Discharge control circuit, battery management chip, system and module

Abstract

The invention discloses a discharge control circuit, a battery management chip, a system and a module, and the discharge control circuit comprises a first voltage conversion module which provides a first output voltage to a load connection end; the load detection module is used for driving the first voltage conversion module to enter a non-working state and the second voltage conversion module to enter a working state when the load current output by the load connection end is smaller than a preset current threshold value; the second voltage conversion module is used for providing a target voltage to the load connection end and driving the first voltage conversion module to enter a working state when the load connection end is connected to a load device. According to the technical scheme, when the load connecting end is connected to the load equipment through the second voltage conversion module, the target voltage is provided for compensating the discharge voltage of the load connecting end, the discharge voltage is prevented from dropping, the large-current discharge requirement is met through the first voltage conversion module, and therefore low power consumption is guaranteed, and meanwhile the service life is prolonged. Discharge voltage drop when the load connection end is connected to load equipment is prevented.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a discharge control circuit, a battery management chip, a system and a module. Background Art

[0002] With the advancement of technology, the reduction of lithium battery costs and the enhancement of environmental awareness, people's demand for rechargeable lithium batteries is increasing. In this context, lithium batteries are increasingly being used to replace traditional dry batteries. However, traditional dry batteries are mostly used in electronic products such as remote controls, electronic calculators, and electric vehicles. A notable feature of these products is that they are used occasionally and have high static power consumption requirements.

[0003] The existing lithium battery to dry battery PMIC (power management integrated circuit) chip meets the market demand to a certain extent, but it still has certain technical defects. Specifically, it manifests in the following aspects: When working in no-load discharge mode, the static power consumption of the existing PMIC chip is relatively large, usually greater than 10uA. This leads to high energy consumption of the product in standby mode, affecting the product's endurance. When working in discharge mode, when a transient jump occurs at the load end (such as jumping from no-load to full load), the output voltage will drop significantly, affecting the normal use of the product. Summary of the invention

[0004] The embodiments of the present invention provide a discharge control circuit, a battery management chip, a system and a module to solve the problem that the static power consumption of the existing discharge control circuit is large and the output voltage drops greatly when the load changes.

[0005] A discharge control circuit comprises a first voltage conversion module, a load detection module and a second voltage conversion module; The first voltage conversion module is used to connect the battery and the load connection terminal, and to provide a first output voltage to the load connection terminal; The load detection module is connected to the first voltage conversion module and the second voltage conversion module, and is used to drive the first voltage conversion module into a non-working state and drive the second voltage conversion module into a working state when the load current output by the load connection end is less than a preset current threshold; The second voltage conversion module is connected to the first voltage conversion module, and is used to connect the battery and the load connection terminal, and is used to provide a target voltage to the load connection terminal when the load connection terminal is connected to a load device, and drive the first voltage conversion module to enter a working state.

[0006] Further, the second voltage conversion module includes a voltage comparison module and a logic output module; The voltage comparison module is connected to the load detection module, the load connection terminal and the first voltage conversion module, and is used to output a first comparison signal when the measured voltage output from the load connection terminal is less than a first voltage threshold; output a second comparison signal when the measured voltage is less than a second voltage threshold; the second voltage threshold is less than the first voltage threshold; the second comparison signal is used to drive the second voltage conversion module to enter a working state; The logic output module is connected to the voltage comparison module and the load connection terminal, and is used to provide a target voltage to the load connection terminal according to the first comparison signal or the second comparison signal.

[0007] Further, the difference between the second voltage threshold and the first voltage threshold ranges from 95 mV to 105 mV.

[0008] Furthermore, the second voltage conversion module also includes a reference voltage module, which is connected to the voltage comparison module and is used to provide a first reference voltage corresponding to the first voltage threshold and a second reference voltage corresponding to the second voltage threshold to the voltage comparison module.

[0009] Further, the voltage comparison module includes a first comparator and a second comparator; The first input terminal of the first comparator is connected to the reference voltage module, the second input terminal of the first comparator is connected to the load connection terminal, the enable terminal of the first comparator is connected to the load detection module, and the output terminal of the first comparator is connected to the logic output module; The first input terminal of the second comparator is connected to the reference voltage module, the second input terminal of the second comparator is connected to the load connection terminal, the enable terminal of the second comparator is connected to the output terminal of the first comparator, and the output terminal of the second comparator is connected to the logic output module and the first voltage conversion module.

