WO2022242436A1

WO2022242436A1 - Battery protection board assembly, battery assembly and terminal

Info

Publication number: WO2022242436A1
Application number: PCT/CN2022/089359
Authority: WO
Inventors: 康月增; 杨江涛; 黄洲泓
Original assignee: 华为技术有限公司
Priority date: 2021-05-17
Filing date: 2022-04-26
Publication date: 2022-11-24
Also published as: CN115377618A; CN115377618B

Abstract

The present application relates to the technical field of batteries. Provided are a battery protection board assembly, a battery assembly and a terminal, which are used for increasing the capacity of a battery when the size of a mobile phone is fixed. The battery protection board assembly may comprise a flexible circuit board, tab pads, a first connector, a second connector and a battery packaged chip, wherein the flexible circuit board comprises a body portion, and a first extension portion and a second extension portion, which extend outwards from the body portion; the body portion is bent relative to the extension portions so as to attach to the surface, on which tabs are provided, of a battery cell; a first tab pad and a second tab pad are arranged on the body portion; the first connector is arranged on the first extension portion, and is electrically connected to the first tab pad and a main board; the second connector and the battery protection packaged chip are arranged on the second extension portion, and the battery protection packaged chip is electrically connected between the second tab pad and the second connector; and the parts, on which the battery protection packaged chip, the first connector and the second connector are arranged, of the extension portions and the main board are arranged in a stacked manner.

Description

A battery protection board assembly, battery assembly and terminal

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office on May 17, 2021, with application number 202110536275.7, and application name "A Battery Protection Board Assembly, Battery Assembly, and Terminal", the entire contents of which are incorporated by reference incorporated in this application.

technical field

The present application relates to the field of battery technology, in particular to a battery protection board assembly, a battery assembly and a terminal.

Background technique

With the popularity of full-screen mobile phones, users have higher and higher requirements for the screen ratio of mobile phones, and with the diversification of mobile phone functions, the power consumption of mobile phones is gradually increasing. Based on this, on the premise of satisfying the user experience, the size of the mobile phone cannot be further increased. Therefore, in the case of a certain volume of the mobile phone, as the space ratio of the camera and various functional modules in the mobile phone is increasing, the space occupied by the battery is limited. In this way, in the case of a certain battery energy density, it will not be able to meet the increasing power consumption of mobile phones.

Contents of the invention

The present application provides a battery protection plate assembly, a battery assembly and a terminal, which are used to increase the capacity of the battery when the size of the mobile phone is fixed.

In order to achieve the above object, the application adopts the following technical solutions:

In one aspect of the present application, a terminal is provided. The terminal includes a motherboard and a battery pack. The battery assembly includes a battery cell and a battery protection board assembly electrically connected to the battery cell. The battery protection board assembly may include a flexible circuit board, a first tab pad, a second tab pad, a first connector, a second connector and a battery packaging chip. Wherein, the flexible circuit board includes a main body and an extension extending outward from the main body. The extension includes a first extension and a second extension. The main body part is bent relative to the extension part, and at least part of the main body part is bonded to the surface of the electric core having the tab. The tab pad is disposed on the main body, and the first tab pad is configured to be electrically connected to the first tab. The second tab pad is configured to be electrically connected to the second tab. The first connector is disposed on the first extension part. The first connector is configured to be electrically connected to the main board, and the first connector is also electrically connected to the first tab pad through the flexible circuit board. The second connector is disposed on the second extension part and is configured to be electrically connected to the main board. The battery protection packaging chip is disposed on the second extension part. The battery protection package chip is electrically connected between the second tab pad and the second connector through the flexible circuit board. In the extension part, the part provided with the battery protection package chip, the first connector and the second connector is stacked with the main board.

From the above, it can be seen that, on the one hand, the main body of the flexible circuit board is bent relative to the extension to be attached to the surface of the battery cell having the first tab and the second tab, so that the main body is arranged perpendicular to the board surface of the main board , so that the size of the flexible circuit board in the plane where the board surface of the main board is located can be reduced. On the other hand, the components used to protect the electric core are integrated into an independent battery protection packaging chip, and the battery protection packaging chip is arranged on the second extension part of the flexible circuit board. In addition, the battery protection package chip can be stacked on the main board through the above-mentioned second extension part. Therefore, the size of the flexible circuit board in the plane where the board surface of the main board is located can be further reduced. In this way, the purpose of reducing the size of the flexible circuit board in the plane where the board surface of the main board is located is achieved by effectively utilizing the longitudinal space in the terminal perpendicular to the board surface of the main board. Moreover, the extra space in the battery protection plate assembly can be used to increase the size of the battery cell body, thereby achieving the purpose of increasing the battery capacity. Therefore, even if the internal components of the terminal have a certain space, by using the above-mentioned battery protection board assembly, the size of the battery cell body in the battery protection board assembly can be effectively increased, the battery capacity can be increased, and the problem of high power consumption of full-screen terminal products can be solved. question.

Optionally, the first connector is disposed at an end of the first extension part away from the main part. The second connector and the battery protection packaging chip are arranged at an end of the second extension part away from the main part. In this way, when the part of the flexible circuit board is stacked with the main board, the gap between the first extension part and the second extension part does not need to occupy the space of the main board.

Optionally, the main body includes a lug welding part, a first folding part and a second folding part. The lug welding part includes a first surface and a second surface opposite to each other; the first lug pad and the second lug pad are arranged on the first surface of the tab welding part. The first folding part is arranged at one end of the tab welding part and is connected with the first extending part. The first folding part is configured to be bent to the second surface of the tab welding part. The second folded portion is disposed at an end of the lug welding portion away from the first folded portion, and is connected to the second extension portion. The second folding part is configured to be bent to the second surface of the tab welding part. The second surface is used for bonding with the protective film. The first folding part can be bent to the back of the tab welding part. Similarly, the second folding part can also be bent to the back of the tab welding part. Therefore, the first extension part and the second extension part can be respectively bent to the outside of the protective film covering the lug welding part through the above-mentioned first folding part and the second folding part.

Optionally, the battery protection package chip, the first connector and the second connector are arranged on the same surface of the flexible circuit board. In this way, the battery protection package chip can be located between the middle frame and the flexible circuit board, thereby preventing the battery protection package chip from being exposed, so as to protect the battery protection package chip.

Optionally, the battery protection board assembly also includes a reinforcement board. The reinforcement board and the battery protection packaging chip are respectively arranged on two opposite surfaces of the flexible circuit board. The vertical projection of the battery protection package chip on the flexible circuit board overlaps with the vertical projection of the reinforcing plate on the flexible circuit board. The reinforcing plate can be made of hard resin material or metal material. The reinforcement plate and the battery protection package chip can be arranged on two opposite surfaces respectively. Moreover, the vertical projection of the battery protection packaged chip on the flexible circuit board overlaps with the vertical projection of the reinforcement board on the flexible circuit board, so that the positions of the reinforcement board and the battery protection package chip correspond, and then the battery protection package chip When the pins of the flexible circuit board are bound to the flexible circuit board, the reinforcement board can support the pins to improve the reliability of the chip binding.

Optionally, the first tab is a positive tab, and the first tab pad is a positive tab pad. The second tab is a negative tab, and the pad of the second tab is a pad of a negative tab. At this time, in the case that the transistors in the battery protection package chip are all N-type transistors, since the turn-on voltage of the N-type transistor is usually a positive voltage, the battery protection package chip is arranged between the negative tab and the second connector , when it is necessary to turn off the above-mentioned transistors, there is no need to provide a higher voltage.

Optionally, the packaged chip for battery protection includes a first current detection element and at least one level of protection circuit. The protection chip is electrically connected with the first current detection element and the first switch tube chip. The protection chip is configured to control the turn-on and turn-off of the first switch tube chip according to the current flowing through the first current detection element. The first switch tube chip is also electrically connected between the first current detection element and the second terminal of the battery protection package chip. In this way, the protection chip can calculate the current flowing through the first current detecting element according to the electrical signal or optical signal output by the first current detecting element, and compare the current flowing through the first current detecting element with the preset current gate Compare the limit value. For example, the preset current threshold value may include an over-current threshold, and when the protection chip calculates that the current flowing through the first current detection element exceeds the above-mentioned over-current threshold, it may control the first switch tube chip to be in a cut-off state, so that the second A current detection element is disconnected from the battery protection package chip. At this time, the battery cell body cannot be charged and discharged, so as to achieve the purpose of protecting the battery cell body. When the first switch tube chip is in the conduction state, the first switch tube chip can electrically connect the first current detection element and the battery protection package chip, so that the battery cell body can be charged and discharged.

Optionally, the packaged chip for battery protection further includes a second current detection element. The second current-sensing element is connected in parallel with the first current-sensing element to achieve the purpose of reducing impedance. The protection circuit also includes a second switch tube chip. The second switch tube chip is electrically connected to the second current detection element and the second end of the battery protection package chip, and the second switch tube chip is also electrically connected to the protection chip. The protection chip is further configured to control the turn-on and turn-off of the second switch tube chip according to the current flowing through the second current detection element. The first switching tube chip and the second switching tube chip are connected in parallel to achieve the purpose of reducing resistance.

