Battery and electronic equipment

Abstract

The embodiment of the invention discloses a battery and electronic equipment. The battery comprises a battery cell and an FPC, the battery cell and the FPC are not provided with a protection circuit, a first part of the FPC is arranged on a top seal in a stacked mode in the width direction of the battery cell, two second parts are formed by extending from the two ends of the first part respectively, and the extending ends of the second parts are provided with second connecting parts respectively; wherein one second connecting part is connected with a positive wire in the FPC, and the positive wire extends to a position opposite to the positive tab from the corresponding second connecting part and the second part; wherein the other second connecting part is connected with a negative wire in the FPC, the negative wire extends to a position opposite to the negative tab from the corresponding second connecting part and the second part, and at least one of the positive tab and the negative tab is provided with at least two. According to the arrangement, the positive wire and the negative wire in the FPC are arranged in a unipolar manner, so that the possibility of safety risks such as fire caused by continuous short circuit can be avoided, and the link impedance of the FPC can be reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of battery structures, and in particular to a battery and an electronic device. Background Art

[0002] With the technological advancement of mobile devices such as mobile phones, the demand for thinner and lighter products and longer battery life is increasing. Controlling battery volume and increasing battery energy density have become key research and development directions within the industry, aiming to achieve higher battery capacity within a given size. For example, in lithium-ion batteries, while properly controlling the battery's internal resistance and effectively improving charge and discharge efficiency, it is generally necessary to avoid short-circuit risks. Summary of the Invention

[0003] The embodiments of the present application provide a battery and an electronic device that solve the problem of battery short circuit through structural optimization.

[0004] A first aspect of an embodiment of the present application provides a battery, wherein no protection circuit is provided in the battery, the battery comprising a battery cell and an FPC, the head of the battery cell having a top seal, the positive electrode tab and the negative electrode tab of the battery cell respectively extending from the top seal, and at least one of the positive electrode tab and the negative electrode tab being provided as at least two. The FPC includes a first part and two second parts, the first part is stacked and arranged on the top seal along the width direction of the battery cell, and the first part is provided with a first connection part that is electrically connected to the positive electrode tab and the negative electrode tab respectively, the two second parts are extended from the two ends of the first part respectively, and the extended ends of the two second parts are respectively provided with a second connection part; one of the second connection parts is connected to the positive electrode trace in the FPC, and is used to be electrically connected to the positive voltage terminal on the mainboard side, and the positive electrode trace extends inward from the corresponding second connection part and the second part to the position of the first connection part opposite to the positive electrode tab; the other second connection part is connected to the negative electrode trace in the FPC, and is used to be electrically connected to the negative voltage terminal on the mainboard side, and the negative electrode trace extends inward from the corresponding second connection part and the second part to the position of the first connection part opposite to the negative electrode tab; the inward extending end of the positive electrode trace and the inward extending end of the negative electrode trace are spaced apart. With this setting, current diversion is achieved by increasing the number of tabs, which can reduce the impact of high current density during charging and discharging. The positive and negative wiring in the FPC are both arranged in a unipolar manner, which can avoid problems such as short circuits caused by tweezers, short circuits caused by tin beads, or short circuits caused by foreign objects in the FPC, and avoid the possibility of safety risks such as fire caused by continuous short circuits.

[0005] In addition, compared with the implementation scheme that includes positive and negative wiring on both sides, the wiring on both sides of this implementation scheme is unipolar, and there is no need to retain the spacing between lines of non-polarity. Full copper wiring can be achieved within the same wiring width, and the link impedance on the battery FPC side can be effectively reduced.

[0006] In addition, no protection circuit is set on the battery cells and FPC. For battery compartments of the same size, the volume space of the battery compartment can be fully utilized to arrange the battery cells, improve the battery capacity, and effectively increase the volume energy density of the battery.

[0007] Illustratively, the battery cell may be a bipolar tab battery cell including a positive electrode tab and a negative electrode tab, or a multi-tab battery cell with an increased number of tabs.

[0008] Based on the first aspect, the present application also provides a first implementation of the first aspect: in the width direction of the battery cell, the positive electrode tab is located on one side of the top seal, and the negative electrode tab is located on the other side of the top seal. This configuration, with the positive and negative electrode tabs located on either side of the top seal, allows for proper control of the wiring within the FPC, ensuring that the connector and FPC on the same side are designed with the same polarity, achieving a single-sided, single-polarity connection. This design offers a simple and reliable structure.

[0009] Based on the first embodiment of the first aspect, the present application also provides a second embodiment of the first aspect: the positive electrode tab can be provided as one, and correspondingly, the negative electrode tabs can be provided as two. This configuration reduces the local current density of the battery's negative electrode tab under the same charging load by increasing the number of negative electrode tabs, effectively alleviating lithium deposition near the welding area of ​​the battery's negative electrode tabs.

