Electrochemical device and electric equipment

Abstract

The embodiment of the application relates to the battery technical field, and discloses an electrochemical device and an electric equipment, the electrochemical device comprises a shell, a battery cell assembly, a first tab and a first adapter. The shell comprises a top cover and a bottom shell arranged oppositely, the battery cell assembly is accommodated in the shell, the battery cell assembly is a winding structure, one end of the first tab is connected with the battery cell assembly, the other end of the first tab is connected with the top cover, the first adapter is arranged on the side of the top cover away from the bottom shell, and one end of the first adapter is connected with the top cover. The surface of the top cover away from the bottom shell is provided with a first mark, the first mark has a first relative position relationship with the first tab, and the first mark has a second relative position relationship with the first adapter. In the above manner, the accuracy of the relative position relationship between the first adapter and the first tab can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to an electrochemical device and electrical equipment. Background Technology

[0002] Button batteries are widely used in Bluetooth headsets. When the bare cells of a button battery are wound, the magnetic field generated when current flows through them, due to their non-perfectly symmetrical structure, can adversely affect the sound quality of the Bluetooth headset. To reduce the electromagnetic interference of button batteries on Bluetooth headsets, a preset relative positional relationship is achieved between the adapter metal plate on the circuit board and the electrode tabs to offset some of the battery's residual magnetic field. The accuracy of the positional relationship between the adapter metal plate and the electrode tabs directly affects the effectiveness of magnetic field elimination. Therefore, how to provide a button battery structure that can accurately position the adapter metal plate and the electrode tabs is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0003] One objective of this application is to provide an electrochemical device and electrical equipment to improve the accuracy of the positional relationship between the adapter metal plate and the electrode tab.

[0004] In a first aspect, embodiments of this application provide an electrochemical device, including a housing, a battery cell assembly, a first tab, and a first adapter. The housing includes a top cover and a bottom cover disposed opposite to each other. The battery cell assembly is housed within the housing and has a wound structure. One end of the first tab is connected to the battery cell assembly, and the other end of the first tab is connected to the top cover. The first adapter is disposed on the side of the top cover facing away from the bottom cover, and one end of the first adapter is connected to the top cover. A first mark is provided on the surface of the top cover facing away from the bottom cover. The first mark has a first relative positional relationship with the first tab, and the first mark has a second relative positional relationship with the first adapter.

[0005] By providing a first mark on the surface of the top cover facing away from the bottom shell, having a first relative positional relationship between the first mark and the first electrode tab, and having a second relative positional relationship between the first mark and the first adapter, the position of the first electrode tab can be located by the first mark, thereby determining the installation position of the first adapter, which helps to improve the accuracy of the relative positional relationship between the first adapter and the first electrode tab.

[0006] In one or more of the above optional embodiments, the first identifier is a first positioning groove disposed on the surface of the top cover opposite to the bottom shell.

[0007] Compared to the first identifier being an icon printed or pasted on the surface of the top cover away from the bottom shell, the first identifier being a first positioning groove set on the surface of the top cover away from the bottom shell helps to reduce the problem of the first adapter assembly position being uncertain during installation due to icon wear.

[0008] In one or more of the above optional embodiments, the top cover includes a pole post and a top wall, the top wall is disposed opposite to the bottom shell, the pole post passes through the top wall, the first positioning groove is disposed in the top wall, the pole post and the top wall are insulatedly connected, the first electrode tab includes a first connection area and a second connection area, the battery cell assembly includes a first electrode plate, the first connection area is connected to the first electrode plate, the second connection area is connected to the pole post, the first adapter includes a third connection area and a fourth connection area, the third connection area is connected to the pole post, and the fourth connection area is used to connect to electrical equipment.

[0009] In one or more of the above optional embodiments, the depth of the first positioning groove along the direction from the top cover to the bottom shell is d1, and the thickness of the top wall is D1, 20% ≤ d1 / D1 ≤ 50%.

[0010] 20% ≤ d1 / D1 helps to reduce the problem of the first positioning groove being too shallow, which reduces the clarity of its boundary and makes it difficult to identify; d1 / D1 ≤ 50% helps to reduce the problem of the top cover being too deep, which reduces the structural strength of the top cover and causes it to break.

[0011] In one or more of the above optional embodiments, the depth d1 of the first positioning groove satisfies: 20μm≤d1<75μm.

[0012] The depth d1 of the first positioning groove is greater than or equal to 20μm, which helps to reduce the problem that the boundary of the first positioning groove is reduced due to the shallow depth of the first positioning groove, thus making it difficult to identify the first positioning groove; the depth d1 of the first positioning groove is less than 75μm, which helps to reduce the problem that the structural strength of the top cover 11 is too low due to the excessive depth of the first positioning groove, thus causing the top cover to break.

