Battery protection chip and battery

Abstract

The utility model discloses a battery protection chip and a battery, the battery protection chip comprises a control logic circuit and a plurality of overcharge detection circuits, each overcharge detection circuit is electrically connected with the control logic circuit, and the overcharge protection voltages corresponding to the overcharge detection circuits are different.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery protection chip and a battery. Background Art

[0002] Lithium batteries are widely used in various electronic devices due to their high energy density, long service life, high rated voltage, and environmental protection. In order to avoid overcharging or overdischarging of lithium batteries during use, which may lead to safety hazards, a battery protection chip is usually required to ensure the safety of battery use.

[0003] However, the overcharge protection voltage in the current battery protection chip is a fixed value. As long as the voltage system of the lithium battery is adjusted, the corresponding battery protection chip needs to be adjusted accordingly, and the battery protection chip has the problem of poor compatibility. Utility Model Content

[0004] The present application discloses a battery protection chip and a battery, which can improve the compatibility of the battery protection chip.

[0005] In a first aspect, an embodiment of the present application discloses a battery protection chip, comprising: a control logic circuit and multiple overcharge detection circuits, wherein: each of the overcharge detection circuits is electrically connected to the control logic circuit, respectively, and each of the overcharge detection circuits corresponds to a different overcharge protection voltage.

[0006] In a second aspect, an embodiment of the present application discloses a battery, comprising a battery cell and the battery protection chip described in the first aspect, wherein the battery cell is electrically connected to the battery protection chip.

[0007] An embodiment of the present application provides a battery protection chip, which includes a control logic circuit and multiple overcharge detection circuits, each of which is electrically connected to the control logic circuit. Since each overcharge detection circuit corresponds to a different overcharge protection voltage, the battery protection chip is compatible with multiple overcharge protection voltages, thereby improving the compatibility of the battery protection chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of the structure of a battery protection chip disclosed in an embodiment of the present application;

[0009] Figure 2 A schematic diagram of the structure of a battery protection chip disclosed in an embodiment of the present application;

[0010] Figure 3 A schematic diagram of the structure of a battery protection chip disclosed in an embodiment of the present application;

[0011] Figure 4 A schematic diagram of the structure of a battery disclosed in an embodiment of the present application;

[0012] Figure 5 A schematic diagram of the structure of a battery disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0014] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0015] The present application discloses a battery protection chip and a battery. Figure 1 A schematic diagram of the structure of a battery protection chip disclosed in an embodiment of the present application.

[0016] like Figure 1 As shown, the battery protection chip disclosed in the present application includes: a control logic circuit 110 and multiple overcharge detection circuits 120, wherein: each of the overcharge detection circuits 120 is electrically connected to the control logic circuit 110, and each of the overcharge detection circuits 120 corresponds to a different overcharge protection voltage.

[0017] In the present application, the control logic circuit 110 determines whether to disconnect the charging of the battery cell according to the signal sent by the overcharge detection circuit 120 .

[0018] Since the overcharge protection voltages corresponding to the respective overcharge detection circuits 120 in the plurality of overcharge detection circuits 120 are different, the battery protection chip disclosed in the present application is compatible with a variety of overcharge protection voltages, and thus the battery protection chip disclosed in the present application is compatible with more battery cell voltage systems.

[0019] An embodiment of the present application provides a battery protection chip, which includes a control logic circuit 110 and multiple overcharge detection circuits 120. Each overcharge detection circuit 120 is electrically connected to the control logic circuit 110. Since each overcharge detection circuit 120 corresponds to a different overcharge protection voltage, the battery protection chip is compatible with multiple overcharge protection voltages, thereby improving the compatibility of the battery protection chip.

[0020] In one implementation, Figure 2 As shown, the overcharge detection circuit 120 may include a comparator, a voltage source, a first resistor and a second resistor, wherein: the first end of the first resistor is electrically connected to the battery cell voltage detection pin, the second end of the first resistor is electrically connected to the first end of the second resistor; the second end of the second resistor is electrically connected to the ground; the first input end of the comparator is electrically connected to the second end of the first resistor, the second input end of the comparator is electrically connected to the positive electrode of the voltage source, the negative electrode of the voltage source is electrically connected to the ground, and the output end of the comparator is electrically connected to the control logic circuit 110.

[0021] In the present application, the first input terminal of the comparator is the positive input terminal of the comparator, and the second input terminal of the comparator is the negative input terminal of the comparator.

