Battery protection board circuit, battery and electronic equipment

Abstract

The utility model relates to a battery protection board circuit, a battery and electronic equipment. According to the battery protection board circuit, all protection circuits in the battery protection board circuit are connected with the same resistance-capacitance circuit to realize resistance-capacitance sharing, and each protection circuit does not need to be connected with a resistor and a capacitor respectively, so that the patch number of the resistors and the capacitors can be reduced, and the patch cost of the battery protection board circuit is reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular to a battery protection board circuit, a battery, and an electronic device. Background Art

[0002] Currently, a large number of protection chips are used in the battery protection board circuit of electronic devices, and each protection chip needs to be connected to a resistor and a capacitor respectively, which results in a high chip mounting cost for the battery protection board circuit. Utility Model Content

[0003] This application provides a battery protection board circuit, a battery, and an electronic device to solve the problem of high chip mounting cost of the existing battery protection board circuit.

[0004] In a first aspect, this application provides a battery protection board circuit. The battery protection board circuit includes a resistor-capacitor circuit and a plurality of protection circuits. The resistor-capacitor circuit is connected between the positive and negative electrodes of the battery cell circuit, and each protection circuit is connected to the resistor-capacitor circuit and the negative electrode of the battery cell circuit.

[0005] Optionally, the number of battery cells in the battery cell circuit is the same as the number of resistor-capacitor branches in the resistor-capacitor circuit.

[0006] Optionally, when the resistor-capacitor circuit includes one resistor-capacitor branch, the first end of the resistor in the resistor-capacitor branch is connected to the positive electrode of the battery cell in the battery cell circuit, the second end of the resistor in the resistor-capacitor branch is respectively connected to the first end of the capacitor in the resistor-capacitor branch and the power supply terminals of each protection circuit, and the second end of the capacitor in the resistor-capacitor branch is respectively connected to the negative electrode of the battery cell in the battery cell circuit and the grounding terminals of each protection circuit.

[0007] Optionally, when the resistor-capacitor circuit includes a plurality of resistor-capacitor branches, each resistor-capacitor branch is sequentially connected in series between the positive and negative electrodes of the battery cell circuit. The first end of the resistor in the first resistor-capacitor branch is connected to the positive electrode of the battery cell circuit, the second end of the resistor in the first resistor-capacitor branch is respectively connected to the first end of the capacitor in the first resistor-capacitor branch and the power supply terminals of each protection circuit, the second end of the capacitor in the first resistor-capacitor branch is respectively connected to the first end of the resistor in the adjacent resistor-capacitor branch and the grounding terminals of each protection circuit, the second end of the capacitor in the last resistor-capacitor branch is connected to the negative electrode of the battery cell circuit and the grounding terminals of each protection circuit, and the connection line between the resistor and the capacitor in each resistor-capacitor branch is also connected to the power supply terminals of each protection circuit.

[0008] Optionally, the protection circuit includes a protection chip and a switch tube circuit that are electrically connected. The power supply terminal of the protection chip is connected to the connection line between the resistor and the capacitor in each of the resistor-capacitor branches. The ground terminal of the protection chip is connected to the second terminal of the capacitor in each of the resistor-capacitor branches. The switch tube circuits in each of the protection circuits are connected in series, and the switch tube circuit in the first protection circuit is connected to the negative electrode of the battery cell circuit.

[0009] Optionally, the switch tube circuit in the first protection circuit is connected to the negative electrode of the battery cell circuit through a sampling resistor.

[0010] Optionally, the switch tube circuit includes a protection switch tube and a protection capacitor. The first terminal of the protection switch tube is connected to the data storage terminal of the protection chip in the protection circuit to which it belongs. The second terminal of the protection switch tube is connected to the carry terminal of the protection chip in the protection circuit to which it belongs. The third terminal of the protection switch tube is connected to the connection terminal of the protection chip in the protection circuit to which it belongs through a connection resistor. The third terminal of the protection switch tube is also connected to the first terminal of the protection switch tube in the next adjacent protection circuit. The fourth terminal of the protection switch tube in the first protection circuit is connected to the negative electrode of the battery cell circuit through the sampling resistor. The fourth terminal of the protection switch tube in a non-first protection circuit is connected to the third terminal of the protection switch tube in the previous adjacent protection circuit.

