Electrochemical device and electrical equipment

Abstract

The present application provides an electrochemical device and an electrical device. The electrochemical device includes a packaging case, a separator, a first electrode assembly, and a second electrode assembly. The first packaging body of the packaging case includes a first main body portion and a first sealing edge portion, and its second packaging body includes a second main body portion and a second sealing edge portion. The first main body portion and the second main body portion are stacked along a first direction. The separator includes a third main body portion between the first main body portion and the second main body portion, and a third sealing edge portion between the first sealing edge portion and the second sealing edge portion; the third main body portion includes a first edge connected to the third sealing edge portion. Along the first direction, the distance t1 from the end of the first main body portion away from the third main body portion to the first edge is greater than the distance t2 from the end of the second main body portion away from the third main body portion to the first edge. The first sealing edge portion, the third sealing edge portion, and the second sealing edge portion are bent towards the first main body portion, and the risk of exceeding the packaging case is relatively low.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to an electrochemical device and an electrical device.

Background Art

[0002] With the improvement of market demand, it is becoming increasingly urgent to increase the working voltage of lithium-ion batteries. One existing method to increase the working voltage of lithium-ion batteries is to encapsulate and connect two bare battery cells in series in the same packaging case. However, when sealing and folding the edges of the packaging case, there is a problem that the folded edge exceeds the main body of the packaging case, resulting in a relatively high risk of encapsulation failure when subjected to external impacts.

Summary of the Invention

[0003] This application aims to provide an electrochemical device and an electrical device to solve or at least partially solve the problem in the prior art that when folding the edge of the packaging case, the folded edge exceeds the main body of the packaging case, resulting in a relatively high risk of encapsulation failure when subjected to external impacts.

[0004] According to one aspect of this application, an electrochemical device is provided. The electrochemical device includes a packaging case, a separator, a first electrode assembly, and a second electrode assembly. The packaging case includes a first packaging body and a second packaging body. The first packaging body includes a first main body portion and a first sealing edge portion. The second packaging body includes a second main body portion and a second sealing edge portion. The first main body portion and the second main body portion are stacked along a first direction. The separator includes a third main body portion and a third sealing edge portion. The third main body portion is disposed between the first main body portion and the second main body portion along the first direction to define a first cavity and a second cavity that are separated from each other between the first main body portion and the second main body portion. The third sealing edge portion is disposed between the first sealing edge portion and the second sealing edge portion. Among them, the first sealing edge portion, the third sealing edge portion, and the second sealing edge portion are bent towards the first main body portion. The third main body portion includes a first edge connected to the third sealing edge portion. The first electrode assembly is disposed in the first cavity. The second electrode assembly is disposed in the second cavity. Along the first direction, the distance from the end of the first main body portion away from the third main body portion to the first edge is t1, and the distance from the end of the second main body portion away from the third main body portion to the first edge is t2, where t1 is greater than t2. Compared with the situation in the prior art where the first packaging body and the second packaging body are symmetrically disposed with respect to the third main body portion, in the electrochemical device provided in this application, the risk that the folded edges of the first sealing edge portion, the third sealing edge portion, and the second sealing edge portion exceed the packaging case is relatively low.

[0005] In an optional manner, the third main body portion includes a first part and a second part, and the second part is recessed towards the first main body portion to form a recess. The recess can increase the depth of the second cavity, so that the second electrode assembly disposed in the second cavity can be partially received in the recess, and the thickness of the second electrode assembly along the first direction can be extended.

[0006] In an alternative manner, along the first direction, the first main body portion, the second main body portion, and the concave portion satisfy the following formula:

[0007] 0 < t3 ≤ (t1 - t2) / 2

[0008] Wherein, t3 is the depth of the concave portion along the first direction. By reasonably setting the distances between the first main body portion, the second main body portion, and the concave portion, different dimensional requirements of the first electrode assembly in the first cavity and the second electrode assembly in the second cavity along the first direction can be met. Furthermore, the first electrode assembly and the second electrode assembly with similar design systems, dimensions, and capacities can be used, and the overall consistency of the electrochemical device is better.

[0009] In an alternative manner, along the first direction, t1 is not less than 2.5 mm, which can reduce the risk that the folded edges of the first sealing portion, the third sealing portion, and the second sealing portion exceed the packaging shell after being bent.

[0010] In an alternative manner, the first electrode assembly and the second electrode assembly are connected in series.

