Electrochemical devices and electronic devices

Abstract

The present application relates to an electrochemical device and an electronic device, comprising a shell enclosing a receiving cavity, an electrode assembly received in the receiving cavity, and a pole insulated and connected to the shell. The electrode assembly is provided with a first pole ear and a second pole ear, and along the extension direction of the first pole ear and the second pole ear, the outer surface of the shell is convexly provided with a first extension portion and a second extension portion arranged at intervals. The first extension portion defines a first cavity connected to the receiving cavity, and the first pole ear extends into the first cavity. The second extension portion defines a second cavity connected to the receiving cavity, and the second pole ear extends into the second cavity. The pole includes a first part and a second part connected to each other, the first part is electrically connected to the first pole ear in the first cavity, and the second part is exposed from the first extension portion. The first pole ear and the second pole ear do not occupy additional receiving cavity space, which can fully improve the energy density of the electrochemical device.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electrochemical devices, and in particular to an electrochemical device and an electronic device. Background Art

[0002] With the advancement of science and technology and the advent of the wave of intelligence, miniaturized electronic devices are becoming more and more popular among people, such as smart glasses, temperature patches, smart wrists, etc. As electronic devices become smaller and smaller, the compression space is almost limited, which puts higher requirements on the thickness and size of batteries (electrochemical devices). In addition, in the future, electronic devices will have the need for battery replacement development, that is, to complete the battery replacement without powering off the electronic device, which means that an additional small battery needs to be installed inside the electronic device.

[0003] Given the limited internal space of electronic devices, ultra-thin batteries can act as small power sources in electronic devices to supply the electrical energy required by electronic devices during the battery replacement process. Currently on the market, ultra-thin batteries usually use soft-pack batteries, which have a difficult corner folding process and high manufacturing costs. Therefore, hard-shell batteries can be used to solve the problem of package corner folding, but the bare cells of hard-shell batteries usually need to lead out the positive and negative electrodes through the pole ears, which will take up a large space in the shell of the hard-shell battery, which will result in low energy density of the hard-shell battery. Summary of the invention

[0004] The present application aims to provide an electrochemical device and an electronic device to improve the energy density of the electrochemical device.

[0005] In a first aspect of the present application, an electrochemical device is provided, comprising a shell enclosing a receiving cavity, an electrode assembly received in the receiving cavity, and a pole insulated and connected to the shell. The electrode assembly is provided with a first pole ear and a second pole ear, the first pole ear and the second pole ear extending from the same end of the electrode assembly, and along the direction in which the first pole ear and the second pole ear extend, the outer surface of the shell is provided with a first extension portion and a second extension portion arranged at intervals. The first extension portion defines a first cavity connected to the receiving cavity, and the first pole ear extends into the first cavity. The second extension portion defines a second cavity connected to the receiving cavity, and the second pole ear extends into the second cavity. The pole includes a first part and a second part connected to each other, the first part is electrically connected to the first pole ear in the first cavity, and the second part is exposed from the first extension portion.

[0006] In the above technical solution, the first extension part and the second extension part are arranged at intervals, the first pole ear extends into the first extension part, and the second pole ear extends into the second extension part, so that the first pole ear and the second pole ear do not occupy additional accommodating cavity space, which can fully improve the energy density of the electrochemical device. At the same time, when the electrochemical device of this structure is installed on an electronic device, the space that the electronic device avoids the electrochemical device can be minimized, further improving the competitiveness of the electrochemical device.

[0007] In some embodiments, the first extension portion is provided with a through hole communicating with the first cavity, the first portion covers the through hole, one end of the second portion is connected to the wall of the first portion facing the through hole, and the second portion is at least partially located in the through hole. By covering the through hole with the first portion, the first cavity can be sealed to prevent external impurities from entering the first cavity; at the same time, the second portion is arranged in the through hole to facilitate electrical connection to an external circuit.

[0008] In some embodiments, the electrochemical device further comprises an insulating member, which is disposed between the first portion and the first extension portion to insulate and separate the first extension portion from the first portion. The first portion is directly connected to the inner wall of the first extension portion through the insulating member, eliminating the connection structure such as the connecting sheet, thereby reducing the cost and improving the stability of the connection between the pole and the first extension portion.

