Battery and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery and a battery pack, the battery comprises: a pole group, one side of which is provided with a tab; the packaging film is divided into a first sub-packaging film and a second sub-packaging film by a folding line, the first sub-packaging film and the second sub-packaging film are respectively and concavely extended to form an accommodating groove for accommodating the pole group, and the second sub-packaging film is folded along the folding line and is opposite to and attached to the first sub-packaging film so as to wrap the pole group; the peripheral sides of the first sub-packaging film and the second sub-packaging film are respectively provided with a packaging area surrounding the pole group; the distance L1 between the adjacent edges of the two containing grooves and the depth H1 of the containing grooves meet the condition that L1 / H1 is larger than or equal to 0.6 and smaller than or equal to 100. By limiting the proportional relation between the distance between the adjacent edges of the two containing grooves and the depth of the containing grooves, the proper distance between the containing grooves can be reserved when the depth of the containing grooves is punched, the packaging quality of the battery is improved, materials of the packaging film are saved, and the situation that the packaging film cracks in the pit punching process, and consequently sealing failure is caused is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to batteries and battery packs. Background Art

[0002] A battery mainly consists of pole ears, a pole group, and a packaging film. The packaging film encapsulates the pole group and the pole ears and is sealed by hot pressing. Specifically, first, the packaging film is punched with double pits or single pits, then the pole group after welding the pole ears is placed into the punched pits, and finally, the upper and lower layers of the packaging film are heat-sealed and melted to be hermetically sealed and fixed.

[0003] However, when the existing batteries adopt the double-pit process, it is difficult to control the size of the punched pits. If the punched pits are too large, the packaging film is likely to rupture during the use of the battery; if the punched pits are too small, materials will be wasted. Summary of the Invention

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem that it is difficult to control the size of the punched pits when the existing batteries adopt the double-pit process, and there are problems such as easy rupture of the packaging film and material waste.

[0005] In a first aspect, the present invention provides a battery, including:

[0006] A pole group with pole ears provided on one side;

[0007] A packaging film separated into a first sub-packaging film and a second sub-packaging film by a folding line. The first sub-packaging film and the second sub-packaging film respectively extend inwards to form receiving grooves for receiving the pole group. The second sub-packaging film is folded along the folding line and is opposite to and adheres to the first sub-packaging film to wrap the pole group. Sealing areas surrounding the pole group are respectively provided on the circumferences of the first sub-packaging film and the second sub-packaging film;

[0008] The adjacent edge spacing L1 between the adjacent edges of the two receiving grooves and the depth H1 of the receiving grooves satisfy 0.6 ≤ L1 / H1 ≤ 100.

[0009] Beneficial effects: For the battery of the present invention, indentations are respectively formed on the first sub-packaging film and the second sub-packaging film to form receiving grooves. The electrode group after welding the tab is placed into the receiving groove of the first sub-packaging film. The second sub-packaging film is folded along the folding line, the first sub-packaging film and the second sub-packaging film are adhered together, and the electrode group is wrapped in the two receiving grooves. Finally, the packaging areas on the peripheries of the first sub-packaging film and the second sub-packaging film are heat-melted to form a sealed fixation. The structure is simple and convenient to use. By defining the proportional relationship L1 / H1 between the adjacent edge spacing L1 of the two receiving grooves and the depth H1 of the receiving groove, when stamping the depth of the receiving groove, an appropriate receiving groove spacing can be reserved, improving the packaging quality of the battery and saving the material of the packaging film, and avoiding the situation where the adjacent edge spacing of the two receiving grooves is too small due to the over-deep receiving groove, resulting in excessive stretching and deformation and too poor strength of the packaging film during the indentation process, and cracking occurs, causing the battery seal to fail.

[0010] In an optional embodiment, the adjacent edge spacing L1 of the two receiving grooves satisfies 1 mm ≤ L1 ≤ 50 mm, and the depth H1 of the receiving groove satisfies 0.5 mm ≤ H1 ≤ 50 mm.

[0011] Beneficial effects: By defining the adjacent edge spacing of the two receiving grooves, sufficient strength can be ensured when folding the packaging film. During indentation, the packaging film near the edge of the receiving groove is stretched and deformed and there is stress. If the adjacent edge spacing L1 of the two receiving grooves is too small, when folding the packaging film, the edge of the receiving groove is prone to cracking, and there is also a potential risk of cracking and damage to the battery during subsequent use. By defining the depth of the receiving groove, sufficient buffer space can be reserved for the installation of the electrode group, preventing the electrode group from being compressed and deformed or the tab from being bent, and also restricting the movement of the electrode group in the receiving groove, avoiding battery short-circuit caused by vibration.

