Battery pack for electric tool and electric tool

Abstract

The utility model provides a battery pack for an electric tool and the electric tool. The battery pack comprises a battery cell group; the USB interface is connected with charging equipment or electric equipment in a removable manner; the buck-boost module is used for carrying out boost or buck processing on the voltage; the analog front-end module is electrically connected with the battery cell group and is used for acquiring electrical parameters of the battery cell group and sending the electrical parameters to the micro-control module; the fast charging protocol control module is electrically connected with the micro-control module and the buck-boost module, and is used for acquiring equipment parameters of charging equipment or electric equipment accessed by the USB interface and controlling the charging equipment or the electric equipment to be charged according to the equipment parameters and the electric parameters received from the micro-control module; and the boost-buck module is controlled to control charging and discharging at the USB interface. According to the scheme of the utility model, the universality and flexibility of the battery pack are improved, the battery pack can meet chargers and electric appliances with different voltages, and different application scenes are enriched.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack for an electric tool and an electric tool. Background Art

[0002] In the field of electronic devices and portable devices, battery packs are the core components necessary for power supply, and the performance and adaptability of battery packs are often limited by their circuit design. Traditional battery pack products can usually only achieve fixed input and output voltage conversion, which leads to their lack of flexibility in different electronic devices and applications.

[0003] Therefore, battery pack products can use buck-boost circuits to achieve buck-boost functions to meet the input and output specifications of different electronic equipment interfaces and the specification parameters of different battery cells, as well as to meet the voltage requirements of different chargers and electrical appliances. For different battery voltage platforms, the use of an overall buck-boost circuit may cause partial circuit redundancy and increase unnecessary costs. Therefore, existing battery pack products need to be designed for different battery platforms to provide flexible voltage adaptability. Utility Model Content

[0004] In view of this, the embodiments of the present application are committed to providing a battery pack and an electric tool for an electric tool, so as to provide flexible voltage adaptability while ensuring rationality and safety, so as to meet the input and output specification parameter requirements of different battery cells, and cope with the voltage requirements of different chargers and electrical appliances.

[0005] According to a first aspect of the utility model, there is provided a battery pack for an electric tool, comprising:

[0006] Battery cell group;

[0007] USB interface, used for removably connecting a charging device or a power-consuming device;

[0008] Buck-boost module, used to step up or step down the voltage;

[0009] An analog front-end module, electrically connected to the battery cell group, and used to obtain electrical parameters of the battery cell group;

[0010] The fast charging protocol control module is electrically connected to the microcontroller module and the buck-boost module, and is used to obtain the device parameters of the charging device or the power-consuming device connected to the USB interface, and control the buck-boost module according to the device parameters and the electrical parameters to control the charging and discharging at the USB interface.

[0011] Optionally, the buck-boost module includes at least one of a bidirectional buck-boost circuit, a unidirectional boost circuit, a unidirectional buck circuit and a unidirectional buck-boost circuit.

[0012] Optionally, the battery pack also includes a driving circuit, which is electrically connected to the fast charging protocol control module and is used to receive a buck-boost driving signal output by the fast charging protocol control module to control the buck-boost module to perform boost or buck processing.

[0013] Optionally, the fast charge protocol control module is further used to, in response to a judgment result that the input voltage of the USB interface is higher than the real-time voltage of the battery pack, control the drive circuit to drive the buck-boost module to step down the input voltage of the USB interface and then charge the battery pack; or,

[0014] The fast charge protocol control module controls the drive circuit to drive the buck-boost module to boost the input voltage of the USB interface and then charge the battery pack in response to the judgment result that the input voltage of the USB interface is lower than the real-time voltage of the battery pack; or,

[0015] In response to the judgment result that the required output voltage of the USB interface is higher than the real-time voltage of the battery pack, the fast charge protocol control module controls the drive circuit to drive the buck-boost circuit to boost the voltage of the battery pack and output it to the USB interface; or,

[0016] In response to the judgment result that the required output voltage of the USB interface is lower than the real-time voltage of the battery cell group, the fast charging protocol control module controls the drive circuit to drive the buck-boost circuit to step down the voltage of the battery cell group and output it to the USB interface.

[0017] Optionally, the bidirectional buck-boost circuit is an H-bridge buck-boost circuit.

[0018] Optionally, the battery pack further includes:

[0019] A first filtering circuit, a first current sampling circuit, a second filtering circuit, and a second current sampling circuit;

[0020] The first filter circuit is used to filter the input current or output current at the USB interface, and the second filter circuit is used to filter the input current or output current of the battery pack;

[0021] The first current sampling circuit is used to sample the input current or output current of the USB interface;

[0022] The second current sampling circuit is used to sample the input current or output current of the battery cell group.

