A type of battery

Abstract

This invention belongs to the field of battery technology and discloses a battery including an electrode assembly, multiple tabs, multiple first assembly parts, multiple second assembly parts, a cover plate assembly, and a housing. The electrode assembly includes one first electrode group, two second electrode groups, and two third electrode groups. The first electrode group extends along a first direction, and the second and third electrode groups both extend along a second direction. The two second electrode groups are respectively disposed at both ends of the first electrode group in the first direction, and the two third electrode groups are respectively disposed on both sides of the first electrode group in the second direction, with the two third electrode groups located between the two second electrode groups. The second and third electrode groups are electrically connected to the first electrode group through a conductive coating. The multiple second assembly parts are respectively disposed on the side of the first assembly part opposite to its corresponding second or third electrode group. The multiple cover plate bodies are respectively disposed on the end faces of the second and third electrode groups where the tabs are located. This improves the structural strength and capacity of the battery.

Description

Technical Field

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

[0002] Lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage. As lithium-ion battery technology matures, the requirements for the performance and safety of lithium-ion batteries are also increasing.

[0003] In related technologies, a battery includes an electrode assembly, a housing, and a cover plate. The electrode assembly is disposed inside the housing, and the cover plate and the housing enclose a space for accommodating the electrode assembly. The electrode assembly has tabs at its ends, and the flat cover plate has posts and rivet blocks that are electrically connected to the tabs, so that the battery can be connected to an external circuit.

[0004] However, the terminals and rivet blocks usually protrude from the cover plate, occupying a lot of external space during battery module assembly and affecting the assembly rate. At the same time, the protective effect of the terminals and rivet blocks protruding from the cover plate is poor, and they are prone to bumps and damage during transportation, assembly and other processes, affecting battery yield and safety. Furthermore, the support between the terminal end and the cover plate is poor, and the terminal is prone to damage and movement during the insertion of the terminal into the casing. The space utilization rate of the terminal end is low, making it difficult to adapt to the assembly space of the car chassis. The increase in battery capacity is limited, and it is difficult to meet the demand for high capacity and high-rate fast charging. Summary of the Invention

[0005] The purpose of this invention is to provide a battery that solves the problems of limited capacity improvement, low structural strength, and low space utilization.

[0006] To achieve this objective, the present invention adopts the following technical solution: A battery includes: an electrode assembly comprising a first electrode assembly, two second electrode assemblies, and two third electrode assemblies; the first electrode assembly extending along a first direction, and the second and third electrode assemblies extending along a second direction; the two second electrode assemblies being respectively disposed at both ends of the first electrode assembly in the first direction, and the two third electrode assemblies being respectively disposed at both sides of the first electrode assembly in the second direction, with the two third electrode assemblies located between the two second electrode assemblies; the second and third electrode assemblies being electrically connected to the first electrode assembly via a conductive coating; a plurality of tabs, the plurality of tabs being respectively disposed at both ends of the second electrode assemblies and at one end of the third electrode assembly opposite to the first electrode assemblies; a plurality of first assembly portions and a plurality of second assembly portions, the plurality of first assembly portions being respectively disposed at... The first assembly comprises a second electrode group having an end face where the electrode tab is located, and a third electrode group having an end face where the electrode tab is located. Multiple second assembly parts are respectively located on the side of the first assembly part opposite to the corresponding second electrode group and third electrode group. A cover plate assembly includes multiple cover plate bodies and multiple pole posts. The multiple cover plate bodies are respectively located on the end faces where the electrode tabs are located in the second electrode group and the third electrode group. The cover plate bodies are engaged with the second assembly parts, and the pole posts are electrically connected to the electrode tabs. A housing and the cover plate bodies enclose a space for accommodating the first electrode group, the second electrode group, and the third electrode group. The first direction is the length direction of the first electrode group, and the second direction is the length direction of the second electrode group and the third electrode group.

[0007] Preferably, the width of the first assembly portion gradually decreases along the direction away from its corresponding connection to the second or third pole group; and / or, the width of the second assembly portion toward the first assembly portion is greater than its width away from the first assembly portion.

[0008] Preferably, the first assembly part is provided with two second assembly parts at intervals on the side opposite to the second pole group or the third pole group to which it is connected, and an assembly groove is formed between the two assembly parts. The electrode tab is disposed in the assembly groove, and the pole post is disposed at the position corresponding to the electrode tab.

[0009] Preferably, the first assembly part is provided with two inclined surfaces, which are located on both sides of the first assembly part in the width direction of the second pole group or the third pole group to which it is connected. The electrode tab is provided on the inclined surface, and the pole post is positioned corresponding to the electrode tab.

[0010] Preferably, the angle between the two inclined surfaces is N1, and satisfies 70°≤N1≤120°; and / or, the angle between the length direction of the third pole group and the length direction of the first pole group is N2, and satisfies 75°≤N2≤105°.

