive pole; 11, fixing part;

[0035] 12, outer shell; 13, accommodating cavity; 111, arc section;

[0036] 112, straight section; 113, clamping groove; 21, clamping part. Detailed implementation manners

[0037] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0038] Throughout the specification, reference to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the phrases "in one embodiment" or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0039] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0041] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] Please refer to Figures 1 to 7 , and now the cylindrical battery 100 and the electrical equipment in the embodiments of the present utility model will be described.

[0043] Please refer to Figure 1 and Figure 2, the cylindrical battery 100 provided by this application includes a housing 10 and a current collector plate 20. The housing 10 has an opening and a receiving cavity 13. At least a part of one end of the housing 10 close to the opening is bent towards the central axis of the receiving cavity 13 to form a fixing part 11. The current collector plate 20 is connected to the fixing part 11 and is located between the fixing part 11 and the opening.

[0044] In the prior art, the connection between the housing 10 and the current collector plate 20 is achieved by penetration welding on the outer side of the housing 10. In this application, the current collector plate 20 is connected to the housing 10 through the fixing part 11. Since the current collector plate 20 and the housing 10 are not welded together by penetration welding on the outer side of the housing 10, the stability after the connection between the current collector plate 20 and the housing 10 can be effectively improved. In addition, by defining that at least a part of one end of the housing 10 close to the opening is bent towards the central axis of the receiving cavity 13 to form the fixing part 11, the occupied space of the fixing part 11 in the receiving cavity 13 can be reduced, which is beneficial to improving the energy density of the cylindrical battery 100.

[0045] In another embodiment of this application, an installation surface is formed on the surface of the fixing part 11 facing the opening. The current collector plate 20 is welded to the fixing part 11 through the installation surface. In this way, the connection strength between the current collector plate 20 and the fixing part 11 can be improved, and thus the connection strength between the current collector plate 20 and the housing 10 can be improved.

[0046] Please refer to Figures 1 to 3 , define the axial direction of the cylindrical battery 100 as the up and down direction. For the convenience of description and understanding, hereinafter, an example will be given with the opening of the housing 10 facing downwards and the fixing part 11 located at the lower end of the housing 1.

[0047] In another embodiment of this application, please refer to Figure 3 , the cylindrical battery 100 further includes an electrode core 60 and a positive electrode terminal 70. One end of the housing 10 has an opening, and the opposite end is a closed end. The positive electrode terminal 70 is hermetically connected to the closed end of the housing 10. The electrode core 60 is accommodated in the receiving cavity 13 and is located between the positive electrode terminal 70 and the fixing part 11. There are two current collector plates 20. One of the current collector plates 20 is electrically connected to the fixing part 11 and the negative electrode tab of the electrode core 60. The other current collector plate 20 is located between the positive electrode terminal 70 and the electrode core 60 and is electrically connected to the positive electrode terminal 70 and the positive electrode tab of the electrode core 60. This application does not limit the electrical connection relationship, which can be selected or adjusted according to the actual situation.

[0048] In another embodiment of this application, please refer to Figure 1 and Figure 2, one end of the housing 10 near the opening is divided to form a housing 12 and a fixing portion 11 both connected to the housing 10. The housing 12 is disposed around the fixing portion 11, and the fixing portion 11 is bent toward the central axis of the accommodating cavity 13 for connecting the current collecting plate 20. Specifically, a dividing groove is machined on the lower end surface of the housing 10 by a processing device. The dividing groove surrounds the opening of the housing 10 for one week and extends upward. Thus, the lower end of the housing 10 is divided by the dividing groove to form the housing 12 and the fixing portion 11, wherein the fixing portion 11 is located inside the housing 12. Since the fixing portion 11 and the housing 10 are of an integral structure, that is, the fixing portion 11 is not connected to the housing 10 by connection means such as welding, bonding, and clamping, while having a high connection strength between the fixing portion 11 and the housing 10, the production difficulty is reduced. Also for this reason, there is a higher connection strength between the current collecting plate 20 and the housing 10, which can effectively improve the connection reliability between the current collecting plate 20 and the housing 10. Usually, the wall thickness of the housing 10 is uniform, so the thickness of the fixing portion 11 is less than the wall thickness of the housing 10. However, in other implementable embodiments, the wall thickness of the housing 10 can be non-uniform. For example, the housing 10 is thickened at one end near the opening, and then the dividing groove is machined on the housing 10. Such a setting can improve the mechanical strength of the housing 10, thereby further improving the connection strength between the fixing portion 11 and the housing 10.

