Battery cell, battery pack and electric device

Abstract

The utility model discloses a battery monomer, battery pack and electric device, the utility model relates to battery technical field, the battery monomer includes: shell and electrode subassembly, shell includes end cap and shell main part, end cap and shell main part are fixedly connected to define the installation cavity together, the electrode subassembly is provided in the installation cavity, and the shell main part is equipped with the installation cavity. A boss structure protruding out of the end cover is formed on the outer surface, away from the mounting cavity, of the end cover and used for being connected with an information collecting piece. The boss structure protruding out of the end cover is formed on the outer surface, deviating from the installation cavity, of the end cover and used for being connected with the information collection part, the external space of the end cover can be reasonably utilized, interference between the information collection part and other parts is reduced, the space utilization rate can be increased, the boss structure can further facilitate installation and positioning of the information collection part, and the installation efficiency is improved. The risk that the end cover is damaged when the boss structure is connected with the information acquisition piece can be reduced, and then the single battery can be protected.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, a battery pack, and an electrical device. Background Technology

[0002] In related technologies, the existing information acquisition devices for battery cells are usually designed on external tabs for collecting voltage information. This not only occupies space in the battery cell but also makes it difficult to locate the information acquisition devices. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this utility model is to provide a battery cell that can reduce interference between the information acquisition component and other parts, improve space utilization, facilitate the installation and positioning of the information acquisition component, reduce the risk of damage to the end cap when the boss structure is connected to the information acquisition component, and thus protect the battery cell.

[0004] This utility model further proposes a battery pack having the above-mentioned battery cells.

[0005] This utility model further proposes an electrical device having the above-mentioned battery pack.

[0006] According to an embodiment of the present invention, a battery cell includes: a housing and an electrode assembly. The housing includes an end cap and a housing body. The end cap and the housing body are fixedly connected to jointly define a mounting cavity. The electrode assembly is disposed in the mounting cavity. The end cap has a boss structure protruding from the end cap on its outer surface away from the mounting cavity. The boss structure is used to connect an information acquisition device.

[0007] According to the embodiments of the present invention, the battery cell has a boss structure protruding from the end cover on the outer surface of the end cover away from the mounting cavity. The boss structure is used to connect the information acquisition device, which is conducive to the rational use of the external space of the end cover, reduces the interference between the information acquisition device and other parts, and can improve the space utilization rate. The boss structure can also facilitate the installation and positioning of the information acquisition device, reduce the risk of damaging the end cover when the boss structure is connected to the information acquisition device, and thus can protect the battery cell.

[0008] According to some embodiments of the present invention, the battery cell further includes an explosion-proof structure, which is disposed on the shell body.

[0009] According to some embodiments of the present invention, the shell body has a mounting wall, which includes a first wall portion and a second wall portion. The thickness of the first wall portion is greater than the thickness of the second wall portion, and the second wall portion is arranged around the first wall portion. An explosion-proof structure is provided on the first wall portion.

[0010] According to some embodiments of the utility model, the first wall part is formed with a mounting hole penetrating through the first wall part, and the explosion-proof structure is arranged in the mounting hole.

[0011] According to some embodiments of the utility model, the explosion-proof structure and the mounting cavity are spaced apart, and the end face of the explosion-proof structure away from the mounting cavity is aligned with the end face of the first wall part away from the mounting cavity.

[0012] According to some embodiments of the utility model, the inner side wall of the mounting hole is formed with a support boss, the support boss is located on the side of the explosion-proof structure facing the mounting cavity, and the support boss and the explosion-proof structure are in abutment.

[0013] According to some embodiments of the utility model, the spacing distance between the mounting hole and the edge of the second wall part is greater than or equal to 3mm.

[0014] According to some embodiments of the utility model, the thickness of the first wall part is D1, the thickness of the second wall part is D2, and 0.2mm≤D1-D2≤1mm.

[0015] According to some embodiments of the utility model, the battery monomer further comprises: an insulating film, the insulating film is sleeved on the electrode assembly and located in the mounting cavity.

[0016] According to some embodiments of the utility model, the insulating film comprises: an insulating film main body, the insulating film main body is annular to define a mounting space for mounting the electrode assembly, the insulating film main body has a first insulating film wall part corresponding to the welding area of the shell main body; a first protective layer, the first protective layer is arranged on the outer surface of the first insulating film wall part.

[0017] According to some embodiments of the utility model, the thickness of the first protective layer is greater than or equal to 0.2mm.

[0018] According to some embodiments of the utility model, the insulating film main body further has a plurality of second insulating film wall parts, the first insulating film wall part and the plurality of second insulating film wall parts are sequentially connected in head-to-tail mode to form the mounting space, one of the plurality of second insulating film wall parts is formed with a first through hole, and the first through hole corresponds to the explosion-proof structure on the shell main body.

[0019] According to some embodiments of the utility model, at least one of the plurality of second insulating film wall parts is formed with a second through hole, and the second through hole is used for electrolyte infiltration.

[0020] According to some embodiments of the utility model, the second insulating film wall part formed with the first through hole is formed with the second through hole.

[0021] According to some embodiments of the utility model, one of the plurality of second insulation film wall parts is opposite and spaced apart from the first insulation film wall part, and the second insulation film wall part opposite and spaced apart from the first insulation film wall part is formed with the first through hole and the second through hole.

[0022] According to some embodiments of the utility model, the shell body includes a plurality of shell walls, part of the shell walls are formed with welding areas, the inner side of the shell wall formed with the welding area is provided with a second protective layer, the inner side of another part of the shell walls is provided with a first insulation layer, and the surface of the second protective layer away from the corresponding shell wall is provided with the first insulation layer.

[0023] According to some embodiments of the utility model, the structural strength of the second protective layer is greater than that of the first insulation layer.

[0024] According to some embodiments of the utility model, the thickness of the second protective layer is greater than that of the first insulation layer.

[0025] According to some embodiments of the utility model, the first insulation layer arranged on the other part of the shell wall and the first insulation layer arranged on the second protective layer are integrally formed.

[0026] According to some embodiments of the utility model, the inner surface of the shell body is provided with a second insulation layer.

[0027] According to some embodiments of the utility model, the thickness of the second insulation layer is D3, 0mm < D3 ≤ 0.3mm.

[0028] According to some embodiments of the utility model, the battery monomer further includes: a fixing support and a plastic part, the fixing support and the plastic part are both arranged in the mounting cavity, the plastic part is located between the end cover and the fixing support, the electrode assembly is located on the side of the fixing support away from the end cover, the side of the fixing support facing the end cover is formed with a mounting groove, and at least part of the plastic part is assembled in the mounting groove.

[0029] According to some embodiments of the utility model, the shell body is annular and has opposite first and second open mouths, the end cover is two, the two end covers are arranged at the first and second open mouths respectively, the fixing support and the plastic part are both two, the two fixing supports are opposite and spaced apart along the arrangement direction of the two end covers, the electrode assembly is assembled between the two fixing supports, and the two plastic parts are arranged between the corresponding end cover and fixing support.

[0030] The battery pack according to the utility model embodiment comprises the battery monomer of the above embodiment.

[0031] The electric device according to the utility model embodiment comprises the battery pack of the above embodiment.

[0032] Additional aspects and advantages of the present application will be given in part in the following description and will be apparent from the description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is a structure schematic view of the shell of the embodiment of the present application;

[0035] Figure 2 is a partial sectional view of the shell of the first embodiment of the present application;

[0036] Figure 3 is a partial sectional view of the shell of the second embodiment of the present application;

[0037] Figure 4 is a structure schematic view of the insulation film of the embodiment of the present application;

[0038] Figure 5 is a sectional view of the first insulation film wall portion of the embodiment of the present application;

[0039] Figure 6 is a sectional view of the insulation film and the shell after assembly of the embodiment of the present application;

[0040] Figure 7 is a cross-sectional schematic view of the shell of the embodiment of the present application;

[0041] Figure 8 is a longitudinal cross-sectional schematic view of the shell of the embodiment of the present application;

[0042] Figure 9 is a structure schematic view of the battery cell of the embodiment of the present application;

[0043] Figure 10 is an exploded schematic view of the end cover and the fixing support of the embodiment of the present application;

[0044] Figure 11 is a structure schematic view of the first support of the embodiment of the present application;

[0045] Figure 12 is a sectional view of the end cover, the plastic part, and the fixing support after assembly of the embodiment of the present application;

[0046] Figure 13 is a structure schematic view of the second insulation layer of the embodiment of the present application.