[0023] Optionally, the battery pack further comprises: a first switch and a second switch;

[0024] The first switch is electrically connected to the USB interface and the fast charging protocol control module, and the fast charging protocol control module controls the on-off of the first switch to control the on-off of the electrical path from the USB interface to the buck-boost module;

[0025] The second switch is electrically connected to the battery cell group and the micro-control module, and the micro-control module controls the on-off of the second switch to control the on-off of the electrical path from the battery cell group to the buck-boost module.

[0026] Optionally, the battery pack further comprises a tool interface, wherein the tool interface is used to be connected to an electric tool so that the battery cell pack provides power to the tool, or to be connected to an electric tool charger so that the battery cell pack is charged by the electric tool charger.

[0027] Optionally, the microcontrol module is also used to determine whether there is any abnormality in the working status of the USB interface and / or the tool interface based on the device parameters and the electrical parameters, and when it is determined that there is an abnormality, control the disconnection of at least one electrical path from the battery pack to the USB interface and the tool interface.

[0028] In particular, the utility model also provides an electric tool, comprising the battery pack as described above.

[0029] According to the solution of the utility model, the electrical parameters of the battery cell group are obtained through the analog front-end module, and the device parameters of the charging device or the power-consuming device connected to the USB interface are obtained by the fast charging protocol control module. Therefore, the buck-boost module can be controlled according to the device parameters and / or electrical parameters to adjust the charging and discharging parameters, and then the charging and discharging at the USB interface can be controlled, so as to achieve the use effect of matching the battery pack with multi-voltage platform devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic principle block diagram of a battery pack for an electric tool according to an embodiment of the utility model is shown;

[0031] Figure 2 A schematic diagram of a bidirectional buck-boost circuit according to an embodiment of the utility model is shown;

[0032] Figure 3 A schematic principle block diagram of a battery pack using a unidirectional boost circuit for boosting and a unidirectional buck circuit for bucking according to an embodiment of the utility model is shown;

[0033] Figure 4 A schematic principle block diagram of a battery pack using a unidirectional buck-boost circuit for buck-boost according to an embodiment of the utility model is shown;

[0034] Figure 5A schematic principle block diagram of a battery pack using a boost circuit to increase or decrease voltage according to an embodiment of the utility model is shown;

[0035] Figure 6 A schematic principle block diagram of a battery pack using a unidirectional buck-boost circuit and a buck circuit for buck-boost according to an embodiment of the utility model is shown;

[0036] Figure 7 A schematic principle block diagram of a battery pack using a unidirectional buck-boost circuit and a boost circuit for buck-boost according to an embodiment of the utility model is shown;

[0037] Figure 8 A schematic principle block diagram of a battery pack using a direct charging circuit and a voltage reduction circuit according to an embodiment of the utility model is shown;

[0038] Fig. 9 A schematic principle block diagram of a battery pack using a direct charging circuit and a unidirectional buck-boost circuit for buck-boost according to an embodiment of the utility model is shown;

[0039] Fig.10 A schematic principle block diagram of a battery pack that uses a direct charging circuit and a unidirectional boost circuit to boost or reduce voltage according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0041] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0042] In addition, in order to better illustrate the utility model, numerous specific details are given in the specific embodiments below. It should be understood by those skilled in the art that the utility model can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present disclosure.

[0043] It should be understood that the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article indicates that the associated objects before and after are in an "or" relationship.

[0044] The "multiple" in the embodiments of the present invention refers to two or more. The first, second, etc. descriptions in the embodiments of the present invention are only used for illustration and distinction of the described objects, and have no order, nor do they represent a special limitation on the number in the embodiments of the present invention, and cannot constitute any limitation on the embodiments of the present invention.

[0045] The utility model provides an electric tool, comprising a battery pack. Figure 1 FIG. 1 shows a schematic block diagram of a battery pack for an electric tool according to an embodiment of the utility model. Figure 1 As shown, the battery pack includes a cell group, a USB interface, a buck-boost module, an analog front-end module and a fast charge protocol control module. The USB interface is removably connected to a charging device or a power-consuming device. The USB interface may be, for example, a Type-C interface, and the buck-boost module is used to boost or buck the input or output voltage of the Type-C interface. The analog front-end module is electrically connected to the cell group, and is used to obtain the electrical parameters of the cell group and send them to the microcontroller module. The fast charge protocol control module is configured to be electrically connected to the microcontroller module and the buck-boost module, and is used to obtain the device parameters of the charging device or power-consuming device connected to the USB interface, and control the buck-boost module according to the device parameters and the electrical parameters received from the microcontroller module to control the charging and discharging at the USB interface.

[0046] The analog front-end module, microcontroller module and fast charging protocol control module can be integrated into one chip, or they can be independent modules, or any two of them can be integrated into one chip. The specific selection can be made according to the actual situation and is not specifically limited here.

