Battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery, which comprises a pole group, a cover plate assembly and a shell, the end part of the pole group is connected with a tab and a protection part, the end part of the pole group is provided with an assembling groove, the assembling groove and the protection part are arranged along a first direction, and at least part of the tab is arranged in the assembling groove; the cover plate assembly comprises a cover plate body and a pole, a clamping part is arranged at the position, corresponding to the protection part, of the cover plate body, so that the cover plate body is clamped with the pole group, the pole is arranged on the cover plate body and connected with the tab, and the surface, deviating from the pole group, of the clamping part protrudes out of the pole in the second direction; the shell and the cover plate body are enclosed to form a space for accommodating a pole group; the first direction is the length direction of the cover plate body, and the second direction is the height direction of the cover plate body. Therefore, the protection part can protect the pole, the protection effect on the pole is improved, the overall electric quantity of the battery is increased, the end space of the pole group is fully utilized, the space utilization rate is improved, and the structure of the battery is more compact.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery. Background Technology

[0002] With the rapid development of industries such as portable electronic devices, power tools, and new energy vehicles, higher requirements have been placed on the energy density, rate performance, and safety performance of battery products.

[0003] In related technologies, a battery includes an electrode assembly, a cover plate, and a housing. The cover plate and the housing enclose a space for accommodating the electrode assembly. The cover plate is usually provided with a rivet block and a terminal post. The electrode assembly is provided with a tab at its end. The electrode assembly and the terminal post are electrically connected through the tab.

[0004] However, the cover plate is usually a flat structure, and the rivet blocks and terminals protrude from the cover plate. This makes the rivet blocks and terminals prone to bumps and damage during transportation, assembly and other processes, which affects the battery yield and safety. The space utilization rate on the cover plate, the space utilization rate between the cover plate and the terminal group, and the space utilization rate inside the casing are all low, which is not conducive to improving the battery capacity. In addition, the cover plate has poor structural strength and poor connection stability between the terminal group end and the cover plate. This can easily lead to damage or movement of the electrode sheets during the process of pushing the terminal group into the casing, affecting the battery capacity and assembly ratio. Summary of the Invention

[0005] The purpose of this invention is to provide a battery that solves the problems of low battery space utilization, limited capacity increase, and poor protection of the terminals.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A battery includes: an electrode assembly, wherein an electrode tab and a protective portion are connected to an end of the electrode assembly, and an assembly groove is formed at the end of the electrode assembly, the assembly groove and the protective portion are arranged along a first direction, and the electrode tab is at least partially disposed within the assembly groove; a cover plate assembly, wherein the cover plate assembly includes a cover plate body and a terminal post, the cover plate body is provided with a snap-fit ​​portion corresponding to the position of the protective portion to snap-fit ​​the cover plate body with the electrode assembly, the terminal post is disposed on the cover plate body and connected to the electrode tab, and the snap-fit ​​portion protrudes from the surface of the electrode assembly and is disposed from the terminal post along a second direction; and a housing, wherein the housing and the cover plate body enclose a space for accommodating the electrode assembly; the first direction is the length direction of the cover plate body, and the second direction is the height direction of the cover plate body.

[0008] Preferably, the electrode assembly is connected with a first protrusion and a second protrusion, both of which are disposed on the side of the electrode assembly. One end of the second protrusion is connected to the first protrusion, and the other end is connected to the protective part.

[0009] Preferably, the housing includes a first half-shell and a second half-shell, which are centrally symmetrically arranged on the electrode group. The first half-shell, the second half-shell, and the cover plate body enclose a space for accommodating the electrode group.

[0010] Preferably, the end of the electrode assembly has two mounting slots, which are symmetrically arranged on both sides of the protective part in the first direction. Each mounting slot has an electrode post on both sides in the third direction, which is the width direction of the cover plate body.

[0011] Preferably, the two walls of the assembly groove in the third direction are inclined, the length of the assembly groove on the side facing the end face of the electrode group is less than the length on the side away from the end face of the electrode group, the included angle between the two walls of the assembly groove in the third direction is N, and satisfies 16°≤N≤60°; and / or, along the third direction, the length of the protective part is B1, the width of the cover plate body at the position of the assembly groove is B2, and satisfies 16mm≤B1-B2≤70mm.

[0012] Preferably, the cover plate assembly further includes a first welding plate, which is disposed on the side of the cover plate body away from the electrode group and is snapped into the cover plate body. The electrode post is connected to the first welding plate, and along the second direction, the surface of the snapping portion away from the electrode group protrudes from the surface of the first welding plate away from the cover plate body.

[0013] Preferably, along the second direction, the thickness of the snap-fit ​​portion is T1, and satisfies 1mm≤T1≤2mm; and / or, the thickness of the first welding plate is T2, and satisfies 2mm≤T2≤3.5mm.

[0014] Preferably, along the second direction, the distance between the surface of the snap-fit ​​portion facing away from the pole group and the surface of the first welding plate facing away from the cover plate body is H1, and satisfies 5mm≤H1≤12mm; and / or, the height of the snap-fit ​​portion is H2, and satisfies 28mm≤H2≤50mm.

