Electrochemical devices, battery modules, and electronic devices

Abstract

The present application relates to the field of energy storage technology, and in particular discloses an electrochemical device, a battery module and an electronic device. The electrochemical device includes an electrode assembly, a pole ear and a shell, the shell includes a main body, 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 of the pole ear extends from the first side of the main body, the shell includes a tail seal, a first connecting portion and a first side seal, the tail seal and the first side seal are respectively connected to the second side and the third side of the main body, the third side is located between the second side and the first side that are oppositely arranged, and the first side seal is connected to the tail seal through the first connecting portion; the tail seal is configured to be folded in a first direction, and the first side seal is configured to be folded in a second direction, so that the first connecting portion is close to the second side of the main body, the first direction is perpendicular to the direction from the first side to the second side, and the first direction is opposite to the second direction. In the above manner, the present application can improve the energy density.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an electrochemical device, a battery module and an electronic device. Background Art

[0002] With the rapid development of electronic products and power tool industries, many electronic products are developing towards the direction of being easy to carry and small in size, such as mobile phones. The space left for electrochemical devices in these electronic products is also increasingly limited. Therefore, how to improve the energy density of electrochemical devices in a limited space is becoming increasingly important. At present, electrochemical devices are usually composed of an electrode assembly and an aluminum-plastic film that wraps the electrode assembly. The edges of the aluminum-plastic film usually need to be sealed so that the inside of the shell formed by the aluminum-plastic film can be loaded with electrolyte. However, the edges of the shell will occupy a certain space, resulting in a decrease in energy density, which brings inconvenience. Summary of the invention

[0003] The main technical problem solved by the present application is to provide an electrochemical device, a battery module and an electronic device, which can reduce the area occupied by the electrochemical device and improve the energy density.

[0004] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide an electrochemical device, including an electrode assembly, a pole ear and a shell, the shell including a main body, the electrode assembly is accommodated in the shell, one end of the pole ear is connected to the electrode assembly, and the other end of the pole ear extends from the first side of the main body, the shell includes a tail seal, a first connecting portion and a first side seal, the tail seal is connected to the second side of the main body, the first side seal is connected to the third side of the main body, the first side and the second side are arranged oppositely, the third side is located between the second side and the first side, and the first side seal is connected to the tail seal through the first connecting portion. Wherein, the tail seal is configured to be folded toward a first direction, and the first side seal is configured to be folded toward a second direction so that the first connecting portion is closely attached to the second side of the main body, the first direction is perpendicular to the direction from the first side to the second side, and the first direction is opposite to the second direction.

[0005] Optionally, the first connecting portion includes a first part, the first part is the overlapping part of the first connecting portion and the tail sealing portion, the first part includes a first edge, the first edge is the end edge where the first connecting portion and the tail sealing portion are connected, the tail sealing portion includes a first sealing edge, the first sealing edge is the end edge where the tail sealing portion is connected to the main body, and the angle between the first edge and the first sealing edge is α, and the angle α is less than 90 degrees.

[0006] Optionally, the angle α ranges from 30 degrees to 60 degrees.

[0007] Optionally, the first connecting portion further includes a second portion, the second portion is connected to the first portion, the second portion includes a second side and a third side that are arranged opposite to each other, the third side being an end side connecting the second portion to the first portion. The main body includes a first surface, the first surface being an end surface of the main body that is closest to the second side in the second direction, wherein along the second direction, the distance between the second side and the third side is d1, the distance between the third side and the first surface is d2, and d2≥d1.

[0008] Optionally, the tail seal portion further includes a second sealing edge, the second sealing edge and the first sealing edge are two oppositely disposed edges, the main body further includes a second surface, the second surface is the end surface of the main body closest to the second sealing edge in the first direction. Along the first direction, the distance between the first sealing edge and the second sealing edge is d3, the distance between the first sealing edge and the second surface is d4, and d4≥d3.

[0009] Optionally, the first side sealing portion includes a third sealing edge and a fourth sealing edge that are relatively arranged, the third sealing edge being the end edge where the first side sealing portion is connected to the main body, and along the second direction, the distance between the third sealing edge and the fourth sealing edge is d5, and the distance between the third sealing edge and the first surface is d6, and d6≥d5.