[0047] REFERENCE NUMERALS:

[0048] Battery cell 200;

[0049] Housing 100;

[0050] Shell body 10; mounting cavity 11; end cover 12; boss structure 13; shell wall 14; second protective layer 15; first insulating layer 16; second insulating layer 17; pole 18;

[0051] Mounting wall 20; first wall portion 21; second wall portion 22; mounting hole 23; support boss 24; narrow side wall 25; wide side wall 26;

[0052] Explosion-proof structure 30;

[0053] Fixing bracket 40; first bracket 401; second bracket 402; first clamping hole 403; buckle 404;

[0054] Plastic part 41; mounting groove 42; first mounting groove 421; second mounting groove 422;

[0055] Welding area 50;

[0056] Insulating film 300;

[0057] Insulating film body 301; first insulating film wall portion 302; second insulating film wall portion 303; first through hole 304; second through hole 305; mounting space 306; first protective layer 307. DETAILED DESCRIPTION

[0058] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0059] The following will be described with reference to Figures 1-13 The battery cell 200 according to the embodiments of the present application is described below, comprising: a housing 100 and an electrode assembly, the housing 100 comprising an end cover 12 and a shell body 10, the end cover 12 and the shell body 10 being fixedly connected to jointly define a mounting cavity 11, the electrode assembly being arranged in the mounting cavity 11, the outer surface of the end cover 12 facing away from the mounting cavity 11 forming a boss structure 13 protruding from the end cover 12, the boss structure 13 being used to connect an information acquisition piece.

[0060] Among them, the information acquisition piece can be a temperature information acquisition piece, a voltage information acquisition piece, etc., and the present application takes the voltage information acquisition piece as an example for description. As shown in Figure 1As shown, the shell 100 can be made of a metal material, for example, the shell 100 can be made of aluminum, steel and other metal materials, and the shell 100 is made of aluminum material as an example for description, the aluminum material has good processing performance and high strength, which can provide sufficient protection for the battery monomer 200 to ensure the normal operation of the battery monomer 200. The shell 100 includes an end cover 12 and a shell body 10, and the end cover 12 and the shell body 10 are fixedly connected to jointly define a mounting cavity 11, and the electrode assembly is arranged in the mounting cavity 11, which can protect the electrode assembly from damage caused by external impact, vibration and extrusion, thereby improving the performance and service life of the battery monomer 200. As shown in Figure 1 and Figure 10 As shown, the end cover 12 can be provided with a plurality of pole columns 18 to meet the large current charging and discharging requirements of the battery monomer 200, and as an example of the present application, the end cover 12 can be provided with three pole columns 18, which can more effectively distribute the current, reduce the current load of a single pole column 18, thereby reducing heat generation and resistance loss, and help to improve the energy efficiency and cycle life of the battery monomer 200.

[0061] Further, the nickel sheet can also be welded on the boss structure 13 to facilitate positioning of the nickel sheet during the welding process, thereby reducing the welding difficulty of the nickel sheet, and at the same time, since the end cover 12 has a greater thickness at the boss structure 13, the risk of welding through the end cover 12 during welding of the nickel sheet is also reduced, thereby protecting the battery monomer 200. The nickel sheet has good electrical conductivity, and welding the nickel sheet on the boss structure 13 can achieve reliable connection between the information acquisition member and the internal circuit of the battery monomer 200, thereby improving the transmission accuracy of the voltage information.

[0062] According to the battery monomer 200 of the embodiment of the present application, the boss structure 13 protruding from the end cover 12 is formed on the outer surface of the end cover 12 away from the mounting cavity 11, and the boss structure 13 is used to connect the information acquisition member, which is beneficial to reasonably utilize the external space of the end cover 12, reduce the interference between the information acquisition member and other parts, improve the space utilization, the boss structure 13 can also facilitate the installation and positioning of the information acquisition member, and the end cover 12 has a greater thickness at the boss structure 13, which can reduce the risk of damaging the end cover 12 when the boss structure 13 is connected with the information acquisition member, thereby protecting the battery monomer 200.

[0063] According to some embodiments of the present application, as shown in Figures 2-4 The battery monomer 200 further comprises an explosion-proof structure 30 arranged on the shell body 10.

[0064] The explosion-proof structure 30 can be an explosion-proof valve, an explosion-proof film, etc. The explosion-proof structure 30 is taken as an explosion-proof valve for example in the present application. When the internal gas pressure of the battery monomer 200 increases to a certain extent, the explosion-proof valve will automatically open to release the internal pressure of the battery monomer 200, thereby avoiding the explosion of the shell 100 due to excessive pressure.

[0065] The explosion-proof structure 30 is arranged on the shell main body 10. For example, the explosion-proof structure 30 and the shell main body 10 can be fixedly connected through welding, or the explosion-proof structure 30 and the shell main body 10 can be fixedly connected through adhesion, but the present application is not limited thereto. The explosion-proof structure 30 and the shell main body 10 can also be fixedly connected through other manners, as long as the explosion-proof structure 30 is arranged on the shell main body 10. The explosion-proof structure 30 and the shell main body 10 are taken as an example of being fixedly connected through laser welding in the present application. Laser welding connection can firmly connect the explosion-proof structure 30 and the shell main body 10 together. Not only can it better resist external impact and vibration, improve the stability and safety of the battery monomer 200, but also can effectively prevent the explosion-proof structure 30 from loosening or falling off during use, and can also realize the sealing of the explosion-proof structure 30 and the shell main body 10, thereby effectively preventing the leakage of the medium in the battery monomer 200, which is conducive to improving the safety performance of the battery monomer 200, and further improving the safety and reliability of the battery monomer 200.

[0066] According to some embodiments of the present application, as shown in Figures 2-4 The shell main body 10 has a mounting wall 20, and the mounting wall 20 includes a first wall portion 21 and a second wall portion 22. The thickness of the first wall portion 21 is greater than the thickness of the second wall portion 22. The second wall portion 22 is arranged around the first wall portion 21, and the explosion-proof structure 30 is arranged on the first wall portion 21.

[0067] The shell main body 10 has a mounting wall 20, and the mounting wall 20 includes a first wall portion 21 and a second wall portion 22. The thickness of the first wall portion 21 is greater than the thickness of the second wall portion 22. The second wall portion 22 is arranged around the first wall portion 21, and the explosion-proof structure 30 is arranged on the first wall portion 21.

[0068] The explosion-proof structure 30 is arranged on the first wall portion 21, for example, the explosion-proof structure 30 and the first wall portion 21 can be fixedly connected through welding, or the explosion-proof structure 30 and the first wall portion 21 can be fixedly connected through bonding, but the utility model is not limited to this, the explosion-proof structure 30 and the first wall portion 21 can also be fixedly connected through other modes, as long as the explosion-proof structure 30 is arranged on the first wall portion 21. The application is described by taking the explosion-proof structure 30 and the first wall portion 21 fixedly connected through laser welding as an example, the laser welding connection can firmly connect the explosion-proof structure 30 and the first wall portion 21 together, not only can better resist external impact and vibration, improve the stability and safety of the battery monomer 200, but also can effectively prevent the explosion-proof structure 30 from loosening or falling off in the use process, and can also realize the sealing of the explosion-proof structure 30 and the first wall portion 21, thereby effectively preventing the medium in the battery monomer 200 from leaking, which is beneficial to improving the safety performance of the battery monomer 200, thereby improving the safety and reliability of the battery monomer 200.

[0069] According to some embodiments of the utility model, as shown in Figures 2-4 The first wall portion 21 is formed with a mounting hole 23 penetrating through the first wall portion 21, and the explosion-proof structure 30 is arranged in the mounting hole 23.

[0070] The first wall portion 21 can be formed with a mounting hole 23 penetrating through the first wall portion 21, since the thickness dimension of the first wall portion 21 is greater than the thickness dimension of the second wall portion 22, a mounting hole 23 with sufficient space can be formed for positioning and mounting the explosion-proof structure 30, which not only provides a stable and reliable basis for the installation of the explosion-proof structure 30, but also enables the shell main body 10 with a relatively thin thickness to meet the installation requirements of the explosion-proof structure 30 without increasing the thickness of the entire mounting wall 20, and enables the explosion-proof structure 30 to be stably mounted on the shell main body 10, and enables the design area of the explosion-proof structure 30 not to be limited by the size of the end cover 12 of the battery monomer 200, which is beneficial to improving the safety performance of the battery monomer 200.

[0071] According to some embodiments of the utility model, as shown in Figure 3 The explosion-proof structure 30 and the mounting cavity 11 are spaced apart, and the end face of the explosion-proof structure 30 away from the mounting cavity 11 is aligned with the end face of the first wall portion 21 away from the mounting cavity 11.

[0072] Among them, as shown in Figure 3As shown, as the first embodiment of the shell 100 of the present application, the explosion-proof structure 30 and the mounting cavity 11 are spaced apart, which can make the explosion-proof structure 30 not in contact with the electrode assembly (i.e. bare battery cell) in the mounting cavity 11, avoiding the possibility of scratching or damaging the electrode assembly when the explosion-proof structure 30 is running or subjected to external force, thereby maintaining the integrity of the electrode assembly. The non-contact design of the explosion-proof structure 30 and the electrode assembly fundamentally eliminates the possibility of direct conduction of the positive and negative electrodes of the electrode assembly, thereby greatly reducing the risk of short circuit of the battery monomer 200, and further greatly reducing the risk of damage, fire and explosion of the battery monomer 200, and improving the safety and reliability of the battery monomer 200.

