Adhesives and electrochemical devices

Abstract

The present application discloses an adhesive and an electrochemical device, wherein the adhesive comprises a first side, a second side, a third side, a first boundary line, and a second boundary line. The first side is opposite to the second side, the third side comprises a first end and a second end opposite to the first end, and the first end is connected to the second side. The two ends of the second boundary line are respectively connected to the first boundary line and the first side, and the two ends of the first boundary line are respectively connected to the second boundary line and the second end. Among them, the angle formed by the connecting line between the two ends of the first boundary line and the connecting line between the two ends of the second boundary line is R1, 5°≤R1≤235°. The above-mentioned adhesive forms an angle R1 through the first boundary line and the second boundary line. When it is bonded to the battery cell, the fold corresponding to the side of the battery cell is located within the range of the first boundary line and the second boundary line, which can reduce the risk of the adhesive being pressed down on the surface of the battery cell to form a sharp corner, reduce the impact on the outer dimensions of the battery cell, and thus reduce the production cost.

Description

Technical Field

[0001] The present application relates to the technical field of battery cells, and in particular to an adhesive component and an electrochemical device. Background Art

[0002] At present, soft-pack batteries are generally bonded with insulating tape to provide insulation protection. On the side of the battery, the tape is mostly designed with straight edges and vertical openings. The tape is easily pressed down during transportation and actual production, resulting in sharp corners. The existence of sharp corners will affect the measurement of the battery's outer dimensions, resulting in increased labor costs and equipment operation problems, which in turn increases production costs. Summary of the invention

[0003] In view of the above situation, it is necessary to provide an adhesive to reduce the risk of the adhesive being pressed down on the surface of the battery cell to form sharp corners, reduce the impact on the outer dimensions of the battery cell, and thus reduce production costs.

[0004] An embodiment of the present application provides an adhesive member, including a first side, a second side, a third side, a first boundary line, and a second boundary line. The first side is opposite to the second side, the third side includes a first end and a second end opposite to the first end, and the first end is connected to the second side. The two ends of the second boundary line are respectively connected to the first boundary line and the first side, and the two ends of the first boundary line are respectively connected to the second boundary line and the second end. Among them, the angle formed by the line between the two ends of the first boundary line and the line between the two ends of the second boundary line is R1, 5°≤R1≤235°.

[0005] The above-mentioned adhesive forms an angle R1 through the first boundary line and the second boundary line. When bonded to the battery cell, the fold corresponding to the side of the battery cell is located within the range of the first boundary line and the second boundary line, which can reduce the risk of the adhesive being pressed down on the surface of the battery cell to form sharp corners and reduce the impact on the outer dimensions of the battery cell.

[0006] In some embodiments of the present application, 30°≤R1<180°.

[0007] In some embodiments of the present application, 60°≤R1≤150°.

[0008] In some embodiments of the present application, 90°≤R1≤150°.

[0009] In some embodiments of the present application, the second side includes a third boundary line, a fourth boundary line, and a fifth boundary line connected in sequence, the two ends of the third boundary line are respectively connected to the fourth boundary line and the first end, and the angle formed by the line between the two ends of the third boundary line and the line between the two ends of the third side is R2, 0°<R2<180°.

[0010] In some embodiments of the present application, 30°≤R2≤150°.

[0011] In some embodiments of the present application, an angle formed by a line connecting two ends of the third boundary line and a line connecting two ends of the fourth boundary line is R3, and 30°≤R3≤180°.

[0012] In some embodiments of the present application, 60°≤R3≤180°.

[0013] In some embodiments of the present application, an angle formed by a line connecting two ends of the fourth boundary line and a line connecting two ends of the fifth boundary line is R4, and 0°<R4≤180°.

[0014] In some embodiments of the present application, 30°≤R4≤180°.

[0015] In some embodiments of the present application, an angle between a line connecting two ends of the first boundary line and the first direction is R5, 5°≤R5≤60°, wherein the first direction is a length direction of the adhesive.

