Battery protection boards, battery components and electronic devices

Abstract

The present application provides a battery protection board, a battery assembly, and an electronic device. A plurality of circuits are arranged on the conductive layer of the battery protection board, and two adjacent circuits are arranged at intervals to form a circuit gap; the battery protection board also includes an insulating extension layer, and when the insulating extension layer is processed, the viscosity of the insulating extension layer is relatively small, so that the circuit gap is easily filled. In addition, the battery protection board may include more than three conductive layers, one of which is provided with a positive electrode circuit, another conductive layer is provided with a negative electrode circuit, and the other one or more conductive layers are provided with a control circuit; the thickness of the conductive layer provided with the control circuit is relatively small, so that the circuit gap is filled. Without substantially affecting the impedance of the battery protection board, the solution provided in the present application is conducive to reducing the consumables required to fill the circuit gap, reducing the thickness of the battery protection board, reducing the space occupied by the battery protection board, and improving the flexibility of the battery protection board.

Description

Technical Field

[0001] The present application relates to the fields of batteries and electronic equipment, and more specifically, to battery protection boards, battery assemblies, and electronic equipment. Background Art

[0002] The battery protection board can protect the charging and discharging of the battery cells. A battery connector can be provided on the battery protection board. The battery connector can be a flexible circuit board to flexibly achieve electrical connection between the battery cells and the devices located around the battery cells. Currently, there is a trend in the market to quickly charge large-capacity battery cells. To achieve fast charging, it is usually necessary to use a relatively large current to charge the battery cells. Increasing the charging current may expose the problem of temperature rise in the battery. To reduce the impedance loss of the battery connector and avoid unnecessary temperature rise, the battery protection board can be provided with a relatively thick circuit. However, this will reduce the bendability of the flexible circuit board, which is not conducive to flexibly achieving electrical connection between the battery cells and the devices located around the battery cells. Summary of the Invention

[0003] The present application provides a battery protection board, a battery assembly and an electronic device, the purpose of which is to reduce the thickness of the battery protection board without substantially affecting the impedance of the battery protection board, so as to reduce the space occupied by the battery protection board and improve the flexibility of the battery protection board.

[0004] In a first aspect, a battery protection plate is provided. The battery protection plate can be divided into a hard protection plate and a flexible extension plate. The battery protection plate includes a first conductive layer, the first conductive layer is distributed on the hard protection plate and the flexible extension plate, and a plurality of circuits are provided on the first conductive layer, with adjacent circuits spaced apart to form a circuit gap. The battery protection plate further includes:

[0005] a first insulating extension layer, the first insulating extension layer covering one side of the first conductive layer and filling in line gaps of the first conductive layer, the first insulating extension layer being made of a first material;

[0006] a first flexible covering layer, the first flexible covering layer being located on a surface of the flexible extension plate;

[0007] A first adhesive layer is adhered between the first flexible cover layer and the first insulating extension layer, and the material of the first adhesive layer is the second material, wherein:

[0008] When the first material and the second material are heated, the viscosity of the first material is lower than the viscosity of the second material.

[0009] During the processing, the viscosity of the adhesive layer can be greater than the viscosity of the insulating extension layer. Using the adhesive layer to fill the gaps in the circuits is relatively more difficult. To ensure that the adhesive layer can fill the gaps in the circuits, a relatively thick adhesive layer needs to be used. This makes the total thickness of the flexible extension board relatively large. Using the insulating extension layer to fill the gaps in the circuits is relatively easy. The total amount of insulating extension layer required to fill the gaps in the circuits is relatively small. The thickness of the insulating extension layer can be relatively small, which in turn can make the total thickness of the flexible extension board relatively small. This helps reduce the space occupied by the battery protection board in the electronic device, thereby providing space for other devices, such as batteries. Increasing the space occupied by the battery can help increase the battery capacity. In addition, reducing the thickness of the battery protection board helps improve the flexibility of the battery protection board, which in turn helps improve the bendability, bending fatigue life, and assembly flexibility of the flexible extension board.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the first material includes one or more of the following: polyimide PI, ink.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the second material includes one or more of the following: thermosetting adhesive, photosensitive adhesive, and epoxy resin.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the first conductive layer includes a first positive electrode circuit and a first negative electrode circuit, and the battery protection board further includes:

[0013] a second conductive layer, the second conductive layer comprising a second positive electrode circuit and a second negative electrode circuit;

[0014] a first flexible insulating layer, the first flexible insulating layer being located between the first conductive layer and the second conductive layer;

[0015] a first electrical connection path, the first electrical connection path passing through the first flexible insulating layer and used to electrically connect the first positive electrode circuit with the second positive electrode circuit;

[0016] A second electrical connection path passes through the first flexible insulating layer and is used to electrically connect the first negative electrode circuit and the second negative electrode circuit.

[0017] The first and second conductive layers can be electrically connected to the positive and negative electrodes of the battery, respectively. The second conductive layer also uses insulating ductile material to fill the gaps, which helps further reduce the thickness of the insulating ductile layer and improve the flexibility of the battery protection board.

[0018] In combination with the first aspect, in certain implementations of the first aspect, a control pin is provided on the first conductive layer, the second conductive layer further includes a control circuit, and the battery protection board further includes:

[0019] A third electrical connection path passes through the first flexible insulating layer and is used to electrically connect the control circuit and the control pin.

[0020] The first conductive layer and the second conductive layer can be connected to each other through vias or the like.

[0021] In a second aspect, a battery protection plate is provided. The battery protection plate can be divided into a hard protection plate and a flexible extension plate. The battery protection plate includes:

[0022] The first conductive layer, the second conductive layer, the third conductive layer, the first flexible insulating layer, and the second flexible insulating layer are stacked, and the first conductive layer, the second conductive layer, the third conductive layer, the first flexible insulating layer, and the second flexible insulating layer are all distributed on the hard protective plate and the flexible extension plate. The second conductive layer is located between the first conductive layer and the third conductive layer, the first flexible insulating layer is located between the first conductive layer and the second conductive layer, and the second flexible insulating layer is located between the second conductive layer and the third conductive layer. A first circuit is provided on the first conductive layer, a plurality of control circuits are provided on the second conductive layer, and a second circuit is provided on the third conductive layer. One of the first circuit and the second circuit is a positive circuit, and the other is a negative circuit.

[0023] The first and third conductive layers are used to provide positive and negative wiring, respectively, to connect to the battery's positive and negative electrodes. The control circuitry can be primarily provided on the second conductive layer. Therefore, the current that can flow through the first and third conductive layers can be relatively large, which helps improve the battery's charging performance. Furthermore, since the number of circuit gaps on the first and third conductive layers is relatively small, the total amount of insulating material required for the first and third conductive layers is relatively small, thus helping to reduce the overall thickness of the battery.

[0024] Disposing the second conductive layer between the first conductive layer and the third conductive layer is beneficial to reducing the gap that causes a short circuit between the first conductive layer and the third conductive layer.

[0025] In combination with the second aspect, in certain implementations of the second aspect, the thickness of the first conductive layer is greater than the thickness of the second conductive layer, and the thickness of the third conductive layer is greater than the thickness of the second conductive layer.

[0026] The current value of the second conductive layer can be relatively small, so the thickness of the second conductive layer itself can be reduced. Reducing the overall thickness of the battery is conducive to reducing the space occupied by the battery protection board in the electronic device, thereby providing space for other devices, such as batteries. Increasing the space occupied by the battery can help increase the battery capacity. In addition, reducing the thickness of the battery protection board is conducive to improving the flexibility of the battery protection board, which in turn is conducive to improving the bendability, bending fatigue life and assembly flexibility of the flexible extension board.

[0027] In combination with the second aspect, in certain implementations of the second aspect, no positive electrode circuit and no negative electrode circuit are provided on the second conductive layer.

[0028] The second conductive layer rarely flows a large current, and the thickness of the second conductive layer can be further reduced, which is beneficial to reducing the overall thickness of the battery.

[0029] In combination with the second aspect, in some implementations of the second aspect, no control circuit is provided on the first conductive layer and the third conductive layer.

[0030] The number of circuit gaps on the first conductive layer and the third conductive layer can be minimized, which is beneficial for further reducing the total amount of insulating material used to fill the gaps, thereby reducing the overall thickness of the battery.

[0031] In conjunction with the second aspect, in certain implementations of the second aspect, two adjacent control circuits of the second conductive layer are spaced apart to form a circuit gap, and the battery protection board further includes:

[0032] A third flexible insulating layer is filled in the circuit gap and adhered between the second conductive layer and the first flexible insulating layer.

