A battery

Abstract

The application belongs to the technical field of batteries, and discloses a battery, which comprises a first pole group, two second pole groups, a cover plate assembly and a shell, the first pole group is provided with heat dissipation holes extending along a first direction, the two second pole groups are respectively arranged on the two sides of the first pole group in a second direction, the two second pole groups are electrically connected with the first pole group, the end of the second pole group away from the first pole group is provided with a pole lug, and the end of the second pole group provided with the pole lug is provided with an assembling part; the cover plate assembly comprises a cover plate body and a pole column, the cover plate body is provided with two, the two cover plate bodies are respectively arranged at one end of the second pole group provided with the pole lug, the cover plate body is provided with a clamping part at the position corresponding to the assembling part, and the clamping part protrudes from the pole column along the second direction; the shell and the cover plate body enclose a space for accommodating the first pole group and the second pole group, and the shell is provided with a first opening and a second opening. In this way, the protection effect of the pole column can be improved, and the space utilization and the structural strength of the battery can be improved.

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 rivets usually protrude from the flat cover, occupying a lot of external space during battery module assembly, affecting the assembly rate. Furthermore, the terminals and rivets have poor protective effect, making them prone to bumps and damage during transportation and assembly processes, affecting battery yield and safety. The thin casing is also prone to deformation under external force, leading to damage to the battery assembly. The battery has low space utilization, making it difficult to fit into the assembly space of the car chassis. The increase in battery capacity is limited, making it difficult to meet the demand for high-capacity, high-rate fast charging. Summary of the Invention

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

[0006] To achieve this objective, the present invention adopts the following technical solution: A battery includes: a first electrode group and two second electrode groups. The first electrode group has heat dissipation holes extending in a first direction. The two second electrode groups are respectively disposed on both sides of the first electrode group in a second direction. Both second electrode groups are electrically connected to the first electrode group. Each second electrode group has a tab at its end opposite to the first electrode group, and an assembly portion at the end of the second electrode group where the tab is located. A cover plate assembly includes a cover plate body and two terminal posts. Two cover plate bodies are respectively disposed at the ends of the second electrode groups where the tabs are located. The terminal posts are disposed on the cover plate bodies. The cover plate body is electrically connected to the electrode tab, and a snap-fit ​​portion is provided at the position corresponding to the assembly portion, so that the snap-fit ​​portion is snapped into the assembly portion. Along the second direction, the snap-fit ​​portion protrudes from the electrode post. The housing and the cover plate body enclose a space for accommodating the first electrode group and the second electrode group. The housing has a first opening and a second opening, so that the first electrode group and the second electrode group are respectively inserted into the housing. The first direction is the length direction of the cover plate body, and the second direction is the thickness direction of the cover plate body. The first direction is perpendicular to the second direction.

[0007] Preferably, the second electrode group has two assembly parts at the end of the electrode tab, the two assembly parts are spaced apart along the first direction, and an assembly groove is formed between the two assembly parts. The electrode tab is disposed in the assembly groove, and the electrode post is disposed on the bottom wall corresponding to the assembly groove.

[0008] Preferably, the housing is provided with a cooling channel at the position corresponding to the heat dissipation hole, and the cooling channel is disposed in close contact with the inner wall of the heat dissipation hole.

[0009] Preferably, the first electrode group has a circular structure, and the heat dissipation hole is concentrically arranged with the first electrode group. The heat dissipation hole is a through hole extending along the first direction.

[0010] Preferably, the housing includes a first part, a second part, and a connecting part. The first electrode group is disposed inside the first part, the second electrode group is disposed inside the second part, and the connecting part is disposed at one end of the second part facing the cover plate body. The connecting part is engaged with the cover plate body.

[0011] Preferably, a plug is connected to the position where the first opening is made in the first part, and the plug is fixedly connected to the housing.

