Packaging assembly, battery cell and battery pack

Abstract

The invention provides a packaging assembly, a battery cell and a battery pack. The packaging assembly comprises an end plate, a terminal and a sealing nail. Mounting through holes are formed in the end plates; the terminal comprises a column body and a first baffle plate which are connected with each other, the column body is arranged in the mounting through hole in a penetrating manner, the first baffle plate is provided with an assembly hole, and the assembly hole penetrates through the first baffle plate and extends into the column body; the sealing nail comprises a rod part and a second baffle which are connected, the end, away from the second baffle, of the rod part is inserted into the assembly hole, the edge of the first baffle is arranged around the column body, and the edge of the second baffle extends towards the edge of the first baffle in the radial direction of the column body. The edge of the second baffle plate extends to the edge of the first baffle plate, so that the structural strength of a conductive structure formed by the terminal and the sealing nail at the first baffle plate can be increased, and the second baffle plate can be welded with the connecting bar to increase the distance between the welding part of the conductive structure and the connecting bar and the upper plastic part; and the upper plastic part is prevented from being damaged due to high welding temperature. Therefore, the reliability of the battery cell can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a packaging component, a battery cell and a battery pack. Background Art

[0002] The conductive structure is a key component that electrically connects the internal and external components of a battery cell (also known as a battery cell or single cell). One end of the conductive structure is connected to the circuitry outside the battery cell, for example, the conductive structure is connected to the battery module's connector bar. The other end of the conductive structure is connected to the internal circuitry of the battery cell, for example, the conductive structure is connected to the tab through a current collector, or the conductive structure is directly connected to the tab.

[0003] In the related art, the reliability of the conductive structure is poor, which leads to poor reliability of the battery cell. Summary of the Invention

[0004] The embodiments of the present application provide a packaging assembly, a battery cell, and a battery pack, which can enhance the reliability of the conductive structure to improve the reliability of the battery cell.

[0005] In the first aspect, an embodiment of the present application provides a packaging component, which includes an end plate, a terminal and a sealing nail; the end plate is provided with a mounting through hole; the terminal includes a column and a first baffle, one end of the column is connected to the first baffle, and the other end is passed through the mounting through hole, and the end of the first baffle away from the column is provided with an assembly hole, which passes through the first baffle and extends into the column; the sealing nail includes a rod and a second baffle, one end of the rod is connected to the second baffle, and the other end is inserted into the assembly hole, and the second baffle is located on the side of the first baffle away from the end plate; wherein, the edge of the first baffle is arranged around the column, and the edge of the second baffle extends radially toward the edge of the first baffle along the column.

[0006] In one embodiment, the terminal further includes a third baffle, which is located on a side of the end plate away from the first baffle, and is connected to an end of the column away from the first baffle.

[0007] In one embodiment, the first baffle is formed by bending.

[0008] In one embodiment, an annular groove is provided on a surface of the first baffle facing away from the end plate, and the annular groove extends along the circumference of the terminal.

[0009] In one embodiment, a convex ring is provided on the surface of the second baffle facing the first baffle, and the convex ring is inserted into the annular groove.

[0010] In one embodiment, along the axial direction of the terminal, the first baffle has a thickness dimension D1, and the annular groove has a depth dimension D2, satisfying: 0<D2≤0.4D1.

[0011] In one embodiment, the diameter of the column is φ1, and the diameter of the center line of the annular groove is φ2, satisfying: φ2≤φ1.

[0012] In one embodiment, the inner wall of the annular groove is concave and has an arc shape.

[0013] In one embodiment, the outer diameter of the first baffle is A1, and the outer diameter of the second baffle is A2, satisfying: 0.8A1≤A2≤1.2A1.

[0014] In one embodiment, the assembly hole is a tapered hole, and the small diameter end of the assembly hole is farther away from the first baffle than the large diameter end of the assembly hole; the outer peripheral surface of the rod portion is in contact with the hole wall of the assembly hole.

[0015] In one embodiment, an angle α is formed between the hole wall of the assembly hole and the axis of the assembly hole, which satisfies: 0<α≤30°.

[0016] In one embodiment, the first baffle and the second baffle are welded.

[0017] In one embodiment, the weld penetration of the weld mark formed on the first baffle is D3, satisfying: D3≥0.2mm; and / or the distance between the weld mark and the surface of the first baffle facing away from the second baffle is D4, D4≥0.15mm.

