Battery cover plate assembly, battery pack and electric equipment

Abstract

The utility model discloses a battery cover plate assembly, a battery pack and electric equipment, the battery cover plate assembly comprises an end cover, a pole and an insulation sealing piece, and the end cover is provided with an accommodating part; the pole is arranged in the accommodating part, and a gap is formed between the pole and the accommodating part; and the insulating sealing element is heated to be softened, so that the insulating sealing element is switched between a solid phase state and a liquid phase state. The insulating sealing element is arranged in the gap to connect the pole and the end cover, and the pole and the end cover are insulated from each other. According to the battery cover plate assembly, the cover plate and the pole are fixed into a whole through the insulation sealing part, and meanwhile, the insulation sealing part enables the cover plate and the pole to be in insulation sealing fit, that is, the cover plate and the pole are insulated from each other, and a gap between the cover plate and the pole is completely filled with the insulation sealing part, so that the structural complexity of the battery cover plate assembly can be greatly reduced; and the cover plate and the pole are prevented from being connected together by adopting a riveting process, so that the production cost is reduced.

Description

Technical Field

[0001] The utility model generally relates to the technical field of batteries, and in particular to a battery cover assembly, a battery pack and electrical equipment. Background Art

[0002] With the rapid development of battery technology, today's batteries have the characteristics of high capacity and high safety, and are widely used in fields such as automobiles, aerospace, and consumer electronics.

[0003] In order to achieve PACK welding on the same side of the battery, cylindrical batteries with steel or aluminum shell structures in the industry currently use a pole riveting method, using a pole structure composed of an insulating ring and a sealing ring to achieve insulation of the positive and negative poles of the battery or overall sealing of the battery. This pole riveting structure requires many parts and has a complicated assembly process, resulting in high production costs. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a battery cover assembly, a battery pack and an electrical device.

[0005] In a first aspect, the present application provides a battery cover assembly, comprising an end cover, a pole and an insulating seal.

[0006] The end cover is provided with a receiving portion. The pole is arranged in the receiving portion, and a gap exists between the pole and the receiving portion. The insulating seal is softened by heat, so that the insulating seal switches between a solid phase and a liquid phase. The insulating seal is arranged in the gap to connect the pole and the end cover, and the pole and the end cover are insulated from each other.

[0007] In one embodiment, the end cap has a first end face and a second end face that are oppositely disposed, and the pole has a third end face and a fourth end face that are oppositely disposed, the third end face and the first end face are disposed on the same side, and the fourth end face and the second end face are disposed on the same side,

[0008] The insulating seal comprises a first stopper and a second stopper, wherein the first stopper cooperates with the first end surface and the third end surface, and the second stopper cooperates with the second end surface and the fourth end surface.

[0009] In one embodiment, the first stopper and the second stopper are both in a ring shape, and the radial size of the first stopper and the second stopper closer to the battery cell is greater than the radial size of the first stopper and the second stopper farther from the battery cell.

[0010] In one embodiment, the end cover is provided with a first matching portion, the insulating seal is provided with a first matching connection portion, the first matching connection portion matches with the first matching portion to connect the end cover and the insulating seal to each other, or / and,

[0011] The pole is provided with a second matching portion, and the insulating seal is provided with a second matching connecting portion, and the second matching connecting portion matches with the second matching portion so that the pole and the insulating seal are connected to each other.

[0012] In one embodiment, the first mating portion and the first mating connection portion are insert-fitted, or / and, the second mating portion and the second mating connection portion are insert-fitted.

[0013] In one embodiment, the end cover is provided with a first protrusion extending toward the pole, the first protrusion is the first matching portion, the insulating seal is provided with a first embedding slot that is inserted and matched with the first protrusion, the first embedding slot is the first matching connection portion; or / and,

[0014] The pole is provided with a second protrusion extending toward the end cover, the second protrusion is the second matching portion, and the insulating seal is provided with a second embedding slot that is inserted and matched with the second protrusion, the second embedding slot is the second matching connection portion.

[0015] In one embodiment, a thinned portion is provided on the pole, and the thickness of the thinned portion is smaller than the thickness of the pole.

[0016] In one embodiment, the thinned portion is used to connect with the current collecting plate, and the surface of the pole facing away from or toward the current collecting plate is sunken to form a groove, and the bottom of the groove is the thinned portion.

