A battery

Abstract

The application discloses a battery, which comprises a shell, a battery cell assembly, an isolating piece and a top cover assembly. The shell has a containing cavity. The battery cell assembly is arranged in the containing cavity and comprises a bare battery cell and an insulating sheet wrapped outside the bare battery cell. The bare battery cell has a body part, which has a top end face, a bottom end face and a circumferential surface connected to the top end face and the bottom end face. The insulating sheet wraps the circumferential surface and / or the bottom end face. The isolating piece is arranged in the shell and is used for separating the bottom end face of the bare battery cell from the bottom surface of the shell. The top cover assembly is sealingly connected with the shell and is used for closing the opening of the shell. The top cover assembly is arranged in a spaced mode with the insulating sheet. The bottom end face of the bare battery cell is arranged in a spaced mode with the bottom surface of the shell through the isolating piece, so that the bare battery cell can be prevented from colliding with the round corner of the shell, the electrical stability of the bare battery cell is protected, the insulation and anti-collision protection of the bare battery cell are realized, and the service life of the battery is prolonged.

Description

TECHNICAL FIELD

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

[0002] In today's society, electric energy has become an indispensable energy in life, and the generation and storage of electric energy are getting more and more attention. Especially for the storage of electric energy, the electric energy that cannot be completely consumed is stored by the battery to realize the continuous supply of electric energy when the power system fails.

[0003] In the related art battery, the bare battery cell is usually installed in the accommodating cavity of the shell, but during the process of installing the bare battery cell in the accommodating cavity of the shell and during the movement of the battery, the bare battery cell may collide with the shell, causing the structure of the bare battery cell to be damaged, thereby affecting the stability of the electrical performance of the battery, and in severe cases, the battery may not be used. SUMMARY

[0004] The battery disclosed by the embodiment of the present application realizes insulation and anti-collision protection of the bare battery cell, and improves the service life of the battery.

[0005] In order to achieve the above-mentioned purpose, the present application discloses a battery, which comprises:

[0006] A shell having an open accommodating cavity;

[0007] An electric cell assembly arranged in the accommodating cavity, the electric cell assembly comprising a bare battery cell and an insulating sheet wrapped outside the bare battery cell, the bare battery cell having a body portion with a top end face, a bottom end face located at both ends of the body portion, and a peripheral surface connected to the top end face and the bottom end face, and the insulating sheet wrapping the peripheral surface and / or the bottom end face;

[0008] A partition arranged in the shell for separating the bottom end face of the bare battery cell from the bottom surface of the shell;

[0009] A top cover assembly sealingly connected with the shell for closing the opening of the shell, and the top cover assembly is arranged in a spaced manner with the insulating sheet.

[0010] As an optional embodiment, in the embodiment of the present application, an air flow channel is formed between the insulating sheet and the top cover assembly.

[0011] As an optional implementation, in the embodiment of the present application, the insulating sheet comprises a circumferential covering region, the circumferential covering region covers the circumferential surface of the body part, and the spacer is integrally formed on the insulating sheet and serves as a bottom covering region of the insulating sheet, the bottom covering region covers the bottom end surface of the body part.

[0012] As an optional implementation, in the embodiment of the present application, the spacer is an insulating sheet material parallel to the bottom end surface, and the thickness of the insulating sheet material is 0.1mm-2mm.

[0013] As an optional implementation, in the embodiment of the present application, at least one surface of the spacer is provided with a protruding structure.

[0014] As an optional implementation, in the embodiment of the present application, the insulating sheet comprises a circumferential covering region and a bottom covering region, the circumferential covering region covers the circumferential surface of the body part, the bottom covering region covers the bottom end surface of the body part, and the spacer is arranged on the side of the bottom covering region away from the body part.

[0015] As an optional implementation, in the embodiment of the present application, the spacer is arranged parallel to the side of the bottom covering region away from the body part.

[0016] As an optional implementation, in the embodiment of the present application, the thickness sum of the spacer and the bottom covering region is 0.1mm-2mm.

[0017] As an optional implementation, in the embodiment of the present application, the spacer and the bottom covering region are provided with corresponding positioning holes for positioning.

[0018] As an optional implementation, in the embodiment of the present application, the spacer is provided with two first positioning holes, the bottom covering region is provided with two second positioning holes, and the two first positioning holes are arranged at two ends of the spacer and on the same center line.

[0019] As an optional implementation, in the embodiment of the present application, the spacer is further provided with an anti-sticking hole, and the anti-sticking hole deviates from the center line of the spacer.

[0020] As an optional implementation, in the embodiment of the present application, the spacer and the bottom covering region are connected by a hot melt method.

[0021] As an optional implementation, in the embodiment of the present application, the spacer and the bottom covering region are made of the same material by a hot plastic process.

[0022] As an optional implementation, in the embodiment of the application, a liquid guiding channel is arranged on the insulating sheet, and the liquid guiding channel guides the electrolyte between the bare battery cell and the insulating sheet to the space between the insulating sheet and the shell.

[0023] As an optional implementation, in the embodiment of the application, the battery further comprises a tape arranged in the circumferential wrapping region or between the circumferential wrapping region and the bottom wrapping region, so that the circumferential wrapping region and the bottom wrapping region enclose a cavity for wrapping the bare battery cell, and the tape is located outside the cavity.

[0024] As an optional implementation, in the embodiment of the application, the surfaces of the circumferential wrapping region and the bottom wrapping region of the insulating sheet, which face the bare battery cell, are not provided with a glue layer.

[0025] As an optional implementation, in the embodiment of the application, the distance between the insulating piece and the bare battery cell satisfies:

[0026] L1+3mm≤L2≤L1+6mm;

[0027] W1+3mm≤W2≤W1+6mm;

[0028] wherein L1 is the length of the bare battery cell, and W1 is the width of the bare battery cell;

[0029] L2 is the length of the insulating piece, and W2 is the width of the insulating piece.

[0030] Compared with the prior art, the application has the following advantages:

[0031] The battery provided by the embodiment of the application comprises a shell having a receiving cavity and a battery cell assembly arranged in the receiving cavity, the battery cell assembly further comprises a bare battery cell and an insulating sheet wrapped outside the bare battery cell, and the battery realizes insulation protection of the bare battery cell through the wrapping of the insulating sheet. Meanwhile, an insulating piece is arranged between the bottom end surface of the bare battery cell and the bottom surface of the shell. In the process of machining the shell, the edges and corners of the bottom surface of the shell are designed as rounded corners. When the bare battery cell is directly placed in the receiving cavity of the shell, the bottom end surface of the bare battery cell is spaced apart from the bottom surface of the shell through the arrangement of the insulating piece, so that the bottom end surface of the bare battery cell is spaced apart from the rounded corners of the bottom surface of the shell, the collision between the bare battery cell and the rounded corners of the shell is effectively prevented, the active substance inside the bare battery cell is prevented from falling off, the short circuit of the bare battery cell is avoided, and the normal use of the battery is effectively ensured.