Optionally, the at least one level of protection circuit includes a first level of protection circuit and a second level of protection circuit. The first switch tube chip in the first level protection circuit and the first switch tube chip in the second level protection circuit are connected in series between the first end and the second end of the battery protection package chip. In this way, when one of the above-mentioned two-level protection circuits fails, the other level of protection circuit can still effectively protect the battery body, thereby improving the reliability of the battery protection package chip to protect the battery. .

Optionally, the battery protection board assembly further includes a thermistor. The first thermistor is arranged at the second end of the battery protection package chip. The first thermistor is configured to detect the temperature of the battery protection package chip. In this case, the main board can calculate the current resistance of the first thermistor according to the current value of the first temperature detection terminal. Then the control chip can obtain a temperature matching the resistance value according to the resistance value, and use the temperature as the temperature inside the battery protection package chip. When the internal temperature of the battery protection package chip is high, the control chip can reduce the charging or discharging current of the battery core body.

Optionally, the battery protection board assembly further includes a second thermistor. The second thermistor is electrically connected to the first end of the battery protection package chip. The second thermistor is configured to detect the temperature of the first tab or the second tab. In this way, the main board can calculate the current resistance of the second thermistor through the current value of the second temperature detection terminal. Then the control chip can obtain the temperature of the first tab and the second tab according to the resistance value, which can be equivalent to the temperature of the cell body. When the temperature of the cell body is high, the control chip can reduce the charging or discharging current of the cell body.

Optionally, the first switching transistor chip includes: a first transistor, a second transistor, a first parasitic diode, and a second parasitic diode. The first transistor and the second transistor are connected in series. The first parasitic diode is connected in parallel with the first transistor, the second parasitic diode is connected in parallel with the second transistor, and the unidirectional conducting directions of the first parasitic diode and the second parasitic diode are opposite. In this case, by setting the unidirectional conduction direction of the first parasitic diode and the second parasitic diode in reverse, when the protection chip respectively controls the first transistor and the second transistor to be cut off, even if the first transistor and the second transistor are not To achieve an ideal completely cut-off state, the current cannot pass through the above-mentioned first parasitic diode and the second parasitic diode set in reverse, so as to ensure that the entire first switch tube chip can completely disconnect the second tab from the second connector .

Optionally, the first current detection element includes a resistor. In this way, the protection chip can collect the voltages at the first terminal and the second terminal of the first current-sensing element, and calculate the current flowing through the first current-sensing element according to the known resistance value of the first current-sensing element.

Optionally, the battery cell includes a battery cell body and a packaging film wrapping the battery cell body. The packaging film has a top seal portion on the top surface of the cell body, and the top seal portion is bent and bonded to the part of the packaging film covering the top surface of the cell body. The first tab and the second tab are arranged on the cell body and lead out from the top seal. The main body part is attached to the surface of the first tab, the second tab and the top sealing part away from the cell body. In this way, the main part of the flexible circuit board is bent relative to the extension part, and is attached to the surface of the battery core having the first tab and the second tab, so that the main part is arranged perpendicular to the board surface of the main board, thereby reducing the The size of the small flexible circuit board in the plane where the board surface of the motherboard is located.

Optionally, the first connector is disposed at an end of the first extension part away from the main part. The second connector and the battery protection packaging chip are arranged at an end of the second extension part away from the main part. The main body includes a lug welding part, a first folding part and a second folding part. The first tab pad and the second tab pad are disposed on the first surface of the tab welding portion. The first folding part is arranged at one end of the lug welding part and is connected with the first extension part; the second folding part is arranged at an end of the tab welding part away from the first folding part and is connected with the second extending part. The battery pack also includes a protective film. The first folding part and the second folding part are bent to the second surface of the tab welding part, the protective film is located between the first folding part and the second surface, and between the second folding part and the second surface, and the protective film covers Second surface and wrapping film. The first folding part can be bent to the back of the tab welding part. Similarly, the second folding part can also be bent to the back of the tab welding part. Therefore, the first extension part and the second extension part can be respectively bent to the outside of the protective film covering the lug welding part through the above-mentioned first folding part and the second folding part.

Optionally, the terminal further includes a middle frame. The motherboard and batteries are arranged in the middle frame. The battery protection package chip, the first connector and the second connector are arranged on the same surface of the flexible circuit board. The terminal also includes a first heat-conducting adhesive disposed between the battery protection package chip and the main board. In this way, since the main board is located on the middle frame, in this case, the heat generated by the chip in the battery protection package can be transferred to the main board through the heat-conducting adhesive. Then, the motherboard transfers the heat to the middle frame. Since the side of the middle frame is in contact with the outside, the heat inside the terminal can be effectively transferred to the environment outside the terminal, so as to achieve the purpose of effective heat dissipation.

Optionally, the terminal also includes a middle frame and a rear case. The main board and the electric core are arranged in the accommodation cavity formed between the middle frame and the rear shell. The first connector and the second connector are arranged on the same surface of the flexible circuit board, and the battery protection packaging chip and the first connector are respectively arranged on opposite surfaces of the flexible circuit board. The terminal also includes a second heat-conducting adhesive disposed between the battery protection package chip and the rear case. In this way, the heat generated by the chip in the battery protection package can be transferred to the rear shell through the second thermal conductive adhesive. Since the rear shell is in contact with the outside, the heat inside the terminal can be effectively transferred to the environment outside the terminal, so as to achieve the purpose of effective heat dissipation.

Optionally, the terminal further includes a first component and a second component disposed on a surface of the main board near the extension portion. The first component is located between the main board and the battery protection package chip. The vertical projection of the second component on the main board does not overlap with the vertical projection of the battery protection package chip on the main board. The thickness of the first component is smaller than the thickness of the second component. Wherein, the thickness direction is perpendicular to the board surface of the main board. In this case, the battery protection package chip can be stacked above the first component with a smaller thickness. At this time, the first component is located between the main board and the battery protection package chip. The vertical projection of the second component on the main board does not overlap with the vertical projection of the battery protection package chip on the main board. In this way, by stacking the battery protection package chip above the first component with a smaller thickness, the sum of the thickness of the battery protection package chip and the first component can be equal to the thickness of the second component on the motherboard. Equivalent thickness. Therefore, it is possible to avoid the problem that the battery protection packaging chip is stacked on the second component with a relatively high thickness, resulting in a large size of the terminal in the above-mentioned thickness direction.

In another aspect of the present application, a battery protection plate assembly is provided. The battery protection plate assembly is configured to be electrically connected with the cells of the battery assembly. The battery protection board assembly includes the battery protection board assembly may include a flexible circuit board, a first tab pad, a second tab pad, a first connector, a second connector, and a battery packaging chip. The flexible circuit board includes a main body and an extension extending outward from the main body, and the extension includes a first extension and a second extension. The main body part is bent relative to the extension part, and at least a part of the main body part is attached to the surface of the electric core having the first tab and the second tab. The tab pad is disposed on the main body. The tab pad includes at least a first tab pad and a second tab pad, the first tab pad is configured to be electrically connected to the first tab, and the second tab pad is configured to be connected to the second tab Ear connection. The first connector is disposed on the first extension part and is configured to be electrically connected to the main board, and the first connector is also electrically connected to the first tab pad through the FPC. The second connector is disposed on the second extension part and is configured to be electrically connected to the main board. The battery protection packaging chip is arranged on the second extension part; the battery protection packaging chip is electrically connected between the second tab pad and the second connector through the flexible circuit board. The technical effect of the above-mentioned battery protection board assembly is the same as that of the terminals provided in the foregoing embodiments, and details are not repeated here.

Another aspect of the present application provides a battery assembly, including a battery cell and any battery protection plate assembly as described above. The above-mentioned battery assembly has the same technical effect as that of the battery protection plate assembly provided in the foregoing embodiments, and details are not repeated here.

