Battery protection plate, battery and electronic device

Abstract

The utility model relates to battery protection board technical field discloses a kind of battery protection board, battery and electronic equipment, battery protection board includes: PCB, PCB is used to connect with battery core;Output soft board, output soft board is set to one side of PCB, multiple connectors are equipped on output soft board, and multiple connectors are used to connect with external equipment mainboard. By setting single output soft board, and setting multiple connectors on output soft board, the number of connecting points of output soft board and PCB is reduced, the contact resistance superposition effect caused by too many connecting points is reduced, the contact impedance is reduced, the temperature rise is reduced, the greater current flow is realized, and multiple connectors are installed on the same output soft board, the number of connecting soft board and assembly process can be reduced, and cost reduction is realized.

Description

Technical Field

[0001] This utility model relates to the field of battery protection board technology, specifically to battery protection boards, batteries, and electronic devices. Background Technology

[0002] With the rapid advancement of fast charging technology for mobile phones and the continuous improvement of lithium battery technology in mobile phones and digital products, users' demands for charging speed are becoming increasingly stringent, which places higher requirements on the charging performance of lithium battery protection boards. However, the development of existing battery protection boards faces many bottlenecks, seriously hindering further breakthroughs in fast charging technology. On the one hand, the charging performance of existing battery protection boards is limited by size and space, making further improvements difficult. On the other hand, the cost of fast-charging protection boards is also rising, putting pressure on the market promotion of these products. Specifically, in the field of fast-charging mobile phone batteries, protection boards often adopt a multi-terminal flexible circuit board structure to meet the demands of fast charging. This structure not only requires more materials, leading to increased material costs, but also has a complex manufacturing process, further increasing the overall cost. More importantly, the multi-terminal flexible circuit board structure suffers from high contact resistance and low current carrying capacity, which significantly limits the improvement of charging efficiency and fails to fully realize the potential of fast charging technology. On the other hand, current battery structures with single-sided wiring cannot achieve high-current fast charging due to limitations in connector technology. Although single-sided wiring structures have certain advantages in terms of space utilization, the connectors they are equipped with cannot meet the requirements of high-current fast charging in terms of current carrying capacity, which greatly restricts the application of this type of battery in fast charging scenarios. In summary, existing lithium batteries for mobile phones and digital products have significant shortcomings in terms of protection board structural design, cost control, and high-current fast charging compatibility. A new technical solution is urgently needed to address these issues and promote the better application of fast charging technology in related products. Utility Model Content

[0003] In view of this, the present invention provides a battery protection board, a battery, and an electronic device to solve the problems of increased cost and high contact resistance caused by multiple flexible circuit boards in the prior art.

[0004] In a first aspect, this utility model provides a battery protection board, comprising: a PCB for connecting to a battery cell; and an output flexible board disposed on one side of the PCB, wherein the output flexible board is provided with multiple connectors for connecting to an external device motherboard.

[0005] By setting up a single output flexible board and multiple connectors on it, the number of connection points between the output flexible board and the PCB is reduced, thus reducing the contact resistance superposition effect caused by too many connection points, reducing contact impedance, reducing temperature rise, and achieving greater current carrying capacity. At the same time, installing multiple connectors on the same output flexible board can reduce the number of connection boards and assembly processes, thereby reducing costs.

[0006] In one alternative embodiment, multiple connectors are arranged in parallel to form multiple parallel current transmission paths, reducing contact impedance.

[0007] In one alternative embodiment, the multiple connectors include a positive connector and a negative connector, which are symmetrically arranged on the output flexible board to avoid current distribution imbalance caused by different path lengths and ensure the balance of positive and negative current transmission.

[0008] In one alternative embodiment, the output flexible board is disposed at one end of the PCB along its length, thus avoiding the occupation of surrounding space when the output flexible board extends to the sides or middle of the PCB.

[0009] In one optional embodiment, the output flexible circuit board includes: a first flexible circuit board, which is soldered to a PCB; and a second flexible circuit board, which is connected to the first flexible circuit board. The second flexible circuit board is provided with multiple connectors to adapt to different motherboard designs and snap-fit ​​positions.

