A battery and electronic device

Abstract

Embodiments of the present application disclose a battery and an electronic device. The battery comprises a battery cell and a FPC, no protection circuit is arranged on the battery cell and the FPC, a first part of the FPC is arranged on the top seal in the width direction of the battery cell, two second parts are respectively extended from two ends of the first part, and a second connecting part is arranged at the extended end of each second part; one second connecting part is connected with a positive electrode trace in the FPC, the positive electrode trace is extended from the corresponding second connecting part and the second part to a position opposite to a positive electrode tab; the other second connecting part is connected with a negative electrode trace in the FPC, the negative electrode trace is extended from the corresponding second connecting part and the second part to a position opposite to a negative electrode tab, and at least one of the positive electrode tab and the negative electrode tab is provided as at least two. In this way, the positive electrode trace and the negative electrode trace in the FPC are arranged in single polarity, 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] This application relates to the field of battery structure technology, and in particular to a battery and electronic device. Background Technology

[0002] With the technological advancements in mobile devices such as smartphones, the demands for thinner and lighter products, as well as longer battery life, are increasing. Controlling battery size and improving battery energy density have become key research and development areas in the industry, aiming to achieve higher battery capacity within a limited space. Taking lithium-ion batteries as an example, while effectively controlling the battery's internal resistance and improving charging and discharging efficiency, it is usually necessary to avoid the risk of short circuits. Summary of the Invention

[0003] This application provides a battery and electronic device that solves the problem of battery short circuits through structural optimization.

[0004] The first aspect of this application provides a battery without a protection circuit. The battery includes a cell and an FPC. The cell has a top seal at its head. The positive electrode tab and the negative electrode tab of the cell extend from the top seal, and at least one of the positive electrode tab and the negative electrode tab is provided as at least two. The FPC includes a first part and two second parts. The first part is stacked 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 extend from both ends of the first part, and the extended ends of the two second parts are respectively provided with second connection parts. One of the second connection parts is connected to the positive electrode trace in the FPC for electrical connection with the positive voltage terminal on the motherboard side. 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 for electrical connection with the negative voltage terminal on the motherboard side. 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 inner extension ends of the positive electrode trace and the inner extension ends of the negative electrode trace are spaced apart. This configuration, by increasing the number of tabs to achieve current shunting, can reduce the impact of high current density during charging and discharging. The positive and negative electrode traces inside the FPC are arranged in a unipolar manner, which can avoid problems such as short circuits caused by tweezers, short circuits caused by solder balls, 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 to implementation schemes that include positive and negative traces on both sides, the traces on both sides of this implementation scheme are unipolar, eliminating the need to maintain the spacing between non-polar traces. Full copper traces can be implemented within the same wiring width, effectively reducing the link impedance on the battery FPC side.

[0006] Furthermore, no protection circuits are installed on the battery cells and FPC. For a battery compartment of the same size, the volume space of the battery compartment can be fully utilized to arrange the battery cells, thereby increasing the battery capacity and effectively increasing the volumetric energy density of the battery.

[0007] For example, the battery cell can be a bipolar battery cell including a positive electrode and a negative electrode, or it can be a multipolar battery cell with an increased number of electrodes.

[0008] Based on the first aspect, this 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 positive electrode tab is located on the other side of the top seal. Thus, with the positive and negative electrodes located on opposite sides of the top seal, the wiring within the FPC can be reasonably controlled, ensuring that the connectors and FPC on the same side are designed with the same polarity, achieving a single-sided unipolar connection. This approach features a simple and reliable structure.

[0009] Based on the first embodiment of the first aspect, this application also provides a second embodiment of the first aspect: the positive electrode tab can be set to one, and correspondingly, the negative electrode tab can be set to two. With this configuration, by increasing the number of negative electrode tabs, the local current density of the battery negative electrode sheet is reduced under the same charging load, which can effectively improve the lithium plating phenomenon near the welding area of ​​the battery negative electrode tab.

[0010] For example, the positive electrode tab can also be set to two, and the corresponding negative electrode tab can be set to one.