[0015] Preferably, the cover plate assembly further includes a first plastic material disposed between the first welding plate and the cover plate body. The protective portion has a first welding plate and a first plastic material on each side in the first direction. Along the first direction, the length of the cover plate body is A, and the distance between the mutually distancing surfaces of the first plastic materials on both sides of the snap-fit ​​portion is L2, satisfying 6mm≤A-L2≤16mm; and / or, the width of the snap-fit ​​portion is L1, satisfying 0.25≤L1 / A≤0.5.

[0016] Preferably, along a third direction, the width of the snap-fit ​​portion away from the end of the housing is W1, and the width of the snap-fit ​​portion towards the end of the housing is B1, satisfying 0.6≤W1 / B1≤0.9, where the third direction is the width direction of the cover plate body; and / or, the length of the mounting groove away from the cover plate body is W2, and the width of the cover plate body corresponding to the position of the mounting groove is B2, satisfying 0.3≤W2 / B2≤0.55.

[0017] The beneficial effects of this invention are:

[0018] A battery includes an electrode assembly, a cover plate assembly, and a housing. The electrode assembly has tabs and a protective portion connected to its ends. The electrode assembly has an assembly groove at its ends, and the assembly groove and the protective portion are arranged along a first direction. The tabs are at least partially disposed within the assembly groove. The cover plate assembly includes a cover plate body and a terminal post. The cover plate body has a snap-fit ​​portion corresponding to the position of the protective portion to snap-fit ​​the cover plate body with the electrode assembly. The terminal post is disposed on the cover plate body and connected to the tabs. Along a second direction, the snap-fit ​​portion protrudes from the surface of the electrode assembly and is disposed on the terminal post. The housing and the cover plate body enclose a space for accommodating the electrode assembly. The first direction is the length direction of the cover plate body, and the second direction is the height direction of the cover plate body.

[0019] Thus, setting a protective part at the end of the electrode assembly can increase the battery's charge capacity and improve the protection of the terminals, preventing them from being bumped or damaged during transportation and assembly. By engaging the locking part with the protective part, the connection stability between the electrode assembly and the cover plate assembly can be improved, reducing damage and movement of the electrode assembly during casing and increasing battery yield. Setting terminals on both sides of the protective part can make full use of the space at the end of the electrode assembly, improve the space utilization of the cover plate assembly, make the battery structure more compact and improve the structural strength of the battery, which is conducive to increasing the battery's charge capacity and assembly ratio, and facilitates stable electrical connection between the battery and external circuits or other batteries. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first structure of a battery in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the second structure of the battery in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the pole group structure in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the shell structure in one embodiment of the present invention;

[0024] Figure 5 This is a top view of a cover plate assembly according to an embodiment of the present invention;

[0025] Figure 6 This is one embodiment of the present invention. Figure 5 AA section view;

[0026] Figure 7 This is one embodiment of the present invention. Figure 5 BB section view;

[0027] Figure 8 This is a schematic diagram of the first structure of the cover plate assembly in one embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the second structure of the cover plate assembly in one embodiment of the present invention;

[0029] Figure 10 This is a first exploded view of the cover plate assembly in one embodiment of the present invention;

[0030] Figure 11 This is a second exploded view of the cover plate assembly in one embodiment of the present invention;

[0031] Figure 12 This is a front view of a cover plate assembly according to an embodiment of the present invention.

[0032] In the picture:

[0033] 1. Pole assembly; 11. Pole lug; 12. Protective part; 13. Assembly slot; 14. First protrusion; 15. Second protrusion; 2. Cover plate assembly; 21. Cover plate body; 211. Snap-fit ​​part; 22. Pole post; 23. First welding plate; 24. Second welding plate; 25. First plastic; 26. Second plastic; 3. Housing; 31. First half-shell; 32. Second half-shell; 33. Explosion-proof valve; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0038] See Figures 1 to 3 This invention provides a battery comprising an electrode assembly 1, a cover plate assembly 2, and a housing 3. The electrode assembly 1 has a tab 11 and a protective part 12 connected to its end. The end of the electrode assembly 1 has an assembly groove 13, which is arranged along a first direction X. The tab 11 is at least partially disposed in the assembly groove 13. The cover plate assembly 2 includes a cover plate body 21 and a terminal post 22. The cover plate body 21 has a snap-fit ​​part 211 at the position corresponding to the protective part 12, so that the cover plate body 21 snaps into the electrode assembly 1. The terminal post 22 is disposed on the cover plate body 21 and connected to the tab 11. Along a second direction Y, the snap-fit ​​part 211 protrudes from the surface of the electrode assembly 1 and is disposed on the terminal post 22. The housing 3 and the cover plate body 21 enclose a space for accommodating the electrode assembly 1. The first direction X is the length direction of the cover plate body 21, and the second direction Y is the height direction of the cover plate body 21.

[0039] In this embodiment, the protective part 12 and the electrode assembly 1 are integrally formed. Both the protective part 12 and the snap-fit ​​part 211 extend along the third direction Z. The electrode tab 11 is located at the position where the assembly groove 13 is opened on the electrode assembly 1. The electrode tab 11 extends along the third direction Z, which is the width direction of the cover body 21. One of the groove walls of the assembly groove 13 in the first direction X is flush with the side of the protective part 12, and the other groove wall is flush with the side of the electrode assembly 1 in the first direction X. The electrode post 22 is located on the side of the assembly groove 13 in the third direction Z and is electrically connected to the electrode tab 11 so that the battery can be connected to an external circuit or other batteries. The shape of the cover body 21 is adapted to the end of the electrode assembly 1 so that the cover body 21 and the end of the electrode assembly 1 are fitted together.