[0009] In some embodiments, the first pole ear is bent in a direction parallel to the first portion, and the first pole ear is attached to the end surface of the first portion facing away from the second portion. By arranging the first pole ear in parallel with the first portion, when the first pole ear is connected to the first portion, the connection area between the first pole ear and the first portion can be increased to improve the stability of the connection between the first pole ear and the first portion.

[0010] In some embodiments, the electrochemical device further comprises a mounting circuit board, which is disposed between the first extension portion and the second extension portion, and is electrically connected to the first pole tab and the second pole tab. A logic circuit is disposed in the mounting circuit board, and after the positive and negative poles of the electrochemical device are connected, the electrochemical device can be logically controlled. At the same time, the mounting circuit board is disposed in the gap space between the first extension portion and the second extension portion, which can fully improve the space utilization rate of the electrochemical device.

[0011] In some embodiments, the electrochemical device further includes a first adapter and a second adapter. One end of the first adapter is disposed in the first cavity and electrically connected to the first pole ear, and the other end extends outside the first extension portion and electrically connected to the mounting circuit board. One end of the second adapter is disposed in the second cavity and electrically connected to the second pole ear, and the other end extends outside the second extension portion and electrically connected to the mounting circuit board. By providing the first adapter and the second adapter, the positive and negative electrodes of the electrochemical device can be further led out to facilitate electrical connection with the mounting circuit board.

[0012] In some embodiments, the housing has a connecting wall facing away from the accommodating cavity, and the connecting wall is disposed between the first extension portion and the second extension portion. The housing further includes a first chamfered portion and a second chamfered portion, the first chamfered portion being disposed on a side of the first extension portion facing the second extension portion, the first chamfered portion being in an arc shape recessed toward the accommodating cavity, and the first chamfered portion being connected to the first extension portion and the connecting wall. The second chamfered portion is disposed on a side of the second extension portion facing the first extension portion, the second chamfered portion being in an arc shape recessed toward the accommodating cavity, and the second chamfered portion being connected to the second extension portion and the connecting wall. By providing two chamfered portions, the first extension portion and the second extension portion are smoothly connected to the connecting wall, and when installing the circuit board, the scratches of the installed circuit board by the two extension portions can be reduced.

[0013] In some embodiments, on the side of the first and second pole tabs away from the electrode assembly, the shell has a first side wall, and the first extension and the second extension are both extended from the first side wall in the direction away from the electrode assembly. Along the first direction, the electrochemical device also includes a second side wall and a third side wall arranged oppositely, and the first side wall is connected between the second side wall and the third side wall. The first direction is the thickness direction of the electrode assembly. The first extension has a second sub-side wall, the through hole is opened in the second sub-side wall, the second sub-side wall is flush with the second side wall, or the second sub-side wall is extended from the second side wall. Along the second direction, the electrochemical device also includes a fourth side wall and a fifth side wall arranged oppositely, the fourth side wall is connected to the second side wall and the third side wall, and the fifth side wall is connected to the second side wall and the third side wall. The first extension includes a fourth sub-side wall away from the second extension, the fourth sub-side wall is connected to the fourth side wall and is flush with the fourth side wall, or the fourth sub-side wall is extended from the fourth side wall. The second extension portion includes a fifth sub-side wall away from the first extension portion, the fifth sub-side wall is connected to the fifth side wall and is flush with the fifth side wall, or the fifth sub-side wall is extended from the fifth side wall. The first extension portion, the second extension portion and the side walls of the shell are flush, making full use of the space of the electrochemical device.

[0014] In some embodiments, the thickness of the electrochemical device along the direction from the third side wall to the second side wall is L, and L≤1.5 mm, so as to meet the ultra-thin design of the electrochemical device.

[0015] In some embodiments, the protruding height of the first extension portion along the direction from the electrode assembly to the first side wall is H1, satisfying 1.1 mm≤H1<1.5 mm; so that the first extension portion can accommodate the first electrode tab while ensuring that the electrochemical device has a smaller length dimension.

[0016] In some embodiments, the protruding height of the second extension portion along the direction from the electrode assembly to the first side wall is H2, satisfying 1.1 mm≤H2<1.5 mm; so that the second extension portion can accommodate the second electrode tab while ensuring that the electrochemical device has a smaller length dimension.