Description of drawings

FIG. 1 is a schematic structural diagram of a terminal provided in an embodiment of the present application;

Fig. 2 is a kind of structural schematic diagram of electric core in Fig. 1;

Fig. 3 is a schematic structural view of the battery protection board assembly in Fig. 1;

Fig. 4 is a schematic structural diagram of the electrical connection between the cell body and the main board through the FPC provided by the embodiment of the present application;

FIG. 5A is another structural schematic diagram of the electrical connection between the cell body and the main board through the FPC provided by the embodiment of the present application;

Fig. 5B is another schematic structural view of the cell provided by the embodiment of the present application;

FIG. 5C is another schematic structural view of the battery cell provided by the embodiment of the present application;

FIG. 5D is another structural schematic diagram of the electrical connection between the cell body and the main board through the FPC provided by the embodiment of the present application;

FIG. 5E is another structural schematic diagram of the electrical connection between the cell body and the main board through the FPC provided by the embodiment of the present application;

Figure 6A is a top view obtained along the S direction in Figure 5E;

Figure 6B is a side view obtained along the C direction in Figure 6A;

Fig. 7 is a schematic structural diagram of the electrical connection between the cell body and the main board provided by the embodiment of the present application;

FIG. 8A is another structural schematic diagram of the electrical connection between the cell body and the main board through the FPC provided by the embodiment of the present application;

FIG. 8B is a schematic diagram of a setting position of a battery protection package chip in a terminal;

8C is a schematic diagram of another setting position of the battery protection package chip in the terminal;

8D is a schematic diagram of another setting position of the battery protection package chip in the terminal;

8E is a schematic diagram of another setting position of the battery protection package chip in the terminal;

Fig. 9 is another structural schematic diagram of the battery protection board assembly in Fig. 1;

Fig. 10 is a structural schematic diagram of a part of the FPC in Fig. 9 after being bent;

FIG. 11 is a schematic structural diagram of the electrical connection between the FPC shown in FIG. 10 and the main board;

Fig. 12 is a schematic structural view of the protective film in Fig. 10;

Fig. 13 is another structural schematic diagram of the electrical connection between the cell body and the main board through the FPC provided by the embodiment of the present application;

Fig. 14 is another structural schematic diagram of the electrical connection between the cell body and the main board through the FPC provided by the embodiment of the present application;

Fig. 15 is another structural schematic diagram of the electrical connection between the cell body and the main board through the FPC provided by the embodiment of the present application;

FIG. 16 is a schematic structural diagram of a battery protection package chip provided by an embodiment of the present application;

Fig. 17 is a schematic diagram of another structure of a battery protection package chip provided by the embodiment of the present application;

Fig. 18 is another schematic structural diagram of a battery protection package chip provided by the embodiment of the present application;

Fig. 19 is another schematic structural diagram of a battery protection package chip provided by the embodiment of the present application;

FIG. 20 is another schematic structural diagram of a packaged chip for battery protection provided by an embodiment of the present application.

Reference signs:

01-terminal; 10-display screen; 11-middle frame; 12-back case; 13-mainboard; 14-components; 20-battery assembly; 21-cell; 22-battery protection board assembly; ;212-packaging film; 211a-positive ear; 211b-negative ear; 2121-top seal; 220-FPC; 2201-main body; 2202-extension; 222-connector; 222b-second connector; 2202a-first extension; 2202b-second extension; 141-first component; 142-second component; 30-protective film; 50-reinforcing board ;51-the first thermal adhesive; 52-the second thermal adhesive; 240-the tab welding part; 2nd fixed part; 303-covering part; 40-first current detection element; 41-protection circuit; 410-protection chip; 411-first switch tube chip; 412-second switch tube chip; 42-second current detection element.

Detailed ways

The following will describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them.

Hereinafter, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature.

In addition, in this application, directional terms such as "upper", "lower", "left", and "right" are defined relative to the schematic placement of components in the drawings. It should be understood that these directional terms are Relative concepts, which are used in the description and clarification of relative, may change accordingly according to changes in the orientation of parts placed in the drawings.

In this application, unless otherwise specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection, or It can be connected indirectly through an intermediary. also. The term "electrical connection" may refer to a direct electrical connection or an indirect electrical connection through an intermediary. Electrical signal transmission can be performed between components electrically connected to each other.

This embodiment of the application outputs a type of terminal. The terminal includes mobile phone (mobile phone), tablet computer (pad), TV, smart wearable products (for example, smart watch, smart bracelet), virtual reality (virtual reality, VR) terminal equipment, augmented reality (augmented reality AR) terminal Devices and other electronic products with rechargeable batteries. The above-mentioned terminal can also be electronic products such as charging small household appliances (such as soybean milk machines, sweeping robots), drones, etc. The embodiment of the present application does not specifically limit the specific form of the foregoing terminal. For the convenience of description, the following description is made by taking the mobile phone as shown in FIG. 1 as an example for the terminal 01 .

The structure of the above terminal 01 , as shown in FIG. 1 , may mainly include a display screen 10 , a middle frame 11 , and a rear case 12 . The display screen 10 is disposed on a side of the middle frame 11 away from the rear case 12 . In some embodiments of the present application, the above-mentioned display screen 10 may be a self-luminous display screen, for example, an organic light emitting diode (organic light emitting diode, OLED) display screen. Alternatively, in other embodiments of the present application, the display screen 10 may also be a liquid crystal display (liquid crystal display, LCD). The present application does not limit the type of the above-mentioned display screen 10 .

In addition, as shown in FIG. 1 , the above-mentioned terminal 01 may further include a main board 13 , a battery assembly 20 and components 14 . The motherboard 13 and the battery assembly 20 are disposed on the surface of the middle frame 11 near the rear case 12 . The above-mentioned components 14 are disposed on a side surface of the main board 13 close to the rear case 12 . As an example, the main board 13 may be a printed circuit board (printed circuit board, PCB). The component 14 may be a central processing unit (central processing unit, CPU), an application processor (application processor, AP), or a system-on-chip (system on chip, SOC), etc. Based on this, after the rear case 12 is fastened to the middle frame 11 , an accommodating chamber for accommodating the above-mentioned main board 13 , components 14 and battery assembly 20 can be formed between the rear case 12 and the middle frame 11 . In this way, the possibility of water vapor, oxygen, dust, etc. from the outside entering into the above-mentioned accommodation cavity can be reduced, so as to protect the components located in the above-mentioned accommodation cavity.

As shown in FIG. 1 , the battery assembly 20 may include a battery cell 21 and a battery protection plate assembly 22 . The battery cell 21 is used to supply power to the electronic components in the terminal 01 . Exemplarily, the battery cell 21 mentioned above may be a soft pack battery cell. In this case, as shown in FIG. 2 , the cell 21 may include a cell body 210, tabs (for example, positive tabs 211a and negative tabs 211b) disposed on the cell body 210, and wrapping the cell body 210. 212 of the wrapping film.

In some embodiments of the present application, the above-mentioned packaging film 212 may be an aluminum-plastic film. The packaging film 212 can be sealed on the top surface A and the side surface B of the cell body 210 . Wherein, the packaging film 212 is sealed on the top surface A of the cell body 210 to form a top seal portion 2121 . The positive tab 211 a and the negative tab 211 b can be drawn out of the packaging film 212 through the top seal 2121 .

It should be noted that the top surface A of the cell body 210 in the embodiment of the present application refers to the surface where the cell body 210 leads out from the tab 211 . In this case, the side B of the cell body 210 refers to the surface adjacent to the top surface A. As shown in FIG. In addition, the battery cell 21 in the embodiment of the present application may include at least one first tab and at least one second tab. The above-mentioned first tab may be a positive tab, and the second tab may be a negative tab. Alternatively, the first tab is a negative tab, and the second tab is a positive tab. For the convenience of description, the first tab is the positive tab 211 a shown in FIG. 2 , and the second tab is the negative tab 211 b shown in FIG. 2 as an example. In the case of sufficient space for the components of the battery assembly 20 in the terminal 01 , the greater the number of tabs, the more conducive to reducing the impedance of the battery assembly 20 during charging and discharging. The application does not limit the number of tabs. For the convenience of description, most of the embodiments below are described by taking the battery cell 21 including two positive tabs 211 a and two negative tabs 211 b as an example.

In addition, the battery protection board assembly 22 shown in FIG. 1 may include a flexible printed circuit (FPC) 220 as shown in FIG. 3 , at least one tab pad, a connector 222, and a battery protection package chip 223.

Wherein, the at least one tab pad may include at least one first tab pad and at least one second tab pad. The above-mentioned first tab pad is configured to be welded to the first tab so that the two are electrically connected. The second tab pad is configured to be electrically connected to the second tab. For example, in the case where the first tab is the positive tab 211a shown in FIG. 2 and the second tab is the negative tab 211b shown in FIG. 2 , the first tab pad can be the positive tab shown in FIG. 3 The pad 221a and the second tab pad may be the negative tab pad 221b shown in FIG. 3 .

As shown in FIG. 3 , the FPC 220 may include a main body 2201 and an extension 2202 extending outward from the main body. Tab pads (for example, a positive tab pad 221 a and a negative tab pad 221 b ) are disposed on the main body portion 2201 . In addition, the tab pads are configured to be welded to the aforementioned tabs, so that the cell body 210 can be electrically connected to the FPC 220 . It can be seen from the above that the battery cell 21 may include two positive tabs 211a and two negative tabs 211b, therefore the circuit board protection assembly 22 may include two positive tab pads 221a and two negative tab pads 221b. In this case, as shown in FIG. 4 , one positive tab pad 221 a may be welded to one positive tab 211 a. Similarly, one negative tab pad 221b can be welded to one negative tab 211b.

In addition, as shown in FIG. 3 , the connector 222 is disposed on the extension portion 2202 of the PFC 220 . The connector 222 can be inserted into the connector interface on the main board 13 , so that the FPC 220 can be electrically connected with the main board 13 . The battery protection board assembly 22 provided in the embodiment of the present application may include at least one connector 222 . For example, when the battery protection board assembly 22 includes a connector 222 , the connector 222 can be electrically connected to the positive voltage terminal and the negative voltage terminal of the mainboard 13 through the connector interface on the mainboard 13 to form an electrical signal loop.