[0010] Exemplarily, the number of positive electrode tabs may be two, and the number of negative electrode tabs may be one.

[0011] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, the present application also provides a third embodiment of the first aspect; the second connecting portion can be a BTB (board-to-board) connector disposed at an extended end of the second portion. In actual applications, the positive and negative connecting portions of the FPC are plugged and engaged with the motherboard-side connector via the connector, establishing a reliable electrical connection between the corresponding signal interfaces and having good assembly processability.

[0012] A second aspect of an embodiment of the present application provides an electronic device comprising a motherboard and a battery, the battery being the aforementioned battery. Second connectors, provided at the two second extensions of an FPC, are electrically connected to the positive and negative voltage terminals on the motherboard, respectively. The motherboard is provided with a protection circuit. Due to the structural characteristics of the single-polarity arrangement of the positive and negative wiring within the FPC on the battery side, problems such as tweezer shorting, solder ball shorting, or FPC foreign matter shorting can be avoided, thereby minimizing safety risks such as battery fires caused by sustained short circuits.

[0013] In practical applications, the battery based on the protection board assembly can be used in application scenarios with lightweight design requirements, specifically electronic devices including rechargeable batteries such as mobile phones, tablet computers and laptops.

[0014] Based on the second aspect, the present application also provides a first implementation of the second aspect: a charging chip is further provided on the mainboard, connected to the positive voltage terminal. In practical applications, two charging chips are provided. This increases charging power while reducing the risk of local overheating through load sharing, thereby improving battery safety.

[0015] In practical applications, the charging chip can have a metal shielding cover to avoid the influence of electromagnetic crosstalk between the two. At the same time, it can also assist in providing heat dissipation capabilities, ensure the stability of chip performance during the charging process, and achieve fast and stable charging at high charging power.

[0016] Based on the second aspect, or the first embodiment of the second aspect, the present application also provides a second embodiment of the second aspect: the protection circuit is electrically connected to the negative voltage terminal and is disposed proximate to the negative voltage terminal. Due to the structural characteristics of the motherboard side's unipolar positive and negative voltage terminals, the protection circuit can be disposed proximate to the negative voltage terminal. In this way, the protection function is implemented based on the voltage and current at the negative voltage terminal, and the corresponding internal wiring on the motherboard side is shortened, reducing link loss on the motherboard side.

[0017] Based on the second embodiment of the second aspect, the present application also provides a third embodiment of the second aspect: the protection circuit is electrically connected between the charging chip and the positive voltage terminal, the protection circuit is located near the positive voltage terminal, and the charging chip is located near the protection circuit. In this way, the protection function is implemented based on the voltage and current of the positive voltage terminal, and the corresponding wiring within the board can also be shortened, reducing link loss on the mainboard side. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a typical schematic diagram of the overall structure of a battery;

[0019] Figure 2 Show Figure 1 Schematic diagram of the stacking assembly relationship of the protection plate assembly of the battery shown in;

[0020] Figure 3 A schematic diagram of the assembly relationship of a mobile phone provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the assembly relationship of another battery provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the assembly relationship of another battery provided in an embodiment of the present application;

[0023] Figure 6 for Figure 5 Schematic diagram of the link length comparison between the FPC shown in the figure and the FPC shown in the comparative example;

[0024] Figure 7 A schematic diagram of the assembly relationship of another battery provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of the assembly relationship of another battery provided in an embodiment of the present application;

[0026] Figure 9 A schematic diagram of the assembly relationship of another battery provided in an embodiment of the present application;

[0027] Figure 10 A schematic diagram of the assembly relationship of another battery provided in an embodiment of the present application;

[0028] Figure 11 A schematic diagram showing the relationship between lithium plating on the negative electrode sheets of cells with different numbers of negative electrode tabs is shown;

[0029] Figure 12 A schematic diagram of the assembly relationship of another battery provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The embodiments of the present application provide a battery optimization solution that can effectively improve the battery energy density while avoiding the risk of short circuits, reducing the internal resistance of the battery, and improving the charging and discharging efficiency.

[0031] Typically, batteries used in electronic devices such as mobile phones and tablets consist of a battery cell and a protection board assembly. The battery cell is used to power the components of the electronic device, while the battery protection board is used to protect the battery, providing protection against overcharge, over-discharge, overcurrent, and short circuits, for example, to prevent safety and reliability issues during the battery's charge and discharge processes. The protection board assembly includes a circuit board and corresponding protection components, which together form a protective circuit that implements these protection functions. The protection circuit constructed based on these protection components can be implemented using existing technologies and will not be further described in this article.