[0032] Further, the battery realizes the closing of the opening of the housing accommodating cavity through the top cover assembly, and the top cover assembly is spaced apart from the insulating sheet, so as to prevent the insulating sheet from being interfered with the top cover assembly during the welding of the top cover assembly and the housing, and the edge curling of the insulating sheet, and the deformation of the insulating sheet; meanwhile, when the insulating sheet is spaced apart from the top cover assembly, the space between the insulating sheet and the bare battery cell and the space between the housing and the insulating sheet are communicated, so that the gas in the housing can flow in the housing, and the heat dissipation function of the bare battery cell can be improved, the pressure difference between the inside of the housing and the outside can be reduced, and the safety of the battery can be improved; in addition, during the use of the battery, the bare battery cell generates gas, and since the space between the housing and the insulating sheet is communicated with the space between the insulating sheet and the bare battery cell, the gas generated by the bare battery cell can flow to the space between the insulating sheet and the housing, and the stamping force of the gas generated by the bare battery cell on the insulating sheet can be reduced, and the safety of the battery can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 A perspective view of the battery provided in the present embodiment;

[0035] Figure 2 A sectional view of A in Figure 1

[0036] Figure 3 An enlarged view of B in Figure 2

[0037] Figure 4 A sectional view of A in another structure of Figure 1

[0038] Figure 5 An enlarged view of C in Figure 4

[0039] Figure 6 An exploded view of the battery provided in the present embodiment;

[0040] Figure 7 A structural view of the bare battery cell provided in the present embodiment;

[0041] Figure 8 A perspective view of the insulating sheet and the spacer provided in the present embodiment; ​​​​

[0042] Figure 9a An expanded structure schematic view of the first insulating sheet structure provided in the embodiment;

[0043] Figure 9b An expanded structure schematic view of the second insulating sheet structure provided in the embodiment;

[0044] Figure 9c An expanded structure schematic view of the third insulating sheet structure provided in the embodiment;

[0045] Figure 9d An expanded structure schematic view of the fourth insulating sheet structure provided in the embodiment;

[0046] Figure 9e An expanded structure schematic view of the fifth insulating sheet structure provided in the embodiment;

[0047] Figure 9f An expanded structure schematic view of the sixth insulating sheet structure provided in the embodiment;

[0048] Figure 10 A perspective structure schematic view of the insulating sheet provided in the embodiment;

[0049] Figure 11 A perspective structure schematic view of the insulating sheet and the top cover assembly provided in the embodiment;

[0050] Figure 12 A perspective structure schematic view of the insulating sheet and the top cover assembly provided in the embodiment; Figure 11 An enlarged view of C of

[0051] Figure 13 A perspective structure schematic view of the insulating sheet and the top cover assembly provided in the embodiment;

[0052] Figure 14 An enlarged view of D of Figure 13

[0053] Icon:

[0054] ​10, housing; 11, bottom surface; 12, rounded corner; 20, battery cell assembly; 21, bare battery cell; 211, body part; 212, top end surface; 213, bottom end surface; 214, first side surface; 215, second side surface; 22, insulation sheet; 221, circumferential wrapping area; 2211, first wrapping area; 2212, second wrapping area; 221a, first side wing; 221b, second side wing; 221c, third side wing; 221d, fourth side wing; 221e, first bending area; 221f, second bending area; 221g, third bending area; 221h, fourth bending area; 2213, second hot melt connection position; 222, bottom wrapping area; 2221, fourth hot melt connection position; 2222, second positioning hole; 223, liquid guide channel; 224, top surface; 30, adhesive tape; 40, top cover assembly; 41, top cover plate; 42, lower plastic; 421, connecting boss; 42a, first hot melt connection position; 50, spacer; 51, first surface; 511, third hot melt connection position; 512, first positioning hole; 52, corner; 100, battery. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0056] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used for better description of the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0057] In addition, the above-mentioned partial terms may be used to represent other meanings in addition to the orientation or positional relationship, for example, the term "upper" may also be used to represent a certain dependent relationship or connection relationship in some cases. For a person of ordinary skill in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0058] In addition, the terms "mounting", "arrangement", "provided with", "connected", "linked" should be understood broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal connection between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

[0059] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific type and structure can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0060] The technical solutions of the present application will be further described below in conjunction with the embodiments and the drawings.

[0061] Please refer to Figures 1 to 3 The battery 100 disclosed in the embodiments of the present application comprises a shell 10 having a receiving cavity and a cell assembly 20, the cell assembly 20 is arranged in the receiving cavity, the cell assembly 20 comprises a bare cell 21 and an insulating sheet 22, the insulating sheet 22 is wrapped on the outer side of the bare cell 21 to realize insulation protection of the bare cell 21, the bare cell 21 has a body part 211, the body part 211 has a top end face 212 and a bottom end face 213 which are respectively located at two ends of the body part 211, and a circumferential surface connected to the top end face 212 and the bottom end face 213, the insulating sheet 22 can be wrapped on the circumferential surface of the body part 211 of the bare cell 21, or wrapped on the bottom end face 213 of the body part 211 of the bare cell 21, or wrapped on both the circumferential surface and the bottom end face 213 of the body part 211 of the bare cell 21, so as to improve the insulation protection effect of the insulating sheet 22.

[0062] During the processing of the shell 10, the corners of the bottom surface 11 of the shell 10 are designed as rounded corners 12. When the bare cell 21 is directly placed in the receiving cavity of the shell 10, if the bare cell 21 directly contacts the shell 10, the contact between the bare cell 21 and the rounded corner 12 at the position of the rounded corner 12 of the shell 10 is linear contact, which will cause the part of the bare cell 21 contacting the rounded corner 12 of the shell 10 to bear a large pressure, and further cause the active material inside the bare cell 21 to fall off, so that the positive and negative sheets inside the bare cell 21 are short-circuited, the bare cell 21 cannot realize normal charging and discharging functions, the battery is electrically invalid, and even a danger can occur.

[0063] Based on the above reasons, as Figures 3 to 5As shown, the bottom end surface 213 of the bare battery cell 21 and the bottom surface 11 of the shell 10 are spaced apart by the spacer 50. By spacing apart the bottom end surface 213 of the bare battery cell 21 and the bottom surface 11 of the shell 10, the bottom end surface 213 of the bare battery cell 21 can be spaced apart from the fillet 12 of the bottom surface 11 of the shell 10, effectively preventing the bare battery cell 21 from colliding with the fillet 12 of the shell 10, avoiding the active material inside the bare battery cell 21 from falling off and causing the bare battery cell 21 to short circuit.

[0064] In combination Figure 6 , Figure 7 As shown, it can be understood that the body part 211 of the bare battery cell 21 can be a square block, with a length dimension L1, a width dimension W1, and a height dimension H1, and the bare battery cell 21 can form a cuboid structure with a length L1, a width W1, and a height H1. Designing the bare battery cell 21 as a simple and regular three-dimensional shape can facilitate subsequent packaging and protection of the bare battery cell 21, and simplify the overall structural design of the battery 100.

[0065] Specifically, the peripheral surface of the bare battery cell 21 includes two first side surfaces 214 along the width direction thereof, and two second side surfaces 215 along the length direction thereof. During the installation of the bare battery cell 21, the insulating sheet 22 can wrap the two first side surfaces 214, the two second side surfaces 215, and the bottom end surface 213 of the bottom surface 11, to achieve insulation protection of the bare battery cell 21.

[0066] Please refer again to Figure 2 , Figure 3 , Figure 6 and Figure 7 In an optional embodiment, the insulating sheet 22 includes a circumferential wrapping region 221 wrapping the peripheral surface of the body part 211 of the bare battery cell 21, and the spacer 50 is integrally formed with the insulating sheet 22 and serves as a bottom wrapping region of the insulating sheet 22 wrapping the bottom end surface 213 of the body part 211 of the bare battery cell 21. When the spacer 50 is integrally formed with the insulating sheet 22, the connection strength between the insulating sheet 22 and the spacer 50 can be improved, and the distance between the bottom end surface 213 of the bare battery cell 21 and the bottom surface 11 of the shell 10 can be reduced, which can further reduce the internal space of the shell 10 and improve the energy density of the battery 100.