[0040] Thus, by placing the terminal post 22 on the side of the protective part 12 and making the protective part 12 protrude from the terminal post 22, the protection effect of the terminal post 22 can be improved, avoiding bumps and damage to the terminal post 22 during transportation, assembly and other processes. The snap-fit ​​part 211 snaps into the protective part 12, which can improve the connection stability between the electrode group 1 and the cover plate assembly 2, reduce the damage and movement of the electrode sheets during the insertion of the electrode group 1 into the shell, and the protective part 12 can increase the volume of the electrode group 1, thereby increasing the overall capacity of the battery. The terminal post 22 and the snap-fit ​​part 211 are spaced apart, which can improve the space utilization of the cover plate assembly 2, making the overall structure of the battery more compact, which is conducive to increasing the capacity.

[0041] It is understandable that the pole post 22 can also be set on the groove wall of the assembly groove 13 in the third direction Z, so that the protective part 12 and the corresponding snap-fit ​​part 211 protrude from the pole post 22. The setting position of the pole post 22 can be adjusted according to actual needs, which will not be elaborated here.

[0042] See Figure 3 In some embodiments, the electrode assembly 1 is connected to a first protrusion 14 and a second protrusion 15. The first protrusion 14 and the second protrusion 15 are both disposed on the side of the electrode assembly 1. One end of the second protrusion 15 is connected to the first protrusion 14, and the other end is connected to the protective part 12.

[0043] In this embodiment, the first protrusion 14 and the second protrusion 15 are symmetrically disposed on two sides of the electrode assembly 1 in the third direction Z. The first protrusion 14 and the second protrusion 15 extend along the second direction Y. The side of the first protrusion 14 in the first direction X is flush with the side of the electrode assembly 1 in the first direction X. The two ends of the first protrusion 14 in the second direction Y are separated from the end of the electrode assembly 1. That is, the length of the first protrusion 14 in the second direction Y is less than the length of the electrode assembly 1 in the second direction Y. Two second protrusions 15 are disposed on the side of the electrode assembly 1 in the third direction Z. The two second protrusions 15 are symmetrically disposed on both sides of the first protrusion 14 in the second direction Y. The first protrusion 14, the second protrusion 15, the electrode assembly 1, and the protective part 12 are all integrally formed. The width of the first protrusion 14 is equal to the width of the protective part 12.

[0044] Thus, the first protrusion 14, the second protrusion 15, and the protective part 12 can all improve the overall capacity of the battery, as well as the connection stability between the electrode assembly 1 and the housing 3 and the connection stability between the electrode assembly 1 and the cover plate assembly 2, thereby improving the battery yield and safety. The first protrusion 14 and the second protrusion 15 are engaged with the housing 3, which can facilitate the positioning of the electrode assembly 1 in the assembly position, improve assembly efficiency, prevent the electrode sheets from being damaged or shifting during the insertion of the electrode assembly 1 into the housing, improve battery capacity, and make full use of the side space of the electrode assembly 1, which facilitates the interconnection of multiple batteries and the stable connection of the battery to the external circuit, thereby improving the assembly ratio.

[0045] It is understandable that the shape and position of the first protrusion 14 and the second protrusion 15 can be adjusted according to actual needs, which will not be elaborated here.

[0046] See Figure 3 and Figure 4 In some embodiments, the housing 3 includes a first half-shell 31 and a second half-shell 32, which are centrally symmetrically arranged on the electrode group 1. The first half-shell 31, the second half-shell 32, and the cover plate body 21 enclose a space for accommodating the electrode group 1.

[0047] In this embodiment, both the first half-shell 31 and the second half-shell 32 are "L"-shaped plate structures. That is, the first half-shell 31 covers two adjacent sides of the electrode assembly 1, and the second half-shell 32 covers the other two adjacent sides of the electrode assembly 1. The shapes of the first half-shell 31 and the second half-shell 32 are adapted to the shapes of the corresponding positions of the first protrusion 14 and the second protrusion 15, so that the housing 3 can be fitted to the electrode assembly 1. The connection between the first half-shell 31 and the second half-shell 32 is fixed and sealed by welding. The end faces of the first half-shell 31 and the second half-shell 32 on the same side are fixed and sealed to the cover plate body 21 by welding. The cover plate body 21 is a shell structure whose shape is adapted to the shape of the end of the electrode assembly 1 to cover the end of the electrode assembly 1. The housing 3 is connected to an explosion-proof valve 33. There are two explosion-proof valves 33, which are respectively located on the side wall of the first half-shell 31 and the side wall of the second half-shell 32.

[0048] Thus, since the first protrusion 14 and the second protrusion 15 are provided on the side of the electrode assembly 1, the shell 3 is formed by splicing the first half shell 31 and the second half shell 32. This can reduce the assembly interference between the shell 3 and the electrode assembly 1 during the assembly process, improve the assembly effect, and the first half shell 31 and the second half shell 32 have sufficient structural strength to achieve a stable connection with the shell 3 and the cover plate assembly 2, thereby improving the structural strength of the battery, facilitating the series or parallel connection of multiple batteries, and improving the battery capacity and assembly ratio.

