Electrochemical apparatus and electrical device

Abstract

An electrochemical apparatus (100) and an electrical device. The electrochemical apparatus (100) comprises: a housing (1), a first feedthrough member (7), an electrode assembly (2), and a first tab (3). The housing (1) is provided with an accommodation cavity (14), and the electrode assembly (2) is accommodated in the accommodation cavity (14). The housing (1) comprises a first side plate (131), and the first feedthrough member (7) passes through the first side plate (131) and is insulated from the first side plate (131). The first tab (3) is connected to the electrode assembly (2). The electrochemical apparatus (100) further comprises a first adapter (5), and the first adapter (5) is accommodated in the accommodation cavity (14). The first tab (3) is provided with a first bending groove (324). One end of the first adapter (5) is connected to a groove wall of the first bending groove (324), and the other end of the first adapter (5) is electrically connected to the first feedthrough member (7). In a thickness direction of the first side plate (131), a projection of the first tab (3) does not overlap a projection of the first feedthrough member (7). The above configuration helps to shorten the size of the electrochemical apparatus (100) in the width direction, and if the width of the electrochemical apparatus (100) is unchanged, more space can be allocated for the electrode assembly (2), helping to enhance the energy density of the electrochemical apparatus (100).

Description

Electrochemical device and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application entitled “An electrochemical device and electrical equipment” filed with the China Patent Office on August 30, 2023, with application number 202311108445.7, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments of the present invention relate to the field of battery technology, and in particular to an electrochemical device and electrical equipment. Background Art

[0004] In the battery field, the portion where the tab or post leads out is usually called the cell header. In the prior art, the tab and feedthrough are usually stacked, resulting in a larger cell header, which occupies more space inside the battery and causes a loss of energy density.

[0005] Application Contents

[0006] The embodiments of the present invention provide an electrochemical device and an electrical equipment, aiming to solve the problem of a large space occupied by a battery cell head.

[0007] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide an electrochemical device, comprising: a shell, a first feedthrough, an electrode assembly and a first pole ear, the shell is provided with a receiving cavity, the electrode assembly is received in the receiving cavity, the shell comprises a first side plate, the first feedthrough is passed through the first side plate, the first feedthrough is insulated from the first side plate, the first pole ear is connected to the electrode assembly, the electrochemical device also comprises a first adapter, the first adapter is received in the receiving cavity, the first pole ear comprises a first connecting portion and a first bending portion, one end of the first connecting portion is connected to the electrode assembly, the other end of the first connecting portion is connected to the first bending portion, one end of the first adapter is electrically connected to the first bending portion, the other end of the first adapter is electrically connected to the first feedthrough, and along the thickness direction of the first side plate, the projection of the first pole ear does not overlap with the projection of the first feedthrough. In an embodiment of the present invention, the electrode assembly is accommodated in the outer shell, the first feedthrough is provided in the first side plate of the outer shell, one end of the first pole ear is connected to the electrode assembly, the other end of the first pole ear is connected to one end of the first adapter, and the other end of the first adapter is connected to the first feedthrough. Along the thickness direction of the first side plate, the projection of the first pole ear on the first side plate and the projection of the first feedthrough on the first side plate do not overlap, so that the first pole ear and the first feedthrough are staggered, avoiding the first pole ear and the first feedthrough from being stacked in the thickness direction of the first side plate, which is beneficial to shortening the size of the electrochemical device in the width direction, or, when the width direction of the electrochemical device remains unchanged, more space can be left for the electrode assembly, which is beneficial to improving the energy density of the electrochemical device.

[0008] Optionally, the first bending portion is formed with a first bending groove, one end of the first adapter is inserted into the first bending groove, and one end of the first adapter is connected to the groove wall of the first bending groove. The first bending portion will form an R angle at the bending position, resulting in a gap. Inserting one end of the first adapter into the first bending groove can effectively utilize the gap and avoid wasting the head space of the battery cell.

[0009] Optionally, the first bent portion includes a first inclined portion, a first bent portion, and a first straight portion, wherein the first inclined portion is connected to the other end of the first connecting portion, and both ends of the first bent portion are connected to the first inclined portion and the first straight portion, respectively. The first inclined portion, the first bent portion, and the first straight portion collectively enclose a first bending groove, and the surface of the first straight portion facing the first bending groove is connected to one end of the first adapter. In this way, the first adapter and the first tab are prevented from overlapping, while increasing the connection strength between the first adapter and the first tab.