[0011] Preferably, the side surface of the second electrode group and the end surface of the third electrode group are each provided with two conductive coatings at intervals, and the side surface and end surface of the first electrode group are provided with conductive coatings corresponding to the positions of the second electrode group and the third electrode group.

[0012] Preferably, the thickness of the first electrode group is B, and satisfies 25mm≤B≤118mm; and / or, the distance between the two conductive coatings disposed at the ends of the first electrode group is K, and satisfies 0.15≤K / B≤0.3.

[0013] Preferably, along the second direction, the height of the first assembly part is H, and satisfies 25mm≤H≤90mm; and / or, the surface distance between the two first assembly parts disposed in the second pole group that are far apart from each other is L, and the width of the second pole group is A1, and satisfies 0.25≤L / A1≤0.6.

[0014] Preferably, the width of the first pole group is A2, the width of the second pole group is A1, and the condition 0.6≤A2 / A1≤1 is met; and / or, the distance between the third pole group and the second pole groups on both sides is equal, the distance between the third pole group and the second pole group along the first direction is F, the length of the first pole group and the sum of the widths of the two second pole groups is E2, and the condition 0.33≤2*F / E2≤0.5 is met.

[0015] Preferably, along the second direction, the length of the conductive coating disposed on the second electrode group is W1, the distance between the mutually distant end faces of the second mounting portions disposed at both ends of the second electrode group is E1, and satisfies 0.1≤W1 / E1≤0.25; and / or, along the first direction, the length of the conductive coating at the connection between the first electrode group and the third electrode group is W2, the width of the second electrode group is A1, and satisfies 4mm≤W2-A1≤10mm.

[0016] The beneficial effects of this invention are: A battery includes an electrode assembly, multiple tabs, multiple first assembly portions, multiple second assembly portions, a cover assembly, and a housing. The first electrode assembly extends along a first direction, and the second and third electrode assemblies both extend along a second direction. Two second electrode assemblies are respectively disposed at both ends of the first electrode assembly in the first direction, and two third electrode assemblies are respectively disposed on both sides of the first electrode assembly in the second direction, with the two third electrode assemblies located between the two second electrode assemblies. The second and third electrode assemblies are electrically connected to the first electrode assembly through a conductive coating. Multiple tabs are respectively disposed at both ends of the second electrode assembly and at one end of the third electrode assembly opposite to the first electrode assembly. The multiple first assembly portions are respectively provided with... The first assembly has multiple second assembly parts disposed on the end faces of the second and third electrode groups, respectively, away from the corresponding second and third electrode groups. The cover plate assembly includes multiple cover plate bodies and multiple pole posts. The multiple cover plate bodies are respectively disposed on the end faces of the second and third electrode groups, respectively. The cover plate bodies are snapped into the second assembly parts, and the pole posts are electrically connected to the electrode ears. The housing and the cover plate bodies enclose a space for accommodating the first, second, and third electrode groups. The first direction is the length direction of the first electrode group, and the second direction is the length direction of the second and third electrode groups.

[0017] Thus, by setting up the first assembly section and the second assembly section, not only can the battery capacity be increased, but the structural strength of the ends of the second and third electrode groups can also be improved, enhancing the protection of the terminals located at the ends of the second and third electrode groups and preventing the terminals from being bumped or damaged during transportation and assembly processes. The second and third electrode groups are connected to the first electrode group through a conductive coating, which not only facilitates assembly but also saves on the arrangement of connection structures, making full use of the internal space of the casing, increasing the battery capacity increase, and enabling the battery to adapt to the structural space of the car chassis. The separate design of the first, second, and third electrode groups facilitates processing and assembly, improves the stability of the first, second, and third electrode groups within the casing, and thus improves battery yield and safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the first structure of a battery in one embodiment of the present invention; Figure 2 This is a schematic diagram of the second structure of the battery 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 a schematic diagram of the structure of the first electrode group, the second electrode group, and the third electrode group in one embodiment of the present invention; Figure 5 This is a cross-sectional view of the first pole group, the second pole group, and the third pole group in one embodiment of the present invention; Figure 6This is a front view of the third pole group in one embodiment of the present invention; Figure 7 This is a side view of the third pole group in one embodiment of the present invention; Figure 8 This is a top view of the first pole group, the second pole group, and the third pole group in one embodiment of the present invention; Figure 9 This is a side view of the second pole group in one embodiment of the present invention; Figure 10 This is a top view of the first pole group in one embodiment of the present invention.

