Electrochemical device and electric equipment
By setting clearance notches at the edges of the electrode terminals and optimizing the design of conductive components, the problem of insufficient space for battery components was solved, thereby improving the energy density and connection strength of the electrochemical device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN NVT TECH
- Filing Date
- 2025-05-15
- Publication Date
- 2026-05-01
AI Technical Summary
Existing batteries, due to insufficient space for component placement, have increased battery length, which affects energy density.
By providing clearance notches at the edges of the electrode terminals and ensuring that the circuit functional modules are at least partially located in the clearance notches along the third direction, the space occupied by the electrochemical device in the third direction is reduced. At the same time, by optimizing the design of the conductive components, the space occupied in the second direction is reduced.
It improves the energy density of electrochemical devices, reduces the space occupied by batteries in all directions, increases the space for component placement, and improves connection strength.
Smart Images
Figure CN224190989U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of energy storage technology, and in particular to an electrochemical device and an electrical appliance. Background Technology
[0002] Influenced by electronic products, batteries used for charging and discharging in electronic products are gradually developing towards thinner and more compact structures to fit smaller and thinner electronic devices. The more compact the battery, the greater the space required for the battery's protection circuit board. Due to insufficient space, components are currently typically placed on both sides of the protection circuit board. However, this approach increases the battery's length and affects its energy density. Utility Model Content
[0003] In view of this, this application provides an electrochemical device that is advantageous for improving energy density.
[0004] This application provides an electrochemical device, including a battery cell and a protective circuit board. The battery cell includes a battery cell housing and electrode terminals partially disposed within the battery cell housing. The electrode terminals extend out of the battery cell housing and are bent in a first direction to form a bent portion and an extension portion. The extension portion is connected to the bent portion and extends along the first direction. Along a third direction, the width of the extension portion is smaller than the width of the bent portion, and at least one edge of the extension portion forms at least one clearance notch with at least one edge of the bent portion. The first direction is the thickness direction of the battery cell housing. The protective circuit board is located on one side of the battery cell housing along a second direction. The protective circuit board includes a first circuit board and a circuit functional module. The first circuit board includes a first surface and a second surface disposed opposite each other along the second direction. Both the extension portion and the circuit functional module are connected to the first surface. Along a third direction, the circuit functional module is at least partially located within the clearance notch. The first direction, the second direction, and the third direction are perpendicular to each other.
[0005] This application provides a clearance notch at the edge of the electrode terminal and places the circuit functional module at least partially within the clearance notch along the third direction, so that the circuit functional module and the electrode terminal share space in the third direction. This is beneficial to reducing the space occupied by the electrochemical device in the third direction and improving the energy density of the electrochemical device.
[0006] Based on the first aspect, in some embodiments, along the second direction, the first surface faces the battery cell and the second surface faces away from the battery cell. This arrangement facilitates the connection between the electrode terminals and the first circuit board.
[0007] Based on the first aspect, in some embodiments, the electrochemical device further includes a conductive element comprising a first conductive portion and a second conductive portion connected together. The first conductive portion is connected to a first surface, and the second conductive portion is folded toward the first conductive portion and connected to an extension. By folding the second conductive portion toward the first conductive portion, the space occupied by the connected first circuit board, electrode terminals, and conductive element in the second direction can be reduced, which is beneficial to improving the energy density of the electrochemical device.
[0008] Based on the first aspect, in some embodiments, along a third direction, the width of the first conductive portion is smaller than the width of the second conductive portion. By setting the width of the first conductive portion to be smaller than the width of the second conductive portion, the soldering connection space between the conductive component and the first circuit board can be reduced, thereby increasing the component layout space of the first circuit board, which is beneficial to reducing the size of the first circuit board in the third direction.
[0009] Based on the first aspect, in some embodiments, along a third direction, the width of the first conductive portion is W1, the width of the second conductive portion is W2, and the width of the bent portion is W3, where 2mm ≤ W1 ≤ (W3 + 2)mm and / or 2mm ≤ W2 ≤ (W3 + 2)mm. When the widths of the first conductive portion, the second conductive portion, and the bent portion are within the above ranges, it is possible to ensure that the first conductive portion has suitable dimensions to have sufficient connection strength with the first circuit board, while also minimizing the layout space occupied by the first conductive portion on the first circuit board, and ensuring that the second conductive portion has suitable dimensions to have sufficient connection strength with the electrode terminals.
[0010] Based on the first aspect, in some embodiments, the electrochemical device further includes a conductive element, which is flat and located between the extension and the first circuit board along the second direction. One side of the conductive element is connected to the first circuit board, and the other side of the conductive element is connected to the extension.
