阅读说明：本技术 电化学装置和电子装置 (Electrochemical device and electronic device ) 是由 侯军辉 于 2020-03-26 设计创作，主要内容包括：一种电化学装置,包括第一极片和第一极耳,第一极片包括集流体和设置于集流体上的活性物质层。集流体包括第一面,第一面设有第一空白区,集流体包括相对设置的第一边和第二边,第一极耳电连接第一空白区并相较于第一边凸出。第一极耳上设有第一极耳胶,第一极耳胶包括第一胶层,第一胶层包括朝向第二边的第三边。其中,第三边与第二边之间的最小距离为D-(1)(mm),第一边与第二边的距离为W(mm),则D-(1)<W。本申请还提供一种包括前述电化学装置的电子装置。本申请可防止第一极耳在电化学装置跌落时断裂,提高安全可靠性和使用寿命。(An electrochemical device comprises a first pole piece and a first pole lug, wherein the first pole piece comprises a current collector and an active substance layer arranged on the current collector. The mass flow body includes first face, and first face is equipped with first blank area, and the mass flow body is including relative first limit and the second limit that sets up, and first blank area is connected to first utmost point ear electricity and is comparatively in first side protrusion. Be equipped with first utmost point ear on the first utmost point ear and glue, first utmost point ear is glued including first glue film, and first glue film includes towards the third on second limit. Wherein the minimum distance between the third edge and the second edge is D 1 (mm), the distance between the first edge and the second edge is W (mm), then D 1 <W is added. The present application also provides an electronic device including the aforementioned electrochemical device. This application can prevent that first utmost point ear from breaking when electrochemical device falls, improves fail safe nature and life.)

1. An electrochemical device comprises a first pole piece and a first pole ear, wherein the first pole piece comprises a current collector and an active substance layer arranged on the current collector,

the current collector comprises a first surface, the first surface is provided with a first blank area, the current collector comprises a first edge and a second edge which are oppositely arranged, the first blank area is electrically connected with the first lug and protrudes compared with the first edge,

the first tab is provided with a first tab adhesive, the first tab adhesive comprises a first adhesive layer, the first adhesive layer comprises a third edge facing the second edge,

wherein a minimum distance between the third edge and the second edge is D₁(mm), the distance between the first edge and the second edge is W (mm), then D₁<W。

2. The electrochemical device according to claim 1, wherein the first glue layer covers a portion of the first blank area.

3. The electrochemical device of claim 1, wherein the first void region comprises a fourth edge, the fourth edge being distal from the second edge, the fourth edge being spaced apart from the second edge by a distance D₂(mm) then D₂<D₁。

4. The electrochemical device of claim 1, wherein D₁<W-0.2。

5. The electrochemical device according to claim 1, wherein the second side to the first side is a first direction along which the first glue layer includes a first portion and a second portion connecting the first portion, the third side is located at the first portion, and a length of the first portion is smaller than a length of the second portion.

6. The electrochemical device according to claim 5, wherein a junction of the first portion and the second portion or an edge of the first portion is provided with a concavo-convex structure.

7. The electrochemical device according to claim 1, wherein the current collector further includes a second face opposite to the first face, the second face including a second blank region, a projection of the first tab on the second face being located within the second blank region,

the first tab glue comprises a second glue layer connected with the first glue layer, the first tab is positioned between the first glue layer and the second glue layer, the second glue layer comprises a fifth edge facing the second edge,

the minimum distance between the fifth edge and the second edge is D₃(mm) then D₃<W。

8. The electrochemical device according to claim 1, wherein the first blank area is located in a middle portion of the current collector.

9. The electrochemical device according to claim 1, wherein the electrochemical device further comprises a second tab, the first face further having a third empty space, the second tab being electrically connected to the third empty space and protruding compared to the first edge,

a second ear glue is arranged on the second ear, the second ear glue comprises a third glue layer, the third glue layer comprises a sixth edge facing the second edge,

wherein a minimum distance between the sixth side and the second side is D₄(mm) then D₄<W。

10. An electronic device comprising the electrochemical device according to any one of claims 1 to 9.

Technical Field

The present disclosure relates to the field of energy storage technologies, and more particularly, to an electrochemical device and an electronic device having the same.