[0011] Based on the first aspect, or the first implementation of the first aspect, or the second implementation of the first aspect, this application also provides a third implementation of the first aspect; the second connecting part can be a BTB (board to board) connector disposed at the extension end of the second part. In practical applications, the positive and negative connecting parts of the FPC are engaged with the motherboard-side connector through the connector to establish a reliable electrical connection of the corresponding signal interface, while also having good assembly processability.

[0012] A second aspect of this application provides an electronic device including a motherboard and a battery, the battery being the type described above. Second connecting portions located at two extension ends of a second portion of an FPC are electrically connected to a positive voltage terminal and a negative voltage terminal on the motherboard, respectively. The motherboard is equipped with a protection circuit. Based on the unipolar arrangement of the positive and negative electrode traces within the battery-side FPC, problems such as short circuits caused by tweezers, short circuits by solder balls, or short circuits due to foreign objects in the FPC can be avoided, mitigating safety risks such as battery fires caused by continuous short circuits.

[0013] In practical applications, batteries based on this protection board assembly can be used in application scenarios with requirements for thin and light design, specifically for electronic devices including rechargeable batteries such as mobile phones, tablets, and laptops.

[0014] Based on the second aspect, this application also provides a first implementation method for the second aspect: a charging chip is further provided on the motherboard, and the charging chip is connected to the positive voltage terminal. In practical applications, two charging chips are provided. This not only increases the charging power but also reduces the risk of local overheating by distributing the load, thereby improving the safety of battery use.

[0015] In practical applications, the charging chip can have a metal shield to avoid electromagnetic crosstalk between the two and also to help provide heat dissipation, ensuring the stability of the chip's performance during the charging process and enabling fast and stable charging at high charging power.

[0016] Based on the second aspect, or the first embodiment of the second aspect, this application also provides a second embodiment of the second aspect: the protection circuit is electrically connected to the negative voltage terminal and is located close to the negative voltage terminal. Based on the structural characteristic that the positive and negative voltage terminals on the motherboard side are unipolar, the protection circuit can be located close to the negative voltage terminal. In this way, the protection function is achieved according to the voltage and current of the negative voltage terminal, and the corresponding internal traces on the motherboard side are shortened, reducing link losses on the motherboard side.

[0017] Based on the second implementation of the second aspect, this application also provides a third implementation of the second aspect: the protection circuit is electrically connected between the charging chip and the positive voltage terminal, with the protection circuit positioned close to the positive voltage terminal and the charging chip positioned close to the protection circuit. In this way, the protection function is achieved based on the voltage and current of the positive voltage terminal, which also shortens the corresponding traces on the board and reduces link losses on the motherboard side. Attached Figure Description

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

[0019] Figure 2 Show Figure 1 A schematic diagram showing the stacking assembly relationship of the battery protection board assembly shown;

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

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

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

[0023] Figure 6 for Figure 5 A schematic diagram showing 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 illustrating the assembly relationship of another battery provided in an embodiment of this application;

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

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

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

[0028] Figure 11 A schematic diagram showing the lithium deposition relationship of the negative electrode plates of the battery cell with different numbers of negative electrode tabs is shown;

[0029] Figure 12 This is a schematic diagram illustrating the assembly relationship of another battery provided in an embodiment of this application. Detailed Implementation

[0030] This application provides a battery optimization solution that effectively improves battery energy density while avoiding short-circuit risks, reducing battery internal resistance, and improving charging and discharging efficiency.

[0031] Typically, batteries used in electronic devices such as mobile phones and tablets consist of battery cells and protection board assemblies. The battery cells supply power to the devices in the electronic equipment, while the battery protection board protects the battery, providing protection against overcharge, over-discharge, overcurrent, and short circuits to prevent safety and reliability issues during charging and discharging. This protection board assembly includes a circuit board and corresponding protection devices, thereby constructing a protection circuit that implements the protection functions. The protection circuit built upon these protection devices can be implemented using existing technologies, and therefore will not be elaborated upon here.