[0018] In one embodiment, the diameter of the column is φ1, and the diameter of the assembly hole is φ3, satisfying: 0.5 mm ≤ φ3 ≤ 0.8 φ1.

[0019] In one embodiment, the height dimension of the terminal is H1, and the depth dimension of the assembly hole is H2, satisfying: 0.5H1≤H2≤0.9H1.

[0020] In one embodiment, the packaging assembly further includes a first insulating member disposed between the first baffle and the end plate.

[0021] In one embodiment, the packaging assembly further includes a casing, and the end plate is connected to the casing and closes an opening at one end of the casing.

[0022] In one embodiment, the circumferential cylinder and the end plate are integrally formed, or the circumferential cylinder and the end plate are welded.

[0023] In the second aspect, an embodiment of the present application provides a battery cell, which includes a packaging plate, an electrode assembly and the aforementioned packaging assembly; the packaging assembly and the packaging plate cover each other to define a accommodating cavity; the electrode assembly is arranged in the accommodating cavity; the electrode assembly is connected to one end of the column away from the second baffle.

[0024] On the third aspect, an embodiment of the present application provides a battery pack, which includes a box body, a box cover and the aforementioned battery cells; the box body has an installation cavity; the box cover is closed with the box body; there are multiple battery cells, multiple battery cells are arranged in the installation cavity, and the multiple battery cells are electrically connected.

[0025] Beneficial effects of the embodiments of the present application:

[0026] In the embodiments of the present application, by providing a second baffle with its edge extending toward the edge of the first baffle, the structural strength of the conductive structure consisting of the terminal and sealing pin at the first baffle is increased, thereby improving the conductive structure's resistance to deformation and, consequently, enhancing the seal between the terminal and the housing. Furthermore, by welding the second baffle to the connecting bar, the distance between the conductive structure and the connecting bar welded thereto is increased, effectively preventing damage to the upper plastic part due to high welding temperatures. This improves the reliability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a schematic structural diagram of a packaging assembly provided in an embodiment of the present application;

[0029] Figure 2 is a schematic structural diagram of another packaging assembly provided by an embodiment of the present application;

[0030] Figure 3 Schematic diagram of the cooperation between the terminal and the sealing nail provided in the embodiment of the present application;

[0031] Figure 4 Schematic diagram of welding a sealing pin and a connecting bar provided in an embodiment of the present application;

[0032] Figure 5 yes Figure 3 Schematic diagram of the structure at A in the middle;

[0033] Figure 6 is a structural diagram of another packaging component provided by an embodiment of the present application;

[0034] Figure 7 yes Figure 3 Schematic diagram of the enlarged structure at B in the middle;

[0035] Figure 8 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;

[0036] Figure 9 It is a schematic structural diagram of the battery pack provided in an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 01-Packaging components;

[0039] 11-end plate; 111-mounting through hole;

[0040] 12-terminal; 121-column; 122-first baffle; 123-third baffle; 124-annular groove; 125-assembly hole;

[0041] 13-sealing pin; 131-rod; 132-second baffle; 133-convex ring;

[0042] 14-weld stamp; 15-first insulating member; 16-circumferential tube;

[0043] 02-battery cell; 21-package plate; 22-electrode assembly; 23-positive electrode ear; 24-accommodation cavity;

[0044] 03-battery pack; 31-box; 311-installation cavity; 32-box cover; 33-connection row. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0046] In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain this application and are not used to limit this application. In this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] The terms "comprises," "comprising," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such product.

[0048] In the description of the embodiments of this application, words such as "example" or "for example" are used to indicate an example, illustration, or description. Any embodiment or design described as "for example" or "for example" in the embodiments of this application is not to be construed as being preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to clearly present relative concepts.

[0049] Before introducing a packaging assembly, a battery cell, and a battery pack provided by the embodiments of the present application, the relevant technologies of the present application are first introduced.

[0050] In the related art, the battery cell includes a shell, an electrode assembly arranged in the shell, and a conductive structure passing through the shell. The shell can be formed by a shell with an opening at one end and an end cover covering each other, or it can be formed by a shell with openings at both ends and two end covers covering each other. The battery cell can include a conductive structure, which is passed through the end cover, the positive electrode ear is electrically connected to the end of the conductive structure located in the shell, and the negative electrode ear is electrically connected to the shell. The battery cell can also include two conductive structures. Correspondingly, the two conductive structures can be arranged on the same end cover, or the two conductive structures can be arranged on two end covers respectively, or one conductive structure can be arranged on the end cover, and the other conductive structure can be arranged on the closed end of the shell. At this time, the ends of the two conductive structures located in the shell are electrically connected to the positive electrode ear and the negative electrode ear respectively.