[0010] In one alternative embodiment, the first flexible board is bent along the thickness direction of the PCB, one end of the first flexible board is soldered to one side of the PCB, and the other end of the first flexible board is folded to the other side of the PCB, thereby reducing the space occupied by the flexible board in the PCB plane direction.

[0011] In one alternative embodiment, one end of the second flexible board is connected to the first flexible board, and the extension direction of the other end of the second flexible board can be varied so that its direction can be flexibly adjusted according to the interface position of the external device motherboard.

[0012] In one optional embodiment, the PCB is provided with multiple protection devices to protect the battery protection board, prevent the battery from being damaged due to its own or external abnormalities, and ensure the stable operation of the circuit.

[0013] Secondly, this utility model also provides a battery, comprising: a battery cell; and a battery protection board connected to the battery cell, wherein the battery protection board is the aforementioned battery protection board. Since the battery includes a battery protection board and has the same effect as a battery protection board, it will not be described further here.

[0014] Thirdly, this utility model also provides an electronic device, including the aforementioned battery. Since the electronic device includes a battery and has the same effects as a battery, further details will not be provided here. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a front view of a battery protection board according to an embodiment of the present utility model; Figure 2 This is an exploded structural diagram of a battery protection board according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of a battery according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the exploded structure of a battery according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 10. PCB; 20. Output FPC; 21. First FPC; 22. Second FPC; 30. Connectors; 100. Battery cells. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0022] When a battery protection board uses multiple flexible circuit boards (FTPCBs) with each FTPCB having its own connector, its contact resistance increases and its current-carrying capacity is limited, as detailed below: From the perspective of contact resistance composition, this structure contains multiple contact interfaces, including the soldering points between the flexible circuit board and the battery tabs, the connection points between the connector pins and the flexible circuit board, and the mating points between the connector and external devices. Each contact interface is affected by material properties, processing precision (such as solder flatness and pin insertion tightness), and oxidation level, resulting in independent contact resistance. The design of multiple flexible circuit boards and connectors multiplies the number of contact points, and the total contact impedance is the sum of the contact resistances of each interface (because the impedances of each contact point cannot be completely consistent, the actual total impedance is not an ideal parallel relationship), leading to a significant increase in overall impedance. Analysis of current transmission characteristics reveals that impedance differences among flexible circuit boards and connectors disrupt the balance of current distribution. Because parameters such as material uniformity, path length, and contact pressure are difficult to perfectly match, impedance deviations exist between different branches. This causes current to concentrate on paths with lower impedance during transmission, resulting in overload of some connectors, while branches with higher impedance bear less current. This non-uniform distribution limits the system's effective current-carrying capacity to the branch with the highest impedance, preventing coordinated current carrying across all paths and ultimately leading to a decrease in overall current-carrying capacity. In summary, the structure of multiple flexible boards and multiple connectors increases the total contact impedance by increasing the number of contact interfaces, and the uneven impedance disrupts the balance of current distribution, thus limiting the current carrying capacity.

[0023] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0024] According to an embodiment of the present invention, a battery protection board is provided, comprising: a PCB10 for connecting to a battery cell; and an output flexible board 20 disposed on one side of the PCB10, wherein the output flexible board 20 is provided with a plurality of connectors 30 for connecting to an external device motherboard.

[0025] In this embodiment, by setting a single output flexible board 20 and setting multiple connectors 30 on the output flexible board 20, the number of connection points between the output flexible board 20 and the PCB 10 is reduced, the contact resistance superposition effect caused by too many connection points is reduced, the contact impedance is reduced, the temperature rise is reduced, and a larger current carrying capacity is achieved. At the same time, the installation of multiple connectors 30 on the same output flexible board 20 can reduce the number of connection flexible boards and assembly process, thereby reducing costs.

[0026] The aforementioned PCB (printed circuit board) is a core carrier that has conductive lines pre-printed on an insulating substrate to fix and connect electronic components such as chips, resistors, and capacitors. It connects various parts of electronic components and devices through circuits.

[0027] like Figure 1 , Figure 2 As shown, the number of connectors 30 is two. In other embodiments, the number of connectors 30 is not limited to this, and may also be three, four, etc.

[0028] In one embodiment, multiple connectors 30 are arranged in parallel.

