Battery

Abstract

The invention provides a battery. The battery comprises a shell, a battery cell and a pole, the battery cell is located in the shell, the battery cell comprises a first tab, and a through hole is formed in the shell wall of the shell; the pole comprises a main body part and a flange annularly arranged on the periphery of the main body part along the circumferential direction of the main body part; the main body part is arranged in the through hole in a penetrating manner and is connected with the first tab; the flange is located on the inner side of the shell, and the outer contour of the projection of the flange on the shell wall is located on the periphery of the through hole. A sealing connection structure is arranged between the pole and the shell, the sealing connection structure comprises a metal sealing element and an insulating sealing element, and the metal sealing element is arranged on the flange and is in welded connection with the shell; and at least part of the insulating sealing element is positioned between the metal sealing element and the pole, so that the manufacturing precision and the assembly difficulty are reduced, and the assembly convenience and the safety of the battery are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery. Background Art

[0002] Batteries, such as lithium-ion batteries, are widely used not only in portable electronic devices such as mobile phones and laptops, but also in electric devices such as electric cars and electric bicycles.

[0003] The battery includes a shell and a cell in the shell. The cell has a tab. The shell is provided with a pole. One end of the pole is connected to the tab, and the other end of the pole is connected to an external circuit. In the related art, the pole is usually a riveted structure. The pole specifically includes a base, a column connected to the base, an upper insulating pad, a lower insulating pad, etc. The upper insulating pad is located between the column and the shell, and the lower insulating pad is located between the base and the shell. Riveting holes are provided on the shell, the base, the column, the upper insulating pad, and the lower insulating pad, and an insulating rubber ring is provided in the riveting hole of the shell. The rivet is passed through the corresponding riveting hole of the above components to realize the assembly of the pole on the shell.

[0004] However, the poles of the related art require high precision in the matching of the dimensions of the above-mentioned components during riveting. If there is a deviation in the matching of the dimensions of the components, it will lead to poor air tightness of the battery, short circuit, etc., which leads to high assembly difficulty and production precision requirements. Summary of the invention

[0005] In view of this, the embodiments of the present invention are directed to providing a battery, which can reduce the dimensional matching accuracy during the assembly of the pole to a certain extent and improve the convenience during the assembly of the pole.

[0006] The present invention provides a battery, comprising a shell, a battery cell and a pole;

[0007] The battery core is located in the shell, the battery core includes a first pole ear, and a through hole is opened on the shell wall of the shell;

[0008] The pole comprises a main body and a flange arranged around the main body in a circumferential direction thereof; the main body is inserted into the through hole, and the main body is connected to the first pole lug; the flange is located on the inner side of the shell, and the outer contour of the projection of the flange on the shell wall along the length direction of the shell is located on the periphery of the through hole;

[0009] A sealed connection structure (4) is provided between the pole (3) and the housing (1), the sealed connection structure (4) comprising a metal seal (41) and an insulating seal (42), the insulating seal (42) being provided on the flange (32), the metal seal (41) being sealedly connected to the insulating seal (42), and the metal seal (41) and the housing (1) being welded; the pole (3) and the metal seal (41) are insulated from each other by the insulating seal (42);

[0010] At least a portion of the insulating seal is located between the metal seal and the pole.

[0011] Optionally, the metal seal comprises a first metal sealing portion and a supporting portion;

[0012] The first metal sealing portion is arranged on a side of the flange away from the battery core and is welded to the shell;

[0013] The support portion is disposed around a side of the flange away from the main body portion and is connected to the first metal sealing portion.

[0014] Optionally, the metal seal further includes a second metal sealing portion;

[0015] The second metal sealing portion is disposed on a side of the flange facing the battery core, and the second metal sealing portion is connected to the supporting portion.

[0016] Optionally, along the first direction, a projection length of the first metal sealing portion on the flange is greater than a projection length of the second metal sealing portion on the flange;

[0017] And / or, along the first direction, the length D of the second metal sealing portion satisfies: D>0.15mm;

[0018] And / or, along the second direction, the height L of the support portion satisfies: L>0.3mm;

[0019] and / or, along the second direction, a distance between an end surface of the main body away from the battery core and the first metal sealing portion is not less than 0.05 mm;

[0020] and / or, along the second direction, a distance between an end surface of the main body facing the battery core and the second metal sealing portion is not less than 0.05 mm;

[0021] And / or, the metal seal is a deformable metal sheet, and the first metal sealing portion, the supporting portion and the second metal sealing portion are integrally bent and formed.

[0022] Optionally, the insulating seal comprises a first insulating seal portion, an insulating connection portion, and a second insulating seal portion which are connected in sequence;

[0023] The first insulating sealing portion is located between the flange and the first metal sealing portion, the second insulating sealing portion is located between the flange and the second metal sealing portion, the insulating connecting portion is located between the flange and the supporting portion, and / or

[0024] The insulating seal (42) further includes an insulating extension portion (425);

[0025] The insulating extension portion (425) is located between the hole wall of the through hole (10) and the main body (31), and the insulating extension portion (425) is connected to the first insulating sealing portion (421).

[0026] Optionally, the insulating seal further includes a third insulating sealing portion;

[0027] The third insulating sealing portion is located on a side of the second metal sealing portion facing the battery core, and is connected to the second insulating sealing portion.