Or, for another example, the above-mentioned battery protection board assembly 22 may include two connectors, respectively a first connector 222a and a second connector 222b as shown in FIG. 4 . In some embodiments of the present application, the above-mentioned FPC 220 may include two extension parts as shown in FIG. 4 , namely a first extension part 2202a and a second extension part 2202b. At this time, the above-mentioned first connector 222a may be disposed on the first extension portion 2202a, and the second connector 222b may be disposed on the second extension portion 2202b. In this case, the first connector 222a may be electrically connected to the positive voltage terminal of the motherboard 13, and the second connector 222b may be electrically connected to the negative voltage terminal of the motherboard 13, thereby forming an electrical signal loop.

Based on this, when the battery protection package chip 223 is electrically connected between the negative tab 211b and the second connector 222b, the first connector 222a may be disposed at the end of the first extension portion 2202a away from the main body 2201 . The second connector 222b and the battery protection package chip 223 may be disposed at an end of the second extension portion 2202b away from the main body portion 2201 . Alternatively, when the battery protection package chip 223 is electrically connected between the positive tab 211a and the first connector 222a, the first connector 222a and the battery protection package chip 223 may be disposed on the first extension portion 2202a away from the main body portion 2201 one end. The second connector 222b may be disposed at an end of the second extension portion 2202b away from the main body portion 2201 .

In this way, when part of the FPC 220 is stacked with the main board 13 , the gap between the first extension part 2202 a and the second extension part 2202 b does not need to occupy the space of the main board 13 . In addition, when the battery protection board assembly 22 includes two connectors 222, and each connector 222 is electrically connected to the positive voltage terminal and the negative voltage terminal in the motherboard 13 at the same time, in the battery protection board assembly 22, two Battery protection package chips 223 , each battery protection package chip 223 communicates with a part of one connector 222 that is electrically connected to the negative voltage terminal of the motherboard 13 . With respect to this solution, in the case where the battery protection board assembly 22 includes a first connector 222a and a second connector 222b, only one battery protection packaging chip 223 may be provided in the battery protection board assembly 22, and the The battery protection packaging chip 223 can be electrically connected between the negative electrode tab 211b and the second connector 222b, so that the number of battery protection packaging chips 223 can be reduced, which is beneficial to saving the space of components in the terminal 01.

It should be noted that, the present application does not limit the number of the above-mentioned connectors 222 . In the case that the battery assembly 20 has enough space for components in the terminal 01 , the more connectors 222 , it is beneficial to reduce the impedance generated by the battery assembly 20 during charging and discharging. For the convenience of description, the battery protection board assembly 22 includes a positive voltage terminal electrically connected to the second connector 222b, and the battery protection package chip 223 is electrically connected between the negative tab 211b and the second connector 222b as an example. illustrate.

In addition, in the drawings, for example, when the connector 222 and the battery protection package chip 223 on the extension part 2202 in FIG. The back of the FPC220. The positive tab pads 221a and negative tab pads 221b on the main body 2201 are shown in solid lines to illustrate that the positive tab pads 221a and negative tab pads 221b are arranged on the front of the FPC 220 shown in the drawings.

The above-mentioned battery protection packaging chip 223 can be packaged with multiple chips with different functions to form a system in package (SIP) to protect the battery cell 21 . In the figure, for the convenience of description, the battery protection package chip is represented by the abbreviation SIP. In this way, the battery protection package chip 223 can protect the battery cell 21 during the charging and discharging process of the battery cell 21 through the multiple chips integrated inside it, even if the battery cell 21 and the main board 13 are disconnected, thereby avoiding this problem. The battery cell 21 is in the state of overcharge, overdischarge, overcurrent, short circuit and ultra-high temperature charge and discharge.

Based on this, in order to increase the size of the battery cell 21 in the limited component space of the terminal 01 to increase the capacity of the battery cell 21, on the one hand, the main body 2201 in the FPC220 can be relative to the extension part 220 along the dotted line shown in FIG. bent. For example, as shown in FIG. 5A , the main body 2201 of the FPC 220 can be bent to be parallel or approximately parallel to the top surface A of the cell body 210 . In this way, the positive tab pad 221 a and the negative tab pad 221 b provided on the main body 2201 face the top surface A of the cell body 210 . At this time, the extensions in the FPC220 (including the first extension 2202a and the second extension 2202b) can be aligned with the board surface of the main board 13 (the XOY plane shown in FIG. 5A, which is the same as the board surface of the main board 13 in FIG. 5A Parallel) Parallel. In this case, the main body portion 2201 and the extension portion 220 of the FPC 220 may be perpendicular or approximately perpendicular.

In addition, it can be seen from the above that, as shown in FIG. 5B , the packaging film 212 in the cell 21 has a top seal portion 2121 on the top surface A of the cell body 210, and the tabs (positive tab 211a and negative tab 211b) are covered by the top seal portion 2121. lead out. In this case, the top sealing portion 2121 can be bent upward along the direction of the arrow shown in FIG. 5B . Then, as shown in FIG. 5C , the top sealing part 2121 can be bonded to the part of the packaging film 212 covering the top surface A of the cell body 210 . In this case, the top seal portion 2121 may be arranged along the thickness direction Z of the battery cell 21 and perpendicular to the XOY plane.

Next, as shown in FIG. 5D , the positive tab pad 221 a on the main body 2201 of the FPC 220 can be welded to the positive tab 211 a drawn from the top surface A of the cell body 210 . In addition, the negative tab pad 221b on the main body 2201 of the FPC 220 is welded to the negative tab 211b drawn out from the top surface A of the cell body 210 . Then, attach the main body 2201 of the FPC 220 to the surface of the cell 21 that has tabs (including the positive tab 211a and the negative tab 211b ), that is, the main body 2201 and the tab and the top sealing portion 2121 are away from the surface of the cell body 210 fit together.

As shown in FIG. 5E , after being bent, the main body portion 2201 of the FPC 220 can be attached to the surface of the battery cell 21 with tabs. It can be seen from the above that, as shown in FIG. 6A (the top view obtained along the S direction in FIG. 5E ), the top seal portion 2121 is perpendicular to the XOY plane, and the tab 211 is drawn out from the top seal portion 2121, so it is bent at the main body portion 2201 and connected to the electric current. When the surface of the core 21 with tabs 211 is bonded, the main body 2201 can be arranged parallel to the top seal 2121 , that is, as shown in FIG. In this way, the size of FPC 220 along the X direction can be reduced.

On the other hand, in order to increase the size of the battery cell 21 in the limited component space of the terminal 01 to increase the capacity of the battery cell 21, as shown in FIG. Specifically, as shown in FIG. 6A , the vertical projection of the portion of the extended portion 2202 of the FPC 220 on which the battery protection package chip 223 is placed on the surface of XOY is within the range of the vertical projection of the motherboard 13 on the surface of XOY. In this way, the battery protection package chip 223 can be stacked on the motherboard 13 , so that the size of the extension portion 2202 of the FPC 220 along the X direction can be reduced.

As can be seen from the above, as shown in FIG. 6B (the side view taken along the C direction shown in FIG. 6A ), on the one hand, the top seal portion 2121 of the battery cell 21 is arranged perpendicular to the XOY plane along the thickness direction Z of the battery cell 21 . In addition, after bending the main body 2201 of the FPC 220 perpendicular to the XOY plane along the thickness direction Z of the cell 21 , it is welded to the tab 211 drawn out from the top sealing portion 2121 . In this way, compared to the solution shown in FIG. 7 where the top sealing part 2121 and the PCB above the top sealing part 2121 are arranged horizontally (parallel to the XOY plane), in the battery assembly provided by the embodiment of the present application, the X In the same direction, the size H of the connecting portion between the FPC220 and the battery cell 21 is smaller.

On the other hand, compared to the solution shown in FIG. 7 , in which the components in the circuit for protecting the battery are arranged on the PCB, in the embodiment of the present application, as shown in FIG. 6B , the battery cell 21 The components for protection are integrated into an independent battery protection package chip 223 , and the battery protection package chip 223 is arranged on the extension part 2202 of the FPC220 . In addition, the battery protection package chip 223 can be stacked on the main board 13 through the extension portion 2202 . Therefore, the dimension H of the connecting portion between the FPC 220 and the battery core 21 can be further reduced.

To sum up, in the embodiment provided by this application, the battery cell 21 is electrically connected to the main board 13 by using the FPC 220 . In addition, by arranging a part of the FPC220, such as the above-mentioned main body part 2201, along the thickness direction Z of the battery cell 21, and disposing the battery protection packaging chip 223 in another part of the FPC220, such as the extension part 2202, to pass through the extension part 2202 The battery protection packaging chip 223 is stacked on the main board 13 along the thickness direction Z of the battery cell 21 .