[0073] And the end face of the explosion-proof structure 30 away from the mounting cavity 11 and the end face of the first wall part 21 away from the mounting cavity 11 are arranged in alignment, and the explosion-proof structure 30 is installed in the mounting hole 23. The end face of the explosion-proof structure 30 away from the mounting cavity 11 and the end face of the first wall part 21 away from the mounting cavity 11 are arranged in alignment, which indicates that the explosion-proof structure 30 is installed in place, which is convenient for determining whether the explosion-proof structure 30 is installed in place, and can make the installation process of the explosion-proof structure 30 more simple and convenient, thereby reducing the installation difficulty and cost of the explosion-proof structure 30, and also reducing the risk of leakage caused by uneven interface or misplacement of the mounting wall 20, and making the explosion-proof structure 30 and the first wall part 21 can more evenly share the load when stressed, thereby enhancing the stability and strength of the entire structure, and also improving the appearance quality of the shell 100.

[0074] According to some embodiments of the present application, as shown in Figure 4 As shown, the inner side wall of the mounting hole 23 forms a supporting boss 24, and the supporting boss 24 is located on the side of the explosion-proof structure 30 facing the mounting cavity 11, and the supporting boss 24 and the explosion-proof structure 30 are in abutment.

[0075] Among them, as shown in Figure 4 As a second embodiment of the shell 100 of the present application, on the basis of the first embodiment of the shell 100, the inner side wall of the mounting hole 23 can also form a supporting boss 24, and the supporting boss 24 is located on the side of the explosion-proof structure 30 facing the mounting cavity 11, and the supporting boss 24 and the explosion-proof structure 30 are in abutment. Specifically, when the explosion-proof structure 30 is installed in the mounting hole 23, the wall surface of the explosion-proof structure 30 facing the mounting cavity 11 is in abutment with the supporting boss 24, so that the supporting boss 24 plays a supporting role on the explosion-proof structure 30, and the supporting boss 24 can effectively disperse and bear the weight or pressure of the explosion-proof structure 30, and also plays a limiting role on the explosion-proof structure 30, thereby avoiding the tendency of the explosion-proof structure 30 to move into the mounting cavity 11 when it falls off the first wall part 21, and further preventing the explosion-proof structure 30 from contacting the electrode assembly in the mounting cavity 11, thereby significantly improving the safety and reliability of the shell 100.

[0076] According to some embodiments of the present application, the support boss 24 can be annular and extend along the circumference of the mounting hole 23, thereby enabling the support boss 24 to provide uniform support force to the circumference of the explosion-proof structure 30, helping to disperse the weight and pressure of the explosion-proof structure 30, preventing local overload and stress concentration, helping to improve the stability and safety of the shell 100, and the annular support boss 24 can provide a continuous sealing surface between the explosion-proof structure 30 and the mounting hole 23, achieving good sealing effect and preventing leakage of the battery monomer 200.

[0077] According to some embodiments of the present application, as shown in Figure 3 The end surface of the support boss 24 facing the mounting cavity 11 is aligned with the end surface of the first wall portion 21 facing the mounting cavity 11, that is, the end surface of the support boss 24 facing the mounting cavity 11 and the end surface of the first wall portion 21 facing the mounting cavity 11 are coplanar, and the support boss 24 and the first wall portion 21 can be integrally formed. By such arrangement, the wall surface of the mounting wall 20 facing the mounting cavity 11 can be prevented from forming an edge, thereby avoiding scratching of the electrode assembly by the edge and providing a safe and reliable installation environment for the electrode assembly. In addition, the support boss 24 and the first wall portion 21 can uniformly bear the pressure or load from the inside or outside of the mounting cavity 11 as a whole, helping to enhance the stability and durability of the mounting wall 20 as a whole, and the inner wall of the mounting cavity 11 can also be neat and orderly.

[0078] According to some embodiments of the present application, the spacing distance between the mounting hole 23 and the edge of the second wall portion 22 is greater than or equal to 3 mm, for example, the spacing distance between the mounting hole 23 and the edge of the second wall portion 22 can be 3 mm, 4 mm, 5 mm, 6 mm, etc., but the present application is not limited thereto, and the spacing distance between the mounting hole 23 and the edge of the second wall portion 22 can also be other values, as long as the spacing distance between the mounting hole 23 and the edge of the second wall portion 22 is greater than or equal to 3 mm. Sufficient spacing distance can reduce the stress concentration phenomenon of the edge of the mounting hole 23, improve the structural strength of the edge of the mounting hole 23, help to improve the overall strength and stability of the shell 100, and also improve the welding effect of the explosion-proof structure 30 and the shell body 10, so that the explosion-proof structure 30 is more reliably arranged on the shell body 10. It should be noted that the upper limit value of the spacing distance between the mounting hole 23 and the edge of the second wall portion 22 can be reasonably selected according to actual conditions.

[0079] According to some embodiments of the utility model, the end face of first wall part 21 facing installation cavity 11 and the end face of second wall part 22 facing installation cavity 11 are aligned, that is to say, the end face of first wall part 21 facing installation cavity 11 and the end face of second wall part 22 facing installation cavity 11 are coplanar, and first wall part 21 and second wall part 22 can be integrally formed, which can avoid the wall surface of installation wall 20 facing installation cavity 11 from forming an edge, and further can avoid the edge from scratching the electrode assembly, provides a safe and reliable installation environment for the electrode assembly, and can also make first wall part 21 and second wall part 22 as a whole uniformly bear the pressure or load from the inside or outside of installation cavity 11, which helps to enhance the stability and durability of installation wall 20 as a whole, and can also make the inner wall of installation cavity 11 neat and orderly.

[0080] According to some embodiments of the utility model, as shown in Figure 4 The thickness of first wall part 21 is D1, and the thickness of second wall part 22 is D2, and 0.2mm≤D1-D2≤1mm.

[0081] The thickness of first wall part 21 can be D1, and the thickness of second wall part 22 can be D2, and the difference between the thickness of first wall part 21 and the thickness of second wall part 22 is D1-D2, and the value of D1-D2 can be 0.2mm, 1mm and any value between 0.2mm and 1mm, for example: the value of D1-D2 can be 0.2mm, 0.51mm, 0.6mm, 1mm and other values, but the utility model is not limited to this, the value of D1-D2 can also be other values between 0.2mm and 1mm, as long as the value of the difference D1-D2 between the thickness of first wall part 21 and the thickness of second wall part 22 satisfies 0.2mm≤D1-D2≤1mm.

[0082] The value of the difference D1-D2 between the thickness of first wall part 21 and the thickness of second wall part 22 satisfies 0.2mm≤D1-D2≤1mm, so that the difference between the thickness of first wall part 21 and the thickness of second wall part 22 is small, which not only can meet the explosion-proof performance by installing explosion-proof structure 30 on first wall part 21 without increasing the overall weight, but also can keep the original shape of shell 100 as much as possible, and further can avoid changing the original assembly mode of shell 100 to reduce the assembly complexity of battery monomer 200.

[0083] According to some embodiments of the utility model, the first wall part 21 and the second wall part 22 can be integrally formed, the integrally formed first wall part 21 and the second wall part 22 make that there is no seam or connecting piece between the first wall part 21 and the second wall part 22, thereby forming a whole force structure, can better resist external impact and vibration, improve the overall strength and rigidity of the shell 100, and the integrally formed design can reduce the stress concentration point of the connecting place, improve the stability and durability of the shell 100, and then can improve the safety and reliability of the battery monomer 200, and can make the inner and outer wall surfaces of the mounting wall 20 are smooth and neat, and then can avoid that the mounting wall 20 is formed with the electrode assembly in the mounting cavity 11 is scratched by the edge and step.

[0084] According to some embodiments of the utility model, the shell main body 10 includes: a side wall and an end wall, the end wall and the end cover 12 are opposite and spaced apart, the side wall is annular and connects the end cover 12 and the end wall, and part of the end wall and / or the side wall is configured as the mounting wall 20.

[0085] The shell main body 10 can include: a side wall and an end wall, the end wall and the end cover 12 are opposite and spaced apart, the side wall is annular and connects the end cover 12 and the end wall, and the annular side wall, the end wall and the end cover 12 jointly define the mounting cavity 11.

[0086] Part of the end wall and / or the side wall is configured as the mounting wall 20, for example: part of the end wall is configured as the mounting wall 20, or part of the side wall is configured as the mounting wall 20, or part of the end wall and part of the side wall are configured as the mounting wall 20, and the application is taken as part of the side wall is configured as the mounting wall 20 as an example for description. Further, the side wall can include a narrow side wall 25 and a wide side wall 26, and the narrow side wall 25 in the side wall can be configured as the mounting wall 20 for mounting the explosion-proof structure 30. Specifically, at least one first wall part 21 is formed on the narrow side wall 25 for mounting the explosion-proof structure 30, and the shape of the mounting hole 23 can be a runway shape, a circular shape or other shapes, which can be reasonably designed according to actual needs, and the shape of the shell 100 can be a rectangular shape, a hexagonal prism shape or other shapes, which can be reasonably set according to actual needs.

[0087] Therefore, there is enough space on the side wall of the shell 100 to set a larger number and larger size of mounting holes 23 for mounting the explosion-proof structure 30, and when the battery monomer 200 is out of control, enough explosion-proof structures 30 can quickly burst and release pressure, and since the explosion-proof structure 30 is located on the shell main body 10, the influence of the high-temperature gas sprayed when the battery monomer 200 is out of control on the wire harness in the battery monomer 200 can be reduced, thereby improving the safety and reliability of the battery monomer 200.