[0051] The conductive structure includes a terminal that is inserted into the shell and a sealing pin welded to the terminal. In order to prevent the conductive structure from falling out of the shell, the end of the terminal located inside the shell is provided with an inner rib, which cooperates with the shell stop. Correspondingly, in order to prevent the conductive structure from falling into the shell, the end of the terminal located outside the shell is provided with an outer rib, which cooperates with the shell stop. Correspondingly, an upper plastic part is provided between the outer rib and the shell to insulate and isolate the conductive structure from the shell; a sealing ring is provided between the terminal and the shell to seal the part where the shell and the terminal cooperate; and a lower plastic part is provided between the inner rib and the shell to insulate and isolate the conductive structure from the shell.

[0052] During the battery cell production process, an assembly hole is opened at the end of the terminal outside the casing to facilitate the welding of the terminal and the current collector together through a penetration welding process on the outside of the battery cell. After the terminal and the current collector are welded together, to ensure the sealing of the terminal in the opening area and the overall structural strength of the terminal, it is necessary to weld a sealing pin into the assembly hole to achieve a sealed assembly hole and improve the overall structural strength of the terminal.

[0053] Since the outer rib is a flange structure formed by folding part of the material at the outer end of the terminal, in order to ensure smooth folding and improve the flatness of the flange, the thickness of the outer rib should not be too large. In addition, in order to ensure the firmness of the electrical connection between the battery cells, the welding depth formed by welding the flange to components such as the connecting bar of the battery pack needs to be deeper. In this way, when welding the outer rib to the connecting bar, it is easy for the outer rib to be welded through, thereby damaging the upper plastic part, which has an adverse effect on the sealing and insulation isolation between the terminal and the shell, and thus reduces the reliability of the battery cell. In addition, due to the small thickness of the outer rib, the strength of the conductive structure at the outer rib is relatively small. When the internal pressure of the battery cell increases, the sealing fit between the conductive structure and the shell is likely to fail. As a result, the reliability of the battery cell is low.

[0054] In addition, the outer end face of the sealing pin is located in the assembly hole, which is lower than the outer end face of the terminal, resulting in the portion of the conductive structure used for welding with the connecting bar being the annular end face of the terminal set around the sealing pin, resulting in a smaller welding area between the conductive structure and the connecting bar, and further resulting in poor welding reliability between the conductive structure and the connecting bar, which has an adverse effect on the overcurrent reliability of the battery module.

[0055] Based on this, the embodiments of the present application provide a packaging assembly, a battery cell, and a battery pack that can increase the distance between the welding area between the conductive structure and the connecting bar and the upper plastic part to avoid damage to the upper plastic part, and can also improve the overall strength of the conductive structure to improve the sealing between the conductive structure and the outer shell. In this way, the reliability of the battery cell can be improved. In addition, the welding area between the conductive structure and the connecting bar can be increased to facilitate improving the welding reliability between the conductive structure and the connecting bar, thereby improving the reliability of the connection between the battery cells and facilitating the improvement of the overcurrent reliability of the battery module.

[0056] The following combination Figures 1 to 9 , a packaging component, a battery cell and a battery pack provided in the embodiments of the present application are described in detail respectively.

[0057] See also Figure 1 or Figure 2 , Figure 1 is a structural diagram of the packaging component 01 provided in an embodiment of the present application, Figure 2It is a structural schematic diagram of another packaging component 01 provided by an embodiment of the present application. In the first aspect, an embodiment of the present application provides a packaging component 01. The packaging component 01 includes an end plate 11, a terminal 12 and a sealing nail 13. The end plate 11 is provided with a mounting through-hole 111. The terminal 12 includes a column 121 and a first baffle 122. One end of the column 121 is connected to the first baffle 122, and the other end is passed through the mounting through-hole 111. An assembly hole 125 is provided at the end of the first baffle 122 facing away from the column 121. The assembly hole 125 passes through the first baffle 122 and extends into the column 121. The sealing nail 13 includes a rod 131 and a second baffle 132. One end of the rod 131 is connected to the second baffle 132, and the other end is inserted into the assembly hole 125. The second baffle 132 is located on the side of the first baffle 122 connected to the end plate 11. The edge of the first baffle 122 is arranged around the column 121, and the edge of the second baffle 132 extends radially toward the edge of the first baffle 122 along the rod portion 131. Figure 3 As shown, Figure 3 It is a schematic diagram of the cooperation between the terminal 12 and the sealing nail 13 provided in an embodiment of the present application.

