Battery

Abstract

The utility model discloses a battery which comprises a battery cell and a packaging body for packaging the battery cell, the packaging body comprises a main body part and a closed part, the closed part and the main body part are oppositely arranged along a first direction, the main body part comprises an open accommodating cavity and an edge sealing area surrounding the accommodating cavity, the battery cell is arranged in the accommodating cavity, and the edge sealing area is arranged in the accommodating cavity. The sealing part covers the main body part and is connected with the edge sealing area, the packaging body is provided with a first texture area, the first texture area comprises a plurality of texture structures, the accommodating cavity comprises a first cavity wall opposite to the opening, and the first cavity wall comprises at least part of the first texture area. According to the battery provided by the utility model, the packaging body before punching processing has the texture structure formed by pre-deformation, and in the punching processing process, the texture structure extends in the circumferential direction, so that the wall thickness of the formed packaging body is uniform, the reset stress effect of the outer layer of the packaging body is small, and the improvement of the yield of the battery is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery. Background Art

[0002] Aluminum-plastic film is a common battery packaging material. Through a stamping process, the film is formed into the outer membrane shell of the battery, protecting the battery cells within. During stamping, the film is placed flat on a stamping die. A stamping device applies a stamping force to the film, causing the stamped area to bulge, forming a shell with a cavity for the battery cells. Simultaneously, the stamping device also applies a pressure force around the stamped area of ​​the film to ensure a stable stamping process. To increase the energy density of the battery, the film must have a large stamping depth. However, excessively large stamping depths can significantly reduce the thickness of the stamped outer membrane shell at its corners, making the battery susceptible to breakage during use.

[0003] Furthermore, the outermost layer of existing aluminum-plastic film is a polymer layer. After the punching process is completed, the polymer layer has a certain reset stress. As the punching depth of the aluminum-plastic film increases, the reset stress of the outermost polymer layer of the aluminum-plastic film increases. Under the action of the reset stress, the shell rebounds and warps, which has a significant impact on the subsequent production steps of the battery, such as the battery cell shell insertion and edge sealing. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an embodiment of the present invention provides a battery, comprising a battery cell, and a package encapsulating the battery cell, the package comprising a main body and a closing portion, the closing portion being arranged opposite to the main body along a first direction, the main body comprising an open accommodating cavity and a sealing area surrounding the accommodating cavity, the battery cell being arranged in the accommodating cavity, the closing portion covering the main body and connected to the sealing area, the package having a first textured area comprising a plurality of textured structures, the accommodating cavity comprising a first cavity wall opposite to the opening, the first cavity wall comprising at least a portion of the first textured area.

[0005] The battery of the present invention, through the texture structure on the first textured area, causes the package to be pre-deformed before the punching process. During the punching process, the punching force acts on the textured area, and the pre-deformed textured area is circumferentially extended under the action of the punching force to form the package. Compared with the processing process of aluminum-plastic film in the prior art, the blanking force required to balance the punching force during the punching process is smaller, which can increase the punching depth and help improve the energy density of the battery. In addition, the thickness of the produced package is highly uniform, the stress concentration on the outermost polymer layer of the package is reduced, and the rebound effect is small, which helps to improve the pass rate of the punching process and reduce the impact on the battery production process.

[0006] In some embodiments, the surface roughness of the first textured area is greater than the surface roughness of the edge-sealed area.

[0007] In some embodiments, the surface roughness of the first textured area is 15 μm-200 μm; and / or the surface roughness of the edge-sealed area is 1 μm-8 μm.

[0008] According to some embodiments of the present invention, the depth H1 of the texture structure is 0.1 mm to 1.5 mm; and / or the width D of the texture structure (141) is 0.5 mm to 3 mm; and / or the distribution density of the texture structure in the first texture area is 9 to 25 per square centimeter.