[0013] In one or more of the above optional embodiments, when viewed from the top cover toward the bottom shell, the line connecting the center of the pole post and the center of the first mark is the first reference line, the line connecting the center of the pole post and the center of the first connection area is the second reference line, and the included angle between the first reference line and the second reference line is α, 85°≤α≤95° or 175°≤α≤185°.

[0014] Choosing α = 90° or α = 180° helps reduce the complexity of the positioning algorithm. However, in practice, due to factors such as processing errors, the value of α in the final product may have a certain error. When α is selected as 90°, α is approximately equal to 90°, and α is 90° ± 5°. When α is selected as 180°, α is approximately equal to 180°, and α is 180° ± 5°.

[0015] In one or more of the above optional embodiments, when viewed from the top cover toward the bottom shell, the line connecting the center of the pole post and the center of the first connection area is the second reference line, the line connecting the center of the pole post and the center of the fourth connection area is the third reference line, and the angle between the second reference line and the third reference line is β, where 0°≤β≤45°.

[0016] Compared to β>45°, when the electrochemical device is in the charging / discharging state, the current flows in opposite directions on the first tab and the first adapter when viewed from the top cover to the bottom shell. The magnetic field generated by the first tab and the magnetic field generated by the first adapter can at least partially cancel each other out, which helps to weaken the magnetic field generated on the top cover side of the electrochemical device and improve the electromagnetic characteristics of the electrochemical device.

[0017] In one or more of the above optional embodiments, the cross-sectional shape of the first positioning groove is annular along the direction perpendicular to the top cover to the bottom shell.

[0018] The cross-sectional shape of the first positioning groove is annular. Compared with grooves whose cross-sectional shape is a single closed contour such as circle, triangle, or square, the area to be etched by the annular groove is smaller when using laser etching technology, which helps to reduce damage to the top cover structure. On the other hand, the annular groove has two edges, inner and outer. When using a CCD (Charge-Coupled Device) image recognition system for recognition, if one edge in the acquired image becomes unclear due to changes in ambient light, electronic interference, or other factors, the system can compare and cross-verify the features of the inner and outer edges, thereby improving the accuracy of recognition.

[0019] In one or more of the above optional embodiments, the electrochemical device includes a second tab and a second adapter. One end of the second tab is connected to the battery cell assembly, and the other end of the second tab is connected to the bottom shell. The second adapter is located on the side of the bottom shell facing away from the top cover, and one end of the second adapter is connected to the bottom shell. A second mark is provided on the surface of the bottom shell facing away from the top cover. The second mark and the second tab have a third relative positional relationship, and the second mark and the second adapter have a fourth relative positional relationship.

[0020] By providing a second mark on the surface of the bottom shell facing away from the top cover, having a third relative positional relationship between the second mark and the second electrode tab, and having a fourth relative positional relationship between the second mark and the second adapter, the position of the first electrode tab can be located by the second mark, and the installation position of the second adapter can be determined, which helps to improve the accuracy of the positional relationship between the second adapter and the second electrode tab.

[0021] In one or more of the above optional embodiments, the second identifier is a second positioning groove provided on the surface of the bottom shell opposite to the top cover.

[0022] Compared to the icon printed or pasted on the surface of the bottom shell opposite to the top cover, the second identifier is a second positioning groove set on the surface of the bottom shell opposite to the top cover, which helps to reduce the problem of the assembly position of the second adapter being uncertain during installation due to icon wear.

[0023] In one or more of the above optional embodiments, the depth of the second positioning groove along the direction from the bottom shell to the top cover is d2, and the thickness of the bottom shell is D2, 20% ≤ d2 / D2 ≤ 50%.

[0024] A depth of 20% ≤ d2 / D2 helps to reduce the problem of the second positioning groove being too shallow, which reduces the clarity of its boundary and makes it difficult to identify. A depth of d2 / D2 ≤ 50% helps to reduce the problem of the bottom shell being too deep, which reduces the structural strength of the bottom shell and causes it to break.

[0025] In one or more of the above optional embodiments, the depth d2 of the second positioning groove along the direction from the bottom shell to the top cover satisfies: 20μm≤d2<75μm.

[0026] The depth d2 of the second positioning groove is greater than or equal to 20μm, which helps to reduce the problem of the second positioning groove being difficult to identify due to its shallow depth. The depth d2 of the second positioning groove is less than 75μm, which helps to reduce the problem of the bottom shell being damaged due to its excessive depth.

[0027] In one or more of the above optional embodiments, the second tab includes a fifth connection area and a sixth connection area, the battery cell assembly includes a second electrode, the fifth connection area is connected to the second electrode, the sixth connection area is connected to the bottom shell, and the second adapter includes a seventh connection area and an eighth connection area, the seventh connection area is connected to the bottom shell, and the eighth connection area is used for connection with electrical equipment. Viewed from the bottom shell towards the top cover, the area where the bottom shell connects to the sixth connection area is offset from the second marking.