[0067] In this embodiment, the spacer 50 is arranged parallel to the bottom end surface 213 of the bare battery cell 21 to achieve stable bearing of the bare battery cell 21, and the spacer 50 is made of insulating material to achieve insulation protection of the bare battery cell 21. Considering the limited internal space of the shell 10 of the battery 100, and in order to further improve the utilization efficiency of the internal space of the shell 10 of the battery 100, the spacer 50 is in a sheet structure to achieve the spacer 50 bearing the bare battery cell 21 while reducing the occupancy of the internal space of the shell 10, thereby improving the energy density of the battery 100.

[0068] Further, considering the isolation effect of the spacer 50 on the bottom end surface 213 of the bare battery cell 21 and the bottom surface 11 of the shell 10, the thickness H of the spacer 50 is 0.1mm to 2mm, i.e. the thickness H of the spacer 50 can be 0.1mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc. At the same time, since the round corner 12 of the bottom surface 11 of the shell 10 has a certain size, when the distance between the bottom end surface 213 of the bare battery cell 21 and the bottom surface 11 of the shell 10 is less than 0.1mm, interference will occur between the bare battery cell 21 and the round corner 12 of the bottom surface 11 of the shell 10, which will greatly increase the possibility of active material falling inside the bare battery cell 21, and will seriously affect the electrical performance stability of the bare battery cell 21. When the distance between the bottom end surface 213 of the bare battery cell 21 and the bottom surface 11 of the shell 10 is greater than 2mm, the cell assembly 20 will occupy a larger space in the accommodation cavity of the shell 10, which will cause the overall size of the battery to increase, affect the structural design of the battery, and reduce the energy density of the battery.

[0069] Optionally, as Figure 6 , Figure 8As shown, the spacer 50 is provided with the protruding structure 514 on at least one surface of the spacer 50. Specifically, the spacer 50 has a first surface 51 and a second surface 52. The first surface 51 is a surface of the spacer 50 facing the bare battery cell 21, and the second surface 52 is a surface of the spacer 50 facing the housing 10. In one example, the protruding structure 514 is provided on the first surface 51. By providing the protruding structure 514 on the first surface 51 of the spacer 50, the friction between the spacer 50 and the bare battery cell 21 can be increased, so that the bare battery cell 21 is more stably fixed on the spacer 50 and is less likely to slide, thereby preventing the bare battery cell 21 from colliding with the housing 10. In another example, the protruding structure 514 is provided on the second surface 52. By providing the protruding structure 514 on the second surface 52 of the spacer 50, the friction between the spacer 50 and the bottom surface 11 can be increased, so that the spacer 50 is more stably fixed on the bottom surface 11 and is less likely to slide, thereby preventing the bare battery cell 21 from colliding with the housing 10. In yet another example, the protruding structure 514 is provided on both the first surface 51 and the second surface 52. By providing the protruding structure 514 on at least one surface of the spacer 50, the stability of the spacer 50 can be improved, and the bare battery cell 21 is less likely to collide with the housing 10.

[0070] In addition, by providing the protruding structure 514 on at least one surface of the spacer 50, the manufacturing difficulty of the spacer 50 can be reduced. When the surface of the spacer 50 is too smooth, the two spacers 50 placed on top of each other are likely to stick together and are difficult to separate, which requires a long time to separate the spacers 50 during the manufacturing process, thereby seriously affecting the production efficiency.

[0071] Specifically, the protruding structure 514 can be a boss, a bump, a protruding strip, or other structures that can protrude from the surface of the spacer 50, which is not specifically limited in the present embodiment.

[0072] For reference, Figure 4 , Figure 5 , Figure 6 and Figure 7In another alternative embodiment, the insulating sheet 22 has a circumferential covering area 221 and a bottom covering area 222, the circumferential covering area 221 covers the circumferential surface of the body part 211, and the bottom covering area 222 covers the bottom end surface 213 of the body part 211. The insulating sheet 22 fully covers the bare battery cell 21 except for the top end surface 212 of the bare battery cell 21 through the circumferential covering area 221 and the bottom covering area 222, so as to improve the insulation protection of the insulating sheet 22. At this time, the isolating piece 50 is separately provided from the insulating sheet 22, and the isolating piece 50 is arranged on the side surface of the bottom covering area 222 of the insulating sheet 22 away from the body part 211. When the isolating piece 50 is separately provided from the insulating sheet 22, the insulating sheet 22 can be designed as a sheet structure with the same overall thickness. At this time, the manufacturing difficulty of the isolating piece 50 and the insulating sheet 22 can be reduced, that is, the isolating piece 50 and the insulating sheet 22 can be respectively produced, so as to effectively improve the production efficiency of the insulating sheet 22 and the isolating piece 50. In addition, the isolating piece 50 and the insulating sheet 22 can be respectively designed in structure, further reducing the difficulty of structural design when being integrally formed.

[0073] Further, in order to realize the bearing stability of the isolating piece 50 to the bare battery cell 21, the isolating piece 50 is arranged in parallel with the side surface of the bottom covering area 222 of the insulating sheet 22 away from the body part 211, so as to realize the fixing stability of the isolating piece 50, the insulating sheet 22 and the bare battery cell 21, and prevent the bare battery cell 21 and the insulating sheet 22 from sliding off the isolating piece 50. Through parallel arrangement, the force borne by the isolating piece 50 can be more uniform, so as to prevent the isolating piece 50 from being broken or damaged due to uneven force, and further affect the service life of the battery 100.

[0074] When the isolating piece 50 is separately provided from the insulating sheet 22, the sum H of the thickness of the bottom covering area 222 of the insulating sheet 22 and the thickness of the isolating piece 50 is 0.1mm to 2mm, that is, the sum H of the thickness of the bottom covering area 222 of the insulating sheet 22 and the thickness of the isolating piece 50 can be 0.1mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc. At the same time, since the round corner 12 of the bottom surface 11 of the shell 10 has a certain size, when the distance between the bottom end surface 213 of the bare battery cell 21 and the bottom surface 11 of the shell 10 is less than 0.1mm, interference will inevitably occur between the bare battery cell 21 and the round corner 12 of the bottom surface 11 of the shell 10, which will greatly increase the possibility of dropping of the active material inside the bare battery cell 21, and will seriously affect the electrical performance stability of the bare battery cell 21. When the distance between the bottom end surface 213 of the bare battery cell 21 and the bottom surface 11 of the shell 10 is greater than 2mm, the battery cell assembly 20 will occupy a larger space in the accommodating cavity of the shell 10, which will cause the overall size of the battery to be larger, affect the structural design of the battery, and reduce the energy density of the battery.

[0075] Further, considering that the spacer 50 needs to support the bare battery cell 21, and the insulating sheet 22 only needs to achieve insulation protection of the bare battery cell 21, and the influence of the stress characteristics of the spacer 50 and the insulating sheet 22 on the structural strength thereof, the thickness of the spacer 50 can be greater than or equal to the thickness of the insulating sheet 22, or the thickness of the spacer 50 is twice the thickness of the insulating sheet 22, or the thickness of the spacer 50 can be three times the thickness of the insulating sheet 22, etc., so that the spacer 50 can better support the bare battery cell 21 when subjected to impact from the outside, to achieve the buffering and shock-absorbing effect of the spacer 50 on the bare battery cell 21.

[0076] Specifically, the thickness of the insulating sheet 22 can be 0.1mm-1mm. When the thickness of the insulating sheet 22 is too small, the strength of the insulating sheet 22 cannot be guaranteed and it is easy to be damaged; when the thickness of the insulating sheet 22 is too large, the portability of the secondary battery 100 cannot be achieved, and at the same time, the shell 10 needs to have a larger accommodating cavity to accommodate the bare battery cell 21 and the insulating sheet 22, thereby leading to a larger size of the secondary battery 100.