[0032] This protection board assembly includes a circuit board and corresponding protection devices, thereby constructing a protection circuit that performs the protection function. The configuration of the protection devices needs to be selected based on the control logic design of the protection circuit. For example, it may include: current-sensing resistors, transistors for controlling the disconnection of the battery charging / discharging circuit, transient suppression diodes for port surge protection, and protection chips for detecting battery overvoltage, undervoltage, and overcurrent faults, as well as conventional resistors and capacitors required for the chip's peripheral circuitry. The protection circuit constructed based on the above protection devices can be implemented using existing technology, and therefore will not be elaborated upon here.

[0033] Please see Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of a typical battery 10′ overall structure. The FPC 2′ of the battery 10′ is located at the head of the cell 1′, specifically stacked on the top seal 11′ extending from the body of the cell 1′. Figure 2 A schematic diagram of the stacking assembly relationship of the FPC2′ is shown.

[0034] Combination Figure 2 As shown, the tab 12' of cell 1' is soldered to the underside of PCB 22' via a U-shaped adapter piece 21', and is electrically connected to the load device via an FPC (flexible printed circuit) 23' located above PCB 22', forming an electrical signal loop. The protection device 24' is located below PCB 22' and in front of the tab 12'. When the cell thickness is reduced to below a certain size, the protection board assembly stacked on top of the top seal 11' will exceed the thickness of the cell body. This means that the stacked components of FPC 2' cannot accommodate the thickness of the thinner cell, resulting in a larger overall battery thickness. This requires additional space in the overall design, which is detrimental to improving the battery's volumetric energy density.

[0035] Based on this, this application provides a battery without a protection circuit. The battery may include a cell and an FPC. The cell has a top seal at its head, and the tabs of the cell extend from the top seal. At least one of the positive and negative tabs is provided as 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 cell, and the first part of the FPC is provided with a first connection part that is electrically connected to the tabs. The two second parts extend from both ends of the first part, and the extended ends of the two second parts are provided with a connection for... A second connection portion electrically connected to the motherboard; one of the second connection portions is connected to a positive electrode trace inside the FPC for electrical connection to a positive voltage terminal on the motherboard side, the positive electrode trace extending from the corresponding second connection portion and the second part to a position on the first connection portion opposite to the positive electrode tab; the other second connection portion is connected to a negative electrode trace inside the FPC for electrical connection to a negative voltage terminal on the motherboard side, the negative electrode trace extending from the corresponding second connection portion and the second part to a position on the first connection portion opposite to the negative electrode tab; the inner extension ends of the positive electrode trace and the inner extension ends of the negative electrode trace are spaced apart.

[0036] In this way, by increasing the number of tabs to achieve current shunting, the impact of high current density during charging and discharging can be reduced. The positive and negative electrode traces in the FPC are arranged in a unipolar manner, which can avoid problems such as short circuits caused by tweezers, short circuits caused by solder balls, 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 to implementation schemes that include positive and negative traces on both sides, the traces on both sides of this implementation scheme are unipolar, eliminating the need to maintain the spacing between non-polar traces. Full copper traces can be implemented within the same wiring width, effectively reducing the link impedance on the battery FPC side.

[0038] Furthermore, in practical applications, battery capacity can be effectively increased within a given size space. For battery compartments of the same size, the volume space can be fully utilized to arrange battery cells, effectively increasing the volumetric energy density of the battery. In applications of thin and light products, this technology can avoid exceeding the outline of the thin and light battery cell, making its advantages even more significant.

[0039] The battery layout scheme provided in this application can be applied in various scenarios with requirements for thinner and lighter product designs, such as, but not limited to, electronic devices with rechargeable batteries, including mobile phones, tablets, laptops, virtual reality (VR) terminal devices, and augmented reality (AR) terminal devices. Please refer to... Figure 3 The figure is a schematic diagram of the structure of a mobile phone provided in an embodiment of this application.

[0040] like Figure 3 As shown, in the system architecture of the mobile phone 100, the battery 10, motherboard 20, and electronic components 30 are built into the housing cavity of the mobile phone. The battery cell 1 of the battery 10 is disposed in the battery compartment 1001, and the FPC 2 is connected to the top of the battery cell 1, while the FPC 2 is connected to the motherboard 20. The battery 10 can supply power to the motherboard 20, and can supply power to the electronic components 30 through the motherboard 20.

