Battery and battery pack

Abstract

The embodiment of the utility model provides a battery and a battery pack. The battery comprises a shell, wherein an accommodating cavity with an opening is formed in the shell; the roll core is arranged in the accommodating cavity, and a tab is arranged at the end part, close to the opening, of the roll core; the cover plate comprises a pole, a metal cover frame and an insulating part; the metal cover frame covers the opening in a sealing manner and is connected with the shell; a pole hole is formed in the metal cover frame in a penetrating manner; the pole penetrates through the pole hole and is connected with the tab; the insulating part is wound on the peripheral side of the pole; a first connecting piece is arranged on the outer side of the pole, a second connecting piece is arranged on the inner side wall of the pole hole, and the insulating piece is respectively connected with the first connecting piece and the second connecting piece. Therefore, the connection tightness between the pole and the shell can be ensured, and the overall strength of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a battery and a battery pack. Background Art

[0002] In recent years, with the continuous development of new energy vehicles, batteries, as the power source of new energy batteries, have been widely used in new energy vehicles.

[0003] At present, the battery includes a shell and a cover plate connected to the shell. The pole on the cover plate is usually connected to the shell through an insulating member. Since the insulating member is made of plastic and the shell is made of metal, the tightness of the connection between the pole and the shell cannot be guaranteed. Utility Model Content

[0004] In order to solve or partially solve the above problems, the utility model discloses a battery and a battery pack to solve the problem in the prior art that the battery cannot ensure the tightness of the connection between the pole and the shell.

[0005] In order to solve the above problems, in a first aspect, an embodiment of the utility model provides a battery, the battery comprising:

[0006] A housing, wherein a receiving cavity having an opening is provided in the housing;

[0007] A winding core is arranged in the accommodating cavity, and a pole ear is arranged at an end of the winding core close to the opening;

[0008] A cover plate, the cover plate comprising a pole, a metal cover frame and the insulating member;

[0009] The metal cover frame covers the opening and is connected to the shell, and a pole hole is provided through the metal cover frame;

[0010] The pole is passed through the pole hole and connected to the pole ear;

[0011] The insulating member is wound around the circumference of the pole;

[0012] A first connecting piece is disposed on the outer side of the pole, a second connecting piece is disposed on the inner side wall of the pole hole, and the insulating piece is connected to the first connecting piece and the second connecting piece respectively.

[0013] Optionally, a first through hole is penetrated through the first connecting member, a second through hole is penetrated through the second connecting member, a portion of the insulating member is penetrated through the first through hole, and another portion of the insulating member is penetrated through the second through hole.

[0014] Optionally, the first connecting member is a first connecting piece, the first connecting piece is extended along the circumference of the pole, and the second connecting member is a second connecting piece, the second connecting piece is extended along the circumference of the inner side wall of the pole hole;

[0015] Alternatively, the first connecting member is a plurality of first bosses, which are evenly arranged around the pole; the second connecting member is a plurality of second bosses, which are evenly arranged around the inner side wall of the pole hole.

[0016] Optionally, the pole is a positive pole, and the insulating member wound around the circumference of the positive pole is a conductive insulating member.

[0017] Optionally, the cover plate is a first cover plate, one end of the shell has the opening, and the first cover plate is sealed on the opening;

[0018] The first cover plate includes two first poles and a first metal cover frame. The two first poles are located at two ends of the first metal cover frame and are both insulated from the first metal cover frame.

[0019] Optionally, the cover plate includes two second cover plates;

[0020] Both ends of the shell have the openings, and the two second cover plates are respectively covered on the two openings;

[0021] The second cover plate includes a second pole and a second metal cover frame, and the second pole is insulated from the second metal cover frame.

[0022] Optionally, the winding core includes a plurality of stacked pole pieces.

[0023] Optionally, the end of the pole away from the winding core protrudes from the insulating member, and the height of the pole protruding from the insulating member is not less than 0.01 mm.

[0024] Optionally, a liquid injection hole is provided through the metal cover frame, and the liquid injection hole is communicated with the accommodating cavity;

[0025] and / or,

[0026] The battery also includes an explosion-proof valve;

[0027] The shell or the metal cover frame is provided with a pressure relief hole connected with the accommodating cavity, the explosion-proof valve is arranged on the shell and covers the pressure relief hole, wherein the number of the explosion-proof valves is greater than or equal to 2.