[0033] In addition to disconnecting adjacent circuits on the second conductive layer, the third flexible insulating layer can also allow the second conductive layer to adhere to the first flexible insulating layer, thereby improving the mechanical stability of the battery protection board, especially the flexible extension board.

[0034] In conjunction with the second aspect, in some implementations of the second aspect, the third flexible insulating layer includes:

[0035] a first part, the first part being filled in the circuit gap, and the material of the first part being a first material;

[0036] The second part is pasted between the first part and the first flexible insulating layer, and the material of the second part is a second material, wherein:

[0037] When the first material and the second material are heated, the viscosity of the first material is lower than the viscosity of the second material.

[0038] The third flexible insulating layer is divided into two parts, each of which can serve different functions. The first part can be primarily used for insulation, while the second part can be primarily used for adhesive bonding. During processing, the viscosity of the adhesive material can be greater than that of the insulating extension material. Using insulating extension material in part of the third flexible insulating layer helps reduce the thickness of the third flexible insulating layer, thereby reducing the overall thickness of the flexible extension plate.

[0039] In combination with the second aspect, in certain implementations of the second aspect, the first material includes one or more of the following: polyimide PI, ink.

[0040] In combination with the second aspect, in certain implementations of the second aspect, the second material includes one or more of the following: thermosetting adhesive, photosensitive adhesive, and epoxy resin.

[0041] In conjunction with the second aspect, in certain implementations of the second aspect, a pin is provided on the first conductive layer, and the battery protection board further includes:

[0042] a fourth electrical connection path, passing through the first flexible insulating layer and the second flexible insulating layer, and configured to electrically connect the pin to the second circuit;

[0043] A first insulating component is provided in the first conductive layer and is located between the fourth electrical connection path and the first circuit, and is used to separate the fourth electrical connection path from the first circuit.

[0044] The battery protection board can be electrically connected to other components via the positive and negative pins on the first conductive layer. A direct short circuit between the positive and negative pins is not permitted. Providing insulating components around the pins can help prevent short circuits between the first and second circuits.

[0045] In a third aspect, a battery protection plate is provided. The battery protection plate can be divided into a hard protection plate and a flexible extension plate. The battery protection plate includes:

[0046] The first conductive layer, the second conductive layer, the third conductive layer, the first flexible insulating layer, and the second flexible insulating layer are stacked. The first conductive layer, the second conductive layer, the third conductive layer, the first flexible insulating layer, and the second flexible insulating layer are all distributed on the hard protective plate and the flexible extension plate. The first conductive layer is located between the second conductive layer and the third conductive layer, the first flexible insulating layer is located between the first conductive layer and the second conductive layer, and the second flexible insulating layer is located between the first conductive layer and the third conductive layer. A first circuit is provided on the first conductive layer, a plurality of control circuits are provided on the second conductive layer, and a second circuit is provided on the third conductive layer. One of the first circuit and the second circuit is a positive circuit, and the other is a negative circuit.

[0047] The first and third conductive layers are used to provide positive and negative wiring, respectively, to connect to the battery's positive and negative electrodes. The control circuitry can be primarily provided on the second conductive layer. Therefore, the current that can flow through the first and third conductive layers can be relatively large, which helps improve the battery's charging performance. Furthermore, since the number of circuit gaps on the first and third conductive layers is relatively small, the total amount of insulating material required for the first and third conductive layers is relatively small, thus helping to reduce the overall thickness of the battery.

[0048] Placing the first conductive layer within the second and third conductive layers helps keep the control circuitry relatively close to the outside, exposing the control pins of the battery protection board and facilitating wiring. It also helps keep the resistance of the positive and negative circuits similar.

[0049] In combination with the third aspect, in certain implementations of the third aspect, the thickness of the first conductive layer is greater than the thickness of the second conductive layer, and the thickness of the third conductive layer is greater than the thickness of the second conductive layer.

[0050] The current value of the second conductive layer can be relatively small, so the thickness of the second conductive layer itself can be reduced. Reducing the overall thickness of the battery is conducive to reducing the space occupied by the battery protection board in the electronic device, thereby providing space for other devices, such as batteries. Increasing the space occupied by the battery can help increase the battery capacity. In addition, reducing the thickness of the battery protection board is conducive to improving the flexibility of the battery protection board, which in turn is conducive to improving the bendability, bending fatigue life and assembly flexibility of the flexible extension board.

[0051] In combination with the third aspect, in certain implementations of the third aspect, no positive electrode circuit and no negative electrode circuit are provided on the second conductive layer.

[0052] The second conductive layer rarely flows a large current, and the thickness of the second conductive layer can be further reduced, which is beneficial to reducing the overall thickness of the battery.

[0053] In combination with the third aspect, in certain implementations of the third aspect, no control circuit is provided on the first conductive layer and the third conductive layer.

[0054] The number of circuit gaps on the first conductive layer and the third conductive layer can be minimized, which is beneficial for further reducing the total amount of insulating material used to fill the gaps, thereby reducing the overall thickness of the battery.

[0055] In conjunction with the third aspect, in certain implementations of the third aspect, two adjacent control circuits of the second conductive layer are spaced apart to form a circuit gap, and the battery protection board further includes:

[0056] a first insulating extension layer, wherein the first insulating extension layer is filled in the circuit gap and the material of the first insulating extension layer is a first material;

[0057] a first flexible covering layer, the first flexible covering layer being located on a surface of the flexible extension plate;

[0058] A first adhesive layer is adhered between the first flexible cover layer and the first insulating extension layer, and the material of the first adhesive layer is the second material, wherein:

[0059] When the first material and the second material are heated, the viscosity of the first material is lower than the viscosity of the second material.

[0060] During processing, the viscosity of the adhesive layer can be greater than that of the insulating extension layer. This makes it more difficult to fill circuit gaps with the adhesive layer. To ensure that the adhesive layer can fill the circuit gaps, a relatively thick adhesive layer is required. This results in a relatively large overall thickness of the flexible extension board. Filling circuit gaps with the insulating extension layer is relatively easy. The total amount of insulating extension layer required to fill the gaps is relatively small. The thickness of the insulating extension layer can be relatively small, which in turn reduces the overall thickness of the flexible extension board.

[0061] In combination with the third aspect, in certain implementations of the third aspect, the first material includes one or more of the following: polyimide PI, ink.

[0062] In combination with the third aspect, in certain implementations of the third aspect, the second material includes one or more of the following: thermosetting adhesive, photosensitive adhesive, and epoxy resin.

[0063] In conjunction with the third aspect, in certain implementations of the third aspect, a pin is provided on the first conductive layer, and the battery protection board further includes:

[0064] a fifth electrical connection path, passing through the first flexible insulating layer and the second flexible insulating layer, and configured to electrically connect the pin to the second circuit;

[0065] A second insulating component is provided in the first conductive layer and located between the fifth electrical connection path and the first circuit, and is used to separate the fourth electrical connection path from the first circuit.

[0066] The battery protection board can be electrically connected to other components via the positive and negative pins on the second conductive layer. A direct short circuit between the positive and negative pins is not permitted. Providing insulating components in the areas of the first conductive layer corresponding to the pins can help prevent short circuits between the first and second circuits.

[0067] In conjunction with the third aspect, in certain implementations of the third aspect, the fifth electrical connection path includes:

[0068] an electrical connection region, the electrical connection region being disposed on the first conductive layer and spaced apart from the first circuit, the second insulating component being located between the first circuit and the electrical connection region;

[0069] a first electrical connector, passing through the first flexible insulating layer and electrically connected between the pin and the electrical connection area;

[0070] The second electrical connector passes through the second flexible insulating layer and is electrically connected between the electrical connection area and the second circuit.

[0071] Electrical connectors are respectively provided on the first flexible insulating layer and the second flexible insulating layer to connect a fifth electrical connection path.

[0072] In conjunction with the third aspect, in certain implementations of the third aspect, the fifth electrical connection path includes:

[0073] a third electrical connector, the third electrical connector passing through the first flexible insulating layer and the second flexible insulating layer and electrically connected between the pin and the second circuit, wherein:

[0074] The second insulating component is located between the first flexible insulating layer and the second flexible insulating layer, and between the first circuit and the third electrical connector, and is used to separate the third electrical connector from the first circuit.

[0075] The fifth electrical connection path may include, for example, a columnar conductive member, and the columnar conductive member may directly pass through the first flexible insulating layer and the second flexible insulating layer.