[0011] Based on the first aspect, in some embodiments, the extension is provided with solder joints, and the first circuit board is soldered to the solder joints, with the number of solder joints being 2-6. When the number of solder joints is within the above range, the extension has a suitable size, and under the premise of ensuring sufficient connection strength between the extension and the first circuit board, the size of the extension has a small impact on the energy density of the electrochemical device.
[0012] Based on the first aspect, in some embodiments, the width of the clearance notch is 1mm-5mm along the third direction. When the width of the clearance notch is within the above range, the clearance notch can accommodate a portion of the circuit functional module along the third direction, and the extension has suitable dimensions to have sufficient connection strength with the first circuit board.
[0013] Based on the first aspect, in some embodiments, the number of electrode terminals is two, and along a third direction, the clearance notch is located on the side of one of the two electrode terminals that is closer to the other electrode terminal, and the circuit functional module is a component.
[0014] Based on the first aspect, in some embodiments, the number of electrode terminals is two, the clearance notch is located on the side of one of the two electrode terminals away from the other electrode terminal, and the circuit function module is a second circuit board.
[0015] Based on the first aspect, in some embodiments, the first circuit board is a rigid printed circuit board and the second circuit board is a flexible printed circuit board.
[0016] A second aspect of this application provides an electrical device, including any of the aforementioned electrochemical devices. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of an electrochemical device provided in an embodiment of this application.
[0018] Figure 2 for Figure 1 A partial breakdown diagram of the electrochemical device is shown.
[0019] Figure 3 This is a schematic diagram of the battery cell before packaging, provided in an embodiment of this application.
[0020] Figure 4 for Figure 2 The diagram shows the protective circuit board and conductive components assembled together.
[0021] Figure 5 This is a schematic diagram of a battery cell provided in one embodiment of this application.
[0022] Figure 6 This is a schematic diagram of a battery cell provided in another embodiment of this application.
[0023] Figure 7 for Figure 1 The electrochemical device shown is a partial cross-sectional view along AA.
[0024] Figure 8 A schematic diagram of the protective circuit board and conductive components assembled according to another embodiment.
[0025] Figure 9 This is a schematic diagram of the protective circuit board and conductive components assembled according to another embodiment.
[0026] Figure 10 A partial cross-sectional view of an electrochemical device provided in an embodiment of this application.
[0027] Figure 11This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application.
[0028] Explanation of main component symbols
[0029] Electrochemical device 1 battery cells 100 Electrode assembly 10 Cell casing 20 Main body 21 Packaging Department 22 Receiving cavity 210 Protect circuit board 40 First circuit board 41 First surface 411 Second surface 412 Second circuit board 42 Components 43 electrode terminals 30 Bending section 31 extension 32 solder joint 321 Avoiding gaps 301 conductive components 50 Third Surface 501 Fourth surface 502 First conductive part 51 Second conductive part 52 Insulating components 60 Electrical equipment 2 First direction X Second direction Y Third direction Z Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0031] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "located" on another component, it can be directly located on the other component or may also have an intervening component.
[0032] It is worth noting that when there is an "electrical connection" between two components or parts, electrical conduction can be achieved through methods such as direct contact, welding, or adhesive bonding. The term "and / or" includes any and all combinations of one or more of the related listed items.
[0033] The term "perpendicular" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular. For example, in numerical terms, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is straight or plane, the component can be considered a "straight line" or "plane".
[0034] It should be noted that when a parameter is greater than, equal to or less than a certain endpoint value, it should be understood that the endpoint value is allowed to have a tolerance of ±10%. For example, if A is greater than B by 10, it should be understood that it includes the case where A is greater than B by 9, as well as the case where A is greater than B by 11.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0036] Some embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0037] Please see Figure 1 , Figure 2 and Figure 3 This application provides an electrochemical device 1, which includes a battery cell 100 and a protection circuit board 40. The battery cell 100 includes an electrode assembly 10, a battery cell housing 20, and electrode terminals 30. The electrode assembly 10 is disposed within the battery cell housing 20, and the electrode terminals 30 are connected to the electrode assembly 10, extend from the battery cell housing 20, and are electrically connected to the protection circuit board 40. There are two electrode terminals 30, designated as a positive terminal and a negative terminal. In another embodiment, the number of electrode terminals may be greater than two; this application does not impose a limitation.
[0038] The electrode assembly 10 is used to store chemical energy. The electrode assembly 10 is connected to a circuit via electrode terminals 30, and converts chemical energy into electrical energy through an internal chemical reaction. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrode. Optionally, the positive electrode, separator, and negative electrode are sequentially stacked and wound to form a wound structure; alternatively, the positive electrode, separator, and negative electrode are sequentially stacked to form a laminated structure.