[0028] The area where the bottom shell is welded to the second electrode tab is offset from the second mark, which helps to reduce the problem of mark shape distortion or positional displacement when the sixth connection area is connected to the bottom shell, such as the high temperature during welding causing local deformation of the bottom shell.

[0029] In one or more of the above optional embodiments, when viewed from the top cover toward the bottom shell, the line connecting the center of the pole post and the center of the second mark is the fourth reference line, the line connecting the center of the pole post and the center of the fifth connection area is the fifth reference line, and the included angle between the fourth reference line and the fifth reference line is δ, 85°≤δ≤95° or 175°≤δ≤185°.

[0030] Choosing δ = 90° or δ = 180° helps reduce the complexity of the positioning algorithm. However, in practice, due to factors such as processing errors, the final product δ value may have a certain error. When δ is 90°, it is approximately equal to 90°, and δ is 90° ± 5°. When δ is 180°, it is approximately equal to 180°, and δ is 180° ± 5°.

[0031] In one or more of the above optional embodiments, when viewed from the top cover toward the bottom shell, the line connecting the center of the pole post and the center of the fifth connection area is the fifth reference line, the line connecting the center of the pole post and the center of the eighth connection area is the sixth reference line, and the angle between the fifth reference line and the sixth reference line is ε, where 0°≤ε≤45°.

[0032] Compared to ε>45°, when the electrochemical device is in the charging / discharging state, the current flows in opposite directions along the bottom shell to the top cover. The magnetic field generated by the second electrode and the magnetic field generated by the second adapter can at least partially cancel each other out, which helps to weaken the magnetic field generated on the bottom shell side of the electrochemical device and improve the electromagnetic characteristics of the electrochemical device.

[0033] In one or more of the above optional embodiments, the second identifier is a liquid injection hole provided on the bottom shell.

[0034] Using the injection hole as a second identifier simplifies the structure and reduces costs compared to embodiments that use other structures as a second identifier.

[0035] In one or more of the above optional embodiments, the electrochemical device further includes a sealing cap disposed at the injection port to close the injection port.

[0036] Secondly, embodiments of this application provide an electrical device, including the electrochemical device described above. Attached Figure Description

[0037] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0038] Figure 1 A perspective view of an electrochemical device provided in an embodiment of this application;

[0039] Figure 2 A schematic diagram of an electrochemical device provided in an embodiment of this application;

[0040] Figure 3 for Figure 2 Schematic diagram of the cross section at point AA;

[0041] Figure 4 A partial exploded view of an electrochemical device provided in an embodiment of this application;

[0042] Figure 5 This is a partial exploded view of an electrochemical device provided in an embodiment of this application;

[0043] Figure 6 A schematic diagram showing the relative positions of the first identifier, the first adapter, and the first electrode tab when viewed from the top cover toward the bottom shell of an electrochemical device provided in this application embodiment after concealing other structures;

[0044] Figure 7 A schematic diagram of a cell assembly and a first electrode of an electrochemical device provided in an embodiment of this application;

[0045] Figure 8 A schematic diagram of an electrochemical device provided in an embodiment of this application, viewed from the bottom shell toward the top cover;

[0046] Figure 9 This is a schematic diagram showing the relative positions of the second identifier, the second adapter, and the second electrode tab when viewed from the bottom shell toward the top cover, after concealing other structures of an electrochemical device provided in this application embodiment.

[0047] Figure 10 This is a schematic diagram of a cell assembly and a second tab of an electrochemical device provided in an embodiment of this application.

[0048] Explanation of key component symbols:

[0049] 1000. Electrochemical device;

[0050] 1. Shell;

[0051] 11. Top cover; 111. Pole post; 1111. First part; 1111a. First surface; 1112. Second part; 112. Top wall; 1121. First positioning groove; 1122. Through hole; 113. First insulating element; 114. Second insulating element; 12. Bottom shell; 121. Liquid injection hole; 13. Side wall; 1a. Receiving cavity;

[0052] 2. Battery cell assembly;

[0053] 3. First tab; 31. First connecting region; 32. Second connecting region;

[0054] 4. First adapter; 41. Third connection area; 42. Fourth connection area;

[0055] 5. Second pole piece; 51. Fifth connecting region; 52. Sixth connecting region;

[0056] 6. Second adapter; 61. Seventh connection area; 62. First connection area;

[0057] W1, First Reference Line; W2, Second Reference Line; W3, Third Reference Line; W4, Fourth Reference Line; W5, Fifth Reference Line; W6, Sixth Reference Line. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0059] It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not constitute a conflict.