[0009] In some embodiments, the width of the first textured area along the second direction is A, the width of the accommodating cavity along the second direction is a, and A and a satisfy: 0.5 mm ≤ Aa ≤ 4 mm; and / or;

[0010] The width of the first texture area along the third direction is B, the width of the accommodating cavity along the third direction is b, and B and b satisfy: 0.5mm≤Bb≤4mm;

[0011] The first direction, the second direction and the third direction are perpendicular to each other.

[0012] In some embodiments, there is one first texture region, and the area of ​​the first texture region is 10% to 50% of the area of ​​the package body.

[0013] In some embodiments, the accommodating cavity further includes two first side walls opposite to each other along the second direction, and two second side walls opposite to each other along the third direction, and the connection between the first cavity wall, the first side wall and the second side wall is smoothly transitioned to form a corner of the main body, and the wall thickness at the corner is 60%-85% of the thickness of the edge sealing area.

[0014] In some embodiments, the package body is further provided with a second textured region, and at least a portion of the structure of the second textured region constitutes the closed portion.

[0015] According to some embodiments of the present invention, the sealing portion includes a mating cavity, the mating cavity includes a second cavity wall opposite to the first cavity wall, and the second cavity wall includes at least a portion of the second textured area.

[0016] According to some embodiments of the present invention, the sum of the areas of the first texture region and the second texture region accounts for 70% to 98% of the area of ​​the package body.

[0017] According to some embodiments of the present invention, the ratio of the heights of the main body portion to the closing portion along the first direction is positively correlated with the ratio of the depths of the texture structures on the first texture area and the second texture area along the first direction.

[0018] According to some embodiments of the present invention, the package includes a heat-sealing layer, an intermediate layer and a protective layer stacked in sequence, the heat-sealing layer is located on the side of the package facing the battery core, and the texture structure includes a concave surface formed on one of the heat-sealing layer and the protective layer and a convex surface on the other.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic structural diagram of a battery package before punching in one embodiment of the present invention;

[0022] Figure 2 This is a schematic structural diagram of a battery package according to another embodiment of the present invention before punching;

[0023] Figure 3 This is a schematic structural diagram of the texture structure of the battery package according to an embodiment of the present utility model;

[0024] Figure 4 This is one of the schematic diagrams of the punching process of the package body having the first texture area according to an embodiment of the present utility model;

[0025] Figure 5 This is the second schematic diagram of the punching process of the package body having the first texture area according to an embodiment of the present invention;

[0026] Figure 6 This is one of the schematic diagrams of the punching process of the package body having the first texture area and the second texture area according to an embodiment of the present invention;

[0027] Figure 7 This is the second schematic diagram of the punching process of the package body having the first texture area and the second texture area according to the embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of measuring the warpage of the package after punching;

[0029] Figure 9This is a schematic structural diagram of a battery package according to an embodiment of the present invention;

[0030] Figure 10 This is a schematic structural diagram of a battery package according to another embodiment of the present invention;

[0031] Figure 11 It is a structural schematic diagram of a battery according to an embodiment of the present utility model.

[0032] Reference numerals:

[0033] 140a-first texture area; 140b-second texture area; 141-texture structure; 1411-concave surface; 1412-convex surface;

[0034] 200-package;

[0035] 210 - main body; 211 - accommodating cavity; 212 - first cavity wall;

[0036] 220 - closing portion; 221 - mating cavity; 222 - second cavity wall;

[0037] 230-Border area;

[0038] 300-battery;

[0039] 310-battery cell. DETAILED DESCRIPTION

[0040] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0041] To increase the energy density of batteries, aluminum-plastic film requires a larger punching depth. However, excessive punching depth results in the outer film shell being too thin at the corners, making the battery susceptible to breakage during use. Furthermore, the outermost layer of existing aluminum-plastic film is a polymer layer, which exhibits a certain amount of reset stress after the punching process. As the punching depth of the aluminum-plastic film increases, the reset stress of the outermost polymer layer increases. Under the influence of this reset stress, the shell rebounds, resulting in warping and deformation, which significantly impacts the subsequent battery production steps of cell shell insertion and edge sealing.