[0010] Optionally, the electrochemical device further includes a first insulating sheet disposed between the first straight portion and the first side plate along the thickness direction of the first side plate, the first insulating sheet being configured to insulate the first straight portion from the first side plate. Thus, the first straight portion and the first side plate are insulated.

[0011] Optionally, a distance A between a surface of the first side plate proximate to the electrode assembly and an end of the electrode assembly proximate to the first side plate satisfies the following relationship: 1.4 mm ≤ A ≤ 2.2 mm. This allows for a more compact structure of the electrochemical device and improves its energy density.

[0012] Optionally, a distance B between a surface of the first side plate near the electrode assembly and a surface of the first adapter near the electrode assembly satisfies the following relationship: 0.2 mm ≤ B ≤ 2.2 mm. This allows for a more compact structure of the electrochemical device and improves its energy density.

[0013] Optionally, there are multiple first connecting portions, one end of each of the multiple first connecting portions is connected to the electrode assembly, and the other end of each of the multiple first connecting portions is connected to the first bending portion, so that the first electrode tab is connected to the electrode assembly.

[0014] Optionally, the electrode assembly includes a first electrode sheet, a separator, and a second electrode sheet, which are stacked and wound in sequence, and a coil of the first electrode sheet is connected to a first connecting portion, thereby forming the electrode assembly.

[0015] Optionally, the electrode assembly includes a first electrode piece, a diaphragm, and a second electrode piece, wherein the first electrode piece, the diaphragm, and the second electrode piece are each provided in a plurality, the first electrode pieces and the second electrode pieces are alternately stacked in sequence, a diaphragm is located between adjacent first electrode pieces and second electrode pieces, and a first electrode piece is connected to a first connecting portion. Thus, the electrode assembly is formed.

[0016] Optionally, the first feedthrough includes a first post and a first insulating sleeve, the first side plate is provided with a first mounting hole, the first insulating sleeve is disposed in the first mounting hole, one end of the first post is located in the receiving cavity, one end of the first post is connected to the first tab, and the other end of the first post passes through the first insulating sleeve and extends outside the housing, thereby achieving electrical connection between the first post and the first adapter.

[0017] Optionally, the electrode assembly further includes a second tab, one end of which is connected to the electrode assembly, and the other end of which is electrically connected to the housing, so as to provide electrical connection between the second tab and the housing.

[0018] Optionally, the electrode assembly further includes a second tab and a second feedthrough, the second feedthrough being disposed through the housing and insulated from the housing, one end of the second tab being electrically connected to the electrode assembly, and the other end of the second tab being electrically connected to the second feedthrough, thereby providing electrical continuity between the second tab and the feedthrough.

[0019] Optionally, the housing includes a bottom plate and a surrounding plate, the surrounding plates being circumferentially enclosed, the bottom plate being connected to one side of the surrounding plates to form a mounting shell, the mounting shell having a receiving cavity with an opening, the first bending groove being positioned closer to the opening relative to the bottom wall, such that the electrode assembly can be flipped around the bending groove when being installed into the receiving cavity. This allows for faster installation of the electrode assembly into the receiving cavity with less interference from the bottom wall.

[0020] Optionally, the housing further comprises a top plate connected to the other side of the enclosure plate to seal the opening, thereby sealing the opening of the receiving cavity.

[0021] In a second aspect of the present application, an electrical device is provided, comprising the electrochemical device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for describing the specific embodiments or the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0023] FIG1 is an exploded view of an electrochemical device according to an embodiment of the present invention;

[0024] FIG2 is a schematic diagram of the cell head structure of an electrochemical device according to one embodiment of the present invention;

[0025] FIG3 is a schematic structural diagram of a housing of an electrochemical device according to one embodiment of the present invention;

[0026] FIG4 is a front view of FIG2;

[0027] FIG5 is a partial cross-sectional view of an electrochemical device according to an embodiment of the present invention;

[0028] FIG6 is a partial cross-sectional view of an electrochemical device according to an embodiment of the present invention;

[0029] FIG7 is a partial cross-sectional view of an electrochemical device according to an embodiment of the present invention;

[0030] FIG8 is a schematic diagram of the assembly of an electrochemical device according to an embodiment of the present invention, wherein the diagram is drawn in perspective.

