Circuit board assembly of battery, battery and terminal equipment

Abstract

The utility model discloses a circuit board assembly of a battery, the battery and terminal equipment, and belongs to the field of batteries. The circuit board assembly of the battery comprises a control module, a power module, a first circuit board and a second circuit board, the control module is integrated on the first circuit board, the power module is integrated on the second circuit board, the first circuit board is provided with a first step structure, the second circuit board is provided with a second step structure, and the first step structure is connected with the second step structure so that the first circuit board can be connected with the second circuit board. The sum of the thicknesses of the joints after the first step structure and the second step structure are connected is L1, the thickness of the rest part, except the first step structure, of the first circuit board is L2, the thickness of the rest part, except the second step structure, of the second circuit board is L3, and L1 is smaller than L2 + L3. In the application, the multiplexing of the control module and the first circuit board can be realized, and the thickness of the circuit board assembly can be ensured to be small, so that the space occupied by the circuit board assembly is small.

Description

Technical Field

[0001] This application belongs to the field of batteries, and particularly relates to a circuit board assembly, a battery, and a terminal device of a battery. Background Art

[0002] With the development of technology, terminal devices have become common tools in people's daily lives. Through terminal devices, images can be captured, videos can be watched, remote communication can be carried out, etc. Generally, a battery is installed in the terminal device, and the battery provides electrical energy for the terminal device so that the terminal device can operate normally. A circuit board assembly is provided in the battery, and the circuit board assembly controls the charging and discharging of the battery. However, in related technologies, the circuit board assembly is not conducive to reuse, which will cause waste, and the space occupied by the circuit board assembly is relatively large, affecting the size of the battery. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide a circuit board assembly, a battery, and a terminal device of a battery, which at least solve the problem that the circuit board assembly in the battery management system is not conducive to reuse and will cause waste.

[0004] In a first aspect, the embodiments of this application provide a circuit board assembly of a battery. The circuit board assembly of the battery includes: a control module, a power module, a first circuit board, and a second circuit board;

[0005] The control module is integrated on the first circuit board, the power module is integrated on the second circuit board. The first circuit board is provided with a first step structure, and the second circuit board is provided with a second step structure. The first step structure is connected to the second step structure so that the first circuit board is connected to the second circuit board, and the sum of the thicknesses at the connection after the first step structure is connected to the second step structure is L1, and the thickness of the remaining part of the first circuit board except the first step structure is L2, and the thickness of the remaining part of the second circuit board except the second step structure is L3, satisfying: L1 < L2 + L3.

[0006] Optionally, a first pad is provided on the first step structure, and a second pad is provided on the second step structure. The first pad is welded to the second pad so that the first circuit board is connected to the second circuit board.

[0007] Optionally, the first circuit board has a first surface, and a first slot is provided on the first surface. The bottom of the first slot forms the first step structure with the first surface. The circuit board assembly has a second surface, and a second slot is provided on the second surface. The bottom of the second slot forms the second step structure with the second surface;

[0008] The bottom of the first slot is provided with the first pad, the bottom of the second slot is provided with the second pad, and the bottom of the first slot faces the bottom of the second slot so that the first pad is welded to the second pad.

[0009] Optionally, the second circuit board further has a third surface opposite to the second surface, the first circuit board further has a fourth surface opposite to the first surface, the third surface is flush with the first surface, and the second surface is flush with the fourth surface.

[0010] Optionally, the number of the first pads and the number of the second pads are both multiple, the multiple first pads are arranged in an array, and the multiple second pads are arranged in an array.

[0011] Optionally, the control module is integrated at a position on the first surface other than the first slot, and the power module is integrated on the third surface.

[0012] Optionally, a nickel sheet is provided on the second circuit board, and the nickel sheet is used for electrically connecting the ear of the battery cell.

[0013] Optionally, the nickel sheet is welded to the third surface.

[0014] In a second aspect, an embodiment of the present application provides a battery, including a battery cell, an ear, and the circuit board assembly according to any one of the first aspects above;

[0015] The battery cell is connected to the ear, and the ear is connected to the circuit board assembly.

[0016] In a third aspect, the terminal device includes the battery according to the second aspect above.

