Battery cover plate, battery, battery pack, and electrical device

Abstract

A battery cover plate, a battery, a battery pack, and an electrical device. The battery cover plate comprises a cover plate body. The cover plate body has a first surface and a second surface opposite to each other. A protrusion is provided on the second surface, and a recess is provided along the first surface, the bottom of the recess extending into the protrusion. The protrusion is used to be electrically connected to a tab of a battery. In this way, by means of vertically arranging the protrusion, electrical connection with the tab is facilitated, multiple bends of the tab are reduced, and close contact between the tab and the cover plate body is ensured, thereby reducing resistance, improving current transmission efficiency, and helping to prevent heat generation or damage caused by poor contact. Moreover, the extension of the bottom of the recess on the cover plate body into the protrusion helps to ensure that the protrusion is integral with the cover plate while maintaining structural strength. In addition, the recess further facilitates good heat dissipation, thereby lowering the temperature in the interior of the battery pack, prolonging the service life of the battery, and improving the safety of the battery.

Description

Battery cover plate, battery, battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 202411364473.X, filed on September 27, 2024, and entitled "Battery cover plate, battery, battery pack and electric device", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the technical field of batteries, in particular to a battery cover plate, a battery, a battery pack and an electric device. BACKGROUND

[0003] With the continuous progress of battery technology and the growing market demand, the performance of batteries in new energy battery vehicles is increasingly concerned, and the energy density and safety of batteries have become important indicators to measure the performance of batteries.

[0004] To protect the pole core and prevent the pole core short circuit problem caused by the shrinkage of the separator, the internal lug usually needs to be bent at an angle to meet the welding requirements. To improve the utilization rate of the internal space of the battery, multiple bending methods are used for the lug. However, the complex lug bending process not only increases the manufacturing cost, but also may introduce quality problems such as stress concentration and material damage during the bending process, which will adversely affect the performance and life of the battery. SUMMARY

[0005] The purpose of the present application is to provide a battery cover plate, a battery, a battery pack and an electric device, by adding a boss and a groove structure on the cover plate body to improve the strength of the cover plate body. The groove can absorb the deformation of the cover plate body caused by stress changes during welding or use, which leads to the failure of the internal sealing of the battery. In addition, the boss design can simplify the assembly of the lug, adopt a non-bent lug design and control the lug appearance, thereby reducing the possibility of short circuit of the battery and improving the overall performance and safety performance of the battery.

[0006] Embodiments of the present application aim to solve the above technical problems and provide the following technical solutions:

[0007] Firstly, the present application discloses a battery cover plate, comprising:

[0008] a cover plate body, the cover plate body has opposite first and second faces, the second face has a boss, and the first face has a groove, the groove bottom extends into the boss; the boss is used for electrical connection with the lug of the battery.

[0009] The battery cover plate provided by the embodiment of the present application comprises a cover plate body, the cover plate body has opposite first and second surfaces, the second surface has a boss, and the first surface has a groove, and the groove bottom extends into the boss. The boss is used for electrical connection with the tab of the battery. In this way, the boss facilitates electrical connection with the tab, reduces the multiple bending of the tab, ensures the close contact between the tab and the cover plate body, reduces the resistance, improves the current transmission efficiency, and helps prevent heating or damage caused by poor contact. Moreover, the groove bottom of the cover plate body extending into the boss is conducive to maintaining the structural strength while ensuring the integrity of the boss and the cover plate. In addition, the groove also helps form good heat dissipation, reduces the temperature inside the battery pack, and improves the service life and safety of the battery.

[0010] In a possible implementation, the side surface of the boss has a connecting area for connecting with the tab of the battery. In this way, the contact area of the electrical connection between the tab and the cover plate body is increased, which can be adjusted according to the actual length of the battery tab to meet the requirements of external laser penetration welding. This makes the cover plate body applicable to batteries of various models and specifications, improving the versatility and compatibility of the battery cover plate.

[0011] In a possible implementation, the minimum distance between the connecting area and the groove wall is d1, the minimum distance between the other side surface of the boss opposite to the connecting area and the groove wall is d2, and d2≤d1. In this way, the connecting area of the tab on the boss is limited to the side with a larger wall thickness, ensuring that there is sufficient material thickness to withstand thermal stress and mechanical stress during welding of the tab, preventing the tab from being penetrated by welding.

[0012] In a possible implementation, d1 and d2 satisfy d1≥0.1mm, and d1=0.8-B(mm), where B is the distance between the first surface and the second surface of the cover plate body. In this way, limiting the sizes of d1 and d2 can avoid the possibility of liquid leakage and abnormal sealing inside the battery caused by the thin wall thickness of the groove, as well as the unevenness of the cover plate body structure caused by the large difference in wall thickness between d1 and d2.

[0013] In a possible implementation, the height of the boss is h1, and h1 is between 8-16mm; and the height of the connecting area is h2, and h2 is between 4-12mm. In this way, limiting the height range of the boss can ensure that the boss has sufficient support, and limiting the height range of the connecting area on the boss can ensure that the tab is stably connected to the cover plate body, thereby enhancing the stability and reliability of the battery. Moreover, a reasonable size range can avoid installation interference or conflict between the boss and the connecting area and other components, ensuring smooth assembly of the components.