[0039] In some embodiments, the cell housing 20 includes a main body 21 and an encapsulation portion 22. The main body 21 has a receiving cavity 210 for receiving the electrode assembly 10 and the electrode terminals 30. The encapsulation portion 22 extends from the main body 21 along at least one side away from the main body 21 and is used to seal the periphery of the receiving cavity 210. The encapsulation portion 22 is the portion of the cell housing 20 that is sealed by processes such as hot pressing or bonding after the electrode assembly 10 has been received. Optionally, the cell housing 20 may be made of a flexible encapsulation film (e.g., aluminum-plastic film, steel-plastic film) or a rigid plastic housing. In another embodiment, the cell housing 20 is a metal housing.
[0040] Please see Figure 1 and Figure 2The protection circuit board 40 is located on one side of the cell housing 20 along the second direction Y. The second direction Y is perpendicular to the first direction X, which is the thickness direction of the cell housing 20. The protection circuit board 40 includes a first circuit board 41 and a circuit function module connected to the first circuit board 41. The circuit function module is used to implement various functions of the first circuit board 41, such as circuit protection, power connection, data processing, and information storage and tracking. The first circuit board 41 includes a first surface 411 and a second surface 412 disposed opposite to each other along the second direction Y. The circuit function module and the electrode terminal 30 are both connected to the first surface 411. In some embodiments, along the second direction Y, the first surface 411 faces the cell 100, and the second surface 412 faces away from the cell 100. This arrangement facilitates the connection between the electrode terminal 30 and the first circuit board 41.
[0041] In some embodiments, the circuit functional module includes a second circuit board 42 and components 43. The second circuit board 42 is provided with a connector 44 for connecting an external power supply or device to the first circuit board 41 via the second circuit board 42. Components 43 may include protection ICs, resistors, capacitors, sensors, MOSFETs, fuses, and anti-counterfeiting ICs, etc., and all components 43 are connected to the first surface 411. Placing components 43 only on one side of the first circuit board 41 in the second direction Y helps to reduce the space occupied by the protection circuit board 40 in the second direction Y, thereby helping to improve the energy density of the electrochemical device 1.
[0042] In some embodiments, the first circuit board 41 is a rigid printed circuit board. A rigid circuit board refers to a rigid board made of a substrate such as a glass fiber copper-clad laminate, which cannot be bent or flexed, has a certain mechanical strength, and can play a supporting role to support components 43, etc.
[0043] In some embodiments, the second circuit board 42 is a flexible circuit board. A flexible circuit board is a circuit board constructed by printing or attaching functional components such as wires and thin lines onto a flexible substrate, such as a flexible polyimide film or polyester film. Flexible circuit boards are thinner, and using a flexible circuit board as the second circuit board 42 helps reduce the space occupied by the protective circuit board 40 in the second direction; furthermore, the flexibility of the circuit board facilitates the connection of the connector 44 on the second circuit board 42 to an external power source. The second circuit board 42 can also be a rigid printed circuit board.
[0044] Please see Figure 2The electrode terminal 30 includes a bent portion 31 and an extension portion 32 located outside the cell housing 20 and connected to each other. The extension portion 32 extends along a first direction X and connects to a first surface 411. The bent portion 31 extends from the edge of the cell housing 20 and connects to the extension portion 32. The bent portion 31 and the extension portion 32 can be formed by bending a portion of the electrode terminal 30 extending out of the cell housing 20 in the first direction X. Along the third direction Z, the width of the extension portion 32 is smaller than the width of the bent portion 31. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Along the third direction Z, at least one clearance notch 301 is formed between at least one edge of the extension portion 32 and at least one edge of the bent portion 31, and the circuit functional module is at least partially located in the clearance notch 301. By providing the clearance notch 301 and making the circuit functional module at least partially located in the clearance notch 301 along the third direction Z, the circuit functional module and the electrode terminal 30 share space in the third direction Z, which helps to reduce the space occupied by the electrochemical device 1 in the third direction Z and improve the energy density of the electrochemical device 1.
[0045] Please see Figure 2 and Figure 4 There are two second circuit boards 42, and the component 43 is located between the two second circuit boards 42 along the third direction Z. Along the third direction Z, in the direction where one electrode terminal 30 is farther from the other electrode terminal 30, in each electrode terminal 30, the edge of the extension 32 is recessed into the edge of the bend 31, so that the width of the extension 32 is less than the width of the bend 31, and the clearance notch 301 is located on the side of one electrode terminal 30 farther from the other electrode terminal 30. The circuit functional module is the second circuit board 42, and along the third direction Z, a portion of the second circuit board 42 is located within the clearance notch 301.