[0058] It can be understood that the packaging component 01 is used to package the electrodes, electrolyte, etc. inside the battery cell to prevent external environmental factors from affecting the internal components of the battery cell, and also to avoid leakage of internal substances of the battery cell.

[0059] It can be understood that the end plate 11 can be a cover plate of the battery cell 20, such as Figure 1 The end plate 11 may also be the closed end of the housing of the battery cell 20, as shown Figure 2 shown.

[0060] The surface of the second baffle 132 facing away from the first baffle 122 is configured to be welded to the connecting bar 33, such as Figure 3 As shown, Figure 4 Schematic diagram of welding the sealing pin 13 and the connecting row 33 provided in an embodiment of the present application.

[0061] Specifically, one end of the column 121 is perpendicularly connected to the first baffle 122. One end of the rod 131 is perpendicularly connected to the second baffle 132, and the other end is inserted into the assembly hole 125. Exemplarily, the first baffle 122 extends along the circumference of the column 121 as an annular plate. The second baffle 132 extends along the circumference of the rod 131 as an annular plate.

[0062] Specifically, the assembly hole 125 is extended along the axial direction of the column.

[0063] It can be understood that the packaging component 01 also includes a plastic part, which is used to insulate and isolate the first baffle 122 and the end plate 11.

[0064] It can be understood that the second baffle 132 can be connected to the first baffle 122 in at least one of the following ways: welding, riveting, abutting, and clamping.

[0065] It is understood that there is at least one welding point between the sealing pin 13 and the terminal 12. If there is one welding point, the first baffle 122 and the second baffle 132 are welded together, thereby sealing the assembly hole 125 and connecting the mating edges of the terminal 12 and the sealing pin 13 into one body, thereby improving the integrity of the conductive structure.

[0066] For example, the first baffle 122 may be formed with the column 121 by folding, the first baffle 122 may be welded to the column 121, or the first baffle 122 may be integrally formed with the column 121 by casting.

[0067] For example, the second baffle 132 may be welded to the rod portion 131 , the second baffle 132 may be formed by pressing, or the second baffle 132 may be integrally formed with the column 121 by casting.

[0068] In this embodiment, by providing a second baffle 132 and extending its edge toward the edge of the first baffle 122, the structural strength of the conductive structure composed of the terminal 12 and the sealing pin 13 at the first baffle 122 is increased, thereby improving the conductive structure's resistance to deformation and thereby enhancing the seal between the terminal 12 and the housing. Furthermore, the second baffle 132 is welded to the connecting bar 33, thereby increasing the distance between the welded portion of the conductive structure and the connecting bar 33 and the upper plastic component, effectively preventing damage to the upper plastic component due to high welding temperatures. This improves the reliability of the battery cell 02.

[0069] See also Figure 1 and Figure 3 In one embodiment, the terminal 12 further includes a third stopper 123. The third stopper 123 is located on the side of the end plate 11 facing away from the first stopper 122. The third stopper 123 is connected to the end of the column 121 facing away from the first stopper 122. This allows the terminal 12 to engage with the end plate 11 in two directions via the first and third stoppers 122, preventing the conductive structure from falling into the housing while also preventing it from falling out of the housing. This improves the reliability of the battery cell 02.

[0070] In one embodiment, the first baffle 122 is formed by bending.

[0071] In another embodiment, the first baffle 122 is welded to the column 121 .

[0072] It can be understood that compared with fixing the first baffle 122 on the column 121 by welding, bending can simplify the forming steps of the first baffle 122, thereby improving the forming efficiency and avoiding defects such as cold welding and weld penetration caused by the welding process.

[0073] See also Figure 3 and Figure 5 , Figure 5 yes Figure 3 In one embodiment, an annular groove 124 is provided on the surface of the first baffle 122 facing away from the end plate 11 , and the annular groove 124 extends along the circumference of the terminal 12 .

[0074] It is understandable that when the first baffle 122 is bent and formed by the flanging process, the portion of the first baffle 122 close to its periphery will rebound and warp upward, resulting in poor flatness of the first baffle 122.