[0019] In the picture: 1. First electrode group; 2. Second electrode group; 3. Third electrode group; 4. Conductive coating; 5. Electrode tab; 6. First assembly part; 61. Inclined surface; 7. Second assembly part; 71. Assembly groove; 8. Cover plate assembly; 81. Cover plate body; 811. Snap-fit ​​part; 82. Electrode post; 83. First connecting plate; 84. First plastic; 9. Housing; X, first direction; Y, second 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 7 This invention provides a battery comprising an electrode assembly, a plurality of tabs 5, a plurality of first assembly parts 6, a plurality of second assembly parts 7, a cover assembly 8, and a housing 9. The electrode assembly includes a first electrode assembly 1, two second electrode assemblies 2, and two third electrode assemblies 3. The first electrode assembly 1 extends along a first direction X, and the second electrode assemblies 2 and the third electrode assemblies 3 both extend along a second direction Y. The two second electrode assemblies 2 are respectively disposed at both ends of the first electrode assembly 1 in the first direction X, and the two third electrode assemblies 3 are respectively disposed on both sides of the first electrode assembly 1 in the second direction Y, with both third electrode assemblies 3 located between the two second electrode assemblies 2. The second electrode assemblies 2 and the third electrode assemblies 3 are electrically connected to the first electrode assembly 1 through a conductive coating 4. The plurality of tabs 5 are respectively disposed at both ends of the second electrode assemblies 2 and at one end of the third electrode assemblies 3 away from the first electrode assembly 1. The plurality of first assembly parts 6 are respectively disposed on the end faces of the second electrode assemblies 2 where the tabs 5 are disposed, and on the end faces of the third electrode assemblies 3 and 3. 3. The end face of the tab 5 is provided, and multiple second assembly parts 7 are respectively provided on the side of the first assembly part 6 away from the corresponding second pole group 2 and third pole group 3; the cover plate assembly 8 includes multiple cover plate bodies 81 and multiple pole posts 82. The multiple cover plate bodies 81 are respectively provided on the end face of the second pole group 2 where the tab 5 is provided and the end face of the third pole group 3 where the tab 5 is provided. At least one pole post 82 is provided on the cover plate body 81. The cover plate body 81 is provided with a snap-fit ​​part 811 at the position corresponding to the second assembly part 7 so that the cover plate body 81 snaps with the second assembly part 7. The snap-fit ​​part 811 protrudes from the pole post 82 and the pole post 82 is electrically connected to the tab 5; the housing 9 and the cover plate body 81 enclose a space for accommodating the first pole group 1, the second pole group 2, and the third pole group 3; the first direction X is the length direction of the first pole group 1, and the second direction Y is the length direction of the second pole group 2 and the third pole group 3.

[0025] In this embodiment, the side of the second electrode group 2 is connected to the end face of the first electrode group 1, and the end face of the third electrode group 3 is connected to the side of the first electrode group 1 to form a king-shaped electrode group structure. The first assembly part 6 is integrally formed with the first electrode group 1, the second electrode group 2, and the third electrode group 3 connected to it. The second assembly part 7 is integrally formed with the first assembly part 6 to improve the overall power of the battery. The end of the second electrode group 2 with the tab 5 and the end of the third electrode group 3 with the tab 5 are both provided with a first assembly part 6. The length of the side of the first assembly part 6 away from the second assembly part 7 is equal to the width of the corresponding second tab 5 or third tab 5. The shape of the cover plate body 81 is adapted to the shape of the first assembly part 6, and the shape of the snap-fit ​​part 811 is adapted to the shape of the second assembly part 7 so that the cover plate body 81 is snapped with the corresponding second electrode group 2 and third electrode group 3. The shell 9 and the cover plate body 81 are sealed and fixedly connected by welding.

[0026] Thus, the first assembly part 6 and the second assembly part 7 can improve the battery capacity and the structural strength of the ends of the second electrode group 2 and the third electrode group 3. The snap-fit ​​part 811 protrudes from the terminal post 82, which can improve the protection of the terminal post 82 and prevent the terminal post 82 from being bumped and damaged during transportation, assembly and other processes. The second electrode group 2 and the third electrode group 3 are connected to the first electrode group 1 through the conductive coating 4, which can save the arrangement of the connection structure, make full use of the space inside the housing 9, and enable the battery to adapt to the structural space of the car chassis, which is conducive to increasing the battery capacity. The separate design of the first electrode group 1, the second electrode group 2 and the third electrode group 3 can reduce the processing difficulty, improve the assembly efficiency and reduce the assembly difficulty. The cover plate body 81 is connected to the corresponding second electrode group 2 and the third electrode group 3, which can improve the connection stability between the cover plate assembly 8 and the second electrode group 2 and the third electrode group 3, prevent the second electrode group 2 and the third electrode group 3 from being damaged and shifted during the process of entering the housing, improve the stability of the first electrode group 1, the second electrode group 2 and the third electrode group 3 inside the housing 9, and thus improve the battery yield and safety.

[0027] It is understandable that the number and location of the second pole group 2 and the third pole group 3 can be adjusted according to actual needs, which will not be elaborated here.

[0028] See Figure 5 In some embodiments, the width of the first assembly portion 6 gradually decreases along the direction away from its corresponding connection to the second pole group 2 or the third pole group 3, and the width of the second assembly portion 7 on the side facing the first assembly portion 6 is greater than its width on the side away from the first assembly portion 6.