Background

Electrochemical devices (such as batteries) are widely used in electronic products such as electronic mobile devices, electric tools, electric vehicles and the like, and people have higher and higher requirements on the safety performance of the electrochemical devices. Since electronic products are often subjected to mechanical abuse such as dropping, collision, vibration and the like in the using process, the dropping performance of the electrochemical device is required to be higher and higher.

The electrochemical device usually adopts aluminum foil as a cathode tab and adopts copper foil or nickel foil as an anode tab, and the tabs can be used as connecting parts of the electrochemical device and external charging and discharging equipment. When an electronic product falls, the bending strength of the tabs is not enough to bear the impact on the electrochemical device, and the tabs are broken, so that the electric energy accumulated in the electrochemical device cannot be transmitted to the outside, the external electric energy cannot be transmitted to the electrochemical device, the electrochemical device is caused to lose efficacy, the safety and reliability are reduced, and the service life is shortened.

Disclosure of Invention

In view of the shortcomings of the prior art, it is necessary to provide an electrochemical device which is beneficial to improving the problem of tab fracture.

In addition, it is also necessary to provide an electronic device having the electrochemical device.

The application provides an electrochemical device, including first pole piece and first utmost point ear, first pole piece includes the mass flow body and sets up the active material layer on the mass flow body. The mass flow body includes first face, and first face is equipped with first blank area, and the mass flow body is including relative first limit and the second limit that sets up, and first blank area is connected to first utmost point ear electricity and is comparatively in first side protrusion. Be equipped with first utmost point ear on the first utmost point ear and glue, first utmost point ear is glued including first glue film, and first glue film includes towards the third on second limit. Wherein the minimum distance between three sides of the first end part and the second side is D₁(mm), the distance between the first edge and the second edge is W (mm), then D₁<W。

The third edge of the first glue film of this application is less than the first edge of first pole piece, consequently, the third edge of first glue film can be by the centre gripping in electrode subassembly's inside, when electrochemical device takes place the machinery and abuse, because first glue film is by the centre gripping, can prevent first utmost point ear because crooked and fracture, and then avoid electrochemical device failure problem, improves electrochemical device's fail safe nature and life.

In some embodiments of the present application, the first adhesive layer covers a portion of the first blank area. So set up when can avoiding having the clearance between the third edge of first glue film and the first blank region, the problem of stress concentration is produced easily in the trilateral juncture of first utmost point ear and first glue film, further prevents first utmost point ear because stress concentration breaks.

In some embodiments of the present application, the first blank area includes a fourth edge, the fourth edge is far from the second edge, and a distance between the fourth edge and the second edge is D₂(mm) then D₂<D₁. Because the third edge of the first glue layer can be clamped by other areas without notches on the first edge, the first pole lug can be prevented from being broken due to deflection.

In some embodiments of the present application, D₁<W-0.2. Therefore, the first adhesive layer can extend into the electrode assembly for a sufficient length, so that the first adhesive layer can be prevented from separating from the first blank area when the electrochemical device is subjected to mechanical abuse, and the safety, reliability and service life are further improved.

In some embodiments of the present application, the second side to the first side is a first direction, and along the first direction, the first adhesive layer includes a first portion and a second portion connected to the first portion, the third side is located at the first portion, and a length of the first portion is smaller than a length of the second portion. Because the sizes of the first part and the second part are different, the material of the first part of the first glue layer can be saved, and the production cost is reduced.

In some embodiments of the present application, the junction of the first portion and the second portion or the edge of the first portion is provided with a relief structure.