[0049] See Figure 2 and Figure 3In some embodiments, the end of the electrode assembly 1 has two mounting slots 13, which are symmetrically arranged on both sides of the protective part 12 in the first direction X. On each side of the mounting slot 13 in the third direction Z, there is a pole post 22. That is, the end of the electrode assembly 1 is provided with four pole posts 22.

[0050] In this embodiment, the electrode post 22 is disposed on the end face of the electrode group 1, and the shape of the cover plate body 21 corresponding to the position of the mounting groove 13 is adapted to the mounting groove 13 so that the cover plate body 21 is fitted to the electrode group 1. The electrode post 22 passes through the cover plate body 21 and is electrically connected to the electrode tab 11 so that the battery is electrically connected to the external circuit.

[0051] Thus, by placing the terminal post 22 at the end of the electrode assembly 1, it can not only be protected by the protruding protective part 12, preventing the terminal post 22 from being bumped and damaged during transportation, assembly and other processes, but also make full use of the space on both sides of the snap-fit ​​part 211, improve the space utilization rate of the cover plate body 21, make the structure of the cover plate assembly 2 more compact, and enable the cover plate body 21 to have sufficient assembly space on the side away from the housing 3 to assemble the terminal post 22 and connect multiple batteries to each other, thereby improving the battery capacity and assembly ratio.

[0052] It is understandable that the number and location of the assembly slots 13 can be adjusted according to actual needs, as long as the cover plate body 21 and the pole group 1 can be stably connected. This will not be elaborated here.

[0053] See Figures 5 to 7 In some embodiments, the two groove walls of the assembly groove 13 in the third direction Z are inclined. The length of the assembly groove 13 on the side facing the end face of the electrode group 1 is less than the length on the side facing away from the end face of the electrode group 1. The included angle between the two groove walls of the assembly groove 13 in the third direction Z is N, and satisfies 16°≤N≤60°. Along the third direction Z, the width of the cover plate body 21 at the position of the assembly groove 13 is B2, and satisfies 16mm≤B1-B2≤70mm.

[0054] In this embodiment, the assembly groove 13 is a trapezoidal groove structure. The included angle N between the two groove walls of the assembly groove 13 in the third direction Z can be any value between 16° and 60° or any range between any two values, such as 16°, 20°, 30°, 40°, 50°, 60°, etc. The difference between the width B1 of the snap-fit ​​part 211 facing the end of the housing 3 and the width B2 of the cover plate body 21 where the assembly groove 13 is located can be any value between 16mm and 70mm or any range between any two values, such as 16mm, 20mm, 40mm, 60mm, 70mm, etc.

[0055] Thus, when assembling the cover plate assembly 2, the assembly groove 13 can guide the cover plate body 21 to fit snugly with the end of the electrode group 1, improving assembly efficiency and facilitating the interconnection of multiple batteries, thereby increasing the battery assembly ratio; the snap-fit ​​part 211 is positioned in the third direction Z, protruding from the cover plate body 21 at the position corresponding to the assembly groove 13, which can improve the structural strength of the cover plate body 21, thereby improving the connection stability between the cover plate assembly 2 and the electrode group 1, and preventing the electrode sheets from being damaged or shifting during the insertion of the electrode group 1 into the casing.

[0056] Understandably, the included angle N between the two walls of the assembly groove 13 in the third direction Z cannot be too small. If it is too small, it will reduce the efficiency of assembling the cover body 21 to the end of the electrode group 1. The included angle N between the two walls of the assembly groove 13 in the third direction Z cannot be too large either. If it is too large, it will affect the snap-fit ​​effect between the cover body 21 and the end of the electrode group 1, and reduce the stability of the cover assembly 2. The difference between the width B1 of the snap-fit ​​part 211 facing the end of the housing 3 and the width B2 of the cover body 21 where the assembly groove 13 is located cannot be too small. If it is too small, it will reduce the volume of the end of the electrode group 1 and affect the increase in battery capacity. The difference between the width B1 of the snap-fit ​​part 211 facing the end of the housing 3 and the width B2 of the cover body 21 where the assembly groove 13 is located cannot be too large either. If it is too large, it will occupy more external space, making the battery volume too large and reducing the assembly ratio.

[0057] See Figures 8 to 11 In some embodiments, the cover plate assembly 2 further includes a first welding plate 23, which is disposed on the cover plate body 21 away from the electrode group 1 (see reference). Figure 2 The electrode post 22 is connected to the first welding plate 23 and is attached to one side of the electrode group 1 and snapped into the cover plate body 21. The electrode post 22 is connected to the first welding plate 23. Along the second direction Y, the snap-fit ​​part 211 is positioned away from the surface of the electrode group 1 and protrudes from the surface of the first welding plate 23 away from the surface of the cover plate body 21.

[0058] In this embodiment, the cover plate assembly 2 further includes a second welding plate 24, a first plastic 25, and a second plastic 26. The second welding plate 24 is disposed on the side of the cover plate body 21 facing the electrode assembly 1. The shapes of the first welding plate 23 and the second welding plate 24 are adapted to the shape of the assembly groove 13. The first plastic 25 is disposed between the first welding plate 23 and the cover plate body 21, and the second plastic 26 is disposed between the second welding plate 24 and the cover plate body 21. The shape of the second plastic 26 is adapted to the shape of the cover plate body 21. Both the first plastic 25 and the second plastic 26 are made of insulating material so that the first welding plate 23 and the second welding plate 24 are insulated from the cover plate body 21. A sealing ring is fitted on the electrode post 22 to improve the sealing performance at the connection between the electrode post 22 and the cover plate body 21.

