A type of battery

Abstract

This invention belongs to the field of battery technology and discloses a battery including an electrode assembly, a cover plate assembly, and a housing. The electrode assembly has tabs and an assembly part connected to its end. An assembly groove is formed at the end of the electrode assembly, and the assembly groove and assembly part are arranged along a first direction. At least part of the tab is disposed within the assembly groove. The cover plate assembly includes a cover plate body and a terminal post. A snap-fit ​​part is provided on the cover plate body corresponding to the position of the assembly part to snap the cover plate body with the electrode assembly. The terminal post is disposed on the cover plate body and connected to the tab. Along a second direction, the snap-fit ​​part protrudes from the surface of the electrode assembly and is disposed on the terminal post. The housing includes two half-shells, both of which are connected to the cover plate body. The two half-shells 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. Thus, the assembly part can improve the overall battery capacity and the protection effect on the terminal post, improve the space utilization of the cover plate body, and make the battery structure 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. In addition, the structural strength of the cover plate and the shell is low, and the connection stability between the electrode assembly and the shell and cover plate is poor. This can easily lead to damage or displacement of the electrode sheets during the process of pushing the electrode assembly into the shell, affecting the battery capacity and assembly ratio. Furthermore, the internal space utilization of the shell is low, which is not conducive to improving the battery's capacity. Summary of the Invention

[0005] The purpose of this invention is to provide a battery that solves the problems of low structural strength, low space utilization, and poor protection of the terminals by the cover plate.

[0006] To achieve this objective, the present invention adopts the following technical solution: A battery includes: an electrode assembly, wherein an electrode tab and an assembly portion are connected to the end of the electrode assembly, and an assembly groove is formed at the end of the electrode assembly, the assembly groove and the assembly 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 assembly 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 includes two half-shells, both of which are connected to the cover plate body, and the two half-shells 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.

[0007] Preferably, the electrode assembly has a first protrusion and a second protrusion symmetrically arranged on two sides in the third direction. The first protrusion and the second protrusion are integrally formed with the electrode assembly. The half-shell includes a connecting part and a flat part. The shape of the connecting part is adapted to the side shape of the electrode assembly where the first protrusion and the second protrusion are arranged, so that the connecting part can be engaged with the electrode assembly. The flat part is provided on the surface of the electrode assembly in the first direction. The third direction is the width direction of the cover plate body.

[0008] Preferably, along the third direction, the protrusion height of the housing corresponding to the second protrusion is H, and satisfies 8mm≤H≤40mm; and / or, along the first direction, the width of the housing corresponding to the second protrusion is L, and the total width of the housing is A, and satisfies 0.25≤L / A≤0.55.

[0009] Preferably, along the second direction, the length of the housing corresponding to the position of the first protrusion is W, the total length of the housing is E, and satisfies 0.5≤W / E≤0.75.

[0010] Preferably, along the third direction, the thickness of the connecting portion is T2, and satisfies 0.3mm≤T2≤0.8mm; and / or, along the first direction, the thickness of the planar portion is T1, and satisfies 0.15mm≤T1-T2≤0.45mm.

[0011] Preferably, along the first direction, the total width of the housing is A, and satisfies 90mm≤A≤300mm; and / or, along the third direction, the total height of the housing is B, and satisfies 60mm≤B≤120mm.

[0012] Preferably, the electrode assembly has a first protrusion and two second protrusions on its third-direction side. The two second protrusions are symmetrically arranged on both sides of the first protrusion in the second direction. One end of each second protrusion is integrally formed with the first protrusion, and the other end is integrally formed with the assembly part.

[0013] Preferably, the housing is connected to an explosion-proof valve, which is disposed on at least one of the flat portions.

[0014] Preferably, a limiting portion is provided on the side of the half-shell facing the pole group, and one half-shell abuts against the limiting portion provided on the other half-shell.

[0015] Preferably, along a third direction, the height of the limiting portion is F, and satisfies 0.6mm ≤ F ≤ 1.2mm, where the third direction is the width direction of the cover plate body; and / or, along the first direction, the width of the limiting portion is K, and satisfies 0.48mm. 2 ≤F*L≤1.44mm 2 .