[0042] In view of this, an embodiment of the present invention provides a battery, in which the package body before punching has a texture structure formed by pre-deformation. During the punching process, the texture structure extends circumferentially, and the wall thickness of the formed package body is uniform. The reset stress effect of the outer layer of the package body is small, which is conducive to improving the yield rate of the battery.

[0043] For the convenience of description, the thickness direction of the battery can be the first direction, such as Figure 4 The Z direction shown, the width direction of the battery can be a second direction, such as Figure 5 The X direction shown, the length direction of the battery can be a third direction, such as Figure 5 In the Y direction shown, the first direction, the second direction and the third direction are perpendicular to each other.

[0044] Reference below Figures 1 to 11 , describing a battery 300 according to an embodiment of the present invention. Battery 300 can be a lithium-ion battery, a sodium-ion battery, or other types of batteries. Battery 300 can include a battery cell 310 and a package 200. Battery cell 310 can be a stacked core or a wound core. Package 200 is used to encapsulate battery cell 310.

[0045] The package body 200 may include a main body 210 and a closing portion 220. The closing portion 220 is arranged opposite to the main body 210 along a first direction. The main body 210 may include an open accommodating cavity 211 and a sealing area 230 surrounding the accommodating cavity 211. The battery cell 310 is arranged in the accommodating cavity 211. The closing portion 220 covers the opening of the main body 210 and is connected to the sealing area 230. In this way, an integrated battery 300 is formed.

[0046] The package body 200 may be provided with at least one textured area, and the textured area may include only the first textured area 140a, or the textured area may include the first textured area 140a and the second textured area 140b described later. When the textured area includes only the first textured area 140a, that is, the first textured area 140a is opposite to one side surface of the battery cell 310 along the thickness direction, that is, the first textured area 140a is opposite to only the upper surface or the lower surface of the battery cell 310. When the textured area includes the first textured area 140a and the second textured area 140b described later, the corresponding battery cell 310 along the thickness direction Figure 4 As shown in the Z direction, one of the two side surfaces, ie, the first texture area 140 a and the second texture area 140 b , faces the upper surface of the battery cell 310 , and the other faces the lower surface of the battery cell 310 .

[0047] The first textured area 140a includes a plurality of textured structures 141, and the accommodating cavity 211 includes a first cavity wall 212 opposite to the opening, and the first cavity wall 212 includes at least a portion of the first textured area 140a. In other words, the first textured area 140a may constitute a partial structure of the first cavity wall 212, or the first textured area 140a constitutes the first cavity wall 212, or alternatively, the area of ​​the first textured area 140a may exceed the first cavity wall 212, that is, the first textured area 140a constitutes the entire structure of the first cavity wall 212 and a partial structure of the first side wall and the second side wall of the accommodating cavity 211 described later.

[0048] The battery 300 of the present invention, through the texture structure 141 on the first textured area 140a, causes the package 200 to be pre-deformed before the punching process. During the punching process, the punching force acts on the first textured area 140a, and the pre-deformed first textured area 140a extends circumferentially under the action of the punching force to form the package 200. Compared with the processing process of aluminum-plastic film in the prior art, the blanking force required to balance the punching force during the punching process is small, which can increase the punching depth and help improve the energy density of the battery 300. In addition, the thickness of the produced package 200 is highly uniform, the stress concentration on the outermost polymer layer of the package 200 is small, and the rebound effect is small, which helps to improve the pass rate of the punching process and reduce the impact on the battery 300 production process.

[0049] Optionally, the edge sealing area 230 may include a top edge sealing structure and a side edge sealing structure. The top edge sealing structure is located on one side of the main body 210 along the length of the battery 300 in the second direction. It primarily serves to prevent leakage of electrolyte within the battery 300 and prevent external moisture from entering the battery 300. It also serves to electrically connect the battery 300 to an external circuit through the top edge sealing structure 230. The side edge sealing structure is located on at least one side of the main body 210 along the third direction. Specifically, there may be one side edge sealing structure located on one surface of the main body 210 along the third direction, or there may be two side edge sealing structures located on both sides of the main body 210 along the width direction of the third direction. The side edge sealing structure and the top edge sealing structure work together to seal the battery 300 package 200, prevent electrolyte leakage, and maintain a stable internal environment within the battery 300. The side edge sealing structures also provide support for the two side surfaces of the battery 300 along the width direction, enhancing the structural stability of the battery 300 and preventing deformation of the battery 300 under external forces.

