Battery end cap assembly and individual battery cells

Abstract

This application discloses a battery end cap assembly and a single battery cell. The battery end cap assembly includes an insulating component, a current collector, a cover plate, and a terminal assembly. The insulating component includes a main body and at least one positioning portion. The main body includes a first surface and a second surface facing away from each other. The first surface includes a terminal fixing area, and at least one positioning portion is disposed on the first surface and adjacent to the terminal fixing area. The current collector includes a disk body and a handle. The handle includes a first connecting section disposed in the terminal fixing area and a second connecting section connected to the disk body. The second connecting section and the first connecting section are both angled together, as are the second connecting section and the disk surface of the disk body. The junction of the first connecting section and the second connecting section contacts or is clearance-fitted with the side of the at least one positioning portion adjacent to the terminal fixing area. The cover plate is disposed on the second surface side of the insulating component. The terminal assembly passes through the cover plate, the terminal fixing area, and the first connecting section, and is fixedly connected to the cover plate, the insulating component, and the first connecting section.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a battery end cap assembly and a single battery cell. Background Technology

[0002] The recyclable nature of secondary batteries has made them a major power source for electrical equipment. As the demand for secondary batteries increases, people are also demanding higher performance from them, especially in terms of battery cycle performance. The energy density of a battery is an important parameter to ensure its cycle performance. Too low energy density per unit volume will result in low battery capacity and poor cycle performance.

[0003] Existing secondary batteries, such as cylindrical lithium-ion batteries, consist of an end cap assembly, an electrode assembly, and a cylindrical casing. In manufacturing cylindrical lithium-ion batteries, the current collector is typically welded to the terminals of the end cap assembly and the tabs of the electrode assembly; then the electrode assembly is placed inside the cylindrical casing; the end cap assembly is then welded to the opening of the cylindrical casing to create a seal. However, the presence of the current collector results in a relatively large gap inside the secondary battery. This gap cannot be fully utilized, which limits further improvements in the energy density of the secondary battery. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a battery end cap assembly and a single battery cell. The battery end cap assembly, by folding the current collector, can save the internal space occupied by the current collector, thereby improving the energy density of the secondary battery.

[0005] This application provides a battery end cap assembly, comprising an insulating member, a current collector, a cover plate, and a terminal post assembly. The insulating member includes a main body and at least one positioning portion. The main body includes a first surface and a second surface facing away from each other. The first surface includes a terminal post fixing area. The at least one positioning portion is disposed on the first surface and adjacent to the terminal post fixing area. The current collector includes a disk body and a handle. The handle includes a first connecting segment disposed in the terminal post fixing area and a second connecting segment connected to the disk body. The second connecting segment and the first connecting segment, as well as the second connecting segment and the disk surface of the disk body, are arranged at an angle. The junction of the first connecting segment and the second connecting segment contacts or is clearance-fitted with the side of the at least one positioning portion adjacent to the terminal post fixing area. The cover plate is disposed on the second surface side of the insulating member. The terminal post assembly passes through the cover plate, the terminal post fixing area, and the first connecting segment, and is fixedly connected to the cover plate, the insulating member, and the first connecting segment.

[0006] A second aspect of this application provides a single-cell battery, the single-cell battery including the aforementioned battery end cap assembly, electrode assembly and housing, the electrode assembly being disposed on the side of the disc body away from the second connecting section, the housing having an opening, the battery end cap assembly covering the opening and cooperating with the housing to form a cavity, the electrode assembly being accommodated in the cavity.

[0007] The battery end cap assembly and single battery provided in this application, by setting the connecting section, transition section and disk body of the current collector at an angle, allow the current collector to be folded, saving internal space in the battery and thus improving the energy density of the secondary battery. Furthermore, the end of the second connecting section near the first connecting section contacts or is clearance-fitted with at least one positioning part; that is, the bending position between the second connecting section and the first connecting section is adjacent to or abuts against at least one positioning part. It can be seen that the positioning part can achieve consistency in the bending position. Attached Figure Description

[0008] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the battery end cap assembly provided in an embodiment of this application.

[0010] Figure 2 for Figure 1 The diagram shows an exploded view of the battery end cap assembly.

[0011] Figure 3 for Figure 1 The diagram shows the structure of the insulating component.

[0012] Figure 4 for Figure 1 The diagram shows the side structure of the collector plate.

[0013] Figure 5 This is a schematic diagram of the structure of the initial collector disk provided in the embodiment of this application.

[0014] Figure 6 This is a schematic diagram of the battery end cap assembly after the initial current collector is bent for the first time, as provided in the embodiments of this application.

[0015] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the battery end cap assembly.

[0016] Figure 8 for Figure 7An enlarged diagram of A in the diagram.

[0017] Figure 9 This is a structural block diagram of a single battery provided in an embodiment of this application.

[0018] Figure 10 This is a structural block diagram of a battery pack provided in an embodiment of this application.

[0019] Figure 11 This is a structural block diagram of the electrical equipment provided in the embodiments of this application.