[0017] In one embodiment, a liquid injection hole is provided at the bottom of the groove, and the liquid injection hole is sealed with the liquid injection plug.

[0018] In one embodiment, the insulating seal is in the solid state at a first preset temperature, which is between 100°C and 120°C; the insulating seal is in the liquid state at a second preset temperature, which is between 140°C and 160°C.

[0019] In a second aspect, an embodiment of the present application provides a battery pack, comprising a battery cell and the battery end cover assembly of the first aspect, wherein the battery pack is a cylindrical battery.

[0020] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery pack in the second aspect.

[0021] In summary, the present application provides a battery cover assembly, a battery pack and an electrical device, wherein the gap between the pole and the end cover is filled with an insulating seal, and the solidified insulating seal connects the pole and the end cover together, and the insulating seal completely fills the above gap, so that the insulating seal and the pole are sealed and matched, and there is no gap between the two; the insulating seal and the end cover are sealed and matched, and there is no gap between the two. At the same time, since the insulating seal has an insulating property, the pole and the end cover can be insulated from each other. In addition, the insulating seal softens due to heat, so that the insulating seal switches between the solid phase and the liquid phase. When the battery pack fails, a large amount of gas and heat are generated inside the battery pack. The heat is transferred to the cover assembly, and the insulating seal gradually softens or deforms due to heat, so that the seal between the insulating seal and the end cover fails, and there is a first gap between the two; the seal between the insulating seal and the pole fails, and there is a second gap between the two, so that a large amount of gas and heat are released or discharged from the first gap and the second gap to the external environment, thereby avoiding safety problems in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 An exploded view of the battery cover assembly provided in the first embodiment;

[0024] Figure 2 A cross-sectional view of a battery cover assembly provided in the first embodiment;

[0025] Figure 3 A cross-sectional view of a pole provided in the first embodiment;

[0026] Figure 4 A three-dimensional diagram of a pole provided in the first embodiment;

[0027] Figure 5 A top view of the insulating seal provided in the first embodiment;

[0028] Figure 6 An exploded view of a battery cover assembly provided in a second embodiment;

[0029] Figure 7 A cross-sectional view of a battery cover assembly provided in a second embodiment;

[0030] Figure 8 A cross-sectional view of a pole provided in a second embodiment;

[0031] Fig. 9 A perspective view of a pole provided in a second embodiment;

[0032] Fig.10 A top view of an insulating seal provided in a second embodiment;

[0033] Fig.11 An exploded view of a battery cover assembly provided in a third embodiment;

[0034] Fig.12 is a cross-sectional view of a battery cover assembly provided in a third embodiment;

[0035] Fig.13 A cross-sectional view of a pole provided in a third embodiment;

[0036] Fig.14 A three-dimensional diagram of a pole provided in a third embodiment;

[0037] Fig.15 A top view of an insulating seal provided in a third embodiment;

[0038] Fig.16 is a cross-sectional view of a battery cover assembly provided in a fourth embodiment;

[0039] Fig.17 is a cross-sectional view of a battery cover assembly provided in a fifth embodiment;

[0040] Fig.18 A three-dimensional diagram of a current collecting plate provided in an embodiment;

[0041] Reference numerals:

[0042] End cover 10, first end surface 101, second end surface 102, receiving portion 11, first protrusion 12, third embedding slot 13;

[0043] The pole 20, the third end face 201, the fourth end face 202, the groove 21, the first stepped groove 211, the second stepped groove 212, the injection hole 22, the second protrusion 23, and the third protrusion 24;

[0044] Insulating seal 30, first stopper 31, second stopper 32, connecting portion 33, first embedding slot 34, second embedding slot 35, fourth protrusion 36;

[0045] Liquid injection plug 40 , sealing cover 50 , current collecting plate 60 , shell 70 , and battery cell 80 . DETAILED DESCRIPTION

[0046] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] like Figure 1-Figure 18 As shown, a first aspect of this embodiment provides a battery cover assembly, including: an end cover 10 , a pole 20 and an insulating seal 30 .

[0049] The end cover 10 is provided with a receiving portion 11 . The pole 20 is disposed in the receiving portion 11 , and there is a gap between the pole 20 and the receiving portion 11 .