[0010] Optionally, the main body includes a fourth side surface, and the fourth side surface is arranged opposite to the third side surface. The shell further includes a second connecting portion and a second side sealing portion, the second side sealing portion is connected to the fourth side surface of the main body, and the second side sealing portion is connected to the tail sealing portion through the second connecting portion. The second side sealing portion is configured to be folded toward a second direction so that the second connecting portion is closely attached to the second side surface of the main body.

[0011] Optionally, the shell further includes a top seal portion, the top seal portion is connected to the first side surface of the main body, and the top seal portion and the tail seal portion are respectively located at two opposite ends of the main body. One end of the pole ear is connected to the electrode assembly, and the other end of the pole ear passes through the shell from the top seal portion.

[0012] Optionally, the electrode assembly includes a first pole piece, a second pole piece and a separation membrane, the separation membrane is located between the first pole piece and the second pole piece, and the first pole piece, the separation membrane and the second pole piece are stacked and wound.

[0013] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a battery module, comprising an electrochemical device as described in any one of the above.

[0014] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide an electronic device, comprising the electrochemical device or the battery module as described in any one of the above.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the electrochemical device provided by the present application includes an electrode assembly, a pole ear and a shell. The shell includes a main body, the electrode assembly is accommodated in the shell, one end of the pole ear is connected to the electrode assembly, and the other end of the pole ear extends from the first side of the main body. Specifically, the shell also includes a tail seal, a first connecting portion and a first side seal, the tail seal is connected to the second side of the main body, the first side seal is connected to the third side of the main body, the first side and the second side are arranged oppositely, the third side is located between the second side and the first side, and the first side seal is connected to the tail seal through the first connecting portion. Wherein, the tail seal is configured to be folded in a first direction, and the first side seal is configured to be folded in a second direction so that the first connecting portion is close to the second side of the main body, the first direction is perpendicular to the direction from the first side to the second side, and the first direction is opposite to the second direction. In the above manner, the main body of the shell can accommodate the electrode assembly, and the tail seal portion, the first connecting portion and the first side seal portion of the shell can be attached to the main body by folding, thereby reducing the area occupied by the electrochemical device. There is no need to avoid the shell when installing other components, thereby improving the energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0017] Figure 1 is a front view of an electrochemical device provided in one embodiment of the present application;

[0018] Figure 2 is a three-dimensional diagram of an electrochemical device provided in one embodiment of the present application;

[0019] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0020] Figure 4 is a bottom view of an electrochemical device provided in one embodiment of the present application;

[0021] In the figure:

[0022] 100. Electrochemical device;

[0023] 10. Shell; 11. Main body; 111. First side; 112. Second side; 113. Third side; 114. Fourth side; 115. First surface; 116. Second surface; 12. Tail seal; 121. First sealing edge; 122. Second sealing edge; 13. First connecting portion; 131. First part; 1311. First edge; 132. Second part; 1321. Second edge; 1322. Third edge; 14. First side seal; 141. Third sealing edge; 142. Fourth sealing edge; 15. Second connecting portion; 16. First side seal; 17. Top seal; 20. Tab;

[0024] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0027] See also Figure 1 and Figure 2 An embodiment of the present application provides an electrochemical device 100, which includes a housing 10, an electrode assembly (not shown) and a tab 20. The electrode assembly is accommodated in the housing 10, one end of the tab 20 is connected to the electrode assembly, and the other end of the tab 20 extends from the body 11 to the outside of the housing 10.

[0028] For the above housing 10, please combine Figure 2-Figure 4The housing 10 includes a main body 11, a tail seal portion 12, a first connection portion 13, and a first side seal portion 14, and the electrode assembly is accommodated in the main body 11. The main body 11 includes a first side surface 111, a second side surface 112, a third side surface 113, a fourth side surface 114, a first surface 115, and a second surface 116. The first side surface 111 and the second side surface 112 are arranged opposite to each other, the third side surface 113 and the fourth side surface 114 are arranged opposite to each other, the third side surface 113 and the fourth side surface 114 are located between the second side surface 112 and the first side surface 111, the first surface 115 and the second surface 116 are arranged opposite to each other, and the first surface 115 and the second surface 116 are connected to the first side surface 111, the second side surface 112, the third side surface 113, and the fourth side surface 114, respectively.