[0031] Description of reference numerals: 100, electrochemical device; 1, housing; 11, top plate; 12, bottom plate; 13, enclosure; 131, First side plate; 132, second side plate; 133, third side plate; 134, fourth side plate; 135, fifth side plate; 136, sixth side plate; 1311, first mounting hole; 14, receiving cavity; 2, electrode assembly; 21, first pole piece; 22, second pole piece; 3, first pole ear; 31, first connecting portion; 32, first bending portion; 321, first inclined portion; 322, first bending portion; 323, first straight portion; 324, first bending groove; 4, second pole ear; 41, second connecting portion; 42, second bending portion; 421, second inclined portion; 422, second bending portion; 423, second straight portion; 424, second bending groove; 5, first adapter; 6, second adapter; 7, first feed-through; 71, first pole; 72, first insulating sleeve; 8, first insulating sheet. DETAILED DESCRIPTION

[0032] For ease of understanding of the present invention, the present invention will be 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.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this invention belongs. The terms used in this specification and in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0034] Referring to Figures 1 and 2, the electrochemical device 100 includes a housing 1, an electrode assembly 2, a first electrode tab 3, a second electrode tab 4, a first adapter 5, a second adapter 6, and a first feedthrough 7. The electrode assembly 2 is housed in the housing 1, one end of the first electrode tab 3 is electrically connected to the electrode assembly 2, the other end of the first electrode tab 3 is connected to the first adapter 5, one end of the first feedthrough 7 is connected to the first adapter 5, the other end of the first feedthrough 7 extends from the housing 1, and the first feedthrough 7 is insulated from the housing 1. One end of the second electrode tab 4 is connected to the electrode assembly 2, and the other end of the second electrode tab 4 is connected to the housing 1. The housing 1 and the first feedthrough 7 respectively serve as two electrodes of the electrochemical device 100, for example, the housing 1 is the positive electrode and the first feedthrough 7 is the negative electrode, or alternatively, the housing 1 is the negative electrode and the first feedthrough 7 is the positive electrode.

[0035] Regarding the above-mentioned housing 1, please refer to Figure 3. The housing 1 includes a top plate 11, a bottom plate 12, and a surrounding plate 13. The surrounding plate 13 includes a first side plate 131, a second side plate 132, a third side plate 133, a fourth side plate 134, a fifth side plate 135, and a sixth side plate 136. The first side plate 131, the second side plate 132, the third side plate 133, the fourth side plate 134, the fifth side plate 135, and the sixth side plate 136 are all plate-shaped. One end of the first side plate 131, the second side plate 132, the third side plate 133, the fourth side plate 134, the fifth side plate 135, and the sixth side plate 136 are all disposed on the bottom plate 12, and one end of the first side plate 131, the second side plate 132, the third side plate 133, the fourth side plate 134, the fifth side plate 135, and the sixth side plate 136 are sequentially connected end to end, so that the surrounding plate 13 forms a circumferentially enclosed structure. The first side plate 131 is disposed opposite the fifth side plate 135, the third side plate 133 is disposed opposite the fifth side plate 135, the fourth side plate 134 is disposed opposite the sixth side plate 136, the top plate 11 is disposed at the other end of the enclosure 13, the top plate 11 and the bottom plate 12 are disposed opposite each other, and the bottom plate 12, the top plate 11 and the enclosure 13 collectively enclose a receiving cavity 14. The receiving cavity 14 is used to accommodate the electrode assembly 2, the first electrode tab 3, the second electrode tab 4, the first adapter 5 and the second adapter 6.

[0036] During the assembly process of the electrochemical device 100, the bottom plate 12 and the enclosure 13 are first connected, specifically, the bottom plate 12 is connected to one side of the enclosure 13. After the bottom plate 12 and the enclosure 13 are connected, a mounting shell is formed, and the mounting shell has the above-mentioned receiving cavity 14, and the receiving cavity 14 has an opening. During assembly, first maintain an acute angle or a right angle between the electrode assembly 2 and the mounting shell. After the first pole tab 3 is connected to the first feedthrough 7 and an electrical connection is established, and the second pole tab 4 is electrically connected to the outer shell 1, the electrode assembly 2 is flipped over and loaded into the receiving cavity 14, and then the top plate 11 is closed to seal the above-mentioned opening. Since there is no need to adjust the position of the electrode assembly 2 again during the process of flipping the electrode assembly 2 into the receiving cavity 14, assembly time can be saved and assembly efficiency can be improved.

[0037] In the prior art, during the assembly of the electrochemical device 100, the electrode assembly 2 is typically not flipped and installed into the receiving cavity 14. Therefore, during the installation of the electrode assembly 2 into the receiving cavity 14, movement of the electrode assembly 2 may cause the first tab 3 and the first feedthrough 7, and the second tab 4 and the housing 1 to become loose due to pulling, resulting in unstable electrical connections. In the present application, flipping the electrode assembly 2 into the receiving cavity 14 reduces the probability of unstable tab electrical connections.