[0029] In this way, sufficient assembly space is provided on both sides of the first assembly part 6 and the second assembly part 7, avoiding assembly interference between the various structures, so as to facilitate the series and parallel connection between multiple batteries and the connection between the batteries and external circuits. It can also improve the assembly efficiency of the cover plate body 81, so that the cover plate body 81 is stably connected to the corresponding second electrode group 2 and third electrode group 3, thereby improving the structural strength of the battery.

[0030] It is understandable that the shapes of the first assembly part 6 and the second assembly part 7 can be adjusted according to actual needs. In this embodiment, the length of the first assembly part 6 facing the outside and the length of the second assembly part 7 facing the outside are both small, in order to facilitate the assembly of the cover plate body 81 and improve assembly efficiency.

[0031] Furthermore, in some embodiments, the cover plate assembly 8 further includes a first connecting plate 83 and a first plastic 84. The first connecting plate 83 is disposed on the side of the cover plate body 81 opposite to the second pole group 2 and the third pole group 3 to which it is connected. The first connecting plate 83 is electrically connected to the pole post 82. The first plastic 84 is disposed between the first connecting plate 83 and the cover plate body 81. The first connecting plate 83 and the pole post 82 are disposed in a one-to-one correspondence. The snap-fit ​​portion 811 protrudes from the first connecting plate 83.

[0032] See Figure 2 and Figure 6 In some embodiments, the first assembly part 6 is provided with two second assembly parts 7 at intervals on the side opposite to the second pole group 2 or the third pole group 3 to which it is connected. An assembly groove 71 is formed between the two assembly parts, the pole tab 5 is disposed in the assembly groove 71, and the pole post 82 is disposed at the position corresponding to the pole tab 5.

[0033] In this embodiment, two second assembly parts 7 are arranged at intervals along the width direction of the corresponding connected second pole group 2 or third pole group 3. The assembly groove 71 is a trapezoidal groove, and the length of the assembly part facing the first assembly part 6 is less than the length of the assembly part facing away from the first assembly part 6. Each assembly groove 71 is provided with a pole lug 5, and the pole post 82 provided in the corresponding assembly groove 71 is recessed in the snap-fit ​​part 811.

[0034] Thus, the second assembly part 7 can improve the protection of the pole post 82 and the first connecting plate 83, avoid the pole post 82 and the first connecting plate 83 from being bumped and damaged during transportation, assembly and other processes, and make full use of the space at the ends of the second pole group 2 and the third pole group 3 to improve the battery capacity and structural strength. The tabs 5 are set in the assembly groove 71 to improve the battery's overcurrent capacity and battery performance.

[0035] It is understandable that the number and location of the second assembly section 7 can be adjusted according to actual needs, and will not be elaborated here.

[0036] See Figure 2 and Figure 4 In some embodiments, the first assembly part 6 is provided with two inclined surfaces 61, which are located on both sides of the first assembly part 6 in the width direction of the second pole group 2 or the third pole group 3 to which it is connected. The pole tab 5 is provided on the inclined surface 61, and the pole post 82 is provided at the position corresponding to the pole tab 5.

[0037] In this embodiment, the first assembly part 6 is an isosceles trapezoidal structure, and two second assembly parts 7 are respectively disposed at both ends of the end face of the first assembly part 6. Each inclined surface 61 is provided with a tab 5.

[0038] Thus, the trapezoidal first assembly part 6 can guide the cover plate body 81 to engage with it, improving assembly efficiency and allowing sufficient assembly space on both sides of the inclined surface 61, increasing the number of electrode tabs 5 at the ends of the second electrode group 2 and the third electrode group 3, improving the battery's overcurrent capacity. Furthermore, the first assembly part 6 and the second assembly part 7 are stably connected to the cover plate body 81, which can prevent damage and movement of the second electrode group 2 and the third electrode group 3 during the process of entering the casing, and restrict the position of the second electrode group 2 and the third electrode group 3 within the casing 9.

[0039] It is understandable that the shape of the first assembly part 6 can also be triangular, rectangular, etc. The shape of the first assembly part 6 can be adjusted according to actual needs, and will not be listed in detail here.

[0040] See Figure 5 In some embodiments, the included angle between the two inclined surfaces 61 is N1, and satisfies 70°≤N1≤120°, and the included angle between the length direction of the third pole group 3 and the length direction of the first pole group 1 is N2, and satisfies 75°≤N2≤105°.

[0041] In this embodiment, the included angle N1 between the two inclined surfaces 61 can be any value between 70° and 120° or any range between any two values, such as 70°, 90°, 110°, 120°, etc.; the length direction of the second pole group 2 is parallel to the length direction of the third pole group 3, and the included angle N2 between the length direction of the third pole group 3 and the length direction of the first pole group 1 can be any value between 75° and 105° or any range between any two values, such as 75°, 85°, 90°, 95°, 105°, etc.

[0042] Thus, the first assembly part 6 and the second assembly part 7 can improve the battery capacity and the connection strength between the cover plate body 81 and the second electrode group 2 and the third electrode group 3, thereby improving the structural strength of the battery. The third electrode group 3 is set at an angle to the first electrode group 1, which can adapt to the structural space of the car chassis, improve the space utilization rate of the side of the first electrode group 1, and help to increase the battery capacity.

