Protection board circuit, protection board, battery assembly and electronic equipment

Abstract

The embodiment of the present application provides a protection board circuit, a protection board, a battery assembly and an electronic device, wherein the protection board circuit includes: a fuel meter, a protection IC, a current sensing resistor, a first resistor module and a second resistor module; the current sensing resistor is electrically connected to the fuel meter; one end of the first resistor module is electrically connected to one end of the current sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current sensing resistor; one end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module, and the first resistor module is used to divide the voltage of the current sensing resistor to adapt the voltage signal corresponding to the protection IC. Compatibility between the fuel meter and the protection IC is achieved by dividing the voltage of the current sensing resistor, avoiding the current sensing resistor flowing through a large current resulting in a large package size and power. It is beneficial to reduce heat generation and production costs, as well as miniaturization design.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic devices, and specifically relates to a protection board circuit, a protection board, a battery assembly and an electronic device. Background Art

[0002] In 3C (Computer, Communication, Consumer) electronic devices, a protection board is usually used to protect the battery circuit. The protection board is provided with a circuit structure, which plays a relatively important role.

[0003] In the prior art, the protection board circuit usually includes a fuel meter and a protection IC (Integrated Circuit). In order to meet the overcurrent requirements in various situations, the fuel meter and the protection IC are usually respectively provided with precision resistors of different types to respectively realize overcurrent detection of the fuel meter and the protection IC, that is, the same precision resistor cannot be compatible with the fuel meter and each protection IC. Moreover, the protection board is provided with multiple precision resistors, which will increase the internal resistance and easily cause heat and cause safety hazards. In addition, multiple precision resistors also occupy a large space on the protection board, which is conducive to the miniaturization design of the product. Utility Model Content

[0004] In view of the above problems, the present invention is proposed to provide a protection board circuit, a protection board, a battery assembly and an electronic device that overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a protection board circuit, including: a power meter, a protection IC, a current sensing resistor, a first resistance module, and a second resistance module;

[0007] The current sensing resistor is electrically connected to the electricity meter;

[0008] One end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor;

[0009] One end of the protection IC is electrically connected to one end of the first resistance module, and the other end of the protection IC is electrically connected to the other end of the first resistance module. The first resistance module is used to divide the voltage of the current detection resistor to adapt to the voltage signal corresponding to the protection IC.

[0010] Optionally, the first resistor module includes a first resistor and a second resistor, and the protection IC includes a first IC and a second IC;

[0011] One end of the first resistor is electrically connected to one end of the current-sensing resistor, one end of the second resistor is electrically connected to the other end of the first resistor, and the other end of the second resistor is electrically connected to one end of the second resistor module;

[0012] One end of the first IC is electrically connected to one end of the first resistor, and the other end of the first IC is electrically connected to the other end of the first resistor, and the first resistor is used to divide the voltage of the first resistor module to adapt to the voltage signal corresponding to the first IC;

[0013] One end of the second IC is electrically connected to one end of the first resistor, and the other end of the second IC is electrically connected to the other end of the second resistor. The first resistor and the second resistor are used to divide the voltage of the current sensing resistor to adapt to the voltage signal corresponding to the second IC.

[0014] Optionally, the protection board circuit further includes a third resistor, and the protection IC further includes a third IC;

[0015] One end of the third resistor is electrically connected to one end of the second resistor, and the other end of the third resistor is electrically connected to one end of the second resistor module;

[0016] One end of the third IC is electrically connected to one end of the first resistor, and the other end of the third IC is electrically connected to the other end of the third resistor. The first resistor, the second resistor and the third resistor are used to divide the voltage of the current sensing resistor to adapt to the voltage signal corresponding to the third IC.

[0017] Optionally, the protection board circuit further includes a first resistor and a second resistor, and the protection IC further includes a fourth IC;

[0018] One end of the first resistor is electrically connected to one end of the first resistor module, one end of the second resistor is electrically connected to the other end of the first resistor, and the other end of the second resistor is electrically connected to the other end of the first resistor module;

[0019] One end of the fourth IC is electrically connected to one end of the first resistor, and the other end of the fourth IC is electrically connected to the other end of the first resistor. The first resistor is used to divide the voltage of the first resistor module to adapt to the voltage signal corresponding to the fourth IC.

[0020] Optionally, the protection IC further includes a fifth IC, and the protection board circuit further includes a third resistor and a fourth resistor;

[0021] One end of the third resistor is electrically connected to one end of the first resistor, one end of the fourth resistor is electrically connected to the other end of the third resistor, and the other end of the fourth resistor is electrically connected to the other end of the first resistor;

[0022] One end of the fifth IC is electrically connected to one end of the third resistor, and the other end of the fifth IC is electrically connected to the other end of the third resistor. The third resistor is used to divide the voltage of the first resistor to adapt to the voltage signal corresponding to the fifth IC.