[0050] According to some embodiments of the present invention, the surface roughness of the first textured region 140a is greater than the surface roughness of the edge-sealed region 230. Thus, after the battery cell 310 is encapsulated in the package body 200, the first textured region 140a contacts and faces one surface of the battery cell 310 along the thickness direction. The greater roughness of the first textured region 140a helps to increase the static friction between the first textured region 140a and the battery cell 310, thereby improving the package and fixation effect of the battery cell 310.

[0051] In some embodiments, the surface roughness of the first textured area 140a is 15 μm to 200 μm. For example, the surface roughness of the first textured area 140a can be 15 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, or 200 μm. Preferably, the surface roughness of the first textured area 140a can be 80 μm to 200 μm. Of course, the surface roughness of the first textured area 140a can also be other values, which can be selected by designers according to their needs, and this embodiment does not limit this.

[0052] By ensuring that the first textured area 140a has an appropriate roughness, the static friction between the battery cell 310 and the first cavity wall 212 is increased, thereby improving the fixation effect on the battery cell 310. On the one hand, it is preferable to avoid that the surface roughness of the first cavity wall 212 is too small, for example, less than 15 μm, which would result in poor fixation effect on the packaged battery cell 310 and lead to poor quality between products. On the other hand, it is preferable to avoid that the surface roughness of the first cavity wall 212 is too large, for example, exceeding 200 μm, which would reduce the fatigue resistance and corrosion resistance of the package 200 and make the package 200 easily damaged.

[0053] The surface roughness of the edge-sealed area 230 is 1-8 μm. For example, the surface roughness of the closed portion 220 can be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, or 8 μm. Of course, the surface roughness of the edge-sealed area 230 can also be other values, which can be selected by the designer according to their needs. This embodiment does not impose any restrictions on this.

[0054] The edge sealing area 230 is provided with an appropriate roughness. On the one hand, it is avoided that the surface roughness of the edge sealing area 230 is too small, for example, less than 1 μm, which makes the processing requirements of the package 200 high and leads to increased material costs; on the other hand, it is avoided that the surface roughness of the edge sealing area 230 is too large, for example, more than 8 μm, which leads to poor sealing effect between the edge sealing area 230 and the main body 210 when the battery cell 310 is bagged and packaged, thereby affecting the performance of the battery 300.

[0055] refer to Figure 3 In some embodiments, the depth H1 of the texture structure 141 can be 0.1 mm to 1.5 mm. For example, H1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or 1.5 mm. Of course, the depth H1 of the texture structure 141 can also be other sizes, and designers can choose according to their needs. This embodiment does not limit this.

[0056] The depth H1 of the texture structure 141 is of an appropriate size. On the one hand, it is necessary to avoid the depth H1 of the texture structure 141 being too small, for example, when it is less than 0.1 mm, the pre-deformation of the package 200 is too small, and the texture structure 141 cannot be expanded circumferentially during the punching process to make the wall thickness of the package 200 uniform. On the other hand, it is necessary to avoid the depth H1 of the texture structure 141 being too large, for example, when it is greater than 1.5 mm, indentations may be left on the molded package 200, resulting in poor appearance.

[0057] Continue to refer Figure 3 In some embodiments, the width D of the texture structure 141 is 0.5 mm to 3 mm. For example, the width D of the texture structure 141 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm. Of course, the width D of the texture structure 141 can also be other sizes, and designers can choose according to their needs. This embodiment does not limit this.

