Protective circuit board, battery assembly and electronic equipment

Abstract

The utility model relates to a protection circuit board, a battery assembly and electronic equipment, the protection circuit board comprises a circuit board body and a connecting piece, the circuit board body comprises a first surface and a second surface which are opposite to each other, and a battery protection device is arranged on the first surface; and the connecting piece is connected to the first surface and is used for being connected with a tab of the battery. Therefore, the additional thickness caused by the arrangement of the connecting piece on the other surface of the circuit board body is reduced, so that the thickness of the protection circuit board is effectively reduced, and the thinning design of the battery assembly and the electronic equipment is further facilitated. In addition, the above arrangement does not change the overall structural strength of the protection circuit board, so that the reliability of the battery assembly is improved while the thinning is realized.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic equipment, and in particular to a protective circuit board, a battery assembly, and an electronic device. Background Art

[0002] With the continuous advancement of technology, electronic devices such as mobile phones are becoming increasingly lightweight and thinner. As a key component of electronic devices, the lightweight and thin design of battery assemblies plays a significant role in reducing the thickness of electronic devices. However, existing battery assembly thinning solutions cannot simultaneously balance the thinning effect and battery assembly reliability. Utility Model Content

[0003] To overcome the problems existing in the related art, the present disclosure provides a protective circuit board, a battery assembly and an electronic device.

[0004] According to a first aspect of the present disclosure, a protection circuit board is provided, comprising: a circuit board body, the circuit board body comprising a first surface and a second surface opposite to each other, a battery protection device being provided on the first surface; and a connector connected to the first surface, the connector being used to connect to a tab of a battery.

[0005] In some embodiments of the present disclosure, the connecting member includes a sheet structure, which includes a first part and a second part that are connected. The first part is fitted and connected to the first surface, and the second part forms an angle with the first surface by bending. The second part is used to connect to the tab.

[0006] In some embodiments of the present disclosure, an encapsulation layer is provided on the first surface, the encapsulation layer covers the battery protection device, and the encapsulation layer is provided with an opening corresponding to the position of the connector to connect the connector to the first surface.

[0007] In some embodiments of the present disclosure, along the extension direction of the circuit board body, the width of the opening is greater than the width of the connecting member.

[0008] In some embodiments of the present disclosure, along the extension direction of the circuit board body, the width of the opening is 6.5 mm to 7.5 mm, and the width of the connecting member is 5.5 mm to 6.5 mm.

[0009] In some embodiments of the present disclosure, the protective circuit board further includes: a reinforcing member connected to the first surface corresponding to the opening position, and the connecting member is connected to the reinforcing member.

[0010] In some embodiments of the present disclosure, the reinforcing member includes a plate-like structure, the plate-like structure includes a third surface and a fourth surface facing each other, the third surface is fitly connected to the first surface, and the connecting member is connected to the fourth surface.

[0011] In some embodiments of the present disclosure, two ends of the reinforcing piece extend along the extension direction of the circuit board body to form a first extension portion and a second extension portion, respectively, and the packaging layer covers the first extension portion and the second extension portion.

[0012] In some embodiments of the present disclosure, the protection circuit board further includes a limiting portion provided on the first extension portion and / or the second extension portion, and the packaging layer covers the limiting portion.

[0013] In some embodiments of the present disclosure, a protruding structure is provided on the third surface of the reinforcing member at a position corresponding to the first extending portion and / or the second extending portion, and the protruding structure constitutes the limiting portion.

[0014] In some embodiments of the present disclosure, the circuit board body includes two layers of rigid circuit boards and at least one layer of flexible circuit board sandwiched between the two layers of rigid circuit boards, and the connector is connected to the rigid circuit boards located on the first surface.

[0015] According to a second aspect of the present disclosure, a battery assembly is provided, comprising a battery cell, a tab connected to the battery cell, and the protection circuit board as described in the first aspect, wherein a connector of the protection circuit board is connected to the tab.

[0016] According to a third aspect of the present disclosure, an electronic device is provided, comprising the battery assembly according to the second aspect.