[0023] Optionally, the protection IC further includes a sixth IC, and the protection board circuit further includes a fifth resistor and a sixth resistor;

[0024] One end of the fifth resistor is electrically connected to one end of the second resistor module, one end of the sixth resistor is electrically connected to the other end of the fifth resistor, and the other end of the sixth resistor is electrically connected to the other end of the second resistor module;

[0025] One end of the sixth IC is electrically connected to one end of the fifth resistor, and the other end of the sixth IC is electrically connected to the other end of the fifth resistor. The fifth resistor is used to divide the voltage of the second resistor module to adapt to the voltage signal corresponding to the sixth IC.

[0026] Optionally, the protection IC further includes a seventh IC, and the protection board circuit further includes a seventh resistor and an eighth resistor;

[0027] One end of the seventh partial resistor is electrically connected to one end of the fifth partial resistor, one end of the eighth partial resistor is electrically connected to the other end of the seventh partial resistor, and the other end of the eighth partial resistor is electrically connected to the other end of the fifth partial resistor;

[0028] One end of the seventh IC is electrically connected to one end of the seventh resistor, and the other end of the seventh IC is electrically connected to the other end of the seventh resistor. The seventh resistor is used to divide the voltage of the fifth resistor to adapt to the voltage signal corresponding to the seventh IC.

[0029] In a second aspect, an embodiment of the present application proposes a protection board, which includes the protection board circuit.

[0030] In a third aspect, an embodiment of the present application proposes a battery assembly, which includes a battery cell and the protection plate, and the protection plate is electrically connected to the battery cell.

[0031] In a fourth aspect, an embodiment of the present application provides an electronic device, wherein the electronic device includes the battery assembly.

[0032] In an embodiment of the present application, the protection board circuit includes: a fuel gauge, a protection IC, a current-sensing resistor, a first resistor module, and a second resistor module; the current-sensing resistor is electrically connected to the fuel gauge; one end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor; one end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module. The first resistor module is used to divide the voltage of the current-sensing resistor to adapt to the voltage signal corresponding to the protection IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. In this way, the current in the loop can be detected by the current-sensing resistor, and the voltage in the loop can be detected by the fuel gauge. One end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor, that is, the first resistor module and the second resistor module are connected in series, and then the two are connected in parallel to the two ends of the current-sensing resistor, so that the voltage across the two ends of the current-sensing resistor is divided by the first resistor module and the second resistor module. One end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module, that is, the protection IC is connected in parallel to the two ends of the first resistor module. The voltage across the two ends of the first resistor module can be adapted to the voltage signal corresponding to the protection IC by setting the resistance value of the first resistor module. The voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action to meet the overcurrent requirements corresponding to different protection ICs. Therefore, according to Ohm's law U=IR, when the internal resistance of the protection IC is determined, the current flowing through the protection IC can be obtained according to the voltage across the two ends of the protection IC to realize overcurrent detection of the protection IC. In this way, only one precision resistor needs to be set in the protection board circuit as the current detection resistor, so that overcurrent detection of the power meter and the protection IC can be realized at the same time. That is, the current detection resistor can achieve compatibility with the power meter and the protection IC, and there is no need to set different precision resistors for different protection ICs. The increase in internal resistance caused by setting multiple precision resistors is avoided, and the safety hazard caused by heating of the protection board is reduced. In addition, the first resistance module and the second resistance module can use ordinary signal resistors with a small size, which reduces the space occupied by multiple precision resistors on the protection board, is conducive to the miniaturization design of the product, and also reduces the production cost.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 is a schematic diagram of a protection board circuit described in an embodiment of the present application;

[0036] Figure 2 It is a partially enlarged schematic diagram of a protection board circuit described in an embodiment of the present application;

[0037] Figure 3 It is another partially enlarged schematic diagram of a protection board circuit described in an embodiment of the present application.

[0038] Figure numerals: 10 - fuel gauge; 20 - protection IC; 30 - current sensing resistor; 40 - first resistor module; 50 - second resistor module; 41 - first resistor; 42 - second resistor; 21 - first IC; 22 - second IC; 43 - third resistor; 23 - third IC; 51 - first sub-resistor; 52 - second sub-resistor; 53 - third sub-resistor; 54 - fourth sub-resistor; 55 - fifth sub-resistor; 56 - sixth sub-resistor; 57 - seventh sub-resistor; 58 - eighth sub-resistor. DETAILED DESCRIPTION

[0039] The embodiments of the utility model will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Reference Figures 1 to 3 , shows a schematic diagram of a protection board circuit described in an embodiment of the present application, and the protection board circuit may specifically include: an electric meter 10, a protection IC 20 (Integrated Circuit), a current sensing resistor 30, a first resistor module 40 and a second resistor module 50; the current sensing resistor 30 is electrically connected to the electric meter 10; one end of the first resistor module 40 is electrically connected to one end of the current sensing resistor 30, one end of the second resistor module 50 is electrically connected to the other end of the first resistor module 40, and the other end of the second resistor module 50 is electrically connected to the other end of the current sensing resistor 30; one end of the protection IC 20 is electrically connected to one end of the first resistor module 40, and the other end of the protection IC 20 is electrically connected to the other end of the first resistor module 40, and the first resistor module 40 is used to divide the voltage of the current sensing resistor 30 to adapt the voltage signal corresponding to the protection IC 20, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action.