In this way, the vertical space (the space where the thickness direction Z is located) perpendicular to the board surface (ie, the XOY plane) of the main board 13 in the terminal 01 is effectively utilized. Therefore, in the battery assembly, in the X direction, the dimension H of the connection portion between the FPC 220 and the battery cell 21 can be reduced. Moreover, in the X direction, the extra space can be used to increase the size of the cell body 210 , so as to achieve the purpose of increasing the battery capacity. Therefore, even if the internal components of the terminal 01, such as a mobile phone, have a certain space, by using the above-mentioned battery assembly 20, the size of the battery cell body 210 in the battery assembly 20 can be effectively increased, the battery capacity can be increased, and the power consumption of the full-screen terminal product can be solved. higher question.

In addition, the battery assembly 20 provided in the embodiment of the present application includes the battery cell 21 and the battery protection plate assembly 22, so the terminal 01 with the battery assembly 20 is in the process of production, transportation and assembly, the battery protection in the battery protection plate assembly 22 The packaged chip 223 can effectively protect the battery cell 21 and reduce the probability of safety accidents such as heating and fire of the battery cell 21 in the case of short circuit or impact. Thereby improving the safety performance of large-capacity terminal products.

Moreover, only one FPC 220 needs to be provided in the battery assembly 20 provided in the embodiment of the present application, which has a simple structure and a small volume. In addition, in the process of increasing the battery capacity in the embodiment of the present application, by reducing the size of the FPC used to electrically connect the battery cell 21 and the main board 13 in the horizontal direction (the above-mentioned X direction), there is no need to modify the electrode material in the battery cell 21. And the charging cut-off voltage of the battery cell 21 is improved, so that there is no need for a long research and development period, which is conducive to reducing the cost of the product.

It can be seen from the above that the battery protection packaging chip 223 is disposed on the extension portion 2202 , so that the battery protection packaging chip 223 is stacked on the main board 13 along the thickness direction Z of the battery cell 21 through the extension portion 2202 . In some embodiments of the present application, as shown in FIG. 8A , the battery protection package chip 223 and the connector 222 may be disposed on the same surface of the FPC 220 . In this way, the battery protection package chip 223 can be located between the middle frame 11 and the FPC 220 , thereby preventing the battery protection package chip 223 from being exposed, so as to protect the battery protection package chip 223 .

On this basis, in order to improve the heat dissipation performance of the battery protection package chip 223 , as shown in FIG. 8B , the terminal 01 may further include a first thermally conductive glue 51 arranged between the battery protection package chip 223 and the main board 13 . In this way, since the main board 13 is located on the middle frame 11 , in this case, the heat generated by the battery protection package chip 223 can be transferred to the main board 13 through the first heat-conducting glue 51 . Then, the main board 13 transfers the heat to the middle frame 11 . Since the side of the middle frame 11 is in contact with the outside, the heat inside the terminal 01 can be effectively transferred to the environment outside the terminal 01 to achieve the purpose of effective heat dissipation.

Alternatively, in other embodiments of the present application, as shown in FIG. 8C , the battery protection package chip 223 and the connector 222 may be disposed on the opposite surface of the FPC 220 . For example, when the connector 222 is arranged on the surface of the FPC220 close to the mainboard 13, the battery protection package chip 223 is arranged on the surface of the FPC220 away from the mainboard 13. In addition, since the surface of the FPC 220 away from the main board 13 is close to the rear shell 12, in order to improve the heat dissipation performance of the battery protection package chip 223, the above-mentioned terminal 01 may also include a second thermally conductive adhesive arranged between the battery protection package chip 223 and the rear shell 12 52. In this way, the heat generated by the battery protection package chip 223 can be transferred to the rear shell 12 through the second thermal conductive glue 52 . Since the rear shell 12 is in contact with the outside, the heat inside the terminal 01 can be effectively transferred to the environment outside the terminal 01 to achieve the purpose of effective heat dissipation.

On this basis, since the battery protection package chip 223 is arranged on the PFC220, the texture of the PFC220 is relatively soft. In addition, the above-mentioned battery protection plate assembly 22 may further include a reinforcing plate 50 as shown in FIG. 8B or 8C.

The reinforcing plate 50 can be made of hard resin material or metal material. The reinforcement board 50 and the battery protection packaging chip 223 may be respectively disposed on two opposite surfaces of the FPC 220 . Moreover, the vertical projection of the battery protection package chip 223 on the FPC220 overlaps with the vertical projection of the reinforcement board 50 on the FPC220, so that the positions of the reinforcement board 50 and the battery protection package chip 223 correspond, and then the battery protection package chip When the pins of 223 are bonded to the PFC220, the reinforcement board 50 can support the FPC220, improving the reliability of chip bonding.

In addition, it can be seen from the above that the battery protection package chip 223 can be stacked on the main board 13 along the thickness direction Z of the battery cell 21 through the extension portion 2202 . In this case, in order to prevent the size of the terminal 01 in the thickness direction Z from being large, the position where the battery protection package chip 223 is stacked above the main board 13 can be set.

For example, in some embodiments of the present application, the terminal 01 may further include a first component 141 and a second component 142 as shown in FIG. 8D . The above-mentioned first components 141 and second components 142 are both disposed on the side surface of the motherboard 13 close to the extension portion 2202 of the FPC as shown in FIG. 8E . Wherein, the above-mentioned first component 141 and the second component 142 have different thicknesses. For example, the thickness M1 of the first component 141 is smaller than the thickness M2 of the second component 142 . For example, the thickness M1 of the first component 141 may be less than 0.5 mm, and the thickness M2 of the second component 142 may be greater than 0.8 mm.

Wherein, the directions of the thickness M1 of the first component 141 and the thickness M2 of the second component 142 are perpendicular to the board surface of the main board 13 , that is, parallel to the thickness direction Z of the main board 13 .

In this case, the battery protection package chip 223 can be stacked above the first component 141 with a smaller thickness. At this time, as shown in FIG. 8E , the first component 141 is located between the motherboard 13 and the battery protection package chip 223 . The vertical projection of the second component 142 on the motherboard 13 does not overlap with the vertical projection of the battery protection package chip 223 on the motherboard 13 . In this way, by stacking the battery protection package chip 223 above the first component 141 with a smaller thickness, the thickness of the battery protection package chip 223 (for example, 1 mm) can be compared with the M1 of the first component 141 (for example, 0.5 mm). ) is equivalent to the thickness M2 of the second component 142 on the main board 13. Therefore, it is possible to avoid the problem that the battery protection packaging chip 223 is stacked on the second component 142 with a high thickness, resulting in a large size of the terminal 01 in the thickness direction Z mentioned above.

On this basis, after the battery cell 21 is electrically connected to the main board 13 through the FPC220, the connection part between the FPC220 and the battery cell 21 is protected. In some embodiments of the present application, the above-mentioned battery assembly 20 may also include The protective film 30. The protective film 30 can cover a part of the main body 2201 of the FPC 220 , and the top sealing portion 2121 and the tab 211 of the battery cell 21, so as to protect the part where the main body 2201 is connected to the tab 211 and prevent the battery assembly 20 from being produced. , transportation and assembly, the main body 2201 and the tab 211 are cracked.

In addition, in the case of having the above-mentioned protective film 30, in order to enable the FPC220 to be electrically connected to the main board 13, the extension 2202 of the FPC220, as shown in FIG. The protective packaged chip 223 and the connector 222 are stacked above the motherboard 13 .

Based on this, when the FPC220 includes the first extension part 2202a and the second extension part 2202b as shown in FIG. . Wherein, the positive tab pad 221 a and the negative tab pad 221 b are disposed on the front side of the tab welding portion 240 , that is, the first surface F1 . The first folding portion 241 is disposed at one end of the tab welding portion 240 and connected to the first extension portion 2202a. The second folded portion 242 is disposed at an end of the lug welding portion 240 away from the first folded portion 241 and connected to the second extension portion 2202b.

The protective film 30 may cover the position where the tab welding part 240 is located. In this case, the first folded portion 241 can be bent to the tab welded portion as shown in FIG. 240 (the second surface F2 as shown in FIG. 11 , the first surface F1 and the second surface F2 are arranged oppositely).

Similarly, bend the second folding portion 242 to the back of the tab welding portion 240 as shown in FIG. . Therefore, the first extension part 2202 a and the second extension part 2202 b can be bent to the outside of the protective film 30 through the first folding part 241 and the second folding part 242 respectively.

In addition, as shown in FIG. 9, the main body 2201 is bent along the direction of the arrow in the dotted line area between the main body 2201 and the extension (including the first extension 2202a and the second extension 2202b), as shown in FIG. 11 The vertical state shown. Therefore, the first connector 222a on the first extension 2202a , the second connector 222b on the second extension 2202b , and the battery protection package chip 223 can be stacked on the motherboard 13 .

