Electrochemical device and electronic equipment
By setting the parameter of the dislocation distance between bare cells, the problems of poor welding of multiple batteries and mismatch in the prior art are solved, and the electrical performance guarantee and safety improvement of electrochemical devices are achieved.
Patent Information
- Application Number
- CN202420504572.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-03-15
AI Technical Summary
Due to the limitations of the chemical system, existing chemical power supplies are difficult to exceed 5V voltage, which leads to multiple external electrical connections of multiple batteries that require welding multiple times, which is prone to poor welding and mismatch of electrical properties, which leads to the internal electrical connection of the bare battery cell to reduce the number of welding times but have alignment problems, which may lead to poor conditions such as lithium extraction and black spots.
By setting the alignment parameters between the two bare cells, including limiting the maximum dislocation distances of the length direction, and the maximum dislocation distances of the width direction, it is ensured that the maximum dislocations L1, L2 and L3 meet specific range limitations, such as when A≤1.5mm, B≤1mm and C≤1mm, L1≤A, L2≤B, L3≤C, to prevent uneven pressures caused by the assembly of the bare cell.
By limiting the misalignment distance between the bare electric cells, the stress on the contact surface can be uniform, and the occurrence of adverse conditions such as lithium extraction and black spots can be avoided, thereby ensuring the electrical performance of the electrochemical device and improving its safety and reliability.
Smart Images
Figure CN222705659U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and in particular relates to an electrochemical device and an electronic device. Background Art
[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium-ion batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides a broad space for the application and development of lithium-ion batteries.
[0003] Among them, the existing chemical power source is difficult to exceed 5V voltage due to the limitation of the chemical system, but many electrical equipment need to use more than 5V, so multiple batteries need to be used at the same time to increase the voltage. The external electrical connection of multiple batteries needs to be used multiple times for simultaneous use, but multiple welding is prone to poor welding, and multiple cells are prone to electrical performance mismatch. The internal electrical connection of multiple bare cells can greatly reduce the number of welding times and improve battery consistency. However, there is a problem of alignment of multiple bare cells. If they are not aligned, it will cause uneven pressure on the side, resulting in lithium deposition, black spots, etc. For this reason, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content
[0004] One of the purposes of the utility model is to provide an electrochemical device to address the deficiencies of the prior art, which ensures its electrical performance and improves safety and reliability by setting the alignment parameters between two bare battery cells.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] An electrochemical device comprises a housing, an electrolyte filled in the housing, and at least two bare cells contained in the electrolyte and stacked and electrically connected, wherein a partition is provided between two adjacent stacked bare cells, and maximum misalignments L1 and L2 are formed at one end between the two adjacent stacked bare cells;
[0007] Each of the bare cells comprises an anode sheet and a cathode sheet wound in sequence and a separator therebetween, the protruding portion between the separator and the cathode sheet is A, and the protruding portion between the separator and the cathode sheet is B; when A≤1.5mm, B≤1mm, the maximum misalignments L1 and L2 must satisfy: L1≤A, L2≤B.
[0008] In the utility model, the bare battery cell is a winding structure. By limiting the maximum value of the misalignment distance in the length direction between the two bare battery cells, it is possible to prevent the uneven pressure caused by the assembly of the two bare battery cells, thereby reducing the possibility of adverse conditions such as lithium deposition and black spots in the bare battery cells, thereby ensuring the electrical performance of the electrochemical device and improving its safety and reliability.
[0009] As an improvement of the electrochemical device described in the utility model, when A≤1.5mm and B≤1mm, the maximum misalignments L1 and L2 need to satisfy: L1≤1.1mm, L2≤0.8mm.
[0010] As an improvement of the electrochemical device described in the utility model, each of the bare cells includes a first diaphragm in contact with one of the cathode sheets and a second diaphragm in contact with another adjacent cathode sheet, and the distance between the contact surfaces of the first diaphragm and the second diaphragm in contact with the two cathode sheets is H; when 3mm≥A>1.5mm, 2.5mm≥B>1mm, the maximum misalignments L1 and L2 must meet the following requirements: The application scope of the utility model is broadened and the applicability is enhanced.