[0044] In the embodiment of the present application, the current in the loop can be detected by the current-sensing resistor 30, and the voltage in the loop can be detected by the electricity meter 10. One end of the first resistor module 40 is electrically connected to one end of the current-sensing resistor 30, one end of the second resistor module 50 is electrically connected to the other end of the first resistor module 40, and the other end of the second resistor module 50 is electrically connected to the other end of the current-sensing resistor 30, that is, the first resistor module 40 and the second resistor module 50 are connected in series, and then the two are connected in parallel to the two ends of the current-sensing resistor 30, so that the voltage across the two ends of the current-sensing resistor 30 is divided by the first resistor module 40 and the second resistor module 50. One end of the protection IC 20 is electrically connected to one end of the first resistance module 40, and the other end of the protection IC 20 is electrically connected to the other end of the first resistance module 40, that is, the protection IC 20 is connected in parallel to both ends of the first resistance module 40. The voltage across both ends of the first resistance module 40 can be adapted to the voltage signal corresponding to the protection IC 20 by setting the resistance value of the first resistance module 40. The voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action to meet the overcurrent requirements corresponding to different protection ICs 20. Therefore, the protection board circuit can be applied to various types of protection ICs 20, and various old materials, inventory materials, and dead materials of the protection IC 20 can be effectively utilized.

[0045] In the embodiment of the present application, specifically, according to Ohm's law U=IR, when the internal resistance of the protection IC 20 is determined, the current flowing through the protection IC 20 can be obtained according to the voltage across the two ends of the protection IC 20 to realize overcurrent detection of the protection IC 20. In this way, only one precision resistor needs to be set in the protection board circuit as the current detection resistor 30, so that the overcurrent detection of the electricity meter 10 and the protection IC 20 can be realized at the same time, that is, the current detection resistor 30 can realize the compatibility of the electricity meter 10 and the protection IC 20, and there is no need to set different precision resistors for different protection ICs 20. It avoids the increase of internal resistance caused by setting multiple precision resistors, and reduces the safety hazard caused by heating of the protection board. In addition, the first resistance module 40 and the second resistance module 50 can use ordinary signal resistors, which are small in size, reducing the space occupied by multiple precision resistors on the protection board, which is conducive to the miniaturization design of the product and reduces the production cost.

[0046] In the embodiment of the present application, specifically, the protection IC 20 is used to implement overcurrent protection for the circuit. When the voltage is too large or the current passing through is too large, the protection IC 20 will disconnect the circuit to implement overcharge protection, over-discharge protection, overcurrent or short circuit protection, etc. for the circuit structure.

[0047] Specifically, in the prior art, the electricity meter 10 realizes overcurrent detection of the electricity meter 10 through a corresponding precision resistor, and the protection IC 20 realizes overcurrent detection of the protection IC 20 through another corresponding precision resistor. The two precision resistors usually have different resistance values, and the two work separately. In the embodiment of the present application, the first resistor module 40 and the second resistor module 50 are connected in series and then connected in parallel to the two ends of the current sensing resistor 30. The voltage across the two ends of the current sensing resistor 30 is divided by the first resistor module 40 and the second resistor module 50, and then the protection IC 20 is connected in parallel to the two ends of the first resistor module 40, so that the protection IC 20 can also realize overcurrent detection through the current sensing resistor 30, so that the overcurrent detection of the protection IC 20 is associated with the overcurrent detection of the electricity meter 10, and there is no need to set a large and expensive precision resistor for current sensing on the protection IC 20.

[0048] In addition, in the embodiment of the present application, the second resistor module 50 may be the other of the two resistor modules. The embodiment of the present application does not limit which of the two resistor modules is used as the first resistor module 40 and the other as the second resistor module 50.

[0049] For example, in the embodiment of the present application, the current sensing resistor 30 can be a precision resistor, whose resistance is usually in the milliohm level, and has a large current flow capacity. The first resistor module 40 and the second resistor module 50 can be ordinary resistors such as signal resistors, whose resistance is usually in the hundred ohm level, and the current flow through the first resistor module 40 and the second resistor module 50 can be ignored in practical applications. The first resistor module 40 and the second resistor module 50 mainly play a voltage dividing role.