[0047] The battery pack also includes a main circuit switch, a first filter circuit, a second filter circuit, a first current sampling circuit, a second current sampling circuit and a third current sampling circuit, and the main circuit switch includes a first switch and a second switch. The first switch may be, for example, a VBUS switch, the first switch is electrically connected to the USB interface, and is electrically connected to the fast charge protocol control module. The second switch may be, for example, a low power switch, the second switch is electrically connected to the battery pack, and is electrically connected to the microcontroller module. The two ends of the first current sampling circuit are respectively connected to the first filter circuit and the buck-boost module, for sampling the input current or output current of the USB interface. The two ends of the second current sampling circuit are respectively connected to the second filter circuit and the buck-boost module, for sampling the input current or output current of the battery cell group. The third current sampling circuit is configured to be connected to the USB interface and the fast charge protocol control module. The first filter circuit is used to filter the input current or output current of the USB interface, and the second filter circuit is used to filter the input current or output current of the battery cell group.

[0048] The first filtering circuit, the second filtering circuit, the first current sampling circuit, the second current sampling circuit and the third current sampling circuit can all operate bidirectionally.

[0049] It can be understood that the USB interface can be used as a charging interface or as a discharging interface. When the USB is a charging interface, the current flowing through the USB interface is the input current, and when the USB is a discharging interface, the current flowing through the USB interface is the output current. Therefore, the first filter circuit and the first current sampling circuit can filter and sample the input current or output current flowing through the USB interface based on the actual usage scenario of the USB interface. Similarly, the second filter circuit and the second current sampling circuit on the battery cell group side can also filter and sample the input current or output current of the battery cell group based on the actual charging and discharging scenario of the battery cell group.

[0050] In addition to filtering out high and low frequency interference bands, the first filter circuit and the second filter circuit can also play the role of energy storage and voltage stabilization to prevent the input or output current / voltage from being too large due to external equipment connection, causing abnormalities in the internal circuit or damage to the device.

[0051] In one embodiment, the battery pack further includes a tool interface, which is used to be connected to an electric tool so that the battery pack provides power to the electric tool, or to be connected to an electric tool charger so that the battery pack is charged by the electric tool charger.

[0052] In one embodiment, the fast charging protocol control module is also used to determine whether there is any abnormality in the working status of the USB interface and / or the tool interface based on the device parameters and electrical parameters at the USB interface and / or the tool interface, and when it is determined that there is an abnormality, control the disconnection of at least one electrical path from the battery cell group to the USB interface and the tool interface.

[0053] like Figure 1 As shown, when a device is connected to the USB interface, the fast charge protocol control module shakes hands with the device to establish communication, determines whether the device is a charging device or an electrical device, and obtains device parameters, which include device type, charging voltage, discharge voltage, power, current, temperature, etc. The fast charge protocol control module compares the device parameters connected to the USB interface with the electrical parameters and / or pre-stored electrical parameters of the battery pack, and controls the buck-boost module to perform buck-boost control according to the judgment result to achieve charging and discharging. The pre-stored electrical parameters of the battery pack can be pre-stored in the micro-control module or the fast charge protocol control module. The electrical parameters of the battery pack are detected by the analog front-end module and transmitted to the micro-control module, and then transmitted to the fast charge protocol control module. In another embodiment, the comparison process of comparing the device parameters with the electrical parameters and / or pre-stored electrical parameters of the battery pack can also be performed in the micro-control module. In this case, the fast charge protocol control module transmits the device parameters of the connected device to the micro-control module, and after processing by the micro-control module, the results are fed back to the fast charge protocol control module, and then the fast charge protocol control module controls the buck-boost module to perform buck-boost.

[0054] In another embodiment, at least two of the analog front-end module, the fast charging protocol control module and the micro-control module are integrated into one chip. Taking the integration of the analog front-end module and the fast charging protocol control module as an example, the pre-stored electrical parameters of the battery pack can be pre-stored in this integrated chip, and this integrated chip then communicates with the fast charging protocol control module to transmit data and control instructions. In particular, if the analog front-end module, the fast charging protocol control module and the micro-control module are integrated into the same chip, the chip can directly complete multiple operations such as detecting the battery cell parameters of the battery pack, comparing with the pre-stored electrical parameters, and generating control instructions.

[0055] The overall logic of the step-up and step-down control in the utility model is as follows: if the device connected to the USB interface is a charging device, when the input voltage of the charging device is lower than the real-time voltage of the battery group, it is stepped up for charging; when the input voltage of the charging device is higher than the real-time voltage of the battery group, it is stepped down for charging; when the input voltage is the same as the real-time voltage of the battery group, it is directly charged. If the device connected to the USB interface is an electric device, when the required power supply voltage of the electric device is higher than the real-time voltage of the battery group, it is stepped up for discharge; when the required power supply voltage of the electric device is lower than the real-time voltage of the battery group, it is stepped down for discharge; when the required power supply voltage of the electric device is equal to the real-time voltage of the battery group, it is directly discharged.

