Battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery which comprises a pole group, a cover plate assembly and a shell, the pole group is connected with a protruding part and a tab, and the protruding part and the tab are arranged at the end part of the pole group in a first direction; the cover plate assembly comprises a cover plate body, a pole and first plastic, the cover plate body is connected with a protective cover and a protective side plate, the pole is arranged on the cover plate body, the surface, away from the pole group, of the protective cover protrudes out of the surface, away from the pole group, of the pole in the first direction, and the first plastic is arranged between the cover plate body and the pole group. The first plastic cement is provided with a first connecting groove and a second connecting groove, the protruding part is clamped in the first connecting groove, and one end, facing the pole group, of the pole column is clamped in the second connecting groove; the shell and the cover plate body are connected and enclose to form a space for accommodating a pole group; the first direction is the height direction of the cover plate body. Therefore, the protruding part can improve the capacity of the battery and protect the pole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery. BACKGROUND

[0002] Lithium ion batteries are widely used as power batteries in electric vehicles and energy storage fields. With the increasing maturity of lithium ion battery technology, the performance and safety of lithium ion batteries are increasingly required.

[0003] The lithium ion battery includes a pole group, a cover plate and a shell. The pole group is connected with a tab. The cover plate is provided with a pole post connected with the tab. The end of the pole post away from the pole group is connected with a riveting block. The riveting block is protrudingly arranged on the cover plate. The cover plate is also provided with a relief valve to timely discharge the gas in the battery.

[0004] However, the space layout between the cover plate and the pole group is unreasonable, resulting in low internal space utilization, limited capacity of the battery, and difficulty in discharging the electrolyte at the pole post on the cover plate, which is prone to electrocorrosion of the pole post. The cover plate is usually an aluminum sheet structure with poor structural strength, making it difficult to assemble the cover plate and the pole group into the shell, which is prone to deformation and deviation, increasing the assembly difficulty and reducing the welding yield of the cover plate and the shell, affecting the safety of the battery. In addition, the protruding riveting block and the pole post lack protection measures and are prone to damage during transportation and assembly, affecting the performance of the battery. SUMMARY

[0005] The purpose of the present application is to provide a battery to solve the problems of low space utilization and low structural strength of the battery, and limited capacity of the battery.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] A battery comprises: a pole group connected with a protruding portion and a tab, the protruding portion and the tab are arranged at the end of the pole group in a first direction; a cover plate assembly comprising a cover plate body, a pole post and a first plastic, the cover plate body is connected with a protective cover and a protective side plate, the protective cover and the protective side plate form a space for accommodating the protruding portion, the pole post is arranged on the cover plate body, the surface of the protective cover away from the pole group is protrudingly arranged on the surface of the pole post away from the pole group in the first direction, the first plastic is arranged between the cover plate body and the pole group, the first plastic is provided with a first connecting groove and a second connecting groove, the protruding portion is clamped in the first connecting groove, and the end of the pole post towards the pole group is clamped in the second connecting groove; a shell connected with the cover plate body and enclosing a space for accommodating the pole group; the first direction is the height direction of the cover plate body.

[0008] As preferred, two of the protrusions are provided, and one of the tabs is provided between the two protrusions.

[0009] As preferred, the cover plate assembly further comprises a riveting block connected with the pole, and the protective cover protrudes from the surface of the riveting block away from the pole group in the first direction.

[0010] As preferred, the width of the protective cover in the second direction is A, and the length of the protective cover in the third direction is B, the second direction is the width direction of the cover plate body, the third direction is the length direction of the cover plate body, and 450mm 2 ≤A*B≤4500mm 2 ; and / or, the width of the protrusion in the second direction is W1, the width of the cover plate body in the second direction is W2, and 6mm≤W2-W1≤12mm, the second direction is the width direction of the cover plate body.

[0011] As preferred, the protective cover is welded with the protective side plate, the protective side plate is integrally formed with the cover plate body, or the protective cover is integrally formed with the protective side plate, and the protective side plate is welded with the cover plate body.

[0012] As preferred, the first plastic comprises a first part and a second part, the first part and the second part abut with two of the protrusions respectively, the first part and the second part are both provided with a half slot, and the half slot of the first part and the half slot of the second part are spliced to form the second connecting slot.

[0013] As preferred, the gap between the first part and the second part in the third direction is W4, and 0.15mm≤W4≤0.25mm; the third direction is the length direction of the cover plate body.

[0014] As preferred, the distance between the two protrusions in the third direction is C, the length of the riveting block is D, the third direction is the length direction of the cover plate body, and 0.65≤D / C≤0.84; and / or, the thickness of the cover plate body in the first direction is T3, the thickness of the protective cover in the first direction is T4, and 0.9mm≤T3-T4≤1.5mm.

