Battery and electric device

Abstract

This application discloses a battery and an electrical device. The battery includes an electrode assembly, tabs, and a packaging bag. The electrode assembly has an inclined wall, which is set at an obtuse angle relative to both the first and second side walls, so that a notch is formed on the side of the inclined wall facing away from the electrode assembly. The tab includes a tab body and tab adhesive, which is disposed along the extension direction of the inclined wall, which extends from the connection point between the inclined wall and the first side wall to the connection point between the inclined wall and the second side wall. The packaging bag includes a packaging body and a first sealing part, a second sealing part, and a third sealing part. The third sealing part is disposed on the inclined wall and is disposed along the extension direction of the inclined wall. The tab adhesive connects to the third sealing part. The first sealing part is bent towards the packaging body to form a first bent part. This application can save the space occupied by the lead-out edge of the tab at the battery head and the packaging bag, and can also save the space occupied by the sealing part with the widest sealing space in the length and width directions of the battery, as well as the space occupied by the battery head packaging.

Description

Technical Field

[0001] This application relates to the field of battery equipment technology, and more particularly to a battery and an electrical device. Background Technology

[0002] During the battery packaging process, the seal of the outer packaging bag is usually folded to save packaging space. However, in related technologies, because the battery needs to have tabs at the top that pass through the seal of the top of the packaging bag, the top seal cannot be folded due to the tab design, resulting in wasted battery space. Summary of the Invention

[0003] This application provides a battery and an electrical device to improve the problem in related technologies where the top seal of the packaging bag cannot be folded, resulting in wasted battery space.

[0004] This application provides a battery, including:

[0005] The electrode assembly has a first sidewall, a second sidewall adjacent to the first sidewall, and an inclined wall connecting the first sidewall and the second sidewall. The inclined wall is set at an obtuse angle relative to both the first sidewall and the second sidewall, so that a notch is formed on the side of the inclined wall away from the electrode assembly.

[0006] The electrode includes an electrode body and an electrode adhesive connecting the electrode body. One end of the electrode body is electrically connected to an electrode assembly, and the other end of the electrode body protrudes from the electrode assembly through a notch. The electrode adhesive is provided along the extension direction of the inclined wall, which is the direction from the connection between the inclined wall and the first side wall to the connection between the inclined wall and the second side wall.

[0007] The packaging bag includes a packaging body and a first sealing part, a second sealing part, and a third sealing part connected to the packaging body. The electrode assembly is located inside the packaging body. The first sealing part is disposed on a first side wall, the second sealing part is disposed on a second side wall, and the third sealing part is disposed on an inclined wall. The third sealing part is connected between the first sealing part and the second sealing part and is disposed along the extension direction of the inclined wall. The tab adhesive connects the third sealing part. The first sealing part is bent toward the direction close to the packaging body to form a first bent part.

[0008] In this embodiment of the battery, the tab body is designed to protrude from the electrode assembly through a notch. Compared to related technologies where the tab body protrudes from the second sidewall at the top of the electrode assembly, this design shifts the gap between the tab lead-out edge and the packaging bag from the top of the electrode assembly to the notch at the corner of the electrode assembly. This allows the distance between the tab lead-out edge and the packaging bag to be integrated within the length of the electrode assembly, saving space occupied by the gap between the tab lead-out edge and the packaging bag at the battery head. Furthermore, shifting the tab body from protruding from the second sidewall at the top of the electrode assembly to protruding through a notch allows the widest and most space-consuming sealing portion to be placed at the corner during packaging, saving space occupied in both the length and width directions of the battery.

[0009] The design of both the tab adhesive and the third sealing part is arranged along the extension direction of the inclined wall, which allows the third sealing part to be set at an obtuse angle relative to both the first and second sealing parts. This allows both the first and second sealing parts to be bent toward the direction of the packaging body. Compared with related technologies where only the first sealing part can be bent toward the direction of the packaging body while the second sealing part cannot be bent toward the direction of the packaging body, this design can save the space occupied by the battery head packaging.

[0010] In summary, the embodiments of this application can save the space occupied by the lead-out edge of the battery head tab and the packaging bag, save the space occupied by the sealing part with the widest sealing part in the length and width directions of the battery during the sealing process, and also save the space occupied by the battery head packaging.

[0011] In some embodiments, the second sealing portion is bent towards the packaging body to form a second bend, and the second bend fits into the packaging body.

[0012] Based on the above embodiments, the space occupied by the battery in its length direction can be reduced.

[0013] In some embodiments, the first bend fits into the main body of the packaging.

[0014] Based on the above embodiments, the space occupied by the battery in its width direction can be reduced.

[0015] In some embodiments, along the width direction of the electrode assembly, the tab adhesive is located on the side of the first sealing portion near the bend line of the electrode assembly.

[0016] Based on the above embodiments, it is possible to ensure that the tab adhesive does not extend beyond the packaging bag in the width direction of the electrode assembly, thus preventing an increase in the size of the battery in its width direction.

[0017] In some embodiments, along the length of the electrode assembly, the tab adhesive is located on the side of the second seal portion near the bend line of the electrode assembly.

[0018] Based on the above embodiments, it is possible to ensure that the tab adhesive does not extend beyond the packaging bag in the length direction of the electrode assembly, thus preventing an increase in the size of the battery in its length direction.