[0076] In conjunction with the third aspect, in certain implementations of the third aspect, a pin is provided on the first conductive layer, and the battery protection board further includes:

[0077] a fifth electrical connection path, passing through the first flexible insulating layer and the second flexible insulating layer, and configured to electrically connect the pin to the second circuit;

[0078] The first flexible insulating layer or the second flexible insulating layer is filled between the fifth electrical connection path and the first circuit, so as to separate the fifth electrical connection path from the first circuit.

[0079] Directly using a flexible insulating layer to avoid a short circuit between the positive pin and the negative pin can help simplify the processing technology of the battery protection board.

[0080] In a fourth aspect, a battery assembly is provided, comprising a battery and a battery protection plate as described in any one of the implementations of the first to third aspects above, wherein the battery protection plate is electrically connected to the positive and negative electrodes of the battery.

[0081] In a fifth aspect, an electronic device is provided, comprising a battery and a battery protection board as described in any one of the implementations of the first to third aspects above, wherein the battery protection board is electrically connected to the positive and negative electrodes of the battery.

[0082] In a sixth aspect, an electronic device is provided, comprising a battery assembly as described in any one of the implementations of the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 It is a schematic structural diagram of an electronic device.

[0084] Figure 2 It is a schematic structural diagram of a battery assembly.

[0085] Figure 3 It is a schematic structural diagram of another battery component.

[0086] Figure 4 It is a schematic structural diagram of another battery assembly.

[0087] Figure 5 This is a schematic structural diagram of a battery protection board provided in an embodiment of the present application.

[0088] Figure 6 This is a schematic structural diagram of the circuit of a battery protection board provided in an embodiment of the present application.

[0089] Figure 7 This is a schematic structural diagram of a flexible extension plate provided in an embodiment of the present application.

[0090] Figure 8 This is a schematic structural diagram of another battery protection board provided in an embodiment of the present application.

[0091] Figure 9 This is a schematic structural diagram of the circuit of another battery protection board provided in an embodiment of the present application.

[0092] Figure 10 This is a schematic structural diagram of another flexible extension plate provided in an embodiment of the present application.

[0093] Figure 11 This is a schematic structural diagram of another flexible extension plate provided in an embodiment of the present application.

[0094] Figure 12 This is a schematic structural diagram of another battery protection board provided in an embodiment of the present application.

[0095] Figure 13 This is a schematic structural diagram of the circuit of another battery protection board provided in an embodiment of the present application.

[0096] Figure 14 This is a schematic structural diagram of another flexible extension plate provided in an embodiment of the present application.

[0097] Figure 15 This is a schematic structural diagram of another flexible extension plate provided in an embodiment of the present application.

[0098] Figure 16 This is a schematic structural diagram of another flexible extension plate provided in an embodiment of the present application.

[0099] Figure 17 This is a schematic structural diagram of another flexible extension plate provided in an embodiment of the present application. DETAILED DESCRIPTION

[0100] The technical solution in this application will be described below with reference to the accompanying drawings.

[0101] Figure 1 1 is a schematic structural diagram of an electronic device 100 provided in an embodiment of the present application. The electronic device 100 may be, for example, a terminal consumer product or a 3C electronic product (computer, communication, or consumer electronics), such as a mobile phone, a power bank, a portable device, a tablet computer, an e-reader, a notebook computer, a digital camera, a wearable device, an in-vehicle terminal, or headphones. The electronic device 100 may also be a mobile device. Examples of the mobile device include a vehicle, an electric skateboard, and an electric bicycle. Figure 1 The illustrated embodiment is described by taking the electronic device 100 as a mobile phone as an example.

[0102] The electronic device 100 may include a housing 10, a display screen 20, and a battery assembly 30. Specifically, the housing 10 may include a frame 12 and a back cover 11. The frame 12 may be located between the display screen 20 and the back cover 11. The frame 12 may surround the periphery of the display screen 20 and the periphery of the back cover 11. The cavity formed between the display screen 20, the frame 12, and the back cover 11 may be used to accommodate the battery assembly 30. The cavity of the electronic device 100 for accommodating the battery assembly 30 may be referred to as a battery compartment. The battery assembly 30 may be used to power the electronic devices within the electronic device 100.

[0103] Figures 2 to 4 is a schematic structural diagram of various battery assemblies 30. These battery assemblies 30 may correspond to Figure 1 The battery assembly 30 is shown.

[0104] The battery assembly 30 may include a battery 310 and a battery protection board 320. The battery 310 may be electrically connected to the battery protection board 320.

[0105] The battery 310 can be a lithium electron secondary battery, a sodium ion secondary battery, a potassium ion secondary battery, a magnesium ion secondary battery, a zinc ion secondary battery, an aluminum ion secondary battery, etc. The battery 310 can include a positive electrode material, a negative electrode material, an electrolyte, and a diaphragm. The positive electrode material and the negative electrode material can deintercalate metal ions (such as lithium ions) to achieve energy storage and release. The positive electrode material and the negative electrode material are the main energy storage parts of the battery 310, which can reflect the energy density, cycle performance and safety performance of the battery 310. The electrolyte can be a transmission carrier for metal ions between the positive electrode material and the negative electrode material. The diaphragm can pass through metal ions, but the diaphragm itself is not conductive, so that the diaphragm can separate the positive electrode material and the negative electrode material to prevent a short circuit between the positive electrode material and the negative electrode material.

[0106] The battery protection board 320 can be used to protect the battery 310 so that the charging or discharging state of the battery 310 can be relatively normal. For example, the battery protection board 320 can provide overcharge protection, over-discharge protection, overcurrent protection, and over-temperature protection for the battery 310.

[0107] In one example, the charging state of battery 310 can vary during different charging stages. When the charge level of battery 310 is relatively low, the charging state of battery 310 can be approximately constant current charging. As the charge level of battery 310 gradually increases, the voltage of battery 310 can gradually increase, and the current of battery 310 can gradually decrease. When the charge level of battery 310 is nearly full, the charging state of battery 310 can be switched to approximately constant voltage charging. If, during the charging process of battery 310, battery 310 is in constant current charging mode and the voltage of battery 310 is too high, or if battery 310 is in constant voltage charging mode and the charging current of battery 310 is too high, the charging load on battery 310 is large, which can easily cause safety issues such as damage to battery 310. If the charging current of battery 310 is too high or the charging voltage of battery 310 is too high, the protection switch on the battery protection board 320 can be disconnected to activate the overcharge protection function of the battery protection board 320, thereby ensuring the charging safety of battery 310.

[0108] In another example, when the electronic device is running a high-power consumption process, the discharge current of the battery 310 may be relatively high, which may easily cause the battery 310 to overheat during discharge. When the discharge current of the battery 310 is too large or the battery 310 is severely heated, the protection switch on the battery protection board 320 may be disconnected to activate the over-discharge protection function of the battery protection board 320, thereby protecting the discharge safety of the battery 310.

[0109] The battery protection plate 320 may include a hard protection plate 321 and a flexible extension plate.

[0110] The hard protective plate 321 can be electrically connected to the positive electrode material and the negative electrode material of the battery 310. For example, the hard protective plate 321 can be electrically connected to the positive electrode tab and the negative electrode tab of the battery 310.

[0111] The hard protective plate 321 can be used to carry electronic devices, which can be used to implement charge and discharge protection for the battery 310, for example. The electronic devices carried on the hard protective plate 321 can include, for example, metal oxide semiconductor field effect transistors (the full name can be MOSFET (metal oxide semiconductor field effect transistor) tube, which can be abbreviated as MOS (metal-oxide-semiconductor, MOS) tube), charge and discharge protection integrated circuits (integrated circuit, IC), etc. The MOS tube can be the protection switch mentioned above. The MOS tube can be connected in series in the charging circuit or the discharging circuit. The charge and discharge protection integrated circuit may include a comparator. The comparator can be used to monitor the voltage difference between the two ends of the battery 310, for example. When the comparator detects an abnormal situation (for example, the voltage difference between the two ends of the battery 310 is too high), the charge and discharge protection integrated circuit can cut off the MOS tube to cut off the charging circuit or the discharging circuit, thereby performing charge protection or discharge protection on the battery 310.

[0112] Optionally, the electronic devices carried on the hard protection plate 321 may also include, for example, resistors, capacitors, auxiliary current fuses, positive temperature coefficient (PTC) components (which can provide over-temperature protection or over-current protection), storage devices, etc.