[0010] Furthermore, the first voltage conversion module includes a Buck module; and the second voltage conversion module includes an LDO module.

[0011] A battery management chip comprises the above-mentioned discharge control circuit.

[0012] Furthermore, the battery management chip also includes a charging control circuit; the charging control circuit is used to connect the battery and the load connection terminal, and is used to control the charging of the battery.

[0013] A battery management system comprises a battery and the above-mentioned battery management chip; the battery is connected to the battery management chip.

[0014] A battery module comprises the above-mentioned battery management system.

[0015] The above-mentioned discharge control circuit, battery management chip, system and module, the discharge control circuit includes a first voltage conversion module, a load detection module and a second voltage conversion module; the first voltage conversion module is used to connect the battery and the load connection terminal, and is used to provide a first output voltage to the load connection terminal; the load detection module is connected to the first voltage conversion module and the second voltage conversion module, and is used to drive the first voltage conversion module into a non-working state and drive the second voltage conversion module into a working state when the load current output from the load connection terminal is less than a preset current threshold; the second voltage conversion module is connected to the first voltage conversion module, and is used to connect the battery and the load connection terminal, and is used to provide a target voltage to the load connection terminal when the load connection terminal is connected to a load device, and drive the first voltage conversion module into a working state, so that when the load connection terminal is connected to the load device, the second voltage conversion module provides a target voltage to compensate for the discharge voltage of the load connection terminal, prevent the discharge voltage from dropping, and drive the first voltage conversion module into a working state at the same time, so as to meet the large current discharge demand through the first voltage conversion module, thereby ensuring low power consumption while preventing the discharge voltage from dropping when the load connection terminal is connected to the load device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0017] Figure 1 is a circuit diagram of a battery management system in one embodiment of the present invention; Figure 2 FIG. 4 is another circuit diagram of a battery management system according to an embodiment of the present invention.

[0018] In the figure: 1. battery; 2. battery management chip; 21. discharge control circuit; 211. first voltage conversion module; 212. load detection module; 213. second voltage conversion module; 2131. voltage comparison module; 213a. first comparator; 213b. second comparator; 2132. logic output module; 2133. reference voltage module; 22. charging control circuit. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0021] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0022] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0023] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0024] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0025] The present embodiment provides a discharge control circuit 21, which is applied in a battery management chip 2. Exemplarily, the battery management chip 2 may be a charge and discharge management chip. The battery management chip 2 also includes a charging control circuit 22; the charging control circuit 22 is used to connect the battery 1 and the load connection terminal, and is used to control the charging of the battery 1. As an example, during charging, the charger is connected to the load connection terminal, and the battery 1 is charged through the charging control circuit 22. When the load connection terminal is floating or the charger is not connected, the battery 1 modulates the output voltage of the load connection terminal to a preset output voltage, such as 1.5V, through the discharge control circuit 21, to simulate the discharge of a dry cell. Among them, the battery 1 may be a lithium battery.

[0026] The present embodiment provides a discharge control circuit 21, comprising a first voltage conversion module 211, a load detection module 212 and a second voltage conversion module 213; the first voltage conversion module 211 is used to connect the battery 1 and the load connection terminal, and is used to provide a first output voltage to the load connection terminal; the load detection module 212 is connected to the first voltage conversion module 211 and the second voltage conversion module 213, and is used to drive the first voltage conversion module 211 into a non-working state and drive the second voltage conversion module 213 into a working state when the load current output from the load connection terminal is less than a preset current threshold; the second voltage conversion module 213 is connected to the first voltage conversion module 211, and is used to connect the battery 1 and the load connection terminal, and is used to provide a target voltage to the load connection terminal when the load connection terminal is connected to a load device, and drive the first voltage conversion module 211 into a working state.

[0027] Among them, the first voltage conversion module 211 and the second voltage conversion module 213 are both used to convert the battery voltage output by the battery 1, and output a discharge voltage for simulating the discharge of a dry cell. For example, 1.5V. The power consumption of the first voltage conversion module 211 and the second voltage conversion module 213 are different. The power consumption of the first voltage conversion module 211 is greater than the power consumption of the second voltage conversion module 213. Therefore, when the load is empty, the second voltage conversion module 213 is used to discharge, thereby reducing the static power consumption. When the load is full, the first voltage conversion module 211 is used to discharge to meet the large current discharge demand.

[0028] As an example, the first voltage conversion module 211 is used to connect the battery 1 and the load connection terminal, and to provide a first output voltage to the load connection terminal. In this example, the first voltage conversion module 211 performs a discharge operation based on the battery 1 as a power source.