[0038] It can be understood that the shape of the shell 1 is not limited to the above structure, as long as the shell 1 encloses the accommodating cavity 14 and the shell 1 has a first side panel 131, for example, the enclosure 13 is connected to the top panel 11 and the bottom panel 12 respectively, and the enclosure 13 only includes the first side panel 131, the second side panel 132, the third side panel 133 and the fourth side panel 134 connected end to end in sequence, and the shell 1 forms a rectangular parallelepiped.

[0039] It should be noted that: the direction Z from the bottom plate 12 to the top plate 11 constitutes the height direction of the electrochemical device 100, the direction Y from the fifth side plate 135 to the first side plate 131 constitutes the width direction of the electrochemical device 100, and the width direction of the electrochemical device 100 is the same as the thickness direction of the first side plate 131, and the direction X from the fourth side plate 134 to the sixth side plate 136 constitutes the length direction of the electrochemical device 100, and the length direction of the electrochemical device 100 is the same as the length direction of the first side plate 131.

[0040] Please refer to Figure 4. After the first electrode tab 3 and the first feedthrough 7 are connected through the first adapter 5, the projection of the first electrode tab 3 and the projection of the first feedthrough 7 do not overlap along the thickness direction of the first side plate 131, so that the first electrode tab 3 and the first feedthrough 7 are staggered. The first electrode tab 3 and the first feedthrough 7 are arranged side by side along the length direction of the first side plate 131, avoiding the first electrode tab 3 and the first feedthrough 7 from being stacked along the thickness direction of the first side plate 131, which is beneficial to shortening the size of the electrochemical device 100 in the width direction, or, when the width direction of the electrochemical device 100 remains unchanged, more space can be left for the electrode assembly 2, which is beneficial to improving the energy density of the electrochemical device 100.

[0041] Regarding the above-mentioned electrode assembly 2, the electrode assembly 2 includes a first electrode sheet 21, a separator (not shown), and a second electrode sheet 22. The first electrode sheet 21, the separator, and the second electrode sheet 22 are stacked in sequence and wound to form a wound battery cell. Alternatively, the electrode assembly 2 includes multiple first electrode sheets 21, multiple separators, and multiple second electrode sheets 22. The first electrode sheets 21 and the second electrode sheets 22 are alternately stacked in sequence, with a separator located between adjacent first electrode sheets 21 and second electrode sheets 22 to form a laminated battery cell.

[0042] Referring to Figure 5 , regarding the first electrode tab 3 and first adapter 5 described above, the first electrode tab 3 includes multiple first connecting portions 31 and first bends 32. The first connecting portion 31 is located on a side close to the electrode assembly 2, and the first bends 32 are located on a side close to the first side plate 131. When the electrode assembly 2 is a wound cell, one coil of the first electrode sheet 21 of the electrode assembly 2 is connected to a first connecting portion 31; when the electrode assembly 2 is a laminated cell, one first electrode sheet 21 of the electrode assembly 2 is connected to a first connecting portion 31. The other ends of all first connecting portions 31 are connected to the first bends 32. The first bending portion 32 is formed with a first bending groove 324, and one end of the first adapter 5 is inserted into the first bending groove 324, and one end of the first adapter 5 is connected to the groove wall of the first bending groove 324. Compared with the method in which one end of the first adapter 5 is connected to the outer surface of the first bending portion 32 facing the first side plate 131, it has the effect of reducing the excessive space occupied by the first adapter 5 in the receiving cavity 14, which is beneficial to shortening the width direction of the electrochemical device 100, or leaving more space for the electrode assembly 2 to improve the energy density of the electrochemical device 100.

[0043] Regarding the first adapter 5, please refer to FIG7 . The distance between the surface of the first adapter 5 proximate to the electrode assembly 2 and the inner surface of the first side plate 131 is B. The inner surface of the first side plate 131 refers to the surface of the first side plate 131 proximate to the electrode assembly 2. B satisfies the following conditions: 0.2 mm ≤ B ≤ 2.2 mm. When the value of B is small, the distance between the surface of the first adapter 5 proximate to the electrode assembly 2 and the inner surface of the first side plate 131 is short, and the combined thickness of the first adapter 5 and the first feedthrough 7 is small, which can make the structure of the electrochemical device 100 more compact and improve the energy density of the electrochemical device 100.

[0044] The above-mentioned B is preferably 0.7 mm. In this case, the superimposed thickness of the first adapter 5 and the first feed-through 7 is small. In this case, the structure of the electrochemical device 100 is more compact and the energy density of the electrochemical device 100 is higher.

