Lithium battery protection board, lithium battery and mobile terminal

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a lithium battery protection board, a lithium battery and a mobile terminal, which comprises a soft board and a hard board arranged on the soft board, the hard board comprises a first hard board arranged on the soft board and electrically connected with the soft board; the second hard board is connected to one side, far away from the soft board, of the first hard board; and the metal connector is fixedly connected between the first hard board and the second hard board, so that the first hard board and the second hard board are arranged in parallel. According to the lithium battery protection board disclosed by the utility model, the circulation of large current is realized by utilizing the metal connector, and the number of through holes in the hard board is reduced, so that the internal resistance is reduced, the heating is reduced, and the charge-discharge performance of the lithium battery protection board is improved; and the process is simple, and the production and manufacturing difficulty and cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a lithium battery protection board, a lithium battery, and a mobile terminal. Background Technology

[0002] With the continuous development of fast charging technology, the requirements for the overcurrent capacity of lithium battery protection boards are becoming increasingly stringent. In related technologies, lithium battery protection boards utilize through-holes between the layers to allow current to pass through. However, due to the limited overcurrent capacity of these through-holes, a large number of holes must be drilled between layers to achieve high current flow. This approach is complex, and the excessive number of through-holes increases the internal resistance between the layers, leading to overheating. Utility Model Content

[0003] In view of this, the present invention provides a lithium battery protection board, a lithium battery, and a mobile terminal to solve the problems of complex manufacturing process and high internal resistance of existing lithium battery protection boards.

[0004] In a first aspect, the present invention provides a lithium battery protection board, including a flexible board and a rigid board disposed on the flexible board; the rigid board includes: a first rigid board disposed on the flexible board and electrically connected to the flexible board; a second rigid board connected to the side of the first rigid board away from the flexible board; and a metal connector fixedly connected between the first rigid board and the second rigid board, so that the first rigid board and the second rigid board are arranged in parallel.

[0005] Optionally, a first plug portion is provided on the first rigid board, and a second plug portion is provided on the second rigid board; a metal connector is plugged into the first plug portion and the second plug portion, and is in contact with the first plug portion and the second plug portion for electrical connection.

[0006] Optionally, the first rigid board has two first surfaces disposed opposite to each other along a third direction, and the second rigid board has two second surfaces disposed opposite to each other along a third direction; the two first surfaces are respectively attached to the flexible board and one of the second surfaces; the first insertion portion and the second insertion portion are disposed opposite to each other along a third direction; wherein, the third direction is the thickness direction of the first rigid board and the thickness direction of the second rigid board.

[0007] Optionally, along a first direction, a first plug-in portion is disposed on the edge of at least one end of a first rigid plate, the first direction being the length direction of the first rigid plate; and / or, along the first direction, a second plug-in portion is disposed on the edge of at least one end of a second rigid plate; wherein, the first direction is the length direction of the second rigid plate.

[0008] Optionally, the first connector is a slot or a socket; and / or, the second connector is a slot or a socket.

[0009] Optionally, the flexible printed circuit board includes a first connecting portion and a second connecting portion connected to each other. The first connecting portion extends along a first direction, and a first rigid board is disposed on the first connecting portion. The second connecting portion extends along a second direction and is used to connect with a mobile terminal. The first direction and the second direction intersect.

[0010] Optionally, the lithium battery protection board also includes a connecting piece, which is located on opposite sides of the first connecting portion, and the connecting piece is fixedly connected to the first connecting portion.

[0011] Secondly, this utility model also provides a lithium battery, including: a battery cell having tabs; and a lithium battery protection board as described above, with a flexible board fixedly connected to the tabs.

[0012] Optionally, a groove is formed at the end of the battery cell near the tab, and the lithium battery protection board is disposed in the groove; or, the lithium battery protection board is disposed outside the battery cell and located above the battery cell.

[0013] Thirdly, this utility model also provides a mobile terminal, including: a lithium battery protection board as described above; or a lithium battery as described above.