[0050] The insulating seal 30 has a solid phase and a liquid phase, and can switch between the solid phase and the liquid phase. The insulating seal 30 is disposed in the gap to connect the pole 20 and the end cover 10, and the pole 20 and the end cover 10 are insulated from each other.

[0051] It should be noted that, in practical applications, the battery pack includes a cover assembly, a shell 70 and a battery cell 80. The shell 70 has a cavity, the battery cell 80 is disposed in the cavity, the cover assembly covers the opening of the cavity, and the cover assembly is sealed with the above-mentioned opening.

[0052] In the related art, the cover plate assembly includes an end cap 10, a pole 20 and a sealing ring, wherein the end cap 10, the sealing ring and the pole 20 are connected together by riveting. However, the above method makes the processing technology of the cover plate assembly complicated and the production cost high.

[0053] Based on this, the first aspect of the present embodiment provides a battery cover assembly, including an end cap 10, a pole 20 and an insulating seal 30. The insulating seal 30 has a solid phase and a liquid phase, and the insulating seal 30 can switch between the solid phase and the liquid phase. For example, the insulating seal 30 can be a PC material, the insulating seal 30 can be a PP material, the insulating seal 30 can be a PVC material, the insulating seal 30 can be a PE material, the insulating seal 30 can be a PET material, ..., which are not listed one by one in this embodiment.

[0054] Among them, the injection molding process can be used to fill the gap between the pole 20 and the end cover 10 with the insulating seal 30. The solidified insulating seal 30 connects the pole 20 and the end cover 10 together. The insulating seal 30 completely fills the above gap, so that the insulating seal 30 and the pole 20 are sealed and matched, and there is no gap between the two; so that the insulating seal 30 and the end cover 10 are sealed and matched, and there is no gap between the two. At the same time, since the insulating seal 30 has an insulating property, the pole 20 and the end cover 10 can be insulated from each other.

[0055] In addition, in actual applications, a large amount of gas and heat will be generated inside the battery cell 80 due to a fault, and the large amount of gas and heat cannot be diffused or discharged to the external environment in time, which will cause the battery pack to explode and cause safety problems in the battery pack.

[0056] Based on this, the battery pack is provided with an explosion-proof valve to avoid safety problems with the battery pack. The explosion-proof valve is provided on the end cover 10 assembly of the battery pack, and the explosion-proof valve is connected to the interior of the battery pack. When a battery pack fails, a large amount of gas and heat is generated inside the battery pack. At this moment, the explosion-proof valve is opened. The explosion-proof valve diffuses or discharges the gas and heat to the external environment as soon as possible, thereby avoiding safety problems with the battery pack. Among them, after the explosion-proof valve is opened, the explosion-proof valve is equivalent to connecting the interior of the battery pack with the external environment.

[0057] However, this embodiment does not require an explosion-proof valve and can diffuse or discharge the gas and heat to the external environment immediately, thereby avoiding safety problems with the battery pack.

[0058] Specifically: Figure 1 and Figure 2 As shown, the insulating seal 30 is in a solid state at a temperature below 120° C. (including 120° C.), which is the first preset temperature mentioned above. The insulating seal 30 is in a liquid state at a temperature below 150° C. (including 150° C.), which is the second preset temperature mentioned above.

[0059] When a battery pack fails, a large amount of gas and heat are generated inside the battery pack. The heat is transferred to the cover assembly, causing the temperature of the cover assembly to gradually increase, which can exceed 120°C until it reaches the maximum temperature of the cover assembly of 135°C. When the temperature of the cover assembly exceeds 120°C, the insulating seal 30 is gradually softened or deformed by the heat, causing the seal between the insulating seal 30 and the end cover 10 to fail, and a first gap exists between the two; causing the seal between the insulating seal 30 and the pole 20 to fail, and a second gap exists between the two. As the temperature of the cover assembly reaches 135°C, the sizes of the first gap and the second gap mentioned above gradually increase, so that a large amount of gas and heat are released or discharged from the first gap and the second gap to the external environment, thereby avoiding safety problems in the battery pack.