[0059] In this way, the space on both sides of the protective part 12 in the first direction X can be fully utilized and used to set the terminal post 22, the first welding plate 23, the second welding plate 24, the first plastic 25 and the second plastic 26, thereby improving the space utilization rate of the cover body 21. The snap-fit ​​part 211 can improve the protection effect on the terminal post 22 and the first welding plate 23, avoiding bumps and damage. The shape of the first welding plate 23 is adapted to the shape of the position of the mounting groove 13 on the cover body 21, which can facilitate the assembly of the terminal post 22 and enable the battery to be electrically connected to the external circuit or other batteries, thereby improving the stability of the battery.

[0060] See Figure 6 and Figure 7 In some embodiments, along the second direction Y, the thickness of the snap-fit ​​portion 211 is T1, and satisfies 1mm≤T1≤2mm, and the thickness of the first welding plate 23 is T2, and satisfies 2mm≤T2≤3.5mm.

[0061] In this embodiment, the thickness T1 of the snap-fit ​​portion 211 can be any value between 1mm and 2mm or any range between any two values, such as 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc.; the thickness T2 of the first welding plate 23 can be any value between 2mm and 3.5mm or any range between any two values, such as 2mm, 2.5mm, 3mm, 3.5mm, etc.

[0062] This allows the snap-fit ​​portion 211 to have sufficient thickness to provide support and protection for the protective portion 12, which is beneficial for improving the protection effect on the terminal post 22 and the first welding plate 23, and also improves the structural strength of the cover plate assembly 2, improves the connection stability between the cover plate assembly 2 and the electrode group 1, and makes the connection between the cover plate assembly 2, the electrode group 1 and the first half shell 31 and the second half shell 32 more stable, avoiding deformation caused by local stress concentration during assembly. The first welding plate 23 can be stably connected to the terminal post 22, and enable the battery to achieve electrical connection with external circuits or other batteries, thereby improving the battery's overcurrent capacity.

[0063] Understandably, the thickness T1 of the latching part 211 cannot be too small, otherwise the structural strength of the latching part 211 will be insufficient, and it will be easy to deform and break during assembly. The thickness T1 of the latching part 211 cannot be too large either, otherwise the latching part 211 will occupy more space at the end of the electrode group 1 in the second direction Y, reducing the battery space utilization rate. The thickness T2 of the first welding plate 23 cannot be too small, otherwise it will affect the battery's overcurrent capacity and the connection stability with the terminal 22. The thickness T2 of the first welding plate 23 cannot be too large either, otherwise the first welding plate 23 will be too thick, resulting in material waste.

[0064] See Figure 12In some embodiments, along the second direction Y, the distance between the surface of the snap-fit ​​portion 211 away from the electrode group 1 and the surface of the first welding plate 23 away from the cover plate body 21 (that is, the height of the snap-fit ​​portion 211 protruding from the first welding plate 23) is H1, and satisfies 5mm≤H1≤12mm, and the height of the snap-fit ​​portion 211 is H2, and satisfies 28mm≤H2≤50mm.

[0065] In this embodiment, the distance H1 between the surface of the snap-fit ​​part 211 away from the electrode group 1 and the surface of the first welding plate 23 away from the cover plate body 21 can be any value between 5mm and 12mm or any two values, such as 5mm, 6mm, 8mm, 10mm, 12mm, etc.; the height H2 of the snap-fit ​​part 211 can be any value between 28mm and 50mm or any two values, such as 28mm, 30mm, 40mm, 50mm, etc.

[0066] In this way, the protective portion 12 corresponding to the snap-fit ​​portion 211 protruding from the first welding plate 23 can have sufficient volume, which can improve the protection effect on the terminal post 22 and the first welding plate 23 while increasing the battery capacity. This prevents the terminal post 22 and the first welding plate 23 from being bumped and damaged during transportation, assembly and other processes, thereby improving the battery yield and safety. The snap-fit ​​portion 211 can also improve the structural strength of the cover plate body 21, making the stress on the cover plate body 21 more uniform. It is not easy to deform during the assembly process with the electrode group 1 and the shell 3, making the connection between the electrode group 1, the cover plate assembly 2 and the shell 3 more stable, thereby improving the stability of the battery. It also makes full use of the space at the end of the electrode group 1 in the second direction Y, thereby improving the battery capacity and assembly ratio.

[0067] Understandably, the distance H1 between the surface of the latching part 211 away from the electrode group 1 and the surface of the first welding plate 23 away from the cover body 21 cannot be too small. If it is too small, the protective effect of the latching part 211 on the first welding plate 23 and the terminal post 22 will be reduced, and the connection stability between the cover body 21 and the end of the electrode group 1 will be reduced. The distance H1 between the surface of the latching part 211 away from the electrode group 1 and the surface of the first welding plate 23 away from the cover body 21 cannot be too large. If it is too large, it will occupy more external space, reduce space utilization, and be not conducive to the assembly of the terminal post 22 and the connection with external circuits. The height H2 of the latching part 211 cannot be too small. If it is too small, it will be difficult to form effective protection for the first welding plate 23 and the terminal post 22, which will be not conducive to increasing the battery capacity. The height H2 of the latching part 211 cannot be too large either. If it is too large, it will increase the overall volume of the battery.