[0020] Explanation of reference numerals in the attached figures:

[0021] 100-Battery end cap assembly; 10-Insulator; 20-Current collector; 11-Main body; 111-First surface; 12-Positioning part; 111a-Terminal fixing area; 21-Disc body; 22-Handle body; 221-First connecting section; 222-Second connecting section; 30-Cover plate; 40-Terminal assembly; 31-First through hole; 41-Terminal; 42-Terminal fixing member; 43-Insulating pad; 44-Insulating washer; 411-First stop flange; 412-Second stop flange; 60-Initial current collector; 61-Initial handle body; 611-First section; 612-Second section; 6111-Second through hole; 2211-First end of first connecting section; 2212-First connection 2221-Second connecting section first end; 2222-Second connecting section second end; 211-Disc body first end; 212-Disc body second end; 121-First end; 122-Second end; 121a-First chamfer; 610-Connection between the second section and the first section; 13-Support part; 14-Air passage; 15-Abutting part; 151-First abutting section; 152-Second abutting section; 2213-First mating edge; 2214-Second mating edge; 32-Explosion-proof valve; 321-Valve plate; 322-Valve hole; 323-Protective component; 33-Cover plate body; 200-Single battery; 150-Electrode assembly; 300-Battery pack; 400-Electrical equipment. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, the terms "first," "second," "third," etc., are used to distinguish different objects, not to describe a specific order. In addition, the terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] In the description of this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] The illustrations provided in this application are only schematic representations of the basic concept of this application. The illustrations only show components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0026] Please see Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of the battery end cap assembly 100 provided in an embodiment of this application. Figure 2 for Figure 1 The exploded view of the battery end cap assembly 100 shown is shown below. Figure 3 for Figure 1 The schematic diagram of the insulating component 10 shown is as follows. Figure 4 for Figure 1 The diagram shows a side view of the collector plate 20. (As shown) Figures 1 to 4As shown, the battery end cap assembly 100 includes an insulating component 10, a current collector 20, a cover plate 30, and a terminal post assembly 40. The insulating component 10 includes a main body 11 and at least one positioning part 12. The main body 11 includes a first surface 111 and a second surface facing away from each other. The first surface 111 includes a terminal post fixing area 111a. The at least one positioning part 12 is disposed on the first surface 111 and adjacent to the terminal post fixing area 111a. The current collector 20 includes a disk body 21 and a handle 22. The handle 22 includes a first connecting section 221 disposed on the terminal post fixing area 111a and a second connecting section 222 connected to the disk body 21. The second connecting section 222 and the first connecting section 221 are arranged at an angle, as are the second connecting section 222 and the disk surface of the disk body 21. The joint between the first connecting section 221 and the second connecting section 222 is in contact or clearance fit with the side of the at least one positioning part 12 adjacent to the terminal post fixing area 111a. The cover plate 30 is disposed on the second surface side of the insulating member 10. The pole assembly 40 passes through the cover plate 30, the pole fixing area 111a and the first connecting section 221, and is fixedly connected to the cover plate 30, the insulating member 10 and the first connecting section 221.

[0027] The battery end cap assembly 100 provided in this application embodiment, by setting the first connecting segment 221, the second connecting segment 222, and the disk body 21 of the current collector 20 at an angle, allows the current collector 20 to be folded, saving internal battery space and thereby increasing the energy density of the secondary battery. Furthermore, the end of the second connecting segment 222 near the first connecting segment 221 contacts or gap-fits the at least one positioning part 12, meaning the bending position between the second connecting segment 222 and the first connecting segment 221 is adjacent to or abuts against at least one positioning part 12. It can be seen that the positioning part 12 can achieve consistency in the bending position.

[0028] In some embodiments, the distance between the junction of the first connecting segment 221 and the second connecting segment 222 and the side of the at least one positioning part 12 adjacent to the pole fixing area 111a is greater than or equal to 0 and less than or equal to 2 mm, that is, the junction of the first connecting segment 221 and the second connecting segment 222 and the positioning part 12 can completely abut against each other or have a small gap.

[0029] The collector plate 20 is in a folded state, the second connecting section 222 is located on the side of the first connecting section 221 away from the pole fixing area 111a, and the plate body 21 is located on the side of the second connecting section 222 away from the first connecting section 221.

[0030] In some embodiments, the first included angle between the second connecting segment 222 and the first connecting segment 221 and the second included angle between the second connecting segment 222 and the disk surface of the disk body 21 are both greater than 0° and less than 90°, such that the orthographic projections of the first connecting segment 221, the second connecting segment 222 and the disk body 21 along the direction perpendicular to the main body overlap at least partially, thereby reducing the space occupied by the current collector 20 and thus improving the energy density of the secondary battery.

[0031] In some embodiments, the first included angle and the second included angle may both be greater than 0° and less than or equal to 45°, thereby increasing the area of ​​the overlapping orthographic projections of the first connecting segment 221, the second connecting segment 222 and the disk body 21 in the direction perpendicular to the main body 11, thereby reducing the space occupied by the first connecting segment 221, the second connecting segment 222 and the disk body 21 in the direction parallel to the main body 11.

[0032] The first and second included angles can be set to smaller values ​​within a range greater than 0° and less than or equal to 45° to minimize the space occupied by the collector plate 20 in the direction perpendicular to the main body 11. In some embodiments, the values ​​of the first and second included angles can be close to 0°.

[0033] The collector plate 20 can be integrally formed, or the handle 22 and the plate 21 can be fixedly connected by welding, screwing, riveting or other methods.

