Battery protection assembly, battery and electronic equipment

Abstract

The utility model provides a battery protection assembly, a battery and electronic equipment. The battery protection assembly comprises a flexible circuit board; the battery protection module comprises a printed circuit board and a plurality of electronic devices, the printed circuit board is provided with a first surface and a second surface which are deviated from each other, the electronic devices are installed on the first surface and the second surface respectively, the second surface is provided with a welding element, and the welding element is connected with the flexible circuit board in a welding mode. Through the arrangement, the sizes of the printed circuit board in the length direction and the width direction can be fully utilized, the area of the printed circuit board is reduced, the volume of the battery protection module is greatly reduced, a larger space is reserved for the battery core, and the battery capacity is favorably increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery protection assembly, a battery and an electronic device. BACKGROUND

[0002] At present, the battery of an electronic device usually includes a battery cell and a battery protection plate, and the size of the battery cell determines the size of the battery capacity. In the related art, the battery protection plate has a large volume and occupies a large space in the electronic device, which further reduces the space reserved for the battery cell in the electronic device and affects the battery capacity. CONTENT

[0003] In view of this, the present application provides a battery protection assembly, a battery and an electronic device, which can reduce the space occupied by the battery protection assembly and is beneficial to increasing the battery capacity.

[0004] Specifically, the technical solutions include the following:

[0005] In a first aspect, the present application provides a battery protection assembly, which includes:

[0006] a flexible circuit board;

[0007] a battery protection module including a printed circuit board and a plurality of electronic devices, the printed circuit board having a first surface and a second surface facing away from each other, the plurality of electronic devices being respectively mounted on the first surface and the second surface, the second surface being provided with a welding element, and the welding element being connected to the flexible circuit board by welding.

[0008] In an optional embodiment, the battery protection module further includes a first injection molding layer, the first injection molding layer being located on the side of the printed circuit board on which the first surface is located, and the first injection molding layer being used to wrap the electronic devices mounted on the first surface.

[0009] And / or, the battery protection module further includes a second injection molding layer, the second injection molding layer being located on the side of the printed circuit board on which the second surface is located, and the second injection molding layer being used to wrap the electronic devices mounted on the second surface.

[0010] In an optional embodiment, at least part of the electronic devices are bonded to the first surface or the second surface by a bottom filling glue.

[0011] In an optional embodiment, the second injection molding layer is provided with a groove, the groove being arranged around one end of the welding element away from the second surface to expose at least part of the one end of the welding element away from the second surface.

[0012] In an alternative embodiment, the flexible circuit board comprises a main body portion and a branch portion connected to each other, the branch portion is bent relative to the main body portion, the main body portion is configured to be connected to the tab of the battery cell, and the battery protection module is arranged on the branch portion.

[0013] In an alternative embodiment, the battery protection module is a plurality of, and the plurality of battery protection modules are arranged on the branch portion at intervals.

[0014] In an alternative embodiment, the battery protection assembly further comprises a connector arranged on the branch portion, and at least one of the battery protection modules is arranged opposite to the connector along the thickness direction of the branch portion.

[0015] In an alternative embodiment, the battery protection assembly further comprises a reinforcing member, and at least one of the reinforcing members is arranged opposite to the battery protection module along the thickness direction of the branch portion.

[0016] In an alternative embodiment, the plurality of electronic devices are one or more of a coulometer, a protection IC, a field effect transistor, a capacitor, and a resistor.

[0017] In an alternative embodiment, the battery protection assembly has a coulometer branch, and the coulometer branch comprises a coulometer integrated with a protection IC, a first field effect transistor, and a second field effect transistor.

[0018] The coulometer has a charge control pin CHG and a discharge control pin DSG, the charge control pin CHG is connected to the first gate terminal of the first field effect transistor and the first gate terminal of the second field effect transistor respectively, the discharge control pin DSG is connected to the second gate terminal of the first field effect transistor and the second gate terminal of the second field effect transistor respectively, and the first field effect transistor and the second field effect transistor are connected in parallel.

[0019] In an alternative embodiment, the battery protection assembly further comprises a protection branch, and the protection branch comprises a protection IC, a third field effect transistor, and a fourth field effect transistor.

[0020] The protection IC has a charge output terminal and a discharge output terminal, the charge output terminal is connected to the first gate terminal of the third field effect transistor and the first gate terminal of the fourth field effect transistor respectively, the discharge output terminal is connected to the second gate terminal of the third field effect transistor and the second gate terminal of the fourth field effect transistor respectively, and the third field effect transistor and the fourth field effect transistor are connected in parallel.