[0068] See Figure 6In some embodiments, the protective part 12 is provided with a first welding plate 23 and a first plastic 25 on both sides in the first direction X. Along the first direction X, the length of the cover body 21 is A, the distance between the surfaces of the first plastic 25 on both sides of the snap-fit ​​part 211 is L2, and satisfies 6mm≤A-L2≤16mm. The width of the snap-fit ​​part 211 is L1, and satisfies 0.25≤L1 / A≤0.5.

[0069] In this embodiment, the surface of the first plastic 25 facing away from the snap-fit ​​portion 211 is spaced apart from the surface of the cover plate body 21 facing away from the snap-fit ​​portion 211. That is, along the first direction X, the width of the first plastic 25 is less than the width of the position where the mounting groove 13 is opened on the cover plate body 21. The difference between the length A of the cover plate body 21 and the distance L2 between the mutually distant surfaces of the first plastic 25 on both sides of the snap-fit ​​portion 211 can be any value between 6mm and 16mm or any two values, such as 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, etc. The ratio of the width L1 of the snap-fit ​​portion 211 to the length A of the cover plate body 21 can be any value between 0.25 and 0.5 or any two values, such as 0.25, 0.3, 0.4, 0.5, etc.

[0070] In this way, not only can the snap-fit ​​part 211 have sufficient structural strength to improve the connection stability between the cover plate body 21 and the electrode group 1, but the space on both sides of the snap-fit ​​part 211 can also be fully utilized to set the electrode post 22 and the first welding plate 23, the second welding plate 24, the first plastic 25 and the second plastic 26 connected to the electrode post 22, thereby improving the space utilization rate of the cover plate body 21, making the overall structure of the cover plate assembly 2 more compact, leaving enough assembly space on both sides of the snap-fit ​​part 211, which is convenient for the battery to be connected to the external circuit or for multiple batteries to be connected, thereby improving the battery capacity and assembly ratio.

[0071] Understandably, the difference between the length A of the cover plate body 21 and the distance L2 between the mutually distant surfaces of the first plastic 25 on both sides of the latching portion 211 cannot be too small. If it is too small, the first plastic 25 and the first welding plate 23 will be close to the edge of the cover plate body 21, making them prone to collisions with the outside world and reducing the protective effect on the pole post 22 and the first welding plate 23. Conversely, the difference between the length A of the cover plate body 21 and the distance L2 between the mutually distant surfaces of the first plastic 25 on both sides of the latching portion 211 cannot be too large. If it is too large, it will cause the pole post 22 and the first welding plate to be squeezed out. In the assembly space of 23, the various structures of the cover plate assembly 2 are prone to assembly interference, which affects the current carrying capacity of the cover plate assembly 2; the ratio of the width L1 of the snap-fit ​​part 211 to the length A of the cover plate body 21 cannot be too small, otherwise the size of the snap-fit ​​part 211 and the protection part 12 will be too small, which is not conducive to the improvement of battery power. The ratio of the width L1 of the snap-fit ​​part 211 to the length A of the cover plate body 21 cannot be too large, otherwise the size of the snap-fit ​​part 211 will be too large, which will occupy the assembly space on both sides of the snap-fit ​​part 211 and reduce the space utilization rate.

[0072] See Figure 12 In some embodiments, along the third direction Z, the width of the snap-fit ​​portion 211 away from the end of the housing 3 is W1, and satisfies 0.6≤W1 / B1≤0.9, the length of the mounting groove 13 away from the cover plate body 21 is W2, and the width of the cover plate body 21 corresponding to the position of the mounting groove 13 is B2, and satisfies 0.3≤W2 / B2≤0.55.

[0073] In this embodiment, the edge of the snap-fit ​​part 211 on the side away from the end of the housing 3 in the third direction Z is chamfered. The ratio of the width W1 of the snap-fit ​​part 211 on the side away from the end of the housing 3 to the width B1 of the snap-fit ​​part 211 on the side facing the end of the housing 3 can be any value between 0.6 and 0.9 or any two values, such as 0.6, 0.7, 0.8, 0.9, etc. The ratio of the length W2 of the mounting groove 13 on the side away from the cover plate body 21 to the width B2 of the cover plate body 21 at the position of the mounting groove 13 can be any value between 0.3 and 0.55 or any two values, such as 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, etc.

[0074] Thus, the snap-fit ​​part 211 has a chamfer on the side opposite to the end of the housing 3, which facilitates the quick assembly of the cover body 21 to the electrode group 1 and reduces the damage to the electrode group 1 during the assembly process, thereby improving the assembly efficiency of the cover body 21. The snap-fit ​​part 211 snaps into the protective part 12, and the snap-fit ​​part 1 snaps into the cover body 21, which can limit the relative position of the cover body 21 and the end of the electrode group 1, improve the stability and structural strength of the battery, and improve the protection effect on the terminal post 22 and the first welding plate 23, so as to avoid the terminal post 22 and the first welding plate 23 from being bumped and damaged during transportation, assembly and other processes. The first welding plate 23 is snapped into the assembly groove 13, which can increase the conductive area of ​​the first welding plate 23, which is conducive to realizing a stable electrical connection between the battery and the external circuit and between multiple batteries.