[0017] In some embodiments, the first side wall includes a first surface facing the accommodating cavity and a second surface away from the accommodating cavity. Along the direction from the first surface to the second surface, the thickness of the first side wall is D, satisfying 0.05mm≤D≤0.2mm, so as to ensure that the first side wall has better punching strength.

[0018] In a second aspect, an embodiment of the present application further proposes an electronic device, comprising an electrochemical device as described in any embodiment of the first aspect above.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 also be obtained based on the drawings.

[0021] Figure 1 A schematic diagram of the structure of an electrochemical device according to some embodiments of the present application;

[0022] Figure 2 An exploded view of an electrochemical device according to some embodiments of the present application;

[0023] Figure 3 An exploded view of a housing according to some embodiments of the present application;

[0024] Figure 4 This is a schematic diagram of the installation of the electrode assembly and the housing in some embodiments of the present application;

[0025] Figure 5 A full cross-sectional view of a first side wall of some embodiments of the present application;

[0026] Figure 6 A schematic diagram of the structure of an electrochemical device according to some embodiments of the present application;

[0027] Figure 6a A schematic diagram of the structure of an electrochemical device according to some embodiments of the present application;

[0028] Figure 7 Schematic diagram of the structure of the electrochemical device of some embodiments of the present application (the dotted line portion is the internal structure);

[0029] Figure 8 This is a schematic diagram of assembling a housing and a mounting circuit board in some embodiments of the present application;

[0030] Fig. 9 This is a schematic diagram of assembling a housing and a mounting circuit board in some embodiments of the present application;

[0031] Fig.10 A schematic diagram of the installation of poles in some embodiments of the present application;

[0032] Fig.11 Schematic diagram of the structure of an electrochemical device according to some embodiments of the present application.

[0033] 100. Electrochemical device;

[0034] 10. Shell; 10a. Accommodating cavity; 11. First side wall; 111. Connecting wall; 112. First chamfered portion; 113. Second chamfered portion; 12. Second side wall; 13. Third side wall; 14. Fourth side wall; 15. Fifth side wall; 16. Sixth side wall; 17. First extension portion; 171. First cavity; 172. Through hole; 173. Second sub-side wall; 174. Fourth sub-side wall; 18. Second extension portion; 181. Second cavity; 182. Fifth sub-side wall;

[0035] 20. electrode assembly; 21. first pole ear; 22. second pole ear;

[0036] 30. Pole; 31. First part; 32. Second part;

[0037] 40. Install the circuit board; 41. Fillet;

[0038] 50. A first adapter;

[0039] 60. Second adapter;

[0040] 70. Insulating parts. DETAILED DESCRIPTION

[0041] 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. In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.

[0042] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0043] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. In addition, the technical features involved in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

[0044] 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 are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] In the first aspect, the embodiment of the present application provides an electrochemical device 100, please refer to Figure 1 and Figure 2 The electrochemical device 100 includes a housing 10, an electrode assembly 20 and a pole 30. It should be noted that in the embodiment of the present application, the electrochemical device 100 is the smallest unit constituting a battery or a battery module, and is a place for realizing the conversion of electrical energy and chemical energy.

[0046] For the above-mentioned housing 10, please refer to Figure 1 and Figure 2 The housing 10 encloses a receiving cavity 10a, which can contain an electrolyte (not shown in the figure) and the electrode assembly 20. The housing 10 can be formed by punching a metal sheet, and the thickness of the metal sheet can be set to 0.05 mm to 0.2 mm. It can be understood that for an electrochemical device 100 with a fixed outer size, the smaller the thickness of the metal sheet, the higher the energy density of the electrochemical device 100.

[0047] Taking the electrochemical device 100 with an outer dimension of 1.4mm (thickness) * 96mm (width) * 101mm (length) as an example, the wall thickness of the shell 10 of 0.3mm (that is, the thickness of the above-mentioned metal sheet) is used as a reference; when the wall thickness of the shell 10 is set to 0.2mm, the energy density of the electrochemical device 100 is increased by 0.11%; when the wall thickness of the shell 10 is set to 0.1mm, the energy density is increased by 0.21%; when the wall thickness of the shell 10 is set to 0.05mm, the energy density is increased by 1%. In order to ensure the punching strength of the shell 10, the thickness of the metal sheet is usually not less than 0.05mm. In this embodiment, the wall thickness of the shell 10 of 0.05mm to 0.2mm is used, which can improve the energy density of the electrochemical device 100 while meeting the ultra-thin design requirements of the electrochemical device 100, and can ensure the better punching strength of the shell 10, wherein the material of the shell 10 can be a conductive metal material such as aluminum, steel, stainless steel, nickel, copper or magnesium alloy.