[0016] In some embodiments of the present application, an angle between a line connecting two ends of the second boundary line and the first direction is R6, 15°≤R6≤180°, wherein the first direction is a length direction of the adhesive.

[0017] An embodiment of the present application also provides an electrochemical device, comprising a shell, an electrode assembly, a pole ear, and an adhesive of any of the above embodiments. The shell comprises a main body, a first sealing part and a second sealing part, the first sealing part and the second sealing part are respectively connected to the main body, the main body has a first surface, a second surface and a third surface connected to each other, the first sealing part extends from the first surface, the second sealing part extends from the second surface and is bent toward the third surface. The electrode assembly is accommodated in the main body. One end of the pole ear is connected to the electrode assembly, and the other end extends from the first sealing part to the shell. The first edge is attached to the side of the second sealing part away from the second surface, the second edge is attached to the third surface, and the third edge is attached to the first surface and / or the first sealing part.

[0018] The above-mentioned adhesive forms an angle R1 through the first boundary line and the second boundary line. When bonded to the shell, the fold corresponding to the side of the shell is located within the range of the first boundary line and the second boundary line, which can reduce the risk of the adhesive being pressed down on the shell surface to form sharp corners, reduce the impact on the outer dimensions of the electrochemical device, and thus reduce production costs.

[0019] In some embodiments of the present application, the second surface and the third surface intersect at the first connecting line; the adhesive member has a fold, which is opposite to the first connecting line; the fold intersects with the first boundary line, or intersects with the intersection of the first boundary line and the second boundary line.

[0020] To summarize, the adhesive of the embodiment of the present application forms an angle R1 through the first boundary line and the second boundary line. When bonded to the battery cell, the crease corresponding to the side of the battery cell is located within the range of the first boundary line and the second boundary line. This can reduce the risk of the adhesive being pressed down on the surface of the battery cell to form sharp corners, reduce the impact on the outer dimensions of the battery cell, and thereby reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure when the adhesive component is not bent in one embodiment of the present application.

[0022] Figure 2 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0023] Figure 3 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0024] Figure 4 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0025] Figure 5 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0026] Figure 6 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0027] Figure 7 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0028] Figure 8 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0029] Fig. 9 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0030] Fig.10 It is a schematic diagram of the structure when the adhesive member is not bent in another embodiment of the present application.

[0031] Fig.11 It is a partial structural schematic diagram of an electrochemical device in one embodiment of the present application.

[0032] Fig.12 It is a schematic diagram of the structure before the shell is packaged in one embodiment of the present application.

[0033] Fig.13 It is a schematic diagram of a certain state structure of an electrochemical device in one embodiment of the present application.

[0034] Fig.14It is a schematic diagram of another state structure of an electrochemical device in one embodiment of the present application.

[0035] Main component symbols

[0036] Electrochemical device 100

[0037] Adhesive 10

[0038] First side 11

[0039] Second side 12

[0040] The third boundary line 121

[0041] Fourth Boundary Line 122

[0042] Fifth Boundary Line 123

[0043] Third side 13

[0044] First end 131

[0045] Second end 132

[0046] First boundary line 14

[0047] Second boundary line 15

[0048] Crease 16

[0049] Fourth side 17

[0050] Housing 20

[0051] Main body 21

[0052] First surface 211

[0053] Second surface 212

[0054] The third surface 213

[0055] First connection line 214

[0056] First sealing portion 22

[0057] Second sealing portion 23

[0058] First floor 24

[0059] Third floor 25

[0060] The first folding portion 26

[0061] The second folded portion 27

[0062] Accommodation slot 28

[0063] Edge banding 29

[0064] Electrode assembly 30

[0065] Positive ear 41

[0066] Negative ear 42

[0067] First direction X

[0068] Second direction Y

[0069] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0071] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally disposed element at the same time. When an element is considered to be "disposed on" another element, it may be directly disposed on the other element or there may be a centrally disposed element at the same time.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0073] In this application, the term "parallel" is used to describe the ideal state between two components (edges or lines or surfaces). In actual production or use, there may be a state that is approximately parallel between the two components. For example, in combination with numerical descriptions, parallel can refer to the angle range between two straight lines being between 180°±10°, parallel can also refer to the dihedral angle range between two planes being between 180°±10°, and parallel can also refer to the angle range between a straight line and a plane being between 180°±10°. The two components described as "parallel" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic point of view, the components can be considered to be "straight lines" or "planes" if the overall extension direction is a straight line or a plane.