[0075] Understandably, the ratio of the width W1 of the snap-fit ​​portion 211 on the side away from the end of the housing 3 to the width B1 of the snap-fit ​​portion 211 on the side facing the end of the housing 3 cannot be too small. If it is too small, the volume of the protection part 12 and the snap-fit ​​portion 211 will be reduced, affecting the increase in battery capacity. Conversely, the ratio of the width W1 of the snap-fit ​​portion 211 on the side away from the end of the housing 3 to the width B1 of the snap-fit ​​portion 211 on the side facing the end of the housing 3 cannot be too large. If it is too large, it will occupy too much space at the end of the electrode group 1, reduce the space utilization of the cover assembly 2, and be detrimental to the assembly of the terminal post 22 and the connection with the outside world. Circuit connection; The ratio of the length W2 of the assembly groove 13 away from the cover plate body 21 to the width B2 of the cover plate body 21 corresponding to the position of the assembly groove 13 should not be too small. If it is too small, the snap-fit ​​effect between the cover plate body 21 and the pole group 1 will be reduced, which will reduce the connection stability between the cover plate assembly 2 and the pole group 1. The ratio of the length W2 of the assembly groove 13 away from the cover plate body 21 to the width B2 of the cover plate body 21 corresponding to the position of the assembly groove 13 should not be too large. If it is too large, it will encroach on the space of the pole post 22 at the end of the pole group 1 and reduce the structural strength of the end of the pole group 1.

[0076] To verify the following parameters: the distance H1 between the surface of the latching part 211 away from the electrode assembly 1 and the surface of the first welding plate 23 away from the cover plate body 21; the height H2 of the latching part 211; the difference between the length A of the cover plate body 21 and the distance L2 between the mutually distancing surfaces of the first plastic 25 on both sides of the latching part 211; the ratio of the width L1 of the latching part 211 to the length A of the cover plate body 21; the difference between the width B1 of the latching part 211 facing the end of the housing 3 and the width B2 of the cover plate body 21 where the mounting groove 13 is located; and the latching part... The ratio of the width W1 of the side of the snap-fit ​​part 211 away from the end of the housing 3 to the width B1 of the side of the snap-fit ​​part 211 facing the end of the housing 3, the ratio of the length W2 of the mounting groove 13 away from the cover plate body 21 to the width B2 of the cover plate body 21 corresponding to the position of the mounting groove 13, the included angle N of the two groove walls of the mounting groove 13 in the third direction Z, the thickness T1 of the snap-fit ​​part 211, and the reasonableness of the thickness T2 range of the first welding plate 23 are shown in Table 1. This embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0077] Table 1

[0078]

[0079] As can be seen from Examples 1 to 6 in Table 1, after the range limitation is met, the battery yield meets the requirements, and there are no abnormalities such as mismatch between the cover assembly 2 and the shell 3 or poor battery structural strength. The cover assembly 2, electrode group 1, electrode tab 11, shell 3 and other structures are all undamaged and undeformed, and the overcurrent capacity of the cover assembly 2 meets the battery requirements.

[0080] As can be seen from Comparative Example 1, when the difference between the length A of the cover plate body 21 and the distance L2 between the surfaces of the first plastic 25 on both sides of the snap-fit ​​part 211 that are far apart is too small, the battery yield does not meet the requirements. The distance between the outer edge of the first welding plate 23 and the edge of the cover plate body 21 is insufficient, and it cannot effectively protect the terminal post 22 and the first welding plate 23.

[0081] As can be seen from Comparative Example 2, when the difference between the length A of the cover plate body 21 and the distance L2 between the surfaces of the first plastic 25 on both sides of the snap-fit ​​part 211 that are far apart is too large, the battery yield does not meet the requirements. The distance between the outer edge of the first welding plate 23 and the edge of the cover plate body 21 is too large, and the size of the pole post 22 and the first welding plate 23 is limited, which cannot meet the battery fast charging overcurrent requirements.

[0082] As can be seen from Comparative Example 3, when the ratio of the width L1 of the latching part 211 to the length A of the cover body 21 is too small, the battery yield does not meet the requirements. The insufficient width ratio of the latching part 211 leads to a reduction in the size of the latching part 211, which in turn reduces the size of the corresponding protection part 12 and affects the increase in battery capacity.

[0083] As can be seen from Comparative Example 4, when the ratio of the width L1 of the snap-fit ​​part 211 to the length A of the cover plate body 21 is too large, the battery yield does not meet the requirements. When the width of the snap-fit ​​part 211 is too large, the size of the first welding plate 23 and the terminal post 22 is limited, and the battery fast charging overcurrent requirement cannot be met.

[0084] As can be seen from Comparative Example 5, when the ratio of the width W1 of the snap-fit ​​part 211 away from the end of the housing 3 to the width B1 of the snap-fit ​​part 211 towards the end of the housing 3 is too small, the battery yield will not meet the requirements. The length of the snap-fit ​​part 211 is insufficient, which leads to a reduction in the size of the snap-fit ​​part 211, reduces the size of the protection part 12, and affects the increase in battery capacity.

