A battery

Abstract

This invention belongs to the field of battery technology and discloses a battery including two electrode groups arranged along a first direction, a cover plate assembly, and a housing. The two electrode groups are electrically connected, and the ends of the electrode groups are connected to tabs and a first mounting portion. The tabs and the first mounting portion are spaced apart, and the first mounting portion extends along a second direction. 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 first mounting portion to snap-fit ​​the cover plate body with the electrode group. The terminal post is disposed on the cover plate body and connected to the tab. Along the first direction, the snap-fit ​​portion protrudes from the surface of the electrode group and is disposed on the terminal post. The housing includes two half-shells, each corresponding to one of the two electrode groups. The two half-shells are respectively connected to the corresponding cover plate bodies and enclose a space for accommodating the electrode groups. The first direction is the thickness direction of the cover plate body, and the second direction is the length direction of the cover plate body. This invention can improve the protection effect on the terminal post and the structural strength of the battery, and increase the battery capacity and assembly ratio.

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, with the rivet blocks and terminals protruding from the cover plate, resulting in poor protection. The rivet blocks and terminals are easily bumped and damaged during transportation and assembly, affecting battery yield and safety. Furthermore, the connection stability between the electrode assembly and the cover plate assembly is poor, resulting in low structural strength of the battery. The electrode sheets are easily damaged or shifted during the electrode assembly insertion process, leading to low overall space utilization of the battery, affecting battery capacity and assembly ratio, and hindering the improvement of battery power. Summary of the Invention

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

[0006] To achieve this objective, the present invention adopts the following technical solution: A battery includes: two electrode groups arranged along a first direction, electrically connected, with tabs and a first mounting portion connected to the ends of the electrode groups, the tabs and the first mounting portion being spaced apart, and the first mounting portion extending along a second direction; a cover plate assembly including a cover plate body and a terminal post, the cover plate body having a snap-fit ​​portion corresponding to the position of the first mounting portion to snap-fit ​​the cover plate body with the electrode group, the terminal post being disposed on the cover plate body and connected to the tabs, and the snap-fit ​​portion protruding from the terminal post away from the surface of the electrode group along the first direction; and a housing including two half-shells, the two half-shells respectively corresponding to the two electrode groups, the two half-shells respectively being connected to the corresponding cover plate bodies and enclosing a space for accommodating the electrode groups; the first direction is the thickness direction of the cover plate body, and the second direction is the length direction of the cover plate body.

[0007] Preferably, the electrode assembly has a first protrusion and a second protrusion on its side in the third direction, the second protrusion being disposed on the side of the first protrusion facing the electrode tab, and the electrode assembly has a third protrusion on its side in the second direction; the third direction is the width direction of the cover plate body.

[0008] Preferably, along the first direction, the length of the half-shell corresponding to the second protrusion is H2, the total length of the half-shell is F, and 0.15≤H2 / F≤0.5; and / or, along the third direction, the width of the half-shell corresponding to the third protrusion is W2, the total height of the half-shell is B, and 0.25≤W2 / B≤0.5.

[0009] Preferably, along the second direction, the width of the half-shell corresponding to the second protrusion is L1, the total width of the half-shell is A1, and satisfies 0.3≤L1 / A1≤0.7; and / or, the sum of the total width of the half-shell and the height of the half-shell corresponding to the third protrusion is A2, and satisfies 16mm≤A2-A1≤60mm.

[0010] Preferably, the third protrusion extends along the first direction, and the end of the third protrusion facing the electrode tab is connected to an inclined portion, and the height of the inclined portion gradually decreases in the second direction along the direction close to the electrode tab.

[0011] Preferably, the inclined portions are symmetrically arranged on the two sides of the pole group in the second direction. In the second direction, the included angle of the inclined surfaces of the inclined portions located on both sides of the pole group is N2, and satisfies 12°≤N2≤60°.

[0012] Preferably, the end of the half-shell facing the cover plate body is provided with a positioning protrusion, and the cover plate body is provided with a groove corresponding to the position of the positioning protrusion, so that the cover plate body and the half-shell are engaged.

[0013] Preferably, the third direction is the width direction of the cover plate body. Along the third direction, the length of the positioning protrusion away from the cover plate body is W1, and satisfies 10mm≤W1≤20mm. Along the first direction, the height of the positioning protrusion is H1, and satisfies 4mm≤H1≤10mm. And / or, the positioning protrusion is inclined on the side of the third direction, and the included angle between the two sides of the positioning protrusion in the third direction is N1, and satisfies 16°≤N1≤90°.