[0021] In an optional embodiment, the battery protection assembly further comprises a positive electrode port and a negative electrode port, the first field effect transistor and the second field effect transistor are connected to the positive electrode port respectively, and the third field effect transistor and the fourth field effect transistor are connected to the negative electrode port respectively.

[0022] In a second aspect, the application provides a battery, comprising a battery protection assembly according to any one of the embodiments of the first aspect and a battery core, the battery core is provided with a tab, the tab extends outward from a first end surface of the battery core, and the tab is electrically connected to the flexible circuit board of the battery protection assembly.

[0023] In an optional embodiment, the flexible circuit board comprises a main body part and a branch part connected to each other, the branch part is bent relative to the main body part, the main body part is connected to the tab, and the battery protection module is arranged on the branch part.

[0024] The main body part is parallel to the first end surface or is inclined to the first end surface.

[0025] In a third aspect, the application provides an electronic device, comprising the battery according to any one of the embodiments of the second aspect.

[0026] The technical scheme provided by the embodiments of the application has at least the following beneficial effects: compared with the prior art of installing electronic devices on one surface, the technical scheme can make full use of the length and width of the printed circuit board, can greatly reduce the volume of the battery protection module by reducing the area of the printed circuit board, can reserve more space for the battery core, can increase the capacity of the battery, can achieve the maximum battery packaging space, and can also help to reduce the cost and weight. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 Some structural diagrams of the battery protection plate in the prior art are shown, wherein Fig. (a) is a structural diagram of the front surface of the battery protection plate, Fig. (b) is a structural diagram of the back surface of the battery protection plate, and Fig. (c) is a structural diagram of the side surface of the battery protection plate.

[0029] Figure 2 Some connection diagrams of the battery and the main board in the prior art are shown.

[0030] Figure 3Fig. 1 is a schematic view of a battery and a mainboard in the prior art;

[0031] Figure 4 Fig. 2 is a schematic view of a battery protection module according to an embodiment of the present application;

[0032] Figure 5 Fig. 3 is a schematic view of a battery protection module according to another embodiment of the present application;

[0033] Figure 6 Fig. 4 is a schematic view of a battery protection module according to yet another embodiment of the present application;

[0034] Figure 7 Fig. 5 is a perspective view of a battery protection module according to an embodiment of the present application;

[0035] Figure 8 Fig. 6 is another perspective view of a battery protection module according to an embodiment of the present application;

[0036] Figure 9 Fig. 7 is a schematic view of a battery protection module and a mainboard according to an embodiment of the present application;

[0037] Figure 10 Fig. 8 is a schematic view of a circuit of a battery protection module according to an embodiment of the present application;

[0038] Figure 11 Fig. 9 is a schematic view of a battery cell according to an embodiment of the present application;

[0039] Figure 12 Fig. 10 is a schematic view of a partial structure of a battery according to an embodiment of the present application.

[0040] The reference signs in the figures respectively represent:

[0041] 1 - battery protection module;

[0042] 11 - flexible circuit board; 111 - main body part; 112 - branch part;

[0043] 12 - battery protection module; 1201 - function module; 1202 - power module; 121 - printed circuit board; 121a - first surface; 121b - second surface; 1211 - soldering element; 122 - electronic device; 123 - first injection layer; 124 - second injection layer; 1241 - groove; 125 - bottom filling glue;

[0044] 13 - connector;

[0045] 14 - reinforcing member;

[0046] 15 - electric quantity detection branch; 151 - electric quantity meter; 152 - first field effect transistor; 153 - second field effect transistor;

[0047] 16 - protection branch; 161 - protection IC; 162 - third field effect transistor; 163 - fourth field effect transistor;

[0048] 2 - battery cell; 21 - tab; 22 - first end face;

[0049] 3 - main board;

[0050] 100 - battery protection board; 200 - nickel sheet; 300 - flexible circuit board; 400 - printed circuit board; 500 - electronic device; 600 - connector; 700 - main board; 800 - battery cell; 801 - tab.

[0051] The specific embodiments of the present application have been shown in the above-described drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0053] The positional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally based on the relative relationship of the positions shown in the drawings, and these positional nouns are used only to more clearly describe the structure and the relationship between the structures, and are not intended to describe absolute positions. When the product is placed in different attitudes, the positions may change, for example, "upper" and "lower" may be interchanged.

[0054] Unless otherwise defined, all the technical terms used in the embodiments of the present application have the same meanings as commonly understood by those skilled in the art.

[0055] At present, the battery of an electronic device generally includes a battery cell and a battery protection board, and the size of the battery cell determines the size of the battery capacity. In the related art, the battery protection board has a large volume and occupies a large space in the electronic device, which further reduces the space reserved for the battery cell in the electronic device, affecting the battery capacity.