[0022] In this embodiment, the voltage sources in the overcharge detection circuits 120 provide different voltage values. That is, by setting the voltage sources in the overcharge detection circuits 120 to provide different voltage values, the overcharge protection voltages corresponding to the overcharge detection circuits 120 are different.

[0023] It should be noted that, in the present application, the first resistor and the second resistor play a voltage dividing role, dividing the voltage input to the battery cell voltage detection pin, and the sum of the voltages across the first resistor and the second resistor is equal to the voltage input to the battery cell voltage detection pin. In addition, the specific specifications of the first resistor and the second resistor in each overcharge detection circuit 120 can also be adjusted according to actual needs.

[0024] In the present application, the cell voltage detection pins correspond to the overcharge detection circuits 120 one by one. The second end of the second resistor in each of the overcharge detection circuits 120 is electrically connected to a common ground pin. Figure 2As shown, the multiple overcharge detection circuits include a first overcharge detection circuit 120, a second overcharge detection circuit 120 and a third overcharge detection circuit 120, the first end of the first resistor R2 in the first overcharge detection circuit 120 is electrically connected to the first battery cell voltage detection pin VDD1, the second end of the second resistor R1 is electrically connected to the common ground pin VSS, the first end of the first resistor R4 in the second overcharge detection circuit 120 is electrically connected to the second battery cell voltage detection pin VDD2, the second end of the second resistor R3 is electrically connected to the common ground pin VSS, the first end of the first resistor R5 in the third overcharge detection circuit 120 is electrically connected to the third battery cell voltage detection pin VDD3, and the second end of the second resistor R6 is electrically connected to the common ground pin VSS, that is, VDD1, VDD2, and VDD3 correspond to an overcharge protection voltage respectively, that is, by using the battery protection chip disclosed in the embodiment of the present application, the required battery cell voltage detection pin can be selected according to actual needs during actual use, and then the required overcharge detection circuit and the corresponding overcharge protection voltage can be selected.

[0025] Exemplarily, when the first battery cell voltage detection pin VDD1 is selected, the voltage input to the VDD1 pin is the voltage divided Vin in the first overcharge detection circuit 120 = VDD*R2 / (R1+R2). When the comparator in the first overcharge detection circuit 120 determines that Vin is greater than or equal to the voltage provided by the voltage source V1, and the corresponding delay satisfies the preset value, the control logic circuit 110 controls the pin CO of the battery protection chip to control the charging MOS to be closed, and the battery protection chip enters overcharge protection. It should be noted that the working conditions of selecting other battery cell voltage detection pins are similar to the working conditions of selecting the first battery cell voltage detection pin VDD1, and this application will not go into details here. It should be noted that the preset value corresponding to the delay can be set according to actual needs, and this application does not make specific limitations on this.

[0026] It should be noted that the multiple overcharge detection circuits described above include a first overcharge detection circuit, a second overcharge detection circuit and a third overcharge detection circuit, which is only an example. The multiple overcharge detection circuits may also include two overcharge detection circuits, four overcharge detection circuits or a larger number of overcharge detection circuits. The specific number can be set according to actual needs, and this application does not make any specific limitation on this.

[0027] In another implementation, Figure 3As shown, the multiple overcharge detection circuits 120 include a first resistor R2, a second resistor R1, multiple comparators and multiple voltage sources, wherein: the first end of the first resistor R2 is electrically connected to the battery cell voltage detection pin VDD, the second end of the first resistor R2 is electrically connected to the first end of the second resistor R1; the second end of the second resistor R1 is electrically connected to the ground; the first input end of each of the comparators is electrically connected to the second end of the first resistor R2, the second input end of each of the comparators is electrically connected to the positive electrode of one of the voltage sources, the negative electrode of each of the voltage sources is electrically connected to the ground, and the output end of each of the comparators is electrically connected to the control logic circuit 110.

[0028] In the present application, the first input terminal of each comparator is the positive input terminal of the comparator, and the second input terminal of each comparator is the negative input terminal of the comparator. The second end of the second resistor R1 is electrically connected to the common ground pin VSS, and the negative electrode of each voltage source is electrically connected to the common ground pin VSS.

[0029] In this embodiment, the voltage values ​​provided by the voltage sources are different. The overcharge detection circuit 120 corresponds to the comparator one-to-one, and the comparator corresponds to the voltage source one-to-one. In other words, by setting the voltage values ​​provided by the voltage sources connected to the comparators to be different, the battery protection chip can be compatible with multiple overcharge protection voltages.