[0075] Based on this, in this embodiment, by providing the annular groove 124 , a place for pre-releasing stress can be provided for the first baffle 122 during the bending process, thereby effectively reducing the amplitude of the first baffle 122 rebounding and warping, thereby improving the flatness of the first baffle 122 .

[0076] See also Figure 3 and Figure 5 In one embodiment, a protruding ring 133 is provided on the surface of the second baffle 132 facing the first baffle 122. The protruding ring 133 is inserted into the annular groove 124. This increases the mating area between the first baffle 122 and the second baffle 132, thereby improving the mating reliability between the terminal 12 and the sealing pin 13. The mating of the sealing pin 13 and the terminal 12 can also be used to position the mating through the mating of the protruding ring 133 and the annular groove 124, thereby improving the relative position accuracy between them.

[0077] In one embodiment, along the axial direction of the terminal 12 , the first stopper 122 has a thickness dimension D1 , and the annular groove 124 has a depth dimension D2 , satisfying the following relationship: 0<D2≤0.4D1.

[0078] It can be understood that the depth dimension D2 of the annular groove 124 includes but is not limited to: 0.01D1, 0.02D1, 0.03D1, 0.04D1, 0.08D1, 0.10D1, 0.11D1, 0.12D1, 0.13D1, 0.16D1, 0.17D1, 0.18D1, 0.19D1, 0.20D1, 0.22D1, 0.23D1, 0.24D1, 0.25D1, 0.28D1, 0.30D1, 0.31D1, 0.32D1, 0.33D1, 0.34D1, 0.36D1, 0.37D1, 0.38D1, 0.39D1, and 0.4D1.

[0079] In this embodiment, through the above-mentioned limitation, the depth dimension D2 of the annular groove 124 can be prevented from being too large and affecting the strength of the first baffle 122, thereby ensuring the structural strength of the terminal 12 and preventing deformation of the terminal 12, which is beneficial to improving the sealing between the terminal 12 and the end plate 11.

[0080] In one embodiment, the diameter of the column 121 is φ1, and the diameter of the center line of the annular groove 124 is φ2, satisfying the condition: φ2 ≤ φ1. This effectively reduces the pressure on the connection between the first baffle 122 and the column 121, facing away from the second baffle 132, toward the axis of the terminal 12 during the bending process of the first baffle 122, thereby ensuring the size of the mating hole and facilitating the subsequent smooth installation of the sealing pin 13.

[0081] The middle ring line of the annular groove 124 refers to the ring line corresponding to half the sum of the inner diameter and the outer diameter thereof.

[0082] See also Figure 5 In one embodiment, the inner wall of the annular groove 124 is concave and has an arc shape. This can reduce stress concentration in the annular groove 124 , improve the stress state of the terminal 12 , and thus enhance the reliability of the package assembly 01 .

[0083] See also Figure 3 In one embodiment, the outer diameter of the first baffle 122 is A1, and the outer diameter of the second baffle 132 is A2, satisfying: 0.8A1≤A2≤1.2A1.

[0084] It can be understood that the outer diameter of the second baffle 132 includes but is not limited to: 0.8A1, 0.81A1, 0.82A1, 0.83A1, 0.84A1, 0.85A1, 0.86A1, 0.87A1, 0.88A1, 0.89A1, 0.9A1, 0.91A1, 0.92A1, 0.93A1, 0.94A1, 0.95A1, 0.96A1, 0.97A1, 0.98A1, 0.99A1, A1, 1.02A1, 1.04A1, 1.06A1, 1.08A1, 1.10A1, 1.12A1, 1.14A1, 1.16A1, 1.18A1, 1.2A1.

[0085] In this embodiment, through the above-mentioned limitations, on the one hand, the second baffle 132 can have a larger area for welding with the connecting bar 33, thereby improving the reliability of welding the second baffle 132 and the connecting bar 33; on the other hand, the size of the second baffle 132 can be controlled to avoid an increase in material cost due to an excessively large outer diameter, and the impact of the second baffle 132 on the layout of other components can be reduced.

[0086] See also Figure 6 , Figure 6 This is a schematic diagram of the structure of another packaging assembly 01 provided in an embodiment of the present application. In one embodiment, the assembly hole 125 is a tapered hole. The smaller diameter end of the assembly hole 125 is further away from the first baffle 122 than the larger diameter end of the assembly hole 125. The outer circumference of the rod portion 131 is in contact with the wall of the assembly hole 125.