[0011] As an improvement of the electrochemical device described in the utility model, when 3mm≥A>1.5mm, 2.5mm≥B>1mm, the maximum misalignments L1 and L2 need to satisfy: L1≤1.9mm, L2≤1.6mm.
[0012] The second object of the utility model is to provide an electrochemical device, comprising a housing, an electrolyte filled in the housing, and at least two bare cells contained in the electrolyte and stacked and electrically connected, wherein a partition is provided between two adjacent stacked bare cells, and a maximum misalignment L1 and L2 is formed at one end between the two adjacent stacked bare cells, and a maximum misalignment L3 is formed at the other end;
[0013] Each of the bare battery cells includes an anode sheet, a cathode sheet and a separator therebetween which are stacked in sequence, the protruding portion of the separator and the cathode sheet's head is A, the protruding portion of the separator and the cathode sheet's tail is B, and the horizontal protruding portion of the separator and the cathode sheet is C; when A≤1.5mm, B≤1mm and C≤1mm, the maximum misalignments L1, L2 and L3 must satisfy: L1≤A, L2≤B, L3≤C.
[0014] In the utility model, the bare battery cell is a stacked structure. By limiting the maximum value of the misalignment distance between the two bare battery cells in the length direction and the width direction, the two bare battery cells are prevented from being subjected to uneven force, resulting in lithium deposition and the generation of black spots, thereby ensuring the electrical performance of the electrochemical device and improving its safety and reliability.
[0015] As an improvement to the electrochemical device described in the utility model, when A≤1.5mm, B≤1mm and C≤1mm, the maximum misalignments L1, L2 and L3 need to satisfy: L1≤1.3mm, L2≤0.6mm, L3≤1mm.
[0016] As an improvement to the electrochemical device described in the utility model, when A≤1.5mm, B≤1mm and C≤1mm, the maximum misalignments L1, L2 and L3 need to satisfy: L1≤1.1mm, L2≤0.4mm, L3≤0.8mm.
[0017] As an improvement of the electrochemical device described in the utility model, each of the bare cells includes a first diaphragm in contact with one of the cathode sheets and a second diaphragm in contact with another adjacent cathode sheet, and the distance between the contact surfaces of the first diaphragm and the second diaphragm in contact with the two cathode sheets is H; when 3mm≥A>1.5mm, 2.5mm≥B>1mm, 2.5mm≥C>1mm, the maximum misalignments L1, L2 and L3 need to meet the following requirements: The application scope of the utility model is broadened, the applicability is enhanced, and the occurrence of uneven force on the two bare cells is further prevented.
[0018] As an improvement to the electrochemical device described in the utility model, when 3mm≥A>1.5mm, 2.5mm≥B>1mm, 2.5mm≥C>1mm, the maximum misalignments L1, L2 and L3 need to satisfy: L1≤1.9mm, L2≤1.4mm, L3≤1.6mm.
[0019] The third object of the present utility model is to provide an electronic device comprising the electrochemical device as described above.
[0020] The beneficial effect of the utility model lies in that the electrochemical device of the utility model limits the range of L1 and L2 between the bare battery cells of the two winding structures, and limits the range of L1, L2 and L3 between the bare battery cells of the two stacked structures. By setting the maximum value of the distance between the two bare battery cells, the force on the contact surface between the two bare battery cells can be uniform, avoiding the adverse conditions of lithium deposition or black spots, thereby ensuring the electrical performance and improving the safety and reliability. At the same time, the range of bare battery cell assembly error is set to facilitate mass production. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
[0022] Figure 1 It is a structural schematic diagram of implementation mode 1 of the present utility model.
[0023] Figure 2 It is a schematic diagram of the structure of two bare cells misaligned in the first embodiment of the utility model.
[0024] Figure 3 It is a structural schematic diagram of implementation mode 2 of the present utility model.