[0028] Optionally, the third insulating sealing portion extends to a side of the support portion away from the main body portion;

[0029] And / or, a ratio a of a length of a side of the metal seal facing away from the pole and not covered by the insulating seal to a length of the metal seal satisfies: 0.3≤a≤0.7.

[0030] Optionally, the insulating seal further includes an insulating extension portion;

[0031] The insulating extension portion is located between the hole wall of the through hole and the main body portion, and the insulating extension portion is connected to the first insulating sealing portion.

[0032] Optionally, an end of the insulating extension portion away from the first insulating sealing portion is not lower than an outer wall surface of the shell.

[0033] Optionally, along the second direction, the relationship between the sum h of the thicknesses of the first insulating sealing part and the first metal sealing part, and the distance H between the end surface of the main body away from the battery cell and the side surface of the flange away from the battery cell satisfies: 0.3≤h / H≤0.6.

[0034] Optionally, the first electrode tab is connected to a side of the main body facing the battery core;

[0035] A groove is provided on a side of the main body away from the battery cell, the groove is recessed toward the battery cell, and a projection of the first pole tab on the main body at least partially overlaps with a projection of the groove on the main body.

[0036] Optionally, the main body includes a first sub-main body and a second sub-main body arranged on a side of the first sub-main body away from the battery core, the first sub-main body is connected to the first electrode tab, and the second sub-main body is inserted into the through hole;

[0037] A circuit breaker protection structure is connected between the first sub-main body and the second sub-main body.

[0038] Optionally, the circuit breaker protection structure includes a conductive particle layer and expanded particles doped between conductive particles in the conductive particle layer;

[0039] The conductive particle layer is connected between the first sub-body part and the second sub-body part. The expansion particles expand when the temperature exceeds a preset temperature threshold and / or the current exceeds a preset current threshold, thereby isolating the conductive particle layer to cut off the connection between the first sub-body part and the second sub-body part.

[0040] Optionally, the housing includes a side wall and two main body walls;

[0041] The two main body walls are arranged opposite to each other, the side wall is arranged along the circumference of the main body wall, and the side wall is connected between the two main body walls;

[0042] The through hole is provided on the side wall, or the through hole is provided on the main body wall.

[0043] The battery provided by the present invention comprises a pole including a main body and a flange arranged circumferentially along the main body, the main body is inserted into a through hole, the main body is respectively connected to a first pole ear and an external circuit, the flange is arranged on the inner side of a shell, a sealing connection structure is arranged between the pole and the shell, the sealing connection structure comprises a metal seal and an insulating seal, the metal seal is arranged on the flange and welded to the shell, the pole (3) and the metal seal (41) are insulated by the insulating seal (42); at least part of the insulating seal is located between the metal seal and the pole, so that during assembly, the metal seal is arranged on the flange, and the insulating seal is arranged on the outer side of the shell. When the insulating seal is located between the metal seal and the pole, the pole can be assembled on the shell by directly welding the metal seal to the shell. That is to say, the welding connection between the metal seal and the shell is realized by the metal seal, which is simple and convenient to assemble and reliable. The insulation between the metal seal and the pole is realized by the insulating seal, that is, the insulation between the pole and the shell is realized to avoid short circuit and the like. The sealing between the pole and the shell is realized by the joint action of the metal seal and the insulating seal, which ensures the air tightness of the battery. Compared with the pole with riveted structure, the dimensional matching accuracy is reduced, thereby reducing the manufacturing accuracy and assembly difficulty. At the same time, the metal seal and the insulating seal are fixed to the shell by the flange, which can effectively fix the metal seal and the insulating seal, thereby preventing the metal seal or the insulating seal from shaking left and right to a certain extent, improving the stability of the entire sealing connection structure, and effectively ensuring the stability of the pole assembly and the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of an exploded structure of a battery according to an embodiment of the present invention;

[0045] Figure 2 A partial structural cross-sectional view of a battery according to an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of a pole and a sealed connection structure according to an embodiment of the present invention Figure 1 ;

[0047] Figure 4 for Figure 3 A schematic diagram of the structure of the corresponding second metal sealing portion before being bent;

[0048] Figure 5 A schematic diagram of a pole and a sealed connection structure according to an embodiment of the present invention Figure 2 ;

[0049] Figure 6 A cross-sectional structural diagram of a battery according to an embodiment of the present invention;

[0050] Figure 7 for Figure 6 A schematic diagram of the structure after the corresponding first pole tab is welded to the pole column and the second pole tab is welded to the shell;

[0051] Figure 8 A schematic diagram of a pole and a sealed connection structure according to an embodiment of the present invention Figure 3 ;

[0052] Fig. 9 A schematic diagram of the structure of a battery according to an embodiment of the present invention;

[0053] Fig.10 for Fig. 9 Schematic diagram of the corresponding explosion structure;

[0054] Fig.11 for Fig. 9 Corresponding local structure cross-sectional view.