[0014] Preferably, one of the two half-shells has a limiting protrusion on its side facing the other, and the other half has a step corresponding to the position of the limiting protrusion, so that the two half-shells can be interlocked.

[0015] Preferably, the third direction is the width direction of the cover plate body, and along the third direction, the thickness of the limiting protrusion is T1, and satisfies 0.55mm≤T1≤1mm; and / or, the thickness of the step is T2, and satisfies 0.3mm≤T2≤0.6mm.

[0016] The beneficial effects of this invention are: A battery includes two electrode groups arranged along a first direction, a cover plate assembly, and a housing. The two electrode groups are electrically connected, and the ends of the electrode groups are connected to tabs and a first mounting portion. The tabs and the first mounting portion are spaced apart, and the first mounting portion extends along a second direction. 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 first mounting portion to snap-fit ​​the cover plate body with the electrode group. The terminal post is disposed on the cover plate body and connected to the tab. Along the first direction, the snap-fit ​​portion protrudes from the surface of the electrode group and is disposed on the terminal post. The housing includes two half-shells, each half-shell corresponding to one of the two electrode groups. The two half-shells are respectively connected to the corresponding cover plate bodies and enclose a space for accommodating the electrode groups. The first direction is the thickness direction of the cover plate body, and the second direction is the length direction of the cover plate body.

[0017] Thus, the first and second assembly parts not only improve battery capacity but also enhance the structural strength of the electrode assembly ends and the connection stability between the electrode assembly and the cover plate assembly. The snap-fit ​​part protrudes from the electrode post, improving the protection of the electrode post and the first welding plate, preventing bumps and damage during transportation and assembly processes, thus improving battery yield and safety. Furthermore, it provides sufficient assembly space on both sides of the first assembly part to accommodate the electrode post, improving space utilization. The two half-shells correspond to two electrode assemblies, improving assembly efficiency and facilitating the assembly of the electrode assemblies into the shell, preventing damage and movement of the electrode sheets, and enhancing battery stability. 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 first structure of the pole group in one embodiment of the present invention; Figure 3 This is a schematic diagram of the second structure of the pole group in one embodiment of the present invention; Figure 4 This is a first exploded view of the cover plate assembly in one embodiment of the present invention; Figure 5 This is a second exploded view of the cover plate assembly in one embodiment of the present invention; Figure 6 This is an exploded view of the housing in one embodiment of the present invention; Figure 7 This is a front view of the pole group in one embodiment of the present invention; Figure 8 This is a top view of the pole group in one embodiment of the present invention; Figure 9 This is one embodiment of the present invention. Figure 8 Enlarged view of point A; Figure 10 This is a side view of the casing.

[0019] In the picture: 1. Pole assembly; 11. Pole lug; 12. First assembly part; 13. First protrusion; 14. Second protrusion; 15. Third protrusion; 16. Inclined part; 17. Second assembly part; 18. Clearance groove; 2. Cover plate assembly; 21. Cover plate body; 211. Snap-fit ​​part; 212. Groove; 22. Pole post; 23. First welding plate; 24. Second welding plate; 25. First plastic; 26. Second plastic; 3. Housing; 31. Half-shell; 311. Positioning protrusion; 312. Limiting protrusion; 313. Step; 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 6 This invention provides a battery comprising two electrode groups 1 arranged along a first direction X, a cover plate assembly 2, and a housing 3. The two electrode groups 1 are electrically connected, and the ends of the electrode groups 1 are connected to tabs 11 and first mounting portions 12. The tabs 11 and the first mounting portions 12 are spaced apart, and the first mounting portions 12 extend along a second direction Y. The cover plate assembly 2 includes a cover plate body 21 and a terminal post 22. The cover plate body 21 is provided with a snap-fit ​​portion 211 at a position corresponding to the first mounting portion 12, so that the cover plate body 21 is snap-fitted to the electrode group 1. The terminal post 22 is disposed on the cover plate body 21 and connected to the tabs 11. Along the first direction X, the snap-fit ​​portion 211 protrudes from the surface of the electrode group 1 and is disposed on the terminal post 22. The housing 3 includes two half-shells 31, which are respectively disposed corresponding to the two electrode groups 1. The two half-shells 31 are respectively connected to the corresponding cover plate bodies 21 and enclose a space for accommodating the electrode groups 1. The first direction X is the thickness direction of the cover plate body 21, and the second direction Y is the length direction of the cover plate body 21.