[0060] Please see Figure 1-3 The electrochemical device 1000 includes a housing 1, a battery cell assembly 2, a first tab 3, and a first adapter 4. The housing 1 includes a top cover 11 and a bottom cover 12 disposed opposite to each other. The battery cell assembly 2 is housed within the housing 1 and has a wound structure. One end of the first tab 3 is connected to the battery cell assembly 2, and the other end of the first tab 3 is connected to the top cover 11. The first adapter 4 is located on the side of the top cover 11 facing away from the bottom cover 12, and one end of the first adapter 4 is connected to the top cover 11. A first mark a is provided on the surface of the top cover 11 facing away from the bottom cover 12. The first mark a has a first relative positional relationship with the first tab 3, and the first mark a has a second relative positional relationship with the first adapter 4.

[0061] During installation, the first identifier a and the first electrode 3 have a first relative positional relationship. The first identifier a serves to locate the position of the first electrode 3 inside the housing 1. Outside the housing 1, the first identifier a serves as a reference benchmark for the assembly of the first adapter 4, which can determine the installation position of the first adapter 4. After installation, the first adapter 4 and the first identifier a have a second relative positional relationship, thereby enabling the first adapter 4 and the first electrode 3 to have a preset relative positional relationship.

[0062] The electrochemical device 1000 provided in this application embodiment has a first mark a on the surface of the top cover 11 facing away from the bottom shell 12. The first mark a has a first relative positional relationship with the first electrode tab 3 and a second relative positional relationship with the first adapter 4. The first mark a is used to locate the position of the first electrode tab 3, thereby determining the installation position of the first adapter 4. This helps to improve the accuracy of the relative positional relationship between the first adapter 4 and the first electrode tab 3.

[0063] In some embodiments, the first identifier a is a first positioning groove 1121 disposed on the surface of the top cover 11 opposite to the bottom shell 12. Compared with other embodiments, where the first identifier a is an icon printed or pasted on the surface of the top cover 11 opposite to the bottom shell 12, the first identifier a being disposed on the surface of the top cover 11 opposite to the bottom shell 12, is beneficial to reduce the problem of the first adapter 4 being unable to be determined during installation due to icon wear.

[0064] Please see Figures 3-6 In some embodiments, the top cover 11 includes a pole post 111 and a top wall 112. The top wall 112 is disposed opposite to the bottom shell 12. The pole post 11 passes through the top wall 112. The first positioning groove 1121 is disposed on the top wall 112. The pole post 11 and the top wall 112 are insulatedly connected. The first electrode ear 3 includes a first connection area 31 and a second connection area 32. The first connection area 31 is connected to the first electrode plate. The second connection area 32 is connected to the pole post 111. The first adapter 4 includes a third connection area 41 and a fourth connection area 42. The third connection area 41 is connected to the pole post 111. The fourth connection area 42 is used to connect to electrical equipment.

[0065] In some embodiments, the second connection area 32 is welded to the surface of the first portion 1111 facing away from the second portion 1112.

[0066] In some embodiments, the third connection region 41 is welded to the surface of the second portion 1112 facing away from the first portion 1111.

[0067] In some embodiments, along the direction from the top cover 11 to the bottom shell 12, the depth of the first positioning groove 1121 is d1, and the thickness of the top wall 112 is D1, with 20% ≤ d1 / D1 ≤ 50%. 20% ≤ d1 / D1 helps to reduce the problem of the first positioning groove 1121 being difficult to identify due to its shallow depth, which reduces the clarity of its boundary. d1 / D1 ≤ 50% helps to reduce the problem of the top cover 11 being damaged due to its excessive depth, which reduces the structural strength of the top cover 11.

[0068] In some embodiments, along the direction from the top cover 11 to the bottom shell 12, the depth d1 of the first positioning groove 1121 satisfies: 20μm ≤ d1 < 75μm. A depth d1 greater than or equal to 20μm helps reduce the problem of reduced clarity of the boundary of the first positioning groove 1121 due to its shallow depth, thus making it difficult to identify. A depth d1 less than 75μm helps reduce the problem of low structural strength of the top cover 11 due to its excessive depth, thus preventing damage to the top cover 11.

[0069] In some embodiments, the first positioning groove 1121 is obtained by laser etching.

[0070] In some embodiments, the cross-sectional shape of the first positioning groove 1121 along the direction perpendicular to the top cover 11 to the bottom shell 12 is annular. Compared to grooves with a single closed contour such as a circle, triangle, or square, the annular groove requires less etching area when etched using laser etching, which helps reduce damage to the top cover 11 structure. Furthermore, the annular groove has inner and outer edges. When using a CCD (Charge-Coupled Device) image recognition system, if one edge in the acquired image becomes unclear due to changes in ambient light, electronic interference, or other factors, the system can compare and cross-verify the features of the inner and outer edges, thereby improving the accuracy of recognition.

[0071] In some embodiments, the cross-sectional shape of the first positioning groove 1121 is annular along the direction perpendicular to the top cover 11 to the bottom cover 12.

[0072] In other embodiments, the cross-sectional shape of the first positioning groove 1121 along the direction perpendicular to the top cover 11 to the bottom cover 12 is circular, triangular or square.