In some embodiments of the present application, the current collector further includes a second surface opposite to the first surface, the second surface further includes a second blank area, and a projection of the first tab on the second surface is located in the second blank area. The first tab glue comprisesThe second glue film that the glue film is connected, first utmost point ear is located between first glue film and the second glue film, and the second glue film includes the fifth limit towards the second limit. The minimum distance between the fifth edge and the second edge is D₃(mm) then D₃<W is added. The fifth side of the second adhesive layer can be clamped in the electrode assembly, when the electrochemical device is subjected to mechanical abuse, the second adhesive layer is clamped, so that the first tab can be further prevented from being broken due to deflection, the electrochemical device is prevented from being out of work, and the safety, reliability and service life of the electrochemical device are improved.

In some embodiments of the present application, the first blank area is located in the middle of the current collector. Therefore, the internal resistance of the electrochemical device can be reduced, and the high-rate charge and discharge performance of the electrochemical device can be improved.

In some embodiments, the electrochemical device further comprises a second tab, the first surface is provided with a third blank region, and the second tab is electrically connected to the third blank region and protrudes from the first edge. And a second lug glue is arranged on the second lug and comprises a third glue layer, and the third glue layer comprises a sixth edge facing the second edge. Wherein the minimum distance between the sixth side and the second side is D₄(mm) then D₄<W is added. The first pole piece of the electrochemical device is provided with the second pole lug, so that the high-rate charge-discharge performance can be further improved; in addition, the sixth side of the third glue layer can be clamped inside the electrode assembly, and when the electrochemical device is subjected to mechanical abuse, the second electrode lug can be prevented from being broken due to the clamping of the third glue layer, so that the safety reliability and the service life of the electrochemical device are improved.

The present application also provides an electronic device comprising the electrochemical device as above.

Drawings

Fig. 1 is a schematic structural view of an electrochemical device according to an embodiment of the present disclosure.

Fig. 2 is a schematic cross-sectional view of an electrode assembly of the electrochemical device shown in fig. 1.

Fig. 3A is a schematic front view of the electrode assembly shown in fig. 2 with the first electrode sheet unfolded.

Fig. 3B is a schematic back view of the first pole piece shown in fig. 3A.

Fig. 4 is a schematic side view of the first tab on the first pole piece shown in fig. 3A and 3B.

Fig. 5 is a front view schematically illustrating the structure of the electrode assembly of fig. 2 when the first electrode tab is unfolded according to another embodiment.

Fig. 6 is a rear view schematically illustrating the structure of the first electrode sheet of the electrode assembly shown in fig. 2 according to still another embodiment when the first electrode sheet is spread.

Fig. 7 is a schematic side view of the first tab on the first pole piece shown in fig. 6.

Fig. 8 is a front view schematically illustrating a structure of a first electrode sheet of the electrode assembly shown in fig. 2 according to still another embodiment when the first electrode sheet is spread.

Fig. 9 is a schematic diagram of a back structure of the first pole piece shown in fig. 8.

Fig. 10 is a schematic front view of an embodiment of a first tab on the first pole piece shown in fig. 8.

Fig. 11 is a schematic front view of another embodiment of the first tab on the first pole piece shown in fig. 8.

Fig. 12 is a front view schematically illustrating the structure of the electrode assembly of fig. 2 when the first electrode tab is unfolded according to still another embodiment.

Fig. 13 is a front view illustrating a structure of the electrode assembly of fig. 2 when the first electrode tab is unfolded.

Fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Description of the main elements

Electronic device 1

First pole piece 10

Current collector 11

Active material layer 12

First tab 20

First tab glue 30

First adhesive layer 31

Second adhesive layer 32

Second pole piece 40

Second tab 50

Second ear glue 60

Third adhesive layer 61

Fourth adhesive layer 62

Tab 70

Electrochemical device 100

Electrode assembly 101

First side 111

First blank region 112

First side 113

Second side 114

Second side 115

Second blank region 116

Fourth side 117

Third blank area 118

The third side 310

First part 311

Second portion 312

Fifth side 320

Sixth side 610

Distance D₁，D₂，D₃，W

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following embodiments, features of the embodiments may be combined with each other without conflict.