[0113] The first end of the flexible extension board can be connected to the hard protective board 321 and electrically connected to the hard protective board 321. The second end of the flexible extension board can be provided with a connector (such as a board-to-board (BTB) connector). The flexible extension board can be electrically connected to other components within the electronic device through this connector, such as the mainboard of the electronic device, so that the battery 310 can power the other circuit board components.

[0114] exist Figure 2 In the example shown, the battery protection board 320 may include a hard protective board 321 and a first flexible extension board 322. The hard protective board 321 is located on a first side of the battery 310. The first end of the first flexible extension board 322 may be connected to the first end of the hard protective board 321, flipped over the hard protective board 321, and extended toward the first side of the battery 310. A first connector 331 may be provided on the second end of the first flexible extension board 322. The battery protection board 320 can be electrically connected to other components within the electronic device via the first connector 331.

[0115] and Figure 2 Similar to the example shown, in Figure 3In the example shown, the battery protection plate 320 may include a hard protection plate 321 and a first flexible extension plate 322. Figure 3 In the example shown, the battery protection board 320 may further include a second flexible circuit board. The first end of the second flexible extension board 323 may be connected to the second end of the hard protection board 321, flipped over and set on the hard protection board 321, and extending toward the first side of the battery 310. A second connector 332 may be provided on the second end of the first flexible extension board 322. The battery protection board 320 can be electrically connected to other devices in the electronic device through the first connector 331 and the second connector 332. The device located at the first end of the hard protection board 321 can be electrically connected to the battery protection board 320 through the first connector 331. The device located at the second end of the hard protection board 321 can be electrically connected to the battery protection board 320 through the second connector 332.

[0116] and Figure 2 Similar to the example shown, in Figure 4 In the example shown, the battery protection plate 320 may include a hard protection plate 321 and a first flexible extension plate 322. Figure 4 In the example shown, the battery protection board 320 may also include a second flexible circuit board. The first end of the second flexible extension board 323 may be connected to the second end of the hard protection board 321, flipped over the hard protection board 321, and extended toward the second side of the battery 310. A second connector 332 may be provided on the second end of the first flexible extension board 322. Devices located on the first side of the battery 310 may be electrically connected to the battery protection board 320 via the first connector 331. Devices located on the second side of the battery 310 may be electrically connected to the battery protection board 320 via the second connector 332.

[0117] Large-capacity batteries and fast charging are gradually becoming the development trend of batteries.

[0118] To increase battery capacity within a limited space, one approach is to reduce the size of the conductive material in the battery protection board to reduce the overall board footprint. However, this can increase the impedance of the battery protection board. When charging or discharging currents are relatively high, the battery protection board may overheat, potentially limiting the battery charging speed.

[0119] To increase the battery charging speed within a limited space, one approach is to increase the size of the conductive material in the battery protection board to reduce the impedance of the battery protection board. However, this may increase the overall space occupied by the battery protection board, which may in turn reduce the battery capacity.

[0120] Figures 5 to 7 The battery protection board 320 provided in the embodiment of the present application is shown. The battery protection board 320 can be applied to Figures 2 to 4 In any battery assembly 30. The battery protection plate 320 can be divided into a hard protection plate 321 and a flexible extension plate 322.

[0121] The battery protection board 320 may include a first conductive layer 410, a second conductive layer 420, and a first flexible insulating layer 430 that are stacked. The first flexible insulating layer 430 may be located between the first conductive layer 410 and the second conductive layer 420 to insulate the first conductive layer 410 from the second conductive layer 420. The conductive layer may be made of a conductive material such as copper. The flexible insulating layer may be bendable. The flexible insulating layer may also be referred to as a flexible insulating material. The flexible insulating layer may be made of materials such as polyimide (PI) and polyethylene glycol terephthalate (PET).

[0122] The first conductive layer 410, the second conductive layer 420, and the first flexible insulating layer 430 may be distributed on the hard protective plate 321 and the flexible extension plate 322. The conductive layer of the flexible extension plate 322 may be connected to the corresponding conductive layer of the hard protective plate 321. The conductive layer of the flexible extension plate 322 may be integrally formed with the corresponding conductive layer of the hard protective plate 321. The insulating layer of the flexible extension plate 322 may be connected to the corresponding insulating layer of the hard protective plate 321. The insulating layer of the flexible extension plate 322 may be integrally formed with the corresponding insulating layer of the hard protective plate 321.

[0123] like Figure 6 As shown, circuits may be arranged on the first conductive layer 410 and the second conductive layer 420 .

[0124] The first conductive layer 410 may include a first positive line 411 , a first negative line 412 , and at least one first control line 413 ; the second conductive layer 420 may include a second positive line 421 , a second negative line 422 , and at least one second control line 423 .

[0125] The positive circuit can be used to output electrical signals from the positive electrode of the battery, or to input electrical signals to the positive electrode of the battery. The negative circuit can be used to output electrical signals from the negative electrode of the battery, or to input electrical signals to the negative electrode of the battery. The control circuit can be used to transmit control signals. Control signals may include, for example, signals for adjusting the battery's charge and discharge modes. To reduce the impedance of the battery assembly, the thickness and lateral dimensions of the positive and negative circuits can be relatively large. In other words, the positive and negative circuits can be relatively thick and relatively wide.

[0126] The first positive line 411 and the second positive line 421 may be located on a first side of the battery protection board 320 . The first positive line 411 and the second positive line 421 may be electrically connected via a first electrical connection path 431 passing through the first flexible insulating layer 430 .

[0127] The first negative electrode line 412 and the second negative electrode line 422 may be located on the second side of the battery protection board 320 . The first negative electrode line 412 and the second negative electrode line 422 may be electrically connected via a second electrical connection path 432 passing through the first flexible insulating layer 430 .

[0128] The first control circuit 413 may be located between the first positive circuit 411 and the first negative circuit 412 . The second control circuit 423 may be located between the second positive circuit 421 and the second negative circuit 422 .

[0129] The battery protection board 320 may also include multiple pins. These pins may, for example, be conductive components such as solder pads. These pins may, for example, be disposed on the first conductive layer 410. These pins may include, for example, a positive pin 441, a negative pin 442, and multiple control pins. Positive pin 441 may be electrically connected to a positive circuit. Negative pin 442 may be electrically connected to a negative circuit. The control pins may be electrically connected to a control circuit.

[0130] For example, a positive pin 441 may be provided on the first positive line 411. Positive pin 441 may be electrically connected to the first positive line 411 and, via a first electrical connection path 431, may be electrically connected to the second positive line 421. A negative pin 442 may be provided on the first negative line 412. Negative pin 442 may be electrically connected to the first negative line 412 and, via a second electrical connection path 432, may be electrically connected to the second negative line 422. The plurality of control pins may include a first control pin 443. The first control pin 443 may be electrically connected to the first control line 413 of the first conductive layer 410. The plurality of control pins may further include a second control pin 444. The second control pin 444 may be electrically connected to the second control line 423 via a third electrical connection path 433 passing through the first flexible insulating layer 430.

[0131] The battery protection plate 320 may further include a first insulating extension layer 611 and a second insulating extension layer 612. The first insulating extension layer 611 may be located on the side of the first flexible insulating layer 430 away from the second conductive layer 420. The second insulating extension layer 612 may be located on the side of the first flexible insulating layer 430 away from the first conductive layer 410. The material of the insulating extension layer may be an insulating material having high ductility at high temperatures, such as ink or liquid PI having high ductility at high temperatures. The insulating extension layer may be applied to the conductive layer, for example, by screen printing, dispensing, spraying, or the like. The material of the insulating extension layer may be a first material, and the viscosity of the first material may be relatively small when the first material is heated (or processed).

[0132] Figure 7 yes Figure 5 AA cross-section shown.

[0133] Because multiple circuits (such as the aforementioned first positive circuit 411, first negative circuit 412, and first control circuit 413) may be arranged on the first conductive layer 410, gaps may exist between adjacent circuits. Therefore, the first conductive layer 410 may form multiple first circuit gaps 414. The first insulating extension layer 611 may cover a side of the first conductive layer 410 away from the first flexible insulating layer 430 and may fill the first circuit gaps 414 of the first conductive layer 410. The first insulating extension layer 611 may contact the first flexible insulating layer 430.

[0134] Because multiple circuits (such as the second positive circuit 421, the second negative circuit 422, and the second control circuit 423) can be arranged on the second conductive layer 420, gaps can exist between adjacent circuits. Therefore, the second conductive layer 420 can form multiple second circuit gaps 424. The second insulating extension layer 612 can cover the side of the second conductive layer 420 away from the first flexible insulating layer 430 and can fill the second circuit gaps 424 of the second conductive layer 420. The second insulating extension layer 612 can contact the first flexible insulating layer 430.