[0077] The thickness of the spacer 50 can be 0.1mm-2mm. When the thickness of the spacer 50 is too small, the bearing strength of the spacer 50 cannot be guaranteed and it is easy to be damaged; when the thickness of the spacer 50 is too large, the portability of the secondary battery 100 cannot be achieved, and at the same time, the thicker spacer 50 needs the shell 10 to have a larger accommodating cavity to accommodate the spacer 50, thereby leading to a larger size of the secondary battery 100.

[0078] Considering the thickness relationship and thickness range of the spacer 50 and the insulating sheet 22, the thickness relationship between the insulating sheet 22 and the spacer 50 is as follows:

[0079] When the thickness of the insulating sheet 22 is 0.15mm, the thickness of the spacer 50 can be 0.30mm or 0.45mm, etc.; when the thickness of the insulating sheet 22 is 0.5mm, the thickness of the spacer 50 can be 1.0mm or 1.5mm, etc.; when the thickness of the insulating sheet 22 is 1.0mm, the thickness of the spacer 50 can be 2.0mm.

[0080] It can be understood that the thickness of the spacer 50 and the insulating sheet 22 described above is only some examples, and in actual application, as long as the thickness of the insulating sheet 22 and the spacer 50 satisfies the above thickness range, the specific thickness value is not limited in the embodiment.

[0081] Specifically, when the isolation piece 50 is provided separately from the insulating sheet 22, the isolation piece 50 is connected to the side of the bottom covering area 222 of the insulating sheet 22 away from the bare battery cell 21. By providing the isolation piece 50 between the bare battery cell 21 and the bottom surface 11 of the shell 10, the bare battery cell 21 is supported by the isolation piece 50. When the shell 10 is impacted by external impact, the impact from the shell 10 can be buffered and damped by the isolation piece 50, reducing the impact of external impact on the bare battery cell 21, thereby better protecting the bare battery cell 21 and preventing the bare battery cell 21 from shedding active material when impacted, thereby preventing internal short circuit.

[0082] Since the structure inside the battery 100 needs to insulate and protect the bare battery cell 21, the insulating sheet 22 and the isolation piece 50 are both made of insulating material and are made by thermoplastic process. The insulating sheet 22 and the isolation piece 50 made by thermoplastic process have high toughness and good impact resistance. For example, the insulating sheet 22 and the isolation piece 50 are usually made of high molecular insulating material, for example, the isolation piece 50 can be made of polypropylene, polyethylene, etc., and the insulating sheet 22 can be made of polypropylene, polyethylene, etc.

[0083] Further, when the connection between the insulating sheet 22 and the isolation piece 50 fails, the isolation piece 50 will move relative to the insulating sheet 22. At this time, the insulating sheet 22 will be subjected to friction from the isolation piece 50, causing the insulating sheet 22 to be damaged by friction and thus unable to provide good insulation protection to the bare battery cell 21. Therefore, in order to achieve stable connection between the isolation piece 50 and the insulating sheet 22, the insulating sheet 22 and the isolation piece 50 can be connected by hot melting. The surface of the isolation piece 50 connected to the insulating sheet 22 is the first surface 51, and the first surface 51 has a third hot melting connection position 511. The bottom covering area 222 of the bottom surface 11 of the insulating sheet 22 has a fourth hot melting connection position 2221. When the isolation piece 50 and the insulating sheet 22 are hot melted, the third hot melting connection position 511 and the fourth hot melting connection position 2221 can be hot melted to achieve stable connection between the insulating sheet 22 and the isolation piece 50, thereby achieving good insulation protection of the bare battery cell 21 by the insulating sheet 22.

[0084] Further, in order to further improve the connection stability of the hot melting connection between the isolation piece 50 and the insulating sheet 22, the isolation piece 50 and the insulating sheet 22 are selected to be the same material. When the isolation piece 50 and the insulating sheet 22 are the same high molecular material, the molecular structures of the isolation piece 50 and the insulating sheet 22 are the same, and they can have strong bonding force when hot melted. This can make the connection between the isolation piece 50 and the insulating sheet 22 more stable, further preventing the relative movement between the isolation piece 50 and the insulating sheet 22, thereby preventing damage to the insulating sheet 22 and reducing the performance stability of the battery 100, or even making the battery 100 unusable.

[0085] Optionally, the isolation piece 50 and the insulation sheet 22 are both made of polypropylene material. Since polypropylene material is a high-molecular insulating material, the isolation piece 50 and the insulation sheet 22 are selected to be made of the material to achieve insulation protection for the bare battery cell 21. In addition, since polypropylene material is not stretchable, it is easy to form a single-layer film structure, and when the isolation piece 50 and the insulation sheet 22 are selected to be made of the material, they have stronger carrying capacity and are not easy to be damaged, thereby improving the service life of the battery 100. It can be understood that in other embodiments, the materials of the isolation piece 50 and the insulation sheet 22 can also be selected to be polyethylene or other high-molecular insulating materials, and the specific materials can be selected according to actual conditions, and the present embodiment is not limited in particular.

[0086] Please refer to Figure 8 In some embodiments, in order to achieve the accuracy of the connection position between the isolation piece 50 and the insulation sheet 22, corresponding positioning holes can be arranged at the bottom covering area 222 of the isolation piece 50 and the insulation sheet 22. Specifically, two first positioning holes 512 arranged at intervals can be arranged on the first surface 51 (the surface connected with the insulation sheet 22) of the isolation piece 50. The two first positioning holes are located at both ends of the isolation piece and on the same center line. In actual arrangement, the centers of the two first positioning holes 512 are located on the central axis of the first surface 51 along the length direction (i.e. the X direction in Figure 8 When the first positioning holes 512 are arranged on the central axis of the first surface 51, the center of the isolation piece 50 can be opposite to the center of the insulation sheet 22, preventing the insulation sheet 22 and the bare battery cell 21 from being eccentrically arranged on the isolation piece 50, thereby causing uneven stress on the carrying capacity of the isolation piece 50 and causing local deformation or even damage of the isolation piece 50, and failing to achieve the buffering and shock-absorbing effect on the bare battery cell 21.

[0087] Further, the distance between the two first positioning holes 512 should be not less than half of the size of the first surface 51 along the length direction, i.e. half of the length L2 of the isolation piece 50. This is because the greater the distance between the two first positioning holes 512, the smaller the straight line error determined by the two first positioning holes 512, and the more accurate the positioning accuracy of the first positioning hole 512. Therefore, the distance between the two first positioning holes 512 should be not less than half of the length of the isolation piece 50.

[0088] Further, in order to ensure the bearing strength of the spacer 50, the diameter of the first positioning hole 512 should be no greater than 3 mm, for example, it can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. Regardless of whether the first positioning hole 512 is a blind hole or a through hole, due to the presence of the first positioning hole 512, the material thickness of the spacer 50 at the position of the first positioning hole 512 is smaller than that of other positions without opening structure, so that the bearing capacity of the spacer 50 at the position of the first positioning hole 512 is reduced, and therefore the diameter of the first positioning hole 512 cannot be too large.

[0089] In some embodiments, considering that the spacer 50 needs to be heat fused with the insulating sheet 22, the position of the first positioning hole 512 can avoid the third heat fusion position 511 of the spacer 50, so as to avoid the situation that the first positioning hole 512 is not easy to identify due to being blocked by the third heat fusion position 511.

[0090] It can be understood that in other embodiments, the position of the first positioning hole 512 can also be arranged at the third heat fusion position 511 of the spacer 50, and then the relative position between the spacer 50 and the insulating sheet 22 is determined, and then heat fusion is performed. The first positioning hole 512 can be filled with material by heat fusion to enhance the bearing strength of the spacer 50.