[0060] In summary, in this embodiment, the insulating seal 30 is used to fill the gap between the pole 20 and the end cover 10. The solidified insulating seal 30 connects the pole 20 and the end cover 10 together. The insulating seal 30 completely fills the above gap, so that the insulating seal 30 and the pole 20 are sealed and matched, and there is no gap between the two; the insulating seal 30 and the end cover 10 are sealed and matched, and there is no gap between the two. At the same time, since the insulating seal 30 has insulating properties, the pole 20 and the end cover 10 can be insulated from each other. In addition, since the insulating seal 30 is softened by heat, the insulating seal 30 switches between the solid phase and the liquid phase. When a battery pack fails, a large amount of gas and heat are generated inside the battery pack. The heat is transferred to the cover plate assembly, and the insulating seal 30 is gradually softened or deformed due to the heat, so that the seal between the insulating seal 30 and the end cover 10 fails, and a first gap exists between the two; the seal between the insulating seal 30 and the pole 20 fails, and a second gap exists between the two. In this way, a large amount of gas and heat are released or discharged from the first gap and the second gap to the external environment, thereby avoiding safety problems in the battery pack.

[0061] In one embodiment, the insulating seal 30 is in a solid state at a first preset temperature between 100°C and 120°C; the insulating seal 30 is in a liquid state at a second preset temperature between 140°C and 160°C.

[0062] It should be noted that the selection of the first preset temperature and the second preset temperature is based on the fact that when a battery pack fails, a large amount of gas and heat is generated inside the battery pack, and the heat is transferred to the cover plate assembly, and the temperature range of the cover plate assembly after being heated is determined.

[0063] For example: the first preset temperature of the insulating seal 30 can be 100°C, and it is in a solid state below 100°C (including 100°C); the second preset temperature of the insulating seal 30 can be 140°C, and it is in a liquid state below 140°C (including 140°C).

[0064] The first preset temperature of the insulating seal 30 may be 110°C, and it is in a solid state below 110°C (including 110°C); the second preset temperature of the insulating seal 30 may be 150°C, and it is in a liquid state below 150°C (including 150°C).

[0065] The first preset temperature of the insulating seal 30 may be 120°C, and it is in a solid state below 120°C (including 120°C); the second preset temperature of the insulating seal 30 may be 160°C, and it is in a liquid state below 160°C (including 160°C).

[0066] In one embodiment, Figure 1-Figure 5 As shown, Fig.16 , Fig.17 As shown, the end cover 10 has a first end face 101 and a second end face 102 that are arranged oppositely, and the pole 20 has a third end face 201 and a fourth end face 202 that are arranged oppositely. The third end face 201 and the first end face 101 are arranged on the same side, and the fourth end face 202 and the second end face 102 are arranged on the same side. The insulating seal 30 includes a first stopper 31 and a second stopper 32, the first stopper 31 is matched with the first end face 101 and the third end face 201, and the second stopper 32 is matched with the second end face 102 and the fourth end face 202. In this way, the connection strength of the insulating seal 30 to the end cover 10 and the pole 20 can be improved.

[0067] In detail, in a specific embodiment, Figure 1-Figure 5 As shown, the end cover 10 is generally in a ring shape. The end cover 10 is provided with a through hole penetrating the end cover 10, and the through hole is a receiving portion 11. The end cover 10 has a first end face 101 and a second end face 102 arranged opposite to each other, wherein the first end face 101 is arranged upward, and the second end face 102 is arranged downward.

[0068] like Figure 1 and Figure 2 As shown, the pole 20 is roughly in a ring shape. The pole 20 is arranged in the above-mentioned through hole, and there is a gap between the pole 20 and the end cover 10. The pole 20 has a third end face 201 and a fourth end face 202 arranged opposite to each other, wherein the third end face 201 is arranged upward and the fourth end face 202 is arranged downward. The third end face 201 and the first end face 101 are arranged on the same side, that is, both are arranged upward, and the two can be located on the same plane, or the two can also be located on different planes. The fourth end face 202 and the second end face 102 are arranged on the same side, that is, both are arranged downward, and the two can be located on the same plane, or the two can also be located on different planes.

[0069] The insulating seal 30 includes a first stopper 31, a second stopper 32, and a connecting portion 33 connecting the first stopper 31 and the second stopper 32. The connecting portion 33 is sandwiched in the gap between the end cover 10 and the pole 20. Figure 1 and Figure 2 As shown, the upper end of the connecting portion 33 extends upward to form a first stopper 31, which abuts against the first end face 101 and the third end face 201 to limit the upward freedom of the end cover 10 and the pole 20; the lower end of the connecting portion 33 extends downward to form a second stopper 32, which abuts against the second end face 102 and the fourth end face 202 to limit the downward freedom of the end cover 10 and the pole 20. In this way, the first stopper 31 and the second stopper 32 firmly connect the end cover 10 and the pole 20 together.