[0045] It is understandable that the value of B can also be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm or 2.2 mm.

[0046] The first adapter 5 may be a straight plate-shaped structure, or a bent plate-shaped structure.

[0047] 7 , the distance between the end of the electrode assembly 2 close to the first side plate 131 and the inner surface of the first side plate 131 is A, and A satisfies: 1.4 mm ≤ A ≤ 2.2 mm. This can reduce the space between the electrode assembly 2 and the first side plate 131, making the structure of the electrochemical device 100 more compact and improving the energy density of the electrochemical device 100.

[0048] The above-mentioned A is preferably 1.4 mm. At this time, the distance between the end of the electrode assembly 2 close to the first side plate 131 and the inner surface of the first side plate 131 is shorter. At this time, the structure of the electrochemical device 100 is more compact and the energy density of the electrochemical device 100 is higher.

[0049] It is understandable that the above-mentioned A can also be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm or 2.2 mm.

[0050] The electrode assembly 2 is connected to different layers of the first electrode sheet 21 through multiple first connecting parts 31, so that the current of different layers of the first electrode sheet 21 of the wound battery cell can be transmitted synchronously through different first connecting parts 31, which is beneficial to improving the charging and discharging efficiency of the electrochemical device 100.

[0051] It can be understood that: when the electrode assembly 2 is a wound battery cell, or the electrode assembly 2 is a laminated battery cell, but the laminated battery cell has only one first electrode sheet 21, the number of the first connection part 31 can also be one, and the first connection part 31 is connected to the first electrode sheet 21 to realize the connection between the first connection part 31 and the electrode assembly 2.

[0052] Regarding the above-mentioned first bending portion 32, please continue to refer to Figure 5. The first bending portion 32 includes a first inclined portion 321, a first bent portion 322, and a first straight portion 323. The first inclined portion 321 is arranged near the first connecting portion 31, and the first inclined portion 321 is arranged obliquely relative to the first side plate 131. The other ends of the plurality of first connecting portions 31 are connected to the first inclined portion 321. The first bending portion 322 is located between the first inclined portion 321 and the first straight portion 323. The shape of the first bending portion 322 is roughly n-shaped, and one end of the first bending portion 322 is connected to the first inclined portion 321. The first straight portion 323 is arranged near the first side plate 131, and the first straight portion 323 is roughly parallel to the first side plate 131. One end of the first straight portion 323 is connected to the other end of the first bending portion 322. The surface of the first straight portion 323 facing the first bending groove 324 is part of the groove wall of the first bending groove 324. The surface of the first straight portion 323 facing the first bending groove 324 is connected to one end of the first adapter 5. Since the first straight portion 323 is set straight, the contact area between the first straight portion 323 and the first adapter 5 can be increased, which facilitates welding between the first adapter 5 and the first bending portion 32.

[0053] It should be noted that the first pole ear 3 has multiple first connecting portions 31 and first bending portions 32. The structures of the first inclined portion 321, the first bending portion 322 and the first straight portion 323 can be obtained directly by cutting metal parts, or can be formed by multiple first sub-pole ears (not shown in the figure). Specifically, one end of a first sub-pole ear is connected to a first pole piece 21 or different layers of the first pole piece 21, and the other ends of multiple first sub-pole ears are stacked and bent to form the above-mentioned first bending portion 32.

[0054] Referring to FIG5 , in some embodiments, the electrochemical device 100 further includes a first insulating sheet 8 . The first insulating sheet 8 is disposed between the first straight portion 323 and the first side plate 131 along the thickness direction Y of the first side plate 131 to separate the first straight portion 323 from the first side plate 131 and thereby achieve insulation between the first straight portion 323 and the first side plate 131 . The first insulating sheet 8 is made of an insulating material, such as resin, rubber, etc.

[0055] Regarding the second electrode sheet 22, please refer to FIG6 . The second electrode tab 4 includes a plurality of second connecting portions 41 and a second bent portion 42. The plurality of second connecting portions 41 are disposed near the electrode assembly 2, and the second bent portion 42 is disposed near the first side plate 131. When the electrode assembly 2 is a wound cell, one coil of the second electrode sheet 22 of the electrode assembly 2 is connected to one end of a second connecting portion 41. When the electrode assembly 2 is a laminated cell, one second electrode sheet 22 of the electrode assembly 2 is connected to one end of a second connecting portion 41, and the other ends of all second connecting portions 41 are connected to the second bent portion 42. The second bending portion 42 is formed with a second bending groove 424, one end of the second adapter 6 is inserted into the second bending groove 424, and one end of the second adapter 6 is connected to the inner surface of the second bending portion 42 facing the second bending groove 424, which can reduce the space occupied by the second adapter 6, which is beneficial to shortening the width dimension of the electrochemical device 100, or leaving more space for the electrode assembly 2 to improve the energy density of the electrochemical device 100.