[0050] In the embodiment of the present application, for example, the voltage across the current sensing resistor 30 is U0, and the resistance is R0. According to Ohm's law, the overcurrent value of the electricity meter 10 can be obtained as I0=U0 / R0. Assuming the resistance of the first resistor module 40 is R1, and the resistance of the second resistor module 50 is R2, since the first resistor module 40 and the second resistor module 50 are connected in parallel to the two ends of the current sensing resistor 30, it can be obtained that the total voltage of the first resistor module 40 and the second resistor 42 is equal to the voltage U0 across the two ends of the current sensing resistor 30. Since the first resistor module 40 and the second resistor module 50 are connected in series, the total resistance of the two can be obtained as R1+R2. Then, according to Ohm's law, the current of the first resistor module 40 and the second resistor module 50 can be obtained as I=U0 / (R1+R2), and the voltage across the first resistor module 40 is U1=R1*U0 / (R1+R2), and the voltage across the second resistor module 50 is U2=R2*U0 / (R1+R2). The protection IC 20 is connected in parallel to the two ends of the first resistance module 40, and its voltage is equal to the voltage U1 at the two ends of the first resistance module 40. In this way, the current in the loop is measured by the current-sensing resistor 30, and the protection voltage value U3 is obtained according to Ohm's law U=IR. If the protection voltage value U3 is equal to or greater than the preset voltage threshold in the protection IC 20, the overcurrent protection is triggered, so that the protection voltage value U3 provided to the protection IC 20 for detection can be linearly adjusted through the normalized design, so that multiple protection ICs 20 share one current-sensing resistor 30, and there is no need to set a current-sensing resistor 30 for each protection IC 20.

[0051] Furthermore, it can be obtained from the above that the voltage across the protection IC 20 is U3=U1=R1*U0 / (R1+R2). Combined with U0=I0*R0, it can be obtained that U3=I0*R0*R1 / (R1+R2), that is, a linear proportional relationship is formed between the voltage signal U3 of the protection IC 20 and the overcurrent value I0 of the power meter 10. Different protection ICs 20 can be matched according to the overcurrent value of the power meter 10 by matching the corresponding resistance R1 of the first resistance module 40 and the resistance R2 of the second resistance module 50, thereby improving the compatibility with protection ICs 20 of different models and specifications.

[0052] Optionally, in the embodiment of the present application, the first resistor module 40 includes a first resistor 41 and a second resistor 42, and the protection IC 20 includes a first IC 21 and a second IC 22; one end of the first resistor 41 is electrically connected to one end of the current sensing resistor 30, one end of the second resistor 42 is electrically connected to the other end of the first resistor 41, and the other end of the second resistor 42 is electrically connected to one end of the second resistor module 50; one end of the first IC 21 is electrically connected to one end of the first resistor 41, and the other end of the first IC 21 is electrically connected to the other end of the first resistor 41, and the first resistor 41 is used to divide the voltage of the first resistor module 40 to adapt to the voltage signal corresponding to the first IC 21, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action; one end of the second IC 22 is electrically connected to one end of the first resistor 41, and the other end of the second IC 22 is electrically connected to the other end of the second resistor 42, and the first resistor 41 and the second resistor 42 are used to divide the voltage of the current sensing resistor 30 to adapt to the second IC 22, the voltage signal corresponding to which is the voltage signal required to trigger overcurrent protection or circuit logic action.

[0053] That is, the embodiment of the present application can further divide the voltage across the first resistor module 40 through the first resistor 41 and the second resistor 42 connected in series, that is, the first resistor module 40 is replaced by a plurality of resistors connected in series, the first IC 21 is connected in parallel to the two ends of the first resistor 41, and the resistance value of the first resistor 41 is set to adapt to the voltage signal of the first IC 21, and the second IC 22 is connected in parallel to the two ends of the first resistor 41 and the second resistor 42, and the resistance value of the first resistor 41 and the second resistor 42 is set to adapt to the voltage signal of the second IC 22, so that the protection board circuit can be compatible with a variety of protection ICs 20 of different models and specifications at the same time, and multiple protection ICs 20 can achieve overcurrent detection through the same current detection resistor 30.

[0054] For example, in the embodiments of the present application, Figure 2As shown, assuming that the resistance of the first resistor 41 is R5, and the resistance of the second resistor 42 is R6, since the first resistor 41, the second resistor 42 and the second resistor module 50 are all connected in series, it is known from the above content that the current in the loop where the first resistor 41, the second resistor 42 and the second resistor module 50 are located is I=U0 / (R1+R2), and since the first IC 21 is connected in parallel to both ends of the first resistor 41, the voltage across the first IC 21 is equal to the voltage across the first resistor 41, that is, the voltage across the first IC 21 is U5=R5*U0 / (R1+R2). Similarly, since the second IC 22 is connected in parallel to both ends of the first resistor 41 and the second resistor 42, the voltage across the second IC 22 is equal to the sum of the voltage across the first resistor 41 and the voltage across the second resistor 42, that is, the voltage across the second IC 22 is U6=(R5+R6)*U0 / (R1+R2).