[0030] For example, Figure 3As shown, the multiple overcharge detection circuits 120 include a first resistor R2, a second resistor R1, a first comparator COM1, a second comparator COM2, a third comparator COM3, a first voltage source V1, a second voltage source V2 and a third voltage source V3. The voltage provided by the first voltage source V1 is Vov1, the voltage provided by the second voltage source V2 is Vov2, and the voltage provided by the third voltage source V3 is Vov3, Vov1<Vov2<Vov3. In addition, the detection delay corresponding to the output signal of the first comparator COM1 preset in the control logic circuit 110 is Tov1, the detection delay corresponding to the output signal of the second comparator COM2 is Tov2, and the detection delay corresponding to the output signal of the third comparator COM3 is Tov3, Tov1>Tov2>Tov3. The first resistor R2 and the second resistor R1 play a voltage dividing role. The voltage input between VDD and VSS is the divided voltage Vin=VDD*R2 / (R1+R2) of the overcharge detection circuit. When Vin≥Vov1 and the delay≥Tov1, The overcharge protection voltage of overcharge 1 corresponding to the first comparator COM1 is triggered, and the control logic circuit 110 controls the pin CO of the control charging MOS of the battery protection chip to be closed, and the battery protection chip enters the overcharge 1 protection. When Vin≥Vov2 and the delay≥Tov2, the overcharge protection voltage of overcharge 2 corresponding to the second comparator COM2 is triggered, and the control logic circuit 110 controls the pin CO of the control charging MOS of the battery protection chip to be closed, and the battery protection chip enters the overcharge 2 protection. Because Vov1<Vov2 and Tov1>Tov2, the battery protection chip gives priority to overcharge 2 protection. When Vin≥Vov3 and the delay≥Tov3, the overcharge protection voltage of overcharge 3 corresponding to the third comparator COM3 is triggered, and the control logic circuit 110 controls the pin CO of the control charging MOS of the battery protection chip to be closed, and the battery protection chip enters the overcharge 3 protection. Because Vov1<Vov2<Vov3 and Tov1>Tov2>Tov3, the battery protection chip gives priority to overcharge 3 protection.

[0031] It should be noted that after the battery protection chip enters any overcharge protection voltage, the overcharge detection function is stopped before the overcharge is recovered, that is, the battery protection chip only performs one overcharge detection function each time.

[0032] It should be noted that the multiple overcharge detection circuits described above including three comparators and three voltage sources are only an example. The multiple overcharge detection circuits may also include two comparators and two voltage sources, four comparators and four voltage sources, etc. The specific number can be set according to actual needs, and this application does not make any specific limitation on this.

[0033] It should be noted that the voltage source mentioned above in the present application is an electronic component arranged in the battery protection chip and capable of directly providing a corresponding voltage.

[0034] Exemplarily, for the dual battery protection chip solution, when the battery cell voltage systems include 6 types (for example, 4.43V, 4.45V, 4.48V, 4.50V, 4.53V, and 4.60V) and the battery protection chip brands include 4 types, if the solution in the related art is adopted, as long as the voltage system of the lithium battery is adjusted, 6*4*2=48 new battery protection chips need to be opened. However, by adopting the solution of multiple overcharge detection circuits including three overcharge detection circuits disclosed in the present application, only 2*4*2=16 new battery protection chips need to be opened, which can reduce the number of new battery protection chips.

[0035] An embodiment of the present application further discloses a battery, comprising a battery cell and the battery protection chip described above, wherein the battery cell is electrically connected to the battery protection chip.

[0036] If the overcharge detection circuit 120 includes a comparator, a voltage source, a first resistor and a second resistor, wherein: the first end of the first resistor is electrically connected to the battery cell voltage detection pin, the second end of the first resistor is electrically connected to the first end of the second resistor; the second end of the second resistor is electrically connected to the ground; the first input end of the comparator is electrically connected to the second end of the first resistor, the second input end of the comparator is electrically connected to the positive electrode of the voltage source, the negative electrode of the voltage source is electrically connected to the ground, and the output end of the comparator is electrically connected to the control logic circuit 110, then the connection relationship between the battery cell CELL and the battery protection chip IC is as follows: Figure 4 Specifically, each cell voltage detection pin of the battery protection chip IC is electrically connected to the positive electrode of the cell CELL through a resistor, each cell voltage detection pin is electrically connected to the ground through a capacitor, the common ground pin VSS of the battery protection chip IC is electrically connected to the ground, and the pin CO of the battery protection chip IC's charge control MOS is connected to a MOS tube. It should be noted that Figure 4 The P+ in the figure represents the positive pole of the charging interface, and the P- represents the negative pole of the charging interface.