[0049] In another embodiment of the present application, please refer to Figure 2 , the fixing portion 11 includes an arc segment 111 connected to the housing 10. The surface of the arc segment 111 near the housing 12 is an arc surface. The arc surface has a tangent line A at the connection between the arc segment 111 and the housing 10. There is an included angle α between the tangent line A and the height direction of the housing 10, satisfying the relational expression: 15° ≤ α ≤ 45°. In this embodiment, the height direction of the housing 10 is parallel to the up and down direction. It can be understood that the arc segment 111 is formed by bending the fixing portion 11. The included angle α can be, for example, 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc. By limiting the included angle α within 15° to 45°, on the one hand, it is avoided that the angle is too small, resulting in difficulty in bending and forming the fixing portion 11. On the other hand, it is avoided that the angle is too large, resulting in fracture of the fixing portion 11 at its connection with the housing 10.

[0050] In another embodiment of the present application, please refer to Figure 2, the fixing part 11 further includes a straight section 112. The straight section 112 is connected to one end of the arc section 111 away from the housing 10 and extends in a direction perpendicular to the height direction of the housing 10. An installation surface is formed on the side of the straight section 112 facing the opening, and the current collector plate 20 is connected to the straight section 112 through the installation surface. By arranging the straight section 112 in this way, on the one hand, in the up and down direction, the space occupied by the fixing part 11 in the accommodating cavity 13 is reduced, which is beneficial to improving the energy density of the cylindrical battery 100. On the other hand, the contact area between the current collector plate 20 and the fixing part 11 can be increased, which is beneficial to improving the connection reliability between the current collector plate 20 and the fixing part 11. In other implementable ways, the installation surface can be formed on the side of the straight section 112 away from the opening, and the specific position of the installation surface can be selected according to actual needs. Forming the installation surface on the side of the straight section 112 close to the opening is most beneficial to the installation of the current collector plate 20.

[0051] In another embodiment of the present application, please refer to Figure 2 , the thickness T of the fixing part 11 1 is 0.2 - 1.5 mm, for example, it can be 0.2 mm, 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.5 mm, etc. Such a setting is based on the following considerations. If the fixing part 11 is too thick, the space in the up and down direction of the cylindrical battery 100 will be wasted, resulting in a decrease in the energy density of the cylindrical battery 100. If the fixing part 11 is too thin, the distance between the fixing part 11 and the negative electrode tab of the battery cell 60 will be too close, and then the current collector plate 20 and the fixing part 11 are likely to be damaged during welding of the current collector plate 20 and the fixing part 11.

[0052] In another embodiment of the present application, please refer to Figure 2 , the wall thickness of the housing 10 is T 4 , satisfying the relational expression: 1.5T 1 ≤T 4 ≤3T 1 . By setting in this way, on the one hand, it is avoided that the housing 10 is too thick, resulting in too large a volume of the housing 10, thereby causing a decrease in the energy density of the cylindrical battery 100. On the other hand, it is avoided that the housing 10 is too thin, resulting in the fixing part 11 being too thin after being divided, thereby causing the current collector plate 20 and the fixing part 11 to be easily welded through the fixing part 11 during welding. In addition, if the housing 10 is too thin, the connection strength between the housing 10 and the fixing part 11 will be reduced, thereby causing the connection reliability between the current collector plate 20 and the housing 10 to be somewhat reduced.

[0053] In another embodiment of the present application, please refer to Figures 1 to 3 , the cylindrical battery 100 further includes an end cap 30. The end cap 30 is connected to the end of the housing 10 having an opening to seal the opening. The length of the fixing part 11 in the horizontal direction is L 1 , the horizontal direction is perpendicular to the height direction of the housing 10, and the fixing part 11 satisfies the following condition: L 1 = 2T2 +T 3 , where T 2 is the thickness of the current collector plate 20, and T 3 is the thickness of the end cap 30. Specifically, the end cap 30 is welded to the lower end of the housing 12.

[0054] In some other embodiments, the fixing portion 11 satisfies the following condition: L 1 = 2T 3 +T 2 .

[0055] In some other embodiments, the fixing portion 11 satisfies the following condition: 0.5 mm ≤ L 1 ≤ 3 mm, and L 1 can be, for example, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, etc.

[0056] It can be seen that the present application uses three conditions to limit the length L 1 of the fixing portion 11 in the horizontal direction. L 1 can satisfy only any one condition, or only any two conditions, or all conditions. Such a limitation is because if L 1 is too short, then the contact area between the fixing portion 11 and the current collector plate 20 is insufficient, resulting in a low welding effect between the two, and it is easy for the fixing portion 11 and the current collector plate 20 to separate. If L 1 is too long, the fixing portion 11 will interfere with the negative electrode tab on the battery cell 60. Then, during the assembly or use of the cylindrical battery 100, the negative electrode tab is easily damaged, resulting in a decrease in the performance of the cylindrical battery 100.

