Cover plate device, battery and electric equipment

Abstract

The utility model provides a cover plate device, a battery and electric equipment, and relates to the technical field of batteries, a first end of a cover plate body in the cover plate device is used for being electrically connected with a tab of one of two adjacent battery cells, and a second end of the cover plate body is used for being electrically connected with a tab of the other of the two adjacent battery cells. The first assembly is arranged at the first end of the cover plate body and connected with the first end, the first assembly is used for being connected with a shell of one of the two adjacent battery cells, the second assembly is arranged at the second end of the cover plate body and connected with the second end, and the second assembly is connected with a shell of the other battery cell of the two adjacent battery cells. According to the cover plate device provided by the embodiment of the invention, the welding assembly process of the cover plate assembly between the two adjacent battery cells can be avoided, the assembly efficiency between the battery cells is improved, and the assembly efficiency of the battery is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover device, a battery, and an electrical device. Background Art

[0002] Batteries are the primary functional components of electrical devices. Their performance directly impacts the performance of these devices. For example, battery power consumption, heat generation, and size all affect the performance of these devices.

[0003] Batteries are generally composed of multiple cells, which are connected in series or in parallel. Cells can be connected by welding the terminals together to form a battery.

[0004] However, the connection efficiency between the battery cells in the above-mentioned related art is low, which reduces the assembly efficiency of the battery. Utility Model Content

[0005] The embodiments of the present application provide a cover device, a battery, and an electrical device, which are used to solve the technical problem in the above-mentioned related art that the connection efficiency between two battery cells is low, thereby reducing the assembly efficiency of the battery.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a cover device, comprising:

[0008] The cover body includes a first end and a second end, wherein the first end is used to electrically connect to the tab of one of the two adjacent battery cells, and the second end is used to electrically connect to the tab of the other of the two adjacent battery cells;

[0009] a first component, the first component being disposed at the first end of the cover body and connected to the first end, the first component being used to be connected to a housing of one of the two adjacent battery cells;

[0010] The second component is arranged at the second end of the cover body and connected to the second end, and the second component is connected to the shell of the other battery cell of the two adjacent battery cells.

[0011] The present invention provides a cover plate device comprising a cover plate body, a first component, and a second component. The cover plate body replaces the pole in the prior art to electrically connect the tabs on two adjacent battery cells. The cover plate body is connected to the two adjacent battery cells through the first component and the second component, thereby avoiding the welding assembly process of the cover plate assembly between the two adjacent battery cells, improving the assembly efficiency between the battery cells, and further improving the assembly efficiency of the battery.

[0012] Furthermore, by using the cover body to electrically connect the tabs on two adjacent battery cells, the use of poles to connect the tabs can be avoided, and since the surface area of ​​the cover body is larger than the surface area of ​​the pole in the prior art, the current carrying capacity of the cover body can be improved, the power loss at the cover body can be reduced, and thus the power consumption of the battery can be reduced.

[0013] In a possible implementation, in a thickness direction of the cover plate body, a maximum distance between the first end and the second end of the cover plate body is greater than or equal to 1 mm.

[0014] In this way, by making the distance from the first end to the second end on the cover body greater than or equal to 1 mm, it is possible to avoid deformation or penetration of the cover body when the tab is welded to the cover body, thereby improving the durability of the cover body and the yield of the cover device, and improving the success rate of welding between the cover device and the tab.

[0015] In a possible implementation, the first component includes a first insulating member;

[0016] The first insulating member is used to insulate between the cover body and the shell of one of the two adjacent battery cells.

[0017] In this way, the first assembly includes the first insulating member, so that the cover body is connected to the battery cell shell through the first insulating member, thereby avoiding electrical connection between the cover body and the battery cell shell and causing a short circuit.

[0018] and / or, the second component includes a second insulating member;

[0019] The second insulating member is used to insulate the cover plate body from the shell of the other battery cell among the two adjacent battery cells.

[0020] In this way, the second assembly includes the second insulating member, so that the cover body is connected to the battery cell shell through the second insulating member, thereby avoiding electrical connection between the cover body and the battery cell shell and causing a short circuit.

[0021] In a possible implementation, the outer peripheral side of the first insulating member has a first flange;

[0022] In this way, by arranging the first flange on the outer peripheral side of the first insulating part, the first connecting surface of the first flange can be made to abut the end of the shell of the battery cell, so as to limit the height direction of the shell of the battery cell by the first flange, thereby improving the connection stability between the first component and the battery cell and limiting the displacement of the shell of the battery cell in the height direction.

[0023] The thickness of the first flange is greater than or equal to 0.4 mm.

[0024] In this way, by making the thickness of the first flange greater than or equal to 0.4 mm, the thickness of the first flange can be avoided from being too thin. For example, when the thickness of the first flange is 0.1 mm, it is easy to cause damage to the first flange and easily cause the first flange to crack during the welding process.

[0025] In a possible implementation, the outer peripheral side of the second insulating member has a second flange;

[0026] In this way, by arranging a second flange on the outer peripheral side of the second insulating part, the second connecting surface of the second flange can be made to abut the end of the shell of the battery cell, so as to limit the height direction of the shell of the battery cell by the second flange, thereby improving the connection stability between the second component and the battery cell and limiting the displacement of the shell of the battery cell in the height direction.