[0048] Optional, please refer to Figure 1 and Figure 3 The shell 10 includes a first side wall 11, a second side wall 12, a third side wall 13, a fourth side wall 14, a fifth side wall 15 and a sixth side wall 16. The sixth side wall 16 is arranged opposite to the first side wall 11 along the third direction Y, the second side wall 12 and the third side wall 13 are arranged opposite to each other along the first direction Z, and the fourth side wall 14 and the fifth side wall 15 are arranged opposite to each other along the second direction X. The six side walls together enclose the above-mentioned shell 10. The thickness of the shell 10 can be set to L, satisfying L≤3mm, so as to meet the ultra-thin design of the electrochemical device 100. The first direction Z, the second direction X and the third direction Y are perpendicular to each other.

[0049] For the electrode assembly 20, please refer to Figure 1 and Figure 2 The electrode assembly 20 is accommodated in the above-mentioned accommodation cavity 10a. The electrode assembly 20 includes a separator (not shown in the figure) and a first pole piece (not shown in the figure) and a second pole piece (not shown in the figure) with opposite polarities. The separator is arranged between the first pole piece and the second pole piece to separate the two. The electrode assembly 20 can be formed by stacking the first pole piece and the second pole piece, or by stacking and winding the first pole piece and the second pole piece.

[0050] Please refer to Figure 2 and Figure 4The first pole piece is connected to a first pole ear 21, and the first pole ear 21 can lead out the polarity of the first pole piece; the second pole piece is connected to a second pole ear 22, and the second pole ear 22 can lead out the polarity of the second pole piece; for example, if the first pole piece is a negative pole piece and the second pole ear 22 is a positive pole piece, the first pole ear 21 leads out the negative pole and the second pole ear 22 leads out the positive pole. The first pole ear 21 and the second pole ear 22 both extend from the same end of the electrode assembly 20, for example, both extend along the electrode assembly 20 toward the first side wall 11. To prevent the first pole ear 21 and the second pole ear 22 from short-circuiting due to contact, the first pole ear 21 and the second pole ear 22 are spaced apart from each other.

[0051] Please refer to Figure 2 and Figure 4 , along the direction from the electrode assembly 20 to the first pole ear 21 and the second pole ear 22 (third direction Y), the outer surface of the shell 10 is protruded with a first extension portion 17 and a second extension portion 18. For example, the first extension portion 17 and the second extension portion 18 are both extended from the first side wall 11 in the direction away from the electrode assembly 20. The first extension portion 17 defines a first cavity 171, and the first pole ear 21 extends from the accommodating cavity 10a into the first cavity 171. The second extension portion 18 defines a second cavity 181, and the second pole ear 22 extends from the accommodating cavity 10a into the second cavity 181. The first extension portion 17 and the second extension portion 18 are arranged at intervals, which makes the first pole ear 21 and the second pole ear 22 do not occupy additional space in the accommodating cavity 10a, thereby improving the energy density of the electrochemical device 100. Among them, the first extension portion 17 and the second extension portion 18 can both be obtained by punching out the first side wall 11. In order to ensure the punching strength of the first side wall 11, such as Figure 5 As shown, the thickness of the first side wall 11 can be set to D, satisfying 0.05 mm ≤ D ≤ 0.2 mm.

[0052] In some embodiments, please refer to Figure 6 and Figure 7 , the electrochemical device 100 also includes a mounting circuit board 40, which is disposed between the first extension portion 17 and the second extension portion 18, and the mounting circuit board 40 is electrically connected to the first pole ear 21 and the second pole ear 22. A logic circuit is disposed in the mounting circuit board 40, and after the positive and negative pole ears (the first pole ear 21 and the second pole ear 22) of the electrochemical device 100 are connected, the electrochemical device 100 can be logically controlled. For example, when the electrochemical device 100 in this embodiment acts as a small power source and is installed in an electronic device, during the power replacement process of the electronic device, the electrochemical device 100 is controlled by the mounting circuit board 40 to supply power to the electronic device. By disposing the mounting circuit board 40 in the gap space between the first extension portion 17 and the second extension portion 18, the space utilization rate of the electrochemical device 100 can be fully improved.