[0014] This invention combines a flexible circuit board (FPCB) with a rigid circuit board (BPCB), with the first and second BPCBs connected in parallel via a metal connector. This solution enables high-current flow through the metal connector, improving current carrying capacity while reducing the number of through-holes within the BPCB, lowering internal resistance, reducing heat generation, and enhancing the charging and discharging performance of the lithium battery protection board. Furthermore, the process is simple, reducing manufacturing difficulty and cost. Attached Figure Description

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

[0016] Figure 1 This is a schematic diagram of the overall structure of a lithium battery protection board according to an embodiment of the present utility model;

[0017] Figure 2 This is an exploded view of a lithium battery protection board according to an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the assembly of a lithium battery protection board and a battery cell according to an embodiment of the present utility model;

[0019] Figure 4This is a partial exploded view of a lithium battery protection board and battery cell according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Lithium battery protection board; 11. Flexible board; 111. First connecting part; 112. Second connecting part; 113. Interface; 12. Rigid board; 121. First rigid board; 1211. First surface; 122. Second rigid board; 1221. Second surface; 123. Metal connector; 124. First insertion part; 125. Second insertion part; 13. Connecting piece; 14. Component; 2. Battery cell; 20. Groove; 21. Electrode; 22. Packaging shell; X, First direction; Y, Second direction; T, Third direction. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

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

[0024] According to an embodiment of the present invention, a lithium battery protection board 1 is provided, including a flexible board 11 and a rigid board 12 disposed on the flexible board 11. Specifically, the rigid board 12 includes a first rigid board 121, a second rigid board 122, and a metal connector 123. The first rigid board 121 is disposed on the flexible board 11 and electrically connected to the flexible board 11. The second rigid board 122 is connected to the side of the first rigid board 121 away from the flexible board 11. The metal connector 123 is fixedly connected between the first rigid board 121 and the second rigid board 122, so that the first rigid board 121 and the second rigid board 122 are arranged in parallel.

[0025] Using the technical solution of this utility model, the flexible board 11 and the rigid board 12 are combined, and the first rigid board 121 and the second rigid board 122 of the rigid board 12 are connected in parallel through a metal connector 123. This solution enables the flow of large current through the metal connector 123, which improves the current flow capacity, reduces the number of through holes inside the rigid board 12, reduces internal resistance, reduces heat generation, and improves the charging and discharging performance of the lithium battery protection board 1; moreover, the process is simple, reducing the difficulty and cost of production.

[0026] Understandably, the flexible board 11 is a flexible circuit board, also known as an FPC (Flexible Printed Circuit); the rigid board 12 is a printed circuit board, also known as a PCB (Printed Circuit Board).

[0027] In some embodiments, the metal connector 123 may be a pin, i.e., a pin.

[0028] The assembly process of the lithium battery protection board 1 in this solution is as follows: the flexible board 11 and the first rigid board 121 are packaged into an integral structure using SIP (System in Package) technology; the second rigid board 122 is connected to the first rigid board 121 through a metal connector 123 to form the lithium battery protection board 1. The first rigid board 121 provides support for the flexible board 11, and components 14 can be mounted on both the first and second rigid boards 122. The lithium battery protection board 1 manages the charging and discharging of the lithium battery through the components 14 on the first and second rigid boards 121 and 122.

[0029] In some embodiments, a first rigid board 121 is provided with a first insertion portion 124, and a second rigid board 122 is provided with a second insertion portion 125. A metal connector 123 is inserted between the first insertion portion 124 and the second insertion portion 125, and is in contact with both the first insertion portion 124 and the second insertion portion 125 for electrical connection. That is, the metal connector 123 is electrically connected to the first rigid board 121 through the first insertion portion 124 and to the second rigid board 122 through the second insertion portion 125, thereby realizing the parallel connection of the first rigid board 121 and the second rigid board 122. Using an insertion method simplifies the process and reduces production difficulty and costs.

[0030] Specifically, in some embodiments, the first rigid plate 121 has two first surfaces 1211 disposed opposite to each other along a third direction T, and the second rigid plate 122 has two second surfaces 1221 disposed opposite to each other along a third direction T. The third direction T is the thickness direction of both the first rigid plate 121 and the second rigid plate 122. The two first surfaces 1211 are respectively attached to the flexible plate 11 and one of the second surfaces 1221. That is, the first rigid plate 121 and the second rigid plate 122 are stacked along the third direction T.

[0031] Along the third direction T, the first insertion portion 124 and the second insertion portion 125 are arranged opposite to each other. With this arrangement, the first surface 1211 of the first rigid plate 121 and the second surface 1221 of the second rigid plate 122 are in contact, which facilitates the arrangement of the first insertion portion 124 and the second insertion portion 125; and the resulting lithium battery protection board has a compact structure, which can save space in the lithium battery and improve the energy density of the lithium battery during application.