[0043] Understandably, the angle N1 between the two inclined surfaces 61 cannot be too small, as this would reduce the volume of the first assembly part 6 and hinder the increase of battery capacity. Conversely, the angle N1 between the two inclined surfaces 61 cannot be too large, as this would increase the battery size and affect space utilization. Similarly, the angle N2 between the length direction of the third electrode group 3 and the length direction of the first electrode group 1 cannot be too small, as this would increase the difficulty of processing and assembly.

[0044] See Figures 5 to 7 In some embodiments, two conductive coatings 4 are provided at intervals on the side surface of the second electrode group 2 and the end surface of the third electrode group 3, and conductive coatings 4 are provided on the side surface and end surface of the first electrode group 1 at positions corresponding to the second electrode group 2 and the third electrode group 3.

[0045] In this embodiment, the conductive coating 4 disposed at the connection between the end face of the first electrode group 1 and the second electrode group 2 extends along the width direction of the first electrode group 1, and the conductive coating 4 disposed at the connection between the side face of the first electrode group 1 and the third electrode group 3 extends along the length direction of the first electrode group 1. The two conductive coatings 4 disposed on the same plane have opposite polarities.

[0046] Thus, the two conductive coatings 4 are spaced apart, which can reduce the risk of short circuit, make full use of the internal space of the casing 9, improve space utilization and increase battery capacity. The second electrode group 2 and the third electrode group 3 are connected through the conductive coatings 4, which can facilitate processing and assembly, improve assembly efficiency and battery overcurrent capacity.

[0047] See Figure 7 and Figure 8 In some embodiments, the thickness of the first electrode group 1 is B, and satisfies 25mm≤B≤118mm, and the spacing between the two conductive coatings 4 disposed at the end of the first electrode group 1 is K, and satisfies 0.15≤K / B≤0.3.

[0048] In this embodiment, the thicknesses of the first electrode group 1, the second electrode group 2, and the third electrode group 3 are equal. The thickness B of the first electrode group 1 can be any value between 25mm and 118mm or any range between any two values, such as 25mm, 55mm, 85mm, 115mm, 118mm, etc. The ratio of the spacing K of the two conductive coatings 4 disposed at the end of the first electrode group 1 to the thickness B of the first electrode group 1 can be any value between 0.15 and 0.3 or any range between any two values, such as 0.15, 0.2, 0.25, 0.3, etc.

[0049] Thus, by providing a conductive coating 4 at the connection between the second electrode group 2 and the first electrode group 1, and at the connection between the third electrode group 3 and the first electrode group 1, the arrangement of the connection structure can be saved, the battery capacity can be increased, the overcurrent capacity of the second electrode group 2 and the third electrode group 3 can be increased, and the position of the first electrode group 1, the second electrode group 2, and the third electrode group within the casing 9 can be better restricted, so that the battery can be stably electrically connected to the external circuit, thereby improving the process yield and battery performance.

[0050] Understandably, the thickness B of the first electrode group 1 cannot be too small, as this would reduce the battery capacity. Conversely, the thickness B of the first electrode group 1 cannot be too large, as this would affect space utilization and make it difficult to assemble into the car chassis. The ratio of the distance K between the two conductive coatings 4 at the end of the first electrode group 1 to the thickness B of the first electrode group 1 cannot be too small, as this would increase the risk of short circuits. Similarly, the ratio of the distance K between the two conductive coatings 4 at the end of the first electrode group 1 to the thickness B of the first electrode group 1 cannot be too large, as this would reduce the area of ​​the conductive coatings 4 and affect the current carrying capacity.

[0051] See Figure 5 In some embodiments, along the second direction Y, the height of the first assembly part 6 is H, and satisfies 25mm≤H≤90mm, the surface distance between the two second assembly parts 7 disposed on the second pole group 2 is L, and the width of the second pole group 2 is A1, and satisfies 0.25≤L / A1≤0.6.

[0052] In this embodiment, the height H of the first assembly part 6 can be any value between 25mm and 90mm or any range between two values, such as 25mm, 30mm, 50mm, 70mm, 90mm, etc.; the ratio of the surface distance L between the two mutually distant second assembly parts 7 disposed on the second pole group 2 to the width A1 of the second pole group 2 can be any value between 0.25 and 0.6 or any range between two values, such as 0.25, 0.3, 0.4, 0.5, 0.6, etc.

[0053] Thus, the first assembly part 6 can increase the battery capacity and stably support the second assembly part 7. Together with the second assembly part 7, it can improve the protection of the terminal post 82 and the first connecting plate 83. The length of the first assembly part 6 facing the second assembly part 7 is smaller, which can reserve enough assembly space so that the terminal post 82 can be set on both sides of the first assembly part 6 and in the assembly groove 71, which can improve the overcurrent capacity, avoid the battery temperature from getting too high during fast charging, and facilitate the assembly of the cover plate assembly 8. This improves the connection stability between the cover plate assembly 8 and the second electrode group 2 and the third electrode group 3, avoids damage and movement of the second electrode group 2 and the third electrode group 3 during the process of entering the shell, and improves the stability of the first electrode group 1, the second electrode group 2, and the third electrode group 3 in the shell 9.