[0014] In a possible implementation, the cover plate body is connected to the insulating ring at one end and connected to the metal ring at the other end. The cover plate body is connected to the one end of the insulating ring by ceramic brazing, and the metal ring is connected to the other end of the insulating ring by ceramic brazing. The cover plate body and the metal ring are connected through the insulating ring, and the battery top cover is connected to the shell through the metal ring.

[0015] In a possible implementation, a connecting groove is arranged on the second surface of the cover plate body, the connecting groove is located at the outer edge of the second surface, and the top surface of the insulating ring is connected to the bottom surface of the connecting groove. Part of the inner side surface of the insulating ring abuts the side surface of the connecting groove. In this way, the assembly process can be simplified, the insulating ring is accurately positioned at the correct position of the cover plate body through the cooperation between the insulating ring and the connecting groove, and stable contact between the insulating ring and the cover plate body is ensured, which is beneficial to avoiding displacement of the insulating ring in the subsequent ceramic brazing process and causing sealing failure.

[0016] In a possible implementation, a first protrusion is further arranged on the outer side surface of the insulating ring, and the metal ring is sleeved on the insulating ring, and the top surface of the metal ring abuts the bottom surface of the first protrusion. In this way, the connection stability between the insulating ring and the metal ring can be ensured through the first protrusion, the assembly precision, the sealing performance, and the durability of the structure can be improved, and the assembly process is simplified, and the assembly precision and efficiency are improved.

[0017] In a possible implementation, along the width direction of the cover plate body, the width of the first protrusion is G1, and the horizontal distance between the connecting area of the boss and the outer side surface of the first protrusion is G2, and G2 is between 0.35G1 and 0.65G1. In this way, the position range of the protrusion in the stamping forming of the cover plate body can be limited, and the offset amount of the boss can be controlled. On the premise of not affecting the structural stability and forming quality of the cover plate body, the greater G2 is, the more conducive to the welding of the tab on the connecting area of the boss, which can reduce the space limitation in the welding process, so that the welding personnel can more flexibly operate the welding equipment and adjust the welding parameters, thereby obtaining better welding effect.

[0018] In a possible implementation, a second protrusion is arranged on the bottom surface of the metal ring, and the shell of the battery is arranged on the second protrusion, and the shell is connected to the metal ring. In this way, the second protrusion on the metal ring can serve as a support point for the battery shell, so that the top end opening of the shell is stably fixed on the second protrusion of the metal ring, which is conducive to positioning and identification during the subsequent welding between the shell and the metal ring, and displacement during the welding process is avoided.

[0019] In a possible implementation, the bottom surface of the metal ring is connected to the top surface of the shell, and the outer side surface of the second protrusion abuts against the inner side surface of the shell. In this way, the deformation of the connection between the battery shell and the metal ring caused by the external force collision of the battery during subsequent use can be effectively dispersed, the possibility of loosening or damage is reduced, and the stable operation of the battery is ensured.

[0020] In a possible implementation, the cover plate body is further provided with a first opening and a second opening, and the first opening and the second opening are located at two ends of the groove. In this way, the first opening and the second opening are connected to the cavity of the shell, and the explosion-proof valve and the liquid injection hole can be arranged on the first opening and the second opening respectively, so as to meet the use requirements of the battery.

[0021] In a second part, the application further discloses a battery, comprising:

[0022] a shell, the inside of the shell having a cavity;

[0023] at least one battery cover plate, the cover plate body of the battery cover plate being connected to at least one end of the shell, and the first opening and the second opening on the cover plate body being connected to the cavity;

[0024] an electric core, the electric core being located in the cavity, and at least one end of the electric core being provided with a tab, and the tab being electrically connected to the boss of the cover plate body.

[0025] In a possible implementation, the connecting area of the side surface of the boss is provided with a protective sheet, and the tab is electrically connected to the protective sheet. In this way, the stability and reliability between the tab and the connecting area of the boss of the battery can be improved, and the stress impact during the welding of the tab and the boss can be absorbed by the protective sheet, so as to avoid the welding of the boss.

[0026] In a possible implementation, the width of the electric core is L1, the horizontal distance between the outer surface of the electric core and the protective sheet is L2, and L2 is between 0.35L1 and 0.65L1. In this way, the position of the tab end can be controlled and limited, the internal structure of the battery can be reasonably optimized, the possibility of short circuit caused by improper position of the tab end can be avoided, and the performance and safety of the battery can be ensured.

[0027] In a possible implementation, when the electric core is connected to the outermost tab, the included angle between the outermost tab and the electric core is a, and a is between 20° and 90°. In this way, by limiting the included angle a of the outermost tab, the uniform distribution of current during transmission can be ensured, the energy loss caused by local overheating or excessive resistance can be reduced, and the overall performance of the battery can be improved.

[0028] In a possible implementation, a vertical distance between the bottom end of the protective sheet on the boss and the top end of the battery cell is H1; a length of the innermost tab from the battery cell to the connection with the protective sheet is H2 when the innermost tab is connected with the protective sheet, and H2≥H1.