[0011] In an alternative manner, the first sealing portion, the third sealing portion, and the second sealing portion together form a sealing portion, and the sealing portion includes a bent portion. Thus, in the direction where the first sealing portion extends from the first main body portion, the size of the electrochemical device becomes smaller; further, along the first direction, the height of the bent portion is h, and it satisfies: h ≤ t1, thereby ensuring that the folded edges of the first sealing portion, the third sealing portion, and the second sealing portion do not exceed the packaging shell after being bent, and reducing the risk of packaging failure.

[0012] In an alternative manner, the electrochemical device further includes an adhesive member, and the adhesive member is disposed between the first main body portion and the bent portion. Since the bent portion is bonded to the first main body portion through the adhesive member, the collision damage to the bent portion by external forces can be reduced, and the risk of warping deformation of the bent portion can be reduced, and the overall size of the electrochemical device is small.

[0013] In an alternative manner, the bent portion includes a first folded edge and a second folded edge, and the second folded edge is located between the first main body portion and the first folded edge, thereby further reducing the risk that the folded edges formed after bending the first sealing portion, the third sealing portion, and the second sealing portion exceed the packaging shell, and improving the reliability of packaging.

[0014] In an alternative manner, the adhesive member is disposed between the first main body portion and the second folded edge. Since the second folded edge is bonded to the first main body portion through the adhesive member, the collision damage to the second folded edge by external forces can be reduced, and the risk of warping deformation of the second folded edge can be reduced, and the overall size of the electrochemical device is small.

[0015] In an alternative embodiment, the partition includes an intermediate layer and a packaging layer located on the surface of the intermediate layer, and the packaging layer is at least located at the third edge-sealing portion.

[0016] In an alternative embodiment, the intermediate layer includes at least one of a metal material, a polymer material, or a carbon material, and the packaging layer includes a polymer material.

[0017] In an alternative embodiment, the metal material includes at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, stainless steel (SUS), and their compositions or alloys.

[0018] In an alternative embodiment, the above-mentioned polymer material includes at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride - hexafluoropropylene), poly(vinylidene fluoride - co - chlorotrifluoroethylene), silicone, vinylon, polypropylene, acid anhydride - modified polypropylene, polyethylene, ethylene and its copolymers, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone, amorphous alpha - olefin copolymer, and their derivatives.

[0019] In an alternative embodiment, the carbon material includes at least one of carbon felt, carbon film, carbon black, acetylene black, fullerene, conductive graphite film, or graphene film.

[0020] In an alternative embodiment, the first package further includes a first top - sealing portion, the second package further includes a second top - sealing portion, the partition further includes a third top - sealing portion, and the third top - sealing portion is disposed between the first top - sealing portion and the second top - sealing portion; the electrochemical device further includes a first tab, one end of the first tab is connected to the first electrode assembly, and the other end of the first tab extends out of the packaging case between the first top - sealing portion and the third top - sealing portion; the electrochemical device further includes a second tab, one end of the second tab is connected to the second electrode assembly, and the other end of the second tab extends out of the packaging case between the second top - sealing portion and the third top - sealing portion.

[0021] In an alternative embodiment, the first top - sealing portion, the second top - sealing portion, and the third top - sealing portion are disposed on the first side of the first main body portion, the first edge - sealing portion, the second edge - sealing portion, and the third edge - sealing portion are disposed on the third side of the first main body portion, and the first side is opposite to the third side; and / or, the first edge - sealing portion, the second edge - sealing portion, and the third edge - sealing portion are disposed on the second side of the first main body portion, and the first side is adjacent to the second side.

[0022] In an alternative embodiment, the first top sealing portion, the second top sealing portion, and the third top sealing portion are disposed on the first side of the first main body portion, the first edge sealing portion, the second edge sealing portion, and the third edge sealing portion are disposed on the second side of the first main body portion, and the first side is adjacent to the second side. The first package further includes a first bottom sealing portion, the second package further includes a second bottom sealing portion, and the partition further includes a third bottom sealing portion, and the third bottom sealing portion is disposed between the first bottom sealing portion and the second bottom sealing portion. The first bottom sealing portion, the second bottom sealing portion, and the third bottom sealing portion are disposed on the third side of the first main body portion, and the third side is opposite to the first side.

[0023] In an alternative embodiment, the first bottom sealing portion, the third bottom sealing portion, and the second bottom sealing portion are further bent towards the first main body portion.

[0024] In an alternative embodiment, the number of the first edge sealing portion, the second edge sealing portion, and the third edge sealing portion is more than two.

[0025] According to another aspect of the present application, there is provided an electrical device including the above-mentioned electrochemical device.

[0026] The beneficial effects of the present application include that, compared with the case where the first package and the second package are symmetrically disposed with respect to the third main body portion in the prior art, the electrochemical device provided by the present application reduces the risk that the folded edges of the first edge sealing portion, the third edge sealing portion, and the second edge sealing portion exceed the packaging shell after being bent.