Referring to fig. 1 to 3A, an electrochemical device 100 according to an embodiment of the present disclosure includes a first pole piece 10 and a first tab 20. First pole piece 10 includes current collector 11 and active material layer 12 disposed on current collector 11. The current collector 11 includes a first surface 111, and the first surface 111 is provided with a first blank area 112. The current collector 11 includes a first edge 113 and a second edge 114 disposed opposite to each other, and the first tab 20 is electrically connected to the first blank area 112 and protrudes from the first edge 113.

As shown in fig. 3A, a first tab glue 30 is disposed on the first tab 20, the first tab glue 30 includes a first glue layer 31, and the first glue layer 31 includes a third edge 310 facing the second edge 114. Wherein the minimum distance between the third side 310 and the second side 114 is D₁(mm), the distance between the first edge 113 and the second edge 114 is W (mm), D₁<W。

Wherein, the shape of the third side 310 may be a straight line, a curved line or any other shape. When the third side 310 is a straight line, the third side 310 may be parallel to the first side 113, or may not be parallel to the first side 113. Minimum distance D₁Is the minimum of the distances from the points on the third side 310 to the second side 114.

It will be appreciated that, in particular, as shown in fig. 2, the electrochemical device 100 further comprises a second pole piece 40 and a separator (not shown) located between the first pole piece 10 and the second pole piece 40. The first pole piece 10, the separator, and the second pole piece 40 may be laminated or wound to form the electrode assembly 101. The electrode assembly 101 is shown in a wound form, but the electrode assembly 101 of the present invention is not limited thereto, and the electrode assembly 101 may be a laminated form.

The present application sets a minimum distance D between the third side 310 and the second side 114₁Is smaller than the distance W between the first edge 113 and the second edge 114, so that the third edge 310 of the first glue layer 31 is lower than the first edge 113 of the first pole piece 10. Accordingly, the third side 310 of the first gel layer 31 may be clamped inside the electrode assembly 101. When the electrochemical device 100 is abused mechanically, the first adhesive layer 31 is clamped, so that the first tab 20 can be prevented from being broken due to deflection, the problem of failure of the electrochemical device 100 is avoided, and the service life and the safety and reliability of the electrochemical device 100 are improved.

In one embodiment of the present application, as shown in fig. 3A, a distance W between the first side 113 and the second side 114 and a minimum distance D between the third side 310 and the second side 114₁The difference between them is greater than 0.2mm, i.e. D₁<W-0.2. Therefore, the first adhesive layer 31 can extend into the electrode assembly 101 for a sufficient length, which is beneficial to preventing the first adhesive layer 31 from separating from the first blank area 112 when the electrochemical device 100 is abused mechanically, thereby avoiding the first tab 20 from being broken, and further improving the reliability and the service life of the electrochemical device 100.

The present application will be described in detail with reference to specific examples.

Example 1

As shown in fig. 3A, in the present embodiment, the first glue layer 31 covers part of the first blank area 112, so as to satisfy D₁<W is added. Because the first glue layer 31 covers part of the first blank area 112, the problem that stress concentration is easily generated at the junction of the first tab 20 and the third edge 310 of the first glue layer 31 when a gap exists between the third edge 310 of the first glue layer 31 and the first blank area 112 can be avoided, so that the first tab 20 is prevented from being broken due to stress concentration.