In this case, as shown in FIG. 11 , when the first folded portion 241 and the second folded portion 242 are bent to the back side (second surface F2) of the tab welded portion 240, the first folded portion 241 and the tab welded portion 240 , and between the second folded portion 242 and the tab welding portion 240 there is a gap L. In this case, a part of the protective film 30 shown in FIG. Second surface F2. Therefore, the tab pad 221 on the tab welding portion 240 and the tab welded to the tab pad 221 can be protected by the protective film 30 .

In addition, in order to fix the above-mentioned protective film 30 , the protective film 30 may include a first fixing part 301 , a second fixing part 302 and a covering part 303 as shown in FIG. 12 . Wherein, the first fixing part 301 and the second fixing part 302 are provided with a sticking area 31 for sticking an adhesive layer.

In this way, the first fixing part 301 and the second fixing part 302 can be bent as shown in FIG. The second fixing portion 302 is vertical. Next, the first fixing part 301 and the second fixing part 301 can be attached to the first fixing part 301 and the second fixing part 302 along the arrow direction shown in The fixing part 302 is pasted on the packaging film 212 on the surface of the cell body 210 . In addition, the part of the protective film 30 located between the first fixing part 301 and the second fixing part 302 (that is, the covering part 303) can be located at the first folding part 241 and the second folding part 242 as shown in FIG. 15 respectively. The gap L between the second surface F2 and the second surface F2 is covered, so that the tab 211 and the part where the tab 211 is welded to the FPC can be protected.

It can be seen from the above that in the embodiment of the present application, the components used to protect the battery cell 21 are integrated into an independent battery protection package chip 223, and the battery protection package chip 223 is stacked on the main board 13 through the above-mentioned extension part 2202 superior. Therefore, the size H of the connection portion between the FPC 220 and the battery core 21 can be reduced. The specific structure of the battery protection package chip 223 will be illustrated in detail below.

In some embodiments of the present application, when the cell 21 includes a positive tab 211a and a negative tab 211b, and the battery protection plate assembly 22 includes a first connector 222a and a second connector 222b, as shown in FIG. 16 , The input terminal I of the battery protection package chip 223 may be electrically connected to the negative tab pad 221b, and the output terminal O of the battery protection package chip 223 may be electrically connected to the second connector 222b. The first connector 222a is electrically connected to the first connector 222a through the wiring in the FPC 220 .

Wherein, the battery protection package chip 223 may include a first current detection element 40 and at least one level of protection circuit 41 . The protection circuit 41 may include a protection chip 410 and a first switch chip 411 . The first end a1 of the first current-sensing element 40 is electrically connected to the input end I of the battery protection package chip 223 . The input terminal VI of the protection chip 410 is electrically connected to the second terminal a2 of the first current detection element 40 . The control terminal CT of the protection chip 410 is electrically connected to the control terminal G of the first switching tube chip 411 .

In this case, the protection chip 410 can be used to control the turn-on and turn-off of the first switch chip 411 according to the current flowing through the first current detection element 40 . The first electrode terminal P1 of the first switch tube chip 411 is electrically connected to the second terminal a2 of the first current detection element 40, the second electrode terminal P2 of the first switch tube chip 411 is connected to the output terminal VH of the protection chip 410, and the battery The output terminal O of the protection packaged chip 233 is electrically connected.

Based on this, when the first switch tube chip 411 is in the conduction state, the first switch tube chip 411 can electrically connect the second terminal a2 of the first current detection element 40 to the output terminal O of the battery protection package chip 233, so that The negative tab 211b is electrically connected to the second connector 222b for signal transmission. Or, when the first switch tube chip 411 is in the cut-off state, the first switch tube chip 411 can disconnect the second terminal a2 of the first current detection element 40 from the output terminal O of the battery protection package chip 233, so that the negative electrode tab 211b is disconnected from the second connector 222b. At this time, the battery cell body 210 cannot be charged and discharged.

In some embodiments of the present application, the above-mentioned first current detection element 40 may be a resistor as shown in FIG. 17 . In this case, the ground terminal GND of the protection chip 410 may be electrically connected to the first terminal a1 of the first current detection element 40 . In this way, the protection chip 410 can collect the voltages of the first terminal a1 and the second terminal a2 of the first current-sensing element 40, and calculate the voltage flowing through the first current-sensing element 40 according to the known resistance value of the first current-sensing element 40 40 current.

In this case, the protection chip 410 can compare the current flowing through the first current detection element 40 with a preset current threshold value. For example, the preset current threshold value may include an over-current threshold, and when the protection chip 410 calculates that the current flowing through the first current detection element 40 exceeds the above-mentioned over-current threshold, it may control the first switching tube chip 411 to be in a cut-off state, In order to disconnect the second terminal a2 of the first current-sensing element 40 from the output terminal O of the battery protection package chip 233, so that the negative tab 211b is disconnected from the second connector 222b. At this time, the battery cell body 210 cannot be charged and discharged, and the purpose of protecting the battery cell body 210 is achieved. In addition, the protection chip 410 can compare the current passing through the first current detection element 40 with the preset current threshold value, so as to prevent the battery cell 21 from being in the state of overcharge, overdischarge, short circuit, etc. The control process is the same as above. , which will not be repeated here.

The above description is made by taking the first current detection element 40 as a resistor as an example. In other embodiments of the present application, the first current detection element 40 may also be an inductor or a capacitor. The cell body 210 can calculate the current flowing through the first current-sensing element 40 by detecting the magnetic field generated by the first current-sensing element 40 . Alternatively, in some other embodiments of the present application, the above-mentioned current detection element 40 may also be a photoelectric sensor. The cell body 210 can calculate the current flowing through the first current detection element 40 by detecting the intensity of light generated by the photoelectric sensor. Other implementations of the first current-sensing element 40 will not be described here one by one.

In addition, in some embodiments of the present application, as shown in FIG. 17 , the first switch chip 411 may include a first parasitic diode D1 and a second parasitic diode D2 , and a first transistor M1 and a second transistor M2 connected in series. Wherein, the first parasitic diode D1 is a diode formed simultaneously when manufacturing the first transistor M1 , and the second parasitic diode D2 is a diode formed simultaneously when manufacturing the second transistor M2 .

A first pole of the first transistor M1 , for example, a source (source, s) can be used as a first electrode terminal P1 of the first switch chip 411 . The second pole of the first transistor M1, such as the drain (drain, d) is electrically connected to the first pole of the second transistor M2, such as the source s, and the second pole of the second transistor M2, such as the drain d, is used as the second pole. The second electrode terminal P2 of the switch tube chip 412 .

Based on this, the first switch chip 411 may include two control terminals, which are the first control terminal G1 and the second control terminal G2 respectively. The protection chip 410 may include two control terminals, respectively a third control terminal CT1 and a fourth control terminal CT2. Wherein, the gate (gate, g) of the first transistor M1 serves as the first control terminal G1 and is electrically connected to the third control terminal CT1 . The gate g of the second transistor M2 serves as the second control terminal G2 and is electrically connected to the fourth control terminal CT2. In this case, the protection chip 410 can control the on and off of the first transistor M1 by outputting a control signal to the first control terminal G1, and control the second transistor M2 by outputting a control signal to the second control terminal G2. on and off.

It should be noted that, the present application does not limit the types of the above-mentioned transistors, which may be N-type transistors or P-type transistors. In addition, the first pole of the transistor can be the above-mentioned source s, and the second pole can be the drain d. Or the first pole can be the drain d, and the second pole can be the source s.

In addition, the first parasitic diode D1 may be connected in parallel with the first transistor M1. The second parasitic diode D2 can be connected in parallel with the second transistor M2, and the unidirectional conducting directions of the first parasitic diode D1 and the second parasitic diode D2 are opposite. Exemplarily, as shown in FIG. 17, the anode (anode, a) of the first parasitic diode D1 is electrically connected to the first pole of the first transistor M1, such as the source s, and the cathode (cathode, c) of the first parasitic diode D1 It is electrically connected with the second pole of the first transistor M1, for example, the drain d. In addition, the anode a of the second parasitic diode D1 is electrically connected to the second pole of the second transistor M2, such as the drain d, and the cathode c of the second parasitic diode D2 is electrically connected to the first pole of the second transistor M2, such as the source s. connect.

In this case, by setting the unidirectional conducting direction of the first parasitic diode D1 and the second parasitic diode D2 in reverse, when the protection chip 410 controls the first transistor M1 and the first transistor M1 through the third control terminal CT1 and the fourth control terminal CT2 respectively. When the second transistor M2 is turned off, even if the first transistor M1 and the second transistor M2 do not reach the ideal completely cut-off state, the current cannot pass through the above-mentioned first parasitic diode D1 and the second parasitic diode D2 arranged in reverse, so that Ensure that the entire first switch chip 411 can completely disconnect the negative tab 211b from the second connector 222b.

In addition, the protection circuit further includes a capacitor C as shown in FIG. 17 , and the first end of the capacitor is electrically connected to the power supply terminal VDD of the protection chip 410 . The power supply terminal VDD of the protection chip 410 can be electrically connected to the positive tab 211 a through the positive tab pad on the FPC 220 . The second terminal of the capacitor C may be electrically connected to the ground terminal GND of the protection chip 410 and the first terminal a1 of the first current detection element.

