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 plate, a lithium battery and a mobile terminal, and the lithium battery protection plate comprises a first protection plate which is provided with two first surfaces oppositely arranged along a first direction and a first side surface connected between the two first surfaces; the second protection plate is electrically connected with the battery cell; the second protection plate is provided with two second surfaces oppositely arranged in the second direction and a second side face connected between the two second surfaces. The second protection plate is located on one side of the first protection plate in the first direction. And the first connecting piece is fixedly connected between one of the first surfaces and the second side surface and enables the first protection plate to be electrically connected with the second protection plate. The first direction is the thickness direction of the first protection plate, and the second direction is the thickness direction of the second protection plate; the first direction intersects the second direction. The first protection plate and the second protection plate jointly perform charge and discharge management on the lithium battery and are arranged at the included angle, so that the electrical property is improved, and the heat dissipation effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, concretely relates to a lithium battery protection board, lithium battery and mobile terminal. BACKGROUND

[0002] With the continuous development of the battery fast charging technology, the performance requirement of the lithium battery protection board is higher and higher. In some technical solutions, the lithium battery protection board adopts one circuit board, and the electrical performance is poor. In some technical solutions, the lithium battery protection board adopts the mode that a plurality of circuit boards are stacked, although the electrical performance is improved, but the heat dissipation effect of the lithium battery protection board is poor. SUMMARY

[0003] Therefore, the utility model provides a lithium battery protection board, lithium battery and mobile terminal to solve the problem that the lithium battery protection board is difficult to improve the electrical performance and the heat dissipation effect.

[0004] In a first aspect, the utility model provides a lithium battery protection board, which comprises: a first protection board having two first surfaces oppositely arranged along a first direction and a first side surface connected between the two first surfaces; a second protection board for electrically connecting with a battery cell; the second protection board has two second surfaces oppositely arranged along a second direction and a second side surface connected between the two second surfaces; the second protection board is located on one side of the first protection board along the first direction; a first connecting piece is fixedly connected between one of the first surfaces of the first protection board and the second side surface of the second protection board, and the first protection board and the second protection board are electrically connected; wherein the first direction is the thickness direction of the first protection board, the second direction is the thickness direction of the second protection board, and the first direction intersects the second direction.

[0005] Optionally, the side of the first connecting piece facing the second protection board is provided with a groove, and at least part of the structure of the second protection board is embedded in the groove.

[0006] Optionally, the first connecting piece comprises a first connecting part and a second connecting part, the first connecting part is attached to the first surface and connected; the second connecting part is connected to the side of the first connecting part away from the first surface, and the second connecting part is bent and formed into a groove.

[0007] Optionally, the lithium battery protection board further comprises a flexible piece, the flexible piece is connected to the side of the first protection board away from the second protection board and connected to the first surface.

[0008] Optionally, the side of the flexible piece away from the first protection board is provided with an adhesive layer.

[0009] Optionally, the lithium battery protection board further comprises a connector, the connector is electrically connected with the second protection board, and the connector is used for electrically connecting with a mobile terminal.

[0010] Optionally, the lithium battery protection plate further comprises a third connecting piece, the third connecting piece and the connector are connected with the two second surfaces of the second protection plate respectively; the second protection plate is connected with the battery cell through the third connecting piece.

[0011] In a second aspect, the utility model also provides a lithium battery, include: battery cell;The lithium battery protection plate as described above;The second protection plate is electrically connected with the battery cell, and the first protection plate is located between the battery cell and the second protection plate along the third direction;Wherein, the third direction is parallel with the first direction.

[0012] Optionally, the battery cell has a first end and a second end oppositely arranged along the third direction, and the first end is formed with a mounting groove; the lithium battery protection plate is arranged in the mounting groove.

[0013] Optionally, the lithium battery further comprises a plastic part, the plastic part is wrapped on the outer side of the lithium battery protection plate, and at least part of the structure of the battery cell is wrapped.

[0014] In a third aspect, the utility model also provides a mobile terminal, comprising: the lithium battery protection plate as described above;Or, the lithium battery as described above.