[0053] Optional, see Figure 7 and Figure 8 , along the protruding direction of the first extension portion 17 and the second extension portion 18 (third direction Y), the width of the mounting circuit board 40 can be set to be less than or equal to the extension length of the first extension portion 17 and less than or equal to the extension length of the second extension portion 18. For example, along the direction from the electrode assembly 20 to the first pole tab 21 and the second pole tab 12 (third direction Y), the protruding height of the first extension portion 17 is H1, which satisfies 1.1mm≤H1<1.5mm, the protruding height of the second extension portion 18 is H2, which satisfies 1.1mm≤H2<1.5mm, and the width of the mounting circuit board 40 is H3, which satisfies H3≤H1, H3≤H2. This makes the mounting circuit board 40 not occupy additional space in the length direction of the electrochemical device 100 (third direction Y), so as to meet the miniaturized design of the electrochemical device 100.

[0054] For another example, please refer to Figure 6 and Figure 7 The width of the mounting circuit board 40 can be set to be the same as the protruding height of the first extension portion 17 and the second extension portion 18 (the same within a preset error range, for example, within 0.1 mm). When the mounting circuit board 40 is installed in the space between the first extension portion 17 and the second extension portion 18, at the end away from the electrode assembly 20, the first extension portion 17, the second extension portion 18 and the mounting circuit board 40 are flush, which makes the electrochemical device 100 after the mounting circuit board 40 is connected to an approximately square structure. This design can not only fully improve the space utilization rate of the electrochemical device 100, but also facilitate the installation of the electrochemical device 100 on electronic equipment.

[0055] In some other embodiments, the width of the mounting circuit board 40 and the protruding height of the first extension portion 17 and the second extension portion 18 can be adaptively adjusted according to specific installation requirements. For example, the mounting position on the electronic device is relatively large. In order to facilitate the electrochemical device 100 to be adapted and installed on the mounting position of the electronic device, please refer to Figure 6a The width of the mounting circuit board 40 can also be set to be greater than the protruding height of the first extension portion 17 and the second extension portion 18. The matching of the mounting circuit board 40 and the two extension portions is actually various, and the embodiments of the present application are not limited thereto.

[0056] In some embodiments, please refer to Fig. 9 The housing 10 has a connecting wall 111 away from the accommodating cavity 10a, and the connecting wall 111 is arranged between the first extension portion 17 and the second extension portion 18. It can be understood that the connecting wall 111 is also the first side wall 11 (refer to Figure 3) on the surface away from the accommodating cavity 10a, wherein the mounting circuit board 40 is attached to the connecting wall 111. The housing 10 further includes a first chamfered portion 112 and a second chamfered portion 113. The first chamfered portion 112 is disposed on the side of the first extension portion 17 facing the second extension portion 18. The first chamfered portion 112 is in an arc shape that is recessed toward the accommodating cavity 10a. The first chamfered portion 112 is smoothly connected to the first extension portion 17 and the connecting wall 111. The second chamfered portion 113 is disposed on the side of the second extension portion 18 facing the first extension portion 17. The second chamfered portion 113 is in an arc shape that is recessed toward the accommodating cavity 10a. The second chamfered portion 113 is connected to the second extension portion 18 and the connecting wall 111. By providing two chamfered portions (the first chamfered portion 112 and the second chamfered portion 113), the first extension portion 17 and the second extension portion 18 are smoothly connected to the connecting wall surface 111, and when installing the mounting circuit board 40, the two extension portions (the first extension portion 17 and the second extension portion 18) can reduce scratches on the mounting circuit board 40. The radius of the first chamfered portion 112 and the second chamfered portion 113 can be set to 0.1 mm to 0.3 mm.

[0057] Optionally, two rounded corners 41 may also be provided on the surface of the mounting circuit board 40 facing the connecting wall 111, and the two rounded corners 41 are respectively provided at the left and right ends of the surface. When the mounting circuit board 40 is installed in the gap space between the first extension portion 17 and the second extension portion 18, the two rounded corners 41 are in smooth contact with the two chamfered portions respectively, which not only facilitates the positioning and installation of the mounting circuit board 40, but also reduces mutual scratches between the mounting circuit board 40 and the two extension portions.