[0029] As an example, the load detection module 212 is connected to the first voltage conversion module 211 and the second voltage conversion module 213, and is used to drive the first voltage conversion module 211 into a non-working state and drive the second voltage conversion module 213 into a working state when the load current output from the load connection end is less than a preset current threshold. Among them, the preset current threshold is a pre-set current threshold, which is used to determine whether it is unloaded, and can be set according to actual experience, and is not limited here. In this example, when the load current output from the load connection end is less than the preset current threshold, the load detection module 212 determines that the load connection end is unloaded at this time, drives the first voltage conversion module 211 into a non-working state, and drives the second voltage conversion module 213 into a working state to reduce static power consumption.

[0030] As an example, the second voltage conversion module 213 is connected to the first voltage conversion module 211, and is used to connect the battery 1 and the load connection terminal, and is used to provide a target voltage to the load connection terminal when the load connection terminal is connected to the load device, and drive the first voltage conversion module 211 to enter the working state. In this example, the second voltage conversion module 213 can determine whether the load connection terminal is connected to the load device by detecting the measured voltage of the load connection terminal. When the load connection terminal is connected to the load device, the discharge operation is performed based on the battery 1 as a power source, and the target voltage is provided to the load connection terminal. Since the discharge voltage will drop when the load connection terminal is connected to the load device from no-load, the target voltage is used to maintain the discharge voltage of the load connection terminal to prevent the discharge voltage from dropping, and at the same time drive the first voltage conversion module 211 to enter the working state, so as to meet the large current discharge demand through the first voltage conversion module 211.

[0031] In this embodiment, the discharge control circuit 21 includes a first voltage conversion module 211, a load detection module 212, and a second voltage conversion module 213; the first voltage conversion module 211 is used to connect the battery 1 and the load connection terminal, and is used to provide a first output voltage to the load connection terminal; the load detection module 212 is connected to the first voltage conversion module 211 and the second voltage conversion module 213, and is used to drive the first voltage conversion module 211 into a non-working state and drive the second voltage conversion module 213 into a working state when the load current output from the load connection terminal is less than a preset current threshold; the second voltage conversion module 213 is connected to the first voltage conversion module 211 and the second voltage conversion module 213. The voltage conversion module 211 is connected to connect the battery 1 and the load connection terminal, and is used to provide a target voltage to the load connection terminal when the load connection terminal is connected to a load device, and drive the first voltage conversion module 211 to enter a working state, so that when the load connection terminal is connected to a load device, the second voltage conversion module 213 provides a target voltage to compensate for the discharge voltage of the load connection terminal to prevent the discharge voltage from dropping, and at the same time drives the first voltage conversion module 211 to enter a working state, so as to meet the large current discharge demand through the first voltage conversion module 211, thereby ensuring low power consumption while preventing the discharge voltage from dropping when the load connection terminal is connected to a load device.

[0032] In one embodiment, the second voltage conversion module 213 includes a voltage comparison module 2131 and a logic output module 2132; the voltage comparison module 2131 is connected to the load detection module 212, the load connection terminal and the first voltage conversion module 211, and is used to output a first comparison signal when the measured voltage output at the load connection terminal is less than the first voltage threshold; when the measured voltage is less than the second voltage threshold, output a second comparison signal; the second voltage threshold is less than the first voltage threshold; the second comparison signal is used to drive the second voltage conversion module 213 to enter a working state; the logic output module 2132 is connected to the voltage comparison module 2131 and the load connection terminal, and is used to provide a target voltage to the load connection terminal according to the first comparison signal or the second comparison signal.

[0033] The first voltage threshold and the second voltage threshold can be configured according to actual needs and are not limited here, as long as the second voltage threshold is smaller than the first voltage threshold.

[0034] As an example, when the measured voltage outputted from the load connection terminal is less than the first voltage threshold, the voltage comparison module 2131 outputs a first comparison signal, and through the first comparison signal, instructs the logic output module 2132 to provide a smaller target voltage to the load connection terminal. If the measured voltage does not increase, but continues to decrease, when the measured voltage is less than the second voltage threshold, the voltage comparison module 2131 outputs a second comparison signal, and through the second comparison signal, instructs the logic output module 2132 to provide a larger target voltage to the load connection terminal, and drives the second voltage conversion module 213 to enter the working state through the second comparison signal. It can be understood that when the load connection terminal is connected to the load device, the measured voltage, that is, the discharge voltage will decrease. Therefore, the decrease range of the measured voltage is judged through the first voltage threshold and the second voltage threshold, so as to determine whether the load connection terminal is connected to the load device. When the load device is connected, the target voltage is provided to the load connection terminal to prevent the measured voltage from dropping, and at the same time drive the second voltage conversion module 213 to enter the working state to ensure the large current discharge demand. Exemplarily, the logic output module 2132 includes a LDO (Low Dropout Regulator, LDO for short) module.