[0012] In an optional embodiment, the spacing L2 between the side of the receiving groove in the width direction of the packaging film and the side of the packaging film in the width direction satisfies 2.5 mm ≤ L2 ≤ 100 mm, and 5 ≤ L2 / H1 ≤ 50.

[0013] Beneficial effects: By defining the spacing L2 between the side of the receiving groove in the width direction of the packaging film and the side of the packaging film in the width direction, a sufficiently wide packaging area can be reserved for heat-melting and fixing the first sub-packaging film and the second sub-packaging film. Further defining the ratio of L2 / H1 can ensure the packaging quality of the battery. If the ratio of L2 / H1 is too small, then the reserved L2 is insufficient. After the heat-melting shrinkage of the packaging area, the melt width is too narrow, and the heat-melting plastic sealing is prone to failure. If the ratio of L2 / H1 is too large, then the reserved L2 is too large, wasting space and materials.

[0014] In an optional embodiment, the packaging film is in the shape of a square sheet and has first chamfers at four corners. The dimension L3 of the first chamfer in the length direction of the packaging film satisfies 1mm≤L3≤50mm, and the dimension W1 of the first chamfer in the width direction of the packaging film satisfies 1mm≤W1≤50mm.

[0015] Beneficial effects: By providing the first chamfers at the four corners of the packaging film, the corners of the packaging film can be prevented from scratching the workers, and the transportation is also convenient. By limiting the size of the first chamfers in the length and width directions of the packaging film, stress concentration can be effectively reduced, the packaging film can be prevented from tearing at the corners, and the packaging quality of the battery can be improved.

[0016] In an optional embodiment, the cross-section of the accommodating groove is an inverted trapezoid, and second chamfers are provided at the connecting corners of adjacent side walls of the accommodating groove respectively corresponding to the first chamfers, and the distance L4 between the first chamfer and the second chamfer satisfies 2mm≤L4≤100mm.

[0017] Beneficial effect: The cross section of the receiving groove is set to an inverted trapezoid, and a second chamfer is provided at the connecting corners of the adjacent side walls of the receiving groove corresponding to the first chamfer, which can reduce the stress concentration at the receiving groove. Further limiting the spacing L4 between the first chamfer and the second chamfer can ensure the hot melt width of the packaging area and ensure the packaging quality. If the spacing L4 between the first chamfer and the second chamfer is too small, the hot melt width of the packaging area is narrow, which may easily lead to packaging failure of the battery. If the spacing L4 between the first chamfer and the second chamfer is too large, the material of the packaging film is wasted.

[0018] In an optional implementation, the second chamfer is a rounded corner, and the radius R of the rounded corner satisfies 0.4 mm ≤ R ≤ 6 mm.

[0019] Beneficial effect: Setting the second chamfer as a fillet and limiting the radius size range of the fillet can further improve the stability and space utilization of the packaging film during the punching process. If the radius R of the fillet is too small, the packaging film is easily subjected to a large shear force when punching the packaging film, resulting in the packaging film breaking and failure. If the radius R of the fillet is too large, the arc will interfere with the edge of the electrode group and collapse the electrode group, resulting in damage to the electrode group and a short circuit.

[0020] In an optional implementation, when 0.5 mm ≤ H1 < 1 mm, the radius R of the fillet satisfies, 0.4 mm ≤ R < 1 mm;

[0021] When 1mm≤H1<5mm, the radius R of the fillet satisfies, 1mm≤R<3mm;

[0022] When 5mm≤H1≤50mm, the radius R of the fillet satisfies, 3mm≤R≤6mm.

[0023] Beneficial effect: By setting the radius R of the arc corresponding to the depth H1 of the receiving groove, the stability and space utilization of the packaging film during the punching process can be further improved.

[0024] In an optional embodiment, the packaging film has notches at two opposite ends of the folding line.

[0025] Beneficial effect: by providing notches at the two opposite ends of the folding line, chamfers can be formed after the packaging film is folded, so as to prevent the corners of the packaging film from scratching the workers and facilitate transportation.

[0026] In an optional embodiment, the groove wall of the accommodating groove is inclined relative to the groove bottom, and the inclination angle θ satisfies 95°≤θ≤160°.