[0012] Preferably, the wall thickness of the second part is T1, and satisfies 0.3mm≤T1≤1.5mm; and / or, the wall thickness of the plug is T2, and satisfies 0.5mm≤T2≤2mm.

[0013] Preferably, along the second direction, the height of the connecting portion is H, and satisfies 10mm≤H≤80mm; and / or, along the first direction, the length of the connecting portion is L1, the width of the second portion is A, and satisfies 0.55≤L1 / A≤0.8.

[0014] Preferably, the housing is provided with a cooling channel corresponding to the position of the heat dissipation hole, the diameter of the cooling channel is F, the diameter of the first part is D, and the condition 0.2≤F / D≤0.35 is satisfied; and / or, along the third direction, the width of the second part is B, and the condition 20mm≤DB≤100mm is satisfied.

[0015] Preferably, the total length of the housing along the second direction is E, and satisfies 350mm≤E≤900mm.

[0016] The beneficial effects of this invention are: A battery includes a first electrode group, two second electrode groups, a cover assembly, and a housing. The first electrode group has heat dissipation holes extending along a first direction. The two second electrode groups are respectively disposed on both sides of the first electrode group in a second direction and are electrically connected to the first electrode group. Each second electrode group has a tab at its end facing away from the first electrode group, and an assembly portion is provided at the end of the second electrode group with the tab. The cover assembly includes a cover body and two terminals. Two cover bodies are provided, each disposed at one end of the second electrode group with the tab. The terminals are disposed on the cover body and electrically connected to the tab. The cover body has a snap-fit ​​portion at the position corresponding to the assembly portion, so that the snap-fit ​​portion snaps into the assembly portion. Along the second direction, the snap-fit ​​portion protrudes from the terminal. The housing and the cover body enclose a space for accommodating the first electrode group and the second electrode group. The housing has a first opening and a second opening, so that the first electrode group and the second electrode group are respectively inserted into the housing. The first direction is the length direction of the cover body, and the second direction is the thickness direction of the cover body. The first direction is perpendicular to the second direction.

[0017] In this way, the first and second electrode groups are connected by a conductive coating, which saves on the layout of the connection structure, makes full use of the space inside the casing, and increases the battery capacity. The heat dissipation holes on the first electrode group can increase the heat exchange area of ​​the first electrode group and prevent heat from accumulating inside the casing. The symmetrical arrangement of the second electrode group can improve the overall structural strength of the battery, make the battery more evenly stressed, and avoid stress concentration. The assembly part can increase the battery capacity, adapt it to the structural space of the car chassis, improve space utilization, and also protect the recessed terminals from bumps and damage during transportation, assembly and other processes, thereby improving the battery yield and safety. Attached Figure Description

[0018] Figure 1This 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 structure of the first pole group and the second pole group in one embodiment of the present invention; Figure 4 This is an exploded view of the first and second pole groups in one embodiment of the present invention; Figure 5 This is a schematic diagram of the cover plate assembly in one embodiment of the present invention; Figure 6 This is a schematic diagram of the shell structure in one embodiment of the present invention; Figure 7 This is an exploded view of the housing in one embodiment of the present invention; Figure 8 This is a cross-sectional view of the housing in one embodiment of the present invention; Figure 9 This is a side view of the housing in one embodiment of the present invention; Figure 10 This is a bottom view of one embodiment of the present invention.

