A circuit structure connected to a battery

Abstract

The present disclosure relates to a circuit structure connected with a battery, comprising: a circuit board comprising a plurality of circuit layers arranged in layers and a metal layer arranged on a first surface of the plurality of circuit layers; wherein a second surface of the plurality of circuit layers has a first connection terminal, a second connection terminal and a third connection terminal; the second surface is the opposite surface of the first surface; the first connection terminal is connected with a first connector; the metal layer is electrically connected with the first connection terminal and a positive electrode of the battery respectively, forming a first circuit connecting the first connection terminal with the positive electrode of the battery; the second connection terminal is connected with the positive electrode of the battery and a second connector respectively, forming a second circuit connecting the second connection terminal with the positive electrode of the battery; the third connection terminal is arranged on the second surface and electrically isolated from the first connection terminal and the second connection terminal, and is used for connecting with a negative electrode of the battery.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of electronic technology, and in particular to a circuit structure connected with a battery. BACKGROUND

[0002] Batteries are increasingly widely used in electronic products. Most electronic products that consume power have batteries, which can provide the power required for normal operation of these electronic products. Most batteries are currently rechargeable batteries, such as lithium-ion batteries, which can be used in terminals such as mobile phones and computers.

[0003] When charging a battery, the battery needs to be charged through a circuit structure connected with the battery, and when discharging the battery, the battery also needs to be discharged through a circuit structure connected with the battery. In the process of charging and discharging the battery, the current flows into or out of the battery through the circuit structure connected with the battery, and the connection and arrangement of the circuit structure will affect the amount of heat generated by the circuit structure when the current passes through the circuit structure. SUMMARY

[0004] The present disclosure provides a circuit structure connected with a battery.

[0005] In a first aspect of the embodiments of the present disclosure, a circuit structure connected with a battery is provided, comprising: a circuit board comprising a plurality of circuit layers stacked and disposed and a metal layer disposed on a first surface of the plurality of circuit layers; wherein a second surface of the plurality of circuit layers has a first connection terminal, a second connection terminal, and a third connection terminal; the second surface is the opposite surface of the first surface; the first connection terminal is connected with a first connector; the metal layer is electrically connected with the first connection terminal and a positive electrode of the battery respectively, forming a first circuit connecting the first connection terminal with the positive electrode of the battery; the second connection terminal is connected with the positive electrode of the battery and a second connector respectively, forming a second circuit connecting the second connection terminal with the positive electrode of the battery; the third connection terminal is electrically isolated from the first connection terminal and the second connection terminal and disposed on the second surface, and is used for connecting with a negative electrode of the battery.

[0006] In an embodiment, the first connection terminal and the second connection terminal are symmetrically located on both sides of the third connection terminal.

[0007] In an embodiment, the length of the first circuit is greater than the length of the second circuit; and the difference between the impedance of the first circuit and the impedance of the second circuit is within a first preset range.

[0008] In an embodiment, the metal layer is a copper-nickel plated metal layer.

[0009] In one embodiment, the circuit structure further includes: a third line electrically connected to the third connection terminal and the first connection terminal respectively, the third line and the first line forming a loop; a fourth line electrically connected to the third connection terminal and the second connection terminal respectively, the fourth line and the second line forming a loop; wherein the third line and the fourth line are connected in parallel to the negative terminal of the battery.

[0010] In one embodiment, the impedance difference between the third line and the fourth line is within a second preset range.

[0011] In one embodiment, the circuit structure further includes: a first protection module, wherein the third line and the fourth line are respectively connected to the negative terminal of the battery through their respective first protection modules, for disconnecting the third line and the fourth line when a charging or discharging abnormality occurs during battery charging or discharging; and a second protection module, wherein the third line and the fourth line are respectively connected to their respective second protection modules, the second protection modules being connected in series with the first protection module, for disconnecting the third line and the fourth line when the first protection module fails.

[0012] In one embodiment, the circuit structure further includes: a first protection controller connected to the first protection module, configured to control the state switching of the first protection module to disconnect the third line and the fourth line when a charging or discharging abnormality is detected during battery charging or discharging; and a second protection controller connected to the second protection module, configured to control the state switching of the second protection module to disconnect the third line and the fourth line when a charging or discharging abnormality is detected during battery charging or discharging and the first protection module fails.

[0013] In one embodiment, the circuit structure further includes: a current sampling module, the two ends of which are respectively connected to the negative terminal of the battery and the first protection module, for collecting the current flowing through the battery during charging or discharging; a first protection controller connected to the current sampling module, for controlling the first protection module to disconnect the third line and the fourth line according to the current collected by the current sampling module; and a second protection controller connected to the current sampling module, for controlling the second protection module to disconnect the third line and the fourth line when the first protection module fails, according to the current collected by the current sampling module.

[0014] In one embodiment, the first protection module includes: a first MOSFET and a second MOSFET; wherein the gate of the first MOSFET and the gate of the second MOSFET are respectively connected to the first protection controller, the source of the first MOSFET is connected to the negative terminal of the battery, the drain of the first MOSFET is connected to the drain of the second MOSFET, and the source of the second MOSFET is connected to the second protection module; the second protection module includes: a third MOSFET and a fourth MOSFET; wherein the gate of the third MOSFET and the gate of the fourth MOSFET are respectively connected to the second protection controller, the source of the third MOSFET is connected to the source of the second MOSFET, the drain of the third MOSFET is connected to the drain of the fourth MOSFET, and the source of the fourth MOSFET is connected to the first connector and the second connector.