[0055] Among them, 1. shell; 10. through hole; 11. side wall; 12. main wall; 13. shell body; 14. cover plate; 141. pressure relief groove; 15. injection hole; 16. closure; 2. battery cell; 21. first pole ear; 211. adapter; 22. second pole ear; 3. pole; 31. main body; 301. first sub-main body; 302. second sub-main body; 311. groove; 32. flange; 33. circuit breaker protection structure; 4. sealing connection structure; 41. metal seal; 411. first metal sealing part; 412. support part; 413. second metal sealing part; 42. insulating seal; 421. first insulating sealing part; 422. second insulating sealing part; 423. insulating connection part; 424. third insulating sealing part; 425. insulating extension part. DETAILED DESCRIPTION

[0056] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0057] The battery includes a shell, a battery cell and a pole. The battery cell is located in the shell. The battery cell is provided with a pole ear. The shell is provided with a through hole. The pole is arranged at the through hole. One end of the pole is connected to the pole ear, and the other end of the pole is connected to an external circuit, thereby realizing the transfer of the battery cell.

[0058] Among them, the assembly of the pole must not only consider the insulation between the pole and the shell, but also the sealing between the pole and the shell to ensure the airtightness and safety of the battery. The pole of the related technology adopts a riveted structure. During assembly, the matching accuracy and manufacturing accuracy of the dimensions between the various parts during riveting are required to be high. If there is a deviation in the dimensional matching, it will lead to poor airtightness of the battery or cause a short circuit, etc., resulting in high manufacturing difficulty and assembly accuracy requirements.

[0059] Based on this, the present invention provides a battery, wherein the pole comprises a main body and a flange arranged circumferentially along the main body, the main body is inserted into the through hole, the main body is respectively connected to the first pole ear and the external circuit, the flange is arranged on the inner side of the shell, a sealing connection structure is arranged between the pole and the shell, the sealing connection structure comprises a metal seal and an insulating seal, the metal seal is arranged on the flange and welded to the shell, at least part of the insulating seal is located between the metal seal and the pole, during assembly, the metal seal is arranged on the flange, and the pole (3) and the metal seal (41) are insulated by the insulating seal (42); the insulating seal is located between the metal seal and the pole, and the metal seal is directly welded to the shell to realize the assembly of the pole on the shell, and the insulation and sealing between the pole and the shell are guaranteed. Compared with the pole with a riveted structure, the dimensional matching accuracy is reduced to a certain extent, thereby reducing the difficulty of assembly and manufacturing.

[0060] The battery provided by the present invention is described in detail below with reference to the accompanying drawings through specific embodiments:

[0061] Reference Figures 1 to 11 As shown, this embodiment provides a battery, which may be a lithium-ion battery, for example. The battery may be used as a power source or energy storage unit for electronic devices, and the electronic devices may be, but are not limited to, mobile devices (mobile phones, laptops, tablet computers, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, electric bicycles, etc.).

[0062] The battery of this embodiment specifically includes a shell 1, a battery cell 2 and a pole 3. The shell 1 can be made of metal, such as a steel shell. The battery cell 2 is located in the shell 1, and the battery cell 2 includes a first pole ear 21 and a second pole ear 22, and the polarities of the first pole ear 21 and the second pole ear 22 are different.

[0063] The shell wall of the housing 1 is provided with a through hole 10 . The pole 3 comprises a main body 31 and a flange 32 arranged around the outer periphery of the main body 31 along the circumference of the main body 31 . The main body 31 is passed through the through hole 10 .

[0064] Specifically, the main body 31 is respectively connected to the first pole ear 21 and the external circuit. Exemplarily, the battery may also include a protective plate arranged outside the shell 1, and one end of the main body 31 located inside the shell 1 is connected to the first pole ear 21, and the other end of the main body 31 exposed outside the shell 1 is connected to the protective plate, so that the battery is protected from overcurrent, overtemperature, etc. through the protective plate.

[0065] The flange 32 is located inside the housing 1, and the outer contour of the projection of the flange 32 on the housing wall is located outside the through hole 10. That is, the outer contour size of the flange 32 is larger than the aperture of the through hole 10.

[0066] A sealing connection structure 4 is provided between the pole 3 and the housing 1. The sealing connection structure 4 comprises a metal seal 41 and an insulating seal 42. The metal seal 41 is provided on the flange 32 and is welded to the housing 1. The pole (3) and the metal seal (41) are insulated by the insulating seal (42); at least part of the insulating seal 42 is located between the metal seal 41 and the pole 3.

[0067] During specific assembly, the metal seal 41 can be first set on the flange 32, for example, the metal seal 41 can be connected to the flange 32 by sleeve arrangement or the like, and at the same time, the insulating seal 42 is located between the metal seal 41 and the pole 3, and the metal seal 41 and the pole 3 are separated by the insulating seal 42 to achieve insulation, and then the metal seal 41 is directly welded to the shell 1, so as to achieve the insulating and sealing assembly of the pole 3 on the shell 1.

[0068] That is to say, the welding connection between the metal seal 41 and the shell 1 is achieved, the assembly is simple and convenient, and the connection is reliable. The insulation between the metal seal 41 and the pole 3 is achieved by the insulating seal 42, that is, the insulation between the pole 3 and the shell 1 is achieved to avoid short circuits and the like. The sealing between the pole 3 and the shell 1 is achieved by the joint action of the metal seal 41 and the insulating seal 42, thereby ensuring the airtightness of the battery. Compared with the pole 3 with a riveted structure, the dimensional matching accuracy is reduced, thereby reducing the manufacturing accuracy and assembly difficulty.