[0058] In some other embodiments, please refer to Figure 2 and Figure 7 The electrochemical device 100 further includes a first adapter 50 and a second adapter 60. One end of the first adapter 50 is disposed in the first cavity 171 and is electrically connected to the first pole ear 21, and the other end extends outside the first extension portion 17 and is electrically connected to the mounting circuit board 40. One end of the second adapter 60 is disposed in the second cavity 181 and is electrically connected to the second pole ear 22, and the other end extends outside the second extension portion 18 and is electrically connected to the mounting circuit board 40. Both the first adapter 50 and the second adapter 60 can be made of nickel sheets for welding with the pole ears and the mounting circuit board 40. By providing the first adapter 50 and the second adapter 60, the positive and negative electrodes of the electrochemical device 100 can be further led out to facilitate electrical connection with the mounting circuit board 40.

[0059] For the above-mentioned pole 30, please refer to Figure 1 and Figure 2 The electrode 30 is configured to lead out one polarity (positive electrode or negative electrode) of the electrochemical device 100. Fig.10The pole 30 includes a first portion 31 and a second portion 32 connected to each other. The first portion 31 is disposed in the first cavity 171 of the first extension portion 17, and the first portion 31 is electrically connected to the first pole tab 21. The second portion 32 extends from the first cavity 171 to the outside of the first extension portion 17 to lead out the polarity of the first pole tab 21. For example, the first extension portion 17 is provided with a through hole 172 connected to the first cavity 171, and the second portion 32 extends to the through hole 172, so that the second portion 32 can be directly connected to an external circuit to conduct the electrochemical device 100.

[0060] In the embodiment of the present application, since the housing 10 is made of a conductive metal material, the second pole tab 22 can be directly electrically connected to the housing 10, so that the housing 10 can directly lead out the other polarity of the electrochemical device 100. For example, the first pole tab 21 is a negative pole tab, and the second pole tab 22 is a positive pole tab, that is, the pole 30 leads out the negative pole of the electrochemical device 100, and the housing 10 is the positive pole of the electrochemical device 100; in some other embodiments, the housing 10 can also be used as a negative pole, and the pole 30 leads out the positive pole of the electrochemical device 100. The second extension portion 18 is protruded from the housing 10, and the second extension portion 18 is also a part of the housing 10, so the second pole tab 22 can also be directly connected to the second extension portion 18, and the second extension portion 18 leads out the polarity of the second pole tab 22.

[0061] In some embodiments, the first portion 31 covers the through hole 172, one end of the second portion 32 is connected to the wall of the first portion 31 facing the through hole 172, and the other end of the second portion 32 is disposed in the through hole 172. By covering the through hole 172 with the first portion 31, the first cavity 171 can be sealed to prevent external impurities from entering the first cavity 171.

[0062] Since the pole 30 and the housing 10 have different polarities, the pole 30 and the housing 10 need to be separated and insulated. Fig.10 The electrochemical device 100 further includes an insulating member 70, which is connected between the first extension portion 17 and the first part 31, and is used to insulate and separate the first extension portion 17 and the first part 31. There is a gap space between the second part 32 and the inner wall of the through hole 172, so that the entire pole 30 is separated and insulated from the shell 10. In this embodiment, the insulating member 70 has adhesiveness, and the first part 31 is directly bonded to the inner wall of the first extension portion 17 through the insulating member 70, eliminating the connection structure such as the connecting sheet, which can reduce the cost while improving the stability of the connection between the pole 30 and the first extension portion 17.

[0063] In some other embodiments, please continue to refer to Fig.10The first pole tab 21 is bent in a direction parallel to the first portion 31, and the first pole tab 21 is attached to the end surface of the first portion 31 that is away from the second portion 32. By arranging the first pole tab 21 and the first portion 31 in parallel, when the first pole tab 21 and the first portion 31 are connected, the connection area between the first pole tab 21 and the first portion 31 can be increased, so as to improve the stability of the connection between the first pole tab 21 and the first portion 31.

[0064] In some embodiments, please refer to Fig.11 The first extension portion 17 has a second sub-side wall 173, and the through hole 172 is opened on the second sub-side wall 173 of the first extension portion 17, so that the pole 30 does not occupy the space in the length direction (third direction Y) of the electrochemical device 100, and, as Fig.10 As shown, the first electrode tab 21 is usually in sheet shape, and occupies a small space in the thickness direction (first direction Z) of the electrochemical device 100 . The electrode column 30 extends from the through hole 172 in the thickness direction (first direction Z) of the electrochemical device 100 , which can fully improve the space utilization rate of the electrochemical device 100 .