[0025] In this embodiment, two electrode groups 1 are symmetrically arranged. The surfaces of the two electrode groups 1 that are close to each other are provided with conductive coatings (not shown in the figure), and clearance grooves 18 are formed on the surfaces of the two electrode groups 1 that are close to each other. The conductive coatings on both sides of the clearance groove 18 have opposite polarities, so that the two electrode groups 1 are connected in series. The clearance grooves 18 prevent short circuits. Two tabs 11 are provided at the ends of the electrode groups 1, respectively located on both sides of the first assembly part 12. The first assembly part 12 is integrally formed with the electrode groups 1 to improve battery capacity. The shape of the snap-fit ​​part 211 is adapted to the shape of the first assembly part 12, so that the cover plate body 21 fits snugly with the ends of the electrode groups 1. The two half-shells 31 are fixedly and sealed together by laser welding, and the ends of the two half-shells 31 that are far apart from each other are fixedly and sealed together with the cover plate body 21 by laser welding.

[0026] Further, see Figures 3 to 5In some embodiments, the end of the electrode assembly 1 is provided with two second assembly parts 17. The two second assembly parts 17 are disposed on both sides of the first assembly part 12 and are integrally formed with the first assembly part 12 and the electrode assembly 1. The first assembly part 12 and the second assembly part 17 form a cross-shaped protective structure. The electrode tabs 11 are disposed around the second assembly parts 17. One electrode tab 11 is connected to two electrode posts 22. The cover plate assembly 2 also 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 cover plate body. 21 is located on the side opposite to the electrode group 1. The snap-fit ​​part 211 protrudes from the surface of the electrode group 1 and is provided on the side of the cover plate body 21 facing the electrode group 1. The electrode post 22 passes through the first welding plate 23, the cover plate body 21, and the second welding plate 24 in sequence and is electrically connected to the electrode tab 11. The first plastic 25 is provided between the first welding plate 23 and the cover plate body 21, and the second plastic 26 is provided between the second welding plate 24 and the cover plate body 21. The cover plate body 21 is provided with an explosion-proof valve at the position corresponding to the first assembly part 12.

[0027] Thus, the first assembly part 12 and the second assembly part 17 can not only improve the battery capacity, but also improve the structural strength of the end of the electrode group 1 and improve the connection stability between the electrode group 1 and the cover plate assembly 2. The snap-fit ​​part 211 protrudes from the electrode post 22, which can improve the protection effect of the electrode post 22 and the first welding plate 23, avoid bumps and damage during transportation, assembly and other processes, improve battery yield and safety, and make the first assembly part 12 have sufficient assembly space on both sides to set the electrode post 22, improving space utilization. The two half shells 31 are set for the two electrode groups 1, which can improve assembly efficiency, facilitate the assembly of the electrode group 1 into the shell 3, avoid damage and displacement of the electrode sheets, and improve battery stability.

[0028] See Figure 1 and Figure 2 In some embodiments, the electrode assembly 1 has a first protrusion 13 and a second protrusion 14 on the side in the third direction Z, the second protrusion 14 is disposed on the side of the first protrusion 13 facing the electrode tab 11, and the electrode assembly 1 has a third protrusion 15 on the side in the second direction Y; the third direction Z is the width direction of the cover plate body 21.

[0029] In this embodiment, the first protrusion 13, the second protrusion 14, and the third protrusion 15 are all integrally formed with the electrode assembly 1. The first protrusion 13, the second protrusion 14, and the third protrusion 15 all extend along the first direction X. One end of the second protrusion 14 is connected to the first protrusion 13, and the other end is flush with the end face of the electrode assembly 1 facing the cover body 21. The end face of the first protrusion 13 away from the cover body 21 and the end face of the third protrusion 15 away from the cover body 21 are both flush with the end face of the electrode assembly 1 away from the cover body 21 (that is, the end face where the conductive coating is applied) to improve the overall power of the battery. The half-shell 31 is fitted with the first protrusion 13, the second protrusion 14, and the third protrusion 15 to achieve the snap-fit ​​between the electrode assembly 1 and the half-shell 31.