[0019] In the picture: 1. First electrode group; 11. Heat dissipation hole; 12. Conductive coating; 2. Second electrode group; 21. Electrode tab; 22. Assembly part; 23. Assembly slot; 3. Cover plate assembly; 31. Cover plate body; 311. Snap-fit ​​part; 32. Electrode post; 33. First connecting plate; 34. First plastic; 4. Housing; 41. First opening; 42. Second opening; 43. Cooling channel; 44. First part; 45. Second part; 46. Connecting part; 47. Plug; 5. Explosion-proof valve; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] See Figures 1 to 5 This invention provides a battery comprising a first electrode group 1, two second electrode groups 2, a cover assembly 3, and a housing 4. The first electrode group 1 has heat dissipation holes 11 extending along a first direction X. The two second electrode groups 2 are respectively disposed on both sides of the first electrode group 1 in a second direction Y, and both second electrode groups 2 are electrically connected to the first electrode group 1. The ends of the second electrode groups 2 opposite to the first electrode group 1 are provided with tabs 21, and the ends of the second electrode groups 2 with tabs 21 are provided with mounting portions 22. The cover assembly 3 includes a cover body 31 and two terminals 32. Two cover bodies 31 are provided, and the two cover bodies 31 are respectively disposed at the ends of the second electrode groups 2 with tabs 21. 2. A locking part 311 is provided on the cover plate body 31 and electrically connected to the electrode tab 21. The cover plate body 31 is provided with a locking part 311 at the position corresponding to the assembly part 22 so that the locking part 311 is locked with the assembly part 22. The locking part 311 protrudes from the electrode post 32 along the second direction Y. The housing 4 and the cover plate body 31 enclose a space for accommodating the first electrode group 1 and the second electrode group 2. The housing 4 has a first opening 41 and a second opening 42 so that the first electrode group 1 and the second electrode group 2 are respectively inserted into the housing 4. The first direction X is the length direction of the cover plate body 31, and the second direction Y is the thickness direction of the cover plate body 31. The first direction X is perpendicular to the second direction Y.

[0025] In this embodiment, heat dissipation holes 11 are opened in the middle of the first electrode group 1. The two second electrode groups 2 are connected to the first electrode group 1 through conductive coating 12, and the two second electrode groups 2 are symmetrically arranged on both sides of the first electrode group 1. The assembly part 22 is integrally formed with the second electrode group 2 to improve the overall capacity of the battery. The cover plate body 31 is fitted to the end of the second electrode group 2 where the tab 21 is provided. A pole post 32 is provided on the cover plate body 31. The shell 4 and the cover plate body 31 are sealed and fixedly connected by welding. The cover plate assembly 3 also includes a first connecting plate 33 and a first plastic 34. The first connecting plate 33 is disposed on the side of the cover plate body 31 away from the second electrode group 2, and the first plastic 34 is disposed between the first connecting plate 33 and the cover plate body 31.

[0026] Thus, the first electrode group 1 and the second electrode group 2 are connected by the conductive coating 12, which can save on the arrangement of the connection structure, make full use of the space inside the housing 4, and increase the battery capacity. The heat dissipation holes 11 on the first electrode group 1 can increase the heat exchange area of ​​the first electrode group 1 and avoid heat accumulation inside the housing 4. The second electrode group 2 is symmetrically arranged, which can improve the overall structural strength of the battery, make the battery more uniformly stressed, and avoid stress concentration. The assembly part 22 can increase the battery capacity, adapt it to the structural space of the car chassis, improve space utilization, and also protect the recessed terminal post 32 to prevent the terminal post 32 from being bumped and damaged during transportation, assembly and other processes, thereby improving the battery yield and safety.

[0027] It is understandable that the number and location of poles 32 can be adjusted according to actual needs, which will not be elaborated here.

[0028] See Figure 4 In some embodiments, the second electrode group 2 has two assembly parts 22 at the end of the electrode tab 21. The two assembly parts 22 are spaced apart along the first direction X, and an assembly groove 23 is formed between the two assembly parts 22. The electrode tab 21 is disposed in the assembly groove 23, and the electrode post 32 is disposed on the bottom wall of the assembly groove 23.

[0029] In this embodiment, the two assembly parts 22 are symmetrically arranged along the axis of symmetry of the second pole group 2 in the second direction Y, the assembly groove 23 extends along the first direction X, and correspondingly, the pole tab 21 extends along the first direction X, and the pole post 32 is disposed in the assembly groove 23.