[0015] In one embodiment, the circuit structure further includes: a first flexible circuit board, with its two ends connected to a first connector and a first connection terminal, respectively; wherein the first flexible circuit board includes a first positive flexible line and a first negative flexible line; the first positive flexible line is connected to the metal layer through the first connection terminal; the first negative flexible line is connected to the third line through the first connection terminal; a second flexible circuit board, with its two ends connected to a second connector and a second connection terminal, respectively; wherein the second flexible circuit board includes a second positive flexible line and a second negative flexible line; the second positive flexible line is connected to the positive terminal of the battery through the second connection terminal; the second negative flexible line... The flexible circuit is connected to the fourth circuit via the second connection terminal; the difference between the impedance value of the first positive flexible circuit and the first sum value is less than or equal to the first threshold; the first sum value is: the sum of the impedance value of the second positive flexible circuit and the impedance value of the metal layer; the sum of the impedance value of the first positive flexible circuit and the impedance value of the first circuit is less than or equal to the second threshold; the sum of the impedance value of the second positive flexible circuit and the impedance value of the second circuit is less than or equal to the second threshold; the sum of the impedance value of the first negative flexible circuit and the impedance value of the third circuit is less than or equal to the third threshold; the sum of the impedance value of the second negative flexible circuit and the impedance value of the fourth circuit is less than or equal to the third threshold.

[0016] A second aspect of this disclosure provides an electronic device, comprising: the circuit structure described in any of the above embodiments; and a battery connected to the circuit structure.

[0017] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0018] The circuit structure in this embodiment includes: a circuit board, comprising multiple stacked circuit layers and a metal layer disposed on a first surface of the multiple circuit layers; wherein, a second surface of the multiple circuit layers has a first connection terminal, a second connection terminal, and a third connection terminal; the second surface is the opposite side of the first surface; the first connection terminal is connected to a first connector; the metal layer is electrically connected to the first connection terminal and the positive electrode of the battery respectively, forming a first line connecting the first connection terminal to the positive electrode of the battery; the second connection terminal is connected to the positive electrode of the battery and the second connector respectively, forming a second line connecting the second connection terminal to the positive electrode of the battery; the third connection terminal is electrically isolated from the first connection terminal and the second connection terminal and disposed on the second surface for connection to the negative electrode of the battery.

[0019] A first circuit is formed by connecting a first connection terminal and the positive terminal of the battery through a metal layer, and a second circuit is formed by connecting the first connection terminal and the positive terminal of the battery through a second connection terminal. After the first and second connection terminals are respectively connected to the connector, current can be transmitted through the first and second circuits respectively. That is, the current passing through the first connection terminal is transmitted between the positive terminal of the battery and the first connection terminal through the first circuit, and the current passing through the second connection terminal is transmitted between the positive terminal of the battery and the second connection terminal through the second circuit. In this way, the current entering or leaving the positive terminal of the battery can be split through two circuits. Since the heat generation of the circuit is more affected by the current, the heat generation of the first and second circuits is less than the total heat generation of the circuit before the current is split, thereby reducing the problem of excessive heat generation caused by excessive current, reducing the heat generation of the circuit, and slowing down the temperature rise rate of the circuit due to heat generation.

[0020] Furthermore, since the second connection terminal is directly connected to the positive terminal of the battery, and the distance between the first connection terminal and the positive terminal of the battery is greater than the distance between the second connection terminal and the positive terminal of the battery, the impedance of the first circuit can be reduced by using a large metal layer. This reduces the difference between the impedance of the second circuit and the impedance of the first circuit, making the impedances of the first and second circuits tend to be equal. The smaller the difference between the impedances of the first and second circuits, the more equal the current flowing through the first and second circuits will be, which facilitates charging at maximum power.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0023] Figure 1This is a schematic diagram illustrating a circuit structure connected to a battery according to an exemplary embodiment;

[0024] Figure 2 This is a schematic diagram of a circuit board structure according to an exemplary embodiment;

[0025] Figure 3 This is a schematic diagram of another circuit board structure according to an exemplary embodiment;

[0026] Figure 4 This is a schematic diagram illustrating another circuit structure according to an exemplary embodiment;

[0027] Figure 5 This is a diagram illustrating the relationship between the impedance difference between a third line and a first negative flexible line and a fourth line and a second negative flexible line, according to an exemplary embodiment, and the current difference between the third line and the fourth line.

[0028] Figure 6 This is a schematic diagram of a terminal device according to an exemplary embodiment. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.

[0030] refer to Figure 1 This is a schematic diagram of a circuit structure connected to a battery according to an embodiment of this disclosure. The circuit structure includes:

[0031] The circuit board 1 includes multiple stacked circuit layers and a metal layer 101 disposed on the first surface of the multiple circuit layers. The second surface of the multiple circuit layers has a first connection terminal 102, a second connection terminal 103 and a third connection terminal 104; the second surface is the opposite surface of the first surface.

[0032] The first connection terminal 102 is connected to the first connector S1.

[0033] The metal layer 101 is electrically connected to the first connection terminal 102 and the positive terminal of the battery E1, forming a first line A connecting the first connection terminal 102 and the positive terminal of the battery E1.

[0034] The second connection terminal 103 is connected to the positive terminal E1 of the battery and the second connector S2 respectively, forming a second line B connecting the second connection terminal 103 to the positive terminal E1 of the battery.

[0035] The third connection terminal 104 is electrically isolated from the first connection terminal 102 and the second connection terminal 103 and disposed on the first surface for connection to the negative terminal E2 of the battery.

[0036] In this embodiment, the metal layer 101 can be a metal layer determined according to actual circuit business requirements, such as metal layers of different metal materials. The first connection terminal 102, the second connection terminal 103, and the third connection terminal 104 can be any terminal with connection function, and their specific shape and model can be determined according to actual needs, and are not limited here. For example, they can be connection interfaces. The circuit layer on the circuit board 1 is used to realize the connection of related devices in the circuit board.

[0037] The circuit board 1 has three connection terminals: a first connection terminal 102, a second connection terminal 103, and a third connection terminal 104. The first connector S1 and the metal layer 101 are electrically connected to the first connection terminal 102. The metal layer 101 can be directly connected to the first connection terminal 102, for example, by soldering it onto the first connection terminal 102. The metal layer 101 can also be connected to the positive terminal E1 of the battery, for example, by soldering it onto the positive terminal E1. After the metal layer 101 is connected to both the positive terminal E1 and the first connection terminal 102, a first line A is formed between the first connection terminal 102 and the positive terminal E1.