[0029] In a possible implementation, the H1 and the H2 satisfy H1

[0030] In a possible implementation, the H1 and the H2 satisfy H1

[0031] The battery described above;

[0032] The battery can be a cylindrical battery, or a square battery, or a battery including a plurality of battery cells.

[0033] In a possible implementation, the battery pack includes:

[0034] The battery pack or the battery described above is used to provide electric energy for the electric device.

[0035] In addition to the technical problems solved by the present application, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features described above, other technical problems solved by the battery cover plate, the battery, the battery pack, and the electric device provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the drawings needed to be used in the embodiments of the present application or the background art will be described below.

[0037] FIG. 1 is a schematic diagram of a battery, a battery pack, and an electric device according to some embodiments of the present application;

[0038] FIG. 2 is a structural schematic diagram of a battery cover plate according to some embodiments of the present application;

[0039] FIG. 3 is an exploded view of a battery cover plate according to some embodiments of the present application;

[0040] FIG. 4 is a sectional view of a battery cover plate according to some embodiments of the present application;

[0041] FIG. 5 is a first schematic diagram of a connection of an outermost tab according to some embodiments of the present application;

[0042] Fig. 6 is a second schematic view of the connection of the outermost tab according to some embodiments of the present application.

[0043] Reference Signs List: 1 - electrical equipment; 11 - battery pack; 12 - battery; 100 - shell; 200 - battery cover plate; 300 - battery cell; 400 - tab; 110 - cavity; 210 - cover plate body; 220 - boss; 230 - groove; 240 - insulating ring; 250 - metal ring; 211 - first opening; 212 - second opening; 213 - connecting groove; 221 - protective sheet; 241 - first protrusion; 251 - second protrusion; 410 - outermost tab; 420 - innermost tab. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0045] Fig. 1 is a schematic view of a battery, a battery pack and an electrical equipment according to some embodiments of the present application, Fig. 2 is a structural schematic view of a battery cover plate according to some embodiments of the present application, Fig. 3 is an exploded view of the battery cover plate according to some embodiments of the present application, Fig. 4 is a sectional view of the battery cover plate according to some embodiments of the present application, Fig. 5 is a first schematic view of the connection of the outermost tab according to some embodiments of the present application, and Fig. 6 is a second schematic view of the connection of the outermost tab according to some embodiments of the present application.

[0046] Referring to Fig. 1, the embodiments of the present application provide an electrical equipment 1, which comprises an electrical device and a battery pack 11 or a battery. The battery pack 11 or the battery 12 provides electrical energy for the electrical device. For example, the electrical equipment 1 can be a vehicle or an energy storage device. When the electrical equipment 1 is a vehicle, the vehicle can be an electric vehicle, an electric car, a fuel vehicle or a hybrid vehicle. The electrical device can be an electric motor, a control system, a lighting system, etc. When the electrical equipment 1 is an energy storage device, the electrical device can be an inverter, a controller, etc. The battery pack 11 can comprise a plurality of batteries 12. In a possible implementation, the battery 12 can be a cylindrical battery, or the battery 12 can be a square battery, or the battery can have a plurality of battery cells inside. The plurality of batteries 12 can store and output electrical energy through a certain connection mode and a control system, and the battery pack 11 or the battery 12 can provide electrical energy for the electrical device to meet the normal operation of the equipment.

[0047] The battery cover plate 200 provided by the embodiments of the present application, as shown in FIGS. 2-4, includes a cover plate body 210 having opposite first and second faces, the second face having a boss 220, and the first face having a groove 230 with a groove bottom extending into the boss 220. The boss 220 is used to electrically connect with the tab 400 of the battery 12. In this way, the boss 220 is provided to facilitate electrical connection with the tab 400, reduce the number of bends of the tab 400, ensure close contact between the tab 400 and the cover plate body 210, reduce electrical resistance, improve current transmission efficiency, and help prevent heating or damage due to poor contact. Moreover, the groove 230 is provided on the cover plate body 210 with the groove bottom extending into the boss 220, which is conducive to maintaining structural strength while also ensuring the integrity of the boss 220 and the cover plate. In addition, the groove 230 also helps form good heat dissipation, reduces the temperature inside the battery pack 11, and improves the service life and safety of the battery 12.

[0048] In the embodiments of the present application, for ease of description, the length direction of the battery cover plate 200 is defined as the X direction, the width direction of the battery cover plate 200 is defined as the Y direction, and the height direction of the battery cover plate 200 is defined as the Z direction. In the Z direction, the battery cover plate 200 includes opposite first and second faces, with the first face defined in the positive direction of the Z axis and the second face defined in the negative direction of the Z axis. The boss 220 is provided on the second face and extends into the cavity 110 in the negative direction of the Z axis, ensuring electrical connection between the tab 400 and the cover plate body 210, achieving compactness of the structure of the battery cover plate 200, helping to save space inside the battery, and improving overall space utilization. The groove 230 increases the surface area of the cover plate body 210 while improving the strength of the cover plate body 210, which is conducive to welding the tab 400 and heat dissipation during subsequent use. It should be noted that the cover plate body 210 can be made of aluminum, but is not limited to aluminum, for example, it can also be made of steel or a metal conductive material that does not react with the electrolyte inside the battery.