[0028] Optionally, the pole is welded to the pole lug, and the area of ​​the orthographic projection of the welding portion between the pole and the pole lug is a first area, the area of ​​the orthographic projection of the cover plate is a second area, and the ratio between the first area and the second area is 0.3 to 0.9.

[0029] In a second aspect, an embodiment of the utility model provides a battery pack, which includes the battery described in any embodiment of the first aspect.

[0030] In the embodiment of the utility model, since the cover plate includes a pole, a metal cover frame and an insulating member, the pole is inserted into the metal cover frame, the metal cover frame seals the opening and is connected to the shell, and a pole hole is provided through the metal cover frame, the pole is inserted into the pole hole and is connected to the pole ear, so the pole can be directly connected to the shell through the metal cover frame, thereby ensuring the tightness of the connection between the pole and the shell, and improving the overall strength of the battery. At the same time, the pole ear is directly connected to the pole, and the resistance is proportional to the length of the conductor, which shortens the connection length, reduces the internal resistance of the battery, and removes the pin pole ear, saving the cost of the battery. Furthermore, since the insulating member is wound around the circumference of the pole, a first connecting member is provided on the outer side of the pole, and a second connecting member is provided on the inner wall of the pole hole, and the insulating member is respectively connected to the first connecting member and the second connecting member, not only can the metal cover frame and the pole be insulated by the insulating member, thereby achieving the effect of isolating the pole and the metal cover frame, but also the insulating member can be located between the metal cover frame and the pole, thereby enhancing the connection strength between the metal cover frame and the pole, reducing the welding area and materials, and reducing the assembly and manufacturing cost of the battery. At the same time, the bonding strength of the insulating member during injection molding can be enhanced by the first connecting member and the second connecting member. In summary, the embodiment of the utility model can ensure the tightness of the connection between the pole and the shell, and improve the overall strength of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a schematic diagram of the first battery explosion structure provided by the embodiment of the utility model;

[0033] Figure 2 It is a schematic diagram of the exploded structure of the cover plate included in the first battery provided by the embodiment of the utility model;

[0034] Figure 3 This is one of the assembly schematic diagrams of the first battery provided by the embodiment of the utility model;

[0035] Figure 4 This is the second assembly diagram of the first battery provided by the embodiment of the utility model;

[0036] Figure 5 This is the third assembly diagram of the first battery provided by the embodiment of the utility model;

[0037] Figure 6 This is a schematic diagram of a second battery explosion structure provided by an embodiment of the utility model;

[0038] Figure 7 It is a schematic diagram of the exploded structure of the cover plate included in the second battery provided by the embodiment of the utility model;

[0039] Figure 8 It is a schematic diagram of the assembly of the second battery provided by the embodiment of the utility model.

[0040] Description of reference numerals:

[0041] 1-shell; 2-cover; 3-winding core; 4-ear; 5-explosion-proof valve; 21-first cover; 22-second cover; 201-pole; 202-metal cover frame; 203-insulating member; 211-first pole; 221-second pole; 212-first metal cover frame; 222-second metal cover frame; 2011-first connecting member; 2021-second connecting member; 2022-liquid injection hole; 20111-first through hole; 20211-second through hole. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0044] In a first aspect, an embodiment of the present utility model provides a battery, such as Figures 1 to 8 As shown, the battery includes:

[0045] The housing 1 has an accommodating cavity with an opening.

[0046] The winding core 3 is arranged in the accommodating cavity, and a pole ear 4 is arranged at the end of the winding core 3 close to the opening.

[0047] The cover plate 2 includes a pole 201, a metal cover frame 202 and an insulating member 203. The pole 201 is inserted into the metal cover frame 202. The metal cover frame 202 covers the opening and is connected to the housing 1. A pole hole is provided on the metal cover frame 202. The pole 201 is inserted into the pole hole and connected to the pole ear 4.

[0048] The insulating member 203 is wound around the pole 201 . A first connector 2011 is disposed on the outer side of the pole 201 . A second connector 2021 is disposed on the inner side wall of the pole hole. The insulating member 203 is connected to the first connector 2011 and the second connector 2021 , respectively.