[0035] In one embodiment, the difference between the second voltage threshold and the first voltage threshold ranges from 95 mV to 105 mV. Preferably, the difference between the second voltage threshold and the first voltage threshold is 100 mV. In this example, the difference between the second voltage threshold and the first voltage threshold can be used to determine the drop in the measured voltage, thereby determining whether the load connection terminal is connected to the load device.

[0036] In one embodiment, the second voltage conversion module 213 further includes a reference voltage module 2133 , which is connected to the voltage comparison module 2131 and is configured to provide a first reference voltage corresponding to the first voltage threshold and a second reference voltage corresponding to the second voltage threshold to the voltage comparison module 2131 .

[0037] The reference voltage module 2133 may be a low-power voltage module, such as 100 nA, to reduce the overall power consumption of the discharge control circuit 21 .

[0038] In this embodiment, the second voltage conversion module 213 also includes a reference voltage module 2133, which is connected to the voltage comparison module 2131 and is used to provide a first reference voltage corresponding to the first voltage threshold and a second reference voltage corresponding to the second voltage threshold to the voltage comparison module 2131, thereby simultaneously providing a first reference voltage corresponding to the first voltage threshold and a second reference voltage corresponding to the second voltage threshold through one reference voltage module 2133, thereby reducing volume and cost.

[0039] In one embodiment, the voltage comparison module 2131 includes a first comparator 213a and a second comparator 213b; the first input end of the first comparator 213a is connected to the reference voltage module 2133, the second input end of the first comparator 213a is connected to the load connection end, the enable end of the first comparator 213a is connected to the load detection module 212, and the output end of the first comparator 213a is connected to the logic output module 2132; the first input end of the second comparator 213b is connected to the reference voltage module 2133, the second input end of the second comparator 213b is connected to the load connection end, the enable end of the second comparator 213b is connected to the output end of the first comparator 213a, and the output end of the second comparator 213b is connected to the logic output module 2132 and the first voltage conversion module 211.

[0040] Among them, the first comparator 213a is a low-power comparator. The second comparator 213b is a high-speed comparator. The power consumption of the first comparator 213a is greater than the power consumption of the second comparator 213b. In this embodiment, since the second comparator 213b is enabled only when the first comparator 213a outputs the first comparison signal, its enabling time is short, so the power consumption of the second comparator 213b can be ignored.

[0041] As an example, when the first comparator 213a detects that the measured voltage is less than the first reference voltage, it outputs a high-level signal to enable the second comparator 213b, and at the same time instructs the logic output module 2132 to supplement the measured voltage with a small amount of energy, forcing the measured voltage to increase. At this time, the second comparator 213b is enabled, and when the logic output module 2132 supplements the measured voltage with a small amount of energy, if the measured voltage does not increase, but is less than the second reference voltage, the second comparator 213b outputs a high-level signal to enable the first voltage conversion module 211 to enter the working state, and instructs the logic output module 2132 to supplement the measured voltage with a large amount of energy, forcing the measured voltage to increase, thereby preventing the discharge voltage from dropping when the load device is connected.

[0042] In this embodiment, the voltage comparison module 2131 includes a first comparator 213a and a second comparator 213b; a first input terminal of the first comparator 213a is connected to the reference voltage module 2133, a second input terminal of the first comparator 213a is connected to the load connection terminal, an enable terminal of the first comparator 213a is connected to the load detection module 212, and an output terminal of the first comparator 213a is connected to the logic output module 2132; a first input terminal of the second comparator 213b is connected to the reference voltage module 2133, a second input terminal of the second comparator 213b is connected to the load connection terminal, The load connection end is connected, the enable end of the second comparator 213b is connected to the output end of the first comparator 213a, and the output end of the second comparator 213b is connected to the logic output module 2132 and the first voltage conversion module 211, so that the first comparator 213a and the second comparator 213b are used to determine whether the load connection end is connected to the load device. When the load device is connected, the logic output module 2132 is instructed to output the target voltage to supplement the discharge voltage and prevent the discharge voltage from dropping, and at the same time drive the first voltage conversion module 211 to enter the working state to meet the large current discharge demand.