[0015] By the technical scheme of the utility model, the first protection plate and the second protection plate are electrically connected through the first connecting piece, the first protection plate and the second protection plate jointly manage the charging and discharging of the lithium battery, and the electrical performance is improved;And, the thickness directions of the first protection plate and the second protection plate intersect, that is, the first protection plate and the second protection plate are arranged at an angle, compared with the laminated arrangement, the heat dissipation area is greatly increased, and the heat dissipation effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0017] Figure 1 It is a structure schematic view of the lithium battery protection plate of the utility model embodiment;

[0018] Figure 2 It is an explosion view of the lithium battery protection plate of the utility model embodiment;

[0019] Figure 3 It is a structure schematic view of the lithium battery of the utility model embodiment;

[0020] Figure 4 It is an explosion view of the lithium battery of the utility model embodiment.

[0021] Figure 5 A partial structure schematic view of a lithium battery according to an embodiment of the present application;

[0022] Figure 6 A top view of a lithium battery along a third direction and a partial enlarged view thereof according to an embodiment of the present application.

[0023] Explanation of reference signs:

[0024] 1, lithium battery protection plate; 11, first protection plate; 111, first surface; 112, first side; 12, second protection plate; 121, second surface; 122, second side; 13, first connecting piece; 131, first connecting part; 132, second connecting part; 133, groove; 14, flexible piece; 15, connector; 16, second connecting piece; 17, third connecting piece; 18, component; 2, battery cell; 2a, first end; 2b, second end; 21, mounting groove; 22, main body part; 23, extension part; 24, tab; 3, plastic piece; T1, first direction; T2, second direction; H, third direction; L, fourth direction. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] The embodiments of the present application will be described below in combination with Figures 1 to 6 .

[0027] According to the embodiments of the present application, on the one hand, a lithium battery protection plate 1 is provided, such as Figure 1 and Figure 2As shown, the lithium battery protection plate 1 includes a first protection plate 11, a second protection plate 12 and a first connecting piece 13. Specifically, the first protection plate 11 has two first surfaces 111 oppositely arranged along a first direction T1 and a first side surface 112 connected between the two first surfaces 111. The second protection plate 12 is used to be electrically connected with the battery cell 2, and the second protection plate 12 has two second surfaces 121 oppositely arranged along a second direction T2 and a second side surface 122 connected between the two second surfaces 121. The second protection plate 12 is located at one side of the first protection plate 11 along the first direction T1. Among them, the first direction T1 is the thickness direction of the first protection plate 11, and the second direction T2 is the thickness direction of the second protection plate 12. The first direction T1 intersects the second direction T2, that is, the thickness direction of the first protection plate 11 intersects the thickness direction of the second protection plate 12, so that the first protection plate 11 and the second protection plate 12 are arranged at an included angle.

[0028] Further, the first connecting piece 13 is fixedly connected between the first protection plate 11 and the second protection plate 12, and electrically connects the first protection plate 11 and the second protection plate 12. Specifically, the first connecting piece 13 is fixedly connected between one of the first surfaces 111 of the first protection plate 11 and the second side surface 122 of the second protection plate 12.

[0029] By using the technical scheme of the utility model, the first protection plate 11 and the second protection plate 12 are electrically connected through the first connecting piece 13, the first protection plate 11 and the second protection plate 12 jointly manage the charging and discharging of the lithium battery, and the electrical performance is improved. Moreover, the thickness directions of the first protection plate 11 and the second protection plate 12 intersect, that is, the first protection plate 11 and the second protection plate 12 are arranged at an included angle, compared with the laminated arrangement, the heat dissipation area is greatly increased, and the heat dissipation effect is improved.

[0030] It should be noted that the included angle between the first direction T1 and the second direction T2 can be any angle between 0-180°, that is, the included angle between the first protection plate 11 and the second protection plate 12 can be any angle between 0-180°, and the utility model does not make specific limitation on this, as long as the arrangement requirement in space is met.