[0015] As preferred, the first connecting slot and the second connecting slot are communicated.

[0016] Preferably, the first plastic protrudes towards the end surface of the pole group along the first direction and is arranged on the end surface of the cover plate body facing the pole group, the distance between the first plastic facing the end surface of the pole group and the end surface of the cover plate body facing the pole group is H2, and 2.8mm≤H2≤5.5mm is satisfied.

[0017] Advantages of the present application:

[0018] A battery comprises a pole group, a cover plate assembly and a shell, the pole group is connected with a protruding part and a tab, the protruding part and the tab are arranged at the end of the pole group in a first direction; the cover plate assembly comprises a cover plate body, a pole column and a first plastic, the cover plate body is connected with a protective cover and a protective side plate, the protective cover and the protective side plate enclose a space for accommodating the protruding part, the pole column is arranged on the cover plate body, along the first direction, the surface of the protective cover facing away from the pole group protrudes from the surface of the pole column facing away from the pole group, the first plastic is arranged between the cover plate body and the pole group, the first plastic is provided with a first connecting groove and a second connecting groove, the protruding part is clamped in the first connecting groove, and one end of the pole column facing the pole group is clamped in the second connecting groove; the shell is connected with the cover plate body and encloses a space for accommodating the pole group; the first direction is the height direction of the cover plate body.

[0019] In this way, the first plastic can be clamped with the pole column and the protruding part, improving the connection stability of the cover plate assembly and the pole group, the protruding part can not only increase the capacity of the battery, but also protect the pole column from being knocked by the outside during the process; making full use of the space at the end of the pole group to arrange the protruding part and the tab can improve the space utilization rate of the battery, make the internal structure of the battery more compact, the protective cover and the protective side plate can protect the protruding part and improve the structural strength of the cover plate assembly, and improve the safety and stability of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a battery in the first embodiment of the present application;

[0021] Figure 2 is a partial sectional view of the battery in the first embodiment of the present application;

[0022] Figure 3 is a structural schematic diagram of the pole group in the first embodiment of the present application;

[0023] Figure 4 is a sectional view of the cover plate assembly in the first embodiment of the present application;

[0024] Figure 5 is a top view of the cover plate assembly in the first embodiment of the present application;

[0025] Figure 6 is a front view of the protective cover in the first embodiment of the present application;

[0026] Figure 7 is a top view of the protective cover in the first embodiment of the present application;

[0027] Figure 8 is a first exploded view of the cover plate assembly in the first embodiment of the present application;

[0028] Figure 9 is a second exploded view of the cover plate assembly in the first embodiment of the present application;

[0029] Figure 10 is a structural schematic view of the battery in the second embodiment of the present application;

[0030] Figure 11 is a top view of the cover plate assembly in the second embodiment of the present application;

[0031] Figure 12 is a bottom view of the cover plate assembly in the second embodiment of the present application;

[0032] Figure 13 is a structural schematic view of the second part in the second embodiment of the present application;

[0033] Figure 14 is a sectional view of the protective cover and the protective side plate in the second embodiment of the present application;

[0034] Figure 15 is a sectional view of the cover plate body in the second embodiment of the present application;

[0035] Figure 16 is a first exploded view of the cover plate assembly in the second embodiment of the present application;

[0036] Figure 17 is a second exploded view of the cover plate assembly in the second embodiment of the present application.

[0037] In the drawings:

[0038] 1, pole group; 11, protrusion; 12, pole lug; 2, cover plate assembly; 21, cover plate body; 211, protective cover; 2111, boss; 212, protective side plate; 2121, step; 213, sink; 22, pole post; 23, riveting block; 24, first plastic; 241, first connecting groove; 242, second connecting groove; 243, first part; 244, second part; 245, half groove; 246, liquid discharge groove; 25, second plastic; 26, sealing ring; 3, shell; Z, first direction; Y, second direction; X, third direction. DETAILED DESCRIPTION

[0039] The present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the present application and not in limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings rather than all the parts.