[0069] Exemplarily, the metal seal 41 may be a metal sheet, such as a steel sheet.

[0070] In a specific implementation, the second pole tab 22 may be connected to the housing 1. For example, the first pole tab 21 may be a positive pole tab, and the pole column 3 may be a positive pole column. The second pole tab 22 may be a negative pole tab.

[0071] In addition, the housing 1 is provided with a liquid injection hole 15, through which electrolyte is injected into the housing 1. The liquid injection hole 15 is provided with a sealing member 16, and the liquid injection hole 15 is sealed by the sealing member 16 after the liquid injection is completed.

[0072] Reference Figure 1 , Fig. 9 and Fig.10 As shown, the housing 1 specifically includes: a side wall 11 and two main body walls 12 . The two main body walls 12 are arranged opposite to each other, the side wall 11 is arranged along the circumference of the main body wall 12 , and the side wall 11 is connected between the two main body walls 12 .

[0073] Reference Figure 1 As shown, in a feasible implementation, the through hole 10 is specifically opened on the side wall 11 .

[0074] Reference Figures 9 to 11 As shown, in another feasible implementation, the through hole 10 is specifically opened on the main body wall 12. Exemplarily, the main body wall 12 may include a main body area and a recessed area located on one side of the main body area, and the through hole 10 may be specifically opened in the recessed area.

[0075] Continue to refer to Fig.11 As shown, illustratively, when the through hole 10 is provided on the main body wall 12 , the connection between the first pole tab 21 and the main body 31 can be achieved specifically through the adapter sheet 211 .

[0076] The battery provided by the present invention is provided with a pole 3 including a main body 31 and a flange 32 arranged along the circumference of the main body 31, the main body 31 is inserted into the through hole 10, the main body 31 is respectively connected to the first pole ear 21 and the external circuit, the flange 32 is arranged on the inner side of the shell 1, a sealing connection structure 4 is arranged between the pole 3 and the shell 1, the sealing connection structure 4 includes a metal seal 41 and an insulating seal 42, the metal seal 41 is arranged on the flange 32, and is welded to the shell 1, so that at least part of the insulating seal 42 is located between the metal seal 41 and the pole 3, so that during assembly, the metal seal 41 is arranged on the flange 32, and the insulating seal 42 is arranged on the flange 32. It is located between the metal seal 41 and the pole 3, and then the metal seal 41 is directly welded to the shell 1 to realize the assembly of the pole 3 on the shell 1, that is, the welding connection between the metal seal 41 and the shell 1 is realized, the assembly is simple and convenient, and the connection is reliable, and the insulation between the metal seal 41 and the pole 3 is realized by the insulating seal 42, that is, the insulation between the pole 3 and the shell 1 is realized to avoid the occurrence of short circuits and the like, and the sealing between the pole 3 and the shell 1 is realized by the joint action of the metal seal 41 and the insulating seal 42, thereby ensuring the airtightness of the battery; compared with the pole with a riveted structure, the dimensional matching accuracy is reduced, thereby reducing the manufacturing accuracy and assembly difficulty.

[0077] At the same time, the metal seal 41 and the insulating seal 42 are fixed to the shell 1 through the flange 32, which can effectively fix the metal seal 41 and the insulating seal 42, thereby preventing the metal seal 41 or the insulating seal 42 from shaking left and right to a certain extent, thereby improving the stability of the entire sealing connection structure 4, and effectively ensuring the stability of the pole 3 assembly and the sealing effect.

[0078] Reference Figures 2 to 7 As shown, in some embodiments, the metal seal 41 specifically includes: a first metal seal portion 411 and a support portion 412. The first metal seal portion 411 is disposed on a side of the flange 32 away from the battery cell 2 and is welded to the housing 1. The support portion 412 is disposed on a side of the flange 32 away from the main body 31 and is connected to the first metal seal portion 411.

[0079] Specifically, the first metal sealing part 411 and the supporting part 412 can both be annular structures, and the supporting part 412 is sleeved on the outer periphery of the flange 32. At this time, the first metal sealing part 411 is covered on the side of the flange 32 away from the battery core 2, thereby achieving the fixation between the metal seal 41 and the pole 3. Then the first metal sealing part 411 is welded to the housing 1.

[0080] For example, the metal seal 41 may be disposed on the flange 32 along the circumference of the flange 32 .

[0081] Furthermore, the metal seal 41 further includes a second metal seal portion 413 . The second metal seal portion 413 is disposed on a side of the flange 32 facing the battery cell 2 . The second metal seal portion 413 is connected to the support portion 412 .

[0082] By providing the second metal sealing portion 413, the cross-section of the metal seal 41 is roughly C-shaped, thereby improving the structural strength of the metal seal 41. In this way, the metal seal 41 can be wrapped and clamped on the flange 32, thereby improving the stability of the connection between the metal seal 41 and the flange 32 and further improving the convenience of assembling the metal seal 41.