[0017] In the embodiment of the present application, since the control module is integrated on the first circuit board and the power module is integrated on the second circuit board, the first circuit board and the second circuit board can be connected to form the battery management system of the battery, and the control module and the power module can communicate through the first circuit board and the second circuit board. Since the first circuit board is provided with a first stepped structure and the second circuit board is provided with a second stepped structure, and the first stepped structure is connected to the second stepped structure, the first stepped structure and the second stepped structure can be connected to realize the connection between the first circuit board and the second circuit board, ensuring that communication can be carried out between the control module and the power module. In addition, L1 < L2 + L, so that after connecting the first stepped structure and the second stepped structure, at the connection between the first stepped structure and the second stepped structure, thickness optimization is equivalent, avoiding the problem that the thickness of the connection is large, resulting in a large thickness of the circuit board assembly. That is, in the embodiment of the present application, by integrating the control module on the first circuit board and the power module on the second circuit board, and connecting the first circuit board and the second circuit board, the battery management system is formed, and the first circuit board and the second circuit board can be separated according to actual needs, so that the control module and the first circuit board can be reused, and the power module and the second circuit board can be selected according to actual needs. That is, in the embodiment of the present application, the reuse of the control module and the first circuit board can be realized, waste can be reduced, and L1 < L2 + L can ensure that the thickness of the circuit board assembly is small, and thus the space occupied by the circuit board assembly is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 shows one of the exploded views of a circuit board assembly of a battery provided by an embodiment of the present application;

[0019] Figure 2 FIG. 2 shows another exploded view of a circuit board assembly of a battery provided by an embodiment of the present application;

[0020] Figure 3 FIG. 3 shows a schematic diagram of a second circuit board provided by an embodiment of the present application;

[0021] Figure 4 FIG. 4 shows a schematic diagram of a first circuit board provided by an embodiment of the present application;

[0022] Figure 5 FIG. 5 shows one of the schematic diagrams of the connection between a first stepped structure and a second stepped structure provided by an embodiment of the present application;

[0023] Figure 6 FIG. 6 shows one of the side views of a first circuit board provided by an embodiment of the present application;

[0024] Figure 7 FIG. 7 shows one of the side views of a second circuit board provided by an embodiment of the present application;

[0025] Figure 8 It shows the second schematic diagram of the connection between a first step structure and a second step structure provided by an embodiment of the present application;

[0026] Figure 9 It shows the second side view of a first circuit board provided by an embodiment of the present application;

[0027] Figure 10 It shows the second side view of a second circuit board provided by an embodiment of the present application.

[0028] Reference numerals:

[0029] 10: Control module; 20: Power module; 30: First circuit board; 31: First surface; 32: Fourth surface; 301: First pad; 311: First slot; 40: Second circuit board; 41: Second surface; 42: Third surface; 401: Second pad; 411: Second slot; 50: Nickel sheet. Detailed implementation manners

[0030] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, "a plurality of" means two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0032] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] As Figures 1 to 10 shown, the circuit board assembly of the battery includes: a control module 10 integrated on a first circuit board 30, and a power module 20 integrated on a second circuit board 40. The first circuit board 30 is provided with a first stepped structure 310, and the second circuit board 40 is provided with a second stepped structure 410. The first stepped structure 310 is connected to the second stepped structure 410 so that the first circuit board 30 is connected to the second circuit board 40. After the first stepped structure 310 is connected to the second stepped structure 410, the sum of the thicknesses at the connection is L1. The thickness of the remaining part of the first circuit board 30 except the first stepped structure 310 is L2, and the thickness of the remaining part of the second circuit board 40 except the second stepped structure 410 is L3, satisfying: L1 < L2 + L3.