[0032] The number of first plug-in portions 124 and second plug-in portions 125 depends on the number of metal connectors 123. Preferably, the number of first plug-in portions 124, second plug-in portions 125, and metal connectors 123 is the same. Of course, in some embodiments, the number of first plug-in portions 124, second plug-in portions 125, and metal connectors 123 may be different, and this utility model does not specifically limit this.

[0033] Furthermore, in some embodiments, along the first direction X, the first insertion portion 124 is disposed on the edge of at least one end of the first rigid plate 121, and a second insertion portion 125 is disposed corresponding to the first insertion portion 124 in the third direction T. Here, the first direction X is the length direction of the first rigid plate 121.

[0034] Alternatively, in some embodiments, along the first direction X, the second insertion portion 125 is disposed on the edge of at least one end of the second rigid plate 122, and the second insertion portion 125 is correspondingly disposed with the first insertion portion 124 in the third direction T. Here, the first direction X is the length direction of the second rigid plate 122.

[0035] Alternatively, in some embodiments, along the first direction X, at least one first insertion portion 124 is provided at each of the edges of the first rigid plate 121, and at least one second insertion portion 125 is provided at each of the edges of the second rigid plate 122. Furthermore, the first insertion portions 124 and second insertion portions 125 are correspondingly arranged in the third direction T. Here, the first direction X is the length direction of the first rigid plate 121 and the length direction of the second rigid plate 122; the third direction T is the thickness direction of the first rigid plate 121 and the thickness direction of the second rigid plate 122. The first direction X and the third direction T are perpendicular to each other.

[0036] In the above embodiments, since the width dimensions of the first rigid plate 121 and the second rigid plate 122 are relatively small, placing the first insertion portion 124 on the edge of the first rigid plate 121 along the length direction reduces the space occupied by the first rigid plate 121, thereby increasing the arrangement space for the components 14 and improving charging and discharging performance. Similarly, placing the second insertion portion 125 on the edge of the second rigid plate 122 along the length direction reduces the space occupied by the second rigid plate 122, thereby increasing the arrangement space for the components 14 and improving charging and discharging performance.

[0037] In some embodiments, the first plug-in portion 124 may be a slot or a socket.

[0038] In some embodiments, the second insertion portion 125 may be a slot or a socket.

[0039] The first plug-in portion 124 and the second plug-in portion 125 are configured as slots or sockets, which are easy to process and manufacture, and easy to connect with the metal connector 123.

[0040] For example, such as Figure 1 and 2 As shown, along the first direction X, the first insertion portion 124 is a slot and is disposed on the edge of the first rigid plate 121; the second insertion portion 125 is a socket and is disposed on the edge of the second rigid plate 122. The metal connector 123 is a pin, one end of which is fixed in the slot and the other end is fixed in the socket. Exemplarily, the two ends of the pin can be soldered or crimped into the slot and the socket respectively to achieve a fixed connection with the first rigid plate 121 and the second rigid plate 122.

[0041] In some embodiments, multiple metal connectors 123 are provided. For example, as shown... Figure 1 and 2 As shown, four metal connectors 123 are provided, and the four metal connectors 123 are respectively located at both ends of the first rigid plate 121 and the second rigid plate 122 along the first direction X.

[0042] Understandably, the metal connectors 123 can be provided in one, two, three, or other quantities. This utility model does not impose a specific limitation on the number of metal connectors 123, as long as the overcurrent requirements of the lithium battery protection board 1 are met.

[0043] In some embodiments, the lithium battery protection board 1 further includes a plurality of components 14, which are used to implement charge and discharge management of the lithium battery. The components 14 can be disposed on the first rigid board 121 or the second rigid board 122. Understandably, the components 14 are electrically connected to the flexible board 11 through the first rigid board 121, the second rigid board 122, and the metal connector 123, thereby achieving electrical connection with the lithium battery and the mobile terminal.

[0044] In some embodiments, the flexible circuit board 11 includes a first connecting portion 111 and a second connecting portion 112. The first connecting portion 111 extends along a first direction X, and a first rigid board 121 is disposed on the first connecting portion 111. The second connecting portion 112 extends along a second direction Y and is connected to the first connecting portion 111. The second connecting portion 112 is used to connect to a mobile terminal. The first direction X intersects the second direction Y. Preferably, the first direction X can be perpendicular to the second direction Y, that is, the first connecting portion 111 and the second connecting portion 112 are perpendicular to each other, and the first connecting portion 111 is parallel to the first rigid board 121 and the second rigid board 122, so as to reduce the space occupied by the lithium battery protection board 1 and increase the lithium battery capacity. It can be understood that the flexible circuit board 11, the first rigid board 121, and the second rigid board 122 are stacked sequentially in a third direction T, and the third direction T is perpendicular to both the first direction X and the second direction Y.