[0031] In some embodiments, the angle between the first direction T1 and the second direction T2 is 90°, that is, the first direction T1 and the second direction T2 are perpendicular to each other, so that the first protection plate 11 and the second protection plate 12 are perpendicular to each other, so as to maximize the heat dissipation effect of the lithium battery protection plate 1; and the first protection plate 11 and the second protection plate 12 are perpendicular to each other, compared with the technical solution that the first protection plate 11 and the second protection plate 12 are arranged at an acute angle or an obtuse angle, the components 18 mounted on the second protection plate 12 are not blocked, the components 18 are easier to package, and the contact area between the components 18 and the packaging structure (such as the plastic part 3) is larger, improving the reliability of the components 18.

[0032] Exemplarily, as shown in Figure 1 and Figure 2 , the first protection plate 11 and the second protection plate 12 are both rectangular plate structures, the first direction T1 and the second direction T2 are perpendicular to each other, and the length direction of the first protection plate 11 and the length direction of the second protection plate 12 are both the fourth direction L, which is perpendicular to the first direction T1 and the second direction T2. Specifically, the second side surface 122 includes two second long side surfaces extending along the fourth direction L and two second short side surfaces connected between the two second long side surfaces. Understandably, the two second long side surfaces are oppositely arranged along the width direction of the second protection plate 12, and the two second short side surfaces are oppositely arranged along the length direction of the second protection plate 12, that is, the fourth direction L. Among them, the second long side surface is parallel to the first surface 111 of the first protection plate 11, and the second short side surface is perpendicular to the first surface 111.

[0033] Understandably, the first protection plate 11 and the second protection plate 12 are both circuit boards, and a plurality of components 18 are arranged on the first protection plate 11 and the second protection plate 12 to realize the charge and discharge management of the lithium battery. Among them, the first protection plate 11 and the second protection plate 12 can be hard boards (Printed Circuit Board, abbreviated as PCB), or soft boards (Flexible Printed Circuit, abbreviated as FPC), preferably hard boards. Exemplarily, the first protection plate 11 can be arranged in parallel with the second protection plate 12 through the first connecting piece 13, so as to reduce the internal resistance of the lithium battery protection plate 1 and improve the overall performance of the lithium battery protection plate 1. Exemplarily, part of the components 18 are arranged on the second protection plate 12, and the second protection plate 12 is electrically connected with the battery cell 2; part of the components 18 are arranged on the first protection plate 11 to strengthen the function of the lithium battery.

[0034] In some embodiments not shown, the first protection plate 11 can also be provided as a plurality of independent first protection plate units arranged side by side in the fourth direction L. Each first protection plate unit has two first surfaces 111 arranged oppositely in the first direction T1 and a first side surface 112 connected between the two first surfaces 111. The second protection plate 12 is arranged perpendicularly to one side of the plurality of first protection plate units in the first direction T1, and the second side surface 122 of the second protection plate 12 is connected to the first surfaces 111 of the plurality of first protection plate units by the first connecting piece 13, so that the second protection plate 12 and the plurality of first protection plate units are connected as an integrated structure and achieve electrical connection. It can be understood that the first direction T1 is the thickness direction of the first protection plate unit.

[0035] In some embodiments not shown, the second protection plate 12 can also be provided as a plurality of independent second protection plate units arranged side by side in the fourth direction L and perpendicularly to the first protection plate 11. Each second protection plate unit has two second surfaces 121 arranged oppositely in the second direction T2 and a second side surface 122 connected between the two second surfaces 121. The second side surface 122 of the plurality of second protection plate units is fixedly connected to the first surface 111 of the first protection plate 11 by the first connecting piece 13, so that the plurality of second protection plate units and the first protection plate 11 are connected as an integrated structure and achieve electrical connection. It can be understood that the second direction T2 is the thickness direction of the second protection plate unit.

[0036] It can be understood that the first connecting piece 13 is a metal piece and has electrical conductivity. For example, the first connecting piece 13 and the first protection plate 11 can be fixedly connected by welding, bonding or the like. For example, the second connecting piece 16 and the second protection plate 12 can be fixedly connected by welding, bonding, crimping or the like.