[0091] Correspondingly, as shown in Figure 8 Since the first surface 51 of the spacer 50 is connected with the bottom covering area 222 of the bottom surface 11 of the insulating sheet 22, two second positioning holes 2222 with the same position and diameter as the two first positioning holes 512 are arranged on the bottom surface 11 of the bottom covering area 222, and the centers of the two second positioning holes 2222 are arranged on the central axis of the bottom surface 11 in the length direction (i.e. the X direction in Figure 8 The distance between the two second positioning holes 2222 should be the same as the distance between the two first positioning holes 512, that is, when the spacer 50 and the insulating sheet 22 are correctly connected, the first positioning hole 512 and the second positioning hole 2222 can completely coincide.

[0092] It can be understood that the first positioning hole 512 and the second positioning hole 2222 can both be through holes, and when both of them are through holes, the electrolyte can circulate through the positioning holes, which can improve the infiltration degree of the electrolyte.

[0093] In some embodiments, considering that the isolation piece 50 is to be hot melt connected with the insulation sheet 22, the position of the second positioning hole 2222 can avoid the fourth hot melt connection position 2221 of the insulation sheet 22, thereby avoiding that the second positioning hole 2222 is not easily identified due to the second positioning hole 2222 being blocked by the fourth hot melt connection position 2221.

[0094] It can be understood that in other embodiments, the position of the second positioning hole 2222 can be set at the fourth hot melt connection position 2221 of the insulation sheet 22, and then the hot melt connection is performed after the relative position of the isolation piece 50 and the insulation sheet 22 is determined. The second positioning hole 2222 can be filled with material by hot melt connection to enhance the carrying strength of the insulation sheet 22.

[0095] Referring to Figure 8 In some embodiments, the isolation piece 50 further comprises a foolproof structure, and the foolproof structure can effectively prevent the isolation piece from being installed incorrectly. Specifically, the foolproof structure can be a foolproof hole 513, which is offset from the center line of the isolation piece 50 to achieve the foolproof function of the foolproof hole 513; and the foolproof hole 513 is a through hole, and the immersion effect of the electrolyte can be improved by setting the foolproof hole 513 as a through hole.

[0096] In combination with Figure 6 As shown in In some embodiments, since the accommodation cavity of the shell 10 is a square cavity, and the four corners of the accommodation cavity are rounded corners 12, when the isolation piece 50 is placed inside the accommodation cavity of the shell 10, in order to achieve the close fit between the isolation piece 50 and the shell 10, the isolation piece 50 is designed as a rectangular sheet structure, and the four corners 52 of the isolation piece 50 are designed as rounded corner structures to achieve the close fit between the isolation piece 50 and the shell 10. If the four corners 52 of the isolation piece 50 are right angle structures, the edge of the isolation piece 50 is in line contact with the shell 10, and at this time the force of the shell 10 on the isolation piece 50 is concentrated at the corner 52 position of the isolation piece 50, which causes the corner 52 position of the isolation piece 50 to be easily damaged. Therefore, in this embodiment, when the four corners 52 of the isolation piece 50 are designed as rounded corners, the isolation piece 50 and the shell 10 can be in surface contact, and the isolation piece 50 can uniformly disperse the force from the shell 10 to each position of the isolation piece 50, thereby reducing the pressure on the corner 52 and ensuring the structural strength of the isolation piece 50.

[0097] Referring again to Figure 7 , Figure 8 Further, in order to achieve the carrying effect of the isolation piece 50 on the bare battery cell 21, the size of the isolation piece 50 and the size of the bare battery cell 21 should satisfy:

[0098] L2 = L1 ± 5mm;

[0099] W2 = W1 ± 5mm;

[0100] Wherein, L2 is the length of the isolation piece 5030, and W2 is the width of the isolation piece 5030.

[0101] As can be seen from the foregoing, L1 is the length of the bare cell 21, and W1 is the width of the bare cell 21, i.e. the length L2 of the isolation piece 50 can be L1 + 5mm, L1 + 4.6mm, L1 + 3mm, etc., and the width W2 of the isolation piece 50 can be W1 + 6mm, W1 + 5mm, W1 + 3mm, etc. It can be understood that the above-mentioned length and width of the isolation piece 50 are only some examples, and in the actual design process, as long as the size of the isolation piece 50 and the size of the bare cell 21 satisfy the above-mentioned relationship, it is acceptable, and in the present embodiment, it is not specifically limited.

[0102] Considering that the insulating sheet 22 is mainly used to cover the outside of the bare cell 21, therefore, the way of covering the outside of the bare cell 21 by the insulating sheet 22 will be introduced in detail below in combination with the drawings.

[0103] Some embodiments, please refer to Figure 9a 、 Figure 9b 、 Figure 9c 、 Figure 9d 、 Figure 9e 、 Figure 9f , the circumferential covering area 221 of the insulating sheet 22 includes a first covering area 2211 and a second covering area 2212, and the first covering area 2211 and the second covering area 2212 are respectively connected to the two sides of the bottom covering area 222. The insulating sheet 22 is enclosed through the first covering area 2211 and the second covering area 2212, forming a cavity for covering the bare cell 21, and realizing the overall covering of the circumferential surface of the bare cell 21.

[0104] An example, as Figure 9aAs shown, the first cladding area 2211 and the second cladding area 2212 are provided with side wings on both sides, and the first cladding area 2211 and the second cladding area 2212 are cladded to the first side surface 214 of the bare battery cell 21, and the side wings are cladded to the second side surface 215 of the bare battery cell 21. Specifically, the first cladding area 2211 is provided with a first side wing 221a and a second side wing 221b on both sides respectively, the first side wing 221a and the second side wing 221b are the same in shape and size, the second cladding area 2212 is provided with a third side wing 221c and a fourth side wing 221d on both sides respectively, the third side wing 221c and the fourth side wing 221d are the same in shape and size, when the insulating sheet 22 forms a cavity cladded to the bare battery cell 21, the first side wing 221a and the second side wing 221b are folded towards the second side surface 215 of the bare battery cell 21 respectively, and the third side wing 221c and the fourth side wing 221d are also folded towards the second side surface 215 of the bare battery cell 21, so that the first side wing 221a is connected with the third side wing 221c, and the second side wing 221b is connected with the fourth side wing 221d, so as to realize cladding of the second side surface 215 of the bare battery cell 21 by the first side wing 221a, the second side wing 221b, the third side wing 221c and the fourth side wing 221d.

[0105] Further, when the second side surface 215 of the bare battery cell 21 is cladded by the side wings, as shown in the structure of the insulating sheet 22 in Figure 9a The connection form of the first side wing 221a and the third side wing 221c can be that the edges of the first side wing 221a and the third side wing 221c are just spliced, and completely cover the second side surface 215 of the bare battery cell 21, at this time, full coverage of the bare battery cell 21 can be realized under the condition of minimum area of the insulating sheet 22, so as to reduce the consumption of insulating sheet 22 material and save the manufacturing cost of the battery.

[0106] Or as shown in the structure of the insulating sheet 22 in Figure 9b The connection form of the first side wing 221a and the third side wing 221c can be that the first side wing 221a and the third side wing 221c at least partially overlap, that is, the edge of the first side wing 221a can be lapped on the third side wing 221c, at this time, due to the overlapping part between the first side wing 221a and the third side wing 221c, the connection part of the first side wing 221a and the third side wing 221c can be more closely connected, and the overlapping connection can thicken the material thickness of the connection part, which can further strengthen the structural strength of the connection part, and can effectively prevent the insulating sheet 22 from being damaged.

[0107] It can be understood that, no matter whether the first side wing 221a and the third side wing 221c are in the form of edge connection or in the form of partial overlap connection, the sizes of the first side wing 221a and the third side wing 221c can be the same or different, as long as the above connection forms can be realized. In the embodiment, the relative size between the first side wing 221a and the third side wing 221c is not specifically limited.