[0038] The second connection terminal 103 is electrically connected to the positive terminal of the battery E1 and the second connector S2, thereby connecting the second connection terminal 103 and the positive terminal of the battery E1 and allowing current to flow between them. The second connection terminal 103 and the positive terminal of the battery E1 can be directly connected; for example, the positive terminal of the battery E1 can be soldered onto the second connection terminal 103. The connection path formed by the direct connection between the second connection terminal 103 and the positive terminal of the battery E1 constitutes the second line B.

[0039] When charging the battery, the first line A can be used to transmit the current provided through the first connector S1 to the positive terminal E1 of the battery, and the second line B can be used to transmit the current provided through the second connector S2 to the positive terminal E1 of the battery. The current transmitted by the first line A and the current transmitted by the second line are separate before reaching the positive terminal E1 of the battery, and then they merge at the positive terminal E1 of the battery.

[0040] The charging current for the battery is split into positive currents via the first circuit A and the second circuit B. The currents flowing through both circuit A and circuit B are less than the current flowing through a single circuit. Therefore, the magnitude of the current has a significant impact on heat generation during battery charging. The sum of the heat generated when current flows through circuit A and the heat generated when current flows through circuit B is less than the heat generated when circuits A and B are combined into a single circuit.

[0041] Therefore, this solution reduces the problem of excessive heat generation and rapid temperature rise in the same circuit caused by combining the first connector S1 and the second connector S2 into one connector and transmitting the current through both connectors to the positive terminal E1 of the battery via the same line. In other words, by distributing the current transmitted from the first connector S1 and the second connector S2 to the positive terminal E1 of the battery, the current entering the positive terminal E1 is diverted, thereby reducing heat generation.

[0042] Similarly, when the battery is discharging, the current flowing out of the positive terminal of the battery is diverted through the first line A and the second line B, which can also reduce the heat generated by the lines.

[0043] A first line A is formed by connecting the first connection terminal 102 and the positive terminal E1 of the battery through the metal layer 101, and a second line B is formed by connecting the first connection terminal 102 and the positive terminal E1 of the battery through the second connection terminal 103. After the first connection terminal 102 and the second connection terminal 103 are respectively connected to the connector, current can be transmitted through the first line A and the second line B respectively. That is, the current passing through the first connection terminal 102 is transmitted between the positive terminal E1 of the battery and the first connection terminal 102 through the first line A, and the current passing through the second connection terminal 103 is transmitted between the positive terminal E1 of the battery and the second connection terminal 103 through the second line B. In this way, the current entering or leaving the positive terminal E1 of the battery can be split by two lines. Since the heat generation of the lines is more affected by the current, the heat generation of the first line A and the second line B is less than the heat generation of the lines before the current is split, thereby reducing the problem of excessive heat generation caused by excessive current, reducing the heat generation of the lines, and lowering the temperature rise of the lines.

[0044] This solution involves diverting the current associated with the positive electrode E1 of the battery. The current flowing into or out of the negative electrode E2 of the battery is not emphasized in this embodiment.

[0045] The third connection terminal 104 is electrically isolated from the first connection terminal 102 and the second connection terminal 103 and disposed on the first surface for connection to the negative terminal E2 of the battery. The first connector S1 and the second connector S2 can also be connected to the negative terminal E2 of the battery through the third terminal, forming a circuit of the first connector S1 and a circuit of the second connector S2.

[0046] On another level, in this embodiment, the second connection terminal 103 is directly connected to the positive terminal E1 of the battery, and the distance between the second connection terminal 103 and the positive terminal E1 is greater than the distance between the first connection terminal 102 and the positive terminal E1. Because the second connection terminal 103 is directly connected to the positive terminal E1, and the distance between the first connection terminal 102 and the positive terminal E1 is greater than the distance between the second connection terminal 103 and the positive terminal E1, the impedance of the first line A can be reduced through the metal layer 101, thereby reducing the difference between the impedance of the second line B and the impedance of the first line A, making the impedance of the first line A and the impedance of the second line B tend to be equal.

[0047] Since the maximum current flowing through the charging circuits corresponding to the first connector S1 and the second connector S2 is predetermined, it is usually equal, allowing for maximum power charging. However, if the current difference between the two connector circuits is large—one circuit's current is less than the maximum current flowing through, and the other's current is greater—the circuit with the greater current can only handle the maximum current. Therefore, in this case, the maximum power of the charging circuits corresponding to the two connectors is less than the rated maximum power, and maximum power charging cannot be achieved.

[0048] For example, the voltages corresponding to the first connector S1 and the second connector S2 are the same, and the maximum charging current transmitted to the first line A and the second line B through the first connector S1 and the second connector S2 is 6 amps each. The total current of the charger is fixed, for example, 12 amps. If the circuit corresponding to the first connector shuns 7 amps and the circuit corresponding to the second connector shuns 5 amps, that is, the current transmitted to the first line A through the first connector S1 is 7 amps and the current transmitted to the second line B through the second connector S2 is 5 amps, then the maximum current transmitted to the first line A through the first connector S1 is 6 amps and the current transmitted to the second line B through the second connector S2 is 5 amps. Therefore, the maximum current of the two lines is only 11 amps, which is less than 12 amps, and maximum power charging cannot be achieved.

[0049] Maximum power charging is achieved when the difference in current flowing through the two lines exceeds a certain value. The current flowing through the two lines depends on their impedance; the higher the impedance, the lower the current, and vice versa. Therefore, this scheme connects the first connector 102 and the positive terminal E1 of the battery through the metal layer 101, reducing the impedance between the first connector 102 and the positive terminal E1 of the battery. This brings the impedance of the first line A closer to the impedance of the second line B, thereby making the current in the two lines approximately equal and achieving maximum power charging.

[0050] In this embodiment, the impedance of the metal layer 101 is less than the impedance of the circuit layer in the circuit board 1, so the impedance between the first connector 102 and the positive terminal E1 of the battery can be reduced through the metal layer 101.