[0070] Furthermore, in practical applications, Figure 1and Figure 2 As shown, Fig.16 and Fig.17 As shown, the battery cell 80 is located below the battery cover assembly, that is, the battery cell 80 is located below the end cover 10 of the battery cover assembly.

[0071] like Fig.16 and Fig.17 As shown, the first stopper 31 and the second stopper 32 are both in a ring shape. The first stopper 31 is arranged away from the battery cell 80, and the second stopper 32 is arranged close to the battery cell 80. The dimension r2 of the second stopper 32 in the radial direction is greater than the dimension r1 of the first stopper 31 in the radial direction. In this way, the second stopper 32 can support the end cover 10 and the pole 20 to the greatest extent. At the same time, under the premise of ensuring the connection strength between the end cover 10 and the pole 20, the material of the insulating seal 30 is saved as much as possible to reduce the production cost.

[0072] In one embodiment, the end cover 10 is provided with a first matching portion, and the insulating seal 30 is provided with a first matching connection portion, and the first matching connection portion matches with the first matching portion to connect the end cover 10 and the insulating seal 30 to each other. Or / and,

[0073] The pole 20 is provided with a second matching portion, and the insulating seal 30 is provided with a second matching connection portion, and the second matching connection portion matches with the second matching portion to connect the pole 20 and the insulating seal 30 to each other. The connection strength between the end cover 10 and the insulating seal 30 is improved by the mutual cooperation between the first matching portion and the first matching connection portion; similarly, the connection strength between the pole 20 and the insulating seal 30 is improved by the mutual cooperation between the second matching portion and the second matching connection portion.

[0074] It should be noted that the first mating portion and the first mating connecting portion are inserted into each other, and one of the first mating portion and the first mating connecting portion is a protrusion and the other is an inserting slot; similarly, the second mating portion and the second mating connecting portion are inserted into each other, and one of the second mating portion and the second mating connecting portion is a protrusion and the other is an inserting slot.

[0075] In detail, Figure 10-15As shown, the end cover 10 is provided with a first protrusion 12 extending toward the pole 20, and the first protrusion 12 is a first matching portion. That is, the first protrusion 12 is formed by extending from the inner surface of the through hole of the end cover 10 toward the center thereof. The first protrusion 12 can be fan-shaped, the first protrusion 12 can be ring-shaped, or the first protrusion 12 can be in other suitable shapes, which is not limited in this embodiment. The first protrusion 12 can be in a horizontal direction, or the first protrusion 12 can be inclined relative to the horizontal direction. The insulating seal 30 is provided with a first embedding slot 34 that is inserted and matched with the first protrusion 12, and the first embedding slot 34 is a first matching connection portion. The insulating seal 30 supports the first protrusion 12, so that the insulating seal 30 plays a good supporting role on the end cover 10.

[0076] like Fig.12 As shown, the pole 20 is provided with a second protrusion 23 extending toward the end cover 10, and the second protrusion 23 is a second matching portion. That is to say, the second protrusion 23 is extended from the outer surface of the side wall of the pole 20 to the outside thereof. The second protrusion 23 can be fan-shaped, the second protrusion 23 can be ring-shaped, or the second protrusion 23 can be in other suitable shapes, which is not limited in this embodiment. The second protrusion 23 can be in a horizontal direction, or the second protrusion 23 can be inclined relative to the horizontal direction. The insulating seal 30 is also provided with a second embedding slot 35 that is inserted and matched with the second protrusion 23, and the second embedding slot 35 is a second matching connection portion. The insulating seal 30 supports the second protrusion 23, so that the insulating seal 30 plays a good supporting role on the pole 20.

[0077] In this way, the insulating seal 30 plays a good supporting role on the end cover 10 and the pole 20 , which helps to ensure the relative position relationship between the end cover 10 and the pole 20 .