[0083] Combination Figure 2 and Figure 5 As shown, in some embodiments, along the first direction, the projected length of the first metal sealing portion 411 on the flange 32 is greater than the projected length of the second metal sealing portion 413 on the flange 32 .

[0084] The first direction here can be specifically Figure 2 and Figure 5 The X direction in the figure may be, for example, the width direction of the battery.

[0085] This arrangement further ensures that the first metal sealing portion 411 has a sufficient length to be smoothly welded with the shell wall of the shell 1, avoiding the occurrence of cold welding, leaking welding, etc., further improving the sealing effect between the first metal sealing portion 411 and the shell 1, thereby ensuring the sealing of the entire battery and improving the safety of the battery. At the same time, this arrangement prevents the second metal sealing portion 413 from contacting the main body 31, avoiding the occurrence of short circuits, etc.

[0086] Continue to refer to Figure 5 As shown, in some embodiments, along the first direction, the length D of the second metal sealing portion 413 satisfies: D>0.15mm. At the same time, the length of the second metal sealing portion 413 is less than the length of the flange 32 along the X direction, mainly considering that the polarities of the second metal sealing portion 413 and the flange 32 are different. If the lengths of the two are equal, the thickness of the insulating sealing sheet is too thin, which causes the second metal sealing portion 413 and the flange 32 to contact and cause a short circuit.

[0087] The first direction here is specifically Figure 5 The X direction in the figure may be, for example, the width direction of the battery.

[0088] Exemplarily, the length D may be 0.152 mm, 0.155 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, or 0.20 mm.

[0089] Such a configuration can further increase the covering area of ​​the pole 3 by the metal seal 41. The longer the length of the second metal seal 413, the larger the area of ​​the flange covered by the second metal seal, and thus the larger the bonding area between the second metal seal 413 and the flange, so as to increase the bonding force between the second metal seal 413 and the flange, and prevent the risk of the second metal seal 413 easily falling off the flange under the pressure of high-temperature gas during thermal runaway in the shell, thereby improving the connection stability and sealing effect between the pole 3, the metal seal 41 and the shell 1.

[0090] Continue to refer to Figure 5 As shown, in some embodiments, along the second direction, the height L of the support portion 412 satisfies: L>0.3 mm.

[0091] The second direction here can be specifically Figure 5 The Y direction in the figure may be, for example, the height direction of the battery.

[0092] Exemplarily, the height L may be, for example, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, or 0.4 mm.

[0093] In this way, the height of the support part 412 is set to be greater than 0.3 mm, thereby ensuring the bonding area between the side of the flange and the support part 412, ensuring that the support part 412 is not easy to fall off the flange in the case of thermal runaway, and further dispersing the stress on the first metal sealing part 411, and to a certain extent ensuring the support strength of the support part 412 to the first metal sealing part 411, thereby improving the structural strength of the metal seal 41, improving the reliability of the welding between the first metal sealing part 411 and the shell 1, and improving the reliability of the connection between the metal seal 41 and the flange 32, thereby improving the sealing of the battery. In addition, the height of the support part 412 is less than the overall thickness of the pole, so as to avoid occupying too much shell space and affecting the energy density.

[0094] Reference Figure 5 As shown, in some embodiments, along the second direction, a distance F between an end surface of the main body 31 away from the battery core 2 and the first metal sealing portion 411 is not less than 0.05 mm.

[0095] The second direction here can be specifically Figure 5 The Y direction in the figure may be, for example, the height direction of the battery. For example, the distance F may be, for example, 0.052 mm, 0.054 mm, 0.055 mm, 0.06 mm, 0.07 mm, or 0.08 mm.

[0096] Such an arrangement ensures the protruding height of the main body 31 relative to the first metal sealing portion 411 , making it more convenient to connect the main body 31 to an external circuit.

[0097] In some embodiments, along the second direction, a distance E between an end surface of the main body 31 facing the battery cell 2 and the second metal sealing portion 413 is not less than 0.05 mm.

[0098] The second direction here can be specifically Figure 5 The Y direction in the figure may be, for example, the height direction of the battery. For example, the distance E may be, for example, 0.052 mm, 0.054 mm, 0.055 mm, 0.06 mm, 0.07 mm, or 0.08 mm.

[0099] Such an arrangement ensures the protruding height of the main body 31 relative to the second metal sealing portion 413 , making it more convenient to connect the main body 31 with the first electrode tab 21 .

[0100] In some embodiments, the metal seal 41 is a deformable metal sheet, and the first metal seal portion 411 , the support portion 412 , and the second metal seal portion 413 are integrally bent and formed.

[0101] This further reduces the difficulty of manufacturing and improves the convenience of manufacturing and assembly.

[0102] Combination Figure 3 and Figure 4 As shown, specifically, one end of the metal seal 41 may be bent to form a first metal seal portion 411 , and then the other end of the metal seal 41 may be bent to form a second metal seal portion 413 .

[0103] Reference Figures 2 to 5 As shown, in some embodiments, the insulating seal 42 includes a first insulating seal portion 421 , a second insulating seal portion 422 , and an insulating connection portion 423 which are connected in sequence.

[0104] The first insulating sealing portion 421 is located between the flange 32 and the first metal sealing portion 411 , the second insulating sealing portion 422 is located between the flange 32 and the second metal sealing portion 413 , and the insulating connecting portion 423 is located between the flange 32 and the supporting portion 412 .