[0055] In the embodiment of the present application, optionally, the protection board circuit also includes a third resistor 43, and the protection IC 20 also includes a third IC 23; one end of the third resistor 43 is electrically connected to one end of the second resistor 42, and the other end of the third resistor 43 is electrically connected to one end of the second resistor module 50; one end of the third IC 23 is electrically connected to one end of the first resistor 41, and the other end of the third IC 23 is electrically connected to the other end of the third resistor 43. The first resistor 41, the second resistor 42 and the third resistor 43 are used to divide the voltage of the current detection resistor 30 to adapt to the voltage signal corresponding to the third IC 23, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. In this way, the first resistor module 40 can be divided again by connecting the third resistor 43 in series, so as to adapt to more types and specifications of protection ICs 20, so that the protection board circuit can be compatible with more types and specifications of protection ICs 20 at the same time.

[0056] In addition, in the embodiment of the present application, the third IC 23 can also be connected in parallel to the two ends of the third resistor 43, and can be set according to the actual situation according to the resistance value of the resistor in stock, the voltage signal of the protection IC 20, etc., and the embodiment of the present application is not limited to this. In addition, the second resistor module 50 can also be replaced by a plurality of resistors connected in series, etc., and the embodiment of the present application is not limited to this.

[0057] Optionally, in the embodiment of the present application, the protection board circuit further includes a first resistance division 51 and a second resistance division 52, and the protection IC 20 further includes a fourth IC; one end of the first resistance division 51 is electrically connected to one end of the first resistor module 40, one end of the second resistance division 52 is electrically connected to the other end of the first resistance division 51, and the other end of the second resistance division 52 is electrically connected to the other end of the first resistor module 40; one end of the fourth IC is electrically connected to one end of the first resistance division 51, and the other end of the fourth IC is electrically connected to the other end of the first resistance division 51, and the first resistance division 51 is used to divide the voltage of the first resistor module 40 to adapt to the voltage signal corresponding to the fourth IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. That is, in the embodiment of the present application, the voltage at both ends of the current detection resistor 30 can also be divided by the first resistance division 51 and the second resistance division 52 connected in parallel to the first resistor module 40, enriching the layout of the circuit structure, so that the circuit structure can be set in a variety of ways as needed according to the actual structure of the protection board, enriching the application scenarios, and making the layout structure more flexible and convenient.

[0058] In some optional embodiments of the present application, the protection IC 20 also includes a fifth IC, and the protection board circuit also includes a third resistor 53 and a fourth resistor 54; one end of the third resistor 53 is electrically connected to one end of the first resistor 51, one end of the fourth resistor 54 is electrically connected to the other end of the third resistor 53, and the other end of the fourth resistor 54 is electrically connected to the other end of the first resistor 51; one end of the fifth IC is electrically connected to one end of the third resistor 53, and the other end of the fifth IC is electrically connected to the other end of the third resistor 53. The third resistor 53 is used to divide the voltage of the first resistor 51 to adapt to the voltage signal corresponding to the fifth IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. In this way, the first resistor 51 can be further divided again by the third resistor 53 and the fourth resistor 54, which further enriches the layout of the circuit structure and makes the protection board circuit compatible with a variety of protection ICs 20 of different models and specifications at the same time. In addition, the third dividing resistor 53 and the fourth dividing resistor 54 may also be connected in parallel to both ends of the second dividing resistor 52 , which is not limited in the embodiment of the present application.

[0059] Optionally, in the embodiment of the present application, the protection IC 20 also includes a sixth IC, and the protection board circuit also includes a fifth resistor 55 and a sixth resistor 56; one end of the fifth resistor 55 is electrically connected to one end of the second resistor module 50, one end of the sixth resistor 56 is electrically connected to the other end of the fifth resistor 55, and the other end of the sixth resistor 56 is electrically connected to the other end of the second resistor module 50; one end of the sixth IC is electrically connected to one end of the fifth resistor 55, and the other end of the sixth IC is electrically connected to the other end of the fifth resistor 55. The fifth resistor 55 is used to divide the voltage of the second resistor module 50 to adapt to the voltage signal corresponding to the sixth IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. In this way, the second resistor module 50 can also be divided by the fifth resistor 55 and the sixth resistor 56, enriching the layout of the circuit structure, so that the protection board circuit can be compatible with a variety of protection ICs 20 of different models and specifications.

[0060] In the embodiment of the present application, optionally, the protection IC 20 also includes a seventh IC, and the protection board circuit also includes a seventh resistor 57 and an eighth resistor 58; one end of the seventh resistor 57 is electrically connected to one end of the fifth resistor 55, one end of the eighth resistor 58 is electrically connected to the other end of the seventh resistor 57, and the other end of the eighth resistor 58 is electrically connected to the other end of the fifth resistor 55; one end of the seventh IC is electrically connected to one end of the seventh resistor 57, and the other end of the seventh IC is electrically connected to the other end of the seventh resistor 57. The seventh resistor 57 is used to divide the voltage of the fifth resistor 55 to adapt to the voltage signal corresponding to the seventh IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. Similarly, the voltage of the fifth resistor 55 can be divided again by the seventh resistor 57 and the eighth resistor 58, further enriching the layout of the circuit structure, so that the protection board circuit can be compatible with a variety of protection ICs 20 of different models and specifications at the same time. In addition, the seventh partial resistor 57 and the eighth partial resistor 58 may also be connected in parallel to both ends of the sixth partial resistor 56 , and this embodiment of the present application may not be limited to this.