[0088] According to some embodiments of the utility model, as Figures 5-7As shown, the battery monomer 200 further comprises an insulation film 300, which is sleeved on the electrode assembly and located in the mounting cavity 11.

[0089] The insulation film 300 can be made of a polymer material, for example, the insulation film 300 can be made of polypropylene (PP), polyethylene (PE), polyimide (PI) and the like. The polymer material has excellent insulation performance, high temperature resistance and chemical corrosion resistance, and can adapt to the complex environment of the battery monomer 200 during work, thereby ensuring the safety and reliability of the battery monomer 200. The insulation film 300 is sleeved on the electrode assembly and located in the mounting cavity 11, which can separate the electrode assembly from the shell 100 and provide reliable insulation isolation effect, so as to ensure the insulation between the electrode assembly and the shell 100 of the battery monomer 200, prevent the electrode assembly from short circuit, and further ensure the safety and stability of the battery monomer 200.

[0090] According to some embodiments of the present application, Figures 5-7 As shown, the insulation film 300 comprises an insulation film body 301, which is annular to define a mounting space 306 for mounting the electrode assembly, and has a first insulation film wall part 302 corresponding to the welding area of the shell body 10; and a first protective layer 307 arranged on the outer surface of the first insulation film wall part 302.

[0091] The insulation film body 301 is annular to define the mounting space 306 for mounting the electrode assembly of the battery monomer 200, so that the insulation film body 301 can wrap the electrode assembly in all directions, provide reliable insulation isolation effect, ensure the insulation between the electrode assembly and the shell 100 of the battery monomer 200, prevent the electrode assembly from short circuit, and further ensure the safety and stability of the battery monomer 200. Further, the opposite ends of the mounting space 306 can be open.

[0092] The insulating film body 301 has a first insulating film wall part 302 corresponding to the welding area of the shell 100 of the battery monomer 200. Specifically, the shell 100 of the battery monomer 200 can be formed by bending welding, and the welding area of the shell 100 is prone to burrs or welding protrusions on the surface inside the shell 100, which can scratch the insulating film body 301 and cause short circuit of the electrode assembly, so the first insulating film wall part 302 needs to be spaced apart from the welding area to protect the insulating film 300 from being scratched by the burrs or welding protrusions of the welding area of the shell 100. The first protective layer 307 is arranged on the outer surface of the first insulating film wall part 302, which can separate the first insulating film wall part 302 from the welding area of the shell 100, and the first protective layer 307 is arranged between the first insulating film wall part 302 and the welding area of the shell 100, which can reduce the risk of the insulating film 300 being scratched by the burrs or welding protrusions of the welding area of the shell 100, reduce the risk of short circuit of the electrode assembly, and improve the safety and reliability of the battery monomer 200.

[0093] The first protective layer 307 can be a composite wear-resistant coating, which can be silicon carbide, ceramic particles, high molecular wear-resistant material, etc. By brushing or spraying the wear-resistant coating on the outer surface of the first insulating film wall part 302, the welding area can be effectively isolated from the first insulating film wall part 302, the risk of the first insulating film wall part 302 being scratched by the burrs or protrusions of the welding area can be reduced, the wear resistance of the first insulating film wall part 302 can be improved, the safety and reliability of the battery monomer 200 can be improved, and the service life of the battery monomer 200 can be prolonged. Moreover, the first protective layer 307 occupies a small space, and the brushing or spraying operation of the first protective layer 307 is simple, which can reduce the assembly difficulty and manufacturing cost of the battery monomer 200.

[0094] According to some embodiments of the present application, Figure 6As shown, the thickness of the first protective layer 307 is greater than or equal to 0.2mm, for example, the thickness of the first protective layer 307 can be 0.2mm, 0.25mm, 0.3mm, 0.4mm and the like, but the utility model is not limited to this, the thickness of the first protective layer 307 can also be other values, as long as the thickness of the first protective layer 307 is greater than or equal to 0.2mm. The thickness of the first protective layer 307 is greater than or equal to 0.2mm, which can significantly improve the wear resistance of the first protective layer 307, so that the first protective layer 307 can effectively resist the scratching of burrs or protrusions in the welding area, thereby improving the protection effect of the first protective layer 307, which helps to reduce the damage of the first insulation film wall part 302 caused by burrs or protrusions, so as to maintain the insulation performance of the insulation film 300. And the thicker first protective layer 307 can also play a certain buffering role, when the battery monomer 200 is impacted or vibrated, the first protective layer 307 can absorb part of the energy, reduce the impact and damage to the internal electrode assembly of the battery monomer 200, protect the overall structure of the battery monomer 200 from being damaged, thereby further improving the safety and reliability of the battery monomer 200. It should be noted that the upper limit value of the thickness of the first protective layer 307 can be reasonably selected according to the actual situation.

[0095] According to some embodiments of the utility model, as shown in Figure 5 As shown, the insulation film body 301 also has a plurality of second insulation film wall parts 303, the first insulation film wall part 302 and the plurality of second insulation film wall parts 303 are connected in sequence to form a mounting space 306, one of the plurality of second insulation film wall parts 303 forms a first through hole 304, and the first through hole 304 corresponds to the explosion-proof structure 30 on the shell body 10.

[0096] Among them, the insulation film body 301 can also have a plurality of second insulation film wall parts 303, for example, the insulation film body 301 can have three, four, five and the like Number of second insulation film wall parts 303, but the utility model is not limited to this, the insulation film body 301 can also have other number of second insulation film wall parts 303, as long as the insulation film body 301 has a plurality of second insulation film wall parts 303. The application is described by taking the insulation film body 301 having three second insulation film wall parts 303 as an example. But also according to the actual situation, the number of second insulation film wall parts 303 can be reasonably set. The first insulation film wall part 302 and the plurality of second insulation film wall parts 303 are connected in sequence to form a mounting space 306, and the size and shape of the mounting space 306 can be flexibly controlled by adjusting the number of second insulation film wall parts 303, so that the insulation film body 301 adapts to the installation requirements of electrode assemblies of different sizes and shapes.

[0097] One of the plurality of second insulating film wall portions 303 can be formed with a first through hole 304 corresponding to the explosion-proof structure 30 on the shell body 10, which can provide a ventilation space for the explosion-proof structure 30 to explode, ensure that the explosion-proof structure 30 can work normally, so that the explosion-proof structure 30 can release the pressure inside the battery monomer 200 in time, prevent the battery monomer 200 from exploding, and further ensure the safety and reliability of the battery monomer 200.

[0098] According to some embodiments of the present application, as shown in Figure 5 The first through hole 304 can be multiple, for example, there can be two, three, four, etc. The number of first through holes 304, but the present application is not limited to this, there can also be other numbers of first through holes 304, as long as the first through hole 304 is multiple. The plurality of first through holes 304 is used to correspond to the opening of the explosion-proof structure 30 of the shell 100, which can provide a larger gas release channel, so as to more quickly reduce the internal pressure of the battery monomer 200 when the internal pressure of the battery monomer 200 increases to a certain value, prevent explosion or damage caused by excessive pressure, and make the response of the explosion-proof structure 30 more rapid and effective. And the design of the plurality of first through holes 304 provides additional safety redundancy, even if one of the first through holes 304 is blocked, the other first through holes 304 can still work normally, ensuring that the internal pressure of the battery monomer 200 is effectively released, thereby significantly improving the safety and reliability of the battery monomer 200.

[0099] According to some embodiments of the present application, as shown in Figure 5 At least one of the plurality of second insulating film wall portions 303 is formed with a second through hole 305, which is used for electrolyte infiltration.

[0100] Among them, at least one of the plurality of second insulating film wall portions 303 is formed with a second through hole 305, for example, one, two, three, etc. The number of second insulating film wall portions 303 among the plurality of second insulating film wall portions 303 can be formed with a second through hole 305, but the present application is not limited to this, and other numbers of second insulating film wall portions 303 among the plurality of second insulating film wall portions 303 can also be formed with a second through hole 305, as long as at least one of the plurality of second insulating film wall portions 303 is formed with a second through hole 305. The second through hole 305 is used for electrolyte infiltration, and the electrolyte penetrates into the inside of the electrode assembly through the second through hole 305, so that the electrolyte can infiltrate into the electrode assembly and other components inside the battery monomer 200. After the electrolyte infiltrates into the surface of the electrode assembly, a uniform interface that is beneficial to electrochemical reaction can be formed between the electrode assembly and the electrolyte, which helps the ions in the electrolyte to quickly contact and react with the reactants on the surface of the electrode assembly, thereby greatly improving the reaction rate of the electrode assembly, and further improving the performance and service life of the battery monomer 200.

[0101] According to some embodiments of the utility model, as shown in Figure 5 The second insulating film wall part 303 with the first through hole 304 is formed with a second through hole 305 to integrate the first through hole 304 and the second through hole 305 on the same second insulating film wall part 303, which can simplify the structural design of the battery monomer 200, thereby reducing the manufacturing cost of the battery monomer 200, and the first through hole 304 and the second through hole 305 integrated on the same second insulating film wall part 303 are also convenient for maintenance and repair.