[0049] In some embodiments of the present application, as shown in FIGS. 3 and 4, the side surface of the boss 220 has a connecting area for connecting with the tab 400 of the battery 12. In this way, the contact area of the electrical connection between the tab 400 and the cover plate body 210 is increased, which can be adjusted according to the actual length of the battery tab 400 to meet the requirements of external laser penetration welding. This allows the cover plate body 210 to be applicable to batteries of various models and specifications, improving the versatility and compatibility of the battery cover plate 200.

[0050] It can be understood that the connecting area is arranged on the side of the boss 220, which increases the contact area between the cover plate body 210 and the tab 400, helps to disperse the contact pressure of the tab 400, and reduces the possibility of damage to the tab 400 caused by local overheating or stress concentration during the welding process and subsequent use. And the larger contact area also helps to optimize the distribution of current between the tab 400 and the cover plate body 210, reduce resistance and heat generation, and thus improve the overall performance and life of the battery pack.

[0051] In one possible implementation, the boss 220 and the cover plate body 210 can be designed as a whole. When the boss 220 with the groove 230 is punched on the cover plate body 210 using an integrated punching technology, the above design can be used, but it is not limited to the above design. For example, it can also not be designed as a whole, and the boss 220 with the groove 230 can be welded to the second surface of the cover plate body 210. It can be understood that when the boss 220 with the groove 230 is integrally punched and formed on the cover plate body 210, the boss 220 and the cover plate body 210 are of an integrated structure, and the overall structural strength of the cover plate body 210 is higher, which can reduce the possibility of failure caused by poor welding.

[0052] In some embodiments of the present application, referring to FIG. 4, the minimum distance between the connecting area and the groove wall of the groove 230 is d1, the minimum distance between the other side of the boss 220 opposite to the connecting area and the groove wall of the groove 230 is d2, and d2≤d1. d1 and d2 satisfy d1≥0.1mm, and d1=0.8-B(mm), B is the distance between the first surface and the second surface of the cover plate body 210. In this way, the connecting area of the tab 400 on the boss 220 is limited to the side with a larger wall thickness, which ensures that there is enough material thickness to withstand thermal stress and mechanical stress during welding of the tab 400, preventing the tab 400 from being welded through the boss 220. It can be understood that limiting the size of d1 and d2 can also avoid the possibility of liquid leakage and abnormal sealing in the battery caused by the thin wall thickness of the groove 230, as well as the unevenness of the structure of the cover plate body 210 caused by the large difference in the wall thickness of d1 and d2.

[0053] The minimum distance between the connecting area and the groove wall of the groove 230, i.e. the distance between the position where the tab 400 is located when welding and the inner wall of the groove 230, is d1, which is limited to d1 = 0.8-B (mm), where B is the distance between the first face and the second face of the cover plate body 210, i.e. the thickness of the cover plate body 210 along the Z-axis direction. It is ensured that d1 has a sufficient size, and the connecting area has a sufficient material thickness to withstand welding stress and mechanical stress, so that the welding can effectively prevent the welding from penetrating the boss 220, thereby ensuring the welding quality and the safety of the battery 12. In a possible implementation, to ensure the reliability of the welding, a protective sheet 221 can also be arranged on the connecting area, and the tab 400 and the boss 220 of the cover plate body 210 are connected through the protective sheet 221.

[0054] The minimum distance between the other side of the boss 220 opposite to the connecting area and the groove wall of the groove 230 is d2, and d2≤d1. To ensure the structural strength of the boss 220 of the cover plate body 210, d2 needs to have a sufficient size, so as to avoid that the boss 220 has a reduced structural strength due to a large size difference between d1 and d2, and becomes a weak point of the structure of the cover plate body 210, which is easy to be deformed or broken under the influence of external pressure or impact. It can be understood that in a possible implementation, d1 can be equal to d2, to avoid the structural non-uniformity of the cover plate body 210 caused by the size difference of the wall thickness. The manufacturing process is also simplified, and different size standards do not need to be set for d1 and d2, thereby reducing the production cost and manufacturing difficulty.

[0055] In some embodiments of the present application, please continue to refer to FIG. 4, the height of the boss 220 is h1, and h1 is between 8-16 mm, for example, which can be 8 mm, 11 mm, 13.5 mm, 14.5 mm or 16 mm, etc. The height of the connecting area is h2, and h2 is between 4-12 mm, for example, which can be 4 mm, 6.5 mm, 8.5 mm or 12 mm, etc. In this way, limiting the height range of the boss 220 can ensure that the boss 220 can ensure sufficient support force, and limiting the height range of the connecting area on the boss 220 can ensure that the tab 400 is stably connected to the cover plate body 210, thereby enhancing the stability and reliability of the battery 12. And a reasonable size range can avoid installation interference or conflict between the boss 220 and the connecting area and other components, to ensure that the components can be smoothly assembled.

[0056] In some embodiments of the present application, as shown in Figures 2 to 4, an insulating ring 240 and a metal ring 250 are further included, the insulating ring 240 is sleeved on the boss 220, one end of the insulating ring 240 is connected with the cover plate body 210, and the other end of the insulating ring 240 is connected with the metal ring 250. In this way, the cover plate body 210 and one end of the insulating ring 240 are connected by ceramic brazing, the metal ring 250 and the other end of the insulating ring 240 are connected by ceramic brazing, the cover plate body 210 and the metal ring 250 are connected through the insulating ring 240, and the battery top cover is connected with the shell 100 through the metal ring 250.