[0017] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0018] The protective circuit board provided by the present disclosure arranges the battery protection device and connector on the same surface of the circuit board body, reducing the additional thickness that would be added if the connector were arranged on another surface of the circuit board body. This effectively reduces the thickness of the protective circuit board, thereby facilitating the thinning design of battery assemblies and electronic devices. Furthermore, this arrangement does not alter the overall structural strength of the protective circuit board, thereby achieving both thinness and improved reliability of the battery assembly.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] Figure 1 is a schematic structural diagram of a protection circuit board at a first viewing angle according to an exemplary embodiment;

[0022] Figure 2 is a schematic structural diagram of a protection circuit board at a second viewing angle according to an exemplary embodiment;

[0023] Figure 3 is a cross-sectional view of a protection circuit board according to an exemplary embodiment.

[0024] In the picture:

[0025] 1-protective circuit board; 11-circuit board body; 111-first surface; 112-second surface; 12-connector; 121-first part; 122-second part; 13-packaging layer; 131-opening; 14-reinforcement member; 141-third surface; 142-fourth surface; 143-first extension portion; 144-second extension portion; 15-raised structure. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0027] With the continuous advancement of science and technology, electronic devices such as mobile phones are gradually developing in the direction of being lighter and thinner. As one of the important components of electronic devices, the lightweight and thin design of battery components plays an important role in the thinning of electronic devices. However, the thinning solutions for battery components in related technologies cannot take into account both the thinning effect and the reliability of battery components. For example, the battery components in related technologies include battery cells and a protection circuit board connected to the battery cells. The thickness of the protection circuit board is a prerequisite for whether the battery component as a whole can be thinned. To this end, the following solutions are mainly used in related technologies to thin the protection circuit board.

[0028] Solution 1: Using a printed circuit board (PCB) as the protection circuit board, the thickness of the PCB is reduced by widening the PCB. However, widening the PCB takes up space in the battery cells, which reduces the cell capacity. Furthermore, when the PCB thickness is reduced to 0.6mm, the structural strength of the protection circuit board decreases sharply, reducing the reliability of the battery assembly. Therefore, this solution cannot achieve both the reduction in thickness and the reliability of the battery assembly.

[0029] Option 2: Replace the protective circuit board's PCB with a flexible printed circuit (FPC) combined with a reinforcement plate to reduce the thickness of the protective circuit board. However, due to the high impedance and temperature rise of the FPC, the board width must be increased to reduce impedance, which reduces the structural strength of the protective circuit board. Therefore, this solution cannot simultaneously achieve a thinning effect and ensure the reliability of the battery assembly.

[0030] Option three: Replace the PCB of the protection circuit board with an FPC and use a molding process for curing and reinforcement. However, due to the low hardness of the FPC, injection molding is difficult and has a low yield rate, resulting in lower reliability of the protection circuit board. Therefore, this solution cannot simultaneously achieve both thinning and battery assembly reliability.

[0031] Solution 4: By adding an FPC circuit board connected to the PCB, the battery protection device on the protection circuit board is placed on the FPC circuit board, thereby achieving external placement of the battery protection device and reducing the overall thickness of the protection circuit board. However, this solution will occupy additional space inside the electronic device, affecting the normal placement of other components within the electronic device, and is not conducive to the stacking design of the entire device, thus hindering the thinning design of electronic devices.

[0032] To address the above technical issues, the present disclosure provides a protective circuit board that arranges the battery protection device and connector on the same surface of the circuit board body, reducing the additional thickness that would be added if the connector were arranged on another surface of the circuit board body. This effectively reduces the thickness of the protective circuit board, thereby facilitating the thinning of battery assemblies and electronic devices. Furthermore, this arrangement does not alter the overall structural strength of the protective circuit board, thereby improving the reliability of the battery assembly while achieving thinness.

[0033] An exemplary embodiment of the present disclosure provides a protection circuit board, such as Figure 1As shown, the protection circuit board 1 includes a circuit board body 11 and a connector 12. The circuit board body 11 includes a first surface 111 and a second surface 112 opposite to each other. The circuit board body 11 can be, for example, a PCB circuit board or a laminated structure composed of a PCB circuit board and an FPC circuit board.