[0034] In some embodiments, such as Figure 2 As shown, the electrode assembly 40 includes an electrode 41, an electrode fixing member 42, an insulating pad 43, and an insulating washer 44. The insulating pad 43 is located on the side of the cover plate 30 away from the insulating member 10 and partially passes through the first through hole 31 of the cover plate 30. The insulating pad 43 has a groove, and the electrode fixing member 42 is located in the groove. The insulating washer 44 is located on the side of the cover plate 30 close to the insulating member 10 and partially passes through the first through hole 31 of the cover plate 30. The electrode 41 passes through the electrode fixing member 42, the insulating pad 43, and the insulating washer 44. The portions of the insulating pad 43 and the insulating washer 44 that pass through the first through hole 31 separate the portion of the electrode 41 located in the first through hole 31 from the cover plate 30. The pole post 41 is provided with a first stop flange 411 and a second stop flange 412. The first stop flange 411 abuts against the first connecting section 221, and the second stop flange 412 abuts against the pole post fixing member 42, so that the pole post 41 is fixed together with the cover plate 30 and the collector plate 20.

[0035] The insulating component 10 is used for insulation between the cover plate 30 and the current collector 20. Since the terminal 41 is electrically connected to the current collector 20, and the terminal fixing component 42 is electrically connected to the terminal 41, the insulating pad 43 can prevent leakage and short circuit of the cover plate 30 caused by direct contact between the cover plate 30 and the terminal fixing component 42. The insulating gasket 44 can prevent short circuit caused by direct contact between the cover plate 30 and the terminal 41, as well as prevent leakage of electrolyte and gas from the battery due to poor sealing, thereby increasing the safety of the secondary battery.

[0036] Please refer to the following: Figure 4 and Figure 5 , Figure 5 This is a schematic diagram of the structure of the initial collector disk 60 provided in an embodiment of this application. In some embodiments, the collector disk 20 is formed by folding the initial collector disk 60. Figure 5 As shown, the initial collector plate 60 includes the plate body 21 and the initial handle 61. The plate body 21 and the initial handle 61 are on the same plane, that is, the plate body 21 and the initial handle 61 extend in the same direction. The initial handle 61 includes a first segment 611 and a second segment 612. The first segment 611 is attached to the pole fixing area 111a to form the first connecting segment 221. The end of the second segment 612 near the first segment 611 is close to or abuts against the side of the positioning part 12 near the pole fixing area 111a, and bends towards the first connecting segment 221 at a bending angle of approximately 90°, forming a structure as shown. Figure 6 As shown, Figure 6 This is a schematic diagram of the battery end cap assembly 100 after the initial current collector 60 is bent for the first time. The second segment 612 is then bent towards the first connecting segment 221, i.e., a second bending operation is performed on the initial current collector 60, so that the angle between the second segment 612 and the first connecting segment 221 is less than 90°, thus forming the second connecting segment 222. Then, the disk body 21 is bent towards the second connecting segment 222, i.e., a third bending operation is performed on the initial current collector 60, so that the angle between the disk body 21 and the second connecting segment 222 is less than 90°, thus forming... Figure 4 The structure of the collector plate 20 shown and Figure 1 The structure of the battery end cap assembly 100 shown is as follows: Figure 1 This is a schematic diagram of the structure of the battery end cap assembly 100 after the initial collector disk 60 is bent for the third time.

[0037] During the bending process of the initial collector plate 60, the first segment 611 is first placed in the pole fixing area 111a, and the second segment 612, which is on the same plane as the first segment 611, is located on the side of the positioning part 12 away from the main body 11. Then, the first segment 611 and the pole assembly 40 are riveted and fixed. During the riveting and fixing process, the pole 41 is inserted into the second through hole 6111 of the first segment 611 in a direction perpendicular to the main body 11. The first stop flange 411 of the pole 41 is adjacent to the second through hole 6111. The first segment 611 is riveted to the pole post assembly 40 by the field abutment. When the pole post 41 is inserted into the second through hole 6111 and fixed to the first segment 611, the initial handle 61 is subjected to a force in a direction perpendicular to the main body 11 and from the first segment 611 to the main body 11. This causes the end of the second segment 612 near the first segment 611 to press against the positioning part 12. The end of the second segment 612 near the first segment 611 is subjected to a force from the positioning part 12 toward the first segment 611 (e.g., ...). Figure 6 The force (in the Y direction as shown) causes the segment 611 to bend towards the first segment 611 and abut against the side of the positioning part 12 near the pole post fixing area 111a, resulting in the following... Figure 6 The structure shown allows for the first bending of the initial collector plate 60 simultaneously with the riveting and fixing of the pole assembly 40. At this point, the angle between the first segment 611 and the second segment 612 is approximately 90°. Then, the second segment 612 is bent towards the first segment 611, reducing the angle between them to less than 90°, thus performing the second bending of the initial collector plate 60. Finally, the plate body 21 is bent towards the side of the second segment 612 furthest from the first segment 611, thus performing the third bending of the initial collector plate 60. At this point, the bending process of the initial collector plate 60 is complete, resulting in the structure shown. Figure 1 The structure shown.

[0038] By setting the positioning part 12, the initial collector plate 60 can be bent for the first time while the first segment 611 and the pole post assembly 40 are being riveted and fixed. This means that the bending process of the initial collector plate 60 only requires two bending operations, avoiding the need for a third bending operation after the riveting and fixing process. This simplifies the bending process and makes the bending operation simpler and less strenuous, thereby improving production efficiency.

[0039] The initial collector plate 60 can be integrally formed, or the initial handle 61 and the plate body 21 can be fixedly connected by welding, screwing, riveting or other methods.

[0040] In some embodiments, the first connecting segment 221 includes a first connecting segment first end 2211 and a first connecting segment second end 2212, the second connecting segment 222 includes a second connecting segment first end 2221 and a second connecting segment second end 2222, the disc body 21 includes a disc body first end 211 and a disc body second end 212, the first connecting segment second end 2212 is connected to the second connecting segment first end 2221, the second connecting segment second end 2222 is connected to the disc body first end 211, the first connecting segment first end 2211, the second connecting segment second end 2222 and the disc body first end 211 are located on the first side of the central region of the pole post fixing area 111a, the first connecting segment second end 2212, the second connecting segment first end 2221 and the disc body second end 212 are located on the second side of the central region of the pole post fixing area 111a, and the second side is opposite to the first side.