[0135] The flexible extension plate 322 may also be provided with a first flexible covering layer 631, a second flexible covering layer 632, a first adhesive layer 621, and a second adhesive layer 622. The first flexible covering layer 631 may be adhered to the first insulating extension layer 611 via the first adhesive layer 621. The second flexible covering layer 632 may be adhered to the second insulating extension layer 612 via the second adhesive layer 622. The flexible covering layer may be made of a flexible material, such as PI. The material of the flexible covering layer may enhance the flexibility of the flexible extension plate 322. The flexible covering layer may be used to cover the outermost conductive layer. The flexible covering layer may help prevent the outermost conductive layer from being exposed, thereby reducing the possibility of contamination of the conductive layer. The flexible covering layer may also help prevent scratches on the surface of the flexible extension plate 322.

[0136] The adhesive layer may be viscous. The adhesive layer may be made of the second material. When the second material is heated (or processed), the viscosity of the second material may be relatively high. For example, when the first material (i.e., the insulating extension layer) and the second material (i.e., the adhesive layer) are heated (or processed), the viscosity of the first material is lower than the viscosity of the second material.

[0137] A first rigid insulating layer 531 and a second rigid insulating layer 532 may be provided on the rigid protective plate 321. The first rigid insulating layer 531 may be provided on a side of the first conductive layer 410 away from the first flexible insulating layer 430. The second rigid insulating layer 532 may be provided on a side of the second conductive layer 420 away from the first flexible insulating layer 430. The rigid insulating layers may be, for example, prepregs. The rigid insulating layers provide the rigid circuit board with relatively high rigidity, thereby preventing the rigid protective plate 321 from bending or deformation.

[0138] In addition to the first conductive layer 410, the second conductive layer 420, and the first flexible insulating layer 430, multiple other conductive layers and multiple insulating layers may also be provided on the hard protective plate 321. Figure 5 In the illustrated example, the hard protective plate 321 may further include a conductive layer 5101, an insulating layer 5201, and a conductive layer 5102 stacked in sequence, as well as a conductive layer 5103, an insulating layer 5202, and a conductive layer 5104 stacked in sequence. In addition to the first conductive layer 410 and the second conductive layer 420, the circuits on the multiple conductive layers 510 of the hard protective plate 321 can be used to electrically connect to the devices carried by the hard protective plate 321.

[0139] A first hard coating layer 541 and a second hard coating layer 542 may also be provided on the hard protective plate 321. The hard coating layer may be, for example, a hard ink. The hard coating layer may be used to cover the surface conductive layer to prevent the surface conductive layer from being exposed, thereby reducing the possibility of contamination of the conductive layer.

[0140] In one example, the thickness of the first flexible cover layer 631 can be approximately 12.5 μm. The thickness of the second flexible cover layer 632 can be approximately 12.5 μm. The thickness of the first adhesive layer 621 can be approximately 12.5 μm. The thickness of the second adhesive layer 622 can be approximately 12.5 μm. The thickness of the first insulating extension layer 611 can be approximately 30 μm. The thickness of the second insulating extension layer 612 can be approximately 30 μm. The thickness of the second adhesive layer 622 can be approximately 12.5 μm. The thickness of the first conductive layer 410 can be approximately 90 μm. The thickness of the second conductive layer 420 can be approximately 90 μm. The thickness of the first flexible insulating layer 430 can be approximately 25 μm. The thickness of the flexible extension plate 322 of the battery protection plate 320 can be approximately 315 μm.

[0141] In some scenarios, the insulating extension layer can be replaced by an adhesive layer. The adhesive layer can be filled into the circuit gap by heating and pressurizing. In order to reduce the impedance of the battery assembly, the thickness of the conductive layer can be relatively thick, so the depth of the circuit gap formed by the conductive layer is relatively deep. However, the ductility of the adhesive layer is relatively poor. It is relatively difficult to use the adhesive layer to fill the circuit gap. To ensure that the adhesive layer can fill the circuit gap, a relatively thick adhesive layer is required (for example, the thickness of the adhesive layer can be about 70μm). This makes the total thickness of the flexible extension plate 322 relatively large (for example, the total thickness can reach 370μm).

[0142] If an insulating extension layer is used to fill the circuit gaps, the insulating extension layer can have high ductility during the filling process, so the insulating extension layer can fill the circuit gaps relatively easily, and the thickness of the insulating extension layer can be relatively small, thereby making the total thickness of the flexible extension plate 322 relatively small.

[0143] Since the thickness of the flexible extension plate 322 can be relatively small, it is beneficial to improve the bendability, bending fatigue life, and assembly flexibility of the flexible extension plate 322 .

[0144] Figures 8 to 11 Another battery protection board 1320 provided in an embodiment of the present application is shown. The battery protection board 1320 can be applied to Figures 2 to 4 In any battery assembly 30. Figures 5 to 7 The battery protection board 320 shown is similar, Figures 8 to 11 The battery protection plate 1320 shown can be divided into a hard protection plate 1321 and a flexible extension plate 1322. Among them, multiple conductive layers (such as Figure 8 The conductive layer 15101, the conductive layer 15102, the conductive layer 15103, the conductive layer 15104), and multiple insulating layers (such as Figure 8The flexible extension plate 1322 may be provided with a first flexible covering layer 1631, a second flexible covering layer 1632, a first adhesive layer 1621, and a second adhesive layer 1622.

[0145] and Figures 5 to 7 The battery protection board 320 shown is different. Figures 8 to 11 The battery protection plate 1320 shown may include a first conductive layer 1410, a second conductive layer 1420, a third conductive layer 1450, a first flexible insulating layer 1430, and a second flexible insulating layer 1460, which are stacked. The second conductive layer 1420 may be located between the first conductive layer 1410 and the third conductive layer 1450. The first flexible insulating layer 1430 may be located between the first conductive layer 1410 and the second conductive layer 1420 to insulate the first and second conductive layers 1410 and 1420. The second flexible insulating layer 1460 may be located between the second conductive layer 1420 and the third conductive layer 1450 to insulate the second and third conductive layers 1420 and 1450. The first conductive layer 1410, the second conductive layer 1420, the third conductive layer 1450, the first flexible insulating layer 1430, and the second flexible insulating layer 1460 may be distributed over the hard protection plate 1321 and the flexible extension plate 1322.

[0146] like Figure 9 As shown, circuits may be arranged on the first conductive layer 1410 , the second conductive layer 1420 , and the third conductive layer 1450 .

[0147] The first conductive layer 1410 may include a first line 1411. The second conductive layer 1420 may include a plurality of control lines 1413. The third conductive layer 1450 may include a second line 1412. In one example, the first line 1411 may be a positive line, and the second line 1412 may be a negative line. In another example, the first line 1411 may be a negative line, and the second line 1412 may be a positive line.

[0148] To reduce the impedance of the battery assembly, the thickness, lateral dimensions, etc. of the first circuit 1411 and the second circuit 1412 can be relatively large, thereby facilitating an increase in the current flowing through the first circuit 1411 and the second circuit 1412. In other words, the first circuit 1411 and the second circuit 1412 can be relatively thick and relatively wide. In one example, most (i.e., more than half) or the entire area of ​​the first conductive layer 1410 can be used to form the first circuit 1411. In one example, most or all of the area of ​​the third conductive layer 1450 can be used to form the second circuit 1412. Optionally, the positive and negative circuits may not be provided on the second conductive layer 1420.

[0149] The control circuit 1413 can have relatively low impedance requirements. To reduce the overall thickness of the flexible extension board 1322, the thickness of the control circuit 1413 can be relatively small. In other words, the thickness of the second conductive layer 1420 can be relatively small. For example, the thickness of the second conductive layer 1420 can be less than the thickness of the first conductive layer 1410 or the third conductive layer 1450. Optionally, the majority of the control circuit 1413 of the flexible extension board 1322 can be disposed on the second conductive layer 1420.

[0150] The battery protection board 1320 may further include a plurality of pins. The plurality of pins may include, for example, a first pin 1445 , a second pin 1446 , and a plurality of control pins 1447 . The plurality of pins may be provided on, for example, the first conductive layer 1410 .

