Lithium battery protection plate assembly and lithium battery

Abstract

The utility model provides a lithium battery protection plate assembly and a lithium battery. The lithium battery protection plate assembly comprises a first plate body, and the first plate body is provided with a connecting structure; the second plate body is connected with the first plate body through a connecting structure, and a gap is formed between the first plate body and the second plate body; the circuit structure comprises a first circuit and a second circuit, the first circuit is located on the first board body, the second circuit is located on the second board body, and the first circuit is connected with the second circuit in parallel through a connecting structure; and the adhesive structure is filled in the gap to form an adhesive layer, and the adhesive layer is used for dissipating heat of the circuit structure. The lithium battery protection plate assembly provided by the utility model solves the problem that the overall heat dissipation capability of the lithium battery protection plate in the prior art is limited.

Description

Technical Field

[0001] The utility model relates to the technical field of mobile phone batteries, and in particular to a lithium battery protection board assembly and a lithium battery. Background Art

[0002] With the advancement of mobile phone lithium battery technology, fast-charging devices generate heat, and MOS tubes (Metal-Oxide-Semiconductor Field-Effect Transistors) packaged in CSP (Chip Scale Package) are in an unprotected state. When assembling the battery protection board to the battery, the device is easily damaged. In addition, the improvement of charging performance requires higher heat dissipation of heating devices. The lithium battery protection board provided in the prior art can increase the heat dissipation capacity of the protection board by covering the surface of the protection board motherboard with thermal conductive glue, but the heat dissipation capacity is limited. Utility Model Content

[0003] The main purpose of the utility model is to provide a lithium battery protection board assembly and a lithium battery, so as to solve the problem of limited overall heat dissipation capacity of the lithium battery protection board in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present utility model, a lithium battery protection plate assembly is provided, including a first plate body, the first plate body having a connecting structure; a second plate body, the second plate body is connected to the first plate body through the connecting structure, and a gap is formed between the first plate body and the second plate body; a circuit structure, the circuit structure includes a first circuit and a second circuit, the first circuit is located on the first plate body, the second circuit is located on the second plate body, and the first circuit is connected in parallel with the second circuit through the connecting structure; a glue structure, the glue structure is filled in the gap to form a glue layer, and the glue layer is used to dissipate heat from the circuit structure.

[0005] Furthermore, the first plate and the second plate are attached to the adhesive structure at one side thereof close to the adhesive structure.

[0006] Furthermore, the connection structure includes at least two connection parts spaced apart along the length direction of the first plate body, one end of the second plate body is connected to one of the connection parts, and the other end of the second plate body is connected to the other connection part.

[0007] Furthermore, the connecting portion includes one or more soldering pads, and the second plate body is fixed to the soldering pads by welding.

[0008] Furthermore, the second plate body has a matching portion that matches the connecting portion, and the connecting portion and the matching portion are snap-fitted or the connecting portion and the matching portion are detachably connected via a fastener.

[0009] Furthermore, the second plate body includes a first plate segment arranged on the side of the adhesive structure away from the first plate body, a gap is formed between the first plate segment and the first plate body, and along the length direction of the first plate body, the second plate body also includes a second plate segment arranged at both ends of the first plate segment, the second plate segment is bent toward one side of the first plate body, and the second plate segment is connected to the first plate body through a connecting structure.

[0010] Furthermore, the projected length of the second plate body on the first plate body is not greater than the length of the first plate body, and the width of the second plate body is not greater than the width of the second plate body.

[0011] Furthermore, the width of the adhesive structure is less than or equal to the width of the second plate body, the length of the adhesive structure is less than or equal to the length of the second plate body; and / or the adhesive structure includes thermally conductive filling adhesive.

[0012] Furthermore, the first plate body is a rigid plate, and the second plate body is a flexible plate.

[0013] Furthermore, the lithium battery protection board assembly also includes electronic components arranged on the first board body, the electronic components are electrically connected to the first board body, and the adhesive structure covers the electronic components.

[0014] According to another aspect of the present invention, a lithium battery is provided, comprising the above-mentioned lithium battery protection board assembly.