[0025] Figure 4 It is a schematic diagram of the structure of two bare cells misaligned in the second embodiment of the utility model.
[0026] Figure 5 It is a schematic diagram of the structure of a partially bare battery cell in the utility model.
[0027] The reference numerals are described as follows:
[0028] 1-shell; 11-upper shell; 12-lower shell
[0029] 2-bare cell; 21-first end; 22-second end; 23-first side; 24-second side; 25-anode sheet; 26-cathode sheet; 271-first diaphragm; 272-second diaphragm;
[0030] 3- Partition;
[0031] 4-Pole ear;
[0032] Y-length direction; X-width direction. DETAILED DESCRIPTION
[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.
[0035] Reference to "embodiment" in this application 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 this phrase in various places 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.
[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0037] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.
[0038] The term "plurality" used in the present application refers to two or more (including two).
[0039] The development of battery technology must take into account multiple design factors at the same time, for example, performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, battery safety must also be considered. In existing electrochemical devices in which multiple bare cells are electrically connected, due to assembly problems, errors may occur between the multiple bare cells, and they cannot be completely aligned, resulting in undesirable conditions such as lithium deposition or black spots in the electrochemical device. In view of this, the present embodiment solves the above problem by limiting the range of errors between the multiple bare cells.
[0040] The following is combined with Figures 1 to 5 The present invention is further described in detail with specific implementation modes, but it is not intended to limit the present invention. It should be noted that: Figure 5 T in the middle means The dotted line represents , does not exist in the actual structure.
[0041] Electrochemical Devices
[0042] like Figure 1 , 2As shown in Figure 5, an electrochemical device comprises: a shell 1, an electrolyte filled in the shell 1, and two bare cells 2 contained in the electrolyte and stacked and electrically connected, the shell 1 comprises an upper shell 11 and a lower shell 12 which are connected to each other or formed in one piece, and are easy to assemble, a partition 3 is provided between two adjacent stacked bare cells 2, a tab 4 is extended from the bare cell 2, and in the length direction Y, the bare cell 2 has a first end 21 close to the tab 4 and a second end 22 away from the tab 4, the first ends 21 of the two bare cells 2 form a misalignment L1 in the length direction Y, and the second ends 22 of the two bare cells form a misalignment L2 in the length direction Y;
[0043] Each bare cell 2 includes an anode sheet 25, a cathode sheet 26, and a separator therebetween, the portion of the separator and the head of the cathode sheet 26 extending beyond the separator is A, the portion of the separator and the tail of the cathode sheet 26 extending beyond the separator is B, wherein the head of the cathode sheet 26 corresponds to the first end 21, and the tail of the cathode sheet 26 corresponds to the second end 22;
[0044] When A≤1.5mm, B≤1mm, the maximum misalignment L1 and L2 must meet the following conditions: L1≤A, L2≤B; when 3mm≥A>1.5mm, 2.5mm≥B>1mm, the maximum misalignment L1 and L2 must meet the following conditions:
[0045]
[0046] Each bare cell 2 includes a first diaphragm 271 in contact with one cathode sheet 26 and a second diaphragm 272 in contact with another adjacent cathode sheet 26 , and the distance between the contact surfaces of the first diaphragm 271 and the second diaphragm 272 respectively contacting the two cathode sheets 26 is H.
[0047] The setting of the above parameters can be applied to most electrochemical devices formed by multiple bare battery cells 2 with a winding structure, thereby improving applicability. At the same time, by limiting the misalignment distance in the length direction Y between the two bare battery cells 2, the occurrence of adverse conditions such as lithium deposition and black spots due to uneven force on the two bare battery cells 2 can be prevented, thereby ensuring the electrical performance of the electrochemical device and improving its safety and reliability.
[0048] In this embodiment, Figure 5 Only The length of the description is as follows, it can be understood that The calculation method and expression of the length of The principle is the same, only the parameters need to be changed.