[0057] The insulating ring 240 is located between the cover plate body 210 and the metal ring 250, and can play a role of isolation and insulation to prevent safety hazards such as short circuit or electric leakage inside the battery. In addition, the insulating ring 240 has sufficient mechanical strength and can also withstand the vibration and impact that may be generated during the operation of the battery. It should be noted that the insulating ring 240 can be made of ceramic material, but is not limited to ceramic material, for example, other insulating materials such as PPS injection material and glass material can also be used. Moreover, the top end of the insulating ring 240 is connected with the cover plate body 210, the insulating ring 240 is sleeved on the boss 220 of the cover plate body 210, so that the boss 220 on the cover plate body 210 can extend into the cavity 110 of the shell 100, which is conducive to compressing the space volume inside the battery on the basis of ensuring the reliability and safety of the battery, so that the inside of the battery is more integrated and compact. After the tab 400 of the cell 300 is led out, it is connected with the boss 220 of the cover plate body 210, and the leading position of the cell 300 and the tab 400 can be wound with an insulating film or an insulating tape (not shown in the figure), so as to prevent the cell 300 and the tab 400 from contacting the shell 100 and the metal ring 250 to cause short circuit inside the battery.

[0058] When the cell 300 is packaged and welded, the metal ring 250 is located between the insulating ring 240 and the shell 100, the metal ring 250 serves as a connecting piece between the cover plate body 210 and the shell 100, and can form a sealing barrier and enhance the structural strength of the battery top cover by using the metal ring 250, so as to ensure that the heat generated during welding can be transmitted and dissipated through the metal ring 250, thereby avoiding damage to the insulating ring 240 and the cover plate body 210 due to excessive temperature during ceramic brazing, and even causing damage to the tab 400 or the insulating film or insulating tape wrapped outside the tab 400. It should be noted that the metal ring 250 can be made of the same metal material as the battery shell 100, and is preferably made of aluminum, but is not limited to aluminum, for example, steel or a metal conductive material that does not react with the electrolyte inside the battery can also be used.

[0059] In some embodiments of the present application, as shown in FIGS. 2-4, the second surface of the cover plate body 210 is provided with a connecting groove 213 located at the outer edge of the second surface, and the top surface of the insulating ring 240 is connected to the bottom surface of the connecting groove 213. Part of the inner side surface of the insulating ring 240 abuts the side surface of the connecting groove 213. In this way, the assembly process can be simplified, and the insulating ring 240 is accurately positioned on the correct position of the cover plate body 210 through the cooperation between the insulating ring 240 and the connecting groove 213, ensuring stable contact between the insulating ring 240 and the cover plate body 210, which is conducive to avoiding displacement of the insulating ring 240 during subsequent ceramic brazing, leading to sealing failure, etc.

[0060] The connecting groove 213 is located on the outer edge of the second surface of the cover plate body 210, which is conducive to increasing the contact area between the top surface of the insulating ring 240 and the bottom surface of the cover plate body 210, and part of the inner side surface of the insulating ring 240 abuts the side surface of the connecting groove 213. The stability and sealing between the insulating ring 240 and the cover plate body 210 are enhanced, which is conducive to subsequent welding positioning and avoids the possibility of misalignment during assembly or use. The ceramic brazing technology is used to connect the cover plate body 210 and the insulating ring 240 to prevent loosening or falling off during subsequent battery use, leading to sealing failure. It should be noted that the groove 230 can be realized by an integrated stamping forming technology on the second surface of the cover plate body 210.

[0061] In some embodiments of the present application, as shown in FIGS. 3, 4-6, the outer side surface of the insulating ring 240 is further provided with a first protrusion 241, and the metal ring 250 is sleeved on the insulating ring 240, and the top surface of the metal ring 250 abuts the bottom surface of the first protrusion 241. In this way, the connection stability between the insulating ring 240 and the metal ring 250 can be ensured through the first protrusion 241, which can improve the assembly precision, sealing performance and structural durability, not only simplifying the assembly process, but also improving the assembly precision and efficiency. It can be understood that enhancing the connection stability also helps to improve the sealing effect of the entire structure, which can prevent liquid, gas or dust from entering the inside of the battery during subsequent use, effectively blocking the influence of the external environment, protecting the internal structure from damage, helping to prolong the service life of the equipment, reduce maintenance costs, and improve overall economic benefits.

[0062] In some embodiments of the present application, as shown in FIG. 4, the width of the first protrusion 241 along the width direction of the cover plate body 210 is G1. The horizontal distance between the connecting area of the boss 220 and the outer side surface of the first protrusion 241 is G2, and G2 is between 0.35G1 and 0.65G1. In this way, the position range of the protrusion in the stamping forming of the cover plate body 210 can be limited, and the offset amount of the boss 220 can be controlled. On the premise of not affecting the structural stability and forming quality of the cover plate body 210, the larger G2 is, the more conducive it is to the welding of the tab 400 on the connecting area of the boss 220, which can reduce the space limitation that may be encountered during welding, so that the welding personnel can operate the welding equipment more flexibly and adjust the welding parameters, thereby obtaining better welding effect.