[0051] The smaller the impedance difference between the first line A and the second line B, the more equal the currents flowing through the first line A and the second line B become. This reduces the problem of a large impedance difference between the first connection terminal 102 and the battery positive terminal E1 caused by the connection of the first connection terminal 102 to the battery positive terminal E1 via the lines on the circuit board 1, which in turn leads to a large current difference between the first terminal 102 and the second terminal 103, preventing maximum power charging. This solution facilitates maximum power charging.

[0052] In another embodiment, the metal layer 101 on the circuit board 1 may be located on the same surface of the circuit board 1 as the first connection terminal 102, the second connection terminal 103 and the third connection terminal 104, or it may be located on different surfaces of the circuit board 1.

[0053] In another embodiment, the first connecting terminal 102 and the second connecting terminal 103 are symmetrically located on both sides of the third connecting terminal 104.

[0054] On another level, the first and second connection terminals are connected by a metal layer located on the surface of circuit board 1. This reduces the number of wiring layers required in circuit board 1, thus eliminating the need for the wiring layer connecting the first and second connection terminals. This reduces the number of layers and thickness of circuit board 1, thereby reducing its cost. For example, a 10-layer circuit board can be reduced to an 8-layer board. Simultaneously, it reduces the space occupied by the circuit board, providing more space for the battery and potentially increasing its capacity.

[0055] refer to Figure 2 This is a schematic diagram of a circuit board structure. Figure 2 Part a is a front view of the circuit board. Figure 2Part b is a reverse view of the circuit board. B+ is the second connection terminal 103, B+1 is the first connection terminal 102, and B- is the third connection terminal 104. B+ and B+1 are symmetrically located on both sides of B-. This reduces the crossing and overlap of the lines from the first connection terminal 102 and the second connection terminal 103 to the positive terminal E1 of the battery, thereby reducing the accumulation of heat generated by the lines and facilitating heat dissipation.

[0056] In this circuit board, the positive terminal of the battery is located at B+ corresponding to the second connection terminal 103. The second connection terminal 103 can be directly connected to the positive terminal of the battery, so the impedance of the second line B is relatively low. The B+1 corresponding to the first connection terminal 102 is connected to the positive terminal of the battery located at B+ through a metal layer. The metal layer acts as the first line A, connecting the first connection terminal 102 to the positive terminal of the battery. Since the impedance of the metal layer is lower than the impedance of the lines in the circuit board's circuit layer, the impedance of the first line A can be reduced. This makes the impedances of the first line A and the second line B tend to be equal, reducing the current difference between the first line A and the second line B, and achieving maximum charging power.

[0057] refer to Figure 3 This is a schematic diagram of another type of circuit board structure. The two ends of the metal layer 101 are respectively connected to... Figure 2 The first connection terminal 102 corresponding to B+1 is connected to the positive battery terminal E1 located at B+, forming the first line A. The metal layer 101 can be connected to the first connection terminal 102 and the positive battery terminal E1 by soldering. Figure 3 The first connector S1 and the second connector S2 are also shown.

[0058] In another embodiment, the length of the first line A is greater than the length of the second line B. (See reference) Figure 2 In the circuit board shown, the positive terminal E1 of the battery is connected to point B+, which corresponds to the second connection terminal 103. Point B+1 corresponds to the first connection terminal 102. Therefore, the distance from the first connection terminal 102 to the positive terminal of the battery is greater than the distance from the second connection terminal to the positive terminal of the battery. If the first connection terminal 102 is connected to the positive terminal of the battery through a line in the circuit layer on circuit board 1, the impedance between the first connection terminal 102 and the positive terminal of the battery will be large. This will result in a large impedance difference with the second line, causing the difference in current shunt between the first line and the second line to exceed the preset range, thus failing to meet the maximum power charging requirement.

[0059] The metal layer 101 can make the difference between the impedance of the first line and the impedance of the second line within a first preset range, so that the difference between the current shunt by the first line and the second line is within the preset range, thereby achieving maximum power charging.

[0060] In another embodiment, the metal layer 101 is a copper-nickel plated metal layer. Since copper-nickel plated metal has very low impedance, the copper-nickel plated metal layer can minimize the impedance of the first line and keep the impedance of the first line and the impedance of the second line balanced.

[0061] In one embodiment, the impedance of the first line and the impedance of the second line are approximately 1:1.

[0062] In one embodiment, the impedance of the metal layer is less than 1 milliohm.

[0063] In one embodiment, the impedance of the first line and the impedance of the second line are both less than or equal to 4 milliohms.

[0064] In one embodiment, the difference between the impedance of the first line and the impedance of the second line is less than 0.5 milliohms.

[0065] The first connection terminal and the positive terminal of the battery are connected by a metal layer with low impedance to form a first circuit, and the second connection terminal is directly connected to the positive terminal of the battery. Since the two are close to each other, the impedance of the second circuit is also low. This reduces the impedance of the circuit connected to the positive terminal of the battery in the whole circuit board, thereby reducing heat generation.

[0066] In another embodiment, reference Figure 1 The circuit structure also includes:

[0067] The third line C is electrically connected to the third connection terminal 104 and the first connection terminal 102 respectively, and the third line C and the first line A form a circuit;

[0068] The fourth line D is electrically connected to the third connection terminal 104 and the second connection terminal 103 respectively, and the fourth line D and the second line B form a circuit; wherein, the third line C and the fourth line D are connected in parallel to the negative terminal of the battery.

[0069] The third circuit C connects the negative terminal E2 of the battery to the first connector S1. After connecting the negative terminal E2 of the battery to the first connector S1, it forms a loop with the first line A for the first connector S1. The fourth circuit D connects the negative terminal E2 of the battery to the second connector S2. After connecting the negative terminal E2 of the battery to the second connector S2, it forms a loop with the second line B for the second connector S2.