Description of the Drawings

[0027] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a proportional limitation.

[0028] Figure 1 is a schematic diagram of the electrochemical device provided in the first embodiment of the present application;

[0029] Figure 2 is a schematic diagram of the packaging shell provided in the first embodiment of the present application;

[0030] Figure 3 is a schematic diagram of the packaging shell provided in the first embodiment of the present application before encapsulation and edge folding;

[0031] Figure 4 is an exploded schematic diagram of the electrochemical device provided in the first embodiment of the present application;

[0032] Figure 5 is a schematic diagram of another implementation manner of the electrochemical device provided in the first embodiment of the present application;

[0033] Figure 6 The first embodiment of the present application Figure 1Another schematic form of the electrochemical device in;

[0034] Figure 7 It is a schematic diagram showing the relative arrangement of the first top seal part and the first edge seal part in the electrochemical device provided in the first embodiment of the present application;

[0035] Figure 8 It is a schematic diagram showing the relative arrangement of the first top seal part and the first bottom seal part in the electrochemical device provided in the first embodiment of the present application;

[0036] Figure 9 It is a schematic diagram of the electrochemical device provided in the second embodiment of the present application;

[0037] Figure 10 It is a schematic diagram of an electrochemical device provided in the third embodiment of the present application;

[0038] Figure 11 It is a schematic diagram of another electrochemical device provided in the third embodiment of the present application;

[0039] Figure 12 It is a schematic diagram of the electrical equipment provided in the embodiments of the present application.

Specific Embodiments

[0040] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of the present application.

[0041] It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are only for the purpose of illustration.

[0042] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] Embodiment 1

[0044] Figure 1It is a schematic diagram of the electrochemical device 100 provided in the first embodiment of the present application. The electrochemical device 100 includes a packaging case 1, a separator 2, a first electrode assembly 3, and a second electrode assembly 4. The separator 2 is disposed inside the packaging case 1, and the first electrode assembly 3 and the second electrode assembly 4 are disposed inside the packaging case 1.

[0045] For the above-mentioned packaging case 1, please refer to Figure 2 , the packaging case 1 includes a first packaging body 11 and a second packaging body 12. The first packaging body 11 is used to accommodate the first electrode assembly 3, and the second packaging body 12 is used to accommodate the second electrode assembly 4.

[0046] The first packaging body 11 includes a first main body portion 111 and a first sealing edge portion 112, and the second packaging body 12 includes a second main body portion 121 and a second sealing edge portion 122. The first main body portion 111 and the second main body portion 121 are stacked along a first direction L1. The first sealing edge portion 112 is formed by the outer extension of the circumferential side of the first main body portion 111. The second sealing edge portion 122 is formed by the outer extension of the circumferential side of the second main body portion 121.

[0047] The above-mentioned first direction L1 can be expressed as the thickness direction of the electrochemical device 100. The thickness direction of the electrochemical device 100 is perpendicular to the main plane of the first main body portion 111, or the thickness direction of the electrochemical device 100 is perpendicular to the main plane of the second main body portion 121. Wherein, the main plane of the first main body portion 111 is the plane with the largest area in the first main body portion 111. Wherein, the main plane of the second main body portion 121 is the plane with the largest area in the second main body portion 121.

[0048] In the embodiments of the present application, for the convenience of description, it is defined that the first direction L1 is from the first main body portion 111 to the second main body portion 121, that is, the first direction L1 is from the center of the first main body portion 111 to the center of the second main body portion 121. When the main plane of the first main body portion 111 is parallel to the main plane of the second main body portion 121, the first direction L1 is from the main plane of the first main body portion 111 to the main plane of the second main body portion 121.

[0049] It should be noted that the "first direction L1" is only set for the convenience of description.

[0050] In some embodiments, please refer to Figure 3 , the first packaging body 11 and the second packaging body 12 are integrally formed, and the first packaging body 11 and the second packaging body 12 can be folded along their connection position ( Figure 3 the dotted line in), so that the first main body portion 111 and the second main body portion 121 coincide along the above-mentioned first direction L1, and so that the first sealing edge portion 112 and the second sealing edge portion 122 coincide.

[0051] In some embodiments, the first package body 11 and the second package body 12 are formed separately. When the first package body 11 and the second package body 12 are assembled to form the package shell 1, the first main body portion 111 and the second main body portion 121 are stacked along the first direction L1, and the first edge-sealing portion 112 and the second edge-sealing portion 122 are overlapped.