[0056] According to the solution of the utility model, the electrical parameters of the battery cell group are obtained through the analog front-end module, and the device parameters of the charging device or the power-consuming device connected to the USB interface are obtained by the fast charging protocol control module, so that the buck-boost module can be controlled according to the device parameters and / or electrical parameters, and then the charge and discharge parameters are adjusted to control the charge and discharge at the USB interface, so that the battery pack can be matched with multi-voltage platform devices.

[0057] The buck-boost module includes at least one of a bidirectional buck-boost circuit, a unidirectional boost circuit, a unidirectional buck circuit and a unidirectional buck-boost circuit. The cost of a bidirectional buck-boost circuit is higher than that of a unidirectional boost circuit, a unidirectional buck circuit or a unidirectional buck-boost circuit. Therefore, in order to reduce the cost, only a unidirectional boost circuit, a unidirectional buck circuit or a unidirectional buck-boost circuit can be separately provided based on actual needs.

[0058] The battery pack also includes a drive circuit, which is electrically connected to the fast charge protocol control module and is used to receive the buck-boost drive signal output by the fast charge protocol control module to control the buck-boost module to perform a boost or buck process. Specifically, when the fast charge protocol control module determines that the input voltage of the USB interface is higher than the real-time voltage of the battery cell group, it generates a buck drive signal, the drive circuit receives the buck drive signal, and controls the buck-boost module to buck the input voltage of the USB interface and then charge the battery cell group. Alternatively, when the fast charge protocol control module determines that the input voltage of the USB interface is lower than the real-time voltage of the battery cell group, it generates a boost drive signal, the drive circuit receives the boost drive signal, and controls the buck-boost module to boost the input voltage of the USB interface and then charge the battery cell group. Alternatively, when the fast charge protocol control module determines that the required output voltage of the USB interface is higher than the real-time voltage of the battery cell group, it generates a boost drive signal, the drive circuit receives the boost drive signal, and controls the buck-boost module to boost the voltage of the battery cell group and then output it to the USB interface. Alternatively, when the fast charging protocol control module determines that the required output voltage of the USB interface is lower than the real-time voltage of the battery group, it generates a step-down drive signal, the drive circuit receives the step-down drive signal, and controls the step-up and step-down module to step down the voltage of the battery group and then charge the battery group.

[0059] The following is a detailed description with reference to specific embodiments.

[0060] Figure 2 FIG. 1 shows a schematic diagram of a bidirectional buck-boost circuit according to an embodiment of the utility model. Figure 2As shown, the bidirectional buck-boost circuit is an H-bridge buck-boost circuit. The H-bridge buck-boost circuit includes 4 MOS tubes, and the drive circuit controls the on and off of the 4 MOS tubes to achieve voltage up and down control. The charging process is input from the USB interface, and the battery pack is charged in the direction of the charging current. The discharge process is output to the USB interface, and the power is supplied to the electrical device in the direction of the discharge current. During charging, according to the real-time voltage relationship between the input voltage at the USB interface and the battery pack, and during discharging, according to the output voltage and the voltage relationship of the battery, the drive circuit controls the conduction or disconnection of different MOS tubes Q1 to Q4 of the H-bridge to determine whether to enter the boost state or the buck state. Among them, one IC controls four MOS tubes, which can realize buck-boost charging and buck-boost discharging.

[0061] Since the input voltage or output voltage is different from the actual voltage of the battery cell group, this bidirectional buck-boost circuit can be used when the input voltage is 5V, 9V, 12V, 15V, 20V, 3.3V-21V and the output voltage is one or more of 5V, 9V, 12V, 15V, 20V, 3.3V-21V.

[0062] See also Figure 1 When the fast charging protocol control module detects a device connected to the USB interface, it shakes hands with the connected device to establish communication, obtains various parameters of the connected device, and determines the type of the connected device. If it is a charging device, it performs charging, and if it is a power-consuming device, it performs discharging.

[0063] If the USB interface is connected to a charging device, the fast charging protocol control module compares the input charging voltage value of the connected device with the real-time voltage of the battery cell group. If the fast charging protocol control module determines that the input charging voltage value of the connected device is higher than the real-time voltage of the battery cell group, the buck-boost module is controlled to perform a step-down operation on the voltage of the connected device and then charge the battery cell group. If the fast charging protocol control module determines that the input charging voltage value of the connected device is lower than the real-time voltage, the buck-boost module is controlled to perform a step-up operation on the voltage of the connected device and then charge the battery cell group. If the USB interface is connected to an electrical device, correspondingly, the fast charging protocol control module compares the required voltage of the connected device with the real-time voltage of the battery cell group. If the fast charging protocol control module determines that the required output voltage value of the electrical device is higher than the real-time voltage, the buck-boost module is controlled to perform a step-down operation on the voltage of the battery cell group and then discharge it to the connected device. If the fast charging protocol control module determines that the required output voltage value of the electrical device is lower than the real-time voltage, the buck-boost module is controlled to perform a step-down operation on the voltage of the battery cell group and then discharge it to the connected device. In this case, all voltage step-ups and step-downs are completed by a bidirectional buck-boost circuit. That is, the buck-boost module is a bidirectional buck-boost circuit.