[0027] Beneficial effect: By setting the groove wall of the receiving groove at an angle, it is easy to smoothly install and limit the electrode group, reduce the deviation of the electrode group, and thus provide better support for the electrode group, ensure that the packaging film can evenly cover the electrode group, and improve the packaging quality. If the inclination angle θ is too small, the packaging film will be subjected to a large shear force during the punching, and the hot melt layer will easily break and fail. If the inclination angle θ is too large, in order to avoid interference between the groove wall and the electrode group, a large avoidance space needs to be reserved, resulting in a waste of space and materials.

[0028] In a second aspect, the present invention further provides a battery pack, comprising: the above-mentioned battery.

[0029] Beneficial effect: Since the battery pack includes a battery, it has the same effect as the battery and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of a partial structure of a battery according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic structural diagram of a packaging film of a battery before being folded according to an embodiment of the present invention;

[0033] Figure 3 for Figure 2 A top view of

[0034] Figure 4 for Figure 3 Cross-sectional view at AA in the middle.

[0035] Description of reference numerals:

[0036] 1. Pole group; 101. Pole ear; 102. First chamfer; 2. Packaging film; 201. First sub-packaging film; 202. Second sub-packaging film; 203. Accommodating groove; 204. Second chamfer; 205. Notch; 3. Packaging area. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0039] According to an embodiment of the present invention, on the one hand, refer to Figure 1 , a battery is provided, comprising: an electrode group 1 and a packaging film 2. A pole ear 101 is provided on one side of the electrode group 1. The packaging film 2 is divided into a first sub-packaging film 201 and a second sub-packaging film 202 by a folding line, the first sub-packaging film 201 and the second sub-packaging film 202 are respectively concavely extended to form a receiving groove 203 for receiving the electrode group 1, the second sub-packaging film 202 is folded along the folding line and is opposite to and attached to the first sub-packaging film 201 to cover the electrode group 1, and the first sub-packaging film 201 and the second sub-packaging film 202 are respectively provided with a packaging area 3 surrounding the electrode group 1. The adjacent edge spacing L1 of the two receiving grooves 203 and the depth H1 of the receiving grooves 203 satisfy 0.6≤L1 / H1≤100.

[0040] It can be seen that for the battery provided by the embodiment of the present invention, indentations are respectively formed on the first sub-packaging film 201 and the second sub-packaging film 202 to form accommodation grooves 203. The electrode group 1 after welding the electrode tabs 101 is placed into the accommodation grooves 203 of the first sub-packaging film 201. The second sub-packaging film 202 is folded along the folding line, the first sub-packaging film 201 and the second sub-packaging film 202 are adhered to each other, and the electrode group 1 is wrapped within the two accommodation grooves 203. Finally, the packaging areas 3 on the peripheries of the first sub-packaging film 201 and the second sub-packaging film 202 are heat-melted to form a sealed fixation. The structure is simple and convenient for installation. By defining the proportional relationship L1 / H1 between the adjacent edge spacing L1 of the two accommodation grooves 203 and the depth H1 of the accommodation groove 203, when stamping the depth of the accommodation groove 203, an appropriate spacing for the accommodation grooves 203 can be reserved, improving the packaging quality of the battery and saving the material of the packaging film 2, and avoiding the situation where the accommodation groove 203 is too deep and the adjacent edge spacing of the two accommodation grooves 203 is too small, resulting in excessive stretching and deformation and too thin a thickness of the packaging film 2 during the indentation process, with too poor strength and cracking, causing the battery seal to fail.

[0041] In the traditional indentation process, in order to facilitate the assembly of the electrode group 1, the groove depth of the accommodation groove 203 is usually designed to be 1.1 to 1.2 times the thickness of the electrode group 1, leaving a buffer space for the assembly of the electrode group 1 to avoid the electrode group 1 being squeezed by the packaging film 2. The embodiment of the present invention further defines the proportional relationship L1 / H1 between the adjacent edge spacing L1 of the two accommodation grooves 203 and the depth H1 of the accommodation groove 203. The depths of the accommodation grooves 203 of both the first sub-packaging film 201 and the second sub-packaging film 202 need to be within this range, and the depths of the accommodation grooves 203 of the first sub-packaging film 201 and the second sub-packaging film 202 can be equal. If L1 / H1 is less than 0.6, the accommodation groove 203 is too deep and the adjacent edge spacing of the two accommodation grooves 203 is too small, easily causing the packaging film 2 to rupture during the indentation process, resulting in the failure of the battery seal. If L1 / H1 is greater than 100, the overall size of the battery is too large, wasting the space of the battery and the material of the packaging film 2. Moreover, the greater the thickness of the packaging area 3, the longer the heat-melting time, and it is easy to damage the electrode group 1. In the embodiment of the present invention, L1 / H1 can be 0.6, 1, 10, 100, etc.