[0074] The term "perpendicular" is used to describe the ideal state between two components (edges or lines or surfaces). In actual production or use, there may be a state that is approximately perpendicular between the two components. For example, combined with numerical descriptions, perpendicularity can refer to the angle between two straight lines being between 90±10°, perpendicularity can also refer to the dihedral angle between two planes being between 90°±10°, and perpendicularity can also refer to the angle between a straight line and a plane being between 90±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0075] An embodiment of the present application provides an adhesive member, including a first side, a second side, a third side, a first boundary line, and a second boundary line. The first side is opposite to the second side, the third side includes a first end and a second end opposite to the first end, and the first end is connected to the second side. The two ends of the second boundary line are respectively connected to the first boundary line and the first side, and the two ends of the first boundary line are respectively connected to the second boundary line and the second end. Among them, the angle formed by the line between the two ends of the first boundary line and the line between the two ends of the second boundary line is R1, 5°≤R1≤235°.

[0076] The above-mentioned adhesive forms an angle R1 through the first boundary line and the second boundary line. When bonded to the battery cell, the fold corresponding to the side of the battery cell is located within the range of the first boundary line and the second boundary line. This can reduce the risk of the adhesive being pressed down on the surface of the battery cell to form sharp corners, reduce the impact on the outer dimensions of the battery cell, and thus reduce production costs.

[0077] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0078] Embodiment 1:

[0079] like Figure 1 As shown, the first embodiment of the present application provides an adhesive 10 that can be used to bond soft-pack battery cells to play a role in insulation protection.

[0080] The adhesive member 10 includes a first side 11, a second side 12, a third side 13, a first boundary line 14, and a second boundary line 15. The first side 11 is opposite to the second side 12, the third side 13 is connected to the second side 12, and the third side 13 is separated from the first side 11. The two ends of the first boundary line 14 are respectively connected to the third side 13 and the second boundary line 15, and the two ends of the second boundary line 15 are respectively connected to the first boundary line 14 and the first side 11. The third side 13 includes a first end 131 and a second end 132 opposite to the first end 131. The first end 131 is connected to the second side 12, and the second end 132 is connected to the first boundary line 14. The angle formed by the connecting line between the two ends of the first boundary line 14 and the connecting line between the two ends of the second boundary line 15 is R1, 5°≤R1≤235°. The adhesive 10 forms an angle R1 through the first boundary line 14 and the second boundary line 15. When bonded to the battery cell, the fold corresponding to the adhesive 10 and the side of the battery cell is located within the range of the first boundary line 14 and the second boundary line 15, which can reduce the risk of the adhesive 10 being pressed down to form a sharp corner, reduce the impact on the outer dimensions of the battery cell, and thus reduce production costs. In the present application, the angle R1 is: the angle outside the adhesive 10 where the line between the two ends of the first boundary line 14 and the line between the two ends of the second boundary line 15 intersect.

[0081] Specifically, the value of the angle R1 can be any one of 5°, 15°, 30°, 45°, 60°, 75°, 90°, 95°, 135°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175°, 185°, 190°, 195°, 200°, 205°, 210°, 215°, 220°, 225°, 230° and 235°.

[0082] The adhesive member 10 is made of insulating material. In one embodiment, the adhesive member 10 includes insulating adhesive tape.

[0083] In some embodiments, 30°≤R1<180°. When the adhesive 10 is bonded to the battery cell, the fold corresponding to the adhesive 10 and the side of the battery cell is located within the range of the first boundary line 14 and the second boundary line 15. The adhesive 10 can attach the exposed metal layer of the battery cell shell to insulate and protect it. At this time, the risk of short circuit in the battery cell can be further reduced, and the risk of sharp corners when the side of the battery cell is pressed down can be further reduced, thereby further reducing the impact on the outer dimensions of the battery cell, and further reducing production costs. In some other embodiments, 135°≤R1≤150°. In some other embodiments, 5°≤R1≤75°.

