Protective plate assembly and battery

Abstract

The utility model relates to the field of battery structures, in particular to a protection plate assembly and a battery. The protection plate assembly is used for being connected with a tab of a battery cell and comprises a flexible circuit board, an electronic device and a vapor chamber, the flexible circuit board comprises a first connecting part, and the width direction of the first connecting part is parallel to the length direction of the battery cell; the tab and the electronic device are both connected with one side of the first connecting part, and the vapor chamber is connected with the other side of the first connecting part. According to the protection plate assembly provided by the invention, a printed circuit board is omitted, the tab and the electronic device are connected with the flexible circuit board, and the flexible circuit board is used for replacing the printed circuit board, so that the width of the flexible circuit board can be reduced, and the packaging length of the battery is correspondingly reduced. And the vapor chamber is arranged to be connected with the flexible circuit board, so that the problem that the temperature rise is increased due to the fact that the width of the flexible circuit board is reduced is solved, and the vapor chamber can also play a role in supporting the flexible circuit board.

Description

Technical Field

[0001] The present application relates to the field of battery structures, and particularly to a protection board assembly and a battery. Background Art

[0002] At present, the increase in the display size of mobile phones, multi-camera high-definition photography, 4K / 8K high-definition video playback, multi-communication band compatibility, high-speed communication and computing, and other hardware and functions have put certain pressure on the battery life of mobile phones. Before greater breakthroughs are achieved in battery cell materials, it is usually necessary to reduce the battery packaging space to obtain a larger battery cell size, thereby increasing the battery cell size and battery capacity.

[0003] In the prior art, the battery protection board assembly is composed of a printed circuit board and a flexible circuit board welded together, and the printed circuit board and the flexible circuit board are welded together by adding solder. The welding pads occupy a large area. In order to place a large number of electronic devices, the width of the vertically arranged battery protection board assembly is increased, thereby increasing the battery packaging length and reducing the battery capacity density. How to reduce the width of the protection board assembly and the battery packaging length while ensuring the temperature rise has become an urgent problem to be solved. Utility Model Content

[0004] The purpose of the present application is to provide a protection board assembly and a battery, which can reduce the battery packaging length and improve the battery capacity density while ensuring the temperature rise.

[0005] The present application provides a protection board assembly for connecting to the tab of a battery cell. The protection board assembly includes a flexible circuit board, an electronic device, and a heat sink plate;

[0006] The flexible circuit board includes a first connection portion, and the width direction of the first connection portion is parallel to the length direction of the battery cell;

[0007] The tab and the electronic device are both connected to one side of the first connection portion, and the heat sink plate is connected to the other side of the first connection portion.

[0008] In the above solution, further, the first connection portion is provided with a tab pad and an electronic device pad; the tab can be bent towards the first connection portion and is connected to the first connection portion through the tab pad; the electronic device is connected to the first connection portion through the electronic device pad.

[0009] In the above solution, further, the plate surface of the heat sink plate is attached and connected to one side plate surface of the first connection portion, and the heat sink plate forms a projection area on the other side plate surface of the first connection portion, and both the tab pad and the electronic device pad are located within the projection area.

[0010] In the above solution, further, the heat pipe is connected to the first connecting portion through a heat-conducting adhesive.

[0011] In the above solution, further, the flexible circuit board further includes a second connecting portion; the second connecting portion is connected to the first connecting portion, and a connector pad is provided on the second connecting portion.

[0012] In the above solution, further, the flexible circuit board further includes a third connecting portion;

[0013] The third connecting portion is connected to the end of the first connecting portion, and the third connecting portion is bent in the direction of the heat pipe; there is a gap between the third connecting portion and the first connecting portion to accommodate the heat pipe;

[0014] The second connecting portion is connected to the third connecting portion.

[0015] The present application also provides a battery, including an electric core and the protection board assembly described in the above solution.

[0016] In the above solution, further, a top seal is provided on the end face of the electric core, and the tab extends from the top seal;

[0017] An ear glue is provided at the end of the tab connected to the top seal; in the extending direction of the tab, the size of the ear glue is between 0.2 mm and 2 mm.