[0037] In some embodiments, the side of the first connecting piece 13 facing the second protection plate 12 is provided with a groove 133, and at least part of the structure of the second protection plate 12 is embedded in the groove 133. The groove 133 of the first connecting piece 13 can position the second protection plate 12 and improve the stability of the connection between the second protection plate 12 and the first protection plate 11. It can be understood that in this embodiment, at least part of the structure of one of the second long side surfaces of the second protection plate 12, the two second short side surfaces connected thereto, and the two second surfaces 121 are also located in the groove 133 and connected with the groove 133, which ensures the reliability of the connection between the first connecting piece 13 and the second protection plate 12.

[0038] Specifically, in some embodiments, the first connecting member 13 comprises a first connecting portion 131 and a second connecting portion 132. The first connecting portion 131 is attached to the first surface 111. The second connecting portion 132 is connected to a side of the first connecting portion 131 away from the first surface 111, i.e. a side of the first connecting portion 131 facing the second protective plate 12. The second connecting portion 132 is bent and forms the groove 133. The first connecting member 13 is formed by the first connecting portion 131 and the second connecting portion 132, which is simple in structure and easy to manufacture.

[0039] In this embodiment, the first connecting portion 131 and the second connecting portion 132 can be made of sheet material, i.e. the first connecting portion 131 and the second connecting portion 132 can be plate-shaped structures. The first connecting portion 131 can be a flat plate, and the second connecting portion 132 can be bent on both sides to form a "U"-shaped groove, i.e. the groove 133. Exemplarily, the second connecting portion 132 can be connected to the middle of the side of the first connecting portion 131 facing the second protective plate 12.

[0040] Exemplarily, along the first direction T1, the bottom of the first connecting portion 131 can be welded to the first surface 111 of the first protective plate 11, and the top can be welded to the second connecting portion 132. The groove 133 of the second connecting portion 132 has an opening facing the second protective plate 12, and part of the structure of the second protective plate 12 is embedded in the groove 133 and welded to the inner wall of the groove 133. The part of the structure of the second protective plate 12 embedded in the groove 133 specifically includes one of the second long sides and part of the structure near the second long side. The first connecting portion 131, the second connecting portion 132, the first protective plate 11, and the second protective plate 12 are connected by welding, which has high structural strength and reliability.

[0041] In some embodiments not shown, the first connecting member 13 can also be a one-piece structure, such as a block structure, and the groove 133 is formed on the side of the block structure facing the second protective plate 12.

[0042] In other embodiments not shown, the surface of the first connecting member 13 facing the second protective plate 12 can also be a plane, and the first connecting member 13 can be configured as a block structure, a flat plate structure, a long strip structure, etc. The first protective plate 11 and the second protective plate 12 are respectively fixedly connected to opposite sides of the first connecting member 13.

[0043] In yet other embodiments not shown, the first connecting member 13 can comprise a plurality of third connecting portions, which are spaced apart and fixedly connected between the first protective plate 11 and the second protective plate 12.

[0044] It can be understood that the second protection plate 12, the first connecting piece 13 and the first protection plate 11 are sequentially arranged in the first direction T1.

[0045] It should be noted that in the first direction T1, the projection of the first connecting piece 13 should be located in the projection of the first protection plate 11. And in the first direction T1, the projection of the second protection plate 12 is also located in the projection of the first protection plate 11, so as to ensure the compactness of the structure of the lithium battery protection plate 1.

[0046] In some embodiments, the lithium battery protection plate 1 further comprises a flexible piece 14, which is located on the side of the first protection plate 11 away from the second protection plate 12 and connected with the first surface 111. When the lithium battery protection plate 1 is installed into the battery cell 2, the flexible piece 14 can play a buffering role between the first protection plate 11 and the battery cell 2. By arranging the flexible piece 14 on the first protection plate 11, the process of assembling the gasket in the battery cell 2 is saved, and the production process and cost are simplified. Exemplarily, the flexible piece 14 can be a silica gel gasket. Exemplarily, the flexible piece 14 can be bonded to the first protection plate 11 by an adhesive.