[0029] The other end of the tab 20 extends from the first side surface 111 of the main body 11. The tail seal 12 is connected to the second side surface 112 of the main body 11, the first side seal 14 is connected to the third side surface 113 of the main body 11, and the first side seal 14 is connected to the tail seal 12 through the first connecting portion 13. The tail seal 12 is configured to be folded toward a first direction X, and the first side seal 14 is configured to be folded toward a second direction Y, so that the first connecting portion 13 is closely attached to the second side surface 112 of the main body 11, the first direction X is perpendicular to the direction from the first side surface 111 to the second side surface 112, and the first direction X is opposite to the second direction Y. In other words, the bending directions of the first side seal 14 and the tail seal 12 are opposite.

[0030] For the tail seal 12, please combine Figure 3 and Figure 4 The tail seal portion 12 includes a first sealing edge 121 and a second sealing edge 122. The first sealing edge 121 is the end edge where the tail seal portion 12 is connected to the main body 11, and the second sealing edge 122 is arranged opposite to the first sealing edge 121. In the first direction X, the second sealing edge 122 is closer to the second surface 116 than the first sealing edge 121. In other words, the second surface 116 is the end surface of the main body 11 closest to the second sealing edge 122 in the first direction X. In the direction perpendicular to the first direction, the length of the first sealing edge 121 is greater than the length of the second sealing edge 122, and the shape of the tail seal portion 12 is trapezoidal.

[0031] In some embodiments, along the first direction X, the distance between the first sealing edge 121 and the second sealing edge 122 is d3, and the distance between the first sealing edge 121 and the second surface 116 is d4, and d4≥d3, so that the tail seal portion 12 does not protrude from the second surface 116 of the main body 11 along the first direction X. Compared with the manner in which the tail seal portion 12 protrudes from the second surface 116 of the main body 11 along the first direction X, the manner in which the tail seal portion 12 does not protrude from the second surface 116 of the main body 11 along the first direction X can reduce the area occupied by the electrochemical device 100, which is beneficial to improving the energy density.

[0032] For the first connecting portion 13, please combine Figure 4 The first connecting portion 13 includes a first portion 131 and a second portion 132, wherein the first portion 131 is a portion where the first connecting portion 13 overlaps with the tail seal portion 12, the second portion 132 is connected to the first portion 131, and the other end of the second portion 132 is connected to the first side seal portion 14. The cross-section of the first portion 131 along the first direction X is triangular. Specifically, the first portion 131 includes a first edge 1311, wherein the first edge 1311 is an end edge where the first connecting portion 13 is connected to the tail seal portion 12, and an angle α is less than 90 degrees between the first edge 1311 and the first sealing edge 121. In some embodiments, the angle α ranges from 30 degrees to 60 degrees.

[0033] The cross-section of the second portion 132 along the first direction X is rectangular. Specifically, the second portion 132 includes a second side 1321 and a third side 1322 that are arranged opposite to each other, and the third side 1322 is an end side connecting the second portion 132 and the first portion 131. In the second direction Y, the second side 1321 is closer to the first surface 115 than the third side 1322. In other words, the first surface 115 is the end surface of the body 11 that is closest to the second side 1321 in the second direction Y.

[0034] In some embodiments, along the second direction Y, the distance between the second edge 1321 and the third edge 1322 is d1, and the distance between the third edge 1322 and the first surface 115 is d2, and d2≥d1, so that the first connecting portion 13 does not protrude from the first surface 115 of the main body 11 along the second direction Y, thereby further reducing the area occupied by the electrochemical device 100, which is beneficial to improving the energy density.

[0035] For the first side seal portion 14, please combine Figure 3The first side sealing portion 14 includes a third sealing edge 141 and a fourth sealing edge 142 which are arranged opposite to each other. The third sealing edge 141 is an end edge where the first side sealing portion 14 is connected to the main body 11. The cross section of the first side sealing portion 14 along the first direction X is rectangular.