[0064] In one embodiment, the buck-boost module is a unidirectional buck circuit, which is usually a half-bridge circuit, including two MOS tubes. The voltage is also controlled by the drive circuit to control the on and off of the MOS tube. If a unidirectional buck circuit is set in the charging circuit, when the input voltage of the charging device connected to the USB interface is higher than the voltage of the battery group, the unidirectional buck circuit is used to step down the USB input voltage and charge the battery group. Alternatively, if a unidirectional buck circuit is set in the discharge circuit, when the voltage of the battery group is higher than the output voltage of the USB interface, the voltage of the battery group is stepped down by the unidirectional buck circuit and output to the electrical device at the USB interface. The unidirectional buck circuit is usually equipped with two MOS tubes, and the fast charging protocol control module outputs a control signal to the drive circuit, and the drive circuit outputs different drive signals to drive the on and off of the two MOS tubes, so that the input voltage of the buck circuit is stepped down and output.

[0065] In one embodiment, the buck-boost module is a unidirectional boost circuit. The difference between this embodiment and the aforementioned embodiment is that the buck-boost module in this embodiment is different. If a unidirectional boost circuit is provided in the charging circuit, when the input voltage of the charging device at the USB interface is lower than the real-time voltage of the battery cell group, a unidirectional boost circuit is used to boost the input voltage of the USB interface and then charge the battery pack. Alternatively, if a unidirectional boost circuit is provided in the discharge circuit, when the real-time output voltage of the battery cell group is lower than the voltage required by the electrical device at the USB interface, a unidirectional boost circuit is used to boost the output voltage of the battery cell group and then discharge it to the electrical device. The fast charge protocol control module outputs a control signal to the drive circuit, and the drive circuit outputs a drive signal to drive the on and off of the MOS tube, thereby boosting the input voltage of the unidirectional boost circuit and outputting it.

[0066] In one embodiment, a direct charging circuit can also be used. When the input voltage of the charging device is higher than the real-time voltage of the battery pack, and the charging device or the fast charging protocol control module can support at least one of the modes of PPS (Programmable Power Supply) or AVS (Adjustable Voltage Supply) (the gradient voltage regulation function of the PD3.1 protocol), the charging device or the fast charging protocol control module will perform a step-down conversion and then directly charge the battery pack through the direct charging circuit. Different from the conversion of a specific voltage value, the PPS or AVS mode can convert V in The voltage is gradually stepped down to the target voltage from V out The output voltage can meet various requirements, so as to realize the function of charging the battery pack through direct charging mode.

[0067] Figure 3 The schematic principle block diagram of a battery pack using a unidirectional boost circuit for boosting and a unidirectional buck circuit for bucking according to an embodiment of the utility model is shown. Figure 3 As shown, when charging, the charging voltage of the charging device connected to the USB interface is higher than the high voltage allowed for charging of the battery pack, and a boost circuit is not required, and only a step-down circuit is required, wherein the high voltage allowed for charging of the battery pack refers to the highest voltage allowed for the battery pack during the charging process. Exceeding this voltage may cause the battery pack to be overcharged, resulting in performance degradation or even safety risks of the battery pack. When discharging, the allowable discharge low voltage of the battery pack is higher than the required output voltage of the electrical device connected to the USB interface, and a boost circuit is not required, and only a step-down circuit is required, wherein the allowable discharge low voltage refers to the lowest voltage to which the battery pack can be safely discharged during use. If it is lower than this value, the battery pack may experience performance degradation or even permanent damage. Vice versa, when charging, the charging voltage of the charging device connected to the USB interface is lower than the allowable charging low voltage of the battery pack, and a step-down circuit is not required, and only a boost circuit is required, wherein the allowable charging low voltage of the battery pack refers to the lowest voltage to which the battery pack can be safely charged during the charging process. Continuing to charge below the allowable charging low voltage may cause unstable battery voltage, abnormal charging current, and even permanent damage to the battery. During discharge, the allowable discharge high voltage of the battery pack is lower than the required output voltage of the electrical device connected to the USB interface, so there is no need for a step-down circuit, and only a step-up circuit is needed. The allowable discharge high voltage of the battery pack is the highest voltage that the battery pack can safely discharge within the normal use range. This value is the highest voltage that the battery pack can reach under normal operation. Exceeding this value may affect the life or performance of the battery pack. The step-up circuit is a unidirectional step-up circuit, and the step-down circuit is a unidirectional step-down circuit.

[0068] For example, when the input voltage is less than 10V and the output voltage is less than 16V, the above discrete solution may be used instead of using a complete bidirectional charging and discharging circuit.