[0052] For the above-mentioned partition 2, please refer to Figure 4 , the partition 2 includes a third main body portion 21 and a third edge-sealing portion 22. The third main body portion 21 is disposed between the first main body portion 111 and the second main body portion 121 along the first direction L1, and the third edge-sealing portion 22 is disposed between the first edge-sealing portion 112 and the second edge-sealing portion 122, so as to define a first cavity 11s between the third main body portion 21 and the first main body portion 111, and a second cavity 12s between the third main body portion 21 and the second main body portion 121. Wherein, the first cavity 11s is used to accommodate the first electrode assembly 3, and the second cavity 12s is used to accommodate the second electrode assembly 4.

[0053] In some embodiments, please refer to Figure 5 , the partition 2 includes an intermediate layer 21s and a packaging layer 22s located on the surface of the intermediate layer 21s. The packaging layer 22s is at least located at the third edge-sealing portion 22. That is, optionally, the packaging layer 22s only covers the third edge-sealing portion 22, or, optionally, the packaging layer 22s covers the intermediate layer 21s of the third edge-sealing portion 22 and partially covers the intermediate layer 21s of the third main body portion 21, or, optionally, the packaging layer 22s covers the intermediate layer 21s of the third edge-sealing portion 22 and the intermediate layer 21s of the third main body portion 21, that is, covers the entire intermediate layer of the partition.

[0054] In some embodiments, the intermediate layer 21s includes at least one of a metal material, a polymer material or a carbon material, and the packaging layer 22s includes a polymer material.

[0055] Wherein, the above-mentioned metal materials include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, stainless steel (SUS) and their compositions or alloys, etc.

[0056] Among them, the above-mentioned polymer materials include at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride - hexafluoropropylene), poly(vinylidene fluoride - co - chlorotrifluoroethylene), silicone, vinylon, polypropylene, anhydride - modified polypropylene, polyethylene, ethylene and its copolymers, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone, amorphous α - olefin copolymer and its derivatives.

[0057] Among them, the above-mentioned carbon materials include at least one of carbon felt, carbon film, carbon black, acetylene black, fullerene, conductive graphite film or graphene film.

[0058] For the above-mentioned packaging shell 1 and partition 2, please refer to Figure 4 and Figure 6 , it can be understood that the first cavity 11s is formed by the first main body part 111 being recessed in a direction away from the third main body part 21. The second cavity 12s is formed by the second main body part 121 being recessed in a direction away from the third main body part 21. The third main body part 21 includes a first edge 221 connected to the third sealing edge part 22.

[0059] Along the first direction L1, the distance from the end of the first main body part 111 away from the third main body part 21 to the first edge 221 is t1, and the distance from the end of the second main body part 121 away from the third main body part 21 to the first edge 221 is t2, where t1 is greater than t2.

[0060] Among them, the end of the first main body part 111 away from the third main body part 21 is the surface of the first main body part 111 facing away from the third main body part 21.

[0061] Among them, the distance from the end of the first main body part 111 away from the third main body part 21 to the first edge 221 is the distance from the end of the first main body part 111 away from the third main body part 21 to the central cross - section c1 of the first edge 221.

[0062] Among them, the end of the second main body part 121 away from the third main body part 21 is the surface of the second main body part 121 facing away from the third main body part 21.

[0063] Among them, the distance from the end of the second main body part 121 away from the third main body part 21 to the first edge 221 is the distance from the end of the second main body part 121 away from the third main body part 21 to the central cross - section c1 of the first edge 221.

[0064] Among them, the meaning that t1 is greater than t2 is that, along the first direction L1, the maximum distance from a point on the surface of the first main body portion 111 facing away from the third main body portion 21 to the first edge 221 is greater than the maximum distance from a point on the surface of the second main body portion 121 facing away from the third main body portion 21 to the first edge 221.

[0065] Please refer to Figure 6 , the above-mentioned first sealing edge portion 112, the third sealing edge portion 22, and the second sealing edge portion 122 are bent toward the first main body portion 111 to form a first folded edge 10. In the first embodiment of the present application, the first folded edge 10 is the bent portion 120. In Figure 6 , the first folded edge 10 is the area within the dashed box. Additionally, Figure 6 the dashed box in is only used for convenient description in the text part of the present application and is not a component of the electrochemical device 100.

[0066] Since the distance from the end of the first main body portion 111 away from the third main body portion 21 to the first edge 221 is greater than the distance from the end of the second main body portion 121 away from the third main body portion 21 to the first edge 221, compared with the situation in the prior art where the first packaging body 11 and the second packaging body 12 are symmetrically arranged with respect to the third main body portion 21, the risk that the first folded edge 10 formed by bending the first sealing edge portion 112, the third sealing edge portion 22, and the second sealing edge portion 122 exceeds the packaging shell 1 is relatively low.