[0016] The beneficial effects of this invention are: A battery includes an electrode assembly, a cover plate assembly, and a housing. The electrode assembly has tabs and a mounting portion connected to its ends. A mounting groove is formed at the end of the electrode assembly. The mounting groove and the mounting portion are arranged along a first direction. At least part of the tabs are disposed in the mounting groove. The cover plate assembly includes a cover plate body and a terminal post. The cover plate body has a snap-fit ​​portion at a position corresponding to the mounting portion to snap-fit ​​the cover plate body to 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 includes two half-shells, both of which are connected to the cover plate body. The two half-shells 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.

[0017] In this way, the assembly section can improve the overall capacity of the battery, protect the terminals on both sides, prevent the terminals from being bumped and damaged during transportation and assembly, improve battery yield and safety, improve battery space utilization, make the overall battery structure more compact, and improve the stability of the connection between the electrode assembly and the cover plate body, prevent the electrode assembly from being damaged and shifting during assembly, improve battery capacity and assembly ratio, facilitate the interconnection between multiple batteries, and improve battery packing rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery structure in one embodiment of the present invention; Figure 2 This is a schematic diagram of the pole group structure in one embodiment of the present invention; Figure 3 This is a schematic diagram of the shell structure in one embodiment of the present invention; Figure 4 This is an exploded view of a cover plate assembly according to an embodiment of the present invention; Figure 5 This is a side view of the housing in one embodiment of the present invention; Figure 6 This is a front view of the housing in one embodiment of the present invention; Figure 7 This is a bottom view of the housing in one embodiment of the present invention; Figure 8 This is a side view of the half-shell in one embodiment of the present invention; Figure 9This is a schematic diagram of the half-shell structure in one embodiment of the present invention; Figure 10 This is one embodiment of the present invention. Figure 9 Enlarged view of point A; Figure 11 This is a partial cross-sectional view of the half-shell in one embodiment of the present invention.

[0019] In the picture: 1. Pole assembly; 11. Pole lug; 12. Assembly part; 13. Assembly groove; 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. Half-shell; 311. Connecting part; 312. Flat part; 313. Limiting part; 32. Explosion-proof valve; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] See Figures 1 to 4 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 an assembly part 12 connected to its end. An assembly groove 13 is provided at the end of the electrode assembly 1. The assembly groove 13 and the assembly part 12 are 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 assembly part 12 to snap-fit ​​the cover plate body 21 with 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 includes two half-shells 31, both of which are connected to the cover plate body 21. The two half-shells 31 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.

[0025] In this embodiment, the assembly part 12 is disposed in the middle of the end of the electrode assembly 1 and is integrally formed with the electrode assembly 1. The assembly part 12 extends along the third direction Z, which is the width direction of the cover plate body 21. Two assembly grooves 13 are opened at the end of the electrode assembly 1, and the assembly part 12 is disposed between the two assembly grooves 13. The shape of the electrode lug 11 is adapted to the shape of the end face of the electrode assembly 1 where the assembly groove 13 is located. The snap-fit ​​part 211 is fitted with the assembly part 12. The electrode post 22 is connected to the two electrode lugs 11 located on the third direction Z of the assembly groove 13. That is, the electrode post 22 is disposed on the end face of the electrode assembly 1. The two half shells 31 have the same shape and are both "L"-shaped plate structures. The two half shells 31 are centrally symmetrically disposed on the electrode assembly 1. The connection between the two half shells 31 is fixed and sealed by welding. The half shells 31 and the cover plate body 21 are fixed and sealed by welding to protect the electrode assembly 1.

[0026] Furthermore, in some embodiments, the cover plate assembly 2 further includes a first welding plate 23, a second welding plate 24, a first plastic 25, and a second plastic 26. The first welding plate 23 is disposed on the side of the cover plate body 21 away from the electrode group 1 and riveted to the electrode post 22. The second welding plate 24 is disposed on the side of the cover plate body 21 facing the electrode group 1 and welded to the electrode post 22. The electrode tab 11 is connected to the second welding plate 24 to limit the relative position of the electrode post 22 and the cover plate assembly 2 and to achieve a stable electrical connection between the battery and the external circuit. 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 so that the cover plate body 21 is insulated from both the first welding plate 23 and the second welding plate 24. The first welding plate 23 and the second welding plate 24 are both made of conductive material, and the first plastic 25 and the second plastic 26 are both made of insulating material.