[0040] In the description of the application, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] In the description of the present embodiment, the terms "up", "down", "right", and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0043] Embodiment one

[0044] Reference Figures 1 to 3The battery comprises a pole group 1, a cover plate assembly 2 and a shell 3, the pole group 1 is connected with a protruding part 11 and a pole lug 12, the protruding part 11 and the pole lug 12 are arranged at the end of the pole group 1 in a first direction Z; the cover plate assembly 2 comprises a cover plate body 21, a pole column 22 and a first plastic 24, the cover plate body 21 is connected with a protective cover 211 and a protective side plate 212, the protective cover 211 and the protective side plate 212 are enclosed to form a space for accommodating the protruding part 11, the pole column 22 is arranged on the cover plate body 21, the surface of the protective cover 211 away from the pole group 1 protrudes from the surface of the pole column 22 away from the pole group 1, the first plastic 24 is arranged between the cover plate body 21 and the pole group 1, the first plastic 24 is provided with a first connecting groove 241 and a second connecting groove 242, the protruding part 11 is clamped in the first connecting groove 241, and one end of the pole column 22 towards the pole group 1 is clamped in the second connecting groove 242; the shell 3 is connected with the cover plate body 21 and encloses a space for accommodating the pole group 1; the first direction Z is the height direction of the cover plate body 21.

[0045] In the embodiment, the protruding part 11 is integrally formed with the pole group 1, the pole lug 12 is arranged apart from the protruding part 11, the cover plate body 21, the protective cover 211 and the protective side plate 212 are all made of aluminum material, the pole column 22 is fixedly arranged on the cover plate body 21, the first plastic 24 is matched with the shape of the end of the pole group 1, the first connecting groove 241 is matched with the shape of the protruding part 11, that is, the position of the first plastic 24 where the first connecting groove 241 is arranged is protruding, the second connecting groove 242 is matched with the shape of one end of the pole column 22 towards the pole group 1, so as to limit the position of the pole column 22 on the cover plate body 21, and the edge of the cover plate body 21 is fixedly connected with the shell 3 by welding.

[0046] In this way, the first plastic 24 can be clamped with the pole column 22 and the protruding part 11, thereby improving the connection stability of the cover plate assembly 2 and the pole group 1, by arranging the protruding part 11, the battery capacity can be increased, and the pole column 22 can be protected, avoiding the pole column 22 from being knocked by the outside world, effectively utilizing the space of the end of the pole group 1 to arrange the protruding part 11 and the pole lug 12, improving the space utilization rate of the battery, the protective cover 211 and the protective side plate 212 can protect the protruding part 11 and improve the structural strength of the cover plate assembly 2, thereby improving the safety and stability of the battery.

[0047] It can be understood that the materials of the cover plate body 21, the protective cover 211 and the protective side plate 212 are not limited to aluminum material, but can also be stainless steel material, aluminum alloy material and the like, which will not be enumerated here.

[0048] Referring to Figure 2 and Figure 3 In some embodiments, two protruding parts 11 are arranged, and one pole lug 12 is arranged between the two protruding parts 11.

[0049] In this embodiment, the protruding part 11 is a right trapezoidal boss structure, two protruding parts 11 are symmetrically arranged at the end of the pole group 1, the tab 12 is arranged at the middle of the end of the pole group 1, and the length of the tab 12 is greater than the length of the protruding part 11, so that the tab 12 has sufficient flow capacity. Correspondingly, the first connecting groove 241, the protective side plate 212, and the protective cover 211 are each provided with two.

[0050] In this way, the two protruding parts 11 are symmetrically arranged, which can improve the battery capacity and make the stress of the end of the pole group 1 uniform, avoid deformation and damage of the pole group 1 due to stress concentration, improve the structural strength of the connection between the cover plate assembly 2 and the pole group 1, and reserve enough space for assembling the tab 12, so that the tab 12 can be stably connected with the pole 22, fully utilize the space between the end of the pole group 1 and the cover plate body 21, and improve the space utilization.

[0051] It can be understood that the shape and arrangement position of the protruding part 11 can be adjusted according to actual needs, which will not be enumerated here.

[0052] Referring to Figure 2 In some embodiments, the cover plate assembly 2 further comprises a riveting block 23, the riveting block 23 is connected with the pole 22, and the surface of the protective cover 211 away from the pole group 1 protrudes from the surface of the riveting block 23 away from the pole group 1 in the first direction Z.

[0053] In this embodiment, the riveting block 23 is arranged one by one with the pole 22, the riveting block 23 is fixedly connected with the pole 22 by welding, the height of the protruding part 11 is greater than the height of the riveting block 23, and the cover plate assembly 2 further comprises a second plastic 25, the second plastic 25 is arranged between the riveting block 23 and the cover plate body 21.

[0054] In this way, the protruding part 11 can increase the battery capacity while improving the protection effect of the riveting block 23, avoiding the riveting block 23 from colliding with the outside world, improving the space utilization of the cover plate assembly 2, and improving the connection stability of the cover plate assembly 2 and the pole group 1, thereby improving the safety and stability of the battery.

[0055] It can be understood that the arrangement position and number of the riveting block 23 can be adjusted according to actual needs, which will not be described here.