[0032] The protection board assembly includes a circuit board and corresponding protection devices, and thus constructs a protection circuit that realizes the protection function. Among them, the configuration of the protection device needs to be selected according to the control logic design of the protection circuit. For example, it may include: a current sensing resistor, a transistor for controlling the disconnection of the battery charge / discharge circuit, a transient suppression diode for port surge protection, and a protection chip for realizing battery overvoltage, undervoltage, overcurrent and other fault detection, as well as conventional resistors and capacitors required for the chip peripheral circuit. Here, the protection circuit constructed based on the above protection devices can be implemented using existing technology, so this article will not go into details.

[0033] See Figure 1 and Figure 2 ,in, Figure 1 Schematic diagram of the overall structure of a typical battery 10'. The FPC 2' of the battery 10' is located at the head of the battery cell 1', specifically stacked on the top seal 11' extending from the battery cell 1' body; Figure 2 A schematic diagram of the stacking assembly relationship of the FPC 2' is shown.

[0034] Combine Figure 2 As shown, the tab 12′ of the battery cell 1′ is welded to the bottom of the PCB 22′ through a U-shaped adapter 21′, and is electrically connected to the load device through the FPC (flexible printed circuit) 23′ located above the PCB (printed circuit board) 22′ to form an electrical signal loop. The protection device 24′ is arranged below the PCB 22′ and is located in front of the tab 12′. When the thickness of the battery cell is reduced to below a certain size, the protection plate assembly stacked on the top seal 11′ will exceed the thickness of the battery cell body. In other words, the various stacking structure components of the FPC 2′ cannot adapt to the thickness of the thinner battery cell, resulting in a larger overall thickness of the battery. The overall design requires additional battery space to accommodate the battery, which is not conducive to improving the battery volume energy density.

[0035] Based on this, an embodiment of the present application provides a battery, in which no protection circuit is provided, and the battery may include a battery cell and an FPC, the head of the battery cell has a top seal, and the tabs of the battery cell extend from the top seal, and at least one of the positive tabs and the negative tabs is set to at least two; the FPC includes a first part and two second parts, the first part of the FPC is stacked on the top seal along the width direction of the battery cell, and the first part of the FPC is provided with a first connecting part electrically connected to the tab; the two second parts are respectively extended from the two ends of the first part, and the extended ends of the two second parts are provided with A second connection portion electrically connected to the motherboard; one of the second connection portions is connected to the positive electrode trace in the FPC, and is used to be electrically connected to the positive voltage terminal on the motherboard side, and the positive electrode trace extends from the corresponding second connection portion and the second portion to the position of the first connection portion opposite to the positive electrode tab; another second connection portion is connected to the negative electrode trace in the FPC, and is used to be electrically connected to the negative voltage terminal on the motherboard side, and the negative electrode trace extends from the corresponding second connection portion and the second portion to the position of the first connection portion opposite to the negative electrode tab; the inner extending end of the positive electrode trace is spaced apart from the inner extending end of the negative electrode trace.

[0036] In this way, by increasing the number of tabs to achieve current diversion, the impact of high current density during charging and discharging can be reduced. The positive and negative wiring in the FPC are both arranged in a unipolar manner, which can avoid problems such as short circuits caused by tweezers, short circuits caused by tin beads, or short circuits caused by foreign objects in the FPC, and avoid the possibility of safety risks such as fire caused by continuous short circuits.

[0037] In addition, compared with the implementation scheme that includes positive and negative wiring on both sides, the wiring on both sides of this implementation scheme is unipolar, and there is no need to retain the spacing between lines of non-polarity. Full copper wiring can be achieved within the same wiring width, and the link impedance on the battery FPC side can be effectively reduced.

[0038] Furthermore, in practical applications, within a given space, battery capacity can be effectively increased. For battery compartments of the same size, the volumetric space can be fully utilized to arrange the cells, effectively increasing the battery's volumetric energy density. This technological advantage is even more significant in thinner and lighter product applications, as it avoids exceeding the outer contours of the thin cell.

[0039] The battery layout solution provided in the embodiments of the present application can be applied in different scenarios with requirements for lightweight and thin product design, such as but not limited to mobile phones, tablet computers, laptop computers, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices and other electronic devices with rechargeable batteries. Figure 3 , which is a structural diagram of a mobile phone provided in an embodiment of the present application.

[0040] like Figure 3 As shown in the figure, in the system architecture of mobile phone 100, the battery 10, motherboard 20, and electronic components 30 are built into the phone's housing. The battery cell 1 of battery 10 is placed in battery compartment 1001, and an FPC 2 is connected to the top of the cell 1. This FPC 2 is also connected to motherboard 20. The battery 10 can supply power to motherboard 20, which in turn can supply power to electronic components 30.