[0019] In some embodiments, the tab adhesive has a first surface and a second surface opposite each other along an extension direction perpendicular to the inclined wall, wherein the first surface is parallel to the inclined wall.

[0020] In some embodiments, the second face is parallel to the inclined wall.

[0021] In some embodiments, the tab adhesive has a first side and a second side opposite each other along an extension direction perpendicular to the inclined wall, wherein the first side extends into the packaging body.

[0022] Based on the above embodiments, the tab adhesive is sealed to the third sealing part at least near the inner edge of the third sealing part, thereby achieving a seal of the tab body at least near the inner edge of the third sealing part.

[0023] In some of these embodiments, the second side protrudes beyond the packaging bag.

[0024] Based on the above embodiments, the tab adhesive is sealed to the third sealing part at least near the outer edge of the third sealing part, thereby achieving a seal of the tab body at least near the outer edge of the third sealing part.

[0025] In some embodiments, the tab adhesive has a third and a fourth surface opposite each other along the extension direction of the inclined wall, wherein the third surface is parallel to the first sidewall; and / or, the fourth surface is parallel to the first sidewall.

[0026] Based on the above embodiments, the regularity of the structure of the third and fourth sides is conducive to the design of the anti-interference distance between the fourth side and the first sealing part.

[0027] In some embodiments, the tab adhesive has a third and a fourth surface opposite each other along the extension direction of the inclined wall, wherein the third surface is spaced apart from both the first sealing portion and the second sealing portion.

[0028] Based on the above embodiments, the third side of the tab adhesive can be made to avoid interference with the first and second sealing parts, which is beneficial for the sealing of the packaging bag.

[0029] In some embodiments, the fourth surface is spaced apart from both the first sealing portion and the second sealing portion.

[0030] Based on the above embodiments, the fourth side of the tab adhesive can be made to avoid interference with the first and second sealing parts, which is beneficial for the sealing of the packaging bag.

[0031] In some embodiments, the tab body extends along the extension direction of the first sidewall.

[0032] Based on the above embodiments, it is beneficial to carry out subsequent assembly and other processes.

[0033] In some embodiments, the electrode assembly has two first sidewalls and two inclined walls. The two first sidewalls are located on both sides of the electrode assembly in the width direction. Each first sidewall is connected to a second sidewall through an inclined wall. Each inclined wall has a notch formed on the side facing away from the electrode assembly.

[0034] The battery includes two tabs, each with two notches protruding from the electrode assembly, and the tab adhesive of each tab is inclined along the extension direction of the corresponding inclined wall.

[0035] The packaging bag includes two first sealing parts and two third sealing parts. The two first sealing parts are respectively disposed on two first side walls, and the two third sealing parts are respectively disposed on two inclined walls. Each third sealing part is connected between a first sealing part and a second sealing part and is disposed along the extension direction of the corresponding inclined wall. The tab adhesive of the two tabs is respectively connected to the two third sealing parts.

[0036] In some embodiments, the electrode assembly includes:

[0037] Multiple electrode sheets are stacked together. Each electrode sheet is provided with a clearance opening and a bevel. The clearance opening is provided on one of the two beveled walls, and the bevel is provided on the other of the two beveled walls. Each electrode sheet has a first region covered by an active layer and a second region not covered by an active layer. The second region is located closer to the bevel than the first region. The clearance opening is used to avoid the second region of adjacent electrode sheets.

[0038] All the second regions corresponding to the same inclined wall are connected as one unit and electrically connected to the electrode body of one electrode.

[0039] Based on the above embodiments, the avoidance openings and bevels of two adjacent electrodes are designed to be staggered, which helps to distinguish the two adjacent electrodes so that they can be electrically connected to different tabs.

[0040] In some embodiments, the boundary lines of the first and second regions are parallel to the inclined wall.

[0041] Based on the above embodiments, the structural regularity of the second region is beneficial for electrical connection with the electrode tab.

[0042] In some embodiments, the battery satisfies the following condition:

[0043] W5*(L1+ L2)>2* (H1+ sinθ*(W1+W2+ W3- W4)) 2 * / tanθ

[0044] Wherein, θ is the angle between the extension of the second sidewall and the inclined wall, 0 < θ < 90°; H1 is the distance from the boundary line between the first and second regions to the second surface of the tab adhesive away from the electrode assembly, in mm; W1 is the width of the tab body along the extension direction of the second sidewall, in mm; W2 is the width of the tab adhesive between the tab body and the fourth surface of the tab adhesive near the first seal portion along the extension direction of the second sidewall, in mm; W3 is the anti-interference distance between the tab adhesive and the first seal portion along the extension direction of the second sidewall, in mm; W4 is the distance between the electrode assembly and the first seal portion along the extension direction of the second sidewall, in mm; W5 is the width of the electrode assembly along the extension direction of the second sidewall, in mm; L1 is the reduction in the distance between the electrode assembly and the second seal portion along the extension direction of the first sidewall, in mm; L2 is the dimension of the second bend of the second seal portion along the extension direction of the first sidewall, in mm.

[0045] Based on the above embodiments, by adjusting the angle between the extension line of the second sidewall and the inclined wall, the area lost by the electrode assembly in this application embodiment can be changed, thereby saving space overall and improving the ED effect of the battery.