[0069] Figure 4 FIG. 2 shows a schematic principle block diagram of a battery pack using a unidirectional buck-boost circuit to boost voltage and a unidirectional boost circuit to boost voltage according to another embodiment of the utility model. The difference between this embodiment and the previous embodiment is that the buck-boost module in this embodiment is different. Figure 4 As shown, when charging, the charging voltage of the charging device connected to the USB interface is lower than the allowable charging low voltage of the battery pack, or the charging voltage is higher than the allowable charging high voltage of the battery pack, the voltage and current pass through the first switch, and the voltage is stepped up or stepped down by the buck-boost circuit to reach the allowable charging voltage range of the battery pack, and the battery pack is charged by adjusting the protocol voltage and current. When discharging, if the allowable discharge low voltage of the battery pack is higher than the required output voltage of the electrical device connected to the USB interface, a unidirectional buck-boost circuit is used to step down the voltage; if the allowable discharge high voltage of the battery pack is lower than the required output voltage of the electrical device connected to the USB interface, a unidirectional buck-boost circuit is used to step up the voltage.

[0070] For example, the above discrete solution can be used when the input voltage is less than 10V or the input voltage is greater than 21V, and the output voltage is greater than 16V and <21V.

[0071] Figure 5 The schematic principle block diagram of a battery pack using a bidirectional boost circuit to boost voltage according to an embodiment of the utility model is shown. The difference between this embodiment and the previous embodiment is that the boost and buck modules in this embodiment are different. Figure 5 When charging, the charging device is plugged into the USB interface. If the charging voltage of the charging device is lower than the allowable charging low voltage of the battery pack, the battery pack must be boosted to charge the battery pack. The voltage and current pass through the first switch and are boosted by the boost circuit to reach the allowable charging voltage range of the battery pack. The battery pack is charged by adjusting the output protocol voltage and current of the boost circuit. When discharging, the electrical device is plugged into the USB interface. If the allowable discharge high voltage of the battery pack is lower than the required output voltage of the electrical device connected to the USB interface, the boost circuit is used to boost the voltage to reach the discharge voltage of the USB interface, and then the electrical device is discharged by adjusting the output protocol voltage and current of the boost circuit.

[0072] For example, when the input voltage is less than 10V and the output voltage is greater than 21V or greater than 28V, the above discrete solution can be used. The battery cell group must be boosted to output the required voltage value.

[0073] Figure 6 FIG. 2 shows a schematic principle block diagram of a battery pack using a unidirectional buck-boost circuit for bucking and a buck circuit for bucking according to another embodiment of the utility model. The difference between this embodiment and the previous embodiment is that the buck-boost module in this embodiment is different. Figure 6 As shown, for example, when the input voltage is greater than 10V or greater than 20V and the output voltage is less than 16V, a discrete solution can be used. The principle is similar. When the charging voltage of the charging device is between the allowable charging low voltage and high voltage of the battery pack, and the power supply voltage required by the power-consuming device is lower than the allowable discharge low voltage of the battery pack, the boost-boost charging and the buck-boost discharge are used.

[0074] See also Figure 6 When charging, a unidirectional buck-boost circuit is used. When the real-time voltage of the battery pack is less than the input (charging) voltage, the unidirectional buck-boost circuit is used to step down and charge. When the real-time voltage of the battery pack is greater than the input (charging) voltage, the unidirectional buck-boost circuit is used to step up and charge the battery pack. When discharging, the USB output voltage is required to be lower than the allowable discharge voltage of the battery pack, so only the voltage needs to be stepped down, so a buck circuit is used.

[0075] In another embodiment of the present invention, the buck-boost module is a bidirectional buck-boost circuit. The difference between this embodiment and the above embodiment is that the buck-boost module in this embodiment is different. Figure 1As shown, for example, this solution can be used when the input voltage is greater than 10V or greater than 20V, and the output voltage is greater than 16V or greater than 21V, and the charging voltage of the charging equipment is between the allowable charging low voltage and high voltage of the battery cell group, and the power supply voltage required by the electrical equipment is also between the allowable discharge low voltage and high voltage of the battery cell group, and the boost-boost charging and boost-boost discharging use a bidirectional boost-boost circuit.

[0076] See also Figure 1 When charging, the analog front-end module detects the real-time voltage of the battery pack. When the charging voltage of the charging device is greater than the real-time voltage of the battery pack, a bidirectional buck-boost circuit is used to step down the charging voltage of the charging device for charging. When the charging voltage of the charging device is less than the real-time voltage of the battery pack, a bidirectional buck-boost circuit is used to step up the voltage to charge the battery pack. When discharging, the analog front-end module detects the real-time voltage of the battery pack. When the real-time voltage of the battery pack is higher than the required output voltage of the power-consuming device, a bidirectional buck-boost circuit is used to step down the voltage of the battery pack for discharge. When the real-time voltage of the battery pack is lower than the required output voltage of the power-consuming device, a bidirectional buck-boost circuit is used to step up the voltage of the battery pack for discharge.