[0030] In this way, the side space of the electrode assembly 1 can be fully utilized, improving the structural strength of the side of the electrode assembly 1 while increasing the battery capacity. Furthermore, the first protrusion 13, the second protrusion 14, and the third protrusion 15 are engaged with the half-shell 31, which can improve the connection stability between the electrode assembly 1 and the half-shell 31, and increase the battery capacity and assembly ratio. The first protrusion 13, the second protrusion 14, and the third protrusion 15 are less likely to interfere with the assembly of the cover plate assembly 2, so that the battery end has enough space to connect with external circuits or other batteries, making the battery structure more compact.

[0031] It is understandable that the shape and position of the first protrusion 13, the second protrusion 14 and the third protrusion 15 can be adjusted according to actual needs, as long as it can improve the structural strength of the side of the electrode group 1 and the battery capacity. No further details are provided here.

[0032] See Figures 7 to 10 In some embodiments, along the first direction X, the length of the half-shell 31 corresponding to the second protrusion 14 is H2, and the total length of the half-shell 31 is F, satisfying 0.15≤H2 / F≤0.5. Along the third direction Z, the half-shell 31 corresponds to the third protrusion 15 (see...). Figure 3 The width of the position is W2, the total height of the half shell 31 is B, and the condition 0.25≤W2 / B≤0.5 is met.

[0033] In this embodiment, the ratio of the length H2 of the half-shell 31 corresponding to the second protrusion 14 to the total length F of the half-shell 31 can be any value between 0.15 and 0.5 or any range between any two values, such as 0.15, 0.2, 0.3, 0.4, 0.5, etc.; the ratio of the width W2 of the half-shell 31 corresponding to the third protrusion 15 to the total height B of the half-shell 31 can be any value between 0.25 and 0.5 or any range between any two values, such as 0.25, 0.3, 0.4, 0.5, etc.

[0034] In this way, there is a sufficient distance between the first protrusion 13 and the cover assembly 2 to avoid assembly interference, and the first protrusion 13 is stably engaged with the half shell 31, improving the stability of the electrode assembly 1 in the housing 3. The third protrusion 15 can improve the structural strength of the electrode assembly 1 in the third direction Z, making the battery structure more compact.

[0035] Understandably, the ratio of the length H2 of the half-shell 31 corresponding to the second protrusion 14 to the total length F of the half-shell 31 cannot be too small. If it is too small, the first protrusion 13 will be too small, which is not conducive to improving the power capacity. The ratio of the length H2 of the half-shell 31 corresponding to the second protrusion 14 to the total length F of the half-shell 31 cannot be too large either. If it is too large, the overall volume of the battery will increase, which is not conducive to the processing and shaping of the half-shell 31. Similarly, the ratio of the width W2 of the half-shell 31 corresponding to the third protrusion 15 to the total height B of the half-shell 31 cannot be too small. If it is too small, the third protrusion 15 will be too narrow, resulting in low structural strength. The ratio of the width W2 of the half-shell 31 corresponding to the third protrusion 15 to the total height B of the half-shell 31 cannot be too large either. If it is too large, the overall volume of the battery will increase, affecting the space utilization rate.

[0036] See Figure 2 and Figure 7 In some embodiments, along the second direction Y, the width of the half shell 31 corresponding to the position of the second protrusion 14 is L1, the total width of the half shell 31 is A1, and satisfies 0.3≤L1 / A1≤0.7, the sum of the total width of the half shell 31 and the height of the half shell 31 corresponding to the position of the third protrusion 15 is A2, and satisfies 16mm≤A2-A1≤60mm.

[0037] In this embodiment, the second protrusion 14 is disposed in the middle of the half shell 31. The ratio of the width L1 of the half shell 31 corresponding to the position of the second protrusion 14 to the total width A1 of the half shell 31 can be any value between 0.3 and 0.7 or any two values, such as 0.3, 0.4, 0.5, 0.6, 0.7, etc. The difference between the sum A2 of the total width of the half shell 31 and the height of the half shell 31 corresponding to the position of the third protrusion 15 and the total width A1 of the half shell 31 (that is, the sum of the heights of the two third protrusions 15) can be any value between 16mm and 60mm or any two values, such as 16mm, 20mm, 30mm, 40mm, 50mm, 60mm, etc.