[0045] For example, such as Figure 1 and 2 As shown, two second connecting portions 112 are provided, each connected to one end of the first connecting portion 111 along the first direction X. The first rigid plate 121 and the second rigid plate 122 are connected to one side of the first connecting portion 111. The second connecting portions 112 are perpendicular to the first connecting portion 111, and an interface 113 is provided at the end of the second connecting portion 112 away from the first connecting portion 111. This interface 113 is used to connect to a mobile terminal to transmit electrical energy.

[0046] Understandably, the flexible circuit board 11 can also be configured with other structures. The specific structure of the flexible circuit board 11 depends on the arrangement of the lithium battery protection board 1 in the cell 2.

[0047] In some embodiments, the lithium battery protection board 1 further includes a connecting piece 13, which is located on opposite sides of the first connecting portion 111, and is fixedly connected to the first connecting portion 111. When the lithium battery protection board 1 is assembled into the battery cell 2, the connecting piece 13 is fixedly connected between the tab 21 of the battery cell 2 and the first connecting portion 111 to achieve an electrical connection between the battery cell 2 and the flexible board 11.

[0048] For example, the connecting piece 13 can be a nickel sheet or other conductive metal. For example, the connecting piece 13 can be constructed in a "U" shape, "L" shape, or other shapes, and the specific structure of the connecting piece 13 depends on the shape of the electrode 21 and the positional relationship between the electrode 21 and the flexible board 11. For example, the connecting piece 13 and the electrode 21 can be fixedly connected by welding, bonding, or other methods, and the connecting piece 13 and the first connecting part 111 can also be fixedly connected by welding, bonding, or other methods.

[0049] Understandably, the tabs 21 of the battery cell 2 include a positive tab and a negative tab. Correspondingly, there are two connecting pieces 13, which are used to fix and connect to the positive tab and the negative tab respectively.

[0050] According to an embodiment of the present invention, another aspect provides a lithium battery, including a cell 2 and a lithium battery protection board 1 as described in the above embodiments. Specifically, the cell 2 has tabs 21, and the lithium battery protection board 1 includes a flexible board 11 and a rigid board 12 disposed on the flexible board 11, the flexible board 11 being fixedly connected to the tabs 21. Since the lithium battery of the present invention includes the above-described lithium battery protection board 1, it has the same technical effects as the lithium battery protection board 1 of the present invention, and will not be described again here.

[0051] Furthermore, the flexible circuit board 11 of the lithium battery protection board 1 can be directly connected to the tab 21, or indirectly connected through other structures. In some embodiments, the lithium battery protection board 1 includes the aforementioned connecting piece 13, and the flexible circuit board 11 is fixedly connected to the tab 21 of the cell 2 through the connecting piece 13.

[0052] In some embodiments, a groove 20 is formed at one end of the battery cell 2 near the tab 21, and the lithium battery protection board 1 is disposed within the groove 20. Specifically, as shown in the figure... Figure 3 and 4 As shown, the battery cell 2 includes a bare battery cell 2 and a packaging shell 22. A tab 21 extends from the head of the bare battery cell 2, and the bare battery cell 2 is encapsulated within the packaging shell 22. The packaging shell 22 protrudes from the head of the bare battery cell 2 and forms the aforementioned groove 20 at the head of the bare battery cell 2. A lithium battery protection plate 1 is vertically arranged within this groove 20.

[0053] In actual assembly, the connecting piece 13 is welded to the tab 21, the lithium battery protection board 1 is placed in the groove 20, and the connecting piece 13 is welded to the flexible board 11 to form a lithium battery.

[0054] Alternatively, in some embodiments not shown, the lithium battery protection plate 1 is disposed outside the battery cell 2 and located above the battery cell 2. Specifically, the battery cell 2 includes a bare battery cell 2 and a packaging shell 22. The head of the bare battery cell 2 has a tab 21 extending out, and the bare battery cell 2 is encapsulated within the packaging shell 22. The packaging shell 22 protrudes from the head of the bare battery cell 2, and the protruding portion is bent at 90° to form a flat structure at the head of the bare battery cell 2. The lithium battery protection plate 1 is disposed on the flat structure formed by the packaging shell 22, that is, above the packaging shell 22.