[0061] For example, in the embodiment of the present application, the protection board circuit may also include multiple capacitors, which are respectively mounted on the power meter 10 and the protection IC 20. In addition, the protection board circuit may also include structures such as fuses. The settings of structures such as capacitors and fuses belong to the prior art and will not be repeated in the embodiment of the present application.

[0062] In summary, the protection board circuit described in the embodiment of the present application can at least include the following advantages:

[0063] In an embodiment of the present application, the protection board circuit includes: a fuel gauge, a protection IC, a current-sensing resistor, a first resistor module, and a second resistor module; the current-sensing resistor is electrically connected to the fuel gauge; one end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor; one end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module. The first resistor module is used to divide the voltage of the current-sensing resistor to adapt to the voltage signal corresponding to the protection IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. In this way, the loop current flowing through the fuel gauge can be detected by the current-sensing resistor, and the voltage in the loop can be detected by the fuel gauge. One end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor, that is, the first resistor module and the second resistor module are connected in series, and then the two are connected in parallel to the two ends of the current-sensing resistor, so that the voltage across the two ends of the current-sensing resistor is divided by the first resistor module and the second resistor module. One end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module, that is, the protection IC is connected in parallel to the two ends of the first resistor module. The voltage across the two ends of the first resistor module can be adapted to the voltage signal corresponding to the protection IC by setting the resistance value of the first resistor module. The voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action to meet the overcurrent requirements corresponding to different protection ICs. Therefore, according to Ohm's law U=IR, when the internal resistance of the protection IC is determined, the current flowing through the protection IC can be obtained according to the voltage across the two ends of the protection IC to realize overcurrent detection of the protection IC. In this way, only one precision resistor needs to be set in the protection board circuit as the current detection resistor, so that overcurrent detection of the power meter and the protection IC can be realized at the same time. That is, the current detection resistor can achieve compatibility with the power meter and the protection IC, and there is no need to set different precision resistors for different protection ICs. The increase in internal resistance caused by setting multiple precision resistors is avoided, and the safety hazard caused by heating of the protection board is reduced. In addition, the first resistance module and the second resistance module can use ordinary signal resistors with a small size, which reduces the space occupied by multiple precision resistors on the protection board, is conducive to the miniaturization design of the product, and also reduces the production cost.

[0064] The embodiment of the present application also proposes a protection board, which includes the protection board circuit.

[0065] For example, in an embodiment of the present application, the protection plate may be a printed circuit board (PCB), a flexible printed circuit board (FPC), or a combination of a printed circuit board and a flexible circuit board. The embodiment of the present application may not limit the specific type of the protection plate.

[0066] The protection plate described in the embodiment of the present application may at least have the following advantages:

[0067] In an embodiment of the present application, the protection board includes the protection board circuit, and the protection board circuit includes: an electric meter, a protection IC, a current-sensing resistor, a first resistor module and a second resistor module; the current-sensing resistor is electrically connected to the electric meter; one end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor; one end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module. The first resistor module is used to divide the voltage of the current-sensing resistor to adapt to the voltage signal corresponding to the protection IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. In this way, the current in the loop can be detected by the current-sensing resistor, and the voltage in the loop can be detected by the electric meter. One end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor, that is, the first resistor module and the second resistor module are connected in series, and then the two are connected in parallel to the two ends of the current-sensing resistor, so that the voltage across the two ends of the current-sensing resistor is divided by the first resistor module and the second resistor module. One end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module, that is, the protection IC is connected in parallel to the two ends of the first resistor module. The voltage across the two ends of the first resistor module can be adapted to the voltage signal corresponding to the protection IC by setting the resistance value of the first resistor module. The voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action to meet the overcurrent requirements corresponding to different protection ICs. Therefore, according to Ohm's law U=IR, when the internal resistance of the protection IC is determined, the current flowing through the protection IC can be obtained according to the voltage across the two ends of the protection IC to realize overcurrent detection of the protection IC. In this way, only one precision resistor needs to be set in the protection board circuit as the current detection resistor, so that overcurrent detection of the power meter and the protection IC can be realized at the same time. That is, the current detection resistor can achieve compatibility with the power meter and the protection IC, and there is no need to set different precision resistors for different protection ICs. The increase in internal resistance caused by setting multiple precision resistors is avoided, and the safety hazard caused by heating of the protection board is reduced. In addition, the first resistance module and the second resistance module can use ordinary signal resistors with a small size, which reduces the space occupied by multiple precision resistors on the protection board, is conducive to the miniaturization design of the product, and also reduces the production cost.

[0068] An embodiment of the present application provides a battery assembly, which includes a battery cell and the protection plate, and the protection plate is electrically connected to the battery cell.