[0063] It can be understood that, under the premise of ensuring the overall structural stability of the cover plate body 210, the setting of G2 has a certain flexibility. A smaller G2 makes the connecting area of the boss 220 closer to the insulating ring 240, which is conducive to reducing material waste and reducing weight, making the space utilization inside the battery larger and more integrated, but may require higher processing and assembly precision. A larger G2 provides more space for the connecting area of the boss 220, which is conducive to reducing the connection difficulty between the tab 400 and the connecting area of the boss 220 and improving the assembly efficiency. It should be noted that the distance limit between G1 and G2 can be determined according to the actual working condition, and when the offset amount of the boss 220 is too large or too small, the possibility of short circuit of the outermost tab 410 (the tab 400 close to the inner wall of the shell 100) may occur.

[0064] In some embodiments of the present application, as shown in FIGS. 3, 4 to 6, the bottom surface of the metal ring 250 is provided with a second protrusion 251, the shell 100 of the battery 12 is arranged on the second protrusion 251, and the shell 100 is connected with the metal ring 250. The bottom surface of the metal ring 250 is connected with the top surface of the shell 100, and the outer side surface of the second protrusion 251 abuts against the inner side surface of the shell 100.

[0065] The second protrusion 251 on the metal ring 250 can serve as a support point for the battery shell 100, so that the top end opening of the shell 100 is stably fixed on the second protrusion 251 of the metal ring 250, which is conducive to positioning and identification during subsequent welding between the shell 100 and the metal ring 250, and avoids displacement during welding. The abutment between the bottom surface of the metal ring 250 and the top surface of the shell 100, and between the outer side surface of the second protrusion 251 and the inner side surface of the shell 100, achieves double connection, which can effectively disperse the deformation of the connection between the battery shell 100 and the metal ring 250 caused by external force collision during subsequent use of the battery, reduce the possibility of loosening or damage, and ensure stable operation of the battery 12.

[0066] Further welding the metal ring 250 to the shell 100 can also ensure the sealing of the battery 12, and the close fit between the shell 100 and the second protrusion 251 can further effectively prevent harmful substances such as moisture and dust in the external environment from entering the battery, and also prevent the leakage of substances such as electrolyte in the battery to the external environment, thereby prolonging the service life of the battery 12.

[0067] In some embodiments of the present application, as shown in FIGS. 2 and 3, the cover plate body 210 is further provided with a first opening 211 and a second opening 212, which are respectively located at the two ends of the groove 230. In this way, the first opening 211 and the second opening 212 are in communication with the cavity 110 of the shell 100, and an explosion-proof valve and a liquid injection hole can be respectively arranged on the first opening 211 and the second opening 212.

[0068] For example, an explosion-proof valve can be arranged on the first opening 211, which is used to automatically open when the internal pressure of the battery abnormally rises (such as due to overcharging, short circuit, thermal runaway, etc.), so as to release the internal pressure of the cavity 110, thereby preventing the battery from exploding or rupturing, and effectively reducing the possibility of damage to the battery under extreme conditions. Electrolyte can be injected into the cavity 110 of the shell 100 through the second opening 212, and the electrolyte reacts with the battery cells 300 in the cavity 110 to generate electrical energy.

[0069] The present application provides a battery, as shown in FIGS. 5 and 6, which includes a shell 100, and the shell 100 has a cavity 110 inside. At least one battery cover plate 200 described above is connected to at least one end of the shell 100, and the first opening 211 and the second opening 212 on the cover plate body 210 are in communication with the cavity 110. The battery cells 300 are located in the cavity 110, and at least one end of the battery cells 300 is provided with a plurality of tabs 400, and the tabs 400 are electrically connected to the boss 220 of the cover plate body 210.

[0070] In one possible implementation, one end of the shell 100 is connected to the battery cover plate 200 of the present embodiment, and the other end of the shell 100 is not limited. In another possible implementation, both ends of the shell 100 are connected to the battery cover plate 200 of the present embodiment, and the first opening 211 and the second opening 212 are arranged on one of the battery cover plates 200.

[0071] It can be understood that the shell 100 wraps and fixes the battery cell 300 and the tab 400, preventing the battery cell 300 and the tab 400 from being mechanically damaged by external vibration, impact, etc. The battery cover plate 200 is used to seal the battery cell 300 and the tab 400 in the cavity 110 of the shell 100. Through the close cooperation of the battery cover plate 200 and the shell 100, it can be ensured that the battery cell 300 and the tab 400 work in a sealed environment, effectively preventing electrolyte leakage or external gas and liquid intrusion, thereby ensuring the integrity and stability of the internal structure of the battery.

[0072] It should be noted that the shell 100, the cover plate body 210 and the metal ring 250 of the battery 12 can be made of metal, preferably aluminum, but are not limited to aluminum, for example, steel or a metal conductive material that does not react with the electrolyte inside the battery. The shell 100, the battery cover and the metal ring 250 of the battery 12 can be made of the same metal material, or different metal materials, which will not be described here.