[0015] By applying the technical solution of the present invention, a second plate is added on the basis of the first plate. Since the second plate has a second circuit and the second circuit is connected in parallel with the first circuit, the resistance of the circuit of the entire lithium battery protection board assembly can be reduced, thereby effectively reducing the overall heat generation and achieving a cooling effect.

[0016] At the same time, the circuit located on the second board receives part originally located on the first board, reducing the concentration of the circuit on the first board, increasing the area where the circuit can be arranged, making the circuit more dispersed than in the case of a separate main board, reducing heat concentration, and increasing the heat dissipation area. The glue layer formed by the glue structure dissipates heat for the first circuit and the second circuit, effectively improving the heat dissipation and heat equalization capabilities of the entire lithium battery protection board assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 Shows the overall structural diagram of the lithium battery protection board assembly;

[0019] Figure 2 An exploded view of a lithium battery protection board assembly is shown;

[0020] Figure 3 Shown is a side view of a lithium battery protection board assembly.

[0021] The above drawings include the following reference numerals:

[0022] 10. First plate body; 11. Connection structure; 12. Connection portion; 13. Electronic components; 20. Second plate body; 21. Gap; 22. First plate segment; 23. Second plate segment; 30. Adhesive structure. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0025] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0026] In order to solve the problem of limited overall heat dissipation capacity of a lithium battery protection board in the prior art, this embodiment provides a lithium battery protection board assembly and a lithium battery.

[0027] See also Figures 1 to 3 The lithium battery protection board assembly includes a first board 10, a second board 20, a circuit structure and a glue structure 30. The first board 10 has a connecting structure 11, and the second board 20 is connected to the first board 10 through the connecting structure 11. A gap 21 is formed between the first board 10 and the second board 20. The circuit structure includes a first circuit and a second circuit. The first circuit is located on the first board and the second circuit is located on the second board 20. The first circuit is connected in parallel with the second circuit through the connecting structure 11; the glue structure 30 is filled in the gap 21 to form a glue layer, which is used to dissipate heat from the circuit structure.

[0028] A second plate 20 is added to the first plate 10. Since the second plate 20 has a second circuit, and the second circuit is connected in parallel with the first circuit, the resistance of the entire lithium battery protection board assembly circuit can be reduced, thereby effectively reducing overall heat generation and achieving a cooling effect. At the same time, the second plate 20 receives a portion of the circuit originally located on the first plate 10, reducing the concentration of circuits on the first plate 10 and increasing the area available for circuit layout. This makes the circuits more dispersed than in the case of a separate main board, reducing heat concentration and increasing the heat dissipation area. The adhesive layer formed by the adhesive structure 30 dissipates heat from the first and second circuits, effectively improving the heat dissipation and heat distribution capabilities of the entire lithium battery protection board assembly.

[0029] The first board 10, serving as the main board, has electronic components 13 and a first circuit thereon. The first circuit and electronic components 13 are electrically connected, enabling signal and data transmission between the electronic components 13. A second board 20 is disposed on one side of the first board 10 and connected to the first board 10 via a connecting structure 11. This connecting structure 11 not only physically connects the first and second boards 10, stably securing the second board 20 to the first board 10, but also electrically connects the first and second boards 10, achieving parallel connection between the first and second circuits. The first board 10 is typically a rigid board, while the second board can be either a rigid or flexible board. A rigid board can be a PCB, while a flexible board is typically an FPC. If the second board 20 is a rigid board, it requires a partial bending structure for connection to the first board 10. If the second board 20 is a flexible board, the flexible board itself can be bent, allowing it to be directly connected to the second board 20. The adhesive structure 30 is arranged between the first plate 10 and the second plate 20 to form an adhesive layer. The adhesive structure 30 can be a thermally conductive filling adhesive or gel, etc., which uniformly dissipates heat from the first plate 10 and the second plate 20, effectively improving the heat dissipation effect of the first plate 10 and the second plate 20.

[0030] The first circuit and the second circuit are both copper wire structures with conductive properties. The first circuit is embedded in the first board 10 , and the second circuit is embedded in the second board 20 .