[0084] In one embodiment, the first side 11 and the second side 12 are parallel to each other and are parallel to the first direction X, wherein the first direction X is the length direction of the adhesive 10. In the present application, the length direction of the adhesive 10 is the extension direction of the adhesive 10.

[0085] In one embodiment, the angle between the two ends of the first boundary line 14 and the first direction X is R5, 5°≤R5≤60°. In one embodiment, 15°≤R5≤45°. Optionally, the value of the angle R5 can be any one of 15°, 20°, 25°, 30°, 35°, 40° and 45°. In the present application, the angle R5 is the minimum angle among the angles formed by the two ends of the first boundary line 14 and the first direction X.

[0086] In one embodiment, the angle between the two ends of the second boundary line 15 and the first direction X is R6, 15°≤R6≤180°. In the present application, the angle R6 is the angle between the two ends of the second boundary line 15 and the first direction X, which are located in the adhesive member 10. Optionally, the value of the angle R6 can be any one of 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 70°, 80°, 90°, 100°, 120°, 135°, 150°, 165° and 180°.

[0087] In one embodiment, 15°≤R6<90°, such as Figure 1 In other embodiments, 90°≤R6≤180°.

[0088] like Figure 2 As shown, in other embodiments, R6 =90°, and the second boundary line 15 is perpendicular to the first direction X and the first side 11 .

[0089] like Figure 3 In other embodiments, 90°<R6<180°.

[0090] like Figure 4 As shown, in other embodiments, R6=180°, the second boundary line 15 is parallel to the first direction X and the first side 11, and the adhesive member 10 further includes a fourth side 17, and two ends of the fourth side 17 are respectively connected to the second boundary line 15 and the first side 11.

[0091] As an example, 15°≤R6<90° is taken as an example for further explanation.

[0092] Please continue reading Figure 1 In one embodiment, along the first direction X, the length of the first boundary line 14 is d1, d1 ≥ 1 mm. In one embodiment, 1.5 mm ≤ d1 ≤ 3 mm. In the present application, the length d1 refers to: the vertical distance between the two ends of the first boundary line 14 along the first direction X. Optionally, the value of d1 can be any one of 1.5 mm, 2 mm, 2.5 mm and 3 mm.

[0093] In one embodiment, along the second direction Y perpendicular to the first direction X, the length of the second boundary line 15 is d2, d2 ≥ 1 mm. In one embodiment, 1 mm ≤ d2 ≤ 5.5 mm. In the present application, the length d2 refers to: the vertical distance between the two ends of the second boundary line 15 along the second direction Y. Optionally, the value of d2 can be any one of 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm and 5.5 mm.

[0094] In one embodiment, the second direction Y is the width direction of the adhesive 10. In one embodiment, the line between the first end 131 and the second end 132 of the third side 13 is parallel to the second direction Y, and the line between the first end 131 and the second end 132 is perpendicular to the first side 11 and the second side 12.

[0095] In one embodiment, the first boundary line 14 and the second boundary line 15 intersect to form a structure that is concave in the adhesive member 10, such as Figure 1 As shown, at this time, R1<180°.

[0096] like Figure 5 As shown, in one embodiment, the first boundary line 14 and the second boundary line 15 intersect to form a structure protruding from the adhesive member 10, at this time, R1>180°. In one embodiment, along the first direction X, the intersection of the first boundary line 14 and the second boundary line 15 is located between the intersection of the first boundary line 14 and the third side 13 and the intersection of the second boundary line 15 and the first side 11. In other embodiments, along the first direction X, the intersection of the first boundary line 14 and the second boundary line 15 extends beyond the third side 13 (not shown).