[0102] According to some embodiments of the utility model, as shown in Figure 5 One of the plurality of second insulating film wall parts 303 is opposite and spaced apart from the first insulating film wall part 302, and the second insulating film wall part 303 opposite and spaced apart from the first insulating film wall part 302 is formed with the first through hole 304 and the second through hole 305.

[0103] Among them, one of the plurality of second insulating film wall parts 303 is opposite and spaced apart from the first insulating film wall part 302, which can provide support for the electrode assembly, help to maintain the stability of the battery monomer 200, and reasonable spacing design can also reduce the deformation caused by material thermal expansion or internal reaction of the battery monomer 200, thereby prolonging the service life of the battery monomer 200. The second insulating film wall part 303 opposite and spaced apart from the first insulating film wall part 302 is formed with the first through hole 304 and the second through hole 305, which can integrate the first through hole 304 and the second through hole 305 on the same second insulating film wall part 303, further reducing the manufacturing cost and complexity of the battery monomer 200.

[0104] According to some embodiments of the utility model, as shown in Figure 5 The second through hole 305 can be multiple, and the plurality of second through holes 305 are arranged along the length direction of the insulating film 300.

[0105] The second through hole 305 can be multiple, for example, there can be two, three, four or the like number of second through holes 305, but the utility model is not limited thereto, and there can be other numbers of second through holes 305, as long as the second through holes 305 are multiple. The multiple second through holes 305 are arranged along the length direction of the insulating film 300, which can ensure that the electrolyte flows along a definite direction during the infiltration process, reduces the disorder and randomness in the infiltration process, thereby improving the uniformity of the infiltration, helps the electrolyte to be uniformly distributed inside the battery monomer 200, and the uniform electrolyte infiltration helps to form a more stable ion transmission channel, improves the transmission rate of ions in the electrolyte, thereby speeding up the electrochemical reaction process inside the battery monomer 200, and improving the discharge efficiency and power density of the battery monomer 200. The uniform electrolyte infiltration also helps to form a stable and uniform solid electrolyte interface film (SEI film), which can protect the electrode assembly from the corrosion of the electrolyte and improve the cycle stability and safety of the battery monomer 200.

[0106] According to some embodiments of the utility model, as shown in Figure 5 The outer surface of at least one of the two second insulating film wall portions 303 adjacent to the first insulating film wall portion 302 is provided with a first protective layer 307.

[0107] The two second insulating film wall portions 303 adjacent to the first insulating film wall portion 302 are connected with other second insulating film wall portions 303 to form a mounting space 30615 for mounting the electrode assembly of the battery monomer 200.

[0108] The outer surface of at least one of the two second insulating film wall portions 303 adjacent to the first insulating film wall portion 302 is provided with a first protective layer 307, for example, the outer surface of one of the two second insulating film wall portions 303 adjacent to the first insulating film wall portion 302 is provided with a first protective layer 307, or the outer surfaces of the two second insulating film wall portions 303 adjacent to the first insulating film wall portion 302 are both provided with a first protective layer 307, as long as the outer surface of at least one of the two second insulating film wall portions 303 adjacent to the first insulating film wall portion 302 is provided with a first protective layer 307.

[0109] Specifically, when the welding area of the shell body 10 of the battery monomer 200 is located at the corner between two adjacent walls of the shell 100, the burr or welding protrusion of the welding area has the risk of scratching the first and second insulating film wall parts 302 and 303 adjacent to the welding area, the outer surface of the corresponding second insulating film wall part 303 among the two second insulating film wall parts 303 adjacent to the first insulating film wall part 302 is provided with the first protective layer 307, which can increase the protective area of the insulating film 300, reduce the risk of scratching and damaging the corresponding second insulating film wall part 303 by the burr or welding protrusion, further reduce the risk of scratching the insulating film 300 by the burr or welding protrusion of the welding area of the shell 100 of the battery monomer 200, prevent the electrode assembly from short-circuiting, and further improve the safety and reliability of the battery monomer 200.

[0110] According to some embodiments of the present application, as shown in Figures 8-9 The shell body 10 includes a plurality of shell walls 14, part of the shell walls 14 are formed with welding areas 50, the inner side of the shell wall 14 formed with the welding area 50 is provided with a second protective layer 15, the inner side of another part of the shell wall 14 is provided with a first insulating layer 16, and the surface of the second protective layer 15 away from the corresponding shell wall 14 is provided with the first insulating layer 16.

[0111] The shell body 10 can include a plurality of shell walls 14, for example, the shell body 10 can include four shell walls 14. Part of the shell walls 14 are formed with welding areas 50, for example, one shell wall 14 is formed with a welding area 50. The shell wall 14 formed with the welding area 50 can be provided with a second protective layer 15, and the second protective layer 15 can be formed on the inner surface of the shell wall 14. Such arrangement can reasonably position the second protective layer 15, and the second protective layer 15 is arranged between the corresponding shell wall 14 and the electrode assembly, which is conducive to improving the strength of the corresponding shell wall 14 and the smoothness of the inner surface of the corresponding shell wall 14, and reducing the risk of scratching the electrode assembly by the welding seam. As some embodiments of the present application, the second protective layer 15 can be made of high-strength paint, such as super-strong powder material, etc.

[0112] Another part of the shell wall 14, which refers to the shell wall 14 not forming the welding area 50, can be provided with a first insulation layer 16, which is arranged on the inner surface of the other part of the shell wall 14, so that the first insulation layer 16 is arranged between the corresponding shell wall 14 and the electrode assembly, so as to insulate the corresponding shell wall 14 and the electrode assembly. The surface of the second protective layer 15 away from the corresponding shell wall 14 is also provided with the first insulation layer 16, so as to insulate the second protective layer 15 and the electrode assembly, so that the first insulation layer 16 is arranged between the electrode assembly and the corresponding shell wall 14 and between the electrode assembly and the second protective layer 15. The inner surface of the shell wall 14 forming the welding area 50 and the electrode assembly can be sequentially provided with a layer of the second protective layer 15 and a layer of the first insulation layer 16, and the inner surface of the shell wall 14 in other regions and the electrode assembly can be provided with a layer of the first insulation layer 16.

[0113] By arranging the first insulation layer 16 between the electrode assembly and the corresponding shell wall 14 and between the electrode assembly and the second protective layer 15, the risk of short circuit of the electrode assembly can be reliably reduced, the corrosion resistance of the shell body 10 can be improved, the risk of leakage of the battery monomer 200 caused by corrosion of the shell body 10 due to short circuit of the electrode assembly can be reduced, and the use safety and service life of the battery monomer 200 can be improved. It should be noted that the first insulation layer 16 can improve the smoothness of the inner surface of the shell wall 14, which is conducive to reducing the assembly difficulty of the battery monomer 200. As some embodiments of the present application, the first insulation layer 16 can be composed of an insulation material with a medium particle size.

[0114] Specifically, the second protective layer 15 is coated on the inner surface of the shell wall 14 forming the welding area 50, so as to reduce the risk of scratching the electrode assembly by the welding area 50. The first insulation layer 16 is coated on the inner surface of the shell wall 14 except the welding area 50, and the first insulation layer 16 is arranged on the surface of the second protective layer 15 away from the corresponding shell wall 14, so as to improve the smoothness and insulation of the overall inner surface of the shell body 10, thereby smoothly assembling the electrode assembly in the mounting cavity 11 and reducing the assembly difficulty of the battery monomer 200. The battery monomer 200 includes the shell body 10, the second protective layer 15, the first insulation layer 16 and the electrode assembly, without other insulation or protective components, and is simple to assemble. In addition, the volume of the second protective layer 15 and the first insulation layer 16 can be reduced, so that the mounting cavity 11 for assembling the electrode assembly is larger, thereby being conducive to improving the energy density of the battery monomer 200.

[0115] As some embodiments of the present application, the second protective layer 15 has the characteristics of resistance to electrolyte corrosion and super-high hardness, and can play the role of flattening the weld and improving the strength of the welding area 50. The second protective layer 15 is composed of solute and solvent, wherein the solute is a super-hard powder material with a particle size of ≤10 μm, including but not limited to diamond-like carbon (DLC), cubic boron nitride (cBN), nitrogen carbide (C3N4), etc. The hardness of the second protective layer 15 is ≥3H, the voltage resistance is ≥4000DC, the adhesion is ≥0 level, the shear strength is ≥10MPa, and the surface roughness RA is between 0.2 microns and 0.4 microns.

[0116] As some embodiments of the present application, the first insulation layer 16 has the characteristics of resistance to electrolyte corrosion and insulation. The first insulation layer 16 is composed of solute and solvent, wherein the particle size of the solute is 30-80 μm, including but not limited to polytetrafluoroethylene, polyethylene, chlorovinyl copolymer resin, polyvinyl butyral, vinylidene chloride, perchloroethylene, chlorosulfonated polyethylene, etc. The surface roughness RA of the first insulation layer 16 is between 0.1 microns and 1 microns, the insulation impedance is ≥0.5GΩ (under the test conditions of DC 1000V5S), and the thermal conductivity is ≥0.2W / (mk).