[0057] In another embodiment of the present application, please refer to Figure 2, in the height direction of the shell 10, the distance W from the connection between the fixing part 11 and the shell 10 to the opening is 0.5 to 3 mm, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm. Such a limitation is because if W is too long, it will affect the space utilization of the cylindrical battery 100 in the height direction. It can be understood that the accommodating cavity 13 is divided into upper and lower parts by the fixing part 11, and the battery cell 60 is accommodated in the upper part of the accommodating cavity 13, that is, the battery cell 60 is located above the fixing part 11. When the height of the battery cell 60 is the same, if W is too long, the height of the upper part of the accommodating cavity 13 will become smaller. In order to assemble the battery cell 60 in the accommodating cavity 13, it is necessary to increase the height of the shell 10, which is not conducive to the high energy density requirement of the battery. In addition, if W is too long, it will also affect the strength of the shell 10 of the cylindrical battery 100, causing the shell 10 to be easily deformed. If W is too short, the connection between the end cap 30 and the housing 12 will be affected, because a portion of the end cap 30 is accommodated in the lower portion of the accommodation cavity 13. Once W is too short, the collecting plate 20 will press against the end cap 30, resulting in a gap between the end cap 30 and the housing 12, thereby making it impossible to connect the end cap 30 and the housing 12.

[0058] In another embodiment of the present application, please refer to Figure 4 and Figure 5 The number of the fixing part 11 is one, and the fixing part 11 extends along the circumference of the housing 10 and surrounds the accommodating cavity 13. Such a configuration is conducive to increasing the contact area between the fixing part 11 and the current collecting plate 20, thereby improving the welding effect, and further improving the stability and reliability of the current collecting plate 20 after being connected to the housing 10.

[0059] Of course, in some other embodiments, please refer to Figure 6 , the number of the fixing parts 11 can be at least two, and all the fixing parts 11 are arranged at intervals along the circumference of the shell 10. It can be understood that when the lower end of the shell 10 is processed by a cutting process to form the fixing part 11, the overall thickness of the fixing part 11 may be uneven due to the poor precision of the processing equipment. When the fixing part 11 is processed by a bending process, wrinkles may appear in a certain part of the bent fixing part 11, that is, the upper end face or the lower end face of the fixing part 11 is uneven. The above two defects are likely to cause the current collecting plate 20 to have a low level after being welded to the fixing part 11, so that the battery cell 60 is finally connected to a more inclined current collecting plate 20, which greatly reduces the welding strength between the current collecting plate 20 and the battery cell 60. In the present embodiment, by setting the fixing parts 11 to at least two, and all the fixing parts 11 are arranged at intervals along the circumference of the shell 10, it is helpful to reduce the severity of the consequences caused by the above defects.

[0060] In another embodiment of the present application, please refer to Figure 7, a clamping portion 21 is provided at the edge of the current collector plate 20, and a clamping groove 113 for clamping with the clamping portion 21 is formed in the fixing portion 11. Specifically, in this embodiment, the clamping portion 21 is formed by the convex side surface of the current collector plate 20. The number of the clamping portions 21 can be one or at least two, which is not limited herein. When the number of the clamping portions 21 is at least two, all the clamping portions 21 are arranged at intervals along the circumferential direction of the current collector plate 20. The arrangement of the clamping portion 21 and the clamping groove 113 further improves the reliability after the connection between the current collector plate 20 and the fixing portion 11.

[0061] Of course, in some other embodiments, the clamping portion 21 can be provided on the upper end surface or the lower end surface of the current collector plate 20, as long as the clamping between the clamping portion 21 and the clamping groove 113 can be achieved, which is not limited herein.

[0062] In some embodiments, as described above, a plurality of fixing portions 11 are provided and arranged at intervals along the circumferential direction of the housing 10, and a clamping groove 113 for clamping the clamping portion 21 is formed between two adjacent fixing portions 11. At this time, it can be understood that one end of the clamping groove 113 extends to the connection portion between the fixing portion 11 and the housing 10. Of course, in some other embodiments, one end of the clamping groove 113 may not extend to the connection portion between the fixing portion 11 and the housing 10, as long as the clamping between the clamping portion 21 and the clamping groove 113 can be achieved, which is not limited herein.

[0063] In another embodiment of the present application, please refer to Figure 2 , the current collector plate 20 is connected to the side of the fixing portion 11 facing the opening, that is, the current collector plate 20 is connected to the lower end surface of the fixing portion 11. At this time, the fixing portion 11 can limit the position of the battery cell 60 in the up and down directions.

[0064] In some other embodiments, please refer to Figure 8 , the current collector plate 20 is connected to the side of the fixing portion 11 facing away from the opening, that is, the current collector plate 20 is connected to the upper end surface of the fixing portion 11. After the tabs are flattened, there are no tabs at the outer edge of the end surface of the battery cell 60. At this time, the battery cell 60 abuts against the upper end surface of the current collector plate 20, and the current collector plate 20 can limit the position of the battery cell 60 in the up and down directions.