[0097] like Figure 6 As shown, in one embodiment, the second side 12 includes a third boundary line 121, a fourth boundary line 122, and a fifth boundary line 123 connected in sequence, the two ends of the third boundary line 121 are respectively connected to the fourth boundary line 122 and the first end 131, and the two ends of the fourth boundary line 122 are respectively connected to the third boundary line 121 and the fifth boundary line 123. In one embodiment, the fifth boundary line 123 is parallel to the first side 11.

[0098] The line between the two ends of the third boundary line 121 and the line between the two ends of the third side 13 form an angle R2, 0°<R2<180°. In one embodiment, 30°≤R2≤150°. In one embodiment, 45°≤R2≤120°. In one embodiment, 60°≤R2≤120°.

[0099] Optionally, the value of the angle R2 can be any one of 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115° and 120°.

[0100] In one embodiment, the angle formed by the line between the two ends of the third boundary line 121 and the line between the two ends of the fourth boundary line 122 is R3, 30°≤R3≤180°. In the present application, the angle R3 is: the angle at which the line between the two ends of the third boundary line 121 and the line between the two ends of the fourth boundary line 122 intersect, and are located outside the adhesive 10.

[0101] In one embodiment, 60°≤R3≤180°. In one embodiment, 90°≤R3≤180°. In one embodiment, 120°≤R3≤180°. Optionally, the value of the angle R3 can be any one of 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175° and 180°.

[0102] In one embodiment, the angle formed by the line between the two ends of the fourth boundary line 122 and the line between the two ends of the fifth boundary line 123 is R4, 0°<R4≤180°. In the present application, the angle R4 is: the angle where the line between the two ends of the fourth boundary line 122 and the line between the two ends of the fifth boundary line 123 intersect, and are located within the adhesive 10.

[0103] In one embodiment, 30°≤R4≤180°. In one embodiment, 60°≤R4≤150°. In one embodiment, 90°≤R4≤150°. Optionally, the value of the angle R4 can be any one of 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145° and 150°.

[0104] In one embodiment, the angle between the line between the two ends of the third boundary line 121 and the first direction X is R7, 0°≤R7≤90°. In one embodiment, 15°≤R7≤60°. In the present application, the angle R7 is the minimum angle among the angles formed by the two ends of the third boundary line 121 and the first direction X. Optionally, the value of the angle R7 can be any one of 15°, 17°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° and 60°.

[0105] In one embodiment, the angle between the line between the two ends of the fourth boundary line 122 and the first direction X is R8, 0°≤R8≤90°. In one embodiment, 13°≤R8≤60°. In the present application, the angle R8 is the minimum angle among the angles formed by the two ends of the fourth boundary line 122 and the first direction X. Optionally, the value of the angle R8 can be any one of 13°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° and 60°.

[0106] In one embodiment, along the first direction X, the length of the third boundary line 121 is d3, d3 ≥ 1.5 mm. In one embodiment, 1.5 mm ≤ d3 ≤ 3 mm. In the present application, the length d3 refers to: the vertical distance between the two ends of the third boundary line 121 along the first direction X. Optionally, the value of d3 can be any one of 1.5 mm, 2 mm, 2.5 mm and 3 mm.

[0107] In one embodiment, d3 = d1 + 0.5 mm.

[0108] In one embodiment, along the second direction Y, the length of the fourth boundary line 122 is d4, d4 ≥ 1 mm. In the present application, the length d4 refers to: the vertical distance between the two ends of the fourth boundary line 122 along the second direction Y. Optionally, the value of d3 can be any one of 1.5 mm, 2 mm, 2.5 mm and 3 mm.

[0109] like Figure 7 As shown, in one embodiment, R1 = 128°, R5 = 20°, R6 = 72°, R2 = 73°, R3 = 150°, R7 = 17°, R8 = 13°, and R4 = 167°. The first boundary line 14 and the second boundary line 15 intersect to form a structure that is concave in the adhesive member 10. The third boundary line 121 and the fourth boundary line 122 intersect to form a structure that is concave in the adhesive member 10.