[0070] The third line C and the fourth line D are connected to the negative terminal E2 of the battery, forming two parallel lines. That is, the third line C and the fourth line D are connected in parallel to the negative terminal E2. Through the parallel connection of the third line C and the fourth line D, the current flowing into or out of the negative terminal E2 is diverted. After diverting the current corresponding to the negative terminal E2, the current in both the third line C and the fourth line D is less than the total current before diversion. According to the principle of circuit heating, when the total current remains constant, the sum of the heat generated by the third line C and the fourth line D is less than the heat generated using the same line before diversion. Therefore, after diverting the current at the negative terminal through the third line C and the fourth line D, the heat generated in the line connected to the negative terminal E2 is reduced, thereby reducing the heating rate of the lines in circuit board 1.

[0071] In addition, the first line A and the second line B shunt the current corresponding to the positive terminal E1 of the battery, and the third line C and the fourth line D shunt the current corresponding to the negative terminal E2 of the battery, thus achieving simultaneous shunt of the current corresponding to the positive and negative terminals of the battery. This reduces the heat generation of the positive and negative terminal connection lines of the battery, thereby reducing the total heat generation of the circuit board.

[0072] In another embodiment, the impedance difference between the third line C and the fourth line D is within a second preset range.

[0073] When the impedance difference between the third line C and the fourth line D is within the second preset range, the ratio of their impedances can be kept as close to 1:1 as possible, so that the current shunt by the third line C and the fourth line D can be as equal as possible. Since the impedance difference between the first line A and the second line B is within the first preset range, the impedance of the loop of the first connector formed by the first line A and the third line C is approximately equal to the impedance of the loop of the second connector formed by the second line B and the fourth line D. The currents in the two loops are also approximately equal, and the difference between the currents in the two loops is within the specified range, thus facilitating the charging of the batteries to their maximum power.

[0074] In one embodiment, the difference between the impedance of the third line C and the impedance of the fourth line D is less than 0.5 milliohms.

[0075] In another embodiment, the circuit structure further includes:

[0076] The first protection module, the third line, and the fourth line are respectively connected to the negative terminal of the battery through their respective first protection modules, and are used to disconnect the third line and the fourth line when an abnormal charging or discharging occurs during the charging or discharging process of the battery.

[0077] The second protection module, the third line, and the fourth line are respectively connected to their respective second protection modules. The second protection module is connected in series with the first protection module and is used to disconnect the third line and the fourth line when the first protection module fails.

[0078] In this embodiment, both the first protection module and the second protection module can be modules with on and off functions, that is, after being connected to the third line and the fourth line, they can control the connection and disconnection of the third line and the fourth line. The specific structure and model are not limited here.

[0079] The third line C is connected to the negative terminal of the battery through the first protection module, and the fourth line D is also connected to the negative terminal of the battery through the first protection module. That is, the third line C and the fourth line D do not share a first protection module connected to the negative terminal of the battery, but rather the third line C and the fourth line D are each connected to a first protection module.

[0080] After the third line C and the fourth line D are connected to the first protection module, they can also be connected to the second protection module. The first and second protection modules in the third line C and the fourth line D are connected in series. That is, the third line C and the fourth line D do not share a second protection module, but each of the third line C and the fourth line D is connected to a second protection module.

[0081] The third line C is connected to the negative terminal of the battery through a set of first and second protection modules connected in series, and the fourth line D is connected to the negative terminal of the battery through another set of first and second protection modules connected in series.

[0082] The first protection modules connected to the third line C and the fourth line D can be the same type and model. Similarly, the second protection modules connected to the third line C and the fourth line D can be the same type and model. This ensures that the impedance difference between the third and fourth lines remains within a second preset range.

[0083] In another embodiment, the circuit structure further includes:

[0084] The first protection controller is connected to the first protection module and is used to control the state switching of the first protection module to cut off the third and fourth lines when an abnormal charging or discharging process is detected during battery charging or discharging.

[0085] The second protection controller, connected to the second protection module, is used to control the state switching of the second protection module to disconnect the third and fourth lines when an abnormal charging or discharging process is detected during battery charging or discharging and the first protection module fails.

[0086] In this embodiment, abnormal charging and discharging may include situations such as the current exceeding a current threshold during charging and discharging, continuing to charge when the battery capacity reaches a first preset capacity, continuing to discharge when the battery capacity is less than a second preset capacity, and short circuit.

[0087] The first protection controller can be a controller that controls the first protection module to turn on and off based on the magnitude of the current at the negative terminal of the battery. The second protection controller can be a controller that controls the second protection module to turn on and off based on the magnitude of the current at the negative terminal of the battery. The specific structure and model of the two protection controllers are not limited here.

[0088] The first protection controller is connected to the first protection module in the third line C and the first protection module in the fourth line D respectively. It can simultaneously control the first protection module connected in the third line C and the first protection module connected in the fourth line D, thereby realizing the function of simultaneously cutting off the third line C and the fourth line D.

[0089] For example, when the current at the negative terminal of the battery exceeds the current threshold, the first protection controller can simultaneously control the first protection module to shut down, thereby cutting off the third line C and the fourth line D, thus protecting the battery.

[0090] The second protection controller is connected to the second protection module in the third line C and the second protection module in the fourth line D respectively. It can simultaneously control the second protection module connected in the third line C and the second protection module connected in the fourth line D, so that when the first protection controller fails to successfully disconnect the third line C and the fourth line D, it can simultaneously disconnect the third line C and the fourth line D.

[0091] For example, if the second protection controller detects that the current at the negative terminal of the battery exceeds the current threshold, and the first protection controller does not control the first protection module to shut down, then the second protection controller controls the second protection module to shut down, thereby cutting off the third line C and the fourth line D, thus protecting the battery.

[0092] In another embodiment, the circuit structure further includes:

[0093] Current sampling module R, reference Figure 4 The two ends of the current sampling module are connected to the negative terminal of the battery and the first protection module, respectively, and are used to collect the current flowing through the battery when the battery is charging or discharging.

[0094] The first protection controller is connected to the current sampling module and is used to control the first protection module to disconnect the third and fourth lines based on the current collected by the current sampling module.