[0067] It should be noted that, in some embodiments, along the first direction L1, the distance t1 from the end of the first main body portion 111 away from the third main body portion 21 to the first edge 221 is not less than 2.5 millimeters, so that the risk that the first folded edge 10 formed by bending the first sealing edge portion 112, the third sealing edge portion 22, and the second sealing edge portion 122 toward the first main body portion 111 exceeds the packaging shell 1 is reduced. In some embodiments, along the first direction L1, the height of the bent portion 120, that is, the height of the first folded edge 10 is h, and it satisfies: h ≤ t1.

[0068] Among them, the height of the bent portion 120, or the height h of the first folded edge 10 is taken as the distance from the end of the first folded edge 10 facing away from the second main body portion 121 to the central section c1 of the first edge 221 along the first direction L1.

[0069] In some embodiments, please refer to Figure 6 , a bonding member 5 is further provided between the first folded edge 10 and the first main body portion 111. The first folded edge 10 is bonded to the first main body portion 111 through the bonding member 5, so that the collision damage to the first folded edge 10 by external forces can be reduced, and the risk of warping deformation of the first folded edge 10 can be reduced, and the overall size of the electrochemical device 100 is small.

[0070] It should be noted that, in some embodiments, please refer to Figure 6, the wall thickness of the first main body portion 111 is the same as that of the second main body portion 121. Since the distance t1 from the end of the first main body portion 111 far from the third main body portion 21 to the first edge 221 is greater than the distance t2 from the end of the second main body portion 121 far from the third main body portion 21 to the first edge 221, it brings the possibility for the differential setting of the first electrode assembly 3 and the second electrode assembly 4.

[0071] For the above-mentioned packaging case 1 and partition 2, please refer to Figure 7 , the first package 11 further includes a first top sealing portion 113, the second package 12 further includes a second top sealing portion 123, the partition 2 further includes a third top sealing portion 23, and the first top sealing portion 113, the third top sealing portion 23 and the second top sealing portion 123 are stacked along the first direction L1. The electrochemical device 100 further includes a first tab 6. One end of the first tab 6 is connected to the first electrode assembly 3. Along the second direction L2, the other end of the first tab 6 extends out of the packaging case 1 between the first top sealing portion 113 and the third top sealing portion 23 to be connected to an external electrical device. The electrochemical device 100 further includes a second tab 7. One end of the second tab 7 is connected to the second electrode assembly 4. Along the second direction L2, the other end of the second tab 7 extends out of the packaging case 1 between the second top sealing portion 123 and the third top sealing portion 23.

[0072] Wherein, the second direction L2 is perpendicular to the first direction L1.

[0073] Wherein, in some embodiments, the second direction L2 may also be referred to as the length direction of the electrochemical device 100.

[0074] In some embodiments, please refer to Figure 7 , the first top sealing portion 113 and the first sealing edge portion 112 are oppositely arranged on both sides of the first main body portion 111 along the second direction L2, the second top sealing portion 123 and the second sealing edge portion 122 are oppositely arranged on both sides of the second main body portion 121 along the second direction L2, and the third top sealing portion 23 and the third sealing edge portion 22 are oppositely arranged on both sides of the third main body portion 21 along the second direction L2.

[0075] In other embodiments, please refer to Figure 6 , the first sealing edge portion 112 is arranged on both sides of the first main body portion 111 along the third direction L3, the second sealing edge portion 122 is arranged on both sides of the second main body portion 121 along the third direction L3, and the third sealing edge portion 22 is arranged on both sides of the third main body portion 21 along the third direction L3.

[0076] Wherein, the third direction L3 is perpendicular to the first direction L1 and the second direction L2 respectively.

[0077] Wherein, in some embodiments, the third direction L3 may also be referred to as the width direction of the electrochemical device 100.

[0078] It is understandable that the number of the above-mentioned first tabs 6 is at least two, one of the first tabs 6 being the positive tab and the other first tab 6 being the negative tab.

[0079] It is understandable that the number of the above-mentioned second tabs 7 is at least two, one of the second tabs 7 being the positive tab and the other second tab 7 being the negative tab.