[0046] In some embodiments, the battery satisfies the following condition:

[0047] 16.7° < θ < 45°

[0048] Where θ is the angle between the extension of the second sidewall and the inclined wall.

[0049] Based on the above embodiments, by reasonably limiting the angle between the extension line of the second sidewall and the inclined wall, the design difficulty of the battery can be simplified, thereby improving the battery's energy efficiency.

[0050] Secondly, embodiments of this application also provide an electrical device, including the battery described above.

[0051] The electrical device in this application embodiment includes the battery described above. Therefore, it has the beneficial effects of the battery described above. That is, it can save the space occupied by the lead-out edge of the battery head tab and the packaging bag, save the space occupied by the sealing part with the widest sealing space in the length and width directions of the battery, and save the space occupied by the battery head packaging. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A cross-sectional structural diagram of a battery provided in one embodiment of this application;

[0054] Figure 2 yes Figure 1 A schematic diagram of a partial three-dimensional structure of the battery is shown;

[0055] Figure 3 This is a partial cross-sectional structural diagram of a battery provided in another embodiment of this application;

[0056] Figure 4 This is a partial structural schematic diagram of an electrode assembly in a battery provided in another embodiment of this application;

[0057] Figure 5 yes Figure 4 The diagram shows the exploded structure of the electrode assembly;

[0058] Figure 6 This is a cross-sectional structural diagram of a battery provided in another embodiment of this application;

[0059] Figure 7 This is a partial cross-sectional structural diagram of a battery provided in another embodiment of this application.

[0060] Explanation of reference numerals in the attached figures:

[0061] 1. Battery;

[0062] 10. Electrode assembly; 11. First sidewall; 12. Second sidewall; 13. Sloping wall; 14. Notch; 15. Electrode; 15a. Electrode; 15b. Electrode; 151. First region; 152. Second region; 152a. Second region; 152b. Second region; 153. Clearance opening; 153a. Clearance opening; 153b. Clearance opening; 154. Hydrate; 154a. Hydrate; 154b. Hydrate; 155. Boundary line;

[0063] 20. Electrode; 21. Electrode body; 22. Electrode adhesive; 221. First side; 222. Second side; 223. Third side; 224. Fourth side;

[0064] 30. Packaging bag; 31. Packaging body; 32. First seal; 321. First bend; 33. Second seal; 331. Second bend; 34. Third seal; 35. Fourth seal;

[0065] x, length direction; y, width direction; z, thickness direction. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0067] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0068] Please see Figure 1 and Figure 2 , Figure 1 This is a cross-sectional structural diagram of a battery provided in one embodiment of this application. Figure 2 yes Figure 1 A schematic diagram of a partial three-dimensional structure of the battery is shown. (See attached diagram.) Figure 1 and Figure 2 As shown, battery 1 includes an electrode assembly 10, a tab 20, and a packaging bag 30. The electrode assembly 10 is disposed inside the packaging bag 30. One end of the tab 20 is electrically connected to the electrode assembly 10 inside the packaging bag 30, and the other end of the tab 20 extends out of the packaging bag 30. The portion of the tab 20 extending out of the packaging bag 30 is configured to be electrically connected to an electronic device.

[0069] See Figure 2 and Figure 3 , Figure 3 This is a partial cross-sectional structural diagram of a battery provided in another embodiment of this application. For example... Figure 2 and Figure 3As shown, the electrode assembly 10 has a first sidewall 11, a second sidewall 12 adjacent to the first sidewall 11, and an inclined wall 13 connecting the first sidewall 11 and the second sidewall 12. The inclined wall 13 is set at an obtuse angle relative to both the first sidewall 11 and the second sidewall 12, so that a notch 14 is formed on the side of the inclined wall 13 facing away from the electrode assembly 10. The tab 20 includes a tab body 21 and a tab adhesive 22 connecting the tab body 21. One end of the tab body 21 is electrically connected to the electrode assembly 10, and the other end of the tab body 21 protrudes from the electrode assembly 10 through the notch 14. The tab adhesive 22 is set along the extension direction of the inclined wall 13. The extension direction of the inclined wall 13 is from the connection point of the inclined wall 13 and the first sidewall 11 to the connection point of the inclined wall 13 and the second sidewall 12. In some prior art, the long side direction of the tab adhesive 22 is set to be parallel to the second sidewall 12, which makes it impossible to make the inclined wall 13 set at an obtuse angle with the first sidewall 11 and the second sidewall 12. The packaging bag 30 includes a packaging body 31 and a first sealing part 32, a second sealing part 33, and a third sealing part 34 connected to the packaging body 31. The electrode assembly 10 is located inside the packaging body 31. The first sealing part 32 is disposed on the first side wall 11, the second sealing part 33 is disposed on the second side wall 12, and the third sealing part 34 is disposed on the inclined wall 13. The third sealing part 34 is connected between the first sealing part 32 and the second sealing part 33 and is disposed along the extension direction of the inclined wall 13. The tab adhesive 22 is connected to the third sealing part 34. The first sealing part 32 is bent toward the direction closer to the packaging body 31 to form a first bent part 321, and the second sealing part 33 is bent toward the direction closer to the packaging body 31 to form a second bent part 331.