[0042] Specifically, please refer to Figure 3 , the folding line is Figure 3 O-O shown. After the packaging film 2 is folded along the folding line, the edges of the accommodation grooves 203 on the first sub-packaging film 201 and the second sub-packaging film 202 are aligned, and the two accommodation grooves 203 together form a cavity for accommodating the electrode group 1. The electrode tabs 101 include a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab are spaced apart on the side of the electrode group 1 away from the folding line.

[0043] It should be noted that the material of the packaging film 2 in the embodiment of the present invention can be selected according to the actual situation. For example, the packaging film 2 is an aluminum-plastic film.

[0044] In one embodiment, referring to Figure 3 , the adjacent edge spacing L1 of the two receiving grooves 203 satisfies 1 mm ≤ L1 ≤ 50 mm, and the depth H1 of the receiving groove 203 satisfies 0.5 mm ≤ H1 ≤ 50 mm. By defining the adjacent edge spacing of the two receiving grooves 203, sufficient strength can be ensured when folding the encapsulation film 2. When punching the pits, the encapsulation film 2 near the edge of the receiving groove 203 is stretched and deformed and there is stress. If the adjacent edge spacing L1 of the two receiving grooves 203 is too small, the edge of the receiving groove 203 is likely to crack when folding the encapsulation film 2, and there is also a hidden danger of cracking and breakage during subsequent use of the battery. By defining the depth of the receiving groove 203, sufficient buffer space can be reserved for the installation of the electrode group 1, preventing the electrode group 1 from being deformed under pressure or the electrode tab 101 from being bent, and also restricting the movement of the electrode group 1 in the receiving groove 203 to avoid battery short circuit caused by vibration.

[0045] Further, in one embodiment, referring to Figure 3 , the spacing L2 between the side of the receiving groove 203 in the width direction of the encapsulation film 2 and the side of the encapsulation film 2 in the width direction satisfies 2.5 mm ≤ L2 ≤ 100 mm, and 5 ≤ L2 / H1 ≤ 50. By defining the spacing L2 between the side of the receiving groove 203 in the width direction of the encapsulation film 2 and the side of the encapsulation film 2 in the width direction, sufficient width of the encapsulation area 3 can be reserved for heat-melting and fixing the first sub-encapsulation film 201 and the second sub-encapsulation film 202. Further defining the ratio of L2 / H1 can ensure the encapsulation quality of the battery. If the ratio of L2 / H1 is less than 5, the reserved L2 is insufficient, and after the encapsulation area 3 shrinks due to heat melting, the melting width is too narrow and the heat-melting plastic sealing is likely to fail. If the ratio of L2 / H1 is greater than 50, the reserved L2 is too large, wasting space and materials.

[0046] Specifically, for the length direction of the encapsulation film 2, refer to the arrow L in Figure 3 , and for the width direction of the encapsulation film 2, refer to the arrow W in Figure 3 .

[0047] Even further, in one embodiment, the spacing between the side of the receiving groove 203 in the length direction of the encapsulation film 2 and the side of the encapsulation film 2 in the length direction is also between 2.5 mm and 100 mm to leave sufficient width of the encapsulation area 3 on the side of the encapsulation film away from the folding line.

[0048] It should be noted that the battery can be of a rectangular structure, the encapsulation film 2 corresponds to a square sheet, and the folding line can be the midline in the length direction of the encapsulation film 2. The first sub-encapsulation film 201 and the second sub-encapsulation film 202 are respectively provided with continuous encapsulation areas 3 at three sides away from the folding line. After the encapsulation film 2 is folded, the encapsulation areas 3 of the first sub-encapsulation film 201 and the second sub-encapsulation film 202 are relatively adhered, and the first sub-encapsulation film 201 and the second sub-encapsulation film 202 are fixedly bonded by heat-sealing the encapsulation area 3.

[0049] In one embodiment, please refer to Figure 3 , the encapsulation film 2 is a square sheet, and first chamfers 102 are provided at four corners. The dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 satisfies 1 mm ≤ L3 ≤ 50 mm, and the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 satisfies 1 mm ≤ W1 ≤ 50 mm. By providing the first chamfers 102 at the four corners of the encapsulation film 2, it is possible to prevent the corners of the encapsulation film 2 from scratching the staff and also facilitate transportation. By defining the dimensions of the first chamfer 102 in the length direction and width direction of the encapsulation film 2, stress concentration can be effectively reduced, the encapsulation film 2 can be prevented from tearing at the corners, and the encapsulation quality of the battery can be improved.