[0041] The FPC 2 of the battery 10 is connected to the cell 1. The FPC 2 includes a first part 21 and two second parts 22. Along the width direction of the cell 1, the first part 21 of the FPC is used to be disposed in the stacking area above the top seal 11. The first part 21 is electrically connected to the tab 12 extending from the top seal 11 through a first connecting part. The two second parts 22 of the FPC extend from the first part 21 respectively. The second parts 22 are electrically connected to the main board through a second connecting part.

[0042] The first part 21 has a structure adapted to the top seal 11 of the cell 1, thereby reasonably controlling the size occupied in the length direction of the battery; the second part 22 has a structure adapted to the interface configuration requirements for connection with the motherboard 20. It can be understood that the base structure of the FPC 2 is not limited to the bending and folding arrangement shown in the figure.

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

[0044] like Figure 3 As shown, based on the extended configuration of the second part 22, the protection device used to construct the protection circuit 202 is located on the motherboard compartment 1002 side, that is, outside the battery compartment 1001. No protection circuit is configured on the battery cell 1 and FPC 2. Here, the protection circuit 202 may include a protection chip, a current sensing resistor, a transistor, a transient suppression diode (Zn diode), a MOS (protection board actuator switch), and conventional resistors, capacitors, and other components required for the chip's peripheral circuitry. In specific implementations, the specific components and their quantities can be selected according to the functional settings of the protection circuit; this embodiment does not impose limitations.

[0045] In this embodiment, the second connection portion on the second part 22 of FPC 2 is a first connector 23 located at its extended end. The first connector 23 is inserted and engaged with a corresponding second connector 201 on the motherboard 20, establishing an electrical connection for the corresponding signal interface via a BTB connector. In other words, two sets of compatible connectors achieve electrical connection with the positive and negative voltage terminals on the motherboard 20 side, forming an electrical signal loop. That is, FPC 2 is electrically connected to the positive voltage terminal on the motherboard 20 side via the positive connector and to the negative voltage terminal on the motherboard 20 side via the negative connector, forming an electrical signal loop.

[0046] In other possible implementations, the second connection part for electrical connection with the motherboard can also be a pad or a wire, etc., which is not limited in the embodiments of this application.

[0047] In other specific implementations, the protection circuit 202, which is moved out from the top cover 11, can also be placed on the small board (also called the sub-board, not shown in the figure) of the mobile phone. The small board can be connected to the main board 20 via a ribbon cable, and can integrate a receiver, a button charging interface, etc. Placing the protection circuit on the small board of the mobile phone also achieves the placement of the protection device away from the stacking area of ​​the top cover 11, thereby reducing the thickness at the top cover position.

[0048] To prevent short circuits in the positive and negative traces on FPC 2 after the protection circuit is removed, which could affect the safety and reliability of the battery charging and discharging process, in this embodiment, one of the two first connectors 23 of FPC 2 is connected to the positive trace within FPC 2 for electrical connection to the second connector 201 on the positive voltage side of the main board 20. The positive trace extends inward from the corresponding first connector 23 and the second part 22 to the position opposite to the positive tab of the first connection part. The other first connector 23 is connected to the negative trace within FPC 2 for electrical connection to the second connector 201 on the negative voltage side of the main board 20. The negative trace extends inward from the corresponding first connector 23 and the second part 22 to the position opposite to the negative tab of the first connection part. Both the positive and negative traces within FPC 2 are arranged unipolarly, effectively preventing short circuits and other problems.

[0049] In the aforementioned embodiment, the top seal 11 extends along the length direction of the battery cell. In a specific implementation, the top seal can also extend from the battery cell and bend along the thickness direction. Please refer to [link to relevant documentation]. Figure 4 This figure is a schematic diagram of the assembly relationship of another battery provided in an embodiment of this application. It is intended to clearly illustrate the difference between this embodiment and... Figure 3 The differences and connections between the described embodiments, and the same functional components or structures, are illustrated in the figures using the same reference numerals.