[0046] In some embodiments, please refer to Figure 4 and Figure 5 Along the third direction Z, in the direction from one electrode terminal 30 to the other, in each electrode terminal 30, the edge of the extension 32 is recessed into the edge of the bend 31, such that the width of the extension 32 is less than the width of the bend 31, and the clearance notch 301 is located on the side of one electrode terminal 30 closer to the other electrode terminal 30. The circuit functional module is component 43, and at least a portion of component 43 is located in the clearance notch 301 along the third direction Z. In another embodiment, only in one electrode terminal 30, the width of the extension 32 is less than the width of the bend 31 to form the clearance notch 301, that is, the clearance notch 301 is only provided on one electrode terminal 30.
[0047] In some embodiments, please refer to Figure 4 and Figure 6Along the third direction Z, in each electrode terminal 30, the two opposite edges of the bent portion 31 extend beyond the two opposite edges of the extension portion 32, such that the width of the extension portion 32 is less than the width of the bent portion 31, and the clearance notch 301 is located on both sides of the electrode terminal 30. Along the third direction Z, at least a portion of the component 43 is located in one clearance notch 301, and at least a portion of the second circuit board 42 is located in another clearance notch 301.
[0048] In some embodiments, please refer to Figure 2 and Figure 7 The electrochemical device 1 includes a conductive element 50, which connects a first circuit board 41 and an extension 32. The first circuit board 41 and the extension 32 of the electrode terminal 30 are located on the same side of the conductive element 50. Specifically, the conductive element 50 includes opposing third surfaces 501 and fourth surfaces 502, with both the first circuit board 41 and the extension 32 connected to the third surface 501. The conductive element 50 includes a first conductive portion 51 and a second conductive portion 52 connected together. The third surface 501 of the first conductive portion 51 is connected to the first surface 411 of the first circuit board 41. The second conductive portion 52 is folded toward the first conductive portion 51 such that the fourth surface 502 of the first conductive portion 51 and a portion of the fourth surface 502 of the second conductive portion 52 are spaced apart by a certain distance in the second direction Y, and the fourth surface 502 of the second conductive portion 52 is connected to the extension 32. By folding the second conductive part 52 toward the first conductive part 51, the space occupied by the connected first circuit board 41, electrode terminal 30 and conductive element 50 in the second direction Y can be reduced, which is beneficial to improving the energy density of the electrochemical device 1.
[0049] In some embodiments, please refer to Figure 7 Along the second direction Y, the extension 32 is located between the first conductive part 51 and the second conductive part 52, so that the extension 32 and the conductive member 50 share space in the second direction Y, which helps to reduce the space occupied by the electrochemical device 1.
[0050] In some embodiments, please refer to Figure 7 The electrochemical device 1 includes an insulating member 60 located between the extension 32 and the first conductive portion 51 to insulate the extension 32 from the first conductive portion 51. The insulating member 60 may be connected to the first conductive portion 51 and / or the extension 32; this application is not limiting. The insulating member 60 may be aramid paper, DuPont paper, etc.
[0051] In some embodiments, please refer to Figure 2 and Figure 4Along the third direction Z, the width of the first conductive portion 51 is smaller than the width of the second conductive portion 52. By setting the width of the first conductive portion 51 to be smaller than the width of the second conductive portion 52, the connection space between the conductive component 50 and the first circuit board 41 can be reduced, thereby increasing the component layout space of the first circuit board 41, which is beneficial to reducing the size of the first circuit board 41 in the third direction Z; and the second conductive portion 52 has a larger size and connects with the extension portion 32, which can accommodate the tolerances caused by the connection process (such as soldering). In another embodiment, please refer to Figure 8 Along the third direction Z, the width of the first conductive part 51 is equal to the width of the second conductive part 52.
[0052] In some embodiments, please refer to Figure 4 and Figure 5 Along the third direction Z, the width of the first conductive part 51 is W1, the width of the second conductive part 52 is W2, and the width of the bent part 31 is W3, where 2mm ≤ W1 ≤ (W3 + 2)mm, and / or 2mm ≤ W2 ≤ (W3 + 2)mm. When the widths of the first conductive part 51, the second conductive part 52, and the bent part 31 are within the above ranges, it is possible to ensure that the first conductive part 51 has suitable dimensions to have sufficient connection strength with the first circuit board 41, while minimizing the layout space occupied by the first conductive part 51 on the first circuit board 41, and ensuring that the second conductive part 52 has suitable dimensions to have sufficient connection strength with the electrode terminal 30.