[0070] In the above design, the tab body 21 protrudes from the electrode assembly 10 through the notch 14. Compared to related technologies where the tab body protrudes from the second sidewall at the top of the electrode assembly, this design shifts the gap between the tab lead-out edge and the packaging bag from the top of the electrode assembly to the notch 14 at the corner of the electrode assembly 10. This allows the distance between the lead-out edge of the tab 20 and the packaging bag 30 to be integrated into the length direction of the electrode assembly 10, saving space occupied by the gap between the lead-out edge of the tab 20 and the packaging bag 30 at the head of the battery 1. Furthermore, shifting the tab body 21 from protruding from the second sidewall at the top of the electrode assembly to protruding through the notch 14 allows the widest and most space-consuming sealing portion to be placed at the corner during packaging, saving space occupied by the tab in both the length and width directions of the battery 1.

[0071] The aforementioned design, where the tab adhesive 22 and the third sealing part 34 are both arranged along the extension direction of the inclined wall 13, allows the third sealing part 34 to be set at an obtuse angle relative to the first sealing part 32 and the second sealing part 33. This enables both the first sealing part 32 and the second sealing part 33 to be bent toward the direction closer to the packaging body 31. Compared to related technologies where only the first sealing part bends toward the direction closer to the packaging body while the second sealing part cannot be bent toward the direction closer to the packaging body, this design saves space occupied by the battery head packaging.

[0072] In summary, the embodiments of this application can save the space occupied by the lead-out edge of the tab 20 at the head of the battery 1 and the packaging bag 30, and can also save the space occupied by the sealing part with the widest sealing part in the length and width directions of the battery 1 during the sealing process, as well as save the space occupied by the head of the battery 1 during the sealing process.

[0073] For ease of description, an example is provided where the first sidewall 11 extends along the length direction x of the electrode assembly 10, and the second sidewall 12 extends along the width direction y of the electrode assembly 10. The length direction x of the electrode assembly 10 corresponds to the length direction of the battery 1, the width direction y of the electrode assembly 10 corresponds to the width direction of the battery 1, and the thickness direction z of the electrode assembly 10 corresponds to the thickness direction of the battery 1.

[0074] For the aforementioned electrode assembly 10, see [link to documentation]. Figure 2 It has two first sidewalls 11 and two inclined walls 13. The two first sidewalls 11 are located on both sides of the electrode assembly 10 in the width direction y. Each first sidewall 11 is connected to a second sidewall 12 through an inclined wall 13. Each inclined wall 13 has a notch 14 on the side facing away from the electrode assembly 10, and each notch 14 is used to set an electrode tab 20. The above design places the two inclined walls 13 at the head of the electrode assembly 10, which is conducive to both electrodes 20 protruding from the head of the electrode assembly 10, so as to facilitate subsequent assembly and other processes.

[0075] See Figure 4 and Figure 5 , Figure 4 This is a partial structural schematic diagram of an electrode assembly in a battery according to another embodiment of this application. Figure 5 yes Figure 4 The diagram shows the exploded structure of the electrode assembly. Figure 4 and Figure 5As shown, the electrode assembly 10 includes a plurality of electrode sheets 15 stacked together. Each electrode sheet 15 is provided with a clearance opening 153 and a bevel 154. The clearance opening 153 is provided in one of the two beveled walls 13, and the bevel 154 is provided in the other of the two beveled walls 13. Each electrode sheet 15 has a first region 151 covered by an active layer and a second region 152 not covered by an active layer. The second region 152 is located closer to the bevel 154 than the first region 151. The clearance opening 153 is used to avoid the second region 152 of the adjacent electrode sheet 15.

[0076] The above design features a staggered arrangement of the clearance opening 153 and the inclined side 154 between two adjacent electrode pieces 15, which facilitates the differentiation of the two adjacent electrode pieces 15 so as to make electrical connections with different tabs 20.

[0077] For example, Figure 5 In the first electrode 15 and the third electrode 15 are electrode 15a, the second region 152 of electrode 15a is the second region 152a, the clearance 153 of electrode 15a is the clearance 153a, and the hypotenuse 154 of electrode 15a is the hypotenuse 154a; the second electrode 15 and the fourth electrode 15 are electrode 15b, the second region 152 of electrode 15b is the second region 152b, the clearance 153 of electrode 15b is the clearance 153b, and the hypotenuse 154 of electrode 15b is the hypotenuse 154b. The clearance openings 153a and 153b are staggered, and the inclined sides 154a and 154b are staggered, so that the clearance opening 153a of the electrode 15a can avoid the second region 152b at the inclined side 154b of the adjacent electrode 15b, and the clearance opening 153b of the electrode 15b can avoid the second region 152a at the inclined side 154a of the adjacent electrode 15a.

[0078] All the second regions 152 corresponding to the same inclined wall 13 can be connected as a single unit for electrical connection with a tab 20. For example, Figure 4 and Figure 5 In the middle, the second region 152a is connected as one unit and is used for electrical connection with one electrode 20, and the second region 152b is connected as one unit and is used for electrical connection with the other electrode 20.