[0056] Referring to Figure 4 In some embodiments, the protective cover 211 and the protective side plate 212 are arranged by welding, and the protective side plate 212 is integrally formed with the cover plate body 21.

[0057] In the embodiment, the protective cover 211 is vertically arranged on the side of the cover plate body 21 away from the pole group 1, and the side of the protective cover 211 facing the protective side plate 212 is provided with a boss 2111 so that the protective cover 211 is clamped on the protective side plate 212. The boss 2111 is integrally formed with the protective cover 211.

[0058] Further, referring to Figures 5 to 9 , the cover plate assembly 2 further comprises an explosion-proof valve (not shown in the figure), which is fixedly connected with the protective cover 211 by welding.

[0059] In this way, the explosion-proof valve is arranged on the protective cover 211, which can make full use of the space of the cover plate assembly 2, so that the cover plate body 21 has enough space to assemble the pole column 22 and the riveting block 23, avoiding assembly interference between the explosion-proof valve and the riveting block 23, and maintaining enough strength to bear the riveting block 23 and the pole column 22, so that the overall structure of the cover plate assembly 2 is more compact, avoiding loosening and deviation of the components of the cover plate assembly 2 during assembly and use, improving the safety of the battery; during assembly, the explosion-proof valve can be welded with the protective cover 211 first, and then the protective cover 211 is welded to the protective side plate 212, improving the assembly efficiency.

[0060] Referring to Figures 3 to 7 , in some embodiments, along the second direction Y, the width of the protective cover 211 is A, along the third direction X, the length of the protective cover 211 is B, and 450mm 2 ≤A*B≤4500mm 2 , along the second direction Y, the width of the protruding part 11 is W1, and the width of the cover plate body 21 is W2, and 6mm≤W2-W1≤12mm.

[0061] In the embodiment, the product of the width A of the protective cover 211 and the length B of the protective cover 211 (i.e., the surface area of the protective cover 211) can be any value between 450mm 2 -4500mm 2 , or a range between any two values, such as 450mm 2 , 500mm 2 , 1000mm 2 , 1500mm 2 , 2000mm 2 , 2500mm 2 , 3000mm 2 , 3500mm 2 , 4000mm 2 , 4500mm 2 , etc.; the difference between the width W2 of the cover plate body 21 and the width W1 of the protruding part 11 can be any value between 6mm-12mm or a range between any two values, such as 6mm, 8mm, 10mm, 12mm, etc.

[0062] Thus, the protective cover 211 and the protective side plate 212 can protect the protruding portion 11 from external impact and deformation, and protect the riveting block 23 arranged below the protruding portion 11. By limiting the difference between the width W2 of the cover plate body 21 and the width W1 of the cover plate body 21, the protruding portion 11 can increase the battery capacity while ensuring the structural strength of the cover plate body 21 in the width direction, thereby improving the structural strength and space utilization of the battery.

[0063] It can be understood that the product of the width A of the protective cover 211 and the length B of the protective cover 211 cannot be too small, which will limit the volume of the protruding portion 11 and make it difficult to improve the battery capacity and have no space to arrange the explosion-proof valve. The product of the width A of the protective cover 211 and the length B of the protective cover 211 cannot be too large, which will make the size of the protruding portion 11 too large, occupy too much space of the cover plate body 21, and affect the size of the tab 12, thereby affecting the overcurrent capacity of the tab 12. The difference between the width W2 of the cover plate body 21 and the width W1 of the protruding portion 11 cannot be too small, which will make the protruding portion 11 too close to the edge of the cover plate body 21, affect the assembly of the cover plate body 21 and the shell 3, and reduce the welding yield. The difference between the width W2 of the cover plate body 21 and the width W1 of the protruding portion 11 cannot be too large, which will make the protruding portion 11 too far from the edge of the cover plate body 21, make the size of the protruding portion 11 insufficient or the size of the cover plate body 21 too large, and reduce the space utilization of the cover plate assembly 2.

[0064] Referring to Figure 4 In some embodiments, along the first direction Z, the first plastic 24 protrudes towards the end face of the pole group 1 and is arranged on the end face of the cover plate body 21 towards the pole group 1. The distance between the end face of the first plastic 24 towards the pole group 1 and the end face of the cover plate body 21 towards the pole group 1 is H2, and satisfies 2.8mm≤H2≤5.5mm.

[0065] In this embodiment, the distance H2 between the end face of the first plastic 24 towards the pole group 1 and the end face of the cover plate body 21 towards the pole group 1 can be any value between 2.8mm-5.5mm or a range between any two values, such as 2.8mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, etc.