[0108] Since the second side wing 221b and the first side wing 221a have the same structural size, and the third side wing 221c and the fourth side wing 221d have the same structural size, the connection form of the second side wing 221b and the fourth side wing 221d can refer to the connection form of the first side wing 221a and the third side wing 221c, which will not be described here.

[0109] In the above scheme, the case that the first side wing 221a and the second side wing 221b have the same size and shape, and the third side wing 221c and the fourth side wing 221d have the same size is provided. Considering that the structure of the bare battery cell 21 is roughly a square block structure, when the sizes of the first side wing 221a and the second side wing 221b are different, and the sizes of the third side wing 221c and the fourth side wing 221d are different, as long as the full cladding of the bare battery cell 21 can be realized, the size relationship between the first side wing 221a and the second side wing 221b and the size relationship between the third side wing 221c and the fourth side wing 221d are not specifically limited here.

[0110] Further, as in the structure of the insulating sheet 22 in Figure 9a and Figure 9b , a first bending area 221e is arranged between the first side wing 221a and the first cladding area 2211, a second bending area 221f is arranged between the second side wing 221b and the first cladding area 2211, a third bending area 221g is arranged between the third side wing 221c and the second cladding area 2212, and a fourth bending area 221h is arranged between the fourth side wing 221d and the second cladding area 2212. When the insulating sheet 22 forms a cavity for cladding the bare battery cell 21, the first bending area 221e, the second bending area 221f, the third bending area 221g, and the fourth bending area 221h can form four rounded corners 12 of the circumferential cladding area 221, that is, through the arrangement of the above bending areas, the side wing can be more easily bent relative to the cladding area, and the insulating sheet 22 can more easily form a cladding cavity.

[0111] The formation of the bending area can be formed by marking an indentation on the insulating sheet 22, and one bending area can be formed between every two indentations. Through the method of marking the indentation, the insulating sheet 22 can be more easily bent at the indentation position, so as to more easily form a cladding cavity.

[0112] It is understood that the bending area can also be formed by integral molding during the molding of the insulating sheet 22, or by other means, that is, no specific limitation is made in this embodiment.

[0113] In another example, such as Figure 9c The insulating sheet 22 in the middle has a structure in which side wings are provided on one side of the first covering area 2211 and the second covering area 2212. The first covering area 2211 and the second covering area 2212 cover the first side 214 of the bare cell 21, and the side wings cover the second side 215 of the bare cell 21. Specifically, a first side wing 221a is provided on one side of the first covering area 2211, and a second side wing 221b is provided on the other side of the second covering area 2212 opposite to the first side wing 221a. When the insulating sheet 22 forms a cavity covering the bare battery cell 21, the first side wing 221a folds toward the second side surface 215 of the bare battery cell 21, and the second side wing 221b also folds toward the second side surface 215 of the bare battery cell 21, so that the first side wing 221a is connected to the side of the second covering area 2212 without a side wing, and the second side wing 221b is connected to the side of the first covering area 2211 without a side wing, so that the second side surface 215 of the bare battery cell 21 is covered by the first side wing 221a and the second side wing 221b.

[0114] Furthermore, when the second side 215 of the bare cell 21 is covered by the side wings, as shown in the structure of the insulating sheet 22 in Figure 9c, the connection between the first side wing 221a and the side of the second covering area 2212 without side wings can be such that the edge of the first side wing 221a just meets the edge of the side of the second covering area 2212 without side wings, completely covering the second side 215 of the bare cell 21. In this case, full coverage of the bare cell 21 can be achieved with the smallest possible area of ​​the insulating sheet 22, reducing the consumption of insulating sheet 22 material and saving battery manufacturing costs. Alternatively, as... Figure 9d The insulating sheet 22 in the structure can be connected in such a way that the first side wing 221a and the side of the second covering area 2212 without side wings at least partially overlap. That is, the edge of the first side wing 221a can overlap the second covering area 2212. In this case, because there is an overlap between the first side wing 221a and the second covering area 2212, the connection between the first side wing 221a and the second covering area 2212 can be tighter. At the same time, the overlapping connection can thicken the connection part.

[0115] Since the two second sides 215 of the bare battery cell 21 have the same structural size, the connection form of the second side wing 221b to the first covering area 2211 can refer to the connection form of the first side wing 221a to the second covering area 2212 described above, which will not be repeated here.

[0116] Please refer again to the structure form of the insulation sheet 22 in Figure 9c , when the connection form of the first side wing 221a to the side of the second covering area 2212 which is not provided with a side wing can be that the edge of the first side wing 221a is just spliced with the edge of the side of the second covering area 2212 which is not provided with a side wing, a first bending area 221e is arranged between the first side wing 221a and the first covering area 2211, and a second bending area 221f is arranged between the second side wing 221b and the second covering area 2212. When the insulation sheet 22 forms a cavity covering the bare battery cell 21, the first bending area 221e and the second bending area 221f can form two rounded corners 12 of the circumferential covering area 221, that is, through the arrangement of the above bending areas, the side wing can be bent more easily relative to the covering area, and the insulation sheet 22 can be more easily formed to cover the cavity.

[0117] Please refer to the structure form of the insulation sheet 22 in Figure 9d , when the connection form of the first side wing 221a to the side of the second covering area 2212 which is not provided with a side wing can be that the first side wing 221a at least partially overlaps the side of the second covering area 2212 which is not provided with a side wing, a first bending area 221e is arranged between the first side wing 221a and the first covering area 2211, a second bending area 221f is arranged at the overlapping part of the first side wing 221a and the second covering area 2212, a third bending area 221g is arranged between the second side wing 221b and the second covering area 2212, and a fourth bending area 221h is arranged at the overlapping part of the second side wing 221b and the first covering area 2211. When the insulation sheet 22 forms a cavity covering the bare battery cell 21, the first bending area 221e, the second bending area 221f, the third bending area 221g, and the fourth bending area 221h can form four rounded corners 12 of the circumferential covering area 221, that is, through the arrangement of the above bending areas, the side wing can be bent more easily relative to the covering area, and the insulation sheet 22 can be more easily formed to cover the cavity.

[0118] In another example, as shown in Figure 9eThe insulating sheet 22 in the middle has a structure in which side wings are provided on both sides of the first covering area 2211, and no side wings are provided on both sides of the second covering area 2212. The first covering area 2211 and the second covering area 2212 cover the first side 214 of the bare cell 21, and the side wings cover the second side 215 of the bare cell 21. Specifically, the first covering area 2211 has a first side wing 221a and a second side wing 221b on both sides. When the insulating sheet 22 forms a cavity covering the bare battery cell 21, the first side wing 221a folds toward the second side 215 of the bare battery cell 21, and the second side wing 221b also folds toward the second side 215 of the bare battery cell 21, so that the first side wing 221a is connected to the second covering area 2212, and the second side wing 221b is connected to the second covering area 2212, so as to cover the second side 215 of the bare battery cell 21 through the first side wing 221a and the second side wing 221b.

[0119] Furthermore, such as Figure 9e The structure of the insulating sheet 22, when covering the second side 215 of the bare cell 21 with its side wings, allows the connection between the first side wing 221a and the second covering area 2212 to be such that the edge of the first side wing 221a just meets the edge of the second covering area 2212 without side wings, completely covering the second side 215 of the bare cell 21. This achieves full coverage of the bare cell 21 with minimal area of ​​the insulating sheet 22, reducing material consumption and saving on battery manufacturing costs. Alternatively, as... Figure 9f The structure of the insulating sheet 22 is such that the connection between the first side wing 221a and the second covering area 2212 can be such that the first side wing 221a and the side of the second covering area 2212 without side wings at least partially overlap, that is, the edge of the first side wing 221a can overlap the second covering area 2212. At this time, since there is an overlap between the first side wing 221a and the second covering area 2212, the connection between the first side wing 221a and the second covering area 2212 can be tighter. At the same time, the overlapping connection can thicken the material thickness of the connection part, which can further strengthen the structural strength of the connection part and effectively prevent the insulating sheet 22 from being damaged.