[0011] Optionally, the protection switch tube includes a first field-effect transistor and a second field-effect transistor. The gate of the first field-effect transistor serves as the first terminal of the protection switch tube. The drain of the first field-effect transistor is connected to the source of the second field-effect transistor. The source of the first field-effect transistor serves as the fourth terminal of the protection switch tube. The gate of the second field-effect transistor serves as the second terminal of the protection switch tube. The drain of the second field-effect transistor serves as the third terminal of the protection switch tube.

[0012] In a second aspect, the present application provides a battery, which includes a battery cell and the battery protection board circuit as described in any one of the above.

[0013] In a third aspect, the present application provides an electronic device, which includes the above battery.

[0014] With the structure provided in the embodiments of the present application, each protection circuit in the battery protection board circuit is connected to the same resistor-capacitor circuit to achieve resistor-capacitor sharing, without the need for each protection circuit to be separately connected to a resistor and a capacitor. Therefore, the number of resistor and capacitor chip components can be reduced, thereby reducing the chip component cost of the battery protection board circuit. Description of the Drawings

[0015] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments in accordance with the present utility model, and are used together with the specification to explain the principles of the present utility model.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0018] Figure 1 A schematic structural diagram of a battery protection board circuit provided by an embodiment of the present application;

[0019] Figure 2 A schematic structural diagram of a battery protection board circuit provided by an embodiment of the present application;

[0020] Figure 3 A schematic structural diagram of a battery protection board circuit provided by an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a battery protection board circuit provided by an embodiment of the present application. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0024] In one embodiment,Figure 1 is a schematic flow diagram of a battery protection board circuit in an embodiment. Referring to Figure 1 , a battery protection board circuit is provided. The battery protection board circuit includes a resistor-capacitor circuit 120 and a plurality of protection circuits 130. The resistor-capacitor circuit 120 is connected between the positive and negative electrodes of the battery cell circuit 110, and each of the protection circuits 130 is connected to the resistor-capacitor circuit 120 and the negative electrode of the battery cell circuit 110.

[0025] Specifically, the battery cell circuit 110 includes at least one battery cell, and the battery cell is used to provide electrical energy. The resistor-capacitor circuit 120 includes a series-connected resistor and capacitor. The resistor and capacitor in the resistor-capacitor circuit 120 are used to limit current and filter. The protection circuit 130 is used to provide protection measures when the battery works abnormally and disconnect the circuit. Each protection circuit 130 is connected to the common resistor-capacitor circuit 120, and there is no need to connect a resistor-capacitor circuit 120 for each protection circuit 130 respectively, reducing the number of surface-mounted components of the resistor-capacitor circuit 120 in the battery protection board circuit, that is, reducing the number of surface-mounted components of the resistor and capacitor in the battery protection board circuit, thereby reducing the surface-mounting cost of the battery protection board circuit.

[0026] In an embodiment, the number of battery cells in the battery cell circuit 110 is the same as the number of resistor-capacitor branches 1201 in the resistor-capacitor circuit 120.

[0027] Specifically, as Figure 2 shown, the battery cell circuit 110 includes at least one battery cell, and the number of battery cells is the same as the number of resistor-capacitor branches 1201 in the resistor-capacitor circuit 120. That is, when the battery cell circuit 110 includes one battery cell, the resistor-capacitor circuit 120 only includes one resistor-capacitor branch 1201, and the resistor-capacitor branch 1201 includes a series-connected resistor and capacitor. That is, when the battery cell circuit 110 includes N battery cells, the resistor-capacitor circuit 120 includes N resistor-capacitor branches 1201, and the N resistor-capacitor branches 1201 are connected in series in sequence to limit current and filter the electrical energy provided by the N battery cells.

[0028] In an embodiment, as Figure 3 shown, when the resistor-capacitor circuit 120 includes one resistor-capacitor branch 1201, the first end of the resistor in the resistor-capacitor branch 1201 is connected to the positive electrode of the battery cell in the battery cell circuit 110, the second end of the resistor in the resistor-capacitor branch 1201 is respectively connected to the first end of the capacitor in the resistor-capacitor branch 1201 and the power supply terminals of the respective protection circuits 130, and the second end of the capacitor in the resistor-capacitor branch 1201 is respectively connected to the negative electrode of the battery cell in the battery cell circuit 110 and the grounding terminals of the respective protection circuits 130.