[0027] Thus, by setting the assembly part 12, not only can the overall capacity of the battery be improved, but the stability of the connection between the cover plate body 21 and the electrode group 1 can also be improved, avoiding damage and movement of the electrode group 1 during the assembly process, improving the battery capacity and assembly ratio. Furthermore, the space of the cover plate body 21 can be fully utilized, allowing the assembly part 12 to provide protection for the electrode posts 22 and the first welding plate 23 located on both sides, preventing the electrode posts 22 from being bumped and damaged during transportation, assembly and other processes, improving the battery yield and safety, and improving the battery space utilization rate, making the overall battery structure more compact, and facilitating the connection of multiple batteries, thereby improving the battery packing rate.

[0028] See Figure 2 In some embodiments, the pole group 1 has a first protrusion 14 and a second protrusion 15 symmetrically arranged on two sides in the third direction Z. The first protrusion 14 and the second protrusion 15 are integrally formed with the pole group 1. The half shell 31 includes a connecting part 311 and a flat part 312. The shape of the connecting part 311 is adapted to the side shape of the pole group 1 where the first protrusion 14 and the second protrusion 15 are arranged, so that the connecting part 311 is engaged with the pole group 1. The flat part 312 is arranged on the surface of the pole group 1 in the first direction X.

[0029] In this embodiment, the first protrusion 14 and the second protrusion 15 both extend along the second direction Y. The connecting part 311 of the half shell 31 is arranged perpendicular to the third direction Z, the flat part 312 is arranged perpendicular to the first direction X, and the connecting part 311 and the flat part 312 are integrally formed. The half shell 31 is attached to the side of the electrode assembly 1.

[0030] Thus, the first protrusion 14 and the second protrusion 15 can not only improve the overall power and assembly ratio of the battery, but also make full use of the side space of the electrode group 1 in the third direction Z, and improve the structural strength of the electrode group 1 and the connection stability between the electrode group 1 and the shell 3, thereby improving the overall structural strength of the battery and making the battery structure more compact. The splicing of the two half shells 31 can facilitate the assembly of the electrode group 1 with concave and convex surfaces, and improve the assembly effect.

[0031] See Figure 5 and Figure 6 In some embodiments, along the third direction Z, the protrusion height of the housing 3 corresponding to the second protrusion 15 is H, and satisfies 8mm≤H≤40mm. Along the first direction X, the width of the housing 3 corresponding to the second protrusion 15 is L, and the total width of the housing 3 is A, and satisfies 0.25≤L / A≤0.55.

[0032] In this embodiment, along the third direction Z, the heights of the first protrusion 14 and the second protrusion 15 are equal. The protrusion height H of the housing 3 corresponding to the position of the second protrusion 15 can be any value between 8mm and 40mm or any range between any two values, such as 8mm, 10mm, 20mm, 30mm, 40mm, etc. The ratio of the width L of the housing 3 corresponding to the position of the second protrusion 15 to the total width A of the housing 3 can be any value between 0.25 and 0.55 or any range between any two values, such as 0.25, 0.3, 0.4, 0.5, 0.55, etc.

[0033] In this way, the space of the electrode group 1 in the third direction Z can be fully utilized, the space utilization rate of the housing 3 can be improved, the battery capacity and assembly ratio can be increased, and the housing 3 can be stably engaged with the first protrusion 14 and the second protrusion 15, thereby improving the connection stability between the housing 3 and the electrode group 1 and between the housing 3 and the cover plate assembly 2. This avoids the reduction of the protective effect on the pole post 22 and the first welding plate 23 due to the deformation of the cover plate body 21, thereby improving the battery yield and safety.

[0034] It is understandable that the protrusion height H of the housing 3 corresponding to the second protrusion 15 position cannot be too small. If it is too small, the structural strength of the second protrusion 15 and the corresponding housing 3 will be low, which is not conducive to the stable connection between the housing 3 and the electrode group 1. The protrusion height H of the housing 3 corresponding to the second protrusion 15 position cannot be too large either. If it is too large, it will increase the overall volume of the battery and reduce the space utilization rate.