[0056] In some prior art, such as Figure 1 and Figure 2As shown, the battery protection plate 100 is located at the head of the battery cell 800, the battery protection plate 100 is electrically connected with the mainboard 700 of the electronic device through the connector 600 arranged on the flexible circuit board 300, and is electrically connected with the pole lug 801 of the battery cell 800 through the nickel sheet 200 on the flexible circuit board 300, the electronic device 500 is installed on one side of the printed circuit board 400 of the battery protection plate 100, the area of the printed circuit board 400 is relatively large, the space occupied by the battery protection plate 100 is relatively large, which is not conducive to improving the capacity of the battery.

[0057] In view of the above technical problems, the battery protection assembly 1 is provided. Figures 4 to 8 As shown, the battery protection assembly 1 provided by the embodiment of the present application comprises a flexible circuit board 11 and a battery protection module 12.

[0058] The flexible circuit board 11 is also provided with a nickel sheet, and the flexible circuit board 11 is welded with the pole lug 21 of the battery cell 2 through the nickel sheet.

[0059] As shown, Figures 4 to 6 The battery protection module 12 comprises a printed circuit board 121 and a plurality of electronic devices 122, the printed circuit board 121 has a first surface 121a and a second surface 121b which are away from each other, and the plurality of electronic devices 122 are respectively installed on the first surface 121a and the second surface 121b, the second surface 121b is provided with a welding element 1211, and the welding element 1211 is welded and connected with the flexible circuit board 11.

[0060] As shown, Figure 4 Figure 4 The vertical direction in the above is the thickness direction of the printed circuit board 121, and the first surface 121a and the second surface 121b are away from each other in the thickness direction of the printed circuit board 121.

[0061] In the existing battery protection plate 100, as shown in (c), Figure 1 The electronic device 500 is installed on the same side of the printed circuit board 400, and the other side of the printed circuit board 400 is welded with the flexible circuit board 300 through the solder pad, which makes the volume of the whole battery protection plate 100 larger.

[0062] And the battery protection assembly 1 provided by the present application, the first surface 121a and the second surface 121b are both installed with the electronic device 122, in the case that the number of the electronic device 122 is certain, the length and width dimensions of the printed circuit board 121 can be greatly reduced, and the volume of the battery protection module 12 is greatly reduced.

[0063] Among them, the height of the welding element 1211 is H1, the height of the electronic device 122 installed on the second surface 121b is H2, and H1>H2 is satisfied.

[0064] ​The height H1 of the soldering component 1211 is the dimension of the soldering component 1211 in the thickness direction of the printed circuit board 121. The height H2 of the electronic device 122 mounted on the second surface 121b is the dimension of the electronic device 122 in the thickness direction of the printed circuit board 121. By setting H1 > H2, normal connection between the battery protection module 12 and the flexible circuit board 11 is ensured, and collision between the flexible circuit board 11 and the electronic device 122 is avoided when the battery protection module 12 is mounted on the flexible circuit board 11.

[0065] For example, the electronic device 122 is mounted on the first surface 121a or the second surface 121b using surface mount technology (SMT).

[0066] For example, the soldering component 1211 is a solder ball. Specifically, before implanting the solder ball, solder pads are prepared in advance at the corresponding positions on the printed circuit board 121. Then, the solder ball is placed on the solder pad using a corresponding carrier, and the solder ball and the solder pad are soldered together by reflow soldering. In this case, the solder ball is implanted on the second surface 121b first, and then the electronic device 122 is mounted to avoid the electronic device 122 affecting the solder ball implantation process.

[0067] The battery protection component 1 provided in this application embodiment, by mounting electronic devices 122 on both the first surface 121a and the second surface 121b, can make better use of the dimensions of the printed circuit board 121 in both the length and width directions compared to the design of mounting electronic devices on only one side in the prior art. By reducing the area of ​​the printed circuit board 121, the volume of the battery protection module 12 can be greatly reduced, leaving more space for the battery cell 2, which is conducive to increasing battery capacity, achieving the ultimate battery packaging space benefit, and also helps to reduce costs and weight.

[0068] In a further embodiment, the battery protection module 12 further includes a first injection molding layer 123, which is located on the side of the first surface 121a on the printed circuit board 121, and is used to wrap the electronic device 122 mounted on the first surface 121a; and / or, the battery protection module 12 further includes a second injection molding layer 124, which is located on the side of the second surface 121b on the printed circuit board 121, and is used to wrap the electronic device 122 mounted on the second surface 121b.