[0049] In some other embodiments, the electrochemical device includes multiple bare battery cells 2, and in this case L1 is the maximum value of the misalignment formed by the multiple first ends 21 in the length direction Y, L2 is the maximum value of the misalignment formed by the multiple second ends 22 in the length direction Y, A is the minimum value of the protruding parts of the heads of the diaphragm and the cathode sheet 26 in the multiple bare battery cells 2, and B is the minimum value of the protruding parts of the tails of the diaphragm and the cathode sheet 26 in the multiple bare battery cells 2. The number of bare battery cells 2 can be adjusted according to actual needs without specific setting.
[0050] In order to better illustrate the beneficial effects brought about by this embodiment, the following examples and comparative examples are provided for illustration.
[0051] A plurality of bare cells 2 were prepared, wherein A was 1.1 mm and B was 0.8 mm. Every two bare cells 2 were electrically connected and placed in a shell 1 to form an electrochemical device, which was then formed under the same environment. The numerical settings of L1 and L2 of the comparative example and the embodiment and the results of viewing the interface after formation are shown in Table 1.
[0052] Table 1
[0053] category L1 L2 Results Example 1 0.7mm 0.5mm No lithium deposition and black spots appear Example 2 0.4mm 0.3mm No lithium deposition and black spots appear Comparative Example 1 1.5mm 0.5mm Black spots appear on the top and lithium deposition occurs around the black spots Comparative Example 2 0.4mm 1.3mm Black spots appear at the bottom and lithium deposition occurs around the black spots Comparative Example 3 1.5mm 1.3mm There are black spots around and lithium deposition around the black spots
[0054] A plurality of bare cells 2 were prepared, wherein A was 2 mm, B was 1.7 mm, and H was 0.5 mm. Every two bare cells 2 were electrically connected and placed in a shell 1 to form an electrochemical device, which was formed under the same environment. The numerical settings of L1 and L2 of the comparative example and the embodiment and the results of viewing the interface after formation are shown in Table 2.
[0055] Table 2
[0056] category L1 L2 Results Example 3 1.5mm 0.8mm No lithium deposition and black spots appear Example 4 1.1mm 1.2mm No lithium deposition and black spots appear Comparative Example 4 2.2mm 0.8mm Black spots appear on the top and lithium deposition occurs around the black spots Comparative Example 5 1.1mm 1.9mm Black spots appear at the bottom and lithium deposition occurs around the black spots Comparative Example 6 2.3mm 2mm There are black spots around and lithium deposition around the black spots
[0057] According to the above table, in order to improve the safety and reliability of the electrochemical device and ensure its electrical performance, the maximum value of the misalignment distance in the length direction Y between the two bare cells 2 should be limited.
[0058] Electrochemical Devices
[0059] like Figure 3 , 4As shown in Figure 5, an electrochemical device comprises: a shell 1, an electrolyte filled in the shell 1, and two bare cells 2 contained in the electrolyte and stacked and electrically connected, the shell 1 comprises an upper shell 11 and a lower shell 12 which are connected to each other or formed in one piece, and are convenient for assembly, a partition 3 is provided between two adjacent stacked bare cells 2, a pole ear 4 is extended from the bare cell 2, in the length direction Y, the bare cell 2 has a first end 21 close to the pole ear 4 and a second end 22 away from the pole ear 4, the first ends 21 of the two bare cells 2 form a misalignment L1 in the length direction Y, the second ends 22 of the two bare cells form a misalignment L2 in the length direction Y, in the width direction X, the bare cell 2 has a first side 23 and a second side 24 which are perpendicular to the first end 21, the first side 23 and the second side 24 are parallel to each other, and the first side 23 or the second side 24 of the two bare cells 2 form a misalignment L3 in the width direction X;
[0060] Each bare cell 2 includes an anode sheet 25, a cathode sheet 26 stacked in sequence, and a separator therebetween, the portion of the separator and the head of the cathode sheet 26 extending beyond the separator is A, the portion of the separator and the tail of the cathode sheet 26 extending beyond the separator is B, and the portion of the separator and the horizontal portion of the cathode sheet 26 extending beyond the separator is C, wherein the head of the cathode sheet 26 corresponds to the position of the first end 21, the tail of the cathode sheet 26 corresponds to the position of the second end 22, the horizontal direction of the cathode sheet 26 is parallel to the width direction X, and the two sides of the separator are the same as the horizontal portions C of the two sides of the cathode sheet 26;
[0061] When A≤1.5mm, B≤1mm and C≤1mm, the maximum misalignment L1, L2 and L3 must meet the following conditions: L1≤A, L2≤B, L3≤C;
[0062] When 3mm≥A>1.5mm, 2.5mm≥B>1mm, 2.5mm≥C>1mm, the maximum misalignment L1, L2 and L3 must meet the following requirements:
[0063] Among them, each bare cell 2 includes a first diaphragm 271 in contact with a cathode sheet 26 and a second diaphragm 272 in contact with another adjacent cathode sheet 26, and the distance between the contact surfaces of the first diaphragm 271 and the second diaphragm 272 respectively contacting the above two cathode sheets 26 is H.