[0054] Understandably, the height H of the first assembly part 6 cannot be too small, as this would affect the battery capacity. Conversely, the height H of the first assembly part 6 cannot be too large, as this would increase the battery size and affect space utilization. The ratio of the surface distance L between the two distant surfaces of the two second assembly parts 7 located on the second electrode group 2 to the width A1 of the second electrode group 2 cannot be too small, as this would reduce the assembly space of the second assembly part 7. Similarly, the ratio of the surface distance L between the two distant surfaces of the two second assembly parts 7 located on the second electrode group 2 to the width A1 of the second electrode group 2 cannot be too large, as this would reduce the assembly space on both sides of the first assembly part 6.

[0055] See Figure 5 In some embodiments, the width of the first pole group 1 is A2, the width of the second pole group 2 is A1, and 0.6≤A2 / A1≤1 is satisfied. The distance between the third pole group 3 and the second pole groups 2 on both sides is equal. Along the first direction X, the distance between the third pole group 3 and the second pole group 2 is F. The sum of the length of the first pole group 1 and the width of the two second pole groups 2 is E2, and 0.33≤2*F / E2≤0.5 is satisfied.

[0056] In this embodiment, the ratio of the width A2 of the first pole group 1 to the width A1 of the second pole group 2 can be any value between 0.6 and 1, or any range between any two values, such as 0.6, 0.7, 0.8, 0.9, 1, etc.; the ratio of twice the distance F between the third pole group 3 and the second pole group 2 to the sum of the length of the first pole group 1 and the width of the two second pole groups 2, E2, can be any value between 0.33 and 0.5, or any range between any two values, such as 0.33, 0.35, 0.4, 0.45, 0.5, etc.

[0057] In this way, the first electrode group 1 has sufficient structural strength to support the second electrode group 2 and the third electrode group 3, avoiding deformation caused by local stress concentration. The third electrode group 3 is set at equal intervals with the second electrode groups 2 on both sides, which can make the battery more uniformly stressed, improve the structural strength of the battery, and provide sufficient assembly space between the second electrode group 2 and the third electrode group 3, which facilitates the assembly of the cover plate assembly 8 and the housing 9 and avoids assembly interference.

[0058] Understandably, the ratio of the width A2 of the first electrode group 1 to the width A1 of the second electrode group 2 cannot be too small. If it is too small, the structural strength of the first electrode group 1 will be insufficient, making it difficult to support the second electrode group 2 and the third electrode group 3. The ratio of the width A2 of the first electrode group 1 to the width A1 of the second electrode group 2 cannot be too large either, as this will increase the overall size of the battery. The ratio of twice the distance F between the third electrode group 3 and the second electrode group 2 to the sum of the length of the first electrode group 1 and the width of the two second electrode groups 2, E2, cannot be too small, as this will result in insufficient assembly space. The ratio of twice the distance F between the third electrode group 3 and the second electrode group 2 to the sum of the length of the first electrode group 1 and the width of the two second electrode groups 2, E2, cannot be too large either, as this will affect the battery capacity.

[0059] See Figures 5 to 10 In some embodiments, along the second direction Y, the length of the conductive coating 4 disposed on the second electrode group 2 is W1, the distance between the end faces of the second assembly parts 7 disposed at both ends of the second electrode group 2 is E1, and satisfies 0.1≤W1 / E1≤0.25; along the first direction X, the length of the conductive coating 4 at the connection between the first electrode group 1 and the third electrode group 3 is W2, and the width of the second electrode group 2 is A1, and satisfies 4mm≤W2-A1≤10mm.

[0060] In this embodiment, the ratio of the length W1 of the conductive coating 4 disposed on the second electrode group 2 to the distance E1 between the mutually distant end faces of the second assembly parts 7 disposed at both ends of the second electrode group 2 can be any value between 0.1 and 0.25 or any range between any two values, such as 0.1, 0.15, 0.2, 0.25, etc.; the difference between the length W2 of the conductive coating 4 at the connection between the first electrode group 1 and the third electrode group 3 and the width A1 of the second electrode group 2 can be any value between 4mm and 10mm or any range between any two values, such as 4mm, 5mm, 7mm, 9mm, 10mm, etc.

[0061] Thus, the conductive coating 4 has sufficient length to improve the battery's overcurrent capacity and assembly efficiency, which is conducive to the stable electrical connection between the second electrode group 2, the third electrode group 3 and the first electrode group 1, reduces the processing difficulty of the first electrode group 1, the second electrode group 2 and the third electrode group 3, and enables the battery to meet the fast charging requirements of high capacity and high rate.