[0041] The FPC 2 of the battery 10 is connected to the battery cell 1. The FPC 2 includes a first portion 21 and two second portions 22. Along the width direction of the battery cell 1, the first portion 21 of the FPC is used to be set in the stacking area above the top seal 11. The first portion 21 is electrically connected to the tab 12 extending from the top seal 11 through a first connecting portion; the two second portions 22 of the FPC are respectively extended from the first portion 21, and the second portions 22 are electrically connected to the mainboard through a second connecting portion.

[0042] The first portion 21's structure is adapted to fit the top seal 11 of the battery cell 1, thereby effectively controlling the battery's lengthwise dimensions. The second portion 22's structure primarily accommodates the interface configuration required for connection to the motherboard 20. It should be understood that the FPC 2's base structure is not limited to the curved and folded configuration shown in the figure.

[0043] In a specific implementation, the tabs 12 (one positive tab and two negative tabs) extending from the top seal 11 are electrically connected to the first connection portion of the first portion 21 of the FPC 2. The positive tab is connected to the positive electrode interface of the first connection portion on the first portion 21 of the FPC 2, and the two negative tabs are connected to the negative electrode interfaces of the first connection portion on the first portion 21 of the FPC 2. For example, but not limited to, the first connection portion can be a tab pad provided on the first portion 21 of the FPC 2, which is not limited in this embodiment of the present application.

[0044] like Figure 3 As shown, based on the extended setting of the second part 22, the protection device for constructing the protection circuit 202 is located on the side of the mainboard compartment 1002, that is, outside the battery compartment 1001. No protection circuit is configured on the battery cell 1 and the FPC 2. Here, the protection circuit 202 may include a protection chip, a current sensing resistor, a transistor, a transient suppression diode (Zenergizer), a MOS (protection board execution switch), and conventional resistors and capacitors required for the chip peripheral circuit. In a specific implementation, the specific devices and the number of configurations can be selected according to the functional settings of the protection circuit, and the embodiment of the present application is not limited thereto.

[0045] In this embodiment, the second connection portion on the second portion 22 of the FPC 2 is a first connector 23 provided at its extended end. The first connector 23 engages with the corresponding second connector 201 on the motherboard 20 through a plug-and-snap connection. This establishes an electrical connection to the corresponding signal interface via a BTB connector. In other words, the two matching connectors electrically connect to the positive and negative voltage terminals on the motherboard 20, forming an electrical signal loop. In other words, the FPC 2 is electrically connected to the positive voltage terminal on the motherboard 20 via the positive connector, and to the negative voltage terminal on the motherboard 20 via the negative connector, forming an electrical signal loop.

[0046] In other possible implementation schemes, the second connection portion for electrically connecting to the mainboard may also be a structure such as a soldering pad or a wire, which is not limited in the embodiment of the present application.

[0047] In other specific implementations, the protection circuit 202 removed from the top seal 11 can be placed on a small board (also called a sub-board, not shown) of the mobile phone. The small board can be connected to the main board 20 via a flexible cable and can be integrated with a receiver, a button charging port, etc. Placing the protection circuit on the small board of the mobile phone also allows the protection device to be placed away from the stacking area of ​​the top seal 11, thereby reducing the thickness of the top seal.

[0048] To prevent short circuits between the positive and negative traces on the FPC 2 after the protection circuit is removed, which could affect the safety and reliability of the battery during charging and discharging, in this embodiment, one of the two first connectors 23 on the FPC 2 is connected to the positive trace within the FPC 2 and is used to electrically connect to the second connector 201 on the positive voltage terminal on the motherboard 20. The positive trace extends inward from the corresponding first connector 23 and the second portion 22 to a position on the first connection portion opposite the positive electrode tab. The other first connector 23 is connected to the negative trace within the FPC 2 and is used to electrically connect to the second connector 201 on the negative voltage terminal on the motherboard 20. The negative trace extends inward from the corresponding first connector 23 and the second portion 22 to a position on the first connection portion opposite the negative electrode tab. Both the positive and negative traces within the FPC 2 are arranged in a unipolar manner, effectively preventing problems such as short circuits.

[0049] In the above embodiment, the top seal 11 is formed extending along the length direction of the battery cell. In a specific implementation, the top seal can also extend from the battery cell and be bent along the thickness direction. Figure 4 , which is a schematic diagram of the assembly relationship of another battery provided in the embodiment of the present application. Figure 3 The differences and connections between the described embodiments, and the components or structures with the same functions are indicated in the figures with the same reference numerals.