[0065] Among them, the second sub-side wall 173 is flush with the second side wall 12, or the second sub-side wall 173 is extended from the second side wall 12; the first extension portion 17 includes a fourth sub-side wall 174 away from the second extension portion 18, the fourth sub-side wall 174 is connected to the fourth side wall 14 and flush with the fourth side wall 14, or the fourth sub-side wall 174 is extended from the fourth side wall 14; the second extension portion 18 includes a fifth sub-side wall 182 away from the first extension portion 17, the fifth sub-side wall 182 is connected to the fifth side wall 15 and flush with the fifth side wall 15, or the fifth sub-side wall 182 is extended from the fifth side wall 15. The first extension portion 17, the second extension portion 18 and the side walls of the housing 10 are flush, making full use of the space of the electrochemical device 100.

[0066] The electrochemical device 100 of the present application takes a steel-shell lithium-ion battery as an example. Compared with a soft-pack battery, its energy density is improved as follows:

[0067] Among them, the size of the steel shell battery is 1.5mm (thickness) * 45mm (width) * 95mm (length), the size of the cathode electrode is 93.09mm * 43.14mm, and the cathode area is 4015.9mm 2 , the volume of steel shell battery is 6412.5mm 3 , VED (volume energy density) is proportional to 0.6262;

[0068] The dimensions of the soft pack battery are: 1.5mm (thickness) * 45mm (width) * 95mm (length), the cathode plate dimensions are 83.87mm * 42.042mm, and the cathode area is 3526.06mm2 , the volume of soft pack battery is 6412.5mm 3 , the VED ratio of soft-pack batteries is 0.5498.

[0069] ED (energy density) improvement: 0.6262 / 0.5498=113.8%; it can be seen that compared with the soft-pack battery, the energy density of the steel-shell battery in the embodiment of the present application is improved by about 13.8%.

[0070] In the embodiment of the present application, the first extension portion 17 and the second extension portion 18 are arranged at intervals, the first pole ear 21 extends in the first extension portion 17, and the second pole ear 22 extends in the second extension portion 18, so that the first pole ear 21 and the second pole ear 22 do not occupy the additional space of the accommodating cavity 10a, and the energy density of the electrochemical device 100 can be fully improved. At the same time, when the electrochemical device 100 of this structure is installed on an electronic device, the space for the electronic device to avoid the electrochemical device 100 can be minimized, further improving the competitiveness of the electrochemical device 100. In addition, the gap space between the first extension portion 17 and the second extension portion 18 can be provided with a mounting circuit board 40 to perform logic control on the electrochemical device 100, and the space of the electrochemical device 100 can be fully utilized.

[0071] In the second aspect, the embodiments of the present application also propose an electronic device, including the electrochemical device 100 described in any of the above embodiments. The electronic device of the embodiments of the present application is not particularly limited, and it can be any electronic device known in the prior art. For example, electronic devices include but are not limited to Bluetooth headsets, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0072] 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. A hard shell battery, comprising a conductive shell enclosing a receiving cavity, an electrode assembly received in the receiving cavity, an electrode column insulated and connected to the shell, and a mounting circuit board, characterized in that: The electrode assembly is provided with a first pole ear and a second pole ear, the first pole ear and the second pole ear extend from the same end of the electrode assembly, along the direction in which the first pole ear and the second pole ear extend, the outer surface of the shell is convexly provided with a first extension portion and a second extension portion arranged at intervals, the mounting circuit board is fixed between the first extension portion and the second extension portion, and the mounting circuit board is electrically connected to the first pole ear and the second pole ear; the thickness of the hard shell battery, the first extension portion and the second extension portion is L, L≤3mm; The first extension portion defines a first cavity communicating with the accommodating cavity, and the first pole tab extends into the first cavity; The second extension portion defines a second cavity communicating with the accommodating cavity, and the second pole tab extends into the second cavity; The pole includes a first part and a second part connected to each other, the first extension portion has a second sub-side wall, the shell has a third side wall, and the second sub-side wall is arranged opposite to the third side wall along the thickness direction of the hard shell battery. The first part is attached to the inner wall of the first extension portion through an insulating member, the first part is electrically connected to the first pole ear, and the second part is exposed from the thickness direction of the hard shell battery and from the second sub-side wall.