On this basis, in order to further reduce the impedance between the cell body 210 and the connector, the battery protection package chip 223 may further include a second current detection element 42 as shown in FIG. 18 . The first terminal a3 of the second current-sensing element 42 is electrically connected to the first terminal a1 of the first current-sensing element 40 , and the second terminal a4 of the second current-sensing element 42 is electrically connected to the input terminal VI of the protection chip 410 . The second current-sensing element 42 is connected in parallel with the first current-sensing element 40, so that the purpose of reducing impedance can be achieved. Exemplarily, the second current detection element 42 may be the above-mentioned resistor, inductor, capacitor, or photoelectric sensor.

In addition, the above protection circuit 41 may further include a second switching tube chip 412 . The second switching tube chip 412 is connected in parallel with the first switching tube chip 411 . For example, the first electrode terminal P3 of the second switch tube chip 412 is electrically connected to the first electrode terminal P1 of the first switch tube chip 411 and the second terminal a4 of the second current detection element 42, and the second terminal a4 of the second switch tube chip 412 The two electrode terminals P4 are electrically connected to the second electrode terminal P2 of the first switch chip 411 .

In addition, the control terminal of the second switching transistor chip 412 is electrically connected to the control terminal of the protection chip 410 . The exemplary second switch chip 412 may also include two transistors connected in series, and parasitic diodes connected in parallel with the two transistors connected in series and oppositely arranged. In this case, the gates of the above-mentioned transistors can serve as two control terminals of the second switching transistor chip 412 , for example, the third control terminal G3 and the second control terminal G4 . The third control terminal G3 of the second switch chip 412 is electrically connected to the third control terminal CT1 of the protection chip 410 , and the fourth control terminal G4 of the second switch chip 412 is electrically connected to the fourth control terminal CT2 . In this way, the first switch tube chip 411 and the second switch tube chip 412 are connected in parallel, so that the purpose of reducing resistance can be achieved.

From the above, it can be seen that by adding the second current-sensing element 42 connected in parallel with the first current-sensing element 40 and the second switching tube chip 412 connected in parallel with the first switching tube chip 411, the distance between the cell body 210 and the connector can be reduced. the impedance between them. If the space of the internal components of the terminal 01 is allowed, the more components are connected in parallel with the first current-sensing element 40 and the first switching tube chip 411 , the smaller the impedance between the cell body 210 and the connector.

All of the above are described by taking the battery protection package chip 223 including the primary protection circuit 41 as an example. In other embodiments of the present application, in order to further improve the reliability of the battery protection package chip 223 to protect the battery cell 21, the battery protection package chip 223 may include a two-stage protection circuit as shown in FIG. The primary protection circuit 41a and the secondary protection circuit 41b.

It should be noted that the structure of the second-level protection circuit 41b may be the same as that of the first-level protection circuit 41a. For the convenience of description, the letter "a" is added after the numbers of the protection chip, the first switch chip and the second switch chip in the first-level protection circuit 41a, and the protection chip in the second-level protection circuit 41b, the first The letter "b" is added after the numbers of the switching tube chip and the second switching tube chip.

Based on this, the second electrode terminal P2 of the first switch tube chip 411a in the first-level protection circuit 41a is electrically connected to the first electrode terminal P1 of the first switch tube chip 411b in the second-level protection circuit 41b. The second electrode terminal P2 of the first switch transistor chip 411b in the second-level protection circuit 41b is electrically connected to the output terminal O of the battery protection package chip 223 . In this way, when one of the first-level protection circuits in the above-mentioned two-level protection circuits fails, the other-level protection circuit can still effectively protect the battery cell body 210, thereby improving the protection of the battery cell 21 by the battery protection packaging chip 223. reliability.

In addition, when the current flowing through the battery protection package chip 223 is large, in order to reduce the resistance, for example, the first switch tube chip 411a of the switch tube chip 223 in the battery protection package chip 223 may have multiple first electrode terminals P1 and multiple The second electrode terminal P2.

On this basis, in the process of charging and discharging the cell body 210, in order to avoid heating inside the battery protection package chip 223 and reduce the reliability of the protection of the cell body 210, the above-mentioned battery protection package chip 223 may also include a first thermal Sensitive resistance. The first thermistor may be a negative temperature coefficient thermistor (negative temperature coefficient, NTC). Hereinafter, the first thermistor will be referred to as NTC1 for short. As shown in FIG. 19 , the first end of the NTC1 is electrically connected to the output end O of the battery protection package chip 223 , and the second end of the NTC1 can be electrically connected to the first temperature detection end T1 of the main board 13 .

In this case, when the internal heat of the battery protection package chip 223 is higher, the resistance value of NTC1 will decrease. Since the voltage at both ends of NTC1 is constant, the control chip on the motherboard 13, such as the CPU, can pass the first temperature detection terminal T1 in real time. The obtained current value calculates the current resistance of NTC1. Then the control chip can obtain a temperature matching the resistance value according to the resistance value, and use the temperature as the temperature inside the battery protection package chip 223 . When the internal temperature of the battery protection packaging chip 223 is high, the control chip can reduce the charging or discharging current of the battery cell body 210 .

Alternatively, in other embodiments of the present application, the battery protection package chip 223 may further include a second thermistor, referred to as NTC2 hereinafter. As shown in FIG. 20 , the first end of the NTC2 is electrically connected to the input end I of the battery protection package chip 223 , and the second end of the NTC2 is electrically connected to the second temperature detection end T2 of the main board 13 . Similarly, the control chip on the main board 13 can calculate the current resistance of the NTC2 through the current value of the second temperature detection terminal T2. Then the control chip can obtain the temperature of the tab, such as the negative tab 211 b , according to the resistance value, which can be equivalent to the temperature of the cell body 210 . When the temperature of the cell body 210 is high, the control chip can reduce the charging or discharging current of the cell body 210 .

It should be noted that the above description is based on the example that both the first thermistor and the second thermistor are NTCs. In other embodiments of the present application, the above-mentioned first thermistor and the second thermistor It may also be a positive temperature coefficient thermistor (positive temperature coefficient, PTC). As the temperature of PTC increases, the resistance value will increase. The PTC detects the temperature of the battery protection package chip 223 and the cell body 210 in the same manner as described above, and will not be repeated here.

In addition, the embodiments of the present application are all described by taking the case where the battery protection package chip 223 is electrically connected to the negative tab 211b and the second connector 222b, and the positive tab 211a is directly electrically connected to the first connector 222a through the wire on the FPC220. . At this time, under the condition that the transistors in the battery protection package chip 223 are all N-type transistors, since the turn-on voltage of the N-type transistor is usually a positive voltage, the battery protection package chip 223 is arranged on the negative pole ear 211b and the second connection. Between the transistors 222b, when it is necessary to turn off the above-mentioned transistors, there is no need to provide a higher voltage. In other embodiments of the present application, the negative tab 211b may be directly electrically connected to the second connector 222b through the wire on the FPC 220 . The battery protection package chip 223 is electrically connected between the positive tab 211a and the first connector 222a.

It can be seen from the above that the battery protection package chip 223 provided in the embodiment of the present application integrates the protection chip 410, at least one switch tube chip (for example, the first switch tube chip 411 and the second switch tube chip 412 connected in parallel) and at least one heat sink chip. Varistors (for example, NTC1 and NTC2). In this way, the above-mentioned multiple chips and components can be packaged in the battery protection package chip 223 through a chip package process to realize normalization of modules, so that the space occupied by the battery protection package chip 223 is small. In addition, since the battery protection package chip 223 is stacked with the main board 13 , the normalized battery protection package chip 223 can effectively reduce the impact of the module protecting the battery body 210 in the terminal 01 on the space of the main board 13 . In addition, when the output of the terminal 01 is large, the application of the normalized battery protection package chip 223 in the terminal 01 can effectively reduce the cost.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims

A terminal, characterized in that it includes a main board and a battery assembly; the battery assembly includes a battery cell and a battery protection board assembly electrically connected to the battery cell;

The battery protection board assembly includes:

The flexible circuit board FPC includes a main body, an extension extending outward from the main body, the extension includes a first extension and a second extension; the main body is bent relative to the extension, at least Part of the main body part is bonded to the surface of the electric core having a first tab and a second tab;

The tab pad is arranged on the main body, the tab pad includes at least a first tab pad and a second tab pad, and the first tab pad is configured to be connected to the first tab pad. The tab is electrically connected, and the second tab pad is configured to be electrically connected to the second tab;

a first connector, disposed on the first extension part, configured to be electrically connected to the main board, and the first connector is also electrically connected to the first tab pad through the FPC;

a second connector, disposed on the second extension, configured to be electrically connected to the main board;

A battery protection package chip is disposed on the second extension; the battery protection package chip is electrically connected between the second tab pad and the second connector through the FPC;

Wherein, in the extension part, the part where the battery protection package chip, the first connector and the second connector are arranged is stacked with the main board.
The terminal according to claim 1, characterized in that,