[0080] It should be noted that please refer to Figure 6 and Figure 8 When the first sealing edge portion 112 is disposed on both sides of the first main body portion 111 along the third direction L3, the second sealing edge portion 122 is disposed on both sides of the second main body portion 121 along the third direction L3, the third sealing edge portion 22 is disposed on both sides of the third main body portion 21 along the third direction L3, the first packaging body 11 further includes a first bottom sealing portion 114, the first bottom sealing portion 114 and the first top sealing portion 113 are oppositely disposed on both sides of the first main body portion 111 along the second direction L2, the second packaging body 12 further includes a second bottom sealing portion 124, the second bottom sealing portion 124 and the second top sealing portion 123 are oppositely disposed on both sides of the second main body portion 121 along the second direction L2, and the partition 2 further includes a third bottom sealing portion 24, the third bottom sealing portion 24 and the third top sealing portion 23 are oppositely disposed on both sides of the third main body portion 21 along the second direction L2.

[0081] In some embodiments, the first bottom sealing portion 114, the third bottom sealing portion 24 and the second bottom sealing portion 124 are also bent towards the first main body portion 111.

[0082] It should be noted that please refer to Figure 6 When the first sealing edge portion 112 is disposed on both sides of the first main body portion 111 along the third direction L3, the second sealing edge portion 122 is disposed on both sides of the second main body portion 121 along the third direction L3, the third sealing edge portion 22 is disposed on both sides of the third main body portion 21 along the third direction L3, the number of the first sealing edge portions 112 is two, and the two first sealing edge portions 112 are oppositely disposed on both sides of the first main body portion 111 along the third direction L3, the number of the second sealing edge portions 122 is two, and the two second sealing edge portions 122 are oppositely disposed on both sides of the second main body portion 121 along the third direction L3, and the number of the third sealing edge portions 22 is two, and the two third sealing edge portions 22 are oppositely disposed on both sides of the third main body portion 21 along the third direction L3.

[0083] For the above-mentioned first electrode assembly 3, please refer to Figure 4 The first electrode assembly 3 is disposed in the first cavity 11s, and the first electrode assembly 3 is used to supply power to an external electrical device. The external power supply can also charge the first electrode assembly 3.

[0084] For the above-mentioned second electrode assembly 4, please refer to Figure 4, the second electrode assembly 4 is disposed in the second cavity 12s, and the second electrode assembly 4 is used to supply power to an external electrical device. The external power supply can also charge the second electrode assembly 4.

[0085] In some embodiments, the first electrode assembly 3 and the second electrode assembly 4 are connected in series and are used to supply power to an external electrical device.

[0086] For the above-mentioned first electrode assembly 3 and second electrode assembly 4, please refer to Figure 6 , from the above, since along the first direction L1, the depth h1 of the first cavity 11s is greater than the depth h2 of the second cavity 12s, then along the first direction L1, the thickness of the first electrode assembly 3 disposed in the first cavity 11s is greater than the thickness of the second electrode assembly 4 disposed in the second cavity 12s. In some embodiments, the capacities of the first electrode assembly 3 and the second electrode assembly 4 are the same.

[0087] In the present application, along the first direction L1, the distance from the end of the first main body portion 111 away from the third main body portion 21 to the first edge 221 is t1, and the distance from the end of the second main body portion 121 away from the third main body portion 21 to the first edge 221 is t2, where t1 is greater than t2. Therefore, the risk that the folded edges of the first sealing portion 112, the third sealing portion 22, and the second sealing portion 122 exceed the packaging case 1 is reduced.

[0088] Embodiment Two

[0089] Figure 9 is a schematic diagram of the electrochemical device 100 provided in Embodiment Two of the present application. The difference between Embodiment Two and Embodiment One is that the first sealing portion 112, the third sealing portion 22, and the second sealing portion 122 are bent towards the first main body portion 111 to form a first folded edge 10, and the first folded edge 10 is bent towards the first main body portion 111 to form a second folded edge 20, and the second folded edge 20 is located between the first main body portion 111 and the first folded edge 10. That is, the first sealing portion 112, the third sealing portion 22, and the second sealing portion 122 are bent once to form the first folded edge 10, and the first folded edge 10 is bent once again to form the second folded edge 20. In Embodiment Two of the present application, the bending portion 120 includes the first folded edge 10 and the second folded edge 20. Figure 9 The areas in the two dashed boxes in Figure 9 respectively show the first folded edge 10 and the second folded edge 20 schematically. The two dashed boxes in

[0090] In some embodiments, a bonding member 5 is further provided between the second folded edge 20 and the first main body portion 111. The second folded edge 20 is bonded to the first main body portion 111 through the bonding member 5, thereby reducing the collision damage of the second folded edge 20 by external forces, reducing the risk of warping and deformation of the second folded edge 20, and the overall size of the electrochemical device 100 is small.

[0091] It should be noted that other technologies in Embodiment 1 can also be combined with Embodiment 2, and the technical solutions formed thereby are also within the protection scope of this application.