[0058] The texture structure 141 has a suitable width D. On the one hand, it is to avoid that the width of the texture structure 141 is too small, for example, when it is less than 0.5 mm, it will be flattened after a period of time after the punching, resulting in little effect on improving the ductility of the package 200; on the other hand, it is to avoid that the width of the texture structure 141 is too large, for example, when it exceeds 3 mm, after the package 200 is punched to form the package 200, there will still be a significantly protruding texture structure 141, affecting the aesthetics of the battery 300.

[0059] In some embodiments, the first distribution density of the texture structure 141 is 9-25 / square centimeter. For example, the first distribution density of the texture structure 141 can be 9 / square centimeter, 10 / square centimeter, 11 / square centimeter, 12 / square centimeter, 13 / square centimeter, 14 / square centimeter, 15 / square centimeter, 16 / square centimeter, 17 / square centimeter, 18 / square centimeter, 19 / square centimeter, 20 / square centimeter, 21 / square centimeter, 22 / square centimeter, 23 / square centimeter, 24 / square centimeter or 25 / square centimeter.

[0060] The texture structure 141 has a suitable distribution density. On the one hand, it is avoided that the distribution density of the texture structure 141 at the first stage is too small, for example, less than 9 per square centimeter, so that the pre-deformation of the package 200 is too small, and the effect of improving the ductility of the package 200 is small. On the other hand, it is avoided that the distribution density of the texture structure 141 at the first stage is too large, for example, greater than 25 per square centimeter, so that after the package 200 is punched and formed, there is still a significantly protruding texture structure 141, which affects the aesthetics of the battery 300.

[0061] refer to Figure 5 In some embodiments, the first width along the second direction is A, and the width of the first cavity wall 212 along the second direction is a. A and a satisfy the following relationship: 0.5 mm ≤ Aa ≤ 4 mm. For example, the value of Aa can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm. Of course, the difference between the first width A along the second direction and the width a of the first cavity wall 212 along the second direction can also be other values. Designers can select this value based on their needs, and this embodiment does not impose any restrictions on this.

[0062] The first width along the third direction is B, and the width of the first cavity wall 212 along the third direction is b. B and b satisfy the following conditions: 0.5 mm ≤ Bb ≤ 4 mm. For example, the value of Bb can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm. Of course, the difference between the first width B along the third direction and the width b of the first cavity wall 212 along the third direction can also be other values. Designers can choose according to their needs, and this embodiment does not impose any restrictions on this. The first direction, the second direction, and the third direction are perpendicular to each other.

[0063] By limiting the numerical relationship between the first cavity wall 212 and the width of the first cavity wall along the second direction and the third direction respectively, the corresponding relationship between the first cavity wall 212 and the area formed after punching is determined. On the one hand, it can avoid the first area being too small, so that part of the non-first texture area on the package body 200 is punched into the main body 210, and the uniformity of the molded package body 200 is poor, which makes the battery 300 easy to damage; on the other hand, it can avoid the first area being too large, so that part of the first cavity wall 212 is not punched, which makes the battery 300 have a poor appearance.

[0064] In some embodiments, when the textured area includes only the first textured area 140a, the area of ​​the first textured area 140a may be 10% to 50% of the area of ​​the package body 200. For example, the first area may account for 10%, 20%, 30%, 40%, or 50% of the area of ​​the package body 200. Of course, the ratio of the first area to the area of ​​the package body 200 may also be other values, which can be selected by designers according to their needs, and this embodiment does not impose any limitation on this.

[0065] The ratio of the first area to the area of ​​the package body 200 is set to an appropriate value. On the one hand, it is to avoid that the first area accounts for too small a ratio of the package body 200, for example, less than 10%, which may result in part of the edge sealing area 230 of the package body 200 being punched out to form the main body 210, resulting in poor uniformity of the formed package body 200 and easy damage to the battery 300. On the other hand, it is to avoid that the first area accounts for too large a ratio of the package body 200, for example, more than 50%, which may result in part of the first area not being punched out, resulting in a poor appearance of the battery 300, and further resulting in the appearance of textured structure 141 on the edge sealing area 230, resulting in poor edge sealing, poor sealing of the battery 300, and easy entry of water vapor into the battery 300, causing battery 300 failure.