[0117] It should be noted that the coating method of the second protective layer 15 and the first insulation layer 16 can be but is not limited to gas deposition technology (PVD), powder electrostatic spraying, UV spraying, UV printing, etc.

[0118] The shell body 10 of the present application is verified in actual production, and the verification results are as follows:

[0119] Example 1: For a two-end opening shell body 10 with a size of 600*100*10, the thickness of the second protective layer 15 is set to 0.15mm, and the thickness of the first insulation layer 16 is set to 0.008mm. And 100 battery cells (i.e. battery monomers 200) are trial-produced with the shell body 10.

[0120] Example 2: For a two-end opening shell body 10 with a size of 600*100*10, the thickness of the second protective layer 15 is set to 0.15mm, and the thickness of the first insulation layer 16 is set to 0.005mm, and 100 battery cells are trial-produced with the shell body 10.

[0121] Comparative Example 1: For a two-end opening shell body 10 with a size of 600*100*10, only one layer of insulation coating is provided on the weld side, and the thickness is set to 0.008mm, and 100 battery cells are trial-produced with the shell body 10.

[0122] Comparative Example 2: For the two-end-opened shell body 10 with the size of 600*100*10, no coating treatment is performed on the inner surface of the aluminum shell, the pp insulation film 300 with the thickness of 0.1mm is wrapped outside the electrode assembly, then the electrode assembly is put into the shell, and the shell body 10 is used to trial-produce 100 battery cells 100.

[0123] The comparison results are shown in the following table:

[0124] Indicator Surface roughness / μm Insulation resistance / GΩ Hardness Shear strength / Moa Yield of trial production of battery cell in this process Reference standard ISO 25178 DC 1000V 5S GB / T 6739-2006 ISO 4587 / Example 1 0.4 μm 1.2 5H 30 100％ Example 2 0.4 μm 1.1 5H 30 100％ Comparative Example 1 0.8 μm 1 3H 10 97％ Comparative Example 2 1 μm 0 (not insulated) / / 95％

[0125] According to the comparison table, the application can effectively improve the trial production yield of the battery cell 200.

[0126] Therefore, by providing the second protective layer 15 on the inner surface of the shell wall 14 forming the welding area 50, the smoothness of the inner surface of the shell and the strength of the shell can be improved, the electrode assembly assembled in the shell body 10 is protected from being scratched by the welding seam, and by providing the first insulation layer 16 on the inner surface of the other part of the shell wall 14 and the surface of the second protective layer 15 away from the corresponding shell wall 14, the corrosion resistance of the shell body 10 can be improved, the risk of liquid leakage of the battery cell 200 caused by corrosion of the shell body 10 can be reduced, and the use safety and service life of the battery cell 200 can be improved.

[0127] According to some embodiments of the application, as shown in Figure 9 The structural strength of the second protective layer 15 is greater than that of the first insulation layer 16.

[0128] The second protective layer 15 plays a role in flattening the welding seam and improving the strength of the welding area 50, and the first insulation layer 16 plays an insulation role, so the structural strength of the second protective layer 15 is greater than that of the first insulation layer 16. Such arrangement can reasonably arrange the second protective layer 15 and the first insulation layer 16, the insulation performance of the first insulation layer 16 is independent of the strength of the first insulation layer 16, and the first insulation layer 16 with smaller strength can achieve insulation effect. The structural strength of the second protective layer 15 is conducive to reliably protecting the electrode assembly and reducing the risk of the welding seam piercing the second protective layer 15, thereby reducing the risk of the welding seam scratching the electrode assembly.

[0129] Further, since the welding area 50 of the shell body 10 is formed by split welding, the structural strength is lower than that of other parts of the shell body 10, and the structural strength of the second protective layer 15 is greater, which can reliably improve the strength of the welding area 50 and reduce the risk of deformation or even cracking of the welding area 50 caused by stress of the battery cell 200, thereby reducing the risk of liquid leakage of the battery cell 200 from the welding area 50 and improving the service life of the battery cell 200.

[0130] According to some embodiments of the application, as shown in Figure 9 The thickness of the second protective layer 15 is greater than that of the first insulation layer 16.

[0131] The second protective layer 15 plays a role of leveling the weld and improving the strength of the welding area 50, and the first insulating layer 16 plays a role of insulation, so the thickness of the second protective layer 15 is greater than the thickness of the first insulating layer 16, and the reasonable arrangement of the second protective layer 15 and the first insulating layer 16 can be realized, the thickness of the first insulating layer 16 is small, the insulation role can be realized, and the occupation of the first insulating layer 16 to the installation cavity 11 is reduced, and the volume energy density of the battery monomer 200 is improved.

[0132] The thickness of the second protective layer 15 is greater, which is beneficial to reliably protecting the electrode assembly and reducing the risk of the weld piercing the second protective layer 15, thereby reducing the risk of the weld scratching the electrode assembly. Further, since the welding area 50 of the shell body 10 is formed by split welding, the structural strength is lower than other parts of the shell body 10, and the thickness of the second protective layer 15 can reliably improve the strength of the welding area 50, reduce the risk of the welding area 50 deforming or even cracking caused by the stress of the battery monomer 200, thereby reducing the risk of the battery monomer 200 leaking from the welding area 50, and improving the service life of the battery monomer 200.

[0133] According to some embodiments of the present application, as shown in Figure 9 The thickness of the second protective layer 15 is H1, and the relationship formula is 0.05mm≤H1≤0.5mm.

[0134] The thickness H1 of the second protective layer 15 can satisfy the relationship formula 0.05mm≤H1≤0.5mm, that is, the thickness H1 of the second protective layer 15 can be set to any value between 0.05mm and 0.5mm, for example, the thickness H1 of the second protective layer 15 can be set to 0.05mm, 0.15mm or 0.5mm, but the present application is not limited to this, the thickness H1 of the second protective layer 15 can also be set to other values, as long as the thickness H1 of the second protective layer 15 can satisfy the relationship formula 0.05mm≤H1≤0.5mm.

[0135] The thickness H1 of the second protective layer 15 is set to 0.15mm, which can reasonably set the thickness of the second protective layer 15, and is beneficial to reliably protecting the electrode assembly, reducing the risk of the weld piercing the second protective layer 15 caused by the second protective layer 15 being too thin, thereby reducing the risk of the weld scratching the electrode assembly, and also reducing the risk of increasing the production cost of the battery monomer 200 caused by the second protective layer 15 being too thick, which is beneficial to the low-cost design of the battery monomer 200.

[0136] According to some embodiments of the present application, as shown in Figure 9As shown, the thickness of the first insulation layer 16 is H2, and the relationship 0.02mm≤H2≤0.2mm is satisfied.

[0137] The thickness H2 of the first insulation layer 16 can satisfy the relationship 0.02mm≤H2≤0.2mm, that is, the thickness H2 of the first insulation layer 16 can be set to any value between 0.02mm and 0.2mm, for example, the thickness H2 of the first insulation layer 16 can be set to 0.02mm, 0.08mm or 0.2mm, but the application is not limited to this, the thickness H2 of the first insulation layer 16 can also be set to other values, as long as the thickness H2 of the first insulation layer 16 can satisfy the relationship 0.02mm≤H2≤0.2mm.

[0138] The application takes the thickness H2 of the first insulation layer 16 as an example to be set to 0.08mm, which can reasonably set the thickness of the first insulation layer 16, and is conducive to the reliable protection of the electrode assembly by the first insulation layer 16, reduces the risk of insulation failure of the first insulation layer 16 due to the first insulation layer 16 being too thin, and also reduces the risk of increasing the production cost of the battery monomer 200 due to the first insulation layer 16 being too thick, which is conducive to the low-cost design of the battery monomer 200.

[0139] According to some embodiments of the application, the first insulation layer 16 arranged on the other part of the shell wall 14 and the first insulation layer 16 arranged on the second protective layer 15 are integrally formed.

[0140] The first insulation layer 16 arranged on the other part of the shell wall 14 and the first insulation layer 16 arranged on the second protective layer 15 are integrally formed, that is, all the first insulation layers 16 of the battery monomer 200 are integrally formed, which can process the first insulation layer 16 arranged on the other part of the shell wall 14 and the first insulation layer 16 arranged on the second protective layer 15 through one process, which is conducive to improving the production efficiency of the shell 100 and the battery monomer 200, and by integrally forming the first insulation layer 16 arranged on the other part of the shell wall 14 and the first insulation layer 16 arranged on the second protective layer 15, the risk of having a gap between the first insulation layer 16 arranged on the other part of the shell wall 14 and the first insulation layer 16 arranged on the second protective layer 15 can be reduced, thereby improving the insulation performance of the first insulation layer 16.

[0141] According to some embodiments of the application, as shown in Figure 8 The thickness of the first insulation layer 16 arranged on the other part of the shell wall 14 is equal to the thickness of the first insulation layer 16 arranged on the second protective layer 15.