[0034] Battery protection devices, such as negative temperature coefficient thermistors, positive temperature coefficient thermistors, overcurrent protectors, integrated circuits, and MOSFETs, are provided on first surface 111. These devices are used to protect the battery cells 210 from overcharge, overdischarge, overcurrent, and short circuits. Connectors 12 are connected to first surface 111 and are used to connect to the battery tabs. Connectors 12 may be metal sheets, such as nickel or gold sheets.

[0035] By arranging the battery protection device and the connector 12 on the same surface (first surface 111) of the circuit board body 11, on the one hand, the additional thickness caused by the connector 12 being arranged on another surface of the circuit board body 11 is reduced, thereby effectively reducing the thickness of the protection circuit board 1, which is conducive to the thinning design of battery components and electronic devices. On the other hand, the above-mentioned arrangement does not change the overall structural strength of the protection circuit board 1, thereby achieving thinning while also helping to improve the reliability of the battery component. In addition, by reducing the thickness of the protection circuit board 1, it is beneficial to expand the cell capacity of the battery component, so that the battery component can meet higher power requirements and improve the user experience.

[0036] Combine Figure 2 In one embodiment, the connector 12 comprises a sheet-like structure comprising a first portion 121 and a second portion 122. The first portion 121 is attached to the first surface 111. For example, the first portion 121 can be attached to the first surface 111 by welding, bonding, or the like. The second portion 122 is bent to form an angle with the first surface 111. The angle can be, for example, 90°, 70°, or 60°, and can be controlled according to actual needs and is not specifically limited here. The second portion 122 is used to connect to the tab. This arrangement, on the one hand, facilitates the connection between the connector 12 and the tab, making the battery assembly structure more compact, thereby facilitating a thinner and more miniaturized battery assembly design. On the other hand, configuring the connector 12 as a sheet-like structure reduces the volume and weight of the connector 12 itself while ensuring a stable connection between the connector 12 and the tab, thereby facilitating a thinner and more lightweight battery assembly design.

[0037] Combine Figure 1In one embodiment, an encapsulation layer 13 is provided on the first surface 111, and the encapsulation layer 13 covers the battery protection device. Exemplarily, the encapsulation layer 13 can be formed, for example, by a system-in-package (SIP) process. With such a design, on the one hand, by providing the encapsulation layer 13, it can not only protect the battery protection device, but also reinforce the circuit board body 11, thereby effectively improving the overall structural strength of the protection circuit board 1 and improving the reliability of the battery assembly. On the other hand, the encapsulation layer 13 formed by the SIP process is conducive to reducing the temperature rise of the protection circuit board 1. According to tests, the temperature rise can be reduced by more than 10°C, thereby further improving the reliability of the battery assembly.

[0038] The encapsulation layer 13 is provided with an opening 131 at a position corresponding to the connector 12, so as to connect the connector 12 to the first surface 111. For example, when providing the opening 131 in the encapsulation layer 13, the first surface 111 of the circuit board body 11 can be fully injection molded using a SIP process, i.e., the encapsulation layer 13 can be formed on the first surface 111. Subsequently, laser decapsulation is performed to form the opening 131 at the position corresponding to the connector 12, thereby providing a soldering space for the connection between the connector 12 and the first surface 111.

[0039] Such a setting facilitates the connection between the connector 12 and the first surface 111. At the same time, while improving the overall structural strength of the protection circuit board 1, it reduces the additional thickness caused by the setting of the connector 12 on the second surface 112 of the circuit board body 11, thereby effectively reducing the thickness of the protection circuit board 1, which is beneficial to the thinning design of battery components and electronic devices.

[0040] Combine Figure 1 In one embodiment, the width of the opening 131 is greater than the width of the connector 12 along the extension direction of the circuit board body 11. This design, on the one hand, can improve the fit between the connector 12 and the first surface 111, thereby effectively improving the comprehensiveness and tightness of the connection between the connector 12 and the circuit board body 11, preventing the connector 12 from warping or the presence of voids between the connector 12 and the circuit board body 11, thereby facilitating improved reliability of the battery assembly. On the other hand, by making the width of the opening 131 greater than the width of the connector 12, sufficient operating space can be provided for the connector 12 to be connected to the first surface 111, thereby facilitating the assembly of the protection circuit board 1 and improving the yield rate of the protection circuit board 1.