[0030] In this way, the assembly part 22 can improve the battery capacity and fast charging performance, while improving the protection effect on the terminal post 32 and the tab 21, improving the connection strength between the cover plate assembly 3 and the second electrode group 2, avoiding damage and movement of the second electrode group 2 during the casing process, and providing sufficient assembly space between the two assembly parts 22, making full use of the end space of the second electrode group 2, improving space utilization, and increasing the battery module assembly rate.

[0031] It is understood that the assembly part 22 may also be provided in three, four, etc., and the tabs 21 are provided between adjacent assembly parts 22. In this embodiment, there are two assembly parts 22, so that the assembly groove 23 has sufficient length to provide the tabs 21 and improve the current carrying capacity of the battery. The number and setting position of the assembly parts 22 can be adjusted according to actual needs, and will not be listed in detail here.

[0032] See Figures 4 to 7 In some embodiments, the housing 4 is provided with a cooling channel 43 at the position corresponding to the heat dissipation hole 11, and the cooling channel 43 is disposed in close contact with the inner wall of the heat dissipation hole 11.

[0033] In this embodiment, the cooling channel 43 is fixedly connected to the housing 4, and during assembly, the first pole group 1 is inserted into the cooling channel 43.

[0034] Thus, the cooling channel 43 is fitted to the first electrode group 1, which can quickly dissipate the heat generated by the first electrode group 1, cool the battery, improve the heat dissipation efficiency of the battery, and thus improve the safety of the battery. In addition, the cooling channel 43 can limit the relative position of the first electrode group 1 in the housing 4, which facilitates the assembly of the first electrode group 1, improves the stability and assembly efficiency of the first electrode group 1 in the housing 4, and prevents the first electrode group 1 from moving around in the housing 4.

[0035] See Figure 4 In some embodiments, the first electrode group 1 is a circular structure, and the heat dissipation hole 11 is concentrically arranged with the first electrode group 1. The heat dissipation hole 11 is a through hole extending along the first direction X.

[0036] In this embodiment, the first electrode group 1 extends along the first direction X, and the heat dissipation hole 11 is disposed through the first electrode group 1. The thickness of the first electrode group 1 is greater than the thickness of the second electrode group 2. The conductive coating 12 is disposed on the outer peripheral surface of the first electrode group 1 and the end surface of the second electrode group 2 respectively. The shape of the housing 4 is adapted to the shape of the first electrode group 1 and the shape of the second electrode group 2.

[0037] Thus, the first electrode group 1 with a circular structure can adapt to the structural space of the car chassis and improve the battery capacity and structural strength. It avoids deformation and damage to the battery due to insufficient structural strength at the connection between the first electrode group 1 and the second electrode group 2. The casing 4 can provide stable protection for the first electrode group 1 and the second electrode group 2. The first electrode group 1 and the second electrode group 2 are connected by a conductive coating 12, which can reduce the assembly difficulty and make the first electrode group 1 and the second electrode group 2 continuously electrically connected. The conductive coating 12 is set on both sides of the outer peripheral surface of the first electrode group 1, which can reduce the risk of short circuit and improve the battery yield and safety.

[0038] It is understandable that the first pole group 1 can also be a square structure with heat dissipation holes 11 in the middle. The shape of the first pole group 1 can be adjusted according to actual needs, which will not be elaborated here.

[0039] See Figures 5 to 7 In some embodiments, the housing 4 includes a first part 44, a second part 45 and a connecting part 46. The first pole group 1 is disposed inside the first part 44, the second pole group 2 is disposed inside the second part 45, and the connecting part 46 is disposed at one end of the second part 45 facing the cover plate body 31. The connecting part 46 is snapped into the cover plate body 31.