[0110] like Figure 8 As shown, in one embodiment, R1 = 165°, R5 = 30°, R6 = 45°, R2 = 73°, R3 = 150°, R7 = 17°, R8 = 13°, and R4 = 167°. The first boundary line 14 and the second boundary line 15 intersect to form a structure concave in the adhesive member 10. The third boundary line 121 and the fourth boundary line 122 intersect to form a structure concave in the adhesive member 10.

[0111] like Fig. 9 As shown, in one embodiment, R1=128°, R5=20°, R6=72°, R2=73°, R3=73°, R7=17°, R8=90°, and R4=90°. The first boundary line 14 and the second boundary line 15 intersect to form a structure concave in the adhesive member 10. The third boundary line 121 and the fourth boundary line 122 intersect to form a structure concave in the adhesive member 10, and the fourth boundary line 122 is perpendicular to the fifth boundary line 123.

[0112] like Fig.10As shown, in one embodiment, R1 = 128°, R5 = 20°, R6 = 72°, R2 = 73°, R3 = 163°, R7 = 17°, R8 = 00°, and R4 = 180°. The first boundary line 14 and the second boundary line 15 intersect to form a structure that is concave in the adhesive member 10. The third boundary line 121 and the fourth boundary line 122 intersect to form a structure that is concave in the adhesive member 10. In one embodiment, the fourth boundary line 122 and the fifth boundary line 123 are both parallel to the first side 11.

[0113] Embodiment 2:

[0114] like Fig.11 , Fig.12 and Fig.13 As shown, the second embodiment of the present application provides an electrochemical device 100, which can be used to store electrical energy and supply power to electrical equipment. The electrochemical device 100 includes a housing 20, an electrode assembly 30, a tab, and an adhesive member 10 described in any one of the first embodiments. The electrode assembly 30 is accommodated in the housing 20, one end of the tab is connected to the electrode assembly 30, and the other end of the tab extends out of the housing 20, and the adhesive member 10 is bonded to the surface of the housing 20.

[0115] The shell 20 includes a main body 21 , a first sealing part 22 and a second sealing part 23 . The electrode assembly 30 is accommodated in the main body 21 . The first sealing part 22 and the second sealing part 23 extend from the surface of the main body 21 . The electrode tab extends from the first sealing part 22 to the shell 20 .

[0116] The electrode assembly 30 includes a positive electrode sheet, a negative electrode sheet and a separator. The separator is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet are stacked or wound.

[0117] The tabs include a positive tab 41 and a negative tab 42 . One end of the positive tab 41 is connected to the positive electrode sheet, and the other end of the positive tab 41 extends out of the housing 20 . One end of the negative tab 42 is connected to the negative electrode sheet, and the other end of the negative tab 42 extends out of the housing 20 .

[0118] The main body 21 has a first surface 211, a second surface 212 and a third surface 213 connected to each other. The first sealing portion 22 extends from the first surface 211, and the second sealing portion 23 extends from the second surface 212 and bends toward the third surface 213. In one embodiment, the second sealing portion 23 is attached to the second surface 212.

[0119] The first side 11 of the adhesive 10 is attached to the side of the second sealing portion 23 away from the second surface 212 , the second side 12 is attached to the third surface 213 , and the third side 13 is bent from the third surface 213 toward the first sealing portion 22 and attached to the first surface 211 and / or the first sealing portion 22 .

[0120] In one embodiment, before the electrochemical device 100 is packaged, the housing 20 includes a first folding portion 26 and a second folding portion 27, and at least one of the first folding portion 26 and the second folding portion 27 is provided with a receiving groove 28 for receiving the electrode assembly 30. The electrode assembly 30 is received in the receiving groove 28, and the first folding portion 26 and the second folding portion 27 are folded and connected to form a main body 21 and an edge sealing portion 29, which extends outward from the surface of the main body 21, and includes a first sealing portion 22 and a second sealing portion 23.