[0066] In some embodiments, the accommodating cavity 211 further includes two first sidewalls opposing each other along the second direction and two second sidewalls opposing each other along the third direction. The junctions between the first cavity wall 212, the first sidewall, and the second sidewall are smoothly rounded to form the corners of the main body 210. Conventional aluminum-plastic film, when punched, exhibits significant wall thickness reduction at the four corners corresponding to the first cavity wall 212 of this embodiment, making the battery 300 susceptible to damage at these corners. Because the package body 200 includes the textured structure 141, it has a certain amount of pre-deformation. This reduces the thickness reduction at the four corners of the main body 210 formed during punching, resulting in a more uniform wall thickness. The wall thickness at the corners is 60% to 85% of the thickness of the edge-sealed region 230. For example, the wall thickness at the corners of the main body 210 can be 60%, 65%, 70%, 75%, 80%, or 85% of the thickness of the edge-sealed region 230. Of course, the ratio of the wall thickness at the corner of the main body 210 to the thickness of the package body 200 can also be other values, and designers can choose according to needs. This embodiment does not impose any limitation on this.

[0067] The corners of the main body 210 have an appropriate thickness to avoid the thickness of the corners of the main body 210 being too thin, for example, less than 60% of the thickness of the package 200. During long-term charging and discharging of the battery 300, cracks may occur at the corners, causing the battery 300 to leak and fail.

[0068] In some embodiments, the package body 200 includes a second textured region 140b, which also has a textured structure 141. When the package body 200 includes both the first textured region 140a and the second textured region 140b, at least a portion of the second textured region 140b forms the enclosed portion 220. In this manner, the first textured region 140a and the second textured region 140b contact the battery cell 310 from both sides along the thickness direction of the battery cell 310, effectively securing the battery cell 310.

[0069] According to an embodiment of the present invention, the sealing portion 220 includes a mating cavity 221. The mating cavity 221 may be formed by the sealing portion 220 protruding along a first direction away from the first cavity wall 212. The mating cavity 221 includes a second cavity wall 222 opposite the first cavity wall 212. The second cavity wall 222 includes at least a portion of the second textured area 140b. The distribution of the second textured area 140b can refer to the distribution of the first textured area 140a on the first cavity wall 212, and will not be described in detail here. This provides a large space for accommodating the battery cell 310, which is beneficial for improving the energy density of the battery 300.

[0070] According to some embodiments of the present invention, the sum of the areas of the first textured region 140a and the second textured region 140b accounts for 70% to 98% of the area of ​​the package 200. For example, the sum of the areas of the first textured region 140a and the second textured region 140b may account for 70%, 75%, 80%, 85%, 90%, 95%, or 98% of the area of ​​the package 200. Preferably, the sum of the areas of the first textured region 140a and the second textured region 140b may account for 80% to 98% of the area of ​​the package 200. Of course, the ratio of the sum of the areas of the first textured region 140a and the second textured region 140b to the area of ​​the package 200 may also be other values, which can be selected by designers according to their needs and are not limited in this embodiment.

[0071] The sum of the areas of the first textured region 140a and the second textured region 140b as a percentage of the area of ​​the package 200 is appropriately determined. This avoids a situation where the sum of the areas of the first textured region 140a and the second textured region 140b as a percentage of the area of ​​the package 200 is too small, for example, less than 70%, which would result in a portion of the edge sealing region 230 of the package 200 being punched out to form the main body 210, resulting in poor uniformity in the formed package 200 and susceptibility to damage of the battery 300. Furthermore, it avoids a situation where the sum of the areas of the first textured region 140a and the second textured region 140b as a percentage of the area of ​​the package 200 is too large, for example, exceeding 98%, which would result in a portion of the first textured region 140a or the second textured region 140b not being punched out, resulting in a poor appearance of the battery 300.

[0072] It can be understood that the ratio of the sum of the areas of the first texture area 140a and the second texture area 140b to the area of ​​the package body 200 here refers to the ratio of the sum of the areas of the first texture area 140a and the second texture area 140b on the package body 200 before the punching process to the unfolded area of ​​the package body 200 formed by the punching process. During the punching process, an air bag structure (not shown in the figure) will be formed on the package body 200. When the product is processed, the air bag structure is cut off.