[0041] Specifically, by positioning the first end 2211 of the first connecting segment, the second end 2222 of the second connecting segment, and the first end 211 of the disk body on the first side of the central region of the pole fixing area 111a, and the second end 2212 of the first connecting segment, the first end 2221 of the second connecting segment, and the second end 212 of the disk body on the second side of the central region of the pole fixing area 111a, the centers of the orthographic projections of the first connecting segment 221, the second connecting segment 222, and the disk body 21 on the main body 11 are approximately coincident, thereby minimizing the space occupied by the first connecting segment 221, the second connecting segment 222, and the disk body 21 when the collector plate 20 is in a folded state. The orthographic projections of the first connecting segment 221, the second connecting segment 222, and the disk body 21 on the main body 11 are respectively the projections of the first connecting segment 221, the second connecting segment 222, and the disk body 21 on the main body 11 along a direction perpendicular to the main body 11.

[0042] The electrode fixing area 111a can be the central area of ​​the first surface 111, so that the center of the orthographic projection of the first connecting segment 221, the second connecting segment 222 and the disk 21 on the main body 11 is approximately coincident with the center of the main body 11. This can improve the coaxiality of the current collector 20 with the insulating member 10 and the cover plate 30, and thus improve the coaxiality of the electrode assembly with the insulating member 10 and the cover plate 30. This can better prevent the electrode assembly from being misaligned when it is inserted into the casing, thereby avoiding the electrode assembly from contacting the inner wall of the battery casing due to misalignment, which would affect the battery's service life.

[0043] In other embodiments, the pole fixing area 111a may be other areas of the first surface 111, and can be set according to actual needs.

[0044] Please see Figure 7 and Figure 8 , Figure 7 for Figure 6 The diagram shows a cross-sectional structure of the battery end cap assembly 100. Figure 8 for Figure 7 A magnified view of A. In some embodiments, such as Figure 7 and Figure 8 As shown, the positioning part 12 includes a first end 121 and a second end 122 opposite to each other. The first end 121 is connected to the main body 11, and the second end 122 is away from the main body 11. The side of the first end 121 near the pole fixing area 111a is provided with a first chamfer 121a, and is transitionally connected to the main body 11 through the first chamfer 121a. The arc surface of the first chamfer 121a is recessed toward the connection between the positioning part 12 and the main body 11.

[0045] Specifically, by setting the side of the first end 121 near the pole fixing area 111a to be connected to the main body 11 through an arc transition, during the first bending of the initial collector plate 60, when the second segment 612 is squeezed by the positioning part 12 and bends towards the first segment 611, the presence of the first chamfer 121a will cause the second segment 612 and the first segment 611 to be connected through an arc transition, that is, the connection 610 between the second segment 612 and the first segment 611 is arc-shaped. This can avoid the stress concentration at the connection 610 between the second segment 612 and the first segment 611 on the side of the first end 121 near the pole fixing area 111a. Therefore, the stress at the connection 610 between the second segment 612 and the first segment 611 is small and it is not easy to break.

[0046] In some embodiments, the distance from the end of the first chamfer 121a away from the main body 11 to the main body 11 is 1 / 6 to 1 / 2 of the height of the positioning part 12. This not only effectively prevents the connection between the first connecting segment 221 and the second connecting segment 222 from breaking due to excessive bending, but also avoids the second connecting segment 222 from being too far apart from the first connecting segment 221 after a second bend due to the excessive arc surface at the connection between the second connecting segment 222 and the first connecting segment 221. This also avoids the current collector 20 occupying a large space in the direction perpendicular to the main body 11, thereby avoiding a negative impact on the energy density of the battery.

[0047] Specifically, when the height of the first chamfer 121a is less than 1 / 6 of the height of the positioning part 12, the arc surface of the first chamfer 121a is smaller, resulting in a smaller arc surface at the connection between the second connecting segment 222 and the first connecting segment 221. The stress at this connection is still relatively high, making it prone to breakage. When the height of the first chamfer 121a is greater than 1 / 2 of the height of the positioning part 12, the arc surface of the first chamfer 121a is larger, resulting in a larger arc surface at the connection between the second connecting segment 222 and the first connecting segment 221. This leads to a larger gap between the second connecting segment 222 and the first connecting segment 221, which is not conducive to reducing the space occupied by the current collector 20 and will negatively impact the energy density of the secondary battery.

[0048] The height of the positioning part 12 is a dimension along a direction perpendicular to the main body part 11.

[0049] In some embodiments, the height of the positioning part 12 is greater than the thickness of the first connecting segment 221, so that the positioning part 12 can exert a squeezing effect on the second segment 612, causing the second segment 612 to bend toward the first segment 611.

[0050] The height of the positioning part 12 is the dimension along the direction perpendicular to the main body part 11, and the thickness of the first connecting section 221 is the dimension along the direction perpendicular to the main body part 11.

[0051] In some embodiments, the height of the positioning part 12 is 2 to 4 times the thickness of the first connecting segment 221, so that the positioning part 12 can effectively squeeze the second segment 612, and also avoid the positioning part 12 being too high and occupying space.