[0050] like Figure 4 As shown, the FPC 2b of the battery 10b is connected to the cell 1. The top seal 11b at the head of the cell 1 extends out and is bent, and is positioned along the thickness direction of the cell 1. The FPC 2b includes a first part 21b and a second part 22b. Here, along the width direction of the cell 1, the first part 21b of the FPC 2b is stacked on the stacking area at the end of the top seal 11, and is electrically connected to the protruding tab of the top seal 11 through a first connecting part thereon. No protection circuit is configured on the cell 1 and the FPC 2b; the protection circuit is located on the main board (not shown in the figure).

[0051] This reduces the space occupied by the protection circuit in the length direction at the top seal position, thereby reducing the space occupied by the protection device at the top seal position. While meeting the requirements of lightweight and thin design, it can also effectively increase the volumetric energy density of the battery.

[0052] Furthermore, for the configuration where the protection devices for the protection circuit are moved out from the top cover 11 and all placed on the motherboard, to further reduce the impact of high current density during charging and discharging, an implementation scheme with at least three tabs can be adopted. Please refer to [link to relevant documentation]. Figure 5 This figure illustrates a schematic diagram of the assembly relationship of another battery provided in an embodiment of this application. To clearly illustrate the difference between this embodiment and... Figure 3 and Figure 4 The differences and connections between the described embodiments, and the same functional components or structures, are illustrated in the figures using 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 FPC 2c to supply power to the motherboard 20c, and the motherboard 20c can supply power to 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 protection devices, and the charging chip 203 is used to manage and control the charging process of the battery 10. Here, to improve the charging power, two charging chips 203 can be configured to reduce the risk of local overheating through load sharing, thereby improving the safety of battery use.

[0054] In other implementations, the charging chip can be configured according to the overall product design requirements, rather than being limited to the two shown in the figure. This application's embodiments are not limited to these two.

[0055] In this embodiment, the battery cell 1 includes one positive electrode tab 12a and two negative electrode tabs 12b, which are arranged sequentially and spaced apart along the width direction of the battery cell 1. This improves the overall current carrying capacity of the battery and reduces the current density of a single electrode tab, providing a technical guarantee for meeting the needs of high charging power applications, such as, but not limited to, applications with a charging power of 66W or 100W. At the same time, by dispersing the current path through multiple tabs, the internal resistance of the battery can also be reduced, thereby improving the charging and discharging efficiency of the battery.

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

[0057] In this FPC 2c, the two first connecting parts on the first part 21c are electrically connected to each of the tabs of the battery cell 1, and the first part 21c extends along the width direction of the battery cell 1, and the two second parts 22c extend from both ends of the first part 21c.

[0058] In a specific implementation, the size of the first part 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 part 21c in the width direction of the battery cell 1 can also be the same as or smaller than the size of the battery cell 1, depending on the actual product. Similarly, the size of the second part 22c can also be determined according to actual needs, and this application embodiment does not limit it.

[0059] The two second connection parts 22c extension ends, which are respectively provided for electrical connection to the motherboard 20c, are both first connectors 23. The two first connectors 23 are respectively inserted and fastened to the corresponding second connectors 201 provided on the motherboard 20c to establish electrical connection of the corresponding interface; that is, they are respectively electrically connected to the positive voltage terminal and the negative voltage terminal on the motherboard 20c side to form a power supply circuit.

[0060] In other words, of the two first connectors 23, one is the positive terminal first connector 23 and the other is the negative terminal first connector 23, and both are connected to the positive terminal trace 24 and the negative terminal trace 25 in the FPC 2c, respectively. The positive terminal trace 24 and the negative terminal trace 25 in the FPC 2c are both arranged in a unipolar manner, which can avoid problems such as short circuits caused by tweezers, short circuits caused by solder balls, 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.

[0061] As shown in the figure, the positive electrode trace 24 extends from the first connector 23 at the positive end and the corresponding second part 22c to the position of the first part 21c opposite to the positive electrode tab 12a, for electrical connection with the positive electrode tab 12a; the negative electrode trace 25 extends from the first connector 23 at the negative end and the corresponding second part 22c to the position of the first part 21c opposite to the two negative electrode tabs 12b, for electrical connection with the negative electrode tabs 12b. Accordingly, the inner ends of the positive electrode trace 24 and the negative electrode trace 25 are arranged facing each other and spaced apart in the first part 21c of the FPC; that is, there is a certain distance P between the inner ends of the positive electrode trace 24 and the inner ends of the negative electrode trace 25.