[0040] In this embodiment, the two ends of the second part 45 are integrally formed with the first part 44 and the connecting part 46, respectively. The shape of the first electrode group 1 is the same as the shape of the first part 44, and the shape of the second electrode group 2 is the same as the shape of the second part 45. The connecting part 46 is positioned corresponding to the mounting groove 23. Along the first direction X, the length of the connecting part 46 is less than the width of the second part 45. The battery also includes an explosion-proof valve 5, which is disposed on the surface of the first part 44 in the first direction X.

[0041] This facilitates the assembly of the first electrode group 1 and the second electrode group 2, improves assembly efficiency, and restricts the position of the first electrode group 1 and the second electrode group 2 within the housing 4, preventing damage and movement of the first electrode group 1 and the second electrode group 2 during assembly. The connecting part 46 is snapped into the cover plate body 31, enabling rapid positioning of the cover plate body 31 and improving the connection strength between the cover plate body 31 and the connecting part 46. The explosion-proof valve 5 is placed on the side of the first part 44, which can make full use of the space of the first part 44 in the first direction X. When the battery experiences thermal runaway, the large amount of gas generated can be quickly discharged to the outside through the explosion-proof valve 5, improving the safety of the battery.

[0042] It is understood that the number and location of the explosion-proof valves 5 can be adjusted according to actual needs. In this embodiment, the explosion-proof valves 5 are symmetrically arranged on both sides of the first part 44 along the first direction X.

[0043] See Figure 7 In some embodiments, a plug 47 is connected to the position where the first opening 41 is opened in the first part 44, and the plug 47 is fixedly connected to the housing 4.

[0044] In this embodiment, the shape of the plug 47 is the same as the end face shape of the first pole group 1 in the first direction X. The plug 47, the housing 4, and the cooling channel 43 are all sealed and fixedly connected by welding. The thickness of the plug 47 is greater than the thickness of the housing 4.

[0045] Thus, inserting the first electrode group 1 into the first part 44 can restrict the position of the first electrode group 1 within the first part 44. The plug 47 can protect the end of the first electrode group 1. The plug 47, the housing 4, and the cover plate body 31 can form a space to protect the first electrode group 1 and the second electrode group 2, thereby improving the structural strength of the battery. The plug 47 is thicker than the housing 4, which can improve the structural strength at the connection between the plug 47 and the housing 4, prevent the plug 47 from deforming or breaking during the welding process, and improve the yield and safety of the battery.

[0046] See Figure 8 In some embodiments, the wall thickness of the second part 45 is T1, and satisfies 0.3mm≤T1≤1.5mm, and the wall thickness of the plug 47 is T2, and satisfies 0.5mm≤T2≤2mm.

[0047] In this embodiment, the wall thickness of the second part 45 is the same as that of the first part 44. The wall thickness T1 of the second part 45 can be any value between 0.3mm and 1.5mm or any range between any two values, such as 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.5mm, etc.; the wall thickness T2 of the plug 47 can be any value between 0.5mm and 2mm or any range between any two values, such as 0.5mm, 1mm, 1.5mm, 2mm, etc.

[0048] Thus, the thicker end cap 47 can be stably connected to the housing 4 and improve the protection of the first electrode group 1 and the second electrode group 2, preventing the housing 4 from deforming under external forces. It can also improve the structural strength of the connection between the end cap 47 and the cooling channel 43, preventing the cooling channel 43 from deforming during welding and affecting the heat dissipation effect. The heat generated by the first electrode group 1 can be transferred to the cooling channel 43, allowing the cooling channel 43 to fully exchange heat with the air, thereby cooling the first electrode group 1, improving battery safety, and making full use of the internal space of the first electrode group 1 to improve space utilization.

[0049] Understandably, the wall thickness T1 of the second part 45 cannot be too small, as this would reduce the structural strength of the casing 4 and increase the risk of deformation under stress. The wall thickness T1 of the second part 45 cannot be too large either, as this would increase the overall size of the battery and affect space utilization. The wall thickness T2 of the plug 47 cannot be too small, as this would make it easy to deform when welding with the first part 44. The wall thickness T2 of the plug 47 cannot be too large either, as this would increase the longitudinal dimension of the battery.