[0037] in addition, Figure 4 The single IC protection circuit shown in the figure can be further derived into a dual IC protection circuit. The dual IC protection circuit can be specifically two Figure 4 The cell CELL shown is partially connected in series with the capacitor C2.

[0038] If the multiple overcharge detection circuits 120 include a first resistor, a second resistor, multiple comparators and multiple voltage sources, wherein: the first end of the first resistor is electrically connected to the battery cell voltage detection pin, the second end of the first resistor is electrically connected to the first end of the second resistor; the second end of the second resistor is electrically connected to the ground; the first input end of each comparator is electrically connected to the second end of the first resistor, the second input end of each comparator is electrically connected to the positive electrode of one of the voltage sources, the negative electrode of each voltage source is electrically connected to the ground, and the output end of each comparator is electrically connected to the control logic circuit 110, then the connection relationship between the battery cell CELL and the battery protection chip IC is as follows: Figure 5 Specifically, a first end of a resistor is electrically connected to the positive electrode of the cell CELL, a second end of the resistor is electrically connected to a first end of a capacitor, a second end of the capacitor is electrically connected to the negative electrode of the cell CELL, a cell voltage detection pin VDD of a battery protection chip IC is electrically connected to the first end of the capacitor, a common ground pin VSS of the battery protection chip IC is electrically connected to the negative electrode of the cell CELL, and a pin CO of a charge control MOS of the battery protection chip IC is connected to a MOS tube. It should be noted that Figure 5 The P+ in the figure represents the positive pole of the charging interface, and the P- represents the negative pole of the charging interface.

[0039] in addition, Figure 5 The single IC protection circuit shown in the figure can be further derived into a dual IC protection circuit. The dual IC protection circuit can be specifically two Figure 5 The cell CELL shown is partially connected in series with the capacitor C2.

[0040] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0041] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A battery protection chip, characterized in that: include: Control logic circuit and multiple overcharge detection circuits, where: Each of the overcharge detection circuits is electrically connected to the control logic circuit, and each of the overcharge detection circuits corresponds to a different overcharge protection voltage.

2. The battery protection chip according to claim 1, characterized in that: The overcharge detection circuit comprises a comparator, a voltage source, a first resistor and a second resistor, wherein: The first end of the first resistor is electrically connected to the cell voltage detection pin, and the second end of the first resistor is electrically connected to the first end of the second resistor; The second end of the second resistor is electrically connected to the ground; The first input terminal of the comparator is electrically connected to the second end of the first resistor, the second input terminal of the comparator is electrically connected to the positive electrode of the voltage source, the negative electrode of the voltage source is electrically connected to the ground, and the output terminal of the comparator is electrically connected to the control logic circuit.

3. The battery protection chip according to claim 2, characterized in that: The voltage values ​​provided by the voltage sources in the respective overcharge detection circuits are different.

4. The battery protection chip according to claim 2, characterized in that: The cell voltage detection pins correspond one to one with the overcharge detection circuit.

5. The battery protection chip according to claim 2, characterized in that: The second end of the second resistor in each of the overcharge detection circuits is electrically connected to a common ground pin.

6. The battery protection chip according to claim 2, characterized in that: The first input terminal of the comparator is the positive input terminal of the comparator, and the second input terminal of the comparator is the negative input terminal of the comparator.

7. The battery protection chip according to claim 1, characterized in that: The multiple overcharge detection circuits include a first resistor, a second resistor, a plurality of comparators and a plurality of voltage sources, wherein: The first end of the first resistor is electrically connected to the cell voltage detection pin, and the second end of the first resistor is electrically connected to the first end of the second resistor; The second end of the second resistor is electrically connected to the ground; The first input terminal of each comparator is electrically connected to the second end of the first resistor, the second input terminal of each comparator is electrically connected to the positive electrode of a voltage source, the negative electrode of each voltage source is electrically connected to the ground, and the output terminal of each comparator is electrically connected to the control logic circuit.

8. The battery protection chip according to claim 7, characterized in that: The voltage values ​​provided by the voltage sources are different.

9. The battery protection chip according to claim 7, characterized in that: The second end of the second resistor is electrically connected to a common ground pin, and the negative electrode of each of the voltage sources is electrically connected to the common ground pin.

10. A battery, characterized in that: It comprises a battery cell and the battery protection chip according to any one of claims 1 to 9, wherein the battery cell is electrically connected to the battery protection chip.

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