[0043] In one embodiment, the first voltage conversion module 211 includes a Buck module; the second voltage conversion module includes an LDO module. As an example, the first voltage conversion module 211 includes a Buck module to improve discharge efficiency and meet large current discharge requirements. As an example, the second voltage conversion module 213 includes an LDO module, specifically, the logic output module 2132 in the above embodiment includes an LDO module, which provides a stable target voltage to the load connection terminal when the load connection terminal is connected to a load device, and drives the first voltage conversion module 211 to enter a working state. When the load connection terminal is not connected to a load device, the standby power consumption is reduced.

[0044] This embodiment provides a battery management chip 2 including the above-mentioned discharge control circuit 21 .

[0045] In one embodiment, the battery management chip 2 further includes a charging control circuit 22 ; the charging control circuit 22 is used to connect the battery 1 and a load connection terminal, and is used to control the charging of the battery 1 .

[0046] This embodiment provides a battery management system, including a battery 1 and the above-mentioned battery management chip 2. The battery and the battery management chip 2 are connected.

[0047] This embodiment provides a battery module, including the above-mentioned battery management system.

[0048] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A discharge control circuit, characterized in that: It includes a first voltage conversion module, a load detection module and a second voltage conversion module; The first voltage conversion module is used to connect the battery and the load connection terminal, and to provide a first output voltage to the load connection terminal; The load detection module is connected to the first voltage conversion module and the second voltage conversion module, and is used to drive the first voltage conversion module into a non-working state and drive the second voltage conversion module into a working state when the load current output by the load connection end is less than a preset current threshold; The second voltage conversion module is connected to the first voltage conversion module, and is used to connect the battery and the load connection terminal, and is used to provide a target voltage to the load connection terminal when the load connection terminal is connected to a load device, and drive the first voltage conversion module to enter a working state.

2. The discharge control circuit according to claim 1, characterized in that: The second voltage conversion module includes a voltage comparison module and a logic output module; The voltage comparison module is connected to the load detection module, the load connection terminal and the first voltage conversion module, and is used to output a first comparison signal when the measured voltage output from the load connection terminal is less than a first voltage threshold; output a second comparison signal when the measured voltage is less than a second voltage threshold; the second voltage threshold is less than the first voltage threshold; the second comparison signal is used to drive the second voltage conversion module to enter a working state; The logic output module is connected to the voltage comparison module and the load connection terminal, and is used to provide a target voltage to the load connection terminal according to the first comparison signal or the second comparison signal.

3. The discharge control circuit according to claim 2, characterized in that: The difference between the second voltage threshold and the first voltage threshold ranges from 95 mV to 105 mV.

4. The discharge control circuit according to claim 2, characterized in that: The second voltage conversion module also includes a reference voltage module, which is connected to the voltage comparison module and is used to provide a first reference voltage corresponding to the first voltage threshold and a second reference voltage corresponding to the second voltage threshold to the voltage comparison module.

5. The discharge control circuit according to claim 4, characterized in that: The voltage comparison module includes a first comparator and a second comparator; The first input terminal of the first comparator is connected to the reference voltage module, the second input terminal of the first comparator is connected to the load connection terminal, the enable terminal of the first comparator is connected to the load detection module, and the output terminal of the first comparator is connected to the logic output module; The first input terminal of the second comparator is connected to the reference voltage module, the second input terminal of the second comparator is connected to the load connection terminal, the enable terminal of the second comparator is connected to the output terminal of the first comparator, and the output terminal of the second comparator is connected to the logic output module and the first voltage conversion module.

6. The discharge control circuit according to claim 1, characterized in that: The first voltage conversion module includes a Buck module; the second voltage conversion module includes an LDO module.

7. A battery management chip, characterized in that: The method comprises the discharge control circuit as claimed in any one of claims 1 to 6.

8. The battery management chip as claimed in claim 7, characterized in that: The battery management chip also includes a charging control circuit; the charging control circuit is used to connect the battery and the load connection terminal, and is used to control the charging of the battery.

9. A battery management system, characterized in that: It comprises a battery and a battery management chip as claimed in claim 7 or 8; the battery is connected to the battery management chip.

10. A battery module, characterized in that: Comprising the battery management system as claimed in claim 9.

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