[0056] By connecting multiple second connecting parts 41 to different layers of the second electrode 22, currents in different layers of the second electrode 22 can be synchronously transmitted through different second connecting parts 41, which is beneficial to improving the charging and discharging efficiency of the electrochemical device 100.

[0057] Regarding the above-mentioned second bent portion 42, please refer to Figure 6. The second bent portion 42 includes a second inclined portion 421, a second bent portion 422, and a second straight portion 423. The second inclined portion 421 is arranged near the second connecting portion 41, and is inclined relative to the first side plate 131. The second inclined portion 421 is connected to the other end of the second connecting portion 41. The second bent portion 422 is located between the second inclined portion 421 and the second straight portion 423. The shape of the second bent portion 422 is roughly n-shaped, and one end of the second bent portion 422 is connected to the second inclined portion 421. The second straight portion 423 is arranged near the first side plate 131, and is straight relative to the first side plate 131. One end of the second straight portion 423 is connected to the other end of the second bent portion 422. The second straight portion 423 is connected to the shell 1 to conduct electricity between the second tab 4 and the shell 1.

[0058] Since the second straight portion 423 is arranged straight, when the surface of the second straight portion 423 facing the second bending groove 424 is connected to one end of the second adapter 6, the contact area between the second straight portion 423 and the second adapter 6 can be increased, which is beneficial to the welding of the second adapter 6 and the second straight portion 423 and can improve the connection strength between the second adapter 6 and the second straight portion 423.

[0059] It should be noted that the second pole ear 4 has multiple second connecting parts 41 and second bending parts 42. The structure of the second inclined part 421, the second bending part 422 and the second straight part 423 of the second bending part 42 can be obtained directly by cutting metal parts, or it can be formed by multiple second sub-pole ears (not shown in the figure). Specifically, one end of a second sub-pole ear is connected to a second pole piece 22 or different layers of the second pole piece 22, and the other ends of multiple first sub-pole ears are stacked and bent to form the above-mentioned second bending part 42.

[0060] Regarding the first feedthrough 7, please refer to FIG7 . The first feedthrough 7 includes a first pole 71 and a first insulating sleeve 72. The first side plate 131 is provided with a first mounting hole 1311, and the first insulating sleeve 72 is provided in the first mounting hole 1311. The first pole 71 is sleeved in the first insulating sleeve 72, and the first insulating sleeve 72 insulates the first pole 71 from the housing 1. When the first pole 71 is sleeved in the first insulating sleeve 72, one end of the first pole 71 is located in the receiving cavity 14, one end of the first pole 71 is connected to the second adapter 6, and the other end of the first pole 71 extends out of the housing 1.

[0061] It should be noted that: in some embodiments, the shell 1 may not be directly connected to the second adapter 6. The electrochemical device 100 also includes a second feedthrough (not shown), which passes through the shell 1 and is insulated from the shell 1. One end of the second adapter 6 is electrically connected to the second electrode tab 4, and the other end of the second adapter 6 is electrically connected to the second feedthrough to conduct electricity between the electrode assembly 2 and the second feedthrough.

[0062] Among them, along the thickness direction of the side plate of the shell 1 through which the second feedthrough passes, the projection of the second pole lug 4 on the side plate does not overlap with the projection of the second feedthrough on the side plate, so that the second pole lug 4 and the second feedthrough are staggered, and the second pole lug 4 and the second feedthrough are arranged side by side along the length direction of the side plate, avoiding the second pole lug 4 and the second feedthrough from being stacked in the thickness direction of the side plate, which is beneficial to shortening the size of the electrochemical device 100 in the width direction, or, when the width direction of the electrochemical device 100 remains unchanged, more space can be left for the electrode assembly 2, which is beneficial to improving the energy density of the electrochemical device 100.

[0063] Among them, the second feed-through and the first feed-through 7 can be arranged on the same side of the shell 1, and the side panel of the shell 1 through which the second feed-through passes is the first side panel 131 or the third side panel 133; alternatively, the second feed-through and the first feed-through 7 can be arranged on different sides of the shell 1, and the side panel of the shell 1 through which the second feed-through passes is the fifth side panel 135; of course, the second feed-through can also be arranged on other side panels of the shell 1, for example: the second feed-through is arranged on the fourth side panel 134, the sixth side panel 136, and so on.