[0034] In the embodiment of the present application, since the control module 10 is integrated on the first circuit board 30 and the power module 20 is integrated on the second circuit board 40, the first circuit board 30 can be connected to the second circuit board 40, thereby forming a battery management system of the battery. And the control module 10 and the power module 20 can communicate through the first circuit board 30 and the second circuit board 40. Since the first circuit board 30 is provided with the first stepped structure 310 and the second circuit board 40 is provided with the second stepped structure 410, and the first stepped structure 310 is connected to the second stepped structure 410, the first stepped structure 310 can be connected to the second stepped structure 410, realizing the connection between the first circuit board 30 and the second circuit board 40, and ensuring that communication can be carried out between the control module 10 and the power module 20. In addition, L1 < L2 + L3, so that it can be ensured that after the first stepped structure 310 is connected to the second stepped structure 410, at the connection between the first stepped structure 310 and the second stepped structure 410, thickness optimization is performed, avoiding the problem that the thickness of the connection is too large, resulting in a large thickness of the circuit board assembly. That is, in the embodiment of the present application, by integrating the control module 10 on the first circuit board 30 and the power module 20 on the second circuit board 40, and connecting the first circuit board 30 and the second circuit board 40, a battery management system is formed. And according to actual needs, the first circuit board 30 and the second circuit board 40 can be separated, so that the control module 10 and the first circuit board 30 can be reused, and the power module 20 and the second circuit board 40 can be selected according to actual needs. That is, in the embodiment of the present application, the reuse of the control module 10 and the first circuit board 30 can be realized, reducing waste, and L1 < L2 + L can ensure that the thickness of the circuit board assembly is small, and further making the space occupied by the circuit board assembly small.

[0035] In the related art, the control module 10 and the power module 20 in the battery management system are integrated on the same circuit board assembly. Therefore, in practical applications, when the power module 20 needs to be adjusted, only the control module 10 and the power module 20 can be adjusted simultaneously. That is, in the related art, the control module 10 cannot be reused, resulting in waste and increased costs. In the embodiment of the present application, by integrating the control module 10 on the first circuit board 30 and the power module 20 on the second circuit board 40, and connecting the first circuit board 30 and the second circuit board 40, the specific solution of the control module 10 and the size of the first circuit board 30 can be fixed according to actual needs. When the power module 20 needs to be adjusted, the first circuit board 30 and the second circuit board 40 can be separated, and the power module 20 and the second circuit board 40 can be replaced to realize the reuse of the control module 10 and the first circuit board 30, achieving the effects of cost savings and waste reduction.

[0036] It should be noted that the control module 10 may include multiple control components, and multiple control components can be welded on the first circuit board 30, so that the control module 10 is integrated on the first circuit board 30; the power module 20 may also include multiple power components, and multiple power components can also be welded on the second circuit board 40, so that the power module 20 is integrated on the second circuit board 40.

[0037] In addition, in the embodiment of the present application, both the first circuit board 30 and the second circuit board 40 can be printed circuit board assemblies (Printed Circuit Board, PCB).

[0038] In addition, in some embodiments, as Figure 1 and Figure 2 shown, a first pad 301 is provided on the first step structure 310, and a second pad 401 is provided on the second step structure 410. The first pad 301 and the second pad 401 are welded to connect the first circuit board 30 and the second circuit board 40.

[0039] Since the first pad 301 is provided on the first stepped structure 310 and the second pad 401 is provided on the second stepped structure 410, when the first circuit board 30 needs to be connected to the second circuit board 40, the first pad 301 and the second pad 401 can be directly soldered to achieve the connection between the first circuit board 30 and the second circuit board 40. Moreover, by soldering the first pad 301 and the second pad 401, communication can be enabled between the first circuit board 30 and the second circuit board 40, thereby enabling communication between the control module 10 and the power module 20. That is, by providing the first pad 301 on the first stepped structure 310 and the second pad 401 on the second stepped structure 410, the connection between the first circuit board 30 and the second circuit board 40 can be facilitated, and communication between the control module 10 and the second power module 20 can be ensured.

[0040] It should be noted that the shape of the first pad 301 can be set according to actual needs. For example, the shape of the first pad 301 is circular, or for another example, the shape of the first pad 301 is square. The embodiments of the present application do not limit this here. Additionally, the shape of the second pad 401 can also be set according to actual needs. For example, the shape of the second pad 401 is circular, or for another example, the shape of the second pad 401 is square. The embodiments of the present application do not limit this here.

[0041] In addition, in some embodiments, as Figure 1 and Figure 2 shown, the first circuit board 30 has a first surface 31, and a first slot 311 is provided on the first surface 31. The bottom of the first slot 311 and the first surface 31 form the first stepped structure 310. The second circuit board 40 has a second surface 41, and a second slot 411 is provided on the second surface 41. The bottom of the second slot 411 and the second surface 41 form the second stepped structure 410; the first pad 301 is provided at the bottom of the first slot 311, the second pad 401 is provided at the bottom of the second slot 411, and the bottom of the first slot 311 faces the bottom of the second slot 411 to solder the first pad 301 and the second pad 401.