[0087] It is understandable that when the assembly hole 125 is a hole of equal diameter, if there is a large deviation between the diameter of the rod portion 131 and the diameter of the assembly hole 125 , the coaxiality of the sealing pin 13 and the terminal 12 will be greatly different.

[0088] Based on this, in this embodiment, by defining assembly hole 125 as a tapered hole, the self-centering function of the tapered hole can be utilized to more easily achieve a high degree of coaxiality between sealing pin 13 and assembly hole 125. Specifically, the taper of the tapered hole allows the stem 131 of sealing pin 13 to contact the wall of assembly hole 125 during assembly of sealing pin 13 and terminal 12, generating a radial force. This force automatically causes sealing pin 13 to move toward the axis of assembly hole 125.

[0089] See also Figure 6 In one embodiment, an angle α is formed between the hole wall of the assembly hole 125 and the axis of the assembly hole 125, satisfying: 0<α≤30°.

[0090] It will be understood that the angle α includes but is not limited to 0.10°, 0.20°, 0.30°, 0.40°, 0.50°, 0.60°, 0.70°, 0.80°, 0.90°, 1.00°, 2.00°, 4.00°, 6.00°, 8.00°, 10.00°, 12.00°, 14.00°, 16.00°, 18.00°, 20.00°, 22.00°, 24.00°, 26.00°, 28.00°, 29.00°, 29.10°, 29.20°, 29.30°, 29.40°, and 30°.

[0091] In this embodiment, by limiting the angle α, on the one hand, the assembly hole 125 can be made into a tapered hole, thereby improving the coaxiality between the sealing pin 13 and the assembly hole 125. On the other hand, it can avoid the orifice size of the assembly hole 125 being too large and affecting the setting of other structures (for example, the annular groove 124).

[0092] See also Figure 1 or Figure 3In one embodiment, the first baffle 122 and the second baffle 132 are welded. This allows the metal materials of the first baffle 122 and the second baffle 132 to bond at the atomic level, improving the reliability and stability of the connection between the terminal 12 and the sealing pin 13. It also achieves a seamless connection between the first baffle 122 and the second baffle 132, effectively ensuring the sealing of the mating hole. This improves the reliability of the battery cell 02.

[0093] It is understood that the weld penetration of the weld mark 14 formed on the first baffle 122 is less than the weld penetration formed by directly welding the first baffle 122 to a component such as a battery pack connector in the related art. Therefore, when welding the first baffle 122 to the second baffle 132, the thermal impact of the welding on other components is minimal.

[0094] See also Figure 7 , Figure 7 yes Figure 3 Figure 1 shows an enlarged schematic diagram of the structure at point B. In one embodiment, the weld penetration depth of the weld mark 14 formed on the first baffle 122 is D3, satisfying the requirement D3 ≥ 0.2 mm. This ensures that the weld mark 14 formed by the welding between the first baffle 122 and the second baffle 132 has a sufficient depth, thereby ensuring the reliability of the weld between the first baffle 122 and the second baffle 132.

[0095] See also Figure 7 The distance D4 between the weld mark 14 and the surface of the first baffle 122 facing away from the second baffle 132 is ≥ 0.15 mm. This reduces the thermal impact of the weld between the first baffle 122 and the second baffle 132 on the plastic component, thereby improving the sealing between the terminal and the end plate 11.

[0096] See also Figure 3 In one embodiment, the diameter of the column 121 is φ1, and the diameter of the assembly hole 125 is φ3, satisfying: 0.5mm≤φ3≤0.8φ1.

[0097] In one embodiment, the height dimension of the terminal 12 is H1, and the depth dimension of the assembly hole 125 is H2, which satisfies: 0.5H1≤H2≤0.9H1.

[0098] It can be understood that the depth dimension H2 of the assembly hole 125 is, but is not limited to, 0.5H1, 0.51H1, 0.52H1, 0.53H1, 0.54H1, 0.55H1, 0.56H1, 0.57H1, 0.58H1, 0.59H1, 0.60H1, 0.61H1, 0.62H1, 0.63H1, 0.64H1, 0.65H1, 0.66H1, 0.67H1, 0.68H1, 0.69H1, 0.70H1, 0.71H1, 0.72H1, 0.73H1, 0.74H1, 0.75H1, 0.76H1, 0.77H1, 0.78H1, 0.79H1, 0.80H1, 0.81H1, 0.82H1, 0.83H1, 0.84H1, 0.85H1, 0.86H1, 0.87H1, 0.88H1 .68H1, 0.69H1, 0.70H1, 0.71H1, 0.72H1, 0.73H1, 0.74H1, 0.75H1, 0.76H1, 0.77H1, 0.78H1 , 0.79H1, 0.8H1, 0.82H1, 0.83H1, 0.84H1, 0.85H1, 0.86H1, 0.87H1, 0.88H1, 0.89H1, 0.9H1.