[0064] The second feedthrough includes a second pole (not shown) and a second insulating sleeve (not shown). The housing 1 is provided with a second mounting hole (not shown), the second insulating sleeve is disposed in the second mounting hole, and the second pole is sleeved in the second insulating sleeve. One end of the second pole is located in the receiving cavity 14, one end of the second pole is connected to the second pole lug 4, and the other end of the second pole extends from the second insulating sleeve outside the housing 1. The second insulating sleeve separates the second pole from the housing 1 to prevent the second pole and the housing 1 from contacting and causing a short circuit.

[0065] In some embodiments, the electrochemical device 100 further includes a second insulating sheet (not shown), which is disposed between the housing 1 and the second straight portion 423 to insulate the housing 1 from the second straight portion 423 .

[0066] In order to facilitate readers to understand the inventive concept of the present invention, the assembly process of the electrochemical device 100 is described below: Before installation, the bottom plate 12 and the surrounding plate 13 of the outer shell 1 are in a connected state to form an installation shell, and the installation shell has the above-mentioned receiving cavity 14. Since the top plate 11 has not yet been connected to the surrounding plate 13, the receiving cavity 14 has an opening at this time. The first bending groove 324 is arranged closer to the opening relative to the bottom plate 12, so that when the electrode assembly 2 is loaded into the receiving cavity 14, it can be flipped around the first bending groove and loaded into the receiving cavity 14. The electrode assembly 2 can be loaded into the receiving cavity 14 more quickly. Please refer to Figure 8. First, the electrode assembly 2 is placed flat, and the outer shell 1 is set upright at the same time, so that the outer shell 1 and the electrode assembly 2 are perpendicular to each other or have an acute angle. The ends of the first adapter 5 are then welded to the first straight portion 323 of the first electrode tab 3 and the first electrode column 71, respectively. The ends of the second adapter 6 are then welded to the second straight portion 423 of the second electrode tab 4 and the housing 1, respectively. The electrode assembly 2 is then flipped over and loaded into the receiving cavity 14. Finally, the top plate 11 is closed and connected to the enclosure 13 to seal the opening of the receiving cavity 14. During the process of flipping the electrode assembly 2 into the receiving cavity 14, the first electrode tab 3 is bent to form the first connecting portion 31 and the first bent portion 32. Simultaneously, the second electrode tab 4 is bent to form the second connecting portion 41 and the second bent portion 42.

[0067] In an embodiment of the present invention, the electrode assembly 2 is accommodated in the outer shell 1, and the first feedthrough 7 is provided in the first side plate 131 of the outer shell 1, one end of the first pole tab 3 is connected to the electrode assembly 2, and the other end of the first pole tab 3 is connected to one end of the first adapter 5, and the other end of the first adapter 5 is connected to the first feedthrough 7. Along the thickness direction of the first side plate 131, the projection of the first pole tab 3 on the first side plate 131 and the projection of the first feedthrough 7 on the first side plate 131 do not overlap, so that the first pole tab 3 and the first feedthrough 7 are staggered, avoiding the first pole tab 3 and the first feedthrough 7 from stacking along the thickness direction of the first side plate 131, which is beneficial to shortening the size of the electrochemical device 100 in the width direction, or, when the width direction of the electrochemical device 100 remains unchanged, more space can be reserved for the electrode assembly 2, which is beneficial to improving the energy density of the electrochemical device 100.

[0068] Referring to Figure 2 , in one specific embodiment, the cell head width of an electrochemical device 100 is W mm, the cell thickness is T mm, and the length of the cell head is L mm. Compared to conventional electrochemical devices, L is shortened by 0.65 mm. Therefore, the energy density gain of the electrochemical device 100 of the present invention is: 0.65 × W × T / (W × T × L) × 100%, or 0.65 / L × 100%.

[0069] The present application also provides an electrical device comprising the electrochemical device 100. The structure and function of the electrochemical device 100 can be found in the above embodiments and will not be described in detail here. The electrical device may be a mobile phone, tablet computer, drone, energy storage product, one-wheeled or two-wheeled electric vehicle, or a power tool.