[0079] The aforementioned electrode 15a can be a positive electrode, and the active layer covered by the first region 151 of the electrode 15a can be a positive active layer. The aforementioned second region 152a is connected as a whole and can be used to electrically connect with the positive electrode tab in the two tabs 20.

[0080] The electrode 15b can be a negative electrode, and the active layer covered by the first region 151 of the electrode 15b can be a negative active layer. The second region 152b is connected as a whole and can be used to electrically connect with the negative electrode tab in the two tabs 20.

[0081] The number of electrode 15a can be at least two, the number of electrode 15b can be at least two, and at least two electrode 15a and at least two electrode 15b are alternately stacked along the thickness direction z of the electrode assembly 10, and the separator separates the electrode 15a and electrode 15b.

[0082] In some embodiments, in the electrode 15, the boundary line 155 of its first region 151 and second region 152 is parallel to the inclined wall 13, so that the structure of the second region 152 is regular and facilitates electrical connection with the tab 20.

[0083] It should be noted that the term "parallel" used in the embodiments of this application describes an ideal state between two components. In actual production or use, two components may exist in a state of approximate parallelism. For example, in conjunction with numerical descriptions, parallelism can refer to the angle between two straight lines within the range of 180°±5°, parallelism can also refer to the dihedral angle between two planes within the range of 180°±5°, and parallelism can also refer to the angle between a straight line and a plane within the range of 180°±5°.

[0084] Two components described as "parallel" do not necessarily have to be perfectly straight lines or planes; they can be roughly straight or planes. As long as the overall direction of extension is straight or plane from a macroscopic perspective, the components can be considered "straight" or "plane." Due to manufacturing tolerances, a deviation of less than 0.5mm between two planes can be considered parallel.

[0085] For the aforementioned electrode 20, please refer to Figure 3 It includes a tab body 21, with both ends of the tab body 21 used for electrical connection with the electrode assembly 10 and the electronic device, respectively, so as to realize the electrical connection between the electrode assembly 10 and the electronic device.

[0086] In some embodiments, the tab body 21 extends along the extension direction of the first sidewall 11. That is, the tab body 21 extends along the length direction x of the electrode assembly 10, which is beneficial for subsequent assembly and other processes.

[0087] The aforementioned electrode body 21 is arranged along the extending direction of the first sidewall 11. The extending direction of the electrode body 21 can be parallel to the first sidewall 11, or it can be at an angle to the first sidewall 11, with the angle falling within a preset range. The preset range can be flexibly designed according to actual needs; for example, it can be ±10°, etc., and is not limited thereto.

[0088] For the aforementioned electrode 20, please refer to Figure 3It also includes tab adhesive 22, which connects to the tab body 21 and the third sealing part 34 to achieve a seal between the tab body 21 and the third sealing part 34 of the packaging bag 30. Specifically, the tab adhesive 22 and the third sealing part 34 can be heat-sealed using a heat-pressing device or tool. The tab adhesive 22 can be located around the outer periphery of the tab body 21 to achieve a complete seal around the tab body 21 at the third sealing part 34 of the packaging bag 30.

[0089] The aforementioned tab adhesive 22 is arranged along the extension direction of the inclined wall 13. The extension direction of the tab adhesive 22 can be parallel to the inclined wall 13, or it can be at an angle to the inclined wall 13, with the angle falling within a preset range. The preset range can be flexibly designed according to actual needs; for example, it can be ±10°, etc., and is not limited thereto.

[0090] See Figure 3 The tab adhesive 22 has a first surface 221 and a second surface 222 that are opposite each other along an extension direction perpendicular to the inclined wall 13, wherein the first surface 221 is disposed closer to the inclined wall 13 than the second surface 222.

[0091] The extension direction of the aforementioned tab adhesive 22 is parallel to the inclined wall 13, which can be: the first surface 221 is parallel to the inclined wall 13, and / or the second surface 222 is parallel to the inclined wall 13. Alternatively, the extension direction of the aforementioned tab adhesive 22 forms an angle with the inclined wall 13, and this angle is within a preset range, which can be: the first surface 221 forms an angle with the inclined wall 13, and this angle is within a preset range, and / or the second surface 222 forms an angle with the inclined wall 13, and this angle is within a preset range. The first surface 221 and the second surface 222 can be parallel to each other; this is not limited.

[0092] In some embodiments, the first surface 221 extends into the packaging body 31, such that the tab adhesive 22 is sealed to the third sealing portion 34 at least near the inner edge of the third sealing portion 34, thereby achieving a seal of the tab body 21 at least near the inner edge of the third sealing portion 34.

[0093] In some embodiments, the second surface 222 protrudes beyond the packaging bag 30, such that the tab adhesive 22 is sealed to the third sealing portion 34 at least near the outer edge of the third sealing portion 34, thereby achieving a seal of the tab body 21 at least near the outer edge of the third sealing portion 34.

[0094] In this embodiment, the first side 221 extends into the packaging body 31 and the second side 222 protrudes out of the packaging bag 30, so that the tab adhesive 22 is sealed and connected to the third sealing part 34 near both the inner and outer edges of the third sealing part 34, thereby improving the sealing effect of the tab body 21 at the third sealing part 34.

[0095] See Figure 3The tab adhesive 22 has a third surface 223 and a fourth surface 224 opposite to each other along the extension direction of the inclined wall 13, wherein the fourth surface 224 is disposed closer to the first side wall 11 than the third surface 223.