[0066] Thus, the first plastic 24 is arranged protruding from the end of the cover plate body 21, which can improve the structural strength of the end of the cover plate body 21, reduce the risk of deformation of the end of the cover plate body 21 and the pole group 1 when the pole group 1 enters the shell and the pole group 1 collides with the shell 3, and improve the sealing performance and insulation performance of the connection between the pole group 1 and the cover plate body 21, thereby improving the safety of the battery.

[0067] It can be understood that the distance H2 between the end face of the first plastic 24 towards the pole group 1 and the end face of the cover plate body 21 towards the pole group 1 cannot be too small, otherwise the first plastic 24 cannot provide support for the cover plate body 21, and the heat melting rate of the insulation film wrapped on the pole group 1 is reduced. The distance H2 between the end face of the first plastic 24 towards the pole group 1 and the end face of the cover plate body 21 towards the pole group 1 cannot be too large, otherwise the protruding part 11 of the first plastic 24 is too high, which occupies the internal space of the shell 3 and increases the risk of assembly interference with the pole group 1.

[0068] In order to verify the rationality of the width A of the protective cover 211, the length B of the protective cover 211, the thickness T1 of the protective cover 211 and the boss 2111, the thickness T2 of the protective side plate 212, the height H1 of the protective side plate 212, the distance H2 between the end face of the first plastic 24 towards the pole group 1 and the end face of the cover plate body 21 towards the pole group 1, the width W1 of the protruding part 11, the width W2 of the cover plate body 21, and the distance W3 between the protective side plate 212 and the second plastic 25, six groups of examples and six groups of comparative examples are provided in the present embodiment, as shown in Table 1.

[0069] Table 1

[0070]

[0071] As can be seen from Examples 1 to 6 in Table 1, after meeting the range requirements, the qualified rate of the battery meets the requirements, and there is no abnormal assembly of the cover plate assembly 2 and abnormal structural strength. The cover plate body 21, the protective cover 211, the pole group 1 and the tab 12 are not damaged or deformed.

[0072] As can be seen from Comparative Example 1 in Table 1, when the product of the width A of the protective cover 211 and the length B of the protective cover 211 is too small, the qualified rate of the battery does not meet the requirements, the size of the protruding part 11 is insufficient, the explosion-proof valve cannot be arranged, the battery capacity is affected, and the pole group 1 is easily damaged.

[0073] As can be seen from Comparative Example 2 in Table 1, when the product of the width A of the protective cover 211 and the length B of the protective cover 211 is too large, the qualified rate of the battery does not meet the requirements, the size of the protruding part 11 is too large, which exceeds the applicable range of the cover plate body 21, the structural strength of the cover plate body 21 is reduced, the size of the riveting block 23 is affected, and the overcurrent capacity of the battery is limited.

[0074] As can be seen from Comparative Example 3 in Table 1, when the difference between the width W2 of the cover plate body 21 and the width W1 of the cover plate body 21 is too small, the qualified rate of the battery does not meet the requirements, the protruding part 11 is too far away from the edge of the cover plate, which is not conducive to the control of the flatness of the cover plate body 21, and the welding rate of the shell cover is reduced.

[0075] As can be seen from the comparative example 4 in Table 1, when the difference between the width W2 of the cover plate body 21 and the width W1 of the cover plate body 21 is too large, the qualified rate of the battery cell does not meet the requirement, the protruding portion 11 is too close to the edge of the cover plate, which affects the size of the protruding portion 11 and reduces the capacity of the battery.

[0076] As can be seen from the comparative example 5 in Table 1, when the distance H2 between the end surface of the first plastic 24 facing the pole group 1 and the end surface of the cover plate body 21 facing the pole group 1 is too small, the qualified rate of the battery cell does not meet the requirement, the protruding height of the first plastic 24 is insufficient, which cannot effectively support and melt the insulating film, and reduces the melting rate.

[0077] As can be seen from the comparative example 6 in Table 1, when the distance H2 between the end surface of the first plastic 24 facing the pole group 1 and the end surface of the cover plate body 21 facing the pole group 1 is too small, the qualified rate of the battery cell does not meet the requirement, the protruding height of the first plastic 24 is too high, which increases the structural weight and cost, occupies the space of the pole group 1, and reduces the space utilization rate.

[0078] Example Two

[0079] The same or corresponding parts of Example Two and Example One use the corresponding reference numerals of Example One. For the sake of simplicity, only the difference between Example Two and Example One is described.

[0080] Referring to Figure 10 and Figure 11 In some embodiments, the protective cover 211 and the protective side plate 212 are integrally formed, and the protective side plate 212 is welded to the cover plate body 21. In this embodiment, the protective cover 211 and the protective side plate 212 form a downwardly open rectangular structure, and the protective side plate 212 integrally forms a step 2121 at the edge away from the protective cover 211, and the cover plate body 21 is provided with a recess 213 at a position corresponding to the step 2121, so as to facilitate the clamping of the protective side plate 212 and the cover plate body 21, and to leave sufficient welding space.