[0064] The setting of the above parameters can be applied to most electrochemical devices formed by bare cells 2 of multiple stacked structures, thereby improving applicability. At the same time, by limiting the offset distance between two bare cells 2 in the length direction Y and the width direction X, the occurrence of adverse conditions such as lithium deposition and black spots due to uneven force on the two bare cells 2 can be prevented, thereby ensuring the electrical performance of the electrochemical device and improving its safety and reliability.
[0065] In this embodiment, Figure 5 Only The length of the description is as follows, it can be understood that and The calculation method and expression of the length of The principle is the same, only the parameters need to be changed.
[0066] In some other embodiments, the electrochemical device includes multiple bare battery cells 2, and in this case L1 is the maximum value of the misalignment formed by the multiple first ends 21 in the length direction Y, L2 is the maximum value of the misalignment formed by the multiple second ends 22 in the length direction Y, L3 is the maximum value of the misalignment formed by the multiple first sides 23 or the second sides 24 in the width direction X, A is the minimum value of the head protruding part of the diaphragm and the cathode sheet 26 in the multiple bare battery cells 2, B is the minimum value of the tail protruding part of the diaphragm and the cathode sheet 26 in the multiple bare battery cells 2, C is the minimum value of the horizontal protruding part of the diaphragm and the cathode sheet 26 in the multiple bare battery cells 2, and the number of bare battery cells 2 can be adjusted according to actual needs without specific setting.
[0067] In order to better illustrate the beneficial effects brought about by this embodiment, the following examples and comparative examples are provided for illustration.
[0068] A plurality of bare cells 2 were prepared, wherein A was 1.3 mm, B was 1 mm, and C was 0.6 mm. Every two bare cells 2 were electrically connected and placed in a shell 1 to form an electrochemical device, which was formed under the same environment. The numerical settings of L1 and L2 of the comparative example and the embodiment and the results of viewing the interface after formation are shown in Table 3.
[0069] Table 3
[0070]
[0071] A plurality of bare cells 2 were prepared, wherein A was 1.1 mm, B was 0.8 mm, and C was 0.4 mm. Every two bare cells 2 were electrically connected and placed in a shell 1 to form an electrochemical device, which was formed under the same environment. The numerical settings of L1, L2, and L3 of the comparative example and the embodiment and the results of viewing the interface after formation are shown in Table 4.
[0072] Table 4
[0073]
[0074] A plurality of bare cells 2 were prepared, wherein A was 2 mm, B was 1.7 mm, C was 1.5 mm, and H was 0.5 mm. Every two bare cells 2 were electrically connected and placed in a shell 1 to form an electrochemical device, which was formed under the same environment. The numerical settings of L1, L2, and L3 of the comparative example and the embodiment and the results of viewing the interface after formation are shown in Table 5.
[0075] Table 5
[0076]
[0077]
[0078] According to the above table, in order to improve the safety and reliability of the electrochemical device and ensure its electrical performance, the maximum value of the offset distance between the two bare cells 2 in the length direction Y and the width direction X should be limited.