[0042] Since the bottom of the first slot 311 on the first circuit board 30 forms a step with the first surface 31, and the bottom of the second slot 411 on the second circuit board 40 forms a step with the second surface 41, the first pad 301 can be disposed at the bottom of the first slot 311, and the second pad 401 can be disposed at the bottom of the second slot 411. Thus, when the first pad 301 and the second pad 401 are welded, the bottom of the first slot 311 can face the bottom of the second slot 411, so that the first pad 301 and the second pad 401 are welded. Moreover, the first slot 311 and the second slot 411 will at least partially overlap, such that after the first pad 301 and the second pad 401 are welded, the thickness of the first circuit board 30 and the second circuit board 40 at the welding position of the first pad 301 and the second pad 401 is small, avoiding the problem that the thickness of the battery's circuit board assembly is large after the first circuit board 30 and the second circuit board 40 are connected by welding the first pad 301 and the second pad 401, which ultimately leads to poor utilization of the internal space of the battery. That is, by providing the first slot 311 on the first circuit board 30, the second slot 411 on the second circuit board 40, with the first pad 301 disposed at the bottom of the first slot 311 and the second pad 401 disposed at the bottom of the second slot 411, the thickness of the first circuit board 30 and the second circuit board 40 at the welding position of the first pad 301 and the second pad 401 can be small after the first pad 301 and the second pad 401 are welded.

[0043] It should be noted that the first slot 311 can be a counterbore, and the second slot 411 can also be a counterbore.

[0044] In addition, in the embodiments of the present application, the number of the first slots 311 can be set according to actual needs. For example, as Figure 6 shown, the number of the first slots 311 is 1. At this time, the first step structure 310 is equivalent to a first-level step. Again, for example, as Figure 9 shown, the number of the second slots is 2. At this time, the first step structure 310 is equivalent to a second-level step. The specific number of the first slots 311 is not limited in the embodiments of the present application. In addition, the number of the second slots 411 can be set according to actual needs. For example, as Figure 7 shown, the number of the first slots 311 is 1. At this time, the second step structure 410 is equivalent to a first-level step. Again, for example, as Figure 10 shown, the number of the second slots is 2. At this time, the second step structure 410 is equivalent to a second-level step. The specific number of the second slots 411 is not limited in the embodiments of the present application.

[0045] In addition, in some embodiments, as Figure 1 and Figure 2As shown, the second circuit board 40 further has a third surface 42 opposite to the second surface 41, the first circuit board 30 further has a fourth surface 32 opposite to the first surface 31, the third surface 42 is flush with the first surface 31, and the second surface 41 is flush with the fourth surface 32.

[0046] Since the third surface 42 is flush with the first surface 31 and the second surface 41 is flush with the fourth surface 32, after the first circuit board 30 and the second circuit board 40 are welded through the first pad 301 and the second pad 401, the thickness of the first circuit board 30 and the second circuit board 40 at the welding position of the first pad 301 and the second pad 401 can be made equal to their respective thicknesses. The sum of the thicknesses of the first circuit board 30 and the second circuit board 40 at the welding position of the first pad 301 and the second pad 401 is equal to the thickness of the remaining positions of the first circuit board 30, and is also equal to the thickness of the remaining positions of the second circuit board 40. That is, by setting the third surface 42 to be flush with the first surface 31 and the second surface 41 to be flush with the fourth surface 32, the thickness of the first circuit board 30 and the second circuit board 40 at the welding position of the first pad 301 and the second pad 401 will not increase additionally. Furthermore, when the circuit board assembly of the battery is applied to the battery, it will not additionally occupy the internal size of the battery.

[0047] In addition, in some embodiments, the number of the first pads 301 and the number of the second pads 401 are both multiple. The multiple first pads 301 are arranged in an array, and the multiple second pads 401 are arranged in an array.

[0048] Since the multiple first pads 301 and the multiple second pads 401 are both arranged in an array, when the first pad 301 and the second pad 401 are welded, one first pad 301 can be welded to one second pad 401, so that the first circuit board 30 and the second circuit board 40 are firmly connected, and it is beneficial for the control module 10 on the first circuit board 30 to communicate with the power module 20 on the second circuit board 40. That is, by setting the multiple first pads 301 and the multiple second pads 401 to be both arranged in an array, the firmness of the connection between the first circuit board 30 and the second circuit board 40 can be effectively ensured, and the stability of the communication between the control module 10 and the power module 20 can be ensured.