[0073] In some embodiments of the present application, as shown in FIGS. 4-6, the connecting area on the side surface of the boss 220 is provided with a protective sheet 221, and the tab 400 is electrically connected with the protective sheet 221. In this way, the stability and reliability between the tab 400 of the battery 12 and the connecting area of the boss 220 can be improved. By adding the protective sheet 221, the stress impact during welding of the tab 400 and the boss 220 can be absorbed, and the boss 220 can be prevented from being welded through.

[0074] The protective sheet 221 serves as an electrical connection medium between the tab 400 and the boss 220, provides an additional electrical barrier, and ensures that the current will not leak or short circuit during transmission due to accidental circumstances. In addition, the protective sheet 221 can also provide physical protection for the tab 400. During the subsequent use of the battery 12, the battery may be affected by external factors such as vibration and impact. The protective sheet 221 can absorb these impact forces and vibration forces to protect the tab 400 from being damaged, thereby prolonging the service life of the battery 12.

[0075] In some embodiments of the present application, as shown in FIGS. 5 and 6, the width of the battery cell 300 is L1. The horizontal distance between the outer surface of the battery cell 300 and the protective sheet 221 is L2, and L2 is between 0.35L1 and 0.65L1. In this way, the position of the tab 400 can be controlled and limited, the internal structure of the battery can be reasonably optimized, the possibility of battery short circuit caused by improper position of the tab 400 can be avoided, and the performance and safety of the battery 12 can be ensured.

[0076] In some embodiments of the present application, as shown in FIGS. 5 and 6, when the electrode tab 300 is connected with the outermost electrode tab 410, the included angle between the outermost electrode tab 410 and the electrode tab 300 is a, and a is between 20° and 90°, for example, can be 20°, 35°, 55°, 70° or 90°, etc. The included angle a between the outermost electrode tab 410 and the electrode tab 300 can be limited according to the actual working condition. In this way, by limiting the included angle a of the outermost electrode tab 410, the uniform distribution of current during transmission can be ensured, and the energy loss caused by local overheating or excessive resistance can be reduced, thereby improving the overall performance of the battery 12. And the appropriate included angle a is also conducive to the stability and integration of the internal structure of the battery.

[0077] It can be understood that too large included angle a can increase the stress concentration of the electrode tab 400 under vibration or impact, causing the electrode tab 400 to break or fall off. Moreover, too large included angle a occupies a larger space and has a poor space utilization rate. Too small included angle a can cause the electrode tab 300 to short circuit.

[0078] It should be noted that the outermost electrode tab 410 is the main connection point between the battery and the external circuit, and the design of the included angle of the outermost electrode tab 410 directly affects the transmission efficiency and distribution of the current. By limiting the included angle of the outer electrode tab 400, the uniformity of the current during transmission can be ensured, and the energy loss caused by local overheating or excessive resistance can be reduced. The inner electrode tab 400 is inside the battery, and its included angle has less direct impact on external current transmission. As shown in FIGS. 5 and 6, when the outermost electrode tab 410 is away from the electrode tab 300 and is in a slightly curved state, the included angle a increases, and the possibility of short circuit of the electrode tab 300 is low, and the appearance of the electrode tab 400 is better. It can be understood that when the outermost electrode tab 410 is towards the electrode tab 300 and is in a slightly curved state, the included angle a is small, and the possibility of additional contact between the electrode tab 400 and the electric wire increases, which is easy to cause internal short circuit of the battery.

[0079] In some embodiments of the present application, as shown in FIGS. 5 and 6, the vertical distance between the bottom end of the protective sheet 221 on the boss 220 and the top end of the electrode tab 300 is H1. When the innermost electrode tab 420 is connected with the protective sheet 221, the length between the innermost electrode tab 420 leading out from the electrode tab 300 and being connected with the protective sheet 221 is H2, and H2≥H1. H1 and H2 satisfy H1

[0080] It can be understood that the effective bending space height of the tab 400 in the cavity 110 in the direction of the Z axis is defined as H1. The effective bending length of the innermost tab 420 is defined as H2 (not shown in the figure, H2 is the actual length of the innermost tab 420 after being drawn out from the battery cell 300). When the effective bending space height is greater than the effective bending length of the tab 400, i.e. H1>H2, the effective bending length of the tab 400 cannot meet the effective bending space height, and the innermost tab 420 cannot be electrically connected with the boss 220 of the cover plate body 210. When the effective bending space height is equal to the effective bending length of the tab 400, i.e. H1=H2, the tab 400 is in a tight state after being drawn out from the battery cell 300 and electrically connected with the boss 220 of the cover plate body 210, and there is a possibility of connection failure due to material fatigue in the subsequent use of the battery 12.

[0081] When the effective bending space height is less than the effective bending length of the tab 400, i.e. H1<H2, the reliability of the connection between the tab 400 and the boss 220 of the cover plate body 210 can be ensured. It should be noted that when the effective bending length of the tab 400 is too long, it will cause waste of material and unnecessary space occupation, and even cause the tab 400 to possibly insert or extrude the battery cell 300. Limiting H1<H2≤1.8H1 avoids the tab 400 being too long to generate excessive stress in the bending process, affecting the stability of the connection and the overall performance of the battery 12.