[0018] In the above solution, further, an insulation assembly is further included;

[0019] The insulation assembly includes a first insulating adhesive tape, the first insulating adhesive tape is attached to the surface of the top seal, an opening is provided on the first insulating adhesive tape, and the tab penetrates through the opening;

[0020] And / or, the insulation assembly includes a second insulating adhesive tape, and the second insulating adhesive tape is bent to cover the top seal and the protection board assembly.

[0021] In the above solution, further, the end face of the electric core is covered with an isolation pad to isolate the electric core body and the protection board assembly; and the isolation pad is located in the groove formed by the top seal.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] The protection board assembly provided by the present application eliminates the printed circuit board in the prior art. By connecting the tab, electronic device and flexible circuit board, the function of the printed circuit board is replaced by the flexible circuit board, and the pads for connecting the printed circuit board and the flexible circuit board are omitted to release the space for the connecting components of the flexible circuit board. Therefore, on the basis of the same number of components, the width of the flexible circuit board can be reduced, and correspondingly, the battery packaging length can be reduced. And a heat pipe is arranged to be connected with the flexible circuit board to solve the problem of increased temperature rise caused by the reduction of the width of the flexible circuit board, and the heat pipe can also play a role in supporting the flexible circuit board.

[0024] The present application also provides a battery, including the protection board assembly described in the above solution. Based on the above analysis, the battery also has the above beneficial effects and will not be elaborated here. Description of the Drawings

[0025] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic diagram of the first partial structure of the battery provided by the present application;

[0027] Figure 2 It is a schematic diagram of the second partial structure of the battery provided by the present application;

[0028] Figure 3 It is a schematic diagram of the first structure of the protection board assembly provided by the present application;

[0029] Figure 4 It is a schematic diagram of the second structure of the protection board assembly provided by the present application.

[0030] In the figure: 101 - battery cell; 102 - protection board assembly; 103 - flexible circuit board; 104 - electronic device; 105 - heat pipe; 106 - first connection part; 107 - tab; 108 - top seal; 109 - nickel sheet pad; 110 - second connection part; 111 - third connection part; 112 - tab glue; 113 - first insulating tape; 114 - second insulating tape; 115 - isolation pad. Detailed Embodiments

[0031] The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0032] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0034] Embodiment 1

[0035] The protection board assembly 102 provided by the present application is used to connect with the ear 107 of the battery cell 101, so that the protection board assembly 102 can connect the battery cell 101 and the main board of the terminal device. The protection board assembly 102 is equipped with a protection circuit for controlling the charging and discharging of the battery, which can prevent overcharging and overheating of the battery during use, thereby ensuring the working stability and safety of the terminal device. The present application can make the size of the battery package smaller in the length direction, at least reducing the packaging length of the battery head by 0.5 mm. On the basis of keeping the battery length unchanged, the length of the battery cell 101 that can be packaged is increased, and thus the battery capacity density is improved.

[0036] See Figures 1 to 4 As shown, the protection board assembly 102 includes a flexible circuit board 103, electronic devices 104, and a heat pipe 105. The flexible circuit board 103 includes a first connection portion 106, and the width direction of the first connection portion 106 is parallel to the length direction of the battery cell 101; the ear 107 of the battery cell 101 and the electronic devices 104 are both connected to one side of the first connection portion 106, and the heat pipe 105 is connected to the other side of the first connection portion 106.

[0037] Specifically, the protection board assembly 102 of the present application cancels the printed circuit board in the prior art. The flexible circuit board 103 serves as the main structure of the protection board assembly 102, and there is no need to provide pads for soldering with the printed circuit board on the flexible circuit board 103, which can release sufficient space for connecting components. Therefore, on the basis of the same number of components, the size of the flexible circuit board 103 can be reduced. The flexible circuit board 103 shown in the figure is vertically placed on the end face of the lead tab 107 of the battery cell 101. Reducing the width of the flexible circuit board 103 can correspondingly reduce the battery package length.