[0095] The second protection controller is connected to the current sampling module and is used to control the second protection module to disconnect the third and fourth lines based on the current collected by the current sampling module.

[0096] In this embodiment, the current sampling module can be a device with current sampling function, such as a sampling resistor. One end is connected to the negative terminal of the battery, and the other end is connected to the third and fourth lines respectively. This circuit sampling module collects the total current at the negative terminal of the battery. The total current corresponding to the negative terminal of the battery is the sum of the current in the third line C and the current in the fourth line D. When the current collected by the current sampling module exceeds the current threshold, it indicates that the current flowing through the battery is too large and may damage the battery. Therefore, the first protection controller and the second protection controller control the first protection module and the second protection module to shut down, thereby protecting the battery.

[0097] In another embodiment, reference Figure 4 This is a schematic diagram of another circuit structure.

[0098] The first connection terminal 102 includes a positive electrode P+ and a negative electrode P-, and the second connection terminal 103 includes a positive electrode P1+ and a negative electrode P1-. A metal layer 101 connects the positive electrode P+ of the first connection terminal 102 to the positive electrode E1 of the battery. The negative electrode P- of the first connection terminal 102 is connected to the negative electrode E2 of the battery via a third line C. The second connection terminal P1+ is connected to the positive electrode E1 of the battery via a second line, and the second connection terminal P1- is connected to the negative electrode E2 of the battery via a fourth line. The first protection module connected via the third line is called Q2, the first protection module connected via the fourth line is called Q1, the second protection module connected via the third line is called Q4, and the second protection module connected via the fourth line is called Q3.

[0099] The first protection module Q1 and the first protection module Q2 are modules of the same specification and may include:

[0100] The first MOSFET Qa and the second MOSFET Qb; the gate DO-1 of the first MOSFET Qa and the gate CO-1 of the second MOSFET Qb are respectively connected to the first protection controller M1, the source of the first MOSFET Qa is connected to the negative terminal of the battery E2, the drain of the first MOSFET Qa is connected to the drain of the second MOSFET Qb, and the source of the second MOSFET Qb is connected to the second protection module.

[0101] The second protection module Q3 and the second protection module Q4 can be modules of the same specifications, each including:

[0102] The third MOSFET Qc and the fourth MOSFET Qd; wherein, the gate DO-2 of the third MOSFET Qc and the gate CO-2 of the fourth MOSFET Qd are respectively connected to the second protection controller M2, the source of the third MOSFET Qc is connected to the source of the second MOSFET Qd, the drain of the third MOSFET Qc is connected to the drain of the fourth MOSFET Qd, and the source of the fourth MOSFET Qd is connected to the first connector S1 and the second connector S2.

[0103] The second protection module Q3, the second protection module Q4, the first protection module Q1, and the first protection module Q2 can be modules of the same specifications, and the MOSFETs they include can also be the same.

[0104] In the third circuit, the gate DO-1 of the first MOSFET Qa and the gate CO-1 of the second MOSFET Qb are connected to the first protection controller M1, respectively. The source of the first MOSFET Qa is connected to the negative terminal E2 of the battery. The drain of the first MOSFET Qa is connected to the drain of the second MOSFET Qb. The source of the second MOSFET Qb is connected to the source of the third MOSFET Qc. The drain of the third MOSFET Qc is connected to the drain of the fourth MOSFET Qd. The source of the fourth MOSFET Qd is connected to the first connector S1. The gates of the third MOSFET Qc and the fourth MOSFET Qd are connected to the second protection controller M2, respectively.

[0105] In the fourth circuit, the gate DO-1 of the first MOSFET Qa and the gate CO-1 of the second MOSFET Qb are connected to the first protection controller M1, respectively. The source of the first MOSFET Qa is connected to the negative terminal E2 of the battery. The drain of the first MOSFET Qa is connected to the drain of the second MOSFET Qb. The source of the second MOSFET Qb is connected to the source of the third MOSFET Qc. The drain of the third MOSFET Qc is connected to the drain of the fourth MOSFET Qd. The source of the fourth MOSFET Qd is connected to the second connector S2. The gate DO-2 of the third MOSFET Qc and the gate CO-2 of the fourth MOSFET Qd are connected to the second protection controller M2, respectively.

[0106] During normal operation, both the first and second protection modules are in the ON state. For example, the first protection controller M1 includes a charging control pin CO-1 and a discharging control pin DO-1, and the second protection controller M2 includes a charging control pin CO-2 and a discharging control pin DO-2. The gates DO-1 of the first MOSFET Qa, CO-1 of the second MOSFET Qb, DO-2 of the third MOSFET Qc, and CO-2 of the fourth MOSFET Qd are all at high levels. When the battery charging is abnormal, the first protection controller outputs a low level to the gate CO-1 of the second MOSFET Qb; when the battery discharging is abnormal, the first protection controller outputs a low level to the gate DO-1 of the first MOSFET Qa.

[0107] In another embodiment, the circuit structure further includes:

[0108] A first flexible circuit board has its two ends connected to a first connector and a first connection terminal, respectively. The first flexible circuit board includes a first positive flexible line and a first negative flexible line. The first positive flexible line is connected to a metal layer through the first connection terminal, and the first negative flexible line is connected to a third line through the first connection terminal.

[0109] The second flexible circuit board has its two ends connected to the second connector and the second connection terminal, respectively. The second flexible circuit board includes a second positive flexible line and a second negative flexible line. The second positive flexible line is connected to the positive terminal of the battery through the second connection terminal; the second negative flexible line is connected to the fourth line through the second connection terminal.

[0110] The difference between the impedance value of the first positive flexible circuit and the first sum value is less than or equal to the first threshold value; the first sum value is the sum of the impedance value of the second positive flexible circuit and the impedance value of the metal layer.

[0111] The sum of the impedance values ​​of the first positive flexible circuit and the first circuit is less than or equal to the second threshold; the sum of the impedance values ​​of the second positive flexible circuit and the second circuit is less than or equal to the second threshold.