[0036] In some embodiments, along the second direction Y, the distance between the third sealing edge 141 and the fourth sealing edge 142 is d5, and the distance between the third sealing edge 141 and the first surface 115 is d6, d6≥d5, so that the first side sealing portion 14 does not protrude from the first surface 115 of the main body 11 along the second direction Y, thereby further reducing the area occupied by the electrochemical device, which is beneficial to improving the energy density.

[0037] It should be noted that even though the shape of the electrochemical device 100 in the drawings of the above embodiments is a regular hexahedron, the present application is not limited thereto. In other embodiments of the present application, the electrochemical device 100 and the housing 10 may also be other shapes, as long as the tail seal 12, the first connection portion 13 and the first side seal 14 can be folded and attached to the main body 11 during the bending process. For example: when the main body is another polyhedron, the energy density can be improved as long as the following conditions are met: the tail seal and the first side seal are respectively connected to two adjacent surfaces of the main body, and the tail seal and the first side seal are respectively folded and attached to the two adjacent surfaces in opposite directions, and the first connection portion connected to the tail seal and the first side seal is folded and attached to any one of the two adjacent surfaces.

[0038] Please refer again Figure 2 The housing 10 further includes a second connection portion 15 and a second side sealing portion 16, wherein the second side sealing portion 16 is connected to the fourth side surface 114 of the main body 11, and the second side sealing portion 16 is connected to the tail sealing portion 12 via the second connection portion 15. The second side sealing portion 16 is configured to be folded toward the second direction Y so that the second connection portion 15 is closely attached to the second side surface 112 of the main body 11, so as to reduce the area occupied by the electrochemical device 100, which is conducive to improving the energy density.

[0039] It can be understood that the structure of the second connection portion 15 is similar to that of the first connection portion 13 , and will not be described in detail here.

[0040] For the above-mentioned electrode assembly, the electrode assembly includes a first pole piece (not shown), a second pole piece (not shown) and an isolation membrane (not shown), the isolation membrane is located between the first pole piece and the second pole piece, and the first pole piece, the isolation membrane and the second pole piece are stacked and wound.

[0041] For the above-mentioned tab 20, please refer again to Figure 2 The housing 10 further includes a top seal 17, which is connected to the first side surface 111 of the main body 11, and the top seal 17 and the tail seal 12 are respectively located at two opposite ends of the main body 11, one end of the two pole tabs 20 is respectively connected to the first pole piece and the second pole piece, and the other ends of the two pole tabs 20 pass through the first side surface 111 of the main body 11 and the top seal 17 to pass out of the housing 10.

[0042] An electrochemical device 100 provided in an embodiment of the present application includes an electrode assembly, a tab 20 and a shell 10. The shell 10 includes a main body 11, the electrode assembly is accommodated in the main body 11, one end of the tab 20 is connected to the electrode assembly, and the other end of the tab 20 extends from the first side 111 of the main body 11. Specifically, the shell 10 also includes a tail seal 12, a first connecting portion 13 and a first side seal 14, the tail seal 12 is connected to the second side 112 of the main body 11, the first side seal 14 is connected to the third side 113 of the main body 11, the first side 111 and the second side 112 are arranged opposite to each other, the third side 113 is located between the second side 112 and the first side 111, and the first side seal 14 is connected to the tail seal 12 through the first connecting portion 13. The tail seal portion 12 is configured to be folded toward a first direction X, and the first side seal portion 14 is configured to be folded toward a second direction Y, so that the first connection portion 13 is closely attached to the second side surface 112 of the main body 11, the first direction X is perpendicular to the direction from the first side surface 111 to the second side surface 112, and the first direction X is opposite to the second direction Y. In the above manner, the main body 11 of the shell 10 can accommodate the electrode assembly, and the tail seal portion 12, the first connection portion 13 and the first side seal portion 14 of the shell 10 can be attached to the main body 11 by folding, so that the area occupied by the electrochemical device 100 can be reduced, and there is no need to avoid the shell 10 when installing other components, thereby improving the energy density.

[0043] An embodiment of the present application further provides a battery module, wherein the battery module includes the electrochemical device 100. The structure of the electrochemical device 100 may refer to the above embodiments, and will not be described in detail here.