[0052] In some embodiments, the height of the positioning part 12 is greater than or equal to 3 mm, so that the positioning part 12 can effectively compress the second segment 612, causing the second segment 612 to bend towards the first segment 611. When the height of the positioning part 12 is less than 3 mm, the positioning part 12 is relatively short, and the compressive effect on the second segment 612 is limited, making it more difficult for the second segment 612 to bend towards the first segment 611, which is not conducive to performing the first bending of the collector plate 20 while riveting and fixing the pole post assembly 40.

[0053] In some embodiments, the width direction of the second connecting segment 222 is parallel to the extension direction of the positioning portion 12, and the width direction of the second connecting segment 222 is perpendicular to the length direction of the second connecting segment 222 and parallel to the main body portion 11.

[0054] In some embodiments, the at least one positioning part 12 includes one, wherein the perpendicular line of the second connecting segment 222 perpendicular to the width direction of the second connecting segment 222 coincides with the perpendicular line of the positioning part 12 perpendicular to the extension direction of the positioning part 12, such that when the positioning part 12 squeezes the second segment 612, the portion of the second segment 612 near the positioning part 12 is subjected to a more uniform force, which is beneficial for the portion of the second segment 612 near the positioning part 12 to bend toward the first segment 611.

[0055] When there is only one positioning part 12, the length of the positioning part 12 is greater than or equal to half the width of the second connecting segment 222, that is, the length of the positioning part 12 is greater than or equal to half the width of the second segment 612, so that when the second segment 612 is bent, the compression area of ​​the single positioning part 12 on the second segment 612 is larger, so that the second segment 612 can bend smoothly towards the first segment 611 under the compression action of the single positioning part 12.

[0056] The length of the positioning part 12 is the dimension along the extending direction of the positioning part 12.

[0057] In other embodiments, the at least one positioning part 12 includes a plurality of positioning parts 12, the plurality of positioning parts 12 extending in the same direction and the arrangement direction of the plurality of positioning parts 12 being parallel to the extension direction of the positioning parts 12, that is, the plurality of positioning parts 12 are arranged in a straight line, and the plurality of positioning parts 12 are symmetrically arranged about the perpendicular line of the second connecting segment 222 perpendicular to the width direction of the second connecting segment 222 as the axis of symmetry, so that when the plurality of positioning parts 12 squeeze the second segment 612, the portion of the second segment 612 near the positioning part 12 is subjected to a more uniform force, which is beneficial for the portion of the second segment 612 near the positioning part 12 to bend toward the first segment 611.

[0058] In some embodiments, the at least one positioning part 12 includes two parts, the length of each positioning part 12 is greater than or equal to 1 / 4 of the width of the second connecting segment 222, and the sum of the lengths of the two positioning parts 12 is greater than or equal to half the width of the second connecting segment 222, so that when the second segment 612 is bent, the compression area of ​​the two positioning parts 12 on the second segment 612 is large, so that the second segment 612 can bend smoothly towards the first segment 611 under the compression action of the positioning part 12.

[0059] When there are multiple positioning parts 12, the multiple positioning parts 12 are distributed at intervals along the width direction of the second connecting segment 222. The distance between two adjacent positioning parts 12 is greater than or equal to 2.5 mm and less than or equal to 5 mm, so that when the multiple positioning parts 12 arranged along the width direction of the second connecting segment 222 compress the second segment 612, the contact area is large, which can provide a large force to the second segment 612. In addition, the gas generated by the electrode assembly can be smoothly discharged through the gap between two adjacent positioning parts 12.

[0060] Specifically, when the distance between two adjacent positioning parts 12 is less than 2.5 mm, the small distance between the positioning parts 12 is not conducive to the gas generated by the electrode assembly being discharged from the gap between the positioning parts 12, and is also not conducive to processing and manufacturing. When the distance between two adjacent positioning parts 12 is greater than 5 mm, the large distance between the positioning parts 12 results in a larger area of ​​the portion of the second segment 612 corresponding to the gap between the two adjacent positioning parts 12, that is, a larger area of ​​the second segment 612 not in contact with the positioning part 12. When the second segment 612 is bent, the force on the second segment 612 will be smaller, so the second segment 612 is not easy to bend toward the first segment 611. Furthermore, if the gap between two adjacent positioning parts 12 is too large, it may cause the second segment 612 to deform, for example, the portion of the second segment 612 corresponding to the gap may extend into the gap or form wrinkles.

[0061] In some embodiments, the second end portion 122 of the positioning portion 12 has a second chamfer on the side near the pole post fixing area 111a, and the arc surface of the second chamfer protrudes in a direction away from the positioning portion 12, so that when the positioning portion 12 presses the second segment 612, the second segment 612 can be prevented from being scratched and damaged by the sharp corner of the second end portion 122 near the pole post fixing area 111a.

[0062] In some embodiments, such as Figure 2 and Figure 3 As shown, the insulating member 10 further includes at least one support portion 13, which is disposed on the side of the main body 11 near the current collector 20, i.e., on the first surface 111. The at least one support portion 13 surrounds at least a portion of the electrode fixing area 111a. The side of the disk body 21 near the second connecting section 222 contacts or gap-fits the end of the support portion 13 away from the main body 11, so that the support portion 13 provides support for the disk body 21, and in turn provides support for the electrode assembly disposed on the side of the current collector 20 away from the support portion 13.

[0063] The height of the support part 13 is greater than the height of the positioning part 12, so that there is a gap between the disc body 21 and the positioning part 12, which prevents the disc body 21 from being pressed against the positioning part 12 and becoming uneven or even damaged. The flat disc body 21 is conducive to the installation of the electrode assembly.