[0047] In some embodiments, the side of the flexible piece 14 away from the first protection plate 11 is provided with an adhesive layer, which can be bonded to the battery cell 2 through the adhesive layer on the flexible piece 14 when the lithium battery protection plate 1 is installed into the battery cell 2, so that the lithium battery protection plate 1 is fixed on the battery cell 2, the packaging process of the lithium battery is simplified, the production efficiency is improved, and the production cost is reduced. Exemplarily, the adhesive layer can be double-sided tape or other adhesives.

[0048] In some embodiments, the lithium battery protection plate 1 further comprises a connector 15, which is electrically connected with the second protection plate 12 and used to be electrically connected with the mobile terminal. Exemplarily, as shown in Figure 1 and 2 The connector 15 is connected with the connector 15 through a second connecting piece 16, which includes mechanical connection and electrical connection. Exemplarily, the second connecting piece 16 can be a flexible circuit board, i.e. a soft board. Exemplarily, the second connecting piece 16 can be substantially configured as an "L" shape, and the second connecting piece 16 is located on the side of the second protection plate 12 along the second direction T2. The horizontal segment of the "L" shape is connected with one of the second surfaces 121 of the second protection plate 12; the vertical segment extends towards the side away from the first protection plate 11, and the connector 15 is arranged on the vertical segment. The horizontal segment of the "L" shape extends in the fourth direction L, and the vertical segment extends in the first direction T1. Exemplarily, the second connecting piece 16 can also be configured as a "one" character shape or other structures.

[0049] In some embodiments, the lithium battery protection plate 1 further comprises a third connecting piece 17, the third connecting piece 17 and the connector 15 are connected with two second surfaces 121 of the second protection plate 12 respectively, and specifically, the connector 15 is connected with the second surface 121 through the second connecting piece 16. The second protection plate 12 is connected with the battery cell 2 through the third connecting piece 17, and the connection comprises mechanical connection and electrical connection. Specifically, as shown in Figure 6 The battery cell 2 has a tab 24, and the third connecting piece 17 is fixedly connected between the tab 24 and the second surface 121 of the second protection plate 12. The third connecting piece 17 and the second connecting piece 16 are located on two sides of the second direction T2 of the second protection plate 12 respectively, and the structure is compact and the occupied space is reduced. Exemplarily, the third connecting piece 17 can be a nickel sheet or other conductive metal; the third connecting piece 17 can be fixedly connected between the second surface 121 and the tab 24 through laser welding or the like. Exemplarily, the third connecting piece 17 can be configured as a "U" shape, a plate structure or the like. Understandably, the tab 24 includes a positive tab and a negative tab, and correspondingly, two third connecting pieces 17 are provided, and the two third connecting pieces 17 are connected with the positive tab and the negative tab of the battery cell 2 respectively.

[0050] The assembly process of the lithium battery protection plate 1 of the utility model is as follows: the first protection plate 11 and the second protection plate 12 are welded into an integrated structure through the first connecting piece 13; the flexible piece 14 is bonded on the side of the first protection plate 11 away from the second protection plate 12 along the first direction T1, and the side of the flexible piece 14 away from the first protection plate 11 along the first direction T1 is provided with a bonding layer; and the connector 15 is arranged on the second protection plate 12 through the second connecting piece 16 to realize electrical connection between the mobile terminal and the lithium battery protection plate 1.

[0051] Understandably, the lithium battery protection plate 1 of the utility model is an integrated structure, which can be placed on the battery cell 2 as a whole and fixed to the battery cell 2 through the bonding layer on the flexible piece 14.

[0052] According to the embodiments of the utility model, on the other hand, a lithium battery is also provided, as shown in Figures 3 to 5 The lithium battery comprises the battery cell 2 and the lithium battery protection plate 1 described in the above embodiments, wherein the second protection plate 12 of the lithium battery protection plate 1 is electrically connected with the battery cell 2, and the first protection plate 11 is located between the battery cell 2 and the second protection plate 12 along a third direction H. The third direction H is parallel to the first direction T1. The third direction H is usually the height direction of the battery cell 2. Since the lithium battery of the utility model comprises the above lithium battery protection plate 1, it has the same technical effects as the lithium battery protection plate 1 of the utility model, and will not be described here.