[0027] The thickness of the second flange is greater than or equal to 0.4 mm.

[0028] In this way, by making the thickness of the second flange greater than or equal to 0.4 mm, the thickness of the second flange can be avoided from being too thin. For example, when the thickness of the second flange is 0.1 mm, it is easy to cause damage to the second flange and easily cause the second flange to crack during the welding process.

[0029] In a possible implementation, the first insulating member has a first through hole, and the second insulating member has a second through hole;

[0030] The cover body includes a third flange, the third flange is pressed between two opposite end surfaces of the first insulating member and the second insulating member, and covers the first through hole and the second through hole;

[0031] The area on the cover body corresponding to the first through hole and / or the second through hole is used to be electrically connected to the tab of the battery cell.

[0032] In this way, by opening a first through hole on the first insulating member and pressing the third flange on the cover body against the two opposite end faces of the first insulating member and the second insulating member, the first insulating member and the second insulating member can be limited in the height direction of the battery cell, and the displacement of the cover body in its thickness direction can be limited, thereby improving the structural compactness of the cover device.

[0033] Furthermore, since the third flange is provided on the outer peripheral side of the cover body, the cross-sectional inertia moment of the cover body is increased, thereby improving its bending resistance, thereby increasing the overall rigidity of the cover body and making it less likely to deform when subjected to external force.

[0034] The third flange can also help disperse and redistribute the stress applied to the cover plate body, reduce stress concentration points, and thus reduce the risk of local failure.

[0035] In addition, by extending the tabs into the first through hole and / or the second through hole, and electrically connecting the areas of the cover body corresponding to the first through hole and / or the second through hole to the tabs on two adjacent battery cells, compared to the prior art method of extending the poles into the battery cell housing and then electrically connecting to the tabs, the cover body can be prevented from occupying a large space inside the housing, reducing the space occupied by the cover assembly inside the battery cell housing, and increasing the internal capacitance of the battery cell while maintaining the same cell volume. Alternatively, while ensuring that the capacitance remains unchanged, the length of the battery cell can be reduced, thereby facilitating a reduction in the volume of the battery.

[0036] In a possible implementation, along the radial direction of the first through hole, a distance from an outer edge of the third flange to an outer edge of the first flange is h1;

[0037] The surface of the first flange facing away from the second flange is a first connecting surface;

[0038] A distance from the first connecting surface of the first flange to an end surface of the first insulating member facing the cover body is h2, and h1+h2≥1.6 mm.

[0039] In this way, a sufficiently long creepage distance can be ensured between the cover body and the shell of one of the two adjacent battery cells, thereby avoiding high-voltage breakdown between the battery cell and the cover body and improving the safety of the battery.

[0040] In a possible implementation, along the radial direction of the second through hole, a distance from an outer edge of the third flange to an outer edge of the second flange is h3;

[0041] The surface of the second flange facing away from the first flange is a second connecting surface;

[0042] A distance from the second connecting surface of the second flange to an end surface of the second insulating member facing the cover body is h4, and h3+h4≥1.6 mm.

[0043] Similarly, in this way, a sufficiently long creepage distance can be ensured between the cover body and the shell of the other of the two adjacent battery cells, thereby avoiding high-voltage breakdown between the battery cell and the cover body and improving the safety of battery use.

[0044] In a possible implementation, the first component further includes a first metal ring, which is disposed on an outer circumference of the first insulating member and connected to the first flange surface;

[0045] The first metal ring is used to be connected to the shell of one of the two adjacent battery cells.

[0046] In this way, by using the first metal ring to weld the first insulating member and the shell of one of the two adjacent battery cells, the problem of shell welding damage caused by the melting point of the first insulating member being higher than the shell when the first insulating member is directly welded to the shell of the battery cell can be avoided, thereby improving the weldability between the cover device and the shell of the battery cell.

[0047] And / or, the second component further includes a second metal ring, which is arranged on the outer periphery of the second insulating member and connected to the second flange;

[0048] The second metal ring is used to be connected to the shell of the other battery cell among the two adjacent battery cells.

[0049] In this way, by using a second metal ring to weld the second insulating member and the shell of the other of the two adjacent battery cells, the problem of shell welding damage caused by the melting point of the second insulating member being higher than the shell when the second insulating member is directly welded to the shell of the battery cell can be avoided, thereby improving the weldability between the cover device and the shell of the battery cell.

[0050] A second aspect of the present invention provides a battery comprising

[0051] A plurality of battery cells are arranged along a first direction, and each of the battery cells includes a shell and a tab located in the shell;

[0052] and the cover plate device as described above, wherein the cover plate device is located between two adjacent battery cells;

[0053] The first end of the cover plate body in the cover plate device is electrically connected to the tab of one of the two adjacent battery cells, and the second end of the cover plate body in the cover plate device is electrically connected to the tab of the other of the two adjacent battery cells;

[0054] The first component of the cover plate device is connected to the shell of one of the two adjacent battery cells, and the second component of the cover plate device is connected to the shell of the other of the two adjacent battery cells.

[0055] In this way, by connecting the ends of two connected battery cells using the above-mentioned cover plate device, a plurality of battery cells can be assembled, thereby improving the assembly efficiency of the battery, reducing the power consumption of the battery, and reducing the heat generation of the battery.

[0056] In a possible implementation, the battery cell further includes an end cover, wherein the end cover is provided at the end of the outermost battery cell in the first direction.