[0050] Specifically, the dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 can be 1 mm, 5 mm, 25 mm, 50 mm, and the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 can be 1 mm, 5 mm, 25 mm, 50 mm. The dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 and the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 can be selected to be equal or unequal.

[0051] In one embodiment, please refer to Figure 3 and Figure 4 , the cross-section of the receiving groove 203 is a trapezoid with a narrow top and a wide bottom, and second chamfers 204 are respectively provided at the connecting corners of the adjacent side walls of the receiving groove 203 corresponding to the first chamfers 102. The distance L4 between the first chamfer 102 and the second chamfer 204 satisfies 2 mm ≤ L4 ≤ 100 mm. By setting the cross-section of the receiving groove 203 as a trapezoid with a narrow top and a wide bottom and providing second chamfers 204 at the connecting corners of the adjacent side walls of the receiving groove 203 corresponding to the first chamfers 102, stress concentration at the receiving groove 203 can be reduced. Further defining the distance L4 between the first chamfer 102 and the second chamfer 204 can ensure the heat-sealing width of the encapsulation area 3 and ensure the encapsulation quality. If the distance L4 between the first chamfer 102 and the second chamfer 204 is less than 2 mm, the heat-sealing width of the encapsulation area 3 is relatively narrow, which is likely to cause the encapsulation of the battery to fail. If the distance L4 between the first chamfer 102 and the second chamfer 204 is too large, the material of the encapsulation film 2 is wasted.

[0052] Furthermore, in one embodiment, please refer toFigure 2 and Figure 3 The second chamfer 204 is a rounded corner, and the radius R of the rounded corner satisfies 0.4 mm ≤ R ≤ 6 mm. Setting the second chamfer 204 as a rounded corner and restricting the radius dimension range of the rounded corner can further improve the stability and space utilization rate of the encapsulation film 2 during the pit punching process. If the radius R of the rounded corner is too small, when the encapsulation film 2 is punched, the encapsulation film 2 is liable to bear a large shearing force, resulting in the rupture of the encapsulation film 2. If the radius R of the rounded corner is too large, the arc will interfere with the edge of the pole group 1 and collapse the pole group 1, resulting in damage to the pole group 1 and short circuit.

[0053] Furthermore, in one embodiment, when 0.5 mm ≤ H1 < 1 mm, the radius R of the rounded corner satisfies 0.4 mm ≤ R < 1 mm.

[0054] When 1 mm ≤ H1 < 5 mm, the radius R of the rounded corner satisfies 1 mm ≤ R < 3 mm.

[0055] When 5 mm ≤ H1 ≤ 50 mm, the radius R of the rounded corner satisfies 3 mm ≤ R ≤ 6 mm.

[0056] Correspondingly setting the radius R of the arc and the depth H1 of the receiving groove 203 can further improve the stability and space utilization rate of the encapsulation film 2 during the pit punching process.

[0057] Exemplarily, when H1 is 0.5 mm, the radius R of the rounded corner can be 0.4 mm, 0.5 mm, 0.9 mm. When H1 is 3 mm, the radius R of the rounded corner can be 1 mm, 2 mm, 2.5 mm. When H1 is 10 mm, the radius R of the rounded corner can be 3 mm, 4 mm, 6 mm.

[0058] In one embodiment, please refer to Figure 2 , notches 205 are respectively formed at opposite ends of the encapsulation film 2 at the folding line. By respectively forming notches 205 at opposite ends of the folding line, chamfers can be formed after the encapsulation film 2 is folded, avoiding scratching the staff by the corners of the encapsulation film 2 and also facilitating transportation.

[0059] In one embodiment, please refer to Figure 4 , the groove wall of the receiving groove 203 is inclined relative to the groove bottom, and the inclination angle θ satisfies 95° ≤ θ ≤ 160°. By inclinedly arranging the groove wall of the receiving groove 203, it is convenient to smoothly install and limit the pole group 1, reduce the offset of the pole group 1, thereby providing better support for the pole group 1, ensuring that the encapsulation film 2 can uniformly wrap the pole group 1, and improving the encapsulation quality. If the inclination angle θ is too small, the encapsulation film 2 is subject to a large shearing force during pit punching, and the hot melt layer is liable to be damaged and ineffective. If the inclination angle θ is too large, in order to avoid interference between the groove wall and the pole group 1, a large avoidance space needs to be reserved, resulting in waste of space and materials.