As shown in fig. 3B, the current collector 11 further includes a second surface 115 opposite to the first surface 111, the second surface 115 includes a second blank area 116, and a projection of the first tab 20 on the second surface 115 is located in the second blank area 116. The first tab glue 30 comprises a second glue layer 32 connected with a first glue layer 31, and the 20 th position of the first tabBetween the first glue layer 31 and the second glue layer 32. The second layer of glue 32 includes a fifth edge 320 that faces the second edge 114. The minimum distance between the fifth edge 320 and the second edge 114 is D₃(mm) then D₃<W。

For example, in the present embodiment, the second adhesive layer 32 covers part of the second blank area 116. Because the second glue layer 32 covers part of the second blank area 116, the problem that stress concentration is easily generated at the junction of the first tab 20 and the fifth edge 320 of the second glue layer 32 when a gap exists between the fifth edge 320 of the second glue layer 32 and the second blank area 116 can be avoided, and the first tab 20 is further prevented from being broken due to stress concentration.

The shape of the fifth side 320 may be a straight line, a curved line, or any other shape. When the fifth side 320 is a straight line, the fifth side 320 may be parallel to the first side 113, or may not be parallel to the first side 113. Minimum distance D₁Is the minimum value of the distance from each point on the fifth edge 320 to the second edge 114.

Referring to fig. 3A, 3B and 4 together, the fifth side 320 may be flush with the third side 310. Specifically, when the distance W between the first side 113 and the second side 114 and the minimum distance D between the third side 310 and the second side 114₁The difference between them is greater than 0.2mm (i.e. D)₁<W-0.2), the distance W between the first side 113 and the second side 114 and the minimum distance D between the fifth side 320 and the second side 114₃The difference between them is also greater than 0.2mm (i.e. D)₃<W-0.2)。

As shown in fig. 3A, in the present embodiment, the first blank area 112 is located in the middle of the current collector 11. The first blank area 112 refers to an area on the current collector 11 where the active material layer 12 is not disposed, and may be formed by cleaning the active material layer at a position corresponding to the first blank area 112 after the active material layer 12 is coated on the current collector 11 to expose the current collector, or may be formed by attaching a foam adhesive at a position corresponding to the first blank area 112, and heating to remove the foam adhesive and the active material layer attached thereto after the active material layer 12 is coated, or other methods, which are not limited in this application.

Thus, the first tab 20 may be located in the middle of the current collector 11, thereby reducing the transmission distance of current, reducing the internal resistance of the electrochemical device 100, and improving the high-rate charge-discharge performance of the electrochemical device 100. Of course, as shown in fig. 5, the first blank area 112 may also be located at the head or tail of the current collector 11.

As shown in fig. 3A and 3B, in the present embodiment, the first adhesive layer 31 and the second adhesive layer 32 are matched in shape, and both may be substantially rectangular.

Example 2

Referring to fig. 6, the difference from embodiment 1 is that the second adhesive layer 32 of this embodiment may not cover the second blank area 116 under the condition that the first adhesive layer 31 covers part of the first blank area 112. That is, the fifth edge 320 of the second adhesive layer 32 may have a certain gap from the second blank area 116. At this time, the width of the second glue layer 32 is smaller than that of the first glue layer 31.

The width from the second edge 114 to the first edge 113 is defined as the width of the second adhesive layer 32 or the first adhesive layer 31 along the first direction.

In this case, although there is a gap between the fifth edge 320 of the second adhesive layer 32 and the second blank area 116, which easily causes a problem of stress concentration at the boundary between the fifth edge 320 and the first tab 20, the stress generated at the boundary between the fifth edge 320 and the first tab 20 is at least partially transferred to the first adhesive layer 31 side. Since the first glue layers 31 cover part of the first blank regions 112, part of the stress transferred to the first glue layers 31 is relieved, so that the first tab 20 can also be prevented from being broken due to stress concentration.

Example 3

The difference from embodiment 1 or 2 is that the shape of the first paste layer 31 is not limited to a rectangle. As shown in fig. 8, in the present embodiment, along the first direction, the first glue layer 31 includes a first portion 311 and a second portion 312 connected to the first portion 311, the third edge 310 is located at the first portion 311, and the length of the first portion 311 is smaller than that of the second portion 312.

That is, the first portion 311 covers a part of the first blank area 112.

The first portion 311 and the second portion 312 may be integrally formed, which saves the process, and certainly may not be integrally formed.