[0049] It can be seen from the above embodiments that in the embodiments of the utility model, since the cover plate 2 includes a pole 201, a metal cover frame 202 and an insulating member 203, the pole 201 is penetrated by the metal cover frame 202, the metal cover frame 202 covers the opening and is connected to the shell 1, and a pole hole is penetrated on the metal cover frame 202, the pole 201 is penetrated by the pole hole and connected to the pole ear 4, so the pole 201 can be directly connected to the shell 1 through the metal cover frame 202, thereby ensuring the tightness of the connection between the pole 201 and the shell 1, and improving the overall strength of the battery. At the same time, the pole ear 4 is directly connected to the pole 201, and the resistance is proportional to the length of the conductor, which shortens the connection length, reduces the internal resistance of the battery, and removes the pin pole ear, saving the cost of the battery. Since the insulating member 203 is wound around the circumference of the pole 201, the outer side of the pole 201 is provided with a first connector 2011, and the inner side wall of the pole hole is provided with a second connector 2021, the insulating member 203 is connected to the first connector 2011 and the second connector 2021 respectively, so that not only can the insulating member 203 be provided between the metal cover frame 202 and the pole 201 for insulation, so as to achieve the effect of isolating the pole 201 and the metal cover frame 202, but also the insulating member 203 can be located between the metal cover frame 202 and the pole 201, so as to enhance the connection strength between the metal cover frame 202 and the pole 201, reduce the welding area and materials, and reduce the assembly manufacturing cost of the battery. At the same time, the bonding strength of the insulating member 203 during injection molding can be enhanced by the first connector 2011 and the second connector 2021. In summary, the embodiment of the utility model can ensure the tightness of the connection between the pole 201 and the shell 1, and improve the overall strength of the battery.

[0050] Among them, in the above embodiment, the shell 1 can be a cylindrical shell 1, or a square shell 1, or a shell 1 of other shapes. The specific shape and type of the shell 1 are determined according to the shape of the winding core 3 in the housing cavity of the shell 1, and the embodiment of the utility model does not limit this. The shell 1 can be a shell 1 structure with openings at both ends, or a shell 1 structure with openings at one end. In addition, the material of the shell 1 can be any one of aluminum alloy, steel, polypropylene, polycarbonate and the like.

[0051] The cover plate 2 is a structure used to protect the battery and prevent the battery from being damaged. The cover plate 2 can not only protect the battery from being eroded by external substances, such as water, sand, soil, etc., but also prevent the battery from being hit and squeezed, thereby improving the safety performance of the battery. In an embodiment of the utility model, the cover plate 2 includes a pole 201 and a metal cover frame 202. The pole 201 is used to connect the positive and negative pole ears of the battery, and connect the positive and negative pole ears to an external circuit. The material of the pole 201 is usually a metal with good electrical conductivity such as copper, nickel, and aluminum to ensure the smooth flow of current. The metal cover frame 202 is a metal frame with good performance and high temperature resistance such as copper, nickel, and aluminum. The metal cover frame 202 is sealed on the opening of the shell and connected to the shell 1. The shape of the metal cover frame 202 is determined according to the shape of the shell 1. For example, when the shape of the shell 1 is cylindrical, the metal cover frame 202 is circular, and when the shape of the shell 1 is square, the metal cover frame 202 is square. In addition, since the metal cover frame 202 and the pole 201 are both made of metal materials, insulation treatment needs to be performed when the metal cover frame 202 and the pole 201 are connected. Usually, a pole hole through which the pole 201 passes is provided in the metal cover frame 202, one end of the pole 201 passes through the pole hole, the other end of the pole 201 is connected to the pole ear 4, and the contact portion between the pole 201 and the metal cover frame 202 is injection-molded and sealed. The metal cover frame 202 and the housing 1 can be connected by welding, and the welding can be at least one of carbon dioxide shielded welding, resistance spot welding, laser welding and the like.

[0052] When the winding core 3 and the shell 1 are installed, the winding core 3 can be first welded to the pole 201 included in the cover plate 2, and then the winding core 3 is assembled into the accommodating cavity of the shell 1, and then the metal cover frame 202 and the shell 1 are welded. Among them, the winding core 3 can be in a laminated form or a wound form, and the embodiment of the utility model does not limit this. It should be noted that the component for connecting the winding core 3 and the pole 201 is the end ear 4, and the ear 4 can be located on the same side of the winding core 3, or on different sides of the winding core 3. Of course, when the ear 4 is located on the same side or different sides of the winding core 3, it corresponds to the connection of the cover plate 2 with different structures.