[0031] In this embodiment, the first plate 10 and the second plate 20 are attached to the adhesive structure 30 at their sides close to the adhesive structure 30 .

[0032] The adhesive structure 30 is thermally conductive. When the first and second plates 10, 20 are bonded to the adhesive structure 30, heat generated by the circuit structure is transferred to the outside world, dissipating heat from the circuit structure. Because the circuit structure does not completely cover the first and second plates 10, 20, during actual use, locations with the circuit structure generate more heat, while locations uncovered generate less heat. The adhesive structure 30 evenly distributes heat between locations with higher and lower heat output, effectively improving heat dissipation across the first and second plates 10, 20.

[0033] See also Figure 2 The connection structure 11 includes at least two connection parts 12 spaced apart along the length direction of the first plate body 10, one end of the second plate body 20 is connected to one of the connection blocks, and the other end of the second plate body 20 is connected to the other connection block.

[0034] Because the first and second circuits are connected in parallel via the connection structure 11, at least two connection points are required between the first and second plates 10, 20 to achieve circuit continuity. The first and second plates 10, 20 are typically elongated. To improve the stability of the connection between the first and second plates 10, 20, the longitudinal ends of the first and second plates 10, 20 should be connected. Therefore, two connection portions 12 are provided along the longitudinal direction of the first and second plates 10, 20. The connection structure 11 not only connects the first and second plates 10, 20, but also positions the second plate 20 before connection, facilitating connection between the first and second plates 10, 20.

[0035] Of course, the two connecting portions 12 can also be provided at the ends of the first plate 10 and the second plate 20 in the width direction or at other positions, as long as the connection between the first plate 10 and the second plate 20 is achieved. The connecting portions 12 being provided at the ends of the first plate 10 and the second plate 20 in the length direction is the best embodiment.

[0036] In this embodiment, the connecting portion 12 includes one or more pads, and one end of the second board 20 is connected to the one or more pads.

[0037] The welding pads can be used to achieve welding between the first plate 10 and the second plate 20. To increase the connection strength between the first plate 10 and the second plate 20, multiple welding pads can be provided to increase the number of connection points between the first plate 10 and the second plate 20 and increase the stability of the connection between the first plate 10 and the second plate 20. When multiple welding points are provided, the multiple welding points are spaced along the length or width of the second plate 20 to facilitate the welding process.

[0038] In this embodiment, the second plate body 20 has a matching portion that matches the connecting portion 12 , and the connecting portion 12 and the matching portion are snap-fitted or detachably connected to each other via a fastener.

[0039] The first plate 10 and the second plate 20 are connected by welding or by a removable connection. When the first plate 10 and the second plate 20 are welded, the connection structure 11 is a soldering pad to facilitate welding. When the first plate 10 and the second plate 20 are removably connected, the removable connection can be plugged in. The connection structure 11 on the first plate 10 is a plug-in structure. During installation, the second plate 20 is directly plugged into the first plate 10.

[0040] See also Figure 3 The second plate body 20 includes a first plate segment 22 arranged on the side of the colloid away from the first plate body 10, and a gap 21 is formed between the first plate segment 22 and the first plate body 10. Along the length direction of the first plate body 10, the second plate body 20 also includes a second plate segment 23 arranged at both ends of the first plate segment 22, and the second plate segment 23 is bent toward the side of the first plate body 10. The second plate segment 23 is connected to the first plate body 10 through the connecting structure 11.

[0041] Since there is a gap 21 between the first plate body 10 and the second plate body 20, and the adhesive structure 30 between the first plate body 10 and the second plate body 20 forms an adhesive layer, the first plate body 10 and the second plate body 20 cannot be directly adhered to each other on one side. By setting the second plate body 20 into different plate segments, the second plate segments 23 located at both ends of the first plate segment 22 are used to form the gap 21, so that a gap 21 is formed between the first plate segment 22 of the main part and the first plate body 10.

[0042] When the second plate body 20 is a hard plate, the first plate segment 22 and the second plate segment 23 are fixed structures; when the second plate body 20 is a soft plate, the second plate segment 23 is formed by bending the first plate segment 22, and during the bending process, the two ends of the soft plate are bent to the same extent and serve as a bending standard, so that the second plate bodies 20 of different lithium battery protection board assemblies have the same specifications after bending, thereby increasing uniformity.