[0029] The parallel connectors 30 form multiple parallel current transmission paths, and the total current carrying capacity is the sum of the rated current carrying capacity of each connector 30. For example, after three connectors with a rated current carrying capacity of 5A are connected in parallel, the theoretical total current carrying capacity can reach 15A, which can meet the high current requirements of fast charging scenarios. At the same time, the current is evenly distributed among the connectors 30, and the load pressure on the individual connectors 30 is greatly reduced, which can avoid heat generation and aging caused by local current overload and extend the service life of the connectors.

[0030] Connecting multiple connectors in parallel (30 in total) is equivalent to connecting multiple contact resistors in parallel. According to the characteristics of parallel resistance, the total contact impedance decreases as the number of connectors in parallel increases. For example, connecting two connectors with impedance R in parallel reduces the total impedance to R / 2, reducing energy loss (Joule heating) during current transmission and improving charging efficiency. Furthermore, the parallel structure reduces the impact of impedance fluctuations at individual contact points on the total impedance, making the overall impedance more stable.

[0031] In one embodiment, the plurality of connectors 30 include a positive connector and a negative connector, which are symmetrically arranged on the output flexible circuit board 20. The symmetrical arrangement of the positive and negative connectors makes the path lengths of the current flowing from the positive terminal to the negative terminal more similar, reducing impedance differences between different paths. This symmetrical design avoids current distribution imbalances caused by varying path lengths, ensuring balanced current transmission between the positive and negative terminals, thereby reducing overall loop impedance, reducing energy loss, and improving fast charging efficiency. The symmetrical arrangement also ensures more even stress distribution on the output flexible circuit board 20 when connected to the PCB 10 and external devices, reducing the risk of deformation or solder joint detachment due to excessive stress on one side, and improving the overall mechanical stability of the structure.

[0032] In one embodiment, the output flexible board 20 is disposed at one end of the length direction of the PCB 10.

[0033] Placing the output flexible circuit board 20 at one end of the PCB 10's length avoids the space it occupies when extending to the sides or center of the PCB 10, making it particularly suitable for scenarios with narrow internal spaces, such as mobile phones and digital products. This design allows for a more compact layout of components such as the battery protection board, battery cells, and device housing, reducing overall volume redundancy and providing favorable conditions for miniaturization and thinning of the battery system. Simultaneously, the centralized layout of the flexible circuit board at one end facilitates correspondence with the interface area of ​​the external device's motherboard, simplifying the internal wiring planning of the device.

[0034] In one embodiment, the output flexible board 20 includes: a first flexible board 21, which is soldered to the PCB 10; and a second flexible board 22, which is connected to the first flexible board 21, and a plurality of connectors 30 are provided on the second flexible board 22.

[0035] Specifically, the first flexible board 21 is laser-welded to the PCB 10. The first flexible board 21 can flexibly adjust its orientation (such as bending or folding) according to the relative position of the PCB 10 and the external device. The second flexible board 22 can independently optimize the arrangement angle and position of the connector 30. The segmented arrangement of the first flexible board 21 and the second flexible board 22 enables the output flexible board 20 to adapt to the narrow and irregular space inside the device, avoid obstacles such as battery cells and housings, and ensure that the connector 30 is accurately connected to the motherboard of the external device.

[0036] In one embodiment, the first flexible board 21 is bent along the thickness direction of the PCB 10, one end of the first flexible board 21 is soldered to one side of the PCB 10, and the other end of the first flexible board 21 is folded to the other side of the PCB 10.

[0037] Specifically, the design of bending along the thickness direction changes the layout of the first flexible circuit board 21 from a planar extension to a three-dimensional fold, reducing the space occupied by the flexible circuit board in the planar direction of PCB10. After the first flexible circuit board 21 is folded to the other side of PCB10, the starting position of the second flexible circuit board 22 can be closer to the interface direction of the external device motherboard, reducing the bending amplitude and length of the second flexible circuit board.

[0038] In one embodiment, one end of the second flexible board 22 is connected to the first flexible board 21, and the extension direction of the other end of the second flexible board 22 can be varied.