[0092] In the embodiments of the present application, after the first sealing edge portion 112, the third sealing edge portion 22, and the second sealing edge portion 122 are bent toward the first main body portion 111 to form the first folded edge 10, they are further bent toward the first main body portion 111 to form the second folded edge 20, thereby further reducing the risk that the folded edges formed after the bending of the first sealing edge portion 112, the third sealing edge portion 22, and the second sealing edge portion 122 exceed the packaging shell 1.

[0093] Embodiment 3

[0094] Figure 10 FIG. is a schematic diagram of an electrochemical device 100 provided in Embodiment 3 of the present application. The difference between Embodiment 3 and Embodiment 1 is that the third main body portion 21 of the separator 2 includes a first portion 211 and a second portion 212, and the second portion 212 is recessed toward the first main body portion 111 to form a recess 2s. The distance from one end of the first main body portion 111 away from the first portion 211 to the first edge 221 is t1, and the distance from one end of the second main body portion 121 away from the first portion 211 to the first edge 221 is t2. Among them, t1 is greater than t2.

[0095] Among them, one end of the first main body portion 111 away from the first portion 211 is the surface of the first main body portion 111 facing away from the first portion 211.

[0096] Among them, one end of the second main body portion 121 away from the first portion 211 is the surface of the second main body portion 121 facing away from the first portion 211.

[0097] Among them, the meaning of t1 being greater than t2 is that along the first direction L1, the maximum distance from a point on the surface of the first main body portion 111 facing away from the first portion 211 to the first edge 221 is greater than the maximum distance from a point on the surface of the second main body portion 121 facing away from the first portion 211 to the first edge 221.

[0098] It should be noted that in some embodiments, along the first direction L1, the following formula is satisfied:

[0099] 0 < t3 ≤ (t1 - t2) / 2

[0100] Among them, t3 is the depth of the concave portion 2s along the first direction L1, that is, the distance from the end of the second part 212 close to the second main body part 121 to the central section c1 of the first edge 221 along the first direction L1.

[0101] Among them, the end of the second part 212 close to the second main body part 121 is the surface of the second part 212 facing the second main body part 121.

[0102] In some other embodiments, the first cavity 11s, the second cavity 12s, and the concave portion 2s satisfy the following formula:

[0103]

[0104] Among them, 0.4 mm is the tolerance.

[0105] The above concave portion 2s is a part of the second cavity 12s. The second electrode assembly 4 arranged in the second cavity 12s can be partially received in the concave portion 2s. When t1 - t3 = t2 + t3, that is, when the depth (t1 - t3) of the first cavity 11s is equal to the depth (t2 + t3) of the second cavity 12s, the thicknesses of the first electrode assembly 3 and the second electrode assembly 4 along the first direction L1 can be set to be similar, so that the first electrode assembly 3 and the second electrode assembly 4 can have similar design systems, design sizes, and capacities. Thus, the overall consistency of the electrochemical device 100 is relatively good.

[0106] It should be noted that, in some embodiments, the first part 211 is arranged on the peripheral side of the second part 212.

[0107] It should be noted that Embodiment 3 can also be combined with the above Embodiment 2, and the technical solution formed thereby is also within the protection scope of this application.

[0108] The electrochemical device 100 formed by combining Embodiment 3 and Embodiment 2 can be referred to Figure 11 , Figure 11 Different from the electrochemical device 100 provided in Embodiment 1, the third main body part 21 of the separator 2 includes the above first part 211 and second part 212, and the first folding edge 10 formed by bending the first sealing edge part 112, the third sealing edge part 22, and the second sealing edge part 122 toward the first main body part 111 bends toward the first main body part 111 to form a second folding edge 20.

[0109] In the embodiment of the present application, the third main body portion 21 of the partition 2 includes a first portion 211 and a second portion 212. The second portion 212 is recessed toward the first main body portion 111 to form a recess 2s. The recess 2s serves as a part of the second cavity 12s. Thus, the second electrode assembly 4 disposed in the second cavity 12s can be partially received in the recess 2s, thereby expanding the thickness of the second electrode assembly 4 along the first direction L1. Furthermore, by reasonably setting the depths of the first cavity 11s, the second cavity 12s, and the recess 2s, the first electrode assembly 3 in the first cavity 11s and the second electrode assembly 4 in the second cavity 12s can be set to have the same thickness along the first direction L1. Furthermore, the first electrode assembly 3 and the second electrode assembly 4 with similar design systems, set sizes, and capacities can be used, and the overall consistency of the electrochemical device 100 is relatively good.