[0057] In this way, by providing an end cap at the end of the outermost battery cell, the tab of the outermost battery cell can be electrically connected to the end cap to form a complete passage.

[0058] In a possible implementation, the end cover includes a metal cover, an insulating member, and a metal ring; the insulating member is located between the metal cover and the metal ring and is connected to the metal cover and the metal ring;

[0059] The metal cover is connected to the tab of the battery cell, and the metal ring is connected to the outermost shell of the battery cell.

[0060] In some embodiments, by using the metal cover in the end cap to electrically connect with the tab of the battery cell, compared with the prior art of welding the pole and the tab, the space occupied by the metal cover in the battery cell shell can be reduced, while ensuring that the capacity of the battery cell remains unchanged, the overall volume of the battery cell can be further reduced, thereby reducing the volume of the battery.

[0061] A third aspect of the embodiments of the present application provides a battery comprising a plurality of battery cells, wherein the plurality of battery cells are arranged along a first direction;

[0062] Each of the battery cells comprises a shell, a tab and an end cap, wherein the end cap is connected to the shell and electrically connected to the tab in the shell;

[0063] In the first direction, the end covers of two adjacent battery cells are connected, so that the tabs of the two adjacent battery cells are electrically connected through the end covers.

[0064] In this way, by welding two end covers to electrically connect two adjacent battery cells, compared with the method of using two poles on the cover device for electrical connection in the prior art, the current carrying capacity at the end cover can be improved, the current loss at the end cover can be reduced, and the heat generation can be reduced, thereby increasing the power of the battery.

[0065] In a possible implementation, the end cover includes a metal cover, an insulating member, and a metal ring; the insulating member is located between the metal cover and the metal ring and is connected to the metal cover and the metal ring;

[0066] The metal cover is connected to the tab of the battery cell, and the metal ring is connected to the shell of the battery cell;

[0067] In the first direction, the metal covers in the end covers of two adjacent battery cells are connected by welding.

[0068] In this way, by welding the metal cover to the tab, compared with the method of electrically connecting the pole and the tab in the prior art, the space occupancy rate of the metal cover in the battery cell shell can be reduced, thereby increasing the capacity of the battery cell while ensuring that the volume of the battery cell shell remains unchanged, thereby improving the space utilization inside the battery cell shell.

[0069] A fourth aspect of the embodiments of the present application provides an electrical device, which includes an electrical device and a battery.

[0070] The battery is the battery described above, and the battery is used to provide electrical energy to the electrical device.

[0071] An embodiment of the present application provides an electric device. By using the above-mentioned battery, the electric device can reduce the loss and heat generation of the electric device, improve the battery life and working stability of the electric device, and improve the assembly efficiency of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0073] Figure 1 A schematic structural diagram of a cover device provided in an embodiment of the present application;

[0074] Figure 2 A schematic cross-sectional view of a cover device provided in an embodiment of the present application;

[0075] Figure 3 A schematic structural diagram of a battery cell module provided in an embodiment of the present application;

[0076] Figure 4 A schematic structural diagram of a battery cell module provided in an embodiment of the present application;

[0077] Figure 5 A schematic structural diagram of an end cap provided in an embodiment of the present application;

[0078] Figure 6 A schematic diagram of the connection structure of two end covers between two adjacent battery cells provided in an embodiment of the present application;

[0079] Figure 7 A schematic structural diagram of another battery cell module provided in an embodiment of the present application.

[0080] Description of reference numerals:

[0081] 1-battery; 10-cover assembly; 20-cell; 30-cell module; 40-end cap;

[0082] 41-metal cover; 42-insulating member; 43-metal ring;

[0083] 100-cover plate body;

[0084] 110 - first end; 120 - second end; 130 - third flange;

[0085] 200-first component;

[0086] 210 - first insulating member; 220 - first metal ring;

[0087] 211 - first flange; 212 - first connecting surface; 213 - first through hole;

[0088] 221 - first abutting surface; 222 - first welding side surface;

[0089] 300-second component;

[0090] 310 - second insulating member; 320 - second metal ring;

[0091] 311 - second flange; 312 - second connection surface; 313 - second through hole;

[0092] 321 - second abutting surface; 322 - second welding side surface. DETAILED DESCRIPTION

[0093] As described in the background art, the connection efficiency between battery cells in the related art is low, which reduces the assembly efficiency of the battery. The reason for this problem is that in the related art, when electrically connecting multiple battery cells, it is necessary to connect the poles at the ends of the two battery cells by welding to achieve electrical connection of the multiple battery cells. However, this method requires the pole-to-pole welding process to be performed once at the ends of each two adjacent battery cells, resulting in low connection efficiency between the battery cells and reduced battery assembly efficiency.

[0094] To address the above technical issues, embodiments of the present application provide a cover plate device, a battery, and an electrical device, comprising a cover plate body, a first component, and a second component. The cover plate body replaces the poles used in the prior art to electrically connect the tabs on two adjacent battery cells, and the cover plate body is connected to the two adjacent battery cells via the first component and the second component, thereby avoiding the welding assembly process of the cover plate assembly between the two adjacent battery cells, improving the assembly efficiency between the battery cells, and thus improving the assembly efficiency of the battery.