[0073] In some embodiments, the housing 1 further includes a side wall 13, one end of which is connected to the bottom housing 12, and a top wall 112 is disposed on the end of the side wall 13 away from the bottom housing 12. The top wall 112 and the side wall 13 are connected, and the top cover 11, the side wall 13 and the bottom housing 12 together enclose and form a receiving cavity 1a.

[0074] In some embodiments, the top wall 112 is provided with a through hole 1122, which extends through the top wall 112 along the direction from the top cover 11 to the bottom shell 12, and at least a portion of the pole post 111 is disposed in the through hole 1122.

[0075] In one embodiment, the top cover 11 further includes a first insulating member 113, which is disposed between the top wall 112 and the pole post 111. The insulating member connects the top wall 112 and the pole post 111, thereby insulating the top wall 112 from the pole post 111.

[0076] In some embodiments, the pole post 111 includes a first part 1111 and a second part 1112. The first part 1111 has a first surface 1111a, which is disposed away from the receiving cavity 1a. The second part 1112 extends out of the first surface 1111a. The first part 1111 is disposed in the receiving cavity 1a. The second part 1112 passes through the through hole 1122 along the direction from the bottom shell 12 to the top cover 11. Along the radial direction of the through hole 1122, there is a preset distance between the second part 1112 and the inner wall of the through hole 1122. One end of the first adapter 4 is welded to the end of the second part 1112 that extends out of the through hole 1122 along the direction from the bottom shell 12 to the top cover 11.

[0077] In some embodiments, the first insulating member 113 is an annular structure, and the second portion 1112 of the pole post 111 passes through the annular structure.

[0078] In some embodiments, the first insulating element 113 includes, but is not limited to, insulating adhesive.

[0079] In some embodiments, the top cover 11 further includes a second insulating member 114, which is disposed between the top wall 112 and the first adapter 4. The second insulating member 114 connects the top wall 112 and the first adapter 4, thereby insulating the top wall 112 from the first adapter 4.

[0080] In some embodiments, the second insulating element 114 includes, but is not limited to, insulating adhesive.

[0081] In some embodiments, the receiving cavity 1a is used to receive electrolyte (not shown in the figure), which wets the battery cell assembly 2, thereby causing an electrochemical reaction.

[0082] In some embodiments, the battery cell assembly 2 includes a first electrode, a separator, and a second electrode. The first electrode, the separator, and the second electrode are stacked and wound to form the battery cell assembly 2. The separator is disposed between the first electrode and the second electrode for insulating and separating the two.

[0083] Please see Figure 6 and Figure 7In some embodiments, the first relative positional relationship between the first identifier a and the first tab 3 includes: when viewed from the top cover 11 towards the bottom shell 12, the line connecting the center of the pole post 111 and the center of the first identifier a is the first reference line W1, and the line connecting the center of the pole post 111 and the center of the first connecting area 31 is the second reference line W2. The included angle between the first reference line W1 and the second reference line W2 is α, which can be selected from 0° to 360° according to the actual situation. In this application, the center of the pole post 111, the center of the first identifier a, the center of the first connecting area 31, and the centers of the components mentioned below are all the centers of the graphics presented by each component when viewed from the top cover 11 towards the bottom shell 12. When the graphics presented by the component are regular graphics, the center of the component is the geometric center of the graphics presented by the component. For example, in some embodiments, when viewed from the top cover 11 towards the bottom shell 12, the pole post is circular, and the center of the pole post is the center of the circle. When the graphics presented by the component are irregular graphics, the center of the component is the center of the smallest circle that can completely contain the graphics. Each component can be scanned with CT (computed tomography) to obtain images, and the center can be determined by image recognition.

[0084] In some embodiments, 85°≤α≤95° or 175°≤α≤185°. Choosing α=90° or α=180° helps reduce the complexity of the positioning algorithm. However, in practice, due to factors such as processing errors, the final product's α value may have some error. When α is selected as 90°, α is approximately equal to 90°, and α is 90°±5°. When α is selected as 180°, α is approximately equal to 180°, and α is 180°±5°.

[0085] In some embodiments, when viewed from the top cover 11 toward the bottom shell 12, the line connecting the center of the electrode post 111 and the center of the first connection area 31 is the second reference line W2, and the line connecting the center of the electrode post 111 and the center of the fourth connection area 42 is the third reference line W3. The angle between the second reference line W2 and the third reference line W3 is β, where 0°≤β≤45°. Compared to β>45°, when the electrochemical device 1000 is in a charging / discharging state, when viewed from the top cover 11 toward the bottom shell 12, the current flow direction on the first tab 3 and the first adapter 4 tends to be opposite. The magnetic field generated by the first tab 3 and the magnetic field generated by the first adapter 4 can at least partially cancel each other out, which is beneficial to weakening the magnetic field generated on the top cover 11 side of the electrochemical device 1000 and improving the electromagnetic characteristics of the electrochemical device 1000.