[0069] like Figure 4 or Figure 5 As shown, the battery protection module 12 has a first injection molding layer 123 only on the side where the first surface 121a is located, which improves the connection strength between the electronic device 122 on the first surface 121a and the printed circuit board 121, and enhances the mechanical reliability of the electronic device 122 on the first surface 121a; asFigure 6 As shown, the battery protection module 12 is provided with a first injection molding layer 123 and a second injection molding layer 124, which improves the connection strength between the electronic devices 122 on the first surface 121a and the second surface 121b and the printed circuit board 121, and enhances the mechanical reliability of the electronic devices 122 on the first surface 121a and the second surface 121b.

[0070] For example, an electronic device 122 on the first surface 121a and / or the second surface 121b is encapsulated using an injection molding material such as epoxy resin to form a first injection molding layer 123 and / or a second injection molding layer 124.

[0071] Since the thickness of the printed circuit board 121 is usually small, by providing the first injection molding layer 123 and / or the second injection molding layer 124, it is possible to prevent the printed circuit board 121 from warping or being damaged by force when mounting electronic devices 122 on the first surface 121a and the second surface 121b.

[0072] In a further embodiment, at least a portion of the electronic device 122 is bonded to the first surface 121a or the second surface 121b via an underfill adhesive 125.

[0073] Underfill 125 (also known as underfill adhesive) is an underfill material used in electronic assembly. It can be cured by heating and can be cured quickly when heated to form a consistent and defect-free underfill layer. Underfill 125 is used to reinforce chip connections, protect circuits, relieve stress, improve packaging reliability, enhance process efficiency and product performance.

[0074] Optionally, such as Figure 4 As shown, the bottom of the electronic device 122 mounted on the first surface 121a and the electronic device 122 mounted on the second surface 121b are both filled with bottom filler 125, and the battery protection module 12 is provided with a first injection molding layer 123.

[0075] Optionally, such as Figure 5 As shown, the bottom of the electronic device 122 mounted on the first surface 121a is not filled with underfill adhesive 125, the battery protection module 12 is provided with a first injection molding layer 123, and the bottom of the electronic device 122 mounted on the second surface 121b is filled with underfill adhesive 125. Specifically, the first injection molding layer 123 is made of a small-diameter injection molding material, for example, an injection molding material with a diameter of about 20 micrometers. The electronic device 122 mounted on the first surface 121a can be filled with the injection molding material, eliminating the need for underfill adhesive 125.

[0076] Optionally, such as Figure 6As shown, the electronic device 122 mounted on the first surface 121a and the bottom of the electronic device 122 mounted on the second surface 121b are not filled with the bottom filling glue 125, and the battery protection module 12 is provided with the first injection layer 123 and the second injection layer 124. Specifically, the first injection layer 123 and the second injection layer 124 are both made of injection material with a small diameter, and the process of filling the bottom filling glue 125 is omitted.

[0077] In one embodiment, as shown in Figure 6 The second injection layer 124 is provided with a groove 1241, which is arranged around the end of the welding element 1211 away from the second surface 121b to expose at least a part of the end of the welding element 1211 away from the second surface 121b.

[0078] Specifically, after the second injection layer 124 is cured and formed, the second injection layer 124 is subjected to grinding and thinning treatment to expose the welding element 1211, and then laser grooving is performed around the welding element 1211 to further expose the welding element 1211, thereby improving the welding reliability of the welding element 1211 and the flexible circuit board 11.

[0079] In one embodiment, as shown in Figure 7 Or Figure 8 The flexible circuit board 11 includes a main body part 111 and a branch part 112 connected to each other, the branch part 112 is bent relative to the main body part 111, the main body part 111 is used to connect with the tab 21 of the battery cell 2, and the battery protection module 12 is arranged on the branch part 112.

[0080] Specifically, the main body part 111 is used to cover one of the end faces of the battery cell 2, for example, the end face where the tab 21 is located, which can save the space occupied by the battery protection assembly 1 at the head of the battery cell 2.

[0081] As shown in Figure 7 Or Figure 8 The branch part 112 extends outward relative to the main body part 111, as shown in Figure 9 The branch part 112 can be stacked and distributed with the mainboard 3 beside the battery cell 2, so that the battery protection module 12 is located on one side of the mainboard 3 in the thickness direction, does not occupy the space of the mainboard 3 itself, and improves the space utilization.

[0082] In some prior art, as shown in Figure 3As shown, in order to make full use of the space of the head of the battery cell 800, the battery protection plate 100 is designed as an external module, that is, all the electronic devices 500 of the battery protection plate 100 are installed on the mainboard 700 of the electronic device, and the battery protection plate 100 is connected with the tab 801 of the battery cell 800 by using the flexible circuit board 300. However, the design has the following defects: all the electronic devices 500 are moved to the mainboard 700, occupying the space of the mainboard 700; the connector 600 needs to be specially customized; the battery protection device is prone to short circuit and fire, burning the mainboard 700 and the flexible circuit board 300; the battery monomer cannot pass the safety regulation certification; and the battery without the power meter cannot monitor the whole life cycle of the battery monomer.