[0099] In this embodiment, the above-mentioned restrictions ensure that the sealing pin 13 and the assembly hole 125 have a sufficient fit, thereby improving the reliability of the fit between the sealing pin 13 and the terminal 12. Furthermore, this prevents the fit from being too large, which could result in lower strength at the bottom of the assembly hole 125. This improves the reliability of the connection between the terminal 12 and the sealing pin 13, thereby improving the reliability of the battery cell 02.

[0100] Please refer to Figure 1 In one embodiment, the package assembly 01 further includes a first insulating member 15. The first insulating member 15 is disposed between the first barrier plate 122 and the end plate 11. In this way, the terminal 12 can be insulated from the end plate 11.

[0101] For example, the first insulating member 15 may be a plastic member.

[0102] like Figure 2 As shown, in one embodiment, the packaging assembly 01 further includes a casing 16. The end plate 11 is connected to the casing 16 and closes the opening at one end of the casing 16. It can be understood that when the packaging assembly is applied to the battery cell 02, it cooperates with the cover plate to encapsulate the components and materials inside the battery cell.

[0103] like Figure 2 As shown, in one embodiment, the circumference tube 16 is integrally formed with the end plate 11. This avoids weak links such as connection points or welds, thereby improving the strength of the package assembly, allowing the package assembly to withstand external forces more evenly and avoid deformation when subjected to loads such as impact and vibration.

[0104] In one embodiment, the shroud 16 is welded to the end plate 11. In this way, the end plate 11 and the shroud 16 can be welded after the terminals 12 and other components are installed on the end plate 11, so as to facilitate the ease of assembly of the terminals 12 and other components with the end plate 11.

[0105] See also Figure 8 , Figure 8 FIG2 is a schematic diagram of the structure of a battery cell 02 provided in an embodiment of the present application. Secondly, an embodiment of the present application provides a battery cell 02. Battery cell 02 includes a packaging plate 21, an electrode assembly 22, and the aforementioned packaging assembly 01. The packaging assembly 01 and packaging plate 21 overlap to define a receiving cavity 24. The electrode assembly 22 is disposed within the receiving cavity 24. The electrode assembly 22 is connected to the end of the column 121 that is distal to the second baffle 132.

[0106] It is understood that the electrode assembly 22 includes a positive electrode sheet, a separator, and a negative electrode sheet stacked in sequence. The positive electrode sheet may be connected to the terminal 12 via the positive electrode tab 23, and the negative electrode sheet may be connected to the packaging plate 21 or the end plate 11 via the negative electrode tab.

[0107] When the end plate 11 is a cover plate, the packaging plate 21 is a shell with one end open and the other end closed. The end plate is connected to the open end of the shell and closes the shell receiving cavity.

[0108] When the end plate 11 forms the closed end of the housing, the packaging assembly further includes a casing 16, with the packaging plate 21 serving as a cover. The packaging plate 21 and the end plate 11 are positioned at either end of the casing 16 to seal the housing cavity 24. Components such as the terminals 12 and sealing pins 13 provided in the embodiments of the present application can also be mounted on the packaging plate 21.

[0109] It can be understood that the battery cell 02 includes the aforementioned packaging component 01, and the battery cell 02 has all the beneficial effects of the packaging component 01, which will not be repeated here.

[0110] In a third aspect, embodiments of the present application provide a battery pack 03. The battery pack 03 includes a housing 31, a housing cover 32, and the aforementioned battery cells 02. The housing 31 has a mounting cavity 311. The housing cover 32 covers the housing 31. Multiple battery cells 02 are disposed within the mounting cavity 311. The multiple battery cells 02 are electrically connected.

[0111] The battery pack 03 further includes a plurality of connecting bars 33. Two adjacent battery cells 02 are electrically connected via the connecting bars 33. Specifically, the ends of the connecting bars 33 are connected to the second baffle.

[0112] It is understandable that the battery pack 03 may also include components such as a power manager.

[0113] It can be understood that the battery pack 03 includes the aforementioned battery cell 02, and the battery pack 03 has all the beneficial effects of the battery cell 02, which will not be repeated here.