[0079] Electronic devices
[0080] An electronic device includes the above-mentioned electrochemical device, and the electrochemical device can be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc. Among them, the electronic device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical devices.
[0081] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.
Claims
1. An electrochemical device, characterized in that: The invention comprises a shell (1), an electrolyte filled in the shell (1), and at least two bare cells (2) contained in the electrolyte and stacked and electrically connected, a partition (3) being provided between two adjacent stacked bare cells (2), and maximum misalignments L1 and L2 being formed at one end between the two adjacent stacked bare cells (2); Each of the bare cells (2) comprises an anode sheet (25) and a cathode sheet (26) which are wound in sequence, and a separator located therebetween, wherein the portion of the separator extending from the head of the cathode sheet (26) is A, and the portion of the separator extending from the tail of the cathode sheet (26) is B; When A≤1.5mm, B≤1mm, the misalignment must satisfy: L1≤A, L2≤B.
2. The electrochemical device according to claim 1, characterized in that: When A≤1.5mm, B≤1mm, the maximum misalignments L1 and L2 must satisfy: L1≤1.1mm, L2≤0.8mm.
3. The electrochemical device according to claim 1, characterized in that: Each of the bare cells (2) comprises a first diaphragm (271) in contact with one of the cathode sheets (26) and a second diaphragm (272) in contact with another adjacent cathode sheet (26), and the distance between the contact surfaces of the first diaphragm (271) and the second diaphragm (272) respectively contacting the two cathode sheets (26) is H; When 3mm≥A>1.5mm, 2.5mm≥B>1mm, the misalignment must meet the following conditions:
4. The electrochemical device according to claim 3, characterized in that: When 3mm≥A>1.5mm, 2.5mm≥B>1mm, the misalignment must satisfy: L1≤1.9mm, L2≤1.6mm.
5. An electrochemical device, characterized in that: The invention comprises a shell (1), an electrolyte filled in the shell (1), and at least two bare cells (2) contained in the electrolyte and stacked and electrically connected, wherein a partition (3) is provided between two adjacent stacked bare cells (2), and maximum misalignments L1 and L2 are formed at one end between the two adjacent stacked bare cells (2), and a maximum misalignment L3 is formed at the other end; Each of the bare cells (2) comprises an anode sheet (25), a cathode sheet (26) and a separator located therebetween, wherein the portion of the separator extending from the head of the cathode sheet (26) is A, the portion of the separator extending from the tail of the cathode sheet (26) is B, and the portion of the separator extending from the horizontal of the cathode sheet (26) is C; When A≤1.5mm, B≤1mm and C≤1mm, the misalignment must satisfy: L1≤A, L2≤B, L3≤C.
6. The electrochemical device according to claim 5, characterized in that: When A≤1.5mm, B≤1mm and C≤1mm, the misalignment must satisfy: L1≤1.3mm, L2≤1mm, L3≤0.6mm.
7. The electrochemical device according to claim 5, characterized in that: When A≤1.5mm, B≤1mm and C≤1mm, the misalignment must satisfy: L1≤1.1mm, L2≤0.8mm, L3≤0.4mm.
8. The electrochemical device according to claim 5, characterized in that: Each of the bare cells (2) comprises a first diaphragm (271) in contact with one of the cathode sheets (26) and a second diaphragm (272) in contact with another adjacent cathode sheet (26), and the distance between the contact surfaces of the first diaphragm (271) and the second diaphragm (272) respectively contacting the two cathode sheets (26) is H; When 3mm≥A>1.5mm, 2.5mm≥B>1mm, 2.5mm≥C>1mm, the misalignment must meet the following requirements:
9. The electrochemical device according to claim 5, characterized in that: When 3mm≥A>1.5mm, 2.5mm≥B>1mm, 2.5mm≥C>1mm, the misalignment must satisfy: L1≤1.9mm, L2≤1.6mm, L3≤1.4mm.
10. An electronic device, characterized in that: The invention comprises an electrochemical device as claimed in any one of claims 1 to 9.