[0112] The sum of the impedance values ​​of the first negative flexible circuit and the third circuit is less than or equal to the third threshold; the sum of the impedance values ​​of the second negative flexible circuit and the fourth circuit is less than or equal to the third threshold. Here, the third circuit includes the current sampling module; that is, the impedance of the third circuit includes the impedance of the current sampling module.

[0113] In this embodiment, the first threshold can be 1 milliohm, the second threshold can be 4 milliohms, and the third threshold can be 6.5 milliohms. The length difference between the length of the first flexible circuit board and the length of the second flexible circuit board is less than or equal to 9 mm. The distance between the first flexible circuit board and the edge of the battery is less than 30 mm.

[0114] refer to Figure 5 This is a graph showing the relationship between the impedance difference between the third and first negative flexible lines and the impedances of the fourth and second negative flexible lines, and the current difference between the third and fourth lines. The unit of impedance difference can be milliohms, and the unit of current can be amperes.

[0115] In this embodiment, the impedance difference between the third line and the first negative flexible line and the impedance difference between the fourth line and the second negative flexible line is no greater than 0.4 milliohms, and the current difference between the third line and the fourth line is no greater than 1 ampere.

[0116] In another embodiment, the circuit structure is suitable for charging circuits with a power of 67W or higher, such as charging circuits with a power of 120W, etc.

[0117] In another embodiment, an electronic device is also provided, comprising: the circuit structure of any of the above embodiments;

[0118] The battery is connected to the circuit structure.

[0119] In another embodiment, the circuit structure in any of the above embodiments can be applied to at least a mobile terminal, and the electronic device includes at least a mobile terminal. The mobile terminal may include mobile phones, tablets, in-vehicle central control devices, wearable devices, smart devices, etc., and the smart device may further include smart office equipment and smart home equipment, etc.

[0120] In another embodiment,

[0121] 1. The circuit board may include a protection board. The protection board uses a triode design to balance the master-slave charging current. To reduce the overall path impedance of the protection board while maintaining a near 1:1 impedance ratio between the master and slave charging paths, a bass bar is introduced in the master charging path. This bass bar is made of nickel-plated copper, and its impedance is controlled to be within 1 mohm. The first, second, and third connection terminals constitute the triode design. The metal layer is the bass bar.

[0122] 2. During charging, the current from the main connector passes through the FPC and then converges at the positive terminal of the battery cell via the Basbar, avoiding heat accumulation with the PCB. At the same time, the Basbar impedance is also extremely low, so the heat generated at the entire positive terminal is minimal.

[0123] 3. The negative terminal is designed with a current shunt, using two 1mohm MOSFETs in parallel to reduce the PCM impedance and the impedance of the circuit in the whole board. After passing through Rsense (sampling resistor), the current is shunted. The board layout and the three connection terminals are symmetrically designed, and the master-slave path impedance in the rigid board area is 1:1.

[0124] 4. The positive impedance difference of the entire charging path must not exceed 1.5 ohms (including the motherboard path), and the battery protection board impedance must be ≤0.5 mohm; the connector position design requirements are as follows;

[0125] The first flexible circuit board includes a long FPC, and the second flexible circuit board includes a short FPC.

[0126] Long FPC impedance - (short FPC impedance + Bas-bar) ≤ 1 mohm

[0127] The impedances of the first and second lines corresponding to the positive terminal of the battery are not greater than 4 milliohms, that is: master / slave impedance ≤ 4 mohm;

[0128] The impedances of the third and fourth lines corresponding to the negative terminal of the battery are no greater than 6.5 milliohms, i.e., the master / slave impedance is ≤6.5 mohm (including Rsense and MOS).

[0129] Long FPC - Short FPC ≤ 9mm (relative position).

[0130] The length of the long FPC relative to the battery side does not exceed 30mm (size 1).

[0131] 5. The motherboard has a common ground design, and the negative current of the master and slave paths is physically shunt according to the impedance of the protection board.

[0132] By controlling the pin design and placement requirements of the master-slave connector, the negative impedance can be controlled at 0.4 mohm;

[0133] Master-slave splitting is less than 1A;

[0134] While achieving 120W charging for a single battery cell, the following beneficial effects are achieved:

[0135] 1. The board width is 6.0mm, with some areas at 5.4mm. The board width is reduced by 2mm+, resulting in a capacity gain of over 2%.

[0136] 2. Positive electrode Bas-bar shunt, heat dissipation, PCB optimization from 10 layers to 8 layers, cost reduction of more than 0.5 RMB.

[0137] 3. The impedance difference between the positive and negative master-slave paths is less than 0.5mΩ, resulting in better impedance matching.

[0138] 4. The total impedance of the PCM is reduced by 4mΩ+.

[0139] It should be noted that the terms "first" and "second" in the embodiments of this disclosure are for ease of description and distinction only, and have no other specific meaning.

[0140] Figure 6 This is a block diagram illustrating a terminal device according to an exemplary embodiment. For example, the terminal device may be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, etc.

[0141] Reference Figure 6 The terminal device may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input / output (I / O) interface 812, sensor component 814, and communication component 816.

[0142] Processing component 802 typically controls the overall operation of the terminal device, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 802 may include one or more processors 820 to execute instructions. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0143] Memory 804 is configured to store various types of data to support operation on the terminal device. Examples of this data include instructions for any application or method operating on the terminal device, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0144] Power component 806 provides power to various components of the terminal device. Power component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the terminal device.

[0145] Multimedia component 808 includes a screen that provides an output interface between a terminal device and a user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When the terminal device is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0146] Audio component 810 is configured to output and / or input audio signals. For example, audio component 810 includes a microphone (MIC) configured to receive external audio signals when the terminal device is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 804 or transmitted via communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

[0147] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0148] Sensor assembly 814 includes one or more sensors for providing status assessments of various aspects of the terminal device. For example, sensor assembly 814 can detect the on / off state of the terminal device, the relative positioning of components such as the display and keypad of the terminal device, changes in the position of the terminal device or a component of the terminal device, the presence or absence of user contact with the terminal device, the orientation or acceleration / deceleration of the terminal device, and temperature changes of the terminal device. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, a gyroscope, a magnetometer, a pressure sensor, or a temperature sensor.