[0096] In some embodiments, the fourth surface 224 is parallel to the first sidewall 11, making the structure of the fourth surface 224 regular, which is beneficial for designing the anti-interference distance between the fourth surface 224 and the first sealing part 32.

[0097] In some embodiments, the third surface 223 is parallel to the first sidewall 11, making the structure of the third surface 223 regular.

[0098] In some embodiments, the third surface 223 and the fourth surface 224 are parallel to each other, but this is not limited.

[0099] In some embodiments, the third surface 223 is spaced apart from both the first sealing portion 32 and the second sealing portion 33, so that the third surface 223 of the tab adhesive 22 will not interfere with the first sealing portion 32 and the second sealing portion 33, which is beneficial to the sealing of the packaging bag 30.

[0100] In some embodiments, the fourth surface 224 is spaced apart from both the first sealing portion 32 and the second sealing portion 33, so that the fourth surface 224 of the tab adhesive 22 will not interfere with the first sealing portion 32 and the second sealing portion 33, which is beneficial to the sealing of the packaging bag 30.

[0101] In this embodiment, the third surface 223 is spaced apart from both the first sealing part 32 and the second sealing part 33, and the fourth surface 224 is also spaced apart from both the first sealing part 32 and the second sealing part 33, so that the tab adhesive 22 will not interfere with the first sealing part 32 and the second sealing part 33, which is beneficial to the sealing of the packaging bag 30.

[0102] In some embodiments, see Figure 3 Along the width direction y of the electrode assembly 10, the tab adhesive 22 is located on the side of the first sealing portion 32 near the electrode assembly 10 along the bending line. In this way, the tab adhesive 22 will not extend beyond the packaging bag 30 in the width direction y of the electrode assembly 10, and will not cause an increase in the size of the battery 1 in its width direction.

[0103] In some embodiments, see Figure 3 Along the length x of the electrode assembly 10, the tab adhesive 22 is located on the side of the second sealing portion 33 near the electrode assembly 10 along the bending line. In this way, the tab adhesive 22 does not extend beyond the packaging bag 30 in the length x of the electrode assembly 10, and does not cause an increase in the size of the battery 1 in its length direction.

[0104] See Figure 2The battery 1 includes two tabs 20, each of which protrudes from the electrode assembly 10 through two notches 14. The tab adhesive 22 of each tab 20 is inclined along the extension direction of the corresponding inclined wall 13. One of the two tabs 20 can be a positive tab, and the other can be a negative tab.

[0105] Regarding the aforementioned packaging bag 30, both its first sealing portion 32 and second sealing portion 33 are bent towards the packaging body 31. (See reference...) Figure 2 The first bend 321 of the first sealing portion 32 fits against the packaging body 31, reducing the space occupied by the battery 1 in its width direction. (See also...) Figure 1 and Figure 2 The second bend 331 of the second sealing part 33 fits into the packaging body 31, reducing the space occupied by the battery 1 in its length direction.

[0106] See Figure 2 The packaging bag 30 includes two first sealing portions 32 and two third sealing portions 34. The two first sealing portions 32 are respectively disposed on two first side walls 11, and the two third sealing portions 34 are respectively disposed on two inclined walls 13. Each third sealing portion 34 is connected between a first sealing portion 32 and a second sealing portion 33 and is disposed along the extension direction of the corresponding inclined wall 13. The tab adhesive 22 of the two tabs 20 is respectively connected to the two third sealing portions 34. In this way, each third sealing portion 34 can be disposed at an obtuse angle relative to the corresponding first sealing portion 32 and second sealing portion 33, so that the first sealing portion 32 and the second sealing portion 33 can be bent toward the direction of the packaging body 31. Compared with the related technology, only the first sealing portion bends toward the direction of the packaging body while the second sealing portion cannot be bent toward the direction of the packaging body, which can save the space occupied by the battery head packaging.

[0107] In some embodiments, see Figure 1 The packaging bag 30 can be made from a single packaging film. This packaging film is folded in half to form two connected parts. A recess is punched into one part of the packaging film, and then it is folded in half to seal the recess to form the main body of the packaging 31 and the first sealing part 32, the second sealing part 33 and the third sealing part 34 connecting the main body of the packaging 31.

[0108] In other embodiments, see Figure 6 , Figure 6 This is a cross-sectional structural diagram of a battery provided in another embodiment of this application, as shown below. Figure 6As shown, the packaging bag 30 can be made of two independent packaging films. The two packaging films form a packaging body 31 with a receiving cavity in the middle. The packaging body 31 is sealed and connected around it to form a first sealing part 32, a second sealing part 33, a third sealing part 34, and a fourth sealing part 35. The first sealing part 32, the second sealing part 33, the third sealing part 34, and the fourth sealing part 35 can all be bent toward the packaging body 31.

[0109] Based on the above analysis, the embodiment of this application, by designing the tab body 21 to protrude the electrode assembly 10 from the notch 14, and the tab adhesive 22 and the third sealing part 34 are both arranged along the extension direction of the inclined wall 13, can save the space occupied by the lead edge of the tab 20 at the head of the battery 1 and the packaging bag 30, and can also save the space occupied by the sealing part with the widest sealing space in the length and width directions of the battery 1 when sealing, and can also save the space occupied by the head of the battery 1 for sealing.