[0095] Furthermore, by using the cover body to electrically connect the tabs on two adjacent battery cells, the use of poles to connect the tabs can be avoided. Moreover, since the surface area of ​​the cover body is larger than the surface area of ​​the poles, the current carrying capacity of the cover body can be improved, the power loss at the cover body can be reduced, and thus the power consumption of the battery can be reduced.

[0096] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0097] refer to Figure 1 、 Figure 2 and Figure 3 An embodiment of the present application may include providing a cover device 10 , which may include a cover body 100 , a first component 200 , and a second component 300 .

[0098] The cover body 100 may include a Figure 2 The first end 110 and the second end 120 are opposite to each other (as shown by the arrow x in the figure), the first end 110 is used to be electrically connected to the tab of one of the two adjacent battery cells 20, and the second end 120 is used to be electrically connected to the tab of the other of the two adjacent battery cells 20.

[0099] The first end 110 and / or the second end 120 can be electrically connected to the tabs on two adjacent battery cells 20 by welding. Specifically, the welding process can be a laser penetration welding process.

[0100] In some embodiments, the cover body 100 can be manufactured by stamping, and the material of the cover body 100 can be aluminum, steel, copper-aluminum composite material, steel-aluminum composite material, steel-nickel-plated material, or copper-nickel-plated material. The cover body 100 does not react with the electrolyte.

[0101] By using the cover body 100 to electrically connect the tabs on two adjacent battery cells 20, it is possible to avoid using poles to connect the tabs. Moreover, since the surface area of ​​the cover body 100 is larger than the surface area of ​​the poles, the current carrying capacity of the cover body 100 can be improved, and the power loss at the cover body 100 can be reduced, thereby reducing the power consumption of the battery 1.

[0102] The first component 200 is disposed at and connected to the first end 110 of the cover body 100. The first component 200 is used to connect to the housing of one of the two adjacent battery cells 20. The first component 200 can be connected to the housing of one of the battery cells 20 by welding.

[0103] The second component 300 is disposed at the second end 120 of the cover body 100 and connected to the second end 120. The second component 300 is connected to the housing of the other of the two adjacent battery cells 20. The second component 300 can be connected to the housing of the other battery cell 20 by welding.

[0104] The embodiment of the present application provides a cover plate device 10, which may include a cover plate body 100, a first component 200, and a second component 300. The cover plate body 100 replaces the pole to electrically connect the tabs on two adjacent battery cells 20, and the cover plate body 100 is connected to the two adjacent battery cells 20 through the first component 200 and the second component 300, thereby avoiding the welding assembly process of the cover plate assembly between the two adjacent battery cells 20, improving the assembly efficiency between the battery cells 20, and further improving the assembly efficiency of the battery 1.

[0105] refer to Figure 2 In some embodiments, in the thickness direction of the cover body 100, the maximum distance between the first end 110 and the second end 120 of the cover body 100 (eg Figure 2 (shown as h0 in FIG) can be greater than or equal to 1 mm. For example, h0 can be one of 2 mm, 3 mm, and 5 mm.

[0106] In this way, by making the distance h0 from the first end 110 to the second end 120 on the cover body 100 greater than or equal to 1 mm, it is possible to avoid deformation or penetration of the cover body 100 when the tab is welded to the cover body 100, thereby improving the durability of the cover body 100 and the yield of the cover device 10, and improving the success rate of welding between the cover device 10 and the tab.

[0107] In a specific implementation, if the tabs on the two battery cells 20 connected to the cover body 100 are both copper tabs, h0 can be between 2.1 mm and 3.1 mm. If the tabs on the two battery cells 20 connected to the cover body 100 are both aluminum tabs, h0 can be between 4 mm and 6 mm. If one of the tabs on the two battery cells 20 connected to the cover body 100 is copper and the other is aluminum, h0 can be between 3.0 mm and 4.6 mm.

[0108] refer to Figure 2 In some embodiments, the first assembly 200 may include a first insulating member 210. The first insulating member 210 is used to insulate between the cap body 100 and the housing of one of the two adjacent battery cells 20.

[0109] In this way, the first component 200 can include a first insulating member 210 so that the cover body 100 is connected to the shell of the battery cell 20 through the first insulating member 210, thereby avoiding electrical connection between the cover body 100 and the shell of the battery cell 20 and causing a short circuit.

[0110] The first insulating member 210 can be disposed on the outer periphery of the cover body 100 so that the outer periphery of the cover body 100 is insulated from the housing of the battery cell 20 by the first insulating member 210. The first insulating member 210 and the cover body 100 can be connected by welding.

[0111] Likewise, the second assembly 300 may also include a second insulating member 310. The second insulating member 310 is used to insulate between the cover body 100 and the housing of the other of the two adjacent battery cells 20.

[0112] In this way, the second component 300 can include a second insulating member 310 to connect the cover body 100 to the shell of the battery cell 20 through the second insulating member 310, thereby avoiding electrical connection between the cover body 100 and the shell of the battery cell 20 and causing a short circuit.

[0113] The second insulating member 310 can be disposed on the outer periphery of the cover body 100 so that the outer periphery of the cover body 100 is insulated from the housing of the battery cell 20 by the second insulating member 310. The second insulating member 310 and the cover body 100 can be connected by welding.

[0114] The first insulating member 210 and the second insulating member 310 may be made of the same material. For example, the first insulating member 210 and the second insulating member 310 may be made of ceramic, polyphenylene sulfide (PPS) injection molding material, or glass.