[0035] See Figure 6 and Figure 7 In some embodiments, along the second direction Y, the length of the housing 3 corresponding to the position of the first protrusion 14 is W, the total length of the housing 3 is E, and satisfies 0.5≤W / E≤0.75.

[0036] In this embodiment, the ratio of the length W of the housing 3 corresponding to the first protrusion 14 to the total length E of the housing 3 can be any value between 0.5 and 0.75 or any range between any two values, such as 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, etc.

[0037] In this way, the first protrusion 14 can have sufficient volume to increase the overall capacity of the battery, and the first protrusion 14 can be stably engaged with the housing 3, improving the connection stability between the housing 3 and the electrode group 1, avoiding damage and movement of the electrode group 1 and the housing 3 during assembly, thereby limiting the relative position of the electrode group 1 with the housing 3 and the cover plate assembly 2, and ensuring that the position of the assembly part 12 of the electrode group 1 is stably connected with the engaging part 211, thereby improving the protection effect on the pole post 22 and the first welding plate 23, improving the overall structural strength of the battery, and making full use of the space on the side of the electrode group 1 in the third direction Z, improving the space utilization rate, making the battery structure more compact, and facilitating the connection of multiple batteries in groups.

[0038] Understandably, the ratio of the length W of the housing 3 corresponding to the first protrusion 14 to the total length E of the housing 3 cannot be too small. If it is too small, the volume of the first protrusion 14 will be small, which is not conducive to increasing the battery's capacity. The ratio of the length W of the housing 3 corresponding to the first protrusion 14 to the total length E of the housing 3 cannot be too large. If it is too large, the first protrusion 14 will occupy too much space and is prone to assembly interference with other structures, reducing the assembly effect.

[0039] See Figure 8 In some embodiments, along the third direction Z, the thickness of the connecting portion 311 is T2, and satisfies 0.3mm≤T2≤0.8mm, and along the first direction X, the thickness of the planar portion 312 is T1, and satisfies 0.15mm≤T1-T2≤0.45mm.

[0040] In this embodiment, the thickness of the planar portion 312 is greater than the thickness of the connecting portion 311. The thickness T2 of the connecting portion 311 can be any value between 0.3mm and 0.8mm or any range between two values, such as 0.3mm, 0.4mm, 0.6mm, 0.8mm, etc. The difference between the thickness T1 of the planar portion 312 and the thickness T2 of the connecting portion 311 can be 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, etc.

[0041] Thus, the planar portion 312 can have greater structural strength to support and protect the electrode assembly 1, prevent the casing 3 from deforming after the battery is subjected to external forces, improve the connection stability between the casing 3 and the cover plate assembly 2, limit the relative position between the cover plate body 21 and the electrode assembly 1, improve the connection strength between the assembly portion 12 and the snap-fit ​​portion 211, and improve the protective effect of the assembly portion 12 on the electrode post 22 and the first welding plate 23, so as to prevent the electrode post 22 and the first welding plate 23 from being bumped and damaged during transportation, assembly and other processes.

[0042] Understandably, the thickness T2 of the connecting part 311 cannot be too small, otherwise the structural strength of the connecting part 311 will be insufficient, making it prone to deformation and damage. The thickness T2 of the connecting part 311 cannot be too large either, otherwise the volume of the shell 3 will be too large, reducing space utilization and hindering heat dissipation. The difference between the thickness T1 of the planar part 312 and the thickness T2 of the connecting part 311 cannot be too small, otherwise the structural strength of the planar part 312 will be insufficient, making it prone to assembly interference and deformation with the first protrusion 14 and the second protrusion 15 during assembly. The difference between the thickness T1 of the planar part 312 and the thickness T2 of the connecting part 311 cannot be too large either, otherwise it will reduce the assembly effect and occupy too much space on the outside of the pole group 1.

[0043] See Figure 5 In some embodiments, along the first direction X, the total width of the housing 3 is A, and satisfies 90mm≤A≤300mm, and along the third direction Z, the total height of the housing 3 is B, and satisfies 60mm≤B≤120mm.