[0053] Specifically, as shown in Figure 5 And Figure 6As shown, one side of the second protection plate 12 along the second direction T2 is connected with the tab 24 of the battery cell 2, specifically connected with the tab 24 through the third connecting piece 17 described above. The second side surface 122 of the second protection plate 12 is connected with one of the first surfaces 111 of the first protection plate 11 through the first connecting piece 13.

[0054] In some embodiments, the lithium battery protection plate 1 includes the flexible piece 14 and the adhesive layer described above, and the lithium battery protection plate 1 can be fixed on the battery cell 2 through the adhesive layer on the flexible piece 14, which simplifies the packaging process of the lithium battery, improves the production efficiency, and reduces the production cost.

[0055] In some embodiments, along the third direction H, the battery cell 2 has oppositely arranged first and second ends 2a and 2b, the first end 2a is formed with a mounting groove 21, and the lithium battery protection plate 1 is arranged in the mounting groove 21. Among them, the first protection plate 11 and the second protection plate 12 of the lithium battery protection plate 1 are arranged at an angle, that is, the first direction T1 and the second direction T2 intersect, preferably perpendicular to each other, which can make full use of the mounting space of the mounting groove 21, avoid space waste, and further improve the performance of the lithium battery.

[0056] Specifically, the battery cell 2 includes a main body part 22 and an extension part 23, the extension part 23 is connected to one end of the main body part 22 along the third direction H, specifically the extension part 23 is connected to one end of the main body part 22 close to the first end 2a; and the end surface of the main body part 22 at the first end 2a and the extension part 23 jointly enclose the mounting groove 21 described above. The lithium battery protection plate 1 is mounted in the mounting groove 21, specifically bonded to the end surface of the main body part 22 at the first end 2a through the adhesive layer on the flexible piece 14, and the extension part 23 is arranged outside the flexible piece 14, the first protection plate 11 and the second protection plate 12.

[0057] As can be understood, the battery cell 2 includes a bare battery cell and a packaging shell, the bare battery cell is packaged in the packaging shell, and the bare battery cell and the packaging shell jointly form the main body part 22, and the edge structure of the packaging shell at the first end 2a forms the extension part 23. The tab 24 extends out of the bare battery cell, and at least part of the structure of the tab 24 extends into the extension part 23 or extends out of the packaging shell through the extension part 23. The packaging shell is usually formed by an aluminum plastic film after packaging process.

[0058] In some embodiments, the lithium battery protection plate 1 further includes the third connecting piece 17 described above, the third connecting piece 17 is located in the mounting groove 21 and fixedly connected between the tab 24 and the second surface 121 of the second protection plate 12.

[0059] In some embodiments, the lithium battery further comprises a plastic member 3, the plastic member 3 is wrapped on the outer side of the lithium battery protection plate 1 and wraps at least part of the structure of the battery cell 2. In this embodiment, part of the structure of the plastic member 3 can be fixed to the battery cell 2, and part of the structure is fixed to the lithium battery protection plate 1, so as to realize the integration of the battery cell 2 and the lithium battery protection plate 1, and further simplify the head packaging process of the lithium battery.

[0060] It can be understood that the plastic member 3 is used for insulating and protecting the lithium battery protection plate 1, therefore, the plastic member 3 can not completely cover the lithium battery protection plate 1, as long as the insulating function between the lithium battery protection plate 1 and the mobile terminal can be realized. As shown in the figure, at least part of the structure of the second connecting member 16 of the lithium battery protection plate 1 and the connector 15 should be exposed outside the plastic member 3, so as to be connected with the mobile terminal. Figure 3

[0061] Exemplarily, the plastic member 3 can be formed on the first end 2a of the lithium battery by using a low-pressure injection molding process. Exemplarily, the plastic member 3 can be formed by using a glue paper, the glue paper is bonded to the first end 2a of the lithium battery. Exemplarily, the plastic member 3 can also be formed by using a heat-conducting glue, the heat-conducting glue is partially encapsulated on the first end 2a of the lithium battery.

[0062] In some embodiments not shown, the end surface of the first end 2a of the battery cell 2 can also be a plane structure, that is, the first end 2a of the battery cell 2 is not provided with the mounting groove 21, and the lithium battery protection plate 1 is bonded to the plane structure by the bonding layer of the flexible member 14.