[0064] Wherein, the distance between the side of the disc 21 near the second connecting section 222 and the end of the support 13 away from the main body 11 is greater than or equal to 0 and less than or equal to 1 mm, that is, the disc 21 and the support 13 can be completely abutted or have a small gap.

[0065] The height of the support portion 13 is the dimension of the support portion 13 in a direction perpendicular to the main body portion 11.

[0066] In some embodiments, such as Figure 2 and Figure 3 As shown, the insulating member 10 further includes a venting channel 14, which penetrates the main body 11 and is located on the side of the at least one positioning part 12 away from the electrode post fixing area 111a. The at least one positioning part 12 and the at least one support part 13 are spaced apart, so that the gas generated by the electrode assembly can flow from the gap between the positioning part 12 and the support part 13 to the venting channel 14 (e.g., Figure 3 (As indicated by the arrow in the image), and discharged from the air passage 14.

[0067] Among them, such as Figure 2 and Figure 3 As shown, the air passage 14 can be hollowed out to facilitate gas discharge and have a certain structural strength.

[0068] In some embodiments, such as Figure 2 and Figure 3 As shown, the insulating member 10 further includes an abutting portion 15, which is disposed on the first surface 111 and near the pole fixing area 111a. The abutting portion 15 and the at least one positioning portion 12 are arranged around the pole fixing area 111a. The end of the first connecting segment 221 away from the positioning portion 12 abuts against the side of the abutting portion 15 near the pole fixing area 111a.

[0069] Specifically, by providing the abutment portion 15, when the first segment 611 is attached to the pole post fixing area 111a, the abutment portion 15 can position the first segment 611, ensuring that the first segment 611 is accurately positioned in the pole post fixing area 111a. Furthermore, when the first segment 611 is riveted and fixed to the pole post assembly 40, and the second segment 612 is bent toward the first segment 611, the abutment portion 15 can limit the movement of the first segment 611 in a direction away from the positioning portion 12. This prevents the second segment 612 from moving away from the positioning portion 12 along with the first segment 611, thereby facilitating the contact between the second segment 612 and the positioning portion 12, and further facilitating the bending of the second segment 612 toward the first segment 611.

[0070] In some embodiments, such as Figure 2 , Figure 3 and Figure 6 As shown, the abutting portion 15 includes a first abutting section 151 and a second abutting section 152. The first abutting section 151 and the second abutting section 152 are arranged at an angle. The first abutting section 151 and the positioning portion 12 are located on opposite sides of the pole fixing area 111a. The second abutting section 152 is located between the first abutting section 151 and the positioning portion 12. The first connecting section 221 includes a first mating edge 2213 and a second mating edge 2214. The first mating edge 2213 is away from the positioning portion 12, and the second mating edge 2214 is adjacent to the first mating edge 2213. The first abutting section 151 abuts against the first mating edge 2213, and the second abutting section 152 abuts against the second mating edge 2214. The angle between the first abutting section 151 and the second abutting section 152 can be greater than or equal to 90° and less than 180°.

[0071] Specifically, by setting the first abutting section 151 to abut against the first mating edge 2213, the first segment 611 will not move away from the positioning part 12, which is beneficial for the positioning part 12 to squeeze the second segment 612. By setting the second abutting section 152 to abut against the second mating edge 2214, the second segment 612 will not move in a direction parallel to the extension direction of the positioning part 12, which is beneficial for the positioning part 12 to squeeze the second segment 612 and to confine the first segment 611 to the pole post fixing area 111a. Furthermore, both the first abutting section 151 and the second abutting section 152 can position the first segment 611, so that the first segment 611 can accurately fit with the pole post fixing area 111a to form the first connecting segment 221.

[0072] In some embodiments, the cover plate 30 includes an explosion-proof valve 32, the orthographic projection of the explosion-proof valve 32 on the main body 11 at least partially overlaps with the air passage 14, and the explosion-proof valve 32 is used to discharge the gas in the air passage 14 to the outside of the cover plate 30 when the pressure of the gas in the air passage 14 reaches a preset pressure.

[0073] The explosion-proof valve 32 includes a valve plate 321 and a valve hole 322. The valve hole 322 penetrates the cover plate 30. The valve plate 321 covers the valve hole 322 and has a preset scratch. The preset scratch can reduce the structural strength of the valve plate 321. When the gas pressure inside the battery reaches the preset pressure, the gas reaches the explosion-proof valve 32 through the gas passage 14. The valve plate 321 with the preset scratch will break when impacted by the gas. The gas can flow from this position to the valve hole 322 and be discharged to the outside of the battery through the valve hole 322, thereby realizing gas exhaust and pressure relief and avoiding safety risks to the battery.

[0074] Among them, such as Figure 2 and Figure 3 As shown, the cover plate 30 also includes a cover plate body 33, the valve hole 322 penetrates the cover plate body 33, the valve plate 321 is connected to the cover plate body 33 and covers the valve hole 322 to prevent external impurities from entering the battery through the valve hole 322.

[0075] The valve plate 321 can be disposed on the side of the cover plate body 33 near the collector plate 20. The valve plate 321 can be welded to the cover plate body 33, for example, by laser welding, ultrasonic welding, or other welding methods. In other embodiments, the valve plate 321 can be connected to the cover plate body 33 by bonding, riveting, snap-fitting, or other connection methods.