[0110] Due to the notch 14, the electrode assembly 20 will lose some space compared to a cuboid electrode assembly of the same length and width. For example, setting an avoidance opening 153 at the electrode 15 will result in a loss of space at the avoidance opening 153. Therefore, those skilled in the art can adjust the size of the avoidance opening 153 and the size of the notch 14 in the embodiments of this application to achieve overall space saving for the electrode assembly 20 compared to a cuboid electrode assembly of the same length and width, thereby improving the ED (energy density) of the battery 1.

[0111] Further, see Figure 7 , Figure 7 This is a partial cross-sectional structural diagram of a battery provided in another embodiment of this application, as shown below. Figure 7 As shown, battery 1 satisfies the following condition: W5*(L1+L2)>2*(H1+sinθ*(W1+W2+W3-W4)) 2 / tanθ. Where θ is the angle between the extension of the second sidewall 12 and the inclined wall 13, 0 < θ < 90°; H1 is the distance from the boundary line 155 of the first region 151 and the second region 152 to the second surface 222 of the tab adhesive 22 away from the electrode assembly 10, in mm; W1 is the width of the tab body 21 along the extension direction of the second sidewall 12, in mm; W2 is the width of the tab adhesive 22 located between the tab body 21 and the fourth surface 224 of the tab adhesive 22 near the first sealing part 32 along the extension direction of the second sidewall 12, in mm; W3 is the width of the tab body 21 along the extension direction of the second sidewall 12, in mm. The extension direction represents the anti-interference distance between the tab adhesive 22 and the first sealing part 32, in mm; W4 represents the distance between the electrode assembly 10 and the first sealing part 32 along the extension direction of the second sidewall 12, in mm; W5 represents the width of the electrode assembly 10 along the extension direction of the second sidewall 12, in mm; L1 represents the reduction in the distance between the electrode assembly 10 and the second sealing part 33 along the extension direction of the first sidewall 11, in mm; L2 represents the dimension of the second bend 331 of the second sealing part 33 along the extension direction of the first sidewall 11, in mm.

[0112] In the first conditional expression above, L1 represents the space occupied by the distance between the lead edge of the tab 20 and the packaging bag 30 saved at the head of the battery 1. L1 is the difference between the conventional head PA-gap (distance between the electrode assembly 10 and the second sealing portion 33) value and the head PA-gap value of this embodiment. In this embodiment, the head PA-gap value is approximately equal to the side PA-gap value (e.g., the distance W4 between the electrode assembly 10 and the first sealing portion 32). In the first conditional expression above, L2 represents the space saved by bending the second sealing portion 33 at the head of the battery 1. In the first conditional expression above, W5*(L1+L2) represents the area saved in this embodiment.

[0113] In the first condition above, 2* (H1+ sinθ*(W1+W2+ W3- W4)) 2 * / tanθ represents the area lost by the electrode assembly 10 in this embodiment. Specifically, the electrode assembly 10 in this embodiment will lose the area corresponding to the two clearance openings 153. These clearance openings 153 can be approximately triangular, and the area of ​​the two triangles can be the product of the length of the boundary line 155 of the first region 151 and the second region 152 and the height at the boundary line 155. The height at the boundary line 155 = H1 + H2, where H2 ≈ sinθ * (W1 + W2 + W3 - W4). The length of the boundary line 155 = 2 * (H1 + H2) / tanθ = 2 * (H1 + sinθ * (W1 + W2 + W3 - W4)) / tanθ, therefore, the area lost by the electrode assembly 10 is 2 * (H1 + H2). 2* / tanθ=2* (H1+ sinθ*(W1+W2+ W3-W4)) 2 / tanθ.

[0114] By calculating the above conditional equation, the range of the angle θ between the extension line of the second sidewall 12 and the inclined wall 13 can be roughly calculated. Adjusting the angle θ can change the area lost by the electrode assembly 10 in this embodiment, thereby saving space overall and improving the energy density of the battery 1.

[0115] In some embodiments, battery 1 satisfies the following condition: 16.7° < θ < 45°. Wherein, θ is the angle between the extension of the second sidewall 12 and the inclined wall 13. By reasonably limiting the angle θ between the extension of the second sidewall 12 and the inclined wall 13, the design difficulty of battery 1 can be simplified, thereby improving the energy density (ED) of battery 1.

[0116] This application also provides an electrical device, which includes the battery 1 described above. Electrical devices include, but are not limited to, electronic devices, vehicles, etc.

[0117] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" means at least two, for example, two, three, four, etc. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0118] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A battery, characterized in that, include: An electrode assembly has a first sidewall, a second sidewall adjacent to the first sidewall, and an inclined wall connecting the first sidewall and the second sidewall. The inclined wall is set at an obtuse angle relative to both the first sidewall and the second sidewall, so that a notch is formed on the side of the inclined wall away from the electrode assembly. The electrode includes an electrode body and an electrode adhesive connecting the electrode body. One end of the electrode body is electrically connected to the electrode assembly, and the other end of the electrode body protrudes from the electrode assembly through the notch. The electrode adhesive is disposed along the extension direction of the inclined wall, and the extension direction of the inclined wall is from the connection point between the inclined wall and the first side wall to the connection point between the inclined wall and the second side wall. The packaging bag includes a packaging body and a first sealing part, a second sealing part, and a third sealing part connected to the packaging body. The electrode assembly is located inside the packaging body. The first sealing part is disposed on the first side wall, the second sealing part is disposed on the second side wall, and the third sealing part is disposed on the inclined wall. The third sealing part is connected between the first sealing part and the second sealing part and is disposed along the extension direction of the inclined wall. The tab adhesive is connected to the third sealing part. The first sealing part is bent towards the packaging body to form a first bent part.