[0120] Since the two second side surfaces 215 of the bare cell 21 have the same structural dimensions, the connection between the second side wing 221b and the second covering area 2212 can be referred to the connection between the first side wing 221a and the second covering area 2212 described above, and will not be repeated here.

[0121] Please refer to it again. Figure 9eThe structure of the insulation sheet 22 in the first kind of structure, when the connection form of the first side wing 221a and the second covering area 2212 can be that the edge of the first side wing 221a just splices the edge of the second covering area 2212, a first bending area 221e is arranged between the first side wing 221a and the first covering area 2211, and a second bending area 221f is arranged between the second side wing 221b and the first covering area 2211. When the insulation sheet 22 forms the cavity covering the bare battery cell 21, the first bending area 221e and the second bending area 221f can form two round corners 12 of the circumferential covering area 221, that is, through the arrangement of the above bending areas, the side wing can be bent more easily relative to the covering area, and the insulation sheet 22 can be more easily formed to cover the cavity.

[0122] Please refer to Figure 9f The structure of the insulation sheet 22 in the first kind of structure, when the connection form of the first side wing 221a and the second covering area 2212 can be that the edge of the first side wing 221a just splices the edge of the second covering area 2212, a first bending area 221e is arranged between the first side wing 221a and the first covering area 2211, and a second bending area 221f is arranged between the second side wing 221b and the first covering area 2211. When the insulation sheet 22 forms the cavity covering the bare battery cell 21, the first bending area 221e and the second bending area 221f can form two round corners 12 of the circumferential covering area 221, that is, through the arrangement of the above bending areas, the side wing can be bent more easily relative to the covering area, and the insulation sheet 22 can be more easily formed to cover the cavity.

[0123] In order to realize the overall covering of the insulation sheet 22 to the bare battery cell 21, the above-mentioned first kind of structure of the insulation sheet 22 is taken as an example, that is, the structure of the insulation sheet 22 shown in Figure 9a The size relationship between the size of each part of the insulation sheet 22 and the size of the bare battery cell 21 should meet:

[0124] The length X1 of the first covering area 2211 should be not less than the height H1 of the bare battery cell 21, the width Y1 of the first covering area 2211 should be not less than the length L1 of the bare battery cell 21, the width Y2 of the first side wing 221a should be not less than half of the width W1 of the bare battery cell 21, and the width Y3 of the second covering area 2212 should be not less than the width W1 of the bare battery cell 21.

[0125] That is:

[0126] X1≥H1;

[0127] Y1≥L1;

[0128]

[0129] Y3≥W1;

[0130] In order to realize the tightness of the insulation sheet 22 to the bare battery cell 21, save space, the size relationship between the insulation sheet 22 and the bare battery cell 21 should also satisfy:

[0131] X1≤H1+5mm;

[0132] Y1≤L1+5mm;

[0133] Y2≤W1;

[0134] Y3≤W1+5mm;

[0135] That is, the length X1 of the first wrapping area 2211 can be H1, H1+0.1mm, H1+0.2mm, H1+0.5mm, H1+1mm, H1+2mm, H1+5mm; the width Y1 of the first wrapping area 2211 can be L1, L1+0.1mm, L1+0.2mm, L1+0.5mm, L1+1mm, L1+2mm, L1+5mm; the width Y2 of the first side wing 221a can be W1; the width Y3 of the second wrapping area 2212 can be W1, W1+0.1mm, W1+0.2mm, W1+0.5mm, W1+1mm, W1+2mm, W1+5mm.

[0136] It can be understood that the size of the above insulation sheet 22 is only some examples, and in the actual design process, as long as the size of the insulation sheet 22 and the size of the bare battery cell 21 satisfy the above relationship, it is not limited in the embodiment.

[0137] Some embodiments, please refer to Figure 10 The battery 100 further comprises a tape 30, which can be used to adhere to the two connecting parts of the insulation sheet 22, so that the insulation sheet 22 is connected to form a cavity for wrapping the bare battery cell 21, and at this time the tape 30 is located outside the cavity. In this way, by setting the tape 30, the circumferential wrapping area 221 and the bottom wrapping area 222 can be connected, so that not only the insulation sheet 22 can effectively wrap the bare battery cell 21, but also the insulation sheet 22 can be easily disassembled when the bare battery cell 21 inside the battery 100 is subsequently maintained.

[0138] Further, the adhesive tape 30 can be attached to the connecting part of the first side wing 221a and the third side wing 221c of the insulation sheet 22, and the connecting part of the second side wing 221b and the fourth side wing 221d. By attaching the adhesive tape 30 to the above-mentioned positions, the fixation of the insulation sheet 22 can be achieved, and the weak position of the insulation sheet 22 can be strengthened. It can be understood that only one adhesive tape 30 attachment position is given in the embodiment, and the specific attachment position can be adjusted according to the actual situation, which is not specifically limited in the embodiment.

[0139] Further, no adhesive layer is arranged between the insulation sheet 22 and the bare battery cell 21, that is, no adhesive layer is arranged on the side surface of the insulation sheet 22 inside the cavity, and then the fixation between the insulation sheet 22 and the bare battery cell 21 is mainly achieved by the adhesive tape 30. If the cavity of the insulation sheet 22 is fixed relative to the bare battery cell 21 by using an adhesive layer, that is, an adhesive layer is arranged on the side surface of the insulation sheet 22 inside the cavity, and then the insulation sheet 22 is attached to the adhesive layer, the insulation sheet 22 is not easy to be disassembled in the subsequent maintenance process of the bare battery cell 21, and at the same time, residual adhesive will be left on the surface of the bare battery cell 21, which affects the installation of the new insulation sheet 22. In addition, the arrangement of the adhesive layer on the outer surface of the bare battery cell 21 can avoid the situation that the heat of the bare battery cell 21 cannot be dissipated due to the existence of the adhesive layer, that is, the arrangement of the adhesive layer can improve the heat dissipation performance of the bare battery cell 21. In addition, the cancellation of the adhesive layer makes a certain spacing space exist between the bare battery cell 21 and the insulation sheet 22, at this time, the space for the circulation flow of the electrolyte can be expanded, and the immersion degree of the electrolyte can be improved.

[0140] In some embodiments, in order to realize the circulation flow of the electrolyte between the insulation sheet 22 and the bare battery cell 21, and improve the immersion effect of the electrolyte, a liquid guide channel 223 is arranged on the insulation sheet 22, thereby providing a circulation channel for the electrolyte inside the shell 10. Specifically, as known from the foregoing, the cavity for wrapping the bare battery cell 21 formed by the insulation sheet 22 is mainly formed by the adhesive bonding of the above-mentioned peripheral wrapping area 221 and the bottom wrapping area 222, and therefore, the liquid guide channel 223 can be the gap formed at the connecting part of each wrapping area, such as the connecting part of the first side wing 221a and the third side wing 221c, the connecting part of the second side wing 221b and the fourth side wing 221d, the connecting gap between the first side wing 221a and the bottom wrapping area 222, the connecting gap between the third side wing 221c and the bottom wrapping area 222, and the like.

[0141] Since the connection of each wrapping area of the insulation sheet 22 is fixed by the adhesive tape 30, there is a connection gap at the connection boundary of each wrapping area, which can allow the electrolyte to pass through, so that it is not necessary to additionally provide the liquid guide channel 223 on the insulation sheet 22, which reduces the structural design difficulty of the insulation sheet 22 and improves the infiltration effect of the electrolyte.