[0142] The thickness of the first insulation layer 16 arranged on the other part of the shell wall 14 is equal to the thickness of the first insulation layer 16 arranged on the second protective layer 15, which can improve the thickness uniformity of the first insulation layer 16, thereby improving the uniformity of the insulation effect of the first insulation layer 16, reducing the risk of a gap at the joint of the first insulation layer 16 arranged on the other part of the shell wall 14 and the first insulation layer 16 arranged on the second protective layer 15 due to the non-uniform thickness of the first insulation layer 16, thereby improving the insulation performance of the first insulation layer 16, and also reducing the risk of increased assembly difficulty of the electrode assembly due to the non-uniform thickness of the first insulation layer 16, thereby improving the assembly efficiency of the battery monomer 200.

[0143] According to some embodiments of the present application, as shown in Figure 8 The surface roughness of the first insulation layer 16 is Ra, and the relationship is 0.μm≤Ra≤1μm.

[0144] The surface roughness of the first insulation layer 16 is Ra, and the relationship is 0.μm≤Ra≤1μm. That is, the surface roughness of the first insulation layer 16 can be set to any value between 0.μm and 1μm, for example, the surface roughness of the first insulation layer 16 can be set to 0.μm, 0.5μm or 1μm, but the present application is not limited thereto, and the surface roughness of the first insulation layer 16 can also be set to other values, as long as the surface roughness of the first insulation layer 16 can satisfy the relationship 0.μm≤Ra≤1μm.

[0145] The surface roughness of the first insulation layer 16 is set to 0.5μm, which can reasonably set the surface roughness of the first insulation layer 16, which is conducive to improving the smoothness of the inner surface of the main body of the shell 100, reducing the risk of increased assembly difficulty of the electrode assembly due to the roughness of the first insulation layer 16, thereby improving the assembly efficiency of the battery monomer 200, and also reducing the risk of increased production cost of the battery monomer 200 due to the excessively high roughness requirement of the first insulation layer 16, which is conducive to the low-cost design of the battery monomer 200.

[0146] According to some embodiments of the present application, as shown in Figure 9 The plurality of shell walls 14 are sequentially connected at the head and tail to form an annular structure.

[0147] As some embodiments of the present application, the shell wall 14 can be provided as four. The four shell walls 14 are sequentially connected head to tail to form a ring structure, so that the four shell walls 14 and the two end covers 12 collectively surround the mounting cavity 11, which can provide an assembly position for the electrode assembly, so that the electrode assembly can be assembled in the main body of the shell 100. By assembling the electrode assembly from the open end of the ring structure into the mounting cavity 11, the assembly difficulty of the electrode assembly can be reduced, thereby realizing the effect of smoothly assembling the electrode assembly in the main body of the shell 100. It is beneficial to reliable work of the electrode assembly in the mounting cavity 11, reduces the interference of the external environment on the electrode assembly, thereby improving the service life of the battery monomer 200.

[0148] According to some embodiments of the present application, as shown in Figure 13 As an example of the present application, the second insulating layer 17 can be insulating paint, and the second insulating layer 17 can also be insulating glue, but the present application is not limited thereto. The second insulating layer 17 can also be other insulating structures as long as it has an insulating effect. The inner surface of the shell main body 10 is provided with the second insulating layer 17, which can prevent the electrode assembly of the battery monomer 200 from contacting the shell main body 10, reduce the risk of short circuit of the battery monomer 200, and also reduce the interaction between the inside and the outside environment of the battery monomer 200, thereby improving the stability and reliability of the battery monomer 200.

[0149] According to some embodiments of the present application, as shown in Figure 13 The thickness of the second insulating layer 17 is D3, and 0mm < D3 ≤ 0.3mm. For example, the thickness D3 of the second insulating layer 17 can be 0.1mm, 0.11mm, 0.12mm, 0.2mm, 0.3mm, etc. However, the present application is not limited thereto. The thickness D3 of the second insulating layer 17 can also be other values between 0mm and 3mm, as long as the thickness D3 of the second insulating layer 17 satisfies 0mm < D3 ≤ 0.3mm. The thickness D3 of the second insulating layer 17 is set in the reasonable range of 0mm-0.3mm, so that the second insulating layer 17 can effectively separate the electrode assembly and the shell 100, reduce the risk of current communication, and the reasonable thickness of the second insulating layer 17 can also increase the mechanical strength of the shell 100, thereby reducing the risk of deformation or rupture of the battery monomer 200 when subjected to external force impact or extrusion, so that the safety, stability, reliability and service life of the battery monomer 200 are significantly improved.

[0150] According to some embodiments of the present application, as shown in Figures 10-12As shown, the battery monomer 200 can further include a fixing support 40 and a plastic part 41, both of which are arranged in the mounting cavity 11, the plastic part 41 is located between the end cover 12 and the fixing support 40, the electrode assembly is located on the side of the fixing support 40 away from the end cover 12, and the side of the fixing support 40 facing the end cover 12 is formed with a mounting groove 42, and at least part of the plastic part 41 is assembled in the mounting groove 42.

[0151] The plastic part 41 as a sealing and insulating part of the battery monomer 200 can reduce the risk of external moisture, dust and other impurities entering the shell 100, thereby prolonging the service life and reliability of the battery monomer 200, and the plastic part 41 also has heat resistance and cold resistance, which can effectively manage heat during charging and discharging of the battery monomer 200, help to maintain the optimal working temperature range of the battery monomer 200, thereby improving the energy efficiency and cycle life of the battery monomer 200. The plastic part 41 can also act as a barrier to reduce the risk of fire spreading or explosion when the battery monomer 200 overheats or short circuits, thereby improving the safety performance of the battery monomer 200.

[0152] The fixing support 40 can include a first support 401 and a second support 402, the first support 401 and the second support 402 can have the same structure, and the first support 401 and the second support 402 are fixedly connected, for example, the first support 401 and the second support 402 can be fixedly connected by bolts, or the first support 401 and the second support 402 can be fixedly connected by clamping, but the utility model is not limited thereto, the first support 401 and the second support 402 can also be fixedly connected by other ways, as long as the first support 401 and the second support 402 are fixedly connected. As an example of the present application, the first support 401 and the second support 402 are fixedly connected by clamping. Specifically, the first support 401 can be formed with a first clamping hole 403, the second support 402 can be formed with a second clamping hole corresponding to the first clamping hole 403, and a buckle 404 can be clamped in the first clamping hole 403 and the second clamping hole to fixedly connect the first support 401 and the second support 402. The clamping fixed connection can realize quick connection of the first support 401 and the second support 402, greatly improving the assembly efficiency of the fixing support 40, and the clamping fixed connection has high fastening force, and the connection part is not easy to loosen after clamping and fixing, thereby improving the stability and reliability of the connection between the first support 401 and the second support 402.

[0153] The fixing support 40 and the plastic part 41 are arranged in the mounting cavity 11, the plastic part 41 is located between the end cover 12 and the fixing support 40, the electrode assembly is located on the side of the fixing support 40 away from the end cover 12, the side of the fixing support 40 facing the end cover 12 is formed with a mounting groove 42, and at least part of the plastic part 41 is assembled in the mounting groove 42. Specifically, the first support 401 can be formed with a first mounting groove 421, the second support 402 can be formed with a second mounting groove 422, and after the first support 401 is fixedly connected with the second support 402, the first mounting groove 421 and the second mounting groove 422 are combined into the mounting groove 42 for mounting the plastic part 41. At least part of the plastic part 41 is assembled in the mounting groove 42, for example, one-half, one-third or other proportion of the plastic part 41 can be assembled in the mounting groove 42, but the utility model is not limited thereto, and other proportion of the plastic part 41 can also be assembled in the mounting groove 42, as long as at least part of the plastic part 41 is assembled in the mounting groove 42.

[0154] Further, as shown in Figure 11 The distance between the bottom surface of the mounting groove 42 facing the end cover 12 and the end surface of the fixing support 40 facing the end cover 12 can be D4, and D4 is greater than or equal to 0.5 mm, for example, the distance D4 between the bottom surface of the mounting groove 42 facing the end cover 12 and the end surface of the fixing support 40 facing the end cover 12 can be 0.5 mm, 0.6 mm, 0.7 mm or the like, in other words, the depth dimension of the mounting groove 42 can be D4, and D4 is greater than or equal to 0.5 mm, but the utility model is not limited thereto, and the distance between the end surface of the mounting groove 42 facing the end cover 12 and the end surface of the fixing support 40 facing the end cover 12 can also be other values, as long as the distance D4 between the end surface of the mounting groove 42 facing the end cover 12 and the end surface of the fixing support 40 facing the end cover 12 is greater than or equal to 0.5 mm, it can be explained that the upper limit value of the distance between the bottom surface of the mounting groove 42 facing the end cover 12 and the end surface of the fixing support 40 facing the end cover 12 can be reasonably designed according to the actual situation.

[0155] The plastic part 41 is located between the end cover 12 and the fixing support 40, and at least part of the plastic part 41 is assembled in the mounting groove 42, compared with the existing assembly mode that the plastic part 41 and the fixing support 40 are assembled through clamping, the assembly difficulty of the electrode assembly can be reduced, and at least part of the plastic part 41 is assembled in the mounting groove 42, which can make the structure of the plastic part 41 and the fixing support 40 compact, is conducive to saving the internal space of the battery monomer 200, a larger volume electrode assembly can be arranged in the battery monomer 200, so that the energy density of the battery monomer 200 can be improved.