[0070] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended to be additional limitations on the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, the above-mentioned technical features can be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of the present invention. Furthermore, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An electrochemical device comprising: A shell, a first feedthrough, an electrode assembly and a first pole ear, wherein the shell is provided with a receiving cavity, the electrode assembly is received in the receiving cavity, the shell comprises a first side plate, the first feedthrough is passed through the first side plate, the first feedthrough is insulated from the first side plate, the first pole ear is connected to the electrode assembly, and is characterized in that: The electrochemical device also includes a first adapter, which is accommodated in the accommodating cavity, and the first pole ear includes a first connecting portion and a first bending portion, one end of the first connecting portion is connected to the electrode assembly, and the other end of the first connecting portion is connected to the first bending portion, one end of the first adapter is electrically connected to the first bending portion, and the other end of the first adapter is electrically connected to the first feedthrough, and along the thickness direction of the first side plate, the projection of the first pole ear does not overlap with the projection of the first feedthrough.

2. The electrochemical device according to claim 1, characterized in that The first bending portion is formed with a first bending groove, and one end of the first adapter is inserted into the first bending groove and connected to a groove wall of the first bending groove.

3. The electrochemical device according to claim 2, characterized in that The first bending portion includes a first inclined portion, a first bent portion and a first straight portion, the first inclined portion is connected to the other end of the first connecting portion, the two ends of the first bending portion are respectively connected to the first inclined portion and the first straight portion, the first inclined portion, the first bent portion and the first straight portion jointly enclose the first bending groove, and the surface of the first straight portion facing the first bending groove is connected to one end of the first adapter.

4. The electrochemical device according to claim 3, characterized in that The electrochemical device further includes a first insulating sheet; The first insulating sheet is disposed between the first straight portion and the first side plate along a thickness direction of the first side plate, and the first insulating sheet is used to insulate the first straight portion from the first side plate.

5. The electrochemical device according to claim 1, characterized in that A is a distance between a surface of the first side plate close to the electrode assembly and an end of the electrode assembly close to the first side plate, and A satisfies: 1.4 mm ≤ A ≤ 2.2 mm.

6. The electrochemical device according to claim 1, characterized in that A distance between a surface of the first side plate close to the electrode assembly and a surface of the first adapter close to the electrode assembly is B, and B satisfies: 0.2 mm ≤ B ≤ 2.2 mm.

7. The electrochemical device according to claim 1, characterized in that There are multiple first connection parts, one end of each of the multiple first connection parts is connected to the electrode assembly, and the other end of each of the multiple first connection parts is connected to the first bending part.

8. The electrochemical device according to claim 7, characterized in that The electrode assembly includes a first pole piece, a diaphragm, and a second pole piece. The first pole piece, the diaphragm, and the second pole piece are stacked and wound. A coil layer of the first pole piece is connected to the first connecting portion.

9. The electrochemical device according to claim 8, characterized in that The electrode assembly includes a first electrode plate, a diaphragm and a second electrode plate. The first electrode plate, the diaphragm and the second electrode plate are all in plurality. The first electrode plates and the second electrode plates are alternately stacked in sequence. The diaphragm is located between adjacent first electrode plates and second electrode plates. The first electrode plate is connected to the first connecting portion.

10. The electrochemical device according to any one of claims 1 to 9, characterized in that: The first feed-through includes a first pole and a first insulating sleeve, the first side plate is provided with a first mounting hole, the first insulating sleeve is arranged in the first mounting hole, one end of the first pole is located in the accommodating cavity, one end of the first pole is connected to the first pole ear, and the other end of the first pole passes through the first insulating sleeve and extends out of the outer shell.

11. The electrochemical device according to any one of claims 1 to 9, characterized in that: The electrode assembly further includes a second electrode tab, one end of which is connected to the electrode assembly, and the other end of which is electrically connected to the housing.

12. The electrochemical device according to any one of claims 1 to 9, characterized in that: The electrode assembly further includes a second pole ear and a second feedthrough, wherein the second feedthrough is provided through the shell, the second feedthrough is insulated from the shell, one end of the second pole ear is electrically connected to the electrode assembly, and the other end of the second pole ear is electrically connected to the second feedthrough connect.

13. The electrochemical device according to any one of claims 1 to 9, characterized in that: The outer shell includes a base plate and a surrounding plate, the surrounding plate is circumferentially enclosed, the base plate is connected to one side of the surrounding plate to form a mounting shell, the mounting shell has the receiving cavity, and the receiving cavity is provided with an opening, and the first bending groove is arranged closer to the opening relative to the base plate.

14. The electrochemical device according to any one of claims 13, characterized in that: The housing further includes a top plate connected to the other side of the enclosure to seal the opening.

15. An electrical equipment, characterized in that: Comprising the electrochemical device according to any one of claims 1 to 14.

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