[0110] Embodiment Four

[0111] Embodiment Four provides an example of an electrical device 200. Please refer to Figure 12 , the electrical device 200 includes a load 201 and the electrochemical device 100 of any one of Embodiment One, Embodiment Two, and Embodiment Three. The electrochemical device 100 is connected to the load 201, and the electrochemical device 100 is used to supply power to the load 201.

[0112] The electrical device 200 can be an energy storage product, a mobile phone, a tablet, a drone, an electric vehicle with one wheel or two or more wheels, or an electric cleaning tool, etc.

[0113] For example, for the above-mentioned drone, the battery pack is carried on the drone, and the battery pack is used to supply power to the loads on the drone, including the flight system, the control system, and the camera system, etc.

[0114] It should be noted that the description and drawings of the present application give preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not additional limitations to the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Furthermore, the above technical features continue to be combined with each other to form various embodiments not listed above, all of which are regarded as within the scope described in the specification of the present application; further, for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present application.

Claims

1. An electrochemical device, characterized in that, comprising: A packaging shell, including a first packaging body and a second packaging body. The first packaging body includes a first main body portion and a first sealing edge portion, and the second packaging body includes a second main body portion and a second sealing edge portion. The first main body portion and the second main body portion are stacked along a first direction; A separator, including a third main body portion and a third sealing edge portion. The third main body portion is disposed between the first main body portion and the second main body portion along the first direction to define a first cavity and a second cavity that are separated from each other between the first main body portion and the second main body portion; the third sealing edge portion is disposed between the first sealing edge portion and the second sealing edge portion. Among them, the first sealing edge portion, the third sealing edge portion, and the second sealing edge portion are bent toward the first main body portion; the third main body portion includes a first edge connected to the third sealing edge portion; A first electrode assembly, disposed in the first cavity; A second electrode assembly, disposed in the second cavity; Along the first direction, the distance from the end of the first main body portion away from the third main body portion to the first edge is t1, and the distance from the end of the second main body portion away from the third main body portion to the first edge is t2, where t1 is greater than t2; The third main body portion includes a first portion and a second portion, and the second portion is recessed toward the first main body portion to form a recess; Along the first direction, the first main body portion, the second main body portion, and the recess satisfy the following formula: 0 < t3 ≤ (t1 - t2) / 2 wherein, the t3 is the depth of the recess along the first direction.

2. The electrochemical device according to claim 1, characterized in that, satisfying at least one of the following conditions: (1), along the first direction, the t1 is not less than 2.5 millimeters; (2), the first electrode assembly and the second electrode assembly are connected in series.

3. The electrochemical device according to claim 1, characterized in that, The first sealing edge portion, the third sealing edge portion, and the second sealing edge portion together form a sealing edge portion, and the sealing edge portion includes a bent portion; along the first direction, the height of the bent portion is h, satisfying: h ≤ t1.

4. The electrochemical device according to claim 3, characterized in that, satisfying at least one of the following conditions: (i) The bent portion includes a first folded edge and a second folded edge, and the second folded edge is located between the first main body portion and the first folded edge; (ii) The electrochemical device further includes an adhesive member, and the adhesive member is disposed between the first main body portion and the bent portion.

5. The electrochemical device according to claim 1, characterized in that, The separator includes an intermediate layer and a packaging layer on the surface of the intermediate layer, satisfying at least one of the following conditions: (a) The packaging layer is at least located at the third sealing edge portion; (b) The intermediate layer includes at least one of a metal material, a polymer material, or a carbon material, and the packaging layer includes a polymer material.

6. The electrochemical device according to claim 1, characterized in that, The first package further includes a first top seal portion, the second package further includes a second top seal portion, and the separator further includes a third top seal portion disposed between the first top seal portion and the second top seal portion; the electrochemical device further includes a first tab, one end of the first tab is connected to the first electrode assembly, and the other end of the first tab extends out of the package housing between the first top seal portion and the third top seal portion; the electrochemical device further includes a second tab, one end of the second tab is connected to the second electrode assembly, and the other end of the second tab extends out of the package housing between the second top seal portion and the third top seal portion.

7. The electrochemical device according to claim 6, wherein, the first top seal portion, the second top seal portion, and the third top seal portion are disposed on a first side of the first main body portion, satisfying at least one of the following conditions: (c) the first sealing edge portion, the second sealing edge portion, and the third sealing edge portion are disposed on a third side of the first main body portion, and the first side is opposite to the third side; (d) the first sealing edge portion, the second sealing edge portion, and the third sealing edge portion are disposed on a second side of the first main body portion, and the first side is adjacent to the second side.

8. An electrical device, wherein, it includes the electrochemical device according to any one of claims 1-7.

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