[0060] Of course, in other alternative embodiments, the battery may also be in other shapes, such as disc-shaped, elliptical cylindrical, etc. Correspondingly, the encapsulation film 2 and the electrode group 1 are adaptively arranged.

[0061] The process parameters of the battery according to the embodiments of the present invention will be further described in detail below in conjunction with specific embodiments. In the following embodiments and comparative examples, the battery has a rectangular structure, the encapsulation film 2 correspondingly has a square sheet shape, and the folding line is the midline in the length direction of the encapsulation film 2. The cross-section of the receiving groove 203 is an inverted trapezoid. It should be noted that these examples should not be construed as limiting the scope claimed by the present invention.

[0062] Embodiment 1:

[0063] The adjacent edge spacing L1 of the two receiving grooves 203 is 1.2 mm, the depth H1 of the receiving groove 203 is 2 mm, and the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges of the encapsulation film 2 in the length direction is 12 mm. Then L1 / H1 = 0.6, which is the minimum value in the embodiments of the present invention, L2 / H1 = 6, the dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 1 mm, the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 1 mm, the spacing L4 between the first chamfer 102 and the second chamfer 204 is 2 mm, the radius R of the rounded corner is 1 mm, and the inclination angle θ is 100°. The test verification results through the battery production line are shown in Table 1.

[0064] Embodiment 2:

[0065] The adjacent edge spacing L1 of the two receiving grooves 203 is 2 mm, the depth H1 of the receiving groove 203 is 2 mm, and the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges of the encapsulation film 2 in the length direction is 10 mm. Then L1 / H1 = 1, L2 / H1 = 5, which is the minimum value in the embodiments of the present invention, the dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 2 mm, the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 2 mm, the spacing L4 between the first chamfer 102 and the second chamfer 204 is 3 mm, the radius R of the rounded corner is 2 mm, and the inclination angle θ is 100°. The test verification results through the battery production line are shown in Table 1.

[0066] Embodiment 3:

[0067] The adjacent edge spacing L1 of the two receiving grooves 203 is 10 mm, the depth H1 of the receiving groove 203 is 5 mm, the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges in the length direction of the encapsulation film 2 is 100 mm, then L1 / H1 = 2, L2 / H1 = 20, the dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 10 mm, the W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 10 mm, the spacing L4 between the first chamfer 102 and the second chamfer 204 is 10 mm, the radius R of the rounded corner is 6 mm, which is the maximum value of the embodiment of the present invention, and the inclination angle θ is 150°. The test verification results through the battery production line are shown in Table 1.

[0068] Example 4:

[0069] The adjacent edge spacing L1 of the two receiving grooves 203 is 10 mm, the depth H1 of the receiving groove 203 is 5 mm, the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges in the length direction of the encapsulation film 2 is 60 mm, then L1 / H1 = 2, L2 / H1 = 12, the dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 10 mm, the W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 10 mm, the spacing L4 between the first chamfer 102 and the second chamfer 204 is 10 mm, the radius R of the rounded corner is 5 mm, the inclination angle θ is 95°, which is the minimum value of the embodiment of the present invention. The test verification results through the battery production line are shown in Table 1.

[0070] Example 5:

[0071] The adjacent edge spacing L1 of the two receiving grooves 203 is 40 mm, the depth H1 of the receiving groove 203 is 10 mm, the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges in the length direction of the encapsulation film 2 is 60 mm, then L1 / H1 = 4, L2 / H1 = 6, the dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 20 mm, the W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 20 mm, the spacing L4 between the first chamfer 102 and the second chamfer 204 is 20 mm, the radius R of the rounded corner is 5 mm, the inclination angle θ is 160°, which is the maximum value of the embodiment of the present invention. The test verification results through the battery production line are shown in Table 1.

[0072] Comparative Example 1:

[0073] The adjacent edge spacing L1 of the two receiving grooves 203 is 1 mm, the depth H1 of the receiving groove 203 is 2 mm, the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges of the encapsulation film 2 in the length direction is 12 mm. Then L1 / H1 = 0.5, which is less than 0.6, and L2 / H1 = 6. The dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 1 mm, the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 1 mm, the spacing L4 between the first chamfer 102 and the second chamfer 204 is 2 mm, the radius R of the rounded corner is 1 mm, and the inclination angle θ is 95°. The test verification results through the battery production line are shown in Table 1.