[0083] In the battery protection assembly 1 provided in the embodiment of the present application, the main body part 111 can cover one of the end faces of the battery cell 2, the battery protection module 12 is arranged on the branch part 112 and can be stacked with the mainboard 3, the electronic device 122 does not need to be installed on the mainboard 3 and will not occupy the space of the mainboard 3 itself; the connector 13 only needs to use a conventional board-to-board connector and does not need to be specially customized; the protection device and the power meter 151 in the battery protection module 12 are electrically connected with the battery cell 2 through the flexible circuit board 11, which can protect the battery cell 2 from current and voltage and monitor the whole life cycle of the battery cell 2. At the same time, when the head of the battery cell 2 is impacted, since the battery protection module 12 is not in the head space of the battery cell 2, the electronic device 122 in the battery protection module 12 will not be damaged and failed due to the impact.

[0084] In one embodiment, the battery protection module 12 is multiple, and the multiple battery protection modules 12 are distributed on the branch part 112.

[0085] The number of the battery protection module 12 can be set according to actual needs, and exemplarily, as shown in Figure 7 or Figure 8 As shown, the battery protection module 12 is two, one of which is a function module 1201, and the other is a power module 1202, the electronic device 122 in the function module 1201 includes a power meter 151 and a protection IC (integrated circuit, IC for short) 161, etc., and the electronic device 122 in the power module 1202 includes a field effect transistor (MOS tube) and a resistor, etc.

[0086] In this embodiment, the number of the battery protection module 12 can be flexibly set according to the environment of the whole machine, so that the battery protection module 12 can better adapt to the environment of the whole machine.

[0087] Further, the battery protection assembly 1 further comprises a connector 13 arranged on the branch part 112, and the at least one battery protection module 12 is arranged opposite to the connector 13 along the thickness direction of the branch part 112.

[0088] Exemplarily, the connector 13 is a board-to-board connector (BTB connector for short), which is used to realize the electrical connection between the flexible circuit board 11 and the main board 3 or other circuit boards.

[0089] As shown in Figure 8 , the functional module 1201 and the connector 13 are arranged on the two sides along the thickness direction of the branch part 112 respectively, that is, the functional module 1201 is located on the back of the connector 13.

[0090] Through the above arrangement, the battery protection module 12 and the connector 13 realize space sharing, which is beneficial to save the space occupied by the battery protection module 12.

[0091] In an embodiment, the battery protection assembly 1 further comprises a reinforcing member 14, and the at least one reinforcing member 14 is arranged opposite to the battery protection module 12 along the thickness direction of the branch part 112.

[0092] Exemplarily, the reinforcing member 14 is a steel plate, and the reinforcing member 14 is used to reinforce the local part of the flexible circuit board 11, so as to improve the strength and stability of the flexible circuit board 11.

[0093] As shown in Figure 7 , one of the reinforcing members 14 and the power module 1202 are arranged on the two sides along the thickness direction of the branch part 112 respectively, that is, the power module 1202 is located on the back of the reinforcing member 14. The reinforcing member 14 is also arranged on one side of the main body part 111, which is used to improve the strength and stability of the main body part 111.

[0094] Through the above arrangement, the battery protection module 12 and the reinforcing member 14 realize space sharing while improving the strength and stability of the flexible circuit board 11 by using the reinforcing member 14, which is beneficial to save the space occupied by the battery protection module 12.

[0095] In an embodiment, the plurality of electronic devices 122 are one or more of a power gauge 151, a protection IC 161, a field effect transistor, a capacitor and a resistor.

[0096] Further, as shown in Figure 10As shown, the battery protection assembly 1 has an electric quantity detection branch 15, which includes an electric quantity meter 151 of an integrated protection IC, a first field effect transistor 152 and a second field effect transistor 153. The first field effect transistor 152 is a MOS tube Q1, and the second field effect transistor 153 is a MOS tube Q2. The first field effect transistor 152 and the second field effect transistor 153 have the same structure and function, and can be used as switches to control the conduction or cutoff of the circuit, thereby outputting the required electric signal.

[0097] The electric quantity meter 151 has a charging control pin CHG and a discharging control pin DSG. The charging control pin CHG is connected to the first gate terminal of the first field effect transistor 152 and the first gate terminal of the second field effect transistor 153, respectively. The discharging control pin DSG is connected to the second gate terminal of the first field effect transistor 152 and the second gate terminal of the second field effect transistor 153, respectively. The first field effect transistor 152 and the second field effect transistor 153 are connected in parallel.