[0038] As Figure 2 shown, after the lead tab 107 is led out from the battery cell 101, it is directly connected to one side of the flexible circuit board 103, and the electronic device 104 can also be directly arranged on the same side of the flexible circuit board 103, using the flexible circuit board 103 to replace the function of the printed circuit board. Since the width of the flexible circuit board 103 is reduced, the width of the corresponding copper material is reduced, resulting in an increase in internal resistance and an increase in heat generation during the charging and discharging process of the battery. Therefore, a heat sink 105 is provided on the side of the flexible circuit board 103 facing away from the lead tab 107 and the electronic device 104. During the charging and discharging process of the battery, the heat energy generated by the electronic device 104 can be conducted to the heat sink 105. On the heat sink 105, the heat energy can be transferred from the high-temperature area to the low-temperature area to achieve the purpose of temperature balance. In this way, the temperature rise during the charging and discharging of the battery can be reduced, and the service life of the battery can be improved.

[0039] On the other hand, since the flexible circuit board 103 is relatively soft, connecting the heat sink 105 to the flexible circuit board 103 can also play a role in supporting the flexible circuit board 103 and increasing the strength of the flexible circuit board 103, so that the flexible circuit board 103 can be vertically placed on the end face of the lead tab 107.

[0040] In an optional solution of this embodiment, as Figure 1 shown, a top seal 108 is provided on the end face of the battery cell 101, and the lead tab 107 extends from the top seal 108; on the side of the first connecting portion 106 facing the top seal 108, there are a lead tab pad and an electronic device pad; the lead tab 107 is bent towards the first connecting portion 106 and is connected to the first connecting portion 106 through the lead tab pad; the electronic device 104 is connected to the first connecting portion 106 through the electronic device pad.

[0041] In this embodiment, a top seal 108 is provided on the end face of the battery cell 101, and the top seal 108 is close to one end of the battery cell 101 in the thickness direction. Both the positive electrode tab and the negative electrode tab extend from the inner side of the aluminum-plastic film of the top seal 108. The first connecting portion 106 is disposed at the other end of the end face close to the thickness direction of the battery cell 101. Two tab pads are provided on the side of the first connecting portion 106 facing the top seal 108, and the two tab pads correspond to the positions of the positive electrode tab and the negative electrode tab respectively. The positive electrode tab and the negative electrode tab can be welded to the two tab pads nearby, which can reduce the battery packaging length.

[0042] Optionally, the tab pad is specifically Figure 4 the nickel tab pad 109 shown in, and the nickel tab pad 109 and the tab 107 are laser welded.

[0043] In addition, electronic device pads can be arranged as needed at the remaining positions on the side of the first connecting portion 106 facing the top seal 108 to achieve welding with the electronic device 104.

[0044] In an alternative solution of this embodiment, the plate surface of the heat sink 105 is adhesively connected to one side plate surface of the first connecting portion 106, and the heat sink 105 forms a projection area on the other side plate surface of the first connecting portion 106. Both the tab pads and the electronic device pads are located within the projection area.

[0045] In this embodiment, during the charging and discharging process of the battery, the area of the heat conduction area formed by the heat sink 105 covering the first connecting portion 106 is greater than or equal to the area of the heat generation area formed by the tab pads and the electronic device pads covering the first connecting portion 106, so that the heat generated by the heating element can be quickly conducted to the heat sink 105 to achieve the purpose of temperature balance.

[0046] Optionally, the heat sink 105 is preferably made of metal materials with high thermal conductivity such as steel plates, aluminum sheets, copper sheets, etc. or composite materials with equivalent heat conduction functions such as graphite composite materials, boron nitride composite materials, etc. In some application cases with small charging and discharging power and small temperature rise bottlenecks, the heat sink 105 can also be made of materials such as FP4, PC, PI, PET, etc.

[0047] Preferably, the heat sink 105 is connected to the first connecting portion 106 through a thermal conductive adhesive. The thermal conductive adhesive can achieve the installation and fixation of the heat sink 105 and can improve the heat conduction efficiency.

[0048] In an alternative solution of this embodiment, the flexible circuit board 103 further includes a second connecting portion 110; the second connecting portion 110 is connected to the first connecting portion 106, and the second connecting portion 110 is provided with connector pads.