[0053] Regarding the insulation setting of the pole 201 and the metal cover frame 202, in some embodiments, the cover plate 2 also includes an insulating member 203; the insulating member 203 is located on the side of the metal cover frame 202 away from the winding core 3, and the insulating member 203 is wound around the pole 201. Specifically, the insulating member 203 can be a frame-shaped structure, and the insulating member 203 is wound around the pole 201, so that the insulating member 203 is provided between the metal cover frame 202 and the pole 201 for insulation, thereby achieving the effect of isolating the pole 201 and the metal cover frame 202, and at the same time, the insulating member 203 can be located between the metal cover frame 202 and the pole 201, thereby enhancing the connection strength between the metal cover frame 202 and the pole 201, reducing the welding area and material, and reducing the assembly and manufacturing cost of the battery. It should be noted that the shape of the insulating member 203 is determined according to the shape of the pole 201 and the shape of the metal cover frame 202. Exemplarily, when the shape of the pole 201 is a square block structure and the metal cover frame 202 is a square frame shape, the shape of the insulating part 203 is a square frame structure; when the shape of the pole 201 is a cylindrical block structure and the metal cover frame 202 is a circular frame shape, the shape of the insulating part 203 is ring-shaped.

[0054] In addition, a first connector 2011 is provided on the outer side of the pole 201, and a second connector 2021 is provided on the inner side of the pole hole. Specifically, the first connector 2011 can be a convex block, a connecting piece or other forms of structure, and the edge of the first connector 2011 away from the middle of the pole 201 can be a curved surface structure or a flat structure. The number of the first connectors 2011 is multiple, and the multiple first connectors 2011 are arranged around the outer side of the pole 201 in a circle, and the multiple first connectors 2011 are arranged at intervals between each two adjacent ones. The first connector 2011 protrudes from the outer side of the pole 201 and is arranged in a direction close to the metal cover frame 202. The second connector 2021 is arranged on the inner side of the metal cover frame 202, that is, the second connector 2021 is arranged on the edge of the pole hole of the metal cover frame 202 for assembling the pole 201. Similarly, the second connector 2021 may be a bump, a connecting piece or other forms of structures, and the edge of the second connector 2021 away from the metal cover frame 202 may be a curved structure or a flat structure. There are multiple second connectors 2021, and multiple second connectors 2021 are arranged around the metal cover frame 202 for assembling the pole hole of the pole 201, and the multiple second connectors 2021 are arranged at intervals between every two adjacent ones. The second connector 2021 protrudes from the edge of the pole hole of the metal cover frame 202 for assembling the pole 201, and is arranged in a direction close to the pole 201.

[0055] Next, the specific structure of the battery provided by the embodiment of the utility model and other implementation methods are specifically introduced as follows:

[0056] In some embodiments, Figure 4 and Figure 5 As shown, a first through hole 20111 is penetrated on the first connecting member 2011 , a second through hole 20211 is penetrated on the second connecting member 2021 , a part of the insulating member 203 is penetrated in the first through hole 20111 , and another part of the insulating member 203 is penetrated in the second through hole 20211 .

[0057] Specifically, in this embodiment, when the insulating member 203 is injection-molded and connected between the pole 201 and the metal cover frame 202, the insulating member 203 is sequentially passed through the first through hole 20111 and the second through hole 20211, and then the bonding strength during injection molding is enhanced by the insulating member 203 in the first through hole 20111 and the second through hole 20211. At the same time, when part of the insulating member 203 is passed through the first through hole 20111 and the other part of the insulating member 203 is passed through the second through hole 20211, the connection between the pole 201 and the metal cover frame 202 can be limited, and the tightness of the connection between the pole 201 and the housing 1 is further ensured. In order to facilitate the intuitive representation of the assembly relationship between the pole 201, the metal cover frame 202 and the insulating member 203, the insulating member 203 is made transparent, that is, in Figure 4 and Figure 5 In FIG. 2 , the shaded portion represents the insulating member 203 .

[0058] Further, for the structure of the first connecting member 2011 and the structure of the second connecting member 2021, in a possible implementation, the first connecting member 2011 is a first connecting piece, which is extended along the circumference of the pole, and the second connecting member 2021 is a second connecting piece, which is extended along the circumference of the inner side wall of the pole hole;

[0059] In another possible implementation, the first connector 2011 is a plurality of first bosses, which are evenly arranged around the pole; the second connector 2021 is a plurality of second bosses, which are evenly arranged around the inner wall of the pole hole.