[0050] like Figure 4 As shown, the FPC 2b of the battery 10b is connected to the battery cell 1. The top seal 11b at the head of the battery cell 1 extends and then bends, and is arranged along the thickness direction of the battery cell 1. The FPC 2b of the FPC 2b includes a first portion 21b and a second portion 22b. Here, along the width direction of the battery cell 1, the first portion 21b of the FPC 2b overlaps the stacking area at the end of the top seal 11 and is electrically connected to the tab extending from the top seal 11 through the first connection portion thereon. The battery cell 1 and the FPC 2b are not equipped with a protection circuit, which is provided on the mainboard (not shown in the figure).

[0051] In this way, the space occupied by the protection circuit in the length direction at the top sealing position can be reduced, and the space occupied by the protection device at the top sealing position can be reduced. On the basis of meeting the requirements of lightweight design, the volume energy density of the battery can also be effectively increased.

[0052] In addition, for the configuration method of removing the protection components of the protection circuit from the top seal 11 and setting them all on the main board, in order to further reduce the impact of high current density during charging and discharging, a solution of setting at least three tabs can be adopted. Figure 5 , which shows a schematic diagram of the assembly relationship of another battery provided in the embodiment of the present application. Figure 3 and Figure 4 The differences and connections between the described embodiments, and the components or structures with the same functions are indicated in the figures with the same reference numerals.

[0053] like Figure 5 As shown, the battery cell 1 of the battery 10 includes three tabs and is electrically connected to the motherboard 20c via an FPC 2c, providing power to the motherboard 20c and, through the motherboard 20c, to the electronic components. The motherboard 20c is equipped with a protection circuit 202 and a charging chip 203. The protection circuit 202 is constructed from various protective components, and the charging chip 203 is used to manage and control the charging process of the battery 10. To increase charging power, two charging chips 203 can be configured to reduce the risk of local overheating by sharing the load, thereby improving battery safety.

[0054] In other implementations, the number of charging chips can be configured according to the overall product design requirements, rather than being limited to the two shown in the figure. This embodiment of the present application is not limited thereto.

[0055] In this embodiment, the battery cell 1 includes one positive electrode tab 12a and two negative electrode tabs 12b, which are spaced apart along the width of the battery cell 1. This improves the overall current carrying capacity of the battery and reduces the current density of a single tab, providing a technical guarantee for meeting high charging power requirements, such as, but not limited to, charging power scenarios of 66W or 100W. Furthermore, by dispersing the current path through multiple tabs, the internal resistance of the battery can be reduced, thereby improving the battery's charge and discharge efficiency.

[0056] In other specific implementations, in order to improve the charge and discharge performance, more than three tabs can be used according to the actual overall design requirements of the product, rather than being limited to the three shown in the figure.

[0057] The two first connection portions on the first portion 21c of the FPC 2c are electrically connected to the tabs of the battery cell 1 respectively. The first portion 21c extends along the width direction of the battery cell 1 , and the two second portions 22c extend from both ends of the first portion 21c respectively.

[0058] In a specific implementation, the size of the first portion 21c in the width direction of the battery cell 1 can be larger than the size of the battery cell 1 as shown in the figure; of course, in other possible implementations, the size of the first portion 21c in the width direction of the battery cell 1 can also be consistent with the size of the battery cell 1, or smaller than the size of the battery cell 1, and the specific size can be determined based on the actual product. Similarly, the size of the second portion 22c can also be determined based on actual needs and is not limited in this embodiment of the application.

[0059] The second connection portions provided at the two extended ends of the second portions 22c for electrical connection to the mainboard 20c are both first connectors 23. The two first connectors 23 engage with the corresponding second connectors 201 provided on the mainboard 20c, establishing electrical connections between the corresponding interfaces; that is, they are electrically connected to the positive and negative voltage terminals on the mainboard 20c, forming a power supply circuit.

[0060] In other words, one of the two first connectors 23 is a positive-terminal first connector 23, and the other is a negative-terminal first connector 23, and both are connected to the positive and negative traces 24 and 25 within the FPC 2c, respectively. Both the positive and negative traces 24 and 25 within the FPC 2c are arranged in a unipolar configuration, which prevents problems such as shorted tweezers, solder balls, or FPC foreign matter from causing short circuits, and mitigates the possibility of fires caused by sustained short circuits.

[0061] As shown in the figure, the positive electrode trace 24 extends from the positive terminal first connector 23 and the corresponding second portion 22c to the position of the first portion 21c opposite the positive electrode tab 12a, thereby electrically connecting to the positive electrode tab 12a. The negative electrode trace 25 extends from the negative terminal first connector 23 and the corresponding second portion 22c to the position of the first portion 21c opposite the two negative electrode tabs 12b, thereby electrically connecting to the negative electrode tabs 12b. Accordingly, the inner extending ends of the positive electrode trace 24 and the negative electrode trace 25 are arranged facing each other and spaced apart on the first portion 21c of the FPC; that is, there is a certain distance P between the inner extending ends of the positive electrode trace 24 and the inner extending ends of the negative electrode trace 25.