[0151] The first pin 1445 can be electrically connected to the first conductive layer 1410, and thus can be electrically connected to the first line 1411. When the first line 1411 is a positive line, the first pin 1445 can be a positive pin. When the first line 1411 is a negative line, the first pin 1445 can be a negative pin.

[0152] Second pin 1446 can be electrically connected to third conductive layer 1450 via fourth electrical connection path 1434, which passes through first flexible insulating layer 1430 and second flexible insulating layer 1460. This allows second pin 1446 to be electrically connected to second circuit 1412. Fourth electrical connection path 1434 can be formed by one or more electrical connectors. If second circuit 1412 is a negative circuit, second pin 1446 can be a negative pin. If second circuit 1412 is a positive circuit, second pin 1446 can be a positive pin.

[0153] Since the second pin 1446 is disposed on the first conductive layer 1410, and the second pin 1446 cannot be electrically connected to the first line 1411 on the first conductive layer 1410, the first conductive layer 1410 may include a first electrical connection area 1415 (such as a via pad). The second pin 1446 may be disposed on the first electrical connection area 1415. The first electrical connection area 1415 may be insulated from the first line 1411. Figure 9 A cross section of the flexible extension plate 1322 is observed in the X direction as shown. Figure 10 As shown in the cross-sectional view. Figure 10 As shown, a second pin 1446 may be provided on the first electrical connection region 1415 of the first conductive layer 1410, and a first insulating component 4161 may be provided between the first electrical connection region 1415 and the first line 1411. This can help prevent the second line 1412 from short-circuiting with the first line 1411.

[0154] The plurality of control pins 1447 can be electrically connected to the plurality of control circuits 1413 . The control pin 1447 can be electrically connected to one of the control circuits 1413 on the second conductive layer 1420 via the electrical connection path 1435 passing through the first flexible insulating layer 1430 .

[0155] Figure 11 yes Figure 8 BB cross-section shown.

[0156] Because multiple control circuits 1413 may be arranged on the second conductive layer 1420, and circuit gaps 1425 may exist between two adjacent control circuits 1413, the second conductive layer 1420 may form multiple circuit gaps 1425. Optionally, a third flexible insulating layer 1470 may be provided on the flexible extension plate 1322. The third flexible insulating layer 1470 may be located between the first flexible insulating layer 1430 and the second conductive layer 1420. The third flexible insulating layer 1470 may cover the side of the second conductive layer 1420 adjacent to the first flexible insulating layer 1430 and may fill the circuit gaps 1425 of the second conductive layer 1420. The third flexible insulating layer 1470 may be in contact with the second flexible insulating layer 1460.

[0157] exist Figure 11 In the example shown, third flexible insulating layer 1470 can be made of a photosensitive adhesive, thermosetting adhesive, epoxy resin, or other adhesive. By applying heat and pressure, third flexible insulating layer 1470 can fill circuit gaps 1425 in second conductive layer 1420 and adhere first flexible insulating layer 1430 and second conductive layer 1420 together.

[0158] In other examples, the third flexible insulating layer 1470 may include a first portion and a second portion. The materials of the first portion and the second portion may be different. The first portion may be an insulating ductile material having high ductility at high temperatures, such as ink having high ductility (the first portion may refer to Figures 5 to 7 The first portion may be non-adhesive. The first portion may fill the circuit gap 1425 of the second conductive layer 1420. The first portion may contact the second flexible insulating layer 1460. The second portion may be adhesive. The second portion may be used to adhere the first portion to the first flexible insulating layer 1430. The first portion may be made of a first material, and the second portion may be made of a second material. When the first and second materials are heated or processed, the viscosity of the first material is lower than that of the second material.

[0159] In one example, the thickness of first flexible cover layer 1631 can be approximately 12.5 μm. The thickness of second flexible cover layer 1632 can be approximately 12.5 μm. The thickness of first adhesive layer 1621 can be approximately 12.5 μm. The thickness of second adhesive layer 1622 can be approximately 12.5 μm. The thickness of first conductive layer 1410 can be approximately 90 μm. The thickness of second conductive layer 1420 can be approximately 20 μm. The thickness of third conductive layer 1450 can be approximately 90 μm. The thickness of first flexible insulating layer 1430 can be approximately 12.5 μm. The thickness of second flexible insulating layer 1460 can be approximately 25 μm. The thickness of third flexible insulating layer 1470 can be approximately 25 μm. The total thickness of flexible extension plate 1322 can be approximately 307.5 μm.

[0160] Because the control signals are placed separately on a conductive layer, the thickness of the conductive layer where the control signals reside can be relatively small. Consequently, the depth of the circuit gap 1425 formed by the conductive layer can be relatively small. This allows the insulating material to more easily fill the circuit gap 1425. Consequently, the thickness of the insulating material can be slightly reduced, thereby reducing the overall thickness of the flexible extension plate 1322. This relatively small thickness of the flexible extension plate 1322 improves its bendability, bending fatigue life, and assembly flexibility.

[0161] Figures 12 to 17 This is another battery protection board 2320 provided in the embodiment of the present application. The battery protection board 2320 can be applied to Figures 2 to 4 In any battery assembly 30. Figures 8 to 11 The battery protection board 1320 shown is similar, Figures 12 to 17 The battery protection plate 2320 shown can be divided into a hard protection plate 2321 and a flexible extension plate 2322. A plurality of conductive layers (such as Figure 12 The conductive layer 25101, the conductive layer 25102, the conductive layer 25103, the conductive layer 25104), and multiple insulating layers (such as Figure 12 The battery protection board 2320 may further include a first conductive layer 2410, a second conductive layer 2420, a third conductive layer 2450, a first flexible insulating layer 2430, a second flexible insulating layer 2460, and a third flexible insulating layer 2470. The first conductive layer 2410, the second conductive layer 2420, the third conductive layer 2450, the first flexible insulating layer 2430, and the second flexible insulating layer 2460 may be distributed over the rigid protection board 2321 and the flexible extension board 2322. The first conductive layer 2410 may include a first circuit 2411. The second conductive layer 2420 may include a plurality of control lines 2413. The third conductive layer 2450 may include a second line 2412. Figures 12 to 17 The relative positions of the first conductive layer 2410, the second conductive layer 2420, the third conductive layer 2450, the first flexible insulating layer 2430, the second flexible insulating layer 2460, and the third flexible insulating layer 2470 are shown. Figures 8 to 11 The relative positions of the first conductive layer 1410 , the second conductive layer 1420 , the third conductive layer 1450 , the first flexible insulating layer 1430 , the second flexible insulating layer 1460 , and the third flexible insulating layer 1470 are shown to be different.

[0162] exist Figures 12 to 17 In the illustrated example, the first conductive layer 2410 can be located between the second conductive layer 2420 and the third conductive layer 2450. That is, the conductive layer containing the first circuit 2411 can be located between the conductive layer containing the second circuit 2412 and the conductive layer containing the control circuit 2413. The control circuit 2413 can be located on the surface of the flexible extension plate 2332. The first flexible insulating layer 2430 can be located between the first conductive layer 2410 and the second conductive layer 2420 to insulate the first and second conductive layers 2410 and 2420. The second flexible insulating layer 2460 can be located between the first conductive layer 2410 and the third conductive layer 2450 to insulate the first and third conductive layers 2410 and 2450. The third flexible insulating layer 2470 can be attached between the first flexible insulating layer 2430 and the first conductive layer 2410.

[0163] like Figure 13As shown, the battery protection board 2320 may further include a plurality of pins. The plurality of pins may include, for example, a first pin 2445, a second pin 2446, and a plurality of control pins 2447. The plurality of pins may be provided on the second conductive layer 2420, for example.

[0164] The first pin 2445 may be electrically connected to the first conductive layer 2410 through the electrical connection path 2436 passing through the first flexible insulating layer 2430 , and thus the first pin 2445 may be electrically connected to the first line 2411 .

[0165] The second pin 2446 can be electrically connected to the third conductive layer 2450 through the fifth electrical connection path 2437 passing through the first flexible insulating layer 2430 and the second flexible insulating layer 2460 , so that the second pin 2446 can be electrically connected to the second circuit 2412 .

[0166] The plurality of control pins 2447 may be electrically connected to the plurality of control lines 2413 accordingly.

[0167] Since the fifth electrical connection path 2437 between the second pin 2446 and the second conductive layer 2420 can pass through the first conductive layer 2410, and the second pin 2446 cannot be electrically connected to the first line 2411 on the first conductive layer 2410, the fifth electrical connection path 2437 between the second pin 2446 and the second conductive layer 2420 can be insulated from the first line 2411 on the first conductive layer 2410 to prevent the second line 2412 from short-circuiting with the first line 2411. Figure 13 A cross section of the flexible extension plate 2322 is observed in the X direction as shown. Figures 14 to 16 The cross-sectional view shown.