[0060] It should be noted that, no matter the structure of the first connector 2011 and the structure of the second connector 2021 are connecting pieces, or the structure of the first connector 2011 and the structure of the second connector 2021 are bosses, the bonding strength during strong injection molding can be further increased by the area of ​​the first connector 2011 and the second connector 2021. In addition, it should be noted that, in some embodiments, the first connector 2011 and the second connector 2021 can be stacked in the first direction, that is, the orthographic projection of the first connector 2011 in the first direction overlaps the orthographic projection of the second connector 2021 in the first direction, so that the first through hole 20111 and the second through hole 20211 are aligned in the first direction, so that it is convenient to inject the insulating member 203 in the first through hole 20111 and the second through hole 20211, reducing the difficulty of injection molding. In other embodiments, the first connector 2011 and the second connector 2021 may be staggered in the first direction, that is, the first connector 2011 and the second connector 2021 may not overlap in the first direction, and a second connector 2021 is correspondingly arranged between every two first connectors 2011, so that the distribution area of ​​the first connector 2011 and the second connector 2021 can be increased, thereby further increasing the bonding strength during strong injection molding. The first direction is a direction perpendicular to the plane where the pole 201 is located.

[0061] In the above embodiment, the pole 201 is a positive pole, and the insulating member 203 wound around the positive pole is a conductive insulating member 203. It should be noted that the insulating member 203 arranged on the negative pole side is an insulating material, which may be rubber, plastic or the like, and the insulating member 203 arranged on the positive pole is a conductive insulating material, that is, a conductive medium is added to the insulating member.

[0062] Regarding the position of the first pole 211 in the battery, in one possible implementation, the cover 2 is a first cover 21, one end of the shell 1 has an opening, and the first cover 21 covers the opening; the first cover 21 includes two first poles 211 and a first metal cover frame 212, the two first poles 211 are located at both ends of the first metal cover frame 212, and are both insulated from the first metal cover frame 212.

[0063] In this embodiment, the housing 1 is a housing 1 with an opening at one end, that is, only one end of the housing 1 needs to be capped by the first cover plate 21. The two first poles 211 are respectively a positive pole and a negative pole, that is, an embodiment in which the positive pole and the negative pole are located on the same side of the battery. In this embodiment, there is one first metal cover frame 212, and the first metal cover frame 212 needs to include two first cavities and second cavities arranged in parallel, the first cavity is used to accommodate the positive pole, and the second cavity is used to accommodate the negative pole. The cavity size and shape of the first cavity are completely consistent with the second cavity, and the cavity size and shape of the first cavity are determined according to the shape and size of the positive pole, and the cavity size and shape of the second cavity are determined according to the shape and size of the negative pole. In this way, through the above embodiment, the positive pole and the negative pole of the battery are arranged on the same side, which can reduce the volume of the battery on the one hand, so that the battery can be applied to smaller application scenarios, and on the other hand, it can facilitate the identification of the polarity of the battery and effectively prevent battery leakage.

[0064] In another possible implementation, the cover plate 2 includes two second cover plates 22; both ends of the shell 1 have openings, and the two second cover plates 22 respectively cover the two openings; the second cover plate 22 includes a second pole 221 and a second metal cover frame 222, and the second pole 221 is insulated from the second metal cover frame 222.

[0065] In this embodiment, the shell 1 is a shell 1 structure with openings at both ends, that is, the shell 1 is a cylindrical structure, and both ends of the shell 1 need to be covered by a second cover plate 22. The two second poles 221 are respectively a positive pole and a negative pole, that is, an implementation method in which the positive pole and the negative pole are located on different sides of the battery. In this implementation method, there are two second metal cover frames 222, and each second metal cover frame 222 needs to be provided with a cavity for installing a positive pole or a negative pole. In this way, through the above embodiment, the positive pole and the negative pole of the battery are arranged on different sides, compared with the positive pole and the negative pole of the battery being arranged on the same side, the electrical connection area of ​​the second pole 221 and the pole lug 4 of the winding core 3 can be increased, thereby increasing the flow area of ​​the pole lug 4, improving the current carrying capacity of the pole lug 4, and improving the battery charge and discharge rate, while improving the structural firmness and heat dissipation effect of the battery.