[0044] In this embodiment, the total width A of the housing 3 can be any value between 90mm and 300mm or any range between any two values, such as 90mm, 100mm, 150mm, 200mm, 250mm, 300mm, etc.; the total height B of the housing 3 can be any value between 60mm and 120mm or any range between any two values, such as 60mm, 80mm, 100mm, 120mm, etc.

[0045] In this way, the casing 3 and the electrode assembly 1 can have a suitable volume, which can not only increase the battery capacity, but also make the overall battery structure more compact, which is conducive to achieving stable electrical connection between multiple batteries and improving the battery packing rate. By limiting the height and width of the casing 3, the stress on the casing 3 can be more even, avoiding localized stress that could cause deformation or damage to the casing 3.

[0046] Understandably, the total width A and total height B of the casing 3 cannot be too small. If they are too small, the overall volume of the battery will be small, and the battery capacity and assembly ratio will be low. The total width A and total height of the casing 3 cannot be too large either. If they are too large, the battery volume will be too large, which will affect the space utilization of the battery and will not be conducive to the stable electrical connection between the battery and external circuits and other batteries.

[0047] See Figure 2 In some embodiments, the pole group 1 has a first protrusion 14 and two second protrusions 15 on the side in the third direction Z. The two second protrusions 15 are symmetrically arranged on both sides of the first protrusion 14 in the second direction Y. One end of the second protrusion 15 is integrally formed with the first protrusion 14, and the other end is integrally formed with the assembly part 12.

[0048] In this embodiment, the first protrusion 14 and the second protrusion 15 form a cross shape. Along the first direction X, the width of the second protrusion 15 is equal to the width of the assembly part 12. The two ends of the assembly part 12 are respectively connected to the second protrusion 15 provided on the two sides of the pole group 1.

[0049] In this way, by connecting the second protrusion 15 with both the assembly part 12 and the first protrusion 14, the structural strength of the electrode assembly 1 can be improved, and the connection stability between the electrode assembly 1 and the housing 3 and the cover plate assembly 2 can be improved, thereby improving the battery yield and safety. It is also beneficial for the assembly part 12 to protect the electrode posts 22 and the first welding plate 23 on both sides, avoiding collisions and damage to the electrode posts 22 and the first welding plate 23 during transportation, assembly and other processes, and making full use of the space on the side of the electrode assembly 1 in the third direction Z, thereby improving space utilization.

[0050] It is understood that the first protrusion 14 and the second protrusion 15 can be disposed on the same side of the electrode group 1 or on the adjacent surface of the electrode group 1. The number, shape and placement of the first protrusion 14 and the second protrusion 15 can be adjusted according to actual needs, as long as it can improve the connection stability between the electrode group 1 and the housing 3, as well as the battery capacity and assembly ratio, which will not be elaborated here.

[0051] See Figure 1 In some embodiments, the housing 3 is connected to an explosion-proof valve 32, which is correspondingly disposed on at least one flat portion 312. In this embodiment, an explosion-proof valve 32 is disposed in the middle of each flat portion 312.

[0052] It is understood that the number and location of the explosion-proof valves 32 can be adjusted according to actual needs. In this embodiment, the explosion-proof valves 32 are located on the flat part 312, which can make full use of the space of the flat part 312 and help to quickly discharge the gas inside the housing 3.

[0053] See Figure 2 and Figure 3 In some embodiments, a limiting part 313 is provided on the side of the half shell 31 facing the pole group 1, and one half shell 31 abuts against the limiting part 313 provided on the other half shell 31.

[0054] In this embodiment, the limiting part 313 is disposed on the edge of the connecting part 311. The limiting part 313 extends along the second direction Y. The limiting part 313 is disposed on the side of the connecting part 311 facing the planar part 312 of the other half shell 31. One half shell 31 is connected to two limiting parts 313. The two limiting parts 313 are disposed at positions corresponding to the second protrusion 15.

[0055] Thus, when the two half-shells 31 are assembled, the limiting part 313 provided on one half-shell 31 can abut against the other half-shell 31, thereby preventing the relative position of the two half-shells 31 from shifting, improving the assembly effect, and facilitating the fit of the half-shell 31 with the electrode assembly 1 and the engagement with the first protrusion 14 and the second protrusion 15, thereby improving the structural strength of the battery. At the same time, the limiting part 313 can also improve the structural strength of the connection between the two half-shells 31, preventing deformation during the welding and assembly process of the two half-shells 31.