[0053] In some embodiments, the width of the clearance notch 301 along the third direction Z is 1mm-5mm. When the width of the clearance notch 301 is within the above range, the clearance notch 301 can accommodate a portion of the circuit functional module along the third direction Z, and the extension 32 has suitable dimensions to have sufficient connection strength with the conductive element 50.
[0054] In some embodiments, please refer to Figure 5 The extension 32 is provided with solder joints 321, to which the first circuit board 41 or conductive component 50 is soldered. The number of solder joints 321 is 2-6. It should be noted that the solder joints 321 cover the entire extension 32 while meeting the soldering process requirements. By limiting the number of solder joints 321, the size of the extension 32 can be limited. When the number of solder joints 321 is within the above range, the extension 32 has a suitable size, and while ensuring sufficient connection strength between the extension 32 and the first circuit board 41, the size of the extension 32 has a relatively small impact on the energy density of the electrochemical device 1.
[0055] In some embodiments, please refer to Figure 9 and Figure 10The conductive element 50 is flat, with one side connected to the first circuit board 41 and the other side connected to the extension 32 of the electrode terminal 30. Specifically, the third surface 501 of the conductive element 50 is connected to the first circuit board 41, and the fourth surface 502 of the conductive element 50 is connected to the extension 32 of the electrode terminal 30.
[0056] Please see Figure 11 One embodiment of this application also provides an electrical device 2, including any of the electrochemical devices 1 described above. The electrical device 2 of this application may be, but is not limited to, laptops, pen-based computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.
[0057] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.
Claims
1. An electrochemical device, characterized in that, include: A battery cell includes a battery cell housing and electrode terminals partially disposed within the battery cell housing. The electrode terminals extend out of the battery cell housing and are bent in a first direction to form a bent portion and an extension portion. The extension portion is connected to the bent portion and extends along the first direction. Along a third direction, the width of the extension portion is smaller than the width of the bent portion, and at least one clearance notch is formed between at least one edge of the extension portion and at least one edge of the bent portion. The first direction is the thickness direction of the battery cell housing. A protective circuit board is located on one side of the battery cell housing along a second direction. The protective circuit board includes a first circuit board and a circuit function module. The first circuit board includes a first surface and a second surface disposed opposite to each other along the second direction. The extension and the circuit function module are both connected to the first surface. Along the third direction, the circuit function module is at least partially located in the clearance notch. The first direction, the second direction, and the third direction are perpendicular to each other.
2. The electrochemical device as described in claim 1, characterized in that, Along the second direction, the first surface faces the battery cell, and the second surface faces away from the battery cell.
3. The electrochemical device as described in claim 1, characterized in that, The electrochemical device further includes a conductive element, which includes a first conductive portion and a second conductive portion connected to each other. The first conductive portion is connected to the first surface, and the second conductive portion is folded toward the first conductive portion and connected to the extension portion.
4. The electrochemical device as described in claim 3, characterized in that, Along the third direction, the width of the first conductive part is smaller than the width of the second conductive part.
5. The electrochemical device of claim 3, wherein Along the third direction, the width of the first conductive part is W1, the width of the second conductive part is W2, and the width of the bent part is W3, where 2mm≤W1≤(W3+2)mm and / or 2mm≤W2≤(W3+2)mm.
6. The electrochemical device as claimed in claim 1, characterized in that, The electrochemical device further includes a conductive element, which is flat and located between the extension and the first circuit board along the second direction. One side of the conductive element is connected to the first circuit board, and the other side of the conductive element is connected to the extension.
7. The electrochemical device of claim 1, wherein, The extension is provided with solder joints, and the first circuit board is soldered to the solder joints, the number of which is 2-6.
8. The electrochemical device of claim 1, wherein, Along the third direction, the width of the clearance gap is 1mm-5mm.
9. The electrochemical device of claim 1, wherein, The number of electrode terminals is two. Along the third direction, the clearance notch is located on the side of one of the two electrode terminals that is closer to the other electrode terminal. The circuit functional module is a component.
10. The electrochemical device as claimed in claim 1, characterized in that, The number of electrode terminals is two, and the clearance notch is located on the side of one of the two electrode terminals away from the other electrode terminal. The circuit functional module is a second circuit board.
11. The electrochemical device as claimed in claim 10, characterized in that, The first circuit board is a rigid printed circuit board, and the second circuit board is a flexible printed circuit board.
12. An electrical device, characterized by Includes the electrochemical device as described in any one of claims 1 to 11.