[0115] refer to Figure 2 In some embodiments, the outer circumference of the first insulating member 210 has a first flange 211, and the first flange 211 has a first connection surface 212. The first connection surface 212 is located on the side of the first flange 211 facing away from the second component 300 in the thickness direction. The first connection surface 212 faces the housing of the battery cell 20 and can be used to abut and connect with the end of the housing of the battery cell 20.

[0116] In this way, by setting the first flange 211 on the outer peripheral side of the first insulating part 210, the first connecting surface 212 of the first flange 211 can be abutted against the end of the shell of the battery cell 20, so as to limit the height direction of the shell of the battery cell 20 by the first flange 211, thereby improving the connection stability between the first component 200 and the battery cell 20 and limiting the displacement of the shell of the battery cell 20 in the height direction.

[0117] refer to Figure 2 In some embodiments, the thickness of the first flange 211 (eg Figure 2 For example, the thickness L1 of the first flange 211 may be 0.5 mm, 0.6 mm, or 1.5 mm.

[0118] In this way, by making the thickness L1 of the first flange 211 greater than or equal to 0.4 mm, the thickness L1 of the first flange 211 can be avoided from being too thin. For example, when the thickness L1 of the first flange 211 is 0.1 mm, it is easy to cause damage to the first flange 211, and during the welding process, it is easy to cause the first flange 211 to crack.

[0119] Continue to refer Figure 2 In some embodiments, the outer circumference of the second insulating member 310 has a second flange 311, and the second flange 311 has a second connection surface 312. The second connection surface 312 is located on the side of the second flange 311 facing away from the first component 200 in the thickness direction. The second connection surface 312 faces the housing of the battery cell 20 and can be used to abut and connect with the end of the housing of the battery cell 20.

[0120] In this way, by setting the second flange 311 on the outer peripheral side of the second insulating part 310, the second connecting surface 312 of the second flange 311 can be abutted against the end of the shell of the battery cell 20, so as to limit the height direction of the shell of the battery cell 20 by the second flange 311, thereby improving the connection stability between the second component 300 and the battery cell 20 and limiting the displacement of the shell of the battery cell 20 in the height direction.

[0121] refer to Figure 2 In some embodiments, the thickness of the second flange 311 is greater than or equal to 0.4 mm (e.g. Figure 2 For example, the thickness L2 of the second flange 311 may be 0.5 mm, 0.6 mm, or 1.5 mm. The thickness L1 of the first flange 211 and the thickness L2 of the second flange 311 may be the same.

[0122] In this way, by making the thickness of the second flange 311 greater than or equal to 0.4 mm, the thickness of the second flange 311 can be avoided from being too thin. For example, when the thickness of the second flange 311 is 0.1 mm, it is easy to cause damage to the second flange 311, and during the welding process, it is easy to cause the second flange 311 to crack.

[0123] refer to Figure 2In some embodiments, the first insulating member 210 has a first through hole 213, and the second insulating member 310 has a second through hole 313. The first through hole 213 and the second through hole 313 can be arranged opposite each other, and the first through hole 213 and the second through hole 313 can be arranged coaxially, thereby facilitating the manufacture of the first insulating member 210 and the second insulating member 310 and facilitating the assembly of the cover body 100 with the first insulating member 210 and the second insulating member 310.

[0124] The cover body 100 may include a third flange 130 . The third flange 130 is pressed between two opposite end surfaces of the first insulating member 210 and the second insulating member 310 and covers the first through hole 213 and the second through hole 313 .

[0125] The area on the cover body 100 corresponding to the first through hole 213 and / or the second through hole 313 is used to electrically connect to the tabs of the battery cell 20 .

[0126] In some embodiments, the cover body 100 may have two protrusions, which can be respectively disposed in the first through hole 213 and the second through hole 313. The protrusions can be used to electrically connect to the tabs on the battery cell 20. Furthermore, along the thickness direction of the cover body 100, the height of the protrusions is less than the height of the first through hole 213 or the second through hole 313, so as to prevent the protrusions from occupying space inside the housing of the battery cell 20.

[0127] In this way, by opening the first through hole 213 on the first insulating member 210 and pressing the third flange 130 on the cover body 100 against the two opposite end faces of the first insulating member 210 and the second insulating member 310, the first insulating member 210 and the second insulating member 310 can be limited in the height direction of the battery cell 20, and the displacement of the cover body 100 in its thickness direction can be limited, thereby improving the structural compactness of the cover device 10.

[0128] Furthermore, since the third flange 130 is provided on the outer peripheral side of the cover body 100, the cross-sectional inertia moment of the cover body 100 is increased, thereby improving its anti-bending ability, thereby increasing the overall rigidity of the cover body 100 and making it less likely to deform when subjected to external force.

[0129] The third flange 130 can also disperse and distribute the stress applied to the cover plate body 100 , reduce stress concentration points, and thus reduce the risk of local failure.