[0086] In some embodiments, the second relative positional relationship between the first identifier a and the first adapter 4 includes: the included angle between the first reference line W1 and the third reference line W3 is γ, and γ can be selected based on the values ​​of α and β. Figure 6Taking the illustrated embodiment as an example, the required relative positional relationship between the first electrode 3 and the second adapter 4 is that the included angle β = 0° between the second reference line W2 and the third reference line W3, α = 90°, and γ = 90° are selected. Wherein, Figure 6 In the middle, since the second reference line W2 coincides with the third reference line W3, the second reference line W2 is not shown.

[0087] It is understood that the first relative positional relationship between the first identifier a and the first electrode 3 and the second relative positional relationship between the first identifier a and the first adapter 4 are not limited to the definition in the above embodiments, and can be defined and set according to actual needs.

[0088] Please see Figure 3 and Figure 8 In some embodiments, the electrochemical device 1000 includes a second tab 5 and a second adapter 6. One end of the second tab 5 is connected to the battery cell assembly 2, and the other end of the second tab 5 is connected to the bottom shell 12. The second adapter 6 is located on the side of the bottom shell 12 facing away from the top cover 11, and one end of the second adapter 6 is connected to the bottom shell 12. A second mark b is provided on the surface of the bottom shell 12 facing away from the top cover 11. The second mark b has a third relative positional relationship with the second tab 5, and a fourth relative positional relationship with the second adapter 6.

[0089] During installation, the second mark b and the second tab 5 have a third relative positional relationship. The second mark b serves to locate the position of the second tab 5 inside the housing 1. Outside the housing 1, the second mark b serves as a reference datum for the assembly of the second adapter 6, which can determine the installation position of the second adapter 6. After installation, the second adapter 6 and the second mark b have a fourth relative positional relationship, thereby enabling the second adapter 6 and the second tab 5 to have a preset relative positional relationship.

[0090] The electrochemical device 1000 provided in this application embodiment has a second mark b on the surface of the bottom shell 12 facing away from the top cover 11. The second mark b has a third relative positional relationship with the second electrode 5 and a fourth relative positional relationship with the second adapter 6. The second mark b is used to locate the position of the first electrode 3 and determine the installation position of the second adapter 6, which helps to improve the accuracy of the positional relationship between the second adapter 6 and the second electrode 5.

[0091] In some embodiments, the second identifier b is a liquid injection hole 121 disposed on the bottom shell 12. Using the liquid injection hole 121 as the second identifier b, compared with embodiments that additionally provide other structures as the second identifier b, is beneficial for simplifying the structure and reducing costs.

[0092] In some embodiments, the cross-sectional shape of the injection hole 121 is circular along the direction perpendicular to the top cover 11 to the bottom cover 12.

[0093] In other embodiments, the second identifier b is a second positioning groove (not shown) provided on the surface of the bottom shell 12 opposite to the top cover 11. Compared to other embodiments where the second identifier b is an icon printed or pasted on the surface of the bottom shell 12 opposite to the top cover 11, the second identifier b being a second positioning groove provided on the surface of the bottom shell 12 opposite to the top cover 11 helps to reduce the problem of the assembly position of the second adapter 6 being uncertain during installation due to icon wear.

[0094] In some embodiments, the second positioning groove is obtained by laser etching.

[0095] In some embodiments, along the direction from the bottom shell to the top cover, the depth of the second positioning groove is d2, and the thickness of the bottom shell is D2, with 20% ≤ d2 / D2 ≤ 50%. 20% ≤ d2 / D2 helps to reduce the problem of reduced clarity of the boundary of the second positioning groove due to its shallow depth, thus making it difficult to identify; d2 / D2 ≤ 50% helps to reduce the problem of insufficient structural strength of the bottom shell 12 due to its excessive depth, thus preventing damage to the bottom shell 12.

[0096] In some embodiments, along the direction from the bottom shell 12 to the top cover 11, the depth d2 of the second positioning groove satisfies: 20μm ≤ d2 < 75μm. A depth d2 greater than or equal to 20μm helps reduce the problem of reduced clarity of the second positioning groove's boundary due to excessive shallowness, thus making it difficult to identify. A depth d2 less than 75μm helps reduce the problem of insufficient structural strength of the bottom shell 12 due to excessive depth, thus preventing damage to the bottom shell 12.

[0097] In some embodiments, the cross-sectional shape of the second positioning groove is annular along the direction perpendicular to the top cover 11 to the bottom shell 12. Compared to grooves with a single closed contour such as a circle, triangle, or square, the annular groove requires less etching area when etched using laser etching, which helps reduce damage to the bottom shell 12 structure. Furthermore, the annular groove has inner and outer edges. When using a CCD (Charge-Coupled Device) image recognition system, if one edge in the acquired image becomes unclear due to changes in ambient light, electronic interference, or other factors, the system can compare and cross-verify the features of the inner and outer edges, thereby improving the accuracy of recognition.