[0050] See Figure 8 In some embodiments, the height of the connecting portion 46 along the second direction Y is H, and satisfies 10mm≤H≤80mm; the length of the connecting portion 46 along the first direction X is L1; and the width of the second portion 45 is A, and satisfies 0.55≤L1 / A≤0.8.

[0051] In this embodiment, the height H of the connecting part 46 can be any value between 10mm and 80mm or any range between two values, such as 10mm, 20mm, 40mm, 60mm, 80mm, etc.; the ratio of the length L1 of the connecting part 46 to the width A of the second part 45 can be any value between 0.55 and 0.8 or any range between two values, such as 0.55, 0.6, 0.7, 0.8, etc.

[0052] In this way, the connecting part 46 can have sufficient height, which improves the connection strength between the cover plate body 31 and the connecting part 46, improves the structural strength at the assembly groove 23, and facilitates the quick positioning of the cover plate body 31 to the second part 45, improving assembly efficiency. This allows the pole post 32 and the first connecting plate 33 to be stably set in the assembly groove 23, improving the protection effect on the pole post 32 and the first connecting plate 33, and preventing the pole post 32 and the first connecting plate 33 from being bumped and damaged during transportation, assembly and other processes.

[0053] Understandably, the height H of the connecting part 46 cannot be too small, as this would reduce the connection strength between the connecting part 46 and the cover plate body 31. The height H of the connecting part 46 cannot be too large either, as this would increase the size of the battery and affect the space utilization rate. The ratio of the length L1 of the connecting part 46 to the width A of the second part 45 cannot be too small, as this would result in a smaller length of the assembly groove 23, reduce the length of the tab 21, and affect the current carrying capacity of the battery.

[0054] See Figure 9 and Figure 10 In some embodiments, the diameter of the cooling channel 43 is F, the diameter of the first part 44 is D, and the condition 0.2≤F / D≤0.35 is satisfied. Along the third direction Z, the width of the second part 45 is B, and the condition 20mm≤DB≤100mm is satisfied.

[0055] In this embodiment, the ratio of the diameter F of the cooling channel 43 to the diameter D of the first part 44 can be any value between 0.2 and 0.35 or any range between any two values, such as 0.2, 0.25, 0.3, 0.35, etc.; the difference between the diameter D of the first part 44 and the width B of the second part 45 can be any value between 20mm and 100mm or any range between any two values, such as 20mm, 40mm, 60mm, 80mm, 100mm, etc.

[0056] In this way, the cooling channel 43 has sufficient heat dissipation space, which facilitates the rapid transfer of heat generated by the first electrode group 1 to the outside, thereby improving the heat dissipation efficiency of the battery. The diameter of the second part 45 is larger than the width of the first part 44, which can increase the overall capacity of the battery and make the first electrode group 1 and the second electrode group 2 stably connected. Sufficient assembly space can be reserved on both sides of the first part 44 to facilitate the assembly of the cover plate assembly 3 and the connection of multiple batteries in series and parallel.

[0057] Understandably, the ratio of the diameter F of the cooling channel 43 to the diameter D of the first part 44 cannot be too small. If it is too small, the heat dissipation area of ​​the cooling channel 43 will be reduced, which is not conducive to cooling the first electrode group 1. The ratio of the diameter F of the cooling channel 43 to the diameter D of the first part 44 cannot be too large either. If it is too large, it will reduce the volume of the first electrode group 1 and reduce the battery capacity. The difference between the diameter D of the first part 44 and the width B of the second part 45 cannot be too small. If it is too small, it will affect the increase in battery capacity. The difference between the diameter D of the first part 44 and the width B of the second part 45 cannot be too large either. If it is too large, it will lead to an excessive difference in thickness between the first electrode group 1 and the second electrode group 2, which will affect the uniformity of the force on the battery.