[0105] Such an arrangement further ensures the coverage area of ​​the insulating seal 42 on the metal seal 41 , ensures good insulation between the metal seal 41 and the pole 3 , and further ensures insulation between the pole 3 and the housing 1 .

[0106] Further, continue to refer to Figures 2 to 5 In some embodiments, the insulating seal 42 further includes a third insulating seal portion 424 . The third insulating seal portion 424 is located on a side of the second metal seal portion 413 facing the battery cell 2 , and is connected to the second insulating seal portion 422 .

[0107] This arrangement can effectively prevent the second metal sealing part 413 from contacting the pole piece of the battery cell 2 and causing a short circuit, and further increases the coverage area of ​​the insulating seal 42, further improving the insulation effect and the structural stability of the entire sealing connection structure 4.

[0108] Moreover, such an arrangement enables the insulating seal 42 to be sleeved on the outside of the metal seal 41, referring to Figure 3 or Figure 5 The insulating seal 42 avoids the position where the metal seal 41 is connected to the shell 1 to ensure effective welding of the metal seal 41 and the shell 1.

[0109] For example, during specific assembly, the metal seal 41 can be first covered by the insulating seal 42, and then the whole is bent as mentioned above, so that the whole is covered on the flange 32, and then the metal seal 41 is welded to the shell 1 to achieve the sealing and insulating assembly of the pole 3 and the shell 1, which further improves the convenience of assembly and ensures the airtightness of the battery.

[0110] Further, refer to Figure 3As shown, in some embodiments, the third insulating sealing portion 424 extends to a side of the support portion 412 that is away from the main body portion 31 .

[0111] This arrangement further increases the covering area of ​​the insulating seal 42 on the metal seal 41, and while improving the insulation effect, further improves the structural strength of the entire sealing connection structure 4. It can also prevent the support portion 412 from contacting other components located on its periphery and causing a short circuit.

[0112] In a specific implementation, the insulating seal 42 can be made of elastic materials such as silicone parts and rubber parts that can be bent and deformed, so as to further improve the insulation and sealing effects.

[0113] Reference Figures 2 to 5 As shown, in some embodiments, the ratio a of the length of the side of the metal seal 41 facing away from the pole 3 and not covered by the insulating seal 42 to the length of the metal seal 41 satisfies: 0.3≤a≤0.7.

[0114] Exemplarily, the ratio a may be, for example, 0.3, 0.4, 0.45, 0.5, 0.55, 0.6, or 0.7.

[0115] The length of the metal seal 41 here may specifically be the total length of the metal seal 41 after it is unfolded, or specifically may be the total length of the metal seal 41 before it is bent.

[0116] If the ratio a is too small, it will easily affect the welding between the metal seal 41 and the shell 1. If it is too large, it will cause the metal seal 41 to contact with other components such as the battery cell and cause a short circuit. Therefore, by setting the ratio a within the above range, such a setting can reserve a sufficient welding area, that is, ensure the welding area of ​​the metal seal 41, and then ensure the smooth welding and connection stability of the metal seal 41 and the shell 1. At the same time, it prevents the metal seal 41 from contacting with the pole piece of the battery cell 2 and causing a short circuit. Moreover, such a setting also ensures the bending resistance of the metal seal 41 and prevents the metal seal 41 from breaking.

[0117] Continue to refer to Figures 2 to 5 As shown, in some embodiments, the insulating seal 42 further includes an insulating extension portion 425 , wherein the insulating extension portion 425 is located between the hole wall of the through hole 10 and the main body portion 31 , and the insulating extension portion 425 is connected to the first insulating seal portion 421 .

[0118] Such a configuration can further prevent the main body 31 of the pole 3 from contacting the hole wall of the through hole 10 and causing a short circuit, thereby further improving the insulation effect. Moreover, by locating the insulating extension 425 between the hole wall of the housing 1 and the main body 31, it is possible to effectively isolate the entry of external water vapor, etc. At the same time, such a configuration can further effectively ensure the sealing of the housing 1 after hot pressing and overflowing glue.

[0119] Furthermore, one end of the insulating extension portion 425 away from the first insulating sealing portion 421 is not lower than the outer wall surface of the housing 1. In other words, one end of the insulating extension portion 425 away from the first insulating sealing portion 421 is flush with the outer wall surface of the housing 1 or protrudes from the outer wall surface of the housing 1.

[0120] This arrangement further ensures the insulation between the main body 31 and the shell 1, and improves the safety of the battery.

[0121] In specific implementation, the first insulating sealing portion 421, the second insulating sealing portion 422, the third insulating sealing portion 424, the insulating connecting portion 423 and the insulating extending portion 425 can be integrally formed, which further improves the structural strength of the entire insulating sealing member 42 and further improves the convenience of assembly.

[0122] Continue to refer to Figure 5 As shown, in some embodiments, along the second direction ( Figure 5 In the Y direction (specifically, the height direction of the battery), the relationship between the sum of the thicknesses h of the first insulating sealing portion 421 and the first metal sealing portion 411, and the distance H between the end surface of the main body 31 away from the battery cell 2 and the side surface of the flange 32 away from the battery cell 2 satisfies: 0.3≤h / H≤0.6.