[0029] Specifically, when the resistive-capacitive circuit 120 includes only one resistive-capacitive branch 1201, the resistive-capacitive branch 1201 includes a resistor and a capacitor connected in series. The first end of the resistor is the first end of the resistive-capacitive branch 1201, and the second end of the capacitor is the second end of the resistive-capacitive branch 1201. The first end of the resistive-capacitive branch 1201 is connected to the positive electrode of the battery cell, and the second end of the resistive-capacitive branch 1201 is connected to the negative electrode of the battery cell. The second end of the resistor in the resistive-capacitive branch 1201 is connected to the first end of the capacitor, and the second end of the resistor is also connected to the power supply terminals of the respective protection circuits 130. The second end of the capacitor is also connected to the ground terminals of the respective protection circuits 130, that is, the capacitor is connected between the power supply terminal and the ground terminal of each protection circuit 130, so as to enable multiple protection circuits 130 to share one resistor and one capacitor, without adding a resistor and a capacitor for each protection circuit 130 respectively, thereby reducing the number of resistor and capacitor chip attachments and saving the chip attachment cost of the battery protection board circuit.

[0030] In one embodiment, when the resistive-capacitive circuit 120 includes multiple resistive-capacitive branches 1201, each of the resistive-capacitive branches 1201 is sequentially connected in series between the positive and negative electrodes of the battery cell circuit 110. The first end of the resistor in the first resistive-capacitive branch 1201 is connected to the positive electrode of the battery cell circuit 110, and the second end of the resistor in the first resistive-capacitive branch 1201 is respectively connected to the first end of the capacitor in the first resistive-capacitive branch 1201 and the power supply terminals of the respective protection circuits 130. The second end of the capacitor in the first resistive-capacitive branch 1201 is respectively connected to the first end of the resistor in the adjacent resistive-capacitive branch 1201 and the ground terminals of the respective protection circuits 130. The second end of the capacitor in the last resistive-capacitive branch 1201 is connected to the negative electrode of the battery cell circuit 110 and the ground terminals of the respective protection circuits 130. The connection line between the resistor and the capacitor in each of the resistive-capacitive branches 1201 is also connected to the power supply terminals of the respective protection circuits 130.

[0031] Specifically, as Figure 4 shown, when the battery cell circuit 110 includes multiple battery cells, the resistive-capacitive circuit 120 includes the same number of resistive-capacitive branches 1201. Each of the resistive-capacitive branches 1201 is sequentially connected in series. The connection point between the resistor and the capacitor in each resistive-capacitive branch 1201 is connected to the power supply terminals of the respective protection circuits 130. The second end of the capacitor in each resistive-capacitive branch 1201 is respectively connected to the first end of the resistor in the adjacent resistive-capacitive branch 1201 and the ground terminals of the respective protection circuits 130, so as to enable each protection circuit 130 to share all the resistors and capacitors in the resistive-capacitive circuit 120 corresponding to multiple battery cells, without adding the resistive-capacitive branches 1201 corresponding to the number of multiple battery cells for each protection circuit 130 respectively, thereby reducing the number of resistor and capacitor chip attachments and saving the chip attachment cost of the battery protection board circuit.

[0032] In one embodiment, the protection circuit 130 includes a protection chip and a switch tube circuit that are electrically connected. The power supply terminal of the protection chip is connected to the connection line between the resistor and the capacitor in each of the resistor-capacitor branches 1201. The ground terminal of the protection chip is connected to the second end of the capacitor in each of the resistor-capacitor branches 1201. The switch tube circuits in each of the protection circuits are connected in series, and the switch tube circuit in the first protection circuit is connected to the negative electrode of the battery cell circuit 110.