[0058] See Figure 10 In some embodiments, the total length of the housing 4 along the second direction Y is E, and satisfies 350mm≤E≤900mm.

[0059] In this embodiment, the total length E of the housing 4 can be any value between 350mm and 900mm or any range between two values, such as 350mm, 400mm, 600mm, 800mm, 900mm, etc.

[0060] In this way, the housing 4 can cover the first electrode group 1 and the second electrode group 2, restrict the position of the first electrode group 1 and the second electrode group 2 inside the housing 4, and improve the structural strength of the connection between the second part 45 of the housing 4 and the cover plate body 31, so that the snap-fit ​​part 311 can provide protection for the electrode post 32 and the first connecting plate 33, avoid the electrode post 32 and the first connecting plate 33 from being bumped and damaged during transportation, assembly and other processes, and improve the battery yield and safety.

[0061] Understandably, the total length E of the casing 4 cannot be too small, as this would reduce the battery size and hinder the improvement of battery capacity. Conversely, the total length E of the casing 4 cannot be too large, as this would reduce space utilization.

[0062] To verify the rationality of the following ranges: the height H of the connecting part 46, the ratio of the length L1 of the connecting part 46 to the width A of the second part 45, the ratio of the diameter F of the cooling channel 43 to the diameter D of the first part 44, the difference between the diameter D of the first part 44 and the width B of the second part 45, the wall thickness T1 of the second part 45, the wall thickness T2 of the plug 47, and the total length E of the housing 4, as shown in Table 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0063] 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 casing 4 and the fit between the casing 4 and the first electrode group 1, the second electrode group 2, and the cover plate assembly 3 are all normal. The casing 4 and the plug 47 are undamaged. The battery overcurrent capacity, capacity, and valve opening time all meet the design requirements.

[0064] As can be seen from Comparative Example 1, when the ratio of the length L1 of the connecting part 46 to the width A of the second part 45 is too small, the battery qualification rate does not meet the requirements. The length of the connecting part 46 is insufficient, which reduces the increase in battery capacity and increases the difficulty and cost of stamping the cover body 31.

[0065] As can be seen from Comparative Example 2, when the ratio of the length L1 of the connecting part 46 to the width A of the second part 45 is too large, the battery qualification rate does not meet the requirements. The length of the connecting part 46 is too large, which reduces the structural strength of the cover body 31, the current carrying capacity of the tab 21, and the space utilization rate.

[0066] As can be seen from Comparative Example 3, when the ratio of the diameter F of the cooling channel 43 to the diameter D of the first part 44 is too small, the battery qualification rate does not meet the requirements. The proportion of the aperture size of the cooling channel 43 is insufficient, which increases the difficulty of forming the shell 4 and reduces the cooling effect in the middle of the battery.

[0067] As can be seen from Comparative Example 4, when the ratio of the diameter F of the cooling channel 43 to the diameter D of the first part 44 is too large, the battery qualification rate does not meet the requirements. The proportion of the aperture size of the cooling channel 43 is too large, which reduces the increase in battery capacity and increases the cost of the cooling components.

[0068] As can be seen from Comparative Example 5, when the difference between the diameter D of the first part 44 and the width B of the second part 45 is too small, the battery qualification rate does not meet the requirements. The outer diameter of the first part 44 is insufficient, which reduces the increase in battery capacity, reduces the space of the cooling channel 43, and affects safety performance.

[0069] As can be seen from Comparative Example 6, when the difference between the diameter D of the first part 44 and the width B of the second part 45 is too large, the battery qualification rate does not meet the requirements. The outer diameter of the first part 44 is too large, which increases the difficulty of stamping the casing 4 and the overall weight, making it inconvenient for battery assembly.