[0123] Exemplarily, the ratio may be, for example, 0.3, 0.4, 0.45, 0.5, 0.55, or 0.6.

[0124] If the ratio of h / H is too small, that is, the thickness of the metal sealing part and the first insulating sealing part is relatively small, so that when the battery cell is shaken left and right, the bonding force between the pole and the metal sealing part is insufficient, resulting in the shaking of the pole, which not only affects the insulating sealing of the insulating seal 42, but also easily causes a short circuit between the pole and the shell; if the ratio of h / H is too large, that is, the thickness of the metal sealing part and the first insulating sealing part is relatively thick, the welding of the metal sealing part and the shell requires greater power and greater energy, which easily leads to the risk of welding leakage or welding failure between the metal sealing part and the shell, thereby affecting the welding between the metal seal 41 and the shell 1. By setting the ratio of h / H within the above range, not only the insulating sealing of the insulating seal 42 is guaranteed, but also the reliable welding between the metal seal 41 and the shell 1 is guaranteed.

[0125] In some embodiments, the first electrode tab 21 is connected to a side of the main body 31 facing the battery cell 2. Figure 7 As shown, the first electrode tab 21 can be specifically connected to the main body 31 by welding. Figure 7 The black block shown in FIG. 1 is specifically a weld mark.

[0126] Combination Figure 2 and Figure 5 As shown, a groove 311 can be provided on the side of the main body 31 away from the battery cell 2 , the groove 311 is recessed toward the battery cell 2 , and the projection of the first pole tab 21 on the main body 31 at least partially overlaps with the projection of the groove 311 on the main body 31 .

[0127] That is, by thinning the main body 31, it is convenient to weld the main body 31 and the first pole tab 21 from the outside of the housing 1, and the welding effect is guaranteed. Specifically, the main body 31 and the first pole tab 21 can be laser welded, and the laser welding device enters the groove 311 to weld the bottom of the groove 311 and the first pole tab 21 together.

[0128] Moreover, this arrangement also makes it easy to confirm the weld to prevent welding leaks or cold welds.

[0129] Reference Figure 8 As shown, in some embodiments, the main body 31 includes a first sub-main body 301 and a second sub-main body 302 disposed on a side of the first sub-main body 301 away from the battery cell 2. Figure 8 As shown, the second sub-body portion 302 is located below the first sub-body portion 301 .

[0130] The first sub-body portion 301 is connected to the first pole tab 21, and the second sub-body portion 302 is disposed in the through hole 10. The second sub-body portion 302 is used to connect to an external circuit, such as a protection board.

[0131] A circuit breaker protection structure 33 may be connected between the first sub-body portion 301 and the second sub-body portion 302 .

[0132] In this way, when the current of the battery exceeds the preset current threshold, or when the temperature of the battery exceeds the preset temperature threshold, the circuit-breaking protection structure 33 will disconnect the first sub-main body 301 and the second sub-main body 302, that is, cut off the first pole ear 21 and the external circuit, thereby cutting off the connection between the battery cell 2 and the external circuit, playing a protective role against overcurrent, overtemperature, etc., and improving the safety of the battery.

[0133] In a specific implementation, the short circuit protection structure 33 may specifically include: a conductive particle layer and expanded particles doped between the conductive particles in the conductive particle layer.

[0134] In which, the conductive particle layer is connected between the first sub-main body 301 and the second sub-main body 302, and the expansion particles expand when the temperature exceeds (greater than or equal to) a preset temperature threshold, and / or expand when the current exceeds (greater than or equal to) a preset current threshold, thereby isolating the conductive particle layer to cut off the connection between the first sub-main body 301 and the second sub-main body 302.

[0135] Taking the conductive particles including graphite particles and the expanded particles including polyurethane particles as an example, when the temperature is greater than or equal to the preset temperature threshold, or the current is greater than or equal to the preset current threshold, the polyurethane particles themselves expand, cutting off the graphite chains, thereby disconnecting the internal and external conductive channels, thereby playing a protective role against overcurrent, overtemperature, etc.

[0136] The above-mentioned preset temperature threshold and preset current threshold can be set according to actual conditions.

[0137] Of course, in other implementations, the conductive particles may also be metal conductive particles, carbon black conductive particles, graphene conductive particles, etc. The expanded particles may also be polystyrene particles, polyamide particles, etc.

[0138] Reference Figure 1 As shown, in some embodiments, the housing 1 includes a housing body 13 and a cover plate 14 covering the housing body 13 , and a pressure relief groove 141 is provided on an outer wall of the cover plate 14 .

[0139] Since the thickness of the cover plate 14 at the pressure relief groove 141 is relatively thin, when the pressure in the shell 1 is too high, the pressure relief groove 141 will crack under the gas pressure, thereby relieving pressure and avoiding unsafe accidents such as explosion caused by excessive pressure in the shell 1.

[0140] Specifically, the depth of the pressure relief groove 141 may be set to be no less than 1 / 2 of the thickness of the cover plate 14 .