[0062] Taking FPC 2-A, in which both first connectors can achieve positive and negative connection with the mainboard side, as a comparative example, the FPC 2c provided in this embodiment can reasonably control the length of the intra-board link. Figure 6 , the figure is Figure 5 Schematic diagram comparing the link lengths of the FPC shown in the figure and the FPC shown in the comparative example.

[0063] Figure 6 The upper figure shows the structure of the comparative example FPC 2-A, wherein the negative electrode wiring path L1 is indicated by the dotted line in the figure, and the positive electrode wiring path L2 is indicated by the dotted line in the figure; Figure 6 The following figure shows Figure 5 In the FPC 2c shown in FIG, its negative electrode routing path L3 is indicated by the dashed line, and its positive electrode routing path L4 is indicated by the dotted line. Based on the roughly identical positive and negative electrode current cross-sections for both, the figure shows that the positive electrode current links are roughly the same. The negative electrode current link of the FPC 2c in this embodiment is shorter. The difference in the negative electrode current link length between the two embodiments can be seen in the dimension mark P, which reduces link losses. Furthermore, compared to the spacing between the positive and negative electrode traces in the comparative example, the traces on both sides of this embodiment are unipolar, eliminating the need for spacing between traces of different polarities. By fully copper-clad traces within the same wiring width, the link impedance on the battery FPC side can be reduced by approximately 10%.

[0064] For example Figure 5 As shown, one of the two second connectors 201 on the motherboard 20c is plugged into and fastened to the positive-side first connector 23 on the FPC 2c. The charging chip 203 is connected to the second connector 201 adapted for the positive side and can be positioned close to it. The other second connector is plugged into and fastened to the negative-side first connector 23 on the FPC 2c. The protection circuit 202 is connected to the second connector 201 adapted for the negative side and can be positioned close to it. This shortens the corresponding internal wiring on the motherboard 20c side, further reducing link loss on the motherboard side.

[0065] During the charging process, the charging chip 203 provides a safe and efficient charging process for the battery 1. The current flowing into the battery is controlled according to the current state of the battery to ensure that the battery is charged with an appropriate current and avoid overcharging or overheating. The specific functions of the charging chip 203 can be implemented using existing technologies and are not limited in this embodiment of the application.

[0066] Furthermore, the two charging chips 203 arranged near the second connector 201 of the adapter positive end can be respectively provided with a metal shielding cover (not shown in the figure) to avoid the influence of electromagnetic crosstalk between the two. At the same time, it can also achieve rapid heat dissipation of the charging chip 203, assist in providing heat dissipation capabilities, ensure the stability of chip performance during the charging process, and achieve fast and stable charging at high charging power.

[0067] In addition, the protection circuit 202 is connected to the second connector 201 adapted to the negative terminal, and can implement corresponding protection functions by detecting the voltage and current of the negative terminal of the battery. For example, when the negative terminal voltage is higher than a preset threshold, the protection circuit 202 can send a signal to disconnect the charger (not shown) from the battery to prevent overcharging. For another example, when the negative terminal voltage is lower than a preset threshold, the protection circuit 202 can disconnect the discharge path of the battery 1 to prevent excessive discharge of the battery. The specific functions of the protection circuit 202 can be implemented using existing technologies and are not limited in the embodiments of this application.

[0068] The foregoing Figure 5 In the described embodiment, along the width direction of the battery cell 1, one of the three positive tabs 12a is located on the left side of the battery cell 1, and the two negative tabs 12b are located on the right side of the battery cell. In other specific implementations, the left-right relative position of the positive and negative tabs can be adjusted. In other words, the positive tab is located on one side of the top seal of the battery cell 1 and the negative tab is located on the other side of the top seal of the battery cell. Both can reasonably control the routing of the FPC and ensure that the connector and FPC on the same side are designed with the same polarity, realizing a single-sided single-polarity connection. See Figure 7 , which shows a schematic diagram of the assembly relationship of another battery provided in the embodiment of the present application. Figure 5 The differences and connections between the described embodiments, and the components or structures with the same functions are indicated in the figures with the same reference numerals.

[0069] like Figure 7 As shown, the battery cell 1 includes two negative electrode tabs 12b and one positive electrode tab 12a, which are sequentially arranged at intervals along the width direction of the battery cell 1. Figure 5 Compared with the battery cell described above, the main difference of this embodiment is that along the width direction of the battery cell 1, two negative electrode tabs 12b of the three tabs are located on the left side of the battery cell 1, and one positive electrode tab 12a is located on the right side of the battery cell 1.