[0039] Specifically, the adjustable extension direction of the second flexible circuit board 22 allows it to flexibly adjust its orientation (e.g., extending left, right, upward, or downward) according to the interface position of the external device's motherboard, eliminating the need to redesign the overall structure due to differences in device models. For example, the relative positions of the motherboard and battery may differ in mobile phones of different brands. By adjusting the extension direction of the second flexible circuit board 22, it can be ensured that its multiple connectors 30 always precisely mate with the motherboard interface, significantly improving the versatility of the battery protection board.

[0040] In one embodiment, the PCB10 is provided with multiple protection devices to protect the battery protection board, prevent the battery from being damaged due to its own or external abnormalities, and ensure the stable operation of the circuit.

[0041] The protection devices include: Metal-Oxide-Semiconductor Field-Effect Transistor (MOS transistor), fuses, resistive protection components (e.g., current sensing resistors, current limiting resistors), and voltage regulation / overvoltage protection components (e.g., Zener diodes, Transient Voltage Suppressor Diodes (TVS diodes).

[0042] like Figure 3 , Figure 4As shown, according to an embodiment of the present invention, another aspect provides a battery, including: a battery cell 100; and a battery protection board connected to the battery cell 100. The battery protection board is the same as the battery protection board described in the above embodiment. By setting a single output flexible board 20 and providing multiple connectors 30 on the output flexible board 20, the number of connection points between the output flexible board 20 and the PCB 10 is reduced, the contact resistance superposition effect caused by too many connection points is reduced, contact impedance is reduced, temperature rise is reduced, and a larger current carrying capacity is achieved. At the same time, the installation of multiple connectors 30 on the same output flexible board 20 can reduce the number of connection flexible boards and assembly processes, thereby reducing costs.

[0043] According to an embodiment of the present invention, another aspect provides an electronic device including the battery described in the above embodiment. By setting a single output flexible circuit board 20 and providing multiple connectors 30 on the output flexible circuit board 20, the number of connection points between the output flexible circuit board 20 and the PCB 10 is reduced, the contact resistance superposition effect caused by too many connection points is reduced, contact impedance is reduced, temperature rise is reduced, and a larger current carrying capacity is achieved. At the same time, the installation of multiple connectors 30 on the same output flexible circuit board 20 can reduce the number of connection flexible circuit boards and assembly processes, thereby reducing costs.

[0044] This utility model has the following technical effects: (1) Single-sided connection of flexible board reduces the amount of material, reduces assembly process, and lowers cost compared to existing technologies.

[0045] (2) A single-side board with multiple connectors can reduce connection impedance, reduce fast charging temperature rise, and increase fast charging power.

[0046] (3) Multiple connectors on a single side panel can expand the connection area and improve heat dissipation during fast charging.

[0047] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0048] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0049] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery protection plate, characterized in that, include: PCB (10), the PCB (10) being used to connect to the battery cell; Output flexible board (20) is disposed on one side of the PCB (10). The output flexible board (20) is provided with multiple connectors (30), which are used to connect to the motherboard of an external device.

2. The battery protection plate of claim 1, wherein, Multiple connectors (30) are arranged in parallel.

3. The battery protection plate according to claim 1 or 2, characterized in that, The plurality of connectors (30) include a positive connector and a negative connector, which are symmetrically arranged on the output flexible board (20).

4. The battery protection plate of claim 1, wherein, The output flexible board (20) is disposed at one end of the PCB (10) along its length.

5. The battery protection plate of claim 1, wherein, The output flexible board (20) includes: The first flexible board (21) is soldered to the PCB (10); The second flexible board (22) is connected to the first flexible board (21), and the second flexible board (22) is provided with a plurality of the connectors (30).

6. The battery protection plate of claim 5, wherein, The first flexible board (21) is bent along the thickness direction of the PCB (10), one end of the first flexible board (21) is soldered to one side of the PCB (10), and the other end of the first flexible board (21) is folded to the other side of the PCB (10).

7. The battery protection plate of claim 5, wherein, One end of the second flexible board (22) is connected to the first flexible board (21), and the extension direction of the other end of the second flexible board (22) can be varied.

8. The battery protection plate of claim 1, wherein, The PCB (10) is equipped with multiple protection devices.

9. A battery, characterized by include: Battery cell (100); A battery protection board, which is connected to the battery cell (100), wherein the battery protection board is the battery protection board according to any one of claims 1-8.

10. An electronic device, characterized in that, Includes the battery as described in claim 9.

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