The length is defined as a dimension of the first portion 311 or the second portion 312 along a second direction perpendicular to the first direction. The length of the first portion 311 is smaller than that of the second portion 312, i.e. the first glue layer 31 is substantially T-shaped. Because the length of the first portion 311 is smaller than that of the second portion 312, the material of the first portion 311 of the first adhesive layer 31 can be saved, and the production cost can be reduced.

Similarly, the second adhesive layer 32 may have the same shape as the first adhesive layer 31, i.e., the second adhesive layer 32 may also be substantially T-shaped. When the first portion 311 of the first adhesive layer 31 covers part of the first blank region 112, the second adhesive layer 32 may cover part of the second blank region 116, similar to embodiment 1.

Example 4

The difference from embodiment 3 is that when the first adhesive layer 31 is T-shaped, the second adhesive layer 32 of this embodiment does not cover the second blank area 116, i.e., as shown in fig. 9, the second adhesive layer 32 and the second blank area 116 have a certain gap.

Due to the different sizes of the first portion 311 and the second portion 312 of the first glue layer 31, stress is more likely to occur in the first glue layer 31 at the junction of the first gate and the second portion 312, so that the stress of the second glue layer 32 is more quickly transferred to the first glue layer 31, thereby preventing the first tab 20 from being broken due to stress concentration.

As shown in fig. 10 and 11, in the present embodiment, a connection between the first portion 311 and the second portion 312 or an edge of the first portion 311 may be provided with a concave-convex structure 313. The concavo-convex structure 313 may be a saw-tooth structure. The concavo-convex structure 313 serves to generate a sharply changed shape on the first adhesive layer 31, thereby allowing the stress of the second adhesive layer 32 to be more rapidly transferred to the first adhesive layer 31.

Of course, the difference between the lengths of the first portion 311 and the second portion 312 can be increased correspondingly, which is also beneficial to make the stress of the second adhesive layer 32 transfer to the first adhesive layer 31 more quickly.

Example 5

The difference from the embodiment 1 is thatTo satisfy D₁<W, the first tab 20 need not cover the first blank area 112. As shown in fig. 12, in the present embodiment, the first blank area 112 includes a fourth edge 117, the fourth edge 117 is far from the second edge 114, and a distance D is between the fourth edge 117 and the second edge 114₂(mm) then D₂<D₁。

As shown in fig. 12, in particular, the first blank area 112 is provided with a notch, so that a fourth edge 117 is formed on the first blank area 112. In this case, although there is a certain gap between the third edge 310 of the first adhesive layer 31 and the first blank area 112, for the winding-type electrode assembly 101, since the third edge 310 of the first adhesive layer 31 is lower than the first edge 113 of the first electrode layer 10 after the first electrode layer 10 is wound, the third edge 310 of the first adhesive layer 31 can be clamped by the other areas of the first edge 113 without a notch, and the first tab 20 can be prevented from being broken due to deflection.

As shown in fig. 12, the first adhesive layer 31 may have a rectangular shape, similar to that of embodiment 1. However, as shown in fig. 13, the first adhesive layer 31 may also be T-shaped as described in embodiment 2.

Further, the second glue layer 32 may match the shape of the first glue layer 31, or may have a smaller width than the first glue layer 31.

In the above embodiments 1 to 5, the first tab 20 may be welded to the first blank area 112. In other embodiments, the first tab 20 may also be integrally formed in the first blank area 112, for example, the first tab 20 is directly cut from the current collector.

As shown in fig. 2 and 3A, in the present embodiment, the electrochemical device 100 further includes a second tab 50. The first surface 111 is further provided with a third blank area 118, and the second tab 50 is electrically connected to the third blank area 118 and protrudes from the first edge 113. The second tab 50 is provided with a second tab glue 60. The second ear glue 60 comprises a third glue layer 61, the third glue layer 61 comprising a sixth edge 610 facing the second edge 114. Wherein the minimum distance between the sixth side 610 and the second side 114 is D₄(mm) then D₄<W。

Wherein, the shape of the sixth side 610 may be a straight line, a curved line or otherAny shape. When the sixth side 610 is a straight line, the sixth side 610 may be parallel to the first side 113, or may not be parallel to the first side 113. Minimum distance D₁Is the minimum value of the distance from each point on the sixth edge 610 to the second edge 114.