[0077] Figure 7 The schematic principle block diagram of a battery pack using a unidirectional buck-boost circuit for buck-boost and a boost circuit for boosting according to an embodiment of the utility model is shown. The difference between this embodiment and the above-mentioned embodiment is that the buck-boost module in this embodiment is different. Figure 7 As shown, for example, when the input voltage is greater than 10V or greater than 21V, and the output voltage is greater than 21V or greater than 28V, a discrete solution can be used. When the charging voltage of the charging device is between the allowable charging low voltage and high voltage of the battery pack, and the power supply voltage required by the power-consuming device is greater than the allowable discharge high voltage of the battery pack, buck-boost charging and boost discharge are performed.

[0078] See also Figure 7 When charging, the analog front-end module detects the real-time voltage of the battery pack. When the charging voltage of the charging device is greater than the real-time voltage of the battery pack, a unidirectional buck-boost circuit is used to step down the charging voltage of the charging device for charging. When the charging voltage of the charging device is less than the real-time voltage of the battery pack, a unidirectional buck-boost circuit is used to boost the voltage to charge the battery pack. When discharging, if the output voltage is higher than the high voltage allowed by the battery pack, the boost circuit is used to discharge directly.

[0079] Figure 8 The schematic principle block diagram of a battery pack using a direct charging circuit and a step-down circuit for stepping down the voltage according to an embodiment of the utility model is shown. The difference between this embodiment and the above-mentioned embodiment is that the step-up and step-down modules in this embodiment are different. Figure 8As shown, when the input voltage is greater than 21V and greater than 28V, and the output voltage is less than 16V, a discrete solution can be adopted. When the charging voltage of the charging equipment is higher than the allowable charging high voltage of the battery group, and the power supply voltage required by the electrical equipment is lower than the allowable discharge low voltage of the battery group, the voltage is reduced for charging and the voltage is reduced for discharging.

[0080] See also Figure 8 When charging, direct charging, input charging uses the AVS mode of PD3.1, which can be directly charged by the charging device or the fast charging protocol module. When directly charging, the buck circuit is integrated into the charging device, or integrated into the control chip of the fast charging protocol control module, and the direct charging circuit in the battery pack is equipped with a charging MOS for on-off control. When discharging, the buck discharge can be combined with an adjustable buck circuit according to the PPS mode of PD3.0, which is the most cost-effective.

[0081] Fig. 9 The schematic principle block diagram of a battery pack using a direct charging circuit and a unidirectional buck-boost circuit for buck-boost according to an embodiment of the utility model is shown. The difference between this embodiment and the previous embodiment is that the buck-boost module in this embodiment is different. Fig. 9 As shown, for example, when the input voltage is greater than 21V or greater than 28V, and the output voltage is greater than 16V or greater than 21V, a discrete solution can be used. When the charging voltage of the charging device is higher than the allowable charging high voltage of the battery pack, and the power supply voltage required by the power-consuming device is between the allowable discharge low voltage and high voltage of the battery pack, step-down charging and step-up / step-down discharge are performed.

[0082] See also Fig. 9 When charging, the voltage is stepped down for direct charging. The input charging adopts the AVS mode of PD3.1, which can be directly charged by the charging device or the fast charging protocol module. During direct charging, the step-down circuit is integrated into the charging device, or integrated into the control chip of the fast charging protocol control module. The direct charging circuit in the battery cell group is equipped with a charging MOS for on-off control. When discharging, a unidirectional step-up and step-down circuit is used to detect the real-time voltage of the battery cell group. When the real-time voltage of the battery cell group is higher than the output (discharge) voltage, the voltage is stepped down for discharge, and when it is lower than the output (discharge) voltage, the voltage is stepped up for discharge.

[0083] Fig.10 The schematic principle block diagram of a battery pack using a direct charging circuit and a unidirectional boost circuit for boosting and lowering voltage according to an embodiment of the utility model is shown. The difference between this embodiment and the above-mentioned embodiment is that the boost and lowering voltage module in this embodiment is different. Fig.10 As shown, the discrete solution can be used when the input voltage is greater than 21V or greater than 28V, and the output voltage is greater than 21V or greater than 28V. When the charging voltage of the charging device is higher than the allowable charging high voltage of the battery pack, and the power supply voltage required by the power-consuming device is higher than the allowable discharge high voltage of the battery pack, the step-down charging and step-up discharging are used.

[0084] See also Fig.10 , when charging, the voltage is stepped down and directly charged. The input charging adopts the AVS mode of PD3.1, which can be directly charged by the charging device. When directly charging, the step-down circuit is integrated in the charging device, and the direct charging circuit in the battery pack is equipped with a charging MOS for on-off control. When discharging, the voltage is stepped up and the output discharge adopts a unidirectional boost circuit.