[0055] Understandably, the packaging shell 22 can be an aluminum-plastic shell, in which the bare battery cell 2 is encapsulated by a packaging process, forming the aforementioned groove 20 or a flat structure.

[0056] In some embodiments, the lithium battery further includes a plastic component disposed at the head of the cell 2 and covering the lithium battery protection plate 1 to provide insulation and protection. Exemplarily, the plastic component can be formed on the outside of the lithium battery protection plate 1 by low-pressure injection molding. Exemplarily, the plastic component can be adhesive tape, bonded to the outside of the lithium battery protection plate 1.

[0057] According to an embodiment of the present invention, in another aspect, a mobile terminal is also provided, including a lithium battery protection board 1 as described in the above embodiments; or, including a lithium battery as described in the above embodiments. Since the mobile terminal of the present invention includes the above-described lithium battery protection board 1, it has the same technical effects as the lithium battery protection board 1 of the present invention, and will not be described again here.

[0058] Understandably, the mobile terminal of this utility model includes, but is not limited to, electronic devices such as mobile phones, computers, tablets, and electronic watches.

[0059] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A lithium battery protection board, characterized in that, Includes a flexible board (11) and a rigid board (12) disposed on the flexible board (11); the rigid board (12) includes: A first rigid plate (121) is disposed on the flexible plate (11) and electrically connected to the flexible plate (11); The second rigid plate (122) is connected to the side of the first rigid plate (121) away from the flexible plate (11); A metal connector (123) is fixedly connected between the first rigid plate (121) and the second rigid plate (122) so that the first rigid plate (121) and the second rigid plate (122) are arranged in parallel.

2. The lithium battery protection board according to claim 1, characterized in that, The first rigid plate (121) is provided with a first plug-in portion (124), and the second rigid plate (122) is provided with a second plug-in portion (125); the metal connector (123) is plugged between the first plug-in portion (124) and the second plug-in portion (125), and is in contact with the first plug-in portion (124) and the second plug-in portion (125) for electrical connection.

3. The lithium battery protection board according to claim 2, characterized in that, The first rigid plate (121) has two first surfaces (1211) arranged opposite each other along a third direction (T), and the second rigid plate (122) has two second surfaces (1221) arranged opposite each other along a third direction (T); the two first surfaces (1211) are respectively attached to the flexible plate (11) and one of the second surfaces (1221); Along a third direction (T), the first plug-in portion (124) and the second plug-in portion (125) are arranged opposite to each other; Wherein, the third direction (T) is the thickness direction of the first rigid plate (121) and the thickness direction of the second rigid plate (122).

4. The lithium battery protection board according to claim 3, characterized in that, Along a first direction (X), the first insertion portion (124) is disposed on the edge of at least one end of the first rigid plate (121); wherein, the first direction (X) is the length direction of the first rigid plate (121); and / or, Along a first direction (X), the second insertion portion (125) is disposed on the edge of at least one end of the second rigid plate (122); wherein the first direction (X) is the length direction of the second rigid plate (122).

5. The lithium battery protection board according to claim 4, characterized in that, The first plug-in portion (124) is a slot or a socket; and / or, the second plug-in portion (125) is a slot or a socket.

6. The lithium battery protection board according to claim 1, characterized in that, The flexible board (11) includes a first connecting part (111) and a second connecting part (112) connected to each other. The first connecting part (111) extends along a first direction (X), and the first rigid board (121) is disposed on the first connecting part (111). The second connecting part (112) extends along a second direction (Y) and is used to connect with a mobile terminal. Wherein, the first direction (X) intersects with the second direction (Y).

7. The lithium battery protection board according to claim 6, characterized in that, The lithium battery protection board (1) also includes a connecting piece (13), which is located on opposite sides of the first connecting part (111) and the first rigid plate (121), and the connecting piece (13) is fixedly connected to the first connecting part (111).

8. A lithium battery, characterized in that, include: The battery cell (2) has tabs (21); The lithium battery protection board (1) as described in any one of claims 1-7, wherein the flexible board (11) is fixedly connected to the tab (21).

9. The lithium battery according to claim 8, characterized in that, The battery cell (2) has a groove (20) formed at one end near the tab (21), and the lithium battery protection board (1) is disposed in the groove (20); or, The lithium battery protection board (1) is disposed outside the battery cell (2) and located above the battery cell (2).

10. A mobile terminal, characterized in that, include: The lithium battery protection board (1) as described in any one of claims 1 to 7; Alternatively, the lithium battery as described in claim 8 or 9.

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