[0038] Thus, the second protrusion 14 is spaced from the edge of the half-shell 31, which can improve the battery capacity while ensuring a stable connection between the shell 3 and the electrode assembly 1, thereby increasing the structural strength of the shell 3, reducing the deformation of the shell 3 during assembly, as well as the damage and movement of the electrode sheets, and thus improving the battery yield and safety. The first protrusion 13 and the second protrusion 14 can improve the structural strength of the electrode assembly 1 in the third direction Z, and the third protrusion 15 can improve the structural strength of the electrode assembly 1 in the second direction Y. The first assembly part 12 and the second assembly part 17 can improve the structural strength of the end of the electrode assembly 1, so that the electrode assembly 1 is stably connected to the shell 3 and the cover plate assembly 2.

[0039] Understandably, the ratio of the width L1 of the half-shell 31 corresponding to the second protrusion 14 to the total width A1 of the half-shell 31 cannot be too small. If it is too small, the second protrusion 14 will be too small, which is not conducive to improving the battery capacity. The ratio of the width L1 of the half-shell 31 corresponding to the second protrusion 14 to the total width A1 of the half-shell 31 cannot be too large either. If it is too large, the second protrusion 14 will occupy too much space, which is not conducive to the processing and shaping of the half-shell 31. The difference between the sum of the total width of the half-shell 31 and the height of the half-shell 31 corresponding to the third protrusion 15, A2, and the total width A1 of the half-shell 31 cannot be too small. If it is too small, the height of the third protrusion 15 will be too small, which is not conducive to the snapping of the electrode group 1 with the half-shell 31. The difference between the sum of the total width of the half-shell 31 and the height of the half-shell 31 corresponding to the third protrusion 15, A2, and the total width A1 of the half-shell 31 cannot be too large either. If it is too large, the battery will be too large, which will affect the compactness of the battery structure.

[0040] See Figure 2 In some embodiments, the third protrusion 15 extends along the first direction X, and the end of the third protrusion 15 facing the tab 11 is connected to an inclined portion 16. Along the direction close to the tab 11, the height of the inclined portion 16 in the second direction Y gradually decreases.

[0041] In this embodiment, along the third direction Z, the width of the third protrusion 15 and the width of the inclined portion 16 are equal, and both the third protrusion 15 and the inclined portion 16 are disposed in the middle of the pole group 1.

[0042] In this way, the end of the third protrusion 15 can smoothly transition to the electrode assembly 1, making the electrode assembly 1 more evenly stressed and further increasing the battery capacity. When the electrode assembly 1 is assembled into the half-shell 31, the inclined part 16 helps to guide and position the electrode assembly 1, improving assembly efficiency.

[0043] See Figure 2 and Figure 7 In some embodiments, the inclined portions 16 are symmetrically arranged on two sides of the pole group 1 in the second direction Y. In the second direction Y, the included angle of the inclined surfaces of the inclined portions 16 located on both sides of the pole group 1 is N2, and satisfies 12°≤N2≤60°.

[0044] In this embodiment, the included angle N2 of the inclined surfaces of the inclined portions 16 located on both sides of the pole group 1 can be any value between 12° and 60° or any range between any two values, such as 12°, 20°, 30°, 40°, 50°, 60°, etc.

[0045] In this way, the inclined part 16 engages with the half shell 31, which can restrict the position of the electrode group 1 inside the shell 3, prevent the position of the electrode group 1 from shifting in the point direction, improve the connection stability between the electrode group 1 and the shell 3, improve the battery yield and safety, and avoid excessive occupation of the space on the side of the electrode group 1, so as to reserve more space for multiple batteries to be connected to each other.

[0046] Understandably, the angle N2 of the inclined surfaces of the inclined portions 16 on both sides of the electrode group 1 cannot be too small. If it is too small, the inclined portion 16 will be small in size, resulting in poor limiting effect and poor power enhancement effect. The angle N2 of the inclined surfaces of the inclined portions 16 on both sides of the electrode group 1 cannot be too large either. If it is too large, it will occupy too much space and will not be conducive to the connection of multiple batteries.

[0047] See Figure 1 and Figure 8 In some embodiments, the end of the half shell 31 facing the cover plate body 21 is provided with a positioning protrusion 311, and the cover plate body 21 is provided with a groove 212 corresponding to the position of the positioning protrusion 311, so that the cover plate body 21 and the half shell 31 are engaged.

[0048] In this embodiment, two positioning protrusions 311 are provided. The two positioning protrusions 311 are symmetrically arranged on the middle of the side surface of the half shell 31 in the second direction Y. The positioning protrusions 311 extend along the third direction Z. The shape of the groove 212 is adapted to the shape of the positioning protrusions 311.