[0085] The above embodiment is applied to a 5-string battery system, and the 5-string battery pack allows a charging voltage range of 10V-20.75V, and allows a discharge voltage range of 16V-20.75V. Of course, in practical applications, the actual number of strings, voltage, current, capacity, etc. of the battery pack can be customized based on individual needs. Therefore, the specific allowable charging voltage range and allowable discharge voltage range of the above embodiment can be adjusted by the user according to actual needs, and are not specifically limited here.

[0086] The scheme of the embodiment of the utility model can use a bidirectional buck-boost circuit to adjust the input and output according to the actual parameters of the battery cell group, as well as various charging device output parameters, load parameters of electrical equipment, etc., so as to achieve the effect of matching the battery pack with multi-voltage platform devices. In addition, in addition to the bidirectional buck-boost circuit (single integrated chip), a scheme for setting up other optional boost and / or buck circuits separately is provided, which can reduce costs to a certain extent. At the same time, the scheme refines the specific schemes for different voltage platforms. Therefore, the scheme of the utility model improves the versatility and flexibility of the power tool battery pack, can meet the needs of charging devices and electrical equipment with different voltages, enriches different application scenarios, and reduces costs.

[0087] The above is only a specific implementation of the present application, and any other improvements made based on the concept of the present application are deemed to be within the protection scope of the present application.

Claims

1. A battery pack for an electric tool, characterized in that: include: Battery cell group; USB interface, used for removably connecting a charging device or a power-consuming device; Buck-boost module, used to step up or step down the voltage; An analog front-end module, electrically connected to the battery cell group, and used to obtain electrical parameters of the battery cell group; The fast charging protocol control module is electrically connected to the microcontroller module and the buck-boost module, and is used to obtain the device parameters of the charging device or the power-consuming device connected to the USB interface, and control the buck-boost module according to the device parameters and the electrical parameters to control the charging and discharging at the USB interface.

2. The battery pack according to claim 1, characterized in that: The buck-boost module includes at least one of a bidirectional buck-boost circuit, a unidirectional boost circuit, a unidirectional buck circuit and a unidirectional buck-boost circuit.

3. The battery pack according to claim 1, characterized in that: The battery pack also includes a drive circuit, which is electrically connected to the fast charging protocol control module and is used to receive a buck-boost drive signal output by the fast charging protocol control module to control the buck-boost module to perform a boost or buck process.

4. The battery pack according to claim 3, characterized in that: The fast charge protocol control module is also used to, in response to a judgment result that the input voltage of the USB interface is higher than the real-time voltage of the battery pack, control the drive circuit to drive the buck-boost module to step down the input voltage of the USB interface and then charge the battery pack; or, The fast charge protocol control module controls the drive circuit to drive the buck-boost module to boost the input voltage of the USB interface and then charge the battery pack in response to the judgment result that the input voltage of the USB interface is lower than the real-time voltage of the battery pack; or, In response to the judgment result that the required output voltage of the USB interface is higher than the real-time voltage of the battery pack, the fast charge protocol control module controls the drive circuit to drive the buck-boost module to boost the voltage of the battery pack and output it to the USB interface; or, In response to the judgment result that the required output voltage of the USB interface is lower than the real-time voltage of the battery cell group, the fast charging protocol control module controls the driving circuit to drive the buck-boost module to step down the voltage of the battery cell group and output it to the USB interface.

5. The battery pack according to claim 2, characterized in that: The bidirectional buck-boost circuit is an H-bridge buck-boost circuit.

6. The battery pack according to claim 1, characterized in that: The battery pack further comprises: A first filtering circuit, a first current sampling circuit, a second filtering circuit, and a second current sampling circuit; The first filter circuit is used to filter the input current or output current at the USB interface, and the second filter circuit is used to filter the input current or output current of the battery pack; The first current sampling circuit is used to sample the input current or output current of the USB interface; The second current sampling circuit is used to sample the input current or output current of the battery cell group.

7. The battery pack according to claim 1, characterized in that: The battery pack further includes: a first switch and a second switch; The first switch is electrically connected to the USB interface and the fast charging protocol control module, and the fast charging protocol control module controls the on-off of the first switch to control the on-off of the electrical path from the USB interface to the buck-boost module; The second switch is electrically connected to the battery cell group and the micro-control module, and the micro-control module controls the on-off of the second switch to control the on-off of the electrical path from the battery cell group to the buck-boost module.

8. The battery pack according to any one of claims 1 to 7, characterized in that: It also includes a tool interface, which is used to connect to an electric tool so that the battery pack provides power to the tool, or to connect to an electric tool charger so that the battery pack is charged by the electric tool charger.

9. The battery pack according to claim 1, characterized in that: The microcontroller module is also used for: Determine whether there is any abnormality in the working status of the USB interface and / or the tool interface based on the device parameters and the electrical parameters, and when it is determined that there is an abnormality, control to disconnect at least one electrical path from the battery pack to the USB interface and the tool interface.

10. An electric tool, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 9.

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