[0121] In one embodiment, the shell 20 is a composite layered structure, including a first layer 24, a second layer (not shown) and a third layer 25, wherein the second layer is located between the first layer 24 and the third layer 25, the first layer 24 constitutes the inner surface of the shell 20, and the third layer 25 constitutes the outer surface of the shell 20. In one embodiment, the first layer 24 and the second layer are connected by an adhesive, and the second layer and the third layer 25 are connected by an adhesive.

[0122] In one embodiment, the material of the first layer 24 includes but is not limited to polypropylene. In one embodiment, the first layer 24 has the property of being resistant to corrosion by electrolyte.

[0123] In one embodiment, the second layer is made of metal, including but not limited to aluminum and steel.

[0124] In one embodiment, the material of the third layer 25 includes but is not limited to nylon. In one embodiment, the third layer 25 plays a role in protecting the second layer, reducing the risk of the second layer being scratched or pierced.

[0125] In one embodiment, the second sealing portion 23 exposes the second layer at the end surface away from the main body 21, which increases the risk of short circuit of the electrochemical device 100. The first side 11 of the adhesive 10 is attached to the second sealing portion 23, and the second side 12 is attached to the third surface 213, which can cover the exposed second layer at the end of the second sealing portion 23, thereby reducing the risk of short circuit of the electrochemical device 100.

[0126] In one embodiment, the housing 20 , the electrode assembly 30 and the tabs constitute a soft-pack battery cell.

[0127] Please combine Figure 1 , Fig.11 , Fig.13 and Fig.14 In one embodiment, the second surface 212 and the third surface 213 intersect at a first connection line 214 , and the adhesive member 10 has a fold 16 , which is opposite to the first connection line 214 .

[0128] In one embodiment, the fold 16 intersects with the intersection of the first boundary line 14 and the second boundary line 15. In one embodiment, the fold 16 intersects with the first boundary line 14. In one embodiment, the fold 16 intersects with the second boundary line 15. The fold 16 intersects with the first boundary line 14 and / or the second boundary line 15, so that when the first edge 11 is attached to the side of the second sealing portion 23 away from the second surface 212, the adhesive 10 can cover the exposed second layer of the second sealing portion 23, thereby reducing the risk of short circuit of the electrochemical device 100.

[0129] In one embodiment, the fold 16 is parallel to the first side 11 .

[0130] In one embodiment, at least a portion of the adhesive 10 extends out of the first surface 211 , the portion of the adhesive 10 extending out of the first surface 211 is bent toward the first sealing portion 22 , and the third edge 13 is attached to the first surface 211 and / or the first sealing portion 22 .

[0131] In one embodiment, when the first boundary line 14 and the second boundary line 15 intersect to form a structure recessed in the adhesive member 10 , preferably, the fold 16 intersects at the intersection of the first boundary line 14 and the second boundary line 15 .

[0132] In one embodiment, the first boundary line 14 and the second boundary line 15 intersect to form a structure protruding from the adhesive member 10, and the fold 16 intersects with the second boundary line 15. Figure 2 shown.

[0133] In one embodiment, the thickness of the electrochemical device 100 is D1, d2≤110%*D1, so that the portion between the fold 16 and the first edge 11 on the adhesive 10 can be stably bonded to the second surface 212 and the second sealing portion 23, reducing the risk of the adhesive 10 falling off.

[0134] In one embodiment, the length of the first sealing portion 22 extending from the first surface 211 is D2, d1≤D2, d3≤D2, so that the portion of the adhesive 10 extending from the first surface 211 can be stably bonded to the first surface 211 and / or the first sealing portion 22, reducing the risk of the adhesive 10 falling off.

[0135] In one embodiment, the width of the electrochemical device 100 is D3, d4≤D3, so that the portion between the fold 16 and the second edge 12 of the adhesive 10 can be stably bonded to the third surface 213, reducing the risk of the adhesive 10 falling off.

[0136] In one embodiment, the main body 21 further has a fourth surface (not shown), the fourth surface is opposite to the second surface 212, and the fourth surface connects the first surface 211 and the third surface 213. The housing 20 further includes a third sealing portion (not shown), the third sealing portion extends from the fourth surface and bends toward the third surface 213. The electrochemical device 100 includes two adhesive members 10, wherein the first edge 11 of one adhesive member 10 is attached to the second sealing portion 23, the first edge 11 of the other adhesive member 10 is attached to the fourth sealing portion, and the second edge 12 of the other adhesive member 10 is attached to the third surface 213. The two adhesive members 10 are bonded to the housing 20 in the same manner, which will not be repeated.