[0098] In some embodiments, the cross-sectional shape of the second positioning groove is annular along the direction perpendicular to the top cover 11 to the bottom cover 12.

[0099] In other embodiments, the cross-sectional shape of the second positioning groove along the direction perpendicular to the top cover 11 to the bottom cover 12 is circular, triangular, or square.

[0100] Please see Figure 3 , Figure 5 and Figures 8-10 In some embodiments, the second electrode tab 5 includes a fifth connection area 51 and a sixth connection area 52. The fifth connection area 51 is connected to the second electrode plate, and the sixth connection area 52 is connected to the bottom shell 12. The second adapter 6 includes a seventh connection area 61 and an eighth connection area 62. The seventh connection area 61 is connected to the bottom shell 12, and the eighth connection area 62 is used to connect to electrical equipment. Viewed from the bottom shell 12 towards the top cover 11, the area 122 where the bottom shell 12 connects to the sixth connection area 52 is offset from the second mark b. This offset of the area 122 where the bottom shell 12 connects to the sixth connection area 52 and the second mark b helps reduce problems such as mark shape distortion or positional shift when the sixth connection area 52 is connected to the bottom shell 12, for example, local deformation of the bottom shell 12 caused by high temperatures during welding.

[0101] In some embodiments, the fifth connection area 51 is welded to the surface of the bottom shell 12 facing the top cover 11.

[0102] In some embodiments, the seventh connection area 61 is welded to the surface of the bottom shell 12 facing away from the top cover 11.

[0103] Please see Figure 5 , Figure 9 and Figure 10 In some embodiments, the third relative positional relationship between the second identifier b and the second electrode 5 includes: when viewed from the top cover 11 toward the bottom shell 12, the line connecting the center of the electrode post 111 and the center of the second identifier b is the fourth reference line W4, the line connecting the center of the electrode post 111 and the center of the fifth connecting area 51 is the fifth reference line W5, and the included angle between the fourth reference line W4 and the fifth reference line W5 is δ, which can be selected from 0° to 360° according to the actual situation.

[0104] In some embodiments, 85°≤δ≤95° or 175°≤δ≤185°. Choosing δ=90° or δ=180° helps reduce the complexity of the positioning algorithm. However, in practice, due to factors such as processing errors, the final product's δ value may have some error. When δ is selected as 90°, δ is approximately equal to 90°, and δ is 90°±5°. When δ is selected as 180°, δ is approximately equal to 180°, and δ is 180°±5°.

[0105] In some embodiments, when viewed from the top cover 11 toward the bottom shell 12, the line connecting the center of the pole post 111 and the center of the fifth connection area 51 is the fifth reference line W5, and the line connecting the center of the pole post 111 and the center of the eighth connection area 62 is the sixth reference line W6. The angle between the fifth reference line W5 and the sixth reference line W6 is ε, where 0°≤ε≤45°. Compared to ε>45°, when the electrochemical device 1000 is in a charging / discharging state, when viewed from the bottom shell 12 toward the top cover 11, the current flow direction on the second tab 5 and the second adapter 6 tends to be opposite. The magnetic field generated by the second tab 5 and the magnetic field generated by the second adapter 6 can at least partially cancel each other out, which is beneficial to weaken the magnetic field generated on the bottom shell 12 side of the electrochemical device 1000 and improve the electromagnetic characteristics of the electrochemical device 1000.

[0106] In some embodiments, the fourth relative positional relationship between the second identifier b and the second adapter 6 includes: the angle between the fourth reference line W4 and the sixth reference line W6 is ζ, which can be selected based on the values ​​of δ and ε. Figure 9 Taking the embodiment shown as an example, the required relative positional relationship between the second electrode 5 and the second adapter 6 is that the included angle between the fourth reference line W4 and the sixth reference line W6 is ζ = 90°, δ = 180° is selected, and ε = 90° is selected.

[0107] It is understood that the third relative positional relationship between the second identifier b and the second electrode 5 and the fourth relative positional relationship between the second identifier b and the second adapter 6 are not limited to the definition in the above embodiments, and can be defined and set according to actual needs.

[0108] In some embodiments, the electrochemical device 1000 further includes a sealing cap (not shown) disposed at the injection port 121 to close the injection port 121.

[0109] Based on the same inventive concept, this application also provides an electrical device, including the electrochemical device 1000 in any of the above embodiments. The electronic devices in the embodiments of this application are not particularly limited and 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, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary 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.

[0110] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. An electrochemical device comprising a housing, a battery cell assembly, and a first electrode tab, wherein the housing includes a top cover and a bottom cover disposed opposite to each other, the battery cell assembly is housed within the housing, the battery cell assembly having a wound structure, one end of the first electrode tab is connected to the battery cell assembly, and the other end of the first electrode tab is connected to the top cover, characterized in that, The electrochemical device further includes a first adapter, which is located on the side of the top cover facing away from the bottom shell, and one end of the first adapter is connected to the top cover. The surface of the top cover facing away from the bottom shell is provided with a first mark, the first mark has a first relative positional relationship with the first electrode tab, and the first mark has a second relative positional relationship with the first adapter.