[0081] In this way, the integrally formed protective cover 211 and protective side plate 212 are first processed, and then the protective side plate 212 provided with the protective cover 211 is welded to the cover plate body 21, which improves the assembly efficiency and the connection strength between the protective cover 211 and the protective side plate 212, so as to provide stable protection for the protruding portion 11, improve the structural strength of the cover plate assembly 2, reduce the deformation and deviation of the cover plate assembly 2 and the pole group 1 caused by external force during the assembly process, improve the welding rate of the cover plate body 21 and the shell 3, and improve the safety of the battery.

[0082] It can be understood that the connection relationship between the protective cover 211, the protective side plate 212 and the cover plate body 21 can be adjusted according to actual needs, which will not be enumerated here.

[0083] Referring to Figure 12In some embodiments, the first plastic 24 includes a first part 243 and a second part 244, the first part 243 and the second part 244 are respectively in abutment with the two protrusions 11, and the first part 243 and the second part 244 are both provided with a half slot 245, and the half slot 245 of the first part 243 and the half slot 245 of the second part 244 are spliced to form the second connecting slot 242.

[0084] In the embodiment, the first part 243 and the second part 244 are symmetrically arranged on the side of the cover plate body 21 facing the pole group 1, and the cover plate assembly 2 further includes a sealing ring 26, the sealing ring 26 is sleeved on the pole column 22 and connected with the first part 243 and the second part 244, the first connecting slot 241 arranged on the first part 243 is in communication with the corresponding half slot 245, and the first connecting slot 241 arranged on the second part 244 is in communication with the corresponding half slot 245.

[0085] In this way, the split design of the first plastic 24 facilitates assembly and reduces the risk of torsion during assembly, thereby reducing assembly errors, limiting the positions of the first part 243 and the second part 244 on the cover plate body 21, facilitating the discharge of the electrolyte in the second connecting slot 242 into the first connecting slot 241, reducing the corrosion of the electrolyte on the pole column 22, and improving the safety of the battery.

[0086] Referring to Figure 12 In some embodiments, along the third direction X, the gap between the first part 243 and the second part 244 is W4, and satisfies 0.15mm≤W4≤0.25mm; the third direction X is the length direction of the cover plate body 21.

[0087] In the embodiment, the gap W4 between the first part 243 and the second part 244 can be any value between 0.15mm-0.25mm or a range between any two values, for example, 0.15mm, 0.17mm, 0.19mm, 0.2mm, 0.21mm, 0.23mm, 0.25mm, etc.

[0088] In this way, the gap between the first part 243 and the second part 244 can reduce the risk of interference between the first part 243 and the second part 244 during assembly, improve assembly efficiency, and improve the structural strength of the connection between the cover plate body 21 and the pole group 1, fully utilize the space at the end of the pole group 1, and make the internal structure of the battery more compact.

[0089] It can be understood that the gap W4 between the first part 243 and the second part 244 cannot be too small, otherwise assembly interference will occur between the first part 243 and the second part 244, and the gap W4 between the first part 243 and the second part 244 cannot be too large, otherwise the insulation performance between the cover plate body 21 and the pole group 1 will be affected, the risk of short circuit will be increased, and the safety of the battery will be reduced.

[0090] Referring toFigures 11 to 15 In some embodiments, the distance between the two protrusions 11 along the third direction X is C, the length of the riveting block 23 is D, and 0.65≤D / C≤0.84 is satisfied, the thickness of the cover plate body 21 along the first direction Z is T3, the thickness of the protective cover 211 is T4, and 0.9mm≤T3-T4≤1.5mm is satisfied.

[0091] In the embodiment, the ratio of the length D of the riveting block 23 to the distance C between the two protrusions 11 can be any value between 0.65-0.84 or a range between any two values, such as 0.65, 0.7, 0.75, 0.8, 0.84, etc.; the difference between the thickness T3 of the cover plate body 21 and the thickness T4 of the protective cover 211 can be any value between 0.9mm-1.5mm or a range between any two values, such as 0.9mm, 1mm, 1.1mm, 1.3mm, 1.5mm, etc.

[0092] In this way, the space on the cover plate body 21 can be utilized to set the riveting block 23 and the protrusions 11, improve the space utilization, and make the cover plate body 21 have sufficient structural strength, reduce the risk of deformation and deviation of the pole group 1 during entering the shell, and the protective cover 211 can protect the end of the protrusion 11 away from the pole group 1 from colliding with the outside world, thereby improving the safety and stability of the battery.