[0130] In addition, by extending the tabs into the first through-hole 213 and / or the second through-hole 313, and electrically connecting the areas on the cover body 100 corresponding to the first through-hole 213 and / or the second through-hole 313 to the tabs on two adjacent battery cells 20, compared to a method in which the poles extend into the interior of the battery cell 20 housing and then are electrically connected to the tabs, the cover body 100 can be prevented from occupying a large space inside the housing, reducing the space occupied by the cover assembly within the housing of the battery cell 20. This can increase the internal capacitance of the battery cell 20 while maintaining the same volume of the battery cell 20. Alternatively, while ensuring that the capacitance remains unchanged, the length of the battery cell 20 can be reduced, thereby facilitating a reduction in the volume of the battery 1.

[0131] Specifically, by using the cap body 100 instead of the pole, the height of the inner portion of the casing of the battery cell 20 can be saved by 5.4 mm to 22.8 mm in the height direction of the cap body 100 .

[0132] If the terminal is a ceramic terminal, the height savings ranges from 14.6 mm to 22.8 mm. If the height savings is less than 14.6 mm, the material cost of the cover body 100 is high, and the space utilization within the housing of the battery cell 20 is low. If the height savings is greater than 22.8 mm, the structural strength and manufacturability of the cover body 100 are poor.

[0133] refer to Figure 2 In some embodiments, along the radial direction of the first through-hole 213, the distance from the outer edge of the third flange 130 to the outer edge of the first flange 211 is h1. The distance from the first connection surface 212 of the first flange 211 to the end surface of the first insulating member 210 facing the cover body 100 is h2, and h1 + h2 ≥ 1.6 mm. It is understood that the sum of h1 and h2 can be the creepage distance from the housing of the battery cell 20 to the outer edge of the cover body 100. This creepage distance can be 2 mm, 3 mm, or 4 mm.

[0134] In this way, a sufficiently long creepage distance can be ensured between the cover body 100 and the shell of one of the two adjacent battery cells 20 , thereby avoiding high-voltage breakdown between the battery cell 20 and the cover body 100 and improving the safety of the battery 1 .

[0135] refer to Figure 2In some embodiments, along the radial direction of the second through-hole 313, the distance from the outer edge of the third flange 130 to the outer edge of the second flange 311 is h3, and the distance from the second connection surface 312 of the second flange 311 to the end surface of the second insulating member 310 facing the cover body 100 is h4, where h3 + h4 ≥ 1.6 mm. It is understood that the sum of h3 and h4 can be the creepage distance from the housing of the battery cell 20 to the outer edge of the cover body 100. This creepage distance can be 2 mm, 3 mm, or 4 mm.

[0136] Similarly, this can ensure that there is a sufficiently long creepage distance between the cover body 100 and the shell of the other of the two adjacent battery cells 20, thereby avoiding high-voltage breakdown between the battery cell 20 and the cover body 100 and improving the safety of the battery 1.

[0137] refer to Figure 2 In some embodiments, the first component 200 may further include a first metal ring 220, which is disposed on the outer periphery of the first insulating member 210 and connected to the first connecting surface 212. The first metal ring 220 may be connected to the first connecting surface 212 by welding.

[0138] The first metal ring 220 is used to connect to the housing of one of the two adjacent battery cells 20. In some embodiments, the inner sidewall of the first metal ring 220 can also be connected to the outer sidewall of the first insulating member 210 to improve the connection stability between the first insulating member 210 and the first metal ring 220.

[0139] In this way, by using the first metal ring 220 to weld the first insulating member 210 and the shell of one of the two adjacent battery cells 20, the problem of shell welding damage caused by the melting point of the first insulating member 210 being higher than the shell when the first insulating member 210 is directly welded to the shell of the battery cell 20 can be avoided, thereby improving the weldability between the cover device 10 and the shell of the battery cell 20.

[0140] In other embodiments, the second component 300 may further include a second metal ring 320, which is disposed on the outer periphery of the second insulating member 310 and connected to the second connection surface 312. The second metal ring 320 may be connected to the second connection surface 312 by welding.

[0141] The second metal ring 320 is used to connect to the housing of the other of the two adjacent battery cells 20. In some embodiments, the inner sidewall of the second metal ring 320 can also be connected to the outer sidewall of the second insulating member 310 to improve the connection stability between the second insulating member 310 and the second metal ring 320.

[0142] In this way, by using the second metal ring 320 to weld the second insulating member 310 and the shell of the other of the two adjacent battery cells 20, the problem of shell welding damage caused by the melting point of the second insulating member 310 being higher than the shell when the second insulating member 310 is directly welded to the shell of the battery cell 20 can be avoided, thereby improving the weldability between the cover device 10 and the shell of the battery cell 20.

[0143] In some embodiments, the end of the first metal ring 220 facing the housing of the battery cell 20 may have a first abutting surface 221 and a first welding side surface 222. The first abutting surface 221 abuts against the end edge of the housing of the battery cell 20. The abutting portion can limit the displacement of the first metal ring 220 in the height direction of the battery cell 20 and enable the housing to provide height support for the first metal ring 220 and the first insulating member 210. The first welding side surface 222 faces the inner side wall of the housing and connects the housing and the first welding side surface 222 by laser penetration welding.

[0144] Similarly, in some embodiments, the end of the second metal ring 320 facing the housing of the battery cell 20 may have a second abutting surface 321 and a second welding side surface 322. The second abutting surface 321 abuts the end edge of the housing of the battery cell 20. The abutting portion can limit the displacement of the second metal ring 320 in the height direction of the battery cell 20 and enable the housing to provide height support for the second metal ring 320 and the second insulating member 310. The second welding side surface 322 faces the inner side wall of the housing and connects the housing and the second welding side surface 322 by laser penetration welding.