[0049] Thus, when the cover plate assembly 2 is assembled into the half shell 31, the cover plate body 21 can be quickly positioned into the half shell 31. The positioning protrusion 311 engages with the groove 212, which can limit the relative position of the cover plate body 21 and the half shell 31, so that the pole group 1 can be protected by the shell 3 and the cover plate body 21, and improve the protection effect on the pole post 22 and the first welding plate 23.

[0050] Understandably, the number and location of the positioning protrusions 311 can be adjusted according to actual needs, which will not be elaborated here.

[0051] See Figure 1 and Figure 8In some embodiments, along the third direction Z, the length of the positioning protrusion 311 away from the cover plate body 21 is W1, and satisfies 10mm≤W1≤20mm. Along the first direction X, the height of the positioning protrusion 311 is H1, and satisfies 4mm≤H1≤10mm. The side of the positioning protrusion 311 in the third direction Z is inclined, and the included angle between the two sides of the positioning protrusion 311 in the third direction Z is N1, and satisfies 16°≤N1≤90°.

[0052] In this embodiment, the positioning protrusion 311 is a trapezoidal plate structure. The width of the end of the positioning protrusion 311 facing the cover plate body 21 is smaller than the width of the end facing away from the cover plate body 21. The length W1 of the side of the positioning protrusion 311 facing away from the cover plate body 21 can be any value between 10mm and 20mm or any range between any two values, such as 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc. The height H1 of the positioning protrusion 311 can be any value between 4mm and 10mm or any range between any two values, such as 4mm, 6mm, 8mm, 10mm, etc. The included angle N1 of the two sides of the positioning protrusion 311 in the third direction Z can be any value between 16° and 90° or any range between any two values, such as 16°, 30°, 50°, 70°, 90°, etc.

[0053] Thus, the positioning protrusion 311 can improve the connection strength between the cover body 21 and the half shell 31, so that after the cover body 21 and the half shell 31 are welded, they can provide protection for the electrode group 1 and restrict the position of the electrode group 1, thereby improving the battery yield, safety and structural strength.

[0054] Understandably, the length W1 of the positioning protrusion 311 on the side away from the cover plate body 21 and the height H1 of the positioning protrusion 311 cannot be too small. If they are too small, the positioning protrusion 311 will be too small, which will not be conducive to the engagement with the groove 212. The length W1 of the positioning protrusion 311 on the side away from the cover plate body 21 and the height H1 of the positioning protrusion 311 cannot be too large. If they are too large, the positioning protrusion 311 will be too large, which will not be conducive to the processing of the half shell 31. The included angle N1 of the two sides of the positioning protrusion 311 in the third direction Z cannot be too small. If it is too small, it will not be conducive to the alignment and positioning when the positioning protrusion 311 engages with the groove 212, which will reduce the assembly efficiency. The included angle N1 of the two sides of the positioning protrusion 311 in the third direction Z cannot be too large. If it is too large, it will result in a poor engagement effect between the cover plate body 21 and the half shell 31.

[0055] It should be noted that the total length F of the half shell 31 is the sum of the length of the half shell 31 and the height of the positioning protrusion 311, and the total width A1 of the half shell 31 is the sum of the width of the half shell 31 and the thickness of the positioning protrusion 311.

[0056] See Figure 9In some embodiments, one of the two half-shells 31 is provided with a limiting protrusion 312 on the side facing the other, and the other half is provided with a step 313 at the position corresponding to the limiting protrusion 312, so that the two half-shells 31 are snapped together.

[0057] In this embodiment, the limiting protrusion 312 overlaps with the step 313, and the limiting protrusion 312 protrudes from the half shell 31.

[0058] In this way, by making full use of the space in the thickness direction of the half shell 31 to set the limiting protrusion 312 and the step 313, the space utilization of the shell 3 is improved. The limiting protrusion 312 and the step 313 are engaged, which can improve the assembly efficiency of the two half shells 31 and improve the structural strength of the connection between the two half shells 31, and avoid the electrode sheet being damaged and shifting during the process of inserting the electrode group 1 into the shell.

[0059] It is understandable that the position of the limit protrusion 312 can be adjusted according to actual needs, which will not be elaborated here.

[0060] See Figure 9 In some embodiments, along the third direction Z, the thickness of the limiting protrusion 312 is T1, and satisfies 0.55mm≤T1≤1mm, and the thickness of the step 313 is T2, and satisfies 0.3mm≤T2≤0.6mm.