[0041] In one embodiment, the width of the opening 131 along the extension direction of the circuit board body 11 is 6.5 mm to 7.5 mm, for example, 7 mm. The width of the connector 12 is 5.5 mm to 6.5 mm, for example, 6 mm. This ensures that sufficient operating space is provided for the connector 12 to connect to the first surface 111 to facilitate assembly of the protection circuit board 1. By controlling the width of the opening 131, it is avoided that the opening 131 is too wide and affects the structural strength of the protection circuit board 1, thereby further improving the reliability of the battery assembly.

[0042] Since there is no packaging layer 13 between the connector 12 and the edge of the opening 131, the structural strength of the circuit board body 11 in this area is lower than that in the position where the packaging layer 13 or the connector 12 is provided. In order to prevent this area from affecting the reliability of the protection circuit board 1, the following steps are combined: Figure 1 In one embodiment, the protective circuit board 1 further includes a reinforcing member 14. The reinforcing member 14 can be, for example, a nickel structural member, a PCB circuit board, a gold structural member, etc., as long as it can play a reinforcing role, and there is no specific limitation on this.

[0043] Reinforcement member 14 is connected to first surface 111 at a position corresponding to opening 131, and connector 12 is connected to reinforcement member 14. For example, reinforcement member 14 can be connected to first surface 111 by welding, bonding, or other methods, and connector 12 can also be connected to reinforcement member 14 by welding, bonding, or other methods. In this way, reinforcement member 14 enhances the structural strength between connector 12 and the edge of opening 131, thereby effectively improving the overall structural strength of protective circuit board 1.

[0044] In this embodiment, even with the reinforcement member 14, the overall thickness of the protection circuit board 1 is still significantly reduced compared to attaching the connector 12 to the second surface 112. Furthermore, the width of the protection circuit board 1 can be reduced. Testing has shown that the width of the protection circuit board 1 provided in this embodiment can be reduced to 3.2 mm, further increasing the battery capacity.

[0045] Combine Figure 1In one embodiment, the reinforcing member 14 comprises a plate-like structure including a third surface 141 and a fourth surface 142 facing each other. The third surface 141 is in contact with the first surface 111, and the connector 12 is connected to the fourth surface 142. This arrangement, on the one hand, can effectively improve the flatness of the protective circuit board 1, thereby facilitating assembly while also improving the yield rate of the protective circuit board 1, thereby improving the reliability of the battery assembly. On the other hand, by configuring the reinforcing member 14 as a plate-like structure, the thickness of the protective circuit board 1 can be reduced compared to an uneven structure, thereby facilitating a further thinning design of the battery assembly.

[0046] Combine Figure 3 In one embodiment, the two ends of the reinforcing member 14 extend along the extension direction of the circuit board body 11 to form a first extension portion 143 and a second extension portion 144, respectively. The encapsulation layer 13 covers the first extension portion 143 and the second extension portion 144. Specifically, the reinforcing member 14 is a long, strip-shaped structure. In the extension direction of the circuit board body 11, the length of the reinforcing member 14 is greater than the width of the opening 131. This allows the encapsulation layer 13 to cover both ends of the reinforcing member 14.

[0047] This design, on the one hand, effectively improves the connection stability between the reinforcing member 14 and the circuit board body 11 by encapsulating the reinforcing member 14 between the encapsulating layer 13 and the circuit board body 11, preventing the normal operation of the battery assembly from being affected by the falling of the reinforcing member 14, thereby improving the reliability of the protective circuit board 1 and the battery assembly. Furthermore, it not only improves the comprehensiveness of the reinforcement at the position of the opening 131, thereby further improving the reliability of the battery assembly, but also prevents the end of the reinforcing member 14 from being exposed, thereby improving the aesthetics of the protective circuit board 1.

[0048] Exemplarily, the reinforcing member 14 is a nickel-based structural member identical to the connector 12. After the third surface 141 of the reinforcing member 14 is welded to the circuit board, the circuit board body 11 is fully injection molded, forming an encapsulation layer 13 on the first surface 111. During this process, the reinforcing member 14 is entirely encapsulated between the encapsulation layer 13 and the circuit board body 11. Laser decapsulation is then performed to form an opening 131 corresponding to the location of the connector 12, exposing a portion of the fourth surface 142 of the reinforcing member 14. Finally, the connector 12 is welded to the fourth surface 142 of the reinforcing member 14. This facilitates the connection between the connector 12 and the reinforcing member 14 and effectively improves assembly efficiency. After decapsulation, laser cleaning and other steps can be added to ensure the flatness of the protective circuit board 1.