[0056] It is understandable that the number and location of the limit parts 313 can be adjusted according to actual needs, and will not be elaborated here.

[0057] See Figures 9 to 11 In some embodiments, along the third direction Z, the height of the limiting portion 313 is F, and satisfies 0.6mm ≤ F ≤ 1.2mm; along the first direction X, the width of the limiting portion 313 is K, and satisfies 0.48mm. 2 ≤F*L≤1.44mm 2 .

[0058] In this embodiment, the height F of the limiting part 313 can be any value between 0.6mm and 1.2mm, or a range between any two values, such as 0.6mm, 0.8mm, 1mm, 1.2mm, etc.; the product of the height F of the limiting part 313 and the width K of the limiting part 313 (that is, the cross-sectional area of ​​the limiting part 313 perpendicular to the second direction Y) can be 0.48mm. 2 -1.44mm 2 Any value between or between any two values, for example, 0.48mm. 2 0.64mm 2 1.32mm 2 1.44mm 2 wait.

[0059] In this way, the limiting part 313 can have sufficient structural strength, improve the connection stability of the two half shells 31, enable the electrode group 1 to be stably connected with the cover plate, avoid damage and movement of the electrode group 1 when it is assembled with the shell 3, improve the stability and safety of the battery, and make the shell 3 have enough space to accommodate the electrode group 1, thereby increasing the battery capacity and assembly ratio.

[0060] Understandably, the height F of the limiting part 313 cannot be too small, as this would reduce the connection stability of the two half-shells 31. The height F of the limiting part 313 cannot be too large either, as this would occupy too much internal space of the shell 3, reduce space utilization, and affect battery capacity. The product of the height F of the limiting part 313 and the width K of the limiting part 313 cannot be too small, as this would make it difficult for the limiting part 313 to restrict the position of the half-shell 31 it abuts. The product of the height F of the limiting part 313 and the width K of the limiting part 313 cannot be too large either, as this would cause assembly interference with the electrode group 1.

[0061] To verify the rationality of the following ranges for the housing 3: the protrusion height H corresponding to the second protrusion 15, the ratio of the width L of the housing 3 corresponding to the second protrusion 15 to the total width A of the housing 3, the height F of the limiting part 313, the product of the height F of the limiting part 313 and the width K of the limiting part 313, the ratio of the length W of the housing 3 corresponding to the first protrusion 14 to the total length E of the housing 3, the thickness T2 of the connecting part 311, the difference between the thickness T1 of the flat part 312 and the thickness T2 of the connecting part 311, the total width A of the housing 3, and the total height B of the housing 3, as shown in Table 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0062] Table 1 As can be seen from Examples 1 to 6 in Table 1, after the range limitation is met, the battery yield meets the requirements. No abnormalities such as mismatch in position of cover assembly 2, shell 3, and electrode group 1, or poor structural strength are found. The shell 3, explosion-proof valve 32, electrode group 1, and electrode tab 11 are all undamaged and undeformed.

[0063] As can be seen from Comparative Example 1, when the ratio of the width L of the housing 3 corresponding to the second protrusion 15 to the total width A of the housing 3 is too small, the battery yield does not meet the requirements. The length ratio of the housing 3 corresponding to the first protrusion 14 and the second protrusion 15 is insufficient, which reduces the overall size of the electrode group 1 and affects the increase in battery capacity.

[0064] As can be seen from Comparative Example 2, when the ratio of the width L of the housing 3 corresponding to the second protrusion 15 to the total width A of the housing 3 is too large, the battery yield does not meet the requirements. The length ratio of the housing 3 corresponding to the first protrusion 14 and the second protrusion 15 is too large, which is not conducive to the processing of the housing 3 and increases the cost of the housing 3.

[0065] As can be seen from Comparative Example 3, when the product of the height F of the limiting part 313 and the width K of the limiting part 313 is too small, the battery yield does not meet the requirements. The cross-sectional size of the limiting part 313 is insufficient, resulting in low strength of the positioning structure of the half shell 31, which cannot guarantee the accurate positioning of the half shell 31.