[0065] Taking the current collector plate 20 as the negative current collector plate and it is connected to the lower end surface of the fixing portion 11 as an example, please refer to Figure 3, this application provides a method for forming a cylindrical battery 100. A battery cell 60 with electrode tabs on both sides is manufactured, that is, the positive electrode tab is located above the battery cell 60, and the negative electrode tab is located below the battery cell 60. The positive electrode tab is welded to the positive current collector plate 40, then the battery cell 60 is placed into the accommodation cavity 13 of the housing 10, and then the positive current collector plate 40 is welded to the positive electrode post 70 on the housing 10. A processing device is used to form a dividing groove at the lower end of the housing 10 to form the outer shell 12 and the fixing part 11, and then the fixing part 11 is bent, and the bent fixing part 11 abuts against the edge of the battery cell 60 to support the battery cell 60. The negative current collector plate is inserted into the housing 10 from below the housing 10, and the negative current collector plate is connected to the negative electrode tab by welding, and then the negative current collector plate is welded to the lower end surface of the fixing part 11 by welding. The end cover 30 is welded to the lower end surface of the outer shell 12. Since the end cover 30 has a through hole penetrating the upper and lower end surfaces of the end cover 30, finally, a sealing nail 50 needs to be welded at the through hole of the end cover 30.

[0066] It can be understood that the above through hole is a liquid injection hole, and the sealing nail 50 is used to seal the liquid injection hole. Since this application does not improve the end cover 30, the structure of the end cover 30 will not be described in detail here.

[0067] This application also provides an electrical device, including the above cylindrical battery 100. The electrical device can include, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

[0068] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A cylindrical battery, characterized in that: include: A shell (10) having an opening and a receiving cavity (13), wherein at least a portion of an end of the shell (10) close to the opening is bent toward a central axis of the receiving cavity (13) to form a fixing portion (11); The current collecting plate (20) is connected to the fixing portion (11).

2. The cylindrical battery according to claim 1, characterized in that: A mounting surface is formed on a side of the fixing portion (11) facing the opening, and the collecting plate (20) is connected to the fixing portion (11) via the mounting surface.

3. The cylindrical battery according to claim 2, characterized in that: One end of the shell (10) close to the opening is divided into an outer shell (12) and the fixing portion (11), both of which are connected to the shell (10); the outer shell (12) is arranged around the fixing portion (11).

4. The cylindrical battery according to claim 3, characterized in that: The fixing portion (11) comprises an arc segment (111) connected to the shell (10); the surface of the arc segment (111) close to the outer shell (12) is an arc surface; the arc surface has a tangent A at the connection between the arc segment (111) and the shell (10); an angle α is formed between the tangent A and the height direction of the shell (10), satisfying the relationship: 15°≤α≤45°.

5. The cylindrical battery according to claim 4, characterized in that: The fixing portion (11) further comprises a straight section (112), the straight section (112) being connected to an end of the arc section (111) away from the housing (10) and extending in a direction perpendicular to a height direction of the housing (10), the mounting surface being formed on a side of the straight section (112) facing the opening.

6. The cylindrical battery according to claim 1, characterized in that: The thickness T1 of the fixing portion (11) is 0.2 to 1.5 mm; And / or, the wall thickness of the shell (10) is T4, satisfying the relationship: 1.5T1≤T4≤3T1.

7. The cylindrical battery according to claim 1, characterized in that: The housing (10) further comprises an end cover (30), the end cover (30) being connected to one end of the housing (10) having the opening so as to seal the opening; the length of the fixing portion (11) in the horizontal direction is L1, the horizontal direction is perpendicular to the height direction of the housing (10), and the fixing portion (11) satisfies at least one of the following conditions: (1) L1 = 2T2 + T3; (2) L1 = 2T3 + T2; (3) 0.5mm≤L1≤3mm; Wherein, T2 is the thickness of the collecting plate (20), and T3 is the thickness of the end cover (30).

8. The cylindrical battery according to any one of claims 1 to 7, characterized in that: In the height direction of the shell (10), the distance W from the connection point between the fixing portion (11) and the shell (10) to the opening is 0.5 to 3 mm.

9. The cylindrical battery according to any one of claims 1 to 7, characterized in that: The number of the fixing portion (11) is one, and the fixing portion (11) extends along the circumference of the shell (10) and is arranged around the accommodating cavity (13); Alternatively, the number of the fixing portions (11) is at least two, and all of the fixing portions (11) are arranged at intervals along the circumference of the housing (10).

10. The cylindrical battery according to any one of claims 1 to 7, characterized in that: The edge of the current collecting plate (20) is provided with a clamping portion (21), and the fixing portion (11) is provided with a clamping groove (113) for clamping with the clamping portion (21).

11. An electrical equipment, characterized in that: A cylindrical battery (100) comprising any one of claims 1 to 10.

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