[0049] Combine Figure 3In one embodiment, the protection circuit board 1 further includes a limiting portion provided on the first extension portion 143 and / or the second extension portion 144. For example, the limiting portion may be provided only on the first extension portion 143, or only on the second extension portion 144, or on both the first extension portion 143 and the second extension portion 144. The limiting portion is provided on the surface of the first extension portion 143 and / or the second extension portion 144 facing the encapsulation layer 13, so that the encapsulation layer 13 covers the limiting portion. By adopting such a setting form, the bonding force between the limiting portion and the encapsulation layer 13 can be effectively improved, and the separation of the reinforcement 14 from the encapsulation layer 13 due to external force factors (such as bending force) can be avoided, thereby improving the connection stability between the reinforcement 14, the encapsulation layer 13 and the circuit board body 11, thereby further improving the overall reliability of the protection circuit board 1.

[0050] For example, the limiting portion can be an integral structure formed integrally with the reinforcement 14, or a separate structure connected by welding, bonding, etc., and the material of the limiting portion can be the same as or different from the material of the reinforcement 14. This is not specifically limited in this embodiment.

[0051] Combine Figure 1 and Figure 3 In one embodiment, a raised structure 15 is provided on the third surface 141 of the reinforcing member 14 at positions corresponding to the first extension portion 143 and / or the second extension portion 144. For example, the raised structure 15 may be provided only on the first extension portion 143, only on the second extension portion 144, or both on the first extension portion 143 and the second extension portion 144. The raised structure 15 constitutes a position-limiting portion. This design, on the one hand, simplifies the structure of the position-limiting portion and facilitates production and processing. On the other hand, by directly forming the raised structure 15 on the reinforcing member 14 to constitute the position-limiting portion, the stability of the connection between the raised structure 15 and the reinforcing member 14 can be effectively improved, thereby further enhancing the reliability of the battery assembly.

[0052] In one embodiment, the circuit board body 11 includes two layers of rigid circuit boards and at least one layer of flexible circuit board sandwiched between the two layers of rigid circuit boards, and the connector 12 is connected to the rigid circuit board located on the first surface 111. For example, only one layer of flexible circuit board can be arranged between the two layers of rigid circuit boards, or multiple layers of flexible circuit boards, such as 2 layers, 3 layers, etc., can be arranged between the two layers of rigid circuit boards. The rigid circuit board can be combined with the flexible circuit board through processes such as pressing and injection molding to form a rigid-flexible board. In this way, the thickness of the solder pad is saved, thereby ensuring the structural strength of the circuit board body 11 while reducing the thickness of the circuit board body 11, which is beneficial to the thinning design of the battery assembly. For example, after testing, the protective circuit board 1 of the embodiment of the present disclosure can achieve an ultra-thin design of less than 1 mm (0.4 mm circuit board body 11 + 0.52 mm packaging layer 13).

[0053] An exemplary embodiment of the present disclosure provides a battery assembly, which includes a battery cell, a tab connected to the battery cell, and the protection circuit board 1 as described above, Figure 1 The protection circuit board 1 includes a circuit board body 11 and a connector 12. The circuit board body 11 includes a first surface 111 and a second surface 112 opposite to each other. The battery protection device is provided on the first surface 111. The connector 12 is connected to the first surface 111 and is connected to the tab.

[0054] By arranging the battery protection device and the connector 12 on the same surface (first surface 111) of the circuit board body 11, on the one hand, the additional thickness caused by the connector 12 being arranged on another surface of the circuit board body 11 is reduced, thereby effectively reducing the thickness of the protection circuit board 1, which is conducive to the thinning design of battery components and electronic devices. On the other hand, the above-mentioned arrangement does not change the overall structural strength of the protection circuit board 1, thereby achieving thinning while also helping to improve the reliability of the battery component. In addition, by reducing the thickness of the protection circuit board 1, it is beneficial to expand the cell capacity of the battery component, so that the battery component can meet higher power requirements and improve the user experience.