[0062] Using FPC 2-A, where both first connectors can achieve positive and negative connections to the motherboard, as a comparison, the FPC 2c provided in this implementation scheme can reasonably control the length of intra-board links. Please refer to... Figure 6 The image is Figure 5 The diagram shows a comparison of the link lengths of the FPC shown in the figure and the FPC shown in the comparative example.

[0063] Figure 6 The figure above shows a schematic diagram of the structure of the comparative example FPC 2-A. Its negative electrode routing path L1 is shown by the dashed line in the figure, and its positive electrode routing path L2 is shown by the dotted line in the figure. Figure 6 The image below shows... Figure 5 The FPC 2c shown in the figure has its negative terminal trace path L3 as indicated by the dashed line and its positive terminal trace path L4 as indicated by the dotted line. Based on the premise that the positive terminal current-carrying cross-sections and positive terminal current-carrying cross-sections of both are approximately the same, the positive terminal current-carrying links of both are roughly identical as shown in the figure. The negative terminal current-carrying link length of the FPC 2c in this embodiment is shorter. The difference in negative terminal current-carrying link length between the two embodiments can be seen in the dimension mark P, which reduces link loss. Furthermore, compared to the spacing maintained between the positive and negative terminal traces in the comparative example, the traces on both sides of this embodiment are unipolar, eliminating the need to maintain non-unipolar spacing. With full copper cabling 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, of the two second connectors 201 on the motherboard 20c, one is inserted and fastened to the positive terminal first connector 23 on the FPC 2c, and the charging chip 203 is connected to the second connector 201 adapted to the positive terminal and can be positioned close to the second connector 201; the other is inserted and fastened to the negative terminal first connector 23 on the FPC 2c, and the protection circuit 202 is connected to the second connector 201 adapted to the negative terminal and can be positioned close to the second connector 201. In this way, the corresponding internal traces on the motherboard 20c side are shortened, further reducing the link loss on the motherboard side.

[0065] During charging, the charging chip 203 provides a safe and efficient charging process for the battery 1. Based on the current state of the battery, it controls the current flowing into the battery to ensure that the battery is charged with an appropriate current, avoiding overcharging or overheating. The specific function of the charging chip 203 can be implemented using existing technology, and this application embodiment does not limit it.

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

[0067] Furthermore, the protection circuit 202 is connected to the second connector 201 adapted to the negative terminal, and can achieve corresponding protection functions by detecting the voltage and current of the battery's negative terminal. For example, when the negative terminal voltage is higher than a preset threshold, the protection circuit 202 can send a signal to disconnect the connection between the charger (not shown in the figure) and the battery to prevent overcharging; as another example, when the negative terminal voltage is lower than the preset threshold, the protection circuit 202 can cut off the discharge path of battery 1 to prevent the battery from being over-discharged. The specific function of this protection circuit 202 can be implemented using existing technology, and this application embodiment does not limit it.

[0068] The foregoing Figure 5 In the described implementation, along the width direction of cell 1, one of the three tabs, the positive tab 12a, is located on the left side of cell 1, and the two negative tabs 12b are located on the right side of cell 1. In other specific implementations, the relative left-right positions of the positive and negative tabs can be adjusted. That is, the positive tab can be located on one side of the top seal of cell 1, and the negative tab can be located on the other side of the top seal of cell 1. This allows for reasonable control of the wiring within the FPC, ensuring that the connectors and FPC on the same side are designed with the same polarity, achieving a single-sided unipolar connection. Please refer to [link to relevant documentation]. Figure 7 This figure illustrates a schematic diagram of the assembly relationship of another battery provided in an embodiment of this application. To clearly illustrate the differences between this embodiment and... Figure 5 The differences and connections between the described embodiments, and the same functional components or structures, are illustrated in the figures using 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 arranged sequentially at intervals along the width direction of the battery cell 1. Figure 5 Compared to the described battery cell, the main difference in this embodiment is that, along the width direction of the battery cell 1, two of the three tabs, the negative tabs 12b, are located on the left side of the battery cell 1, and one positive tab 12a is located on the right side of the battery cell 1.