[0156] According to some embodiments of the utility model, as shown in Figure 1 and Figure 2As shown, the shell body 10 is annular and has opposite first and second open mouths, the end cover 12 is two, and the two end covers 12 are respectively arranged at the first and second open mouths, and the fixed support 40 and the plastic piece 41 are both two, the two fixed supports 40 are opposite and spaced apart along the arrangement direction of the two end covers 12, the electrode assembly is assembled between the two fixed supports 40, and the two plastic pieces 41 are respectively arranged between the corresponding end cover 12 and the fixed support 40.

[0157] As shown, the shell body 10 is annular and has opposite first and second open mouths, the end cover 12 is two, and the two end covers 12 are respectively arranged at the first and second open mouths, and the fixed support 40 and the plastic piece 41 are both two, the two fixed supports 40 are opposite and spaced apart along the arrangement direction of the two end covers 12, the electrode assembly is assembled between the two fixed supports 40, and the two plastic pieces 41 are respectively arranged between the corresponding end cover 12 and the fixed support 40.

[0158] According to the battery pack of the embodiment of the utility model, the battery monomer 200 of the above-mentioned embodiment can reduce the interference between the information acquisition piece and other parts, can improve the space utilization, can facilitate the installation and positioning of the information acquisition piece, can reduce the risk of damaging the end cover 12 when the boss structure 13 is connected with the information acquisition piece, can make the design area of the explosion-proof structure 30 not limited by the size of the cover plate of the battery monomer 200, can improve the safety performance of the battery monomer 200, can make the shell body 10 with a relatively small thickness meet the installation requirements of the explosion-proof structure 30, can stably install the explosion-proof structure 30 on the shell body 10, can reduce the influence of the high-temperature gas sprayed out of the battery monomer 200 on the wire harness in the battery monomer 200 when the battery monomer 200 is out of control, can reduce the risk of scratching the insulating film 300 by the burrs or welding protrusions of the welding area of the shell 100 of the battery monomer 200, can reduce the risk of short circuit of the battery monomer 200, and can improve the safety and reliability of the battery pack.

[0159] According to the power utilization device, the battery pack of the above embodiment can reduce the interference between the information acquisition member and other parts, improve the space utilization, facilitate the installation and positioning of the information acquisition member, reduce the risk of damaging the end cover 12 when the boss structure 13 is connected with the information acquisition member, and make the design area of the explosion-proof structure 30 not limited by the size of the cover plate of the battery monomer 200, which is beneficial to improving the safety performance of the battery monomer 200, and can make the shell main body 10 with a relatively small thickness meet the installation requirement of the explosion-proof structure 30, and make the explosion-proof structure 30 stably installed on the shell main body 10, and can reduce the influence of the high-temperature gas sprayed out of the battery monomer 200 when the battery monomer 200 is out of control on the wire harness in the battery monomer 200, and can reduce the risk of the insulating film 300 being scratched by burrs or welding protrusions of the welding area of the shell 100 of the battery monomer 200, so as to reduce the short circuit risk of the battery monomer 200, and further improve the safety and reliability of the power utilization device.

[0160] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0161] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell (200) characterized by, The shell (100) comprises an end cover (12) and a shell body (10) fixedly connected to jointly define a mounting cavity (11), and an electrode assembly arranged in the mounting cavity (11); an outer surface of the end cover (12) facing away from the mounting cavity (11) is formed with a boss structure (13) protruding from the end cover (12), and the boss structure (13) is used for connecting an information acquisition member. Further comprising:

2. The battery cell (200) according to claim 1, characterized in that An explosion-proof structure (30) arranged in the shell body (10). The shell body (10) has a mounting wall (20) comprising a first wall portion (21) and a second wall portion (22), the thickness of the first wall portion (21) is greater than that of the second wall portion (22), the second wall portion (22) is arranged around the first wall portion (21), and the explosion-proof structure (30) is arranged in the first wall portion (21).

3. The battery cell (200) according to claim 2, characterized in that The first wall portion (21) is formed with a mounting hole (23) penetrating through the first wall portion (21), and the explosion-proof structure (30) is arranged in the mounting hole (23).

4. The battery cell (200) according to claim 3, characterized in that The explosion-proof structure (30) and the mounting cavity (11) are spaced apart, and an end surface of the explosion-proof structure (30) facing away from the mounting cavity (11) is aligned with an end surface of the first wall portion (21) facing away from the mounting cavity (11).

5. The battery cell (200) according to claim 3, characterized in that An inner side wall of the mounting hole (23) is formed with a support boss (24) located on a side of the explosion-proof structure (30) facing the mounting cavity (11), and the support boss (24) and the explosion-proof structure (30) are in abutment.

6. The battery cell (200) according to claim 4, characterized in that The distance between the mounting hole (23) and the edge of the second wall portion (22) is greater than or equal to 3 mm.

7. The battery cell (200) of claim 4, wherein, The thickness of the first wall portion (21) is D1, and the thickness of the second wall portion (22) is D2, and 0.2 mm≤D1-D2≤1 mm.

8. The battery cell (200) according to claim 3, characterized in that Further comprising:

9. The battery cell (200) of claim 1, wherein, An insulating film (300) sleeved on the electrode assembly and located in the mounting cavity (11). The insulating film (300) comprises:

10. The battery cell (200) according to claim 9, characterized in that An insulating film body (301) in the shape of a ring to define a mounting space (306) for mounting the electrode assembly, the insulating film body (301) having a first insulating film wall portion (302) corresponding to a welding area (50) of the shell body (10); A first protective layer (307) arranged on an outer surface of the first insulating film wall portion (302). The thickness of the first protective layer (307) is greater than or equal to 0.2 mm.

11. The battery cell (200) according to claim 10, characterized in that ​ 12. The battery cell (200) according to claim 10, characterized in that The insulating film body (301) further has a plurality of second insulating film wall portions (303), the first insulating film wall portion (302) and the plurality of second insulating film wall portions (303) are sequentially connected in order to form the mounting space (306), one of the plurality of second insulating film wall portions (303) is formed with a first through hole (304), and the first through hole (304) corresponds to the explosion-proof structure (30) on the shell body (10).

13. The battery cell (200) according to claim 12, characterized in that At least one of the plurality of second insulating film wall portions (303) is formed with a second through hole (305) for electrolyte infiltration.

14. The battery cell (200) according to claim 13, characterized in that The second insulating film wall portion (303) formed with the first through hole (304) is formed with the second through hole (305).

15. The battery cell (200) of claim 13, wherein, One of the plurality of second insulating film wall portions (303) is opposite and spaced apart from the first insulating film wall portion (302), and the second insulating film wall portion (303) opposite and spaced apart from the first insulating film wall portion (302) is formed with the first through hole (304) and the second through hole (305).

16. The battery cell (200) of claim 1, wherein, The shell body (10) includes a plurality of shell walls (14), part of the shell walls (14) are formed with a welding area (50), the inner side of the shell wall (14) formed with the welding area (50) is provided with a second protective layer (15), the inner side of another part of the shell wall (14) is provided with a first insulating layer (16), and the second protective layer (15) is provided with the first insulating layer (16) away from the surface of the corresponding shell wall (14).

17. The battery cell (200) according to claim 16, characterized in that The structural strength of the second protective layer (15) is greater than the structural strength of the first insulating layer (16).

18. The battery cell (200) of claim 16, wherein, The thickness of the second protective layer (15) is greater than the thickness of the first insulating layer (16).

19. The battery cell (200) of claim 16, wherein, The first insulating layer (16) provided on the other part of the shell wall (14) and the first insulating layer (16) provided on the second protective layer (15) are integrally formed.

20. The battery cell (200) of claim 1, wherein, The inner surface of the shell body (10) is provided with a second insulating layer.

21. The battery cell (200) according to claim 20, characterized in that The thickness of the second insulating layer is D3, 0mm < D3 ≤ 0.3mm.

22. The battery cell (200) according to any one of claims 1-21, characterized by, Further comprising: A fixing support (40) and a plastic part (41), the fixing support (40) and the plastic part (41) are both arranged in the mounting cavity (11), the plastic part (41) is located between the end cover (12) and the fixing support (40), the electrode assembly is located on the side of the fixing support (40) away from the end cover (12), the side of the fixing support (40) facing the end cover (12) is formed with a mounting groove (42), and at least part of the plastic part (41) is assembled in the mounting groove (42).

23. The battery cell (200) according to claim 22, characterized in that The shell body (10) is annular and has opposite first and second open mouths, the end covers (12) are two, the two end covers (12) are respectively arranged at the first and second open mouths, the fixing supports (40) and the plastic parts (41) are both two, the two fixing supports (40) are opposite and spaced apart along the arrangement direction of the two end covers (12), and the electrode assembly is assembled between the two fixing supports (40), and the two plastic parts (41) are respectively arranged between the corresponding end cover (12) and the fixing support (40).

24. A battery pack, characterized by A battery pack comprising the battery cell (200) according to any one of claims 1-23.

25. An electrical device, comprising: A battery pack comprising the battery pack according to claim 24.

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