[0055] An exemplary embodiment of the present disclosure provides an electronic device. By way of example, the electronic device may be a mobile device such as a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA). It may also be a non-mobile device such as a personal computer (PC), a television (TV), an ATM, or an kiosks.

[0056] The electronic device includes the battery assembly as described above. The battery assembly includes a battery cell, a tab connected to the battery cell, and a protective circuit board 1, combined with Figure 1 The protection circuit board 1 includes a circuit board body 11 and a connector 12. The circuit board body 11 includes a first surface 111 and a second surface 112 opposite to each other. The battery protection device is provided on the first surface 111. The connector 12 is connected to the first surface 111 and is connected to the tab.

[0057] By arranging the battery protection device and the connector 12 on the same surface (first surface 111) of the circuit board body 11, on the one hand, the additional thickness caused by the connector 12 being arranged on the other surface of the circuit board body 11 is reduced, thereby effectively reducing the thickness of the protection circuit board 1, which is beneficial to the thinning design of the battery assembly and the electronic device. On the other hand, the above-mentioned arrangement does not change the overall structural strength of the protection circuit board 1, thereby achieving thinning while also helping to improve the reliability of the battery assembly, that is, improving the reliability of the electronic device. In addition, by reducing the thickness of the protection circuit board 1, it is beneficial to expand the cell capacity of the battery assembly, so that the battery assembly can meet higher power requirements and improve the user experience.

[0058] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0059] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A protective circuit board, characterized in that: The protection circuit board comprises: A circuit board body, the circuit board body comprising a first surface and a second surface opposite to each other, wherein a battery protection device is provided on the first surface; A connector is connected to the first surface, and the connector is used to connect to the tab of the battery.

2. The protective circuit board according to claim 1, wherein: The connecting member includes a sheet structure, which includes a first part and a second part connected to each other. The first part is fitted and connected to the first surface, and the second part forms an angle with the first surface by bending. The second part is used to connect with the tab.

3. The protective circuit board according to claim 1, wherein: An encapsulation layer is provided on the first surface, the encapsulation layer covers the battery protection device, and the encapsulation layer is provided with an opening corresponding to the position of the connector, so that the connector is connected to the first surface.

4. The protective circuit board according to claim 3, wherein: Along the extension direction of the circuit board body, the width of the opening is greater than the width of the connecting member.

5. The protective circuit board according to claim 4, characterized in that: Along the extension direction of the circuit board body, the width of the opening is 6.5 mm to 7.5 mm, and the width of the connecting piece is 5.5 mm to 6.5 mm.

6. The protective circuit board according to claim 3, wherein: The protection circuit board also includes: A reinforcing piece is connected to the first surface corresponding to the opening position, and the connecting piece is connected to the reinforcing piece.

7. The protective circuit board according to claim 6, wherein: The reinforcing member includes a plate-like structure, the plate-like structure includes a third surface and a fourth surface opposite to each other, the third surface is fitted and connected to the first surface, and the connecting member is connected to the fourth surface.

8. The protective circuit board according to claim 6, wherein: Two ends of the reinforcing piece extend along the extension direction of the circuit board body to form a first extension portion and a second extension portion, respectively. The packaging layer covers the first extension portion and the second extension portion.

9. The protective circuit board according to claim 8, characterized in that: The protection circuit board further includes a limiting portion provided on the first extension portion and / or the second extension portion, and the packaging layer covers the limiting portion.

10. The protective circuit board according to claim 9, characterized in that: A protruding structure is provided on the third surface of the reinforcing member at a position corresponding to the first extending portion and / or the second extending portion, and the protruding structure constitutes the limiting portion.

11. The protective circuit board according to any one of claims 1 to 10, characterized in that: The circuit board body includes two layers of rigid circuit boards and at least one layer of flexible circuit board sandwiched between the two layers of rigid circuit boards. The connecting member is connected to the rigid circuit boards located on the first surface.

12. A battery assembly, characterized in that: The battery assembly includes a battery cell, a tab connected to the battery cell, and a protection circuit board according to any one of claims 1 to 11, wherein a connector of the protection circuit board is connected to the tab.

13. An electronic device, characterized in that: The electronic device includes the battery assembly according to claim 12.

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