[0033] Specifically, referring to Figure 3 U1 and U2 in are protection chips in different protection circuits 130. The switch tube circuit is used to control the power supply state of the power supply according to the abnormal conditions of the battery (such as overcharge, over-discharge, over-current, over-voltage, short circuit, etc.), that is, to cut off the power supply when the battery is in an abnormal condition to prevent the battery from being damaged. The power supply terminal of the protection chip in the protection circuit 130 is connected to the connection line between the resistor and the capacitor in each of the resistor-capacitor branches 1201, and the ground terminal of the protection chip is connected to the second end of the capacitor in each of the resistor-capacitor branches 1201, so as to realize that the protection chips in each of the protection circuits 130 share all the capacitors and resistors in the resistor-capacitor circuit 120, and there is no need to add resistor-capacitor branches 1201 corresponding to the number of battery cells for each protection circuit 130 respectively, thereby reducing the number of resistor and capacitor patches and saving the patch cost of the battery protection board circuit.

[0034] In one embodiment, the switch tube circuit in the first protection circuit 130 is connected to the negative electrode of the battery cell circuit 110 through a sampling resistor.

[0035] Specifically, referring to Figure 3 RS1 in is the sampling resistor, also known as the precision resistor, which is used for current sampling. The current collected through the sampling resistor can be used to determine whether the battery is in an abnormal state.

[0036] In one embodiment, the switch tube circuit includes a protection switch tube and a protection capacitor. The first end of the protection switch tube is connected to the data storage terminal of the protection chip in the protection circuit 130 to which it belongs. The second end of the protection switch tube is connected to the carry terminal of the protection chip in the protection circuit 130 to which it belongs. The third end of the protection switch tube is connected to the connection terminal of the protection chip in the protection circuit 130 to which it belongs through a connection resistor. The third end of the protection switch tube is also connected to the first end of the protection switch tube in the next adjacent protection circuit 130. The fourth end of the protection switch tube in the first protection circuit is connected to the negative electrode of the battery cell circuit 110 through the sampling resistor. The fourth end of the protection switch tube in the non-first protection circuit 130 is connected to the third end of the protection switch tube in the previous adjacent protection circuit 130.

[0037] Specifically, as shown in Figure 3As shown, C3 and C4 are protection switching transistors in different protection circuits 130, and R2 and R3 are connection resistors in different protection circuits 130. Each switching transistor circuit includes a protection switching transistor and a protection capacitor. The third terminal of the protection switching transistor includes four pins 3, 4, 9, and 10, and the fourth terminal of the protection switching transistor includes four pins 1, 2, 7, and 8. The protection capacitor is connected between the third terminal and the fourth terminal of the protection switching transistor to play a filtering role. The on-off state of the protection switching transistor is used to determine the on-off state between the battery cell and the power supply, and is used to disconnect the connection between the battery cell and the power supply in case of battery abnormalities, so as to achieve protection against overcharging, over-discharging, over-current, over-voltage, short circuit, high temperature, etc. of the battery.

[0038] In one embodiment, the protection switching transistor includes a first field-effect transistor and a second field-effect transistor. The gate of the first field-effect transistor serves as the first terminal of the protection switching transistor. The drain of the first field-effect transistor is connected to the source of the second field-effect transistor. The source of the first field-effect transistor serves as the fourth terminal of the protection switching transistor. The gate of the second field-effect transistor serves as the second terminal of the protection switching transistor. The drain of the second field-effect transistor serves as the third terminal of the protection switching transistor.

[0039] Specifically, referring to Figure 3 , in the case where there are multiple protection circuits 130, the third terminals of the protection switching transistors in each protection circuit 130 are connected to the fourth terminals of the protection switching transistors in the adjacent protection circuit 130 behind, and multiple protection switching transistors are connected in series in sequence. Specifically, two MOS field-effect transistors are used to implement the protection switching transistor. Each diode is connected between the source and the drain of a MOS field-effect transistor. The gates of the two MOS field-effect transistors are respectively connected to the data storage terminal and the carry terminal of the protection chip. The source of the first field-effect transistor serves as the fourth terminal of the protection switching transistor, and the drain of the first field-effect transistor is connected to the source of the second field-effect transistor. The drain of the second field-effect transistor serves as the third terminal of the protection switching transistor.