[0141] This further ensures that the bottom thickness of the pressure relief groove 141 is not too thick, and ensures that the pressure relief groove 141 can be smoothly split to achieve timely pressure relief when the gas in the shell 1 is too large, thereby further improving the safety of the battery.

[0142] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or it can be indirectly connected through an intermediate medium, 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. In addition, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0143] In this article, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0144] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: It comprises a housing (1), a battery cell (2) and a pole (3); The battery core (2) is located in the shell (1), the battery core (2) comprises a first pole ear (21), and a through hole (10) is provided on the shell wall of the shell (1); The pole (3) comprises a main body (31) and a flange (32) arranged around the main body (31) along the circumference of the main body (31); the main body (31) is inserted into the through hole (10), and the main body (31) is connected to the first pole lug (21); the flange (32) is located on the inner side of the shell (1), and the outer contour of the projection of the flange (32) on the shell wall along the length direction of the shell is located on the periphery of the through hole (10); A sealed connection structure (4) is provided between the pole (3) and the housing (1), the sealed connection structure (4) comprising a metal seal (41) and an insulating seal (42), the insulating seal (42) being provided on the flange (32), the metal seal (41) being sealedly connected to the insulating seal (42), and the metal seal (41) and the housing (1) being welded; the pole (3) and the metal seal (41) are insulated from each other by the insulating seal (42); At least part of the insulating seal (42) is located between the metal seal (41) and the pole (3).

2. The battery according to claim 1, characterized in that The metal sealing member (41) comprises a first metal sealing portion (411) and a supporting portion (412); The first metal sealing portion (411) is arranged on a side of the flange (32) away from the battery core (2) and is welded to the housing (1); The support portion (412) is disposed around a side of the flange (32) away from the main body portion (31), and is connected to the first metal sealing portion (411).

3. The battery according to claim 2, characterized in that The metal seal (41) further comprises a second metal seal portion (413); The second metal sealing portion (413) is arranged on a side of the flange (32) facing the battery core (2), and the second metal sealing portion (413) is connected to the supporting portion (412).

4. The battery according to claim 3, characterized in that Along the first direction, the projection length of the first metal sealing portion (411) on the flange (32) is greater than the projection length of the second metal sealing portion (413) on the flange (32); And / or, along the first direction, the length D of the second metal sealing portion (413) satisfies: D>0.15mm; And / or, along the second direction, the height L of the support portion (412) satisfies: L>0.3mm; and / or, along the second direction, a distance F between an end surface of the main body (31) away from the battery core (2) and the first metal sealing portion (411) is not less than 0.05 mm; and / or, along the second direction, a distance E between an end surface of the main body (31) facing the battery core (2) and the second metal sealing portion (413) is not less than 0.05 mm; And / or, the metal sealing member (41) is a deformable metal sheet, and the first metal sealing portion (411), the supporting portion (412) and the second metal sealing portion (413) are integrally bent and formed.

5. The battery according to claim 3, characterized in that The insulating seal (42) comprises a first insulating seal portion (421), an insulating connection portion (423) and a second insulating seal portion (422) which are connected in sequence; The first insulating sealing portion (421) is located between the flange (32) and the first metal sealing portion (411), the second insulating sealing portion (422) is located between the flange (32) and the second metal sealing portion (413), the insulating connecting portion (423) is located between the flange (32) and the supporting portion (412), and / or The insulating seal (42) further includes an insulating extension portion (425); The insulating extension portion (425) is located between the hole wall of the through hole (10) and the main body (31), and the insulating extension portion (425) is connected to the first insulating sealing portion (421).

6. The battery according to claim 5, characterized in that The insulating seal (42) further includes a third insulating seal portion (424); The third insulating sealing portion (424) is located on a side of the second metal sealing portion (413) facing the battery core (2), and is connected to the second insulating sealing portion (422).

7. The battery according to claim 6, characterized in that The third insulating sealing portion (424) extends to a side of the support portion (412) away from the main body portion (31); And / or, a ratio a of a length of a side of the metal seal (41) facing away from the pole (3) that is not covered by the insulating seal (42) to a length of the metal seal (41) satisfies: 0.3≤a≤0.

7.

8. The battery according to claim 5, characterized in that Along the second direction, the relationship between the sum h of the thicknesses of the first insulating sealing portion (421) and the first metal sealing portion (411), and the distance H between the end surface of the main body (31) away from the battery cell (2) and the side surface of the flange (32) away from the battery cell (2) satisfies: 0.3≤h / H≤0.

6.

9. The battery according to any one of claims 1 to 8, characterized in that: The first pole lug (21) is connected to a side of the main body (31) facing the battery core (2); A groove (311) is provided on a side of the main body (31) facing away from the battery cell (2), the groove (311) being recessed in the direction of the battery cell (2), and a projection of the first pole lug (21) on the main body (31) at least partially overlaps with a projection of the groove (311) on the main body (31).

10. The battery according to any one of claims 1 to 8, characterized in that: The main body (31) comprises a first sub-main body (301) and a second sub-main body (302) arranged on a side of the first sub-main body (301) away from the battery core (2), the first sub-main body (301) being connected to the first pole lug (21), and the second sub-main body (302) being inserted into the through hole (10); A circuit breaker protection structure (33) is connected between the first sub-main body (301) and the second sub-main body (302).

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