[0168] like Figure 14As shown, the first conductive layer 2410 may include a second electrical connection region 2417. The fifth electrical connection path 2437 passing through the first flexible insulating layer 2430 and the second flexible insulating layer 2460 may include a first electrical connector 24371 and a second electrical connector 24372. The first electrical connector 24371 may pass through the first flexible insulating layer 2430 and the third flexible insulating layer 2470 and electrically connect between the second pin 2446 and the second electrical connection region 2417. The second electrical connector 24372 may pass through the second flexible insulating layer 2460 and electrically connect between the second trace 2412 and the second electrical connection region 2417. A second insulating member 4162 may be disposed in the space between the first trace 2411 and the second electrical connection region 2417 of the first conductive layer 2410. In other words, the second insulating member 4162 may fill the space between the first trace 2411 and the second electrical connection region 2417. The second insulating component 4162 can be connected between the first circuit 2411 and the second electrical connection area 2417. The second insulating component 4162 can be located between the first flexible insulating layer 2430 (or the third flexible insulating layer 2470) and the second flexible insulating layer 2460. This can help prevent short circuits between the second circuit 2412 and the first circuit 2411. In one example, the second electrical connection area 2417 can be circular. The second insulating component 4162 can be annular and arranged around the periphery of the second electrical connection area 2417. The outer surface of the second insulating component 4162 can contact the first circuit 2411. The inner surface of the second insulating component 4162 can contact the second electrical connection area 2417. The end surface of the second insulating component 4162 can contact the first flexible insulating layer 2430, the second flexible insulating layer 2460, or the third flexible insulating layer 2470. The end surface can be perpendicular to the side surface.

[0169] like Figure 15As shown, the battery protection board 2320 may include a third electrical connector 24373. The third electrical connector 24373 may pass through the first flexible insulating layer 2430, the second flexible insulating layer 2460, and the third flexible insulating layer 2470 to form the fifth electrical connection path 2437. A third insulating member 4163 may be disposed in the space between the first trace 2411 of the first conductive layer 2410 and the third electrical connector 24373. In other words, the third insulating member 4163 may fill the space between the first trace 2411 and the third electrical connector 24373. The third insulating member 4163 may be connected between the first trace 2411 and the third electrical connector 24373. The third insulating member 4163 may be located between the first flexible insulating layer 2430 (or the third flexible insulating layer 2470) and the second flexible insulating layer 2460. This may help prevent short circuits between the second trace 2412 and the first trace 2411. In one example, the third electrical connector 24373 may be cylindrical. The third insulating member 4163 can be annular and arranged around the outer circumference of the third electrical connector 24373. The outer side of the third insulating member 4163 can contact the first circuit 2411. The inner side of the third insulating member 4163 can contact the third electrical connector 24373. The end surface of the third insulating member 4163 can contact the first flexible insulating layer 2430, the second flexible insulating layer 2460, or the third flexible insulating layer 2470.

[0170] like Figure 16 As shown, the first conductive layer 2410 may include a second electrical connection area 2417. The fifth electrical connection path 2437 passing through the first flexible insulating layer 2430 and the second flexible insulating layer 2460 may include a fourth electrical connector 24374 and a fifth electrical connector 24375. The fourth electrical connector 24374 may pass through the first flexible insulating layer 2430 and the third flexible insulating layer 2470, and be electrically connected between the second pin 2446 and the second electrical connection area 2417. The fifth electrical connector 24375 may pass through the second flexible insulating layer 2460, and be electrically connected between the second line 2412 and the second electrical connection area 2417. The first flexible insulating layer 2430 or the second flexible insulating layer 2460 or the third flexible insulating layer 2470 may fill the space between the first line 2411 and the second electrical connection area 2417 of the first conductive layer 2410. As shown Figure 16As shown, the first portion of the second flexible insulating layer 2460 can fill the space between the first trace 2411 and the second electrical connection region 2417 of the first conductive layer 2410. The second portion of the second flexible insulating layer 2460 can cover both the second electrical connection region 2417 and the first trace 2411. The first portion of the second flexible insulating layer 2460 can be connected between the first trace 2411 and the second electrical connection region 2417. The first portion of the second flexible insulating layer 2460 can also be connected between the second portion of the first flexible insulating layer 2430 and the third flexible insulating layer 2470. This can help prevent short circuits between the second trace 2412 and the first trace 2411. In one example, the second electrical connection region 2417 can be circular. The first portion of the second flexible insulating layer 2460 can be annular and surround the outer circumference of the second electrical connection region 2417. The outer side of the first portion of the second flexible insulating layer 2460 can contact the first trace 2411. The inner side of the first portion of the second flexible insulating layer 2460 can contact the second electrical connection region 2417.

[0171] Figure 17 yes Figure 12 CC cross-section shown.

[0172] Because multiple control circuits 2413 can be arranged on the second conductive layer 2420, a circuit gap 2425 can exist between two adjacent control circuits 2413. Therefore, multiple circuit gaps 2425 can be formed in the second conductive layer 2420. The first adhesive layer 2621 of the flexible extension plate 2322 can cover the side of the second conductive layer 2420 away from the first flexible insulating layer 2430 and can fill the circuit gaps 2425 of the second conductive layer 2420. The first adhesive layer 2621 can be in contact with the first flexible insulating layer 2430.

[0173] exist Figure 17 In the example shown, by applying heat, pressure, etc., the first adhesive layer 2621 can fill the circuit gaps 2425 of the second conductive layer 2420 and can adhere the first flexible cover layer 2631 and the second conductive layer 2420 together.

[0174] In other examples, the battery protection plate 2320 may further include a first insulating extension layer (the first insulating extension layer may refer to Figures 5 to 7The first insulating extension layer 611 is shown. The first insulating extension layer can have high ductility at high temperatures. The first insulating extension layer can cover a side of the second conductive layer 2420 away from the first flexible insulating layer 2430 and can fill the circuit gaps 2425 of the second conductive layer 2420. The first insulating extension layer can contact the first flexible insulating layer 2430. The first adhesive layer 2621 can be attached between the first flexible covering layer 2631 and the first insulating extension layer.

[0175] In one example, the thickness of first flexible cover layer 2631 can be approximately 12.5 μm. The thickness of second flexible cover layer 2632 can be approximately 12.5 μm. The thickness of first adhesive layer 2621 can be approximately 20 μm. The thickness of second adhesive layer 622 can be approximately 12.5 μm. The thickness of first conductive layer 2410 can be approximately 90 μm. The thickness of second conductive layer 2420 can be approximately 20 μm. The thickness of third conductive layer 2450 can be approximately 90 μm. The thickness of first flexible insulating layer 2430 can be approximately 25 μm. The thickness of second flexible insulating layer 2460 can be approximately 12.5 μm. The thickness of third flexible insulating layer 2470 can be approximately 12.5 μm. The total thickness of flexible extension plate 2322 can be approximately 307.5 μm.

[0176] Because the control signals are placed separately on a conductive layer, the thickness of the conductive layer where the control signals reside can be relatively small. Consequently, the depth of the circuit gap 2425 formed by the conductive layer can be relatively small. This allows the insulating material to more easily fill the circuit gap 2425. Consequently, the thickness of the insulating material can be slightly reduced, thereby reducing the overall thickness of the flexible extension plate 2322. This relatively small thickness of the flexible extension plate 2322 improves its bendability, bending fatigue life, and assembly flexibility.

[0177] Optionally, in other examples, the number of conductive layers distributed on the flexible extension plate 2322 and the hard protective plate 2321 may be greater, for example, there may be 4 conductive layers, or more than 4 conductive layers.

[0178] Figure 6 、 Figure 9 、 Figure 13 The circuits shown can all be circuits with signal functions. In some examples, the conductive layer may include circuits without signal functions ( Figure 6 、 Figure 9 、 Figure 13 If these lines without signal functions are removed, the total thickness of the flexible extension board can be further reduced, thereby improving the bendability, bending fatigue life, and assembly flexibility of the flexible extension board.

[0179] Without substantially affecting impedance performance, the battery protection plate provided in the embodiments of the present application can have a relatively thin thickness. This helps reduce the space occupied by the battery protection plate within the electronic device, thereby providing space for other devices, such as batteries. Increasing the space occupied by the battery can help increase the battery capacity. In addition, the reduced thickness of the battery protection plate helps improve the flexibility of the battery protection plate, which in turn helps improve the bendability, bending fatigue life, and assembly flexibility of the flexible extension plate.