[0076] In some embodiments, such as Figure 2 and Figure 3 As shown, the explosion-proof valve 32 also includes a protective element 323. The protective element 323 and the valve plate 321 are disposed on two pairs of sides of the valve hole 322. The protective element 323 is disposed on the side of the valve hole 322 away from the manifold 20, and the valve plate 321 is disposed on the side of the valve hole 322 close to the manifold 20.

[0077] When the internal pressure of the battery reaches the preset pressure, the gas breaks through the position of the valve plate 321 with the preset scratch and flows to the valve hole 322, and then breaks through the protective member 323 to be discharged to the outside of the battery, thereby realizing the exhaust and pressure relief.

[0078] The protective component 323 can prevent external dust, oil and other impurities from entering the battery, and can prevent impurities from contaminating and clogging the explosion-proof valve 32, thus affecting the explosion-proof performance of the explosion-proof valve 32.

[0079] Please see Figure 9 This is a structural block diagram of a single battery cell 200 provided in an embodiment of this application. Figure 9 As shown, the single cell 200 includes the battery end cap assembly 100 and the electrode assembly 150 provided in any of the foregoing embodiments.

[0080] The electrode assembly 150 is located on the side of the disk body 21 away from the second connecting section 222, that is, on the side of the disk body 21 away from the support portion 13. The electrode assembly 150 can be welded to the disk body 21. The electrode assembly 150 may include a multi-layer core and multiple tabs. The multi-layer core can be formed by sequentially stacking and winding a positive electrode sheet, a separator, a negative electrode sheet, and a separator to form a cylindrical structure. The multiple tabs are arranged radially along the electrode assembly 150. The tabs are connected to the positive or negative electrode sheet and protrude from the end of the core to adhere to and weld to the disk body 21.

[0081] The single battery cell 200 further includes a housing with an opening. The battery end cap assembly 100 covers the opening and cooperates with the housing to form a cavity. The electrode assembly 150 is housed in the cavity.

[0082] The housing may be cylindrical, with openings at both ends along the axial direction. The cover plate 30 covers one of the openings and cooperates with the housing to form the cavity. The insulating member 10, the current collector 20, and the electrode assembly 150 are housed within the cavity. The housing may also be cylindrical.

[0083] Please see Figure 10 This is a structural block diagram of the battery pack 300 provided in an embodiment of this application. Figure 10 As shown, the battery pack 300 includes the aforementioned single battery cell 200.

[0084] The battery pack 300 may also include a battery management system.

[0085] Please see Figure 11 This is a structural block diagram of the electrical equipment 400 provided in an embodiment of this application. Figure 11 As shown, the electrical equipment 400 includes the aforementioned battery pack 300.

[0086] The electrical equipment 400 may be an electric vehicle, a hybrid vehicle, an energy storage power station, etc.

[0087] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0088] The above are the implementation methods of the embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the embodiments of this application, and these improvements and modifications are also considered to be within the protection scope of this application.

Claims

1. A battery end cap assembly (100), characterized in that, The battery end cap assembly (100) includes: An insulating member (10) includes a main body (11) and at least one positioning part (12). The main body (11) includes a first surface (111) and a second surface facing away from each other. The first surface (111) includes a pole fixing area (111a). The at least one positioning part (12) is disposed on the first surface (111) and adjacent to the pole fixing area (111a). The collector plate (20) includes a plate body (21) and a handle (22). The handle (22) includes a first connecting section (221) disposed in the pole fixing area (111a) and a second connecting section (222) connected to the plate body (21). The second connecting section (222) and the first connecting section (221) are arranged at an angle, as are the second connecting section (222) and the plate surface of the plate body (21). The joint between the first connecting section (221) and the second connecting section (222) is in contact or clearance fit with the side of the at least one positioning part (12) adjacent to the pole fixing area (111a). Cover plate (30) is disposed on the second surface side of the insulating member (10); and The pole assembly (40) passes through the cover plate (30), the pole fixing area (111a) and the first connecting section (221), and is fixedly connected to the cover plate (30), the insulating member (10) and the first connecting section (221).

2. The battery end cap assembly (100) according to claim 1, characterized in that, The first connecting segment (221) includes a first connecting segment first end (2211) and a first connecting segment second end (2212) opposite to each other. The second connecting segment (222) includes a second connecting segment first end (2221) and a second connecting segment second end (2222). The disk body (21) includes a disk body first end (211) and a disk body second end (212) opposite to each other. The second connecting segment second end (2212) is connected to the second connecting segment first end (2221). 222) is connected to the first end (211) of the disk body. The first end (2211) of the first connecting segment, the second end (2222) of the second connecting segment and the first end (211) of the disk body are located on the first side of the central region of the pole post fixing area (111a). The second end (2212) of the first connecting segment, the first end (2221) of the second connecting segment and the second end (212) of the disk body are located on the second side of the central region of the pole post fixing area (111a). The second side is opposite to the first side.

3. The battery end cap assembly (100) according to claim 1, characterized in that, The first included angle between the second connecting segment (222) and the first connecting segment (221) and the second included angle between the second connecting segment (222) and the disk surface of the disk body (21) are both greater than 0° and less than 90°.

4. The battery end cap assembly (100) according to claim 1, characterized in that, The positioning part (12) includes a first end (121) and a second end (122) opposite to each other. The first end (121) is connected to the main body (11), and the second end (122) is away from the main body (11). The side of the first end (121) near the pole fixing area (111a) is provided with a first chamfer (121a), and is transitionally connected to the main body (11) through the first chamfer (121a). The arc surface of the first chamfer (121a) is recessed toward the connection between the positioning part (12) and the main body (11).