[0070] 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 first pole group (1) and two second pole groups (2) are provided. The first pole group (1) has heat dissipation holes (11) extending along the first direction (X). The two second pole groups (2) are respectively disposed on both sides of the first pole group (1) in the second direction (Y). The two second pole groups (2) are electrically connected to the first pole group (1). The end of the second pole group (2) away from the first pole group (1) is provided with a tab (21). The end of the second pole group (2) where the tab (21) is disposed is provided with an assembly part (22). The cover plate assembly (3) includes a cover plate body (31) and a pole post (32). There are two cover plate bodies (31), which are respectively disposed at one end of the second pole group (2) where the pole tab (21) is disposed. The pole post (32) is disposed on the cover plate body (31) and electrically connected to the pole tab (21). The cover plate body (31) is provided with a snap-fit ​​part (311) at the position corresponding to the assembly part (22) so that the snap-fit ​​part (311) is snap-fitted to the assembly part (22). Along the second direction (Y), the snap-fit ​​part (311) protrudes from the pole post (32). The housing (4) and the cover plate body (31) enclose a space for accommodating the first pole group (1) and the second pole group (2). The housing (4) has a first opening (41) and a second opening (42) so that the first pole group (1) and the second pole group (2) can be inserted into the housing (4) respectively. The first direction (X) is the length direction of the cover plate body (31), and the second direction (Y) is the thickness direction of the cover plate body (31). The first direction (X) and the second direction (Y) are perpendicular.

2. The battery according to claim 1, characterized in that, The second pole group (2) has two assembly parts (22) at the end of the pole tab (21). The two assembly parts (22) are spaced apart along the first direction (X). An assembly groove (23) is formed between the two assembly parts (22). The pole tab (21) is disposed in the assembly groove (23). The pole post (32) is disposed on the bottom wall of the assembly groove (23).

3. The battery according to claim 1, characterized in that, The housing (4) is provided with a cooling channel (43) corresponding to the heat dissipation hole (11), and the cooling channel (43) is provided in close contact with the inner wall of the heat dissipation hole (11).

4. The battery according to claim 1, characterized in that, The first electrode group (1) is a circular ring structure, and the heat dissipation hole (11) is concentrically arranged with the first electrode group (1). The heat dissipation hole (11) is a through hole extending along the first direction (X).

5. The battery according to claim 4, characterized in that, The housing (4) includes a first part (44), a second part (45) and a connecting part (46). The first pole group (1) is disposed inside the first part (44), the second pole group (2) is disposed inside the second part (45), and the connecting part (46) is disposed at one end of the second part (45) facing the cover plate body (31). The connecting part (46) is engaged with the cover plate body (31).

6. The battery according to claim 5, characterized in that, A plug (47) is connected to the first part (44) at the position where the first opening (41) is opened, and the plug (47) is fixedly connected to the housing (4).

7. The battery according to claim 6, characterized in that, The wall thickness of the second part (45) is T1, and satisfies 0.3mm≤T1≤1.5mm; and / or, the wall thickness of the plug (47) is T2, and satisfies 0.5mm≤T2≤2mm.

8. The battery according to claim 5, characterized in that, Along the second direction (Y), the height of the connecting part (46) is H, and satisfies 10mm≤H≤80mm; and / or, along the first direction (X), the length of the connecting part (46) is L1, and the width of the second part (45) is A, and satisfies 0.55≤L1 / A≤0.

8.

9. The battery according to claim 5, characterized in that, The housing (4) is provided with a cooling channel (43) corresponding to the heat dissipation hole (11). The diameter of the cooling channel (43) is F, the diameter of the first part (44) is D, and 0.2≤F / D≤0.35 is satisfied; and / or, along the third direction (Z), the width of the second part (45) is B, and 20mm≤DB≤100mm is satisfied.

10. The battery according to any one of claims 1-9, characterized in that, Along the second direction (Y), the total length of the shell (4) is E, and satisfies 350mm≤E≤900mm.

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