[0070] Other structures and connections can be Figure 5 The cells described are identical and will not be described again here.

[0071] The foregoing Figure 5 and Figure 6 In the described embodiment, the protection circuit 202 is connected to the second connector 201 adapted to the negative terminal and implements corresponding protection functions based on the signal on the negative terminal side of the battery. In other specific implementations, the protection circuit 202 can also be connected to the second connector 201 adapted to the positive terminal.

[0072] See Figure 8 , which is a schematic diagram of the assembly relationship of another battery provided in the embodiment of the present application. Figure 5 The differences and connections between the described embodiments, and the components or structures with the same functions are indicated in the figures with the same reference numerals.

[0073] like Figure 8As shown, the protection circuit 202 is connected between the charging chip 203 and the second connector 201 adapted for the positive terminal. It can implement corresponding protection functions by detecting the voltage and current at the positive terminal of the battery. The charging current output by the charging chip 203 can first pass through the protection circuit 202, then flow into the positive terminal of the battery 1, and then exit from the negative terminal of the battery cell 1 to connect to the system ground. The specific implementation can be based on existing technologies and will not be detailed here.

[0074] Other structures and connections can be Figure 5 The cells described are identical and will not be described again here.

[0075] See Figure 9 , which is a schematic diagram of the assembly relationship of another battery provided in the embodiment of the present application. Figure 7 The differences and connections between the described embodiments, and the components or structures with the same functions are indicated in the figures with the same reference numerals.

[0076] like Figure 9 As shown, the protection circuit 202 is connected between the charging chip 203 and the second connector 201 adapted to the positive terminal, and can also achieve the aforementioned protection function.

[0077] Other structures and connections can be Figure 10 The cells described are identical and will not be described again here.

[0078] The foregoing Figure 5 and Figure 7 In the embodiment described, the three tabs of the battery cell 1 each include one positive tab 12a and two negative tabs 12b. In other specific implementations, the three tabs can also be configured as two positive tabs and one negative tab, see Figure 10 , which is a schematic diagram of the assembly relationship of another battery provided in the embodiment of the present application. Figure 5 and Figure 7 The differences and connections between the described embodiments, and the components or structures with the same functions are indicated in the figures with the same reference numerals.

[0079] like Figure 10 As shown, the battery cell 1 includes two positive tabs 12a and one negative tab 12b, which are spaced apart along the width of the battery cell 1. Accordingly, the positive trace 24d within the FPC 2d extends from the positive terminal first connector 23 and the corresponding second portion 22d to a position on the first portion 21d opposite the two positive tabs 12a, thereby electrically connecting to the positive tabs 12a. The negative trace 25d extends from the negative terminal first connector 23 and the corresponding second portion 22d to a position on the first portion 21d opposite the negative tab 12b, thereby electrically connecting to the negative tab 12b.

[0080] Other structures and connections can be Figure 5 The cells described are identical and will not be described again here.

[0081] Compared to Figure 10 The described embodiments, Figure 5 and Figure 7 The described solution reduces the local current density of the battery's negative electrode tabs by increasing the number of negative electrode tabs under the same charging load, which can effectively improve the lithium plating phenomenon near the battery's negative electrode tab welding area. Figure 11 , this figure shows a schematic diagram of the lithium plating relationship of the negative electrode sheets of battery cells with different numbers of negative electrode tabs.

[0082] Figure 11 The upper figure shows a negative electrode tab for cell 1B and the corresponding negative electrode tab; the lower figure shows Figure 5 The battery cell 1 shown in the figure is equipped with two negative electrode tabs and corresponding negative electrode plates. During charging, electrons from the external power source flow through the circuit to the negative electrode of the battery. The negative electrode captures the electrons and combines them with lithium ions. The lithium ions flow from the positive electrode plate to the negative electrode plate and are embedded in the negative electrode material.

[0083] Under the same charging load, the solution shown in the figure above uses a single negative electrode tab to pass current. The high current density increases electrochemical polarization, causing the reduction reaction rate of lithium ions on the negative electrode surface to be unable to match the supply rate of lithium ions (as shown by the arrows in the figure), resulting in lithium deposition in localized areas. The solution shown in the figure below passes current through two negative electrode tabs, avoiding the problem of excessive current density in localized areas of a single negative electrode tab. In this way, based on the current distribution, it is possible to avoid high current density and increase electrochemical polarization, ensuring the lithium ion insertion rate and effectively improving lithium deposition performance.