The first connector is disposed at an end of the first extension part away from the main body part;

The second connector and the battery protection package chip are disposed at an end of the second extension part away from the main body part.
The terminal according to claim 2, characterized in that,

The main body includes:

The tab welding part includes opposite first surfaces and second surfaces; the first tab pad and the second tab pad are arranged on the first surface of the tab welding part;

The first folding part is arranged at one end of the tab welding part and connected to the first extension part; the first folding part is configured to be bent to the second part of the tab welding part. surface;

The second folding part is arranged at an end of the tab welding part away from the first folding part and is connected to the second extension part; the second folding part is configured to be bent to the tab The second surface of the soldering part; the second surface is configured to be attached to the protective film.
The terminal according to any one of claims 1-3, wherein the battery protection package chip, the first connector and the second connector are arranged on the same surface of the FPC.
The terminal according to claim 1, wherein the battery protection plate assembly further includes a reinforcing plate;

The reinforcement board and the battery protection packaging chip are respectively arranged on two opposite surfaces of the FPC; the vertical projection of the battery protection packaging chip on the FPC is the same as that of the reinforcement board on the FPC The vertical projections overlap.
The terminal according to any one of claims 1-5, characterized in that,

The first tab is a positive tab, and the first tab pad is a positive tab pad;

The second tab is a negative tab, and the second tab pad is a negative tab pad.
The terminal according to any one of claims 1-6, wherein the battery protection package chip comprises:

a first current-sensing element, electrically connected to the first end of the battery protection package chip;

At least one level of protection circuit, including a protection chip and a first switch chip;

Wherein, the protection chip is electrically connected to the first current detection element and the first switch tube chip; the protection chip is configured to control the first current detection element according to the current flowing through the first current detection element. On and off of the switch tube chip;

The first switch tube chip is also electrically connected between the first current detection element and the second terminal of the battery protection package chip.
The terminal according to claim 7, characterized in that,

The battery protection package chip also includes:

a second current-sensing element connected in parallel with the first current-sensing element;

The protection circuit also includes:

A second switch tube chip, the second switch tube chip is electrically connected to the second current detection element and the second end of the battery protection packaging chip, and the second switch tube chip is also connected to the protection The chips are electrically connected; the protection chip is further configured to control the turn-on and turn-off of the second switch tube chip according to the current flowing through the second current-sensing element.
The terminal according to claim 7 or 8, wherein the at least one level of protection circuit includes a first level of protection circuit and a second level of protection circuit;

The first switch tube chip in the first level protection circuit and the first switch tube chip in the second level protection circuit are connected in series between the first end and the second end of the battery protection package chip.
The terminal according to any one of claims 7-9, wherein the battery protection board assembly further comprises:

The first thermistor is arranged at the second end of the battery protection package chip; the first thermistor is configured to detect the temperature of the battery protection package chip.
The terminal according to any one of claims 7-10, wherein the battery protection board assembly further comprises:

The second thermistor is disposed at the first end of the battery protection package chip; the second thermistor is configured to detect the temperature of the first tab or the second tab.
The terminal according to claim 7, characterized in that,

The first switching tube chip includes: a first transistor, a second transistor, a first parasitic diode, and a second parasitic diode; the first transistor and the second transistor are connected in series;

The first parasitic diode is connected in parallel with the first transistor, the second parasitic diode is connected in parallel with the second transistor, and the unidirectional conducting directions of the first parasitic diode and the second parasitic diode are opposite.
The terminal according to claim 7, wherein the first current-sensing element comprises a resistor.
The terminal according to any one of claims 1-13, characterized in that,

The battery includes a battery body and a packaging film wrapping the battery body; the packaging film has a top seal on the top surface of the battery body, and the top seal is bent and covered with the packaging film Part of the top surface of the cell body is bonded; the first tab and the second tab are arranged on the cell body and drawn out from the top seal;

The main body part is attached to the surface of the first tab, the second tab and the top sealing part away from the cell body.
The terminal according to claim 14, characterized in that,

The first connector is arranged at an end of the first extension part away from the main body; the second connector and the battery protection package chip are arranged at an end of the second extension part away from the main body ;

The main body part includes a tab welding part, the first folding part and the second folding part; the first tab pad and the second tab pad are arranged on the tab welding part The first surface; the first folding part is arranged at one end of the lug welding part and connected to the first extension part; the second folding part is arranged at the lug welding part away from the first one end of a folded portion connected to the second extension portion;

The battery assembly further includes a protective film; the first folding part and the second folding part are bent to the second surface of the tab welding part, and the protective film is located between the first folding part and the Between the second surface, and between the second folding portion and the second surface, and the protective film covers the second surface and the packaging film.
The terminal according to claim 4, characterized in that, the terminal further includes a middle frame; the main board and the battery cells are arranged in the middle frame; the terminal also includes a chip arranged in the battery protection package and the first thermal paste between the motherboard.
The terminal according to claim 1, characterized in that, the terminal further comprises a middle frame and a rear case; the main board and the electric core are disposed in an accommodating cavity formed between the middle frame and the rear case ;

The first connector and the second connector are arranged on the same surface of the FPC, and the battery protection packaging chip and the first connector are respectively arranged on the opposite surface of the FPC; the terminal also includes The second heat-conducting glue is arranged between the battery protection package chip and the rear shell.
The terminal according to any one of claims 1-17, characterized in that the terminal further comprises a first component and a second component arranged on a surface of the main board close to the extension;

The first component is located between the main board and the battery protection package chip; the vertical projection of the second component on the main board is the same as the vertical projection of the battery protection package chip on the main board overlap;

The thickness of the first component is smaller than the thickness of the second component; wherein, the direction of the thickness is perpendicular to the board surface of the main board.
A battery protection board assembly, used for electrical connection with the cells of the battery assembly, characterized in that the battery protection board assembly includes:

The flexible circuit board FPC includes a main body, an extension extending outward from the main body, the extension includes a first extension and a second extension; the main body is bent relative to the extension, at least Part of the main body part is bonded to the surface of the electric core having a first tab and a second tab;

The tab pad is arranged on the main body, the tab pad includes at least a first tab pad and a second tab pad, and the first tab pad is configured to be connected to the first tab pad. The tab is electrically connected, and the second tab pad is configured to be electrically connected to the second tab;

a first connector, disposed on the first extension part, configured to be electrically connected to the main board, and the first connector is also electrically connected to the first tab pad through the FPC;

a second connector, disposed on the second extension, configured to be electrically connected to the main board;

The battery protection packaging chip is arranged on the second extension part; the battery protection packaging chip is electrically connected between the second tab pad and the second connector through the FPC.
The battery protection board assembly according to claim 19, wherein,

The first connector is disposed at an end of the first extension part away from the main body part;

The second connector and the battery protection package chip are disposed at an end of the second extension part away from the main body part.
The battery protection plate assembly according to claim 20, wherein,

The main body includes:

The tab welding part includes opposite first surfaces and second surfaces; the first tab pad and the second tab pad are arranged on the first surface of the tab welding part;

The first folding part is arranged at one end of the tab welding part and connected to the first extension part; the first folding part is configured to be bent to the second part of the tab welding part. surface;

The second folding part is arranged at an end of the tab welding part away from the first folding part and is connected to the second extension part; the second folding part is configured to be bent to the tab The second surface of the soldering part; the second surface is configured to be attached to the protective film.
The battery protection plate assembly according to any one of claims 19-21, characterized in that,

The battery protection package chip, the first connector and the second connector are disposed on the same surface of the FPC.
The battery protection plate assembly according to any one of claims 19-22, characterized in that,

The first tab is a positive tab, and the first tab pad is a positive tab pad;

The second tab is a negative tab, and the second tab pad is a negative tab pad.
A battery assembly, characterized by comprising a battery cell and the battery protection plate assembly according to any one of claims 19-23.
The battery pack according to claim 24, wherein:

The battery includes a battery body and a packaging film wrapping the battery body; the packaging film has a top seal on the top surface of the battery body, and the top seal is bent and covered with the packaging film Part of the top surface of the cell body is bonded; the first tab and the second tab are arranged on the cell body and drawn out from the top seal;

The main body part is attached to the surface of the first tab, the second tab and the top sealing part away from the cell body.
The battery pack according to claim 25, wherein:

The first connector is arranged at an end of the first extension part away from the main body; the second connector and the battery protection package chip are arranged at an end of the second extension part away from the main body ;

The main body part includes a tab welding part, the first folding part and the second folding part; the first tab pad and the second tab pad are arranged on the tab welding part The first surface; the first folding part is arranged at one end of the lug welding part and connected to the first extension part; the second folding part is arranged at the lug welding part away from the first one end of a folded portion connected to the second extension portion;

The battery assembly further includes a protective film; the first folding part and the second folding part are bent to the second surface of the tab welding part, and the protective film is located between the first folding part and the between the second surface, and between the second folding portion and the second surface, and the protective film covers the second surface and the packaging film;

Wherein, the first surface and the second surface are opposite to each other.