[0145] refer to Figure 4 The embodiment of the present application further provides a battery 1, which may include a plurality of battery cells 20, wherein the plurality of battery cells 20 are arranged along a first direction (eg Figure 4 As shown by the arrow x in the figure, each battery cell 20 may include a shell and a tab located in the shell, and the cover device 10 as described above, and the cover device 10 is located between two adjacent battery cells 20.

[0146] The first end 110 of the cover body 100 in the cover device 10 is electrically connected to the tab of one of the two adjacent battery cells 20, and the second end 120 of the cover body 100 in the cover device 10 is electrically connected to the tab of the other of the two adjacent battery cells 20. The first component 200 of the cover device 10 is connected to the housing of one of the two adjacent battery cells 20, and the second component 300 of the cover device 10 is connected to the housing of the other of the two adjacent battery cells 20.

[0147] In this way, by connecting the ends of two connected battery cells 20 using the cover plate device 10, a plurality of battery cells 20 can be assembled, thereby improving the assembly efficiency of the battery 1 and reducing the power consumption and heat generation of the battery 1.

[0148] In a specific embodiment, if the dimensions of the battery 1 are 1380mm×648mm×13.5mm, and multiple cells 20 are connected in series and in parallel using poles, the battery pack may require 144 cells 20 connected in series and in parallel. If the cover device 10 of the present application is used to connect multiple cells 20 in series and form a battery pack, only 48 cell modules 30 are required, with three batteries 1 connected in series and in parallel within each cell module 30. Space utilization can be improved by 2.96%-4.62%. If the capacity of a single cell 20 is 54×3=162ah, the total capacity can be increased by 29.4%-40.1%.

[0149] In some embodiments, the battery 1 can be a cylindrical battery, a square shell battery, or a "blade battery".

[0150] In some embodiments, multiple battery cells 20 can be electrically connected to form a battery cell module 30 through the cover device 10. The battery 1 can have multiple battery cell modules 30, and the multiple battery cell modules 30 can be arranged along the second direction (such as Figure 4 Arranged as shown by arrow Y in the figure.

[0151] refer to Figure 4 and Figure 5 In some embodiments, the battery 1 may further include an end cap 40. In the first direction, the end of the outermost battery cell 20 is provided with the end cap 40. Thus, by providing the end cap 40 at the end of the outermost battery cell 20, the tab of the outermost battery cell 20 can be electrically connected to the end cap 40, forming a complete pathway.

[0152] refer to Figure 5 In some embodiments, the end cap 40 may include a metal cap 41, an insulating member 42, and a metal ring 43. The insulating member 42 is located between the metal cap 41 and the metal ring 43 and is connected to the metal cap 41 and the metal ring 43. The metal cap 41 is connected to the tab of the battery cell 20, and the metal ring 43 is connected to the shell of the outermost battery cell 20.

[0153] In some embodiments, by using the metal cover 41 in the end cover 40 to electrically connect with the tab of the battery cell 20, compared with using the pole and the tab for welding, the space occupied by the metal cover 41 in the shell of the battery cell 20 can be reduced. While ensuring that the capacity of the battery cell 20 remains unchanged, the overall volume of the battery cell 20 is further reduced, thereby reducing the volume of the battery 1.

[0154] Continue to refer Figure 5 、 Figure 6and Figure 7 The present application also provides a battery 1, which may include a plurality of battery cells 20 arranged along a first direction. Each battery cell 20 may include a housing, a tab, and an end cap 40. The end cap 40 is connected to the housing and electrically connected to the tab within the housing. In the first direction, the end caps 40 of two adjacent battery cells 20 are connected, so that the tabs of the two adjacent battery cells 20 are electrically connected through the end caps 40.

[0155] In this way, by welding the two end covers 40 to electrically connect the two adjacent battery cells 20, compared with the method of using the poles on the two cover devices 10 for electrical connection in the prior art, the current carrying capacity at the end cover 40 can be improved, the current loss at the end cover 40 can be reduced, and the heat generation can be reduced, thereby increasing the power of the battery 1.

[0156] refer to Figure 5 In some embodiments, the end cap 40 may include a metal cap 41, an insulating member 42, and a metal ring 43. The insulating member 42 is located between the metal cap 41 and the metal ring 43 and is connected to the metal cap 41 and the metal ring 43. The metal cap 41 is connected to the tab of the battery cell 20, and the metal ring 43 is connected to the housing of the battery cell 20. In the first direction, the metal caps 41 in the end caps 40 of two adjacent battery cells 20 are welded together.

[0157] In this way, by welding the metal cover 41 to the tab, compared with the method of electrically connecting the pole and the tab in the prior art, the space occupancy rate of the metal cover 41 in the shell of the battery cell 20 can be reduced, thereby increasing the capacity of the battery cell 20 while ensuring that the volume of the shell of the battery cell 20 remains unchanged, thereby improving the space utilization inside the shell of the battery cell 20.

[0158] The embodiment of the present application further provides an electric device, which may include an electric device and a battery 1. The battery 1 is the battery 1 described above, and the battery 1 is used to provide power to the electric device.