2. The electrochemical device according to claim 1, characterized in that, The first identifier is a first positioning groove provided on the surface of the top cover opposite to the bottom shell.

3. The electrochemical device according to claim 2, characterized in that, The top cover includes a pole and a top wall, the top wall being disposed opposite to the bottom shell, the pole passing through the top wall, the first positioning groove being disposed on the top wall, the pole being insulated from the top wall, the first tab including a first connection area and a second connection area, the cell assembly including a first electrode, the first connection area being connected to the first electrode, the second connection area being connected to the pole, the first adapter including a third connection area and a fourth connection area, the third connection area being connected to the pole, and the fourth connection area being used for connection with electrical equipment.

4. The electrochemical device according to claim 3, characterized in that, Along the direction from the top cover to the bottom shell, the depth of the first positioning groove is d1, and the thickness of the top wall is D1, 20% ≤ d1 / D1 ≤ 50%.

5. The electrochemical device according to claim 4, characterized in that, The depth d1 of the first positioning groove satisfies: 20μm≤d1≤75μm.

6. The electrochemical device according to claim 3, characterized in that, Looking from the top cover toward the bottom shell, the line connecting the center of the pole post and the center of the first mark is the first reference line, and the line connecting the center of the pole post and the center of the first connection area is the second reference line. The angle between the first reference line and the second reference line is α, where 85°≤α≤95° or 175°≤α≤185°.

7. The electrochemical device according to claim 3, characterized in that, Looking from the top cover toward the bottom shell, the line connecting the center of the pole post and the center of the first connection area is the second reference line, and the line connecting the center of the pole post and the center of the fourth connection area is the third reference line. The angle between the second reference line and the third reference line is β, where 0°≤β≤45°.

8. The electrochemical device according to claim 2, characterized in that, Along the direction perpendicular to the top cover towards the bottom shell, the cross-sectional shape of the first positioning groove is annular.

9. The electrochemical device according to any one of claims 1-8, characterized in that, The electrochemical device includes a second tab and a second adapter. One end of the second tab is connected to the battery cell assembly, and the other end of the second tab is connected to the bottom shell. The second adapter is located on the side of the bottom shell facing away from the top cover, and one end of the second adapter is connected to the bottom shell. The bottom shell has a second mark on the surface facing away from the top cover. The second mark has a third relative positional relationship with the second electrode tab, and the second mark has a fourth relative positional relationship with the second adapter.

10. The electrochemical device according to claim 9, characterized in that, The second identifier is a second positioning groove provided on the surface of the bottom shell opposite to the top cover.

11. The electrochemical device according to claim 10, characterized in that, Along the direction from the bottom shell to the top cover, the depth of the second positioning groove is d2, and the thickness of the bottom shell is D2, 20% ≤ d2 / D2 ≤ 50%.

12. The electrochemical device according to claim 11, characterized in that, The depth d2 of the second positioning groove satisfies: 20μm≤d2≤75μm.

13. The electrochemical device according to claim 9, characterized in that, The second electrode includes a fifth connection area and a sixth connection area. The battery cell assembly includes a second electrode. The fifth connection area is connected to the second electrode, and the sixth connection area is connected to the bottom shell. The second adapter includes a seventh connection area and an eighth connection area. The seventh connection area is connected to the bottom shell, and the eighth connection area is used to connect to electrical equipment. Viewed along the direction from the bottom shell to the top cover, the area where the bottom shell connects to the sixth connection area is offset from the second mark.

14. The electrochemical device according to claim 13, characterized in that, Looking from the top cover toward the bottom shell, the line connecting the center of the pole post and the center of the second mark is the fourth reference line, and the line connecting the center of the pole post and the center of the fifth connection area is the fifth reference line. The angle between the fourth reference line and the fifth reference line is δ, where 85°≤δ≤95° or 175°≤δ≤185°.

15. The electrochemical device according to claim 13, characterized in that, Looking from the top cover toward the bottom shell, the line connecting the center of the pole post and the center of the fifth connection area is the fifth reference line, and the line connecting the center of the pole post and the center of the eighth connection area is the sixth reference line. The angle between the fifth reference line and the sixth reference line is ε, where 0°≤ε≤45°.

16. The electrochemical device according to claim 9, characterized in that, The second identifier is a liquid injection hole provided on the bottom shell.

17. The electrochemical device according to claim 16, characterized in that, The electrochemical device also includes a sealing cap disposed at the injection port to close the injection port.

18. An electrical appliance, characterized in that, Includes the electrochemical device as described in any one of claims 1-17.

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