[0069] For example, in the embodiment of the present application, the battery cell may be a lithium-ion battery cell, a polymer lithium battery cell, or a lithium iron phosphate battery cell, etc. The embodiment of the present application may not limit the specific type of the battery cell monomer.

[0070] The battery assembly described in the embodiment of the present application may at least have the following advantages:

[0071] In an embodiment of the present application, the battery assembly includes a battery cell and the protection board, the protection board is electrically connected to the battery cell, the protection board includes the protection board circuit, and the protection board circuit includes: a fuel gauge, a protection IC, a current sensing resistor, a first resistor module and a second resistor module; the current sensing resistor is electrically connected to the fuel gauge; one end of the first resistor module is electrically connected to one end of the current sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current sensing resistor; one end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module, and the first resistor module is used to divide the voltage of the current sensing resistor to adapt to the voltage signal corresponding to the protection IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. In this way, the current in the loop can be detected by the current sensing resistor, and the voltage in the loop can be detected by the fuel gauge. One end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor, that is, the first resistor module and the second resistor module are connected in series, and then the two are connected in parallel to the two ends of the current-sensing resistor, so that the voltage across the two ends of the current-sensing resistor is divided by the first resistor module and the second resistor module. One end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module, that is, the protection IC is connected in parallel to the two ends of the first resistor module. The voltage across the two ends of the first resistor module can be adapted to the voltage signal corresponding to the protection IC by setting the resistance value of the first resistor module. The voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action to meet the overcurrent requirements corresponding to different protection ICs. Therefore, according to Ohm's law U=IR, when the internal resistance of the protection IC is determined, the current flowing through the protection IC can be obtained according to the voltage across the two ends of the protection IC to realize overcurrent detection of the protection IC. In this way, only one precision resistor needs to be set in the protection board circuit as the current detection resistor, so that overcurrent detection of the power meter and the protection IC can be realized at the same time. That is, the current detection resistor can achieve compatibility with the power meter and the protection IC, and there is no need to set different precision resistors for different protection ICs. The increase in internal resistance caused by setting multiple precision resistors is avoided, and the safety hazard caused by heating of the protection board is reduced. In addition, the first resistance module and the second resistance module can use ordinary signal resistors with a small size, which reduces the space occupied by multiple precision resistors on the protection board, is conducive to the miniaturization design of the product, and also reduces the production cost.

[0072] An embodiment of the present application also provides an electronic device, which includes the battery assembly.

[0073] For example, in the embodiment of the present application, the electronic device may include but is not limited to any one of a mobile phone, a tablet computer and a wearable device, and the embodiment of the present application may not limit the specific type of the electronic device.

[0074] The electronic device described in the embodiments of the present application may at least have the following advantages:

[0075] In an embodiment of the present application, the electronic device includes the battery assembly, the battery assembly includes a battery cell and the protection board, the protection board is electrically connected to the battery cell, the protection board includes the protection board circuit, and the protection board circuit includes: a fuel gauge, a protection IC, a current sensing resistor, a first resistor module and a second resistor module; the current sensing resistor is electrically connected to the fuel gauge; one end of the first resistor module is electrically connected to one end of the current sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current sensing resistor; one end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module, and the first resistor module is used to divide the voltage of the current sensing resistor to adapt to the voltage signal corresponding to the protection IC, and the voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action. In this way, the current in the loop can be detected by the current sensing resistor, and the voltage in the loop can be detected by the fuel gauge. One end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor, that is, the first resistor module and the second resistor module are connected in series, and then the two are connected in parallel to the two ends of the current-sensing resistor, so that the voltage across the two ends of the current-sensing resistor is divided by the first resistor module and the second resistor module. One end of the protection IC is electrically connected to one end of the first resistor module, and the other end of the protection IC is electrically connected to the other end of the first resistor module, that is, the protection IC is connected in parallel to the two ends of the first resistor module. The voltage across the two ends of the first resistor module can be adapted to the voltage signal corresponding to the protection IC by setting the resistance value of the first resistor module. The voltage signal is the voltage signal required to trigger overcurrent protection or circuit logic action to meet the overcurrent requirements corresponding to different protection ICs. Therefore, according to Ohm's law U=IR, when the internal resistance of the protection IC is determined, the current flowing through the protection IC can be obtained according to the voltage across the two ends of the protection IC to realize overcurrent detection of the protection IC. In this way, only one precision resistor needs to be set in the protection board circuit as the current detection resistor, so that overcurrent detection of the power meter and the protection IC can be realized at the same time. That is, the current detection resistor can achieve compatibility with the power meter and the protection IC, and there is no need to set different precision resistors for different protection ICs. The increase in internal resistance caused by setting multiple precision resistors is avoided, and the safety hazard caused by heating of the protection board is reduced. In addition, the first resistance module and the second resistance module can use ordinary signal resistors with a small size, which reduces the space occupied by multiple precision resistors on the protection board, is conducive to the miniaturization design of the product, and also reduces the production cost.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A protection board circuit, characterized in that: The protection board circuit includes: a fuel gauge, a protection IC, a current sensing resistor, a first resistance module and a second resistance module; The current sensing resistor is electrically connected to the electricity meter; One end of the first resistor module is electrically connected to one end of the current-sensing resistor, one end of the second resistor module is electrically connected to the other end of the first resistor module, and the other end of the second resistor module is electrically connected to the other end of the current-sensing resistor; One end of the protection IC is electrically connected to one end of the first resistance module, and the other end of the protection IC is electrically connected to the other end of the first resistance module. The first resistance module is used to divide the voltage of the current detection resistor to adapt to the voltage signal corresponding to the protection IC.