[0066] In some embodiments, the winding core 3 includes a plurality of stacked pole pieces. In this way, the battery adopts a lamination process, and can fully utilize the space inside the battery housing 1, improve the energy density, and at the same time improve the structural stability and safety performance of the battery, thereby improving the cycle life of the battery.

[0067] In some embodiments, the end of the pole 201 away from the winding core 3 protrudes from the insulating member 203, and the height of the pole 201 protruding from the insulating member 203 is not less than 0.01 mm.

[0068] In this embodiment, the dimension of the insulating member 203 in the first direction is greater than or equal to 0.1 mm, and the end of the pole 201 away from the winding core 3 protrudes from the insulating member 203, that is, there is a height difference between the end face of the pole 201 in the first direction and the end face of the insulating member 203 away from the winding core 3. In the case where the height of the pole 201 protruding from the insulating member 203 is not less than 0.01 mm, that is, the height difference between the end face of the pole 201 in the first direction and the end face of the insulating member 203 away from the winding core 3 is greater than or equal to 0.01 mm, the welding height of the pole 201 can be guaranteed, and the welding height of the pole 201 can be guaranteed.

[0069] In some other embodiments, a liquid injection hole 2022 is formed through the metal cover frame 202 , and the liquid injection hole 2022 is communicated with the accommodating cavity.

[0070] In this embodiment, since the metal cover frame 202 is provided with an injection hole 2022, and the injection hole 2022 is connected to the accommodating cavity, it is convenient to inject electrolyte into the shell 1 after the cover plate 2 and the shell 1 are welded. In addition, it should be noted that the positions of the injection hole 2022 are different when the positive pole and the negative pole are located on the same side of the battery, and when the positive pole and the negative pole are located on different sides of the battery. Specifically, when the positive pole and the negative pole are located on the same side of the battery, that is, when the first cover plate 21 includes two first poles 211 and a first metal cover frame 212, and the two first poles 211 are located at both ends of the first metal cover frame 212, the injection hole 2022 can be set on the first metal cover frame 212 between the two first poles 211. When the positive electrode column and the negative electrode column are located on different sides of the battery, that is, the second cover plate 22 includes a second electrode column 221 and a second metal cover frame 222, and the second electrode column 221 is insulated from the second metal cover frame 222, the injection hole 2022 can be located at the corner of the second metal cover frame 202.

[0071] In some possible implementations, the battery further includes an explosion-proof valve 5. In this way, the explosion-proof valve 5 can quickly rupture and release the pressure in the battery housing 1 when an abnormal state such as thermal runaway occurs inside the battery, thereby preventing the battery from exploding and other risks and ensuring battery safety.

[0072] Furthermore, a pressure relief hole communicating with the accommodating chamber is provided on the shell 1, and an explosion-proof valve 5 is arranged on the shell 1 and covers the pressure relief hole, wherein the number of the explosion-proof valves 5 is greater than or equal to 2.

[0073] It should be noted that the pressure relief hole is a through hole structure arranged on the shell 1, and can be arranged on any surface of the shell 1, or can also be arranged on the metal cover frame 202, thereby reducing damage to the shell 1. The pressure relief hole is connected to the accommodating cavity and then covered by the explosion-proof valve 5. In this way, the explosion-proof valve 5 can ensure the safety of the battery.

[0074] In this embodiment, the explosion-proof valve 5 and the pressure relief hole are located on the side of the housing 1 different from the pole piece, which can rupture more quickly to release the pressure in the housing 1, thereby preventing the risk of battery explosion. In addition, since the number of explosion-proof valves 5 is greater than or equal to 2, once a certain explosion-proof valve 5 fails or the explosion-proof effect is insufficient, another explosion-proof valve 5 can be used to quickly rupture and release the pressure in the battery housing 1, further improving the safety performance of the battery.

[0075] In addition, it should be noted that the explosion-proof valve 5 can be a piston spring explosion-proof valve. It can also be a pinhole explosion-proof valve, or other forms of explosion-proof valve 5, which is not limited in the embodiments of the present utility model. Taking the pinhole explosion-proof valve as an example, when the pressure inside the battery is much greater than the ambient pressure or the internal pressure reaches the explosion value set by the explosion-proof valve 5, it belongs to the explosion-proof working state. At this time, the internal gas pressure of the battery housing 1 will push open the spring piston rod built into the explosion-proof valve 5, and the gas will be directly connected to the external environment through an unobstructed channel to achieve rapid gas discharge, thereby quickly reducing the internal pressure of the battery pack and preventing the battery from exploding. When the air pressure inside the battery housing 1 drops below the explosion value set by the piston explosion-proof valve 5 after exhaust, the piston rod returns to its original position, and the explosion-proof valve 5 immediately returns to its normal working state.