[0043] In this embodiment, the projected length of the second plate body 20 on the first plate body 10 is not greater than the length of the first plate body 10 , and the width of the second plate body 20 is not greater than the width of the second plate body 20 .

[0044] Since the connection structure 11 is located on the first board 10, if the projected length of the second board 20 on the first board 10 is greater than the length of the first main board, when the second board 20 is connected, the second board 20 may be partially stacked or partially protruded, which will affect the normal use of the flexible board or the overall installation of the protection board assembly.

[0045] In this embodiment, the width of the adhesive structure 30 is less than or equal to the width of the second plate body 20 , the length of the adhesive structure 30 is less than or equal to the length of the second plate body 20 , and the adhesive structure 30 includes thermally conductive filling adhesive.

[0046] The adhesive structure 30 is used to bond with the first and second plates 10, 20, distributing heat evenly and dissipating heat from the circuit structures thereon. To maximize the utilization of the adhesive structure 30 and minimize waste, the adhesive structure 30 is located only between the first and second plates 10, 20, and does not extend beyond the coverage area of the smaller of the first and second plates 10, 20. In this embodiment, the second plate 20 is the smaller of the two, so the length and width of the adhesive structure 30 are smaller than those of the second plate 20.

[0047] The thermal conductive filler has the ability to dissipate heat and distribute heat evenly. After being attached to the first and second plates 10 and 20, the heat dissipation capacity of the first and second plates 10 and 20 is increased. The adhesive structure 30 is not limited to thermal conductive filler and can also be gel or PUR.

[0048] In this embodiment, the first board 10 is a hard board, and the second board 20 is a soft board.

[0049] The first board 10 as a hard board plays the role of main support and main carrier, and the second board 20 is configured as a soft board to facilitate the connection between the second board 20 and the first board 10. The hard board is generally a PCB board, and the soft board is an FPC board.

[0050] See also Figure 2 The first plate body 10 and the second plate body 20 are connected by welding or detachable connection.

[0051] When the first plate 10 and the second plate 20 are welded, the connection structure 11 is a welding pad to facilitate welding. When the first plate 10 and the second plate 20 are detachably connected, the detachable connection can be a plug-in connection. The connection structure 11 on the first plate 10 is a plug-in connection structure. During installation, the second plate 20 is directly plugged into the first plate 10.

[0052] The lithium battery protection board assembly further includes an electronic component 13 disposed on the first board 10 . The electronic component 13 is electrically connected to the first board 10 , and the adhesive structure 30 covers the electronic component 13 .

[0053] The electronic components 13, including resistors and chips, also generate some heat during use. The adhesive structure 30 covers the electronic components 13, facilitating heat dissipation. Furthermore, the second plate 20 and the adhesive layer further protect the electronic components 13 to a certain extent, effectively improving the protective performance of the electronic components 13.

[0054] This embodiment provides a lithium battery, including the lithium battery protection plate structure of the above embodiment.

[0055] Installation process: Brush solder paste on the surface of the first board 10, then attach the components and pass the furnace, apply glue or gel, attach the second board 20, weld and fix it, place the entire protective plate structure into the groove of the tab, weld it to the tab, and wrap the outer layer with glue paper to finally form a lithium battery.

[0056] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0057] 1. Adding a second board 20 to the first board 10. Since the second board 20 has a second circuit, and the second circuit is connected in parallel with the first circuit, it can reduce the resistance of the entire lithium battery protection board assembly circuit, thereby effectively reducing the overall heat generation and achieving a cooling effect. At the same time, the second board 20 receives part of the circuit originally located on the first board 10, reducing the concentration of circuits on the first board 10 and increasing the area available for circuit layout. This makes the circuit more dispersed than in the case of a separate main board, reducing heat concentration and increasing the heat dissipation area. The adhesive layer formed by the adhesive structure 30 dissipates heat from the first and second circuits, effectively improving the heat dissipation and heat distribution capabilities of the entire lithium battery protection board assembly.