[0049] In this embodiment, the second connecting portion 110 is provided with a connector pad for soldering a BTB connector, i.e., a Back-To-Back connector, a board-to-board connector. The BTB connector is used to electrically connect the battery to the main board of the terminal device, and the battery can supply power to related components of the terminal device through the main board.

[0050] In an alternative solution of this embodiment, the flexible circuit board 103 further includes a third connecting portion 111; the third connecting portion 111 is connected to the end of the first connecting portion 106, and the third connecting portion 111 is bent toward the side where the heat sink plate 105 is located; there is a gap between the third connecting portion 111 and the first connecting portion 106 to accommodate the heat sink plate 105; the second connecting portion 110 is connected to the third connecting portion 111.

[0051] In this embodiment, as Figure 4 shown, the second connecting portion 110 is plate-shaped, and the extending direction of the plate surface of the second connecting portion 110 is the length direction of the battery cell 101. When assembling the second connecting portion 110 with the main board, it is inevitable to stretch the second connecting portion 110. A third connecting portion 111 is also provided between the second connecting portion 110 and the first connecting portion 106. The third connecting portion 111 is located at one end of the first connecting portion 106 in the length direction and is bent toward the side where the heat sink plate 105 is located, so that the third connecting portion 111 will not interfere with the top seal 108. The third connecting portion 111 provides a telescopic margin for the second connecting portion 110, avoiding damage to internal components caused by pulling during assembly.

[0052] Embodiment Two

[0053] Embodiment Two of the present application provides a battery, including a battery cell and the protection board assembly of any of the above embodiments. Therefore, it has all the beneficial technical effects of the protection board assembly of any of the above embodiments, and will not be elaborated here.

[0054] Refer to Figure 2 shown. In an alternative solution of this embodiment, a top seal 108 is provided on the end face of the battery cell 101, and the electrode tab 107 extends from the top seal 108. An electrode tab glue 112 is provided at the end of the electrode tab 107 connected to the top seal 108; in the extending direction of the electrode tab 107, the size of the electrode tab glue 112 is between 0.2 mm and 2 mm.

[0055] In this embodiment, the battery cell 101 includes a positive electrode tab, a negative electrode tab, a separator, a positive electrode ear, a negative electrode ear, an ear glue 112, an aluminum-plastic film, an electrolyte, and other components. Among them, the positive electrode ear and the negative electrode ear extend from the inner side of the aluminum-plastic film at the top seal 108 of the battery cell 101. The ear glue 112 is located at the position where the positive electrode ear and the negative electrode ear extend. Its function is to prevent the positive electrode ear and the negative electrode ear from contacting the aluminum layer in the aluminum-plastic film to form a channel, resulting in an abnormal short circuit of the battery cell 101; or the negative electrode ear contacts the aluminum layer in the aluminum-plastic film to form a lithium-ion channel, resulting in corrosion defects of the battery cell 101.

[0056] Since the ear 107 can be bent only at the position not covered by the ear glue 112, in the prior art, in the lead-out direction of the ear 107, the protruding size of the ear glue 112 is large, the range is wide, and the stability is poor, resulting in an increase in the battery packaging length. In this application, the redundant ear glue 112 can be cut off by laser. Specifically, it can be cut to any value between 0.2 mm and 2.0 mm according to the requirements of the battery packaging length, and the dimensional accuracy is ±0.1 mm, so that the ear glue 112 does not occupy too much space, thereby reducing the battery packaging length.

[0057] In an optional solution of this embodiment, the battery further includes an insulation assembly, and the insulation assembly includes a first insulating tape 113 and / or a second insulating tape 114.

[0058] Among them, the first insulating tape 113 is attached to the surface of the top seal 108. The first insulating tape 113 is provided with an opening, and the ear 107 passes through the opening to connect to the flexible circuit board 103. The first insulating tape 113 can play the role of insulating the top seal 108, preventing the top seal 108 from contacting the whole machine frame to form a lithium-ion channel, resulting in corrosion defects of the battery cell 101, and ensuring the safe use of the battery.