[0076] In some embodiments, the pole 201 is welded on the pole lug 4, and the orthographic projection area of ​​the welding portion of the pole 201 and the pole lug 4 is the first area, the orthographic projection area of ​​the cover plate 2 is the second area, and the ratio between the first area and the second area is 0.3 to 0.9.

[0077] It should be noted that, in this embodiment, when the ratio between the first area and the second area is the lower limit value of 0.3, that is, the ratio between the area of ​​the orthographic projection of the welding portion of the pole 201 and the pole lug 4 and the orthographic projection area of ​​the cover plate 2 is 0.3. In this case, the positive pole and the negative pole are usually on the same side, that is, even when the positive pole and the negative pole are on the same side, it is necessary to make the ratio between the area of ​​the orthographic projection of the welding portion of the positive pole and the pole lug 4 and the orthographic projection area of ​​the cover plate 2 at least 0.3, and the ratio between the area of ​​the orthographic projection of the welding portion of the negative pole and the pole lug 4 and the orthographic projection area of ​​the cover plate 2 at least 0.3. Since the resistance of the conductor is inversely proportional to the cross-sectional area of ​​the conductor when the length of the conductor is determined, the cross-sectional area of ​​the pole 201 can be maximized while ensuring the area of ​​the welding portion of the pole 201 and the pole lug 4, and the internal resistance of the battery when grouped is welded can be reduced. When the ratio between the first area and the second area is the upper limit value of 0.9, that is, the ratio between the area of ​​the orthographic projection of the welding portion of the pole 201 and the pole lug 4 and the orthographic projection area of ​​the cover plate 2 is 0.9. In this case, usually the positive pole and the negative pole are on different sides, that is, the positive pole and the negative pole are on different sides. It is necessary to make the ratio between the area of ​​the orthographic projection of the welding portion of the positive pole and the pole lug 4 and the orthographic projection area of ​​the cover plate 2 be a maximum of 0.9, and the ratio between the area of ​​the orthographic projection of the welding portion of the negative pole and the pole lug 4 and the orthographic projection area of ​​the cover plate 2 be a maximum of 0.9, thereby ensuring that the internal resistance of the battery is reduced during group welding while avoiding the size of the metal cover frame 202 being small, thereby ensuring the overall structural strength of the battery.

[0078] It can be seen from the above embodiments that in the embodiments of the utility model, since the cover plate 2 includes a pole 201, a metal cover frame 202 and an insulating member 203, the pole 201 is penetrated by the metal cover frame 202, the metal cover frame 202 covers the opening and is connected to the shell 1, and a pole hole is penetrated on the metal cover frame, the pole 201 is penetrated by the pole hole and connected to the pole ear 4, so the pole 201 can be directly connected to the shell 1 through the metal cover frame 202, thereby ensuring the tightness of the connection between the pole 201 and the shell 1, and improving the overall strength of the battery. At the same time, the pole ear 4 is directly connected to the pole 201, and the resistance is proportional to the length of the conductor, which shortens the connection length, reduces the internal resistance of the battery, and removes the pin pole ear, saving the cost of the battery.

[0079] In addition, since the insulating member 203 is wound around the circumference of the pole 201, a first connecting member 2011 is provided on the outer side of the pole 201, and a second connecting member 2021 is provided on the inner wall of the pole hole, and the insulating member 203 is connected to the first connecting member 2011 and the second connecting member 2021 respectively, not only can the insulating member 203 be provided between the metal cover frame 202 and the pole 201 for insulation, thereby achieving the effect of isolating the pole 201 and the metal cover frame 202, but also the insulating member 203 can be located between the metal cover frame 202 and the pole 201, thereby enhancing the connection strength between the metal cover frame 202 and the pole 201, reducing the welding area and materials, and reducing the assembly and manufacturing cost of the battery. At the same time, the insulating member 203 passes through the first through hole 20111 and the second through hole 20211 in sequence, and then the bonding strength during injection molding is enhanced by the insulating member 203 in the first through hole 20111 and the second through hole 20211. At the same time, when part of the insulating member 203 is passed through the first through hole 20111 and the other part of the insulating member 203 is passed through the second through hole 20211, the connection between the pole 201 and the metal cover frame 202 can be limited, further ensuring the tightness of the connection between the pole 201 and the shell 1.