[0058] 2. The adhesive structure 30 has thermal conductivity. When the first and second plates 10, 20 are bonded to the adhesive structure 30, the heat generated by the circuit structure is transferred to the outside world, achieving heat dissipation of the circuit structure. Because the circuit structure does not completely cover the first and second plates 10, 20, in actual use, the areas with the circuit structure generate more heat, while the areas not covered by the circuit structure generate less heat. By installing the adhesive structure 30, the heat generated by the first and second plates 10, 20 is evenly distributed between the areas with high and low heat generation, effectively improving the heat dissipation effect of the first and second plates 10, 20.

[0059] 3. Welding between the first plate 10 and the second plate 20 can be achieved through welding pads. To increase the connection strength between the first plate 10 and the second plate 20, multiple welding pads can be provided to increase the number of connection points between the first plate 10 and the second plate 20 and increase the stability of the connection between the first plate 10 and the second plate 20. When multiple welding points are provided, the multiple welding points are spaced along the length or width of the second plate 20 to facilitate the welding process.

[0060] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0062] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A lithium battery protection board assembly, characterized in that: include: A first plate body (10), wherein the first plate body (10) has a connecting structure (11); a second plate body (20), the second plate body (20) being connected to the first plate body (10) via the connecting structure (11), and a gap (21) being formed between the first plate body (10) and the second plate body (20); A circuit structure comprising a first circuit and a second circuit, wherein the first circuit is located on the first board (10), the second circuit is located on the second board (20), and the first circuit is connected in parallel with the second circuit via the connection structure (11); A glue structure (30) is filled in the gap (21) to form a glue layer, and the glue layer is used to dissipate heat from the circuit structure.

2. The lithium battery protection board assembly according to claim 1, characterized in that: The first plate body (10) and the second plate body (20) are in contact with the adhesive structure (30) at one side thereof.

3. The lithium battery protection board assembly according to claim 1, characterized in that: The connecting structure (11) comprises two connecting parts (12) spaced apart along the length direction of the first plate body (10), one end of the second plate body (20) is connected to one of the connecting parts (12), and the other end of the second plate body (20) is connected to the other connecting part (12).

4. The lithium battery protection board assembly according to claim 3, characterized in that: The connecting portion (12) includes one or more soldering pads, and the second plate (20) is fixed to the soldering pads by welding.

5. The lithium battery protection board assembly according to claim 3, characterized in that: The second plate body (20) has a matching portion that matches the connecting portion (12), and the connecting portion (12) and the matching portion are snap-connected or the connecting portion (12) and the matching portion are detachably connected via a fastener.

6. The lithium battery protection board assembly according to claim 1, characterized in that: The second plate body (20) includes a first plate segment (22) arranged on the side of the adhesive structure (30) facing away from the first plate body (10), and the gap (21) is formed between the first plate segment (22) and the first plate body (10); along the length direction of the first plate body (10), the second plate body (20) also includes second plate segments (23) arranged at both ends of the first plate segment (22), the second plate segment (23) is bent toward one side of the first plate body (10), and the second plate segment (23) is connected to the first plate body (10) through the connecting structure (11).

7. The lithium battery protection board assembly according to claim 1, characterized in that: The projected length of the second plate (20) on the first plate (10) is not greater than the length of the first plate (10), and the width of the second plate (20) is not greater than the width of the second plate (20).

8. The lithium battery protection board assembly according to claim 1, characterized in that: The width of the adhesive structure (30) is less than or equal to the width of the second plate (20), and the length of the adhesive structure (30) is less than or equal to the length of the second plate (20); and / or, The adhesive structure (30) includes thermally conductive filling adhesive.

9. The lithium battery protection board assembly according to any one of claims 1 to 8, characterized in that: The first plate (10) is a rigid plate, and the second plate (20) is a flexible plate; and / or The lithium battery protection board assembly further comprises an electronic component (13) arranged on the first board body (10), the electronic component (13) being electrically connected to the first board body (10), and the adhesive structure (30) covering the electronic component (13).

10. A lithium battery, characterized in that: A lithium battery protection plate assembly comprising any one of claims 1 to 9.

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