[0040] In one embodiment, a battery is provided. The battery includes at least one battery cell and the battery protection board circuit described in any one of the above embodiments. The number of battery cells is the same as the number of resistor-capacitor branches in the resistor-capacitor circuit in the battery protection board circuit.

[0041] In one embodiment, an electronic device is provided. The electronic device includes at least the battery described in the previous embodiment.

[0042] Those skilled in the art can understand that Figures 1 - 4 the structure shown in is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0043] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The battery protection board circuit steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative...

[0044] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A battery protection board circuit, characterized in that: The battery protection board circuit includes a resistor-capacitor circuit and multiple protection circuits. The resistor-capacitor circuit is connected between the positive and negative electrodes of the battery cell circuit. Each of the protection circuits is connected to the resistor-capacitor circuit and the negative electrode of the battery cell circuit.

2. The battery protection board circuit according to claim 1, characterized in that: The number of cells in the cell circuit is the same as the number of resistor-capacitor branches in the resistor-capacitor circuit.

3. The battery protection board circuit according to claim 2, characterized in that: When the RC circuit includes a RC branch, the first end of the resistor in the RC branch is connected to the positive electrode of the battery cell in the battery cell circuit, the second end of the resistor in the RC branch is respectively connected to the first end of the capacitor in the RC branch and the power supply end of each protection circuit, and the second end of the capacitor in the RC branch is respectively connected to the negative electrode of the battery cell in the battery cell circuit and the ground end of each protection circuit.

4. The battery protection board circuit according to claim 2, characterized in that: When the RC circuit includes multiple RC branches, each of the RC branches is connected in series between the positive and negative electrodes of the battery cell circuit in sequence, the first end of the resistor in the first RC branch is connected to the positive electrode of the battery cell circuit, the second end of the resistor in the first RC branch is respectively connected to the first end of the capacitor in the first RC branch and the power supply end of each protection circuit, the second end of the capacitor in the first RC branch is respectively connected to the first end of the resistor in the adjacent RC branch and the ground end of each protection circuit, the second end of the capacitor in the last RC branch is connected to the negative electrode of the battery cell circuit and the ground end of each protection circuit, and the connecting line between the resistor and capacitor in each RC branch is also connected to the power supply end of each protection circuit.

5. The battery protection board circuit according to claim 4, characterized in that: The protection circuit includes an electrically connected protection chip and a switch tube circuit, the power supply end of the protection chip is connected to the connecting line between the resistor and the capacitor in each of the RC branches, the ground end of the protection chip is connected to the second end of the capacitor in each of the RC branches, the switch tube circuits in each of the protection circuits are connected in series, and the switch tube circuit in the first protection circuit is connected to the negative pole of the battery cell circuit.

6. The battery protection board circuit according to claim 5, characterized in that: The switch tube circuit in the first protection circuit is connected to the negative electrode of the battery cell circuit through a sampling resistor.

7. The battery protection board circuit according to claim 6, characterized in that: The switch tube circuit includes a protection switch tube and a protection capacitor. The first end of the protection switch tube is connected to the data storage end of the protection chip in the protection circuit, the second end of the protection switch tube is connected to the carry end of the protection chip in the protection circuit, the third end of the protection switch tube is connected to the connection end of the protection chip in the protection circuit through a connecting resistor, the third end of the protection switch tube is also connected to the first end of the protection switch tube in the next adjacent protection circuit, the fourth end of the protection switch tube in the first protection circuit is connected to the negative pole of the battery circuit through the sampling resistor, and the fourth end of the protection switch tube in the non-first protection circuit is connected to the third end of the protection switch tube in the previous adjacent protection circuit.

8. The battery protection board circuit according to claim 7, characterized in that: The protection switch tube includes a first field effect tube and a second field effect tube, the gate of the first field effect tube serves as the first end of the protection switch tube, the drain of the first field effect tube is connected to the source of the second field effect tube, the source of the first field effect tube serves as the fourth end of the protection switch tube, the gate of the second field effect tube serves as the second end of the protection switch tube, and the drain of the second field effect tube serves as the third end of the protection switch tube.

9. A battery, characterized in that: The battery comprises a battery cell and a battery panel protection circuit as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: The electronic device comprises the battery as claimed in claim 9.

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