[0066] As can be seen from Comparative Example 4, when the product of the height F and the width K of the limiting part 313 is too large, the battery yield does not meet the requirements. The cross-sectional size of the limiting part 313 is too large, which increases the difficulty of stamping the shell 3 and increases the cost of parts.

[0067] As can be seen from Comparative Example 5, when the ratio of the length W of the housing 3 corresponding to the first protrusion 14 to the total length E of the housing 3 is too small, the battery yield does not meet the requirements. The proportion of the first protrusion 14 is insufficient, which reduces the overall size of the electrode group 1 and affects the increase in battery capacity.

[0068] As can be seen from Comparative Example 6, when the ratio of the length W of the housing 3 corresponding to the first protrusion 14 to the total length E of the housing 3 is too large, the battery yield does not meet the requirements. The proportion of the first protrusion 14 is too large, which increases the difficulty of stamping the housing 3 and increases the cost of parts.

[0069] 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 by, include: A pole assembly (1) is provided with a tab (11) and an assembly part (12) connected to its end. An assembly groove (13) is provided at the end of the pole assembly (1). The assembly groove (13) and the assembly part (12) are 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 pole post (22). The cover plate body (21) is provided with a snap-fit ​​part (211) at the position corresponding to the assembly 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) includes two half-shells (31), both of which are connected to the cover plate body (21). The two half-shells (31) 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 of claim 1, wherein, The pole assembly (1) has a first protrusion (14) and a second protrusion (15) symmetrically arranged on two sides in the third direction (Z). The first protrusion (14) and the second protrusion (15) are integrally formed with the pole assembly (1). The half shell (31) includes a connecting part (311) and a flat part (312). The shape of the connecting part (311) is adapted to the side shape of the first protrusion (14) and the second protrusion (15) of the pole assembly (1) so that the connecting part (311) can be engaged with the pole assembly (1). The flat part (312) is provided on the surface of the pole assembly (1) in the first direction (X). The third direction (Z) is the width direction of the cover plate body (21).

3. The battery of claim 2, wherein, Along the third direction (Z), the protrusion height of the housing (3) corresponding to the second protrusion (15) is H, and satisfies 8mm≤H≤40mm; and / or, along the first direction (X), the width of the housing (3) corresponding to the second protrusion (15) is L, and the total width of the housing (3) is A, and satisfies 0.25≤L / A≤0.

55.

4. The battery of claim 2, wherein, Along the second direction (Y), the length of the housing (3) corresponding to the position of the first protrusion (14) is W, the total length of the housing (3) is E, and satisfies 0.5≤W / E≤0.

75.

5. The battery of claim 2, wherein, Along the third direction (Z), the thickness of the connecting portion (311) is T2, and satisfies 0.3mm≤T2≤0.8mm; and / or, along the first direction (X), the thickness of the planar portion (312) is T1, and satisfies 0.15mm≤T1-T2≤0.45mm.

6. The battery of claim 2, wherein, Along the first direction (X), the total width of the housing (3) is A, and satisfies 90mm≤A≤300mm; and / or, along the third direction (Z), the total height of the housing (3) is B, and satisfies 60mm≤B≤120mm.

7. The battery of claim 2, wherein, The pole assembly (1) has a first protrusion (14) and two second protrusions (15) on the side of the third direction (Z). The two second protrusions (15) are symmetrically arranged on both sides of the first protrusion (14) in the second direction (Y). One end of the second protrusion (15) is integrally formed with the first protrusion (14), and the other end is integrally formed with the assembly part (12).

8. The battery according to claim 2, characterized in that, The housing (3) is connected to an explosion-proof valve (32), which is disposed on at least one of the flat portions (312).

9. The battery according to any one of claims 1-8, characterized in that, The half-shell (31) is provided with a limiting part (313) on the side facing the pole group (1), and one of the half-shells (31) abuts against the limiting part (313) provided on the other half-shell (31).

10. The battery according to claim 9, characterized in that, In the third direction (Z), the height of the limiting portion (313) is F, and 0.6 mm≤F≤1.2 mm is satisfied, the third direction (Z) being the width direction of the cover plate body (21); and / or, in the first direction (X), the width of the limiting portion (313) is K, and 0.48 mm 2 ≤F*L≤1.44 mm 2 is satisfied.

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