[0084] The foregoing Figure 5 、 Figures 7 to 10 In the described embodiment, the battery cells include three tabs. In other specific implementations, the battery cells may also include four tabs, see Figure 12 , which is a schematic diagram of the assembly relationship of another battery provided in the embodiment of the present application. Figure 5 The differences and connections between the described embodiments, and the components or structures with the same functions are indicated in the figures with the same reference numerals.

[0085] like Figure 12As shown, the battery cell 1 includes two positive tabs 12a and two negative tabs 12b, which are spaced apart along the width of the battery cell 1. Accordingly, the positive trace 24e within the FPC 2e extends from the positive terminal first connector 23 and the corresponding second portion 22e to a position on the first portion 21e opposite the two positive tabs 12a, thereby electrically connecting to the positive tabs 12a. The negative trace 25e extends from the negative terminal first connector 23 and the corresponding second portion 22e to a position on the first portion 21e opposite the negative tab 12b, thereby electrically connecting to the negative tab 12b.

[0086] Other structures and connections can be Figure 5 The cells described are identical and will not be described again here.

[0087] The embodiment of the present application also provides an electronic device, which includes a mainboard and a battery. The battery can be the aforementioned Figures 3 to 5 and Figures 7 to 10 、 Figure 11 The battery described in.

[0088] In addition to the aforementioned mobile phones, tablet computers, laptop computers and other mobile terminal devices, the electronic equipment may also include personal digital assistants (PDAs), wearable devices, smart TVs, virtual reality (VR) devices, augmented reality (AR) devices and other electronic devices that include rechargeable batteries.

[0089] It should be understood that other functional components of the corresponding electronic device are not the core invention of this application, so they will not be described in detail herein.

[0090] In addition, the ordinal numbers "first" and "second" used herein are only used to describe components or structures with the same function in the technical solution. It is understood that the use of the above ordinal numbers does not constitute an understanding of the technical solution claimed in this application.

[0091] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A battery, characterized in that: No protection circuit is provided in the battery; the battery comprises a battery cell and an FPC, the battery cell head has a top seal, the positive electrode tab and the negative electrode tab of the battery cell extend from the top seal respectively, wherein at least one of the positive electrode tab and the negative electrode tab is provided in at least two pieces; The FPC includes a first portion and two second portions, wherein the first portion is stacked on the top seal along the width direction of the battery cell, and the first portion is provided with a first connection portion electrically connected to the positive electrode tab and the negative electrode tab respectively, and the two second portions are respectively extended from both ends of the first portion, and the extended ends of the two second portions are respectively provided with a second connection portion; One of the second connecting portions is connected to the positive electrode trace in the FPC and is used to electrically connect to the positive voltage terminal on the motherboard side. The positive electrode trace extends inward from the corresponding second connecting portion and the second portion to a position of the first connecting portion opposite to the positive electrode tab. Another of the second connecting portions is connected to a negative electrode trace in the FPC for electrical connection to a negative voltage terminal on the motherboard side, and the negative electrode trace extends inward from the corresponding second connecting portion and the second portion to a position of the first connecting portion opposite to the negative electrode tab; The inner extending end of the positive electrode wiring is spaced apart from the inner extending end of the negative electrode wiring.

2. The battery according to claim 1, characterized in that In the width direction of the battery cell, the positive electrode tab is located on one side of the top seal, and the positive electrode tab is located on the other side of the top seal.

3. The battery according to claim 2, characterized in that The positive electrode tab is provided as one, and the negative electrode tab is provided as two.

4. The battery according to claim 2, characterized in that The positive electrode tabs are provided in two pieces, and the negative electrode tab is provided in one piece.

5. The battery according to claims 1 to 4, characterized in that The second connecting portion is a BTB connector.

6. An electronic device, characterized in that: The electronic device includes a mainboard and a battery, wherein the battery is the battery described in claims 1-5; the battery is electrically connected to the positive voltage terminal and the negative voltage terminal on the mainboard by setting the second connecting part, and a protection circuit is set on the mainboard.

7. The electronic device according to claim 6, wherein: A charging chip is also provided on the mainboard, and the charging chip is connected to the positive voltage terminal.

8. The electronic device according to claim 7, wherein: There are two charging chips.

9. The electronic device according to claim 8, wherein: The charging chip has a metal shielding cover.

10. The electronic device according to any one of claims 7 to 9, characterized in that: The protection circuit is electrically connected to the negative voltage terminal. The protection circuit is arranged close to the negative voltage terminal, and the charging chip is arranged close to the positive voltage terminal.

11. The electronic device according to any one of claims 7 to 9, characterized in that: The protection circuit is electrically connected between the charging chip and the positive voltage terminal. The protection circuit is arranged close to the positive voltage terminal, and the charging chip is arranged close to the protection circuit.

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