2. The hard shell battery according to claim 1, characterized in that: The first extension portion defines a through hole communicating with the first cavity, the first portion covers the through hole, one end of the second portion is connected to a wall of the first portion facing the through hole, and the second portion is at least partially located in the through hole.

3. The hard case battery according to claim 2, characterized in that: The insulating member is disposed between the first portion and the first extending portion to insulate and separate the first extending portion and the first portion.

4. The hard case battery according to claim 2, characterized in that: The first pole tab is bent in a direction parallel to the first portion, and the first pole tab is attached and connected to an end surface of the first portion that is away from the second portion.

5. The hard case battery according to claim 1, characterized in that: The hard case battery further includes a mounting circuit board, which is disposed between the first extension portion and the second extension portion, and is electrically connected to the first pole tab and the second pole tab.

6. The hard case battery according to claim 5, characterized in that: The hard shell battery also includes a first adapter and a second adapter; One end of the first adapter is disposed in the first cavity and electrically connected to the first tab, and the other end extends outside the first extension portion and electrically connected to the mounting circuit board; One end of the second adapter is disposed in the second cavity and electrically connected to the second tab, and the other end extends outside the second extension portion and electrically connected to the mounting circuit board.

7. The hard case battery according to claim 1, characterized in that: The housing has a connecting wall facing away from the accommodating cavity, and the connecting wall is arranged between the first extending portion and the second extending portion; The housing further includes a first chamfered portion and a second chamfered portion; The first chamfered portion is disposed on a side of the first extension portion facing the second extension portion, the first chamfered portion is in an arc shape recessed toward the accommodating cavity, and the first chamfered portion is connected to the first extension portion and the connecting wall surface; The second chamfered portion is disposed on a side of the second extending portion facing the first extending portion, the second chamfered portion is in an arc shape recessed toward the accommodating cavity, and the second chamfered portion is connected to the second extending portion and the connecting wall surface.

8. The hard case battery according to claim 2, characterized in that: The housing has a first side wall on a side of the first electrode tab and the second electrode tab away from the electrode assembly, and the first extension portion and the second extension portion are both extended from the first side wall in a direction away from the electrode assembly; Along a first direction, the hard shell battery further includes a second side wall and a third side wall that are oppositely arranged, the first side wall is connected between the second side wall and the third side wall, and the first direction is a thickness direction of the electrode assembly; The first extension portion has a second sub-side wall, the through hole is opened in the second sub-side wall, the second sub-side wall is flush with the second side wall, or the second sub-side wall is extended from the second side wall; Along the second direction, the hard shell battery further includes a fourth side wall and a fifth side wall arranged opposite to each other, the fourth side wall is connected to the second side wall and the third side wall, and the fifth side wall is connected to the second side wall and the third side wall; The first extension portion includes a fourth sub-side wall facing away from the second extension portion, the fourth sub-side wall is connected to the fourth side wall and flush with the fourth side wall, or the fourth sub-side wall is extended from the fourth side wall; The second extension portion includes a fifth sub-side wall away from the first extension portion, the fifth sub-side wall is connected to the fifth side wall and flush with the fifth side wall, or the fifth sub-side wall is extended from the fifth side wall; The direction from the electrode assembly to the first side wall, the first direction, and the second direction are perpendicular to each other.

9. The hard case battery according to claim 8, characterized in that: The hard shell battery meets at least one of the following conditions: (a) along the direction from the electrode assembly to the first side wall, the protruding height of the first extension portion is H1, which satisfies 1.1 mm ≤ H1 < 1.5 mm; (b) along the direction from the electrode assembly to the first side wall, the protruding height of the second extension portion is H2, satisfying 1.1 mm ≤ H2 < 1.5 mm; (c) The first side wall includes a first surface facing the accommodating cavity and a second surface away from the accommodating cavity. Along the direction from the first surface to the second surface, the thickness of the first side wall is D, satisfying 0.05 mm≤D≤0.2 mm.

10. An electronic device, characterized in that: Comprising the hard case battery as claimed in any one of claims 1 to 9.

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