[0049] It should be noted that the number of the first pads 301 and the number of the second pads 401 can both be set according to actual needs. For example, the number of the first pads 301 is 10, and the number of the second pads 401 is 10. For another example, the number of the first pads 301 is 15, and the number of the second pads 401 is 15. The specific number of the first pads 301 and the specific number of the second pads 401 are not limited in the embodiments of the present application.

[0050] In addition, in some embodiments, such asFigure 1 and Figure 2 As shown in Figure 2 , the control module 10 is integrated at a position on the first surface 31 other than the first slot 311, and the power module 20 is integrated on the third surface 42.

[0051] Since the control module 10 is integrated at a position on the first surface 31 other than the first slot 311, and the power module 20 is integrated on the third surface 42, and the first surface 31 and the third surface 42 face the same direction, it is equivalent to that the control module 10 and the power module 20 are on the same side. Furthermore, when the circuit board assembly of the battery is arranged in the battery, it can avoid the problem that components are integrated on both sides of the battery board, resulting in more space occupied by the circuit board assembly in the battery and being unfavorable for improving the space utilization rate of the battery. That is, by integrating the control module 10 at a position on the first surface 31 other than the first slot 311 and integrating the power module 20 on the third surface 42, the space utilization rate inside the battery can be effectively improved when the circuit board assembly is arranged in the battery.

[0052] In addition, in some embodiments, as Figure 1 and Figure 2 shown, a nickel sheet 50 is arranged on the second circuit board 40, and the nickel sheet 50 is used to electrically connect the ear of the battery cell of the battery.

[0053] Since the nickel sheet 50 is arranged on the second circuit board 40, after the circuit board assembly is installed in the battery, the nickel sheet 50 can be connected to the ear of the battery cell, which is equivalent to that the battery cell is connected to the battery management system, and then the battery management system can control and manage the battery cell. That is, by arranging the nickel sheet 50 on the second circuit board 40, it is convenient for the battery management system to connect the battery cell when the circuit board assembly is applied to the battery, so as to control and manage the battery cell.

[0054] In addition, in the embodiment of the present application, the nickel sheet 50 can be welded on the second circuit board 40, so that the nickel sheet 50 can be electrically connected to the power module 20 through the second circuit board 40, so that the information of the power module 20 can be transmitted to the nickel sheet 50 and then transmitted to the battery cell.

[0055] In addition, in some embodiments, as Figure 3 shown, the nickel sheet 50 is welded on the third surface 42. Through such a setting, it is equivalent to that the nickel sheet 50 and the power module 20 are on the same side. At this time, the power module 20, the control module 10 and the nickel sheet 50 are on the same side, so that when the circuit board assembly is applied to the battery, it can avoid the problem that devices are arranged on both sides of the circuit board assembly, resulting in a large space occupied by the circuit board assembly in the battery. That is, by integrating the nickel sheet 50 on the third surface 42, the space utilization rate inside the battery can be effectively improved when the circuit board assembly is arranged in the battery.

[0056] In the embodiment of the present application, since the control module 10 is integrated on the first circuit board 30 and the power module 20 is integrated on the second circuit board 40, the first circuit board 30 and the second circuit board 40 can be connected to form a battery management system of the battery, and the control module 10 and the power module 20 can communicate through the first circuit board 30 and the second circuit board 40. Since the first circuit board 30 is provided with a first step structure 310 and the second circuit board 40 is provided with a second step structure 410, and the first step structure 310 is connected to the second step structure 410, the first step structure 310 and the second step structure 410 can be connected to realize the connection between the first circuit board 30 and the second circuit board 40, ensuring that communication can be carried out between the control module 10 and the power module 20. In addition, L1 < L2 + L3, so that after the first step structure 310 and the second step structure 410 are connected, at the connection between the first step structure 310 and the second step structure 410, thickness optimization is equivalent, avoiding the problem that the thickness of the connection is too large, resulting in a large thickness of the circuit board assembly. That is, in the embodiment of the present application, by integrating the control module 10 on the first circuit board 30 and the power module 20 on the second circuit board 40, the first circuit board 30 and the second circuit board 40 are connected to form a battery management system, and according to actual needs, the first circuit board 30 and the second circuit board 40 can be separated, so that the control module 10 and the first circuit board 30 can be reused, and the power module 20 and the second circuit board 40 can be selected according to actual needs. That is, in the embodiment of the present application, the reuse of the control module 10 and the first circuit board 30 can be realized, reducing waste, and L1 < L2 + L can ensure that the thickness of the circuit board assembly is small, and further making the space occupied by the circuit board assembly small.