[0085] As can be seen from Comparative Example 6, when the ratio of the width W1 of the snap-fit ​​part 211 away from the end of the housing 3 to the width B1 of the snap-fit ​​part 211 facing the end of the housing 3 is too large, the battery yield does not meet the requirements. The distance between the edge of the first welding plate 23 and the edge of the cover plate body 21 is too large, the chamfer is too small, and the battery is prone to damage during packaging and assembly, which reduces the battery safety protection level.

[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery, characterized in that, include: A pole assembly (1) is provided with a tab (11) and a protective part (12) connected to its end. A mounting groove (13) is provided at the end of the pole assembly (1). The mounting groove (13) and the protective part (12) are arranged along a first direction (X). The tab (11) is at least partially disposed in the mounting groove (13). The cover plate assembly (2) includes a cover plate body (21) and a pole post (22). The cover plate body (21) is provided with a snap-fit ​​part (211) corresponding to the position of the protective part (12) so that the cover plate body (21) snaps with the pole group (1). The pole post (22) is disposed on the cover plate body (21) and connected to the pole ear (11). Along the second direction (Y), the snap-fit ​​part (211) is disposed away from the surface of the pole group (1) and protrudes from the pole post (22). The housing (3) and the cover plate body (21) enclose a space for accommodating the pole group (1); The first direction (X) is the length direction of the cover body (21), and the second direction (Y) is the height direction of the cover body (21).

2. The battery according to claim 1, characterized in that, The pole group (1) is connected to a first protrusion (14) and a second protrusion (15). The first protrusion (14) and the second protrusion (15) are both disposed on the side of the pole group (1). One end of the second protrusion (15) is connected to the first protrusion (14), and the other end is connected to the protective part (12).

3. The battery according to claim 1, characterized in that, The housing (3) includes a first half-shell (31) and a second half-shell (32). The first half-shell (31) and the second half-shell (32) are centrally symmetrically arranged on the pole group (1). The first half-shell (31), the second half-shell (32), and the cover plate body (21) enclose a space for accommodating the pole group (1).

4. The battery according to claim 1, characterized in that, The pole group (1) has two mounting slots (13) at its end. The two mounting slots (13) are symmetrically arranged on both sides of the protective part (12) in the first direction (X). Each mounting slot (13) has a pole post (22) on both sides in the third direction (Z). The third direction (Z) is the width direction of the cover plate body (21).

5. The battery according to claim 4, characterized in that, The two walls of the assembly groove (13) in the third direction (Z) are inclined. The length of the assembly groove (13) on the side facing the end face of the pole group (1) is less than the length on the side facing away from the end face of the pole group (1). The included angle between the two walls of the assembly groove (13) in the third direction (Z) is N, and satisfies 16°≤N≤60°. And / or, along the third direction (Z), the width of the snap-fit ​​part (211) on the side facing the end of the housing (3) is B1, and the width of the cover plate body (21) at the position of the assembly groove (13) is B2, and satisfies 16mm≤B1-B2≤70mm.

6. The battery according to claim 1, characterized in that, The cover plate assembly (2) further includes a first welding plate (23), which is disposed on the side of the cover plate body (21) away from the pole group (1) and is snapped into the cover plate body (21). The pole post (22) is connected to the first welding plate (23). Along the second direction (Y), the surface of the snap-fit ​​part (211) away from the pole group (1) protrudes from the surface of the first welding plate (23) away from the cover plate body (21).

7. The battery according to claim 6, characterized in that, Along the second direction (Y), the thickness of the snap-fit ​​portion (211) is T1, and satisfies 1mm≤T1≤2mm; and / or, the thickness of the first welding plate (23) is T2, and satisfies 2mm≤T2≤3.5mm.

8. The battery according to claim 6, characterized in that, Along the second direction (Y), the distance between the surface of the snap-fit ​​part (211) facing away from the pole group (1) and the surface of the first welding plate (23) facing away from the cover plate body (21) is H1, and satisfies 5mm≤H1≤12mm; and / or, the height of the snap-fit ​​part (211) is H2, and satisfies 28mm≤H2≤50mm.

9. The battery according to claim 6, characterized in that, The cover plate assembly (2) further includes a first plastic (25), which is disposed between the first welding plate (23) and the cover plate body (21). The protective part (12) is provided with a first welding plate (23) and a first plastic (25) on both sides of the first direction (X). Along the first direction (X), the length of the cover plate body (21) is A, and the distance between the surfaces of the first plastic (25) on both sides of the snap-fit ​​part (211) that are far apart from each other is L2, and satisfies 6mm≤A-L2≤16mm; and / or, the width of the snap-fit ​​part (211) is L1, and satisfies 0.25≤L1 / A≤0.

5.

10. The battery according to any one of claims 1-9, characterized in that, Along the third direction (Z), the width of the snap-fit ​​part (211) away from the end of the housing (3) is W1, and the width of the snap-fit ​​part (211) towards the end of the housing (3) is B1, and satisfies 0.6≤W1 / B1≤0.9, where the third direction (Z) is the width direction of the cover plate body (21); and / or, the length of the mounting groove (13) away from the side of the cover plate body (21) is W2, and the width of the cover plate body (21) corresponding to the position of the mounting groove (13) is B2, and satisfies 0.3≤W2 / B2≤0.55.

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