[0093] It can be understood that the ratio of the length D of the riveting block 23 to the distance C between the two protrusions 11 cannot be too small, otherwise it will lead to insufficient length of the riveting block 23, affecting the flow capacity, and the ratio of the length D of the riveting block 23 to the distance C between the two protrusions 11 cannot be too large, otherwise it will occupy too much space on the cover plate body 21, which is not conducive to the welding of the cover plate body 21 and the shell 3; the difference between the thickness T3 of the cover plate body 21 and the thickness T4 of the protective cover 211 cannot be too small, otherwise it will lead to small thickness of the cover plate body 21, increasing the risk of deformation of the cover plate body 21 during welding, and the difference between the thickness T3 of the cover plate body 21 and the thickness T4 of the protective cover 211 cannot be too large, otherwise it will lead to too large weight of the cover plate body 21, reducing the space utilization in the thickness direction of the cover plate body 21.

[0094] Referring to Figure 16 and Figure 17 In some embodiments, the first connecting groove 241 and the second connecting groove 242 are in communication, the first plastic 24 is provided with a drainage groove 246, the two ends of the drainage groove 246 are respectively in communication with the first connecting groove 241 and the half groove 245, and the drainage groove 246 extends along the third direction X.

[0095] In the embodiment, one drainage groove 246 is arranged on the first part 243 and the second part 244 respectively, the width of the first connecting groove 241 and the width of the second connecting groove 242 are both greater than the width of the drainage groove 246, and the two ends of the drainage groove 246 are connected to the first connecting groove 241 and the half groove 245 smoothly, so as to facilitate the flow of the electrolyte along the drainage groove 246 to the first connecting groove 241.

[0096] In this way, the first connecting groove 241 and the second connecting groove 242 are communicated, the electrolyte in the second connecting groove 242 can flow to the first connecting groove 241, the corrosion of the electrolyte to the pole column 22 is reduced, and the protruding part 11 is immersed in the electrolyte. By arranging the drainage groove 246, the electrolyte in the second connecting groove 242 can flow to the first connecting groove 241 along the drainage groove 246 during the battery assembly process, the corrosion of the electrolyte to the pole column 22 is reduced, the safety of the battery is improved, and the space on the side of the first plastic 24 facing the pole group 1 can be effectively utilized, so that the internal structure of the battery is more compact.

[0097] In order to verify the rationality of the distance H3 from the surface of the protection side plate 212 facing the pole group 1 to the surface of the protection cover 211 away from the pole group 1, the distance C of the two protruding parts 11, the length D of the riveting block 23, the gap W4 between the first part 243 and the second part 244, the width W5 of the drainage groove 246, the minimum distance L between the protection side plate 212 and the edge of the cover plate body 21, the thickness T3 of the cover plate body 21, and the thickness T4 range of the protection cover 211, six groups of examples and six groups of comparative examples are provided as shown in Table 2.

[0098] Table 2

[0099]

[0100] As can be seen from Table 2, when the ranges are satisfied, the qualified rate of the battery meets the requirements, and there is no abnormal assembly of the cover plate assembly 2 and no abnormal structure strength. The cover plate body 21, the protruding part 11, the pole group 1 and the tab 12 are not damaged and deformed.

[0101] As can be seen from Table 2, when the difference between the thickness T3 of the cover plate body 21 and the thickness T4 of the protection cover 211 is too small, the qualified rate of the battery does not meet the requirements, the thickness of the bottom of the sink groove 213 of the cover plate body 21 is insufficient, and local deformation occurs during laser welding, resulting in poor shell cover welding.

[0102] As can be seen from Table 2, when the difference between the thickness T3 of the cover plate body 21 and the thickness T4 of the protection cover 211 is too large, the qualified rate of the battery does not meet the requirements, the thickness of the bottom of the sink groove 213 of the cover plate body 21 is too thick, resulting in an increase in the thickness of the cover plate body 21, an increase in cost and weight.

[0103] From Table 2, the proportion of riveting block 23 length D and the distance C between two protrusions 11 is too small, the qualified rate of the battery cell does not meet the requirements, the riveting block 23 length proportion is insufficient, and the over-current requirement of the battery cell cannot be met, thereby reducing the battery performance.

[0104] From Table 2, the proportion of riveting block 23 length D and the distance C between two protrusions 11 is too small, the qualified rate of the battery cell does not meet the requirements, the riveting block 23 length proportion is too large, the weight of the cover plate assembly 2 is increased, the riveting block 23 flatness consistency is low, and the riveting assembly reserved gap is too small, which is not conducive to riveting assembly.