[0149] Communication component 816 is configured to facilitate wired or wireless communication between the terminal device and other devices. The terminal device can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0150] In an exemplary embodiment, the terminal device may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0151] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0152] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A circuit structure connected to a battery, characterized in that, include: A circuit board includes multiple stacked circuit layers and a metal layer disposed on a first surface of the multiple circuit layers; wherein, a second surface of the multiple circuit layers has a first connection terminal, a second connection terminal, and a third connection terminal; the second surface is the opposite surface of the first surface; The first connection terminal is connected to the first connector; The metal layer is electrically connected to the first connection terminal and the positive terminal of the battery, respectively, forming a first line connecting the first connection terminal and the positive terminal of the battery. The second connection terminal is connected to the positive terminal of the battery and the second connector respectively, forming a second line connecting the second connection terminal to the positive terminal of the battery; the distance between the first connection terminal and the positive terminal of the battery is greater than the distance between the second connection terminal and the positive terminal of the battery; the length of the first line is greater than the length of the second line; the difference between the impedance of the first line and the impedance of the second line is within a first preset range. The third connection terminal is electrically isolated from the first and second connection terminals and disposed on the second surface, and is used to connect to the negative terminal of the battery.

2. The circuit structure according to claim 1, characterized in that, The first and second connecting terminals are symmetrically located on both sides of the third connecting terminal.

3. The circuit structure according to claim 1, characterized in that, The metal layer is a copper-nickel plated metal layer.

4. The circuit structure according to claim 1, characterized in that, The circuit structure also includes: The third line is electrically connected to the third connection terminal and the first connection terminal respectively, and the third line and the first line form a circuit; The fourth line is electrically connected to the third connection terminal and the second connection terminal respectively, and the fourth line and the second line form a circuit; wherein the third line and the fourth line are connected in parallel to the negative terminal of the battery.

5. The circuit structure according to claim 4, characterized in that, The impedance difference between the third line and the fourth line is within a second preset range.

6. The circuit structure according to claim 4, characterized in that, The circuit structure also includes: The first protection module, wherein the third line and the fourth line are respectively connected to the negative terminal of the battery through their respective first protection modules, is used to disconnect the third line and the fourth line when an abnormal charging or discharging occurs during the charging or discharging process of the battery; The second protection module is connected to the third and fourth lines respectively. The second protection module is connected in series with the first protection module and is used to disconnect the third and fourth lines when the first protection module fails.

7. The circuit structure according to claim 6, characterized in that, The circuit structure also includes: A first protection controller, connected to the first protection module, is used to control the state switching of the first protection module when an abnormal charging or discharging process is detected during battery charging or discharging, so as to cut off the third line and the fourth line. The second protection controller, connected to the second protection module, is used to control the state switching of the second protection module to disconnect the third and fourth lines when an abnormal charging or discharging process is detected during battery charging or discharging and the first protection module fails.

8. The circuit structure according to claim 7, characterized in that, The circuit structure also includes: A current sampling module, the two ends of which are respectively connected to the negative terminal of the battery and the first protection module, is used to collect the current flowing through the battery when the battery is charging or discharging; The first protection controller is connected to the current sampling module and is used to control the first protection module to disconnect the third line and the fourth line according to the current collected by the current sampling module. The second protection controller is connected to the current sampling module and is used to control the second protection module to disconnect the third line and the fourth line when the first protection module fails, based on the current collected by the current sampling module.

9. The circuit structure according to claim 7, characterized in that, The first protection module includes: A first MOSFET and a second MOSFET; wherein the gate of the first MOSFET and the gate of the second MOSFET are respectively connected to the first protection controller, the source of the first MOSFET is connected to the negative terminal of the battery, the drain of the first MOSFET is connected to the drain of the second MOSFET, and the source of the second MOSFET is connected to the second protection module. The second protection module includes: A third MOS transistor and a fourth MOS transistor; wherein the gate of the third MOS transistor and the gate of the fourth MOS transistor are respectively connected to the second protection controller, the source of the third MOS transistor is connected to the source of the second MOS transistor, the drain of the third MOS transistor is connected to the drain of the fourth MOS transistor, and the source of the fourth MOS transistor is connected to the first connector and the second connector.

10. The circuit structure according to claim 4, characterized in that, The circuit structure also includes: A first flexible circuit board has its two ends connected to a first connector and a first connection terminal, respectively; wherein, the first flexible circuit board includes a first positive flexible line and a first negative flexible line; the first positive flexible line is connected to the metal layer through the first connection terminal; the first negative flexible line is connected to the third line through the first connection terminal; The second flexible circuit board has two ends connected to the second connector and the second connection terminal, respectively; wherein, the second flexible circuit board includes a second positive flexible line and a second negative flexible line; the second positive flexible line is connected to the positive terminal of the battery through the second connection terminal; the second negative flexible line is connected to the fourth line through the second connection terminal; The difference between the impedance value of the first positive electrode flexible circuit and the first sum value is less than or equal to the first threshold value; the first sum value is the sum of the impedance value of the second positive electrode flexible circuit and the impedance value of the metal layer; The sum of the impedance values ​​of the first positive electrode flexible circuit and the first circuit is less than or equal to the second threshold; the sum of the impedance values ​​of the second positive electrode flexible circuit and the second circuit is less than or equal to the second threshold. The sum of the impedance values ​​of the first negative electrode flexible circuit and the third circuit is less than or equal to a third threshold; the sum of the impedance values ​​of the second negative electrode flexible circuit and the fourth circuit is less than or equal to the third threshold.

11. An electronic device, characterized in that, include: The circuit structure according to any one of claims 1 to 10; The battery is connected to the circuit structure.

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