2. The battery according to claim 1, characterized in that, The second sealing portion is bent towards the packaging body to form a second bent portion, and the second bent portion fits into the packaging body; And / or, the first bend is fitted to the main body of the packaging.

3. The battery according to claim 1, characterized in that, Along the width direction of the electrode assembly, the tab adhesive is located on the side of the first sealing portion near the bend line of the electrode assembly; And / or, along the length of the electrode assembly, the tab adhesive is located on the side of the second sealing portion near the bend line of the electrode assembly.

4. The battery according to claim 1, characterized in that, The tab adhesive has a first surface and a second surface that are opposite each other along an extension direction perpendicular to the inclined wall. Wherein, the first surface is parallel to the inclined wall; and / or, the second surface is parallel to the inclined wall.

5. The battery according to claim 1, characterized in that, The tab adhesive has a first surface and a second surface that are opposite each other along an extension direction perpendicular to the inclined wall. Wherein, the first side extends into the packaging body; and / or, the second side protrudes outside the packaging bag.

6. The battery according to claim 1, characterized in that, The tab adhesive has a third and a fourth surface that are opposite each other along the extending direction of the inclined wall. Wherein, the third surface is parallel to the first sidewall; and / or, the fourth surface is parallel to the first sidewall.

7. The battery according to claim 1, characterized in that, The tab adhesive has a third and a fourth surface that are opposite each other along the extending direction of the inclined wall. Wherein, the third surface is spaced apart from both the first sealing portion and the second sealing portion; and / or, the fourth surface is spaced apart from both the first sealing portion and the second sealing portion.

8. The battery according to claim 1, characterized in that, The electrode body extends along the extension direction of the first sidewall.

9. The battery according to any one of claims 1 to 8, characterized in that, The electrode assembly has two first sidewalls and two inclined walls. The two first sidewalls are located on both sides of the electrode assembly in the width direction. Each first sidewall is connected to the second sidewall through an inclined wall. Each inclined wall has a notch formed on the side facing away from the electrode assembly. The battery includes two tabs, each tab protruding from the electrode assembly by two notches, and the tab adhesive of each tab is inclined along the extension direction of the corresponding inclined wall; The packaging bag includes two first sealing parts and two third sealing parts. The two first sealing parts are respectively disposed on two first side walls, and the two third sealing parts are respectively disposed on two inclined walls. Each third sealing part is connected between a first sealing part and a second sealing part and is disposed along the extension direction of the corresponding inclined wall. The tab adhesive of the two tabs is respectively connected to the two third sealing parts.

10. The battery according to claim 9, characterized in that, The electrode assembly includes: Multiple electrode sheets are stacked together. Each electrode sheet is provided with a clearance opening and a bevel. The clearance opening is provided on one of the two beveled walls, and the bevel is provided on the other of the two beveled walls. Each electrode sheet has a first region covered by an active layer and a second region not covered by an active layer. The second region is located closer to the bevel than the first region. The clearance opening is used to avoid the second region of the adjacent electrode sheet. All the second regions corresponding to the same inclined wall are connected as one unit and electrically connected to the electrode body of one of the electrodes.

11. The battery according to claim 10, characterized in that, The boundary lines of the first region and the second region are parallel to the inclined wall.

12. The battery according to claim 11, characterized in that, The battery satisfies the following condition: W5*(L1+ L2)>2* (H1+ sinθ*(W1+W2+ W3- W4)) 2 * / tanθ Wherein, θ is the angle between the extension line of the second sidewall and the inclined wall, 0 < θ < 90°; H1 is the distance from the boundary line between the first region and the second region to the second surface of the tab adhesive away from the electrode assembly, in mm; W1 is the width of the tab body along the extension direction of the second sidewall, in mm; W2 is the width of the tab adhesive between the tab body and the fourth surface of the tab adhesive near the first sealing part along the extension direction of the second sidewall, in mm; W3 is the anti-interference distance between the tab adhesive and the first sealing part along the extension direction of the second sidewall, in mm; W4 is the distance between the electrode assembly and the first sealing part along the extension direction of the second sidewall, in mm; W5 is the width of the electrode assembly along the extension direction of the second sidewall, in mm; L1 is the reduction in the distance between the electrode assembly and the second sealing part along the extension direction of the first sidewall, in mm; L2 is the dimension of the second bend of the second sealing part along the extension direction of the first sidewall, in mm.

13. The battery according to claim 1, characterized in that, The battery satisfies the following condition: 16.7° < θ < 45° Wherein, θ is the angle between the extension of the second sidewall and the inclined wall.

14. An electrical appliance, characterized in that, The battery includes any one of claims 1 to 13.

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