5. The battery end cap assembly (100) according to claim 4, characterized in that, The distance from the end of the first chamfer (121a) away from the main body (11) to the main body (11) is 1 / 6 to 1 / 2 of the height of the positioning part (12), the height of the positioning part (12) being the dimension along the direction perpendicular to the main body (11).

6. The battery end cap assembly (100) according to claim 1, characterized in that, The height of the positioning part (12) is greater than the thickness of the first connecting section (221). The height of the positioning part (12) is the dimension along the direction perpendicular to the main body part (11), and the thickness of the first connecting section (221) is the dimension along the direction perpendicular to the main body part (11).

7. The battery end cap assembly (100) according to claim 6, characterized in that, The height of the positioning part (12) is 2 to 4 times the thickness of the first connecting section (221).

8. The battery end cap assembly (100) according to claim 6 or 7, characterized in that, The height of the positioning part (12) is greater than or equal to 3mm.

9. The battery end cap assembly (100) according to claim 1, characterized in that, The width direction of the second connecting segment (222) is parallel to the extension direction of the positioning part (12). The at least one positioning part (12) includes one, and the perpendicular line of the second connecting segment (222) perpendicular to the width direction of the second connecting segment (222) coincides with the perpendicular line of the positioning part (12) perpendicular to the extension direction of the positioning part (12); or, the at least one positioning part (12) includes multiple, and the multiple positioning parts (12) are symmetrically arranged with the perpendicular line of the second connecting segment (222) perpendicular to the width direction of the second connecting segment (222) as the axis of symmetry.

10. The battery end cap assembly (100) according to claim 9, characterized in that, The at least one positioning part (12) includes one, the length of which is greater than or equal to half the width of the second connecting segment (222); or, the at least one positioning part (12) includes two, the length of which is greater than or equal to 1 / 4 of the width of the second connecting segment (222).

11. The battery end cap assembly (100) according to claim 1, characterized in that, The at least one positioning part (12) includes a plurality of positioning parts (12), which are arranged at intervals along the width direction of the second connecting segment (222), and the distance between two adjacent positioning parts (12) is greater than or equal to 2.5 mm and less than or equal to 5 mm.

12. The battery end cap assembly (100) according to claim 4, characterized in that, The second end (122) of the positioning part (12) has a second chamfer on the side near the pole fixing area (111a), and the arc surface of the second chamfer protrudes in a direction away from the positioning part (12).

13. The battery end cap assembly (100) according to claim 1, characterized in that, The insulating member (10) further includes at least one support portion (13), which is disposed on the side of the main body (11) near the collector plate (20) and surrounds at least a portion of the pole fixing area (111a). The side of the disk body (21) near the second connecting section (222) contacts or is clearance-fitted with the end of the support portion (13) away from the main body (11). The height of each support portion (13) is greater than the height of the at least one positioning portion (12). The height of the support portion (13) is the dimension of the support portion (13) in the direction perpendicular to the main body (11), and the height of the positioning portion (12) is the dimension of the positioning portion (12) in the direction perpendicular to the main body (11).

14. The battery end cap assembly (100) according to claim 13, characterized in that, The insulating member (10) further includes an air passage (14) that passes through the main body (11) and is located on the side of the at least one positioning part (12) away from the pole fixing area (111a). The at least one positioning part (12) is spaced apart from the at least one support part (13).

15. The battery end cap assembly (100) according to claim 1, characterized in that, The insulating member (10) further includes an abutment portion (15), which is disposed on the first surface (111) of the main body portion (11). The abutment portion (15) and the at least one positioning portion (12) are arranged around the pole fixing area (111a). One end of the first connecting segment (221) away from the positioning portion (12) abuts against the side of the abutment portion (15) near the pole fixing area (111a).

16. The battery end cap assembly (100) according to claim 15, characterized in that, The abutting portion (15) includes a first abutting section (151) and a second abutting section (152). The first abutting section (151) and the second abutting section (152) are arranged at an angle. The first abutting section (151) and the positioning portion (12) are located on opposite sides of the pole fixing area (111a). The second abutting section (152) is located between the first abutting section (151) and the positioning portion (12). The first connecting section (221) includes a first mating edge (2213) and a second mating edge (2214). The first mating edge (2213) is away from the positioning portion (12). The second mating edge (2214) is adjacent to the first mating edge (2213). The first abutting section (151) abuts against the first mating edge (2213). The second abutting section (152) abuts against the second mating edge (2214).

17. The battery end cap assembly (100) according to claim 14, characterized in that, The cover plate (30) includes an explosion-proof valve (32), the orthographic projection of which on the main body (11) at least partially overlaps with the air passage (14).

18. The battery end cap assembly (100) according to claim 1, characterized in that, The distance between the junction of the first connecting segment (221) and the second connecting segment (222) and the side of the at least one positioning part (12) adjacent to the pole fixing area (111a) is greater than or equal to 0 and less than or equal to 2 mm.

19. The battery end cap assembly (100) according to claim 13, characterized in that, The distance between the side of the disc (21) near the second connecting section (222) and the end of the support (13) away from the main body (11) is greater than or equal to 0 and less than or equal to 1 mm.

20. A single-cell battery (200), characterized in that, The single battery cell (200) includes a battery end cap assembly (100), an electrode assembly (150), and a housing as described in any one of claims 1-19. The electrode assembly (150) is disposed on the side of the disc body (21) away from the second connecting section (222). The housing has an opening. The battery end cap assembly (100) covers the opening and cooperates with the housing to form a cavity. The electrode assembly (150) is accommodated in the cavity.

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