[0074] Comparative Example 2:

[0075] The adjacent edge spacing L1 of the two receiving grooves 203 is 2 mm, the depth H1 of the receiving groove 203 is 2 mm, the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges of the encapsulation film 2 in the length direction is 8 mm. Then L1 / H1 = 1, and L2 / H1 = 4, which is less than 5. The dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 2 mm, the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 2 mm, the spacing L4 between the first chamfer 102 and the second chamfer 204 is 3 mm, the radius R of the rounded corner is 2 mm, and the inclination angle θ is 100°. The test verification results through the battery production line are shown in Table 1.

[0076] Comparative Example 3:

[0077] The adjacent edge spacing L1 of the two receiving grooves 203 is 5 mm, the depth H1 of the receiving groove 203 is 2 mm, the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges of the encapsulation film 2 in the length direction is 12 mm. Then L1 / H1 = 2.5, and L2 / H1 = 6. The dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 2 mm, the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 2 mm, the spacing L4 between the first chamfer 102 and the second chamfer 204 is 1 mm, which is less than 2 mm. The radius R of the rounded corner is 2 mm, and the inclination angle θ is 100°. The test verification results through the battery production line are shown in Table 1.

[0078] Comparative Example 4:

[0079] The adjacent edge spacing L1 of the two receiving grooves 203 is 6 mm, the depth H1 of the receiving groove 203 is 0.6 mm, and the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges in the length direction of the encapsulation film 2 is 6 mm. Then L1 / H1 = 10, L2 / H1 = 10. The dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 2 mm, the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 2 mm, and the spacing L4 between the first chamfer 102 and the second chamfer 204 is 4 mm. The radius R of the rounded corner is 0.3 mm, less than 0.4 mm, and the inclination angle θ is 100°. The test verification results through the battery production line are shown in Table 1.

[0080] Comparative Example 5:

[0081] The adjacent edge spacing L1 of the two receiving grooves 203 is 10 mm, the depth H1 of the receiving groove 203 is 5 mm, and the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges in the length direction of the encapsulation film 2 is 100 mm. Then L1 / H1 = 2, L2 / H1 = 20. The dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 10 mm, the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 10 mm, and the spacing L4 between the first chamfer 102 and the second chamfer 204 is 10 mm. The radius R of the rounded corner is 7 mm, greater than 6 mm. The inclination angle θ is 150°. The test verification results through the battery production line are shown in Table 1.

[0082] Comparative Example 6:

[0083] The adjacent edge spacing L1 of the two receiving grooves 203 is 10 mm, the depth H1 of the receiving groove 203 is 5 mm, and the spacing L2 between the side edges of the receiving groove 203 in the length direction of the encapsulation film 2 and the side edges in the length direction of the encapsulation film 2 is 60 mm. Then L1 / H1 = 2, L2 / H1 = 12. The dimension L3 of the first chamfer 102 in the length direction of the encapsulation film 2 is 10 mm, the dimension W1 of the first chamfer 102 in the width direction of the encapsulation film 2 is 10 mm, and the spacing L4 between the first chamfer 102 and the second chamfer 204 is 10 mm. The radius R of the rounded corner is 5 mm, the inclination angle θ is 90°, less than 95°. The test verification results through the battery production line are shown in Table 1.

[0084] Table 1: Test Results

[0085]

[0086] As can be seen from Table 1, in Examples 1 to 5, 1 mm ≤ L1 ≤ 50 mm, 0.5 mm ≤ H1 ≤ 50 mm, 0.6 ≤ L1 / H1 ≤ 100, 2.5 mm ≤ L2 ≤ 100 mm, 5 ≤ L2 / H1 ≤ 50, 1 mm ≤ L3 ≤ 50 mm, 1 mm ≤ W1 ≤ 50 mm, 2 mm ≤ L4 ≤ 100 mm; when 0.5 mm ≤ H1 < 1 mm, 0.4 mm ≤ R < 1 mm; when 1 mm ≤ H1 < 5 mm, 1 mm ≤ R < 3 mm; when 5 mm ≤ H1 ≤ 50 mm, 3 mm ≤ R ≤ 6 mm; 95° ≤ θ ≤ 160°. Therefore, there is no abnormality after encapsulation, the encapsulation quality is high, and materials are saved.