[0059] The second insulating tape 114 is bent to cover the top seal 108 and the protection board assembly 102. Specifically, in actual operation, after the ear 107 is welded to the protection board assembly 102, then the ear 107 is bent. Before bending, the second insulating tape is first wrapped around one side of the top seal 108 and the protection board assembly 102 and wound around the other side of the top seal 108 and the protection board assembly 102, and then the ear 107 is bent so that the final second insulating tape 114 is bent. The second insulating tape 114 can further play the role of insulating the top seal 108 and the protection board assembly 102, preventing the two from contacting the whole machine frame to form a lithium-ion channel, resulting in corrosion defects of the battery cell 101, and ensuring the safe use of the battery.

[0060] In an alternative embodiment of this example, the end face of the battery cell 101 is covered with an isolation pad 115. The isolation pad 115 is located in the groove formed by the top seal 108 and is used to isolate the battery cell 101 body and the protection board assembly 102 to prevent short circuit caused by their contact. The isolation pad 115 is specifically a silicone pad.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application. In addition, those skilled in the art can understand that although some of the embodiments herein include certain features included in other embodiments but not other features, the combination of the features of different embodiments means that it is within the scope of the present application and forms different embodiments.

Claims

1. A protection board assembly for connecting to the tab (107) of the battery cell (101), characterized in that, The protection board assembly (102) includes a flexible circuit board (103), electronic devices (104), and a heat pipe (105); The flexible circuit board (103) includes a first connection portion (106), and the width direction of the first connection portion (106) is parallel to the length direction of the battery cell (101); The tab (107) and the electronic devices (104) are both connected to one side of the first connection portion (106), and the heat pipe (105) is connected to the other side of the first connection portion (106).

2. The protection board assembly according to claim 1, wherein, The first connection portion (106) is provided with a tab pad and an electronic device pad; the tab (107) can be bent towards the first connection portion (106) and is connected to the first connection portion (106) through the tab pad; the electronic devices (104) are connected to the first connection portion (106) through the electronic device pads.

3. The protection board assembly according to claim 2, characterized in that, The plate surface of the heat pipe (105) is attached and connected to one side plate surface of the first connection portion (106), and the heat pipe (105) forms a projection area on the other side plate surface of the first connection portion (106), and both the tab pad and the electronic device pad are located within the projection area.

4. The protection board assembly according to claim 1, wherein The heat pipe (105) is connected to the first connection portion (106) through a thermal conductive adhesive.

5. The protection board assembly according to claim 1, characterized in that, The flexible circuit board (103) further includes a second connection portion (110); the second connection portion (110) is connected to the first connection portion (106), and the second connection portion (110) is provided with a connector pad.

6. The protection board assembly according to claim 5, characterized in that, The flexible circuit board (103) further includes a third connection portion (111); The third connection portion (111) is connected to the end of the first connection portion (106), and the third connection portion (111) is bent towards the side where the heat pipe (105) is located; there is a gap between the third connection portion (111) and the first connection portion (106) to accommodate the heat pipe (105); The second connection portion (110) is connected to the third connection portion (111).

7. A battery, characterized in that, It includes a battery cell (101) and the protection board assembly according to any one of claims 1 to 6.

8. The battery according to claim 7, characterized in that, A top seal (108) is provided on the end face of the battery cell (101), and the tab (107) extends out from the top seal (108); A tab adhesive (112) is provided at the end of the tab (107) connected to the top seal (108); in the lead-out direction of the tab (107), the size of the tab adhesive (112) is between 0.2 mm and 2 mm.

9. The battery according to claim 8, characterized in that, It further includes an insulation assembly; The insulation assembly includes a first insulating tape (113), the first insulating tape (113) is attached to the surface of the top seal (108), the first insulating tape (113) is provided with an opening, and the tab (107) passes through the opening; And / or, the insulation assembly includes a second insulating tape (114), and the second insulating tape (114) is bent to cover the top seal (108) and the protection board assembly (102).

10. The battery according to claim 8, characterized in that, The end face of the battery cell (101) is covered with an isolation pad (115) to isolate the battery cell body from the protection board assembly (102); and the isolation pad (115) is located in the groove formed by surrounding the top seal (108).

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