[0180] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery protection plate, wherein the battery protection plate (1320) can be divided into a hard protection plate (1321) and a flexible extension plate (1322), characterized in that: The battery protection board (1320) comprises: A first conductive layer (1410), a second conductive layer (1420), a third conductive layer (1450), a first flexible insulating layer (1430), and a second flexible insulating layer (1460) are stacked, wherein the first conductive layer (1410), the second conductive layer (1420), the third conductive layer (1450), the first flexible insulating layer (1430), and the second flexible insulating layer (1460) are all distributed on the hard protective plate (1321) and the flexible extension plate (1322), the second conductive layer (1420) is located between the first conductive layer (1410) and the third conductive layer (1450), and the first flexible insulating layer (1430) is located between the first conductive layer (1410) and the second conductive layer (1420). 0), the second flexible insulating layer (1460) is located between the second conductive layer (1420) and the third conductive layer (1450), a first circuit (1411) is arranged on the first conductive layer (1410), a plurality of control circuits (1413) are arranged on the second conductive layer (1420), a second circuit (1412) is arranged on the third conductive layer (1450), one of the first circuit (1411) and the second circuit (1412) is a positive circuit, and the other is a negative circuit, wherein the thickness of the first conductive layer (1410) is greater than the thickness of the second conductive layer (1420), and the thickness of the third conductive layer (1450) is greater than the thickness of the second conductive layer (1420).

2. The battery protection board according to claim 1, characterized in that: Two adjacent control circuits (1413) of the second conductive layer (1420) are arranged at intervals to form a circuit gap, and the battery protection board (1320) further includes: A third flexible insulating layer (1470), wherein the third flexible insulating layer (1470) is filled in the circuit gap and is pasted between the second conductive layer (1420) and the first flexible insulating layer (1430).

3. The battery protection board according to claim 2, characterized in that: The third flexible insulating layer (1470) comprises: A first part, the first part is filled in the line gap, and the material of the first part is a first material; The second part is pasted between the first part and the first flexible insulating layer (1430), and the material of the second part is a second material, wherein: When the first material and the second material are heated, the viscosity of the first material is lower than the viscosity of the second material.

4. The battery protection board according to claim 3, characterized in that: The first material includes one or more of the following: polyimide PI, ink.

5. The battery protection board according to claim 3 or 4, characterized in that: The second material includes one or more of the following: thermosetting adhesive, photosensitive adhesive, and epoxy resin.

6. The battery protection board according to any one of claims 1 to 4, characterized in that: The first conductive layer (1410) is provided with pins, and the battery protection board (1320) further comprises: a fourth electrical connection path (1434), the fourth electrical connection path (1434) passing through the first flexible insulating layer (1430) and the second flexible insulating layer (1460), and used for electrically connecting the pin to the second circuit (1412); A first insulating component (4161), wherein the first insulating component (4161) is disposed in the first conductive layer (1410), between the fourth electrical connection path (1434) and the first circuit (1411), and is used to separate the fourth electrical connection path (1434) from the first circuit (1411).

7. A battery protection plate, wherein the battery protection plate (2320) can be divided into a hard protection plate (2321) and a flexible extension plate (2322), characterized in that: The battery protection board (2320) comprises: A first conductive layer (2410), a second conductive layer (2420), a third conductive layer (2450), a first flexible insulating layer (2430), and a second flexible insulating layer (2460) are stacked, wherein the first conductive layer (2410), the second conductive layer (2420), the third conductive layer (2450), the first flexible insulating layer (2430), and the second flexible insulating layer (2460) are all distributed on the hard protective plate (2321) and the flexible extension plate (2322), the first conductive layer (2410) is located between the second conductive layer (2420) and the third conductive layer (2450), and the first flexible insulating layer (2430) is located between the first conductive layer (2410) and the second conductive layer (2420). 0), the second flexible insulating layer (2460) is located between the first conductive layer (2410) and the third conductive layer (2450), the first conductive layer (2410) is provided with a first circuit (2411), the second conductive layer (2420) is provided with a plurality of control circuits (2413), the third conductive layer (2450) is provided with a second circuit (2412), one of the first circuit (2411) and the second circuit (2412) is a positive circuit, and the other is a negative circuit, wherein the thickness of the first conductive layer (2410) is greater than the thickness of the second conductive layer (2420), and the thickness of the third conductive layer (2450) is greater than the thickness of the second conductive layer (2420).

8. The battery protection board according to claim 7, characterized in that: Two adjacent control circuits (2413) of the second conductive layer (2420) are arranged at intervals to form a circuit gap, and the battery protection board (2320) further includes: A first insulating extension layer, wherein the first insulating extension layer is filled in the circuit gap, and the material of the first insulating extension layer is a first material; A first flexible covering layer (2631), wherein the first flexible covering layer (2631) is located on a surface of the flexible extension plate (2322); A first adhesive layer (2621), the first adhesive layer (2621) is adhered between the first flexible covering layer (2631) and the first insulating extension layer, the material of the first adhesive layer (2621) is the second material, wherein: When the first material and the second material are heated, the viscosity of the first material is lower than the viscosity of the second material.

9. The battery protection board according to claim 8, characterized in that: The first material includes one or more of the following: polyimide PI, ink.

10. The battery protection board according to claim 8 or 9, characterized in that: The second material includes one or more of the following: thermosetting adhesive, photosensitive adhesive, and epoxy resin.

11. The battery protection board according to any one of claims 7 to 9, characterized in that: The first conductive layer (2410) is provided with a pin (2446), and the battery protection board (2320) further includes: a fifth electrical connection path (2437), the fifth electrical connection path (2437) passing through the first flexible insulating layer (2430) and the second flexible insulating layer (2460), and used for electrically connecting the pin (2446) to the second circuit (2412); A second insulating component (4162), the second insulating component (4162) is arranged in the first conductive layer (2410), located between the fifth electrical connection path (2437) and the first circuit (2411), and is used to separate the fifth electrical connection path (2437) from the first circuit (2411).

12. The battery protection board according to claim 11, characterized in that: The fifth electrical connection path (2437) comprises: an electrical connection region (2417), the electrical connection region (2417) being arranged in the first conductive layer (2410) and spaced apart from the first line (2411), the second insulating component (4162) being located between the first line (2411) and the electrical connection region (2417); A first electrical connector (24371) passes through the first flexible insulating layer (2430) and is electrically connected between the pin (2446) and the electrical connection area (2417); The second electrical connector (24372) passes through the second flexible insulating layer (2460) and is electrically connected between the electrical connection area (2417) and the second line (2412).

13. The battery protection board according to claim 11, characterized in that: The fifth electrical connection path (2437) comprises: A third electrical connector (24373), the third electrical connector (24373) passes through the first flexible insulating layer (2430), the second flexible insulating layer (2460), and is electrically connected between the pin (2446) and the second circuit (2412), wherein: The second insulating component (4162) is located between the first flexible insulating layer (2430) and the second flexible insulating layer (2460), and between the first circuit (2411) and the third electrical connector (24373), and is used to separate the third electrical connector (24373) from the first circuit (2411).

14. The battery protection board according to any one of claims 7 to 9, characterized in that: The first conductive layer (2410) is provided with a pin (2446), and the battery protection board (2320) further includes: a fifth electrical connection path (2437), the fifth electrical connection path (2437) passing through the first flexible insulating layer (2430) and the second flexible insulating layer (2460), and used for electrically connecting the pin (2446) to the second circuit (2412); The first flexible insulating layer (2430) or the second flexible insulating layer (2460) is filled between the fifth electrical connection path (2437) and the first circuit (2411) to separate the fifth electrical connection path (2437) from the first circuit (2411).

15. A battery assembly, characterized in that: The invention comprises a battery (310) and a battery protection board, wherein the battery protection board is electrically connected to the positive electrode and the negative electrode of the battery (310), and the battery protection board is the battery protection board (1320) described in any one of claims 1 to 6, or the battery protection board (2320) described in any one of claims 7 to 14.

16. An electronic device, characterized in that: The invention comprises a battery (310) and a battery protection board, wherein the battery protection board is electrically connected to the positive electrode and the negative electrode of the battery (310), and the battery protection board is the battery protection board (1320) described in any one of claims 1 to 6, or the battery protection board (2320) described in any one of claims 7 to 14.

Images