[0098] By connecting the first field effect transistor 152 and the second field effect transistor 153 in parallel, the internal resistance can be reduced, and the heat generation can be reduced.

[0099] The first gate terminal and the second gate terminal of the first field effect transistor 152 are control terminals of the charge-discharge channel of the first field effect transistor 152. The first gate terminal and the second gate terminal of the second field effect transistor 153 are control terminals of the charge-discharge channel of the second field effect transistor 153.

[0100] In the prior art, the battery protection circuit of the battery protection board 100 usually adopts an electric quantity meter of a protection IC, a protection IC and a protection IC without integration. The number of electronic devices 500 is large. In the embodiment of the present application, the electric quantity meter 151 integrated with the protection IC is adopted, which can save one protection IC, helps to reduce the number of electronic devices 122 and the space occupied by the battery protection module 12, and can realize the functions of electric quantity calculation, battery encryption and battery full life monitoring while having the battery protection function.

[0101] The fuel gauge 151 is used to monitor battery voltage, current, temperature, and other information, and to predict remaining battery capacity and battery health. With its integrated protection IC, the fuel gauge 151 provides comprehensive safety warnings and protections, covering voltage (overcharge, over-discharge), current (overcurrent during charging, overcurrent during discharging, short circuit), temperature (high cell temperature, low cell temperature, high temperature of the charging / discharging MOSFET), internal cell protection (internal short circuit), cell pairing protection (cell disconnection, battery imbalance), charging protection (overcharge voltage, precharge timeout, fast charge timeout, capacity overcharge), system protection (communication timeout, negative temperature coefficient thermistor disconnection, charging / discharging MOSFET failure, external secondary protection triggering, etc.), and the fuel gauge 151 itself, offering multi-faceted and full-function safety protection.

[0102] Compared to conventional fuel gauges without integrated protection ICs, the fuel gauge 151 in this embodiment has additional charging control pin CHG and discharging control pin DSG.

[0103] The charging control pin CHG is used to control the charging operation of the battery. When the charging control pin CHG is high, the fuel gauge 151 controls the first field-effect transistor 152 and the second field-effect transistor 153 to start the charging process and introduce charging current from the charger into the battery for charging. When the charging control pin CHG is low, it controls the first field-effect transistor 152 and the second field-effect transistor 153 to stop the charging process and stop the charging operation.

[0104] The discharge control pin DSG is used to control the battery discharge operation. When the discharge control pin DSG is high, the fuel gauge 151 controls the first field-effect transistor 152 and the second field-effect transistor 153 to start the discharge process, and the electrical energy in the battery is released through the discharge load. When the discharge control pin DSG is low, it controls the first field-effect transistor 152 and the second field-effect transistor 153 to stop the discharge process and stop the discharge operation.

[0105] For example, such as Figure 10 As shown, the BAT pin of the fuel gauge 151 is connected to resistor R4; the VDD pin is connected to capacitor C3; the VSS pin is grounded; the SRP pin is connected to resistor R7; the SRN pin is connected to resistor R8, and the other end of resistor R8 is connected to the second end of resistor Rs1; the TS pin is connected to the negative temperature coefficient thermistor NTC; the SCL pin is connected to resistor R10; the SDA / HDQ pin is connected to resistor R9; resistors R9 and R10 are respectively connected to the communication interface IIC; and the PACK pin is connected to resistor R5.

[0106] In a further embodiment, the battery protection assembly 1 further includes a protection branch 16, which includes a protection IC 161, a third field-effect transistor 162, and a fourth field-effect transistor 163. The third field-effect transistor 162 is a MOSFET Q3, and the fourth field-effect transistor 163 is a MOSFET Q4. The third field-effect transistor 162 and the fourth field-effect transistor 163 have the same structure and function, and can be used as switches to control the conduction or cutoff of the circuit, thereby outputting the required electrical signal. By connecting the third field-effect transistor 162 and the fourth field-effect transistor 163 in parallel, internal resistance can be reduced, and heat generation can be decreased.

[0107] The protection IC161 has a charging output terminal COUT and a discharging output terminal DOUT. The charging output terminal COUT is connected to the first gate terminal of the third field-effect transistor 162 and the first gate terminal of the fourth field-effect transistor 163, respectively. The discharging output terminal DOUT is connected to the second gate terminal of the third field-effect transistor 162 and the second gate terminal of the fourth field-effect transistor 163, respectively. The third field-effect transistor 162 and the fourth field-effect transistor 163 are connected in parallel.