When the first pole piece 10 is further provided with the second tab 50, the number of the tabs on the first pole piece 10 is increased, so that the high-rate charge and discharge performance of the electrochemical device 100 can be improved. The present application provides that the third layer of glue 61 has a similar structure to the first layer of glue 31, i.e. a minimum distance D between the sixth edge 610 and the second edge 114₄The distance W between the first edge 113 and the second edge 114 is smaller, so that the sixth edge 610 of the third glue layer 61 is lower than the first edge 113 of the first pole piece 10, and therefore the second pole tab 50 can be prevented from being broken due to deflection, and the safety reliability and the service life of the electrochemical device 100 are further improved.

As shown in fig. 3B, the second tab glue 60 may further include a fourth glue layer 62 connecting the third glue layers 61. The third adhesive layer 61 and the fourth adhesive layer 62 of the second tab adhesive 60 may adopt the same configurations as the first adhesive layer 31 and the second adhesive layer 32 of the first tab adhesive 30 of embodiments 1 to 5, respectively, and will not be described again.

In order to further improve the high-rate charge-discharge performance of the electrochemical device 100, a third tab, a fourth tab (not shown), and other tabs such as the third tab and the fourth tab may be further disposed on the first pole piece 10. In order to avoid the fracture of the third tab and the fourth tab, the tab glue structure of the third tab and the fourth tab may be similar to the first tab glue 30 of embodiments 1 to 5, and will not be described herein.

Similarly, as shown in fig. 2, the second pole piece 40 is also provided with at least one tab 70, and specifically, the second pole piece 40 includes a second current collector and a second active material layer disposed on the second current collector. The second mass flow body includes first face, and first face also is equipped with first blank area. The second current collector also includes oppositely disposed first and second sides. The tab 70 of the second pole piece 40 is electrically connected to the first blank area of the second current collector and protrudes from the first edge. The tabs 70 on the second pole piece 40 are also provided with tab glue (not shown). In order to avoid the fracture of the tab 70 on the second pole piece 40, the configuration of the tab glue on the second pole piece 40 may be similar to that of the first tab glue 30 of embodiments 1 to 5, and will not be described herein.

The electrochemical device 100 of the present application includes all devices capable of electrochemical reaction. Specifically, the electrochemical device 100 includes all kinds of primary batteries, secondary batteries, fuel cells, solar cells, and capacitors (e.g., super capacitors). Alternatively, the electrochemical device 100 may be a lithium secondary battery including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, and a lithium ion polymer secondary battery.

The electrochemical devices of examples 1 to 5 were each subjected to a slight drop test, specifically, each electrochemical device was placed in a complete machine simulation jig, fixed with a double-sided adhesive tape, and covered with a cover plate. Dropping from a height of 10cm to the marble floor, and sequentially and repeatedly dropping each electrochemical device for multiple times, wherein the head of each electrochemical device is dropped 5000 times, the left side is dropped 2500 times, and the right side is dropped 2500 times. It was confirmed that the electrochemical devices of examples 1 to 5 had no breakage of the tabs after the multiple dropping.

Referring to fig. 14, an electronic device 1 is further provided in an embodiment of the present application, where the electronic device 1 includes an electrochemical device 100. The electronic device 1 may be a consumer electronic product (such as a mobile communication device, a tablet computer, a notebook computer, a wearable device, etc.), an electric tool, an unmanned aerial vehicle, an energy storage device, a power device, etc. Referring to the drawings, in one embodiment, an electronic device 1 is a mobile communication device.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.