[0057] The embodiment of the present application provides a battery, which includes a housing and the circuit board assembly in any of the above embodiments, and the circuit board assembly is located in the housing.

[0058] The embodiment of the present application provides a terminal device, which includes the battery in the above embodiment.

[0059] It should be noted that, in the embodiment of the present application, the electronic device includes, but is not limited to, devices such as controllers, smart devices, and terminal products. Among them, smart devices are, for example, smart phones, smart TVs, smart speakers, smart robots, VR devices, AR devices, XR devices, etc., and terminal products include products such as personal computers and tablet computers.

[0060] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this application, and the scope of this application is defined by the claims and their equivalents.

Claims

1. A circuit board assembly for a battery, characterized in that, The circuit board assembly of the battery includes: a control module (10), a power module (20), a first circuit board (30), and a second circuit board (40); The control module (10) is integrated on the first circuit board (30), the power module (20) is integrated on the second circuit board (40), the first circuit board (30) is provided with a first step structure (310), the second circuit board (40) is provided with a second step structure (410), the first step structure (310) is connected to the second step structure (410) so that the first circuit board (30) is connected to the second circuit board (40), and the sum of the thicknesses at the connection after the first step structure (310) is connected to the second step structure (410) is L1, the thickness of the remaining part of the first circuit board (30) except the first step structure (310) is L2, and the thickness of the remaining part of the second circuit board (40) except the second step structure (410) is L3, satisfying: L1 < L2 + L3.

2. The circuit board assembly of the battery according to claim 1, wherein A first pad (301) is provided on the first step structure (310), a second pad (401) is provided on the second step structure (410), and the first pad (301) is welded to the second pad (401) so that the first circuit board (30) is connected to the second circuit board (40).

3. The circuit board assembly of the battery according to claim 2, characterized in that The first circuit board (30) has a first surface (31), a first slot (311) is provided on the first surface (31), and the bottom of the first slot (311) and the first surface (31) form the first step structure (310). The second circuit board (40) has a second surface (41), a second slot (411) is provided on the second surface (41), and the bottom of the second slot (411) and the second surface (41) form the second step structure (410); The first pad (301) is provided at the bottom of the first slot (311), the second pad (401) is provided at the bottom of the second slot (411), and the bottom of the first slot (311) faces the bottom of the second slot (411) so that the first pad (301) is welded to the second pad (401).

4. The circuit board assembly of the battery according to claim 3, characterized in that, The second circuit board (40) further has a third surface (42) opposite to the second surface (41), the first circuit board (30) further has a fourth surface (32) opposite to the first surface (31), the third surface (42) is flush with the first surface (31), and the second surface (41) is flush with the fourth surface (32).

5. The circuit board assembly of the battery according to claim 2, characterized in that, The number of the first pads (301) and the number of the second pads (401) are both multiple, the multiple first pads (301) are arranged in an array, and the multiple second pads (401) are arranged in an array.

6. The circuit board assembly of the battery according to claim 4, characterized in that The control module (10) is integrated at a position on the first surface (31) other than the first slot (311), and the power module (20) is integrated on the third surface (42).

7. The circuit board assembly of the battery according to claim 4, wherein A nickel sheet (50) is provided on the second circuit board (40), and the nickel sheet (50) is used for electrically connecting the tab of the battery cell.

8. The circuit board assembly of the battery according to claim 7, characterized in that The nickel sheet (50) is welded to the third surface (42).

9. A battery, characterized in that, It includes a battery cell, a tab, and the circuit board assembly according to any one of claims 1-8; The battery cell is connected to the tab, and the tab is connected to the circuit board assembly.

10. A terminal device, characterized in that, The terminal device includes the battery according to claim 9.

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