[0062] Understandably, the ratio of the length W1 of the conductive coating 4 on the second electrode group 2 to the distance E1 between the far-away end faces of the second assembly parts 7 at both ends of the second electrode group 2 cannot be too small, as this would reduce the current carrying capacity. Conversely, the ratio of the length W1 of the conductive coating 4 on the second electrode group 2 to the distance E1 between the far-away end faces of the second assembly parts 7 at both ends of the second electrode group 2 cannot be too large, as this would increase the processing difficulty. The difference between the length W2 of the conductive coating 4 at the connection between the first electrode group 1 and the third electrode group 3 and the width A1 of the second electrode group 2 cannot be too small, as this would increase the risk of stress concentration. Similarly, the difference between the length W2 of the conductive coating 4 at the connection between the first electrode group 1 and the third electrode group 3 and the width A1 of the second electrode group 2 cannot be too large, as this would affect the increase in battery capacity.

[0063] To verify the rationality of the following parameters: the height H of the first assembly part 6, the ratio of the surface distance L between the two distant second assembly parts 7 of the second electrode group 2 to the width A1 of the second electrode group 2, the ratio of the width A2 of the first electrode group 1 to the width A1 of the second electrode group 2, the ratio of twice the distance F between the third electrode group 3 and the second electrode group 2 to the sum of the length of the first electrode group 1 and the width E2 of the two second electrode groups 2, the ratio of the length W1 of the conductive coating 4 of the second electrode group 2 to the distance E1 between the distant end faces of the second assembly parts 7 at both ends of the second electrode group 2, the ratio of the distance K between the two conductive coatings 4 at the end of the first electrode group 1 to the thickness B of the first electrode group 1, the difference between the length W2 of the conductive coating 4 at the connection between the first electrode group 1 and the third electrode group 3 and the width A1 of the second electrode group 2, the included angle N1 of the two inclined surfaces 61, the included angle N2 between the length direction of the third electrode group 3 and the length direction of the first electrode group 1, and the range of the thickness B of the first electrode group 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0064] Table 1 As can be seen from Examples 1 to 6 in Table 1, after the range limitation is met, the battery qualification rate meets the requirements. The structural strength of the first electrode group 1, the second electrode group 2, and the third electrode group 3 and the fit between the shell 9 and the cover plate assembly 8 are all normal. The battery temperature and the overcurrent capacity of the tab 5 meet the design requirements.

[0065] As can be seen from Comparative Example 1, when the ratio of the surface distance L between the two second assembly parts 7 located in the second electrode group 2 to the width A1 of the second electrode group 2 is too small, the battery qualification rate does not meet the requirements, the proportion of the first assembly part 6 is insufficient, reducing the increase in battery capacity, and the support strength of the first assembly part 6 is too weak.

[0066] As can be seen from Comparative Example 2, when the ratio of the surface distance L between the two second assembly parts 7 located far apart from each other in the second electrode group 2 to the width A1 of the second electrode group 2 is too large, the battery qualification rate does not meet the requirements. The proportion of the first assembly part 6 is too large, reducing the space on both sides of the first assembly part 6 and affecting the current carrying capacity of the tab 5 and the cover plate assembly 8.

[0067] As can be seen from Comparative Example 3, when the ratio of twice the distance F between the third electrode group 3 and the second electrode group 2 to the sum of the length of the first electrode group 1 and the width of the two second electrode groups 2, E2, is too small, the battery qualification rate does not meet the requirements. The distance between the second electrode group 2 and the third electrode group 3 is insufficient, which limits the total length of the battery and reduces the battery size compatibility range.

[0068] As shown in Comparative Example 4, when the ratio of twice the distance F between the third electrode group 3 and the second electrode group 2 to the sum of the length of the first electrode group 1 and the width of the two second electrode groups 2, E2, is too large, the battery qualification rate does not meet the requirements. The distance between the second electrode group 2 and the third electrode group 3 is too large, which encroaches on the width of the second electrode group 2 and the third electrode group 3, reduces the size of the battery, and affects the battery capacity and overcurrent capability.

[0069] As can be seen from Comparative Example 5, when the ratio of the distance K between the two conductive coatings 4 at the end of the first electrode group 1 to the thickness B of the first electrode group 1 is too small, the battery qualification rate does not meet the requirements. The distance between the conductive coatings 4 is insufficient, resulting in insufficient insulation distance between the positive and negative electrode sheets and increasing the risk of short circuit.

[0070] As can be seen from Comparative Example 6, when the ratio of the distance K between the two conductive coatings 4 at the end of the first electrode group 1 to the thickness B of the first electrode group 1 is too large, the battery qualification rate does not meet the requirements. The distance between the conductive coatings 4 is too large, and the contact area of ​​the conductive coatings 4 is insufficient, which affects the battery's overcurrent capacity and stability.