[0073] Understandably, reference Figure 8Under the same punching parameters of punching force and punching depth, the warping deformation h of the package body 200 after punching is measured. The warping deformation h of the package body 200 of this embodiment is smaller than the warping deformation of the package body punched out of the aluminum-plastic film without a textured area.

[0074] According to some embodiments of the present invention, the ratio of the height of the main body 210 to the closed portion 220 along the first direction is positively correlated with the ratio of the depth of the texture structure 141 on the first texture area 140a and the second texture area 140b along the first direction. In other words, since the punching depth of the accommodating cavity 211 formed by the punching of the main body 210 and the punching depth of the matching cavity 221 formed by the punching of the closed portion 220 are different, the ratio of the height of the main body 210 to the closed portion 220 along the first direction can be equal to the ratio of the depth of the texture structure 141 on the first texture area 140a and the second texture area 140b along the first direction. In this way, the pressure consistency of the package 200 can be improved. When the battery 300 is subjected to external pressure, the pressure is more evenly distributed on the package 200, thereby improving the stability of the battery 300 structure.

[0075] In some embodiments, the package 200 may include a heat-sealing layer, an intermediate layer, and a protective layer stacked in sequence, with the heat-sealing layer facing the battery cell 310. The intermediate layer may be an aluminum metal layer to provide structural support. The heat-sealing layer constitutes a first surface, which is used to heat-melt-seal the edge sealing structure around the battery cell 310 after the package 200 wraps the battery cell 310. The protective layer constitutes a second surface, which is used to protect the outer surface of the aluminum metal layer to prevent scratches and punctures and to achieve insulation. The protective layer can be a single layer, or it can be multiple layers. Designers can set it according to needs, and the present invention does not limit this. The heat-sealing layer is on the side of the package 200 facing the battery cell 310. In other words, the texture structure 141 can be formed by the heat-sealing layer being recessed into the protective layer, or the protective layer can be recessed into the heat-sealing layer to form the texture structure 141. In this way, the processing steps for forming the texture structure 141 on the package 200 are simple and convenient.

[0076] The texture 141 may include a concave surface 1411 formed on one of the heat seal layer and the protective layer, and a convex surface 1412 formed on the other. For example, the texture 141 may include the concave surface 1411 formed on the heat seal layer and the convex surface 1412 formed on the protective layer, or the texture 141 may include the convex surface 1412 formed on the heat seal layer and the concave surface 1411 formed on the protective layer. It is understood that the outer surface of the package 200 with the heat seal layer may be the first surface, and the outer surface of the package 200 with the protective layer may be the second surface. When stamping is performed from the first surface toward the second surface, the concave surface of the texture 141 is formed on the heat seal layer, and the convex surface 1412 of the texture 141 is formed on the protective layer. When stamping is performed from the second surface toward the first surface, the convex surface 1412 of the texture 141 is formed on the heat seal layer, and the concave surface 1411 of the texture 141 is formed on the protective layer.

[0077] The texture structure 141 of this embodiment can be formed by extruding a mold having a corresponding structure on the package body 200. In this way, the depth of the concave surface 1411 is the same as the height of the convex surface 1412, and the width of the concave surface 1411 is the same as the width of the convex surface 1412. The convex surface 1412 can be a circular convex surface 1412 or an elliptical convex surface 1412. The texture structure 141 is used to give the package body 200 a certain amount of pre-deformation. It can be understood that when the mold having the corresponding structure is used to stamp the package body 200, the edge sealing area 230 shrinks toward the stamping area to form the texture structure 141. In this way, during the stamping process, the texture structure 141 is expanded circumferentially, the stress concentration is small, and the stamping process is more convenient.

[0078] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0079] In the description of the present invention, "first feature" and "second feature" may include one or more such features.

[0080] In the description of the present invention, “plurality” means two or more.