[0142] It can be understood that, in other embodiments, the liquid guide channel 223 can also be formed by holes directly opened at any position of the peripheral wrapping area 221 of the insulation sheet 22, for example, through holes are formed on the first wrapping area 2211, the first side wing 221a, the second side wing 221b, the second wrapping area 2212, the third side wing 221c, and the fourth side wing 221d. Similarly, the circulation flow of the electrolyte between the space between the bare battery cell 21 and the insulation sheet 22 and the space between the insulation sheet 22 and the shell 10 can be achieved to improve the infiltration efficiency of the electrolyte.

[0143] It can be seen that, as long as the circulation flow of the electrolyte can be achieved, the forming mode of the liquid guide channel 223 is not specifically limited in the present embodiment.

[0144] Please refer to Figures 11 to 13 In some embodiments, the battery 100 further comprises a top cover assembly 40, which covers the opening of the accommodating cavity of the shell 10, and the top cover assembly 40 is sealingly connected with the shell 10 to achieve the sealing effect of the accommodating cavity, and the top cover assembly 40 is spaced apart from the insulation sheet 22.

[0145] The top cover assembly 40 comprises a top cover plate 41 and a lower plastic 42 arranged on the side of the top cover plate 41 facing the bare battery cell 21, and the top cover plate 41 is weldingly connected with the opening of the shell 10 to achieve the sealing of the accommodating cavity of the shell 10, and the edge of the lower plastic 42 is provided with a plurality of connecting bosses 421 extending towards the bare battery cell 21. After the insulation sheet 22 forms a cavity for wrapping the bare battery cell 21, the bare battery cell 21 is arranged inside the cavity, and in order to achieve the overall protection of the bare battery cell 21, the insulation sheet 22 is also wrapped on the outside of each connecting boss 421. Considering that the connecting boss 421 is also made of plastic material, in order to achieve the stable connection between the insulation sheet 22 and the lower plastic 42, each connecting boss 421 has a first hot melt connection position 42a, and the insulation sheet 22 also has a second hot melt connection position 2213, and the insulation sheet 22 and the plurality of connecting bosses 421 are hot melt connected at the hot melt connection area to achieve the stable connection between the insulation sheet 22 and the top cover assembly 40, thereby achieving the overall protection of the bare battery cell 21.

[0146] Specifically, as Figure 14As shown, the first hot melt connection position 42a is arranged on the outer side of each connecting boss 421, and since the connecting boss 421 extends towards the bare cell 21, the outer side of the connecting boss 421 has a larger area, and the area of the first hot melt connection position 42a can be increased accordingly. When the insulating sheet 22 is hot melt connected through the first hot melt connection position 42a, the hot melt connection area is larger, and the connection stability of the insulating sheet 22 is stronger.

[0147] Further, the top surface 224 of the insulating sheet 22, i.e. the surface towards the top cover plate 41, has a spacing between the lower surface of the top cover plate 41 (i.e. the surface of the top cover plate 41 towards the bare cell 21). In this way, on the one hand, the surface can prevent the insulating sheet 22 from interfering with the top cover assembly 40 during welding of the top cover assembly 40 and the shell 10, causing the insulating sheet 22 to be curled and deformed. On the other hand, when the insulating sheet 22 is spaced apart from the top cover assembly 40, the spacing can form a gas flow channel between the insulating sheet 22 and the top cover plate 41, which can be used for gas flow between the insulating sheet 22 and the bare cell 21, so that the space between the insulating sheet 22 and the bare cell 21 and the space between the shell 10 and the insulating sheet 22 are communicated, allowing the gas inside the shell 10 to circulate inside the shell 10, thereby improving the heat dissipation function of the bare cell 21, reducing the pressure difference between the inside of the shell 10 and the outside, and improving the safety of the battery 100. In addition, considering that the bare cell 21 will generate gas during use of the battery 100, since the space between the shell 10 and the insulating sheet 22 can be communicated with the space between the insulating sheet 22 and the bare cell 21, the gas generated by the bare cell 22 can flow between the insulating sheet 22 and the shell 10, thereby reducing the pressure of the gas generated by the bare cell 21 on the insulating sheet 21, and further improving the safety of the battery 100.

[0148] The above describes the battery according to the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the battery and the core idea of the present application; meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A battery, characterized by, The battery comprises: a shell having an open accommodating cavity; an electric core assembly arranged in the accommodating cavity, the electric core assembly comprising a bare electric core and an insulation sheet wrapped outside the bare electric core, the bare electric core having a body part with a top end face, a bottom end face at two ends of the body part, and a circumferential surface connected to the top end face and the bottom end face, the insulation sheet wrapping the circumferential surface and the bottom end face; a separation piece arranged in the shell for separating the bottom end face of the bare electric core from a bottom surface of the shell; a top cover assembly sealingly connected with the shell for closing the opening of the shell, the top cover assembly being arranged in space with the insulation sheet; the insulation sheet comprises a circumferential wrapping area wrapping the circumferential surface of the body part and a bottom wrapping area wrapping the bottom end face of the body part, the separation piece being arranged on a side of the bottom wrapping area away from the body part; a liquid guide channel is arranged on the insulation sheet, the liquid guide channel guiding electrolyte between the bare electric core and the insulation sheet to a space between the insulation sheet and the shell, the liquid guide channel being a gap formed at a connection between the circumferential wrapping area and the bottom wrapping area; the battery further comprises a tape arranged in the circumferential wrapping area or between the circumferential wrapping area and the bottom wrapping area, so that the circumferential wrapping area and the bottom wrapping area enclose a cavity for wrapping the bare electric core, and the tape is located outside the cavity; the top cover assembly comprises a top cover plate and a lower plastic connected to a side of the top cover plate facing the bare electric core, an edge of the lower plastic being provided with a plurality of connecting bosses extending towards the bare electric core, the insulation sheet wrapping outside each of the connecting bosses; a gap is formed between a top surface of the insulation sheet and a side of the top cover plate facing the bare electric core, and an airflow channel is formed between the insulation sheet and the top cover assembly.

2. The battery of claim 1, wherein, The separation piece is an insulation sheet parallel to the bottom end face, and the thickness of the insulation sheet is 0.1mm-2mm.

3. The battery of claim 2, wherein, At least one surface of the separation piece is provided with a protruding structure.

4. The battery of claim 1, wherein, The separation piece is arranged in parallel to a side of the bottom wrapping area away from the body part.

5. The battery of claim 4, wherein, The thickness sum of the separation piece and the bottom wrapping area is 0.1mm-2mm.

6. The battery of claim 4, wherein, The separation piece and the bottom wrapping area are provided with corresponding positioning holes for positioning.

7. The battery of claim 6, wherein, The separation piece is provided with two first positioning holes, and the bottom wrapping area is provided with two second positioning holes, the two first positioning holes being located at two ends of the separation piece and on the same center line.

8. The battery of claim 7, wherein, The separation piece is further provided with a foolproof hole deviating from the center line of the separation piece.

9. The battery of claim 4, wherein, The separation piece and the bottom wrapping area are connected by a hot melting method.

10. The battery of claim 4, wherein, The separation piece and the bottom wrapping area are made of the same material by a hot plastic process.

11. The battery according to any one of claims 4 to 10, characterized in that, The surfaces of the circumferential wrapping area and the bottom wrapping area of the insulation sheet facing the bare electric core are not provided with a glue layer between the surfaces and the bare electric core.

12. The battery of any one of claims 4 to 10, wherein, The separation piece and the bare electric core satisfy: L1+3mm≤L2≤L1+6mm; W1+3mm≤W2≤W1+6mm; wherein L1 is the length of the bare cell, W1 is the width of the bare cell; L2 is the length of the spacer, W2 is the width of the spacer.

Images