[0070] Other components and connections can be related to Figure 5 The battery cells described are the same. Further details will not be provided here.

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

[0072] Please see Figure 8 This figure is a schematic diagram of the assembly relationship of another battery provided in an embodiment of this application. It is intended to clearly illustrate the difference between this embodiment and... Figure 5 The differences and connections between the described embodiments, and the same functional components or structures, are illustrated in the figures using 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 connected to the positive terminal of the adapter. It can realize the corresponding protection function by detecting the voltage and current of 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 battery 1, and then be connected to the system ground after exiting from the negative terminal of cell 1. The specific implementation can be based on existing technology, which will not be elaborated here.

[0074] Other components and connections can be related to Figure 5 The battery cells described are the same. Further details will not be provided here.

[0075] Please see Figure 9 This figure is a schematic diagram of the assembly relationship of another battery provided in an embodiment of this application. To clearly illustrate the differences between this embodiment and... Figure 7 The differences and connections between the described embodiments, and the same functional components or structures, are illustrated in the figures using 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 with the positive terminal of the adapter, and can also achieve the aforementioned protection function.

[0077] Other components and connections can be related to Figure 10 The battery cells described are the same. Further details will not be provided here.

[0078] The foregoing Figure 5 and Figure 7 In the described implementation, each of the three tabs of cell 1 includes 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; please refer to [link to relevant documentation]. Figure 10 This figure is a schematic diagram of the assembly relationship of another battery provided in an embodiment of this application. It is intended to clearly illustrate the difference between this embodiment and... Figure 5 and Figure 7 The differences and connections between the described embodiments, and the same functional components or structures, are illustrated in the figures using the same reference numerals.

[0079] like Figure 10 As shown, the battery cell 1 includes two positive electrode tabs 12a and one negative electrode tab 12b, which are arranged sequentially at intervals along the width direction of the battery cell 1. Correspondingly, the positive electrode trace 24d in the FPC 2d extends from the first connector 23 at the positive end and the corresponding second part 22d to the position of the first part 21d opposite to the two positive electrode tabs 12a, so as to electrically connect with the positive electrode tabs 12a; the negative electrode trace 25d extends from the first connector 23 at the negative end and the corresponding second part 22d to the position of the first part 21d opposite to the negative electrode tab 12b, so as to electrically connect with the negative electrode tab 12b.

[0080] Other components and connections can be related to Figure 5 The battery cells described are the same. Further details will not be provided here.

[0081] Compared to Figure 10 The described implementation scheme, Figure 5 and Figure 7 The described solution, by increasing the number of negative electrode tabs, reduces the local current density of the battery's negative electrode sheet under the same charging load, effectively mitigating lithium plating near the welding area of ​​the negative electrode tabs. Please refer to [link / reference] for details. Figure 11 The figure shows a schematic diagram of lithium deposition on the negative electrode plates of a battery cell with different numbers of negative electrode tabs.

[0082] Figure 11 The upper diagram shows a schematic of a negative electrode tab and corresponding negative electrode plate in cell 1B; the lower diagram shows... Figure 5 The diagram shows a battery cell 1 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 electrons and combines with lithium ions. The lithium ions flow from the positive electrode side into the negative electrode and embed into the negative electrode material.

[0083] Under the same charging load, the scheme shown in the upper figure, which uses a single negative electrode tab to pass current, suffers from high current density, which increases electrochemical polarization. This causes the reduction reaction rate of lithium ions on the negative electrode surface to fail to match the lithium ion supply rate (as shown by the arrows in the figure), resulting in lithium plating in localized areas. The scheme shown in the lower figure, which uses two negative electrode tabs to pass current, avoids the problem of excessively high current density in localized areas of a single negative electrode tab. Thus, based on the current distribution, it avoids the increased electrochemical polarization caused by high current density, ensuring the lithium ion insertion rate and effectively improving lithium plating performance.