[0114] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A packaging component, characterized in that: include: The end plate is provided with a mounting through hole; The terminal includes a column and a first baffle, wherein one end of the column is connected to the first baffle, and the other end is inserted into the mounting through hole. An assembly hole is provided on the end of the first baffle facing away from the column, and the assembly hole passes through the first baffle and extends into the column; A sealing nail comprising a rod and a second baffle, wherein one end of the rod is connected to the second baffle and the other end is inserted into the assembly hole, and the second baffle is located on a side of the first baffle away from the end plate; The edge of the first baffle is arranged around the column, and the edge of the second baffle extends toward the edge of the first baffle along the radial direction of the column.

2. The packaging assembly according to claim 1, wherein: The terminal further includes a third baffle, which is located on a side of the end plate away from the first baffle, and is connected to an end of the column away from the first baffle.

3. The packaging assembly according to claim 2, wherein: The first baffle is formed by bending.

4. The packaging assembly according to claim 3, wherein: An annular groove is provided on a surface of the first baffle facing away from the end plate, and the annular groove extends along the circumference of the terminal.

5. The packaging assembly according to claim 4, wherein: A convex ring is provided on a surface of the second baffle facing the first baffle, and the convex ring is inserted into the annular groove.

6. The packaging assembly according to claim 4, wherein: Along the axial direction of the terminal, the first baffle has a thickness dimension D1, and the annular groove has a depth dimension D2, satisfying: 0<D2≤0.4D1.

7. The packaging assembly according to claim 4, wherein: The diameter of the column is φ1, and the diameter of the center line of the annular groove is φ2, satisfying: φ2≤φ1.

8. The packaging assembly according to any one of claims 4 to 7, characterized in that: The inner wall of the annular groove is concave and is an arc-shaped surface.

9. The packaging assembly according to any one of claims 1 to 7, characterized in that: The outer diameter of the first baffle is A1, and the outer diameter of the second baffle is A2, which satisfies the following: 0.8A1≤A2≤1.2A1.

10. The packaging assembly according to any one of claims 1 to 7, characterized in that: The assembly hole is a tapered hole, and the small diameter end of the assembly hole is farther away from the first baffle than the large diameter end of the assembly hole; the outer peripheral surface of the rod portion is in contact with the hole wall of the assembly hole.

11. The packaging assembly according to claim 10, wherein: An included angle α is formed between the hole wall of the assembly hole and the axis of the assembly hole, satisfying the following: 0<α≤30°.

12. The packaging assembly according to any one of claims 1 to 7, characterized in that: The first baffle is welded to the second baffle.

13. The packaging assembly according to claim 12, wherein: The weld penetration of the weld mark formed on the first baffle is D3, which satisfies: D3 ≥ 0.2 mm; and / or, A distance D4 between the welding mark and a surface of the first baffle facing away from the second baffle is greater than or equal to 0.15 mm.

14. The packaging assembly according to any one of claims 1 to 7, characterized in that: The diameter of the column is φ1, and the diameter of the assembly hole is φ3, satisfying: 0.5mm≤φ3≤0.8φ1.

15. The packaging assembly according to any one of claims 1 to 7, characterized in that: The height dimension of the terminal is H1, and the depth dimension of the assembly hole is H2, which satisfies: 0.5H1≤H2≤0.9H1.

16. The packaging assembly according to any one of claims 1 to 7, characterized in that: The packaging assembly further includes a first insulating member disposed between the first baffle and the end plate.

17. The packaging assembly according to any one of claims 1 to 7, characterized in that: The packaging assembly further includes a surrounding cylinder, and the end plate is connected to the surrounding cylinder and closes an opening at one end of the surrounding cylinder.

18. The packaging assembly according to claim 17, wherein: The circumferential cylinder and the end plate are integrally formed, or the circumferential cylinder and the end plate are welded.

19. A battery cell, characterized in that: include: Package board; electrode assembly; as well as, The packaging assembly according to any one of claims 1-18, wherein the packaging assembly and the packaging plate overlap each other to define a accommodating cavity, the electrode assembly is arranged in the accommodating cavity, and the electrode assembly is connected to an end of the column away from the second baffle.

20. A battery pack, characterized in that: include: A box body having a mounting cavity; A box cover, which is closed with the box body; as well as, The battery cell as described in claim 19, wherein there are multiple battery cells, multiple battery cells are arranged in the installation cavity, and multiple battery cells are electrically connected.

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