[0061] In this embodiment, the thickness T1 of the limiting protrusion 312 can be any value between 0.55mm and 1mm or any range between any two values, such as 0.55mm, 0.75mm, 0.95mm, 1mm, etc.; the thickness T2 of the step 313 can be any value between 0.3mm and 0.6mm or any range between any two values, such as 0.3mm, 0.4mm, 0.5mm, 0.6mm, etc.

[0062] In this way, the step 313 can overlap with the limiting protrusion 312 and restrict the relative position of the two half shells 31, which is conducive to the stable connection between the shell 3 and the electrode assembly 1, improving the battery yield and safety, preventing the electrode assembly 1 from being damaged or shifting during the shell insertion process, and improving the protection effect of the electrode assembly 1.

[0063] Understandably, the thickness T1 of the limiting protrusion 312 cannot be too small, otherwise the structural strength of the half-shell 31 will be insufficient. The thickness T1 of the limiting protrusion 312 cannot be too large either, otherwise the overall volume of the battery will increase, which is not conducive to improving space utilization. The thickness T2 of the step 313 cannot be too small, otherwise the structural strength of the step 313 will be insufficient and it will be easy to deform during welding. The thickness T2 of the step 313 cannot be too large either, otherwise it will be not conducive to the step 313 and the limiting protrusion 312 engaging, reducing the connection stability between the step 313 and the limiting protrusion 312.

[0064] To verify the rationality of the following parameters: the height H1 of the positioning protrusion 311, the ratio of the length H2 of the half-shell 31 corresponding to the second protrusion 14 to the total length F of the half-shell 31, the ratio of the width L1 of the half-shell 31 corresponding to the second protrusion 14 to the total width A1 of the half-shell 31, the difference between the total width of the half-shell 31 and the sum of the heights of the half-shell 31 and the third protrusion 15 (A2) and the total width A1 of the half-shell 31, the length W1 of the positioning protrusion 311 on the side away from the cover plate body 21, the ratio of the width W2 of the half-shell 31 corresponding to the third protrusion 15 to the total height B of the half-shell 31, the included angle N1 of the two sides of the positioning protrusion 311 in the third direction Z, the included angle N2 of the inclined surfaces of the inclined portions 16 on both sides of the pole group 1, the thickness T1 of the limiting protrusion 312, and the thickness T2 of the step 313, as shown in Table 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0065] 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, and there are no abnormalities such as mismatched positioning of cover plate assembly 2 and shell 3 or poor strength. The cover plate assembly 2, shell 3, electrode group 1, electrode tab 11 and other structures are all undamaged and undeformed.

[0066] As can be seen from Comparative Example 1, when the ratio of the width L1 of the half-shell 31 corresponding to the position of the second protrusion 14 to the total width A1 of the half-shell 31 is too small, the battery yield does not meet the requirements, and the width of the second protrusion 14 is insufficient, which affects the increase in battery capacity.

[0067] As can be seen from Comparative Example 2, when the ratio of the width L1 of the half shell 31 corresponding to the position of the second protrusion 14 to the total width A1 of the half shell 31 is too large, the battery yield does not meet the requirements. The width of the second protrusion 14 is too large, which is not conducive to the processing of the shell 3 and increases the cost of the shell 3.

[0068] As can be seen from Comparative Example 3, when the sum of the total width of the half-shell 31 and the height of the third protrusion 15 of the half-shell 31, A2, is less than the difference between the total width of the half-shell 31, A1, the battery yield does not meet the requirements. The height of the third protrusion 15 is insufficient, which reduces the overall size of the electrode group 1 and affects the increase in battery capacity.

[0069] As can be seen from Comparative Example 4, when the sum of the total width of the half-shell 31 and the height of the third protrusion 15 of the half-shell 31, A2, is too large, the difference between the total width of the half-shell 31, A1, and the battery yield does not meet the requirements. The height of the third protrusion 15 is too large, which increases the difficulty of stamping the shell 3 and increases the cost of the parts.

[0070] As can be seen from Comparative Example 5, when the ratio of the width W2 of the half-shell 31 corresponding to the third protrusion 15 to the total height B of the half-shell 31 is too small, the battery yield does not meet the requirements. The width of the third protrusion 15 is insufficient, which reduces the overall size of the electrode group 1 and affects the increase in battery capacity.