[0084] The foregoing Figure 5 , Figures 7 to 10 In the described implementation, the battery cell includes three tabs. In other specific implementations, the battery cell may also include four tabs; please refer to [link to relevant documentation]. Figure 12 This figure is a schematic diagram of the assembly relationship of another battery provided in an embodiment of this application. To clearly illustrate the differences between this embodiment and... Figure 5 The differences and connections between the described embodiments, and the same functional components or structures, are illustrated in the figures using the same reference numerals.

[0085] like Figure 12As shown, the battery cell 1 includes two positive electrode tabs 12a and two negative electrode tabs 12b, which are spaced apart along the width direction of the battery cell 1. Correspondingly, the positive electrode trace 24e in the FPC 2e extends from the first connector 23 at the positive end and the corresponding second part 22e to the position of the first part 21e opposite to the two positive electrode tabs 12a, so as to be electrically connected to the positive electrode tabs 12a; the negative electrode trace 25e extends from the first connector 23 at the negative end and the corresponding second part 22e to the position of the first part 21e opposite to the negative electrode tabs 12b, so as to be electrically connected to the negative electrode tabs 12b.

[0086] Other components and connections can be related to Figure 5 The battery cells described are the same. Further details will not be provided here.

[0087] This application also provides an electronic device, which includes a motherboard and a battery, the battery being the aforementioned... Figures 3 to 5 and Figures 7 to 10 , Figure 11 The battery described in [the document / article].

[0088] In addition to the aforementioned mobile terminal devices such as mobile phones, tablets, and laptops, the electronic device 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 functions of the corresponding electronic device are not the core inventive points of this application, and therefore will not be elaborated upon here.

[0090] Furthermore, the ordinal numbers "first" and "second," etc., used herein are only for describing the composition or structure of the same function in the technical solution. It is understood that the use of the aforementioned ordinal numbers does not constitute a limitation on the understanding of the technical solution for which protection is sought in this application.

[0091] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery, characterized in that, The battery does not have a protection circuit; the battery includes a cell and an FPC, the cell has a top seal at its head, and the positive and negative tabs of the cell extend from the top seal respectively, wherein there is one positive tab and two negative tabs; The FPC includes a first part and two second parts. The first part is stacked on the top seal along the width direction of the 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 extend from both ends of the first part, and the extended ends of the two second parts are respectively provided with a second connection part. One of the second connection portions is connected to the positive electrode trace inside the FPC for electrical connection with the positive voltage terminal on the motherboard side. The positive electrode trace extends inward from the corresponding second connection portion and the second portion to the position of the first connection portion opposite to the positive electrode tab. One of the second connection portions is connected to the negative electrode trace inside the FPC for electrical connection with the negative voltage terminal on the motherboard side. The negative electrode trace extends inward 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 end of the positive electrode line is spaced apart from the inner end of the negative electrode line.

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 1 or 2, characterized in that, The second connection part is a BTB connector.

4. An electronic device, characterized in that, The electronic device includes a motherboard and a battery, wherein the battery is the type described in claims 1-3; the battery is electrically connected to the positive voltage terminal and the negative voltage terminal on the motherboard respectively by means of the second connection portion, and the motherboard is provided with a protection circuit.

5. The electronic device according to claim 4, characterized in that, The motherboard is also equipped with a charging chip, which is connected to the positive voltage terminal.

6. The electronic device according to claim 5, characterized in that, The charging chip is configured as two.

7. The electronic device according to claim 6, characterized in that, The charging chip has a metal shield.

8. The electronic device according to any one of claims 5 to 7, characterized in that, The protection circuit is electrically connected to the negative voltage terminal, and the protection circuit is positioned close to the negative voltage terminal, while the charging chip is positioned close to the positive voltage terminal.

9. The electronic device according to any one of claims 5 to 7, characterized in that, The protection circuit is electrically connected between the charging chip and the positive voltage terminal, with the protection circuit positioned close to the positive voltage terminal and the charging chip positioned close to the protection circuit.

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