[0063] According to the embodiments of the present application, on the other hand, a mobile terminal is also provided, which comprises the lithium battery protection plate 1 described in the above embodiments, or comprises the lithium battery described in the above embodiments. Since the mobile terminal of the present application comprises the above lithium battery protection plate 1, it has the same technical effects as the lithium battery protection plate 1 of the present application, which will not be described here.

[0064] It can be understood that the mobile terminal of the present application includes but is not limited to mobile phones, computers, tablets, electronic watches and other electronic devices.

[0065] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.​

Claims

1. A lithium battery protection plate, characterized in that, The lithium battery protection plate (1) comprises: a first protection plate (11) having two first surfaces (111) oppositely arranged along a first direction (T1) and a first side surface (112) connected between the two first surfaces (111); a second protection plate (12) for electrically connecting with a battery cell (2); the second protection plate (12) has two second surfaces (121) oppositely arranged along a second direction (T2) and a second side surface (122) connected between the two second surfaces (121); the second protection plate (12) is located on one side of the first protection plate (11) along the first direction (T1); a first connecting piece (13) fixedly connected between one of the first surfaces (111) of the first protection plate (11) and the second side surface (122) of the second protection plate (12) and electrically connecting the first protection plate (11) with the second protection plate (12); wherein the first direction (T1) is the thickness direction of the first protection plate (11), the second direction (T2) is the thickness direction of the second protection plate (12), and the first direction (T1) intersects the second direction (T2).

2. The lithium battery protection plate of claim 1, wherein, The side of the first connecting piece (13) facing the second protection plate (12) is provided with a groove (133), and at least part of the structure of the second protection plate (12) is embedded in the groove (133).

3. The lithium battery protection plate of claim 2, wherein, The first connecting piece (13) comprises a first connecting portion (131) and a second connecting portion (132); the first connecting portion (131) is attached to and connected with the first surface (111); the second connecting portion (132) is connected to the side of the first connecting portion (131) away from the first surface (111), and is arranged in a bent manner and forms the groove (133).

4. The lithium battery protection plate according to any one of claims 1-3, characterized in that, The lithium battery protection plate (1) further comprises a flexible piece (14) located on the side of the first protection plate (11) away from the second protection plate (12) and connected with the first surface (111).

5. The lithium battery protection plate of claim 4, wherein, The side of the flexible piece (14) away from the first protection plate (11) is provided with an adhesive layer.

6. The lithium battery protection plate according to any one of claims 1-3, wherein, The lithium battery protection plate (1) further comprises a connector (15) electrically connected with the second protection plate (12) and used for electrically connecting with a mobile terminal.

7. The lithium battery protection plate of claim 6, wherein, The lithium battery protection plate (1) further comprises a third connecting piece (17); the third connecting piece (17) and the connector (15) are respectively connected with the two second surfaces (121) of the second protection plate (12); and the second protection plate (12) is connected with the battery cell (2) through the third connecting piece (17).

8. A lithium battery, characterized by The lithium battery protection plate (1) comprises: a battery cell (2); a lithium battery protection plate (1) according to any one of claims 1-7; the second protection plate (12) is electrically connected with the battery cell (2), and the first protection plate (11) is located between the battery cell (2) and the second protection plate (12) along a third direction (H); wherein the third direction (H) is parallel to the first direction (T1).

9. The lithium battery of claim 8, wherein, The electric core (2) has a first end (2a) and a second end (2b) oppositely arranged along a third direction (H), and the first end (2a) is formed with a mounting groove (21); the lithium battery protection plate (1) is arranged in the mounting groove (21).

10. The lithium battery according to claim 8 or 9, characterized in that, The lithium battery further comprises a plastic part (3) which is wrapped on the outer side of the lithium battery protection plate (1) and wraps at least part of the structure of the electric core (2).

11. A mobile terminal, characterized by Comprise: The lithium battery protection plate (1) according to any one of claims 1-7; Or the lithium battery according to any one of claims 8-10.

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