[0080] In the second aspect, an embodiment of the utility model further provides a battery pack, which includes the battery described in any embodiment of the first aspect. The beneficial effects of the battery pack are consistent with the beneficial effects of the battery described in any embodiment of the first aspect, and the embodiments of the utility model will not repeat them.

[0081] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0082] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0083] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used 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 "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal 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 terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0084] The utility model has been introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for general technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A battery, characterized in that: The battery comprises: A housing (1), wherein a receiving cavity having an opening is provided in the housing (1); A winding core (3) is arranged in the accommodating cavity, and an end of the winding core (3) close to the opening is provided with a pole ear (4); A cover plate (2), the cover plate (2) comprising a pole (201), a metal cover frame (202) and an insulating member (203); The metal cover frame (202) covers the opening and is connected to the shell (1), and a pole hole is provided through the metal cover frame (202); The pole (201) is inserted into the pole hole and connected to the pole lug (4); The insulating member (203) is wound around the circumference of the pole (201); A first connecting piece (2011) is provided on the outer side of the pole (201), a second connecting piece (2021) is provided on the inner side wall of the pole hole, and the insulating piece (203) is respectively connected to the first connecting piece (2011) and the second connecting piece (2021).

2. The battery according to claim 1, characterized in that The first connecting member (2011) is provided with a first through hole (20111), the second connecting member (2021) is provided with a second through hole (20211), a portion of the insulating member (203) is provided through the first through hole (20111), and another portion of the insulating member (203) is provided through the second through hole (20211).

3. The battery according to claim 1, characterized in that The first connecting member (2011) is a first connecting piece, the first connecting piece is extended along the circumference of the pole, and the second connecting member (2021) is a second connecting piece, the second connecting piece is extended along the circumference of the inner side wall of the pole hole; Alternatively, the first connecting member (2011) is a plurality of first bosses, which are evenly distributed around the pole; and the second connecting member (2021) is a plurality of second bosses, which are evenly distributed around the inner side wall of the pole hole.

4. The battery according to claim 1, characterized in that The pole (201) is a positive pole, and the insulating member (203) wound around the circumference of the positive pole is a conductive insulating member.

5. The battery according to claim 1, characterized in that The cover plate (2) is a first cover plate (21), one end of the shell (1) has the opening, and the first cover plate (21) covers the opening; The first cover plate (21) comprises two first poles (211) and a first metal cover frame (212); the two first poles (211) are located at two ends of the first metal cover frame (212) and are both insulated from the first metal cover frame (212).

6. The battery according to claim 1, characterized in that The cover plate (2) comprises two second cover plates (22); Both ends of the shell (1) have the openings, and the two second cover plates (22) respectively cover the two openings; The second cover plate (22) comprises a second pole (221) and a second metal cover frame (222); the second pole (221) and the second metal cover frame (222) are insulated from each other.

7. The battery according to claim 1, characterized in that The winding core (3) comprises a plurality of stacked pole pieces.

8. The battery according to claim 1, characterized in that The end of the pole away from the winding core (3) protrudes from the insulating member (203), and the height of the pole (201) protruding from the insulating member (203) is not less than 0.01 millimeters.

9. The battery according to claim 1, characterized in that The metal cover frame (202) is provided with a liquid injection hole (2022) penetrating therethrough, and the liquid injection hole (2022) is communicated with the accommodating cavity; and / or, The battery also includes an explosion-proof valve (5); The shell (1) or the metal cover frame (202) is provided with a pressure relief hole connected to the accommodating cavity, and the explosion-proof valve (5) is arranged on the shell (1) and covers the pressure relief hole, wherein the number of the explosion-proof valves (5) is greater than or equal to 2.

10. The battery according to claim 1, characterized in that The pole (201) is welded to the pole lug (4), and the area of ​​the orthographic projection of the welding portion of the pole (201) and the pole lug (4) is a first area, the area of ​​the orthographic projection of the cover plate (2) is a second area, and the ratio between the first area and the second area is 0.3 to 0.

9.

11. A battery pack, characterized in that: The battery pack comprises a battery as described in any one of claims 1-10.

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