[0078] It should be noted that if Figure 11-15 As shown, the first matching portion and the first matching connecting portion are inserted and matched, and can also be as follows Fig.12 and Fig.13 As shown, the insulating seal 30 is provided with a fourth protrusion 36, which is a first mating connection portion, and the end cover 10 is provided with a first mating portion that is inserted and matched with the fourth protrusion 36, and the first mating portion is a third insertion slot 13. The second mating portion and the second mating connection portion are inserted and matched, and can also be as follows Fig.12 and Fig.13 As shown, a third protrusion 24 is provided on the pole, and the third protrusion 24 is a second matching portion. The insulating seal 30 has a second matching connection portion (not shown due to obstruction) that is inserted and matched with the third protrusion 24.

[0079] Of course, it is understandable that the first matching portion and the first matching connection portion can be snap-fitted; the second matching portion and the second matching connection portion can be snap-fitted. The first matching portion and the first matching connection portion can be threadedly matched; the second matching portion and the second matching connection portion can be threadedly matched.

[0080] In one embodiment, a thinned portion is provided on the pole 20 , and the thickness of the thinned portion is smaller than the thickness of the pole 20 .

[0081] It should be noted that the battery pack further includes a current collecting plate 60 located in the cavity of the housing 70. Figure 2 As shown, the collector plate 60 is located between the pole 20 (or the end cover 10) and the battery cell 80. The collector plate 60 is welded to the pole 20. Considering the quality of welding, a thinning area is provided on the pole 20, and the thickness of the thinning area is less than the overall thickness of the pole 20. In this way, laser can be used to penetrate the thinning area to achieve welding connection between the collector plate 60 and the thinning area. In this way, the related technology: multi-step folding of the collector plate 60 is avoided, welding is convenient and simple, and it helps to reduce production costs.

[0082] In a specific embodiment, a groove 21 is provided on the pole 20, and the bottom of the groove 21 is used as a thinning portion. The bottom thickness of the groove 21 is in the range of 0.3-1.5 mm, and the diameter is in the range of 4 mm-25 mm.

[0083] like Fig.16 , Fig.18 As shown, the surface of the pole 20 facing away from the collector plate 60 is concave to form a groove 21a, and the bottom of the groove 21a is a thinned portion. The middle part of the collector plate 60 is formed by multiple stamping and drawing to form a first bulge, and the first bulge has an elastic buffering effect. The first bulge is in contact with the bottom plane of the groove 21a, and the two are welded together. The collector plate 60 can achieve flexible buffering with the battery cover assembly. When the battery cell 80 is axially displaced, the pole ear under the collector plate 60 will not be torn by force. Or,

[0084] like Fig.17 , Fig.18 As shown, the surface of the pole 20 facing the current collecting plate 60 is concave to form a groove 21b, and the bottom of the groove 21b is a thinned portion. The middle part of the current collecting plate 60 is formed by multiple stamping and drawing to form a second convex bump, which has an elastic buffering effect. The second convex bump is in contact with the bottom plane of the groove 21b, and the two are welded. The current collecting plate 60 can achieve flexible buffering with the battery cover assembly, and when the battery cell 80 is axially displaced, the pole ear under the current collecting plate 60 will not be torn by force.

[0085] Furthermore, the battery cover assembly also includes a sealing cover 50 and a liquid injection plug 40 .

[0086] In a specific embodiment, Figure 2 , Figure 7 , Fig.12 As shown, a liquid injection hole 22 is provided at the bottom of the groove 21. The liquid injection hole 22 is sealed with the liquid injection plug 40.

[0087] The groove 21 may be a stepped groove. For example, the groove 21 is a two-stage stepped groove, including a first stepped groove 211 and a second stepped groove 212, wherein the first stepped groove 211 is located below the second stepped groove 212. The sealing cover 50 is disposed at the second stepped groove 212 to seal the opening of the second stepped groove 212.

[0088] The second aspect of the present embodiment provides a battery pack, comprising the battery cell 80 in the first aspect and the battery end cover 10 assembly in the first aspect. The battery pack is a cylindrical battery, and the battery pack has the advantages of the battery end cover 10 assembly, so it will not be described in detail.

[0089] The third aspect of this embodiment provides an electric device, including the battery pack in the second aspect. The electric device can be a battery car, an electric motorcycle, an electric toy car, etc. The electric device has the advantages of the battery end cover 10 assembly, so it will not be repeated.