2. The protection board circuit according to claim 1, characterized in that: The first resistor module includes a first resistor and a second resistor, and the protection IC includes a first IC and a second IC; One end of the first resistor is electrically connected to one end of the current-sensing resistor, one end of the second resistor is electrically connected to the other end of the first resistor, and the other end of the second resistor is electrically connected to one end of the second resistor module; One end of the first IC is electrically connected to one end of the first resistor, and the other end of the first IC is electrically connected to the other end of the first resistor, and the first resistor is used to divide the voltage of the first resistor module to adapt to the voltage signal corresponding to the first IC; One end of the second IC is electrically connected to one end of the first resistor, and the other end of the second IC is electrically connected to the other end of the second resistor. The first resistor and the second resistor are used to divide the voltage of the current sensing resistor to adapt to the voltage signal corresponding to the second IC.

3. The protection board circuit according to claim 2, characterized in that: The protection board circuit further includes a third resistor, and the protection IC further includes a third IC; One end of the third resistor is electrically connected to one end of the second resistor, and the other end of the third resistor is electrically connected to one end of the second resistor module; One end of the third IC is electrically connected to one end of the first resistor, and the other end of the third IC is electrically connected to the other end of the third resistor. The first resistor, the second resistor and the third resistor are used to divide the voltage of the current sensing resistor to adapt to the voltage signal corresponding to the third IC.

4. The protection board circuit according to claim 1, characterized in that: The protection board circuit further includes a first resistance division and a second resistance division, and the protection IC further includes a fourth IC; One end of the first resistor is electrically connected to one end of the first resistor module, one end of the second resistor is electrically connected to the other end of the first resistor, and the other end of the second resistor is electrically connected to the other end of the first resistor module; One end of the fourth IC is electrically connected to one end of the first resistor, and the other end of the fourth IC is electrically connected to the other end of the first resistor. The first resistor is used to divide the voltage of the first resistor module to adapt to the voltage signal corresponding to the fourth IC.

5. The protection board circuit according to claim 4, characterized in that: The protection IC also includes a fifth IC, and the protection board circuit also includes a third resistor and a fourth resistor; One end of the third resistor is electrically connected to one end of the first resistor, one end of the fourth resistor is electrically connected to the other end of the third resistor, and the other end of the fourth resistor is electrically connected to the other end of the first resistor; One end of the fifth IC is electrically connected to one end of the third resistor, and the other end of the fifth IC is electrically connected to the other end of the third resistor. The third resistor is used to divide the voltage of the first resistor to adapt to the voltage signal corresponding to the fifth IC.

6. The protection board circuit according to claim 1, characterized in that: The protection IC also includes a sixth IC, and the protection board circuit also includes a fifth resistor and a sixth resistor; One end of the fifth resistor is electrically connected to one end of the second resistor module, one end of the sixth resistor is electrically connected to the other end of the fifth resistor, and the other end of the sixth resistor is electrically connected to the other end of the second resistor module; One end of the sixth IC is electrically connected to one end of the fifth resistor, and the other end of the sixth IC is electrically connected to the other end of the fifth resistor. The fifth resistor is used to divide the voltage of the second resistor module to adapt to the voltage signal corresponding to the sixth IC.

7. The protection board circuit according to claim 6, characterized in that: The protection IC also includes a seventh IC, and the protection board circuit also includes a seventh resistor and an eighth resistor; One end of the seventh partial resistor is electrically connected to one end of the fifth partial resistor, one end of the eighth partial resistor is electrically connected to the other end of the seventh partial resistor, and the other end of the eighth partial resistor is electrically connected to the other end of the fifth partial resistor; One end of the seventh IC is electrically connected to one end of the seventh resistor, and the other end of the seventh IC is electrically connected to the other end of the seventh resistor. The seventh resistor is used to divide the voltage of the fifth resistor to adapt to the voltage signal corresponding to the seventh IC.

8. A protective plate, characterized in that: The protection board includes the protection board circuit according to any one of claims 1 to 7.

9. A battery assembly, characterized in that: The battery assembly includes a battery cell and the protection plate according to claim 8, and the protection plate is electrically connected to the battery cell.

10. An electronic device, characterized in that: The electronic device comprises the battery assembly according to claim 9.

Images