[0087] In Comparative Example 1, L1 / H1 = 0.5, which is less than 0.6 and lower than the minimum value of the embodiments of the present invention. When punching the pit, the encapsulation film 2 ruptured, resulting in encapsulation failure.

[0088] In Comparative Example 2, L2 / H1 = 4, which is less than 5 and lower than the minimum value of the embodiments of the present invention. When heat melting, the heat-melt layer in the encapsulation area 3 shrank and the melt width was too narrow, resulting in sealing failure.

[0089] In Comparative Example 3, the distance L4 between the first chamfer 102 and the second chamfer 204 is 1 mm, which is less than 2 mm and lower than the minimum value of the embodiments of the present invention. When heat melting, the melt width in the encapsulation area 3 was too narrow, resulting in sealing failure.

[0090] In Comparative Example 4, H1 = 0.6 mm, and the radius R of the rounded corner is 0.3 mm, which is less than 0.4 mm and lower than the minimum value of the embodiments of the present invention. When punching the pit, the encapsulation film 2 ruptured, resulting in encapsulation failure.

[0091] In Comparative Example 5, H1 = 5 mm, and the radius R of the rounded corner is 7 mm, which is greater than 6 mm and exceeds the maximum value of the embodiments of the present invention. The arc interfered with the edge of the pole group 1 and collapsed the pole group 1, resulting in damage to the pole group 1 and short circuit.

[0092] In Comparative Example 6, the tilt angle θ = 90°, which is less than 95° and lower than the minimum value of the embodiments of the present invention. When punching the pit, the encapsulation film 2 ruptured, resulting in encapsulation failure.

[0093] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, including: a battery.

[0094] Since the battery pack includes a battery and has the same effects as the battery, it will not be described in detail here.

[0095] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A pole group, with a pole ear on one side; A packaging film, divided into a first sub-packaging film and a second sub-packaging film by a folding line, the first sub-packaging film and the second sub-packaging film are respectively concavely extended to form a receiving groove for receiving the electrode group, the second sub-packaging film is folded along the folding line and is opposite to and attached to the first sub-packaging film to cover the electrode group, and the first sub-packaging film and the second sub-packaging film are respectively provided with a packaging area surrounding the electrode group on the peripheral sides; The distance L1 between the adjacent edges of the two receiving grooves and the depth H1 of the receiving grooves satisfy 0.6≤L1 / H1≤100.

2. The battery according to claim 1, characterized in that The distance L1 between adjacent edges of the two receiving grooves satisfies, 1mm≤L1≤50mm, and the depth H1 of the receiving grooves satisfies, 0.5mm≤H1≤50mm.

3. The battery according to claim 2, characterized in that A distance L2 between the side edges of the receiving groove in the width direction of the packaging film and the side edges in the width direction of the packaging film satisfies 2.5 mm ≤ L2 ≤ 100 mm, and 5 ≤ L2 / H1 ≤ 50.

4. The battery according to any one of claims 1 to 3, characterized in that The packaging film is in the shape of a square sheet, and has first chamfers at four corners. The dimension L3 of the first chamfer in the length direction of the packaging film satisfies 1mm≤L3≤50mm, and the dimension W1 of the first chamfer in the width direction of the packaging film satisfies 1mm≤W1≤50mm.

5. The battery according to claim 4, characterized in that The cross-section of the accommodating groove is an inverted trapezoid, and second chamfers are provided at connecting corners of adjacent side walls of the accommodating groove respectively corresponding to the first chamfers, and a spacing L4 between the first chamfer and the second chamfer satisfies 2mm≤L4≤100mm.

6. The battery according to claim 5, characterized in that The second chamfer is a rounded corner, and the radius R of the rounded corner satisfies 0.4 mm ≤ R ≤ 6 mm.

7. The battery according to claim 6, characterized in that When 0.5mm≤H1<1mm, the radius R of the fillet satisfies, 0.4mm≤R<1mm; When 1mm≤H1<5mm, the radius R of the fillet satisfies, 1mm≤R<3mm; When 5mm≤H1≤50mm, the radius R of the fillet satisfies, 3mm≤R≤6mm.

8. The battery according to claim 4, characterized in that The packaging film is provided with notches at opposite ends of the folding line.

9. The battery according to any one of claims 1 to 3, characterized in that The groove wall of the receiving groove is inclined relative to the groove bottom, and the inclination angle θ satisfies 95°≤θ≤160°.

10. A battery pack, characterized in that: include: The battery according to any one of claims 1 to 9.

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