[0108] The protection IC161 is used to monitor the battery's charge and discharge status, preventing overcharging, over-discharging, and overcurrent. Figure 10 As shown, the V- pin of the protection IC161 is connected to resistor R4; the VDD pin is connected to resistor R3; the VSS pin is grounded; and the CS pin is connected to the second end of resistor Rs1.

[0109] In a further embodiment, the battery protection assembly 1 further includes a positive terminal and a negative terminal, with the first field-effect transistor 152 and the second field-effect transistor 153 respectively connected to the positive terminal, and the third field-effect transistor 162 and the fourth field-effect transistor 163 respectively connected to the negative terminal.

[0110] Specifically, the positive terminal includes the positive terminal B+ of cell 2, the first positive terminal P1+, and the second positive terminal P2+, and the negative terminal includes the negative terminal B- of cell 2, the first negative terminal P1-, and the second negative terminal P2-.

[0111] like Figure 10 As shown, the positive terminal B+ of cell 2 can be connected to the first positive terminal P1+ and the second positive terminal P2+, respectively, and the negative terminal B- of cell 2 can be connected to the first negative terminal P1- and the second negative terminal P2-, respectively. A circuit can be formed between the first positive terminal P1+ and the first negative terminal P1-; a circuit can be formed between the second positive terminal P2+ and the second negative terminal P2-.

[0112] like Figure 10As shown, one of the source terminals of the first field effect transistor 152 and the second field effect transistor 153 is connected with the positive pole B+ of the battery cell 2, and the other source terminal of the first field effect transistor 152 and the second field effect transistor 153 is connected with the first positive pole port P1+ or the second positive pole port P2+. One of the source terminals of the third field effect transistor 162 and the fourth field effect transistor 163 is connected with the negative pole B- of the battery cell 2, and the other source terminal of the third field effect transistor 162 and the fourth field effect transistor 163 is connected with the first negative pole port P1- or the second negative pole port P2-.

[0113] By connecting one group of MOS tubes (Q1 and Q2) with the positive pole port and connecting the other group of MOS tubes (Q3 and Q4) with the negative pole port, the layout of the electronic device 122 is more conducive, and the arrangement of the electronic device 122 is more compact and reasonable.

[0114] The embodiment of the present application also provides a battery, which comprises a battery cell 2 and the battery protection assembly 1 provided by any of the above embodiments. The battery cell 2 is provided with a tab 21, which extends outward from a first end surface 22 of the battery cell 2. The tab 21 is electrically connected with the flexible circuit board 11 of the battery protection assembly 1.

[0115] As shown in Figure 11 , the tab 21 is located at the head of the battery cell 2 and extends outward from the first end surface 22 of the battery cell 2. As shown in Figure 12 , the tab 21 is connected with the flexible circuit board 11. For example, the flexible circuit board 11 is provided with a nickel sheet, and the flexible circuit board 11 is welded with the tab 21 of the battery cell 2 through the nickel sheet.

[0116] In a further embodiment, as shown in Figure 12 , the flexible circuit board 11 comprises a main body part 111 and a branch part 112 connected with each other. The branch part 112 is bent relative to the main body part 111. The main body part 111 is connected with the tab 21, and the battery protection module 12 is arranged on the branch part 112. The main body part 111 is parallel to or inclined to the first end surface 22.

[0117] In this embodiment, the main body part 111 can be stacked with the first end surface 22, so as to at least partially cover the first end surface 22, thereby saving the space occupied by the battery protection assembly 1 at the head of the battery cell 2. Since the battery protection module 12 is arranged on the branch part 112, when the head of the battery cell 2 is impacted, the electronic device 122 in the battery protection module 12 will not be damaged and failed due to the impact.

[0118] The embodiment of the present application also provides an electronic device, which comprises the battery provided by any of the above embodiments.

[0119] Specifically, the electronic device further comprises a mainboard 3 located at one side of the battery cell 2 and close to the head of the battery cell 2, the battery protection module 12 on the branch part 112 of the flexible circuit board 11 is located at one side of the thickness direction of the mainboard 3, does not occupy the space of the mainboard 3 itself, and improves the space utilization in the electronic device, which is conducive to improving the capacity of the battery cell 2.

[0120] In this application, the terms "first" and "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited.

[0121] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope of the application being indicated by the following claims.

[0122] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.

Claims

1. A battery protection assembly (1) characterized in that, The battery protection assembly (1) comprises: a flexible circuit board (11); a battery protection module (12) comprising a printed circuit board (121) and a plurality of electronic devices (122), the printed circuit board (121) having a first surface (121a) and a second surface (121b) facing away from each other, the plurality of electronic devices (122) being respectively mounted on the first surface (121a) and the second surface (121b), the second surface (121b) being provided with a soldering element (1211) connected to the flexible circuit board (11) by soldering.