[0044] One embodiment of the present application also provides an electronic device, which includes the above-mentioned electrochemical device 100 or the above-mentioned battery module. The structure of the electrochemical device 100 and / or the battery module can be referred to the above-mentioned embodiments, and will not be described one by one here. In this embodiment, the electronic device is a mobile phone; it is understood that in other embodiments of the present application, the electronic device can also be a tablet computer, a computer, a drone, or other electrical devices that need to be driven by electricity.

[0045] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. An electrochemical device, comprising an electrode assembly, a tab and a shell, wherein the shell comprises a main body, the electrode assembly is accommodated in the shell, one end of the tab is connected to the electrode assembly, and the other end of the tab extends from a first side surface of the main body, characterized in that: The shell comprises a top seal portion, a tail seal portion, a first connecting portion and a first side seal portion, wherein the top seal portion is connected to the first side surface of the main body, the tail seal portion is connected to the second side surface of the main body, the top seal portion and the tail seal portion are respectively located at two opposite ends of the main body, the first side seal portion is connected to the third side surface of the main body, the first side surface and the second side surface are arranged opposite to each other, the third side surface is located between the second side surface and the first side surface, and the first side seal portion is connected to the tail seal portion through the first connecting portion; The tail seal portion is configured to be folded toward a first direction, and the first side seal portion is configured to be folded toward a second direction, so that the first connection portion is closely attached to the second side surface of the main body, the first direction is perpendicular to the direction from the first side surface to the second side surface, and the first direction is opposite to the second direction; One end of the electrode tab is connected to the electrode assembly, and the other end of the electrode tab passes through the shell from the top seal portion.

2. The electrochemical device according to claim 1, characterized in that The first connecting portion includes a first part, which is the part where the first connecting portion overlaps with the tail sealing portion, and the first part includes a first edge, which is the end edge where the first connecting portion is connected to the tail sealing portion, and the tail sealing portion includes a first sealing edge, which is the end edge where the tail sealing portion is connected to the main body, and the angle between the first edge and the first sealing edge is α, and the angle α is less than 90 degrees.

3. The electrochemical device according to claim 2, characterized in that The angle α ranges from 30 degrees to 60 degrees.

4. The electrochemical device according to claim 2, characterized in that The first connecting portion further includes a second portion, the second portion is connected to the first portion, the second portion includes a second side and a third side that are arranged opposite to each other, the third side is an end side that connects the second portion to the first portion; the main body includes a first surface, the first surface is an end surface of the main body that is closest to the second side in the second direction, Wherein, along the second direction, the distance between the second side and the third side is d1, the distance between the third side and the first surface is d2, and d2≥d1.

5. The electrochemical device according to claim 2, characterized in that The tail seal portion further includes a second sealing edge, which is opposite to the first sealing edge. The main body further includes a second surface, which is the end surface of the main body closest to the second sealing edge in the first direction. Along the first direction, the distance between the first sealing edge and the second sealing edge is d3, the distance between the first sealing edge and the second surface is d4, and d4≥d3.

6. The electrochemical device according to claim 4, characterized in that The first side sealing portion includes a third sealing edge and a fourth sealing edge which are arranged opposite to each other, and the third sealing edge is an end edge where the first side sealing portion is connected to the main body. Along the second direction, the distance between the third sealing edge and the fourth sealing edge is d5, the distance between the third sealing edge and the first surface is d6, and d6≥d5.

7. The electrochemical device according to claim 1, characterized in that The main body includes a fourth side surface, and the fourth side surface is arranged opposite to the third side surface; The housing further comprises a second connecting portion and a second side sealing portion, wherein the second side sealing portion is connected to the fourth side surface of the main body, and the second side sealing portion is connected to the tail sealing portion through the second connecting portion; The second side sealing portion is configured to be folded toward a second direction so that the second connecting portion is closely attached to the second side surface of the main body.

8. The electrochemical device according to claim 1, characterized in that The electrode assembly includes a first pole piece, a second pole piece and a separation film, wherein the separation film is located between the first pole piece and the second pole piece, and the first pole piece, the separation film and the second pole piece are stacked and wound.

9. A battery module, characterized in that: The invention comprises an electrochemical device as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: The invention comprises the electrochemical device according to any one of claims 1 to 8 or the battery module according to claim 9.

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