[0082] Wherein, the terms such as "upper", "lower" and the like are used to describe the relative positional relationship of various structures in the drawings, and are only for the convenience of clear description, and do not limit the scope of the application. Changes or adjustments of the relative relationship are also considered as the scope of the application without substantial changes in technical content.

[0083] It should be noted that: in the present application, unless otherwise specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly contacted through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0084] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0085] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover plate, comprising: a cover plate body (210) having opposite first and second faces, the second face having a boss (220) thereon, and a groove (230) along the first face, a groove bottom of the groove (230) extending into the boss (220); the boss (220) is used for electrically connecting with a tab (400) of a battery (12).

2. The battery cover plate of claim 1, wherein, a side face of the boss (220) has a connecting area used for connecting with the tab (400) of the battery (12).

3. The battery cover plate of claim 2, wherein, a minimum distance between the connecting area and a groove wall of the groove (230) is d1, a minimum distance between another side face of the boss (220) opposite to the connecting area and the groove wall of the groove (230) is d2, and d2≤d1.

4. The battery cover plate of claim 3, wherein, the d1 and the d2 satisfy d1≥0.1mm, and d1=0.8-B (mm), B being a distance between the first face and the second face of the cover plate body (210).

5. The battery cover plate of claim 4, wherein, a height of the boss (220) is h1, and h1 is between 8-16mm; a height of the connecting area is h2, and h2 is between 4-12mm.

6. The battery cover plate of any one of claims 2-5, wherein, an insulating ring (240) and a metal ring (250) are further included, one end of the insulating ring (240) being connected with the cover plate body (210), and the other end of the insulating ring (240) being connected with the metal ring (250).

7. The battery cover plate of claim 6, wherein, a connecting groove (213) is arranged on the second face of the cover plate body (210), the connecting groove (213) being located at an outer edge of the second face, and a top face of the insulating ring (240) being connected with a bottom face of the connecting groove (213) ; and a part of an inner side face of the insulating ring (240) abutting against a side face of the connecting groove (213).

8. The battery cover plate of any of claims 6-7, wherein, a first protrusion (241) is further arranged on an outer side face of the insulating ring (240), the metal ring (250) being sleeved on the insulating ring (240), and a top face of the metal ring (250) abutting against a bottom face of the first protrusion (241).

9. The battery cover plate of claim 8, wherein, a width of the first protrusion (241) is G1 along a width direction of the cover plate body (210) ; a horizontal distance between the connecting area of the boss (220) and an outer side face of the first protrusion (241) is G2, and G2 is between 0.35G1-0.65G1.

10. The battery cover plate of any of claims 7-9, wherein, a second protrusion (251) is arranged on a bottom face of the metal ring (250), an outer shell (100) of the battery (12) being sleeved on the second protrusion (251), and the outer shell (100) being connected with the metal ring (250).

11. The battery cover plate of claim 10, wherein, the bottom face of the metal ring (250) is connected with a top face of the outer shell (100), and an outer side face of the second protrusion (251) abutting against an inner side face of the outer shell (100).

12. The battery cover plate of claim 11, wherein, a first opening (211) and a second opening (212) are further arranged on the cover plate body (210), the first opening (211) and the second opening (212) being respectively located at two ends of the groove (230). 13.A battery, comprising: An outer shell (100) having a cavity (110) inside; At least one battery cover plate (200) according to any one of claims 1-12, wherein the cover plate body (210) of the battery cover plate (200) is connected to at least one end of the outer shell (100), and the first opening (211) and the second opening (212) on the cover plate body (210) are connected to the cavity (110); An electric core (300) located in the cavity (110), and at least one end of the electric core (300) is provided with a tab (400) which is electrically connected to the boss (220) of the cover plate body (210).

14. The battery of claim 13, wherein, A protective sheet (221) is arranged on the connecting area of the side surface of the boss (220), and the tab (400) is electrically connected to the protective sheet (221).

15. The battery of claim 14, wherein, The width of the electric core (300) is L1; The horizontal distance between the outer surface of the electric core (300) and the protective sheet (221) is L2, and L2 is between 0.35L1 and 0.65L1.

16. The battery of claim 15, wherein, When the outermost tab (410) is connected to the electric core (300), the included angle between the outermost tab (410) and the electric core (300) is α, and α is between 20° and 90°.

17. The battery of claim 16, wherein, The vertical distance between the bottom end of the protective sheet (221) on the boss (220) and the top end of the electric core (300) is H1. When the innermost tab (420) is connected to the protective sheet (221), the length of the innermost tab (420) from the electric core (300) to the connection with the protective sheet (221) is H2, and H2≥H1.

18. The battery of claim 17, wherein, The H1 and the H2 satisfy H1 19. A battery pack, comprising: The battery (12) according to any one of claims 13-18; The battery (12) can be a cylindrical battery, or a square battery, or a battery comprising a plurality of electric cores (300).

20. An electrical device, comprising: An electrical device, and the battery pack (11) according to claim 19 or the battery (12) according to any one of claims 13-18, wherein the battery pack (11) or the battery (12) is used to provide electrical energy for the electrical device.

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