[0090] Through the description of the above embodiments, those skilled in the art can easily understand that the example embodiments described herein can be implemented by hardware.

[0091] Those skilled in the art should understand that the scope of disclosure involved in this application is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the aforementioned disclosed concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in this application.

[0092] It should be understood that the terms "width", "up", "down", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0093] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article may indicate that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0094] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of the protection claimed by the utility model.

Claims

1. A battery cover assembly, characterized in that: include An end cover (10), wherein the end cover (10) is provided with a receiving portion (11); A pole (20), wherein the pole (20) is arranged in the accommodating portion (11), and a gap exists between the pole (20) and the accommodating portion (11). An insulating seal (30) is softened by heat so that the insulating seal switches between a solid state and a liquid state. The insulating seal (30) is arranged in the gap to connect the pole (20) and the end cover (10), and the pole (20) and the end cover (10) are insulated from each other.

2. The battery cover assembly according to claim 1, characterized in that: The end cover (10) has a first end face (101) and a second end face (102) that are arranged opposite to each other, the pole (20) has a third end face (201) and a fourth end face (202) that are arranged opposite to each other, the third end face (201) and the first end face (101) are arranged on the same side, and the fourth end face (202) and the second end face (102) are arranged on the same side. The insulating seal (30) comprises a first stopper (31) and a second stopper (32), wherein the first stopper (31) is in stopper cooperation with the first end face (101) and the third end face (201), and the second stopper (32) is in stopper cooperation with the second end face (102) and the fourth end face (202).

3. The battery cover assembly according to claim 2, characterized in that: The first stopper (31) and the second stopper (32) are both ring-shaped, and the radial size of the first stopper (31) and the second stopper (32) closer to the battery cell is larger than the radial size of the first stopper (31) and the second stopper (32) farther from the battery cell.

4. The battery cover assembly according to claim 1, characterized in that: The end cover (10) is provided with a first matching portion, the insulating seal (30) is provided with a first matching connection portion, the first matching connection portion matches with the first matching portion so that the end cover (10) and the insulating seal (30) are connected to each other, or / and, The pole (20) is provided with a second matching portion, the insulating seal (30) is provided with a second matching connection portion, and the second matching connection portion matches with the second matching portion so that the pole (20) and the insulating seal (30) are connected to each other.

5. The battery cover assembly according to claim 4, characterized in that: The first matching portion and the first matching connecting portion are plug-fitted, or / and, The second matching portion and the second matching connecting portion are inserted and fitted.

6. The battery cover assembly according to claim 5, characterized in that: The end cover (10) is provided with a first protrusion (12) extending toward the pole (20), the first protrusion (12) being the first matching portion, the insulating seal (30) is provided with a first inserting slot (34) inserted and matched with the first protrusion (12), the first inserting slot (34) being the first matching connection portion; or / and, The pole (20) is provided with a second protrusion (23) extending toward the end cover (10), the second protrusion (23) being the second matching portion, and the insulating seal (30) is provided with a second embedding slot (35) which is inserted and matched with the second protrusion (23), the second embedding slot (35) being the second matching connection portion.

7. The battery cover assembly according to claim 1, characterized in that: A thinning portion is provided on the pole (20), and the thickness of the thinning portion is smaller than the thickness of the pole (20).

8. The battery cover assembly according to claim 7, characterized in that: The thinned portion is used to connect with the current collecting disk (60); the surface of the pole (20) facing away from or toward the current collecting disk (60) is recessed to form a groove (21); the bottom of the groove (21) is the thinned portion.

9. The battery cover assembly according to claim 8, characterized in that: A liquid injection hole (22) is provided at the bottom of the groove (21), and the liquid injection hole (22) is sealed and matched with the liquid injection plug (40).

10. The battery cover assembly according to claim 1, characterized in that: The insulating seal (30) is in the solid phase at a first preset temperature, the first preset temperature being between 100°C and 120°C; the insulating seal (30) is in the liquid phase at a second preset temperature, the second preset temperature being between 140°C and 160°C.

11. A battery pack, characterized in that: The invention comprises a battery cell and a battery end cover assembly according to any one of claims 1 to 10, wherein the battery pack is a cylindrical battery.

12. An electrical equipment, characterized in that: A battery pack comprising the battery pack of claim 11.

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