[0071] 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: The electrode group includes a first electrode group (1), two second electrode groups (2) and two third electrode groups (3). The first electrode group (1) extends along a first direction (X), and the second electrode groups (2) and the third electrode groups (3) both extend along a second direction (Y). The two second electrode groups (2) are respectively disposed at both ends of the first electrode group (1) in the first direction (X), and the two third electrode groups (3) are respectively disposed on both sides of the first electrode group (1) in the second direction (Y). The two third electrode groups (3) are both located between the two second electrode groups (2). The second electrode groups (2) and the third electrode groups (3) are both electrically connected to the first electrode group (1) through a conductive coating (4). Multiple electrodes (5) are respectively disposed at both ends of the second electrode group (2) and at one end of the third electrode group (3) away from the first electrode group (1); Multiple first assembly parts (6) and multiple second assembly parts (7), the multiple first assembly parts (6) are respectively disposed on the end face of the second pole group (2) where the pole tab (5) is disposed, and on the end face of the third pole group (3) where the pole tab (5) is disposed, the multiple second assembly parts (7) are respectively disposed on the side of the first assembly part (6) away from its corresponding second pole group (2) and third pole group (3); The cover plate assembly (8) includes multiple cover plate bodies (81) and multiple pole posts (82). The multiple cover plate bodies (81) are respectively disposed on the end face of the second pole group (2) where the pole tab (5) is disposed, and on the end face of the third pole group (3) where the pole tab (5) is disposed. The cover plate bodies (81) are snapped into the second assembly part (7), and the pole posts (82) are electrically connected to the pole tab (5). The housing (9) and the cover plate body (81) enclose a space for accommodating the first pole group (1), the second pole group (2), and the third pole group (3); The first direction (X) is the length direction of the first pole group (1), and the second direction (Y) is the length direction of the second pole group (2) and the third pole group (3).

2. The battery according to claim 1, characterized in that, Along the direction away from the second pole group (2) or the third pole group (3) to which it is connected, the width of the first assembly part (6) gradually decreases; and / or, the width of the second assembly part (7) on the side facing the first assembly part (6) is greater than its width on the side away from the first assembly part (6).

3. The battery according to claim 1, characterized in that, The first assembly part (6) is provided with two second assembly parts (7) on the side opposite to the second pole group (2) or the third pole group (3) connected to it, and an assembly groove (71) is formed between the two assembly parts. The electrode tab (5) is disposed in the assembly groove (71), and the pole post (82) is disposed at the position corresponding to the electrode tab (5).

4. The battery according to claim 1, characterized in that, The first assembly part (6) is provided with two inclined surfaces (61). The two inclined surfaces (61) are provided on both sides of the first assembly part (6) in the width direction of the second pole group (2) or the third pole group (3) to which it is connected. The pole tab (5) is provided on the inclined surface (61), and the pole post (82) is provided at the position corresponding to the pole tab (5).

5. The battery according to claim 4, characterized in that, The angle between the two inclined surfaces (61) is N1, and satisfies 70°≤N1≤120°; and / or, the angle between the length direction of the third pole group (3) and the length direction of the first pole group (1) is N2, and satisfies 75°≤N2≤105°.

6. The battery according to claim 1, characterized in that, The side of the second electrode group (2) and the end face of the third electrode group (3) are each provided with two conductive coatings (4) at intervals. The side and end faces of the first electrode group (1) are provided with conductive coatings (4) at positions corresponding to the second electrode group (2) and the third electrode group (3).

7. The battery according to claim 6, characterized in that, The thickness of the first electrode group (1) is B, and satisfies 25mm≤B≤118mm; and / or, the distance between the two conductive coatings (4) disposed at the end of the first electrode group (1) is K, and satisfies 0.15≤K / B≤0.

3.

8. The battery according to claim 3, characterized in that, Along the second direction (Y), the height of the first assembly part (6) is H, and satisfies 25mm≤H≤90mm; and / or, the surface distance between the two second assembly parts (7) disposed in the second pole group (2) that are far apart from each other is L, and the width of the second pole group (2) is A1, and satisfies 0.25≤L / A1≤0.

6.

9. The battery according to any one of claims 1-8, characterized in that, The width of the first pole group (1) is A2, the width of the second pole group (2) is A1, and 0.6≤A2 / A1≤1 is satisfied; and / or, the distance between the third pole group (3) and the second pole groups (2) on both sides is equal, and along the first direction (X), the distance between the third pole group (3) and the second pole group (2) is F, the sum of the length of the first pole group (1) and the width of the two second pole groups (2) is E2, and 0.33≤2*F / E2≤0.5 is satisfied.

10. The battery according to any one of claims 1-8, characterized in that, Along the second direction (Y), the length of the conductive coating (4) disposed on the second electrode group (2) is W1, the distance between the end faces of the second assembly parts (7) disposed at both ends of the second electrode group (2) is E1, and satisfies 0.1≤W1 / E1≤0.25; and / or, along the first direction (X), the length of the conductive coating (4) at the connection between the first electrode group (1) and the third electrode group (3) is W2, the width of the second electrode group (2) is A1, and satisfies 4mm≤W2-A1≤10mm.

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