[0081] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact via another feature therebetween.

[0082] In the description of the present invention, a first feature “above”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0083] Other components of ... according to the embodiment of the present invention, such as ... and ..., and operations are known to those skilled in the art and will not be described in detail here.

[0084] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0085] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery (300), characterized in that: The invention comprises a battery cell (310) and a package body (200) for packaging the battery cell (310), wherein the package body (200) comprises a main body (210) and a sealing portion (220), wherein the sealing portion (220) and the main body (210) are arranged relative to each other along a first direction, wherein the main body (210) comprises an open accommodating cavity (211) and a sealing edge region (230) surrounding the accommodating cavity, wherein the battery cell (310) is arranged in the accommodating cavity (211), and the sealing portion (220) covers the main body (210) and is connected to the sealing edge region (230). The package body (200) is provided with a first textured area (140a), the first textured area (140a) includes a plurality of texture structures (141), the accommodating cavity (211) includes a first cavity wall (212) opposite to the opening, and the first cavity wall (212) includes at least a portion of the first textured area (140a).

2. The battery (300) according to claim 1, characterized in that The surface roughness of the first textured area (140a) is greater than the surface roughness of the edge sealing area (230).

3. The battery (300) according to claim 2, characterized in that The surface roughness of the first textured area (140a) is 15 μm-200 μm; And / or, the surface roughness of the edge sealing area (230) is 1 μm-8 μm.

4. The battery (300) according to claim 1, characterized in that The depth H1 of the texture structure (141) is 0.1 mm to 1.5 mm; and / or, the width D of the texture structure (141) is 0.5 mm to 3 mm; And / or, the distribution density of the texture structure (141) in the first texture area (140a) is 9-25 per square centimeter.

5. The battery (300) according to claim 1, characterized in that The width of the first textured area (140a) along the second direction is A, the width of the accommodating cavity (211) along the second direction is a, and A and a satisfy: 0.5mm≤Aa≤4mm; and / or; The width of the first textured area (140a) along the third direction is B, the width of the accommodating cavity (211) along the third direction is b, and B and b satisfy: 0.5mm ≤ Bb ≤ 4mm; The first direction, the second direction and the third direction are perpendicular to each other.

6. The battery (300) according to claim 1, characterized in that There is one first textured region (140a), and the area of ​​the first textured region (140a) is 10% to 50% of the area of ​​the package (200).

7. The battery (300) according to claim 1, characterized in that The accommodating cavity (211) further comprises two first side walls opposite to each other along the second direction, and two second side walls opposite to each other along the third direction, wherein the connection between the first cavity wall, the first side wall and the second side wall is smoothly transitioned to form the corner of the main body (210). The wall thickness at the corner is 60%-85% of the thickness of the edge sealing area (230).

8. The battery (300) according to claim 1, characterized in that The package body (200) is further provided with a second textured area (140b), and at least a part of the structure of the second textured area (140b) constitutes the closed portion (220).

9. The battery (300) according to claim 8, characterized in that The closing portion (220) includes a matching cavity (221), the matching cavity (221) includes a second cavity wall (222) opposite to the first cavity wall (212), and the second cavity wall (222) includes at least a portion of the second textured area (140b).

10. The battery (300) according to claim 9, characterized in that The sum of the areas of the first textured region (140a) and the second textured region (140b) accounts for 70% to 98% of the area of ​​the package (200).

11. The battery (300) according to claim 9, characterized in that The ratio of the heights of the main body portion (210) and the closed portion (220) along the first direction is positively correlated with the ratio of the depths of the texture structures (141) on the first texture area (140a) and the second texture area (140b) along the first direction.

12. The battery (300) according to claim 1, characterized in that The package (200) comprises a heat-sealing layer, an intermediate layer, and a protective layer stacked in sequence, the heat-sealing layer being located on a side of the package (200) facing the battery core (310), and the texture structure (141) comprising a concave surface (1411) formed on one of the heat-sealing layer and the protective layer, and a convex surface (1412) formed on the other.

Images