[0159] The embodiment of the present application provides an electric device. By using the above-mentioned battery 1, the electric device can reduce the loss and heat generation of the electric device, improve the battery life and working stability of the electric device, and improve the assembly efficiency of the electric device.

[0160] In some embodiments, the electrical equipment can be a vehicle or an energy storage device. The vehicle can be an electric vehicle / equipment (Electric Vehicle, referred to as EV), a pure electric vehicle equipment (Pure Electric Vehicle / Battery Electric Vehicle, referred to as PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle, referred to as HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle (New Energy Vehicle).

[0161] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0162] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0163] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0164] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0165] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover device, characterized in that: include: The cover body includes a first end and a second end, wherein the first end is used to electrically connect to the tab of one of the two adjacent battery cells, and the second end is used to electrically connect to the tab of the other of the two adjacent battery cells; a first component, the first component being disposed at the first end of the cover body and connected to the first end, the first component being used to be connected to a housing of one of the two adjacent battery cells; The second component is arranged at the second end of the cover body and connected to the second end, and the second component is connected to the shell of the other battery cell of the two adjacent battery cells.

2. The cover device according to claim 1, characterized in that: In the thickness direction of the cover plate body, a maximum distance between the first end and the second end of the cover plate body is greater than or equal to 1 mm.

3. The cover device according to claim 1, characterized in that: The first assembly includes a first insulating member; The first insulating member is used to insulate between the cover body and the shell of one of the two adjacent battery cells; and / or, the second component includes a second insulating member; The second insulating member is used to insulate the cover plate body from the shell of the other battery cell among the two adjacent battery cells.

4. The cover device according to claim 3, characterized in that: The outer peripheral side of the first insulating member has a first flange; The thickness of the first flange is greater than or equal to 0.4 mm.

5. The cover device according to claim 4, characterized in that: The outer peripheral side of the second insulating member has a second flange; The thickness of the second flange is greater than or equal to 0.4 mm.

6. The cover device according to claim 5, characterized in that: The first insulating member has a first through hole, and the second insulating member has a second through hole; The cover body includes a third flange, the third flange is pressed between two opposite end surfaces of the first insulating member and the second insulating member, and covers the first through hole and the second through hole; The area on the cover body corresponding to the first through hole and / or the second through hole is used to be electrically connected to the tab of the battery cell.

7. The cover device according to claim 6, characterized in that: Along the radial direction of the first through hole, the distance between the outer edge of the third flange and the outer edge of the first flange is h1; The surface of the first flange facing away from the second flange is a first connecting surface; A distance from the first connecting surface of the first flange to an end surface of the first insulating member facing the cover body is h2, and h1+h2≥1.6 mm.

8. The cover device according to claim 7, characterized in that: Along the radial direction of the second through hole, the distance from the outer edge of the third flange to the outer edge of the second flange is h3; The surface of the second flange facing away from the first flange is a second connecting surface; A distance from the second connecting surface of the second flange to the end surface of the second insulating member facing the cover body is h4, and h3+h4≥1.6 mm.

9. The cover device according to claim 5, characterized in that: The first component further includes a first metal ring, which is disposed on the outer periphery of the first insulating member and connected to the first flange; The first metal ring is used to be connected to the shell of one of the two adjacent battery cells; And / or, the second component further includes a second metal ring, which is arranged on the outer periphery of the second insulating member and connected to the second flange; The second metal ring is used to be connected to the shell of the other battery cell among the two adjacent battery cells.

10. A battery, characterized in that: include A plurality of battery cells are arranged along a first direction, and each of the battery cells includes a shell and a tab located in the shell; and the cover plate device according to any one of claims 1 to 9, wherein the cover plate device is located between two adjacent battery cells; The first end of the cover plate body in the cover plate device is electrically connected to the tab of one of the two adjacent battery cells, and the second end of the cover plate body in the cover plate device is electrically connected to the tab of the other of the two adjacent battery cells; The first component of the cover device is connected to the shell of one of the two adjacent battery cells, and the second component of the cover device is connected to the shell of the other of the two adjacent battery cells.

11. The battery according to claim 10, characterized in that Also includes: An end cap is provided at the end of the battery cell located at the outermost side in the first direction.

12. The battery according to claim 11, characterized in that The end cover includes a metal cover, an insulating member and a metal ring; the insulating member is located between the metal cover and the metal ring and is connected to the metal cover and the metal ring; The metal cover is connected to the tab of the battery cell, and the metal ring is connected to the outermost shell of the battery cell.

13. A battery, characterized in that: comprising a plurality of battery cells, wherein the plurality of battery cells are arranged along a first direction; Each of the battery cells comprises a shell, a tab and an end cap, wherein the end cap is connected to the shell and electrically connected to the tab in the shell; In the first direction, the end covers of two adjacent battery cells are connected, so that the tabs of the two adjacent battery cells are electrically connected through the end covers.

14. The battery according to claim 13, characterized in that The end cover includes a metal cover, an insulating member and a metal ring; the insulating member is located between the metal cover and the metal ring and is connected to the metal cover and the metal ring; The metal cover is connected to the tab of the battery cell, and the metal ring is connected to the shell of the battery cell; In the first direction, the metal covers in the end covers of two adjacent battery cells are connected by welding.

15. An electrical device, characterized in that: Including electrical devices and batteries, The battery is the battery according to any one of claims 10 to 14, and the battery is used to provide electrical energy to the electrical device.

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