[0105] From Table 2, the gap W4 between the first part 243 and the second part 244 is too small, the qualified rate of the battery cell does not meet the requirements, and the gap between the first part 243 and the second part 244 is too small. When assembling, errors occur, resulting in assembly interference and poor sealing.

[0106] From Table 2, when the gap W4 between the first part 243 and the second part 244 is too large, the qualified rate of the battery cell does not meet the requirements, the gap between the first part 243 and the second part 244 is too large, the insulation performance is insufficient, there is a risk of internal short circuit, and the safety performance of the battery is reduced.

[0107] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. It is not necessary or possible to exhaust all embodiments here. Any modification, equivalent substitution and improvement within the spirit and principles of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A battery, characterized in that, include: A pole assembly (1) is connected with a protrusion (11) and a tab (12), the protrusion (11) and the tab (12) being disposed at the end of the pole assembly (1) in the first direction (Z); A cover plate assembly (2) includes a cover plate body (21), a pole post (22), and a first plastic part (24). The cover plate body (21) is connected to a protective cover (211) and a protective side plate (212). The protective cover (211) and the protective side plate (212) enclose a space for accommodating the protrusion (11). The pole post (22) is disposed on the cover plate body (21) along the first direction (Z). The protective cover (211) is away from the protrusion (11). The surface of the electrode assembly (1) protrudes from the electrode post (22) and is disposed away from the surface of the electrode assembly (1). The first plastic (24) is disposed between the cover plate body (21) and the electrode assembly (1). The first plastic (24) has a first connecting groove (241) and a second connecting groove (242). The protrusion (11) is engaged in the first connecting groove (241), and the end of the electrode post (22) facing the electrode assembly (1) is engaged in the second connecting groove (242). The housing (3) is connected to the cover plate body (21) and encloses a space for accommodating the pole group (1); The first direction (Z) is the height direction of the cover plate body (21).

2. The battery according to claim 1, characterized in that, Two protrusions (11) are provided, and one electrode (12) is provided, with the electrode (12) positioned between the two protrusions (11).

3. The battery according to claim 1, characterized in that, The cover plate assembly (2) further includes a riveting block (23) connected to the pole post (22). Along the first direction (Z), the protective cover (211) is positioned on the surface of the pole group (1) opposite to the pole group (1) and protrudes from the surface of the riveting block (23) opposite to the pole group (1).

4. The battery according to claim 1, characterized in that, Along the second direction (Y), the width of the protective cover (211) is A, and along the third direction (X), the length of the protective cover (211) is B. The second direction (Y) is the width direction of the cover body (21), and the third direction (X) is the length direction of the cover body (21), and satisfies 450mm. 2 ≤A*B≤4500mm 2 ; and / or, along the second direction (Y), the width of the protrusion (11) is W1, the width of the cover body (21) is W2, and satisfies 6mm≤W2-W1≤12mm, where the second direction (Y) is the width direction of the cover body (21).

5. The battery according to claim 3, characterized in that, The protective cover (211) is welded to the protective side plate (212), and the protective side plate (212) is integrally formed with the cover body (21). Alternatively, the protective cover (211) is integrally formed with the protective side plate (212), and the protective side plate (212) is welded to the cover body (21).

6. The battery according to claim 5, characterized in that, The first plastic (24) includes a first part (243) and a second part (244). The first part (243) and the second part (244) respectively abut against the two protrusions (11). The first part (243) and the second part (244) are each provided with a half groove (245). The half groove (245) of the first part (243) and the half groove (245) of the second part (244) are spliced ​​together to form the second connecting groove (242).

7. The battery according to claim 6, characterized in that, Along the third direction (X), the gap between the first part (243) and the second part (244) is W4, and satisfies 0.15mm≤W4≤0.25mm; The third direction (X) is the length direction of the cover plate body (21).

8. The battery according to claim 5, characterized in that, Along the third direction (X), the distance between the two protrusions (11) is C, the length of the rivet block (23) is D, the third direction (X) is the length direction of the cover body (21), and satisfies 0.65≤D / C≤0.84; and / or, along the first direction (Z), the thickness of the cover body (21) is T3, the thickness of the protective cover (211) is T4, and satisfies 0.9mm≤T3-T4≤1.5mm.

9. The battery according to any one of claims 1-8, characterized in that, The first connecting groove (241) is connected to the second connecting groove (242).

10. The battery according to any one of claims 1-8, characterized in that, Along the first direction (Z), the end face of the first plastic (24) facing the electrode group (1) protrudes from the end face of the cover plate body (21) facing the electrode group (1). The distance between the end face of the first plastic (24) facing the electrode group (1) and the end face of the cover plate body (21) facing the electrode group (1) is H2, and satisfies 2.8mm≤H2≤5.5mm.

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