[0071] As can be seen from Comparative Example 6, when the ratio of the width W2 of the half-shell 31 corresponding to the third protrusion 15 to the total height B of the half-shell 31 is too large, the battery yield does not meet the requirements. The third protrusion 15 has an excessively large proportion, which increases the difficulty of stamping the shell 3 and increases the cost of parts.

[0072] 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: Two pole groups (1) are arranged along a first direction (X), the two pole groups (1) are electrically connected, the ends of the pole groups (1) are connected to a tab (11) and a first assembly part (12), the tab (11) and the first assembly part (12) are spaced apart, and the first assembly part (12) extends along a second direction (Y); 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 first assembly part (12) so that the cover plate body (21) is snap-fitted to 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 first direction (X), 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), each half-shell (31) is respectively disposed corresponding to the two pole groups (1), and each half-shell (31) is respectively connected to the corresponding cover plate body (21) and encloses to form a space for accommodating the pole group (1); The first direction (X) is the thickness direction of the cover plate body (21), and the second direction (Y) is the length direction of the cover plate body (21).

2. The battery according to claim 1, characterized in that, The pole group (1) has a first protrusion (13) and a second protrusion (14) on the side in the third direction (Z), the second protrusion (14) is located on the side of the first protrusion (13) facing the pole tab (11), and the pole group (1) has a third protrusion (15) on the side in the second direction (Y). The third direction (Z) is the width direction of the cover plate body (21).

3. The battery according to claim 2, characterized in that, Along the first direction (X), the length of the half-shell (31) corresponding to the position of the second protrusion (14) is H2, the total length of the half-shell (31) is F, and satisfies 0.15≤H2 / F≤0.5; and / or, along the third direction (Z), the width of the half-shell (31) corresponding to the position of the third protrusion (15) is W2, the total height of the half-shell (31) is B, and satisfies 0.25≤W2 / B≤0.

5.

4. The battery according to claim 2, characterized in that, Along the second direction (Y), the width of the half shell (31) corresponding to the position of the second protrusion (14) is L1, the total width of the half shell (31) is A1, and satisfies 0.3≤L1 / A1≤0.7; and / or, the sum of the total width of the half shell (31) and the height of the half shell (31) corresponding to the position of the third protrusion (15) is A2, and satisfies 16mm≤A2-A1≤60mm.

5. The battery according to claim 2, characterized in that, The third protrusion (15) extends along the first direction (X), and the end of the third protrusion (15) facing the tab (11) is connected to an inclined portion (16). Along the direction close to the tab (11), the height of the inclined portion (16) in the second direction (Y) gradually decreases.

6. The battery according to claim 5, characterized in that, The inclined portion (16) is symmetrically arranged on the two sides of the pole group (1) in the second direction (Y). In the second direction (Y), the included angle of the inclined surface of the inclined portion (16) located on both sides of the pole group (1) is N2, and satisfies 12°≤N2≤60°.

7. The battery according to claim 1, characterized in that, The end of the half shell (31) facing the cover plate body (21) is provided with a positioning protrusion (311), and the cover plate body (21) is provided with a groove (212) corresponding to the positioning protrusion (311) so that the cover plate body (21) and the half shell (31) are engaged.

8. The battery according to claim 7, characterized in that, The third direction (Z) is the width direction of the cover plate body (21). Along the third direction (Z), the length of the positioning protrusion (311) away from the cover plate body (21) is W1, and satisfies 10mm≤W1≤20mm. Along the first direction (X), the height of the positioning protrusion (311) is H1, and satisfies 4mm≤H1≤10mm. And / or, the positioning protrusion (311) is inclined on the side of the third direction (Z), and the included angle between the two sides of the positioning protrusion (311) in the third direction (Z) is N1, and satisfies 16°≤N1≤90°.

9. The battery according to claim 1, characterized in that, One of the two half-shells (31) has a limiting protrusion (312) on its side facing the other, and the other half has a step (313) at the position corresponding to the limiting protrusion (312) so that the two half-shells (31) can be snapped together.

10. The battery according to claim 9, characterized in that, The third direction (Z) is the width direction of the cover plate body (21). Along the third direction (Z), the thickness of the limiting protrusion (312) is T1, and satisfies 0.55mm≤T1≤1mm; and / or, the thickness of the step (313) is T2, and satisfies 0.3mm≤T2≤0.6mm.

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