[0137] In one embodiment, the second sealing portion 23 extends out of the first surface 211, and after the second sealing portion 23 is bent toward the third surface 213, the portion extending out of the first surface 211 is bent toward the first surface 211. In one embodiment, a portion of the third side 13 is attached to the first surface 211, a portion of the third side 13 is attached to the second sealing portion 23 located on the first surface 211, and a portion of the third side 13 is attached to the first sealing portion 22. In one embodiment, a portion of the third side 13 is attached to the second sealing portion 23 located on the first surface 211, and a portion of the third side 13 is attached to the first sealing portion 22.

[0138] In addition, those skilled in the art may also make other changes within the spirit of the present application. Of course, these changes made according to the spirit of the present application should be included in the scope disclosed in the present application.

Claims

1. An electrochemical device, characterized in that: include: The housing comprises a main body, a first sealing part and a second sealing part, wherein the first sealing part and the second sealing part are respectively connected to the main body, the main body has a first surface, a second surface and a third surface connected to each other, the first sealing part extends out of the first surface, and the second sealing part extends out of the second surface and is bent toward the third surface; An electrode assembly, housed in the main body; A tab, one end of which is connected to the electrode assembly, and the other end of which extends from the first sealing portion to the shell; An adhesive member, comprising a first side, a second side and a third side, wherein the first side is opposite to the second side, the third side comprises a first end and a second end opposite to the first end, the first end is connected to the second side, and the adhesive member further comprises: First boundary line; a second boundary line, wherein two ends of the second boundary line are respectively connected to the first boundary line and the first side, and two ends of the first boundary line are respectively connected to the second boundary line and the second end; The angle formed by the line connecting the two ends of the first boundary line and the line connecting the two ends of the second boundary line is R1, 5°≤R1≤235°; The first edge is attached to a side of the second sealing portion facing away from the second surface, the second edge is attached to the third surface, and the third edge is attached to the first surface and / or the first sealing portion.

2. The electrochemical device according to claim 1, characterized in that 135°≤R1＜180°。 3. The electrochemical device according to claim 1, characterized in that The second side includes a third boundary line, a fourth boundary line and a fifth boundary line connected in sequence, the two ends of the third boundary line are respectively connected to the fourth boundary line and the first end, and the angle formed by the line between the two ends of the third boundary line and the line between the two ends of the third side is R2, 0°<R2<180°.

4. The electrochemical device according to claim 3, characterized in that 30°≤R2≤150°。 5. The electrochemical device according to claim 3, characterized in that An angle formed by a line connecting two ends of the third boundary line and a line connecting two ends of the fourth boundary line is R3, and 30°≤R3≤180°.

6. The electrochemical device according to claim 5, characterized in that 60°≤R3≤180°。 7. The electrochemical device according to claim 3, characterized in that An angle formed by a line connecting two ends of the fourth boundary line and a line connecting two ends of the fifth boundary line is R4, and 0°<R4≤180°.

8. The electrochemical device according to claim 7, characterized in that 30°≤R4≤180°。 9. The electrochemical device according to claim 1, wherein: An angle between a line connecting two ends of the first boundary line and a first direction is R5, 5°≤R5≤60°, wherein the first direction is a length direction of the adhesive.

10. The electrochemical device according to claim 1, wherein An angle between a line connecting two ends of the second boundary line and the first direction is R6, 15°≤R6≤180°, wherein the first direction is a length direction of the adhesive.

11. The electrochemical device according to claim 1, wherein The second surface and the third surface intersect at a first connecting line; The adhesive member has a fold, and the fold is opposite to the first connecting line; The fold intersects with the first boundary line, or intersects with an intersection point of the first boundary line and the second boundary line.

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