2. The battery protection assembly (1) according to claim 1, characterized in that The battery protection module (12) further comprises a first injection molding layer (123) located on the side of the printed circuit board (121) where the first surface (121a) is located, and the first injection molding layer (123) is used to wrap the electronic devices (122) mounted on the first surface (121a); and / or, the battery protection module (12) further comprises a second injection molding layer (124) located on the side of the printed circuit board (121) where the second surface (121b) is located, and the second injection molding layer (124) is used to wrap the electronic devices (122) mounted on the second surface (121b).

3. The battery protection assembly (1) according to claim 2, characterized in that At least part of the electronic devices (122) are bonded to the first surface (121a) or the second surface (121b) by a bottom filling glue (125).

4. The battery protection assembly (1) according to claim 2, characterized in that The second injection molding layer (124) is provided with a groove (1241) which is arranged around one end of the soldering element (1211) facing away from the second surface (121b) to expose at least part of the one end of the soldering element (1211) facing away from the second surface (121b).

5. The battery protection assembly (1) according to claim 1, characterized in that The flexible circuit board (11) comprises a main body portion (111) and a branch portion (112) connected to each other, the branch portion (112) is bent relative to the main body portion (111), the main body portion (111) is used to connect to the tab (21) of the battery cell (2), and the battery protection module (12) is arranged on the branch portion (112).

6. The battery protection assembly (1) according to claim 5, characterized in that The battery protection module (12) is a plurality of, and the plurality of battery protection modules (12) are distributed at intervals on the branch portion (112).

7. The battery protection assembly (1) according to claim 6, characterized in that The battery protection assembly (1) further comprises a connector (13) arranged on the branch portion (112), and at least one battery protection module (12) is arranged opposite the connector (13) along the thickness direction of the branch portion (112).

8. The battery protection assembly (1) according to claim 7, characterized in that The battery protection assembly (1) further comprises a reinforcing member (14), and at least one reinforcing member (14) is arranged opposite the battery protection module (12) along the thickness direction of the branch portion (112).

9. The battery protection assembly (1) according to claim 1, characterized in that The plurality of electronic devices (122) are one or more of a coulometer (151), a protection IC (161), a field effect transistor, a capacitor, and a resistor.

10. The battery protection assembly (1) according to claim 9, characterized in that The battery protection assembly (1) has an electric quantity detection branch (15), the electric quantity detection branch (15) includes an integrated protection IC electric quantity meter (151), a first field effect transistor (152) and a second field effect transistor (153); The electric quantity meter (151) has a charging control pin CHG and a discharging control pin DSG, the charging control pin CHG is connected with the first gate end of the first field effect transistor (152) and the first gate end of the second field effect transistor (153) respectively, the discharging control pin DSG is connected with the second gate end of the first field effect transistor (152) and the second gate end of the second field effect transistor (153) respectively, and the first field effect transistor (152) and the second field effect transistor (153) are connected in parallel.

11. The battery protection assembly (1) according to claim 10, characterized in that The battery protection assembly (1) further includes a protection branch (16), the protection branch (16) includes a protection IC (161), a third field effect transistor (162) and a fourth field effect transistor (163); The protection IC (161) has a charging output end and a discharging output end, the charging output end is connected with the first gate end of the third field effect transistor (162) and the first gate end of the fourth field effect transistor (163) respectively, the discharging output end is connected with the second gate end of the third field effect transistor (162) and the second gate end of the fourth field effect transistor (163) respectively, and the third field effect transistor (162) and the fourth field effect transistor (163) are connected in parallel.

12. The battery protection assembly (1) according to claim 11, characterized in that The battery protection assembly (1) further includes a positive electrode port and a negative electrode port, the first field effect transistor (152) and the second field effect transistor (153) are connected with the positive electrode port respectively, and the third field effect transistor (162) and the fourth field effect transistor (163) are connected with the negative electrode port respectively.

13. A battery, characterized by The battery includes a battery protection assembly (1) and a battery core (2), the battery protection assembly (1) is any one of claims 1-12, the battery core (2) is provided with a tab (21), the tab (21) extends outward from the first end surface (22) of the battery core (2), and the tab (21) is electrically connected with the flexible circuit board (11) of the battery protection assembly (1).

14. The battery of claim 13, wherein, The flexible circuit board (11) includes a main body part (111) and a branch part (112) connected with each other, the branch part (112) is bent relative to the main body part (111), the main body part (111) is connected with the tab (21), and the battery protection module (12) is arranged on the branch part (112). The main body part (111) is parallel to or inclined to the first end surface (22).

15. An electronic device, comprising: The electronic device includes the battery of claim 13 or 14.

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